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