Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * m32r_sio.c |
| 3 | * |
| 4 | * Driver for M32R serial ports |
| 5 | * |
| 6 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
| 7 | * Based on drivers/serial/8250.c. |
| 8 | * |
| 9 | * Copyright (C) 2001 Russell King. |
| 10 | * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * A note about mapbase / membase |
| 20 | * |
| 21 | * mapbase is the physical address of the IO port. Currently, we don't |
| 22 | * support this very well, and it may well be dropped from this driver |
| 23 | * in future. As such, mapbase should be NULL. |
| 24 | * |
| 25 | * membase is an 'ioremapped' cookie. This is compatible with the old |
| 26 | * serial.c driver, and is currently the preferred form. |
| 27 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #if defined(CONFIG_SERIAL_M32R_SIO_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 30 | #define SUPPORT_SYSRQ |
| 31 | #endif |
| 32 | |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/tty.h> |
Jiri Slaby | ee160a3 | 2011-09-01 16:20:57 +0200 | [diff] [blame] | 35 | #include <linux/tty_flip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/ioport.h> |
| 37 | #include <linux/init.h> |
| 38 | #include <linux/console.h> |
| 39 | #include <linux/sysrq.h> |
| 40 | #include <linux/serial.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/delay.h> |
| 42 | |
| 43 | #include <asm/m32r.h> |
| 44 | #include <asm/io.h> |
| 45 | #include <asm/irq.h> |
| 46 | |
| 47 | #define PORT_M32R_BASE PORT_M32R_SIO |
| 48 | #define PORT_INDEX(x) (x - PORT_M32R_BASE + 1) |
| 49 | #define BAUD_RATE 115200 |
| 50 | |
| 51 | #include <linux/serial_core.h> |
| 52 | #include "m32r_sio.h" |
| 53 | #include "m32r_sio_reg.h" |
| 54 | |
| 55 | /* |
| 56 | * Debugging. |
| 57 | */ |
| 58 | #if 0 |
| 59 | #define DEBUG_AUTOCONF(fmt...) printk(fmt) |
| 60 | #else |
| 61 | #define DEBUG_AUTOCONF(fmt...) do { } while (0) |
| 62 | #endif |
| 63 | |
| 64 | #if 0 |
| 65 | #define DEBUG_INTR(fmt...) printk(fmt) |
| 66 | #else |
| 67 | #define DEBUG_INTR(fmt...) do { } while (0) |
| 68 | #endif |
| 69 | |
| 70 | #define PASS_LIMIT 256 |
| 71 | |
Russell King | de6cc84 | 2006-08-30 15:30:39 +0100 | [diff] [blame] | 72 | #define BASE_BAUD 115200 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | /* Standard COM flags */ |
Russell King | 59a675b | 2006-02-05 10:52:29 +0000 | [diff] [blame] | 75 | #define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | /* |
| 78 | * SERIAL_PORT_DFNS tells us about built-in ports that have no |
| 79 | * standard enumeration mechanism. Platforms that can find all |
| 80 | * serial ports via mechanisms like ACPI or PCI need not supply it. |
| 81 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #if defined(CONFIG_PLAT_USRV) |
| 83 | |
| 84 | #define SERIAL_PORT_DFNS \ |
| 85 | /* UART CLK PORT IRQ FLAGS */ \ |
| 86 | { 0, BASE_BAUD, 0x3F8, PLD_IRQ_UART0, STD_COM_FLAGS }, /* ttyS0 */ \ |
| 87 | { 0, BASE_BAUD, 0x2F8, PLD_IRQ_UART1, STD_COM_FLAGS }, /* ttyS1 */ |
| 88 | |
| 89 | #else /* !CONFIG_PLAT_USRV */ |
| 90 | |
| 91 | #if defined(CONFIG_SERIAL_M32R_PLDSIO) |
| 92 | #define SERIAL_PORT_DFNS \ |
| 93 | { 0, BASE_BAUD, ((unsigned long)PLD_ESIO0CR), PLD_IRQ_SIO0_RCV, \ |
| 94 | STD_COM_FLAGS }, /* ttyS0 */ |
| 95 | #else |
| 96 | #define SERIAL_PORT_DFNS \ |
| 97 | { 0, BASE_BAUD, M32R_SIO_OFFSET, M32R_IRQ_SIO0_R, \ |
| 98 | STD_COM_FLAGS }, /* ttyS0 */ |
| 99 | #endif |
| 100 | |
| 101 | #endif /* !CONFIG_PLAT_USRV */ |
| 102 | |
| 103 | static struct old_serial_port old_serial_port[] = { |
Russell King | de6cc84 | 2006-08-30 15:30:39 +0100 | [diff] [blame] | 104 | SERIAL_PORT_DFNS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | }; |
| 106 | |
| 107 | #define UART_NR ARRAY_SIZE(old_serial_port) |
| 108 | |
| 109 | struct uart_sio_port { |
| 110 | struct uart_port port; |
| 111 | struct timer_list timer; /* "no irq" timer */ |
| 112 | struct list_head list; /* ports on this IRQ */ |
| 113 | unsigned short rev; |
| 114 | unsigned char acr; |
| 115 | unsigned char ier; |
| 116 | unsigned char lcr; |
| 117 | unsigned char mcr_mask; /* mask of user bits */ |
| 118 | unsigned char mcr_force; /* mask of forced bits */ |
| 119 | unsigned char lsr_break_flag; |
| 120 | |
| 121 | /* |
| 122 | * We provide a per-port pm hook. |
| 123 | */ |
| 124 | void (*pm)(struct uart_port *port, |
| 125 | unsigned int state, unsigned int old); |
| 126 | }; |
| 127 | |
| 128 | struct irq_info { |
| 129 | spinlock_t lock; |
| 130 | struct list_head *head; |
| 131 | }; |
| 132 | |
| 133 | static struct irq_info irq_lists[NR_IRQS]; |
| 134 | |
| 135 | /* |
| 136 | * Here we define the default xmit fifo size used for each type of UART. |
| 137 | */ |
| 138 | static const struct serial_uart_config uart_config[] = { |
| 139 | [PORT_UNKNOWN] = { |
| 140 | .name = "unknown", |
| 141 | .dfl_xmit_fifo_size = 1, |
| 142 | .flags = 0, |
| 143 | }, |
| 144 | [PORT_INDEX(PORT_M32R_SIO)] = { |
| 145 | .name = "M32RSIO", |
| 146 | .dfl_xmit_fifo_size = 1, |
| 147 | .flags = 0, |
| 148 | }, |
| 149 | }; |
| 150 | |
| 151 | #ifdef CONFIG_SERIAL_M32R_PLDSIO |
| 152 | |
| 153 | #define __sio_in(x) inw((unsigned long)(x)) |
| 154 | #define __sio_out(v,x) outw((v),(unsigned long)(x)) |
| 155 | |
| 156 | static inline void sio_set_baud_rate(unsigned long baud) |
| 157 | { |
| 158 | unsigned short sbaud; |
| 159 | sbaud = (boot_cpu_data.bus_clock / (baud * 4))-1; |
| 160 | __sio_out(sbaud, PLD_ESIO0BAUR); |
| 161 | } |
| 162 | |
| 163 | static void sio_reset(void) |
| 164 | { |
| 165 | unsigned short tmp; |
| 166 | |
| 167 | tmp = __sio_in(PLD_ESIO0RXB); |
| 168 | tmp = __sio_in(PLD_ESIO0RXB); |
| 169 | tmp = __sio_in(PLD_ESIO0CR); |
| 170 | sio_set_baud_rate(BAUD_RATE); |
| 171 | __sio_out(0x0300, PLD_ESIO0CR); |
| 172 | __sio_out(0x0003, PLD_ESIO0CR); |
| 173 | } |
| 174 | |
| 175 | static void sio_init(void) |
| 176 | { |
| 177 | unsigned short tmp; |
| 178 | |
| 179 | tmp = __sio_in(PLD_ESIO0RXB); |
| 180 | tmp = __sio_in(PLD_ESIO0RXB); |
| 181 | tmp = __sio_in(PLD_ESIO0CR); |
| 182 | __sio_out(0x0300, PLD_ESIO0CR); |
| 183 | __sio_out(0x0003, PLD_ESIO0CR); |
| 184 | } |
| 185 | |
| 186 | static void sio_error(int *status) |
| 187 | { |
| 188 | printk("SIO0 error[%04x]\n", *status); |
| 189 | do { |
| 190 | sio_init(); |
| 191 | } while ((*status = __sio_in(PLD_ESIO0CR)) != 3); |
| 192 | } |
| 193 | |
| 194 | #else /* not CONFIG_SERIAL_M32R_PLDSIO */ |
| 195 | |
| 196 | #define __sio_in(x) inl(x) |
| 197 | #define __sio_out(v,x) outl((v),(x)) |
| 198 | |
| 199 | static inline void sio_set_baud_rate(unsigned long baud) |
| 200 | { |
| 201 | unsigned long i, j; |
| 202 | |
| 203 | i = boot_cpu_data.bus_clock / (baud * 16); |
| 204 | j = (boot_cpu_data.bus_clock - (i * baud * 16)) / baud; |
| 205 | i -= 1; |
| 206 | j = (j + 1) >> 1; |
| 207 | |
| 208 | __sio_out(i, M32R_SIO0_BAUR_PORTL); |
| 209 | __sio_out(j, M32R_SIO0_RBAUR_PORTL); |
| 210 | } |
| 211 | |
| 212 | static void sio_reset(void) |
| 213 | { |
| 214 | __sio_out(0x00000300, M32R_SIO0_CR_PORTL); /* init status */ |
| 215 | __sio_out(0x00000800, M32R_SIO0_MOD1_PORTL); /* 8bit */ |
| 216 | __sio_out(0x00000080, M32R_SIO0_MOD0_PORTL); /* 1stop non */ |
| 217 | sio_set_baud_rate(BAUD_RATE); |
| 218 | __sio_out(0x00000000, M32R_SIO0_TRCR_PORTL); |
| 219 | __sio_out(0x00000003, M32R_SIO0_CR_PORTL); /* RXCEN */ |
| 220 | } |
| 221 | |
| 222 | static void sio_init(void) |
| 223 | { |
| 224 | unsigned int tmp; |
| 225 | |
| 226 | tmp = __sio_in(M32R_SIO0_RXB_PORTL); |
| 227 | tmp = __sio_in(M32R_SIO0_RXB_PORTL); |
| 228 | tmp = __sio_in(M32R_SIO0_STS_PORTL); |
| 229 | __sio_out(0x00000003, M32R_SIO0_CR_PORTL); |
| 230 | } |
| 231 | |
| 232 | static void sio_error(int *status) |
| 233 | { |
| 234 | printk("SIO0 error[%04x]\n", *status); |
| 235 | do { |
| 236 | sio_init(); |
| 237 | } while ((*status = __sio_in(M32R_SIO0_CR_PORTL)) != 3); |
| 238 | } |
| 239 | |
| 240 | #endif /* CONFIG_SERIAL_M32R_PLDSIO */ |
| 241 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 242 | static unsigned int sio_in(struct uart_sio_port *up, int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | { |
| 244 | return __sio_in(up->port.iobase + offset); |
| 245 | } |
| 246 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 247 | static void sio_out(struct uart_sio_port *up, int offset, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
| 249 | __sio_out(value, up->port.iobase + offset); |
| 250 | } |
| 251 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 252 | static unsigned int serial_in(struct uart_sio_port *up, int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | { |
| 254 | if (!offset) |
| 255 | return 0; |
| 256 | |
| 257 | return __sio_in(offset); |
| 258 | } |
| 259 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 260 | static void serial_out(struct uart_sio_port *up, int offset, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | { |
| 262 | if (!offset) |
| 263 | return; |
| 264 | |
| 265 | __sio_out(value, offset); |
| 266 | } |
| 267 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 268 | static void m32r_sio_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
| 270 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 271 | |
| 272 | if (up->ier & UART_IER_THRI) { |
| 273 | up->ier &= ~UART_IER_THRI; |
| 274 | serial_out(up, UART_IER, up->ier); |
| 275 | } |
| 276 | } |
| 277 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 278 | static void m32r_sio_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | { |
| 280 | #ifdef CONFIG_SERIAL_M32R_PLDSIO |
| 281 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 282 | struct circ_buf *xmit = &up->port.state->xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
| 284 | if (!(up->ier & UART_IER_THRI)) { |
| 285 | up->ier |= UART_IER_THRI; |
| 286 | serial_out(up, UART_IER, up->ier); |
| 287 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); |
| 288 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 289 | up->port.icount.tx++; |
| 290 | } |
| 291 | while((serial_in(up, UART_LSR) & UART_EMPTY) != UART_EMPTY); |
| 292 | #else |
| 293 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 294 | |
| 295 | if (!(up->ier & UART_IER_THRI)) { |
| 296 | up->ier |= UART_IER_THRI; |
| 297 | serial_out(up, UART_IER, up->ier); |
| 298 | } |
| 299 | #endif |
| 300 | } |
| 301 | |
| 302 | static void m32r_sio_stop_rx(struct uart_port *port) |
| 303 | { |
| 304 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 305 | |
| 306 | up->ier &= ~UART_IER_RLSI; |
| 307 | up->port.read_status_mask &= ~UART_LSR_DR; |
| 308 | serial_out(up, UART_IER, up->ier); |
| 309 | } |
| 310 | |
| 311 | static void m32r_sio_enable_ms(struct uart_port *port) |
| 312 | { |
| 313 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 314 | |
| 315 | up->ier |= UART_IER_MSI; |
| 316 | serial_out(up, UART_IER, up->ier); |
| 317 | } |
| 318 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 319 | static void receive_chars(struct uart_sio_port *up, int *status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 321 | struct tty_struct *tty = up->port.state->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | unsigned char ch; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 323 | unsigned char flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | int max_count = 256; |
| 325 | |
| 326 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | ch = sio_in(up, SIORXB); |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 328 | flag = TTY_NORMAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | up->port.icount.rx++; |
| 330 | |
| 331 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | |
| 332 | UART_LSR_FE | UART_LSR_OE))) { |
| 333 | /* |
| 334 | * For statistics only |
| 335 | */ |
| 336 | if (*status & UART_LSR_BI) { |
| 337 | *status &= ~(UART_LSR_FE | UART_LSR_PE); |
| 338 | up->port.icount.brk++; |
| 339 | /* |
| 340 | * We do the SysRQ and SAK checking |
| 341 | * here because otherwise the break |
| 342 | * may get masked by ignore_status_mask |
| 343 | * or read_status_mask. |
| 344 | */ |
| 345 | if (uart_handle_break(&up->port)) |
| 346 | goto ignore_char; |
| 347 | } else if (*status & UART_LSR_PE) |
| 348 | up->port.icount.parity++; |
| 349 | else if (*status & UART_LSR_FE) |
| 350 | up->port.icount.frame++; |
| 351 | if (*status & UART_LSR_OE) |
| 352 | up->port.icount.overrun++; |
| 353 | |
| 354 | /* |
| 355 | * Mask off conditions which should be ingored. |
| 356 | */ |
| 357 | *status &= up->port.read_status_mask; |
| 358 | |
| 359 | if (up->port.line == up->port.cons->index) { |
| 360 | /* Recover the break flag from console xmit */ |
| 361 | *status |= up->lsr_break_flag; |
| 362 | up->lsr_break_flag = 0; |
| 363 | } |
| 364 | |
| 365 | if (*status & UART_LSR_BI) { |
| 366 | DEBUG_INTR("handling break...."); |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 367 | flag = TTY_BREAK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | } else if (*status & UART_LSR_PE) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 369 | flag = TTY_PARITY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | else if (*status & UART_LSR_FE) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 371 | flag = TTY_FRAME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 373 | if (uart_handle_sysrq_char(&up->port, ch)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | goto ignore_char; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 375 | if ((*status & up->port.ignore_status_mask) == 0) |
| 376 | tty_insert_flip_char(tty, ch, flag); |
| 377 | |
| 378 | if (*status & UART_LSR_OE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | /* |
| 380 | * Overrun is special, since it's reported |
| 381 | * immediately, and doesn't affect the current |
| 382 | * character. |
| 383 | */ |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 384 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | ignore_char: |
| 387 | *status = serial_in(up, UART_LSR); |
| 388 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); |
| 389 | tty_flip_buffer_push(tty); |
| 390 | } |
| 391 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 392 | static void transmit_chars(struct uart_sio_port *up) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 394 | struct circ_buf *xmit = &up->port.state->xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | int count; |
| 396 | |
| 397 | if (up->port.x_char) { |
| 398 | #ifndef CONFIG_SERIAL_M32R_PLDSIO /* XXX */ |
| 399 | serial_out(up, UART_TX, up->port.x_char); |
| 400 | #endif |
| 401 | up->port.icount.tx++; |
| 402 | up->port.x_char = 0; |
| 403 | return; |
| 404 | } |
| 405 | if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 406 | m32r_sio_stop_tx(&up->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | return; |
| 408 | } |
| 409 | |
| 410 | count = up->port.fifosize; |
| 411 | do { |
| 412 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); |
| 413 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 414 | up->port.icount.tx++; |
| 415 | if (uart_circ_empty(xmit)) |
| 416 | break; |
Julia Lawall | 022d917 | 2008-03-04 14:29:19 -0800 | [diff] [blame] | 417 | while (!(serial_in(up, UART_LSR) & UART_LSR_THRE)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
| 419 | } while (--count > 0); |
| 420 | |
| 421 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 422 | uart_write_wakeup(&up->port); |
| 423 | |
| 424 | DEBUG_INTR("THRE..."); |
| 425 | |
| 426 | if (uart_circ_empty(xmit)) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 427 | m32r_sio_stop_tx(&up->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | /* |
| 431 | * This handles the interrupt from one port. |
| 432 | */ |
| 433 | static inline void m32r_sio_handle_port(struct uart_sio_port *up, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 434 | unsigned int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | { |
| 436 | DEBUG_INTR("status = %x...", status); |
| 437 | |
| 438 | if (status & 0x04) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 439 | receive_chars(up, &status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | if (status & 0x01) |
| 441 | transmit_chars(up); |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * This is the serial driver's interrupt routine. |
| 446 | * |
| 447 | * Arjan thinks the old way was overly complex, so it got simplified. |
| 448 | * Alan disagrees, saying that need the complexity to handle the weird |
| 449 | * nature of ISA shared interrupts. (This is a special exception.) |
| 450 | * |
| 451 | * In order to handle ISA shared interrupts properly, we need to check |
| 452 | * that all ports have been serviced, and therefore the ISA interrupt |
| 453 | * line has been de-asserted. |
| 454 | * |
| 455 | * This means we need to loop through all ports. checking that they |
| 456 | * don't have an interrupt pending. |
| 457 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 458 | static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | { |
| 460 | struct irq_info *i = dev_id; |
| 461 | struct list_head *l, *end = NULL; |
| 462 | int pass_counter = 0; |
| 463 | |
| 464 | DEBUG_INTR("m32r_sio_interrupt(%d)...", irq); |
| 465 | |
| 466 | #ifdef CONFIG_SERIAL_M32R_PLDSIO |
| 467 | // if (irq == PLD_IRQ_SIO0_SND) |
| 468 | // irq = PLD_IRQ_SIO0_RCV; |
| 469 | #else |
| 470 | if (irq == M32R_IRQ_SIO0_S) |
| 471 | irq = M32R_IRQ_SIO0_R; |
| 472 | #endif |
| 473 | |
| 474 | spin_lock(&i->lock); |
| 475 | |
| 476 | l = i->head; |
| 477 | do { |
| 478 | struct uart_sio_port *up; |
| 479 | unsigned int sts; |
| 480 | |
| 481 | up = list_entry(l, struct uart_sio_port, list); |
| 482 | |
| 483 | sts = sio_in(up, SIOSTS); |
| 484 | if (sts & 0x5) { |
| 485 | spin_lock(&up->port.lock); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 486 | m32r_sio_handle_port(up, sts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | spin_unlock(&up->port.lock); |
| 488 | |
| 489 | end = NULL; |
| 490 | } else if (end == NULL) |
| 491 | end = l; |
| 492 | |
| 493 | l = l->next; |
| 494 | |
| 495 | if (l == i->head && pass_counter++ > PASS_LIMIT) { |
| 496 | if (sts & 0xe0) |
| 497 | sio_error(&sts); |
| 498 | break; |
| 499 | } |
| 500 | } while (l != end); |
| 501 | |
| 502 | spin_unlock(&i->lock); |
| 503 | |
| 504 | DEBUG_INTR("end.\n"); |
| 505 | |
| 506 | return IRQ_HANDLED; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * To support ISA shared interrupts, we need to have one interrupt |
| 511 | * handler that ensures that the IRQ line has been deasserted |
| 512 | * before returning. Failing to do this will result in the IRQ |
| 513 | * line being stuck active, and, since ISA irqs are edge triggered, |
| 514 | * no more IRQs will be seen. |
| 515 | */ |
| 516 | static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up) |
| 517 | { |
| 518 | spin_lock_irq(&i->lock); |
| 519 | |
| 520 | if (!list_empty(i->head)) { |
| 521 | if (i->head == &up->list) |
| 522 | i->head = i->head->next; |
| 523 | list_del(&up->list); |
| 524 | } else { |
| 525 | BUG_ON(i->head != &up->list); |
| 526 | i->head = NULL; |
| 527 | } |
| 528 | |
| 529 | spin_unlock_irq(&i->lock); |
| 530 | } |
| 531 | |
| 532 | static int serial_link_irq_chain(struct uart_sio_port *up) |
| 533 | { |
| 534 | struct irq_info *i = irq_lists + up->port.irq; |
Hirokazu Takata | dab8f49 | 2007-10-16 01:26:36 -0700 | [diff] [blame] | 535 | int ret, irq_flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
| 537 | spin_lock_irq(&i->lock); |
| 538 | |
| 539 | if (i->head) { |
| 540 | list_add(&up->list, i->head); |
| 541 | spin_unlock_irq(&i->lock); |
| 542 | |
| 543 | ret = 0; |
| 544 | } else { |
| 545 | INIT_LIST_HEAD(&up->list); |
| 546 | i->head = &up->list; |
| 547 | spin_unlock_irq(&i->lock); |
| 548 | |
| 549 | ret = request_irq(up->port.irq, m32r_sio_interrupt, |
| 550 | irq_flags, "SIO0-RX", i); |
| 551 | ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt, |
| 552 | irq_flags, "SIO0-TX", i); |
| 553 | if (ret < 0) |
| 554 | serial_do_unlink(i, up); |
| 555 | } |
| 556 | |
| 557 | return ret; |
| 558 | } |
| 559 | |
| 560 | static void serial_unlink_irq_chain(struct uart_sio_port *up) |
| 561 | { |
| 562 | struct irq_info *i = irq_lists + up->port.irq; |
| 563 | |
| 564 | BUG_ON(i->head == NULL); |
| 565 | |
| 566 | if (list_empty(i->head)) { |
| 567 | free_irq(up->port.irq, i); |
| 568 | free_irq(up->port.irq + 1, i); |
| 569 | } |
| 570 | |
| 571 | serial_do_unlink(i, up); |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * This function is used to handle ports that do not have an interrupt. |
| 576 | */ |
| 577 | static void m32r_sio_timeout(unsigned long data) |
| 578 | { |
| 579 | struct uart_sio_port *up = (struct uart_sio_port *)data; |
| 580 | unsigned int timeout; |
| 581 | unsigned int sts; |
| 582 | |
| 583 | sts = sio_in(up, SIOSTS); |
| 584 | if (sts & 0x5) { |
| 585 | spin_lock(&up->port.lock); |
Al Viro | 9c8e7f5 | 2006-10-07 16:29:18 +0100 | [diff] [blame] | 586 | m32r_sio_handle_port(up, sts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | spin_unlock(&up->port.lock); |
| 588 | } |
| 589 | |
| 590 | timeout = up->port.timeout; |
| 591 | timeout = timeout > 6 ? (timeout / 2 - 2) : 1; |
| 592 | mod_timer(&up->timer, jiffies + timeout); |
| 593 | } |
| 594 | |
| 595 | static unsigned int m32r_sio_tx_empty(struct uart_port *port) |
| 596 | { |
| 597 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 598 | unsigned long flags; |
| 599 | unsigned int ret; |
| 600 | |
| 601 | spin_lock_irqsave(&up->port.lock, flags); |
| 602 | ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; |
| 603 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 604 | |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | static unsigned int m32r_sio_get_mctrl(struct uart_port *port) |
| 609 | { |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 614 | { |
| 615 | |
| 616 | } |
| 617 | |
| 618 | static void m32r_sio_break_ctl(struct uart_port *port, int break_state) |
| 619 | { |
| 620 | |
| 621 | } |
| 622 | |
| 623 | static int m32r_sio_startup(struct uart_port *port) |
| 624 | { |
| 625 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 626 | int retval; |
| 627 | |
| 628 | sio_init(); |
| 629 | |
| 630 | /* |
| 631 | * If the "interrupt" for this port doesn't correspond with any |
| 632 | * hardware interrupt, we use a timer-based system. The original |
| 633 | * driver used to do this with IRQ0. |
| 634 | */ |
Alan Cox | d4e33fa | 2012-01-26 17:44:09 +0000 | [diff] [blame] | 635 | if (!up->port.irq) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | unsigned int timeout = up->port.timeout; |
| 637 | |
| 638 | timeout = timeout > 6 ? (timeout / 2 - 2) : 1; |
| 639 | |
| 640 | up->timer.data = (unsigned long)up; |
| 641 | mod_timer(&up->timer, jiffies + timeout); |
| 642 | } else { |
| 643 | retval = serial_link_irq_chain(up); |
| 644 | if (retval) |
| 645 | return retval; |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Finally, enable interrupts. Note: Modem status interrupts |
| 650 | * are set via set_termios(), which will be occurring imminently |
| 651 | * anyway, so we don't enable them here. |
| 652 | * - M32R_SIO: 0x0c |
| 653 | * - M32R_PLDSIO: 0x04 |
| 654 | */ |
| 655 | up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; |
| 656 | sio_out(up, SIOTRCR, up->ier); |
| 657 | |
| 658 | /* |
| 659 | * And clear the interrupt registers again for luck. |
| 660 | */ |
| 661 | sio_reset(); |
| 662 | |
| 663 | return 0; |
| 664 | } |
| 665 | |
| 666 | static void m32r_sio_shutdown(struct uart_port *port) |
| 667 | { |
| 668 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 669 | |
| 670 | /* |
| 671 | * Disable interrupts from this port |
| 672 | */ |
| 673 | up->ier = 0; |
| 674 | sio_out(up, SIOTRCR, 0); |
| 675 | |
| 676 | /* |
| 677 | * Disable break condition and FIFOs |
| 678 | */ |
| 679 | |
| 680 | sio_init(); |
| 681 | |
Alan Cox | d4e33fa | 2012-01-26 17:44:09 +0000 | [diff] [blame] | 682 | if (!up->port.irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | del_timer_sync(&up->timer); |
| 684 | else |
| 685 | serial_unlink_irq_chain(up); |
| 686 | } |
| 687 | |
| 688 | static unsigned int m32r_sio_get_divisor(struct uart_port *port, |
| 689 | unsigned int baud) |
| 690 | { |
| 691 | return uart_get_divisor(port, baud); |
| 692 | } |
| 693 | |
| 694 | static void m32r_sio_set_termios(struct uart_port *port, |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 695 | struct ktermios *termios, struct ktermios *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | { |
| 697 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 698 | unsigned char cval = 0; |
| 699 | unsigned long flags; |
| 700 | unsigned int baud, quot; |
| 701 | |
| 702 | switch (termios->c_cflag & CSIZE) { |
| 703 | case CS5: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 704 | cval = UART_LCR_WLEN5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | break; |
| 706 | case CS6: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 707 | cval = UART_LCR_WLEN6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | break; |
| 709 | case CS7: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 710 | cval = UART_LCR_WLEN7; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | break; |
| 712 | default: |
| 713 | case CS8: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 714 | cval = UART_LCR_WLEN8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | break; |
| 716 | } |
| 717 | |
| 718 | if (termios->c_cflag & CSTOPB) |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 719 | cval |= UART_LCR_STOP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | if (termios->c_cflag & PARENB) |
| 721 | cval |= UART_LCR_PARITY; |
| 722 | if (!(termios->c_cflag & PARODD)) |
| 723 | cval |= UART_LCR_EPAR; |
| 724 | #ifdef CMSPAR |
| 725 | if (termios->c_cflag & CMSPAR) |
| 726 | cval |= UART_LCR_SPAR; |
| 727 | #endif |
| 728 | |
| 729 | /* |
| 730 | * Ask the core to calculate the divisor for us. |
| 731 | */ |
| 732 | #ifdef CONFIG_SERIAL_M32R_PLDSIO |
| 733 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4); |
| 734 | #else |
| 735 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); |
| 736 | #endif |
| 737 | quot = m32r_sio_get_divisor(port, baud); |
| 738 | |
| 739 | /* |
| 740 | * Ok, we're now changing the port state. Do it with |
| 741 | * interrupts disabled. |
| 742 | */ |
| 743 | spin_lock_irqsave(&up->port.lock, flags); |
| 744 | |
| 745 | sio_set_baud_rate(baud); |
| 746 | |
| 747 | /* |
| 748 | * Update the per-port timeout. |
| 749 | */ |
| 750 | uart_update_timeout(port, termios->c_cflag, baud); |
| 751 | |
| 752 | up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; |
| 753 | if (termios->c_iflag & INPCK) |
| 754 | up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
| 755 | if (termios->c_iflag & (BRKINT | PARMRK)) |
| 756 | up->port.read_status_mask |= UART_LSR_BI; |
| 757 | |
| 758 | /* |
| 759 | * Characteres to ignore |
| 760 | */ |
| 761 | up->port.ignore_status_mask = 0; |
| 762 | if (termios->c_iflag & IGNPAR) |
| 763 | up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
| 764 | if (termios->c_iflag & IGNBRK) { |
| 765 | up->port.ignore_status_mask |= UART_LSR_BI; |
| 766 | /* |
| 767 | * If we're ignoring parity and break indicators, |
| 768 | * ignore overruns too (for real raw support). |
| 769 | */ |
| 770 | if (termios->c_iflag & IGNPAR) |
| 771 | up->port.ignore_status_mask |= UART_LSR_OE; |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * ignore all characters if CREAD is not set |
| 776 | */ |
| 777 | if ((termios->c_cflag & CREAD) == 0) |
| 778 | up->port.ignore_status_mask |= UART_LSR_DR; |
| 779 | |
| 780 | /* |
| 781 | * CTS flow control flag and modem status interrupts |
| 782 | */ |
| 783 | up->ier &= ~UART_IER_MSI; |
| 784 | if (UART_ENABLE_MS(&up->port, termios->c_cflag)) |
| 785 | up->ier |= UART_IER_MSI; |
| 786 | |
| 787 | serial_out(up, UART_IER, up->ier); |
| 788 | |
| 789 | up->lcr = cval; /* Save LCR */ |
| 790 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 791 | } |
| 792 | |
| 793 | static void m32r_sio_pm(struct uart_port *port, unsigned int state, |
| 794 | unsigned int oldstate) |
| 795 | { |
| 796 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 797 | |
| 798 | if (up->pm) |
| 799 | up->pm(port, state, oldstate); |
| 800 | } |
| 801 | |
| 802 | /* |
| 803 | * Resource handling. This is complicated by the fact that resources |
| 804 | * depend on the port type. Maybe we should be claiming the standard |
| 805 | * 8250 ports, and then trying to get other resources as necessary? |
| 806 | */ |
| 807 | static int |
| 808 | m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res) |
| 809 | { |
| 810 | unsigned int size = 8 << up->port.regshift; |
| 811 | #ifndef CONFIG_SERIAL_M32R_PLDSIO |
| 812 | unsigned long start; |
| 813 | #endif |
| 814 | int ret = 0; |
| 815 | |
| 816 | switch (up->port.iotype) { |
| 817 | case UPIO_MEM: |
| 818 | if (up->port.mapbase) { |
| 819 | #ifdef CONFIG_SERIAL_M32R_PLDSIO |
| 820 | *res = request_mem_region(up->port.mapbase, size, "serial"); |
| 821 | #else |
| 822 | start = up->port.mapbase; |
| 823 | *res = request_mem_region(start, size, "serial"); |
| 824 | #endif |
| 825 | if (!*res) |
| 826 | ret = -EBUSY; |
| 827 | } |
| 828 | break; |
| 829 | |
| 830 | case UPIO_PORT: |
| 831 | *res = request_region(up->port.iobase, size, "serial"); |
| 832 | if (!*res) |
| 833 | ret = -EBUSY; |
| 834 | break; |
| 835 | } |
| 836 | return ret; |
| 837 | } |
| 838 | |
| 839 | static void m32r_sio_release_port(struct uart_port *port) |
| 840 | { |
| 841 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 842 | unsigned long start, offset = 0, size = 0; |
| 843 | |
| 844 | size <<= up->port.regshift; |
| 845 | |
| 846 | switch (up->port.iotype) { |
| 847 | case UPIO_MEM: |
| 848 | if (up->port.mapbase) { |
| 849 | /* |
| 850 | * Unmap the area. |
| 851 | */ |
| 852 | iounmap(up->port.membase); |
| 853 | up->port.membase = NULL; |
| 854 | |
| 855 | start = up->port.mapbase; |
| 856 | |
| 857 | if (size) |
| 858 | release_mem_region(start + offset, size); |
| 859 | release_mem_region(start, 8 << up->port.regshift); |
| 860 | } |
| 861 | break; |
| 862 | |
| 863 | case UPIO_PORT: |
| 864 | start = up->port.iobase; |
| 865 | |
| 866 | if (size) |
| 867 | release_region(start + offset, size); |
| 868 | release_region(start + offset, 8 << up->port.regshift); |
| 869 | break; |
| 870 | |
| 871 | default: |
| 872 | break; |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | static int m32r_sio_request_port(struct uart_port *port) |
| 877 | { |
| 878 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 879 | struct resource *res = NULL; |
| 880 | int ret = 0; |
| 881 | |
| 882 | ret = m32r_sio_request_std_resource(up, &res); |
| 883 | |
| 884 | /* |
| 885 | * If we have a mapbase, then request that as well. |
| 886 | */ |
| 887 | if (ret == 0 && up->port.flags & UPF_IOREMAP) { |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 888 | int size = resource_size(res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
| 890 | up->port.membase = ioremap(up->port.mapbase, size); |
| 891 | if (!up->port.membase) |
| 892 | ret = -ENOMEM; |
| 893 | } |
| 894 | |
| 895 | if (ret < 0) { |
| 896 | if (res) |
| 897 | release_resource(res); |
| 898 | } |
| 899 | |
| 900 | return ret; |
| 901 | } |
| 902 | |
KOSAKI Motohiro | 1e806c5 | 2011-05-26 16:25:00 -0700 | [diff] [blame] | 903 | static void m32r_sio_config_port(struct uart_port *port, int unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | { |
| 905 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
KOSAKI Motohiro | 1e806c5 | 2011-05-26 16:25:00 -0700 | [diff] [blame] | 906 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | spin_lock_irqsave(&up->port.lock, flags); |
| 909 | |
| 910 | up->port.type = (PORT_M32R_SIO - PORT_M32R_BASE + 1); |
| 911 | up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size; |
| 912 | |
| 913 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 914 | } |
| 915 | |
| 916 | static int |
| 917 | m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 918 | { |
Yinghai Lu | a62c413 | 2008-08-19 20:49:55 -0700 | [diff] [blame] | 919 | if (ser->irq >= nr_irqs || ser->irq < 0 || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | ser->baud_base < 9600 || ser->type < PORT_UNKNOWN || |
| 921 | ser->type >= ARRAY_SIZE(uart_config)) |
| 922 | return -EINVAL; |
| 923 | return 0; |
| 924 | } |
| 925 | |
| 926 | static const char * |
| 927 | m32r_sio_type(struct uart_port *port) |
| 928 | { |
| 929 | int type = port->type; |
| 930 | |
| 931 | if (type >= ARRAY_SIZE(uart_config)) |
| 932 | type = 0; |
| 933 | return uart_config[type].name; |
| 934 | } |
| 935 | |
| 936 | static struct uart_ops m32r_sio_pops = { |
| 937 | .tx_empty = m32r_sio_tx_empty, |
| 938 | .set_mctrl = m32r_sio_set_mctrl, |
| 939 | .get_mctrl = m32r_sio_get_mctrl, |
| 940 | .stop_tx = m32r_sio_stop_tx, |
| 941 | .start_tx = m32r_sio_start_tx, |
| 942 | .stop_rx = m32r_sio_stop_rx, |
| 943 | .enable_ms = m32r_sio_enable_ms, |
| 944 | .break_ctl = m32r_sio_break_ctl, |
| 945 | .startup = m32r_sio_startup, |
| 946 | .shutdown = m32r_sio_shutdown, |
| 947 | .set_termios = m32r_sio_set_termios, |
| 948 | .pm = m32r_sio_pm, |
| 949 | .type = m32r_sio_type, |
| 950 | .release_port = m32r_sio_release_port, |
| 951 | .request_port = m32r_sio_request_port, |
| 952 | .config_port = m32r_sio_config_port, |
| 953 | .verify_port = m32r_sio_verify_port, |
| 954 | }; |
| 955 | |
| 956 | static struct uart_sio_port m32r_sio_ports[UART_NR]; |
| 957 | |
| 958 | static void __init m32r_sio_init_ports(void) |
| 959 | { |
| 960 | struct uart_sio_port *up; |
| 961 | static int first = 1; |
| 962 | int i; |
| 963 | |
| 964 | if (!first) |
| 965 | return; |
| 966 | first = 0; |
| 967 | |
| 968 | for (i = 0, up = m32r_sio_ports; i < ARRAY_SIZE(old_serial_port); |
| 969 | i++, up++) { |
| 970 | up->port.iobase = old_serial_port[i].port; |
| 971 | up->port.irq = irq_canonicalize(old_serial_port[i].irq); |
| 972 | up->port.uartclk = old_serial_port[i].baud_base * 16; |
| 973 | up->port.flags = old_serial_port[i].flags; |
| 974 | up->port.membase = old_serial_port[i].iomem_base; |
| 975 | up->port.iotype = old_serial_port[i].io_type; |
| 976 | up->port.regshift = old_serial_port[i].iomem_reg_shift; |
| 977 | up->port.ops = &m32r_sio_pops; |
| 978 | } |
| 979 | } |
| 980 | |
| 981 | static void __init m32r_sio_register_ports(struct uart_driver *drv) |
| 982 | { |
| 983 | int i; |
| 984 | |
| 985 | m32r_sio_init_ports(); |
| 986 | |
| 987 | for (i = 0; i < UART_NR; i++) { |
| 988 | struct uart_sio_port *up = &m32r_sio_ports[i]; |
| 989 | |
| 990 | up->port.line = i; |
| 991 | up->port.ops = &m32r_sio_pops; |
| 992 | init_timer(&up->timer); |
| 993 | up->timer.function = m32r_sio_timeout; |
| 994 | |
Paul Gortmaker | 5908738 | 2012-01-04 15:16:24 -0500 | [diff] [blame] | 995 | up->mcr_mask = ~0; |
| 996 | up->mcr_force = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
| 998 | uart_add_one_port(drv, &up->port); |
| 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | #ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE |
| 1003 | |
| 1004 | /* |
| 1005 | * Wait for transmitter & holding register to empty |
| 1006 | */ |
| 1007 | static inline void wait_for_xmitr(struct uart_sio_port *up) |
| 1008 | { |
| 1009 | unsigned int status, tmout = 10000; |
| 1010 | |
| 1011 | /* Wait up to 10ms for the character(s) to be sent. */ |
| 1012 | do { |
| 1013 | status = sio_in(up, SIOSTS); |
| 1014 | |
| 1015 | if (--tmout == 0) |
| 1016 | break; |
| 1017 | udelay(1); |
| 1018 | } while ((status & UART_EMPTY) != UART_EMPTY); |
| 1019 | |
| 1020 | /* Wait up to 1s for flow control if necessary */ |
| 1021 | if (up->port.flags & UPF_CONS_FLOW) { |
| 1022 | tmout = 1000000; |
| 1023 | while (--tmout) |
| 1024 | udelay(1); |
| 1025 | } |
| 1026 | } |
| 1027 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1028 | static void m32r_sio_console_putchar(struct uart_port *port, int ch) |
| 1029 | { |
| 1030 | struct uart_sio_port *up = (struct uart_sio_port *)port; |
| 1031 | |
| 1032 | wait_for_xmitr(up); |
| 1033 | sio_out(up, SIOTXB, ch); |
| 1034 | } |
| 1035 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | /* |
| 1037 | * Print a string to the serial port trying not to disturb |
| 1038 | * any possible real use of the port... |
| 1039 | * |
| 1040 | * The console_lock must be held when we get here. |
| 1041 | */ |
| 1042 | static void m32r_sio_console_write(struct console *co, const char *s, |
| 1043 | unsigned int count) |
| 1044 | { |
| 1045 | struct uart_sio_port *up = &m32r_sio_ports[co->index]; |
| 1046 | unsigned int ier; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
| 1048 | /* |
| 1049 | * First save the UER then disable the interrupts |
| 1050 | */ |
| 1051 | ier = sio_in(up, SIOTRCR); |
| 1052 | sio_out(up, SIOTRCR, 0); |
| 1053 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1054 | uart_console_write(&up->port, s, count, m32r_sio_console_putchar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | |
| 1056 | /* |
| 1057 | * Finally, wait for transmitter to become empty |
| 1058 | * and restore the IER |
| 1059 | */ |
| 1060 | wait_for_xmitr(up); |
| 1061 | sio_out(up, SIOTRCR, ier); |
| 1062 | } |
| 1063 | |
| 1064 | static int __init m32r_sio_console_setup(struct console *co, char *options) |
| 1065 | { |
| 1066 | struct uart_port *port; |
| 1067 | int baud = 9600; |
| 1068 | int bits = 8; |
| 1069 | int parity = 'n'; |
| 1070 | int flow = 'n'; |
| 1071 | |
| 1072 | /* |
| 1073 | * Check whether an invalid uart number has been specified, and |
| 1074 | * if so, search for the first available port that does have |
| 1075 | * console support. |
| 1076 | */ |
| 1077 | if (co->index >= UART_NR) |
| 1078 | co->index = 0; |
| 1079 | port = &m32r_sio_ports[co->index].port; |
| 1080 | |
| 1081 | /* |
| 1082 | * Temporary fix. |
| 1083 | */ |
| 1084 | spin_lock_init(&port->lock); |
| 1085 | |
| 1086 | if (options) |
| 1087 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 1088 | |
| 1089 | return uart_set_options(port, co, baud, parity, bits, flow); |
| 1090 | } |
| 1091 | |
Al Viro | a828b8e | 2005-08-23 22:47:27 +0100 | [diff] [blame] | 1092 | static struct uart_driver m32r_sio_reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | static struct console m32r_sio_console = { |
| 1094 | .name = "ttyS", |
| 1095 | .write = m32r_sio_console_write, |
| 1096 | .device = uart_console_device, |
| 1097 | .setup = m32r_sio_console_setup, |
| 1098 | .flags = CON_PRINTBUFFER, |
| 1099 | .index = -1, |
| 1100 | .data = &m32r_sio_reg, |
| 1101 | }; |
| 1102 | |
| 1103 | static int __init m32r_sio_console_init(void) |
| 1104 | { |
| 1105 | sio_reset(); |
| 1106 | sio_init(); |
| 1107 | m32r_sio_init_ports(); |
| 1108 | register_console(&m32r_sio_console); |
| 1109 | return 0; |
| 1110 | } |
| 1111 | console_initcall(m32r_sio_console_init); |
| 1112 | |
| 1113 | #define M32R_SIO_CONSOLE &m32r_sio_console |
| 1114 | #else |
| 1115 | #define M32R_SIO_CONSOLE NULL |
| 1116 | #endif |
| 1117 | |
| 1118 | static struct uart_driver m32r_sio_reg = { |
| 1119 | .owner = THIS_MODULE, |
| 1120 | .driver_name = "sio", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | .dev_name = "ttyS", |
| 1122 | .major = TTY_MAJOR, |
| 1123 | .minor = 64, |
| 1124 | .nr = UART_NR, |
| 1125 | .cons = M32R_SIO_CONSOLE, |
| 1126 | }; |
| 1127 | |
| 1128 | /** |
| 1129 | * m32r_sio_suspend_port - suspend one serial port |
| 1130 | * @line: serial line number |
| 1131 | * |
| 1132 | * Suspend one serial port. |
| 1133 | */ |
| 1134 | void m32r_sio_suspend_port(int line) |
| 1135 | { |
| 1136 | uart_suspend_port(&m32r_sio_reg, &m32r_sio_ports[line].port); |
| 1137 | } |
| 1138 | |
| 1139 | /** |
| 1140 | * m32r_sio_resume_port - resume one serial port |
| 1141 | * @line: serial line number |
| 1142 | * |
| 1143 | * Resume one serial port. |
| 1144 | */ |
| 1145 | void m32r_sio_resume_port(int line) |
| 1146 | { |
| 1147 | uart_resume_port(&m32r_sio_reg, &m32r_sio_ports[line].port); |
| 1148 | } |
| 1149 | |
| 1150 | static int __init m32r_sio_init(void) |
| 1151 | { |
| 1152 | int ret, i; |
| 1153 | |
Adrian Bunk | d87a6d9 | 2008-07-16 21:53:31 +0100 | [diff] [blame] | 1154 | printk(KERN_INFO "Serial: M32R SIO driver\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
Yinghai Lu | a62c413 | 2008-08-19 20:49:55 -0700 | [diff] [blame] | 1156 | for (i = 0; i < nr_irqs; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | spin_lock_init(&irq_lists[i].lock); |
| 1158 | |
| 1159 | ret = uart_register_driver(&m32r_sio_reg); |
| 1160 | if (ret >= 0) |
| 1161 | m32r_sio_register_ports(&m32r_sio_reg); |
| 1162 | |
| 1163 | return ret; |
| 1164 | } |
| 1165 | |
| 1166 | static void __exit m32r_sio_exit(void) |
| 1167 | { |
| 1168 | int i; |
| 1169 | |
| 1170 | for (i = 0; i < UART_NR; i++) |
| 1171 | uart_remove_one_port(&m32r_sio_reg, &m32r_sio_ports[i].port); |
| 1172 | |
| 1173 | uart_unregister_driver(&m32r_sio_reg); |
| 1174 | } |
| 1175 | |
| 1176 | module_init(m32r_sio_init); |
| 1177 | module_exit(m32r_sio_exit); |
| 1178 | |
| 1179 | EXPORT_SYMBOL(m32r_sio_suspend_port); |
| 1180 | EXPORT_SYMBOL(m32r_sio_resume_port); |
| 1181 | |
| 1182 | MODULE_LICENSE("GPL"); |
Adrian Bunk | d87a6d9 | 2008-07-16 21:53:31 +0100 | [diff] [blame] | 1183 | MODULE_DESCRIPTION("Generic M32R SIO serial driver"); |