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    5
  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 #if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
  68         unsigned short ier;
  69 #endif
  70
  71         while (!(UART_GET_LSR(uart) & TEMT))
  72                 continue;
  73
  74 #ifdef CONFIG_SERIAL_BFIN_DMA
  75         disable_dma(uart->tx_dma_channel);
  76 #else
  77 #ifdef CONFIG_BF54x
  78         /* Clear TFI bit */
  79         UART_PUT_LSR(uart, TFI);
  80         UART_CLEAR_IER(uart, ETBEI);
  81 #else
  82         ier = UART_GET_IER(uart);
  83         ier &= ~ETBEI;
  84         UART_PUT_IER(uart, ier);
  85 #endif
  86 #endif
  87 }
  88
  89 /*
  90  * port is locked and interrupts are disabled
  91  */
  92 static void bfin_serial_start_tx(struct uart_port *port)
  93 {
  94         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  95
  96 #ifdef CONFIG_SERIAL_BFIN_DMA
  97         bfin_serial_dma_tx_chars(uart);
  98 #else
  99 #ifdef CONFIG_BF54x
 100         UART_SET_IER(uart, ETBEI);
 101 #else
 102         unsigned short ier;
 103         ier = UART_GET_IER(uart);
 104         ier |= ETBEI;
 105         UART_PUT_IER(uart, ier);
 106 #endif
 107         bfin_serial_tx_chars(uart);
 108 #endif
 109 }
 110
 111 /*
 112  * Interrupts are enabled
 113  */
 114 static void bfin_serial_stop_rx(struct uart_port *port)
 115 {
 116         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 117 #ifdef  CONFIG_KGDB_UART
 118         if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 119 #endif
 120 #ifdef CONFIG_BF54x
 121         UART_CLEAR_IER(uart, ERBFI);
 122 #else
 123         unsigned short ier;
 124
 125         ier = UART_GET_IER(uart);
 126         ier &= ~ERBFI;
 127         UART_PUT_IER(uart, ier);
 128 #endif
 129 #ifdef  CONFIG_KGDB_UART
 130         }
 131 #endif
 132 }
 133
 134 /*
 135  * Set the modem control timer to fire immediately.
 136  */
 137 static void bfin_serial_enable_ms(struct uart_port *port)
 138 {
 139 }
 140
 141 #ifdef CONFIG_KGDB_UART
 142 static int kgdb_entry_state;
 143
 144 void kgdb_put_debug_char(int chr)
 145 {
 146         struct bfin_serial_port *uart;
 147
 148         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 149                 uart = &bfin_serial_ports[0];
 150         else
 151                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 152
 153         while (!(UART_GET_LSR(uart) & THRE)) {
 154                 SSYNC();
 155         }
 156
 157 #ifndef CONFIG_BF54x
 158         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 159         SSYNC();
 160 #endif
 161         UART_PUT_CHAR(uart, (unsigned char)chr);
 162         SSYNC();
 163 }
 164
 165 int kgdb_get_debug_char(void)
 166 {
 167         struct bfin_serial_port *uart;
 168         unsigned char chr;
 169
 170         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 171                 uart = &bfin_serial_ports[0];
 172         else
 173                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 174
 175         while(!(UART_GET_LSR(uart) & DR)) {
 176                 SSYNC();
 177         }
 178 #ifndef CONFIG_BF54x
 179         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 180         SSYNC();
 181 #endif
 182         chr = UART_GET_CHAR(uart);
 183         SSYNC();
 184
 185         return chr;
 186 }
 187 #endif
 188
 189 #if ANOMALY_05000230 && defined(CONFIG_SERIAL_BFIN_PIO)
 190 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 191 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 192 #else
 193 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 194 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 195 #endif
 196
 197 #ifdef CONFIG_SERIAL_BFIN_PIO
 198 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 199 {
 200         struct tty_struct *tty = uart->port.info->tty;
 201         unsigned int status, ch, flg;
 202         static struct timeval anomaly_start = { .tv_sec = 0 };
 203 #ifdef CONFIG_KGDB_UART
 204         struct pt_regs *regs = get_irq_regs();
 205 #endif
 206
 207         status = UART_GET_LSR(uart);
 208         UART_CLEAR_LSR(uart);
 209
 210         ch = UART_GET_CHAR(uart);
 211         uart->port.icount.rx++;
 212
 213 #ifdef CONFIG_KGDB_UART
 214         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
 215                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
 216                         kgdb_breakkey_pressed(regs);
 217                         return;
 218                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
 219                         kgdb_entry_state = 1;
 220                 } else if (kgdb_entry_state == 1 && ch == 'q') {
 221                         kgdb_entry_state = 0;
 222                         kgdb_breakkey_pressed(regs);
 223                         return;
 224                 } else if (ch == 0x3) {/* Ctrl + C */
 225                         kgdb_entry_state = 0;
 226                         kgdb_breakkey_pressed(regs);
 227                         return;
 228                 } else {
 229                         kgdb_entry_state = 0;
 230                 }
 231         }
 232 #endif
 233
 234         if (ANOMALY_05000230) {
 235                 /* The BF533 (and BF561) family of processors have a nice anomaly
 236                  * where they continuously generate characters for a "single" break.
 237                  * We have to basically ignore this flood until the "next" valid
 238                  * character comes across.  Due to the nature of the flood, it is
 239                  * not possible to reliably catch bytes that are sent too quickly
 240                  * after this break.  So application code talking to the Blackfin
 241                  * which sends a break signal must allow at least 1.5 character
 242                  * times after the end of the break for things to stabilize.  This
 243                  * timeout was picked as it must absolutely be larger than 1
 244                  * character time +/- some percent.  So 1.5 sounds good.  All other
 245                  * Blackfin families operate properly.  Woo.
 246                  * Note: While Anomaly 05000230 does not directly address this,
 247                  *       the changes that went in for it also fixed this issue.
 248                  *       That anomaly was fixed in 0.5+ silicon.  I like bunnies.
 249                  */
 250                 if (anomaly_start.tv_sec) {
 251                         struct timeval curr;
 252                         suseconds_t usecs;
 253
 254                         if ((~ch & (~ch + 1)) & 0xff)
 255                                 goto known_good_char;
 256
 257                         do_gettimeofday(&curr);
 258                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
 259                                 goto known_good_char;
 260
 261                         usecs = 0;
 262                         if (curr.tv_sec != anomaly_start.tv_sec)
 263                                 usecs += USEC_PER_SEC;
 264                         usecs += curr.tv_usec - anomaly_start.tv_usec;
 265
 266                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
 267                                 goto known_good_char;
 268
 269                         if (ch)
 270                                 anomaly_start.tv_sec = 0;
 271                         else
 272                                 anomaly_start = curr;
 273
 274                         return;
 275
 276  known_good_char:
 277                         anomaly_start.tv_sec = 0;
 278                 }
 279         }
 280
 281         if (status & BI) {
 282                 if (ANOMALY_05000230)
 283                         if (bfin_revid() < 5)
 284                                 do_gettimeofday(&anomaly_start);
 285                 uart->port.icount.brk++;
 286                 if (uart_handle_break(&uart->port))
 287                         goto ignore_char;
 288                 status &= ~(PE | FE);
 289         }
 290         if (status & PE)
 291                 uart->port.icount.parity++;
 292         if (status & OE)
 293                 uart->port.icount.overrun++;
 294         if (status & FE)
 295                 uart->port.icount.frame++;
 296
 297         status &= uart->port.read_status_mask;
 298
 299         if (status & BI)
 300                 flg = TTY_BREAK;
 301         else if (status & PE)
 302                 flg = TTY_PARITY;
 303         else if (status & FE)
 304                 flg = TTY_FRAME;
 305         else
 306                 flg = TTY_NORMAL;
 307
 308         if (uart_handle_sysrq_char(&uart->port, ch))
 309                 goto ignore_char;
 310
 311         uart_insert_char(&uart->port, status, OE, ch, flg);
 312
 313  ignore_char:
 314         tty_flip_buffer_push(tty);
 315 }
 316
 317 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 318 {
 319         struct circ_buf *xmit = &uart->port.info->xmit;
 320
 321         if (uart->port.x_char) {
 322                 UART_PUT_CHAR(uart, uart->port.x_char);
 323                 uart->port.icount.tx++;
 324                 uart->port.x_char = 0;
 325         }
 326         /*
 327          * Check the modem control lines before
 328          * transmitting anything.
 329          */
 330         bfin_serial_mctrl_check(uart);
 331
 332         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 333                 bfin_serial_stop_tx(&uart->port);
 334                 return;
 335         }
 336
 337         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 338                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 339                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 340                 uart->port.icount.tx++;
 341                 SSYNC();
 342         }
 343
 344         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 345                 uart_write_wakeup(&uart->port);
 346
 347         if (uart_circ_empty(xmit))
 348                 bfin_serial_stop_tx(&uart->port);
 349 }
 350
 351 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 352 {
 353         struct bfin_serial_port *uart = dev_id;
 354
 355         spin_lock(&uart->port.lock);
 356         while (UART_GET_LSR(uart) & DR)
 357                 bfin_serial_rx_chars(uart);
 358         spin_unlock(&uart->port.lock);
 359
 360         return IRQ_HANDLED;
 361 }
 362
 363 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 364 {
 365         struct bfin_serial_port *uart = dev_id;
 366
 367         spin_lock(&uart->port.lock);
 368         if (UART_GET_LSR(uart) & THRE)
 369                 bfin_serial_tx_chars(uart);
 370         spin_unlock(&uart->port.lock);
 371
 372         return IRQ_HANDLED;
 373 }
 374 #endif
 375
 376 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 377 static void bfin_serial_do_work(struct work_struct *work)
 378 {
 379         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 380
 381         bfin_serial_mctrl_check(uart);
 382 }
 383 #endif
 384
 385 #ifdef CONFIG_SERIAL_BFIN_DMA
 386 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 387 {
 388         struct circ_buf *xmit = &uart->port.info->xmit;
 389         unsigned short ier;
 390         int flags = 0;
 391
 392         if (!uart->tx_done)
 393                 return;
 394         uart->tx_done = 0;
 395
 396         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 397                 bfin_serial_stop_tx(&uart->port);
 398                 uart->tx_done = 1;
 399                 return;
 400         }
 401
 402         if (uart->port.x_char) {
 403                 UART_PUT_CHAR(uart, uart->port.x_char);
 404                 uart->port.icount.tx++;
 405                 uart->port.x_char = 0;
 406         }
 407
 408         /*
 409          * Check the modem control lines before
 410          * transmitting anything.
 411          */
 412         bfin_serial_mctrl_check(uart);
 413
 414         spin_lock_irqsave(&uart->port.lock, flags);
 415         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 416         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 417                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 418         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 419                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 420         set_dma_config(uart->tx_dma_channel,
 421                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 422                         INTR_ON_BUF,
 423                         DIMENSION_LINEAR,
 424                         DATA_SIZE_8,
 425                         DMA_SYNC_RESTART));
 426         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 427         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 428         set_dma_x_modify(uart->tx_dma_channel, 1);
 429         enable_dma(uart->tx_dma_channel);
 430
 431         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 432         uart->port.icount.tx += uart->tx_count;
 433
 434 #ifdef CONFIG_BF54x
 435         UART_SET_IER(uart, ETBEI);
 436 #else
 437         ier = UART_GET_IER(uart);
 438         ier |= ETBEI;
 439         UART_PUT_IER(uart, ier);
 440 #endif
 441         spin_unlock_irqrestore(&uart->port.lock, flags);
 442 }
 443
 444 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 445 {
 446         struct tty_struct *tty = uart->port.info->tty;
 447         int i, flg, status;
 448
 449         status = UART_GET_LSR(uart);
 450         UART_CLEAR_LSR(uart);
 451
 452         uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
 453
 454         if (status & BI) {
 455                 uart->port.icount.brk++;
 456                 if (uart_handle_break(&uart->port))
 457                         goto dma_ignore_char;
 458                 status &= ~(PE | FE);
 459         }
 460         if (status & PE)
 461                 uart->port.icount.parity++;
 462         if (status & OE)
 463                 uart->port.icount.overrun++;
 464         if (status & FE)
 465                 uart->port.icount.frame++;
 466
 467         status &= uart->port.read_status_mask;
 468
 469         if (status & BI)
 470                 flg = TTY_BREAK;
 471         else if (status & PE)
 472                 flg = TTY_PARITY;
 473         else if (status & FE)
 474                 flg = TTY_FRAME;
 475         else
 476                 flg = TTY_NORMAL;
 477
 478         for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
 479                 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 480                         goto dma_ignore_char;
 481                 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
 482         }
 483
 484  dma_ignore_char:
 485         tty_flip_buffer_push(tty);
 486 }
 487
 488 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 489 {
 490         int x_pos, pos;
 491         int flags = 0;
 492
 493         spin_lock_irqsave(&uart->port.lock, flags);
 494         x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
 495         if (x_pos == DMA_RX_XCOUNT)
 496                 x_pos = 0;
 497
 498         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 499
 500         if (pos>uart->rx_dma_buf.tail) {
 501                 uart->rx_dma_buf.tail = pos;
 502                 bfin_serial_dma_rx_chars(uart);
 503                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 504         }
 505         spin_unlock_irqrestore(&uart->port.lock, flags);
 506         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 507         add_timer(&(uart->rx_dma_timer));
 508 }
 509
 510 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 511 {
 512         struct bfin_serial_port *uart = dev_id;
 513         struct circ_buf *xmit = &uart->port.info->xmit;
 514         unsigned short ier;
 515
 516         spin_lock(&uart->port.lock);
 517         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 518                 clear_dma_irqstat(uart->tx_dma_channel);
 519                 disable_dma(uart->tx_dma_channel);
 520 #ifdef CONFIG_BF54x
 521                 UART_CLEAR_IER(uart, ETBEI);
 522 #else
 523                 ier = UART_GET_IER(uart);
 524                 ier &= ~ETBEI;
 525                 UART_PUT_IER(uart, ier);
 526 #endif
 527                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 528                         uart_write_wakeup(&uart->port);
 529
 530                 uart->tx_done = 1;
 531
 532                 bfin_serial_dma_tx_chars(uart);
 533         }
 534
 535         spin_unlock(&uart->port.lock);
 536         return IRQ_HANDLED;
 537 }
 538
 539 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 540 {
 541         struct bfin_serial_port *uart = dev_id;
 542         unsigned short irqstat;
 543
 544         uart->rx_dma_nrows++;
 545         if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
 546                 uart->rx_dma_nrows = 0;
 547                 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
 548                 bfin_serial_dma_rx_chars(uart);
 549                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
 550         }
 551         spin_lock(&uart->port.lock);
 552         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 553         clear_dma_irqstat(uart->rx_dma_channel);
 554
 555         spin_unlock(&uart->port.lock);
 556         return IRQ_HANDLED;
 557 }
 558 #endif
 559
 560 /*
 561  * Return TIOCSER_TEMT when transmitter is not busy.
 562  */
 563 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 564 {
 565         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 566         unsigned short lsr;
 567
 568         lsr = UART_GET_LSR(uart);
 569         if (lsr & TEMT)
 570                 return TIOCSER_TEMT;
 571         else
 572                 return 0;
 573 }
 574
 575 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 576 {
 577 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 578         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 579         if (uart->cts_pin < 0)
 580                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 581
 582         if (gpio_get_value(uart->cts_pin))
 583                 return TIOCM_DSR | TIOCM_CAR;
 584         else
 585 #endif
 586                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 587 }
 588
 589 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 590 {
 591 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 592         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 593         if (uart->rts_pin < 0)
 594                 return;
 595
 596         if (mctrl & TIOCM_RTS)
 597                 gpio_set_value(uart->rts_pin, 0);
 598         else
 599                 gpio_set_value(uart->rts_pin, 1);
 600 #endif
 601 }
 602
 603 /*
 604  * Handle any change of modem status signal since we were last called.
 605  */
 606 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 607 {
 608 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 609         unsigned int status;
 610         struct uart_info *info = uart->port.info;
 611         struct tty_struct *tty = info->tty;
 612
 613         status = bfin_serial_get_mctrl(&uart->port);
 614         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 615         if (!(status & TIOCM_CTS)) {
 616                 tty->hw_stopped = 1;
 617                 schedule_work(&uart->cts_workqueue);
 618         } else {
 619                 tty->hw_stopped = 0;
 620         }
 621 #endif
 622 }
 623
 624 /*
 625  * Interrupts are always disabled.
 626  */
 627 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 628 {
 629         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 630         u16 lcr = UART_GET_LCR(uart);
 631         if (break_state)
 632                 lcr |= SB;
 633         else
 634                 lcr &= ~SB;
 635         UART_PUT_LCR(uart, lcr);
 636         SSYNC();
 637 }
 638
 639 static int bfin_serial_startup(struct uart_port *port)
 640 {
 641         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 642
 643 #ifdef CONFIG_SERIAL_BFIN_DMA
 644         dma_addr_t dma_handle;
 645
 646         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 647                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 648                 return -EBUSY;
 649         }
 650
 651         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 652                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 653                 free_dma(uart->rx_dma_channel);
 654                 return -EBUSY;
 655         }
 656
 657         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 658         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 659
 660         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 661         uart->rx_dma_buf.head = 0;
 662         uart->rx_dma_buf.tail = 0;
 663         uart->rx_dma_nrows = 0;
 664
 665         set_dma_config(uart->rx_dma_channel,
 666                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 667                                 INTR_ON_ROW, DIMENSION_2D,
 668                                 DATA_SIZE_8,
 669                                 DMA_SYNC_RESTART));
 670         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 671         set_dma_x_modify(uart->rx_dma_channel, 1);
 672         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 673         set_dma_y_modify(uart->rx_dma_channel, 1);
 674         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 675         enable_dma(uart->rx_dma_channel);
 676
 677         uart->rx_dma_timer.data = (unsigned long)(uart);
 678         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 679         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 680         add_timer(&(uart->rx_dma_timer));
 681 #else
 682         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 683              "BFIN_UART_RX", uart)) {
 684 # ifdef CONFIG_KGDB_UART
 685                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 686 # endif
 687                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 688                 return -EBUSY;
 689 # ifdef CONFIG_KGDB_UART
 690                 }
 691 # endif
 692         }
 693
 694
 695         if (request_irq
 696             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 697              "BFIN_UART_TX", uart)) {
 698                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 699                 free_irq(uart->port.irq, uart);
 700                 return -EBUSY;
 701         }
 702 #endif
 703 #ifdef CONFIG_BF54x
 704         UART_SET_IER(uart, ERBFI);
 705 #else
 706         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 707 #endif
 708         return 0;
 709 }
 710
 711 static void bfin_serial_shutdown(struct uart_port *port)
 712 {
 713         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 714
 715 #ifdef CONFIG_SERIAL_BFIN_DMA
 716         disable_dma(uart->tx_dma_channel);
 717         free_dma(uart->tx_dma_channel);
 718         disable_dma(uart->rx_dma_channel);
 719         free_dma(uart->rx_dma_channel);
 720         del_timer(&(uart->rx_dma_timer));
 721         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 722 #else
 723 #ifdef  CONFIG_KGDB_UART
 724         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 725 #endif
 726         free_irq(uart->port.irq, uart);
 727         free_irq(uart->port.irq+1, uart);
 728 #endif
 729 }
 730
 731 static void
 732 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 733                    struct ktermios *old)
 734 {
 735         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 736         unsigned long flags;
 737         unsigned int baud, quot;
 738         unsigned short val, ier, lsr, lcr = 0;
 739
 740         switch (termios->c_cflag & CSIZE) {
 741         case CS8:
 742                 lcr = WLS(8);
 743                 break;
 744         case CS7:
 745                 lcr = WLS(7);
 746                 break;
 747         case CS6:
 748                 lcr = WLS(6);
 749                 break;
 750         case CS5:
 751                 lcr = WLS(5);
 752                 break;
 753         default:
 754                 printk(KERN_ERR "%s: word lengh not supported\n",
 755                         __FUNCTION__);
 756         }
 757
 758         if (termios->c_cflag & CSTOPB)
 759                 lcr |= STB;
 760         if (termios->c_cflag & PARENB)
 761                 lcr |= PEN;
 762         if (!(termios->c_cflag & PARODD))
 763                 lcr |= EPS;
 764         if (termios->c_cflag & CMSPAR)
 765                 lcr |= STP;
 766
 767         port->read_status_mask = OE;
 768         if (termios->c_iflag & INPCK)
 769                 port->read_status_mask |= (FE | PE);
 770         if (termios->c_iflag & (BRKINT | PARMRK))
 771                 port->read_status_mask |= BI;
 772
 773         /*
 774          * Characters to ignore
 775          */
 776         port->ignore_status_mask = 0;
 777         if (termios->c_iflag & IGNPAR)
 778                 port->ignore_status_mask |= FE | PE;
 779         if (termios->c_iflag & IGNBRK) {
 780                 port->ignore_status_mask |= BI;
 781                 /*
 782                  * If we're ignoring parity and break indicators,
 783                  * ignore overruns too (for real raw support).
 784                  */
 785                 if (termios->c_iflag & IGNPAR)
 786                         port->ignore_status_mask |= OE;
 787         }
 788
 789         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 790         quot = uart_get_divisor(port, baud);
 791         spin_lock_irqsave(&uart->port.lock, flags);
 792
 793         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 794
 795         do {
 796                 lsr = UART_GET_LSR(uart);
 797         } while (!(lsr & TEMT));
 798
 799         /* Disable UART */
 800         ier = UART_GET_IER(uart);
 801 #ifdef CONFIG_BF54x
 802         UART_CLEAR_IER(uart, 0xF);
 803 #else
 804         UART_PUT_IER(uart, 0);
 805 #endif
 806
 807 #ifndef CONFIG_BF54x
 808         /* Set DLAB in LCR to Access DLL and DLH */
 809         val = UART_GET_LCR(uart);
 810         val |= DLAB;
 811         UART_PUT_LCR(uart, val);
 812         SSYNC();
 813 #endif
 814
 815         UART_PUT_DLL(uart, quot & 0xFF);
 816         SSYNC();
 817         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 818         SSYNC();
 819
 820 #ifndef CONFIG_BF54x
 821         /* Clear DLAB in LCR to Access THR RBR IER */
 822         val = UART_GET_LCR(uart);
 823         val &= ~DLAB;
 824         UART_PUT_LCR(uart, val);
 825         SSYNC();
 826 #endif
 827
 828         UART_PUT_LCR(uart, lcr);
 829
 830         /* Enable UART */
 831 #ifdef CONFIG_BF54x
 832         UART_SET_IER(uart, ier);
 833 #else
 834         UART_PUT_IER(uart, ier);
 835 #endif
 836
 837         val = UART_GET_GCTL(uart);
 838         val |= UCEN;
 839         UART_PUT_GCTL(uart, val);
 840
 841         spin_unlock_irqrestore(&uart->port.lock, flags);
 842 }
 843
 844 static const char *bfin_serial_type(struct uart_port *port)
 845 {
 846         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 847
 848         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 849 }
 850
 851 /*
 852  * Release the memory region(s) being used by 'port'.
 853  */
 854 static void bfin_serial_release_port(struct uart_port *port)
 855 {
 856 }
 857
 858 /*
 859  * Request the memory region(s) being used by 'port'.
 860  */
 861 static int bfin_serial_request_port(struct uart_port *port)
 862 {
 863         return 0;
 864 }
 865
 866 /*
 867  * Configure/autoconfigure the port.
 868  */
 869 static void bfin_serial_config_port(struct uart_port *port, int flags)
 870 {
 871         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 872
 873         if (flags & UART_CONFIG_TYPE &&
 874             bfin_serial_request_port(&uart->port) == 0)
 875                 uart->port.type = PORT_BFIN;
 876 }
 877
 878 /*
 879  * Verify the new serial_struct (for TIOCSSERIAL).
 880  * The only change we allow are to the flags and type, and
 881  * even then only between PORT_BFIN and PORT_UNKNOWN
 882  */
 883 static int
 884 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 885 {
 886         return 0;
 887 }
 888
 889 static struct uart_ops bfin_serial_pops = {
 890         .tx_empty       = bfin_serial_tx_empty,
 891         .set_mctrl      = bfin_serial_set_mctrl,
 892         .get_mctrl      = bfin_serial_get_mctrl,
 893         .stop_tx        = bfin_serial_stop_tx,
 894         .start_tx       = bfin_serial_start_tx,
 895         .stop_rx        = bfin_serial_stop_rx,
 896         .enable_ms      = bfin_serial_enable_ms,
 897         .break_ctl      = bfin_serial_break_ctl,
 898         .startup        = bfin_serial_startup,
 899         .shutdown       = bfin_serial_shutdown,
 900         .set_termios    = bfin_serial_set_termios,
 901         .type           = bfin_serial_type,
 902         .release_port   = bfin_serial_release_port,
 903         .request_port   = bfin_serial_request_port,
 904         .config_port    = bfin_serial_config_port,
 905         .verify_port    = bfin_serial_verify_port,
 906 };
 907
 908 static void __init bfin_serial_init_ports(void)
 909 {
 910         static int first = 1;
 911         int i;
 912
 913         if (!first)
 914                 return;
 915         first = 0;
 916
 917         for (i = 0; i < nr_ports; i++) {
 918                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 919                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 920                 bfin_serial_ports[i].port.line      = i;
 921                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 922                 bfin_serial_ports[i].port.membase   =
 923                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 924                 bfin_serial_ports[i].port.mapbase   =
 925                         bfin_serial_resource[i].uart_base_addr;
 926                 bfin_serial_ports[i].port.irq       =
 927                         bfin_serial_resource[i].uart_irq;
 928                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 929 #ifdef CONFIG_SERIAL_BFIN_DMA
 930                 bfin_serial_ports[i].tx_done        = 1;
 931                 bfin_serial_ports[i].tx_count       = 0;
 932                 bfin_serial_ports[i].tx_dma_channel =
 933                         bfin_serial_resource[i].uart_tx_dma_channel;
 934                 bfin_serial_ports[i].rx_dma_channel =
 935                         bfin_serial_resource[i].uart_rx_dma_channel;
 936                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 937 #endif
 938 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 939                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 940                 bfin_serial_ports[i].cts_pin        =
 941                         bfin_serial_resource[i].uart_cts_pin;
 942                 bfin_serial_ports[i].rts_pin        =
 943                         bfin_serial_resource[i].uart_rts_pin;
 944 #endif
 945                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 946         }
 947
 948 }
 949
 950 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 951 /*
 952  * If the port was already initialised (eg, by a boot loader),
 953  * try to determine the current setup.
 954  */
 955 static void __init
 956 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 957                            int *parity, int *bits)
 958 {
 959         unsigned short status;
 960
 961         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 962         if (status == (ERBFI | ETBEI)) {
 963                 /* ok, the port was enabled */
 964                 unsigned short lcr, val;
 965                 unsigned short dlh, dll;
 966
 967                 lcr = UART_GET_LCR(uart);
 968
 969                 *parity = 'n';
 970                 if (lcr & PEN) {
 971                         if (lcr & EPS)
 972                                 *parity = 'e';
 973                         else
 974                                 *parity = 'o';
 975                 }
 976                 switch (lcr & 0x03) {
 977                         case 0: *bits = 5; break;
 978                         case 1: *bits = 6; break;
 979                         case 2: *bits = 7; break;
 980                         case 3: *bits = 8; break;
 981                 }
 982 #ifndef CONFIG_BF54x
 983                 /* Set DLAB in LCR to Access DLL and DLH */
 984                 val = UART_GET_LCR(uart);
 985                 val |= DLAB;
 986                 UART_PUT_LCR(uart, val);
 987 #endif
 988
 989                 dll = UART_GET_DLL(uart);
 990                 dlh = UART_GET_DLH(uart);
 991
 992 #ifndef CONFIG_BF54x
 993                 /* Clear DLAB in LCR to Access THR RBR IER */
 994                 val = UART_GET_LCR(uart);
 995                 val &= ~DLAB;
 996                 UART_PUT_LCR(uart, val);
 997 #endif
 998
 999                 *baud = get_sclk() / (16*(dll | dlh << 8));
1000         }
1001         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1002 }
1003 #endif
1004
1005 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1006 static struct uart_driver bfin_serial_reg;
1007
1008 static int __init
1009 bfin_serial_console_setup(struct console *co, char *options)
1010 {
1011         struct bfin_serial_port *uart;
1012 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1013         int baud = 57600;
1014         int bits = 8;
1015         int parity = 'n';
1016 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1017         int flow = 'r';
1018 #  else
1019         int flow = 'n';
1020 #  endif
1021 # endif
1022
1023         /*
1024          * Check whether an invalid uart number has been specified, and
1025          * if so, search for the first available port that does have
1026          * console support.
1027          */
1028         if (co->index == -1 || co->index >= nr_ports)
1029                 co->index = 0;
1030         uart = &bfin_serial_ports[co->index];
1031
1032 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1033         if (options)
1034                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1035         else
1036                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1037
1038         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1039 # else
1040         return 0;
1041 # endif
1042 }
1043 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1044                                  defined (CONFIG_EARLY_PRINTK) */
1045
1046 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1047 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1048 {
1049         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1050         while (!(UART_GET_LSR(uart) & THRE))
1051                 barrier();
1052         UART_PUT_CHAR(uart, ch);
1053         SSYNC();
1054 }
1055
1056 /*
1057  * Interrupts are disabled on entering
1058  */
1059 static void
1060 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1061 {
1062         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1063         int flags = 0;
1064
1065         spin_lock_irqsave(&uart->port.lock, flags);
1066         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1067         spin_unlock_irqrestore(&uart->port.lock, flags);
1068
1069 }
1070
1071 static struct console bfin_serial_console = {
1072         .name           = BFIN_SERIAL_NAME,
1073         .write          = bfin_serial_console_write,
1074         .device         = uart_console_device,
1075         .setup          = bfin_serial_console_setup,
1076         .flags          = CON_PRINTBUFFER,
1077         .index          = -1,
1078         .data           = &bfin_serial_reg,
1079 };
1080
1081 static int __init bfin_serial_rs_console_init(void)
1082 {
1083         bfin_serial_init_ports();
1084         register_console(&bfin_serial_console);
1085 #ifdef CONFIG_KGDB_UART
1086         kgdb_entry_state = 0;
1087         init_kgdb_uart();
1088 #endif
1089         return 0;
1090 }
1091 console_initcall(bfin_serial_rs_console_init);
1092
1093 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1094 #else
1095 #define BFIN_SERIAL_CONSOLE     NULL
1096 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1097
1098
1099 #ifdef CONFIG_EARLY_PRINTK
1100 static __init void early_serial_putc(struct uart_port *port, int ch)
1101 {
1102         unsigned timeout = 0xffff;
1103         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1104
1105         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1106                 cpu_relax();
1107         UART_PUT_CHAR(uart, ch);
1108 }
1109
1110 static __init void early_serial_write(struct console *con, const char *s,
1111                                         unsigned int n)
1112 {
1113         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1114         unsigned int i;
1115
1116         for (i = 0; i < n; i++, s++) {
1117                 if (*s == '\n')
1118                         early_serial_putc(&uart->port, '\r');
1119                 early_serial_putc(&uart->port, *s);
1120         }
1121 }
1122
1123 static struct __init console bfin_early_serial_console = {
1124         .name = "early_BFuart",
1125         .write = early_serial_write,
1126         .device = uart_console_device,
1127         .flags = CON_PRINTBUFFER,
1128         .setup = bfin_serial_console_setup,
1129         .index = -1,
1130         .data  = &bfin_serial_reg,
1131 };
1132
1133 struct console __init *bfin_earlyserial_init(unsigned int port,
1134                                                 unsigned int cflag)
1135 {
1136         struct bfin_serial_port *uart;
1137         struct ktermios t;
1138
1139         if (port == -1 || port >= nr_ports)
1140                 port = 0;
1141         bfin_serial_init_ports();
1142         bfin_early_serial_console.index = port;
1143         uart = &bfin_serial_ports[port];
1144         t.c_cflag = cflag;
1145         t.c_iflag = 0;
1146         t.c_oflag = 0;
1147         t.c_lflag = ICANON;
1148         t.c_line = port;
1149         bfin_serial_set_termios(&uart->port, &t, &t);
1150         return &bfin_early_serial_console;
1151 }
1152
1153 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1154
1155 static struct uart_driver bfin_serial_reg = {
1156         .owner                  = THIS_MODULE,
1157         .driver_name            = "bfin-uart",
1158         .dev_name               = BFIN_SERIAL_NAME,
1159         .major                  = BFIN_SERIAL_MAJOR,
1160         .minor                  = BFIN_SERIAL_MINOR,
1161         .nr                     = NR_PORTS,
1162         .cons                   = BFIN_SERIAL_CONSOLE,
1163 };
1164
1165 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1166 {
1167         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1168
1169         if (uart)
1170                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1171
1172         return 0;
1173 }
1174
1175 static int bfin_serial_resume(struct platform_device *dev)
1176 {
1177         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1178
1179         if (uart)
1180                 uart_resume_port(&bfin_serial_reg, &uart->port);
1181
1182         return 0;
1183 }
1184
1185 static int bfin_serial_probe(struct platform_device *dev)
1186 {
1187         struct resource *res = dev->resource;
1188         int i;
1189
1190         for (i = 0; i < dev->num_resources; i++, res++)
1191                 if (res->flags & IORESOURCE_MEM)
1192                         break;
1193
1194         if (i < dev->num_resources) {
1195                 for (i = 0; i < nr_ports; i++, res++) {
1196                         if (bfin_serial_ports[i].port.mapbase != res->start)
1197                                 continue;
1198                         bfin_serial_ports[i].port.dev = &dev->dev;
1199                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1200                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1201                 }
1202         }
1203
1204         return 0;
1205 }
1206
1207 static int bfin_serial_remove(struct platform_device *pdev)
1208 {
1209         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1210
1211
1212 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1213         gpio_free(uart->cts_pin);
1214         gpio_free(uart->rts_pin);
1215 #endif
1216
1217         platform_set_drvdata(pdev, NULL);
1218
1219         if (uart)
1220                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1221
1222         return 0;
1223 }
1224
1225 static struct platform_driver bfin_serial_driver = {
1226         .probe          = bfin_serial_probe,
1227         .remove         = bfin_serial_remove,
1228         .suspend        = bfin_serial_suspend,
1229         .resume         = bfin_serial_resume,
1230         .driver         = {
1231                 .name   = "bfin-uart",
1232         },
1233 };
1234
1235 static int __init bfin_serial_init(void)
1236 {
1237         int ret;
1238 #ifdef CONFIG_KGDB_UART
1239         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1240         struct ktermios t;
1241 #endif
1242
1243         pr_info("Serial: Blackfin serial driver\n");
1244
1245         bfin_serial_init_ports();
1246
1247         ret = uart_register_driver(&bfin_serial_reg);
1248         if (ret == 0) {
1249                 ret = platform_driver_register(&bfin_serial_driver);
1250                 if (ret) {
1251                         pr_debug("uart register failed\n");
1252                         uart_unregister_driver(&bfin_serial_reg);
1253                 }
1254         }
1255 #ifdef CONFIG_KGDB_UART
1256         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1257                 request_irq(uart->port.irq, bfin_serial_rx_int,
1258                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1259                 pr_info("Request irq for kgdb uart port\n");
1260 #ifdef CONFIG_BF54x
1261                 UART_SET_IER(uart, ERBFI);
1262 #else
1263                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1264 #endif
1265                 SSYNC();
1266                 t.c_cflag = CS8|B57600;
1267                 t.c_iflag = 0;
1268                 t.c_oflag = 0;
1269                 t.c_lflag = ICANON;
1270                 t.c_line = CONFIG_KGDB_UART_PORT;
1271                 bfin_serial_set_termios(&uart->port, &t, &t);
1272         }
1273 #endif
1274         return ret;
1275 }
1276
1277 static void __exit bfin_serial_exit(void)
1278 {
1279         platform_driver_unregister(&bfin_serial_driver);
1280         uart_unregister_driver(&bfin_serial_reg);
1281 }
1282
1283 module_init(bfin_serial_init);
1284 module_exit(bfin_serial_exit);
1285
1286 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1287 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1288 MODULE_LICENSE("GPL");
1289 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);