drivers/tty/serial/bfin_uart.c

   1 /*
   2  * Blackfin On-Chip Serial Driver
   3  *
   4  * Copyright 2006-2010 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
  39 #define port_membase(uart)     (((struct bfin_serial_port *)(uart))->port.membase)
  40 #define get_lsr_cache(uart)    (((struct bfin_serial_port *)(uart))->lsr)
  41 #define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v))
  42 #include <asm/bfin_serial.h>
  43
  44 #ifdef CONFIG_SERIAL_BFIN_MODULE
  45 # undef CONFIG_EARLY_PRINTK
  46 #endif
  47
  48 #ifdef CONFIG_SERIAL_BFIN_MODULE
  49 # undef CONFIG_EARLY_PRINTK
  50 #endif
  51
  52 /* UART name and device definitions */
  53 #define BFIN_SERIAL_DEV_NAME    "ttyBF"
  54 #define BFIN_SERIAL_MAJOR       204
  55 #define BFIN_SERIAL_MINOR       64
  56
  57 static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
  58
  59 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
  60         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
  61
  62 # ifndef CONFIG_SERIAL_BFIN_PIO
  63 #  error KGDB only support UART in PIO mode.
  64 # endif
  65
  66 static int kgdboc_port_line;
  67 static int kgdboc_break_enabled;
  68 #endif
  69 /*
  70  * Setup for console. Argument comes from the menuconfig
  71  */
  72 #define DMA_RX_XCOUNT           512
  73 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  74
  75 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
  76
  77 #ifdef CONFIG_SERIAL_BFIN_DMA
  78 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  79 #else
  80 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  81 #endif
  82
  83 static void bfin_serial_reset_irda(struct uart_port *port);
  84
  85 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
  86         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
  87 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
  88 {
  89         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  90         if (uart->cts_pin < 0)
  91                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
  92
  93         /* CTS PIN is negative assertive. */
  94         if (UART_GET_CTS(uart))
  95                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
  96         else
  97                 return TIOCM_DSR | TIOCM_CAR;
  98 }
  99
 100 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 101 {
 102         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 103         if (uart->rts_pin < 0)
 104                 return;
 105
 106         /* RTS PIN is negative assertive. */
 107         if (mctrl & TIOCM_RTS)
 108                 UART_ENABLE_RTS(uart);
 109         else
 110                 UART_DISABLE_RTS(uart);
 111 }
 112
 113 /*
 114  * Handle any change of modem status signal.
 115  */
 116 static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
 117 {
 118         struct bfin_serial_port *uart = dev_id;
 119         unsigned int status = bfin_serial_get_mctrl(&uart->port);
 120 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 121         struct tty_struct *tty = uart->port.state->port.tty;
 122
 123         UART_CLEAR_SCTS(uart);
 124         if (tty->hw_stopped) {
 125                 if (status) {
 126                         tty->hw_stopped = 0;
 127                         uart_write_wakeup(&uart->port);
 128                 }
 129         } else {
 130                 if (!status)
 131                         tty->hw_stopped = 1;
 132         }
 133 #endif
 134         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 135
 136         return IRQ_HANDLED;
 137 }
 138 #else
 139 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 140 {
 141         return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 142 }
 143
 144 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 145 {
 146 }
 147 #endif
 148
 149 /*
 150  * interrupts are disabled on entry
 151  */
 152 static void bfin_serial_stop_tx(struct uart_port *port)
 153 {
 154         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 155 #ifdef CONFIG_SERIAL_BFIN_DMA
 156         struct circ_buf *xmit = &uart->port.state->xmit;
 157 #endif
 158
 159         while (!(UART_GET_LSR(uart) & TEMT))
 160                 cpu_relax();
 161
 162 #ifdef CONFIG_SERIAL_BFIN_DMA
 163         disable_dma(uart->tx_dma_channel);
 164         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 165         uart->port.icount.tx += uart->tx_count;
 166         uart->tx_count = 0;
 167         uart->tx_done = 1;
 168 #else
 169 #ifdef CONFIG_BF54x
 170         /* Clear TFI bit */
 171         UART_PUT_LSR(uart, TFI);
 172 #endif
 173         UART_CLEAR_IER(uart, ETBEI);
 174 #endif
 175 }
 176
 177 /*
 178  * port is locked and interrupts are disabled
 179  */
 180 static void bfin_serial_start_tx(struct uart_port *port)
 181 {
 182         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 183         struct tty_struct *tty = uart->port.state->port.tty;
 184
 185         /*
 186          * To avoid losting RX interrupt, we reset IR function
 187          * before sending data.
 188          */
 189         if (tty->termios->c_line == N_IRDA)
 190                 bfin_serial_reset_irda(port);
 191
 192 #ifdef CONFIG_SERIAL_BFIN_DMA
 193         if (uart->tx_done)
 194                 bfin_serial_dma_tx_chars(uart);
 195 #else
 196         UART_SET_IER(uart, ETBEI);
 197         bfin_serial_tx_chars(uart);
 198 #endif
 199 }
 200
 201 /*
 202  * Interrupts are enabled
 203  */
 204 static void bfin_serial_stop_rx(struct uart_port *port)
 205 {
 206         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 207
 208         UART_CLEAR_IER(uart, ERBFI);
 209 }
 210
 211 /*
 212  * Set the modem control timer to fire immediately.
 213  */
 214 static void bfin_serial_enable_ms(struct uart_port *port)
 215 {
 216 }
 217
 218
 219 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
 220 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 221 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
 222 #else
 223 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
 224 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
 225 #endif
 226
 227 #ifdef CONFIG_SERIAL_BFIN_PIO
 228 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 229 {
 230         struct tty_struct *tty = NULL;
 231         unsigned int status, ch, flg;
 232         static struct timeval anomaly_start = { .tv_sec = 0 };
 233
 234         status = UART_GET_LSR(uart);
 235         UART_CLEAR_LSR(uart);
 236
 237         ch = UART_GET_CHAR(uart);
 238         uart->port.icount.rx++;
 239
 240 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 241         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 242         if (kgdb_connected && kgdboc_port_line == uart->port.line
 243                 && kgdboc_break_enabled)
 244                 if (ch == 0x3) {/* Ctrl + C */
 245                         kgdb_breakpoint();
 246                         return;
 247                 }
 248
 249         if (!uart->port.state || !uart->port.state->port.tty)
 250                 return;
 251 #endif
 252         tty = uart->port.state->port.tty;
 253
 254         if (ANOMALY_05000363) {
 255                 /* The BF533 (and BF561) family of processors have a nice anomaly
 256                  * where they continuously generate characters for a "single" break.
 257                  * We have to basically ignore this flood until the "next" valid
 258                  * character comes across.  Due to the nature of the flood, it is
 259                  * not possible to reliably catch bytes that are sent too quickly
 260                  * after this break.  So application code talking to the Blackfin
 261                  * which sends a break signal must allow at least 1.5 character
 262                  * times after the end of the break for things to stabilize.  This
 263                  * timeout was picked as it must absolutely be larger than 1
 264                  * character time +/- some percent.  So 1.5 sounds good.  All other
 265                  * Blackfin families operate properly.  Woo.
 266                  */
 267                 if (anomaly_start.tv_sec) {
 268                         struct timeval curr;
 269                         suseconds_t usecs;
 270
 271                         if ((~ch & (~ch + 1)) & 0xff)
 272                                 goto known_good_char;
 273
 274                         do_gettimeofday(&curr);
 275                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
 276                                 goto known_good_char;
 277
 278                         usecs = 0;
 279                         if (curr.tv_sec != anomaly_start.tv_sec)
 280                                 usecs += USEC_PER_SEC;
 281                         usecs += curr.tv_usec - anomaly_start.tv_usec;
 282
 283                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
 284                                 goto known_good_char;
 285
 286                         if (ch)
 287                                 anomaly_start.tv_sec = 0;
 288                         else
 289                                 anomaly_start = curr;
 290
 291                         return;
 292
 293  known_good_char:
 294                         status &= ~BI;
 295                         anomaly_start.tv_sec = 0;
 296                 }
 297         }
 298
 299         if (status & BI) {
 300                 if (ANOMALY_05000363)
 301                         if (bfin_revid() < 5)
 302                                 do_gettimeofday(&anomaly_start);
 303                 uart->port.icount.brk++;
 304                 if (uart_handle_break(&uart->port))
 305                         goto ignore_char;
 306                 status &= ~(PE | FE);
 307         }
 308         if (status & PE)
 309                 uart->port.icount.parity++;
 310         if (status & OE)
 311                 uart->port.icount.overrun++;
 312         if (status & FE)
 313                 uart->port.icount.frame++;
 314
 315         status &= uart->port.read_status_mask;
 316
 317         if (status & BI)
 318                 flg = TTY_BREAK;
 319         else if (status & PE)
 320                 flg = TTY_PARITY;
 321         else if (status & FE)
 322                 flg = TTY_FRAME;
 323         else
 324                 flg = TTY_NORMAL;
 325
 326         if (uart_handle_sysrq_char(&uart->port, ch))
 327                 goto ignore_char;
 328
 329         uart_insert_char(&uart->port, status, OE, ch, flg);
 330
 331  ignore_char:
 332         tty_flip_buffer_push(tty);
 333 }
 334
 335 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 336 {
 337         struct circ_buf *xmit = &uart->port.state->xmit;
 338
 339         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 340 #ifdef CONFIG_BF54x
 341                 /* Clear TFI bit */
 342                 UART_PUT_LSR(uart, TFI);
 343 #endif
 344                 /* Anomaly notes:
 345                  *  05000215 -  we always clear ETBEI within last UART TX
 346                  *              interrupt to end a string. It is always set
 347                  *              when start a new tx.
 348                  */
 349                 UART_CLEAR_IER(uart, ETBEI);
 350                 return;
 351         }
 352
 353         if (uart->port.x_char) {
 354                 UART_PUT_CHAR(uart, uart->port.x_char);
 355                 uart->port.icount.tx++;
 356                 uart->port.x_char = 0;
 357         }
 358
 359         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
 360                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
 361                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 362                 uart->port.icount.tx++;
 363         }
 364
 365         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 366                 uart_write_wakeup(&uart->port);
 367 }
 368
 369 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 370 {
 371         struct bfin_serial_port *uart = dev_id;
 372
 373         while (UART_GET_LSR(uart) & DR)
 374                 bfin_serial_rx_chars(uart);
 375
 376         return IRQ_HANDLED;
 377 }
 378
 379 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 380 {
 381         struct bfin_serial_port *uart = dev_id;
 382
 383         spin_lock(&uart->port.lock);
 384         if (UART_GET_LSR(uart) & THRE)
 385                 bfin_serial_tx_chars(uart);
 386         spin_unlock(&uart->port.lock);
 387
 388         return IRQ_HANDLED;
 389 }
 390 #endif
 391
 392 #ifdef CONFIG_SERIAL_BFIN_DMA
 393 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 394 {
 395         struct circ_buf *xmit = &uart->port.state->xmit;
 396
 397         uart->tx_done = 0;
 398
 399         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 400                 uart->tx_count = 0;
 401                 uart->tx_done = 1;
 402                 return;
 403         }
 404
 405         if (uart->port.x_char) {
 406                 UART_PUT_CHAR(uart, uart->port.x_char);
 407                 uart->port.icount.tx++;
 408                 uart->port.x_char = 0;
 409         }
 410
 411         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 412         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 413                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 414         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 415                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 416         set_dma_config(uart->tx_dma_channel,
 417                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 418                         INTR_ON_BUF,
 419                         DIMENSION_LINEAR,
 420                         DATA_SIZE_8,
 421                         DMA_SYNC_RESTART));
 422         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 423         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 424         set_dma_x_modify(uart->tx_dma_channel, 1);
 425         SSYNC();
 426         enable_dma(uart->tx_dma_channel);
 427
 428         UART_SET_IER(uart, ETBEI);
 429 }
 430
 431 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 432 {
 433         struct tty_struct *tty = uart->port.state->port.tty;
 434         int i, flg, status;
 435
 436         status = UART_GET_LSR(uart);
 437         UART_CLEAR_LSR(uart);
 438
 439         uart->port.icount.rx +=
 440                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
 441                 UART_XMIT_SIZE);
 442
 443         if (status & BI) {
 444                 uart->port.icount.brk++;
 445                 if (uart_handle_break(&uart->port))
 446                         goto dma_ignore_char;
 447                 status &= ~(PE | FE);
 448         }
 449         if (status & PE)
 450                 uart->port.icount.parity++;
 451         if (status & OE)
 452                 uart->port.icount.overrun++;
 453         if (status & FE)
 454                 uart->port.icount.frame++;
 455
 456         status &= uart->port.read_status_mask;
 457
 458         if (status & BI)
 459                 flg = TTY_BREAK;
 460         else if (status & PE)
 461                 flg = TTY_PARITY;
 462         else if (status & FE)
 463                 flg = TTY_FRAME;
 464         else
 465                 flg = TTY_NORMAL;
 466
 467         for (i = uart->rx_dma_buf.tail; ; i++) {
 468                 if (i >= UART_XMIT_SIZE)
 469                         i = 0;
 470                 if (i == uart->rx_dma_buf.head)
 471                         break;
 472                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 473                         uart_insert_char(&uart->port, status, OE,
 474                                 uart->rx_dma_buf.buf[i], flg);
 475         }
 476
 477  dma_ignore_char:
 478         tty_flip_buffer_push(tty);
 479 }
 480
 481 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 482 {
 483         int x_pos, pos;
 484
 485         dma_disable_irq_nosync(uart->rx_dma_channel);
 486         spin_lock_bh(&uart->rx_lock);
 487
 488         /* 2D DMA RX buffer ring is used. Because curr_y_count and
 489          * curr_x_count can't be read as an atomic operation,
 490          * curr_y_count should be read before curr_x_count. When
 491          * curr_x_count is read, curr_y_count may already indicate
 492          * next buffer line. But, the position calculated here is
 493          * still indicate the old line. The wrong position data may
 494          * be smaller than current buffer tail, which cause garbages
 495          * are received if it is not prohibit.
 496          */
 497         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 498         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 499         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 500         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
 501                 uart->rx_dma_nrows = 0;
 502         x_pos = DMA_RX_XCOUNT - x_pos;
 503         if (x_pos == DMA_RX_XCOUNT)
 504                 x_pos = 0;
 505
 506         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 507         /* Ignore receiving data if new position is in the same line of
 508          * current buffer tail and small.
 509          */
 510         if (pos > uart->rx_dma_buf.tail ||
 511                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
 512                 uart->rx_dma_buf.head = pos;
 513                 bfin_serial_dma_rx_chars(uart);
 514                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 515         }
 516
 517         spin_unlock_bh(&uart->rx_lock);
 518         dma_enable_irq(uart->rx_dma_channel);
 519
 520         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 521 }
 522
 523 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 524 {
 525         struct bfin_serial_port *uart = dev_id;
 526         struct circ_buf *xmit = &uart->port.state->xmit;
 527
 528         spin_lock(&uart->port.lock);
 529         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 530                 disable_dma(uart->tx_dma_channel);
 531                 clear_dma_irqstat(uart->tx_dma_channel);
 532                 /* Anomaly notes:
 533                  *  05000215 -  we always clear ETBEI within last UART TX
 534                  *              interrupt to end a string. It is always set
 535                  *              when start a new tx.
 536                  */
 537                 UART_CLEAR_IER(uart, ETBEI);
 538                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 539                 uart->port.icount.tx += uart->tx_count;
 540
 541                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 542                         uart_write_wakeup(&uart->port);
 543
 544                 bfin_serial_dma_tx_chars(uart);
 545         }
 546
 547         spin_unlock(&uart->port.lock);
 548         return IRQ_HANDLED;
 549 }
 550
 551 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 552 {
 553         struct bfin_serial_port *uart = dev_id;
 554         unsigned short irqstat;
 555         int x_pos, pos;
 556
 557         spin_lock(&uart->rx_lock);
 558         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 559         clear_dma_irqstat(uart->rx_dma_channel);
 560
 561         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
 562         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
 563         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
 564         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
 565                 uart->rx_dma_nrows = 0;
 566
 567         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
 568         if (pos > uart->rx_dma_buf.tail ||
 569                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
 570                 uart->rx_dma_buf.head = pos;
 571                 bfin_serial_dma_rx_chars(uart);
 572                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
 573         }
 574
 575         spin_unlock(&uart->rx_lock);
 576
 577         return IRQ_HANDLED;
 578 }
 579 #endif
 580
 581 /*
 582  * Return TIOCSER_TEMT when transmitter is not busy.
 583  */
 584 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 585 {
 586         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 587         unsigned short lsr;
 588
 589         lsr = UART_GET_LSR(uart);
 590         if (lsr & TEMT)
 591                 return TIOCSER_TEMT;
 592         else
 593                 return 0;
 594 }
 595
 596 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 597 {
 598         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 599         u16 lcr = UART_GET_LCR(uart);
 600         if (break_state)
 601                 lcr |= SB;
 602         else
 603                 lcr &= ~SB;
 604         UART_PUT_LCR(uart, lcr);
 605         SSYNC();
 606 }
 607
 608 static int bfin_serial_startup(struct uart_port *port)
 609 {
 610         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 611
 612 #ifdef CONFIG_SERIAL_BFIN_DMA
 613         dma_addr_t dma_handle;
 614
 615         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 616                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 617                 return -EBUSY;
 618         }
 619
 620         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 621                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 622                 free_dma(uart->rx_dma_channel);
 623                 return -EBUSY;
 624         }
 625
 626         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 627         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 628
 629         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 630         uart->rx_dma_buf.head = 0;
 631         uart->rx_dma_buf.tail = 0;
 632         uart->rx_dma_nrows = 0;
 633
 634         set_dma_config(uart->rx_dma_channel,
 635                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 636                                 INTR_ON_ROW, DIMENSION_2D,
 637                                 DATA_SIZE_8,
 638                                 DMA_SYNC_RESTART));
 639         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 640         set_dma_x_modify(uart->rx_dma_channel, 1);
 641         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 642         set_dma_y_modify(uart->rx_dma_channel, 1);
 643         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 644         enable_dma(uart->rx_dma_channel);
 645
 646         uart->rx_dma_timer.data = (unsigned long)(uart);
 647         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 648         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 649         add_timer(&(uart->rx_dma_timer));
 650 #else
 651 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 652         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 653         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
 654                 kgdboc_break_enabled = 0;
 655         else {
 656 # endif
 657         if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
 658              "BFIN_UART_RX", uart)) {
 659                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 660                 return -EBUSY;
 661         }
 662
 663         if (request_irq
 664             (uart->tx_irq, bfin_serial_tx_int, 0,
 665              "BFIN_UART_TX", uart)) {
 666                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 667                 free_irq(uart->rx_irq, uart);
 668                 return -EBUSY;
 669         }
 670
 671 # ifdef CONFIG_BF54x
 672         {
 673                 /*
 674                  * UART2 and UART3 on BF548 share interrupt PINs and DMA
 675                  * controllers with SPORT2 and SPORT3. UART rx and tx
 676                  * interrupts are generated in PIO mode only when configure
 677                  * their peripheral mapping registers properly, which means
 678                  * request corresponding DMA channels in PIO mode as well.
 679                  */
 680                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 681
 682                 switch (uart->rx_irq) {
 683                 case IRQ_UART3_RX:
 684                         uart_dma_ch_rx = CH_UART3_RX;
 685                         uart_dma_ch_tx = CH_UART3_TX;
 686                         break;
 687                 case IRQ_UART2_RX:
 688                         uart_dma_ch_rx = CH_UART2_RX;
 689                         uart_dma_ch_tx = CH_UART2_TX;
 690                         break;
 691                 default:
 692                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
 693                         break;
 694                 };
 695
 696                 if (uart_dma_ch_rx &&
 697                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 698                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
 699                         free_irq(uart->rx_irq, uart);
 700                         free_irq(uart->tx_irq, uart);
 701                         return -EBUSY;
 702                 }
 703                 if (uart_dma_ch_tx &&
 704                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 705                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 706                         free_dma(uart_dma_ch_rx);
 707                         free_irq(uart->rx_irq, uart);
 708                         free_irq(uart->tx_irq, uart);
 709                         return -EBUSY;
 710                 }
 711         }
 712 # endif
 713 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 714         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 715         }
 716 # endif
 717 #endif
 718
 719 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 720         if (uart->cts_pin >= 0) {
 721                 if (request_irq(gpio_to_irq(uart->cts_pin),
 722                         bfin_serial_mctrl_cts_int,
 723                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 724                         0, "BFIN_UART_CTS", uart)) {
 725                         uart->cts_pin = -1;
 726                         pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
 727                 }
 728         }
 729         if (uart->rts_pin >= 0) {
 730                 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
 731                         pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
 732                         uart->rts_pin = -1;
 733                 } else
 734                         gpio_direction_output(uart->rts_pin, 0);
 735         }
 736 #endif
 737 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 738         if (uart->cts_pin >= 0) {
 739                 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
 740                         IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
 741                         uart->cts_pin = -1;
 742                         dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
 743                 }
 744
 745                 /* CTS RTS PINs are negative assertive. */
 746                 UART_PUT_MCR(uart, ACTS);
 747                 UART_SET_IER(uart, EDSSI);
 748         }
 749 #endif
 750
 751         UART_SET_IER(uart, ERBFI);
 752         return 0;
 753 }
 754
 755 static void bfin_serial_shutdown(struct uart_port *port)
 756 {
 757         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 758
 759 #ifdef CONFIG_SERIAL_BFIN_DMA
 760         disable_dma(uart->tx_dma_channel);
 761         free_dma(uart->tx_dma_channel);
 762         disable_dma(uart->rx_dma_channel);
 763         free_dma(uart->rx_dma_channel);
 764         del_timer(&(uart->rx_dma_timer));
 765         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
 766 #else
 767 #ifdef CONFIG_BF54x
 768         switch (uart->port.irq) {
 769         case IRQ_UART3_RX:
 770                 free_dma(CH_UART3_RX);
 771                 free_dma(CH_UART3_TX);
 772                 break;
 773         case IRQ_UART2_RX:
 774                 free_dma(CH_UART2_RX);
 775                 free_dma(CH_UART2_TX);
 776                 break;
 777         default:
 778                 break;
 779         };
 780 #endif
 781         free_irq(uart->rx_irq, uart);
 782         free_irq(uart->tx_irq, uart);
 783 #endif
 784
 785 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 786         if (uart->cts_pin >= 0)
 787                 free_irq(gpio_to_irq(uart->cts_pin), uart);
 788         if (uart->rts_pin >= 0)
 789                 gpio_free(uart->rts_pin);
 790 #endif
 791 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 792         if (uart->cts_pin >= 0)
 793                 free_irq(uart->status_irq, uart);
 794 #endif
 795 }
 796
 797 static void
 798 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 799                    struct ktermios *old)
 800 {
 801         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 802         unsigned long flags;
 803         unsigned int baud, quot;
 804         unsigned short val, ier, lcr = 0;
 805
 806         switch (termios->c_cflag & CSIZE) {
 807         case CS8:
 808                 lcr = WLS(8);
 809                 break;
 810         case CS7:
 811                 lcr = WLS(7);
 812                 break;
 813         case CS6:
 814                 lcr = WLS(6);
 815                 break;
 816         case CS5:
 817                 lcr = WLS(5);
 818                 break;
 819         default:
 820                 printk(KERN_ERR "%s: word lengh not supported\n",
 821                         __func__);
 822         }
 823
 824         /* Anomaly notes:
 825          *  05000231 -  STOP bit is always set to 1 whatever the user is set.
 826          */
 827         if (termios->c_cflag & CSTOPB) {
 828                 if (ANOMALY_05000231)
 829                         printk(KERN_WARNING "STOP bits other than 1 is not "
 830                                 "supported in case of anomaly 05000231.\n");
 831                 else
 832                         lcr |= STB;
 833         }
 834         if (termios->c_cflag & PARENB)
 835                 lcr |= PEN;
 836         if (!(termios->c_cflag & PARODD))
 837                 lcr |= EPS;
 838         if (termios->c_cflag & CMSPAR)
 839                 lcr |= STP;
 840
 841         spin_lock_irqsave(&uart->port.lock, flags);
 842
 843         port->read_status_mask = OE;
 844         if (termios->c_iflag & INPCK)
 845                 port->read_status_mask |= (FE | PE);
 846         if (termios->c_iflag & (BRKINT | PARMRK))
 847                 port->read_status_mask |= BI;
 848
 849         /*
 850          * Characters to ignore
 851          */
 852         port->ignore_status_mask = 0;
 853         if (termios->c_iflag & IGNPAR)
 854                 port->ignore_status_mask |= FE | PE;
 855         if (termios->c_iflag & IGNBRK) {
 856                 port->ignore_status_mask |= BI;
 857                 /*
 858                  * If we're ignoring parity and break indicators,
 859                  * ignore overruns too (for real raw support).
 860                  */
 861                 if (termios->c_iflag & IGNPAR)
 862                         port->ignore_status_mask |= OE;
 863         }
 864
 865         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 866         quot = uart_get_divisor(port, baud);
 867
 868         /* If discipline is not IRDA, apply ANOMALY_05000230 */
 869         if (termios->c_line != N_IRDA)
 870                 quot -= ANOMALY_05000230;
 871
 872         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
 873
 874         /* Disable UART */
 875         ier = UART_GET_IER(uart);
 876         UART_DISABLE_INTS(uart);
 877
 878         /* Set DLAB in LCR to Access DLL and DLH */
 879         UART_SET_DLAB(uart);
 880
 881         UART_PUT_DLL(uart, quot & 0xFF);
 882         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 883         SSYNC();
 884
 885         /* Clear DLAB in LCR to Access THR RBR IER */
 886         UART_CLEAR_DLAB(uart);
 887
 888         UART_PUT_LCR(uart, lcr);
 889
 890         /* Enable UART */
 891         UART_ENABLE_INTS(uart, ier);
 892
 893         val = UART_GET_GCTL(uart);
 894         val |= UCEN;
 895         UART_PUT_GCTL(uart, val);
 896
 897         /* Port speed changed, update the per-port timeout. */
 898         uart_update_timeout(port, termios->c_cflag, baud);
 899
 900         spin_unlock_irqrestore(&uart->port.lock, flags);
 901 }
 902
 903 static const char *bfin_serial_type(struct uart_port *port)
 904 {
 905         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 906
 907         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 908 }
 909
 910 /*
 911  * Release the memory region(s) being used by 'port'.
 912  */
 913 static void bfin_serial_release_port(struct uart_port *port)
 914 {
 915 }
 916
 917 /*
 918  * Request the memory region(s) being used by 'port'.
 919  */
 920 static int bfin_serial_request_port(struct uart_port *port)
 921 {
 922         return 0;
 923 }
 924
 925 /*
 926  * Configure/autoconfigure the port.
 927  */
 928 static void bfin_serial_config_port(struct uart_port *port, int flags)
 929 {
 930         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 931
 932         if (flags & UART_CONFIG_TYPE &&
 933             bfin_serial_request_port(&uart->port) == 0)
 934                 uart->port.type = PORT_BFIN;
 935 }
 936
 937 /*
 938  * Verify the new serial_struct (for TIOCSSERIAL).
 939  * The only change we allow are to the flags and type, and
 940  * even then only between PORT_BFIN and PORT_UNKNOWN
 941  */
 942 static int
 943 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 944 {
 945         return 0;
 946 }
 947
 948 /*
 949  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
 950  * In other cases, disable IrDA function.
 951  */
 952 static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
 953 {
 954         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 955         unsigned short val;
 956
 957         switch (ld) {
 958         case N_IRDA:
 959                 val = UART_GET_GCTL(uart);
 960                 val |= (IREN | RPOLC);
 961                 UART_PUT_GCTL(uart, val);
 962                 break;
 963         default:
 964                 val = UART_GET_GCTL(uart);
 965                 val &= ~(IREN | RPOLC);
 966                 UART_PUT_GCTL(uart, val);
 967         }
 968 }
 969
 970 static void bfin_serial_reset_irda(struct uart_port *port)
 971 {
 972         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 973         unsigned short val;
 974
 975         val = UART_GET_GCTL(uart);
 976         val &= ~(IREN | RPOLC);
 977         UART_PUT_GCTL(uart, val);
 978         SSYNC();
 979         val |= (IREN | RPOLC);
 980         UART_PUT_GCTL(uart, val);
 981         SSYNC();
 982 }
 983
 984 #ifdef CONFIG_CONSOLE_POLL
 985 /* Anomaly notes:
 986  *  05000099 -  Because we only use THRE in poll_put and DR in poll_get,
 987  *              losing other bits of UART_LSR is not a problem here.
 988  */
 989 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
 990 {
 991         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 992
 993         while (!(UART_GET_LSR(uart) & THRE))
 994                 cpu_relax();
 995
 996         UART_CLEAR_DLAB(uart);
 997         UART_PUT_CHAR(uart, (unsigned char)chr);
 998 }
 999
1000 static int bfin_serial_poll_get_char(struct uart_port *port)
1001 {
1002         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1003         unsigned char chr;
1004
1005         while (!(UART_GET_LSR(uart) & DR))
1006                 cpu_relax();
1007
1008         UART_CLEAR_DLAB(uart);
1009         chr = UART_GET_CHAR(uart);
1010
1011         return chr;
1012 }
1013 #endif
1014
1015 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1016         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1017 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
1018 {
1019         if (kgdboc_break_enabled) {
1020                 kgdboc_break_enabled = 0;
1021                 bfin_serial_shutdown(port);
1022         }
1023 }
1024
1025 static int bfin_kgdboc_port_startup(struct uart_port *port)
1026 {
1027         kgdboc_port_line = port->line;
1028         kgdboc_break_enabled = !bfin_serial_startup(port);
1029         return 0;
1030 }
1031 #endif
1032
1033 static struct uart_ops bfin_serial_pops = {
1034         .tx_empty       = bfin_serial_tx_empty,
1035         .set_mctrl      = bfin_serial_set_mctrl,
1036         .get_mctrl      = bfin_serial_get_mctrl,
1037         .stop_tx        = bfin_serial_stop_tx,
1038         .start_tx       = bfin_serial_start_tx,
1039         .stop_rx        = bfin_serial_stop_rx,
1040         .enable_ms      = bfin_serial_enable_ms,
1041         .break_ctl      = bfin_serial_break_ctl,
1042         .startup        = bfin_serial_startup,
1043         .shutdown       = bfin_serial_shutdown,
1044         .set_termios    = bfin_serial_set_termios,
1045         .set_ldisc      = bfin_serial_set_ldisc,
1046         .type           = bfin_serial_type,
1047         .release_port   = bfin_serial_release_port,
1048         .request_port   = bfin_serial_request_port,
1049         .config_port    = bfin_serial_config_port,
1050         .verify_port    = bfin_serial_verify_port,
1051 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1052         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1053         .kgdboc_port_startup    = bfin_kgdboc_port_startup,
1054         .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
1055 #endif
1056 #ifdef CONFIG_CONSOLE_POLL
1057         .poll_put_char  = bfin_serial_poll_put_char,
1058         .poll_get_char  = bfin_serial_poll_get_char,
1059 #endif
1060 };
1061
1062 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1063 /*
1064  * If the port was already initialised (eg, by a boot loader),
1065  * try to determine the current setup.
1066  */
1067 static void __init
1068 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1069                            int *parity, int *bits)
1070 {
1071         unsigned short status;
1072
1073         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1074         if (status == (ERBFI | ETBEI)) {
1075                 /* ok, the port was enabled */
1076                 u16 lcr, dlh, dll;
1077
1078                 lcr = UART_GET_LCR(uart);
1079
1080                 *parity = 'n';
1081                 if (lcr & PEN) {
1082                         if (lcr & EPS)
1083                                 *parity = 'e';
1084                         else
1085                                 *parity = 'o';
1086                 }
1087                 switch (lcr & 0x03) {
1088                 case 0:
1089                         *bits = 5;
1090                         break;
1091                 case 1:
1092                         *bits = 6;
1093                         break;
1094                 case 2:
1095                         *bits = 7;
1096                         break;
1097                 case 3:
1098                         *bits = 8;
1099                         break;
1100                 }
1101                 /* Set DLAB in LCR to Access DLL and DLH */
1102                 UART_SET_DLAB(uart);
1103
1104                 dll = UART_GET_DLL(uart);
1105                 dlh = UART_GET_DLH(uart);
1106
1107                 /* Clear DLAB in LCR to Access THR RBR IER */
1108                 UART_CLEAR_DLAB(uart);
1109
1110                 *baud = get_sclk() / (16*(dll | dlh << 8));
1111         }
1112         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1113 }
1114
1115 static struct uart_driver bfin_serial_reg;
1116
1117 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1118 {
1119         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1120         while (!(UART_GET_LSR(uart) & THRE))
1121                 barrier();
1122         UART_PUT_CHAR(uart, ch);
1123 }
1124
1125 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1126                  defined (CONFIG_EARLY_PRINTK) */
1127
1128 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1129 #define CLASS_BFIN_CONSOLE      "bfin-console"
1130 /*
1131  * Interrupts are disabled on entering
1132  */
1133 static void
1134 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1135 {
1136         struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1137         unsigned long flags;
1138
1139         spin_lock_irqsave(&uart->port.lock, flags);
1140         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1141         spin_unlock_irqrestore(&uart->port.lock, flags);
1142
1143 }
1144
1145 static int __init
1146 bfin_serial_console_setup(struct console *co, char *options)
1147 {
1148         struct bfin_serial_port *uart;
1149         int baud = 57600;
1150         int bits = 8;
1151         int parity = 'n';
1152 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1153         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1154         int flow = 'r';
1155 # else
1156         int flow = 'n';
1157 # endif
1158
1159         /*
1160          * Check whether an invalid uart number has been specified, and
1161          * if so, search for the first available port that does have
1162          * console support.
1163          */
1164         if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1165                 return -ENODEV;
1166
1167         uart = bfin_serial_ports[co->index];
1168         if (!uart)
1169                 return -ENODEV;
1170
1171         if (options)
1172                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1173         else
1174                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1175
1176         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1177 }
1178
1179 static struct console bfin_serial_console = {
1180         .name           = BFIN_SERIAL_DEV_NAME,
1181         .write          = bfin_serial_console_write,
1182         .device         = uart_console_device,
1183         .setup          = bfin_serial_console_setup,
1184         .flags          = CON_PRINTBUFFER,
1185         .index          = -1,
1186         .data           = &bfin_serial_reg,
1187 };
1188 #define BFIN_SERIAL_CONSOLE     (&bfin_serial_console)
1189 #else
1190 #define BFIN_SERIAL_CONSOLE     NULL
1191 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1192
1193 #ifdef  CONFIG_EARLY_PRINTK
1194 static struct bfin_serial_port bfin_earlyprintk_port;
1195 #define CLASS_BFIN_EARLYPRINTK  "bfin-earlyprintk"
1196
1197 /*
1198  * Interrupts are disabled on entering
1199  */
1200 static void
1201 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1202 {
1203         unsigned long flags;
1204
1205         if (bfin_earlyprintk_port.port.line != co->index)
1206                 return;
1207
1208         spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1209         uart_console_write(&bfin_earlyprintk_port.port, s, count,
1210                 bfin_serial_console_putchar);
1211         spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1212 }
1213
1214 /*
1215  * This should have a .setup or .early_setup in it, but then things get called
1216  * without the command line options, and the baud rate gets messed up - so
1217  * don't let the common infrastructure play with things. (see calls to setup
1218  * & earlysetup in ./kernel/printk.c:register_console()
1219  */
1220 static struct __initdata console bfin_early_serial_console = {
1221         .name = "early_BFuart",
1222         .write = bfin_earlyprintk_console_write,
1223         .device = uart_console_device,
1224         .flags = CON_PRINTBUFFER,
1225         .index = -1,
1226         .data  = &bfin_serial_reg,
1227 };
1228 #endif
1229
1230 static struct uart_driver bfin_serial_reg = {
1231         .owner                  = THIS_MODULE,
1232         .driver_name            = DRIVER_NAME,
1233         .dev_name               = BFIN_SERIAL_DEV_NAME,
1234         .major                  = BFIN_SERIAL_MAJOR,
1235         .minor                  = BFIN_SERIAL_MINOR,
1236         .nr                     = BFIN_UART_NR_PORTS,
1237         .cons                   = BFIN_SERIAL_CONSOLE,
1238 };
1239
1240 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1241 {
1242         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1243
1244         return uart_suspend_port(&bfin_serial_reg, &uart->port);
1245 }
1246
1247 static int bfin_serial_resume(struct platform_device *pdev)
1248 {
1249         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1250
1251         return uart_resume_port(&bfin_serial_reg, &uart->port);
1252 }
1253
1254 static int bfin_serial_probe(struct platform_device *pdev)
1255 {
1256         struct resource *res;
1257         struct bfin_serial_port *uart = NULL;
1258         int ret = 0;
1259
1260         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1261                 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1262                 return -ENOENT;
1263         }
1264
1265         if (bfin_serial_ports[pdev->id] == NULL) {
1266
1267                 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1268                 if (!uart) {
1269                         dev_err(&pdev->dev,
1270                                 "fail to malloc bfin_serial_port\n");
1271                         return -ENOMEM;
1272                 }
1273                 bfin_serial_ports[pdev->id] = uart;
1274
1275 #ifdef CONFIG_EARLY_PRINTK
1276                 if (!(bfin_earlyprintk_port.port.membase
1277                         && bfin_earlyprintk_port.port.line == pdev->id)) {
1278                         /*
1279                          * If the peripheral PINs of current port is allocated
1280                          * in earlyprintk probe stage, don't do it again.
1281                          */
1282 #endif
1283                 ret = peripheral_request_list(
1284                         (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1285                 if (ret) {
1286                         dev_err(&pdev->dev,
1287                                 "fail to request bfin serial peripherals\n");
1288                         goto out_error_free_mem;
1289                 }
1290 #ifdef CONFIG_EARLY_PRINTK
1291                 }
1292 #endif
1293
1294                 spin_lock_init(&uart->port.lock);
1295                 uart->port.uartclk   = get_sclk();
1296                 uart->port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1297                 uart->port.ops       = &bfin_serial_pops;
1298                 uart->port.line      = pdev->id;
1299                 uart->port.iotype    = UPIO_MEM;
1300                 uart->port.flags     = UPF_BOOT_AUTOCONF;
1301
1302                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1303                 if (res == NULL) {
1304                         dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1305                         ret = -ENOENT;
1306                         goto out_error_free_peripherals;
1307                 }
1308
1309                 uart->port.membase = ioremap(res->start, resource_size(res));
1310                 if (!uart->port.membase) {
1311                         dev_err(&pdev->dev, "Cannot map uart IO\n");
1312                         ret = -ENXIO;
1313                         goto out_error_free_peripherals;
1314                 }
1315                 uart->port.mapbase = res->start;
1316
1317                 uart->tx_irq = platform_get_irq(pdev, 0);
1318                 if (uart->tx_irq < 0) {
1319                         dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1320                         ret = -ENOENT;
1321                         goto out_error_unmap;
1322                 }
1323
1324                 uart->rx_irq = platform_get_irq(pdev, 1);
1325                 if (uart->rx_irq < 0) {
1326                         dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1327                         ret = -ENOENT;
1328                         goto out_error_unmap;
1329                 }
1330                 uart->port.irq = uart->rx_irq;
1331
1332                 uart->status_irq = platform_get_irq(pdev, 2);
1333                 if (uart->status_irq < 0) {
1334                         dev_err(&pdev->dev, "No uart status IRQ specified\n");
1335                         ret = -ENOENT;
1336                         goto out_error_unmap;
1337                 }
1338
1339 #ifdef CONFIG_SERIAL_BFIN_DMA
1340                 spin_lock_init(&uart->rx_lock);
1341                 uart->tx_done       = 1;
1342                 uart->tx_count      = 0;
1343
1344                 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1345                 if (res == NULL) {
1346                         dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1347                         ret = -ENOENT;
1348                         goto out_error_unmap;
1349                 }
1350                 uart->tx_dma_channel = res->start;
1351
1352                 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1353                 if (res == NULL) {
1354                         dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1355                         ret = -ENOENT;
1356                         goto out_error_unmap;
1357                 }
1358                 uart->rx_dma_channel = res->start;
1359
1360                 init_timer(&(uart->rx_dma_timer));
1361 #endif
1362
1363 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1364         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1365                 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1366                 if (res == NULL)
1367                         uart->cts_pin = -1;
1368                 else {
1369                         uart->cts_pin = res->start;
1370 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1371                         uart->port.flags |= ASYNC_CTS_FLOW;
1372 #endif
1373                 }
1374
1375                 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1376                 if (res == NULL)
1377                         uart->rts_pin = -1;
1378                 else
1379                         uart->rts_pin = res->start;
1380 #endif
1381         }
1382
1383 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1384         if (!is_early_platform_device(pdev)) {
1385 #endif
1386                 uart = bfin_serial_ports[pdev->id];
1387                 uart->port.dev = &pdev->dev;
1388                 dev_set_drvdata(&pdev->dev, uart);
1389                 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1390 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1391         }
1392 #endif
1393
1394         if (!ret)
1395                 return 0;
1396
1397         if (uart) {
1398 out_error_unmap:
1399                 iounmap(uart->port.membase);
1400 out_error_free_peripherals:
1401                 peripheral_free_list(
1402                         (unsigned short *)pdev->dev.platform_data);
1403 out_error_free_mem:
1404                 kfree(uart);
1405                 bfin_serial_ports[pdev->id] = NULL;
1406         }
1407
1408         return ret;
1409 }
1410
1411 static int __devexit bfin_serial_remove(struct platform_device *pdev)
1412 {
1413         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1414
1415         dev_set_drvdata(&pdev->dev, NULL);
1416
1417         if (uart) {
1418                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1419                 iounmap(uart->port.membase);
1420                 peripheral_free_list(
1421                         (unsigned short *)pdev->dev.platform_data);
1422                 kfree(uart);
1423                 bfin_serial_ports[pdev->id] = NULL;
1424         }
1425
1426         return 0;
1427 }
1428
1429 static struct platform_driver bfin_serial_driver = {
1430         .probe          = bfin_serial_probe,
1431         .remove         = __devexit_p(bfin_serial_remove),
1432         .suspend        = bfin_serial_suspend,
1433         .resume         = bfin_serial_resume,
1434         .driver         = {
1435                 .name   = DRIVER_NAME,
1436                 .owner  = THIS_MODULE,
1437         },
1438 };
1439
1440 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1441 static __initdata struct early_platform_driver early_bfin_serial_driver = {
1442         .class_str = CLASS_BFIN_CONSOLE,
1443         .pdrv = &bfin_serial_driver,
1444         .requested_id = EARLY_PLATFORM_ID_UNSET,
1445 };
1446
1447 static int __init bfin_serial_rs_console_init(void)
1448 {
1449         early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1450
1451         early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1452
1453         register_console(&bfin_serial_console);
1454
1455         return 0;
1456 }
1457 console_initcall(bfin_serial_rs_console_init);
1458 #endif
1459
1460 #ifdef CONFIG_EARLY_PRINTK
1461 /*
1462  * Memory can't be allocated dynamically during earlyprink init stage.
1463  * So, do individual probe for earlyprink with a static uart port variable.
1464  */
1465 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1466 {
1467         struct resource *res;
1468         int ret;
1469
1470         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1471                 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1472                 return -ENOENT;
1473         }
1474
1475         ret = peripheral_request_list(
1476                 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1477         if (ret) {
1478                 dev_err(&pdev->dev,
1479                                 "fail to request bfin serial peripherals\n");
1480                         return ret;
1481         }
1482
1483         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1484         if (res == NULL) {
1485                 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1486                 ret = -ENOENT;
1487                 goto out_error_free_peripherals;
1488         }
1489
1490         bfin_earlyprintk_port.port.membase = ioremap(res->start,
1491                                                      resource_size(res));
1492         if (!bfin_earlyprintk_port.port.membase) {
1493                 dev_err(&pdev->dev, "Cannot map uart IO\n");
1494                 ret = -ENXIO;
1495                 goto out_error_free_peripherals;
1496         }
1497         bfin_earlyprintk_port.port.mapbase = res->start;
1498         bfin_earlyprintk_port.port.line = pdev->id;
1499         bfin_earlyprintk_port.port.uartclk = get_sclk();
1500         bfin_earlyprintk_port.port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1501         spin_lock_init(&bfin_earlyprintk_port.port.lock);
1502
1503         return 0;
1504
1505 out_error_free_peripherals:
1506         peripheral_free_list(
1507                 (unsigned short *)pdev->dev.platform_data);
1508
1509         return ret;
1510 }
1511
1512 static struct platform_driver bfin_earlyprintk_driver = {
1513         .probe          = bfin_earlyprintk_probe,
1514         .driver         = {
1515                 .name   = DRIVER_NAME,
1516                 .owner  = THIS_MODULE,
1517         },
1518 };
1519
1520 static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
1521         .class_str = CLASS_BFIN_EARLYPRINTK,
1522         .pdrv = &bfin_earlyprintk_driver,
1523         .requested_id = EARLY_PLATFORM_ID_UNSET,
1524 };
1525
1526 struct console __init *bfin_earlyserial_init(unsigned int port,
1527                                                 unsigned int cflag)
1528 {
1529         struct ktermios t;
1530         char port_name[20];
1531
1532         if (port < 0 || port >= BFIN_UART_NR_PORTS)
1533                 return NULL;
1534
1535         /*
1536          * Only probe resource of the given port in earlyprintk boot arg.
1537          * The expected port id should be indicated in port name string.
1538          */
1539         snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1540         early_platform_driver_register(&early_bfin_earlyprintk_driver,
1541                 port_name);
1542         early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1543
1544         if (!bfin_earlyprintk_port.port.membase)
1545                 return NULL;
1546
1547 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1548         /*
1549          * If we are using early serial, don't let the normal console rewind
1550          * log buffer, since that causes things to be printed multiple times
1551          */
1552         bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1553 #endif
1554
1555         bfin_early_serial_console.index = port;
1556         t.c_cflag = cflag;
1557         t.c_iflag = 0;
1558         t.c_oflag = 0;
1559         t.c_lflag = ICANON;
1560         t.c_line = port;
1561         bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1562
1563         return &bfin_early_serial_console;
1564 }
1565 #endif /* CONFIG_EARLY_PRINTK */
1566
1567 static int __init bfin_serial_init(void)
1568 {
1569         int ret;
1570
1571         pr_info("Blackfin serial driver\n");
1572
1573         ret = uart_register_driver(&bfin_serial_reg);
1574         if (ret) {
1575                 pr_err("failed to register %s:%d\n",
1576                         bfin_serial_reg.driver_name, ret);
1577         }
1578
1579         ret = platform_driver_register(&bfin_serial_driver);
1580         if (ret) {
1581                 pr_err("fail to register bfin uart\n");
1582                 uart_unregister_driver(&bfin_serial_reg);
1583         }
1584
1585         return ret;
1586 }
1587
1588 static void __exit bfin_serial_exit(void)
1589 {
1590         platform_driver_unregister(&bfin_serial_driver);
1591         uart_unregister_driver(&bfin_serial_reg);
1592 }
1593
1594
1595 module_init(bfin_serial_init);
1596 module_exit(bfin_serial_exit);
1597
1598 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1599 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1600 MODULE_LICENSE("GPL");
1601 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1602 MODULE_ALIAS("platform:bfin-uart");