drivers/serial/bfin_5xx.c

   1 /*
   2  * File:         drivers/serial/bfin_5xx.c
   3  * Based on:     Based on drivers/serial/sa1100.c
   4  * Author:       Aubrey Li <aubrey.li@analog.com>
   5  *
   6  * Created:
   7  * Description:  Driver for blackfin 5xx serial ports
   8  *
   9  * Modified:
  10  *               Copyright 2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  31 #define SUPPORT_SYSRQ
  32 #endif
  33
  34 #include <linux/module.h>
  35 #include <linux/ioport.h>
  36 #include <linux/init.h>
  37 #include <linux/console.h>
  38 #include <linux/sysrq.h>
  39 #include <linux/platform_device.h>
  40 #include <linux/tty.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/serial_core.h>
  43
  44 #ifdef CONFIG_KGDB_UART
  45 #include <linux/kgdb.h>
  46 #include <asm/irq_regs.h>
  47 #endif
  48
  49 #include <asm/gpio.h>
  50 #include <asm/mach/bfin_serial_5xx.h>
  51
  52 #ifdef CONFIG_SERIAL_BFIN_DMA
  53 #include <linux/dma-mapping.h>
  54 #include <asm/io.h>
  55 #include <asm/irq.h>
  56 #include <asm/cacheflush.h>
  57 #endif
  58
  59 /* UART name and device definitions */
  60 #define BFIN_SERIAL_NAME        "ttyBF"
  61 #define BFIN_SERIAL_MAJOR       204
  62 #define BFIN_SERIAL_MINOR       64
  63
  64 /*
  65  * Setup for console. Argument comes from the menuconfig
  66  */
  67 #define DMA_RX_XCOUNT           512
  68 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  69
  70 #define DMA_RX_FLUSH_JIFFIES    5
  71
  72 #ifdef CONFIG_SERIAL_BFIN_DMA
  73 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  74 #else
  75 static void bfin_serial_do_work(struct work_struct *work);
  76 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  77 static void local_put_char(struct bfin_serial_port *uart, char ch);
  78 #endif
  79
  80 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
  81
  82 /*
  83  * interrupts are disabled on entry
  84  */
  85 static void bfin_serial_stop_tx(struct uart_port *port)
  86 {
  87         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  88
  89         while (!(UART_GET_LSR(uart) & TEMT))
  90                 continue;
  91
  92 #ifdef CONFIG_SERIAL_BFIN_DMA
  93         disable_dma(uart->tx_dma_channel);
  94 #else
  95 #ifdef CONFIG_BF54x
  96         /* Waiting for Transmission Finished */
  97         while (!(UART_GET_LSR(uart) & TFI))
  98                 continue;
  99         /* Clear TFI bit */
 100         UART_PUT_LSR(uart, TFI);
 101         UART_CLEAR_IER(uart, ETBEI);
 102 #else
 103         unsigned short ier;
 104
 105         ier = UART_GET_IER(uart);
 106         ier &= ~ETBEI;
 107         UART_PUT_IER(uart, ier);
 108 #endif
 109 #endif
 110 }
 111
 112 /*
 113  * port is locked and interrupts are disabled
 114  */
 115 static void bfin_serial_start_tx(struct uart_port *port)
 116 {
 117         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 118
 119 #ifdef CONFIG_SERIAL_BFIN_DMA
 120         bfin_serial_dma_tx_chars(uart);
 121 #else
 122 #ifdef CONFIG_BF54x
 123         UART_SET_IER(uart, ETBEI);
 124 #else
 125         unsigned short ier;
 126         ier = UART_GET_IER(uart);
 127         ier |= ETBEI;
 128         UART_PUT_IER(uart, ier);
 129 #endif
 130         bfin_serial_tx_chars(uart);
 131 #endif
 132 }
 133
 134 /*
 135  * Interrupts are enabled
 136  */
 137 static void bfin_serial_stop_rx(struct uart_port *port)
 138 {
 139         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 140 #ifdef  CONFIG_KGDB_UART
 141         if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 142 #endif
 143 #ifdef CONFIG_BF54x
 144         UART_CLEAR_IER(uart, ERBFI);
 145 #else
 146         unsigned short ier;
 147
 148         ier = UART_GET_IER(uart);
 149         ier &= ~ERBFI;
 150         UART_PUT_IER(uart, ier);
 151 #endif
 152 #ifdef  CONFIG_KGDB_UART
 153         }
 154 #endif
 155 }
 156
 157 /*
 158  * Set the modem control timer to fire immediately.
 159  */
 160 static void bfin_serial_enable_ms(struct uart_port *port)
 161 {
 162 }
 163
 164 #ifdef CONFIG_KGDB_UART
 165 static int kgdb_entry_state;
 166
 167 void kgdb_put_debug_char(int chr)
 168 {
 169         struct bfin_serial_port *uart;
 170
 171         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 172                 uart = &bfin_serial_ports[0];
 173         else
 174                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 175
 176         while (!(UART_GET_LSR(uart) & THRE)) {
 177                 SSYNC();
 178         }
 179
 180 #ifndef CONFIG_BF54x
 181         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 182         SSYNC();
 183 #endif
 184         UART_PUT_CHAR(uart, (unsigned char)chr);
 185         SSYNC();
 186 }
 187
 188 int kgdb_get_debug_char(void)
 189 {
 190         struct bfin_serial_port *uart;
 191         unsigned char chr;
 192
 193         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 194                 uart = &bfin_serial_ports[0];
 195         else
 196                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 197
 198         while(!(UART_GET_LSR(uart) & DR)) {
 199                 SSYNC();
 200         }
 201 #ifndef CONFIG_BF54x
 202         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 203         SSYNC();
 204 #endif
 205         chr = UART_GET_CHAR(uart);
 206         SSYNC();
 207
 208         return chr;
 209 }
 210 #endif
 211
 212 #ifdef CONFIG_SERIAL_BFIN_PIO
 213 static void local_put_char(struct bfin_serial_port *uart, char ch)
 214 {
 215         unsigned short status;
 216         int flags = 0;
 217
 218         spin_lock_irqsave(&uart->port.lock, flags);
 219
 220         do {
 221                 status = UART_GET_LSR(uart);
 222         } while (!(status & THRE));
 223
 224         UART_PUT_CHAR(uart, ch);
 225         SSYNC();
 226
 227         spin_unlock_irqrestore(&uart->port.lock, flags);
 228 }
 229
 230 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 231 {
 232         struct tty_struct *tty = uart->port.info->tty;
 233         unsigned int status, ch, flg;
 234 #ifdef CONFIG_KGDB_UART
 235         struct pt_regs *regs = get_irq_regs();
 236 #endif
 237 #ifdef BF533_FAMILY
 238         static int in_break = 0;
 239 #endif
 240
 241         status = UART_GET_LSR(uart);
 242         ch = UART_GET_CHAR(uart);
 243         uart->port.icount.rx++;
 244
 245 #ifdef CONFIG_KGDB_UART
 246         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
 247                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
 248                         kgdb_breakkey_pressed(regs);
 249                         return;
 250                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
 251                         kgdb_entry_state = 1;
 252                 } else if (kgdb_entry_state == 1 && ch == 'q') {
 253                         kgdb_entry_state = 0;
 254                         kgdb_breakkey_pressed(regs);
 255                         return;
 256                 } else if (ch == 0x3) {/* Ctrl + C */
 257                         kgdb_entry_state = 0;
 258                         kgdb_breakkey_pressed(regs);
 259                         return;
 260                 } else {
 261                         kgdb_entry_state = 0;
 262                 }
 263         }
 264 #endif
 265
 266 #ifdef BF533_FAMILY
 267         /* The BF533 family of processors have a nice misbehavior where
 268          * they continuously generate characters for a "single" break.
 269          * We have to basically ignore this flood until the "next" valid
 270          * character comes across.  All other Blackfin families operate
 271          * properly though.
 272          */
 273         if (in_break) {
 274                 if (ch != 0) {
 275                         in_break = 0;
 276                         ch = UART_GET_CHAR(uart);
 277                         if (bfin_revid() < 5)
 278                                 return;
 279                 } else
 280                         return;
 281         }
 282 #endif
 283
 284         if (status & BI) {
 285 #ifdef BF533_FAMILY
 286                 in_break = 1;
 287 #endif
 288                 uart->port.icount.brk++;
 289                 if (uart_handle_break(&uart->port))
 290                         goto ignore_char;
 291                 status &= ~(PE | FE);
 292         }
 293         if (status & PE)
 294                 uart->port.icount.parity++;
 295         if (status & OE)
 296                 uart->port.icount.overrun++;
 297         if (status & FE)
 298                 uart->port.icount.frame++;
 299
 300         status &= uart->port.read_status_mask;
 301
 302         if (status & BI)
 303                 flg = TTY_BREAK;
 304         else if (status & PE)
 305                 flg = TTY_PARITY;
 306         else if (status & FE)
 307                 flg = TTY_FRAME;
 308         else
 309                 flg = TTY_NORMAL;
 310
 311         if (uart_handle_sysrq_char(&uart->port, ch))
 312                 goto ignore_char;
 313
 314         uart_insert_char(&uart->port, status, OE, ch, flg);
 315
 316  ignore_char:
 317         tty_flip_buffer_push(tty);
 318 }
 319
 320 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 321 {
 322         struct circ_buf *xmit = &uart->port.info->xmit;
 323
 324         if (uart->port.x_char) {
 325                 UART_PUT_CHAR(uart, uart->port.x_char);
 326                 uart->port.icount.tx++;
 327                 uart->port.x_char = 0;
 328                 return;
 329         }
 330         /*
 331          * Check the modem control lines before
 332          * transmitting anything.
 333          */
 334         bfin_serial_mctrl_check(uart);
 335
 336         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 337                 bfin_serial_stop_tx(&uart->port);
 338                 return;
 339         }
 340
 341         local_put_char(uart, xmit->buf[xmit->tail]);
 342         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 343         uart->port.icount.tx++;
 344
 345         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 346                 uart_write_wakeup(&uart->port);
 347
 348         if (uart_circ_empty(xmit))
 349                 bfin_serial_stop_tx(&uart->port);
 350 }
 351
 352 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 353 {
 354         struct bfin_serial_port *uart = dev_id;
 355
 356 #ifdef CONFIG_BF54x
 357         unsigned short status;
 358         spin_lock(&uart->port.lock);
 359         status = UART_GET_LSR(uart);
 360         while ((UART_GET_IER(uart) & ERBFI) && (status & DR)) {
 361                 bfin_serial_rx_chars(uart);
 362                 status = UART_GET_LSR(uart);
 363         }
 364         spin_unlock(&uart->port.lock);
 365 #else
 366         spin_lock(&uart->port.lock);
 367         while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY)
 368                 bfin_serial_rx_chars(uart);
 369         spin_unlock(&uart->port.lock);
 370 #endif
 371         return IRQ_HANDLED;
 372 }
 373
 374 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 375 {
 376         struct bfin_serial_port *uart = dev_id;
 377
 378 #ifdef CONFIG_BF54x
 379         unsigned short status;
 380         spin_lock(&uart->port.lock);
 381         status = UART_GET_LSR(uart);
 382         while ((UART_GET_IER(uart) & ETBEI) && (status & THRE)) {
 383                 bfin_serial_tx_chars(uart);
 384                 status = UART_GET_LSR(uart);
 385         }
 386         spin_unlock(&uart->port.lock);
 387 #else
 388         spin_lock(&uart->port.lock);
 389         while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY)
 390                 bfin_serial_tx_chars(uart);
 391         spin_unlock(&uart->port.lock);
 392 #endif
 393         return IRQ_HANDLED;
 394 }
 395
 396
 397 static void bfin_serial_do_work(struct work_struct *work)
 398 {
 399         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 400
 401         bfin_serial_mctrl_check(uart);
 402 }
 403 #endif
 404
 405 #ifdef CONFIG_SERIAL_BFIN_DMA
 406 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 407 {
 408         struct circ_buf *xmit = &uart->port.info->xmit;
 409         unsigned short ier;
 410         int flags = 0;
 411
 412         if (!uart->tx_done)
 413                 return;
 414
 415         uart->tx_done = 0;
 416
 417         if (uart->port.x_char) {
 418                 UART_PUT_CHAR(uart, uart->port.x_char);
 419                 uart->port.icount.tx++;
 420                 uart->port.x_char = 0;
 421                 uart->tx_done = 1;
 422                 return;
 423         }
 424         /*
 425          * Check the modem control lines before
 426          * transmitting anything.
 427          */
 428         bfin_serial_mctrl_check(uart);
 429
 430         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 431                 bfin_serial_stop_tx(&uart->port);
 432                 uart->tx_done = 1;
 433                 return;
 434         }
 435
 436         spin_lock_irqsave(&uart->port.lock, flags);
 437         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 438         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 439                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 440         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 441                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 442         set_dma_config(uart->tx_dma_channel,
 443                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 444                         INTR_ON_BUF,
 445                         DIMENSION_LINEAR,
 446                         DATA_SIZE_8));
 447         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 448         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 449         set_dma_x_modify(uart->tx_dma_channel, 1);
 450         enable_dma(uart->tx_dma_channel);
 451 #ifdef CONFIG_BF54x
 452         UART_SET_IER(uart, ETBEI);
 453 #else
 454         ier = UART_GET_IER(uart);
 455         ier |= ETBEI;
 456         UART_PUT_IER(uart, ier);
 457 #endif
 458         spin_unlock_irqrestore(&uart->port.lock, flags);
 459 }
 460
 461 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 462 {
 463         struct tty_struct *tty = uart->port.info->tty;
 464         int i, flg, status;
 465
 466         status = UART_GET_LSR(uart);
 467         uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
 468
 469         if (status & BI) {
 470                 uart->port.icount.brk++;
 471                 if (uart_handle_break(&uart->port))
 472                         goto dma_ignore_char;
 473                 status &= ~(PE | FE);
 474         }
 475         if (status & PE)
 476                 uart->port.icount.parity++;
 477         if (status & OE)
 478                 uart->port.icount.overrun++;
 479         if (status & FE)
 480                 uart->port.icount.frame++;
 481
 482         status &= uart->port.read_status_mask;
 483
 484         if (status & BI)
 485                 flg = TTY_BREAK;
 486         else if (status & PE)
 487                 flg = TTY_PARITY;
 488         else if (status & FE)
 489                 flg = TTY_FRAME;
 490         else
 491                 flg = TTY_NORMAL;
 492
 493         for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
 494                 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 495                         goto dma_ignore_char;
 496                 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
 497         }
 498
 499  dma_ignore_char:
 500         tty_flip_buffer_push(tty);
 501 }
 502
 503 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 504 {
 505         int x_pos, pos;
 506         int flags = 0;
 507
 508         bfin_serial_dma_tx_chars(uart);
 509
 510         spin_lock_irqsave(&uart->port.lock, flags);
 511         x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
 512         if (x_pos == DMA_RX_XCOUNT)
 513                 x_pos = 0;
 514
 515         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 516
 517         if (pos>uart->rx_dma_buf.tail) {
 518                 uart->rx_dma_buf.tail = pos;
 519                 bfin_serial_dma_rx_chars(uart);
 520                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 521         }
 522         spin_unlock_irqrestore(&uart->port.lock, flags);
 523         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 524         add_timer(&(uart->rx_dma_timer));
 525 }
 526
 527 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 528 {
 529         struct bfin_serial_port *uart = dev_id;
 530         struct circ_buf *xmit = &uart->port.info->xmit;
 531         unsigned short ier;
 532
 533         spin_lock(&uart->port.lock);
 534         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 535                 clear_dma_irqstat(uart->tx_dma_channel);
 536                 disable_dma(uart->tx_dma_channel);
 537 #ifdef CONFIG_BF54x
 538                 UART_CLEAR_IER(uart, ETBEI);
 539 #else
 540                 ier = UART_GET_IER(uart);
 541                 ier &= ~ETBEI;
 542                 UART_PUT_IER(uart, ier);
 543 #endif
 544                 xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1);
 545                 uart->port.icount.tx+=uart->tx_count;
 546
 547                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 548                         uart_write_wakeup(&uart->port);
 549
 550                 if (uart_circ_empty(xmit))
 551                         bfin_serial_stop_tx(&uart->port);
 552                 uart->tx_done = 1;
 553         }
 554
 555         spin_unlock(&uart->port.lock);
 556         return IRQ_HANDLED;
 557 }
 558
 559 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 560 {
 561         struct bfin_serial_port *uart = dev_id;
 562         unsigned short irqstat;
 563
 564         uart->rx_dma_nrows++;
 565         if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
 566                 uart->rx_dma_nrows = 0;
 567                 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
 568                 bfin_serial_dma_rx_chars(uart);
 569                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
 570         }
 571         spin_lock(&uart->port.lock);
 572         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 573         clear_dma_irqstat(uart->rx_dma_channel);
 574
 575         spin_unlock(&uart->port.lock);
 576         return IRQ_HANDLED;
 577 }
 578 #endif
 579
 580 /*
 581  * Return TIOCSER_TEMT when transmitter is not busy.
 582  */
 583 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 584 {
 585         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 586         unsigned short lsr;
 587
 588         lsr = UART_GET_LSR(uart);
 589         if (lsr & TEMT)
 590                 return TIOCSER_TEMT;
 591         else
 592                 return 0;
 593 }
 594
 595 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 596 {
 597 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 598         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 599         if (uart->cts_pin < 0)
 600                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 601
 602         if (gpio_get_value(uart->cts_pin))
 603                 return TIOCM_DSR | TIOCM_CAR;
 604         else
 605 #endif
 606                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 607 }
 608
 609 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 610 {
 611 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 612         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 613         if (uart->rts_pin < 0)
 614                 return;
 615
 616         if (mctrl & TIOCM_RTS)
 617                 gpio_set_value(uart->rts_pin, 0);
 618         else
 619                 gpio_set_value(uart->rts_pin, 1);
 620 #endif
 621 }
 622
 623 /*
 624  * Handle any change of modem status signal since we were last called.
 625  */
 626 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 627 {
 628 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 629         unsigned int status;
 630 # ifdef CONFIG_SERIAL_BFIN_DMA
 631         struct uart_info *info = uart->port.info;
 632         struct tty_struct *tty = info->tty;
 633
 634         status = bfin_serial_get_mctrl(&uart->port);
 635         if (!(status & TIOCM_CTS)) {
 636                 tty->hw_stopped = 1;
 637         } else {
 638                 tty->hw_stopped = 0;
 639         }
 640 # else
 641         status = bfin_serial_get_mctrl(&uart->port);
 642         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 643         if (!(status & TIOCM_CTS))
 644                 schedule_work(&uart->cts_workqueue);
 645 # endif
 646 #endif
 647 }
 648
 649 /*
 650  * Interrupts are always disabled.
 651  */
 652 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 653 {
 654         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 655         u16 lcr = UART_GET_LCR(uart);
 656         if (break_state)
 657                 lcr |= SB;
 658         else
 659                 lcr &= ~SB;
 660         UART_PUT_LCR(uart, lcr);
 661         SSYNC();
 662 }
 663
 664 static int bfin_serial_startup(struct uart_port *port)
 665 {
 666         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 667
 668 #ifdef CONFIG_SERIAL_BFIN_DMA
 669         dma_addr_t dma_handle;
 670
 671         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 672                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 673                 return -EBUSY;
 674         }
 675
 676         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 677                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 678                 free_dma(uart->rx_dma_channel);
 679                 return -EBUSY;
 680         }
 681
 682         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 683         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 684
 685         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 686         uart->rx_dma_buf.head = 0;
 687         uart->rx_dma_buf.tail = 0;
 688         uart->rx_dma_nrows = 0;
 689
 690         set_dma_config(uart->rx_dma_channel,
 691                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 692                                 INTR_ON_ROW, DIMENSION_2D,
 693                                 DATA_SIZE_8));
 694         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 695         set_dma_x_modify(uart->rx_dma_channel, 1);
 696         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 697         set_dma_y_modify(uart->rx_dma_channel, 1);
 698         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 699         enable_dma(uart->rx_dma_channel);
 700
 701         uart->rx_dma_timer.data = (unsigned long)(uart);
 702         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 703         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 704         add_timer(&(uart->rx_dma_timer));
 705 #else
 706         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 707              "BFIN_UART_RX", uart)) {
 708 # ifdef CONFIG_KGDB_UART
 709                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 710 # endif
 711                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 712                 return -EBUSY;
 713 # ifdef CONFIG_KGDB_UART
 714                 }
 715 # endif
 716         }
 717
 718
 719         if (request_irq
 720             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 721              "BFIN_UART_TX", uart)) {
 722                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 723                 free_irq(uart->port.irq, uart);
 724                 return -EBUSY;
 725         }
 726 #endif
 727 #ifdef CONFIG_BF54x
 728         UART_SET_IER(uart, ERBFI);
 729 #else
 730         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 731 #endif
 732         return 0;
 733 }
 734
 735 static void bfin_serial_shutdown(struct uart_port *port)
 736 {
 737         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 738
 739 #ifdef CONFIG_SERIAL_BFIN_DMA
 740         disable_dma(uart->tx_dma_channel);
 741         free_dma(uart->tx_dma_channel);
 742         disable_dma(uart->rx_dma_channel);
 743         free_dma(uart->rx_dma_channel);
 744         del_timer(&(uart->rx_dma_timer));
 745 #else
 746 #ifdef  CONFIG_KGDB_UART
 747         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 748 #endif
 749         free_irq(uart->port.irq, uart);
 750         free_irq(uart->port.irq+1, uart);
 751 #endif
 752 }
 753
 754 static void
 755 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 756                    struct ktermios *old)
 757 {
 758         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 759         unsigned long flags;
 760         unsigned int baud, quot;
 761         unsigned short val, ier, lsr, lcr = 0;
 762
 763         switch (termios->c_cflag & CSIZE) {
 764         case CS8:
 765                 lcr = WLS(8);
 766                 break;
 767         case CS7:
 768                 lcr = WLS(7);
 769                 break;
 770         case CS6:
 771                 lcr = WLS(6);
 772                 break;
 773         case CS5:
 774                 lcr = WLS(5);
 775                 break;
 776         default:
 777                 printk(KERN_ERR "%s: word lengh not supported\n",
 778                         __FUNCTION__);
 779         }
 780
 781         if (termios->c_cflag & CSTOPB)
 782                 lcr |= STB;
 783         if (termios->c_cflag & PARENB)
 784                 lcr |= PEN;
 785         if (!(termios->c_cflag & PARODD))
 786                 lcr |= EPS;
 787         if (termios->c_cflag & CMSPAR)
 788                 lcr |= STP;
 789
 790         port->read_status_mask = OE;
 791         if (termios->c_iflag & INPCK)
 792                 port->read_status_mask |= (FE | PE);
 793         if (termios->c_iflag & (BRKINT | PARMRK))
 794                 port->read_status_mask |= BI;
 795
 796         /*
 797          * Characters to ignore
 798          */
 799         port->ignore_status_mask = 0;
 800         if (termios->c_iflag & IGNPAR)
 801                 port->ignore_status_mask |= FE | PE;
 802         if (termios->c_iflag & IGNBRK) {
 803                 port->ignore_status_mask |= BI;
 804                 /*
 805                  * If we're ignoring parity and break indicators,
 806                  * ignore overruns too (for real raw support).
 807                  */
 808                 if (termios->c_iflag & IGNPAR)
 809                         port->ignore_status_mask |= OE;
 810         }
 811
 812         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 813         quot = uart_get_divisor(port, baud);
 814         spin_lock_irqsave(&uart->port.lock, flags);
 815
 816         do {
 817                 lsr = UART_GET_LSR(uart);
 818         } while (!(lsr & TEMT));
 819
 820         /* Disable UART */
 821         ier = UART_GET_IER(uart);
 822 #ifdef CONFIG_BF54x
 823         UART_CLEAR_IER(uart, 0xF);
 824 #else
 825         UART_PUT_IER(uart, 0);
 826 #endif
 827
 828 #ifndef CONFIG_BF54x
 829         /* Set DLAB in LCR to Access DLL and DLH */
 830         val = UART_GET_LCR(uart);
 831         val |= DLAB;
 832         UART_PUT_LCR(uart, val);
 833         SSYNC();
 834 #endif
 835
 836         UART_PUT_DLL(uart, quot & 0xFF);
 837         SSYNC();
 838         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 839         SSYNC();
 840
 841 #ifndef CONFIG_BF54x
 842         /* Clear DLAB in LCR to Access THR RBR IER */
 843         val = UART_GET_LCR(uart);
 844         val &= ~DLAB;
 845         UART_PUT_LCR(uart, val);
 846         SSYNC();
 847 #endif
 848
 849         UART_PUT_LCR(uart, lcr);
 850
 851         /* Enable UART */
 852 #ifdef CONFIG_BF54x
 853         UART_SET_IER(uart, ier);
 854 #else
 855         UART_PUT_IER(uart, ier);
 856 #endif
 857
 858         val = UART_GET_GCTL(uart);
 859         val |= UCEN;
 860         UART_PUT_GCTL(uart, val);
 861
 862         spin_unlock_irqrestore(&uart->port.lock, flags);
 863 }
 864
 865 static const char *bfin_serial_type(struct uart_port *port)
 866 {
 867         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 868
 869         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 870 }
 871
 872 /*
 873  * Release the memory region(s) being used by 'port'.
 874  */
 875 static void bfin_serial_release_port(struct uart_port *port)
 876 {
 877 }
 878
 879 /*
 880  * Request the memory region(s) being used by 'port'.
 881  */
 882 static int bfin_serial_request_port(struct uart_port *port)
 883 {
 884         return 0;
 885 }
 886
 887 /*
 888  * Configure/autoconfigure the port.
 889  */
 890 static void bfin_serial_config_port(struct uart_port *port, int flags)
 891 {
 892         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 893
 894         if (flags & UART_CONFIG_TYPE &&
 895             bfin_serial_request_port(&uart->port) == 0)
 896                 uart->port.type = PORT_BFIN;
 897 }
 898
 899 /*
 900  * Verify the new serial_struct (for TIOCSSERIAL).
 901  * The only change we allow are to the flags and type, and
 902  * even then only between PORT_BFIN and PORT_UNKNOWN
 903  */
 904 static int
 905 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 906 {
 907         return 0;
 908 }
 909
 910 static struct uart_ops bfin_serial_pops = {
 911         .tx_empty       = bfin_serial_tx_empty,
 912         .set_mctrl      = bfin_serial_set_mctrl,
 913         .get_mctrl      = bfin_serial_get_mctrl,
 914         .stop_tx        = bfin_serial_stop_tx,
 915         .start_tx       = bfin_serial_start_tx,
 916         .stop_rx        = bfin_serial_stop_rx,
 917         .enable_ms      = bfin_serial_enable_ms,
 918         .break_ctl      = bfin_serial_break_ctl,
 919         .startup        = bfin_serial_startup,
 920         .shutdown       = bfin_serial_shutdown,
 921         .set_termios    = bfin_serial_set_termios,
 922         .type           = bfin_serial_type,
 923         .release_port   = bfin_serial_release_port,
 924         .request_port   = bfin_serial_request_port,
 925         .config_port    = bfin_serial_config_port,
 926         .verify_port    = bfin_serial_verify_port,
 927 };
 928
 929 static void __init bfin_serial_init_ports(void)
 930 {
 931         static int first = 1;
 932         int i;
 933
 934         if (!first)
 935                 return;
 936         first = 0;
 937
 938         for (i = 0; i < nr_ports; i++) {
 939                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 940                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 941                 bfin_serial_ports[i].port.line      = i;
 942                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 943                 bfin_serial_ports[i].port.membase   =
 944                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 945                 bfin_serial_ports[i].port.mapbase   =
 946                         bfin_serial_resource[i].uart_base_addr;
 947                 bfin_serial_ports[i].port.irq       =
 948                         bfin_serial_resource[i].uart_irq;
 949                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 950 #ifdef CONFIG_SERIAL_BFIN_DMA
 951                 bfin_serial_ports[i].tx_done        = 1;
 952                 bfin_serial_ports[i].tx_count       = 0;
 953                 bfin_serial_ports[i].tx_dma_channel =
 954                         bfin_serial_resource[i].uart_tx_dma_channel;
 955                 bfin_serial_ports[i].rx_dma_channel =
 956                         bfin_serial_resource[i].uart_rx_dma_channel;
 957                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 958 #else
 959                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 960 #endif
 961 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 962                 bfin_serial_ports[i].cts_pin        =
 963                         bfin_serial_resource[i].uart_cts_pin;
 964                 bfin_serial_ports[i].rts_pin        =
 965                         bfin_serial_resource[i].uart_rts_pin;
 966 #endif
 967                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 968         }
 969
 970 }
 971
 972 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 973 /*
 974  * If the port was already initialised (eg, by a boot loader),
 975  * try to determine the current setup.
 976  */
 977 static void __init
 978 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 979                            int *parity, int *bits)
 980 {
 981         unsigned short status;
 982
 983         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 984         if (status == (ERBFI | ETBEI)) {
 985                 /* ok, the port was enabled */
 986                 unsigned short lcr, val;
 987                 unsigned short dlh, dll;
 988
 989                 lcr = UART_GET_LCR(uart);
 990
 991                 *parity = 'n';
 992                 if (lcr & PEN) {
 993                         if (lcr & EPS)
 994                                 *parity = 'e';
 995                         else
 996                                 *parity = 'o';
 997                 }
 998                 switch (lcr & 0x03) {
 999                         case 0: *bits = 5; break;
1000                         case 1: *bits = 6; break;
1001                         case 2: *bits = 7; break;
1002                         case 3: *bits = 8; break;
1003                 }
1004 #ifndef CONFIG_BF54x
1005                 /* Set DLAB in LCR to Access DLL and DLH */
1006                 val = UART_GET_LCR(uart);
1007                 val |= DLAB;
1008                 UART_PUT_LCR(uart, val);
1009 #endif
1010
1011                 dll = UART_GET_DLL(uart);
1012                 dlh = UART_GET_DLH(uart);
1013
1014 #ifndef CONFIG_BF54x
1015                 /* Clear DLAB in LCR to Access THR RBR IER */
1016                 val = UART_GET_LCR(uart);
1017                 val &= ~DLAB;
1018                 UART_PUT_LCR(uart, val);
1019 #endif
1020
1021                 *baud = get_sclk() / (16*(dll | dlh << 8));
1022         }
1023         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1024 }
1025 #endif
1026
1027 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1028 static struct uart_driver bfin_serial_reg;
1029
1030 static int __init
1031 bfin_serial_console_setup(struct console *co, char *options)
1032 {
1033         struct bfin_serial_port *uart;
1034 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1035         int baud = 57600;
1036         int bits = 8;
1037         int parity = 'n';
1038 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1039         int flow = 'r';
1040 #  else
1041         int flow = 'n';
1042 #  endif
1043 # endif
1044
1045         /*
1046          * Check whether an invalid uart number has been specified, and
1047          * if so, search for the first available port that does have
1048          * console support.
1049          */
1050         if (co->index == -1 || co->index >= nr_ports)
1051                 co->index = 0;
1052         uart = &bfin_serial_ports[co->index];
1053
1054 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1055         if (options)
1056                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1057         else
1058                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1059
1060         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1061 # else
1062         return 0;
1063 # endif
1064 }
1065 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1066                                  defined (CONFIG_EARLY_PRINTK) */
1067
1068 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1069 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1070 {
1071         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1072         while (!(UART_GET_LSR(uart) & THRE))
1073                 barrier();
1074         UART_PUT_CHAR(uart, ch);
1075         SSYNC();
1076 }
1077
1078 /*
1079  * Interrupts are disabled on entering
1080  */
1081 static void
1082 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1083 {
1084         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1085         int flags = 0;
1086
1087         spin_lock_irqsave(&uart->port.lock, flags);
1088         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1089         spin_unlock_irqrestore(&uart->port.lock, flags);
1090
1091 }
1092
1093 static struct console bfin_serial_console = {
1094         .name           = BFIN_SERIAL_NAME,
1095         .write          = bfin_serial_console_write,
1096         .device         = uart_console_device,
1097         .setup          = bfin_serial_console_setup,
1098         .flags          = CON_PRINTBUFFER,
1099         .index          = -1,
1100         .data           = &bfin_serial_reg,
1101 };
1102
1103 static int __init bfin_serial_rs_console_init(void)
1104 {
1105         bfin_serial_init_ports();
1106         register_console(&bfin_serial_console);
1107 #ifdef CONFIG_KGDB_UART
1108         kgdb_entry_state = 0;
1109         init_kgdb_uart();
1110 #endif
1111         return 0;
1112 }
1113 console_initcall(bfin_serial_rs_console_init);
1114
1115 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1116 #else
1117 #define BFIN_SERIAL_CONSOLE     NULL
1118 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1119
1120
1121 #ifdef CONFIG_EARLY_PRINTK
1122 static __init void early_serial_putc(struct uart_port *port, int ch)
1123 {
1124         unsigned timeout = 0xffff;
1125         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1126
1127         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1128                 cpu_relax();
1129         UART_PUT_CHAR(uart, ch);
1130 }
1131
1132 static __init void early_serial_write(struct console *con, const char *s,
1133                                         unsigned int n)
1134 {
1135         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1136         unsigned int i;
1137
1138         for (i = 0; i < n; i++, s++) {
1139                 if (*s == '\n')
1140                         early_serial_putc(&uart->port, '\r');
1141                 early_serial_putc(&uart->port, *s);
1142         }
1143 }
1144
1145 static struct __init console bfin_early_serial_console = {
1146         .name = "early_BFuart",
1147         .write = early_serial_write,
1148         .device = uart_console_device,
1149         .flags = CON_PRINTBUFFER,
1150         .setup = bfin_serial_console_setup,
1151         .index = -1,
1152         .data  = &bfin_serial_reg,
1153 };
1154
1155 struct console __init *bfin_earlyserial_init(unsigned int port,
1156                                                 unsigned int cflag)
1157 {
1158         struct bfin_serial_port *uart;
1159         struct ktermios t;
1160
1161         if (port == -1 || port >= nr_ports)
1162                 port = 0;
1163         bfin_serial_init_ports();
1164         bfin_early_serial_console.index = port;
1165         uart = &bfin_serial_ports[port];
1166         t.c_cflag = cflag;
1167         t.c_iflag = 0;
1168         t.c_oflag = 0;
1169         t.c_lflag = ICANON;
1170         t.c_line = port;
1171         bfin_serial_set_termios(&uart->port, &t, &t);
1172         return &bfin_early_serial_console;
1173 }
1174
1175 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1176
1177 static struct uart_driver bfin_serial_reg = {
1178         .owner                  = THIS_MODULE,
1179         .driver_name            = "bfin-uart",
1180         .dev_name               = BFIN_SERIAL_NAME,
1181         .major                  = BFIN_SERIAL_MAJOR,
1182         .minor                  = BFIN_SERIAL_MINOR,
1183         .nr                     = NR_PORTS,
1184         .cons                   = BFIN_SERIAL_CONSOLE,
1185 };
1186
1187 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1188 {
1189         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1190
1191         if (uart)
1192                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1193
1194         return 0;
1195 }
1196
1197 static int bfin_serial_resume(struct platform_device *dev)
1198 {
1199         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1200
1201         if (uart)
1202                 uart_resume_port(&bfin_serial_reg, &uart->port);
1203
1204         return 0;
1205 }
1206
1207 static int bfin_serial_probe(struct platform_device *dev)
1208 {
1209         struct resource *res = dev->resource;
1210         int i;
1211
1212         for (i = 0; i < dev->num_resources; i++, res++)
1213                 if (res->flags & IORESOURCE_MEM)
1214                         break;
1215
1216         if (i < dev->num_resources) {
1217                 for (i = 0; i < nr_ports; i++, res++) {
1218                         if (bfin_serial_ports[i].port.mapbase != res->start)
1219                                 continue;
1220                         bfin_serial_ports[i].port.dev = &dev->dev;
1221                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1222                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1223                 }
1224         }
1225
1226         return 0;
1227 }
1228
1229 static int bfin_serial_remove(struct platform_device *pdev)
1230 {
1231         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1232
1233
1234 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1235         gpio_free(uart->cts_pin);
1236         gpio_free(uart->rts_pin);
1237 #endif
1238
1239         platform_set_drvdata(pdev, NULL);
1240
1241         if (uart)
1242                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1243
1244         return 0;
1245 }
1246
1247 static struct platform_driver bfin_serial_driver = {
1248         .probe          = bfin_serial_probe,
1249         .remove         = bfin_serial_remove,
1250         .suspend        = bfin_serial_suspend,
1251         .resume         = bfin_serial_resume,
1252         .driver         = {
1253                 .name   = "bfin-uart",
1254         },
1255 };
1256
1257 static int __init bfin_serial_init(void)
1258 {
1259         int ret;
1260 #ifdef CONFIG_KGDB_UART
1261         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1262         struct ktermios t;
1263 #endif
1264
1265         pr_info("Serial: Blackfin serial driver\n");
1266
1267         bfin_serial_init_ports();
1268
1269         ret = uart_register_driver(&bfin_serial_reg);
1270         if (ret == 0) {
1271                 ret = platform_driver_register(&bfin_serial_driver);
1272                 if (ret) {
1273                         pr_debug("uart register failed\n");
1274                         uart_unregister_driver(&bfin_serial_reg);
1275                 }
1276         }
1277 #ifdef CONFIG_KGDB_UART
1278         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1279                 request_irq(uart->port.irq, bfin_serial_rx_int,
1280                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1281                 pr_info("Request irq for kgdb uart port\n");
1282 #ifdef CONFIG_BF54x
1283                 UART_SET_IER(uart, ERBFI);
1284 #else
1285                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1286 #endif
1287                 SSYNC();
1288                 t.c_cflag = CS8|B57600;
1289                 t.c_iflag = 0;
1290                 t.c_oflag = 0;
1291                 t.c_lflag = ICANON;
1292                 t.c_line = CONFIG_KGDB_UART_PORT;
1293                 bfin_serial_set_termios(&uart->port, &t, &t);
1294         }
1295 #endif
1296         return ret;
1297 }
1298
1299 static void __exit bfin_serial_exit(void)
1300 {
1301         platform_driver_unregister(&bfin_serial_driver);
1302         uart_unregister_driver(&bfin_serial_reg);
1303 }
1304
1305 module_init(bfin_serial_init);
1306 module_exit(bfin_serial_exit);
1307
1308 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1309 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1310 MODULE_LICENSE("GPL");
1311 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);