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++) {
 405                 if (i >= UART_XMIT_SIZE)
 406                         i = 0;
 407                 if (i == uart->rx_dma_buf.head)
 408                         break;
 409                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 410                         uart_insert_char(&uart->port, status, OE,
 411                                 uart->rx_dma_buf.buf[i], flg);
 412         }
 413
 414  dma_ignore_char:
 415         tty_flip_buffer_push(tty);
 416 }
 417
 418 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 419 {
 420         int x_pos, pos;
 421         unsigned long flags;
 422
 423         spin_lock_irqsave(&uart->port.lock, flags);
 424
 425         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 426         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 427         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 428         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
 429                 uart->rx_dma_nrows = 0;
 430         x_pos = DMA_RX_XCOUNT - x_pos;
 431         if (x_pos == DMA_RX_XCOUNT)
 432                 x_pos = 0;
 433
 434         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 435         if (pos != uart->rx_dma_buf.tail) {
 436                 uart->rx_dma_buf.head = pos;
 437                 bfin_serial_dma_rx_chars(uart);
 438                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 439         }
 440
 441         spin_unlock_irqrestore(&uart->port.lock, flags);
 442
 443         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 444 }
 445
 446 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 447 {
 448         struct bfin_serial_port *uart = dev_id;
 449         struct circ_buf *xmit = &uart->port.info->xmit;
 450
 451         spin_lock(&uart->port.lock);
 452         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 453                 disable_dma(uart->tx_dma_channel);
 454                 clear_dma_irqstat(uart->tx_dma_channel);
 455                 UART_CLEAR_IER(uart, ETBEI);
 456                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 457                 uart->port.icount.tx += uart->tx_count;
 458
 459                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 460                         uart_write_wakeup(&uart->port);
 461
 462                 bfin_serial_dma_tx_chars(uart);
 463         }
 464
 465         spin_unlock(&uart->port.lock);
 466         return IRQ_HANDLED;
 467 }
 468
 469 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 470 {
 471         struct bfin_serial_port *uart = dev_id;
 472         unsigned short irqstat;
 473
 474         spin_lock(&uart->port.lock);
 475         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 476         clear_dma_irqstat(uart->rx_dma_channel);
 477         bfin_serial_dma_rx_chars(uart);
 478         spin_unlock(&uart->port.lock);
 479
 480         return IRQ_HANDLED;
 481 }
 482 #endif
 483
 484 /*
 485  * Return TIOCSER_TEMT when transmitter is not busy.
 486  */
 487 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 488 {
 489         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 490         unsigned short lsr;
 491
 492         lsr = UART_GET_LSR(uart);
 493         if (lsr & TEMT)
 494                 return TIOCSER_TEMT;
 495         else
 496                 return 0;
 497 }
 498
 499 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 500 {
 501 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 502         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 503         if (uart->cts_pin < 0)
 504                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 505
 506         if (UART_GET_CTS(uart))
 507                 return TIOCM_DSR | TIOCM_CAR;
 508         else
 509 #endif
 510                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 511 }
 512
 513 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 514 {
 515 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 516         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 517         if (uart->rts_pin < 0)
 518                 return;
 519
 520         if (mctrl & TIOCM_RTS)
 521                 UART_CLEAR_RTS(uart);
 522         else
 523                 UART_SET_RTS(uart);
 524 #endif
 525 }
 526
 527 /*
 528  * Handle any change of modem status signal since we were last called.
 529  */
 530 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 531 {
 532 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 533         unsigned int status;
 534         struct uart_info *info = uart->port.info;
 535         struct tty_struct *tty = info->port.tty;
 536
 537         status = bfin_serial_get_mctrl(&uart->port);
 538         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 539         if (!(status & TIOCM_CTS)) {
 540                 tty->hw_stopped = 1;
 541                 uart->cts_timer.data = (unsigned long)(uart);
 542                 uart->cts_timer.function = (void *)bfin_serial_mctrl_check;
 543                 uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES;
 544                 add_timer(&(uart->cts_timer));
 545         } else {
 546                 tty->hw_stopped = 0;
 547         }
 548 #endif
 549 }
 550
 551 /*
 552  * Interrupts are always disabled.
 553  */
 554 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 555 {
 556         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 557         u16 lcr = UART_GET_LCR(uart);
 558         if (break_state)
 559                 lcr |= SB;
 560         else
 561                 lcr &= ~SB;
 562         UART_PUT_LCR(uart, lcr);
 563         SSYNC();
 564 }
 565
 566 static int bfin_serial_startup(struct uart_port *port)
 567 {
 568         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 569
 570 #ifdef CONFIG_SERIAL_BFIN_DMA
 571         dma_addr_t dma_handle;
 572
 573         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 574                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 575                 return -EBUSY;
 576         }
 577
 578         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 579                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 580                 free_dma(uart->rx_dma_channel);
 581                 return -EBUSY;
 582         }
 583
 584         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 585         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 586
 587         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 588         uart->rx_dma_buf.head = 0;
 589         uart->rx_dma_buf.tail = 0;
 590         uart->rx_dma_nrows = 0;
 591
 592         set_dma_config(uart->rx_dma_channel,
 593                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 594                                 INTR_ON_ROW, DIMENSION_2D,
 595                                 DATA_SIZE_8,
 596                                 DMA_SYNC_RESTART));
 597         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 598         set_dma_x_modify(uart->rx_dma_channel, 1);
 599         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 600         set_dma_y_modify(uart->rx_dma_channel, 1);
 601         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 602         enable_dma(uart->rx_dma_channel);
 603
 604         uart->rx_dma_timer.data = (unsigned long)(uart);
 605         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 606         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 607         add_timer(&(uart->rx_dma_timer));
 608 #else
 609 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 610         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 611         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 612                 kgdboc_break_enabled = 0;
 613         else {
 614 # endif
 615         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 616              "BFIN_UART_RX", uart)) {
 617                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 618                 return -EBUSY;
 619         }
 620
 621         if (request_irq
 622             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 623              "BFIN_UART_TX", uart)) {
 624                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 625                 free_irq(uart->port.irq, uart);
 626                 return -EBUSY;
 627         }
 628
 629 # ifdef CONFIG_BF54x
 630         {
 631                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 632
 633                 switch (uart->port.irq) {
 634                 case IRQ_UART3_RX:
 635                         uart_dma_ch_rx = CH_UART3_RX;
 636                         uart_dma_ch_tx = CH_UART3_TX;
 637                         break;
 638                 case IRQ_UART2_RX:
 639                         uart_dma_ch_rx = CH_UART2_RX;
 640                         uart_dma_ch_tx = CH_UART2_TX;
 641                         break;
 642                 default:
 643                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
 644                         break;
 645                 };
 646
 647                 if (uart_dma_ch_rx &&
 648                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 649                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
 650                         free_irq(uart->port.irq, uart);
 651                         free_irq(uart->port.irq + 1, uart);
 652                         return -EBUSY;
 653                 }
 654                 if (uart_dma_ch_tx &&
 655                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 656                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 657                         free_dma(uart_dma_ch_rx);
 658                         free_irq(uart->port.irq, uart);
 659                         free_irq(uart->port.irq + 1, uart);
 660                         return -EBUSY;
 661                 }
 662         }
 663 # endif
 664 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 665         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 666         }
 667 # endif
 668 #endif
 669         UART_SET_IER(uart, ERBFI);
 670         return 0;
 671 }
 672
 673 static void bfin_serial_shutdown(struct uart_port *port)
 674 {
 675         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 676
 677 #ifdef CONFIG_SERIAL_BFIN_DMA
 678         disable_dma(uart->tx_dma_channel);
 679         free_dma(uart->tx_dma_channel);
 680         disable_dma(uart->rx_dma_channel);
 681         free_dma(uart->rx_dma_channel);
 682         del_timer(&(uart->rx_dma_timer));
 683         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 684 #else
 685 #ifdef CONFIG_BF54x
 686         switch (uart->port.irq) {
 687         case IRQ_UART3_RX:
 688                 free_dma(CH_UART3_RX);
 689                 free_dma(CH_UART3_TX);
 690                 break;
 691         case IRQ_UART2_RX:
 692                 free_dma(CH_UART2_RX);
 693                 free_dma(CH_UART2_TX);
 694                 break;
 695         default:
 696                 break;
 697         };
 698 #endif
 699         free_irq(uart->port.irq, uart);
 700         free_irq(uart->port.irq+1, uart);
 701 #endif
 702 }
 703
 704 static void
 705 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 706                    struct ktermios *old)
 707 {
 708         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 709         unsigned long flags;
 710         unsigned int baud, quot;
 711         unsigned short val, ier, lcr = 0;
 712
 713         switch (termios->c_cflag & CSIZE) {
 714         case CS8:
 715                 lcr = WLS(8);
 716                 break;
 717         case CS7:
 718                 lcr = WLS(7);
 719                 break;
 720         case CS6:
 721                 lcr = WLS(6);
 722                 break;
 723         case CS5:
 724                 lcr = WLS(5);
 725                 break;
 726         default:
 727                 printk(KERN_ERR "%s: word lengh not supported\n",
 728                         __func__);
 729         }
 730
 731         if (termios->c_cflag & CSTOPB)
 732                 lcr |= STB;
 733         if (termios->c_cflag & PARENB)
 734                 lcr |= PEN;
 735         if (!(termios->c_cflag & PARODD))
 736                 lcr |= EPS;
 737         if (termios->c_cflag & CMSPAR)
 738                 lcr |= STP;
 739
 740         port->read_status_mask = OE;
 741         if (termios->c_iflag & INPCK)
 742                 port->read_status_mask |= (FE | PE);
 743         if (termios->c_iflag & (BRKINT | PARMRK))
 744                 port->read_status_mask |= BI;
 745
 746         /*
 747          * Characters to ignore
 748          */
 749         port->ignore_status_mask = 0;
 750         if (termios->c_iflag & IGNPAR)
 751                 port->ignore_status_mask |= FE | PE;
 752         if (termios->c_iflag & IGNBRK) {
 753                 port->ignore_status_mask |= BI;
 754                 /*
 755                  * If we're ignoring parity and break indicators,
 756                  * ignore overruns too (for real raw support).
 757                  */
 758                 if (termios->c_iflag & IGNPAR)
 759                         port->ignore_status_mask |= OE;
 760         }
 761
 762         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 763         quot = uart_get_divisor(port, baud) - ANOMALY_05000230;
 764         spin_lock_irqsave(&uart->port.lock, flags);
 765
 766         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 767
 768         /* Disable UART */
 769         ier = UART_GET_IER(uart);
 770         UART_DISABLE_INTS(uart);
 771
 772         /* Set DLAB in LCR to Access DLL and DLH */
 773         UART_SET_DLAB(uart);
 774
 775         UART_PUT_DLL(uart, quot & 0xFF);
 776         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 777         SSYNC();
 778
 779         /* Clear DLAB in LCR to Access THR RBR IER */
 780         UART_CLEAR_DLAB(uart);
 781
 782         UART_PUT_LCR(uart, lcr);
 783
 784         /* Enable UART */
 785         UART_ENABLE_INTS(uart, ier);
 786
 787         val = UART_GET_GCTL(uart);
 788         val |= UCEN;
 789         UART_PUT_GCTL(uart, val);
 790
 791         /* Port speed changed, update the per-port timeout. */
 792         uart_update_timeout(port, termios->c_cflag, baud);
 793
 794         spin_unlock_irqrestore(&uart->port.lock, flags);
 795 }
 796
 797 static const char *bfin_serial_type(struct uart_port *port)
 798 {
 799         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 800
 801         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 802 }
 803
 804 /*
 805  * Release the memory region(s) being used by 'port'.
 806  */
 807 static void bfin_serial_release_port(struct uart_port *port)
 808 {
 809 }
 810
 811 /*
 812  * Request the memory region(s) being used by 'port'.
 813  */
 814 static int bfin_serial_request_port(struct uart_port *port)
 815 {
 816         return 0;
 817 }
 818
 819 /*
 820  * Configure/autoconfigure the port.
 821  */
 822 static void bfin_serial_config_port(struct uart_port *port, int flags)
 823 {
 824         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 825
 826         if (flags & UART_CONFIG_TYPE &&
 827             bfin_serial_request_port(&uart->port) == 0)
 828                 uart->port.type = PORT_BFIN;
 829 }
 830
 831 /*
 832  * Verify the new serial_struct (for TIOCSSERIAL).
 833  * The only change we allow are to the flags and type, and
 834  * even then only between PORT_BFIN and PORT_UNKNOWN
 835  */
 836 static int
 837 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 838 {
 839         return 0;
 840 }
 841
 842 /*
 843  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 844  * In other cases, disable IrDA function.
 845  */
 846 static void bfin_serial_set_ldisc(struct uart_port *port)
 847 {
 848         int line = port->line;
 849         unsigned short val;
 850
 851         if (line >= port->info->port.tty->driver->num)
 852                 return;
 853
 854         switch (port->info->port.tty->termios->c_line) {
 855         case N_IRDA:
 856                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 857                 val |= (IREN | RPOLC);
 858                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 859                 break;
 860         default:
 861                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 862                 val &= ~(IREN | RPOLC);
 863                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 864         }
 865 }
 866
 867 #ifdef CONFIG_CONSOLE_POLL
 868 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
 869 {
 870         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 871
 872         while (!(UART_GET_LSR(uart) & THRE))
 873                 cpu_relax();
 874
 875         UART_CLEAR_DLAB(uart);
 876         UART_PUT_CHAR(uart, (unsigned char)chr);
 877 }
 878
 879 static int bfin_serial_poll_get_char(struct uart_port *port)
 880 {
 881         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 882         unsigned char chr;
 883
 884         while (!(UART_GET_LSR(uart) & DR))
 885                 cpu_relax();
 886
 887         UART_CLEAR_DLAB(uart);
 888         chr = UART_GET_CHAR(uart);
 889
 890         return chr;
 891 }
 892 #endif
 893
 894 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 895         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 896 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
 897 {
 898         if (kgdboc_break_enabled) {
 899                 kgdboc_break_enabled = 0;
 900                 bfin_serial_shutdown(port);
 901         }
 902 }
 903
 904 static int bfin_kgdboc_port_startup(struct uart_port *port)
 905 {
 906         kgdboc_port_line = port->line;
 907         kgdboc_break_enabled = !bfin_serial_startup(port);
 908         return 0;
 909 }
 910 #endif
 911
 912 static void bfin_serial_reset_irda(struct uart_port *port)
 913 {
 914         int line = port->line;
 915         unsigned short val;
 916
 917         val = UART_GET_GCTL(&bfin_serial_ports[line]);
 918         val &= ~(IREN | RPOLC);
 919         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 920         SSYNC();
 921         val |= (IREN | RPOLC);
 922         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 923         SSYNC();
 924 }
 925
 926 static struct uart_ops bfin_serial_pops = {
 927         .tx_empty       = bfin_serial_tx_empty,
 928         .set_mctrl      = bfin_serial_set_mctrl,
 929         .get_mctrl      = bfin_serial_get_mctrl,
 930         .stop_tx        = bfin_serial_stop_tx,
 931         .start_tx       = bfin_serial_start_tx,
 932         .stop_rx        = bfin_serial_stop_rx,
 933         .enable_ms      = bfin_serial_enable_ms,
 934         .break_ctl      = bfin_serial_break_ctl,
 935         .startup        = bfin_serial_startup,
 936         .shutdown       = bfin_serial_shutdown,
 937         .set_termios    = bfin_serial_set_termios,
 938         .set_ldisc      = bfin_serial_set_ldisc,
 939         .type           = bfin_serial_type,
 940         .release_port   = bfin_serial_release_port,
 941         .request_port   = bfin_serial_request_port,
 942         .config_port    = bfin_serial_config_port,
 943         .verify_port    = bfin_serial_verify_port,
 944 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 945         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 946         .kgdboc_port_startup    = bfin_kgdboc_port_startup,
 947         .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
 948 #endif
 949 #ifdef CONFIG_CONSOLE_POLL
 950         .poll_put_char  = bfin_serial_poll_put_char,
 951         .poll_get_char  = bfin_serial_poll_get_char,
 952 #endif
 953 };
 954
 955 static void __init bfin_serial_init_ports(void)
 956 {
 957         static int first = 1;
 958         int i;
 959
 960         if (!first)
 961                 return;
 962         first = 0;
 963
 964         for (i = 0; i < nr_active_ports; i++) {
 965                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 966                 bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
 967                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 968                 bfin_serial_ports[i].port.line      = i;
 969                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 970                 bfin_serial_ports[i].port.membase   =
 971                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 972                 bfin_serial_ports[i].port.mapbase   =
 973                         bfin_serial_resource[i].uart_base_addr;
 974                 bfin_serial_ports[i].port.irq       =
 975                         bfin_serial_resource[i].uart_irq;
 976                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 977 #ifdef CONFIG_SERIAL_BFIN_DMA
 978                 bfin_serial_ports[i].tx_done        = 1;
 979                 bfin_serial_ports[i].tx_count       = 0;
 980                 bfin_serial_ports[i].tx_dma_channel =
 981                         bfin_serial_resource[i].uart_tx_dma_channel;
 982                 bfin_serial_ports[i].rx_dma_channel =
 983                         bfin_serial_resource[i].uart_rx_dma_channel;
 984                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 985 #endif
 986 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 987                 init_timer(&(bfin_serial_ports[i].cts_timer));
 988                 bfin_serial_ports[i].cts_pin        =
 989                         bfin_serial_resource[i].uart_cts_pin;
 990                 bfin_serial_ports[i].rts_pin        =
 991                         bfin_serial_resource[i].uart_rts_pin;
 992 #endif
 993                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 994         }
 995
 996 }
 997
 998 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
 999 /*
1000  * If the port was already initialised (eg, by a boot loader),
1001  * try to determine the current setup.
1002  */
1003 static void __init
1004 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1005                            int *parity, int *bits)
1006 {
1007         unsigned short status;
1008
1009         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1010         if (status == (ERBFI | ETBEI)) {
1011                 /* ok, the port was enabled */
1012                 u16 lcr, dlh, dll;
1013
1014                 lcr = UART_GET_LCR(uart);
1015
1016                 *parity = 'n';
1017                 if (lcr & PEN) {
1018                         if (lcr & EPS)
1019                                 *parity = 'e';
1020                         else
1021                                 *parity = 'o';
1022                 }
1023                 switch (lcr & 0x03) {
1024                         case 0: *bits = 5; break;
1025                         case 1: *bits = 6; break;
1026                         case 2: *bits = 7; break;
1027                         case 3: *bits = 8; break;
1028                 }
1029                 /* Set DLAB in LCR to Access DLL and DLH */
1030                 UART_SET_DLAB(uart);
1031
1032                 dll = UART_GET_DLL(uart);
1033                 dlh = UART_GET_DLH(uart);
1034
1035                 /* Clear DLAB in LCR to Access THR RBR IER */
1036                 UART_CLEAR_DLAB(uart);
1037
1038                 *baud = get_sclk() / (16*(dll | dlh << 8));
1039         }
1040         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1041 }
1042
1043 static struct uart_driver bfin_serial_reg;
1044
1045 static int __init
1046 bfin_serial_console_setup(struct console *co, char *options)
1047 {
1048         struct bfin_serial_port *uart;
1049         int baud = 57600;
1050         int bits = 8;
1051         int parity = 'n';
1052 # ifdef CONFIG_SERIAL_BFIN_CTSRTS
1053         int flow = 'r';
1054 # else
1055         int flow = 'n';
1056 # endif
1057
1058         /*
1059          * Check whether an invalid uart number has been specified, and
1060          * if so, search for the first available port that does have
1061          * console support.
1062          */
1063         if (co->index == -1 || co->index >= nr_active_ports)
1064                 co->index = 0;
1065         uart = &bfin_serial_ports[co->index];
1066
1067         if (options)
1068                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1069         else
1070                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1071
1072         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1073 }
1074 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1075                                  defined (CONFIG_EARLY_PRINTK) */
1076
1077 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1078 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1079 {
1080         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1081         while (!(UART_GET_LSR(uart) & THRE))
1082                 barrier();
1083         UART_PUT_CHAR(uart, ch);
1084         SSYNC();
1085 }
1086
1087 /*
1088  * Interrupts are disabled on entering
1089  */
1090 static void
1091 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1092 {
1093         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1094         unsigned long flags;
1095
1096         spin_lock_irqsave(&uart->port.lock, flags);
1097         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1098         spin_unlock_irqrestore(&uart->port.lock, flags);
1099
1100 }
1101
1102 static struct console bfin_serial_console = {
1103         .name           = BFIN_SERIAL_NAME,
1104         .write          = bfin_serial_console_write,
1105         .device         = uart_console_device,
1106         .setup          = bfin_serial_console_setup,
1107         .flags          = CON_PRINTBUFFER,
1108         .index          = -1,
1109         .data           = &bfin_serial_reg,
1110 };
1111
1112 static int __init bfin_serial_rs_console_init(void)
1113 {
1114         bfin_serial_init_ports();
1115         register_console(&bfin_serial_console);
1116
1117         return 0;
1118 }
1119 console_initcall(bfin_serial_rs_console_init);
1120
1121 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1122 #else
1123 #define BFIN_SERIAL_CONSOLE     NULL
1124 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1125
1126
1127 #ifdef CONFIG_EARLY_PRINTK
1128 static __init void early_serial_putc(struct uart_port *port, int ch)
1129 {
1130         unsigned timeout = 0xffff;
1131         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1132
1133         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1134                 cpu_relax();
1135         UART_PUT_CHAR(uart, ch);
1136 }
1137
1138 static __init void early_serial_write(struct console *con, const char *s,
1139                                         unsigned int n)
1140 {
1141         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1142         unsigned int i;
1143
1144         for (i = 0; i < n; i++, s++) {
1145                 if (*s == '\n')
1146                         early_serial_putc(&uart->port, '\r');
1147                 early_serial_putc(&uart->port, *s);
1148         }
1149 }
1150
1151 static struct __initdata console bfin_early_serial_console = {
1152         .name = "early_BFuart",
1153         .write = early_serial_write,
1154         .device = uart_console_device,
1155         .flags = CON_PRINTBUFFER,
1156         .setup = bfin_serial_console_setup,
1157         .index = -1,
1158         .data  = &bfin_serial_reg,
1159 };
1160
1161 struct console __init *bfin_earlyserial_init(unsigned int port,
1162                                                 unsigned int cflag)
1163 {
1164         struct bfin_serial_port *uart;
1165         struct ktermios t;
1166
1167         if (port == -1 || port >= nr_active_ports)
1168                 port = 0;
1169         bfin_serial_init_ports();
1170         bfin_early_serial_console.index = port;
1171         uart = &bfin_serial_ports[port];
1172         t.c_cflag = cflag;
1173         t.c_iflag = 0;
1174         t.c_oflag = 0;
1175         t.c_lflag = ICANON;
1176         t.c_line = port;
1177         bfin_serial_set_termios(&uart->port, &t, &t);
1178         return &bfin_early_serial_console;
1179 }
1180
1181 #endif /* CONFIG_EARLY_PRINTK */
1182
1183 static struct uart_driver bfin_serial_reg = {
1184         .owner                  = THIS_MODULE,
1185         .driver_name            = "bfin-uart",
1186         .dev_name               = BFIN_SERIAL_NAME,
1187         .major                  = BFIN_SERIAL_MAJOR,
1188         .minor                  = BFIN_SERIAL_MINOR,
1189         .nr                     = BFIN_UART_NR_PORTS,
1190         .cons                   = BFIN_SERIAL_CONSOLE,
1191 };
1192
1193 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1194 {
1195         int i;
1196
1197         for (i = 0; i < nr_active_ports; i++) {
1198                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1199                         continue;
1200                 uart_suspend_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1201         }
1202
1203         return 0;
1204 }
1205
1206 static int bfin_serial_resume(struct platform_device *dev)
1207 {
1208         int i;
1209
1210         for (i = 0; i < nr_active_ports; i++) {
1211                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1212                         continue;
1213                 uart_resume_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1214         }
1215
1216         return 0;
1217 }
1218
1219 static int bfin_serial_probe(struct platform_device *dev)
1220 {
1221         struct resource *res = dev->resource;
1222         int i;
1223
1224         for (i = 0; i < dev->num_resources; i++, res++)
1225                 if (res->flags & IORESOURCE_MEM)
1226                         break;
1227
1228         if (i < dev->num_resources) {
1229                 for (i = 0; i < nr_active_ports; i++, res++) {
1230                         if (bfin_serial_ports[i].port.mapbase != res->start)
1231                                 continue;
1232                         bfin_serial_ports[i].port.dev = &dev->dev;
1233                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1234                 }
1235         }
1236
1237         return 0;
1238 }
1239
1240 static int bfin_serial_remove(struct platform_device *dev)
1241 {
1242         int i;
1243
1244         for (i = 0; i < nr_active_ports; i++) {
1245                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1246                         continue;
1247                 uart_remove_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1248                 bfin_serial_ports[i].port.dev = NULL;
1249 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1250                 gpio_free(bfin_serial_ports[i].cts_pin);
1251                 gpio_free(bfin_serial_ports[i].rts_pin);
1252 #endif
1253         }
1254
1255         return 0;
1256 }
1257
1258 static struct platform_driver bfin_serial_driver = {
1259         .probe          = bfin_serial_probe,
1260         .remove         = bfin_serial_remove,
1261         .suspend        = bfin_serial_suspend,
1262         .resume         = bfin_serial_resume,
1263         .driver         = {
1264                 .name   = "bfin-uart",
1265                 .owner  = THIS_MODULE,
1266         },
1267 };
1268
1269 static int __init bfin_serial_init(void)
1270 {
1271         int ret;
1272
1273         pr_info("Serial: Blackfin serial driver\n");
1274
1275         bfin_serial_init_ports();
1276
1277         ret = uart_register_driver(&bfin_serial_reg);
1278         if (ret == 0) {
1279                 ret = platform_driver_register(&bfin_serial_driver);
1280                 if (ret) {
1281                         pr_debug("uart register failed\n");
1282                         uart_unregister_driver(&bfin_serial_reg);
1283                 }
1284         }
1285         return ret;
1286 }
1287
1288 static void __exit bfin_serial_exit(void)
1289 {
1290         platform_driver_unregister(&bfin_serial_driver);
1291         uart_unregister_driver(&bfin_serial_reg);
1292 }
1293
1294
1295 module_init(bfin_serial_init);
1296 module_exit(bfin_serial_exit);
1297
1298 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1299 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1300 MODULE_LICENSE("GPL");
1301 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1302 MODULE_ALIAS("platform:bfin-uart");