SAFE public projects git trees. - safe/jmp/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         SSYNC();
 419         enable_dma(uart->tx_dma_channel);
 420
 421         UART_SET_IER(uart, ETBEI);
 422 }
 423
 424 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 425 {
 426         struct tty_struct *tty = uart->port.info->port.tty;
 427         int i, flg, status;
 428
 429         status = UART_GET_LSR(uart);
 430         UART_CLEAR_LSR(uart);
 431
 432         uart->port.icount.rx +=
 433                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 434                 UART_XMIT_SIZE);
 435
 436         if (status & BI) {
 437                 uart->port.icount.brk++;
 438                 if (uart_handle_break(&uart->port))
 439                         goto dma_ignore_char;
 440                 status &= ~(PE | FE);
 441         }
 442         if (status & PE)
 443                 uart->port.icount.parity++;
 444         if (status & OE)
 445                 uart->port.icount.overrun++;
 446         if (status & FE)
 447                 uart->port.icount.frame++;
 448
 449         status &= uart->port.read_status_mask;
 450
 451         if (status & BI)
 452                 flg = TTY_BREAK;
 453         else if (status & PE)
 454                 flg = TTY_PARITY;
 455         else if (status & FE)
 456                 flg = TTY_FRAME;
 457         else
 458                 flg = TTY_NORMAL;
 459
 460         for (i = uart->rx_dma_buf.tail; ; i++) {
 461                 if (i >= UART_XMIT_SIZE)
 462                         i = 0;
 463                 if (i == uart->rx_dma_buf.head)
 464                         break;
 465                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 466                         uart_insert_char(&uart->port, status, OE,
 467                                 uart->rx_dma_buf.buf[i], flg);
 468         }
 469
 470  dma_ignore_char:
 471         tty_flip_buffer_push(tty);
 472 }
 473
 474 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 475 {
 476         int x_pos, pos;
 477         unsigned long flags;
 478
 479         spin_lock_irqsave(&uart->port.lock, flags);
 480
 481         /* 2D DMA RX buffer ring is used. Because curr_y_count and
 482          * curr_x_count can't be read as an atomic operation,
 483          * curr_y_count should be read before curr_x_count. When
 484          * curr_x_count is read, curr_y_count may already indicate
 485          * next buffer line. But, the position calculated here is
 486          * still indicate the old line. The wrong position data may
 487          * be smaller than current buffer tail, which cause garbages
 488          * are received if it is not prohibit.
 489          */
 490         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 491         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 492         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 493         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
 494                 uart->rx_dma_nrows = 0;
 495         x_pos = DMA_RX_XCOUNT - x_pos;
 496         if (x_pos == DMA_RX_XCOUNT)
 497                 x_pos = 0;
 498
 499         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 500         /* Ignore receiving data if new position is in the same line of
 501          * current buffer tail and small.
 502          */
 503         if (pos > uart->rx_dma_buf.tail ||
 504                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
 505                 uart->rx_dma_buf.head = pos;
 506                 bfin_serial_dma_rx_chars(uart);
 507                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 508         }
 509
 510         spin_unlock_irqrestore(&uart->port.lock, flags);
 511
 512         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 513 }
 514
 515 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 516 {
 517         struct bfin_serial_port *uart = dev_id;
 518         struct circ_buf *xmit = &uart->port.info->xmit;
 519
 520 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 521         if (uart->scts && !(bfin_serial_get_mctrl(&uart->port)&TIOCM_CTS)) {
 522                 uart->scts = 0;
 523                 uart_handle_cts_change(&uart->port, uart->scts);
 524         }
 525 #endif
 526
 527         spin_lock(&uart->port.lock);
 528         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 529                 disable_dma(uart->tx_dma_channel);
 530                 clear_dma_irqstat(uart->tx_dma_channel);
 531                 UART_CLEAR_IER(uart, ETBEI);
 532                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 533                 uart->port.icount.tx += uart->tx_count;
 534
 535                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 536                         uart_write_wakeup(&uart->port);
 537
 538                 bfin_serial_dma_tx_chars(uart);
 539         }
 540
 541         spin_unlock(&uart->port.lock);
 542         return IRQ_HANDLED;
 543 }
 544
 545 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 546 {
 547         struct bfin_serial_port *uart = dev_id;
 548         unsigned short irqstat;
 549         int x_pos, pos;
 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
 555         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 556         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 557         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 558         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
 559                 uart->rx_dma_nrows = 0;
 560
 561         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
 562         if (pos > uart->rx_dma_buf.tail ||
 563                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
 564                 uart->rx_dma_buf.head = pos;
 565                 bfin_serial_dma_rx_chars(uart);
 566                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 567         }
 568
 569         spin_unlock(&uart->port.lock);
 570
 571         return IRQ_HANDLED;
 572 }
 573 #endif
 574
 575 /*
 576  * Return TIOCSER_TEMT when transmitter is not busy.
 577  */
 578 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 579 {
 580         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 581         unsigned short lsr;
 582
 583         lsr = UART_GET_LSR(uart);
 584         if (lsr & TEMT)
 585                 return TIOCSER_TEMT;
 586         else
 587                 return 0;
 588 }
 589
 590 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 591 {
 592         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 593         u16 lcr = UART_GET_LCR(uart);
 594         if (break_state)
 595                 lcr |= SB;
 596         else
 597                 lcr &= ~SB;
 598         UART_PUT_LCR(uart, lcr);
 599         SSYNC();
 600 }
 601
 602 static int bfin_serial_startup(struct uart_port *port)
 603 {
 604         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 605
 606 #ifdef CONFIG_SERIAL_BFIN_DMA
 607         dma_addr_t dma_handle;
 608
 609         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 610                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 611                 return -EBUSY;
 612         }
 613
 614         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 615                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 616                 free_dma(uart->rx_dma_channel);
 617                 return -EBUSY;
 618         }
 619
 620         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 621         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 622
 623         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 624         uart->rx_dma_buf.head = 0;
 625         uart->rx_dma_buf.tail = 0;
 626         uart->rx_dma_nrows = 0;
 627
 628         set_dma_config(uart->rx_dma_channel,
 629                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 630                                 INTR_ON_ROW, DIMENSION_2D,
 631                                 DATA_SIZE_8,
 632                                 DMA_SYNC_RESTART));
 633         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 634         set_dma_x_modify(uart->rx_dma_channel, 1);
 635         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 636         set_dma_y_modify(uart->rx_dma_channel, 1);
 637         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 638         enable_dma(uart->rx_dma_channel);
 639
 640         uart->rx_dma_timer.data = (unsigned long)(uart);
 641         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 642         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 643         add_timer(&(uart->rx_dma_timer));
 644 #else
 645 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 646         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 647         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 648                 kgdboc_break_enabled = 0;
 649         else {
 650 # endif
 651         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 652              "BFIN_UART_RX", uart)) {
 653                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 654                 return -EBUSY;
 655         }
 656
 657         if (request_irq
 658             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 659              "BFIN_UART_TX", uart)) {
 660                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 661                 free_irq(uart->port.irq, uart);
 662                 return -EBUSY;
 663         }
 664
 665 # ifdef CONFIG_BF54x
 666         {
 667                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 668
 669                 switch (uart->port.irq) {
 670                 case IRQ_UART3_RX:
 671                         uart_dma_ch_rx = CH_UART3_RX;
 672                         uart_dma_ch_tx = CH_UART3_TX;
 673                         break;
 674                 case IRQ_UART2_RX:
 675                         uart_dma_ch_rx = CH_UART2_RX;
 676                         uart_dma_ch_tx = CH_UART2_TX;
 677                         break;
 678                 default:
 679                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
 680                         break;
 681                 };
 682
 683                 if (uart_dma_ch_rx &&
 684                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 685                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
 686                         free_irq(uart->port.irq, uart);
 687                         free_irq(uart->port.irq + 1, uart);
 688                         return -EBUSY;
 689                 }
 690                 if (uart_dma_ch_tx &&
 691                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 692                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 693                         free_dma(uart_dma_ch_rx);
 694                         free_irq(uart->port.irq, uart);
 695                         free_irq(uart->port.irq + 1, uart);
 696                         return -EBUSY;
 697                 }
 698         }
 699 # endif
 700 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 701         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 702         }
 703 # endif
 704 #endif
 705
 706 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 707         if (uart->cts_pin >= 0) {
 708                 if (request_irq(gpio_to_irq(uart->cts_pin),
 709                         bfin_serial_mctrl_cts_int,
 710                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 711                         IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
 712                         uart->cts_pin = -1;
 713                         pr_info("Unable to attach BlackFin UART CTS interrupt.\
 714                                  So, disable it.\n");
 715                 }
 716         }
 717         if (uart->rts_pin >= 0) {
 718                 gpio_request(uart->rts_pin, DRIVER_NAME);
 719                 gpio_direction_output(uart->rts_pin, 0);
 720         }
 721 #endif
 722 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 723         if (request_irq(uart->status_irq,
 724                 bfin_serial_mctrl_cts_int,
 725                 IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
 726                 pr_info("Unable to attach BlackFin UART Modem \
 727                         Status interrupt.\n");
 728         }
 729
 730         if (uart->cts_pin >= 0) {
 731                 gpio_request(uart->cts_pin, DRIVER_NAME);
 732                 gpio_direction_output(uart->cts_pin, 1);
 733         }
 734         if (uart->rts_pin >= 0) {
 735                 gpio_request(uart->rts_pin, DRIVER_NAME);
 736                 gpio_direction_output(uart->rts_pin, 0);
 737         }
 738
 739         /* CTS RTS PINs are negative assertive. */
 740         UART_PUT_MCR(uart, ACTS);
 741         UART_SET_IER(uart, EDSSI);
 742 #endif
 743
 744         UART_SET_IER(uart, ERBFI);
 745         return 0;
 746 }
 747
 748 static void bfin_serial_shutdown(struct uart_port *port)
 749 {
 750         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 751
 752 #ifdef CONFIG_SERIAL_BFIN_DMA
 753         disable_dma(uart->tx_dma_channel);
 754         free_dma(uart->tx_dma_channel);
 755         disable_dma(uart->rx_dma_channel);
 756         free_dma(uart->rx_dma_channel);
 757         del_timer(&(uart->rx_dma_timer));
 758         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 759 #else
 760 #ifdef CONFIG_BF54x
 761         switch (uart->port.irq) {
 762         case IRQ_UART3_RX:
 763                 free_dma(CH_UART3_RX);
 764                 free_dma(CH_UART3_TX);
 765                 break;
 766         case IRQ_UART2_RX:
 767                 free_dma(CH_UART2_RX);
 768                 free_dma(CH_UART2_TX);
 769                 break;
 770         default:
 771                 break;
 772         };
 773 #endif
 774         free_irq(uart->port.irq, uart);
 775         free_irq(uart->port.irq+1, uart);
 776 #endif
 777
 778 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 779         if (uart->cts_pin >= 0)
 780                 free_irq(gpio_to_irq(uart->cts_pin), uart);
 781         if (uart->rts_pin >= 0)
 782                 gpio_free(uart->rts_pin);
 783 #endif
 784 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 785         if (uart->cts_pin >= 0)
 786                 gpio_free(uart->cts_pin);
 787         if (uart->rts_pin >= 0)
 788                 gpio_free(uart->rts_pin);
 789         if (UART_GET_IER(uart) && EDSSI)
 790                 free_irq(uart->status_irq, uart);
 791 #endif
 792 }
 793
 794 static void
 795 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 796                    struct ktermios *old)
 797 {
 798         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 799         unsigned long flags;
 800         unsigned int baud, quot;
 801         unsigned short val, ier, lcr = 0;
 802
 803         switch (termios->c_cflag & CSIZE) {
 804         case CS8:
 805                 lcr = WLS(8);
 806                 break;
 807         case CS7:
 808                 lcr = WLS(7);
 809                 break;
 810         case CS6:
 811                 lcr = WLS(6);
 812                 break;
 813         case CS5:
 814                 lcr = WLS(5);
 815                 break;
 816         default:
 817                 printk(KERN_ERR "%s: word lengh not supported\n",
 818                         __func__);
 819         }
 820
 821         if (termios->c_cflag & CSTOPB)
 822                 lcr |= STB;
 823         if (termios->c_cflag & PARENB)
 824                 lcr |= PEN;
 825         if (!(termios->c_cflag & PARODD))
 826                 lcr |= EPS;
 827         if (termios->c_cflag & CMSPAR)
 828                 lcr |= STP;
 829
 830         port->read_status_mask = OE;
 831         if (termios->c_iflag & INPCK)
 832                 port->read_status_mask |= (FE | PE);
 833         if (termios->c_iflag & (BRKINT | PARMRK))
 834                 port->read_status_mask |= BI;
 835
 836         /*
 837          * Characters to ignore
 838          */
 839         port->ignore_status_mask = 0;
 840         if (termios->c_iflag & IGNPAR)
 841                 port->ignore_status_mask |= FE | PE;
 842         if (termios->c_iflag & IGNBRK) {
 843                 port->ignore_status_mask |= BI;
 844                 /*
 845                  * If we're ignoring parity and break indicators,
 846                  * ignore overruns too (for real raw support).
 847                  */
 848                 if (termios->c_iflag & IGNPAR)
 849                         port->ignore_status_mask |= OE;
 850         }
 851
 852         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 853         quot = uart_get_divisor(port, baud) - ANOMALY_05000230;
 854         spin_lock_irqsave(&uart->port.lock, flags);
 855
 856         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 857
 858         /* Disable UART */
 859         ier = UART_GET_IER(uart);
 860         UART_DISABLE_INTS(uart);
 861
 862         /* Set DLAB in LCR to Access DLL and DLH */
 863         UART_SET_DLAB(uart);
 864
 865         UART_PUT_DLL(uart, quot & 0xFF);
 866         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 867         SSYNC();
 868
 869         /* Clear DLAB in LCR to Access THR RBR IER */
 870         UART_CLEAR_DLAB(uart);
 871
 872         UART_PUT_LCR(uart, lcr);
 873
 874         /* Enable UART */
 875         UART_ENABLE_INTS(uart, ier);
 876
 877         val = UART_GET_GCTL(uart);
 878         val |= UCEN;
 879         UART_PUT_GCTL(uart, val);
 880
 881         /* Port speed changed, update the per-port timeout. */
 882         uart_update_timeout(port, termios->c_cflag, baud);
 883
 884         spin_unlock_irqrestore(&uart->port.lock, flags);
 885 }
 886
 887 static const char *bfin_serial_type(struct uart_port *port)
 888 {
 889         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 890
 891         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 892 }
 893
 894 /*
 895  * Release the memory region(s) being used by 'port'.
 896  */
 897 static void bfin_serial_release_port(struct uart_port *port)
 898 {
 899 }
 900
 901 /*
 902  * Request the memory region(s) being used by 'port'.
 903  */
 904 static int bfin_serial_request_port(struct uart_port *port)
 905 {
 906         return 0;
 907 }
 908
 909 /*
 910  * Configure/autoconfigure the port.
 911  */
 912 static void bfin_serial_config_port(struct uart_port *port, int flags)
 913 {
 914         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 915
 916         if (flags & UART_CONFIG_TYPE &&
 917             bfin_serial_request_port(&uart->port) == 0)
 918                 uart->port.type = PORT_BFIN;
 919 }
 920
 921 /*
 922  * Verify the new serial_struct (for TIOCSSERIAL).
 923  * The only change we allow are to the flags and type, and
 924  * even then only between PORT_BFIN and PORT_UNKNOWN
 925  */
 926 static int
 927 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 928 {
 929         return 0;
 930 }
 931
 932 /*
 933  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 934  * In other cases, disable IrDA function.
 935  */
 936 static void bfin_serial_set_ldisc(struct uart_port *port)
 937 {
 938         int line = port->line;
 939         unsigned short val;
 940
 941         if (line >= port->info->port.tty->driver->num)
 942                 return;
 943
 944         switch (port->info->port.tty->termios->c_line) {
 945         case N_IRDA:
 946                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 947                 val |= (IREN | RPOLC);
 948                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 949                 break;
 950         default:
 951                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
 952                 val &= ~(IREN | RPOLC);
 953                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
 954         }
 955 }
 956
 957 static void bfin_serial_reset_irda(struct uart_port *port)
 958 {
 959         int line = port->line;
 960         unsigned short val;
 961
 962         val = UART_GET_GCTL(&bfin_serial_ports[line]);
 963         val &= ~(IREN | RPOLC);
 964         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 965         SSYNC();
 966         val |= (IREN | RPOLC);
 967         UART_PUT_GCTL(&bfin_serial_ports[line], val);
 968         SSYNC();
 969 }
 970
 971 #ifdef CONFIG_CONSOLE_POLL
 972 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
 973 {
 974         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 975
 976         while (!(UART_GET_LSR(uart) & THRE))
 977                 cpu_relax();
 978
 979         UART_CLEAR_DLAB(uart);
 980         UART_PUT_CHAR(uart, (unsigned char)chr);
 981 }
 982
 983 static int bfin_serial_poll_get_char(struct uart_port *port)
 984 {
 985         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 986         unsigned char chr;
 987
 988         while (!(UART_GET_LSR(uart) & DR))
 989                 cpu_relax();
 990
 991         UART_CLEAR_DLAB(uart);
 992         chr = UART_GET_CHAR(uart);
 993
 994         return chr;
 995 }
 996 #endif
 997
 998 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 999         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1000 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
1001 {
1002         if (kgdboc_break_enabled) {
1003                 kgdboc_break_enabled = 0;
1004                 bfin_serial_shutdown(port);
1005         }
1006 }
1007
1008 static int bfin_kgdboc_port_startup(struct uart_port *port)
1009 {
1010         kgdboc_port_line = port->line;
1011         kgdboc_break_enabled = !bfin_serial_startup(port);
1012         return 0;
1013 }
1014 #endif
1015
1016 static struct uart_ops bfin_serial_pops = {
1017         .tx_empty       = bfin_serial_tx_empty,
1018         .set_mctrl      = bfin_serial_set_mctrl,
1019         .get_mctrl      = bfin_serial_get_mctrl,
1020         .stop_tx        = bfin_serial_stop_tx,
1021         .start_tx       = bfin_serial_start_tx,
1022         .stop_rx        = bfin_serial_stop_rx,
1023         .enable_ms      = bfin_serial_enable_ms,
1024         .break_ctl      = bfin_serial_break_ctl,
1025         .startup        = bfin_serial_startup,
1026         .shutdown       = bfin_serial_shutdown,
1027         .set_termios    = bfin_serial_set_termios,
1028         .set_ldisc      = bfin_serial_set_ldisc,
1029         .type           = bfin_serial_type,
1030         .release_port   = bfin_serial_release_port,
1031         .request_port   = bfin_serial_request_port,
1032         .config_port    = bfin_serial_config_port,
1033         .verify_port    = bfin_serial_verify_port,
1034 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1035         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1036         .kgdboc_port_startup    = bfin_kgdboc_port_startup,
1037         .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
1038 #endif
1039 #ifdef CONFIG_CONSOLE_POLL
1040         .poll_put_char  = bfin_serial_poll_put_char,
1041         .poll_get_char  = bfin_serial_poll_get_char,
1042 #endif
1043 };
1044
1045 static void __init bfin_serial_hw_init(void)
1046 {
1047 #ifdef CONFIG_SERIAL_BFIN_UART0
1048         peripheral_request(P_UART0_TX, DRIVER_NAME);
1049         peripheral_request(P_UART0_RX, DRIVER_NAME);
1050 #endif
1051
1052 #ifdef CONFIG_SERIAL_BFIN_UART1
1053         peripheral_request(P_UART1_TX, DRIVER_NAME);
1054         peripheral_request(P_UART1_RX, DRIVER_NAME);
1055
1056 # if defined(CONFIG_BFIN_UART1_CTSRTS) && defined(CONFIG_BF54x)
1057         peripheral_request(P_UART1_RTS, DRIVER_NAME);
1058         peripheral_request(P_UART1_CTS, DRIVER_NAME);
1059 # endif
1060 #endif
1061
1062 #ifdef CONFIG_SERIAL_BFIN_UART2
1063         peripheral_request(P_UART2_TX, DRIVER_NAME);
1064         peripheral_request(P_UART2_RX, DRIVER_NAME);
1065 #endif
1066
1067 #ifdef CONFIG_SERIAL_BFIN_UART3
1068         peripheral_request(P_UART3_TX, DRIVER_NAME);
1069         peripheral_request(P_UART3_RX, DRIVER_NAME);
1070
1071 # if defined(CONFIG_BFIN_UART3_CTSRTS) && defined(CONFIG_BF54x)
1072         peripheral_request(P_UART3_RTS, DRIVER_NAME);
1073         peripheral_request(P_UART3_CTS, DRIVER_NAME);
1074 # endif
1075 #endif
1076 }
1077
1078 static void __init bfin_serial_init_ports(void)
1079 {
1080         static int first = 1;
1081         int i;
1082
1083         if (!first)
1084                 return;
1085         first = 0;
1086
1087         bfin_serial_hw_init();
1088
1089         for (i = 0; i < nr_active_ports; i++) {
1090                 bfin_serial_ports[i].port.uartclk   = get_sclk();
1091                 bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1092                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
1093                 bfin_serial_ports[i].port.line      = i;
1094                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
1095                 bfin_serial_ports[i].port.membase   =
1096                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
1097                 bfin_serial_ports[i].port.mapbase   =
1098                         bfin_serial_resource[i].uart_base_addr;
1099                 bfin_serial_ports[i].port.irq       =
1100                         bfin_serial_resource[i].uart_irq;
1101                 bfin_serial_ports[i].status_irq     =
1102                         bfin_serial_resource[i].uart_status_irq;
1103                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
1104 #ifdef CONFIG_SERIAL_BFIN_DMA
1105                 bfin_serial_ports[i].tx_done        = 1;
1106                 bfin_serial_ports[i].tx_count       = 0;
1107                 bfin_serial_ports[i].tx_dma_channel =
1108                         bfin_serial_resource[i].uart_tx_dma_channel;
1109                 bfin_serial_ports[i].rx_dma_channel =
1110                         bfin_serial_resource[i].uart_rx_dma_channel;
1111                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
1112 #endif
1113 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1114         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1115                 bfin_serial_ports[i].cts_pin        =
1116                         bfin_serial_resource[i].uart_cts_pin;
1117                 bfin_serial_ports[i].rts_pin        =
1118                         bfin_serial_resource[i].uart_rts_pin;
1119 #endif
1120         }
1121 }
1122
1123 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1124 /*
1125  * If the port was already initialised (eg, by a boot loader),
1126  * try to determine the current setup.
1127  */
1128 static void __init
1129 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1130                            int *parity, int *bits)
1131 {
1132         unsigned short status;
1133
1134         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1135         if (status == (ERBFI | ETBEI)) {
1136                 /* ok, the port was enabled */
1137                 u16 lcr, dlh, dll;
1138
1139                 lcr = UART_GET_LCR(uart);
1140
1141                 *parity = 'n';
1142                 if (lcr & PEN) {
1143                         if (lcr & EPS)
1144                                 *parity = 'e';
1145                         else
1146                                 *parity = 'o';
1147                 }
1148                 switch (lcr & 0x03) {
1149                         case 0: *bits = 5; break;
1150                         case 1: *bits = 6; break;
1151                         case 2: *bits = 7; break;
1152                         case 3: *bits = 8; break;
1153                 }
1154                 /* Set DLAB in LCR to Access DLL and DLH */
1155                 UART_SET_DLAB(uart);
1156
1157                 dll = UART_GET_DLL(uart);
1158                 dlh = UART_GET_DLH(uart);
1159
1160                 /* Clear DLAB in LCR to Access THR RBR IER */
1161                 UART_CLEAR_DLAB(uart);
1162
1163                 *baud = get_sclk() / (16*(dll | dlh << 8));
1164         }
1165         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1166 }
1167
1168 static struct uart_driver bfin_serial_reg;
1169
1170 static int __init
1171 bfin_serial_console_setup(struct console *co, char *options)
1172 {
1173         struct bfin_serial_port *uart;
1174         int baud = 57600;
1175         int bits = 8;
1176         int parity = 'n';
1177 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1178         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1179         int flow = 'r';
1180 # else
1181         int flow = 'n';
1182 # endif
1183
1184         /*
1185          * Check whether an invalid uart number has been specified, and
1186          * if so, search for the first available port that does have
1187          * console support.
1188          */
1189         if (co->index == -1 || co->index >= nr_active_ports)
1190                 co->index = 0;
1191         uart = &bfin_serial_ports[co->index];
1192
1193         if (options)
1194                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1195         else
1196                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1197
1198         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1199 }
1200 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1201                                  defined (CONFIG_EARLY_PRINTK) */
1202
1203 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1204 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1205 {
1206         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1207         while (!(UART_GET_LSR(uart) & THRE))
1208                 barrier();
1209         UART_PUT_CHAR(uart, ch);
1210         SSYNC();
1211 }
1212
1213 /*
1214  * Interrupts are disabled on entering
1215  */
1216 static void
1217 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1218 {
1219         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1220         unsigned long flags;
1221
1222         spin_lock_irqsave(&uart->port.lock, flags);
1223         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1224         spin_unlock_irqrestore(&uart->port.lock, flags);
1225
1226 }
1227
1228 static struct console bfin_serial_console = {
1229         .name           = BFIN_SERIAL_NAME,
1230         .write          = bfin_serial_console_write,
1231         .device         = uart_console_device,
1232         .setup          = bfin_serial_console_setup,
1233         .flags          = CON_PRINTBUFFER,
1234         .index          = -1,
1235         .data           = &bfin_serial_reg,
1236 };
1237
1238 static int __init bfin_serial_rs_console_init(void)
1239 {
1240         bfin_serial_init_ports();
1241         register_console(&bfin_serial_console);
1242
1243         return 0;
1244 }
1245 console_initcall(bfin_serial_rs_console_init);
1246
1247 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1248 #else
1249 #define BFIN_SERIAL_CONSOLE     NULL
1250 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1251
1252
1253 #ifdef CONFIG_EARLY_PRINTK
1254 static __init void early_serial_putc(struct uart_port *port, int ch)
1255 {
1256         unsigned timeout = 0xffff;
1257         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1258
1259         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1260                 cpu_relax();
1261         UART_PUT_CHAR(uart, ch);
1262 }
1263
1264 static __init void early_serial_write(struct console *con, const char *s,
1265                                         unsigned int n)
1266 {
1267         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1268         unsigned int i;
1269
1270         for (i = 0; i < n; i++, s++) {
1271                 if (*s == '\n')
1272                         early_serial_putc(&uart->port, '\r');
1273                 early_serial_putc(&uart->port, *s);
1274         }
1275 }
1276
1277 /*
1278  * This should have a .setup or .early_setup in it, but then things get called
1279  * without the command line options, and the baud rate gets messed up - so
1280  * don't let the common infrastructure play with things. (see calls to setup
1281  * & earlysetup in ./kernel/printk.c:register_console()
1282  */
1283 static struct __initdata console bfin_early_serial_console = {
1284         .name = "early_BFuart",
1285         .write = early_serial_write,
1286         .device = uart_console_device,
1287         .flags = CON_PRINTBUFFER,
1288         .index = -1,
1289         .data  = &bfin_serial_reg,
1290 };
1291
1292 struct console __init *bfin_earlyserial_init(unsigned int port,
1293                                                 unsigned int cflag)
1294 {
1295         struct bfin_serial_port *uart;
1296         struct ktermios t;
1297
1298         if (port == -1 || port >= nr_active_ports)
1299                 port = 0;
1300         bfin_serial_init_ports();
1301         bfin_early_serial_console.index = port;
1302         uart = &bfin_serial_ports[port];
1303         t.c_cflag = cflag;
1304         t.c_iflag = 0;
1305         t.c_oflag = 0;
1306         t.c_lflag = ICANON;
1307         t.c_line = port;
1308         bfin_serial_set_termios(&uart->port, &t, &t);
1309         return &bfin_early_serial_console;
1310 }
1311
1312 #endif /* CONFIG_EARLY_PRINTK */
1313
1314 static struct uart_driver bfin_serial_reg = {
1315         .owner                  = THIS_MODULE,
1316         .driver_name            = "bfin-uart",
1317         .dev_name               = BFIN_SERIAL_NAME,
1318         .major                  = BFIN_SERIAL_MAJOR,
1319         .minor                  = BFIN_SERIAL_MINOR,
1320         .nr                     = BFIN_UART_NR_PORTS,
1321         .cons                   = BFIN_SERIAL_CONSOLE,
1322 };
1323
1324 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1325 {
1326         int i;
1327
1328         for (i = 0; i < nr_active_ports; i++) {
1329                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1330                         continue;
1331                 uart_suspend_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1332         }
1333
1334         return 0;
1335 }
1336
1337 static int bfin_serial_resume(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_resume_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1345         }
1346
1347         return 0;
1348 }
1349
1350 static int bfin_serial_probe(struct platform_device *dev)
1351 {
1352         struct resource *res = dev->resource;
1353         int i;
1354
1355         for (i = 0; i < dev->num_resources; i++, res++)
1356                 if (res->flags & IORESOURCE_MEM)
1357                         break;
1358
1359         if (i < dev->num_resources) {
1360                 for (i = 0; i < nr_active_ports; i++, res++) {
1361                         if (bfin_serial_ports[i].port.mapbase != res->start)
1362                                 continue;
1363                         bfin_serial_ports[i].port.dev = &dev->dev;
1364                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1365                 }
1366         }
1367
1368         return 0;
1369 }
1370
1371 static int bfin_serial_remove(struct platform_device *dev)
1372 {
1373         int i;
1374
1375         for (i = 0; i < nr_active_ports; i++) {
1376                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1377                         continue;
1378                 uart_remove_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1379                 bfin_serial_ports[i].port.dev = NULL;
1380 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1381         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1382                 gpio_free(bfin_serial_ports[i].cts_pin);
1383                 gpio_free(bfin_serial_ports[i].rts_pin);
1384 #endif
1385         }
1386
1387         return 0;
1388 }
1389
1390 static struct platform_driver bfin_serial_driver = {
1391         .probe          = bfin_serial_probe,
1392         .remove         = bfin_serial_remove,
1393         .suspend        = bfin_serial_suspend,
1394         .resume         = bfin_serial_resume,
1395         .driver         = {
1396                 .name   = "bfin-uart",
1397                 .owner  = THIS_MODULE,
1398         },
1399 };
1400
1401 static int __init bfin_serial_init(void)
1402 {
1403         int ret;
1404
1405         pr_info("Serial: Blackfin serial driver\n");
1406
1407         bfin_serial_init_ports();
1408
1409         ret = uart_register_driver(&bfin_serial_reg);
1410         if (ret == 0) {
1411                 ret = platform_driver_register(&bfin_serial_driver);
1412                 if (ret) {
1413                         pr_debug("uart register failed\n");
1414                         uart_unregister_driver(&bfin_serial_reg);
1415                 }
1416         }
1417         return ret;
1418 }
1419
1420 static void __exit bfin_serial_exit(void)
1421 {
1422         platform_driver_unregister(&bfin_serial_driver);
1423         uart_unregister_driver(&bfin_serial_reg);
1424 }
1425
1426
1427 module_init(bfin_serial_init);
1428 module_exit(bfin_serial_exit);
1429
1430 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1431 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1432 MODULE_LICENSE("GPL");
1433 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1434 MODULE_ALIAS("platform:bfin-uart");