1
2
3
4
5
6#if defined(CONFIG_SERIAL_SPRD_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
7#define SUPPORT_SYSRQ
8#endif
9
10#include <linux/clk.h>
11#include <linux/console.h>
12#include <linux/delay.h>
13#include <linux/io.h>
14#include <linux/ioport.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/platform_device.h>
19#include <linux/serial_core.h>
20#include <linux/serial.h>
21#include <linux/slab.h>
22#include <linux/tty.h>
23#include <linux/tty_flip.h>
24
25
26#define UART_NR_MAX 8
27#define SPRD_TTY_NAME "ttyS"
28#define SPRD_FIFO_SIZE 128
29#define SPRD_DEF_RATE 26000000
30#define SPRD_BAUD_IO_LIMIT 3000000
31#define SPRD_TIMEOUT 256000
32
33
34
35#define SPRD_TXD 0x0000
36#define SPRD_RXD 0x0004
37
38
39#define SPRD_LSR 0x0008
40#define SPRD_LSR_OE BIT(4)
41#define SPRD_LSR_FE BIT(3)
42#define SPRD_LSR_PE BIT(2)
43#define SPRD_LSR_BI BIT(7)
44#define SPRD_LSR_TX_OVER BIT(15)
45
46
47#define SPRD_STS1 0x000C
48#define SPRD_RX_FIFO_CNT_MASK GENMASK(7, 0)
49#define SPRD_TX_FIFO_CNT_MASK GENMASK(15, 8)
50
51
52#define SPRD_IEN 0x0010
53#define SPRD_IEN_RX_FULL BIT(0)
54#define SPRD_IEN_TX_EMPTY BIT(1)
55#define SPRD_IEN_BREAK_DETECT BIT(7)
56#define SPRD_IEN_TIMEOUT BIT(13)
57
58
59#define SPRD_ICLR 0x0014
60#define SPRD_ICLR_TIMEOUT BIT(13)
61
62
63#define SPRD_LCR 0x0018
64#define SPRD_LCR_STOP_1BIT 0x10
65#define SPRD_LCR_STOP_2BIT 0x30
66#define SPRD_LCR_DATA_LEN (BIT(2) | BIT(3))
67#define SPRD_LCR_DATA_LEN5 0x0
68#define SPRD_LCR_DATA_LEN6 0x4
69#define SPRD_LCR_DATA_LEN7 0x8
70#define SPRD_LCR_DATA_LEN8 0xc
71#define SPRD_LCR_PARITY (BIT(0) | BIT(1))
72#define SPRD_LCR_PARITY_EN 0x2
73#define SPRD_LCR_EVEN_PAR 0x0
74#define SPRD_LCR_ODD_PAR 0x1
75
76
77#define SPRD_CTL1 0x001C
78#define RX_HW_FLOW_CTL_THLD BIT(6)
79#define RX_HW_FLOW_CTL_EN BIT(7)
80#define TX_HW_FLOW_CTL_EN BIT(8)
81#define RX_TOUT_THLD_DEF 0x3E00
82#define RX_HFC_THLD_DEF 0x40
83
84
85#define SPRD_CTL2 0x0020
86#define THLD_TX_EMPTY 0x40
87#define THLD_TX_EMPTY_SHIFT 8
88#define THLD_RX_FULL 0x40
89
90
91#define SPRD_CLKD0 0x0024
92#define SPRD_CLKD0_MASK GENMASK(15, 0)
93#define SPRD_CLKD1 0x0028
94#define SPRD_CLKD1_MASK GENMASK(20, 16)
95#define SPRD_CLKD1_SHIFT 16
96
97
98#define SPRD_IMSR 0x002C
99#define SPRD_IMSR_RX_FIFO_FULL BIT(0)
100#define SPRD_IMSR_TX_FIFO_EMPTY BIT(1)
101#define SPRD_IMSR_BREAK_DETECT BIT(7)
102#define SPRD_IMSR_TIMEOUT BIT(13)
103
104struct sprd_uart_port {
105 struct uart_port port;
106 char name[16];
107};
108
109static struct sprd_uart_port *sprd_port[UART_NR_MAX];
110static int sprd_ports_num;
111
112static inline unsigned int serial_in(struct uart_port *port,
113 unsigned int offset)
114{
115 return readl_relaxed(port->membase + offset);
116}
117
118static inline void serial_out(struct uart_port *port, unsigned int offset,
119 int value)
120{
121 writel_relaxed(value, port->membase + offset);
122}
123
124static unsigned int sprd_tx_empty(struct uart_port *port)
125{
126 if (serial_in(port, SPRD_STS1) & SPRD_TX_FIFO_CNT_MASK)
127 return 0;
128 else
129 return TIOCSER_TEMT;
130}
131
132static unsigned int sprd_get_mctrl(struct uart_port *port)
133{
134 return TIOCM_DSR | TIOCM_CTS;
135}
136
137static void sprd_set_mctrl(struct uart_port *port, unsigned int mctrl)
138{
139
140}
141
142static void sprd_stop_tx(struct uart_port *port)
143{
144 unsigned int ien, iclr;
145
146 iclr = serial_in(port, SPRD_ICLR);
147 ien = serial_in(port, SPRD_IEN);
148
149 iclr |= SPRD_IEN_TX_EMPTY;
150 ien &= ~SPRD_IEN_TX_EMPTY;
151
152 serial_out(port, SPRD_ICLR, iclr);
153 serial_out(port, SPRD_IEN, ien);
154}
155
156static void sprd_start_tx(struct uart_port *port)
157{
158 unsigned int ien;
159
160 ien = serial_in(port, SPRD_IEN);
161 if (!(ien & SPRD_IEN_TX_EMPTY)) {
162 ien |= SPRD_IEN_TX_EMPTY;
163 serial_out(port, SPRD_IEN, ien);
164 }
165}
166
167static void sprd_stop_rx(struct uart_port *port)
168{
169 unsigned int ien, iclr;
170
171 iclr = serial_in(port, SPRD_ICLR);
172 ien = serial_in(port, SPRD_IEN);
173
174 ien &= ~(SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT);
175 iclr |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT;
176
177 serial_out(port, SPRD_IEN, ien);
178 serial_out(port, SPRD_ICLR, iclr);
179}
180
181
182static void sprd_break_ctl(struct uart_port *port, int break_state)
183{
184
185}
186
187static int handle_lsr_errors(struct uart_port *port,
188 unsigned int *flag,
189 unsigned int *lsr)
190{
191 int ret = 0;
192
193
194 if (*lsr & SPRD_LSR_BI) {
195 *lsr &= ~(SPRD_LSR_FE | SPRD_LSR_PE);
196 port->icount.brk++;
197 ret = uart_handle_break(port);
198 if (ret)
199 return ret;
200 } else if (*lsr & SPRD_LSR_PE)
201 port->icount.parity++;
202 else if (*lsr & SPRD_LSR_FE)
203 port->icount.frame++;
204 if (*lsr & SPRD_LSR_OE)
205 port->icount.overrun++;
206
207
208 *lsr &= port->read_status_mask;
209 if (*lsr & SPRD_LSR_BI)
210 *flag = TTY_BREAK;
211 else if (*lsr & SPRD_LSR_PE)
212 *flag = TTY_PARITY;
213 else if (*lsr & SPRD_LSR_FE)
214 *flag = TTY_FRAME;
215
216 return ret;
217}
218
219static inline void sprd_rx(struct uart_port *port)
220{
221 struct tty_port *tty = &port->state->port;
222 unsigned int ch, flag, lsr, max_count = SPRD_TIMEOUT;
223
224 while ((serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK) &&
225 max_count--) {
226 lsr = serial_in(port, SPRD_LSR);
227 ch = serial_in(port, SPRD_RXD);
228 flag = TTY_NORMAL;
229 port->icount.rx++;
230
231 if (lsr & (SPRD_LSR_BI | SPRD_LSR_PE |
232 SPRD_LSR_FE | SPRD_LSR_OE))
233 if (handle_lsr_errors(port, &lsr, &flag))
234 continue;
235 if (uart_handle_sysrq_char(port, ch))
236 continue;
237
238 uart_insert_char(port, lsr, SPRD_LSR_OE, ch, flag);
239 }
240
241 tty_flip_buffer_push(tty);
242}
243
244static inline void sprd_tx(struct uart_port *port)
245{
246 struct circ_buf *xmit = &port->state->xmit;
247 int count;
248
249 if (port->x_char) {
250 serial_out(port, SPRD_TXD, port->x_char);
251 port->icount.tx++;
252 port->x_char = 0;
253 return;
254 }
255
256 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
257 sprd_stop_tx(port);
258 return;
259 }
260
261 count = THLD_TX_EMPTY;
262 do {
263 serial_out(port, SPRD_TXD, xmit->buf[xmit->tail]);
264 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
265 port->icount.tx++;
266 if (uart_circ_empty(xmit))
267 break;
268 } while (--count > 0);
269
270 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
271 uart_write_wakeup(port);
272
273 if (uart_circ_empty(xmit))
274 sprd_stop_tx(port);
275}
276
277
278static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
279{
280 struct uart_port *port = dev_id;
281 unsigned int ims;
282
283 spin_lock(&port->lock);
284
285 ims = serial_in(port, SPRD_IMSR);
286
287 if (!ims) {
288 spin_unlock(&port->lock);
289 return IRQ_NONE;
290 }
291
292 if (ims & SPRD_IMSR_TIMEOUT)
293 serial_out(port, SPRD_ICLR, SPRD_ICLR_TIMEOUT);
294
295 if (ims & (SPRD_IMSR_RX_FIFO_FULL | SPRD_IMSR_BREAK_DETECT |
296 SPRD_IMSR_TIMEOUT))
297 sprd_rx(port);
298
299 if (ims & SPRD_IMSR_TX_FIFO_EMPTY)
300 sprd_tx(port);
301
302 spin_unlock(&port->lock);
303
304 return IRQ_HANDLED;
305}
306
307static int sprd_startup(struct uart_port *port)
308{
309 int ret = 0;
310 unsigned int ien, fc;
311 unsigned int timeout;
312 struct sprd_uart_port *sp;
313 unsigned long flags;
314
315 serial_out(port, SPRD_CTL2,
316 THLD_TX_EMPTY << THLD_TX_EMPTY_SHIFT | THLD_RX_FULL);
317
318
319 timeout = SPRD_TIMEOUT;
320 while (timeout-- && serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK)
321 serial_in(port, SPRD_RXD);
322
323
324 timeout = SPRD_TIMEOUT;
325 while (timeout-- && serial_in(port, SPRD_STS1) & SPRD_TX_FIFO_CNT_MASK)
326 cpu_relax();
327
328
329 serial_out(port, SPRD_IEN, 0);
330 serial_out(port, SPRD_ICLR, ~0);
331
332
333 sp = container_of(port, struct sprd_uart_port, port);
334 snprintf(sp->name, sizeof(sp->name), "sprd_serial%d", port->line);
335 ret = devm_request_irq(port->dev, port->irq, sprd_handle_irq,
336 IRQF_SHARED, sp->name, port);
337 if (ret) {
338 dev_err(port->dev, "fail to request serial irq %d, ret=%d\n",
339 port->irq, ret);
340 return ret;
341 }
342 fc = serial_in(port, SPRD_CTL1);
343 fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
344 serial_out(port, SPRD_CTL1, fc);
345
346
347 spin_lock_irqsave(&port->lock, flags);
348 ien = serial_in(port, SPRD_IEN);
349 ien |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT | SPRD_IEN_TIMEOUT;
350 serial_out(port, SPRD_IEN, ien);
351 spin_unlock_irqrestore(&port->lock, flags);
352
353 return 0;
354}
355
356static void sprd_shutdown(struct uart_port *port)
357{
358 serial_out(port, SPRD_IEN, 0);
359 serial_out(port, SPRD_ICLR, ~0);
360 devm_free_irq(port->dev, port->irq, port);
361}
362
363static void sprd_set_termios(struct uart_port *port,
364 struct ktermios *termios,
365 struct ktermios *old)
366{
367 unsigned int baud, quot;
368 unsigned int lcr = 0, fc;
369 unsigned long flags;
370
371
372 baud = uart_get_baud_rate(port, termios, old, 0, SPRD_BAUD_IO_LIMIT);
373
374 quot = (unsigned int)((port->uartclk + baud / 2) / baud);
375
376
377 switch (termios->c_cflag & CSIZE) {
378 case CS5:
379 lcr |= SPRD_LCR_DATA_LEN5;
380 break;
381 case CS6:
382 lcr |= SPRD_LCR_DATA_LEN6;
383 break;
384 case CS7:
385 lcr |= SPRD_LCR_DATA_LEN7;
386 break;
387 case CS8:
388 default:
389 lcr |= SPRD_LCR_DATA_LEN8;
390 break;
391 }
392
393
394 lcr &= ~(SPRD_LCR_STOP_1BIT | SPRD_LCR_STOP_2BIT);
395 if (termios->c_cflag & CSTOPB)
396 lcr |= SPRD_LCR_STOP_2BIT;
397 else
398 lcr |= SPRD_LCR_STOP_1BIT;
399
400
401 lcr &= ~SPRD_LCR_PARITY;
402 termios->c_cflag &= ~CMSPAR;
403 if (termios->c_cflag & PARENB) {
404 lcr |= SPRD_LCR_PARITY_EN;
405 if (termios->c_cflag & PARODD)
406 lcr |= SPRD_LCR_ODD_PAR;
407 else
408 lcr |= SPRD_LCR_EVEN_PAR;
409 }
410
411 spin_lock_irqsave(&port->lock, flags);
412
413
414 uart_update_timeout(port, termios->c_cflag, baud);
415
416 port->read_status_mask = SPRD_LSR_OE;
417 if (termios->c_iflag & INPCK)
418 port->read_status_mask |= SPRD_LSR_FE | SPRD_LSR_PE;
419 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
420 port->read_status_mask |= SPRD_LSR_BI;
421
422
423 port->ignore_status_mask = 0;
424 if (termios->c_iflag & IGNPAR)
425 port->ignore_status_mask |= SPRD_LSR_PE | SPRD_LSR_FE;
426 if (termios->c_iflag & IGNBRK) {
427 port->ignore_status_mask |= SPRD_LSR_BI;
428
429
430
431
432 if (termios->c_iflag & IGNPAR)
433 port->ignore_status_mask |= SPRD_LSR_OE;
434 }
435
436
437 fc = serial_in(port, SPRD_CTL1);
438 fc &= ~(RX_HW_FLOW_CTL_THLD | RX_HW_FLOW_CTL_EN | TX_HW_FLOW_CTL_EN);
439 if (termios->c_cflag & CRTSCTS) {
440 fc |= RX_HW_FLOW_CTL_THLD;
441 fc |= RX_HW_FLOW_CTL_EN;
442 fc |= TX_HW_FLOW_CTL_EN;
443 }
444
445
446 serial_out(port, SPRD_CLKD0, quot & SPRD_CLKD0_MASK);
447
448
449 serial_out(port, SPRD_CLKD1,
450 (quot & SPRD_CLKD1_MASK) >> SPRD_CLKD1_SHIFT);
451 serial_out(port, SPRD_LCR, lcr);
452 fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
453 serial_out(port, SPRD_CTL1, fc);
454
455 spin_unlock_irqrestore(&port->lock, flags);
456
457
458 if (tty_termios_baud_rate(termios))
459 tty_termios_encode_baud_rate(termios, baud, baud);
460}
461
462static const char *sprd_type(struct uart_port *port)
463{
464 return "SPX";
465}
466
467static void sprd_release_port(struct uart_port *port)
468{
469
470}
471
472static int sprd_request_port(struct uart_port *port)
473{
474 return 0;
475}
476
477static void sprd_config_port(struct uart_port *port, int flags)
478{
479 if (flags & UART_CONFIG_TYPE)
480 port->type = PORT_SPRD;
481}
482
483static int sprd_verify_port(struct uart_port *port, struct serial_struct *ser)
484{
485 if (ser->type != PORT_SPRD)
486 return -EINVAL;
487 if (port->irq != ser->irq)
488 return -EINVAL;
489 if (port->iotype != ser->io_type)
490 return -EINVAL;
491 return 0;
492}
493
494static const struct uart_ops serial_sprd_ops = {
495 .tx_empty = sprd_tx_empty,
496 .get_mctrl = sprd_get_mctrl,
497 .set_mctrl = sprd_set_mctrl,
498 .stop_tx = sprd_stop_tx,
499 .start_tx = sprd_start_tx,
500 .stop_rx = sprd_stop_rx,
501 .break_ctl = sprd_break_ctl,
502 .startup = sprd_startup,
503 .shutdown = sprd_shutdown,
504 .set_termios = sprd_set_termios,
505 .type = sprd_type,
506 .release_port = sprd_release_port,
507 .request_port = sprd_request_port,
508 .config_port = sprd_config_port,
509 .verify_port = sprd_verify_port,
510};
511
512#ifdef CONFIG_SERIAL_SPRD_CONSOLE
513static void wait_for_xmitr(struct uart_port *port)
514{
515 unsigned int status, tmout = 10000;
516
517
518 do {
519 status = serial_in(port, SPRD_STS1);
520 if (--tmout == 0)
521 break;
522 udelay(1);
523 } while (status & SPRD_TX_FIFO_CNT_MASK);
524}
525
526static void sprd_console_putchar(struct uart_port *port, int ch)
527{
528 wait_for_xmitr(port);
529 serial_out(port, SPRD_TXD, ch);
530}
531
532static void sprd_console_write(struct console *co, const char *s,
533 unsigned int count)
534{
535 struct uart_port *port = &sprd_port[co->index]->port;
536 int locked = 1;
537 unsigned long flags;
538
539 if (port->sysrq)
540 locked = 0;
541 else if (oops_in_progress)
542 locked = spin_trylock_irqsave(&port->lock, flags);
543 else
544 spin_lock_irqsave(&port->lock, flags);
545
546 uart_console_write(port, s, count, sprd_console_putchar);
547
548
549 wait_for_xmitr(port);
550
551 if (locked)
552 spin_unlock_irqrestore(&port->lock, flags);
553}
554
555static int __init sprd_console_setup(struct console *co, char *options)
556{
557 struct uart_port *port;
558 int baud = 115200;
559 int bits = 8;
560 int parity = 'n';
561 int flow = 'n';
562
563 if (co->index >= UART_NR_MAX || co->index < 0)
564 co->index = 0;
565
566 port = &sprd_port[co->index]->port;
567 if (port == NULL) {
568 pr_info("serial port %d not yet initialized\n", co->index);
569 return -ENODEV;
570 }
571 if (options)
572 uart_parse_options(options, &baud, &parity, &bits, &flow);
573
574 return uart_set_options(port, co, baud, parity, bits, flow);
575}
576
577static struct uart_driver sprd_uart_driver;
578static struct console sprd_console = {
579 .name = SPRD_TTY_NAME,
580 .write = sprd_console_write,
581 .device = uart_console_device,
582 .setup = sprd_console_setup,
583 .flags = CON_PRINTBUFFER,
584 .index = -1,
585 .data = &sprd_uart_driver,
586};
587
588#define SPRD_CONSOLE (&sprd_console)
589
590
591static void sprd_putc(struct uart_port *port, int c)
592{
593 unsigned int timeout = SPRD_TIMEOUT;
594
595 while (timeout-- &&
596 !(readl(port->membase + SPRD_LSR) & SPRD_LSR_TX_OVER))
597 cpu_relax();
598
599 writeb(c, port->membase + SPRD_TXD);
600}
601
602static void sprd_early_write(struct console *con, const char *s, unsigned int n)
603{
604 struct earlycon_device *dev = con->data;
605
606 uart_console_write(&dev->port, s, n, sprd_putc);
607}
608
609static int __init sprd_early_console_setup(struct earlycon_device *device,
610 const char *opt)
611{
612 if (!device->port.membase)
613 return -ENODEV;
614
615 device->con->write = sprd_early_write;
616 return 0;
617}
618OF_EARLYCON_DECLARE(sprd_serial, "sprd,sc9836-uart",
619 sprd_early_console_setup);
620
621#else
622#define SPRD_CONSOLE NULL
623#endif
624
625static struct uart_driver sprd_uart_driver = {
626 .owner = THIS_MODULE,
627 .driver_name = "sprd_serial",
628 .dev_name = SPRD_TTY_NAME,
629 .major = 0,
630 .minor = 0,
631 .nr = UART_NR_MAX,
632 .cons = SPRD_CONSOLE,
633};
634
635static int sprd_probe_dt_alias(int index, struct device *dev)
636{
637 struct device_node *np;
638 int ret = index;
639
640 if (!IS_ENABLED(CONFIG_OF))
641 return ret;
642
643 np = dev->of_node;
644 if (!np)
645 return ret;
646
647 ret = of_alias_get_id(np, "serial");
648 if (ret < 0)
649 ret = index;
650 else if (ret >= ARRAY_SIZE(sprd_port) || sprd_port[ret] != NULL) {
651 dev_warn(dev, "requested serial port %d not available.\n", ret);
652 ret = index;
653 }
654
655 return ret;
656}
657
658static int sprd_remove(struct platform_device *dev)
659{
660 struct sprd_uart_port *sup = platform_get_drvdata(dev);
661
662 if (sup) {
663 uart_remove_one_port(&sprd_uart_driver, &sup->port);
664 sprd_port[sup->port.line] = NULL;
665 sprd_ports_num--;
666 }
667
668 if (!sprd_ports_num)
669 uart_unregister_driver(&sprd_uart_driver);
670
671 return 0;
672}
673
674static int sprd_probe(struct platform_device *pdev)
675{
676 struct resource *res;
677 struct uart_port *up;
678 struct clk *clk;
679 int irq;
680 int index;
681 int ret;
682
683 for (index = 0; index < ARRAY_SIZE(sprd_port); index++)
684 if (sprd_port[index] == NULL)
685 break;
686
687 if (index == ARRAY_SIZE(sprd_port))
688 return -EBUSY;
689
690 index = sprd_probe_dt_alias(index, &pdev->dev);
691
692 sprd_port[index] = devm_kzalloc(&pdev->dev, sizeof(*sprd_port[index]),
693 GFP_KERNEL);
694 if (!sprd_port[index])
695 return -ENOMEM;
696
697 up = &sprd_port[index]->port;
698 up->dev = &pdev->dev;
699 up->line = index;
700 up->type = PORT_SPRD;
701 up->iotype = UPIO_MEM;
702 up->uartclk = SPRD_DEF_RATE;
703 up->fifosize = SPRD_FIFO_SIZE;
704 up->ops = &serial_sprd_ops;
705 up->flags = UPF_BOOT_AUTOCONF;
706
707 clk = devm_clk_get(&pdev->dev, NULL);
708 if (!IS_ERR_OR_NULL(clk))
709 up->uartclk = clk_get_rate(clk);
710
711 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
712 up->membase = devm_ioremap_resource(&pdev->dev, res);
713 if (IS_ERR(up->membase))
714 return PTR_ERR(up->membase);
715
716 up->mapbase = res->start;
717
718 irq = platform_get_irq(pdev, 0);
719 if (irq < 0) {
720 dev_err(&pdev->dev, "not provide irq resource: %d\n", irq);
721 return irq;
722 }
723 up->irq = irq;
724
725 if (!sprd_ports_num) {
726 ret = uart_register_driver(&sprd_uart_driver);
727 if (ret < 0) {
728 pr_err("Failed to register SPRD-UART driver\n");
729 return ret;
730 }
731 }
732 sprd_ports_num++;
733
734 ret = uart_add_one_port(&sprd_uart_driver, up);
735 if (ret) {
736 sprd_port[index] = NULL;
737 sprd_remove(pdev);
738 }
739
740 platform_set_drvdata(pdev, up);
741
742 return ret;
743}
744
745#ifdef CONFIG_PM_SLEEP
746static int sprd_suspend(struct device *dev)
747{
748 struct sprd_uart_port *sup = dev_get_drvdata(dev);
749
750 uart_suspend_port(&sprd_uart_driver, &sup->port);
751
752 return 0;
753}
754
755static int sprd_resume(struct device *dev)
756{
757 struct sprd_uart_port *sup = dev_get_drvdata(dev);
758
759 uart_resume_port(&sprd_uart_driver, &sup->port);
760
761 return 0;
762}
763#endif
764
765static SIMPLE_DEV_PM_OPS(sprd_pm_ops, sprd_suspend, sprd_resume);
766
767static const struct of_device_id serial_ids[] = {
768 {.compatible = "sprd,sc9836-uart",},
769 {}
770};
771MODULE_DEVICE_TABLE(of, serial_ids);
772
773static struct platform_driver sprd_platform_driver = {
774 .probe = sprd_probe,
775 .remove = sprd_remove,
776 .driver = {
777 .name = "sprd_serial",
778 .of_match_table = of_match_ptr(serial_ids),
779 .pm = &sprd_pm_ops,
780 },
781};
782
783module_platform_driver(sprd_platform_driver);
784
785MODULE_LICENSE("GPL v2");
786MODULE_DESCRIPTION("Spreadtrum SoC serial driver series");
787
