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

   1 /*
   2  * Blackfin On-Chip Serial Driver
   3  *
   4  * Copyright 2006-2008 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 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
  26         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
  27 #include <linux/kgdb.h>
  28 #include <asm/irq_regs.h>
  29 #endif
  30
  31 #include <asm/gpio.h>
  32 #include <mach/bfin_serial_5xx.h>
  33
  34 #ifdef CONFIG_SERIAL_BFIN_DMA
  35 #include <linux/dma-mapping.h>
  36 #include <asm/io.h>
  37 #include <asm/irq.h>
  38 #include <asm/cacheflush.h>
  39 #endif
  40
  41 /* UART name and device definitions */
  42 #define BFIN_SERIAL_NAME        "ttyBF"
  43 #define BFIN_SERIAL_MAJOR       204
  44 #define BFIN_SERIAL_MINOR       64
  45
  46 static struct bfin_serial_port bfin_serial_ports[BFIN_UART_NR_PORTS];
  47 static int nr_active_ports = ARRAY_SIZE(bfin_serial_resource);
  48
  49 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
  50         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
  51
  52 # ifndef CONFIG_SERIAL_BFIN_PIO
  53 #  error KGDB only support UART in PIO mode.
  54 # endif
  55
  56 static int kgdboc_port_line;
  57 static int kgdboc_break_enabled;
  58 #endif
  59 /*
  60  * Setup for console. Argument comes from the menuconfig
  61  */
  62 #define DMA_RX_XCOUNT           512
  63 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  64
  65 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
  66
  67 #ifdef CONFIG_SERIAL_BFIN_DMA
  68 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  69 #else
  70 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  71 #endif
  72
  73 static void bfin_serial_reset_irda(struct uart_port *port);
  74
  75 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
  76         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
  77 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
  78 {
  79         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  80         if (uart->cts_pin < 0)
  81                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
  82
  83         /* CTS PIN is negative assertive. */
  84         if (UART_GET_CTS(uart))
  85                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
  86         else
  87                 return TIOCM_DSR | TIOCM_CAR;
  88 }
  89
  90 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
  91 {
  92         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  93         if (uart->rts_pin < 0)
  94                 return;
  95
  96         /* RTS PIN is negative assertive. */
  97         if (mctrl & TIOCM_RTS)
  98                 UART_ENABLE_RTS(uart);
  99         else
 100                 UART_DISABLE_RTS(uart);
 101 }
 102
 103 /*
 104  * Handle any change of modem status signal.
 105  */
 106 static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
 107 {
 108         struct bfin_serial_port *uart = dev_id;
 109         unsigned int status;
 110
 111         status = bfin_serial_get_mctrl(&uart->port);
 112         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 113 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 114         uart->scts = 1;
 115         UART_CLEAR_SCTS(uart);
 116         UART_CLEAR_IER(uart, EDSSI);
 117 #endif
 118
 119         return IRQ_HANDLED;
 120 }
 121 #else
 122 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 123 {
 124         return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 125 }
 126
 127 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 128 {
 129 }
 130 #endif
 131
 132 /*
 133  * interrupts are disabled on entry
 134  */
 135 static void bfin_serial_stop_tx(struct uart_port *port)
 136 {
 137         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 138 #ifdef CONFIG_SERIAL_BFIN_DMA
 139         struct circ_buf *xmit = &uart->port.info->xmit;
 140 #endif
 141
 142         while (!(UART_GET_LSR(uart) & TEMT))
 143                 cpu_relax();
 144
 145 #ifdef CONFIG_SERIAL_BFIN_DMA
 146         disable_dma(uart->tx_dma_channel);
 147         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 148         uart->port.icount.tx += uart->tx_count;
 149         uart->tx_count = 0;
 150         uart->tx_done = 1;
 151 #else
 152 #ifdef CONFIG_BF54x
 153         /* Clear TFI bit */
 154         UART_PUT_LSR(uart, TFI);
 155 #endif
 156         UART_CLEAR_IER(uart, ETBEI);
 157 #endif
 158 }
 159
 160 /*
 161  * port is locked and interrupts are disabled
 162  */
 163 static void bfin_serial_start_tx(struct uart_port *port)
 164 {
 165         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 166         struct tty_struct *tty = uart->port.info->port.tty;
 167
 168 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 169         if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
 170                 uart->scts = 0;
 171                 uart_handle_cts_change(&uart->port, uart->scts);
 172         }
 173 #endif
 174
 175         /*
 176          * To avoid losting RX interrupt, we reset IR function
 177          * before sending data.
 178          */
 179         if (tty->termios->c_line == N_IRDA)
 180                 bfin_serial_reset_irda(port);
 181
 182 #ifdef CONFIG_SERIAL_BFIN_DMA
 183         if (uart->tx_done)
 184                 bfin_serial_dma_tx_chars(uart);
 185 #else
 186         UART_SET_IER(uart, ETBEI);
 187         bfin_serial_tx_chars(uart);
 188 #endif
 189 }
 190
 191 /*
 192  * Interrupts are enabled
 193  */
 194 static void bfin_serial_stop_rx(struct uart_port *port)
 195 {
 196         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 197
 198         UART_CLEAR_IER(uart, ERBFI);
 199 }
 200
 201 /*
 202  * Set the modem control timer to fire immediately.
 203  */
 204 static void bfin_serial_enable_ms(struct uart_port *port)
 205 {
 206 }
 207
 208
 209 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
 210 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 211 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 212 #else
 213 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 214 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 215 #endif
 216
 217 #ifdef CONFIG_SERIAL_BFIN_PIO
 218 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 219 {
 220         struct tty_struct *tty = NULL;
 221         unsigned int status, ch, flg;
 222         static struct timeval anomaly_start = { .tv_sec = 0 };
 223
 224         status = UART_GET_LSR(uart);
 225         UART_CLEAR_LSR(uart);
 226
 227         ch = UART_GET_CHAR(uart);
 228         uart->port.icount.rx++;
 229
 230 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 231         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 232         if (kgdb_connected && kgdboc_port_line == uart->port.line)
 233                 if (ch == 0x3) {/* Ctrl + C */
 234                         kgdb_breakpoint();
 235                         return;
 236                 }
 237
 238         if (!uart->port.info || !uart->port.info->port.tty)
 239                 return;
 240 #endif
 241         tty = uart->port.info->port.tty;
 242
 243         if (ANOMALY_05000363) {
 244                 /* The BF533 (and BF561) family of processors have a nice anomaly
 245                  * where they continuously generate characters for a "single" break.
 246                  * We have to basically ignore this flood until the "next" valid
 247                  * character comes across.  Due to the nature of the flood, it is
 248                  * not possible to reliably catch bytes that are sent too quickly
 249                  * after this break.  So application code talking to the Blackfin
 250                  * which sends a break signal must allow at least 1.5 character
 251                  * times after the end of the break for things to stabilize.  This
 252                  * timeout was picked as it must absolutely be larger than 1
 253                  * character time +/- some percent.  So 1.5 sounds good.  All other
 254                  * Blackfin families operate properly.  Woo.
 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                         status &= ~BI;
 284                         anomaly_start.tv_sec = 0;
 285                 }
 286         }
 287
 288         if (status & BI) {
 289                 if (ANOMALY_05000363)
 290                         if (bfin_revid() < 5)
 291                                 do_gettimeofday(&anomaly_start);
 292                 uart->port.icount.brk++;
 293                 if (uart_handle_break(&uart->port))
 294                         goto ignore_char;
 295                 status &= ~(PE | FE);
 296         }
 297         if (status & PE)
 298                 uart->port.icount.parity++;
 299         if (status & OE)
 300                 uart->port.icount.overrun++;
 301         if (status & FE)
 302                 uart->port.icount.frame++;
 303
 304         status &= uart->port.read_status_mask;
 305
 306         if (status & BI)
 307                 flg = TTY_BREAK;
 308         else if (status & PE)
 309                 flg = TTY_PARITY;
 310         else if (status & FE)
 311                 flg = TTY_FRAME;
 312         else
 313                 flg = TTY_NORMAL;
 314
 315         if (uart_handle_sysrq_char(&uart->port, ch))
 316                 goto ignore_char;
 317
 318         uart_insert_char(&uart->port, status, OE, ch, flg);
 319
 320  ignore_char:
 321         tty_flip_buffer_push(tty);
 322 }
 323
 324 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 325 {
 326         struct circ_buf *xmit = &uart->port.info->xmit;
 327
 328         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 329 #ifdef CONFIG_BF54x
 330                 /* Clear TFI bit */
 331                 UART_PUT_LSR(uart, TFI);
 332 #endif
 333                 UART_CLEAR_IER(uart, ETBEI);
 334                 return;
 335         }
 336
 337         if (uart->port.x_char) {
 338                 UART_PUT_CHAR(uart, uart->port.x_char);
 339                 uart->port.icount.tx++;
 340                 uart->port.x_char = 0;
 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
 354 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 355 {
 356         struct bfin_serial_port *uart = dev_id;
 357
 358         spin_lock(&uart->port.lock);
 359         while (UART_GET_LSR(uart) & DR)
 360                 bfin_serial_rx_chars(uart);
 361         spin_unlock(&uart->port.lock);
 362
 363         return IRQ_HANDLED;
 364 }
 365
 366 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 367 {
 368         struct bfin_serial_port *uart = dev_id;
 369
 370 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 371         if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
 372                 uart->scts = 0;
 373                 uart_handle_cts_change(&uart->port, uart->scts);
 374         }
 375 #endif
 376         spin_lock(&uart->port.lock);
 377         if (UART_GET_LSR(uart) & THRE)
 378                 bfin_serial_tx_chars(uart);
 379         spin_unlock(&uart->port.lock);
 380
 381         return IRQ_HANDLED;
 382 }
 383 #endif
 384
 385 #ifdef CONFIG_SERIAL_BFIN_DMA
 386 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 387 {
 388         struct circ_buf *xmit = &uart->port.info->xmit;
 389
 390         uart->tx_done = 0;
 391
 392         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 393                 uart->tx_count = 0;
 394                 uart->tx_done = 1;
 395                 return;
 396         }
 397
 398         if (uart->port.x_char) {
 399                 UART_PUT_CHAR(uart, uart->port.x_char);
 400                 uart->port.icount.tx++;
 401                 uart->port.x_char = 0;
 402         }
 403
 404         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 405         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 406                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 407         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 408                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 409         set_dma_config(uart->tx_dma_channel,
 410                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 411                         INTR_ON_BUF,
 412                         DIMENSION_LINEAR,
 413                         DATA_SIZE_8,
 414                         DMA_SYNC_RESTART));
 415         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 416         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 417         set_dma_x_modify(uart->tx_dma_channel, 1);
 418         enable_dma(uart->tx_dma_channel);
 419
 420         UART_SET_IER(uart, ETBEI);
 421 }
 422
 423 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 424 {
 425         struct tty_struct *tty = uart->port.info->port.tty;
 426         int i, flg, status;
 427
 428         status = UART_GET_LSR(uart);
 429         UART_CLEAR_LSR(uart);
 430
 431         uart->port.icount.rx +=
 432                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 433                 UART_XMIT_SIZE);
 434
 435         if (status & BI) {
 436                 uart->port.icount.brk++;
 437                 if (uart_handle_break(&uart->port))
 438                         goto dma_ignore_char;
 439                 status &= ~(PE | FE);
 440         }
 441         if (status & PE)
 442                 uart->port.icount.parity++;
 443         if (status & OE)
 444                 uart->port.icount.overrun++;
 445         if (status & FE)
 446                 uart->port.icount.frame++;
 447
 448         status &= uart->port.read_status_mask;
 449
 450         if (status & BI)
 451                 flg = TTY_BREAK;
 452         else if (status & PE)
 453                 flg = TTY_PARITY;
 454         else if (status & FE)
 455                 flg = TTY_FRAME;
 456         else
 457                 flg = TTY_NORMAL;
 458
 459         for (i = uart->rx_dma_buf.tail; ; i++) {
 460                 if (i >= UART_XMIT_SIZE)
 461                         i = 0;
 462                 if (i == uart->rx_dma_buf.head)
 463                         break;
 464                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 465                         uart_insert_char(&uart->port, status, OE,
 466                                 uart->rx_dma_buf.buf[i], flg);
 467         }
 468
 469  dma_ignore_char:
 470         tty_flip_buffer_push(tty);
 471 }
 472
 473 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 474 {
 475         int x_pos, pos;
 476         unsigned long flags;
 477
 478         spin_lock_irqsave(&uart->port.lock, flags);
 479
 480         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 481         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 482         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 483         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
 484                 uart->rx_dma_nrows = 0;
 485         x_pos = DMA_RX_XCOUNT - x_pos;
 486         if (x_pos == DMA_RX_XCOUNT)
 487                 x_pos = 0;
 488
 489         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 490         if (pos != uart->rx_dma_buf.tail) {
 491                 uart->rx_dma_buf.head = pos;
 492                 bfin_serial_dma_rx_chars(uart);
 493                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 494         }
 495
 496         spin_unlock_irqrestore(&uart->port.lock, flags);
 497
 498         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 499 }
 500
 501 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 502 {
 503         struct bfin_serial_port *uart = dev_id;
 504         struct circ_buf *xmit = &uart->port.info->xmit;
 505
 506 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 507         if (uart->scts && !(bfin_serial_get_mctrl(&uart->port)&TIOCM_CTS)) {
 508                 uart->scts = 0;
 509                 uart_handle_cts_change(&uart->port, uart->scts);
 510         }
 511 #endif
 512
 513         spin_lock(&uart->port.lock);
 514         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 515                 disable_dma(uart->tx_dma_channel);
 516                 clear_dma_irqstat(uart->tx_dma_channel);
 517                 UART_CLEAR_IER(uart, ETBEI);
 518                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 519                 uart->port.icount.tx += uart->tx_count;
 520
 521                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 522                         uart_write_wakeup(&uart->port);
 523
 524                 bfin_serial_dma_tx_chars(uart);
 525         }
 526
 527         spin_unlock(&uart->port.lock);
 528         return IRQ_HANDLED;
 529 }
 530
 531 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 532 {
 533         struct bfin_serial_port *uart = dev_id;
 534         unsigned short irqstat;
 535
 536         spin_lock(&uart->port.lock);
 537         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 538         clear_dma_irqstat(uart->rx_dma_channel);
 539         bfin_serial_dma_rx_chars(uart);
 540         spin_unlock(&uart->port.lock);
 541
 542         return IRQ_HANDLED;
 543 }
 544 #endif
 545
 546 /*
 547  * Return TIOCSER_TEMT when transmitter is not busy.
 548  */
 549 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 550 {
 551         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 552         unsigned short lsr;
 553
 554         lsr = UART_GET_LSR(uart);
 555         if (lsr & TEMT)
 556                 return TIOCSER_TEMT;
 557         else
 558                 return 0;
 559 }
 560
 561 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 562 {
 563         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 564         u16 lcr = UART_GET_LCR(uart);
 565         if (break_state)
 566                 lcr |= SB;
 567         else
 568                 lcr &= ~SB;
 569         UART_PUT_LCR(uart, lcr);
 570         SSYNC();
 571 }
 572
 573 static int bfin_serial_startup(struct uart_port *port)
 574 {
 575         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 576
 577 #ifdef CONFIG_SERIAL_BFIN_DMA
 578         dma_addr_t dma_handle;
 579
 580         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 581                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 582                 return -EBUSY;
 583         }
 584
 585         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 586                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 587                 free_dma(uart->rx_dma_channel);
 588                 return -EBUSY;
 589         }
 590
 591         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 592         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 593
 594         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 595         uart->rx_dma_buf.head = 0;
 596         uart->rx_dma_buf.tail = 0;
 597         uart->rx_dma_nrows = 0;
 598
 599         set_dma_config(uart->rx_dma_channel,
 600                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 601                                 INTR_ON_ROW, DIMENSION_2D,
 602                                 DATA_SIZE_8,
 603                                 DMA_SYNC_RESTART));
 604         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 605         set_dma_x_modify(uart->rx_dma_channel, 1);
 606         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 607         set_dma_y_modify(uart->rx_dma_channel, 1);
 608         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 609         enable_dma(uart->rx_dma_channel);
 610
 611         uart->rx_dma_timer.data = (unsigned long)(uart);
 612         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 613         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 614         add_timer(&(uart->rx_dma_timer));
 615 #else
 616 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 617         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 618         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 619                 kgdboc_break_enabled = 0;
 620         else {
 621 # endif
 622         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 623              "BFIN_UART_RX", uart)) {
 624                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 625                 return -EBUSY;
 626         }
 627
 628         if (request_irq
 629             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 630              "BFIN_UART_TX", uart)) {
 631                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 632                 free_irq(uart->port.irq, uart);
 633                 return -EBUSY;
 634         }
 635
 636 # ifdef CONFIG_BF54x
 637         {
 638                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 639
 640                 switch (uart->port.irq) {
 641                 case IRQ_UART3_RX:
 642                         uart_dma_ch_rx = CH_UART3_RX;
 643                         uart_dma_ch_tx = CH_UART3_TX;
 644                         break;
 645                 case IRQ_UART2_RX:
 646                         uart_dma_ch_rx = CH_UART2_RX;
 647                         uart_dma_ch_tx = CH_UART2_TX;
 648                         break;
 649                 default:
 650                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
 651                         break;
 652                 };
 653
 654                 if (uart_dma_ch_rx &&
 655                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 656                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
 657                         free_irq(uart->port.irq, uart);
 658                         free_irq(uart->port.irq + 1, uart);
 659                         return -EBUSY;
 660                 }
 661                 if (uart_dma_ch_tx &&
 662                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 663                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 664                         free_dma(uart_dma_ch_rx);
 665                         free_irq(uart->port.irq, uart);
 666                         free_irq(uart->port.irq + 1, uart);
 667                         return -EBUSY;
 668                 }
 669         }
 670 # endif
 671 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 672         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 673         }
 674 # endif
 675 #endif
 676
 677 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 678         if (uart->cts_pin >= 0) {
 679                 if (request_irq(gpio_to_irq(uart->cts_pin),
 680                         bfin_serial_mctrl_cts_int,
 681                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 682                         IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
 683                         uart->cts_pin = -1;
 684                         pr_info("Unable to attach BlackFin UART CTS interrupt.\
 685                                  So, disable it.\n");
 686                 }
 687         }
 688         if (uart->rts_pin >= 0) {
 689                 gpio_request(uart->rts_pin, DRIVER_NAME);
 690                 gpio_direction_output(uart->rts_pin, 0);
 691         }
 692 #endif
 693 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 694         if (request_irq(uart->status_irq,
 695                 bfin_serial_mctrl_cts_int,
 696                 IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
 697                 pr_info("Unable to attach BlackFin UART Modem \
 698                         Status interrupt.\n");
 699         }
 700
 701         if (uart->cts_pin >= 0) {
 702                 gpio_request(uart->cts_pin, DRIVER_NAME);
 703                 gpio_direction_output(uart->cts_pin, 1);
 704         }
 705         if (uart->rts_pin >= 0) {
 706                 gpio_request(uart->rts_pin, DRIVER_NAME);
 707                 gpio_direction_output(uart->rts_pin, 0);
 708         }
 709
 710         /* CTS RTS PINs are negative assertive. */
 711         UART_PUT_MCR(uart, ACTS);
 712         UART_SET_IER(uart, EDSSI);
 713 #endif
 714
 715         UART_SET_IER(uart, ERBFI);
 716         return 0;
 717 }
 718
 719 static void bfin_serial_shutdown(struct uart_port *port)
 720 {
 721         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 722
 723 #ifdef CONFIG_SERIAL_BFIN_DMA
 724         disable_dma(uart->tx_dma_channel);
 725         free_dma(uart->tx_dma_channel);
 726         disable_dma(uart->rx_dma_channel);
 727         free_dma(uart->rx_dma_channel);
 728         del_timer(&(uart->rx_dma_timer));
 729         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 730 #else
 731 #ifdef CONFIG_BF54x
 732         switch (uart->port.irq) {
 733         case IRQ_UART3_RX:
 734                 free_dma(CH_UART3_RX);
 735                 free_dma(CH_UART3_TX);
 736                 break;
 737         case IRQ_UART2_RX:
 738                 free_dma(CH_UART2_RX);
 739                 free_dma(CH_UART2_TX);
 740                 break;
 741         default:
 742                 break;
 743         };
 744 #endif
 745         free_irq(uart->port.irq, uart);
 746         free_irq(uart->port.irq+1, uart);
 747 #endif
 748
 749 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 750         if (uart->cts_pin >= 0)
 751                 free_irq(gpio_to_irq(uart->cts_pin), uart);
 752         if (uart->rts_pin >= 0)
 753                 gpio_free(uart->rts_pin);
 754 #endif
 755 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 756         if (uart->cts_pin >= 0)
 757                 gpio_free(uart->cts_pin);
 758         if (uart->rts_pin >= 0)
 759                 gpio_free(uart->rts_pin);
 760         if (UART_GET_IER(uart) && EDSSI)
 761                 free_irq(uart->status_irq, uart);
 762 #endif
 763 }
 764
 765 static void
 766 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 767                    struct ktermios *old)
 768 {
 769         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 770         unsigned long flags;
 771         unsigned int baud, quot;
 772         unsigned short val, ier, lcr = 0;
 773
 774         switch (termios->c_cflag & CSIZE) {
 775         case CS8:
 776                 lcr = WLS(8);
 777                 break;
 778         case CS7:
 779                 lcr = WLS(7);
 780                 break;
 781         case CS6:
 782                 lcr = WLS(6);
 783                 break;
 784         case CS5:
 785                 lcr = WLS(5);
 786                 break;
 787         default:
 788                 printk(KERN_ERR "%s: word lengh not supported\n",
 789                         __func__);
 790         }
 791
 792         if (termios->c_cflag & CSTOPB)
 793                 lcr |= STB;
 794         if (termios->c_cflag & PARENB)
 795                 lcr |= PEN;
 796         if (!(termios->c_cflag & PARODD))
 797                 lcr |= EPS;
 798         if (termios->c_cflag & CMSPAR)
 799                 lcr |= STP;
 800
 801         port->read_status_mask = OE;
 802         if (termios->c_iflag & INPCK)
 803                 port->read_status_mask |= (FE | PE);
 804         if (termios->c_iflag & (BRKINT | PARMRK))
 805                 port->read_status_mask |= BI;
 806
 807         /*
 808          * Characters to ignore
 809          */
 810         port->ignore_status_mask = 0;
 811         if (termios->c_iflag & IGNPAR)
 812                 port->ignore_status_mask |= FE | PE;
 813         if (termios->c_iflag & IGNBRK) {
 814                 port->ignore_status_mask |= BI;
 815                 /*
 816                  * If we're ignoring parity and break indicators,
 817                  * ignore overruns too (for real raw support).
 818                  */
 819                 if (termios->c_iflag & IGNPAR)
 820                         port->ignore_status_mask |= OE;
 821         }
 822
 823         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 824         quot = uart_get_divisor(port, baud) - ANOMALY_05000230;
 825         spin_lock_irqsave(&uart->port.lock, flags);
 826
 827         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 828
 829         /* Disable UART */
 830         ier = UART_GET_IER(uart);
 831         UART_DISABLE_INTS(uart);
 832
 833         /* Set DLAB in LCR to Access DLL and DLH */
 834         UART_SET_DLAB(uart);
 835
 836         UART_PUT_DLL(uart, quot & 0xFF);
 837         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 838         SSYNC();
 839
 840         /* Clear DLAB in LCR to Access THR RBR IER */
 841         UART_CLEAR_DLAB(uart);
 842
 843         UART_PUT_LCR(uart, lcr);
 844
 845         /* Enable UART */
 846         UART_ENABLE_INTS(uart, ier);
 847
 848         val = UART_GET_GCTL(uart);
 849         val |= UCEN;
 850         UART_PUT_GCTL(uart, val);
 851
 852         /* Port speed changed, update the per-port timeout. */
 853         uart_update_timeout(port, termios->c_cflag, baud);
 854
 855         spin_unlock_irqrestore(&uart->port.lock, flags);
 856 }
 857
 858 static const char *bfin_serial_type(struct uart_port *port)
 859 {
 860         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 861
 862         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 863 }
 864
 865 /*
 866  * Release the memory region(s) being used by 'port'.
 867  */
 868 static void bfin_serial_release_port(struct uart_port *port)
 869 {
 870 }
 871
 872 /*
 873  * Request the memory region(s) being used by 'port'.
 874  */
 875 static int bfin_serial_request_port(struct uart_port *port)
 876 {
 877         return 0;
 878 }
 879
 880 /*
 881  * Configure/autoconfigure the port.
 882  */
 883 static void bfin_serial_config_port(struct uart_port *port, int flags)
 884 {
 885         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 886
 887         if (flags & UART_CONFIG_TYPE &&
 888             bfin_serial_request_port(&uart->port) == 0)
 889                 uart->port.type = PORT_BFIN;
 890 }
 891
 892 /*
 893  * Verify the new serial_struct (for TIOCSSERIAL).
 894  * The only change we allow are to the flags and type, and
 895  * even then only between PORT_BFIN and PORT_UNKNOWN
 896  */
 897 static int
 898 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 899 {
 900         return 0;
 901 }
 902
 903 /*
 904  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 905  * In other cases, disable IrDA function.
 906  */
 907 static void bfin_serial_set_ldisc(struct uart_port *port)
 908 {
 909         int line = port->line;
 910         unsigned short val;
 911
 912         if (line >= port->info->port.tty->driver->num)
 913                 return;
 914
 915         switch (port->info->port.tty->termios->c_line) {
 916         case N_IRDA:
 917                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 918                 val |= (IREN | RPOLC);
 919                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 920                 break;
 921         default:
 922                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 923                 val &= ~(IREN | RPOLC);
 924                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 925         }
 926 }
 927
 928 static void bfin_serial_reset_irda(struct uart_port *port)
 929 {
 930         int line = port->line;
 931         unsigned short val;
 932
 933         val = UART_GET_GCTL(&bfin_serial_ports[line]);
 934         val &= ~(IREN | RPOLC);
 935         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 936         SSYNC();
 937         val |= (IREN | RPOLC);
 938         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 939         SSYNC();
 940 }
 941
 942 #ifdef CONFIG_CONSOLE_POLL
 943 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
 944 {
 945         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 946
 947         while (!(UART_GET_LSR(uart) & THRE))
 948                 cpu_relax();
 949
 950         UART_CLEAR_DLAB(uart);
 951         UART_PUT_CHAR(uart, (unsigned char)chr);
 952 }
 953
 954 static int bfin_serial_poll_get_char(struct uart_port *port)
 955 {
 956         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 957         unsigned char chr;
 958
 959         while (!(UART_GET_LSR(uart) & DR))
 960                 cpu_relax();
 961
 962         UART_CLEAR_DLAB(uart);
 963         chr = UART_GET_CHAR(uart);
 964
 965         return chr;
 966 }
 967 #endif
 968
 969 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 970         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 971 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
 972 {
 973         if (kgdboc_break_enabled) {
 974                 kgdboc_break_enabled = 0;
 975                 bfin_serial_shutdown(port);
 976         }
 977 }
 978
 979 static int bfin_kgdboc_port_startup(struct uart_port *port)
 980 {
 981         kgdboc_port_line = port->line;
 982         kgdboc_break_enabled = !bfin_serial_startup(port);
 983         return 0;
 984 }
 985 #endif
 986
 987 static struct uart_ops bfin_serial_pops = {
 988         .tx_empty       = bfin_serial_tx_empty,
 989         .set_mctrl      = bfin_serial_set_mctrl,
 990         .get_mctrl      = bfin_serial_get_mctrl,
 991         .stop_tx        = bfin_serial_stop_tx,
 992         .start_tx       = bfin_serial_start_tx,
 993         .stop_rx        = bfin_serial_stop_rx,
 994         .enable_ms      = bfin_serial_enable_ms,
 995         .break_ctl      = bfin_serial_break_ctl,
 996         .startup        = bfin_serial_startup,
 997         .shutdown       = bfin_serial_shutdown,
 998         .set_termios    = bfin_serial_set_termios,
 999         .set_ldisc      = bfin_serial_set_ldisc,
1000         .type           = bfin_serial_type,
1001         .release_port   = bfin_serial_release_port,
1002         .request_port   = bfin_serial_request_port,
1003         .config_port    = bfin_serial_config_port,
1004         .verify_port    = bfin_serial_verify_port,
1005 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1006         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1007         .kgdboc_port_startup    = bfin_kgdboc_port_startup,
1008         .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
1009 #endif
1010 #ifdef CONFIG_CONSOLE_POLL
1011         .poll_put_char  = bfin_serial_poll_put_char,
1012         .poll_get_char  = bfin_serial_poll_get_char,
1013 #endif
1014 };
1015
1016 static void __init bfin_serial_hw_init(void)
1017 {
1018 #ifdef CONFIG_SERIAL_BFIN_UART0
1019         peripheral_request(P_UART0_TX, DRIVER_NAME);
1020         peripheral_request(P_UART0_RX, DRIVER_NAME);
1021 #endif
1022
1023 #ifdef CONFIG_SERIAL_BFIN_UART1
1024         peripheral_request(P_UART1_TX, DRIVER_NAME);
1025         peripheral_request(P_UART1_RX, DRIVER_NAME);
1026
1027 # if defined(CONFIG_BFIN_UART1_CTSRTS) && defined(CONFIG_BF54x)
1028         peripheral_request(P_UART1_RTS, DRIVER_NAME);
1029         peripheral_request(P_UART1_CTS, DRIVER_NAME);
1030 # endif
1031 #endif
1032
1033 #ifdef CONFIG_SERIAL_BFIN_UART2
1034         peripheral_request(P_UART2_TX, DRIVER_NAME);
1035         peripheral_request(P_UART2_RX, DRIVER_NAME);
1036 #endif
1037
1038 #ifdef CONFIG_SERIAL_BFIN_UART3
1039         peripheral_request(P_UART3_TX, DRIVER_NAME);
1040         peripheral_request(P_UART3_RX, DRIVER_NAME);
1041
1042 # if defined(CONFIG_BFIN_UART3_CTSRTS) && defined(CONFIG_BF54x)
1043         peripheral_request(P_UART3_RTS, DRIVER_NAME);
1044         peripheral_request(P_UART3_CTS, DRIVER_NAME);
1045 # endif
1046 #endif
1047 }
1048
1049 static void __init bfin_serial_init_ports(void)
1050 {
1051         static int first = 1;
1052         int i;
1053
1054         if (!first)
1055                 return;
1056         first = 0;
1057
1058         bfin_serial_hw_init();
1059
1060         for (i = 0; i < nr_active_ports; i++) {
1061                 bfin_serial_ports[i].port.uartclk   = get_sclk();
1062                 bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1063                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
1064                 bfin_serial_ports[i].port.line      = i;
1065                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
1066                 bfin_serial_ports[i].port.membase   =
1067                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
1068                 bfin_serial_ports[i].port.mapbase   =
1069                         bfin_serial_resource[i].uart_base_addr;
1070                 bfin_serial_ports[i].port.irq       =
1071                         bfin_serial_resource[i].uart_irq;
1072                 bfin_serial_ports[i].status_irq     =
1073                         bfin_serial_resource[i].uart_status_irq;
1074                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
1075 #ifdef CONFIG_SERIAL_BFIN_DMA
1076                 bfin_serial_ports[i].tx_done        = 1;
1077                 bfin_serial_ports[i].tx_count       = 0;
1078                 bfin_serial_ports[i].tx_dma_channel =
1079                         bfin_serial_resource[i].uart_tx_dma_channel;
1080                 bfin_serial_ports[i].rx_dma_channel =
1081                         bfin_serial_resource[i].uart_rx_dma_channel;
1082                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
1083 #endif
1084 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1085         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1086                 bfin_serial_ports[i].cts_pin        =
1087                         bfin_serial_resource[i].uart_cts_pin;
1088                 bfin_serial_ports[i].rts_pin        =
1089                         bfin_serial_resource[i].uart_rts_pin;
1090 #endif
1091         }
1092 }
1093
1094 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1095 /*
1096  * If the port was already initialised (eg, by a boot loader),
1097  * try to determine the current setup.
1098  */
1099 static void __init
1100 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1101                            int *parity, int *bits)
1102 {
1103         unsigned short status;
1104
1105         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1106         if (status == (ERBFI | ETBEI)) {
1107                 /* ok, the port was enabled */
1108                 u16 lcr, dlh, dll;
1109
1110                 lcr = UART_GET_LCR(uart);
1111
1112                 *parity = 'n';
1113                 if (lcr & PEN) {
1114                         if (lcr & EPS)
1115                                 *parity = 'e';
1116                         else
1117                                 *parity = 'o';
1118                 }
1119                 switch (lcr & 0x03) {
1120                         case 0: *bits = 5; break;
1121                         case 1: *bits = 6; break;
1122                         case 2: *bits = 7; break;
1123                         case 3: *bits = 8; break;
1124                 }
1125                 /* Set DLAB in LCR to Access DLL and DLH */
1126                 UART_SET_DLAB(uart);
1127
1128                 dll = UART_GET_DLL(uart);
1129                 dlh = UART_GET_DLH(uart);
1130
1131                 /* Clear DLAB in LCR to Access THR RBR IER */
1132                 UART_CLEAR_DLAB(uart);
1133
1134                 *baud = get_sclk() / (16*(dll | dlh << 8));
1135         }
1136         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1137 }
1138
1139 static struct uart_driver bfin_serial_reg;
1140
1141 static int __init
1142 bfin_serial_console_setup(struct console *co, char *options)
1143 {
1144         struct bfin_serial_port *uart;
1145         int baud = 57600;
1146         int bits = 8;
1147         int parity = 'n';
1148 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1149         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1150         int flow = 'r';
1151 # else
1152         int flow = 'n';
1153 # endif
1154
1155         /*
1156          * Check whether an invalid uart number has been specified, and
1157          * if so, search for the first available port that does have
1158          * console support.
1159          */
1160         if (co->index == -1 || co->index >= nr_active_ports)
1161                 co->index = 0;
1162         uart = &bfin_serial_ports[co->index];
1163
1164         if (options)
1165                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1166         else
1167                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1168
1169         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1170 }
1171 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1172                                  defined (CONFIG_EARLY_PRINTK) */
1173
1174 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1175 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1176 {
1177         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1178         while (!(UART_GET_LSR(uart) & THRE))
1179                 barrier();
1180         UART_PUT_CHAR(uart, ch);
1181         SSYNC();
1182 }
1183
1184 /*
1185  * Interrupts are disabled on entering
1186  */
1187 static void
1188 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1189 {
1190         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1191         unsigned long flags;
1192
1193         spin_lock_irqsave(&uart->port.lock, flags);
1194         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1195         spin_unlock_irqrestore(&uart->port.lock, flags);
1196
1197 }
1198
1199 static struct console bfin_serial_console = {
1200         .name           = BFIN_SERIAL_NAME,
1201         .write          = bfin_serial_console_write,
1202         .device         = uart_console_device,
1203         .setup          = bfin_serial_console_setup,
1204         .flags          = CON_PRINTBUFFER,
1205         .index          = -1,
1206         .data           = &bfin_serial_reg,
1207 };
1208
1209 static int __init bfin_serial_rs_console_init(void)
1210 {
1211         bfin_serial_init_ports();
1212         register_console(&bfin_serial_console);
1213
1214         return 0;
1215 }
1216 console_initcall(bfin_serial_rs_console_init);
1217
1218 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1219 #else
1220 #define BFIN_SERIAL_CONSOLE     NULL
1221 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1222
1223
1224 #ifdef CONFIG_EARLY_PRINTK
1225 static __init void early_serial_putc(struct uart_port *port, int ch)
1226 {
1227         unsigned timeout = 0xffff;
1228         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1229
1230         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1231                 cpu_relax();
1232         UART_PUT_CHAR(uart, ch);
1233 }
1234
1235 static __init void early_serial_write(struct console *con, const char *s,
1236                                         unsigned int n)
1237 {
1238         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1239         unsigned int i;
1240
1241         for (i = 0; i < n; i++, s++) {
1242                 if (*s == '\n')
1243                         early_serial_putc(&uart->port, '\r');
1244                 early_serial_putc(&uart->port, *s);
1245         }
1246 }
1247
1248 static struct __initdata console bfin_early_serial_console = {
1249         .name = "early_BFuart",
1250         .write = early_serial_write,
1251         .device = uart_console_device,
1252         .flags = CON_PRINTBUFFER,
1253         .setup = bfin_serial_console_setup,
1254         .index = -1,
1255         .data  = &bfin_serial_reg,
1256 };
1257
1258 struct console __init *bfin_earlyserial_init(unsigned int port,
1259                                                 unsigned int cflag)
1260 {
1261         struct bfin_serial_port *uart;
1262         struct ktermios t;
1263
1264         if (port == -1 || port >= nr_active_ports)
1265                 port = 0;
1266         bfin_serial_init_ports();
1267         bfin_early_serial_console.index = port;
1268         uart = &bfin_serial_ports[port];
1269         t.c_cflag = cflag;
1270         t.c_iflag = 0;
1271         t.c_oflag = 0;
1272         t.c_lflag = ICANON;
1273         t.c_line = port;
1274         bfin_serial_set_termios(&uart->port, &t, &t);
1275         return &bfin_early_serial_console;
1276 }
1277
1278 #endif /* CONFIG_EARLY_PRINTK */
1279
1280 static struct uart_driver bfin_serial_reg = {
1281         .owner                  = THIS_MODULE,
1282         .driver_name            = "bfin-uart",
1283         .dev_name               = BFIN_SERIAL_NAME,
1284         .major                  = BFIN_SERIAL_MAJOR,
1285         .minor                  = BFIN_SERIAL_MINOR,
1286         .nr                     = BFIN_UART_NR_PORTS,
1287         .cons                   = BFIN_SERIAL_CONSOLE,
1288 };
1289
1290 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1291 {
1292         int i;
1293
1294         for (i = 0; i < nr_active_ports; i++) {
1295                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1296                         continue;
1297                 uart_suspend_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1298         }
1299
1300         return 0;
1301 }
1302
1303 static int bfin_serial_resume(struct platform_device *dev)
1304 {
1305         int i;
1306
1307         for (i = 0; i < nr_active_ports; i++) {
1308                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1309                         continue;
1310                 uart_resume_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1311         }
1312
1313         return 0;
1314 }
1315
1316 static int bfin_serial_probe(struct platform_device *dev)
1317 {
1318         struct resource *res = dev->resource;
1319         int i;
1320
1321         for (i = 0; i < dev->num_resources; i++, res++)
1322                 if (res->flags & IORESOURCE_MEM)
1323                         break;
1324
1325         if (i < dev->num_resources) {
1326                 for (i = 0; i < nr_active_ports; i++, res++) {
1327                         if (bfin_serial_ports[i].port.mapbase != res->start)
1328                                 continue;
1329                         bfin_serial_ports[i].port.dev = &dev->dev;
1330                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1331                 }
1332         }
1333
1334         return 0;
1335 }
1336
1337 static int bfin_serial_remove(struct platform_device *dev)
1338 {
1339         int i;
1340
1341         for (i = 0; i < nr_active_ports; i++) {
1342                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1343                         continue;
1344                 uart_remove_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1345                 bfin_serial_ports[i].port.dev = NULL;
1346 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1347         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1348                 gpio_free(bfin_serial_ports[i].cts_pin);
1349                 gpio_free(bfin_serial_ports[i].rts_pin);
1350 #endif
1351         }
1352
1353         return 0;
1354 }
1355
1356 static struct platform_driver bfin_serial_driver = {
1357         .probe          = bfin_serial_probe,
1358         .remove         = bfin_serial_remove,
1359         .suspend        = bfin_serial_suspend,
1360         .resume         = bfin_serial_resume,
1361         .driver         = {
1362                 .name   = "bfin-uart",
1363                 .owner  = THIS_MODULE,
1364         },
1365 };
1366
1367 static int __init bfin_serial_init(void)
1368 {
1369         int ret;
1370
1371         pr_info("Serial: Blackfin serial driver\n");
1372
1373         bfin_serial_init_ports();
1374
1375         ret = uart_register_driver(&bfin_serial_reg);
1376         if (ret == 0) {
1377                 ret = platform_driver_register(&bfin_serial_driver);
1378                 if (ret) {
1379                         pr_debug("uart register failed\n");
1380                         uart_unregister_driver(&bfin_serial_reg);
1381                 }
1382         }
1383         return ret;
1384 }
1385
1386 static void __exit bfin_serial_exit(void)
1387 {
1388         platform_driver_unregister(&bfin_serial_driver);
1389         uart_unregister_driver(&bfin_serial_reg);
1390 }
1391
1392
1393 module_init(bfin_serial_init);
1394 module_exit(bfin_serial_exit);
1395
1396 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1397 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1398 MODULE_LICENSE("GPL");
1399 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1400 MODULE_ALIAS("platform:bfin-uart");