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->port.tty)
 178                 return;
 179 #endif
 180         tty = uart->port.info->port.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                         status &= ~BI;
 223                         anomaly_start.tv_sec = 0;
 224                 }
 225         }
 226
 227         if (status & BI) {
 228                 if (ANOMALY_05000363)
 229                         if (bfin_revid() < 5)
 230                                 do_gettimeofday(&anomaly_start);
 231                 uart->port.icount.brk++;
 232                 if (uart_handle_break(&uart->port))
 233                         goto ignore_char;
 234                 status &= ~(PE | FE);
 235         }
 236         if (status & PE)
 237                 uart->port.icount.parity++;
 238         if (status & OE)
 239                 uart->port.icount.overrun++;
 240         if (status & FE)
 241                 uart->port.icount.frame++;
 242
 243         status &= uart->port.read_status_mask;
 244
 245         if (status & BI)
 246                 flg = TTY_BREAK;
 247         else if (status & PE)
 248                 flg = TTY_PARITY;
 249         else if (status & FE)
 250                 flg = TTY_FRAME;
 251         else
 252                 flg = TTY_NORMAL;
 253
 254         if (uart_handle_sysrq_char(&uart->port, ch))
 255                 goto ignore_char;
 256
 257         uart_insert_char(&uart->port, status, OE, ch, flg);
 258
 259  ignore_char:
 260         tty_flip_buffer_push(tty);
 261 }
 262
 263 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 264 {
 265         struct circ_buf *xmit = &uart->port.info->xmit;
 266
 267         /*
 268          * Check the modem control lines before
 269          * transmitting anything.
 270          */
 271         bfin_serial_mctrl_check(uart);
 272
 273         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 274 #ifdef CONFIG_BF54x
 275                 /* Clear TFI bit */
 276                 UART_PUT_LSR(uart, TFI);
 277 #endif
 278                 UART_CLEAR_IER(uart, ETBEI);
 279                 return;
 280         }
 281
 282         if (uart->port.x_char) {
 283                 UART_PUT_CHAR(uart, uart->port.x_char);
 284                 uart->port.icount.tx++;
 285                 uart->port.x_char = 0;
 286         }
 287
 288         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 289                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 290                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 291                 uart->port.icount.tx++;
 292                 SSYNC();
 293         }
 294
 295         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 296                 uart_write_wakeup(&uart->port);
 297 }
 298
 299 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 300 {
 301         struct bfin_serial_port *uart = dev_id;
 302
 303         spin_lock(&uart->port.lock);
 304         while (UART_GET_LSR(uart) & DR)
 305                 bfin_serial_rx_chars(uart);
 306         spin_unlock(&uart->port.lock);
 307
 308         return IRQ_HANDLED;
 309 }
 310
 311 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 312 {
 313         struct bfin_serial_port *uart = dev_id;
 314
 315         spin_lock(&uart->port.lock);
 316         if (UART_GET_LSR(uart) & THRE)
 317                 bfin_serial_tx_chars(uart);
 318         spin_unlock(&uart->port.lock);
 319
 320         return IRQ_HANDLED;
 321 }
 322 #endif
 323
 324 #ifdef CONFIG_SERIAL_BFIN_DMA
 325 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 326 {
 327         struct circ_buf *xmit = &uart->port.info->xmit;
 328
 329         uart->tx_done = 0;
 330
 331         /*
 332          * Check the modem control lines before
 333          * transmitting anything.
 334          */
 335         bfin_serial_mctrl_check(uart);
 336
 337         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 338                 uart->tx_count = 0;
 339                 uart->tx_done = 1;
 340                 return;
 341         }
 342
 343         if (uart->port.x_char) {
 344                 UART_PUT_CHAR(uart, uart->port.x_char);
 345                 uart->port.icount.tx++;
 346                 uart->port.x_char = 0;
 347         }
 348
 349         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 350         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 351                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 352         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 353                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 354         set_dma_config(uart->tx_dma_channel,
 355                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 356                         INTR_ON_BUF,
 357                         DIMENSION_LINEAR,
 358                         DATA_SIZE_8,
 359                         DMA_SYNC_RESTART));
 360         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 361         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 362         set_dma_x_modify(uart->tx_dma_channel, 1);
 363         enable_dma(uart->tx_dma_channel);
 364
 365         UART_SET_IER(uart, ETBEI);
 366 }
 367
 368 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 369 {
 370         struct tty_struct *tty = uart->port.info->port.tty;
 371         int i, flg, status;
 372
 373         status = UART_GET_LSR(uart);
 374         UART_CLEAR_LSR(uart);
 375
 376         uart->port.icount.rx +=
 377                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 378                 UART_XMIT_SIZE);
 379
 380         if (status & BI) {
 381                 uart->port.icount.brk++;
 382                 if (uart_handle_break(&uart->port))
 383                         goto dma_ignore_char;
 384                 status &= ~(PE | FE);
 385         }
 386         if (status & PE)
 387                 uart->port.icount.parity++;
 388         if (status & OE)
 389                 uart->port.icount.overrun++;
 390         if (status & FE)
 391                 uart->port.icount.frame++;
 392
 393         status &= uart->port.read_status_mask;
 394
 395         if (status & BI)
 396                 flg = TTY_BREAK;
 397         else if (status & PE)
 398                 flg = TTY_PARITY;
 399         else if (status & FE)
 400                 flg = TTY_FRAME;
 401         else
 402                 flg = TTY_NORMAL;
 403
 404         for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
 405                 if (i >= UART_XMIT_SIZE)
 406                         i = 0;
 407                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 408                         uart_insert_char(&uart->port, status, OE,
 409                                 uart->rx_dma_buf.buf[i], flg);
 410         }
 411
 412  dma_ignore_char:
 413         tty_flip_buffer_push(tty);
 414 }
 415
 416 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 417 {
 418         int x_pos, pos;
 419         unsigned long flags;
 420
 421         spin_lock_irqsave(&uart->port.lock, flags);
 422
 423         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 424         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 425         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 426         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
 427                 uart->rx_dma_nrows = 0;
 428         x_pos = DMA_RX_XCOUNT - x_pos;
 429         if (x_pos == DMA_RX_XCOUNT)
 430                 x_pos = 0;
 431
 432         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 433         if (pos != uart->rx_dma_buf.tail) {
 434                 uart->rx_dma_buf.head = pos;
 435                 bfin_serial_dma_rx_chars(uart);
 436                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 437         }
 438
 439         spin_unlock_irqrestore(&uart->port.lock, flags);
 440
 441         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 442 }
 443
 444 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 445 {
 446         struct bfin_serial_port *uart = dev_id;
 447         struct circ_buf *xmit = &uart->port.info->xmit;
 448
 449         spin_lock(&uart->port.lock);
 450         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 451                 disable_dma(uart->tx_dma_channel);
 452                 clear_dma_irqstat(uart->tx_dma_channel);
 453                 UART_CLEAR_IER(uart, ETBEI);
 454                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 455                 uart->port.icount.tx += uart->tx_count;
 456
 457                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 458                         uart_write_wakeup(&uart->port);
 459
 460                 bfin_serial_dma_tx_chars(uart);
 461         }
 462
 463         spin_unlock(&uart->port.lock);
 464         return IRQ_HANDLED;
 465 }
 466
 467 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 468 {
 469         struct bfin_serial_port *uart = dev_id;
 470         unsigned short irqstat;
 471
 472         spin_lock(&uart->port.lock);
 473         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 474         clear_dma_irqstat(uart->rx_dma_channel);
 475         bfin_serial_dma_rx_chars(uart);
 476         spin_unlock(&uart->port.lock);
 477
 478         return IRQ_HANDLED;
 479 }
 480 #endif
 481
 482 /*
 483  * Return TIOCSER_TEMT when transmitter is not busy.
 484  */
 485 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 486 {
 487         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 488         unsigned short lsr;
 489
 490         lsr = UART_GET_LSR(uart);
 491         if (lsr & TEMT)
 492                 return TIOCSER_TEMT;
 493         else
 494                 return 0;
 495 }
 496
 497 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 498 {
 499 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 500         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 501         if (uart->cts_pin < 0)
 502                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 503
 504         if (UART_GET_CTS(uart))
 505                 return TIOCM_DSR | TIOCM_CAR;
 506         else
 507 #endif
 508                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 509 }
 510
 511 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 512 {
 513 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 514         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 515         if (uart->rts_pin < 0)
 516                 return;
 517
 518         if (mctrl & TIOCM_RTS)
 519                 UART_CLEAR_RTS(uart);
 520         else
 521                 UART_SET_RTS(uart);
 522 #endif
 523 }
 524
 525 /*
 526  * Handle any change of modem status signal since we were last called.
 527  */
 528 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 529 {
 530 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 531         unsigned int status;
 532         struct uart_info *info = uart->port.info;
 533         struct tty_struct *tty = info->port.tty;
 534
 535         status = bfin_serial_get_mctrl(&uart->port);
 536         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 537         if (!(status & TIOCM_CTS)) {
 538                 tty->hw_stopped = 1;
 539                 uart->cts_timer.data = (unsigned long)(uart);
 540                 uart->cts_timer.function = (void *)bfin_serial_mctrl_check;
 541                 uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES;
 542                 add_timer(&(uart->cts_timer));
 543         } else {
 544                 tty->hw_stopped = 0;
 545         }
 546 #endif
 547 }
 548
 549 /*
 550  * Interrupts are always disabled.
 551  */
 552 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 553 {
 554         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 555         u16 lcr = UART_GET_LCR(uart);
 556         if (break_state)
 557                 lcr |= SB;
 558         else
 559                 lcr &= ~SB;
 560         UART_PUT_LCR(uart, lcr);
 561         SSYNC();
 562 }
 563
 564 static int bfin_serial_startup(struct uart_port *port)
 565 {
 566         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 567
 568 #ifdef CONFIG_SERIAL_BFIN_DMA
 569         dma_addr_t dma_handle;
 570
 571         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 572                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 573                 return -EBUSY;
 574         }
 575
 576         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 577                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 578                 free_dma(uart->rx_dma_channel);
 579                 return -EBUSY;
 580         }
 581
 582         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 583         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 584
 585         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 586         uart->rx_dma_buf.head = 0;
 587         uart->rx_dma_buf.tail = 0;
 588         uart->rx_dma_nrows = 0;
 589
 590         set_dma_config(uart->rx_dma_channel,
 591                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 592                                 INTR_ON_ROW, DIMENSION_2D,
 593                                 DATA_SIZE_8,
 594                                 DMA_SYNC_RESTART));
 595         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 596         set_dma_x_modify(uart->rx_dma_channel, 1);
 597         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 598         set_dma_y_modify(uart->rx_dma_channel, 1);
 599         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 600         enable_dma(uart->rx_dma_channel);
 601
 602         uart->rx_dma_timer.data = (unsigned long)(uart);
 603         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 604         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 605         add_timer(&(uart->rx_dma_timer));
 606 #else
 607 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 608         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 609         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 610                 kgdboc_break_enabled = 0;
 611         else {
 612 # endif
 613         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 614              "BFIN_UART_RX", uart)) {
 615                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 616                 return -EBUSY;
 617         }
 618
 619         if (request_irq
 620             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 621              "BFIN_UART_TX", uart)) {
 622                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 623                 free_irq(uart->port.irq, uart);
 624                 return -EBUSY;
 625         }
 626
 627 # ifdef CONFIG_BF54x
 628         {
 629                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 630
 631                 switch (uart->port.irq) {
 632                 case IRQ_UART3_RX:
 633                         uart_dma_ch_rx = CH_UART3_RX;
 634                         uart_dma_ch_tx = CH_UART3_TX;
 635                         break;
 636                 case IRQ_UART2_RX:
 637                         uart_dma_ch_rx = CH_UART2_RX;
 638                         uart_dma_ch_tx = CH_UART2_TX;
 639                         break;
 640                 default:
 641                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
 642                         break;
 643                 };
 644
 645                 if (uart_dma_ch_rx &&
 646                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 647                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
 648                         free_irq(uart->port.irq, uart);
 649                         free_irq(uart->port.irq + 1, uart);
 650                         return -EBUSY;
 651                 }
 652                 if (uart_dma_ch_tx &&
 653                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 654                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 655                         free_dma(uart_dma_ch_rx);
 656                         free_irq(uart->port.irq, uart);
 657                         free_irq(uart->port.irq + 1, uart);
 658                         return -EBUSY;
 659                 }
 660         }
 661 # endif
 662 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 663         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 664         }
 665 # endif
 666 #endif
 667         UART_SET_IER(uart, ERBFI);
 668         return 0;
 669 }
 670
 671 static void bfin_serial_shutdown(struct uart_port *port)
 672 {
 673         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 674
 675 #ifdef CONFIG_SERIAL_BFIN_DMA
 676         disable_dma(uart->tx_dma_channel);
 677         free_dma(uart->tx_dma_channel);
 678         disable_dma(uart->rx_dma_channel);
 679         free_dma(uart->rx_dma_channel);
 680         del_timer(&(uart->rx_dma_timer));
 681         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 682 #else
 683 #ifdef CONFIG_BF54x
 684         switch (uart->port.irq) {
 685         case IRQ_UART3_RX:
 686                 free_dma(CH_UART3_RX);
 687                 free_dma(CH_UART3_TX);
 688                 break;
 689         case IRQ_UART2_RX:
 690                 free_dma(CH_UART2_RX);
 691                 free_dma(CH_UART2_TX);
 692                 break;
 693         default:
 694                 break;
 695         };
 696 #endif
 697         free_irq(uart->port.irq, uart);
 698         free_irq(uart->port.irq+1, uart);
 699 #endif
 700 }
 701
 702 static void
 703 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 704                    struct ktermios *old)
 705 {
 706         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 707         unsigned long flags;
 708         unsigned int baud, quot;
 709         unsigned short val, ier, lcr = 0;
 710
 711         switch (termios->c_cflag & CSIZE) {
 712         case CS8:
 713                 lcr = WLS(8);
 714                 break;
 715         case CS7:
 716                 lcr = WLS(7);
 717                 break;
 718         case CS6:
 719                 lcr = WLS(6);
 720                 break;
 721         case CS5:
 722                 lcr = WLS(5);
 723                 break;
 724         default:
 725                 printk(KERN_ERR "%s: word lengh not supported\n",
 726                         __func__);
 727         }
 728
 729         if (termios->c_cflag & CSTOPB)
 730                 lcr |= STB;
 731         if (termios->c_cflag & PARENB)
 732                 lcr |= PEN;
 733         if (!(termios->c_cflag & PARODD))
 734                 lcr |= EPS;
 735         if (termios->c_cflag & CMSPAR)
 736                 lcr |= STP;
 737
 738         port->read_status_mask = OE;
 739         if (termios->c_iflag & INPCK)
 740                 port->read_status_mask |= (FE | PE);
 741         if (termios->c_iflag & (BRKINT | PARMRK))
 742                 port->read_status_mask |= BI;
 743
 744         /*
 745          * Characters to ignore
 746          */
 747         port->ignore_status_mask = 0;
 748         if (termios->c_iflag & IGNPAR)
 749                 port->ignore_status_mask |= FE | PE;
 750         if (termios->c_iflag & IGNBRK) {
 751                 port->ignore_status_mask |= BI;
 752                 /*
 753                  * If we're ignoring parity and break indicators,
 754                  * ignore overruns too (for real raw support).
 755                  */
 756                 if (termios->c_iflag & IGNPAR)
 757                         port->ignore_status_mask |= OE;
 758         }
 759
 760         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 761         quot = uart_get_divisor(port, baud);
 762         spin_lock_irqsave(&uart->port.lock, flags);
 763
 764         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 765
 766         /* Disable UART */
 767         ier = UART_GET_IER(uart);
 768         UART_DISABLE_INTS(uart);
 769
 770         /* Set DLAB in LCR to Access DLL and DLH */
 771         UART_SET_DLAB(uart);
 772
 773         UART_PUT_DLL(uart, quot & 0xFF);
 774         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 775         SSYNC();
 776
 777         /* Clear DLAB in LCR to Access THR RBR IER */
 778         UART_CLEAR_DLAB(uart);
 779
 780         UART_PUT_LCR(uart, lcr);
 781
 782         /* Enable UART */
 783         UART_ENABLE_INTS(uart, ier);
 784
 785         val = UART_GET_GCTL(uart);
 786         val |= UCEN;
 787         UART_PUT_GCTL(uart, val);
 788
 789         /* Port speed changed, update the per-port timeout. */
 790         uart_update_timeout(port, termios->c_cflag, baud);
 791
 792         spin_unlock_irqrestore(&uart->port.lock, flags);
 793 }
 794
 795 static const char *bfin_serial_type(struct uart_port *port)
 796 {
 797         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 798
 799         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 800 }
 801
 802 /*
 803  * Release the memory region(s) being used by 'port'.
 804  */
 805 static void bfin_serial_release_port(struct uart_port *port)
 806 {
 807 }
 808
 809 /*
 810  * Request the memory region(s) being used by 'port'.
 811  */
 812 static int bfin_serial_request_port(struct uart_port *port)
 813 {
 814         return 0;
 815 }
 816
 817 /*
 818  * Configure/autoconfigure the port.
 819  */
 820 static void bfin_serial_config_port(struct uart_port *port, int flags)
 821 {
 822         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 823
 824         if (flags & UART_CONFIG_TYPE &&
 825             bfin_serial_request_port(&uart->port) == 0)
 826                 uart->port.type = PORT_BFIN;
 827 }
 828
 829 /*
 830  * Verify the new serial_struct (for TIOCSSERIAL).
 831  * The only change we allow are to the flags and type, and
 832  * even then only between PORT_BFIN and PORT_UNKNOWN
 833  */
 834 static int
 835 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 836 {
 837         return 0;
 838 }
 839
 840 /*
 841  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 842  * In other cases, disable IrDA function.
 843  */
 844 static void bfin_serial_set_ldisc(struct uart_port *port)
 845 {
 846         int line = port->line;
 847         unsigned short val;
 848
 849         if (line >= port->info->port.tty->driver->num)
 850                 return;
 851
 852         switch (port->info->port.tty->termios->c_line) {
 853         case N_IRDA:
 854                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 855                 val |= (IREN | RPOLC);
 856                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 857                 break;
 858         default:
 859                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 860                 val &= ~(IREN | RPOLC);
 861                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 862         }
 863 }
 864
 865 #ifdef CONFIG_CONSOLE_POLL
 866 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
 867 {
 868         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 869
 870         while (!(UART_GET_LSR(uart) & THRE))
 871                 cpu_relax();
 872
 873         UART_CLEAR_DLAB(uart);
 874         UART_PUT_CHAR(uart, (unsigned char)chr);
 875 }
 876
 877 static int bfin_serial_poll_get_char(struct uart_port *port)
 878 {
 879         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 880         unsigned char chr;
 881
 882         while (!(UART_GET_LSR(uart) & DR))
 883                 cpu_relax();
 884
 885         UART_CLEAR_DLAB(uart);
 886         chr = UART_GET_CHAR(uart);
 887
 888         return chr;
 889 }
 890 #endif
 891
 892 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 893         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 894 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
 895 {
 896         if (kgdboc_break_enabled) {
 897                 kgdboc_break_enabled = 0;
 898                 bfin_serial_shutdown(port);
 899         }
 900 }
 901
 902 static int bfin_kgdboc_port_startup(struct uart_port *port)
 903 {
 904         kgdboc_port_line = port->line;
 905         kgdboc_break_enabled = !bfin_serial_startup(port);
 906         return 0;
 907 }
 908 #endif
 909
 910 static void bfin_serial_reset_irda(struct uart_port *port)
 911 {
 912         int line = port->line;
 913         unsigned short val;
 914
 915         val = UART_GET_GCTL(&bfin_serial_ports[line]);
 916         val &= ~(IREN | RPOLC);
 917         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 918         SSYNC();
 919         val |= (IREN | RPOLC);
 920         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 921         SSYNC();
 922 }
 923
 924 static struct uart_ops bfin_serial_pops = {
 925         .tx_empty       = bfin_serial_tx_empty,
 926         .set_mctrl      = bfin_serial_set_mctrl,
 927         .get_mctrl      = bfin_serial_get_mctrl,
 928         .stop_tx        = bfin_serial_stop_tx,
 929         .start_tx       = bfin_serial_start_tx,
 930         .stop_rx        = bfin_serial_stop_rx,
 931         .enable_ms      = bfin_serial_enable_ms,
 932         .break_ctl      = bfin_serial_break_ctl,
 933         .startup        = bfin_serial_startup,
 934         .shutdown       = bfin_serial_shutdown,
 935         .set_termios    = bfin_serial_set_termios,
 936         .set_ldisc      = bfin_serial_set_ldisc,
 937         .type           = bfin_serial_type,
 938         .release_port   = bfin_serial_release_port,
 939         .request_port   = bfin_serial_request_port,
 940         .config_port    = bfin_serial_config_port,
 941         .verify_port    = bfin_serial_verify_port,
 942 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 943         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 944         .kgdboc_port_startup    = bfin_kgdboc_port_startup,
 945         .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
 946 #endif
 947 #ifdef CONFIG_CONSOLE_POLL
 948         .poll_put_char  = bfin_serial_poll_put_char,
 949         .poll_get_char  = bfin_serial_poll_get_char,
 950 #endif
 951 };
 952
 953 static void __init bfin_serial_init_ports(void)
 954 {
 955         static int first = 1;
 956         int i;
 957
 958         if (!first)
 959                 return;
 960         first = 0;
 961
 962         for (i = 0; i < nr_active_ports; i++) {
 963                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 964                 bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
 965                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 966                 bfin_serial_ports[i].port.line      = i;
 967                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 968                 bfin_serial_ports[i].port.membase   =
 969                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 970                 bfin_serial_ports[i].port.mapbase   =
 971                         bfin_serial_resource[i].uart_base_addr;
 972                 bfin_serial_ports[i].port.irq       =
 973                         bfin_serial_resource[i].uart_irq;
 974                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 975 #ifdef CONFIG_SERIAL_BFIN_DMA
 976                 bfin_serial_ports[i].tx_done        = 1;
 977                 bfin_serial_ports[i].tx_count       = 0;
 978                 bfin_serial_ports[i].tx_dma_channel =
 979                         bfin_serial_resource[i].uart_tx_dma_channel;
 980                 bfin_serial_ports[i].rx_dma_channel =
 981                         bfin_serial_resource[i].uart_rx_dma_channel;
 982                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 983 #endif
 984 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 985                 init_timer(&(bfin_serial_ports[i].cts_timer));
 986                 bfin_serial_ports[i].cts_pin        =
 987                         bfin_serial_resource[i].uart_cts_pin;
 988                 bfin_serial_ports[i].rts_pin        =
 989                         bfin_serial_resource[i].uart_rts_pin;
 990 #endif
 991                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 992         }
 993
 994 }
 995
 996 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
 997 /*
 998  * If the port was already initialised (eg, by a boot loader),
 999  * try to determine the current setup.
1000  */
1001 static void __init
1002 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1003                            int *parity, int *bits)
1004 {
1005         unsigned short status;
1006
1007         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1008         if (status == (ERBFI | ETBEI)) {
1009                 /* ok, the port was enabled */
1010                 u16 lcr, dlh, dll;
1011
1012                 lcr = UART_GET_LCR(uart);
1013
1014                 *parity = 'n';
1015                 if (lcr & PEN) {
1016                         if (lcr & EPS)
1017                                 *parity = 'e';
1018                         else
1019                                 *parity = 'o';
1020                 }
1021                 switch (lcr & 0x03) {
1022                         case 0: *bits = 5; break;
1023                         case 1: *bits = 6; break;
1024                         case 2: *bits = 7; break;
1025                         case 3: *bits = 8; break;
1026                 }
1027                 /* Set DLAB in LCR to Access DLL and DLH */
1028                 UART_SET_DLAB(uart);
1029
1030                 dll = UART_GET_DLL(uart);
1031                 dlh = UART_GET_DLH(uart);
1032
1033                 /* Clear DLAB in LCR to Access THR RBR IER */
1034                 UART_CLEAR_DLAB(uart);
1035
1036                 *baud = get_sclk() / (16*(dll | dlh << 8));
1037         }
1038         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1039 }
1040
1041 static struct uart_driver bfin_serial_reg;
1042
1043 static int __init
1044 bfin_serial_console_setup(struct console *co, char *options)
1045 {
1046         struct bfin_serial_port *uart;
1047         int baud = 57600;
1048         int bits = 8;
1049         int parity = 'n';
1050 # ifdef CONFIG_SERIAL_BFIN_CTSRTS
1051         int flow = 'r';
1052 # else
1053         int flow = 'n';
1054 # endif
1055
1056         /*
1057          * Check whether an invalid uart number has been specified, and
1058          * if so, search for the first available port that does have
1059          * console support.
1060          */
1061         if (co->index == -1 || co->index >= nr_active_ports)
1062                 co->index = 0;
1063         uart = &bfin_serial_ports[co->index];
1064
1065         if (options)
1066                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1067         else
1068                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1069
1070         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1071 }
1072 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1073                                  defined (CONFIG_EARLY_PRINTK) */
1074
1075 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1076 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1077 {
1078         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1079         while (!(UART_GET_LSR(uart) & THRE))
1080                 barrier();
1081         UART_PUT_CHAR(uart, ch);
1082         SSYNC();
1083 }
1084
1085 /*
1086  * Interrupts are disabled on entering
1087  */
1088 static void
1089 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1090 {
1091         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1092         unsigned long flags;
1093
1094         spin_lock_irqsave(&uart->port.lock, flags);
1095         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1096         spin_unlock_irqrestore(&uart->port.lock, flags);
1097
1098 }
1099
1100 static struct console bfin_serial_console = {
1101         .name           = BFIN_SERIAL_NAME,
1102         .write          = bfin_serial_console_write,
1103         .device         = uart_console_device,
1104         .setup          = bfin_serial_console_setup,
1105         .flags          = CON_PRINTBUFFER,
1106         .index          = -1,
1107         .data           = &bfin_serial_reg,
1108 };
1109
1110 static int __init bfin_serial_rs_console_init(void)
1111 {
1112         bfin_serial_init_ports();
1113         register_console(&bfin_serial_console);
1114
1115         return 0;
1116 }
1117 console_initcall(bfin_serial_rs_console_init);
1118
1119 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1120 #else
1121 #define BFIN_SERIAL_CONSOLE     NULL
1122 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1123
1124
1125 #ifdef CONFIG_EARLY_PRINTK
1126 static __init void early_serial_putc(struct uart_port *port, int ch)
1127 {
1128         unsigned timeout = 0xffff;
1129         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1130
1131         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1132                 cpu_relax();
1133         UART_PUT_CHAR(uart, ch);
1134 }
1135
1136 static __init void early_serial_write(struct console *con, const char *s,
1137                                         unsigned int n)
1138 {
1139         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1140         unsigned int i;
1141
1142         for (i = 0; i < n; i++, s++) {
1143                 if (*s == '\n')
1144                         early_serial_putc(&uart->port, '\r');
1145                 early_serial_putc(&uart->port, *s);
1146         }
1147 }
1148
1149 static struct __initdata console bfin_early_serial_console = {
1150         .name = "early_BFuart",
1151         .write = early_serial_write,
1152         .device = uart_console_device,
1153         .flags = CON_PRINTBUFFER,
1154         .setup = bfin_serial_console_setup,
1155         .index = -1,
1156         .data  = &bfin_serial_reg,
1157 };
1158
1159 struct console __init *bfin_earlyserial_init(unsigned int port,
1160                                                 unsigned int cflag)
1161 {
1162         struct bfin_serial_port *uart;
1163         struct ktermios t;
1164
1165         if (port == -1 || port >= nr_active_ports)
1166                 port = 0;
1167         bfin_serial_init_ports();
1168         bfin_early_serial_console.index = port;
1169         uart = &bfin_serial_ports[port];
1170         t.c_cflag = cflag;
1171         t.c_iflag = 0;
1172         t.c_oflag = 0;
1173         t.c_lflag = ICANON;
1174         t.c_line = port;
1175         bfin_serial_set_termios(&uart->port, &t, &t);
1176         return &bfin_early_serial_console;
1177 }
1178
1179 #endif /* CONFIG_EARLY_PRINTK */
1180
1181 static struct uart_driver bfin_serial_reg = {
1182         .owner                  = THIS_MODULE,
1183         .driver_name            = "bfin-uart",
1184         .dev_name               = BFIN_SERIAL_NAME,
1185         .major                  = BFIN_SERIAL_MAJOR,
1186         .minor                  = BFIN_SERIAL_MINOR,
1187         .nr                     = BFIN_UART_NR_PORTS,
1188         .cons                   = BFIN_SERIAL_CONSOLE,
1189 };
1190
1191 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1192 {
1193         int i;
1194
1195         for (i = 0; i < nr_active_ports; i++) {
1196                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1197                         continue;
1198                 uart_suspend_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1199         }
1200
1201         return 0;
1202 }
1203
1204 static int bfin_serial_resume(struct platform_device *dev)
1205 {
1206         int i;
1207
1208         for (i = 0; i < nr_active_ports; i++) {
1209                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1210                         continue;
1211                 uart_resume_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1212         }
1213
1214         return 0;
1215 }
1216
1217 static int bfin_serial_probe(struct platform_device *dev)
1218 {
1219         struct resource *res = dev->resource;
1220         int i;
1221
1222         for (i = 0; i < dev->num_resources; i++, res++)
1223                 if (res->flags & IORESOURCE_MEM)
1224                         break;
1225
1226         if (i < dev->num_resources) {
1227                 for (i = 0; i < nr_active_ports; i++, res++) {
1228                         if (bfin_serial_ports[i].port.mapbase != res->start)
1229                                 continue;
1230                         bfin_serial_ports[i].port.dev = &dev->dev;
1231                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1232                 }
1233         }
1234
1235         return 0;
1236 }
1237
1238 static int bfin_serial_remove(struct platform_device *dev)
1239 {
1240         int i;
1241
1242         for (i = 0; i < nr_active_ports; i++) {
1243                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1244                         continue;
1245                 uart_remove_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1246                 bfin_serial_ports[i].port.dev = NULL;
1247 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1248                 gpio_free(bfin_serial_ports[i].cts_pin);
1249                 gpio_free(bfin_serial_ports[i].rts_pin);
1250 #endif
1251         }
1252
1253         return 0;
1254 }
1255
1256 static struct platform_driver bfin_serial_driver = {
1257         .probe          = bfin_serial_probe,
1258         .remove         = bfin_serial_remove,
1259         .suspend        = bfin_serial_suspend,
1260         .resume         = bfin_serial_resume,
1261         .driver         = {
1262                 .name   = "bfin-uart",
1263                 .owner  = THIS_MODULE,
1264         },
1265 };
1266
1267 static int __init bfin_serial_init(void)
1268 {
1269         int ret;
1270
1271         pr_info("Serial: Blackfin serial driver\n");
1272
1273         bfin_serial_init_ports();
1274
1275         ret = uart_register_driver(&bfin_serial_reg);
1276         if (ret == 0) {
1277                 ret = platform_driver_register(&bfin_serial_driver);
1278                 if (ret) {
1279                         pr_debug("uart register failed\n");
1280                         uart_unregister_driver(&bfin_serial_reg);
1281                 }
1282         }
1283         return ret;
1284 }
1285
1286 static void __exit bfin_serial_exit(void)
1287 {
1288         platform_driver_unregister(&bfin_serial_driver);
1289         uart_unregister_driver(&bfin_serial_reg);
1290 }
1291
1292
1293 module_init(bfin_serial_init);
1294 module_exit(bfin_serial_exit);
1295
1296 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1297 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1298 MODULE_LICENSE("GPL");
1299 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1300 MODULE_ALIAS("platform:bfin-uart");