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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#include <linux/clk.h>
11#include <linux/delay.h>
12#include <linux/err.h>
13#include <linux/module.h>
14#include <linux/mod_devicetable.h>
15#include <linux/device.h>
16#include <linux/console.h>
17#include <linux/serial_core.h>
18#include <linux/serial.h>
19#include <linux/io.h>
20#include <linux/tty.h>
21#include <linux/tty_flip.h>
22#include <linux/spinlock.h>
23#include <linux/platform_device.h>
24#include <linux/platform_data/serial-sccnxp.h>
25#include <linux/regulator/consumer.h>
26
27#define SCCNXP_NAME "uart-sccnxp"
28#define SCCNXP_MAJOR 204
29#define SCCNXP_MINOR 205
30
31#define SCCNXP_MR_REG (0x00)
32# define MR0_BAUD_NORMAL (0 << 0)
33# define MR0_BAUD_EXT1 (1 << 0)
34# define MR0_BAUD_EXT2 (5 << 0)
35# define MR0_FIFO (1 << 3)
36# define MR0_TXLVL (1 << 4)
37# define MR1_BITS_5 (0 << 0)
38# define MR1_BITS_6 (1 << 0)
39# define MR1_BITS_7 (2 << 0)
40# define MR1_BITS_8 (3 << 0)
41# define MR1_PAR_EVN (0 << 2)
42# define MR1_PAR_ODD (1 << 2)
43# define MR1_PAR_NO (4 << 2)
44# define MR2_STOP1 (7 << 0)
45# define MR2_STOP2 (0xf << 0)
46#define SCCNXP_SR_REG (0x01)
47# define SR_RXRDY (1 << 0)
48# define SR_FULL (1 << 1)
49# define SR_TXRDY (1 << 2)
50# define SR_TXEMT (1 << 3)
51# define SR_OVR (1 << 4)
52# define SR_PE (1 << 5)
53# define SR_FE (1 << 6)
54# define SR_BRK (1 << 7)
55#define SCCNXP_CSR_REG (SCCNXP_SR_REG)
56# define CSR_TIMER_MODE (0x0d)
57#define SCCNXP_CR_REG (0x02)
58# define CR_RX_ENABLE (1 << 0)
59# define CR_RX_DISABLE (1 << 1)
60# define CR_TX_ENABLE (1 << 2)
61# define CR_TX_DISABLE (1 << 3)
62# define CR_CMD_MRPTR1 (0x01 << 4)
63# define CR_CMD_RX_RESET (0x02 << 4)
64# define CR_CMD_TX_RESET (0x03 << 4)
65# define CR_CMD_STATUS_RESET (0x04 << 4)
66# define CR_CMD_BREAK_RESET (0x05 << 4)
67# define CR_CMD_START_BREAK (0x06 << 4)
68# define CR_CMD_STOP_BREAK (0x07 << 4)
69# define CR_CMD_MRPTR0 (0x0b << 4)
70#define SCCNXP_RHR_REG (0x03)
71#define SCCNXP_THR_REG SCCNXP_RHR_REG
72#define SCCNXP_IPCR_REG (0x04)
73#define SCCNXP_ACR_REG SCCNXP_IPCR_REG
74# define ACR_BAUD0 (0 << 7)
75# define ACR_BAUD1 (1 << 7)
76# define ACR_TIMER_MODE (6 << 4)
77#define SCCNXP_ISR_REG (0x05)
78#define SCCNXP_IMR_REG SCCNXP_ISR_REG
79# define IMR_TXRDY (1 << 0)
80# define IMR_RXRDY (1 << 1)
81# define ISR_TXRDY(x) (1 << ((x * 4) + 0))
82# define ISR_RXRDY(x) (1 << ((x * 4) + 1))
83#define SCCNXP_CTPU_REG (0x06)
84#define SCCNXP_CTPL_REG (0x07)
85#define SCCNXP_IPR_REG (0x0d)
86#define SCCNXP_OPCR_REG SCCNXP_IPR_REG
87#define SCCNXP_SOP_REG (0x0e)
88#define SCCNXP_START_COUNTER_REG SCCNXP_SOP_REG
89#define SCCNXP_ROP_REG (0x0f)
90
91/* Route helpers */
92#define MCTRL_MASK(sig) (0xf << (sig))
93#define MCTRL_IBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_IP0)
94#define MCTRL_OBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_OP0)
95
96#define SCCNXP_HAVE_IO 0x00000001
97#define SCCNXP_HAVE_MR0 0x00000002
98
99struct sccnxp_chip {
100 const char *name;
101 unsigned int nr;
102 unsigned long freq_min;
103 unsigned long freq_std;
104 unsigned long freq_max;
105 unsigned int flags;
106 unsigned int fifosize;
107 /* Time between read/write cycles */
108 unsigned int trwd;
109};
110
111struct sccnxp_port {
112 struct uart_driver uart;
113 struct uart_port port[SCCNXP_MAX_UARTS];
114 bool opened[SCCNXP_MAX_UARTS];
115
116 int irq;
117 u8 imr;
118
119 struct sccnxp_chip *chip;
120
121#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
122 struct console console;
123#endif
124
125 spinlock_t lock;
126
127 bool poll;
128 struct timer_list timer;
129
130 struct sccnxp_pdata pdata;
131
132 struct regulator *regulator;
133};
134
135static const struct sccnxp_chip sc2681 = {
136 .name = "SC2681",
137 .nr = 2,
138 .freq_min = 1000000,
139 .freq_std = 3686400,
140 .freq_max = 4000000,
141 .flags = SCCNXP_HAVE_IO,
142 .fifosize = 3,
143 .trwd = 200,
144};
145
146static const struct sccnxp_chip sc2691 = {
147 .name = "SC2691",
148 .nr = 1,
149 .freq_min = 1000000,
150 .freq_std = 3686400,
151 .freq_max = 4000000,
152 .flags = 0,
153 .fifosize = 3,
154 .trwd = 150,
155};
156
157static const struct sccnxp_chip sc2692 = {
158 .name = "SC2692",
159 .nr = 2,
160 .freq_min = 1000000,
161 .freq_std = 3686400,
162 .freq_max = 4000000,
163 .flags = SCCNXP_HAVE_IO,
164 .fifosize = 3,
165 .trwd = 30,
166};
167
168static const struct sccnxp_chip sc2891 = {
169 .name = "SC2891",
170 .nr = 1,
171 .freq_min = 100000,
172 .freq_std = 3686400,
173 .freq_max = 8000000,
174 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
175 .fifosize = 16,
176 .trwd = 27,
177};
178
179static const struct sccnxp_chip sc2892 = {
180 .name = "SC2892",
181 .nr = 2,
182 .freq_min = 100000,
183 .freq_std = 3686400,
184 .freq_max = 8000000,
185 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
186 .fifosize = 16,
187 .trwd = 17,
188};
189
190static const struct sccnxp_chip sc28202 = {
191 .name = "SC28202",
192 .nr = 2,
193 .freq_min = 1000000,
194 .freq_std = 14745600,
195 .freq_max = 50000000,
196 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
197 .fifosize = 256,
198 .trwd = 10,
199};
200
201static const struct sccnxp_chip sc68681 = {
202 .name = "SC68681",
203 .nr = 2,
204 .freq_min = 1000000,
205 .freq_std = 3686400,
206 .freq_max = 4000000,
207 .flags = SCCNXP_HAVE_IO,
208 .fifosize = 3,
209 .trwd = 200,
210};
211
212static const struct sccnxp_chip sc68692 = {
213 .name = "SC68692",
214 .nr = 2,
215 .freq_min = 1000000,
216 .freq_std = 3686400,
217 .freq_max = 4000000,
218 .flags = SCCNXP_HAVE_IO,
219 .fifosize = 3,
220 .trwd = 200,
221};
222
223static u8 sccnxp_read(struct uart_port *port, u8 reg)
224{
225 struct sccnxp_port *s = dev_get_drvdata(port->dev);
226 u8 ret;
227
228 ret = readb(port->membase + (reg << port->regshift));
229
230 ndelay(s->chip->trwd);
231
232 return ret;
233}
234
235static void sccnxp_write(struct uart_port *port, u8 reg, u8 v)
236{
237 struct sccnxp_port *s = dev_get_drvdata(port->dev);
238
239 writeb(v, port->membase + (reg << port->regshift));
240
241 ndelay(s->chip->trwd);
242}
243
244static u8 sccnxp_port_read(struct uart_port *port, u8 reg)
245{
246 return sccnxp_read(port, (port->line << 3) + reg);
247}
248
249static void sccnxp_port_write(struct uart_port *port, u8 reg, u8 v)
250{
251 sccnxp_write(port, (port->line << 3) + reg, v);
252}
253
254static int sccnxp_update_best_err(int a, int b, int *besterr)
255{
256 int err = abs(a - b);
257
258 if (*besterr > err) {
259 *besterr = err;
260 return 0;
261 }
262
263 return 1;
264}
265
266static const struct {
267 u8 csr;
268 u8 acr;
269 u8 mr0;
270 int baud;
271} baud_std[] = {
272 { 0, ACR_BAUD0, MR0_BAUD_NORMAL, 50, },
273 { 0, ACR_BAUD1, MR0_BAUD_NORMAL, 75, },
274 { 1, ACR_BAUD0, MR0_BAUD_NORMAL, 110, },
275 { 2, ACR_BAUD0, MR0_BAUD_NORMAL, 134, },
276 { 3, ACR_BAUD1, MR0_BAUD_NORMAL, 150, },
277 { 3, ACR_BAUD0, MR0_BAUD_NORMAL, 200, },
278 { 4, ACR_BAUD0, MR0_BAUD_NORMAL, 300, },
279 { 0, ACR_BAUD1, MR0_BAUD_EXT1, 450, },
280 { 1, ACR_BAUD0, MR0_BAUD_EXT2, 880, },
281 { 3, ACR_BAUD1, MR0_BAUD_EXT1, 900, },
282 { 5, ACR_BAUD0, MR0_BAUD_NORMAL, 600, },
283 { 7, ACR_BAUD0, MR0_BAUD_NORMAL, 1050, },
284 { 2, ACR_BAUD0, MR0_BAUD_EXT2, 1076, },
285 { 6, ACR_BAUD0, MR0_BAUD_NORMAL, 1200, },
286 { 10, ACR_BAUD1, MR0_BAUD_NORMAL, 1800, },
287 { 7, ACR_BAUD1, MR0_BAUD_NORMAL, 2000, },
288 { 8, ACR_BAUD0, MR0_BAUD_NORMAL, 2400, },
289 { 5, ACR_BAUD1, MR0_BAUD_EXT1, 3600, },
290 { 9, ACR_BAUD0, MR0_BAUD_NORMAL, 4800, },
291 { 10, ACR_BAUD0, MR0_BAUD_NORMAL, 7200, },
292 { 11, ACR_BAUD0, MR0_BAUD_NORMAL, 9600, },
293 { 8, ACR_BAUD0, MR0_BAUD_EXT1, 14400, },
294 { 12, ACR_BAUD1, MR0_BAUD_NORMAL, 19200, },
295 { 9, ACR_BAUD0, MR0_BAUD_EXT1, 28800, },
296 { 12, ACR_BAUD0, MR0_BAUD_NORMAL, 38400, },
297 { 11, ACR_BAUD0, MR0_BAUD_EXT1, 57600, },
298 { 12, ACR_BAUD1, MR0_BAUD_EXT1, 115200, },
299 { 12, ACR_BAUD0, MR0_BAUD_EXT1, 230400, },
300 { 0, 0, 0, 0 }
301};
302
303static int sccnxp_set_baud(struct uart_port *port, int baud)
304{
305 struct sccnxp_port *s = dev_get_drvdata(port->dev);
306 int div_std, tmp_baud, bestbaud = INT_MAX, besterr = INT_MAX;
307 struct sccnxp_chip *chip = s->chip;
308 u8 i, acr = 0, csr = 0, mr0 = 0;
309
310 /* Find divisor to load to the timer preset registers */
311 div_std = DIV_ROUND_CLOSEST(port->uartclk, 2 * 16 * baud);
312 if ((div_std >= 2) && (div_std <= 0xffff)) {
313 bestbaud = DIV_ROUND_CLOSEST(port->uartclk, 2 * 16 * div_std);
314 sccnxp_update_best_err(baud, bestbaud, &besterr);
315 csr = CSR_TIMER_MODE;
316 sccnxp_port_write(port, SCCNXP_CTPU_REG, div_std >> 8);
317 sccnxp_port_write(port, SCCNXP_CTPL_REG, div_std);
318 /* Issue start timer/counter command */
319 sccnxp_port_read(port, SCCNXP_START_COUNTER_REG);
320 }
321
322 /* Find best baud from table */
323 for (i = 0; baud_std[i].baud && besterr; i++) {
324 if (baud_std[i].mr0 && !(chip->flags & SCCNXP_HAVE_MR0))
325 continue;
326 div_std = DIV_ROUND_CLOSEST(chip->freq_std, baud_std[i].baud);
327 tmp_baud = DIV_ROUND_CLOSEST(port->uartclk, div_std);
328 if (!sccnxp_update_best_err(baud, tmp_baud, &besterr)) {
329 acr = baud_std[i].acr;
330 csr = baud_std[i].csr;
331 mr0 = baud_std[i].mr0;
332 bestbaud = tmp_baud;
333 }
334 }
335
336 if (chip->flags & SCCNXP_HAVE_MR0) {
337 /* Enable FIFO, set half level for TX */
338 mr0 |= MR0_FIFO | MR0_TXLVL;
339 /* Update MR0 */
340 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR0);
341 sccnxp_port_write(port, SCCNXP_MR_REG, mr0);
342 }
343
344 sccnxp_port_write(port, SCCNXP_ACR_REG, acr | ACR_TIMER_MODE);
345 sccnxp_port_write(port, SCCNXP_CSR_REG, (csr << 4) | csr);
346
347 if (baud != bestbaud)
348 dev_dbg(port->dev, "Baudrate desired: %i, calculated: %i\n",
349 baud, bestbaud);
350
351 return bestbaud;
352}
353
354static void sccnxp_enable_irq(struct uart_port *port, int mask)
355{
356 struct sccnxp_port *s = dev_get_drvdata(port->dev);
357
358 s->imr |= mask << (port->line * 4);
359 sccnxp_write(port, SCCNXP_IMR_REG, s->imr);
360}
361
362static void sccnxp_disable_irq(struct uart_port *port, int mask)
363{
364 struct sccnxp_port *s = dev_get_drvdata(port->dev);
365
366 s->imr &= ~(mask << (port->line * 4));
367 sccnxp_write(port, SCCNXP_IMR_REG, s->imr);
368}
369
370static void sccnxp_set_bit(struct uart_port *port, int sig, int state)
371{
372 u8 bitmask;
373 struct sccnxp_port *s = dev_get_drvdata(port->dev);
374
375 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(sig)) {
376 bitmask = 1 << MCTRL_OBIT(s->pdata.mctrl_cfg[port->line], sig);
377 if (state)
378 sccnxp_write(port, SCCNXP_SOP_REG, bitmask);
379 else
380 sccnxp_write(port, SCCNXP_ROP_REG, bitmask);
381 }
382}
383
384static void sccnxp_handle_rx(struct uart_port *port)
385{
386 u8 sr, ch, flag;
387
388 for (;;) {
389 sr = sccnxp_port_read(port, SCCNXP_SR_REG);
390 if (!(sr & SR_RXRDY))
391 break;
392 sr &= SR_PE | SR_FE | SR_OVR | SR_BRK;
393
394 ch = sccnxp_port_read(port, SCCNXP_RHR_REG);
395
396 port->icount.rx++;
397 flag = TTY_NORMAL;
398
399 if (unlikely(sr)) {
400 if (sr & SR_BRK) {
401 port->icount.brk++;
402 sccnxp_port_write(port, SCCNXP_CR_REG,
403 CR_CMD_BREAK_RESET);
404 if (uart_handle_break(port))
405 continue;
406 } else if (sr & SR_PE)
407 port->icount.parity++;
408 else if (sr & SR_FE)
409 port->icount.frame++;
410 else if (sr & SR_OVR) {
411 port->icount.overrun++;
412 sccnxp_port_write(port, SCCNXP_CR_REG,
413 CR_CMD_STATUS_RESET);
414 }
415
416 sr &= port->read_status_mask;
417 if (sr & SR_BRK)
418 flag = TTY_BREAK;
419 else if (sr & SR_PE)
420 flag = TTY_PARITY;
421 else if (sr & SR_FE)
422 flag = TTY_FRAME;
423 else if (sr & SR_OVR)
424 flag = TTY_OVERRUN;
425 }
426
427 if (uart_handle_sysrq_char(port, ch))
428 continue;
429
430 if (sr & port->ignore_status_mask)
431 continue;
432
433 uart_insert_char(port, sr, SR_OVR, ch, flag);
434 }
435
436 tty_flip_buffer_push(&port->state->port);
437}
438
439static void sccnxp_handle_tx(struct uart_port *port)
440{
441 u8 sr;
442 struct circ_buf *xmit = &port->state->xmit;
443 struct sccnxp_port *s = dev_get_drvdata(port->dev);
444
445 if (unlikely(port->x_char)) {
446 sccnxp_port_write(port, SCCNXP_THR_REG, port->x_char);
447 port->icount.tx++;
448 port->x_char = 0;
449 return;
450 }
451
452 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
453 /* Disable TX if FIFO is empty */
454 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXEMT) {
455 sccnxp_disable_irq(port, IMR_TXRDY);
456
457 /* Set direction to input */
458 if (s->chip->flags & SCCNXP_HAVE_IO)
459 sccnxp_set_bit(port, DIR_OP, 0);
460 }
461 return;
462 }
463
464 while (!uart_circ_empty(xmit)) {
465 sr = sccnxp_port_read(port, SCCNXP_SR_REG);
466 if (!(sr & SR_TXRDY))
467 break;
468
469 sccnxp_port_write(port, SCCNXP_THR_REG, xmit->buf[xmit->tail]);
470 uart_xmit_advance(port, 1);
471 }
472
473 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
474 uart_write_wakeup(port);
475}
476
477static void sccnxp_handle_events(struct sccnxp_port *s)
478{
479 int i;
480 u8 isr;
481
482 do {
483 isr = sccnxp_read(&s->port[0], SCCNXP_ISR_REG);
484 isr &= s->imr;
485 if (!isr)
486 break;
487
488 for (i = 0; i < s->uart.nr; i++) {
489 if (s->opened[i] && (isr & ISR_RXRDY(i)))
490 sccnxp_handle_rx(&s->port[i]);
491 if (s->opened[i] && (isr & ISR_TXRDY(i)))
492 sccnxp_handle_tx(&s->port[i]);
493 }
494 } while (1);
495}
496
497static void sccnxp_timer(struct timer_list *t)
498{
499 struct sccnxp_port *s = from_timer(s, t, timer);
500 unsigned long flags;
501
502 spin_lock_irqsave(&s->lock, flags);
503 sccnxp_handle_events(s);
504 spin_unlock_irqrestore(&s->lock, flags);
505
506 mod_timer(&s->timer, jiffies + usecs_to_jiffies(s->pdata.poll_time_us));
507}
508
509static irqreturn_t sccnxp_ist(int irq, void *dev_id)
510{
511 struct sccnxp_port *s = (struct sccnxp_port *)dev_id;
512 unsigned long flags;
513
514 spin_lock_irqsave(&s->lock, flags);
515 sccnxp_handle_events(s);
516 spin_unlock_irqrestore(&s->lock, flags);
517
518 return IRQ_HANDLED;
519}
520
521static void sccnxp_start_tx(struct uart_port *port)
522{
523 struct sccnxp_port *s = dev_get_drvdata(port->dev);
524 unsigned long flags;
525
526 spin_lock_irqsave(&s->lock, flags);
527
528 /* Set direction to output */
529 if (s->chip->flags & SCCNXP_HAVE_IO)
530 sccnxp_set_bit(port, DIR_OP, 1);
531
532 sccnxp_enable_irq(port, IMR_TXRDY);
533
534 spin_unlock_irqrestore(&s->lock, flags);
535}
536
537static void sccnxp_stop_tx(struct uart_port *port)
538{
539 /* Do nothing */
540}
541
542static void sccnxp_stop_rx(struct uart_port *port)
543{
544 struct sccnxp_port *s = dev_get_drvdata(port->dev);
545 unsigned long flags;
546
547 spin_lock_irqsave(&s->lock, flags);
548 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE);
549 spin_unlock_irqrestore(&s->lock, flags);
550}
551
552static unsigned int sccnxp_tx_empty(struct uart_port *port)
553{
554 u8 val;
555 unsigned long flags;
556 struct sccnxp_port *s = dev_get_drvdata(port->dev);
557
558 spin_lock_irqsave(&s->lock, flags);
559 val = sccnxp_port_read(port, SCCNXP_SR_REG);
560 spin_unlock_irqrestore(&s->lock, flags);
561
562 return (val & SR_TXEMT) ? TIOCSER_TEMT : 0;
563}
564
565static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl)
566{
567 struct sccnxp_port *s = dev_get_drvdata(port->dev);
568 unsigned long flags;
569
570 if (!(s->chip->flags & SCCNXP_HAVE_IO))
571 return;
572
573 spin_lock_irqsave(&s->lock, flags);
574
575 sccnxp_set_bit(port, DTR_OP, mctrl & TIOCM_DTR);
576 sccnxp_set_bit(port, RTS_OP, mctrl & TIOCM_RTS);
577
578 spin_unlock_irqrestore(&s->lock, flags);
579}
580
581static unsigned int sccnxp_get_mctrl(struct uart_port *port)
582{
583 u8 bitmask, ipr;
584 unsigned long flags;
585 struct sccnxp_port *s = dev_get_drvdata(port->dev);
586 unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
587
588 if (!(s->chip->flags & SCCNXP_HAVE_IO))
589 return mctrl;
590
591 spin_lock_irqsave(&s->lock, flags);
592
593 ipr = ~sccnxp_read(port, SCCNXP_IPCR_REG);
594
595 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DSR_IP)) {
596 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
597 DSR_IP);
598 mctrl &= ~TIOCM_DSR;
599 mctrl |= (ipr & bitmask) ? TIOCM_DSR : 0;
600 }
601 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(CTS_IP)) {
602 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
603 CTS_IP);
604 mctrl &= ~TIOCM_CTS;
605 mctrl |= (ipr & bitmask) ? TIOCM_CTS : 0;
606 }
607 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DCD_IP)) {
608 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
609 DCD_IP);
610 mctrl &= ~TIOCM_CAR;
611 mctrl |= (ipr & bitmask) ? TIOCM_CAR : 0;
612 }
613 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(RNG_IP)) {
614 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
615 RNG_IP);
616 mctrl &= ~TIOCM_RNG;
617 mctrl |= (ipr & bitmask) ? TIOCM_RNG : 0;
618 }
619
620 spin_unlock_irqrestore(&s->lock, flags);
621
622 return mctrl;
623}
624
625static void sccnxp_break_ctl(struct uart_port *port, int break_state)
626{
627 struct sccnxp_port *s = dev_get_drvdata(port->dev);
628 unsigned long flags;
629
630 spin_lock_irqsave(&s->lock, flags);
631 sccnxp_port_write(port, SCCNXP_CR_REG, break_state ?
632 CR_CMD_START_BREAK : CR_CMD_STOP_BREAK);
633 spin_unlock_irqrestore(&s->lock, flags);
634}
635
636static void sccnxp_set_termios(struct uart_port *port,
637 struct ktermios *termios,
638 const struct ktermios *old)
639{
640 struct sccnxp_port *s = dev_get_drvdata(port->dev);
641 unsigned long flags;
642 u8 mr1, mr2;
643 int baud;
644
645 spin_lock_irqsave(&s->lock, flags);
646
647 /* Mask termios capabilities we don't support */
648 termios->c_cflag &= ~CMSPAR;
649
650 /* Disable RX & TX, reset break condition, status and FIFOs */
651 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET |
652 CR_RX_DISABLE | CR_TX_DISABLE);
653 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET);
654 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET);
655 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET);
656
657 /* Word size */
658 switch (termios->c_cflag & CSIZE) {
659 case CS5:
660 mr1 = MR1_BITS_5;
661 break;
662 case CS6:
663 mr1 = MR1_BITS_6;
664 break;
665 case CS7:
666 mr1 = MR1_BITS_7;
667 break;
668 case CS8:
669 default:
670 mr1 = MR1_BITS_8;
671 break;
672 }
673
674 /* Parity */
675 if (termios->c_cflag & PARENB) {
676 if (termios->c_cflag & PARODD)
677 mr1 |= MR1_PAR_ODD;
678 } else
679 mr1 |= MR1_PAR_NO;
680
681 /* Stop bits */
682 mr2 = (termios->c_cflag & CSTOPB) ? MR2_STOP2 : MR2_STOP1;
683
684 /* Update desired format */
685 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR1);
686 sccnxp_port_write(port, SCCNXP_MR_REG, mr1);
687 sccnxp_port_write(port, SCCNXP_MR_REG, mr2);
688
689 /* Set read status mask */
690 port->read_status_mask = SR_OVR;
691 if (termios->c_iflag & INPCK)
692 port->read_status_mask |= SR_PE | SR_FE;
693 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
694 port->read_status_mask |= SR_BRK;
695
696 /* Set status ignore mask */
697 port->ignore_status_mask = 0;
698 if (termios->c_iflag & IGNBRK)
699 port->ignore_status_mask |= SR_BRK;
700 if (termios->c_iflag & IGNPAR)
701 port->ignore_status_mask |= SR_PE;
702 if (!(termios->c_cflag & CREAD))
703 port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK;
704
705 /* Setup baudrate */
706 baud = uart_get_baud_rate(port, termios, old, 50,
707 (s->chip->flags & SCCNXP_HAVE_MR0) ?
708 230400 : 38400);
709 baud = sccnxp_set_baud(port, baud);
710
711 /* Update timeout according to new baud rate */
712 uart_update_timeout(port, termios->c_cflag, baud);
713
714 /* Report actual baudrate back to core */
715 if (tty_termios_baud_rate(termios))
716 tty_termios_encode_baud_rate(termios, baud, baud);
717
718 /* Enable RX & TX */
719 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE);
720
721 spin_unlock_irqrestore(&s->lock, flags);
722}
723
724static int sccnxp_startup(struct uart_port *port)
725{
726 struct sccnxp_port *s = dev_get_drvdata(port->dev);
727 unsigned long flags;
728
729 spin_lock_irqsave(&s->lock, flags);
730
731 if (s->chip->flags & SCCNXP_HAVE_IO) {
732 /* Outputs are controlled manually */
733 sccnxp_write(port, SCCNXP_OPCR_REG, 0);
734 }
735
736 /* Reset break condition, status and FIFOs */
737 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET);
738 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET);
739 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET);
740 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET);
741
742 /* Enable RX & TX */
743 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE);
744
745 /* Enable RX interrupt */
746 sccnxp_enable_irq(port, IMR_RXRDY);
747
748 s->opened[port->line] = 1;
749
750 spin_unlock_irqrestore(&s->lock, flags);
751
752 return 0;
753}
754
755static void sccnxp_shutdown(struct uart_port *port)
756{
757 struct sccnxp_port *s = dev_get_drvdata(port->dev);
758 unsigned long flags;
759
760 spin_lock_irqsave(&s->lock, flags);
761
762 s->opened[port->line] = 0;
763
764 /* Disable interrupts */
765 sccnxp_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
766
767 /* Disable TX & RX */
768 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE | CR_TX_DISABLE);
769
770 /* Leave direction to input */
771 if (s->chip->flags & SCCNXP_HAVE_IO)
772 sccnxp_set_bit(port, DIR_OP, 0);
773
774 spin_unlock_irqrestore(&s->lock, flags);
775}
776
777static const char *sccnxp_type(struct uart_port *port)
778{
779 struct sccnxp_port *s = dev_get_drvdata(port->dev);
780
781 return (port->type == PORT_SC26XX) ? s->chip->name : NULL;
782}
783
784static void sccnxp_release_port(struct uart_port *port)
785{
786 /* Do nothing */
787}
788
789static int sccnxp_request_port(struct uart_port *port)
790{
791 /* Do nothing */
792 return 0;
793}
794
795static void sccnxp_config_port(struct uart_port *port, int flags)
796{
797 if (flags & UART_CONFIG_TYPE)
798 port->type = PORT_SC26XX;
799}
800
801static int sccnxp_verify_port(struct uart_port *port, struct serial_struct *s)
802{
803 if ((s->type == PORT_UNKNOWN) || (s->type == PORT_SC26XX))
804 return 0;
805 if (s->irq == port->irq)
806 return 0;
807
808 return -EINVAL;
809}
810
811static const struct uart_ops sccnxp_ops = {
812 .tx_empty = sccnxp_tx_empty,
813 .set_mctrl = sccnxp_set_mctrl,
814 .get_mctrl = sccnxp_get_mctrl,
815 .stop_tx = sccnxp_stop_tx,
816 .start_tx = sccnxp_start_tx,
817 .stop_rx = sccnxp_stop_rx,
818 .break_ctl = sccnxp_break_ctl,
819 .startup = sccnxp_startup,
820 .shutdown = sccnxp_shutdown,
821 .set_termios = sccnxp_set_termios,
822 .type = sccnxp_type,
823 .release_port = sccnxp_release_port,
824 .request_port = sccnxp_request_port,
825 .config_port = sccnxp_config_port,
826 .verify_port = sccnxp_verify_port,
827};
828
829#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
830static void sccnxp_console_putchar(struct uart_port *port, unsigned char c)
831{
832 int tryes = 100000;
833
834 while (tryes--) {
835 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXRDY) {
836 sccnxp_port_write(port, SCCNXP_THR_REG, c);
837 break;
838 }
839 barrier();
840 }
841}
842
843static void sccnxp_console_write(struct console *co, const char *c, unsigned n)
844{
845 struct sccnxp_port *s = (struct sccnxp_port *)co->data;
846 struct uart_port *port = &s->port[co->index];
847 unsigned long flags;
848
849 spin_lock_irqsave(&s->lock, flags);
850 uart_console_write(port, c, n, sccnxp_console_putchar);
851 spin_unlock_irqrestore(&s->lock, flags);
852}
853
854static int sccnxp_console_setup(struct console *co, char *options)
855{
856 struct sccnxp_port *s = (struct sccnxp_port *)co->data;
857 struct uart_port *port = &s->port[(co->index > 0) ? co->index : 0];
858 int baud = 9600, bits = 8, parity = 'n', flow = 'n';
859
860 if (options)
861 uart_parse_options(options, &baud, &parity, &bits, &flow);
862
863 return uart_set_options(port, co, baud, parity, bits, flow);
864}
865#endif
866
867static const struct platform_device_id sccnxp_id_table[] = {
868 { .name = "sc2681", .driver_data = (kernel_ulong_t)&sc2681, },
869 { .name = "sc2691", .driver_data = (kernel_ulong_t)&sc2691, },
870 { .name = "sc2692", .driver_data = (kernel_ulong_t)&sc2692, },
871 { .name = "sc2891", .driver_data = (kernel_ulong_t)&sc2891, },
872 { .name = "sc2892", .driver_data = (kernel_ulong_t)&sc2892, },
873 { .name = "sc28202", .driver_data = (kernel_ulong_t)&sc28202, },
874 { .name = "sc68681", .driver_data = (kernel_ulong_t)&sc68681, },
875 { .name = "sc68692", .driver_data = (kernel_ulong_t)&sc68692, },
876 { }
877};
878MODULE_DEVICE_TABLE(platform, sccnxp_id_table);
879
880static int sccnxp_probe(struct platform_device *pdev)
881{
882 struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev);
883 struct resource *res;
884 int i, ret, uartclk;
885 struct sccnxp_port *s;
886 void __iomem *membase;
887 struct clk *clk;
888
889 membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
890 if (IS_ERR(membase))
891 return PTR_ERR(membase);
892
893 s = devm_kzalloc(&pdev->dev, sizeof(struct sccnxp_port), GFP_KERNEL);
894 if (!s) {
895 dev_err(&pdev->dev, "Error allocating port structure\n");
896 return -ENOMEM;
897 }
898 platform_set_drvdata(pdev, s);
899
900 spin_lock_init(&s->lock);
901
902 s->chip = (struct sccnxp_chip *)pdev->id_entry->driver_data;
903
904 s->regulator = devm_regulator_get(&pdev->dev, "vcc");
905 if (!IS_ERR(s->regulator)) {
906 ret = regulator_enable(s->regulator);
907 if (ret) {
908 dev_err(&pdev->dev,
909 "Failed to enable regulator: %i\n", ret);
910 return ret;
911 }
912 } else if (PTR_ERR(s->regulator) == -EPROBE_DEFER)
913 return -EPROBE_DEFER;
914
915 clk = devm_clk_get_enabled(&pdev->dev, NULL);
916 if (IS_ERR(clk)) {
917 ret = PTR_ERR(clk);
918 if (ret == -EPROBE_DEFER)
919 goto err_out;
920 uartclk = 0;
921 } else {
922 uartclk = clk_get_rate(clk);
923 }
924
925 if (!uartclk) {
926 dev_notice(&pdev->dev, "Using default clock frequency\n");
927 uartclk = s->chip->freq_std;
928 }
929
930 /* Check input frequency */
931 if ((uartclk < s->chip->freq_min) || (uartclk > s->chip->freq_max)) {
932 dev_err(&pdev->dev, "Frequency out of bounds\n");
933 ret = -EINVAL;
934 goto err_out;
935 }
936
937 if (pdata)
938 memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));
939
940 if (s->pdata.poll_time_us) {
941 dev_info(&pdev->dev, "Using poll mode, resolution %u usecs\n",
942 s->pdata.poll_time_us);
943 s->poll = 1;
944 }
945
946 if (!s->poll) {
947 s->irq = platform_get_irq(pdev, 0);
948 if (s->irq < 0) {
949 ret = -ENXIO;
950 goto err_out;
951 }
952 }
953
954 s->uart.owner = THIS_MODULE;
955 s->uart.dev_name = "ttySC";
956 s->uart.major = SCCNXP_MAJOR;
957 s->uart.minor = SCCNXP_MINOR;
958 s->uart.nr = s->chip->nr;
959#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
960 s->uart.cons = &s->console;
961 s->uart.cons->device = uart_console_device;
962 s->uart.cons->write = sccnxp_console_write;
963 s->uart.cons->setup = sccnxp_console_setup;
964 s->uart.cons->flags = CON_PRINTBUFFER;
965 s->uart.cons->index = -1;
966 s->uart.cons->data = s;
967 strcpy(s->uart.cons->name, "ttySC");
968#endif
969 ret = uart_register_driver(&s->uart);
970 if (ret) {
971 dev_err(&pdev->dev, "Registering UART driver failed\n");
972 goto err_out;
973 }
974
975 for (i = 0; i < s->uart.nr; i++) {
976 s->port[i].line = i;
977 s->port[i].dev = &pdev->dev;
978 s->port[i].irq = s->irq;
979 s->port[i].type = PORT_SC26XX;
980 s->port[i].fifosize = s->chip->fifosize;
981 s->port[i].flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
982 s->port[i].iotype = UPIO_MEM;
983 s->port[i].mapbase = res->start;
984 s->port[i].membase = membase;
985 s->port[i].regshift = s->pdata.reg_shift;
986 s->port[i].uartclk = uartclk;
987 s->port[i].ops = &sccnxp_ops;
988 s->port[i].has_sysrq = IS_ENABLED(CONFIG_SERIAL_SCCNXP_CONSOLE);
989 uart_add_one_port(&s->uart, &s->port[i]);
990 /* Set direction to input */
991 if (s->chip->flags & SCCNXP_HAVE_IO)
992 sccnxp_set_bit(&s->port[i], DIR_OP, 0);
993 }
994
995 /* Disable interrupts */
996 s->imr = 0;
997 sccnxp_write(&s->port[0], SCCNXP_IMR_REG, 0);
998
999 if (!s->poll) {
1000 ret = devm_request_threaded_irq(&pdev->dev, s->irq, NULL,
1001 sccnxp_ist,
1002 IRQF_TRIGGER_FALLING |
1003 IRQF_ONESHOT,
1004 dev_name(&pdev->dev), s);
1005 if (!ret)
1006 return 0;
1007
1008 dev_err(&pdev->dev, "Unable to reguest IRQ %i\n", s->irq);
1009 } else {
1010 timer_setup(&s->timer, sccnxp_timer, 0);
1011 mod_timer(&s->timer, jiffies +
1012 usecs_to_jiffies(s->pdata.poll_time_us));
1013 return 0;
1014 }
1015
1016 uart_unregister_driver(&s->uart);
1017err_out:
1018 if (!IS_ERR(s->regulator))
1019 regulator_disable(s->regulator);
1020
1021 return ret;
1022}
1023
1024static void sccnxp_remove(struct platform_device *pdev)
1025{
1026 int i;
1027 struct sccnxp_port *s = platform_get_drvdata(pdev);
1028
1029 if (!s->poll)
1030 devm_free_irq(&pdev->dev, s->irq, s);
1031 else
1032 del_timer_sync(&s->timer);
1033
1034 for (i = 0; i < s->uart.nr; i++)
1035 uart_remove_one_port(&s->uart, &s->port[i]);
1036
1037 uart_unregister_driver(&s->uart);
1038
1039 if (!IS_ERR(s->regulator)) {
1040 int ret = regulator_disable(s->regulator);
1041 if (ret)
1042 dev_err(&pdev->dev, "Failed to disable regulator\n");
1043 }
1044}
1045
1046static struct platform_driver sccnxp_uart_driver = {
1047 .driver = {
1048 .name = SCCNXP_NAME,
1049 },
1050 .probe = sccnxp_probe,
1051 .remove_new = sccnxp_remove,
1052 .id_table = sccnxp_id_table,
1053};
1054module_platform_driver(sccnxp_uart_driver);
1055
1056MODULE_LICENSE("GPL v2");
1057MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
1058MODULE_DESCRIPTION("SCCNXP serial driver");
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#include <linux/clk.h>
11#include <linux/delay.h>
12#include <linux/err.h>
13#include <linux/module.h>
14#include <linux/mod_devicetable.h>
15#include <linux/device.h>
16#include <linux/console.h>
17#include <linux/serial_core.h>
18#include <linux/serial.h>
19#include <linux/io.h>
20#include <linux/tty.h>
21#include <linux/tty_flip.h>
22#include <linux/spinlock.h>
23#include <linux/platform_device.h>
24#include <linux/platform_data/serial-sccnxp.h>
25#include <linux/regulator/consumer.h>
26
27#define SCCNXP_NAME "uart-sccnxp"
28#define SCCNXP_MAJOR 204
29#define SCCNXP_MINOR 205
30
31#define SCCNXP_MR_REG (0x00)
32# define MR0_BAUD_NORMAL (0 << 0)
33# define MR0_BAUD_EXT1 (1 << 0)
34# define MR0_BAUD_EXT2 (5 << 0)
35# define MR0_FIFO (1 << 3)
36# define MR0_TXLVL (1 << 4)
37# define MR1_BITS_5 (0 << 0)
38# define MR1_BITS_6 (1 << 0)
39# define MR1_BITS_7 (2 << 0)
40# define MR1_BITS_8 (3 << 0)
41# define MR1_PAR_EVN (0 << 2)
42# define MR1_PAR_ODD (1 << 2)
43# define MR1_PAR_NO (4 << 2)
44# define MR2_STOP1 (7 << 0)
45# define MR2_STOP2 (0xf << 0)
46#define SCCNXP_SR_REG (0x01)
47# define SR_RXRDY (1 << 0)
48# define SR_FULL (1 << 1)
49# define SR_TXRDY (1 << 2)
50# define SR_TXEMT (1 << 3)
51# define SR_OVR (1 << 4)
52# define SR_PE (1 << 5)
53# define SR_FE (1 << 6)
54# define SR_BRK (1 << 7)
55#define SCCNXP_CSR_REG (SCCNXP_SR_REG)
56# define CSR_TIMER_MODE (0x0d)
57#define SCCNXP_CR_REG (0x02)
58# define CR_RX_ENABLE (1 << 0)
59# define CR_RX_DISABLE (1 << 1)
60# define CR_TX_ENABLE (1 << 2)
61# define CR_TX_DISABLE (1 << 3)
62# define CR_CMD_MRPTR1 (0x01 << 4)
63# define CR_CMD_RX_RESET (0x02 << 4)
64# define CR_CMD_TX_RESET (0x03 << 4)
65# define CR_CMD_STATUS_RESET (0x04 << 4)
66# define CR_CMD_BREAK_RESET (0x05 << 4)
67# define CR_CMD_START_BREAK (0x06 << 4)
68# define CR_CMD_STOP_BREAK (0x07 << 4)
69# define CR_CMD_MRPTR0 (0x0b << 4)
70#define SCCNXP_RHR_REG (0x03)
71#define SCCNXP_THR_REG SCCNXP_RHR_REG
72#define SCCNXP_IPCR_REG (0x04)
73#define SCCNXP_ACR_REG SCCNXP_IPCR_REG
74# define ACR_BAUD0 (0 << 7)
75# define ACR_BAUD1 (1 << 7)
76# define ACR_TIMER_MODE (6 << 4)
77#define SCCNXP_ISR_REG (0x05)
78#define SCCNXP_IMR_REG SCCNXP_ISR_REG
79# define IMR_TXRDY (1 << 0)
80# define IMR_RXRDY (1 << 1)
81# define ISR_TXRDY(x) (1 << ((x * 4) + 0))
82# define ISR_RXRDY(x) (1 << ((x * 4) + 1))
83#define SCCNXP_CTPU_REG (0x06)
84#define SCCNXP_CTPL_REG (0x07)
85#define SCCNXP_IPR_REG (0x0d)
86#define SCCNXP_OPCR_REG SCCNXP_IPR_REG
87#define SCCNXP_SOP_REG (0x0e)
88#define SCCNXP_START_COUNTER_REG SCCNXP_SOP_REG
89#define SCCNXP_ROP_REG (0x0f)
90
91/* Route helpers */
92#define MCTRL_MASK(sig) (0xf << (sig))
93#define MCTRL_IBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_IP0)
94#define MCTRL_OBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_OP0)
95
96#define SCCNXP_HAVE_IO 0x00000001
97#define SCCNXP_HAVE_MR0 0x00000002
98
99struct sccnxp_chip {
100 const char *name;
101 unsigned int nr;
102 unsigned long freq_min;
103 unsigned long freq_std;
104 unsigned long freq_max;
105 unsigned int flags;
106 unsigned int fifosize;
107 /* Time between read/write cycles */
108 unsigned int trwd;
109};
110
111struct sccnxp_port {
112 struct uart_driver uart;
113 struct uart_port port[SCCNXP_MAX_UARTS];
114 bool opened[SCCNXP_MAX_UARTS];
115
116 int irq;
117 u8 imr;
118
119 struct sccnxp_chip *chip;
120
121#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
122 struct console console;
123#endif
124
125 spinlock_t lock;
126
127 bool poll;
128 struct timer_list timer;
129
130 struct sccnxp_pdata pdata;
131
132 struct regulator *regulator;
133};
134
135static const struct sccnxp_chip sc2681 = {
136 .name = "SC2681",
137 .nr = 2,
138 .freq_min = 1000000,
139 .freq_std = 3686400,
140 .freq_max = 4000000,
141 .flags = SCCNXP_HAVE_IO,
142 .fifosize = 3,
143 .trwd = 200,
144};
145
146static const struct sccnxp_chip sc2691 = {
147 .name = "SC2691",
148 .nr = 1,
149 .freq_min = 1000000,
150 .freq_std = 3686400,
151 .freq_max = 4000000,
152 .flags = 0,
153 .fifosize = 3,
154 .trwd = 150,
155};
156
157static const struct sccnxp_chip sc2692 = {
158 .name = "SC2692",
159 .nr = 2,
160 .freq_min = 1000000,
161 .freq_std = 3686400,
162 .freq_max = 4000000,
163 .flags = SCCNXP_HAVE_IO,
164 .fifosize = 3,
165 .trwd = 30,
166};
167
168static const struct sccnxp_chip sc2891 = {
169 .name = "SC2891",
170 .nr = 1,
171 .freq_min = 100000,
172 .freq_std = 3686400,
173 .freq_max = 8000000,
174 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
175 .fifosize = 16,
176 .trwd = 27,
177};
178
179static const struct sccnxp_chip sc2892 = {
180 .name = "SC2892",
181 .nr = 2,
182 .freq_min = 100000,
183 .freq_std = 3686400,
184 .freq_max = 8000000,
185 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
186 .fifosize = 16,
187 .trwd = 17,
188};
189
190static const struct sccnxp_chip sc28202 = {
191 .name = "SC28202",
192 .nr = 2,
193 .freq_min = 1000000,
194 .freq_std = 14745600,
195 .freq_max = 50000000,
196 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
197 .fifosize = 256,
198 .trwd = 10,
199};
200
201static const struct sccnxp_chip sc68681 = {
202 .name = "SC68681",
203 .nr = 2,
204 .freq_min = 1000000,
205 .freq_std = 3686400,
206 .freq_max = 4000000,
207 .flags = SCCNXP_HAVE_IO,
208 .fifosize = 3,
209 .trwd = 200,
210};
211
212static const struct sccnxp_chip sc68692 = {
213 .name = "SC68692",
214 .nr = 2,
215 .freq_min = 1000000,
216 .freq_std = 3686400,
217 .freq_max = 4000000,
218 .flags = SCCNXP_HAVE_IO,
219 .fifosize = 3,
220 .trwd = 200,
221};
222
223static u8 sccnxp_read(struct uart_port *port, u8 reg)
224{
225 struct sccnxp_port *s = dev_get_drvdata(port->dev);
226 u8 ret;
227
228 ret = readb(port->membase + (reg << port->regshift));
229
230 ndelay(s->chip->trwd);
231
232 return ret;
233}
234
235static void sccnxp_write(struct uart_port *port, u8 reg, u8 v)
236{
237 struct sccnxp_port *s = dev_get_drvdata(port->dev);
238
239 writeb(v, port->membase + (reg << port->regshift));
240
241 ndelay(s->chip->trwd);
242}
243
244static u8 sccnxp_port_read(struct uart_port *port, u8 reg)
245{
246 return sccnxp_read(port, (port->line << 3) + reg);
247}
248
249static void sccnxp_port_write(struct uart_port *port, u8 reg, u8 v)
250{
251 sccnxp_write(port, (port->line << 3) + reg, v);
252}
253
254static int sccnxp_update_best_err(int a, int b, int *besterr)
255{
256 int err = abs(a - b);
257
258 if (*besterr > err) {
259 *besterr = err;
260 return 0;
261 }
262
263 return 1;
264}
265
266static const struct {
267 u8 csr;
268 u8 acr;
269 u8 mr0;
270 int baud;
271} baud_std[] = {
272 { 0, ACR_BAUD0, MR0_BAUD_NORMAL, 50, },
273 { 0, ACR_BAUD1, MR0_BAUD_NORMAL, 75, },
274 { 1, ACR_BAUD0, MR0_BAUD_NORMAL, 110, },
275 { 2, ACR_BAUD0, MR0_BAUD_NORMAL, 134, },
276 { 3, ACR_BAUD1, MR0_BAUD_NORMAL, 150, },
277 { 3, ACR_BAUD0, MR0_BAUD_NORMAL, 200, },
278 { 4, ACR_BAUD0, MR0_BAUD_NORMAL, 300, },
279 { 0, ACR_BAUD1, MR0_BAUD_EXT1, 450, },
280 { 1, ACR_BAUD0, MR0_BAUD_EXT2, 880, },
281 { 3, ACR_BAUD1, MR0_BAUD_EXT1, 900, },
282 { 5, ACR_BAUD0, MR0_BAUD_NORMAL, 600, },
283 { 7, ACR_BAUD0, MR0_BAUD_NORMAL, 1050, },
284 { 2, ACR_BAUD0, MR0_BAUD_EXT2, 1076, },
285 { 6, ACR_BAUD0, MR0_BAUD_NORMAL, 1200, },
286 { 10, ACR_BAUD1, MR0_BAUD_NORMAL, 1800, },
287 { 7, ACR_BAUD1, MR0_BAUD_NORMAL, 2000, },
288 { 8, ACR_BAUD0, MR0_BAUD_NORMAL, 2400, },
289 { 5, ACR_BAUD1, MR0_BAUD_EXT1, 3600, },
290 { 9, ACR_BAUD0, MR0_BAUD_NORMAL, 4800, },
291 { 10, ACR_BAUD0, MR0_BAUD_NORMAL, 7200, },
292 { 11, ACR_BAUD0, MR0_BAUD_NORMAL, 9600, },
293 { 8, ACR_BAUD0, MR0_BAUD_EXT1, 14400, },
294 { 12, ACR_BAUD1, MR0_BAUD_NORMAL, 19200, },
295 { 9, ACR_BAUD0, MR0_BAUD_EXT1, 28800, },
296 { 12, ACR_BAUD0, MR0_BAUD_NORMAL, 38400, },
297 { 11, ACR_BAUD0, MR0_BAUD_EXT1, 57600, },
298 { 12, ACR_BAUD1, MR0_BAUD_EXT1, 115200, },
299 { 12, ACR_BAUD0, MR0_BAUD_EXT1, 230400, },
300 { 0, 0, 0, 0 }
301};
302
303static int sccnxp_set_baud(struct uart_port *port, int baud)
304{
305 struct sccnxp_port *s = dev_get_drvdata(port->dev);
306 int div_std, tmp_baud, bestbaud = INT_MAX, besterr = INT_MAX;
307 struct sccnxp_chip *chip = s->chip;
308 u8 i, acr = 0, csr = 0, mr0 = 0;
309
310 /* Find divisor to load to the timer preset registers */
311 div_std = DIV_ROUND_CLOSEST(port->uartclk, 2 * 16 * baud);
312 if ((div_std >= 2) && (div_std <= 0xffff)) {
313 bestbaud = DIV_ROUND_CLOSEST(port->uartclk, 2 * 16 * div_std);
314 sccnxp_update_best_err(baud, bestbaud, &besterr);
315 csr = CSR_TIMER_MODE;
316 sccnxp_port_write(port, SCCNXP_CTPU_REG, div_std >> 8);
317 sccnxp_port_write(port, SCCNXP_CTPL_REG, div_std);
318 /* Issue start timer/counter command */
319 sccnxp_port_read(port, SCCNXP_START_COUNTER_REG);
320 }
321
322 /* Find best baud from table */
323 for (i = 0; baud_std[i].baud && besterr; i++) {
324 if (baud_std[i].mr0 && !(chip->flags & SCCNXP_HAVE_MR0))
325 continue;
326 div_std = DIV_ROUND_CLOSEST(chip->freq_std, baud_std[i].baud);
327 tmp_baud = DIV_ROUND_CLOSEST(port->uartclk, div_std);
328 if (!sccnxp_update_best_err(baud, tmp_baud, &besterr)) {
329 acr = baud_std[i].acr;
330 csr = baud_std[i].csr;
331 mr0 = baud_std[i].mr0;
332 bestbaud = tmp_baud;
333 }
334 }
335
336 if (chip->flags & SCCNXP_HAVE_MR0) {
337 /* Enable FIFO, set half level for TX */
338 mr0 |= MR0_FIFO | MR0_TXLVL;
339 /* Update MR0 */
340 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR0);
341 sccnxp_port_write(port, SCCNXP_MR_REG, mr0);
342 }
343
344 sccnxp_port_write(port, SCCNXP_ACR_REG, acr | ACR_TIMER_MODE);
345 sccnxp_port_write(port, SCCNXP_CSR_REG, (csr << 4) | csr);
346
347 if (baud != bestbaud)
348 dev_dbg(port->dev, "Baudrate desired: %i, calculated: %i\n",
349 baud, bestbaud);
350
351 return bestbaud;
352}
353
354static void sccnxp_enable_irq(struct uart_port *port, int mask)
355{
356 struct sccnxp_port *s = dev_get_drvdata(port->dev);
357
358 s->imr |= mask << (port->line * 4);
359 sccnxp_write(port, SCCNXP_IMR_REG, s->imr);
360}
361
362static void sccnxp_disable_irq(struct uart_port *port, int mask)
363{
364 struct sccnxp_port *s = dev_get_drvdata(port->dev);
365
366 s->imr &= ~(mask << (port->line * 4));
367 sccnxp_write(port, SCCNXP_IMR_REG, s->imr);
368}
369
370static void sccnxp_set_bit(struct uart_port *port, int sig, int state)
371{
372 u8 bitmask;
373 struct sccnxp_port *s = dev_get_drvdata(port->dev);
374
375 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(sig)) {
376 bitmask = 1 << MCTRL_OBIT(s->pdata.mctrl_cfg[port->line], sig);
377 if (state)
378 sccnxp_write(port, SCCNXP_SOP_REG, bitmask);
379 else
380 sccnxp_write(port, SCCNXP_ROP_REG, bitmask);
381 }
382}
383
384static void sccnxp_handle_rx(struct uart_port *port)
385{
386 u8 sr, ch, flag;
387
388 for (;;) {
389 sr = sccnxp_port_read(port, SCCNXP_SR_REG);
390 if (!(sr & SR_RXRDY))
391 break;
392 sr &= SR_PE | SR_FE | SR_OVR | SR_BRK;
393
394 ch = sccnxp_port_read(port, SCCNXP_RHR_REG);
395
396 port->icount.rx++;
397 flag = TTY_NORMAL;
398
399 if (unlikely(sr)) {
400 if (sr & SR_BRK) {
401 port->icount.brk++;
402 sccnxp_port_write(port, SCCNXP_CR_REG,
403 CR_CMD_BREAK_RESET);
404 if (uart_handle_break(port))
405 continue;
406 } else if (sr & SR_PE)
407 port->icount.parity++;
408 else if (sr & SR_FE)
409 port->icount.frame++;
410 else if (sr & SR_OVR) {
411 port->icount.overrun++;
412 sccnxp_port_write(port, SCCNXP_CR_REG,
413 CR_CMD_STATUS_RESET);
414 }
415
416 sr &= port->read_status_mask;
417 if (sr & SR_BRK)
418 flag = TTY_BREAK;
419 else if (sr & SR_PE)
420 flag = TTY_PARITY;
421 else if (sr & SR_FE)
422 flag = TTY_FRAME;
423 else if (sr & SR_OVR)
424 flag = TTY_OVERRUN;
425 }
426
427 if (uart_handle_sysrq_char(port, ch))
428 continue;
429
430 if (sr & port->ignore_status_mask)
431 continue;
432
433 uart_insert_char(port, sr, SR_OVR, ch, flag);
434 }
435
436 tty_flip_buffer_push(&port->state->port);
437}
438
439static void sccnxp_handle_tx(struct uart_port *port)
440{
441 u8 sr;
442 struct tty_port *tport = &port->state->port;
443 struct sccnxp_port *s = dev_get_drvdata(port->dev);
444
445 if (unlikely(port->x_char)) {
446 sccnxp_port_write(port, SCCNXP_THR_REG, port->x_char);
447 port->icount.tx++;
448 port->x_char = 0;
449 return;
450 }
451
452 if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
453 /* Disable TX if FIFO is empty */
454 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXEMT) {
455 sccnxp_disable_irq(port, IMR_TXRDY);
456
457 /* Set direction to input */
458 if (s->chip->flags & SCCNXP_HAVE_IO)
459 sccnxp_set_bit(port, DIR_OP, 0);
460 }
461 return;
462 }
463
464 while (1) {
465 unsigned char ch;
466
467 sr = sccnxp_port_read(port, SCCNXP_SR_REG);
468 if (!(sr & SR_TXRDY))
469 break;
470
471 if (!uart_fifo_get(port, &ch))
472 break;
473
474 sccnxp_port_write(port, SCCNXP_THR_REG, ch);
475 }
476
477 if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
478 uart_write_wakeup(port);
479}
480
481static void sccnxp_handle_events(struct sccnxp_port *s)
482{
483 int i;
484 u8 isr;
485
486 do {
487 isr = sccnxp_read(&s->port[0], SCCNXP_ISR_REG);
488 isr &= s->imr;
489 if (!isr)
490 break;
491
492 for (i = 0; i < s->uart.nr; i++) {
493 if (s->opened[i] && (isr & ISR_RXRDY(i)))
494 sccnxp_handle_rx(&s->port[i]);
495 if (s->opened[i] && (isr & ISR_TXRDY(i)))
496 sccnxp_handle_tx(&s->port[i]);
497 }
498 } while (1);
499}
500
501static void sccnxp_timer(struct timer_list *t)
502{
503 struct sccnxp_port *s = from_timer(s, t, timer);
504 unsigned long flags;
505
506 spin_lock_irqsave(&s->lock, flags);
507 sccnxp_handle_events(s);
508 spin_unlock_irqrestore(&s->lock, flags);
509
510 mod_timer(&s->timer, jiffies + usecs_to_jiffies(s->pdata.poll_time_us));
511}
512
513static irqreturn_t sccnxp_ist(int irq, void *dev_id)
514{
515 struct sccnxp_port *s = (struct sccnxp_port *)dev_id;
516 unsigned long flags;
517
518 spin_lock_irqsave(&s->lock, flags);
519 sccnxp_handle_events(s);
520 spin_unlock_irqrestore(&s->lock, flags);
521
522 return IRQ_HANDLED;
523}
524
525static void sccnxp_start_tx(struct uart_port *port)
526{
527 struct sccnxp_port *s = dev_get_drvdata(port->dev);
528 unsigned long flags;
529
530 spin_lock_irqsave(&s->lock, flags);
531
532 /* Set direction to output */
533 if (s->chip->flags & SCCNXP_HAVE_IO)
534 sccnxp_set_bit(port, DIR_OP, 1);
535
536 sccnxp_enable_irq(port, IMR_TXRDY);
537
538 spin_unlock_irqrestore(&s->lock, flags);
539}
540
541static void sccnxp_stop_tx(struct uart_port *port)
542{
543 /* Do nothing */
544}
545
546static void sccnxp_stop_rx(struct uart_port *port)
547{
548 struct sccnxp_port *s = dev_get_drvdata(port->dev);
549 unsigned long flags;
550
551 spin_lock_irqsave(&s->lock, flags);
552 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE);
553 spin_unlock_irqrestore(&s->lock, flags);
554}
555
556static unsigned int sccnxp_tx_empty(struct uart_port *port)
557{
558 u8 val;
559 unsigned long flags;
560 struct sccnxp_port *s = dev_get_drvdata(port->dev);
561
562 spin_lock_irqsave(&s->lock, flags);
563 val = sccnxp_port_read(port, SCCNXP_SR_REG);
564 spin_unlock_irqrestore(&s->lock, flags);
565
566 return (val & SR_TXEMT) ? TIOCSER_TEMT : 0;
567}
568
569static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl)
570{
571 struct sccnxp_port *s = dev_get_drvdata(port->dev);
572 unsigned long flags;
573
574 if (!(s->chip->flags & SCCNXP_HAVE_IO))
575 return;
576
577 spin_lock_irqsave(&s->lock, flags);
578
579 sccnxp_set_bit(port, DTR_OP, mctrl & TIOCM_DTR);
580 sccnxp_set_bit(port, RTS_OP, mctrl & TIOCM_RTS);
581
582 spin_unlock_irqrestore(&s->lock, flags);
583}
584
585static unsigned int sccnxp_get_mctrl(struct uart_port *port)
586{
587 u8 bitmask, ipr;
588 unsigned long flags;
589 struct sccnxp_port *s = dev_get_drvdata(port->dev);
590 unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
591
592 if (!(s->chip->flags & SCCNXP_HAVE_IO))
593 return mctrl;
594
595 spin_lock_irqsave(&s->lock, flags);
596
597 ipr = ~sccnxp_read(port, SCCNXP_IPCR_REG);
598
599 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DSR_IP)) {
600 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
601 DSR_IP);
602 mctrl &= ~TIOCM_DSR;
603 mctrl |= (ipr & bitmask) ? TIOCM_DSR : 0;
604 }
605 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(CTS_IP)) {
606 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
607 CTS_IP);
608 mctrl &= ~TIOCM_CTS;
609 mctrl |= (ipr & bitmask) ? TIOCM_CTS : 0;
610 }
611 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DCD_IP)) {
612 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
613 DCD_IP);
614 mctrl &= ~TIOCM_CAR;
615 mctrl |= (ipr & bitmask) ? TIOCM_CAR : 0;
616 }
617 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(RNG_IP)) {
618 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
619 RNG_IP);
620 mctrl &= ~TIOCM_RNG;
621 mctrl |= (ipr & bitmask) ? TIOCM_RNG : 0;
622 }
623
624 spin_unlock_irqrestore(&s->lock, flags);
625
626 return mctrl;
627}
628
629static void sccnxp_break_ctl(struct uart_port *port, int break_state)
630{
631 struct sccnxp_port *s = dev_get_drvdata(port->dev);
632 unsigned long flags;
633
634 spin_lock_irqsave(&s->lock, flags);
635 sccnxp_port_write(port, SCCNXP_CR_REG, break_state ?
636 CR_CMD_START_BREAK : CR_CMD_STOP_BREAK);
637 spin_unlock_irqrestore(&s->lock, flags);
638}
639
640static void sccnxp_set_termios(struct uart_port *port,
641 struct ktermios *termios,
642 const struct ktermios *old)
643{
644 struct sccnxp_port *s = dev_get_drvdata(port->dev);
645 unsigned long flags;
646 u8 mr1, mr2;
647 int baud;
648
649 spin_lock_irqsave(&s->lock, flags);
650
651 /* Mask termios capabilities we don't support */
652 termios->c_cflag &= ~CMSPAR;
653
654 /* Disable RX & TX, reset break condition, status and FIFOs */
655 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET |
656 CR_RX_DISABLE | CR_TX_DISABLE);
657 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET);
658 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET);
659 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET);
660
661 /* Word size */
662 switch (termios->c_cflag & CSIZE) {
663 case CS5:
664 mr1 = MR1_BITS_5;
665 break;
666 case CS6:
667 mr1 = MR1_BITS_6;
668 break;
669 case CS7:
670 mr1 = MR1_BITS_7;
671 break;
672 case CS8:
673 default:
674 mr1 = MR1_BITS_8;
675 break;
676 }
677
678 /* Parity */
679 if (termios->c_cflag & PARENB) {
680 if (termios->c_cflag & PARODD)
681 mr1 |= MR1_PAR_ODD;
682 } else
683 mr1 |= MR1_PAR_NO;
684
685 /* Stop bits */
686 mr2 = (termios->c_cflag & CSTOPB) ? MR2_STOP2 : MR2_STOP1;
687
688 /* Update desired format */
689 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR1);
690 sccnxp_port_write(port, SCCNXP_MR_REG, mr1);
691 sccnxp_port_write(port, SCCNXP_MR_REG, mr2);
692
693 /* Set read status mask */
694 port->read_status_mask = SR_OVR;
695 if (termios->c_iflag & INPCK)
696 port->read_status_mask |= SR_PE | SR_FE;
697 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
698 port->read_status_mask |= SR_BRK;
699
700 /* Set status ignore mask */
701 port->ignore_status_mask = 0;
702 if (termios->c_iflag & IGNBRK)
703 port->ignore_status_mask |= SR_BRK;
704 if (termios->c_iflag & IGNPAR)
705 port->ignore_status_mask |= SR_PE;
706 if (!(termios->c_cflag & CREAD))
707 port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK;
708
709 /* Setup baudrate */
710 baud = uart_get_baud_rate(port, termios, old, 50,
711 (s->chip->flags & SCCNXP_HAVE_MR0) ?
712 230400 : 38400);
713 baud = sccnxp_set_baud(port, baud);
714
715 /* Update timeout according to new baud rate */
716 uart_update_timeout(port, termios->c_cflag, baud);
717
718 /* Report actual baudrate back to core */
719 if (tty_termios_baud_rate(termios))
720 tty_termios_encode_baud_rate(termios, baud, baud);
721
722 /* Enable RX & TX */
723 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE);
724
725 spin_unlock_irqrestore(&s->lock, flags);
726}
727
728static int sccnxp_startup(struct uart_port *port)
729{
730 struct sccnxp_port *s = dev_get_drvdata(port->dev);
731 unsigned long flags;
732
733 spin_lock_irqsave(&s->lock, flags);
734
735 if (s->chip->flags & SCCNXP_HAVE_IO) {
736 /* Outputs are controlled manually */
737 sccnxp_write(port, SCCNXP_OPCR_REG, 0);
738 }
739
740 /* Reset break condition, status and FIFOs */
741 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET);
742 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET);
743 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET);
744 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET);
745
746 /* Enable RX & TX */
747 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE);
748
749 /* Enable RX interrupt */
750 sccnxp_enable_irq(port, IMR_RXRDY);
751
752 s->opened[port->line] = 1;
753
754 spin_unlock_irqrestore(&s->lock, flags);
755
756 return 0;
757}
758
759static void sccnxp_shutdown(struct uart_port *port)
760{
761 struct sccnxp_port *s = dev_get_drvdata(port->dev);
762 unsigned long flags;
763
764 spin_lock_irqsave(&s->lock, flags);
765
766 s->opened[port->line] = 0;
767
768 /* Disable interrupts */
769 sccnxp_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
770
771 /* Disable TX & RX */
772 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE | CR_TX_DISABLE);
773
774 /* Leave direction to input */
775 if (s->chip->flags & SCCNXP_HAVE_IO)
776 sccnxp_set_bit(port, DIR_OP, 0);
777
778 spin_unlock_irqrestore(&s->lock, flags);
779}
780
781static const char *sccnxp_type(struct uart_port *port)
782{
783 struct sccnxp_port *s = dev_get_drvdata(port->dev);
784
785 return (port->type == PORT_SC26XX) ? s->chip->name : NULL;
786}
787
788static void sccnxp_release_port(struct uart_port *port)
789{
790 /* Do nothing */
791}
792
793static int sccnxp_request_port(struct uart_port *port)
794{
795 /* Do nothing */
796 return 0;
797}
798
799static void sccnxp_config_port(struct uart_port *port, int flags)
800{
801 if (flags & UART_CONFIG_TYPE)
802 port->type = PORT_SC26XX;
803}
804
805static int sccnxp_verify_port(struct uart_port *port, struct serial_struct *s)
806{
807 if ((s->type == PORT_UNKNOWN) || (s->type == PORT_SC26XX))
808 return 0;
809 if (s->irq == port->irq)
810 return 0;
811
812 return -EINVAL;
813}
814
815static const struct uart_ops sccnxp_ops = {
816 .tx_empty = sccnxp_tx_empty,
817 .set_mctrl = sccnxp_set_mctrl,
818 .get_mctrl = sccnxp_get_mctrl,
819 .stop_tx = sccnxp_stop_tx,
820 .start_tx = sccnxp_start_tx,
821 .stop_rx = sccnxp_stop_rx,
822 .break_ctl = sccnxp_break_ctl,
823 .startup = sccnxp_startup,
824 .shutdown = sccnxp_shutdown,
825 .set_termios = sccnxp_set_termios,
826 .type = sccnxp_type,
827 .release_port = sccnxp_release_port,
828 .request_port = sccnxp_request_port,
829 .config_port = sccnxp_config_port,
830 .verify_port = sccnxp_verify_port,
831};
832
833#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
834static void sccnxp_console_putchar(struct uart_port *port, unsigned char c)
835{
836 int tryes = 100000;
837
838 while (tryes--) {
839 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXRDY) {
840 sccnxp_port_write(port, SCCNXP_THR_REG, c);
841 break;
842 }
843 barrier();
844 }
845}
846
847static void sccnxp_console_write(struct console *co, const char *c, unsigned n)
848{
849 struct sccnxp_port *s = (struct sccnxp_port *)co->data;
850 struct uart_port *port = &s->port[co->index];
851 unsigned long flags;
852
853 spin_lock_irqsave(&s->lock, flags);
854 uart_console_write(port, c, n, sccnxp_console_putchar);
855 spin_unlock_irqrestore(&s->lock, flags);
856}
857
858static int sccnxp_console_setup(struct console *co, char *options)
859{
860 struct sccnxp_port *s = (struct sccnxp_port *)co->data;
861 struct uart_port *port = &s->port[(co->index > 0) ? co->index : 0];
862 int baud = 9600, bits = 8, parity = 'n', flow = 'n';
863
864 if (options)
865 uart_parse_options(options, &baud, &parity, &bits, &flow);
866
867 return uart_set_options(port, co, baud, parity, bits, flow);
868}
869#endif
870
871static const struct platform_device_id sccnxp_id_table[] = {
872 { .name = "sc2681", .driver_data = (kernel_ulong_t)&sc2681, },
873 { .name = "sc2691", .driver_data = (kernel_ulong_t)&sc2691, },
874 { .name = "sc2692", .driver_data = (kernel_ulong_t)&sc2692, },
875 { .name = "sc2891", .driver_data = (kernel_ulong_t)&sc2891, },
876 { .name = "sc2892", .driver_data = (kernel_ulong_t)&sc2892, },
877 { .name = "sc28202", .driver_data = (kernel_ulong_t)&sc28202, },
878 { .name = "sc68681", .driver_data = (kernel_ulong_t)&sc68681, },
879 { .name = "sc68692", .driver_data = (kernel_ulong_t)&sc68692, },
880 { }
881};
882MODULE_DEVICE_TABLE(platform, sccnxp_id_table);
883
884static int sccnxp_probe(struct platform_device *pdev)
885{
886 struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev);
887 struct resource *res;
888 int i, ret, uartclk;
889 struct sccnxp_port *s;
890 void __iomem *membase;
891 struct clk *clk;
892
893 membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
894 if (IS_ERR(membase))
895 return PTR_ERR(membase);
896
897 s = devm_kzalloc(&pdev->dev, sizeof(struct sccnxp_port), GFP_KERNEL);
898 if (!s) {
899 dev_err(&pdev->dev, "Error allocating port structure\n");
900 return -ENOMEM;
901 }
902 platform_set_drvdata(pdev, s);
903
904 spin_lock_init(&s->lock);
905
906 s->chip = (struct sccnxp_chip *)pdev->id_entry->driver_data;
907
908 s->regulator = devm_regulator_get(&pdev->dev, "vcc");
909 if (!IS_ERR(s->regulator)) {
910 ret = regulator_enable(s->regulator);
911 if (ret) {
912 dev_err(&pdev->dev,
913 "Failed to enable regulator: %i\n", ret);
914 return ret;
915 }
916 } else if (PTR_ERR(s->regulator) == -EPROBE_DEFER)
917 return -EPROBE_DEFER;
918
919 clk = devm_clk_get_enabled(&pdev->dev, NULL);
920 if (IS_ERR(clk)) {
921 ret = PTR_ERR(clk);
922 if (ret == -EPROBE_DEFER)
923 goto err_out;
924 uartclk = 0;
925 } else {
926 uartclk = clk_get_rate(clk);
927 }
928
929 if (!uartclk) {
930 dev_notice(&pdev->dev, "Using default clock frequency\n");
931 uartclk = s->chip->freq_std;
932 }
933
934 /* Check input frequency */
935 if ((uartclk < s->chip->freq_min) || (uartclk > s->chip->freq_max)) {
936 dev_err(&pdev->dev, "Frequency out of bounds\n");
937 ret = -EINVAL;
938 goto err_out;
939 }
940
941 if (pdata)
942 memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));
943
944 if (s->pdata.poll_time_us) {
945 dev_info(&pdev->dev, "Using poll mode, resolution %u usecs\n",
946 s->pdata.poll_time_us);
947 s->poll = 1;
948 }
949
950 if (!s->poll) {
951 s->irq = platform_get_irq(pdev, 0);
952 if (s->irq < 0) {
953 ret = -ENXIO;
954 goto err_out;
955 }
956 }
957
958 s->uart.owner = THIS_MODULE;
959 s->uart.dev_name = "ttySC";
960 s->uart.major = SCCNXP_MAJOR;
961 s->uart.minor = SCCNXP_MINOR;
962 s->uart.nr = s->chip->nr;
963#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
964 s->uart.cons = &s->console;
965 s->uart.cons->device = uart_console_device;
966 s->uart.cons->write = sccnxp_console_write;
967 s->uart.cons->setup = sccnxp_console_setup;
968 s->uart.cons->flags = CON_PRINTBUFFER;
969 s->uart.cons->index = -1;
970 s->uart.cons->data = s;
971 strcpy(s->uart.cons->name, "ttySC");
972#endif
973 ret = uart_register_driver(&s->uart);
974 if (ret) {
975 dev_err(&pdev->dev, "Registering UART driver failed\n");
976 goto err_out;
977 }
978
979 for (i = 0; i < s->uart.nr; i++) {
980 s->port[i].line = i;
981 s->port[i].dev = &pdev->dev;
982 s->port[i].irq = s->irq;
983 s->port[i].type = PORT_SC26XX;
984 s->port[i].fifosize = s->chip->fifosize;
985 s->port[i].flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
986 s->port[i].iotype = UPIO_MEM;
987 s->port[i].mapbase = res->start;
988 s->port[i].membase = membase;
989 s->port[i].regshift = s->pdata.reg_shift;
990 s->port[i].uartclk = uartclk;
991 s->port[i].ops = &sccnxp_ops;
992 s->port[i].has_sysrq = IS_ENABLED(CONFIG_SERIAL_SCCNXP_CONSOLE);
993 uart_add_one_port(&s->uart, &s->port[i]);
994 /* Set direction to input */
995 if (s->chip->flags & SCCNXP_HAVE_IO)
996 sccnxp_set_bit(&s->port[i], DIR_OP, 0);
997 }
998
999 /* Disable interrupts */
1000 s->imr = 0;
1001 sccnxp_write(&s->port[0], SCCNXP_IMR_REG, 0);
1002
1003 if (!s->poll) {
1004 ret = devm_request_threaded_irq(&pdev->dev, s->irq, NULL,
1005 sccnxp_ist,
1006 IRQF_TRIGGER_FALLING |
1007 IRQF_ONESHOT,
1008 dev_name(&pdev->dev), s);
1009 if (!ret)
1010 return 0;
1011
1012 dev_err(&pdev->dev, "Unable to reguest IRQ %i\n", s->irq);
1013 } else {
1014 timer_setup(&s->timer, sccnxp_timer, 0);
1015 mod_timer(&s->timer, jiffies +
1016 usecs_to_jiffies(s->pdata.poll_time_us));
1017 return 0;
1018 }
1019
1020 uart_unregister_driver(&s->uart);
1021err_out:
1022 if (!IS_ERR(s->regulator))
1023 regulator_disable(s->regulator);
1024
1025 return ret;
1026}
1027
1028static void sccnxp_remove(struct platform_device *pdev)
1029{
1030 int i;
1031 struct sccnxp_port *s = platform_get_drvdata(pdev);
1032
1033 if (!s->poll)
1034 devm_free_irq(&pdev->dev, s->irq, s);
1035 else
1036 del_timer_sync(&s->timer);
1037
1038 for (i = 0; i < s->uart.nr; i++)
1039 uart_remove_one_port(&s->uart, &s->port[i]);
1040
1041 uart_unregister_driver(&s->uart);
1042
1043 if (!IS_ERR(s->regulator)) {
1044 int ret = regulator_disable(s->regulator);
1045 if (ret)
1046 dev_err(&pdev->dev, "Failed to disable regulator\n");
1047 }
1048}
1049
1050static struct platform_driver sccnxp_uart_driver = {
1051 .driver = {
1052 .name = SCCNXP_NAME,
1053 },
1054 .probe = sccnxp_probe,
1055 .remove = sccnxp_remove,
1056 .id_table = sccnxp_id_table,
1057};
1058module_platform_driver(sccnxp_uart_driver);
1059
1060MODULE_LICENSE("GPL v2");
1061MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
1062MODULE_DESCRIPTION("SCCNXP serial driver");