?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
staging: erofs: integrate decompression inplace
[linux/fpc-iii.git] / drivers / tty / serial / meson_uart.c
blobfbc5bc022a39281b5ca0b09e2085d8f4848b652a
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 12
76 #define AML_UART_PORT_OFFSET 6
77 #define AML_UART_DEV_NAME "ttyAML"
78
79
80 static struct uart_driver meson_uart_driver;
81
82 static struct uart_port *meson_ports[AML_UART_PORT_NUM];
83
84 static void meson_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
85 {
86 }
87
88 static unsigned int meson_uart_get_mctrl(struct uart_port *port)
89 {
90 return TIOCM_CTS;
91 }
92
93 static unsigned int meson_uart_tx_empty(struct uart_port *port)
94 {
95 u32 val;
96
97 val = readl(port->membase + AML_UART_STATUS);
98 val &= (AML_UART_TX_EMPTY | AML_UART_XMIT_BUSY);
99 return (val == AML_UART_TX_EMPTY) ? TIOCSER_TEMT : 0;
100 }
101
102 static void meson_uart_stop_tx(struct uart_port *port)
103 {
104 u32 val;
105
106 val = readl(port->membase + AML_UART_CONTROL);
107 val &= ~AML_UART_TX_INT_EN;
108 writel(val, port->membase + AML_UART_CONTROL);
109 }
110
111 static void meson_uart_stop_rx(struct uart_port *port)
112 {
113 u32 val;
114
115 val = readl(port->membase + AML_UART_CONTROL);
116 val &= ~AML_UART_RX_EN;
117 writel(val, port->membase + AML_UART_CONTROL);
118 }
119
120 static void meson_uart_shutdown(struct uart_port *port)
121 {
122 unsigned long flags;
123 u32 val;
124
125 free_irq(port->irq, port);
126
127 spin_lock_irqsave(&port->lock, flags);
128
129 val = readl(port->membase + AML_UART_CONTROL);
130 val &= ~AML_UART_RX_EN;
131 val &= ~(AML_UART_RX_INT_EN | AML_UART_TX_INT_EN);
132 writel(val, port->membase + AML_UART_CONTROL);
133
134 spin_unlock_irqrestore(&port->lock, flags);
135 }
136
137 static void meson_uart_start_tx(struct uart_port *port)
138 {
139 struct circ_buf *xmit = &port->state->xmit;
140 unsigned int ch;
141 u32 val;
142
143 if (uart_tx_stopped(port)) {
144 meson_uart_stop_tx(port);
145 return;
146 }
147
148 while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)) {
149 if (port->x_char) {
150 writel(port->x_char, port->membase + AML_UART_WFIFO);
151 port->icount.tx++;
152 port->x_char = 0;
153 continue;
154 }
155
156 if (uart_circ_empty(xmit))
157 break;
158
159 ch = xmit->buf[xmit->tail];
160 writel(ch, port->membase + AML_UART_WFIFO);
161 xmit->tail = (xmit->tail+1) & (SERIAL_XMIT_SIZE - 1);
162 port->icount.tx++;
163 }
164
165 if (!uart_circ_empty(xmit)) {
166 val = readl(port->membase + AML_UART_CONTROL);
167 val |= AML_UART_TX_INT_EN;
168 writel(val, port->membase + AML_UART_CONTROL);
169 }
170
171 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
172 uart_write_wakeup(port);
173 }
174
175 static void meson_receive_chars(struct uart_port *port)
176 {
177 struct tty_port *tport = &port->state->port;
178 char flag;
179 u32 ostatus, status, ch, mode;
180
181 do {
182 flag = TTY_NORMAL;
183 port->icount.rx++;
184 ostatus = status = readl(port->membase + AML_UART_STATUS);
185
186 if (status & AML_UART_ERR) {
187 if (status & AML_UART_TX_FIFO_WERR)
188 port->icount.overrun++;
189 else if (status & AML_UART_FRAME_ERR)
190 port->icount.frame++;
191 else if (status & AML_UART_PARITY_ERR)
192 port->icount.frame++;
193
194 mode = readl(port->membase + AML_UART_CONTROL);
195 mode |= AML_UART_CLEAR_ERR;
196 writel(mode, port->membase + AML_UART_CONTROL);
197
198 /* It doesn't clear to 0 automatically */
199 mode &= ~AML_UART_CLEAR_ERR;
200 writel(mode, port->membase + AML_UART_CONTROL);
201
202 status &= port->read_status_mask;
203 if (status & AML_UART_FRAME_ERR)
204 flag = TTY_FRAME;
205 else if (status & AML_UART_PARITY_ERR)
206 flag = TTY_PARITY;
207 }
208
209 ch = readl(port->membase + AML_UART_RFIFO);
210 ch &= 0xff;
211
212 if ((ostatus & AML_UART_FRAME_ERR) && (ch == 0)) {
213 port->icount.brk++;
214 flag = TTY_BREAK;
215 if (uart_handle_break(port))
216 continue;
217 }
218
219 if (uart_handle_sysrq_char(port, ch))
220 continue;
221
222 if ((status & port->ignore_status_mask) == 0)
223 tty_insert_flip_char(tport, ch, flag);
224
225 if (status & AML_UART_TX_FIFO_WERR)
226 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
227
228 } while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY));
229
230 spin_unlock(&port->lock);
231 tty_flip_buffer_push(tport);
232 spin_lock(&port->lock);
233 }
234
235 static irqreturn_t meson_uart_interrupt(int irq, void *dev_id)
236 {
237 struct uart_port *port = (struct uart_port *)dev_id;
238
239 spin_lock(&port->lock);
240
241 if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY))
242 meson_receive_chars(port);
243
244 if (!(readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)) {
245 if (readl(port->membase + AML_UART_CONTROL) & AML_UART_TX_INT_EN)
246 meson_uart_start_tx(port);
247 }
248
249 spin_unlock(&port->lock);
250
251 return IRQ_HANDLED;
252 }
253
254 static const char *meson_uart_type(struct uart_port *port)
255 {
256 return (port->type == PORT_MESON) ? "meson_uart" : NULL;
257 }
258
259 static void meson_uart_reset(struct uart_port *port)
260 {
261 u32 val;
262
263 val = readl(port->membase + AML_UART_CONTROL);
264 val |= (AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLEAR_ERR);
265 writel(val, port->membase + AML_UART_CONTROL);
266
267 val &= ~(AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLEAR_ERR);
268 writel(val, port->membase + AML_UART_CONTROL);
269 }
270
271 static int meson_uart_startup(struct uart_port *port)
272 {
273 u32 val;
274 int ret = 0;
275
276 val = readl(port->membase + AML_UART_CONTROL);
277 val |= AML_UART_CLEAR_ERR;
278 writel(val, port->membase + AML_UART_CONTROL);
279 val &= ~AML_UART_CLEAR_ERR;
280 writel(val, port->membase + AML_UART_CONTROL);
281
282 val |= (AML_UART_RX_EN | AML_UART_TX_EN);
283 writel(val, port->membase + AML_UART_CONTROL);
284
285 val |= (AML_UART_RX_INT_EN | AML_UART_TX_INT_EN);
286 writel(val, port->membase + AML_UART_CONTROL);
287
288 val = (AML_UART_RECV_IRQ(1) | AML_UART_XMIT_IRQ(port->fifosize / 2));
289 writel(val, port->membase + AML_UART_MISC);
290
291 ret = request_irq(port->irq, meson_uart_interrupt, 0,
292 port->name, port);
293
294 return ret;
295 }
296
297 static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
298 {
299 u32 val;
300
301 while (!meson_uart_tx_empty(port))
302 cpu_relax();
303
304 if (port->uartclk == 24000000) {
305 val = ((port->uartclk / 3) / baud) - 1;
306 val |= AML_UART_BAUD_XTAL;
307 } else {
308 val = ((port->uartclk * 10 / (baud * 4) + 5) / 10) - 1;
309 }
310 val |= AML_UART_BAUD_USE;
311 writel(val, port->membase + AML_UART_REG5);
312 }
313
314 static void meson_uart_set_termios(struct uart_port *port,
315 struct ktermios *termios,
316 struct ktermios *old)
317 {
318 unsigned int cflags, iflags, baud;
319 unsigned long flags;
320 u32 val;
321
322 spin_lock_irqsave(&port->lock, flags);
323
324 cflags = termios->c_cflag;
325 iflags = termios->c_iflag;
326
327 val = readl(port->membase + AML_UART_CONTROL);
328
329 val &= ~AML_UART_DATA_LEN_MASK;
330 switch (cflags & CSIZE) {
331 case CS8:
332 val |= AML_UART_DATA_LEN_8BIT;
333 break;
334 case CS7:
335 val |= AML_UART_DATA_LEN_7BIT;
336 break;
337 case CS6:
338 val |= AML_UART_DATA_LEN_6BIT;
339 break;
340 case CS5:
341 val |= AML_UART_DATA_LEN_5BIT;
342 break;
343 }
344
345 if (cflags & PARENB)
346 val |= AML_UART_PARITY_EN;
347 else
348 val &= ~AML_UART_PARITY_EN;
349
350 if (cflags & PARODD)
351 val |= AML_UART_PARITY_TYPE;
352 else
353 val &= ~AML_UART_PARITY_TYPE;
354
355 val &= ~AML_UART_STOP_BIT_LEN_MASK;
356 if (cflags & CSTOPB)
357 val |= AML_UART_STOP_BIT_2SB;
358 else
359 val |= AML_UART_STOP_BIT_1SB;
360
361 if (cflags & CRTSCTS)
362 val &= ~AML_UART_TWO_WIRE_EN;
363 else
364 val |= AML_UART_TWO_WIRE_EN;
365
366 writel(val, port->membase + AML_UART_CONTROL);
367
368 baud = uart_get_baud_rate(port, termios, old, 50, 4000000);
369 meson_uart_change_speed(port, baud);
370
371 port->read_status_mask = AML_UART_TX_FIFO_WERR;
372 if (iflags & INPCK)
373 port->read_status_mask |= AML_UART_PARITY_ERR |
374 AML_UART_FRAME_ERR;
375
376 port->ignore_status_mask = 0;
377 if (iflags & IGNPAR)
378 port->ignore_status_mask |= AML_UART_PARITY_ERR |
379 AML_UART_FRAME_ERR;
380
381 uart_update_timeout(port, termios->c_cflag, baud);
382 spin_unlock_irqrestore(&port->lock, flags);
383 }
384
385 static int meson_uart_verify_port(struct uart_port *port,
386 struct serial_struct *ser)
387 {
388 int ret = 0;
389
390 if (port->type != PORT_MESON)
391 ret = -EINVAL;
392 if (port->irq != ser->irq)
393 ret = -EINVAL;
394 if (ser->baud_base < 9600)
395 ret = -EINVAL;
396 return ret;
397 }
398
399 static void meson_uart_release_port(struct uart_port *port)
400 {
401 devm_iounmap(port->dev, port->membase);
402 port->membase = NULL;
403 devm_release_mem_region(port->dev, port->mapbase, port->mapsize);
404 }
405
406 static int meson_uart_request_port(struct uart_port *port)
407 {
408 if (!devm_request_mem_region(port->dev, port->mapbase, port->mapsize,
409 dev_name(port->dev))) {
410 dev_err(port->dev, "Memory region busy\n");
411 return -EBUSY;
412 }
413
414 port->membase = devm_ioremap_nocache(port->dev, port->mapbase,
415 port->mapsize);
416 if (!port->membase)
417 return -ENOMEM;
418
419 return 0;
420 }
421
422 static void meson_uart_config_port(struct uart_port *port, int flags)
423 {
424 if (flags & UART_CONFIG_TYPE) {
425 port->type = PORT_MESON;
426 meson_uart_request_port(port);
427 }
428 }
429
430 static const struct uart_ops meson_uart_ops = {
431 .set_mctrl = meson_uart_set_mctrl,
432 .get_mctrl = meson_uart_get_mctrl,
433 .tx_empty = meson_uart_tx_empty,
434 .start_tx = meson_uart_start_tx,
435 .stop_tx = meson_uart_stop_tx,
436 .stop_rx = meson_uart_stop_rx,
437 .startup = meson_uart_startup,
438 .shutdown = meson_uart_shutdown,
439 .set_termios = meson_uart_set_termios,
440 .type = meson_uart_type,
441 .config_port = meson_uart_config_port,
442 .request_port = meson_uart_request_port,
443 .release_port = meson_uart_release_port,
444 .verify_port = meson_uart_verify_port,
445 };
446
447 #ifdef CONFIG_SERIAL_MESON_CONSOLE
448 static void meson_uart_enable_tx_engine(struct uart_port *port)
449 {
450 u32 val;
451
452 val = readl(port->membase + AML_UART_CONTROL);
453 val |= AML_UART_TX_EN;
454 writel(val, port->membase + AML_UART_CONTROL);
455 }
456
457 static void meson_console_putchar(struct uart_port *port, int ch)
458 {
459 if (!port->membase)
460 return;
461
462 while (readl(port->membase + AML_UART_STATUS) & AML_UART_TX_FULL)
463 cpu_relax();
464 writel(ch, port->membase + AML_UART_WFIFO);
465 }
466
467 static void meson_serial_port_write(struct uart_port *port, const char *s,
468 u_int count)
469 {
470 unsigned long flags;
471 int locked;
472 u32 val, tmp;
473
474 local_irq_save(flags);
475 if (port->sysrq) {
476 locked = 0;
477 } else if (oops_in_progress) {
478 locked = spin_trylock(&port->lock);
479 } else {
480 spin_lock(&port->lock);
481 locked = 1;
482 }
483
484 val = readl(port->membase + AML_UART_CONTROL);
485 tmp = val & ~(AML_UART_TX_INT_EN | AML_UART_RX_INT_EN);
486 writel(tmp, port->membase + AML_UART_CONTROL);
487
488 uart_console_write(port, s, count, meson_console_putchar);
489 writel(val, port->membase + AML_UART_CONTROL);
490
491 if (locked)
492 spin_unlock(&port->lock);
493 local_irq_restore(flags);
494 }
495
496 static void meson_serial_console_write(struct console *co, const char *s,
497 u_int count)
498 {
499 struct uart_port *port;
500
501 port = meson_ports[co->index];
502 if (!port)
503 return;
504
505 meson_serial_port_write(port, s, count);
506 }
507
508 static int meson_serial_console_setup(struct console *co, char *options)
509 {
510 struct uart_port *port;
511 int baud = 115200;
512 int bits = 8;
513 int parity = 'n';
514 int flow = 'n';
515
516 if (co->index < 0 || co->index >= AML_UART_PORT_NUM)
517 return -EINVAL;
518
519 port = meson_ports[co->index];
520 if (!port || !port->membase)
521 return -ENODEV;
522
523 meson_uart_enable_tx_engine(port);
524
525 if (options)
526 uart_parse_options(options, &baud, &parity, &bits, &flow);
527
528 return uart_set_options(port, co, baud, parity, bits, flow);
529 }
530
531 static struct console meson_serial_console = {
532 .name = AML_UART_DEV_NAME,
533 .write = meson_serial_console_write,
534 .device = uart_console_device,
535 .setup = meson_serial_console_setup,
536 .flags = CON_PRINTBUFFER,
537 .index = -1,
538 .data = &meson_uart_driver,
539 };
540
541 static int __init meson_serial_console_init(void)
542 {
543 register_console(&meson_serial_console);
544 return 0;
545 }
546 console_initcall(meson_serial_console_init);
547
548 static void meson_serial_early_console_write(struct console *co,
549 const char *s,
550 u_int count)
551 {
552 struct earlycon_device *dev = co->data;
553
554 meson_serial_port_write(&dev->port, s, count);
555 }
556
557 static int __init
558 meson_serial_early_console_setup(struct earlycon_device *device, const char *opt)
559 {
560 if (!device->port.membase)
561 return -ENODEV;
562
563 meson_uart_enable_tx_engine(&device->port);
564 device->con->write = meson_serial_early_console_write;
565 return 0;
566 }
567 /* Legacy bindings, should be removed when no more used */
568 OF_EARLYCON_DECLARE(meson, "amlogic,meson-uart",
569 meson_serial_early_console_setup);
570 /* Stable bindings */
571 OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart",
572 meson_serial_early_console_setup);
573
574 #define MESON_SERIAL_CONSOLE (&meson_serial_console)
575 #else
576 #define MESON_SERIAL_CONSOLE NULL
577 #endif
578
579 static struct uart_driver meson_uart_driver = {
580 .owner = THIS_MODULE,
581 .driver_name = "meson_uart",
582 .dev_name = AML_UART_DEV_NAME,
583 .nr = AML_UART_PORT_NUM,
584 .cons = MESON_SERIAL_CONSOLE,
585 };
586
587 static inline struct clk *meson_uart_probe_clock(struct device *dev,
588 const char *id)
589 {
590 struct clk *clk = NULL;
591 int ret;
592
593 clk = devm_clk_get(dev, id);
594 if (IS_ERR(clk))
595 return clk;
596
597 ret = clk_prepare_enable(clk);
598 if (ret) {
599 dev_err(dev, "couldn't enable clk\n");
600 return ERR_PTR(ret);
601 }
602
603 devm_add_action_or_reset(dev,
604 (void(*)(void *))clk_disable_unprepare,
605 clk);
606
607 return clk;
608 }
609
610 /*
611 * This function gets clocks in the legacy non-stable DT bindings.
612 * This code will be remove once all the platforms switch to the
613 * new DT bindings.
614 */
615 static int meson_uart_probe_clocks_legacy(struct platform_device *pdev,
616 struct uart_port *port)
617 {
618 struct clk *clk = NULL;
619
620 clk = meson_uart_probe_clock(&pdev->dev, NULL);
621 if (IS_ERR(clk))
622 return PTR_ERR(clk);
623
624 port->uartclk = clk_get_rate(clk);
625
626 return 0;
627 }
628
629 static int meson_uart_probe_clocks(struct platform_device *pdev,
630 struct uart_port *port)
631 {
632 struct clk *clk_xtal = NULL;
633 struct clk *clk_pclk = NULL;
634 struct clk *clk_baud = NULL;
635
636 clk_pclk = meson_uart_probe_clock(&pdev->dev, "pclk");
637 if (IS_ERR(clk_pclk))
638 return PTR_ERR(clk_pclk);
639
640 clk_xtal = meson_uart_probe_clock(&pdev->dev, "xtal");
641 if (IS_ERR(clk_xtal))
642 return PTR_ERR(clk_xtal);
643
644 clk_baud = meson_uart_probe_clock(&pdev->dev, "baud");
645 if (IS_ERR(clk_baud))
646 return PTR_ERR(clk_baud);
647
648 port->uartclk = clk_get_rate(clk_baud);
649
650 return 0;
651 }
652
653 static int meson_uart_probe(struct platform_device *pdev)
654 {
655 struct resource *res_mem, *res_irq;
656 struct uart_port *port;
657 int ret = 0;
658 int id = -1;
659
660 if (pdev->dev.of_node)
661 pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");
662
663 if (pdev->id < 0) {
664 for (id = AML_UART_PORT_OFFSET; id < AML_UART_PORT_NUM; id++) {
665 if (!meson_ports[id]) {
666 pdev->id = id;
667 break;
668 }
669 }
670 }
671
672 if (pdev->id < 0 || pdev->id >= AML_UART_PORT_NUM)
673 return -EINVAL;
674
675 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
676 if (!res_mem)
677 return -ENODEV;
678
679 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
680 if (!res_irq)
681 return -ENODEV;
682
683 if (meson_ports[pdev->id]) {
684 dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);
685 return -EBUSY;
686 }
687
688 port = devm_kzalloc(&pdev->dev, sizeof(struct uart_port), GFP_KERNEL);
689 if (!port)
690 return -ENOMEM;
691
692 /* Use legacy way until all platforms switch to new bindings */
693 if (of_device_is_compatible(pdev->dev.of_node, "amlogic,meson-uart"))
694 ret = meson_uart_probe_clocks_legacy(pdev, port);
695 else
696 ret = meson_uart_probe_clocks(pdev, port);
697
698 if (ret)
699 return ret;
700
701 port->iotype = UPIO_MEM;
702 port->mapbase = res_mem->start;
703 port->mapsize = resource_size(res_mem);
704 port->irq = res_irq->start;
705 port->flags = UPF_BOOT_AUTOCONF | UPF_LOW_LATENCY;
706 port->dev = &pdev->dev;
707 port->line = pdev->id;
708 port->type = PORT_MESON;
709 port->x_char = 0;
710 port->ops = &meson_uart_ops;
711 port->fifosize = 64;
712
713 meson_ports[pdev->id] = port;
714 platform_set_drvdata(pdev, port);
715
716 /* reset port before registering (and possibly registering console) */
717 if (meson_uart_request_port(port) >= 0) {
718 meson_uart_reset(port);
719 meson_uart_release_port(port);
720 }
721
722 ret = uart_add_one_port(&meson_uart_driver, port);
723 if (ret)
724 meson_ports[pdev->id] = NULL;
725
726 return ret;
727 }
728
729 static int meson_uart_remove(struct platform_device *pdev)
730 {
731 struct uart_port *port;
732
733 port = platform_get_drvdata(pdev);
734 uart_remove_one_port(&meson_uart_driver, port);
735 meson_ports[pdev->id] = NULL;
736
737 return 0;
738 }
739
740 static const struct of_device_id meson_uart_dt_match[] = {
741 /* Legacy bindings, should be removed when no more used */
742 { .compatible = "amlogic,meson-uart" },
743 /* Stable bindings */
744 { .compatible = "amlogic,meson6-uart" },
745 { .compatible = "amlogic,meson8-uart" },
746 { .compatible = "amlogic,meson8b-uart" },
747 { .compatible = "amlogic,meson-gx-uart" },
748 { /* sentinel */ },
749 };
750 MODULE_DEVICE_TABLE(of, meson_uart_dt_match);
751
752 static struct platform_driver meson_uart_platform_driver = {
753 .probe = meson_uart_probe,
754 .remove = meson_uart_remove,
755 .driver = {
756 .name = "meson_uart",
757 .of_match_table = meson_uart_dt_match,
758 },
759 };
760
761 static int __init meson_uart_init(void)
762 {
763 int ret;
764
765 ret = uart_register_driver(&meson_uart_driver);
766 if (ret)
767 return ret;
768
769 ret = platform_driver_register(&meson_uart_platform_driver);
770 if (ret)
771 uart_unregister_driver(&meson_uart_driver);
772
773 return ret;
774 }
775
776 static void __exit meson_uart_exit(void)
777 {
778 platform_driver_unregister(&meson_uart_platform_driver);
779 uart_unregister_driver(&meson_uart_driver);
780 }
781
782 module_init(meson_uart_init);
783 module_exit(meson_uart_exit);
784
785 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
786 MODULE_DESCRIPTION("Amlogic Meson serial port driver");
787 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support