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);