git.oblomov.eu Git - linux-2.6/blob - drivers/serial/bfin_5xx.c

   1 /*
   2  * Blackfin On-Chip Serial Driver
   3  *
   4  * Copyright 2006-2008 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  12 #define SUPPORT_SYSRQ
  13 #endif
  14
  15 #include <linux/module.h>
  16 #include <linux/ioport.h>
  17 #include <linux/init.h>
  18 #include <linux/console.h>
  19 #include <linux/sysrq.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/tty.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/serial_core.h>
  24
  25 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
  26         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
  27 #include <linux/kgdb.h>
  28 #include <asm/irq_regs.h>
  29 #endif
  30
  31 #include <asm/gpio.h>
  32 #include <mach/bfin_serial_5xx.h>
  33
  34 #ifdef CONFIG_SERIAL_BFIN_DMA
  35 #include <linux/dma-mapping.h>
  36 #include <asm/io.h>
  37 #include <asm/irq.h>
  38 #include <asm/cacheflush.h>
  39 #endif
  40
  41 /* UART name and device definitions */
  42 #define BFIN_SERIAL_NAME        "ttyBF"
  43 #define BFIN_SERIAL_MAJOR       204
  44 #define BFIN_SERIAL_MINOR       64
  45
  46 static struct bfin_serial_port bfin_serial_ports[BFIN_UART_NR_PORTS];
  47 static int nr_active_ports = ARRAY_SIZE(bfin_serial_resource);
  48
  49 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
  50         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
  51
  52 # ifndef CONFIG_SERIAL_BFIN_PIO
  53 #  error KGDB only support UART in PIO mode.
  54 # endif
  55
  56 static int kgdboc_port_line;
  57 static int kgdboc_break_enabled;
  58 #endif
  59 /*
  60  * Setup for console. Argument comes from the menuconfig
  61  */
  62 #define DMA_RX_XCOUNT           512
  63 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  64
  65 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
  66 #define CTS_CHECK_JIFFIES       (HZ / 50)
  67
  68 #ifdef CONFIG_SERIAL_BFIN_DMA
  69 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  70 #else
  71 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  72 #endif
  73
  74 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
  75
  76 static void bfin_serial_reset_irda(struct uart_port *port);
  77
  78 /*
  79  * interrupts are disabled on entry
  80  */
  81 static void bfin_serial_stop_tx(struct uart_port *port)
  82 {
  83         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  84 #ifdef CONFIG_SERIAL_BFIN_DMA
  85         struct circ_buf *xmit = &uart->port.info->xmit;
  86 #endif
  87
  88         while (!(UART_GET_LSR(uart) & TEMT))
  89                 cpu_relax();
  90
  91 #ifdef CONFIG_SERIAL_BFIN_DMA
  92         disable_dma(uart->tx_dma_channel);
  93         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
  94         uart->port.icount.tx += uart->tx_count;
  95         uart->tx_count = 0;
  96         uart->tx_done = 1;
  97 #else
  98 #ifdef CONFIG_BF54x
  99         /* Clear TFI bit */
 100         UART_PUT_LSR(uart, TFI);
 101 #endif
 102         UART_CLEAR_IER(uart, ETBEI);
 103 #endif
 104 }
 105
 106 /*
 107  * port is locked and interrupts are disabled
 108  */
 109 static void bfin_serial_start_tx(struct uart_port *port)
 110 {
 111         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 112         struct tty_struct *tty = uart->port.info->port.tty;
 113
 114         /*
 115          * To avoid losting RX interrupt, we reset IR function
 116          * before sending data.
 117          */
 118         if (tty->termios->c_line == N_IRDA)
 119                 bfin_serial_reset_irda(port);
 120
 121 #ifdef CONFIG_SERIAL_BFIN_DMA
 122         if (uart->tx_done)
 123                 bfin_serial_dma_tx_chars(uart);
 124 #else
 125         UART_SET_IER(uart, ETBEI);
 126         bfin_serial_tx_chars(uart);
 127 #endif
 128 }
 129
 130 /*
 131  * Interrupts are enabled
 132  */
 133 static void bfin_serial_stop_rx(struct uart_port *port)
 134 {
 135         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 136
 137         UART_CLEAR_IER(uart, ERBFI);
 138 }
 139
 140 /*
 141  * Set the modem control timer to fire immediately.
 142  */
 143 static void bfin_serial_enable_ms(struct uart_port *port)
 144 {
 145 }
 146
 147
 148 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
 149 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 150 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 151 #else
 152 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 153 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 154 #endif
 155
 156 #ifdef CONFIG_SERIAL_BFIN_PIO
 157 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 158 {
 159         struct tty_struct *tty = NULL;
 160         unsigned int status, ch, flg;
 161         static struct timeval anomaly_start = { .tv_sec = 0 };
 162
 163         status = UART_GET_LSR(uart);
 164         UART_CLEAR_LSR(uart);
 165
 166         ch = UART_GET_CHAR(uart);
 167         uart->port.icount.rx++;
 168
 169 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 170         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 171         if (kgdb_connected && kgdboc_port_line == uart->port.line)
 172                 if (ch == 0x3) {/* Ctrl + C */
 173                         kgdb_breakpoint();
 174                         return;
 175                 }
 176
 177         if (!uart->port.info || !uart->port.info->tty)
 178                 return;
 179 #endif
 180         tty = uart->port.info->tty;
 181
 182         if (ANOMALY_05000363) {
 183                 /* The BF533 (and BF561) family of processors have a nice anomaly
 184                  * where they continuously generate characters for a "single" break.
 185                  * We have to basically ignore this flood until the "next" valid
 186                  * character comes across.  Due to the nature of the flood, it is
 187                  * not possible to reliably catch bytes that are sent too quickly
 188                  * after this break.  So application code talking to the Blackfin
 189                  * which sends a break signal must allow at least 1.5 character
 190                  * times after the end of the break for things to stabilize.  This
 191                  * timeout was picked as it must absolutely be larger than 1
 192                  * character time +/- some percent.  So 1.5 sounds good.  All other
 193                  * Blackfin families operate properly.  Woo.
 194                  */
 195                 if (anomaly_start.tv_sec) {
 196                         struct timeval curr;
 197                         suseconds_t usecs;
 198
 199                         if ((~ch & (~ch + 1)) & 0xff)
 200                                 goto known_good_char;
 201
 202                         do_gettimeofday(&curr);
 203                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
 204                                 goto known_good_char;
 205
 206                         usecs = 0;
 207                         if (curr.tv_sec != anomaly_start.tv_sec)
 208                                 usecs += USEC_PER_SEC;
 209                         usecs += curr.tv_usec - anomaly_start.tv_usec;
 210
 211                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
 212                                 goto known_good_char;
 213
 214                         if (ch)
 215                                 anomaly_start.tv_sec = 0;
 216                         else
 217                                 anomaly_start = curr;
 218
 219                         return;
 220
 221  known_good_char:
 222                         anomaly_start.tv_sec = 0;
 223                 }
 224         }
 225
 226         if (status & BI) {
 227                 if (ANOMALY_05000363)
 228                         if (bfin_revid() < 5)
 229                                 do_gettimeofday(&anomaly_start);
 230                 uart->port.icount.brk++;
 231                 if (uart_handle_break(&uart->port))
 232                         goto ignore_char;
 233                 status &= ~(PE | FE);
 234         }
 235         if (status & PE)
 236                 uart->port.icount.parity++;
 237         if (status & OE)
 238                 uart->port.icount.overrun++;
 239         if (status & FE)
 240                 uart->port.icount.frame++;
 241
 242         status &= uart->port.read_status_mask;
 243
 244         if (status & BI)
 245                 flg = TTY_BREAK;
 246         else if (status & PE)
 247                 flg = TTY_PARITY;
 248         else if (status & FE)
 249                 flg = TTY_FRAME;
 250         else
 251                 flg = TTY_NORMAL;
 252
 253         if (uart_handle_sysrq_char(&uart->port, ch))
 254                 goto ignore_char;
 255
 256         uart_insert_char(&uart->port, status, OE, ch, flg);
 257
 258  ignore_char:
 259         tty_flip_buffer_push(tty);
 260 }
 261
 262 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 263 {
 264         struct circ_buf *xmit = &uart->port.info->xmit;
 265
 266         /*
 267          * Check the modem control lines before
 268          * transmitting anything.
 269          */
 270         bfin_serial_mctrl_check(uart);
 271
 272         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 273 #ifdef CONFIG_BF54x
 274                 /* Clear TFI bit */
 275                 UART_PUT_LSR(uart, TFI);
 276 #endif
 277                 UART_CLEAR_IER(uart, ETBEI);
 278                 return;
 279         }
 280
 281         if (uart->port.x_char) {
 282                 UART_PUT_CHAR(uart, uart->port.x_char);
 283                 uart->port.icount.tx++;
 284                 uart->port.x_char = 0;
 285         }
 286
 287         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 288                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 289                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 290                 uart->port.icount.tx++;
 291                 SSYNC();
 292         }
 293
 294         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 295                 uart_write_wakeup(&uart->port);
 296 }
 297
 298 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 299 {
 300         struct bfin_serial_port *uart = dev_id;
 301
 302         spin_lock(&uart->port.lock);
 303         while (UART_GET_LSR(uart) & DR)
 304                 bfin_serial_rx_chars(uart);
 305         spin_unlock(&uart->port.lock);
 306
 307         return IRQ_HANDLED;
 308 }
 309
 310 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 311 {
 312         struct bfin_serial_port *uart = dev_id;
 313
 314         spin_lock(&uart->port.lock);
 315         if (UART_GET_LSR(uart) & THRE)
 316                 bfin_serial_tx_chars(uart);
 317         spin_unlock(&uart->port.lock);
 318
 319         return IRQ_HANDLED;
 320 }
 321 #endif
 322
 323 #ifdef CONFIG_SERIAL_BFIN_DMA
 324 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 325 {
 326         struct circ_buf *xmit = &uart->port.info->xmit;
 327
 328         uart->tx_done = 0;
 329
 330         /*
 331          * Check the modem control lines before
 332          * transmitting anything.
 333          */
 334         bfin_serial_mctrl_check(uart);
 335
 336         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 337                 uart->tx_count = 0;
 338                 uart->tx_done = 1;
 339                 return;
 340         }
 341
 342         if (uart->port.x_char) {
 343                 UART_PUT_CHAR(uart, uart->port.x_char);
 344                 uart->port.icount.tx++;
 345                 uart->port.x_char = 0;
 346         }
 347
 348         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 349         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 350                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 351         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 352                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 353         set_dma_config(uart->tx_dma_channel,
 354                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 355                         INTR_ON_BUF,
 356                         DIMENSION_LINEAR,
 357                         DATA_SIZE_8,
 358                         DMA_SYNC_RESTART));
 359         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 360         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 361         set_dma_x_modify(uart->tx_dma_channel, 1);
 362         enable_dma(uart->tx_dma_channel);
 363
 364         UART_SET_IER(uart, ETBEI);
 365 }
 366
 367 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 368 {
 369         struct tty_struct *tty = uart->port.info->port.tty;
 370         int i, flg, status;
 371
 372         status = UART_GET_LSR(uart);
 373         UART_CLEAR_LSR(uart);
 374
 375         uart->port.icount.rx +=
 376                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 377                 UART_XMIT_SIZE);
 378
 379         if (status & BI) {
 380                 uart->port.icount.brk++;
 381                 if (uart_handle_break(&uart->port))
 382                         goto dma_ignore_char;
 383                 status &= ~(PE | FE);
 384         }
 385         if (status & PE)
 386                 uart->port.icount.parity++;
 387         if (status & OE)
 388                 uart->port.icount.overrun++;
 389         if (status & FE)
 390                 uart->port.icount.frame++;
 391
 392         status &= uart->port.read_status_mask;
 393
 394         if (status & BI)
 395                 flg = TTY_BREAK;
 396         else if (status & PE)
 397                 flg = TTY_PARITY;
 398         else if (status & FE)
 399                 flg = TTY_FRAME;
 400         else
 401                 flg = TTY_NORMAL;
 402
 403         for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
 404                 if (i >= UART_XMIT_SIZE)
 405                         i = 0;
 406                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 407                         uart_insert_char(&uart->port, status, OE,
 408                                 uart->rx_dma_buf.buf[i], flg);
 409         }
 410
 411  dma_ignore_char:
 412         tty_flip_buffer_push(tty);
 413 }
 414
 415 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 416 {
 417         int x_pos, pos, flags;
 418
 419         spin_lock_irqsave(&uart->port.lock, flags);
 420
 421         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 422         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 423         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 424         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
 425                 uart->rx_dma_nrows = 0;
 426         x_pos = DMA_RX_XCOUNT - x_pos;
 427         if (x_pos == DMA_RX_XCOUNT)
 428                 x_pos = 0;
 429
 430         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 431         if (pos != uart->rx_dma_buf.tail) {
 432                 uart->rx_dma_buf.head = pos;
 433                 bfin_serial_dma_rx_chars(uart);
 434                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 435         }
 436
 437         spin_unlock_irqrestore(&uart->port.lock, flags);
 438
 439         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 440 }
 441
 442 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 443 {
 444         struct bfin_serial_port *uart = dev_id;
 445         struct circ_buf *xmit = &uart->port.info->xmit;
 446
 447         spin_lock(&uart->port.lock);
 448         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 449                 disable_dma(uart->tx_dma_channel);
 450                 clear_dma_irqstat(uart->tx_dma_channel);
 451                 UART_CLEAR_IER(uart, ETBEI);
 452                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 453                 uart->port.icount.tx += uart->tx_count;
 454
 455                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 456                         uart_write_wakeup(&uart->port);
 457
 458                 bfin_serial_dma_tx_chars(uart);
 459         }
 460
 461         spin_unlock(&uart->port.lock);
 462         return IRQ_HANDLED;
 463 }
 464
 465 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 466 {
 467         struct bfin_serial_port *uart = dev_id;
 468         unsigned short irqstat;
 469
 470         spin_lock(&uart->port.lock);
 471         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 472         clear_dma_irqstat(uart->rx_dma_channel);
 473         bfin_serial_dma_rx_chars(uart);
 474         spin_unlock(&uart->port.lock);
 475
 476         return IRQ_HANDLED;
 477 }
 478 #endif
 479
 480 /*
 481  * Return TIOCSER_TEMT when transmitter is not busy.
 482  */
 483 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 484 {
 485         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 486         unsigned short lsr;
 487
 488         lsr = UART_GET_LSR(uart);
 489         if (lsr & TEMT)
 490                 return TIOCSER_TEMT;
 491         else
 492                 return 0;
 493 }
 494
 495 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 496 {
 497 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 498         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 499         if (uart->cts_pin < 0)
 500                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 501
 502         if (UART_GET_CTS(uart))
 503                 return TIOCM_DSR | TIOCM_CAR;
 504         else
 505 #endif
 506                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 507 }
 508
 509 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 510 {
 511 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 512         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 513         if (uart->rts_pin < 0)
 514                 return;
 515
 516         if (mctrl & TIOCM_RTS)
 517                 UART_CLEAR_RTS(uart);
 518         else
 519                 UART_SET_RTS(uart);
 520 #endif
 521 }
 522
 523 /*
 524  * Handle any change of modem status signal since we were last called.
 525  */
 526 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 527 {
 528 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 529         unsigned int status;
 530         struct uart_info *info = uart->port.info;
 531         struct tty_struct *tty = info->port.tty;
 532
 533         status = bfin_serial_get_mctrl(&uart->port);
 534         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 535         if (!(status & TIOCM_CTS)) {
 536                 tty->hw_stopped = 1;
 537                 uart->cts_timer.data = (unsigned long)(uart);
 538                 uart->cts_timer.function = (void *)bfin_serial_mctrl_check;
 539                 uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES;
 540                 add_timer(&(uart->cts_timer));
 541         } else {
 542                 tty->hw_stopped = 0;
 543         }
 544 #endif
 545 }
 546
 547 /*
 548  * Interrupts are always disabled.
 549  */
 550 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 551 {
 552         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 553         u16 lcr = UART_GET_LCR(uart);
 554         if (break_state)
 555                 lcr |= SB;
 556         else
 557                 lcr &= ~SB;
 558         UART_PUT_LCR(uart, lcr);
 559         SSYNC();
 560 }
 561
 562 static int bfin_serial_startup(struct uart_port *port)
 563 {
 564         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 565
 566 #ifdef CONFIG_SERIAL_BFIN_DMA
 567         dma_addr_t dma_handle;
 568
 569         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 570                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 571                 return -EBUSY;
 572         }
 573
 574         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 575                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 576                 free_dma(uart->rx_dma_channel);
 577                 return -EBUSY;
 578         }
 579
 580         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 581         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 582
 583         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 584         uart->rx_dma_buf.head = 0;
 585         uart->rx_dma_buf.tail = 0;
 586         uart->rx_dma_nrows = 0;
 587
 588         set_dma_config(uart->rx_dma_channel,
 589                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 590                                 INTR_ON_ROW, DIMENSION_2D,
 591                                 DATA_SIZE_8,
 592                                 DMA_SYNC_RESTART));
 593         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 594         set_dma_x_modify(uart->rx_dma_channel, 1);
 595         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 596         set_dma_y_modify(uart->rx_dma_channel, 1);
 597         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 598         enable_dma(uart->rx_dma_channel);
 599
 600         uart->rx_dma_timer.data = (unsigned long)(uart);
 601         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 602         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 603         add_timer(&(uart->rx_dma_timer));
 604 #else
 605 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 606         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 607         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 608                 kgdboc_break_enabled = 0;
 609         else {
 610 # endif
 611         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 612              "BFIN_UART_RX", uart)) {
 613                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 614                 return -EBUSY;
 615         }
 616
 617         if (request_irq
 618             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 619              "BFIN_UART_TX", uart)) {
 620                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 621                 free_irq(uart->port.irq, uart);
 622                 return -EBUSY;
 623         }
 624
 625 # ifdef CONFIG_BF54x
 626         {
 627                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 628
 629                 switch (uart->port.irq) {
 630                 case IRQ_UART3_RX:
 631                         uart_dma_ch_rx = CH_UART3_RX;
 632                         uart_dma_ch_tx = CH_UART3_TX;
 633                         break;
 634                 case IRQ_UART2_RX:
 635                         uart_dma_ch_rx = CH_UART2_RX;
 636                         uart_dma_ch_tx = CH_UART2_TX;
 637                         break;
 638                 default:
 639                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
 640                         break;
 641                 };
 642
 643                 if (uart_dma_ch_rx &&
 644                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 645                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
 646                         free_irq(uart->port.irq, uart);
 647                         free_irq(uart->port.irq + 1, uart);
 648                         return -EBUSY;
 649                 }
 650                 if (uart_dma_ch_tx &&
 651                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 652                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 653                         free_dma(uart_dma_ch_rx);
 654                         free_irq(uart->port.irq, uart);
 655                         free_irq(uart->port.irq + 1, uart);
 656                         return -EBUSY;
 657                 }
 658         }
 659 # endif
 660 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 661         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 662         }
 663 # endif
 664 #endif
 665         UART_SET_IER(uart, ERBFI);
 666         return 0;
 667 }
 668
 669 static void bfin_serial_shutdown(struct uart_port *port)
 670 {
 671         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 672
 673 #ifdef CONFIG_SERIAL_BFIN_DMA
 674         disable_dma(uart->tx_dma_channel);
 675         free_dma(uart->tx_dma_channel);
 676         disable_dma(uart->rx_dma_channel);
 677         free_dma(uart->rx_dma_channel);
 678         del_timer(&(uart->rx_dma_timer));
 679         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 680 #else
 681 #ifdef CONFIG_BF54x
 682         switch (uart->port.irq) {
 683         case IRQ_UART3_RX:
 684                 free_dma(CH_UART3_RX);
 685                 free_dma(CH_UART3_TX);
 686                 break;
 687         case IRQ_UART2_RX:
 688                 free_dma(CH_UART2_RX);
 689                 free_dma(CH_UART2_TX);
 690                 break;
 691         default:
 692                 break;
 693         };
 694 #endif
 695         free_irq(uart->port.irq, uart);
 696         free_irq(uart->port.irq+1, uart);
 697 #endif
 698 }
 699
 700 static void
 701 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 702                    struct ktermios *old)
 703 {
 704         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 705         unsigned long flags;
 706         unsigned int baud, quot;
 707         unsigned short val, ier, lcr = 0;
 708
 709         switch (termios->c_cflag & CSIZE) {
 710         case CS8:
 711                 lcr = WLS(8);
 712                 break;
 713         case CS7:
 714                 lcr = WLS(7);
 715                 break;
 716         case CS6:
 717                 lcr = WLS(6);
 718                 break;
 719         case CS5:
 720                 lcr = WLS(5);
 721                 break;
 722         default:
 723                 printk(KERN_ERR "%s: word lengh not supported\n",
 724                         __func__);
 725         }
 726
 727         if (termios->c_cflag & CSTOPB)
 728                 lcr |= STB;
 729         if (termios->c_cflag & PARENB)
 730                 lcr |= PEN;
 731         if (!(termios->c_cflag & PARODD))
 732                 lcr |= EPS;
 733         if (termios->c_cflag & CMSPAR)
 734                 lcr |= STP;
 735
 736         port->read_status_mask = OE;
 737         if (termios->c_iflag & INPCK)
 738                 port->read_status_mask |= (FE | PE);
 739         if (termios->c_iflag & (BRKINT | PARMRK))
 740                 port->read_status_mask |= BI;
 741
 742         /*
 743          * Characters to ignore
 744          */
 745         port->ignore_status_mask = 0;
 746         if (termios->c_iflag & IGNPAR)
 747                 port->ignore_status_mask |= FE | PE;
 748         if (termios->c_iflag & IGNBRK) {
 749                 port->ignore_status_mask |= BI;
 750                 /*
 751                  * If we're ignoring parity and break indicators,
 752                  * ignore overruns too (for real raw support).
 753                  */
 754                 if (termios->c_iflag & IGNPAR)
 755                         port->ignore_status_mask |= OE;
 756         }
 757
 758         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 759         quot = uart_get_divisor(port, baud);
 760         spin_lock_irqsave(&uart->port.lock, flags);
 761
 762         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 763
 764         /* Disable UART */
 765         ier = UART_GET_IER(uart);
 766         UART_DISABLE_INTS(uart);
 767
 768         /* Set DLAB in LCR to Access DLL and DLH */
 769         UART_SET_DLAB(uart);
 770
 771         UART_PUT_DLL(uart, quot & 0xFF);
 772         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 773         SSYNC();
 774
 775         /* Clear DLAB in LCR to Access THR RBR IER */
 776         UART_CLEAR_DLAB(uart);
 777
 778         UART_PUT_LCR(uart, lcr);
 779
 780         /* Enable UART */
 781         UART_ENABLE_INTS(uart, ier);
 782
 783         val = UART_GET_GCTL(uart);
 784         val |= UCEN;
 785         UART_PUT_GCTL(uart, val);
 786
 787         /* Port speed changed, update the per-port timeout. */
 788         uart_update_timeout(port, termios->c_cflag, baud);
 789
 790         spin_unlock_irqrestore(&uart->port.lock, flags);
 791 }
 792
 793 static const char *bfin_serial_type(struct uart_port *port)
 794 {
 795         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 796
 797         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 798 }
 799
 800 /*
 801  * Release the memory region(s) being used by 'port'.
 802  */
 803 static void bfin_serial_release_port(struct uart_port *port)
 804 {
 805 }
 806
 807 /*
 808  * Request the memory region(s) being used by 'port'.
 809  */
 810 static int bfin_serial_request_port(struct uart_port *port)
 811 {
 812         return 0;
 813 }
 814
 815 /*
 816  * Configure/autoconfigure the port.
 817  */
 818 static void bfin_serial_config_port(struct uart_port *port, int flags)
 819 {
 820         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 821
 822         if (flags & UART_CONFIG_TYPE &&
 823             bfin_serial_request_port(&uart->port) == 0)
 824                 uart->port.type = PORT_BFIN;
 825 }
 826
 827 /*
 828  * Verify the new serial_struct (for TIOCSSERIAL).
 829  * The only change we allow are to the flags and type, and
 830  * even then only between PORT_BFIN and PORT_UNKNOWN
 831  */
 832 static int
 833 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 834 {
 835         return 0;
 836 }
 837
 838 /*
 839  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 840  * In other cases, disable IrDA function.
 841  */
 842 static void bfin_serial_set_ldisc(struct uart_port *port)
 843 {
 844         int line = port->line;
 845         unsigned short val;
 846
 847         if (line >= port->info->port.tty->driver->num)
 848                 return;
 849
 850         switch (port->info->port.tty->termios->c_line) {
 851         case N_IRDA:
 852                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 853                 val |= (IREN | RPOLC);
 854                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 855                 break;
 856         default:
 857                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 858                 val &= ~(IREN | RPOLC);
 859                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 860         }
 861 }
 862
 863 #ifdef CONFIG_CONSOLE_POLL
 864 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
 865 {
 866         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 867
 868         while (!(UART_GET_LSR(uart) & THRE))
 869                 cpu_relax();
 870
 871         UART_CLEAR_DLAB(uart);
 872         UART_PUT_CHAR(uart, (unsigned char)chr);
 873 }
 874
 875 static int bfin_serial_poll_get_char(struct uart_port *port)
 876 {
 877         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 878         unsigned char chr;
 879
 880         while (!(UART_GET_LSR(uart) & DR))
 881                 cpu_relax();
 882
 883         UART_CLEAR_DLAB(uart);
 884         chr = UART_GET_CHAR(uart);
 885
 886         return chr;
 887 }
 888 #endif
 889
 890 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 891         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 892 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
 893 {
 894         if (kgdboc_break_enabled) {
 895                 kgdboc_break_enabled = 0;
 896                 bfin_serial_shutdown(port);
 897         }
 898 }
 899
 900 static int bfin_kgdboc_port_startup(struct uart_port *port)
 901 {
 902         kgdboc_port_line = port->line;
 903         kgdboc_break_enabled = !bfin_serial_startup(port);
 904         return 0;
 905 }
 906 #endif
 907
 908 static void bfin_serial_reset_irda(struct uart_port *port)
 909 {
 910         int line = port->line;
 911         unsigned short val;
 912
 913         val = UART_GET_GCTL(&bfin_serial_ports[line]);
 914         val &= ~(IREN | RPOLC);
 915         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 916         SSYNC();
 917         val |= (IREN | RPOLC);
 918         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 919         SSYNC();
 920 }
 921
 922 static struct uart_ops bfin_serial_pops = {
 923         .tx_empty       = bfin_serial_tx_empty,
 924         .set_mctrl      = bfin_serial_set_mctrl,
 925         .get_mctrl      = bfin_serial_get_mctrl,
 926         .stop_tx        = bfin_serial_stop_tx,
 927         .start_tx       = bfin_serial_start_tx,
 928         .stop_rx        = bfin_serial_stop_rx,
 929         .enable_ms      = bfin_serial_enable_ms,
 930         .break_ctl      = bfin_serial_break_ctl,
 931         .startup        = bfin_serial_startup,
 932         .shutdown       = bfin_serial_shutdown,
 933         .set_termios    = bfin_serial_set_termios,
 934         .set_ldisc      = bfin_serial_set_ldisc,
 935         .type           = bfin_serial_type,
 936         .release_port   = bfin_serial_release_port,
 937         .request_port   = bfin_serial_request_port,
 938         .config_port    = bfin_serial_config_port,
 939         .verify_port    = bfin_serial_verify_port,
 940 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 941         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 942         .kgdboc_port_startup    = bfin_kgdboc_port_startup,
 943         .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
 944 #endif
 945 #ifdef CONFIG_CONSOLE_POLL
 946         .poll_put_char  = bfin_serial_poll_put_char,
 947         .poll_get_char  = bfin_serial_poll_get_char,
 948 #endif
 949 };
 950
 951 static void __init bfin_serial_init_ports(void)
 952 {
 953         static int first = 1;
 954         int i;
 955
 956         if (!first)
 957                 return;
 958         first = 0;
 959
 960         for (i = 0; i < nr_active_ports; i++) {
 961                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 962                 bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
 963                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 964                 bfin_serial_ports[i].port.line      = i;
 965                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 966                 bfin_serial_ports[i].port.membase   =
 967                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 968                 bfin_serial_ports[i].port.mapbase   =
 969                         bfin_serial_resource[i].uart_base_addr;
 970                 bfin_serial_ports[i].port.irq       =
 971                         bfin_serial_resource[i].uart_irq;
 972                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 973 #ifdef CONFIG_SERIAL_BFIN_DMA
 974                 bfin_serial_ports[i].tx_done        = 1;
 975                 bfin_serial_ports[i].tx_count       = 0;
 976                 bfin_serial_ports[i].tx_dma_channel =
 977                         bfin_serial_resource[i].uart_tx_dma_channel;
 978                 bfin_serial_ports[i].rx_dma_channel =
 979                         bfin_serial_resource[i].uart_rx_dma_channel;
 980                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 981 #endif
 982 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 983                 init_timer(&(bfin_serial_ports[i].cts_timer));
 984                 bfin_serial_ports[i].cts_pin        =
 985                         bfin_serial_resource[i].uart_cts_pin;
 986                 bfin_serial_ports[i].rts_pin        =
 987                         bfin_serial_resource[i].uart_rts_pin;
 988 #endif
 989                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 990         }
 991
 992 }
 993
 994 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
 995 /*
 996  * If the port was already initialised (eg, by a boot loader),
 997  * try to determine the current setup.
 998  */
 999 static void __init
1000 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1001                            int *parity, int *bits)
1002 {
1003         unsigned short status;
1004
1005         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1006         if (status == (ERBFI | ETBEI)) {
1007                 /* ok, the port was enabled */
1008                 u16 lcr, dlh, dll;
1009
1010                 lcr = UART_GET_LCR(uart);
1011
1012                 *parity = 'n';
1013                 if (lcr & PEN) {
1014                         if (lcr & EPS)
1015                                 *parity = 'e';
1016                         else
1017                                 *parity = 'o';
1018                 }
1019                 switch (lcr & 0x03) {
1020                         case 0: *bits = 5; break;
1021                         case 1: *bits = 6; break;
1022                         case 2: *bits = 7; break;
1023                         case 3: *bits = 8; break;
1024                 }
1025                 /* Set DLAB in LCR to Access DLL and DLH */
1026                 UART_SET_DLAB(uart);
1027
1028                 dll = UART_GET_DLL(uart);
1029                 dlh = UART_GET_DLH(uart);
1030
1031                 /* Clear DLAB in LCR to Access THR RBR IER */
1032                 UART_CLEAR_DLAB(uart);
1033
1034                 *baud = get_sclk() / (16*(dll | dlh << 8));
1035         }
1036         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1037 }
1038
1039 static struct uart_driver bfin_serial_reg;
1040
1041 static int __init
1042 bfin_serial_console_setup(struct console *co, char *options)
1043 {
1044         struct bfin_serial_port *uart;
1045         int baud = 57600;
1046         int bits = 8;
1047         int parity = 'n';
1048 # ifdef CONFIG_SERIAL_BFIN_CTSRTS
1049         int flow = 'r';
1050 # else
1051         int flow = 'n';
1052 # endif
1053
1054         /*
1055          * Check whether an invalid uart number has been specified, and
1056          * if so, search for the first available port that does have
1057          * console support.
1058          */
1059         if (co->index == -1 || co->index >= nr_active_ports)
1060                 co->index = 0;
1061         uart = &bfin_serial_ports[co->index];
1062
1063         if (options)
1064                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1065         else
1066                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1067
1068         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1069 }
1070 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1071                                  defined (CONFIG_EARLY_PRINTK) */
1072
1073 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1074 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1075 {
1076         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1077         while (!(UART_GET_LSR(uart) & THRE))
1078                 barrier();
1079         UART_PUT_CHAR(uart, ch);
1080         SSYNC();
1081 }
1082
1083 /*
1084  * Interrupts are disabled on entering
1085  */
1086 static void
1087 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1088 {
1089         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1090         int flags = 0;
1091
1092         spin_lock_irqsave(&uart->port.lock, flags);
1093         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1094         spin_unlock_irqrestore(&uart->port.lock, flags);
1095
1096 }
1097
1098 static struct console bfin_serial_console = {
1099         .name           = BFIN_SERIAL_NAME,
1100         .write          = bfin_serial_console_write,
1101         .device         = uart_console_device,
1102         .setup          = bfin_serial_console_setup,
1103         .flags          = CON_PRINTBUFFER,
1104         .index          = -1,
1105         .data           = &bfin_serial_reg,
1106 };
1107
1108 static int __init bfin_serial_rs_console_init(void)
1109 {
1110         bfin_serial_init_ports();
1111         register_console(&bfin_serial_console);
1112
1113         return 0;
1114 }
1115 console_initcall(bfin_serial_rs_console_init);
1116
1117 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1118 #else
1119 #define BFIN_SERIAL_CONSOLE     NULL
1120 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1121
1122
1123 #ifdef CONFIG_EARLY_PRINTK
1124 static __init void early_serial_putc(struct uart_port *port, int ch)
1125 {
1126         unsigned timeout = 0xffff;
1127         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1128
1129         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1130                 cpu_relax();
1131         UART_PUT_CHAR(uart, ch);
1132 }
1133
1134 static __init void early_serial_write(struct console *con, const char *s,
1135                                         unsigned int n)
1136 {
1137         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1138         unsigned int i;
1139
1140         for (i = 0; i < n; i++, s++) {
1141                 if (*s == '\n')
1142                         early_serial_putc(&uart->port, '\r');
1143                 early_serial_putc(&uart->port, *s);
1144         }
1145 }
1146
1147 static struct __initdata console bfin_early_serial_console = {
1148         .name = "early_BFuart",
1149         .write = early_serial_write,
1150         .device = uart_console_device,
1151         .flags = CON_PRINTBUFFER,
1152         .setup = bfin_serial_console_setup,
1153         .index = -1,
1154         .data  = &bfin_serial_reg,
1155 };
1156
1157 struct console __init *bfin_earlyserial_init(unsigned int port,
1158                                                 unsigned int cflag)
1159 {
1160         struct bfin_serial_port *uart;
1161         struct ktermios t;
1162
1163         if (port == -1 || port >= nr_active_ports)
1164                 port = 0;
1165         bfin_serial_init_ports();
1166         bfin_early_serial_console.index = port;
1167         uart = &bfin_serial_ports[port];
1168         t.c_cflag = cflag;
1169         t.c_iflag = 0;
1170         t.c_oflag = 0;
1171         t.c_lflag = ICANON;
1172         t.c_line = port;
1173         bfin_serial_set_termios(&uart->port, &t, &t);
1174         return &bfin_early_serial_console;
1175 }
1176
1177 #endif /* CONFIG_EARLY_PRINTK */
1178
1179 static struct uart_driver bfin_serial_reg = {
1180         .owner                  = THIS_MODULE,
1181         .driver_name            = "bfin-uart",
1182         .dev_name               = BFIN_SERIAL_NAME,
1183         .major                  = BFIN_SERIAL_MAJOR,
1184         .minor                  = BFIN_SERIAL_MINOR,
1185         .nr                     = BFIN_UART_NR_PORTS,
1186         .cons                   = BFIN_SERIAL_CONSOLE,
1187 };
1188
1189 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1190 {
1191         int i;
1192
1193         for (i = 0; i < nr_active_ports; i++) {
1194                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1195                         continue;
1196                 uart_suspend_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1197         }
1198
1199         return 0;
1200 }
1201
1202 static int bfin_serial_resume(struct platform_device *dev)
1203 {
1204         int i;
1205
1206         for (i = 0; i < nr_active_ports; i++) {
1207                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1208                         continue;
1209                 uart_resume_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1210         }
1211
1212         return 0;
1213 }
1214
1215 static int bfin_serial_probe(struct platform_device *dev)
1216 {
1217         struct resource *res = dev->resource;
1218         int i;
1219
1220         for (i = 0; i < dev->num_resources; i++, res++)
1221                 if (res->flags & IORESOURCE_MEM)
1222                         break;
1223
1224         if (i < dev->num_resources) {
1225                 for (i = 0; i < nr_active_ports; i++, res++) {
1226                         if (bfin_serial_ports[i].port.mapbase != res->start)
1227                                 continue;
1228                         bfin_serial_ports[i].port.dev = &dev->dev;
1229                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1230                 }
1231         }
1232
1233         return 0;
1234 }
1235
1236 static int bfin_serial_remove(struct platform_device *dev)
1237 {
1238         int i;
1239
1240         for (i = 0; i < nr_active_ports; i++) {
1241                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1242                         continue;
1243                 uart_remove_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1244                 bfin_serial_ports[i].port.dev = NULL;
1245 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1246                 gpio_free(bfin_serial_ports[i].cts_pin);
1247                 gpio_free(bfin_serial_ports[i].rts_pin);
1248 #endif
1249         }
1250
1251         return 0;
1252 }
1253
1254 static struct platform_driver bfin_serial_driver = {
1255         .probe          = bfin_serial_probe,
1256         .remove         = bfin_serial_remove,
1257         .suspend        = bfin_serial_suspend,
1258         .resume         = bfin_serial_resume,
1259         .driver         = {
1260                 .name   = "bfin-uart",
1261                 .owner  = THIS_MODULE,
1262         },
1263 };
1264
1265 static int __init bfin_serial_init(void)
1266 {
1267         int ret;
1268
1269         pr_info("Serial: Blackfin serial driver\n");
1270
1271         bfin_serial_init_ports();
1272
1273         ret = uart_register_driver(&bfin_serial_reg);
1274         if (ret == 0) {
1275                 ret = platform_driver_register(&bfin_serial_driver);
1276                 if (ret) {
1277                         pr_debug("uart register failed\n");
1278                         uart_unregister_driver(&bfin_serial_reg);
1279                 }
1280         }
1281         return ret;
1282 }
1283
1284 static void __exit bfin_serial_exit(void)
1285 {
1286         platform_driver_unregister(&bfin_serial_driver);
1287         uart_unregister_driver(&bfin_serial_reg);
1288 }
1289
1290
1291 module_init(bfin_serial_init);
1292 module_exit(bfin_serial_exit);
1293
1294 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1295 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1296 MODULE_LICENSE("GPL");
1297 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1298 MODULE_ALIAS("platform:bfin-uart");