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(SERIAL_BFIN_CTSRTS) || \
  78         defined(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 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 u64 anomaly_start;
 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 > 0) {
 250                         u64 curr, nsecs, threshold_ns;
 251
 252                         if ((~ch & (~ch + 1)) & 0xff)
 253                                 goto known_good_char;
 254
 255                         curr = ktime_get_ns();
 256                         nsecs = curr - anomaly_start;
 257                         if (nsecs >> 32)
 258                                 goto known_good_char;
 259
 260                         threshold_ns = UART_GET_ANOMALY_THRESHOLD(uart)
 261                                                         * NSEC_PER_USEC;
 262                         if (nsecs > threshold_ns)
 263                                 goto known_good_char;
 264
 265                         if (ch)
 266                                 anomaly_start = 0;
 267                         else
 268                                 anomaly_start = curr;
 269
 270                         return;
 271
 272  known_good_char:
 273                         status &= ~BI;
 274                         anomaly_start = 0;
 275                 }
 276         }
 277
 278         if (status & BI) {
 279                 if (ANOMALY_05000363)
 280                         if (bfin_revid() < 5)
 281                                 anomaly_start = ktime_get_ns();
 282                 uart->port.icount.brk++;
 283                 if (uart_handle_break(&uart->port))
 284                         goto ignore_char;
 285                 status &= ~(PE | FE);
 286         }
 287         if (status & PE)
 288                 uart->port.icount.parity++;
 289         if (status & OE)
 290                 uart->port.icount.overrun++;
 291         if (status & FE)
 292                 uart->port.icount.frame++;
 293
 294         status &= uart->port.read_status_mask;
 295
 296         if (status & BI)
 297                 flg = TTY_BREAK;
 298         else if (status & PE)
 299                 flg = TTY_PARITY;
 300         else if (status & FE)
 301                 flg = TTY_FRAME;
 302         else
 303                 flg = TTY_NORMAL;
 304
 305         if (uart_handle_sysrq_char(&uart->port, ch))
 306                 goto ignore_char;
 307
 308         uart_insert_char(&uart->port, status, OE, ch, flg);
 309
 310  ignore_char:
 311         tty_flip_buffer_push(&uart->port.state->port);
 312 }
 313
 314 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 315 {
 316         struct circ_buf *xmit = &uart->port.state->xmit;
 317
 318         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 319 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
 320                 /* Clear TFI bit */
 321                 UART_PUT_LSR(uart, TFI);
 322 #endif
 323                 /* Anomaly notes:
 324                  *  05000215 -  we always clear ETBEI within last UART TX
 325                  *              interrupt to end a string. It is always set
 326                  *              when start a new tx.
 327                  */
 328                 UART_CLEAR_IER(uart, ETBEI);
 329                 return;
 330         }
 331
 332         if (uart->port.x_char) {
 333                 UART_PUT_CHAR(uart, uart->port.x_char);
 334                 uart->port.icount.tx++;
 335                 uart->port.x_char = 0;
 336         }
 337
 338         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 339                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 340                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 341                 uart->port.icount.tx++;
 342         }
 343
 344         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 345                 uart_write_wakeup(&uart->port);
 346 }
 347
 348 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 349 {
 350         struct bfin_serial_port *uart = dev_id;
 351
 352         while (UART_GET_LSR(uart) & DR)
 353                 bfin_serial_rx_chars(uart);
 354
 355         return IRQ_HANDLED;
 356 }
 357
 358 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 359 {
 360         struct bfin_serial_port *uart = dev_id;
 361
 362         spin_lock(&uart->port.lock);
 363         if (UART_GET_LSR(uart) & THRE)
 364                 bfin_serial_tx_chars(uart);
 365         spin_unlock(&uart->port.lock);
 366
 367         return IRQ_HANDLED;
 368 }
 369 #endif
 370
 371 #ifdef CONFIG_SERIAL_BFIN_DMA
 372 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 373 {
 374         struct circ_buf *xmit = &uart->port.state->xmit;
 375
 376         uart->tx_done = 0;
 377
 378         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 379                 uart->tx_count = 0;
 380                 uart->tx_done = 1;
 381                 return;
 382         }
 383
 384         if (uart->port.x_char) {
 385                 UART_PUT_CHAR(uart, uart->port.x_char);
 386                 uart->port.icount.tx++;
 387                 uart->port.x_char = 0;
 388         }
 389
 390         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 391         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 392                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 393         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 394                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 395         set_dma_config(uart->tx_dma_channel,
 396                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 397                         INTR_ON_BUF,
 398                         DIMENSION_LINEAR,
 399                         DATA_SIZE_8,
 400                         DMA_SYNC_RESTART));
 401         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 402         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 403         set_dma_x_modify(uart->tx_dma_channel, 1);
 404         SSYNC();
 405         enable_dma(uart->tx_dma_channel);
 406
 407         UART_SET_IER(uart, ETBEI);
 408 }
 409
 410 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 411 {
 412         int i, flg, status;
 413
 414         status = UART_GET_LSR(uart);
 415         UART_CLEAR_LSR(uart);
 416
 417         uart->port.icount.rx +=
 418                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 419                 UART_XMIT_SIZE);
 420
 421         if (status & BI) {
 422                 uart->port.icount.brk++;
 423                 if (uart_handle_break(&uart->port))
 424                         goto dma_ignore_char;
 425                 status &= ~(PE | FE);
 426         }
 427         if (status & PE)
 428                 uart->port.icount.parity++;
 429         if (status & OE)
 430                 uart->port.icount.overrun++;
 431         if (status & FE)
 432                 uart->port.icount.frame++;
 433
 434         status &= uart->port.read_status_mask;
 435
 436         if (status & BI)
 437                 flg = TTY_BREAK;
 438         else if (status & PE)
 439                 flg = TTY_PARITY;
 440         else if (status & FE)
 441                 flg = TTY_FRAME;
 442         else
 443                 flg = TTY_NORMAL;
 444
 445         for (i = uart->rx_dma_buf.tail; ; i++) {
 446                 if (i >= UART_XMIT_SIZE)
 447                         i = 0;
 448                 if (i == uart->rx_dma_buf.head)
 449                         break;
 450                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 451                         uart_insert_char(&uart->port, status, OE,
 452                                 uart->rx_dma_buf.buf[i], flg);
 453         }
 454
 455  dma_ignore_char:
 456         tty_flip_buffer_push(&uart->port.state->port);
 457 }
 458
 459 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 460 {
 461         int x_pos, pos;
 462         unsigned long flags;
 463
 464         dma_disable_irq_nosync(uart->rx_dma_channel);
 465         spin_lock_irqsave(&uart->rx_lock, flags);
 466
 467         /* 2D DMA RX buffer ring is used. Because curr_y_count and
 468          * curr_x_count can't be read as an atomic operation,
 469          * curr_y_count should be read before curr_x_count. When
 470          * curr_x_count is read, curr_y_count may already indicate
 471          * next buffer line. But, the position calculated here is
 472          * still indicate the old line. The wrong position data may
 473          * be smaller than current buffer tail, which cause garbages
 474          * are received if it is not prohibit.
 475          */
 476         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 477         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 478         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 479         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
 480                 uart->rx_dma_nrows = 0;
 481         x_pos = DMA_RX_XCOUNT - x_pos;
 482         if (x_pos == DMA_RX_XCOUNT)
 483                 x_pos = 0;
 484
 485         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 486         /* Ignore receiving data if new position is in the same line of
 487          * current buffer tail and small.
 488          */
 489         if (pos > uart->rx_dma_buf.tail ||
 490                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
 491                 uart->rx_dma_buf.head = pos;
 492                 bfin_serial_dma_rx_chars(uart);
 493                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 494         }
 495
 496         spin_unlock_irqrestore(&uart->rx_lock, flags);
 497         dma_enable_irq(uart->rx_dma_channel);
 498
 499         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 500 }
 501
 502 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 503 {
 504         struct bfin_serial_port *uart = dev_id;
 505         struct circ_buf *xmit = &uart->port.state->xmit;
 506
 507         spin_lock(&uart->port.lock);
 508         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 509                 disable_dma(uart->tx_dma_channel);
 510                 clear_dma_irqstat(uart->tx_dma_channel);
 511                 /* Anomaly notes:
 512                  *  05000215 -  we always clear ETBEI within last UART TX
 513                  *              interrupt to end a string. It is always set
 514                  *              when start a new tx.
 515                  */
 516                 UART_CLEAR_IER(uart, ETBEI);
 517                 uart->port.icount.tx += uart->tx_count;
 518                 if (!(xmit->tail == 0 && xmit->head == 0)) {
 519                         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 520
 521                         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 522                                 uart_write_wakeup(&uart->port);
 523                 }
 524
 525                 bfin_serial_dma_tx_chars(uart);
 526         }
 527
 528         spin_unlock(&uart->port.lock);
 529         return IRQ_HANDLED;
 530 }
 531
 532 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 533 {
 534         struct bfin_serial_port *uart = dev_id;
 535         unsigned int irqstat;
 536         int x_pos, pos;
 537
 538         spin_lock(&uart->rx_lock);
 539         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 540         clear_dma_irqstat(uart->rx_dma_channel);
 541
 542         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 543         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 544         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 545         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
 546                 uart->rx_dma_nrows = 0;
 547
 548         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
 549         if (pos > uart->rx_dma_buf.tail ||
 550                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
 551                 uart->rx_dma_buf.head = pos;
 552                 bfin_serial_dma_rx_chars(uart);
 553                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 554         }
 555
 556         spin_unlock(&uart->rx_lock);
 557
 558         return IRQ_HANDLED;
 559 }
 560 #endif
 561
 562 /*
 563  * Return TIOCSER_TEMT when transmitter is not busy.
 564  */
 565 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 566 {
 567         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 568         unsigned int lsr;
 569
 570         lsr = UART_GET_LSR(uart);
 571         if (lsr & TEMT)
 572                 return TIOCSER_TEMT;
 573         else
 574                 return 0;
 575 }
 576
 577 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 578 {
 579         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 580         u32 lcr = UART_GET_LCR(uart);
 581         if (break_state)
 582                 lcr |= SB;
 583         else
 584                 lcr &= ~SB;
 585         UART_PUT_LCR(uart, lcr);
 586         SSYNC();
 587 }
 588
 589 static int bfin_serial_startup(struct uart_port *port)
 590 {
 591         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 592
 593 #ifdef CONFIG_SERIAL_BFIN_DMA
 594         dma_addr_t dma_handle;
 595
 596         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 597                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 598                 return -EBUSY;
 599         }
 600
 601         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 602                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 603                 free_dma(uart->rx_dma_channel);
 604                 return -EBUSY;
 605         }
 606
 607         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 608         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 609
 610         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 611         uart->rx_dma_buf.head = 0;
 612         uart->rx_dma_buf.tail = 0;
 613         uart->rx_dma_nrows = 0;
 614
 615         set_dma_config(uart->rx_dma_channel,
 616                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 617                                 INTR_ON_ROW, DIMENSION_2D,
 618                                 DATA_SIZE_8,
 619                                 DMA_SYNC_RESTART));
 620         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 621         set_dma_x_modify(uart->rx_dma_channel, 1);
 622         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 623         set_dma_y_modify(uart->rx_dma_channel, 1);
 624         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 625         enable_dma(uart->rx_dma_channel);
 626
 627         uart->rx_dma_timer.data = (unsigned long)(uart);
 628         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 629         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 630         add_timer(&(uart->rx_dma_timer));
 631 #else
 632 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 633         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 634         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 635                 kgdboc_break_enabled = 0;
 636         else {
 637 # endif
 638         if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
 639              "BFIN_UART_RX", uart)) {
 640                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 641                 return -EBUSY;
 642         }
 643
 644         if (request_irq
 645             (uart->tx_irq, bfin_serial_tx_int, 0,
 646              "BFIN_UART_TX", uart)) {
 647                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 648                 free_irq(uart->rx_irq, uart);
 649                 return -EBUSY;
 650         }
 651
 652 # ifdef CONFIG_BF54x
 653         {
 654                 /*
 655                  * UART2 and UART3 on BF548 share interrupt PINs and DMA
 656                  * controllers with SPORT2 and SPORT3. UART rx and tx
 657                  * interrupts are generated in PIO mode only when configure
 658                  * their peripheral mapping registers properly, which means
 659                  * request corresponding DMA channels in PIO mode as well.
 660                  */
 661                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 662
 663                 switch (uart->rx_irq) {
 664                 case IRQ_UART3_RX:
 665                         uart_dma_ch_rx = CH_UART3_RX;
 666                         uart_dma_ch_tx = CH_UART3_TX;
 667                         break;
 668                 case IRQ_UART2_RX:
 669                         uart_dma_ch_rx = CH_UART2_RX;
 670                         uart_dma_ch_tx = CH_UART2_TX;
 671                         break;
 672                 default:
 673                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
 674                         break;
 675                 }
 676
 677                 if (uart_dma_ch_rx &&
 678                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 679                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
 680                         free_irq(uart->rx_irq, uart);
 681                         free_irq(uart->tx_irq, uart);
 682                         return -EBUSY;
 683                 }
 684                 if (uart_dma_ch_tx &&
 685                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 686                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 687                         free_dma(uart_dma_ch_rx);
 688                         free_irq(uart->rx_irq, uart);
 689                         free_irq(uart->tx_irq, uart);
 690                         return -EBUSY;
 691                 }
 692         }
 693 # endif
 694 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 695         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 696         }
 697 # endif
 698 #endif
 699
 700 #ifdef SERIAL_BFIN_CTSRTS
 701         if (uart->cts_pin >= 0) {
 702                 if (request_irq(gpio_to_irq(uart->cts_pin),
 703                         bfin_serial_mctrl_cts_int,
 704                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 705                         0, "BFIN_UART_CTS", uart)) {
 706                         uart->cts_pin = -1;
 707                         pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
 708                 }
 709         }
 710         if (uart->rts_pin >= 0) {
 711                 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
 712                         pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
 713                         uart->rts_pin = -1;
 714                 } else
 715                         gpio_direction_output(uart->rts_pin, 0);
 716         }
 717 #endif
 718 #ifdef SERIAL_BFIN_HARD_CTSRTS
 719         if (uart->cts_pin >= 0) {
 720                 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
 721                         0, "BFIN_UART_MODEM_STATUS", uart)) {
 722                         uart->cts_pin = -1;
 723                         dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
 724                 }
 725
 726                 /* CTS RTS PINs are negative assertive. */
 727                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
 728                 UART_SET_IER(uart, EDSSI);
 729         }
 730 #endif
 731
 732         UART_SET_IER(uart, ERBFI);
 733         return 0;
 734 }
 735
 736 static void bfin_serial_shutdown(struct uart_port *port)
 737 {
 738         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 739
 740 #ifdef CONFIG_SERIAL_BFIN_DMA
 741         disable_dma(uart->tx_dma_channel);
 742         free_dma(uart->tx_dma_channel);
 743         disable_dma(uart->rx_dma_channel);
 744         free_dma(uart->rx_dma_channel);
 745         del_timer(&(uart->rx_dma_timer));
 746         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 747 #else
 748 #ifdef CONFIG_BF54x
 749         switch (uart->port.irq) {
 750         case IRQ_UART3_RX:
 751                 free_dma(CH_UART3_RX);
 752                 free_dma(CH_UART3_TX);
 753                 break;
 754         case IRQ_UART2_RX:
 755                 free_dma(CH_UART2_RX);
 756                 free_dma(CH_UART2_TX);
 757                 break;
 758         default:
 759                 break;
 760         }
 761 #endif
 762         free_irq(uart->rx_irq, uart);
 763         free_irq(uart->tx_irq, uart);
 764 #endif
 765
 766 #ifdef SERIAL_BFIN_CTSRTS
 767         if (uart->cts_pin >= 0)
 768                 free_irq(gpio_to_irq(uart->cts_pin), uart);
 769         if (uart->rts_pin >= 0)
 770                 gpio_free(uart->rts_pin);
 771 #endif
 772 #ifdef SERIAL_BFIN_HARD_CTSRTS
 773         if (uart->cts_pin >= 0)
 774                 free_irq(uart->status_irq, uart);
 775 #endif
 776 }
 777
 778 static void
 779 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 780                    struct ktermios *old)
 781 {
 782         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 783         unsigned long flags;
 784         unsigned int baud, quot;
 785         unsigned int ier, lcr = 0;
 786         unsigned long timeout;
 787
 788 #ifdef SERIAL_BFIN_CTSRTS
 789         if (old == NULL && uart->cts_pin != -1)
 790                 termios->c_cflag |= CRTSCTS;
 791         else if (uart->cts_pin == -1)
 792                 termios->c_cflag &= ~CRTSCTS;
 793 #endif
 794
 795         switch (termios->c_cflag & CSIZE) {
 796         case CS8:
 797                 lcr = WLS(8);
 798                 break;
 799         case CS7:
 800                 lcr = WLS(7);
 801                 break;
 802         case CS6:
 803                 lcr = WLS(6);
 804                 break;
 805         case CS5:
 806                 lcr = WLS(5);
 807                 break;
 808         default:
 809                 printk(KERN_ERR "%s: word length not supported\n",
 810                         __func__);
 811         }
 812
 813         /* Anomaly notes:
 814          *  05000231 -  STOP bit is always set to 1 whatever the user is set.
 815          */
 816         if (termios->c_cflag & CSTOPB) {
 817                 if (ANOMALY_05000231)
 818                         printk(KERN_WARNING "STOP bits other than 1 is not "
 819                                 "supported in case of anomaly 05000231.\n");
 820                 else
 821                         lcr |= STB;
 822         }
 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         spin_lock_irqsave(&uart->port.lock, flags);
 831
 832         port->read_status_mask = OE;
 833         if (termios->c_iflag & INPCK)
 834                 port->read_status_mask |= (FE | PE);
 835         if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
 836                 port->read_status_mask |= BI;
 837
 838         /*
 839          * Characters to ignore
 840          */
 841         port->ignore_status_mask = 0;
 842         if (termios->c_iflag & IGNPAR)
 843                 port->ignore_status_mask |= FE | PE;
 844         if (termios->c_iflag & IGNBRK) {
 845                 port->ignore_status_mask |= BI;
 846                 /*
 847                  * If we're ignoring parity and break indicators,
 848                  * ignore overruns too (for real raw support).
 849                  */
 850                 if (termios->c_iflag & IGNPAR)
 851                         port->ignore_status_mask |= OE;
 852         }
 853
 854         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 855         quot = uart_get_divisor(port, baud);
 856
 857         /* If discipline is not IRDA, apply ANOMALY_05000230 */
 858         if (termios->c_line != N_IRDA)
 859                 quot -= ANOMALY_05000230;
 860
 861         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 862
 863         /* Wait till the transfer buffer is empty */
 864         timeout = jiffies + msecs_to_jiffies(10);
 865         while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
 866                 if (time_after(jiffies, timeout)) {
 867                         dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
 868                         break;
 869                 }
 870
 871         /* Disable UART */
 872         ier = UART_GET_IER(uart);
 873         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
 874         UART_DISABLE_INTS(uart);
 875
 876         /* Set DLAB in LCR to Access CLK */
 877         UART_SET_DLAB(uart);
 878
 879         UART_PUT_CLK(uart, quot);
 880         SSYNC();
 881
 882         /* Clear DLAB in LCR to Access THR RBR IER */
 883         UART_CLEAR_DLAB(uart);
 884
 885         UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
 886
 887         /* Enable UART */
 888         UART_ENABLE_INTS(uart, ier);
 889         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
 890
 891         /* Port speed changed, update the per-port timeout. */
 892         uart_update_timeout(port, termios->c_cflag, baud);
 893
 894         spin_unlock_irqrestore(&uart->port.lock, flags);
 895 }
 896
 897 static const char *bfin_serial_type(struct uart_port *port)
 898 {
 899         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 900
 901         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 902 }
 903
 904 /*
 905  * Release the memory region(s) being used by 'port'.
 906  */
 907 static void bfin_serial_release_port(struct uart_port *port)
 908 {
 909 }
 910
 911 /*
 912  * Request the memory region(s) being used by 'port'.
 913  */
 914 static int bfin_serial_request_port(struct uart_port *port)
 915 {
 916         return 0;
 917 }
 918
 919 /*
 920  * Configure/autoconfigure the port.
 921  */
 922 static void bfin_serial_config_port(struct uart_port *port, int flags)
 923 {
 924         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 925
 926         if (flags & UART_CONFIG_TYPE &&
 927             bfin_serial_request_port(&uart->port) == 0)
 928                 uart->port.type = PORT_BFIN;
 929 }
 930
 931 /*
 932  * Verify the new serial_struct (for TIOCSSERIAL).
 933  * The only change we allow are to the flags and type, and
 934  * even then only between PORT_BFIN and PORT_UNKNOWN
 935  */
 936 static int
 937 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 938 {
 939         return 0;
 940 }
 941
 942 /*
 943  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 944  * In other cases, disable IrDA function.
 945  */
 946 static void bfin_serial_set_ldisc(struct uart_port *port,
 947                                   struct ktermios *termios)
 948 {
 949         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 950         unsigned int val;
 951
 952         switch (termios->c_line) {
 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(SERIAL_BFIN_CTSRTS) || \
1111         defined(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(SERIAL_BFIN_CTSRTS) || \
1323         defined(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         },
1390 };
1391
1392 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1393 static struct early_platform_driver early_bfin_serial_driver __initdata = {
1394         .class_str = CLASS_BFIN_CONSOLE,
1395         .pdrv = &bfin_serial_driver,
1396         .requested_id = EARLY_PLATFORM_ID_UNSET,
1397 };
1398
1399 static int __init bfin_serial_rs_console_init(void)
1400 {
1401         early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1402
1403         early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1404
1405         register_console(&bfin_serial_console);
1406
1407         return 0;
1408 }
1409 console_initcall(bfin_serial_rs_console_init);
1410 #endif
1411
1412 #ifdef CONFIG_EARLY_PRINTK
1413 /*
1414  * Memory can't be allocated dynamically during earlyprink init stage.
1415  * So, do individual probe for earlyprink with a static uart port variable.
1416  */
1417 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1418 {
1419         struct resource *res;
1420         int ret;
1421
1422         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1423                 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1424                 return -ENOENT;
1425         }
1426
1427         ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
1428                                         DRIVER_NAME);
1429         if (ret) {
1430                 dev_err(&pdev->dev,
1431                                 "fail to request bfin serial peripherals\n");
1432                         return ret;
1433         }
1434
1435         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1436         if (res == NULL) {
1437                 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1438                 ret = -ENOENT;
1439                 goto out_error_free_peripherals;
1440         }
1441
1442         bfin_earlyprintk_port.port.membase = ioremap(res->start,
1443                                                      resource_size(res));
1444         if (!bfin_earlyprintk_port.port.membase) {
1445                 dev_err(&pdev->dev, "Cannot map uart IO\n");
1446                 ret = -ENXIO;
1447                 goto out_error_free_peripherals;
1448         }
1449         bfin_earlyprintk_port.port.mapbase = res->start;
1450         bfin_earlyprintk_port.port.line = pdev->id;
1451         bfin_earlyprintk_port.port.uartclk = get_sclk();
1452         bfin_earlyprintk_port.port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1453         spin_lock_init(&bfin_earlyprintk_port.port.lock);
1454
1455         return 0;
1456
1457 out_error_free_peripherals:
1458         peripheral_free_list(dev_get_platdata(&pdev->dev));
1459
1460         return ret;
1461 }
1462
1463 static struct platform_driver bfin_earlyprintk_driver = {
1464         .probe          = bfin_earlyprintk_probe,
1465         .driver         = {
1466                 .name   = DRIVER_NAME,
1467                 .owner  = THIS_MODULE,
1468         },
1469 };
1470
1471 static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
1472         .class_str = CLASS_BFIN_EARLYPRINTK,
1473         .pdrv = &bfin_earlyprintk_driver,
1474         .requested_id = EARLY_PLATFORM_ID_UNSET,
1475 };
1476
1477 struct console __init *bfin_earlyserial_init(unsigned int port,
1478                                                 unsigned int cflag)
1479 {
1480         struct ktermios t;
1481         char port_name[20];
1482
1483         if (port < 0 || port >= BFIN_UART_NR_PORTS)
1484                 return NULL;
1485
1486         /*
1487          * Only probe resource of the given port in earlyprintk boot arg.
1488          * The expected port id should be indicated in port name string.
1489          */
1490         snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1491         early_platform_driver_register(&early_bfin_earlyprintk_driver,
1492                 port_name);
1493         early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1494
1495         if (!bfin_earlyprintk_port.port.membase)
1496                 return NULL;
1497
1498 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1499         /*
1500          * If we are using early serial, don't let the normal console rewind
1501          * log buffer, since that causes things to be printed multiple times
1502          */
1503         bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1504 #endif
1505
1506         bfin_early_serial_console.index = port;
1507         t.c_cflag = cflag;
1508         t.c_iflag = 0;
1509         t.c_oflag = 0;
1510         t.c_lflag = ICANON;
1511         t.c_line = port;
1512         bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1513
1514         return &bfin_early_serial_console;
1515 }
1516 #endif /* CONFIG_EARLY_PRINTK */
1517
1518 static int __init bfin_serial_init(void)
1519 {
1520         int ret;
1521
1522         pr_info("Blackfin serial driver\n");
1523
1524         ret = uart_register_driver(&bfin_serial_reg);
1525         if (ret) {
1526                 pr_err("failed to register %s:%d\n",
1527                         bfin_serial_reg.driver_name, ret);
1528         }
1529
1530         ret = platform_driver_register(&bfin_serial_driver);
1531         if (ret) {
1532                 pr_err("fail to register bfin uart\n");
1533                 uart_unregister_driver(&bfin_serial_reg);
1534         }
1535
1536         return ret;
1537 }
1538
1539 static void __exit bfin_serial_exit(void)
1540 {
1541         platform_driver_unregister(&bfin_serial_driver);
1542         uart_unregister_driver(&bfin_serial_reg);
1543 }
1544
1545
1546 module_init(bfin_serial_init);
1547 module_exit(bfin_serial_exit);
1548
1549 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1550 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1551 MODULE_LICENSE("GPL");
1552 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1553 MODULE_ALIAS("platform:bfin-uart");