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   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         static int in_break = 0;
 235 #ifdef CONFIG_KGDB_UART
 236         struct pt_regs *regs = get_irq_regs();
 237 #endif
 238
 239         status = UART_GET_LSR(uart);
 240         ch = UART_GET_CHAR(uart);
 241         uart->port.icount.rx++;
 242
 243 #ifdef CONFIG_KGDB_UART
 244         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
 245                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
 246                         kgdb_breakkey_pressed(regs);
 247                         return;
 248                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
 249                         kgdb_entry_state = 1;
 250                 } else if (kgdb_entry_state == 1 && ch == 'q') {
 251                         kgdb_entry_state = 0;
 252                         kgdb_breakkey_pressed(regs);
 253                         return;
 254                 } else if (ch == 0x3) {/* Ctrl + C */
 255                         kgdb_entry_state = 0;
 256                         kgdb_breakkey_pressed(regs);
 257                         return;
 258                 } else {
 259                         kgdb_entry_state = 0;
 260                 }
 261         }
 262 #endif
 263
 264         if (ANOMALY_05000230) {
 265                 /* The BF533 family of processors have a nice misbehavior where
 266                  * they continuously generate characters for a "single" break.
 267                  * We have to basically ignore this flood until the "next" valid
 268                  * character comes across.  All other Blackfin families operate
 269                  * properly though.
 270                  * Note: While Anomaly 05000230 does not directly address this,
 271                  *       the changes that went in for it also fixed this issue.
 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         }
 283
 284         if (status & BI) {
 285                 if (ANOMALY_05000230)
 286                         in_break = 1;
 287                 uart->port.icount.brk++;
 288                 if (uart_handle_break(&uart->port))
 289                         goto ignore_char;
 290                 status &= ~(PE | FE);
 291         }
 292         if (status & PE)
 293                 uart->port.icount.parity++;
 294         if (status & OE)
 295                 uart->port.icount.overrun++;
 296         if (status & FE)
 297                 uart->port.icount.frame++;
 298
 299         status &= uart->port.read_status_mask;
 300
 301         if (status & BI)
 302                 flg = TTY_BREAK;
 303         else if (status & PE)
 304                 flg = TTY_PARITY;
 305         else if (status & FE)
 306                 flg = TTY_FRAME;
 307         else
 308                 flg = TTY_NORMAL;
 309
 310         if (uart_handle_sysrq_char(&uart->port, ch))
 311                 goto ignore_char;
 312
 313         uart_insert_char(&uart->port, status, OE, ch, flg);
 314
 315  ignore_char:
 316         tty_flip_buffer_push(tty);
 317 }
 318
 319 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 320 {
 321         struct circ_buf *xmit = &uart->port.info->xmit;
 322
 323         if (uart->port.x_char) {
 324                 UART_PUT_CHAR(uart, uart->port.x_char);
 325                 uart->port.icount.tx++;
 326                 uart->port.x_char = 0;
 327                 return;
 328         }
 329         /*
 330          * Check the modem control lines before
 331          * transmitting anything.
 332          */
 333         bfin_serial_mctrl_check(uart);
 334
 335         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 336                 bfin_serial_stop_tx(&uart->port);
 337                 return;
 338         }
 339
 340         local_put_char(uart, xmit->buf[xmit->tail]);
 341         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 342         uart->port.icount.tx++;
 343
 344         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 345                 uart_write_wakeup(&uart->port);
 346
 347         if (uart_circ_empty(xmit))
 348                 bfin_serial_stop_tx(&uart->port);
 349 }
 350
 351 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 352 {
 353         struct bfin_serial_port *uart = dev_id;
 354
 355 #ifdef CONFIG_BF54x
 356         unsigned short status;
 357         spin_lock(&uart->port.lock);
 358         status = UART_GET_LSR(uart);
 359         while ((UART_GET_IER(uart) & ERBFI) && (status & DR)) {
 360                 bfin_serial_rx_chars(uart);
 361                 status = UART_GET_LSR(uart);
 362         }
 363         spin_unlock(&uart->port.lock);
 364 #else
 365         spin_lock(&uart->port.lock);
 366         while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY)
 367                 bfin_serial_rx_chars(uart);
 368         spin_unlock(&uart->port.lock);
 369 #endif
 370         return IRQ_HANDLED;
 371 }
 372
 373 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 374 {
 375         struct bfin_serial_port *uart = dev_id;
 376
 377 #ifdef CONFIG_BF54x
 378         unsigned short status;
 379         spin_lock(&uart->port.lock);
 380         status = UART_GET_LSR(uart);
 381         while ((UART_GET_IER(uart) & ETBEI) && (status & THRE)) {
 382                 bfin_serial_tx_chars(uart);
 383                 status = UART_GET_LSR(uart);
 384         }
 385         spin_unlock(&uart->port.lock);
 386 #else
 387         spin_lock(&uart->port.lock);
 388         while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY)
 389                 bfin_serial_tx_chars(uart);
 390         spin_unlock(&uart->port.lock);
 391 #endif
 392         return IRQ_HANDLED;
 393 }
 394
 395
 396 static void bfin_serial_do_work(struct work_struct *work)
 397 {
 398         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 399
 400         bfin_serial_mctrl_check(uart);
 401 }
 402 #endif
 403
 404 #ifdef CONFIG_SERIAL_BFIN_DMA
 405 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 406 {
 407         struct circ_buf *xmit = &uart->port.info->xmit;
 408         unsigned short ier;
 409         int flags = 0;
 410
 411         if (!uart->tx_done)
 412                 return;
 413
 414         uart->tx_done = 0;
 415
 416         if (uart->port.x_char) {
 417                 UART_PUT_CHAR(uart, uart->port.x_char);
 418                 uart->port.icount.tx++;
 419                 uart->port.x_char = 0;
 420                 uart->tx_done = 1;
 421                 return;
 422         }
 423         /*
 424          * Check the modem control lines before
 425          * transmitting anything.
 426          */
 427         bfin_serial_mctrl_check(uart);
 428
 429         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 430                 bfin_serial_stop_tx(&uart->port);
 431                 uart->tx_done = 1;
 432                 return;
 433         }
 434
 435         spin_lock_irqsave(&uart->port.lock, flags);
 436         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 437         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 438                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 439         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 440                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 441         set_dma_config(uart->tx_dma_channel,
 442                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 443                         INTR_ON_BUF,
 444                         DIMENSION_LINEAR,
 445                         DATA_SIZE_8,
 446                         DMA_SYNC_RESTART));
 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                                 DMA_SYNC_RESTART));
 695         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 696         set_dma_x_modify(uart->rx_dma_channel, 1);
 697         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 698         set_dma_y_modify(uart->rx_dma_channel, 1);
 699         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 700         enable_dma(uart->rx_dma_channel);
 701
 702         uart->rx_dma_timer.data = (unsigned long)(uart);
 703         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 704         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 705         add_timer(&(uart->rx_dma_timer));
 706 #else
 707         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 708              "BFIN_UART_RX", uart)) {
 709 # ifdef CONFIG_KGDB_UART
 710                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 711 # endif
 712                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 713                 return -EBUSY;
 714 # ifdef CONFIG_KGDB_UART
 715                 }
 716 # endif
 717         }
 718
 719
 720         if (request_irq
 721             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 722              "BFIN_UART_TX", uart)) {
 723                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 724                 free_irq(uart->port.irq, uart);
 725                 return -EBUSY;
 726         }
 727 #endif
 728 #ifdef CONFIG_BF54x
 729         UART_SET_IER(uart, ERBFI);
 730 #else
 731         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 732 #endif
 733         return 0;
 734 }
 735
 736 static void bfin_serial_shutdown(struct uart_port *port)
 737 {
 738         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 739
 740 #ifdef CONFIG_SERIAL_BFIN_DMA
 741         disable_dma(uart->tx_dma_channel);
 742         free_dma(uart->tx_dma_channel);
 743         disable_dma(uart->rx_dma_channel);
 744         free_dma(uart->rx_dma_channel);
 745         del_timer(&(uart->rx_dma_timer));
 746 #else
 747 #ifdef  CONFIG_KGDB_UART
 748         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 749 #endif
 750         free_irq(uart->port.irq, uart);
 751         free_irq(uart->port.irq+1, uart);
 752 #endif
 753 }
 754
 755 static void
 756 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 757                    struct ktermios *old)
 758 {
 759         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 760         unsigned long flags;
 761         unsigned int baud, quot;
 762         unsigned short val, ier, lsr, lcr = 0;
 763
 764         switch (termios->c_cflag & CSIZE) {
 765         case CS8:
 766                 lcr = WLS(8);
 767                 break;
 768         case CS7:
 769                 lcr = WLS(7);
 770                 break;
 771         case CS6:
 772                 lcr = WLS(6);
 773                 break;
 774         case CS5:
 775                 lcr = WLS(5);
 776                 break;
 777         default:
 778                 printk(KERN_ERR "%s: word lengh not supported\n",
 779                         __FUNCTION__);
 780         }
 781
 782         if (termios->c_cflag & CSTOPB)
 783                 lcr |= STB;
 784         if (termios->c_cflag & PARENB)
 785                 lcr |= PEN;
 786         if (!(termios->c_cflag & PARODD))
 787                 lcr |= EPS;
 788         if (termios->c_cflag & CMSPAR)
 789                 lcr |= STP;
 790
 791         port->read_status_mask = OE;
 792         if (termios->c_iflag & INPCK)
 793                 port->read_status_mask |= (FE | PE);
 794         if (termios->c_iflag & (BRKINT | PARMRK))
 795                 port->read_status_mask |= BI;
 796
 797         /*
 798          * Characters to ignore
 799          */
 800         port->ignore_status_mask = 0;
 801         if (termios->c_iflag & IGNPAR)
 802                 port->ignore_status_mask |= FE | PE;
 803         if (termios->c_iflag & IGNBRK) {
 804                 port->ignore_status_mask |= BI;
 805                 /*
 806                  * If we're ignoring parity and break indicators,
 807                  * ignore overruns too (for real raw support).
 808                  */
 809                 if (termios->c_iflag & IGNPAR)
 810                         port->ignore_status_mask |= OE;
 811         }
 812
 813         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 814         quot = uart_get_divisor(port, baud);
 815         spin_lock_irqsave(&uart->port.lock, flags);
 816
 817         do {
 818                 lsr = UART_GET_LSR(uart);
 819         } while (!(lsr & TEMT));
 820
 821         /* Disable UART */
 822         ier = UART_GET_IER(uart);
 823 #ifdef CONFIG_BF54x
 824         UART_CLEAR_IER(uart, 0xF);
 825 #else
 826         UART_PUT_IER(uart, 0);
 827 #endif
 828
 829 #ifndef CONFIG_BF54x
 830         /* Set DLAB in LCR to Access DLL and DLH */
 831         val = UART_GET_LCR(uart);
 832         val |= DLAB;
 833         UART_PUT_LCR(uart, val);
 834         SSYNC();
 835 #endif
 836
 837         UART_PUT_DLL(uart, quot & 0xFF);
 838         SSYNC();
 839         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 840         SSYNC();
 841
 842 #ifndef CONFIG_BF54x
 843         /* Clear DLAB in LCR to Access THR RBR IER */
 844         val = UART_GET_LCR(uart);
 845         val &= ~DLAB;
 846         UART_PUT_LCR(uart, val);
 847         SSYNC();
 848 #endif
 849
 850         UART_PUT_LCR(uart, lcr);
 851
 852         /* Enable UART */
 853 #ifdef CONFIG_BF54x
 854         UART_SET_IER(uart, ier);
 855 #else
 856         UART_PUT_IER(uart, ier);
 857 #endif
 858
 859         val = UART_GET_GCTL(uart);
 860         val |= UCEN;
 861         UART_PUT_GCTL(uart, val);
 862
 863         spin_unlock_irqrestore(&uart->port.lock, flags);
 864 }
 865
 866 static const char *bfin_serial_type(struct uart_port *port)
 867 {
 868         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 869
 870         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 871 }
 872
 873 /*
 874  * Release the memory region(s) being used by 'port'.
 875  */
 876 static void bfin_serial_release_port(struct uart_port *port)
 877 {
 878 }
 879
 880 /*
 881  * Request the memory region(s) being used by 'port'.
 882  */
 883 static int bfin_serial_request_port(struct uart_port *port)
 884 {
 885         return 0;
 886 }
 887
 888 /*
 889  * Configure/autoconfigure the port.
 890  */
 891 static void bfin_serial_config_port(struct uart_port *port, int flags)
 892 {
 893         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 894
 895         if (flags & UART_CONFIG_TYPE &&
 896             bfin_serial_request_port(&uart->port) == 0)
 897                 uart->port.type = PORT_BFIN;
 898 }
 899
 900 /*
 901  * Verify the new serial_struct (for TIOCSSERIAL).
 902  * The only change we allow are to the flags and type, and
 903  * even then only between PORT_BFIN and PORT_UNKNOWN
 904  */
 905 static int
 906 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 907 {
 908         return 0;
 909 }
 910
 911 static struct uart_ops bfin_serial_pops = {
 912         .tx_empty       = bfin_serial_tx_empty,
 913         .set_mctrl      = bfin_serial_set_mctrl,
 914         .get_mctrl      = bfin_serial_get_mctrl,
 915         .stop_tx        = bfin_serial_stop_tx,
 916         .start_tx       = bfin_serial_start_tx,
 917         .stop_rx        = bfin_serial_stop_rx,
 918         .enable_ms      = bfin_serial_enable_ms,
 919         .break_ctl      = bfin_serial_break_ctl,
 920         .startup        = bfin_serial_startup,
 921         .shutdown       = bfin_serial_shutdown,
 922         .set_termios    = bfin_serial_set_termios,
 923         .type           = bfin_serial_type,
 924         .release_port   = bfin_serial_release_port,
 925         .request_port   = bfin_serial_request_port,
 926         .config_port    = bfin_serial_config_port,
 927         .verify_port    = bfin_serial_verify_port,
 928 };
 929
 930 static void __init bfin_serial_init_ports(void)
 931 {
 932         static int first = 1;
 933         int i;
 934
 935         if (!first)
 936                 return;
 937         first = 0;
 938
 939         for (i = 0; i < nr_ports; i++) {
 940                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 941                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 942                 bfin_serial_ports[i].port.line      = i;
 943                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 944                 bfin_serial_ports[i].port.membase   =
 945                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 946                 bfin_serial_ports[i].port.mapbase   =
 947                         bfin_serial_resource[i].uart_base_addr;
 948                 bfin_serial_ports[i].port.irq       =
 949                         bfin_serial_resource[i].uart_irq;
 950                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 951 #ifdef CONFIG_SERIAL_BFIN_DMA
 952                 bfin_serial_ports[i].tx_done        = 1;
 953                 bfin_serial_ports[i].tx_count       = 0;
 954                 bfin_serial_ports[i].tx_dma_channel =
 955                         bfin_serial_resource[i].uart_tx_dma_channel;
 956                 bfin_serial_ports[i].rx_dma_channel =
 957                         bfin_serial_resource[i].uart_rx_dma_channel;
 958                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 959 #else
 960                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 961 #endif
 962 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 963                 bfin_serial_ports[i].cts_pin        =
 964                         bfin_serial_resource[i].uart_cts_pin;
 965                 bfin_serial_ports[i].rts_pin        =
 966                         bfin_serial_resource[i].uart_rts_pin;
 967 #endif
 968                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 969         }
 970
 971 }
 972
 973 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 974 /*
 975  * If the port was already initialised (eg, by a boot loader),
 976  * try to determine the current setup.
 977  */
 978 static void __init
 979 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 980                            int *parity, int *bits)
 981 {
 982         unsigned short status;
 983
 984         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 985         if (status == (ERBFI | ETBEI)) {
 986                 /* ok, the port was enabled */
 987                 unsigned short lcr, val;
 988                 unsigned short dlh, dll;
 989
 990                 lcr = UART_GET_LCR(uart);
 991
 992                 *parity = 'n';
 993                 if (lcr & PEN) {
 994                         if (lcr & EPS)
 995                                 *parity = 'e';
 996                         else
 997                                 *parity = 'o';
 998                 }
 999                 switch (lcr & 0x03) {
1000                         case 0: *bits = 5; break;
1001                         case 1: *bits = 6; break;
1002                         case 2: *bits = 7; break;
1003                         case 3: *bits = 8; break;
1004                 }
1005 #ifndef CONFIG_BF54x
1006                 /* Set DLAB in LCR to Access DLL and DLH */
1007                 val = UART_GET_LCR(uart);
1008                 val |= DLAB;
1009                 UART_PUT_LCR(uart, val);
1010 #endif
1011
1012                 dll = UART_GET_DLL(uart);
1013                 dlh = UART_GET_DLH(uart);
1014
1015 #ifndef CONFIG_BF54x
1016                 /* Clear DLAB in LCR to Access THR RBR IER */
1017                 val = UART_GET_LCR(uart);
1018                 val &= ~DLAB;
1019                 UART_PUT_LCR(uart, val);
1020 #endif
1021
1022                 *baud = get_sclk() / (16*(dll | dlh << 8));
1023         }
1024         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1025 }
1026 #endif
1027
1028 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1029 static struct uart_driver bfin_serial_reg;
1030
1031 static int __init
1032 bfin_serial_console_setup(struct console *co, char *options)
1033 {
1034         struct bfin_serial_port *uart;
1035 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1036         int baud = 57600;
1037         int bits = 8;
1038         int parity = 'n';
1039 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1040         int flow = 'r';
1041 #  else
1042         int flow = 'n';
1043 #  endif
1044 # endif
1045
1046         /*
1047          * Check whether an invalid uart number has been specified, and
1048          * if so, search for the first available port that does have
1049          * console support.
1050          */
1051         if (co->index == -1 || co->index >= nr_ports)
1052                 co->index = 0;
1053         uart = &bfin_serial_ports[co->index];
1054
1055 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1056         if (options)
1057                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1058         else
1059                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1060
1061         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1062 # else
1063         return 0;
1064 # endif
1065 }
1066 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1067                                  defined (CONFIG_EARLY_PRINTK) */
1068
1069 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1070 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1071 {
1072         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1073         while (!(UART_GET_LSR(uart) & THRE))
1074                 barrier();
1075         UART_PUT_CHAR(uart, ch);
1076         SSYNC();
1077 }
1078
1079 /*
1080  * Interrupts are disabled on entering
1081  */
1082 static void
1083 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1084 {
1085         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1086         int flags = 0;
1087
1088         spin_lock_irqsave(&uart->port.lock, flags);
1089         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1090         spin_unlock_irqrestore(&uart->port.lock, flags);
1091
1092 }
1093
1094 static struct console bfin_serial_console = {
1095         .name           = BFIN_SERIAL_NAME,
1096         .write          = bfin_serial_console_write,
1097         .device         = uart_console_device,
1098         .setup          = bfin_serial_console_setup,
1099         .flags          = CON_PRINTBUFFER,
1100         .index          = -1,
1101         .data           = &bfin_serial_reg,
1102 };
1103
1104 static int __init bfin_serial_rs_console_init(void)
1105 {
1106         bfin_serial_init_ports();
1107         register_console(&bfin_serial_console);
1108 #ifdef CONFIG_KGDB_UART
1109         kgdb_entry_state = 0;
1110         init_kgdb_uart();
1111 #endif
1112         return 0;
1113 }
1114 console_initcall(bfin_serial_rs_console_init);
1115
1116 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1117 #else
1118 #define BFIN_SERIAL_CONSOLE     NULL
1119 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1120
1121
1122 #ifdef CONFIG_EARLY_PRINTK
1123 static __init void early_serial_putc(struct uart_port *port, int ch)
1124 {
1125         unsigned timeout = 0xffff;
1126         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1127
1128         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1129                 cpu_relax();
1130         UART_PUT_CHAR(uart, ch);
1131 }
1132
1133 static __init void early_serial_write(struct console *con, const char *s,
1134                                         unsigned int n)
1135 {
1136         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1137         unsigned int i;
1138
1139         for (i = 0; i < n; i++, s++) {
1140                 if (*s == '\n')
1141                         early_serial_putc(&uart->port, '\r');
1142                 early_serial_putc(&uart->port, *s);
1143         }
1144 }
1145
1146 static struct __init console bfin_early_serial_console = {
1147         .name = "early_BFuart",
1148         .write = early_serial_write,
1149         .device = uart_console_device,
1150         .flags = CON_PRINTBUFFER,
1151         .setup = bfin_serial_console_setup,
1152         .index = -1,
1153         .data  = &bfin_serial_reg,
1154 };
1155
1156 struct console __init *bfin_earlyserial_init(unsigned int port,
1157                                                 unsigned int cflag)
1158 {
1159         struct bfin_serial_port *uart;
1160         struct ktermios t;
1161
1162         if (port == -1 || port >= nr_ports)
1163                 port = 0;
1164         bfin_serial_init_ports();
1165         bfin_early_serial_console.index = port;
1166         uart = &bfin_serial_ports[port];
1167         t.c_cflag = cflag;
1168         t.c_iflag = 0;
1169         t.c_oflag = 0;
1170         t.c_lflag = ICANON;
1171         t.c_line = port;
1172         bfin_serial_set_termios(&uart->port, &t, &t);
1173         return &bfin_early_serial_console;
1174 }
1175
1176 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1177
1178 static struct uart_driver bfin_serial_reg = {
1179         .owner                  = THIS_MODULE,
1180         .driver_name            = "bfin-uart",
1181         .dev_name               = BFIN_SERIAL_NAME,
1182         .major                  = BFIN_SERIAL_MAJOR,
1183         .minor                  = BFIN_SERIAL_MINOR,
1184         .nr                     = NR_PORTS,
1185         .cons                   = BFIN_SERIAL_CONSOLE,
1186 };
1187
1188 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1189 {
1190         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1191
1192         if (uart)
1193                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1194
1195         return 0;
1196 }
1197
1198 static int bfin_serial_resume(struct platform_device *dev)
1199 {
1200         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1201
1202         if (uart)
1203                 uart_resume_port(&bfin_serial_reg, &uart->port);
1204
1205         return 0;
1206 }
1207
1208 static int bfin_serial_probe(struct platform_device *dev)
1209 {
1210         struct resource *res = dev->resource;
1211         int i;
1212
1213         for (i = 0; i < dev->num_resources; i++, res++)
1214                 if (res->flags & IORESOURCE_MEM)
1215                         break;
1216
1217         if (i < dev->num_resources) {
1218                 for (i = 0; i < nr_ports; i++, res++) {
1219                         if (bfin_serial_ports[i].port.mapbase != res->start)
1220                                 continue;
1221                         bfin_serial_ports[i].port.dev = &dev->dev;
1222                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1223                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1224                 }
1225         }
1226
1227         return 0;
1228 }
1229
1230 static int bfin_serial_remove(struct platform_device *pdev)
1231 {
1232         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1233
1234
1235 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1236         gpio_free(uart->cts_pin);
1237         gpio_free(uart->rts_pin);
1238 #endif
1239
1240         platform_set_drvdata(pdev, NULL);
1241
1242         if (uart)
1243                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1244
1245         return 0;
1246 }
1247
1248 static struct platform_driver bfin_serial_driver = {
1249         .probe          = bfin_serial_probe,
1250         .remove         = bfin_serial_remove,
1251         .suspend        = bfin_serial_suspend,
1252         .resume         = bfin_serial_resume,
1253         .driver         = {
1254                 .name   = "bfin-uart",
1255         },
1256 };
1257
1258 static int __init bfin_serial_init(void)
1259 {
1260         int ret;
1261 #ifdef CONFIG_KGDB_UART
1262         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1263         struct ktermios t;
1264 #endif
1265
1266         pr_info("Serial: Blackfin serial driver\n");
1267
1268         bfin_serial_init_ports();
1269
1270         ret = uart_register_driver(&bfin_serial_reg);
1271         if (ret == 0) {
1272                 ret = platform_driver_register(&bfin_serial_driver);
1273                 if (ret) {
1274                         pr_debug("uart register failed\n");
1275                         uart_unregister_driver(&bfin_serial_reg);
1276                 }
1277         }
1278 #ifdef CONFIG_KGDB_UART
1279         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1280                 request_irq(uart->port.irq, bfin_serial_rx_int,
1281                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1282                 pr_info("Request irq for kgdb uart port\n");
1283 #ifdef CONFIG_BF54x
1284                 UART_SET_IER(uart, ERBFI);
1285 #else
1286                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1287 #endif
1288                 SSYNC();
1289                 t.c_cflag = CS8|B57600;
1290                 t.c_iflag = 0;
1291                 t.c_oflag = 0;
1292                 t.c_lflag = ICANON;
1293                 t.c_line = CONFIG_KGDB_UART_PORT;
1294                 bfin_serial_set_termios(&uart->port, &t, &t);
1295         }
1296 #endif
1297         return ret;
1298 }
1299
1300 static void __exit bfin_serial_exit(void)
1301 {
1302         platform_driver_unregister(&bfin_serial_driver);
1303         uart_unregister_driver(&bfin_serial_reg);
1304 }
1305
1306 module_init(bfin_serial_init);
1307 module_exit(bfin_serial_exit);
1308
1309 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1310 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1311 MODULE_LICENSE("GPL");
1312 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);