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> |
20bdcab8 | 42 | #include <linux/of.h> |
8fb9631c | 43 | #include <linux/platform_device.h> |
5e50d2d6 | 44 | #include <linux/pm_runtime.h> |
73a19e4c | 45 | #include <linux/scatterlist.h> |
8fb9631c LP |
46 | #include <linux/serial.h> |
47 | #include <linux/serial_sci.h> | |
48 | #include <linux/sh_dma.h> | |
5a0e3ad6 | 49 | #include <linux/slab.h> |
8fb9631c LP |
50 | #include <linux/string.h> |
51 | #include <linux/sysrq.h> | |
52 | #include <linux/timer.h> | |
53 | #include <linux/tty.h> | |
54 | #include <linux/tty_flip.h> | |
85f094ec PM |
55 | |
56 | #ifdef CONFIG_SUPERH | |
1da177e4 LT |
57 | #include <asm/sh_bios.h> |
58 | #endif | |
59 | ||
1da177e4 LT |
60 | #include "sh-sci.h" |
61 | ||
89b5c1ab LP |
62 | /* Offsets into the sci_port->irqs array */ |
63 | enum { | |
64 | SCIx_ERI_IRQ, | |
65 | SCIx_RXI_IRQ, | |
66 | SCIx_TXI_IRQ, | |
67 | SCIx_BRI_IRQ, | |
68 | SCIx_NR_IRQS, | |
69 | ||
70 | SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */ | |
71 | }; | |
72 | ||
73 | #define SCIx_IRQ_IS_MUXED(port) \ | |
74 | ((port)->irqs[SCIx_ERI_IRQ] == \ | |
75 | (port)->irqs[SCIx_RXI_IRQ]) || \ | |
76 | ((port)->irqs[SCIx_ERI_IRQ] && \ | |
77 | ((port)->irqs[SCIx_RXI_IRQ] < 0)) | |
78 | ||
e108b2ca PM |
79 | struct sci_port { |
80 | struct uart_port port; | |
81 | ||
ce6738b6 PM |
82 | /* Platform configuration */ |
83 | struct plat_sci_port *cfg; | |
2e0842a1 | 84 | unsigned int overrun_reg; |
75c249fd | 85 | unsigned int overrun_mask; |
3ae988d9 | 86 | unsigned int error_mask; |
ec09c5eb | 87 | unsigned int sampling_rate; |
e4d6f911 | 88 | resource_size_t reg_size; |
e108b2ca | 89 | |
e108b2ca PM |
90 | /* Break timer */ |
91 | struct timer_list break_timer; | |
92 | int break_flag; | |
1534a3b3 | 93 | |
501b825d MD |
94 | /* Interface clock */ |
95 | struct clk *iclk; | |
c7ed1ab3 PM |
96 | /* Function clock */ |
97 | struct clk *fclk; | |
edad1f20 | 98 | |
1fcc91a6 | 99 | int irqs[SCIx_NR_IRQS]; |
9174fc8f PM |
100 | char *irqstr[SCIx_NR_IRQS]; |
101 | ||
73a19e4c GL |
102 | struct dma_chan *chan_tx; |
103 | struct dma_chan *chan_rx; | |
f43dc23d | 104 | |
73a19e4c | 105 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
73a19e4c GL |
106 | struct dma_async_tx_descriptor *desc_tx; |
107 | struct dma_async_tx_descriptor *desc_rx[2]; | |
108 | dma_cookie_t cookie_tx; | |
109 | dma_cookie_t cookie_rx[2]; | |
110 | dma_cookie_t active_rx; | |
111 | struct scatterlist sg_tx; | |
112 | unsigned int sg_len_tx; | |
113 | struct scatterlist sg_rx[2]; | |
114 | size_t buf_len_rx; | |
115 | struct sh_dmae_slave param_tx; | |
116 | struct sh_dmae_slave param_rx; | |
117 | struct work_struct work_tx; | |
118 | struct work_struct work_rx; | |
119 | struct timer_list rx_timer; | |
3089f381 | 120 | unsigned int rx_timeout; |
73a19e4c | 121 | #endif |
e552de24 | 122 | |
d535a230 | 123 | struct notifier_block freq_transition; |
e108b2ca PM |
124 | }; |
125 | ||
1da177e4 | 126 | /* Function prototypes */ |
d535a230 | 127 | static void sci_start_tx(struct uart_port *port); |
b129a8cc | 128 | static void sci_stop_tx(struct uart_port *port); |
d535a230 | 129 | static void sci_start_rx(struct uart_port *port); |
1da177e4 | 130 | |
e108b2ca | 131 | #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS |
b7a76e4b | 132 | |
e108b2ca PM |
133 | static struct sci_port sci_ports[SCI_NPORTS]; |
134 | static struct uart_driver sci_uart_driver; | |
1da177e4 | 135 | |
e7c98dc7 MT |
136 | static inline struct sci_port * |
137 | to_sci_port(struct uart_port *uart) | |
138 | { | |
139 | return container_of(uart, struct sci_port, port); | |
140 | } | |
141 | ||
61a6976b PM |
142 | struct plat_sci_reg { |
143 | u8 offset, size; | |
144 | }; | |
145 | ||
146 | /* Helper for invalidating specific entries of an inherited map. */ | |
147 | #define sci_reg_invalid { .offset = 0, .size = 0 } | |
148 | ||
149 | static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { | |
150 | [SCIx_PROBE_REGTYPE] = { | |
151 | [0 ... SCIx_NR_REGS - 1] = sci_reg_invalid, | |
152 | }, | |
153 | ||
154 | /* | |
155 | * Common SCI definitions, dependent on the port's regshift | |
156 | * value. | |
157 | */ | |
158 | [SCIx_SCI_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] = sci_reg_invalid, | |
166 | [SCFDR] = sci_reg_invalid, | |
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, |
c097abc3 GU |
172 | [SCPCR] = sci_reg_invalid, |
173 | [SCPDR] = sci_reg_invalid, | |
61a6976b PM |
174 | }, |
175 | ||
176 | /* | |
177 | * Common definitions for legacy IrDA ports, dependent on | |
178 | * regshift value. | |
179 | */ | |
180 | [SCIx_IRDA_REGTYPE] = { | |
181 | [SCSMR] = { 0x00, 8 }, | |
182 | [SCBRR] = { 0x01, 8 }, | |
183 | [SCSCR] = { 0x02, 8 }, | |
184 | [SCxTDR] = { 0x03, 8 }, | |
185 | [SCxSR] = { 0x04, 8 }, | |
186 | [SCxRDR] = { 0x05, 8 }, | |
187 | [SCFCR] = { 0x06, 8 }, | |
188 | [SCFDR] = { 0x07, 16 }, | |
189 | [SCTFDR] = sci_reg_invalid, | |
190 | [SCRFDR] = sci_reg_invalid, | |
191 | [SCSPTR] = sci_reg_invalid, | |
192 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 193 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
194 | [SCPCR] = sci_reg_invalid, |
195 | [SCPDR] = sci_reg_invalid, | |
61a6976b PM |
196 | }, |
197 | ||
198 | /* | |
199 | * Common SCIFA definitions. | |
200 | */ | |
201 | [SCIx_SCIFA_REGTYPE] = { | |
202 | [SCSMR] = { 0x00, 16 }, | |
203 | [SCBRR] = { 0x04, 8 }, | |
204 | [SCSCR] = { 0x08, 16 }, | |
205 | [SCxTDR] = { 0x20, 8 }, | |
206 | [SCxSR] = { 0x14, 16 }, | |
207 | [SCxRDR] = { 0x24, 8 }, | |
208 | [SCFCR] = { 0x18, 16 }, | |
209 | [SCFDR] = { 0x1c, 16 }, | |
210 | [SCTFDR] = sci_reg_invalid, | |
211 | [SCRFDR] = sci_reg_invalid, | |
212 | [SCSPTR] = sci_reg_invalid, | |
213 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 214 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
215 | [SCPCR] = { 0x30, 16 }, |
216 | [SCPDR] = { 0x34, 16 }, | |
61a6976b PM |
217 | }, |
218 | ||
219 | /* | |
220 | * Common SCIFB definitions. | |
221 | */ | |
222 | [SCIx_SCIFB_REGTYPE] = { | |
223 | [SCSMR] = { 0x00, 16 }, | |
224 | [SCBRR] = { 0x04, 8 }, | |
225 | [SCSCR] = { 0x08, 16 }, | |
226 | [SCxTDR] = { 0x40, 8 }, | |
227 | [SCxSR] = { 0x14, 16 }, | |
228 | [SCxRDR] = { 0x60, 8 }, | |
229 | [SCFCR] = { 0x18, 16 }, | |
8c66d6d2 TY |
230 | [SCFDR] = sci_reg_invalid, |
231 | [SCTFDR] = { 0x38, 16 }, | |
232 | [SCRFDR] = { 0x3c, 16 }, | |
61a6976b PM |
233 | [SCSPTR] = sci_reg_invalid, |
234 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 235 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
236 | [SCPCR] = { 0x30, 16 }, |
237 | [SCPDR] = { 0x34, 16 }, | |
61a6976b PM |
238 | }, |
239 | ||
3af1f8a4 PE |
240 | /* |
241 | * Common SH-2(A) SCIF definitions for ports with FIFO data | |
242 | * count registers. | |
243 | */ | |
244 | [SCIx_SH2_SCIF_FIFODATA_REGTYPE] = { | |
245 | [SCSMR] = { 0x00, 16 }, | |
246 | [SCBRR] = { 0x04, 8 }, | |
247 | [SCSCR] = { 0x08, 16 }, | |
248 | [SCxTDR] = { 0x0c, 8 }, | |
249 | [SCxSR] = { 0x10, 16 }, | |
250 | [SCxRDR] = { 0x14, 8 }, | |
251 | [SCFCR] = { 0x18, 16 }, | |
252 | [SCFDR] = { 0x1c, 16 }, | |
253 | [SCTFDR] = sci_reg_invalid, | |
254 | [SCRFDR] = sci_reg_invalid, | |
255 | [SCSPTR] = { 0x20, 16 }, | |
256 | [SCLSR] = { 0x24, 16 }, | |
f303b364 | 257 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
258 | [SCPCR] = sci_reg_invalid, |
259 | [SCPDR] = sci_reg_invalid, | |
3af1f8a4 PE |
260 | }, |
261 | ||
61a6976b PM |
262 | /* |
263 | * Common SH-3 SCIF definitions. | |
264 | */ | |
265 | [SCIx_SH3_SCIF_REGTYPE] = { | |
266 | [SCSMR] = { 0x00, 8 }, | |
267 | [SCBRR] = { 0x02, 8 }, | |
268 | [SCSCR] = { 0x04, 8 }, | |
269 | [SCxTDR] = { 0x06, 8 }, | |
270 | [SCxSR] = { 0x08, 16 }, | |
271 | [SCxRDR] = { 0x0a, 8 }, | |
272 | [SCFCR] = { 0x0c, 8 }, | |
273 | [SCFDR] = { 0x0e, 16 }, | |
274 | [SCTFDR] = sci_reg_invalid, | |
275 | [SCRFDR] = sci_reg_invalid, | |
276 | [SCSPTR] = sci_reg_invalid, | |
277 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 278 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
279 | [SCPCR] = sci_reg_invalid, |
280 | [SCPDR] = sci_reg_invalid, | |
61a6976b PM |
281 | }, |
282 | ||
283 | /* | |
284 | * Common SH-4(A) SCIF(B) definitions. | |
285 | */ | |
286 | [SCIx_SH4_SCIF_REGTYPE] = { | |
287 | [SCSMR] = { 0x00, 16 }, | |
288 | [SCBRR] = { 0x04, 8 }, | |
289 | [SCSCR] = { 0x08, 16 }, | |
290 | [SCxTDR] = { 0x0c, 8 }, | |
291 | [SCxSR] = { 0x10, 16 }, | |
292 | [SCxRDR] = { 0x14, 8 }, | |
293 | [SCFCR] = { 0x18, 16 }, | |
294 | [SCFDR] = { 0x1c, 16 }, | |
295 | [SCTFDR] = sci_reg_invalid, | |
296 | [SCRFDR] = sci_reg_invalid, | |
297 | [SCSPTR] = { 0x20, 16 }, | |
298 | [SCLSR] = { 0x24, 16 }, | |
f303b364 | 299 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
300 | [SCPCR] = sci_reg_invalid, |
301 | [SCPDR] = sci_reg_invalid, | |
f303b364 UH |
302 | }, |
303 | ||
304 | /* | |
305 | * Common HSCIF definitions. | |
306 | */ | |
307 | [SCIx_HSCIF_REGTYPE] = { | |
308 | [SCSMR] = { 0x00, 16 }, | |
309 | [SCBRR] = { 0x04, 8 }, | |
310 | [SCSCR] = { 0x08, 16 }, | |
311 | [SCxTDR] = { 0x0c, 8 }, | |
312 | [SCxSR] = { 0x10, 16 }, | |
313 | [SCxRDR] = { 0x14, 8 }, | |
314 | [SCFCR] = { 0x18, 16 }, | |
315 | [SCFDR] = { 0x1c, 16 }, | |
316 | [SCTFDR] = sci_reg_invalid, | |
317 | [SCRFDR] = sci_reg_invalid, | |
318 | [SCSPTR] = { 0x20, 16 }, | |
319 | [SCLSR] = { 0x24, 16 }, | |
320 | [HSSRR] = { 0x40, 16 }, | |
c097abc3 GU |
321 | [SCPCR] = sci_reg_invalid, |
322 | [SCPDR] = sci_reg_invalid, | |
61a6976b PM |
323 | }, |
324 | ||
325 | /* | |
326 | * Common SH-4(A) SCIF(B) definitions for ports without an SCSPTR | |
327 | * register. | |
328 | */ | |
329 | [SCIx_SH4_SCIF_NO_SCSPTR_REGTYPE] = { | |
330 | [SCSMR] = { 0x00, 16 }, | |
331 | [SCBRR] = { 0x04, 8 }, | |
332 | [SCSCR] = { 0x08, 16 }, | |
333 | [SCxTDR] = { 0x0c, 8 }, | |
334 | [SCxSR] = { 0x10, 16 }, | |
335 | [SCxRDR] = { 0x14, 8 }, | |
336 | [SCFCR] = { 0x18, 16 }, | |
337 | [SCFDR] = { 0x1c, 16 }, | |
338 | [SCTFDR] = sci_reg_invalid, | |
339 | [SCRFDR] = sci_reg_invalid, | |
340 | [SCSPTR] = sci_reg_invalid, | |
341 | [SCLSR] = { 0x24, 16 }, | |
f303b364 | 342 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
343 | [SCPCR] = sci_reg_invalid, |
344 | [SCPDR] = sci_reg_invalid, | |
61a6976b PM |
345 | }, |
346 | ||
347 | /* | |
348 | * Common SH-4(A) SCIF(B) definitions for ports with FIFO data | |
349 | * count registers. | |
350 | */ | |
351 | [SCIx_SH4_SCIF_FIFODATA_REGTYPE] = { | |
352 | [SCSMR] = { 0x00, 16 }, | |
353 | [SCBRR] = { 0x04, 8 }, | |
354 | [SCSCR] = { 0x08, 16 }, | |
355 | [SCxTDR] = { 0x0c, 8 }, | |
356 | [SCxSR] = { 0x10, 16 }, | |
357 | [SCxRDR] = { 0x14, 8 }, | |
358 | [SCFCR] = { 0x18, 16 }, | |
359 | [SCFDR] = { 0x1c, 16 }, | |
360 | [SCTFDR] = { 0x1c, 16 }, /* aliased to SCFDR */ | |
361 | [SCRFDR] = { 0x20, 16 }, | |
362 | [SCSPTR] = { 0x24, 16 }, | |
363 | [SCLSR] = { 0x28, 16 }, | |
f303b364 | 364 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
365 | [SCPCR] = sci_reg_invalid, |
366 | [SCPDR] = sci_reg_invalid, | |
61a6976b PM |
367 | }, |
368 | ||
369 | /* | |
370 | * SH7705-style SCIF(B) ports, lacking both SCSPTR and SCLSR | |
371 | * registers. | |
372 | */ | |
373 | [SCIx_SH7705_SCIF_REGTYPE] = { | |
374 | [SCSMR] = { 0x00, 16 }, | |
375 | [SCBRR] = { 0x04, 8 }, | |
376 | [SCSCR] = { 0x08, 16 }, | |
377 | [SCxTDR] = { 0x20, 8 }, | |
378 | [SCxSR] = { 0x14, 16 }, | |
379 | [SCxRDR] = { 0x24, 8 }, | |
380 | [SCFCR] = { 0x18, 16 }, | |
381 | [SCFDR] = { 0x1c, 16 }, | |
382 | [SCTFDR] = sci_reg_invalid, | |
383 | [SCRFDR] = sci_reg_invalid, | |
384 | [SCSPTR] = sci_reg_invalid, | |
385 | [SCLSR] = sci_reg_invalid, | |
f303b364 | 386 | [HSSRR] = sci_reg_invalid, |
c097abc3 GU |
387 | [SCPCR] = sci_reg_invalid, |
388 | [SCPDR] = sci_reg_invalid, | |
61a6976b PM |
389 | }, |
390 | }; | |
391 | ||
72b294cf PM |
392 | #define sci_getreg(up, offset) (sci_regmap[to_sci_port(up)->cfg->regtype] + offset) |
393 | ||
61a6976b PM |
394 | /* |
395 | * The "offset" here is rather misleading, in that it refers to an enum | |
396 | * value relative to the port mapping rather than the fixed offset | |
397 | * itself, which needs to be manually retrieved from the platform's | |
398 | * register map for the given port. | |
399 | */ | |
400 | static unsigned int sci_serial_in(struct uart_port *p, int offset) | |
401 | { | |
72b294cf | 402 | struct plat_sci_reg *reg = sci_getreg(p, offset); |
61a6976b PM |
403 | |
404 | if (reg->size == 8) | |
405 | return ioread8(p->membase + (reg->offset << p->regshift)); | |
406 | else if (reg->size == 16) | |
407 | return ioread16(p->membase + (reg->offset << p->regshift)); | |
408 | else | |
409 | WARN(1, "Invalid register access\n"); | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | static void sci_serial_out(struct uart_port *p, int offset, int value) | |
415 | { | |
72b294cf | 416 | struct plat_sci_reg *reg = sci_getreg(p, offset); |
61a6976b PM |
417 | |
418 | if (reg->size == 8) | |
419 | iowrite8(value, p->membase + (reg->offset << p->regshift)); | |
420 | else if (reg->size == 16) | |
421 | iowrite16(value, p->membase + (reg->offset << p->regshift)); | |
422 | else | |
423 | WARN(1, "Invalid register access\n"); | |
424 | } | |
425 | ||
61a6976b PM |
426 | static int sci_probe_regmap(struct plat_sci_port *cfg) |
427 | { | |
428 | switch (cfg->type) { | |
429 | case PORT_SCI: | |
430 | cfg->regtype = SCIx_SCI_REGTYPE; | |
431 | break; | |
432 | case PORT_IRDA: | |
433 | cfg->regtype = SCIx_IRDA_REGTYPE; | |
434 | break; | |
435 | case PORT_SCIFA: | |
436 | cfg->regtype = SCIx_SCIFA_REGTYPE; | |
437 | break; | |
438 | case PORT_SCIFB: | |
439 | cfg->regtype = SCIx_SCIFB_REGTYPE; | |
440 | break; | |
441 | case PORT_SCIF: | |
442 | /* | |
443 | * The SH-4 is a bit of a misnomer here, although that's | |
444 | * where this particular port layout originated. This | |
445 | * configuration (or some slight variation thereof) | |
446 | * remains the dominant model for all SCIFs. | |
447 | */ | |
448 | cfg->regtype = SCIx_SH4_SCIF_REGTYPE; | |
449 | break; | |
f303b364 UH |
450 | case PORT_HSCIF: |
451 | cfg->regtype = SCIx_HSCIF_REGTYPE; | |
452 | break; | |
61a6976b | 453 | default: |
6c13d5d2 | 454 | pr_err("Can't probe register map for given port\n"); |
61a6976b PM |
455 | return -EINVAL; |
456 | } | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
23241d43 PM |
461 | static void sci_port_enable(struct sci_port *sci_port) |
462 | { | |
463 | if (!sci_port->port.dev) | |
464 | return; | |
465 | ||
466 | pm_runtime_get_sync(sci_port->port.dev); | |
467 | ||
b016b646 | 468 | clk_prepare_enable(sci_port->iclk); |
23241d43 | 469 | sci_port->port.uartclk = clk_get_rate(sci_port->iclk); |
b016b646 | 470 | clk_prepare_enable(sci_port->fclk); |
23241d43 PM |
471 | } |
472 | ||
473 | static void sci_port_disable(struct sci_port *sci_port) | |
474 | { | |
475 | if (!sci_port->port.dev) | |
476 | return; | |
477 | ||
caec7038 LP |
478 | /* Cancel the break timer to ensure that the timer handler will not try |
479 | * to access the hardware with clocks and power disabled. Reset the | |
480 | * break flag to make the break debouncing state machine ready for the | |
481 | * next break. | |
482 | */ | |
483 | del_timer_sync(&sci_port->break_timer); | |
484 | sci_port->break_flag = 0; | |
485 | ||
b016b646 LP |
486 | clk_disable_unprepare(sci_port->fclk); |
487 | clk_disable_unprepare(sci_port->iclk); | |
23241d43 PM |
488 | |
489 | pm_runtime_put_sync(sci_port->port.dev); | |
490 | } | |
491 | ||
07d2a1a1 | 492 | #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE) |
1f6fd5c9 PM |
493 | |
494 | #ifdef CONFIG_CONSOLE_POLL | |
07d2a1a1 | 495 | static int sci_poll_get_char(struct uart_port *port) |
1da177e4 | 496 | { |
1da177e4 LT |
497 | unsigned short status; |
498 | int c; | |
499 | ||
e108b2ca | 500 | do { |
b12bb29f | 501 | status = serial_port_in(port, SCxSR); |
1da177e4 | 502 | if (status & SCxSR_ERRORS(port)) { |
b12bb29f | 503 | serial_port_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); |
1da177e4 LT |
504 | continue; |
505 | } | |
3f255eb3 JW |
506 | break; |
507 | } while (1); | |
508 | ||
509 | if (!(status & SCxSR_RDxF(port))) | |
510 | return NO_POLL_CHAR; | |
07d2a1a1 | 511 | |
b12bb29f | 512 | c = serial_port_in(port, SCxRDR); |
07d2a1a1 | 513 | |
e7c98dc7 | 514 | /* Dummy read */ |
b12bb29f PM |
515 | serial_port_in(port, SCxSR); |
516 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); | |
1da177e4 LT |
517 | |
518 | return c; | |
519 | } | |
1f6fd5c9 | 520 | #endif |
1da177e4 | 521 | |
07d2a1a1 | 522 | static void sci_poll_put_char(struct uart_port *port, unsigned char c) |
1da177e4 | 523 | { |
1da177e4 LT |
524 | unsigned short status; |
525 | ||
1da177e4 | 526 | do { |
b12bb29f | 527 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
528 | } while (!(status & SCxSR_TDxE(port))); |
529 | ||
b12bb29f PM |
530 | serial_port_out(port, SCxTDR, c); |
531 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port)); | |
1da177e4 | 532 | } |
07d2a1a1 | 533 | #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */ |
1da177e4 | 534 | |
61a6976b | 535 | static void sci_init_pins(struct uart_port *port, unsigned int cflag) |
1da177e4 | 536 | { |
61a6976b PM |
537 | struct sci_port *s = to_sci_port(port); |
538 | struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR; | |
1da177e4 | 539 | |
61a6976b PM |
540 | /* |
541 | * Use port-specific handler if provided. | |
542 | */ | |
543 | if (s->cfg->ops && s->cfg->ops->init_pins) { | |
544 | s->cfg->ops->init_pins(port, cflag); | |
545 | return; | |
1da177e4 | 546 | } |
41504c39 | 547 | |
61a6976b PM |
548 | /* |
549 | * For the generic path SCSPTR is necessary. Bail out if that's | |
550 | * unavailable, too. | |
551 | */ | |
552 | if (!reg->size) | |
553 | return; | |
41504c39 | 554 | |
faf02f8f PM |
555 | if ((s->cfg->capabilities & SCIx_HAVE_RTSCTS) && |
556 | ((!(cflag & CRTSCTS)))) { | |
557 | unsigned short status; | |
558 | ||
b12bb29f | 559 | status = serial_port_in(port, SCSPTR); |
faf02f8f PM |
560 | status &= ~SCSPTR_CTSIO; |
561 | status |= SCSPTR_RTSIO; | |
b12bb29f | 562 | serial_port_out(port, SCSPTR, status); /* Set RTS = 1 */ |
faf02f8f | 563 | } |
d5701647 | 564 | } |
e108b2ca | 565 | |
72b294cf | 566 | static int sci_txfill(struct uart_port *port) |
e108b2ca | 567 | { |
72b294cf | 568 | struct plat_sci_reg *reg; |
e108b2ca | 569 | |
72b294cf PM |
570 | reg = sci_getreg(port, SCTFDR); |
571 | if (reg->size) | |
63f7ad11 | 572 | return serial_port_in(port, SCTFDR) & ((port->fifosize << 1) - 1); |
c63847a3 | 573 | |
72b294cf PM |
574 | reg = sci_getreg(port, SCFDR); |
575 | if (reg->size) | |
b12bb29f | 576 | return serial_port_in(port, SCFDR) >> 8; |
d1d4b10c | 577 | |
b12bb29f | 578 | return !(serial_port_in(port, SCxSR) & SCI_TDRE); |
e108b2ca PM |
579 | } |
580 | ||
73a19e4c GL |
581 | static int sci_txroom(struct uart_port *port) |
582 | { | |
72b294cf | 583 | return port->fifosize - sci_txfill(port); |
73a19e4c GL |
584 | } |
585 | ||
586 | static int sci_rxfill(struct uart_port *port) | |
e108b2ca | 587 | { |
72b294cf PM |
588 | struct plat_sci_reg *reg; |
589 | ||
590 | reg = sci_getreg(port, SCRFDR); | |
591 | if (reg->size) | |
63f7ad11 | 592 | return serial_port_in(port, SCRFDR) & ((port->fifosize << 1) - 1); |
72b294cf PM |
593 | |
594 | reg = sci_getreg(port, SCFDR); | |
595 | if (reg->size) | |
b12bb29f | 596 | return serial_port_in(port, SCFDR) & ((port->fifosize << 1) - 1); |
72b294cf | 597 | |
b12bb29f | 598 | return (serial_port_in(port, SCxSR) & SCxSR_RDxF(port)) != 0; |
e108b2ca PM |
599 | } |
600 | ||
514820eb PM |
601 | /* |
602 | * SCI helper for checking the state of the muxed port/RXD pins. | |
603 | */ | |
604 | static inline int sci_rxd_in(struct uart_port *port) | |
605 | { | |
606 | struct sci_port *s = to_sci_port(port); | |
607 | ||
608 | if (s->cfg->port_reg <= 0) | |
609 | return 1; | |
610 | ||
0dd4d5cb | 611 | /* Cast for ARM damage */ |
e2afca69 | 612 | return !!__raw_readb((void __iomem *)(uintptr_t)s->cfg->port_reg); |
514820eb PM |
613 | } |
614 | ||
1da177e4 LT |
615 | /* ********************************************************************** * |
616 | * the interrupt related routines * | |
617 | * ********************************************************************** */ | |
618 | ||
619 | static void sci_transmit_chars(struct uart_port *port) | |
620 | { | |
ebd2c8f6 | 621 | struct circ_buf *xmit = &port->state->xmit; |
1da177e4 | 622 | unsigned int stopped = uart_tx_stopped(port); |
1da177e4 LT |
623 | unsigned short status; |
624 | unsigned short ctrl; | |
e108b2ca | 625 | int count; |
1da177e4 | 626 | |
b12bb29f | 627 | status = serial_port_in(port, SCxSR); |
1da177e4 | 628 | if (!(status & SCxSR_TDxE(port))) { |
b12bb29f | 629 | ctrl = serial_port_in(port, SCSCR); |
e7c98dc7 | 630 | if (uart_circ_empty(xmit)) |
8e698614 | 631 | ctrl &= ~SCSCR_TIE; |
e7c98dc7 | 632 | else |
8e698614 | 633 | ctrl |= SCSCR_TIE; |
b12bb29f | 634 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
635 | return; |
636 | } | |
637 | ||
72b294cf | 638 | count = sci_txroom(port); |
1da177e4 LT |
639 | |
640 | do { | |
641 | unsigned char c; | |
642 | ||
643 | if (port->x_char) { | |
644 | c = port->x_char; | |
645 | port->x_char = 0; | |
646 | } else if (!uart_circ_empty(xmit) && !stopped) { | |
647 | c = xmit->buf[xmit->tail]; | |
648 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
649 | } else { | |
650 | break; | |
651 | } | |
652 | ||
b12bb29f | 653 | serial_port_out(port, SCxTDR, c); |
1da177e4 LT |
654 | |
655 | port->icount.tx++; | |
656 | } while (--count > 0); | |
657 | ||
b12bb29f | 658 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); |
1da177e4 LT |
659 | |
660 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
661 | uart_write_wakeup(port); | |
662 | if (uart_circ_empty(xmit)) { | |
b129a8cc | 663 | sci_stop_tx(port); |
1da177e4 | 664 | } else { |
b12bb29f | 665 | ctrl = serial_port_in(port, SCSCR); |
1da177e4 | 666 | |
1a22f08d | 667 | if (port->type != PORT_SCI) { |
b12bb29f PM |
668 | serial_port_in(port, SCxSR); /* Dummy read */ |
669 | serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); | |
1da177e4 | 670 | } |
1da177e4 | 671 | |
8e698614 | 672 | ctrl |= SCSCR_TIE; |
b12bb29f | 673 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
674 | } |
675 | } | |
676 | ||
677 | /* On SH3, SCIF may read end-of-break as a space->mark char */ | |
e7c98dc7 | 678 | #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); }) |
1da177e4 | 679 | |
94c8b6db | 680 | static void sci_receive_chars(struct uart_port *port) |
1da177e4 | 681 | { |
e7c98dc7 | 682 | struct sci_port *sci_port = to_sci_port(port); |
227434f8 | 683 | struct tty_port *tport = &port->state->port; |
1da177e4 LT |
684 | int i, count, copied = 0; |
685 | unsigned short status; | |
33f0f88f | 686 | unsigned char flag; |
1da177e4 | 687 | |
b12bb29f | 688 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
689 | if (!(status & SCxSR_RDxF(port))) |
690 | return; | |
691 | ||
692 | while (1) { | |
1da177e4 | 693 | /* Don't copy more bytes than there is room for in the buffer */ |
227434f8 | 694 | count = tty_buffer_request_room(tport, sci_rxfill(port)); |
1da177e4 LT |
695 | |
696 | /* If for any reason we can't copy more data, we're done! */ | |
697 | if (count == 0) | |
698 | break; | |
699 | ||
700 | if (port->type == PORT_SCI) { | |
b12bb29f | 701 | char c = serial_port_in(port, SCxRDR); |
e7c98dc7 MT |
702 | if (uart_handle_sysrq_char(port, c) || |
703 | sci_port->break_flag) | |
1da177e4 | 704 | count = 0; |
e7c98dc7 | 705 | else |
92a19f9c | 706 | tty_insert_flip_char(tport, c, TTY_NORMAL); |
1da177e4 | 707 | } else { |
e7c98dc7 | 708 | for (i = 0; i < count; i++) { |
b12bb29f | 709 | char c = serial_port_in(port, SCxRDR); |
d97fbbed | 710 | |
b12bb29f | 711 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
712 | #if defined(CONFIG_CPU_SH3) |
713 | /* Skip "chars" during break */ | |
e108b2ca | 714 | if (sci_port->break_flag) { |
1da177e4 LT |
715 | if ((c == 0) && |
716 | (status & SCxSR_FER(port))) { | |
717 | count--; i--; | |
718 | continue; | |
719 | } | |
e108b2ca | 720 | |
1da177e4 | 721 | /* Nonzero => end-of-break */ |
762c69e3 | 722 | dev_dbg(port->dev, "debounce<%02x>\n", c); |
e108b2ca PM |
723 | sci_port->break_flag = 0; |
724 | ||
1da177e4 LT |
725 | if (STEPFN(c)) { |
726 | count--; i--; | |
727 | continue; | |
728 | } | |
729 | } | |
730 | #endif /* CONFIG_CPU_SH3 */ | |
7d12e780 | 731 | if (uart_handle_sysrq_char(port, c)) { |
1da177e4 LT |
732 | count--; i--; |
733 | continue; | |
734 | } | |
735 | ||
736 | /* Store data and status */ | |
73a19e4c | 737 | if (status & SCxSR_FER(port)) { |
33f0f88f | 738 | flag = TTY_FRAME; |
d97fbbed | 739 | port->icount.frame++; |
762c69e3 | 740 | dev_notice(port->dev, "frame error\n"); |
73a19e4c | 741 | } else if (status & SCxSR_PER(port)) { |
33f0f88f | 742 | flag = TTY_PARITY; |
d97fbbed | 743 | port->icount.parity++; |
762c69e3 | 744 | dev_notice(port->dev, "parity error\n"); |
33f0f88f AC |
745 | } else |
746 | flag = TTY_NORMAL; | |
762c69e3 | 747 | |
92a19f9c | 748 | tty_insert_flip_char(tport, c, flag); |
1da177e4 LT |
749 | } |
750 | } | |
751 | ||
b12bb29f PM |
752 | serial_port_in(port, SCxSR); /* dummy read */ |
753 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); | |
1da177e4 | 754 | |
1da177e4 LT |
755 | copied += count; |
756 | port->icount.rx += count; | |
757 | } | |
758 | ||
759 | if (copied) { | |
760 | /* Tell the rest of the system the news. New characters! */ | |
2e124b4a | 761 | tty_flip_buffer_push(tport); |
1da177e4 | 762 | } else { |
b12bb29f PM |
763 | serial_port_in(port, SCxSR); /* dummy read */ |
764 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); | |
1da177e4 LT |
765 | } |
766 | } | |
767 | ||
768 | #define SCI_BREAK_JIFFIES (HZ/20) | |
94c8b6db PM |
769 | |
770 | /* | |
771 | * The sci generates interrupts during the break, | |
1da177e4 LT |
772 | * 1 per millisecond or so during the break period, for 9600 baud. |
773 | * So dont bother disabling interrupts. | |
774 | * But dont want more than 1 break event. | |
775 | * Use a kernel timer to periodically poll the rx line until | |
776 | * the break is finished. | |
777 | */ | |
94c8b6db | 778 | static inline void sci_schedule_break_timer(struct sci_port *port) |
1da177e4 | 779 | { |
bc9b3f5c | 780 | mod_timer(&port->break_timer, jiffies + SCI_BREAK_JIFFIES); |
1da177e4 | 781 | } |
94c8b6db | 782 | |
1da177e4 LT |
783 | /* Ensure that two consecutive samples find the break over. */ |
784 | static void sci_break_timer(unsigned long data) | |
785 | { | |
e108b2ca PM |
786 | struct sci_port *port = (struct sci_port *)data; |
787 | ||
788 | if (sci_rxd_in(&port->port) == 0) { | |
1da177e4 | 789 | port->break_flag = 1; |
e108b2ca PM |
790 | sci_schedule_break_timer(port); |
791 | } else if (port->break_flag == 1) { | |
1da177e4 LT |
792 | /* break is over. */ |
793 | port->break_flag = 2; | |
e108b2ca PM |
794 | sci_schedule_break_timer(port); |
795 | } else | |
796 | port->break_flag = 0; | |
1da177e4 LT |
797 | } |
798 | ||
94c8b6db | 799 | static int sci_handle_errors(struct uart_port *port) |
1da177e4 LT |
800 | { |
801 | int copied = 0; | |
b12bb29f | 802 | unsigned short status = serial_port_in(port, SCxSR); |
92a19f9c | 803 | struct tty_port *tport = &port->state->port; |
debf9507 | 804 | struct sci_port *s = to_sci_port(port); |
1da177e4 | 805 | |
3ae988d9 | 806 | /* Handle overruns */ |
75c249fd | 807 | if (status & s->overrun_mask) { |
3ae988d9 | 808 | port->icount.overrun++; |
d97fbbed | 809 | |
3ae988d9 LP |
810 | /* overrun error */ |
811 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN)) | |
812 | copied++; | |
762c69e3 | 813 | |
9b971cd2 | 814 | dev_notice(port->dev, "overrun error\n"); |
1da177e4 LT |
815 | } |
816 | ||
e108b2ca | 817 | if (status & SCxSR_FER(port)) { |
1da177e4 LT |
818 | if (sci_rxd_in(port) == 0) { |
819 | /* Notify of BREAK */ | |
e7c98dc7 | 820 | struct sci_port *sci_port = to_sci_port(port); |
e108b2ca PM |
821 | |
822 | if (!sci_port->break_flag) { | |
d97fbbed PM |
823 | port->icount.brk++; |
824 | ||
e108b2ca PM |
825 | sci_port->break_flag = 1; |
826 | sci_schedule_break_timer(sci_port); | |
827 | ||
1da177e4 | 828 | /* Do sysrq handling. */ |
e108b2ca | 829 | if (uart_handle_break(port)) |
1da177e4 | 830 | return 0; |
762c69e3 PM |
831 | |
832 | dev_dbg(port->dev, "BREAK detected\n"); | |
833 | ||
92a19f9c | 834 | if (tty_insert_flip_char(tport, 0, TTY_BREAK)) |
e7c98dc7 MT |
835 | copied++; |
836 | } | |
837 | ||
e108b2ca | 838 | } else { |
1da177e4 | 839 | /* frame error */ |
d97fbbed PM |
840 | port->icount.frame++; |
841 | ||
92a19f9c | 842 | if (tty_insert_flip_char(tport, 0, TTY_FRAME)) |
33f0f88f | 843 | copied++; |
762c69e3 PM |
844 | |
845 | dev_notice(port->dev, "frame error\n"); | |
1da177e4 LT |
846 | } |
847 | } | |
848 | ||
e108b2ca | 849 | if (status & SCxSR_PER(port)) { |
1da177e4 | 850 | /* parity error */ |
d97fbbed PM |
851 | port->icount.parity++; |
852 | ||
92a19f9c | 853 | if (tty_insert_flip_char(tport, 0, TTY_PARITY)) |
e108b2ca | 854 | copied++; |
762c69e3 | 855 | |
9b971cd2 | 856 | dev_notice(port->dev, "parity error\n"); |
1da177e4 LT |
857 | } |
858 | ||
33f0f88f | 859 | if (copied) |
2e124b4a | 860 | tty_flip_buffer_push(tport); |
1da177e4 LT |
861 | |
862 | return copied; | |
863 | } | |
864 | ||
94c8b6db | 865 | static int sci_handle_fifo_overrun(struct uart_port *port) |
d830fa45 | 866 | { |
92a19f9c | 867 | struct tty_port *tport = &port->state->port; |
debf9507 | 868 | struct sci_port *s = to_sci_port(port); |
4b8c59a3 | 869 | struct plat_sci_reg *reg; |
2e0842a1 | 870 | int copied = 0; |
75c249fd | 871 | u16 status; |
d830fa45 | 872 | |
2e0842a1 | 873 | reg = sci_getreg(port, s->overrun_reg); |
4b8c59a3 | 874 | if (!reg->size) |
d830fa45 PM |
875 | return 0; |
876 | ||
2e0842a1 | 877 | status = serial_port_in(port, s->overrun_reg); |
75c249fd GU |
878 | if (status & s->overrun_mask) { |
879 | status &= ~s->overrun_mask; | |
2e0842a1 | 880 | serial_port_out(port, s->overrun_reg, status); |
d830fa45 | 881 | |
d97fbbed PM |
882 | port->icount.overrun++; |
883 | ||
92a19f9c | 884 | tty_insert_flip_char(tport, 0, TTY_OVERRUN); |
2e124b4a | 885 | tty_flip_buffer_push(tport); |
d830fa45 | 886 | |
51b31f1c | 887 | dev_dbg(port->dev, "overrun error\n"); |
d830fa45 PM |
888 | copied++; |
889 | } | |
890 | ||
891 | return copied; | |
892 | } | |
893 | ||
94c8b6db | 894 | static int sci_handle_breaks(struct uart_port *port) |
1da177e4 LT |
895 | { |
896 | int copied = 0; | |
b12bb29f | 897 | unsigned short status = serial_port_in(port, SCxSR); |
92a19f9c | 898 | struct tty_port *tport = &port->state->port; |
a5660ada | 899 | struct sci_port *s = to_sci_port(port); |
1da177e4 | 900 | |
0b3d4ef6 PM |
901 | if (uart_handle_break(port)) |
902 | return 0; | |
903 | ||
b7a76e4b | 904 | if (!s->break_flag && status & SCxSR_BRK(port)) { |
1da177e4 LT |
905 | #if defined(CONFIG_CPU_SH3) |
906 | /* Debounce break */ | |
907 | s->break_flag = 1; | |
908 | #endif | |
d97fbbed PM |
909 | |
910 | port->icount.brk++; | |
911 | ||
1da177e4 | 912 | /* Notify of BREAK */ |
92a19f9c | 913 | if (tty_insert_flip_char(tport, 0, TTY_BREAK)) |
33f0f88f | 914 | copied++; |
762c69e3 PM |
915 | |
916 | dev_dbg(port->dev, "BREAK detected\n"); | |
1da177e4 LT |
917 | } |
918 | ||
33f0f88f | 919 | if (copied) |
2e124b4a | 920 | tty_flip_buffer_push(tport); |
e108b2ca | 921 | |
d830fa45 PM |
922 | copied += sci_handle_fifo_overrun(port); |
923 | ||
1da177e4 LT |
924 | return copied; |
925 | } | |
926 | ||
73a19e4c | 927 | static irqreturn_t sci_rx_interrupt(int irq, void *ptr) |
1da177e4 | 928 | { |
73a19e4c GL |
929 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
930 | struct uart_port *port = ptr; | |
931 | struct sci_port *s = to_sci_port(port); | |
932 | ||
933 | if (s->chan_rx) { | |
b12bb29f PM |
934 | u16 scr = serial_port_in(port, SCSCR); |
935 | u16 ssr = serial_port_in(port, SCxSR); | |
73a19e4c GL |
936 | |
937 | /* Disable future Rx interrupts */ | |
d1d4b10c | 938 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
3089f381 | 939 | disable_irq_nosync(irq); |
26de4f1b | 940 | scr |= SCSCR_RDRQE; |
3089f381 | 941 | } else { |
f43dc23d | 942 | scr &= ~SCSCR_RIE; |
3089f381 | 943 | } |
b12bb29f | 944 | serial_port_out(port, SCSCR, scr); |
73a19e4c | 945 | /* Clear current interrupt */ |
b12bb29f | 946 | serial_port_out(port, SCxSR, ssr & ~(1 | SCxSR_RDxF(port))); |
3089f381 GL |
947 | dev_dbg(port->dev, "Rx IRQ %lu: setup t-out in %u jiffies\n", |
948 | jiffies, s->rx_timeout); | |
949 | mod_timer(&s->rx_timer, jiffies + s->rx_timeout); | |
73a19e4c GL |
950 | |
951 | return IRQ_HANDLED; | |
952 | } | |
953 | #endif | |
954 | ||
1da177e4 LT |
955 | /* I think sci_receive_chars has to be called irrespective |
956 | * of whether the I_IXOFF is set, otherwise, how is the interrupt | |
957 | * to be disabled? | |
958 | */ | |
73a19e4c | 959 | sci_receive_chars(ptr); |
1da177e4 LT |
960 | |
961 | return IRQ_HANDLED; | |
962 | } | |
963 | ||
7d12e780 | 964 | static irqreturn_t sci_tx_interrupt(int irq, void *ptr) |
1da177e4 LT |
965 | { |
966 | struct uart_port *port = ptr; | |
fd78a76a | 967 | unsigned long flags; |
1da177e4 | 968 | |
fd78a76a | 969 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 970 | sci_transmit_chars(port); |
fd78a76a | 971 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
972 | |
973 | return IRQ_HANDLED; | |
974 | } | |
975 | ||
7d12e780 | 976 | static irqreturn_t sci_er_interrupt(int irq, void *ptr) |
1da177e4 LT |
977 | { |
978 | struct uart_port *port = ptr; | |
979 | ||
980 | /* Handle errors */ | |
981 | if (port->type == PORT_SCI) { | |
982 | if (sci_handle_errors(port)) { | |
983 | /* discard character in rx buffer */ | |
b12bb29f PM |
984 | serial_port_in(port, SCxSR); |
985 | serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); | |
1da177e4 LT |
986 | } |
987 | } else { | |
d830fa45 | 988 | sci_handle_fifo_overrun(port); |
7d12e780 | 989 | sci_rx_interrupt(irq, ptr); |
1da177e4 LT |
990 | } |
991 | ||
b12bb29f | 992 | serial_port_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); |
1da177e4 LT |
993 | |
994 | /* Kick the transmission */ | |
7d12e780 | 995 | sci_tx_interrupt(irq, ptr); |
1da177e4 LT |
996 | |
997 | return IRQ_HANDLED; | |
998 | } | |
999 | ||
7d12e780 | 1000 | static irqreturn_t sci_br_interrupt(int irq, void *ptr) |
1da177e4 LT |
1001 | { |
1002 | struct uart_port *port = ptr; | |
1003 | ||
1004 | /* Handle BREAKs */ | |
1005 | sci_handle_breaks(port); | |
b12bb29f | 1006 | serial_port_out(port, SCxSR, SCxSR_BREAK_CLEAR(port)); |
1da177e4 LT |
1007 | |
1008 | return IRQ_HANDLED; | |
1009 | } | |
1010 | ||
f43dc23d PM |
1011 | static inline unsigned long port_rx_irq_mask(struct uart_port *port) |
1012 | { | |
1013 | /* | |
1014 | * Not all ports (such as SCIFA) will support REIE. Rather than | |
1015 | * special-casing the port type, we check the port initialization | |
1016 | * IRQ enable mask to see whether the IRQ is desired at all. If | |
1017 | * it's unset, it's logically inferred that there's no point in | |
1018 | * testing for it. | |
1019 | */ | |
ce6738b6 | 1020 | return SCSCR_RIE | (to_sci_port(port)->cfg->scscr & SCSCR_REIE); |
f43dc23d PM |
1021 | } |
1022 | ||
7d12e780 | 1023 | static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) |
1da177e4 | 1024 | { |
cb772fe7 | 1025 | unsigned short ssr_status, scr_status, err_enabled, orer_status = 0; |
a8884e34 | 1026 | struct uart_port *port = ptr; |
73a19e4c | 1027 | struct sci_port *s = to_sci_port(port); |
a8884e34 | 1028 | irqreturn_t ret = IRQ_NONE; |
1da177e4 | 1029 | |
b12bb29f PM |
1030 | ssr_status = serial_port_in(port, SCxSR); |
1031 | scr_status = serial_port_in(port, SCSCR); | |
2e0842a1 | 1032 | if (s->overrun_reg == SCxSR) |
cb772fe7 | 1033 | orer_status = ssr_status; |
2e0842a1 GU |
1034 | else { |
1035 | if (sci_getreg(port, s->overrun_reg)->size) | |
1036 | orer_status = serial_port_in(port, s->overrun_reg); | |
cb772fe7 NI |
1037 | } |
1038 | ||
f43dc23d | 1039 | err_enabled = scr_status & port_rx_irq_mask(port); |
1da177e4 LT |
1040 | |
1041 | /* Tx Interrupt */ | |
f43dc23d | 1042 | if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCSCR_TIE) && |
73a19e4c | 1043 | !s->chan_tx) |
a8884e34 | 1044 | ret = sci_tx_interrupt(irq, ptr); |
f43dc23d | 1045 | |
73a19e4c GL |
1046 | /* |
1047 | * Rx Interrupt: if we're using DMA, the DMA controller clears RDF / | |
1048 | * DR flags | |
1049 | */ | |
1050 | if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) && | |
8b6ff84c HN |
1051 | (scr_status & SCSCR_RIE)) { |
1052 | if (port->type == PORT_SCIF || port->type == PORT_HSCIF) | |
1053 | sci_handle_fifo_overrun(port); | |
a8884e34 | 1054 | ret = sci_rx_interrupt(irq, ptr); |
8b6ff84c | 1055 | } |
f43dc23d | 1056 | |
1da177e4 | 1057 | /* Error Interrupt */ |
dd4da3a5 | 1058 | if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled) |
a8884e34 | 1059 | ret = sci_er_interrupt(irq, ptr); |
f43dc23d | 1060 | |
1da177e4 | 1061 | /* Break Interrupt */ |
dd4da3a5 | 1062 | if ((ssr_status & SCxSR_BRK(port)) && err_enabled) |
a8884e34 | 1063 | ret = sci_br_interrupt(irq, ptr); |
1da177e4 | 1064 | |
8b6ff84c | 1065 | /* Overrun Interrupt */ |
75c249fd | 1066 | if (orer_status & s->overrun_mask) |
cb772fe7 | 1067 | sci_handle_fifo_overrun(port); |
8b6ff84c | 1068 | |
a8884e34 | 1069 | return ret; |
1da177e4 LT |
1070 | } |
1071 | ||
1da177e4 | 1072 | /* |
25985edc | 1073 | * Here we define a transition notifier so that we can update all of our |
1da177e4 LT |
1074 | * ports' baud rate when the peripheral clock changes. |
1075 | */ | |
e108b2ca PM |
1076 | static int sci_notifier(struct notifier_block *self, |
1077 | unsigned long phase, void *p) | |
1da177e4 | 1078 | { |
e552de24 MD |
1079 | struct sci_port *sci_port; |
1080 | unsigned long flags; | |
1da177e4 | 1081 | |
d535a230 PM |
1082 | sci_port = container_of(self, struct sci_port, freq_transition); |
1083 | ||
0b443ead | 1084 | if (phase == CPUFREQ_POSTCHANGE) { |
d535a230 | 1085 | struct uart_port *port = &sci_port->port; |
073e84c9 | 1086 | |
d535a230 PM |
1087 | spin_lock_irqsave(&port->lock, flags); |
1088 | port->uartclk = clk_get_rate(sci_port->iclk); | |
1089 | spin_unlock_irqrestore(&port->lock, flags); | |
e552de24 | 1090 | } |
1da177e4 | 1091 | |
1da177e4 LT |
1092 | return NOTIFY_OK; |
1093 | } | |
501b825d | 1094 | |
9174fc8f PM |
1095 | static struct sci_irq_desc { |
1096 | const char *desc; | |
1097 | irq_handler_t handler; | |
1098 | } sci_irq_desc[] = { | |
1099 | /* | |
1100 | * Split out handlers, the default case. | |
1101 | */ | |
1102 | [SCIx_ERI_IRQ] = { | |
1103 | .desc = "rx err", | |
1104 | .handler = sci_er_interrupt, | |
1105 | }, | |
1106 | ||
1107 | [SCIx_RXI_IRQ] = { | |
1108 | .desc = "rx full", | |
1109 | .handler = sci_rx_interrupt, | |
1110 | }, | |
1111 | ||
1112 | [SCIx_TXI_IRQ] = { | |
1113 | .desc = "tx empty", | |
1114 | .handler = sci_tx_interrupt, | |
1115 | }, | |
1116 | ||
1117 | [SCIx_BRI_IRQ] = { | |
1118 | .desc = "break", | |
1119 | .handler = sci_br_interrupt, | |
1120 | }, | |
1121 | ||
1122 | /* | |
1123 | * Special muxed handler. | |
1124 | */ | |
1125 | [SCIx_MUX_IRQ] = { | |
1126 | .desc = "mux", | |
1127 | .handler = sci_mpxed_interrupt, | |
1128 | }, | |
1129 | }; | |
1130 | ||
1da177e4 LT |
1131 | static int sci_request_irq(struct sci_port *port) |
1132 | { | |
9174fc8f PM |
1133 | struct uart_port *up = &port->port; |
1134 | int i, j, ret = 0; | |
1135 | ||
1136 | for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) { | |
1137 | struct sci_irq_desc *desc; | |
1fcc91a6 | 1138 | int irq; |
9174fc8f PM |
1139 | |
1140 | if (SCIx_IRQ_IS_MUXED(port)) { | |
1141 | i = SCIx_MUX_IRQ; | |
1142 | irq = up->irq; | |
0e8963de | 1143 | } else { |
1fcc91a6 | 1144 | irq = port->irqs[i]; |
9174fc8f | 1145 | |
0e8963de PM |
1146 | /* |
1147 | * Certain port types won't support all of the | |
1148 | * available interrupt sources. | |
1149 | */ | |
1fcc91a6 | 1150 | if (unlikely(irq < 0)) |
0e8963de PM |
1151 | continue; |
1152 | } | |
1153 | ||
9174fc8f PM |
1154 | desc = sci_irq_desc + i; |
1155 | port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s", | |
1156 | dev_name(up->dev), desc->desc); | |
1157 | if (!port->irqstr[j]) { | |
1158 | dev_err(up->dev, "Failed to allocate %s IRQ string\n", | |
1159 | desc->desc); | |
1160 | goto out_nomem; | |
1da177e4 | 1161 | } |
9174fc8f PM |
1162 | |
1163 | ret = request_irq(irq, desc->handler, up->irqflags, | |
1164 | port->irqstr[j], port); | |
1165 | if (unlikely(ret)) { | |
1166 | dev_err(up->dev, "Can't allocate %s IRQ\n", desc->desc); | |
1167 | goto out_noirq; | |
1da177e4 LT |
1168 | } |
1169 | } | |
1170 | ||
1171 | return 0; | |
9174fc8f PM |
1172 | |
1173 | out_noirq: | |
1174 | while (--i >= 0) | |
1fcc91a6 | 1175 | free_irq(port->irqs[i], port); |
9174fc8f PM |
1176 | |
1177 | out_nomem: | |
1178 | while (--j >= 0) | |
1179 | kfree(port->irqstr[j]); | |
1180 | ||
1181 | return ret; | |
1da177e4 LT |
1182 | } |
1183 | ||
1184 | static void sci_free_irq(struct sci_port *port) | |
1185 | { | |
1186 | int i; | |
1187 | ||
9174fc8f PM |
1188 | /* |
1189 | * Intentionally in reverse order so we iterate over the muxed | |
1190 | * IRQ first. | |
1191 | */ | |
1192 | for (i = 0; i < SCIx_NR_IRQS; i++) { | |
1fcc91a6 | 1193 | int irq = port->irqs[i]; |
0e8963de PM |
1194 | |
1195 | /* | |
1196 | * Certain port types won't support all of the available | |
1197 | * interrupt sources. | |
1198 | */ | |
1fcc91a6 | 1199 | if (unlikely(irq < 0)) |
0e8963de PM |
1200 | continue; |
1201 | ||
1fcc91a6 | 1202 | free_irq(port->irqs[i], port); |
9174fc8f | 1203 | kfree(port->irqstr[i]); |
1da177e4 | 1204 | |
9174fc8f PM |
1205 | if (SCIx_IRQ_IS_MUXED(port)) { |
1206 | /* If there's only one IRQ, we're done. */ | |
1207 | return; | |
1da177e4 LT |
1208 | } |
1209 | } | |
1210 | } | |
1211 | ||
1212 | static unsigned int sci_tx_empty(struct uart_port *port) | |
1213 | { | |
b12bb29f | 1214 | unsigned short status = serial_port_in(port, SCxSR); |
72b294cf | 1215 | unsigned short in_tx_fifo = sci_txfill(port); |
73a19e4c GL |
1216 | |
1217 | return (status & SCxSR_TEND(port)) && !in_tx_fifo ? TIOCSER_TEMT : 0; | |
1da177e4 LT |
1218 | } |
1219 | ||
cdf7c42f PM |
1220 | /* |
1221 | * Modem control is a bit of a mixed bag for SCI(F) ports. Generally | |
1222 | * CTS/RTS is supported in hardware by at least one port and controlled | |
1223 | * via SCSPTR (SCxPCR for SCIFA/B parts), or external pins (presently | |
1224 | * handled via the ->init_pins() op, which is a bit of a one-way street, | |
1225 | * lacking any ability to defer pin control -- this will later be | |
1226 | * converted over to the GPIO framework). | |
dc7e3ef7 PM |
1227 | * |
1228 | * Other modes (such as loopback) are supported generically on certain | |
1229 | * port types, but not others. For these it's sufficient to test for the | |
1230 | * existence of the support register and simply ignore the port type. | |
cdf7c42f | 1231 | */ |
1da177e4 LT |
1232 | static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl) |
1233 | { | |
dc7e3ef7 PM |
1234 | if (mctrl & TIOCM_LOOP) { |
1235 | struct plat_sci_reg *reg; | |
1236 | ||
1237 | /* | |
1238 | * Standard loopback mode for SCFCR ports. | |
1239 | */ | |
1240 | reg = sci_getreg(port, SCFCR); | |
1241 | if (reg->size) | |
26de4f1b GU |
1242 | serial_port_out(port, SCFCR, |
1243 | serial_port_in(port, SCFCR) | | |
1244 | SCFCR_LOOP); | |
dc7e3ef7 | 1245 | } |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | static unsigned int sci_get_mctrl(struct uart_port *port) | |
1249 | { | |
cdf7c42f PM |
1250 | /* |
1251 | * CTS/RTS is handled in hardware when supported, while nothing | |
1252 | * else is wired up. Keep it simple and simply assert DSR/CAR. | |
1253 | */ | |
1254 | return TIOCM_DSR | TIOCM_CAR; | |
1da177e4 LT |
1255 | } |
1256 | ||
73a19e4c GL |
1257 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
1258 | static void sci_dma_tx_complete(void *arg) | |
1259 | { | |
1260 | struct sci_port *s = arg; | |
1261 | struct uart_port *port = &s->port; | |
1262 | struct circ_buf *xmit = &port->state->xmit; | |
1263 | unsigned long flags; | |
1264 | ||
1265 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); | |
1266 | ||
1267 | spin_lock_irqsave(&port->lock, flags); | |
1268 | ||
f354a381 | 1269 | xmit->tail += sg_dma_len(&s->sg_tx); |
73a19e4c GL |
1270 | xmit->tail &= UART_XMIT_SIZE - 1; |
1271 | ||
f354a381 | 1272 | port->icount.tx += sg_dma_len(&s->sg_tx); |
73a19e4c GL |
1273 | |
1274 | async_tx_ack(s->desc_tx); | |
73a19e4c GL |
1275 | s->desc_tx = NULL; |
1276 | ||
73a19e4c GL |
1277 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
1278 | uart_write_wakeup(port); | |
1279 | ||
3089f381 | 1280 | if (!uart_circ_empty(xmit)) { |
49d4bcad | 1281 | s->cookie_tx = 0; |
73a19e4c | 1282 | schedule_work(&s->work_tx); |
49d4bcad YT |
1283 | } else { |
1284 | s->cookie_tx = -EINVAL; | |
1285 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
b12bb29f PM |
1286 | u16 ctrl = serial_port_in(port, SCSCR); |
1287 | serial_port_out(port, SCSCR, ctrl & ~SCSCR_TIE); | |
49d4bcad | 1288 | } |
3089f381 GL |
1289 | } |
1290 | ||
1291 | spin_unlock_irqrestore(&port->lock, flags); | |
73a19e4c GL |
1292 | } |
1293 | ||
1294 | /* Locking: called with port lock held */ | |
92a19f9c | 1295 | static int sci_dma_rx_push(struct sci_port *s, size_t count) |
73a19e4c GL |
1296 | { |
1297 | struct uart_port *port = &s->port; | |
227434f8 | 1298 | struct tty_port *tport = &port->state->port; |
73a19e4c GL |
1299 | int i, active, room; |
1300 | ||
227434f8 | 1301 | room = tty_buffer_request_room(tport, count); |
73a19e4c GL |
1302 | |
1303 | if (s->active_rx == s->cookie_rx[0]) { | |
1304 | active = 0; | |
1305 | } else if (s->active_rx == s->cookie_rx[1]) { | |
1306 | active = 1; | |
1307 | } else { | |
1308 | dev_err(port->dev, "cookie %d not found!\n", s->active_rx); | |
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | if (room < count) | |
e2afca69 | 1313 | dev_warn(port->dev, "Rx overrun: dropping %zu bytes\n", |
73a19e4c GL |
1314 | count - room); |
1315 | if (!room) | |
1316 | return room; | |
1317 | ||
1318 | for (i = 0; i < room; i++) | |
92a19f9c | 1319 | tty_insert_flip_char(tport, ((u8 *)sg_virt(&s->sg_rx[active]))[i], |
73a19e4c GL |
1320 | TTY_NORMAL); |
1321 | ||
1322 | port->icount.rx += room; | |
1323 | ||
1324 | return room; | |
1325 | } | |
1326 | ||
1327 | static void sci_dma_rx_complete(void *arg) | |
1328 | { | |
1329 | struct sci_port *s = arg; | |
1330 | struct uart_port *port = &s->port; | |
73a19e4c GL |
1331 | unsigned long flags; |
1332 | int count; | |
1333 | ||
9b971cd2 JP |
1334 | dev_dbg(port->dev, "%s(%d) active #%d\n", |
1335 | __func__, port->line, s->active_rx); | |
73a19e4c GL |
1336 | |
1337 | spin_lock_irqsave(&port->lock, flags); | |
1338 | ||
92a19f9c | 1339 | count = sci_dma_rx_push(s, s->buf_len_rx); |
73a19e4c | 1340 | |
3089f381 | 1341 | mod_timer(&s->rx_timer, jiffies + s->rx_timeout); |
73a19e4c GL |
1342 | |
1343 | spin_unlock_irqrestore(&port->lock, flags); | |
1344 | ||
1345 | if (count) | |
2e124b4a | 1346 | tty_flip_buffer_push(&port->state->port); |
73a19e4c GL |
1347 | |
1348 | schedule_work(&s->work_rx); | |
1349 | } | |
1350 | ||
73a19e4c GL |
1351 | static void sci_rx_dma_release(struct sci_port *s, bool enable_pio) |
1352 | { | |
1353 | struct dma_chan *chan = s->chan_rx; | |
1354 | struct uart_port *port = &s->port; | |
73a19e4c GL |
1355 | |
1356 | s->chan_rx = NULL; | |
1357 | s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL; | |
1358 | dma_release_channel(chan); | |
85b8e3ff GL |
1359 | if (sg_dma_address(&s->sg_rx[0])) |
1360 | dma_free_coherent(port->dev, s->buf_len_rx * 2, | |
1361 | sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0])); | |
73a19e4c GL |
1362 | if (enable_pio) |
1363 | sci_start_rx(port); | |
1364 | } | |
1365 | ||
1366 | static void sci_tx_dma_release(struct sci_port *s, bool enable_pio) | |
1367 | { | |
1368 | struct dma_chan *chan = s->chan_tx; | |
1369 | struct uart_port *port = &s->port; | |
73a19e4c GL |
1370 | |
1371 | s->chan_tx = NULL; | |
1372 | s->cookie_tx = -EINVAL; | |
1373 | dma_release_channel(chan); | |
1374 | if (enable_pio) | |
1375 | sci_start_tx(port); | |
1376 | } | |
1377 | ||
1378 | static void sci_submit_rx(struct sci_port *s) | |
1379 | { | |
1380 | struct dma_chan *chan = s->chan_rx; | |
1381 | int i; | |
1382 | ||
1383 | for (i = 0; i < 2; i++) { | |
1384 | struct scatterlist *sg = &s->sg_rx[i]; | |
1385 | struct dma_async_tx_descriptor *desc; | |
1386 | ||
16052827 | 1387 | desc = dmaengine_prep_slave_sg(chan, |
a485df4b | 1388 | sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); |
73a19e4c GL |
1389 | |
1390 | if (desc) { | |
1391 | s->desc_rx[i] = desc; | |
1392 | desc->callback = sci_dma_rx_complete; | |
1393 | desc->callback_param = s; | |
1394 | s->cookie_rx[i] = desc->tx_submit(desc); | |
1395 | } | |
1396 | ||
1397 | if (!desc || s->cookie_rx[i] < 0) { | |
1398 | if (i) { | |
1399 | async_tx_ack(s->desc_rx[0]); | |
1400 | s->cookie_rx[0] = -EINVAL; | |
1401 | } | |
1402 | if (desc) { | |
1403 | async_tx_ack(desc); | |
1404 | s->cookie_rx[i] = -EINVAL; | |
1405 | } | |
1406 | dev_warn(s->port.dev, | |
1407 | "failed to re-start DMA, using PIO\n"); | |
1408 | sci_rx_dma_release(s, true); | |
1409 | return; | |
1410 | } | |
9b971cd2 JP |
1411 | dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n", |
1412 | __func__, s->cookie_rx[i], i); | |
73a19e4c GL |
1413 | } |
1414 | ||
1415 | s->active_rx = s->cookie_rx[0]; | |
1416 | ||
1417 | dma_async_issue_pending(chan); | |
1418 | } | |
1419 | ||
1420 | static void work_fn_rx(struct work_struct *work) | |
1421 | { | |
1422 | struct sci_port *s = container_of(work, struct sci_port, work_rx); | |
1423 | struct uart_port *port = &s->port; | |
1424 | struct dma_async_tx_descriptor *desc; | |
1425 | int new; | |
1426 | ||
1427 | if (s->active_rx == s->cookie_rx[0]) { | |
1428 | new = 0; | |
1429 | } else if (s->active_rx == s->cookie_rx[1]) { | |
1430 | new = 1; | |
1431 | } else { | |
1432 | dev_err(port->dev, "cookie %d not found!\n", s->active_rx); | |
1433 | return; | |
1434 | } | |
1435 | desc = s->desc_rx[new]; | |
1436 | ||
1437 | if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) != | |
0b3d7d39 | 1438 | DMA_COMPLETE) { |
73a19e4c | 1439 | /* Handle incomplete DMA receive */ |
73a19e4c | 1440 | struct dma_chan *chan = s->chan_rx; |
4dc4c516 GL |
1441 | struct shdma_desc *sh_desc = container_of(desc, |
1442 | struct shdma_desc, async_tx); | |
73a19e4c GL |
1443 | unsigned long flags; |
1444 | int count; | |
1445 | ||
2bcd90d5 | 1446 | dmaengine_terminate_all(chan); |
e2afca69 | 1447 | dev_dbg(port->dev, "Read %zu bytes with cookie %d\n", |
73a19e4c GL |
1448 | sh_desc->partial, sh_desc->cookie); |
1449 | ||
1450 | spin_lock_irqsave(&port->lock, flags); | |
92a19f9c | 1451 | count = sci_dma_rx_push(s, sh_desc->partial); |
73a19e4c GL |
1452 | spin_unlock_irqrestore(&port->lock, flags); |
1453 | ||
1454 | if (count) | |
2e124b4a | 1455 | tty_flip_buffer_push(&port->state->port); |
73a19e4c GL |
1456 | |
1457 | sci_submit_rx(s); | |
1458 | ||
1459 | return; | |
1460 | } | |
1461 | ||
1462 | s->cookie_rx[new] = desc->tx_submit(desc); | |
1463 | if (s->cookie_rx[new] < 0) { | |
1464 | dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n"); | |
1465 | sci_rx_dma_release(s, true); | |
1466 | return; | |
1467 | } | |
1468 | ||
73a19e4c | 1469 | s->active_rx = s->cookie_rx[!new]; |
3089f381 | 1470 | |
9b971cd2 JP |
1471 | dev_dbg(port->dev, "%s: cookie %d #%d, new active #%d\n", |
1472 | __func__, s->cookie_rx[new], new, s->active_rx); | |
73a19e4c GL |
1473 | } |
1474 | ||
1475 | static void work_fn_tx(struct work_struct *work) | |
1476 | { | |
1477 | struct sci_port *s = container_of(work, struct sci_port, work_tx); | |
1478 | struct dma_async_tx_descriptor *desc; | |
1479 | struct dma_chan *chan = s->chan_tx; | |
1480 | struct uart_port *port = &s->port; | |
1481 | struct circ_buf *xmit = &port->state->xmit; | |
1482 | struct scatterlist *sg = &s->sg_tx; | |
1483 | ||
1484 | /* | |
1485 | * DMA is idle now. | |
1486 | * Port xmit buffer is already mapped, and it is one page... Just adjust | |
1487 | * offsets and lengths. Since it is a circular buffer, we have to | |
1488 | * transmit till the end, and then the rest. Take the port lock to get a | |
1489 | * consistent xmit buffer state. | |
1490 | */ | |
1491 | spin_lock_irq(&port->lock); | |
1492 | sg->offset = xmit->tail & (UART_XMIT_SIZE - 1); | |
f354a381 | 1493 | sg_dma_address(sg) = (sg_dma_address(sg) & ~(UART_XMIT_SIZE - 1)) + |
73a19e4c | 1494 | sg->offset; |
f354a381 | 1495 | sg_dma_len(sg) = min((int)CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE), |
73a19e4c | 1496 | CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE)); |
73a19e4c GL |
1497 | spin_unlock_irq(&port->lock); |
1498 | ||
f354a381 | 1499 | BUG_ON(!sg_dma_len(sg)); |
73a19e4c | 1500 | |
16052827 | 1501 | desc = dmaengine_prep_slave_sg(chan, |
a485df4b | 1502 | sg, s->sg_len_tx, DMA_MEM_TO_DEV, |
73a19e4c GL |
1503 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1504 | if (!desc) { | |
1505 | /* switch to PIO */ | |
1506 | sci_tx_dma_release(s, true); | |
1507 | return; | |
1508 | } | |
1509 | ||
1510 | dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE); | |
1511 | ||
1512 | spin_lock_irq(&port->lock); | |
1513 | s->desc_tx = desc; | |
1514 | desc->callback = sci_dma_tx_complete; | |
1515 | desc->callback_param = s; | |
1516 | spin_unlock_irq(&port->lock); | |
1517 | s->cookie_tx = desc->tx_submit(desc); | |
1518 | if (s->cookie_tx < 0) { | |
1519 | dev_warn(port->dev, "Failed submitting Tx DMA descriptor\n"); | |
1520 | /* switch to PIO */ | |
1521 | sci_tx_dma_release(s, true); | |
1522 | return; | |
1523 | } | |
1524 | ||
9b971cd2 JP |
1525 | dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", |
1526 | __func__, xmit->buf, xmit->tail, xmit->head, s->cookie_tx); | |
73a19e4c GL |
1527 | |
1528 | dma_async_issue_pending(chan); | |
1529 | } | |
1530 | #endif | |
1531 | ||
b129a8cc | 1532 | static void sci_start_tx(struct uart_port *port) |
1da177e4 | 1533 | { |
3089f381 | 1534 | struct sci_port *s = to_sci_port(port); |
e108b2ca | 1535 | unsigned short ctrl; |
1da177e4 | 1536 | |
73a19e4c | 1537 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
d1d4b10c | 1538 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
b12bb29f | 1539 | u16 new, scr = serial_port_in(port, SCSCR); |
3089f381 | 1540 | if (s->chan_tx) |
26de4f1b | 1541 | new = scr | SCSCR_TDRQE; |
3089f381 | 1542 | else |
26de4f1b | 1543 | new = scr & ~SCSCR_TDRQE; |
3089f381 | 1544 | if (new != scr) |
b12bb29f | 1545 | serial_port_out(port, SCSCR, new); |
73a19e4c | 1546 | } |
f43dc23d | 1547 | |
3089f381 | 1548 | if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) && |
49d4bcad YT |
1549 | s->cookie_tx < 0) { |
1550 | s->cookie_tx = 0; | |
3089f381 | 1551 | schedule_work(&s->work_tx); |
49d4bcad | 1552 | } |
73a19e4c | 1553 | #endif |
f43dc23d | 1554 | |
d1d4b10c | 1555 | if (!s->chan_tx || port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
3089f381 | 1556 | /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */ |
b12bb29f PM |
1557 | ctrl = serial_port_in(port, SCSCR); |
1558 | serial_port_out(port, SCSCR, ctrl | SCSCR_TIE); | |
3089f381 | 1559 | } |
1da177e4 LT |
1560 | } |
1561 | ||
b129a8cc | 1562 | static void sci_stop_tx(struct uart_port *port) |
1da177e4 | 1563 | { |
1da177e4 LT |
1564 | unsigned short ctrl; |
1565 | ||
1566 | /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */ | |
b12bb29f | 1567 | ctrl = serial_port_in(port, SCSCR); |
f43dc23d | 1568 | |
d1d4b10c | 1569 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
26de4f1b | 1570 | ctrl &= ~SCSCR_TDRQE; |
f43dc23d | 1571 | |
8e698614 | 1572 | ctrl &= ~SCSCR_TIE; |
f43dc23d | 1573 | |
b12bb29f | 1574 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
1575 | } |
1576 | ||
73a19e4c | 1577 | static void sci_start_rx(struct uart_port *port) |
1da177e4 | 1578 | { |
1da177e4 LT |
1579 | unsigned short ctrl; |
1580 | ||
b12bb29f | 1581 | ctrl = serial_port_in(port, SCSCR) | port_rx_irq_mask(port); |
1da177e4 | 1582 | |
d1d4b10c | 1583 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
26de4f1b | 1584 | ctrl &= ~SCSCR_RDRQE; |
f43dc23d | 1585 | |
b12bb29f | 1586 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
1587 | } |
1588 | ||
1589 | static void sci_stop_rx(struct uart_port *port) | |
1590 | { | |
1da177e4 LT |
1591 | unsigned short ctrl; |
1592 | ||
b12bb29f | 1593 | ctrl = serial_port_in(port, SCSCR); |
f43dc23d | 1594 | |
d1d4b10c | 1595 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
26de4f1b | 1596 | ctrl &= ~SCSCR_RDRQE; |
f43dc23d PM |
1597 | |
1598 | ctrl &= ~port_rx_irq_mask(port); | |
1599 | ||
b12bb29f | 1600 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
1601 | } |
1602 | ||
1da177e4 LT |
1603 | static void sci_break_ctl(struct uart_port *port, int break_state) |
1604 | { | |
bbb4ce50 | 1605 | struct sci_port *s = to_sci_port(port); |
a4e02f6d | 1606 | struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR; |
bbb4ce50 SY |
1607 | unsigned short scscr, scsptr; |
1608 | ||
a4e02f6d SY |
1609 | /* check wheter the port has SCSPTR */ |
1610 | if (!reg->size) { | |
bbb4ce50 SY |
1611 | /* |
1612 | * Not supported by hardware. Most parts couple break and rx | |
1613 | * interrupts together, with break detection always enabled. | |
1614 | */ | |
a4e02f6d | 1615 | return; |
bbb4ce50 | 1616 | } |
a4e02f6d SY |
1617 | |
1618 | scsptr = serial_port_in(port, SCSPTR); | |
1619 | scscr = serial_port_in(port, SCSCR); | |
1620 | ||
1621 | if (break_state == -1) { | |
1622 | scsptr = (scsptr | SCSPTR_SPB2IO) & ~SCSPTR_SPB2DT; | |
1623 | scscr &= ~SCSCR_TE; | |
1624 | } else { | |
1625 | scsptr = (scsptr | SCSPTR_SPB2DT) & ~SCSPTR_SPB2IO; | |
1626 | scscr |= SCSCR_TE; | |
1627 | } | |
1628 | ||
1629 | serial_port_out(port, SCSPTR, scsptr); | |
1630 | serial_port_out(port, SCSCR, scscr); | |
1da177e4 LT |
1631 | } |
1632 | ||
73a19e4c GL |
1633 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
1634 | static bool filter(struct dma_chan *chan, void *slave) | |
1635 | { | |
1636 | struct sh_dmae_slave *param = slave; | |
1637 | ||
9b971cd2 JP |
1638 | dev_dbg(chan->device->dev, "%s: slave ID %d\n", |
1639 | __func__, param->shdma_slave.slave_id); | |
73a19e4c | 1640 | |
d6fa5a4e | 1641 | chan->private = ¶m->shdma_slave; |
937bb6e4 | 1642 | return true; |
73a19e4c GL |
1643 | } |
1644 | ||
1645 | static void rx_timer_fn(unsigned long arg) | |
1646 | { | |
1647 | struct sci_port *s = (struct sci_port *)arg; | |
1648 | struct uart_port *port = &s->port; | |
b12bb29f | 1649 | u16 scr = serial_port_in(port, SCSCR); |
3089f381 | 1650 | |
d1d4b10c | 1651 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
26de4f1b | 1652 | scr &= ~SCSCR_RDRQE; |
1fcc91a6 | 1653 | enable_irq(s->irqs[SCIx_RXI_IRQ]); |
3089f381 | 1654 | } |
b12bb29f | 1655 | serial_port_out(port, SCSCR, scr | SCSCR_RIE); |
73a19e4c GL |
1656 | dev_dbg(port->dev, "DMA Rx timed out\n"); |
1657 | schedule_work(&s->work_rx); | |
1658 | } | |
1659 | ||
1660 | static void sci_request_dma(struct uart_port *port) | |
1661 | { | |
1662 | struct sci_port *s = to_sci_port(port); | |
1663 | struct sh_dmae_slave *param; | |
1664 | struct dma_chan *chan; | |
1665 | dma_cap_mask_t mask; | |
1666 | int nent; | |
1667 | ||
9b971cd2 | 1668 | dev_dbg(port->dev, "%s: port %d\n", __func__, port->line); |
73a19e4c | 1669 | |
937bb6e4 | 1670 | if (s->cfg->dma_slave_tx <= 0 || s->cfg->dma_slave_rx <= 0) |
73a19e4c GL |
1671 | return; |
1672 | ||
1673 | dma_cap_zero(mask); | |
1674 | dma_cap_set(DMA_SLAVE, mask); | |
1675 | ||
1676 | param = &s->param_tx; | |
1677 | ||
1678 | /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */ | |
d6fa5a4e | 1679 | param->shdma_slave.slave_id = s->cfg->dma_slave_tx; |
73a19e4c GL |
1680 | |
1681 | s->cookie_tx = -EINVAL; | |
1682 | chan = dma_request_channel(mask, filter, param); | |
1683 | dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan); | |
1684 | if (chan) { | |
1685 | s->chan_tx = chan; | |
1686 | sg_init_table(&s->sg_tx, 1); | |
1687 | /* UART circular tx buffer is an aligned page. */ | |
e2afca69 | 1688 | BUG_ON((uintptr_t)port->state->xmit.buf & ~PAGE_MASK); |
73a19e4c | 1689 | sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf), |
e2afca69 LP |
1690 | UART_XMIT_SIZE, |
1691 | (uintptr_t)port->state->xmit.buf & ~PAGE_MASK); | |
73a19e4c GL |
1692 | nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE); |
1693 | if (!nent) | |
1694 | sci_tx_dma_release(s, false); | |
1695 | else | |
9b971cd2 JP |
1696 | dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", |
1697 | __func__, | |
e2afca69 LP |
1698 | sg_dma_len(&s->sg_tx), port->state->xmit.buf, |
1699 | &sg_dma_address(&s->sg_tx)); | |
73a19e4c GL |
1700 | |
1701 | s->sg_len_tx = nent; | |
1702 | ||
1703 | INIT_WORK(&s->work_tx, work_fn_tx); | |
1704 | } | |
1705 | ||
1706 | param = &s->param_rx; | |
1707 | ||
1708 | /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */ | |
d6fa5a4e | 1709 | param->shdma_slave.slave_id = s->cfg->dma_slave_rx; |
73a19e4c GL |
1710 | |
1711 | chan = dma_request_channel(mask, filter, param); | |
1712 | dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan); | |
1713 | if (chan) { | |
1714 | dma_addr_t dma[2]; | |
1715 | void *buf[2]; | |
1716 | int i; | |
1717 | ||
1718 | s->chan_rx = chan; | |
1719 | ||
1720 | s->buf_len_rx = 2 * max(16, (int)port->fifosize); | |
1721 | buf[0] = dma_alloc_coherent(port->dev, s->buf_len_rx * 2, | |
1722 | &dma[0], GFP_KERNEL); | |
1723 | ||
1724 | if (!buf[0]) { | |
1725 | dev_warn(port->dev, | |
1726 | "failed to allocate dma buffer, using PIO\n"); | |
1727 | sci_rx_dma_release(s, true); | |
1728 | return; | |
1729 | } | |
1730 | ||
1731 | buf[1] = buf[0] + s->buf_len_rx; | |
1732 | dma[1] = dma[0] + s->buf_len_rx; | |
1733 | ||
1734 | for (i = 0; i < 2; i++) { | |
1735 | struct scatterlist *sg = &s->sg_rx[i]; | |
1736 | ||
1737 | sg_init_table(sg, 1); | |
1738 | sg_set_page(sg, virt_to_page(buf[i]), s->buf_len_rx, | |
e2afca69 | 1739 | (uintptr_t)buf[i] & ~PAGE_MASK); |
f354a381 | 1740 | sg_dma_address(sg) = dma[i]; |
73a19e4c GL |
1741 | } |
1742 | ||
1743 | INIT_WORK(&s->work_rx, work_fn_rx); | |
1744 | setup_timer(&s->rx_timer, rx_timer_fn, (unsigned long)s); | |
1745 | ||
1746 | sci_submit_rx(s); | |
1747 | } | |
1748 | } | |
1749 | ||
1750 | static void sci_free_dma(struct uart_port *port) | |
1751 | { | |
1752 | struct sci_port *s = to_sci_port(port); | |
1753 | ||
73a19e4c GL |
1754 | if (s->chan_tx) |
1755 | sci_tx_dma_release(s, false); | |
1756 | if (s->chan_rx) | |
1757 | sci_rx_dma_release(s, false); | |
1758 | } | |
27bd1075 PM |
1759 | #else |
1760 | static inline void sci_request_dma(struct uart_port *port) | |
1761 | { | |
1762 | } | |
1763 | ||
1764 | static inline void sci_free_dma(struct uart_port *port) | |
1765 | { | |
1766 | } | |
73a19e4c GL |
1767 | #endif |
1768 | ||
1da177e4 LT |
1769 | static int sci_startup(struct uart_port *port) |
1770 | { | |
a5660ada | 1771 | struct sci_port *s = to_sci_port(port); |
33b48e16 | 1772 | unsigned long flags; |
073e84c9 | 1773 | int ret; |
1da177e4 | 1774 | |
73a19e4c GL |
1775 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
1776 | ||
073e84c9 PM |
1777 | ret = sci_request_irq(s); |
1778 | if (unlikely(ret < 0)) | |
1779 | return ret; | |
1780 | ||
73a19e4c | 1781 | sci_request_dma(port); |
073e84c9 | 1782 | |
33b48e16 | 1783 | spin_lock_irqsave(&port->lock, flags); |
d656901b | 1784 | sci_start_tx(port); |
73a19e4c | 1785 | sci_start_rx(port); |
33b48e16 | 1786 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
1787 | |
1788 | return 0; | |
1789 | } | |
1790 | ||
1791 | static void sci_shutdown(struct uart_port *port) | |
1792 | { | |
a5660ada | 1793 | struct sci_port *s = to_sci_port(port); |
33b48e16 | 1794 | unsigned long flags; |
1da177e4 | 1795 | |
73a19e4c GL |
1796 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
1797 | ||
33b48e16 | 1798 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 1799 | sci_stop_rx(port); |
b129a8cc | 1800 | sci_stop_tx(port); |
33b48e16 | 1801 | spin_unlock_irqrestore(&port->lock, flags); |
073e84c9 | 1802 | |
73a19e4c | 1803 | sci_free_dma(port); |
1da177e4 | 1804 | sci_free_irq(s); |
1da177e4 LT |
1805 | } |
1806 | ||
ec09c5eb | 1807 | static unsigned int sci_scbrr_calc(struct sci_port *s, unsigned int bps, |
26c92f37 PM |
1808 | unsigned long freq) |
1809 | { | |
ec09c5eb LP |
1810 | if (s->sampling_rate) |
1811 | return DIV_ROUND_CLOSEST(freq, s->sampling_rate * bps) - 1; | |
1812 | ||
26c92f37 PM |
1813 | /* Warn, but use a safe default */ |
1814 | WARN_ON(1); | |
e8183a6c | 1815 | |
26c92f37 PM |
1816 | return ((freq + 16 * bps) / (32 * bps) - 1); |
1817 | } | |
1818 | ||
730c4e78 NI |
1819 | /* calculate frame length from SMR */ |
1820 | static int sci_baud_calc_frame_len(unsigned int smr_val) | |
1821 | { | |
1822 | int len = 10; | |
1823 | ||
1824 | if (smr_val & SCSMR_CHR) | |
1825 | len--; | |
1826 | if (smr_val & SCSMR_PE) | |
1827 | len++; | |
1828 | if (smr_val & SCSMR_STOP) | |
1829 | len++; | |
1830 | ||
1831 | return len; | |
1832 | } | |
1833 | ||
1834 | ||
f303b364 UH |
1835 | /* calculate sample rate, BRR, and clock select for HSCIF */ |
1836 | static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq, | |
1837 | int *brr, unsigned int *srr, | |
730c4e78 | 1838 | unsigned int *cks, int frame_len) |
f303b364 | 1839 | { |
730c4e78 | 1840 | int sr, c, br, err, recv_margin; |
f303b364 | 1841 | int min_err = 1000; /* 100% */ |
730c4e78 | 1842 | int recv_max_margin = 0; |
f303b364 UH |
1843 | |
1844 | /* Find the combination of sample rate and clock select with the | |
1845 | smallest deviation from the desired baud rate. */ | |
1846 | for (sr = 8; sr <= 32; sr++) { | |
1847 | for (c = 0; c <= 3; c++) { | |
1848 | /* integerized formulas from HSCIF documentation */ | |
b7d66397 NI |
1849 | br = DIV_ROUND_CLOSEST(freq, (sr * |
1850 | (1 << (2 * c + 1)) * bps)) - 1; | |
bcb9973a | 1851 | br = clamp(br, 0, 255); |
b7d66397 NI |
1852 | err = DIV_ROUND_CLOSEST(freq, ((br + 1) * bps * sr * |
1853 | (1 << (2 * c + 1)) / 1000)) - | |
1854 | 1000; | |
730c4e78 NI |
1855 | /* Calc recv margin |
1856 | * M: Receive margin (%) | |
1857 | * N: Ratio of bit rate to clock (N = sampling rate) | |
1858 | * D: Clock duty (D = 0 to 1.0) | |
1859 | * L: Frame length (L = 9 to 12) | |
1860 | * F: Absolute value of clock frequency deviation | |
1861 | * | |
1862 | * M = |(0.5 - 1 / 2 * N) - ((L - 0.5) * F) - | |
1863 | * (|D - 0.5| / N * (1 + F))| | |
1864 | * NOTE: Usually, treat D for 0.5, F is 0 by this | |
1865 | * calculation. | |
1866 | */ | |
1867 | recv_margin = abs((500 - | |
1868 | DIV_ROUND_CLOSEST(1000, sr << 1)) / 10); | |
f53297fb | 1869 | if (abs(min_err) > abs(err)) { |
f303b364 | 1870 | min_err = err; |
730c4e78 NI |
1871 | recv_max_margin = recv_margin; |
1872 | } else if ((min_err == err) && | |
1873 | (recv_margin > recv_max_margin)) | |
1874 | recv_max_margin = recv_margin; | |
1875 | else | |
1876 | continue; | |
1877 | ||
1878 | *brr = br; | |
1879 | *srr = sr - 1; | |
1880 | *cks = c; | |
f303b364 UH |
1881 | } |
1882 | } | |
1883 | ||
1884 | if (min_err == 1000) { | |
1885 | WARN_ON(1); | |
1886 | /* use defaults */ | |
1887 | *brr = 255; | |
1888 | *srr = 15; | |
1889 | *cks = 0; | |
1890 | } | |
1891 | } | |
1892 | ||
1ba76220 MD |
1893 | static void sci_reset(struct uart_port *port) |
1894 | { | |
0979e0e6 | 1895 | struct plat_sci_reg *reg; |
1ba76220 MD |
1896 | unsigned int status; |
1897 | ||
1898 | do { | |
b12bb29f | 1899 | status = serial_port_in(port, SCxSR); |
1ba76220 MD |
1900 | } while (!(status & SCxSR_TEND(port))); |
1901 | ||
b12bb29f | 1902 | serial_port_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ |
1ba76220 | 1903 | |
0979e0e6 PM |
1904 | reg = sci_getreg(port, SCFCR); |
1905 | if (reg->size) | |
b12bb29f | 1906 | serial_port_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); |
1ba76220 MD |
1907 | } |
1908 | ||
606d099c AC |
1909 | static void sci_set_termios(struct uart_port *port, struct ktermios *termios, |
1910 | struct ktermios *old) | |
1da177e4 | 1911 | { |
00b9de9c | 1912 | struct sci_port *s = to_sci_port(port); |
0979e0e6 | 1913 | struct plat_sci_reg *reg; |
730c4e78 | 1914 | unsigned int baud, smr_val = 0, max_baud, cks = 0; |
a2159b52 | 1915 | int t = -1; |
d4759ded | 1916 | unsigned int srr = 15; |
1da177e4 | 1917 | |
730c4e78 NI |
1918 | if ((termios->c_cflag & CSIZE) == CS7) |
1919 | smr_val |= SCSMR_CHR; | |
1920 | if (termios->c_cflag & PARENB) | |
1921 | smr_val |= SCSMR_PE; | |
1922 | if (termios->c_cflag & PARODD) | |
1923 | smr_val |= SCSMR_PE | SCSMR_ODD; | |
1924 | if (termios->c_cflag & CSTOPB) | |
1925 | smr_val |= SCSMR_STOP; | |
1926 | ||
154280fd MD |
1927 | /* |
1928 | * earlyprintk comes here early on with port->uartclk set to zero. | |
1929 | * the clock framework is not up and running at this point so here | |
1930 | * we assume that 115200 is the maximum baud rate. please note that | |
1931 | * the baud rate is not programmed during earlyprintk - it is assumed | |
1932 | * that the previous boot loader has enabled required clocks and | |
1933 | * setup the baud rate generator hardware for us already. | |
1934 | */ | |
1935 | max_baud = port->uartclk ? port->uartclk / 16 : 115200; | |
1da177e4 | 1936 | |
154280fd | 1937 | baud = uart_get_baud_rate(port, termios, old, 0, max_baud); |
f303b364 | 1938 | if (likely(baud && port->uartclk)) { |
ec09c5eb | 1939 | if (s->cfg->type == PORT_HSCIF) { |
730c4e78 | 1940 | int frame_len = sci_baud_calc_frame_len(smr_val); |
f303b364 | 1941 | sci_baud_calc_hscif(baud, port->uartclk, &t, &srr, |
730c4e78 | 1942 | &cks, frame_len); |
f303b364 | 1943 | } else { |
ec09c5eb | 1944 | t = sci_scbrr_calc(s, baud, port->uartclk); |
f303b364 UH |
1945 | for (cks = 0; t >= 256 && cks <= 3; cks++) |
1946 | t >>= 2; | |
1947 | } | |
1948 | } | |
e108b2ca | 1949 | |
23241d43 | 1950 | sci_port_enable(s); |
36003386 | 1951 | |
1ba76220 | 1952 | sci_reset(port); |
1da177e4 | 1953 | |
730c4e78 | 1954 | smr_val |= serial_port_in(port, SCSMR) & 3; |
1da177e4 LT |
1955 | |
1956 | uart_update_timeout(port, termios->c_cflag, baud); | |
1957 | ||
9d482cc3 TY |
1958 | dev_dbg(port->dev, "%s: SMR %x, cks %x, t %x, SCSCR %x\n", |
1959 | __func__, smr_val, cks, t, s->cfg->scscr); | |
73a19e4c | 1960 | |
4ffc3cdb | 1961 | if (t >= 0) { |
26de4f1b | 1962 | serial_port_out(port, SCSMR, (smr_val & ~SCSMR_CKS) | cks); |
b12bb29f | 1963 | serial_port_out(port, SCBRR, t); |
f303b364 UH |
1964 | reg = sci_getreg(port, HSSRR); |
1965 | if (reg->size) | |
1966 | serial_port_out(port, HSSRR, srr | HSCIF_SRE); | |
1da177e4 | 1967 | udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */ |
9d482cc3 TY |
1968 | } else |
1969 | serial_port_out(port, SCSMR, smr_val); | |
1da177e4 | 1970 | |
d5701647 | 1971 | sci_init_pins(port, termios->c_cflag); |
0979e0e6 | 1972 | |
73c3d53f PM |
1973 | reg = sci_getreg(port, SCFCR); |
1974 | if (reg->size) { | |
b12bb29f | 1975 | unsigned short ctrl = serial_port_in(port, SCFCR); |
0979e0e6 | 1976 | |
73c3d53f | 1977 | if (s->cfg->capabilities & SCIx_HAVE_RTSCTS) { |
faf02f8f PM |
1978 | if (termios->c_cflag & CRTSCTS) |
1979 | ctrl |= SCFCR_MCE; | |
1980 | else | |
1981 | ctrl &= ~SCFCR_MCE; | |
faf02f8f | 1982 | } |
73c3d53f PM |
1983 | |
1984 | /* | |
1985 | * As we've done a sci_reset() above, ensure we don't | |
1986 | * interfere with the FIFOs while toggling MCE. As the | |
1987 | * reset values could still be set, simply mask them out. | |
1988 | */ | |
1989 | ctrl &= ~(SCFCR_RFRST | SCFCR_TFRST); | |
1990 | ||
b12bb29f | 1991 | serial_port_out(port, SCFCR, ctrl); |
0979e0e6 | 1992 | } |
b7a76e4b | 1993 | |
b12bb29f | 1994 | serial_port_out(port, SCSCR, s->cfg->scscr); |
1da177e4 | 1995 | |
3089f381 GL |
1996 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
1997 | /* | |
5f6d8515 NI |
1998 | * Calculate delay for 2 DMA buffers (4 FIFO). |
1999 | * See drivers/serial/serial_core.c::uart_update_timeout(). With 10 | |
2000 | * bits (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above function | |
3089f381 | 2001 | * calculates 1 jiffie for the data plus 5 jiffies for the "slop(e)." |
5f6d8515 NI |
2002 | * Then below we calculate 5 jiffies (20ms) for 2 DMA buffers (4 FIFO |
2003 | * sizes), but when performing a faster transfer, value obtained by | |
2004 | * this formula is may not enough. Therefore, if value is smaller than | |
2005 | * 20msec, this sets 20msec as timeout of DMA. | |
3089f381 GL |
2006 | */ |
2007 | if (s->chan_rx) { | |
5f6d8515 NI |
2008 | unsigned int bits; |
2009 | ||
2010 | /* byte size and parity */ | |
2011 | switch (termios->c_cflag & CSIZE) { | |
2012 | case CS5: | |
2013 | bits = 7; | |
2014 | break; | |
2015 | case CS6: | |
2016 | bits = 8; | |
2017 | break; | |
2018 | case CS7: | |
2019 | bits = 9; | |
2020 | break; | |
2021 | default: | |
2022 | bits = 10; | |
2023 | break; | |
2024 | } | |
2025 | ||
2026 | if (termios->c_cflag & CSTOPB) | |
2027 | bits++; | |
2028 | if (termios->c_cflag & PARENB) | |
2029 | bits++; | |
2030 | s->rx_timeout = DIV_ROUND_UP((s->buf_len_rx * 2 * bits * HZ) / | |
2031 | (baud / 10), 10); | |
9b971cd2 | 2032 | dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n", |
3089f381 GL |
2033 | s->rx_timeout * 1000 / HZ, port->timeout); |
2034 | if (s->rx_timeout < msecs_to_jiffies(20)) | |
2035 | s->rx_timeout = msecs_to_jiffies(20); | |
2036 | } | |
2037 | #endif | |
2038 | ||
1da177e4 | 2039 | if ((termios->c_cflag & CREAD) != 0) |
73a19e4c | 2040 | sci_start_rx(port); |
36003386 | 2041 | |
23241d43 | 2042 | sci_port_disable(s); |
1da177e4 LT |
2043 | } |
2044 | ||
0174e5ca TK |
2045 | static void sci_pm(struct uart_port *port, unsigned int state, |
2046 | unsigned int oldstate) | |
2047 | { | |
2048 | struct sci_port *sci_port = to_sci_port(port); | |
2049 | ||
2050 | switch (state) { | |
d3dfe5d9 | 2051 | case UART_PM_STATE_OFF: |
0174e5ca TK |
2052 | sci_port_disable(sci_port); |
2053 | break; | |
2054 | default: | |
2055 | sci_port_enable(sci_port); | |
2056 | break; | |
2057 | } | |
2058 | } | |
2059 | ||
1da177e4 LT |
2060 | static const char *sci_type(struct uart_port *port) |
2061 | { | |
2062 | switch (port->type) { | |
e7c98dc7 MT |
2063 | case PORT_IRDA: |
2064 | return "irda"; | |
2065 | case PORT_SCI: | |
2066 | return "sci"; | |
2067 | case PORT_SCIF: | |
2068 | return "scif"; | |
2069 | case PORT_SCIFA: | |
2070 | return "scifa"; | |
d1d4b10c GL |
2071 | case PORT_SCIFB: |
2072 | return "scifb"; | |
f303b364 UH |
2073 | case PORT_HSCIF: |
2074 | return "hscif"; | |
1da177e4 LT |
2075 | } |
2076 | ||
fa43972f | 2077 | return NULL; |
1da177e4 LT |
2078 | } |
2079 | ||
f6e9495d PM |
2080 | static int sci_remap_port(struct uart_port *port) |
2081 | { | |
e4d6f911 | 2082 | struct sci_port *sport = to_sci_port(port); |
f6e9495d PM |
2083 | |
2084 | /* | |
2085 | * Nothing to do if there's already an established membase. | |
2086 | */ | |
2087 | if (port->membase) | |
2088 | return 0; | |
2089 | ||
2090 | if (port->flags & UPF_IOREMAP) { | |
e4d6f911 | 2091 | port->membase = ioremap_nocache(port->mapbase, sport->reg_size); |
f6e9495d PM |
2092 | if (unlikely(!port->membase)) { |
2093 | dev_err(port->dev, "can't remap port#%d\n", port->line); | |
2094 | return -ENXIO; | |
2095 | } | |
2096 | } else { | |
2097 | /* | |
2098 | * For the simple (and majority of) cases where we don't | |
2099 | * need to do any remapping, just cast the cookie | |
2100 | * directly. | |
2101 | */ | |
3af4e960 | 2102 | port->membase = (void __iomem *)(uintptr_t)port->mapbase; |
f6e9495d PM |
2103 | } |
2104 | ||
2105 | return 0; | |
2106 | } | |
2107 | ||
e2651647 | 2108 | static void sci_release_port(struct uart_port *port) |
1da177e4 | 2109 | { |
e4d6f911 YS |
2110 | struct sci_port *sport = to_sci_port(port); |
2111 | ||
e2651647 PM |
2112 | if (port->flags & UPF_IOREMAP) { |
2113 | iounmap(port->membase); | |
2114 | port->membase = NULL; | |
2115 | } | |
2116 | ||
e4d6f911 | 2117 | release_mem_region(port->mapbase, sport->reg_size); |
1da177e4 LT |
2118 | } |
2119 | ||
e2651647 | 2120 | static int sci_request_port(struct uart_port *port) |
1da177e4 | 2121 | { |
e2651647 | 2122 | struct resource *res; |
e4d6f911 | 2123 | struct sci_port *sport = to_sci_port(port); |
f6e9495d | 2124 | int ret; |
1da177e4 | 2125 | |
e4d6f911 YS |
2126 | res = request_mem_region(port->mapbase, sport->reg_size, |
2127 | dev_name(port->dev)); | |
2128 | if (unlikely(res == NULL)) { | |
2129 | dev_err(port->dev, "request_mem_region failed."); | |
e2651647 | 2130 | return -EBUSY; |
e4d6f911 | 2131 | } |
1da177e4 | 2132 | |
f6e9495d PM |
2133 | ret = sci_remap_port(port); |
2134 | if (unlikely(ret != 0)) { | |
2135 | release_resource(res); | |
2136 | return ret; | |
7ff731ae | 2137 | } |
e2651647 PM |
2138 | |
2139 | return 0; | |
2140 | } | |
2141 | ||
2142 | static void sci_config_port(struct uart_port *port, int flags) | |
2143 | { | |
2144 | if (flags & UART_CONFIG_TYPE) { | |
2145 | struct sci_port *sport = to_sci_port(port); | |
2146 | ||
2147 | port->type = sport->cfg->type; | |
2148 | sci_request_port(port); | |
2149 | } | |
1da177e4 LT |
2150 | } |
2151 | ||
2152 | static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) | |
2153 | { | |
1da177e4 LT |
2154 | if (ser->baud_base < 2400) |
2155 | /* No paper tape reader for Mitch.. */ | |
2156 | return -EINVAL; | |
2157 | ||
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | static struct uart_ops sci_uart_ops = { | |
2162 | .tx_empty = sci_tx_empty, | |
2163 | .set_mctrl = sci_set_mctrl, | |
2164 | .get_mctrl = sci_get_mctrl, | |
2165 | .start_tx = sci_start_tx, | |
2166 | .stop_tx = sci_stop_tx, | |
2167 | .stop_rx = sci_stop_rx, | |
1da177e4 LT |
2168 | .break_ctl = sci_break_ctl, |
2169 | .startup = sci_startup, | |
2170 | .shutdown = sci_shutdown, | |
2171 | .set_termios = sci_set_termios, | |
0174e5ca | 2172 | .pm = sci_pm, |
1da177e4 LT |
2173 | .type = sci_type, |
2174 | .release_port = sci_release_port, | |
2175 | .request_port = sci_request_port, | |
2176 | .config_port = sci_config_port, | |
2177 | .verify_port = sci_verify_port, | |
07d2a1a1 PM |
2178 | #ifdef CONFIG_CONSOLE_POLL |
2179 | .poll_get_char = sci_poll_get_char, | |
2180 | .poll_put_char = sci_poll_put_char, | |
2181 | #endif | |
1da177e4 LT |
2182 | }; |
2183 | ||
9671f099 | 2184 | static int sci_init_single(struct platform_device *dev, |
1fcc91a6 LP |
2185 | struct sci_port *sci_port, unsigned int index, |
2186 | struct plat_sci_port *p, bool early) | |
e108b2ca | 2187 | { |
73a19e4c | 2188 | struct uart_port *port = &sci_port->port; |
1fcc91a6 | 2189 | const struct resource *res; |
ec09c5eb | 2190 | unsigned int sampling_rate; |
1fcc91a6 | 2191 | unsigned int i; |
3127c6b2 | 2192 | int ret; |
e108b2ca | 2193 | |
50f0959a PM |
2194 | sci_port->cfg = p; |
2195 | ||
73a19e4c GL |
2196 | port->ops = &sci_uart_ops; |
2197 | port->iotype = UPIO_MEM; | |
2198 | port->line = index; | |
75136d48 | 2199 | |
89b5c1ab LP |
2200 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
2201 | if (res == NULL) | |
2202 | return -ENOMEM; | |
1fcc91a6 | 2203 | |
89b5c1ab | 2204 | port->mapbase = res->start; |
e4d6f911 | 2205 | sci_port->reg_size = resource_size(res); |
1fcc91a6 | 2206 | |
89b5c1ab LP |
2207 | for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) |
2208 | sci_port->irqs[i] = platform_get_irq(dev, i); | |
1fcc91a6 | 2209 | |
89b5c1ab LP |
2210 | /* The SCI generates several interrupts. They can be muxed together or |
2211 | * connected to different interrupt lines. In the muxed case only one | |
2212 | * interrupt resource is specified. In the non-muxed case three or four | |
2213 | * interrupt resources are specified, as the BRI interrupt is optional. | |
2214 | */ | |
2215 | if (sci_port->irqs[0] < 0) | |
2216 | return -ENXIO; | |
1fcc91a6 | 2217 | |
89b5c1ab LP |
2218 | if (sci_port->irqs[1] < 0) { |
2219 | sci_port->irqs[1] = sci_port->irqs[0]; | |
2220 | sci_port->irqs[2] = sci_port->irqs[0]; | |
2221 | sci_port->irqs[3] = sci_port->irqs[0]; | |
1fcc91a6 LP |
2222 | } |
2223 | ||
b545e4f4 LP |
2224 | if (p->regtype == SCIx_PROBE_REGTYPE) { |
2225 | ret = sci_probe_regmap(p); | |
2226 | if (unlikely(ret)) | |
2227 | return ret; | |
2228 | } | |
2229 | ||
75136d48 | 2230 | switch (p->type) { |
d1d4b10c GL |
2231 | case PORT_SCIFB: |
2232 | port->fifosize = 256; | |
2e0842a1 | 2233 | sci_port->overrun_reg = SCxSR; |
75c249fd | 2234 | sci_port->overrun_mask = SCIFA_ORER; |
ec09c5eb | 2235 | sampling_rate = 16; |
d1d4b10c | 2236 | break; |
f303b364 UH |
2237 | case PORT_HSCIF: |
2238 | port->fifosize = 128; | |
ec09c5eb | 2239 | sampling_rate = 0; |
2e0842a1 | 2240 | sci_port->overrun_reg = SCLSR; |
75c249fd | 2241 | sci_port->overrun_mask = SCLSR_ORER; |
f303b364 | 2242 | break; |
75136d48 | 2243 | case PORT_SCIFA: |
73a19e4c | 2244 | port->fifosize = 64; |
2e0842a1 | 2245 | sci_port->overrun_reg = SCxSR; |
75c249fd | 2246 | sci_port->overrun_mask = SCIFA_ORER; |
ec09c5eb | 2247 | sampling_rate = 16; |
75136d48 MP |
2248 | break; |
2249 | case PORT_SCIF: | |
73a19e4c | 2250 | port->fifosize = 16; |
ec09c5eb | 2251 | if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) { |
2e0842a1 | 2252 | sci_port->overrun_reg = SCxSR; |
75c249fd | 2253 | sci_port->overrun_mask = SCIFA_ORER; |
ec09c5eb LP |
2254 | sampling_rate = 16; |
2255 | } else { | |
2e0842a1 | 2256 | sci_port->overrun_reg = SCLSR; |
75c249fd | 2257 | sci_port->overrun_mask = SCLSR_ORER; |
ec09c5eb LP |
2258 | sampling_rate = 32; |
2259 | } | |
75136d48 MP |
2260 | break; |
2261 | default: | |
73a19e4c | 2262 | port->fifosize = 1; |
2e0842a1 | 2263 | sci_port->overrun_reg = SCxSR; |
75c249fd | 2264 | sci_port->overrun_mask = SCI_ORER; |
ec09c5eb | 2265 | sampling_rate = 32; |
75136d48 MP |
2266 | break; |
2267 | } | |
7b6fd3bf | 2268 | |
878fbb91 LP |
2269 | /* SCIFA on sh7723 and sh7724 need a custom sampling rate that doesn't |
2270 | * match the SoC datasheet, this should be investigated. Let platform | |
2271 | * data override the sampling rate for now. | |
ec09c5eb | 2272 | */ |
878fbb91 LP |
2273 | sci_port->sampling_rate = p->sampling_rate ? p->sampling_rate |
2274 | : sampling_rate; | |
ec09c5eb | 2275 | |
1fcc91a6 | 2276 | if (!early) { |
c7ed1ab3 PM |
2277 | sci_port->iclk = clk_get(&dev->dev, "sci_ick"); |
2278 | if (IS_ERR(sci_port->iclk)) { | |
2279 | sci_port->iclk = clk_get(&dev->dev, "peripheral_clk"); | |
2280 | if (IS_ERR(sci_port->iclk)) { | |
2281 | dev_err(&dev->dev, "can't get iclk\n"); | |
2282 | return PTR_ERR(sci_port->iclk); | |
2283 | } | |
2284 | } | |
2285 | ||
2286 | /* | |
2287 | * The function clock is optional, ignore it if we can't | |
2288 | * find it. | |
2289 | */ | |
2290 | sci_port->fclk = clk_get(&dev->dev, "sci_fck"); | |
2291 | if (IS_ERR(sci_port->fclk)) | |
2292 | sci_port->fclk = NULL; | |
2293 | ||
73a19e4c | 2294 | port->dev = &dev->dev; |
5e50d2d6 MD |
2295 | |
2296 | pm_runtime_enable(&dev->dev); | |
7b6fd3bf | 2297 | } |
e108b2ca | 2298 | |
7ed7e071 MD |
2299 | sci_port->break_timer.data = (unsigned long)sci_port; |
2300 | sci_port->break_timer.function = sci_break_timer; | |
2301 | init_timer(&sci_port->break_timer); | |
2302 | ||
debf9507 PM |
2303 | /* |
2304 | * Establish some sensible defaults for the error detection. | |
2305 | */ | |
3ae988d9 | 2306 | sci_port->error_mask = (p->type == PORT_SCI) ? |
debf9507 PM |
2307 | SCI_DEFAULT_ERROR_MASK : SCIF_DEFAULT_ERROR_MASK; |
2308 | ||
3ae988d9 LP |
2309 | /* |
2310 | * Make the error mask inclusive of overrun detection, if | |
2311 | * supported. | |
2312 | */ | |
afd66db6 GU |
2313 | if (sci_port->overrun_reg == SCxSR) |
2314 | sci_port->error_mask |= sci_port->overrun_mask; | |
debf9507 | 2315 | |
ce6738b6 | 2316 | port->type = p->type; |
b6e4a3f1 | 2317 | port->flags = UPF_FIXED_PORT | p->flags; |
61a6976b | 2318 | port->regshift = p->regshift; |
73a19e4c | 2319 | |
ce6738b6 | 2320 | /* |
61a6976b | 2321 | * The UART port needs an IRQ value, so we peg this to the RX IRQ |
ce6738b6 PM |
2322 | * for the multi-IRQ ports, which is where we are primarily |
2323 | * concerned with the shutdown path synchronization. | |
2324 | * | |
2325 | * For the muxed case there's nothing more to do. | |
2326 | */ | |
1fcc91a6 | 2327 | port->irq = sci_port->irqs[SCIx_RXI_IRQ]; |
9cfb5c05 | 2328 | port->irqflags = 0; |
73a19e4c | 2329 | |
61a6976b PM |
2330 | port->serial_in = sci_serial_in; |
2331 | port->serial_out = sci_serial_out; | |
2332 | ||
937bb6e4 GL |
2333 | if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) |
2334 | dev_dbg(port->dev, "DMA tx %d, rx %d\n", | |
2335 | p->dma_slave_tx, p->dma_slave_rx); | |
7ed7e071 | 2336 | |
c7ed1ab3 | 2337 | return 0; |
e108b2ca PM |
2338 | } |
2339 | ||
6dae1421 LP |
2340 | static void sci_cleanup_single(struct sci_port *port) |
2341 | { | |
6dae1421 LP |
2342 | clk_put(port->iclk); |
2343 | clk_put(port->fclk); | |
2344 | ||
2345 | pm_runtime_disable(port->port.dev); | |
2346 | } | |
2347 | ||
1da177e4 | 2348 | #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
dc8e6f5b MD |
2349 | static void serial_console_putchar(struct uart_port *port, int ch) |
2350 | { | |
2351 | sci_poll_put_char(port, ch); | |
2352 | } | |
2353 | ||
1da177e4 LT |
2354 | /* |
2355 | * Print a string to the serial port trying not to disturb | |
2356 | * any possible real use of the port... | |
2357 | */ | |
2358 | static void serial_console_write(struct console *co, const char *s, | |
2359 | unsigned count) | |
2360 | { | |
906b17dc PM |
2361 | struct sci_port *sci_port = &sci_ports[co->index]; |
2362 | struct uart_port *port = &sci_port->port; | |
40f70c03 SK |
2363 | unsigned short bits, ctrl; |
2364 | unsigned long flags; | |
2365 | int locked = 1; | |
2366 | ||
2367 | local_irq_save(flags); | |
2368 | if (port->sysrq) | |
2369 | locked = 0; | |
2370 | else if (oops_in_progress) | |
2371 | locked = spin_trylock(&port->lock); | |
2372 | else | |
2373 | spin_lock(&port->lock); | |
2374 | ||
2375 | /* first save the SCSCR then disable the interrupts */ | |
2376 | ctrl = serial_port_in(port, SCSCR); | |
2377 | serial_port_out(port, SCSCR, sci_port->cfg->scscr); | |
07d2a1a1 | 2378 | |
501b825d | 2379 | uart_console_write(port, s, count, serial_console_putchar); |
973e5d52 MD |
2380 | |
2381 | /* wait until fifo is empty and last bit has been transmitted */ | |
2382 | bits = SCxSR_TDxE(port) | SCxSR_TEND(port); | |
b12bb29f | 2383 | while ((serial_port_in(port, SCxSR) & bits) != bits) |
973e5d52 | 2384 | cpu_relax(); |
40f70c03 SK |
2385 | |
2386 | /* restore the SCSCR */ | |
2387 | serial_port_out(port, SCSCR, ctrl); | |
2388 | ||
2389 | if (locked) | |
2390 | spin_unlock(&port->lock); | |
2391 | local_irq_restore(flags); | |
1da177e4 LT |
2392 | } |
2393 | ||
9671f099 | 2394 | static int serial_console_setup(struct console *co, char *options) |
1da177e4 | 2395 | { |
dc8e6f5b | 2396 | struct sci_port *sci_port; |
1da177e4 LT |
2397 | struct uart_port *port; |
2398 | int baud = 115200; | |
2399 | int bits = 8; | |
2400 | int parity = 'n'; | |
2401 | int flow = 'n'; | |
2402 | int ret; | |
2403 | ||
e108b2ca | 2404 | /* |
906b17dc | 2405 | * Refuse to handle any bogus ports. |
1da177e4 | 2406 | */ |
906b17dc | 2407 | if (co->index < 0 || co->index >= SCI_NPORTS) |
e108b2ca | 2408 | return -ENODEV; |
e108b2ca | 2409 | |
906b17dc PM |
2410 | sci_port = &sci_ports[co->index]; |
2411 | port = &sci_port->port; | |
2412 | ||
b2267a6b AC |
2413 | /* |
2414 | * Refuse to handle uninitialized ports. | |
2415 | */ | |
2416 | if (!port->ops) | |
2417 | return -ENODEV; | |
2418 | ||
f6e9495d PM |
2419 | ret = sci_remap_port(port); |
2420 | if (unlikely(ret != 0)) | |
2421 | return ret; | |
e108b2ca | 2422 | |
1da177e4 LT |
2423 | if (options) |
2424 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2425 | ||
ab7cfb55 | 2426 | return uart_set_options(port, co, baud, parity, bits, flow); |
1da177e4 LT |
2427 | } |
2428 | ||
2429 | static struct console serial_console = { | |
2430 | .name = "ttySC", | |
906b17dc | 2431 | .device = uart_console_device, |
1da177e4 LT |
2432 | .write = serial_console_write, |
2433 | .setup = serial_console_setup, | |
fa5da2f7 | 2434 | .flags = CON_PRINTBUFFER, |
1da177e4 | 2435 | .index = -1, |
906b17dc | 2436 | .data = &sci_uart_driver, |
1da177e4 LT |
2437 | }; |
2438 | ||
7b6fd3bf MD |
2439 | static struct console early_serial_console = { |
2440 | .name = "early_ttySC", | |
2441 | .write = serial_console_write, | |
2442 | .flags = CON_PRINTBUFFER, | |
906b17dc | 2443 | .index = -1, |
7b6fd3bf | 2444 | }; |
ecdf8a46 | 2445 | |
7b6fd3bf MD |
2446 | static char early_serial_buf[32]; |
2447 | ||
9671f099 | 2448 | static int sci_probe_earlyprintk(struct platform_device *pdev) |
ecdf8a46 | 2449 | { |
574de559 | 2450 | struct plat_sci_port *cfg = dev_get_platdata(&pdev->dev); |
ecdf8a46 PM |
2451 | |
2452 | if (early_serial_console.data) | |
2453 | return -EEXIST; | |
2454 | ||
2455 | early_serial_console.index = pdev->id; | |
ecdf8a46 | 2456 | |
1fcc91a6 | 2457 | sci_init_single(pdev, &sci_ports[pdev->id], pdev->id, cfg, true); |
ecdf8a46 PM |
2458 | |
2459 | serial_console_setup(&early_serial_console, early_serial_buf); | |
2460 | ||
2461 | if (!strstr(early_serial_buf, "keep")) | |
2462 | early_serial_console.flags |= CON_BOOT; | |
2463 | ||
2464 | register_console(&early_serial_console); | |
2465 | return 0; | |
2466 | } | |
6a8c9799 NI |
2467 | |
2468 | #define SCI_CONSOLE (&serial_console) | |
2469 | ||
ecdf8a46 | 2470 | #else |
9671f099 | 2471 | static inline int sci_probe_earlyprintk(struct platform_device *pdev) |
ecdf8a46 PM |
2472 | { |
2473 | return -EINVAL; | |
2474 | } | |
1da177e4 | 2475 | |
6a8c9799 NI |
2476 | #define SCI_CONSOLE NULL |
2477 | ||
2478 | #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */ | |
1da177e4 | 2479 | |
6c13d5d2 | 2480 | static const char banner[] __initconst = "SuperH (H)SCI(F) driver initialized"; |
1da177e4 LT |
2481 | |
2482 | static struct uart_driver sci_uart_driver = { | |
2483 | .owner = THIS_MODULE, | |
2484 | .driver_name = "sci", | |
1da177e4 LT |
2485 | .dev_name = "ttySC", |
2486 | .major = SCI_MAJOR, | |
2487 | .minor = SCI_MINOR_START, | |
e108b2ca | 2488 | .nr = SCI_NPORTS, |
1da177e4 LT |
2489 | .cons = SCI_CONSOLE, |
2490 | }; | |
2491 | ||
54507f6e | 2492 | static int sci_remove(struct platform_device *dev) |
e552de24 | 2493 | { |
d535a230 | 2494 | struct sci_port *port = platform_get_drvdata(dev); |
e552de24 | 2495 | |
d535a230 PM |
2496 | cpufreq_unregister_notifier(&port->freq_transition, |
2497 | CPUFREQ_TRANSITION_NOTIFIER); | |
e552de24 | 2498 | |
d535a230 PM |
2499 | uart_remove_one_port(&sci_uart_driver, &port->port); |
2500 | ||
6dae1421 | 2501 | sci_cleanup_single(port); |
e552de24 | 2502 | |
e552de24 MD |
2503 | return 0; |
2504 | } | |
2505 | ||
20bdcab8 BH |
2506 | struct sci_port_info { |
2507 | unsigned int type; | |
2508 | unsigned int regtype; | |
2509 | }; | |
2510 | ||
2511 | static const struct of_device_id of_sci_match[] = { | |
2512 | { | |
2513 | .compatible = "renesas,scif", | |
ff43da00 | 2514 | .data = &(const struct sci_port_info) { |
20bdcab8 BH |
2515 | .type = PORT_SCIF, |
2516 | .regtype = SCIx_SH4_SCIF_REGTYPE, | |
2517 | }, | |
2518 | }, { | |
2519 | .compatible = "renesas,scifa", | |
ff43da00 | 2520 | .data = &(const struct sci_port_info) { |
20bdcab8 BH |
2521 | .type = PORT_SCIFA, |
2522 | .regtype = SCIx_SCIFA_REGTYPE, | |
2523 | }, | |
2524 | }, { | |
2525 | .compatible = "renesas,scifb", | |
ff43da00 | 2526 | .data = &(const struct sci_port_info) { |
20bdcab8 BH |
2527 | .type = PORT_SCIFB, |
2528 | .regtype = SCIx_SCIFB_REGTYPE, | |
2529 | }, | |
2530 | }, { | |
2531 | .compatible = "renesas,hscif", | |
ff43da00 | 2532 | .data = &(const struct sci_port_info) { |
20bdcab8 BH |
2533 | .type = PORT_HSCIF, |
2534 | .regtype = SCIx_HSCIF_REGTYPE, | |
2535 | }, | |
e1d0be61 YS |
2536 | }, { |
2537 | .compatible = "renesas,sci", | |
2538 | .data = &(const struct sci_port_info) { | |
2539 | .type = PORT_SCI, | |
2540 | .regtype = SCIx_SCI_REGTYPE, | |
2541 | }, | |
20bdcab8 BH |
2542 | }, { |
2543 | /* Terminator */ | |
2544 | }, | |
2545 | }; | |
2546 | MODULE_DEVICE_TABLE(of, of_sci_match); | |
2547 | ||
2548 | static struct plat_sci_port * | |
2549 | sci_parse_dt(struct platform_device *pdev, unsigned int *dev_id) | |
2550 | { | |
2551 | struct device_node *np = pdev->dev.of_node; | |
2552 | const struct of_device_id *match; | |
2553 | const struct sci_port_info *info; | |
2554 | struct plat_sci_port *p; | |
2555 | int id; | |
2556 | ||
2557 | if (!IS_ENABLED(CONFIG_OF) || !np) | |
2558 | return NULL; | |
2559 | ||
2560 | match = of_match_node(of_sci_match, pdev->dev.of_node); | |
2561 | if (!match) | |
2562 | return NULL; | |
2563 | ||
2564 | info = match->data; | |
2565 | ||
2566 | p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL); | |
2567 | if (!p) { | |
2568 | dev_err(&pdev->dev, "failed to allocate DT config data\n"); | |
2569 | return NULL; | |
2570 | } | |
2571 | ||
2572 | /* Get the line number for the aliases node. */ | |
2573 | id = of_alias_get_id(np, "serial"); | |
2574 | if (id < 0) { | |
2575 | dev_err(&pdev->dev, "failed to get alias id (%d)\n", id); | |
2576 | return NULL; | |
2577 | } | |
2578 | ||
2579 | *dev_id = id; | |
2580 | ||
2581 | p->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; | |
2582 | p->type = info->type; | |
2583 | p->regtype = info->regtype; | |
2584 | p->scscr = SCSCR_RE | SCSCR_TE; | |
2585 | ||
2586 | return p; | |
2587 | } | |
2588 | ||
9671f099 | 2589 | static int sci_probe_single(struct platform_device *dev, |
0ee70712 MD |
2590 | unsigned int index, |
2591 | struct plat_sci_port *p, | |
2592 | struct sci_port *sciport) | |
2593 | { | |
0ee70712 MD |
2594 | int ret; |
2595 | ||
2596 | /* Sanity check */ | |
2597 | if (unlikely(index >= SCI_NPORTS)) { | |
9b971cd2 | 2598 | dev_notice(&dev->dev, "Attempting to register port %d when only %d are available\n", |
0ee70712 | 2599 | index+1, SCI_NPORTS); |
9b971cd2 | 2600 | dev_notice(&dev->dev, "Consider bumping CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); |
b6c5ef6f | 2601 | return -EINVAL; |
0ee70712 MD |
2602 | } |
2603 | ||
1fcc91a6 | 2604 | ret = sci_init_single(dev, sciport, index, p, false); |
c7ed1ab3 PM |
2605 | if (ret) |
2606 | return ret; | |
0ee70712 | 2607 | |
6dae1421 LP |
2608 | ret = uart_add_one_port(&sci_uart_driver, &sciport->port); |
2609 | if (ret) { | |
2610 | sci_cleanup_single(sciport); | |
2611 | return ret; | |
2612 | } | |
2613 | ||
2614 | return 0; | |
0ee70712 MD |
2615 | } |
2616 | ||
9671f099 | 2617 | static int sci_probe(struct platform_device *dev) |
1da177e4 | 2618 | { |
20bdcab8 BH |
2619 | struct plat_sci_port *p; |
2620 | struct sci_port *sp; | |
2621 | unsigned int dev_id; | |
ecdf8a46 | 2622 | int ret; |
d535a230 | 2623 | |
ecdf8a46 PM |
2624 | /* |
2625 | * If we've come here via earlyprintk initialization, head off to | |
2626 | * the special early probe. We don't have sufficient device state | |
2627 | * to make it beyond this yet. | |
2628 | */ | |
2629 | if (is_early_platform_device(dev)) | |
2630 | return sci_probe_earlyprintk(dev); | |
7b6fd3bf | 2631 | |
20bdcab8 BH |
2632 | if (dev->dev.of_node) { |
2633 | p = sci_parse_dt(dev, &dev_id); | |
2634 | if (p == NULL) | |
2635 | return -EINVAL; | |
2636 | } else { | |
2637 | p = dev->dev.platform_data; | |
2638 | if (p == NULL) { | |
2639 | dev_err(&dev->dev, "no platform data supplied\n"); | |
2640 | return -EINVAL; | |
2641 | } | |
2642 | ||
2643 | dev_id = dev->id; | |
2644 | } | |
2645 | ||
2646 | sp = &sci_ports[dev_id]; | |
d535a230 | 2647 | platform_set_drvdata(dev, sp); |
e552de24 | 2648 | |
20bdcab8 | 2649 | ret = sci_probe_single(dev, dev_id, p, sp); |
d535a230 | 2650 | if (ret) |
6dae1421 | 2651 | return ret; |
e552de24 | 2652 | |
d535a230 | 2653 | sp->freq_transition.notifier_call = sci_notifier; |
1da177e4 | 2654 | |
d535a230 PM |
2655 | ret = cpufreq_register_notifier(&sp->freq_transition, |
2656 | CPUFREQ_TRANSITION_NOTIFIER); | |
6dae1421 | 2657 | if (unlikely(ret < 0)) { |
bf13c9a8 | 2658 | uart_remove_one_port(&sci_uart_driver, &sp->port); |
6dae1421 LP |
2659 | sci_cleanup_single(sp); |
2660 | return ret; | |
2661 | } | |
1da177e4 LT |
2662 | |
2663 | #ifdef CONFIG_SH_STANDARD_BIOS | |
2664 | sh_bios_gdb_detach(); | |
2665 | #endif | |
2666 | ||
e108b2ca | 2667 | return 0; |
1da177e4 LT |
2668 | } |
2669 | ||
cb876341 | 2670 | static __maybe_unused int sci_suspend(struct device *dev) |
1da177e4 | 2671 | { |
d535a230 | 2672 | struct sci_port *sport = dev_get_drvdata(dev); |
e108b2ca | 2673 | |
d535a230 PM |
2674 | if (sport) |
2675 | uart_suspend_port(&sci_uart_driver, &sport->port); | |
1da177e4 | 2676 | |
e108b2ca PM |
2677 | return 0; |
2678 | } | |
1da177e4 | 2679 | |
cb876341 | 2680 | static __maybe_unused int sci_resume(struct device *dev) |
e108b2ca | 2681 | { |
d535a230 | 2682 | struct sci_port *sport = dev_get_drvdata(dev); |
e108b2ca | 2683 | |
d535a230 PM |
2684 | if (sport) |
2685 | uart_resume_port(&sci_uart_driver, &sport->port); | |
e108b2ca PM |
2686 | |
2687 | return 0; | |
2688 | } | |
2689 | ||
cb876341 | 2690 | static SIMPLE_DEV_PM_OPS(sci_dev_pm_ops, sci_suspend, sci_resume); |
6daa79b3 | 2691 | |
e108b2ca PM |
2692 | static struct platform_driver sci_driver = { |
2693 | .probe = sci_probe, | |
b9e39c89 | 2694 | .remove = sci_remove, |
e108b2ca PM |
2695 | .driver = { |
2696 | .name = "sh-sci", | |
6daa79b3 | 2697 | .pm = &sci_dev_pm_ops, |
20bdcab8 | 2698 | .of_match_table = of_match_ptr(of_sci_match), |
e108b2ca PM |
2699 | }, |
2700 | }; | |
2701 | ||
2702 | static int __init sci_init(void) | |
2703 | { | |
2704 | int ret; | |
2705 | ||
6c13d5d2 | 2706 | pr_info("%s\n", banner); |
e108b2ca | 2707 | |
e108b2ca PM |
2708 | ret = uart_register_driver(&sci_uart_driver); |
2709 | if (likely(ret == 0)) { | |
2710 | ret = platform_driver_register(&sci_driver); | |
2711 | if (unlikely(ret)) | |
2712 | uart_unregister_driver(&sci_uart_driver); | |
2713 | } | |
2714 | ||
2715 | return ret; | |
2716 | } | |
2717 | ||
2718 | static void __exit sci_exit(void) | |
2719 | { | |
2720 | platform_driver_unregister(&sci_driver); | |
1da177e4 LT |
2721 | uart_unregister_driver(&sci_uart_driver); |
2722 | } | |
2723 | ||
7b6fd3bf MD |
2724 | #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
2725 | early_platform_init_buffer("earlyprintk", &sci_driver, | |
2726 | early_serial_buf, ARRAY_SIZE(early_serial_buf)); | |
2727 | #endif | |
1da177e4 LT |
2728 | module_init(sci_init); |
2729 | module_exit(sci_exit); | |
2730 | ||
e108b2ca | 2731 | MODULE_LICENSE("GPL"); |
e169c139 | 2732 | MODULE_ALIAS("platform:sh-sci"); |
7f405f9c | 2733 | MODULE_AUTHOR("Paul Mundt"); |
f303b364 | 2734 | MODULE_DESCRIPTION("SuperH (H)SCI(F) serial driver"); |