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_set_termios(struct uart_port *port,
 167                                     struct ktermios *termios,
 168                                     struct ktermios *old)
 169 {
 170         unsigned long flags;
 171         unsigned int baud, baudclk;
 172
 173         baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
 174         baudclk = port->uartclk / baud;
 175
 176         if (old)
 177                 tty_termios_copy_hw(termios, old);
 178         tty_termios_encode_baud_rate(termios, baud, baud);
 179
 180         spin_lock_irqsave(&port->lock, flags);
 181         uart_update_timeout(port, termios->c_cflag, baud);
 182         altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
 183         spin_unlock_irqrestore(&port->lock, flags);
 184
 185         /*
 186          * FIXME: port->read_status_mask and port->ignore_status_mask
 187          * need to be initialized based on termios settings for
 188          * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
 189          */
 190 }
 191
 192 static void altera_uart_rx_chars(struct altera_uart *pp)
 193 {
 194         struct uart_port *port = &pp->port;
 195         unsigned char ch, flag;
 196         unsigned short status;
 197
 198         while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) &
 199                ALTERA_UART_STATUS_RRDY_MSK) {
 200                 ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
 201                 flag = TTY_NORMAL;
 202                 port->icount.rx++;
 203
 204                 if (status & ALTERA_UART_STATUS_E_MSK) {
 205                         altera_uart_writel(port, status,
 206                                            ALTERA_UART_STATUS_REG);
 207
 208                         if (status & ALTERA_UART_STATUS_BRK_MSK) {
 209                                 port->icount.brk++;
 210                                 if (uart_handle_break(port))
 211                                         continue;
 212                         } else if (status & ALTERA_UART_STATUS_PE_MSK) {
 213                                 port->icount.parity++;
 214                         } else if (status & ALTERA_UART_STATUS_ROE_MSK) {
 215                                 port->icount.overrun++;
 216                         } else if (status & ALTERA_UART_STATUS_FE_MSK) {
 217                                 port->icount.frame++;
 218                         }
 219
 220                         status &= port->read_status_mask;
 221
 222                         if (status & ALTERA_UART_STATUS_BRK_MSK)
 223                                 flag = TTY_BREAK;
 224                         else if (status & ALTERA_UART_STATUS_PE_MSK)
 225                                 flag = TTY_PARITY;
 226                         else if (status & ALTERA_UART_STATUS_FE_MSK)
 227                                 flag = TTY_FRAME;
 228                 }
 229
 230                 if (uart_handle_sysrq_char(port, ch))
 231                         continue;
 232                 uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch,
 233                                  flag);
 234         }
 235
 236         spin_unlock(&port->lock);
 237         tty_flip_buffer_push(&port->state->port);
 238         spin_lock(&port->lock);
 239 }
 240
 241 static void altera_uart_tx_chars(struct altera_uart *pp)
 242 {
 243         struct uart_port *port = &pp->port;
 244         struct circ_buf *xmit = &port->state->xmit;
 245
 246         if (port->x_char) {
 247                 /* Send special char - probably flow control */
 248                 altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG);
 249                 port->x_char = 0;
 250                 port->icount.tx++;
 251                 return;
 252         }
 253
 254         while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 255                ALTERA_UART_STATUS_TRDY_MSK) {
 256                 if (xmit->head == xmit->tail)
 257                         break;
 258                 altera_uart_writel(port, xmit->buf[xmit->tail],
 259                        ALTERA_UART_TXDATA_REG);
 260                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 261                 port->icount.tx++;
 262         }
 263
 264         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 265                 uart_write_wakeup(port);
 266
 267         if (xmit->head == xmit->tail) {
 268                 pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
 269                 altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
 270         }
 271 }
 272
 273 static irqreturn_t altera_uart_interrupt(int irq, void *data)
 274 {
 275         struct uart_port *port = data;
 276         struct altera_uart *pp = container_of(port, struct altera_uart, port);
 277         unsigned int isr;
 278
 279         isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr;
 280
 281         spin_lock(&port->lock);
 282         if (isr & ALTERA_UART_STATUS_RRDY_MSK)
 283                 altera_uart_rx_chars(pp);
 284         if (isr & ALTERA_UART_STATUS_TRDY_MSK)
 285                 altera_uart_tx_chars(pp);
 286         spin_unlock(&port->lock);
 287
 288         return IRQ_RETVAL(isr);
 289 }
 290
 291 static void altera_uart_timer(unsigned long data)
 292 {
 293         struct uart_port *port = (void *)data;
 294         struct altera_uart *pp = container_of(port, struct altera_uart, port);
 295
 296         altera_uart_interrupt(0, port);
 297         mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
 298 }
 299
 300 static void altera_uart_config_port(struct uart_port *port, int flags)
 301 {
 302         port->type = PORT_ALTERA_UART;
 303
 304         /* Clear mask, so no surprise interrupts. */
 305         altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG);
 306         /* Clear status register */
 307         altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG);
 308 }
 309
 310 static int altera_uart_startup(struct uart_port *port)
 311 {
 312         struct altera_uart *pp = container_of(port, struct altera_uart, port);
 313         unsigned long flags;
 314         int ret;
 315
 316         if (!port->irq) {
 317                 setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port);
 318                 mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
 319                 return 0;
 320         }
 321
 322         ret = request_irq(port->irq, altera_uart_interrupt, 0,
 323                         DRV_NAME, port);
 324         if (ret) {
 325                 pr_err(DRV_NAME ": unable to attach Altera UART %d "
 326                        "interrupt vector=%d\n", port->line, port->irq);
 327                 return ret;
 328         }
 329
 330         spin_lock_irqsave(&port->lock, flags);
 331
 332         /* Enable RX interrupts now */
 333         pp->imr = ALTERA_UART_CONTROL_RRDY_MSK;
 334         writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
 335
 336         spin_unlock_irqrestore(&port->lock, flags);
 337
 338         return 0;
 339 }
 340
 341 static void altera_uart_shutdown(struct uart_port *port)
 342 {
 343         struct altera_uart *pp = container_of(port, struct altera_uart, port);
 344         unsigned long flags;
 345
 346         spin_lock_irqsave(&port->lock, flags);
 347
 348         /* Disable all interrupts now */
 349         pp->imr = 0;
 350         writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
 351
 352         spin_unlock_irqrestore(&port->lock, flags);
 353
 354         if (port->irq)
 355                 free_irq(port->irq, port);
 356         else
 357                 del_timer_sync(&pp->tmr);
 358 }
 359
 360 static const char *altera_uart_type(struct uart_port *port)
 361 {
 362         return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL;
 363 }
 364
 365 static int altera_uart_request_port(struct uart_port *port)
 366 {
 367         /* UARTs always present */
 368         return 0;
 369 }
 370
 371 static void altera_uart_release_port(struct uart_port *port)
 372 {
 373         /* Nothing to release... */
 374 }
 375
 376 static int altera_uart_verify_port(struct uart_port *port,
 377                                    struct serial_struct *ser)
 378 {
 379         if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART))
 380                 return -EINVAL;
 381         return 0;
 382 }
 383
 384 #ifdef CONFIG_CONSOLE_POLL
 385 static int altera_uart_poll_get_char(struct uart_port *port)
 386 {
 387         while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 388                  ALTERA_UART_STATUS_RRDY_MSK))
 389                 cpu_relax();
 390
 391         return altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
 392 }
 393
 394 static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
 395 {
 396         while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 397                  ALTERA_UART_STATUS_TRDY_MSK))
 398                 cpu_relax();
 399
 400         altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
 401 }
 402 #endif
 403
 404 /*
 405  *      Define the basic serial functions we support.
 406  */
 407 static const struct uart_ops altera_uart_ops = {
 408         .tx_empty       = altera_uart_tx_empty,
 409         .get_mctrl      = altera_uart_get_mctrl,
 410         .set_mctrl      = altera_uart_set_mctrl,
 411         .start_tx       = altera_uart_start_tx,
 412         .stop_tx        = altera_uart_stop_tx,
 413         .stop_rx        = altera_uart_stop_rx,
 414         .break_ctl      = altera_uart_break_ctl,
 415         .startup        = altera_uart_startup,
 416         .shutdown       = altera_uart_shutdown,
 417         .set_termios    = altera_uart_set_termios,
 418         .type           = altera_uart_type,
 419         .request_port   = altera_uart_request_port,
 420         .release_port   = altera_uart_release_port,
 421         .config_port    = altera_uart_config_port,
 422         .verify_port    = altera_uart_verify_port,
 423 #ifdef CONFIG_CONSOLE_POLL
 424         .poll_get_char  = altera_uart_poll_get_char,
 425         .poll_put_char  = altera_uart_poll_put_char,
 426 #endif
 427 };
 428
 429 static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
 430
 431 #if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
 432
 433 static void altera_uart_console_putc(struct uart_port *port, int c)
 434 {
 435         while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 436                  ALTERA_UART_STATUS_TRDY_MSK))
 437                 cpu_relax();
 438
 439         writel(c, port->membase + ALTERA_UART_TXDATA_REG);
 440 }
 441
 442 static void altera_uart_console_write(struct console *co, const char *s,
 443                                       unsigned int count)
 444 {
 445         struct uart_port *port = &(altera_uart_ports + co->index)->port;
 446
 447         uart_console_write(port, s, count, altera_uart_console_putc);
 448 }
 449
 450 static int __init altera_uart_console_setup(struct console *co, char *options)
 451 {
 452         struct uart_port *port;
 453         int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
 454         int bits = 8;
 455         int parity = 'n';
 456         int flow = 'n';
 457
 458         if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
 459                 return -EINVAL;
 460         port = &altera_uart_ports[co->index].port;
 461         if (!port->membase)
 462                 return -ENODEV;
 463
 464         if (options)
 465                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 466
 467         return uart_set_options(port, co, baud, parity, bits, flow);
 468 }
 469
 470 static struct uart_driver altera_uart_driver;
 471
 472 static struct console altera_uart_console = {
 473         .name   = "ttyAL",
 474         .write  = altera_uart_console_write,
 475         .device = uart_console_device,
 476         .setup  = altera_uart_console_setup,
 477         .flags  = CON_PRINTBUFFER,
 478         .index  = -1,
 479         .data   = &altera_uart_driver,
 480 };
 481
 482 static int __init altera_uart_console_init(void)
 483 {
 484         register_console(&altera_uart_console);
 485         return 0;
 486 }
 487
 488 console_initcall(altera_uart_console_init);
 489
 490 #define ALTERA_UART_CONSOLE     (&altera_uart_console)
 491
 492 static void altera_uart_earlycon_write(struct console *co, const char *s,
 493                                        unsigned int count)
 494 {
 495         struct earlycon_device *dev = co->data;
 496
 497         uart_console_write(&dev->port, s, count, altera_uart_console_putc);
 498 }
 499
 500 static int __init altera_uart_earlycon_setup(struct earlycon_device *dev,
 501                                              const char *options)
 502 {
 503         struct uart_port *port = &dev->port;
 504
 505         if (!port->membase)
 506                 return -ENODEV;
 507
 508         /* Enable RX interrupts now */
 509         writel(ALTERA_UART_CONTROL_RRDY_MSK,
 510                port->membase + ALTERA_UART_CONTROL_REG);
 511
 512         if (dev->baud) {
 513                 unsigned int baudclk = port->uartclk / dev->baud;
 514
 515                 writel(baudclk, port->membase + ALTERA_UART_DIVISOR_REG);
 516         }
 517
 518         dev->con->write = altera_uart_earlycon_write;
 519         return 0;
 520 }
 521
 522 OF_EARLYCON_DECLARE(uart, "altr,uart-1.0", altera_uart_earlycon_setup);
 523
 524 #else
 525
 526 #define ALTERA_UART_CONSOLE     NULL
 527
 528 #endif /* CONFIG_SERIAL_ALTERA_UART_CONSOLE */
 529
 530 /*
 531  *      Define the altera_uart UART driver structure.
 532  */
 533 static struct uart_driver altera_uart_driver = {
 534         .owner          = THIS_MODULE,
 535         .driver_name    = DRV_NAME,
 536         .dev_name       = "ttyAL",
 537         .major          = SERIAL_ALTERA_MAJOR,
 538         .minor          = SERIAL_ALTERA_MINOR,
 539         .nr             = CONFIG_SERIAL_ALTERA_UART_MAXPORTS,
 540         .cons           = ALTERA_UART_CONSOLE,
 541 };
 542
 543 static int altera_uart_probe(struct platform_device *pdev)
 544 {
 545         struct altera_uart_platform_uart *platp = dev_get_platdata(&pdev->dev);
 546         struct uart_port *port;
 547         struct resource *res_mem;
 548         struct resource *res_irq;
 549         int i = pdev->id;
 550         int ret;
 551
 552         /* if id is -1 scan for a free id and use that one */
 553         if (i == -1) {
 554                 for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++)
 555                         if (altera_uart_ports[i].port.mapbase == 0)
 556                                 break;
 557         }
 558
 559         if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
 560                 return -EINVAL;
 561
 562         port = &altera_uart_ports[i].port;
 563
 564         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 565         if (res_mem)
 566                 port->mapbase = res_mem->start;
 567         else if (platp)
 568                 port->mapbase = platp->mapbase;
 569         else
 570                 return -EINVAL;
 571
 572         res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 573         if (res_irq)
 574                 port->irq = res_irq->start;
 575         else if (platp)
 576                 port->irq = platp->irq;
 577
 578         /* Check platform data first so we can override device node data */
 579         if (platp)
 580                 port->uartclk = platp->uartclk;
 581         else {
 582                 ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
 583                                            &port->uartclk);
 584                 if (ret)
 585                         return ret;
 586         }
 587
 588         port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
 589         if (!port->membase)
 590                 return -ENOMEM;
 591
 592         if (platp)
 593                 port->regshift = platp->bus_shift;
 594         else
 595                 port->regshift = 0;
 596
 597         port->line = i;
 598         port->type = PORT_ALTERA_UART;
 599         port->iotype = SERIAL_IO_MEM;
 600         port->ops = &altera_uart_ops;
 601         port->flags = UPF_BOOT_AUTOCONF;
 602         port->dev = &pdev->dev;
 603
 604         platform_set_drvdata(pdev, port);
 605
 606         uart_add_one_port(&altera_uart_driver, port);
 607
 608         return 0;
 609 }
 610
 611 static int altera_uart_remove(struct platform_device *pdev)
 612 {
 613         struct uart_port *port = platform_get_drvdata(pdev);
 614
 615         if (port) {
 616                 uart_remove_one_port(&altera_uart_driver, port);
 617                 port->mapbase = 0;
 618                 iounmap(port->membase);
 619         }
 620
 621         return 0;
 622 }
 623
 624 #ifdef CONFIG_OF
 625 static const struct of_device_id altera_uart_match[] = {
 626         { .compatible = "ALTR,uart-1.0", },
 627         { .compatible = "altr,uart-1.0", },
 628         {},
 629 };
 630 MODULE_DEVICE_TABLE(of, altera_uart_match);
 631 #endif /* CONFIG_OF */
 632
 633 static struct platform_driver altera_uart_platform_driver = {
 634         .probe  = altera_uart_probe,
 635         .remove = altera_uart_remove,
 636         .driver = {
 637                 .name           = DRV_NAME,
 638                 .of_match_table = of_match_ptr(altera_uart_match),
 639         },
 640 };
 641
 642 static int __init altera_uart_init(void)
 643 {
 644         int rc;
 645
 646         rc = uart_register_driver(&altera_uart_driver);
 647         if (rc)
 648                 return rc;
 649         rc = platform_driver_register(&altera_uart_platform_driver);
 650         if (rc)
 651                 uart_unregister_driver(&altera_uart_driver);
 652         return rc;
 653 }
 654
 655 static void __exit altera_uart_exit(void)
 656 {
 657         platform_driver_unregister(&altera_uart_platform_driver);
 658         uart_unregister_driver(&altera_uart_driver);
 659 }
 660
 661 module_init(altera_uart_init);
 662 module_exit(altera_uart_exit);
 663
 664 MODULE_DESCRIPTION("Altera UART driver");
 665 MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
 666 MODULE_LICENSE("GPL");
 667 MODULE_ALIAS("platform:" DRV_NAME);
 668 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_ALTERA_MAJOR);