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