SAFE public projects git trees. - safe/jmp/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    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 # ifdef BF54x
 583         if (UART_GET_MSR(uart) & CTS)
 584 # else
 585         if (gpio_get_value(uart->cts_pin))
 586 # endif
 587                 return TIOCM_DSR | TIOCM_CAR;
 588         else
 589 #endif
 590                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 591 }
 592
 593 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 594 {
 595 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 596         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 597         if (uart->rts_pin < 0)
 598                 return;
 599
 600         if (mctrl & TIOCM_RTS)
 601 # ifdef BF54x
 602                 UART_PUT_MCR(uart, UART_GET_MCR(uart) & ~MRTS);
 603 # else
 604                 gpio_set_value(uart->rts_pin, 0);
 605 # endif
 606         else
 607 # ifdef BF54x
 608                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | MRTS);
 609 # else
 610                 gpio_set_value(uart->rts_pin, 1);
 611 # endif
 612 #endif
 613 }
 614
 615 /*
 616  * Handle any change of modem status signal since we were last called.
 617  */
 618 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 619 {
 620 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 621         unsigned int status;
 622         struct uart_info *info = uart->port.info;
 623         struct tty_struct *tty = info->tty;
 624
 625         status = bfin_serial_get_mctrl(&uart->port);
 626         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 627         if (!(status & TIOCM_CTS)) {
 628                 tty->hw_stopped = 1;
 629                 schedule_work(&uart->cts_workqueue);
 630         } else {
 631                 tty->hw_stopped = 0;
 632         }
 633 #endif
 634 }
 635
 636 /*
 637  * Interrupts are always disabled.
 638  */
 639 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 640 {
 641         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 642         u16 lcr = UART_GET_LCR(uart);
 643         if (break_state)
 644                 lcr |= SB;
 645         else
 646                 lcr &= ~SB;
 647         UART_PUT_LCR(uart, lcr);
 648         SSYNC();
 649 }
 650
 651 static int bfin_serial_startup(struct uart_port *port)
 652 {
 653         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 654
 655 #ifdef CONFIG_SERIAL_BFIN_DMA
 656         dma_addr_t dma_handle;
 657
 658         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 659                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 660                 return -EBUSY;
 661         }
 662
 663         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 664                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 665                 free_dma(uart->rx_dma_channel);
 666                 return -EBUSY;
 667         }
 668
 669         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 670         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 671
 672         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 673         uart->rx_dma_buf.head = 0;
 674         uart->rx_dma_buf.tail = 0;
 675         uart->rx_dma_nrows = 0;
 676
 677         set_dma_config(uart->rx_dma_channel,
 678                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 679                                 INTR_ON_ROW, DIMENSION_2D,
 680                                 DATA_SIZE_8,
 681                                 DMA_SYNC_RESTART));
 682         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 683         set_dma_x_modify(uart->rx_dma_channel, 1);
 684         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 685         set_dma_y_modify(uart->rx_dma_channel, 1);
 686         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 687         enable_dma(uart->rx_dma_channel);
 688
 689         uart->rx_dma_timer.data = (unsigned long)(uart);
 690         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 691         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 692         add_timer(&(uart->rx_dma_timer));
 693 #else
 694         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 695              "BFIN_UART_RX", uart)) {
 696 # ifdef CONFIG_KGDB_UART
 697                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 698 # endif
 699                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 700                 return -EBUSY;
 701 # ifdef CONFIG_KGDB_UART
 702                 }
 703 # endif
 704         }
 705
 706
 707         if (request_irq
 708             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 709              "BFIN_UART_TX", uart)) {
 710                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 711                 free_irq(uart->port.irq, uart);
 712                 return -EBUSY;
 713         }
 714 #endif
 715 #ifdef CONFIG_BF54x
 716         UART_SET_IER(uart, ERBFI);
 717 #else
 718         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 719 #endif
 720         return 0;
 721 }
 722
 723 static void bfin_serial_shutdown(struct uart_port *port)
 724 {
 725         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 726
 727 #ifdef CONFIG_SERIAL_BFIN_DMA
 728         disable_dma(uart->tx_dma_channel);
 729         free_dma(uart->tx_dma_channel);
 730         disable_dma(uart->rx_dma_channel);
 731         free_dma(uart->rx_dma_channel);
 732         del_timer(&(uart->rx_dma_timer));
 733         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 734 #else
 735 #ifdef  CONFIG_KGDB_UART
 736         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 737 #endif
 738         free_irq(uart->port.irq, uart);
 739         free_irq(uart->port.irq+1, uart);
 740 #endif
 741 }
 742
 743 static void
 744 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 745                    struct ktermios *old)
 746 {
 747         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 748         unsigned long flags;
 749         unsigned int baud, quot;
 750         unsigned short val, ier, lsr, lcr = 0;
 751
 752         switch (termios->c_cflag & CSIZE) {
 753         case CS8:
 754                 lcr = WLS(8);
 755                 break;
 756         case CS7:
 757                 lcr = WLS(7);
 758                 break;
 759         case CS6:
 760                 lcr = WLS(6);
 761                 break;
 762         case CS5:
 763                 lcr = WLS(5);
 764                 break;
 765         default:
 766                 printk(KERN_ERR "%s: word lengh not supported\n",
 767                         __FUNCTION__);
 768         }
 769
 770         if (termios->c_cflag & CSTOPB)
 771                 lcr |= STB;
 772         if (termios->c_cflag & PARENB)
 773                 lcr |= PEN;
 774         if (!(termios->c_cflag & PARODD))
 775                 lcr |= EPS;
 776         if (termios->c_cflag & CMSPAR)
 777                 lcr |= STP;
 778
 779         port->read_status_mask = OE;
 780         if (termios->c_iflag & INPCK)
 781                 port->read_status_mask |= (FE | PE);
 782         if (termios->c_iflag & (BRKINT | PARMRK))
 783                 port->read_status_mask |= BI;
 784
 785         /*
 786          * Characters to ignore
 787          */
 788         port->ignore_status_mask = 0;
 789         if (termios->c_iflag & IGNPAR)
 790                 port->ignore_status_mask |= FE | PE;
 791         if (termios->c_iflag & IGNBRK) {
 792                 port->ignore_status_mask |= BI;
 793                 /*
 794                  * If we're ignoring parity and break indicators,
 795                  * ignore overruns too (for real raw support).
 796                  */
 797                 if (termios->c_iflag & IGNPAR)
 798                         port->ignore_status_mask |= OE;
 799         }
 800
 801         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 802         quot = uart_get_divisor(port, baud);
 803         spin_lock_irqsave(&uart->port.lock, flags);
 804
 805         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 806
 807         do {
 808                 lsr = UART_GET_LSR(uart);
 809         } while (!(lsr & TEMT));
 810
 811         /* Disable UART */
 812         ier = UART_GET_IER(uart);
 813 #ifdef CONFIG_BF54x
 814         UART_CLEAR_IER(uart, 0xF);
 815 #else
 816         UART_PUT_IER(uart, 0);
 817 #endif
 818
 819 #ifndef CONFIG_BF54x
 820         /* Set DLAB in LCR to Access DLL and DLH */
 821         val = UART_GET_LCR(uart);
 822         val |= DLAB;
 823         UART_PUT_LCR(uart, val);
 824         SSYNC();
 825 #endif
 826
 827         UART_PUT_DLL(uart, quot & 0xFF);
 828         SSYNC();
 829         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 830         SSYNC();
 831
 832 #ifndef CONFIG_BF54x
 833         /* Clear DLAB in LCR to Access THR RBR IER */
 834         val = UART_GET_LCR(uart);
 835         val &= ~DLAB;
 836         UART_PUT_LCR(uart, val);
 837         SSYNC();
 838 #endif
 839
 840         UART_PUT_LCR(uart, lcr);
 841
 842         /* Enable UART */
 843 #ifdef CONFIG_BF54x
 844         UART_SET_IER(uart, ier);
 845 #else
 846         UART_PUT_IER(uart, ier);
 847 #endif
 848
 849         val = UART_GET_GCTL(uart);
 850         val |= UCEN;
 851         UART_PUT_GCTL(uart, val);
 852
 853         spin_unlock_irqrestore(&uart->port.lock, flags);
 854 }
 855
 856 static const char *bfin_serial_type(struct uart_port *port)
 857 {
 858         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 859
 860         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 861 }
 862
 863 /*
 864  * Release the memory region(s) being used by 'port'.
 865  */
 866 static void bfin_serial_release_port(struct uart_port *port)
 867 {
 868 }
 869
 870 /*
 871  * Request the memory region(s) being used by 'port'.
 872  */
 873 static int bfin_serial_request_port(struct uart_port *port)
 874 {
 875         return 0;
 876 }
 877
 878 /*
 879  * Configure/autoconfigure the port.
 880  */
 881 static void bfin_serial_config_port(struct uart_port *port, int flags)
 882 {
 883         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 884
 885         if (flags & UART_CONFIG_TYPE &&
 886             bfin_serial_request_port(&uart->port) == 0)
 887                 uart->port.type = PORT_BFIN;
 888 }
 889
 890 /*
 891  * Verify the new serial_struct (for TIOCSSERIAL).
 892  * The only change we allow are to the flags and type, and
 893  * even then only between PORT_BFIN and PORT_UNKNOWN
 894  */
 895 static int
 896 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 897 {
 898         return 0;
 899 }
 900
 901 static struct uart_ops bfin_serial_pops = {
 902         .tx_empty       = bfin_serial_tx_empty,
 903         .set_mctrl      = bfin_serial_set_mctrl,
 904         .get_mctrl      = bfin_serial_get_mctrl,
 905         .stop_tx        = bfin_serial_stop_tx,
 906         .start_tx       = bfin_serial_start_tx,
 907         .stop_rx        = bfin_serial_stop_rx,
 908         .enable_ms      = bfin_serial_enable_ms,
 909         .break_ctl      = bfin_serial_break_ctl,
 910         .startup        = bfin_serial_startup,
 911         .shutdown       = bfin_serial_shutdown,
 912         .set_termios    = bfin_serial_set_termios,
 913         .type           = bfin_serial_type,
 914         .release_port   = bfin_serial_release_port,
 915         .request_port   = bfin_serial_request_port,
 916         .config_port    = bfin_serial_config_port,
 917         .verify_port    = bfin_serial_verify_port,
 918 };
 919
 920 static void __init bfin_serial_init_ports(void)
 921 {
 922         static int first = 1;
 923         int i;
 924
 925         if (!first)
 926                 return;
 927         first = 0;
 928
 929         for (i = 0; i < nr_ports; i++) {
 930                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 931                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 932                 bfin_serial_ports[i].port.line      = i;
 933                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 934                 bfin_serial_ports[i].port.membase   =
 935                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 936                 bfin_serial_ports[i].port.mapbase   =
 937                         bfin_serial_resource[i].uart_base_addr;
 938                 bfin_serial_ports[i].port.irq       =
 939                         bfin_serial_resource[i].uart_irq;
 940                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 941 #ifdef CONFIG_SERIAL_BFIN_DMA
 942                 bfin_serial_ports[i].tx_done        = 1;
 943                 bfin_serial_ports[i].tx_count       = 0;
 944                 bfin_serial_ports[i].tx_dma_channel =
 945                         bfin_serial_resource[i].uart_tx_dma_channel;
 946                 bfin_serial_ports[i].rx_dma_channel =
 947                         bfin_serial_resource[i].uart_rx_dma_channel;
 948                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 949 #endif
 950 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 951                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 952                 bfin_serial_ports[i].cts_pin        =
 953                         bfin_serial_resource[i].uart_cts_pin;
 954                 bfin_serial_ports[i].rts_pin        =
 955                         bfin_serial_resource[i].uart_rts_pin;
 956 #endif
 957                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 958         }
 959
 960 }
 961
 962 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 963 /*
 964  * If the port was already initialised (eg, by a boot loader),
 965  * try to determine the current setup.
 966  */
 967 static void __init
 968 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 969                            int *parity, int *bits)
 970 {
 971         unsigned short status;
 972
 973         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 974         if (status == (ERBFI | ETBEI)) {
 975                 /* ok, the port was enabled */
 976                 unsigned short lcr, val;
 977                 unsigned short dlh, dll;
 978
 979                 lcr = UART_GET_LCR(uart);
 980
 981                 *parity = 'n';
 982                 if (lcr & PEN) {
 983                         if (lcr & EPS)
 984                                 *parity = 'e';
 985                         else
 986                                 *parity = 'o';
 987                 }
 988                 switch (lcr & 0x03) {
 989                         case 0: *bits = 5; break;
 990                         case 1: *bits = 6; break;
 991                         case 2: *bits = 7; break;
 992                         case 3: *bits = 8; break;
 993                 }
 994 #ifndef CONFIG_BF54x
 995                 /* Set DLAB in LCR to Access DLL and DLH */
 996                 val = UART_GET_LCR(uart);
 997                 val |= DLAB;
 998                 UART_PUT_LCR(uart, val);
 999 #endif
1000
1001                 dll = UART_GET_DLL(uart);
1002                 dlh = UART_GET_DLH(uart);
1003
1004 #ifndef CONFIG_BF54x
1005                 /* Clear DLAB in LCR to Access THR RBR IER */
1006                 val = UART_GET_LCR(uart);
1007                 val &= ~DLAB;
1008                 UART_PUT_LCR(uart, val);
1009 #endif
1010
1011                 *baud = get_sclk() / (16*(dll | dlh << 8));
1012         }
1013         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1014 }
1015 #endif
1016
1017 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1018 static struct uart_driver bfin_serial_reg;
1019
1020 static int __init
1021 bfin_serial_console_setup(struct console *co, char *options)
1022 {
1023         struct bfin_serial_port *uart;
1024 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1025         int baud = 57600;
1026         int bits = 8;
1027         int parity = 'n';
1028 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1029         int flow = 'r';
1030 #  else
1031         int flow = 'n';
1032 #  endif
1033 # endif
1034
1035         /*
1036          * Check whether an invalid uart number has been specified, and
1037          * if so, search for the first available port that does have
1038          * console support.
1039          */
1040         if (co->index == -1 || co->index >= nr_ports)
1041                 co->index = 0;
1042         uart = &bfin_serial_ports[co->index];
1043
1044 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1045         if (options)
1046                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1047         else
1048                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1049
1050         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1051 # else
1052         return 0;
1053 # endif
1054 }
1055 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1056                                  defined (CONFIG_EARLY_PRINTK) */
1057
1058 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1059 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1060 {
1061         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1062         while (!(UART_GET_LSR(uart) & THRE))
1063                 barrier();
1064         UART_PUT_CHAR(uart, ch);
1065         SSYNC();
1066 }
1067
1068 /*
1069  * Interrupts are disabled on entering
1070  */
1071 static void
1072 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1073 {
1074         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1075         int flags = 0;
1076
1077         spin_lock_irqsave(&uart->port.lock, flags);
1078         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1079         spin_unlock_irqrestore(&uart->port.lock, flags);
1080
1081 }
1082
1083 static struct console bfin_serial_console = {
1084         .name           = BFIN_SERIAL_NAME,
1085         .write          = bfin_serial_console_write,
1086         .device         = uart_console_device,
1087         .setup          = bfin_serial_console_setup,
1088         .flags          = CON_PRINTBUFFER,
1089         .index          = -1,
1090         .data           = &bfin_serial_reg,
1091 };
1092
1093 static int __init bfin_serial_rs_console_init(void)
1094 {
1095         bfin_serial_init_ports();
1096         register_console(&bfin_serial_console);
1097 #ifdef CONFIG_KGDB_UART
1098         kgdb_entry_state = 0;
1099         init_kgdb_uart();
1100 #endif
1101         return 0;
1102 }
1103 console_initcall(bfin_serial_rs_console_init);
1104
1105 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1106 #else
1107 #define BFIN_SERIAL_CONSOLE     NULL
1108 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1109
1110
1111 #ifdef CONFIG_EARLY_PRINTK
1112 static __init void early_serial_putc(struct uart_port *port, int ch)
1113 {
1114         unsigned timeout = 0xffff;
1115         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1116
1117         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1118                 cpu_relax();
1119         UART_PUT_CHAR(uart, ch);
1120 }
1121
1122 static __init void early_serial_write(struct console *con, const char *s,
1123                                         unsigned int n)
1124 {
1125         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1126         unsigned int i;
1127
1128         for (i = 0; i < n; i++, s++) {
1129                 if (*s == '\n')
1130                         early_serial_putc(&uart->port, '\r');
1131                 early_serial_putc(&uart->port, *s);
1132         }
1133 }
1134
1135 static struct __init console bfin_early_serial_console = {
1136         .name = "early_BFuart",
1137         .write = early_serial_write,
1138         .device = uart_console_device,
1139         .flags = CON_PRINTBUFFER,
1140         .setup = bfin_serial_console_setup,
1141         .index = -1,
1142         .data  = &bfin_serial_reg,
1143 };
1144
1145 struct console __init *bfin_earlyserial_init(unsigned int port,
1146                                                 unsigned int cflag)
1147 {
1148         struct bfin_serial_port *uart;
1149         struct ktermios t;
1150
1151         if (port == -1 || port >= nr_ports)
1152                 port = 0;
1153         bfin_serial_init_ports();
1154         bfin_early_serial_console.index = port;
1155         uart = &bfin_serial_ports[port];
1156         t.c_cflag = cflag;
1157         t.c_iflag = 0;
1158         t.c_oflag = 0;
1159         t.c_lflag = ICANON;
1160         t.c_line = port;
1161         bfin_serial_set_termios(&uart->port, &t, &t);
1162         return &bfin_early_serial_console;
1163 }
1164
1165 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1166
1167 static struct uart_driver bfin_serial_reg = {
1168         .owner                  = THIS_MODULE,
1169         .driver_name            = "bfin-uart",
1170         .dev_name               = BFIN_SERIAL_NAME,
1171         .major                  = BFIN_SERIAL_MAJOR,
1172         .minor                  = BFIN_SERIAL_MINOR,
1173         .nr                     = NR_PORTS,
1174         .cons                   = BFIN_SERIAL_CONSOLE,
1175 };
1176
1177 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1178 {
1179         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1180
1181         if (uart)
1182                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1183
1184         return 0;
1185 }
1186
1187 static int bfin_serial_resume(struct platform_device *dev)
1188 {
1189         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1190
1191         if (uart)
1192                 uart_resume_port(&bfin_serial_reg, &uart->port);
1193
1194         return 0;
1195 }
1196
1197 static int bfin_serial_probe(struct platform_device *dev)
1198 {
1199         struct resource *res = dev->resource;
1200         int i;
1201
1202         for (i = 0; i < dev->num_resources; i++, res++)
1203                 if (res->flags & IORESOURCE_MEM)
1204                         break;
1205
1206         if (i < dev->num_resources) {
1207                 for (i = 0; i < nr_ports; i++, res++) {
1208                         if (bfin_serial_ports[i].port.mapbase != res->start)
1209                                 continue;
1210                         bfin_serial_ports[i].port.dev = &dev->dev;
1211                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1212                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1213                 }
1214         }
1215
1216         return 0;
1217 }
1218
1219 static int bfin_serial_remove(struct platform_device *pdev)
1220 {
1221         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1222
1223
1224 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1225         gpio_free(uart->cts_pin);
1226         gpio_free(uart->rts_pin);
1227 #endif
1228
1229         platform_set_drvdata(pdev, NULL);
1230
1231         if (uart)
1232                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1233
1234         return 0;
1235 }
1236
1237 static struct platform_driver bfin_serial_driver = {
1238         .probe          = bfin_serial_probe,
1239         .remove         = bfin_serial_remove,
1240         .suspend        = bfin_serial_suspend,
1241         .resume         = bfin_serial_resume,
1242         .driver         = {
1243                 .name   = "bfin-uart",
1244         },
1245 };
1246
1247 static int __init bfin_serial_init(void)
1248 {
1249         int ret;
1250 #ifdef CONFIG_KGDB_UART
1251         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1252         struct ktermios t;
1253 #endif
1254
1255         pr_info("Serial: Blackfin serial driver\n");
1256
1257         bfin_serial_init_ports();
1258
1259         ret = uart_register_driver(&bfin_serial_reg);
1260         if (ret == 0) {
1261                 ret = platform_driver_register(&bfin_serial_driver);
1262                 if (ret) {
1263                         pr_debug("uart register failed\n");
1264                         uart_unregister_driver(&bfin_serial_reg);
1265                 }
1266         }
1267 #ifdef CONFIG_KGDB_UART
1268         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1269                 request_irq(uart->port.irq, bfin_serial_rx_int,
1270                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1271                 pr_info("Request irq for kgdb uart port\n");
1272 #ifdef CONFIG_BF54x
1273                 UART_SET_IER(uart, ERBFI);
1274 #else
1275                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1276 #endif
1277                 SSYNC();
1278                 t.c_cflag = CS8|B57600;
1279                 t.c_iflag = 0;
1280                 t.c_oflag = 0;
1281                 t.c_lflag = ICANON;
1282                 t.c_line = CONFIG_KGDB_UART_PORT;
1283                 bfin_serial_set_termios(&uart->port, &t, &t);
1284         }
1285 #endif
1286         return ret;
1287 }
1288
1289 static void __exit bfin_serial_exit(void)
1290 {
1291         platform_driver_unregister(&bfin_serial_driver);
1292         uart_unregister_driver(&bfin_serial_reg);
1293 }
1294
1295 module_init(bfin_serial_init);
1296 module_exit(bfin_serial_exit);
1297
1298 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1299 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1300 MODULE_LICENSE("GPL");
1301 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);