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