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 | * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO) |
| 3 | * |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 4 | * Copyright (C) 2002 - 2011 Paul Mundt |
Markus Brunner | 3ea6bc3 | 2007-08-20 08:59:33 +0900 | [diff] [blame] | 5 | * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * based off of the old drivers/char/sh-sci.c by: |
| 8 | * |
| 9 | * Copyright (C) 1999, 2000 Niibe Yutaka |
| 10 | * Copyright (C) 2000 Sugioka Toshinobu |
| 11 | * Modified to support multiple serial ports. Stuart Menefy (May 2000). |
| 12 | * Modified to support SecureEdge. David McCullough (2002) |
| 13 | * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003). |
Magnus Damm | d89ddd1 | 2007-07-25 11:42:56 +0900 | [diff] [blame] | 14 | * Removed SH7300 support (Jul 2007). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | * |
| 16 | * This file is subject to the terms and conditions of the GNU General Public |
| 17 | * License. See the file "COPYING" in the main directory of this archive |
| 18 | * for more details. |
| 19 | */ |
Paul Mundt | 0b3d4ef | 2007-03-14 13:22:37 +0900 | [diff] [blame] | 20 | #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 21 | #define SUPPORT_SYSRQ |
| 22 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | #undef DEBUG |
| 25 | |
Paul Mundt | 85f094e | 2008-04-25 16:04:20 +0900 | [diff] [blame] | 26 | #include <linux/clk.h> |
Laurent Pinchart | 8fb9631 | 2013-12-06 10:59:10 +0100 | [diff] [blame] | 27 | #include <linux/console.h> |
Paul Mundt | fa5da2f | 2007-03-08 17:27:37 +0900 | [diff] [blame] | 28 | #include <linux/ctype.h> |
Laurent Pinchart | 8fb9631 | 2013-12-06 10:59:10 +0100 | [diff] [blame] | 29 | #include <linux/cpufreq.h> |
| 30 | #include <linux/delay.h> |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 31 | #include <linux/dmaengine.h> |
Magnus Damm | 5beabc7 | 2011-08-02 09:42:54 +0000 | [diff] [blame] | 32 | #include <linux/dma-mapping.h> |
Laurent Pinchart | 8fb9631 | 2013-12-06 10:59:10 +0100 | [diff] [blame] | 33 | #include <linux/err.h> |
| 34 | #include <linux/errno.h> |
Laurent Pinchart | 8fb9631 | 2013-12-06 10:59:10 +0100 | [diff] [blame] | 35 | #include <linux/init.h> |
| 36 | #include <linux/interrupt.h> |
| 37 | #include <linux/ioport.h> |
| 38 | #include <linux/major.h> |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/mm.h> |
| 41 | #include <linux/notifier.h> |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 42 | #include <linux/of.h> |
Laurent Pinchart | 8fb9631 | 2013-12-06 10:59:10 +0100 | [diff] [blame] | 43 | #include <linux/platform_device.h> |
| 44 | #include <linux/pm_runtime.h> |
| 45 | #include <linux/scatterlist.h> |
| 46 | #include <linux/serial.h> |
| 47 | #include <linux/serial_sci.h> |
| 48 | #include <linux/sh_dma.h> |
| 49 | #include <linux/slab.h> |
| 50 | #include <linux/string.h> |
| 51 | #include <linux/sysrq.h> |
| 52 | #include <linux/timer.h> |
| 53 | #include <linux/tty.h> |
| 54 | #include <linux/tty_flip.h> |
Paul Mundt | 85f094e | 2008-04-25 16:04:20 +0900 | [diff] [blame] | 55 | |
| 56 | #ifdef CONFIG_SUPERH |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 57 | #include <asm/sh_bios.h> |
Paul Mundt | b7a76e4 | 2006-02-01 03:06:06 -0800 | [diff] [blame] | 58 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #include "sh-sci.h" |
| 61 | |
Laurent Pinchart | 89b5c1a | 2013-12-06 10:59:52 +0100 | [diff] [blame] | 62 | /* Offsets into the sci_port->irqs array */ |
| 63 | enum { |
| 64 | SCIx_ERI_IRQ, |
| 65 | SCIx_RXI_IRQ, |
| 66 | SCIx_TXI_IRQ, |
| 67 | SCIx_BRI_IRQ, |
| 68 | SCIx_NR_IRQS, |
| 69 | |
| 70 | SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */ |
| 71 | }; |
| 72 | |
| 73 | #define SCIx_IRQ_IS_MUXED(port) \ |
| 74 | ((port)->irqs[SCIx_ERI_IRQ] == \ |
| 75 | (port)->irqs[SCIx_RXI_IRQ]) || \ |
| 76 | ((port)->irqs[SCIx_ERI_IRQ] && \ |
| 77 | ((port)->irqs[SCIx_RXI_IRQ] < 0)) |
| 78 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 79 | struct sci_port { |
| 80 | struct uart_port port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Paul Mundt | ce6738b | 2011-01-19 15:24:40 +0900 | [diff] [blame] | 82 | /* Platform configuration */ |
| 83 | struct plat_sci_port *cfg; |
Laurent Pinchart | 3ae988d | 2013-12-06 10:59:17 +0100 | [diff] [blame] | 84 | int overrun_bit; |
| 85 | unsigned int error_mask; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 86 | unsigned int sampling_rate; |
Laurent Pinchart | 3ae988d | 2013-12-06 10:59:17 +0100 | [diff] [blame] | 87 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 88 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 89 | /* Break timer */ |
| 90 | struct timer_list break_timer; |
| 91 | int break_flag; |
dmitry pervushin | 1534a3b | 2007-04-24 13:41:12 +0900 | [diff] [blame] | 92 | |
Magnus Damm | 501b825 | 2009-01-21 15:14:30 +0000 | [diff] [blame] | 93 | /* Interface clock */ |
| 94 | struct clk *iclk; |
Paul Mundt | c7ed1ab | 2010-03-10 18:35:14 +0900 | [diff] [blame] | 95 | /* Function clock */ |
| 96 | struct clk *fclk; |
Paul Mundt | edad1f2 | 2009-11-25 16:23:35 +0900 | [diff] [blame] | 97 | |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 98 | int irqs[SCIx_NR_IRQS]; |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 99 | char *irqstr[SCIx_NR_IRQS]; |
| 100 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 101 | struct dma_chan *chan_tx; |
| 102 | struct dma_chan *chan_rx; |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 103 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 104 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 105 | struct dma_async_tx_descriptor *desc_tx; |
| 106 | struct dma_async_tx_descriptor *desc_rx[2]; |
| 107 | dma_cookie_t cookie_tx; |
| 108 | dma_cookie_t cookie_rx[2]; |
| 109 | dma_cookie_t active_rx; |
| 110 | struct scatterlist sg_tx; |
| 111 | unsigned int sg_len_tx; |
| 112 | struct scatterlist sg_rx[2]; |
| 113 | size_t buf_len_rx; |
| 114 | struct sh_dmae_slave param_tx; |
| 115 | struct sh_dmae_slave param_rx; |
| 116 | struct work_struct work_tx; |
| 117 | struct work_struct work_rx; |
| 118 | struct timer_list rx_timer; |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 119 | unsigned int rx_timeout; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 120 | #endif |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 121 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 122 | struct notifier_block freq_transition; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 123 | }; |
| 124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | /* Function prototypes */ |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 126 | static void sci_start_tx(struct uart_port *port); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 127 | static void sci_stop_tx(struct uart_port *port); |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 128 | static void sci_start_rx(struct uart_port *port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 130 | #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS |
| 131 | |
| 132 | static struct sci_port sci_ports[SCI_NPORTS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | static struct uart_driver sci_uart_driver; |
| 134 | |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 135 | static inline struct sci_port * |
| 136 | to_sci_port(struct uart_port *uart) |
| 137 | { |
| 138 | return container_of(uart, struct sci_port, port); |
| 139 | } |
| 140 | |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 141 | struct plat_sci_reg { |
| 142 | u8 offset, size; |
| 143 | }; |
| 144 | |
| 145 | /* Helper for invalidating specific entries of an inherited map. */ |
| 146 | #define sci_reg_invalid { .offset = 0, .size = 0 } |
| 147 | |
| 148 | static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { |
| 149 | [SCIx_PROBE_REGTYPE] = { |
| 150 | [0 ... SCIx_NR_REGS - 1] = sci_reg_invalid, |
| 151 | }, |
| 152 | |
| 153 | /* |
| 154 | * Common SCI definitions, dependent on the port's regshift |
| 155 | * value. |
| 156 | */ |
| 157 | [SCIx_SCI_REGTYPE] = { |
| 158 | [SCSMR] = { 0x00, 8 }, |
| 159 | [SCBRR] = { 0x01, 8 }, |
| 160 | [SCSCR] = { 0x02, 8 }, |
| 161 | [SCxTDR] = { 0x03, 8 }, |
| 162 | [SCxSR] = { 0x04, 8 }, |
| 163 | [SCxRDR] = { 0x05, 8 }, |
| 164 | [SCFCR] = sci_reg_invalid, |
| 165 | [SCFDR] = sci_reg_invalid, |
| 166 | [SCTFDR] = sci_reg_invalid, |
| 167 | [SCRFDR] = sci_reg_invalid, |
| 168 | [SCSPTR] = sci_reg_invalid, |
| 169 | [SCLSR] = sci_reg_invalid, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 170 | [HSSRR] = sci_reg_invalid, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 171 | }, |
| 172 | |
| 173 | /* |
| 174 | * Common definitions for legacy IrDA ports, dependent on |
| 175 | * regshift value. |
| 176 | */ |
| 177 | [SCIx_IRDA_REGTYPE] = { |
| 178 | [SCSMR] = { 0x00, 8 }, |
| 179 | [SCBRR] = { 0x01, 8 }, |
| 180 | [SCSCR] = { 0x02, 8 }, |
| 181 | [SCxTDR] = { 0x03, 8 }, |
| 182 | [SCxSR] = { 0x04, 8 }, |
| 183 | [SCxRDR] = { 0x05, 8 }, |
| 184 | [SCFCR] = { 0x06, 8 }, |
| 185 | [SCFDR] = { 0x07, 16 }, |
| 186 | [SCTFDR] = sci_reg_invalid, |
| 187 | [SCRFDR] = sci_reg_invalid, |
| 188 | [SCSPTR] = sci_reg_invalid, |
| 189 | [SCLSR] = sci_reg_invalid, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 190 | [HSSRR] = sci_reg_invalid, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 191 | }, |
| 192 | |
| 193 | /* |
| 194 | * Common SCIFA definitions. |
| 195 | */ |
| 196 | [SCIx_SCIFA_REGTYPE] = { |
| 197 | [SCSMR] = { 0x00, 16 }, |
| 198 | [SCBRR] = { 0x04, 8 }, |
| 199 | [SCSCR] = { 0x08, 16 }, |
| 200 | [SCxTDR] = { 0x20, 8 }, |
| 201 | [SCxSR] = { 0x14, 16 }, |
| 202 | [SCxRDR] = { 0x24, 8 }, |
| 203 | [SCFCR] = { 0x18, 16 }, |
| 204 | [SCFDR] = { 0x1c, 16 }, |
| 205 | [SCTFDR] = sci_reg_invalid, |
| 206 | [SCRFDR] = sci_reg_invalid, |
| 207 | [SCSPTR] = sci_reg_invalid, |
| 208 | [SCLSR] = sci_reg_invalid, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 209 | [HSSRR] = sci_reg_invalid, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 210 | }, |
| 211 | |
| 212 | /* |
| 213 | * Common SCIFB definitions. |
| 214 | */ |
| 215 | [SCIx_SCIFB_REGTYPE] = { |
| 216 | [SCSMR] = { 0x00, 16 }, |
| 217 | [SCBRR] = { 0x04, 8 }, |
| 218 | [SCSCR] = { 0x08, 16 }, |
| 219 | [SCxTDR] = { 0x40, 8 }, |
| 220 | [SCxSR] = { 0x14, 16 }, |
| 221 | [SCxRDR] = { 0x60, 8 }, |
| 222 | [SCFCR] = { 0x18, 16 }, |
Takashi Yoshii | 8c66d6d | 2012-11-16 10:53:31 +0900 | [diff] [blame] | 223 | [SCFDR] = sci_reg_invalid, |
| 224 | [SCTFDR] = { 0x38, 16 }, |
| 225 | [SCRFDR] = { 0x3c, 16 }, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 226 | [SCSPTR] = sci_reg_invalid, |
| 227 | [SCLSR] = sci_reg_invalid, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 228 | [HSSRR] = sci_reg_invalid, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 229 | }, |
| 230 | |
| 231 | /* |
Phil Edworthy | 3af1f8a | 2011-10-03 15:16:47 +0100 | [diff] [blame] | 232 | * Common SH-2(A) SCIF definitions for ports with FIFO data |
| 233 | * count registers. |
| 234 | */ |
| 235 | [SCIx_SH2_SCIF_FIFODATA_REGTYPE] = { |
| 236 | [SCSMR] = { 0x00, 16 }, |
| 237 | [SCBRR] = { 0x04, 8 }, |
| 238 | [SCSCR] = { 0x08, 16 }, |
| 239 | [SCxTDR] = { 0x0c, 8 }, |
| 240 | [SCxSR] = { 0x10, 16 }, |
| 241 | [SCxRDR] = { 0x14, 8 }, |
| 242 | [SCFCR] = { 0x18, 16 }, |
| 243 | [SCFDR] = { 0x1c, 16 }, |
| 244 | [SCTFDR] = sci_reg_invalid, |
| 245 | [SCRFDR] = sci_reg_invalid, |
| 246 | [SCSPTR] = { 0x20, 16 }, |
| 247 | [SCLSR] = { 0x24, 16 }, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 248 | [HSSRR] = sci_reg_invalid, |
Phil Edworthy | 3af1f8a | 2011-10-03 15:16:47 +0100 | [diff] [blame] | 249 | }, |
| 250 | |
| 251 | /* |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 252 | * Common SH-3 SCIF definitions. |
| 253 | */ |
| 254 | [SCIx_SH3_SCIF_REGTYPE] = { |
| 255 | [SCSMR] = { 0x00, 8 }, |
| 256 | [SCBRR] = { 0x02, 8 }, |
| 257 | [SCSCR] = { 0x04, 8 }, |
| 258 | [SCxTDR] = { 0x06, 8 }, |
| 259 | [SCxSR] = { 0x08, 16 }, |
| 260 | [SCxRDR] = { 0x0a, 8 }, |
| 261 | [SCFCR] = { 0x0c, 8 }, |
| 262 | [SCFDR] = { 0x0e, 16 }, |
| 263 | [SCTFDR] = sci_reg_invalid, |
| 264 | [SCRFDR] = sci_reg_invalid, |
| 265 | [SCSPTR] = sci_reg_invalid, |
| 266 | [SCLSR] = sci_reg_invalid, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 267 | [HSSRR] = sci_reg_invalid, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 268 | }, |
| 269 | |
| 270 | /* |
| 271 | * Common SH-4(A) SCIF(B) definitions. |
| 272 | */ |
| 273 | [SCIx_SH4_SCIF_REGTYPE] = { |
| 274 | [SCSMR] = { 0x00, 16 }, |
| 275 | [SCBRR] = { 0x04, 8 }, |
| 276 | [SCSCR] = { 0x08, 16 }, |
| 277 | [SCxTDR] = { 0x0c, 8 }, |
| 278 | [SCxSR] = { 0x10, 16 }, |
| 279 | [SCxRDR] = { 0x14, 8 }, |
| 280 | [SCFCR] = { 0x18, 16 }, |
| 281 | [SCFDR] = { 0x1c, 16 }, |
| 282 | [SCTFDR] = sci_reg_invalid, |
| 283 | [SCRFDR] = sci_reg_invalid, |
| 284 | [SCSPTR] = { 0x20, 16 }, |
| 285 | [SCLSR] = { 0x24, 16 }, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 286 | [HSSRR] = sci_reg_invalid, |
| 287 | }, |
| 288 | |
| 289 | /* |
| 290 | * Common HSCIF definitions. |
| 291 | */ |
| 292 | [SCIx_HSCIF_REGTYPE] = { |
| 293 | [SCSMR] = { 0x00, 16 }, |
| 294 | [SCBRR] = { 0x04, 8 }, |
| 295 | [SCSCR] = { 0x08, 16 }, |
| 296 | [SCxTDR] = { 0x0c, 8 }, |
| 297 | [SCxSR] = { 0x10, 16 }, |
| 298 | [SCxRDR] = { 0x14, 8 }, |
| 299 | [SCFCR] = { 0x18, 16 }, |
| 300 | [SCFDR] = { 0x1c, 16 }, |
| 301 | [SCTFDR] = sci_reg_invalid, |
| 302 | [SCRFDR] = sci_reg_invalid, |
| 303 | [SCSPTR] = { 0x20, 16 }, |
| 304 | [SCLSR] = { 0x24, 16 }, |
| 305 | [HSSRR] = { 0x40, 16 }, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 306 | }, |
| 307 | |
| 308 | /* |
| 309 | * Common SH-4(A) SCIF(B) definitions for ports without an SCSPTR |
| 310 | * register. |
| 311 | */ |
| 312 | [SCIx_SH4_SCIF_NO_SCSPTR_REGTYPE] = { |
| 313 | [SCSMR] = { 0x00, 16 }, |
| 314 | [SCBRR] = { 0x04, 8 }, |
| 315 | [SCSCR] = { 0x08, 16 }, |
| 316 | [SCxTDR] = { 0x0c, 8 }, |
| 317 | [SCxSR] = { 0x10, 16 }, |
| 318 | [SCxRDR] = { 0x14, 8 }, |
| 319 | [SCFCR] = { 0x18, 16 }, |
| 320 | [SCFDR] = { 0x1c, 16 }, |
| 321 | [SCTFDR] = sci_reg_invalid, |
| 322 | [SCRFDR] = sci_reg_invalid, |
| 323 | [SCSPTR] = sci_reg_invalid, |
| 324 | [SCLSR] = { 0x24, 16 }, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 325 | [HSSRR] = sci_reg_invalid, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 326 | }, |
| 327 | |
| 328 | /* |
| 329 | * Common SH-4(A) SCIF(B) definitions for ports with FIFO data |
| 330 | * count registers. |
| 331 | */ |
| 332 | [SCIx_SH4_SCIF_FIFODATA_REGTYPE] = { |
| 333 | [SCSMR] = { 0x00, 16 }, |
| 334 | [SCBRR] = { 0x04, 8 }, |
| 335 | [SCSCR] = { 0x08, 16 }, |
| 336 | [SCxTDR] = { 0x0c, 8 }, |
| 337 | [SCxSR] = { 0x10, 16 }, |
| 338 | [SCxRDR] = { 0x14, 8 }, |
| 339 | [SCFCR] = { 0x18, 16 }, |
| 340 | [SCFDR] = { 0x1c, 16 }, |
| 341 | [SCTFDR] = { 0x1c, 16 }, /* aliased to SCFDR */ |
| 342 | [SCRFDR] = { 0x20, 16 }, |
| 343 | [SCSPTR] = { 0x24, 16 }, |
| 344 | [SCLSR] = { 0x28, 16 }, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 345 | [HSSRR] = sci_reg_invalid, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 346 | }, |
| 347 | |
| 348 | /* |
| 349 | * SH7705-style SCIF(B) ports, lacking both SCSPTR and SCLSR |
| 350 | * registers. |
| 351 | */ |
| 352 | [SCIx_SH7705_SCIF_REGTYPE] = { |
| 353 | [SCSMR] = { 0x00, 16 }, |
| 354 | [SCBRR] = { 0x04, 8 }, |
| 355 | [SCSCR] = { 0x08, 16 }, |
| 356 | [SCxTDR] = { 0x20, 8 }, |
| 357 | [SCxSR] = { 0x14, 16 }, |
| 358 | [SCxRDR] = { 0x24, 8 }, |
| 359 | [SCFCR] = { 0x18, 16 }, |
| 360 | [SCFDR] = { 0x1c, 16 }, |
| 361 | [SCTFDR] = sci_reg_invalid, |
| 362 | [SCRFDR] = sci_reg_invalid, |
| 363 | [SCSPTR] = sci_reg_invalid, |
| 364 | [SCLSR] = sci_reg_invalid, |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 365 | [HSSRR] = sci_reg_invalid, |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 366 | }, |
| 367 | }; |
| 368 | |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 369 | #define sci_getreg(up, offset) (sci_regmap[to_sci_port(up)->cfg->regtype] + offset) |
| 370 | |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 371 | /* |
| 372 | * The "offset" here is rather misleading, in that it refers to an enum |
| 373 | * value relative to the port mapping rather than the fixed offset |
| 374 | * itself, which needs to be manually retrieved from the platform's |
| 375 | * register map for the given port. |
| 376 | */ |
| 377 | static unsigned int sci_serial_in(struct uart_port *p, int offset) |
| 378 | { |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 379 | struct plat_sci_reg *reg = sci_getreg(p, offset); |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 380 | |
| 381 | if (reg->size == 8) |
| 382 | return ioread8(p->membase + (reg->offset << p->regshift)); |
| 383 | else if (reg->size == 16) |
| 384 | return ioread16(p->membase + (reg->offset << p->regshift)); |
| 385 | else |
| 386 | WARN(1, "Invalid register access\n"); |
| 387 | |
| 388 | return 0; |
| 389 | } |
| 390 | |
| 391 | static void sci_serial_out(struct uart_port *p, int offset, int value) |
| 392 | { |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 393 | struct plat_sci_reg *reg = sci_getreg(p, offset); |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 394 | |
| 395 | if (reg->size == 8) |
| 396 | iowrite8(value, p->membase + (reg->offset << p->regshift)); |
| 397 | else if (reg->size == 16) |
| 398 | iowrite16(value, p->membase + (reg->offset << p->regshift)); |
| 399 | else |
| 400 | WARN(1, "Invalid register access\n"); |
| 401 | } |
| 402 | |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 403 | static int sci_probe_regmap(struct plat_sci_port *cfg) |
| 404 | { |
| 405 | switch (cfg->type) { |
| 406 | case PORT_SCI: |
| 407 | cfg->regtype = SCIx_SCI_REGTYPE; |
| 408 | break; |
| 409 | case PORT_IRDA: |
| 410 | cfg->regtype = SCIx_IRDA_REGTYPE; |
| 411 | break; |
| 412 | case PORT_SCIFA: |
| 413 | cfg->regtype = SCIx_SCIFA_REGTYPE; |
| 414 | break; |
| 415 | case PORT_SCIFB: |
| 416 | cfg->regtype = SCIx_SCIFB_REGTYPE; |
| 417 | break; |
| 418 | case PORT_SCIF: |
| 419 | /* |
| 420 | * The SH-4 is a bit of a misnomer here, although that's |
| 421 | * where this particular port layout originated. This |
| 422 | * configuration (or some slight variation thereof) |
| 423 | * remains the dominant model for all SCIFs. |
| 424 | */ |
| 425 | cfg->regtype = SCIx_SH4_SCIF_REGTYPE; |
| 426 | break; |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 427 | case PORT_HSCIF: |
| 428 | cfg->regtype = SCIx_HSCIF_REGTYPE; |
| 429 | break; |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 430 | default: |
Geert Uytterhoeven | 6c13d5d | 2014-03-11 11:11:17 +0100 | [diff] [blame] | 431 | pr_err("Can't probe register map for given port\n"); |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 432 | return -EINVAL; |
| 433 | } |
| 434 | |
| 435 | return 0; |
| 436 | } |
| 437 | |
Paul Mundt | 23241d4 | 2011-06-28 13:55:31 +0900 | [diff] [blame] | 438 | static void sci_port_enable(struct sci_port *sci_port) |
| 439 | { |
| 440 | if (!sci_port->port.dev) |
| 441 | return; |
| 442 | |
| 443 | pm_runtime_get_sync(sci_port->port.dev); |
| 444 | |
Laurent Pinchart | b016b64 | 2013-11-28 18:11:46 +0100 | [diff] [blame] | 445 | clk_prepare_enable(sci_port->iclk); |
Paul Mundt | 23241d4 | 2011-06-28 13:55:31 +0900 | [diff] [blame] | 446 | sci_port->port.uartclk = clk_get_rate(sci_port->iclk); |
Laurent Pinchart | b016b64 | 2013-11-28 18:11:46 +0100 | [diff] [blame] | 447 | clk_prepare_enable(sci_port->fclk); |
Paul Mundt | 23241d4 | 2011-06-28 13:55:31 +0900 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | static void sci_port_disable(struct sci_port *sci_port) |
| 451 | { |
| 452 | if (!sci_port->port.dev) |
| 453 | return; |
| 454 | |
Laurent Pinchart | caec703 | 2013-11-28 18:11:45 +0100 | [diff] [blame] | 455 | /* Cancel the break timer to ensure that the timer handler will not try |
| 456 | * to access the hardware with clocks and power disabled. Reset the |
| 457 | * break flag to make the break debouncing state machine ready for the |
| 458 | * next break. |
| 459 | */ |
| 460 | del_timer_sync(&sci_port->break_timer); |
| 461 | sci_port->break_flag = 0; |
| 462 | |
Laurent Pinchart | b016b64 | 2013-11-28 18:11:46 +0100 | [diff] [blame] | 463 | clk_disable_unprepare(sci_port->fclk); |
| 464 | clk_disable_unprepare(sci_port->iclk); |
Paul Mundt | 23241d4 | 2011-06-28 13:55:31 +0900 | [diff] [blame] | 465 | |
| 466 | pm_runtime_put_sync(sci_port->port.dev); |
| 467 | } |
| 468 | |
Paul Mundt | 07d2a1a | 2008-12-11 19:06:43 +0900 | [diff] [blame] | 469 | #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE) |
Paul Mundt | 1f6fd5c | 2008-12-17 14:53:24 +0900 | [diff] [blame] | 470 | |
| 471 | #ifdef CONFIG_CONSOLE_POLL |
Paul Mundt | 07d2a1a | 2008-12-11 19:06:43 +0900 | [diff] [blame] | 472 | static int sci_poll_get_char(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | unsigned short status; |
| 475 | int c; |
| 476 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 477 | do { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 478 | status = serial_port_in(port, SCxSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | if (status & SCxSR_ERRORS(port)) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 480 | serial_port_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | continue; |
| 482 | } |
Jason Wessel | 3f255eb | 2010-05-20 21:04:23 -0500 | [diff] [blame] | 483 | break; |
| 484 | } while (1); |
| 485 | |
| 486 | if (!(status & SCxSR_RDxF(port))) |
| 487 | return NO_POLL_CHAR; |
Paul Mundt | 07d2a1a | 2008-12-11 19:06:43 +0900 | [diff] [blame] | 488 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 489 | c = serial_port_in(port, SCxRDR); |
Paul Mundt | 07d2a1a | 2008-12-11 19:06:43 +0900 | [diff] [blame] | 490 | |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 491 | /* Dummy read */ |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 492 | serial_port_in(port, SCxSR); |
| 493 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | return c; |
| 496 | } |
Paul Mundt | 1f6fd5c | 2008-12-17 14:53:24 +0900 | [diff] [blame] | 497 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
Paul Mundt | 07d2a1a | 2008-12-11 19:06:43 +0900 | [diff] [blame] | 499 | static void sci_poll_put_char(struct uart_port *port, unsigned char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | unsigned short status; |
| 502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | do { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 504 | status = serial_port_in(port, SCxSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } while (!(status & SCxSR_TDxE(port))); |
| 506 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 507 | serial_port_out(port, SCxTDR, c); |
| 508 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
Paul Mundt | 07d2a1a | 2008-12-11 19:06:43 +0900 | [diff] [blame] | 510 | #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 512 | static void sci_init_pins(struct uart_port *port, unsigned int cflag) |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 513 | { |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 514 | struct sci_port *s = to_sci_port(port); |
| 515 | struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR; |
Markus Brunner | 3ea6bc3 | 2007-08-20 08:59:33 +0900 | [diff] [blame] | 516 | |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 517 | /* |
| 518 | * Use port-specific handler if provided. |
| 519 | */ |
| 520 | if (s->cfg->ops && s->cfg->ops->init_pins) { |
| 521 | s->cfg->ops->init_pins(port, cflag); |
| 522 | return; |
Markus Brunner | 3ea6bc3 | 2007-08-20 08:59:33 +0900 | [diff] [blame] | 523 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 525 | /* |
| 526 | * For the generic path SCSPTR is necessary. Bail out if that's |
| 527 | * unavailable, too. |
| 528 | */ |
| 529 | if (!reg->size) |
| 530 | return; |
Paul Mundt | b7a76e4 | 2006-02-01 03:06:06 -0800 | [diff] [blame] | 531 | |
Paul Mundt | faf02f8 | 2011-12-02 17:44:50 +0900 | [diff] [blame] | 532 | if ((s->cfg->capabilities & SCIx_HAVE_RTSCTS) && |
| 533 | ((!(cflag & CRTSCTS)))) { |
| 534 | unsigned short status; |
| 535 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 536 | status = serial_port_in(port, SCSPTR); |
Paul Mundt | faf02f8 | 2011-12-02 17:44:50 +0900 | [diff] [blame] | 537 | status &= ~SCSPTR_CTSIO; |
| 538 | status |= SCSPTR_RTSIO; |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 539 | serial_port_out(port, SCSPTR, status); /* Set RTS = 1 */ |
Paul Mundt | faf02f8 | 2011-12-02 17:44:50 +0900 | [diff] [blame] | 540 | } |
Paul Mundt | d570164 | 2008-12-16 20:07:27 +0900 | [diff] [blame] | 541 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 543 | static int sci_txfill(struct uart_port *port) |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 544 | { |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 545 | struct plat_sci_reg *reg; |
| 546 | |
| 547 | reg = sci_getreg(port, SCTFDR); |
| 548 | if (reg->size) |
Takashi Yoshii | 63f7ad1 | 2012-11-16 10:53:11 +0900 | [diff] [blame] | 549 | return serial_port_in(port, SCTFDR) & ((port->fifosize << 1) - 1); |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 550 | |
| 551 | reg = sci_getreg(port, SCFDR); |
| 552 | if (reg->size) |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 553 | return serial_port_in(port, SCFDR) >> 8; |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 554 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 555 | return !(serial_port_in(port, SCxSR) & SCI_TDRE); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 556 | } |
| 557 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 558 | static int sci_txroom(struct uart_port *port) |
| 559 | { |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 560 | return port->fifosize - sci_txfill(port); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 561 | } |
| 562 | |
| 563 | static int sci_rxfill(struct uart_port *port) |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 564 | { |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 565 | struct plat_sci_reg *reg; |
| 566 | |
| 567 | reg = sci_getreg(port, SCRFDR); |
| 568 | if (reg->size) |
Takashi Yoshii | 63f7ad1 | 2012-11-16 10:53:11 +0900 | [diff] [blame] | 569 | return serial_port_in(port, SCRFDR) & ((port->fifosize << 1) - 1); |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 570 | |
| 571 | reg = sci_getreg(port, SCFDR); |
| 572 | if (reg->size) |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 573 | return serial_port_in(port, SCFDR) & ((port->fifosize << 1) - 1); |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 574 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 575 | return (serial_port_in(port, SCxSR) & SCxSR_RDxF(port)) != 0; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 576 | } |
| 577 | |
Paul Mundt | 514820e | 2011-06-08 18:51:32 +0900 | [diff] [blame] | 578 | /* |
| 579 | * SCI helper for checking the state of the muxed port/RXD pins. |
| 580 | */ |
| 581 | static inline int sci_rxd_in(struct uart_port *port) |
| 582 | { |
| 583 | struct sci_port *s = to_sci_port(port); |
| 584 | |
| 585 | if (s->cfg->port_reg <= 0) |
| 586 | return 1; |
| 587 | |
Paul Mundt | 0dd4d5c | 2012-10-15 14:08:48 +0900 | [diff] [blame] | 588 | /* Cast for ARM damage */ |
Laurent Pinchart | e2afca6 | 2013-12-11 13:40:31 +0100 | [diff] [blame] | 589 | return !!__raw_readb((void __iomem *)(uintptr_t)s->cfg->port_reg); |
Paul Mundt | 514820e | 2011-06-08 18:51:32 +0900 | [diff] [blame] | 590 | } |
| 591 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | /* ********************************************************************** * |
| 593 | * the interrupt related routines * |
| 594 | * ********************************************************************** */ |
| 595 | |
| 596 | static void sci_transmit_chars(struct uart_port *port) |
| 597 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 598 | struct circ_buf *xmit = &port->state->xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | unsigned int stopped = uart_tx_stopped(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | unsigned short status; |
| 601 | unsigned short ctrl; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 602 | int count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 604 | status = serial_port_in(port, SCxSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | if (!(status & SCxSR_TDxE(port))) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 606 | ctrl = serial_port_in(port, SCSCR); |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 607 | if (uart_circ_empty(xmit)) |
Paul Mundt | 8e69861 | 2009-06-24 19:44:32 +0900 | [diff] [blame] | 608 | ctrl &= ~SCSCR_TIE; |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 609 | else |
Paul Mundt | 8e69861 | 2009-06-24 19:44:32 +0900 | [diff] [blame] | 610 | ctrl |= SCSCR_TIE; |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 611 | serial_port_out(port, SCSCR, ctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | return; |
| 613 | } |
| 614 | |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 615 | count = sci_txroom(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
| 617 | do { |
| 618 | unsigned char c; |
| 619 | |
| 620 | if (port->x_char) { |
| 621 | c = port->x_char; |
| 622 | port->x_char = 0; |
| 623 | } else if (!uart_circ_empty(xmit) && !stopped) { |
| 624 | c = xmit->buf[xmit->tail]; |
| 625 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 626 | } else { |
| 627 | break; |
| 628 | } |
| 629 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 630 | serial_port_out(port, SCxTDR, c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | port->icount.tx++; |
| 633 | } while (--count > 0); |
| 634 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 635 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
| 637 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 638 | uart_write_wakeup(port); |
| 639 | if (uart_circ_empty(xmit)) { |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 640 | sci_stop_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | } else { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 642 | ctrl = serial_port_in(port, SCSCR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Yoshihiro Shimoda | 1a22f08 | 2008-11-11 12:19:05 +0900 | [diff] [blame] | 644 | if (port->type != PORT_SCI) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 645 | serial_port_in(port, SCxSR); /* Dummy read */ |
| 646 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Paul Mundt | 8e69861 | 2009-06-24 19:44:32 +0900 | [diff] [blame] | 649 | ctrl |= SCSCR_TIE; |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 650 | serial_port_out(port, SCSCR, ctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
| 652 | } |
| 653 | |
| 654 | /* On SH3, SCIF may read end-of-break as a space->mark char */ |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 655 | #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
Paul Mundt | 94c8b6d | 2011-01-20 23:26:18 +0900 | [diff] [blame] | 657 | static void sci_receive_chars(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | { |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 659 | struct sci_port *sci_port = to_sci_port(port); |
Jiri Slaby | 227434f | 2013-01-03 15:53:01 +0100 | [diff] [blame] | 660 | struct tty_port *tport = &port->state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | int i, count, copied = 0; |
| 662 | unsigned short status; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 663 | unsigned char flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 665 | status = serial_port_in(port, SCxSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | if (!(status & SCxSR_RDxF(port))) |
| 667 | return; |
| 668 | |
| 669 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | /* Don't copy more bytes than there is room for in the buffer */ |
Jiri Slaby | 227434f | 2013-01-03 15:53:01 +0100 | [diff] [blame] | 671 | count = tty_buffer_request_room(tport, sci_rxfill(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | /* If for any reason we can't copy more data, we're done! */ |
| 674 | if (count == 0) |
| 675 | break; |
| 676 | |
| 677 | if (port->type == PORT_SCI) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 678 | char c = serial_port_in(port, SCxRDR); |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 679 | if (uart_handle_sysrq_char(port, c) || |
| 680 | sci_port->break_flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | count = 0; |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 682 | else |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 683 | tty_insert_flip_char(tport, c, TTY_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | } else { |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 685 | for (i = 0; i < count; i++) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 686 | char c = serial_port_in(port, SCxRDR); |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 687 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 688 | status = serial_port_in(port, SCxSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | #if defined(CONFIG_CPU_SH3) |
| 690 | /* Skip "chars" during break */ |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 691 | if (sci_port->break_flag) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | if ((c == 0) && |
| 693 | (status & SCxSR_FER(port))) { |
| 694 | count--; i--; |
| 695 | continue; |
| 696 | } |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | /* Nonzero => end-of-break */ |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 699 | dev_dbg(port->dev, "debounce<%02x>\n", c); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 700 | sci_port->break_flag = 0; |
| 701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | if (STEPFN(c)) { |
| 703 | count--; i--; |
| 704 | continue; |
| 705 | } |
| 706 | } |
| 707 | #endif /* CONFIG_CPU_SH3 */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 708 | if (uart_handle_sysrq_char(port, c)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | count--; i--; |
| 710 | continue; |
| 711 | } |
| 712 | |
| 713 | /* Store data and status */ |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 714 | if (status & SCxSR_FER(port)) { |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 715 | flag = TTY_FRAME; |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 716 | port->icount.frame++; |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 717 | dev_notice(port->dev, "frame error\n"); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 718 | } else if (status & SCxSR_PER(port)) { |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 719 | flag = TTY_PARITY; |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 720 | port->icount.parity++; |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 721 | dev_notice(port->dev, "parity error\n"); |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 722 | } else |
| 723 | flag = TTY_NORMAL; |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 724 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 725 | tty_insert_flip_char(tport, c, flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | } |
| 727 | } |
| 728 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 729 | serial_port_in(port, SCxSR); /* dummy read */ |
| 730 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | copied += count; |
| 733 | port->icount.rx += count; |
| 734 | } |
| 735 | |
| 736 | if (copied) { |
| 737 | /* Tell the rest of the system the news. New characters! */ |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 738 | tty_flip_buffer_push(tport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | } else { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 740 | serial_port_in(port, SCxSR); /* dummy read */ |
| 741 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | } |
| 744 | |
| 745 | #define SCI_BREAK_JIFFIES (HZ/20) |
Paul Mundt | 94c8b6d | 2011-01-20 23:26:18 +0900 | [diff] [blame] | 746 | |
| 747 | /* |
| 748 | * The sci generates interrupts during the break, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | * 1 per millisecond or so during the break period, for 9600 baud. |
| 750 | * So dont bother disabling interrupts. |
| 751 | * But dont want more than 1 break event. |
| 752 | * Use a kernel timer to periodically poll the rx line until |
| 753 | * the break is finished. |
| 754 | */ |
Paul Mundt | 94c8b6d | 2011-01-20 23:26:18 +0900 | [diff] [blame] | 755 | static inline void sci_schedule_break_timer(struct sci_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | { |
Paul Mundt | bc9b3f5 | 2011-01-20 23:30:19 +0900 | [diff] [blame] | 757 | mod_timer(&port->break_timer, jiffies + SCI_BREAK_JIFFIES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | } |
Paul Mundt | 94c8b6d | 2011-01-20 23:26:18 +0900 | [diff] [blame] | 759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | /* Ensure that two consecutive samples find the break over. */ |
| 761 | static void sci_break_timer(unsigned long data) |
| 762 | { |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 763 | struct sci_port *port = (struct sci_port *)data; |
| 764 | |
| 765 | if (sci_rxd_in(&port->port) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | port->break_flag = 1; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 767 | sci_schedule_break_timer(port); |
| 768 | } else if (port->break_flag == 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | /* break is over. */ |
| 770 | port->break_flag = 2; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 771 | sci_schedule_break_timer(port); |
| 772 | } else |
| 773 | port->break_flag = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
| 775 | |
Paul Mundt | 94c8b6d | 2011-01-20 23:26:18 +0900 | [diff] [blame] | 776 | static int sci_handle_errors(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | { |
| 778 | int copied = 0; |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 779 | unsigned short status = serial_port_in(port, SCxSR); |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 780 | struct tty_port *tport = &port->state->port; |
Paul Mundt | debf950 | 2011-06-08 18:19:37 +0900 | [diff] [blame] | 781 | struct sci_port *s = to_sci_port(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Laurent Pinchart | 3ae988d | 2013-12-06 10:59:17 +0100 | [diff] [blame] | 783 | /* Handle overruns */ |
| 784 | if (status & (1 << s->overrun_bit)) { |
| 785 | port->icount.overrun++; |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 786 | |
Laurent Pinchart | 3ae988d | 2013-12-06 10:59:17 +0100 | [diff] [blame] | 787 | /* overrun error */ |
| 788 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN)) |
| 789 | copied++; |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 790 | |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 791 | dev_notice(port->dev, "overrun error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
| 793 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 794 | if (status & SCxSR_FER(port)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | if (sci_rxd_in(port) == 0) { |
| 796 | /* Notify of BREAK */ |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 797 | struct sci_port *sci_port = to_sci_port(port); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 798 | |
| 799 | if (!sci_port->break_flag) { |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 800 | port->icount.brk++; |
| 801 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 802 | sci_port->break_flag = 1; |
| 803 | sci_schedule_break_timer(sci_port); |
| 804 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | /* Do sysrq handling. */ |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 806 | if (uart_handle_break(port)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | return 0; |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 808 | |
| 809 | dev_dbg(port->dev, "BREAK detected\n"); |
| 810 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 811 | if (tty_insert_flip_char(tport, 0, TTY_BREAK)) |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 812 | copied++; |
| 813 | } |
| 814 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 815 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | /* frame error */ |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 817 | port->icount.frame++; |
| 818 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 819 | if (tty_insert_flip_char(tport, 0, TTY_FRAME)) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 820 | copied++; |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 821 | |
| 822 | dev_notice(port->dev, "frame error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } |
| 824 | } |
| 825 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 826 | if (status & SCxSR_PER(port)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | /* parity error */ |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 828 | port->icount.parity++; |
| 829 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 830 | if (tty_insert_flip_char(tport, 0, TTY_PARITY)) |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 831 | copied++; |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 832 | |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 833 | dev_notice(port->dev, "parity error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } |
| 835 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 836 | if (copied) |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 837 | tty_flip_buffer_push(tport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
| 839 | return copied; |
| 840 | } |
| 841 | |
Paul Mundt | 94c8b6d | 2011-01-20 23:26:18 +0900 | [diff] [blame] | 842 | static int sci_handle_fifo_overrun(struct uart_port *port) |
Paul Mundt | d830fa4 | 2008-12-16 19:29:38 +0900 | [diff] [blame] | 843 | { |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 844 | struct tty_port *tport = &port->state->port; |
Paul Mundt | debf950 | 2011-06-08 18:19:37 +0900 | [diff] [blame] | 845 | struct sci_port *s = to_sci_port(port); |
Paul Mundt | 4b8c59a | 2011-06-14 17:53:34 +0900 | [diff] [blame] | 846 | struct plat_sci_reg *reg; |
Paul Mundt | d830fa4 | 2008-12-16 19:29:38 +0900 | [diff] [blame] | 847 | int copied = 0; |
| 848 | |
Paul Mundt | 4b8c59a | 2011-06-14 17:53:34 +0900 | [diff] [blame] | 849 | reg = sci_getreg(port, SCLSR); |
| 850 | if (!reg->size) |
Paul Mundt | d830fa4 | 2008-12-16 19:29:38 +0900 | [diff] [blame] | 851 | return 0; |
| 852 | |
Laurent Pinchart | 3ae988d | 2013-12-06 10:59:17 +0100 | [diff] [blame] | 853 | if ((serial_port_in(port, SCLSR) & (1 << s->overrun_bit))) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 854 | serial_port_out(port, SCLSR, 0); |
Paul Mundt | d830fa4 | 2008-12-16 19:29:38 +0900 | [diff] [blame] | 855 | |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 856 | port->icount.overrun++; |
| 857 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 858 | tty_insert_flip_char(tport, 0, TTY_OVERRUN); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 859 | tty_flip_buffer_push(tport); |
Paul Mundt | d830fa4 | 2008-12-16 19:29:38 +0900 | [diff] [blame] | 860 | |
| 861 | dev_notice(port->dev, "overrun error\n"); |
| 862 | copied++; |
| 863 | } |
| 864 | |
| 865 | return copied; |
| 866 | } |
| 867 | |
Paul Mundt | 94c8b6d | 2011-01-20 23:26:18 +0900 | [diff] [blame] | 868 | static int sci_handle_breaks(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | { |
| 870 | int copied = 0; |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 871 | unsigned short status = serial_port_in(port, SCxSR); |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 872 | struct tty_port *tport = &port->state->port; |
Magnus Damm | a5660ad | 2009-01-21 15:14:38 +0000 | [diff] [blame] | 873 | struct sci_port *s = to_sci_port(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
Paul Mundt | 0b3d4ef | 2007-03-14 13:22:37 +0900 | [diff] [blame] | 875 | if (uart_handle_break(port)) |
| 876 | return 0; |
| 877 | |
Paul Mundt | b7a76e4 | 2006-02-01 03:06:06 -0800 | [diff] [blame] | 878 | if (!s->break_flag && status & SCxSR_BRK(port)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | #if defined(CONFIG_CPU_SH3) |
| 880 | /* Debounce break */ |
| 881 | s->break_flag = 1; |
| 882 | #endif |
Paul Mundt | d97fbbe | 2011-11-24 19:15:06 +0900 | [diff] [blame] | 883 | |
| 884 | port->icount.brk++; |
| 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | /* Notify of BREAK */ |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 887 | if (tty_insert_flip_char(tport, 0, TTY_BREAK)) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 888 | copied++; |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 889 | |
| 890 | dev_dbg(port->dev, "BREAK detected\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
| 892 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 893 | if (copied) |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 894 | tty_flip_buffer_push(tport); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 895 | |
Paul Mundt | d830fa4 | 2008-12-16 19:29:38 +0900 | [diff] [blame] | 896 | copied += sci_handle_fifo_overrun(port); |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | return copied; |
| 899 | } |
| 900 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 901 | static irqreturn_t sci_rx_interrupt(int irq, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | { |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 903 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
| 904 | struct uart_port *port = ptr; |
| 905 | struct sci_port *s = to_sci_port(port); |
| 906 | |
| 907 | if (s->chan_rx) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 908 | u16 scr = serial_port_in(port, SCSCR); |
| 909 | u16 ssr = serial_port_in(port, SCxSR); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 910 | |
| 911 | /* Disable future Rx interrupts */ |
Guennadi Liakhovetski | d1d4b10 | 2010-05-23 16:39:09 +0000 | [diff] [blame] | 912 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 913 | disable_irq_nosync(irq); |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 914 | scr |= SCSCR_RDRQE; |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 915 | } else { |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 916 | scr &= ~SCSCR_RIE; |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 917 | } |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 918 | serial_port_out(port, SCSCR, scr); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 919 | /* Clear current interrupt */ |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 920 | serial_port_out(port, SCxSR, ssr & ~(1 | SCxSR_RDxF(port))); |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 921 | dev_dbg(port->dev, "Rx IRQ %lu: setup t-out in %u jiffies\n", |
| 922 | jiffies, s->rx_timeout); |
| 923 | mod_timer(&s->rx_timer, jiffies + s->rx_timeout); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 924 | |
| 925 | return IRQ_HANDLED; |
| 926 | } |
| 927 | #endif |
| 928 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | /* I think sci_receive_chars has to be called irrespective |
| 930 | * of whether the I_IXOFF is set, otherwise, how is the interrupt |
| 931 | * to be disabled? |
| 932 | */ |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 933 | sci_receive_chars(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
| 935 | return IRQ_HANDLED; |
| 936 | } |
| 937 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 938 | static irqreturn_t sci_tx_interrupt(int irq, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | { |
| 940 | struct uart_port *port = ptr; |
Stuart Menefy | fd78a76 | 2009-07-29 23:01:24 +0900 | [diff] [blame] | 941 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Stuart Menefy | fd78a76 | 2009-07-29 23:01:24 +0900 | [diff] [blame] | 943 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | sci_transmit_chars(port); |
Stuart Menefy | fd78a76 | 2009-07-29 23:01:24 +0900 | [diff] [blame] | 945 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
| 947 | return IRQ_HANDLED; |
| 948 | } |
| 949 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 950 | static irqreturn_t sci_er_interrupt(int irq, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | { |
| 952 | struct uart_port *port = ptr; |
| 953 | |
| 954 | /* Handle errors */ |
| 955 | if (port->type == PORT_SCI) { |
| 956 | if (sci_handle_errors(port)) { |
| 957 | /* discard character in rx buffer */ |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 958 | serial_port_in(port, SCxSR); |
| 959 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |
| 961 | } else { |
Paul Mundt | d830fa4 | 2008-12-16 19:29:38 +0900 | [diff] [blame] | 962 | sci_handle_fifo_overrun(port); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 963 | sci_rx_interrupt(irq, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | } |
| 965 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 966 | serial_port_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
| 968 | /* Kick the transmission */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 969 | sci_tx_interrupt(irq, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
| 971 | return IRQ_HANDLED; |
| 972 | } |
| 973 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 974 | static irqreturn_t sci_br_interrupt(int irq, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | { |
| 976 | struct uart_port *port = ptr; |
| 977 | |
| 978 | /* Handle BREAKs */ |
| 979 | sci_handle_breaks(port); |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 980 | serial_port_out(port, SCxSR, SCxSR_BREAK_CLEAR(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
| 982 | return IRQ_HANDLED; |
| 983 | } |
| 984 | |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 985 | static inline unsigned long port_rx_irq_mask(struct uart_port *port) |
| 986 | { |
| 987 | /* |
| 988 | * Not all ports (such as SCIFA) will support REIE. Rather than |
| 989 | * special-casing the port type, we check the port initialization |
| 990 | * IRQ enable mask to see whether the IRQ is desired at all. If |
| 991 | * it's unset, it's logically inferred that there's no point in |
| 992 | * testing for it. |
| 993 | */ |
Paul Mundt | ce6738b | 2011-01-19 15:24:40 +0900 | [diff] [blame] | 994 | return SCSCR_RIE | (to_sci_port(port)->cfg->scscr & SCSCR_REIE); |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 995 | } |
| 996 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 997 | static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | { |
Magnus Damm | 44e18e9 | 2009-07-03 08:39:34 +0000 | [diff] [blame] | 999 | unsigned short ssr_status, scr_status, err_enabled; |
Michael Trimarchi | a8884e3 | 2008-10-31 16:10:23 +0900 | [diff] [blame] | 1000 | struct uart_port *port = ptr; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1001 | struct sci_port *s = to_sci_port(port); |
Michael Trimarchi | a8884e3 | 2008-10-31 16:10:23 +0900 | [diff] [blame] | 1002 | irqreturn_t ret = IRQ_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1004 | ssr_status = serial_port_in(port, SCxSR); |
| 1005 | scr_status = serial_port_in(port, SCSCR); |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1006 | err_enabled = scr_status & port_rx_irq_mask(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
| 1008 | /* Tx Interrupt */ |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1009 | if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCSCR_TIE) && |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1010 | !s->chan_tx) |
Michael Trimarchi | a8884e3 | 2008-10-31 16:10:23 +0900 | [diff] [blame] | 1011 | ret = sci_tx_interrupt(irq, ptr); |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1012 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1013 | /* |
| 1014 | * Rx Interrupt: if we're using DMA, the DMA controller clears RDF / |
| 1015 | * DR flags |
| 1016 | */ |
| 1017 | if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) && |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1018 | (scr_status & SCSCR_RIE)) |
Michael Trimarchi | a8884e3 | 2008-10-31 16:10:23 +0900 | [diff] [blame] | 1019 | ret = sci_rx_interrupt(irq, ptr); |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | /* Error Interrupt */ |
SUGIOKA Toshinobu | dd4da3a | 2009-07-07 05:32:07 +0000 | [diff] [blame] | 1022 | if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled) |
Michael Trimarchi | a8884e3 | 2008-10-31 16:10:23 +0900 | [diff] [blame] | 1023 | ret = sci_er_interrupt(irq, ptr); |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1024 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | /* Break Interrupt */ |
SUGIOKA Toshinobu | dd4da3a | 2009-07-07 05:32:07 +0000 | [diff] [blame] | 1026 | if ((ssr_status & SCxSR_BRK(port)) && err_enabled) |
Michael Trimarchi | a8884e3 | 2008-10-31 16:10:23 +0900 | [diff] [blame] | 1027 | ret = sci_br_interrupt(irq, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
Michael Trimarchi | a8884e3 | 2008-10-31 16:10:23 +0900 | [diff] [blame] | 1029 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | } |
| 1031 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1033 | * Here we define a transition notifier so that we can update all of our |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | * ports' baud rate when the peripheral clock changes. |
| 1035 | */ |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 1036 | static int sci_notifier(struct notifier_block *self, |
| 1037 | unsigned long phase, void *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | { |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 1039 | struct sci_port *sci_port; |
| 1040 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 1042 | sci_port = container_of(self, struct sci_port, freq_transition); |
| 1043 | |
Viresh Kumar | 0b443ea | 2014-03-19 11:24:58 +0530 | [diff] [blame] | 1044 | if (phase == CPUFREQ_POSTCHANGE) { |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 1045 | struct uart_port *port = &sci_port->port; |
Paul Mundt | 073e84c | 2011-01-19 17:30:53 +0900 | [diff] [blame] | 1046 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 1047 | spin_lock_irqsave(&port->lock, flags); |
| 1048 | port->uartclk = clk_get_rate(sci_port->iclk); |
| 1049 | spin_unlock_irqrestore(&port->lock, flags); |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 1050 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | return NOTIFY_OK; |
| 1053 | } |
Magnus Damm | 501b825 | 2009-01-21 15:14:30 +0000 | [diff] [blame] | 1054 | |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1055 | static struct sci_irq_desc { |
| 1056 | const char *desc; |
| 1057 | irq_handler_t handler; |
| 1058 | } sci_irq_desc[] = { |
| 1059 | /* |
| 1060 | * Split out handlers, the default case. |
| 1061 | */ |
| 1062 | [SCIx_ERI_IRQ] = { |
| 1063 | .desc = "rx err", |
| 1064 | .handler = sci_er_interrupt, |
| 1065 | }, |
| 1066 | |
| 1067 | [SCIx_RXI_IRQ] = { |
| 1068 | .desc = "rx full", |
| 1069 | .handler = sci_rx_interrupt, |
| 1070 | }, |
| 1071 | |
| 1072 | [SCIx_TXI_IRQ] = { |
| 1073 | .desc = "tx empty", |
| 1074 | .handler = sci_tx_interrupt, |
| 1075 | }, |
| 1076 | |
| 1077 | [SCIx_BRI_IRQ] = { |
| 1078 | .desc = "break", |
| 1079 | .handler = sci_br_interrupt, |
| 1080 | }, |
| 1081 | |
| 1082 | /* |
| 1083 | * Special muxed handler. |
| 1084 | */ |
| 1085 | [SCIx_MUX_IRQ] = { |
| 1086 | .desc = "mux", |
| 1087 | .handler = sci_mpxed_interrupt, |
| 1088 | }, |
| 1089 | }; |
| 1090 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | static int sci_request_irq(struct sci_port *port) |
| 1092 | { |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1093 | struct uart_port *up = &port->port; |
| 1094 | int i, j, ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1096 | for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) { |
| 1097 | struct sci_irq_desc *desc; |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 1098 | int irq; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 1099 | |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1100 | if (SCIx_IRQ_IS_MUXED(port)) { |
| 1101 | i = SCIx_MUX_IRQ; |
| 1102 | irq = up->irq; |
Paul Mundt | 0e8963d | 2012-05-18 18:21:06 +0900 | [diff] [blame] | 1103 | } else { |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 1104 | irq = port->irqs[i]; |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1105 | |
Paul Mundt | 0e8963d | 2012-05-18 18:21:06 +0900 | [diff] [blame] | 1106 | /* |
| 1107 | * Certain port types won't support all of the |
| 1108 | * available interrupt sources. |
| 1109 | */ |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 1110 | if (unlikely(irq < 0)) |
Paul Mundt | 0e8963d | 2012-05-18 18:21:06 +0900 | [diff] [blame] | 1111 | continue; |
| 1112 | } |
| 1113 | |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1114 | desc = sci_irq_desc + i; |
| 1115 | port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s", |
| 1116 | dev_name(up->dev), desc->desc); |
| 1117 | if (!port->irqstr[j]) { |
| 1118 | dev_err(up->dev, "Failed to allocate %s IRQ string\n", |
| 1119 | desc->desc); |
| 1120 | goto out_nomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | } |
Paul Mundt | 762c69e | 2008-12-16 18:55:26 +0900 | [diff] [blame] | 1122 | |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1123 | ret = request_irq(irq, desc->handler, up->irqflags, |
| 1124 | port->irqstr[j], port); |
| 1125 | if (unlikely(ret)) { |
| 1126 | dev_err(up->dev, "Can't allocate %s IRQ\n", desc->desc); |
| 1127 | goto out_noirq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | return 0; |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1132 | |
| 1133 | out_noirq: |
| 1134 | while (--i >= 0) |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 1135 | free_irq(port->irqs[i], port); |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1136 | |
| 1137 | out_nomem: |
| 1138 | while (--j >= 0) |
| 1139 | kfree(port->irqstr[j]); |
| 1140 | |
| 1141 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | } |
| 1143 | |
| 1144 | static void sci_free_irq(struct sci_port *port) |
| 1145 | { |
| 1146 | int i; |
| 1147 | |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1148 | /* |
| 1149 | * Intentionally in reverse order so we iterate over the muxed |
| 1150 | * IRQ first. |
| 1151 | */ |
| 1152 | for (i = 0; i < SCIx_NR_IRQS; i++) { |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 1153 | int irq = port->irqs[i]; |
Paul Mundt | 0e8963d | 2012-05-18 18:21:06 +0900 | [diff] [blame] | 1154 | |
| 1155 | /* |
| 1156 | * Certain port types won't support all of the available |
| 1157 | * interrupt sources. |
| 1158 | */ |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 1159 | if (unlikely(irq < 0)) |
Paul Mundt | 0e8963d | 2012-05-18 18:21:06 +0900 | [diff] [blame] | 1160 | continue; |
| 1161 | |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 1162 | free_irq(port->irqs[i], port); |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1163 | kfree(port->irqstr[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | |
Paul Mundt | 9174fc8 | 2011-06-28 15:25:36 +0900 | [diff] [blame] | 1165 | if (SCIx_IRQ_IS_MUXED(port)) { |
| 1166 | /* If there's only one IRQ, we're done. */ |
| 1167 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | } |
| 1169 | } |
| 1170 | } |
| 1171 | |
| 1172 | static unsigned int sci_tx_empty(struct uart_port *port) |
| 1173 | { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1174 | unsigned short status = serial_port_in(port, SCxSR); |
Paul Mundt | 72b294c | 2011-06-14 17:38:19 +0900 | [diff] [blame] | 1175 | unsigned short in_tx_fifo = sci_txfill(port); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1176 | |
| 1177 | return (status & SCxSR_TEND(port)) && !in_tx_fifo ? TIOCSER_TEMT : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | } |
| 1179 | |
Paul Mundt | cdf7c42 | 2011-11-24 20:18:32 +0900 | [diff] [blame] | 1180 | /* |
| 1181 | * Modem control is a bit of a mixed bag for SCI(F) ports. Generally |
| 1182 | * CTS/RTS is supported in hardware by at least one port and controlled |
| 1183 | * via SCSPTR (SCxPCR for SCIFA/B parts), or external pins (presently |
| 1184 | * handled via the ->init_pins() op, which is a bit of a one-way street, |
| 1185 | * lacking any ability to defer pin control -- this will later be |
| 1186 | * converted over to the GPIO framework). |
Paul Mundt | dc7e3ef | 2011-11-24 20:20:53 +0900 | [diff] [blame] | 1187 | * |
| 1188 | * Other modes (such as loopback) are supported generically on certain |
| 1189 | * port types, but not others. For these it's sufficient to test for the |
| 1190 | * existence of the support register and simply ignore the port type. |
Paul Mundt | cdf7c42 | 2011-11-24 20:18:32 +0900 | [diff] [blame] | 1191 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 1193 | { |
Paul Mundt | dc7e3ef | 2011-11-24 20:20:53 +0900 | [diff] [blame] | 1194 | if (mctrl & TIOCM_LOOP) { |
| 1195 | struct plat_sci_reg *reg; |
| 1196 | |
| 1197 | /* |
| 1198 | * Standard loopback mode for SCFCR ports. |
| 1199 | */ |
| 1200 | reg = sci_getreg(port, SCFCR); |
| 1201 | if (reg->size) |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 1202 | serial_port_out(port, SCFCR, |
| 1203 | serial_port_in(port, SCFCR) | |
| 1204 | SCFCR_LOOP); |
Paul Mundt | dc7e3ef | 2011-11-24 20:20:53 +0900 | [diff] [blame] | 1205 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | } |
| 1207 | |
| 1208 | static unsigned int sci_get_mctrl(struct uart_port *port) |
| 1209 | { |
Paul Mundt | cdf7c42 | 2011-11-24 20:18:32 +0900 | [diff] [blame] | 1210 | /* |
| 1211 | * CTS/RTS is handled in hardware when supported, while nothing |
| 1212 | * else is wired up. Keep it simple and simply assert DSR/CAR. |
| 1213 | */ |
| 1214 | return TIOCM_DSR | TIOCM_CAR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | } |
| 1216 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1217 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
| 1218 | static void sci_dma_tx_complete(void *arg) |
| 1219 | { |
| 1220 | struct sci_port *s = arg; |
| 1221 | struct uart_port *port = &s->port; |
| 1222 | struct circ_buf *xmit = &port->state->xmit; |
| 1223 | unsigned long flags; |
| 1224 | |
| 1225 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
| 1226 | |
| 1227 | spin_lock_irqsave(&port->lock, flags); |
| 1228 | |
Magnus Damm | f354a38 | 2010-03-19 04:47:01 +0000 | [diff] [blame] | 1229 | xmit->tail += sg_dma_len(&s->sg_tx); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1230 | xmit->tail &= UART_XMIT_SIZE - 1; |
| 1231 | |
Magnus Damm | f354a38 | 2010-03-19 04:47:01 +0000 | [diff] [blame] | 1232 | port->icount.tx += sg_dma_len(&s->sg_tx); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1233 | |
| 1234 | async_tx_ack(s->desc_tx); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1235 | s->desc_tx = NULL; |
| 1236 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1237 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 1238 | uart_write_wakeup(port); |
| 1239 | |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1240 | if (!uart_circ_empty(xmit)) { |
Yoshii Takashi | 49d4bca | 2012-03-14 16:14:43 +0900 | [diff] [blame] | 1241 | s->cookie_tx = 0; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1242 | schedule_work(&s->work_tx); |
Yoshii Takashi | 49d4bca | 2012-03-14 16:14:43 +0900 | [diff] [blame] | 1243 | } else { |
| 1244 | s->cookie_tx = -EINVAL; |
| 1245 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1246 | u16 ctrl = serial_port_in(port, SCSCR); |
| 1247 | serial_port_out(port, SCSCR, ctrl & ~SCSCR_TIE); |
Yoshii Takashi | 49d4bca | 2012-03-14 16:14:43 +0900 | [diff] [blame] | 1248 | } |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1249 | } |
| 1250 | |
| 1251 | spin_unlock_irqrestore(&port->lock, flags); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1252 | } |
| 1253 | |
| 1254 | /* Locking: called with port lock held */ |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 1255 | static int sci_dma_rx_push(struct sci_port *s, size_t count) |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1256 | { |
| 1257 | struct uart_port *port = &s->port; |
Jiri Slaby | 227434f | 2013-01-03 15:53:01 +0100 | [diff] [blame] | 1258 | struct tty_port *tport = &port->state->port; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1259 | int i, active, room; |
| 1260 | |
Jiri Slaby | 227434f | 2013-01-03 15:53:01 +0100 | [diff] [blame] | 1261 | room = tty_buffer_request_room(tport, count); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1262 | |
| 1263 | if (s->active_rx == s->cookie_rx[0]) { |
| 1264 | active = 0; |
| 1265 | } else if (s->active_rx == s->cookie_rx[1]) { |
| 1266 | active = 1; |
| 1267 | } else { |
| 1268 | dev_err(port->dev, "cookie %d not found!\n", s->active_rx); |
| 1269 | return 0; |
| 1270 | } |
| 1271 | |
| 1272 | if (room < count) |
Laurent Pinchart | e2afca6 | 2013-12-11 13:40:31 +0100 | [diff] [blame] | 1273 | dev_warn(port->dev, "Rx overrun: dropping %zu bytes\n", |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1274 | count - room); |
| 1275 | if (!room) |
| 1276 | return room; |
| 1277 | |
| 1278 | for (i = 0; i < room; i++) |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 1279 | tty_insert_flip_char(tport, ((u8 *)sg_virt(&s->sg_rx[active]))[i], |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1280 | TTY_NORMAL); |
| 1281 | |
| 1282 | port->icount.rx += room; |
| 1283 | |
| 1284 | return room; |
| 1285 | } |
| 1286 | |
| 1287 | static void sci_dma_rx_complete(void *arg) |
| 1288 | { |
| 1289 | struct sci_port *s = arg; |
| 1290 | struct uart_port *port = &s->port; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1291 | unsigned long flags; |
| 1292 | int count; |
| 1293 | |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 1294 | dev_dbg(port->dev, "%s(%d) active #%d\n", |
| 1295 | __func__, port->line, s->active_rx); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1296 | |
| 1297 | spin_lock_irqsave(&port->lock, flags); |
| 1298 | |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 1299 | count = sci_dma_rx_push(s, s->buf_len_rx); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1300 | |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1301 | mod_timer(&s->rx_timer, jiffies + s->rx_timeout); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1302 | |
| 1303 | spin_unlock_irqrestore(&port->lock, flags); |
| 1304 | |
| 1305 | if (count) |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 1306 | tty_flip_buffer_push(&port->state->port); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1307 | |
| 1308 | schedule_work(&s->work_rx); |
| 1309 | } |
| 1310 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1311 | static void sci_rx_dma_release(struct sci_port *s, bool enable_pio) |
| 1312 | { |
| 1313 | struct dma_chan *chan = s->chan_rx; |
| 1314 | struct uart_port *port = &s->port; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1315 | |
| 1316 | s->chan_rx = NULL; |
| 1317 | s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL; |
| 1318 | dma_release_channel(chan); |
Guennadi Liakhovetski | 85b8e3f | 2010-05-21 15:22:40 +0000 | [diff] [blame] | 1319 | if (sg_dma_address(&s->sg_rx[0])) |
| 1320 | dma_free_coherent(port->dev, s->buf_len_rx * 2, |
| 1321 | sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0])); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1322 | if (enable_pio) |
| 1323 | sci_start_rx(port); |
| 1324 | } |
| 1325 | |
| 1326 | static void sci_tx_dma_release(struct sci_port *s, bool enable_pio) |
| 1327 | { |
| 1328 | struct dma_chan *chan = s->chan_tx; |
| 1329 | struct uart_port *port = &s->port; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1330 | |
| 1331 | s->chan_tx = NULL; |
| 1332 | s->cookie_tx = -EINVAL; |
| 1333 | dma_release_channel(chan); |
| 1334 | if (enable_pio) |
| 1335 | sci_start_tx(port); |
| 1336 | } |
| 1337 | |
| 1338 | static void sci_submit_rx(struct sci_port *s) |
| 1339 | { |
| 1340 | struct dma_chan *chan = s->chan_rx; |
| 1341 | int i; |
| 1342 | |
| 1343 | for (i = 0; i < 2; i++) { |
| 1344 | struct scatterlist *sg = &s->sg_rx[i]; |
| 1345 | struct dma_async_tx_descriptor *desc; |
| 1346 | |
Alexandre Bounine | 1605282 | 2012-03-08 16:11:18 -0500 | [diff] [blame] | 1347 | desc = dmaengine_prep_slave_sg(chan, |
Vinod Koul | a485df4 | 2011-10-14 10:47:38 +0530 | [diff] [blame] | 1348 | sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1349 | |
| 1350 | if (desc) { |
| 1351 | s->desc_rx[i] = desc; |
| 1352 | desc->callback = sci_dma_rx_complete; |
| 1353 | desc->callback_param = s; |
| 1354 | s->cookie_rx[i] = desc->tx_submit(desc); |
| 1355 | } |
| 1356 | |
| 1357 | if (!desc || s->cookie_rx[i] < 0) { |
| 1358 | if (i) { |
| 1359 | async_tx_ack(s->desc_rx[0]); |
| 1360 | s->cookie_rx[0] = -EINVAL; |
| 1361 | } |
| 1362 | if (desc) { |
| 1363 | async_tx_ack(desc); |
| 1364 | s->cookie_rx[i] = -EINVAL; |
| 1365 | } |
| 1366 | dev_warn(s->port.dev, |
| 1367 | "failed to re-start DMA, using PIO\n"); |
| 1368 | sci_rx_dma_release(s, true); |
| 1369 | return; |
| 1370 | } |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 1371 | dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n", |
| 1372 | __func__, s->cookie_rx[i], i); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1373 | } |
| 1374 | |
| 1375 | s->active_rx = s->cookie_rx[0]; |
| 1376 | |
| 1377 | dma_async_issue_pending(chan); |
| 1378 | } |
| 1379 | |
| 1380 | static void work_fn_rx(struct work_struct *work) |
| 1381 | { |
| 1382 | struct sci_port *s = container_of(work, struct sci_port, work_rx); |
| 1383 | struct uart_port *port = &s->port; |
| 1384 | struct dma_async_tx_descriptor *desc; |
| 1385 | int new; |
| 1386 | |
| 1387 | if (s->active_rx == s->cookie_rx[0]) { |
| 1388 | new = 0; |
| 1389 | } else if (s->active_rx == s->cookie_rx[1]) { |
| 1390 | new = 1; |
| 1391 | } else { |
| 1392 | dev_err(port->dev, "cookie %d not found!\n", s->active_rx); |
| 1393 | return; |
| 1394 | } |
| 1395 | desc = s->desc_rx[new]; |
| 1396 | |
| 1397 | if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) != |
Vinod Koul | 0b3d7d3 | 2013-10-16 21:06:19 +0530 | [diff] [blame] | 1398 | DMA_COMPLETE) { |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1399 | /* Handle incomplete DMA receive */ |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1400 | struct dma_chan *chan = s->chan_rx; |
Guennadi Liakhovetski | 4dc4c51 | 2012-07-30 21:28:47 +0200 | [diff] [blame] | 1401 | struct shdma_desc *sh_desc = container_of(desc, |
| 1402 | struct shdma_desc, async_tx); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1403 | unsigned long flags; |
| 1404 | int count; |
| 1405 | |
Vinod Koul | 2bcd90d | 2014-10-11 21:10:37 +0530 | [diff] [blame] | 1406 | dmaengine_terminate_all(chan); |
Laurent Pinchart | e2afca6 | 2013-12-11 13:40:31 +0100 | [diff] [blame] | 1407 | dev_dbg(port->dev, "Read %zu bytes with cookie %d\n", |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1408 | sh_desc->partial, sh_desc->cookie); |
| 1409 | |
| 1410 | spin_lock_irqsave(&port->lock, flags); |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 1411 | count = sci_dma_rx_push(s, sh_desc->partial); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1412 | spin_unlock_irqrestore(&port->lock, flags); |
| 1413 | |
| 1414 | if (count) |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 1415 | tty_flip_buffer_push(&port->state->port); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1416 | |
| 1417 | sci_submit_rx(s); |
| 1418 | |
| 1419 | return; |
| 1420 | } |
| 1421 | |
| 1422 | s->cookie_rx[new] = desc->tx_submit(desc); |
| 1423 | if (s->cookie_rx[new] < 0) { |
| 1424 | dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n"); |
| 1425 | sci_rx_dma_release(s, true); |
| 1426 | return; |
| 1427 | } |
| 1428 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1429 | s->active_rx = s->cookie_rx[!new]; |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1430 | |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 1431 | dev_dbg(port->dev, "%s: cookie %d #%d, new active #%d\n", |
| 1432 | __func__, s->cookie_rx[new], new, s->active_rx); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1433 | } |
| 1434 | |
| 1435 | static void work_fn_tx(struct work_struct *work) |
| 1436 | { |
| 1437 | struct sci_port *s = container_of(work, struct sci_port, work_tx); |
| 1438 | struct dma_async_tx_descriptor *desc; |
| 1439 | struct dma_chan *chan = s->chan_tx; |
| 1440 | struct uart_port *port = &s->port; |
| 1441 | struct circ_buf *xmit = &port->state->xmit; |
| 1442 | struct scatterlist *sg = &s->sg_tx; |
| 1443 | |
| 1444 | /* |
| 1445 | * DMA is idle now. |
| 1446 | * Port xmit buffer is already mapped, and it is one page... Just adjust |
| 1447 | * offsets and lengths. Since it is a circular buffer, we have to |
| 1448 | * transmit till the end, and then the rest. Take the port lock to get a |
| 1449 | * consistent xmit buffer state. |
| 1450 | */ |
| 1451 | spin_lock_irq(&port->lock); |
| 1452 | sg->offset = xmit->tail & (UART_XMIT_SIZE - 1); |
Magnus Damm | f354a38 | 2010-03-19 04:47:01 +0000 | [diff] [blame] | 1453 | sg_dma_address(sg) = (sg_dma_address(sg) & ~(UART_XMIT_SIZE - 1)) + |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1454 | sg->offset; |
Magnus Damm | f354a38 | 2010-03-19 04:47:01 +0000 | [diff] [blame] | 1455 | sg_dma_len(sg) = min((int)CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE), |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1456 | CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE)); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1457 | spin_unlock_irq(&port->lock); |
| 1458 | |
Magnus Damm | f354a38 | 2010-03-19 04:47:01 +0000 | [diff] [blame] | 1459 | BUG_ON(!sg_dma_len(sg)); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1460 | |
Alexandre Bounine | 1605282 | 2012-03-08 16:11:18 -0500 | [diff] [blame] | 1461 | desc = dmaengine_prep_slave_sg(chan, |
Vinod Koul | a485df4 | 2011-10-14 10:47:38 +0530 | [diff] [blame] | 1462 | sg, s->sg_len_tx, DMA_MEM_TO_DEV, |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1463 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| 1464 | if (!desc) { |
| 1465 | /* switch to PIO */ |
| 1466 | sci_tx_dma_release(s, true); |
| 1467 | return; |
| 1468 | } |
| 1469 | |
| 1470 | dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE); |
| 1471 | |
| 1472 | spin_lock_irq(&port->lock); |
| 1473 | s->desc_tx = desc; |
| 1474 | desc->callback = sci_dma_tx_complete; |
| 1475 | desc->callback_param = s; |
| 1476 | spin_unlock_irq(&port->lock); |
| 1477 | s->cookie_tx = desc->tx_submit(desc); |
| 1478 | if (s->cookie_tx < 0) { |
| 1479 | dev_warn(port->dev, "Failed submitting Tx DMA descriptor\n"); |
| 1480 | /* switch to PIO */ |
| 1481 | sci_tx_dma_release(s, true); |
| 1482 | return; |
| 1483 | } |
| 1484 | |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 1485 | dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", |
| 1486 | __func__, xmit->buf, xmit->tail, xmit->head, s->cookie_tx); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1487 | |
| 1488 | dma_async_issue_pending(chan); |
| 1489 | } |
| 1490 | #endif |
| 1491 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 1492 | static void sci_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | { |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1494 | struct sci_port *s = to_sci_port(port); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 1495 | unsigned short ctrl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1497 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
Guennadi Liakhovetski | d1d4b10 | 2010-05-23 16:39:09 +0000 | [diff] [blame] | 1498 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1499 | u16 new, scr = serial_port_in(port, SCSCR); |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1500 | if (s->chan_tx) |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 1501 | new = scr | SCSCR_TDRQE; |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1502 | else |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 1503 | new = scr & ~SCSCR_TDRQE; |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1504 | if (new != scr) |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1505 | serial_port_out(port, SCSCR, new); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1506 | } |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1507 | |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1508 | if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) && |
Yoshii Takashi | 49d4bca | 2012-03-14 16:14:43 +0900 | [diff] [blame] | 1509 | s->cookie_tx < 0) { |
| 1510 | s->cookie_tx = 0; |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1511 | schedule_work(&s->work_tx); |
Yoshii Takashi | 49d4bca | 2012-03-14 16:14:43 +0900 | [diff] [blame] | 1512 | } |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1513 | #endif |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1514 | |
Guennadi Liakhovetski | d1d4b10 | 2010-05-23 16:39:09 +0000 | [diff] [blame] | 1515 | if (!s->chan_tx || port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1516 | /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */ |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1517 | ctrl = serial_port_in(port, SCSCR); |
| 1518 | serial_port_out(port, SCSCR, ctrl | SCSCR_TIE); |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1519 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | } |
| 1521 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 1522 | static void sci_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | unsigned short ctrl; |
| 1525 | |
| 1526 | /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */ |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1527 | ctrl = serial_port_in(port, SCSCR); |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1528 | |
Guennadi Liakhovetski | d1d4b10 | 2010-05-23 16:39:09 +0000 | [diff] [blame] | 1529 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 1530 | ctrl &= ~SCSCR_TDRQE; |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1531 | |
Paul Mundt | 8e69861 | 2009-06-24 19:44:32 +0900 | [diff] [blame] | 1532 | ctrl &= ~SCSCR_TIE; |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1533 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1534 | serial_port_out(port, SCSCR, ctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | } |
| 1536 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1537 | static void sci_start_rx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | unsigned short ctrl; |
| 1540 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1541 | ctrl = serial_port_in(port, SCSCR) | port_rx_irq_mask(port); |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1542 | |
Guennadi Liakhovetski | d1d4b10 | 2010-05-23 16:39:09 +0000 | [diff] [blame] | 1543 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 1544 | ctrl &= ~SCSCR_RDRQE; |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1545 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1546 | serial_port_out(port, SCSCR, ctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | } |
| 1548 | |
| 1549 | static void sci_stop_rx(struct uart_port *port) |
| 1550 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | unsigned short ctrl; |
| 1552 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1553 | ctrl = serial_port_in(port, SCSCR); |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1554 | |
Guennadi Liakhovetski | d1d4b10 | 2010-05-23 16:39:09 +0000 | [diff] [blame] | 1555 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 1556 | ctrl &= ~SCSCR_RDRQE; |
Paul Mundt | f43dc23 | 2011-01-13 15:06:28 +0900 | [diff] [blame] | 1557 | |
| 1558 | ctrl &= ~port_rx_irq_mask(port); |
| 1559 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1560 | serial_port_out(port, SCSCR, ctrl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | } |
| 1562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | static void sci_break_ctl(struct uart_port *port, int break_state) |
| 1564 | { |
Shimoda, Yoshihiro | bbb4ce5 | 2012-04-06 09:59:14 +0900 | [diff] [blame] | 1565 | struct sci_port *s = to_sci_port(port); |
Shimoda, Yoshihiro | a4e02f6 | 2012-04-12 19:19:21 +0900 | [diff] [blame] | 1566 | struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR; |
Shimoda, Yoshihiro | bbb4ce5 | 2012-04-06 09:59:14 +0900 | [diff] [blame] | 1567 | unsigned short scscr, scsptr; |
| 1568 | |
Shimoda, Yoshihiro | a4e02f6 | 2012-04-12 19:19:21 +0900 | [diff] [blame] | 1569 | /* check wheter the port has SCSPTR */ |
| 1570 | if (!reg->size) { |
Shimoda, Yoshihiro | bbb4ce5 | 2012-04-06 09:59:14 +0900 | [diff] [blame] | 1571 | /* |
| 1572 | * Not supported by hardware. Most parts couple break and rx |
| 1573 | * interrupts together, with break detection always enabled. |
| 1574 | */ |
Shimoda, Yoshihiro | a4e02f6 | 2012-04-12 19:19:21 +0900 | [diff] [blame] | 1575 | return; |
Shimoda, Yoshihiro | bbb4ce5 | 2012-04-06 09:59:14 +0900 | [diff] [blame] | 1576 | } |
Shimoda, Yoshihiro | a4e02f6 | 2012-04-12 19:19:21 +0900 | [diff] [blame] | 1577 | |
| 1578 | scsptr = serial_port_in(port, SCSPTR); |
| 1579 | scscr = serial_port_in(port, SCSCR); |
| 1580 | |
| 1581 | if (break_state == -1) { |
| 1582 | scsptr = (scsptr | SCSPTR_SPB2IO) & ~SCSPTR_SPB2DT; |
| 1583 | scscr &= ~SCSCR_TE; |
| 1584 | } else { |
| 1585 | scsptr = (scsptr | SCSPTR_SPB2DT) & ~SCSPTR_SPB2IO; |
| 1586 | scscr |= SCSCR_TE; |
| 1587 | } |
| 1588 | |
| 1589 | serial_port_out(port, SCSPTR, scsptr); |
| 1590 | serial_port_out(port, SCSCR, scscr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | } |
| 1592 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1593 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
| 1594 | static bool filter(struct dma_chan *chan, void *slave) |
| 1595 | { |
| 1596 | struct sh_dmae_slave *param = slave; |
| 1597 | |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 1598 | dev_dbg(chan->device->dev, "%s: slave ID %d\n", |
| 1599 | __func__, param->shdma_slave.slave_id); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1600 | |
Guennadi Liakhovetski | d6fa5a4 | 2012-05-09 17:09:17 +0200 | [diff] [blame] | 1601 | chan->private = ¶m->shdma_slave; |
Guennadi Liakhovetski | 937bb6e | 2011-06-24 13:56:15 +0200 | [diff] [blame] | 1602 | return true; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1603 | } |
| 1604 | |
| 1605 | static void rx_timer_fn(unsigned long arg) |
| 1606 | { |
| 1607 | struct sci_port *s = (struct sci_port *)arg; |
| 1608 | struct uart_port *port = &s->port; |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1609 | u16 scr = serial_port_in(port, SCSCR); |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1610 | |
Guennadi Liakhovetski | d1d4b10 | 2010-05-23 16:39:09 +0000 | [diff] [blame] | 1611 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 1612 | scr &= ~SCSCR_RDRQE; |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 1613 | enable_irq(s->irqs[SCIx_RXI_IRQ]); |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1614 | } |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1615 | serial_port_out(port, SCSCR, scr | SCSCR_RIE); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1616 | dev_dbg(port->dev, "DMA Rx timed out\n"); |
| 1617 | schedule_work(&s->work_rx); |
| 1618 | } |
| 1619 | |
| 1620 | static void sci_request_dma(struct uart_port *port) |
| 1621 | { |
| 1622 | struct sci_port *s = to_sci_port(port); |
| 1623 | struct sh_dmae_slave *param; |
| 1624 | struct dma_chan *chan; |
| 1625 | dma_cap_mask_t mask; |
| 1626 | int nent; |
| 1627 | |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 1628 | dev_dbg(port->dev, "%s: port %d\n", __func__, port->line); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1629 | |
Guennadi Liakhovetski | 937bb6e | 2011-06-24 13:56:15 +0200 | [diff] [blame] | 1630 | if (s->cfg->dma_slave_tx <= 0 || s->cfg->dma_slave_rx <= 0) |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1631 | return; |
| 1632 | |
| 1633 | dma_cap_zero(mask); |
| 1634 | dma_cap_set(DMA_SLAVE, mask); |
| 1635 | |
| 1636 | param = &s->param_tx; |
| 1637 | |
| 1638 | /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */ |
Guennadi Liakhovetski | d6fa5a4 | 2012-05-09 17:09:17 +0200 | [diff] [blame] | 1639 | param->shdma_slave.slave_id = s->cfg->dma_slave_tx; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1640 | |
| 1641 | s->cookie_tx = -EINVAL; |
| 1642 | chan = dma_request_channel(mask, filter, param); |
| 1643 | dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan); |
| 1644 | if (chan) { |
| 1645 | s->chan_tx = chan; |
| 1646 | sg_init_table(&s->sg_tx, 1); |
| 1647 | /* UART circular tx buffer is an aligned page. */ |
Laurent Pinchart | e2afca6 | 2013-12-11 13:40:31 +0100 | [diff] [blame] | 1648 | BUG_ON((uintptr_t)port->state->xmit.buf & ~PAGE_MASK); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1649 | sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf), |
Laurent Pinchart | e2afca6 | 2013-12-11 13:40:31 +0100 | [diff] [blame] | 1650 | UART_XMIT_SIZE, |
| 1651 | (uintptr_t)port->state->xmit.buf & ~PAGE_MASK); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1652 | nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE); |
| 1653 | if (!nent) |
| 1654 | sci_tx_dma_release(s, false); |
| 1655 | else |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 1656 | dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", |
| 1657 | __func__, |
Laurent Pinchart | e2afca6 | 2013-12-11 13:40:31 +0100 | [diff] [blame] | 1658 | sg_dma_len(&s->sg_tx), port->state->xmit.buf, |
| 1659 | &sg_dma_address(&s->sg_tx)); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1660 | |
| 1661 | s->sg_len_tx = nent; |
| 1662 | |
| 1663 | INIT_WORK(&s->work_tx, work_fn_tx); |
| 1664 | } |
| 1665 | |
| 1666 | param = &s->param_rx; |
| 1667 | |
| 1668 | /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */ |
Guennadi Liakhovetski | d6fa5a4 | 2012-05-09 17:09:17 +0200 | [diff] [blame] | 1669 | param->shdma_slave.slave_id = s->cfg->dma_slave_rx; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1670 | |
| 1671 | chan = dma_request_channel(mask, filter, param); |
| 1672 | dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan); |
| 1673 | if (chan) { |
| 1674 | dma_addr_t dma[2]; |
| 1675 | void *buf[2]; |
| 1676 | int i; |
| 1677 | |
| 1678 | s->chan_rx = chan; |
| 1679 | |
| 1680 | s->buf_len_rx = 2 * max(16, (int)port->fifosize); |
| 1681 | buf[0] = dma_alloc_coherent(port->dev, s->buf_len_rx * 2, |
| 1682 | &dma[0], GFP_KERNEL); |
| 1683 | |
| 1684 | if (!buf[0]) { |
| 1685 | dev_warn(port->dev, |
| 1686 | "failed to allocate dma buffer, using PIO\n"); |
| 1687 | sci_rx_dma_release(s, true); |
| 1688 | return; |
| 1689 | } |
| 1690 | |
| 1691 | buf[1] = buf[0] + s->buf_len_rx; |
| 1692 | dma[1] = dma[0] + s->buf_len_rx; |
| 1693 | |
| 1694 | for (i = 0; i < 2; i++) { |
| 1695 | struct scatterlist *sg = &s->sg_rx[i]; |
| 1696 | |
| 1697 | sg_init_table(sg, 1); |
| 1698 | sg_set_page(sg, virt_to_page(buf[i]), s->buf_len_rx, |
Laurent Pinchart | e2afca6 | 2013-12-11 13:40:31 +0100 | [diff] [blame] | 1699 | (uintptr_t)buf[i] & ~PAGE_MASK); |
Magnus Damm | f354a38 | 2010-03-19 04:47:01 +0000 | [diff] [blame] | 1700 | sg_dma_address(sg) = dma[i]; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1701 | } |
| 1702 | |
| 1703 | INIT_WORK(&s->work_rx, work_fn_rx); |
| 1704 | setup_timer(&s->rx_timer, rx_timer_fn, (unsigned long)s); |
| 1705 | |
| 1706 | sci_submit_rx(s); |
| 1707 | } |
| 1708 | } |
| 1709 | |
| 1710 | static void sci_free_dma(struct uart_port *port) |
| 1711 | { |
| 1712 | struct sci_port *s = to_sci_port(port); |
| 1713 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1714 | if (s->chan_tx) |
| 1715 | sci_tx_dma_release(s, false); |
| 1716 | if (s->chan_rx) |
| 1717 | sci_rx_dma_release(s, false); |
| 1718 | } |
Paul Mundt | 27bd107 | 2011-01-19 15:37:31 +0900 | [diff] [blame] | 1719 | #else |
| 1720 | static inline void sci_request_dma(struct uart_port *port) |
| 1721 | { |
| 1722 | } |
| 1723 | |
| 1724 | static inline void sci_free_dma(struct uart_port *port) |
| 1725 | { |
| 1726 | } |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1727 | #endif |
| 1728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | static int sci_startup(struct uart_port *port) |
| 1730 | { |
Magnus Damm | a5660ad | 2009-01-21 15:14:38 +0000 | [diff] [blame] | 1731 | struct sci_port *s = to_sci_port(port); |
Shinya Kuribayashi | 33b48e1 | 2012-11-16 10:54:49 +0900 | [diff] [blame] | 1732 | unsigned long flags; |
Paul Mundt | 073e84c | 2011-01-19 17:30:53 +0900 | [diff] [blame] | 1733 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1735 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
| 1736 | |
Paul Mundt | 073e84c | 2011-01-19 17:30:53 +0900 | [diff] [blame] | 1737 | ret = sci_request_irq(s); |
| 1738 | if (unlikely(ret < 0)) |
| 1739 | return ret; |
| 1740 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1741 | sci_request_dma(port); |
Paul Mundt | 073e84c | 2011-01-19 17:30:53 +0900 | [diff] [blame] | 1742 | |
Shinya Kuribayashi | 33b48e1 | 2012-11-16 10:54:49 +0900 | [diff] [blame] | 1743 | spin_lock_irqsave(&port->lock, flags); |
Yoshinori Sato | d656901 | 2005-10-14 15:59:12 -0700 | [diff] [blame] | 1744 | sci_start_tx(port); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1745 | sci_start_rx(port); |
Shinya Kuribayashi | 33b48e1 | 2012-11-16 10:54:49 +0900 | [diff] [blame] | 1746 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | |
| 1748 | return 0; |
| 1749 | } |
| 1750 | |
| 1751 | static void sci_shutdown(struct uart_port *port) |
| 1752 | { |
Magnus Damm | a5660ad | 2009-01-21 15:14:38 +0000 | [diff] [blame] | 1753 | struct sci_port *s = to_sci_port(port); |
Shinya Kuribayashi | 33b48e1 | 2012-11-16 10:54:49 +0900 | [diff] [blame] | 1754 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1756 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
| 1757 | |
Shinya Kuribayashi | 33b48e1 | 2012-11-16 10:54:49 +0900 | [diff] [blame] | 1758 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | sci_stop_rx(port); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 1760 | sci_stop_tx(port); |
Shinya Kuribayashi | 33b48e1 | 2012-11-16 10:54:49 +0900 | [diff] [blame] | 1761 | spin_unlock_irqrestore(&port->lock, flags); |
Paul Mundt | 073e84c | 2011-01-19 17:30:53 +0900 | [diff] [blame] | 1762 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1763 | sci_free_dma(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | sci_free_irq(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | } |
| 1766 | |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 1767 | static unsigned int sci_scbrr_calc(struct sci_port *s, unsigned int bps, |
Paul Mundt | 26c92f3 | 2009-06-24 18:23:52 +0900 | [diff] [blame] | 1768 | unsigned long freq) |
| 1769 | { |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 1770 | if (s->sampling_rate) |
| 1771 | return DIV_ROUND_CLOSEST(freq, s->sampling_rate * bps) - 1; |
| 1772 | |
Paul Mundt | 26c92f3 | 2009-06-24 18:23:52 +0900 | [diff] [blame] | 1773 | /* Warn, but use a safe default */ |
| 1774 | WARN_ON(1); |
Paul Mundt | e8183a6 | 2011-01-19 17:51:37 +0900 | [diff] [blame] | 1775 | |
Paul Mundt | 26c92f3 | 2009-06-24 18:23:52 +0900 | [diff] [blame] | 1776 | return ((freq + 16 * bps) / (32 * bps) - 1); |
| 1777 | } |
| 1778 | |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1779 | /* calculate frame length from SMR */ |
| 1780 | static int sci_baud_calc_frame_len(unsigned int smr_val) |
| 1781 | { |
| 1782 | int len = 10; |
| 1783 | |
| 1784 | if (smr_val & SCSMR_CHR) |
| 1785 | len--; |
| 1786 | if (smr_val & SCSMR_PE) |
| 1787 | len++; |
| 1788 | if (smr_val & SCSMR_STOP) |
| 1789 | len++; |
| 1790 | |
| 1791 | return len; |
| 1792 | } |
| 1793 | |
| 1794 | |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1795 | /* calculate sample rate, BRR, and clock select for HSCIF */ |
| 1796 | static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq, |
| 1797 | int *brr, unsigned int *srr, |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1798 | unsigned int *cks, int frame_len) |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1799 | { |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1800 | int sr, c, br, err, recv_margin; |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1801 | int min_err = 1000; /* 100% */ |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1802 | int recv_max_margin = 0; |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1803 | |
| 1804 | /* Find the combination of sample rate and clock select with the |
| 1805 | smallest deviation from the desired baud rate. */ |
| 1806 | for (sr = 8; sr <= 32; sr++) { |
| 1807 | for (c = 0; c <= 3; c++) { |
| 1808 | /* integerized formulas from HSCIF documentation */ |
Nobuhiro Iwamatsu | b7d6639 | 2014-07-14 16:09:58 +0900 | [diff] [blame] | 1809 | br = DIV_ROUND_CLOSEST(freq, (sr * |
| 1810 | (1 << (2 * c + 1)) * bps)) - 1; |
Nobuhiro Iwamatsu | bcb9973 | 2014-07-14 16:09:59 +0900 | [diff] [blame] | 1811 | br = clamp(br, 0, 255); |
Nobuhiro Iwamatsu | b7d6639 | 2014-07-14 16:09:58 +0900 | [diff] [blame] | 1812 | err = DIV_ROUND_CLOSEST(freq, ((br + 1) * bps * sr * |
| 1813 | (1 << (2 * c + 1)) / 1000)) - |
| 1814 | 1000; |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1815 | /* Calc recv margin |
| 1816 | * M: Receive margin (%) |
| 1817 | * N: Ratio of bit rate to clock (N = sampling rate) |
| 1818 | * D: Clock duty (D = 0 to 1.0) |
| 1819 | * L: Frame length (L = 9 to 12) |
| 1820 | * F: Absolute value of clock frequency deviation |
| 1821 | * |
| 1822 | * M = |(0.5 - 1 / 2 * N) - ((L - 0.5) * F) - |
| 1823 | * (|D - 0.5| / N * (1 + F))| |
| 1824 | * NOTE: Usually, treat D for 0.5, F is 0 by this |
| 1825 | * calculation. |
| 1826 | */ |
| 1827 | recv_margin = abs((500 - |
| 1828 | DIV_ROUND_CLOSEST(1000, sr << 1)) / 10); |
Nobuhiro Iwamatsu | f53297f | 2014-11-20 07:58:27 +0900 | [diff] [blame^] | 1829 | if (abs(min_err) > abs(err)) { |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1830 | min_err = err; |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1831 | recv_max_margin = recv_margin; |
| 1832 | } else if ((min_err == err) && |
| 1833 | (recv_margin > recv_max_margin)) |
| 1834 | recv_max_margin = recv_margin; |
| 1835 | else |
| 1836 | continue; |
| 1837 | |
| 1838 | *brr = br; |
| 1839 | *srr = sr - 1; |
| 1840 | *cks = c; |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1841 | } |
| 1842 | } |
| 1843 | |
| 1844 | if (min_err == 1000) { |
| 1845 | WARN_ON(1); |
| 1846 | /* use defaults */ |
| 1847 | *brr = 255; |
| 1848 | *srr = 15; |
| 1849 | *cks = 0; |
| 1850 | } |
| 1851 | } |
| 1852 | |
Magnus Damm | 1ba7622 | 2011-08-03 03:47:36 +0000 | [diff] [blame] | 1853 | static void sci_reset(struct uart_port *port) |
| 1854 | { |
Paul Mundt | 0979e0e | 2011-11-24 18:35:49 +0900 | [diff] [blame] | 1855 | struct plat_sci_reg *reg; |
Magnus Damm | 1ba7622 | 2011-08-03 03:47:36 +0000 | [diff] [blame] | 1856 | unsigned int status; |
| 1857 | |
| 1858 | do { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1859 | status = serial_port_in(port, SCxSR); |
Magnus Damm | 1ba7622 | 2011-08-03 03:47:36 +0000 | [diff] [blame] | 1860 | } while (!(status & SCxSR_TEND(port))); |
| 1861 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1862 | serial_port_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ |
Magnus Damm | 1ba7622 | 2011-08-03 03:47:36 +0000 | [diff] [blame] | 1863 | |
Paul Mundt | 0979e0e | 2011-11-24 18:35:49 +0900 | [diff] [blame] | 1864 | reg = sci_getreg(port, SCFCR); |
| 1865 | if (reg->size) |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1866 | serial_port_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); |
Magnus Damm | 1ba7622 | 2011-08-03 03:47:36 +0000 | [diff] [blame] | 1867 | } |
| 1868 | |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1869 | static void sci_set_termios(struct uart_port *port, struct ktermios *termios, |
| 1870 | struct ktermios *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1871 | { |
Paul Mundt | 00b9de9 | 2009-06-24 17:53:33 +0900 | [diff] [blame] | 1872 | struct sci_port *s = to_sci_port(port); |
Paul Mundt | 0979e0e | 2011-11-24 18:35:49 +0900 | [diff] [blame] | 1873 | struct plat_sci_reg *reg; |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1874 | unsigned int baud, smr_val = 0, max_baud, cks = 0; |
Paul Mundt | a2159b5 | 2008-10-02 19:09:13 +0900 | [diff] [blame] | 1875 | int t = -1; |
Simon Horman | d4759de | 2013-06-20 21:09:45 +0900 | [diff] [blame] | 1876 | unsigned int srr = 15; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1878 | if ((termios->c_cflag & CSIZE) == CS7) |
| 1879 | smr_val |= SCSMR_CHR; |
| 1880 | if (termios->c_cflag & PARENB) |
| 1881 | smr_val |= SCSMR_PE; |
| 1882 | if (termios->c_cflag & PARODD) |
| 1883 | smr_val |= SCSMR_PE | SCSMR_ODD; |
| 1884 | if (termios->c_cflag & CSTOPB) |
| 1885 | smr_val |= SCSMR_STOP; |
| 1886 | |
Magnus Damm | 154280f | 2009-12-22 03:37:28 +0000 | [diff] [blame] | 1887 | /* |
| 1888 | * earlyprintk comes here early on with port->uartclk set to zero. |
| 1889 | * the clock framework is not up and running at this point so here |
| 1890 | * we assume that 115200 is the maximum baud rate. please note that |
| 1891 | * the baud rate is not programmed during earlyprintk - it is assumed |
| 1892 | * that the previous boot loader has enabled required clocks and |
| 1893 | * setup the baud rate generator hardware for us already. |
| 1894 | */ |
| 1895 | max_baud = port->uartclk ? port->uartclk / 16 : 115200; |
| 1896 | |
| 1897 | baud = uart_get_baud_rate(port, termios, old, 0, max_baud); |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1898 | if (likely(baud && port->uartclk)) { |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 1899 | if (s->cfg->type == PORT_HSCIF) { |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1900 | int frame_len = sci_baud_calc_frame_len(smr_val); |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1901 | sci_baud_calc_hscif(baud, port->uartclk, &t, &srr, |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1902 | &cks, frame_len); |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1903 | } else { |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 1904 | t = sci_scbrr_calc(s, baud, port->uartclk); |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1905 | for (cks = 0; t >= 256 && cks <= 3; cks++) |
| 1906 | t >>= 2; |
| 1907 | } |
| 1908 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | |
Paul Mundt | 23241d4 | 2011-06-28 13:55:31 +0900 | [diff] [blame] | 1910 | sci_port_enable(s); |
Alexandre Courbot | 3600338 | 2011-03-03 08:04:42 +0000 | [diff] [blame] | 1911 | |
Magnus Damm | 1ba7622 | 2011-08-03 03:47:36 +0000 | [diff] [blame] | 1912 | sci_reset(port); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 1913 | |
Nobuhiro Iwamatsu | 730c4e7 | 2014-07-14 16:10:00 +0900 | [diff] [blame] | 1914 | smr_val |= serial_port_in(port, SCSMR) & 3; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 1915 | |
| 1916 | uart_update_timeout(port, termios->c_cflag, baud); |
| 1917 | |
Takashi Yoshii | 9d482cc | 2012-11-16 10:52:49 +0900 | [diff] [blame] | 1918 | dev_dbg(port->dev, "%s: SMR %x, cks %x, t %x, SCSCR %x\n", |
| 1919 | __func__, smr_val, cks, t, s->cfg->scscr); |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1920 | |
Takashi Yoshii | 4ffc3cd | 2012-11-16 10:52:22 +0900 | [diff] [blame] | 1921 | if (t >= 0) { |
Geert Uytterhoeven | 26de4f1 | 2014-03-11 11:11:19 +0100 | [diff] [blame] | 1922 | serial_port_out(port, SCSMR, (smr_val & ~SCSMR_CKS) | cks); |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1923 | serial_port_out(port, SCBRR, t); |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 1924 | reg = sci_getreg(port, HSSRR); |
| 1925 | if (reg->size) |
| 1926 | serial_port_out(port, HSSRR, srr | HSCIF_SRE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */ |
Takashi Yoshii | 9d482cc | 2012-11-16 10:52:49 +0900 | [diff] [blame] | 1928 | } else |
| 1929 | serial_port_out(port, SCSMR, smr_val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | |
Paul Mundt | d570164 | 2008-12-16 20:07:27 +0900 | [diff] [blame] | 1931 | sci_init_pins(port, termios->c_cflag); |
Paul Mundt | 0979e0e | 2011-11-24 18:35:49 +0900 | [diff] [blame] | 1932 | |
Paul Mundt | 73c3d53 | 2011-12-02 19:02:06 +0900 | [diff] [blame] | 1933 | reg = sci_getreg(port, SCFCR); |
| 1934 | if (reg->size) { |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1935 | unsigned short ctrl = serial_port_in(port, SCFCR); |
Paul Mundt | 0979e0e | 2011-11-24 18:35:49 +0900 | [diff] [blame] | 1936 | |
Paul Mundt | 73c3d53 | 2011-12-02 19:02:06 +0900 | [diff] [blame] | 1937 | if (s->cfg->capabilities & SCIx_HAVE_RTSCTS) { |
Paul Mundt | faf02f8 | 2011-12-02 17:44:50 +0900 | [diff] [blame] | 1938 | if (termios->c_cflag & CRTSCTS) |
| 1939 | ctrl |= SCFCR_MCE; |
| 1940 | else |
| 1941 | ctrl &= ~SCFCR_MCE; |
Paul Mundt | faf02f8 | 2011-12-02 17:44:50 +0900 | [diff] [blame] | 1942 | } |
Paul Mundt | 73c3d53 | 2011-12-02 19:02:06 +0900 | [diff] [blame] | 1943 | |
| 1944 | /* |
| 1945 | * As we've done a sci_reset() above, ensure we don't |
| 1946 | * interfere with the FIFOs while toggling MCE. As the |
| 1947 | * reset values could still be set, simply mask them out. |
| 1948 | */ |
| 1949 | ctrl &= ~(SCFCR_RFRST | SCFCR_TFRST); |
| 1950 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1951 | serial_port_out(port, SCFCR, ctrl); |
Paul Mundt | 0979e0e | 2011-11-24 18:35:49 +0900 | [diff] [blame] | 1952 | } |
Paul Mundt | b7a76e4 | 2006-02-01 03:06:06 -0800 | [diff] [blame] | 1953 | |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 1954 | serial_port_out(port, SCSCR, s->cfg->scscr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1956 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
| 1957 | /* |
| 1958 | * Calculate delay for 1.5 DMA buffers: see |
| 1959 | * drivers/serial/serial_core.c::uart_update_timeout(). With 10 bits |
| 1960 | * (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above function |
| 1961 | * calculates 1 jiffie for the data plus 5 jiffies for the "slop(e)." |
| 1962 | * Then below we calculate 3 jiffies (12ms) for 1.5 DMA buffers (3 FIFO |
| 1963 | * sizes), but it has been found out experimentally, that this is not |
| 1964 | * enough: the driver too often needlessly runs on a DMA timeout. 20ms |
| 1965 | * as a minimum seem to work perfectly. |
| 1966 | */ |
| 1967 | if (s->chan_rx) { |
| 1968 | s->rx_timeout = (port->timeout - HZ / 50) * s->buf_len_rx * 3 / |
| 1969 | port->fifosize / 2; |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 1970 | dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n", |
Guennadi Liakhovetski | 3089f38 | 2010-03-19 13:53:04 +0000 | [diff] [blame] | 1971 | s->rx_timeout * 1000 / HZ, port->timeout); |
| 1972 | if (s->rx_timeout < msecs_to_jiffies(20)) |
| 1973 | s->rx_timeout = msecs_to_jiffies(20); |
| 1974 | } |
| 1975 | #endif |
| 1976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | if ((termios->c_cflag & CREAD) != 0) |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 1978 | sci_start_rx(port); |
Alexandre Courbot | 3600338 | 2011-03-03 08:04:42 +0000 | [diff] [blame] | 1979 | |
Paul Mundt | 23241d4 | 2011-06-28 13:55:31 +0900 | [diff] [blame] | 1980 | sci_port_disable(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | } |
| 1982 | |
Teppei Kamijou | 0174e5c | 2012-11-16 10:51:55 +0900 | [diff] [blame] | 1983 | static void sci_pm(struct uart_port *port, unsigned int state, |
| 1984 | unsigned int oldstate) |
| 1985 | { |
| 1986 | struct sci_port *sci_port = to_sci_port(port); |
| 1987 | |
| 1988 | switch (state) { |
Geert Uytterhoeven | d3dfe5d | 2014-03-11 11:11:20 +0100 | [diff] [blame] | 1989 | case UART_PM_STATE_OFF: |
Teppei Kamijou | 0174e5c | 2012-11-16 10:51:55 +0900 | [diff] [blame] | 1990 | sci_port_disable(sci_port); |
| 1991 | break; |
| 1992 | default: |
| 1993 | sci_port_enable(sci_port); |
| 1994 | break; |
| 1995 | } |
| 1996 | } |
| 1997 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1998 | static const char *sci_type(struct uart_port *port) |
| 1999 | { |
| 2000 | switch (port->type) { |
Michael Trimarchi | e7c98dc | 2008-11-13 18:18:35 +0900 | [diff] [blame] | 2001 | case PORT_IRDA: |
| 2002 | return "irda"; |
| 2003 | case PORT_SCI: |
| 2004 | return "sci"; |
| 2005 | case PORT_SCIF: |
| 2006 | return "scif"; |
| 2007 | case PORT_SCIFA: |
| 2008 | return "scifa"; |
Guennadi Liakhovetski | d1d4b10 | 2010-05-23 16:39:09 +0000 | [diff] [blame] | 2009 | case PORT_SCIFB: |
| 2010 | return "scifb"; |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 2011 | case PORT_HSCIF: |
| 2012 | return "hscif"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | } |
| 2014 | |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 2015 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | } |
| 2017 | |
Paul Mundt | e265164 | 2011-01-20 21:24:03 +0900 | [diff] [blame] | 2018 | static inline unsigned long sci_port_size(struct uart_port *port) |
| 2019 | { |
| 2020 | /* |
| 2021 | * Pick an arbitrary size that encapsulates all of the base |
| 2022 | * registers by default. This can be optimized later, or derived |
| 2023 | * from platform resource data at such a time that ports begin to |
| 2024 | * behave more erratically. |
| 2025 | */ |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 2026 | if (port->type == PORT_HSCIF) |
| 2027 | return 96; |
| 2028 | else |
| 2029 | return 64; |
Paul Mundt | e265164 | 2011-01-20 21:24:03 +0900 | [diff] [blame] | 2030 | } |
| 2031 | |
Paul Mundt | f6e9495 | 2011-01-21 15:25:36 +0900 | [diff] [blame] | 2032 | static int sci_remap_port(struct uart_port *port) |
| 2033 | { |
| 2034 | unsigned long size = sci_port_size(port); |
| 2035 | |
| 2036 | /* |
| 2037 | * Nothing to do if there's already an established membase. |
| 2038 | */ |
| 2039 | if (port->membase) |
| 2040 | return 0; |
| 2041 | |
| 2042 | if (port->flags & UPF_IOREMAP) { |
| 2043 | port->membase = ioremap_nocache(port->mapbase, size); |
| 2044 | if (unlikely(!port->membase)) { |
| 2045 | dev_err(port->dev, "can't remap port#%d\n", port->line); |
| 2046 | return -ENXIO; |
| 2047 | } |
| 2048 | } else { |
| 2049 | /* |
| 2050 | * For the simple (and majority of) cases where we don't |
| 2051 | * need to do any remapping, just cast the cookie |
| 2052 | * directly. |
| 2053 | */ |
Jingoo Han | 3af4e96 | 2014-02-05 09:56:37 +0900 | [diff] [blame] | 2054 | port->membase = (void __iomem *)(uintptr_t)port->mapbase; |
Paul Mundt | f6e9495 | 2011-01-21 15:25:36 +0900 | [diff] [blame] | 2055 | } |
| 2056 | |
| 2057 | return 0; |
| 2058 | } |
| 2059 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | static void sci_release_port(struct uart_port *port) |
| 2061 | { |
Paul Mundt | e265164 | 2011-01-20 21:24:03 +0900 | [diff] [blame] | 2062 | if (port->flags & UPF_IOREMAP) { |
| 2063 | iounmap(port->membase); |
| 2064 | port->membase = NULL; |
| 2065 | } |
| 2066 | |
| 2067 | release_mem_region(port->mapbase, sci_port_size(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | } |
| 2069 | |
| 2070 | static int sci_request_port(struct uart_port *port) |
| 2071 | { |
Paul Mundt | e265164 | 2011-01-20 21:24:03 +0900 | [diff] [blame] | 2072 | unsigned long size = sci_port_size(port); |
| 2073 | struct resource *res; |
Paul Mundt | f6e9495 | 2011-01-21 15:25:36 +0900 | [diff] [blame] | 2074 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | |
Paul Mundt | 1020520 | 2011-01-21 16:00:31 +0900 | [diff] [blame] | 2076 | res = request_mem_region(port->mapbase, size, dev_name(port->dev)); |
Paul Mundt | e265164 | 2011-01-20 21:24:03 +0900 | [diff] [blame] | 2077 | if (unlikely(res == NULL)) |
| 2078 | return -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | |
Paul Mundt | f6e9495 | 2011-01-21 15:25:36 +0900 | [diff] [blame] | 2080 | ret = sci_remap_port(port); |
| 2081 | if (unlikely(ret != 0)) { |
| 2082 | release_resource(res); |
| 2083 | return ret; |
Paul Mundt | 7ff731a | 2008-10-01 15:46:58 +0900 | [diff] [blame] | 2084 | } |
Paul Mundt | e265164 | 2011-01-20 21:24:03 +0900 | [diff] [blame] | 2085 | |
| 2086 | return 0; |
| 2087 | } |
| 2088 | |
| 2089 | static void sci_config_port(struct uart_port *port, int flags) |
| 2090 | { |
| 2091 | if (flags & UART_CONFIG_TYPE) { |
| 2092 | struct sci_port *sport = to_sci_port(port); |
| 2093 | |
| 2094 | port->type = sport->cfg->type; |
| 2095 | sci_request_port(port); |
| 2096 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | } |
| 2098 | |
| 2099 | static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 2100 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | if (ser->baud_base < 2400) |
| 2102 | /* No paper tape reader for Mitch.. */ |
| 2103 | return -EINVAL; |
| 2104 | |
| 2105 | return 0; |
| 2106 | } |
| 2107 | |
| 2108 | static struct uart_ops sci_uart_ops = { |
| 2109 | .tx_empty = sci_tx_empty, |
| 2110 | .set_mctrl = sci_set_mctrl, |
| 2111 | .get_mctrl = sci_get_mctrl, |
| 2112 | .start_tx = sci_start_tx, |
| 2113 | .stop_tx = sci_stop_tx, |
| 2114 | .stop_rx = sci_stop_rx, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | .break_ctl = sci_break_ctl, |
| 2116 | .startup = sci_startup, |
| 2117 | .shutdown = sci_shutdown, |
| 2118 | .set_termios = sci_set_termios, |
Teppei Kamijou | 0174e5c | 2012-11-16 10:51:55 +0900 | [diff] [blame] | 2119 | .pm = sci_pm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | .type = sci_type, |
| 2121 | .release_port = sci_release_port, |
| 2122 | .request_port = sci_request_port, |
| 2123 | .config_port = sci_config_port, |
| 2124 | .verify_port = sci_verify_port, |
Paul Mundt | 07d2a1a | 2008-12-11 19:06:43 +0900 | [diff] [blame] | 2125 | #ifdef CONFIG_CONSOLE_POLL |
| 2126 | .poll_get_char = sci_poll_get_char, |
| 2127 | .poll_put_char = sci_poll_put_char, |
| 2128 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | }; |
| 2130 | |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 2131 | static int sci_init_single(struct platform_device *dev, |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2132 | struct sci_port *sci_port, unsigned int index, |
| 2133 | struct plat_sci_port *p, bool early) |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2134 | { |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 2135 | struct uart_port *port = &sci_port->port; |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2136 | const struct resource *res; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2137 | unsigned int sampling_rate; |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2138 | unsigned int i; |
Paul Mundt | 3127c6b | 2011-06-28 13:44:37 +0900 | [diff] [blame] | 2139 | int ret; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2140 | |
Paul Mundt | 50f0959 | 2011-12-02 20:09:48 +0900 | [diff] [blame] | 2141 | sci_port->cfg = p; |
| 2142 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 2143 | port->ops = &sci_uart_ops; |
| 2144 | port->iotype = UPIO_MEM; |
| 2145 | port->line = index; |
Markus Pietrek | 75136d4 | 2010-01-15 08:33:20 +0900 | [diff] [blame] | 2146 | |
Laurent Pinchart | 89b5c1a | 2013-12-06 10:59:52 +0100 | [diff] [blame] | 2147 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
| 2148 | if (res == NULL) |
| 2149 | return -ENOMEM; |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2150 | |
Laurent Pinchart | 89b5c1a | 2013-12-06 10:59:52 +0100 | [diff] [blame] | 2151 | port->mapbase = res->start; |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2152 | |
Laurent Pinchart | 89b5c1a | 2013-12-06 10:59:52 +0100 | [diff] [blame] | 2153 | for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) |
| 2154 | sci_port->irqs[i] = platform_get_irq(dev, i); |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2155 | |
Laurent Pinchart | 89b5c1a | 2013-12-06 10:59:52 +0100 | [diff] [blame] | 2156 | /* The SCI generates several interrupts. They can be muxed together or |
| 2157 | * connected to different interrupt lines. In the muxed case only one |
| 2158 | * interrupt resource is specified. In the non-muxed case three or four |
| 2159 | * interrupt resources are specified, as the BRI interrupt is optional. |
| 2160 | */ |
| 2161 | if (sci_port->irqs[0] < 0) |
| 2162 | return -ENXIO; |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2163 | |
Laurent Pinchart | 89b5c1a | 2013-12-06 10:59:52 +0100 | [diff] [blame] | 2164 | if (sci_port->irqs[1] < 0) { |
| 2165 | sci_port->irqs[1] = sci_port->irqs[0]; |
| 2166 | sci_port->irqs[2] = sci_port->irqs[0]; |
| 2167 | sci_port->irqs[3] = sci_port->irqs[0]; |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2168 | } |
| 2169 | |
Paul Mundt | 3127c6b | 2011-06-28 13:44:37 +0900 | [diff] [blame] | 2170 | if (p->regtype == SCIx_PROBE_REGTYPE) { |
| 2171 | ret = sci_probe_regmap(p); |
Rafael J. Wysocki | fc97114 | 2011-08-08 00:26:50 +0200 | [diff] [blame] | 2172 | if (unlikely(ret)) |
Paul Mundt | 3127c6b | 2011-06-28 13:44:37 +0900 | [diff] [blame] | 2173 | return ret; |
| 2174 | } |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 2175 | |
Laurent Pinchart | b545e4f | 2013-12-06 10:59:19 +0100 | [diff] [blame] | 2176 | switch (p->type) { |
| 2177 | case PORT_SCIFB: |
| 2178 | port->fifosize = 256; |
| 2179 | sci_port->overrun_bit = 9; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2180 | sampling_rate = 16; |
Laurent Pinchart | b545e4f | 2013-12-06 10:59:19 +0100 | [diff] [blame] | 2181 | break; |
| 2182 | case PORT_HSCIF: |
| 2183 | port->fifosize = 128; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2184 | sampling_rate = 0; |
Laurent Pinchart | b545e4f | 2013-12-06 10:59:19 +0100 | [diff] [blame] | 2185 | sci_port->overrun_bit = 0; |
| 2186 | break; |
| 2187 | case PORT_SCIFA: |
| 2188 | port->fifosize = 64; |
| 2189 | sci_port->overrun_bit = 9; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2190 | sampling_rate = 16; |
Laurent Pinchart | b545e4f | 2013-12-06 10:59:19 +0100 | [diff] [blame] | 2191 | break; |
| 2192 | case PORT_SCIF: |
| 2193 | port->fifosize = 16; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2194 | if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) { |
Laurent Pinchart | b545e4f | 2013-12-06 10:59:19 +0100 | [diff] [blame] | 2195 | sci_port->overrun_bit = 9; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2196 | sampling_rate = 16; |
| 2197 | } else { |
Laurent Pinchart | b545e4f | 2013-12-06 10:59:19 +0100 | [diff] [blame] | 2198 | sci_port->overrun_bit = 0; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2199 | sampling_rate = 32; |
| 2200 | } |
Laurent Pinchart | b545e4f | 2013-12-06 10:59:19 +0100 | [diff] [blame] | 2201 | break; |
| 2202 | default: |
| 2203 | port->fifosize = 1; |
| 2204 | sci_port->overrun_bit = 5; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2205 | sampling_rate = 32; |
Laurent Pinchart | b545e4f | 2013-12-06 10:59:19 +0100 | [diff] [blame] | 2206 | break; |
| 2207 | } |
| 2208 | |
Laurent Pinchart | 878fbb91 | 2013-12-06 10:59:51 +0100 | [diff] [blame] | 2209 | /* SCIFA on sh7723 and sh7724 need a custom sampling rate that doesn't |
| 2210 | * match the SoC datasheet, this should be investigated. Let platform |
| 2211 | * data override the sampling rate for now. |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2212 | */ |
Laurent Pinchart | 878fbb91 | 2013-12-06 10:59:51 +0100 | [diff] [blame] | 2213 | sci_port->sampling_rate = p->sampling_rate ? p->sampling_rate |
| 2214 | : sampling_rate; |
Laurent Pinchart | ec09c5e | 2013-12-06 10:59:20 +0100 | [diff] [blame] | 2215 | |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2216 | if (!early) { |
Paul Mundt | c7ed1ab | 2010-03-10 18:35:14 +0900 | [diff] [blame] | 2217 | sci_port->iclk = clk_get(&dev->dev, "sci_ick"); |
| 2218 | if (IS_ERR(sci_port->iclk)) { |
| 2219 | sci_port->iclk = clk_get(&dev->dev, "peripheral_clk"); |
| 2220 | if (IS_ERR(sci_port->iclk)) { |
| 2221 | dev_err(&dev->dev, "can't get iclk\n"); |
| 2222 | return PTR_ERR(sci_port->iclk); |
| 2223 | } |
| 2224 | } |
| 2225 | |
| 2226 | /* |
| 2227 | * The function clock is optional, ignore it if we can't |
| 2228 | * find it. |
| 2229 | */ |
| 2230 | sci_port->fclk = clk_get(&dev->dev, "sci_fck"); |
| 2231 | if (IS_ERR(sci_port->fclk)) |
| 2232 | sci_port->fclk = NULL; |
| 2233 | |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 2234 | port->dev = &dev->dev; |
Magnus Damm | 5e50d2d | 2011-04-19 10:38:25 +0000 | [diff] [blame] | 2235 | |
| 2236 | pm_runtime_enable(&dev->dev); |
Magnus Damm | 7b6fd3b | 2009-12-14 10:24:42 +0000 | [diff] [blame] | 2237 | } |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2238 | |
Magnus Damm | 7ed7e07 | 2009-01-21 15:14:14 +0000 | [diff] [blame] | 2239 | sci_port->break_timer.data = (unsigned long)sci_port; |
| 2240 | sci_port->break_timer.function = sci_break_timer; |
| 2241 | init_timer(&sci_port->break_timer); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2242 | |
Paul Mundt | debf950 | 2011-06-08 18:19:37 +0900 | [diff] [blame] | 2243 | /* |
| 2244 | * Establish some sensible defaults for the error detection. |
| 2245 | */ |
Laurent Pinchart | 3ae988d | 2013-12-06 10:59:17 +0100 | [diff] [blame] | 2246 | sci_port->error_mask = (p->type == PORT_SCI) ? |
Paul Mundt | debf950 | 2011-06-08 18:19:37 +0900 | [diff] [blame] | 2247 | SCI_DEFAULT_ERROR_MASK : SCIF_DEFAULT_ERROR_MASK; |
| 2248 | |
| 2249 | /* |
| 2250 | * Establish sensible defaults for the overrun detection, unless |
| 2251 | * the part has explicitly disabled support for it. |
| 2252 | */ |
Paul Mundt | debf950 | 2011-06-08 18:19:37 +0900 | [diff] [blame] | 2253 | |
Laurent Pinchart | 3ae988d | 2013-12-06 10:59:17 +0100 | [diff] [blame] | 2254 | /* |
| 2255 | * Make the error mask inclusive of overrun detection, if |
| 2256 | * supported. |
| 2257 | */ |
| 2258 | sci_port->error_mask |= 1 << sci_port->overrun_bit; |
Paul Mundt | debf950 | 2011-06-08 18:19:37 +0900 | [diff] [blame] | 2259 | |
Paul Mundt | ce6738b | 2011-01-19 15:24:40 +0900 | [diff] [blame] | 2260 | port->type = p->type; |
Laurent Pinchart | b6e4a3f | 2013-12-06 10:59:14 +0100 | [diff] [blame] | 2261 | port->flags = UPF_FIXED_PORT | p->flags; |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 2262 | port->regshift = p->regshift; |
Paul Mundt | ce6738b | 2011-01-19 15:24:40 +0900 | [diff] [blame] | 2263 | |
| 2264 | /* |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 2265 | * The UART port needs an IRQ value, so we peg this to the RX IRQ |
Paul Mundt | ce6738b | 2011-01-19 15:24:40 +0900 | [diff] [blame] | 2266 | * for the multi-IRQ ports, which is where we are primarily |
| 2267 | * concerned with the shutdown path synchronization. |
| 2268 | * |
| 2269 | * For the muxed case there's nothing more to do. |
| 2270 | */ |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2271 | port->irq = sci_port->irqs[SCIx_RXI_IRQ]; |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 2272 | port->irqflags = 0; |
Guennadi Liakhovetski | 73a19e4 | 2010-03-02 11:39:15 +0900 | [diff] [blame] | 2273 | |
Paul Mundt | 61a6976 | 2011-06-14 12:40:19 +0900 | [diff] [blame] | 2274 | port->serial_in = sci_serial_in; |
| 2275 | port->serial_out = sci_serial_out; |
| 2276 | |
Guennadi Liakhovetski | 937bb6e | 2011-06-24 13:56:15 +0200 | [diff] [blame] | 2277 | if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) |
| 2278 | dev_dbg(port->dev, "DMA tx %d, rx %d\n", |
| 2279 | p->dma_slave_tx, p->dma_slave_rx); |
Magnus Damm | 7ed7e07 | 2009-01-21 15:14:14 +0000 | [diff] [blame] | 2280 | |
Paul Mundt | c7ed1ab | 2010-03-10 18:35:14 +0900 | [diff] [blame] | 2281 | return 0; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2282 | } |
| 2283 | |
Laurent Pinchart | 6dae142 | 2012-06-13 00:28:23 +0200 | [diff] [blame] | 2284 | static void sci_cleanup_single(struct sci_port *port) |
| 2285 | { |
Laurent Pinchart | 6dae142 | 2012-06-13 00:28:23 +0200 | [diff] [blame] | 2286 | clk_put(port->iclk); |
| 2287 | clk_put(port->fclk); |
| 2288 | |
| 2289 | pm_runtime_disable(port->port.dev); |
| 2290 | } |
| 2291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
Magnus Damm | dc8e6f5 | 2009-01-21 15:14:06 +0000 | [diff] [blame] | 2293 | static void serial_console_putchar(struct uart_port *port, int ch) |
| 2294 | { |
| 2295 | sci_poll_put_char(port, ch); |
| 2296 | } |
| 2297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | /* |
| 2299 | * Print a string to the serial port trying not to disturb |
| 2300 | * any possible real use of the port... |
| 2301 | */ |
| 2302 | static void serial_console_write(struct console *co, const char *s, |
| 2303 | unsigned count) |
| 2304 | { |
Paul Mundt | 906b17d | 2011-01-21 16:19:53 +0900 | [diff] [blame] | 2305 | struct sci_port *sci_port = &sci_ports[co->index]; |
| 2306 | struct uart_port *port = &sci_port->port; |
Shinya Kuribayashi | 40f70c0 | 2012-11-16 10:54:15 +0900 | [diff] [blame] | 2307 | unsigned short bits, ctrl; |
| 2308 | unsigned long flags; |
| 2309 | int locked = 1; |
| 2310 | |
| 2311 | local_irq_save(flags); |
| 2312 | if (port->sysrq) |
| 2313 | locked = 0; |
| 2314 | else if (oops_in_progress) |
| 2315 | locked = spin_trylock(&port->lock); |
| 2316 | else |
| 2317 | spin_lock(&port->lock); |
| 2318 | |
| 2319 | /* first save the SCSCR then disable the interrupts */ |
| 2320 | ctrl = serial_port_in(port, SCSCR); |
| 2321 | serial_port_out(port, SCSCR, sci_port->cfg->scscr); |
Paul Mundt | 07d2a1a | 2008-12-11 19:06:43 +0900 | [diff] [blame] | 2322 | |
Magnus Damm | 501b825 | 2009-01-21 15:14:30 +0000 | [diff] [blame] | 2323 | uart_console_write(port, s, count, serial_console_putchar); |
Magnus Damm | 973e5d5 | 2009-02-24 15:57:12 +0900 | [diff] [blame] | 2324 | |
| 2325 | /* wait until fifo is empty and last bit has been transmitted */ |
| 2326 | bits = SCxSR_TDxE(port) | SCxSR_TEND(port); |
Paul Mundt | b12bb29 | 2012-03-30 19:50:15 +0900 | [diff] [blame] | 2327 | while ((serial_port_in(port, SCxSR) & bits) != bits) |
Magnus Damm | 973e5d5 | 2009-02-24 15:57:12 +0900 | [diff] [blame] | 2328 | cpu_relax(); |
Shinya Kuribayashi | 40f70c0 | 2012-11-16 10:54:15 +0900 | [diff] [blame] | 2329 | |
| 2330 | /* restore the SCSCR */ |
| 2331 | serial_port_out(port, SCSCR, ctrl); |
| 2332 | |
| 2333 | if (locked) |
| 2334 | spin_unlock(&port->lock); |
| 2335 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | } |
| 2337 | |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 2338 | static int serial_console_setup(struct console *co, char *options) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2339 | { |
Magnus Damm | dc8e6f5 | 2009-01-21 15:14:06 +0000 | [diff] [blame] | 2340 | struct sci_port *sci_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | struct uart_port *port; |
| 2342 | int baud = 115200; |
| 2343 | int bits = 8; |
| 2344 | int parity = 'n'; |
| 2345 | int flow = 'n'; |
| 2346 | int ret; |
| 2347 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2348 | /* |
Paul Mundt | 906b17d | 2011-01-21 16:19:53 +0900 | [diff] [blame] | 2349 | * Refuse to handle any bogus ports. |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2350 | */ |
Paul Mundt | 906b17d | 2011-01-21 16:19:53 +0900 | [diff] [blame] | 2351 | if (co->index < 0 || co->index >= SCI_NPORTS) |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2352 | return -ENODEV; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2353 | |
Paul Mundt | 906b17d | 2011-01-21 16:19:53 +0900 | [diff] [blame] | 2354 | sci_port = &sci_ports[co->index]; |
| 2355 | port = &sci_port->port; |
| 2356 | |
Alexandre Courbot | b2267a6 | 2011-02-09 03:18:46 +0000 | [diff] [blame] | 2357 | /* |
| 2358 | * Refuse to handle uninitialized ports. |
| 2359 | */ |
| 2360 | if (!port->ops) |
| 2361 | return -ENODEV; |
| 2362 | |
Paul Mundt | f6e9495 | 2011-01-21 15:25:36 +0900 | [diff] [blame] | 2363 | ret = sci_remap_port(port); |
| 2364 | if (unlikely(ret != 0)) |
| 2365 | return ret; |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2367 | if (options) |
| 2368 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 2369 | |
Paul Mundt | ab7cfb5 | 2011-06-01 14:47:42 +0900 | [diff] [blame] | 2370 | return uart_set_options(port, co, baud, parity, bits, flow); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | } |
| 2372 | |
| 2373 | static struct console serial_console = { |
| 2374 | .name = "ttySC", |
Paul Mundt | 906b17d | 2011-01-21 16:19:53 +0900 | [diff] [blame] | 2375 | .device = uart_console_device, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2376 | .write = serial_console_write, |
| 2377 | .setup = serial_console_setup, |
Paul Mundt | fa5da2f | 2007-03-08 17:27:37 +0900 | [diff] [blame] | 2378 | .flags = CON_PRINTBUFFER, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | .index = -1, |
Paul Mundt | 906b17d | 2011-01-21 16:19:53 +0900 | [diff] [blame] | 2380 | .data = &sci_uart_driver, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2381 | }; |
| 2382 | |
Magnus Damm | 7b6fd3b | 2009-12-14 10:24:42 +0000 | [diff] [blame] | 2383 | static struct console early_serial_console = { |
| 2384 | .name = "early_ttySC", |
| 2385 | .write = serial_console_write, |
| 2386 | .flags = CON_PRINTBUFFER, |
Paul Mundt | 906b17d | 2011-01-21 16:19:53 +0900 | [diff] [blame] | 2387 | .index = -1, |
Magnus Damm | 7b6fd3b | 2009-12-14 10:24:42 +0000 | [diff] [blame] | 2388 | }; |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2389 | |
Magnus Damm | 7b6fd3b | 2009-12-14 10:24:42 +0000 | [diff] [blame] | 2390 | static char early_serial_buf[32]; |
| 2391 | |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 2392 | static int sci_probe_earlyprintk(struct platform_device *pdev) |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2393 | { |
Jingoo Han | 574de55 | 2013-07-30 17:06:57 +0900 | [diff] [blame] | 2394 | struct plat_sci_port *cfg = dev_get_platdata(&pdev->dev); |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2395 | |
| 2396 | if (early_serial_console.data) |
| 2397 | return -EEXIST; |
| 2398 | |
| 2399 | early_serial_console.index = pdev->id; |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2400 | |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2401 | sci_init_single(pdev, &sci_ports[pdev->id], pdev->id, cfg, true); |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2402 | |
| 2403 | serial_console_setup(&early_serial_console, early_serial_buf); |
| 2404 | |
| 2405 | if (!strstr(early_serial_buf, "keep")) |
| 2406 | early_serial_console.flags |= CON_BOOT; |
| 2407 | |
| 2408 | register_console(&early_serial_console); |
| 2409 | return 0; |
| 2410 | } |
Nobuhiro Iwamatsu | 6a8c979 | 2011-03-24 02:20:56 +0000 | [diff] [blame] | 2411 | |
| 2412 | #define SCI_CONSOLE (&serial_console) |
| 2413 | |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2414 | #else |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 2415 | static inline int sci_probe_earlyprintk(struct platform_device *pdev) |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2416 | { |
| 2417 | return -EINVAL; |
| 2418 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | |
Nobuhiro Iwamatsu | 6a8c979 | 2011-03-24 02:20:56 +0000 | [diff] [blame] | 2420 | #define SCI_CONSOLE NULL |
| 2421 | |
| 2422 | #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2423 | |
Geert Uytterhoeven | 6c13d5d | 2014-03-11 11:11:17 +0100 | [diff] [blame] | 2424 | static const char banner[] __initconst = "SuperH (H)SCI(F) driver initialized"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | |
| 2426 | static struct uart_driver sci_uart_driver = { |
| 2427 | .owner = THIS_MODULE, |
| 2428 | .driver_name = "sci", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | .dev_name = "ttySC", |
| 2430 | .major = SCI_MAJOR, |
| 2431 | .minor = SCI_MINOR_START, |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2432 | .nr = SCI_NPORTS, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | .cons = SCI_CONSOLE, |
| 2434 | }; |
| 2435 | |
Paul Mundt | 54507f6 | 2009-05-08 23:48:33 +0900 | [diff] [blame] | 2436 | static int sci_remove(struct platform_device *dev) |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 2437 | { |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2438 | struct sci_port *port = platform_get_drvdata(dev); |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 2439 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2440 | cpufreq_unregister_notifier(&port->freq_transition, |
| 2441 | CPUFREQ_TRANSITION_NOTIFIER); |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 2442 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2443 | uart_remove_one_port(&sci_uart_driver, &port->port); |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 2444 | |
Laurent Pinchart | 6dae142 | 2012-06-13 00:28:23 +0200 | [diff] [blame] | 2445 | sci_cleanup_single(port); |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2446 | |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 2447 | return 0; |
| 2448 | } |
| 2449 | |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2450 | struct sci_port_info { |
| 2451 | unsigned int type; |
| 2452 | unsigned int regtype; |
| 2453 | }; |
| 2454 | |
| 2455 | static const struct of_device_id of_sci_match[] = { |
| 2456 | { |
| 2457 | .compatible = "renesas,scif", |
Geert Uytterhoeven | ff43da0 | 2014-03-11 11:11:18 +0100 | [diff] [blame] | 2458 | .data = &(const struct sci_port_info) { |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2459 | .type = PORT_SCIF, |
| 2460 | .regtype = SCIx_SH4_SCIF_REGTYPE, |
| 2461 | }, |
| 2462 | }, { |
| 2463 | .compatible = "renesas,scifa", |
Geert Uytterhoeven | ff43da0 | 2014-03-11 11:11:18 +0100 | [diff] [blame] | 2464 | .data = &(const struct sci_port_info) { |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2465 | .type = PORT_SCIFA, |
| 2466 | .regtype = SCIx_SCIFA_REGTYPE, |
| 2467 | }, |
| 2468 | }, { |
| 2469 | .compatible = "renesas,scifb", |
Geert Uytterhoeven | ff43da0 | 2014-03-11 11:11:18 +0100 | [diff] [blame] | 2470 | .data = &(const struct sci_port_info) { |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2471 | .type = PORT_SCIFB, |
| 2472 | .regtype = SCIx_SCIFB_REGTYPE, |
| 2473 | }, |
| 2474 | }, { |
| 2475 | .compatible = "renesas,hscif", |
Geert Uytterhoeven | ff43da0 | 2014-03-11 11:11:18 +0100 | [diff] [blame] | 2476 | .data = &(const struct sci_port_info) { |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2477 | .type = PORT_HSCIF, |
| 2478 | .regtype = SCIx_HSCIF_REGTYPE, |
| 2479 | }, |
| 2480 | }, { |
| 2481 | /* Terminator */ |
| 2482 | }, |
| 2483 | }; |
| 2484 | MODULE_DEVICE_TABLE(of, of_sci_match); |
| 2485 | |
| 2486 | static struct plat_sci_port * |
| 2487 | sci_parse_dt(struct platform_device *pdev, unsigned int *dev_id) |
| 2488 | { |
| 2489 | struct device_node *np = pdev->dev.of_node; |
| 2490 | const struct of_device_id *match; |
| 2491 | const struct sci_port_info *info; |
| 2492 | struct plat_sci_port *p; |
| 2493 | int id; |
| 2494 | |
| 2495 | if (!IS_ENABLED(CONFIG_OF) || !np) |
| 2496 | return NULL; |
| 2497 | |
| 2498 | match = of_match_node(of_sci_match, pdev->dev.of_node); |
| 2499 | if (!match) |
| 2500 | return NULL; |
| 2501 | |
| 2502 | info = match->data; |
| 2503 | |
| 2504 | p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL); |
| 2505 | if (!p) { |
| 2506 | dev_err(&pdev->dev, "failed to allocate DT config data\n"); |
| 2507 | return NULL; |
| 2508 | } |
| 2509 | |
| 2510 | /* Get the line number for the aliases node. */ |
| 2511 | id = of_alias_get_id(np, "serial"); |
| 2512 | if (id < 0) { |
| 2513 | dev_err(&pdev->dev, "failed to get alias id (%d)\n", id); |
| 2514 | return NULL; |
| 2515 | } |
| 2516 | |
| 2517 | *dev_id = id; |
| 2518 | |
| 2519 | p->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; |
| 2520 | p->type = info->type; |
| 2521 | p->regtype = info->regtype; |
| 2522 | p->scscr = SCSCR_RE | SCSCR_TE; |
| 2523 | |
| 2524 | return p; |
| 2525 | } |
| 2526 | |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 2527 | static int sci_probe_single(struct platform_device *dev, |
Magnus Damm | 0ee7071 | 2009-01-21 15:13:50 +0000 | [diff] [blame] | 2528 | unsigned int index, |
| 2529 | struct plat_sci_port *p, |
| 2530 | struct sci_port *sciport) |
| 2531 | { |
Magnus Damm | 0ee7071 | 2009-01-21 15:13:50 +0000 | [diff] [blame] | 2532 | int ret; |
| 2533 | |
| 2534 | /* Sanity check */ |
| 2535 | if (unlikely(index >= SCI_NPORTS)) { |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 2536 | dev_notice(&dev->dev, "Attempting to register port %d when only %d are available\n", |
Magnus Damm | 0ee7071 | 2009-01-21 15:13:50 +0000 | [diff] [blame] | 2537 | index+1, SCI_NPORTS); |
Joe Perches | 9b971cd | 2014-03-11 10:10:46 -0700 | [diff] [blame] | 2538 | dev_notice(&dev->dev, "Consider bumping CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); |
Laurent Pinchart | b6c5ef6 | 2012-06-13 00:28:24 +0200 | [diff] [blame] | 2539 | return -EINVAL; |
Magnus Damm | 0ee7071 | 2009-01-21 15:13:50 +0000 | [diff] [blame] | 2540 | } |
| 2541 | |
Laurent Pinchart | 1fcc91a | 2013-12-06 10:59:16 +0100 | [diff] [blame] | 2542 | ret = sci_init_single(dev, sciport, index, p, false); |
Paul Mundt | c7ed1ab | 2010-03-10 18:35:14 +0900 | [diff] [blame] | 2543 | if (ret) |
| 2544 | return ret; |
Magnus Damm | 0ee7071 | 2009-01-21 15:13:50 +0000 | [diff] [blame] | 2545 | |
Laurent Pinchart | 6dae142 | 2012-06-13 00:28:23 +0200 | [diff] [blame] | 2546 | ret = uart_add_one_port(&sci_uart_driver, &sciport->port); |
| 2547 | if (ret) { |
| 2548 | sci_cleanup_single(sciport); |
| 2549 | return ret; |
| 2550 | } |
| 2551 | |
| 2552 | return 0; |
Magnus Damm | 0ee7071 | 2009-01-21 15:13:50 +0000 | [diff] [blame] | 2553 | } |
| 2554 | |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 2555 | static int sci_probe(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2556 | { |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2557 | struct plat_sci_port *p; |
| 2558 | struct sci_port *sp; |
| 2559 | unsigned int dev_id; |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2560 | int ret; |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 2561 | |
Paul Mundt | ecdf8a4 | 2011-01-21 00:05:48 +0900 | [diff] [blame] | 2562 | /* |
| 2563 | * If we've come here via earlyprintk initialization, head off to |
| 2564 | * the special early probe. We don't have sufficient device state |
| 2565 | * to make it beyond this yet. |
| 2566 | */ |
| 2567 | if (is_early_platform_device(dev)) |
| 2568 | return sci_probe_earlyprintk(dev); |
Magnus Damm | 7b6fd3b | 2009-12-14 10:24:42 +0000 | [diff] [blame] | 2569 | |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2570 | if (dev->dev.of_node) { |
| 2571 | p = sci_parse_dt(dev, &dev_id); |
| 2572 | if (p == NULL) |
| 2573 | return -EINVAL; |
| 2574 | } else { |
| 2575 | p = dev->dev.platform_data; |
| 2576 | if (p == NULL) { |
| 2577 | dev_err(&dev->dev, "no platform data supplied\n"); |
| 2578 | return -EINVAL; |
| 2579 | } |
| 2580 | |
| 2581 | dev_id = dev->id; |
| 2582 | } |
| 2583 | |
| 2584 | sp = &sci_ports[dev_id]; |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2585 | platform_set_drvdata(dev, sp); |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 2586 | |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2587 | ret = sci_probe_single(dev, dev_id, p, sp); |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2588 | if (ret) |
Laurent Pinchart | 6dae142 | 2012-06-13 00:28:23 +0200 | [diff] [blame] | 2589 | return ret; |
Magnus Damm | e552de2 | 2009-01-21 15:13:42 +0000 | [diff] [blame] | 2590 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2591 | sp->freq_transition.notifier_call = sci_notifier; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2593 | ret = cpufreq_register_notifier(&sp->freq_transition, |
| 2594 | CPUFREQ_TRANSITION_NOTIFIER); |
Laurent Pinchart | 6dae142 | 2012-06-13 00:28:23 +0200 | [diff] [blame] | 2595 | if (unlikely(ret < 0)) { |
Geert Uytterhoeven | bf13c9a | 2014-02-28 14:21:33 +0100 | [diff] [blame] | 2596 | uart_remove_one_port(&sci_uart_driver, &sp->port); |
Laurent Pinchart | 6dae142 | 2012-06-13 00:28:23 +0200 | [diff] [blame] | 2597 | sci_cleanup_single(sp); |
| 2598 | return ret; |
| 2599 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2600 | |
| 2601 | #ifdef CONFIG_SH_STANDARD_BIOS |
| 2602 | sh_bios_gdb_detach(); |
| 2603 | #endif |
| 2604 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2605 | return 0; |
| 2606 | } |
| 2607 | |
Paul Mundt | 6daa79b | 2009-06-15 07:07:38 +0900 | [diff] [blame] | 2608 | static int sci_suspend(struct device *dev) |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2609 | { |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2610 | struct sci_port *sport = dev_get_drvdata(dev); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2611 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2612 | if (sport) |
| 2613 | uart_suspend_port(&sci_uart_driver, &sport->port); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2614 | |
| 2615 | return 0; |
| 2616 | } |
| 2617 | |
Paul Mundt | 6daa79b | 2009-06-15 07:07:38 +0900 | [diff] [blame] | 2618 | static int sci_resume(struct device *dev) |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2619 | { |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2620 | struct sci_port *sport = dev_get_drvdata(dev); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2621 | |
Paul Mundt | d535a23 | 2011-01-19 17:19:35 +0900 | [diff] [blame] | 2622 | if (sport) |
| 2623 | uart_resume_port(&sci_uart_driver, &sport->port); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2624 | |
| 2625 | return 0; |
| 2626 | } |
| 2627 | |
Alexey Dobriyan | 4714521 | 2009-12-14 18:00:08 -0800 | [diff] [blame] | 2628 | static const struct dev_pm_ops sci_dev_pm_ops = { |
Paul Mundt | 6daa79b | 2009-06-15 07:07:38 +0900 | [diff] [blame] | 2629 | .suspend = sci_suspend, |
| 2630 | .resume = sci_resume, |
| 2631 | }; |
| 2632 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2633 | static struct platform_driver sci_driver = { |
| 2634 | .probe = sci_probe, |
Uwe Kleine-König | b9e39c8 | 2009-11-24 22:07:32 +0100 | [diff] [blame] | 2635 | .remove = sci_remove, |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2636 | .driver = { |
| 2637 | .name = "sh-sci", |
| 2638 | .owner = THIS_MODULE, |
Paul Mundt | 6daa79b | 2009-06-15 07:07:38 +0900 | [diff] [blame] | 2639 | .pm = &sci_dev_pm_ops, |
Bastian Hecht | 20bdcab | 2013-12-06 10:59:54 +0100 | [diff] [blame] | 2640 | .of_match_table = of_match_ptr(of_sci_match), |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2641 | }, |
| 2642 | }; |
| 2643 | |
| 2644 | static int __init sci_init(void) |
| 2645 | { |
| 2646 | int ret; |
| 2647 | |
Geert Uytterhoeven | 6c13d5d | 2014-03-11 11:11:17 +0100 | [diff] [blame] | 2648 | pr_info("%s\n", banner); |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2649 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2650 | ret = uart_register_driver(&sci_uart_driver); |
| 2651 | if (likely(ret == 0)) { |
| 2652 | ret = platform_driver_register(&sci_driver); |
| 2653 | if (unlikely(ret)) |
| 2654 | uart_unregister_driver(&sci_uart_driver); |
| 2655 | } |
| 2656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | return ret; |
| 2658 | } |
| 2659 | |
| 2660 | static void __exit sci_exit(void) |
| 2661 | { |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2662 | platform_driver_unregister(&sci_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | uart_unregister_driver(&sci_uart_driver); |
| 2664 | } |
| 2665 | |
Magnus Damm | 7b6fd3b | 2009-12-14 10:24:42 +0000 | [diff] [blame] | 2666 | #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
| 2667 | early_platform_init_buffer("earlyprintk", &sci_driver, |
| 2668 | early_serial_buf, ARRAY_SIZE(early_serial_buf)); |
| 2669 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2670 | module_init(sci_init); |
| 2671 | module_exit(sci_exit); |
| 2672 | |
Paul Mundt | e108b2c | 2006-09-27 16:32:13 +0900 | [diff] [blame] | 2673 | MODULE_LICENSE("GPL"); |
Kay Sievers | e169c13 | 2008-04-15 14:34:35 -0700 | [diff] [blame] | 2674 | MODULE_ALIAS("platform:sh-sci"); |
Paul Mundt | 7f405f9 | 2011-06-28 13:47:40 +0900 | [diff] [blame] | 2675 | MODULE_AUTHOR("Paul Mundt"); |
Ulrich Hecht | f303b36 | 2013-05-31 17:57:01 +0200 | [diff] [blame] | 2676 | MODULE_DESCRIPTION("SuperH (H)SCI(F) serial driver"); |