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    (HZ / 50)
  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
 155                 || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
 156                 uart = &bfin_serial_ports[0];
 157         else
 158                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 159
 160         while (!(UART_GET_LSR(uart) & THRE)) {
 161                 SSYNC();
 162         }
 163
 164 #ifndef CONFIG_BF54x
 165         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 166         SSYNC();
 167 #endif
 168         UART_PUT_CHAR(uart, (unsigned char)chr);
 169         SSYNC();
 170 }
 171
 172 int kgdb_get_debug_char(void)
 173 {
 174         struct bfin_serial_port *uart;
 175         unsigned char chr;
 176
 177         if (CONFIG_KGDB_UART_PORT < 0
 178                 || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
 179                 uart = &bfin_serial_ports[0];
 180         else
 181                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
 182
 183         while(!(UART_GET_LSR(uart) & DR)) {
 184                 SSYNC();
 185         }
 186 #ifndef CONFIG_BF54x
 187         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
 188         SSYNC();
 189 #endif
 190         chr = UART_GET_CHAR(uart);
 191         SSYNC();
 192
 193         return chr;
 194 }
 195 #endif
 196
 197 #if ANOMALY_05000230 && defined(CONFIG_SERIAL_BFIN_PIO)
 198 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 199 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 200 #else
 201 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 202 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 203 #endif
 204
 205 #ifdef CONFIG_SERIAL_BFIN_PIO
 206 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 207 {
 208         struct tty_struct *tty = uart->port.info->tty;
 209         unsigned int status, ch, flg;
 210         static struct timeval anomaly_start = { .tv_sec = 0 };
 211 #ifdef CONFIG_KGDB_UART
 212         struct pt_regs *regs = get_irq_regs();
 213 #endif
 214
 215         status = UART_GET_LSR(uart);
 216         UART_CLEAR_LSR(uart);
 217
 218         ch = UART_GET_CHAR(uart);
 219         uart->port.icount.rx++;
 220
 221 #ifdef CONFIG_KGDB_UART
 222         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
 223                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
 224                         kgdb_breakkey_pressed(regs);
 225                         return;
 226                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
 227                         kgdb_entry_state = 1;
 228                 } else if (kgdb_entry_state == 1 && ch == 'q') {
 229                         kgdb_entry_state = 0;
 230                         kgdb_breakkey_pressed(regs);
 231                         return;
 232                 } else if (ch == 0x3) {/* Ctrl + C */
 233                         kgdb_entry_state = 0;
 234                         kgdb_breakkey_pressed(regs);
 235                         return;
 236                 } else {
 237                         kgdb_entry_state = 0;
 238                 }
 239         }
 240 #endif
 241
 242         if (ANOMALY_05000230) {
 243                 /* The BF533 (and BF561) family of processors have a nice anomaly
 244                  * where they continuously generate characters for a "single" break.
 245                  * We have to basically ignore this flood until the "next" valid
 246                  * character comes across.  Due to the nature of the flood, it is
 247                  * not possible to reliably catch bytes that are sent too quickly
 248                  * after this break.  So application code talking to the Blackfin
 249                  * which sends a break signal must allow at least 1.5 character
 250                  * times after the end of the break for things to stabilize.  This
 251                  * timeout was picked as it must absolutely be larger than 1
 252                  * character time +/- some percent.  So 1.5 sounds good.  All other
 253                  * Blackfin families operate properly.  Woo.
 254                  * Note: While Anomaly 05000230 does not directly address this,
 255                  *       the changes that went in for it also fixed this issue.
 256                  *       That anomaly was fixed in 0.5+ silicon.  I like bunnies.
 257                  */
 258                 if (anomaly_start.tv_sec) {
 259                         struct timeval curr;
 260                         suseconds_t usecs;
 261
 262                         if ((~ch & (~ch + 1)) & 0xff)
 263                                 goto known_good_char;
 264
 265                         do_gettimeofday(&curr);
 266                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
 267                                 goto known_good_char;
 268
 269                         usecs = 0;
 270                         if (curr.tv_sec != anomaly_start.tv_sec)
 271                                 usecs += USEC_PER_SEC;
 272                         usecs += curr.tv_usec - anomaly_start.tv_usec;
 273
 274                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
 275                                 goto known_good_char;
 276
 277                         if (ch)
 278                                 anomaly_start.tv_sec = 0;
 279                         else
 280                                 anomaly_start = curr;
 281
 282                         return;
 283
 284  known_good_char:
 285                         anomaly_start.tv_sec = 0;
 286                 }
 287         }
 288
 289         if (status & BI) {
 290                 if (ANOMALY_05000230)
 291                         if (bfin_revid() < 5)
 292                                 do_gettimeofday(&anomaly_start);
 293                 uart->port.icount.brk++;
 294                 if (uart_handle_break(&uart->port))
 295                         goto ignore_char;
 296                 status &= ~(PE | FE);
 297         }
 298         if (status & PE)
 299                 uart->port.icount.parity++;
 300         if (status & OE)
 301                 uart->port.icount.overrun++;
 302         if (status & FE)
 303                 uart->port.icount.frame++;
 304
 305         status &= uart->port.read_status_mask;
 306
 307         if (status & BI)
 308                 flg = TTY_BREAK;
 309         else if (status & PE)
 310                 flg = TTY_PARITY;
 311         else if (status & FE)
 312                 flg = TTY_FRAME;
 313         else
 314                 flg = TTY_NORMAL;
 315
 316         if (uart_handle_sysrq_char(&uart->port, ch))
 317                 goto ignore_char;
 318
 319         uart_insert_char(&uart->port, status, OE, ch, flg);
 320
 321  ignore_char:
 322         tty_flip_buffer_push(tty);
 323 }
 324
 325 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 326 {
 327         struct circ_buf *xmit = &uart->port.info->xmit;
 328
 329         if (uart->port.x_char) {
 330                 UART_PUT_CHAR(uart, uart->port.x_char);
 331                 uart->port.icount.tx++;
 332                 uart->port.x_char = 0;
 333         }
 334         /*
 335          * Check the modem control lines before
 336          * transmitting anything.
 337          */
 338         bfin_serial_mctrl_check(uart);
 339
 340         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 341                 bfin_serial_stop_tx(&uart->port);
 342                 return;
 343         }
 344
 345         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 346                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 347                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 348                 uart->port.icount.tx++;
 349                 SSYNC();
 350         }
 351
 352         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 353                 uart_write_wakeup(&uart->port);
 354
 355         if (uart_circ_empty(xmit))
 356                 bfin_serial_stop_tx(&uart->port);
 357 }
 358
 359 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 360 {
 361         struct bfin_serial_port *uart = dev_id;
 362
 363         spin_lock(&uart->port.lock);
 364         while (UART_GET_LSR(uart) & DR)
 365                 bfin_serial_rx_chars(uart);
 366         spin_unlock(&uart->port.lock);
 367
 368         return IRQ_HANDLED;
 369 }
 370
 371 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 372 {
 373         struct bfin_serial_port *uart = dev_id;
 374
 375         spin_lock(&uart->port.lock);
 376         if (UART_GET_LSR(uart) & THRE)
 377                 bfin_serial_tx_chars(uart);
 378         spin_unlock(&uart->port.lock);
 379
 380         return IRQ_HANDLED;
 381 }
 382 #endif
 383
 384 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 385 static void bfin_serial_do_work(struct work_struct *work)
 386 {
 387         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 388
 389         bfin_serial_mctrl_check(uart);
 390 }
 391 #endif
 392
 393 #ifdef CONFIG_SERIAL_BFIN_DMA
 394 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 395 {
 396         struct circ_buf *xmit = &uart->port.info->xmit;
 397         unsigned short ier;
 398
 399         uart->tx_done = 0;
 400
 401         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 402                 uart->tx_count = 0;
 403                 uart->tx_done = 1;
 404                 return;
 405         }
 406
 407         if (uart->port.x_char) {
 408                 UART_PUT_CHAR(uart, uart->port.x_char);
 409                 uart->port.icount.tx++;
 410                 uart->port.x_char = 0;
 411         }
 412
 413         /*
 414          * Check the modem control lines before
 415          * transmitting anything.
 416          */
 417         bfin_serial_mctrl_check(uart);
 418
 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 }
 443
 444 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 445 {
 446         struct tty_struct *tty = uart->port.info->tty;
 447         int i, flg, status;
 448
 449         status = UART_GET_LSR(uart);
 450         UART_CLEAR_LSR(uart);
 451
 452         uart->port.icount.rx +=
 453                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 454                 UART_XMIT_SIZE);
 455
 456         if (status & BI) {
 457                 uart->port.icount.brk++;
 458                 if (uart_handle_break(&uart->port))
 459                         goto dma_ignore_char;
 460                 status &= ~(PE | FE);
 461         }
 462         if (status & PE)
 463                 uart->port.icount.parity++;
 464         if (status & OE)
 465                 uart->port.icount.overrun++;
 466         if (status & FE)
 467                 uart->port.icount.frame++;
 468
 469         status &= uart->port.read_status_mask;
 470
 471         if (status & BI)
 472                 flg = TTY_BREAK;
 473         else if (status & PE)
 474                 flg = TTY_PARITY;
 475         else if (status & FE)
 476                 flg = TTY_FRAME;
 477         else
 478                 flg = TTY_NORMAL;
 479
 480         for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
 481                 if (i >= UART_XMIT_SIZE)
 482                         i = 0;
 483                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 484                         uart_insert_char(&uart->port, status, OE,
 485                                 uart->rx_dma_buf.buf[i], flg);
 486         }
 487
 488  dma_ignore_char:
 489         tty_flip_buffer_push(tty);
 490 }
 491
 492 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 493 {
 494         int x_pos, pos;
 495
 496         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 497         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 498         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 499         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
 500                 uart->rx_dma_nrows = 0;
 501         x_pos = DMA_RX_XCOUNT - x_pos;
 502         if (x_pos == DMA_RX_XCOUNT)
 503                 x_pos = 0;
 504
 505         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 506         if (pos != uart->rx_dma_buf.tail) {
 507                 uart->rx_dma_buf.head = pos;
 508                 bfin_serial_dma_rx_chars(uart);
 509                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 510         }
 511
 512         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 513         add_timer(&(uart->rx_dma_timer));
 514 }
 515
 516 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 517 {
 518         struct bfin_serial_port *uart = dev_id;
 519         struct circ_buf *xmit = &uart->port.info->xmit;
 520         unsigned short ier;
 521
 522         spin_lock(&uart->port.lock);
 523         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 524                 disable_dma(uart->tx_dma_channel);
 525                 clear_dma_irqstat(uart->tx_dma_channel);
 526 #ifdef CONFIG_BF54x
 527                 UART_CLEAR_IER(uart, ETBEI);
 528 #else
 529                 ier = UART_GET_IER(uart);
 530                 ier &= ~ETBEI;
 531                 UART_PUT_IER(uart, ier);
 532 #endif
 533                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 534                 uart->port.icount.tx += uart->tx_count;
 535
 536                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 537                         uart_write_wakeup(&uart->port);
 538
 539                 bfin_serial_dma_tx_chars(uart);
 540         }
 541
 542         spin_unlock(&uart->port.lock);
 543         return IRQ_HANDLED;
 544 }
 545
 546 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 547 {
 548         struct bfin_serial_port *uart = dev_id;
 549         unsigned short irqstat;
 550
 551         spin_lock(&uart->port.lock);
 552         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 553         clear_dma_irqstat(uart->rx_dma_channel);
 554         spin_unlock(&uart->port.lock);
 555
 556         del_timer(&(uart->rx_dma_timer));
 557         uart->rx_dma_timer.expires = jiffies;
 558         add_timer(&(uart->rx_dma_timer));
 559
 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, 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         /* Disable UART */
 812         ier = UART_GET_IER(uart);
 813 #ifdef CONFIG_BF54x
 814         UART_CLEAR_IER(uart, 0xF);
 815 #else
 816         UART_PUT_IER(uart, 0);
 817 #endif
 818
 819 #ifndef CONFIG_BF54x
 820         /* Set DLAB in LCR to Access DLL and DLH */
 821         val = UART_GET_LCR(uart);
 822         val |= DLAB;
 823         UART_PUT_LCR(uart, val);
 824         SSYNC();
 825 #endif
 826
 827         UART_PUT_DLL(uart, quot & 0xFF);
 828         SSYNC();
 829         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 830         SSYNC();
 831
 832 #ifndef CONFIG_BF54x
 833         /* Clear DLAB in LCR to Access THR RBR IER */
 834         val = UART_GET_LCR(uart);
 835         val &= ~DLAB;
 836         UART_PUT_LCR(uart, val);
 837         SSYNC();
 838 #endif
 839
 840         UART_PUT_LCR(uart, lcr);
 841
 842         /* Enable UART */
 843 #ifdef CONFIG_BF54x
 844         UART_SET_IER(uart, ier);
 845 #else
 846         UART_PUT_IER(uart, ier);
 847 #endif
 848
 849         val = UART_GET_GCTL(uart);
 850         val |= UCEN;
 851         UART_PUT_GCTL(uart, val);
 852
 853         spin_unlock_irqrestore(&uart->port.lock, flags);
 854 }
 855
 856 static const char *bfin_serial_type(struct uart_port *port)
 857 {
 858         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 859
 860         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 861 }
 862
 863 /*
 864  * Release the memory region(s) being used by 'port'.
 865  */
 866 static void bfin_serial_release_port(struct uart_port *port)
 867 {
 868 }
 869
 870 /*
 871  * Request the memory region(s) being used by 'port'.
 872  */
 873 static int bfin_serial_request_port(struct uart_port *port)
 874 {
 875         return 0;
 876 }
 877
 878 /*
 879  * Configure/autoconfigure the port.
 880  */
 881 static void bfin_serial_config_port(struct uart_port *port, int flags)
 882 {
 883         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 884
 885         if (flags & UART_CONFIG_TYPE &&
 886             bfin_serial_request_port(&uart->port) == 0)
 887                 uart->port.type = PORT_BFIN;
 888 }
 889
 890 /*
 891  * Verify the new serial_struct (for TIOCSSERIAL).
 892  * The only change we allow are to the flags and type, and
 893  * even then only between PORT_BFIN and PORT_UNKNOWN
 894  */
 895 static int
 896 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 897 {
 898         return 0;
 899 }
 900
 901 /*
 902  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 903  * In other cases, disable IrDA function.
 904  */
 905 static void bfin_set_ldisc(struct tty_struct *tty)
 906 {
 907         int line = tty->index;
 908         unsigned short val;
 909
 910         if (line >= tty->driver->num)
 911                 return;
 912
 913         switch (tty->ldisc.num) {
 914         case N_IRDA:
 915                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 916                 val |= (IREN | RPOLC);
 917                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 918                 break;
 919         default:
 920                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 921                 val &= ~(IREN | RPOLC);
 922                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 923         }
 924 }
 925
 926 static struct uart_ops bfin_serial_pops = {
 927         .tx_empty       = bfin_serial_tx_empty,
 928         .set_mctrl      = bfin_serial_set_mctrl,
 929         .get_mctrl      = bfin_serial_get_mctrl,
 930         .stop_tx        = bfin_serial_stop_tx,
 931         .start_tx       = bfin_serial_start_tx,
 932         .stop_rx        = bfin_serial_stop_rx,
 933         .enable_ms      = bfin_serial_enable_ms,
 934         .break_ctl      = bfin_serial_break_ctl,
 935         .startup        = bfin_serial_startup,
 936         .shutdown       = bfin_serial_shutdown,
 937         .set_termios    = bfin_serial_set_termios,
 938         .type           = bfin_serial_type,
 939         .release_port   = bfin_serial_release_port,
 940         .request_port   = bfin_serial_request_port,
 941         .config_port    = bfin_serial_config_port,
 942         .verify_port    = bfin_serial_verify_port,
 943 };
 944
 945 static void __init bfin_serial_init_ports(void)
 946 {
 947         static int first = 1;
 948         int i;
 949
 950         if (!first)
 951                 return;
 952         first = 0;
 953
 954         for (i = 0; i < nr_ports; i++) {
 955                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 956                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 957                 bfin_serial_ports[i].port.line      = i;
 958                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 959                 bfin_serial_ports[i].port.membase   =
 960                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 961                 bfin_serial_ports[i].port.mapbase   =
 962                         bfin_serial_resource[i].uart_base_addr;
 963                 bfin_serial_ports[i].port.irq       =
 964                         bfin_serial_resource[i].uart_irq;
 965                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 966 #ifdef CONFIG_SERIAL_BFIN_DMA
 967                 bfin_serial_ports[i].tx_done        = 1;
 968                 bfin_serial_ports[i].tx_count       = 0;
 969                 bfin_serial_ports[i].tx_dma_channel =
 970                         bfin_serial_resource[i].uart_tx_dma_channel;
 971                 bfin_serial_ports[i].rx_dma_channel =
 972                         bfin_serial_resource[i].uart_rx_dma_channel;
 973                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 974 #endif
 975 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 976                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 977                 bfin_serial_ports[i].cts_pin        =
 978                         bfin_serial_resource[i].uart_cts_pin;
 979                 bfin_serial_ports[i].rts_pin        =
 980                         bfin_serial_resource[i].uart_rts_pin;
 981 #endif
 982                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 983         }
 984
 985 }
 986
 987 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 988 /*
 989  * If the port was already initialised (eg, by a boot loader),
 990  * try to determine the current setup.
 991  */
 992 static void __init
 993 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 994                            int *parity, int *bits)
 995 {
 996         unsigned short status;
 997
 998         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 999         if (status == (ERBFI | ETBEI)) {
1000                 /* ok, the port was enabled */
1001                 unsigned short lcr, val;
1002                 unsigned short dlh, dll;
1003
1004                 lcr = UART_GET_LCR(uart);
1005
1006                 *parity = 'n';
1007                 if (lcr & PEN) {
1008                         if (lcr & EPS)
1009                                 *parity = 'e';
1010                         else
1011                                 *parity = 'o';
1012                 }
1013                 switch (lcr & 0x03) {
1014                         case 0: *bits = 5; break;
1015                         case 1: *bits = 6; break;
1016                         case 2: *bits = 7; break;
1017                         case 3: *bits = 8; break;
1018                 }
1019 #ifndef CONFIG_BF54x
1020                 /* Set DLAB in LCR to Access DLL and DLH */
1021                 val = UART_GET_LCR(uart);
1022                 val |= DLAB;
1023                 UART_PUT_LCR(uart, val);
1024 #endif
1025
1026                 dll = UART_GET_DLL(uart);
1027                 dlh = UART_GET_DLH(uart);
1028
1029 #ifndef CONFIG_BF54x
1030                 /* Clear DLAB in LCR to Access THR RBR IER */
1031                 val = UART_GET_LCR(uart);
1032                 val &= ~DLAB;
1033                 UART_PUT_LCR(uart, val);
1034 #endif
1035
1036                 *baud = get_sclk() / (16*(dll | dlh << 8));
1037         }
1038         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1039 }
1040 #endif
1041
1042 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1043 static struct uart_driver bfin_serial_reg;
1044
1045 static int __init
1046 bfin_serial_console_setup(struct console *co, char *options)
1047 {
1048         struct bfin_serial_port *uart;
1049 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1050         int baud = 57600;
1051         int bits = 8;
1052         int parity = 'n';
1053 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1054         int flow = 'r';
1055 #  else
1056         int flow = 'n';
1057 #  endif
1058 # endif
1059
1060         /*
1061          * Check whether an invalid uart number has been specified, and
1062          * if so, search for the first available port that does have
1063          * console support.
1064          */
1065         if (co->index == -1 || co->index >= nr_ports)
1066                 co->index = 0;
1067         uart = &bfin_serial_ports[co->index];
1068
1069 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1070         if (options)
1071                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1072         else
1073                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1074
1075         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1076 # else
1077         return 0;
1078 # endif
1079 }
1080 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1081                                  defined (CONFIG_EARLY_PRINTK) */
1082
1083 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1084 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1085 {
1086         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1087         while (!(UART_GET_LSR(uart) & THRE))
1088                 barrier();
1089         UART_PUT_CHAR(uart, ch);
1090         SSYNC();
1091 }
1092
1093 /*
1094  * Interrupts are disabled on entering
1095  */
1096 static void
1097 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1098 {
1099         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1100         int flags = 0;
1101
1102         spin_lock_irqsave(&uart->port.lock, flags);
1103         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1104         spin_unlock_irqrestore(&uart->port.lock, flags);
1105
1106 }
1107
1108 static struct console bfin_serial_console = {
1109         .name           = BFIN_SERIAL_NAME,
1110         .write          = bfin_serial_console_write,
1111         .device         = uart_console_device,
1112         .setup          = bfin_serial_console_setup,
1113         .flags          = CON_PRINTBUFFER,
1114         .index          = -1,
1115         .data           = &bfin_serial_reg,
1116 };
1117
1118 static int __init bfin_serial_rs_console_init(void)
1119 {
1120         bfin_serial_init_ports();
1121         register_console(&bfin_serial_console);
1122 #ifdef CONFIG_KGDB_UART
1123         kgdb_entry_state = 0;
1124         init_kgdb_uart();
1125 #endif
1126         return 0;
1127 }
1128 console_initcall(bfin_serial_rs_console_init);
1129
1130 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1131 #else
1132 #define BFIN_SERIAL_CONSOLE     NULL
1133 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1134
1135
1136 #ifdef CONFIG_EARLY_PRINTK
1137 static __init void early_serial_putc(struct uart_port *port, int ch)
1138 {
1139         unsigned timeout = 0xffff;
1140         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1141
1142         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1143                 cpu_relax();
1144         UART_PUT_CHAR(uart, ch);
1145 }
1146
1147 static __init void early_serial_write(struct console *con, const char *s,
1148                                         unsigned int n)
1149 {
1150         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1151         unsigned int i;
1152
1153         for (i = 0; i < n; i++, s++) {
1154                 if (*s == '\n')
1155                         early_serial_putc(&uart->port, '\r');
1156                 early_serial_putc(&uart->port, *s);
1157         }
1158 }
1159
1160 static struct __init console bfin_early_serial_console = {
1161         .name = "early_BFuart",
1162         .write = early_serial_write,
1163         .device = uart_console_device,
1164         .flags = CON_PRINTBUFFER,
1165         .setup = bfin_serial_console_setup,
1166         .index = -1,
1167         .data  = &bfin_serial_reg,
1168 };
1169
1170 struct console __init *bfin_earlyserial_init(unsigned int port,
1171                                                 unsigned int cflag)
1172 {
1173         struct bfin_serial_port *uart;
1174         struct ktermios t;
1175
1176         if (port == -1 || port >= nr_ports)
1177                 port = 0;
1178         bfin_serial_init_ports();
1179         bfin_early_serial_console.index = port;
1180         uart = &bfin_serial_ports[port];
1181         t.c_cflag = cflag;
1182         t.c_iflag = 0;
1183         t.c_oflag = 0;
1184         t.c_lflag = ICANON;
1185         t.c_line = port;
1186         bfin_serial_set_termios(&uart->port, &t, &t);
1187         return &bfin_early_serial_console;
1188 }
1189
1190 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1191
1192 static struct uart_driver bfin_serial_reg = {
1193         .owner                  = THIS_MODULE,
1194         .driver_name            = "bfin-uart",
1195         .dev_name               = BFIN_SERIAL_NAME,
1196         .major                  = BFIN_SERIAL_MAJOR,
1197         .minor                  = BFIN_SERIAL_MINOR,
1198         .nr                     = BFIN_UART_NR_PORTS,
1199         .cons                   = BFIN_SERIAL_CONSOLE,
1200 };
1201
1202 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1203 {
1204         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1205
1206         if (uart)
1207                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1208
1209         return 0;
1210 }
1211
1212 static int bfin_serial_resume(struct platform_device *dev)
1213 {
1214         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1215
1216         if (uart)
1217                 uart_resume_port(&bfin_serial_reg, &uart->port);
1218
1219         return 0;
1220 }
1221
1222 static int bfin_serial_probe(struct platform_device *dev)
1223 {
1224         struct resource *res = dev->resource;
1225         int i;
1226
1227         for (i = 0; i < dev->num_resources; i++, res++)
1228                 if (res->flags & IORESOURCE_MEM)
1229                         break;
1230
1231         if (i < dev->num_resources) {
1232                 for (i = 0; i < nr_ports; i++, res++) {
1233                         if (bfin_serial_ports[i].port.mapbase != res->start)
1234                                 continue;
1235                         bfin_serial_ports[i].port.dev = &dev->dev;
1236                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1237                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1238                 }
1239         }
1240
1241         return 0;
1242 }
1243
1244 static int bfin_serial_remove(struct platform_device *pdev)
1245 {
1246         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1247
1248
1249 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1250         gpio_free(uart->cts_pin);
1251         gpio_free(uart->rts_pin);
1252 #endif
1253
1254         platform_set_drvdata(pdev, NULL);
1255
1256         if (uart)
1257                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1258
1259         return 0;
1260 }
1261
1262 static struct platform_driver bfin_serial_driver = {
1263         .probe          = bfin_serial_probe,
1264         .remove         = bfin_serial_remove,
1265         .suspend        = bfin_serial_suspend,
1266         .resume         = bfin_serial_resume,
1267         .driver         = {
1268                 .name   = "bfin-uart",
1269                 .owner  = THIS_MODULE,
1270         },
1271 };
1272
1273 static int __init bfin_serial_init(void)
1274 {
1275         int ret;
1276 #ifdef CONFIG_KGDB_UART
1277         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1278         struct ktermios t;
1279 #endif
1280
1281         pr_info("Serial: Blackfin serial driver\n");
1282
1283         bfin_serial_init_ports();
1284
1285         ret = uart_register_driver(&bfin_serial_reg);
1286         if (ret == 0) {
1287                 bfin_serial_reg.tty_driver->set_ldisc = bfin_set_ldisc;
1288                 ret = platform_driver_register(&bfin_serial_driver);
1289                 if (ret) {
1290                         pr_debug("uart register failed\n");
1291                         uart_unregister_driver(&bfin_serial_reg);
1292                 }
1293         }
1294 #ifdef CONFIG_KGDB_UART
1295         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1296                 request_irq(uart->port.irq, bfin_serial_rx_int,
1297                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1298                 pr_info("Request irq for kgdb uart port\n");
1299 #ifdef CONFIG_BF54x
1300                 UART_SET_IER(uart, ERBFI);
1301 #else
1302                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1303 #endif
1304                 SSYNC();
1305                 t.c_cflag = CS8|B57600;
1306                 t.c_iflag = 0;
1307                 t.c_oflag = 0;
1308                 t.c_lflag = ICANON;
1309                 t.c_line = CONFIG_KGDB_UART_PORT;
1310                 bfin_serial_set_termios(&uart->port, &t, &t);
1311         }
1312 #endif
1313         return ret;
1314 }
1315
1316 static void __exit bfin_serial_exit(void)
1317 {
1318         platform_driver_unregister(&bfin_serial_driver);
1319         uart_unregister_driver(&bfin_serial_reg);
1320 }
1321
1322 module_init(bfin_serial_init);
1323 module_exit(bfin_serial_exit);
1324
1325 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1326 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1327 MODULE_LICENSE("GPL");
1328 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1329 MODULE_ALIAS("platform:bfin-uart");