drivers/tty/serial/bfin_uart.c

   1 /*
   2  * Blackfin On-Chip Serial Driver
   3  *
   4  * Copyright 2006-2011 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 #define DRIVER_NAME "bfin-uart"
  16 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  17
  18 #include <linux/module.h>
  19 #include <linux/ioport.h>
  20 #include <linux/gfp.h>
  21 #include <linux/io.h>
  22 #include <linux/init.h>
  23 #include <linux/console.h>
  24 #include <linux/sysrq.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/tty.h>
  27 #include <linux/tty_flip.h>
  28 #include <linux/serial_core.h>
  29 #include <linux/gpio.h>
  30 #include <linux/irq.h>
  31 #include <linux/kgdb.h>
  32 #include <linux/slab.h>
  33 #include <linux/dma-mapping.h>
  34
  35 #include <asm/portmux.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/dma.h>
  38 #include <asm/bfin_serial.h>
  39
  40 #ifdef CONFIG_SERIAL_BFIN_MODULE
  41 # undef CONFIG_EARLY_PRINTK
  42 #endif
  43
  44 /* UART name and device definitions */
  45 #define BFIN_SERIAL_DEV_NAME    "ttyBF"
  46 #define BFIN_SERIAL_MAJOR       204
  47 #define BFIN_SERIAL_MINOR       64
  48
  49 static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
  50
  51 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
  52         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
  53
  54 # ifndef CONFIG_SERIAL_BFIN_PIO
  55 #  error KGDB only support UART in PIO mode.
  56 # endif
  57
  58 static int kgdboc_port_line;
  59 static int kgdboc_break_enabled;
  60 #endif
  61 /*
  62  * Setup for console. Argument comes from the menuconfig
  63  */
  64 #define DMA_RX_XCOUNT           512
  65 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  66
  67 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
  68
  69 #ifdef CONFIG_SERIAL_BFIN_DMA
  70 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  71 #else
  72 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  73 #endif
  74
  75 static void bfin_serial_reset_irda(struct uart_port *port);
  76
  77 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
  78         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
  79 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
  80 {
  81         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  82         if (uart->cts_pin < 0)
  83                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
  84
  85         /* CTS PIN is negative assertive. */
  86         if (UART_GET_CTS(uart))
  87                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
  88         else
  89                 return TIOCM_DSR | TIOCM_CAR;
  90 }
  91
  92 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
  93 {
  94         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  95         if (uart->rts_pin < 0)
  96                 return;
  97
  98         /* RTS PIN is negative assertive. */
  99         if (mctrl & TIOCM_RTS)
 100                 UART_ENABLE_RTS(uart);
 101         else
 102                 UART_DISABLE_RTS(uart);
 103 }
 104
 105 /*
 106  * Handle any change of modem status signal.
 107  */
 108 static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
 109 {
 110         struct bfin_serial_port *uart = dev_id;
 111         struct uart_port *uport = &uart->port;
 112         unsigned int status = bfin_serial_get_mctrl(uport);
 113 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 114
 115         UART_CLEAR_SCTS(uart);
 116         if (uport->hw_stopped) {
 117                 if (status) {
 118                         uport->hw_stopped = 0;
 119                         uart_write_wakeup(uport);
 120                 }
 121         } else {
 122                 if (!status)
 123                         uport->hw_stopped = 1;
 124         }
 125 #else
 126         uart_handle_cts_change(uport, status & TIOCM_CTS);
 127 #endif
 128
 129         return IRQ_HANDLED;
 130 }
 131 #else
 132 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 133 {
 134         return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 135 }
 136
 137 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 138 {
 139 }
 140 #endif
 141
 142 /*
 143  * interrupts are disabled on entry
 144  */
 145 static void bfin_serial_stop_tx(struct uart_port *port)
 146 {
 147         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 148 #ifdef CONFIG_SERIAL_BFIN_DMA
 149         struct circ_buf *xmit = &uart->port.state->xmit;
 150 #endif
 151
 152         while (!(UART_GET_LSR(uart) & TEMT))
 153                 cpu_relax();
 154
 155 #ifdef CONFIG_SERIAL_BFIN_DMA
 156         disable_dma(uart->tx_dma_channel);
 157         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 158         uart->port.icount.tx += uart->tx_count;
 159         uart->tx_count = 0;
 160         uart->tx_done = 1;
 161 #else
 162 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
 163         /* Clear TFI bit */
 164         UART_PUT_LSR(uart, TFI);
 165 #endif
 166         UART_CLEAR_IER(uart, ETBEI);
 167 #endif
 168 }
 169
 170 /*
 171  * port is locked and interrupts are disabled
 172  */
 173 static void bfin_serial_start_tx(struct uart_port *port)
 174 {
 175         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 176         struct tty_struct *tty = uart->port.state->port.tty;
 177
 178         /*
 179          * To avoid losting RX interrupt, we reset IR function
 180          * before sending data.
 181          */
 182         if (tty->termios.c_line == N_IRDA)
 183                 bfin_serial_reset_irda(port);
 184
 185 #ifdef CONFIG_SERIAL_BFIN_DMA
 186         if (uart->tx_done)
 187                 bfin_serial_dma_tx_chars(uart);
 188 #else
 189         UART_SET_IER(uart, ETBEI);
 190         bfin_serial_tx_chars(uart);
 191 #endif
 192 }
 193
 194 /*
 195  * Interrupts are enabled
 196  */
 197 static void bfin_serial_stop_rx(struct uart_port *port)
 198 {
 199         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 200
 201         UART_CLEAR_IER(uart, ERBFI);
 202 }
 203
 204 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
 205 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 206 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 207 #else
 208 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 209 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 210 #endif
 211
 212 #ifdef CONFIG_SERIAL_BFIN_PIO
 213 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 214 {
 215         unsigned int status, ch, flg;
 216         static struct timeval anomaly_start = { .tv_sec = 0 };
 217
 218         status = UART_GET_LSR(uart);
 219         UART_CLEAR_LSR(uart);
 220
 221         ch = UART_GET_CHAR(uart);
 222         uart->port.icount.rx++;
 223
 224 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 225         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 226         if (kgdb_connected && kgdboc_port_line == uart->port.line
 227                 && kgdboc_break_enabled)
 228                 if (ch == 0x3) {/* Ctrl + C */
 229                         kgdb_breakpoint();
 230                         return;
 231                 }
 232
 233         if (!uart->port.state)
 234                 return;
 235 #endif
 236         if (ANOMALY_05000363) {
 237                 /* The BF533 (and BF561) family of processors have a nice anomaly
 238                  * where they continuously generate characters for a "single" break.
 239                  * We have to basically ignore this flood until the "next" valid
 240                  * character comes across.  Due to the nature of the flood, it is
 241                  * not possible to reliably catch bytes that are sent too quickly
 242                  * after this break.  So application code talking to the Blackfin
 243                  * which sends a break signal must allow at least 1.5 character
 244                  * times after the end of the break for things to stabilize.  This
 245                  * timeout was picked as it must absolutely be larger than 1
 246                  * character time +/- some percent.  So 1.5 sounds good.  All other
 247                  * Blackfin families operate properly.  Woo.
 248                  */
 249                 if (anomaly_start.tv_sec) {
 250                         struct timeval curr;
 251                         suseconds_t usecs;
 252
 253                         if ((~ch & (~ch + 1)) & 0xff)
 254                                 goto known_good_char;
 255
 256                         do_gettimeofday(&curr);
 257                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
 258                                 goto known_good_char;
 259
 260                         usecs = 0;
 261                         if (curr.tv_sec != anomaly_start.tv_sec)
 262                                 usecs += USEC_PER_SEC;
 263                         usecs += curr.tv_usec - anomaly_start.tv_usec;
 264
 265                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
 266                                 goto known_good_char;
 267
 268                         if (ch)
 269                                 anomaly_start.tv_sec = 0;
 270                         else
 271                                 anomaly_start = curr;
 272
 273                         return;
 274
 275  known_good_char:
 276                         status &= ~BI;
 277                         anomaly_start.tv_sec = 0;
 278                 }
 279         }
 280
 281         if (status & BI) {
 282                 if (ANOMALY_05000363)
 283                         if (bfin_revid() < 5)
 284                                 do_gettimeofday(&anomaly_start);
 285                 uart->port.icount.brk++;
 286                 if (uart_handle_break(&uart->port))
 287                         goto ignore_char;
 288                 status &= ~(PE | FE);
 289         }
 290         if (status & PE)
 291                 uart->port.icount.parity++;
 292         if (status & OE)
 293                 uart->port.icount.overrun++;
 294         if (status & FE)
 295                 uart->port.icount.frame++;
 296
 297         status &= uart->port.read_status_mask;
 298
 299         if (status & BI)
 300                 flg = TTY_BREAK;
 301         else if (status & PE)
 302                 flg = TTY_PARITY;
 303         else if (status & FE)
 304                 flg = TTY_FRAME;
 305         else
 306                 flg = TTY_NORMAL;
 307
 308         if (uart_handle_sysrq_char(&uart->port, ch))
 309                 goto ignore_char;
 310
 311         uart_insert_char(&uart->port, status, OE, ch, flg);
 312
 313  ignore_char:
 314         tty_flip_buffer_push(&uart->port.state->port);
 315 }
 316
 317 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 318 {
 319         struct circ_buf *xmit = &uart->port.state->xmit;
 320
 321         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 322 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
 323                 /* Clear TFI bit */
 324                 UART_PUT_LSR(uart, TFI);
 325 #endif
 326                 /* Anomaly notes:
 327                  *  05000215 -  we always clear ETBEI within last UART TX
 328                  *              interrupt to end a string. It is always set
 329                  *              when start a new tx.
 330                  */
 331                 UART_CLEAR_IER(uart, ETBEI);
 332                 return;
 333         }
 334
 335         if (uart->port.x_char) {
 336                 UART_PUT_CHAR(uart, uart->port.x_char);
 337                 uart->port.icount.tx++;
 338                 uart->port.x_char = 0;
 339         }
 340
 341         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 342                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 343                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 344                 uart->port.icount.tx++;
 345         }
 346
 347         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 348                 uart_write_wakeup(&uart->port);
 349 }
 350
 351 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 352 {
 353         struct bfin_serial_port *uart = dev_id;
 354
 355         while (UART_GET_LSR(uart) & DR)
 356                 bfin_serial_rx_chars(uart);
 357
 358         return IRQ_HANDLED;
 359 }
 360
 361 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 362 {
 363         struct bfin_serial_port *uart = dev_id;
 364
 365         spin_lock(&uart->port.lock);
 366         if (UART_GET_LSR(uart) & THRE)
 367                 bfin_serial_tx_chars(uart);
 368         spin_unlock(&uart->port.lock);
 369
 370         return IRQ_HANDLED;
 371 }
 372 #endif
 373
 374 #ifdef CONFIG_SERIAL_BFIN_DMA
 375 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 376 {
 377         struct circ_buf *xmit = &uart->port.state->xmit;
 378
 379         uart->tx_done = 0;
 380
 381         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 382                 uart->tx_count = 0;
 383                 uart->tx_done = 1;
 384                 return;
 385         }
 386
 387         if (uart->port.x_char) {
 388                 UART_PUT_CHAR(uart, uart->port.x_char);
 389                 uart->port.icount.tx++;
 390                 uart->port.x_char = 0;
 391         }
 392
 393         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 394         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 395                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 396         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 397                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 398         set_dma_config(uart->tx_dma_channel,
 399                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 400                         INTR_ON_BUF,
 401                         DIMENSION_LINEAR,
 402                         DATA_SIZE_8,
 403                         DMA_SYNC_RESTART));
 404         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 405         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 406         set_dma_x_modify(uart->tx_dma_channel, 1);
 407         SSYNC();
 408         enable_dma(uart->tx_dma_channel);
 409
 410         UART_SET_IER(uart, ETBEI);
 411 }
 412
 413 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 414 {
 415         int i, flg, status;
 416
 417         status = UART_GET_LSR(uart);
 418         UART_CLEAR_LSR(uart);
 419
 420         uart->port.icount.rx +=
 421                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 422                 UART_XMIT_SIZE);
 423
 424         if (status & BI) {
 425                 uart->port.icount.brk++;
 426                 if (uart_handle_break(&uart->port))
 427                         goto dma_ignore_char;
 428                 status &= ~(PE | FE);
 429         }
 430         if (status & PE)
 431                 uart->port.icount.parity++;
 432         if (status & OE)
 433                 uart->port.icount.overrun++;
 434         if (status & FE)
 435                 uart->port.icount.frame++;
 436
 437         status &= uart->port.read_status_mask;
 438
 439         if (status & BI)
 440                 flg = TTY_BREAK;
 441         else if (status & PE)
 442                 flg = TTY_PARITY;
 443         else if (status & FE)
 444                 flg = TTY_FRAME;
 445         else
 446                 flg = TTY_NORMAL;
 447
 448         for (i = uart->rx_dma_buf.tail; ; i++) {
 449                 if (i >= UART_XMIT_SIZE)
 450                         i = 0;
 451                 if (i == uart->rx_dma_buf.head)
 452                         break;
 453                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 454                         uart_insert_char(&uart->port, status, OE,
 455                                 uart->rx_dma_buf.buf[i], flg);
 456         }
 457
 458  dma_ignore_char:
 459         tty_flip_buffer_push(&uart->port.state->port);
 460 }
 461
 462 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 463 {
 464         int x_pos, pos;
 465         unsigned long flags;
 466
 467         spin_lock_irqsave(&uart->rx_lock, flags);
 468
 469         /* 2D DMA RX buffer ring is used. Because curr_y_count and
 470          * curr_x_count can't be read as an atomic operation,
 471          * curr_y_count should be read before curr_x_count. When
 472          * curr_x_count is read, curr_y_count may already indicate
 473          * next buffer line. But, the position calculated here is
 474          * still indicate the old line. The wrong position data may
 475          * be smaller than current buffer tail, which cause garbages
 476          * are received if it is not prohibit.
 477          */
 478         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 479         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 480         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 481         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
 482                 uart->rx_dma_nrows = 0;
 483         x_pos = DMA_RX_XCOUNT - x_pos;
 484         if (x_pos == DMA_RX_XCOUNT)
 485                 x_pos = 0;
 486
 487         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 488         /* Ignore receiving data if new position is in the same line of
 489          * current buffer tail and small.
 490          */
 491         if (pos > uart->rx_dma_buf.tail ||
 492                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
 493                 uart->rx_dma_buf.head = pos;
 494                 bfin_serial_dma_rx_chars(uart);
 495                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 496         }
 497
 498         spin_unlock_irqrestore(&uart->rx_lock, flags);
 499
 500         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 501 }
 502
 503 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 504 {
 505         struct bfin_serial_port *uart = dev_id;
 506         struct circ_buf *xmit = &uart->port.state->xmit;
 507
 508         spin_lock(&uart->port.lock);
 509         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 510                 disable_dma(uart->tx_dma_channel);
 511                 clear_dma_irqstat(uart->tx_dma_channel);
 512                 /* Anomaly notes:
 513                  *  05000215 -  we always clear ETBEI within last UART TX
 514                  *              interrupt to end a string. It is always set
 515                  *              when start a new tx.
 516                  */
 517                 UART_CLEAR_IER(uart, ETBEI);
 518                 uart->port.icount.tx += uart->tx_count;
 519                 if (!(xmit->tail == 0 && xmit->head == 0)) {
 520                         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 521
 522                         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 523                                 uart_write_wakeup(&uart->port);
 524                 }
 525
 526                 bfin_serial_dma_tx_chars(uart);
 527         }
 528
 529         spin_unlock(&uart->port.lock);
 530         return IRQ_HANDLED;
 531 }
 532
 533 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 534 {
 535         struct bfin_serial_port *uart = dev_id;
 536         unsigned int irqstat;
 537         int x_pos, pos;
 538
 539         spin_lock(&uart->rx_lock);
 540         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 541         clear_dma_irqstat(uart->rx_dma_channel);
 542
 543         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 544         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 545         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 546         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
 547                 uart->rx_dma_nrows = 0;
 548
 549         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
 550         if (pos > uart->rx_dma_buf.tail ||
 551                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
 552                 uart->rx_dma_buf.head = pos;
 553                 bfin_serial_dma_rx_chars(uart);
 554                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 555         }
 556
 557         spin_unlock(&uart->rx_lock);
 558
 559         return IRQ_HANDLED;
 560 }
 561 #endif
 562
 563 /*
 564  * Return TIOCSER_TEMT when transmitter is not busy.
 565  */
 566 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 567 {
 568         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 569         unsigned int lsr;
 570
 571         lsr = UART_GET_LSR(uart);
 572         if (lsr & TEMT)
 573                 return TIOCSER_TEMT;
 574         else
 575                 return 0;
 576 }
 577
 578 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 579 {
 580         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 581         u32 lcr = UART_GET_LCR(uart);
 582         if (break_state)
 583                 lcr |= SB;
 584         else
 585                 lcr &= ~SB;
 586         UART_PUT_LCR(uart, lcr);
 587         SSYNC();
 588 }
 589
 590 static int bfin_serial_startup(struct uart_port *port)
 591 {
 592         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 593
 594 #ifdef CONFIG_SERIAL_BFIN_DMA
 595         dma_addr_t dma_handle;
 596
 597         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 598                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 599                 return -EBUSY;
 600         }
 601
 602         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 603                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 604                 free_dma(uart->rx_dma_channel);
 605                 return -EBUSY;
 606         }
 607
 608         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 609         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 610
 611         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 612         uart->rx_dma_buf.head = 0;
 613         uart->rx_dma_buf.tail = 0;
 614         uart->rx_dma_nrows = 0;
 615
 616         set_dma_config(uart->rx_dma_channel,
 617                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 618                                 INTR_ON_ROW, DIMENSION_2D,
 619                                 DATA_SIZE_8,
 620                                 DMA_SYNC_RESTART));
 621         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 622         set_dma_x_modify(uart->rx_dma_channel, 1);
 623         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 624         set_dma_y_modify(uart->rx_dma_channel, 1);
 625         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 626         enable_dma(uart->rx_dma_channel);
 627
 628         uart->rx_dma_timer.data = (unsigned long)(uart);
 629         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 630         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 631         add_timer(&(uart->rx_dma_timer));
 632 #else
 633 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 634         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 635         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 636                 kgdboc_break_enabled = 0;
 637         else {
 638 # endif
 639         if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
 640              "BFIN_UART_RX", uart)) {
 641                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 642                 return -EBUSY;
 643         }
 644
 645         if (request_irq
 646             (uart->tx_irq, bfin_serial_tx_int, 0,
 647              "BFIN_UART_TX", uart)) {
 648                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 649                 free_irq(uart->rx_irq, uart);
 650                 return -EBUSY;
 651         }
 652
 653 # ifdef CONFIG_BF54x
 654         {
 655                 /*
 656                  * UART2 and UART3 on BF548 share interrupt PINs and DMA
 657                  * controllers with SPORT2 and SPORT3. UART rx and tx
 658                  * interrupts are generated in PIO mode only when configure
 659                  * their peripheral mapping registers properly, which means
 660                  * request corresponding DMA channels in PIO mode as well.
 661                  */
 662                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 663
 664                 switch (uart->rx_irq) {
 665                 case IRQ_UART3_RX:
 666                         uart_dma_ch_rx = CH_UART3_RX;
 667                         uart_dma_ch_tx = CH_UART3_TX;
 668                         break;
 669                 case IRQ_UART2_RX:
 670                         uart_dma_ch_rx = CH_UART2_RX;
 671                         uart_dma_ch_tx = CH_UART2_TX;
 672                         break;
 673                 default:
 674                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
 675                         break;
 676                 }
 677
 678                 if (uart_dma_ch_rx &&
 679                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 680                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
 681                         free_irq(uart->rx_irq, uart);
 682                         free_irq(uart->tx_irq, uart);
 683                         return -EBUSY;
 684                 }
 685                 if (uart_dma_ch_tx &&
 686                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 687                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 688                         free_dma(uart_dma_ch_rx);
 689                         free_irq(uart->rx_irq, uart);
 690                         free_irq(uart->tx_irq, uart);
 691                         return -EBUSY;
 692                 }
 693         }
 694 # endif
 695 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 696         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 697         }
 698 # endif
 699 #endif
 700
 701 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 702         if (uart->cts_pin >= 0) {
 703                 if (request_irq(gpio_to_irq(uart->cts_pin),
 704                         bfin_serial_mctrl_cts_int,
 705                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 706                         0, "BFIN_UART_CTS", uart)) {
 707                         uart->cts_pin = -1;
 708                         pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
 709                 }
 710         }
 711         if (uart->rts_pin >= 0) {
 712                 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
 713                         pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
 714                         uart->rts_pin = -1;
 715                 } else
 716                         gpio_direction_output(uart->rts_pin, 0);
 717         }
 718 #endif
 719 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 720         if (uart->cts_pin >= 0) {
 721                 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
 722                         0, "BFIN_UART_MODEM_STATUS", uart)) {
 723                         uart->cts_pin = -1;
 724                         dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
 725                 }
 726
 727                 /* CTS RTS PINs are negative assertive. */
 728                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
 729                 UART_SET_IER(uart, EDSSI);
 730         }
 731 #endif
 732
 733         UART_SET_IER(uart, ERBFI);
 734         return 0;
 735 }
 736
 737 static void bfin_serial_shutdown(struct uart_port *port)
 738 {
 739         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 740
 741 #ifdef CONFIG_SERIAL_BFIN_DMA
 742         disable_dma(uart->tx_dma_channel);
 743         free_dma(uart->tx_dma_channel);
 744         disable_dma(uart->rx_dma_channel);
 745         free_dma(uart->rx_dma_channel);
 746         del_timer(&(uart->rx_dma_timer));
 747         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 748 #else
 749 #ifdef CONFIG_BF54x
 750         switch (uart->port.irq) {
 751         case IRQ_UART3_RX:
 752                 free_dma(CH_UART3_RX);
 753                 free_dma(CH_UART3_TX);
 754                 break;
 755         case IRQ_UART2_RX:
 756                 free_dma(CH_UART2_RX);
 757                 free_dma(CH_UART2_TX);
 758                 break;
 759         default:
 760                 break;
 761         }
 762 #endif
 763         free_irq(uart->rx_irq, uart);
 764         free_irq(uart->tx_irq, uart);
 765 #endif
 766
 767 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 768         if (uart->cts_pin >= 0)
 769                 free_irq(gpio_to_irq(uart->cts_pin), uart);
 770         if (uart->rts_pin >= 0)
 771                 gpio_free(uart->rts_pin);
 772 #endif
 773 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 774         if (uart->cts_pin >= 0)
 775                 free_irq(uart->status_irq, uart);
 776 #endif
 777 }
 778
 779 static void
 780 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 781                    struct ktermios *old)
 782 {
 783         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 784         unsigned long flags;
 785         unsigned int baud, quot;
 786         unsigned int ier, lcr = 0;
 787         unsigned long timeout;
 788
 789 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 790         if (old == NULL && uart->cts_pin != -1)
 791                 termios->c_cflag |= CRTSCTS;
 792         else if (uart->cts_pin == -1)
 793                 termios->c_cflag &= ~CRTSCTS;
 794 #endif
 795
 796         switch (termios->c_cflag & CSIZE) {
 797         case CS8:
 798                 lcr = WLS(8);
 799                 break;
 800         case CS7:
 801                 lcr = WLS(7);
 802                 break;
 803         case CS6:
 804                 lcr = WLS(6);
 805                 break;
 806         case CS5:
 807                 lcr = WLS(5);
 808                 break;
 809         default:
 810                 printk(KERN_ERR "%s: word length not supported\n",
 811                         __func__);
 812         }
 813
 814         /* Anomaly notes:
 815          *  05000231 -  STOP bit is always set to 1 whatever the user is set.
 816          */
 817         if (termios->c_cflag & CSTOPB) {
 818                 if (ANOMALY_05000231)
 819                         printk(KERN_WARNING "STOP bits other than 1 is not "
 820                                 "supported in case of anomaly 05000231.\n");
 821                 else
 822                         lcr |= STB;
 823         }
 824         if (termios->c_cflag & PARENB)
 825                 lcr |= PEN;
 826         if (!(termios->c_cflag & PARODD))
 827                 lcr |= EPS;
 828         if (termios->c_cflag & CMSPAR)
 829                 lcr |= STP;
 830
 831         spin_lock_irqsave(&uart->port.lock, flags);
 832
 833         port->read_status_mask = OE;
 834         if (termios->c_iflag & INPCK)
 835                 port->read_status_mask |= (FE | PE);
 836         if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
 837                 port->read_status_mask |= BI;
 838
 839         /*
 840          * Characters to ignore
 841          */
 842         port->ignore_status_mask = 0;
 843         if (termios->c_iflag & IGNPAR)
 844                 port->ignore_status_mask |= FE | PE;
 845         if (termios->c_iflag & IGNBRK) {
 846                 port->ignore_status_mask |= BI;
 847                 /*
 848                  * If we're ignoring parity and break indicators,
 849                  * ignore overruns too (for real raw support).
 850                  */
 851                 if (termios->c_iflag & IGNPAR)
 852                         port->ignore_status_mask |= OE;
 853         }
 854
 855         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 856         quot = uart_get_divisor(port, baud);
 857
 858         /* If discipline is not IRDA, apply ANOMALY_05000230 */
 859         if (termios->c_line != N_IRDA)
 860                 quot -= ANOMALY_05000230;
 861
 862         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 863
 864         /* Wait till the transfer buffer is empty */
 865         timeout = jiffies + msecs_to_jiffies(10);
 866         while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
 867                 if (time_after(jiffies, timeout)) {
 868                         dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
 869                         break;
 870                 }
 871
 872         /* Disable UART */
 873         ier = UART_GET_IER(uart);
 874         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
 875         UART_DISABLE_INTS(uart);
 876
 877         /* Set DLAB in LCR to Access CLK */
 878         UART_SET_DLAB(uart);
 879
 880         UART_PUT_CLK(uart, quot);
 881         SSYNC();
 882
 883         /* Clear DLAB in LCR to Access THR RBR IER */
 884         UART_CLEAR_DLAB(uart);
 885
 886         UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
 887
 888         /* Enable UART */
 889         UART_ENABLE_INTS(uart, ier);
 890         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
 891
 892         /* Port speed changed, update the per-port timeout. */
 893         uart_update_timeout(port, termios->c_cflag, baud);
 894
 895         spin_unlock_irqrestore(&uart->port.lock, flags);
 896 }
 897
 898 static const char *bfin_serial_type(struct uart_port *port)
 899 {
 900         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 901
 902         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 903 }
 904
 905 /*
 906  * Release the memory region(s) being used by 'port'.
 907  */
 908 static void bfin_serial_release_port(struct uart_port *port)
 909 {
 910 }
 911
 912 /*
 913  * Request the memory region(s) being used by 'port'.
 914  */
 915 static int bfin_serial_request_port(struct uart_port *port)
 916 {
 917         return 0;
 918 }
 919
 920 /*
 921  * Configure/autoconfigure the port.
 922  */
 923 static void bfin_serial_config_port(struct uart_port *port, int flags)
 924 {
 925         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 926
 927         if (flags & UART_CONFIG_TYPE &&
 928             bfin_serial_request_port(&uart->port) == 0)
 929                 uart->port.type = PORT_BFIN;
 930 }
 931
 932 /*
 933  * Verify the new serial_struct (for TIOCSSERIAL).
 934  * The only change we allow are to the flags and type, and
 935  * even then only between PORT_BFIN and PORT_UNKNOWN
 936  */
 937 static int
 938 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 939 {
 940         return 0;
 941 }
 942
 943 /*
 944  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 945  * In other cases, disable IrDA function.
 946  */
 947 static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
 948 {
 949         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 950         unsigned int val;
 951
 952         switch (ld) {
 953         case N_IRDA:
 954                 val = UART_GET_GCTL(uart);
 955                 val |= (UMOD_IRDA | RPOLC);
 956                 UART_PUT_GCTL(uart, val);
 957                 break;
 958         default:
 959                 val = UART_GET_GCTL(uart);
 960                 val &= ~(UMOD_MASK | RPOLC);
 961                 UART_PUT_GCTL(uart, val);
 962         }
 963 }
 964
 965 static void bfin_serial_reset_irda(struct uart_port *port)
 966 {
 967         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 968         unsigned int val;
 969
 970         val = UART_GET_GCTL(uart);
 971         val &= ~(UMOD_MASK | RPOLC);
 972         UART_PUT_GCTL(uart, val);
 973         SSYNC();
 974         val |= (UMOD_IRDA | RPOLC);
 975         UART_PUT_GCTL(uart, val);
 976         SSYNC();
 977 }
 978
 979 #ifdef CONFIG_CONSOLE_POLL
 980 /* Anomaly notes:
 981  *  05000099 -  Because we only use THRE in poll_put and DR in poll_get,
 982  *              losing other bits of UART_LSR is not a problem here.
 983  */
 984 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
 985 {
 986         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 987
 988         while (!(UART_GET_LSR(uart) & THRE))
 989                 cpu_relax();
 990
 991         UART_CLEAR_DLAB(uart);
 992         UART_PUT_CHAR(uart, (unsigned char)chr);
 993 }
 994
 995 static int bfin_serial_poll_get_char(struct uart_port *port)
 996 {
 997         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 998         unsigned char chr;
 999
1000         while (!(UART_GET_LSR(uart) & DR))
1001                 cpu_relax();
1002
1003         UART_CLEAR_DLAB(uart);
1004         chr = UART_GET_CHAR(uart);
1005
1006         return chr;
1007 }
1008 #endif
1009
1010 static struct uart_ops bfin_serial_pops = {
1011         .tx_empty       = bfin_serial_tx_empty,
1012         .set_mctrl      = bfin_serial_set_mctrl,
1013         .get_mctrl      = bfin_serial_get_mctrl,
1014         .stop_tx        = bfin_serial_stop_tx,
1015         .start_tx       = bfin_serial_start_tx,
1016         .stop_rx        = bfin_serial_stop_rx,
1017         .break_ctl      = bfin_serial_break_ctl,
1018         .startup        = bfin_serial_startup,
1019         .shutdown       = bfin_serial_shutdown,
1020         .set_termios    = bfin_serial_set_termios,
1021         .set_ldisc      = bfin_serial_set_ldisc,
1022         .type           = bfin_serial_type,
1023         .release_port   = bfin_serial_release_port,
1024         .request_port   = bfin_serial_request_port,
1025         .config_port    = bfin_serial_config_port,
1026         .verify_port    = bfin_serial_verify_port,
1027 #ifdef CONFIG_CONSOLE_POLL
1028         .poll_put_char  = bfin_serial_poll_put_char,
1029         .poll_get_char  = bfin_serial_poll_get_char,
1030 #endif
1031 };
1032
1033 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1034 /*
1035  * If the port was already initialised (eg, by a boot loader),
1036  * try to determine the current setup.
1037  */
1038 static void __init
1039 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1040                            int *parity, int *bits)
1041 {
1042         unsigned int status;
1043
1044         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1045         if (status == (ERBFI | ETBEI)) {
1046                 /* ok, the port was enabled */
1047                 u32 lcr, clk;
1048
1049                 lcr = UART_GET_LCR(uart);
1050
1051                 *parity = 'n';
1052                 if (lcr & PEN) {
1053                         if (lcr & EPS)
1054                                 *parity = 'e';
1055                         else
1056                                 *parity = 'o';
1057                 }
1058                 *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
1059
1060                 /* Set DLAB in LCR to Access CLK */
1061                 UART_SET_DLAB(uart);
1062
1063                 clk = UART_GET_CLK(uart);
1064
1065                 /* Clear DLAB in LCR to Access THR RBR IER */
1066                 UART_CLEAR_DLAB(uart);
1067
1068                 *baud = get_sclk() / (16*clk);
1069         }
1070         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1071 }
1072
1073 static struct uart_driver bfin_serial_reg;
1074
1075 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1076 {
1077         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1078         while (!(UART_GET_LSR(uart) & THRE))
1079                 barrier();
1080         UART_PUT_CHAR(uart, ch);
1081 }
1082
1083 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1084                  defined (CONFIG_EARLY_PRINTK) */
1085
1086 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1087 #define CLASS_BFIN_CONSOLE      "bfin-console"
1088 /*
1089  * Interrupts are disabled on entering
1090  */
1091 static void
1092 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1093 {
1094         struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1095         unsigned long flags;
1096
1097         spin_lock_irqsave(&uart->port.lock, flags);
1098         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1099         spin_unlock_irqrestore(&uart->port.lock, flags);
1100
1101 }
1102
1103 static int __init
1104 bfin_serial_console_setup(struct console *co, char *options)
1105 {
1106         struct bfin_serial_port *uart;
1107         int baud = 57600;
1108         int bits = 8;
1109         int parity = 'n';
1110 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1111         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1112         int flow = 'r';
1113 # else
1114         int flow = 'n';
1115 # endif
1116
1117         /*
1118          * Check whether an invalid uart number has been specified, and
1119          * if so, search for the first available port that does have
1120          * console support.
1121          */
1122         if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1123                 return -ENODEV;
1124
1125         uart = bfin_serial_ports[co->index];
1126         if (!uart)
1127                 return -ENODEV;
1128
1129         if (options)
1130                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1131         else
1132                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1133
1134         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1135 }
1136
1137 static struct console bfin_serial_console = {
1138         .name           = BFIN_SERIAL_DEV_NAME,
1139         .write          = bfin_serial_console_write,
1140         .device         = uart_console_device,
1141         .setup          = bfin_serial_console_setup,
1142         .flags          = CON_PRINTBUFFER,
1143         .index          = -1,
1144         .data           = &bfin_serial_reg,
1145 };
1146 #define BFIN_SERIAL_CONSOLE     (&bfin_serial_console)
1147 #else
1148 #define BFIN_SERIAL_CONSOLE     NULL
1149 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1150
1151 #ifdef  CONFIG_EARLY_PRINTK
1152 static struct bfin_serial_port bfin_earlyprintk_port;
1153 #define CLASS_BFIN_EARLYPRINTK  "bfin-earlyprintk"
1154
1155 /*
1156  * Interrupts are disabled on entering
1157  */
1158 static void
1159 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1160 {
1161         unsigned long flags;
1162
1163         if (bfin_earlyprintk_port.port.line != co->index)
1164                 return;
1165
1166         spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1167         uart_console_write(&bfin_earlyprintk_port.port, s, count,
1168                 bfin_serial_console_putchar);
1169         spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1170 }
1171
1172 /*
1173  * This should have a .setup or .early_setup in it, but then things get called
1174  * without the command line options, and the baud rate gets messed up - so
1175  * don't let the common infrastructure play with things. (see calls to setup
1176  * & earlysetup in ./kernel/printk.c:register_console()
1177  */
1178 static struct console bfin_early_serial_console __initdata = {
1179         .name = "early_BFuart",
1180         .write = bfin_earlyprintk_console_write,
1181         .device = uart_console_device,
1182         .flags = CON_PRINTBUFFER,
1183         .index = -1,
1184         .data  = &bfin_serial_reg,
1185 };
1186 #endif
1187
1188 static struct uart_driver bfin_serial_reg = {
1189         .owner                  = THIS_MODULE,
1190         .driver_name            = DRIVER_NAME,
1191         .dev_name               = BFIN_SERIAL_DEV_NAME,
1192         .major                  = BFIN_SERIAL_MAJOR,
1193         .minor                  = BFIN_SERIAL_MINOR,
1194         .nr                     = BFIN_UART_NR_PORTS,
1195         .cons                   = BFIN_SERIAL_CONSOLE,
1196 };
1197
1198 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1199 {
1200         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1201
1202         return uart_suspend_port(&bfin_serial_reg, &uart->port);
1203 }
1204
1205 static int bfin_serial_resume(struct platform_device *pdev)
1206 {
1207         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1208
1209         return uart_resume_port(&bfin_serial_reg, &uart->port);
1210 }
1211
1212 static int bfin_serial_probe(struct platform_device *pdev)
1213 {
1214         struct resource *res;
1215         struct bfin_serial_port *uart = NULL;
1216         int ret = 0;
1217
1218         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1219                 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1220                 return -ENOENT;
1221         }
1222
1223         if (bfin_serial_ports[pdev->id] == NULL) {
1224
1225                 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1226                 if (!uart) {
1227                         dev_err(&pdev->dev,
1228                                 "fail to malloc bfin_serial_port\n");
1229                         return -ENOMEM;
1230                 }
1231                 bfin_serial_ports[pdev->id] = uart;
1232
1233 #ifdef CONFIG_EARLY_PRINTK
1234                 if (!(bfin_earlyprintk_port.port.membase
1235                         && bfin_earlyprintk_port.port.line == pdev->id)) {
1236                         /*
1237                          * If the peripheral PINs of current port is allocated
1238                          * in earlyprintk probe stage, don't do it again.
1239                          */
1240 #endif
1241                 ret = peripheral_request_list(
1242                         dev_get_platdata(&pdev->dev),
1243                         DRIVER_NAME);
1244                 if (ret) {
1245                         dev_err(&pdev->dev,
1246                                 "fail to request bfin serial peripherals\n");
1247                         goto out_error_free_mem;
1248                 }
1249 #ifdef CONFIG_EARLY_PRINTK
1250                 }
1251 #endif
1252
1253                 spin_lock_init(&uart->port.lock);
1254                 uart->port.uartclk   = get_sclk();
1255                 uart->port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1256                 uart->port.ops       = &bfin_serial_pops;
1257                 uart->port.line      = pdev->id;
1258                 uart->port.iotype    = UPIO_MEM;
1259                 uart->port.flags     = UPF_BOOT_AUTOCONF;
1260
1261                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1262                 if (res == NULL) {
1263                         dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1264                         ret = -ENOENT;
1265                         goto out_error_free_peripherals;
1266                 }
1267
1268                 uart->port.membase = ioremap(res->start, resource_size(res));
1269                 if (!uart->port.membase) {
1270                         dev_err(&pdev->dev, "Cannot map uart IO\n");
1271                         ret = -ENXIO;
1272                         goto out_error_free_peripherals;
1273                 }
1274                 uart->port.mapbase = res->start;
1275
1276                 uart->tx_irq = platform_get_irq(pdev, 0);
1277                 if (uart->tx_irq < 0) {
1278                         dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1279                         ret = -ENOENT;
1280                         goto out_error_unmap;
1281                 }
1282
1283                 uart->rx_irq = platform_get_irq(pdev, 1);
1284                 if (uart->rx_irq < 0) {
1285                         dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1286                         ret = -ENOENT;
1287                         goto out_error_unmap;
1288                 }
1289                 uart->port.irq = uart->rx_irq;
1290
1291                 uart->status_irq = platform_get_irq(pdev, 2);
1292                 if (uart->status_irq < 0) {
1293                         dev_err(&pdev->dev, "No uart status IRQ specified\n");
1294                         ret = -ENOENT;
1295                         goto out_error_unmap;
1296                 }
1297
1298 #ifdef CONFIG_SERIAL_BFIN_DMA
1299                 spin_lock_init(&uart->rx_lock);
1300                 uart->tx_done       = 1;
1301                 uart->tx_count      = 0;
1302
1303                 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1304                 if (res == NULL) {
1305                         dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1306                         ret = -ENOENT;
1307                         goto out_error_unmap;
1308                 }
1309                 uart->tx_dma_channel = res->start;
1310
1311                 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1312                 if (res == NULL) {
1313                         dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1314                         ret = -ENOENT;
1315                         goto out_error_unmap;
1316                 }
1317                 uart->rx_dma_channel = res->start;
1318
1319                 init_timer(&(uart->rx_dma_timer));
1320 #endif
1321
1322 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1323         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1324                 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1325                 if (res == NULL)
1326                         uart->cts_pin = -1;
1327                 else
1328                         uart->cts_pin = res->start;
1329
1330                 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1331                 if (res == NULL)
1332                         uart->rts_pin = -1;
1333                 else
1334                         uart->rts_pin = res->start;
1335 #endif
1336         }
1337
1338 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1339         if (!is_early_platform_device(pdev)) {
1340 #endif
1341                 uart = bfin_serial_ports[pdev->id];
1342                 uart->port.dev = &pdev->dev;
1343                 dev_set_drvdata(&pdev->dev, uart);
1344                 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1345 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1346         }
1347 #endif
1348
1349         if (!ret)
1350                 return 0;
1351
1352         if (uart) {
1353 out_error_unmap:
1354                 iounmap(uart->port.membase);
1355 out_error_free_peripherals:
1356                 peripheral_free_list(dev_get_platdata(&pdev->dev));
1357 out_error_free_mem:
1358                 kfree(uart);
1359                 bfin_serial_ports[pdev->id] = NULL;
1360         }
1361
1362         return ret;
1363 }
1364
1365 static int bfin_serial_remove(struct platform_device *pdev)
1366 {
1367         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1368
1369         dev_set_drvdata(&pdev->dev, NULL);
1370
1371         if (uart) {
1372                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1373                 iounmap(uart->port.membase);
1374                 peripheral_free_list(dev_get_platdata(&pdev->dev));
1375                 kfree(uart);
1376                 bfin_serial_ports[pdev->id] = NULL;
1377         }
1378
1379         return 0;
1380 }
1381
1382 static struct platform_driver bfin_serial_driver = {
1383         .probe          = bfin_serial_probe,
1384         .remove         = bfin_serial_remove,
1385         .suspend        = bfin_serial_suspend,
1386         .resume         = bfin_serial_resume,
1387         .driver         = {
1388                 .name   = DRIVER_NAME,
1389                 .owner  = THIS_MODULE,
1390         },
1391 };
1392
1393 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1394 static struct early_platform_driver early_bfin_serial_driver __initdata = {
1395         .class_str = CLASS_BFIN_CONSOLE,
1396         .pdrv = &bfin_serial_driver,
1397         .requested_id = EARLY_PLATFORM_ID_UNSET,
1398 };
1399
1400 static int __init bfin_serial_rs_console_init(void)
1401 {
1402         early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1403
1404         early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1405
1406         register_console(&bfin_serial_console);
1407
1408         return 0;
1409 }
1410 console_initcall(bfin_serial_rs_console_init);
1411 #endif
1412
1413 #ifdef CONFIG_EARLY_PRINTK
1414 /*
1415  * Memory can't be allocated dynamically during earlyprink init stage.
1416  * So, do individual probe for earlyprink with a static uart port variable.
1417  */
1418 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1419 {
1420         struct resource *res;
1421         int ret;
1422
1423         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1424                 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1425                 return -ENOENT;
1426         }
1427
1428         ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
1429                                         DRIVER_NAME);
1430         if (ret) {
1431                 dev_err(&pdev->dev,
1432                                 "fail to request bfin serial peripherals\n");
1433                         return ret;
1434         }
1435
1436         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1437         if (res == NULL) {
1438                 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1439                 ret = -ENOENT;
1440                 goto out_error_free_peripherals;
1441         }
1442
1443         bfin_earlyprintk_port.port.membase = ioremap(res->start,
1444                                                      resource_size(res));
1445         if (!bfin_earlyprintk_port.port.membase) {
1446                 dev_err(&pdev->dev, "Cannot map uart IO\n");
1447                 ret = -ENXIO;
1448                 goto out_error_free_peripherals;
1449         }
1450         bfin_earlyprintk_port.port.mapbase = res->start;
1451         bfin_earlyprintk_port.port.line = pdev->id;
1452         bfin_earlyprintk_port.port.uartclk = get_sclk();
1453         bfin_earlyprintk_port.port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1454         spin_lock_init(&bfin_earlyprintk_port.port.lock);
1455
1456         return 0;
1457
1458 out_error_free_peripherals:
1459         peripheral_free_list(dev_get_platdata(&pdev->dev));
1460
1461         return ret;
1462 }
1463
1464 static struct platform_driver bfin_earlyprintk_driver = {
1465         .probe          = bfin_earlyprintk_probe,
1466         .driver         = {
1467                 .name   = DRIVER_NAME,
1468                 .owner  = THIS_MODULE,
1469         },
1470 };
1471
1472 static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
1473         .class_str = CLASS_BFIN_EARLYPRINTK,
1474         .pdrv = &bfin_earlyprintk_driver,
1475         .requested_id = EARLY_PLATFORM_ID_UNSET,
1476 };
1477
1478 struct console __init *bfin_earlyserial_init(unsigned int port,
1479                                                 unsigned int cflag)
1480 {
1481         struct ktermios t;
1482         char port_name[20];
1483
1484         if (port < 0 || port >= BFIN_UART_NR_PORTS)
1485                 return NULL;
1486
1487         /*
1488          * Only probe resource of the given port in earlyprintk boot arg.
1489          * The expected port id should be indicated in port name string.
1490          */
1491         snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1492         early_platform_driver_register(&early_bfin_earlyprintk_driver,
1493                 port_name);
1494         early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1495
1496         if (!bfin_earlyprintk_port.port.membase)
1497                 return NULL;
1498
1499 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1500         /*
1501          * If we are using early serial, don't let the normal console rewind
1502          * log buffer, since that causes things to be printed multiple times
1503          */
1504         bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1505 #endif
1506
1507         bfin_early_serial_console.index = port;
1508         t.c_cflag = cflag;
1509         t.c_iflag = 0;
1510         t.c_oflag = 0;
1511         t.c_lflag = ICANON;
1512         t.c_line = port;
1513         bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1514
1515         return &bfin_early_serial_console;
1516 }
1517 #endif /* CONFIG_EARLY_PRINTK */
1518
1519 static int __init bfin_serial_init(void)
1520 {
1521         int ret;
1522
1523         pr_info("Blackfin serial driver\n");
1524
1525         ret = uart_register_driver(&bfin_serial_reg);
1526         if (ret) {
1527                 pr_err("failed to register %s:%d\n",
1528                         bfin_serial_reg.driver_name, ret);
1529         }
1530
1531         ret = platform_driver_register(&bfin_serial_driver);
1532         if (ret) {
1533                 pr_err("fail to register bfin uart\n");
1534                 uart_unregister_driver(&bfin_serial_reg);
1535         }
1536
1537         return ret;
1538 }
1539
1540 static void __exit bfin_serial_exit(void)
1541 {
1542         platform_driver_unregister(&bfin_serial_driver);
1543         uart_unregister_driver(&bfin_serial_reg);
1544 }
1545
1546
1547 module_init(bfin_serial_init);
1548 module_exit(bfin_serial_exit);
1549
1550 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1551 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1552 MODULE_LICENSE("GPL");
1553 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1554 MODULE_ALIAS("platform:bfin-uart");