Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Driver for 8250/16550-type serial ports |
| 3 | * |
| 4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
| 5 | * |
| 6 | * Copyright (C) 2001 Russell King. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * A note about mapbase / membase |
| 14 | * |
| 15 | * mapbase is the physical address of the IO port. |
| 16 | * membase is an 'ioremapped' cookie. |
| 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 20 | #define SUPPORT_SYSRQ |
| 21 | #endif |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/moduleparam.h> |
| 25 | #include <linux/ioport.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/console.h> |
| 28 | #include <linux/sysrq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/delay.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 30 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/tty.h> |
Daniel Drake | cd3ecad | 2010-10-20 16:00:48 -0700 | [diff] [blame] | 32 | #include <linux/ratelimit.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/tty_flip.h> |
| 34 | #include <linux/serial_reg.h> |
| 35 | #include <linux/serial_core.h> |
| 36 | #include <linux/serial.h> |
| 37 | #include <linux/serial_8250.h> |
Andrew Morton | 78512ec | 2005-11-07 00:59:13 -0800 | [diff] [blame] | 38 | #include <linux/nmi.h> |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 39 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Paul Gortmaker | 6816383 | 2012-02-09 18:48:19 -0500 | [diff] [blame] | 41 | #ifdef CONFIG_SPARC |
| 42 | #include <linux/sunserialcore.h> |
| 43 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #include <asm/io.h> |
| 46 | #include <asm/irq.h> |
| 47 | |
| 48 | #include "8250.h" |
| 49 | |
| 50 | /* |
| 51 | * Configuration: |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 52 | * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | * is unsafe when used on edge-triggered interrupts. |
| 54 | */ |
Adrian Bunk | 408b664 | 2005-05-01 08:59:29 -0700 | [diff] [blame] | 55 | static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Dave Jones | a61c2d7 | 2006-01-07 23:18:19 +0000 | [diff] [blame] | 57 | static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; |
| 58 | |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 59 | static struct uart_driver serial8250_reg; |
| 60 | |
| 61 | static int serial_index(struct uart_port *port) |
| 62 | { |
| 63 | return (serial8250_reg.minor - 64) + port->line; |
| 64 | } |
| 65 | |
Chuck Ebbert | d41a4b5 | 2009-10-01 15:44:26 -0700 | [diff] [blame] | 66 | static unsigned int skip_txen_test; /* force skip of txen test at init time */ |
| 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | /* |
| 69 | * Debugging. |
| 70 | */ |
| 71 | #if 0 |
| 72 | #define DEBUG_AUTOCONF(fmt...) printk(fmt) |
| 73 | #else |
| 74 | #define DEBUG_AUTOCONF(fmt...) do { } while (0) |
| 75 | #endif |
| 76 | |
| 77 | #if 0 |
| 78 | #define DEBUG_INTR(fmt...) printk(fmt) |
| 79 | #else |
| 80 | #define DEBUG_INTR(fmt...) do { } while (0) |
| 81 | #endif |
| 82 | |
Jiri Slaby | e7328ae | 2011-06-05 22:51:49 +0200 | [diff] [blame] | 83 | #define PASS_LIMIT 512 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Dick Hollenbeck | bca4761 | 2009-12-09 12:31:34 -0800 | [diff] [blame] | 85 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
| 86 | |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | #ifdef CONFIG_SERIAL_8250_DETECT_IRQ |
| 89 | #define CONFIG_SERIAL_DETECT_IRQ 1 |
| 90 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | #ifdef CONFIG_SERIAL_8250_MANY_PORTS |
| 92 | #define CONFIG_SERIAL_MANY_PORTS 1 |
| 93 | #endif |
| 94 | |
| 95 | /* |
| 96 | * HUB6 is always on. This will be removed once the header |
| 97 | * files have been cleaned. |
| 98 | */ |
| 99 | #define CONFIG_HUB6 1 |
| 100 | |
Bryan Wu | a4ed1e4 | 2008-05-31 16:10:04 +0800 | [diff] [blame] | 101 | #include <asm/serial.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | /* |
| 103 | * SERIAL_PORT_DFNS tells us about built-in ports that have no |
| 104 | * standard enumeration mechanism. Platforms that can find all |
| 105 | * serial ports via mechanisms like ACPI or PCI need not supply it. |
| 106 | */ |
| 107 | #ifndef SERIAL_PORT_DFNS |
| 108 | #define SERIAL_PORT_DFNS |
| 109 | #endif |
| 110 | |
Arjan van de Ven | cb3592b | 2005-11-28 21:04:11 +0000 | [diff] [blame] | 111 | static const struct old_serial_port old_serial_port[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | SERIAL_PORT_DFNS /* defined in asm/serial.h */ |
| 113 | }; |
| 114 | |
Russell King | 026d02a | 2005-06-29 18:45:19 +0100 | [diff] [blame] | 115 | #define UART_NR CONFIG_SERIAL_8250_NR_UARTS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
| 117 | #ifdef CONFIG_SERIAL_8250_RSA |
| 118 | |
| 119 | #define PORT_RSA_MAX 4 |
| 120 | static unsigned long probe_rsa[PORT_RSA_MAX]; |
| 121 | static unsigned int probe_rsa_count; |
| 122 | #endif /* CONFIG_SERIAL_8250_RSA */ |
| 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | struct irq_info { |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 125 | struct hlist_node node; |
| 126 | int irq; |
| 127 | spinlock_t lock; /* Protects list not the hash */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | struct list_head *head; |
| 129 | }; |
| 130 | |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 131 | #define NR_IRQ_HASH 32 /* Can be adjusted later */ |
| 132 | static struct hlist_head irq_lists[NR_IRQ_HASH]; |
| 133 | static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | /* |
| 136 | * Here we define the default xmit fifo size used for each type of UART. |
| 137 | */ |
| 138 | static const struct serial8250_config uart_config[] = { |
| 139 | [PORT_UNKNOWN] = { |
| 140 | .name = "unknown", |
| 141 | .fifo_size = 1, |
| 142 | .tx_loadsz = 1, |
| 143 | }, |
| 144 | [PORT_8250] = { |
| 145 | .name = "8250", |
| 146 | .fifo_size = 1, |
| 147 | .tx_loadsz = 1, |
| 148 | }, |
| 149 | [PORT_16450] = { |
| 150 | .name = "16450", |
| 151 | .fifo_size = 1, |
| 152 | .tx_loadsz = 1, |
| 153 | }, |
| 154 | [PORT_16550] = { |
| 155 | .name = "16550", |
| 156 | .fifo_size = 1, |
| 157 | .tx_loadsz = 1, |
| 158 | }, |
| 159 | [PORT_16550A] = { |
| 160 | .name = "16550A", |
| 161 | .fifo_size = 16, |
| 162 | .tx_loadsz = 16, |
| 163 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
| 164 | .flags = UART_CAP_FIFO, |
| 165 | }, |
| 166 | [PORT_CIRRUS] = { |
| 167 | .name = "Cirrus", |
| 168 | .fifo_size = 1, |
| 169 | .tx_loadsz = 1, |
| 170 | }, |
| 171 | [PORT_16650] = { |
| 172 | .name = "ST16650", |
| 173 | .fifo_size = 1, |
| 174 | .tx_loadsz = 1, |
| 175 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, |
| 176 | }, |
| 177 | [PORT_16650V2] = { |
| 178 | .name = "ST16650V2", |
| 179 | .fifo_size = 32, |
| 180 | .tx_loadsz = 16, |
| 181 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | |
| 182 | UART_FCR_T_TRIG_00, |
| 183 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, |
| 184 | }, |
| 185 | [PORT_16750] = { |
| 186 | .name = "TI16750", |
| 187 | .fifo_size = 64, |
| 188 | .tx_loadsz = 64, |
| 189 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 | |
| 190 | UART_FCR7_64BYTE, |
| 191 | .flags = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE, |
| 192 | }, |
| 193 | [PORT_STARTECH] = { |
| 194 | .name = "Startech", |
| 195 | .fifo_size = 1, |
| 196 | .tx_loadsz = 1, |
| 197 | }, |
| 198 | [PORT_16C950] = { |
| 199 | .name = "16C950/954", |
| 200 | .fifo_size = 128, |
| 201 | .tx_loadsz = 128, |
| 202 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
Pavel Machek | d0694e2 | 2011-01-09 08:38:48 +0100 | [diff] [blame] | 203 | /* UART_CAP_EFR breaks billionon CF bluetooth card. */ |
| 204 | .flags = UART_CAP_FIFO | UART_CAP_SLEEP, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | }, |
| 206 | [PORT_16654] = { |
| 207 | .name = "ST16654", |
| 208 | .fifo_size = 64, |
| 209 | .tx_loadsz = 32, |
| 210 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | |
| 211 | UART_FCR_T_TRIG_10, |
| 212 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, |
| 213 | }, |
| 214 | [PORT_16850] = { |
| 215 | .name = "XR16850", |
| 216 | .fifo_size = 128, |
| 217 | .tx_loadsz = 128, |
| 218 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
| 219 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, |
| 220 | }, |
| 221 | [PORT_RSA] = { |
| 222 | .name = "RSA", |
| 223 | .fifo_size = 2048, |
| 224 | .tx_loadsz = 2048, |
| 225 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11, |
| 226 | .flags = UART_CAP_FIFO, |
| 227 | }, |
| 228 | [PORT_NS16550A] = { |
| 229 | .name = "NS16550A", |
| 230 | .fifo_size = 16, |
| 231 | .tx_loadsz = 16, |
| 232 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
| 233 | .flags = UART_CAP_FIFO | UART_NATSEMI, |
| 234 | }, |
| 235 | [PORT_XSCALE] = { |
| 236 | .name = "XScale", |
| 237 | .fifo_size = 32, |
| 238 | .tx_loadsz = 32, |
| 239 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
Stephen Warren | 4539c24 | 2011-05-17 16:12:36 -0600 | [diff] [blame] | 240 | .flags = UART_CAP_FIFO | UART_CAP_UUE | UART_CAP_RTOIE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | }, |
David Daney | 6b06f19 | 2009-01-02 13:50:00 +0000 | [diff] [blame] | 242 | [PORT_OCTEON] = { |
| 243 | .name = "OCTEON", |
| 244 | .fifo_size = 64, |
| 245 | .tx_loadsz = 64, |
| 246 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
| 247 | .flags = UART_CAP_FIFO, |
| 248 | }, |
Florian Fainelli | 08e0992 | 2009-06-11 13:21:24 +0100 | [diff] [blame] | 249 | [PORT_AR7] = { |
| 250 | .name = "AR7", |
| 251 | .fifo_size = 16, |
| 252 | .tx_loadsz = 16, |
| 253 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00, |
| 254 | .flags = UART_CAP_FIFO | UART_CAP_AFE, |
| 255 | }, |
Philippe Langlais | 235dae5 | 2010-07-29 17:13:57 +0200 | [diff] [blame] | 256 | [PORT_U6_16550A] = { |
| 257 | .name = "U6_16550A", |
| 258 | .fifo_size = 64, |
| 259 | .tx_loadsz = 64, |
| 260 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
| 261 | .flags = UART_CAP_FIFO | UART_CAP_AFE, |
| 262 | }, |
Stephen Warren | 4539c24 | 2011-05-17 16:12:36 -0600 | [diff] [blame] | 263 | [PORT_TEGRA] = { |
| 264 | .name = "Tegra", |
| 265 | .fifo_size = 32, |
| 266 | .tx_loadsz = 8, |
| 267 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | |
| 268 | UART_FCR_T_TRIG_01, |
| 269 | .flags = UART_CAP_FIFO | UART_CAP_RTOIE, |
| 270 | }, |
Søren Holm | 0631534 | 2011-09-02 22:55:37 +0200 | [diff] [blame] | 271 | [PORT_XR17D15X] = { |
| 272 | .name = "XR17D15X", |
| 273 | .fifo_size = 64, |
| 274 | .tx_loadsz = 64, |
| 275 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
Matt Schulte | 81db077 | 2012-11-21 09:39:07 -0600 | [diff] [blame] | 276 | .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | |
| 277 | UART_CAP_SLEEP, |
Søren Holm | 0631534 | 2011-09-02 22:55:37 +0200 | [diff] [blame] | 278 | }, |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 279 | [PORT_XR17V35X] = { |
| 280 | .name = "XR17V35X", |
| 281 | .fifo_size = 256, |
| 282 | .tx_loadsz = 256, |
| 283 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11 | |
| 284 | UART_FCR_T_TRIG_11, |
| 285 | .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | |
| 286 | UART_CAP_SLEEP, |
| 287 | }, |
Roland Stigge | 7a51459 | 2012-06-11 21:57:13 +0200 | [diff] [blame] | 288 | [PORT_LPC3220] = { |
| 289 | .name = "LPC3220", |
| 290 | .fifo_size = 64, |
| 291 | .tx_loadsz = 32, |
| 292 | .fcr = UART_FCR_DMA_SELECT | UART_FCR_ENABLE_FIFO | |
| 293 | UART_FCR_R_TRIG_00 | UART_FCR_T_TRIG_00, |
| 294 | .flags = UART_CAP_FIFO, |
| 295 | }, |
Stephen Hurd | ebebd49 | 2013-01-17 14:14:53 -0800 | [diff] [blame] | 296 | [PORT_BRCM_TRUMANAGE] = { |
| 297 | .name = "TruManage", |
| 298 | .fifo_size = 1, |
| 299 | .tx_loadsz = 1024, |
| 300 | .flags = UART_CAP_HFIFO, |
| 301 | }, |
Sean Young | 65ecc9c | 2012-09-07 19:06:24 +0100 | [diff] [blame] | 302 | [PORT_8250_CIR] = { |
| 303 | .name = "CIR port" |
Ley Foon Tan | e06c93c | 2013-03-07 10:28:37 +0800 | [diff] [blame] | 304 | }, |
| 305 | [PORT_ALTR_16550_F32] = { |
| 306 | .name = "Altera 16550 FIFO32", |
| 307 | .fifo_size = 32, |
| 308 | .tx_loadsz = 32, |
| 309 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
| 310 | .flags = UART_CAP_FIFO | UART_CAP_AFE, |
| 311 | }, |
| 312 | [PORT_ALTR_16550_F64] = { |
| 313 | .name = "Altera 16550 FIFO64", |
| 314 | .fifo_size = 64, |
| 315 | .tx_loadsz = 64, |
| 316 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
| 317 | .flags = UART_CAP_FIFO | UART_CAP_AFE, |
| 318 | }, |
| 319 | [PORT_ALTR_16550_F128] = { |
| 320 | .name = "Altera 16550 FIFO128", |
| 321 | .fifo_size = 128, |
| 322 | .tx_loadsz = 128, |
| 323 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, |
| 324 | .flags = UART_CAP_FIFO | UART_CAP_AFE, |
| 325 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | }; |
| 327 | |
Magnus Damm | cc419fa0 | 2012-05-02 21:46:51 +0900 | [diff] [blame] | 328 | /* Uart divisor latch read */ |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 329 | static int default_serial_dl_read(struct uart_8250_port *up) |
Magnus Damm | cc419fa0 | 2012-05-02 21:46:51 +0900 | [diff] [blame] | 330 | { |
| 331 | return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8; |
| 332 | } |
| 333 | |
| 334 | /* Uart divisor latch write */ |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 335 | static void default_serial_dl_write(struct uart_8250_port *up, int value) |
Magnus Damm | cc419fa0 | 2012-05-02 21:46:51 +0900 | [diff] [blame] | 336 | { |
| 337 | serial_out(up, UART_DLL, value & 0xff); |
| 338 | serial_out(up, UART_DLM, value >> 8 & 0xff); |
| 339 | } |
| 340 | |
John Crispin | c420811 | 2013-01-25 19:39:51 +0100 | [diff] [blame] | 341 | #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 342 | |
John Crispin | c420811 | 2013-01-25 19:39:51 +0100 | [diff] [blame] | 343 | /* Au1x00/RT288x UART hardware has a weird register layout */ |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 344 | static const u8 au_io_in_map[] = { |
| 345 | [UART_RX] = 0, |
| 346 | [UART_IER] = 2, |
| 347 | [UART_IIR] = 3, |
| 348 | [UART_LCR] = 5, |
| 349 | [UART_MCR] = 6, |
| 350 | [UART_LSR] = 7, |
| 351 | [UART_MSR] = 8, |
| 352 | }; |
| 353 | |
| 354 | static const u8 au_io_out_map[] = { |
| 355 | [UART_TX] = 1, |
| 356 | [UART_IER] = 2, |
| 357 | [UART_FCR] = 4, |
| 358 | [UART_LCR] = 5, |
| 359 | [UART_MCR] = 6, |
| 360 | }; |
| 361 | |
Magnus Damm | 6b41603 | 2012-05-02 21:47:00 +0900 | [diff] [blame] | 362 | static unsigned int au_serial_in(struct uart_port *p, int offset) |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 363 | { |
Magnus Damm | 6b41603 | 2012-05-02 21:47:00 +0900 | [diff] [blame] | 364 | offset = au_io_in_map[offset] << p->regshift; |
| 365 | return __raw_readl(p->membase + offset); |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 366 | } |
| 367 | |
Magnus Damm | 6b41603 | 2012-05-02 21:47:00 +0900 | [diff] [blame] | 368 | static void au_serial_out(struct uart_port *p, int offset, int value) |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 369 | { |
Magnus Damm | 6b41603 | 2012-05-02 21:47:00 +0900 | [diff] [blame] | 370 | offset = au_io_out_map[offset] << p->regshift; |
| 371 | __raw_writel(value, p->membase + offset); |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 372 | } |
| 373 | |
Magnus Damm | 6b41603 | 2012-05-02 21:47:00 +0900 | [diff] [blame] | 374 | /* Au1x00 haven't got a standard divisor latch */ |
| 375 | static int au_serial_dl_read(struct uart_8250_port *up) |
| 376 | { |
| 377 | return __raw_readl(up->port.membase + 0x28); |
| 378 | } |
| 379 | |
| 380 | static void au_serial_dl_write(struct uart_8250_port *up, int value) |
| 381 | { |
| 382 | __raw_writel(value, up->port.membase + 0x28); |
| 383 | } |
| 384 | |
| 385 | #endif |
| 386 | |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 387 | static unsigned int hub6_serial_in(struct uart_port *p, int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | { |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 389 | offset = offset << p->regshift; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 390 | outb(p->hub6 - 1 + offset, p->iobase); |
| 391 | return inb(p->iobase + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 394 | static void hub6_serial_out(struct uart_port *p, int offset, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 396 | offset = offset << p->regshift; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 397 | outb(p->hub6 - 1 + offset, p->iobase); |
| 398 | outb(value, p->iobase + 1); |
| 399 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 401 | static unsigned int mem_serial_in(struct uart_port *p, int offset) |
| 402 | { |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 403 | offset = offset << p->regshift; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 404 | return readb(p->membase + offset); |
| 405 | } |
| 406 | |
| 407 | static void mem_serial_out(struct uart_port *p, int offset, int value) |
| 408 | { |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 409 | offset = offset << p->regshift; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 410 | writeb(value, p->membase + offset); |
| 411 | } |
| 412 | |
| 413 | static void mem32_serial_out(struct uart_port *p, int offset, int value) |
| 414 | { |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 415 | offset = offset << p->regshift; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 416 | writel(value, p->membase + offset); |
| 417 | } |
| 418 | |
| 419 | static unsigned int mem32_serial_in(struct uart_port *p, int offset) |
| 420 | { |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 421 | offset = offset << p->regshift; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 422 | return readl(p->membase + offset); |
| 423 | } |
| 424 | |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 425 | static unsigned int io_serial_in(struct uart_port *p, int offset) |
| 426 | { |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 427 | offset = offset << p->regshift; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 428 | return inb(p->iobase + offset); |
| 429 | } |
| 430 | |
| 431 | static void io_serial_out(struct uart_port *p, int offset, int value) |
| 432 | { |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 433 | offset = offset << p->regshift; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 434 | outb(value, p->iobase + offset); |
| 435 | } |
| 436 | |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 437 | static int serial8250_default_handle_irq(struct uart_port *port); |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 438 | static int exar_handle_irq(struct uart_port *port); |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 439 | |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 440 | static void set_io_from_upio(struct uart_port *p) |
| 441 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 442 | struct uart_8250_port *up = |
| 443 | container_of(p, struct uart_8250_port, port); |
Magnus Damm | cc419fa0 | 2012-05-02 21:46:51 +0900 | [diff] [blame] | 444 | |
Magnus Damm | e815562 | 2012-05-02 21:47:18 +0900 | [diff] [blame] | 445 | up->dl_read = default_serial_dl_read; |
| 446 | up->dl_write = default_serial_dl_write; |
Magnus Damm | cc419fa0 | 2012-05-02 21:46:51 +0900 | [diff] [blame] | 447 | |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 448 | switch (p->iotype) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | case UPIO_HUB6: |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 450 | p->serial_in = hub6_serial_in; |
| 451 | p->serial_out = hub6_serial_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | break; |
| 453 | |
| 454 | case UPIO_MEM: |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 455 | p->serial_in = mem_serial_in; |
| 456 | p->serial_out = mem_serial_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | break; |
| 458 | |
| 459 | case UPIO_MEM32: |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 460 | p->serial_in = mem32_serial_in; |
| 461 | p->serial_out = mem32_serial_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | break; |
| 463 | |
John Crispin | c420811 | 2013-01-25 19:39:51 +0100 | [diff] [blame] | 464 | #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 465 | case UPIO_AU: |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 466 | p->serial_in = au_serial_in; |
| 467 | p->serial_out = au_serial_out; |
Magnus Damm | 6b41603 | 2012-05-02 21:47:00 +0900 | [diff] [blame] | 468 | up->dl_read = au_serial_dl_read; |
| 469 | up->dl_write = au_serial_dl_write; |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 470 | break; |
Magnus Damm | 6b41603 | 2012-05-02 21:47:00 +0900 | [diff] [blame] | 471 | #endif |
Manuel Lauss | 12bf3f2 | 2010-07-15 21:45:05 +0200 | [diff] [blame] | 472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | default: |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 474 | p->serial_in = io_serial_in; |
| 475 | p->serial_out = io_serial_out; |
| 476 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
Alan Cox | b8e7e40 | 2009-05-28 14:01:35 +0100 | [diff] [blame] | 478 | /* Remember loaded iotype */ |
| 479 | up->cur_iotype = p->iotype; |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 480 | p->handle_irq = serial8250_default_handle_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 483 | static void |
Paul Gortmaker | 55e4016 | 2012-03-08 19:12:14 -0500 | [diff] [blame] | 484 | serial_port_out_sync(struct uart_port *p, int offset, int value) |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 485 | { |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 486 | switch (p->iotype) { |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 487 | case UPIO_MEM: |
| 488 | case UPIO_MEM32: |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 489 | case UPIO_AU: |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 490 | p->serial_out(p, offset, value); |
| 491 | p->serial_in(p, UART_LCR); /* safe, no side-effects */ |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 492 | break; |
| 493 | default: |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 494 | p->serial_out(p, offset, value); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 495 | } |
| 496 | } |
| 497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | /* |
| 499 | * For the 16C950 |
| 500 | */ |
| 501 | static void serial_icr_write(struct uart_8250_port *up, int offset, int value) |
| 502 | { |
| 503 | serial_out(up, UART_SCR, offset); |
| 504 | serial_out(up, UART_ICR, value); |
| 505 | } |
| 506 | |
| 507 | static unsigned int serial_icr_read(struct uart_8250_port *up, int offset) |
| 508 | { |
| 509 | unsigned int value; |
| 510 | |
| 511 | serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD); |
| 512 | serial_out(up, UART_SCR, offset); |
| 513 | value = serial_in(up, UART_ICR); |
| 514 | serial_icr_write(up, UART_ACR, up->acr); |
| 515 | |
| 516 | return value; |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * FIFO support. |
| 521 | */ |
Will Newton | b5d674a | 2008-10-13 10:36:21 +0100 | [diff] [blame] | 522 | static void serial8250_clear_fifos(struct uart_8250_port *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
| 524 | if (p->capabilities & UART_CAP_FIFO) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 525 | serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO); |
| 526 | serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 528 | serial_out(p, UART_FCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | } |
| 530 | } |
| 531 | |
Sudhakar Mamillapalli | 0ad372b | 2012-04-10 14:10:58 -0700 | [diff] [blame] | 532 | void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p) |
| 533 | { |
| 534 | unsigned char fcr; |
| 535 | |
| 536 | serial8250_clear_fifos(p); |
| 537 | fcr = uart_config[p->port.type].fcr; |
| 538 | serial_out(p, UART_FCR, fcr); |
| 539 | } |
| 540 | EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos); |
| 541 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | /* |
| 543 | * IER sleep support. UARTs which have EFRs need the "extended |
| 544 | * capability" bit enabled. Note that on XR16C850s, we need to |
| 545 | * reset LCR to write to IER. |
| 546 | */ |
Will Newton | b5d674a | 2008-10-13 10:36:21 +0100 | [diff] [blame] | 547 | static void serial8250_set_sleep(struct uart_8250_port *p, int sleep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | { |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 549 | /* |
| 550 | * Exar UARTs have a SLEEP register that enables or disables |
| 551 | * each UART to enter sleep mode separately. On the XR17V35x the |
| 552 | * register is accessible to each UART at the UART_EXAR_SLEEP |
| 553 | * offset but the UART channel may only write to the corresponding |
| 554 | * bit. |
| 555 | */ |
Matt Schulte | 81db077 | 2012-11-21 09:39:07 -0600 | [diff] [blame] | 556 | if ((p->port.type == PORT_XR17V35X) || |
| 557 | (p->port.type == PORT_XR17D15X)) { |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 558 | serial_out(p, UART_EXAR_SLEEP, 0xff); |
| 559 | return; |
| 560 | } |
| 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | if (p->capabilities & UART_CAP_SLEEP) { |
| 563 | if (p->capabilities & UART_CAP_EFR) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 564 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); |
| 565 | serial_out(p, UART_EFR, UART_EFR_ECB); |
| 566 | serial_out(p, UART_LCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 568 | serial_out(p, UART_IER, sleep ? UART_IERX_SLEEP : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | if (p->capabilities & UART_CAP_EFR) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 570 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); |
| 571 | serial_out(p, UART_EFR, 0); |
| 572 | serial_out(p, UART_LCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | #ifdef CONFIG_SERIAL_8250_RSA |
| 578 | /* |
| 579 | * Attempts to turn on the RSA FIFO. Returns zero on failure. |
| 580 | * We set the port uart clock rate if we succeed. |
| 581 | */ |
| 582 | static int __enable_rsa(struct uart_8250_port *up) |
| 583 | { |
| 584 | unsigned char mode; |
| 585 | int result; |
| 586 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 587 | mode = serial_in(up, UART_RSA_MSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | result = mode & UART_RSA_MSR_FIFO; |
| 589 | |
| 590 | if (!result) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 591 | serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO); |
| 592 | mode = serial_in(up, UART_RSA_MSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | result = mode & UART_RSA_MSR_FIFO; |
| 594 | } |
| 595 | |
| 596 | if (result) |
| 597 | up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16; |
| 598 | |
| 599 | return result; |
| 600 | } |
| 601 | |
| 602 | static void enable_rsa(struct uart_8250_port *up) |
| 603 | { |
| 604 | if (up->port.type == PORT_RSA) { |
| 605 | if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { |
| 606 | spin_lock_irq(&up->port.lock); |
| 607 | __enable_rsa(up); |
| 608 | spin_unlock_irq(&up->port.lock); |
| 609 | } |
| 610 | if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 611 | serial_out(up, UART_RSA_FRR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | } |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * Attempts to turn off the RSA FIFO. Returns zero on failure. |
| 617 | * It is unknown why interrupts were disabled in here. However, |
| 618 | * the caller is expected to preserve this behaviour by grabbing |
| 619 | * the spinlock before calling this function. |
| 620 | */ |
| 621 | static void disable_rsa(struct uart_8250_port *up) |
| 622 | { |
| 623 | unsigned char mode; |
| 624 | int result; |
| 625 | |
| 626 | if (up->port.type == PORT_RSA && |
| 627 | up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { |
| 628 | spin_lock_irq(&up->port.lock); |
| 629 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 630 | mode = serial_in(up, UART_RSA_MSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | result = !(mode & UART_RSA_MSR_FIFO); |
| 632 | |
| 633 | if (!result) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 634 | serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO); |
| 635 | mode = serial_in(up, UART_RSA_MSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | result = !(mode & UART_RSA_MSR_FIFO); |
| 637 | } |
| 638 | |
| 639 | if (result) |
| 640 | up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; |
| 641 | spin_unlock_irq(&up->port.lock); |
| 642 | } |
| 643 | } |
| 644 | #endif /* CONFIG_SERIAL_8250_RSA */ |
| 645 | |
| 646 | /* |
| 647 | * This is a quickie test to see how big the FIFO is. |
| 648 | * It doesn't work at all the time, more's the pity. |
| 649 | */ |
| 650 | static int size_fifo(struct uart_8250_port *up) |
| 651 | { |
Jon Anders Haugum | b32b19b | 2006-04-30 11:20:56 +0100 | [diff] [blame] | 652 | unsigned char old_fcr, old_mcr, old_lcr; |
| 653 | unsigned short old_dl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | int count; |
| 655 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 656 | old_lcr = serial_in(up, UART_LCR); |
| 657 | serial_out(up, UART_LCR, 0); |
| 658 | old_fcr = serial_in(up, UART_FCR); |
| 659 | old_mcr = serial_in(up, UART_MCR); |
| 660 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 662 | serial_out(up, UART_MCR, UART_MCR_LOOP); |
| 663 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
Jon Anders Haugum | b32b19b | 2006-04-30 11:20:56 +0100 | [diff] [blame] | 664 | old_dl = serial_dl_read(up); |
| 665 | serial_dl_write(up, 0x0001); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 666 | serial_out(up, UART_LCR, 0x03); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | for (count = 0; count < 256; count++) |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 668 | serial_out(up, UART_TX, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | mdelay(20);/* FIXME - schedule_timeout */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 670 | for (count = 0; (serial_in(up, UART_LSR) & UART_LSR_DR) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | (count < 256); count++) |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 672 | serial_in(up, UART_RX); |
| 673 | serial_out(up, UART_FCR, old_fcr); |
| 674 | serial_out(up, UART_MCR, old_mcr); |
| 675 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
Jon Anders Haugum | b32b19b | 2006-04-30 11:20:56 +0100 | [diff] [blame] | 676 | serial_dl_write(up, old_dl); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 677 | serial_out(up, UART_LCR, old_lcr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | |
| 679 | return count; |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * Read UART ID using the divisor method - set DLL and DLM to zero |
| 684 | * and the revision will be in DLL and device type in DLM. We |
| 685 | * preserve the device state across this. |
| 686 | */ |
| 687 | static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p) |
| 688 | { |
| 689 | unsigned char old_dll, old_dlm, old_lcr; |
| 690 | unsigned int id; |
| 691 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 692 | old_lcr = serial_in(p, UART_LCR); |
| 693 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 695 | old_dll = serial_in(p, UART_DLL); |
| 696 | old_dlm = serial_in(p, UART_DLM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 698 | serial_out(p, UART_DLL, 0); |
| 699 | serial_out(p, UART_DLM, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 701 | id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 703 | serial_out(p, UART_DLL, old_dll); |
| 704 | serial_out(p, UART_DLM, old_dlm); |
| 705 | serial_out(p, UART_LCR, old_lcr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
| 707 | return id; |
| 708 | } |
| 709 | |
| 710 | /* |
| 711 | * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's. |
| 712 | * When this function is called we know it is at least a StarTech |
| 713 | * 16650 V2, but it might be one of several StarTech UARTs, or one of |
| 714 | * its clones. (We treat the broken original StarTech 16650 V1 as a |
| 715 | * 16550, and why not? Startech doesn't seem to even acknowledge its |
| 716 | * existence.) |
Thomas Koeller | bd71c18 | 2007-05-06 14:48:47 -0700 | [diff] [blame] | 717 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | * What evil have men's minds wrought... |
| 719 | */ |
| 720 | static void autoconfig_has_efr(struct uart_8250_port *up) |
| 721 | { |
| 722 | unsigned int id1, id2, id3, rev; |
| 723 | |
| 724 | /* |
| 725 | * Everything with an EFR has SLEEP |
| 726 | */ |
| 727 | up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; |
| 728 | |
| 729 | /* |
| 730 | * First we check to see if it's an Oxford Semiconductor UART. |
| 731 | * |
| 732 | * If we have to do this here because some non-National |
| 733 | * Semiconductor clone chips lock up if you try writing to the |
| 734 | * LSR register (which serial_icr_read does) |
| 735 | */ |
| 736 | |
| 737 | /* |
| 738 | * Check for Oxford Semiconductor 16C950. |
| 739 | * |
| 740 | * EFR [4] must be set else this test fails. |
| 741 | * |
| 742 | * This shouldn't be necessary, but Mike Hudson (Exoray@isys.ca) |
| 743 | * claims that it's needed for 952 dual UART's (which are not |
| 744 | * recommended for new designs). |
| 745 | */ |
| 746 | up->acr = 0; |
Andrei Emeltchenko | 662b083a | 2010-11-30 14:11:49 -0800 | [diff] [blame] | 747 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | serial_out(up, UART_EFR, UART_EFR_ECB); |
| 749 | serial_out(up, UART_LCR, 0x00); |
| 750 | id1 = serial_icr_read(up, UART_ID1); |
| 751 | id2 = serial_icr_read(up, UART_ID2); |
| 752 | id3 = serial_icr_read(up, UART_ID3); |
| 753 | rev = serial_icr_read(up, UART_REV); |
| 754 | |
| 755 | DEBUG_AUTOCONF("950id=%02x:%02x:%02x:%02x ", id1, id2, id3, rev); |
| 756 | |
| 757 | if (id1 == 0x16 && id2 == 0xC9 && |
| 758 | (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) { |
| 759 | up->port.type = PORT_16C950; |
Russell King | 4ba5e35 | 2005-06-23 10:43:04 +0100 | [diff] [blame] | 760 | |
| 761 | /* |
| 762 | * Enable work around for the Oxford Semiconductor 952 rev B |
| 763 | * chip which causes it to seriously miscalculate baud rates |
| 764 | * when DLL is 0. |
| 765 | */ |
| 766 | if (id3 == 0x52 && rev == 0x01) |
| 767 | up->bugs |= UART_BUG_QUOT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | return; |
| 769 | } |
Thomas Koeller | bd71c18 | 2007-05-06 14:48:47 -0700 | [diff] [blame] | 770 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | /* |
| 772 | * We check for a XR16C850 by setting DLL and DLM to 0, and then |
| 773 | * reading back DLL and DLM. The chip type depends on the DLM |
| 774 | * value read back: |
| 775 | * 0x10 - XR16C850 and the DLL contains the chip revision. |
| 776 | * 0x12 - XR16C2850. |
| 777 | * 0x14 - XR16C854. |
| 778 | */ |
| 779 | id1 = autoconfig_read_divisor_id(up); |
| 780 | DEBUG_AUTOCONF("850id=%04x ", id1); |
| 781 | |
| 782 | id2 = id1 >> 8; |
| 783 | if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | up->port.type = PORT_16850; |
| 785 | return; |
| 786 | } |
| 787 | |
| 788 | /* |
| 789 | * It wasn't an XR16C850. |
| 790 | * |
| 791 | * We distinguish between the '654 and the '650 by counting |
| 792 | * how many bytes are in the FIFO. I'm using this for now, |
| 793 | * since that's the technique that was sent to me in the |
| 794 | * serial driver update, but I'm not convinced this works. |
| 795 | * I've had problems doing this in the past. -TYT |
| 796 | */ |
| 797 | if (size_fifo(up) == 64) |
| 798 | up->port.type = PORT_16654; |
| 799 | else |
| 800 | up->port.type = PORT_16650V2; |
| 801 | } |
| 802 | |
| 803 | /* |
| 804 | * We detected a chip without a FIFO. Only two fall into |
| 805 | * this category - the original 8250 and the 16450. The |
| 806 | * 16450 has a scratch register (accessible with LCR=0) |
| 807 | */ |
| 808 | static void autoconfig_8250(struct uart_8250_port *up) |
| 809 | { |
| 810 | unsigned char scratch, status1, status2; |
| 811 | |
| 812 | up->port.type = PORT_8250; |
| 813 | |
| 814 | scratch = serial_in(up, UART_SCR); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 815 | serial_out(up, UART_SCR, 0xa5); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | status1 = serial_in(up, UART_SCR); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 817 | serial_out(up, UART_SCR, 0x5a); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | status2 = serial_in(up, UART_SCR); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 819 | serial_out(up, UART_SCR, scratch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
| 821 | if (status1 == 0xa5 && status2 == 0x5a) |
| 822 | up->port.type = PORT_16450; |
| 823 | } |
| 824 | |
| 825 | static int broken_efr(struct uart_8250_port *up) |
| 826 | { |
| 827 | /* |
| 828 | * Exar ST16C2550 "A2" devices incorrectly detect as |
| 829 | * having an EFR, and report an ID of 0x0201. See |
Justin P. Mattock | 631dd1a | 2010-10-18 11:03:14 +0200 | [diff] [blame] | 830 | * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | */ |
| 832 | if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16) |
| 833 | return 1; |
| 834 | |
| 835 | return 0; |
| 836 | } |
| 837 | |
Yin Kangkai | 0d0389e | 2011-02-09 11:35:18 +0800 | [diff] [blame] | 838 | static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) |
| 839 | { |
| 840 | unsigned char status; |
| 841 | |
| 842 | status = serial_in(up, 0x04); /* EXCR2 */ |
| 843 | #define PRESL(x) ((x) & 0x30) |
| 844 | if (PRESL(status) == 0x10) { |
| 845 | /* already in high speed mode */ |
| 846 | return 0; |
| 847 | } else { |
| 848 | status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ |
| 849 | status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 850 | serial_out(up, 0x04, status); |
Yin Kangkai | 0d0389e | 2011-02-09 11:35:18 +0800 | [diff] [blame] | 851 | } |
| 852 | return 1; |
| 853 | } |
| 854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | /* |
| 856 | * We know that the chip has FIFOs. Does it have an EFR? The |
| 857 | * EFR is located in the same register position as the IIR and |
| 858 | * we know the top two bits of the IIR are currently set. The |
| 859 | * EFR should contain zero. Try to read the EFR. |
| 860 | */ |
| 861 | static void autoconfig_16550a(struct uart_8250_port *up) |
| 862 | { |
| 863 | unsigned char status1, status2; |
| 864 | unsigned int iersave; |
| 865 | |
| 866 | up->port.type = PORT_16550A; |
| 867 | up->capabilities |= UART_CAP_FIFO; |
| 868 | |
| 869 | /* |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 870 | * XR17V35x UARTs have an extra divisor register, DLD |
| 871 | * that gets enabled with when DLAB is set which will |
| 872 | * cause the device to incorrectly match and assign |
| 873 | * port type to PORT_16650. The EFR for this UART is |
| 874 | * found at offset 0x09. Instead check the Deice ID (DVID) |
| 875 | * register for a 2, 4 or 8 port UART. |
| 876 | */ |
Matt Schulte | b7a7e14 | 2012-11-20 11:23:56 -0600 | [diff] [blame] | 877 | if (up->port.flags & UPF_EXAR_EFR) { |
| 878 | status1 = serial_in(up, UART_EXAR_DVID); |
| 879 | if (status1 == 0x82 || status1 == 0x84 || status1 == 0x88) { |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 880 | DEBUG_AUTOCONF("Exar XR17V35x "); |
| 881 | up->port.type = PORT_XR17V35X; |
| 882 | up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | |
| 883 | UART_CAP_SLEEP; |
| 884 | |
| 885 | return; |
| 886 | } |
| 887 | |
| 888 | } |
| 889 | |
| 890 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | * Check for presence of the EFR when DLAB is set. |
| 892 | * Only ST16C650V1 UARTs pass this test. |
| 893 | */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 894 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | if (serial_in(up, UART_EFR) == 0) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 896 | serial_out(up, UART_EFR, 0xA8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (serial_in(up, UART_EFR) != 0) { |
| 898 | DEBUG_AUTOCONF("EFRv1 "); |
| 899 | up->port.type = PORT_16650; |
| 900 | up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; |
| 901 | } else { |
| 902 | DEBUG_AUTOCONF("Motorola 8xxx DUART "); |
| 903 | } |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 904 | serial_out(up, UART_EFR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | return; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * Maybe it requires 0xbf to be written to the LCR. |
| 910 | * (other ST16C650V2 UARTs, TI16C752A, etc) |
| 911 | */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 912 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) { |
| 914 | DEBUG_AUTOCONF("EFRv2 "); |
| 915 | autoconfig_has_efr(up); |
| 916 | return; |
| 917 | } |
| 918 | |
| 919 | /* |
| 920 | * Check for a National Semiconductor SuperIO chip. |
| 921 | * Attempt to switch to bank 2, read the value of the LOOP bit |
| 922 | * from EXCR1. Switch back to bank 0, change it in MCR. Then |
| 923 | * switch back to bank 2, read it from EXCR1 again and check |
| 924 | * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 926 | serial_out(up, UART_LCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | status1 = serial_in(up, UART_MCR); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 928 | serial_out(up, UART_LCR, 0xE0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | status2 = serial_in(up, 0x02); /* EXCR1 */ |
| 930 | |
| 931 | if (!((status2 ^ status1) & UART_MCR_LOOP)) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 932 | serial_out(up, UART_LCR, 0); |
| 933 | serial_out(up, UART_MCR, status1 ^ UART_MCR_LOOP); |
| 934 | serial_out(up, UART_LCR, 0xE0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | status2 = serial_in(up, 0x02); /* EXCR1 */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 936 | serial_out(up, UART_LCR, 0); |
| 937 | serial_out(up, UART_MCR, status1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
| 939 | if ((status2 ^ status1) & UART_MCR_LOOP) { |
David Woodhouse | 857dde2 | 2005-05-21 15:52:23 +0100 | [diff] [blame] | 940 | unsigned short quot; |
| 941 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 942 | serial_out(up, UART_LCR, 0xE0); |
David Woodhouse | 857dde2 | 2005-05-21 15:52:23 +0100 | [diff] [blame] | 943 | |
Jon Anders Haugum | b32b19b | 2006-04-30 11:20:56 +0100 | [diff] [blame] | 944 | quot = serial_dl_read(up); |
David Woodhouse | 857dde2 | 2005-05-21 15:52:23 +0100 | [diff] [blame] | 945 | quot <<= 3; |
| 946 | |
Yin Kangkai | 0d0389e | 2011-02-09 11:35:18 +0800 | [diff] [blame] | 947 | if (ns16550a_goto_highspeed(up)) |
| 948 | serial_dl_write(up, quot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 950 | serial_out(up, UART_LCR, 0); |
David Woodhouse | 857dde2 | 2005-05-21 15:52:23 +0100 | [diff] [blame] | 951 | |
| 952 | up->port.uartclk = 921600*16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | up->port.type = PORT_NS16550A; |
| 954 | up->capabilities |= UART_NATSEMI; |
| 955 | return; |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | /* |
| 960 | * No EFR. Try to detect a TI16750, which only sets bit 5 of |
| 961 | * the IIR when 64 byte FIFO mode is enabled when DLAB is set. |
| 962 | * Try setting it with and without DLAB set. Cheap clones |
| 963 | * set bit 5 without DLAB set. |
| 964 | */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 965 | serial_out(up, UART_LCR, 0); |
| 966 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | status1 = serial_in(up, UART_IIR) >> 5; |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 968 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
| 969 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
| 970 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | status2 = serial_in(up, UART_IIR) >> 5; |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 972 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
| 973 | serial_out(up, UART_LCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | |
| 975 | DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2); |
| 976 | |
| 977 | if (status1 == 6 && status2 == 7) { |
| 978 | up->port.type = PORT_16750; |
| 979 | up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP; |
| 980 | return; |
| 981 | } |
| 982 | |
| 983 | /* |
| 984 | * Try writing and reading the UART_IER_UUE bit (b6). |
| 985 | * If it works, this is probably one of the Xscale platform's |
| 986 | * internal UARTs. |
| 987 | * We're going to explicitly set the UUE bit to 0 before |
| 988 | * trying to write and read a 1 just to make sure it's not |
| 989 | * already a 1 and maybe locked there before we even start start. |
| 990 | */ |
| 991 | iersave = serial_in(up, UART_IER); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 992 | serial_out(up, UART_IER, iersave & ~UART_IER_UUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | if (!(serial_in(up, UART_IER) & UART_IER_UUE)) { |
| 994 | /* |
| 995 | * OK it's in a known zero state, try writing and reading |
| 996 | * without disturbing the current state of the other bits. |
| 997 | */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 998 | serial_out(up, UART_IER, iersave | UART_IER_UUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | if (serial_in(up, UART_IER) & UART_IER_UUE) { |
| 1000 | /* |
| 1001 | * It's an Xscale. |
| 1002 | * We'll leave the UART_IER_UUE bit set to 1 (enabled). |
| 1003 | */ |
| 1004 | DEBUG_AUTOCONF("Xscale "); |
| 1005 | up->port.type = PORT_XSCALE; |
Stephen Warren | 5568181 | 2011-06-17 09:45:07 -0600 | [diff] [blame] | 1006 | up->capabilities |= UART_CAP_UUE | UART_CAP_RTOIE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | return; |
| 1008 | } |
| 1009 | } else { |
| 1010 | /* |
| 1011 | * If we got here we couldn't force the IER_UUE bit to 0. |
| 1012 | * Log it and continue. |
| 1013 | */ |
| 1014 | DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 "); |
| 1015 | } |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1016 | serial_out(up, UART_IER, iersave); |
Philippe Langlais | 235dae5 | 2010-07-29 17:13:57 +0200 | [diff] [blame] | 1017 | |
| 1018 | /* |
Søren Holm | 0631534 | 2011-09-02 22:55:37 +0200 | [diff] [blame] | 1019 | * Exar uarts have EFR in a weird location |
| 1020 | */ |
| 1021 | if (up->port.flags & UPF_EXAR_EFR) { |
Matt Schulte | 81db077 | 2012-11-21 09:39:07 -0600 | [diff] [blame] | 1022 | DEBUG_AUTOCONF("Exar XR17D15x "); |
Søren Holm | 0631534 | 2011-09-02 22:55:37 +0200 | [diff] [blame] | 1023 | up->port.type = PORT_XR17D15X; |
Matt Schulte | 81db077 | 2012-11-21 09:39:07 -0600 | [diff] [blame] | 1024 | up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | |
| 1025 | UART_CAP_SLEEP; |
| 1026 | |
| 1027 | return; |
Søren Holm | 0631534 | 2011-09-02 22:55:37 +0200 | [diff] [blame] | 1028 | } |
| 1029 | |
| 1030 | /* |
Philippe Langlais | 235dae5 | 2010-07-29 17:13:57 +0200 | [diff] [blame] | 1031 | * We distinguish between 16550A and U6 16550A by counting |
| 1032 | * how many bytes are in the FIFO. |
| 1033 | */ |
| 1034 | if (up->port.type == PORT_16550A && size_fifo(up) == 64) { |
| 1035 | up->port.type = PORT_U6_16550A; |
| 1036 | up->capabilities |= UART_CAP_AFE; |
| 1037 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | /* |
| 1041 | * This routine is called by rs_init() to initialize a specific serial |
| 1042 | * port. It determines what type of UART chip this serial port is |
| 1043 | * using: 8250, 16450, 16550, 16550A. The important question is |
| 1044 | * whether or not this UART is a 16550A or not, since this will |
| 1045 | * determine whether or not we can use its FIFO features or not. |
| 1046 | */ |
| 1047 | static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) |
| 1048 | { |
| 1049 | unsigned char status1, scratch, scratch2, scratch3; |
| 1050 | unsigned char save_lcr, save_mcr; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1051 | struct uart_port *port = &up->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | unsigned long flags; |
Flavio Leitner | bd21f551 | 2012-09-18 16:21:32 -0300 | [diff] [blame] | 1053 | unsigned int old_capabilities; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1055 | if (!port->iobase && !port->mapbase && !port->membase) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | return; |
| 1057 | |
Lennert Buytenhek | 80647b9 | 2009-11-11 14:26:41 -0800 | [diff] [blame] | 1058 | DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ", |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1059 | serial_index(port), port->iobase, port->membase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | |
| 1061 | /* |
| 1062 | * We really do need global IRQs disabled here - we're going to |
| 1063 | * be frobbing the chips IRQ enable register to see if it exists. |
| 1064 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1065 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
| 1067 | up->capabilities = 0; |
Russell King | 4ba5e35 | 2005-06-23 10:43:04 +0100 | [diff] [blame] | 1068 | up->bugs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1070 | if (!(port->flags & UPF_BUGGY_UART)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | /* |
| 1072 | * Do a simple existence test first; if we fail this, |
| 1073 | * there's no point trying anything else. |
Thomas Koeller | bd71c18 | 2007-05-06 14:48:47 -0700 | [diff] [blame] | 1074 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | * 0x80 is used as a nonsense port to prevent against |
| 1076 | * false positives due to ISA bus float. The |
| 1077 | * assumption is that 0x80 is a non-existent port; |
| 1078 | * which should be safe since include/asm/io.h also |
| 1079 | * makes this assumption. |
| 1080 | * |
| 1081 | * Note: this is safe as long as MCR bit 4 is clear |
| 1082 | * and the device is in "PC" mode. |
| 1083 | */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1084 | scratch = serial_in(up, UART_IER); |
| 1085 | serial_out(up, UART_IER, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | #ifdef __i386__ |
| 1087 | outb(0xff, 0x080); |
| 1088 | #endif |
Thomas Hoehn | 4821200 | 2007-02-10 01:46:05 -0800 | [diff] [blame] | 1089 | /* |
| 1090 | * Mask out IER[7:4] bits for test as some UARTs (e.g. TL |
| 1091 | * 16C754B) allow only to modify them if an EFR bit is set. |
| 1092 | */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1093 | scratch2 = serial_in(up, UART_IER) & 0x0f; |
| 1094 | serial_out(up, UART_IER, 0x0F); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | #ifdef __i386__ |
| 1096 | outb(0, 0x080); |
| 1097 | #endif |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1098 | scratch3 = serial_in(up, UART_IER) & 0x0f; |
| 1099 | serial_out(up, UART_IER, scratch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | if (scratch2 != 0 || scratch3 != 0x0F) { |
| 1101 | /* |
| 1102 | * We failed; there's nothing here |
| 1103 | */ |
Flavio Leitner | bd21f551 | 2012-09-18 16:21:32 -0300 | [diff] [blame] | 1104 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | DEBUG_AUTOCONF("IER test failed (%02x, %02x) ", |
| 1106 | scratch2, scratch3); |
| 1107 | goto out; |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | save_mcr = serial_in(up, UART_MCR); |
| 1112 | save_lcr = serial_in(up, UART_LCR); |
| 1113 | |
Thomas Koeller | bd71c18 | 2007-05-06 14:48:47 -0700 | [diff] [blame] | 1114 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | * Check to see if a UART is really there. Certain broken |
| 1116 | * internal modems based on the Rockwell chipset fail this |
| 1117 | * test, because they apparently don't implement the loopback |
| 1118 | * test mode. So this test is skipped on the COM 1 through |
| 1119 | * COM 4 ports. This *should* be safe, since no board |
| 1120 | * manufacturer would be stupid enough to design a board |
| 1121 | * that conflicts with COM 1-4 --- we hope! |
| 1122 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1123 | if (!(port->flags & UPF_SKIP_TEST)) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1124 | serial_out(up, UART_MCR, UART_MCR_LOOP | 0x0A); |
| 1125 | status1 = serial_in(up, UART_MSR) & 0xF0; |
| 1126 | serial_out(up, UART_MCR, save_mcr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | if (status1 != 0x90) { |
Flavio Leitner | bd21f551 | 2012-09-18 16:21:32 -0300 | [diff] [blame] | 1128 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | DEBUG_AUTOCONF("LOOP test failed (%02x) ", |
| 1130 | status1); |
| 1131 | goto out; |
| 1132 | } |
| 1133 | } |
| 1134 | |
| 1135 | /* |
| 1136 | * We're pretty sure there's a port here. Lets find out what |
| 1137 | * type of port it is. The IIR top two bits allows us to find |
Russell King | 6f0d618 | 2005-09-09 16:17:58 +0100 | [diff] [blame] | 1138 | * out if it's 8250 or 16450, 16550, 16550A or later. This |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | * determines what we test for next. |
| 1140 | * |
| 1141 | * We also initialise the EFR (if any) to zero for later. The |
| 1142 | * EFR occupies the same register location as the FCR and IIR. |
| 1143 | */ |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1144 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
| 1145 | serial_out(up, UART_EFR, 0); |
| 1146 | serial_out(up, UART_LCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1148 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | scratch = serial_in(up, UART_IIR) >> 6; |
| 1150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | switch (scratch) { |
| 1152 | case 0: |
| 1153 | autoconfig_8250(up); |
| 1154 | break; |
| 1155 | case 1: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1156 | port->type = PORT_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | break; |
| 1158 | case 2: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1159 | port->type = PORT_16550; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | break; |
| 1161 | case 3: |
| 1162 | autoconfig_16550a(up); |
| 1163 | break; |
| 1164 | } |
| 1165 | |
| 1166 | #ifdef CONFIG_SERIAL_8250_RSA |
| 1167 | /* |
| 1168 | * Only probe for RSA ports if we got the region. |
| 1169 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1170 | if (port->type == PORT_16550A && probeflags & PROBE_RSA) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | int i; |
| 1172 | |
| 1173 | for (i = 0 ; i < probe_rsa_count; ++i) { |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1174 | if (probe_rsa[i] == port->iobase && __enable_rsa(up)) { |
| 1175 | port->type = PORT_RSA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | break; |
| 1177 | } |
| 1178 | } |
| 1179 | } |
| 1180 | #endif |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 1181 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1182 | serial_out(up, UART_LCR, save_lcr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1184 | port->fifosize = uart_config[up->port.type].fifo_size; |
Flavio Leitner | bd21f551 | 2012-09-18 16:21:32 -0300 | [diff] [blame] | 1185 | old_capabilities = up->capabilities; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1186 | up->capabilities = uart_config[port->type].flags; |
| 1187 | up->tx_loadsz = uart_config[port->type].tx_loadsz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1189 | if (port->type == PORT_UNKNOWN) |
Flavio Leitner | bd21f551 | 2012-09-18 16:21:32 -0300 | [diff] [blame] | 1190 | goto out_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | |
| 1192 | /* |
| 1193 | * Reset the UART. |
| 1194 | */ |
| 1195 | #ifdef CONFIG_SERIAL_8250_RSA |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1196 | if (port->type == PORT_RSA) |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1197 | serial_out(up, UART_RSA_FRR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | #endif |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1199 | serial_out(up, UART_MCR, save_mcr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | serial8250_clear_fifos(up); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1201 | serial_in(up, UART_RX); |
Lennert Buytenhek | 5c8c755 | 2005-11-12 21:58:05 +0000 | [diff] [blame] | 1202 | if (up->capabilities & UART_CAP_UUE) |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1203 | serial_out(up, UART_IER, UART_IER_UUE); |
Lennert Buytenhek | 5c8c755 | 2005-11-12 21:58:05 +0000 | [diff] [blame] | 1204 | else |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1205 | serial_out(up, UART_IER, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | |
Flavio Leitner | bd21f551 | 2012-09-18 16:21:32 -0300 | [diff] [blame] | 1207 | out_lock: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1208 | spin_unlock_irqrestore(&port->lock, flags); |
Flavio Leitner | bd21f551 | 2012-09-18 16:21:32 -0300 | [diff] [blame] | 1209 | if (up->capabilities != old_capabilities) { |
| 1210 | printk(KERN_WARNING |
| 1211 | "ttyS%d: detected caps %08x should be %08x\n", |
| 1212 | serial_index(port), old_capabilities, |
| 1213 | up->capabilities); |
| 1214 | } |
| 1215 | out: |
| 1216 | DEBUG_AUTOCONF("iir=%d ", scratch); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1217 | DEBUG_AUTOCONF("type=%s\n", uart_config[port->type].name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | } |
| 1219 | |
| 1220 | static void autoconfig_irq(struct uart_8250_port *up) |
| 1221 | { |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1222 | struct uart_port *port = &up->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | unsigned char save_mcr, save_ier; |
| 1224 | unsigned char save_ICP = 0; |
| 1225 | unsigned int ICP = 0; |
| 1226 | unsigned long irqs; |
| 1227 | int irq; |
| 1228 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1229 | if (port->flags & UPF_FOURPORT) { |
| 1230 | ICP = (port->iobase & 0xfe0) | 0x1f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | save_ICP = inb_p(ICP); |
| 1232 | outb_p(0x80, ICP); |
Paul Gortmaker | 0d263a2 | 2012-03-08 19:12:10 -0500 | [diff] [blame] | 1233 | inb_p(ICP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | } |
| 1235 | |
| 1236 | /* forget possible initially masked and pending IRQ */ |
| 1237 | probe_irq_off(probe_irq_on()); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1238 | save_mcr = serial_in(up, UART_MCR); |
| 1239 | save_ier = serial_in(up, UART_IER); |
| 1240 | serial_out(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2); |
Thomas Koeller | bd71c18 | 2007-05-06 14:48:47 -0700 | [diff] [blame] | 1241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | irqs = probe_irq_on(); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1243 | serial_out(up, UART_MCR, 0); |
Alan Cox | 6f803cd | 2008-02-08 04:18:52 -0800 | [diff] [blame] | 1244 | udelay(10); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1245 | if (port->flags & UPF_FOURPORT) { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1246 | serial_out(up, UART_MCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | UART_MCR_DTR | UART_MCR_RTS); |
| 1248 | } else { |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1249 | serial_out(up, UART_MCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2); |
| 1251 | } |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1252 | serial_out(up, UART_IER, 0x0f); /* enable all intrs */ |
Paul Gortmaker | 0d263a2 | 2012-03-08 19:12:10 -0500 | [diff] [blame] | 1253 | serial_in(up, UART_LSR); |
| 1254 | serial_in(up, UART_RX); |
| 1255 | serial_in(up, UART_IIR); |
| 1256 | serial_in(up, UART_MSR); |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1257 | serial_out(up, UART_TX, 0xFF); |
Alan Cox | 6f803cd | 2008-02-08 04:18:52 -0800 | [diff] [blame] | 1258 | udelay(20); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | irq = probe_irq_off(irqs); |
| 1260 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1261 | serial_out(up, UART_MCR, save_mcr); |
| 1262 | serial_out(up, UART_IER, save_ier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1264 | if (port->flags & UPF_FOURPORT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | outb_p(save_ICP, ICP); |
| 1266 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1267 | port->irq = (irq > 0) ? irq : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
Russell King | e763b90 | 2005-06-29 18:41:51 +0100 | [diff] [blame] | 1270 | static inline void __stop_tx(struct uart_8250_port *p) |
| 1271 | { |
| 1272 | if (p->ier & UART_IER_THRI) { |
| 1273 | p->ier &= ~UART_IER_THRI; |
| 1274 | serial_out(p, UART_IER, p->ier); |
| 1275 | } |
| 1276 | } |
| 1277 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 1278 | static void serial8250_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1280 | struct uart_8250_port *up = |
| 1281 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | |
Russell King | e763b90 | 2005-06-29 18:41:51 +0100 | [diff] [blame] | 1283 | __stop_tx(up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
| 1285 | /* |
Russell King | e763b90 | 2005-06-29 18:41:51 +0100 | [diff] [blame] | 1286 | * We really want to stop the transmitter from sending. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1288 | if (port->type == PORT_16C950) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | up->acr |= UART_ACR_TXDIS; |
| 1290 | serial_icr_write(up, UART_ACR, up->acr); |
| 1291 | } |
| 1292 | } |
| 1293 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 1294 | static void serial8250_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1296 | struct uart_8250_port *up = |
| 1297 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 1299 | if (up->dma && !serial8250_tx_dma(up)) { |
| 1300 | return; |
| 1301 | } else if (!(up->ier & UART_IER_THRI)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | up->ier |= UART_IER_THRI; |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1303 | serial_port_out(port, UART_IER, up->ier); |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 1304 | |
Russell King | 67f7654 | 2005-06-23 22:26:43 +0100 | [diff] [blame] | 1305 | if (up->bugs & UART_BUG_TXEN) { |
Ian Jackson | 68cb4f8 | 2009-11-18 11:08:11 +0100 | [diff] [blame] | 1306 | unsigned char lsr; |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 1307 | lsr = serial_in(up, UART_LSR); |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1308 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; |
Ralf Baechle | a205a56 | 2012-12-18 11:41:14 +0100 | [diff] [blame] | 1309 | if (lsr & UART_LSR_TEMT) |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1310 | serial8250_tx_chars(up); |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 1311 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | } |
Russell King | e763b90 | 2005-06-29 18:41:51 +0100 | [diff] [blame] | 1313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | /* |
Russell King | e763b90 | 2005-06-29 18:41:51 +0100 | [diff] [blame] | 1315 | * Re-enable the transmitter if we disabled it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1317 | if (port->type == PORT_16C950 && up->acr & UART_ACR_TXDIS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | up->acr &= ~UART_ACR_TXDIS; |
| 1319 | serial_icr_write(up, UART_ACR, up->acr); |
| 1320 | } |
| 1321 | } |
| 1322 | |
| 1323 | static void serial8250_stop_rx(struct uart_port *port) |
| 1324 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1325 | struct uart_8250_port *up = |
| 1326 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | |
| 1328 | up->ier &= ~UART_IER_RLSI; |
| 1329 | up->port.read_status_mask &= ~UART_LSR_DR; |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1330 | serial_port_out(port, UART_IER, up->ier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | } |
| 1332 | |
| 1333 | static void serial8250_enable_ms(struct uart_port *port) |
| 1334 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1335 | struct uart_8250_port *up = |
| 1336 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 1338 | /* no MSR capabilities */ |
| 1339 | if (up->bugs & UART_BUG_NOMSR) |
| 1340 | return; |
| 1341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | up->ier |= UART_IER_MSI; |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1343 | serial_port_out(port, UART_IER, up->ier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | } |
| 1345 | |
Stephen Warren | 5f873ba | 2011-05-17 16:12:37 -0600 | [diff] [blame] | 1346 | /* |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1347 | * serial8250_rx_chars: processes according to the passed in LSR |
Paul Gortmaker | 0690f41 | 2011-12-04 18:42:19 -0500 | [diff] [blame] | 1348 | * value, and returns the remaining LSR bits not handled |
| 1349 | * by this Rx routine. |
| 1350 | */ |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1351 | unsigned char |
| 1352 | serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | { |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1354 | struct uart_port *port = &up->port; |
Paul Gortmaker | 0690f41 | 2011-12-04 18:42:19 -0500 | [diff] [blame] | 1355 | unsigned char ch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | int max_count = 256; |
| 1357 | char flag; |
| 1358 | |
| 1359 | do { |
Aristeu Rozanski | 7500b1f | 2008-07-23 21:29:45 -0700 | [diff] [blame] | 1360 | if (likely(lsr & UART_LSR_DR)) |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1361 | ch = serial_in(up, UART_RX); |
Aristeu Rozanski | 7500b1f | 2008-07-23 21:29:45 -0700 | [diff] [blame] | 1362 | else |
| 1363 | /* |
| 1364 | * Intel 82571 has a Serial Over Lan device that will |
| 1365 | * set UART_LSR_BI without setting UART_LSR_DR when |
| 1366 | * it receives a break. To avoid reading from the |
| 1367 | * receive buffer without UART_LSR_DR bit set, we |
| 1368 | * just force the read character to be 0 |
| 1369 | */ |
| 1370 | ch = 0; |
| 1371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | flag = TTY_NORMAL; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1373 | port->icount.rx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1375 | lsr |= up->lsr_saved_flags; |
| 1376 | up->lsr_saved_flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1378 | if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | if (lsr & UART_LSR_BI) { |
| 1380 | lsr &= ~(UART_LSR_FE | UART_LSR_PE); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1381 | port->icount.brk++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | /* |
| 1383 | * We do the SysRQ and SAK checking |
| 1384 | * here because otherwise the break |
| 1385 | * may get masked by ignore_status_mask |
| 1386 | * or read_status_mask. |
| 1387 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1388 | if (uart_handle_break(port)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | goto ignore_char; |
| 1390 | } else if (lsr & UART_LSR_PE) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1391 | port->icount.parity++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | else if (lsr & UART_LSR_FE) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1393 | port->icount.frame++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | if (lsr & UART_LSR_OE) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1395 | port->icount.overrun++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | |
| 1397 | /* |
Russell King | 23907eb | 2005-04-16 15:26:39 -0700 | [diff] [blame] | 1398 | * Mask off conditions which should be ignored. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1400 | lsr &= port->read_status_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | |
| 1402 | if (lsr & UART_LSR_BI) { |
| 1403 | DEBUG_INTR("handling break...."); |
| 1404 | flag = TTY_BREAK; |
| 1405 | } else if (lsr & UART_LSR_PE) |
| 1406 | flag = TTY_PARITY; |
| 1407 | else if (lsr & UART_LSR_FE) |
| 1408 | flag = TTY_FRAME; |
| 1409 | } |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1410 | if (uart_handle_sysrq_char(port, ch)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | goto ignore_char; |
Russell King | 05ab301 | 2005-05-09 23:21:59 +0100 | [diff] [blame] | 1412 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1413 | uart_insert_char(port, lsr, UART_LSR_OE, ch, flag); |
Russell King | 05ab301 | 2005-05-09 23:21:59 +0100 | [diff] [blame] | 1414 | |
Alan Cox | 6f803cd | 2008-02-08 04:18:52 -0800 | [diff] [blame] | 1415 | ignore_char: |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 1416 | lsr = serial_in(up, UART_LSR); |
Aristeu Rozanski | 7500b1f | 2008-07-23 21:29:45 -0700 | [diff] [blame] | 1417 | } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1418 | spin_unlock(&port->lock); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 1419 | tty_flip_buffer_push(&port->state->port); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1420 | spin_lock(&port->lock); |
Paul Gortmaker | 0690f41 | 2011-12-04 18:42:19 -0500 | [diff] [blame] | 1421 | return lsr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | } |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1423 | EXPORT_SYMBOL_GPL(serial8250_rx_chars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1425 | void serial8250_tx_chars(struct uart_8250_port *up) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | { |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1427 | struct uart_port *port = &up->port; |
| 1428 | struct circ_buf *xmit = &port->state->xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | int count; |
| 1430 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1431 | if (port->x_char) { |
| 1432 | serial_out(up, UART_TX, port->x_char); |
| 1433 | port->icount.tx++; |
| 1434 | port->x_char = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | return; |
| 1436 | } |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1437 | if (uart_tx_stopped(port)) { |
| 1438 | serial8250_stop_tx(port); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 1439 | return; |
| 1440 | } |
| 1441 | if (uart_circ_empty(xmit)) { |
Russell King | e763b90 | 2005-06-29 18:41:51 +0100 | [diff] [blame] | 1442 | __stop_tx(up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | return; |
| 1444 | } |
| 1445 | |
| 1446 | count = up->tx_loadsz; |
| 1447 | do { |
| 1448 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); |
| 1449 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1450 | port->icount.tx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | if (uart_circ_empty(xmit)) |
| 1452 | break; |
Stephen Hurd | ebebd49 | 2013-01-17 14:14:53 -0800 | [diff] [blame] | 1453 | if (up->capabilities & UART_CAP_HFIFO) { |
| 1454 | if ((serial_port_in(port, UART_LSR) & BOTH_EMPTY) != |
| 1455 | BOTH_EMPTY) |
| 1456 | break; |
| 1457 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | } while (--count > 0); |
| 1459 | |
| 1460 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1461 | uart_write_wakeup(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
| 1463 | DEBUG_INTR("THRE..."); |
| 1464 | |
| 1465 | if (uart_circ_empty(xmit)) |
Russell King | e763b90 | 2005-06-29 18:41:51 +0100 | [diff] [blame] | 1466 | __stop_tx(up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | } |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1468 | EXPORT_SYMBOL_GPL(serial8250_tx_chars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1470 | unsigned int serial8250_modem_status(struct uart_8250_port *up) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | { |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1472 | struct uart_port *port = &up->port; |
Russell King | 2af7cd6 | 2006-01-04 16:55:09 +0000 | [diff] [blame] | 1473 | unsigned int status = serial_in(up, UART_MSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1475 | status |= up->msr_saved_flags; |
| 1476 | up->msr_saved_flags = 0; |
Taku Izumi | fdc30b3 | 2007-04-23 14:41:00 -0700 | [diff] [blame] | 1477 | if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1478 | port->state != NULL) { |
Russell King | 2af7cd6 | 2006-01-04 16:55:09 +0000 | [diff] [blame] | 1479 | if (status & UART_MSR_TERI) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1480 | port->icount.rng++; |
Russell King | 2af7cd6 | 2006-01-04 16:55:09 +0000 | [diff] [blame] | 1481 | if (status & UART_MSR_DDSR) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1482 | port->icount.dsr++; |
Russell King | 2af7cd6 | 2006-01-04 16:55:09 +0000 | [diff] [blame] | 1483 | if (status & UART_MSR_DDCD) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1484 | uart_handle_dcd_change(port, status & UART_MSR_DCD); |
Russell King | 2af7cd6 | 2006-01-04 16:55:09 +0000 | [diff] [blame] | 1485 | if (status & UART_MSR_DCTS) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1486 | uart_handle_cts_change(port, status & UART_MSR_CTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1488 | wake_up_interruptible(&port->state->port.delta_msr_wait); |
Russell King | 2af7cd6 | 2006-01-04 16:55:09 +0000 | [diff] [blame] | 1489 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | |
Russell King | 2af7cd6 | 2006-01-04 16:55:09 +0000 | [diff] [blame] | 1491 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | } |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1493 | EXPORT_SYMBOL_GPL(serial8250_modem_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
| 1495 | /* |
| 1496 | * This handles the interrupt from one port. |
| 1497 | */ |
Paul Gortmaker | 86b2119 | 2011-12-04 18:42:22 -0500 | [diff] [blame] | 1498 | int serial8250_handle_irq(struct uart_port *port, unsigned int iir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | { |
Paul Gortmaker | 0690f41 | 2011-12-04 18:42:19 -0500 | [diff] [blame] | 1500 | unsigned char status; |
Jiri Kosina | 4bf3631 | 2007-04-23 14:41:21 -0700 | [diff] [blame] | 1501 | unsigned long flags; |
Paul Gortmaker | 86b2119 | 2011-12-04 18:42:22 -0500 | [diff] [blame] | 1502 | struct uart_8250_port *up = |
| 1503 | container_of(port, struct uart_8250_port, port); |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 1504 | int dma_err = 0; |
Paul Gortmaker | 86b2119 | 2011-12-04 18:42:22 -0500 | [diff] [blame] | 1505 | |
| 1506 | if (iir & UART_IIR_NO_INT) |
| 1507 | return 0; |
Russell King | 45e2460 | 2006-01-04 19:19:06 +0000 | [diff] [blame] | 1508 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1509 | spin_lock_irqsave(&port->lock, flags); |
Russell King | 45e2460 | 2006-01-04 19:19:06 +0000 | [diff] [blame] | 1510 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1511 | status = serial_port_in(port, UART_LSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | |
| 1513 | DEBUG_INTR("status = %x...", status); |
| 1514 | |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 1515 | if (status & (UART_LSR_DR | UART_LSR_BI)) { |
| 1516 | if (up->dma) |
| 1517 | dma_err = serial8250_rx_dma(up, iir); |
| 1518 | |
| 1519 | if (!up->dma || dma_err) |
| 1520 | status = serial8250_rx_chars(up, status); |
| 1521 | } |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1522 | serial8250_modem_status(up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | if (status & UART_LSR_THRE) |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1524 | serial8250_tx_chars(up); |
Russell King | 45e2460 | 2006-01-04 19:19:06 +0000 | [diff] [blame] | 1525 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1526 | spin_unlock_irqrestore(&port->lock, flags); |
Paul Gortmaker | 86b2119 | 2011-12-04 18:42:22 -0500 | [diff] [blame] | 1527 | return 1; |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 1528 | } |
Jamie Iles | c7a1bdc | 2011-08-26 19:04:49 +0100 | [diff] [blame] | 1529 | EXPORT_SYMBOL_GPL(serial8250_handle_irq); |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 1530 | |
| 1531 | static int serial8250_default_handle_irq(struct uart_port *port) |
| 1532 | { |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1533 | unsigned int iir = serial_port_in(port, UART_IIR); |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 1534 | |
| 1535 | return serial8250_handle_irq(port, iir); |
| 1536 | } |
| 1537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | /* |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 1539 | * These Exar UARTs have an extra interrupt indicator that could |
| 1540 | * fire for a few unimplemented interrupts. One of which is a |
| 1541 | * wakeup event when coming out of sleep. Put this here just |
| 1542 | * to be on the safe side that these interrupts don't go unhandled. |
| 1543 | */ |
| 1544 | static int exar_handle_irq(struct uart_port *port) |
| 1545 | { |
| 1546 | unsigned char int0, int1, int2, int3; |
| 1547 | unsigned int iir = serial_port_in(port, UART_IIR); |
| 1548 | int ret; |
| 1549 | |
| 1550 | ret = serial8250_handle_irq(port, iir); |
| 1551 | |
Matt Schulte | 30fa96a | 2012-11-21 09:40:49 -0600 | [diff] [blame] | 1552 | if ((port->type == PORT_XR17V35X) || |
| 1553 | (port->type == PORT_XR17D15X)) { |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 1554 | int0 = serial_port_in(port, 0x80); |
| 1555 | int1 = serial_port_in(port, 0x81); |
| 1556 | int2 = serial_port_in(port, 0x82); |
| 1557 | int3 = serial_port_in(port, 0x83); |
| 1558 | } |
| 1559 | |
| 1560 | return ret; |
| 1561 | } |
| 1562 | |
| 1563 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | * This is the serial driver's interrupt routine. |
| 1565 | * |
| 1566 | * Arjan thinks the old way was overly complex, so it got simplified. |
| 1567 | * Alan disagrees, saying that need the complexity to handle the weird |
| 1568 | * nature of ISA shared interrupts. (This is a special exception.) |
| 1569 | * |
| 1570 | * In order to handle ISA shared interrupts properly, we need to check |
| 1571 | * that all ports have been serviced, and therefore the ISA interrupt |
| 1572 | * line has been de-asserted. |
| 1573 | * |
| 1574 | * This means we need to loop through all ports. checking that they |
| 1575 | * don't have an interrupt pending. |
| 1576 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1577 | static irqreturn_t serial8250_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | { |
| 1579 | struct irq_info *i = dev_id; |
| 1580 | struct list_head *l, *end = NULL; |
| 1581 | int pass_counter = 0, handled = 0; |
| 1582 | |
| 1583 | DEBUG_INTR("serial8250_interrupt(%d)...", irq); |
| 1584 | |
| 1585 | spin_lock(&i->lock); |
| 1586 | |
| 1587 | l = i->head; |
| 1588 | do { |
| 1589 | struct uart_8250_port *up; |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 1590 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | |
| 1592 | up = list_entry(l, struct uart_8250_port, list); |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 1593 | port = &up->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | |
Dan Williams | 49b532f | 2012-04-06 11:49:44 -0700 | [diff] [blame] | 1595 | if (port->handle_irq(port)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | handled = 1; |
Marc St-Jean | beab697 | 2007-05-06 14:48:45 -0700 | [diff] [blame] | 1597 | end = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | } else if (end == NULL) |
| 1599 | end = l; |
| 1600 | |
| 1601 | l = l->next; |
| 1602 | |
| 1603 | if (l == i->head && pass_counter++ > PASS_LIMIT) { |
| 1604 | /* If we hit this, we're dead. */ |
Daniel Drake | cd3ecad | 2010-10-20 16:00:48 -0700 | [diff] [blame] | 1605 | printk_ratelimited(KERN_ERR |
| 1606 | "serial8250: too much work for irq%d\n", irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | break; |
| 1608 | } |
| 1609 | } while (l != end); |
| 1610 | |
| 1611 | spin_unlock(&i->lock); |
| 1612 | |
| 1613 | DEBUG_INTR("end.\n"); |
| 1614 | |
| 1615 | return IRQ_RETVAL(handled); |
| 1616 | } |
| 1617 | |
| 1618 | /* |
| 1619 | * To support ISA shared interrupts, we need to have one interrupt |
| 1620 | * handler that ensures that the IRQ line has been deasserted |
| 1621 | * before returning. Failing to do this will result in the IRQ |
| 1622 | * line being stuck active, and, since ISA irqs are edge triggered, |
| 1623 | * no more IRQs will be seen. |
| 1624 | */ |
| 1625 | static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) |
| 1626 | { |
| 1627 | spin_lock_irq(&i->lock); |
| 1628 | |
| 1629 | if (!list_empty(i->head)) { |
| 1630 | if (i->head == &up->list) |
| 1631 | i->head = i->head->next; |
| 1632 | list_del(&up->list); |
| 1633 | } else { |
| 1634 | BUG_ON(i->head != &up->list); |
| 1635 | i->head = NULL; |
| 1636 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | spin_unlock_irq(&i->lock); |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 1638 | /* List empty so throw away the hash node */ |
| 1639 | if (i->head == NULL) { |
| 1640 | hlist_del(&i->node); |
| 1641 | kfree(i); |
| 1642 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | } |
| 1644 | |
| 1645 | static int serial_link_irq_chain(struct uart_8250_port *up) |
| 1646 | { |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 1647 | struct hlist_head *h; |
| 1648 | struct hlist_node *n; |
| 1649 | struct irq_info *i; |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 1650 | int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 1652 | mutex_lock(&hash_mutex); |
| 1653 | |
| 1654 | h = &irq_lists[up->port.irq % NR_IRQ_HASH]; |
| 1655 | |
| 1656 | hlist_for_each(n, h) { |
| 1657 | i = hlist_entry(n, struct irq_info, node); |
| 1658 | if (i->irq == up->port.irq) |
| 1659 | break; |
| 1660 | } |
| 1661 | |
| 1662 | if (n == NULL) { |
| 1663 | i = kzalloc(sizeof(struct irq_info), GFP_KERNEL); |
| 1664 | if (i == NULL) { |
| 1665 | mutex_unlock(&hash_mutex); |
| 1666 | return -ENOMEM; |
| 1667 | } |
| 1668 | spin_lock_init(&i->lock); |
| 1669 | i->irq = up->port.irq; |
| 1670 | hlist_add_head(&i->node, h); |
| 1671 | } |
| 1672 | mutex_unlock(&hash_mutex); |
| 1673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | spin_lock_irq(&i->lock); |
| 1675 | |
| 1676 | if (i->head) { |
| 1677 | list_add(&up->list, i->head); |
| 1678 | spin_unlock_irq(&i->lock); |
| 1679 | |
| 1680 | ret = 0; |
| 1681 | } else { |
| 1682 | INIT_LIST_HEAD(&up->list); |
| 1683 | i->head = &up->list; |
| 1684 | spin_unlock_irq(&i->lock); |
Vikram Pandita | 1c2f049 | 2009-09-19 13:13:19 -0700 | [diff] [blame] | 1685 | irq_flags |= up->port.irqflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | ret = request_irq(up->port.irq, serial8250_interrupt, |
| 1687 | irq_flags, "serial", i); |
| 1688 | if (ret < 0) |
| 1689 | serial_do_unlink(i, up); |
| 1690 | } |
| 1691 | |
| 1692 | return ret; |
| 1693 | } |
| 1694 | |
| 1695 | static void serial_unlink_irq_chain(struct uart_8250_port *up) |
| 1696 | { |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 1697 | struct irq_info *i; |
| 1698 | struct hlist_node *n; |
| 1699 | struct hlist_head *h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 1701 | mutex_lock(&hash_mutex); |
| 1702 | |
| 1703 | h = &irq_lists[up->port.irq % NR_IRQ_HASH]; |
| 1704 | |
| 1705 | hlist_for_each(n, h) { |
| 1706 | i = hlist_entry(n, struct irq_info, node); |
| 1707 | if (i->irq == up->port.irq) |
| 1708 | break; |
| 1709 | } |
| 1710 | |
| 1711 | BUG_ON(n == NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | BUG_ON(i->head == NULL); |
| 1713 | |
| 1714 | if (list_empty(i->head)) |
| 1715 | free_irq(up->port.irq, i); |
| 1716 | |
| 1717 | serial_do_unlink(i, up); |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 1718 | mutex_unlock(&hash_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | } |
| 1720 | |
| 1721 | /* |
| 1722 | * This function is used to handle ports that do not have an |
| 1723 | * interrupt. This doesn't work very well for 16450's, but gives |
| 1724 | * barely passable results for a 16550A. (Although at the expense |
| 1725 | * of much CPU overhead). |
| 1726 | */ |
| 1727 | static void serial8250_timeout(unsigned long data) |
| 1728 | { |
| 1729 | struct uart_8250_port *up = (struct uart_8250_port *)data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | |
Paul Gortmaker | a043147 | 2011-12-04 18:42:21 -0500 | [diff] [blame] | 1731 | up->port.handle_irq(&up->port); |
Anton Vorontsov | 5438106 | 2010-10-01 17:21:25 +0400 | [diff] [blame] | 1732 | mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1733 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1735 | static void serial8250_backup_timeout(unsigned long data) |
| 1736 | { |
| 1737 | struct uart_8250_port *up = (struct uart_8250_port *)data; |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1738 | unsigned int iir, ier = 0, lsr; |
| 1739 | unsigned long flags; |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1740 | |
Al Cooper | dbb3b1c | 2011-07-25 16:19:52 -0400 | [diff] [blame] | 1741 | spin_lock_irqsave(&up->port.lock, flags); |
| 1742 | |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1743 | /* |
| 1744 | * Must disable interrupts or else we risk racing with the interrupt |
| 1745 | * based handler. |
| 1746 | */ |
Alan Cox | d4e33fa | 2012-01-26 17:44:09 +0000 | [diff] [blame] | 1747 | if (up->port.irq) { |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1748 | ier = serial_in(up, UART_IER); |
| 1749 | serial_out(up, UART_IER, 0); |
| 1750 | } |
| 1751 | |
| 1752 | iir = serial_in(up, UART_IIR); |
| 1753 | |
| 1754 | /* |
| 1755 | * This should be a safe test for anyone who doesn't trust the |
| 1756 | * IIR bits on their UART, but it's specifically designed for |
| 1757 | * the "Diva" UART used on the management processor on many HP |
| 1758 | * ia64 and parisc boxes. |
| 1759 | */ |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1760 | lsr = serial_in(up, UART_LSR); |
| 1761 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1762 | if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1763 | (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1764 | (lsr & UART_LSR_THRE)) { |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1765 | iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); |
| 1766 | iir |= UART_IIR_THRI; |
| 1767 | } |
| 1768 | |
| 1769 | if (!(iir & UART_IIR_NO_INT)) |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1770 | serial8250_tx_chars(up); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1771 | |
Alan Cox | d4e33fa | 2012-01-26 17:44:09 +0000 | [diff] [blame] | 1772 | if (up->port.irq) |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1773 | serial_out(up, UART_IER, ier); |
| 1774 | |
Al Cooper | dbb3b1c | 2011-07-25 16:19:52 -0400 | [diff] [blame] | 1775 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 1776 | |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1777 | /* Standard timer interval plus 0.2s to keep the port running */ |
Alan Cox | 6f803cd | 2008-02-08 04:18:52 -0800 | [diff] [blame] | 1778 | mod_timer(&up->timer, |
Anton Vorontsov | 5438106 | 2010-10-01 17:21:25 +0400 | [diff] [blame] | 1779 | jiffies + uart_poll_timeout(&up->port) + HZ / 5); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | } |
| 1781 | |
| 1782 | static unsigned int serial8250_tx_empty(struct uart_port *port) |
| 1783 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1784 | struct uart_8250_port *up = |
| 1785 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | unsigned long flags; |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1787 | unsigned int lsr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1789 | spin_lock_irqsave(&port->lock, flags); |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1790 | lsr = serial_port_in(port, UART_LSR); |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1791 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1792 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | |
Dick Hollenbeck | bca4761 | 2009-12-09 12:31:34 -0800 | [diff] [blame] | 1794 | return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | } |
| 1796 | |
| 1797 | static unsigned int serial8250_get_mctrl(struct uart_port *port) |
| 1798 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1799 | struct uart_8250_port *up = |
| 1800 | container_of(port, struct uart_8250_port, port); |
Russell King | 2af7cd6 | 2006-01-04 16:55:09 +0000 | [diff] [blame] | 1801 | unsigned int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | unsigned int ret; |
| 1803 | |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 1804 | status = serial8250_modem_status(up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | |
| 1806 | ret = 0; |
| 1807 | if (status & UART_MSR_DCD) |
| 1808 | ret |= TIOCM_CAR; |
| 1809 | if (status & UART_MSR_RI) |
| 1810 | ret |= TIOCM_RNG; |
| 1811 | if (status & UART_MSR_DSR) |
| 1812 | ret |= TIOCM_DSR; |
| 1813 | if (status & UART_MSR_CTS) |
| 1814 | ret |= TIOCM_CTS; |
| 1815 | return ret; |
| 1816 | } |
| 1817 | |
| 1818 | static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 1819 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1820 | struct uart_8250_port *up = |
| 1821 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | unsigned char mcr = 0; |
| 1823 | |
| 1824 | if (mctrl & TIOCM_RTS) |
| 1825 | mcr |= UART_MCR_RTS; |
| 1826 | if (mctrl & TIOCM_DTR) |
| 1827 | mcr |= UART_MCR_DTR; |
| 1828 | if (mctrl & TIOCM_OUT1) |
| 1829 | mcr |= UART_MCR_OUT1; |
| 1830 | if (mctrl & TIOCM_OUT2) |
| 1831 | mcr |= UART_MCR_OUT2; |
| 1832 | if (mctrl & TIOCM_LOOP) |
| 1833 | mcr |= UART_MCR_LOOP; |
| 1834 | |
| 1835 | mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr; |
| 1836 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1837 | serial_port_out(port, UART_MCR, mcr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | } |
| 1839 | |
| 1840 | static void serial8250_break_ctl(struct uart_port *port, int break_state) |
| 1841 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1842 | struct uart_8250_port *up = |
| 1843 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | unsigned long flags; |
| 1845 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1846 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | if (break_state == -1) |
| 1848 | up->lcr |= UART_LCR_SBC; |
| 1849 | else |
| 1850 | up->lcr &= ~UART_LCR_SBC; |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1851 | serial_port_out(port, UART_LCR, up->lcr); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1852 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | } |
| 1854 | |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1855 | /* |
| 1856 | * Wait for transmitter & holding register to empty |
| 1857 | */ |
Will Newton | b5d674a | 2008-10-13 10:36:21 +0100 | [diff] [blame] | 1858 | static void wait_for_xmitr(struct uart_8250_port *up, int bits) |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1859 | { |
| 1860 | unsigned int status, tmout = 10000; |
| 1861 | |
| 1862 | /* Wait up to 10ms for the character(s) to be sent. */ |
David Daney | 97d303b | 2010-10-05 11:40:07 -0700 | [diff] [blame] | 1863 | for (;;) { |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1864 | status = serial_in(up, UART_LSR); |
| 1865 | |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1866 | up->lsr_saved_flags |= status & LSR_SAVE_FLAGS; |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1867 | |
David Daney | 97d303b | 2010-10-05 11:40:07 -0700 | [diff] [blame] | 1868 | if ((status & bits) == bits) |
| 1869 | break; |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1870 | if (--tmout == 0) |
| 1871 | break; |
| 1872 | udelay(1); |
David Daney | 97d303b | 2010-10-05 11:40:07 -0700 | [diff] [blame] | 1873 | } |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1874 | |
| 1875 | /* Wait up to 1s for flow control if necessary */ |
| 1876 | if (up->port.flags & UPF_CONS_FLOW) { |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 1877 | unsigned int tmout; |
| 1878 | for (tmout = 1000000; tmout; tmout--) { |
| 1879 | unsigned int msr = serial_in(up, UART_MSR); |
| 1880 | up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; |
| 1881 | if (msr & UART_MSR_CTS) |
| 1882 | break; |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 1883 | udelay(1); |
| 1884 | touch_nmi_watchdog(); |
| 1885 | } |
| 1886 | } |
| 1887 | } |
| 1888 | |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1889 | #ifdef CONFIG_CONSOLE_POLL |
| 1890 | /* |
| 1891 | * Console polling routines for writing and reading from the uart while |
| 1892 | * in an interrupt or debug context. |
| 1893 | */ |
| 1894 | |
| 1895 | static int serial8250_get_poll_char(struct uart_port *port) |
| 1896 | { |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1897 | unsigned char lsr = serial_port_in(port, UART_LSR); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1898 | |
Jason Wessel | f5316b4 | 2010-05-20 21:04:22 -0500 | [diff] [blame] | 1899 | if (!(lsr & UART_LSR_DR)) |
| 1900 | return NO_POLL_CHAR; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1901 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1902 | return serial_port_in(port, UART_RX); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1903 | } |
| 1904 | |
| 1905 | |
| 1906 | static void serial8250_put_poll_char(struct uart_port *port, |
| 1907 | unsigned char c) |
| 1908 | { |
| 1909 | unsigned int ier; |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1910 | struct uart_8250_port *up = |
| 1911 | container_of(port, struct uart_8250_port, port); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1912 | |
| 1913 | /* |
| 1914 | * First save the IER then disable the interrupts |
| 1915 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1916 | ier = serial_port_in(port, UART_IER); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1917 | if (up->capabilities & UART_CAP_UUE) |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1918 | serial_port_out(port, UART_IER, UART_IER_UUE); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1919 | else |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1920 | serial_port_out(port, UART_IER, 0); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1921 | |
| 1922 | wait_for_xmitr(up, BOTH_EMPTY); |
| 1923 | /* |
| 1924 | * Send the character out. |
| 1925 | * If a LF, also do CR... |
| 1926 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1927 | serial_port_out(port, UART_TX, c); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1928 | if (c == 10) { |
| 1929 | wait_for_xmitr(up, BOTH_EMPTY); |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1930 | serial_port_out(port, UART_TX, 13); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1931 | } |
| 1932 | |
| 1933 | /* |
| 1934 | * Finally, wait for transmitter to become empty |
| 1935 | * and restore the IER |
| 1936 | */ |
| 1937 | wait_for_xmitr(up, BOTH_EMPTY); |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1938 | serial_port_out(port, UART_IER, ier); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1939 | } |
| 1940 | |
| 1941 | #endif /* CONFIG_CONSOLE_POLL */ |
| 1942 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | static int serial8250_startup(struct uart_port *port) |
| 1944 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 1945 | struct uart_8250_port *up = |
| 1946 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | unsigned long flags; |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 1948 | unsigned char lsr, iir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | int retval; |
| 1950 | |
Sean Young | 65ecc9c | 2012-09-07 19:06:24 +0100 | [diff] [blame] | 1951 | if (port->type == PORT_8250_CIR) |
| 1952 | return -ENODEV; |
| 1953 | |
Heikki Krogerus | 9660497 | 2013-01-10 11:25:05 +0200 | [diff] [blame] | 1954 | if (!port->fifosize) |
| 1955 | port->fifosize = uart_config[port->type].fifo_size; |
| 1956 | if (!up->tx_loadsz) |
| 1957 | up->tx_loadsz = uart_config[port->type].tx_loadsz; |
| 1958 | if (!up->capabilities) |
| 1959 | up->capabilities = uart_config[port->type].flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | up->mcr = 0; |
| 1961 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1962 | if (port->iotype != up->cur_iotype) |
Alan Cox | b8e7e40 | 2009-05-28 14:01:35 +0100 | [diff] [blame] | 1963 | set_io_from_upio(port); |
| 1964 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 1965 | if (port->type == PORT_16C950) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | /* Wake up and initialize UART */ |
| 1967 | up->acr = 0; |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1968 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
| 1969 | serial_port_out(port, UART_EFR, UART_EFR_ECB); |
| 1970 | serial_port_out(port, UART_IER, 0); |
| 1971 | serial_port_out(port, UART_LCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | serial_icr_write(up, UART_CSR, 0); /* Reset the UART */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1973 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
| 1974 | serial_port_out(port, UART_EFR, UART_EFR_ECB); |
| 1975 | serial_port_out(port, UART_LCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | } |
| 1977 | |
| 1978 | #ifdef CONFIG_SERIAL_8250_RSA |
| 1979 | /* |
| 1980 | * If this is an RSA port, see if we can kick it up to the |
| 1981 | * higher speed clock. |
| 1982 | */ |
| 1983 | enable_rsa(up); |
| 1984 | #endif |
| 1985 | |
| 1986 | /* |
| 1987 | * Clear the FIFO buffers and disable them. |
Alexey Dobriyan | 7f927fc | 2006-03-28 01:56:53 -0800 | [diff] [blame] | 1988 | * (they will be reenabled in set_termios()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | */ |
| 1990 | serial8250_clear_fifos(up); |
| 1991 | |
| 1992 | /* |
| 1993 | * Clear the interrupt registers. |
| 1994 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 1995 | serial_port_in(port, UART_LSR); |
| 1996 | serial_port_in(port, UART_RX); |
| 1997 | serial_port_in(port, UART_IIR); |
| 1998 | serial_port_in(port, UART_MSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | |
| 2000 | /* |
| 2001 | * At this point, there's no way the LSR could still be 0xff; |
| 2002 | * if it is, then bail out, because there's likely no UART |
| 2003 | * here. |
| 2004 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2005 | if (!(port->flags & UPF_BUGGY_UART) && |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2006 | (serial_port_in(port, UART_LSR) == 0xff)) { |
Konrad Rzeszutek Wilk | 7808a4c | 2011-09-26 09:14:34 -0400 | [diff] [blame] | 2007 | printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n", |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2008 | serial_index(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | return -ENODEV; |
| 2010 | } |
| 2011 | |
| 2012 | /* |
| 2013 | * For a XR16C850, we need to set the trigger levels |
| 2014 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2015 | if (port->type == PORT_16850) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | unsigned char fctr; |
| 2017 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 2018 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | |
Paul Gortmaker | 0acf519 | 2012-03-08 19:12:08 -0500 | [diff] [blame] | 2020 | fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX); |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2021 | serial_port_out(port, UART_FCTR, |
| 2022 | fctr | UART_FCTR_TRGD | UART_FCTR_RX); |
| 2023 | serial_port_out(port, UART_TRG, UART_TRG_96); |
| 2024 | serial_port_out(port, UART_FCTR, |
| 2025 | fctr | UART_FCTR_TRGD | UART_FCTR_TX); |
| 2026 | serial_port_out(port, UART_TRG, UART_TRG_96); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2028 | serial_port_out(port, UART_LCR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | } |
| 2030 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2031 | if (port->irq) { |
Alex Williamson | 01c194d | 2008-04-28 02:14:09 -0700 | [diff] [blame] | 2032 | unsigned char iir1; |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2033 | /* |
| 2034 | * Test for UARTs that do not reassert THRE when the |
| 2035 | * transmitter is idle and the interrupt has already |
| 2036 | * been cleared. Real 16550s should always reassert |
| 2037 | * this interrupt whenever the transmitter is idle and |
| 2038 | * the interrupt is enabled. Delays are necessary to |
| 2039 | * allow register changes to become visible. |
| 2040 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2041 | spin_lock_irqsave(&port->lock, flags); |
Vikram Pandita | 1c2f049 | 2009-09-19 13:13:19 -0700 | [diff] [blame] | 2042 | if (up->port.irqflags & IRQF_SHARED) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2043 | disable_irq_nosync(port->irq); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2044 | |
| 2045 | wait_for_xmitr(up, UART_LSR_THRE); |
Paul Gortmaker | 55e4016 | 2012-03-08 19:12:14 -0500 | [diff] [blame] | 2046 | serial_port_out_sync(port, UART_IER, UART_IER_THRI); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2047 | udelay(1); /* allow THRE to set */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2048 | iir1 = serial_port_in(port, UART_IIR); |
| 2049 | serial_port_out(port, UART_IER, 0); |
Paul Gortmaker | 55e4016 | 2012-03-08 19:12:14 -0500 | [diff] [blame] | 2050 | serial_port_out_sync(port, UART_IER, UART_IER_THRI); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2051 | udelay(1); /* allow a working UART time to re-assert THRE */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2052 | iir = serial_port_in(port, UART_IIR); |
| 2053 | serial_port_out(port, UART_IER, 0); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2054 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2055 | if (port->irqflags & IRQF_SHARED) |
| 2056 | enable_irq(port->irq); |
| 2057 | spin_unlock_irqrestore(&port->lock, flags); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2058 | |
| 2059 | /* |
Dan Williams | bc02d15 | 2012-04-06 11:49:50 -0700 | [diff] [blame] | 2060 | * If the interrupt is not reasserted, or we otherwise |
| 2061 | * don't trust the iir, setup a timer to kick the UART |
| 2062 | * on a regular basis. |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2063 | */ |
Dan Williams | bc02d15 | 2012-04-06 11:49:50 -0700 | [diff] [blame] | 2064 | if ((!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) || |
| 2065 | up->port.flags & UPF_BUG_THRE) { |
Will Newton | 363f66f | 2008-09-02 14:35:44 -0700 | [diff] [blame] | 2066 | up->bugs |= UART_BUG_THRE; |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 2067 | pr_debug("ttyS%d - using backup timer\n", |
| 2068 | serial_index(port)); |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2069 | } |
| 2070 | } |
| 2071 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | /* |
Will Newton | 363f66f | 2008-09-02 14:35:44 -0700 | [diff] [blame] | 2073 | * The above check will only give an accurate result the first time |
| 2074 | * the port is opened so this value needs to be preserved. |
| 2075 | */ |
| 2076 | if (up->bugs & UART_BUG_THRE) { |
| 2077 | up->timer.function = serial8250_backup_timeout; |
| 2078 | up->timer.data = (unsigned long)up; |
| 2079 | mod_timer(&up->timer, jiffies + |
Anton Vorontsov | 5438106 | 2010-10-01 17:21:25 +0400 | [diff] [blame] | 2080 | uart_poll_timeout(port) + HZ / 5); |
Will Newton | 363f66f | 2008-09-02 14:35:44 -0700 | [diff] [blame] | 2081 | } |
| 2082 | |
| 2083 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | * If the "interrupt" for this port doesn't correspond with any |
| 2085 | * hardware interrupt, we use a timer-based system. The original |
| 2086 | * driver used to do this with IRQ0. |
| 2087 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2088 | if (!port->irq) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | up->timer.data = (unsigned long)up; |
Anton Vorontsov | 5438106 | 2010-10-01 17:21:25 +0400 | [diff] [blame] | 2090 | mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | } else { |
| 2092 | retval = serial_link_irq_chain(up); |
| 2093 | if (retval) |
| 2094 | return retval; |
| 2095 | } |
| 2096 | |
| 2097 | /* |
| 2098 | * Now, initialize the UART |
| 2099 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2100 | serial_port_out(port, UART_LCR, UART_LCR_WLEN8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2102 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | if (up->port.flags & UPF_FOURPORT) { |
Alan Cox | d4e33fa | 2012-01-26 17:44:09 +0000 | [diff] [blame] | 2104 | if (!up->port.irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | up->port.mctrl |= TIOCM_OUT1; |
| 2106 | } else |
| 2107 | /* |
| 2108 | * Most PC uarts need OUT2 raised to enable interrupts. |
| 2109 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2110 | if (port->irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | up->port.mctrl |= TIOCM_OUT2; |
| 2112 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2113 | serial8250_set_mctrl(port, port->mctrl); |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 2114 | |
Mauro Carvalho Chehab | b6adea3 | 2009-02-20 15:38:52 -0800 | [diff] [blame] | 2115 | /* Serial over Lan (SoL) hack: |
| 2116 | Intel 8257x Gigabit ethernet chips have a |
| 2117 | 16550 emulation, to be used for Serial Over Lan. |
| 2118 | Those chips take a longer time than a normal |
| 2119 | serial device to signalize that a transmission |
| 2120 | data was queued. Due to that, the above test generally |
| 2121 | fails. One solution would be to delay the reading of |
| 2122 | iir. However, this is not reliable, since the timeout |
| 2123 | is variable. So, let's just don't test if we receive |
| 2124 | TX irq. This way, we'll never enable UART_BUG_TXEN. |
| 2125 | */ |
Chuck Ebbert | d41a4b5 | 2009-10-01 15:44:26 -0700 | [diff] [blame] | 2126 | if (skip_txen_test || up->port.flags & UPF_NO_TXEN_TEST) |
Mauro Carvalho Chehab | b6adea3 | 2009-02-20 15:38:52 -0800 | [diff] [blame] | 2127 | goto dont_test_tx_en; |
| 2128 | |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 2129 | /* |
| 2130 | * Do a quick test to see if we receive an |
| 2131 | * interrupt when we enable the TX irq. |
| 2132 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2133 | serial_port_out(port, UART_IER, UART_IER_THRI); |
| 2134 | lsr = serial_port_in(port, UART_LSR); |
| 2135 | iir = serial_port_in(port, UART_IIR); |
| 2136 | serial_port_out(port, UART_IER, 0); |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 2137 | |
| 2138 | if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) { |
Russell King | 67f7654 | 2005-06-23 22:26:43 +0100 | [diff] [blame] | 2139 | if (!(up->bugs & UART_BUG_TXEN)) { |
| 2140 | up->bugs |= UART_BUG_TXEN; |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 2141 | pr_debug("ttyS%d - enabling bad tx status workarounds\n", |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 2142 | serial_index(port)); |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 2143 | } |
| 2144 | } else { |
Russell King | 67f7654 | 2005-06-23 22:26:43 +0100 | [diff] [blame] | 2145 | up->bugs &= ~UART_BUG_TXEN; |
Russell King | 55d3b28 | 2005-06-23 15:05:41 +0100 | [diff] [blame] | 2146 | } |
| 2147 | |
Mauro Carvalho Chehab | b6adea3 | 2009-02-20 15:38:52 -0800 | [diff] [blame] | 2148 | dont_test_tx_en: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2149 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | |
| 2151 | /* |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 2152 | * Clear the interrupt registers again for luck, and clear the |
| 2153 | * saved flags to avoid getting false values from polling |
| 2154 | * routines or the previous session. |
| 2155 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2156 | serial_port_in(port, UART_LSR); |
| 2157 | serial_port_in(port, UART_RX); |
| 2158 | serial_port_in(port, UART_IIR); |
| 2159 | serial_port_in(port, UART_MSR); |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 2160 | up->lsr_saved_flags = 0; |
| 2161 | up->msr_saved_flags = 0; |
| 2162 | |
| 2163 | /* |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 2164 | * Request DMA channels for both RX and TX. |
| 2165 | */ |
| 2166 | if (up->dma) { |
| 2167 | retval = serial8250_request_dma(up); |
| 2168 | if (retval) { |
| 2169 | pr_warn_ratelimited("ttyS%d - failed to request DMA\n", |
| 2170 | serial_index(port)); |
| 2171 | up->dma = NULL; |
| 2172 | } |
| 2173 | } |
| 2174 | |
| 2175 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | * Finally, enable interrupts. Note: Modem status interrupts |
| 2177 | * are set via set_termios(), which will be occurring imminently |
| 2178 | * anyway, so we don't enable them here. |
| 2179 | */ |
| 2180 | up->ier = UART_IER_RLSI | UART_IER_RDI; |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2181 | serial_port_out(port, UART_IER, up->ier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2183 | if (port->flags & UPF_FOURPORT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | unsigned int icp; |
| 2185 | /* |
| 2186 | * Enable interrupts on the AST Fourport board |
| 2187 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2188 | icp = (port->iobase & 0xfe0) | 0x01f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | outb_p(0x80, icp); |
Paul Gortmaker | 0d263a2 | 2012-03-08 19:12:10 -0500 | [diff] [blame] | 2190 | inb_p(icp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | } |
| 2192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | return 0; |
| 2194 | } |
| 2195 | |
| 2196 | static void serial8250_shutdown(struct uart_port *port) |
| 2197 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 2198 | struct uart_8250_port *up = |
| 2199 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | unsigned long flags; |
| 2201 | |
| 2202 | /* |
| 2203 | * Disable interrupts from this port |
| 2204 | */ |
| 2205 | up->ier = 0; |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2206 | serial_port_out(port, UART_IER, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 2208 | if (up->dma) |
| 2209 | serial8250_release_dma(up); |
| 2210 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2211 | spin_lock_irqsave(&port->lock, flags); |
| 2212 | if (port->flags & UPF_FOURPORT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | /* reset interrupts on the AST Fourport board */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2214 | inb((port->iobase & 0xfe0) | 0x1f); |
| 2215 | port->mctrl |= TIOCM_OUT1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | } else |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2217 | port->mctrl &= ~TIOCM_OUT2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2219 | serial8250_set_mctrl(port, port->mctrl); |
| 2220 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | |
| 2222 | /* |
| 2223 | * Disable break condition and FIFOs |
| 2224 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2225 | serial_port_out(port, UART_LCR, |
| 2226 | serial_port_in(port, UART_LCR) & ~UART_LCR_SBC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | serial8250_clear_fifos(up); |
| 2228 | |
| 2229 | #ifdef CONFIG_SERIAL_8250_RSA |
| 2230 | /* |
| 2231 | * Reset the RSA board back to 115kbps compat mode. |
| 2232 | */ |
| 2233 | disable_rsa(up); |
| 2234 | #endif |
| 2235 | |
| 2236 | /* |
| 2237 | * Read data port to reset things, and then unlink from |
| 2238 | * the IRQ chain. |
| 2239 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2240 | serial_port_in(port, UART_RX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2241 | |
Alex Williamson | 40b36da | 2007-02-14 00:33:04 -0800 | [diff] [blame] | 2242 | del_timer_sync(&up->timer); |
| 2243 | up->timer.function = serial8250_timeout; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2244 | if (port->irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | serial_unlink_irq_chain(up); |
| 2246 | } |
| 2247 | |
| 2248 | static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud) |
| 2249 | { |
| 2250 | unsigned int quot; |
| 2251 | |
| 2252 | /* |
| 2253 | * Handle magic divisors for baud rates above baud_base on |
| 2254 | * SMSC SuperIO chips. |
| 2255 | */ |
| 2256 | if ((port->flags & UPF_MAGIC_MULTIPLIER) && |
| 2257 | baud == (port->uartclk/4)) |
| 2258 | quot = 0x8001; |
| 2259 | else if ((port->flags & UPF_MAGIC_MULTIPLIER) && |
| 2260 | baud == (port->uartclk/8)) |
| 2261 | quot = 0x8002; |
| 2262 | else |
| 2263 | quot = uart_get_divisor(port, baud); |
| 2264 | |
| 2265 | return quot; |
| 2266 | } |
| 2267 | |
Philippe Langlais | 235dae5 | 2010-07-29 17:13:57 +0200 | [diff] [blame] | 2268 | void |
| 2269 | serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, |
| 2270 | struct ktermios *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 2272 | struct uart_8250_port *up = |
| 2273 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | unsigned char cval, fcr = 0; |
| 2275 | unsigned long flags; |
| 2276 | unsigned int baud, quot; |
Alan Cox | eb26dfe | 2012-07-12 13:00:31 +0100 | [diff] [blame] | 2277 | int fifo_bug = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | |
| 2279 | switch (termios->c_cflag & CSIZE) { |
| 2280 | case CS5: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 2281 | cval = UART_LCR_WLEN5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | break; |
| 2283 | case CS6: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 2284 | cval = UART_LCR_WLEN6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | break; |
| 2286 | case CS7: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 2287 | cval = UART_LCR_WLEN7; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | break; |
| 2289 | default: |
| 2290 | case CS8: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 2291 | cval = UART_LCR_WLEN8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | break; |
| 2293 | } |
| 2294 | |
| 2295 | if (termios->c_cflag & CSTOPB) |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 2296 | cval |= UART_LCR_STOP; |
Alan Cox | eb26dfe | 2012-07-12 13:00:31 +0100 | [diff] [blame] | 2297 | if (termios->c_cflag & PARENB) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | cval |= UART_LCR_PARITY; |
Alan Cox | eb26dfe | 2012-07-12 13:00:31 +0100 | [diff] [blame] | 2299 | if (up->bugs & UART_BUG_PARITY) |
| 2300 | fifo_bug = 1; |
| 2301 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | if (!(termios->c_cflag & PARODD)) |
| 2303 | cval |= UART_LCR_EPAR; |
| 2304 | #ifdef CMSPAR |
| 2305 | if (termios->c_cflag & CMSPAR) |
| 2306 | cval |= UART_LCR_SPAR; |
| 2307 | #endif |
| 2308 | |
| 2309 | /* |
| 2310 | * Ask the core to calculate the divisor for us. |
| 2311 | */ |
Anton Vorontsov | 24d481e | 2009-09-19 13:13:20 -0700 | [diff] [blame] | 2312 | baud = uart_get_baud_rate(port, termios, old, |
| 2313 | port->uartclk / 16 / 0xffff, |
| 2314 | port->uartclk / 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | quot = serial8250_get_divisor(port, baud); |
| 2316 | |
| 2317 | /* |
Russell King | 4ba5e35 | 2005-06-23 10:43:04 +0100 | [diff] [blame] | 2318 | * Oxford Semi 952 rev B workaround |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | */ |
Russell King | 4ba5e35 | 2005-06-23 10:43:04 +0100 | [diff] [blame] | 2320 | if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0) |
Alan Cox | 3e8d4e2 | 2008-02-04 22:27:53 -0800 | [diff] [blame] | 2321 | quot++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2323 | if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) { |
Christian Melki | f9a9111 | 2012-04-30 11:21:26 +0200 | [diff] [blame] | 2324 | fcr = uart_config[port->type].fcr; |
Heikki Krogerus | 2797f6f | 2013-09-05 17:34:52 +0300 | [diff] [blame] | 2325 | if ((baud < 2400 && !up->dma) || fifo_bug) { |
Christian Melki | f9a9111 | 2012-04-30 11:21:26 +0200 | [diff] [blame] | 2326 | fcr &= ~UART_FCR_TRIGGER_MASK; |
| 2327 | fcr |= UART_FCR_TRIGGER_1; |
| 2328 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | } |
| 2330 | |
| 2331 | /* |
| 2332 | * MCR-based auto flow control. When AFE is enabled, RTS will be |
| 2333 | * deasserted when the receive FIFO contains more characters than |
| 2334 | * the trigger, or the MCR RTS bit is cleared. In the case where |
| 2335 | * the remote UART is not using CTS auto flow control, we must |
| 2336 | * have sufficient FIFO entries for the latency of the remote |
| 2337 | * UART to respond. IOW, at least 32 bytes of FIFO. |
| 2338 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2339 | if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | up->mcr &= ~UART_MCR_AFE; |
| 2341 | if (termios->c_cflag & CRTSCTS) |
| 2342 | up->mcr |= UART_MCR_AFE; |
| 2343 | } |
| 2344 | |
| 2345 | /* |
| 2346 | * Ok, we're now changing the port state. Do it with |
| 2347 | * interrupts disabled. |
| 2348 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2349 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | |
| 2351 | /* |
| 2352 | * Update the per-port timeout. |
| 2353 | */ |
| 2354 | uart_update_timeout(port, termios->c_cflag, baud); |
| 2355 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2356 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2357 | if (termios->c_iflag & INPCK) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2358 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2359 | if (termios->c_iflag & (BRKINT | PARMRK)) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2360 | port->read_status_mask |= UART_LSR_BI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | |
| 2362 | /* |
| 2363 | * Characteres to ignore |
| 2364 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2365 | port->ignore_status_mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | if (termios->c_iflag & IGNPAR) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2367 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | if (termios->c_iflag & IGNBRK) { |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2369 | port->ignore_status_mask |= UART_LSR_BI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | /* |
| 2371 | * If we're ignoring parity and break indicators, |
| 2372 | * ignore overruns too (for real raw support). |
| 2373 | */ |
| 2374 | if (termios->c_iflag & IGNPAR) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2375 | port->ignore_status_mask |= UART_LSR_OE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2376 | } |
| 2377 | |
| 2378 | /* |
| 2379 | * ignore all characters if CREAD is not set |
| 2380 | */ |
| 2381 | if ((termios->c_cflag & CREAD) == 0) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2382 | port->ignore_status_mask |= UART_LSR_DR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | |
| 2384 | /* |
| 2385 | * CTS flow control flag and modem status interrupts |
| 2386 | */ |
Ingo Molnar | f8b372a | 2010-11-13 16:21:58 +0100 | [diff] [blame] | 2387 | up->ier &= ~UART_IER_MSI; |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 2388 | if (!(up->bugs & UART_BUG_NOMSR) && |
| 2389 | UART_ENABLE_MS(&up->port, termios->c_cflag)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | up->ier |= UART_IER_MSI; |
| 2391 | if (up->capabilities & UART_CAP_UUE) |
Stephen Warren | 4539c24 | 2011-05-17 16:12:36 -0600 | [diff] [blame] | 2392 | up->ier |= UART_IER_UUE; |
| 2393 | if (up->capabilities & UART_CAP_RTOIE) |
| 2394 | up->ier |= UART_IER_RTOIE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2395 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2396 | serial_port_out(port, UART_IER, up->ier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2397 | |
| 2398 | if (up->capabilities & UART_CAP_EFR) { |
| 2399 | unsigned char efr = 0; |
| 2400 | /* |
| 2401 | * TI16C752/Startech hardware flow control. FIXME: |
| 2402 | * - TI16C752 requires control thresholds to be set. |
| 2403 | * - UART_MCR_RTS is ineffective if auto-RTS mode is enabled. |
| 2404 | */ |
| 2405 | if (termios->c_cflag & CRTSCTS) |
| 2406 | efr |= UART_EFR_CTS; |
| 2407 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2408 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2409 | if (port->flags & UPF_EXAR_EFR) |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2410 | serial_port_out(port, UART_XR_EFR, efr); |
Søren Holm | 0631534 | 2011-09-02 22:55:37 +0200 | [diff] [blame] | 2411 | else |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2412 | serial_port_out(port, UART_EFR, efr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | } |
| 2414 | |
Jonathan McDowell | 255341c | 2006-08-14 23:05:32 -0700 | [diff] [blame] | 2415 | /* Workaround to enable 115200 baud on OMAP1510 internal ports */ |
Tony Lindgren | 54ec52b | 2012-10-03 15:31:58 -0700 | [diff] [blame] | 2416 | if (is_omap1510_8250(up)) { |
Jonathan McDowell | 255341c | 2006-08-14 23:05:32 -0700 | [diff] [blame] | 2417 | if (baud == 115200) { |
| 2418 | quot = 1; |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2419 | serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1); |
Jonathan McDowell | 255341c | 2006-08-14 23:05:32 -0700 | [diff] [blame] | 2420 | } else |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2421 | serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0); |
Jonathan McDowell | 255341c | 2006-08-14 23:05:32 -0700 | [diff] [blame] | 2422 | } |
Jonathan McDowell | 255341c | 2006-08-14 23:05:32 -0700 | [diff] [blame] | 2423 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2424 | /* |
| 2425 | * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2, |
| 2426 | * otherwise just set DLAB |
| 2427 | */ |
| 2428 | if (up->capabilities & UART_NATSEMI) |
| 2429 | serial_port_out(port, UART_LCR, 0xe0); |
| 2430 | else |
| 2431 | serial_port_out(port, UART_LCR, cval | UART_LCR_DLAB); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2432 | |
Jon Anders Haugum | b32b19b | 2006-04-30 11:20:56 +0100 | [diff] [blame] | 2433 | serial_dl_write(up, quot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2434 | |
| 2435 | /* |
Joe Schultz | 45a7bd6 | 2014-02-11 18:30:01 -0600 | [diff] [blame] | 2436 | * XR17V35x UARTs have an extra fractional divisor register (DLD) |
| 2437 | * |
| 2438 | * We need to recalculate all of the registers, because DLM and DLL |
| 2439 | * are already rounded to a whole integer. |
| 2440 | * |
| 2441 | * When recalculating we use a 32x clock instead of a 16x clock to |
| 2442 | * allow 1-bit for rounding in the fractional part. |
| 2443 | */ |
| 2444 | if (up->port.type == PORT_XR17V35X) { |
| 2445 | unsigned int baud_x32 = (port->uartclk * 2) / baud; |
| 2446 | u16 quot = baud_x32 / 32; |
| 2447 | u8 quot_frac = DIV_ROUND_CLOSEST(baud_x32 % 32, 2); |
| 2448 | |
| 2449 | serial_dl_write(up, quot); |
| 2450 | serial_port_out(port, 0x2, quot_frac & 0xf); |
| 2451 | } |
| 2452 | |
| 2453 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR |
| 2455 | * is written without DLAB set, this mode will be disabled. |
| 2456 | */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2457 | if (port->type == PORT_16750) |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2458 | serial_port_out(port, UART_FCR, fcr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2460 | serial_port_out(port, UART_LCR, cval); /* reset DLAB */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | up->lcr = cval; /* Save LCR */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2462 | if (port->type != PORT_16750) { |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2463 | /* emulated UARTs (Lucent Venus 167x) need two steps */ |
| 2464 | if (fcr & UART_FCR_ENABLE_FIFO) |
| 2465 | serial_port_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); |
| 2466 | serial_port_out(port, UART_FCR, fcr); /* set fcr */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | } |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2468 | serial8250_set_mctrl(port, port->mctrl); |
| 2469 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | e991a2b | 2008-04-28 02:14:06 -0700 | [diff] [blame] | 2470 | /* Don't rewrite B0 */ |
| 2471 | if (tty_termios_baud_rate(termios)) |
| 2472 | tty_termios_encode_baud_rate(termios, baud, baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | } |
Philippe Langlais | 235dae5 | 2010-07-29 17:13:57 +0200 | [diff] [blame] | 2474 | EXPORT_SYMBOL(serial8250_do_set_termios); |
| 2475 | |
| 2476 | static void |
| 2477 | serial8250_set_termios(struct uart_port *port, struct ktermios *termios, |
| 2478 | struct ktermios *old) |
| 2479 | { |
| 2480 | if (port->set_termios) |
| 2481 | port->set_termios(port, termios, old); |
| 2482 | else |
| 2483 | serial8250_do_set_termios(port, termios, old); |
| 2484 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2485 | |
| 2486 | static void |
Arnd Bergmann | a0821df | 2010-06-01 22:53:11 +0200 | [diff] [blame] | 2487 | serial8250_set_ldisc(struct uart_port *port, int new) |
Rodolfo Giometti | dc77f16 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 2488 | { |
Arnd Bergmann | a0821df | 2010-06-01 22:53:11 +0200 | [diff] [blame] | 2489 | if (new == N_PPS) { |
Rodolfo Giometti | dc77f16 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 2490 | port->flags |= UPF_HARDPPS_CD; |
| 2491 | serial8250_enable_ms(port); |
| 2492 | } else |
| 2493 | port->flags &= ~UPF_HARDPPS_CD; |
| 2494 | } |
| 2495 | |
Manuel Lauss | c161afe | 2010-09-25 15:13:45 +0200 | [diff] [blame] | 2496 | |
| 2497 | void serial8250_do_pm(struct uart_port *port, unsigned int state, |
| 2498 | unsigned int oldstate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 2500 | struct uart_8250_port *p = |
| 2501 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | |
| 2503 | serial8250_set_sleep(p, state != 0); |
Manuel Lauss | c161afe | 2010-09-25 15:13:45 +0200 | [diff] [blame] | 2504 | } |
| 2505 | EXPORT_SYMBOL(serial8250_do_pm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2506 | |
Manuel Lauss | c161afe | 2010-09-25 15:13:45 +0200 | [diff] [blame] | 2507 | static void |
| 2508 | serial8250_pm(struct uart_port *port, unsigned int state, |
| 2509 | unsigned int oldstate) |
| 2510 | { |
| 2511 | if (port->pm) |
| 2512 | port->pm(port, state, oldstate); |
| 2513 | else |
| 2514 | serial8250_do_pm(port, state, oldstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | } |
| 2516 | |
Russell King | f2eda27 | 2008-09-01 21:47:59 +0100 | [diff] [blame] | 2517 | static unsigned int serial8250_port_size(struct uart_8250_port *pt) |
| 2518 | { |
| 2519 | if (pt->port.iotype == UPIO_AU) |
Manuel Lauss | b2b13cd | 2009-10-28 21:37:28 +0100 | [diff] [blame] | 2520 | return 0x1000; |
Tony Lindgren | 54ec52b | 2012-10-03 15:31:58 -0700 | [diff] [blame] | 2521 | if (is_omap1_8250(pt)) |
Russell King | f2eda27 | 2008-09-01 21:47:59 +0100 | [diff] [blame] | 2522 | return 0x16 << pt->port.regshift; |
Tony Lindgren | 54ec52b | 2012-10-03 15:31:58 -0700 | [diff] [blame] | 2523 | |
Russell King | f2eda27 | 2008-09-01 21:47:59 +0100 | [diff] [blame] | 2524 | return 8 << pt->port.regshift; |
| 2525 | } |
| 2526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2527 | /* |
| 2528 | * Resource handling. |
| 2529 | */ |
| 2530 | static int serial8250_request_std_resource(struct uart_8250_port *up) |
| 2531 | { |
Russell King | f2eda27 | 2008-09-01 21:47:59 +0100 | [diff] [blame] | 2532 | unsigned int size = serial8250_port_size(up); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2533 | struct uart_port *port = &up->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2534 | int ret = 0; |
| 2535 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2536 | switch (port->iotype) { |
Sergei Shtylyov | 85835f4 | 2006-04-30 11:15:58 +0100 | [diff] [blame] | 2537 | case UPIO_AU: |
Sergei Shtylyov | 0b30d66 | 2006-09-09 22:23:56 +0400 | [diff] [blame] | 2538 | case UPIO_TSI: |
| 2539 | case UPIO_MEM32: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | case UPIO_MEM: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2541 | if (!port->mapbase) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | break; |
| 2543 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2544 | if (!request_mem_region(port->mapbase, size, "serial")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2545 | ret = -EBUSY; |
| 2546 | break; |
| 2547 | } |
| 2548 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2549 | if (port->flags & UPF_IOREMAP) { |
| 2550 | port->membase = ioremap_nocache(port->mapbase, size); |
| 2551 | if (!port->membase) { |
| 2552 | release_mem_region(port->mapbase, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2553 | ret = -ENOMEM; |
| 2554 | } |
| 2555 | } |
| 2556 | break; |
| 2557 | |
| 2558 | case UPIO_HUB6: |
| 2559 | case UPIO_PORT: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2560 | if (!request_region(port->iobase, size, "serial")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2561 | ret = -EBUSY; |
| 2562 | break; |
| 2563 | } |
| 2564 | return ret; |
| 2565 | } |
| 2566 | |
| 2567 | static void serial8250_release_std_resource(struct uart_8250_port *up) |
| 2568 | { |
Russell King | f2eda27 | 2008-09-01 21:47:59 +0100 | [diff] [blame] | 2569 | unsigned int size = serial8250_port_size(up); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2570 | struct uart_port *port = &up->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2571 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2572 | switch (port->iotype) { |
Sergei Shtylyov | 85835f4 | 2006-04-30 11:15:58 +0100 | [diff] [blame] | 2573 | case UPIO_AU: |
Sergei Shtylyov | 0b30d66 | 2006-09-09 22:23:56 +0400 | [diff] [blame] | 2574 | case UPIO_TSI: |
| 2575 | case UPIO_MEM32: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | case UPIO_MEM: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2577 | if (!port->mapbase) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2578 | break; |
| 2579 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2580 | if (port->flags & UPF_IOREMAP) { |
| 2581 | iounmap(port->membase); |
| 2582 | port->membase = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | } |
| 2584 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2585 | release_mem_region(port->mapbase, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2586 | break; |
| 2587 | |
| 2588 | case UPIO_HUB6: |
| 2589 | case UPIO_PORT: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2590 | release_region(port->iobase, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2591 | break; |
| 2592 | } |
| 2593 | } |
| 2594 | |
| 2595 | static int serial8250_request_rsa_resource(struct uart_8250_port *up) |
| 2596 | { |
| 2597 | unsigned long start = UART_RSA_BASE << up->port.regshift; |
| 2598 | unsigned int size = 8 << up->port.regshift; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2599 | struct uart_port *port = &up->port; |
Sergei Shtylyov | 0b30d66 | 2006-09-09 22:23:56 +0400 | [diff] [blame] | 2600 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2602 | switch (port->iotype) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | case UPIO_HUB6: |
| 2604 | case UPIO_PORT: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2605 | start += port->iobase; |
Sergei Shtylyov | 0b30d66 | 2006-09-09 22:23:56 +0400 | [diff] [blame] | 2606 | if (request_region(start, size, "serial-rsa")) |
| 2607 | ret = 0; |
| 2608 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2609 | ret = -EBUSY; |
| 2610 | break; |
| 2611 | } |
| 2612 | |
| 2613 | return ret; |
| 2614 | } |
| 2615 | |
| 2616 | static void serial8250_release_rsa_resource(struct uart_8250_port *up) |
| 2617 | { |
| 2618 | unsigned long offset = UART_RSA_BASE << up->port.regshift; |
| 2619 | unsigned int size = 8 << up->port.regshift; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2620 | struct uart_port *port = &up->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2621 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2622 | switch (port->iotype) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2623 | case UPIO_HUB6: |
| 2624 | case UPIO_PORT: |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2625 | release_region(port->iobase + offset, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2626 | break; |
| 2627 | } |
| 2628 | } |
| 2629 | |
| 2630 | static void serial8250_release_port(struct uart_port *port) |
| 2631 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 2632 | struct uart_8250_port *up = |
| 2633 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2634 | |
| 2635 | serial8250_release_std_resource(up); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2636 | if (port->type == PORT_RSA) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2637 | serial8250_release_rsa_resource(up); |
| 2638 | } |
| 2639 | |
| 2640 | static int serial8250_request_port(struct uart_port *port) |
| 2641 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 2642 | struct uart_8250_port *up = |
| 2643 | container_of(port, struct uart_8250_port, port); |
Sean Young | 65ecc9c | 2012-09-07 19:06:24 +0100 | [diff] [blame] | 2644 | int ret; |
| 2645 | |
| 2646 | if (port->type == PORT_8250_CIR) |
| 2647 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2648 | |
| 2649 | ret = serial8250_request_std_resource(up); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2650 | if (ret == 0 && port->type == PORT_RSA) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2651 | ret = serial8250_request_rsa_resource(up); |
| 2652 | if (ret < 0) |
| 2653 | serial8250_release_std_resource(up); |
| 2654 | } |
| 2655 | |
| 2656 | return ret; |
| 2657 | } |
| 2658 | |
| 2659 | static void serial8250_config_port(struct uart_port *port, int flags) |
| 2660 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 2661 | struct uart_8250_port *up = |
| 2662 | container_of(port, struct uart_8250_port, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | int probeflags = PROBE_ANY; |
| 2664 | int ret; |
| 2665 | |
Sean Young | 65ecc9c | 2012-09-07 19:06:24 +0100 | [diff] [blame] | 2666 | if (port->type == PORT_8250_CIR) |
| 2667 | return; |
| 2668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2669 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2670 | * Find the region that we can probe for. This in turn |
| 2671 | * tells us whether we can probe for the type of port. |
| 2672 | */ |
| 2673 | ret = serial8250_request_std_resource(up); |
| 2674 | if (ret < 0) |
| 2675 | return; |
| 2676 | |
| 2677 | ret = serial8250_request_rsa_resource(up); |
| 2678 | if (ret < 0) |
| 2679 | probeflags &= ~PROBE_RSA; |
| 2680 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2681 | if (port->iotype != up->cur_iotype) |
Alan Cox | b8e7e40 | 2009-05-28 14:01:35 +0100 | [diff] [blame] | 2682 | set_io_from_upio(port); |
| 2683 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | if (flags & UART_CONFIG_TYPE) |
| 2685 | autoconfig(up, probeflags); |
Manuel Lauss | b2b13cd | 2009-10-28 21:37:28 +0100 | [diff] [blame] | 2686 | |
Manuel Lauss | b2b13cd | 2009-10-28 21:37:28 +0100 | [diff] [blame] | 2687 | /* if access method is AU, it is a 16550 with a quirk */ |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2688 | if (port->type == PORT_16550A && port->iotype == UPIO_AU) |
Manuel Lauss | b2b13cd | 2009-10-28 21:37:28 +0100 | [diff] [blame] | 2689 | up->bugs |= UART_BUG_NOMSR; |
Manuel Lauss | b2b13cd | 2009-10-28 21:37:28 +0100 | [diff] [blame] | 2690 | |
Stephen Warren | 3685f19 | 2014-01-07 15:00:12 -0700 | [diff] [blame] | 2691 | /* HW bugs may trigger IRQ while IIR == NO_INT */ |
| 2692 | if (port->type == PORT_TEGRA) |
| 2693 | up->bugs |= UART_BUG_NOMSR; |
| 2694 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2695 | if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | autoconfig_irq(up); |
| 2697 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2698 | if (port->type != PORT_RSA && probeflags & PROBE_RSA) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2699 | serial8250_release_rsa_resource(up); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2700 | if (port->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2701 | serial8250_release_std_resource(up); |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 2702 | |
| 2703 | /* Fixme: probably not the best place for this */ |
Matt Schulte | 30fa96a | 2012-11-21 09:40:49 -0600 | [diff] [blame] | 2704 | if ((port->type == PORT_XR17V35X) || |
| 2705 | (port->type == PORT_XR17D15X)) |
Matt Schulte | dc96efb | 2012-11-19 09:12:04 -0600 | [diff] [blame] | 2706 | port->handle_irq = exar_handle_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2707 | } |
| 2708 | |
| 2709 | static int |
| 2710 | serial8250_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 2711 | { |
Yinghai Lu | a62c413 | 2008-08-19 20:49:55 -0700 | [diff] [blame] | 2712 | if (ser->irq >= nr_irqs || ser->irq < 0 || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2713 | ser->baud_base < 9600 || ser->type < PORT_UNKNOWN || |
| 2714 | ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS || |
| 2715 | ser->type == PORT_STARTECH) |
| 2716 | return -EINVAL; |
| 2717 | return 0; |
| 2718 | } |
| 2719 | |
| 2720 | static const char * |
| 2721 | serial8250_type(struct uart_port *port) |
| 2722 | { |
| 2723 | int type = port->type; |
| 2724 | |
| 2725 | if (type >= ARRAY_SIZE(uart_config)) |
| 2726 | type = 0; |
| 2727 | return uart_config[type].name; |
| 2728 | } |
| 2729 | |
| 2730 | static struct uart_ops serial8250_pops = { |
| 2731 | .tx_empty = serial8250_tx_empty, |
| 2732 | .set_mctrl = serial8250_set_mctrl, |
| 2733 | .get_mctrl = serial8250_get_mctrl, |
| 2734 | .stop_tx = serial8250_stop_tx, |
| 2735 | .start_tx = serial8250_start_tx, |
| 2736 | .stop_rx = serial8250_stop_rx, |
| 2737 | .enable_ms = serial8250_enable_ms, |
| 2738 | .break_ctl = serial8250_break_ctl, |
| 2739 | .startup = serial8250_startup, |
| 2740 | .shutdown = serial8250_shutdown, |
| 2741 | .set_termios = serial8250_set_termios, |
Rodolfo Giometti | dc77f16 | 2010-03-10 15:23:48 -0800 | [diff] [blame] | 2742 | .set_ldisc = serial8250_set_ldisc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2743 | .pm = serial8250_pm, |
| 2744 | .type = serial8250_type, |
| 2745 | .release_port = serial8250_release_port, |
| 2746 | .request_port = serial8250_request_port, |
| 2747 | .config_port = serial8250_config_port, |
| 2748 | .verify_port = serial8250_verify_port, |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2749 | #ifdef CONFIG_CONSOLE_POLL |
| 2750 | .poll_get_char = serial8250_get_poll_char, |
| 2751 | .poll_put_char = serial8250_put_poll_char, |
| 2752 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2753 | }; |
| 2754 | |
| 2755 | static struct uart_8250_port serial8250_ports[UART_NR]; |
| 2756 | |
Alan Cox | af7f374 | 2010-10-18 11:38:02 -0700 | [diff] [blame] | 2757 | static void (*serial8250_isa_config)(int port, struct uart_port *up, |
| 2758 | unsigned short *capabilities); |
| 2759 | |
| 2760 | void serial8250_set_isa_configurator( |
| 2761 | void (*v)(int port, struct uart_port *up, unsigned short *capabilities)) |
| 2762 | { |
| 2763 | serial8250_isa_config = v; |
| 2764 | } |
| 2765 | EXPORT_SYMBOL(serial8250_set_isa_configurator); |
| 2766 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2767 | static void __init serial8250_isa_init_ports(void) |
| 2768 | { |
| 2769 | struct uart_8250_port *up; |
| 2770 | static int first = 1; |
André Goddard Rosa | 4c0ebb8 | 2009-10-25 12:01:34 -0200 | [diff] [blame] | 2771 | int i, irqflag = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2772 | |
| 2773 | if (!first) |
| 2774 | return; |
| 2775 | first = 0; |
| 2776 | |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 2777 | if (nr_uarts > UART_NR) |
| 2778 | nr_uarts = UART_NR; |
| 2779 | |
Kyle McMartin | 317a684 | 2013-06-03 09:38:26 -0400 | [diff] [blame] | 2780 | for (i = 0; i < nr_uarts; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2781 | struct uart_8250_port *up = &serial8250_ports[i]; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2782 | struct uart_port *port = &up->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2784 | port->line = i; |
| 2785 | spin_lock_init(&port->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | |
| 2787 | init_timer(&up->timer); |
| 2788 | up->timer.function = serial8250_timeout; |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 2789 | up->cur_iotype = 0xFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2790 | |
| 2791 | /* |
| 2792 | * ALPHA_KLUDGE_MCR needs to be killed. |
| 2793 | */ |
| 2794 | up->mcr_mask = ~ALPHA_KLUDGE_MCR; |
| 2795 | up->mcr_force = ALPHA_KLUDGE_MCR; |
| 2796 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2797 | port->ops = &serial8250_pops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2798 | } |
| 2799 | |
André Goddard Rosa | 4c0ebb8 | 2009-10-25 12:01:34 -0200 | [diff] [blame] | 2800 | if (share_irqs) |
| 2801 | irqflag = IRQF_SHARED; |
| 2802 | |
Russell King | 44454bc | 2005-06-30 22:41:22 +0100 | [diff] [blame] | 2803 | for (i = 0, up = serial8250_ports; |
Dave Jones | a61c2d7 | 2006-01-07 23:18:19 +0000 | [diff] [blame] | 2804 | i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | i++, up++) { |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2806 | struct uart_port *port = &up->port; |
| 2807 | |
| 2808 | port->iobase = old_serial_port[i].port; |
| 2809 | port->irq = irq_canonicalize(old_serial_port[i].irq); |
| 2810 | port->irqflags = old_serial_port[i].irqflags; |
| 2811 | port->uartclk = old_serial_port[i].baud_base * 16; |
| 2812 | port->flags = old_serial_port[i].flags; |
| 2813 | port->hub6 = old_serial_port[i].hub6; |
| 2814 | port->membase = old_serial_port[i].iomem_base; |
| 2815 | port->iotype = old_serial_port[i].io_type; |
| 2816 | port->regshift = old_serial_port[i].iomem_reg_shift; |
| 2817 | set_io_from_upio(port); |
| 2818 | port->irqflags |= irqflag; |
Alan Cox | af7f374 | 2010-10-18 11:38:02 -0700 | [diff] [blame] | 2819 | if (serial8250_isa_config != NULL) |
| 2820 | serial8250_isa_config(i, &up->port, &up->capabilities); |
| 2821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2822 | } |
| 2823 | } |
| 2824 | |
Shmulik Ladkani | b5d228c | 2009-12-09 12:31:29 -0800 | [diff] [blame] | 2825 | static void |
| 2826 | serial8250_init_fixed_type_port(struct uart_8250_port *up, unsigned int type) |
| 2827 | { |
| 2828 | up->port.type = type; |
Heikki Krogerus | 9660497 | 2013-01-10 11:25:05 +0200 | [diff] [blame] | 2829 | if (!up->port.fifosize) |
| 2830 | up->port.fifosize = uart_config[type].fifo_size; |
| 2831 | if (!up->tx_loadsz) |
| 2832 | up->tx_loadsz = uart_config[type].tx_loadsz; |
| 2833 | if (!up->capabilities) |
| 2834 | up->capabilities = uart_config[type].flags; |
Shmulik Ladkani | b5d228c | 2009-12-09 12:31:29 -0800 | [diff] [blame] | 2835 | } |
| 2836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2837 | static void __init |
| 2838 | serial8250_register_ports(struct uart_driver *drv, struct device *dev) |
| 2839 | { |
| 2840 | int i; |
| 2841 | |
Alan Cox | b8e7e40 | 2009-05-28 14:01:35 +0100 | [diff] [blame] | 2842 | for (i = 0; i < nr_uarts; i++) { |
| 2843 | struct uart_8250_port *up = &serial8250_ports[i]; |
Alan Cox | b8e7e40 | 2009-05-28 14:01:35 +0100 | [diff] [blame] | 2844 | |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 2845 | if (up->port.dev) |
| 2846 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2847 | |
| 2848 | up->port.dev = dev; |
Shmulik Ladkani | b5d228c | 2009-12-09 12:31:29 -0800 | [diff] [blame] | 2849 | |
| 2850 | if (up->port.flags & UPF_FIXED_TYPE) |
| 2851 | serial8250_init_fixed_type_port(up, up->port.type); |
| 2852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2853 | uart_add_one_port(drv, &up->port); |
| 2854 | } |
| 2855 | } |
| 2856 | |
| 2857 | #ifdef CONFIG_SERIAL_8250_CONSOLE |
| 2858 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 2859 | static void serial8250_console_putchar(struct uart_port *port, int ch) |
| 2860 | { |
Jamie Iles | 49d5741 | 2010-12-01 23:39:35 +0000 | [diff] [blame] | 2861 | struct uart_8250_port *up = |
| 2862 | container_of(port, struct uart_8250_port, port); |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 2863 | |
| 2864 | wait_for_xmitr(up, UART_LSR_THRE); |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2865 | serial_port_out(port, UART_TX, ch); |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 2866 | } |
| 2867 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2868 | /* |
| 2869 | * Print a string to the serial port trying not to disturb |
| 2870 | * any possible real use of the port... |
| 2871 | * |
| 2872 | * The console_lock must be held when we get here. |
| 2873 | */ |
| 2874 | static void |
| 2875 | serial8250_console_write(struct console *co, const char *s, unsigned int count) |
| 2876 | { |
| 2877 | struct uart_8250_port *up = &serial8250_ports[co->index]; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2878 | struct uart_port *port = &up->port; |
Russell King | d8a5a8d | 2006-05-02 16:04:29 +0100 | [diff] [blame] | 2879 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2880 | unsigned int ier; |
Russell King | d8a5a8d | 2006-05-02 16:04:29 +0100 | [diff] [blame] | 2881 | int locked = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | |
Andrew Morton | 78512ec | 2005-11-07 00:59:13 -0800 | [diff] [blame] | 2883 | touch_nmi_watchdog(); |
| 2884 | |
Andrew Morton | 68aa2c0 | 2006-06-30 02:29:59 -0700 | [diff] [blame] | 2885 | local_irq_save(flags); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2886 | if (port->sysrq) { |
Paul Gortmaker | 86b2119 | 2011-12-04 18:42:22 -0500 | [diff] [blame] | 2887 | /* serial8250_handle_irq() already took the lock */ |
Andrew Morton | 68aa2c0 | 2006-06-30 02:29:59 -0700 | [diff] [blame] | 2888 | locked = 0; |
| 2889 | } else if (oops_in_progress) { |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2890 | locked = spin_trylock(&port->lock); |
Russell King | d8a5a8d | 2006-05-02 16:04:29 +0100 | [diff] [blame] | 2891 | } else |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2892 | spin_lock(&port->lock); |
Russell King | d8a5a8d | 2006-05-02 16:04:29 +0100 | [diff] [blame] | 2893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2894 | /* |
Ralf Baechle | dc7bf13 | 2006-02-15 09:59:47 +0000 | [diff] [blame] | 2895 | * First save the IER then disable the interrupts |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2896 | */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2897 | ier = serial_port_in(port, UART_IER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2898 | |
| 2899 | if (up->capabilities & UART_CAP_UUE) |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2900 | serial_port_out(port, UART_IER, UART_IER_UUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2901 | else |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2902 | serial_port_out(port, UART_IER, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2903 | |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2904 | uart_console_write(port, s, count, serial8250_console_putchar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2905 | |
| 2906 | /* |
| 2907 | * Finally, wait for transmitter to become empty |
| 2908 | * and restore the IER |
| 2909 | */ |
Alan Cox | f91a371 | 2006-01-21 14:59:12 +0000 | [diff] [blame] | 2910 | wait_for_xmitr(up, BOTH_EMPTY); |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 2911 | serial_port_out(port, UART_IER, ier); |
Russell King | d8a5a8d | 2006-05-02 16:04:29 +0100 | [diff] [blame] | 2912 | |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 2913 | /* |
| 2914 | * The receive handling will happen properly because the |
| 2915 | * receive ready bit will still be set; it is not cleared |
| 2916 | * on read. However, modem control will not, we must |
| 2917 | * call it if we have saved something in the saved flags |
| 2918 | * while processing with interrupts off. |
| 2919 | */ |
| 2920 | if (up->msr_saved_flags) |
Paul Gortmaker | 3986fb2 | 2011-12-04 18:42:20 -0500 | [diff] [blame] | 2921 | serial8250_modem_status(up); |
Corey Minyard | ad4c2aa | 2007-08-22 14:01:18 -0700 | [diff] [blame] | 2922 | |
Russell King | d8a5a8d | 2006-05-02 16:04:29 +0100 | [diff] [blame] | 2923 | if (locked) |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 2924 | spin_unlock(&port->lock); |
Andrew Morton | 68aa2c0 | 2006-06-30 02:29:59 -0700 | [diff] [blame] | 2925 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2926 | } |
| 2927 | |
Vivek Goyal | 118c0ac | 2007-01-11 01:52:44 +0100 | [diff] [blame] | 2928 | static int __init serial8250_console_setup(struct console *co, char *options) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2929 | { |
| 2930 | struct uart_port *port; |
| 2931 | int baud = 9600; |
| 2932 | int bits = 8; |
| 2933 | int parity = 'n'; |
| 2934 | int flow = 'n'; |
| 2935 | |
| 2936 | /* |
| 2937 | * Check whether an invalid uart number has been specified, and |
| 2938 | * if so, search for the first available port that does have |
| 2939 | * console support. |
| 2940 | */ |
Kyle McMartin | 317a684 | 2013-06-03 09:38:26 -0400 | [diff] [blame] | 2941 | if (co->index >= nr_uarts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2942 | co->index = 0; |
| 2943 | port = &serial8250_ports[co->index].port; |
| 2944 | if (!port->iobase && !port->membase) |
| 2945 | return -ENODEV; |
| 2946 | |
| 2947 | if (options) |
| 2948 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 2949 | |
| 2950 | return uart_set_options(port, co, baud, parity, bits, flow); |
| 2951 | } |
| 2952 | |
Daniel Ritz | b6b1d87 | 2007-08-03 16:07:43 +0200 | [diff] [blame] | 2953 | static int serial8250_console_early_setup(void) |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 2954 | { |
| 2955 | return serial8250_find_port_for_earlycon(); |
| 2956 | } |
| 2957 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2958 | static struct console serial8250_console = { |
| 2959 | .name = "ttyS", |
| 2960 | .write = serial8250_console_write, |
| 2961 | .device = uart_console_device, |
| 2962 | .setup = serial8250_console_setup, |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 2963 | .early_setup = serial8250_console_early_setup, |
Peter Zijlstra | a80c49d | 2010-11-15 21:11:12 +0100 | [diff] [blame] | 2964 | .flags = CON_PRINTBUFFER | CON_ANYTIME, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2965 | .index = -1, |
| 2966 | .data = &serial8250_reg, |
| 2967 | }; |
| 2968 | |
| 2969 | static int __init serial8250_console_init(void) |
| 2970 | { |
| 2971 | serial8250_isa_init_ports(); |
| 2972 | register_console(&serial8250_console); |
| 2973 | return 0; |
| 2974 | } |
| 2975 | console_initcall(serial8250_console_init); |
| 2976 | |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 2977 | int serial8250_find_port(struct uart_port *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2978 | { |
| 2979 | int line; |
| 2980 | struct uart_port *port; |
| 2981 | |
Kyle McMartin | 317a684 | 2013-06-03 09:38:26 -0400 | [diff] [blame] | 2982 | for (line = 0; line < nr_uarts; line++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2983 | port = &serial8250_ports[line].port; |
Russell King | 50aec3b5 | 2006-01-04 18:13:03 +0000 | [diff] [blame] | 2984 | if (uart_match_port(p, port)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2985 | return line; |
| 2986 | } |
| 2987 | return -ENODEV; |
| 2988 | } |
| 2989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2990 | #define SERIAL8250_CONSOLE &serial8250_console |
| 2991 | #else |
| 2992 | #define SERIAL8250_CONSOLE NULL |
| 2993 | #endif |
| 2994 | |
| 2995 | static struct uart_driver serial8250_reg = { |
| 2996 | .owner = THIS_MODULE, |
| 2997 | .driver_name = "serial", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2998 | .dev_name = "ttyS", |
| 2999 | .major = TTY_MAJOR, |
| 3000 | .minor = 64, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3001 | .cons = SERIAL8250_CONSOLE, |
| 3002 | }; |
| 3003 | |
Russell King | d856c66 | 2006-02-23 10:22:13 +0000 | [diff] [blame] | 3004 | /* |
| 3005 | * early_serial_setup - early registration for 8250 ports |
| 3006 | * |
| 3007 | * Setup an 8250 port structure prior to console initialisation. Use |
| 3008 | * after console initialisation will cause undefined behaviour. |
| 3009 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3010 | int __init early_serial_setup(struct uart_port *port) |
| 3011 | { |
David Daney | b430428 | 2009-01-02 13:49:41 +0000 | [diff] [blame] | 3012 | struct uart_port *p; |
| 3013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3014 | if (port->line >= ARRAY_SIZE(serial8250_ports)) |
| 3015 | return -ENODEV; |
| 3016 | |
| 3017 | serial8250_isa_init_ports(); |
David Daney | b430428 | 2009-01-02 13:49:41 +0000 | [diff] [blame] | 3018 | p = &serial8250_ports[port->line].port; |
| 3019 | p->iobase = port->iobase; |
| 3020 | p->membase = port->membase; |
| 3021 | p->irq = port->irq; |
Vikram Pandita | 1c2f049 | 2009-09-19 13:13:19 -0700 | [diff] [blame] | 3022 | p->irqflags = port->irqflags; |
David Daney | b430428 | 2009-01-02 13:49:41 +0000 | [diff] [blame] | 3023 | p->uartclk = port->uartclk; |
| 3024 | p->fifosize = port->fifosize; |
| 3025 | p->regshift = port->regshift; |
| 3026 | p->iotype = port->iotype; |
| 3027 | p->flags = port->flags; |
| 3028 | p->mapbase = port->mapbase; |
| 3029 | p->private_data = port->private_data; |
Helge Deller | 125c97d | 2009-01-13 22:51:07 +0100 | [diff] [blame] | 3030 | p->type = port->type; |
| 3031 | p->line = port->line; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 3032 | |
| 3033 | set_io_from_upio(p); |
| 3034 | if (port->serial_in) |
| 3035 | p->serial_in = port->serial_in; |
| 3036 | if (port->serial_out) |
| 3037 | p->serial_out = port->serial_out; |
Jamie Iles | 583d28e | 2011-08-15 10:17:52 +0100 | [diff] [blame] | 3038 | if (port->handle_irq) |
| 3039 | p->handle_irq = port->handle_irq; |
| 3040 | else |
| 3041 | p->handle_irq = serial8250_default_handle_irq; |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 3042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3043 | return 0; |
| 3044 | } |
| 3045 | |
| 3046 | /** |
| 3047 | * serial8250_suspend_port - suspend one serial port |
| 3048 | * @line: serial line number |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3049 | * |
| 3050 | * Suspend one serial port. |
| 3051 | */ |
| 3052 | void serial8250_suspend_port(int line) |
| 3053 | { |
| 3054 | uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port); |
| 3055 | } |
| 3056 | |
| 3057 | /** |
| 3058 | * serial8250_resume_port - resume one serial port |
| 3059 | * @line: serial line number |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3060 | * |
| 3061 | * Resume one serial port. |
| 3062 | */ |
| 3063 | void serial8250_resume_port(int line) |
| 3064 | { |
David Woodhouse | b5b82df | 2007-05-17 14:27:39 +0800 | [diff] [blame] | 3065 | struct uart_8250_port *up = &serial8250_ports[line]; |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 3066 | struct uart_port *port = &up->port; |
David Woodhouse | b5b82df | 2007-05-17 14:27:39 +0800 | [diff] [blame] | 3067 | |
| 3068 | if (up->capabilities & UART_NATSEMI) { |
David Woodhouse | b5b82df | 2007-05-17 14:27:39 +0800 | [diff] [blame] | 3069 | /* Ensure it's still in high speed mode */ |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 3070 | serial_port_out(port, UART_LCR, 0xE0); |
David Woodhouse | b5b82df | 2007-05-17 14:27:39 +0800 | [diff] [blame] | 3071 | |
Yin Kangkai | 0d0389e | 2011-02-09 11:35:18 +0800 | [diff] [blame] | 3072 | ns16550a_goto_highspeed(up); |
David Woodhouse | b5b82df | 2007-05-17 14:27:39 +0800 | [diff] [blame] | 3073 | |
Paul Gortmaker | 4fd996a | 2012-03-08 19:12:13 -0500 | [diff] [blame] | 3074 | serial_port_out(port, UART_LCR, 0); |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 3075 | port->uartclk = 921600*16; |
David Woodhouse | b5b82df | 2007-05-17 14:27:39 +0800 | [diff] [blame] | 3076 | } |
Paul Gortmaker | dfe4244 | 2012-03-08 19:12:11 -0500 | [diff] [blame] | 3077 | uart_resume_port(&serial8250_reg, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3078 | } |
| 3079 | |
| 3080 | /* |
| 3081 | * Register a set of serial devices attached to a platform device. The |
| 3082 | * list is terminated with a zero flags entry, which means we expect |
| 3083 | * all entries to have at least UPF_BOOT_AUTOCONF set. |
| 3084 | */ |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 3085 | static int serial8250_probe(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3086 | { |
Jingoo Han | 574de55 | 2013-07-30 17:06:57 +0900 | [diff] [blame] | 3087 | struct plat_serial8250_port *p = dev_get_platdata(&dev->dev); |
Alan Cox | 2655a2c | 2012-07-12 12:59:50 +0100 | [diff] [blame] | 3088 | struct uart_8250_port uart; |
André Goddard Rosa | 4c0ebb8 | 2009-10-25 12:01:34 -0200 | [diff] [blame] | 3089 | int ret, i, irqflag = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3090 | |
Alan Cox | 2655a2c | 2012-07-12 12:59:50 +0100 | [diff] [blame] | 3091 | memset(&uart, 0, sizeof(uart)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3092 | |
André Goddard Rosa | 4c0ebb8 | 2009-10-25 12:01:34 -0200 | [diff] [blame] | 3093 | if (share_irqs) |
| 3094 | irqflag = IRQF_SHARED; |
| 3095 | |
Russell King | ec9f47c | 2005-06-27 11:12:54 +0100 | [diff] [blame] | 3096 | for (i = 0; p && p->flags != 0; p++, i++) { |
Alan Cox | 2655a2c | 2012-07-12 12:59:50 +0100 | [diff] [blame] | 3097 | uart.port.iobase = p->iobase; |
| 3098 | uart.port.membase = p->membase; |
| 3099 | uart.port.irq = p->irq; |
| 3100 | uart.port.irqflags = p->irqflags; |
| 3101 | uart.port.uartclk = p->uartclk; |
| 3102 | uart.port.regshift = p->regshift; |
| 3103 | uart.port.iotype = p->iotype; |
| 3104 | uart.port.flags = p->flags; |
| 3105 | uart.port.mapbase = p->mapbase; |
| 3106 | uart.port.hub6 = p->hub6; |
| 3107 | uart.port.private_data = p->private_data; |
| 3108 | uart.port.type = p->type; |
| 3109 | uart.port.serial_in = p->serial_in; |
| 3110 | uart.port.serial_out = p->serial_out; |
| 3111 | uart.port.handle_irq = p->handle_irq; |
| 3112 | uart.port.handle_break = p->handle_break; |
| 3113 | uart.port.set_termios = p->set_termios; |
| 3114 | uart.port.pm = p->pm; |
| 3115 | uart.port.dev = &dev->dev; |
| 3116 | uart.port.irqflags |= irqflag; |
| 3117 | ret = serial8250_register_8250_port(&uart); |
Russell King | ec9f47c | 2005-06-27 11:12:54 +0100 | [diff] [blame] | 3118 | if (ret < 0) { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3119 | dev_err(&dev->dev, "unable to register port at index %d " |
Josh Boyer | 4f640ef | 2007-07-23 18:43:44 -0700 | [diff] [blame] | 3120 | "(IO%lx MEM%llx IRQ%d): %d\n", i, |
| 3121 | p->iobase, (unsigned long long)p->mapbase, |
| 3122 | p->irq, ret); |
Russell King | ec9f47c | 2005-06-27 11:12:54 +0100 | [diff] [blame] | 3123 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3124 | } |
| 3125 | return 0; |
| 3126 | } |
| 3127 | |
| 3128 | /* |
| 3129 | * Remove serial ports registered against a platform device. |
| 3130 | */ |
Bill Pemberton | ae8d8a1 | 2012-11-19 13:26:18 -0500 | [diff] [blame] | 3131 | static int serial8250_remove(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | { |
| 3133 | int i; |
| 3134 | |
Kyle McMartin | 317a684 | 2013-06-03 09:38:26 -0400 | [diff] [blame] | 3135 | for (i = 0; i < nr_uarts; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3136 | struct uart_8250_port *up = &serial8250_ports[i]; |
| 3137 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3138 | if (up->port.dev == &dev->dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3139 | serial8250_unregister_port(i); |
| 3140 | } |
| 3141 | return 0; |
| 3142 | } |
| 3143 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3144 | static int serial8250_suspend(struct platform_device *dev, pm_message_t state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3145 | { |
| 3146 | int i; |
| 3147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3148 | for (i = 0; i < UART_NR; i++) { |
| 3149 | struct uart_8250_port *up = &serial8250_ports[i]; |
| 3150 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3151 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3152 | uart_suspend_port(&serial8250_reg, &up->port); |
| 3153 | } |
| 3154 | |
| 3155 | return 0; |
| 3156 | } |
| 3157 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3158 | static int serial8250_resume(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3159 | { |
| 3160 | int i; |
| 3161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3162 | for (i = 0; i < UART_NR; i++) { |
| 3163 | struct uart_8250_port *up = &serial8250_ports[i]; |
| 3164 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3165 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
David Woodhouse | b5b82df | 2007-05-17 14:27:39 +0800 | [diff] [blame] | 3166 | serial8250_resume_port(i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3167 | } |
| 3168 | |
| 3169 | return 0; |
| 3170 | } |
| 3171 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3172 | static struct platform_driver serial8250_isa_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3173 | .probe = serial8250_probe, |
Bill Pemberton | 2d47b71 | 2012-11-19 13:21:34 -0500 | [diff] [blame] | 3174 | .remove = serial8250_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3175 | .suspend = serial8250_suspend, |
| 3176 | .resume = serial8250_resume, |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3177 | .driver = { |
| 3178 | .name = "serial8250", |
Dmitry Torokhov | 7493a31 | 2006-01-13 22:06:43 +0000 | [diff] [blame] | 3179 | .owner = THIS_MODULE, |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3180 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3181 | }; |
| 3182 | |
| 3183 | /* |
| 3184 | * This "device" covers _all_ ISA 8250-compatible serial devices listed |
| 3185 | * in the table in include/asm/serial.h |
| 3186 | */ |
| 3187 | static struct platform_device *serial8250_isa_devs; |
| 3188 | |
| 3189 | /* |
Alan Cox | 2655a2c | 2012-07-12 12:59:50 +0100 | [diff] [blame] | 3190 | * serial8250_register_8250_port and serial8250_unregister_port allows for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3191 | * 16x50 serial ports to be configured at run-time, to support PCMCIA |
| 3192 | * modems and PCI multiport cards. |
| 3193 | */ |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 3194 | static DEFINE_MUTEX(serial_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3195 | |
| 3196 | static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) |
| 3197 | { |
| 3198 | int i; |
| 3199 | |
| 3200 | /* |
| 3201 | * First, find a port entry which matches. |
| 3202 | */ |
Kyle McMartin | 317a684 | 2013-06-03 09:38:26 -0400 | [diff] [blame] | 3203 | for (i = 0; i < nr_uarts; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3204 | if (uart_match_port(&serial8250_ports[i].port, port)) |
| 3205 | return &serial8250_ports[i]; |
| 3206 | |
| 3207 | /* |
| 3208 | * We didn't find a matching entry, so look for the first |
| 3209 | * free entry. We look for one which hasn't been previously |
| 3210 | * used (indicated by zero iobase). |
| 3211 | */ |
Kyle McMartin | 317a684 | 2013-06-03 09:38:26 -0400 | [diff] [blame] | 3212 | for (i = 0; i < nr_uarts; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3213 | if (serial8250_ports[i].port.type == PORT_UNKNOWN && |
| 3214 | serial8250_ports[i].port.iobase == 0) |
| 3215 | return &serial8250_ports[i]; |
| 3216 | |
| 3217 | /* |
| 3218 | * That also failed. Last resort is to find any entry which |
| 3219 | * doesn't have a real port associated with it. |
| 3220 | */ |
Kyle McMartin | 317a684 | 2013-06-03 09:38:26 -0400 | [diff] [blame] | 3221 | for (i = 0; i < nr_uarts; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3222 | if (serial8250_ports[i].port.type == PORT_UNKNOWN) |
| 3223 | return &serial8250_ports[i]; |
| 3224 | |
| 3225 | return NULL; |
| 3226 | } |
| 3227 | |
| 3228 | /** |
Magnus Damm | f73fa05 | 2012-05-02 21:47:27 +0900 | [diff] [blame] | 3229 | * serial8250_register_8250_port - register a serial port |
Randy Dunlap | 58bcd33 | 2012-06-08 18:51:23 -0700 | [diff] [blame] | 3230 | * @up: serial port template |
Magnus Damm | f73fa05 | 2012-05-02 21:47:27 +0900 | [diff] [blame] | 3231 | * |
| 3232 | * Configure the serial port specified by the request. If the |
| 3233 | * port exists and is in use, it is hung up and unregistered |
| 3234 | * first. |
| 3235 | * |
| 3236 | * The port is then probed and if necessary the IRQ is autodetected |
| 3237 | * If this fails an error is returned. |
| 3238 | * |
| 3239 | * On success the port is ready to use and the line number is returned. |
| 3240 | */ |
| 3241 | int serial8250_register_8250_port(struct uart_8250_port *up) |
| 3242 | { |
| 3243 | struct uart_8250_port *uart; |
| 3244 | int ret = -ENOSPC; |
| 3245 | |
| 3246 | if (up->port.uartclk == 0) |
| 3247 | return -EINVAL; |
| 3248 | |
| 3249 | mutex_lock(&serial_mutex); |
| 3250 | |
| 3251 | uart = serial8250_find_match_or_unused(&up->port); |
Sean Young | 65ecc9c | 2012-09-07 19:06:24 +0100 | [diff] [blame] | 3252 | if (uart && uart->port.type != PORT_8250_CIR) { |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 3253 | if (uart->port.dev) |
| 3254 | uart_remove_one_port(&serial8250_reg, &uart->port); |
Magnus Damm | f73fa05 | 2012-05-02 21:47:27 +0900 | [diff] [blame] | 3255 | |
| 3256 | uart->port.iobase = up->port.iobase; |
| 3257 | uart->port.membase = up->port.membase; |
| 3258 | uart->port.irq = up->port.irq; |
| 3259 | uart->port.irqflags = up->port.irqflags; |
| 3260 | uart->port.uartclk = up->port.uartclk; |
| 3261 | uart->port.fifosize = up->port.fifosize; |
| 3262 | uart->port.regshift = up->port.regshift; |
| 3263 | uart->port.iotype = up->port.iotype; |
| 3264 | uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; |
Alan Cox | a2d33d8 | 2012-07-12 13:00:06 +0100 | [diff] [blame] | 3265 | uart->bugs = up->bugs; |
Magnus Damm | f73fa05 | 2012-05-02 21:47:27 +0900 | [diff] [blame] | 3266 | uart->port.mapbase = up->port.mapbase; |
| 3267 | uart->port.private_data = up->port.private_data; |
Heikki Krogerus | 9660497 | 2013-01-10 11:25:05 +0200 | [diff] [blame] | 3268 | uart->port.fifosize = up->port.fifosize; |
| 3269 | uart->tx_loadsz = up->tx_loadsz; |
| 3270 | uart->capabilities = up->capabilities; |
| 3271 | |
Heikki Krogerus | 6a3f45d | 2013-03-25 13:34:44 +0200 | [diff] [blame] | 3272 | /* Take tx_loadsz from fifosize if it wasn't set separately */ |
| 3273 | if (uart->port.fifosize && !uart->tx_loadsz) |
| 3274 | uart->tx_loadsz = uart->port.fifosize; |
| 3275 | |
Magnus Damm | f73fa05 | 2012-05-02 21:47:27 +0900 | [diff] [blame] | 3276 | if (up->port.dev) |
| 3277 | uart->port.dev = up->port.dev; |
| 3278 | |
| 3279 | if (up->port.flags & UPF_FIXED_TYPE) |
| 3280 | serial8250_init_fixed_type_port(uart, up->port.type); |
| 3281 | |
| 3282 | set_io_from_upio(&uart->port); |
| 3283 | /* Possibly override default I/O functions. */ |
| 3284 | if (up->port.serial_in) |
| 3285 | uart->port.serial_in = up->port.serial_in; |
| 3286 | if (up->port.serial_out) |
| 3287 | uart->port.serial_out = up->port.serial_out; |
| 3288 | if (up->port.handle_irq) |
| 3289 | uart->port.handle_irq = up->port.handle_irq; |
| 3290 | /* Possibly override set_termios call */ |
| 3291 | if (up->port.set_termios) |
| 3292 | uart->port.set_termios = up->port.set_termios; |
| 3293 | if (up->port.pm) |
| 3294 | uart->port.pm = up->port.pm; |
| 3295 | if (up->port.handle_break) |
| 3296 | uart->port.handle_break = up->port.handle_break; |
| 3297 | if (up->dl_read) |
| 3298 | uart->dl_read = up->dl_read; |
| 3299 | if (up->dl_write) |
| 3300 | uart->dl_write = up->dl_write; |
Heikki Krogerus | 9ee4b83 | 2013-01-10 11:25:11 +0200 | [diff] [blame] | 3301 | if (up->dma) |
| 3302 | uart->dma = up->dma; |
Magnus Damm | f73fa05 | 2012-05-02 21:47:27 +0900 | [diff] [blame] | 3303 | |
| 3304 | if (serial8250_isa_config != NULL) |
| 3305 | serial8250_isa_config(0, &uart->port, |
| 3306 | &uart->capabilities); |
| 3307 | |
| 3308 | ret = uart_add_one_port(&serial8250_reg, &uart->port); |
| 3309 | if (ret == 0) |
| 3310 | ret = uart->port.line; |
| 3311 | } |
| 3312 | mutex_unlock(&serial_mutex); |
| 3313 | |
| 3314 | return ret; |
| 3315 | } |
| 3316 | EXPORT_SYMBOL(serial8250_register_8250_port); |
| 3317 | |
| 3318 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3319 | * serial8250_unregister_port - remove a 16x50 serial port at runtime |
| 3320 | * @line: serial line number |
| 3321 | * |
| 3322 | * Remove one serial port. This may not be called from interrupt |
| 3323 | * context. We hand the port back to the our control. |
| 3324 | */ |
| 3325 | void serial8250_unregister_port(int line) |
| 3326 | { |
| 3327 | struct uart_8250_port *uart = &serial8250_ports[line]; |
| 3328 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 3329 | mutex_lock(&serial_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3330 | uart_remove_one_port(&serial8250_reg, &uart->port); |
| 3331 | if (serial8250_isa_devs) { |
| 3332 | uart->port.flags &= ~UPF_BOOT_AUTOCONF; |
| 3333 | uart->port.type = PORT_UNKNOWN; |
| 3334 | uart->port.dev = &serial8250_isa_devs->dev; |
leitao@linux.vnet.ibm.com | cb01ece | 2011-05-26 11:18:39 -0300 | [diff] [blame] | 3335 | uart->capabilities = uart_config[uart->port.type].flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3336 | uart_add_one_port(&serial8250_reg, &uart->port); |
| 3337 | } else { |
| 3338 | uart->port.dev = NULL; |
| 3339 | } |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 3340 | mutex_unlock(&serial_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3341 | } |
| 3342 | EXPORT_SYMBOL(serial8250_unregister_port); |
| 3343 | |
| 3344 | static int __init serial8250_init(void) |
| 3345 | { |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 3346 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3347 | |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 3348 | serial8250_isa_init_ports(); |
Dave Jones | a61c2d7 | 2006-01-07 23:18:19 +0000 | [diff] [blame] | 3349 | |
Paul Bolle | f1fb9bb | 2008-12-30 14:06:43 +0100 | [diff] [blame] | 3350 | printk(KERN_INFO "Serial: 8250/16550 driver, " |
Dave Jones | a61c2d7 | 2006-01-07 23:18:19 +0000 | [diff] [blame] | 3351 | "%d ports, IRQ sharing %sabled\n", nr_uarts, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3352 | share_irqs ? "en" : "dis"); |
| 3353 | |
David Miller | b70ac77 | 2008-10-13 10:36:31 +0100 | [diff] [blame] | 3354 | #ifdef CONFIG_SPARC |
| 3355 | ret = sunserial_register_minors(&serial8250_reg, UART_NR); |
| 3356 | #else |
| 3357 | serial8250_reg.nr = UART_NR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3358 | ret = uart_register_driver(&serial8250_reg); |
David Miller | b70ac77 | 2008-10-13 10:36:31 +0100 | [diff] [blame] | 3359 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3360 | if (ret) |
| 3361 | goto out; |
| 3362 | |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 3363 | ret = serial8250_pnp_init(); |
| 3364 | if (ret) |
| 3365 | goto unreg_uart_drv; |
| 3366 | |
Dmitry Torokhov | 7493a31 | 2006-01-13 22:06:43 +0000 | [diff] [blame] | 3367 | serial8250_isa_devs = platform_device_alloc("serial8250", |
| 3368 | PLAT8250_DEV_LEGACY); |
| 3369 | if (!serial8250_isa_devs) { |
| 3370 | ret = -ENOMEM; |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 3371 | goto unreg_pnp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3372 | } |
| 3373 | |
Dmitry Torokhov | 7493a31 | 2006-01-13 22:06:43 +0000 | [diff] [blame] | 3374 | ret = platform_device_add(serial8250_isa_devs); |
| 3375 | if (ret) |
| 3376 | goto put_dev; |
| 3377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3378 | serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); |
| 3379 | |
Russell King | bc965a7 | 2006-01-18 09:54:29 +0000 | [diff] [blame] | 3380 | ret = platform_driver_register(&serial8250_isa_driver); |
| 3381 | if (ret == 0) |
| 3382 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3383 | |
Russell King | bc965a7 | 2006-01-18 09:54:29 +0000 | [diff] [blame] | 3384 | platform_device_del(serial8250_isa_devs); |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 3385 | put_dev: |
Dmitry Torokhov | 7493a31 | 2006-01-13 22:06:43 +0000 | [diff] [blame] | 3386 | platform_device_put(serial8250_isa_devs); |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 3387 | unreg_pnp: |
| 3388 | serial8250_pnp_exit(); |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 3389 | unreg_uart_drv: |
David Miller | b70ac77 | 2008-10-13 10:36:31 +0100 | [diff] [blame] | 3390 | #ifdef CONFIG_SPARC |
| 3391 | sunserial_unregister_minors(&serial8250_reg, UART_NR); |
| 3392 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3393 | uart_unregister_driver(&serial8250_reg); |
David Miller | b70ac77 | 2008-10-13 10:36:31 +0100 | [diff] [blame] | 3394 | #endif |
Alan Cox | 25db8ad | 2008-08-19 20:49:40 -0700 | [diff] [blame] | 3395 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3396 | return ret; |
| 3397 | } |
| 3398 | |
| 3399 | static void __exit serial8250_exit(void) |
| 3400 | { |
| 3401 | struct platform_device *isa_dev = serial8250_isa_devs; |
| 3402 | |
| 3403 | /* |
| 3404 | * This tells serial8250_unregister_port() not to re-register |
| 3405 | * the ports (thereby making serial8250_isa_driver permanently |
| 3406 | * in use.) |
| 3407 | */ |
| 3408 | serial8250_isa_devs = NULL; |
| 3409 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 3410 | platform_driver_unregister(&serial8250_isa_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3411 | platform_device_unregister(isa_dev); |
| 3412 | |
Sean Young | 835d844 | 2012-09-07 19:06:23 +0100 | [diff] [blame] | 3413 | serial8250_pnp_exit(); |
| 3414 | |
David Miller | b70ac77 | 2008-10-13 10:36:31 +0100 | [diff] [blame] | 3415 | #ifdef CONFIG_SPARC |
| 3416 | sunserial_unregister_minors(&serial8250_reg, UART_NR); |
| 3417 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3418 | uart_unregister_driver(&serial8250_reg); |
David Miller | b70ac77 | 2008-10-13 10:36:31 +0100 | [diff] [blame] | 3419 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3420 | } |
| 3421 | |
| 3422 | module_init(serial8250_init); |
| 3423 | module_exit(serial8250_exit); |
| 3424 | |
| 3425 | EXPORT_SYMBOL(serial8250_suspend_port); |
| 3426 | EXPORT_SYMBOL(serial8250_resume_port); |
| 3427 | |
| 3428 | MODULE_LICENSE("GPL"); |
Adrian Bunk | d87a6d9 | 2008-07-16 21:53:31 +0100 | [diff] [blame] | 3429 | MODULE_DESCRIPTION("Generic 8250/16x50 serial driver"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3430 | |
| 3431 | module_param(share_irqs, uint, 0644); |
| 3432 | MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices" |
| 3433 | " (unsafe)"); |
| 3434 | |
Dave Jones | a61c2d7 | 2006-01-07 23:18:19 +0000 | [diff] [blame] | 3435 | module_param(nr_uarts, uint, 0644); |
| 3436 | MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); |
| 3437 | |
Chuck Ebbert | d41a4b5 | 2009-10-01 15:44:26 -0700 | [diff] [blame] | 3438 | module_param(skip_txen_test, uint, 0644); |
| 3439 | MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time"); |
| 3440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3441 | #ifdef CONFIG_SERIAL_8250_RSA |
| 3442 | module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444); |
| 3443 | MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); |
| 3444 | #endif |
| 3445 | MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); |
Josh Boyer | f2b8dfd | 2013-03-10 10:33:40 -0400 | [diff] [blame] | 3446 | |
Jiri Slaby | 9326b04 | 2013-03-19 11:34:57 +0100 | [diff] [blame] | 3447 | #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS |
Josh Boyer | f2b8dfd | 2013-03-10 10:33:40 -0400 | [diff] [blame] | 3448 | #ifndef MODULE |
| 3449 | /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name |
| 3450 | * working as well for the module options so we don't break people. We |
| 3451 | * need to keep the names identical and the convenient macros will happily |
| 3452 | * refuse to let us do that by failing the build with redefinition errors |
| 3453 | * of global variables. So we stick them inside a dummy function to avoid |
| 3454 | * those conflicts. The options still get parsed, and the redefined |
| 3455 | * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive. |
| 3456 | * |
| 3457 | * This is hacky. I'm sorry. |
| 3458 | */ |
| 3459 | static void __used s8250_options(void) |
| 3460 | { |
| 3461 | #undef MODULE_PARAM_PREFIX |
Jiri Slaby | 9196d8a | 2013-03-19 11:34:56 +0100 | [diff] [blame] | 3462 | #define MODULE_PARAM_PREFIX "8250_core." |
Josh Boyer | f2b8dfd | 2013-03-10 10:33:40 -0400 | [diff] [blame] | 3463 | |
| 3464 | module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644); |
| 3465 | module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644); |
| 3466 | module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644); |
| 3467 | #ifdef CONFIG_SERIAL_8250_RSA |
| 3468 | __module_param_call(MODULE_PARAM_PREFIX, probe_rsa, |
| 3469 | ¶m_array_ops, .arr = &__param_arr_probe_rsa, |
| 3470 | 0444, -1); |
| 3471 | #endif |
| 3472 | } |
| 3473 | #else |
Jiri Slaby | 9196d8a | 2013-03-19 11:34:56 +0100 | [diff] [blame] | 3474 | MODULE_ALIAS("8250_core"); |
Josh Boyer | f2b8dfd | 2013-03-10 10:33:40 -0400 | [diff] [blame] | 3475 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3476 | #endif |