git.oblomov.eu Git - linux-2.6/blob - drivers/serial/bfin_5xx.c

   1 /*
   2  * Blackfin On-Chip Serial Driver
   3  *
   4  * Copyright 2006-2007 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  12 #define SUPPORT_SYSRQ
  13 #endif
  14
  15 #include <linux/module.h>
  16 #include <linux/ioport.h>
  17 #include <linux/init.h>
  18 #include <linux/console.h>
  19 #include <linux/sysrq.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/tty.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/serial_core.h>
  24
  25 #ifdef CONFIG_KGDB_UART
  26 #include <linux/kgdb.h>
  27 #include <asm/irq_regs.h>
  28 #endif
  29
  30 #include <asm/gpio.h>
  31 #include <asm/mach/bfin_serial_5xx.h>
  32
  33 #ifdef CONFIG_SERIAL_BFIN_DMA
  34 #include <linux/dma-mapping.h>
  35 #include <asm/io.h>
  36 #include <asm/irq.h>
  37 #include <asm/cacheflush.h>
  38 #endif
  39
  40 /* UART name and device definitions */
  41 #define BFIN_SERIAL_NAME        "ttyBF"
  42 #define BFIN_SERIAL_MAJOR       204
  43 #define BFIN_SERIAL_MINOR       64
  44
  45 /*
  46  * Setup for console. Argument comes from the menuconfig
  47  */
  48 #define DMA_RX_XCOUNT           512
  49 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  50
  51 #define DMA_RX_FLUSH_JIFFIES    5
  52
  53 #ifdef CONFIG_SERIAL_BFIN_DMA
  54 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  55 #else
  56 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  57 #endif
  58
  59 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
  60
  61 /*
  62  * interrupts are disabled on entry
  63  */
  64 static void bfin_serial_stop_tx(struct uart_port *port)
  65 {
  66         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  67         struct circ_buf *xmit = &uart->port.info->xmit;
  68 #if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
  69         unsigned short ier;
  70 #endif
  71
  72         while (!(UART_GET_LSR(uart) & TEMT))
  73                 cpu_relax();
  74
  75 #ifdef CONFIG_SERIAL_BFIN_DMA
  76         disable_dma(uart->tx_dma_channel);
  77         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
  78         uart->port.icount.tx += uart->tx_count;
  79         uart->tx_count = 0;
  80         uart->tx_done = 1;
  81 #else
  82 #ifdef CONFIG_BF54x
  83         /* Clear TFI bit */
  84         UART_PUT_LSR(uart, TFI);
  85         UART_CLEAR_IER(uart, ETBEI);
  86 #else
  87         ier = UART_GET_IER(uart);
  88         ier &= ~ETBEI;
  89         UART_PUT_IER(uart, ier);
  90 #endif
  91 #endif
  92 }
  93
  94 /*
  95  * port is locked and interrupts are disabled
  96  */
  97 static void bfin_serial_start_tx(struct uart_port *port)
  98 {
  99         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 100
 101 #ifdef CONFIG_SERIAL_BFIN_DMA
 102         if (uart->tx_done)
 103                 bfin_serial_dma_tx_chars(uart);
 104 #else
 105 #ifdef CONFIG_BF54x
 106         UART_SET_IER(uart, ETBEI);
 107 #else
 108         unsigned short ier;
 109         ier = UART_GET_IER(uart);
 110         ier |= ETBEI;
 111         UART_PUT_IER(uart, ier);
 112 #endif
 113         bfin_serial_tx_chars(uart);
 114 #endif
 115 }
 116
 117 /*
 118  * Interrupts are enabled
 119  */
 120 static void bfin_serial_stop_rx(struct uart_port *port)
 121 {
 122         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 123 #ifdef  CONFIG_KGDB_UART
 124         if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 125 #endif
 126 #ifdef CONFIG_BF54x
 127         UART_CLEAR_IER(uart, ERBFI);
 128 #else
 129         unsigned short ier;
 130
 131         ier = UART_GET_IER(uart);
 132         ier &= ~ERBFI;
 133         UART_PUT_IER(uart, ier);
 134 #endif
 135 #ifdef  CONFIG_KGDB_UART
 136         }
 137 #endif
 138 }
 139
 140 /*
 141  * Set the modem control timer to fire immediately.
 142  */
 143 static void bfin_serial_enable_ms(struct uart_port *port)
 144 {
 145 }
 146
 147 #ifdef CONFIG_KGDB_UART
 148 static int kgdb_entry_state;
 149
 150 void kgdb_put_debug_char(int chr)
 151 {
 152         struct bfin_serial_port *uart;
 153
 154         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 155                 uart = &bfin_serial_ports[0];
 156         else
 157                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 158
 159         while (!(UART_GET_LSR(uart) & THRE)) {
 160                 SSYNC();
 161         }
 162
 163 #ifndef CONFIG_BF54x
 164         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 165         SSYNC();
 166 #endif
 167         UART_PUT_CHAR(uart, (unsigned char)chr);
 168         SSYNC();
 169 }
 170
 171 int kgdb_get_debug_char(void)
 172 {
 173         struct bfin_serial_port *uart;
 174         unsigned char chr;
 175
 176         if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
 177                 uart = &bfin_serial_ports[0];
 178         else
 179                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 180
 181         while(!(UART_GET_LSR(uart) & DR)) {
 182                 SSYNC();
 183         }
 184 #ifndef CONFIG_BF54x
 185         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 186         SSYNC();
 187 #endif
 188         chr = UART_GET_CHAR(uart);
 189         SSYNC();
 190
 191         return chr;
 192 }
 193 #endif
 194
 195 #if ANOMALY_05000230 && defined(CONFIG_SERIAL_BFIN_PIO)
 196 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 197 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 198 #else
 199 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 200 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 201 #endif
 202
 203 #ifdef CONFIG_SERIAL_BFIN_PIO
 204 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 205 {
 206         struct tty_struct *tty = uart->port.info->tty;
 207         unsigned int status, ch, flg;
 208         static struct timeval anomaly_start = { .tv_sec = 0 };
 209 #ifdef CONFIG_KGDB_UART
 210         struct pt_regs *regs = get_irq_regs();
 211 #endif
 212
 213         status = UART_GET_LSR(uart);
 214         UART_CLEAR_LSR(uart);
 215
 216         ch = UART_GET_CHAR(uart);
 217         uart->port.icount.rx++;
 218
 219 #ifdef CONFIG_KGDB_UART
 220         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
 221                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
 222                         kgdb_breakkey_pressed(regs);
 223                         return;
 224                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
 225                         kgdb_entry_state = 1;
 226                 } else if (kgdb_entry_state == 1 && ch == 'q') {
 227                         kgdb_entry_state = 0;
 228                         kgdb_breakkey_pressed(regs);
 229                         return;
 230                 } else if (ch == 0x3) {/* Ctrl + C */
 231                         kgdb_entry_state = 0;
 232                         kgdb_breakkey_pressed(regs);
 233                         return;
 234                 } else {
 235                         kgdb_entry_state = 0;
 236                 }
 237         }
 238 #endif
 239
 240         if (ANOMALY_05000230) {
 241                 /* The BF533 (and BF561) family of processors have a nice anomaly
 242                  * where they continuously generate characters for a "single" break.
 243                  * We have to basically ignore this flood until the "next" valid
 244                  * character comes across.  Due to the nature of the flood, it is
 245                  * not possible to reliably catch bytes that are sent too quickly
 246                  * after this break.  So application code talking to the Blackfin
 247                  * which sends a break signal must allow at least 1.5 character
 248                  * times after the end of the break for things to stabilize.  This
 249                  * timeout was picked as it must absolutely be larger than 1
 250                  * character time +/- some percent.  So 1.5 sounds good.  All other
 251                  * Blackfin families operate properly.  Woo.
 252                  * Note: While Anomaly 05000230 does not directly address this,
 253                  *       the changes that went in for it also fixed this issue.
 254                  *       That anomaly was fixed in 0.5+ silicon.  I like bunnies.
 255                  */
 256                 if (anomaly_start.tv_sec) {
 257                         struct timeval curr;
 258                         suseconds_t usecs;
 259
 260                         if ((~ch & (~ch + 1)) & 0xff)
 261                                 goto known_good_char;
 262
 263                         do_gettimeofday(&curr);
 264                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
 265                                 goto known_good_char;
 266
 267                         usecs = 0;
 268                         if (curr.tv_sec != anomaly_start.tv_sec)
 269                                 usecs += USEC_PER_SEC;
 270                         usecs += curr.tv_usec - anomaly_start.tv_usec;
 271
 272                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
 273                                 goto known_good_char;
 274
 275                         if (ch)
 276                                 anomaly_start.tv_sec = 0;
 277                         else
 278                                 anomaly_start = curr;
 279
 280                         return;
 281
 282  known_good_char:
 283                         anomaly_start.tv_sec = 0;
 284                 }
 285         }
 286
 287         if (status & BI) {
 288                 if (ANOMALY_05000230)
 289                         if (bfin_revid() < 5)
 290                                 do_gettimeofday(&anomaly_start);
 291                 uart->port.icount.brk++;
 292                 if (uart_handle_break(&uart->port))
 293                         goto ignore_char;
 294                 status &= ~(PE | FE);
 295         }
 296         if (status & PE)
 297                 uart->port.icount.parity++;
 298         if (status & OE)
 299                 uart->port.icount.overrun++;
 300         if (status & FE)
 301                 uart->port.icount.frame++;
 302
 303         status &= uart->port.read_status_mask;
 304
 305         if (status & BI)
 306                 flg = TTY_BREAK;
 307         else if (status & PE)
 308                 flg = TTY_PARITY;
 309         else if (status & FE)
 310                 flg = TTY_FRAME;
 311         else
 312                 flg = TTY_NORMAL;
 313
 314         if (uart_handle_sysrq_char(&uart->port, ch))
 315                 goto ignore_char;
 316
 317         uart_insert_char(&uart->port, status, OE, ch, flg);
 318
 319  ignore_char:
 320         tty_flip_buffer_push(tty);
 321 }
 322
 323 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 324 {
 325         struct circ_buf *xmit = &uart->port.info->xmit;
 326
 327         if (uart->port.x_char) {
 328                 UART_PUT_CHAR(uart, uart->port.x_char);
 329                 uart->port.icount.tx++;
 330                 uart->port.x_char = 0;
 331         }
 332         /*
 333          * Check the modem control lines before
 334          * transmitting anything.
 335          */
 336         bfin_serial_mctrl_check(uart);
 337
 338         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 339                 bfin_serial_stop_tx(&uart->port);
 340                 return;
 341         }
 342
 343         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 344                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 345                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 346                 uart->port.icount.tx++;
 347                 SSYNC();
 348         }
 349
 350         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 351                 uart_write_wakeup(&uart->port);
 352
 353         if (uart_circ_empty(xmit))
 354                 bfin_serial_stop_tx(&uart->port);
 355 }
 356
 357 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 358 {
 359         struct bfin_serial_port *uart = dev_id;
 360
 361         spin_lock(&uart->port.lock);
 362         while (UART_GET_LSR(uart) & DR)
 363                 bfin_serial_rx_chars(uart);
 364         spin_unlock(&uart->port.lock);
 365
 366         return IRQ_HANDLED;
 367 }
 368
 369 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 370 {
 371         struct bfin_serial_port *uart = dev_id;
 372
 373         spin_lock(&uart->port.lock);
 374         if (UART_GET_LSR(uart) & THRE)
 375                 bfin_serial_tx_chars(uart);
 376         spin_unlock(&uart->port.lock);
 377
 378         return IRQ_HANDLED;
 379 }
 380 #endif
 381
 382 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 383 static void bfin_serial_do_work(struct work_struct *work)
 384 {
 385         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 386
 387         bfin_serial_mctrl_check(uart);
 388 }
 389 #endif
 390
 391 #ifdef CONFIG_SERIAL_BFIN_DMA
 392 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 393 {
 394         struct circ_buf *xmit = &uart->port.info->xmit;
 395         unsigned short ier;
 396         int flags = 0;
 397
 398         uart->tx_done = 0;
 399
 400         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 401                 uart->tx_count = 0;
 402                 uart->tx_done = 1;
 403                 return;
 404         }
 405
 406         if (uart->port.x_char) {
 407                 UART_PUT_CHAR(uart, uart->port.x_char);
 408                 uart->port.icount.tx++;
 409                 uart->port.x_char = 0;
 410         }
 411
 412         /*
 413          * Check the modem control lines before
 414          * transmitting anything.
 415          */
 416         bfin_serial_mctrl_check(uart);
 417
 418         spin_lock_irqsave(&uart->port.lock, flags);
 419         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 420         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 421                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 422         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 423                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 424         set_dma_config(uart->tx_dma_channel,
 425                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 426                         INTR_ON_BUF,
 427                         DIMENSION_LINEAR,
 428                         DATA_SIZE_8,
 429                         DMA_SYNC_RESTART));
 430         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 431         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 432         set_dma_x_modify(uart->tx_dma_channel, 1);
 433         enable_dma(uart->tx_dma_channel);
 434
 435 #ifdef CONFIG_BF54x
 436         UART_SET_IER(uart, ETBEI);
 437 #else
 438         ier = UART_GET_IER(uart);
 439         ier |= ETBEI;
 440         UART_PUT_IER(uart, ier);
 441 #endif
 442         spin_unlock_irqrestore(&uart->port.lock, flags);
 443 }
 444
 445 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 446 {
 447         struct tty_struct *tty = uart->port.info->tty;
 448         int i, flg, status;
 449
 450         status = UART_GET_LSR(uart);
 451         UART_CLEAR_LSR(uart);
 452
 453         uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
 454
 455         if (status & BI) {
 456                 uart->port.icount.brk++;
 457                 if (uart_handle_break(&uart->port))
 458                         goto dma_ignore_char;
 459                 status &= ~(PE | FE);
 460         }
 461         if (status & PE)
 462                 uart->port.icount.parity++;
 463         if (status & OE)
 464                 uart->port.icount.overrun++;
 465         if (status & FE)
 466                 uart->port.icount.frame++;
 467
 468         status &= uart->port.read_status_mask;
 469
 470         if (status & BI)
 471                 flg = TTY_BREAK;
 472         else if (status & PE)
 473                 flg = TTY_PARITY;
 474         else if (status & FE)
 475                 flg = TTY_FRAME;
 476         else
 477                 flg = TTY_NORMAL;
 478
 479         for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
 480                 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 481                         goto dma_ignore_char;
 482                 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
 483         }
 484
 485  dma_ignore_char:
 486         tty_flip_buffer_push(tty);
 487 }
 488
 489 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 490 {
 491         int x_pos, pos;
 492         int flags = 0;
 493
 494         spin_lock_irqsave(&uart->port.lock, flags);
 495         x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
 496         if (x_pos == DMA_RX_XCOUNT)
 497                 x_pos = 0;
 498
 499         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 500
 501         if (pos>uart->rx_dma_buf.tail) {
 502                 uart->rx_dma_buf.tail = pos;
 503                 bfin_serial_dma_rx_chars(uart);
 504                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 505         }
 506         spin_unlock_irqrestore(&uart->port.lock, flags);
 507         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 508         add_timer(&(uart->rx_dma_timer));
 509 }
 510
 511 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 512 {
 513         struct bfin_serial_port *uart = dev_id;
 514         struct circ_buf *xmit = &uart->port.info->xmit;
 515         unsigned short ier;
 516
 517         spin_lock(&uart->port.lock);
 518         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 519                 disable_dma(uart->tx_dma_channel);
 520                 clear_dma_irqstat(uart->tx_dma_channel);
 521 #ifdef CONFIG_BF54x
 522                 UART_CLEAR_IER(uart, ETBEI);
 523 #else
 524                 ier = UART_GET_IER(uart);
 525                 ier &= ~ETBEI;
 526                 UART_PUT_IER(uart, ier);
 527 #endif
 528                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 529                         uart_write_wakeup(&uart->port);
 530
 531                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 532                 uart->port.icount.tx += uart->tx_count;
 533
 534                 bfin_serial_dma_tx_chars(uart);
 535         }
 536
 537         spin_unlock(&uart->port.lock);
 538         return IRQ_HANDLED;
 539 }
 540
 541 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 542 {
 543         struct bfin_serial_port *uart = dev_id;
 544         unsigned short irqstat;
 545
 546         uart->rx_dma_nrows++;
 547         uart->rx_dma_buf.tail = DMA_RX_XCOUNT * uart->rx_dma_nrows;
 548         bfin_serial_dma_rx_chars(uart);
 549         if (uart->rx_dma_nrows >= DMA_RX_YCOUNT) {
 550                 uart->rx_dma_nrows = 0;
 551                 uart->rx_dma_buf.tail = 0;
 552         }
 553         uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 554
 555         spin_lock(&uart->port.lock);
 556         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 557         clear_dma_irqstat(uart->rx_dma_channel);
 558
 559         spin_unlock(&uart->port.lock);
 560         return IRQ_HANDLED;
 561 }
 562 #endif
 563
 564 /*
 565  * Return TIOCSER_TEMT when transmitter is not busy.
 566  */
 567 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 568 {
 569         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 570         unsigned short lsr;
 571
 572         lsr = UART_GET_LSR(uart);
 573         if (lsr & TEMT)
 574                 return TIOCSER_TEMT;
 575         else
 576                 return 0;
 577 }
 578
 579 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 580 {
 581 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 582         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 583         if (uart->cts_pin < 0)
 584                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 585
 586 # ifdef BF54x
 587         if (UART_GET_MSR(uart) & CTS)
 588 # else
 589         if (gpio_get_value(uart->cts_pin))
 590 # endif
 591                 return TIOCM_DSR | TIOCM_CAR;
 592         else
 593 #endif
 594                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 595 }
 596
 597 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 598 {
 599 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 600         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 601         if (uart->rts_pin < 0)
 602                 return;
 603
 604         if (mctrl & TIOCM_RTS)
 605 # ifdef BF54x
 606                 UART_PUT_MCR(uart, UART_GET_MCR(uart) & ~MRTS);
 607 # else
 608                 gpio_set_value(uart->rts_pin, 0);
 609 # endif
 610         else
 611 # ifdef BF54x
 612                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | MRTS);
 613 # else
 614                 gpio_set_value(uart->rts_pin, 1);
 615 # endif
 616 #endif
 617 }
 618
 619 /*
 620  * Handle any change of modem status signal since we were last called.
 621  */
 622 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 623 {
 624 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 625         unsigned int status;
 626         struct uart_info *info = uart->port.info;
 627         struct tty_struct *tty = info->tty;
 628
 629         status = bfin_serial_get_mctrl(&uart->port);
 630         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 631         if (!(status & TIOCM_CTS)) {
 632                 tty->hw_stopped = 1;
 633                 schedule_work(&uart->cts_workqueue);
 634         } else {
 635                 tty->hw_stopped = 0;
 636         }
 637 #endif
 638 }
 639
 640 /*
 641  * Interrupts are always disabled.
 642  */
 643 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 644 {
 645         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 646         u16 lcr = UART_GET_LCR(uart);
 647         if (break_state)
 648                 lcr |= SB;
 649         else
 650                 lcr &= ~SB;
 651         UART_PUT_LCR(uart, lcr);
 652         SSYNC();
 653 }
 654
 655 static int bfin_serial_startup(struct uart_port *port)
 656 {
 657         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 658
 659 #ifdef CONFIG_SERIAL_BFIN_DMA
 660         dma_addr_t dma_handle;
 661
 662         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 663                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 664                 return -EBUSY;
 665         }
 666
 667         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 668                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 669                 free_dma(uart->rx_dma_channel);
 670                 return -EBUSY;
 671         }
 672
 673         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 674         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 675
 676         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 677         uart->rx_dma_buf.head = 0;
 678         uart->rx_dma_buf.tail = 0;
 679         uart->rx_dma_nrows = 0;
 680
 681         set_dma_config(uart->rx_dma_channel,
 682                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 683                                 INTR_ON_ROW, DIMENSION_2D,
 684                                 DATA_SIZE_8,
 685                                 DMA_SYNC_RESTART));
 686         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 687         set_dma_x_modify(uart->rx_dma_channel, 1);
 688         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 689         set_dma_y_modify(uart->rx_dma_channel, 1);
 690         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 691         enable_dma(uart->rx_dma_channel);
 692
 693         uart->rx_dma_timer.data = (unsigned long)(uart);
 694         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 695         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 696         add_timer(&(uart->rx_dma_timer));
 697 #else
 698         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 699              "BFIN_UART_RX", uart)) {
 700 # ifdef CONFIG_KGDB_UART
 701                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
 702 # endif
 703                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 704                 return -EBUSY;
 705 # ifdef CONFIG_KGDB_UART
 706                 }
 707 # endif
 708         }
 709
 710
 711         if (request_irq
 712             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 713              "BFIN_UART_TX", uart)) {
 714                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 715                 free_irq(uart->port.irq, uart);
 716                 return -EBUSY;
 717         }
 718 #endif
 719 #ifdef CONFIG_BF54x
 720         UART_SET_IER(uart, ERBFI);
 721 #else
 722         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 723 #endif
 724         return 0;
 725 }
 726
 727 static void bfin_serial_shutdown(struct uart_port *port)
 728 {
 729         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 730
 731 #ifdef CONFIG_SERIAL_BFIN_DMA
 732         disable_dma(uart->tx_dma_channel);
 733         free_dma(uart->tx_dma_channel);
 734         disable_dma(uart->rx_dma_channel);
 735         free_dma(uart->rx_dma_channel);
 736         del_timer(&(uart->rx_dma_timer));
 737         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 738 #else
 739 #ifdef  CONFIG_KGDB_UART
 740         if (uart->port.line != CONFIG_KGDB_UART_PORT)
 741 #endif
 742         free_irq(uart->port.irq, uart);
 743         free_irq(uart->port.irq+1, uart);
 744 #endif
 745 }
 746
 747 static void
 748 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 749                    struct ktermios *old)
 750 {
 751         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 752         unsigned long flags;
 753         unsigned int baud, quot;
 754         unsigned short val, ier, lsr, lcr = 0;
 755
 756         switch (termios->c_cflag & CSIZE) {
 757         case CS8:
 758                 lcr = WLS(8);
 759                 break;
 760         case CS7:
 761                 lcr = WLS(7);
 762                 break;
 763         case CS6:
 764                 lcr = WLS(6);
 765                 break;
 766         case CS5:
 767                 lcr = WLS(5);
 768                 break;
 769         default:
 770                 printk(KERN_ERR "%s: word lengh not supported\n",
 771                         __FUNCTION__);
 772         }
 773
 774         if (termios->c_cflag & CSTOPB)
 775                 lcr |= STB;
 776         if (termios->c_cflag & PARENB)
 777                 lcr |= PEN;
 778         if (!(termios->c_cflag & PARODD))
 779                 lcr |= EPS;
 780         if (termios->c_cflag & CMSPAR)
 781                 lcr |= STP;
 782
 783         port->read_status_mask = OE;
 784         if (termios->c_iflag & INPCK)
 785                 port->read_status_mask |= (FE | PE);
 786         if (termios->c_iflag & (BRKINT | PARMRK))
 787                 port->read_status_mask |= BI;
 788
 789         /*
 790          * Characters to ignore
 791          */
 792         port->ignore_status_mask = 0;
 793         if (termios->c_iflag & IGNPAR)
 794                 port->ignore_status_mask |= FE | PE;
 795         if (termios->c_iflag & IGNBRK) {
 796                 port->ignore_status_mask |= BI;
 797                 /*
 798                  * If we're ignoring parity and break indicators,
 799                  * ignore overruns too (for real raw support).
 800                  */
 801                 if (termios->c_iflag & IGNPAR)
 802                         port->ignore_status_mask |= OE;
 803         }
 804
 805         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 806         quot = uart_get_divisor(port, baud);
 807         spin_lock_irqsave(&uart->port.lock, flags);
 808
 809         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 810
 811         do {
 812                 lsr = UART_GET_LSR(uart);
 813         } while (!(lsr & TEMT));
 814
 815         /* Disable UART */
 816         ier = UART_GET_IER(uart);
 817 #ifdef CONFIG_BF54x
 818         UART_CLEAR_IER(uart, 0xF);
 819 #else
 820         UART_PUT_IER(uart, 0);
 821 #endif
 822
 823 #ifndef CONFIG_BF54x
 824         /* Set DLAB in LCR to Access DLL and DLH */
 825         val = UART_GET_LCR(uart);
 826         val |= DLAB;
 827         UART_PUT_LCR(uart, val);
 828         SSYNC();
 829 #endif
 830
 831         UART_PUT_DLL(uart, quot & 0xFF);
 832         SSYNC();
 833         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 834         SSYNC();
 835
 836 #ifndef CONFIG_BF54x
 837         /* Clear DLAB in LCR to Access THR RBR IER */
 838         val = UART_GET_LCR(uart);
 839         val &= ~DLAB;
 840         UART_PUT_LCR(uart, val);
 841         SSYNC();
 842 #endif
 843
 844         UART_PUT_LCR(uart, lcr);
 845
 846         /* Enable UART */
 847 #ifdef CONFIG_BF54x
 848         UART_SET_IER(uart, ier);
 849 #else
 850         UART_PUT_IER(uart, ier);
 851 #endif
 852
 853         val = UART_GET_GCTL(uart);
 854         val |= UCEN;
 855         UART_PUT_GCTL(uart, val);
 856
 857         spin_unlock_irqrestore(&uart->port.lock, flags);
 858 }
 859
 860 static const char *bfin_serial_type(struct uart_port *port)
 861 {
 862         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 863
 864         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 865 }
 866
 867 /*
 868  * Release the memory region(s) being used by 'port'.
 869  */
 870 static void bfin_serial_release_port(struct uart_port *port)
 871 {
 872 }
 873
 874 /*
 875  * Request the memory region(s) being used by 'port'.
 876  */
 877 static int bfin_serial_request_port(struct uart_port *port)
 878 {
 879         return 0;
 880 }
 881
 882 /*
 883  * Configure/autoconfigure the port.
 884  */
 885 static void bfin_serial_config_port(struct uart_port *port, int flags)
 886 {
 887         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 888
 889         if (flags & UART_CONFIG_TYPE &&
 890             bfin_serial_request_port(&uart->port) == 0)
 891                 uart->port.type = PORT_BFIN;
 892 }
 893
 894 /*
 895  * Verify the new serial_struct (for TIOCSSERIAL).
 896  * The only change we allow are to the flags and type, and
 897  * even then only between PORT_BFIN and PORT_UNKNOWN
 898  */
 899 static int
 900 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 901 {
 902         return 0;
 903 }
 904
 905 static struct uart_ops bfin_serial_pops = {
 906         .tx_empty       = bfin_serial_tx_empty,
 907         .set_mctrl      = bfin_serial_set_mctrl,
 908         .get_mctrl      = bfin_serial_get_mctrl,
 909         .stop_tx        = bfin_serial_stop_tx,
 910         .start_tx       = bfin_serial_start_tx,
 911         .stop_rx        = bfin_serial_stop_rx,
 912         .enable_ms      = bfin_serial_enable_ms,
 913         .break_ctl      = bfin_serial_break_ctl,
 914         .startup        = bfin_serial_startup,
 915         .shutdown       = bfin_serial_shutdown,
 916         .set_termios    = bfin_serial_set_termios,
 917         .type           = bfin_serial_type,
 918         .release_port   = bfin_serial_release_port,
 919         .request_port   = bfin_serial_request_port,
 920         .config_port    = bfin_serial_config_port,
 921         .verify_port    = bfin_serial_verify_port,
 922 };
 923
 924 static void __init bfin_serial_init_ports(void)
 925 {
 926         static int first = 1;
 927         int i;
 928
 929         if (!first)
 930                 return;
 931         first = 0;
 932
 933         for (i = 0; i < nr_ports; i++) {
 934                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 935                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 936                 bfin_serial_ports[i].port.line      = i;
 937                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 938                 bfin_serial_ports[i].port.membase   =
 939                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 940                 bfin_serial_ports[i].port.mapbase   =
 941                         bfin_serial_resource[i].uart_base_addr;
 942                 bfin_serial_ports[i].port.irq       =
 943                         bfin_serial_resource[i].uart_irq;
 944                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 945 #ifdef CONFIG_SERIAL_BFIN_DMA
 946                 bfin_serial_ports[i].tx_done        = 1;
 947                 bfin_serial_ports[i].tx_count       = 0;
 948                 bfin_serial_ports[i].tx_dma_channel =
 949                         bfin_serial_resource[i].uart_tx_dma_channel;
 950                 bfin_serial_ports[i].rx_dma_channel =
 951                         bfin_serial_resource[i].uart_rx_dma_channel;
 952                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 953 #endif
 954 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 955                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 956                 bfin_serial_ports[i].cts_pin        =
 957                         bfin_serial_resource[i].uart_cts_pin;
 958                 bfin_serial_ports[i].rts_pin        =
 959                         bfin_serial_resource[i].uart_rts_pin;
 960 #endif
 961                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 962         }
 963
 964 }
 965
 966 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 967 /*
 968  * If the port was already initialised (eg, by a boot loader),
 969  * try to determine the current setup.
 970  */
 971 static void __init
 972 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 973                            int *parity, int *bits)
 974 {
 975         unsigned short status;
 976
 977         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 978         if (status == (ERBFI | ETBEI)) {
 979                 /* ok, the port was enabled */
 980                 unsigned short lcr, val;
 981                 unsigned short dlh, dll;
 982
 983                 lcr = UART_GET_LCR(uart);
 984
 985                 *parity = 'n';
 986                 if (lcr & PEN) {
 987                         if (lcr & EPS)
 988                                 *parity = 'e';
 989                         else
 990                                 *parity = 'o';
 991                 }
 992                 switch (lcr & 0x03) {
 993                         case 0: *bits = 5; break;
 994                         case 1: *bits = 6; break;
 995                         case 2: *bits = 7; break;
 996                         case 3: *bits = 8; break;
 997                 }
 998 #ifndef CONFIG_BF54x
 999                 /* Set DLAB in LCR to Access DLL and DLH */
1000                 val = UART_GET_LCR(uart);
1001                 val |= DLAB;
1002                 UART_PUT_LCR(uart, val);
1003 #endif
1004
1005                 dll = UART_GET_DLL(uart);
1006                 dlh = UART_GET_DLH(uart);
1007
1008 #ifndef CONFIG_BF54x
1009                 /* Clear DLAB in LCR to Access THR RBR IER */
1010                 val = UART_GET_LCR(uart);
1011                 val &= ~DLAB;
1012                 UART_PUT_LCR(uart, val);
1013 #endif
1014
1015                 *baud = get_sclk() / (16*(dll | dlh << 8));
1016         }
1017         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1018 }
1019 #endif
1020
1021 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1022 static struct uart_driver bfin_serial_reg;
1023
1024 static int __init
1025 bfin_serial_console_setup(struct console *co, char *options)
1026 {
1027         struct bfin_serial_port *uart;
1028 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1029         int baud = 57600;
1030         int bits = 8;
1031         int parity = 'n';
1032 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1033         int flow = 'r';
1034 #  else
1035         int flow = 'n';
1036 #  endif
1037 # endif
1038
1039         /*
1040          * Check whether an invalid uart number has been specified, and
1041          * if so, search for the first available port that does have
1042          * console support.
1043          */
1044         if (co->index == -1 || co->index >= nr_ports)
1045                 co->index = 0;
1046         uart = &bfin_serial_ports[co->index];
1047
1048 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1049         if (options)
1050                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1051         else
1052                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1053
1054         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1055 # else
1056         return 0;
1057 # endif
1058 }
1059 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1060                                  defined (CONFIG_EARLY_PRINTK) */
1061
1062 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1063 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1064 {
1065         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1066         while (!(UART_GET_LSR(uart) & THRE))
1067                 barrier();
1068         UART_PUT_CHAR(uart, ch);
1069         SSYNC();
1070 }
1071
1072 /*
1073  * Interrupts are disabled on entering
1074  */
1075 static void
1076 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1077 {
1078         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1079         int flags = 0;
1080
1081         spin_lock_irqsave(&uart->port.lock, flags);
1082         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1083         spin_unlock_irqrestore(&uart->port.lock, flags);
1084
1085 }
1086
1087 static struct console bfin_serial_console = {
1088         .name           = BFIN_SERIAL_NAME,
1089         .write          = bfin_serial_console_write,
1090         .device         = uart_console_device,
1091         .setup          = bfin_serial_console_setup,
1092         .flags          = CON_PRINTBUFFER,
1093         .index          = -1,
1094         .data           = &bfin_serial_reg,
1095 };
1096
1097 static int __init bfin_serial_rs_console_init(void)
1098 {
1099         bfin_serial_init_ports();
1100         register_console(&bfin_serial_console);
1101 #ifdef CONFIG_KGDB_UART
1102         kgdb_entry_state = 0;
1103         init_kgdb_uart();
1104 #endif
1105         return 0;
1106 }
1107 console_initcall(bfin_serial_rs_console_init);
1108
1109 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1110 #else
1111 #define BFIN_SERIAL_CONSOLE     NULL
1112 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1113
1114
1115 #ifdef CONFIG_EARLY_PRINTK
1116 static __init void early_serial_putc(struct uart_port *port, int ch)
1117 {
1118         unsigned timeout = 0xffff;
1119         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1120
1121         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1122                 cpu_relax();
1123         UART_PUT_CHAR(uart, ch);
1124 }
1125
1126 static __init void early_serial_write(struct console *con, const char *s,
1127                                         unsigned int n)
1128 {
1129         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1130         unsigned int i;
1131
1132         for (i = 0; i < n; i++, s++) {
1133                 if (*s == '\n')
1134                         early_serial_putc(&uart->port, '\r');
1135                 early_serial_putc(&uart->port, *s);
1136         }
1137 }
1138
1139 static struct __init console bfin_early_serial_console = {
1140         .name = "early_BFuart",
1141         .write = early_serial_write,
1142         .device = uart_console_device,
1143         .flags = CON_PRINTBUFFER,
1144         .setup = bfin_serial_console_setup,
1145         .index = -1,
1146         .data  = &bfin_serial_reg,
1147 };
1148
1149 struct console __init *bfin_earlyserial_init(unsigned int port,
1150                                                 unsigned int cflag)
1151 {
1152         struct bfin_serial_port *uart;
1153         struct ktermios t;
1154
1155         if (port == -1 || port >= nr_ports)
1156                 port = 0;
1157         bfin_serial_init_ports();
1158         bfin_early_serial_console.index = port;
1159         uart = &bfin_serial_ports[port];
1160         t.c_cflag = cflag;
1161         t.c_iflag = 0;
1162         t.c_oflag = 0;
1163         t.c_lflag = ICANON;
1164         t.c_line = port;
1165         bfin_serial_set_termios(&uart->port, &t, &t);
1166         return &bfin_early_serial_console;
1167 }
1168
1169 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1170
1171 static struct uart_driver bfin_serial_reg = {
1172         .owner                  = THIS_MODULE,
1173         .driver_name            = "bfin-uart",
1174         .dev_name               = BFIN_SERIAL_NAME,
1175         .major                  = BFIN_SERIAL_MAJOR,
1176         .minor                  = BFIN_SERIAL_MINOR,
1177         .nr                     = NR_PORTS,
1178         .cons                   = BFIN_SERIAL_CONSOLE,
1179 };
1180
1181 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1182 {
1183         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1184
1185         if (uart)
1186                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1187
1188         return 0;
1189 }
1190
1191 static int bfin_serial_resume(struct platform_device *dev)
1192 {
1193         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1194
1195         if (uart)
1196                 uart_resume_port(&bfin_serial_reg, &uart->port);
1197
1198         return 0;
1199 }
1200
1201 static int bfin_serial_probe(struct platform_device *dev)
1202 {
1203         struct resource *res = dev->resource;
1204         int i;
1205
1206         for (i = 0; i < dev->num_resources; i++, res++)
1207                 if (res->flags & IORESOURCE_MEM)
1208                         break;
1209
1210         if (i < dev->num_resources) {
1211                 for (i = 0; i < nr_ports; i++, res++) {
1212                         if (bfin_serial_ports[i].port.mapbase != res->start)
1213                                 continue;
1214                         bfin_serial_ports[i].port.dev = &dev->dev;
1215                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1216                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1217                 }
1218         }
1219
1220         return 0;
1221 }
1222
1223 static int bfin_serial_remove(struct platform_device *pdev)
1224 {
1225         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1226
1227
1228 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1229         gpio_free(uart->cts_pin);
1230         gpio_free(uart->rts_pin);
1231 #endif
1232
1233         platform_set_drvdata(pdev, NULL);
1234
1235         if (uart)
1236                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1237
1238         return 0;
1239 }
1240
1241 static struct platform_driver bfin_serial_driver = {
1242         .probe          = bfin_serial_probe,
1243         .remove         = bfin_serial_remove,
1244         .suspend        = bfin_serial_suspend,
1245         .resume         = bfin_serial_resume,
1246         .driver         = {
1247                 .name   = "bfin-uart",
1248         },
1249 };
1250
1251 static int __init bfin_serial_init(void)
1252 {
1253         int ret;
1254 #ifdef CONFIG_KGDB_UART
1255         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1256         struct ktermios t;
1257 #endif
1258
1259         pr_info("Serial: Blackfin serial driver\n");
1260
1261         bfin_serial_init_ports();
1262
1263         ret = uart_register_driver(&bfin_serial_reg);
1264         if (ret == 0) {
1265                 ret = platform_driver_register(&bfin_serial_driver);
1266                 if (ret) {
1267                         pr_debug("uart register failed\n");
1268                         uart_unregister_driver(&bfin_serial_reg);
1269                 }
1270         }
1271 #ifdef CONFIG_KGDB_UART
1272         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1273                 request_irq(uart->port.irq, bfin_serial_rx_int,
1274                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1275                 pr_info("Request irq for kgdb uart port\n");
1276 #ifdef CONFIG_BF54x
1277                 UART_SET_IER(uart, ERBFI);
1278 #else
1279                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1280 #endif
1281                 SSYNC();
1282                 t.c_cflag = CS8|B57600;
1283                 t.c_iflag = 0;
1284                 t.c_oflag = 0;
1285                 t.c_lflag = ICANON;
1286                 t.c_line = CONFIG_KGDB_UART_PORT;
1287                 bfin_serial_set_termios(&uart->port, &t, &t);
1288         }
1289 #endif
1290         return ret;
1291 }
1292
1293 static void __exit bfin_serial_exit(void)
1294 {
1295         platform_driver_unregister(&bfin_serial_driver);
1296         uart_unregister_driver(&bfin_serial_reg);
1297 }
1298
1299 module_init(bfin_serial_init);
1300 module_exit(bfin_serial_exit);
1301
1302 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1303 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1304 MODULE_LICENSE("GPL");
1305 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);