Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/drivers/tty/serial/altera_uart.c

  1 /*
  2  * altera_uart.c -- Altera UART driver
  3  *
  4  * Based on mcf.c -- Freescale ColdFire UART driver
  5  *
  6  * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
  7  * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw>
  8  * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  */
 15 
 16 #include <linux/kernel.h>
 17 #include <linux/init.h>
 18 #include <linux/timer.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/module.h>
 21 #include <linux/console.h>
 22 #include <linux/tty.h>
 23 #include <linux/tty_flip.h>
 24 #include <linux/serial.h>
 25 #include <linux/serial_core.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/of.h>
 28 #include <linux/io.h>
 29 #include <linux/altera_uart.h>
 30 
 31 #define DRV_NAME "altera_uart"
 32 #define SERIAL_ALTERA_MAJOR 204
 33 #define SERIAL_ALTERA_MINOR 213
 34 
 35 /*
 36  * Altera UART register definitions according to the Nios UART datasheet:
 37  * http://www.altera.com/literature/ds/ds_nios_uart.pdf
 38  */
 39 
 40 #define ALTERA_UART_SIZE                32
 41 
 42 #define ALTERA_UART_RXDATA_REG          0
 43 #define ALTERA_UART_TXDATA_REG          4
 44 #define ALTERA_UART_STATUS_REG          8
 45 #define ALTERA_UART_CONTROL_REG         12
 46 #define ALTERA_UART_DIVISOR_REG         16
 47 #define ALTERA_UART_EOP_REG             20
 48 
 49 #define ALTERA_UART_STATUS_PE_MSK       0x0001  /* parity error */
 50 #define ALTERA_UART_STATUS_FE_MSK       0x0002  /* framing error */
 51 #define ALTERA_UART_STATUS_BRK_MSK      0x0004  /* break */
 52 #define ALTERA_UART_STATUS_ROE_MSK      0x0008  /* RX overrun error */
 53 #define ALTERA_UART_STATUS_TOE_MSK      0x0010  /* TX overrun error */
 54 #define ALTERA_UART_STATUS_TMT_MSK      0x0020  /* TX shift register state */
 55 #define ALTERA_UART_STATUS_TRDY_MSK     0x0040  /* TX ready */
 56 #define ALTERA_UART_STATUS_RRDY_MSK     0x0080  /* RX ready */
 57 #define ALTERA_UART_STATUS_E_MSK        0x0100  /* exception condition */
 58 #define ALTERA_UART_STATUS_DCTS_MSK     0x0400  /* CTS logic-level change */
 59 #define ALTERA_UART_STATUS_CTS_MSK      0x0800  /* CTS logic state */
 60 #define ALTERA_UART_STATUS_EOP_MSK      0x1000  /* EOP written/read */
 61 
 62                                                 /* Enable interrupt on... */
 63 #define ALTERA_UART_CONTROL_PE_MSK      0x0001  /* ...parity error */
 64 #define ALTERA_UART_CONTROL_FE_MSK      0x0002  /* ...framing error */
 65 #define ALTERA_UART_CONTROL_BRK_MSK     0x0004  /* ...break */
 66 #define ALTERA_UART_CONTROL_ROE_MSK     0x0008  /* ...RX overrun */
 67 #define ALTERA_UART_CONTROL_TOE_MSK     0x0010  /* ...TX overrun */
 68 #define ALTERA_UART_CONTROL_TMT_MSK     0x0020  /* ...TX shift register empty */
 69 #define ALTERA_UART_CONTROL_TRDY_MSK    0x0040  /* ...TX ready */
 70 #define ALTERA_UART_CONTROL_RRDY_MSK    0x0080  /* ...RX ready */
 71 #define ALTERA_UART_CONTROL_E_MSK       0x0100  /* ...exception*/
 72 
 73 #define ALTERA_UART_CONTROL_TRBK_MSK    0x0200  /* TX break */
 74 #define ALTERA_UART_CONTROL_DCTS_MSK    0x0400  /* Interrupt on CTS change */
 75 #define ALTERA_UART_CONTROL_RTS_MSK     0x0800  /* RTS signal */
 76 #define ALTERA_UART_CONTROL_EOP_MSK     0x1000  /* Interrupt on EOP */
 77 
 78 /*
 79  * Local per-uart structure.
 80  */
 81 struct altera_uart {
 82         struct uart_port port;
 83         struct timer_list tmr;
 84         unsigned int sigs;      /* Local copy of line sigs */
 85         unsigned short imr;     /* Local IMR mirror */
 86 };
 87 
 88 static u32 altera_uart_readl(struct uart_port *port, int reg)
 89 {
 90         return readl(port->membase + (reg << port->regshift));
 91 }
 92 
 93 static void altera_uart_writel(struct uart_port *port, u32 dat, int reg)
 94 {
 95         writel(dat, port->membase + (reg << port->regshift));
 96 }
 97 
 98 static unsigned int altera_uart_tx_empty(struct uart_port *port)
 99 {
100         return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
101                 ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0;
102 }
103 
104 static unsigned int altera_uart_get_mctrl(struct uart_port *port)
105 {
106         struct altera_uart *pp = container_of(port, struct altera_uart, port);
107         unsigned int sigs;
108 
109         sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
110              ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0;
111         sigs |= (pp->sigs & TIOCM_RTS);
112 
113         return sigs;
114 }
115 
116 static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs)
117 {
118         struct altera_uart *pp = container_of(port, struct altera_uart, port);
119 
120         pp->sigs = sigs;
121         if (sigs & TIOCM_RTS)
122                 pp->imr |= ALTERA_UART_CONTROL_RTS_MSK;
123         else
124                 pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK;
125         altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
126 }
127 
128 static void altera_uart_start_tx(struct uart_port *port)
129 {
130         struct altera_uart *pp = container_of(port, struct altera_uart, port);
131 
132         pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK;
133         altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
134 }
135 
136 static void altera_uart_stop_tx(struct uart_port *port)
137 {
138         struct altera_uart *pp = container_of(port, struct altera_uart, port);
139 
140         pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
141         altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
142 }
143 
144 static void altera_uart_stop_rx(struct uart_port *port)
145 {
146         struct altera_uart *pp = container_of(port, struct altera_uart, port);
147 
148         pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK;
149         altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
150 }
151 
152 static void altera_uart_break_ctl(struct uart_port *port, int break_state)
153 {
154         struct altera_uart *pp = container_of(port, struct altera_uart, port);
155         unsigned long flags;
156 
157         spin_lock_irqsave(&port->lock, flags);
158         if (break_state == -1)
159                 pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK;
160         else
161                 pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK;
162         altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
163         spin_unlock_irqrestore(&port->lock, flags);
164 }
165 
166 static void altera_uart_enable_ms(struct uart_port *port)
167 {
168 }
169 
170 static void altera_uart_set_termios(struct uart_port *port,
171                                     struct ktermios *termios,
172                                     struct ktermios *old)
173 {
174         unsigned long flags;
175         unsigned int baud, baudclk;
176 
177         baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
178         baudclk = port->uartclk / baud;
179 
180         if (old)
181                 tty_termios_copy_hw(termios, old);
182         tty_termios_encode_baud_rate(termios, baud, baud);
183 
184         spin_lock_irqsave(&port->lock, flags);
185         uart_update_timeout(port, termios->c_cflag, baud);
186         altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
187         spin_unlock_irqrestore(&port->lock, flags);
188 }
189 
190 static void altera_uart_rx_chars(struct altera_uart *pp)
191 {
192         struct uart_port *port = &pp->port;
193         unsigned char ch, flag;
194         unsigned short status;
195 
196         while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) &
197                ALTERA_UART_STATUS_RRDY_MSK) {
198                 ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
199                 flag = TTY_NORMAL;
200                 port->icount.rx++;
201 
202                 if (status & ALTERA_UART_STATUS_E_MSK) {
203                         altera_uart_writel(port, status,
204                                            ALTERA_UART_STATUS_REG);
205 
206                         if (status & ALTERA_UART_STATUS_BRK_MSK) {
207                                 port->icount.brk++;
208                                 if (uart_handle_break(port))
209                                         continue;
210                         } else if (status & ALTERA_UART_STATUS_PE_MSK) {
211                                 port->icount.parity++;
212                         } else if (status & ALTERA_UART_STATUS_ROE_MSK) {
213                                 port->icount.overrun++;
214                         } else if (status & ALTERA_UART_STATUS_FE_MSK) {
215                                 port->icount.frame++;
216                         }
217 
218                         status &= port->read_status_mask;
219 
220                         if (status & ALTERA_UART_STATUS_BRK_MSK)
221                                 flag = TTY_BREAK;
222                         else if (status & ALTERA_UART_STATUS_PE_MSK)
223                                 flag = TTY_PARITY;
224                         else if (status & ALTERA_UART_STATUS_FE_MSK)
225                                 flag = TTY_FRAME;
226                 }
227 
228                 if (uart_handle_sysrq_char(port, ch))
229                         continue;
230                 uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch,
231                                  flag);
232         }
233 
234         spin_unlock(&port->lock);
235         tty_flip_buffer_push(&port->state->port);
236         spin_lock(&port->lock);
237 }
238 
239 static void altera_uart_tx_chars(struct altera_uart *pp)
240 {
241         struct uart_port *port = &pp->port;
242         struct circ_buf *xmit = &port->state->xmit;
243 
244         if (port->x_char) {
245                 /* Send special char - probably flow control */
246                 altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG);
247                 port->x_char = 0;
248                 port->icount.tx++;
249                 return;
250         }
251 
252         while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
253                ALTERA_UART_STATUS_TRDY_MSK) {
254                 if (xmit->head == xmit->tail)
255                         break;
256                 altera_uart_writel(port, xmit->buf[xmit->tail],
257                        ALTERA_UART_TXDATA_REG);
258                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
259                 port->icount.tx++;
260         }
261 
262         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
263                 uart_write_wakeup(port);
264 
265         if (xmit->head == xmit->tail) {
266                 pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
267                 altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
268         }
269 }
270 
271 static irqreturn_t altera_uart_interrupt(int irq, void *data)
272 {
273         struct uart_port *port = data;
274         struct altera_uart *pp = container_of(port, struct altera_uart, port);
275         unsigned int isr;
276 
277         isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr;
278 
279         spin_lock(&port->lock);
280         if (isr & ALTERA_UART_STATUS_RRDY_MSK)
281                 altera_uart_rx_chars(pp);
282         if (isr & ALTERA_UART_STATUS_TRDY_MSK)
283                 altera_uart_tx_chars(pp);
284         spin_unlock(&port->lock);
285 
286         return IRQ_RETVAL(isr);
287 }
288 
289 static void altera_uart_timer(unsigned long data)
290 {
291         struct uart_port *port = (void *)data;
292         struct altera_uart *pp = container_of(port, struct altera_uart, port);
293 
294         altera_uart_interrupt(0, port);
295         mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
296 }
297 
298 static void altera_uart_config_port(struct uart_port *port, int flags)
299 {
300         port->type = PORT_ALTERA_UART;
301 
302         /* Clear mask, so no surprise interrupts. */
303         altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG);
304         /* Clear status register */
305         altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG);
306 }
307 
308 static int altera_uart_startup(struct uart_port *port)
309 {
310         struct altera_uart *pp = container_of(port, struct altera_uart, port);
311         unsigned long flags;
312         int ret;
313 
314         if (!port->irq) {
315                 setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port);
316                 mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
317                 return 0;
318         }
319 
320         ret = request_irq(port->irq, altera_uart_interrupt, 0,
321                         DRV_NAME, port);
322         if (ret) {
323                 pr_err(DRV_NAME ": unable to attach Altera UART %d "
324                        "interrupt vector=%d\n", port->line, port->irq);
325                 return ret;
326         }
327 
328         spin_lock_irqsave(&port->lock, flags);
329 
330         /* Enable RX interrupts now */
331         pp->imr = ALTERA_UART_CONTROL_RRDY_MSK;
332         writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
333 
334         spin_unlock_irqrestore(&port->lock, flags);
335 
336         return 0;
337 }
338 
339 static void altera_uart_shutdown(struct uart_port *port)
340 {
341         struct altera_uart *pp = container_of(port, struct altera_uart, port);
342         unsigned long flags;
343 
344         spin_lock_irqsave(&port->lock, flags);
345 
346         /* Disable all interrupts now */
347         pp->imr = 0;
348         writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
349 
350         spin_unlock_irqrestore(&port->lock, flags);
351 
352         if (port->irq)
353                 free_irq(port->irq, port);
354         else
355                 del_timer_sync(&pp->tmr);
356 }
357 
358 static const char *altera_uart_type(struct uart_port *port)
359 {
360         return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL;
361 }
362 
363 static int altera_uart_request_port(struct uart_port *port)
364 {
365         /* UARTs always present */
366         return 0;
367 }
368 
369 static void altera_uart_release_port(struct uart_port *port)
370 {
371         /* Nothing to release... */
372 }
373 
374 static int altera_uart_verify_port(struct uart_port *port,
375                                    struct serial_struct *ser)
376 {
377         if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART))
378                 return -EINVAL;
379         return 0;
380 }
381 
382 #ifdef CONFIG_CONSOLE_POLL
383 static int altera_uart_poll_get_char(struct uart_port *port)
384 {
385         while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
386                  ALTERA_UART_STATUS_RRDY_MSK))
387                 cpu_relax();
388 
389         return altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
390 }
391 
392 static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
393 {
394         while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
395                  ALTERA_UART_STATUS_TRDY_MSK))
396                 cpu_relax();
397 
398         altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
399 }
400 #endif
401 
402 /*
403  *      Define the basic serial functions we support.
404  */
405 static struct uart_ops altera_uart_ops = {
406         .tx_empty       = altera_uart_tx_empty,
407         .get_mctrl      = altera_uart_get_mctrl,
408         .set_mctrl      = altera_uart_set_mctrl,
409         .start_tx       = altera_uart_start_tx,
410         .stop_tx        = altera_uart_stop_tx,
411         .stop_rx        = altera_uart_stop_rx,
412         .enable_ms      = altera_uart_enable_ms,
413         .break_ctl      = altera_uart_break_ctl,
414         .startup        = altera_uart_startup,
415         .shutdown       = altera_uart_shutdown,
416         .set_termios    = altera_uart_set_termios,
417         .type           = altera_uart_type,
418         .request_port   = altera_uart_request_port,
419         .release_port   = altera_uart_release_port,
420         .config_port    = altera_uart_config_port,
421         .verify_port    = altera_uart_verify_port,
422 #ifdef CONFIG_CONSOLE_POLL
423         .poll_get_char  = altera_uart_poll_get_char,
424         .poll_put_char  = altera_uart_poll_put_char,
425 #endif
426 };
427 
428 static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
429 
430 #if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
431 
432 static void altera_uart_console_putc(struct uart_port *port, const char c)
433 {
434         while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
435                  ALTERA_UART_STATUS_TRDY_MSK))
436                 cpu_relax();
437 
438         writel(c, port->membase + ALTERA_UART_TXDATA_REG);
439 }
440 
441 static void altera_uart_console_write(struct console *co, const char *s,
442                                       unsigned int count)
443 {
444         struct uart_port *port = &(altera_uart_ports + co->index)->port;
445 
446         for (; count; count--, s++) {
447                 altera_uart_console_putc(port, *s);
448                 if (*s == '\n')
449                         altera_uart_console_putc(port, '\r');
450         }
451 }
452 
453 static int __init altera_uart_console_setup(struct console *co, char *options)
454 {
455         struct uart_port *port;
456         int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
457         int bits = 8;
458         int parity = 'n';
459         int flow = 'n';
460 
461         if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
462                 return -EINVAL;
463         port = &altera_uart_ports[co->index].port;
464         if (!port->membase)
465                 return -ENODEV;
466 
467         if (options)
468                 uart_parse_options(options, &baud, &parity, &bits, &flow);
469 
470         return uart_set_options(port, co, baud, parity, bits, flow);
471 }
472 
473 static struct uart_driver altera_uart_driver;
474 
475 static struct console altera_uart_console = {
476         .name   = "ttyAL",
477         .write  = altera_uart_console_write,
478         .device = uart_console_device,
479         .setup  = altera_uart_console_setup,
480         .flags  = CON_PRINTBUFFER,
481         .index  = -1,
482         .data   = &altera_uart_driver,
483 };
484 
485 static int __init altera_uart_console_init(void)
486 {
487         register_console(&altera_uart_console);
488         return 0;
489 }
490 
491 console_initcall(altera_uart_console_init);
492 
493 #define ALTERA_UART_CONSOLE     (&altera_uart_console)
494 
495 #else
496 
497 #define ALTERA_UART_CONSOLE     NULL
498 
499 #endif /* CONFIG_ALTERA_UART_CONSOLE */
500 
501 /*
502  *      Define the altera_uart UART driver structure.
503  */
504 static struct uart_driver altera_uart_driver = {
505         .owner          = THIS_MODULE,
506         .driver_name    = DRV_NAME,
507         .dev_name       = "ttyAL",
508         .major          = SERIAL_ALTERA_MAJOR,
509         .minor          = SERIAL_ALTERA_MINOR,
510         .nr             = CONFIG_SERIAL_ALTERA_UART_MAXPORTS,
511         .cons           = ALTERA_UART_CONSOLE,
512 };
513 
514 #ifdef CONFIG_OF
515 static int altera_uart_get_of_uartclk(struct platform_device *pdev,
516                                       struct uart_port *port)
517 {
518         int len;
519         const __be32 *clk;
520 
521         clk = of_get_property(pdev->dev.of_node, "clock-frequency", &len);
522         if (!clk || len < sizeof(__be32))
523                 return -ENODEV;
524 
525         port->uartclk = be32_to_cpup(clk);
526 
527         return 0;
528 }
529 #else
530 static int altera_uart_get_of_uartclk(struct platform_device *pdev,
531                                       struct uart_port *port)
532 {
533         return -ENODEV;
534 }
535 #endif /* CONFIG_OF */
536 
537 static int altera_uart_probe(struct platform_device *pdev)
538 {
539         struct altera_uart_platform_uart *platp = dev_get_platdata(&pdev->dev);
540         struct uart_port *port;
541         struct resource *res_mem;
542         struct resource *res_irq;
543         int i = pdev->id;
544         int ret;
545 
546         /* if id is -1 scan for a free id and use that one */
547         if (i == -1) {
548                 for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++)
549                         if (altera_uart_ports[i].port.mapbase == 0)
550                                 break;
551         }
552 
553         if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
554                 return -EINVAL;
555 
556         port = &altera_uart_ports[i].port;
557 
558         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
559         if (res_mem)
560                 port->mapbase = res_mem->start;
561         else if (platp)
562                 port->mapbase = platp->mapbase;
563         else
564                 return -EINVAL;
565 
566         res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
567         if (res_irq)
568                 port->irq = res_irq->start;
569         else if (platp)
570                 port->irq = platp->irq;
571 
572         /* Check platform data first so we can override device node data */
573         if (platp)
574                 port->uartclk = platp->uartclk;
575         else {
576                 ret = altera_uart_get_of_uartclk(pdev, port);
577                 if (ret)
578                         return ret;
579         }
580 
581         port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
582         if (!port->membase)
583                 return -ENOMEM;
584 
585         if (platp)
586                 port->regshift = platp->bus_shift;
587         else
588                 port->regshift = 0;
589 
590         port->line = i;
591         port->type = PORT_ALTERA_UART;
592         port->iotype = SERIAL_IO_MEM;
593         port->ops = &altera_uart_ops;
594         port->flags = UPF_BOOT_AUTOCONF;
595 
596         platform_set_drvdata(pdev, port);
597 
598         uart_add_one_port(&altera_uart_driver, port);
599 
600         return 0;
601 }
602 
603 static int altera_uart_remove(struct platform_device *pdev)
604 {
605         struct uart_port *port = platform_get_drvdata(pdev);
606 
607         if (port) {
608                 uart_remove_one_port(&altera_uart_driver, port);
609                 port->mapbase = 0;
610         }
611 
612         return 0;
613 }
614 
615 #ifdef CONFIG_OF
616 static struct of_device_id altera_uart_match[] = {
617         { .compatible = "ALTR,uart-1.0", },
618         { .compatible = "altr,uart-1.0", },
619         {},
620 };
621 MODULE_DEVICE_TABLE(of, altera_uart_match);
622 #endif /* CONFIG_OF */
623 
624 static struct platform_driver altera_uart_platform_driver = {
625         .probe  = altera_uart_probe,
626         .remove = altera_uart_remove,
627         .driver = {
628                 .name           = DRV_NAME,
629                 .owner          = THIS_MODULE,
630                 .of_match_table = of_match_ptr(altera_uart_match),
631         },
632 };
633 
634 static int __init altera_uart_init(void)
635 {
636         int rc;
637 
638         rc = uart_register_driver(&altera_uart_driver);
639         if (rc)
640                 return rc;
641         rc = platform_driver_register(&altera_uart_platform_driver);
642         if (rc)
643                 uart_unregister_driver(&altera_uart_driver);
644         return rc;
645 }
646 
647 static void __exit altera_uart_exit(void)
648 {
649         platform_driver_unregister(&altera_uart_platform_driver);
650         uart_unregister_driver(&altera_uart_driver);
651 }
652 
653 module_init(altera_uart_init);
654 module_exit(altera_uart_exit);
655 
656 MODULE_DESCRIPTION("Altera UART driver");
657 MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
658 MODULE_LICENSE("GPL");
659 MODULE_ALIAS("platform:" DRV_NAME);
660 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_ALTERA_MAJOR);
661 

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