1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * altera_uart.c -- Altera UART driver
4 *
5 * Based on mcf.c -- Freescale ColdFire UART driver
6 *
7 * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
8 * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw>
9 * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/timer.h>
15 #include <linux/interrupt.h>
16 #include <linux/module.h>
17 #include <linux/console.h>
18 #include <linux/tty.h>
19 #include <linux/tty_flip.h>
20 #include <linux/serial.h>
21 #include <linux/serial_core.h>
22 #include <linux/platform_device.h>
23 #include <linux/of.h>
24 #include <linux/io.h>
25 #include <linux/altera_uart.h>
26
27 #define DRV_NAME "altera_uart"
28 #define SERIAL_ALTERA_MAJOR 204
29 #define SERIAL_ALTERA_MINOR 213
30
31 /*
32 * Altera UART register definitions according to the Nios UART datasheet:
33 * http://www.altera.com/literature/ds/ds_nios_uart.pdf
34 */
35
36 #define ALTERA_UART_SIZE 32
37
38 #define ALTERA_UART_RXDATA_REG 0
39 #define ALTERA_UART_TXDATA_REG 4
40 #define ALTERA_UART_STATUS_REG 8
41 #define ALTERA_UART_CONTROL_REG 12
42 #define ALTERA_UART_DIVISOR_REG 16
43 #define ALTERA_UART_EOP_REG 20
44
45 #define ALTERA_UART_STATUS_PE_MSK 0x0001 /* parity error */
46 #define ALTERA_UART_STATUS_FE_MSK 0x0002 /* framing error */
47 #define ALTERA_UART_STATUS_BRK_MSK 0x0004 /* break */
48 #define ALTERA_UART_STATUS_ROE_MSK 0x0008 /* RX overrun error */
49 #define ALTERA_UART_STATUS_TOE_MSK 0x0010 /* TX overrun error */
50 #define ALTERA_UART_STATUS_TMT_MSK 0x0020 /* TX shift register state */
51 #define ALTERA_UART_STATUS_TRDY_MSK 0x0040 /* TX ready */
52 #define ALTERA_UART_STATUS_RRDY_MSK 0x0080 /* RX ready */
53 #define ALTERA_UART_STATUS_E_MSK 0x0100 /* exception condition */
54 #define ALTERA_UART_STATUS_DCTS_MSK 0x0400 /* CTS logic-level change */
55 #define ALTERA_UART_STATUS_CTS_MSK 0x0800 /* CTS logic state */
56 #define ALTERA_UART_STATUS_EOP_MSK 0x1000 /* EOP written/read */
57
58 /* Enable interrupt on... */
59 #define ALTERA_UART_CONTROL_PE_MSK 0x0001 /* ...parity error */
60 #define ALTERA_UART_CONTROL_FE_MSK 0x0002 /* ...framing error */
61 #define ALTERA_UART_CONTROL_BRK_MSK 0x0004 /* ...break */
62 #define ALTERA_UART_CONTROL_ROE_MSK 0x0008 /* ...RX overrun */
63 #define ALTERA_UART_CONTROL_TOE_MSK 0x0010 /* ...TX overrun */
64 #define ALTERA_UART_CONTROL_TMT_MSK 0x0020 /* ...TX shift register empty */
65 #define ALTERA_UART_CONTROL_TRDY_MSK 0x0040 /* ...TX ready */
66 #define ALTERA_UART_CONTROL_RRDY_MSK 0x0080 /* ...RX ready */
67 #define ALTERA_UART_CONTROL_E_MSK 0x0100 /* ...exception*/
68
69 #define ALTERA_UART_CONTROL_TRBK_MSK 0x0200 /* TX break */
70 #define ALTERA_UART_CONTROL_DCTS_MSK 0x0400 /* Interrupt on CTS change */
71 #define ALTERA_UART_CONTROL_RTS_MSK 0x0800 /* RTS signal */
72 #define ALTERA_UART_CONTROL_EOP_MSK 0x1000 /* Interrupt on EOP */
73
74 /*
75 * Local per-uart structure.
76 */
77 struct altera_uart {
78 struct uart_port port;
79 struct timer_list tmr;
80 unsigned int sigs; /* Local copy of line sigs */
81 unsigned short imr; /* Local IMR mirror */
82 };
83
altera_uart_readl(struct uart_port * port,int reg)84 static u32 altera_uart_readl(struct uart_port *port, int reg)
85 {
86 return readl(port->membase + (reg << port->regshift));
87 }
88
altera_uart_writel(struct uart_port * port,u32 dat,int reg)89 static void altera_uart_writel(struct uart_port *port, u32 dat, int reg)
90 {
91 writel(dat, port->membase + (reg << port->regshift));
92 }
93
altera_uart_tx_empty(struct uart_port * port)94 static unsigned int altera_uart_tx_empty(struct uart_port *port)
95 {
96 return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
97 ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0;
98 }
99
altera_uart_get_mctrl(struct uart_port * port)100 static unsigned int altera_uart_get_mctrl(struct uart_port *port)
101 {
102 struct altera_uart *pp = container_of(port, struct altera_uart, port);
103 unsigned int sigs;
104
105 sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
106 ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0;
107 sigs |= (pp->sigs & TIOCM_RTS);
108
109 return sigs;
110 }
111
altera_uart_update_ctrl_reg(struct altera_uart * pp)112 static void altera_uart_update_ctrl_reg(struct altera_uart *pp)
113 {
114 unsigned short imr = pp->imr;
115
116 /*
117 * If the device doesn't have an irq, ensure that the irq bits are
118 * masked out to keep the irq line inactive.
119 */
120 if (!pp->port.irq)
121 imr &= ALTERA_UART_CONTROL_TRBK_MSK | ALTERA_UART_CONTROL_RTS_MSK;
122
123 altera_uart_writel(&pp->port, imr, ALTERA_UART_CONTROL_REG);
124 }
125
altera_uart_set_mctrl(struct uart_port * port,unsigned int sigs)126 static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs)
127 {
128 struct altera_uart *pp = container_of(port, struct altera_uart, port);
129
130 pp->sigs = sigs;
131 if (sigs & TIOCM_RTS)
132 pp->imr |= ALTERA_UART_CONTROL_RTS_MSK;
133 else
134 pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK;
135 altera_uart_update_ctrl_reg(pp);
136 }
137
altera_uart_start_tx(struct uart_port * port)138 static void altera_uart_start_tx(struct uart_port *port)
139 {
140 struct altera_uart *pp = container_of(port, struct altera_uart, port);
141
142 pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK;
143 altera_uart_update_ctrl_reg(pp);
144 }
145
altera_uart_stop_tx(struct uart_port * port)146 static void altera_uart_stop_tx(struct uart_port *port)
147 {
148 struct altera_uart *pp = container_of(port, struct altera_uart, port);
149
150 pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
151 altera_uart_update_ctrl_reg(pp);
152 }
153
altera_uart_stop_rx(struct uart_port * port)154 static void altera_uart_stop_rx(struct uart_port *port)
155 {
156 struct altera_uart *pp = container_of(port, struct altera_uart, port);
157
158 pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK;
159 altera_uart_update_ctrl_reg(pp);
160 }
161
altera_uart_break_ctl(struct uart_port * port,int break_state)162 static void altera_uart_break_ctl(struct uart_port *port, int break_state)
163 {
164 struct altera_uart *pp = container_of(port, struct altera_uart, port);
165 unsigned long flags;
166
167 spin_lock_irqsave(&port->lock, flags);
168 if (break_state == -1)
169 pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK;
170 else
171 pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK;
172 altera_uart_update_ctrl_reg(pp);
173 spin_unlock_irqrestore(&port->lock, flags);
174 }
175
altera_uart_set_termios(struct uart_port * port,struct ktermios * termios,const struct ktermios * old)176 static void altera_uart_set_termios(struct uart_port *port,
177 struct ktermios *termios,
178 const struct ktermios *old)
179 {
180 unsigned long flags;
181 unsigned int baud, baudclk;
182
183 baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
184 baudclk = port->uartclk / baud;
185
186 if (old)
187 tty_termios_copy_hw(termios, old);
188 tty_termios_encode_baud_rate(termios, baud, baud);
189
190 spin_lock_irqsave(&port->lock, flags);
191 uart_update_timeout(port, termios->c_cflag, baud);
192 altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
193 spin_unlock_irqrestore(&port->lock, flags);
194
195 /*
196 * FIXME: port->read_status_mask and port->ignore_status_mask
197 * need to be initialized based on termios settings for
198 * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
199 */
200 }
201
altera_uart_rx_chars(struct uart_port * port)202 static void altera_uart_rx_chars(struct uart_port *port)
203 {
204 unsigned char ch, flag;
205 unsigned short status;
206
207 while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) &
208 ALTERA_UART_STATUS_RRDY_MSK) {
209 ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
210 flag = TTY_NORMAL;
211 port->icount.rx++;
212
213 if (status & ALTERA_UART_STATUS_E_MSK) {
214 altera_uart_writel(port, status,
215 ALTERA_UART_STATUS_REG);
216
217 if (status & ALTERA_UART_STATUS_BRK_MSK) {
218 port->icount.brk++;
219 if (uart_handle_break(port))
220 continue;
221 } else if (status & ALTERA_UART_STATUS_PE_MSK) {
222 port->icount.parity++;
223 } else if (status & ALTERA_UART_STATUS_ROE_MSK) {
224 port->icount.overrun++;
225 } else if (status & ALTERA_UART_STATUS_FE_MSK) {
226 port->icount.frame++;
227 }
228
229 status &= port->read_status_mask;
230
231 if (status & ALTERA_UART_STATUS_BRK_MSK)
232 flag = TTY_BREAK;
233 else if (status & ALTERA_UART_STATUS_PE_MSK)
234 flag = TTY_PARITY;
235 else if (status & ALTERA_UART_STATUS_FE_MSK)
236 flag = TTY_FRAME;
237 }
238
239 if (uart_handle_sysrq_char(port, ch))
240 continue;
241 uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch,
242 flag);
243 }
244
245 tty_flip_buffer_push(&port->state->port);
246 }
247
altera_uart_tx_chars(struct uart_port * port)248 static void altera_uart_tx_chars(struct uart_port *port)
249 {
250 struct circ_buf *xmit = &port->state->xmit;
251
252 if (port->x_char) {
253 /* Send special char - probably flow control */
254 altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG);
255 port->x_char = 0;
256 port->icount.tx++;
257 return;
258 }
259
260 while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
261 ALTERA_UART_STATUS_TRDY_MSK) {
262 if (xmit->head == xmit->tail)
263 break;
264 altera_uart_writel(port, xmit->buf[xmit->tail],
265 ALTERA_UART_TXDATA_REG);
266 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
267 port->icount.tx++;
268 }
269
270 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
271 uart_write_wakeup(port);
272
273 if (uart_circ_empty(xmit))
274 altera_uart_stop_tx(port);
275 }
276
altera_uart_interrupt(int irq,void * data)277 static irqreturn_t altera_uart_interrupt(int irq, void *data)
278 {
279 struct uart_port *port = data;
280 struct altera_uart *pp = container_of(port, struct altera_uart, port);
281 unsigned int isr;
282
283 isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr;
284
285 spin_lock(&port->lock);
286 if (isr & ALTERA_UART_STATUS_RRDY_MSK)
287 altera_uart_rx_chars(port);
288 if (isr & ALTERA_UART_STATUS_TRDY_MSK)
289 altera_uart_tx_chars(port);
290 spin_unlock(&port->lock);
291
292 return IRQ_RETVAL(isr);
293 }
294
altera_uart_timer(struct timer_list * t)295 static void altera_uart_timer(struct timer_list *t)
296 {
297 struct altera_uart *pp = from_timer(pp, t, tmr);
298 struct uart_port *port = &pp->port;
299
300 altera_uart_interrupt(0, port);
301 mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
302 }
303
altera_uart_config_port(struct uart_port * port,int flags)304 static void altera_uart_config_port(struct uart_port *port, int flags)
305 {
306 port->type = PORT_ALTERA_UART;
307
308 /* Clear mask, so no surprise interrupts. */
309 altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG);
310 /* Clear status register */
311 altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG);
312 }
313
altera_uart_startup(struct uart_port * port)314 static int altera_uart_startup(struct uart_port *port)
315 {
316 struct altera_uart *pp = container_of(port, struct altera_uart, port);
317 unsigned long flags;
318
319 if (!port->irq) {
320 timer_setup(&pp->tmr, altera_uart_timer, 0);
321 mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
322 } else {
323 int ret;
324
325 ret = request_irq(port->irq, altera_uart_interrupt, 0,
326 DRV_NAME, port);
327 if (ret) {
328 pr_err(DRV_NAME ": unable to attach Altera UART %d "
329 "interrupt vector=%d\n", port->line, port->irq);
330 return ret;
331 }
332 }
333
334 spin_lock_irqsave(&port->lock, flags);
335
336 /* Enable RX interrupts now */
337 pp->imr = ALTERA_UART_CONTROL_RRDY_MSK;
338 altera_uart_update_ctrl_reg(pp);
339
340 spin_unlock_irqrestore(&port->lock, flags);
341
342 return 0;
343 }
344
altera_uart_shutdown(struct uart_port * port)345 static void altera_uart_shutdown(struct uart_port *port)
346 {
347 struct altera_uart *pp = container_of(port, struct altera_uart, port);
348 unsigned long flags;
349
350 spin_lock_irqsave(&port->lock, flags);
351
352 /* Disable all interrupts now */
353 pp->imr = 0;
354 altera_uart_update_ctrl_reg(pp);
355
356 spin_unlock_irqrestore(&port->lock, flags);
357
358 if (port->irq)
359 free_irq(port->irq, port);
360 else
361 del_timer_sync(&pp->tmr);
362 }
363
altera_uart_type(struct uart_port * port)364 static const char *altera_uart_type(struct uart_port *port)
365 {
366 return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL;
367 }
368
altera_uart_request_port(struct uart_port * port)369 static int altera_uart_request_port(struct uart_port *port)
370 {
371 /* UARTs always present */
372 return 0;
373 }
374
altera_uart_release_port(struct uart_port * port)375 static void altera_uart_release_port(struct uart_port *port)
376 {
377 /* Nothing to release... */
378 }
379
altera_uart_verify_port(struct uart_port * port,struct serial_struct * ser)380 static int altera_uart_verify_port(struct uart_port *port,
381 struct serial_struct *ser)
382 {
383 if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART))
384 return -EINVAL;
385 return 0;
386 }
387
388 #ifdef CONFIG_CONSOLE_POLL
altera_uart_poll_get_char(struct uart_port * port)389 static int altera_uart_poll_get_char(struct uart_port *port)
390 {
391 while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
392 ALTERA_UART_STATUS_RRDY_MSK))
393 cpu_relax();
394
395 return altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
396 }
397
altera_uart_poll_put_char(struct uart_port * port,unsigned char c)398 static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
399 {
400 while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
401 ALTERA_UART_STATUS_TRDY_MSK))
402 cpu_relax();
403
404 altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
405 }
406 #endif
407
408 /*
409 * Define the basic serial functions we support.
410 */
411 static const struct uart_ops altera_uart_ops = {
412 .tx_empty = altera_uart_tx_empty,
413 .get_mctrl = altera_uart_get_mctrl,
414 .set_mctrl = altera_uart_set_mctrl,
415 .start_tx = altera_uart_start_tx,
416 .stop_tx = altera_uart_stop_tx,
417 .stop_rx = altera_uart_stop_rx,
418 .break_ctl = altera_uart_break_ctl,
419 .startup = altera_uart_startup,
420 .shutdown = altera_uart_shutdown,
421 .set_termios = altera_uart_set_termios,
422 .type = altera_uart_type,
423 .request_port = altera_uart_request_port,
424 .release_port = altera_uart_release_port,
425 .config_port = altera_uart_config_port,
426 .verify_port = altera_uart_verify_port,
427 #ifdef CONFIG_CONSOLE_POLL
428 .poll_get_char = altera_uart_poll_get_char,
429 .poll_put_char = altera_uart_poll_put_char,
430 #endif
431 };
432
433 static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
434
435 #if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
436
altera_uart_console_putc(struct uart_port * port,unsigned char c)437 static void altera_uart_console_putc(struct uart_port *port, unsigned char c)
438 {
439 while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
440 ALTERA_UART_STATUS_TRDY_MSK))
441 cpu_relax();
442
443 altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
444 }
445
altera_uart_console_write(struct console * co,const char * s,unsigned int count)446 static void altera_uart_console_write(struct console *co, const char *s,
447 unsigned int count)
448 {
449 struct uart_port *port = &(altera_uart_ports + co->index)->port;
450
451 uart_console_write(port, s, count, altera_uart_console_putc);
452 }
453
altera_uart_console_setup(struct console * co,char * options)454 static int __init altera_uart_console_setup(struct console *co, char *options)
455 {
456 struct uart_port *port;
457 int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
458 int bits = 8;
459 int parity = 'n';
460 int flow = 'n';
461
462 if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
463 return -EINVAL;
464 port = &altera_uart_ports[co->index].port;
465 if (!port->membase)
466 return -ENODEV;
467
468 if (options)
469 uart_parse_options(options, &baud, &parity, &bits, &flow);
470
471 return uart_set_options(port, co, baud, parity, bits, flow);
472 }
473
474 static struct uart_driver altera_uart_driver;
475
476 static struct console altera_uart_console = {
477 .name = "ttyAL",
478 .write = altera_uart_console_write,
479 .device = uart_console_device,
480 .setup = altera_uart_console_setup,
481 .flags = CON_PRINTBUFFER,
482 .index = -1,
483 .data = &altera_uart_driver,
484 };
485
altera_uart_console_init(void)486 static int __init altera_uart_console_init(void)
487 {
488 register_console(&altera_uart_console);
489 return 0;
490 }
491
492 console_initcall(altera_uart_console_init);
493
494 #define ALTERA_UART_CONSOLE (&altera_uart_console)
495
altera_uart_earlycon_write(struct console * co,const char * s,unsigned int count)496 static void altera_uart_earlycon_write(struct console *co, const char *s,
497 unsigned int count)
498 {
499 struct earlycon_device *dev = co->data;
500
501 uart_console_write(&dev->port, s, count, altera_uart_console_putc);
502 }
503
altera_uart_earlycon_setup(struct earlycon_device * dev,const char * options)504 static int __init altera_uart_earlycon_setup(struct earlycon_device *dev,
505 const char *options)
506 {
507 struct uart_port *port = &dev->port;
508
509 if (!port->membase)
510 return -ENODEV;
511
512 /* Enable RX interrupts now */
513 altera_uart_writel(port, ALTERA_UART_CONTROL_RRDY_MSK,
514 ALTERA_UART_CONTROL_REG);
515
516 if (dev->baud) {
517 unsigned int baudclk = port->uartclk / dev->baud;
518
519 altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
520 }
521
522 dev->con->write = altera_uart_earlycon_write;
523 return 0;
524 }
525
526 OF_EARLYCON_DECLARE(uart, "altr,uart-1.0", altera_uart_earlycon_setup);
527
528 #else
529
530 #define ALTERA_UART_CONSOLE NULL
531
532 #endif /* CONFIG_SERIAL_ALTERA_UART_CONSOLE */
533
534 /*
535 * Define the altera_uart UART driver structure.
536 */
537 static struct uart_driver altera_uart_driver = {
538 .owner = THIS_MODULE,
539 .driver_name = DRV_NAME,
540 .dev_name = "ttyAL",
541 .major = SERIAL_ALTERA_MAJOR,
542 .minor = SERIAL_ALTERA_MINOR,
543 .nr = CONFIG_SERIAL_ALTERA_UART_MAXPORTS,
544 .cons = ALTERA_UART_CONSOLE,
545 };
546
altera_uart_probe(struct platform_device * pdev)547 static int altera_uart_probe(struct platform_device *pdev)
548 {
549 struct altera_uart_platform_uart *platp = dev_get_platdata(&pdev->dev);
550 struct uart_port *port;
551 struct resource *res_mem;
552 int i = pdev->id;
553 int ret;
554
555 /* if id is -1 scan for a free id and use that one */
556 if (i == -1) {
557 for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++)
558 if (altera_uart_ports[i].port.mapbase == 0)
559 break;
560 }
561
562 if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
563 return -EINVAL;
564
565 port = &altera_uart_ports[i].port;
566
567 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
568 if (res_mem)
569 port->mapbase = res_mem->start;
570 else if (platp)
571 port->mapbase = platp->mapbase;
572 else
573 return -EINVAL;
574
575 ret = platform_get_irq_optional(pdev, 0);
576 if (ret < 0 && ret != -ENXIO)
577 return ret;
578 if (ret > 0)
579 port->irq = ret;
580 else if (platp)
581 port->irq = platp->irq;
582
583 /* Check platform data first so we can override device node data */
584 if (platp)
585 port->uartclk = platp->uartclk;
586 else {
587 ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
588 &port->uartclk);
589 if (ret)
590 return ret;
591 }
592
593 port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
594 if (!port->membase)
595 return -ENOMEM;
596
597 if (platp)
598 port->regshift = platp->bus_shift;
599 else
600 port->regshift = 0;
601
602 port->line = i;
603 port->type = PORT_ALTERA_UART;
604 port->iotype = SERIAL_IO_MEM;
605 port->ops = &altera_uart_ops;
606 port->flags = UPF_BOOT_AUTOCONF;
607 port->dev = &pdev->dev;
608
609 platform_set_drvdata(pdev, port);
610
611 uart_add_one_port(&altera_uart_driver, port);
612
613 return 0;
614 }
615
altera_uart_remove(struct platform_device * pdev)616 static int altera_uart_remove(struct platform_device *pdev)
617 {
618 struct uart_port *port = platform_get_drvdata(pdev);
619
620 if (port) {
621 uart_remove_one_port(&altera_uart_driver, port);
622 port->mapbase = 0;
623 iounmap(port->membase);
624 }
625
626 return 0;
627 }
628
629 #ifdef CONFIG_OF
630 static const struct of_device_id altera_uart_match[] = {
631 { .compatible = "ALTR,uart-1.0", },
632 { .compatible = "altr,uart-1.0", },
633 {},
634 };
635 MODULE_DEVICE_TABLE(of, altera_uart_match);
636 #endif /* CONFIG_OF */
637
638 static struct platform_driver altera_uart_platform_driver = {
639 .probe = altera_uart_probe,
640 .remove = altera_uart_remove,
641 .driver = {
642 .name = DRV_NAME,
643 .of_match_table = of_match_ptr(altera_uart_match),
644 },
645 };
646
altera_uart_init(void)647 static int __init altera_uart_init(void)
648 {
649 int rc;
650
651 rc = uart_register_driver(&altera_uart_driver);
652 if (rc)
653 return rc;
654 rc = platform_driver_register(&altera_uart_platform_driver);
655 if (rc)
656 uart_unregister_driver(&altera_uart_driver);
657 return rc;
658 }
659
altera_uart_exit(void)660 static void __exit altera_uart_exit(void)
661 {
662 platform_driver_unregister(&altera_uart_platform_driver);
663 uart_unregister_driver(&altera_uart_driver);
664 }
665
666 module_init(altera_uart_init);
667 module_exit(altera_uart_exit);
668
669 MODULE_DESCRIPTION("Altera UART driver");
670 MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
671 MODULE_LICENSE("GPL");
672 MODULE_ALIAS("platform:" DRV_NAME);
673 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_ALTERA_MAJOR);
674
