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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         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 447         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 448         set_dma_x_modify(uart->tx_dma_channel, 1);
 449         enable_dma(uart->tx_dma_channel);
 450 #ifdef CONFIG_BF54x
 451         UART_SET_IER(uart, ETBEI);
 452 #else
 453         ier = UART_GET_IER(uart);
 454         ier |= ETBEI;
 455         UART_PUT_IER(uart, ier);
 456 #endif
 457         spin_unlock_irqrestore(&uart->port.lock, flags);
 458 }
 459
 460 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 461 {
 462         struct tty_struct *tty = uart->port.info->tty;
 463         int i, flg, status;
 464
 465         status = UART_GET_LSR(uart);
 466         uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
 467
 468         if (status & BI) {
 469                 uart->port.icount.brk++;
 470                 if (uart_handle_break(&uart->port))
 471                         goto dma_ignore_char;
 472                 status &= ~(PE | FE);
 473         }
 474         if (status & PE)
 475                 uart->port.icount.parity++;
 476         if (status & OE)
 477                 uart->port.icount.overrun++;
 478         if (status & FE)
 479                 uart->port.icount.frame++;
 480
 481         status &= uart->port.read_status_mask;
 482
 483         if (status & BI)
 484                 flg = TTY_BREAK;
 485         else if (status & PE)
 486                 flg = TTY_PARITY;
 487         else if (status & FE)
 488                 flg = TTY_FRAME;
 489         else
 490                 flg = TTY_NORMAL;
 491
 492         for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
 493                 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 494                         goto dma_ignore_char;
 495                 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
 496         }
 497
 498  dma_ignore_char:
 499         tty_flip_buffer_push(tty);
 500 }
 501
 502 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 503 {
 504         int x_pos, pos;
 505         int flags = 0;
 506
 507         bfin_serial_dma_tx_chars(uart);
 508
 509         spin_lock_irqsave(&uart->port.lock, flags);
 510         x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
 511         if (x_pos == DMA_RX_XCOUNT)
 512                 x_pos = 0;
 513
 514         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 515
 516         if (pos>uart->rx_dma_buf.tail) {
 517                 uart->rx_dma_buf.tail = pos;
 518                 bfin_serial_dma_rx_chars(uart);
 519                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 520         }
 521         spin_unlock_irqrestore(&uart->port.lock, flags);
 522         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 523         add_timer(&(uart->rx_dma_timer));
 524 }
 525
 526 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 527 {
 528         struct bfin_serial_port *uart = dev_id;
 529         struct circ_buf *xmit = &uart->port.info->xmit;
 530         unsigned short ier;
 531
 532         spin_lock(&uart->port.lock);
 533         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 534                 clear_dma_irqstat(uart->tx_dma_channel);
 535                 disable_dma(uart->tx_dma_channel);
 536 #ifdef CONFIG_BF54x
 537                 UART_CLEAR_IER(uart, ETBEI);
 538 #else
 539                 ier = UART_GET_IER(uart);
 540                 ier &= ~ETBEI;
 541                 UART_PUT_IER(uart, ier);
 542 #endif
 543                 xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1);
 544                 uart->port.icount.tx+=uart->tx_count;
 545
 546                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 547                         uart_write_wakeup(&uart->port);
 548
 549                 if (uart_circ_empty(xmit))
 550                         bfin_serial_stop_tx(&uart->port);
 551                 uart->tx_done = 1;
 552         }
 553
 554         spin_unlock(&uart->port.lock);
 555         return IRQ_HANDLED;
 556 }
 557
 558 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 559 {
 560         struct bfin_serial_port *uart = dev_id;
 561         unsigned short irqstat;
 562
 563         uart->rx_dma_nrows++;
 564         if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
 565                 uart->rx_dma_nrows = 0;
 566                 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
 567                 bfin_serial_dma_rx_chars(uart);
 568                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
 569         }
 570         spin_lock(&uart->port.lock);
 571         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 572         clear_dma_irqstat(uart->rx_dma_channel);
 573
 574         spin_unlock(&uart->port.lock);
 575         return IRQ_HANDLED;
 576 }
 577 #endif
 578
 579 /*
 580  * Return TIOCSER_TEMT when transmitter is not busy.
 581  */
 582 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 583 {
 584         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 585         unsigned short lsr;
 586
 587         lsr = UART_GET_LSR(uart);
 588         if (lsr & TEMT)
 589                 return TIOCSER_TEMT;
 590         else
 591                 return 0;
 592 }
 593
 594 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 595 {
 596 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 597         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 598         if (uart->cts_pin < 0)
 599                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 600
 601         if (gpio_get_value(uart->cts_pin))
 602                 return TIOCM_DSR | TIOCM_CAR;
 603         else
 604 #endif
 605                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 606 }
 607
 608 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 609 {
 610 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 611         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 612         if (uart->rts_pin < 0)
 613                 return;
 614
 615         if (mctrl & TIOCM_RTS)
 616                 gpio_set_value(uart->rts_pin, 0);
 617         else
 618                 gpio_set_value(uart->rts_pin, 1);
 619 #endif
 620 }
 621
 622 /*
 623  * Handle any change of modem status signal since we were last called.
 624  */
 625 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 626 {
 627 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 628         unsigned int status;
 629 # ifdef CONFIG_SERIAL_BFIN_DMA
 630         struct uart_info *info = uart->port.info;
 631         struct tty_struct *tty = info->tty;
 632
 633         status = bfin_serial_get_mctrl(&uart->port);
 634         if (!(status & TIOCM_CTS)) {
 635                 tty->hw_stopped = 1;
 636         } else {
 637                 tty->hw_stopped = 0;
 638         }
 639 # else
 640         status = bfin_serial_get_mctrl(&uart->port);
 641         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 642         if (!(status & TIOCM_CTS))
 643                 schedule_work(&uart->cts_workqueue);
 644 # endif
 645 #endif
 646 }
 647
 648 /*
 649  * Interrupts are always disabled.
 650  */
 651 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 652 {
 653         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 654         u16 lcr = UART_GET_LCR(uart);
 655         if (break_state)
 656                 lcr |= SB;
 657         else
 658                 lcr &= ~SB;
 659         UART_PUT_LCR(uart, lcr);
 660         SSYNC();
 661 }
 662
 663 static int bfin_serial_startup(struct uart_port *port)
 664 {
 665         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 666
 667 #ifdef CONFIG_SERIAL_BFIN_DMA
 668         dma_addr_t dma_handle;
 669
 670         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 671                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 672                 return -EBUSY;
 673         }
 674
 675         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 676                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 677                 free_dma(uart->rx_dma_channel);
 678                 return -EBUSY;
 679         }
 680
 681         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 682         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 683
 684         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 685         uart->rx_dma_buf.head = 0;
 686         uart->rx_dma_buf.tail = 0;
 687         uart->rx_dma_nrows = 0;
 688
 689         set_dma_config(uart->rx_dma_channel,
 690                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 691                                 INTR_ON_ROW, DIMENSION_2D,
 692                                 DATA_SIZE_8));
 693         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 694         set_dma_x_modify(uart->rx_dma_channel, 1);
 695         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 696         set_dma_y_modify(uart->rx_dma_channel, 1);
 697         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 698         enable_dma(uart->rx_dma_channel);
 699
 700         uart->rx_dma_timer.data = (unsigned long)(uart);
 701         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 702         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 703         add_timer(&(uart->rx_dma_timer));
 704 #else
 705         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 706              "BFIN_UART_RX", uart)) {
 707 # ifdef CONFIG_KGDB_UART
 708                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 709 # endif
 710                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 711                 return -EBUSY;
 712 # ifdef CONFIG_KGDB_UART
 713                 }
 714 # endif
 715         }
 716
 717
 718         if (request_irq
 719             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 720              "BFIN_UART_TX", uart)) {
 721                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 722                 free_irq(uart->port.irq, uart);
 723                 return -EBUSY;
 724         }
 725 #endif
 726 #ifdef CONFIG_BF54x
 727         UART_SET_IER(uart, ERBFI);
 728 #else
 729         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 730 #endif
 731         return 0;
 732 }
 733
 734 static void bfin_serial_shutdown(struct uart_port *port)
 735 {
 736         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 737
 738 #ifdef CONFIG_SERIAL_BFIN_DMA
 739         disable_dma(uart->tx_dma_channel);
 740         free_dma(uart->tx_dma_channel);
 741         disable_dma(uart->rx_dma_channel);
 742         free_dma(uart->rx_dma_channel);
 743         del_timer(&(uart->rx_dma_timer));
 744 #else
 745 #ifdef  CONFIG_KGDB_UART
 746         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 747 #endif
 748         free_irq(uart->port.irq, uart);
 749         free_irq(uart->port.irq+1, uart);
 750 #endif
 751 }
 752
 753 static void
 754 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 755                    struct ktermios *old)
 756 {
 757         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 758         unsigned long flags;
 759         unsigned int baud, quot;
 760         unsigned short val, ier, lsr, lcr = 0;
 761
 762         switch (termios->c_cflag & CSIZE) {
 763         case CS8:
 764                 lcr = WLS(8);
 765                 break;
 766         case CS7:
 767                 lcr = WLS(7);
 768                 break;
 769         case CS6:
 770                 lcr = WLS(6);
 771                 break;
 772         case CS5:
 773                 lcr = WLS(5);
 774                 break;
 775         default:
 776                 printk(KERN_ERR "%s: word lengh not supported\n",
 777                         __FUNCTION__);
 778         }
 779
 780         if (termios->c_cflag & CSTOPB)
 781                 lcr |= STB;
 782         if (termios->c_cflag & PARENB)
 783                 lcr |= PEN;
 784         if (!(termios->c_cflag & PARODD))
 785                 lcr |= EPS;
 786         if (termios->c_cflag & CMSPAR)
 787                 lcr |= STP;
 788
 789         port->read_status_mask = OE;
 790         if (termios->c_iflag & INPCK)
 791                 port->read_status_mask |= (FE | PE);
 792         if (termios->c_iflag & (BRKINT | PARMRK))
 793                 port->read_status_mask |= BI;
 794
 795         /*
 796          * Characters to ignore
 797          */
 798         port->ignore_status_mask = 0;
 799         if (termios->c_iflag & IGNPAR)
 800                 port->ignore_status_mask |= FE | PE;
 801         if (termios->c_iflag & IGNBRK) {
 802                 port->ignore_status_mask |= BI;
 803                 /*
 804                  * If we're ignoring parity and break indicators,
 805                  * ignore overruns too (for real raw support).
 806                  */
 807                 if (termios->c_iflag & IGNPAR)
 808                         port->ignore_status_mask |= OE;
 809         }
 810
 811         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 812         quot = uart_get_divisor(port, baud);
 813         spin_lock_irqsave(&uart->port.lock, flags);
 814
 815         do {
 816                 lsr = UART_GET_LSR(uart);
 817         } while (!(lsr & TEMT));
 818
 819         /* Disable UART */
 820         ier = UART_GET_IER(uart);
 821 #ifdef CONFIG_BF54x
 822         UART_CLEAR_IER(uart, 0xF);
 823 #else
 824         UART_PUT_IER(uart, 0);
 825 #endif
 826
 827 #ifndef CONFIG_BF54x
 828         /* Set DLAB in LCR to Access DLL and DLH */
 829         val = UART_GET_LCR(uart);
 830         val |= DLAB;
 831         UART_PUT_LCR(uart, val);
 832         SSYNC();
 833 #endif
 834
 835         UART_PUT_DLL(uart, quot & 0xFF);
 836         SSYNC();
 837         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 838         SSYNC();
 839
 840 #ifndef CONFIG_BF54x
 841         /* Clear DLAB in LCR to Access THR RBR IER */
 842         val = UART_GET_LCR(uart);
 843         val &= ~DLAB;
 844         UART_PUT_LCR(uart, val);
 845         SSYNC();
 846 #endif
 847
 848         UART_PUT_LCR(uart, lcr);
 849
 850         /* Enable UART */
 851 #ifdef CONFIG_BF54x
 852         UART_SET_IER(uart, ier);
 853 #else
 854         UART_PUT_IER(uart, ier);
 855 #endif
 856
 857         val = UART_GET_GCTL(uart);
 858         val |= UCEN;
 859         UART_PUT_GCTL(uart, val);
 860
 861         spin_unlock_irqrestore(&uart->port.lock, flags);
 862 }
 863
 864 static const char *bfin_serial_type(struct uart_port *port)
 865 {
 866         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 867
 868         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 869 }
 870
 871 /*
 872  * Release the memory region(s) being used by 'port'.
 873  */
 874 static void bfin_serial_release_port(struct uart_port *port)
 875 {
 876 }
 877
 878 /*
 879  * Request the memory region(s) being used by 'port'.
 880  */
 881 static int bfin_serial_request_port(struct uart_port *port)
 882 {
 883         return 0;
 884 }
 885
 886 /*
 887  * Configure/autoconfigure the port.
 888  */
 889 static void bfin_serial_config_port(struct uart_port *port, int flags)
 890 {
 891         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 892
 893         if (flags & UART_CONFIG_TYPE &&
 894             bfin_serial_request_port(&uart->port) == 0)
 895                 uart->port.type = PORT_BFIN;
 896 }
 897
 898 /*
 899  * Verify the new serial_struct (for TIOCSSERIAL).
 900  * The only change we allow are to the flags and type, and
 901  * even then only between PORT_BFIN and PORT_UNKNOWN
 902  */
 903 static int
 904 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 905 {
 906         return 0;
 907 }
 908
 909 static struct uart_ops bfin_serial_pops = {
 910         .tx_empty       = bfin_serial_tx_empty,
 911         .set_mctrl      = bfin_serial_set_mctrl,
 912         .get_mctrl      = bfin_serial_get_mctrl,
 913         .stop_tx        = bfin_serial_stop_tx,
 914         .start_tx       = bfin_serial_start_tx,
 915         .stop_rx        = bfin_serial_stop_rx,
 916         .enable_ms      = bfin_serial_enable_ms,
 917         .break_ctl      = bfin_serial_break_ctl,
 918         .startup        = bfin_serial_startup,
 919         .shutdown       = bfin_serial_shutdown,
 920         .set_termios    = bfin_serial_set_termios,
 921         .type           = bfin_serial_type,
 922         .release_port   = bfin_serial_release_port,
 923         .request_port   = bfin_serial_request_port,
 924         .config_port    = bfin_serial_config_port,
 925         .verify_port    = bfin_serial_verify_port,
 926 };
 927
 928 static void __init bfin_serial_init_ports(void)
 929 {
 930         static int first = 1;
 931         int i;
 932
 933         if (!first)
 934                 return;
 935         first = 0;
 936
 937         for (i = 0; i < nr_ports; i++) {
 938                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 939                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 940                 bfin_serial_ports[i].port.line      = i;
 941                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 942                 bfin_serial_ports[i].port.membase   =
 943                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 944                 bfin_serial_ports[i].port.mapbase   =
 945                         bfin_serial_resource[i].uart_base_addr;
 946                 bfin_serial_ports[i].port.irq       =
 947                         bfin_serial_resource[i].uart_irq;
 948                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 949 #ifdef CONFIG_SERIAL_BFIN_DMA
 950                 bfin_serial_ports[i].tx_done        = 1;
 951                 bfin_serial_ports[i].tx_count       = 0;
 952                 bfin_serial_ports[i].tx_dma_channel =
 953                         bfin_serial_resource[i].uart_tx_dma_channel;
 954                 bfin_serial_ports[i].rx_dma_channel =
 955                         bfin_serial_resource[i].uart_rx_dma_channel;
 956                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 957 #else
 958                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 959 #endif
 960 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 961                 bfin_serial_ports[i].cts_pin        =
 962                         bfin_serial_resource[i].uart_cts_pin;
 963                 bfin_serial_ports[i].rts_pin        =
 964                         bfin_serial_resource[i].uart_rts_pin;
 965 #endif
 966                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 967         }
 968
 969 }
 970
 971 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 972 /*
 973  * If the port was already initialised (eg, by a boot loader),
 974  * try to determine the current setup.
 975  */
 976 static void __init
 977 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 978                            int *parity, int *bits)
 979 {
 980         unsigned short status;
 981
 982         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 983         if (status == (ERBFI | ETBEI)) {
 984                 /* ok, the port was enabled */
 985                 unsigned short lcr, val;
 986                 unsigned short dlh, dll;
 987
 988                 lcr = UART_GET_LCR(uart);
 989
 990                 *parity = 'n';
 991                 if (lcr & PEN) {
 992                         if (lcr & EPS)
 993                                 *parity = 'e';
 994                         else
 995                                 *parity = 'o';
 996                 }
 997                 switch (lcr & 0x03) {
 998                         case 0: *bits = 5; break;
 999                         case 1: *bits = 6; break;
1000                         case 2: *bits = 7; break;
1001                         case 3: *bits = 8; break;
1002                 }
1003 #ifndef CONFIG_BF54x
1004                 /* Set DLAB in LCR to Access DLL and DLH */
1005                 val = UART_GET_LCR(uart);
1006                 val |= DLAB;
1007                 UART_PUT_LCR(uart, val);
1008 #endif
1009
1010                 dll = UART_GET_DLL(uart);
1011                 dlh = UART_GET_DLH(uart);
1012
1013 #ifndef CONFIG_BF54x
1014                 /* Clear DLAB in LCR to Access THR RBR IER */
1015                 val = UART_GET_LCR(uart);
1016                 val &= ~DLAB;
1017                 UART_PUT_LCR(uart, val);
1018 #endif
1019
1020                 *baud = get_sclk() / (16*(dll | dlh << 8));
1021         }
1022         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1023 }
1024 #endif
1025
1026 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1027 static struct uart_driver bfin_serial_reg;
1028
1029 static int __init
1030 bfin_serial_console_setup(struct console *co, char *options)
1031 {
1032         struct bfin_serial_port *uart;
1033 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1034         int baud = 57600;
1035         int bits = 8;
1036         int parity = 'n';
1037 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1038         int flow = 'r';
1039 #  else
1040         int flow = 'n';
1041 #  endif
1042 # endif
1043
1044         /*
1045          * Check whether an invalid uart number has been specified, and
1046          * if so, search for the first available port that does have
1047          * console support.
1048          */
1049         if (co->index == -1 || co->index >= nr_ports)
1050                 co->index = 0;
1051         uart = &bfin_serial_ports[co->index];
1052
1053 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1054         if (options)
1055                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1056         else
1057                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1058
1059         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1060 # else
1061         return 0;
1062 # endif
1063 }
1064 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1065                                  defined (CONFIG_EARLY_PRINTK) */
1066
1067 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1068 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1069 {
1070         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1071         while (!(UART_GET_LSR(uart) & THRE))
1072                 barrier();
1073         UART_PUT_CHAR(uart, ch);
1074         SSYNC();
1075 }
1076
1077 /*
1078  * Interrupts are disabled on entering
1079  */
1080 static void
1081 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1082 {
1083         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1084         int flags = 0;
1085
1086         spin_lock_irqsave(&uart->port.lock, flags);
1087         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1088         spin_unlock_irqrestore(&uart->port.lock, flags);
1089
1090 }
1091
1092 static struct console bfin_serial_console = {
1093         .name           = BFIN_SERIAL_NAME,
1094         .write          = bfin_serial_console_write,
1095         .device         = uart_console_device,
1096         .setup          = bfin_serial_console_setup,
1097         .flags          = CON_PRINTBUFFER,
1098         .index          = -1,
1099         .data           = &bfin_serial_reg,
1100 };
1101
1102 static int __init bfin_serial_rs_console_init(void)
1103 {
1104         bfin_serial_init_ports();
1105         register_console(&bfin_serial_console);
1106 #ifdef CONFIG_KGDB_UART
1107         kgdb_entry_state = 0;
1108         init_kgdb_uart();
1109 #endif
1110         return 0;
1111 }
1112 console_initcall(bfin_serial_rs_console_init);
1113
1114 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1115 #else
1116 #define BFIN_SERIAL_CONSOLE     NULL
1117 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1118
1119
1120 #ifdef CONFIG_EARLY_PRINTK
1121 static __init void early_serial_putc(struct uart_port *port, int ch)
1122 {
1123         unsigned timeout = 0xffff;
1124         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1125
1126         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1127                 cpu_relax();
1128         UART_PUT_CHAR(uart, ch);
1129 }
1130
1131 static __init void early_serial_write(struct console *con, const char *s,
1132                                         unsigned int n)
1133 {
1134         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1135         unsigned int i;
1136
1137         for (i = 0; i < n; i++, s++) {
1138                 if (*s == '\n')
1139                         early_serial_putc(&uart->port, '\r');
1140                 early_serial_putc(&uart->port, *s);
1141         }
1142 }
1143
1144 static struct __init console bfin_early_serial_console = {
1145         .name = "early_BFuart",
1146         .write = early_serial_write,
1147         .device = uart_console_device,
1148         .flags = CON_PRINTBUFFER,
1149         .setup = bfin_serial_console_setup,
1150         .index = -1,
1151         .data  = &bfin_serial_reg,
1152 };
1153
1154 struct console __init *bfin_earlyserial_init(unsigned int port,
1155                                                 unsigned int cflag)
1156 {
1157         struct bfin_serial_port *uart;
1158         struct ktermios t;
1159
1160         if (port == -1 || port >= nr_ports)
1161                 port = 0;
1162         bfin_serial_init_ports();
1163         bfin_early_serial_console.index = port;
1164         uart = &bfin_serial_ports[port];
1165         t.c_cflag = cflag;
1166         t.c_iflag = 0;
1167         t.c_oflag = 0;
1168         t.c_lflag = ICANON;
1169         t.c_line = port;
1170         bfin_serial_set_termios(&uart->port, &t, &t);
1171         return &bfin_early_serial_console;
1172 }
1173
1174 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1175
1176 static struct uart_driver bfin_serial_reg = {
1177         .owner                  = THIS_MODULE,
1178         .driver_name            = "bfin-uart",
1179         .dev_name               = BFIN_SERIAL_NAME,
1180         .major                  = BFIN_SERIAL_MAJOR,
1181         .minor                  = BFIN_SERIAL_MINOR,
1182         .nr                     = NR_PORTS,
1183         .cons                   = BFIN_SERIAL_CONSOLE,
1184 };
1185
1186 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1187 {
1188         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1189
1190         if (uart)
1191                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1192
1193         return 0;
1194 }
1195
1196 static int bfin_serial_resume(struct platform_device *dev)
1197 {
1198         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1199
1200         if (uart)
1201                 uart_resume_port(&bfin_serial_reg, &uart->port);
1202
1203         return 0;
1204 }
1205
1206 static int bfin_serial_probe(struct platform_device *dev)
1207 {
1208         struct resource *res = dev->resource;
1209         int i;
1210
1211         for (i = 0; i < dev->num_resources; i++, res++)
1212                 if (res->flags & IORESOURCE_MEM)
1213                         break;
1214
1215         if (i < dev->num_resources) {
1216                 for (i = 0; i < nr_ports; i++, res++) {
1217                         if (bfin_serial_ports[i].port.mapbase != res->start)
1218                                 continue;
1219                         bfin_serial_ports[i].port.dev = &dev->dev;
1220                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1221                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1222                 }
1223         }
1224
1225         return 0;
1226 }
1227
1228 static int bfin_serial_remove(struct platform_device *pdev)
1229 {
1230         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1231
1232
1233 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1234         gpio_free(uart->cts_pin);
1235         gpio_free(uart->rts_pin);
1236 #endif
1237
1238         platform_set_drvdata(pdev, NULL);
1239
1240         if (uart)
1241                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1242
1243         return 0;
1244 }
1245
1246 static struct platform_driver bfin_serial_driver = {
1247         .probe          = bfin_serial_probe,
1248         .remove         = bfin_serial_remove,
1249         .suspend        = bfin_serial_suspend,
1250         .resume         = bfin_serial_resume,
1251         .driver         = {
1252                 .name   = "bfin-uart",
1253         },
1254 };
1255
1256 static int __init bfin_serial_init(void)
1257 {
1258         int ret;
1259 #ifdef CONFIG_KGDB_UART
1260         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1261         struct ktermios t;
1262 #endif
1263
1264         pr_info("Serial: Blackfin serial driver\n");
1265
1266         bfin_serial_init_ports();
1267
1268         ret = uart_register_driver(&bfin_serial_reg);
1269         if (ret == 0) {
1270                 ret = platform_driver_register(&bfin_serial_driver);
1271                 if (ret) {
1272                         pr_debug("uart register failed\n");
1273                         uart_unregister_driver(&bfin_serial_reg);
1274                 }
1275         }
1276 #ifdef CONFIG_KGDB_UART
1277         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1278                 request_irq(uart->port.irq, bfin_serial_rx_int,
1279                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1280                 pr_info("Request irq for kgdb uart port\n");
1281 #ifdef CONFIG_BF54x
1282                 UART_SET_IER(uart, ERBFI);
1283 #else
1284                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1285 #endif
1286                 SSYNC();
1287                 t.c_cflag = CS8|B57600;
1288                 t.c_iflag = 0;
1289                 t.c_oflag = 0;
1290                 t.c_lflag = ICANON;
1291                 t.c_line = CONFIG_KGDB_UART_PORT;
1292                 bfin_serial_set_termios(&uart->port, &t, &t);
1293         }
1294 #endif
1295         return ret;
1296 }
1297
1298 static void __exit bfin_serial_exit(void)
1299 {
1300         platform_driver_unregister(&bfin_serial_driver);
1301         uart_unregister_driver(&bfin_serial_reg);
1302 }
1303
1304 module_init(bfin_serial_init);
1305 module_exit(bfin_serial_exit);
1306
1307 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1308 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1309 MODULE_LICENSE("GPL");
1310 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);