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Linux 4.16.11
[linux/fpc-iii.git] / drivers / tty / serial / sccnxp.c
blobd6ae3086c2a2256c5d7a8ce5c457a3e690e885b9
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * NXP (Philips) SCC+++(SCN+++) serial driver
4 *
5 * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
6 *
7 * Based on sc26xx.c, by Thomas Bogendörfer (tsbogend@alpha.franken.de)
8 */
9
10 #if defined(CONFIG_SERIAL_SCCNXP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
11 #define SUPPORT_SYSRQ
12 #endif
13
14 #include <linux/clk.h>
15 #include <linux/err.h>
16 #include <linux/module.h>
17 #include <linux/device.h>
18 #include <linux/console.h>
19 #include <linux/serial_core.h>
20 #include <linux/serial.h>
21 #include <linux/io.h>
22 #include <linux/tty.h>
23 #include <linux/tty_flip.h>
24 #include <linux/spinlock.h>
25 #include <linux/platform_device.h>
26 #include <linux/platform_data/serial-sccnxp.h>
27 #include <linux/regulator/consumer.h>
28
29 #define SCCNXP_NAME "uart-sccnxp"
30 #define SCCNXP_MAJOR 204
31 #define SCCNXP_MINOR 205
32
33 #define SCCNXP_MR_REG (0x00)
34 # define MR0_BAUD_NORMAL (0 << 0)
35 # define MR0_BAUD_EXT1 (1 << 0)
36 # define MR0_BAUD_EXT2 (5 << 0)
37 # define MR0_FIFO (1 << 3)
38 # define MR0_TXLVL (1 << 4)
39 # define MR1_BITS_5 (0 << 0)
40 # define MR1_BITS_6 (1 << 0)
41 # define MR1_BITS_7 (2 << 0)
42 # define MR1_BITS_8 (3 << 0)
43 # define MR1_PAR_EVN (0 << 2)
44 # define MR1_PAR_ODD (1 << 2)
45 # define MR1_PAR_NO (4 << 2)
46 # define MR2_STOP1 (7 << 0)
47 # define MR2_STOP2 (0xf << 0)
48 #define SCCNXP_SR_REG (0x01)
49 #define SCCNXP_CSR_REG SCCNXP_SR_REG
50 # define SR_RXRDY (1 << 0)
51 # define SR_FULL (1 << 1)
52 # define SR_TXRDY (1 << 2)
53 # define SR_TXEMT (1 << 3)
54 # define SR_OVR (1 << 4)
55 # define SR_PE (1 << 5)
56 # define SR_FE (1 << 6)
57 # define SR_BRK (1 << 7)
58 #define SCCNXP_CR_REG (0x02)
59 # define CR_RX_ENABLE (1 << 0)
60 # define CR_RX_DISABLE (1 << 1)
61 # define CR_TX_ENABLE (1 << 2)
62 # define CR_TX_DISABLE (1 << 3)
63 # define CR_CMD_MRPTR1 (0x01 << 4)
64 # define CR_CMD_RX_RESET (0x02 << 4)
65 # define CR_CMD_TX_RESET (0x03 << 4)
66 # define CR_CMD_STATUS_RESET (0x04 << 4)
67 # define CR_CMD_BREAK_RESET (0x05 << 4)
68 # define CR_CMD_START_BREAK (0x06 << 4)
69 # define CR_CMD_STOP_BREAK (0x07 << 4)
70 # define CR_CMD_MRPTR0 (0x0b << 4)
71 #define SCCNXP_RHR_REG (0x03)
72 #define SCCNXP_THR_REG SCCNXP_RHR_REG
73 #define SCCNXP_IPCR_REG (0x04)
74 #define SCCNXP_ACR_REG SCCNXP_IPCR_REG
75 # define ACR_BAUD0 (0 << 7)
76 # define ACR_BAUD1 (1 << 7)
77 # define ACR_TIMER_MODE (6 << 4)
78 #define SCCNXP_ISR_REG (0x05)
79 #define SCCNXP_IMR_REG SCCNXP_ISR_REG
80 # define IMR_TXRDY (1 << 0)
81 # define IMR_RXRDY (1 << 1)
82 # define ISR_TXRDY(x) (1 << ((x * 4) + 0))
83 # define ISR_RXRDY(x) (1 << ((x * 4) + 1))
84 #define SCCNXP_IPR_REG (0x0d)
85 #define SCCNXP_OPCR_REG SCCNXP_IPR_REG
86 #define SCCNXP_SOP_REG (0x0e)
87 #define SCCNXP_ROP_REG (0x0f)
88
89 /* Route helpers */
90 #define MCTRL_MASK(sig) (0xf << (sig))
91 #define MCTRL_IBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_IP0)
92 #define MCTRL_OBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_OP0)
93
94 #define SCCNXP_HAVE_IO 0x00000001
95 #define SCCNXP_HAVE_MR0 0x00000002
96
97 struct sccnxp_chip {
98 const char *name;
99 unsigned int nr;
100 unsigned long freq_min;
101 unsigned long freq_std;
102 unsigned long freq_max;
103 unsigned int flags;
104 unsigned int fifosize;
105 };
106
107 struct sccnxp_port {
108 struct uart_driver uart;
109 struct uart_port port[SCCNXP_MAX_UARTS];
110 bool opened[SCCNXP_MAX_UARTS];
111
112 int irq;
113 u8 imr;
114
115 struct sccnxp_chip *chip;
116
117 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
118 struct console console;
119 #endif
120
121 spinlock_t lock;
122
123 bool poll;
124 struct timer_list timer;
125
126 struct sccnxp_pdata pdata;
127
128 struct regulator *regulator;
129 };
130
131 static const struct sccnxp_chip sc2681 = {
132 .name = "SC2681",
133 .nr = 2,
134 .freq_min = 1000000,
135 .freq_std = 3686400,
136 .freq_max = 4000000,
137 .flags = SCCNXP_HAVE_IO,
138 .fifosize = 3,
139 };
140
141 static const struct sccnxp_chip sc2691 = {
142 .name = "SC2691",
143 .nr = 1,
144 .freq_min = 1000000,
145 .freq_std = 3686400,
146 .freq_max = 4000000,
147 .flags = 0,
148 .fifosize = 3,
149 };
150
151 static const struct sccnxp_chip sc2692 = {
152 .name = "SC2692",
153 .nr = 2,
154 .freq_min = 1000000,
155 .freq_std = 3686400,
156 .freq_max = 4000000,
157 .flags = SCCNXP_HAVE_IO,
158 .fifosize = 3,
159 };
160
161 static const struct sccnxp_chip sc2891 = {
162 .name = "SC2891",
163 .nr = 1,
164 .freq_min = 100000,
165 .freq_std = 3686400,
166 .freq_max = 8000000,
167 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
168 .fifosize = 16,
169 };
170
171 static const struct sccnxp_chip sc2892 = {
172 .name = "SC2892",
173 .nr = 2,
174 .freq_min = 100000,
175 .freq_std = 3686400,
176 .freq_max = 8000000,
177 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
178 .fifosize = 16,
179 };
180
181 static const struct sccnxp_chip sc28202 = {
182 .name = "SC28202",
183 .nr = 2,
184 .freq_min = 1000000,
185 .freq_std = 14745600,
186 .freq_max = 50000000,
187 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
188 .fifosize = 256,
189 };
190
191 static const struct sccnxp_chip sc68681 = {
192 .name = "SC68681",
193 .nr = 2,
194 .freq_min = 1000000,
195 .freq_std = 3686400,
196 .freq_max = 4000000,
197 .flags = SCCNXP_HAVE_IO,
198 .fifosize = 3,
199 };
200
201 static const struct sccnxp_chip sc68692 = {
202 .name = "SC68692",
203 .nr = 2,
204 .freq_min = 1000000,
205 .freq_std = 3686400,
206 .freq_max = 4000000,
207 .flags = SCCNXP_HAVE_IO,
208 .fifosize = 3,
209 };
210
211 static inline u8 sccnxp_read(struct uart_port *port, u8 reg)
212 {
213 return readb(port->membase + (reg << port->regshift));
214 }
215
216 static inline void sccnxp_write(struct uart_port *port, u8 reg, u8 v)
217 {
218 writeb(v, port->membase + (reg << port->regshift));
219 }
220
221 static inline u8 sccnxp_port_read(struct uart_port *port, u8 reg)
222 {
223 return sccnxp_read(port, (port->line << 3) + reg);
224 }
225
226 static inline void sccnxp_port_write(struct uart_port *port, u8 reg, u8 v)
227 {
228 sccnxp_write(port, (port->line << 3) + reg, v);
229 }
230
231 static int sccnxp_update_best_err(int a, int b, int *besterr)
232 {
233 int err = abs(a - b);
234
235 if ((*besterr < 0) || (*besterr > err)) {
236 *besterr = err;
237 return 0;
238 }
239
240 return 1;
241 }
242
243 static const struct {
244 u8 csr;
245 u8 acr;
246 u8 mr0;
247 int baud;
248 } baud_std[] = {
249 { 0, ACR_BAUD0, MR0_BAUD_NORMAL, 50, },
250 { 0, ACR_BAUD1, MR0_BAUD_NORMAL, 75, },
251 { 1, ACR_BAUD0, MR0_BAUD_NORMAL, 110, },
252 { 2, ACR_BAUD0, MR0_BAUD_NORMAL, 134, },
253 { 3, ACR_BAUD1, MR0_BAUD_NORMAL, 150, },
254 { 3, ACR_BAUD0, MR0_BAUD_NORMAL, 200, },
255 { 4, ACR_BAUD0, MR0_BAUD_NORMAL, 300, },
256 { 0, ACR_BAUD1, MR0_BAUD_EXT1, 450, },
257 { 1, ACR_BAUD0, MR0_BAUD_EXT2, 880, },
258 { 3, ACR_BAUD1, MR0_BAUD_EXT1, 900, },
259 { 5, ACR_BAUD0, MR0_BAUD_NORMAL, 600, },
260 { 7, ACR_BAUD0, MR0_BAUD_NORMAL, 1050, },
261 { 2, ACR_BAUD0, MR0_BAUD_EXT2, 1076, },
262 { 6, ACR_BAUD0, MR0_BAUD_NORMAL, 1200, },
263 { 10, ACR_BAUD1, MR0_BAUD_NORMAL, 1800, },
264 { 7, ACR_BAUD1, MR0_BAUD_NORMAL, 2000, },
265 { 8, ACR_BAUD0, MR0_BAUD_NORMAL, 2400, },
266 { 5, ACR_BAUD1, MR0_BAUD_EXT1, 3600, },
267 { 9, ACR_BAUD0, MR0_BAUD_NORMAL, 4800, },
268 { 10, ACR_BAUD0, MR0_BAUD_NORMAL, 7200, },
269 { 11, ACR_BAUD0, MR0_BAUD_NORMAL, 9600, },
270 { 8, ACR_BAUD0, MR0_BAUD_EXT1, 14400, },
271 { 12, ACR_BAUD1, MR0_BAUD_NORMAL, 19200, },
272 { 9, ACR_BAUD0, MR0_BAUD_EXT1, 28800, },
273 { 12, ACR_BAUD0, MR0_BAUD_NORMAL, 38400, },
274 { 11, ACR_BAUD0, MR0_BAUD_EXT1, 57600, },
275 { 12, ACR_BAUD1, MR0_BAUD_EXT1, 115200, },
276 { 12, ACR_BAUD0, MR0_BAUD_EXT1, 230400, },
277 { 0, 0, 0, 0 }
278 };
279
280 static int sccnxp_set_baud(struct uart_port *port, int baud)
281 {
282 struct sccnxp_port *s = dev_get_drvdata(port->dev);
283 int div_std, tmp_baud, bestbaud = baud, besterr = -1;
284 struct sccnxp_chip *chip = s->chip;
285 u8 i, acr = 0, csr = 0, mr0 = 0;
286
287 /* Find best baud from table */
288 for (i = 0; baud_std[i].baud && besterr; i++) {
289 if (baud_std[i].mr0 && !(chip->flags & SCCNXP_HAVE_MR0))
290 continue;
291 div_std = DIV_ROUND_CLOSEST(chip->freq_std, baud_std[i].baud);
292 tmp_baud = DIV_ROUND_CLOSEST(port->uartclk, div_std);
293 if (!sccnxp_update_best_err(baud, tmp_baud, &besterr)) {
294 acr = baud_std[i].acr;
295 csr = baud_std[i].csr;
296 mr0 = baud_std[i].mr0;
297 bestbaud = tmp_baud;
298 }
299 }
300
301 if (chip->flags & SCCNXP_HAVE_MR0) {
302 /* Enable FIFO, set half level for TX */
303 mr0 |= MR0_FIFO | MR0_TXLVL;
304 /* Update MR0 */
305 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR0);
306 sccnxp_port_write(port, SCCNXP_MR_REG, mr0);
307 }
308
309 sccnxp_port_write(port, SCCNXP_ACR_REG, acr | ACR_TIMER_MODE);
310 sccnxp_port_write(port, SCCNXP_CSR_REG, (csr << 4) | csr);
311
312 if (baud != bestbaud)
313 dev_dbg(port->dev, "Baudrate desired: %i, calculated: %i\n",
314 baud, bestbaud);
315
316 return bestbaud;
317 }
318
319 static void sccnxp_enable_irq(struct uart_port *port, int mask)
320 {
321 struct sccnxp_port *s = dev_get_drvdata(port->dev);
322
323 s->imr |= mask << (port->line * 4);
324 sccnxp_write(port, SCCNXP_IMR_REG, s->imr);
325 }
326
327 static void sccnxp_disable_irq(struct uart_port *port, int mask)
328 {
329 struct sccnxp_port *s = dev_get_drvdata(port->dev);
330
331 s->imr &= ~(mask << (port->line * 4));
332 sccnxp_write(port, SCCNXP_IMR_REG, s->imr);
333 }
334
335 static void sccnxp_set_bit(struct uart_port *port, int sig, int state)
336 {
337 u8 bitmask;
338 struct sccnxp_port *s = dev_get_drvdata(port->dev);
339
340 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(sig)) {
341 bitmask = 1 << MCTRL_OBIT(s->pdata.mctrl_cfg[port->line], sig);
342 if (state)
343 sccnxp_write(port, SCCNXP_SOP_REG, bitmask);
344 else
345 sccnxp_write(port, SCCNXP_ROP_REG, bitmask);
346 }
347 }
348
349 static void sccnxp_handle_rx(struct uart_port *port)
350 {
351 u8 sr;
352 unsigned int ch, flag;
353
354 for (;;) {
355 sr = sccnxp_port_read(port, SCCNXP_SR_REG);
356 if (!(sr & SR_RXRDY))
357 break;
358 sr &= SR_PE | SR_FE | SR_OVR | SR_BRK;
359
360 ch = sccnxp_port_read(port, SCCNXP_RHR_REG);
361
362 port->icount.rx++;
363 flag = TTY_NORMAL;
364
365 if (unlikely(sr)) {
366 if (sr & SR_BRK) {
367 port->icount.brk++;
368 sccnxp_port_write(port, SCCNXP_CR_REG,
369 CR_CMD_BREAK_RESET);
370 if (uart_handle_break(port))
371 continue;
372 } else if (sr & SR_PE)
373 port->icount.parity++;
374 else if (sr & SR_FE)
375 port->icount.frame++;
376 else if (sr & SR_OVR) {
377 port->icount.overrun++;
378 sccnxp_port_write(port, SCCNXP_CR_REG,
379 CR_CMD_STATUS_RESET);
380 }
381
382 sr &= port->read_status_mask;
383 if (sr & SR_BRK)
384 flag = TTY_BREAK;
385 else if (sr & SR_PE)
386 flag = TTY_PARITY;
387 else if (sr & SR_FE)
388 flag = TTY_FRAME;
389 else if (sr & SR_OVR)
390 flag = TTY_OVERRUN;
391 }
392
393 if (uart_handle_sysrq_char(port, ch))
394 continue;
395
396 if (sr & port->ignore_status_mask)
397 continue;
398
399 uart_insert_char(port, sr, SR_OVR, ch, flag);
400 }
401
402 tty_flip_buffer_push(&port->state->port);
403 }
404
405 static void sccnxp_handle_tx(struct uart_port *port)
406 {
407 u8 sr;
408 struct circ_buf *xmit = &port->state->xmit;
409 struct sccnxp_port *s = dev_get_drvdata(port->dev);
410
411 if (unlikely(port->x_char)) {
412 sccnxp_port_write(port, SCCNXP_THR_REG, port->x_char);
413 port->icount.tx++;
414 port->x_char = 0;
415 return;
416 }
417
418 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
419 /* Disable TX if FIFO is empty */
420 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXEMT) {
421 sccnxp_disable_irq(port, IMR_TXRDY);
422
423 /* Set direction to input */
424 if (s->chip->flags & SCCNXP_HAVE_IO)
425 sccnxp_set_bit(port, DIR_OP, 0);
426 }
427 return;
428 }
429
430 while (!uart_circ_empty(xmit)) {
431 sr = sccnxp_port_read(port, SCCNXP_SR_REG);
432 if (!(sr & SR_TXRDY))
433 break;
434
435 sccnxp_port_write(port, SCCNXP_THR_REG, xmit->buf[xmit->tail]);
436 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
437 port->icount.tx++;
438 }
439
440 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
441 uart_write_wakeup(port);
442 }
443
444 static void sccnxp_handle_events(struct sccnxp_port *s)
445 {
446 int i;
447 u8 isr;
448
449 do {
450 isr = sccnxp_read(&s->port[0], SCCNXP_ISR_REG);
451 isr &= s->imr;
452 if (!isr)
453 break;
454
455 for (i = 0; i < s->uart.nr; i++) {
456 if (s->opened[i] && (isr & ISR_RXRDY(i)))
457 sccnxp_handle_rx(&s->port[i]);
458 if (s->opened[i] && (isr & ISR_TXRDY(i)))
459 sccnxp_handle_tx(&s->port[i]);
460 }
461 } while (1);
462 }
463
464 static void sccnxp_timer(struct timer_list *t)
465 {
466 struct sccnxp_port *s = from_timer(s, t, timer);
467 unsigned long flags;
468
469 spin_lock_irqsave(&s->lock, flags);
470 sccnxp_handle_events(s);
471 spin_unlock_irqrestore(&s->lock, flags);
472
473 mod_timer(&s->timer, jiffies + usecs_to_jiffies(s->pdata.poll_time_us));
474 }
475
476 static irqreturn_t sccnxp_ist(int irq, void *dev_id)
477 {
478 struct sccnxp_port *s = (struct sccnxp_port *)dev_id;
479 unsigned long flags;
480
481 spin_lock_irqsave(&s->lock, flags);
482 sccnxp_handle_events(s);
483 spin_unlock_irqrestore(&s->lock, flags);
484
485 return IRQ_HANDLED;
486 }
487
488 static void sccnxp_start_tx(struct uart_port *port)
489 {
490 struct sccnxp_port *s = dev_get_drvdata(port->dev);
491 unsigned long flags;
492
493 spin_lock_irqsave(&s->lock, flags);
494
495 /* Set direction to output */
496 if (s->chip->flags & SCCNXP_HAVE_IO)
497 sccnxp_set_bit(port, DIR_OP, 1);
498
499 sccnxp_enable_irq(port, IMR_TXRDY);
500
501 spin_unlock_irqrestore(&s->lock, flags);
502 }
503
504 static void sccnxp_stop_tx(struct uart_port *port)
505 {
506 /* Do nothing */
507 }
508
509 static void sccnxp_stop_rx(struct uart_port *port)
510 {
511 struct sccnxp_port *s = dev_get_drvdata(port->dev);
512 unsigned long flags;
513
514 spin_lock_irqsave(&s->lock, flags);
515 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE);
516 spin_unlock_irqrestore(&s->lock, flags);
517 }
518
519 static unsigned int sccnxp_tx_empty(struct uart_port *port)
520 {
521 u8 val;
522 unsigned long flags;
523 struct sccnxp_port *s = dev_get_drvdata(port->dev);
524
525 spin_lock_irqsave(&s->lock, flags);
526 val = sccnxp_port_read(port, SCCNXP_SR_REG);
527 spin_unlock_irqrestore(&s->lock, flags);
528
529 return (val & SR_TXEMT) ? TIOCSER_TEMT : 0;
530 }
531
532 static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl)
533 {
534 struct sccnxp_port *s = dev_get_drvdata(port->dev);
535 unsigned long flags;
536
537 if (!(s->chip->flags & SCCNXP_HAVE_IO))
538 return;
539
540 spin_lock_irqsave(&s->lock, flags);
541
542 sccnxp_set_bit(port, DTR_OP, mctrl & TIOCM_DTR);
543 sccnxp_set_bit(port, RTS_OP, mctrl & TIOCM_RTS);
544
545 spin_unlock_irqrestore(&s->lock, flags);
546 }
547
548 static unsigned int sccnxp_get_mctrl(struct uart_port *port)
549 {
550 u8 bitmask, ipr;
551 unsigned long flags;
552 struct sccnxp_port *s = dev_get_drvdata(port->dev);
553 unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
554
555 if (!(s->chip->flags & SCCNXP_HAVE_IO))
556 return mctrl;
557
558 spin_lock_irqsave(&s->lock, flags);
559
560 ipr = ~sccnxp_read(port, SCCNXP_IPCR_REG);
561
562 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DSR_IP)) {
563 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
564 DSR_IP);
565 mctrl &= ~TIOCM_DSR;
566 mctrl |= (ipr & bitmask) ? TIOCM_DSR : 0;
567 }
568 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(CTS_IP)) {
569 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
570 CTS_IP);
571 mctrl &= ~TIOCM_CTS;
572 mctrl |= (ipr & bitmask) ? TIOCM_CTS : 0;
573 }
574 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DCD_IP)) {
575 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
576 DCD_IP);
577 mctrl &= ~TIOCM_CAR;
578 mctrl |= (ipr & bitmask) ? TIOCM_CAR : 0;
579 }
580 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(RNG_IP)) {
581 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
582 RNG_IP);
583 mctrl &= ~TIOCM_RNG;
584 mctrl |= (ipr & bitmask) ? TIOCM_RNG : 0;
585 }
586
587 spin_unlock_irqrestore(&s->lock, flags);
588
589 return mctrl;
590 }
591
592 static void sccnxp_break_ctl(struct uart_port *port, int break_state)
593 {
594 struct sccnxp_port *s = dev_get_drvdata(port->dev);
595 unsigned long flags;
596
597 spin_lock_irqsave(&s->lock, flags);
598 sccnxp_port_write(port, SCCNXP_CR_REG, break_state ?
599 CR_CMD_START_BREAK : CR_CMD_STOP_BREAK);
600 spin_unlock_irqrestore(&s->lock, flags);
601 }
602
603 static void sccnxp_set_termios(struct uart_port *port,
604 struct ktermios *termios, struct ktermios *old)
605 {
606 struct sccnxp_port *s = dev_get_drvdata(port->dev);
607 unsigned long flags;
608 u8 mr1, mr2;
609 int baud;
610
611 spin_lock_irqsave(&s->lock, flags);
612
613 /* Mask termios capabilities we don't support */
614 termios->c_cflag &= ~CMSPAR;
615
616 /* Disable RX & TX, reset break condition, status and FIFOs */
617 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET |
618 CR_RX_DISABLE | CR_TX_DISABLE);
619 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET);
620 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET);
621 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET);
622
623 /* Word size */
624 switch (termios->c_cflag & CSIZE) {
625 case CS5:
626 mr1 = MR1_BITS_5;
627 break;
628 case CS6:
629 mr1 = MR1_BITS_6;
630 break;
631 case CS7:
632 mr1 = MR1_BITS_7;
633 break;
634 case CS8:
635 default:
636 mr1 = MR1_BITS_8;
637 break;
638 }
639
640 /* Parity */
641 if (termios->c_cflag & PARENB) {
642 if (termios->c_cflag & PARODD)
643 mr1 |= MR1_PAR_ODD;
644 } else
645 mr1 |= MR1_PAR_NO;
646
647 /* Stop bits */
648 mr2 = (termios->c_cflag & CSTOPB) ? MR2_STOP2 : MR2_STOP1;
649
650 /* Update desired format */
651 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR1);
652 sccnxp_port_write(port, SCCNXP_MR_REG, mr1);
653 sccnxp_port_write(port, SCCNXP_MR_REG, mr2);
654
655 /* Set read status mask */
656 port->read_status_mask = SR_OVR;
657 if (termios->c_iflag & INPCK)
658 port->read_status_mask |= SR_PE | SR_FE;
659 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
660 port->read_status_mask |= SR_BRK;
661
662 /* Set status ignore mask */
663 port->ignore_status_mask = 0;
664 if (termios->c_iflag & IGNBRK)
665 port->ignore_status_mask |= SR_BRK;
666 if (termios->c_iflag & IGNPAR)
667 port->ignore_status_mask |= SR_PE;
668 if (!(termios->c_cflag & CREAD))
669 port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK;
670
671 /* Setup baudrate */
672 baud = uart_get_baud_rate(port, termios, old, 50,
673 (s->chip->flags & SCCNXP_HAVE_MR0) ?
674 230400 : 38400);
675 baud = sccnxp_set_baud(port, baud);
676
677 /* Update timeout according to new baud rate */
678 uart_update_timeout(port, termios->c_cflag, baud);
679
680 /* Report actual baudrate back to core */
681 if (tty_termios_baud_rate(termios))
682 tty_termios_encode_baud_rate(termios, baud, baud);
683
684 /* Enable RX & TX */
685 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE);
686
687 spin_unlock_irqrestore(&s->lock, flags);
688 }
689
690 static int sccnxp_startup(struct uart_port *port)
691 {
692 struct sccnxp_port *s = dev_get_drvdata(port->dev);
693 unsigned long flags;
694
695 spin_lock_irqsave(&s->lock, flags);
696
697 if (s->chip->flags & SCCNXP_HAVE_IO) {
698 /* Outputs are controlled manually */
699 sccnxp_write(port, SCCNXP_OPCR_REG, 0);
700 }
701
702 /* Reset break condition, status and FIFOs */
703 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET);
704 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET);
705 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET);
706 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET);
707
708 /* Enable RX & TX */
709 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE);
710
711 /* Enable RX interrupt */
712 sccnxp_enable_irq(port, IMR_RXRDY);
713
714 s->opened[port->line] = 1;
715
716 spin_unlock_irqrestore(&s->lock, flags);
717
718 return 0;
719 }
720
721 static void sccnxp_shutdown(struct uart_port *port)
722 {
723 struct sccnxp_port *s = dev_get_drvdata(port->dev);
724 unsigned long flags;
725
726 spin_lock_irqsave(&s->lock, flags);
727
728 s->opened[port->line] = 0;
729
730 /* Disable interrupts */
731 sccnxp_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
732
733 /* Disable TX & RX */
734 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE | CR_TX_DISABLE);
735
736 /* Leave direction to input */
737 if (s->chip->flags & SCCNXP_HAVE_IO)
738 sccnxp_set_bit(port, DIR_OP, 0);
739
740 spin_unlock_irqrestore(&s->lock, flags);
741 }
742
743 static const char *sccnxp_type(struct uart_port *port)
744 {
745 struct sccnxp_port *s = dev_get_drvdata(port->dev);
746
747 return (port->type == PORT_SC26XX) ? s->chip->name : NULL;
748 }
749
750 static void sccnxp_release_port(struct uart_port *port)
751 {
752 /* Do nothing */
753 }
754
755 static int sccnxp_request_port(struct uart_port *port)
756 {
757 /* Do nothing */
758 return 0;
759 }
760
761 static void sccnxp_config_port(struct uart_port *port, int flags)
762 {
763 if (flags & UART_CONFIG_TYPE)
764 port->type = PORT_SC26XX;
765 }
766
767 static int sccnxp_verify_port(struct uart_port *port, struct serial_struct *s)
768 {
769 if ((s->type == PORT_UNKNOWN) || (s->type == PORT_SC26XX))
770 return 0;
771 if (s->irq == port->irq)
772 return 0;
773
774 return -EINVAL;
775 }
776
777 static const struct uart_ops sccnxp_ops = {
778 .tx_empty = sccnxp_tx_empty,
779 .set_mctrl = sccnxp_set_mctrl,
780 .get_mctrl = sccnxp_get_mctrl,
781 .stop_tx = sccnxp_stop_tx,
782 .start_tx = sccnxp_start_tx,
783 .stop_rx = sccnxp_stop_rx,
784 .break_ctl = sccnxp_break_ctl,
785 .startup = sccnxp_startup,
786 .shutdown = sccnxp_shutdown,
787 .set_termios = sccnxp_set_termios,
788 .type = sccnxp_type,
789 .release_port = sccnxp_release_port,
790 .request_port = sccnxp_request_port,
791 .config_port = sccnxp_config_port,
792 .verify_port = sccnxp_verify_port,
793 };
794
795 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
796 static void sccnxp_console_putchar(struct uart_port *port, int c)
797 {
798 int tryes = 100000;
799
800 while (tryes--) {
801 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXRDY) {
802 sccnxp_port_write(port, SCCNXP_THR_REG, c);
803 break;
804 }
805 barrier();
806 }
807 }
808
809 static void sccnxp_console_write(struct console *co, const char *c, unsigned n)
810 {
811 struct sccnxp_port *s = (struct sccnxp_port *)co->data;
812 struct uart_port *port = &s->port[co->index];
813 unsigned long flags;
814
815 spin_lock_irqsave(&s->lock, flags);
816 uart_console_write(port, c, n, sccnxp_console_putchar);
817 spin_unlock_irqrestore(&s->lock, flags);
818 }
819
820 static int sccnxp_console_setup(struct console *co, char *options)
821 {
822 struct sccnxp_port *s = (struct sccnxp_port *)co->data;
823 struct uart_port *port = &s->port[(co->index > 0) ? co->index : 0];
824 int baud = 9600, bits = 8, parity = 'n', flow = 'n';
825
826 if (options)
827 uart_parse_options(options, &baud, &parity, &bits, &flow);
828
829 return uart_set_options(port, co, baud, parity, bits, flow);
830 }
831 #endif
832
833 static const struct platform_device_id sccnxp_id_table[] = {
834 { .name = "sc2681", .driver_data = (kernel_ulong_t)&sc2681, },
835 { .name = "sc2691", .driver_data = (kernel_ulong_t)&sc2691, },
836 { .name = "sc2692", .driver_data = (kernel_ulong_t)&sc2692, },
837 { .name = "sc2891", .driver_data = (kernel_ulong_t)&sc2891, },
838 { .name = "sc2892", .driver_data = (kernel_ulong_t)&sc2892, },
839 { .name = "sc28202", .driver_data = (kernel_ulong_t)&sc28202, },
840 { .name = "sc68681", .driver_data = (kernel_ulong_t)&sc68681, },
841 { .name = "sc68692", .driver_data = (kernel_ulong_t)&sc68692, },
842 { }
843 };
844 MODULE_DEVICE_TABLE(platform, sccnxp_id_table);
845
846 static int sccnxp_probe(struct platform_device *pdev)
847 {
848 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
849 struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev);
850 int i, ret, uartclk;
851 struct sccnxp_port *s;
852 void __iomem *membase;
853 struct clk *clk;
854
855 membase = devm_ioremap_resource(&pdev->dev, res);
856 if (IS_ERR(membase))
857 return PTR_ERR(membase);
858
859 s = devm_kzalloc(&pdev->dev, sizeof(struct sccnxp_port), GFP_KERNEL);
860 if (!s) {
861 dev_err(&pdev->dev, "Error allocating port structure\n");
862 return -ENOMEM;
863 }
864 platform_set_drvdata(pdev, s);
865
866 spin_lock_init(&s->lock);
867
868 s->chip = (struct sccnxp_chip *)pdev->id_entry->driver_data;
869
870 s->regulator = devm_regulator_get(&pdev->dev, "vcc");
871 if (!IS_ERR(s->regulator)) {
872 ret = regulator_enable(s->regulator);
873 if (ret) {
874 dev_err(&pdev->dev,
875 "Failed to enable regulator: %i\n", ret);
876 return ret;
877 }
878 } else if (PTR_ERR(s->regulator) == -EPROBE_DEFER)
879 return -EPROBE_DEFER;
880
881 clk = devm_clk_get(&pdev->dev, NULL);
882 if (IS_ERR(clk)) {
883 ret = PTR_ERR(clk);
884 if (ret == -EPROBE_DEFER)
885 goto err_out;
886 uartclk = 0;
887 } else {
888 ret = clk_prepare_enable(clk);
889 if (ret)
890 goto err_out;
891
892 ret = devm_add_action_or_reset(&pdev->dev,
893 (void(*)(void *))clk_disable_unprepare,
894 clk);
895 if (ret)
896 goto err_out;
897
898 uartclk = clk_get_rate(clk);
899 }
900
901 if (!uartclk) {
902 dev_notice(&pdev->dev, "Using default clock frequency\n");
903 uartclk = s->chip->freq_std;
904 }
905
906 /* Check input frequency */
907 if ((uartclk < s->chip->freq_min) || (uartclk > s->chip->freq_max)) {
908 dev_err(&pdev->dev, "Frequency out of bounds\n");
909 ret = -EINVAL;
910 goto err_out;
911 }
912
913 if (pdata)
914 memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));
915
916 if (s->pdata.poll_time_us) {
917 dev_info(&pdev->dev, "Using poll mode, resolution %u usecs\n",
918 s->pdata.poll_time_us);
919 s->poll = 1;
920 }
921
922 if (!s->poll) {
923 s->irq = platform_get_irq(pdev, 0);
924 if (s->irq < 0) {
925 dev_err(&pdev->dev, "Missing irq resource data\n");
926 ret = -ENXIO;
927 goto err_out;
928 }
929 }
930
931 s->uart.owner = THIS_MODULE;
932 s->uart.dev_name = "ttySC";
933 s->uart.major = SCCNXP_MAJOR;
934 s->uart.minor = SCCNXP_MINOR;
935 s->uart.nr = s->chip->nr;
936 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
937 s->uart.cons = &s->console;
938 s->uart.cons->device = uart_console_device;
939 s->uart.cons->write = sccnxp_console_write;
940 s->uart.cons->setup = sccnxp_console_setup;
941 s->uart.cons->flags = CON_PRINTBUFFER;
942 s->uart.cons->index = -1;
943 s->uart.cons->data = s;
944 strcpy(s->uart.cons->name, "ttySC");
945 #endif
946 ret = uart_register_driver(&s->uart);
947 if (ret) {
948 dev_err(&pdev->dev, "Registering UART driver failed\n");
949 goto err_out;
950 }
951
952 for (i = 0; i < s->uart.nr; i++) {
953 s->port[i].line = i;
954 s->port[i].dev = &pdev->dev;
955 s->port[i].irq = s->irq;
956 s->port[i].type = PORT_SC26XX;
957 s->port[i].fifosize = s->chip->fifosize;
958 s->port[i].flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
959 s->port[i].iotype = UPIO_MEM;
960 s->port[i].mapbase = res->start;
961 s->port[i].membase = membase;
962 s->port[i].regshift = s->pdata.reg_shift;
963 s->port[i].uartclk = uartclk;
964 s->port[i].ops = &sccnxp_ops;
965 uart_add_one_port(&s->uart, &s->port[i]);
966 /* Set direction to input */
967 if (s->chip->flags & SCCNXP_HAVE_IO)
968 sccnxp_set_bit(&s->port[i], DIR_OP, 0);
969 }
970
971 /* Disable interrupts */
972 s->imr = 0;
973 sccnxp_write(&s->port[0], SCCNXP_IMR_REG, 0);
974
975 if (!s->poll) {
976 ret = devm_request_threaded_irq(&pdev->dev, s->irq, NULL,
977 sccnxp_ist,
978 IRQF_TRIGGER_FALLING |
979 IRQF_ONESHOT,
980 dev_name(&pdev->dev), s);
981 if (!ret)
982 return 0;
983
984 dev_err(&pdev->dev, "Unable to reguest IRQ %i\n", s->irq);
985 } else {
986 timer_setup(&s->timer, sccnxp_timer, 0);
987 mod_timer(&s->timer, jiffies +
988 usecs_to_jiffies(s->pdata.poll_time_us));
989 return 0;
990 }
991
992 uart_unregister_driver(&s->uart);
993 err_out:
994 if (!IS_ERR(s->regulator))
995 regulator_disable(s->regulator);
996
997 return ret;
998 }
999
1000 static int sccnxp_remove(struct platform_device *pdev)
1001 {
1002 int i;
1003 struct sccnxp_port *s = platform_get_drvdata(pdev);
1004
1005 if (!s->poll)
1006 devm_free_irq(&pdev->dev, s->irq, s);
1007 else
1008 del_timer_sync(&s->timer);
1009
1010 for (i = 0; i < s->uart.nr; i++)
1011 uart_remove_one_port(&s->uart, &s->port[i]);
1012
1013 uart_unregister_driver(&s->uart);
1014
1015 if (!IS_ERR(s->regulator))
1016 return regulator_disable(s->regulator);
1017
1018 return 0;
1019 }
1020
1021 static struct platform_driver sccnxp_uart_driver = {
1022 .driver = {
1023 .name = SCCNXP_NAME,
1024 },
1025 .probe = sccnxp_probe,
1026 .remove = sccnxp_remove,
1027 .id_table = sccnxp_id_table,
1028 };
1029 module_platform_driver(sccnxp_uart_driver);
1030
1031 MODULE_LICENSE("GPL v2");
1032 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
1033 MODULE_DESCRIPTION("SCCNXP serial driver");
Linux with added FPC-III support