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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 #endif
  78
  79 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
  80
  81 /*
  82  * interrupts are disabled on entry
  83  */
  84 static void bfin_serial_stop_tx(struct uart_port *port)
  85 {
  86         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  87 #if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
  88         unsigned short ier;
  89 #endif
  90
  91         while (!(UART_GET_LSR(uart) & TEMT))
  92                 continue;
  93
  94 #ifdef CONFIG_SERIAL_BFIN_DMA
  95         disable_dma(uart->tx_dma_channel);
  96 #else
  97 #ifdef CONFIG_BF54x
  98         /* Waiting for Transmission Finished */
  99         while (!(UART_GET_LSR(uart) & TFI))
 100                 continue;
 101         /* Clear TFI bit */
 102         UART_PUT_LSR(uart, TFI);
 103         UART_CLEAR_IER(uart, ETBEI);
 104 #else
 105         ier = UART_GET_IER(uart);
 106         ier &= ~ETBEI;
 107         UART_PUT_IER(uart, ier);
 108 #endif
 109 #endif
 110 }
 111
 112 /*
 113  * port is locked and interrupts are disabled
 114  */
 115 static void bfin_serial_start_tx(struct uart_port *port)
 116 {
 117         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 118
 119 #ifdef CONFIG_SERIAL_BFIN_DMA
 120         bfin_serial_dma_tx_chars(uart);
 121 #else
 122 #ifdef CONFIG_BF54x
 123         UART_SET_IER(uart, ETBEI);
 124 #else
 125         unsigned short ier;
 126         ier = UART_GET_IER(uart);
 127         ier |= ETBEI;
 128         UART_PUT_IER(uart, ier);
 129 #endif
 130         bfin_serial_tx_chars(uart);
 131 #endif
 132 }
 133
 134 /*
 135  * Interrupts are enabled
 136  */
 137 static void bfin_serial_stop_rx(struct uart_port *port)
 138 {
 139         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 140 #ifdef  CONFIG_KGDB_UART
 141         if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 142 #endif
 143 #ifdef CONFIG_BF54x
 144         UART_CLEAR_IER(uart, ERBFI);
 145 #else
 146         unsigned short ier;
 147
 148         ier = UART_GET_IER(uart);
 149         ier &= ~ERBFI;
 150         UART_PUT_IER(uart, ier);
 151 #endif
 152 #ifdef  CONFIG_KGDB_UART
 153         }
 154 #endif
 155 }
 156
 157 /*
 158  * Set the modem control timer to fire immediately.
 159  */
 160 static void bfin_serial_enable_ms(struct uart_port *port)
 161 {
 162 }
 163
 164 #ifdef CONFIG_KGDB_UART
 165 static int kgdb_entry_state;
 166
 167 void kgdb_put_debug_char(int chr)
 168 {
 169         struct bfin_serial_port *uart;
 170
 171         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 172                 uart = &bfin_serial_ports[0];
 173         else
 174                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 175
 176         while (!(UART_GET_LSR(uart) & THRE)) {
 177                 SSYNC();
 178         }
 179
 180 #ifndef CONFIG_BF54x
 181         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 182         SSYNC();
 183 #endif
 184         UART_PUT_CHAR(uart, (unsigned char)chr);
 185         SSYNC();
 186 }
 187
 188 int kgdb_get_debug_char(void)
 189 {
 190         struct bfin_serial_port *uart;
 191         unsigned char chr;
 192
 193         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 194                 uart = &bfin_serial_ports[0];
 195         else
 196                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 197
 198         while(!(UART_GET_LSR(uart) & DR)) {
 199                 SSYNC();
 200         }
 201 #ifndef CONFIG_BF54x
 202         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 203         SSYNC();
 204 #endif
 205         chr = UART_GET_CHAR(uart);
 206         SSYNC();
 207
 208         return chr;
 209 }
 210 #endif
 211
 212 #ifdef CONFIG_SERIAL_BFIN_PIO
 213 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 214 {
 215         struct tty_struct *tty = uart->port.info->tty;
 216         unsigned int status, ch, flg;
 217         static int in_break = 0;
 218 #ifdef CONFIG_KGDB_UART
 219         struct pt_regs *regs = get_irq_regs();
 220 #endif
 221
 222         ch = UART_GET_CHAR(uart);
 223         status = UART_GET_LSR(uart);
 224         uart->port.icount.rx++;
 225
 226 #ifdef CONFIG_KGDB_UART
 227         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
 228                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
 229                         kgdb_breakkey_pressed(regs);
 230                         return;
 231                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
 232                         kgdb_entry_state = 1;
 233                 } else if (kgdb_entry_state == 1 && ch == 'q') {
 234                         kgdb_entry_state = 0;
 235                         kgdb_breakkey_pressed(regs);
 236                         return;
 237                 } else if (ch == 0x3) {/* Ctrl + C */
 238                         kgdb_entry_state = 0;
 239                         kgdb_breakkey_pressed(regs);
 240                         return;
 241                 } else {
 242                         kgdb_entry_state = 0;
 243                 }
 244         }
 245 #endif
 246
 247         if (ANOMALY_05000230) {
 248                 /* The BF533 family of processors have a nice misbehavior where
 249                  * they continuously generate characters for a "single" break.
 250                  * We have to basically ignore this flood until the "next" valid
 251                  * character comes across.  All other Blackfin families operate
 252                  * properly though.
 253                  * Note: While Anomaly 05000230 does not directly address this,
 254                  *       the changes that went in for it also fixed this issue.
 255                  */
 256                 if (in_break) {
 257                         if (ch != 0) {
 258                                 in_break = 0;
 259                                 ch = UART_GET_CHAR(uart);
 260                                 if (bfin_revid() < 5)
 261                                         return;
 262                         } else
 263                                 return;
 264                 }
 265         }
 266
 267         if (status & BI) {
 268                 if (ANOMALY_05000230)
 269                         in_break = 1;
 270                 uart->port.icount.brk++;
 271                 if (uart_handle_break(&uart->port))
 272                         goto ignore_char;
 273                 status &= ~(PE | FE);
 274         }
 275         if (status & PE)
 276                 uart->port.icount.parity++;
 277         if (status & OE)
 278                 uart->port.icount.overrun++;
 279         if (status & FE)
 280                 uart->port.icount.frame++;
 281
 282         status &= uart->port.read_status_mask;
 283
 284         if (status & BI)
 285                 flg = TTY_BREAK;
 286         else if (status & PE)
 287                 flg = TTY_PARITY;
 288         else if (status & FE)
 289                 flg = TTY_FRAME;
 290         else
 291                 flg = TTY_NORMAL;
 292
 293         if (uart_handle_sysrq_char(&uart->port, ch))
 294                 goto ignore_char;
 295
 296         uart_insert_char(&uart->port, status, OE, ch, flg);
 297
 298  ignore_char:
 299         tty_flip_buffer_push(tty);
 300 }
 301
 302 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 303 {
 304         struct circ_buf *xmit = &uart->port.info->xmit;
 305
 306         if (uart->port.x_char) {
 307                 UART_PUT_CHAR(uart, uart->port.x_char);
 308                 uart->port.icount.tx++;
 309                 uart->port.x_char = 0;
 310         }
 311         /*
 312          * Check the modem control lines before
 313          * transmitting anything.
 314          */
 315         bfin_serial_mctrl_check(uart);
 316
 317         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 318                 bfin_serial_stop_tx(&uart->port);
 319                 return;
 320         }
 321
 322         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 323                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 324                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 325                 uart->port.icount.tx++;
 326                 SSYNC();
 327         }
 328
 329         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 330                 uart_write_wakeup(&uart->port);
 331
 332         if (uart_circ_empty(xmit))
 333                 bfin_serial_stop_tx(&uart->port);
 334 }
 335
 336 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 337 {
 338         struct bfin_serial_port *uart = dev_id;
 339
 340         spin_lock(&uart->port.lock);
 341         while ((UART_GET_IER(uart) & ERBFI) && (UART_GET_LSR(uart) & DR))
 342                 bfin_serial_rx_chars(uart);
 343         spin_unlock(&uart->port.lock);
 344
 345         return IRQ_HANDLED;
 346 }
 347
 348 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 349 {
 350         struct bfin_serial_port *uart = dev_id;
 351
 352         spin_lock(&uart->port.lock);
 353         if ((UART_GET_IER(uart) & ETBEI) && (UART_GET_LSR(uart) & THRE))
 354                 bfin_serial_tx_chars(uart);
 355         spin_unlock(&uart->port.lock);
 356
 357         return IRQ_HANDLED;
 358 }
 359
 360
 361 static void bfin_serial_do_work(struct work_struct *work)
 362 {
 363         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 364
 365         bfin_serial_mctrl_check(uart);
 366 }
 367 #endif
 368
 369 #ifdef CONFIG_SERIAL_BFIN_DMA
 370 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 371 {
 372         struct circ_buf *xmit = &uart->port.info->xmit;
 373         unsigned short ier;
 374         int flags = 0;
 375
 376         if (!uart->tx_done)
 377                 return;
 378         uart->tx_done = 0;
 379
 380         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 381                 bfin_serial_stop_tx(&uart->port);
 382                 uart->tx_done = 1;
 383                 return;
 384         }
 385
 386         if (uart->port.x_char) {
 387                 UART_PUT_CHAR(uart, uart->port.x_char);
 388                 uart->port.icount.tx++;
 389                 uart->port.x_char = 0;
 390         }
 391
 392         /*
 393          * Check the modem control lines before
 394          * transmitting anything.
 395          */
 396         bfin_serial_mctrl_check(uart);
 397
 398         spin_lock_irqsave(&uart->port.lock, flags);
 399         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 400         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 401                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 402         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 403                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 404         set_dma_config(uart->tx_dma_channel,
 405                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 406                         INTR_ON_BUF,
 407                         DIMENSION_LINEAR,
 408                         DATA_SIZE_8,
 409                         DMA_SYNC_RESTART));
 410         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 411         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 412         set_dma_x_modify(uart->tx_dma_channel, 1);
 413         enable_dma(uart->tx_dma_channel);
 414 #ifdef CONFIG_BF54x
 415         UART_SET_IER(uart, ETBEI);
 416 #else
 417         ier = UART_GET_IER(uart);
 418         ier |= ETBEI;
 419         UART_PUT_IER(uart, ier);
 420 #endif
 421         spin_unlock_irqrestore(&uart->port.lock, flags);
 422 }
 423
 424 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 425 {
 426         struct tty_struct *tty = uart->port.info->tty;
 427         int i, flg, status;
 428
 429         status = UART_GET_LSR(uart);
 430         uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
 431
 432         if (status & BI) {
 433                 uart->port.icount.brk++;
 434                 if (uart_handle_break(&uart->port))
 435                         goto dma_ignore_char;
 436                 status &= ~(PE | FE);
 437         }
 438         if (status & PE)
 439                 uart->port.icount.parity++;
 440         if (status & OE)
 441                 uart->port.icount.overrun++;
 442         if (status & FE)
 443                 uart->port.icount.frame++;
 444
 445         status &= uart->port.read_status_mask;
 446
 447         if (status & BI)
 448                 flg = TTY_BREAK;
 449         else if (status & PE)
 450                 flg = TTY_PARITY;
 451         else if (status & FE)
 452                 flg = TTY_FRAME;
 453         else
 454                 flg = TTY_NORMAL;
 455
 456         for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
 457                 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 458                         goto dma_ignore_char;
 459                 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
 460         }
 461
 462  dma_ignore_char:
 463         tty_flip_buffer_push(tty);
 464 }
 465
 466 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 467 {
 468         int x_pos, pos;
 469         int flags = 0;
 470
 471         spin_lock_irqsave(&uart->port.lock, flags);
 472         x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
 473         if (x_pos == DMA_RX_XCOUNT)
 474                 x_pos = 0;
 475
 476         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 477
 478         if (pos>uart->rx_dma_buf.tail) {
 479                 uart->rx_dma_buf.tail = pos;
 480                 bfin_serial_dma_rx_chars(uart);
 481                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 482         }
 483         spin_unlock_irqrestore(&uart->port.lock, flags);
 484         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 485         add_timer(&(uart->rx_dma_timer));
 486 }
 487
 488 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 489 {
 490         struct bfin_serial_port *uart = dev_id;
 491         struct circ_buf *xmit = &uart->port.info->xmit;
 492         unsigned short ier;
 493
 494         spin_lock(&uart->port.lock);
 495         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 496                 clear_dma_irqstat(uart->tx_dma_channel);
 497                 disable_dma(uart->tx_dma_channel);
 498 #ifdef CONFIG_BF54x
 499                 UART_CLEAR_IER(uart, ETBEI);
 500 #else
 501                 ier = UART_GET_IER(uart);
 502                 ier &= ~ETBEI;
 503                 UART_PUT_IER(uart, ier);
 504 #endif
 505                 xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1);
 506                 uart->port.icount.tx+=uart->tx_count;
 507
 508                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 509                         uart_write_wakeup(&uart->port);
 510
 511                 uart->tx_done = 1;
 512
 513                 bfin_serial_dma_tx_chars(uart);
 514         }
 515
 516         spin_unlock(&uart->port.lock);
 517         return IRQ_HANDLED;
 518 }
 519
 520 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 521 {
 522         struct bfin_serial_port *uart = dev_id;
 523         unsigned short irqstat;
 524
 525         uart->rx_dma_nrows++;
 526         if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
 527                 uart->rx_dma_nrows = 0;
 528                 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
 529                 bfin_serial_dma_rx_chars(uart);
 530                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
 531         }
 532         spin_lock(&uart->port.lock);
 533         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 534         clear_dma_irqstat(uart->rx_dma_channel);
 535
 536         spin_unlock(&uart->port.lock);
 537         return IRQ_HANDLED;
 538 }
 539 #endif
 540
 541 /*
 542  * Return TIOCSER_TEMT when transmitter is not busy.
 543  */
 544 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 545 {
 546         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 547         unsigned short lsr;
 548
 549         lsr = UART_GET_LSR(uart);
 550         if (lsr & TEMT)
 551                 return TIOCSER_TEMT;
 552         else
 553                 return 0;
 554 }
 555
 556 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 557 {
 558 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 559         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 560         if (uart->cts_pin < 0)
 561                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 562
 563         if (gpio_get_value(uart->cts_pin))
 564                 return TIOCM_DSR | TIOCM_CAR;
 565         else
 566 #endif
 567                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 568 }
 569
 570 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 571 {
 572 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 573         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 574         if (uart->rts_pin < 0)
 575                 return;
 576
 577         if (mctrl & TIOCM_RTS)
 578                 gpio_set_value(uart->rts_pin, 0);
 579         else
 580                 gpio_set_value(uart->rts_pin, 1);
 581 #endif
 582 }
 583
 584 /*
 585  * Handle any change of modem status signal since we were last called.
 586  */
 587 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 588 {
 589 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 590         unsigned int status;
 591 # ifdef CONFIG_SERIAL_BFIN_DMA
 592         struct uart_info *info = uart->port.info;
 593         struct tty_struct *tty = info->tty;
 594
 595         status = bfin_serial_get_mctrl(&uart->port);
 596         if (!(status & TIOCM_CTS)) {
 597                 tty->hw_stopped = 1;
 598         } else {
 599                 tty->hw_stopped = 0;
 600         }
 601 # else
 602         status = bfin_serial_get_mctrl(&uart->port);
 603         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 604         if (!(status & TIOCM_CTS))
 605                 schedule_work(&uart->cts_workqueue);
 606 # endif
 607 #endif
 608 }
 609
 610 /*
 611  * Interrupts are always disabled.
 612  */
 613 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 614 {
 615         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 616         u16 lcr = UART_GET_LCR(uart);
 617         if (break_state)
 618                 lcr |= SB;
 619         else
 620                 lcr &= ~SB;
 621         UART_PUT_LCR(uart, lcr);
 622         SSYNC();
 623 }
 624
 625 static int bfin_serial_startup(struct uart_port *port)
 626 {
 627         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 628
 629 #ifdef CONFIG_SERIAL_BFIN_DMA
 630         dma_addr_t dma_handle;
 631
 632         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 633                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 634                 return -EBUSY;
 635         }
 636
 637         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 638                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 639                 free_dma(uart->rx_dma_channel);
 640                 return -EBUSY;
 641         }
 642
 643         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 644         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 645
 646         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 647         uart->rx_dma_buf.head = 0;
 648         uart->rx_dma_buf.tail = 0;
 649         uart->rx_dma_nrows = 0;
 650
 651         set_dma_config(uart->rx_dma_channel,
 652                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 653                                 INTR_ON_ROW, DIMENSION_2D,
 654                                 DATA_SIZE_8,
 655                                 DMA_SYNC_RESTART));
 656         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 657         set_dma_x_modify(uart->rx_dma_channel, 1);
 658         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 659         set_dma_y_modify(uart->rx_dma_channel, 1);
 660         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 661         enable_dma(uart->rx_dma_channel);
 662
 663         uart->rx_dma_timer.data = (unsigned long)(uart);
 664         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 665         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 666         add_timer(&(uart->rx_dma_timer));
 667 #else
 668         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 669              "BFIN_UART_RX", uart)) {
 670 # ifdef CONFIG_KGDB_UART
 671                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 672 # endif
 673                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 674                 return -EBUSY;
 675 # ifdef CONFIG_KGDB_UART
 676                 }
 677 # endif
 678         }
 679
 680
 681         if (request_irq
 682             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 683              "BFIN_UART_TX", uart)) {
 684                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 685                 free_irq(uart->port.irq, uart);
 686                 return -EBUSY;
 687         }
 688 #endif
 689 #ifdef CONFIG_BF54x
 690         UART_SET_IER(uart, ERBFI);
 691 #else
 692         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 693 #endif
 694         return 0;
 695 }
 696
 697 static void bfin_serial_shutdown(struct uart_port *port)
 698 {
 699         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 700
 701 #ifdef CONFIG_SERIAL_BFIN_DMA
 702         disable_dma(uart->tx_dma_channel);
 703         free_dma(uart->tx_dma_channel);
 704         disable_dma(uart->rx_dma_channel);
 705         free_dma(uart->rx_dma_channel);
 706         del_timer(&(uart->rx_dma_timer));
 707 #else
 708 #ifdef  CONFIG_KGDB_UART
 709         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 710 #endif
 711         free_irq(uart->port.irq, uart);
 712         free_irq(uart->port.irq+1, uart);
 713 #endif
 714 }
 715
 716 static void
 717 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 718                    struct ktermios *old)
 719 {
 720         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 721         unsigned long flags;
 722         unsigned int baud, quot;
 723         unsigned short val, ier, lsr, lcr = 0;
 724
 725         switch (termios->c_cflag & CSIZE) {
 726         case CS8:
 727                 lcr = WLS(8);
 728                 break;
 729         case CS7:
 730                 lcr = WLS(7);
 731                 break;
 732         case CS6:
 733                 lcr = WLS(6);
 734                 break;
 735         case CS5:
 736                 lcr = WLS(5);
 737                 break;
 738         default:
 739                 printk(KERN_ERR "%s: word lengh not supported\n",
 740                         __FUNCTION__);
 741         }
 742
 743         if (termios->c_cflag & CSTOPB)
 744                 lcr |= STB;
 745         if (termios->c_cflag & PARENB)
 746                 lcr |= PEN;
 747         if (!(termios->c_cflag & PARODD))
 748                 lcr |= EPS;
 749         if (termios->c_cflag & CMSPAR)
 750                 lcr |= STP;
 751
 752         port->read_status_mask = OE;
 753         if (termios->c_iflag & INPCK)
 754                 port->read_status_mask |= (FE | PE);
 755         if (termios->c_iflag & (BRKINT | PARMRK))
 756                 port->read_status_mask |= BI;
 757
 758         /*
 759          * Characters to ignore
 760          */
 761         port->ignore_status_mask = 0;
 762         if (termios->c_iflag & IGNPAR)
 763                 port->ignore_status_mask |= FE | PE;
 764         if (termios->c_iflag & IGNBRK) {
 765                 port->ignore_status_mask |= BI;
 766                 /*
 767                  * If we're ignoring parity and break indicators,
 768                  * ignore overruns too (for real raw support).
 769                  */
 770                 if (termios->c_iflag & IGNPAR)
 771                         port->ignore_status_mask |= OE;
 772         }
 773
 774         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 775         quot = uart_get_divisor(port, baud);
 776         spin_lock_irqsave(&uart->port.lock, flags);
 777
 778         do {
 779                 lsr = UART_GET_LSR(uart);
 780         } while (!(lsr & TEMT));
 781
 782         /* Disable UART */
 783         ier = UART_GET_IER(uart);
 784 #ifdef CONFIG_BF54x
 785         UART_CLEAR_IER(uart, 0xF);
 786 #else
 787         UART_PUT_IER(uart, 0);
 788 #endif
 789
 790 #ifndef CONFIG_BF54x
 791         /* Set DLAB in LCR to Access DLL and DLH */
 792         val = UART_GET_LCR(uart);
 793         val |= DLAB;
 794         UART_PUT_LCR(uart, val);
 795         SSYNC();
 796 #endif
 797
 798         UART_PUT_DLL(uart, quot & 0xFF);
 799         SSYNC();
 800         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 801         SSYNC();
 802
 803 #ifndef CONFIG_BF54x
 804         /* Clear DLAB in LCR to Access THR RBR IER */
 805         val = UART_GET_LCR(uart);
 806         val &= ~DLAB;
 807         UART_PUT_LCR(uart, val);
 808         SSYNC();
 809 #endif
 810
 811         UART_PUT_LCR(uart, lcr);
 812
 813         /* Enable UART */
 814 #ifdef CONFIG_BF54x
 815         UART_SET_IER(uart, ier);
 816 #else
 817         UART_PUT_IER(uart, ier);
 818 #endif
 819
 820         val = UART_GET_GCTL(uart);
 821         val |= UCEN;
 822         UART_PUT_GCTL(uart, val);
 823
 824         spin_unlock_irqrestore(&uart->port.lock, flags);
 825 }
 826
 827 static const char *bfin_serial_type(struct uart_port *port)
 828 {
 829         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 830
 831         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 832 }
 833
 834 /*
 835  * Release the memory region(s) being used by 'port'.
 836  */
 837 static void bfin_serial_release_port(struct uart_port *port)
 838 {
 839 }
 840
 841 /*
 842  * Request the memory region(s) being used by 'port'.
 843  */
 844 static int bfin_serial_request_port(struct uart_port *port)
 845 {
 846         return 0;
 847 }
 848
 849 /*
 850  * Configure/autoconfigure the port.
 851  */
 852 static void bfin_serial_config_port(struct uart_port *port, int flags)
 853 {
 854         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 855
 856         if (flags & UART_CONFIG_TYPE &&
 857             bfin_serial_request_port(&uart->port) == 0)
 858                 uart->port.type = PORT_BFIN;
 859 }
 860
 861 /*
 862  * Verify the new serial_struct (for TIOCSSERIAL).
 863  * The only change we allow are to the flags and type, and
 864  * even then only between PORT_BFIN and PORT_UNKNOWN
 865  */
 866 static int
 867 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 868 {
 869         return 0;
 870 }
 871
 872 static struct uart_ops bfin_serial_pops = {
 873         .tx_empty       = bfin_serial_tx_empty,
 874         .set_mctrl      = bfin_serial_set_mctrl,
 875         .get_mctrl      = bfin_serial_get_mctrl,
 876         .stop_tx        = bfin_serial_stop_tx,
 877         .start_tx       = bfin_serial_start_tx,
 878         .stop_rx        = bfin_serial_stop_rx,
 879         .enable_ms      = bfin_serial_enable_ms,
 880         .break_ctl      = bfin_serial_break_ctl,
 881         .startup        = bfin_serial_startup,
 882         .shutdown       = bfin_serial_shutdown,
 883         .set_termios    = bfin_serial_set_termios,
 884         .type           = bfin_serial_type,
 885         .release_port   = bfin_serial_release_port,
 886         .request_port   = bfin_serial_request_port,
 887         .config_port    = bfin_serial_config_port,
 888         .verify_port    = bfin_serial_verify_port,
 889 };
 890
 891 static void __init bfin_serial_init_ports(void)
 892 {
 893         static int first = 1;
 894         int i;
 895
 896         if (!first)
 897                 return;
 898         first = 0;
 899
 900         for (i = 0; i < nr_ports; i++) {
 901                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 902                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 903                 bfin_serial_ports[i].port.line      = i;
 904                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 905                 bfin_serial_ports[i].port.membase   =
 906                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 907                 bfin_serial_ports[i].port.mapbase   =
 908                         bfin_serial_resource[i].uart_base_addr;
 909                 bfin_serial_ports[i].port.irq       =
 910                         bfin_serial_resource[i].uart_irq;
 911                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 912 #ifdef CONFIG_SERIAL_BFIN_DMA
 913                 bfin_serial_ports[i].tx_done        = 1;
 914                 bfin_serial_ports[i].tx_count       = 0;
 915                 bfin_serial_ports[i].tx_dma_channel =
 916                         bfin_serial_resource[i].uart_tx_dma_channel;
 917                 bfin_serial_ports[i].rx_dma_channel =
 918                         bfin_serial_resource[i].uart_rx_dma_channel;
 919                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 920 #else
 921                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 922 #endif
 923 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 924                 bfin_serial_ports[i].cts_pin        =
 925                         bfin_serial_resource[i].uart_cts_pin;
 926                 bfin_serial_ports[i].rts_pin        =
 927                         bfin_serial_resource[i].uart_rts_pin;
 928 #endif
 929                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 930         }
 931
 932 }
 933
 934 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 935 /*
 936  * If the port was already initialised (eg, by a boot loader),
 937  * try to determine the current setup.
 938  */
 939 static void __init
 940 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 941                            int *parity, int *bits)
 942 {
 943         unsigned short status;
 944
 945         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 946         if (status == (ERBFI | ETBEI)) {
 947                 /* ok, the port was enabled */
 948                 unsigned short lcr, val;
 949                 unsigned short dlh, dll;
 950
 951                 lcr = UART_GET_LCR(uart);
 952
 953                 *parity = 'n';
 954                 if (lcr & PEN) {
 955                         if (lcr & EPS)
 956                                 *parity = 'e';
 957                         else
 958                                 *parity = 'o';
 959                 }
 960                 switch (lcr & 0x03) {
 961                         case 0: *bits = 5; break;
 962                         case 1: *bits = 6; break;
 963                         case 2: *bits = 7; break;
 964                         case 3: *bits = 8; break;
 965                 }
 966 #ifndef CONFIG_BF54x
 967                 /* Set DLAB in LCR to Access DLL and DLH */
 968                 val = UART_GET_LCR(uart);
 969                 val |= DLAB;
 970                 UART_PUT_LCR(uart, val);
 971 #endif
 972
 973                 dll = UART_GET_DLL(uart);
 974                 dlh = UART_GET_DLH(uart);
 975
 976 #ifndef CONFIG_BF54x
 977                 /* Clear DLAB in LCR to Access THR RBR IER */
 978                 val = UART_GET_LCR(uart);
 979                 val &= ~DLAB;
 980                 UART_PUT_LCR(uart, val);
 981 #endif
 982
 983                 *baud = get_sclk() / (16*(dll | dlh << 8));
 984         }
 985         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
 986 }
 987 #endif
 988
 989 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
 990 static struct uart_driver bfin_serial_reg;
 991
 992 static int __init
 993 bfin_serial_console_setup(struct console *co, char *options)
 994 {
 995         struct bfin_serial_port *uart;
 996 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
 997         int baud = 57600;
 998         int bits = 8;
 999         int parity = 'n';
1000 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1001         int flow = 'r';
1002 #  else
1003         int flow = 'n';
1004 #  endif
1005 # endif
1006
1007         /*
1008          * Check whether an invalid uart number has been specified, and
1009          * if so, search for the first available port that does have
1010          * console support.
1011          */
1012         if (co->index == -1 || co->index >= nr_ports)
1013                 co->index = 0;
1014         uart = &bfin_serial_ports[co->index];
1015
1016 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1017         if (options)
1018                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1019         else
1020                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1021
1022         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1023 # else
1024         return 0;
1025 # endif
1026 }
1027 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1028                                  defined (CONFIG_EARLY_PRINTK) */
1029
1030 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1031 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1032 {
1033         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1034         while (!(UART_GET_LSR(uart) & THRE))
1035                 barrier();
1036         UART_PUT_CHAR(uart, ch);
1037         SSYNC();
1038 }
1039
1040 /*
1041  * Interrupts are disabled on entering
1042  */
1043 static void
1044 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1045 {
1046         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1047         int flags = 0;
1048
1049         spin_lock_irqsave(&uart->port.lock, flags);
1050         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1051         spin_unlock_irqrestore(&uart->port.lock, flags);
1052
1053 }
1054
1055 static struct console bfin_serial_console = {
1056         .name           = BFIN_SERIAL_NAME,
1057         .write          = bfin_serial_console_write,
1058         .device         = uart_console_device,
1059         .setup          = bfin_serial_console_setup,
1060         .flags          = CON_PRINTBUFFER,
1061         .index          = -1,
1062         .data           = &bfin_serial_reg,
1063 };
1064
1065 static int __init bfin_serial_rs_console_init(void)
1066 {
1067         bfin_serial_init_ports();
1068         register_console(&bfin_serial_console);
1069 #ifdef CONFIG_KGDB_UART
1070         kgdb_entry_state = 0;
1071         init_kgdb_uart();
1072 #endif
1073         return 0;
1074 }
1075 console_initcall(bfin_serial_rs_console_init);
1076
1077 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1078 #else
1079 #define BFIN_SERIAL_CONSOLE     NULL
1080 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1081
1082
1083 #ifdef CONFIG_EARLY_PRINTK
1084 static __init void early_serial_putc(struct uart_port *port, int ch)
1085 {
1086         unsigned timeout = 0xffff;
1087         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1088
1089         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1090                 cpu_relax();
1091         UART_PUT_CHAR(uart, ch);
1092 }
1093
1094 static __init void early_serial_write(struct console *con, const char *s,
1095                                         unsigned int n)
1096 {
1097         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1098         unsigned int i;
1099
1100         for (i = 0; i < n; i++, s++) {
1101                 if (*s == '\n')
1102                         early_serial_putc(&uart->port, '\r');
1103                 early_serial_putc(&uart->port, *s);
1104         }
1105 }
1106
1107 static struct __init console bfin_early_serial_console = {
1108         .name = "early_BFuart",
1109         .write = early_serial_write,
1110         .device = uart_console_device,
1111         .flags = CON_PRINTBUFFER,
1112         .setup = bfin_serial_console_setup,
1113         .index = -1,
1114         .data  = &bfin_serial_reg,
1115 };
1116
1117 struct console __init *bfin_earlyserial_init(unsigned int port,
1118                                                 unsigned int cflag)
1119 {
1120         struct bfin_serial_port *uart;
1121         struct ktermios t;
1122
1123         if (port == -1 || port >= nr_ports)
1124                 port = 0;
1125         bfin_serial_init_ports();
1126         bfin_early_serial_console.index = port;
1127         uart = &bfin_serial_ports[port];
1128         t.c_cflag = cflag;
1129         t.c_iflag = 0;
1130         t.c_oflag = 0;
1131         t.c_lflag = ICANON;
1132         t.c_line = port;
1133         bfin_serial_set_termios(&uart->port, &t, &t);
1134         return &bfin_early_serial_console;
1135 }
1136
1137 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1138
1139 static struct uart_driver bfin_serial_reg = {
1140         .owner                  = THIS_MODULE,
1141         .driver_name            = "bfin-uart",
1142         .dev_name               = BFIN_SERIAL_NAME,
1143         .major                  = BFIN_SERIAL_MAJOR,
1144         .minor                  = BFIN_SERIAL_MINOR,
1145         .nr                     = NR_PORTS,
1146         .cons                   = BFIN_SERIAL_CONSOLE,
1147 };
1148
1149 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1150 {
1151         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1152
1153         if (uart)
1154                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1155
1156         return 0;
1157 }
1158
1159 static int bfin_serial_resume(struct platform_device *dev)
1160 {
1161         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1162
1163         if (uart)
1164                 uart_resume_port(&bfin_serial_reg, &uart->port);
1165
1166         return 0;
1167 }
1168
1169 static int bfin_serial_probe(struct platform_device *dev)
1170 {
1171         struct resource *res = dev->resource;
1172         int i;
1173
1174         for (i = 0; i < dev->num_resources; i++, res++)
1175                 if (res->flags & IORESOURCE_MEM)
1176                         break;
1177
1178         if (i < dev->num_resources) {
1179                 for (i = 0; i < nr_ports; i++, res++) {
1180                         if (bfin_serial_ports[i].port.mapbase != res->start)
1181                                 continue;
1182                         bfin_serial_ports[i].port.dev = &dev->dev;
1183                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1184                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1185                 }
1186         }
1187
1188         return 0;
1189 }
1190
1191 static int bfin_serial_remove(struct platform_device *pdev)
1192 {
1193         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1194
1195
1196 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1197         gpio_free(uart->cts_pin);
1198         gpio_free(uart->rts_pin);
1199 #endif
1200
1201         platform_set_drvdata(pdev, NULL);
1202
1203         if (uart)
1204                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1205
1206         return 0;
1207 }
1208
1209 static struct platform_driver bfin_serial_driver = {
1210         .probe          = bfin_serial_probe,
1211         .remove         = bfin_serial_remove,
1212         .suspend        = bfin_serial_suspend,
1213         .resume         = bfin_serial_resume,
1214         .driver         = {
1215                 .name   = "bfin-uart",
1216         },
1217 };
1218
1219 static int __init bfin_serial_init(void)
1220 {
1221         int ret;
1222 #ifdef CONFIG_KGDB_UART
1223         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1224         struct ktermios t;
1225 #endif
1226
1227         pr_info("Serial: Blackfin serial driver\n");
1228
1229         bfin_serial_init_ports();
1230
1231         ret = uart_register_driver(&bfin_serial_reg);
1232         if (ret == 0) {
1233                 ret = platform_driver_register(&bfin_serial_driver);
1234                 if (ret) {
1235                         pr_debug("uart register failed\n");
1236                         uart_unregister_driver(&bfin_serial_reg);
1237                 }
1238         }
1239 #ifdef CONFIG_KGDB_UART
1240         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1241                 request_irq(uart->port.irq, bfin_serial_rx_int,
1242                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1243                 pr_info("Request irq for kgdb uart port\n");
1244 #ifdef CONFIG_BF54x
1245                 UART_SET_IER(uart, ERBFI);
1246 #else
1247                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1248 #endif
1249                 SSYNC();
1250                 t.c_cflag = CS8|B57600;
1251                 t.c_iflag = 0;
1252                 t.c_oflag = 0;
1253                 t.c_lflag = ICANON;
1254                 t.c_line = CONFIG_KGDB_UART_PORT;
1255                 bfin_serial_set_termios(&uart->port, &t, &t);
1256         }
1257 #endif
1258         return ret;
1259 }
1260
1261 static void __exit bfin_serial_exit(void)
1262 {
1263         platform_driver_unregister(&bfin_serial_driver);
1264         uart_unregister_driver(&bfin_serial_reg);
1265 }
1266
1267 module_init(bfin_serial_init);
1268 module_exit(bfin_serial_exit);
1269
1270 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1271 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1272 MODULE_LICENSE("GPL");
1273 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);