Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO) |
3 | * | |
f43dc23d | 4 | * Copyright (C) 2002 - 2011 Paul Mundt |
3ea6bc3d | 5 | * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007). |
1da177e4 LT |
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). | |
d89ddd1c | 14 | * Removed SH7300 support (Jul 2007). |
1da177e4 LT |
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 | */ | |
0b3d4ef6 PM |
20 | #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
21 | #define SUPPORT_SYSRQ | |
22 | #endif | |
1da177e4 LT |
23 | |
24 | #undef DEBUG | |
25 | ||
8fb9631c LP |
26 | #include <linux/clk.h> |
27 | #include <linux/console.h> | |
28 | #include <linux/ctype.h> | |
29 | #include <linux/cpufreq.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/dmaengine.h> | |
32 | #include <linux/dma-mapping.h> | |
33 | #include <linux/err.h> | |
1da177e4 | 34 | #include <linux/errno.h> |
8fb9631c | 35 | #include <linux/init.h> |
1da177e4 | 36 | #include <linux/interrupt.h> |
1da177e4 | 37 | #include <linux/ioport.h> |
8fb9631c LP |
38 | #include <linux/major.h> |
39 | #include <linux/module.h> | |
1da177e4 | 40 | #include <linux/mm.h> |
1da177e4 | 41 | #include <linux/notifier.h> |
8fb9631c | 42 | #include <linux/platform_device.h> |
5e50d2d6 | 43 | #include <linux/pm_runtime.h> |
73a19e4c | 44 | #include <linux/scatterlist.h> |
8fb9631c LP |
45 | #include <linux/serial.h> |
46 | #include <linux/serial_sci.h> | |
47 | #include <linux/sh_dma.h> | |
5a0e3ad6 | 48 | #include <linux/slab.h> |
8fb9631c LP |
49 | #include <linux/string.h> |
50 | #include <linux/sysrq.h> | |
51 | #include <linux/timer.h> | |
52 | #include <linux/tty.h> | |
53 | #include <linux/tty_flip.h> | |
85f094ec PM |
54 | |
55 | #ifdef CONFIG_SUPERH | |
1da177e4 LT |
56 | #include <asm/sh_bios.h> |
57 | #endif | |
58 | ||
1da177e4 LT |
59 | #include "sh-sci.h" |
60 | ||
e108b2ca PM |
61 | struct sci_port { |
62 | struct uart_port port; | |
63 | ||
ce6738b6 PM |
64 | /* Platform configuration */ |
65 | struct plat_sci_port *cfg; | |
3ae988d9 LP |
66 | int overrun_bit; |
67 | unsigned int error_mask; | |
68 | ||
e108b2ca | 69 | |
e108b2ca PM |
70 | /* Break timer */ |
71 | struct timer_list break_timer; | |
72 | int break_flag; | |
1534a3b3 | 73 | |
501b825d MD |
74 | /* Interface clock */ |
75 | struct clk *iclk; | |
c7ed1ab3 PM |
76 | /* Function clock */ |
77 | struct clk *fclk; | |
edad1f20 | 78 | |
1fcc91a6 | 79 | int irqs[SCIx_NR_IRQS]; |
9174fc8f PM |
80 | char *irqstr[SCIx_NR_IRQS]; |
81 | ||
73a19e4c GL |
82 | struct dma_chan *chan_tx; |
83 | struct dma_chan *chan_rx; | |
f43dc23d | 84 | |
73a19e4c | 85 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
73a19e4c GL |
86 | struct dma_async_tx_descriptor *desc_tx; |
87 | struct dma_async_tx_descriptor *desc_rx[2]; | |
88 | dma_cookie_t cookie_tx; | |
89 | dma_cookie_t cookie_rx[2]; | |
90 | dma_cookie_t active_rx; | |
91 | struct scatterlist sg_tx; | |
92 | unsigned int sg_len_tx; | |
93 | struct scatterlist sg_rx[2]; | |
94 | size_t buf_len_rx; | |
95 | struct sh_dmae_slave param_tx; | |
96 | struct sh_dmae_slave param_rx; | |
97 | struct work_struct work_tx; | |
98 | struct work_struct work_rx; | |
99 | struct timer_list rx_timer; | |
3089f381 | 100 | unsigned int rx_timeout; |
73a19e4c | 101 | #endif |
e552de24 | 102 | |
d535a230 | 103 | struct notifier_block freq_transition; |
e108b2ca PM |
104 | }; |
105 | ||
1da177e4 | 106 | /* Function prototypes */ |
d535a230 | 107 | static void sci_start_tx(struct uart_port *port); |
b129a8cc | 108 | static void sci_stop_tx(struct uart_port *port); |
d535a230 | 109 | static void sci_start_rx(struct uart_port *port); |
1da177e4 | 110 | |
e108b2ca | 111 | #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS |
b7a76e4b | 112 | |
e108b2ca PM |
113 | static struct sci_port sci_ports[SCI_NPORTS]; |
114 | static struct uart_driver sci_uart_driver; | |
1da177e4 | 115 | |
e7c98dc7 MT |
116 | static inline struct sci_port * |
117 | to_sci_port(struct uart_port *uart) | |
118 | { | |
119 | return container_of(uart, struct sci_port, port); | |
120 | } | |
121 | ||
61a6976b PM |
122 | struct plat_sci_reg { |
123 | u8 offset, size; | |
124 | }; | |
125 | ||
126 | /* Helper for invalidating specific entries of an inherited map. */ | |
127 | #define sci_reg_invalid { .offset = 0, .size = 0 } | |
128 | ||
129 | static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { | |
130 | [SCIx_PROBE_REGTYPE] = { | |
131 | [0 ... SCIx_NR_REGS - 1] = sci_reg_invalid, | |
132 | }, | |
133 | ||
134 | /* | |
135 | * Common SCI definitions, dependent on the port's regshift | |
136 | * value. | |
137 | */ | |
138 | [SCIx_SCI_REGTYPE] = { | |
139 | [SCSMR] = { 0x00, 8 }, | |
140 | [SCBRR] = { 0x01, 8 }, | |
141 | [SCSCR] = { 0x02, 8 }, | |
142 | [SCxTDR] = { 0x03, 8 }, | |
143 | [SCxSR] = { 0x04, 8 }, | |
144 | [SCxRDR] = { 0x05, 8 }, | |
145 | [SCFCR] = sci_reg_invalid, | |
146 | [SCFDR] = sci_reg_invalid, | |
147 | [SCTFDR] = sci_reg_invalid, | |
148 | [SCRFDR] = sci_reg_invalid, | |
149 | [SCSPTR] = sci_reg_invalid, | |
150 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 151 | [HSSRR] = sci_reg_invalid, |
61a6976b PM |
152 | }, |
153 | ||
154 | /* | |
155 | * Common definitions for legacy IrDA ports, dependent on | |
156 | * regshift value. | |
157 | */ | |
158 | [SCIx_IRDA_REGTYPE] = { | |
159 | [SCSMR] = { 0x00, 8 }, | |
160 | [SCBRR] = { 0x01, 8 }, | |
161 | [SCSCR] = { 0x02, 8 }, | |
162 | [SCxTDR] = { 0x03, 8 }, | |
163 | [SCxSR] = { 0x04, 8 }, | |
164 | [SCxRDR] = { 0x05, 8 }, | |
165 | [SCFCR] = { 0x06, 8 }, | |
166 | [SCFDR] = { 0x07, 16 }, | |
167 | [SCTFDR] = sci_reg_invalid, | |
168 | [SCRFDR] = sci_reg_invalid, | |
169 | [SCSPTR] = sci_reg_invalid, | |
170 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 171 | [HSSRR] = sci_reg_invalid, |
61a6976b PM |
172 | }, |
173 | ||
174 | /* | |
175 | * Common SCIFA definitions. | |
176 | */ | |
177 | [SCIx_SCIFA_REGTYPE] = { | |
178 | [SCSMR] = { 0x00, 16 }, | |
179 | [SCBRR] = { 0x04, 8 }, | |
180 | [SCSCR] = { 0x08, 16 }, | |
181 | [SCxTDR] = { 0x20, 8 }, | |
182 | [SCxSR] = { 0x14, 16 }, | |
183 | [SCxRDR] = { 0x24, 8 }, | |
184 | [SCFCR] = { 0x18, 16 }, | |
185 | [SCFDR] = { 0x1c, 16 }, | |
186 | [SCTFDR] = sci_reg_invalid, | |
187 | [SCRFDR] = sci_reg_invalid, | |
188 | [SCSPTR] = sci_reg_invalid, | |
189 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 190 | [HSSRR] = sci_reg_invalid, |
61a6976b PM |
191 | }, |
192 | ||
193 | /* | |
194 | * Common SCIFB definitions. | |
195 | */ | |
196 | [SCIx_SCIFB_REGTYPE] = { | |
197 | [SCSMR] = { 0x00, 16 }, | |
198 | [SCBRR] = { 0x04, 8 }, | |
199 | [SCSCR] = { 0x08, 16 }, | |
200 | [SCxTDR] = { 0x40, 8 }, | |
201 | [SCxSR] = { 0x14, 16 }, | |
202 | [SCxRDR] = { 0x60, 8 }, | |
203 | [SCFCR] = { 0x18, 16 }, | |
8c66d6d2 TY |
204 | [SCFDR] = sci_reg_invalid, |
205 | [SCTFDR] = { 0x38, 16 }, | |
206 | [SCRFDR] = { 0x3c, 16 }, | |
61a6976b PM |
207 | [SCSPTR] = sci_reg_invalid, |
208 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 209 | [HSSRR] = sci_reg_invalid, |
61a6976b PM |
210 | }, |
211 | ||
3af1f8a4 PE |
212 | /* |
213 | * Common SH-2(A) SCIF definitions for ports with FIFO data | |
214 | * count registers. | |
215 | */ | |
216 | [SCIx_SH2_SCIF_FIFODATA_REGTYPE] = { | |
217 | [SCSMR] = { 0x00, 16 }, | |
218 | [SCBRR] = { 0x04, 8 }, | |
219 | [SCSCR] = { 0x08, 16 }, | |
220 | [SCxTDR] = { 0x0c, 8 }, | |
221 | [SCxSR] = { 0x10, 16 }, | |
222 | [SCxRDR] = { 0x14, 8 }, | |
223 | [SCFCR] = { 0x18, 16 }, | |
224 | [SCFDR] = { 0x1c, 16 }, | |
225 | [SCTFDR] = sci_reg_invalid, | |
226 | [SCRFDR] = sci_reg_invalid, | |
227 | [SCSPTR] = { 0x20, 16 }, | |
228 | [SCLSR] = { 0x24, 16 }, | |
f303b364 | 229 | [HSSRR] = sci_reg_invalid, |
3af1f8a4 PE |
230 | }, |
231 | ||
61a6976b PM |
232 | /* |
233 | * Common SH-3 SCIF definitions. | |
234 | */ | |
235 | [SCIx_SH3_SCIF_REGTYPE] = { | |
236 | [SCSMR] = { 0x00, 8 }, | |
237 | [SCBRR] = { 0x02, 8 }, | |
238 | [SCSCR] = { 0x04, 8 }, | |
239 | [SCxTDR] = { 0x06, 8 }, | |
240 | [SCxSR] = { 0x08, 16 }, | |
241 | [SCxRDR] = { 0x0a, 8 }, | |
242 | [SCFCR] = { 0x0c, 8 }, | |
243 | [SCFDR] = { 0x0e, 16 }, | |
244 | [SCTFDR] = sci_reg_invalid, | |
245 | [SCRFDR] = sci_reg_invalid, | |
246 | [SCSPTR] = sci_reg_invalid, | |
247 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 248 | [HSSRR] = sci_reg_invalid, |
61a6976b PM |
249 | }, |
250 | ||
251 | /* | |
252 | * Common SH-4(A) SCIF(B) definitions. | |
253 | */ | |
254 | [SCIx_SH4_SCIF_REGTYPE] = { | |
255 | [SCSMR] = { 0x00, 16 }, | |
256 | [SCBRR] = { 0x04, 8 }, | |
257 | [SCSCR] = { 0x08, 16 }, | |
258 | [SCxTDR] = { 0x0c, 8 }, | |
259 | [SCxSR] = { 0x10, 16 }, | |
260 | [SCxRDR] = { 0x14, 8 }, | |
261 | [SCFCR] = { 0x18, 16 }, | |
262 | [SCFDR] = { 0x1c, 16 }, | |
263 | [SCTFDR] = sci_reg_invalid, | |
264 | [SCRFDR] = sci_reg_invalid, | |
265 | [SCSPTR] = { 0x20, 16 }, | |
266 | [SCLSR] = { 0x24, 16 }, | |
f303b364 UH |
267 | [HSSRR] = sci_reg_invalid, |
268 | }, | |
269 | ||
270 | /* | |
271 | * Common HSCIF definitions. | |
272 | */ | |
273 | [SCIx_HSCIF_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 }, | |
286 | [HSSRR] = { 0x40, 16 }, | |
61a6976b PM |
287 | }, |
288 | ||
289 | /* | |
290 | * Common SH-4(A) SCIF(B) definitions for ports without an SCSPTR | |
291 | * register. | |
292 | */ | |
293 | [SCIx_SH4_SCIF_NO_SCSPTR_REGTYPE] = { | |
294 | [SCSMR] = { 0x00, 16 }, | |
295 | [SCBRR] = { 0x04, 8 }, | |
296 | [SCSCR] = { 0x08, 16 }, | |
297 | [SCxTDR] = { 0x0c, 8 }, | |
298 | [SCxSR] = { 0x10, 16 }, | |
299 | [SCxRDR] = { 0x14, 8 }, | |
300 | [SCFCR] = { 0x18, 16 }, | |
301 | [SCFDR] = { 0x1c, 16 }, | |
302 | [SCTFDR] = sci_reg_invalid, | |
303 | [SCRFDR] = sci_reg_invalid, | |
304 | [SCSPTR] = sci_reg_invalid, | |
305 | [SCLSR] = { 0x24, 16 }, | |
f303b364 | 306 | [HSSRR] = sci_reg_invalid, |
61a6976b PM |
307 | }, |
308 | ||
309 | /* | |
310 | * Common SH-4(A) SCIF(B) definitions for ports with FIFO data | |
311 | * count registers. | |
312 | */ | |
313 | [SCIx_SH4_SCIF_FIFODATA_REGTYPE] = { | |
314 | [SCSMR] = { 0x00, 16 }, | |
315 | [SCBRR] = { 0x04, 8 }, | |
316 | [SCSCR] = { 0x08, 16 }, | |
317 | [SCxTDR] = { 0x0c, 8 }, | |
318 | [SCxSR] = { 0x10, 16 }, | |
319 | [SCxRDR] = { 0x14, 8 }, | |
320 | [SCFCR] = { 0x18, 16 }, | |
321 | [SCFDR] = { 0x1c, 16 }, | |
322 | [SCTFDR] = { 0x1c, 16 }, /* aliased to SCFDR */ | |
323 | [SCRFDR] = { 0x20, 16 }, | |
324 | [SCSPTR] = { 0x24, 16 }, | |
325 | [SCLSR] = { 0x28, 16 }, | |
f303b364 | 326 | [HSSRR] = sci_reg_invalid, |
61a6976b PM |
327 | }, |
328 | ||
329 | /* | |
330 | * SH7705-style SCIF(B) ports, lacking both SCSPTR and SCLSR | |
331 | * registers. | |
332 | */ | |
333 | [SCIx_SH7705_SCIF_REGTYPE] = { | |
334 | [SCSMR] = { 0x00, 16 }, | |
335 | [SCBRR] = { 0x04, 8 }, | |
336 | [SCSCR] = { 0x08, 16 }, | |
337 | [SCxTDR] = { 0x20, 8 }, | |
338 | [SCxSR] = { 0x14, 16 }, | |
339 | [SCxRDR] = { 0x24, 8 }, | |
340 | [SCFCR] = { 0x18, 16 }, | |
341 | [SCFDR] = { 0x1c, 16 }, | |
342 | [SCTFDR] = sci_reg_invalid, | |
343 | [SCRFDR] = sci_reg_invalid, | |
344 | [SCSPTR] = sci_reg_invalid, | |
345 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 346 | [HSSRR] = sci_reg_invalid, |
61a6976b PM |
347 | }, |
348 | }; | |
349 | ||
72b294cf PM |
350 | #define sci_getreg(up, offset) (sci_regmap[to_sci_port(up)->cfg->regtype] + offset) |
351 | ||
61a6976b PM |
352 | /* |
353 | * The "offset" here is rather misleading, in that it refers to an enum | |
354 | * value relative to the port mapping rather than the fixed offset | |
355 | * itself, which needs to be manually retrieved from the platform's | |
356 | * register map for the given port. | |
357 | */ | |
358 | static unsigned int sci_serial_in(struct uart_port *p, int offset) | |
359 | { | |
72b294cf | 360 | struct plat_sci_reg *reg = sci_getreg(p, offset); |
61a6976b PM |
361 | |
362 | if (reg->size == 8) | |
363 | return ioread8(p->membase + (reg->offset << p->regshift)); | |
364 | else if (reg->size == 16) | |
365 | return ioread16(p->membase + (reg->offset << p->regshift)); | |
366 | else | |
367 | WARN(1, "Invalid register access\n"); | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | static void sci_serial_out(struct uart_port *p, int offset, int value) | |
373 | { | |
72b294cf | 374 | struct plat_sci_reg *reg = sci_getreg(p, offset); |
61a6976b PM |
375 | |
376 | if (reg->size == 8) | |
377 | iowrite8(value, p->membase + (reg->offset << p->regshift)); | |
378 | else if (reg->size == 16) | |
379 | iowrite16(value, p->membase + (reg->offset << p->regshift)); | |
380 | else | |
381 | WARN(1, "Invalid register access\n"); | |
382 | } | |
383 | ||
61a6976b PM |
384 | static int sci_probe_regmap(struct plat_sci_port *cfg) |
385 | { | |
386 | switch (cfg->type) { | |
387 | case PORT_SCI: | |
388 | cfg->regtype = SCIx_SCI_REGTYPE; | |
389 | break; | |
390 | case PORT_IRDA: | |
391 | cfg->regtype = SCIx_IRDA_REGTYPE; | |
392 | break; | |
393 | case PORT_SCIFA: | |
394 | cfg->regtype = SCIx_SCIFA_REGTYPE; | |
395 | break; | |
396 | case PORT_SCIFB: | |
397 | cfg->regtype = SCIx_SCIFB_REGTYPE; | |
398 | break; | |
399 | case PORT_SCIF: | |
400 | /* | |
401 | * The SH-4 is a bit of a misnomer here, although that's | |
402 | * where this particular port layout originated. This | |
403 | * configuration (or some slight variation thereof) | |
404 | * remains the dominant model for all SCIFs. | |
405 | */ | |
406 | cfg->regtype = SCIx_SH4_SCIF_REGTYPE; | |
407 | break; | |
f303b364 UH |
408 | case PORT_HSCIF: |
409 | cfg->regtype = SCIx_HSCIF_REGTYPE; | |
410 | break; | |
61a6976b PM |
411 | default: |
412 | printk(KERN_ERR "Can't probe register map for given port\n"); | |
413 | return -EINVAL; | |
414 | } | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
23241d43 PM |
419 | static void sci_port_enable(struct sci_port *sci_port) |
420 | { | |
421 | if (!sci_port->port.dev) | |
422 | return; | |
423 | ||
424 | pm_runtime_get_sync(sci_port->port.dev); | |
425 | ||
b016b646 | 426 | clk_prepare_enable(sci_port->iclk); |
23241d43 | 427 | sci_port->port.uartclk = clk_get_rate(sci_port->iclk); |
b016b646 | 428 | clk_prepare_enable(sci_port->fclk); |
23241d43 PM |
429 | } |
430 | ||
431 | static void sci_port_disable(struct sci_port *sci_port) | |
432 | { | |
433 | if (!sci_port->port.dev) | |
434 | return; | |
435 | ||
caec7038 LP |
436 | /* Cancel the break timer to ensure that the timer handler will not try |
437 | * to access the hardware with clocks and power disabled. Reset the | |
438 | * break flag to make the break debouncing state machine ready for the | |
439 | * next break. | |
440 | */ | |
441 | del_timer_sync(&sci_port->break_timer); | |
442 | sci_port->break_flag = 0; | |
443 | ||
b016b646 LP |
444 | clk_disable_unprepare(sci_port->fclk); |
445 | clk_disable_unprepare(sci_port->iclk); | |
23241d43 PM |
446 | |
447 | pm_runtime_put_sync(sci_port->port.dev); | |
448 | } | |
449 | ||
07d2a1a1 | 450 | #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE) |
1f6fd5c9 PM |
451 | |
452 | #ifdef CONFIG_CONSOLE_POLL | |
07d2a1a1 | 453 | static int sci_poll_get_char(struct uart_port *port) |
1da177e4 | 454 | { |
1da177e4 LT |
455 | unsigned short status; |
456 | int c; | |
457 | ||
e108b2ca | 458 | do { |
b12bb29f | 459 | status = serial_port_in(port, SCxSR); |
1da177e4 | 460 | if (status & SCxSR_ERRORS(port)) { |
b12bb29f | 461 | serial_port_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); |
1da177e4 LT |
462 | continue; |
463 | } | |
3f255eb3 JW |
464 | break; |
465 | } while (1); | |
466 | ||
467 | if (!(status & SCxSR_RDxF(port))) | |
468 | return NO_POLL_CHAR; | |
07d2a1a1 | 469 | |
b12bb29f | 470 | c = serial_port_in(port, SCxRDR); |
07d2a1a1 | 471 | |
e7c98dc7 | 472 | /* Dummy read */ |
b12bb29f PM |
473 | serial_port_in(port, SCxSR); |
474 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); | |
1da177e4 LT |
475 | |
476 | return c; | |
477 | } | |
1f6fd5c9 | 478 | #endif |
1da177e4 | 479 | |
07d2a1a1 | 480 | static void sci_poll_put_char(struct uart_port *port, unsigned char c) |
1da177e4 | 481 | { |
1da177e4 LT |
482 | unsigned short status; |
483 | ||
1da177e4 | 484 | do { |
b12bb29f | 485 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
486 | } while (!(status & SCxSR_TDxE(port))); |
487 | ||
b12bb29f PM |
488 | serial_port_out(port, SCxTDR, c); |
489 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port)); | |
1da177e4 | 490 | } |
07d2a1a1 | 491 | #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */ |
1da177e4 | 492 | |
61a6976b | 493 | static void sci_init_pins(struct uart_port *port, unsigned int cflag) |
1da177e4 | 494 | { |
61a6976b PM |
495 | struct sci_port *s = to_sci_port(port); |
496 | struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR; | |
1da177e4 | 497 | |
61a6976b PM |
498 | /* |
499 | * Use port-specific handler if provided. | |
500 | */ | |
501 | if (s->cfg->ops && s->cfg->ops->init_pins) { | |
502 | s->cfg->ops->init_pins(port, cflag); | |
503 | return; | |
1da177e4 | 504 | } |
41504c39 | 505 | |
61a6976b PM |
506 | /* |
507 | * For the generic path SCSPTR is necessary. Bail out if that's | |
508 | * unavailable, too. | |
509 | */ | |
510 | if (!reg->size) | |
511 | return; | |
41504c39 | 512 | |
faf02f8f PM |
513 | if ((s->cfg->capabilities & SCIx_HAVE_RTSCTS) && |
514 | ((!(cflag & CRTSCTS)))) { | |
515 | unsigned short status; | |
516 | ||
b12bb29f | 517 | status = serial_port_in(port, SCSPTR); |
faf02f8f PM |
518 | status &= ~SCSPTR_CTSIO; |
519 | status |= SCSPTR_RTSIO; | |
b12bb29f | 520 | serial_port_out(port, SCSPTR, status); /* Set RTS = 1 */ |
faf02f8f | 521 | } |
d5701647 | 522 | } |
e108b2ca | 523 | |
72b294cf | 524 | static int sci_txfill(struct uart_port *port) |
e108b2ca | 525 | { |
72b294cf | 526 | struct plat_sci_reg *reg; |
e108b2ca | 527 | |
72b294cf PM |
528 | reg = sci_getreg(port, SCTFDR); |
529 | if (reg->size) | |
63f7ad11 | 530 | return serial_port_in(port, SCTFDR) & ((port->fifosize << 1) - 1); |
c63847a3 | 531 | |
72b294cf PM |
532 | reg = sci_getreg(port, SCFDR); |
533 | if (reg->size) | |
b12bb29f | 534 | return serial_port_in(port, SCFDR) >> 8; |
d1d4b10c | 535 | |
b12bb29f | 536 | return !(serial_port_in(port, SCxSR) & SCI_TDRE); |
e108b2ca PM |
537 | } |
538 | ||
73a19e4c GL |
539 | static int sci_txroom(struct uart_port *port) |
540 | { | |
72b294cf | 541 | return port->fifosize - sci_txfill(port); |
73a19e4c GL |
542 | } |
543 | ||
544 | static int sci_rxfill(struct uart_port *port) | |
e108b2ca | 545 | { |
72b294cf PM |
546 | struct plat_sci_reg *reg; |
547 | ||
548 | reg = sci_getreg(port, SCRFDR); | |
549 | if (reg->size) | |
63f7ad11 | 550 | return serial_port_in(port, SCRFDR) & ((port->fifosize << 1) - 1); |
72b294cf PM |
551 | |
552 | reg = sci_getreg(port, SCFDR); | |
553 | if (reg->size) | |
b12bb29f | 554 | return serial_port_in(port, SCFDR) & ((port->fifosize << 1) - 1); |
72b294cf | 555 | |
b12bb29f | 556 | return (serial_port_in(port, SCxSR) & SCxSR_RDxF(port)) != 0; |
e108b2ca PM |
557 | } |
558 | ||
514820eb PM |
559 | /* |
560 | * SCI helper for checking the state of the muxed port/RXD pins. | |
561 | */ | |
562 | static inline int sci_rxd_in(struct uart_port *port) | |
563 | { | |
564 | struct sci_port *s = to_sci_port(port); | |
565 | ||
566 | if (s->cfg->port_reg <= 0) | |
567 | return 1; | |
568 | ||
0dd4d5cb | 569 | /* Cast for ARM damage */ |
e2afca69 | 570 | return !!__raw_readb((void __iomem *)(uintptr_t)s->cfg->port_reg); |
514820eb PM |
571 | } |
572 | ||
1da177e4 LT |
573 | /* ********************************************************************** * |
574 | * the interrupt related routines * | |
575 | * ********************************************************************** */ | |
576 | ||
577 | static void sci_transmit_chars(struct uart_port *port) | |
578 | { | |
ebd2c8f6 | 579 | struct circ_buf *xmit = &port->state->xmit; |
1da177e4 | 580 | unsigned int stopped = uart_tx_stopped(port); |
1da177e4 LT |
581 | unsigned short status; |
582 | unsigned short ctrl; | |
e108b2ca | 583 | int count; |
1da177e4 | 584 | |
b12bb29f | 585 | status = serial_port_in(port, SCxSR); |
1da177e4 | 586 | if (!(status & SCxSR_TDxE(port))) { |
b12bb29f | 587 | ctrl = serial_port_in(port, SCSCR); |
e7c98dc7 | 588 | if (uart_circ_empty(xmit)) |
8e698614 | 589 | ctrl &= ~SCSCR_TIE; |
e7c98dc7 | 590 | else |
8e698614 | 591 | ctrl |= SCSCR_TIE; |
b12bb29f | 592 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
593 | return; |
594 | } | |
595 | ||
72b294cf | 596 | count = sci_txroom(port); |
1da177e4 LT |
597 | |
598 | do { | |
599 | unsigned char c; | |
600 | ||
601 | if (port->x_char) { | |
602 | c = port->x_char; | |
603 | port->x_char = 0; | |
604 | } else if (!uart_circ_empty(xmit) && !stopped) { | |
605 | c = xmit->buf[xmit->tail]; | |
606 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
607 | } else { | |
608 | break; | |
609 | } | |
610 | ||
b12bb29f | 611 | serial_port_out(port, SCxTDR, c); |
1da177e4 LT |
612 | |
613 | port->icount.tx++; | |
614 | } while (--count > 0); | |
615 | ||
b12bb29f | 616 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); |
1da177e4 LT |
617 | |
618 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
619 | uart_write_wakeup(port); | |
620 | if (uart_circ_empty(xmit)) { | |
b129a8cc | 621 | sci_stop_tx(port); |
1da177e4 | 622 | } else { |
b12bb29f | 623 | ctrl = serial_port_in(port, SCSCR); |
1da177e4 | 624 | |
1a22f08d | 625 | if (port->type != PORT_SCI) { |
b12bb29f PM |
626 | serial_port_in(port, SCxSR); /* Dummy read */ |
627 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); | |
1da177e4 | 628 | } |
1da177e4 | 629 | |
8e698614 | 630 | ctrl |= SCSCR_TIE; |
b12bb29f | 631 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
632 | } |
633 | } | |
634 | ||
635 | /* On SH3, SCIF may read end-of-break as a space->mark char */ | |
e7c98dc7 | 636 | #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); }) |
1da177e4 | 637 | |
94c8b6db | 638 | static void sci_receive_chars(struct uart_port *port) |
1da177e4 | 639 | { |
e7c98dc7 | 640 | struct sci_port *sci_port = to_sci_port(port); |
227434f8 | 641 | struct tty_port *tport = &port->state->port; |
1da177e4 LT |
642 | int i, count, copied = 0; |
643 | unsigned short status; | |
33f0f88f | 644 | unsigned char flag; |
1da177e4 | 645 | |
b12bb29f | 646 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
647 | if (!(status & SCxSR_RDxF(port))) |
648 | return; | |
649 | ||
650 | while (1) { | |
1da177e4 | 651 | /* Don't copy more bytes than there is room for in the buffer */ |
227434f8 | 652 | count = tty_buffer_request_room(tport, sci_rxfill(port)); |
1da177e4 LT |
653 | |
654 | /* If for any reason we can't copy more data, we're done! */ | |
655 | if (count == 0) | |
656 | break; | |
657 | ||
658 | if (port->type == PORT_SCI) { | |
b12bb29f | 659 | char c = serial_port_in(port, SCxRDR); |
e7c98dc7 MT |
660 | if (uart_handle_sysrq_char(port, c) || |
661 | sci_port->break_flag) | |
1da177e4 | 662 | count = 0; |
e7c98dc7 | 663 | else |
92a19f9c | 664 | tty_insert_flip_char(tport, c, TTY_NORMAL); |
1da177e4 | 665 | } else { |
e7c98dc7 | 666 | for (i = 0; i < count; i++) { |
b12bb29f | 667 | char c = serial_port_in(port, SCxRDR); |
d97fbbed | 668 | |
b12bb29f | 669 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
670 | #if defined(CONFIG_CPU_SH3) |
671 | /* Skip "chars" during break */ | |
e108b2ca | 672 | if (sci_port->break_flag) { |
1da177e4 LT |
673 | if ((c == 0) && |
674 | (status & SCxSR_FER(port))) { | |
675 | count--; i--; | |
676 | continue; | |
677 | } | |
e108b2ca | 678 | |
1da177e4 | 679 | /* Nonzero => end-of-break */ |
762c69e3 | 680 | dev_dbg(port->dev, "debounce<%02x>\n", c); |
e108b2ca PM |
681 | sci_port->break_flag = 0; |
682 | ||
1da177e4 LT |
683 | if (STEPFN(c)) { |
684 | count--; i--; | |
685 | continue; | |
686 | } | |
687 | } | |
688 | #endif /* CONFIG_CPU_SH3 */ | |
7d12e780 | 689 | if (uart_handle_sysrq_char(port, c)) { |
1da177e4 LT |
690 | count--; i--; |
691 | continue; | |
692 | } | |
693 | ||
694 | /* Store data and status */ | |
73a19e4c | 695 | if (status & SCxSR_FER(port)) { |
33f0f88f | 696 | flag = TTY_FRAME; |
d97fbbed | 697 | port->icount.frame++; |
762c69e3 | 698 | dev_notice(port->dev, "frame error\n"); |
73a19e4c | 699 | } else if (status & SCxSR_PER(port)) { |
33f0f88f | 700 | flag = TTY_PARITY; |
d97fbbed | 701 | port->icount.parity++; |
762c69e3 | 702 | dev_notice(port->dev, "parity error\n"); |
33f0f88f AC |
703 | } else |
704 | flag = TTY_NORMAL; | |
762c69e3 | 705 | |
92a19f9c | 706 | tty_insert_flip_char(tport, c, flag); |
1da177e4 LT |
707 | } |
708 | } | |
709 | ||
b12bb29f PM |
710 | serial_port_in(port, SCxSR); /* dummy read */ |
711 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); | |
1da177e4 | 712 | |
1da177e4 LT |
713 | copied += count; |
714 | port->icount.rx += count; | |
715 | } | |
716 | ||
717 | if (copied) { | |
718 | /* Tell the rest of the system the news. New characters! */ | |
2e124b4a | 719 | tty_flip_buffer_push(tport); |
1da177e4 | 720 | } else { |
b12bb29f PM |
721 | serial_port_in(port, SCxSR); /* dummy read */ |
722 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); | |
1da177e4 LT |
723 | } |
724 | } | |
725 | ||
726 | #define SCI_BREAK_JIFFIES (HZ/20) | |
94c8b6db PM |
727 | |
728 | /* | |
729 | * The sci generates interrupts during the break, | |
1da177e4 LT |
730 | * 1 per millisecond or so during the break period, for 9600 baud. |
731 | * So dont bother disabling interrupts. | |
732 | * But dont want more than 1 break event. | |
733 | * Use a kernel timer to periodically poll the rx line until | |
734 | * the break is finished. | |
735 | */ | |
94c8b6db | 736 | static inline void sci_schedule_break_timer(struct sci_port *port) |
1da177e4 | 737 | { |
bc9b3f5c | 738 | mod_timer(&port->break_timer, jiffies + SCI_BREAK_JIFFIES); |
1da177e4 | 739 | } |
94c8b6db | 740 | |
1da177e4 LT |
741 | /* Ensure that two consecutive samples find the break over. */ |
742 | static void sci_break_timer(unsigned long data) | |
743 | { | |
e108b2ca PM |
744 | struct sci_port *port = (struct sci_port *)data; |
745 | ||
746 | if (sci_rxd_in(&port->port) == 0) { | |
1da177e4 | 747 | port->break_flag = 1; |
e108b2ca PM |
748 | sci_schedule_break_timer(port); |
749 | } else if (port->break_flag == 1) { | |
1da177e4 LT |
750 | /* break is over. */ |
751 | port->break_flag = 2; | |
e108b2ca PM |
752 | sci_schedule_break_timer(port); |
753 | } else | |
754 | port->break_flag = 0; | |
1da177e4 LT |
755 | } |
756 | ||
94c8b6db | 757 | static int sci_handle_errors(struct uart_port *port) |
1da177e4 LT |
758 | { |
759 | int copied = 0; | |
b12bb29f | 760 | unsigned short status = serial_port_in(port, SCxSR); |
92a19f9c | 761 | struct tty_port *tport = &port->state->port; |
debf9507 | 762 | struct sci_port *s = to_sci_port(port); |
1da177e4 | 763 | |
3ae988d9 LP |
764 | /* Handle overruns */ |
765 | if (status & (1 << s->overrun_bit)) { | |
766 | port->icount.overrun++; | |
d97fbbed | 767 | |
3ae988d9 LP |
768 | /* overrun error */ |
769 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN)) | |
770 | copied++; | |
762c69e3 | 771 | |
3ae988d9 | 772 | dev_notice(port->dev, "overrun error"); |
1da177e4 LT |
773 | } |
774 | ||
e108b2ca | 775 | if (status & SCxSR_FER(port)) { |
1da177e4 LT |
776 | if (sci_rxd_in(port) == 0) { |
777 | /* Notify of BREAK */ | |
e7c98dc7 | 778 | struct sci_port *sci_port = to_sci_port(port); |
e108b2ca PM |
779 | |
780 | if (!sci_port->break_flag) { | |
d97fbbed PM |
781 | port->icount.brk++; |
782 | ||
e108b2ca PM |
783 | sci_port->break_flag = 1; |
784 | sci_schedule_break_timer(sci_port); | |
785 | ||
1da177e4 | 786 | /* Do sysrq handling. */ |
e108b2ca | 787 | if (uart_handle_break(port)) |
1da177e4 | 788 | return 0; |
762c69e3 PM |
789 | |
790 | dev_dbg(port->dev, "BREAK detected\n"); | |
791 | ||
92a19f9c | 792 | if (tty_insert_flip_char(tport, 0, TTY_BREAK)) |
e7c98dc7 MT |
793 | copied++; |
794 | } | |
795 | ||
e108b2ca | 796 | } else { |
1da177e4 | 797 | /* frame error */ |
d97fbbed PM |
798 | port->icount.frame++; |
799 | ||
92a19f9c | 800 | if (tty_insert_flip_char(tport, 0, TTY_FRAME)) |
33f0f88f | 801 | copied++; |
762c69e3 PM |
802 | |
803 | dev_notice(port->dev, "frame error\n"); | |
1da177e4 LT |
804 | } |
805 | } | |
806 | ||
e108b2ca | 807 | if (status & SCxSR_PER(port)) { |
1da177e4 | 808 | /* parity error */ |
d97fbbed PM |
809 | port->icount.parity++; |
810 | ||
92a19f9c | 811 | if (tty_insert_flip_char(tport, 0, TTY_PARITY)) |
e108b2ca | 812 | copied++; |
762c69e3 PM |
813 | |
814 | dev_notice(port->dev, "parity error"); | |
1da177e4 LT |
815 | } |
816 | ||
33f0f88f | 817 | if (copied) |
2e124b4a | 818 | tty_flip_buffer_push(tport); |
1da177e4 LT |
819 | |
820 | return copied; | |
821 | } | |
822 | ||
94c8b6db | 823 | static int sci_handle_fifo_overrun(struct uart_port *port) |
d830fa45 | 824 | { |
92a19f9c | 825 | struct tty_port *tport = &port->state->port; |
debf9507 | 826 | struct sci_port *s = to_sci_port(port); |
4b8c59a3 | 827 | struct plat_sci_reg *reg; |
d830fa45 PM |
828 | int copied = 0; |
829 | ||
4b8c59a3 PM |
830 | reg = sci_getreg(port, SCLSR); |
831 | if (!reg->size) | |
d830fa45 PM |
832 | return 0; |
833 | ||
3ae988d9 | 834 | if ((serial_port_in(port, SCLSR) & (1 << s->overrun_bit))) { |
b12bb29f | 835 | serial_port_out(port, SCLSR, 0); |
d830fa45 | 836 | |
d97fbbed PM |
837 | port->icount.overrun++; |
838 | ||
92a19f9c | 839 | tty_insert_flip_char(tport, 0, TTY_OVERRUN); |
2e124b4a | 840 | tty_flip_buffer_push(tport); |
d830fa45 PM |
841 | |
842 | dev_notice(port->dev, "overrun error\n"); | |
843 | copied++; | |
844 | } | |
845 | ||
846 | return copied; | |
847 | } | |
848 | ||
94c8b6db | 849 | static int sci_handle_breaks(struct uart_port *port) |
1da177e4 LT |
850 | { |
851 | int copied = 0; | |
b12bb29f | 852 | unsigned short status = serial_port_in(port, SCxSR); |
92a19f9c | 853 | struct tty_port *tport = &port->state->port; |
a5660ada | 854 | struct sci_port *s = to_sci_port(port); |
1da177e4 | 855 | |
0b3d4ef6 PM |
856 | if (uart_handle_break(port)) |
857 | return 0; | |
858 | ||
b7a76e4b | 859 | if (!s->break_flag && status & SCxSR_BRK(port)) { |
1da177e4 LT |
860 | #if defined(CONFIG_CPU_SH3) |
861 | /* Debounce break */ | |
862 | s->break_flag = 1; | |
863 | #endif | |
d97fbbed PM |
864 | |
865 | port->icount.brk++; | |
866 | ||
1da177e4 | 867 | /* Notify of BREAK */ |
92a19f9c | 868 | if (tty_insert_flip_char(tport, 0, TTY_BREAK)) |
33f0f88f | 869 | copied++; |
762c69e3 PM |
870 | |
871 | dev_dbg(port->dev, "BREAK detected\n"); | |
1da177e4 LT |
872 | } |
873 | ||
33f0f88f | 874 | if (copied) |
2e124b4a | 875 | tty_flip_buffer_push(tport); |
e108b2ca | 876 | |
d830fa45 PM |
877 | copied += sci_handle_fifo_overrun(port); |
878 | ||
1da177e4 LT |
879 | return copied; |
880 | } | |
881 | ||
73a19e4c | 882 | static irqreturn_t sci_rx_interrupt(int irq, void *ptr) |
1da177e4 | 883 | { |
73a19e4c GL |
884 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
885 | struct uart_port *port = ptr; | |
886 | struct sci_port *s = to_sci_port(port); | |
887 | ||
888 | if (s->chan_rx) { | |
b12bb29f PM |
889 | u16 scr = serial_port_in(port, SCSCR); |
890 | u16 ssr = serial_port_in(port, SCxSR); | |
73a19e4c GL |
891 | |
892 | /* Disable future Rx interrupts */ | |
d1d4b10c | 893 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
3089f381 GL |
894 | disable_irq_nosync(irq); |
895 | scr |= 0x4000; | |
896 | } else { | |
f43dc23d | 897 | scr &= ~SCSCR_RIE; |
3089f381 | 898 | } |
b12bb29f | 899 | serial_port_out(port, SCSCR, scr); |
73a19e4c | 900 | /* Clear current interrupt */ |
b12bb29f | 901 | serial_port_out(port, SCxSR, ssr & ~(1 | SCxSR_RDxF(port))); |
3089f381 GL |
902 | dev_dbg(port->dev, "Rx IRQ %lu: setup t-out in %u jiffies\n", |
903 | jiffies, s->rx_timeout); | |
904 | mod_timer(&s->rx_timer, jiffies + s->rx_timeout); | |
73a19e4c GL |
905 | |
906 | return IRQ_HANDLED; | |
907 | } | |
908 | #endif | |
909 | ||
1da177e4 LT |
910 | /* I think sci_receive_chars has to be called irrespective |
911 | * of whether the I_IXOFF is set, otherwise, how is the interrupt | |
912 | * to be disabled? | |
913 | */ | |
73a19e4c | 914 | sci_receive_chars(ptr); |
1da177e4 LT |
915 | |
916 | return IRQ_HANDLED; | |
917 | } | |
918 | ||
7d12e780 | 919 | static irqreturn_t sci_tx_interrupt(int irq, void *ptr) |
1da177e4 LT |
920 | { |
921 | struct uart_port *port = ptr; | |
fd78a76a | 922 | unsigned long flags; |
1da177e4 | 923 | |
fd78a76a | 924 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 925 | sci_transmit_chars(port); |
fd78a76a | 926 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
927 | |
928 | return IRQ_HANDLED; | |
929 | } | |
930 | ||
7d12e780 | 931 | static irqreturn_t sci_er_interrupt(int irq, void *ptr) |
1da177e4 LT |
932 | { |
933 | struct uart_port *port = ptr; | |
934 | ||
935 | /* Handle errors */ | |
936 | if (port->type == PORT_SCI) { | |
937 | if (sci_handle_errors(port)) { | |
938 | /* discard character in rx buffer */ | |
b12bb29f PM |
939 | serial_port_in(port, SCxSR); |
940 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); | |
1da177e4 LT |
941 | } |
942 | } else { | |
d830fa45 | 943 | sci_handle_fifo_overrun(port); |
7d12e780 | 944 | sci_rx_interrupt(irq, ptr); |
1da177e4 LT |
945 | } |
946 | ||
b12bb29f | 947 | serial_port_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); |
1da177e4 LT |
948 | |
949 | /* Kick the transmission */ | |
7d12e780 | 950 | sci_tx_interrupt(irq, ptr); |
1da177e4 LT |
951 | |
952 | return IRQ_HANDLED; | |
953 | } | |
954 | ||
7d12e780 | 955 | static irqreturn_t sci_br_interrupt(int irq, void *ptr) |
1da177e4 LT |
956 | { |
957 | struct uart_port *port = ptr; | |
958 | ||
959 | /* Handle BREAKs */ | |
960 | sci_handle_breaks(port); | |
b12bb29f | 961 | serial_port_out(port, SCxSR, SCxSR_BREAK_CLEAR(port)); |
1da177e4 LT |
962 | |
963 | return IRQ_HANDLED; | |
964 | } | |
965 | ||
f43dc23d PM |
966 | static inline unsigned long port_rx_irq_mask(struct uart_port *port) |
967 | { | |
968 | /* | |
969 | * Not all ports (such as SCIFA) will support REIE. Rather than | |
970 | * special-casing the port type, we check the port initialization | |
971 | * IRQ enable mask to see whether the IRQ is desired at all. If | |
972 | * it's unset, it's logically inferred that there's no point in | |
973 | * testing for it. | |
974 | */ | |
ce6738b6 | 975 | return SCSCR_RIE | (to_sci_port(port)->cfg->scscr & SCSCR_REIE); |
f43dc23d PM |
976 | } |
977 | ||
7d12e780 | 978 | static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) |
1da177e4 | 979 | { |
44e18e9e | 980 | unsigned short ssr_status, scr_status, err_enabled; |
a8884e34 | 981 | struct uart_port *port = ptr; |
73a19e4c | 982 | struct sci_port *s = to_sci_port(port); |
a8884e34 | 983 | irqreturn_t ret = IRQ_NONE; |
1da177e4 | 984 | |
b12bb29f PM |
985 | ssr_status = serial_port_in(port, SCxSR); |
986 | scr_status = serial_port_in(port, SCSCR); | |
f43dc23d | 987 | err_enabled = scr_status & port_rx_irq_mask(port); |
1da177e4 LT |
988 | |
989 | /* Tx Interrupt */ | |
f43dc23d | 990 | if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCSCR_TIE) && |
73a19e4c | 991 | !s->chan_tx) |
a8884e34 | 992 | ret = sci_tx_interrupt(irq, ptr); |
f43dc23d | 993 | |
73a19e4c GL |
994 | /* |
995 | * Rx Interrupt: if we're using DMA, the DMA controller clears RDF / | |
996 | * DR flags | |
997 | */ | |
998 | if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) && | |
f43dc23d | 999 | (scr_status & SCSCR_RIE)) |
a8884e34 | 1000 | ret = sci_rx_interrupt(irq, ptr); |
f43dc23d | 1001 | |
1da177e4 | 1002 | /* Error Interrupt */ |
dd4da3a5 | 1003 | if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled) |
a8884e34 | 1004 | ret = sci_er_interrupt(irq, ptr); |
f43dc23d | 1005 | |
1da177e4 | 1006 | /* Break Interrupt */ |
dd4da3a5 | 1007 | if ((ssr_status & SCxSR_BRK(port)) && err_enabled) |
a8884e34 | 1008 | ret = sci_br_interrupt(irq, ptr); |
1da177e4 | 1009 | |
a8884e34 | 1010 | return ret; |
1da177e4 LT |
1011 | } |
1012 | ||
1da177e4 | 1013 | /* |
25985edc | 1014 | * Here we define a transition notifier so that we can update all of our |
1da177e4 LT |
1015 | * ports' baud rate when the peripheral clock changes. |
1016 | */ | |
e108b2ca PM |
1017 | static int sci_notifier(struct notifier_block *self, |
1018 | unsigned long phase, void *p) | |
1da177e4 | 1019 | { |
e552de24 MD |
1020 | struct sci_port *sci_port; |
1021 | unsigned long flags; | |
1da177e4 | 1022 | |
d535a230 PM |
1023 | sci_port = container_of(self, struct sci_port, freq_transition); |
1024 | ||
1da177e4 | 1025 | if ((phase == CPUFREQ_POSTCHANGE) || |
e552de24 | 1026 | (phase == CPUFREQ_RESUMECHANGE)) { |
d535a230 | 1027 | struct uart_port *port = &sci_port->port; |
073e84c9 | 1028 | |
d535a230 PM |
1029 | spin_lock_irqsave(&port->lock, flags); |
1030 | port->uartclk = clk_get_rate(sci_port->iclk); | |
1031 | spin_unlock_irqrestore(&port->lock, flags); | |
e552de24 | 1032 | } |
1da177e4 | 1033 | |
1da177e4 LT |
1034 | return NOTIFY_OK; |
1035 | } | |
501b825d | 1036 | |
9174fc8f PM |
1037 | static struct sci_irq_desc { |
1038 | const char *desc; | |
1039 | irq_handler_t handler; | |
1040 | } sci_irq_desc[] = { | |
1041 | /* | |
1042 | * Split out handlers, the default case. | |
1043 | */ | |
1044 | [SCIx_ERI_IRQ] = { | |
1045 | .desc = "rx err", | |
1046 | .handler = sci_er_interrupt, | |
1047 | }, | |
1048 | ||
1049 | [SCIx_RXI_IRQ] = { | |
1050 | .desc = "rx full", | |
1051 | .handler = sci_rx_interrupt, | |
1052 | }, | |
1053 | ||
1054 | [SCIx_TXI_IRQ] = { | |
1055 | .desc = "tx empty", | |
1056 | .handler = sci_tx_interrupt, | |
1057 | }, | |
1058 | ||
1059 | [SCIx_BRI_IRQ] = { | |
1060 | .desc = "break", | |
1061 | .handler = sci_br_interrupt, | |
1062 | }, | |
1063 | ||
1064 | /* | |
1065 | * Special muxed handler. | |
1066 | */ | |
1067 | [SCIx_MUX_IRQ] = { | |
1068 | .desc = "mux", | |
1069 | .handler = sci_mpxed_interrupt, | |
1070 | }, | |
1071 | }; | |
1072 | ||
1da177e4 LT |
1073 | static int sci_request_irq(struct sci_port *port) |
1074 | { | |
9174fc8f PM |
1075 | struct uart_port *up = &port->port; |
1076 | int i, j, ret = 0; | |
1077 | ||
1078 | for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) { | |
1079 | struct sci_irq_desc *desc; | |
1fcc91a6 | 1080 | int irq; |
9174fc8f PM |
1081 | |
1082 | if (SCIx_IRQ_IS_MUXED(port)) { | |
1083 | i = SCIx_MUX_IRQ; | |
1084 | irq = up->irq; | |
0e8963de | 1085 | } else { |
1fcc91a6 | 1086 | irq = port->irqs[i]; |
9174fc8f | 1087 | |
0e8963de PM |
1088 | /* |
1089 | * Certain port types won't support all of the | |
1090 | * available interrupt sources. | |
1091 | */ | |
1fcc91a6 | 1092 | if (unlikely(irq < 0)) |
0e8963de PM |
1093 | continue; |
1094 | } | |
1095 | ||
9174fc8f PM |
1096 | desc = sci_irq_desc + i; |
1097 | port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s", | |
1098 | dev_name(up->dev), desc->desc); | |
1099 | if (!port->irqstr[j]) { | |
1100 | dev_err(up->dev, "Failed to allocate %s IRQ string\n", | |
1101 | desc->desc); | |
1102 | goto out_nomem; | |
1da177e4 | 1103 | } |
9174fc8f PM |
1104 | |
1105 | ret = request_irq(irq, desc->handler, up->irqflags, | |
1106 | port->irqstr[j], port); | |
1107 | if (unlikely(ret)) { | |
1108 | dev_err(up->dev, "Can't allocate %s IRQ\n", desc->desc); | |
1109 | goto out_noirq; | |
1da177e4 LT |
1110 | } |
1111 | } | |
1112 | ||
1113 | return 0; | |
9174fc8f PM |
1114 | |
1115 | out_noirq: | |
1116 | while (--i >= 0) | |
1fcc91a6 | 1117 | free_irq(port->irqs[i], port); |
9174fc8f PM |
1118 | |
1119 | out_nomem: | |
1120 | while (--j >= 0) | |
1121 | kfree(port->irqstr[j]); | |
1122 | ||
1123 | return ret; | |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | static void sci_free_irq(struct sci_port *port) | |
1127 | { | |
1128 | int i; | |
1129 | ||
9174fc8f PM |
1130 | /* |
1131 | * Intentionally in reverse order so we iterate over the muxed | |
1132 | * IRQ first. | |
1133 | */ | |
1134 | for (i = 0; i < SCIx_NR_IRQS; i++) { | |
1fcc91a6 | 1135 | int irq = port->irqs[i]; |
0e8963de PM |
1136 | |
1137 | /* | |
1138 | * Certain port types won't support all of the available | |
1139 | * interrupt sources. | |
1140 | */ | |
1fcc91a6 | 1141 | if (unlikely(irq < 0)) |
0e8963de PM |
1142 | continue; |
1143 | ||
1fcc91a6 | 1144 | free_irq(port->irqs[i], port); |
9174fc8f | 1145 | kfree(port->irqstr[i]); |
1da177e4 | 1146 | |
9174fc8f PM |
1147 | if (SCIx_IRQ_IS_MUXED(port)) { |
1148 | /* If there's only one IRQ, we're done. */ | |
1149 | return; | |
1da177e4 LT |
1150 | } |
1151 | } | |
1152 | } | |
1153 | ||
1154 | static unsigned int sci_tx_empty(struct uart_port *port) | |
1155 | { | |
b12bb29f | 1156 | unsigned short status = serial_port_in(port, SCxSR); |
72b294cf | 1157 | unsigned short in_tx_fifo = sci_txfill(port); |
73a19e4c GL |
1158 | |
1159 | return (status & SCxSR_TEND(port)) && !in_tx_fifo ? TIOCSER_TEMT : 0; | |
1da177e4 LT |
1160 | } |
1161 | ||
cdf7c42f PM |
1162 | /* |
1163 | * Modem control is a bit of a mixed bag for SCI(F) ports. Generally | |
1164 | * CTS/RTS is supported in hardware by at least one port and controlled | |
1165 | * via SCSPTR (SCxPCR for SCIFA/B parts), or external pins (presently | |
1166 | * handled via the ->init_pins() op, which is a bit of a one-way street, | |
1167 | * lacking any ability to defer pin control -- this will later be | |
1168 | * converted over to the GPIO framework). | |
dc7e3ef7 PM |
1169 | * |
1170 | * Other modes (such as loopback) are supported generically on certain | |
1171 | * port types, but not others. For these it's sufficient to test for the | |
1172 | * existence of the support register and simply ignore the port type. | |
cdf7c42f | 1173 | */ |
1da177e4 LT |
1174 | static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl) |
1175 | { | |
dc7e3ef7 PM |
1176 | if (mctrl & TIOCM_LOOP) { |
1177 | struct plat_sci_reg *reg; | |
1178 | ||
1179 | /* | |
1180 | * Standard loopback mode for SCFCR ports. | |
1181 | */ | |
1182 | reg = sci_getreg(port, SCFCR); | |
1183 | if (reg->size) | |
b12bb29f | 1184 | serial_port_out(port, SCFCR, serial_port_in(port, SCFCR) | 1); |
dc7e3ef7 | 1185 | } |
1da177e4 LT |
1186 | } |
1187 | ||
1188 | static unsigned int sci_get_mctrl(struct uart_port *port) | |
1189 | { | |
cdf7c42f PM |
1190 | /* |
1191 | * CTS/RTS is handled in hardware when supported, while nothing | |
1192 | * else is wired up. Keep it simple and simply assert DSR/CAR. | |
1193 | */ | |
1194 | return TIOCM_DSR | TIOCM_CAR; | |
1da177e4 LT |
1195 | } |
1196 | ||
73a19e4c GL |
1197 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
1198 | static void sci_dma_tx_complete(void *arg) | |
1199 | { | |
1200 | struct sci_port *s = arg; | |
1201 | struct uart_port *port = &s->port; | |
1202 | struct circ_buf *xmit = &port->state->xmit; | |
1203 | unsigned long flags; | |
1204 | ||
1205 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); | |
1206 | ||
1207 | spin_lock_irqsave(&port->lock, flags); | |
1208 | ||
f354a381 | 1209 | xmit->tail += sg_dma_len(&s->sg_tx); |
73a19e4c GL |
1210 | xmit->tail &= UART_XMIT_SIZE - 1; |
1211 | ||
f354a381 | 1212 | port->icount.tx += sg_dma_len(&s->sg_tx); |
73a19e4c GL |
1213 | |
1214 | async_tx_ack(s->desc_tx); | |
73a19e4c GL |
1215 | s->desc_tx = NULL; |
1216 | ||
73a19e4c GL |
1217 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
1218 | uart_write_wakeup(port); | |
1219 | ||
3089f381 | 1220 | if (!uart_circ_empty(xmit)) { |
49d4bcad | 1221 | s->cookie_tx = 0; |
73a19e4c | 1222 | schedule_work(&s->work_tx); |
49d4bcad YT |
1223 | } else { |
1224 | s->cookie_tx = -EINVAL; | |
1225 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
b12bb29f PM |
1226 | u16 ctrl = serial_port_in(port, SCSCR); |
1227 | serial_port_out(port, SCSCR, ctrl & ~SCSCR_TIE); | |
49d4bcad | 1228 | } |
3089f381 GL |
1229 | } |
1230 | ||
1231 | spin_unlock_irqrestore(&port->lock, flags); | |
73a19e4c GL |
1232 | } |
1233 | ||
1234 | /* Locking: called with port lock held */ | |
92a19f9c | 1235 | static int sci_dma_rx_push(struct sci_port *s, size_t count) |
73a19e4c GL |
1236 | { |
1237 | struct uart_port *port = &s->port; | |
227434f8 | 1238 | struct tty_port *tport = &port->state->port; |
73a19e4c GL |
1239 | int i, active, room; |
1240 | ||
227434f8 | 1241 | room = tty_buffer_request_room(tport, count); |
73a19e4c GL |
1242 | |
1243 | if (s->active_rx == s->cookie_rx[0]) { | |
1244 | active = 0; | |
1245 | } else if (s->active_rx == s->cookie_rx[1]) { | |
1246 | active = 1; | |
1247 | } else { | |
1248 | dev_err(port->dev, "cookie %d not found!\n", s->active_rx); | |
1249 | return 0; | |
1250 | } | |
1251 | ||
1252 | if (room < count) | |
e2afca69 | 1253 | dev_warn(port->dev, "Rx overrun: dropping %zu bytes\n", |
73a19e4c GL |
1254 | count - room); |
1255 | if (!room) | |
1256 | return room; | |
1257 | ||
1258 | for (i = 0; i < room; i++) | |
92a19f9c | 1259 | tty_insert_flip_char(tport, ((u8 *)sg_virt(&s->sg_rx[active]))[i], |
73a19e4c GL |
1260 | TTY_NORMAL); |
1261 | ||
1262 | port->icount.rx += room; | |
1263 | ||
1264 | return room; | |
1265 | } | |
1266 | ||
1267 | static void sci_dma_rx_complete(void *arg) | |
1268 | { | |
1269 | struct sci_port *s = arg; | |
1270 | struct uart_port *port = &s->port; | |
73a19e4c GL |
1271 | unsigned long flags; |
1272 | int count; | |
1273 | ||
3089f381 | 1274 | dev_dbg(port->dev, "%s(%d) active #%d\n", __func__, port->line, s->active_rx); |
73a19e4c GL |
1275 | |
1276 | spin_lock_irqsave(&port->lock, flags); | |
1277 | ||
92a19f9c | 1278 | count = sci_dma_rx_push(s, s->buf_len_rx); |
73a19e4c | 1279 | |
3089f381 | 1280 | mod_timer(&s->rx_timer, jiffies + s->rx_timeout); |
73a19e4c GL |
1281 | |
1282 | spin_unlock_irqrestore(&port->lock, flags); | |
1283 | ||
1284 | if (count) | |
2e124b4a | 1285 | tty_flip_buffer_push(&port->state->port); |
73a19e4c GL |
1286 | |
1287 | schedule_work(&s->work_rx); | |
1288 | } | |
1289 | ||
73a19e4c GL |
1290 | static void sci_rx_dma_release(struct sci_port *s, bool enable_pio) |
1291 | { | |
1292 | struct dma_chan *chan = s->chan_rx; | |
1293 | struct uart_port *port = &s->port; | |
73a19e4c GL |
1294 | |
1295 | s->chan_rx = NULL; | |
1296 | s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL; | |
1297 | dma_release_channel(chan); | |
85b8e3ff GL |
1298 | if (sg_dma_address(&s->sg_rx[0])) |
1299 | dma_free_coherent(port->dev, s->buf_len_rx * 2, | |
1300 | sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0])); | |
73a19e4c GL |
1301 | if (enable_pio) |
1302 | sci_start_rx(port); | |
1303 | } | |
1304 | ||
1305 | static void sci_tx_dma_release(struct sci_port *s, bool enable_pio) | |
1306 | { | |
1307 | struct dma_chan *chan = s->chan_tx; | |
1308 | struct uart_port *port = &s->port; | |
73a19e4c GL |
1309 | |
1310 | s->chan_tx = NULL; | |
1311 | s->cookie_tx = -EINVAL; | |
1312 | dma_release_channel(chan); | |
1313 | if (enable_pio) | |
1314 | sci_start_tx(port); | |
1315 | } | |
1316 | ||
1317 | static void sci_submit_rx(struct sci_port *s) | |
1318 | { | |
1319 | struct dma_chan *chan = s->chan_rx; | |
1320 | int i; | |
1321 | ||
1322 | for (i = 0; i < 2; i++) { | |
1323 | struct scatterlist *sg = &s->sg_rx[i]; | |
1324 | struct dma_async_tx_descriptor *desc; | |
1325 | ||
16052827 | 1326 | desc = dmaengine_prep_slave_sg(chan, |
a485df4b | 1327 | sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); |
73a19e4c GL |
1328 | |
1329 | if (desc) { | |
1330 | s->desc_rx[i] = desc; | |
1331 | desc->callback = sci_dma_rx_complete; | |
1332 | desc->callback_param = s; | |
1333 | s->cookie_rx[i] = desc->tx_submit(desc); | |
1334 | } | |
1335 | ||
1336 | if (!desc || s->cookie_rx[i] < 0) { | |
1337 | if (i) { | |
1338 | async_tx_ack(s->desc_rx[0]); | |
1339 | s->cookie_rx[0] = -EINVAL; | |
1340 | } | |
1341 | if (desc) { | |
1342 | async_tx_ack(desc); | |
1343 | s->cookie_rx[i] = -EINVAL; | |
1344 | } | |
1345 | dev_warn(s->port.dev, | |
1346 | "failed to re-start DMA, using PIO\n"); | |
1347 | sci_rx_dma_release(s, true); | |
1348 | return; | |
1349 | } | |
3089f381 GL |
1350 | dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n", __func__, |
1351 | s->cookie_rx[i], i); | |
73a19e4c GL |
1352 | } |
1353 | ||
1354 | s->active_rx = s->cookie_rx[0]; | |
1355 | ||
1356 | dma_async_issue_pending(chan); | |
1357 | } | |
1358 | ||
1359 | static void work_fn_rx(struct work_struct *work) | |
1360 | { | |
1361 | struct sci_port *s = container_of(work, struct sci_port, work_rx); | |
1362 | struct uart_port *port = &s->port; | |
1363 | struct dma_async_tx_descriptor *desc; | |
1364 | int new; | |
1365 | ||
1366 | if (s->active_rx == s->cookie_rx[0]) { | |
1367 | new = 0; | |
1368 | } else if (s->active_rx == s->cookie_rx[1]) { | |
1369 | new = 1; | |
1370 | } else { | |
1371 | dev_err(port->dev, "cookie %d not found!\n", s->active_rx); | |
1372 | return; | |
1373 | } | |
1374 | desc = s->desc_rx[new]; | |
1375 | ||
1376 | if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) != | |
0b3d7d39 | 1377 | DMA_COMPLETE) { |
73a19e4c | 1378 | /* Handle incomplete DMA receive */ |
73a19e4c | 1379 | struct dma_chan *chan = s->chan_rx; |
4dc4c516 GL |
1380 | struct shdma_desc *sh_desc = container_of(desc, |
1381 | struct shdma_desc, async_tx); | |
73a19e4c GL |
1382 | unsigned long flags; |
1383 | int count; | |
1384 | ||
05827630 | 1385 | chan->device->device_control(chan, DMA_TERMINATE_ALL, 0); |
e2afca69 | 1386 | dev_dbg(port->dev, "Read %zu bytes with cookie %d\n", |
73a19e4c GL |
1387 | sh_desc->partial, sh_desc->cookie); |
1388 | ||
1389 | spin_lock_irqsave(&port->lock, flags); | |
92a19f9c | 1390 | count = sci_dma_rx_push(s, sh_desc->partial); |
73a19e4c GL |
1391 | spin_unlock_irqrestore(&port->lock, flags); |
1392 | ||
1393 | if (count) | |
2e124b4a | 1394 | tty_flip_buffer_push(&port->state->port); |
73a19e4c GL |
1395 | |
1396 | sci_submit_rx(s); | |
1397 | ||
1398 | return; | |
1399 | } | |
1400 | ||
1401 | s->cookie_rx[new] = desc->tx_submit(desc); | |
1402 | if (s->cookie_rx[new] < 0) { | |
1403 | dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n"); | |
1404 | sci_rx_dma_release(s, true); | |
1405 | return; | |
1406 | } | |
1407 | ||
73a19e4c | 1408 | s->active_rx = s->cookie_rx[!new]; |
3089f381 GL |
1409 | |
1410 | dev_dbg(port->dev, "%s: cookie %d #%d, new active #%d\n", __func__, | |
1411 | s->cookie_rx[new], new, s->active_rx); | |
73a19e4c GL |
1412 | } |
1413 | ||
1414 | static void work_fn_tx(struct work_struct *work) | |
1415 | { | |
1416 | struct sci_port *s = container_of(work, struct sci_port, work_tx); | |
1417 | struct dma_async_tx_descriptor *desc; | |
1418 | struct dma_chan *chan = s->chan_tx; | |
1419 | struct uart_port *port = &s->port; | |
1420 | struct circ_buf *xmit = &port->state->xmit; | |
1421 | struct scatterlist *sg = &s->sg_tx; | |
1422 | ||
1423 | /* | |
1424 | * DMA is idle now. | |
1425 | * Port xmit buffer is already mapped, and it is one page... Just adjust | |
1426 | * offsets and lengths. Since it is a circular buffer, we have to | |
1427 | * transmit till the end, and then the rest. Take the port lock to get a | |
1428 | * consistent xmit buffer state. | |
1429 | */ | |
1430 | spin_lock_irq(&port->lock); | |
1431 | sg->offset = xmit->tail & (UART_XMIT_SIZE - 1); | |
f354a381 | 1432 | sg_dma_address(sg) = (sg_dma_address(sg) & ~(UART_XMIT_SIZE - 1)) + |
73a19e4c | 1433 | sg->offset; |
f354a381 | 1434 | sg_dma_len(sg) = min((int)CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE), |
73a19e4c | 1435 | CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE)); |
73a19e4c GL |
1436 | spin_unlock_irq(&port->lock); |
1437 | ||
f354a381 | 1438 | BUG_ON(!sg_dma_len(sg)); |
73a19e4c | 1439 | |
16052827 | 1440 | desc = dmaengine_prep_slave_sg(chan, |
a485df4b | 1441 | sg, s->sg_len_tx, DMA_MEM_TO_DEV, |
73a19e4c GL |
1442 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1443 | if (!desc) { | |
1444 | /* switch to PIO */ | |
1445 | sci_tx_dma_release(s, true); | |
1446 | return; | |
1447 | } | |
1448 | ||
1449 | dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE); | |
1450 | ||
1451 | spin_lock_irq(&port->lock); | |
1452 | s->desc_tx = desc; | |
1453 | desc->callback = sci_dma_tx_complete; | |
1454 | desc->callback_param = s; | |
1455 | spin_unlock_irq(&port->lock); | |
1456 | s->cookie_tx = desc->tx_submit(desc); | |
1457 | if (s->cookie_tx < 0) { | |
1458 | dev_warn(port->dev, "Failed submitting Tx DMA descriptor\n"); | |
1459 | /* switch to PIO */ | |
1460 | sci_tx_dma_release(s, true); | |
1461 | return; | |
1462 | } | |
1463 | ||
1464 | dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", __func__, | |
1465 | xmit->buf, xmit->tail, xmit->head, s->cookie_tx); | |
1466 | ||
1467 | dma_async_issue_pending(chan); | |
1468 | } | |
1469 | #endif | |
1470 | ||
b129a8cc | 1471 | static void sci_start_tx(struct uart_port *port) |
1da177e4 | 1472 | { |
3089f381 | 1473 | struct sci_port *s = to_sci_port(port); |
e108b2ca | 1474 | unsigned short ctrl; |
1da177e4 | 1475 | |
73a19e4c | 1476 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
d1d4b10c | 1477 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
b12bb29f | 1478 | u16 new, scr = serial_port_in(port, SCSCR); |
3089f381 GL |
1479 | if (s->chan_tx) |
1480 | new = scr | 0x8000; | |
1481 | else | |
1482 | new = scr & ~0x8000; | |
1483 | if (new != scr) | |
b12bb29f | 1484 | serial_port_out(port, SCSCR, new); |
73a19e4c | 1485 | } |
f43dc23d | 1486 | |
3089f381 | 1487 | if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) && |
49d4bcad YT |
1488 | s->cookie_tx < 0) { |
1489 | s->cookie_tx = 0; | |
3089f381 | 1490 | schedule_work(&s->work_tx); |
49d4bcad | 1491 | } |
73a19e4c | 1492 | #endif |
f43dc23d | 1493 | |
d1d4b10c | 1494 | if (!s->chan_tx || port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
3089f381 | 1495 | /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */ |
b12bb29f PM |
1496 | ctrl = serial_port_in(port, SCSCR); |
1497 | serial_port_out(port, SCSCR, ctrl | SCSCR_TIE); | |
3089f381 | 1498 | } |
1da177e4 LT |
1499 | } |
1500 | ||
b129a8cc | 1501 | static void sci_stop_tx(struct uart_port *port) |
1da177e4 | 1502 | { |
1da177e4 LT |
1503 | unsigned short ctrl; |
1504 | ||
1505 | /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */ | |
b12bb29f | 1506 | ctrl = serial_port_in(port, SCSCR); |
f43dc23d | 1507 | |
d1d4b10c | 1508 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
3089f381 | 1509 | ctrl &= ~0x8000; |
f43dc23d | 1510 | |
8e698614 | 1511 | ctrl &= ~SCSCR_TIE; |
f43dc23d | 1512 | |
b12bb29f | 1513 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
1514 | } |
1515 | ||
73a19e4c | 1516 | static void sci_start_rx(struct uart_port *port) |
1da177e4 | 1517 | { |
1da177e4 LT |
1518 | unsigned short ctrl; |
1519 | ||
b12bb29f | 1520 | ctrl = serial_port_in(port, SCSCR) | port_rx_irq_mask(port); |
1da177e4 | 1521 | |
d1d4b10c | 1522 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
3089f381 | 1523 | ctrl &= ~0x4000; |
f43dc23d | 1524 | |
b12bb29f | 1525 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
1526 | } |
1527 | ||
1528 | static void sci_stop_rx(struct uart_port *port) | |
1529 | { | |
1da177e4 LT |
1530 | unsigned short ctrl; |
1531 | ||
b12bb29f | 1532 | ctrl = serial_port_in(port, SCSCR); |
f43dc23d | 1533 | |
d1d4b10c | 1534 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
3089f381 | 1535 | ctrl &= ~0x4000; |
f43dc23d PM |
1536 | |
1537 | ctrl &= ~port_rx_irq_mask(port); | |
1538 | ||
b12bb29f | 1539 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
1540 | } |
1541 | ||
1542 | static void sci_enable_ms(struct uart_port *port) | |
1543 | { | |
d39ec6ce PM |
1544 | /* |
1545 | * Not supported by hardware, always a nop. | |
1546 | */ | |
1da177e4 LT |
1547 | } |
1548 | ||
1549 | static void sci_break_ctl(struct uart_port *port, int break_state) | |
1550 | { | |
bbb4ce50 | 1551 | struct sci_port *s = to_sci_port(port); |
a4e02f6d | 1552 | struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR; |
bbb4ce50 SY |
1553 | unsigned short scscr, scsptr; |
1554 | ||
a4e02f6d SY |
1555 | /* check wheter the port has SCSPTR */ |
1556 | if (!reg->size) { | |
bbb4ce50 SY |
1557 | /* |
1558 | * Not supported by hardware. Most parts couple break and rx | |
1559 | * interrupts together, with break detection always enabled. | |
1560 | */ | |
a4e02f6d | 1561 | return; |
bbb4ce50 | 1562 | } |
a4e02f6d SY |
1563 | |
1564 | scsptr = serial_port_in(port, SCSPTR); | |
1565 | scscr = serial_port_in(port, SCSCR); | |
1566 | ||
1567 | if (break_state == -1) { | |
1568 | scsptr = (scsptr | SCSPTR_SPB2IO) & ~SCSPTR_SPB2DT; | |
1569 | scscr &= ~SCSCR_TE; | |
1570 | } else { | |
1571 | scsptr = (scsptr | SCSPTR_SPB2DT) & ~SCSPTR_SPB2IO; | |
1572 | scscr |= SCSCR_TE; | |
1573 | } | |
1574 | ||
1575 | serial_port_out(port, SCSPTR, scsptr); | |
1576 | serial_port_out(port, SCSCR, scscr); | |
1da177e4 LT |
1577 | } |
1578 | ||
73a19e4c GL |
1579 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
1580 | static bool filter(struct dma_chan *chan, void *slave) | |
1581 | { | |
1582 | struct sh_dmae_slave *param = slave; | |
1583 | ||
1584 | dev_dbg(chan->device->dev, "%s: slave ID %d\n", __func__, | |
d6fa5a4e | 1585 | param->shdma_slave.slave_id); |
73a19e4c | 1586 | |
d6fa5a4e | 1587 | chan->private = ¶m->shdma_slave; |
937bb6e4 | 1588 | return true; |
73a19e4c GL |
1589 | } |
1590 | ||
1591 | static void rx_timer_fn(unsigned long arg) | |
1592 | { | |
1593 | struct sci_port *s = (struct sci_port *)arg; | |
1594 | struct uart_port *port = &s->port; | |
b12bb29f | 1595 | u16 scr = serial_port_in(port, SCSCR); |
3089f381 | 1596 | |
d1d4b10c | 1597 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
3089f381 | 1598 | scr &= ~0x4000; |
1fcc91a6 | 1599 | enable_irq(s->irqs[SCIx_RXI_IRQ]); |
3089f381 | 1600 | } |
b12bb29f | 1601 | serial_port_out(port, SCSCR, scr | SCSCR_RIE); |
73a19e4c GL |
1602 | dev_dbg(port->dev, "DMA Rx timed out\n"); |
1603 | schedule_work(&s->work_rx); | |
1604 | } | |
1605 | ||
1606 | static void sci_request_dma(struct uart_port *port) | |
1607 | { | |
1608 | struct sci_port *s = to_sci_port(port); | |
1609 | struct sh_dmae_slave *param; | |
1610 | struct dma_chan *chan; | |
1611 | dma_cap_mask_t mask; | |
1612 | int nent; | |
1613 | ||
937bb6e4 GL |
1614 | dev_dbg(port->dev, "%s: port %d\n", __func__, |
1615 | port->line); | |
73a19e4c | 1616 | |
937bb6e4 | 1617 | if (s->cfg->dma_slave_tx <= 0 || s->cfg->dma_slave_rx <= 0) |
73a19e4c GL |
1618 | return; |
1619 | ||
1620 | dma_cap_zero(mask); | |
1621 | dma_cap_set(DMA_SLAVE, mask); | |
1622 | ||
1623 | param = &s->param_tx; | |
1624 | ||
1625 | /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */ | |
d6fa5a4e | 1626 | param->shdma_slave.slave_id = s->cfg->dma_slave_tx; |
73a19e4c GL |
1627 | |
1628 | s->cookie_tx = -EINVAL; | |
1629 | chan = dma_request_channel(mask, filter, param); | |
1630 | dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan); | |
1631 | if (chan) { | |
1632 | s->chan_tx = chan; | |
1633 | sg_init_table(&s->sg_tx, 1); | |
1634 | /* UART circular tx buffer is an aligned page. */ | |
e2afca69 | 1635 | BUG_ON((uintptr_t)port->state->xmit.buf & ~PAGE_MASK); |
73a19e4c | 1636 | sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf), |
e2afca69 LP |
1637 | UART_XMIT_SIZE, |
1638 | (uintptr_t)port->state->xmit.buf & ~PAGE_MASK); | |
73a19e4c GL |
1639 | nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE); |
1640 | if (!nent) | |
1641 | sci_tx_dma_release(s, false); | |
1642 | else | |
e2afca69 LP |
1643 | dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__, |
1644 | sg_dma_len(&s->sg_tx), port->state->xmit.buf, | |
1645 | &sg_dma_address(&s->sg_tx)); | |
73a19e4c GL |
1646 | |
1647 | s->sg_len_tx = nent; | |
1648 | ||
1649 | INIT_WORK(&s->work_tx, work_fn_tx); | |
1650 | } | |
1651 | ||
1652 | param = &s->param_rx; | |
1653 | ||
1654 | /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */ | |
d6fa5a4e | 1655 | param->shdma_slave.slave_id = s->cfg->dma_slave_rx; |
73a19e4c GL |
1656 | |
1657 | chan = dma_request_channel(mask, filter, param); | |
1658 | dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan); | |
1659 | if (chan) { | |
1660 | dma_addr_t dma[2]; | |
1661 | void *buf[2]; | |
1662 | int i; | |
1663 | ||
1664 | s->chan_rx = chan; | |
1665 | ||
1666 | s->buf_len_rx = 2 * max(16, (int)port->fifosize); | |
1667 | buf[0] = dma_alloc_coherent(port->dev, s->buf_len_rx * 2, | |
1668 | &dma[0], GFP_KERNEL); | |
1669 | ||
1670 | if (!buf[0]) { | |
1671 | dev_warn(port->dev, | |
1672 | "failed to allocate dma buffer, using PIO\n"); | |
1673 | sci_rx_dma_release(s, true); | |
1674 | return; | |
1675 | } | |
1676 | ||
1677 | buf[1] = buf[0] + s->buf_len_rx; | |
1678 | dma[1] = dma[0] + s->buf_len_rx; | |
1679 | ||
1680 | for (i = 0; i < 2; i++) { | |
1681 | struct scatterlist *sg = &s->sg_rx[i]; | |
1682 | ||
1683 | sg_init_table(sg, 1); | |
1684 | sg_set_page(sg, virt_to_page(buf[i]), s->buf_len_rx, | |
e2afca69 | 1685 | (uintptr_t)buf[i] & ~PAGE_MASK); |
f354a381 | 1686 | sg_dma_address(sg) = dma[i]; |
73a19e4c GL |
1687 | } |
1688 | ||
1689 | INIT_WORK(&s->work_rx, work_fn_rx); | |
1690 | setup_timer(&s->rx_timer, rx_timer_fn, (unsigned long)s); | |
1691 | ||
1692 | sci_submit_rx(s); | |
1693 | } | |
1694 | } | |
1695 | ||
1696 | static void sci_free_dma(struct uart_port *port) | |
1697 | { | |
1698 | struct sci_port *s = to_sci_port(port); | |
1699 | ||
73a19e4c GL |
1700 | if (s->chan_tx) |
1701 | sci_tx_dma_release(s, false); | |
1702 | if (s->chan_rx) | |
1703 | sci_rx_dma_release(s, false); | |
1704 | } | |
27bd1075 PM |
1705 | #else |
1706 | static inline void sci_request_dma(struct uart_port *port) | |
1707 | { | |
1708 | } | |
1709 | ||
1710 | static inline void sci_free_dma(struct uart_port *port) | |
1711 | { | |
1712 | } | |
73a19e4c GL |
1713 | #endif |
1714 | ||
1da177e4 LT |
1715 | static int sci_startup(struct uart_port *port) |
1716 | { | |
a5660ada | 1717 | struct sci_port *s = to_sci_port(port); |
33b48e16 | 1718 | unsigned long flags; |
073e84c9 | 1719 | int ret; |
1da177e4 | 1720 | |
73a19e4c GL |
1721 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
1722 | ||
073e84c9 PM |
1723 | ret = sci_request_irq(s); |
1724 | if (unlikely(ret < 0)) | |
1725 | return ret; | |
1726 | ||
73a19e4c | 1727 | sci_request_dma(port); |
073e84c9 | 1728 | |
33b48e16 | 1729 | spin_lock_irqsave(&port->lock, flags); |
d656901b | 1730 | sci_start_tx(port); |
73a19e4c | 1731 | sci_start_rx(port); |
33b48e16 | 1732 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
1733 | |
1734 | return 0; | |
1735 | } | |
1736 | ||
1737 | static void sci_shutdown(struct uart_port *port) | |
1738 | { | |
a5660ada | 1739 | struct sci_port *s = to_sci_port(port); |
33b48e16 | 1740 | unsigned long flags; |
1da177e4 | 1741 | |
73a19e4c GL |
1742 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
1743 | ||
33b48e16 | 1744 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 1745 | sci_stop_rx(port); |
b129a8cc | 1746 | sci_stop_tx(port); |
33b48e16 | 1747 | spin_unlock_irqrestore(&port->lock, flags); |
073e84c9 | 1748 | |
73a19e4c | 1749 | sci_free_dma(port); |
1da177e4 | 1750 | sci_free_irq(s); |
1da177e4 LT |
1751 | } |
1752 | ||
26c92f37 PM |
1753 | static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps, |
1754 | unsigned long freq) | |
1755 | { | |
1756 | switch (algo_id) { | |
1757 | case SCBRR_ALGO_1: | |
6557b1f6 | 1758 | return freq / (16 * bps); |
26c92f37 | 1759 | case SCBRR_ALGO_2: |
6557b1f6 | 1760 | return DIV_ROUND_CLOSEST(freq, 32 * bps) - 1; |
26c92f37 | 1761 | case SCBRR_ALGO_3: |
6557b1f6 | 1762 | return freq / (8 * bps); |
26c92f37 | 1763 | case SCBRR_ALGO_4: |
6557b1f6 | 1764 | return DIV_ROUND_CLOSEST(freq, 16 * bps) - 1; |
26c92f37 PM |
1765 | } |
1766 | ||
1767 | /* Warn, but use a safe default */ | |
1768 | WARN_ON(1); | |
e8183a6c | 1769 | |
26c92f37 PM |
1770 | return ((freq + 16 * bps) / (32 * bps) - 1); |
1771 | } | |
1772 | ||
f303b364 UH |
1773 | /* calculate sample rate, BRR, and clock select for HSCIF */ |
1774 | static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq, | |
1775 | int *brr, unsigned int *srr, | |
1776 | unsigned int *cks) | |
1777 | { | |
1778 | int sr, c, br, err; | |
1779 | int min_err = 1000; /* 100% */ | |
1780 | ||
1781 | /* Find the combination of sample rate and clock select with the | |
1782 | smallest deviation from the desired baud rate. */ | |
1783 | for (sr = 8; sr <= 32; sr++) { | |
1784 | for (c = 0; c <= 3; c++) { | |
1785 | /* integerized formulas from HSCIF documentation */ | |
1786 | br = freq / (sr * (1 << (2 * c + 1)) * bps) - 1; | |
1787 | if (br < 0 || br > 255) | |
1788 | continue; | |
1789 | err = freq / ((br + 1) * bps * sr * | |
1790 | (1 << (2 * c + 1)) / 1000) - 1000; | |
1791 | if (min_err > err) { | |
1792 | min_err = err; | |
1793 | *brr = br; | |
1794 | *srr = sr - 1; | |
1795 | *cks = c; | |
1796 | } | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | if (min_err == 1000) { | |
1801 | WARN_ON(1); | |
1802 | /* use defaults */ | |
1803 | *brr = 255; | |
1804 | *srr = 15; | |
1805 | *cks = 0; | |
1806 | } | |
1807 | } | |
1808 | ||
1ba76220 MD |
1809 | static void sci_reset(struct uart_port *port) |
1810 | { | |
0979e0e6 | 1811 | struct plat_sci_reg *reg; |
1ba76220 MD |
1812 | unsigned int status; |
1813 | ||
1814 | do { | |
b12bb29f | 1815 | status = serial_port_in(port, SCxSR); |
1ba76220 MD |
1816 | } while (!(status & SCxSR_TEND(port))); |
1817 | ||
b12bb29f | 1818 | serial_port_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ |
1ba76220 | 1819 | |
0979e0e6 PM |
1820 | reg = sci_getreg(port, SCFCR); |
1821 | if (reg->size) | |
b12bb29f | 1822 | serial_port_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); |
1ba76220 MD |
1823 | } |
1824 | ||
606d099c AC |
1825 | static void sci_set_termios(struct uart_port *port, struct ktermios *termios, |
1826 | struct ktermios *old) | |
1da177e4 | 1827 | { |
00b9de9c | 1828 | struct sci_port *s = to_sci_port(port); |
0979e0e6 | 1829 | struct plat_sci_reg *reg; |
d4759ded | 1830 | unsigned int baud, smr_val, max_baud, cks = 0; |
a2159b52 | 1831 | int t = -1; |
d4759ded | 1832 | unsigned int srr = 15; |
1da177e4 | 1833 | |
154280fd MD |
1834 | /* |
1835 | * earlyprintk comes here early on with port->uartclk set to zero. | |
1836 | * the clock framework is not up and running at this point so here | |
1837 | * we assume that 115200 is the maximum baud rate. please note that | |
1838 | * the baud rate is not programmed during earlyprintk - it is assumed | |
1839 | * that the previous boot loader has enabled required clocks and | |
1840 | * setup the baud rate generator hardware for us already. | |
1841 | */ | |
1842 | max_baud = port->uartclk ? port->uartclk / 16 : 115200; | |
1da177e4 | 1843 | |
154280fd | 1844 | baud = uart_get_baud_rate(port, termios, old, 0, max_baud); |
f303b364 UH |
1845 | if (likely(baud && port->uartclk)) { |
1846 | if (s->cfg->scbrr_algo_id == SCBRR_ALGO_6) { | |
1847 | sci_baud_calc_hscif(baud, port->uartclk, &t, &srr, | |
1848 | &cks); | |
1849 | } else { | |
1850 | t = sci_scbrr_calc(s->cfg->scbrr_algo_id, baud, | |
1851 | port->uartclk); | |
1852 | for (cks = 0; t >= 256 && cks <= 3; cks++) | |
1853 | t >>= 2; | |
1854 | } | |
1855 | } | |
e108b2ca | 1856 | |
23241d43 | 1857 | sci_port_enable(s); |
36003386 | 1858 | |
1ba76220 | 1859 | sci_reset(port); |
1da177e4 | 1860 | |
b12bb29f | 1861 | smr_val = serial_port_in(port, SCSMR) & 3; |
e8183a6c | 1862 | |
1da177e4 LT |
1863 | if ((termios->c_cflag & CSIZE) == CS7) |
1864 | smr_val |= 0x40; | |
1865 | if (termios->c_cflag & PARENB) | |
1866 | smr_val |= 0x20; | |
1867 | if (termios->c_cflag & PARODD) | |
1868 | smr_val |= 0x30; | |
1869 | if (termios->c_cflag & CSTOPB) | |
1870 | smr_val |= 0x08; | |
1871 | ||
1872 | uart_update_timeout(port, termios->c_cflag, baud); | |
1873 | ||
9d482cc3 TY |
1874 | dev_dbg(port->dev, "%s: SMR %x, cks %x, t %x, SCSCR %x\n", |
1875 | __func__, smr_val, cks, t, s->cfg->scscr); | |
73a19e4c | 1876 | |
4ffc3cdb | 1877 | if (t >= 0) { |
9d482cc3 | 1878 | serial_port_out(port, SCSMR, (smr_val & ~3) | cks); |
b12bb29f | 1879 | serial_port_out(port, SCBRR, t); |
f303b364 UH |
1880 | reg = sci_getreg(port, HSSRR); |
1881 | if (reg->size) | |
1882 | serial_port_out(port, HSSRR, srr | HSCIF_SRE); | |
1da177e4 | 1883 | udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */ |
9d482cc3 TY |
1884 | } else |
1885 | serial_port_out(port, SCSMR, smr_val); | |
1da177e4 | 1886 | |
d5701647 | 1887 | sci_init_pins(port, termios->c_cflag); |
0979e0e6 | 1888 | |
73c3d53f PM |
1889 | reg = sci_getreg(port, SCFCR); |
1890 | if (reg->size) { | |
b12bb29f | 1891 | unsigned short ctrl = serial_port_in(port, SCFCR); |
0979e0e6 | 1892 | |
73c3d53f | 1893 | if (s->cfg->capabilities & SCIx_HAVE_RTSCTS) { |
faf02f8f PM |
1894 | if (termios->c_cflag & CRTSCTS) |
1895 | ctrl |= SCFCR_MCE; | |
1896 | else | |
1897 | ctrl &= ~SCFCR_MCE; | |
faf02f8f | 1898 | } |
73c3d53f PM |
1899 | |
1900 | /* | |
1901 | * As we've done a sci_reset() above, ensure we don't | |
1902 | * interfere with the FIFOs while toggling MCE. As the | |
1903 | * reset values could still be set, simply mask them out. | |
1904 | */ | |
1905 | ctrl &= ~(SCFCR_RFRST | SCFCR_TFRST); | |
1906 | ||
b12bb29f | 1907 | serial_port_out(port, SCFCR, ctrl); |
0979e0e6 | 1908 | } |
b7a76e4b | 1909 | |
b12bb29f | 1910 | serial_port_out(port, SCSCR, s->cfg->scscr); |
1da177e4 | 1911 | |
3089f381 GL |
1912 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
1913 | /* | |
1914 | * Calculate delay for 1.5 DMA buffers: see | |
1915 | * drivers/serial/serial_core.c::uart_update_timeout(). With 10 bits | |
1916 | * (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above function | |
1917 | * calculates 1 jiffie for the data plus 5 jiffies for the "slop(e)." | |
1918 | * Then below we calculate 3 jiffies (12ms) for 1.5 DMA buffers (3 FIFO | |
1919 | * sizes), but it has been found out experimentally, that this is not | |
1920 | * enough: the driver too often needlessly runs on a DMA timeout. 20ms | |
1921 | * as a minimum seem to work perfectly. | |
1922 | */ | |
1923 | if (s->chan_rx) { | |
1924 | s->rx_timeout = (port->timeout - HZ / 50) * s->buf_len_rx * 3 / | |
1925 | port->fifosize / 2; | |
1926 | dev_dbg(port->dev, | |
1927 | "DMA Rx t-out %ums, tty t-out %u jiffies\n", | |
1928 | s->rx_timeout * 1000 / HZ, port->timeout); | |
1929 | if (s->rx_timeout < msecs_to_jiffies(20)) | |
1930 | s->rx_timeout = msecs_to_jiffies(20); | |
1931 | } | |
1932 | #endif | |
1933 | ||
1da177e4 | 1934 | if ((termios->c_cflag & CREAD) != 0) |
73a19e4c | 1935 | sci_start_rx(port); |
36003386 | 1936 | |
23241d43 | 1937 | sci_port_disable(s); |
1da177e4 LT |
1938 | } |
1939 | ||
0174e5ca TK |
1940 | static void sci_pm(struct uart_port *port, unsigned int state, |
1941 | unsigned int oldstate) | |
1942 | { | |
1943 | struct sci_port *sci_port = to_sci_port(port); | |
1944 | ||
1945 | switch (state) { | |
1946 | case 3: | |
1947 | sci_port_disable(sci_port); | |
1948 | break; | |
1949 | default: | |
1950 | sci_port_enable(sci_port); | |
1951 | break; | |
1952 | } | |
1953 | } | |
1954 | ||
1da177e4 LT |
1955 | static const char *sci_type(struct uart_port *port) |
1956 | { | |
1957 | switch (port->type) { | |
e7c98dc7 MT |
1958 | case PORT_IRDA: |
1959 | return "irda"; | |
1960 | case PORT_SCI: | |
1961 | return "sci"; | |
1962 | case PORT_SCIF: | |
1963 | return "scif"; | |
1964 | case PORT_SCIFA: | |
1965 | return "scifa"; | |
d1d4b10c GL |
1966 | case PORT_SCIFB: |
1967 | return "scifb"; | |
f303b364 UH |
1968 | case PORT_HSCIF: |
1969 | return "hscif"; | |
1da177e4 LT |
1970 | } |
1971 | ||
fa43972f | 1972 | return NULL; |
1da177e4 LT |
1973 | } |
1974 | ||
e2651647 | 1975 | static inline unsigned long sci_port_size(struct uart_port *port) |
1da177e4 | 1976 | { |
e2651647 PM |
1977 | /* |
1978 | * Pick an arbitrary size that encapsulates all of the base | |
1979 | * registers by default. This can be optimized later, or derived | |
1980 | * from platform resource data at such a time that ports begin to | |
1981 | * behave more erratically. | |
1982 | */ | |
f303b364 UH |
1983 | if (port->type == PORT_HSCIF) |
1984 | return 96; | |
1985 | else | |
1986 | return 64; | |
1da177e4 LT |
1987 | } |
1988 | ||
f6e9495d PM |
1989 | static int sci_remap_port(struct uart_port *port) |
1990 | { | |
1991 | unsigned long size = sci_port_size(port); | |
1992 | ||
1993 | /* | |
1994 | * Nothing to do if there's already an established membase. | |
1995 | */ | |
1996 | if (port->membase) | |
1997 | return 0; | |
1998 | ||
1999 | if (port->flags & UPF_IOREMAP) { | |
2000 | port->membase = ioremap_nocache(port->mapbase, size); | |
2001 | if (unlikely(!port->membase)) { | |
2002 | dev_err(port->dev, "can't remap port#%d\n", port->line); | |
2003 | return -ENXIO; | |
2004 | } | |
2005 | } else { | |
2006 | /* | |
2007 | * For the simple (and majority of) cases where we don't | |
2008 | * need to do any remapping, just cast the cookie | |
2009 | * directly. | |
2010 | */ | |
2011 | port->membase = (void __iomem *)port->mapbase; | |
2012 | } | |
2013 | ||
2014 | return 0; | |
2015 | } | |
2016 | ||
e2651647 | 2017 | static void sci_release_port(struct uart_port *port) |
1da177e4 | 2018 | { |
e2651647 PM |
2019 | if (port->flags & UPF_IOREMAP) { |
2020 | iounmap(port->membase); | |
2021 | port->membase = NULL; | |
2022 | } | |
2023 | ||
2024 | release_mem_region(port->mapbase, sci_port_size(port)); | |
1da177e4 LT |
2025 | } |
2026 | ||
e2651647 | 2027 | static int sci_request_port(struct uart_port *port) |
1da177e4 | 2028 | { |
e2651647 PM |
2029 | unsigned long size = sci_port_size(port); |
2030 | struct resource *res; | |
f6e9495d | 2031 | int ret; |
1da177e4 | 2032 | |
1020520e | 2033 | res = request_mem_region(port->mapbase, size, dev_name(port->dev)); |
e2651647 PM |
2034 | if (unlikely(res == NULL)) |
2035 | return -EBUSY; | |
1da177e4 | 2036 | |
f6e9495d PM |
2037 | ret = sci_remap_port(port); |
2038 | if (unlikely(ret != 0)) { | |
2039 | release_resource(res); | |
2040 | return ret; | |
7ff731ae | 2041 | } |
e2651647 PM |
2042 | |
2043 | return 0; | |
2044 | } | |
2045 | ||
2046 | static void sci_config_port(struct uart_port *port, int flags) | |
2047 | { | |
2048 | if (flags & UART_CONFIG_TYPE) { | |
2049 | struct sci_port *sport = to_sci_port(port); | |
2050 | ||
2051 | port->type = sport->cfg->type; | |
2052 | sci_request_port(port); | |
2053 | } | |
1da177e4 LT |
2054 | } |
2055 | ||
2056 | static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) | |
2057 | { | |
1da177e4 LT |
2058 | if (ser->baud_base < 2400) |
2059 | /* No paper tape reader for Mitch.. */ | |
2060 | return -EINVAL; | |
2061 | ||
2062 | return 0; | |
2063 | } | |
2064 | ||
2065 | static struct uart_ops sci_uart_ops = { | |
2066 | .tx_empty = sci_tx_empty, | |
2067 | .set_mctrl = sci_set_mctrl, | |
2068 | .get_mctrl = sci_get_mctrl, | |
2069 | .start_tx = sci_start_tx, | |
2070 | .stop_tx = sci_stop_tx, | |
2071 | .stop_rx = sci_stop_rx, | |
2072 | .enable_ms = sci_enable_ms, | |
2073 | .break_ctl = sci_break_ctl, | |
2074 | .startup = sci_startup, | |
2075 | .shutdown = sci_shutdown, | |
2076 | .set_termios = sci_set_termios, | |
0174e5ca | 2077 | .pm = sci_pm, |
1da177e4 LT |
2078 | .type = sci_type, |
2079 | .release_port = sci_release_port, | |
2080 | .request_port = sci_request_port, | |
2081 | .config_port = sci_config_port, | |
2082 | .verify_port = sci_verify_port, | |
07d2a1a1 PM |
2083 | #ifdef CONFIG_CONSOLE_POLL |
2084 | .poll_get_char = sci_poll_get_char, | |
2085 | .poll_put_char = sci_poll_put_char, | |
2086 | #endif | |
1da177e4 LT |
2087 | }; |
2088 | ||
9671f099 | 2089 | static int sci_init_single(struct platform_device *dev, |
1fcc91a6 LP |
2090 | struct sci_port *sci_port, unsigned int index, |
2091 | struct plat_sci_port *p, bool early) | |
e108b2ca | 2092 | { |
73a19e4c | 2093 | struct uart_port *port = &sci_port->port; |
1fcc91a6 LP |
2094 | const struct resource *res; |
2095 | unsigned int i; | |
3127c6b2 | 2096 | int ret; |
e108b2ca | 2097 | |
50f0959a PM |
2098 | sci_port->cfg = p; |
2099 | ||
73a19e4c GL |
2100 | port->ops = &sci_uart_ops; |
2101 | port->iotype = UPIO_MEM; | |
2102 | port->line = index; | |
75136d48 | 2103 | |
1fcc91a6 LP |
2104 | if (dev->num_resources) { |
2105 | /* Device has resources, use them. */ | |
2106 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
2107 | if (res == NULL) | |
2108 | return -ENOMEM; | |
2109 | ||
2110 | port->mapbase = res->start; | |
2111 | ||
2112 | for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) | |
2113 | sci_port->irqs[i] = platform_get_irq(dev, i); | |
2114 | ||
2115 | /* The SCI generates several interrupts. They can be muxed | |
2116 | * together or connected to different interrupt lines. In the | |
2117 | * muxed case only one interrupt resource is specified. In the | |
2118 | * non-muxed case three or four interrupt resources are | |
2119 | * specified, as the BRI interrupt is optional. | |
2120 | */ | |
2121 | if (sci_port->irqs[0] < 0) | |
2122 | return -ENXIO; | |
2123 | ||
2124 | if (sci_port->irqs[1] < 0) { | |
2125 | sci_port->irqs[1] = sci_port->irqs[0]; | |
2126 | sci_port->irqs[2] = sci_port->irqs[0]; | |
2127 | sci_port->irqs[3] = sci_port->irqs[0]; | |
2128 | } | |
2129 | } else { | |
2130 | /* No resources, use old-style platform data. */ | |
2131 | port->mapbase = p->mapbase; | |
2132 | for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) | |
2133 | sci_port->irqs[i] = p->irqs[i] ? p->irqs[i] : -ENXIO; | |
2134 | } | |
2135 | ||
75136d48 | 2136 | switch (p->type) { |
d1d4b10c GL |
2137 | case PORT_SCIFB: |
2138 | port->fifosize = 256; | |
2139 | break; | |
f303b364 UH |
2140 | case PORT_HSCIF: |
2141 | port->fifosize = 128; | |
2142 | break; | |
75136d48 | 2143 | case PORT_SCIFA: |
73a19e4c | 2144 | port->fifosize = 64; |
75136d48 MP |
2145 | break; |
2146 | case PORT_SCIF: | |
73a19e4c | 2147 | port->fifosize = 16; |
75136d48 MP |
2148 | break; |
2149 | default: | |
73a19e4c | 2150 | port->fifosize = 1; |
75136d48 MP |
2151 | break; |
2152 | } | |
7b6fd3bf | 2153 | |
3127c6b2 PM |
2154 | if (p->regtype == SCIx_PROBE_REGTYPE) { |
2155 | ret = sci_probe_regmap(p); | |
fc97114b | 2156 | if (unlikely(ret)) |
3127c6b2 PM |
2157 | return ret; |
2158 | } | |
61a6976b | 2159 | |
1fcc91a6 | 2160 | if (!early) { |
c7ed1ab3 PM |
2161 | sci_port->iclk = clk_get(&dev->dev, "sci_ick"); |
2162 | if (IS_ERR(sci_port->iclk)) { | |
2163 | sci_port->iclk = clk_get(&dev->dev, "peripheral_clk"); | |
2164 | if (IS_ERR(sci_port->iclk)) { | |
2165 | dev_err(&dev->dev, "can't get iclk\n"); | |
2166 | return PTR_ERR(sci_port->iclk); | |
2167 | } | |
2168 | } | |
2169 | ||
2170 | /* | |
2171 | * The function clock is optional, ignore it if we can't | |
2172 | * find it. | |
2173 | */ | |
2174 | sci_port->fclk = clk_get(&dev->dev, "sci_fck"); | |
2175 | if (IS_ERR(sci_port->fclk)) | |
2176 | sci_port->fclk = NULL; | |
2177 | ||
73a19e4c | 2178 | port->dev = &dev->dev; |
5e50d2d6 MD |
2179 | |
2180 | pm_runtime_enable(&dev->dev); | |
7b6fd3bf | 2181 | } |
e108b2ca | 2182 | |
7ed7e071 MD |
2183 | sci_port->break_timer.data = (unsigned long)sci_port; |
2184 | sci_port->break_timer.function = sci_break_timer; | |
2185 | init_timer(&sci_port->break_timer); | |
2186 | ||
debf9507 PM |
2187 | /* |
2188 | * Establish some sensible defaults for the error detection. | |
2189 | */ | |
3ae988d9 | 2190 | sci_port->error_mask = (p->type == PORT_SCI) ? |
debf9507 PM |
2191 | SCI_DEFAULT_ERROR_MASK : SCIF_DEFAULT_ERROR_MASK; |
2192 | ||
2193 | /* | |
2194 | * Establish sensible defaults for the overrun detection, unless | |
2195 | * the part has explicitly disabled support for it. | |
2196 | */ | |
3ae988d9 LP |
2197 | if (p->type == PORT_SCI) |
2198 | sci_port->overrun_bit = 5; | |
2199 | else if (p->scbrr_algo_id == SCBRR_ALGO_4) | |
2200 | sci_port->overrun_bit = 9; | |
2201 | else | |
2202 | sci_port->overrun_bit = 0; | |
debf9507 | 2203 | |
3ae988d9 LP |
2204 | /* |
2205 | * Make the error mask inclusive of overrun detection, if | |
2206 | * supported. | |
2207 | */ | |
2208 | sci_port->error_mask |= 1 << sci_port->overrun_bit; | |
debf9507 | 2209 | |
ce6738b6 | 2210 | port->type = p->type; |
b6e4a3f1 | 2211 | port->flags = UPF_FIXED_PORT | p->flags; |
61a6976b | 2212 | port->regshift = p->regshift; |
73a19e4c | 2213 | |
ce6738b6 | 2214 | /* |
61a6976b | 2215 | * The UART port needs an IRQ value, so we peg this to the RX IRQ |
ce6738b6 PM |
2216 | * for the multi-IRQ ports, which is where we are primarily |
2217 | * concerned with the shutdown path synchronization. | |
2218 | * | |
2219 | * For the muxed case there's nothing more to do. | |
2220 | */ | |
1fcc91a6 | 2221 | port->irq = sci_port->irqs[SCIx_RXI_IRQ]; |
9cfb5c05 | 2222 | port->irqflags = 0; |
73a19e4c | 2223 | |
61a6976b PM |
2224 | port->serial_in = sci_serial_in; |
2225 | port->serial_out = sci_serial_out; | |
2226 | ||
937bb6e4 GL |
2227 | if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) |
2228 | dev_dbg(port->dev, "DMA tx %d, rx %d\n", | |
2229 | p->dma_slave_tx, p->dma_slave_rx); | |
7ed7e071 | 2230 | |
c7ed1ab3 | 2231 | return 0; |
e108b2ca PM |
2232 | } |
2233 | ||
6dae1421 LP |
2234 | static void sci_cleanup_single(struct sci_port *port) |
2235 | { | |
6dae1421 LP |
2236 | clk_put(port->iclk); |
2237 | clk_put(port->fclk); | |
2238 | ||
2239 | pm_runtime_disable(port->port.dev); | |
2240 | } | |
2241 | ||
1da177e4 | 2242 | #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
dc8e6f5b MD |
2243 | static void serial_console_putchar(struct uart_port *port, int ch) |
2244 | { | |
2245 | sci_poll_put_char(port, ch); | |
2246 | } | |
2247 | ||
1da177e4 LT |
2248 | /* |
2249 | * Print a string to the serial port trying not to disturb | |
2250 | * any possible real use of the port... | |
2251 | */ | |
2252 | static void serial_console_write(struct console *co, const char *s, | |
2253 | unsigned count) | |
2254 | { | |
906b17dc PM |
2255 | struct sci_port *sci_port = &sci_ports[co->index]; |
2256 | struct uart_port *port = &sci_port->port; | |
40f70c03 SK |
2257 | unsigned short bits, ctrl; |
2258 | unsigned long flags; | |
2259 | int locked = 1; | |
2260 | ||
2261 | local_irq_save(flags); | |
2262 | if (port->sysrq) | |
2263 | locked = 0; | |
2264 | else if (oops_in_progress) | |
2265 | locked = spin_trylock(&port->lock); | |
2266 | else | |
2267 | spin_lock(&port->lock); | |
2268 | ||
2269 | /* first save the SCSCR then disable the interrupts */ | |
2270 | ctrl = serial_port_in(port, SCSCR); | |
2271 | serial_port_out(port, SCSCR, sci_port->cfg->scscr); | |
07d2a1a1 | 2272 | |
501b825d | 2273 | uart_console_write(port, s, count, serial_console_putchar); |
973e5d52 MD |
2274 | |
2275 | /* wait until fifo is empty and last bit has been transmitted */ | |
2276 | bits = SCxSR_TDxE(port) | SCxSR_TEND(port); | |
b12bb29f | 2277 | while ((serial_port_in(port, SCxSR) & bits) != bits) |
973e5d52 | 2278 | cpu_relax(); |
40f70c03 SK |
2279 | |
2280 | /* restore the SCSCR */ | |
2281 | serial_port_out(port, SCSCR, ctrl); | |
2282 | ||
2283 | if (locked) | |
2284 | spin_unlock(&port->lock); | |
2285 | local_irq_restore(flags); | |
1da177e4 LT |
2286 | } |
2287 | ||
9671f099 | 2288 | static int serial_console_setup(struct console *co, char *options) |
1da177e4 | 2289 | { |
dc8e6f5b | 2290 | struct sci_port *sci_port; |
1da177e4 LT |
2291 | struct uart_port *port; |
2292 | int baud = 115200; | |
2293 | int bits = 8; | |
2294 | int parity = 'n'; | |
2295 | int flow = 'n'; | |
2296 | int ret; | |
2297 | ||
e108b2ca | 2298 | /* |
906b17dc | 2299 | * Refuse to handle any bogus ports. |
1da177e4 | 2300 | */ |
906b17dc | 2301 | if (co->index < 0 || co->index >= SCI_NPORTS) |
e108b2ca | 2302 | return -ENODEV; |
e108b2ca | 2303 | |
906b17dc PM |
2304 | sci_port = &sci_ports[co->index]; |
2305 | port = &sci_port->port; | |
2306 | ||
b2267a6b AC |
2307 | /* |
2308 | * Refuse to handle uninitialized ports. | |
2309 | */ | |
2310 | if (!port->ops) | |
2311 | return -ENODEV; | |
2312 | ||
f6e9495d PM |
2313 | ret = sci_remap_port(port); |
2314 | if (unlikely(ret != 0)) | |
2315 | return ret; | |
e108b2ca | 2316 | |
1da177e4 LT |
2317 | if (options) |
2318 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2319 | ||
ab7cfb55 | 2320 | return uart_set_options(port, co, baud, parity, bits, flow); |
1da177e4 LT |
2321 | } |
2322 | ||
2323 | static struct console serial_console = { | |
2324 | .name = "ttySC", | |
906b17dc | 2325 | .device = uart_console_device, |
1da177e4 LT |
2326 | .write = serial_console_write, |
2327 | .setup = serial_console_setup, | |
fa5da2f7 | 2328 | .flags = CON_PRINTBUFFER, |
1da177e4 | 2329 | .index = -1, |
906b17dc | 2330 | .data = &sci_uart_driver, |
1da177e4 LT |
2331 | }; |
2332 | ||
7b6fd3bf MD |
2333 | static struct console early_serial_console = { |
2334 | .name = "early_ttySC", | |
2335 | .write = serial_console_write, | |
2336 | .flags = CON_PRINTBUFFER, | |
906b17dc | 2337 | .index = -1, |
7b6fd3bf | 2338 | }; |
ecdf8a46 | 2339 | |
7b6fd3bf MD |
2340 | static char early_serial_buf[32]; |
2341 | ||
9671f099 | 2342 | static int sci_probe_earlyprintk(struct platform_device *pdev) |
ecdf8a46 | 2343 | { |
574de559 | 2344 | struct plat_sci_port *cfg = dev_get_platdata(&pdev->dev); |
ecdf8a46 PM |
2345 | |
2346 | if (early_serial_console.data) | |
2347 | return -EEXIST; | |
2348 | ||
2349 | early_serial_console.index = pdev->id; | |
ecdf8a46 | 2350 | |
1fcc91a6 | 2351 | sci_init_single(pdev, &sci_ports[pdev->id], pdev->id, cfg, true); |
ecdf8a46 PM |
2352 | |
2353 | serial_console_setup(&early_serial_console, early_serial_buf); | |
2354 | ||
2355 | if (!strstr(early_serial_buf, "keep")) | |
2356 | early_serial_console.flags |= CON_BOOT; | |
2357 | ||
2358 | register_console(&early_serial_console); | |
2359 | return 0; | |
2360 | } | |
6a8c9799 NI |
2361 | |
2362 | #define SCI_CONSOLE (&serial_console) | |
2363 | ||
ecdf8a46 | 2364 | #else |
9671f099 | 2365 | static inline int sci_probe_earlyprintk(struct platform_device *pdev) |
ecdf8a46 PM |
2366 | { |
2367 | return -EINVAL; | |
2368 | } | |
1da177e4 | 2369 | |
6a8c9799 NI |
2370 | #define SCI_CONSOLE NULL |
2371 | ||
2372 | #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */ | |
1da177e4 LT |
2373 | |
2374 | static char banner[] __initdata = | |
f303b364 | 2375 | KERN_INFO "SuperH (H)SCI(F) driver initialized\n"; |
1da177e4 LT |
2376 | |
2377 | static struct uart_driver sci_uart_driver = { | |
2378 | .owner = THIS_MODULE, | |
2379 | .driver_name = "sci", | |
1da177e4 LT |
2380 | .dev_name = "ttySC", |
2381 | .major = SCI_MAJOR, | |
2382 | .minor = SCI_MINOR_START, | |
e108b2ca | 2383 | .nr = SCI_NPORTS, |
1da177e4 LT |
2384 | .cons = SCI_CONSOLE, |
2385 | }; | |
2386 | ||
54507f6e | 2387 | static int sci_remove(struct platform_device *dev) |
e552de24 | 2388 | { |
d535a230 | 2389 | struct sci_port *port = platform_get_drvdata(dev); |
e552de24 | 2390 | |
d535a230 PM |
2391 | cpufreq_unregister_notifier(&port->freq_transition, |
2392 | CPUFREQ_TRANSITION_NOTIFIER); | |
e552de24 | 2393 | |
d535a230 PM |
2394 | uart_remove_one_port(&sci_uart_driver, &port->port); |
2395 | ||
6dae1421 | 2396 | sci_cleanup_single(port); |
e552de24 | 2397 | |
e552de24 MD |
2398 | return 0; |
2399 | } | |
2400 | ||
9671f099 | 2401 | static int sci_probe_single(struct platform_device *dev, |
0ee70712 MD |
2402 | unsigned int index, |
2403 | struct plat_sci_port *p, | |
2404 | struct sci_port *sciport) | |
2405 | { | |
0ee70712 MD |
2406 | int ret; |
2407 | ||
2408 | /* Sanity check */ | |
2409 | if (unlikely(index >= SCI_NPORTS)) { | |
2410 | dev_notice(&dev->dev, "Attempting to register port " | |
2411 | "%d when only %d are available.\n", | |
2412 | index+1, SCI_NPORTS); | |
2413 | dev_notice(&dev->dev, "Consider bumping " | |
2414 | "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); | |
b6c5ef6f | 2415 | return -EINVAL; |
0ee70712 MD |
2416 | } |
2417 | ||
1fcc91a6 | 2418 | ret = sci_init_single(dev, sciport, index, p, false); |
c7ed1ab3 PM |
2419 | if (ret) |
2420 | return ret; | |
0ee70712 | 2421 | |
6dae1421 LP |
2422 | ret = uart_add_one_port(&sci_uart_driver, &sciport->port); |
2423 | if (ret) { | |
2424 | sci_cleanup_single(sciport); | |
2425 | return ret; | |
2426 | } | |
2427 | ||
2428 | return 0; | |
0ee70712 MD |
2429 | } |
2430 | ||
9671f099 | 2431 | static int sci_probe(struct platform_device *dev) |
1da177e4 | 2432 | { |
3ba35baa | 2433 | struct plat_sci_port *p = dev_get_platdata(&dev->dev); |
d535a230 | 2434 | struct sci_port *sp = &sci_ports[dev->id]; |
ecdf8a46 | 2435 | int ret; |
d535a230 | 2436 | |
ecdf8a46 PM |
2437 | /* |
2438 | * If we've come here via earlyprintk initialization, head off to | |
2439 | * the special early probe. We don't have sufficient device state | |
2440 | * to make it beyond this yet. | |
2441 | */ | |
2442 | if (is_early_platform_device(dev)) | |
2443 | return sci_probe_earlyprintk(dev); | |
7b6fd3bf | 2444 | |
d535a230 | 2445 | platform_set_drvdata(dev, sp); |
e552de24 | 2446 | |
906b17dc | 2447 | ret = sci_probe_single(dev, dev->id, p, sp); |
d535a230 | 2448 | if (ret) |
6dae1421 | 2449 | return ret; |
e552de24 | 2450 | |
d535a230 | 2451 | sp->freq_transition.notifier_call = sci_notifier; |
1da177e4 | 2452 | |
d535a230 PM |
2453 | ret = cpufreq_register_notifier(&sp->freq_transition, |
2454 | CPUFREQ_TRANSITION_NOTIFIER); | |
6dae1421 LP |
2455 | if (unlikely(ret < 0)) { |
2456 | sci_cleanup_single(sp); | |
2457 | return ret; | |
2458 | } | |
1da177e4 LT |
2459 | |
2460 | #ifdef CONFIG_SH_STANDARD_BIOS | |
2461 | sh_bios_gdb_detach(); | |
2462 | #endif | |
2463 | ||
e108b2ca | 2464 | return 0; |
1da177e4 LT |
2465 | } |
2466 | ||
6daa79b3 | 2467 | static int sci_suspend(struct device *dev) |
1da177e4 | 2468 | { |
d535a230 | 2469 | struct sci_port *sport = dev_get_drvdata(dev); |
e108b2ca | 2470 | |
d535a230 PM |
2471 | if (sport) |
2472 | uart_suspend_port(&sci_uart_driver, &sport->port); | |
1da177e4 | 2473 | |
e108b2ca PM |
2474 | return 0; |
2475 | } | |
1da177e4 | 2476 | |
6daa79b3 | 2477 | static int sci_resume(struct device *dev) |
e108b2ca | 2478 | { |
d535a230 | 2479 | struct sci_port *sport = dev_get_drvdata(dev); |
e108b2ca | 2480 | |
d535a230 PM |
2481 | if (sport) |
2482 | uart_resume_port(&sci_uart_driver, &sport->port); | |
e108b2ca PM |
2483 | |
2484 | return 0; | |
2485 | } | |
2486 | ||
47145210 | 2487 | static const struct dev_pm_ops sci_dev_pm_ops = { |
6daa79b3 PM |
2488 | .suspend = sci_suspend, |
2489 | .resume = sci_resume, | |
2490 | }; | |
2491 | ||
e108b2ca PM |
2492 | static struct platform_driver sci_driver = { |
2493 | .probe = sci_probe, | |
b9e39c89 | 2494 | .remove = sci_remove, |
e108b2ca PM |
2495 | .driver = { |
2496 | .name = "sh-sci", | |
2497 | .owner = THIS_MODULE, | |
6daa79b3 | 2498 | .pm = &sci_dev_pm_ops, |
e108b2ca PM |
2499 | }, |
2500 | }; | |
2501 | ||
2502 | static int __init sci_init(void) | |
2503 | { | |
2504 | int ret; | |
2505 | ||
2506 | printk(banner); | |
2507 | ||
e108b2ca PM |
2508 | ret = uart_register_driver(&sci_uart_driver); |
2509 | if (likely(ret == 0)) { | |
2510 | ret = platform_driver_register(&sci_driver); | |
2511 | if (unlikely(ret)) | |
2512 | uart_unregister_driver(&sci_uart_driver); | |
2513 | } | |
2514 | ||
2515 | return ret; | |
2516 | } | |
2517 | ||
2518 | static void __exit sci_exit(void) | |
2519 | { | |
2520 | platform_driver_unregister(&sci_driver); | |
1da177e4 LT |
2521 | uart_unregister_driver(&sci_uart_driver); |
2522 | } | |
2523 | ||
7b6fd3bf MD |
2524 | #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
2525 | early_platform_init_buffer("earlyprintk", &sci_driver, | |
2526 | early_serial_buf, ARRAY_SIZE(early_serial_buf)); | |
2527 | #endif | |
1da177e4 LT |
2528 | module_init(sci_init); |
2529 | module_exit(sci_exit); | |
2530 | ||
e108b2ca | 2531 | MODULE_LICENSE("GPL"); |
e169c139 | 2532 | MODULE_ALIAS("platform:sh-sci"); |
7f405f9c | 2533 | MODULE_AUTHOR("Paul Mundt"); |
f303b364 | 2534 | MODULE_DESCRIPTION("SuperH (H)SCI(F) serial driver"); |