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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / tty / serial / meson_uart.c
blob8a842591b37c714f976ab23f39663ced5528508f
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Based on meson_uart.c, by AMLOGIC, INC.
4 *
5 * Copyright (C) 2014 Carlo Caione <carlo@caione.org>
6 */
7
8 #if defined(CONFIG_SERIAL_MESON_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
9 #define SUPPORT_SYSRQ
10 #endif
11
12 #include <linux/clk.h>
13 #include <linux/console.h>
14 #include <linux/delay.h>
15 #include <linux/init.h>
16 #include <linux/io.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/serial.h>
22 #include <linux/serial_core.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25
26 /* Register offsets */
27 #define AML_UART_WFIFO 0x00
28 #define AML_UART_RFIFO 0x04
29 #define AML_UART_CONTROL 0x08
30 #define AML_UART_STATUS 0x0c
31 #define AML_UART_MISC 0x10
32 #define AML_UART_REG5 0x14
33
34 /* AML_UART_CONTROL bits */
35 #define AML_UART_TX_EN BIT(12)
36 #define AML_UART_RX_EN BIT(13)
37 #define AML_UART_TWO_WIRE_EN BIT(15)
38 #define AML_UART_STOP_BIT_LEN_MASK (0x03 << 16)
39 #define AML_UART_STOP_BIT_1SB (0x00 << 16)
40 #define AML_UART_STOP_BIT_2SB (0x01 << 16)
41 #define AML_UART_PARITY_TYPE BIT(18)
42 #define AML_UART_PARITY_EN BIT(19)
43 #define AML_UART_TX_RST BIT(22)
44 #define AML_UART_RX_RST BIT(23)
45 #define AML_UART_CLEAR_ERR BIT(24)
46 #define AML_UART_RX_INT_EN BIT(27)
47 #define AML_UART_TX_INT_EN BIT(28)
48 #define AML_UART_DATA_LEN_MASK (0x03 << 20)
49 #define AML_UART_DATA_LEN_8BIT (0x00 << 20)
50 #define AML_UART_DATA_LEN_7BIT (0x01 << 20)
51 #define AML_UART_DATA_LEN_6BIT (0x02 << 20)
52 #define AML_UART_DATA_LEN_5BIT (0x03 << 20)
53
54 /* AML_UART_STATUS bits */
55 #define AML_UART_PARITY_ERR BIT(16)
56 #define AML_UART_FRAME_ERR BIT(17)
57 #define AML_UART_TX_FIFO_WERR BIT(18)
58 #define AML_UART_RX_EMPTY BIT(20)
59 #define AML_UART_TX_FULL BIT(21)
60 #define AML_UART_TX_EMPTY BIT(22)
61 #define AML_UART_XMIT_BUSY BIT(25)
62 #define AML_UART_ERR (AML_UART_PARITY_ERR | \
63 AML_UART_FRAME_ERR | \
64 AML_UART_TX_FIFO_WERR)
65
66 /* AML_UART_MISC bits */
67 #define AML_UART_XMIT_IRQ(c) (((c) & 0xff) << 8)
68 #define AML_UART_RECV_IRQ(c) ((c) & 0xff)
69
70 /* AML_UART_REG5 bits */
71 #define AML_UART_BAUD_MASK 0x7fffff
72 #define AML_UART_BAUD_USE BIT(23)
73 #define AML_UART_BAUD_XTAL BIT(24)
74
75 #define AML_UART_PORT_NUM 6
76 #define AML_UART_DEV_NAME "ttyAML"
77
78
79 static struct uart_driver meson_uart_driver;
80
81 static struct uart_port *meson_ports[AML_UART_PORT_NUM];
82
83 static void meson_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
84 {
85 }
86
87 static unsigned int meson_uart_get_mctrl(struct uart_port *port)
88 {
89 return TIOCM_CTS;
90 }
91
92 static unsigned int meson_uart_tx_empty(struct uart_port *port)
93 {
94 u32 val;
95
96 val = readl(port->membase + AML_UART_STATUS);
97 val &= (AML_UART_TX_EMPTY | AML_UART_XMIT_BUSY);
98 return (val == AML_UART_TX_EMPTY) ? TIOCSER_TEMT : 0;
99 }
100
101 static void meson_uart_stop_tx(struct uart_port *port)
102 {
103 u32 val;
104
105 val = readl(port->membase + AML_UART_CONTROL);
106 val &= ~AML_UART_TX_INT_EN;
107 writel(val, port->membase + AML_UART_CONTROL);
108 }
109
110 static void meson_uart_stop_rx(struct uart_port *port)
111 {
112 u32 val;
113
114 val = readl(port->membase + AML_UART_CONTROL);
115 val &= ~AML_UART_RX_EN;
116 writel(val, port->membase + AML_UART_CONTROL);
117 }
118
119 static void meson_uart_shutdown(struct uart_port *port)
120 {
121 unsigned long flags;
122 u32 val;
123
124 free_irq(port->irq, port);
125
126 spin_lock_irqsave(&port->lock, flags);
127
128 val = readl(port->membase + AML_UART_CONTROL);
129 val &= ~AML_UART_RX_EN;
130 val &= ~(AML_UART_RX_INT_EN | AML_UART_TX_INT_EN);
131 writel(val, port->membase + AML_UART_CONTROL);
132
133 spin_unlock_irqrestore(&port->lock, flags);
134 }
135
136 static void meson_uart_start_tx(struct uart_port *port)
137 {
138 struct circ_buf *xmit = &port->state->xmit;
139 unsigned int ch;
140 u32 val;
141
142 if (uart_tx_stopped(port)) {
143 meson_uart_stop_tx(port);
144 return;
145 }
146
147 while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)) {
148 if (port->x_char) {
149 writel(port->x_char, port->membase + AML_UART_WFIFO);
150 port->icount.tx++;
151 port->x_char = 0;
152 continue;
153 }
154
155 if (uart_circ_empty(xmit))
156 break;
157
158 ch = xmit->buf[xmit->tail];
159 writel(ch, port->membase + AML_UART_WFIFO);
160 xmit->tail = (xmit->tail+1) & (SERIAL_XMIT_SIZE - 1);
161 port->icount.tx++;
162 }
163
164 if (!uart_circ_empty(xmit)) {
165 val = readl(port->membase + AML_UART_CONTROL);
166 val |= AML_UART_TX_INT_EN;
167 writel(val, port->membase + AML_UART_CONTROL);
168 }
169
170 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
171 uart_write_wakeup(port);
172 }
173
174 static void meson_receive_chars(struct uart_port *port)
175 {
176 struct tty_port *tport = &port->state->port;
177 char flag;
178 u32 ostatus, status, ch, mode;
179
180 do {
181 flag = TTY_NORMAL;
182 port->icount.rx++;
183 ostatus = status = readl(port->membase + AML_UART_STATUS);
184
185 if (status & AML_UART_ERR) {
186 if (status & AML_UART_TX_FIFO_WERR)
187 port->icount.overrun++;
188 else if (status & AML_UART_FRAME_ERR)
189 port->icount.frame++;
190 else if (status & AML_UART_PARITY_ERR)
191 port->icount.frame++;
192
193 mode = readl(port->membase + AML_UART_CONTROL);
194 mode |= AML_UART_CLEAR_ERR;
195 writel(mode, port->membase + AML_UART_CONTROL);
196
197 /* It doesn't clear to 0 automatically */
198 mode &= ~AML_UART_CLEAR_ERR;
199 writel(mode, port->membase + AML_UART_CONTROL);
200
201 status &= port->read_status_mask;
202 if (status & AML_UART_FRAME_ERR)
203 flag = TTY_FRAME;
204 else if (status & AML_UART_PARITY_ERR)
205 flag = TTY_PARITY;
206 }
207
208 ch = readl(port->membase + AML_UART_RFIFO);
209 ch &= 0xff;
210
211 if ((ostatus & AML_UART_FRAME_ERR) && (ch == 0)) {
212 port->icount.brk++;
213 flag = TTY_BREAK;
214 if (uart_handle_break(port))
215 continue;
216 }
217
218 if (uart_handle_sysrq_char(port, ch))
219 continue;
220
221 if ((status & port->ignore_status_mask) == 0)
222 tty_insert_flip_char(tport, ch, flag);
223
224 if (status & AML_UART_TX_FIFO_WERR)
225 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
226
227 } while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY));
228
229 spin_unlock(&port->lock);
230 tty_flip_buffer_push(tport);
231 spin_lock(&port->lock);
232 }
233
234 static irqreturn_t meson_uart_interrupt(int irq, void *dev_id)
235 {
236 struct uart_port *port = (struct uart_port *)dev_id;
237
238 spin_lock(&port->lock);
239
240 if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY))
241 meson_receive_chars(port);
242
243 if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)) {
244 if (readl(port->membase + AML_UART_CONTROL) & AML_UART_TX_INT_EN)
245 meson_uart_start_tx(port);
246 }
247
248 spin_unlock(&port->lock);
249
250 return IRQ_HANDLED;
251 }
252
253 static const char *meson_uart_type(struct uart_port *port)
254 {
255 return (port->type == PORT_MESON) ? "meson_uart" : NULL;
256 }
257
258 static void meson_uart_reset(struct uart_port *port)
259 {
260 u32 val;
261
262 val = readl(port->membase + AML_UART_CONTROL);
263 val |= (AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLEAR_ERR);
264 writel(val, port->membase + AML_UART_CONTROL);
265
266 val &= ~(AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLEAR_ERR);
267 writel(val, port->membase + AML_UART_CONTROL);
268 }
269
270 static int meson_uart_startup(struct uart_port *port)
271 {
272 u32 val;
273 int ret = 0;
274
275 val = readl(port->membase + AML_UART_CONTROL);
276 val |= AML_UART_CLEAR_ERR;
277 writel(val, port->membase + AML_UART_CONTROL);
278 val &= ~AML_UART_CLEAR_ERR;
279 writel(val, port->membase + AML_UART_CONTROL);
280
281 val |= (AML_UART_RX_EN | AML_UART_TX_EN);
282 writel(val, port->membase + AML_UART_CONTROL);
283
284 val |= (AML_UART_RX_INT_EN | AML_UART_TX_INT_EN);
285 writel(val, port->membase + AML_UART_CONTROL);
286
287 val = (AML_UART_RECV_IRQ(1) | AML_UART_XMIT_IRQ(port->fifosize / 2));
288 writel(val, port->membase + AML_UART_MISC);
289
290 ret = request_irq(port->irq, meson_uart_interrupt, 0,
291 port->name, port);
292
293 return ret;
294 }
295
296 static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
297 {
298 u32 val;
299
300 while (!meson_uart_tx_empty(port))
301 cpu_relax();
302
303 if (port->uartclk == 24000000) {
304 val = ((port->uartclk / 3) / baud) - 1;
305 val |= AML_UART_BAUD_XTAL;
306 } else {
307 val = ((port->uartclk * 10 / (baud * 4) + 5) / 10) - 1;
308 }
309 val |= AML_UART_BAUD_USE;
310 writel(val, port->membase + AML_UART_REG5);
311 }
312
313 static void meson_uart_set_termios(struct uart_port *port,
314 struct ktermios *termios,
315 struct ktermios *old)
316 {
317 unsigned int cflags, iflags, baud;
318 unsigned long flags;
319 u32 val;
320
321 spin_lock_irqsave(&port->lock, flags);
322
323 cflags = termios->c_cflag;
324 iflags = termios->c_iflag;
325
326 val = readl(port->membase + AML_UART_CONTROL);
327
328 val &= ~AML_UART_DATA_LEN_MASK;
329 switch (cflags & CSIZE) {
330 case CS8:
331 val |= AML_UART_DATA_LEN_8BIT;
332 break;
333 case CS7:
334 val |= AML_UART_DATA_LEN_7BIT;
335 break;
336 case CS6:
337 val |= AML_UART_DATA_LEN_6BIT;
338 break;
339 case CS5:
340 val |= AML_UART_DATA_LEN_5BIT;
341 break;
342 }
343
344 if (cflags & PARENB)
345 val |= AML_UART_PARITY_EN;
346 else
347 val &= ~AML_UART_PARITY_EN;
348
349 if (cflags & PARODD)
350 val |= AML_UART_PARITY_TYPE;
351 else
352 val &= ~AML_UART_PARITY_TYPE;
353
354 val &= ~AML_UART_STOP_BIT_LEN_MASK;
355 if (cflags & CSTOPB)
356 val |= AML_UART_STOP_BIT_2SB;
357 else
358 val |= AML_UART_STOP_BIT_1SB;
359
360 if (cflags & CRTSCTS)
361 val &= ~AML_UART_TWO_WIRE_EN;
362 else
363 val |= AML_UART_TWO_WIRE_EN;
364
365 writel(val, port->membase + AML_UART_CONTROL);
366
367 baud = uart_get_baud_rate(port, termios, old, 50, 4000000);
368 meson_uart_change_speed(port, baud);
369
370 port->read_status_mask = AML_UART_TX_FIFO_WERR;
371 if (iflags & INPCK)
372 port->read_status_mask |= AML_UART_PARITY_ERR |
373 AML_UART_FRAME_ERR;
374
375 port->ignore_status_mask = 0;
376 if (iflags & IGNPAR)
377 port->ignore_status_mask |= AML_UART_PARITY_ERR |
378 AML_UART_FRAME_ERR;
379
380 uart_update_timeout(port, termios->c_cflag, baud);
381 spin_unlock_irqrestore(&port->lock, flags);
382 }
383
384 static int meson_uart_verify_port(struct uart_port *port,
385 struct serial_struct *ser)
386 {
387 int ret = 0;
388
389 if (port->type != PORT_MESON)
390 ret = -EINVAL;
391 if (port->irq != ser->irq)
392 ret = -EINVAL;
393 if (ser->baud_base < 9600)
394 ret = -EINVAL;
395 return ret;
396 }
397
398 static void meson_uart_release_port(struct uart_port *port)
399 {
400 devm_iounmap(port->dev, port->membase);
401 port->membase = NULL;
402 devm_release_mem_region(port->dev, port->mapbase, port->mapsize);
403 }
404
405 static int meson_uart_request_port(struct uart_port *port)
406 {
407 if (!devm_request_mem_region(port->dev, port->mapbase, port->mapsize,
408 dev_name(port->dev))) {
409 dev_err(port->dev, "Memory region busy\n");
410 return -EBUSY;
411 }
412
413 port->membase = devm_ioremap_nocache(port->dev, port->mapbase,
414 port->mapsize);
415 if (!port->membase)
416 return -ENOMEM;
417
418 return 0;
419 }
420
421 static void meson_uart_config_port(struct uart_port *port, int flags)
422 {
423 if (flags & UART_CONFIG_TYPE) {
424 port->type = PORT_MESON;
425 meson_uart_request_port(port);
426 }
427 }
428
429 static const struct uart_ops meson_uart_ops = {
430 .set_mctrl = meson_uart_set_mctrl,
431 .get_mctrl = meson_uart_get_mctrl,
432 .tx_empty = meson_uart_tx_empty,
433 .start_tx = meson_uart_start_tx,
434 .stop_tx = meson_uart_stop_tx,
435 .stop_rx = meson_uart_stop_rx,
436 .startup = meson_uart_startup,
437 .shutdown = meson_uart_shutdown,
438 .set_termios = meson_uart_set_termios,
439 .type = meson_uart_type,
440 .config_port = meson_uart_config_port,
441 .request_port = meson_uart_request_port,
442 .release_port = meson_uart_release_port,
443 .verify_port = meson_uart_verify_port,
444 };
445
446 #ifdef CONFIG_SERIAL_MESON_CONSOLE
447 static void meson_uart_enable_tx_engine(struct uart_port *port)
448 {
449 u32 val;
450
451 val = readl(port->membase + AML_UART_CONTROL);
452 val |= AML_UART_TX_EN;
453 writel(val, port->membase + AML_UART_CONTROL);
454 }
455
456 static void meson_console_putchar(struct uart_port *port, int ch)
457 {
458 if (!port->membase)
459 return;
460
461 while (readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)
462 cpu_relax();
463 writel(ch, port->membase + AML_UART_WFIFO);
464 }
465
466 static void meson_serial_port_write(struct uart_port *port, const char *s,
467 u_int count)
468 {
469 unsigned long flags;
470 int locked;
471 u32 val, tmp;
472
473 local_irq_save(flags);
474 if (port->sysrq) {
475 locked = 0;
476 } else if (oops_in_progress) {
477 locked = spin_trylock(&port->lock);
478 } else {
479 spin_lock(&port->lock);
480 locked = 1;
481 }
482
483 val = readl(port->membase + AML_UART_CONTROL);
484 tmp = val & ~(AML_UART_TX_INT_EN | AML_UART_RX_INT_EN);
485 writel(tmp, port->membase + AML_UART_CONTROL);
486
487 uart_console_write(port, s, count, meson_console_putchar);
488 writel(val, port->membase + AML_UART_CONTROL);
489
490 if (locked)
491 spin_unlock(&port->lock);
492 local_irq_restore(flags);
493 }
494
495 static void meson_serial_console_write(struct console *co, const char *s,
496 u_int count)
497 {
498 struct uart_port *port;
499
500 port = meson_ports[co->index];
501 if (!port)
502 return;
503
504 meson_serial_port_write(port, s, count);
505 }
506
507 static int meson_serial_console_setup(struct console *co, char *options)
508 {
509 struct uart_port *port;
510 int baud = 115200;
511 int bits = 8;
512 int parity = 'n';
513 int flow = 'n';
514
515 if (co->index < 0 || co->index >= AML_UART_PORT_NUM)
516 return -EINVAL;
517
518 port = meson_ports[co->index];
519 if (!port || !port->membase)
520 return -ENODEV;
521
522 meson_uart_enable_tx_engine(port);
523
524 if (options)
525 uart_parse_options(options, &baud, &parity, &bits, &flow);
526
527 return uart_set_options(port, co, baud, parity, bits, flow);
528 }
529
530 static struct console meson_serial_console = {
531 .name = AML_UART_DEV_NAME,
532 .write = meson_serial_console_write,
533 .device = uart_console_device,
534 .setup = meson_serial_console_setup,
535 .flags = CON_PRINTBUFFER,
536 .index = -1,
537 .data = &meson_uart_driver,
538 };
539
540 static int __init meson_serial_console_init(void)
541 {
542 register_console(&meson_serial_console);
543 return 0;
544 }
545 console_initcall(meson_serial_console_init);
546
547 static void meson_serial_early_console_write(struct console *co,
548 const char *s,
549 u_int count)
550 {
551 struct earlycon_device *dev = co->data;
552
553 meson_serial_port_write(&dev->port, s, count);
554 }
555
556 static int __init
557 meson_serial_early_console_setup(struct earlycon_device *device, const char *opt)
558 {
559 if (!device->port.membase)
560 return -ENODEV;
561
562 meson_uart_enable_tx_engine(&device->port);
563 device->con->write = meson_serial_early_console_write;
564 return 0;
565 }
566 /* Legacy bindings, should be removed when no more used */
567 OF_EARLYCON_DECLARE(meson, "amlogic,meson-uart",
568 meson_serial_early_console_setup);
569 /* Stable bindings */
570 OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart",
571 meson_serial_early_console_setup);
572
573 #define MESON_SERIAL_CONSOLE (&meson_serial_console)
574 #else
575 #define MESON_SERIAL_CONSOLE NULL
576 #endif
577
578 static struct uart_driver meson_uart_driver = {
579 .owner = THIS_MODULE,
580 .driver_name = "meson_uart",
581 .dev_name = AML_UART_DEV_NAME,
582 .nr = AML_UART_PORT_NUM,
583 .cons = MESON_SERIAL_CONSOLE,
584 };
585
586 static inline struct clk *meson_uart_probe_clock(struct device *dev,
587 const char *id)
588 {
589 struct clk *clk = NULL;
590 int ret;
591
592 clk = devm_clk_get(dev, id);
593 if (IS_ERR(clk))
594 return clk;
595
596 ret = clk_prepare_enable(clk);
597 if (ret) {
598 dev_err(dev, "couldn't enable clk\n");
599 return ERR_PTR(ret);
600 }
601
602 devm_add_action_or_reset(dev,
603 (void(*)(void *))clk_disable_unprepare,
604 clk);
605
606 return clk;
607 }
608
609 /*
610 * This function gets clocks in the legacy non-stable DT bindings.
611 * This code will be remove once all the platforms switch to the
612 * new DT bindings.
613 */
614 static int meson_uart_probe_clocks_legacy(struct platform_device *pdev,
615 struct uart_port *port)
616 {
617 struct clk *clk = NULL;
618
619 clk = meson_uart_probe_clock(&pdev->dev, NULL);
620 if (IS_ERR(clk))
621 return PTR_ERR(clk);
622
623 port->uartclk = clk_get_rate(clk);
624
625 return 0;
626 }
627
628 static int meson_uart_probe_clocks(struct platform_device *pdev,
629 struct uart_port *port)
630 {
631 struct clk *clk_xtal = NULL;
632 struct clk *clk_pclk = NULL;
633 struct clk *clk_baud = NULL;
634
635 clk_pclk = meson_uart_probe_clock(&pdev->dev, "pclk");
636 if (IS_ERR(clk_pclk))
637 return PTR_ERR(clk_pclk);
638
639 clk_xtal = meson_uart_probe_clock(&pdev->dev, "xtal");
640 if (IS_ERR(clk_xtal))
641 return PTR_ERR(clk_xtal);
642
643 clk_baud = meson_uart_probe_clock(&pdev->dev, "baud");
644 if (IS_ERR(clk_baud))
645 return PTR_ERR(clk_baud);
646
647 port->uartclk = clk_get_rate(clk_baud);
648
649 return 0;
650 }
651
652 static int meson_uart_probe(struct platform_device *pdev)
653 {
654 struct resource *res_mem, *res_irq;
655 struct uart_port *port;
656 int ret = 0;
657
658 if (pdev->dev.of_node)
659 pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");
660
661 if (pdev->id < 0 || pdev->id >= AML_UART_PORT_NUM)
662 return -EINVAL;
663
664 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
665 if (!res_mem)
666 return -ENODEV;
667
668 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
669 if (!res_irq)
670 return -ENODEV;
671
672 if (meson_ports[pdev->id]) {
673 dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);
674 return -EBUSY;
675 }
676
677 port = devm_kzalloc(&pdev->dev, sizeof(struct uart_port), GFP_KERNEL);
678 if (!port)
679 return -ENOMEM;
680
681 /* Use legacy way until all platforms switch to new bindings */
682 if (of_device_is_compatible(pdev->dev.of_node, "amlogic,meson-uart"))
683 ret = meson_uart_probe_clocks_legacy(pdev, port);
684 else
685 ret = meson_uart_probe_clocks(pdev, port);
686
687 if (ret)
688 return ret;
689
690 port->iotype = UPIO_MEM;
691 port->mapbase = res_mem->start;
692 port->mapsize = resource_size(res_mem);
693 port->irq = res_irq->start;
694 port->flags = UPF_BOOT_AUTOCONF | UPF_LOW_LATENCY;
695 port->dev = &pdev->dev;
696 port->line = pdev->id;
697 port->type = PORT_MESON;
698 port->x_char = 0;
699 port->ops = &meson_uart_ops;
700 port->fifosize = 64;
701
702 meson_ports[pdev->id] = port;
703 platform_set_drvdata(pdev, port);
704
705 /* reset port before registering (and possibly registering console) */
706 if (meson_uart_request_port(port) >= 0) {
707 meson_uart_reset(port);
708 meson_uart_release_port(port);
709 }
710
711 ret = uart_add_one_port(&meson_uart_driver, port);
712 if (ret)
713 meson_ports[pdev->id] = NULL;
714
715 return ret;
716 }
717
718 static int meson_uart_remove(struct platform_device *pdev)
719 {
720 struct uart_port *port;
721
722 port = platform_get_drvdata(pdev);
723 uart_remove_one_port(&meson_uart_driver, port);
724 meson_ports[pdev->id] = NULL;
725
726 return 0;
727 }
728
729 static const struct of_device_id meson_uart_dt_match[] = {
730 /* Legacy bindings, should be removed when no more used */
731 { .compatible = "amlogic,meson-uart" },
732 /* Stable bindings */
733 { .compatible = "amlogic,meson6-uart" },
734 { .compatible = "amlogic,meson8-uart" },
735 { .compatible = "amlogic,meson8b-uart" },
736 { .compatible = "amlogic,meson-gx-uart" },
737 { /* sentinel */ },
738 };
739 MODULE_DEVICE_TABLE(of, meson_uart_dt_match);
740
741 static struct platform_driver meson_uart_platform_driver = {
742 .probe = meson_uart_probe,
743 .remove = meson_uart_remove,
744 .driver = {
745 .name = "meson_uart",
746 .of_match_table = meson_uart_dt_match,
747 },
748 };
749
750 static int __init meson_uart_init(void)
751 {
752 int ret;
753
754 ret = uart_register_driver(&meson_uart_driver);
755 if (ret)
756 return ret;
757
758 ret = platform_driver_register(&meson_uart_platform_driver);
759 if (ret)
760 uart_unregister_driver(&meson_uart_driver);
761
762 return ret;
763 }
764
765 static void __exit meson_uart_exit(void)
766 {
767 platform_driver_unregister(&meson_uart_platform_driver);
768 uart_unregister_driver(&meson_uart_driver);
769 }
770
771 module_init(meson_uart_init);
772 module_exit(meson_uart_exit);
773
774 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
775 MODULE_DESCRIPTION("Amlogic Meson serial port driver");
776 MODULE_LICENSE("GPL v2");
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