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

   1 /*
   2  * Blackfin On-Chip Serial Driver
   3  *
   4  * Copyright 2006-2007 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 #ifdef CONFIG_KGDB_UART
  26 #include <linux/kgdb.h>
  27 #include <asm/irq_regs.h>
  28 #endif
  29
  30 #include <asm/gpio.h>
  31 #include <asm/mach/bfin_serial_5xx.h>
  32
  33 #ifdef CONFIG_SERIAL_BFIN_DMA
  34 #include <linux/dma-mapping.h>
  35 #include <asm/io.h>
  36 #include <asm/irq.h>
  37 #include <asm/cacheflush.h>
  38 #endif
  39
  40 /* UART name and device definitions */
  41 #define BFIN_SERIAL_NAME        "ttyBF"
  42 #define BFIN_SERIAL_MAJOR       204
  43 #define BFIN_SERIAL_MINOR       64
  44
  45 /*
  46  * Setup for console. Argument comes from the menuconfig
  47  */
  48 #define DMA_RX_XCOUNT           512
  49 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  50
  51 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
  52
  53 #ifdef CONFIG_SERIAL_BFIN_DMA
  54 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  55 #else
  56 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  57 #endif
  58
  59 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
  60
  61 /*
  62  * interrupts are disabled on entry
  63  */
  64 static void bfin_serial_stop_tx(struct uart_port *port)
  65 {
  66         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  67         struct circ_buf *xmit = &uart->port.info->xmit;
  68 #if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
  69         unsigned short ier;
  70 #endif
  71
  72         while (!(UART_GET_LSR(uart) & TEMT))
  73                 cpu_relax();
  74
  75 #ifdef CONFIG_SERIAL_BFIN_DMA
  76         disable_dma(uart->tx_dma_channel);
  77         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
  78         uart->port.icount.tx += uart->tx_count;
  79         uart->tx_count = 0;
  80         uart->tx_done = 1;
  81 #else
  82 #ifdef CONFIG_BF54x
  83         /* Clear TFI bit */
  84         UART_PUT_LSR(uart, TFI);
  85         UART_CLEAR_IER(uart, ETBEI);
  86 #else
  87         ier = UART_GET_IER(uart);
  88         ier &= ~ETBEI;
  89         UART_PUT_IER(uart, ier);
  90 #endif
  91 #endif
  92 }
  93
  94 /*
  95  * port is locked and interrupts are disabled
  96  */
  97 static void bfin_serial_start_tx(struct uart_port *port)
  98 {
  99         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 100
 101 #ifdef CONFIG_SERIAL_BFIN_DMA
 102         if (uart->tx_done)
 103                 bfin_serial_dma_tx_chars(uart);
 104 #else
 105 #ifdef CONFIG_BF54x
 106         UART_SET_IER(uart, ETBEI);
 107 #else
 108         unsigned short ier;
 109         ier = UART_GET_IER(uart);
 110         ier |= ETBEI;
 111         UART_PUT_IER(uart, ier);
 112 #endif
 113         bfin_serial_tx_chars(uart);
 114 #endif
 115 }
 116
 117 /*
 118  * Interrupts are enabled
 119  */
 120 static void bfin_serial_stop_rx(struct uart_port *port)
 121 {
 122         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 123 #ifdef  CONFIG_KGDB_UART
 124         if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 125 #endif
 126 #ifdef CONFIG_BF54x
 127         UART_CLEAR_IER(uart, ERBFI);
 128 #else
 129         unsigned short ier;
 130
 131         ier = UART_GET_IER(uart);
 132         ier &= ~ERBFI;
 133         UART_PUT_IER(uart, ier);
 134 #endif
 135 #ifdef  CONFIG_KGDB_UART
 136         }
 137 #endif
 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 #ifdef CONFIG_KGDB_UART
 148 static int kgdb_entry_state;
 149
 150 void kgdb_put_debug_char(int chr)
 151 {
 152         struct bfin_serial_port *uart;
 153
 154         if (CONFIG_KGDB_UART_PORT < 0
 155                 || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
 156                 uart = &bfin_serial_ports[0];
 157         else
 158                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 159
 160         while (!(UART_GET_LSR(uart) & THRE)) {
 161                 SSYNC();
 162         }
 163
 164 #ifndef CONFIG_BF54x
 165         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 166         SSYNC();
 167 #endif
 168         UART_PUT_CHAR(uart, (unsigned char)chr);
 169         SSYNC();
 170 }
 171
 172 int kgdb_get_debug_char(void)
 173 {
 174         struct bfin_serial_port *uart;
 175         unsigned char chr;
 176
 177         if (CONFIG_KGDB_UART_PORT < 0
 178                 || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
 179                 uart = &bfin_serial_ports[0];
 180         else
 181                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 182
 183         while(!(UART_GET_LSR(uart) & DR)) {
 184                 SSYNC();
 185         }
 186 #ifndef CONFIG_BF54x
 187         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 188         SSYNC();
 189 #endif
 190         chr = UART_GET_CHAR(uart);
 191         SSYNC();
 192
 193         return chr;
 194 }
 195 #endif
 196
 197 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
 198 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 199 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 200 #else
 201 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 202 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 203 #endif
 204
 205 #ifdef CONFIG_SERIAL_BFIN_PIO
 206 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 207 {
 208         struct tty_struct *tty = uart->port.info->tty;
 209         unsigned int status, ch, flg;
 210         static struct timeval anomaly_start = { .tv_sec = 0 };
 211 #ifdef CONFIG_KGDB_UART
 212         struct pt_regs *regs = get_irq_regs();
 213 #endif
 214
 215         status = UART_GET_LSR(uart);
 216         UART_CLEAR_LSR(uart);
 217
 218         ch = UART_GET_CHAR(uart);
 219         uart->port.icount.rx++;
 220
 221 #ifdef CONFIG_KGDB_UART
 222         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
 223                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
 224                         kgdb_breakkey_pressed(regs);
 225                         return;
 226                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
 227                         kgdb_entry_state = 1;
 228                 } else if (kgdb_entry_state == 1 && ch == 'q') {
 229                         kgdb_entry_state = 0;
 230                         kgdb_breakkey_pressed(regs);
 231                         return;
 232                 } else if (ch == 0x3) {/* Ctrl + C */
 233                         kgdb_entry_state = 0;
 234                         kgdb_breakkey_pressed(regs);
 235                         return;
 236                 } else {
 237                         kgdb_entry_state = 0;
 238                 }
 239         }
 240 #endif
 241
 242         if (ANOMALY_05000363) {
 243                 /* The BF533 (and BF561) family of processors have a nice anomaly
 244                  * where they continuously generate characters for a "single" break.
 245                  * We have to basically ignore this flood until the "next" valid
 246                  * character comes across.  Due to the nature of the flood, it is
 247                  * not possible to reliably catch bytes that are sent too quickly
 248                  * after this break.  So application code talking to the Blackfin
 249                  * which sends a break signal must allow at least 1.5 character
 250                  * times after the end of the break for things to stabilize.  This
 251                  * timeout was picked as it must absolutely be larger than 1
 252                  * character time +/- some percent.  So 1.5 sounds good.  All other
 253                  * Blackfin families operate properly.  Woo.
 254                  */
 255                 if (anomaly_start.tv_sec) {
 256                         struct timeval curr;
 257                         suseconds_t usecs;
 258
 259                         if ((~ch & (~ch + 1)) & 0xff)
 260                                 goto known_good_char;
 261
 262                         do_gettimeofday(&curr);
 263                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
 264                                 goto known_good_char;
 265
 266                         usecs = 0;
 267                         if (curr.tv_sec != anomaly_start.tv_sec)
 268                                 usecs += USEC_PER_SEC;
 269                         usecs += curr.tv_usec - anomaly_start.tv_usec;
 270
 271                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
 272                                 goto known_good_char;
 273
 274                         if (ch)
 275                                 anomaly_start.tv_sec = 0;
 276                         else
 277                                 anomaly_start = curr;
 278
 279                         return;
 280
 281  known_good_char:
 282                         anomaly_start.tv_sec = 0;
 283                 }
 284         }
 285
 286         if (status & BI) {
 287                 if (ANOMALY_05000363)
 288                         if (bfin_revid() < 5)
 289                                 do_gettimeofday(&anomaly_start);
 290                 uart->port.icount.brk++;
 291                 if (uart_handle_break(&uart->port))
 292                         goto ignore_char;
 293                 status &= ~(PE | FE);
 294         }
 295         if (status & PE)
 296                 uart->port.icount.parity++;
 297         if (status & OE)
 298                 uart->port.icount.overrun++;
 299         if (status & FE)
 300                 uart->port.icount.frame++;
 301
 302         status &= uart->port.read_status_mask;
 303
 304         if (status & BI)
 305                 flg = TTY_BREAK;
 306         else if (status & PE)
 307                 flg = TTY_PARITY;
 308         else if (status & FE)
 309                 flg = TTY_FRAME;
 310         else
 311                 flg = TTY_NORMAL;
 312
 313         if (uart_handle_sysrq_char(&uart->port, ch))
 314                 goto ignore_char;
 315
 316         uart_insert_char(&uart->port, status, OE, ch, flg);
 317
 318  ignore_char:
 319         tty_flip_buffer_push(tty);
 320 }
 321
 322 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 323 {
 324         struct circ_buf *xmit = &uart->port.info->xmit;
 325
 326         if (uart->port.x_char) {
 327                 UART_PUT_CHAR(uart, uart->port.x_char);
 328                 uart->port.icount.tx++;
 329                 uart->port.x_char = 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                 bfin_serial_stop_tx(&uart->port);
 339                 return;
 340         }
 341
 342         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 343                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 344                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 345                 uart->port.icount.tx++;
 346                 SSYNC();
 347         }
 348
 349         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 350                 uart_write_wakeup(&uart->port);
 351
 352         if (uart_circ_empty(xmit))
 353                 bfin_serial_stop_tx(&uart->port);
 354 }
 355
 356 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 357 {
 358         struct bfin_serial_port *uart = dev_id;
 359
 360         spin_lock(&uart->port.lock);
 361         while (UART_GET_LSR(uart) & DR)
 362                 bfin_serial_rx_chars(uart);
 363         spin_unlock(&uart->port.lock);
 364
 365         return IRQ_HANDLED;
 366 }
 367
 368 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 369 {
 370         struct bfin_serial_port *uart = dev_id;
 371
 372         spin_lock(&uart->port.lock);
 373         if (UART_GET_LSR(uart) & THRE)
 374                 bfin_serial_tx_chars(uart);
 375         spin_unlock(&uart->port.lock);
 376
 377         return IRQ_HANDLED;
 378 }
 379 #endif
 380
 381 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 382 static void bfin_serial_do_work(struct work_struct *work)
 383 {
 384         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 385
 386         bfin_serial_mctrl_check(uart);
 387 }
 388 #endif
 389
 390 #ifdef CONFIG_SERIAL_BFIN_DMA
 391 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 392 {
 393         struct circ_buf *xmit = &uart->port.info->xmit;
 394         unsigned short ier;
 395
 396         uart->tx_done = 0;
 397
 398         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 399                 uart->tx_count = 0;
 400                 uart->tx_done = 1;
 401                 return;
 402         }
 403
 404         if (uart->port.x_char) {
 405                 UART_PUT_CHAR(uart, uart->port.x_char);
 406                 uart->port.icount.tx++;
 407                 uart->port.x_char = 0;
 408         }
 409
 410         /*
 411          * Check the modem control lines before
 412          * transmitting anything.
 413          */
 414         bfin_serial_mctrl_check(uart);
 415
 416         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 417         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 418                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 419         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 420                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 421         set_dma_config(uart->tx_dma_channel,
 422                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 423                         INTR_ON_BUF,
 424                         DIMENSION_LINEAR,
 425                         DATA_SIZE_8,
 426                         DMA_SYNC_RESTART));
 427         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 428         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 429         set_dma_x_modify(uart->tx_dma_channel, 1);
 430         enable_dma(uart->tx_dma_channel);
 431
 432 #ifdef CONFIG_BF54x
 433         UART_SET_IER(uart, ETBEI);
 434 #else
 435         ier = UART_GET_IER(uart);
 436         ier |= ETBEI;
 437         UART_PUT_IER(uart, ier);
 438 #endif
 439 }
 440
 441 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 442 {
 443         struct tty_struct *tty = uart->port.info->tty;
 444         int i, flg, status;
 445
 446         status = UART_GET_LSR(uart);
 447         UART_CLEAR_LSR(uart);
 448
 449         uart->port.icount.rx +=
 450                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 451                 UART_XMIT_SIZE);
 452
 453         if (status & BI) {
 454                 uart->port.icount.brk++;
 455                 if (uart_handle_break(&uart->port))
 456                         goto dma_ignore_char;
 457                 status &= ~(PE | FE);
 458         }
 459         if (status & PE)
 460                 uart->port.icount.parity++;
 461         if (status & OE)
 462                 uart->port.icount.overrun++;
 463         if (status & FE)
 464                 uart->port.icount.frame++;
 465
 466         status &= uart->port.read_status_mask;
 467
 468         if (status & BI)
 469                 flg = TTY_BREAK;
 470         else if (status & PE)
 471                 flg = TTY_PARITY;
 472         else if (status & FE)
 473                 flg = TTY_FRAME;
 474         else
 475                 flg = TTY_NORMAL;
 476
 477         for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
 478                 if (i >= UART_XMIT_SIZE)
 479                         i = 0;
 480                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 481                         uart_insert_char(&uart->port, status, OE,
 482                                 uart->rx_dma_buf.buf[i], flg);
 483         }
 484
 485  dma_ignore_char:
 486         tty_flip_buffer_push(tty);
 487 }
 488
 489 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 490 {
 491         int x_pos, pos;
 492
 493         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 494         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 495         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 496         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
 497                 uart->rx_dma_nrows = 0;
 498         x_pos = DMA_RX_XCOUNT - x_pos;
 499         if (x_pos == DMA_RX_XCOUNT)
 500                 x_pos = 0;
 501
 502         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 503         if (pos != uart->rx_dma_buf.tail) {
 504                 uart->rx_dma_buf.head = pos;
 505                 bfin_serial_dma_rx_chars(uart);
 506                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 507         }
 508
 509         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 510 }
 511
 512 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 513 {
 514         struct bfin_serial_port *uart = dev_id;
 515         struct circ_buf *xmit = &uart->port.info->xmit;
 516         unsigned short ier;
 517
 518         spin_lock(&uart->port.lock);
 519         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 520                 disable_dma(uart->tx_dma_channel);
 521                 clear_dma_irqstat(uart->tx_dma_channel);
 522 #ifdef CONFIG_BF54x
 523                 UART_CLEAR_IER(uart, ETBEI);
 524 #else
 525                 ier = UART_GET_IER(uart);
 526                 ier &= ~ETBEI;
 527                 UART_PUT_IER(uart, ier);
 528 #endif
 529                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 530                 uart->port.icount.tx += uart->tx_count;
 531
 532                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 533                         uart_write_wakeup(&uart->port);
 534
 535                 bfin_serial_dma_tx_chars(uart);
 536         }
 537
 538         spin_unlock(&uart->port.lock);
 539         return IRQ_HANDLED;
 540 }
 541
 542 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 543 {
 544         struct bfin_serial_port *uart = dev_id;
 545         unsigned short irqstat;
 546
 547         spin_lock(&uart->port.lock);
 548         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 549         clear_dma_irqstat(uart->rx_dma_channel);
 550         spin_unlock(&uart->port.lock);
 551
 552         mod_timer(&(uart->rx_dma_timer), jiffies);
 553
 554         return IRQ_HANDLED;
 555 }
 556 #endif
 557
 558 /*
 559  * Return TIOCSER_TEMT when transmitter is not busy.
 560  */
 561 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 562 {
 563         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 564         unsigned short lsr;
 565
 566         lsr = UART_GET_LSR(uart);
 567         if (lsr & TEMT)
 568                 return TIOCSER_TEMT;
 569         else
 570                 return 0;
 571 }
 572
 573 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 574 {
 575 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 576         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 577         if (uart->cts_pin < 0)
 578                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 579
 580 # ifdef BF54x
 581         if (UART_GET_MSR(uart) & CTS)
 582 # else
 583         if (gpio_get_value(uart->cts_pin))
 584 # endif
 585                 return TIOCM_DSR | TIOCM_CAR;
 586         else
 587 #endif
 588                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 589 }
 590
 591 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 592 {
 593 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 594         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 595         if (uart->rts_pin < 0)
 596                 return;
 597
 598         if (mctrl & TIOCM_RTS)
 599 # ifdef BF54x
 600                 UART_PUT_MCR(uart, UART_GET_MCR(uart) & ~MRTS);
 601 # else
 602                 gpio_set_value(uart->rts_pin, 0);
 603 # endif
 604         else
 605 # ifdef BF54x
 606                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | MRTS);
 607 # else
 608                 gpio_set_value(uart->rts_pin, 1);
 609 # endif
 610 #endif
 611 }
 612
 613 /*
 614  * Handle any change of modem status signal since we were last called.
 615  */
 616 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 617 {
 618 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 619         unsigned int status;
 620         struct uart_info *info = uart->port.info;
 621         struct tty_struct *tty = info->tty;
 622
 623         status = bfin_serial_get_mctrl(&uart->port);
 624         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 625         if (!(status & TIOCM_CTS)) {
 626                 tty->hw_stopped = 1;
 627                 schedule_work(&uart->cts_workqueue);
 628         } else {
 629                 tty->hw_stopped = 0;
 630         }
 631 #endif
 632 }
 633
 634 /*
 635  * Interrupts are always disabled.
 636  */
 637 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 638 {
 639         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 640         u16 lcr = UART_GET_LCR(uart);
 641         if (break_state)
 642                 lcr |= SB;
 643         else
 644                 lcr &= ~SB;
 645         UART_PUT_LCR(uart, lcr);
 646         SSYNC();
 647 }
 648
 649 static int bfin_serial_startup(struct uart_port *port)
 650 {
 651         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 652
 653 #ifdef CONFIG_SERIAL_BFIN_DMA
 654         dma_addr_t dma_handle;
 655
 656         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 657                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 658                 return -EBUSY;
 659         }
 660
 661         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 662                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 663                 free_dma(uart->rx_dma_channel);
 664                 return -EBUSY;
 665         }
 666
 667         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 668         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 669
 670         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 671         uart->rx_dma_buf.head = 0;
 672         uart->rx_dma_buf.tail = 0;
 673         uart->rx_dma_nrows = 0;
 674
 675         set_dma_config(uart->rx_dma_channel,
 676                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 677                                 INTR_ON_ROW, DIMENSION_2D,
 678                                 DATA_SIZE_8,
 679                                 DMA_SYNC_RESTART));
 680         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 681         set_dma_x_modify(uart->rx_dma_channel, 1);
 682         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 683         set_dma_y_modify(uart->rx_dma_channel, 1);
 684         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 685         enable_dma(uart->rx_dma_channel);
 686
 687         uart->rx_dma_timer.data = (unsigned long)(uart);
 688         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 689         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 690         add_timer(&(uart->rx_dma_timer));
 691 #else
 692         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 693              "BFIN_UART_RX", uart)) {
 694 # ifdef CONFIG_KGDB_UART
 695                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 696 # endif
 697                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 698                 return -EBUSY;
 699 # ifdef CONFIG_KGDB_UART
 700                 }
 701 # endif
 702         }
 703
 704
 705         if (request_irq
 706             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 707              "BFIN_UART_TX", uart)) {
 708                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 709                 free_irq(uart->port.irq, uart);
 710                 return -EBUSY;
 711         }
 712 #endif
 713 #ifdef CONFIG_BF54x
 714         UART_SET_IER(uart, ERBFI);
 715 #else
 716         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 717 #endif
 718         return 0;
 719 }
 720
 721 static void bfin_serial_shutdown(struct uart_port *port)
 722 {
 723         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 724
 725 #ifdef CONFIG_SERIAL_BFIN_DMA
 726         disable_dma(uart->tx_dma_channel);
 727         free_dma(uart->tx_dma_channel);
 728         disable_dma(uart->rx_dma_channel);
 729         free_dma(uart->rx_dma_channel);
 730         del_timer(&(uart->rx_dma_timer));
 731         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 732 #else
 733 #ifdef  CONFIG_KGDB_UART
 734         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 735 #endif
 736         free_irq(uart->port.irq, uart);
 737         free_irq(uart->port.irq+1, uart);
 738 #endif
 739 }
 740
 741 static void
 742 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 743                    struct ktermios *old)
 744 {
 745         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 746         unsigned long flags;
 747         unsigned int baud, quot;
 748         unsigned short val, ier, lcr = 0;
 749
 750         switch (termios->c_cflag & CSIZE) {
 751         case CS8:
 752                 lcr = WLS(8);
 753                 break;
 754         case CS7:
 755                 lcr = WLS(7);
 756                 break;
 757         case CS6:
 758                 lcr = WLS(6);
 759                 break;
 760         case CS5:
 761                 lcr = WLS(5);
 762                 break;
 763         default:
 764                 printk(KERN_ERR "%s: word lengh not supported\n",
 765                         __func__);
 766         }
 767
 768         if (termios->c_cflag & CSTOPB)
 769                 lcr |= STB;
 770         if (termios->c_cflag & PARENB)
 771                 lcr |= PEN;
 772         if (!(termios->c_cflag & PARODD))
 773                 lcr |= EPS;
 774         if (termios->c_cflag & CMSPAR)
 775                 lcr |= STP;
 776
 777         port->read_status_mask = OE;
 778         if (termios->c_iflag & INPCK)
 779                 port->read_status_mask |= (FE | PE);
 780         if (termios->c_iflag & (BRKINT | PARMRK))
 781                 port->read_status_mask |= BI;
 782
 783         /*
 784          * Characters to ignore
 785          */
 786         port->ignore_status_mask = 0;
 787         if (termios->c_iflag & IGNPAR)
 788                 port->ignore_status_mask |= FE | PE;
 789         if (termios->c_iflag & IGNBRK) {
 790                 port->ignore_status_mask |= BI;
 791                 /*
 792                  * If we're ignoring parity and break indicators,
 793                  * ignore overruns too (for real raw support).
 794                  */
 795                 if (termios->c_iflag & IGNPAR)
 796                         port->ignore_status_mask |= OE;
 797         }
 798
 799         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 800         quot = uart_get_divisor(port, baud);
 801         spin_lock_irqsave(&uart->port.lock, flags);
 802
 803         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 804
 805         /* Disable UART */
 806         ier = UART_GET_IER(uart);
 807 #ifdef CONFIG_BF54x
 808         UART_CLEAR_IER(uart, 0xF);
 809 #else
 810         UART_PUT_IER(uart, 0);
 811 #endif
 812
 813 #ifndef CONFIG_BF54x
 814         /* Set DLAB in LCR to Access DLL and DLH */
 815         val = UART_GET_LCR(uart);
 816         val |= DLAB;
 817         UART_PUT_LCR(uart, val);
 818         SSYNC();
 819 #endif
 820
 821         UART_PUT_DLL(uart, quot & 0xFF);
 822         SSYNC();
 823         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 824         SSYNC();
 825
 826 #ifndef CONFIG_BF54x
 827         /* Clear DLAB in LCR to Access THR RBR IER */
 828         val = UART_GET_LCR(uart);
 829         val &= ~DLAB;
 830         UART_PUT_LCR(uart, val);
 831         SSYNC();
 832 #endif
 833
 834         UART_PUT_LCR(uart, lcr);
 835
 836         /* Enable UART */
 837 #ifdef CONFIG_BF54x
 838         UART_SET_IER(uart, ier);
 839 #else
 840         UART_PUT_IER(uart, ier);
 841 #endif
 842
 843         val = UART_GET_GCTL(uart);
 844         val |= UCEN;
 845         UART_PUT_GCTL(uart, val);
 846
 847         spin_unlock_irqrestore(&uart->port.lock, flags);
 848 }
 849
 850 static const char *bfin_serial_type(struct uart_port *port)
 851 {
 852         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 853
 854         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 855 }
 856
 857 /*
 858  * Release the memory region(s) being used by 'port'.
 859  */
 860 static void bfin_serial_release_port(struct uart_port *port)
 861 {
 862 }
 863
 864 /*
 865  * Request the memory region(s) being used by 'port'.
 866  */
 867 static int bfin_serial_request_port(struct uart_port *port)
 868 {
 869         return 0;
 870 }
 871
 872 /*
 873  * Configure/autoconfigure the port.
 874  */
 875 static void bfin_serial_config_port(struct uart_port *port, int flags)
 876 {
 877         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 878
 879         if (flags & UART_CONFIG_TYPE &&
 880             bfin_serial_request_port(&uart->port) == 0)
 881                 uart->port.type = PORT_BFIN;
 882 }
 883
 884 /*
 885  * Verify the new serial_struct (for TIOCSSERIAL).
 886  * The only change we allow are to the flags and type, and
 887  * even then only between PORT_BFIN and PORT_UNKNOWN
 888  */
 889 static int
 890 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 891 {
 892         return 0;
 893 }
 894
 895 /*
 896  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 897  * In other cases, disable IrDA function.
 898  */
 899 static void bfin_set_ldisc(struct tty_struct *tty)
 900 {
 901         int line = tty->index;
 902         unsigned short val;
 903
 904         if (line >= tty->driver->num)
 905                 return;
 906
 907         switch (tty->ldisc.num) {
 908         case N_IRDA:
 909                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 910                 val |= (IREN | RPOLC);
 911                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 912                 break;
 913         default:
 914                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 915                 val &= ~(IREN | RPOLC);
 916                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 917         }
 918 }
 919
 920 static struct uart_ops bfin_serial_pops = {
 921         .tx_empty       = bfin_serial_tx_empty,
 922         .set_mctrl      = bfin_serial_set_mctrl,
 923         .get_mctrl      = bfin_serial_get_mctrl,
 924         .stop_tx        = bfin_serial_stop_tx,
 925         .start_tx       = bfin_serial_start_tx,
 926         .stop_rx        = bfin_serial_stop_rx,
 927         .enable_ms      = bfin_serial_enable_ms,
 928         .break_ctl      = bfin_serial_break_ctl,
 929         .startup        = bfin_serial_startup,
 930         .shutdown       = bfin_serial_shutdown,
 931         .set_termios    = bfin_serial_set_termios,
 932         .type           = bfin_serial_type,
 933         .release_port   = bfin_serial_release_port,
 934         .request_port   = bfin_serial_request_port,
 935         .config_port    = bfin_serial_config_port,
 936         .verify_port    = bfin_serial_verify_port,
 937 };
 938
 939 static void __init bfin_serial_init_ports(void)
 940 {
 941         static int first = 1;
 942         int i;
 943
 944         if (!first)
 945                 return;
 946         first = 0;
 947
 948         for (i = 0; i < nr_ports; i++) {
 949                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 950                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 951                 bfin_serial_ports[i].port.line      = i;
 952                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 953                 bfin_serial_ports[i].port.membase   =
 954                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 955                 bfin_serial_ports[i].port.mapbase   =
 956                         bfin_serial_resource[i].uart_base_addr;
 957                 bfin_serial_ports[i].port.irq       =
 958                         bfin_serial_resource[i].uart_irq;
 959                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 960 #ifdef CONFIG_SERIAL_BFIN_DMA
 961                 bfin_serial_ports[i].tx_done        = 1;
 962                 bfin_serial_ports[i].tx_count       = 0;
 963                 bfin_serial_ports[i].tx_dma_channel =
 964                         bfin_serial_resource[i].uart_tx_dma_channel;
 965                 bfin_serial_ports[i].rx_dma_channel =
 966                         bfin_serial_resource[i].uart_rx_dma_channel;
 967                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 968 #endif
 969 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 970                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 971                 bfin_serial_ports[i].cts_pin        =
 972                         bfin_serial_resource[i].uart_cts_pin;
 973                 bfin_serial_ports[i].rts_pin        =
 974                         bfin_serial_resource[i].uart_rts_pin;
 975 #endif
 976                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 977         }
 978
 979 }
 980
 981 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 982 /*
 983  * If the port was already initialised (eg, by a boot loader),
 984  * try to determine the current setup.
 985  */
 986 static void __init
 987 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 988                            int *parity, int *bits)
 989 {
 990         unsigned short status;
 991
 992         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 993         if (status == (ERBFI | ETBEI)) {
 994                 /* ok, the port was enabled */
 995                 unsigned short lcr, val;
 996                 unsigned short dlh, dll;
 997
 998                 lcr = UART_GET_LCR(uart);
 999
1000                 *parity = 'n';
1001                 if (lcr & PEN) {
1002                         if (lcr & EPS)
1003                                 *parity = 'e';
1004                         else
1005                                 *parity = 'o';
1006                 }
1007                 switch (lcr & 0x03) {
1008                         case 0: *bits = 5; break;
1009                         case 1: *bits = 6; break;
1010                         case 2: *bits = 7; break;
1011                         case 3: *bits = 8; break;
1012                 }
1013 #ifndef CONFIG_BF54x
1014                 /* Set DLAB in LCR to Access DLL and DLH */
1015                 val = UART_GET_LCR(uart);
1016                 val |= DLAB;
1017                 UART_PUT_LCR(uart, val);
1018 #endif
1019
1020                 dll = UART_GET_DLL(uart);
1021                 dlh = UART_GET_DLH(uart);
1022
1023 #ifndef CONFIG_BF54x
1024                 /* Clear DLAB in LCR to Access THR RBR IER */
1025                 val = UART_GET_LCR(uart);
1026                 val &= ~DLAB;
1027                 UART_PUT_LCR(uart, val);
1028 #endif
1029
1030                 *baud = get_sclk() / (16*(dll | dlh << 8));
1031         }
1032         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1033 }
1034 #endif
1035
1036 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1037 static struct uart_driver bfin_serial_reg;
1038
1039 static int __init
1040 bfin_serial_console_setup(struct console *co, char *options)
1041 {
1042         struct bfin_serial_port *uart;
1043 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1044         int baud = 57600;
1045         int bits = 8;
1046         int parity = 'n';
1047 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1048         int flow = 'r';
1049 #  else
1050         int flow = 'n';
1051 #  endif
1052 # endif
1053
1054         /*
1055          * Check whether an invalid uart number has been specified, and
1056          * if so, search for the first available port that does have
1057          * console support.
1058          */
1059         if (co->index == -1 || co->index >= nr_ports)
1060                 co->index = 0;
1061         uart = &bfin_serial_ports[co->index];
1062
1063 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
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 # else
1071         return 0;
1072 # endif
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         int flags = 0;
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 #ifdef CONFIG_KGDB_UART
1117         kgdb_entry_state = 0;
1118         init_kgdb_uart();
1119 #endif
1120         return 0;
1121 }
1122 console_initcall(bfin_serial_rs_console_init);
1123
1124 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1125 #else
1126 #define BFIN_SERIAL_CONSOLE     NULL
1127 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1128
1129
1130 #ifdef CONFIG_EARLY_PRINTK
1131 static __init void early_serial_putc(struct uart_port *port, int ch)
1132 {
1133         unsigned timeout = 0xffff;
1134         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1135
1136         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1137                 cpu_relax();
1138         UART_PUT_CHAR(uart, ch);
1139 }
1140
1141 static __init void early_serial_write(struct console *con, const char *s,
1142                                         unsigned int n)
1143 {
1144         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1145         unsigned int i;
1146
1147         for (i = 0; i < n; i++, s++) {
1148                 if (*s == '\n')
1149                         early_serial_putc(&uart->port, '\r');
1150                 early_serial_putc(&uart->port, *s);
1151         }
1152 }
1153
1154 static struct __init console bfin_early_serial_console = {
1155         .name = "early_BFuart",
1156         .write = early_serial_write,
1157         .device = uart_console_device,
1158         .flags = CON_PRINTBUFFER,
1159         .setup = bfin_serial_console_setup,
1160         .index = -1,
1161         .data  = &bfin_serial_reg,
1162 };
1163
1164 struct console __init *bfin_earlyserial_init(unsigned int port,
1165                                                 unsigned int cflag)
1166 {
1167         struct bfin_serial_port *uart;
1168         struct ktermios t;
1169
1170         if (port == -1 || port >= nr_ports)
1171                 port = 0;
1172         bfin_serial_init_ports();
1173         bfin_early_serial_console.index = port;
1174         uart = &bfin_serial_ports[port];
1175         t.c_cflag = cflag;
1176         t.c_iflag = 0;
1177         t.c_oflag = 0;
1178         t.c_lflag = ICANON;
1179         t.c_line = port;
1180         bfin_serial_set_termios(&uart->port, &t, &t);
1181         return &bfin_early_serial_console;
1182 }
1183
1184 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1185
1186 static struct uart_driver bfin_serial_reg = {
1187         .owner                  = THIS_MODULE,
1188         .driver_name            = "bfin-uart",
1189         .dev_name               = BFIN_SERIAL_NAME,
1190         .major                  = BFIN_SERIAL_MAJOR,
1191         .minor                  = BFIN_SERIAL_MINOR,
1192         .nr                     = BFIN_UART_NR_PORTS,
1193         .cons                   = BFIN_SERIAL_CONSOLE,
1194 };
1195
1196 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1197 {
1198         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1199
1200         if (uart)
1201                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1202
1203         return 0;
1204 }
1205
1206 static int bfin_serial_resume(struct platform_device *dev)
1207 {
1208         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1209
1210         if (uart)
1211                 uart_resume_port(&bfin_serial_reg, &uart->port);
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_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                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1232                 }
1233         }
1234
1235         return 0;
1236 }
1237
1238 static int bfin_serial_remove(struct platform_device *pdev)
1239 {
1240         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1241
1242
1243 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1244         gpio_free(uart->cts_pin);
1245         gpio_free(uart->rts_pin);
1246 #endif
1247
1248         platform_set_drvdata(pdev, NULL);
1249
1250         if (uart)
1251                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1252
1253         return 0;
1254 }
1255
1256 static struct platform_driver bfin_serial_driver = {
1257         .probe          = bfin_serial_probe,
1258         .remove         = bfin_serial_remove,
1259         .suspend        = bfin_serial_suspend,
1260         .resume         = bfin_serial_resume,
1261         .driver         = {
1262                 .name   = "bfin-uart",
1263                 .owner  = THIS_MODULE,
1264         },
1265 };
1266
1267 static int __init bfin_serial_init(void)
1268 {
1269         int ret;
1270 #ifdef CONFIG_KGDB_UART
1271         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1272         struct ktermios t;
1273 #endif
1274
1275         pr_info("Serial: Blackfin serial driver\n");
1276
1277         bfin_serial_init_ports();
1278
1279         ret = uart_register_driver(&bfin_serial_reg);
1280         if (ret == 0) {
1281                 bfin_serial_reg.tty_driver->set_ldisc = bfin_set_ldisc;
1282                 ret = platform_driver_register(&bfin_serial_driver);
1283                 if (ret) {
1284                         pr_debug("uart register failed\n");
1285                         uart_unregister_driver(&bfin_serial_reg);
1286                 }
1287         }
1288 #ifdef CONFIG_KGDB_UART
1289         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1290                 request_irq(uart->port.irq, bfin_serial_rx_int,
1291                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1292                 pr_info("Request irq for kgdb uart port\n");
1293 #ifdef CONFIG_BF54x
1294                 UART_SET_IER(uart, ERBFI);
1295 #else
1296                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1297 #endif
1298                 SSYNC();
1299                 t.c_cflag = CS8|B57600;
1300                 t.c_iflag = 0;
1301                 t.c_oflag = 0;
1302                 t.c_lflag = ICANON;
1303                 t.c_line = CONFIG_KGDB_UART_PORT;
1304                 bfin_serial_set_termios(&uart->port, &t, &t);
1305         }
1306 #endif
1307         return ret;
1308 }
1309
1310 static void __exit bfin_serial_exit(void)
1311 {
1312         platform_driver_unregister(&bfin_serial_driver);
1313         uart_unregister_driver(&bfin_serial_reg);
1314 }
1315
1316 module_init(bfin_serial_init);
1317 module_exit(bfin_serial_exit);
1318
1319 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1320 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1321 MODULE_LICENSE("GPL");
1322 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1323 MODULE_ALIAS("platform:bfin-uart");