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e3b3d0f5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO) |
4 | * | |
f43dc23d | 5 | * Copyright (C) 2002 - 2011 Paul Mundt |
f4998e55 | 6 | * Copyright (C) 2015 Glider bvba |
3ea6bc3d | 7 | * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007). |
1da177e4 LT |
8 | * |
9 | * based off of the old drivers/char/sh-sci.c by: | |
10 | * | |
11 | * Copyright (C) 1999, 2000 Niibe Yutaka | |
12 | * Copyright (C) 2000 Sugioka Toshinobu | |
13 | * Modified to support multiple serial ports. Stuart Menefy (May 2000). | |
14 | * Modified to support SecureEdge. David McCullough (2002) | |
15 | * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003). | |
d89ddd1c | 16 | * Removed SH7300 support (Jul 2007). |
1da177e4 | 17 | */ |
0b3d4ef6 PM |
18 | #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
19 | #define SUPPORT_SYSRQ | |
20 | #endif | |
1da177e4 LT |
21 | |
22 | #undef DEBUG | |
23 | ||
8fb9631c LP |
24 | #include <linux/clk.h> |
25 | #include <linux/console.h> | |
26 | #include <linux/ctype.h> | |
27 | #include <linux/cpufreq.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/dmaengine.h> | |
30 | #include <linux/dma-mapping.h> | |
31 | #include <linux/err.h> | |
1da177e4 | 32 | #include <linux/errno.h> |
8fb9631c | 33 | #include <linux/init.h> |
1da177e4 | 34 | #include <linux/interrupt.h> |
1da177e4 | 35 | #include <linux/ioport.h> |
b96408b4 | 36 | #include <linux/ktime.h> |
8fb9631c LP |
37 | #include <linux/major.h> |
38 | #include <linux/module.h> | |
1da177e4 | 39 | #include <linux/mm.h> |
20bdcab8 | 40 | #include <linux/of.h> |
6e605a01 | 41 | #include <linux/of_device.h> |
8fb9631c | 42 | #include <linux/platform_device.h> |
5e50d2d6 | 43 | #include <linux/pm_runtime.h> |
73a19e4c | 44 | #include <linux/scatterlist.h> |
8fb9631c LP |
45 | #include <linux/serial.h> |
46 | #include <linux/serial_sci.h> | |
47 | #include <linux/sh_dma.h> | |
5a0e3ad6 | 48 | #include <linux/slab.h> |
8fb9631c LP |
49 | #include <linux/string.h> |
50 | #include <linux/sysrq.h> | |
51 | #include <linux/timer.h> | |
52 | #include <linux/tty.h> | |
53 | #include <linux/tty_flip.h> | |
85f094ec PM |
54 | |
55 | #ifdef CONFIG_SUPERH | |
1da177e4 LT |
56 | #include <asm/sh_bios.h> |
57 | #endif | |
58 | ||
f907c9ea | 59 | #include "serial_mctrl_gpio.h" |
1da177e4 LT |
60 | #include "sh-sci.h" |
61 | ||
89b5c1ab LP |
62 | /* Offsets into the sci_port->irqs array */ |
63 | enum { | |
64 | SCIx_ERI_IRQ, | |
65 | SCIx_RXI_IRQ, | |
66 | SCIx_TXI_IRQ, | |
67 | SCIx_BRI_IRQ, | |
68 | SCIx_NR_IRQS, | |
69 | ||
70 | SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */ | |
71 | }; | |
72 | ||
73 | #define SCIx_IRQ_IS_MUXED(port) \ | |
74 | ((port)->irqs[SCIx_ERI_IRQ] == \ | |
75 | (port)->irqs[SCIx_RXI_IRQ]) || \ | |
76 | ((port)->irqs[SCIx_ERI_IRQ] && \ | |
77 | ((port)->irqs[SCIx_RXI_IRQ] < 0)) | |
78 | ||
f4998e55 GU |
79 | enum SCI_CLKS { |
80 | SCI_FCK, /* Functional Clock */ | |
6af27bf2 | 81 | SCI_SCK, /* Optional External Clock */ |
1270f865 GU |
82 | SCI_BRG_INT, /* Optional BRG Internal Clock Source */ |
83 | SCI_SCIF_CLK, /* Optional BRG External Clock Source */ | |
f4998e55 GU |
84 | SCI_NUM_CLKS |
85 | }; | |
86 | ||
69eee8e9 GU |
87 | /* Bit x set means sampling rate x + 1 is supported */ |
88 | #define SCI_SR(x) BIT((x) - 1) | |
89 | #define SCI_SR_RANGE(x, y) GENMASK((y) - 1, (x) - 1) | |
90 | ||
92a05748 GU |
91 | #define SCI_SR_SCIFAB SCI_SR(5) | SCI_SR(7) | SCI_SR(11) | \ |
92 | SCI_SR(13) | SCI_SR(16) | SCI_SR(17) | \ | |
93 | SCI_SR(19) | SCI_SR(27) | |
94 | ||
69eee8e9 GU |
95 | #define min_sr(_port) ffs((_port)->sampling_rate_mask) |
96 | #define max_sr(_port) fls((_port)->sampling_rate_mask) | |
97 | ||
98 | /* Iterate over all supported sampling rates, from high to low */ | |
99 | #define for_each_sr(_sr, _port) \ | |
100 | for ((_sr) = max_sr(_port); (_sr) >= min_sr(_port); (_sr)--) \ | |
101 | if ((_port)->sampling_rate_mask & SCI_SR((_sr))) | |
102 | ||
e095ee6b LP |
103 | struct plat_sci_reg { |
104 | u8 offset, size; | |
105 | }; | |
106 | ||
107 | struct sci_port_params { | |
108 | const struct plat_sci_reg regs[SCIx_NR_REGS]; | |
b2f20ed9 LP |
109 | unsigned int fifosize; |
110 | unsigned int overrun_reg; | |
111 | unsigned int overrun_mask; | |
112 | unsigned int sampling_rate_mask; | |
113 | unsigned int error_mask; | |
114 | unsigned int error_clear; | |
e095ee6b LP |
115 | }; |
116 | ||
e108b2ca PM |
117 | struct sci_port { |
118 | struct uart_port port; | |
119 | ||
ce6738b6 | 120 | /* Platform configuration */ |
e095ee6b | 121 | const struct sci_port_params *params; |
daf5a895 | 122 | const struct plat_sci_port *cfg; |
69eee8e9 | 123 | unsigned int sampling_rate_mask; |
e4d6f911 | 124 | resource_size_t reg_size; |
f907c9ea | 125 | struct mctrl_gpios *gpios; |
e108b2ca | 126 | |
f4998e55 GU |
127 | /* Clocks */ |
128 | struct clk *clks[SCI_NUM_CLKS]; | |
129 | unsigned long clk_rates[SCI_NUM_CLKS]; | |
edad1f20 | 130 | |
1fcc91a6 | 131 | int irqs[SCIx_NR_IRQS]; |
9174fc8f PM |
132 | char *irqstr[SCIx_NR_IRQS]; |
133 | ||
73a19e4c GL |
134 | struct dma_chan *chan_tx; |
135 | struct dma_chan *chan_rx; | |
f43dc23d | 136 | |
73a19e4c | 137 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
73a19e4c GL |
138 | dma_cookie_t cookie_tx; |
139 | dma_cookie_t cookie_rx[2]; | |
140 | dma_cookie_t active_rx; | |
79904420 GU |
141 | dma_addr_t tx_dma_addr; |
142 | unsigned int tx_dma_len; | |
73a19e4c | 143 | struct scatterlist sg_rx[2]; |
7b39d901 | 144 | void *rx_buf[2]; |
73a19e4c | 145 | size_t buf_len_rx; |
73a19e4c | 146 | struct work_struct work_tx; |
b96408b4 UH |
147 | struct hrtimer rx_timer; |
148 | unsigned int rx_timeout; /* microseconds */ | |
73a19e4c | 149 | #endif |
03940376 | 150 | unsigned int rx_frame; |
18e8cf15 | 151 | int rx_trigger; |
03940376 UH |
152 | struct timer_list rx_fifo_timer; |
153 | int rx_fifo_timeout; | |
fa2abb03 | 154 | u16 hscif_tot; |
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 | 162 | static struct sci_port sci_ports[SCI_NPORTS]; |
7678f4c2 | 163 | static unsigned long sci_ports_in_use; |
e108b2ca | 164 | static struct uart_driver sci_uart_driver; |
1da177e4 | 165 | |
e7c98dc7 MT |
166 | static inline struct sci_port * |
167 | to_sci_port(struct uart_port *uart) | |
168 | { | |
169 | return container_of(uart, struct sci_port, port); | |
170 | } | |
171 | ||
e095ee6b | 172 | static const struct sci_port_params sci_port_params[SCIx_NR_REGTYPES] = { |
61a6976b PM |
173 | /* |
174 | * Common SCI definitions, dependent on the port's regshift | |
175 | * value. | |
176 | */ | |
177 | [SCIx_SCI_REGTYPE] = { | |
e095ee6b LP |
178 | .regs = { |
179 | [SCSMR] = { 0x00, 8 }, | |
180 | [SCBRR] = { 0x01, 8 }, | |
181 | [SCSCR] = { 0x02, 8 }, | |
182 | [SCxTDR] = { 0x03, 8 }, | |
183 | [SCxSR] = { 0x04, 8 }, | |
184 | [SCxRDR] = { 0x05, 8 }, | |
185 | }, | |
b2f20ed9 LP |
186 | .fifosize = 1, |
187 | .overrun_reg = SCxSR, | |
188 | .overrun_mask = SCI_ORER, | |
189 | .sampling_rate_mask = SCI_SR(32), | |
190 | .error_mask = SCI_DEFAULT_ERROR_MASK | SCI_ORER, | |
191 | .error_clear = SCI_ERROR_CLEAR & ~SCI_ORER, | |
61a6976b PM |
192 | }, |
193 | ||
194 | /* | |
a752ba18 | 195 | * Common definitions for legacy IrDA ports. |
61a6976b PM |
196 | */ |
197 | [SCIx_IRDA_REGTYPE] = { | |
e095ee6b LP |
198 | .regs = { |
199 | [SCSMR] = { 0x00, 8 }, | |
200 | [SCBRR] = { 0x02, 8 }, | |
201 | [SCSCR] = { 0x04, 8 }, | |
202 | [SCxTDR] = { 0x06, 8 }, | |
203 | [SCxSR] = { 0x08, 16 }, | |
204 | [SCxRDR] = { 0x0a, 8 }, | |
205 | [SCFCR] = { 0x0c, 8 }, | |
206 | [SCFDR] = { 0x0e, 16 }, | |
207 | }, | |
b2f20ed9 LP |
208 | .fifosize = 1, |
209 | .overrun_reg = SCxSR, | |
210 | .overrun_mask = SCI_ORER, | |
211 | .sampling_rate_mask = SCI_SR(32), | |
212 | .error_mask = SCI_DEFAULT_ERROR_MASK | SCI_ORER, | |
213 | .error_clear = SCI_ERROR_CLEAR & ~SCI_ORER, | |
61a6976b PM |
214 | }, |
215 | ||
216 | /* | |
217 | * Common SCIFA definitions. | |
218 | */ | |
219 | [SCIx_SCIFA_REGTYPE] = { | |
e095ee6b LP |
220 | .regs = { |
221 | [SCSMR] = { 0x00, 16 }, | |
222 | [SCBRR] = { 0x04, 8 }, | |
223 | [SCSCR] = { 0x08, 16 }, | |
224 | [SCxTDR] = { 0x20, 8 }, | |
225 | [SCxSR] = { 0x14, 16 }, | |
226 | [SCxRDR] = { 0x24, 8 }, | |
227 | [SCFCR] = { 0x18, 16 }, | |
228 | [SCFDR] = { 0x1c, 16 }, | |
229 | [SCPCR] = { 0x30, 16 }, | |
230 | [SCPDR] = { 0x34, 16 }, | |
231 | }, | |
b2f20ed9 LP |
232 | .fifosize = 64, |
233 | .overrun_reg = SCxSR, | |
234 | .overrun_mask = SCIFA_ORER, | |
235 | .sampling_rate_mask = SCI_SR_SCIFAB, | |
236 | .error_mask = SCIF_DEFAULT_ERROR_MASK | SCIFA_ORER, | |
237 | .error_clear = SCIF_ERROR_CLEAR & ~SCIFA_ORER, | |
61a6976b PM |
238 | }, |
239 | ||
240 | /* | |
241 | * Common SCIFB definitions. | |
242 | */ | |
243 | [SCIx_SCIFB_REGTYPE] = { | |
e095ee6b LP |
244 | .regs = { |
245 | [SCSMR] = { 0x00, 16 }, | |
246 | [SCBRR] = { 0x04, 8 }, | |
247 | [SCSCR] = { 0x08, 16 }, | |
248 | [SCxTDR] = { 0x40, 8 }, | |
249 | [SCxSR] = { 0x14, 16 }, | |
250 | [SCxRDR] = { 0x60, 8 }, | |
251 | [SCFCR] = { 0x18, 16 }, | |
252 | [SCTFDR] = { 0x38, 16 }, | |
253 | [SCRFDR] = { 0x3c, 16 }, | |
254 | [SCPCR] = { 0x30, 16 }, | |
255 | [SCPDR] = { 0x34, 16 }, | |
256 | }, | |
b2f20ed9 LP |
257 | .fifosize = 256, |
258 | .overrun_reg = SCxSR, | |
259 | .overrun_mask = SCIFA_ORER, | |
260 | .sampling_rate_mask = SCI_SR_SCIFAB, | |
261 | .error_mask = SCIF_DEFAULT_ERROR_MASK | SCIFA_ORER, | |
262 | .error_clear = SCIF_ERROR_CLEAR & ~SCIFA_ORER, | |
61a6976b PM |
263 | }, |
264 | ||
3af1f8a4 PE |
265 | /* |
266 | * Common SH-2(A) SCIF definitions for ports with FIFO data | |
267 | * count registers. | |
268 | */ | |
269 | [SCIx_SH2_SCIF_FIFODATA_REGTYPE] = { | |
e095ee6b LP |
270 | .regs = { |
271 | [SCSMR] = { 0x00, 16 }, | |
272 | [SCBRR] = { 0x04, 8 }, | |
273 | [SCSCR] = { 0x08, 16 }, | |
274 | [SCxTDR] = { 0x0c, 8 }, | |
275 | [SCxSR] = { 0x10, 16 }, | |
276 | [SCxRDR] = { 0x14, 8 }, | |
277 | [SCFCR] = { 0x18, 16 }, | |
278 | [SCFDR] = { 0x1c, 16 }, | |
279 | [SCSPTR] = { 0x20, 16 }, | |
280 | [SCLSR] = { 0x24, 16 }, | |
281 | }, | |
b2f20ed9 LP |
282 | .fifosize = 16, |
283 | .overrun_reg = SCLSR, | |
284 | .overrun_mask = SCLSR_ORER, | |
285 | .sampling_rate_mask = SCI_SR(32), | |
286 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
287 | .error_clear = SCIF_ERROR_CLEAR, | |
3af1f8a4 PE |
288 | }, |
289 | ||
61a6976b PM |
290 | /* |
291 | * Common SH-3 SCIF definitions. | |
292 | */ | |
293 | [SCIx_SH3_SCIF_REGTYPE] = { | |
e095ee6b LP |
294 | .regs = { |
295 | [SCSMR] = { 0x00, 8 }, | |
296 | [SCBRR] = { 0x02, 8 }, | |
297 | [SCSCR] = { 0x04, 8 }, | |
298 | [SCxTDR] = { 0x06, 8 }, | |
299 | [SCxSR] = { 0x08, 16 }, | |
300 | [SCxRDR] = { 0x0a, 8 }, | |
301 | [SCFCR] = { 0x0c, 8 }, | |
302 | [SCFDR] = { 0x0e, 16 }, | |
303 | }, | |
b2f20ed9 LP |
304 | .fifosize = 16, |
305 | .overrun_reg = SCLSR, | |
306 | .overrun_mask = SCLSR_ORER, | |
307 | .sampling_rate_mask = SCI_SR(32), | |
308 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
309 | .error_clear = SCIF_ERROR_CLEAR, | |
61a6976b PM |
310 | }, |
311 | ||
312 | /* | |
313 | * Common SH-4(A) SCIF(B) definitions. | |
314 | */ | |
315 | [SCIx_SH4_SCIF_REGTYPE] = { | |
e095ee6b LP |
316 | .regs = { |
317 | [SCSMR] = { 0x00, 16 }, | |
318 | [SCBRR] = { 0x04, 8 }, | |
319 | [SCSCR] = { 0x08, 16 }, | |
320 | [SCxTDR] = { 0x0c, 8 }, | |
321 | [SCxSR] = { 0x10, 16 }, | |
322 | [SCxRDR] = { 0x14, 8 }, | |
323 | [SCFCR] = { 0x18, 16 }, | |
324 | [SCFDR] = { 0x1c, 16 }, | |
325 | [SCSPTR] = { 0x20, 16 }, | |
326 | [SCLSR] = { 0x24, 16 }, | |
327 | }, | |
b2f20ed9 LP |
328 | .fifosize = 16, |
329 | .overrun_reg = SCLSR, | |
330 | .overrun_mask = SCLSR_ORER, | |
331 | .sampling_rate_mask = SCI_SR(32), | |
332 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
333 | .error_clear = SCIF_ERROR_CLEAR, | |
b8bbd6b2 GU |
334 | }, |
335 | ||
336 | /* | |
337 | * Common SCIF definitions for ports with a Baud Rate Generator for | |
338 | * External Clock (BRG). | |
339 | */ | |
340 | [SCIx_SH4_SCIF_BRG_REGTYPE] = { | |
e095ee6b LP |
341 | .regs = { |
342 | [SCSMR] = { 0x00, 16 }, | |
343 | [SCBRR] = { 0x04, 8 }, | |
344 | [SCSCR] = { 0x08, 16 }, | |
345 | [SCxTDR] = { 0x0c, 8 }, | |
346 | [SCxSR] = { 0x10, 16 }, | |
347 | [SCxRDR] = { 0x14, 8 }, | |
348 | [SCFCR] = { 0x18, 16 }, | |
349 | [SCFDR] = { 0x1c, 16 }, | |
350 | [SCSPTR] = { 0x20, 16 }, | |
351 | [SCLSR] = { 0x24, 16 }, | |
352 | [SCDL] = { 0x30, 16 }, | |
353 | [SCCKS] = { 0x34, 16 }, | |
354 | }, | |
b2f20ed9 LP |
355 | .fifosize = 16, |
356 | .overrun_reg = SCLSR, | |
357 | .overrun_mask = SCLSR_ORER, | |
358 | .sampling_rate_mask = SCI_SR(32), | |
359 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
360 | .error_clear = SCIF_ERROR_CLEAR, | |
f303b364 UH |
361 | }, |
362 | ||
363 | /* | |
364 | * Common HSCIF definitions. | |
365 | */ | |
366 | [SCIx_HSCIF_REGTYPE] = { | |
e095ee6b LP |
367 | .regs = { |
368 | [SCSMR] = { 0x00, 16 }, | |
369 | [SCBRR] = { 0x04, 8 }, | |
370 | [SCSCR] = { 0x08, 16 }, | |
371 | [SCxTDR] = { 0x0c, 8 }, | |
372 | [SCxSR] = { 0x10, 16 }, | |
373 | [SCxRDR] = { 0x14, 8 }, | |
374 | [SCFCR] = { 0x18, 16 }, | |
375 | [SCFDR] = { 0x1c, 16 }, | |
376 | [SCSPTR] = { 0x20, 16 }, | |
377 | [SCLSR] = { 0x24, 16 }, | |
378 | [HSSRR] = { 0x40, 16 }, | |
379 | [SCDL] = { 0x30, 16 }, | |
380 | [SCCKS] = { 0x34, 16 }, | |
54e14ae2 UH |
381 | [HSRTRGR] = { 0x54, 16 }, |
382 | [HSTTRGR] = { 0x58, 16 }, | |
e095ee6b | 383 | }, |
b2f20ed9 LP |
384 | .fifosize = 128, |
385 | .overrun_reg = SCLSR, | |
386 | .overrun_mask = SCLSR_ORER, | |
387 | .sampling_rate_mask = SCI_SR_RANGE(8, 32), | |
388 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
389 | .error_clear = SCIF_ERROR_CLEAR, | |
61a6976b PM |
390 | }, |
391 | ||
392 | /* | |
393 | * Common SH-4(A) SCIF(B) definitions for ports without an SCSPTR | |
394 | * register. | |
395 | */ | |
396 | [SCIx_SH4_SCIF_NO_SCSPTR_REGTYPE] = { | |
e095ee6b LP |
397 | .regs = { |
398 | [SCSMR] = { 0x00, 16 }, | |
399 | [SCBRR] = { 0x04, 8 }, | |
400 | [SCSCR] = { 0x08, 16 }, | |
401 | [SCxTDR] = { 0x0c, 8 }, | |
402 | [SCxSR] = { 0x10, 16 }, | |
403 | [SCxRDR] = { 0x14, 8 }, | |
404 | [SCFCR] = { 0x18, 16 }, | |
405 | [SCFDR] = { 0x1c, 16 }, | |
406 | [SCLSR] = { 0x24, 16 }, | |
407 | }, | |
b2f20ed9 LP |
408 | .fifosize = 16, |
409 | .overrun_reg = SCLSR, | |
410 | .overrun_mask = SCLSR_ORER, | |
411 | .sampling_rate_mask = SCI_SR(32), | |
412 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
413 | .error_clear = SCIF_ERROR_CLEAR, | |
61a6976b PM |
414 | }, |
415 | ||
416 | /* | |
417 | * Common SH-4(A) SCIF(B) definitions for ports with FIFO data | |
418 | * count registers. | |
419 | */ | |
420 | [SCIx_SH4_SCIF_FIFODATA_REGTYPE] = { | |
e095ee6b LP |
421 | .regs = { |
422 | [SCSMR] = { 0x00, 16 }, | |
423 | [SCBRR] = { 0x04, 8 }, | |
424 | [SCSCR] = { 0x08, 16 }, | |
425 | [SCxTDR] = { 0x0c, 8 }, | |
426 | [SCxSR] = { 0x10, 16 }, | |
427 | [SCxRDR] = { 0x14, 8 }, | |
428 | [SCFCR] = { 0x18, 16 }, | |
429 | [SCFDR] = { 0x1c, 16 }, | |
430 | [SCTFDR] = { 0x1c, 16 }, /* aliased to SCFDR */ | |
431 | [SCRFDR] = { 0x20, 16 }, | |
432 | [SCSPTR] = { 0x24, 16 }, | |
433 | [SCLSR] = { 0x28, 16 }, | |
434 | }, | |
b2f20ed9 LP |
435 | .fifosize = 16, |
436 | .overrun_reg = SCLSR, | |
437 | .overrun_mask = SCLSR_ORER, | |
438 | .sampling_rate_mask = SCI_SR(32), | |
439 | .error_mask = SCIF_DEFAULT_ERROR_MASK, | |
440 | .error_clear = SCIF_ERROR_CLEAR, | |
61a6976b PM |
441 | }, |
442 | ||
443 | /* | |
444 | * SH7705-style SCIF(B) ports, lacking both SCSPTR and SCLSR | |
445 | * registers. | |
446 | */ | |
447 | [SCIx_SH7705_SCIF_REGTYPE] = { | |
e095ee6b LP |
448 | .regs = { |
449 | [SCSMR] = { 0x00, 16 }, | |
450 | [SCBRR] = { 0x04, 8 }, | |
451 | [SCSCR] = { 0x08, 16 }, | |
452 | [SCxTDR] = { 0x20, 8 }, | |
453 | [SCxSR] = { 0x14, 16 }, | |
454 | [SCxRDR] = { 0x24, 8 }, | |
455 | [SCFCR] = { 0x18, 16 }, | |
456 | [SCFDR] = { 0x1c, 16 }, | |
457 | }, | |
18e8cf15 | 458 | .fifosize = 64, |
b2f20ed9 LP |
459 | .overrun_reg = SCxSR, |
460 | .overrun_mask = SCIFA_ORER, | |
461 | .sampling_rate_mask = SCI_SR(16), | |
462 | .error_mask = SCIF_DEFAULT_ERROR_MASK | SCIFA_ORER, | |
463 | .error_clear = SCIF_ERROR_CLEAR & ~SCIFA_ORER, | |
61a6976b PM |
464 | }, |
465 | }; | |
466 | ||
e095ee6b | 467 | #define sci_getreg(up, offset) (&to_sci_port(up)->params->regs[offset]) |
72b294cf | 468 | |
61a6976b PM |
469 | /* |
470 | * The "offset" here is rather misleading, in that it refers to an enum | |
471 | * value relative to the port mapping rather than the fixed offset | |
472 | * itself, which needs to be manually retrieved from the platform's | |
473 | * register map for the given port. | |
474 | */ | |
475 | static unsigned int sci_serial_in(struct uart_port *p, int offset) | |
476 | { | |
d3184e68 | 477 | const struct plat_sci_reg *reg = sci_getreg(p, offset); |
61a6976b PM |
478 | |
479 | if (reg->size == 8) | |
480 | return ioread8(p->membase + (reg->offset << p->regshift)); | |
481 | else if (reg->size == 16) | |
482 | return ioread16(p->membase + (reg->offset << p->regshift)); | |
483 | else | |
484 | WARN(1, "Invalid register access\n"); | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | static void sci_serial_out(struct uart_port *p, int offset, int value) | |
490 | { | |
d3184e68 | 491 | const struct plat_sci_reg *reg = sci_getreg(p, offset); |
61a6976b PM |
492 | |
493 | if (reg->size == 8) | |
494 | iowrite8(value, p->membase + (reg->offset << p->regshift)); | |
495 | else if (reg->size == 16) | |
496 | iowrite16(value, p->membase + (reg->offset << p->regshift)); | |
497 | else | |
498 | WARN(1, "Invalid register access\n"); | |
499 | } | |
500 | ||
23241d43 PM |
501 | static void sci_port_enable(struct sci_port *sci_port) |
502 | { | |
f4998e55 GU |
503 | unsigned int i; |
504 | ||
23241d43 PM |
505 | if (!sci_port->port.dev) |
506 | return; | |
507 | ||
508 | pm_runtime_get_sync(sci_port->port.dev); | |
509 | ||
f4998e55 GU |
510 | for (i = 0; i < SCI_NUM_CLKS; i++) { |
511 | clk_prepare_enable(sci_port->clks[i]); | |
512 | sci_port->clk_rates[i] = clk_get_rate(sci_port->clks[i]); | |
513 | } | |
514 | sci_port->port.uartclk = sci_port->clk_rates[SCI_FCK]; | |
23241d43 PM |
515 | } |
516 | ||
517 | static void sci_port_disable(struct sci_port *sci_port) | |
518 | { | |
f4998e55 GU |
519 | unsigned int i; |
520 | ||
23241d43 PM |
521 | if (!sci_port->port.dev) |
522 | return; | |
523 | ||
f4998e55 GU |
524 | for (i = SCI_NUM_CLKS; i-- > 0; ) |
525 | clk_disable_unprepare(sci_port->clks[i]); | |
23241d43 PM |
526 | |
527 | pm_runtime_put_sync(sci_port->port.dev); | |
528 | } | |
529 | ||
e1910fcd GU |
530 | static inline unsigned long port_rx_irq_mask(struct uart_port *port) |
531 | { | |
532 | /* | |
533 | * Not all ports (such as SCIFA) will support REIE. Rather than | |
534 | * special-casing the port type, we check the port initialization | |
535 | * IRQ enable mask to see whether the IRQ is desired at all. If | |
536 | * it's unset, it's logically inferred that there's no point in | |
537 | * testing for it. | |
538 | */ | |
539 | return SCSCR_RIE | (to_sci_port(port)->cfg->scscr & SCSCR_REIE); | |
540 | } | |
541 | ||
542 | static void sci_start_tx(struct uart_port *port) | |
543 | { | |
544 | struct sci_port *s = to_sci_port(port); | |
545 | unsigned short ctrl; | |
546 | ||
547 | #ifdef CONFIG_SERIAL_SH_SCI_DMA | |
548 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
549 | u16 new, scr = serial_port_in(port, SCSCR); | |
550 | if (s->chan_tx) | |
551 | new = scr | SCSCR_TDRQE; | |
552 | else | |
553 | new = scr & ~SCSCR_TDRQE; | |
554 | if (new != scr) | |
555 | serial_port_out(port, SCSCR, new); | |
556 | } | |
557 | ||
558 | if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) && | |
559 | dma_submit_error(s->cookie_tx)) { | |
560 | s->cookie_tx = 0; | |
561 | schedule_work(&s->work_tx); | |
562 | } | |
563 | #endif | |
564 | ||
565 | if (!s->chan_tx || port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
566 | /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */ | |
567 | ctrl = serial_port_in(port, SCSCR); | |
568 | serial_port_out(port, SCSCR, ctrl | SCSCR_TIE); | |
569 | } | |
570 | } | |
571 | ||
572 | static void sci_stop_tx(struct uart_port *port) | |
573 | { | |
574 | unsigned short ctrl; | |
575 | ||
576 | /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */ | |
577 | ctrl = serial_port_in(port, SCSCR); | |
578 | ||
579 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) | |
580 | ctrl &= ~SCSCR_TDRQE; | |
581 | ||
582 | ctrl &= ~SCSCR_TIE; | |
583 | ||
584 | serial_port_out(port, SCSCR, ctrl); | |
585 | } | |
586 | ||
587 | static void sci_start_rx(struct uart_port *port) | |
588 | { | |
589 | unsigned short ctrl; | |
590 | ||
591 | ctrl = serial_port_in(port, SCSCR) | port_rx_irq_mask(port); | |
592 | ||
593 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) | |
594 | ctrl &= ~SCSCR_RDRQE; | |
595 | ||
596 | serial_port_out(port, SCSCR, ctrl); | |
597 | } | |
598 | ||
599 | static void sci_stop_rx(struct uart_port *port) | |
600 | { | |
601 | unsigned short ctrl; | |
602 | ||
603 | ctrl = serial_port_in(port, SCSCR); | |
604 | ||
605 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) | |
606 | ctrl &= ~SCSCR_RDRQE; | |
607 | ||
608 | ctrl &= ~port_rx_irq_mask(port); | |
609 | ||
610 | serial_port_out(port, SCSCR, ctrl); | |
611 | } | |
612 | ||
a1b5b43f GU |
613 | static void sci_clear_SCxSR(struct uart_port *port, unsigned int mask) |
614 | { | |
615 | if (port->type == PORT_SCI) { | |
616 | /* Just store the mask */ | |
617 | serial_port_out(port, SCxSR, mask); | |
b2f20ed9 | 618 | } else if (to_sci_port(port)->params->overrun_mask == SCIFA_ORER) { |
a1b5b43f GU |
619 | /* SCIFA/SCIFB and SCIF on SH7705/SH7720/SH7721 */ |
620 | /* Only clear the status bits we want to clear */ | |
621 | serial_port_out(port, SCxSR, | |
622 | serial_port_in(port, SCxSR) & mask); | |
623 | } else { | |
624 | /* Store the mask, clear parity/framing errors */ | |
625 | serial_port_out(port, SCxSR, mask & ~(SCIF_FERC | SCIF_PERC)); | |
626 | } | |
627 | } | |
628 | ||
0b0cced1 YS |
629 | #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || \ |
630 | defined(CONFIG_SERIAL_SH_SCI_EARLYCON) | |
1f6fd5c9 PM |
631 | |
632 | #ifdef CONFIG_CONSOLE_POLL | |
07d2a1a1 | 633 | static int sci_poll_get_char(struct uart_port *port) |
1da177e4 | 634 | { |
1da177e4 LT |
635 | unsigned short status; |
636 | int c; | |
637 | ||
e108b2ca | 638 | do { |
b12bb29f | 639 | status = serial_port_in(port, SCxSR); |
1da177e4 | 640 | if (status & SCxSR_ERRORS(port)) { |
a1b5b43f | 641 | sci_clear_SCxSR(port, SCxSR_ERROR_CLEAR(port)); |
1da177e4 LT |
642 | continue; |
643 | } | |
3f255eb3 JW |
644 | break; |
645 | } while (1); | |
646 | ||
647 | if (!(status & SCxSR_RDxF(port))) | |
648 | return NO_POLL_CHAR; | |
07d2a1a1 | 649 | |
b12bb29f | 650 | c = serial_port_in(port, SCxRDR); |
07d2a1a1 | 651 | |
e7c98dc7 | 652 | /* Dummy read */ |
b12bb29f | 653 | serial_port_in(port, SCxSR); |
a1b5b43f | 654 | sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port)); |
1da177e4 LT |
655 | |
656 | return c; | |
657 | } | |
1f6fd5c9 | 658 | #endif |
1da177e4 | 659 | |
07d2a1a1 | 660 | static void sci_poll_put_char(struct uart_port *port, unsigned char c) |
1da177e4 | 661 | { |
1da177e4 LT |
662 | unsigned short status; |
663 | ||
1da177e4 | 664 | do { |
b12bb29f | 665 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
666 | } while (!(status & SCxSR_TDxE(port))); |
667 | ||
b12bb29f | 668 | serial_port_out(port, SCxTDR, c); |
a1b5b43f | 669 | sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port)); |
1da177e4 | 670 | } |
0b0cced1 YS |
671 | #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE || |
672 | CONFIG_SERIAL_SH_SCI_EARLYCON */ | |
1da177e4 | 673 | |
61a6976b | 674 | static void sci_init_pins(struct uart_port *port, unsigned int cflag) |
1da177e4 | 675 | { |
61a6976b | 676 | struct sci_port *s = to_sci_port(port); |
1da177e4 | 677 | |
61a6976b PM |
678 | /* |
679 | * Use port-specific handler if provided. | |
680 | */ | |
681 | if (s->cfg->ops && s->cfg->ops->init_pins) { | |
682 | s->cfg->ops->init_pins(port, cflag); | |
683 | return; | |
1da177e4 | 684 | } |
41504c39 | 685 | |
e9d7a45a | 686 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { |
cfa6eb23 | 687 | u16 data = serial_port_in(port, SCPDR); |
e9d7a45a GU |
688 | u16 ctrl = serial_port_in(port, SCPCR); |
689 | ||
690 | /* Enable RXD and TXD pin functions */ | |
691 | ctrl &= ~(SCPCR_RXDC | SCPCR_TXDC); | |
97ed9790 | 692 | if (to_sci_port(port)->has_rtscts) { |
cfa6eb23 GU |
693 | /* RTS# is output, active low, unless autorts */ |
694 | if (!(port->mctrl & TIOCM_RTS)) { | |
695 | ctrl |= SCPCR_RTSC; | |
696 | data |= SCPDR_RTSD; | |
697 | } else if (!s->autorts) { | |
698 | ctrl |= SCPCR_RTSC; | |
699 | data &= ~SCPDR_RTSD; | |
700 | } else { | |
701 | /* Enable RTS# pin function */ | |
702 | ctrl &= ~SCPCR_RTSC; | |
703 | } | |
e9d7a45a GU |
704 | /* Enable CTS# pin function */ |
705 | ctrl &= ~SCPCR_CTSC; | |
706 | } | |
cfa6eb23 | 707 | serial_port_out(port, SCPDR, data); |
e9d7a45a GU |
708 | serial_port_out(port, SCPCR, ctrl); |
709 | } else if (sci_getreg(port, SCSPTR)->size) { | |
d2b9775d GU |
710 | u16 status = serial_port_in(port, SCSPTR); |
711 | ||
cfa6eb23 GU |
712 | /* RTS# is always output; and active low, unless autorts */ |
713 | status |= SCSPTR_RTSIO; | |
714 | if (!(port->mctrl & TIOCM_RTS)) | |
715 | status |= SCSPTR_RTSDT; | |
716 | else if (!s->autorts) | |
717 | status &= ~SCSPTR_RTSDT; | |
d2b9775d GU |
718 | /* CTS# and SCK are inputs */ |
719 | status &= ~(SCSPTR_CTSIO | SCSPTR_SCKIO); | |
720 | serial_port_out(port, SCSPTR, status); | |
faf02f8f | 721 | } |
d5701647 | 722 | } |
e108b2ca | 723 | |
72b294cf | 724 | static int sci_txfill(struct uart_port *port) |
e108b2ca | 725 | { |
b2f20ed9 LP |
726 | struct sci_port *s = to_sci_port(port); |
727 | unsigned int fifo_mask = (s->params->fifosize << 1) - 1; | |
d3184e68 | 728 | const struct plat_sci_reg *reg; |
e108b2ca | 729 | |
72b294cf PM |
730 | reg = sci_getreg(port, SCTFDR); |
731 | if (reg->size) | |
b2f20ed9 | 732 | return serial_port_in(port, SCTFDR) & fifo_mask; |
c63847a3 | 733 | |
72b294cf PM |
734 | reg = sci_getreg(port, SCFDR); |
735 | if (reg->size) | |
b12bb29f | 736 | return serial_port_in(port, SCFDR) >> 8; |
d1d4b10c | 737 | |
b12bb29f | 738 | return !(serial_port_in(port, SCxSR) & SCI_TDRE); |
e108b2ca PM |
739 | } |
740 | ||
73a19e4c GL |
741 | static int sci_txroom(struct uart_port *port) |
742 | { | |
72b294cf | 743 | return port->fifosize - sci_txfill(port); |
73a19e4c GL |
744 | } |
745 | ||
746 | static int sci_rxfill(struct uart_port *port) | |
e108b2ca | 747 | { |
b2f20ed9 LP |
748 | struct sci_port *s = to_sci_port(port); |
749 | unsigned int fifo_mask = (s->params->fifosize << 1) - 1; | |
d3184e68 | 750 | const struct plat_sci_reg *reg; |
72b294cf PM |
751 | |
752 | reg = sci_getreg(port, SCRFDR); | |
753 | if (reg->size) | |
b2f20ed9 | 754 | return serial_port_in(port, SCRFDR) & fifo_mask; |
72b294cf PM |
755 | |
756 | reg = sci_getreg(port, SCFDR); | |
757 | if (reg->size) | |
b2f20ed9 | 758 | return serial_port_in(port, SCFDR) & fifo_mask; |
72b294cf | 759 | |
b12bb29f | 760 | return (serial_port_in(port, SCxSR) & SCxSR_RDxF(port)) != 0; |
e108b2ca PM |
761 | } |
762 | ||
1da177e4 LT |
763 | /* ********************************************************************** * |
764 | * the interrupt related routines * | |
765 | * ********************************************************************** */ | |
766 | ||
767 | static void sci_transmit_chars(struct uart_port *port) | |
768 | { | |
ebd2c8f6 | 769 | struct circ_buf *xmit = &port->state->xmit; |
1da177e4 | 770 | unsigned int stopped = uart_tx_stopped(port); |
1da177e4 LT |
771 | unsigned short status; |
772 | unsigned short ctrl; | |
e108b2ca | 773 | int count; |
1da177e4 | 774 | |
b12bb29f | 775 | status = serial_port_in(port, SCxSR); |
1da177e4 | 776 | if (!(status & SCxSR_TDxE(port))) { |
b12bb29f | 777 | ctrl = serial_port_in(port, SCSCR); |
e7c98dc7 | 778 | if (uart_circ_empty(xmit)) |
8e698614 | 779 | ctrl &= ~SCSCR_TIE; |
e7c98dc7 | 780 | else |
8e698614 | 781 | ctrl |= SCSCR_TIE; |
b12bb29f | 782 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
783 | return; |
784 | } | |
785 | ||
72b294cf | 786 | count = sci_txroom(port); |
1da177e4 LT |
787 | |
788 | do { | |
789 | unsigned char c; | |
790 | ||
791 | if (port->x_char) { | |
792 | c = port->x_char; | |
793 | port->x_char = 0; | |
794 | } else if (!uart_circ_empty(xmit) && !stopped) { | |
795 | c = xmit->buf[xmit->tail]; | |
796 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
797 | } else { | |
798 | break; | |
799 | } | |
800 | ||
b12bb29f | 801 | serial_port_out(port, SCxTDR, c); |
1da177e4 LT |
802 | |
803 | port->icount.tx++; | |
804 | } while (--count > 0); | |
805 | ||
a1b5b43f | 806 | sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port)); |
1da177e4 LT |
807 | |
808 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
809 | uart_write_wakeup(port); | |
810 | if (uart_circ_empty(xmit)) { | |
b129a8cc | 811 | sci_stop_tx(port); |
1da177e4 | 812 | } else { |
b12bb29f | 813 | ctrl = serial_port_in(port, SCSCR); |
1da177e4 | 814 | |
1a22f08d | 815 | if (port->type != PORT_SCI) { |
b12bb29f | 816 | serial_port_in(port, SCxSR); /* Dummy read */ |
a1b5b43f | 817 | sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port)); |
1da177e4 | 818 | } |
1da177e4 | 819 | |
8e698614 | 820 | ctrl |= SCSCR_TIE; |
b12bb29f | 821 | serial_port_out(port, SCSCR, ctrl); |
1da177e4 LT |
822 | } |
823 | } | |
824 | ||
825 | /* On SH3, SCIF may read end-of-break as a space->mark char */ | |
e7c98dc7 | 826 | #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); }) |
1da177e4 | 827 | |
94c8b6db | 828 | static void sci_receive_chars(struct uart_port *port) |
1da177e4 | 829 | { |
227434f8 | 830 | struct tty_port *tport = &port->state->port; |
1da177e4 LT |
831 | int i, count, copied = 0; |
832 | unsigned short status; | |
33f0f88f | 833 | unsigned char flag; |
1da177e4 | 834 | |
b12bb29f | 835 | status = serial_port_in(port, SCxSR); |
1da177e4 LT |
836 | if (!(status & SCxSR_RDxF(port))) |
837 | return; | |
838 | ||
839 | while (1) { | |
1da177e4 | 840 | /* Don't copy more bytes than there is room for in the buffer */ |
227434f8 | 841 | count = tty_buffer_request_room(tport, sci_rxfill(port)); |
1da177e4 LT |
842 | |
843 | /* If for any reason we can't copy more data, we're done! */ | |
844 | if (count == 0) | |
845 | break; | |
846 | ||
847 | if (port->type == PORT_SCI) { | |
b12bb29f | 848 | char c = serial_port_in(port, SCxRDR); |
d5cb1319 | 849 | if (uart_handle_sysrq_char(port, c)) |
1da177e4 | 850 | count = 0; |
e7c98dc7 | 851 | else |
92a19f9c | 852 | tty_insert_flip_char(tport, c, TTY_NORMAL); |
1da177e4 | 853 | } else { |
e7c98dc7 | 854 | for (i = 0; i < count; i++) { |
b12bb29f | 855 | char c = serial_port_in(port, SCxRDR); |
d97fbbed | 856 | |
b12bb29f | 857 | status = serial_port_in(port, SCxSR); |
7d12e780 | 858 | if (uart_handle_sysrq_char(port, c)) { |
1da177e4 LT |
859 | count--; i--; |
860 | continue; | |
861 | } | |
862 | ||
863 | /* Store data and status */ | |
73a19e4c | 864 | if (status & SCxSR_FER(port)) { |
33f0f88f | 865 | flag = TTY_FRAME; |
d97fbbed | 866 | port->icount.frame++; |
762c69e3 | 867 | dev_notice(port->dev, "frame error\n"); |
73a19e4c | 868 | } else if (status & SCxSR_PER(port)) { |
33f0f88f | 869 | flag = TTY_PARITY; |
d97fbbed | 870 | port->icount.parity++; |
762c69e3 | 871 | dev_notice(port->dev, "parity error\n"); |
33f0f88f AC |
872 | } else |
873 | flag = TTY_NORMAL; | |
762c69e3 | 874 | |
92a19f9c | 875 | tty_insert_flip_char(tport, c, flag); |
1da177e4 LT |
876 | } |
877 | } | |
878 | ||
b12bb29f | 879 | serial_port_in(port, SCxSR); /* dummy read */ |
a1b5b43f | 880 | sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port)); |
1da177e4 | 881 | |
1da177e4 LT |
882 | copied += count; |
883 | port->icount.rx += count; | |
884 | } | |
885 | ||
886 | if (copied) { | |
887 | /* Tell the rest of the system the news. New characters! */ | |
2e124b4a | 888 | tty_flip_buffer_push(tport); |
1da177e4 | 889 | } else { |
7842055b UH |
890 | /* TTY buffers full; read from RX reg to prevent lockup */ |
891 | serial_port_in(port, SCxRDR); | |
b12bb29f | 892 | serial_port_in(port, SCxSR); /* dummy read */ |
a1b5b43f | 893 | sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port)); |
1da177e4 LT |
894 | } |
895 | } | |
896 | ||
94c8b6db | 897 | static int sci_handle_errors(struct uart_port *port) |
1da177e4 LT |
898 | { |
899 | int copied = 0; | |
b12bb29f | 900 | unsigned short status = serial_port_in(port, SCxSR); |
92a19f9c | 901 | struct tty_port *tport = &port->state->port; |
debf9507 | 902 | struct sci_port *s = to_sci_port(port); |
1da177e4 | 903 | |
3ae988d9 | 904 | /* Handle overruns */ |
b2f20ed9 | 905 | if (status & s->params->overrun_mask) { |
3ae988d9 | 906 | port->icount.overrun++; |
d97fbbed | 907 | |
3ae988d9 LP |
908 | /* overrun error */ |
909 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN)) | |
910 | copied++; | |
762c69e3 | 911 | |
9b971cd2 | 912 | dev_notice(port->dev, "overrun error\n"); |
1da177e4 LT |
913 | } |
914 | ||
e108b2ca | 915 | if (status & SCxSR_FER(port)) { |
d5cb1319 LP |
916 | /* frame error */ |
917 | port->icount.frame++; | |
d97fbbed | 918 | |
d5cb1319 LP |
919 | if (tty_insert_flip_char(tport, 0, TTY_FRAME)) |
920 | copied++; | |
762c69e3 | 921 | |
d5cb1319 | 922 | dev_notice(port->dev, "frame error\n"); |
1da177e4 LT |
923 | } |
924 | ||
e108b2ca | 925 | if (status & SCxSR_PER(port)) { |
1da177e4 | 926 | /* parity error */ |
d97fbbed PM |
927 | port->icount.parity++; |
928 | ||
92a19f9c | 929 | if (tty_insert_flip_char(tport, 0, TTY_PARITY)) |
e108b2ca | 930 | copied++; |
762c69e3 | 931 | |
9b971cd2 | 932 | dev_notice(port->dev, "parity error\n"); |
1da177e4 LT |
933 | } |
934 | ||
33f0f88f | 935 | if (copied) |
2e124b4a | 936 | tty_flip_buffer_push(tport); |
1da177e4 LT |
937 | |
938 | return copied; | |
939 | } | |
940 | ||
94c8b6db | 941 | static int sci_handle_fifo_overrun(struct uart_port *port) |
d830fa45 | 942 | { |
92a19f9c | 943 | struct tty_port *tport = &port->state->port; |
debf9507 | 944 | struct sci_port *s = to_sci_port(port); |
d3184e68 | 945 | const struct plat_sci_reg *reg; |
2e0842a1 | 946 | int copied = 0; |
75c249fd | 947 | u16 status; |
d830fa45 | 948 | |
b2f20ed9 | 949 | reg = sci_getreg(port, s->params->overrun_reg); |
4b8c59a3 | 950 | if (!reg->size) |
d830fa45 PM |
951 | return 0; |
952 | ||
b2f20ed9 LP |
953 | status = serial_port_in(port, s->params->overrun_reg); |
954 | if (status & s->params->overrun_mask) { | |
955 | status &= ~s->params->overrun_mask; | |
956 | serial_port_out(port, s->params->overrun_reg, status); | |
d830fa45 | 957 | |
d97fbbed PM |
958 | port->icount.overrun++; |
959 | ||
92a19f9c | 960 | tty_insert_flip_char(tport, 0, TTY_OVERRUN); |
2e124b4a | 961 | tty_flip_buffer_push(tport); |
d830fa45 | 962 | |
51b31f1c | 963 | dev_dbg(port->dev, "overrun error\n"); |
d830fa45 PM |
964 | copied++; |
965 | } | |
966 | ||
967 | return copied; | |
968 | } | |
969 | ||
94c8b6db | 970 | static int sci_handle_breaks(struct uart_port *port) |
1da177e4 LT |
971 | { |
972 | int copied = 0; | |
b12bb29f | 973 | unsigned short status = serial_port_in(port, SCxSR); |
92a19f9c | 974 | struct tty_port *tport = &port->state->port; |
1da177e4 | 975 | |
0b3d4ef6 PM |
976 | if (uart_handle_break(port)) |
977 | return 0; | |
978 | ||
d5cb1319 | 979 | if (status & SCxSR_BRK(port)) { |
d97fbbed PM |
980 | port->icount.brk++; |
981 | ||
1da177e4 | 982 | /* Notify of BREAK */ |
92a19f9c | 983 | if (tty_insert_flip_char(tport, 0, TTY_BREAK)) |
33f0f88f | 984 | copied++; |
762c69e3 PM |
985 | |
986 | dev_dbg(port->dev, "BREAK detected\n"); | |
1da177e4 LT |
987 | } |
988 | ||
33f0f88f | 989 | if (copied) |
2e124b4a | 990 | tty_flip_buffer_push(tport); |
e108b2ca | 991 | |
d830fa45 PM |
992 | copied += sci_handle_fifo_overrun(port); |
993 | ||
1da177e4 LT |
994 | return copied; |
995 | } | |
996 | ||
a380ed46 UH |
997 | static int scif_set_rtrg(struct uart_port *port, int rx_trig) |
998 | { | |
999 | unsigned int bits; | |
1000 | ||
1001 | if (rx_trig < 1) | |
1002 | rx_trig = 1; | |
1003 | if (rx_trig >= port->fifosize) | |
1004 | rx_trig = port->fifosize; | |
1005 | ||
1006 | /* HSCIF can be set to an arbitrary level. */ | |
1007 | if (sci_getreg(port, HSRTRGR)->size) { | |
1008 | serial_port_out(port, HSRTRGR, rx_trig); | |
1009 | return rx_trig; | |
1010 | } | |
1011 | ||
1012 | switch (port->type) { | |
1013 | case PORT_SCIF: | |
1014 | if (rx_trig < 4) { | |
1015 | bits = 0; | |
1016 | rx_trig = 1; | |
1017 | } else if (rx_trig < 8) { | |
1018 | bits = SCFCR_RTRG0; | |
1019 | rx_trig = 4; | |
1020 | } else if (rx_trig < 14) { | |
1021 | bits = SCFCR_RTRG1; | |
1022 | rx_trig = 8; | |
1023 | } else { | |
1024 | bits = SCFCR_RTRG0 | SCFCR_RTRG1; | |
1025 | rx_trig = 14; | |
1026 | } | |
1027 | break; | |
1028 | case PORT_SCIFA: | |
1029 | case PORT_SCIFB: | |
1030 | if (rx_trig < 16) { | |
1031 | bits = 0; | |
1032 | rx_trig = 1; | |
1033 | } else if (rx_trig < 32) { | |
1034 | bits = SCFCR_RTRG0; | |
1035 | rx_trig = 16; | |
1036 | } else if (rx_trig < 48) { | |
1037 | bits = SCFCR_RTRG1; | |
1038 | rx_trig = 32; | |
1039 | } else { | |
1040 | bits = SCFCR_RTRG0 | SCFCR_RTRG1; | |
1041 | rx_trig = 48; | |
1042 | } | |
1043 | break; | |
1044 | default: | |
1045 | WARN(1, "unknown FIFO configuration"); | |
1046 | return 1; | |
1047 | } | |
1048 | ||
1049 | serial_port_out(port, SCFCR, | |
1050 | (serial_port_in(port, SCFCR) & | |
1051 | ~(SCFCR_RTRG1 | SCFCR_RTRG0)) | bits); | |
1052 | ||
1053 | return rx_trig; | |
1054 | } | |
1055 | ||
03940376 UH |
1056 | static int scif_rtrg_enabled(struct uart_port *port) |
1057 | { | |
1058 | if (sci_getreg(port, HSRTRGR)->size) | |
1059 | return serial_port_in(port, HSRTRGR) != 0; | |
1060 | else | |
1061 | return (serial_port_in(port, SCFCR) & | |
1062 | (SCFCR_RTRG0 | SCFCR_RTRG1)) != 0; | |
1063 | } | |
1064 | ||
e99e88a9 | 1065 | static void rx_fifo_timer_fn(struct timer_list *t) |
03940376 | 1066 | { |
e99e88a9 | 1067 | struct sci_port *s = from_timer(s, t, rx_fifo_timer); |
03940376 UH |
1068 | struct uart_port *port = &s->port; |
1069 | ||
1070 | dev_dbg(port->dev, "Rx timed out\n"); | |
1071 | scif_set_rtrg(port, 1); | |
1072 | } | |
1073 | ||
5d23188a UH |
1074 | static ssize_t rx_trigger_show(struct device *dev, |
1075 | struct device_attribute *attr, | |
1076 | char *buf) | |
1077 | { | |
1078 | struct uart_port *port = dev_get_drvdata(dev); | |
1079 | struct sci_port *sci = to_sci_port(port); | |
1080 | ||
1081 | return sprintf(buf, "%d\n", sci->rx_trigger); | |
1082 | } | |
1083 | ||
1084 | static ssize_t rx_trigger_store(struct device *dev, | |
1085 | struct device_attribute *attr, | |
1086 | const char *buf, | |
1087 | size_t count) | |
1088 | { | |
1089 | struct uart_port *port = dev_get_drvdata(dev); | |
1090 | struct sci_port *sci = to_sci_port(port); | |
4ab3c51e | 1091 | int ret; |
5d23188a UH |
1092 | long r; |
1093 | ||
4ab3c51e DC |
1094 | ret = kstrtol(buf, 0, &r); |
1095 | if (ret) | |
1096 | return ret; | |
90afa525 | 1097 | |
5d23188a | 1098 | sci->rx_trigger = scif_set_rtrg(port, r); |
90afa525 UH |
1099 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
1100 | scif_set_rtrg(port, 1); | |
1101 | ||
5d23188a UH |
1102 | return count; |
1103 | } | |
1104 | ||
1105 | static DEVICE_ATTR(rx_fifo_trigger, 0644, rx_trigger_show, rx_trigger_store); | |
1106 | ||
1107 | static ssize_t rx_fifo_timeout_show(struct device *dev, | |
1108 | struct device_attribute *attr, | |
1109 | char *buf) | |
1110 | { | |
1111 | struct uart_port *port = dev_get_drvdata(dev); | |
1112 | struct sci_port *sci = to_sci_port(port); | |
fa2abb03 | 1113 | int v; |
5d23188a | 1114 | |
fa2abb03 UH |
1115 | if (port->type == PORT_HSCIF) |
1116 | v = sci->hscif_tot >> HSSCR_TOT_SHIFT; | |
1117 | else | |
1118 | v = sci->rx_fifo_timeout; | |
1119 | ||
1120 | return sprintf(buf, "%d\n", v); | |
5d23188a UH |
1121 | } |
1122 | ||
1123 | static ssize_t rx_fifo_timeout_store(struct device *dev, | |
1124 | struct device_attribute *attr, | |
1125 | const char *buf, | |
1126 | size_t count) | |
1127 | { | |
1128 | struct uart_port *port = dev_get_drvdata(dev); | |
1129 | struct sci_port *sci = to_sci_port(port); | |
4ab3c51e | 1130 | int ret; |
5d23188a UH |
1131 | long r; |
1132 | ||
4ab3c51e DC |
1133 | ret = kstrtol(buf, 0, &r); |
1134 | if (ret) | |
1135 | return ret; | |
fa2abb03 UH |
1136 | |
1137 | if (port->type == PORT_HSCIF) { | |
1138 | if (r < 0 || r > 3) | |
1139 | return -EINVAL; | |
1140 | sci->hscif_tot = r << HSSCR_TOT_SHIFT; | |
1141 | } else { | |
1142 | sci->rx_fifo_timeout = r; | |
1143 | scif_set_rtrg(port, 1); | |
1144 | if (r > 0) | |
e99e88a9 | 1145 | timer_setup(&sci->rx_fifo_timer, rx_fifo_timer_fn, 0); |
fa2abb03 UH |
1146 | } |
1147 | ||
5d23188a UH |
1148 | return count; |
1149 | } | |
1150 | ||
b6b996b6 | 1151 | static DEVICE_ATTR_RW(rx_fifo_timeout); |
5d23188a UH |
1152 | |
1153 | ||
73a19e4c | 1154 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
e1910fcd GU |
1155 | static void sci_dma_tx_complete(void *arg) |
1156 | { | |
1157 | struct sci_port *s = arg; | |
1158 | struct uart_port *port = &s->port; | |
1159 | struct circ_buf *xmit = &port->state->xmit; | |
1160 | unsigned long flags; | |
73a19e4c | 1161 | |
e1910fcd | 1162 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
73a19e4c | 1163 | |
e1910fcd | 1164 | spin_lock_irqsave(&port->lock, flags); |
73a19e4c | 1165 | |
e1910fcd GU |
1166 | xmit->tail += s->tx_dma_len; |
1167 | xmit->tail &= UART_XMIT_SIZE - 1; | |
73a19e4c | 1168 | |
e1910fcd | 1169 | port->icount.tx += s->tx_dma_len; |
1da177e4 | 1170 | |
e1910fcd GU |
1171 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
1172 | uart_write_wakeup(port); | |
1da177e4 | 1173 | |
e1910fcd GU |
1174 | if (!uart_circ_empty(xmit)) { |
1175 | s->cookie_tx = 0; | |
1176 | schedule_work(&s->work_tx); | |
1177 | } else { | |
1178 | s->cookie_tx = -EINVAL; | |
1179 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1180 | u16 ctrl = serial_port_in(port, SCSCR); | |
1181 | serial_port_out(port, SCSCR, ctrl & ~SCSCR_TIE); | |
1182 | } | |
1183 | } | |
1da177e4 | 1184 | |
fd78a76a | 1185 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
1186 | } |
1187 | ||
e1910fcd GU |
1188 | /* Locking: called with port lock held */ |
1189 | static int sci_dma_rx_push(struct sci_port *s, void *buf, size_t count) | |
1da177e4 | 1190 | { |
e1910fcd GU |
1191 | struct uart_port *port = &s->port; |
1192 | struct tty_port *tport = &port->state->port; | |
1193 | int copied; | |
1da177e4 | 1194 | |
e1910fcd | 1195 | copied = tty_insert_flip_string(tport, buf, count); |
6fc5a520 | 1196 | if (copied < count) |
e1910fcd | 1197 | port->icount.buf_overrun++; |
1da177e4 | 1198 | |
e1910fcd | 1199 | port->icount.rx += copied; |
1da177e4 | 1200 | |
e1910fcd | 1201 | return copied; |
1da177e4 LT |
1202 | } |
1203 | ||
e1910fcd | 1204 | static int sci_dma_rx_find_active(struct sci_port *s) |
1da177e4 | 1205 | { |
e1910fcd | 1206 | unsigned int i; |
1da177e4 | 1207 | |
e1910fcd GU |
1208 | for (i = 0; i < ARRAY_SIZE(s->cookie_rx); i++) |
1209 | if (s->active_rx == s->cookie_rx[i]) | |
1210 | return i; | |
1da177e4 | 1211 | |
e1910fcd | 1212 | return -1; |
1da177e4 LT |
1213 | } |
1214 | ||
e1910fcd | 1215 | static void sci_rx_dma_release(struct sci_port *s, bool enable_pio) |
f43dc23d | 1216 | { |
e1910fcd GU |
1217 | struct dma_chan *chan = s->chan_rx; |
1218 | struct uart_port *port = &s->port; | |
1219 | unsigned long flags; | |
1220 | ||
1221 | spin_lock_irqsave(&port->lock, flags); | |
1222 | s->chan_rx = NULL; | |
1223 | s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL; | |
1224 | spin_unlock_irqrestore(&port->lock, flags); | |
1225 | dmaengine_terminate_all(chan); | |
1226 | dma_free_coherent(chan->device->dev, s->buf_len_rx * 2, s->rx_buf[0], | |
1227 | sg_dma_address(&s->sg_rx[0])); | |
1228 | dma_release_channel(chan); | |
1be22663 TA |
1229 | if (enable_pio) { |
1230 | spin_lock_irqsave(&port->lock, flags); | |
e1910fcd | 1231 | sci_start_rx(port); |
1be22663 TA |
1232 | spin_unlock_irqrestore(&port->lock, flags); |
1233 | } | |
f43dc23d PM |
1234 | } |
1235 | ||
b96408b4 UH |
1236 | static void start_hrtimer_us(struct hrtimer *hrt, unsigned long usec) |
1237 | { | |
1238 | long sec = usec / 1000000; | |
1239 | long nsec = (usec % 1000000) * 1000; | |
1240 | ktime_t t = ktime_set(sec, nsec); | |
1241 | ||
1242 | hrtimer_start(hrt, t, HRTIMER_MODE_REL); | |
1243 | } | |
1244 | ||
e1910fcd | 1245 | static void sci_dma_rx_complete(void *arg) |
1da177e4 | 1246 | { |
e1910fcd | 1247 | struct sci_port *s = arg; |
1d3db608 | 1248 | struct dma_chan *chan = s->chan_rx; |
e1910fcd | 1249 | struct uart_port *port = &s->port; |
67f462b0 | 1250 | struct dma_async_tx_descriptor *desc; |
e1910fcd GU |
1251 | unsigned long flags; |
1252 | int active, count = 0; | |
1da177e4 | 1253 | |
e1910fcd GU |
1254 | dev_dbg(port->dev, "%s(%d) active cookie %d\n", __func__, port->line, |
1255 | s->active_rx); | |
cb772fe7 | 1256 | |
e1910fcd | 1257 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 1258 | |
e1910fcd GU |
1259 | active = sci_dma_rx_find_active(s); |
1260 | if (active >= 0) | |
1261 | count = sci_dma_rx_push(s, s->rx_buf[active], s->buf_len_rx); | |
f43dc23d | 1262 | |
b96408b4 | 1263 | start_hrtimer_us(&s->rx_timer, s->rx_timeout); |
f43dc23d | 1264 | |
e1910fcd GU |
1265 | if (count) |
1266 | tty_flip_buffer_push(&port->state->port); | |
8b6ff84c | 1267 | |
67f462b0 GU |
1268 | desc = dmaengine_prep_slave_sg(s->chan_rx, &s->sg_rx[active], 1, |
1269 | DMA_DEV_TO_MEM, | |
1270 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1271 | if (!desc) | |
1272 | goto fail; | |
1273 | ||
1274 | desc->callback = sci_dma_rx_complete; | |
1275 | desc->callback_param = s; | |
1276 | s->cookie_rx[active] = dmaengine_submit(desc); | |
1277 | if (dma_submit_error(s->cookie_rx[active])) | |
1278 | goto fail; | |
1279 | ||
1280 | s->active_rx = s->cookie_rx[!active]; | |
1281 | ||
1d3db608 MHF |
1282 | dma_async_issue_pending(chan); |
1283 | ||
6fc5a520 | 1284 | spin_unlock_irqrestore(&port->lock, flags); |
67f462b0 GU |
1285 | dev_dbg(port->dev, "%s: cookie %d #%d, new active cookie %d\n", |
1286 | __func__, s->cookie_rx[active], active, s->active_rx); | |
67f462b0 GU |
1287 | return; |
1288 | ||
1289 | fail: | |
1290 | spin_unlock_irqrestore(&port->lock, flags); | |
1291 | dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n"); | |
1292 | sci_rx_dma_release(s, true); | |
1da177e4 LT |
1293 | } |
1294 | ||
e1910fcd | 1295 | static void sci_tx_dma_release(struct sci_port *s, bool enable_pio) |
1da177e4 | 1296 | { |
e1910fcd GU |
1297 | struct dma_chan *chan = s->chan_tx; |
1298 | struct uart_port *port = &s->port; | |
e552de24 | 1299 | unsigned long flags; |
1da177e4 | 1300 | |
e1910fcd GU |
1301 | spin_lock_irqsave(&port->lock, flags); |
1302 | s->chan_tx = NULL; | |
1303 | s->cookie_tx = -EINVAL; | |
1304 | spin_unlock_irqrestore(&port->lock, flags); | |
1305 | dmaengine_terminate_all(chan); | |
1306 | dma_unmap_single(chan->device->dev, s->tx_dma_addr, UART_XMIT_SIZE, | |
1307 | DMA_TO_DEVICE); | |
1308 | dma_release_channel(chan); | |
1be22663 TA |
1309 | if (enable_pio) { |
1310 | spin_lock_irqsave(&port->lock, flags); | |
e1910fcd | 1311 | sci_start_tx(port); |
1be22663 TA |
1312 | spin_unlock_irqrestore(&port->lock, flags); |
1313 | } | |
e1910fcd | 1314 | } |
d535a230 | 1315 | |
e1910fcd GU |
1316 | static void sci_submit_rx(struct sci_port *s) |
1317 | { | |
1318 | struct dma_chan *chan = s->chan_rx; | |
1319 | int i; | |
073e84c9 | 1320 | |
e1910fcd GU |
1321 | for (i = 0; i < 2; i++) { |
1322 | struct scatterlist *sg = &s->sg_rx[i]; | |
1323 | struct dma_async_tx_descriptor *desc; | |
1da177e4 | 1324 | |
e1910fcd GU |
1325 | desc = dmaengine_prep_slave_sg(chan, |
1326 | sg, 1, DMA_DEV_TO_MEM, | |
1327 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1328 | if (!desc) | |
1329 | goto fail; | |
501b825d | 1330 | |
e1910fcd GU |
1331 | desc->callback = sci_dma_rx_complete; |
1332 | desc->callback_param = s; | |
1333 | s->cookie_rx[i] = dmaengine_submit(desc); | |
1334 | if (dma_submit_error(s->cookie_rx[i])) | |
1335 | goto fail; | |
9174fc8f | 1336 | |
e1910fcd | 1337 | } |
9174fc8f | 1338 | |
e1910fcd | 1339 | s->active_rx = s->cookie_rx[0]; |
9174fc8f | 1340 | |
e1910fcd GU |
1341 | dma_async_issue_pending(chan); |
1342 | return; | |
9174fc8f | 1343 | |
e1910fcd GU |
1344 | fail: |
1345 | if (i) | |
1346 | dmaengine_terminate_all(chan); | |
1347 | for (i = 0; i < 2; i++) | |
1348 | s->cookie_rx[i] = -EINVAL; | |
1349 | s->active_rx = -EINVAL; | |
e1910fcd GU |
1350 | sci_rx_dma_release(s, true); |
1351 | } | |
9174fc8f | 1352 | |
e1910fcd | 1353 | static void work_fn_tx(struct work_struct *work) |
1da177e4 | 1354 | { |
e1910fcd GU |
1355 | struct sci_port *s = container_of(work, struct sci_port, work_tx); |
1356 | struct dma_async_tx_descriptor *desc; | |
1357 | struct dma_chan *chan = s->chan_tx; | |
1358 | struct uart_port *port = &s->port; | |
1359 | struct circ_buf *xmit = &port->state->xmit; | |
1360 | dma_addr_t buf; | |
1da177e4 | 1361 | |
9174fc8f | 1362 | /* |
e1910fcd GU |
1363 | * DMA is idle now. |
1364 | * Port xmit buffer is already mapped, and it is one page... Just adjust | |
1365 | * offsets and lengths. Since it is a circular buffer, we have to | |
1366 | * transmit till the end, and then the rest. Take the port lock to get a | |
1367 | * consistent xmit buffer state. | |
9174fc8f | 1368 | */ |
e1910fcd GU |
1369 | spin_lock_irq(&port->lock); |
1370 | buf = s->tx_dma_addr + (xmit->tail & (UART_XMIT_SIZE - 1)); | |
1371 | s->tx_dma_len = min_t(unsigned int, | |
1372 | CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE), | |
1373 | CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE)); | |
1374 | spin_unlock_irq(&port->lock); | |
0e8963de | 1375 | |
e1910fcd GU |
1376 | desc = dmaengine_prep_slave_single(chan, buf, s->tx_dma_len, |
1377 | DMA_MEM_TO_DEV, | |
1378 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1379 | if (!desc) { | |
1380 | dev_warn(port->dev, "Failed preparing Tx DMA descriptor\n"); | |
1381 | /* switch to PIO */ | |
1382 | sci_tx_dma_release(s, true); | |
1383 | return; | |
1384 | } | |
0e8963de | 1385 | |
e1910fcd GU |
1386 | dma_sync_single_for_device(chan->device->dev, buf, s->tx_dma_len, |
1387 | DMA_TO_DEVICE); | |
1da177e4 | 1388 | |
e1910fcd GU |
1389 | spin_lock_irq(&port->lock); |
1390 | desc->callback = sci_dma_tx_complete; | |
1391 | desc->callback_param = s; | |
1392 | spin_unlock_irq(&port->lock); | |
1393 | s->cookie_tx = dmaengine_submit(desc); | |
1394 | if (dma_submit_error(s->cookie_tx)) { | |
1395 | dev_warn(port->dev, "Failed submitting Tx DMA descriptor\n"); | |
1396 | /* switch to PIO */ | |
1397 | sci_tx_dma_release(s, true); | |
1398 | return; | |
1da177e4 | 1399 | } |
1da177e4 | 1400 | |
e1910fcd GU |
1401 | dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", |
1402 | __func__, xmit->buf, xmit->tail, xmit->head, s->cookie_tx); | |
73a19e4c | 1403 | |
e1910fcd | 1404 | dma_async_issue_pending(chan); |
1da177e4 LT |
1405 | } |
1406 | ||
b96408b4 | 1407 | static enum hrtimer_restart rx_timer_fn(struct hrtimer *t) |
1da177e4 | 1408 | { |
b96408b4 | 1409 | struct sci_port *s = container_of(t, struct sci_port, rx_timer); |
e7327c09 | 1410 | struct dma_chan *chan = s->chan_rx; |
e1910fcd | 1411 | struct uart_port *port = &s->port; |
67f462b0 GU |
1412 | struct dma_tx_state state; |
1413 | enum dma_status status; | |
1414 | unsigned long flags; | |
1415 | unsigned int read; | |
1416 | int active, count; | |
1417 | u16 scr; | |
1418 | ||
67f462b0 | 1419 | dev_dbg(port->dev, "DMA Rx timed out\n"); |
67f462b0 | 1420 | |
6fc5a520 TA |
1421 | spin_lock_irqsave(&port->lock, flags); |
1422 | ||
67f462b0 GU |
1423 | active = sci_dma_rx_find_active(s); |
1424 | if (active < 0) { | |
1425 | spin_unlock_irqrestore(&port->lock, flags); | |
b96408b4 | 1426 | return HRTIMER_NORESTART; |
67f462b0 GU |
1427 | } |
1428 | ||
1429 | status = dmaengine_tx_status(s->chan_rx, s->active_rx, &state); | |
3b963042 | 1430 | if (status == DMA_COMPLETE) { |
6fc5a520 | 1431 | spin_unlock_irqrestore(&port->lock, flags); |
67f462b0 GU |
1432 | dev_dbg(port->dev, "Cookie %d #%d has already completed\n", |
1433 | s->active_rx, active); | |
3b963042 MHF |
1434 | |
1435 | /* Let packet complete handler take care of the packet */ | |
b96408b4 | 1436 | return HRTIMER_NORESTART; |
3b963042 | 1437 | } |
67f462b0 | 1438 | |
e7327c09 MHF |
1439 | dmaengine_pause(chan); |
1440 | ||
1441 | /* | |
1442 | * sometimes DMA transfer doesn't stop even if it is stopped and | |
1443 | * data keeps on coming until transaction is complete so check | |
1444 | * for DMA_COMPLETE again | |
1445 | * Let packet complete handler take care of the packet | |
1446 | */ | |
1447 | status = dmaengine_tx_status(s->chan_rx, s->active_rx, &state); | |
1448 | if (status == DMA_COMPLETE) { | |
1449 | spin_unlock_irqrestore(&port->lock, flags); | |
1450 | dev_dbg(port->dev, "Transaction complete after DMA engine was stopped"); | |
b96408b4 | 1451 | return HRTIMER_NORESTART; |
e7327c09 MHF |
1452 | } |
1453 | ||
67f462b0 GU |
1454 | /* Handle incomplete DMA receive */ |
1455 | dmaengine_terminate_all(s->chan_rx); | |
1456 | read = sg_dma_len(&s->sg_rx[active]) - state.residue; | |
67f462b0 GU |
1457 | |
1458 | if (read) { | |
1459 | count = sci_dma_rx_push(s, s->rx_buf[active], read); | |
1460 | if (count) | |
1461 | tty_flip_buffer_push(&port->state->port); | |
1462 | } | |
1463 | ||
756981be GU |
1464 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
1465 | sci_submit_rx(s); | |
371cfed3 MHF |
1466 | |
1467 | /* Direct new serial port interrupts back to CPU */ | |
1468 | scr = serial_port_in(port, SCSCR); | |
1469 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1470 | scr &= ~SCSCR_RDRQE; | |
1471 | enable_irq(s->irqs[SCIx_RXI_IRQ]); | |
1472 | } | |
1473 | serial_port_out(port, SCSCR, scr | SCSCR_RIE); | |
1474 | ||
1475 | spin_unlock_irqrestore(&port->lock, flags); | |
b96408b4 UH |
1476 | |
1477 | return HRTIMER_NORESTART; | |
1da177e4 LT |
1478 | } |
1479 | ||
ff441129 | 1480 | static struct dma_chan *sci_request_dma_chan(struct uart_port *port, |
219fb0c1 | 1481 | enum dma_transfer_direction dir) |
ff441129 | 1482 | { |
ff441129 GU |
1483 | struct dma_chan *chan; |
1484 | struct dma_slave_config cfg; | |
1485 | int ret; | |
1486 | ||
219fb0c1 LP |
1487 | chan = dma_request_slave_channel(port->dev, |
1488 | dir == DMA_MEM_TO_DEV ? "tx" : "rx"); | |
ff441129 | 1489 | if (!chan) { |
9b7becf1 | 1490 | dev_warn(port->dev, "dma_request_slave_channel failed\n"); |
ff441129 GU |
1491 | return NULL; |
1492 | } | |
1493 | ||
1494 | memset(&cfg, 0, sizeof(cfg)); | |
1495 | cfg.direction = dir; | |
1496 | if (dir == DMA_MEM_TO_DEV) { | |
1497 | cfg.dst_addr = port->mapbase + | |
1498 | (sci_getreg(port, SCxTDR)->offset << port->regshift); | |
1499 | cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
1500 | } else { | |
1501 | cfg.src_addr = port->mapbase + | |
1502 | (sci_getreg(port, SCxRDR)->offset << port->regshift); | |
1503 | cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
1504 | } | |
1505 | ||
1506 | ret = dmaengine_slave_config(chan, &cfg); | |
1507 | if (ret) { | |
1508 | dev_warn(port->dev, "dmaengine_slave_config failed %d\n", ret); | |
1509 | dma_release_channel(chan); | |
1510 | return NULL; | |
1511 | } | |
1512 | ||
1513 | return chan; | |
1514 | } | |
1515 | ||
e1910fcd | 1516 | static void sci_request_dma(struct uart_port *port) |
73a19e4c | 1517 | { |
e1910fcd | 1518 | struct sci_port *s = to_sci_port(port); |
e1910fcd | 1519 | struct dma_chan *chan; |
73a19e4c | 1520 | |
e1910fcd | 1521 | dev_dbg(port->dev, "%s: port %d\n", __func__, port->line); |
73a19e4c | 1522 | |
219fb0c1 | 1523 | if (!port->dev->of_node) |
e1910fcd | 1524 | return; |
73a19e4c | 1525 | |
e1910fcd | 1526 | s->cookie_tx = -EINVAL; |
7464779f AL |
1527 | |
1528 | /* | |
1529 | * Don't request a dma channel if no channel was specified | |
1530 | * in the device tree. | |
1531 | */ | |
1532 | if (!of_find_property(port->dev->of_node, "dmas", NULL)) | |
1533 | return; | |
1534 | ||
219fb0c1 | 1535 | chan = sci_request_dma_chan(port, DMA_MEM_TO_DEV); |
e1910fcd GU |
1536 | dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan); |
1537 | if (chan) { | |
1538 | s->chan_tx = chan; | |
1539 | /* UART circular tx buffer is an aligned page. */ | |
1540 | s->tx_dma_addr = dma_map_single(chan->device->dev, | |
1541 | port->state->xmit.buf, | |
1542 | UART_XMIT_SIZE, | |
1543 | DMA_TO_DEVICE); | |
1544 | if (dma_mapping_error(chan->device->dev, s->tx_dma_addr)) { | |
1545 | dev_warn(port->dev, "Failed mapping Tx DMA descriptor\n"); | |
1546 | dma_release_channel(chan); | |
1547 | s->chan_tx = NULL; | |
1548 | } else { | |
1549 | dev_dbg(port->dev, "%s: mapped %lu@%p to %pad\n", | |
1550 | __func__, UART_XMIT_SIZE, | |
1551 | port->state->xmit.buf, &s->tx_dma_addr); | |
49d4bcad | 1552 | } |
e1910fcd GU |
1553 | |
1554 | INIT_WORK(&s->work_tx, work_fn_tx); | |
3089f381 GL |
1555 | } |
1556 | ||
219fb0c1 | 1557 | chan = sci_request_dma_chan(port, DMA_DEV_TO_MEM); |
e1910fcd GU |
1558 | dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan); |
1559 | if (chan) { | |
1560 | unsigned int i; | |
1561 | dma_addr_t dma; | |
1562 | void *buf; | |
73a19e4c | 1563 | |
e1910fcd | 1564 | s->chan_rx = chan; |
73a19e4c | 1565 | |
e1910fcd GU |
1566 | s->buf_len_rx = 2 * max_t(size_t, 16, port->fifosize); |
1567 | buf = dma_alloc_coherent(chan->device->dev, s->buf_len_rx * 2, | |
1568 | &dma, GFP_KERNEL); | |
1569 | if (!buf) { | |
1570 | dev_warn(port->dev, | |
1571 | "Failed to allocate Rx dma buffer, using PIO\n"); | |
1572 | dma_release_channel(chan); | |
1573 | s->chan_rx = NULL; | |
e1910fcd GU |
1574 | return; |
1575 | } | |
73a19e4c | 1576 | |
e1910fcd GU |
1577 | for (i = 0; i < 2; i++) { |
1578 | struct scatterlist *sg = &s->sg_rx[i]; | |
0533502d | 1579 | |
e1910fcd GU |
1580 | sg_init_table(sg, 1); |
1581 | s->rx_buf[i] = buf; | |
1582 | sg_dma_address(sg) = dma; | |
d09959e7 | 1583 | sg_dma_len(sg) = s->buf_len_rx; |
0533502d | 1584 | |
e1910fcd GU |
1585 | buf += s->buf_len_rx; |
1586 | dma += s->buf_len_rx; | |
1587 | } | |
1588 | ||
b96408b4 UH |
1589 | hrtimer_init(&s->rx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1590 | s->rx_timer.function = rx_timer_fn; | |
e1910fcd | 1591 | |
756981be GU |
1592 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
1593 | sci_submit_rx(s); | |
e1910fcd | 1594 | } |
0533502d GU |
1595 | } |
1596 | ||
e1910fcd | 1597 | static void sci_free_dma(struct uart_port *port) |
73a19e4c | 1598 | { |
e1910fcd | 1599 | struct sci_port *s = to_sci_port(port); |
73a19e4c | 1600 | |
e1910fcd GU |
1601 | if (s->chan_tx) |
1602 | sci_tx_dma_release(s, false); | |
1603 | if (s->chan_rx) | |
1604 | sci_rx_dma_release(s, false); | |
1605 | } | |
1cf4a7ef GU |
1606 | |
1607 | static void sci_flush_buffer(struct uart_port *port) | |
1608 | { | |
1609 | /* | |
1610 | * In uart_flush_buffer(), the xmit circular buffer has just been | |
1611 | * cleared, so we have to reset tx_dma_len accordingly. | |
1612 | */ | |
1613 | to_sci_port(port)->tx_dma_len = 0; | |
1614 | } | |
1615 | #else /* !CONFIG_SERIAL_SH_SCI_DMA */ | |
e1910fcd GU |
1616 | static inline void sci_request_dma(struct uart_port *port) |
1617 | { | |
1618 | } | |
73a19e4c | 1619 | |
e1910fcd GU |
1620 | static inline void sci_free_dma(struct uart_port *port) |
1621 | { | |
1622 | } | |
1cf4a7ef GU |
1623 | |
1624 | #define sci_flush_buffer NULL | |
1625 | #endif /* !CONFIG_SERIAL_SH_SCI_DMA */ | |
73a19e4c | 1626 | |
e1910fcd GU |
1627 | static irqreturn_t sci_rx_interrupt(int irq, void *ptr) |
1628 | { | |
e1910fcd GU |
1629 | struct uart_port *port = ptr; |
1630 | struct sci_port *s = to_sci_port(port); | |
73a19e4c | 1631 | |
03940376 | 1632 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
e1910fcd GU |
1633 | if (s->chan_rx) { |
1634 | u16 scr = serial_port_in(port, SCSCR); | |
1635 | u16 ssr = serial_port_in(port, SCxSR); | |
73a19e4c | 1636 | |
e1910fcd GU |
1637 | /* Disable future Rx interrupts */ |
1638 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1639 | disable_irq_nosync(irq); | |
1640 | scr |= SCSCR_RDRQE; | |
1641 | } else { | |
1642 | scr &= ~SCSCR_RIE; | |
756981be | 1643 | sci_submit_rx(s); |
e1910fcd GU |
1644 | } |
1645 | serial_port_out(port, SCSCR, scr); | |
1646 | /* Clear current interrupt */ | |
1647 | serial_port_out(port, SCxSR, | |
1648 | ssr & ~(SCIF_DR | SCxSR_RDxF(port))); | |
b96408b4 | 1649 | dev_dbg(port->dev, "Rx IRQ %lu: setup t-out in %u us\n", |
e1910fcd | 1650 | jiffies, s->rx_timeout); |
b96408b4 | 1651 | start_hrtimer_us(&s->rx_timer, s->rx_timeout); |
73a19e4c | 1652 | |
e1910fcd GU |
1653 | return IRQ_HANDLED; |
1654 | } | |
1655 | #endif | |
73a19e4c | 1656 | |
03940376 UH |
1657 | if (s->rx_trigger > 1 && s->rx_fifo_timeout > 0) { |
1658 | if (!scif_rtrg_enabled(port)) | |
1659 | scif_set_rtrg(port, s->rx_trigger); | |
1660 | ||
1661 | mod_timer(&s->rx_fifo_timer, jiffies + DIV_ROUND_UP( | |
b96408b4 | 1662 | s->rx_frame * HZ * s->rx_fifo_timeout, 1000000)); |
03940376 UH |
1663 | } |
1664 | ||
e1910fcd GU |
1665 | /* I think sci_receive_chars has to be called irrespective |
1666 | * of whether the I_IXOFF is set, otherwise, how is the interrupt | |
1667 | * to be disabled? | |
1668 | */ | |
1669 | sci_receive_chars(ptr); | |
1670 | ||
1671 | return IRQ_HANDLED; | |
73a19e4c GL |
1672 | } |
1673 | ||
e1910fcd | 1674 | static irqreturn_t sci_tx_interrupt(int irq, void *ptr) |
73a19e4c | 1675 | { |
e1910fcd | 1676 | struct uart_port *port = ptr; |
04928b79 | 1677 | unsigned long flags; |
73a19e4c | 1678 | |
04928b79 | 1679 | spin_lock_irqsave(&port->lock, flags); |
e1910fcd | 1680 | sci_transmit_chars(port); |
04928b79 | 1681 | spin_unlock_irqrestore(&port->lock, flags); |
e1910fcd GU |
1682 | |
1683 | return IRQ_HANDLED; | |
73a19e4c GL |
1684 | } |
1685 | ||
e1910fcd | 1686 | static irqreturn_t sci_er_interrupt(int irq, void *ptr) |
73a19e4c | 1687 | { |
e1910fcd GU |
1688 | struct uart_port *port = ptr; |
1689 | struct sci_port *s = to_sci_port(port); | |
73a19e4c | 1690 | |
e1910fcd GU |
1691 | /* Handle errors */ |
1692 | if (port->type == PORT_SCI) { | |
1693 | if (sci_handle_errors(port)) { | |
1694 | /* discard character in rx buffer */ | |
1695 | serial_port_in(port, SCxSR); | |
1696 | sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port)); | |
1697 | } | |
1698 | } else { | |
1699 | sci_handle_fifo_overrun(port); | |
1700 | if (!s->chan_rx) | |
1701 | sci_receive_chars(ptr); | |
1702 | } | |
1703 | ||
1704 | sci_clear_SCxSR(port, SCxSR_ERROR_CLEAR(port)); | |
1705 | ||
1706 | /* Kick the transmission */ | |
1707 | if (!s->chan_tx) | |
1708 | sci_tx_interrupt(irq, ptr); | |
1709 | ||
1710 | return IRQ_HANDLED; | |
73a19e4c GL |
1711 | } |
1712 | ||
e1910fcd | 1713 | static irqreturn_t sci_br_interrupt(int irq, void *ptr) |
73a19e4c | 1714 | { |
e1910fcd | 1715 | struct uart_port *port = ptr; |
73a19e4c | 1716 | |
e1910fcd GU |
1717 | /* Handle BREAKs */ |
1718 | sci_handle_breaks(port); | |
1719 | sci_clear_SCxSR(port, SCxSR_BREAK_CLEAR(port)); | |
73a19e4c | 1720 | |
e1910fcd GU |
1721 | return IRQ_HANDLED; |
1722 | } | |
73a19e4c | 1723 | |
e1910fcd GU |
1724 | static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) |
1725 | { | |
1726 | unsigned short ssr_status, scr_status, err_enabled, orer_status = 0; | |
1727 | struct uart_port *port = ptr; | |
1728 | struct sci_port *s = to_sci_port(port); | |
1729 | irqreturn_t ret = IRQ_NONE; | |
73a19e4c | 1730 | |
e1910fcd GU |
1731 | ssr_status = serial_port_in(port, SCxSR); |
1732 | scr_status = serial_port_in(port, SCSCR); | |
b2f20ed9 | 1733 | if (s->params->overrun_reg == SCxSR) |
e1910fcd | 1734 | orer_status = ssr_status; |
b2f20ed9 LP |
1735 | else if (sci_getreg(port, s->params->overrun_reg)->size) |
1736 | orer_status = serial_port_in(port, s->params->overrun_reg); | |
73a19e4c | 1737 | |
e1910fcd | 1738 | err_enabled = scr_status & port_rx_irq_mask(port); |
73a19e4c | 1739 | |
e1910fcd GU |
1740 | /* Tx Interrupt */ |
1741 | if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCSCR_TIE) && | |
1742 | !s->chan_tx) | |
1743 | ret = sci_tx_interrupt(irq, ptr); | |
658daa95 | 1744 | |
e1910fcd GU |
1745 | /* |
1746 | * Rx Interrupt: if we're using DMA, the DMA controller clears RDF / | |
1747 | * DR flags | |
1748 | */ | |
1749 | if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) && | |
1750 | (scr_status & SCSCR_RIE)) | |
1751 | ret = sci_rx_interrupt(irq, ptr); | |
73a19e4c | 1752 | |
e1910fcd GU |
1753 | /* Error Interrupt */ |
1754 | if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled) | |
1755 | ret = sci_er_interrupt(irq, ptr); | |
73a19e4c | 1756 | |
e1910fcd GU |
1757 | /* Break Interrupt */ |
1758 | if ((ssr_status & SCxSR_BRK(port)) && err_enabled) | |
1759 | ret = sci_br_interrupt(irq, ptr); | |
1760 | ||
1761 | /* Overrun Interrupt */ | |
b2f20ed9 | 1762 | if (orer_status & s->params->overrun_mask) { |
e1910fcd GU |
1763 | sci_handle_fifo_overrun(port); |
1764 | ret = IRQ_HANDLED; | |
73a19e4c | 1765 | } |
73a19e4c | 1766 | |
e1910fcd GU |
1767 | return ret; |
1768 | } | |
73a19e4c | 1769 | |
e1910fcd GU |
1770 | static const struct sci_irq_desc { |
1771 | const char *desc; | |
1772 | irq_handler_t handler; | |
1773 | } sci_irq_desc[] = { | |
1774 | /* | |
1775 | * Split out handlers, the default case. | |
1776 | */ | |
1777 | [SCIx_ERI_IRQ] = { | |
1778 | .desc = "rx err", | |
1779 | .handler = sci_er_interrupt, | |
1780 | }, | |
3089f381 | 1781 | |
e1910fcd GU |
1782 | [SCIx_RXI_IRQ] = { |
1783 | .desc = "rx full", | |
1784 | .handler = sci_rx_interrupt, | |
1785 | }, | |
47aceb92 | 1786 | |
e1910fcd GU |
1787 | [SCIx_TXI_IRQ] = { |
1788 | .desc = "tx empty", | |
1789 | .handler = sci_tx_interrupt, | |
1790 | }, | |
73a19e4c | 1791 | |
e1910fcd GU |
1792 | [SCIx_BRI_IRQ] = { |
1793 | .desc = "break", | |
1794 | .handler = sci_br_interrupt, | |
1795 | }, | |
73a19e4c GL |
1796 | |
1797 | /* | |
e1910fcd | 1798 | * Special muxed handler. |
73a19e4c | 1799 | */ |
e1910fcd GU |
1800 | [SCIx_MUX_IRQ] = { |
1801 | .desc = "mux", | |
1802 | .handler = sci_mpxed_interrupt, | |
1803 | }, | |
1804 | }; | |
73a19e4c | 1805 | |
e1910fcd GU |
1806 | static int sci_request_irq(struct sci_port *port) |
1807 | { | |
1808 | struct uart_port *up = &port->port; | |
1809 | int i, j, ret = 0; | |
73a19e4c | 1810 | |
e1910fcd GU |
1811 | for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) { |
1812 | const struct sci_irq_desc *desc; | |
1813 | int irq; | |
73a19e4c | 1814 | |
e1910fcd GU |
1815 | if (SCIx_IRQ_IS_MUXED(port)) { |
1816 | i = SCIx_MUX_IRQ; | |
1817 | irq = up->irq; | |
1818 | } else { | |
1819 | irq = port->irqs[i]; | |
1820 | ||
1821 | /* | |
1822 | * Certain port types won't support all of the | |
1823 | * available interrupt sources. | |
1824 | */ | |
1825 | if (unlikely(irq < 0)) | |
1826 | continue; | |
1827 | } | |
1828 | ||
1829 | desc = sci_irq_desc + i; | |
1830 | port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s", | |
1831 | dev_name(up->dev), desc->desc); | |
623ac1d4 PB |
1832 | if (!port->irqstr[j]) { |
1833 | ret = -ENOMEM; | |
e1910fcd | 1834 | goto out_nomem; |
623ac1d4 | 1835 | } |
e1910fcd GU |
1836 | |
1837 | ret = request_irq(irq, desc->handler, up->irqflags, | |
1838 | port->irqstr[j], port); | |
1839 | if (unlikely(ret)) { | |
1840 | dev_err(up->dev, "Can't allocate %s IRQ\n", desc->desc); | |
1841 | goto out_noirq; | |
1842 | } | |
73a19e4c GL |
1843 | } |
1844 | ||
e1910fcd | 1845 | return 0; |
1da177e4 | 1846 | |
e1910fcd GU |
1847 | out_noirq: |
1848 | while (--i >= 0) | |
1849 | free_irq(port->irqs[i], port); | |
f43dc23d | 1850 | |
e1910fcd GU |
1851 | out_nomem: |
1852 | while (--j >= 0) | |
1853 | kfree(port->irqstr[j]); | |
f43dc23d | 1854 | |
e1910fcd | 1855 | return ret; |
1da177e4 LT |
1856 | } |
1857 | ||
e1910fcd | 1858 | static void sci_free_irq(struct sci_port *port) |
1da177e4 | 1859 | { |
e1910fcd | 1860 | int i; |
1da177e4 | 1861 | |
e1910fcd GU |
1862 | /* |
1863 | * Intentionally in reverse order so we iterate over the muxed | |
1864 | * IRQ first. | |
1865 | */ | |
1866 | for (i = 0; i < SCIx_NR_IRQS; i++) { | |
1867 | int irq = port->irqs[i]; | |
f43dc23d | 1868 | |
e1910fcd GU |
1869 | /* |
1870 | * Certain port types won't support all of the available | |
1871 | * interrupt sources. | |
1872 | */ | |
1873 | if (unlikely(irq < 0)) | |
1874 | continue; | |
f43dc23d | 1875 | |
e1910fcd GU |
1876 | free_irq(port->irqs[i], port); |
1877 | kfree(port->irqstr[i]); | |
f43dc23d | 1878 | |
e1910fcd GU |
1879 | if (SCIx_IRQ_IS_MUXED(port)) { |
1880 | /* If there's only one IRQ, we're done. */ | |
1881 | return; | |
1882 | } | |
1883 | } | |
1da177e4 LT |
1884 | } |
1885 | ||
e1910fcd | 1886 | static unsigned int sci_tx_empty(struct uart_port *port) |
1da177e4 | 1887 | { |
e1910fcd GU |
1888 | unsigned short status = serial_port_in(port, SCxSR); |
1889 | unsigned short in_tx_fifo = sci_txfill(port); | |
f43dc23d | 1890 | |
e1910fcd | 1891 | return (status & SCxSR_TEND(port)) && !in_tx_fifo ? TIOCSER_TEMT : 0; |
1da177e4 LT |
1892 | } |
1893 | ||
33f50ffc GU |
1894 | static void sci_set_rts(struct uart_port *port, bool state) |
1895 | { | |
1896 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1897 | u16 data = serial_port_in(port, SCPDR); | |
1898 | ||
1899 | /* Active low */ | |
1900 | if (state) | |
1901 | data &= ~SCPDR_RTSD; | |
1902 | else | |
1903 | data |= SCPDR_RTSD; | |
1904 | serial_port_out(port, SCPDR, data); | |
1905 | ||
1906 | /* RTS# is output */ | |
1907 | serial_port_out(port, SCPCR, | |
1908 | serial_port_in(port, SCPCR) | SCPCR_RTSC); | |
1909 | } else if (sci_getreg(port, SCSPTR)->size) { | |
1910 | u16 ctrl = serial_port_in(port, SCSPTR); | |
1911 | ||
1912 | /* Active low */ | |
1913 | if (state) | |
1914 | ctrl &= ~SCSPTR_RTSDT; | |
1915 | else | |
1916 | ctrl |= SCSPTR_RTSDT; | |
1917 | serial_port_out(port, SCSPTR, ctrl); | |
1918 | } | |
1919 | } | |
1920 | ||
1921 | static bool sci_get_cts(struct uart_port *port) | |
1922 | { | |
1923 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1924 | /* Active low */ | |
1925 | return !(serial_port_in(port, SCPDR) & SCPDR_CTSD); | |
1926 | } else if (sci_getreg(port, SCSPTR)->size) { | |
1927 | /* Active low */ | |
1928 | return !(serial_port_in(port, SCSPTR) & SCSPTR_CTSDT); | |
1929 | } | |
1930 | ||
1931 | return true; | |
1932 | } | |
1933 | ||
e1910fcd GU |
1934 | /* |
1935 | * Modem control is a bit of a mixed bag for SCI(F) ports. Generally | |
1936 | * CTS/RTS is supported in hardware by at least one port and controlled | |
1937 | * via SCSPTR (SCxPCR for SCIFA/B parts), or external pins (presently | |
1938 | * handled via the ->init_pins() op, which is a bit of a one-way street, | |
1939 | * lacking any ability to defer pin control -- this will later be | |
1940 | * converted over to the GPIO framework). | |
1941 | * | |
1942 | * Other modes (such as loopback) are supported generically on certain | |
1943 | * port types, but not others. For these it's sufficient to test for the | |
1944 | * existence of the support register and simply ignore the port type. | |
1945 | */ | |
1946 | static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
1da177e4 | 1947 | { |
f907c9ea GU |
1948 | struct sci_port *s = to_sci_port(port); |
1949 | ||
e1910fcd GU |
1950 | if (mctrl & TIOCM_LOOP) { |
1951 | const struct plat_sci_reg *reg; | |
f43dc23d | 1952 | |
e1910fcd GU |
1953 | /* |
1954 | * Standard loopback mode for SCFCR ports. | |
1955 | */ | |
1956 | reg = sci_getreg(port, SCFCR); | |
1957 | if (reg->size) | |
1958 | serial_port_out(port, SCFCR, | |
1959 | serial_port_in(port, SCFCR) | | |
1960 | SCFCR_LOOP); | |
1961 | } | |
f907c9ea GU |
1962 | |
1963 | mctrl_gpio_set(s->gpios, mctrl); | |
33f50ffc | 1964 | |
97ed9790 | 1965 | if (!s->has_rtscts) |
33f50ffc GU |
1966 | return; |
1967 | ||
1968 | if (!(mctrl & TIOCM_RTS)) { | |
1969 | /* Disable Auto RTS */ | |
1970 | serial_port_out(port, SCFCR, | |
1971 | serial_port_in(port, SCFCR) & ~SCFCR_MCE); | |
1972 | ||
1973 | /* Clear RTS */ | |
1974 | sci_set_rts(port, 0); | |
1975 | } else if (s->autorts) { | |
1976 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { | |
1977 | /* Enable RTS# pin function */ | |
1978 | serial_port_out(port, SCPCR, | |
1979 | serial_port_in(port, SCPCR) & ~SCPCR_RTSC); | |
1980 | } | |
1981 | ||
1982 | /* Enable Auto RTS */ | |
1983 | serial_port_out(port, SCFCR, | |
1984 | serial_port_in(port, SCFCR) | SCFCR_MCE); | |
1985 | } else { | |
1986 | /* Set RTS */ | |
1987 | sci_set_rts(port, 1); | |
1988 | } | |
e1910fcd | 1989 | } |
f43dc23d | 1990 | |
e1910fcd GU |
1991 | static unsigned int sci_get_mctrl(struct uart_port *port) |
1992 | { | |
f907c9ea GU |
1993 | struct sci_port *s = to_sci_port(port); |
1994 | struct mctrl_gpios *gpios = s->gpios; | |
1995 | unsigned int mctrl = 0; | |
1996 | ||
1997 | mctrl_gpio_get(gpios, &mctrl); | |
1998 | ||
e1910fcd GU |
1999 | /* |
2000 | * CTS/RTS is handled in hardware when supported, while nothing | |
33f50ffc | 2001 | * else is wired up. |
e1910fcd | 2002 | */ |
33f50ffc GU |
2003 | if (s->autorts) { |
2004 | if (sci_get_cts(port)) | |
2005 | mctrl |= TIOCM_CTS; | |
2006 | } else if (IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(gpios, UART_GPIO_CTS))) { | |
f907c9ea | 2007 | mctrl |= TIOCM_CTS; |
33f50ffc | 2008 | } |
f907c9ea GU |
2009 | if (IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(gpios, UART_GPIO_DSR))) |
2010 | mctrl |= TIOCM_DSR; | |
2011 | if (IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(gpios, UART_GPIO_DCD))) | |
2012 | mctrl |= TIOCM_CAR; | |
2013 | ||
2014 | return mctrl; | |
2015 | } | |
2016 | ||
2017 | static void sci_enable_ms(struct uart_port *port) | |
2018 | { | |
2019 | mctrl_gpio_enable_ms(to_sci_port(port)->gpios); | |
1da177e4 LT |
2020 | } |
2021 | ||
1da177e4 LT |
2022 | static void sci_break_ctl(struct uart_port *port, int break_state) |
2023 | { | |
bbb4ce50 | 2024 | unsigned short scscr, scsptr; |
1be22663 | 2025 | unsigned long flags; |
bbb4ce50 | 2026 | |
a4e02f6d | 2027 | /* check wheter the port has SCSPTR */ |
abbf121f | 2028 | if (!sci_getreg(port, SCSPTR)->size) { |
bbb4ce50 SY |
2029 | /* |
2030 | * Not supported by hardware. Most parts couple break and rx | |
2031 | * interrupts together, with break detection always enabled. | |
2032 | */ | |
a4e02f6d | 2033 | return; |
bbb4ce50 | 2034 | } |
a4e02f6d | 2035 | |
1be22663 | 2036 | spin_lock_irqsave(&port->lock, flags); |
a4e02f6d SY |
2037 | scsptr = serial_port_in(port, SCSPTR); |
2038 | scscr = serial_port_in(port, SCSCR); | |
2039 | ||
2040 | if (break_state == -1) { | |
2041 | scsptr = (scsptr | SCSPTR_SPB2IO) & ~SCSPTR_SPB2DT; | |
2042 | scscr &= ~SCSCR_TE; | |
2043 | } else { | |
2044 | scsptr = (scsptr | SCSPTR_SPB2DT) & ~SCSPTR_SPB2IO; | |
2045 | scscr |= SCSCR_TE; | |
2046 | } | |
2047 | ||
2048 | serial_port_out(port, SCSPTR, scsptr); | |
2049 | serial_port_out(port, SCSCR, scscr); | |
1be22663 | 2050 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
2051 | } |
2052 | ||
2053 | static int sci_startup(struct uart_port *port) | |
2054 | { | |
a5660ada | 2055 | struct sci_port *s = to_sci_port(port); |
073e84c9 | 2056 | int ret; |
1da177e4 | 2057 | |
73a19e4c GL |
2058 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
2059 | ||
3c910176 TA |
2060 | sci_request_dma(port); |
2061 | ||
073e84c9 | 2062 | ret = sci_request_irq(s); |
3c910176 TA |
2063 | if (unlikely(ret < 0)) { |
2064 | sci_free_dma(port); | |
073e84c9 | 2065 | return ret; |
3c910176 | 2066 | } |
073e84c9 | 2067 | |
1da177e4 LT |
2068 | return 0; |
2069 | } | |
2070 | ||
2071 | static void sci_shutdown(struct uart_port *port) | |
2072 | { | |
a5660ada | 2073 | struct sci_port *s = to_sci_port(port); |
33b48e16 | 2074 | unsigned long flags; |
5fd2b6ee | 2075 | u16 scr; |
1da177e4 | 2076 | |
73a19e4c GL |
2077 | dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); |
2078 | ||
33f50ffc | 2079 | s->autorts = false; |
f907c9ea GU |
2080 | mctrl_gpio_disable_ms(to_sci_port(port)->gpios); |
2081 | ||
33b48e16 | 2082 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 2083 | sci_stop_rx(port); |
b129a8cc | 2084 | sci_stop_tx(port); |
fa2abb03 UH |
2085 | /* |
2086 | * Stop RX and TX, disable related interrupts, keep clock source | |
2087 | * and HSCIF TOT bits | |
2088 | */ | |
5fd2b6ee | 2089 | scr = serial_port_in(port, SCSCR); |
fa2abb03 UH |
2090 | serial_port_out(port, SCSCR, scr & |
2091 | (SCSCR_CKE1 | SCSCR_CKE0 | s->hscif_tot)); | |
33b48e16 | 2092 | spin_unlock_irqrestore(&port->lock, flags); |
073e84c9 | 2093 | |
9ab76556 AM |
2094 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
2095 | if (s->chan_rx) { | |
2096 | dev_dbg(port->dev, "%s(%d) deleting rx_timer\n", __func__, | |
2097 | port->line); | |
b96408b4 | 2098 | hrtimer_cancel(&s->rx_timer); |
9ab76556 AM |
2099 | } |
2100 | #endif | |
2101 | ||
1da177e4 | 2102 | sci_free_irq(s); |
3c910176 | 2103 | sci_free_dma(port); |
1da177e4 LT |
2104 | } |
2105 | ||
6af27bf2 GU |
2106 | static int sci_sck_calc(struct sci_port *s, unsigned int bps, |
2107 | unsigned int *srr) | |
26c92f37 | 2108 | { |
6af27bf2 | 2109 | unsigned long freq = s->clk_rates[SCI_SCK]; |
6af27bf2 | 2110 | int err, min_err = INT_MAX; |
69eee8e9 | 2111 | unsigned int sr; |
6af27bf2 | 2112 | |
7b5c0c08 GU |
2113 | if (s->port.type != PORT_HSCIF) |
2114 | freq *= 2; | |
6af27bf2 | 2115 | |
69eee8e9 | 2116 | for_each_sr(sr, s) { |
6af27bf2 GU |
2117 | err = DIV_ROUND_CLOSEST(freq, sr) - bps; |
2118 | if (abs(err) >= abs(min_err)) | |
2119 | continue; | |
2120 | ||
2121 | min_err = err; | |
2122 | *srr = sr - 1; | |
ec09c5eb | 2123 | |
6af27bf2 GU |
2124 | if (!err) |
2125 | break; | |
2126 | } | |
e8183a6c | 2127 | |
6af27bf2 GU |
2128 | dev_dbg(s->port.dev, "SCK: %u%+d bps using SR %u\n", bps, min_err, |
2129 | *srr + 1); | |
2130 | return min_err; | |
26c92f37 PM |
2131 | } |
2132 | ||
1270f865 GU |
2133 | static int sci_brg_calc(struct sci_port *s, unsigned int bps, |
2134 | unsigned long freq, unsigned int *dlr, | |
2135 | unsigned int *srr) | |
730c4e78 | 2136 | { |
1270f865 | 2137 | int err, min_err = INT_MAX; |
69eee8e9 | 2138 | unsigned int sr, dl; |
730c4e78 | 2139 | |
7b5c0c08 GU |
2140 | if (s->port.type != PORT_HSCIF) |
2141 | freq *= 2; | |
730c4e78 | 2142 | |
69eee8e9 | 2143 | for_each_sr(sr, s) { |
1270f865 GU |
2144 | dl = DIV_ROUND_CLOSEST(freq, sr * bps); |
2145 | dl = clamp(dl, 1U, 65535U); | |
2146 | ||
2147 | err = DIV_ROUND_CLOSEST(freq, sr * dl) - bps; | |
2148 | if (abs(err) >= abs(min_err)) | |
2149 | continue; | |
2150 | ||
2151 | min_err = err; | |
2152 | *dlr = dl; | |
2153 | *srr = sr - 1; | |
2154 | ||
2155 | if (!err) | |
2156 | break; | |
2157 | } | |
730c4e78 | 2158 | |
1270f865 GU |
2159 | dev_dbg(s->port.dev, "BRG: %u%+d bps using DL %u SR %u\n", bps, |
2160 | min_err, *dlr, *srr + 1); | |
2161 | return min_err; | |
2162 | } | |
730c4e78 | 2163 | |
b4a5c459 | 2164 | /* calculate sample rate, BRR, and clock select */ |
f4998e55 GU |
2165 | static int sci_scbrr_calc(struct sci_port *s, unsigned int bps, |
2166 | unsigned int *brr, unsigned int *srr, | |
2167 | unsigned int *cks) | |
f303b364 | 2168 | { |
f4998e55 | 2169 | unsigned long freq = s->clk_rates[SCI_FCK]; |
69eee8e9 | 2170 | unsigned int sr, br, prediv, scrate, c; |
6c51332d | 2171 | int err, min_err = INT_MAX; |
f303b364 | 2172 | |
7b5c0c08 GU |
2173 | if (s->port.type != PORT_HSCIF) |
2174 | freq *= 2; | |
b4a5c459 | 2175 | |
6c51332d GU |
2176 | /* |
2177 | * Find the combination of sample rate and clock select with the | |
2178 | * smallest deviation from the desired baud rate. | |
2179 | * Prefer high sample rates to maximise the receive margin. | |
2180 | * | |
2181 | * M: Receive margin (%) | |
2182 | * N: Ratio of bit rate to clock (N = sampling rate) | |
2183 | * D: Clock duty (D = 0 to 1.0) | |
2184 | * L: Frame length (L = 9 to 12) | |
2185 | * F: Absolute value of clock frequency deviation | |
2186 | * | |
2187 | * M = |(0.5 - 1 / 2 * N) - ((L - 0.5) * F) - | |
2188 | * (|D - 0.5| / N * (1 + F))| | |
2189 | * NOTE: Usually, treat D for 0.5, F is 0 by this calculation. | |
2190 | */ | |
69eee8e9 | 2191 | for_each_sr(sr, s) { |
f303b364 UH |
2192 | for (c = 0; c <= 3; c++) { |
2193 | /* integerized formulas from HSCIF documentation */ | |
7b5c0c08 | 2194 | prediv = sr * (1 << (2 * c + 1)); |
de01e6cd GU |
2195 | |
2196 | /* | |
2197 | * We need to calculate: | |
2198 | * | |
2199 | * br = freq / (prediv * bps) clamped to [1..256] | |
881a7489 | 2200 | * err = freq / (br * prediv) - bps |
730c4e78 | 2201 | * |
de01e6cd GU |
2202 | * Watch out for overflow when calculating the desired |
2203 | * sampling clock rate! | |
730c4e78 | 2204 | */ |
de01e6cd GU |
2205 | if (bps > UINT_MAX / prediv) |
2206 | break; | |
2207 | ||
2208 | scrate = prediv * bps; | |
2209 | br = DIV_ROUND_CLOSEST(freq, scrate); | |
95a2703e | 2210 | br = clamp(br, 1U, 256U); |
6c51332d | 2211 | |
881a7489 | 2212 | err = DIV_ROUND_CLOSEST(freq, br * prediv) - bps; |
6c51332d | 2213 | if (abs(err) >= abs(min_err)) |
730c4e78 NI |
2214 | continue; |
2215 | ||
6c51332d | 2216 | min_err = err; |
95a2703e | 2217 | *brr = br - 1; |
730c4e78 NI |
2218 | *srr = sr - 1; |
2219 | *cks = c; | |
6c51332d GU |
2220 | |
2221 | if (!err) | |
2222 | goto found; | |
f303b364 UH |
2223 | } |
2224 | } | |
2225 | ||
6c51332d | 2226 | found: |
881a7489 GU |
2227 | dev_dbg(s->port.dev, "BRR: %u%+d bps using N %u SR %u cks %u\n", bps, |
2228 | min_err, *brr, *srr + 1, *cks); | |
f4998e55 | 2229 | return min_err; |
f303b364 UH |
2230 | } |
2231 | ||
1ba76220 MD |
2232 | static void sci_reset(struct uart_port *port) |
2233 | { | |
d3184e68 | 2234 | const struct plat_sci_reg *reg; |
1ba76220 | 2235 | unsigned int status; |
18e8cf15 | 2236 | struct sci_port *s = to_sci_port(port); |
1ba76220 | 2237 | |
fa2abb03 | 2238 | serial_port_out(port, SCSCR, s->hscif_tot); /* TE=0, RE=0, CKE1=0 */ |
1ba76220 | 2239 | |
0979e0e6 PM |
2240 | reg = sci_getreg(port, SCFCR); |
2241 | if (reg->size) | |
b12bb29f | 2242 | serial_port_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); |
2768cf42 GU |
2243 | |
2244 | sci_clear_SCxSR(port, | |
2245 | SCxSR_RDxF_CLEAR(port) & SCxSR_ERROR_CLEAR(port) & | |
2246 | SCxSR_BREAK_CLEAR(port)); | |
fc2af334 GU |
2247 | if (sci_getreg(port, SCLSR)->size) { |
2248 | status = serial_port_in(port, SCLSR); | |
2249 | status &= ~(SCLSR_TO | SCLSR_ORER); | |
2250 | serial_port_out(port, SCLSR, status); | |
2251 | } | |
18e8cf15 | 2252 | |
03940376 UH |
2253 | if (s->rx_trigger > 1) { |
2254 | if (s->rx_fifo_timeout) { | |
2255 | scif_set_rtrg(port, 1); | |
e99e88a9 | 2256 | timer_setup(&s->rx_fifo_timer, rx_fifo_timer_fn, 0); |
03940376 | 2257 | } else { |
90afa525 UH |
2258 | if (port->type == PORT_SCIFA || |
2259 | port->type == PORT_SCIFB) | |
2260 | scif_set_rtrg(port, 1); | |
2261 | else | |
2262 | scif_set_rtrg(port, s->rx_trigger); | |
03940376 UH |
2263 | } |
2264 | } | |
1ba76220 MD |
2265 | } |
2266 | ||
606d099c AC |
2267 | static void sci_set_termios(struct uart_port *port, struct ktermios *termios, |
2268 | struct ktermios *old) | |
1da177e4 | 2269 | { |
03940376 | 2270 | unsigned int baud, smr_val = SCSMR_ASYNC, scr_val = 0, i, bits; |
1270f865 GU |
2271 | unsigned int brr = 255, cks = 0, srr = 15, dl = 0, sccks = 0; |
2272 | unsigned int brr1 = 255, cks1 = 0, srr1 = 15, dl1 = 0; | |
00b9de9c | 2273 | struct sci_port *s = to_sci_port(port); |
d3184e68 | 2274 | const struct plat_sci_reg *reg; |
f4998e55 GU |
2275 | int min_err = INT_MAX, err; |
2276 | unsigned long max_freq = 0; | |
2277 | int best_clk = -1; | |
1be22663 | 2278 | unsigned long flags; |
1da177e4 | 2279 | |
730c4e78 NI |
2280 | if ((termios->c_cflag & CSIZE) == CS7) |
2281 | smr_val |= SCSMR_CHR; | |
2282 | if (termios->c_cflag & PARENB) | |
2283 | smr_val |= SCSMR_PE; | |
2284 | if (termios->c_cflag & PARODD) | |
2285 | smr_val |= SCSMR_PE | SCSMR_ODD; | |
2286 | if (termios->c_cflag & CSTOPB) | |
2287 | smr_val |= SCSMR_STOP; | |
2288 | ||
154280fd MD |
2289 | /* |
2290 | * earlyprintk comes here early on with port->uartclk set to zero. | |
2291 | * the clock framework is not up and running at this point so here | |
2292 | * we assume that 115200 is the maximum baud rate. please note that | |
2293 | * the baud rate is not programmed during earlyprintk - it is assumed | |
2294 | * that the previous boot loader has enabled required clocks and | |
2295 | * setup the baud rate generator hardware for us already. | |
2296 | */ | |
f4998e55 GU |
2297 | if (!port->uartclk) { |
2298 | baud = uart_get_baud_rate(port, termios, old, 0, 115200); | |
2299 | goto done; | |
2300 | } | |
1da177e4 | 2301 | |
f4998e55 GU |
2302 | for (i = 0; i < SCI_NUM_CLKS; i++) |
2303 | max_freq = max(max_freq, s->clk_rates[i]); | |
2304 | ||
69eee8e9 | 2305 | baud = uart_get_baud_rate(port, termios, old, 0, max_freq / min_sr(s)); |
f4998e55 GU |
2306 | if (!baud) |
2307 | goto done; | |
2308 | ||
2309 | /* | |
2310 | * There can be multiple sources for the sampling clock. Find the one | |
2311 | * that gives us the smallest deviation from the desired baud rate. | |
2312 | */ | |
2313 | ||
6af27bf2 GU |
2314 | /* Optional Undivided External Clock */ |
2315 | if (s->clk_rates[SCI_SCK] && port->type != PORT_SCIFA && | |
2316 | port->type != PORT_SCIFB) { | |
2317 | err = sci_sck_calc(s, baud, &srr1); | |
2318 | if (abs(err) < abs(min_err)) { | |
2319 | best_clk = SCI_SCK; | |
2320 | scr_val = SCSCR_CKE1; | |
2321 | sccks = SCCKS_CKS; | |
2322 | min_err = err; | |
2323 | srr = srr1; | |
2324 | if (!err) | |
2325 | goto done; | |
2326 | } | |
2327 | } | |
2328 | ||
1270f865 GU |
2329 | /* Optional BRG Frequency Divided External Clock */ |
2330 | if (s->clk_rates[SCI_SCIF_CLK] && sci_getreg(port, SCDL)->size) { | |
2331 | err = sci_brg_calc(s, baud, s->clk_rates[SCI_SCIF_CLK], &dl1, | |
2332 | &srr1); | |
2333 | if (abs(err) < abs(min_err)) { | |
2334 | best_clk = SCI_SCIF_CLK; | |
2335 | scr_val = SCSCR_CKE1; | |
2336 | sccks = 0; | |
2337 | min_err = err; | |
2338 | dl = dl1; | |
2339 | srr = srr1; | |
2340 | if (!err) | |
2341 | goto done; | |
2342 | } | |
2343 | } | |
2344 | ||
2345 | /* Optional BRG Frequency Divided Internal Clock */ | |
2346 | if (s->clk_rates[SCI_BRG_INT] && sci_getreg(port, SCDL)->size) { | |
2347 | err = sci_brg_calc(s, baud, s->clk_rates[SCI_BRG_INT], &dl1, | |
2348 | &srr1); | |
2349 | if (abs(err) < abs(min_err)) { | |
2350 | best_clk = SCI_BRG_INT; | |
2351 | scr_val = SCSCR_CKE1; | |
2352 | sccks = SCCKS_XIN; | |
2353 | min_err = err; | |
2354 | dl = dl1; | |
2355 | srr = srr1; | |
2356 | if (!min_err) | |
2357 | goto done; | |
f303b364 UH |
2358 | } |
2359 | } | |
e108b2ca | 2360 | |
f4998e55 GU |
2361 | /* Divided Functional Clock using standard Bit Rate Register */ |
2362 | err = sci_scbrr_calc(s, baud, &brr1, &srr1, &cks1); | |
2363 | if (abs(err) < abs(min_err)) { | |
2364 | best_clk = SCI_FCK; | |
6af27bf2 | 2365 | scr_val = 0; |
f4998e55 GU |
2366 | min_err = err; |
2367 | brr = brr1; | |
2368 | srr = srr1; | |
2369 | cks = cks1; | |
2370 | } | |
2371 | ||
2372 | done: | |
2373 | if (best_clk >= 0) | |
2374 | dev_dbg(port->dev, "Using clk %pC for %u%+d bps\n", | |
2375 | s->clks[best_clk], baud, min_err); | |
e108b2ca | 2376 | |
23241d43 | 2377 | sci_port_enable(s); |
36003386 | 2378 | |
6af27bf2 GU |
2379 | /* |
2380 | * Program the optional External Baud Rate Generator (BRG) first. | |
2381 | * It controls the mux to select (H)SCK or frequency divided clock. | |
2382 | */ | |
1270f865 GU |
2383 | if (best_clk >= 0 && sci_getreg(port, SCCKS)->size) { |
2384 | serial_port_out(port, SCDL, dl); | |
6af27bf2 | 2385 | serial_port_out(port, SCCKS, sccks); |
1270f865 | 2386 | } |
1da177e4 | 2387 | |
1be22663 TA |
2388 | spin_lock_irqsave(&port->lock, flags); |
2389 | ||
1ba76220 | 2390 | sci_reset(port); |
1da177e4 LT |
2391 | |
2392 | uart_update_timeout(port, termios->c_cflag, baud); | |
2393 | ||
63ba1e00 UH |
2394 | /* byte size and parity */ |
2395 | switch (termios->c_cflag & CSIZE) { | |
2396 | case CS5: | |
2397 | bits = 7; | |
2398 | break; | |
2399 | case CS6: | |
2400 | bits = 8; | |
2401 | break; | |
2402 | case CS7: | |
2403 | bits = 9; | |
2404 | break; | |
2405 | default: | |
2406 | bits = 10; | |
2407 | break; | |
2408 | } | |
2409 | ||
2410 | if (termios->c_cflag & CSTOPB) | |
2411 | bits++; | |
2412 | if (termios->c_cflag & PARENB) | |
2413 | bits++; | |
2414 | ||
f4998e55 | 2415 | if (best_clk >= 0) { |
92a05748 GU |
2416 | if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) |
2417 | switch (srr + 1) { | |
2418 | case 5: smr_val |= SCSMR_SRC_5; break; | |
2419 | case 7: smr_val |= SCSMR_SRC_7; break; | |
2420 | case 11: smr_val |= SCSMR_SRC_11; break; | |
2421 | case 13: smr_val |= SCSMR_SRC_13; break; | |
2422 | case 16: smr_val |= SCSMR_SRC_16; break; | |
2423 | case 17: smr_val |= SCSMR_SRC_17; break; | |
2424 | case 19: smr_val |= SCSMR_SRC_19; break; | |
2425 | case 27: smr_val |= SCSMR_SRC_27; break; | |
2426 | } | |
f4998e55 | 2427 | smr_val |= cks; |
fa2abb03 | 2428 | serial_port_out(port, SCSCR, scr_val | s->hscif_tot); |
f4998e55 GU |
2429 | serial_port_out(port, SCSMR, smr_val); |
2430 | serial_port_out(port, SCBRR, brr); | |
63ba1e00 UH |
2431 | if (sci_getreg(port, HSSRR)->size) { |
2432 | unsigned int hssrr = srr | HSCIF_SRE; | |
2433 | /* Calculate deviation from intended rate at the | |
2434 | * center of the last stop bit in sampling clocks. | |
2435 | */ | |
2436 | int last_stop = bits * 2 - 1; | |
2437 | int deviation = min_err * srr * last_stop / 2 / baud; | |
2438 | ||
2439 | if (abs(deviation) >= 2) { | |
2440 | /* At least two sampling clocks off at the | |
2441 | * last stop bit; we can increase the error | |
2442 | * margin by shifting the sampling point. | |
2443 | */ | |
2444 | int shift = min(-8, max(7, deviation / 2)); | |
2445 | ||
2446 | hssrr |= (shift << HSCIF_SRHP_SHIFT) & | |
2447 | HSCIF_SRHP_MASK; | |
2448 | hssrr |= HSCIF_SRDE; | |
2449 | } | |
2450 | serial_port_out(port, HSSRR, hssrr); | |
2451 | } | |
f4998e55 GU |
2452 | |
2453 | /* Wait one bit interval */ | |
2454 | udelay((1000000 + (baud - 1)) / baud); | |
2455 | } else { | |
2456 | /* Don't touch the bit rate configuration */ | |
2457 | scr_val = s->cfg->scscr & (SCSCR_CKE1 | SCSCR_CKE0); | |
3a964abe GU |
2458 | smr_val |= serial_port_in(port, SCSMR) & |
2459 | (SCSMR_CKEDG | SCSMR_SRC_MASK | SCSMR_CKS); | |
fa2abb03 | 2460 | serial_port_out(port, SCSCR, scr_val | s->hscif_tot); |
9d482cc3 | 2461 | serial_port_out(port, SCSMR, smr_val); |
f4998e55 | 2462 | } |
1da177e4 | 2463 | |
d5701647 | 2464 | sci_init_pins(port, termios->c_cflag); |
0979e0e6 | 2465 | |
33f50ffc GU |
2466 | port->status &= ~UPSTAT_AUTOCTS; |
2467 | s->autorts = false; | |
73c3d53f PM |
2468 | reg = sci_getreg(port, SCFCR); |
2469 | if (reg->size) { | |
b12bb29f | 2470 | unsigned short ctrl = serial_port_in(port, SCFCR); |
0979e0e6 | 2471 | |
33f50ffc GU |
2472 | if ((port->flags & UPF_HARD_FLOW) && |
2473 | (termios->c_cflag & CRTSCTS)) { | |
2474 | /* There is no CTS interrupt to restart the hardware */ | |
2475 | port->status |= UPSTAT_AUTOCTS; | |
2476 | /* MCE is enabled when RTS is raised */ | |
2477 | s->autorts = true; | |
faf02f8f | 2478 | } |
73c3d53f PM |
2479 | |
2480 | /* | |
2481 | * As we've done a sci_reset() above, ensure we don't | |
2482 | * interfere with the FIFOs while toggling MCE. As the | |
2483 | * reset values could still be set, simply mask them out. | |
2484 | */ | |
2485 | ctrl &= ~(SCFCR_RFRST | SCFCR_TFRST); | |
2486 | ||
b12bb29f | 2487 | serial_port_out(port, SCFCR, ctrl); |
0979e0e6 | 2488 | } |
5f76895e GU |
2489 | if (port->flags & UPF_HARD_FLOW) { |
2490 | /* Refresh (Auto) RTS */ | |
2491 | sci_set_mctrl(port, port->mctrl); | |
2492 | } | |
b7a76e4b | 2493 | |
9f8325b3 LP |
2494 | scr_val |= SCSCR_RE | SCSCR_TE | |
2495 | (s->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0)); | |
fa2abb03 | 2496 | serial_port_out(port, SCSCR, scr_val | s->hscif_tot); |
92a05748 GU |
2497 | if ((srr + 1 == 5) && |
2498 | (port->type == PORT_SCIFA || port->type == PORT_SCIFB)) { | |
2499 | /* | |
2500 | * In asynchronous mode, when the sampling rate is 1/5, first | |
2501 | * received data may become invalid on some SCIFA and SCIFB. | |
2502 | * To avoid this problem wait more than 1 serial data time (1 | |
2503 | * bit time x serial data number) after setting SCSCR.RE = 1. | |
2504 | */ | |
2505 | udelay(DIV_ROUND_UP(10 * 1000000, baud)); | |
2506 | } | |
1da177e4 | 2507 | |
3089f381 | 2508 | /* |
5f6d8515 | 2509 | * Calculate delay for 2 DMA buffers (4 FIFO). |
f5835c1d GU |
2510 | * See serial_core.c::uart_update_timeout(). |
2511 | * With 10 bits (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above | |
2512 | * function calculates 1 jiffie for the data plus 5 jiffies for the | |
2513 | * "slop(e)." Then below we calculate 5 jiffies (20ms) for 2 DMA | |
2514 | * buffers (4 FIFO sizes), but when performing a faster transfer, the | |
2515 | * value obtained by this formula is too small. Therefore, if the value | |
2516 | * is smaller than 20ms, use 20ms as the timeout value for DMA. | |
3089f381 | 2517 | */ |
b96408b4 | 2518 | s->rx_frame = (10000 * bits) / (baud / 100); |
03940376 | 2519 | #ifdef CONFIG_SERIAL_SH_SCI_DMA |
b96408b4 UH |
2520 | s->rx_timeout = s->buf_len_rx * 2 * s->rx_frame; |
2521 | if (s->rx_timeout < 20) | |
2522 | s->rx_timeout = 20; | |
3089f381 GL |
2523 | #endif |
2524 | ||
1da177e4 | 2525 | if ((termios->c_cflag & CREAD) != 0) |
73a19e4c | 2526 | sci_start_rx(port); |
36003386 | 2527 | |
1be22663 TA |
2528 | spin_unlock_irqrestore(&port->lock, flags); |
2529 | ||
23241d43 | 2530 | sci_port_disable(s); |
f907c9ea GU |
2531 | |
2532 | if (UART_ENABLE_MS(port, termios->c_cflag)) | |
2533 | sci_enable_ms(port); | |
1da177e4 LT |
2534 | } |
2535 | ||
0174e5ca TK |
2536 | static void sci_pm(struct uart_port *port, unsigned int state, |
2537 | unsigned int oldstate) | |
2538 | { | |
2539 | struct sci_port *sci_port = to_sci_port(port); | |
2540 | ||
2541 | switch (state) { | |
d3dfe5d9 | 2542 | case UART_PM_STATE_OFF: |
0174e5ca TK |
2543 | sci_port_disable(sci_port); |
2544 | break; | |
2545 | default: | |
2546 | sci_port_enable(sci_port); | |
2547 | break; | |
2548 | } | |
2549 | } | |
2550 | ||
1da177e4 LT |
2551 | static const char *sci_type(struct uart_port *port) |
2552 | { | |
2553 | switch (port->type) { | |
e7c98dc7 MT |
2554 | case PORT_IRDA: |
2555 | return "irda"; | |
2556 | case PORT_SCI: | |
2557 | return "sci"; | |
2558 | case PORT_SCIF: | |
2559 | return "scif"; | |
2560 | case PORT_SCIFA: | |
2561 | return "scifa"; | |
d1d4b10c GL |
2562 | case PORT_SCIFB: |
2563 | return "scifb"; | |
f303b364 UH |
2564 | case PORT_HSCIF: |
2565 | return "hscif"; | |
1da177e4 LT |
2566 | } |
2567 | ||
fa43972f | 2568 | return NULL; |
1da177e4 LT |
2569 | } |
2570 | ||
f6e9495d PM |
2571 | static int sci_remap_port(struct uart_port *port) |
2572 | { | |
e4d6f911 | 2573 | struct sci_port *sport = to_sci_port(port); |
f6e9495d PM |
2574 | |
2575 | /* | |
2576 | * Nothing to do if there's already an established membase. | |
2577 | */ | |
2578 | if (port->membase) | |
2579 | return 0; | |
2580 | ||
3d73f32b | 2581 | if (port->dev->of_node || (port->flags & UPF_IOREMAP)) { |
e4d6f911 | 2582 | port->membase = ioremap_nocache(port->mapbase, sport->reg_size); |
f6e9495d PM |
2583 | if (unlikely(!port->membase)) { |
2584 | dev_err(port->dev, "can't remap port#%d\n", port->line); | |
2585 | return -ENXIO; | |
2586 | } | |
2587 | } else { | |
2588 | /* | |
2589 | * For the simple (and majority of) cases where we don't | |
2590 | * need to do any remapping, just cast the cookie | |
2591 | * directly. | |
2592 | */ | |
3af4e960 | 2593 | port->membase = (void __iomem *)(uintptr_t)port->mapbase; |
f6e9495d PM |
2594 | } |
2595 | ||
2596 | return 0; | |
2597 | } | |
2598 | ||
e2651647 | 2599 | static void sci_release_port(struct uart_port *port) |
1da177e4 | 2600 | { |
e4d6f911 YS |
2601 | struct sci_port *sport = to_sci_port(port); |
2602 | ||
3d73f32b | 2603 | if (port->dev->of_node || (port->flags & UPF_IOREMAP)) { |
e2651647 PM |
2604 | iounmap(port->membase); |
2605 | port->membase = NULL; | |
2606 | } | |
2607 | ||
e4d6f911 | 2608 | release_mem_region(port->mapbase, sport->reg_size); |
1da177e4 LT |
2609 | } |
2610 | ||
e2651647 | 2611 | static int sci_request_port(struct uart_port *port) |
1da177e4 | 2612 | { |
e2651647 | 2613 | struct resource *res; |
e4d6f911 | 2614 | struct sci_port *sport = to_sci_port(port); |
f6e9495d | 2615 | int ret; |
1da177e4 | 2616 | |
e4d6f911 YS |
2617 | res = request_mem_region(port->mapbase, sport->reg_size, |
2618 | dev_name(port->dev)); | |
2619 | if (unlikely(res == NULL)) { | |
2620 | dev_err(port->dev, "request_mem_region failed."); | |
e2651647 | 2621 | return -EBUSY; |
e4d6f911 | 2622 | } |
1da177e4 | 2623 | |
f6e9495d PM |
2624 | ret = sci_remap_port(port); |
2625 | if (unlikely(ret != 0)) { | |
2626 | release_resource(res); | |
2627 | return ret; | |
7ff731ae | 2628 | } |
e2651647 PM |
2629 | |
2630 | return 0; | |
2631 | } | |
2632 | ||
2633 | static void sci_config_port(struct uart_port *port, int flags) | |
2634 | { | |
2635 | if (flags & UART_CONFIG_TYPE) { | |
2636 | struct sci_port *sport = to_sci_port(port); | |
2637 | ||
2638 | port->type = sport->cfg->type; | |
2639 | sci_request_port(port); | |
2640 | } | |
1da177e4 LT |
2641 | } |
2642 | ||
2643 | static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) | |
2644 | { | |
1da177e4 LT |
2645 | if (ser->baud_base < 2400) |
2646 | /* No paper tape reader for Mitch.. */ | |
2647 | return -EINVAL; | |
2648 | ||
2649 | return 0; | |
2650 | } | |
2651 | ||
069a47e5 | 2652 | static const struct uart_ops sci_uart_ops = { |
1da177e4 LT |
2653 | .tx_empty = sci_tx_empty, |
2654 | .set_mctrl = sci_set_mctrl, | |
2655 | .get_mctrl = sci_get_mctrl, | |
2656 | .start_tx = sci_start_tx, | |
2657 | .stop_tx = sci_stop_tx, | |
2658 | .stop_rx = sci_stop_rx, | |
f907c9ea | 2659 | .enable_ms = sci_enable_ms, |
1da177e4 LT |
2660 | .break_ctl = sci_break_ctl, |
2661 | .startup = sci_startup, | |
2662 | .shutdown = sci_shutdown, | |
1cf4a7ef | 2663 | .flush_buffer = sci_flush_buffer, |
1da177e4 | 2664 | .set_termios = sci_set_termios, |
0174e5ca | 2665 | .pm = sci_pm, |
1da177e4 LT |
2666 | .type = sci_type, |
2667 | .release_port = sci_release_port, | |
2668 | .request_port = sci_request_port, | |
2669 | .config_port = sci_config_port, | |
2670 | .verify_port = sci_verify_port, | |
07d2a1a1 PM |
2671 | #ifdef CONFIG_CONSOLE_POLL |
2672 | .poll_get_char = sci_poll_get_char, | |
2673 | .poll_put_char = sci_poll_put_char, | |
2674 | #endif | |
1da177e4 LT |
2675 | }; |
2676 | ||
a9ec81f4 LP |
2677 | static int sci_init_clocks(struct sci_port *sci_port, struct device *dev) |
2678 | { | |
f4998e55 GU |
2679 | const char *clk_names[] = { |
2680 | [SCI_FCK] = "fck", | |
6af27bf2 | 2681 | [SCI_SCK] = "sck", |
1270f865 GU |
2682 | [SCI_BRG_INT] = "brg_int", |
2683 | [SCI_SCIF_CLK] = "scif_clk", | |
f4998e55 GU |
2684 | }; |
2685 | struct clk *clk; | |
2686 | unsigned int i; | |
a9ec81f4 | 2687 | |
6af27bf2 GU |
2688 | if (sci_port->cfg->type == PORT_HSCIF) |
2689 | clk_names[SCI_SCK] = "hsck"; | |
2690 | ||
f4998e55 GU |
2691 | for (i = 0; i < SCI_NUM_CLKS; i++) { |
2692 | clk = devm_clk_get(dev, clk_names[i]); | |
2693 | if (PTR_ERR(clk) == -EPROBE_DEFER) | |
2694 | return -EPROBE_DEFER; | |
a9ec81f4 | 2695 | |
f4998e55 GU |
2696 | if (IS_ERR(clk) && i == SCI_FCK) { |
2697 | /* | |
2698 | * "fck" used to be called "sci_ick", and we need to | |
2699 | * maintain DT backward compatibility. | |
2700 | */ | |
2701 | clk = devm_clk_get(dev, "sci_ick"); | |
2702 | if (PTR_ERR(clk) == -EPROBE_DEFER) | |
2703 | return -EPROBE_DEFER; | |
a9ec81f4 | 2704 | |
f4998e55 GU |
2705 | if (!IS_ERR(clk)) |
2706 | goto found; | |
a9ec81f4 | 2707 | |
f4998e55 GU |
2708 | /* |
2709 | * Not all SH platforms declare a clock lookup entry | |
2710 | * for SCI devices, in which case we need to get the | |
2711 | * global "peripheral_clk" clock. | |
2712 | */ | |
2713 | clk = devm_clk_get(dev, "peripheral_clk"); | |
2714 | if (!IS_ERR(clk)) | |
2715 | goto found; | |
2716 | ||
2717 | dev_err(dev, "failed to get %s (%ld)\n", clk_names[i], | |
2718 | PTR_ERR(clk)); | |
2719 | return PTR_ERR(clk); | |
2720 | } | |
2721 | ||
2722 | found: | |
2723 | if (IS_ERR(clk)) | |
2724 | dev_dbg(dev, "failed to get %s (%ld)\n", clk_names[i], | |
2725 | PTR_ERR(clk)); | |
2726 | else | |
d63c16f8 GU |
2727 | dev_dbg(dev, "clk %s is %pC rate %lu\n", clk_names[i], |
2728 | clk, clk_get_rate(clk)); | |
f4998e55 GU |
2729 | sci_port->clks[i] = IS_ERR(clk) ? NULL : clk; |
2730 | } | |
2731 | return 0; | |
a9ec81f4 LP |
2732 | } |
2733 | ||
daf5a895 LP |
2734 | static const struct sci_port_params * |
2735 | sci_probe_regmap(const struct plat_sci_port *cfg) | |
2736 | { | |
2737 | unsigned int regtype; | |
2738 | ||
2739 | if (cfg->regtype != SCIx_PROBE_REGTYPE) | |
2740 | return &sci_port_params[cfg->regtype]; | |
2741 | ||
2742 | switch (cfg->type) { | |
2743 | case PORT_SCI: | |
2744 | regtype = SCIx_SCI_REGTYPE; | |
2745 | break; | |
2746 | case PORT_IRDA: | |
2747 | regtype = SCIx_IRDA_REGTYPE; | |
2748 | break; | |
2749 | case PORT_SCIFA: | |
2750 | regtype = SCIx_SCIFA_REGTYPE; | |
2751 | break; | |
2752 | case PORT_SCIFB: | |
2753 | regtype = SCIx_SCIFB_REGTYPE; | |
2754 | break; | |
2755 | case PORT_SCIF: | |
2756 | /* | |
2757 | * The SH-4 is a bit of a misnomer here, although that's | |
2758 | * where this particular port layout originated. This | |
2759 | * configuration (or some slight variation thereof) | |
2760 | * remains the dominant model for all SCIFs. | |
2761 | */ | |
2762 | regtype = SCIx_SH4_SCIF_REGTYPE; | |
2763 | break; | |
2764 | case PORT_HSCIF: | |
2765 | regtype = SCIx_HSCIF_REGTYPE; | |
2766 | break; | |
2767 | default: | |
2768 | pr_err("Can't probe register map for given port\n"); | |
2769 | return NULL; | |
2770 | } | |
2771 | ||
2772 | return &sci_port_params[regtype]; | |
2773 | } | |
2774 | ||
9671f099 | 2775 | static int sci_init_single(struct platform_device *dev, |
1fcc91a6 | 2776 | struct sci_port *sci_port, unsigned int index, |
daf5a895 | 2777 | const struct plat_sci_port *p, bool early) |
e108b2ca | 2778 | { |
73a19e4c | 2779 | struct uart_port *port = &sci_port->port; |
1fcc91a6 LP |
2780 | const struct resource *res; |
2781 | unsigned int i; | |
3127c6b2 | 2782 | int ret; |
e108b2ca | 2783 | |
50f0959a PM |
2784 | sci_port->cfg = p; |
2785 | ||
73a19e4c GL |
2786 | port->ops = &sci_uart_ops; |
2787 | port->iotype = UPIO_MEM; | |
2788 | port->line = index; | |
75136d48 | 2789 | |
89b5c1ab LP |
2790 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
2791 | if (res == NULL) | |
2792 | return -ENOMEM; | |
1fcc91a6 | 2793 | |
89b5c1ab | 2794 | port->mapbase = res->start; |
e4d6f911 | 2795 | sci_port->reg_size = resource_size(res); |
1fcc91a6 | 2796 | |
89b5c1ab LP |
2797 | for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) |
2798 | sci_port->irqs[i] = platform_get_irq(dev, i); | |
1fcc91a6 | 2799 | |
89b5c1ab LP |
2800 | /* The SCI generates several interrupts. They can be muxed together or |
2801 | * connected to different interrupt lines. In the muxed case only one | |
2802 | * interrupt resource is specified. In the non-muxed case three or four | |
2803 | * interrupt resources are specified, as the BRI interrupt is optional. | |
2804 | */ | |
2805 | if (sci_port->irqs[0] < 0) | |
2806 | return -ENXIO; | |
1fcc91a6 | 2807 | |
89b5c1ab LP |
2808 | if (sci_port->irqs[1] < 0) { |
2809 | sci_port->irqs[1] = sci_port->irqs[0]; | |
2810 | sci_port->irqs[2] = sci_port->irqs[0]; | |
2811 | sci_port->irqs[3] = sci_port->irqs[0]; | |
1fcc91a6 LP |
2812 | } |
2813 | ||
daf5a895 LP |
2814 | sci_port->params = sci_probe_regmap(p); |
2815 | if (unlikely(sci_port->params == NULL)) | |
2816 | return -EINVAL; | |
e095ee6b | 2817 | |
18e8cf15 UH |
2818 | switch (p->type) { |
2819 | case PORT_SCIFB: | |
2820 | sci_port->rx_trigger = 48; | |
2821 | break; | |
2822 | case PORT_HSCIF: | |
2823 | sci_port->rx_trigger = 64; | |
2824 | break; | |
2825 | case PORT_SCIFA: | |
2826 | sci_port->rx_trigger = 32; | |
2827 | break; | |
2828 | case PORT_SCIF: | |
2829 | if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) | |
2830 | /* RX triggering not implemented for this IP */ | |
2831 | sci_port->rx_trigger = 1; | |
2832 | else | |
2833 | sci_port->rx_trigger = 8; | |
2834 | break; | |
2835 | default: | |
2836 | sci_port->rx_trigger = 1; | |
2837 | break; | |
2838 | } | |
2839 | ||
03940376 | 2840 | sci_port->rx_fifo_timeout = 0; |
fa2abb03 | 2841 | sci_port->hscif_tot = 0; |
03940376 | 2842 | |
878fbb91 LP |
2843 | /* SCIFA on sh7723 and sh7724 need a custom sampling rate that doesn't |
2844 | * match the SoC datasheet, this should be investigated. Let platform | |
2845 | * data override the sampling rate for now. | |
ec09c5eb | 2846 | */ |
b2f20ed9 LP |
2847 | sci_port->sampling_rate_mask = p->sampling_rate |
2848 | ? SCI_SR(p->sampling_rate) | |
2849 | : sci_port->params->sampling_rate_mask; | |
ec09c5eb | 2850 | |
1fcc91a6 | 2851 | if (!early) { |
a9ec81f4 LP |
2852 | ret = sci_init_clocks(sci_port, &dev->dev); |
2853 | if (ret < 0) | |
2854 | return ret; | |
c7ed1ab3 | 2855 | |
73a19e4c | 2856 | port->dev = &dev->dev; |
5e50d2d6 MD |
2857 | |
2858 | pm_runtime_enable(&dev->dev); | |
7b6fd3bf | 2859 | } |
e108b2ca | 2860 | |
ce6738b6 | 2861 | port->type = p->type; |
3d73f32b | 2862 | port->flags = UPF_FIXED_PORT | UPF_BOOT_AUTOCONF | p->flags; |
b2f20ed9 | 2863 | port->fifosize = sci_port->params->fifosize; |
73a19e4c | 2864 | |
dfc80387 LP |
2865 | if (port->type == PORT_SCI) { |
2866 | if (sci_port->reg_size >= 0x20) | |
2867 | port->regshift = 2; | |
2868 | else | |
2869 | port->regshift = 1; | |
2870 | } | |
2871 | ||
ce6738b6 | 2872 | /* |
61a6976b | 2873 | * The UART port needs an IRQ value, so we peg this to the RX IRQ |
ce6738b6 PM |
2874 | * for the multi-IRQ ports, which is where we are primarily |
2875 | * concerned with the shutdown path synchronization. | |
2876 | * | |
2877 | * For the muxed case there's nothing more to do. | |
2878 | */ | |
1fcc91a6 | 2879 | port->irq = sci_port->irqs[SCIx_RXI_IRQ]; |
9cfb5c05 | 2880 | port->irqflags = 0; |
73a19e4c | 2881 | |
61a6976b PM |
2882 | port->serial_in = sci_serial_in; |
2883 | port->serial_out = sci_serial_out; | |
2884 | ||
c7ed1ab3 | 2885 | return 0; |
e108b2ca PM |
2886 | } |
2887 | ||
6dae1421 LP |
2888 | static void sci_cleanup_single(struct sci_port *port) |
2889 | { | |
6dae1421 LP |
2890 | pm_runtime_disable(port->port.dev); |
2891 | } | |
2892 | ||
0b0cced1 YS |
2893 | #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || \ |
2894 | defined(CONFIG_SERIAL_SH_SCI_EARLYCON) | |
dc8e6f5b MD |
2895 | static void serial_console_putchar(struct uart_port *port, int ch) |
2896 | { | |
2897 | sci_poll_put_char(port, ch); | |
2898 | } | |
2899 | ||
1da177e4 LT |
2900 | /* |
2901 | * Print a string to the serial port trying not to disturb | |
2902 | * any possible real use of the port... | |
2903 | */ | |
2904 | static void serial_console_write(struct console *co, const char *s, | |
2905 | unsigned count) | |
2906 | { | |
906b17dc PM |
2907 | struct sci_port *sci_port = &sci_ports[co->index]; |
2908 | struct uart_port *port = &sci_port->port; | |
a67969b5 | 2909 | unsigned short bits, ctrl, ctrl_temp; |
40f70c03 SK |
2910 | unsigned long flags; |
2911 | int locked = 1; | |
2912 | ||
0b0cced1 | 2913 | #if defined(SUPPORT_SYSRQ) |
40f70c03 SK |
2914 | if (port->sysrq) |
2915 | locked = 0; | |
0b0cced1 YS |
2916 | else |
2917 | #endif | |
2918 | if (oops_in_progress) | |
8afb1d2c | 2919 | locked = spin_trylock_irqsave(&port->lock, flags); |
40f70c03 | 2920 | else |
8afb1d2c | 2921 | spin_lock_irqsave(&port->lock, flags); |
40f70c03 | 2922 | |
a67969b5 | 2923 | /* first save SCSCR then disable interrupts, keep clock source */ |
40f70c03 | 2924 | ctrl = serial_port_in(port, SCSCR); |
9f8325b3 LP |
2925 | ctrl_temp = SCSCR_RE | SCSCR_TE | |
2926 | (sci_port->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0)) | | |
a67969b5 | 2927 | (ctrl & (SCSCR_CKE1 | SCSCR_CKE0)); |
fa2abb03 | 2928 | serial_port_out(port, SCSCR, ctrl_temp | sci_port->hscif_tot); |
07d2a1a1 | 2929 | |
501b825d | 2930 | uart_console_write(port, s, count, serial_console_putchar); |
973e5d52 MD |
2931 | |
2932 | /* wait until fifo is empty and last bit has been transmitted */ | |
2933 | bits = SCxSR_TDxE(port) | SCxSR_TEND(port); | |
b12bb29f | 2934 | while ((serial_port_in(port, SCxSR) & bits) != bits) |
973e5d52 | 2935 | cpu_relax(); |
40f70c03 SK |
2936 | |
2937 | /* restore the SCSCR */ | |
2938 | serial_port_out(port, SCSCR, ctrl); | |
2939 | ||
2940 | if (locked) | |
8afb1d2c | 2941 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
2942 | } |
2943 | ||
9671f099 | 2944 | static int serial_console_setup(struct console *co, char *options) |
1da177e4 | 2945 | { |
dc8e6f5b | 2946 | struct sci_port *sci_port; |
1da177e4 LT |
2947 | struct uart_port *port; |
2948 | int baud = 115200; | |
2949 | int bits = 8; | |
2950 | int parity = 'n'; | |
2951 | int flow = 'n'; | |
2952 | int ret; | |
2953 | ||
e108b2ca | 2954 | /* |
906b17dc | 2955 | * Refuse to handle any bogus ports. |
1da177e4 | 2956 | */ |
906b17dc | 2957 | if (co->index < 0 || co->index >= SCI_NPORTS) |
e108b2ca | 2958 | return -ENODEV; |
e108b2ca | 2959 | |
906b17dc PM |
2960 | sci_port = &sci_ports[co->index]; |
2961 | port = &sci_port->port; | |
2962 | ||
b2267a6b AC |
2963 | /* |
2964 | * Refuse to handle uninitialized ports. | |
2965 | */ | |
2966 | if (!port->ops) | |
2967 | return -ENODEV; | |
2968 | ||
f6e9495d PM |
2969 | ret = sci_remap_port(port); |
2970 | if (unlikely(ret != 0)) | |
2971 | return ret; | |
e108b2ca | 2972 | |
1da177e4 LT |
2973 | if (options) |
2974 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2975 | ||
ab7cfb55 | 2976 | return uart_set_options(port, co, baud, parity, bits, flow); |
1da177e4 LT |
2977 | } |
2978 | ||
2979 | static struct console serial_console = { | |
2980 | .name = "ttySC", | |
906b17dc | 2981 | .device = uart_console_device, |
1da177e4 LT |
2982 | .write = serial_console_write, |
2983 | .setup = serial_console_setup, | |
fa5da2f7 | 2984 | .flags = CON_PRINTBUFFER, |
1da177e4 | 2985 | .index = -1, |
906b17dc | 2986 | .data = &sci_uart_driver, |
1da177e4 LT |
2987 | }; |
2988 | ||
7b6fd3bf MD |
2989 | static struct console early_serial_console = { |
2990 | .name = "early_ttySC", | |
2991 | .write = serial_console_write, | |
2992 | .flags = CON_PRINTBUFFER, | |
906b17dc | 2993 | .index = -1, |
7b6fd3bf | 2994 | }; |
ecdf8a46 | 2995 | |
7b6fd3bf MD |
2996 | static char early_serial_buf[32]; |
2997 | ||
9671f099 | 2998 | static int sci_probe_earlyprintk(struct platform_device *pdev) |
ecdf8a46 | 2999 | { |
daf5a895 | 3000 | const struct plat_sci_port *cfg = dev_get_platdata(&pdev->dev); |
ecdf8a46 PM |
3001 | |
3002 | if (early_serial_console.data) | |
3003 | return -EEXIST; | |
3004 | ||
3005 | early_serial_console.index = pdev->id; | |
ecdf8a46 | 3006 | |
1fcc91a6 | 3007 | sci_init_single(pdev, &sci_ports[pdev->id], pdev->id, cfg, true); |
ecdf8a46 PM |
3008 | |
3009 | serial_console_setup(&early_serial_console, early_serial_buf); | |
3010 | ||
3011 | if (!strstr(early_serial_buf, "keep")) | |
3012 | early_serial_console.flags |= CON_BOOT; | |
3013 | ||
3014 | register_console(&early_serial_console); | |
3015 | return 0; | |
3016 | } | |
6a8c9799 NI |
3017 | |
3018 | #define SCI_CONSOLE (&serial_console) | |
3019 | ||
ecdf8a46 | 3020 | #else |
9671f099 | 3021 | static inline int sci_probe_earlyprintk(struct platform_device *pdev) |
ecdf8a46 PM |
3022 | { |
3023 | return -EINVAL; | |
3024 | } | |
1da177e4 | 3025 | |
6a8c9799 NI |
3026 | #define SCI_CONSOLE NULL |
3027 | ||
0b0cced1 | 3028 | #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE || CONFIG_SERIAL_SH_SCI_EARLYCON */ |
1da177e4 | 3029 | |
6c13d5d2 | 3030 | static const char banner[] __initconst = "SuperH (H)SCI(F) driver initialized"; |
1da177e4 | 3031 | |
352b9266 | 3032 | static DEFINE_MUTEX(sci_uart_registration_lock); |
1da177e4 LT |
3033 | static struct uart_driver sci_uart_driver = { |
3034 | .owner = THIS_MODULE, | |
3035 | .driver_name = "sci", | |
1da177e4 LT |
3036 | .dev_name = "ttySC", |
3037 | .major = SCI_MAJOR, | |
3038 | .minor = SCI_MINOR_START, | |
e108b2ca | 3039 | .nr = SCI_NPORTS, |
1da177e4 LT |
3040 | .cons = SCI_CONSOLE, |
3041 | }; | |
3042 | ||
54507f6e | 3043 | static int sci_remove(struct platform_device *dev) |
e552de24 | 3044 | { |
d535a230 | 3045 | struct sci_port *port = platform_get_drvdata(dev); |
e552de24 | 3046 | |
7678f4c2 | 3047 | sci_ports_in_use &= ~BIT(port->port.line); |
d535a230 PM |
3048 | uart_remove_one_port(&sci_uart_driver, &port->port); |
3049 | ||
6dae1421 | 3050 | sci_cleanup_single(port); |
e552de24 | 3051 | |
5d23188a UH |
3052 | if (port->port.fifosize > 1) { |
3053 | sysfs_remove_file(&dev->dev.kobj, | |
3054 | &dev_attr_rx_fifo_trigger.attr); | |
3055 | } | |
fa2abb03 UH |
3056 | if (port->port.type == PORT_SCIFA || port->port.type == PORT_SCIFB || |
3057 | port->port.type == PORT_HSCIF) { | |
5d23188a UH |
3058 | sysfs_remove_file(&dev->dev.kobj, |
3059 | &dev_attr_rx_fifo_timeout.attr); | |
3060 | } | |
3061 | ||
e552de24 MD |
3062 | return 0; |
3063 | } | |
3064 | ||
bd2238fb GU |
3065 | |
3066 | #define SCI_OF_DATA(type, regtype) (void *)((type) << 16 | (regtype)) | |
3067 | #define SCI_OF_TYPE(data) ((unsigned long)(data) >> 16) | |
3068 | #define SCI_OF_REGTYPE(data) ((unsigned long)(data) & 0xffff) | |
20bdcab8 BH |
3069 | |
3070 | static const struct of_device_id of_sci_match[] = { | |
f443ff80 GU |
3071 | /* SoC-specific types */ |
3072 | { | |
3073 | .compatible = "renesas,scif-r7s72100", | |
3074 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH2_SCIF_FIFODATA_REGTYPE), | |
3075 | }, | |
9ed44bb2 GU |
3076 | /* Family-specific types */ |
3077 | { | |
3078 | .compatible = "renesas,rcar-gen1-scif", | |
3079 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH4_SCIF_BRG_REGTYPE), | |
3080 | }, { | |
3081 | .compatible = "renesas,rcar-gen2-scif", | |
3082 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH4_SCIF_BRG_REGTYPE), | |
3083 | }, { | |
3084 | .compatible = "renesas,rcar-gen3-scif", | |
3085 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH4_SCIF_BRG_REGTYPE), | |
3086 | }, | |
f443ff80 | 3087 | /* Generic types */ |
20bdcab8 BH |
3088 | { |
3089 | .compatible = "renesas,scif", | |
bd2238fb | 3090 | .data = SCI_OF_DATA(PORT_SCIF, SCIx_SH4_SCIF_REGTYPE), |
20bdcab8 BH |
3091 | }, { |
3092 | .compatible = "renesas,scifa", | |
bd2238fb | 3093 | .data = SCI_OF_DATA(PORT_SCIFA, SCIx_SCIFA_REGTYPE), |
20bdcab8 BH |
3094 | }, { |
3095 | .compatible = "renesas,scifb", | |
bd2238fb | 3096 | .data = SCI_OF_DATA(PORT_SCIFB, SCIx_SCIFB_REGTYPE), |
20bdcab8 BH |
3097 | }, { |
3098 | .compatible = "renesas,hscif", | |
bd2238fb | 3099 | .data = SCI_OF_DATA(PORT_HSCIF, SCIx_HSCIF_REGTYPE), |
e1d0be61 YS |
3100 | }, { |
3101 | .compatible = "renesas,sci", | |
bd2238fb | 3102 | .data = SCI_OF_DATA(PORT_SCI, SCIx_SCI_REGTYPE), |
20bdcab8 BH |
3103 | }, { |
3104 | /* Terminator */ | |
3105 | }, | |
3106 | }; | |
3107 | MODULE_DEVICE_TABLE(of, of_sci_match); | |
3108 | ||
54b12c48 GU |
3109 | static struct plat_sci_port *sci_parse_dt(struct platform_device *pdev, |
3110 | unsigned int *dev_id) | |
20bdcab8 BH |
3111 | { |
3112 | struct device_node *np = pdev->dev.of_node; | |
20bdcab8 | 3113 | struct plat_sci_port *p; |
97ed9790 | 3114 | struct sci_port *sp; |
6e605a01 | 3115 | const void *data; |
20bdcab8 BH |
3116 | int id; |
3117 | ||
3118 | if (!IS_ENABLED(CONFIG_OF) || !np) | |
3119 | return NULL; | |
3120 | ||
6e605a01 | 3121 | data = of_device_get_match_data(&pdev->dev); |
20bdcab8 | 3122 | |
20bdcab8 | 3123 | p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL); |
4205463c | 3124 | if (!p) |
20bdcab8 | 3125 | return NULL; |
20bdcab8 | 3126 | |
2095fc76 | 3127 | /* Get the line number from the aliases node. */ |
20bdcab8 | 3128 | id = of_alias_get_id(np, "serial"); |
7678f4c2 GU |
3129 | if (id < 0 && ~sci_ports_in_use) |
3130 | id = ffz(sci_ports_in_use); | |
20bdcab8 BH |
3131 | if (id < 0) { |
3132 | dev_err(&pdev->dev, "failed to get alias id (%d)\n", id); | |
3133 | return NULL; | |
3134 | } | |
090fa4b0 GU |
3135 | if (id >= ARRAY_SIZE(sci_ports)) { |
3136 | dev_err(&pdev->dev, "serial%d out of range\n", id); | |
3137 | return NULL; | |
3138 | } | |
20bdcab8 | 3139 | |
97ed9790 | 3140 | sp = &sci_ports[id]; |
20bdcab8 BH |
3141 | *dev_id = id; |
3142 | ||
6e605a01 GU |
3143 | p->type = SCI_OF_TYPE(data); |
3144 | p->regtype = SCI_OF_REGTYPE(data); | |
20bdcab8 | 3145 | |
43c61286 | 3146 | sp->has_rtscts = of_property_read_bool(np, "uart-has-rtscts"); |
861a70ab | 3147 | |
20bdcab8 BH |
3148 | return p; |
3149 | } | |
3150 | ||
9671f099 | 3151 | static int sci_probe_single(struct platform_device *dev, |
0ee70712 MD |
3152 | unsigned int index, |
3153 | struct plat_sci_port *p, | |
3154 | struct sci_port *sciport) | |
3155 | { | |
0ee70712 MD |
3156 | int ret; |
3157 | ||
3158 | /* Sanity check */ | |
3159 | if (unlikely(index >= SCI_NPORTS)) { | |
9b971cd2 | 3160 | dev_notice(&dev->dev, "Attempting to register port %d when only %d are available\n", |
0ee70712 | 3161 | index+1, SCI_NPORTS); |
9b971cd2 | 3162 | dev_notice(&dev->dev, "Consider bumping CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); |
b6c5ef6f | 3163 | return -EINVAL; |
0ee70712 | 3164 | } |
7678f4c2 GU |
3165 | BUILD_BUG_ON(SCI_NPORTS > sizeof(sci_ports_in_use) * 8); |
3166 | if (sci_ports_in_use & BIT(index)) | |
3167 | return -EBUSY; | |
0ee70712 | 3168 | |
352b9266 SS |
3169 | mutex_lock(&sci_uart_registration_lock); |
3170 | if (!sci_uart_driver.state) { | |
3171 | ret = uart_register_driver(&sci_uart_driver); | |
3172 | if (ret) { | |
3173 | mutex_unlock(&sci_uart_registration_lock); | |
3174 | return ret; | |
3175 | } | |
3176 | } | |
3177 | mutex_unlock(&sci_uart_registration_lock); | |
3178 | ||
1fcc91a6 | 3179 | ret = sci_init_single(dev, sciport, index, p, false); |
c7ed1ab3 PM |
3180 | if (ret) |
3181 | return ret; | |
0ee70712 | 3182 | |
f907c9ea GU |
3183 | sciport->gpios = mctrl_gpio_init(&sciport->port, 0); |
3184 | if (IS_ERR(sciport->gpios) && PTR_ERR(sciport->gpios) != -ENOSYS) | |
3185 | return PTR_ERR(sciport->gpios); | |
3186 | ||
97ed9790 | 3187 | if (sciport->has_rtscts) { |
f907c9ea GU |
3188 | if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(sciport->gpios, |
3189 | UART_GPIO_CTS)) || | |
3190 | !IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(sciport->gpios, | |
3191 | UART_GPIO_RTS))) { | |
3192 | dev_err(&dev->dev, "Conflicting RTS/CTS config\n"); | |
3193 | return -EINVAL; | |
3194 | } | |
33f50ffc | 3195 | sciport->port.flags |= UPF_HARD_FLOW; |
f907c9ea GU |
3196 | } |
3197 | ||
6dae1421 LP |
3198 | ret = uart_add_one_port(&sci_uart_driver, &sciport->port); |
3199 | if (ret) { | |
3200 | sci_cleanup_single(sciport); | |
3201 | return ret; | |
3202 | } | |
3203 | ||
3204 | return 0; | |
0ee70712 MD |
3205 | } |
3206 | ||
9671f099 | 3207 | static int sci_probe(struct platform_device *dev) |
1da177e4 | 3208 | { |
20bdcab8 BH |
3209 | struct plat_sci_port *p; |
3210 | struct sci_port *sp; | |
3211 | unsigned int dev_id; | |
ecdf8a46 | 3212 | int ret; |
d535a230 | 3213 | |
ecdf8a46 PM |
3214 | /* |
3215 | * If we've come here via earlyprintk initialization, head off to | |
3216 | * the special early probe. We don't have sufficient device state | |
3217 | * to make it beyond this yet. | |
3218 | */ | |
3219 | if (is_early_platform_device(dev)) | |
3220 | return sci_probe_earlyprintk(dev); | |
7b6fd3bf | 3221 | |
20bdcab8 BH |
3222 | if (dev->dev.of_node) { |
3223 | p = sci_parse_dt(dev, &dev_id); | |
3224 | if (p == NULL) | |
3225 | return -EINVAL; | |
3226 | } else { | |
3227 | p = dev->dev.platform_data; | |
3228 | if (p == NULL) { | |
3229 | dev_err(&dev->dev, "no platform data supplied\n"); | |
3230 | return -EINVAL; | |
3231 | } | |
3232 | ||
3233 | dev_id = dev->id; | |
3234 | } | |
3235 | ||
3236 | sp = &sci_ports[dev_id]; | |
d535a230 | 3237 | platform_set_drvdata(dev, sp); |
e552de24 | 3238 | |
20bdcab8 | 3239 | ret = sci_probe_single(dev, dev_id, p, sp); |
d535a230 | 3240 | if (ret) |
6dae1421 | 3241 | return ret; |
e552de24 | 3242 | |
5d23188a UH |
3243 | if (sp->port.fifosize > 1) { |
3244 | ret = sysfs_create_file(&dev->dev.kobj, | |
3245 | &dev_attr_rx_fifo_trigger.attr); | |
3246 | if (ret) | |
3247 | return ret; | |
3248 | } | |
fa2abb03 UH |
3249 | if (sp->port.type == PORT_SCIFA || sp->port.type == PORT_SCIFB || |
3250 | sp->port.type == PORT_HSCIF) { | |
5d23188a UH |
3251 | ret = sysfs_create_file(&dev->dev.kobj, |
3252 | &dev_attr_rx_fifo_timeout.attr); | |
3253 | if (ret) { | |
3254 | if (sp->port.fifosize > 1) { | |
3255 | sysfs_remove_file(&dev->dev.kobj, | |
3256 | &dev_attr_rx_fifo_trigger.attr); | |
3257 | } | |
3258 | return ret; | |
3259 | } | |
3260 | } | |
3261 | ||
1da177e4 LT |
3262 | #ifdef CONFIG_SH_STANDARD_BIOS |
3263 | sh_bios_gdb_detach(); | |
3264 | #endif | |
3265 | ||
7678f4c2 | 3266 | sci_ports_in_use |= BIT(dev_id); |
e108b2ca | 3267 | return 0; |
1da177e4 LT |
3268 | } |
3269 | ||
cb876341 | 3270 | static __maybe_unused int sci_suspend(struct device *dev) |
1da177e4 | 3271 | { |
d535a230 | 3272 | struct sci_port *sport = dev_get_drvdata(dev); |
e108b2ca | 3273 | |
d535a230 PM |
3274 | if (sport) |
3275 | uart_suspend_port(&sci_uart_driver, &sport->port); | |
1da177e4 | 3276 | |
e108b2ca PM |
3277 | return 0; |
3278 | } | |
1da177e4 | 3279 | |
cb876341 | 3280 | static __maybe_unused int sci_resume(struct device *dev) |
e108b2ca | 3281 | { |
d535a230 | 3282 | struct sci_port *sport = dev_get_drvdata(dev); |
e108b2ca | 3283 | |
d535a230 PM |
3284 | if (sport) |
3285 | uart_resume_port(&sci_uart_driver, &sport->port); | |
e108b2ca PM |
3286 | |
3287 | return 0; | |
3288 | } | |
3289 | ||
cb876341 | 3290 | static SIMPLE_DEV_PM_OPS(sci_dev_pm_ops, sci_suspend, sci_resume); |
6daa79b3 | 3291 | |
e108b2ca PM |
3292 | static struct platform_driver sci_driver = { |
3293 | .probe = sci_probe, | |
b9e39c89 | 3294 | .remove = sci_remove, |
e108b2ca PM |
3295 | .driver = { |
3296 | .name = "sh-sci", | |
6daa79b3 | 3297 | .pm = &sci_dev_pm_ops, |
20bdcab8 | 3298 | .of_match_table = of_match_ptr(of_sci_match), |
e108b2ca PM |
3299 | }, |
3300 | }; | |
3301 | ||
3302 | static int __init sci_init(void) | |
3303 | { | |
6c13d5d2 | 3304 | pr_info("%s\n", banner); |
e108b2ca | 3305 | |
352b9266 | 3306 | return platform_driver_register(&sci_driver); |
e108b2ca PM |
3307 | } |
3308 | ||
3309 | static void __exit sci_exit(void) | |
3310 | { | |
3311 | platform_driver_unregister(&sci_driver); | |
352b9266 SS |
3312 | |
3313 | if (sci_uart_driver.state) | |
3314 | uart_unregister_driver(&sci_uart_driver); | |
1da177e4 LT |
3315 | } |
3316 | ||
7b6fd3bf MD |
3317 | #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
3318 | early_platform_init_buffer("earlyprintk", &sci_driver, | |
3319 | early_serial_buf, ARRAY_SIZE(early_serial_buf)); | |
3320 | #endif | |
0b0cced1 | 3321 | #ifdef CONFIG_SERIAL_SH_SCI_EARLYCON |
dd076cff | 3322 | static struct plat_sci_port port_cfg __initdata; |
0b0cced1 YS |
3323 | |
3324 | static int __init early_console_setup(struct earlycon_device *device, | |
3325 | int type) | |
3326 | { | |
3327 | if (!device->port.membase) | |
3328 | return -ENODEV; | |
3329 | ||
3330 | device->port.serial_in = sci_serial_in; | |
3331 | device->port.serial_out = sci_serial_out; | |
3332 | device->port.type = type; | |
3333 | memcpy(&sci_ports[0].port, &device->port, sizeof(struct uart_port)); | |
daf5a895 | 3334 | port_cfg.type = type; |
0b0cced1 | 3335 | sci_ports[0].cfg = &port_cfg; |
daf5a895 | 3336 | sci_ports[0].params = sci_probe_regmap(&port_cfg); |
9f8325b3 LP |
3337 | port_cfg.scscr = sci_serial_in(&sci_ports[0].port, SCSCR); |
3338 | sci_serial_out(&sci_ports[0].port, SCSCR, | |
3339 | SCSCR_RE | SCSCR_TE | port_cfg.scscr); | |
0b0cced1 YS |
3340 | |
3341 | device->con->write = serial_console_write; | |
3342 | return 0; | |
3343 | } | |
3344 | static int __init sci_early_console_setup(struct earlycon_device *device, | |
3345 | const char *opt) | |
3346 | { | |
3347 | return early_console_setup(device, PORT_SCI); | |
3348 | } | |
3349 | static int __init scif_early_console_setup(struct earlycon_device *device, | |
3350 | const char *opt) | |
3351 | { | |
3352 | return early_console_setup(device, PORT_SCIF); | |
3353 | } | |
3354 | static int __init scifa_early_console_setup(struct earlycon_device *device, | |
3355 | const char *opt) | |
3356 | { | |
3357 | return early_console_setup(device, PORT_SCIFA); | |
3358 | } | |
3359 | static int __init scifb_early_console_setup(struct earlycon_device *device, | |
3360 | const char *opt) | |
3361 | { | |
3362 | return early_console_setup(device, PORT_SCIFB); | |
3363 | } | |
3364 | static int __init hscif_early_console_setup(struct earlycon_device *device, | |
3365 | const char *opt) | |
3366 | { | |
3367 | return early_console_setup(device, PORT_HSCIF); | |
3368 | } | |
3369 | ||
0b0cced1 | 3370 | OF_EARLYCON_DECLARE(sci, "renesas,sci", sci_early_console_setup); |
0b0cced1 | 3371 | OF_EARLYCON_DECLARE(scif, "renesas,scif", scif_early_console_setup); |
0b0cced1 | 3372 | OF_EARLYCON_DECLARE(scifa, "renesas,scifa", scifa_early_console_setup); |
0b0cced1 | 3373 | OF_EARLYCON_DECLARE(scifb, "renesas,scifb", scifb_early_console_setup); |
0b0cced1 YS |
3374 | OF_EARLYCON_DECLARE(hscif, "renesas,hscif", hscif_early_console_setup); |
3375 | #endif /* CONFIG_SERIAL_SH_SCI_EARLYCON */ | |
3376 | ||
1da177e4 LT |
3377 | module_init(sci_init); |
3378 | module_exit(sci_exit); | |
3379 | ||
e108b2ca | 3380 | MODULE_LICENSE("GPL"); |
e169c139 | 3381 | MODULE_ALIAS("platform:sh-sci"); |
7f405f9c | 3382 | MODULE_AUTHOR("Paul Mundt"); |
f303b364 | 3383 | MODULE_DESCRIPTION("SuperH (H)SCI(F) serial driver"); |