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Commit | Line | Data |
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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 |
f4998e55 | 5 | * Copyright (C) 2015 Glider bvba |
3ea6bc3d | 6 | * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007). |
1da177e4 LT |
7 | * |
8 | * based off of the old drivers/char/sh-sci.c by: | |
9 | * | |
10 | * Copyright (C) 1999, 2000 Niibe Yutaka | |
11 | * Copyright (C) 2000 Sugioka Toshinobu | |
12 | * Modified to support multiple serial ports. Stuart Menefy (May 2000). | |
13 | * Modified to support SecureEdge. David McCullough (2002) | |
14 | * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003). | |
d89ddd1c | 15 | * Removed SH7300 support (Jul 2007). |
1da177e4 LT |
16 | * |
17 | * This file is subject to the terms and conditions of the GNU General Public | |
18 | * License. See the file "COPYING" in the main directory of this archive | |
19 | * for more details. | |
20 | */ | |
0b3d4ef6 PM |
21 | #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
22 | #define SUPPORT_SYSRQ | |
23 | #endif | |
1da177e4 LT |
24 | |
25 | #undef DEBUG | |
26 | ||
8fb9631c LP |
27 | #include <linux/clk.h> |
28 | #include <linux/console.h> | |
29 | #include <linux/ctype.h> | |
30 | #include <linux/cpufreq.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/dmaengine.h> | |
33 | #include <linux/dma-mapping.h> | |
34 | #include <linux/err.h> | |
1da177e4 | 35 | #include <linux/errno.h> |
8fb9631c | 36 | #include <linux/init.h> |
1da177e4 | 37 | #include <linux/interrupt.h> |
1da177e4 | 38 | #include <linux/ioport.h> |
8fb9631c LP |
39 | #include <linux/major.h> |
40 | #include <linux/module.h> | |
1da177e4 | 41 | #include <linux/mm.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 | ||
f907c9ea | 60 | #include "serial_mctrl_gpio.h" |
1da177e4 LT |
61 | #include "sh-sci.h" |
62 | ||
89b5c1ab LP |
63 | /* Offsets into the sci_port->irqs array */ |
64 | enum { | |
65 | SCIx_ERI_IRQ, | |
66 | SCIx_RXI_IRQ, | |
67 | SCIx_TXI_IRQ, | |
68 | SCIx_BRI_IRQ, | |
69 | SCIx_NR_IRQS, | |
70 | ||
71 | SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */ | |
72 | }; | |
73 | ||
74 | #define SCIx_IRQ_IS_MUXED(port) \ | |
75 | ((port)->irqs[SCIx_ERI_IRQ] == \ | |
76 | (port)->irqs[SCIx_RXI_IRQ]) || \ | |
77 | ((port)->irqs[SCIx_ERI_IRQ] && \ | |
78 | ((port)->irqs[SCIx_RXI_IRQ] < 0)) | |
79 | ||
f4998e55 GU |
80 | enum SCI_CLKS { |
81 | SCI_FCK, /* Functional Clock */ | |
6af27bf2 | 82 | SCI_SCK, /* Optional External Clock */ |
1270f865 GU |
83 | SCI_BRG_INT, /* Optional BRG Internal Clock Source */ |
84 | SCI_SCIF_CLK, /* Optional BRG External Clock Source */ | |
f4998e55 GU |
85 | SCI_NUM_CLKS |
86 | }; | |
87 | ||
69eee8e9 GU |
88 | /* Bit x set means sampling rate x + 1 is supported */ |
89 | #define SCI_SR(x) BIT((x) - 1) | |
90 | #define SCI_SR_RANGE(x, y) GENMASK((y) - 1, (x) - 1) | |
91 | ||
92a05748 GU |
92 | #define SCI_SR_SCIFAB SCI_SR(5) | SCI_SR(7) | SCI_SR(11) | \ |
93 | SCI_SR(13) | SCI_SR(16) | SCI_SR(17) | \ | |
94 | SCI_SR(19) | SCI_SR(27) | |
95 | ||
69eee8e9 GU |
96 | #define min_sr(_port) ffs((_port)->sampling_rate_mask) |
97 | #define max_sr(_port) fls((_port)->sampling_rate_mask) | |
98 | ||
99 | /* Iterate over all supported sampling rates, from high to low */ | |
100 | #define for_each_sr(_sr, _port) \ | |
101 | for ((_sr) = max_sr(_port); (_sr) >= min_sr(_port); (_sr)--) \ | |
102 | if ((_port)->sampling_rate_mask & SCI_SR((_sr))) | |
103 | ||
e095ee6b LP |
104 | struct plat_sci_reg { |
105 | u8 offset, size; | |
106 | }; | |
107 | ||
108 | struct sci_port_params { | |
109 | const struct plat_sci_reg regs[SCIx_NR_REGS]; | |
b2f20ed9 LP |
110 | unsigned int fifosize; |
111 | unsigned int overrun_reg; | |
112 | unsigned int overrun_mask; | |
113 | unsigned int sampling_rate_mask; | |
114 | unsigned int error_mask; | |
115 | unsigned int error_clear; | |
e095ee6b LP |
116 | }; |
117 | ||
e108b2ca PM |
118 | struct sci_port { |
119 | struct uart_port port; | |
120 | ||
ce6738b6 | 121 | /* Platform configuration */ |
e095ee6b | 122 | const struct sci_port_params *params; |
daf5a895 | 123 | const struct plat_sci_port *cfg; |
69eee8e9 | 124 | unsigned int sampling_rate_mask; |
e4d6f911 | 125 | resource_size_t reg_size; |
f907c9ea | 126 | struct mctrl_gpios *gpios; |
e108b2ca | 127 | |
f4998e55 GU |
128 | /* Clocks */ |
129 | struct clk *clks[SCI_NUM_CLKS]; | |
130 | unsigned long clk_rates[SCI_NUM_CLKS]; | |
edad1f20 | 131 | |
1fcc91a6 | 132 | int irqs[SCIx_NR_IRQS]; |
9174fc8f PM |
133 | char *irqstr[SCIx_NR_IRQS]; |
134 | ||
73a19e4c GL |
135 | struct dma_chan *chan_tx; |
136 | struct dma_chan *chan_rx; | |
f43dc23d | 137 | |
73a19e4c | 138 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
73a19e4c GL |
139 | dma_cookie_t cookie_tx; |
140 | dma_cookie_t cookie_rx[2]; | |
141 | dma_cookie_t active_rx; | |
79904420 GU |
142 | dma_addr_t tx_dma_addr; |
143 | unsigned int tx_dma_len; | |
73a19e4c | 144 | struct scatterlist sg_rx[2]; |
7b39d901 | 145 | void *rx_buf[2]; |
73a19e4c | 146 | size_t buf_len_rx; |
73a19e4c | 147 | struct work_struct work_tx; |
73a19e4c | 148 | struct timer_list rx_timer; |
3089f381 | 149 | unsigned int rx_timeout; |
73a19e4c | 150 | #endif |
03940376 | 151 | unsigned int rx_frame; |
18e8cf15 | 152 | int rx_trigger; |
03940376 UH |
153 | struct timer_list rx_fifo_timer; |
154 | int rx_fifo_timeout; | |
33f50ffc | 155 | |
97ed9790 | 156 | bool has_rtscts; |
33f50ffc | 157 | bool autorts; |
e108b2ca PM |
158 | }; |
159 | ||
e108b2ca | 160 | #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS |
b7a76e4b | 161 | |
e108b2ca PM |
162 | static struct sci_port sci_ports[SCI_NPORTS]; |
163 | static struct uart_driver sci_uart_driver; | |
1da177e4 | 164 | |
e7c98dc7 MT |
165 | static inline struct sci_port * |
166 | to_sci_port(struct uart_port *uart) | |
167 | { | |
168 | return container_of(uart, struct sci_port, port); | |
169 | } | |
170 | ||
e095ee6b | 171 | static const struct sci_port_params sci_port_params[SCIx_NR_REGTYPES] = { |
61a6976b PM |
172 | /* |
173 | * Common SCI definitions, dependent on the port's regshift | |
174 | * value. | |
175 | */ | |
176 | [SCIx_SCI_REGTYPE] = { | |
e095ee6b LP |
177 | .regs = { |
178 | [SCSMR] = { 0x00, 8 }, | |
179 | [SCBRR] = { 0x01, 8 }, | |
180 | [SCSCR] = { 0x02, 8 }, | |
181 | [SCxTDR] = { 0x03, 8 }, | |
182 | [SCxSR] = { 0x04, 8 }, | |
183 | [SCxRDR] = { 0x05, 8 }, | |
184 | }, | |
b2f20ed9 LP |
185 | .fifosize = 1, |
186 | .overrun_reg = SCxSR, | |
187 | .overrun_mask = SCI_ORER, | |
188 | .sampling_rate_mask = SCI_SR(32), | |
189 | .error_mask = SCI_DEFAULT_ERROR_MASK | SCI_ORER, | |
190 | .error_clear = SCI_ERROR_CLEAR & ~SCI_ORER, | |
61a6976b PM |
191 | }, |
192 | ||
193 | /* | |
a752ba18 | 194 | * Common definitions for legacy IrDA ports. |
61a6976b PM |
195 | */ |
196 | [SCIx_IRDA_REGTYPE] = { | |
e095ee6b LP |
197 | .regs = { |
198 | [SCSMR] = { 0x00, 8 }, | |
199 | [SCBRR] = { 0x02, 8 }, | |
200 | [SCSCR] = { 0x04, 8 }, | |
201 | [SCxTDR] = { 0x06, 8 }, | |
202 | [SCxSR] = { 0x08, 16 }, | |
203 | [SCxRDR] = { 0x0a, 8 }, | |
204 | [SCFCR] = { 0x0c, 8 }, | |
205 | [SCFDR] = { 0x0e, 16 }, | |
206 | }, | |
b2f20ed9 LP |
207 | .fifosize = 1, |
208 | .overrun_reg = SCxSR, | |
209 | .overrun_mask = SCI_ORER, | |
210 | .sampling_rate_mask = SCI_SR(32), | |
211 | .error_mask = SCI_DEFAULT_ERROR_MASK | SCI_ORER, | |
212 | .error_clear = SCI_ERROR_CLEAR & ~SCI_ORER, | |
61a6976b PM |
213 | }, |
214 | ||
215 | /* | |
216 | * Common SCIFA definitions. | |
217 | */ | |
218 | [SCIx_SCIFA_REGTYPE] = { | |
e095ee6b LP |
219 | .regs = { |
220 | [SCSMR] = { 0x00, 16 }, | |
221 | [SCBRR] = { 0x04, 8 }, | |
222 | [SCSCR] = { 0x08, 16 }, | |
223 | [SCxTDR] = { 0x20, 8 }, | |
224 | [SCxSR] = { 0x14, 16 }, | |
225 | [SCxRDR] = { 0x24, 8 }, | |
226 | [SCFCR] = { 0x18, 16 }, | |
227 | [SCFDR] = { 0x1c, 16 }, | |
228 | [SCPCR] = { 0x30, 16 }, | |
229 | [SCPDR] = { 0x34, 16 }, | |
230 | }, | |
b2f20ed9 LP |
231 | .fifosize = 64, |
232 | .overrun_reg = SCxSR, | |
233 | .overrun_mask = SCIFA_ORER, | |
234 | .sampling_rate_mask = SCI_SR_SCIFAB, | |
235 | .error_mask = SCIF_DEFAULT_ERROR_MASK | SCIFA_ORER, | |
236 | .error_clear = SCIF_ERROR_CLEAR & ~SCIFA_ORER, | |
61a6976b PM |
237 | }, |
238 | ||
239 | /* | |
240 | * Common SCIFB definitions. | |
241 | */ | |
242 | [SCIx_SCIFB_REGTYPE] = { | |
e095ee6b LP |
243 | .regs = { |
244 | [SCSMR] = { 0x00, 16 }, | |
245 | [SCBRR] = { 0x04, 8 }, | |
246 | [SCSCR] = { 0x08, 16 }, | |
247 | [SCxTDR] = { 0x40, 8 }, | |
248 | [SCxSR] = { 0x14, 16 }, | |
249 | [SCxRDR] = { 0x60, 8 }, | |
250 | [SCFCR] = { 0x18, 16 }, | |
251 | [SCTFDR] = { 0x38, 16 }, | |
252 | [SCRFDR] = { 0x3c, 16 }, | |
253 | [SCPCR] = { 0x30, 16 }, | |
254 | [SCPDR] = { 0x34, 16 }, | |
255 | }, | |
b2f20ed9 LP |
256 | .fifosize = 256, |
257 | .overrun_reg = SCxSR, | |
258 | .overrun_mask = SCIFA_ORER, | |
259 | .sampling_rate_mask = SCI_SR_SCIFAB, | |
260 | .error_mask = SCIF_DEFAULT_ERROR_MASK | SCIFA_ORER, | |
261 | .error_clear = SCIF_ERROR_CLEAR & ~SCIFA_ORER, | |
61a6976b PM |
262 | }, |
263 | ||
3af1f8a4 PE |
264 | /* |
265 | * Common SH-2(A) SCIF definitions for ports with FIFO data | |
266 | * count registers. | |
267 | */ | |
268 | [SCIx_SH2_SCIF_FIFODATA_REGTYPE] = { | |
e095ee6b LP |
269 | .regs = { |
270 | [SCSMR] = { 0x00, 16 }, | |
271 | [SCBRR] = { 0x04, 8 }, | |
272 | [SCSCR] = { 0x08, 16 }, | |
273 | [SCxTDR] = { 0x0c, 8 }, | |
274 | [SCxSR] = { 0x10, 16 }, | |
275 | [SCxRDR] = { 0x14, 8 }, | |
276 | [SCFCR] = { 0x18, 16 }, | |
277 | [SCFDR] = { 0x1c, 16 }, | |
278 | [SCSPTR] = { 0x20, 16 }, | |
279 | [SCLSR] = { 0x24, 16 }, | |
280 | }, | |
b2f20ed9 LP |
281 | .fifosize = 16, |
282 | .overrun_reg = SCLSR, | |
283 | .overrun_mask = SCLSR_ORER, | |
284 | .sampling_rate_mask = SCI_SR(32), | |
285 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
286 | .error_clear = SCIF_ERROR_CLEAR, | |
3af1f8a4 PE |
287 | }, |
288 | ||
61a6976b PM |
289 | /* |
290 | * Common SH-3 SCIF definitions. | |
291 | */ | |
292 | [SCIx_SH3_SCIF_REGTYPE] = { | |
e095ee6b LP |
293 | .regs = { |
294 | [SCSMR] = { 0x00, 8 }, | |
295 | [SCBRR] = { 0x02, 8 }, | |
296 | [SCSCR] = { 0x04, 8 }, | |
297 | [SCxTDR] = { 0x06, 8 }, | |
298 | [SCxSR] = { 0x08, 16 }, | |
299 | [SCxRDR] = { 0x0a, 8 }, | |
300 | [SCFCR] = { 0x0c, 8 }, | |
301 | [SCFDR] = { 0x0e, 16 }, | |
302 | }, | |
b2f20ed9 LP |
303 | .fifosize = 16, |
304 | .overrun_reg = SCLSR, | |
305 | .overrun_mask = SCLSR_ORER, | |
306 | .sampling_rate_mask = SCI_SR(32), | |
307 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
308 | .error_clear = SCIF_ERROR_CLEAR, | |
61a6976b PM |
309 | }, |
310 | ||
311 | /* | |
312 | * Common SH-4(A) SCIF(B) definitions. | |
313 | */ | |
314 | [SCIx_SH4_SCIF_REGTYPE] = { | |
e095ee6b LP |
315 | .regs = { |
316 | [SCSMR] = { 0x00, 16 }, | |
317 | [SCBRR] = { 0x04, 8 }, | |
318 | [SCSCR] = { 0x08, 16 }, | |
319 | [SCxTDR] = { 0x0c, 8 }, | |
320 | [SCxSR] = { 0x10, 16 }, | |
321 | [SCxRDR] = { 0x14, 8 }, | |
322 | [SCFCR] = { 0x18, 16 }, | |
323 | [SCFDR] = { 0x1c, 16 }, | |
324 | [SCSPTR] = { 0x20, 16 }, | |
325 | [SCLSR] = { 0x24, 16 }, | |
326 | }, | |
b2f20ed9 LP |
327 | .fifosize = 16, |
328 | .overrun_reg = SCLSR, | |
329 | .overrun_mask = SCLSR_ORER, | |
330 | .sampling_rate_mask = SCI_SR(32), | |
331 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
332 | .error_clear = SCIF_ERROR_CLEAR, | |
b8bbd6b2 GU |
333 | }, |
334 | ||
335 | /* | |
336 | * Common SCIF definitions for ports with a Baud Rate Generator for | |
337 | * External Clock (BRG). | |
338 | */ | |
339 | [SCIx_SH4_SCIF_BRG_REGTYPE] = { | |
e095ee6b LP |
340 | .regs = { |
341 | [SCSMR] = { 0x00, 16 }, | |
342 | [SCBRR] = { 0x04, 8 }, | |
343 | [SCSCR] = { 0x08, 16 }, | |
344 | [SCxTDR] = { 0x0c, 8 }, | |
345 | [SCxSR] = { 0x10, 16 }, | |
346 | [SCxRDR] = { 0x14, 8 }, | |
347 | [SCFCR] = { 0x18, 16 }, | |
348 | [SCFDR] = { 0x1c, 16 }, | |
349 | [SCSPTR] = { 0x20, 16 }, | |
350 | [SCLSR] = { 0x24, 16 }, | |
351 | [SCDL] = { 0x30, 16 }, | |
352 | [SCCKS] = { 0x34, 16 }, | |
353 | }, | |
b2f20ed9 LP |
354 | .fifosize = 16, |
355 | .overrun_reg = SCLSR, | |
356 | .overrun_mask = SCLSR_ORER, | |
357 | .sampling_rate_mask = SCI_SR(32), | |
358 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
359 | .error_clear = SCIF_ERROR_CLEAR, | |
f303b364 UH |
360 | }, |
361 | ||
362 | /* | |
363 | * Common HSCIF definitions. | |
364 | */ | |
365 | [SCIx_HSCIF_REGTYPE] = { | |
e095ee6b LP |
366 | .regs = { |
367 | [SCSMR] = { 0x00, 16 }, | |
368 | [SCBRR] = { 0x04, 8 }, | |
369 | [SCSCR] = { 0x08, 16 }, | |
370 | [SCxTDR] = { 0x0c, 8 }, | |
371 | [SCxSR] = { 0x10, 16 }, | |
372 | [SCxRDR] = { 0x14, 8 }, | |
373 | [SCFCR] = { 0x18, 16 }, | |
374 | [SCFDR] = { 0x1c, 16 }, | |
375 | [SCSPTR] = { 0x20, 16 }, | |
376 | [SCLSR] = { 0x24, 16 }, | |
377 | [HSSRR] = { 0x40, 16 }, | |
378 | [SCDL] = { 0x30, 16 }, | |
379 | [SCCKS] = { 0x34, 16 }, | |
54e14ae2 UH |
380 | [HSRTRGR] = { 0x54, 16 }, |
381 | [HSTTRGR] = { 0x58, 16 }, | |
e095ee6b | 382 | }, |
b2f20ed9 LP |
383 | .fifosize = 128, |
384 | .overrun_reg = SCLSR, | |
385 | .overrun_mask = SCLSR_ORER, | |
386 | .sampling_rate_mask = SCI_SR_RANGE(8, 32), | |
387 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
388 | .error_clear = SCIF_ERROR_CLEAR, | |
61a6976b PM |
389 | }, |
390 | ||
391 | /* | |
392 | * Common SH-4(A) SCIF(B) definitions for ports without an SCSPTR | |
393 | * register. | |
394 | */ | |
395 | [SCIx_SH4_SCIF_NO_SCSPTR_REGTYPE] = { | |
e095ee6b LP |
396 | .regs = { |
397 | [SCSMR] = { 0x00, 16 }, | |
398 | [SCBRR] = { 0x04, 8 }, | |
399 | [SCSCR] = { 0x08, 16 }, | |
400 | [SCxTDR] = { 0x0c, 8 }, | |
401 | [SCxSR] = { 0x10, 16 }, | |
402 | [SCxRDR] = { 0x14, 8 }, | |
403 | [SCFCR] = { 0x18, 16 }, | |
404 | [SCFDR] = { 0x1c, 16 }, | |
405 | [SCLSR] = { 0x24, 16 }, | |
406 | }, | |
b2f20ed9 LP |
407 | .fifosize = 16, |
408 | .overrun_reg = SCLSR, | |
409 | .overrun_mask = SCLSR_ORER, | |
410 | .sampling_rate_mask = SCI_SR(32), | |
411 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
412 | .error_clear = SCIF_ERROR_CLEAR, | |
61a6976b PM |
413 | }, |
414 | ||
415 | /* | |
416 | * Common SH-4(A) SCIF(B) definitions for ports with FIFO data | |
417 | * count registers. | |
418 | */ | |
419 | [SCIx_SH4_SCIF_FIFODATA_REGTYPE] = { | |
e095ee6b LP |
420 | .regs = { |
421 | [SCSMR] = { 0x00, 16 }, | |
422 | [SCBRR] = { 0x04, 8 }, | |
423 | [SCSCR] = { 0x08, 16 }, | |
424 | [SCxTDR] = { 0x0c, 8 }, | |
425 | [SCxSR] = { 0x10, 16 }, | |
426 | [SCxRDR] = { 0x14, 8 }, | |
427 | [SCFCR] = { 0x18, 16 }, | |
428 | [SCFDR] = { 0x1c, 16 }, | |
429 | [SCTFDR] = { 0x1c, 16 }, /* aliased to SCFDR */ | |
430 | [SCRFDR] = { 0x20, 16 }, | |
431 | [SCSPTR] = { 0x24, 16 }, | |
432 | [SCLSR] = { 0x28, 16 }, | |
433 | }, | |
b2f20ed9 LP |
434 | .fifosize = 16, |
435 | .overrun_reg = SCLSR, | |
436 | .overrun_mask = SCLSR_ORER, | |
437 | .sampling_rate_mask = SCI_SR(32), | |
438 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
439 | .error_clear = SCIF_ERROR_CLEAR, | |
61a6976b PM |
440 | }, |
441 | ||
442 | /* | |
443 | * SH7705-style SCIF(B) ports, lacking both SCSPTR and SCLSR | |
444 | * registers. | |
445 | */ | |
446 | [SCIx_SH7705_SCIF_REGTYPE] = { | |
e095ee6b LP |
447 | .regs = { |
448 | [SCSMR] = { 0x00, 16 }, | |
449 | [SCBRR] = { 0x04, 8 }, | |
450 | [SCSCR] = { 0x08, 16 }, | |
451 | [SCxTDR] = { 0x20, 8 }, | |
452 | [SCxSR] = { 0x14, 16 }, | |
453 | [SCxRDR] = { 0x24, 8 }, | |
454 | [SCFCR] = { 0x18, 16 }, | |
455 | [SCFDR] = { 0x1c, 16 }, | |
456 | }, | |
18e8cf15 | 457 | .fifosize = 64, |
b2f20ed9 LP |
458 | .overrun_reg = SCxSR, |
459 | .overrun_mask = SCIFA_ORER, | |
460 | .sampling_rate_mask = SCI_SR(16), | |
461 | .error_mask = SCIF_DEFAULT_ERROR_MASK | SCIFA_ORER, | |
462 | .error_clear = SCIF_ERROR_CLEAR & ~SCIFA_ORER, | |
61a6976b PM |
463 | }, |
464 | }; | |
465 | ||
e095ee6b | 466 | #define sci_getreg(up, offset) (&to_sci_port(up)->params->regs[offset]) |
72b294cf | 467 | |
61a6976b PM |
468 | /* |
469 | * The "offset" here is rather misleading, in that it refers to an enum | |
470 | * value relative to the port mapping rather than the fixed offset | |
471 | * itself, which needs to be manually retrieved from the platform's | |
472 | * register map for the given port. | |
473 | */ | |
474 | static unsigned int sci_serial_in(struct uart_port *p, int offset) | |
475 | { | |
d3184e68 | 476 | const struct plat_sci_reg *reg = sci_getreg(p, offset); |
61a6976b PM |
477 | |
478 | if (reg->size == 8) | |
479 | return ioread8(p->membase + (reg->offset << p->regshift)); | |
480 | else if (reg->size == 16) | |
481 | return ioread16(p->membase + (reg->offset << p->regshift)); | |
482 | else | |
483 | WARN(1, "Invalid register access\n"); | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | static void sci_serial_out(struct uart_port *p, int offset, int value) | |
489 | { | |
d3184e68 | 490 | const struct plat_sci_reg *reg = sci_getreg(p, offset); |
61a6976b PM |
491 | |
492 | if (reg->size == 8) | |
493 | iowrite8(value, p->membase + (reg->offset << p->regshift)); | |
494 | else if (reg->size == 16) | |
495 | iowrite16(value, p->membase + (reg->offset << p->regshift)); | |
496 | else | |
497 | WARN(1, "Invalid register access\n"); | |
498 | } | |
499 | ||
23241d43 PM |
500 | static void sci_port_enable(struct sci_port *sci_port) |
501 | { | |
f4998e55 GU |
502 | unsigned int i; |
503 | ||
23241d43 PM |
504 | if (!sci_port->port.dev) |
505 | return; | |
506 | ||
507 | pm_runtime_get_sync(sci_port->port.dev); | |
508 | ||
f4998e55 GU |
509 | for (i = 0; i < SCI_NUM_CLKS; i++) { |
510 | clk_prepare_enable(sci_port->clks[i]); | |
511 | sci_port->clk_rates[i] = clk_get_rate(sci_port->clks[i]); | |
512 | } | |
513 | sci_port->port.uartclk = sci_port->clk_rates[SCI_FCK]; | |
23241d43 PM |
514 | } |
515 | ||
516 | static void sci_port_disable(struct sci_port *sci_port) | |
517 | { | |
f4998e55 GU |
518 | unsigned int i; |
519 | ||
23241d43 PM |
520 | if (!sci_port->port.dev) |
521 | return; | |
522 | ||
f4998e55 GU |
523 | for (i = SCI_NUM_CLKS; i-- > 0; ) |
524 | clk_disable_unprepare(sci_port->clks[i]); | |
23241d43 PM |
525 | |
526 | pm_runtime_put_sync(sci_port->port.dev); | |
527 | } | |
528 | ||
e1910fcd GU |
529 | static inline unsigned long port_rx_irq_mask(struct uart_port *port) |
530 | { | |
531 | /* | |
532 | * Not all ports (such as SCIFA) will support REIE. Rather than | |
533 | * special-casing the port type, we check the port initialization | |
534 | * IRQ enable mask to see whether the IRQ is desired at all. If | |
535 | * it's unset, it's logically inferred that there's no point in | |
536 | * testing for it. | |
537 | */ | |
538 | return SCSCR_RIE | (to_sci_port(port)->cfg->scscr & SCSCR_REIE); | |
539 | } | |
540 | ||
541 | static void sci_start_tx(struct uart_port *port) | |
542 | { | |
543 | struct sci_port *s = to_sci_port(port); | |
544 | unsigned short ctrl; | |
545 | ||
546 | #ifdef CONFIG_SERIAL_SH_SCI_DMA | |
547 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
548 | u16 new, scr = serial_port_in(port, SCSCR); | |
549 | if (s->chan_tx) | |
550 | new = scr | SCSCR_TDRQE; | |
551 | else | |
552 | new = scr & ~SCSCR_TDRQE; | |
553 | if (new != scr) | |
554 | serial_port_out(port, SCSCR, new); | |
555 | } | |
556 | ||
557 | if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) && | |
558 | dma_submit_error(s->cookie_tx)) { | |
559 | s->cookie_tx = 0; | |
560 | schedule_work(&s->work_tx); | |
561 | } | |
562 | #endif | |
563 | ||
564 | if (!s->chan_tx || port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
565 | /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */ | |
566 | ctrl = serial_port_in(port, SCSCR); | |
567 | serial_port_out(port, SCSCR, ctrl | SCSCR_TIE); | |
568 | } | |
569 | } | |
570 | ||
571 | static void sci_stop_tx(struct uart_port *port) | |
572 | { | |
573 | unsigned short ctrl; | |
574 | ||
575 | /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */ | |
576 | ctrl = serial_port_in(port, SCSCR); | |
577 | ||
578 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) | |
579 | ctrl &= ~SCSCR_TDRQE; | |
580 | ||
581 | ctrl &= ~SCSCR_TIE; | |
582 | ||
583 | serial_port_out(port, SCSCR, ctrl); | |
584 | } | |
585 | ||
586 | static void sci_start_rx(struct uart_port *port) | |
587 | { | |
588 | unsigned short ctrl; | |
589 | ||
590 | ctrl = serial_port_in(port, SCSCR) | port_rx_irq_mask(port); | |
591 | ||
592 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) | |
593 | ctrl &= ~SCSCR_RDRQE; | |
594 | ||
595 | serial_port_out(port, SCSCR, ctrl); | |
596 | } | |
597 | ||
598 | static void sci_stop_rx(struct uart_port *port) | |
599 | { | |
600 | unsigned short ctrl; | |
601 | ||
602 | ctrl = serial_port_in(port, SCSCR); | |
603 | ||
604 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) | |
605 | ctrl &= ~SCSCR_RDRQE; | |
606 | ||
607 | ctrl &= ~port_rx_irq_mask(port); | |
608 | ||
609 | serial_port_out(port, SCSCR, ctrl); | |
610 | } | |
611 | ||
a1b5b43f GU |
612 | static void sci_clear_SCxSR(struct uart_port *port, unsigned int mask) |
613 | { | |
614 | if (port->type == PORT_SCI) { | |
615 | /* Just store the mask */ | |
616 | serial_port_out(port, SCxSR, mask); | |
b2f20ed9 | 617 | } else if (to_sci_port(port)->params->overrun_mask == SCIFA_ORER) { |
a1b5b43f GU |
618 | /* SCIFA/SCIFB and SCIF on SH7705/SH7720/SH7721 */ |
619 | /* Only clear the status bits we want to clear */ | |
620 | serial_port_out(port, SCxSR, | |
621 | serial_port_in(port, SCxSR) & mask); | |
622 | } else { | |
623 | /* Store the mask, clear parity/framing errors */ | |
624 | serial_port_out(port, SCxSR, mask & ~(SCIF_FERC | SCIF_PERC)); | |
625 | } | |
626 | } | |
627 | ||
0b0cced1 YS |
628 | #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || \ |
629 | defined(CONFIG_SERIAL_SH_SCI_EARLYCON) | |
1f6fd5c9 PM |
630 | |
631 | #ifdef CONFIG_CONSOLE_POLL | |
07d2a1a1 | 632 | static int sci_poll_get_char(struct uart_port *port) |
1da177e4 | 633 | { |
1da177e4 LT |
634 | unsigned short status; |
635 | int c; | |
636 | ||
e108b2ca | 637 | do { |
b12bb29f | 638 | status = serial_port_in(port, SCxSR); |
1da177e4 | 639 | if (status & SCxSR_ERRORS(port)) { |
a1b5b43f | 640 | sci_clear_SCxSR(port, SCxSR_ERROR_CLEAR(port)); |
1da177e4 LT |
641 | continue; |
642 | } | |
3f255eb3 JW |
643 | break; |
644 | } while (1); | |
645 | ||
646 | if (!(status & SCxSR_RDxF(port))) | |
647 | return NO_POLL_CHAR; | |
07d2a1a1 | 648 | |
b12bb29f | 649 | c = serial_port_in(port, SCxRDR); |
07d2a1a1 | 650 | |
e7c98dc7 | 651 | /* Dummy read */ |
b12bb29f | 652 | serial_port_in(port, SCxSR); |
a1b5b43f | 653 | sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port)); |
1da177e4 LT |
654 | |
655 | return c; | |
656 | } | |
1f6fd5c9 | 657 | #endif |
1da177e4 | 658 | |
07d2a1a1 | 659 | static void sci_poll_put_char(struct uart_port *port, unsigned char c) |
1da177e4 | 660 | { |
1da177e4 LT |
661 | unsigned short status; |
662 | ||
1da177e4 | 663 | do { |
b12bb29f | 664 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
665 | } while (!(status & SCxSR_TDxE(port))); |
666 | ||
b12bb29f | 667 | serial_port_out(port, SCxTDR, c); |
a1b5b43f | 668 | sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port)); |
1da177e4 | 669 | } |
0b0cced1 YS |
670 | #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE || |
671 | CONFIG_SERIAL_SH_SCI_EARLYCON */ | |
1da177e4 | 672 | |
61a6976b | 673 | static void sci_init_pins(struct uart_port *port, unsigned int cflag) |
1da177e4 | 674 | { |
61a6976b | 675 | struct sci_port *s = to_sci_port(port); |
1da177e4 | 676 | |
61a6976b PM |
677 | /* |
678 | * Use port-specific handler if provided. | |
679 | */ | |
680 | if (s->cfg->ops && s->cfg->ops->init_pins) { | |
681 | s->cfg->ops->init_pins(port, cflag); | |
682 | return; | |
1da177e4 | 683 | } |
41504c39 | 684 | |
e9d7a45a | 685 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
cfa6eb23 | 686 | u16 data = serial_port_in(port, SCPDR); |
e9d7a45a GU |
687 | u16 ctrl = serial_port_in(port, SCPCR); |
688 | ||
689 | /* Enable RXD and TXD pin functions */ | |
690 | ctrl &= ~(SCPCR_RXDC | SCPCR_TXDC); | |
97ed9790 | 691 | if (to_sci_port(port)->has_rtscts) { |
cfa6eb23 GU |
692 | /* RTS# is output, active low, unless autorts */ |
693 | if (!(port->mctrl & TIOCM_RTS)) { | |
694 | ctrl |= SCPCR_RTSC; | |
695 | data |= SCPDR_RTSD; | |
696 | } else if (!s->autorts) { | |
697 | ctrl |= SCPCR_RTSC; | |
698 | data &= ~SCPDR_RTSD; | |
699 | } else { | |
700 | /* Enable RTS# pin function */ | |
701 | ctrl &= ~SCPCR_RTSC; | |
702 | } | |
e9d7a45a GU |
703 | /* Enable CTS# pin function */ |
704 | ctrl &= ~SCPCR_CTSC; | |
705 | } | |
cfa6eb23 | 706 | serial_port_out(port, SCPDR, data); |
e9d7a45a GU |
707 | serial_port_out(port, SCPCR, ctrl); |
708 | } else if (sci_getreg(port, SCSPTR)->size) { | |
d2b9775d GU |
709 | u16 status = serial_port_in(port, SCSPTR); |
710 | ||
cfa6eb23 GU |
711 | /* RTS# is always output; and active low, unless autorts */ |
712 | status |= SCSPTR_RTSIO; | |
713 | if (!(port->mctrl & TIOCM_RTS)) | |
714 | status |= SCSPTR_RTSDT; | |
715 | else if (!s->autorts) | |
716 | status &= ~SCSPTR_RTSDT; | |
d2b9775d GU |
717 | /* CTS# and SCK are inputs */ |
718 | status &= ~(SCSPTR_CTSIO | SCSPTR_SCKIO); | |
719 | serial_port_out(port, SCSPTR, status); | |
faf02f8f | 720 | } |
d5701647 | 721 | } |
e108b2ca | 722 | |
72b294cf | 723 | static int sci_txfill(struct uart_port *port) |
e108b2ca | 724 | { |
b2f20ed9 LP |
725 | struct sci_port *s = to_sci_port(port); |
726 | unsigned int fifo_mask = (s->params->fifosize << 1) - 1; | |
d3184e68 | 727 | const struct plat_sci_reg *reg; |
e108b2ca | 728 | |
72b294cf PM |
729 | reg = sci_getreg(port, SCTFDR); |
730 | if (reg->size) | |
b2f20ed9 | 731 | return serial_port_in(port, SCTFDR) & fifo_mask; |
c63847a3 | 732 | |
72b294cf PM |
733 | reg = sci_getreg(port, SCFDR); |
734 | if (reg->size) | |
b12bb29f | 735 | return serial_port_in(port, SCFDR) >> 8; |
d1d4b10c | 736 | |
b12bb29f | 737 | return !(serial_port_in(port, SCxSR) & SCI_TDRE); |
e108b2ca PM |
738 | } |
739 | ||
73a19e4c GL |
740 | static int sci_txroom(struct uart_port *port) |
741 | { | |
72b294cf | 742 | return port->fifosize - sci_txfill(port); |
73a19e4c GL |
743 | } |
744 | ||
745 | static int sci_rxfill(struct uart_port *port) | |
e108b2ca | 746 | { |
b2f20ed9 LP |
747 | struct sci_port *s = to_sci_port(port); |
748 | unsigned int fifo_mask = (s->params->fifosize << 1) - 1; | |
d3184e68 | 749 | const struct plat_sci_reg *reg; |
72b294cf PM |
750 | |
751 | reg = sci_getreg(port, SCRFDR); | |
752 | if (reg->size) | |
b2f20ed9 | 753 | return serial_port_in(port, SCRFDR) & fifo_mask; |
72b294cf PM |
754 | |
755 | reg = sci_getreg(port, SCFDR); | |
756 | if (reg->size) | |
b2f20ed9 | 757 | return serial_port_in(port, SCFDR) & fifo_mask; |
72b294cf | 758 | |
b12bb29f | 759 | return (serial_port_in(port, SCxSR) & SCxSR_RDxF(port)) != 0; |
e108b2ca PM |
760 | } |
761 | ||
1da177e4 LT |
762 | /* ********************************************************************** * |
763 | * the interrupt related routines * | |
764 | * ********************************************************************** */ | |
765 | ||
766 | static void sci_transmit_chars(struct uart_port *port) | |
767 | { | |
ebd2c8f6 | 768 | struct circ_buf *xmit = &port->state->xmit; |
1da177e4 | 769 | unsigned int stopped = uart_tx_stopped(port); |
1da177e4 LT |
770 | unsigned short status; |
771 | unsigned short ctrl; | |
e108b2ca | 772 | int count; |
1da177e4 | 773 | |
b12bb29f | 774 | status = serial_port_in(port, SCxSR); |
1da177e4 | 775 | if (!(status & SCxSR_TDxE(port))) { |
b12bb29f | 776 | ctrl = serial_port_in(port, SCSCR); |
e7c98dc7 | 777 | if (uart_circ_empty(xmit)) |
8e698614 | 778 | ctrl &= ~SCSCR_TIE; |
e7c98dc7 | 779 | else |
8e698614 | 780 | ctrl |= SCSCR_TIE; |
b12bb29f | 781 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
782 | return; |
783 | } | |
784 | ||
72b294cf | 785 | count = sci_txroom(port); |
1da177e4 LT |
786 | |
787 | do { | |
788 | unsigned char c; | |
789 | ||
790 | if (port->x_char) { | |
791 | c = port->x_char; | |
792 | port->x_char = 0; | |
793 | } else if (!uart_circ_empty(xmit) && !stopped) { | |
794 | c = xmit->buf[xmit->tail]; | |
795 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
796 | } else { | |
797 | break; | |
798 | } | |
799 | ||
b12bb29f | 800 | serial_port_out(port, SCxTDR, c); |
1da177e4 LT |
801 | |
802 | port->icount.tx++; | |
803 | } while (--count > 0); | |
804 | ||
a1b5b43f | 805 | sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port)); |
1da177e4 LT |
806 | |
807 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
808 | uart_write_wakeup(port); | |
809 | if (uart_circ_empty(xmit)) { | |
b129a8cc | 810 | sci_stop_tx(port); |
1da177e4 | 811 | } else { |
b12bb29f | 812 | ctrl = serial_port_in(port, SCSCR); |
1da177e4 | 813 | |
1a22f08d | 814 | if (port->type != PORT_SCI) { |
b12bb29f | 815 | serial_port_in(port, SCxSR); /* Dummy read */ |
a1b5b43f | 816 | sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port)); |
1da177e4 | 817 | } |
1da177e4 | 818 | |
8e698614 | 819 | ctrl |= SCSCR_TIE; |
b12bb29f | 820 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
821 | } |
822 | } | |
823 | ||
824 | /* On SH3, SCIF may read end-of-break as a space->mark char */ | |
e7c98dc7 | 825 | #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); }) |
1da177e4 | 826 | |
94c8b6db | 827 | static void sci_receive_chars(struct uart_port *port) |
1da177e4 | 828 | { |
227434f8 | 829 | struct tty_port *tport = &port->state->port; |
1da177e4 LT |
830 | int i, count, copied = 0; |
831 | unsigned short status; | |
33f0f88f | 832 | unsigned char flag; |
1da177e4 | 833 | |
b12bb29f | 834 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
835 | if (!(status & SCxSR_RDxF(port))) |
836 | return; | |
837 | ||
838 | while (1) { | |
1da177e4 | 839 | /* Don't copy more bytes than there is room for in the buffer */ |
227434f8 | 840 | count = tty_buffer_request_room(tport, sci_rxfill(port)); |
1da177e4 LT |
841 | |
842 | /* If for any reason we can't copy more data, we're done! */ | |
843 | if (count == 0) | |
844 | break; | |
845 | ||
846 | if (port->type == PORT_SCI) { | |
b12bb29f | 847 | char c = serial_port_in(port, SCxRDR); |
d5cb1319 | 848 | if (uart_handle_sysrq_char(port, c)) |
1da177e4 | 849 | count = 0; |
e7c98dc7 | 850 | else |
92a19f9c | 851 | tty_insert_flip_char(tport, c, TTY_NORMAL); |
1da177e4 | 852 | } else { |
e7c98dc7 | 853 | for (i = 0; i < count; i++) { |
b12bb29f | 854 | char c = serial_port_in(port, SCxRDR); |
d97fbbed | 855 | |
b12bb29f | 856 | status = serial_port_in(port, SCxSR); |
7d12e780 | 857 | if (uart_handle_sysrq_char(port, c)) { |
1da177e4 LT |
858 | count--; i--; |
859 | continue; | |
860 | } | |
861 | ||
862 | /* Store data and status */ | |
73a19e4c | 863 | if (status & SCxSR_FER(port)) { |
33f0f88f | 864 | flag = TTY_FRAME; |
d97fbbed | 865 | port->icount.frame++; |
762c69e3 | 866 | dev_notice(port->dev, "frame error\n"); |
73a19e4c | 867 | } else if (status & SCxSR_PER(port)) { |
33f0f88f | 868 | flag = TTY_PARITY; |
d97fbbed | 869 | port->icount.parity++; |
762c69e3 | 870 | dev_notice(port->dev, "parity error\n"); |
33f0f88f AC |
871 | } else |
872 | flag = TTY_NORMAL; | |
762c69e3 | 873 | |
92a19f9c | 874 | tty_insert_flip_char(tport, c, flag); |
1da177e4 LT |
875 | } |
876 | } | |
877 | ||
b12bb29f | 878 | serial_port_in(port, SCxSR); /* dummy read */ |
a1b5b43f | 879 | sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port)); |
1da177e4 | 880 | |
1da177e4 LT |
881 | copied += count; |
882 | port->icount.rx += count; | |
883 | } | |
884 | ||
885 | if (copied) { | |
886 | /* Tell the rest of the system the news. New characters! */ | |
2e124b4a | 887 | tty_flip_buffer_push(tport); |
1da177e4 | 888 | } else { |
b12bb29f | 889 | serial_port_in(port, SCxSR); /* dummy read */ |
a1b5b43f | 890 | sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port)); |
1da177e4 LT |
891 | } |
892 | } | |
893 | ||
94c8b6db | 894 | static int sci_handle_errors(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; |
debf9507 | 899 | struct sci_port *s = to_sci_port(port); |
1da177e4 | 900 | |
3ae988d9 | 901 | /* Handle overruns */ |
b2f20ed9 | 902 | if (status & s->params->overrun_mask) { |
3ae988d9 | 903 | port->icount.overrun++; |
d97fbbed | 904 | |
3ae988d9 LP |
905 | /* overrun error */ |
906 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN)) | |
907 | copied++; | |
762c69e3 | 908 | |
9b971cd2 | 909 | dev_notice(port->dev, "overrun error\n"); |
1da177e4 LT |
910 | } |
911 | ||
e108b2ca | 912 | if (status & SCxSR_FER(port)) { |
d5cb1319 LP |
913 | /* frame error */ |
914 | port->icount.frame++; | |
d97fbbed | 915 | |
d5cb1319 LP |
916 | if (tty_insert_flip_char(tport, 0, TTY_FRAME)) |
917 | copied++; | |
762c69e3 | 918 | |
d5cb1319 | 919 | dev_notice(port->dev, "frame error\n"); |
1da177e4 LT |
920 | } |
921 | ||
e108b2ca | 922 | if (status & SCxSR_PER(port)) { |
1da177e4 | 923 | /* parity error */ |
d97fbbed PM |
924 | port->icount.parity++; |
925 | ||
92a19f9c | 926 | if (tty_insert_flip_char(tport, 0, TTY_PARITY)) |
e108b2ca | 927 | copied++; |
762c69e3 | 928 | |
9b971cd2 | 929 | dev_notice(port->dev, "parity error\n"); |
1da177e4 LT |
930 | } |
931 | ||
33f0f88f | 932 | if (copied) |
2e124b4a | 933 | tty_flip_buffer_push(tport); |
1da177e4 LT |
934 | |
935 | return copied; | |
936 | } | |
937 | ||
94c8b6db | 938 | static int sci_handle_fifo_overrun(struct uart_port *port) |
d830fa45 | 939 | { |
92a19f9c | 940 | struct tty_port *tport = &port->state->port; |
debf9507 | 941 | struct sci_port *s = to_sci_port(port); |
d3184e68 | 942 | const struct plat_sci_reg *reg; |
2e0842a1 | 943 | int copied = 0; |
75c249fd | 944 | u16 status; |
d830fa45 | 945 | |
b2f20ed9 | 946 | reg = sci_getreg(port, s->params->overrun_reg); |
4b8c59a3 | 947 | if (!reg->size) |
d830fa45 PM |
948 | return 0; |
949 | ||
b2f20ed9 LP |
950 | status = serial_port_in(port, s->params->overrun_reg); |
951 | if (status & s->params->overrun_mask) { | |
952 | status &= ~s->params->overrun_mask; | |
953 | serial_port_out(port, s->params->overrun_reg, status); | |
d830fa45 | 954 | |
d97fbbed PM |
955 | port->icount.overrun++; |
956 | ||
92a19f9c | 957 | tty_insert_flip_char(tport, 0, TTY_OVERRUN); |
2e124b4a | 958 | tty_flip_buffer_push(tport); |
d830fa45 | 959 | |
51b31f1c | 960 | dev_dbg(port->dev, "overrun error\n"); |
d830fa45 PM |
961 | copied++; |
962 | } | |
963 | ||
964 | return copied; | |
965 | } | |
966 | ||
94c8b6db | 967 | static int sci_handle_breaks(struct uart_port *port) |
1da177e4 LT |
968 | { |
969 | int copied = 0; | |
b12bb29f | 970 | unsigned short status = serial_port_in(port, SCxSR); |
92a19f9c | 971 | struct tty_port *tport = &port->state->port; |
1da177e4 | 972 | |
0b3d4ef6 PM |
973 | if (uart_handle_break(port)) |
974 | return 0; | |
975 | ||
d5cb1319 | 976 | if (status & SCxSR_BRK(port)) { |
d97fbbed PM |
977 | port->icount.brk++; |
978 | ||
1da177e4 | 979 | /* Notify of BREAK */ |
92a19f9c | 980 | if (tty_insert_flip_char(tport, 0, TTY_BREAK)) |
33f0f88f | 981 | copied++; |
762c69e3 PM |
982 | |
983 | dev_dbg(port->dev, "BREAK detected\n"); | |
1da177e4 LT |
984 | } |
985 | ||
33f0f88f | 986 | if (copied) |
2e124b4a | 987 | tty_flip_buffer_push(tport); |
e108b2ca | 988 | |
d830fa45 PM |
989 | copied += sci_handle_fifo_overrun(port); |
990 | ||
1da177e4 LT |
991 | return copied; |
992 | } | |
993 | ||
a380ed46 UH |
994 | static int scif_set_rtrg(struct uart_port *port, int rx_trig) |
995 | { | |
996 | unsigned int bits; | |
997 | ||
998 | if (rx_trig < 1) | |
999 | rx_trig = 1; | |
1000 | if (rx_trig >= port->fifosize) | |
1001 | rx_trig = port->fifosize; | |
1002 | ||
1003 | /* HSCIF can be set to an arbitrary level. */ | |
1004 | if (sci_getreg(port, HSRTRGR)->size) { | |
1005 | serial_port_out(port, HSRTRGR, rx_trig); | |
1006 | return rx_trig; | |
1007 | } | |
1008 | ||
1009 | switch (port->type) { | |
1010 | case PORT_SCIF: | |
1011 | if (rx_trig < 4) { | |
1012 | bits = 0; | |
1013 | rx_trig = 1; | |
1014 | } else if (rx_trig < 8) { | |
1015 | bits = SCFCR_RTRG0; | |
1016 | rx_trig = 4; | |
1017 | } else if (rx_trig < 14) { | |
1018 | bits = SCFCR_RTRG1; | |
1019 | rx_trig = 8; | |
1020 | } else { | |
1021 | bits = SCFCR_RTRG0 | SCFCR_RTRG1; | |
1022 | rx_trig = 14; | |
1023 | } | |
1024 | break; | |
1025 | case PORT_SCIFA: | |
1026 | case PORT_SCIFB: | |
1027 | if (rx_trig < 16) { | |
1028 | bits = 0; | |
1029 | rx_trig = 1; | |
1030 | } else if (rx_trig < 32) { | |
1031 | bits = SCFCR_RTRG0; | |
1032 | rx_trig = 16; | |
1033 | } else if (rx_trig < 48) { | |
1034 | bits = SCFCR_RTRG1; | |
1035 | rx_trig = 32; | |
1036 | } else { | |
1037 | bits = SCFCR_RTRG0 | SCFCR_RTRG1; | |
1038 | rx_trig = 48; | |
1039 | } | |
1040 | break; | |
1041 | default: | |
1042 | WARN(1, "unknown FIFO configuration"); | |
1043 | return 1; | |
1044 | } | |
1045 | ||
1046 | serial_port_out(port, SCFCR, | |
1047 | (serial_port_in(port, SCFCR) & | |
1048 | ~(SCFCR_RTRG1 | SCFCR_RTRG0)) | bits); | |
1049 | ||
1050 | return rx_trig; | |
1051 | } | |
1052 | ||
03940376 UH |
1053 | static int scif_rtrg_enabled(struct uart_port *port) |
1054 | { | |
1055 | if (sci_getreg(port, HSRTRGR)->size) | |
1056 | return serial_port_in(port, HSRTRGR) != 0; | |
1057 | else | |
1058 | return (serial_port_in(port, SCFCR) & | |
1059 | (SCFCR_RTRG0 | SCFCR_RTRG1)) != 0; | |
1060 | } | |
1061 | ||
1062 | static void rx_fifo_timer_fn(unsigned long arg) | |
1063 | { | |
1064 | struct sci_port *s = (struct sci_port *)arg; | |
1065 | struct uart_port *port = &s->port; | |
1066 | ||
1067 | dev_dbg(port->dev, "Rx timed out\n"); | |
1068 | scif_set_rtrg(port, 1); | |
1069 | } | |
1070 | ||
5d23188a UH |
1071 | static ssize_t rx_trigger_show(struct device *dev, |
1072 | struct device_attribute *attr, | |
1073 | char *buf) | |
1074 | { | |
1075 | struct uart_port *port = dev_get_drvdata(dev); | |
1076 | struct sci_port *sci = to_sci_port(port); | |
1077 | ||
1078 | return sprintf(buf, "%d\n", sci->rx_trigger); | |
1079 | } | |
1080 | ||
1081 | static ssize_t rx_trigger_store(struct device *dev, | |
1082 | struct device_attribute *attr, | |
1083 | const char *buf, | |
1084 | size_t count) | |
1085 | { | |
1086 | struct uart_port *port = dev_get_drvdata(dev); | |
1087 | struct sci_port *sci = to_sci_port(port); | |
4ab3c51e | 1088 | int ret; |
5d23188a UH |
1089 | long r; |
1090 | ||
4ab3c51e DC |
1091 | ret = kstrtol(buf, 0, &r); |
1092 | if (ret) | |
1093 | return ret; | |
90afa525 | 1094 | |
5d23188a | 1095 | sci->rx_trigger = scif_set_rtrg(port, r); |
90afa525 UH |
1096 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
1097 | scif_set_rtrg(port, 1); | |
1098 | ||
5d23188a UH |
1099 | return count; |
1100 | } | |
1101 | ||
1102 | static DEVICE_ATTR(rx_fifo_trigger, 0644, rx_trigger_show, rx_trigger_store); | |
1103 | ||
1104 | static ssize_t rx_fifo_timeout_show(struct device *dev, | |
1105 | struct device_attribute *attr, | |
1106 | char *buf) | |
1107 | { | |
1108 | struct uart_port *port = dev_get_drvdata(dev); | |
1109 | struct sci_port *sci = to_sci_port(port); | |
1110 | ||
1111 | return sprintf(buf, "%d\n", sci->rx_fifo_timeout); | |
1112 | } | |
1113 | ||
1114 | static ssize_t rx_fifo_timeout_store(struct device *dev, | |
1115 | struct device_attribute *attr, | |
1116 | const char *buf, | |
1117 | size_t count) | |
1118 | { | |
1119 | struct uart_port *port = dev_get_drvdata(dev); | |
1120 | struct sci_port *sci = to_sci_port(port); | |
4ab3c51e | 1121 | int ret; |
5d23188a UH |
1122 | long r; |
1123 | ||
4ab3c51e DC |
1124 | ret = kstrtol(buf, 0, &r); |
1125 | if (ret) | |
1126 | return ret; | |
5d23188a UH |
1127 | sci->rx_fifo_timeout = r; |
1128 | scif_set_rtrg(port, 1); | |
1129 | if (r > 0) | |
1130 | setup_timer(&sci->rx_fifo_timer, rx_fifo_timer_fn, | |
1131 | (unsigned long)sci); | |
1132 | return count; | |
1133 | } | |
1134 | ||
1135 | static DEVICE_ATTR(rx_fifo_timeout, 0644, rx_fifo_timeout_show, rx_fifo_timeout_store); | |
1136 | ||
1137 | ||
73a19e4c | 1138 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
e1910fcd GU |
1139 | static void sci_dma_tx_complete(void *arg) |
1140 | { | |
1141 | struct sci_port *s = arg; | |
1142 | struct uart_port *port = &s->port; | |
1143 | struct circ_buf *xmit = &port->state->xmit; | |
1144 | unsigned long flags; | |
73a19e4c | 1145 | |
e1910fcd | 1146 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
73a19e4c | 1147 | |
e1910fcd | 1148 | spin_lock_irqsave(&port->lock, flags); |
73a19e4c | 1149 | |
e1910fcd GU |
1150 | xmit->tail += s->tx_dma_len; |
1151 | xmit->tail &= UART_XMIT_SIZE - 1; | |
73a19e4c | 1152 | |
e1910fcd | 1153 | port->icount.tx += s->tx_dma_len; |
1da177e4 | 1154 | |
e1910fcd GU |
1155 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
1156 | uart_write_wakeup(port); | |
1da177e4 | 1157 | |
e1910fcd GU |
1158 | if (!uart_circ_empty(xmit)) { |
1159 | s->cookie_tx = 0; | |
1160 | schedule_work(&s->work_tx); | |
1161 | } else { | |
1162 | s->cookie_tx = -EINVAL; | |
1163 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1164 | u16 ctrl = serial_port_in(port, SCSCR); | |
1165 | serial_port_out(port, SCSCR, ctrl & ~SCSCR_TIE); | |
1166 | } | |
1167 | } | |
1da177e4 | 1168 | |
fd78a76a | 1169 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
1170 | } |
1171 | ||
e1910fcd GU |
1172 | /* Locking: called with port lock held */ |
1173 | static int sci_dma_rx_push(struct sci_port *s, void *buf, size_t count) | |
1da177e4 | 1174 | { |
e1910fcd GU |
1175 | struct uart_port *port = &s->port; |
1176 | struct tty_port *tport = &port->state->port; | |
1177 | int copied; | |
1da177e4 | 1178 | |
e1910fcd | 1179 | copied = tty_insert_flip_string(tport, buf, count); |
6fc5a520 | 1180 | if (copied < count) |
e1910fcd | 1181 | port->icount.buf_overrun++; |
1da177e4 | 1182 | |
e1910fcd | 1183 | port->icount.rx += copied; |
1da177e4 | 1184 | |
e1910fcd | 1185 | return copied; |
1da177e4 LT |
1186 | } |
1187 | ||
e1910fcd | 1188 | static int sci_dma_rx_find_active(struct sci_port *s) |
1da177e4 | 1189 | { |
e1910fcd | 1190 | unsigned int i; |
1da177e4 | 1191 | |
e1910fcd GU |
1192 | for (i = 0; i < ARRAY_SIZE(s->cookie_rx); i++) |
1193 | if (s->active_rx == s->cookie_rx[i]) | |
1194 | return i; | |
1da177e4 | 1195 | |
e1910fcd | 1196 | return -1; |
1da177e4 LT |
1197 | } |
1198 | ||
e1910fcd | 1199 | static void sci_rx_dma_release(struct sci_port *s, bool enable_pio) |
f43dc23d | 1200 | { |
e1910fcd GU |
1201 | struct dma_chan *chan = s->chan_rx; |
1202 | struct uart_port *port = &s->port; | |
1203 | unsigned long flags; | |
1204 | ||
1205 | spin_lock_irqsave(&port->lock, flags); | |
1206 | s->chan_rx = NULL; | |
1207 | s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL; | |
1208 | spin_unlock_irqrestore(&port->lock, flags); | |
1209 | dmaengine_terminate_all(chan); | |
1210 | dma_free_coherent(chan->device->dev, s->buf_len_rx * 2, s->rx_buf[0], | |
1211 | sg_dma_address(&s->sg_rx[0])); | |
1212 | dma_release_channel(chan); | |
1213 | if (enable_pio) | |
1214 | sci_start_rx(port); | |
f43dc23d PM |
1215 | } |
1216 | ||
e1910fcd | 1217 | static void sci_dma_rx_complete(void *arg) |
1da177e4 | 1218 | { |
e1910fcd | 1219 | struct sci_port *s = arg; |
1d3db608 | 1220 | struct dma_chan *chan = s->chan_rx; |
e1910fcd | 1221 | struct uart_port *port = &s->port; |
67f462b0 | 1222 | struct dma_async_tx_descriptor *desc; |
e1910fcd GU |
1223 | unsigned long flags; |
1224 | int active, count = 0; | |
1da177e4 | 1225 | |
e1910fcd GU |
1226 | dev_dbg(port->dev, "%s(%d) active cookie %d\n", __func__, port->line, |
1227 | s->active_rx); | |
cb772fe7 | 1228 | |
e1910fcd | 1229 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 1230 | |
e1910fcd GU |
1231 | active = sci_dma_rx_find_active(s); |
1232 | if (active >= 0) | |
1233 | count = sci_dma_rx_push(s, s->rx_buf[active], s->buf_len_rx); | |
f43dc23d | 1234 | |
e1910fcd | 1235 | mod_timer(&s->rx_timer, jiffies + s->rx_timeout); |
f43dc23d | 1236 | |
e1910fcd GU |
1237 | if (count) |
1238 | tty_flip_buffer_push(&port->state->port); | |
8b6ff84c | 1239 | |
67f462b0 GU |
1240 | desc = dmaengine_prep_slave_sg(s->chan_rx, &s->sg_rx[active], 1, |
1241 | DMA_DEV_TO_MEM, | |
1242 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1243 | if (!desc) | |
1244 | goto fail; | |
1245 | ||
1246 | desc->callback = sci_dma_rx_complete; | |
1247 | desc->callback_param = s; | |
1248 | s->cookie_rx[active] = dmaengine_submit(desc); | |
1249 | if (dma_submit_error(s->cookie_rx[active])) | |
1250 | goto fail; | |
1251 | ||
1252 | s->active_rx = s->cookie_rx[!active]; | |
1253 | ||
1d3db608 MHF |
1254 | dma_async_issue_pending(chan); |
1255 | ||
6fc5a520 | 1256 | spin_unlock_irqrestore(&port->lock, flags); |
67f462b0 GU |
1257 | dev_dbg(port->dev, "%s: cookie %d #%d, new active cookie %d\n", |
1258 | __func__, s->cookie_rx[active], active, s->active_rx); | |
67f462b0 GU |
1259 | return; |
1260 | ||
1261 | fail: | |
1262 | spin_unlock_irqrestore(&port->lock, flags); | |
1263 | dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n"); | |
1264 | sci_rx_dma_release(s, true); | |
1da177e4 LT |
1265 | } |
1266 | ||
e1910fcd | 1267 | static void sci_tx_dma_release(struct sci_port *s, bool enable_pio) |
1da177e4 | 1268 | { |
e1910fcd GU |
1269 | struct dma_chan *chan = s->chan_tx; |
1270 | struct uart_port *port = &s->port; | |
e552de24 | 1271 | unsigned long flags; |
1da177e4 | 1272 | |
e1910fcd GU |
1273 | spin_lock_irqsave(&port->lock, flags); |
1274 | s->chan_tx = NULL; | |
1275 | s->cookie_tx = -EINVAL; | |
1276 | spin_unlock_irqrestore(&port->lock, flags); | |
1277 | dmaengine_terminate_all(chan); | |
1278 | dma_unmap_single(chan->device->dev, s->tx_dma_addr, UART_XMIT_SIZE, | |
1279 | DMA_TO_DEVICE); | |
1280 | dma_release_channel(chan); | |
1281 | if (enable_pio) | |
1282 | sci_start_tx(port); | |
1283 | } | |
d535a230 | 1284 | |
e1910fcd GU |
1285 | static void sci_submit_rx(struct sci_port *s) |
1286 | { | |
1287 | struct dma_chan *chan = s->chan_rx; | |
1288 | int i; | |
073e84c9 | 1289 | |
e1910fcd GU |
1290 | for (i = 0; i < 2; i++) { |
1291 | struct scatterlist *sg = &s->sg_rx[i]; | |
1292 | struct dma_async_tx_descriptor *desc; | |
1da177e4 | 1293 | |
e1910fcd GU |
1294 | desc = dmaengine_prep_slave_sg(chan, |
1295 | sg, 1, DMA_DEV_TO_MEM, | |
1296 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1297 | if (!desc) | |
1298 | goto fail; | |
501b825d | 1299 | |
e1910fcd GU |
1300 | desc->callback = sci_dma_rx_complete; |
1301 | desc->callback_param = s; | |
1302 | s->cookie_rx[i] = dmaengine_submit(desc); | |
1303 | if (dma_submit_error(s->cookie_rx[i])) | |
1304 | goto fail; | |
9174fc8f | 1305 | |
e1910fcd | 1306 | } |
9174fc8f | 1307 | |
e1910fcd | 1308 | s->active_rx = s->cookie_rx[0]; |
9174fc8f | 1309 | |
e1910fcd GU |
1310 | dma_async_issue_pending(chan); |
1311 | return; | |
9174fc8f | 1312 | |
e1910fcd GU |
1313 | fail: |
1314 | if (i) | |
1315 | dmaengine_terminate_all(chan); | |
1316 | for (i = 0; i < 2; i++) | |
1317 | s->cookie_rx[i] = -EINVAL; | |
1318 | s->active_rx = -EINVAL; | |
e1910fcd GU |
1319 | sci_rx_dma_release(s, true); |
1320 | } | |
9174fc8f | 1321 | |
e1910fcd | 1322 | static void work_fn_tx(struct work_struct *work) |
1da177e4 | 1323 | { |
e1910fcd GU |
1324 | struct sci_port *s = container_of(work, struct sci_port, work_tx); |
1325 | struct dma_async_tx_descriptor *desc; | |
1326 | struct dma_chan *chan = s->chan_tx; | |
1327 | struct uart_port *port = &s->port; | |
1328 | struct circ_buf *xmit = &port->state->xmit; | |
1329 | dma_addr_t buf; | |
1da177e4 | 1330 | |
9174fc8f | 1331 | /* |
e1910fcd GU |
1332 | * DMA is idle now. |
1333 | * Port xmit buffer is already mapped, and it is one page... Just adjust | |
1334 | * offsets and lengths. Since it is a circular buffer, we have to | |
1335 | * transmit till the end, and then the rest. Take the port lock to get a | |
1336 | * consistent xmit buffer state. | |
9174fc8f | 1337 | */ |
e1910fcd GU |
1338 | spin_lock_irq(&port->lock); |
1339 | buf = s->tx_dma_addr + (xmit->tail & (UART_XMIT_SIZE - 1)); | |
1340 | s->tx_dma_len = min_t(unsigned int, | |
1341 | CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE), | |
1342 | CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE)); | |
1343 | spin_unlock_irq(&port->lock); | |
0e8963de | 1344 | |
e1910fcd GU |
1345 | desc = dmaengine_prep_slave_single(chan, buf, s->tx_dma_len, |
1346 | DMA_MEM_TO_DEV, | |
1347 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1348 | if (!desc) { | |
1349 | dev_warn(port->dev, "Failed preparing Tx DMA descriptor\n"); | |
1350 | /* switch to PIO */ | |
1351 | sci_tx_dma_release(s, true); | |
1352 | return; | |
1353 | } | |
0e8963de | 1354 | |
e1910fcd GU |
1355 | dma_sync_single_for_device(chan->device->dev, buf, s->tx_dma_len, |
1356 | DMA_TO_DEVICE); | |
1da177e4 | 1357 | |
e1910fcd GU |
1358 | spin_lock_irq(&port->lock); |
1359 | desc->callback = sci_dma_tx_complete; | |
1360 | desc->callback_param = s; | |
1361 | spin_unlock_irq(&port->lock); | |
1362 | s->cookie_tx = dmaengine_submit(desc); | |
1363 | if (dma_submit_error(s->cookie_tx)) { | |
1364 | dev_warn(port->dev, "Failed submitting Tx DMA descriptor\n"); | |
1365 | /* switch to PIO */ | |
1366 | sci_tx_dma_release(s, true); | |
1367 | return; | |
1da177e4 | 1368 | } |
1da177e4 | 1369 | |
e1910fcd GU |
1370 | dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", |
1371 | __func__, xmit->buf, xmit->tail, xmit->head, s->cookie_tx); | |
73a19e4c | 1372 | |
e1910fcd | 1373 | dma_async_issue_pending(chan); |
1da177e4 LT |
1374 | } |
1375 | ||
e1910fcd | 1376 | static void rx_timer_fn(unsigned long arg) |
1da177e4 | 1377 | { |
e1910fcd | 1378 | struct sci_port *s = (struct sci_port *)arg; |
e7327c09 | 1379 | struct dma_chan *chan = s->chan_rx; |
e1910fcd | 1380 | struct uart_port *port = &s->port; |
67f462b0 GU |
1381 | struct dma_tx_state state; |
1382 | enum dma_status status; | |
1383 | unsigned long flags; | |
1384 | unsigned int read; | |
1385 | int active, count; | |
1386 | u16 scr; | |
1387 | ||
67f462b0 | 1388 | dev_dbg(port->dev, "DMA Rx timed out\n"); |
67f462b0 | 1389 | |
6fc5a520 TA |
1390 | spin_lock_irqsave(&port->lock, flags); |
1391 | ||
67f462b0 GU |
1392 | active = sci_dma_rx_find_active(s); |
1393 | if (active < 0) { | |
1394 | spin_unlock_irqrestore(&port->lock, flags); | |
1395 | return; | |
1396 | } | |
1397 | ||
1398 | status = dmaengine_tx_status(s->chan_rx, s->active_rx, &state); | |
3b963042 | 1399 | if (status == DMA_COMPLETE) { |
6fc5a520 | 1400 | spin_unlock_irqrestore(&port->lock, flags); |
67f462b0 GU |
1401 | dev_dbg(port->dev, "Cookie %d #%d has already completed\n", |
1402 | s->active_rx, active); | |
3b963042 MHF |
1403 | |
1404 | /* Let packet complete handler take care of the packet */ | |
1405 | return; | |
1406 | } | |
67f462b0 | 1407 | |
e7327c09 MHF |
1408 | dmaengine_pause(chan); |
1409 | ||
1410 | /* | |
1411 | * sometimes DMA transfer doesn't stop even if it is stopped and | |
1412 | * data keeps on coming until transaction is complete so check | |
1413 | * for DMA_COMPLETE again | |
1414 | * Let packet complete handler take care of the packet | |
1415 | */ | |
1416 | status = dmaengine_tx_status(s->chan_rx, s->active_rx, &state); | |
1417 | if (status == DMA_COMPLETE) { | |
1418 | spin_unlock_irqrestore(&port->lock, flags); | |
1419 | dev_dbg(port->dev, "Transaction complete after DMA engine was stopped"); | |
1420 | return; | |
1421 | } | |
1422 | ||
67f462b0 GU |
1423 | /* Handle incomplete DMA receive */ |
1424 | dmaengine_terminate_all(s->chan_rx); | |
1425 | read = sg_dma_len(&s->sg_rx[active]) - state.residue; | |
67f462b0 GU |
1426 | |
1427 | if (read) { | |
1428 | count = sci_dma_rx_push(s, s->rx_buf[active], read); | |
1429 | if (count) | |
1430 | tty_flip_buffer_push(&port->state->port); | |
1431 | } | |
1432 | ||
756981be GU |
1433 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
1434 | sci_submit_rx(s); | |
371cfed3 MHF |
1435 | |
1436 | /* Direct new serial port interrupts back to CPU */ | |
1437 | scr = serial_port_in(port, SCSCR); | |
1438 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1439 | scr &= ~SCSCR_RDRQE; | |
1440 | enable_irq(s->irqs[SCIx_RXI_IRQ]); | |
1441 | } | |
1442 | serial_port_out(port, SCSCR, scr | SCSCR_RIE); | |
1443 | ||
1444 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 LT |
1445 | } |
1446 | ||
ff441129 | 1447 | static struct dma_chan *sci_request_dma_chan(struct uart_port *port, |
219fb0c1 | 1448 | enum dma_transfer_direction dir) |
ff441129 | 1449 | { |
ff441129 GU |
1450 | struct dma_chan *chan; |
1451 | struct dma_slave_config cfg; | |
1452 | int ret; | |
1453 | ||
219fb0c1 LP |
1454 | chan = dma_request_slave_channel(port->dev, |
1455 | dir == DMA_MEM_TO_DEV ? "tx" : "rx"); | |
ff441129 | 1456 | if (!chan) { |
9b7becf1 | 1457 | dev_warn(port->dev, "dma_request_slave_channel failed\n"); |
ff441129 GU |
1458 | return NULL; |
1459 | } | |
1460 | ||
1461 | memset(&cfg, 0, sizeof(cfg)); | |
1462 | cfg.direction = dir; | |
1463 | if (dir == DMA_MEM_TO_DEV) { | |
1464 | cfg.dst_addr = port->mapbase + | |
1465 | (sci_getreg(port, SCxTDR)->offset << port->regshift); | |
1466 | cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
1467 | } else { | |
1468 | cfg.src_addr = port->mapbase + | |
1469 | (sci_getreg(port, SCxRDR)->offset << port->regshift); | |
1470 | cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
1471 | } | |
1472 | ||
1473 | ret = dmaengine_slave_config(chan, &cfg); | |
1474 | if (ret) { | |
1475 | dev_warn(port->dev, "dmaengine_slave_config failed %d\n", ret); | |
1476 | dma_release_channel(chan); | |
1477 | return NULL; | |
1478 | } | |
1479 | ||
1480 | return chan; | |
1481 | } | |
1482 | ||
e1910fcd | 1483 | static void sci_request_dma(struct uart_port *port) |
73a19e4c | 1484 | { |
e1910fcd | 1485 | struct sci_port *s = to_sci_port(port); |
e1910fcd | 1486 | struct dma_chan *chan; |
73a19e4c | 1487 | |
e1910fcd | 1488 | dev_dbg(port->dev, "%s: port %d\n", __func__, port->line); |
73a19e4c | 1489 | |
219fb0c1 | 1490 | if (!port->dev->of_node) |
e1910fcd | 1491 | return; |
73a19e4c | 1492 | |
e1910fcd | 1493 | s->cookie_tx = -EINVAL; |
219fb0c1 | 1494 | chan = sci_request_dma_chan(port, DMA_MEM_TO_DEV); |
e1910fcd GU |
1495 | dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan); |
1496 | if (chan) { | |
1497 | s->chan_tx = chan; | |
1498 | /* UART circular tx buffer is an aligned page. */ | |
1499 | s->tx_dma_addr = dma_map_single(chan->device->dev, | |
1500 | port->state->xmit.buf, | |
1501 | UART_XMIT_SIZE, | |
1502 | DMA_TO_DEVICE); | |
1503 | if (dma_mapping_error(chan->device->dev, s->tx_dma_addr)) { | |
1504 | dev_warn(port->dev, "Failed mapping Tx DMA descriptor\n"); | |
1505 | dma_release_channel(chan); | |
1506 | s->chan_tx = NULL; | |
1507 | } else { | |
1508 | dev_dbg(port->dev, "%s: mapped %lu@%p to %pad\n", | |
1509 | __func__, UART_XMIT_SIZE, | |
1510 | port->state->xmit.buf, &s->tx_dma_addr); | |
49d4bcad | 1511 | } |
e1910fcd GU |
1512 | |
1513 | INIT_WORK(&s->work_tx, work_fn_tx); | |
3089f381 GL |
1514 | } |
1515 | ||
219fb0c1 | 1516 | chan = sci_request_dma_chan(port, DMA_DEV_TO_MEM); |
e1910fcd GU |
1517 | dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan); |
1518 | if (chan) { | |
1519 | unsigned int i; | |
1520 | dma_addr_t dma; | |
1521 | void *buf; | |
73a19e4c | 1522 | |
e1910fcd | 1523 | s->chan_rx = chan; |
73a19e4c | 1524 | |
e1910fcd GU |
1525 | s->buf_len_rx = 2 * max_t(size_t, 16, port->fifosize); |
1526 | buf = dma_alloc_coherent(chan->device->dev, s->buf_len_rx * 2, | |
1527 | &dma, GFP_KERNEL); | |
1528 | if (!buf) { | |
1529 | dev_warn(port->dev, | |
1530 | "Failed to allocate Rx dma buffer, using PIO\n"); | |
1531 | dma_release_channel(chan); | |
1532 | s->chan_rx = NULL; | |
e1910fcd GU |
1533 | return; |
1534 | } | |
73a19e4c | 1535 | |
e1910fcd GU |
1536 | for (i = 0; i < 2; i++) { |
1537 | struct scatterlist *sg = &s->sg_rx[i]; | |
0533502d | 1538 | |
e1910fcd GU |
1539 | sg_init_table(sg, 1); |
1540 | s->rx_buf[i] = buf; | |
1541 | sg_dma_address(sg) = dma; | |
d09959e7 | 1542 | sg_dma_len(sg) = s->buf_len_rx; |
0533502d | 1543 | |
e1910fcd GU |
1544 | buf += s->buf_len_rx; |
1545 | dma += s->buf_len_rx; | |
1546 | } | |
1547 | ||
e1910fcd GU |
1548 | setup_timer(&s->rx_timer, rx_timer_fn, (unsigned long)s); |
1549 | ||
756981be GU |
1550 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
1551 | sci_submit_rx(s); | |
e1910fcd | 1552 | } |
0533502d GU |
1553 | } |
1554 | ||
e1910fcd | 1555 | static void sci_free_dma(struct uart_port *port) |
73a19e4c | 1556 | { |
e1910fcd | 1557 | struct sci_port *s = to_sci_port(port); |
73a19e4c | 1558 | |
e1910fcd GU |
1559 | if (s->chan_tx) |
1560 | sci_tx_dma_release(s, false); | |
1561 | if (s->chan_rx) | |
1562 | sci_rx_dma_release(s, false); | |
1563 | } | |
1cf4a7ef GU |
1564 | |
1565 | static void sci_flush_buffer(struct uart_port *port) | |
1566 | { | |
1567 | /* | |
1568 | * In uart_flush_buffer(), the xmit circular buffer has just been | |
1569 | * cleared, so we have to reset tx_dma_len accordingly. | |
1570 | */ | |
1571 | to_sci_port(port)->tx_dma_len = 0; | |
1572 | } | |
1573 | #else /* !CONFIG_SERIAL_SH_SCI_DMA */ | |
e1910fcd GU |
1574 | static inline void sci_request_dma(struct uart_port *port) |
1575 | { | |
1576 | } | |
73a19e4c | 1577 | |
e1910fcd GU |
1578 | static inline void sci_free_dma(struct uart_port *port) |
1579 | { | |
1580 | } | |
1cf4a7ef GU |
1581 | |
1582 | #define sci_flush_buffer NULL | |
1583 | #endif /* !CONFIG_SERIAL_SH_SCI_DMA */ | |
73a19e4c | 1584 | |
e1910fcd GU |
1585 | static irqreturn_t sci_rx_interrupt(int irq, void *ptr) |
1586 | { | |
e1910fcd GU |
1587 | struct uart_port *port = ptr; |
1588 | struct sci_port *s = to_sci_port(port); | |
73a19e4c | 1589 | |
03940376 | 1590 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
e1910fcd GU |
1591 | if (s->chan_rx) { |
1592 | u16 scr = serial_port_in(port, SCSCR); | |
1593 | u16 ssr = serial_port_in(port, SCxSR); | |
73a19e4c | 1594 | |
e1910fcd GU |
1595 | /* Disable future Rx interrupts */ |
1596 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1597 | disable_irq_nosync(irq); | |
1598 | scr |= SCSCR_RDRQE; | |
1599 | } else { | |
1600 | scr &= ~SCSCR_RIE; | |
756981be | 1601 | sci_submit_rx(s); |
e1910fcd GU |
1602 | } |
1603 | serial_port_out(port, SCSCR, scr); | |
1604 | /* Clear current interrupt */ | |
1605 | serial_port_out(port, SCxSR, | |
1606 | ssr & ~(SCIF_DR | SCxSR_RDxF(port))); | |
1607 | dev_dbg(port->dev, "Rx IRQ %lu: setup t-out in %u jiffies\n", | |
1608 | jiffies, s->rx_timeout); | |
1609 | mod_timer(&s->rx_timer, jiffies + s->rx_timeout); | |
73a19e4c | 1610 | |
e1910fcd GU |
1611 | return IRQ_HANDLED; |
1612 | } | |
1613 | #endif | |
73a19e4c | 1614 | |
03940376 UH |
1615 | if (s->rx_trigger > 1 && s->rx_fifo_timeout > 0) { |
1616 | if (!scif_rtrg_enabled(port)) | |
1617 | scif_set_rtrg(port, s->rx_trigger); | |
1618 | ||
1619 | mod_timer(&s->rx_fifo_timer, jiffies + DIV_ROUND_UP( | |
1620 | s->rx_frame * s->rx_fifo_timeout, 1000)); | |
1621 | } | |
1622 | ||
e1910fcd GU |
1623 | /* I think sci_receive_chars has to be called irrespective |
1624 | * of whether the I_IXOFF is set, otherwise, how is the interrupt | |
1625 | * to be disabled? | |
1626 | */ | |
1627 | sci_receive_chars(ptr); | |
1628 | ||
1629 | return IRQ_HANDLED; | |
73a19e4c GL |
1630 | } |
1631 | ||
e1910fcd | 1632 | static irqreturn_t sci_tx_interrupt(int irq, void *ptr) |
73a19e4c | 1633 | { |
e1910fcd | 1634 | struct uart_port *port = ptr; |
04928b79 | 1635 | unsigned long flags; |
73a19e4c | 1636 | |
04928b79 | 1637 | spin_lock_irqsave(&port->lock, flags); |
e1910fcd | 1638 | sci_transmit_chars(port); |
04928b79 | 1639 | spin_unlock_irqrestore(&port->lock, flags); |
e1910fcd GU |
1640 | |
1641 | return IRQ_HANDLED; | |
73a19e4c GL |
1642 | } |
1643 | ||
e1910fcd | 1644 | static irqreturn_t sci_er_interrupt(int irq, void *ptr) |
73a19e4c | 1645 | { |
e1910fcd GU |
1646 | struct uart_port *port = ptr; |
1647 | struct sci_port *s = to_sci_port(port); | |
73a19e4c | 1648 | |
e1910fcd GU |
1649 | /* Handle errors */ |
1650 | if (port->type == PORT_SCI) { | |
1651 | if (sci_handle_errors(port)) { | |
1652 | /* discard character in rx buffer */ | |
1653 | serial_port_in(port, SCxSR); | |
1654 | sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port)); | |
1655 | } | |
1656 | } else { | |
1657 | sci_handle_fifo_overrun(port); | |
1658 | if (!s->chan_rx) | |
1659 | sci_receive_chars(ptr); | |
1660 | } | |
1661 | ||
1662 | sci_clear_SCxSR(port, SCxSR_ERROR_CLEAR(port)); | |
1663 | ||
1664 | /* Kick the transmission */ | |
1665 | if (!s->chan_tx) | |
1666 | sci_tx_interrupt(irq, ptr); | |
1667 | ||
1668 | return IRQ_HANDLED; | |
73a19e4c GL |
1669 | } |
1670 | ||
e1910fcd | 1671 | static irqreturn_t sci_br_interrupt(int irq, void *ptr) |
73a19e4c | 1672 | { |
e1910fcd | 1673 | struct uart_port *port = ptr; |
73a19e4c | 1674 | |
e1910fcd GU |
1675 | /* Handle BREAKs */ |
1676 | sci_handle_breaks(port); | |
1677 | sci_clear_SCxSR(port, SCxSR_BREAK_CLEAR(port)); | |
73a19e4c | 1678 | |
e1910fcd GU |
1679 | return IRQ_HANDLED; |
1680 | } | |
73a19e4c | 1681 | |
e1910fcd GU |
1682 | static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) |
1683 | { | |
1684 | unsigned short ssr_status, scr_status, err_enabled, orer_status = 0; | |
1685 | struct uart_port *port = ptr; | |
1686 | struct sci_port *s = to_sci_port(port); | |
1687 | irqreturn_t ret = IRQ_NONE; | |
73a19e4c | 1688 | |
e1910fcd GU |
1689 | ssr_status = serial_port_in(port, SCxSR); |
1690 | scr_status = serial_port_in(port, SCSCR); | |
b2f20ed9 | 1691 | if (s->params->overrun_reg == SCxSR) |
e1910fcd | 1692 | orer_status = ssr_status; |
b2f20ed9 LP |
1693 | else if (sci_getreg(port, s->params->overrun_reg)->size) |
1694 | orer_status = serial_port_in(port, s->params->overrun_reg); | |
73a19e4c | 1695 | |
e1910fcd | 1696 | err_enabled = scr_status & port_rx_irq_mask(port); |
73a19e4c | 1697 | |
e1910fcd GU |
1698 | /* Tx Interrupt */ |
1699 | if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCSCR_TIE) && | |
1700 | !s->chan_tx) | |
1701 | ret = sci_tx_interrupt(irq, ptr); | |
658daa95 | 1702 | |
e1910fcd GU |
1703 | /* |
1704 | * Rx Interrupt: if we're using DMA, the DMA controller clears RDF / | |
1705 | * DR flags | |
1706 | */ | |
1707 | if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) && | |
1708 | (scr_status & SCSCR_RIE)) | |
1709 | ret = sci_rx_interrupt(irq, ptr); | |
73a19e4c | 1710 | |
e1910fcd GU |
1711 | /* Error Interrupt */ |
1712 | if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled) | |
1713 | ret = sci_er_interrupt(irq, ptr); | |
73a19e4c | 1714 | |
e1910fcd GU |
1715 | /* Break Interrupt */ |
1716 | if ((ssr_status & SCxSR_BRK(port)) && err_enabled) | |
1717 | ret = sci_br_interrupt(irq, ptr); | |
1718 | ||
1719 | /* Overrun Interrupt */ | |
b2f20ed9 | 1720 | if (orer_status & s->params->overrun_mask) { |
e1910fcd GU |
1721 | sci_handle_fifo_overrun(port); |
1722 | ret = IRQ_HANDLED; | |
73a19e4c | 1723 | } |
73a19e4c | 1724 | |
e1910fcd GU |
1725 | return ret; |
1726 | } | |
73a19e4c | 1727 | |
e1910fcd GU |
1728 | static const struct sci_irq_desc { |
1729 | const char *desc; | |
1730 | irq_handler_t handler; | |
1731 | } sci_irq_desc[] = { | |
1732 | /* | |
1733 | * Split out handlers, the default case. | |
1734 | */ | |
1735 | [SCIx_ERI_IRQ] = { | |
1736 | .desc = "rx err", | |
1737 | .handler = sci_er_interrupt, | |
1738 | }, | |
3089f381 | 1739 | |
e1910fcd GU |
1740 | [SCIx_RXI_IRQ] = { |
1741 | .desc = "rx full", | |
1742 | .handler = sci_rx_interrupt, | |
1743 | }, | |
47aceb92 | 1744 | |
e1910fcd GU |
1745 | [SCIx_TXI_IRQ] = { |
1746 | .desc = "tx empty", | |
1747 | .handler = sci_tx_interrupt, | |
1748 | }, | |
73a19e4c | 1749 | |
e1910fcd GU |
1750 | [SCIx_BRI_IRQ] = { |
1751 | .desc = "break", | |
1752 | .handler = sci_br_interrupt, | |
1753 | }, | |
73a19e4c GL |
1754 | |
1755 | /* | |
e1910fcd | 1756 | * Special muxed handler. |
73a19e4c | 1757 | */ |
e1910fcd GU |
1758 | [SCIx_MUX_IRQ] = { |
1759 | .desc = "mux", | |
1760 | .handler = sci_mpxed_interrupt, | |
1761 | }, | |
1762 | }; | |
73a19e4c | 1763 | |
e1910fcd GU |
1764 | static int sci_request_irq(struct sci_port *port) |
1765 | { | |
1766 | struct uart_port *up = &port->port; | |
1767 | int i, j, ret = 0; | |
73a19e4c | 1768 | |
e1910fcd GU |
1769 | for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) { |
1770 | const struct sci_irq_desc *desc; | |
1771 | int irq; | |
73a19e4c | 1772 | |
e1910fcd GU |
1773 | if (SCIx_IRQ_IS_MUXED(port)) { |
1774 | i = SCIx_MUX_IRQ; | |
1775 | irq = up->irq; | |
1776 | } else { | |
1777 | irq = port->irqs[i]; | |
1778 | ||
1779 | /* | |
1780 | * Certain port types won't support all of the | |
1781 | * available interrupt sources. | |
1782 | */ | |
1783 | if (unlikely(irq < 0)) | |
1784 | continue; | |
1785 | } | |
1786 | ||
1787 | desc = sci_irq_desc + i; | |
1788 | port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s", | |
1789 | dev_name(up->dev), desc->desc); | |
623ac1d4 PB |
1790 | if (!port->irqstr[j]) { |
1791 | ret = -ENOMEM; | |
e1910fcd | 1792 | goto out_nomem; |
623ac1d4 | 1793 | } |
e1910fcd GU |
1794 | |
1795 | ret = request_irq(irq, desc->handler, up->irqflags, | |
1796 | port->irqstr[j], port); | |
1797 | if (unlikely(ret)) { | |
1798 | dev_err(up->dev, "Can't allocate %s IRQ\n", desc->desc); | |
1799 | goto out_noirq; | |
1800 | } | |
73a19e4c GL |
1801 | } |
1802 | ||
e1910fcd | 1803 | return 0; |
1da177e4 | 1804 | |
e1910fcd GU |
1805 | out_noirq: |
1806 | while (--i >= 0) | |
1807 | free_irq(port->irqs[i], port); | |
f43dc23d | 1808 | |
e1910fcd GU |
1809 | out_nomem: |
1810 | while (--j >= 0) | |
1811 | kfree(port->irqstr[j]); | |
f43dc23d | 1812 | |
e1910fcd | 1813 | return ret; |
1da177e4 LT |
1814 | } |
1815 | ||
e1910fcd | 1816 | static void sci_free_irq(struct sci_port *port) |
1da177e4 | 1817 | { |
e1910fcd | 1818 | int i; |
1da177e4 | 1819 | |
e1910fcd GU |
1820 | /* |
1821 | * Intentionally in reverse order so we iterate over the muxed | |
1822 | * IRQ first. | |
1823 | */ | |
1824 | for (i = 0; i < SCIx_NR_IRQS; i++) { | |
1825 | int irq = port->irqs[i]; | |
f43dc23d | 1826 | |
e1910fcd GU |
1827 | /* |
1828 | * Certain port types won't support all of the available | |
1829 | * interrupt sources. | |
1830 | */ | |
1831 | if (unlikely(irq < 0)) | |
1832 | continue; | |
f43dc23d | 1833 | |
e1910fcd GU |
1834 | free_irq(port->irqs[i], port); |
1835 | kfree(port->irqstr[i]); | |
f43dc23d | 1836 | |
e1910fcd GU |
1837 | if (SCIx_IRQ_IS_MUXED(port)) { |
1838 | /* If there's only one IRQ, we're done. */ | |
1839 | return; | |
1840 | } | |
1841 | } | |
1da177e4 LT |
1842 | } |
1843 | ||
e1910fcd | 1844 | static unsigned int sci_tx_empty(struct uart_port *port) |
1da177e4 | 1845 | { |
e1910fcd GU |
1846 | unsigned short status = serial_port_in(port, SCxSR); |
1847 | unsigned short in_tx_fifo = sci_txfill(port); | |
f43dc23d | 1848 | |
e1910fcd | 1849 | return (status & SCxSR_TEND(port)) && !in_tx_fifo ? TIOCSER_TEMT : 0; |
1da177e4 LT |
1850 | } |
1851 | ||
33f50ffc GU |
1852 | static void sci_set_rts(struct uart_port *port, bool state) |
1853 | { | |
1854 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1855 | u16 data = serial_port_in(port, SCPDR); | |
1856 | ||
1857 | /* Active low */ | |
1858 | if (state) | |
1859 | data &= ~SCPDR_RTSD; | |
1860 | else | |
1861 | data |= SCPDR_RTSD; | |
1862 | serial_port_out(port, SCPDR, data); | |
1863 | ||
1864 | /* RTS# is output */ | |
1865 | serial_port_out(port, SCPCR, | |
1866 | serial_port_in(port, SCPCR) | SCPCR_RTSC); | |
1867 | } else if (sci_getreg(port, SCSPTR)->size) { | |
1868 | u16 ctrl = serial_port_in(port, SCSPTR); | |
1869 | ||
1870 | /* Active low */ | |
1871 | if (state) | |
1872 | ctrl &= ~SCSPTR_RTSDT; | |
1873 | else | |
1874 | ctrl |= SCSPTR_RTSDT; | |
1875 | serial_port_out(port, SCSPTR, ctrl); | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | static bool sci_get_cts(struct uart_port *port) | |
1880 | { | |
1881 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1882 | /* Active low */ | |
1883 | return !(serial_port_in(port, SCPDR) & SCPDR_CTSD); | |
1884 | } else if (sci_getreg(port, SCSPTR)->size) { | |
1885 | /* Active low */ | |
1886 | return !(serial_port_in(port, SCSPTR) & SCSPTR_CTSDT); | |
1887 | } | |
1888 | ||
1889 | return true; | |
1890 | } | |
1891 | ||
e1910fcd GU |
1892 | /* |
1893 | * Modem control is a bit of a mixed bag for SCI(F) ports. Generally | |
1894 | * CTS/RTS is supported in hardware by at least one port and controlled | |
1895 | * via SCSPTR (SCxPCR for SCIFA/B parts), or external pins (presently | |
1896 | * handled via the ->init_pins() op, which is a bit of a one-way street, | |
1897 | * lacking any ability to defer pin control -- this will later be | |
1898 | * converted over to the GPIO framework). | |
1899 | * | |
1900 | * Other modes (such as loopback) are supported generically on certain | |
1901 | * port types, but not others. For these it's sufficient to test for the | |
1902 | * existence of the support register and simply ignore the port type. | |
1903 | */ | |
1904 | static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
1da177e4 | 1905 | { |
f907c9ea GU |
1906 | struct sci_port *s = to_sci_port(port); |
1907 | ||
e1910fcd GU |
1908 | if (mctrl & TIOCM_LOOP) { |
1909 | const struct plat_sci_reg *reg; | |
f43dc23d | 1910 | |
e1910fcd GU |
1911 | /* |
1912 | * Standard loopback mode for SCFCR ports. | |
1913 | */ | |
1914 | reg = sci_getreg(port, SCFCR); | |
1915 | if (reg->size) | |
1916 | serial_port_out(port, SCFCR, | |
1917 | serial_port_in(port, SCFCR) | | |
1918 | SCFCR_LOOP); | |
1919 | } | |
f907c9ea GU |
1920 | |
1921 | mctrl_gpio_set(s->gpios, mctrl); | |
33f50ffc | 1922 | |
97ed9790 | 1923 | if (!s->has_rtscts) |
33f50ffc GU |
1924 | return; |
1925 | ||
1926 | if (!(mctrl & TIOCM_RTS)) { | |
1927 | /* Disable Auto RTS */ | |
1928 | serial_port_out(port, SCFCR, | |
1929 | serial_port_in(port, SCFCR) & ~SCFCR_MCE); | |
1930 | ||
1931 | /* Clear RTS */ | |
1932 | sci_set_rts(port, 0); | |
1933 | } else if (s->autorts) { | |
1934 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1935 | /* Enable RTS# pin function */ | |
1936 | serial_port_out(port, SCPCR, | |
1937 | serial_port_in(port, SCPCR) & ~SCPCR_RTSC); | |
1938 | } | |
1939 | ||
1940 | /* Enable Auto RTS */ | |
1941 | serial_port_out(port, SCFCR, | |
1942 | serial_port_in(port, SCFCR) | SCFCR_MCE); | |
1943 | } else { | |
1944 | /* Set RTS */ | |
1945 | sci_set_rts(port, 1); | |
1946 | } | |
e1910fcd | 1947 | } |
f43dc23d | 1948 | |
e1910fcd GU |
1949 | static unsigned int sci_get_mctrl(struct uart_port *port) |
1950 | { | |
f907c9ea GU |
1951 | struct sci_port *s = to_sci_port(port); |
1952 | struct mctrl_gpios *gpios = s->gpios; | |
1953 | unsigned int mctrl = 0; | |
1954 | ||
1955 | mctrl_gpio_get(gpios, &mctrl); | |
1956 | ||
e1910fcd GU |
1957 | /* |
1958 | * CTS/RTS is handled in hardware when supported, while nothing | |
33f50ffc | 1959 | * else is wired up. |
e1910fcd | 1960 | */ |
33f50ffc GU |
1961 | if (s->autorts) { |
1962 | if (sci_get_cts(port)) | |
1963 | mctrl |= TIOCM_CTS; | |
1964 | } else if (IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(gpios, UART_GPIO_CTS))) { | |
f907c9ea | 1965 | mctrl |= TIOCM_CTS; |
33f50ffc | 1966 | } |
f907c9ea GU |
1967 | if (IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(gpios, UART_GPIO_DSR))) |
1968 | mctrl |= TIOCM_DSR; | |
1969 | if (IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(gpios, UART_GPIO_DCD))) | |
1970 | mctrl |= TIOCM_CAR; | |
1971 | ||
1972 | return mctrl; | |
1973 | } | |
1974 | ||
1975 | static void sci_enable_ms(struct uart_port *port) | |
1976 | { | |
1977 | mctrl_gpio_enable_ms(to_sci_port(port)->gpios); | |
1da177e4 LT |
1978 | } |
1979 | ||
1da177e4 LT |
1980 | static void sci_break_ctl(struct uart_port *port, int break_state) |
1981 | { | |
bbb4ce50 SY |
1982 | unsigned short scscr, scsptr; |
1983 | ||
a4e02f6d | 1984 | /* check wheter the port has SCSPTR */ |
abbf121f | 1985 | if (!sci_getreg(port, SCSPTR)->size) { |
bbb4ce50 SY |
1986 | /* |
1987 | * Not supported by hardware. Most parts couple break and rx | |
1988 | * interrupts together, with break detection always enabled. | |
1989 | */ | |
a4e02f6d | 1990 | return; |
bbb4ce50 | 1991 | } |
a4e02f6d SY |
1992 | |
1993 | scsptr = serial_port_in(port, SCSPTR); | |
1994 | scscr = serial_port_in(port, SCSCR); | |
1995 | ||
1996 | if (break_state == -1) { | |
1997 | scsptr = (scsptr | SCSPTR_SPB2IO) & ~SCSPTR_SPB2DT; | |
1998 | scscr &= ~SCSCR_TE; | |
1999 | } else { | |
2000 | scsptr = (scsptr | SCSPTR_SPB2DT) & ~SCSPTR_SPB2IO; | |
2001 | scscr |= SCSCR_TE; | |
2002 | } | |
2003 | ||
2004 | serial_port_out(port, SCSPTR, scsptr); | |
2005 | serial_port_out(port, SCSCR, scscr); | |
1da177e4 LT |
2006 | } |
2007 | ||
2008 | static int sci_startup(struct uart_port *port) | |
2009 | { | |
a5660ada | 2010 | struct sci_port *s = to_sci_port(port); |
073e84c9 | 2011 | int ret; |
1da177e4 | 2012 | |
73a19e4c GL |
2013 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
2014 | ||
3c910176 TA |
2015 | sci_request_dma(port); |
2016 | ||
073e84c9 | 2017 | ret = sci_request_irq(s); |
3c910176 TA |
2018 | if (unlikely(ret < 0)) { |
2019 | sci_free_dma(port); | |
073e84c9 | 2020 | return ret; |
3c910176 | 2021 | } |
073e84c9 | 2022 | |
1da177e4 LT |
2023 | return 0; |
2024 | } | |
2025 | ||
2026 | static void sci_shutdown(struct uart_port *port) | |
2027 | { | |
a5660ada | 2028 | struct sci_port *s = to_sci_port(port); |
33b48e16 | 2029 | unsigned long flags; |
5fd2b6ee | 2030 | u16 scr; |
1da177e4 | 2031 | |
73a19e4c GL |
2032 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
2033 | ||
33f50ffc | 2034 | s->autorts = false; |
f907c9ea GU |
2035 | mctrl_gpio_disable_ms(to_sci_port(port)->gpios); |
2036 | ||
33b48e16 | 2037 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 2038 | sci_stop_rx(port); |
b129a8cc | 2039 | sci_stop_tx(port); |
5fd2b6ee GU |
2040 | /* Stop RX and TX, disable related interrupts, keep clock source */ |
2041 | scr = serial_port_in(port, SCSCR); | |
2042 | serial_port_out(port, SCSCR, scr & (SCSCR_CKE1 | SCSCR_CKE0)); | |
33b48e16 | 2043 | spin_unlock_irqrestore(&port->lock, flags); |
073e84c9 | 2044 | |
9ab76556 AM |
2045 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
2046 | if (s->chan_rx) { | |
2047 | dev_dbg(port->dev, "%s(%d) deleting rx_timer\n", __func__, | |
2048 | port->line); | |
2049 | del_timer_sync(&s->rx_timer); | |
2050 | } | |
2051 | #endif | |
2052 | ||
1da177e4 | 2053 | sci_free_irq(s); |
3c910176 | 2054 | sci_free_dma(port); |
1da177e4 LT |
2055 | } |
2056 | ||
6af27bf2 GU |
2057 | static int sci_sck_calc(struct sci_port *s, unsigned int bps, |
2058 | unsigned int *srr) | |
26c92f37 | 2059 | { |
6af27bf2 | 2060 | unsigned long freq = s->clk_rates[SCI_SCK]; |
6af27bf2 | 2061 | int err, min_err = INT_MAX; |
69eee8e9 | 2062 | unsigned int sr; |
6af27bf2 | 2063 | |
7b5c0c08 GU |
2064 | if (s->port.type != PORT_HSCIF) |
2065 | freq *= 2; | |
6af27bf2 | 2066 | |
69eee8e9 | 2067 | for_each_sr(sr, s) { |
6af27bf2 GU |
2068 | err = DIV_ROUND_CLOSEST(freq, sr) - bps; |
2069 | if (abs(err) >= abs(min_err)) | |
2070 | continue; | |
2071 | ||
2072 | min_err = err; | |
2073 | *srr = sr - 1; | |
ec09c5eb | 2074 | |
6af27bf2 GU |
2075 | if (!err) |
2076 | break; | |
2077 | } | |
e8183a6c | 2078 | |
6af27bf2 GU |
2079 | dev_dbg(s->port.dev, "SCK: %u%+d bps using SR %u\n", bps, min_err, |
2080 | *srr + 1); | |
2081 | return min_err; | |
26c92f37 PM |
2082 | } |
2083 | ||
1270f865 GU |
2084 | static int sci_brg_calc(struct sci_port *s, unsigned int bps, |
2085 | unsigned long freq, unsigned int *dlr, | |
2086 | unsigned int *srr) | |
730c4e78 | 2087 | { |
1270f865 | 2088 | int err, min_err = INT_MAX; |
69eee8e9 | 2089 | unsigned int sr, dl; |
730c4e78 | 2090 | |
7b5c0c08 GU |
2091 | if (s->port.type != PORT_HSCIF) |
2092 | freq *= 2; | |
730c4e78 | 2093 | |
69eee8e9 | 2094 | for_each_sr(sr, s) { |
1270f865 GU |
2095 | dl = DIV_ROUND_CLOSEST(freq, sr * bps); |
2096 | dl = clamp(dl, 1U, 65535U); | |
2097 | ||
2098 | err = DIV_ROUND_CLOSEST(freq, sr * dl) - bps; | |
2099 | if (abs(err) >= abs(min_err)) | |
2100 | continue; | |
2101 | ||
2102 | min_err = err; | |
2103 | *dlr = dl; | |
2104 | *srr = sr - 1; | |
2105 | ||
2106 | if (!err) | |
2107 | break; | |
2108 | } | |
730c4e78 | 2109 | |
1270f865 GU |
2110 | dev_dbg(s->port.dev, "BRG: %u%+d bps using DL %u SR %u\n", bps, |
2111 | min_err, *dlr, *srr + 1); | |
2112 | return min_err; | |
2113 | } | |
730c4e78 | 2114 | |
b4a5c459 | 2115 | /* calculate sample rate, BRR, and clock select */ |
f4998e55 GU |
2116 | static int sci_scbrr_calc(struct sci_port *s, unsigned int bps, |
2117 | unsigned int *brr, unsigned int *srr, | |
2118 | unsigned int *cks) | |
f303b364 | 2119 | { |
f4998e55 | 2120 | unsigned long freq = s->clk_rates[SCI_FCK]; |
69eee8e9 | 2121 | unsigned int sr, br, prediv, scrate, c; |
6c51332d | 2122 | int err, min_err = INT_MAX; |
f303b364 | 2123 | |
7b5c0c08 GU |
2124 | if (s->port.type != PORT_HSCIF) |
2125 | freq *= 2; | |
b4a5c459 | 2126 | |
6c51332d GU |
2127 | /* |
2128 | * Find the combination of sample rate and clock select with the | |
2129 | * smallest deviation from the desired baud rate. | |
2130 | * Prefer high sample rates to maximise the receive margin. | |
2131 | * | |
2132 | * M: Receive margin (%) | |
2133 | * N: Ratio of bit rate to clock (N = sampling rate) | |
2134 | * D: Clock duty (D = 0 to 1.0) | |
2135 | * L: Frame length (L = 9 to 12) | |
2136 | * F: Absolute value of clock frequency deviation | |
2137 | * | |
2138 | * M = |(0.5 - 1 / 2 * N) - ((L - 0.5) * F) - | |
2139 | * (|D - 0.5| / N * (1 + F))| | |
2140 | * NOTE: Usually, treat D for 0.5, F is 0 by this calculation. | |
2141 | */ | |
69eee8e9 | 2142 | for_each_sr(sr, s) { |
f303b364 UH |
2143 | for (c = 0; c <= 3; c++) { |
2144 | /* integerized formulas from HSCIF documentation */ | |
7b5c0c08 | 2145 | prediv = sr * (1 << (2 * c + 1)); |
de01e6cd GU |
2146 | |
2147 | /* | |
2148 | * We need to calculate: | |
2149 | * | |
2150 | * br = freq / (prediv * bps) clamped to [1..256] | |
881a7489 | 2151 | * err = freq / (br * prediv) - bps |
730c4e78 | 2152 | * |
de01e6cd GU |
2153 | * Watch out for overflow when calculating the desired |
2154 | * sampling clock rate! | |
730c4e78 | 2155 | */ |
de01e6cd GU |
2156 | if (bps > UINT_MAX / prediv) |
2157 | break; | |
2158 | ||
2159 | scrate = prediv * bps; | |
2160 | br = DIV_ROUND_CLOSEST(freq, scrate); | |
95a2703e | 2161 | br = clamp(br, 1U, 256U); |
6c51332d | 2162 | |
881a7489 | 2163 | err = DIV_ROUND_CLOSEST(freq, br * prediv) - bps; |
6c51332d | 2164 | if (abs(err) >= abs(min_err)) |
730c4e78 NI |
2165 | continue; |
2166 | ||
6c51332d | 2167 | min_err = err; |
95a2703e | 2168 | *brr = br - 1; |
730c4e78 NI |
2169 | *srr = sr - 1; |
2170 | *cks = c; | |
6c51332d GU |
2171 | |
2172 | if (!err) | |
2173 | goto found; | |
f303b364 UH |
2174 | } |
2175 | } | |
2176 | ||
6c51332d | 2177 | found: |
881a7489 GU |
2178 | dev_dbg(s->port.dev, "BRR: %u%+d bps using N %u SR %u cks %u\n", bps, |
2179 | min_err, *brr, *srr + 1, *cks); | |
f4998e55 | 2180 | return min_err; |
f303b364 UH |
2181 | } |
2182 | ||
1ba76220 MD |
2183 | static void sci_reset(struct uart_port *port) |
2184 | { | |
d3184e68 | 2185 | const struct plat_sci_reg *reg; |
1ba76220 | 2186 | unsigned int status; |
18e8cf15 | 2187 | struct sci_port *s = to_sci_port(port); |
1ba76220 | 2188 | |
b12bb29f | 2189 | serial_port_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ |
1ba76220 | 2190 | |
0979e0e6 PM |
2191 | reg = sci_getreg(port, SCFCR); |
2192 | if (reg->size) | |
b12bb29f | 2193 | serial_port_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); |
2768cf42 GU |
2194 | |
2195 | sci_clear_SCxSR(port, | |
2196 | SCxSR_RDxF_CLEAR(port) & SCxSR_ERROR_CLEAR(port) & | |
2197 | SCxSR_BREAK_CLEAR(port)); | |
fc2af334 GU |
2198 | if (sci_getreg(port, SCLSR)->size) { |
2199 | status = serial_port_in(port, SCLSR); | |
2200 | status &= ~(SCLSR_TO | SCLSR_ORER); | |
2201 | serial_port_out(port, SCLSR, status); | |
2202 | } | |
18e8cf15 | 2203 | |
03940376 UH |
2204 | if (s->rx_trigger > 1) { |
2205 | if (s->rx_fifo_timeout) { | |
2206 | scif_set_rtrg(port, 1); | |
2207 | setup_timer(&s->rx_fifo_timer, rx_fifo_timer_fn, | |
2208 | (unsigned long)s); | |
2209 | } else { | |
90afa525 UH |
2210 | if (port->type == PORT_SCIFA || |
2211 | port->type == PORT_SCIFB) | |
2212 | scif_set_rtrg(port, 1); | |
2213 | else | |
2214 | scif_set_rtrg(port, s->rx_trigger); | |
03940376 UH |
2215 | } |
2216 | } | |
1ba76220 MD |
2217 | } |
2218 | ||
606d099c AC |
2219 | static void sci_set_termios(struct uart_port *port, struct ktermios *termios, |
2220 | struct ktermios *old) | |
1da177e4 | 2221 | { |
03940376 | 2222 | unsigned int baud, smr_val = SCSMR_ASYNC, scr_val = 0, i, bits; |
1270f865 GU |
2223 | unsigned int brr = 255, cks = 0, srr = 15, dl = 0, sccks = 0; |
2224 | unsigned int brr1 = 255, cks1 = 0, srr1 = 15, dl1 = 0; | |
00b9de9c | 2225 | struct sci_port *s = to_sci_port(port); |
d3184e68 | 2226 | const struct plat_sci_reg *reg; |
f4998e55 GU |
2227 | int min_err = INT_MAX, err; |
2228 | unsigned long max_freq = 0; | |
2229 | int best_clk = -1; | |
1da177e4 | 2230 | |
730c4e78 NI |
2231 | if ((termios->c_cflag & CSIZE) == CS7) |
2232 | smr_val |= SCSMR_CHR; | |
2233 | if (termios->c_cflag & PARENB) | |
2234 | smr_val |= SCSMR_PE; | |
2235 | if (termios->c_cflag & PARODD) | |
2236 | smr_val |= SCSMR_PE | SCSMR_ODD; | |
2237 | if (termios->c_cflag & CSTOPB) | |
2238 | smr_val |= SCSMR_STOP; | |
2239 | ||
154280fd MD |
2240 | /* |
2241 | * earlyprintk comes here early on with port->uartclk set to zero. | |
2242 | * the clock framework is not up and running at this point so here | |
2243 | * we assume that 115200 is the maximum baud rate. please note that | |
2244 | * the baud rate is not programmed during earlyprintk - it is assumed | |
2245 | * that the previous boot loader has enabled required clocks and | |
2246 | * setup the baud rate generator hardware for us already. | |
2247 | */ | |
f4998e55 GU |
2248 | if (!port->uartclk) { |
2249 | baud = uart_get_baud_rate(port, termios, old, 0, 115200); | |
2250 | goto done; | |
2251 | } | |
1da177e4 | 2252 | |
f4998e55 GU |
2253 | for (i = 0; i < SCI_NUM_CLKS; i++) |
2254 | max_freq = max(max_freq, s->clk_rates[i]); | |
2255 | ||
69eee8e9 | 2256 | baud = uart_get_baud_rate(port, termios, old, 0, max_freq / min_sr(s)); |
f4998e55 GU |
2257 | if (!baud) |
2258 | goto done; | |
2259 | ||
2260 | /* | |
2261 | * There can be multiple sources for the sampling clock. Find the one | |
2262 | * that gives us the smallest deviation from the desired baud rate. | |
2263 | */ | |
2264 | ||
6af27bf2 GU |
2265 | /* Optional Undivided External Clock */ |
2266 | if (s->clk_rates[SCI_SCK] && port->type != PORT_SCIFA && | |
2267 | port->type != PORT_SCIFB) { | |
2268 | err = sci_sck_calc(s, baud, &srr1); | |
2269 | if (abs(err) < abs(min_err)) { | |
2270 | best_clk = SCI_SCK; | |
2271 | scr_val = SCSCR_CKE1; | |
2272 | sccks = SCCKS_CKS; | |
2273 | min_err = err; | |
2274 | srr = srr1; | |
2275 | if (!err) | |
2276 | goto done; | |
2277 | } | |
2278 | } | |
2279 | ||
1270f865 GU |
2280 | /* Optional BRG Frequency Divided External Clock */ |
2281 | if (s->clk_rates[SCI_SCIF_CLK] && sci_getreg(port, SCDL)->size) { | |
2282 | err = sci_brg_calc(s, baud, s->clk_rates[SCI_SCIF_CLK], &dl1, | |
2283 | &srr1); | |
2284 | if (abs(err) < abs(min_err)) { | |
2285 | best_clk = SCI_SCIF_CLK; | |
2286 | scr_val = SCSCR_CKE1; | |
2287 | sccks = 0; | |
2288 | min_err = err; | |
2289 | dl = dl1; | |
2290 | srr = srr1; | |
2291 | if (!err) | |
2292 | goto done; | |
2293 | } | |
2294 | } | |
2295 | ||
2296 | /* Optional BRG Frequency Divided Internal Clock */ | |
2297 | if (s->clk_rates[SCI_BRG_INT] && sci_getreg(port, SCDL)->size) { | |
2298 | err = sci_brg_calc(s, baud, s->clk_rates[SCI_BRG_INT], &dl1, | |
2299 | &srr1); | |
2300 | if (abs(err) < abs(min_err)) { | |
2301 | best_clk = SCI_BRG_INT; | |
2302 | scr_val = SCSCR_CKE1; | |
2303 | sccks = SCCKS_XIN; | |
2304 | min_err = err; | |
2305 | dl = dl1; | |
2306 | srr = srr1; | |
2307 | if (!min_err) | |
2308 | goto done; | |
f303b364 UH |
2309 | } |
2310 | } | |
e108b2ca | 2311 | |
f4998e55 GU |
2312 | /* Divided Functional Clock using standard Bit Rate Register */ |
2313 | err = sci_scbrr_calc(s, baud, &brr1, &srr1, &cks1); | |
2314 | if (abs(err) < abs(min_err)) { | |
2315 | best_clk = SCI_FCK; | |
6af27bf2 | 2316 | scr_val = 0; |
f4998e55 GU |
2317 | min_err = err; |
2318 | brr = brr1; | |
2319 | srr = srr1; | |
2320 | cks = cks1; | |
2321 | } | |
2322 | ||
2323 | done: | |
2324 | if (best_clk >= 0) | |
2325 | dev_dbg(port->dev, "Using clk %pC for %u%+d bps\n", | |
2326 | s->clks[best_clk], baud, min_err); | |
e108b2ca | 2327 | |
23241d43 | 2328 | sci_port_enable(s); |
36003386 | 2329 | |
6af27bf2 GU |
2330 | /* |
2331 | * Program the optional External Baud Rate Generator (BRG) first. | |
2332 | * It controls the mux to select (H)SCK or frequency divided clock. | |
2333 | */ | |
1270f865 GU |
2334 | if (best_clk >= 0 && sci_getreg(port, SCCKS)->size) { |
2335 | serial_port_out(port, SCDL, dl); | |
6af27bf2 | 2336 | serial_port_out(port, SCCKS, sccks); |
1270f865 | 2337 | } |
1da177e4 | 2338 | |
1ba76220 | 2339 | sci_reset(port); |
1da177e4 LT |
2340 | |
2341 | uart_update_timeout(port, termios->c_cflag, baud); | |
2342 | ||
f4998e55 | 2343 | if (best_clk >= 0) { |
92a05748 GU |
2344 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
2345 | switch (srr + 1) { | |
2346 | case 5: smr_val |= SCSMR_SRC_5; break; | |
2347 | case 7: smr_val |= SCSMR_SRC_7; break; | |
2348 | case 11: smr_val |= SCSMR_SRC_11; break; | |
2349 | case 13: smr_val |= SCSMR_SRC_13; break; | |
2350 | case 16: smr_val |= SCSMR_SRC_16; break; | |
2351 | case 17: smr_val |= SCSMR_SRC_17; break; | |
2352 | case 19: smr_val |= SCSMR_SRC_19; break; | |
2353 | case 27: smr_val |= SCSMR_SRC_27; break; | |
2354 | } | |
f4998e55 | 2355 | smr_val |= cks; |
6af27bf2 | 2356 | dev_dbg(port->dev, |
1270f865 GU |
2357 | "SCR 0x%x SMR 0x%x BRR %u CKS 0x%x DL %u SRR %u\n", |
2358 | scr_val, smr_val, brr, sccks, dl, srr); | |
6af27bf2 | 2359 | serial_port_out(port, SCSCR, scr_val); |
f4998e55 GU |
2360 | serial_port_out(port, SCSMR, smr_val); |
2361 | serial_port_out(port, SCBRR, brr); | |
2362 | if (sci_getreg(port, HSSRR)->size) | |
f303b364 | 2363 | serial_port_out(port, HSSRR, srr | HSCIF_SRE); |
f4998e55 GU |
2364 | |
2365 | /* Wait one bit interval */ | |
2366 | udelay((1000000 + (baud - 1)) / baud); | |
2367 | } else { | |
2368 | /* Don't touch the bit rate configuration */ | |
2369 | scr_val = s->cfg->scscr & (SCSCR_CKE1 | SCSCR_CKE0); | |
3a964abe GU |
2370 | smr_val |= serial_port_in(port, SCSMR) & |
2371 | (SCSMR_CKEDG | SCSMR_SRC_MASK | SCSMR_CKS); | |
f4998e55 GU |
2372 | dev_dbg(port->dev, "SCR 0x%x SMR 0x%x\n", scr_val, smr_val); |
2373 | serial_port_out(port, SCSCR, scr_val); | |
9d482cc3 | 2374 | serial_port_out(port, SCSMR, smr_val); |
f4998e55 | 2375 | } |
1da177e4 | 2376 | |
d5701647 | 2377 | sci_init_pins(port, termios->c_cflag); |
0979e0e6 | 2378 | |
33f50ffc GU |
2379 | port->status &= ~UPSTAT_AUTOCTS; |
2380 | s->autorts = false; | |
73c3d53f PM |
2381 | reg = sci_getreg(port, SCFCR); |
2382 | if (reg->size) { | |
b12bb29f | 2383 | unsigned short ctrl = serial_port_in(port, SCFCR); |
0979e0e6 | 2384 | |
33f50ffc GU |
2385 | if ((port->flags & UPF_HARD_FLOW) && |
2386 | (termios->c_cflag & CRTSCTS)) { | |
2387 | /* There is no CTS interrupt to restart the hardware */ | |
2388 | port->status |= UPSTAT_AUTOCTS; | |
2389 | /* MCE is enabled when RTS is raised */ | |
2390 | s->autorts = true; | |
faf02f8f | 2391 | } |
73c3d53f PM |
2392 | |
2393 | /* | |
2394 | * As we've done a sci_reset() above, ensure we don't | |
2395 | * interfere with the FIFOs while toggling MCE. As the | |
2396 | * reset values could still be set, simply mask them out. | |
2397 | */ | |
2398 | ctrl &= ~(SCFCR_RFRST | SCFCR_TFRST); | |
2399 | ||
b12bb29f | 2400 | serial_port_out(port, SCFCR, ctrl); |
0979e0e6 | 2401 | } |
5f76895e GU |
2402 | if (port->flags & UPF_HARD_FLOW) { |
2403 | /* Refresh (Auto) RTS */ | |
2404 | sci_set_mctrl(port, port->mctrl); | |
2405 | } | |
b7a76e4b | 2406 | |
9f8325b3 LP |
2407 | scr_val |= SCSCR_RE | SCSCR_TE | |
2408 | (s->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0)); | |
f4998e55 GU |
2409 | dev_dbg(port->dev, "SCSCR 0x%x\n", scr_val); |
2410 | serial_port_out(port, SCSCR, scr_val); | |
92a05748 GU |
2411 | if ((srr + 1 == 5) && |
2412 | (port->type == PORT_SCIFA || port->type == PORT_SCIFB)) { | |
2413 | /* | |
2414 | * In asynchronous mode, when the sampling rate is 1/5, first | |
2415 | * received data may become invalid on some SCIFA and SCIFB. | |
2416 | * To avoid this problem wait more than 1 serial data time (1 | |
2417 | * bit time x serial data number) after setting SCSCR.RE = 1. | |
2418 | */ | |
2419 | udelay(DIV_ROUND_UP(10 * 1000000, baud)); | |
2420 | } | |
1da177e4 | 2421 | |
3089f381 | 2422 | /* |
5f6d8515 | 2423 | * Calculate delay for 2 DMA buffers (4 FIFO). |
f5835c1d GU |
2424 | * See serial_core.c::uart_update_timeout(). |
2425 | * With 10 bits (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above | |
2426 | * function calculates 1 jiffie for the data plus 5 jiffies for the | |
2427 | * "slop(e)." Then below we calculate 5 jiffies (20ms) for 2 DMA | |
2428 | * buffers (4 FIFO sizes), but when performing a faster transfer, the | |
2429 | * value obtained by this formula is too small. Therefore, if the value | |
2430 | * is smaller than 20ms, use 20ms as the timeout value for DMA. | |
3089f381 | 2431 | */ |
03940376 UH |
2432 | /* byte size and parity */ |
2433 | switch (termios->c_cflag & CSIZE) { | |
2434 | case CS5: | |
2435 | bits = 7; | |
2436 | break; | |
2437 | case CS6: | |
2438 | bits = 8; | |
2439 | break; | |
2440 | case CS7: | |
2441 | bits = 9; | |
2442 | break; | |
2443 | default: | |
2444 | bits = 10; | |
2445 | break; | |
2446 | } | |
5f6d8515 | 2447 | |
03940376 UH |
2448 | if (termios->c_cflag & CSTOPB) |
2449 | bits++; | |
2450 | if (termios->c_cflag & PARENB) | |
2451 | bits++; | |
5f6d8515 | 2452 | |
03940376 UH |
2453 | s->rx_frame = (100 * bits * HZ) / (baud / 10); |
2454 | #ifdef CONFIG_SERIAL_SH_SCI_DMA | |
2455 | s->rx_timeout = DIV_ROUND_UP(s->buf_len_rx * 2 * s->rx_frame, 1000); | |
2456 | dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n", | |
2457 | s->rx_timeout * 1000 / HZ, port->timeout); | |
2458 | if (s->rx_timeout < msecs_to_jiffies(20)) | |
2459 | s->rx_timeout = msecs_to_jiffies(20); | |
3089f381 GL |
2460 | #endif |
2461 | ||
1da177e4 | 2462 | if ((termios->c_cflag & CREAD) != 0) |
73a19e4c | 2463 | sci_start_rx(port); |
36003386 | 2464 | |
23241d43 | 2465 | sci_port_disable(s); |
f907c9ea GU |
2466 | |
2467 | if (UART_ENABLE_MS(port, termios->c_cflag)) | |
2468 | sci_enable_ms(port); | |
1da177e4 LT |
2469 | } |
2470 | ||
0174e5ca TK |
2471 | static void sci_pm(struct uart_port *port, unsigned int state, |
2472 | unsigned int oldstate) | |
2473 | { | |
2474 | struct sci_port *sci_port = to_sci_port(port); | |
2475 | ||
2476 | switch (state) { | |
d3dfe5d9 | 2477 | case UART_PM_STATE_OFF: |
0174e5ca TK |
2478 | sci_port_disable(sci_port); |
2479 | break; | |
2480 | default: | |
2481 | sci_port_enable(sci_port); | |
2482 | break; | |
2483 | } | |
2484 | } | |
2485 | ||
1da177e4 LT |
2486 | static const char *sci_type(struct uart_port *port) |
2487 | { | |
2488 | switch (port->type) { | |
e7c98dc7 MT |
2489 | case PORT_IRDA: |
2490 | return "irda"; | |
2491 | case PORT_SCI: | |
2492 | return "sci"; | |
2493 | case PORT_SCIF: | |
2494 | return "scif"; | |
2495 | case PORT_SCIFA: | |
2496 | return "scifa"; | |
d1d4b10c GL |
2497 | case PORT_SCIFB: |
2498 | return "scifb"; | |
f303b364 UH |
2499 | case PORT_HSCIF: |
2500 | return "hscif"; | |
1da177e4 LT |
2501 | } |
2502 | ||
fa43972f | 2503 | return NULL; |
1da177e4 LT |
2504 | } |
2505 | ||
f6e9495d PM |
2506 | static int sci_remap_port(struct uart_port *port) |
2507 | { | |
e4d6f911 | 2508 | struct sci_port *sport = to_sci_port(port); |
f6e9495d PM |
2509 | |
2510 | /* | |
2511 | * Nothing to do if there's already an established membase. | |
2512 | */ | |
2513 | if (port->membase) | |
2514 | return 0; | |
2515 | ||
3d73f32b | 2516 | if (port->dev->of_node || (port->flags & UPF_IOREMAP)) { |
e4d6f911 | 2517 | port->membase = ioremap_nocache(port->mapbase, sport->reg_size); |
f6e9495d PM |
2518 | if (unlikely(!port->membase)) { |
2519 | dev_err(port->dev, "can't remap port#%d\n", port->line); | |
2520 | return -ENXIO; | |
2521 | } | |
2522 | } else { | |
2523 | /* | |
2524 | * For the simple (and majority of) cases where we don't | |
2525 | * need to do any remapping, just cast the cookie | |
2526 | * directly. | |
2527 | */ | |
3af4e960 | 2528 | port->membase = (void __iomem *)(uintptr_t)port->mapbase; |
f6e9495d PM |
2529 | } |
2530 | ||
2531 | return 0; | |
2532 | } | |
2533 | ||
e2651647 | 2534 | static void sci_release_port(struct uart_port *port) |
1da177e4 | 2535 | { |
e4d6f911 YS |
2536 | struct sci_port *sport = to_sci_port(port); |
2537 | ||
3d73f32b | 2538 | if (port->dev->of_node || (port->flags & UPF_IOREMAP)) { |
e2651647 PM |
2539 | iounmap(port->membase); |
2540 | port->membase = NULL; | |
2541 | } | |
2542 | ||
e4d6f911 | 2543 | release_mem_region(port->mapbase, sport->reg_size); |
1da177e4 LT |
2544 | } |
2545 | ||
e2651647 | 2546 | static int sci_request_port(struct uart_port *port) |
1da177e4 | 2547 | { |
e2651647 | 2548 | struct resource *res; |
e4d6f911 | 2549 | struct sci_port *sport = to_sci_port(port); |
f6e9495d | 2550 | int ret; |
1da177e4 | 2551 | |
e4d6f911 YS |
2552 | res = request_mem_region(port->mapbase, sport->reg_size, |
2553 | dev_name(port->dev)); | |
2554 | if (unlikely(res == NULL)) { | |
2555 | dev_err(port->dev, "request_mem_region failed."); | |
e2651647 | 2556 | return -EBUSY; |
e4d6f911 | 2557 | } |
1da177e4 | 2558 | |
f6e9495d PM |
2559 | ret = sci_remap_port(port); |
2560 | if (unlikely(ret != 0)) { | |
2561 | release_resource(res); | |
2562 | return ret; | |
7ff731ae | 2563 | } |
e2651647 PM |
2564 | |
2565 | return 0; | |
2566 | } | |
2567 | ||
2568 | static void sci_config_port(struct uart_port *port, int flags) | |
2569 | { | |
2570 | if (flags & UART_CONFIG_TYPE) { | |
2571 | struct sci_port *sport = to_sci_port(port); | |
2572 | ||
2573 | port->type = sport->cfg->type; | |
2574 | sci_request_port(port); | |
2575 | } | |
1da177e4 LT |
2576 | } |
2577 | ||
2578 | static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) | |
2579 | { | |
1da177e4 LT |
2580 | if (ser->baud_base < 2400) |
2581 | /* No paper tape reader for Mitch.. */ | |
2582 | return -EINVAL; | |
2583 | ||
2584 | return 0; | |
2585 | } | |
2586 | ||
069a47e5 | 2587 | static const struct uart_ops sci_uart_ops = { |
1da177e4 LT |
2588 | .tx_empty = sci_tx_empty, |
2589 | .set_mctrl = sci_set_mctrl, | |
2590 | .get_mctrl = sci_get_mctrl, | |
2591 | .start_tx = sci_start_tx, | |
2592 | .stop_tx = sci_stop_tx, | |
2593 | .stop_rx = sci_stop_rx, | |
f907c9ea | 2594 | .enable_ms = sci_enable_ms, |
1da177e4 LT |
2595 | .break_ctl = sci_break_ctl, |
2596 | .startup = sci_startup, | |
2597 | .shutdown = sci_shutdown, | |
1cf4a7ef | 2598 | .flush_buffer = sci_flush_buffer, |
1da177e4 | 2599 | .set_termios = sci_set_termios, |
0174e5ca | 2600 | .pm = sci_pm, |
1da177e4 LT |
2601 | .type = sci_type, |
2602 | .release_port = sci_release_port, | |
2603 | .request_port = sci_request_port, | |
2604 | .config_port = sci_config_port, | |
2605 | .verify_port = sci_verify_port, | |
07d2a1a1 PM |
2606 | #ifdef CONFIG_CONSOLE_POLL |
2607 | .poll_get_char = sci_poll_get_char, | |
2608 | .poll_put_char = sci_poll_put_char, | |
2609 | #endif | |
1da177e4 LT |
2610 | }; |
2611 | ||
a9ec81f4 LP |
2612 | static int sci_init_clocks(struct sci_port *sci_port, struct device *dev) |
2613 | { | |
f4998e55 GU |
2614 | const char *clk_names[] = { |
2615 | [SCI_FCK] = "fck", | |
6af27bf2 | 2616 | [SCI_SCK] = "sck", |
1270f865 GU |
2617 | [SCI_BRG_INT] = "brg_int", |
2618 | [SCI_SCIF_CLK] = "scif_clk", | |
f4998e55 GU |
2619 | }; |
2620 | struct clk *clk; | |
2621 | unsigned int i; | |
a9ec81f4 | 2622 | |
6af27bf2 GU |
2623 | if (sci_port->cfg->type == PORT_HSCIF) |
2624 | clk_names[SCI_SCK] = "hsck"; | |
2625 | ||
f4998e55 GU |
2626 | for (i = 0; i < SCI_NUM_CLKS; i++) { |
2627 | clk = devm_clk_get(dev, clk_names[i]); | |
2628 | if (PTR_ERR(clk) == -EPROBE_DEFER) | |
2629 | return -EPROBE_DEFER; | |
a9ec81f4 | 2630 | |
f4998e55 GU |
2631 | if (IS_ERR(clk) && i == SCI_FCK) { |
2632 | /* | |
2633 | * "fck" used to be called "sci_ick", and we need to | |
2634 | * maintain DT backward compatibility. | |
2635 | */ | |
2636 | clk = devm_clk_get(dev, "sci_ick"); | |
2637 | if (PTR_ERR(clk) == -EPROBE_DEFER) | |
2638 | return -EPROBE_DEFER; | |
a9ec81f4 | 2639 | |
f4998e55 GU |
2640 | if (!IS_ERR(clk)) |
2641 | goto found; | |
a9ec81f4 | 2642 | |
f4998e55 GU |
2643 | /* |
2644 | * Not all SH platforms declare a clock lookup entry | |
2645 | * for SCI devices, in which case we need to get the | |
2646 | * global "peripheral_clk" clock. | |
2647 | */ | |
2648 | clk = devm_clk_get(dev, "peripheral_clk"); | |
2649 | if (!IS_ERR(clk)) | |
2650 | goto found; | |
2651 | ||
2652 | dev_err(dev, "failed to get %s (%ld)\n", clk_names[i], | |
2653 | PTR_ERR(clk)); | |
2654 | return PTR_ERR(clk); | |
2655 | } | |
2656 | ||
2657 | found: | |
2658 | if (IS_ERR(clk)) | |
2659 | dev_dbg(dev, "failed to get %s (%ld)\n", clk_names[i], | |
2660 | PTR_ERR(clk)); | |
2661 | else | |
2662 | dev_dbg(dev, "clk %s is %pC rate %pCr\n", clk_names[i], | |
2663 | clk, clk); | |
2664 | sci_port->clks[i] = IS_ERR(clk) ? NULL : clk; | |
2665 | } | |
2666 | return 0; | |
a9ec81f4 LP |
2667 | } |
2668 | ||
daf5a895 LP |
2669 | static const struct sci_port_params * |
2670 | sci_probe_regmap(const struct plat_sci_port *cfg) | |
2671 | { | |
2672 | unsigned int regtype; | |
2673 | ||
2674 | if (cfg->regtype != SCIx_PROBE_REGTYPE) | |
2675 | return &sci_port_params[cfg->regtype]; | |
2676 | ||
2677 | switch (cfg->type) { | |
2678 | case PORT_SCI: | |
2679 | regtype = SCIx_SCI_REGTYPE; | |
2680 | break; | |
2681 | case PORT_IRDA: | |
2682 | regtype = SCIx_IRDA_REGTYPE; | |
2683 | break; | |
2684 | case PORT_SCIFA: | |
2685 | regtype = SCIx_SCIFA_REGTYPE; | |
2686 | break; | |
2687 | case PORT_SCIFB: | |
2688 | regtype = SCIx_SCIFB_REGTYPE; | |
2689 | break; | |
2690 | case PORT_SCIF: | |
2691 | /* | |
2692 | * The SH-4 is a bit of a misnomer here, although that's | |
2693 | * where this particular port layout originated. This | |
2694 | * configuration (or some slight variation thereof) | |
2695 | * remains the dominant model for all SCIFs. | |
2696 | */ | |
2697 | regtype = SCIx_SH4_SCIF_REGTYPE; | |
2698 | break; | |
2699 | case PORT_HSCIF: | |
2700 | regtype = SCIx_HSCIF_REGTYPE; | |
2701 | break; | |
2702 | default: | |
2703 | pr_err("Can't probe register map for given port\n"); | |
2704 | return NULL; | |
2705 | } | |
2706 | ||
2707 | return &sci_port_params[regtype]; | |
2708 | } | |
2709 | ||
9671f099 | 2710 | static int sci_init_single(struct platform_device *dev, |
1fcc91a6 | 2711 | struct sci_port *sci_port, unsigned int index, |
daf5a895 | 2712 | const struct plat_sci_port *p, bool early) |
e108b2ca | 2713 | { |
73a19e4c | 2714 | struct uart_port *port = &sci_port->port; |
1fcc91a6 LP |
2715 | const struct resource *res; |
2716 | unsigned int i; | |
3127c6b2 | 2717 | int ret; |
e108b2ca | 2718 | |
50f0959a PM |
2719 | sci_port->cfg = p; |
2720 | ||
73a19e4c GL |
2721 | port->ops = &sci_uart_ops; |
2722 | port->iotype = UPIO_MEM; | |
2723 | port->line = index; | |
75136d48 | 2724 | |
89b5c1ab LP |
2725 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
2726 | if (res == NULL) | |
2727 | return -ENOMEM; | |
1fcc91a6 | 2728 | |
89b5c1ab | 2729 | port->mapbase = res->start; |
e4d6f911 | 2730 | sci_port->reg_size = resource_size(res); |
1fcc91a6 | 2731 | |
89b5c1ab LP |
2732 | for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) |
2733 | sci_port->irqs[i] = platform_get_irq(dev, i); | |
1fcc91a6 | 2734 | |
89b5c1ab LP |
2735 | /* The SCI generates several interrupts. They can be muxed together or |
2736 | * connected to different interrupt lines. In the muxed case only one | |
2737 | * interrupt resource is specified. In the non-muxed case three or four | |
2738 | * interrupt resources are specified, as the BRI interrupt is optional. | |
2739 | */ | |
2740 | if (sci_port->irqs[0] < 0) | |
2741 | return -ENXIO; | |
1fcc91a6 | 2742 | |
89b5c1ab LP |
2743 | if (sci_port->irqs[1] < 0) { |
2744 | sci_port->irqs[1] = sci_port->irqs[0]; | |
2745 | sci_port->irqs[2] = sci_port->irqs[0]; | |
2746 | sci_port->irqs[3] = sci_port->irqs[0]; | |
1fcc91a6 LP |
2747 | } |
2748 | ||
daf5a895 LP |
2749 | sci_port->params = sci_probe_regmap(p); |
2750 | if (unlikely(sci_port->params == NULL)) | |
2751 | return -EINVAL; | |
e095ee6b | 2752 | |
18e8cf15 UH |
2753 | switch (p->type) { |
2754 | case PORT_SCIFB: | |
2755 | sci_port->rx_trigger = 48; | |
2756 | break; | |
2757 | case PORT_HSCIF: | |
2758 | sci_port->rx_trigger = 64; | |
2759 | break; | |
2760 | case PORT_SCIFA: | |
2761 | sci_port->rx_trigger = 32; | |
2762 | break; | |
2763 | case PORT_SCIF: | |
2764 | if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) | |
2765 | /* RX triggering not implemented for this IP */ | |
2766 | sci_port->rx_trigger = 1; | |
2767 | else | |
2768 | sci_port->rx_trigger = 8; | |
2769 | break; | |
2770 | default: | |
2771 | sci_port->rx_trigger = 1; | |
2772 | break; | |
2773 | } | |
2774 | ||
03940376 UH |
2775 | sci_port->rx_fifo_timeout = 0; |
2776 | ||
878fbb91 LP |
2777 | /* SCIFA on sh7723 and sh7724 need a custom sampling rate that doesn't |
2778 | * match the SoC datasheet, this should be investigated. Let platform | |
2779 | * data override the sampling rate for now. | |
ec09c5eb | 2780 | */ |
b2f20ed9 LP |
2781 | sci_port->sampling_rate_mask = p->sampling_rate |
2782 | ? SCI_SR(p->sampling_rate) | |
2783 | : sci_port->params->sampling_rate_mask; | |
ec09c5eb | 2784 | |
1fcc91a6 | 2785 | if (!early) { |
a9ec81f4 LP |
2786 | ret = sci_init_clocks(sci_port, &dev->dev); |
2787 | if (ret < 0) | |
2788 | return ret; | |
c7ed1ab3 | 2789 | |
73a19e4c | 2790 | port->dev = &dev->dev; |
5e50d2d6 MD |
2791 | |
2792 | pm_runtime_enable(&dev->dev); | |
7b6fd3bf | 2793 | } |
e108b2ca | 2794 | |
ce6738b6 | 2795 | port->type = p->type; |
3d73f32b | 2796 | port->flags = UPF_FIXED_PORT | UPF_BOOT_AUTOCONF | p->flags; |
b2f20ed9 | 2797 | port->fifosize = sci_port->params->fifosize; |
73a19e4c | 2798 | |
dfc80387 LP |
2799 | if (port->type == PORT_SCI) { |
2800 | if (sci_port->reg_size >= 0x20) | |
2801 | port->regshift = 2; | |
2802 | else | |
2803 | port->regshift = 1; | |
2804 | } | |
2805 | ||
ce6738b6 | 2806 | /* |
61a6976b | 2807 | * The UART port needs an IRQ value, so we peg this to the RX IRQ |
ce6738b6 PM |
2808 | * for the multi-IRQ ports, which is where we are primarily |
2809 | * concerned with the shutdown path synchronization. | |
2810 | * | |
2811 | * For the muxed case there's nothing more to do. | |
2812 | */ | |
1fcc91a6 | 2813 | port->irq = sci_port->irqs[SCIx_RXI_IRQ]; |
9cfb5c05 | 2814 | port->irqflags = 0; |
73a19e4c | 2815 | |
61a6976b PM |
2816 | port->serial_in = sci_serial_in; |
2817 | port->serial_out = sci_serial_out; | |
2818 | ||
c7ed1ab3 | 2819 | return 0; |
e108b2ca PM |
2820 | } |
2821 | ||
6dae1421 LP |
2822 | static void sci_cleanup_single(struct sci_port *port) |
2823 | { | |
6dae1421 LP |
2824 | pm_runtime_disable(port->port.dev); |
2825 | } | |
2826 | ||
0b0cced1 YS |
2827 | #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || \ |
2828 | defined(CONFIG_SERIAL_SH_SCI_EARLYCON) | |
dc8e6f5b MD |
2829 | static void serial_console_putchar(struct uart_port *port, int ch) |
2830 | { | |
2831 | sci_poll_put_char(port, ch); | |
2832 | } | |
2833 | ||
1da177e4 LT |
2834 | /* |
2835 | * Print a string to the serial port trying not to disturb | |
2836 | * any possible real use of the port... | |
2837 | */ | |
2838 | static void serial_console_write(struct console *co, const char *s, | |
2839 | unsigned count) | |
2840 | { | |
906b17dc PM |
2841 | struct sci_port *sci_port = &sci_ports[co->index]; |
2842 | struct uart_port *port = &sci_port->port; | |
a67969b5 | 2843 | unsigned short bits, ctrl, ctrl_temp; |
40f70c03 SK |
2844 | unsigned long flags; |
2845 | int locked = 1; | |
2846 | ||
2847 | local_irq_save(flags); | |
0b0cced1 | 2848 | #if defined(SUPPORT_SYSRQ) |
40f70c03 SK |
2849 | if (port->sysrq) |
2850 | locked = 0; | |
0b0cced1 YS |
2851 | else |
2852 | #endif | |
2853 | if (oops_in_progress) | |
40f70c03 SK |
2854 | locked = spin_trylock(&port->lock); |
2855 | else | |
2856 | spin_lock(&port->lock); | |
2857 | ||
a67969b5 | 2858 | /* first save SCSCR then disable interrupts, keep clock source */ |
40f70c03 | 2859 | ctrl = serial_port_in(port, SCSCR); |
9f8325b3 LP |
2860 | ctrl_temp = SCSCR_RE | SCSCR_TE | |
2861 | (sci_port->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0)) | | |
a67969b5 GU |
2862 | (ctrl & (SCSCR_CKE1 | SCSCR_CKE0)); |
2863 | serial_port_out(port, SCSCR, ctrl_temp); | |
07d2a1a1 | 2864 | |
501b825d | 2865 | uart_console_write(port, s, count, serial_console_putchar); |
973e5d52 MD |
2866 | |
2867 | /* wait until fifo is empty and last bit has been transmitted */ | |
2868 | bits = SCxSR_TDxE(port) | SCxSR_TEND(port); | |
b12bb29f | 2869 | while ((serial_port_in(port, SCxSR) & bits) != bits) |
973e5d52 | 2870 | cpu_relax(); |
40f70c03 SK |
2871 | |
2872 | /* restore the SCSCR */ | |
2873 | serial_port_out(port, SCSCR, ctrl); | |
2874 | ||
2875 | if (locked) | |
2876 | spin_unlock(&port->lock); | |
2877 | local_irq_restore(flags); | |
1da177e4 LT |
2878 | } |
2879 | ||
9671f099 | 2880 | static int serial_console_setup(struct console *co, char *options) |
1da177e4 | 2881 | { |
dc8e6f5b | 2882 | struct sci_port *sci_port; |
1da177e4 LT |
2883 | struct uart_port *port; |
2884 | int baud = 115200; | |
2885 | int bits = 8; | |
2886 | int parity = 'n'; | |
2887 | int flow = 'n'; | |
2888 | int ret; | |
2889 | ||
e108b2ca | 2890 | /* |
906b17dc | 2891 | * Refuse to handle any bogus ports. |
1da177e4 | 2892 | */ |
906b17dc | 2893 | if (co->index < 0 || co->index >= SCI_NPORTS) |
e108b2ca | 2894 | return -ENODEV; |
e108b2ca | 2895 | |
906b17dc PM |
2896 | sci_port = &sci_ports[co->index]; |
2897 | port = &sci_port->port; | |
2898 | ||
b2267a6b AC |
2899 | /* |
2900 | * Refuse to handle uninitialized ports. | |
2901 | */ | |
2902 | if (!port->ops) | |
2903 | return -ENODEV; | |
2904 | ||
f6e9495d PM |
2905 | ret = sci_remap_port(port); |
2906 | if (unlikely(ret != 0)) | |
2907 | return ret; | |
e108b2ca | 2908 | |
1da177e4 LT |
2909 | if (options) |
2910 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2911 | ||
ab7cfb55 | 2912 | return uart_set_options(port, co, baud, parity, bits, flow); |
1da177e4 LT |
2913 | } |
2914 | ||
2915 | static struct console serial_console = { | |
2916 | .name = "ttySC", | |
906b17dc | 2917 | .device = uart_console_device, |
1da177e4 LT |
2918 | .write = serial_console_write, |
2919 | .setup = serial_console_setup, | |
fa5da2f7 | 2920 | .flags = CON_PRINTBUFFER, |
1da177e4 | 2921 | .index = -1, |
906b17dc | 2922 | .data = &sci_uart_driver, |
1da177e4 LT |
2923 | }; |
2924 | ||
7b6fd3bf MD |
2925 | static struct console early_serial_console = { |
2926 | .name = "early_ttySC", | |
2927 | .write = serial_console_write, | |
2928 | .flags = CON_PRINTBUFFER, | |
906b17dc | 2929 | .index = -1, |
7b6fd3bf | 2930 | }; |
ecdf8a46 | 2931 | |
7b6fd3bf MD |
2932 | static char early_serial_buf[32]; |
2933 | ||
9671f099 | 2934 | static int sci_probe_earlyprintk(struct platform_device *pdev) |
ecdf8a46 | 2935 | { |
daf5a895 | 2936 | const struct plat_sci_port *cfg = dev_get_platdata(&pdev->dev); |
ecdf8a46 PM |
2937 | |
2938 | if (early_serial_console.data) | |
2939 | return -EEXIST; | |
2940 | ||
2941 | early_serial_console.index = pdev->id; | |
ecdf8a46 | 2942 | |
1fcc91a6 | 2943 | sci_init_single(pdev, &sci_ports[pdev->id], pdev->id, cfg, true); |
ecdf8a46 PM |
2944 | |
2945 | serial_console_setup(&early_serial_console, early_serial_buf); | |
2946 | ||
2947 | if (!strstr(early_serial_buf, "keep")) | |
2948 | early_serial_console.flags |= CON_BOOT; | |
2949 | ||
2950 | register_console(&early_serial_console); | |
2951 | return 0; | |
2952 | } | |
6a8c9799 NI |
2953 | |
2954 | #define SCI_CONSOLE (&serial_console) | |
2955 | ||
ecdf8a46 | 2956 | #else |
9671f099 | 2957 | static inline int sci_probe_earlyprintk(struct platform_device *pdev) |
ecdf8a46 PM |
2958 | { |
2959 | return -EINVAL; | |
2960 | } | |
1da177e4 | 2961 | |
6a8c9799 NI |
2962 | #define SCI_CONSOLE NULL |
2963 | ||
0b0cced1 | 2964 | #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE || CONFIG_SERIAL_SH_SCI_EARLYCON */ |
1da177e4 | 2965 | |
6c13d5d2 | 2966 | static const char banner[] __initconst = "SuperH (H)SCI(F) driver initialized"; |
1da177e4 | 2967 | |
352b9266 | 2968 | static DEFINE_MUTEX(sci_uart_registration_lock); |
1da177e4 LT |
2969 | static struct uart_driver sci_uart_driver = { |
2970 | .owner = THIS_MODULE, | |
2971 | .driver_name = "sci", | |
1da177e4 LT |
2972 | .dev_name = "ttySC", |
2973 | .major = SCI_MAJOR, | |
2974 | .minor = SCI_MINOR_START, | |
e108b2ca | 2975 | .nr = SCI_NPORTS, |
1da177e4 LT |
2976 | .cons = SCI_CONSOLE, |
2977 | }; | |
2978 | ||
54507f6e | 2979 | static int sci_remove(struct platform_device *dev) |
e552de24 | 2980 | { |
d535a230 | 2981 | struct sci_port *port = platform_get_drvdata(dev); |
e552de24 | 2982 | |
d535a230 PM |
2983 | uart_remove_one_port(&sci_uart_driver, &port->port); |
2984 | ||
6dae1421 | 2985 | sci_cleanup_single(port); |
e552de24 | 2986 | |
5d23188a UH |
2987 | if (port->port.fifosize > 1) { |
2988 | sysfs_remove_file(&dev->dev.kobj, | |
2989 | &dev_attr_rx_fifo_trigger.attr); | |
2990 | } | |
2991 | if (port->port.type == PORT_SCIFA || port->port.type == PORT_SCIFB) { | |
2992 | sysfs_remove_file(&dev->dev.kobj, | |
2993 | &dev_attr_rx_fifo_timeout.attr); | |
2994 | } | |
2995 | ||
e552de24 MD |
2996 | return 0; |
2997 | } | |
2998 | ||
bd2238fb GU |
2999 | |
3000 | #define SCI_OF_DATA(type, regtype) (void *)((type) << 16 | (regtype)) | |
3001 | #define SCI_OF_TYPE(data) ((unsigned long)(data) >> 16) | |
3002 | #define SCI_OF_REGTYPE(data) ((unsigned long)(data) & 0xffff) | |
20bdcab8 BH |
3003 | |
3004 | static const struct of_device_id of_sci_match[] = { | |
f443ff80 GU |
3005 | /* SoC-specific types */ |
3006 | { | |
3007 | .compatible = "renesas,scif-r7s72100", | |
3008 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH2_SCIF_FIFODATA_REGTYPE), | |
3009 | }, | |
9ed44bb2 GU |
3010 | /* Family-specific types */ |
3011 | { | |
3012 | .compatible = "renesas,rcar-gen1-scif", | |
3013 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH4_SCIF_BRG_REGTYPE), | |
3014 | }, { | |
3015 | .compatible = "renesas,rcar-gen2-scif", | |
3016 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH4_SCIF_BRG_REGTYPE), | |
3017 | }, { | |
3018 | .compatible = "renesas,rcar-gen3-scif", | |
3019 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH4_SCIF_BRG_REGTYPE), | |
3020 | }, | |
f443ff80 | 3021 | /* Generic types */ |
20bdcab8 BH |
3022 | { |
3023 | .compatible = "renesas,scif", | |
bd2238fb | 3024 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH4_SCIF_REGTYPE), |
20bdcab8 BH |
3025 | }, { |
3026 | .compatible = "renesas,scifa", | |
bd2238fb | 3027 | .data = SCI_OF_DATA(PORT_SCIFA, SCIx_SCIFA_REGTYPE), |
20bdcab8 BH |
3028 | }, { |
3029 | .compatible = "renesas,scifb", | |
bd2238fb | 3030 | .data = SCI_OF_DATA(PORT_SCIFB, SCIx_SCIFB_REGTYPE), |
20bdcab8 BH |
3031 | }, { |
3032 | .compatible = "renesas,hscif", | |
bd2238fb | 3033 | .data = SCI_OF_DATA(PORT_HSCIF, SCIx_HSCIF_REGTYPE), |
e1d0be61 YS |
3034 | }, { |
3035 | .compatible = "renesas,sci", | |
bd2238fb | 3036 | .data = SCI_OF_DATA(PORT_SCI, SCIx_SCI_REGTYPE), |
20bdcab8 BH |
3037 | }, { |
3038 | /* Terminator */ | |
3039 | }, | |
3040 | }; | |
3041 | MODULE_DEVICE_TABLE(of, of_sci_match); | |
3042 | ||
54b12c48 GU |
3043 | static struct plat_sci_port *sci_parse_dt(struct platform_device *pdev, |
3044 | unsigned int *dev_id) | |
20bdcab8 BH |
3045 | { |
3046 | struct device_node *np = pdev->dev.of_node; | |
3047 | const struct of_device_id *match; | |
20bdcab8 | 3048 | struct plat_sci_port *p; |
97ed9790 | 3049 | struct sci_port *sp; |
20bdcab8 BH |
3050 | int id; |
3051 | ||
3052 | if (!IS_ENABLED(CONFIG_OF) || !np) | |
3053 | return NULL; | |
3054 | ||
495bb47c | 3055 | match = of_match_node(of_sci_match, np); |
20bdcab8 BH |
3056 | if (!match) |
3057 | return NULL; | |
3058 | ||
20bdcab8 | 3059 | p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL); |
4205463c | 3060 | if (!p) |
20bdcab8 | 3061 | return NULL; |
20bdcab8 | 3062 | |
2095fc76 | 3063 | /* Get the line number from the aliases node. */ |
20bdcab8 BH |
3064 | id = of_alias_get_id(np, "serial"); |
3065 | if (id < 0) { | |
3066 | dev_err(&pdev->dev, "failed to get alias id (%d)\n", id); | |
3067 | return NULL; | |
3068 | } | |
3069 | ||
97ed9790 | 3070 | sp = &sci_ports[id]; |
20bdcab8 BH |
3071 | *dev_id = id; |
3072 | ||
bd2238fb GU |
3073 | p->type = SCI_OF_TYPE(match->data); |
3074 | p->regtype = SCI_OF_REGTYPE(match->data); | |
20bdcab8 | 3075 | |
861a70ab | 3076 | if (of_find_property(np, "uart-has-rtscts", NULL)) |
97ed9790 | 3077 | sp->has_rtscts = true; |
861a70ab | 3078 | |
20bdcab8 BH |
3079 | return p; |
3080 | } | |
3081 | ||
9671f099 | 3082 | static int sci_probe_single(struct platform_device *dev, |
0ee70712 MD |
3083 | unsigned int index, |
3084 | struct plat_sci_port *p, | |
3085 | struct sci_port *sciport) | |
3086 | { | |
0ee70712 MD |
3087 | int ret; |
3088 | ||
3089 | /* Sanity check */ | |
3090 | if (unlikely(index >= SCI_NPORTS)) { | |
9b971cd2 | 3091 | dev_notice(&dev->dev, "Attempting to register port %d when only %d are available\n", |
0ee70712 | 3092 | index+1, SCI_NPORTS); |
9b971cd2 | 3093 | dev_notice(&dev->dev, "Consider bumping CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); |
b6c5ef6f | 3094 | return -EINVAL; |
0ee70712 MD |
3095 | } |
3096 | ||
352b9266 SS |
3097 | mutex_lock(&sci_uart_registration_lock); |
3098 | if (!sci_uart_driver.state) { | |
3099 | ret = uart_register_driver(&sci_uart_driver); | |
3100 | if (ret) { | |
3101 | mutex_unlock(&sci_uart_registration_lock); | |
3102 | return ret; | |
3103 | } | |
3104 | } | |
3105 | mutex_unlock(&sci_uart_registration_lock); | |
3106 | ||
1fcc91a6 | 3107 | ret = sci_init_single(dev, sciport, index, p, false); |
c7ed1ab3 PM |
3108 | if (ret) |
3109 | return ret; | |
0ee70712 | 3110 | |
f907c9ea GU |
3111 | sciport->gpios = mctrl_gpio_init(&sciport->port, 0); |
3112 | if (IS_ERR(sciport->gpios) && PTR_ERR(sciport->gpios) != -ENOSYS) | |
3113 | return PTR_ERR(sciport->gpios); | |
3114 | ||
97ed9790 | 3115 | if (sciport->has_rtscts) { |
f907c9ea GU |
3116 | if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(sciport->gpios, |
3117 | UART_GPIO_CTS)) || | |
3118 | !IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(sciport->gpios, | |
3119 | UART_GPIO_RTS))) { | |
3120 | dev_err(&dev->dev, "Conflicting RTS/CTS config\n"); | |
3121 | return -EINVAL; | |
3122 | } | |
33f50ffc | 3123 | sciport->port.flags |= UPF_HARD_FLOW; |
f907c9ea GU |
3124 | } |
3125 | ||
6dae1421 LP |
3126 | ret = uart_add_one_port(&sci_uart_driver, &sciport->port); |
3127 | if (ret) { | |
3128 | sci_cleanup_single(sciport); | |
3129 | return ret; | |
3130 | } | |
3131 | ||
3132 | return 0; | |
0ee70712 MD |
3133 | } |
3134 | ||
9671f099 | 3135 | static int sci_probe(struct platform_device *dev) |
1da177e4 | 3136 | { |
20bdcab8 BH |
3137 | struct plat_sci_port *p; |
3138 | struct sci_port *sp; | |
3139 | unsigned int dev_id; | |
ecdf8a46 | 3140 | int ret; |
d535a230 | 3141 | |
ecdf8a46 PM |
3142 | /* |
3143 | * If we've come here via earlyprintk initialization, head off to | |
3144 | * the special early probe. We don't have sufficient device state | |
3145 | * to make it beyond this yet. | |
3146 | */ | |
3147 | if (is_early_platform_device(dev)) | |
3148 | return sci_probe_earlyprintk(dev); | |
7b6fd3bf | 3149 | |
20bdcab8 BH |
3150 | if (dev->dev.of_node) { |
3151 | p = sci_parse_dt(dev, &dev_id); | |
3152 | if (p == NULL) | |
3153 | return -EINVAL; | |
3154 | } else { | |
3155 | p = dev->dev.platform_data; | |
3156 | if (p == NULL) { | |
3157 | dev_err(&dev->dev, "no platform data supplied\n"); | |
3158 | return -EINVAL; | |
3159 | } | |
3160 | ||
3161 | dev_id = dev->id; | |
3162 | } | |
3163 | ||
3164 | sp = &sci_ports[dev_id]; | |
d535a230 | 3165 | platform_set_drvdata(dev, sp); |
e552de24 | 3166 | |
20bdcab8 | 3167 | ret = sci_probe_single(dev, dev_id, p, sp); |
d535a230 | 3168 | if (ret) |
6dae1421 | 3169 | return ret; |
e552de24 | 3170 | |
5d23188a UH |
3171 | if (sp->port.fifosize > 1) { |
3172 | ret = sysfs_create_file(&dev->dev.kobj, | |
3173 | &dev_attr_rx_fifo_trigger.attr); | |
3174 | if (ret) | |
3175 | return ret; | |
3176 | } | |
3177 | if (sp->port.type == PORT_SCIFA || sp->port.type == PORT_SCIFB) { | |
3178 | ret = sysfs_create_file(&dev->dev.kobj, | |
3179 | &dev_attr_rx_fifo_timeout.attr); | |
3180 | if (ret) { | |
3181 | if (sp->port.fifosize > 1) { | |
3182 | sysfs_remove_file(&dev->dev.kobj, | |
3183 | &dev_attr_rx_fifo_trigger.attr); | |
3184 | } | |
3185 | return ret; | |
3186 | } | |
3187 | } | |
3188 | ||
1da177e4 LT |
3189 | #ifdef CONFIG_SH_STANDARD_BIOS |
3190 | sh_bios_gdb_detach(); | |
3191 | #endif | |
3192 | ||
e108b2ca | 3193 | return 0; |
1da177e4 LT |
3194 | } |
3195 | ||
cb876341 | 3196 | static __maybe_unused int sci_suspend(struct device *dev) |
1da177e4 | 3197 | { |
d535a230 | 3198 | struct sci_port *sport = dev_get_drvdata(dev); |
e108b2ca | 3199 | |
d535a230 PM |
3200 | if (sport) |
3201 | uart_suspend_port(&sci_uart_driver, &sport->port); | |
1da177e4 | 3202 | |
e108b2ca PM |
3203 | return 0; |
3204 | } | |
1da177e4 | 3205 | |
cb876341 | 3206 | static __maybe_unused int sci_resume(struct device *dev) |
e108b2ca | 3207 | { |
d535a230 | 3208 | struct sci_port *sport = dev_get_drvdata(dev); |
e108b2ca | 3209 | |
d535a230 PM |
3210 | if (sport) |
3211 | uart_resume_port(&sci_uart_driver, &sport->port); | |
e108b2ca PM |
3212 | |
3213 | return 0; | |
3214 | } | |
3215 | ||
cb876341 | 3216 | static SIMPLE_DEV_PM_OPS(sci_dev_pm_ops, sci_suspend, sci_resume); |
6daa79b3 | 3217 | |
e108b2ca PM |
3218 | static struct platform_driver sci_driver = { |
3219 | .probe = sci_probe, | |
b9e39c89 | 3220 | .remove = sci_remove, |
e108b2ca PM |
3221 | .driver = { |
3222 | .name = "sh-sci", | |
6daa79b3 | 3223 | .pm = &sci_dev_pm_ops, |
20bdcab8 | 3224 | .of_match_table = of_match_ptr(of_sci_match), |
e108b2ca PM |
3225 | }, |
3226 | }; | |
3227 | ||
3228 | static int __init sci_init(void) | |
3229 | { | |
6c13d5d2 | 3230 | pr_info("%s\n", banner); |
e108b2ca | 3231 | |
352b9266 | 3232 | return platform_driver_register(&sci_driver); |
e108b2ca PM |
3233 | } |
3234 | ||
3235 | static void __exit sci_exit(void) | |
3236 | { | |
3237 | platform_driver_unregister(&sci_driver); | |
352b9266 SS |
3238 | |
3239 | if (sci_uart_driver.state) | |
3240 | uart_unregister_driver(&sci_uart_driver); | |
1da177e4 LT |
3241 | } |
3242 | ||
7b6fd3bf MD |
3243 | #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
3244 | early_platform_init_buffer("earlyprintk", &sci_driver, | |
3245 | early_serial_buf, ARRAY_SIZE(early_serial_buf)); | |
3246 | #endif | |
0b0cced1 YS |
3247 | #ifdef CONFIG_SERIAL_SH_SCI_EARLYCON |
3248 | static struct __init plat_sci_port port_cfg; | |
3249 | ||
3250 | static int __init early_console_setup(struct earlycon_device *device, | |
3251 | int type) | |
3252 | { | |
3253 | if (!device->port.membase) | |
3254 | return -ENODEV; | |
3255 | ||
3256 | device->port.serial_in = sci_serial_in; | |
3257 | device->port.serial_out = sci_serial_out; | |
3258 | device->port.type = type; | |
3259 | memcpy(&sci_ports[0].port, &device->port, sizeof(struct uart_port)); | |
daf5a895 | 3260 | port_cfg.type = type; |
0b0cced1 | 3261 | sci_ports[0].cfg = &port_cfg; |
daf5a895 | 3262 | sci_ports[0].params = sci_probe_regmap(&port_cfg); |
9f8325b3 LP |
3263 | port_cfg.scscr = sci_serial_in(&sci_ports[0].port, SCSCR); |
3264 | sci_serial_out(&sci_ports[0].port, SCSCR, | |
3265 | SCSCR_RE | SCSCR_TE | port_cfg.scscr); | |
0b0cced1 YS |
3266 | |
3267 | device->con->write = serial_console_write; | |
3268 | return 0; | |
3269 | } | |
3270 | static int __init sci_early_console_setup(struct earlycon_device *device, | |
3271 | const char *opt) | |
3272 | { | |
3273 | return early_console_setup(device, PORT_SCI); | |
3274 | } | |
3275 | static int __init scif_early_console_setup(struct earlycon_device *device, | |
3276 | const char *opt) | |
3277 | { | |
3278 | return early_console_setup(device, PORT_SCIF); | |
3279 | } | |
3280 | static int __init scifa_early_console_setup(struct earlycon_device *device, | |
3281 | const char *opt) | |
3282 | { | |
3283 | return early_console_setup(device, PORT_SCIFA); | |
3284 | } | |
3285 | static int __init scifb_early_console_setup(struct earlycon_device *device, | |
3286 | const char *opt) | |
3287 | { | |
3288 | return early_console_setup(device, PORT_SCIFB); | |
3289 | } | |
3290 | static int __init hscif_early_console_setup(struct earlycon_device *device, | |
3291 | const char *opt) | |
3292 | { | |
3293 | return early_console_setup(device, PORT_HSCIF); | |
3294 | } | |
3295 | ||
0b0cced1 | 3296 | OF_EARLYCON_DECLARE(sci, "renesas,sci", sci_early_console_setup); |
0b0cced1 | 3297 | OF_EARLYCON_DECLARE(scif, "renesas,scif", scif_early_console_setup); |
0b0cced1 | 3298 | OF_EARLYCON_DECLARE(scifa, "renesas,scifa", scifa_early_console_setup); |
0b0cced1 | 3299 | OF_EARLYCON_DECLARE(scifb, "renesas,scifb", scifb_early_console_setup); |
0b0cced1 YS |
3300 | OF_EARLYCON_DECLARE(hscif, "renesas,hscif", hscif_early_console_setup); |
3301 | #endif /* CONFIG_SERIAL_SH_SCI_EARLYCON */ | |
3302 | ||
1da177e4 LT |
3303 | module_init(sci_init); |
3304 | module_exit(sci_exit); | |
3305 | ||
e108b2ca | 3306 | MODULE_LICENSE("GPL"); |
e169c139 | 3307 | MODULE_ALIAS("platform:sh-sci"); |
7f405f9c | 3308 | MODULE_AUTHOR("Paul Mundt"); |
f303b364 | 3309 | MODULE_DESCRIPTION("SuperH (H)SCI(F) serial driver"); |