drivers/serial/bfin_5xx.c

   1 /*
   2  * Blackfin On-Chip Serial Driver
   3  *
   4  * Copyright 2006-2007 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  12 #define SUPPORT_SYSRQ
  13 #endif
  14
  15 #include <linux/module.h>
  16 #include <linux/ioport.h>
  17 #include <linux/init.h>
  18 #include <linux/console.h>
  19 #include <linux/sysrq.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/tty.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/serial_core.h>
  24
  25 #ifdef CONFIG_KGDB_UART
  26 #include <linux/kgdb.h>
  27 #include <asm/irq_regs.h>
  28 #endif
  29
  30 #include <asm/gpio.h>
  31 #include <asm/mach/bfin_serial_5xx.h>
  32
  33 #ifdef CONFIG_SERIAL_BFIN_DMA
  34 #include <linux/dma-mapping.h>
  35 #include <asm/io.h>
  36 #include <asm/irq.h>
  37 #include <asm/cacheflush.h>
  38 #endif
  39
  40 /* UART name and device definitions */
  41 #define BFIN_SERIAL_NAME        "ttyBF"
  42 #define BFIN_SERIAL_MAJOR       204
  43 #define BFIN_SERIAL_MINOR       64
  44
  45 /*
  46  * Setup for console. Argument comes from the menuconfig
  47  */
  48 #define DMA_RX_XCOUNT           512
  49 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  50
  51 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
  52
  53 #ifdef CONFIG_SERIAL_BFIN_DMA
  54 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  55 #else
  56 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  57 #endif
  58
  59 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
  60
  61 /*
  62  * interrupts are disabled on entry
  63  */
  64 static void bfin_serial_stop_tx(struct uart_port *port)
  65 {
  66         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  67         struct circ_buf *xmit = &uart->port.info->xmit;
  68 #if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
  69         unsigned short ier;
  70 #endif
  71
  72         while (!(UART_GET_LSR(uart) & TEMT))
  73                 cpu_relax();
  74
  75 #ifdef CONFIG_SERIAL_BFIN_DMA
  76         disable_dma(uart->tx_dma_channel);
  77         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
  78         uart->port.icount.tx += uart->tx_count;
  79         uart->tx_count = 0;
  80         uart->tx_done = 1;
  81 #else
  82 #ifdef CONFIG_BF54x
  83         /* Clear TFI bit */
  84         UART_PUT_LSR(uart, TFI);
  85         UART_CLEAR_IER(uart, ETBEI);
  86 #else
  87         ier = UART_GET_IER(uart);
  88         ier &= ~ETBEI;
  89         UART_PUT_IER(uart, ier);
  90 #endif
  91 #endif
  92 }
  93
  94 /*
  95  * port is locked and interrupts are disabled
  96  */
  97 static void bfin_serial_start_tx(struct uart_port *port)
  98 {
  99         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 100
 101 #ifdef CONFIG_SERIAL_BFIN_DMA
 102         if (uart->tx_done)
 103                 bfin_serial_dma_tx_chars(uart);
 104 #else
 105 #ifdef CONFIG_BF54x
 106         UART_SET_IER(uart, ETBEI);
 107 #else
 108         unsigned short ier;
 109         ier = UART_GET_IER(uart);
 110         ier |= ETBEI;
 111         UART_PUT_IER(uart, ier);
 112 #endif
 113         bfin_serial_tx_chars(uart);
 114 #endif
 115 }
 116
 117 /*
 118  * Interrupts are enabled
 119  */
 120 static void bfin_serial_stop_rx(struct uart_port *port)
 121 {
 122         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 123 #ifdef  CONFIG_KGDB_UART
 124         if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 125 #endif
 126 #ifdef CONFIG_BF54x
 127         UART_CLEAR_IER(uart, ERBFI);
 128 #else
 129         unsigned short ier;
 130
 131         ier = UART_GET_IER(uart);
 132         ier &= ~ERBFI;
 133         UART_PUT_IER(uart, ier);
 134 #endif
 135 #ifdef  CONFIG_KGDB_UART
 136         }
 137 #endif
 138 }
 139
 140 /*
 141  * Set the modem control timer to fire immediately.
 142  */
 143 static void bfin_serial_enable_ms(struct uart_port *port)
 144 {
 145 }
 146
 147 #ifdef CONFIG_KGDB_UART
 148 static int kgdb_entry_state;
 149
 150 void kgdb_put_debug_char(int chr)
 151 {
 152         struct bfin_serial_port *uart;
 153
 154         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 155                 uart = &bfin_serial_ports[0];
 156         else
 157                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 158
 159         while (!(UART_GET_LSR(uart) & THRE)) {
 160                 SSYNC();
 161         }
 162
 163 #ifndef CONFIG_BF54x
 164         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 165         SSYNC();
 166 #endif
 167         UART_PUT_CHAR(uart, (unsigned char)chr);
 168         SSYNC();
 169 }
 170
 171 int kgdb_get_debug_char(void)
 172 {
 173         struct bfin_serial_port *uart;
 174         unsigned char chr;
 175
 176         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 177                 uart = &bfin_serial_ports[0];
 178         else
 179                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 180
 181         while(!(UART_GET_LSR(uart) & DR)) {
 182                 SSYNC();
 183         }
 184 #ifndef CONFIG_BF54x
 185         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 186         SSYNC();
 187 #endif
 188         chr = UART_GET_CHAR(uart);
 189         SSYNC();
 190
 191         return chr;
 192 }
 193 #endif
 194
 195 #if ANOMALY_05000230 && defined(CONFIG_SERIAL_BFIN_PIO)
 196 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 197 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 198 #else
 199 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 200 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 201 #endif
 202
 203 #ifdef CONFIG_SERIAL_BFIN_PIO
 204 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 205 {
 206         struct tty_struct *tty = uart->port.info->tty;
 207         unsigned int status, ch, flg;
 208         static struct timeval anomaly_start = { .tv_sec = 0 };
 209 #ifdef CONFIG_KGDB_UART
 210         struct pt_regs *regs = get_irq_regs();
 211 #endif
 212
 213         status = UART_GET_LSR(uart);
 214         UART_CLEAR_LSR(uart);
 215
 216         ch = UART_GET_CHAR(uart);
 217         uart->port.icount.rx++;
 218
 219 #ifdef CONFIG_KGDB_UART
 220         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
 221                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
 222                         kgdb_breakkey_pressed(regs);
 223                         return;
 224                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
 225                         kgdb_entry_state = 1;
 226                 } else if (kgdb_entry_state == 1 && ch == 'q') {
 227                         kgdb_entry_state = 0;
 228                         kgdb_breakkey_pressed(regs);
 229                         return;
 230                 } else if (ch == 0x3) {/* Ctrl + C */
 231                         kgdb_entry_state = 0;
 232                         kgdb_breakkey_pressed(regs);
 233                         return;
 234                 } else {
 235                         kgdb_entry_state = 0;
 236                 }
 237         }
 238 #endif
 239
 240         if (ANOMALY_05000230) {
 241                 /* The BF533 (and BF561) family of processors have a nice anomaly
 242                  * where they continuously generate characters for a "single" break.
 243                  * We have to basically ignore this flood until the "next" valid
 244                  * character comes across.  Due to the nature of the flood, it is
 245                  * not possible to reliably catch bytes that are sent too quickly
 246                  * after this break.  So application code talking to the Blackfin
 247                  * which sends a break signal must allow at least 1.5 character
 248                  * times after the end of the break for things to stabilize.  This
 249                  * timeout was picked as it must absolutely be larger than 1
 250                  * character time +/- some percent.  So 1.5 sounds good.  All other
 251                  * Blackfin families operate properly.  Woo.
 252                  * Note: While Anomaly 05000230 does not directly address this,
 253                  *       the changes that went in for it also fixed this issue.
 254                  *       That anomaly was fixed in 0.5+ silicon.  I like bunnies.
 255                  */
 256                 if (anomaly_start.tv_sec) {
 257                         struct timeval curr;
 258                         suseconds_t usecs;
 259
 260                         if ((~ch & (~ch + 1)) & 0xff)
 261                                 goto known_good_char;
 262
 263                         do_gettimeofday(&curr);
 264                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
 265                                 goto known_good_char;
 266
 267                         usecs = 0;
 268                         if (curr.tv_sec != anomaly_start.tv_sec)
 269                                 usecs += USEC_PER_SEC;
 270                         usecs += curr.tv_usec - anomaly_start.tv_usec;
 271
 272                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
 273                                 goto known_good_char;
 274
 275                         if (ch)
 276                                 anomaly_start.tv_sec = 0;
 277                         else
 278                                 anomaly_start = curr;
 279
 280                         return;
 281
 282  known_good_char:
 283                         anomaly_start.tv_sec = 0;
 284                 }
 285         }
 286
 287         if (status & BI) {
 288                 if (ANOMALY_05000230)
 289                         if (bfin_revid() < 5)
 290                                 do_gettimeofday(&anomaly_start);
 291                 uart->port.icount.brk++;
 292                 if (uart_handle_break(&uart->port))
 293                         goto ignore_char;
 294                 status &= ~(PE | FE);
 295         }
 296         if (status & PE)
 297                 uart->port.icount.parity++;
 298         if (status & OE)
 299                 uart->port.icount.overrun++;
 300         if (status & FE)
 301                 uart->port.icount.frame++;
 302
 303         status &= uart->port.read_status_mask;
 304
 305         if (status & BI)
 306                 flg = TTY_BREAK;
 307         else if (status & PE)
 308                 flg = TTY_PARITY;
 309         else if (status & FE)
 310                 flg = TTY_FRAME;
 311         else
 312                 flg = TTY_NORMAL;
 313
 314         if (uart_handle_sysrq_char(&uart->port, ch))
 315                 goto ignore_char;
 316
 317         uart_insert_char(&uart->port, status, OE, ch, flg);
 318
 319  ignore_char:
 320         tty_flip_buffer_push(tty);
 321 }
 322
 323 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 324 {
 325         struct circ_buf *xmit = &uart->port.info->xmit;
 326
 327         if (uart->port.x_char) {
 328                 UART_PUT_CHAR(uart, uart->port.x_char);
 329                 uart->port.icount.tx++;
 330                 uart->port.x_char = 0;
 331         }
 332         /*
 333          * Check the modem control lines before
 334          * transmitting anything.
 335          */
 336         bfin_serial_mctrl_check(uart);
 337
 338         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 339                 bfin_serial_stop_tx(&uart->port);
 340                 return;
 341         }
 342
 343         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 344                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 345                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 346                 uart->port.icount.tx++;
 347                 SSYNC();
 348         }
 349
 350         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 351                 uart_write_wakeup(&uart->port);
 352
 353         if (uart_circ_empty(xmit))
 354                 bfin_serial_stop_tx(&uart->port);
 355 }
 356
 357 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 358 {
 359         struct bfin_serial_port *uart = dev_id;
 360
 361         spin_lock(&uart->port.lock);
 362         while (UART_GET_LSR(uart) & DR)
 363                 bfin_serial_rx_chars(uart);
 364         spin_unlock(&uart->port.lock);
 365
 366         return IRQ_HANDLED;
 367 }
 368
 369 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 370 {
 371         struct bfin_serial_port *uart = dev_id;
 372
 373         spin_lock(&uart->port.lock);
 374         if (UART_GET_LSR(uart) & THRE)
 375                 bfin_serial_tx_chars(uart);
 376         spin_unlock(&uart->port.lock);
 377
 378         return IRQ_HANDLED;
 379 }
 380 #endif
 381
 382 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 383 static void bfin_serial_do_work(struct work_struct *work)
 384 {
 385         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 386
 387         bfin_serial_mctrl_check(uart);
 388 }
 389 #endif
 390
 391 #ifdef CONFIG_SERIAL_BFIN_DMA
 392 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 393 {
 394         struct circ_buf *xmit = &uart->port.info->xmit;
 395         unsigned short ier;
 396
 397         uart->tx_done = 0;
 398
 399         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 400                 uart->tx_count = 0;
 401                 uart->tx_done = 1;
 402                 return;
 403         }
 404
 405         if (uart->port.x_char) {
 406                 UART_PUT_CHAR(uart, uart->port.x_char);
 407                 uart->port.icount.tx++;
 408                 uart->port.x_char = 0;
 409         }
 410
 411         /*
 412          * Check the modem control lines before
 413          * transmitting anything.
 414          */
 415         bfin_serial_mctrl_check(uart);
 416
 417         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 418         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 419                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 420         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 421                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 422         set_dma_config(uart->tx_dma_channel,
 423                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 424                         INTR_ON_BUF,
 425                         DIMENSION_LINEAR,
 426                         DATA_SIZE_8,
 427                         DMA_SYNC_RESTART));
 428         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 429         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 430         set_dma_x_modify(uart->tx_dma_channel, 1);
 431         enable_dma(uart->tx_dma_channel);
 432
 433 #ifdef CONFIG_BF54x
 434         UART_SET_IER(uart, ETBEI);
 435 #else
 436         ier = UART_GET_IER(uart);
 437         ier |= ETBEI;
 438         UART_PUT_IER(uart, ier);
 439 #endif
 440 }
 441
 442 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 443 {
 444         struct tty_struct *tty = uart->port.info->tty;
 445         int i, flg, status;
 446
 447         status = UART_GET_LSR(uart);
 448         UART_CLEAR_LSR(uart);
 449
 450         uart->port.icount.rx +=
 451                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 452                 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.tail; i != uart->rx_dma_buf.head; i++) {
 479                 if (i >= UART_XMIT_SIZE)
 480                         i = 0;
 481                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 482                         uart_insert_char(&uart->port, status, OE,
 483                                 uart->rx_dma_buf.buf[i], flg);
 484         }
 485
 486  dma_ignore_char:
 487         tty_flip_buffer_push(tty);
 488 }
 489
 490 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 491 {
 492         int x_pos, pos;
 493
 494         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 495         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 496         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 497         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
 498                 uart->rx_dma_nrows = 0;
 499         x_pos = DMA_RX_XCOUNT - x_pos;
 500         if (x_pos == DMA_RX_XCOUNT)
 501                 x_pos = 0;
 502
 503         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 504         if (pos != uart->rx_dma_buf.tail) {
 505                 uart->rx_dma_buf.head = pos;
 506                 bfin_serial_dma_rx_chars(uart);
 507                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 508         }
 509
 510         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 511         add_timer(&(uart->rx_dma_timer));
 512 }
 513
 514 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 515 {
 516         struct bfin_serial_port *uart = dev_id;
 517         struct circ_buf *xmit = &uart->port.info->xmit;
 518         unsigned short ier;
 519
 520         spin_lock(&uart->port.lock);
 521         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 522                 disable_dma(uart->tx_dma_channel);
 523                 clear_dma_irqstat(uart->tx_dma_channel);
 524 #ifdef CONFIG_BF54x
 525                 UART_CLEAR_IER(uart, ETBEI);
 526 #else
 527                 ier = UART_GET_IER(uart);
 528                 ier &= ~ETBEI;
 529                 UART_PUT_IER(uart, ier);
 530 #endif
 531                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 532                 uart->port.icount.tx += uart->tx_count;
 533
 534                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 535                         uart_write_wakeup(&uart->port);
 536
 537                 bfin_serial_dma_tx_chars(uart);
 538         }
 539
 540         spin_unlock(&uart->port.lock);
 541         return IRQ_HANDLED;
 542 }
 543
 544 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 545 {
 546         struct bfin_serial_port *uart = dev_id;
 547         unsigned short irqstat;
 548
 549         spin_lock(&uart->port.lock);
 550         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 551         clear_dma_irqstat(uart->rx_dma_channel);
 552         spin_unlock(&uart->port.lock);
 553
 554         del_timer(&(uart->rx_dma_timer));
 555         uart->rx_dma_timer.expires = jiffies;
 556         add_timer(&(uart->rx_dma_timer));
 557
 558         return IRQ_HANDLED;
 559 }
 560 #endif
 561
 562 /*
 563  * Return TIOCSER_TEMT when transmitter is not busy.
 564  */
 565 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 566 {
 567         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 568         unsigned short lsr;
 569
 570         lsr = UART_GET_LSR(uart);
 571         if (lsr & TEMT)
 572                 return TIOCSER_TEMT;
 573         else
 574                 return 0;
 575 }
 576
 577 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 578 {
 579 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 580         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 581         if (uart->cts_pin < 0)
 582                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 583
 584 # ifdef BF54x
 585         if (UART_GET_MSR(uart) & CTS)
 586 # else
 587         if (gpio_get_value(uart->cts_pin))
 588 # endif
 589                 return TIOCM_DSR | TIOCM_CAR;
 590         else
 591 #endif
 592                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 593 }
 594
 595 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 596 {
 597 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 598         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 599         if (uart->rts_pin < 0)
 600                 return;
 601
 602         if (mctrl & TIOCM_RTS)
 603 # ifdef BF54x
 604                 UART_PUT_MCR(uart, UART_GET_MCR(uart) & ~MRTS);
 605 # else
 606                 gpio_set_value(uart->rts_pin, 0);
 607 # endif
 608         else
 609 # ifdef BF54x
 610                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | MRTS);
 611 # else
 612                 gpio_set_value(uart->rts_pin, 1);
 613 # endif
 614 #endif
 615 }
 616
 617 /*
 618  * Handle any change of modem status signal since we were last called.
 619  */
 620 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 621 {
 622 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 623         unsigned int status;
 624         struct uart_info *info = uart->port.info;
 625         struct tty_struct *tty = info->tty;
 626
 627         status = bfin_serial_get_mctrl(&uart->port);
 628         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 629         if (!(status & TIOCM_CTS)) {
 630                 tty->hw_stopped = 1;
 631                 schedule_work(&uart->cts_workqueue);
 632         } else {
 633                 tty->hw_stopped = 0;
 634         }
 635 #endif
 636 }
 637
 638 /*
 639  * Interrupts are always disabled.
 640  */
 641 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 642 {
 643         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 644         u16 lcr = UART_GET_LCR(uart);
 645         if (break_state)
 646                 lcr |= SB;
 647         else
 648                 lcr &= ~SB;
 649         UART_PUT_LCR(uart, lcr);
 650         SSYNC();
 651 }
 652
 653 static int bfin_serial_startup(struct uart_port *port)
 654 {
 655         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 656
 657 #ifdef CONFIG_SERIAL_BFIN_DMA
 658         dma_addr_t dma_handle;
 659
 660         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 661                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 662                 return -EBUSY;
 663         }
 664
 665         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 666                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 667                 free_dma(uart->rx_dma_channel);
 668                 return -EBUSY;
 669         }
 670
 671         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 672         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 673
 674         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 675         uart->rx_dma_buf.head = 0;
 676         uart->rx_dma_buf.tail = 0;
 677         uart->rx_dma_nrows = 0;
 678
 679         set_dma_config(uart->rx_dma_channel,
 680                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 681                                 INTR_ON_ROW, DIMENSION_2D,
 682                                 DATA_SIZE_8,
 683                                 DMA_SYNC_RESTART));
 684         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 685         set_dma_x_modify(uart->rx_dma_channel, 1);
 686         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 687         set_dma_y_modify(uart->rx_dma_channel, 1);
 688         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 689         enable_dma(uart->rx_dma_channel);
 690
 691         uart->rx_dma_timer.data = (unsigned long)(uart);
 692         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 693         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 694         add_timer(&(uart->rx_dma_timer));
 695 #else
 696         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 697              "BFIN_UART_RX", uart)) {
 698 # ifdef CONFIG_KGDB_UART
 699                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 700 # endif
 701                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 702                 return -EBUSY;
 703 # ifdef CONFIG_KGDB_UART
 704                 }
 705 # endif
 706         }
 707
 708
 709         if (request_irq
 710             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 711              "BFIN_UART_TX", uart)) {
 712                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 713                 free_irq(uart->port.irq, uart);
 714                 return -EBUSY;
 715         }
 716 #endif
 717 #ifdef CONFIG_BF54x
 718         UART_SET_IER(uart, ERBFI);
 719 #else
 720         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 721 #endif
 722         return 0;
 723 }
 724
 725 static void bfin_serial_shutdown(struct uart_port *port)
 726 {
 727         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 728
 729 #ifdef CONFIG_SERIAL_BFIN_DMA
 730         disable_dma(uart->tx_dma_channel);
 731         free_dma(uart->tx_dma_channel);
 732         disable_dma(uart->rx_dma_channel);
 733         free_dma(uart->rx_dma_channel);
 734         del_timer(&(uart->rx_dma_timer));
 735         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 736 #else
 737 #ifdef  CONFIG_KGDB_UART
 738         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 739 #endif
 740         free_irq(uart->port.irq, uart);
 741         free_irq(uart->port.irq+1, uart);
 742 #endif
 743 }
 744
 745 static void
 746 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 747                    struct ktermios *old)
 748 {
 749         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 750         unsigned long flags;
 751         unsigned int baud, quot;
 752         unsigned short val, ier, lsr, lcr = 0;
 753
 754         switch (termios->c_cflag & CSIZE) {
 755         case CS8:
 756                 lcr = WLS(8);
 757                 break;
 758         case CS7:
 759                 lcr = WLS(7);
 760                 break;
 761         case CS6:
 762                 lcr = WLS(6);
 763                 break;
 764         case CS5:
 765                 lcr = WLS(5);
 766                 break;
 767         default:
 768                 printk(KERN_ERR "%s: word lengh not supported\n",
 769                         __FUNCTION__);
 770         }
 771
 772         if (termios->c_cflag & CSTOPB)
 773                 lcr |= STB;
 774         if (termios->c_cflag & PARENB)
 775                 lcr |= PEN;
 776         if (!(termios->c_cflag & PARODD))
 777                 lcr |= EPS;
 778         if (termios->c_cflag & CMSPAR)
 779                 lcr |= STP;
 780
 781         port->read_status_mask = OE;
 782         if (termios->c_iflag & INPCK)
 783                 port->read_status_mask |= (FE | PE);
 784         if (termios->c_iflag & (BRKINT | PARMRK))
 785                 port->read_status_mask |= BI;
 786
 787         /*
 788          * Characters to ignore
 789          */
 790         port->ignore_status_mask = 0;
 791         if (termios->c_iflag & IGNPAR)
 792                 port->ignore_status_mask |= FE | PE;
 793         if (termios->c_iflag & IGNBRK) {
 794                 port->ignore_status_mask |= BI;
 795                 /*
 796                  * If we're ignoring parity and break indicators,
 797                  * ignore overruns too (for real raw support).
 798                  */
 799                 if (termios->c_iflag & IGNPAR)
 800                         port->ignore_status_mask |= OE;
 801         }
 802
 803         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 804         quot = uart_get_divisor(port, baud);
 805         spin_lock_irqsave(&uart->port.lock, flags);
 806
 807         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 808
 809         do {
 810                 lsr = UART_GET_LSR(uart);
 811         } while (!(lsr & TEMT));
 812
 813         /* Disable UART */
 814         ier = UART_GET_IER(uart);
 815 #ifdef CONFIG_BF54x
 816         UART_CLEAR_IER(uart, 0xF);
 817 #else
 818         UART_PUT_IER(uart, 0);
 819 #endif
 820
 821 #ifndef CONFIG_BF54x
 822         /* Set DLAB in LCR to Access DLL and DLH */
 823         val = UART_GET_LCR(uart);
 824         val |= DLAB;
 825         UART_PUT_LCR(uart, val);
 826         SSYNC();
 827 #endif
 828
 829         UART_PUT_DLL(uart, quot & 0xFF);
 830         SSYNC();
 831         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 832         SSYNC();
 833
 834 #ifndef CONFIG_BF54x
 835         /* Clear DLAB in LCR to Access THR RBR IER */
 836         val = UART_GET_LCR(uart);
 837         val &= ~DLAB;
 838         UART_PUT_LCR(uart, val);
 839         SSYNC();
 840 #endif
 841
 842         UART_PUT_LCR(uart, lcr);
 843
 844         /* Enable UART */
 845 #ifdef CONFIG_BF54x
 846         UART_SET_IER(uart, ier);
 847 #else
 848         UART_PUT_IER(uart, ier);
 849 #endif
 850
 851         val = UART_GET_GCTL(uart);
 852         val |= UCEN;
 853         UART_PUT_GCTL(uart, val);
 854
 855         spin_unlock_irqrestore(&uart->port.lock, flags);
 856 }
 857
 858 static const char *bfin_serial_type(struct uart_port *port)
 859 {
 860         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 861
 862         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 863 }
 864
 865 /*
 866  * Release the memory region(s) being used by 'port'.
 867  */
 868 static void bfin_serial_release_port(struct uart_port *port)
 869 {
 870 }
 871
 872 /*
 873  * Request the memory region(s) being used by 'port'.
 874  */
 875 static int bfin_serial_request_port(struct uart_port *port)
 876 {
 877         return 0;
 878 }
 879
 880 /*
 881  * Configure/autoconfigure the port.
 882  */
 883 static void bfin_serial_config_port(struct uart_port *port, int flags)
 884 {
 885         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 886
 887         if (flags & UART_CONFIG_TYPE &&
 888             bfin_serial_request_port(&uart->port) == 0)
 889                 uart->port.type = PORT_BFIN;
 890 }
 891
 892 /*
 893  * Verify the new serial_struct (for TIOCSSERIAL).
 894  * The only change we allow are to the flags and type, and
 895  * even then only between PORT_BFIN and PORT_UNKNOWN
 896  */
 897 static int
 898 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 899 {
 900         return 0;
 901 }
 902
 903 static struct uart_ops bfin_serial_pops = {
 904         .tx_empty       = bfin_serial_tx_empty,
 905         .set_mctrl      = bfin_serial_set_mctrl,
 906         .get_mctrl      = bfin_serial_get_mctrl,
 907         .stop_tx        = bfin_serial_stop_tx,
 908         .start_tx       = bfin_serial_start_tx,
 909         .stop_rx        = bfin_serial_stop_rx,
 910         .enable_ms      = bfin_serial_enable_ms,
 911         .break_ctl      = bfin_serial_break_ctl,
 912         .startup        = bfin_serial_startup,
 913         .shutdown       = bfin_serial_shutdown,
 914         .set_termios    = bfin_serial_set_termios,
 915         .type           = bfin_serial_type,
 916         .release_port   = bfin_serial_release_port,
 917         .request_port   = bfin_serial_request_port,
 918         .config_port    = bfin_serial_config_port,
 919         .verify_port    = bfin_serial_verify_port,
 920 };
 921
 922 static void __init bfin_serial_init_ports(void)
 923 {
 924         static int first = 1;
 925         int i;
 926
 927         if (!first)
 928                 return;
 929         first = 0;
 930
 931         for (i = 0; i < nr_ports; i++) {
 932                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 933                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 934                 bfin_serial_ports[i].port.line      = i;
 935                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 936                 bfin_serial_ports[i].port.membase   =
 937                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 938                 bfin_serial_ports[i].port.mapbase   =
 939                         bfin_serial_resource[i].uart_base_addr;
 940                 bfin_serial_ports[i].port.irq       =
 941                         bfin_serial_resource[i].uart_irq;
 942                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 943 #ifdef CONFIG_SERIAL_BFIN_DMA
 944                 bfin_serial_ports[i].tx_done        = 1;
 945                 bfin_serial_ports[i].tx_count       = 0;
 946                 bfin_serial_ports[i].tx_dma_channel =
 947                         bfin_serial_resource[i].uart_tx_dma_channel;
 948                 bfin_serial_ports[i].rx_dma_channel =
 949                         bfin_serial_resource[i].uart_rx_dma_channel;
 950                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 951 #endif
 952 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 953                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 954                 bfin_serial_ports[i].cts_pin        =
 955                         bfin_serial_resource[i].uart_cts_pin;
 956                 bfin_serial_ports[i].rts_pin        =
 957                         bfin_serial_resource[i].uart_rts_pin;
 958 #endif
 959                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 960         }
 961
 962 }
 963
 964 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 965 /*
 966  * If the port was already initialised (eg, by a boot loader),
 967  * try to determine the current setup.
 968  */
 969 static void __init
 970 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 971                            int *parity, int *bits)
 972 {
 973         unsigned short status;
 974
 975         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 976         if (status == (ERBFI | ETBEI)) {
 977                 /* ok, the port was enabled */
 978                 unsigned short lcr, val;
 979                 unsigned short dlh, dll;
 980
 981                 lcr = UART_GET_LCR(uart);
 982
 983                 *parity = 'n';
 984                 if (lcr & PEN) {
 985                         if (lcr & EPS)
 986                                 *parity = 'e';
 987                         else
 988                                 *parity = 'o';
 989                 }
 990                 switch (lcr & 0x03) {
 991                         case 0: *bits = 5; break;
 992                         case 1: *bits = 6; break;
 993                         case 2: *bits = 7; break;
 994                         case 3: *bits = 8; break;
 995                 }
 996 #ifndef CONFIG_BF54x
 997                 /* Set DLAB in LCR to Access DLL and DLH */
 998                 val = UART_GET_LCR(uart);
 999                 val |= DLAB;
1000                 UART_PUT_LCR(uart, val);
1001 #endif
1002
1003                 dll = UART_GET_DLL(uart);
1004                 dlh = UART_GET_DLH(uart);
1005
1006 #ifndef CONFIG_BF54x
1007                 /* Clear DLAB in LCR to Access THR RBR IER */
1008                 val = UART_GET_LCR(uart);
1009                 val &= ~DLAB;
1010                 UART_PUT_LCR(uart, val);
1011 #endif
1012
1013                 *baud = get_sclk() / (16*(dll | dlh << 8));
1014         }
1015         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1016 }
1017 #endif
1018
1019 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1020 static struct uart_driver bfin_serial_reg;
1021
1022 static int __init
1023 bfin_serial_console_setup(struct console *co, char *options)
1024 {
1025         struct bfin_serial_port *uart;
1026 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1027         int baud = 57600;
1028         int bits = 8;
1029         int parity = 'n';
1030 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1031         int flow = 'r';
1032 #  else
1033         int flow = 'n';
1034 #  endif
1035 # endif
1036
1037         /*
1038          * Check whether an invalid uart number has been specified, and
1039          * if so, search for the first available port that does have
1040          * console support.
1041          */
1042         if (co->index == -1 || co->index >= nr_ports)
1043                 co->index = 0;
1044         uart = &bfin_serial_ports[co->index];
1045
1046 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1047         if (options)
1048                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1049         else
1050                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1051
1052         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1053 # else
1054         return 0;
1055 # endif
1056 }
1057 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1058                                  defined (CONFIG_EARLY_PRINTK) */
1059
1060 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1061 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1062 {
1063         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1064         while (!(UART_GET_LSR(uart) & THRE))
1065                 barrier();
1066         UART_PUT_CHAR(uart, ch);
1067         SSYNC();
1068 }
1069
1070 /*
1071  * Interrupts are disabled on entering
1072  */
1073 static void
1074 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1075 {
1076         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1077         int flags = 0;
1078
1079         spin_lock_irqsave(&uart->port.lock, flags);
1080         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1081         spin_unlock_irqrestore(&uart->port.lock, flags);
1082
1083 }
1084
1085 static struct console bfin_serial_console = {
1086         .name           = BFIN_SERIAL_NAME,
1087         .write          = bfin_serial_console_write,
1088         .device         = uart_console_device,
1089         .setup          = bfin_serial_console_setup,
1090         .flags          = CON_PRINTBUFFER,
1091         .index          = -1,
1092         .data           = &bfin_serial_reg,
1093 };
1094
1095 static int __init bfin_serial_rs_console_init(void)
1096 {
1097         bfin_serial_init_ports();
1098         register_console(&bfin_serial_console);
1099 #ifdef CONFIG_KGDB_UART
1100         kgdb_entry_state = 0;
1101         init_kgdb_uart();
1102 #endif
1103         return 0;
1104 }
1105 console_initcall(bfin_serial_rs_console_init);
1106
1107 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1108 #else
1109 #define BFIN_SERIAL_CONSOLE     NULL
1110 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1111
1112
1113 #ifdef CONFIG_EARLY_PRINTK
1114 static __init void early_serial_putc(struct uart_port *port, int ch)
1115 {
1116         unsigned timeout = 0xffff;
1117         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1118
1119         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1120                 cpu_relax();
1121         UART_PUT_CHAR(uart, ch);
1122 }
1123
1124 static __init void early_serial_write(struct console *con, const char *s,
1125                                         unsigned int n)
1126 {
1127         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1128         unsigned int i;
1129
1130         for (i = 0; i < n; i++, s++) {
1131                 if (*s == '\n')
1132                         early_serial_putc(&uart->port, '\r');
1133                 early_serial_putc(&uart->port, *s);
1134         }
1135 }
1136
1137 static struct __init console bfin_early_serial_console = {
1138         .name = "early_BFuart",
1139         .write = early_serial_write,
1140         .device = uart_console_device,
1141         .flags = CON_PRINTBUFFER,
1142         .setup = bfin_serial_console_setup,
1143         .index = -1,
1144         .data  = &bfin_serial_reg,
1145 };
1146
1147 struct console __init *bfin_earlyserial_init(unsigned int port,
1148                                                 unsigned int cflag)
1149 {
1150         struct bfin_serial_port *uart;
1151         struct ktermios t;
1152
1153         if (port == -1 || port >= nr_ports)
1154                 port = 0;
1155         bfin_serial_init_ports();
1156         bfin_early_serial_console.index = port;
1157         uart = &bfin_serial_ports[port];
1158         t.c_cflag = cflag;
1159         t.c_iflag = 0;
1160         t.c_oflag = 0;
1161         t.c_lflag = ICANON;
1162         t.c_line = port;
1163         bfin_serial_set_termios(&uart->port, &t, &t);
1164         return &bfin_early_serial_console;
1165 }
1166
1167 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1168
1169 static struct uart_driver bfin_serial_reg = {
1170         .owner                  = THIS_MODULE,
1171         .driver_name            = "bfin-uart",
1172         .dev_name               = BFIN_SERIAL_NAME,
1173         .major                  = BFIN_SERIAL_MAJOR,
1174         .minor                  = BFIN_SERIAL_MINOR,
1175         .nr                     = NR_PORTS,
1176         .cons                   = BFIN_SERIAL_CONSOLE,
1177 };
1178
1179 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1180 {
1181         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1182
1183         if (uart)
1184                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1185
1186         return 0;
1187 }
1188
1189 static int bfin_serial_resume(struct platform_device *dev)
1190 {
1191         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1192
1193         if (uart)
1194                 uart_resume_port(&bfin_serial_reg, &uart->port);
1195
1196         return 0;
1197 }
1198
1199 static int bfin_serial_probe(struct platform_device *dev)
1200 {
1201         struct resource *res = dev->resource;
1202         int i;
1203
1204         for (i = 0; i < dev->num_resources; i++, res++)
1205                 if (res->flags & IORESOURCE_MEM)
1206                         break;
1207
1208         if (i < dev->num_resources) {
1209                 for (i = 0; i < nr_ports; i++, res++) {
1210                         if (bfin_serial_ports[i].port.mapbase != res->start)
1211                                 continue;
1212                         bfin_serial_ports[i].port.dev = &dev->dev;
1213                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1214                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1215                 }
1216         }
1217
1218         return 0;
1219 }
1220
1221 static int bfin_serial_remove(struct platform_device *pdev)
1222 {
1223         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1224
1225
1226 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1227         gpio_free(uart->cts_pin);
1228         gpio_free(uart->rts_pin);
1229 #endif
1230
1231         platform_set_drvdata(pdev, NULL);
1232
1233         if (uart)
1234                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1235
1236         return 0;
1237 }
1238
1239 static struct platform_driver bfin_serial_driver = {
1240         .probe          = bfin_serial_probe,
1241         .remove         = bfin_serial_remove,
1242         .suspend        = bfin_serial_suspend,
1243         .resume         = bfin_serial_resume,
1244         .driver         = {
1245                 .name   = "bfin-uart",
1246         },
1247 };
1248
1249 static int __init bfin_serial_init(void)
1250 {
1251         int ret;
1252 #ifdef CONFIG_KGDB_UART
1253         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1254         struct ktermios t;
1255 #endif
1256
1257         pr_info("Serial: Blackfin serial driver\n");
1258
1259         bfin_serial_init_ports();
1260
1261         ret = uart_register_driver(&bfin_serial_reg);
1262         if (ret == 0) {
1263                 ret = platform_driver_register(&bfin_serial_driver);
1264                 if (ret) {
1265                         pr_debug("uart register failed\n");
1266                         uart_unregister_driver(&bfin_serial_reg);
1267                 }
1268         }
1269 #ifdef CONFIG_KGDB_UART
1270         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1271                 request_irq(uart->port.irq, bfin_serial_rx_int,
1272                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1273                 pr_info("Request irq for kgdb uart port\n");
1274 #ifdef CONFIG_BF54x
1275                 UART_SET_IER(uart, ERBFI);
1276 #else
1277                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1278 #endif
1279                 SSYNC();
1280                 t.c_cflag = CS8|B57600;
1281                 t.c_iflag = 0;
1282                 t.c_oflag = 0;
1283                 t.c_lflag = ICANON;
1284                 t.c_line = CONFIG_KGDB_UART_PORT;
1285                 bfin_serial_set_termios(&uart->port, &t, &t);
1286         }
1287 #endif
1288         return ret;
1289 }
1290
1291 static void __exit bfin_serial_exit(void)
1292 {
1293         platform_driver_unregister(&bfin_serial_driver);
1294         uart_unregister_driver(&bfin_serial_reg);
1295 }
1296
1297 module_init(bfin_serial_init);
1298 module_exit(bfin_serial_exit);
1299
1300 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1301 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1302 MODULE_LICENSE("GPL");
1303 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);