drivers/serial/omap-serial.c

   1 /*
   2  * Driver for OMAP-UART controller.
   3  * Based on drivers/serial/8250.c
   4  *
   5  * Copyright (C) 2010 Texas Instruments.
   6  *
   7  * Authors:
   8  *      Govindraj R     <govindraj.raja@ti.com>
   9  *      Thara Gopinath  <thara@ti.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * Note: This driver is made seperate from 8250 driver as we cannot
  17  * over load 8250 driver with omap platform specific configuration for
  18  * features like DMA, it makes easier to implement features like DMA and
  19  * hardware flow control and software flow control configuration with
  20  * this driver as required for the omap-platform.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/console.h>
  26 #include <linux/serial_reg.h>
  27 #include <linux/delay.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_flip.h>
  31 #include <linux/io.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/clk.h>
  34 #include <linux/serial_core.h>
  35 #include <linux/irq.h>
  36
  37 #include <plat/dma.h>
  38 #include <plat/dmtimer.h>
  39 #include <plat/omap-serial.h>
  40
  41 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
  42
  43 /* Forward declaration of functions */
  44 static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
  45 static void serial_omap_rx_timeout(unsigned long uart_no);
  46 static int serial_omap_start_rxdma(struct uart_omap_port *up);
  47
  48 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
  49 {
  50         offset <<= up->port.regshift;
  51         return readw(up->port.membase + offset);
  52 }
  53
  54 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
  55 {
  56         offset <<= up->port.regshift;
  57         writew(value, up->port.membase + offset);
  58 }
  59
  60 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
  61 {
  62         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
  63         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
  64                        UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
  65         serial_out(up, UART_FCR, 0);
  66 }
  67
  68 /*
  69  * serial_omap_get_divisor - calculate divisor value
  70  * @port: uart port info
  71  * @baud: baudrate for which divisor needs to be calculated.
  72  *
  73  * We have written our own function to get the divisor so as to support
  74  * 13x mode. 3Mbps Baudrate as an different divisor.
  75  * Reference OMAP TRM Chapter 17:
  76  * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
  77  * referring to oversampling - divisor value
  78  * baudrate 460,800 to 3,686,400 all have divisor 13
  79  * except 3,000,000 which has divisor value 16
  80  */
  81 static unsigned int
  82 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
  83 {
  84         unsigned int divisor;
  85
  86         if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
  87                 divisor = 13;
  88         else
  89                 divisor = 16;
  90         return port->uartclk/(baud * divisor);
  91 }
  92
  93 static void serial_omap_stop_rxdma(struct uart_omap_port *up)
  94 {
  95         if (up->uart_dma.rx_dma_used) {
  96                 del_timer(&up->uart_dma.rx_timer);
  97                 omap_stop_dma(up->uart_dma.rx_dma_channel);
  98                 omap_free_dma(up->uart_dma.rx_dma_channel);
  99                 up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
 100                 up->uart_dma.rx_dma_used = false;
 101         }
 102 }
 103
 104 static void serial_omap_enable_ms(struct uart_port *port)
 105 {
 106         struct uart_omap_port *up = (struct uart_omap_port *)port;
 107
 108         dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->pdev->id);
 109         up->ier |= UART_IER_MSI;
 110         serial_out(up, UART_IER, up->ier);
 111 }
 112
 113 static void serial_omap_stop_tx(struct uart_port *port)
 114 {
 115         struct uart_omap_port *up = (struct uart_omap_port *)port;
 116
 117         if (up->use_dma &&
 118                 up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) {
 119                 /*
 120                  * Check if dma is still active. If yes do nothing,
 121                  * return. Else stop dma
 122                  */
 123                 if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel))
 124                         return;
 125                 omap_stop_dma(up->uart_dma.tx_dma_channel);
 126                 omap_free_dma(up->uart_dma.tx_dma_channel);
 127                 up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
 128         }
 129
 130         if (up->ier & UART_IER_THRI) {
 131                 up->ier &= ~UART_IER_THRI;
 132                 serial_out(up, UART_IER, up->ier);
 133         }
 134 }
 135
 136 static void serial_omap_stop_rx(struct uart_port *port)
 137 {
 138         struct uart_omap_port *up = (struct uart_omap_port *)port;
 139
 140         if (up->use_dma)
 141                 serial_omap_stop_rxdma(up);
 142         up->ier &= ~UART_IER_RLSI;
 143         up->port.read_status_mask &= ~UART_LSR_DR;
 144         serial_out(up, UART_IER, up->ier);
 145 }
 146
 147 static inline void receive_chars(struct uart_omap_port *up, int *status)
 148 {
 149         struct tty_struct *tty = up->port.state->port.tty;
 150         unsigned int flag;
 151         unsigned char ch, lsr = *status;
 152         int max_count = 256;
 153
 154         do {
 155                 if (likely(lsr & UART_LSR_DR))
 156                         ch = serial_in(up, UART_RX);
 157                 flag = TTY_NORMAL;
 158                 up->port.icount.rx++;
 159
 160                 if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
 161                         /*
 162                          * For statistics only
 163                          */
 164                         if (lsr & UART_LSR_BI) {
 165                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 166                                 up->port.icount.brk++;
 167                                 /*
 168                                  * We do the SysRQ and SAK checking
 169                                  * here because otherwise the break
 170                                  * may get masked by ignore_status_mask
 171                                  * or read_status_mask.
 172                                  */
 173                                 if (uart_handle_break(&up->port))
 174                                         goto ignore_char;
 175                         } else if (lsr & UART_LSR_PE) {
 176                                 up->port.icount.parity++;
 177                         } else if (lsr & UART_LSR_FE) {
 178                                 up->port.icount.frame++;
 179                         }
 180
 181                         if (lsr & UART_LSR_OE)
 182                                 up->port.icount.overrun++;
 183
 184                         /*
 185                          * Mask off conditions which should be ignored.
 186                          */
 187                         lsr &= up->port.read_status_mask;
 188
 189 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
 190                         if (up->port.line == up->port.cons->index) {
 191                                 /* Recover the break flag from console xmit */
 192                                 lsr |= up->lsr_break_flag;
 193                                 up->lsr_break_flag = 0;
 194                         }
 195 #endif
 196                         if (lsr & UART_LSR_BI)
 197                                 flag = TTY_BREAK;
 198                         else if (lsr & UART_LSR_PE)
 199                                 flag = TTY_PARITY;
 200                         else if (lsr & UART_LSR_FE)
 201                                 flag = TTY_FRAME;
 202                 }
 203
 204                 if (uart_handle_sysrq_char(&up->port, ch))
 205                         goto ignore_char;
 206                 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
 207 ignore_char:
 208                 lsr = serial_in(up, UART_LSR);
 209         } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
 210         spin_unlock(&up->port.lock);
 211         tty_flip_buffer_push(tty);
 212         spin_lock(&up->port.lock);
 213 }
 214
 215 static void transmit_chars(struct uart_omap_port *up)
 216 {
 217         struct circ_buf *xmit = &up->port.state->xmit;
 218         int count;
 219
 220         if (up->port.x_char) {
 221                 serial_out(up, UART_TX, up->port.x_char);
 222                 up->port.icount.tx++;
 223                 up->port.x_char = 0;
 224                 return;
 225         }
 226         if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
 227                 serial_omap_stop_tx(&up->port);
 228                 return;
 229         }
 230         count = up->port.fifosize / 4;
 231         do {
 232                 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
 233                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 234                 up->port.icount.tx++;
 235                 if (uart_circ_empty(xmit))
 236                         break;
 237         } while (--count > 0);
 238
 239         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 240                 uart_write_wakeup(&up->port);
 241
 242         if (uart_circ_empty(xmit))
 243                 serial_omap_stop_tx(&up->port);
 244 }
 245
 246 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
 247 {
 248         if (!(up->ier & UART_IER_THRI)) {
 249                 up->ier |= UART_IER_THRI;
 250                 serial_out(up, UART_IER, up->ier);
 251         }
 252 }
 253
 254 static void serial_omap_start_tx(struct uart_port *port)
 255 {
 256         struct uart_omap_port *up = (struct uart_omap_port *)port;
 257         struct circ_buf *xmit;
 258         unsigned int start;
 259         int ret = 0;
 260
 261         if (!up->use_dma) {
 262                 serial_omap_enable_ier_thri(up);
 263                 return;
 264         }
 265
 266         if (up->uart_dma.tx_dma_used)
 267                 return;
 268
 269         xmit = &up->port.state->xmit;
 270
 271         if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) {
 272                 ret = omap_request_dma(up->uart_dma.uart_dma_tx,
 273                                 "UART Tx DMA",
 274                                 (void *)uart_tx_dma_callback, up,
 275                                 &(up->uart_dma.tx_dma_channel));
 276
 277                 if (ret < 0) {
 278                         serial_omap_enable_ier_thri(up);
 279                         return;
 280                 }
 281         }
 282         spin_lock(&(up->uart_dma.tx_lock));
 283         up->uart_dma.tx_dma_used = true;
 284         spin_unlock(&(up->uart_dma.tx_lock));
 285
 286         start = up->uart_dma.tx_buf_dma_phys +
 287                                 (xmit->tail & (UART_XMIT_SIZE - 1));
 288
 289         up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
 290         /*
 291          * It is a circular buffer. See if the buffer has wounded back.
 292          * If yes it will have to be transferred in two separate dma
 293          * transfers
 294          */
 295         if (start + up->uart_dma.tx_buf_size >=
 296                         up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
 297                 up->uart_dma.tx_buf_size =
 298                         (up->uart_dma.tx_buf_dma_phys +
 299                         UART_XMIT_SIZE) - start;
 300
 301         omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
 302                                 OMAP_DMA_AMODE_CONSTANT,
 303                                 up->uart_dma.uart_base, 0, 0);
 304         omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
 305                                 OMAP_DMA_AMODE_POST_INC, start, 0, 0);
 306         omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
 307                                 OMAP_DMA_DATA_TYPE_S8,
 308                                 up->uart_dma.tx_buf_size, 1,
 309                                 OMAP_DMA_SYNC_ELEMENT,
 310                                 up->uart_dma.uart_dma_tx, 0);
 311         /* FIXME: Cache maintenance needed here? */
 312         omap_start_dma(up->uart_dma.tx_dma_channel);
 313 }
 314
 315 static unsigned int check_modem_status(struct uart_omap_port *up)
 316 {
 317         unsigned int status;
 318
 319         status = serial_in(up, UART_MSR);
 320         status |= up->msr_saved_flags;
 321         up->msr_saved_flags = 0;
 322         if ((status & UART_MSR_ANY_DELTA) == 0)
 323                 return status;
 324
 325         if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
 326             up->port.state != NULL) {
 327                 if (status & UART_MSR_TERI)
 328                         up->port.icount.rng++;
 329                 if (status & UART_MSR_DDSR)
 330                         up->port.icount.dsr++;
 331                 if (status & UART_MSR_DDCD)
 332                         uart_handle_dcd_change
 333                                 (&up->port, status & UART_MSR_DCD);
 334                 if (status & UART_MSR_DCTS)
 335                         uart_handle_cts_change
 336                                 (&up->port, status & UART_MSR_CTS);
 337                 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 338         }
 339
 340         return status;
 341 }
 342
 343 /**
 344  * serial_omap_irq() - This handles the interrupt from one port
 345  * @irq: uart port irq number
 346  * @dev_id: uart port info
 347  */
 348 static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
 349 {
 350         struct uart_omap_port *up = dev_id;
 351         unsigned int iir, lsr;
 352         unsigned long flags;
 353
 354         iir = serial_in(up, UART_IIR);
 355         if (iir & UART_IIR_NO_INT)
 356                 return IRQ_NONE;
 357
 358         spin_lock_irqsave(&up->port.lock, flags);
 359         lsr = serial_in(up, UART_LSR);
 360         if (iir & UART_IIR_RLSI) {
 361                 if (!up->use_dma) {
 362                         if (lsr & UART_LSR_DR)
 363                                 receive_chars(up, &lsr);
 364                 } else {
 365                         up->ier &= ~(UART_IER_RDI | UART_IER_RLSI);
 366                         serial_out(up, UART_IER, up->ier);
 367                         if ((serial_omap_start_rxdma(up) != 0) &&
 368                                         (lsr & UART_LSR_DR))
 369                                 receive_chars(up, &lsr);
 370                 }
 371         }
 372
 373         check_modem_status(up);
 374         if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI))
 375                 transmit_chars(up);
 376
 377         spin_unlock_irqrestore(&up->port.lock, flags);
 378         up->port_activity = jiffies;
 379         return IRQ_HANDLED;
 380 }
 381
 382 static unsigned int serial_omap_tx_empty(struct uart_port *port)
 383 {
 384         struct uart_omap_port *up = (struct uart_omap_port *)port;
 385         unsigned long flags = 0;
 386         unsigned int ret = 0;
 387
 388         dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->pdev->id);
 389         spin_lock_irqsave(&up->port.lock, flags);
 390         ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
 391         spin_unlock_irqrestore(&up->port.lock, flags);
 392
 393         return ret;
 394 }
 395
 396 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
 397 {
 398         struct uart_omap_port *up = (struct uart_omap_port *)port;
 399         unsigned char status;
 400         unsigned int ret = 0;
 401
 402         status = check_modem_status(up);
 403         dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->pdev->id);
 404
 405         if (status & UART_MSR_DCD)
 406                 ret |= TIOCM_CAR;
 407         if (status & UART_MSR_RI)
 408                 ret |= TIOCM_RNG;
 409         if (status & UART_MSR_DSR)
 410                 ret |= TIOCM_DSR;
 411         if (status & UART_MSR_CTS)
 412                 ret |= TIOCM_CTS;
 413         return ret;
 414 }
 415
 416 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
 417 {
 418         struct uart_omap_port *up = (struct uart_omap_port *)port;
 419         unsigned char mcr = 0;
 420
 421         dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->pdev->id);
 422         if (mctrl & TIOCM_RTS)
 423                 mcr |= UART_MCR_RTS;
 424         if (mctrl & TIOCM_DTR)
 425                 mcr |= UART_MCR_DTR;
 426         if (mctrl & TIOCM_OUT1)
 427                 mcr |= UART_MCR_OUT1;
 428         if (mctrl & TIOCM_OUT2)
 429                 mcr |= UART_MCR_OUT2;
 430         if (mctrl & TIOCM_LOOP)
 431                 mcr |= UART_MCR_LOOP;
 432
 433         mcr |= up->mcr;
 434         serial_out(up, UART_MCR, mcr);
 435 }
 436
 437 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
 438 {
 439         struct uart_omap_port *up = (struct uart_omap_port *)port;
 440         unsigned long flags = 0;
 441
 442         dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->pdev->id);
 443         spin_lock_irqsave(&up->port.lock, flags);
 444         if (break_state == -1)
 445                 up->lcr |= UART_LCR_SBC;
 446         else
 447                 up->lcr &= ~UART_LCR_SBC;
 448         serial_out(up, UART_LCR, up->lcr);
 449         spin_unlock_irqrestore(&up->port.lock, flags);
 450 }
 451
 452 static int serial_omap_startup(struct uart_port *port)
 453 {
 454         struct uart_omap_port *up = (struct uart_omap_port *)port;
 455         unsigned long flags = 0;
 456         int retval;
 457
 458         /*
 459          * Allocate the IRQ
 460          */
 461         retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
 462                                 up->name, up);
 463         if (retval)
 464                 return retval;
 465
 466         dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->pdev->id);
 467
 468         /*
 469          * Clear the FIFO buffers and disable them.
 470          * (they will be reenabled in set_termios())
 471          */
 472         serial_omap_clear_fifos(up);
 473         /* For Hardware flow control */
 474         serial_out(up, UART_MCR, UART_MCR_RTS);
 475
 476         /*
 477          * Clear the interrupt registers.
 478          */
 479         (void) serial_in(up, UART_LSR);
 480         if (serial_in(up, UART_LSR) & UART_LSR_DR)
 481                 (void) serial_in(up, UART_RX);
 482         (void) serial_in(up, UART_IIR);
 483         (void) serial_in(up, UART_MSR);
 484
 485         /*
 486          * Now, initialize the UART
 487          */
 488         serial_out(up, UART_LCR, UART_LCR_WLEN8);
 489         spin_lock_irqsave(&up->port.lock, flags);
 490         /*
 491          * Most PC uarts need OUT2 raised to enable interrupts.
 492          */
 493         up->port.mctrl |= TIOCM_OUT2;
 494         serial_omap_set_mctrl(&up->port, up->port.mctrl);
 495         spin_unlock_irqrestore(&up->port.lock, flags);
 496
 497         up->msr_saved_flags = 0;
 498         if (up->use_dma) {
 499                 free_page((unsigned long)up->port.state->xmit.buf);
 500                 up->port.state->xmit.buf = dma_alloc_coherent(NULL,
 501                         UART_XMIT_SIZE,
 502                         (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys),
 503                         0);
 504                 init_timer(&(up->uart_dma.rx_timer));
 505                 up->uart_dma.rx_timer.function = serial_omap_rx_timeout;
 506                 up->uart_dma.rx_timer.data = up->pdev->id;
 507                 /* Currently the buffer size is 4KB. Can increase it */
 508                 up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
 509                         up->uart_dma.rx_buf_size,
 510                         (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
 511         }
 512         /*
 513          * Finally, enable interrupts. Note: Modem status interrupts
 514          * are set via set_termios(), which will be occurring imminently
 515          * anyway, so we don't enable them here.
 516          */
 517         up->ier = UART_IER_RLSI | UART_IER_RDI;
 518         serial_out(up, UART_IER, up->ier);
 519
 520         up->port_activity = jiffies;
 521         return 0;
 522 }
 523
 524 static void serial_omap_shutdown(struct uart_port *port)
 525 {
 526         struct uart_omap_port *up = (struct uart_omap_port *)port;
 527         unsigned long flags = 0;
 528
 529         dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id);
 530         /*
 531          * Disable interrupts from this port
 532          */
 533         up->ier = 0;
 534         serial_out(up, UART_IER, 0);
 535
 536         spin_lock_irqsave(&up->port.lock, flags);
 537         up->port.mctrl &= ~TIOCM_OUT2;
 538         serial_omap_set_mctrl(&up->port, up->port.mctrl);
 539         spin_unlock_irqrestore(&up->port.lock, flags);
 540
 541         /*
 542          * Disable break condition and FIFOs
 543          */
 544         serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
 545         serial_omap_clear_fifos(up);
 546
 547         /*
 548          * Read data port to reset things, and then free the irq
 549          */
 550         if (serial_in(up, UART_LSR) & UART_LSR_DR)
 551                 (void) serial_in(up, UART_RX);
 552         if (up->use_dma) {
 553                 dma_free_coherent(up->port.dev,
 554                         UART_XMIT_SIZE, up->port.state->xmit.buf,
 555                         up->uart_dma.tx_buf_dma_phys);
 556                 up->port.state->xmit.buf = NULL;
 557                 serial_omap_stop_rx(port);
 558                 dma_free_coherent(up->port.dev,
 559                         up->uart_dma.rx_buf_size, up->uart_dma.rx_buf,
 560                         up->uart_dma.rx_buf_dma_phys);
 561                 up->uart_dma.rx_buf = NULL;
 562         }
 563         free_irq(up->port.irq, up);
 564 }
 565
 566 static inline void
 567 serial_omap_configure_xonxoff
 568                 (struct uart_omap_port *up, struct ktermios *termios)
 569 {
 570         unsigned char efr = 0;
 571
 572         up->lcr = serial_in(up, UART_LCR);
 573         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 574         up->efr = serial_in(up, UART_EFR);
 575         serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
 576
 577         serial_out(up, UART_XON1, termios->c_cc[VSTART]);
 578         serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
 579
 580         /* clear SW control mode bits */
 581         efr = up->efr;
 582         efr &= OMAP_UART_SW_CLR;
 583
 584         /*
 585          * IXON Flag:
 586          * Enable XON/XOFF flow control on output.
 587          * Transmit XON1, XOFF1
 588          */
 589         if (termios->c_iflag & IXON)
 590                 efr |= OMAP_UART_SW_TX;
 591
 592         /*
 593          * IXOFF Flag:
 594          * Enable XON/XOFF flow control on input.
 595          * Receiver compares XON1, XOFF1.
 596          */
 597         if (termios->c_iflag & IXOFF)
 598                 efr |= OMAP_UART_SW_RX;
 599
 600         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
 601         serial_out(up, UART_LCR, UART_LCR_DLAB);
 602
 603         up->mcr = serial_in(up, UART_MCR);
 604
 605         /*
 606          * IXANY Flag:
 607          * Enable any character to restart output.
 608          * Operation resumes after receiving any
 609          * character after recognition of the XOFF character
 610          */
 611         if (termios->c_iflag & IXANY)
 612                 up->mcr |= UART_MCR_XONANY;
 613
 614         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
 615         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 616         serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
 617         /* Enable special char function UARTi.EFR_REG[5] and
 618          * load the new software flow control mode IXON or IXOFF
 619          * and restore the UARTi.EFR_REG[4] ENHANCED_EN value.
 620          */
 621         serial_out(up, UART_EFR, efr | UART_EFR_SCD);
 622         serial_out(up, UART_LCR, UART_LCR_DLAB);
 623
 624         serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
 625         serial_out(up, UART_LCR, up->lcr);
 626 }
 627
 628 static void
 629 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 630                         struct ktermios *old)
 631 {
 632         struct uart_omap_port *up = (struct uart_omap_port *)port;
 633         unsigned char cval = 0;
 634         unsigned char efr = 0;
 635         unsigned long flags = 0;
 636         unsigned int baud, quot;
 637
 638         switch (termios->c_cflag & CSIZE) {
 639         case CS5:
 640                 cval = UART_LCR_WLEN5;
 641                 break;
 642         case CS6:
 643                 cval = UART_LCR_WLEN6;
 644                 break;
 645         case CS7:
 646                 cval = UART_LCR_WLEN7;
 647                 break;
 648         default:
 649         case CS8:
 650                 cval = UART_LCR_WLEN8;
 651                 break;
 652         }
 653
 654         if (termios->c_cflag & CSTOPB)
 655                 cval |= UART_LCR_STOP;
 656         if (termios->c_cflag & PARENB)
 657                 cval |= UART_LCR_PARITY;
 658         if (!(termios->c_cflag & PARODD))
 659                 cval |= UART_LCR_EPAR;
 660
 661         /*
 662          * Ask the core to calculate the divisor for us.
 663          */
 664
 665         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
 666         quot = serial_omap_get_divisor(port, baud);
 667
 668         up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
 669                         UART_FCR_ENABLE_FIFO;
 670         if (up->use_dma)
 671                 up->fcr |= UART_FCR_DMA_SELECT;
 672
 673         /*
 674          * Ok, we're now changing the port state. Do it with
 675          * interrupts disabled.
 676          */
 677         spin_lock_irqsave(&up->port.lock, flags);
 678
 679         /*
 680          * Update the per-port timeout.
 681          */
 682         uart_update_timeout(port, termios->c_cflag, baud);
 683
 684         up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 685         if (termios->c_iflag & INPCK)
 686                 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 687         if (termios->c_iflag & (BRKINT | PARMRK))
 688                 up->port.read_status_mask |= UART_LSR_BI;
 689
 690         /*
 691          * Characters to ignore
 692          */
 693         up->port.ignore_status_mask = 0;
 694         if (termios->c_iflag & IGNPAR)
 695                 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 696         if (termios->c_iflag & IGNBRK) {
 697                 up->port.ignore_status_mask |= UART_LSR_BI;
 698                 /*
 699                  * If we're ignoring parity and break indicators,
 700                  * ignore overruns too (for real raw support).
 701                  */
 702                 if (termios->c_iflag & IGNPAR)
 703                         up->port.ignore_status_mask |= UART_LSR_OE;
 704         }
 705
 706         /*
 707          * ignore all characters if CREAD is not set
 708          */
 709         if ((termios->c_cflag & CREAD) == 0)
 710                 up->port.ignore_status_mask |= UART_LSR_DR;
 711
 712         /*
 713          * Modem status interrupts
 714          */
 715         up->ier &= ~UART_IER_MSI;
 716         if (UART_ENABLE_MS(&up->port, termios->c_cflag))
 717                 up->ier |= UART_IER_MSI;
 718         serial_out(up, UART_IER, up->ier);
 719         serial_out(up, UART_LCR, cval);         /* reset DLAB */
 720
 721         /* FIFOs and DMA Settings */
 722
 723         /* FCR can be changed only when the
 724          * baud clock is not running
 725          * DLL_REG and DLH_REG set to 0.
 726          */
 727         serial_out(up, UART_LCR, UART_LCR_DLAB);
 728         serial_out(up, UART_DLL, 0);
 729         serial_out(up, UART_DLM, 0);
 730         serial_out(up, UART_LCR, 0);
 731
 732         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 733
 734         up->efr = serial_in(up, UART_EFR);
 735         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
 736
 737         serial_out(up, UART_LCR, UART_LCR_DLAB);
 738         up->mcr = serial_in(up, UART_MCR);
 739         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
 740         /* FIFO ENABLE, DMA MODE */
 741         serial_out(up, UART_FCR, up->fcr);
 742         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 743
 744         if (up->use_dma) {
 745                 serial_out(up, UART_TI752_TLR, 0);
 746                 serial_out(up, UART_OMAP_SCR,
 747                         (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8));
 748         }
 749
 750         serial_out(up, UART_EFR, up->efr);
 751         serial_out(up, UART_LCR, UART_LCR_DLAB);
 752         serial_out(up, UART_MCR, up->mcr);
 753
 754         /* Protocol, Baud Rate, and Interrupt Settings */
 755
 756         serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_DISABLE);
 757         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 758
 759         up->efr = serial_in(up, UART_EFR);
 760         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
 761
 762         serial_out(up, UART_LCR, 0);
 763         serial_out(up, UART_IER, 0);
 764         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 765
 766         serial_out(up, UART_DLL, quot & 0xff);          /* LS of divisor */
 767         serial_out(up, UART_DLM, quot >> 8);            /* MS of divisor */
 768
 769         serial_out(up, UART_LCR, 0);
 770         serial_out(up, UART_IER, up->ier);
 771         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 772
 773         serial_out(up, UART_EFR, up->efr);
 774         serial_out(up, UART_LCR, cval);
 775
 776         if (baud > 230400 && baud != 3000000)
 777                 serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_MODE13X);
 778         else
 779                 serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_MODE16X);
 780
 781         /* Hardware Flow Control Configuration */
 782
 783         if (termios->c_cflag & CRTSCTS) {
 784                 efr |= (UART_EFR_CTS | UART_EFR_RTS);
 785                 serial_out(up, UART_LCR, UART_LCR_DLAB);
 786
 787                 up->mcr = serial_in(up, UART_MCR);
 788                 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
 789
 790                 serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 791                 up->efr = serial_in(up, UART_EFR);
 792                 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
 793
 794                 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
 795                 serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */
 796                 serial_out(up, UART_LCR, UART_LCR_DLAB);
 797                 serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
 798                 serial_out(up, UART_LCR, cval);
 799         }
 800
 801         serial_omap_set_mctrl(&up->port, up->port.mctrl);
 802         /* Software Flow Control Configuration */
 803         if (termios->c_iflag & (IXON | IXOFF))
 804                 serial_omap_configure_xonxoff(up, termios);
 805
 806         spin_unlock_irqrestore(&up->port.lock, flags);
 807         dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id);
 808 }
 809
 810 static void
 811 serial_omap_pm(struct uart_port *port, unsigned int state,
 812                unsigned int oldstate)
 813 {
 814         struct uart_omap_port *up = (struct uart_omap_port *)port;
 815         unsigned char efr;
 816
 817         dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id);
 818         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 819         efr = serial_in(up, UART_EFR);
 820         serial_out(up, UART_EFR, efr | UART_EFR_ECB);
 821         serial_out(up, UART_LCR, 0);
 822
 823         serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
 824         serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
 825         serial_out(up, UART_EFR, efr);
 826         serial_out(up, UART_LCR, 0);
 827         /* Enable module level wake up */
 828         serial_out(up, UART_OMAP_WER,
 829                 (state != 0) ? OMAP_UART_WER_MOD_WKUP : 0);
 830 }
 831
 832 static void serial_omap_release_port(struct uart_port *port)
 833 {
 834         dev_dbg(port->dev, "serial_omap_release_port+\n");
 835 }
 836
 837 static int serial_omap_request_port(struct uart_port *port)
 838 {
 839         dev_dbg(port->dev, "serial_omap_request_port+\n");
 840         return 0;
 841 }
 842
 843 static void serial_omap_config_port(struct uart_port *port, int flags)
 844 {
 845         struct uart_omap_port *up = (struct uart_omap_port *)port;
 846
 847         dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
 848                                                         up->pdev->id);
 849         up->port.type = PORT_OMAP;
 850 }
 851
 852 static int
 853 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
 854 {
 855         /* we don't want the core code to modify any port params */
 856         dev_dbg(port->dev, "serial_omap_verify_port+\n");
 857         return -EINVAL;
 858 }
 859
 860 static const char *
 861 serial_omap_type(struct uart_port *port)
 862 {
 863         struct uart_omap_port *up = (struct uart_omap_port *)port;
 864
 865         dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id);
 866         return up->name;
 867 }
 868
 869 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
 870
 871 static struct uart_omap_port *serial_omap_console_ports[4];
 872
 873 static struct uart_driver serial_omap_reg;
 874
 875 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 876
 877 static inline void wait_for_xmitr(struct uart_omap_port *up)
 878 {
 879         unsigned int status, tmout = 10000;
 880
 881         /* Wait up to 10ms for the character(s) to be sent. */
 882         do {
 883                 status = serial_in(up, UART_LSR);
 884
 885                 if (status & UART_LSR_BI)
 886                         up->lsr_break_flag = UART_LSR_BI;
 887
 888                 if (--tmout == 0)
 889                         break;
 890                 udelay(1);
 891         } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
 892
 893         /* Wait up to 1s for flow control if necessary */
 894         if (up->port.flags & UPF_CONS_FLOW) {
 895                 tmout = 1000000;
 896                 for (tmout = 1000000; tmout; tmout--) {
 897                         unsigned int msr = serial_in(up, UART_MSR);
 898
 899                         up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
 900                         if (msr & UART_MSR_CTS)
 901                                 break;
 902
 903                         udelay(1);
 904                 }
 905         }
 906 }
 907
 908 static void serial_omap_console_putchar(struct uart_port *port, int ch)
 909 {
 910         struct uart_omap_port *up = (struct uart_omap_port *)port;
 911
 912         wait_for_xmitr(up);
 913         serial_out(up, UART_TX, ch);
 914 }
 915
 916 static void
 917 serial_omap_console_write(struct console *co, const char *s,
 918                 unsigned int count)
 919 {
 920         struct uart_omap_port *up = serial_omap_console_ports[co->index];
 921         unsigned long flags;
 922         unsigned int ier;
 923         int locked = 1;
 924
 925         local_irq_save(flags);
 926         if (up->port.sysrq)
 927                 locked = 0;
 928         else if (oops_in_progress)
 929                 locked = spin_trylock(&up->port.lock);
 930         else
 931                 spin_lock(&up->port.lock);
 932
 933         /*
 934          * First save the IER then disable the interrupts
 935          */
 936         ier = serial_in(up, UART_IER);
 937         serial_out(up, UART_IER, 0);
 938
 939         uart_console_write(&up->port, s, count, serial_omap_console_putchar);
 940
 941         /*
 942          * Finally, wait for transmitter to become empty
 943          * and restore the IER
 944          */
 945         wait_for_xmitr(up);
 946         serial_out(up, UART_IER, ier);
 947         /*
 948          * The receive handling will happen properly because the
 949          * receive ready bit will still be set; it is not cleared
 950          * on read.  However, modem control will not, we must
 951          * call it if we have saved something in the saved flags
 952          * while processing with interrupts off.
 953          */
 954         if (up->msr_saved_flags)
 955                 check_modem_status(up);
 956
 957         if (locked)
 958                 spin_unlock(&up->port.lock);
 959         local_irq_restore(flags);
 960 }
 961
 962 static int __init
 963 serial_omap_console_setup(struct console *co, char *options)
 964 {
 965         struct uart_omap_port *up;
 966         int baud = 115200;
 967         int bits = 8;
 968         int parity = 'n';
 969         int flow = 'n';
 970
 971         if (serial_omap_console_ports[co->index] == NULL)
 972                 return -ENODEV;
 973         up = serial_omap_console_ports[co->index];
 974
 975         if (options)
 976                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 977
 978         return uart_set_options(&up->port, co, baud, parity, bits, flow);
 979 }
 980
 981 static struct console serial_omap_console = {
 982         .name           = OMAP_SERIAL_NAME,
 983         .write          = serial_omap_console_write,
 984         .device         = uart_console_device,
 985         .setup          = serial_omap_console_setup,
 986         .flags          = CON_PRINTBUFFER,
 987         .index          = -1,
 988         .data           = &serial_omap_reg,
 989 };
 990
 991 static void serial_omap_add_console_port(struct uart_omap_port *up)
 992 {
 993         serial_omap_console_ports[up->pdev->id] = up;
 994 }
 995
 996 #define OMAP_CONSOLE    (&serial_omap_console)
 997
 998 #else
 999
1000 #define OMAP_CONSOLE    NULL
1001
1002 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1003 {}
1004
1005 #endif
1006
1007 static struct uart_ops serial_omap_pops = {
1008         .tx_empty       = serial_omap_tx_empty,
1009         .set_mctrl      = serial_omap_set_mctrl,
1010         .get_mctrl      = serial_omap_get_mctrl,
1011         .stop_tx        = serial_omap_stop_tx,
1012         .start_tx       = serial_omap_start_tx,
1013         .stop_rx        = serial_omap_stop_rx,
1014         .enable_ms      = serial_omap_enable_ms,
1015         .break_ctl      = serial_omap_break_ctl,
1016         .startup        = serial_omap_startup,
1017         .shutdown       = serial_omap_shutdown,
1018         .set_termios    = serial_omap_set_termios,
1019         .pm             = serial_omap_pm,
1020         .type           = serial_omap_type,
1021         .release_port   = serial_omap_release_port,
1022         .request_port   = serial_omap_request_port,
1023         .config_port    = serial_omap_config_port,
1024         .verify_port    = serial_omap_verify_port,
1025 };
1026
1027 static struct uart_driver serial_omap_reg = {
1028         .owner          = THIS_MODULE,
1029         .driver_name    = "OMAP-SERIAL",
1030         .dev_name       = OMAP_SERIAL_NAME,
1031         .nr             = OMAP_MAX_HSUART_PORTS,
1032         .cons           = OMAP_CONSOLE,
1033 };
1034
1035 static int
1036 serial_omap_suspend(struct platform_device *pdev, pm_message_t state)
1037 {
1038         struct uart_omap_port *up = platform_get_drvdata(pdev);
1039
1040         if (up)
1041                 uart_suspend_port(&serial_omap_reg, &up->port);
1042         return 0;
1043 }
1044
1045 static int serial_omap_resume(struct platform_device *dev)
1046 {
1047         struct uart_omap_port *up = platform_get_drvdata(dev);
1048
1049         if (up)
1050                 uart_resume_port(&serial_omap_reg, &up->port);
1051         return 0;
1052 }
1053
1054 static void serial_omap_rx_timeout(unsigned long uart_no)
1055 {
1056         struct uart_omap_port *up = ui[uart_no];
1057         unsigned int curr_dma_pos, curr_transmitted_size;
1058         int ret = 0;
1059
1060         curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
1061         if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
1062                              (curr_dma_pos == 0)) {
1063                 if (jiffies_to_msecs(jiffies - up->port_activity) <
1064                                                         RX_TIMEOUT) {
1065                         mod_timer(&up->uart_dma.rx_timer, jiffies +
1066                                 usecs_to_jiffies(up->uart_dma.rx_timeout));
1067                 } else {
1068                         serial_omap_stop_rxdma(up);
1069                         up->ier |= (UART_IER_RDI | UART_IER_RLSI);
1070                         serial_out(up, UART_IER, up->ier);
1071                 }
1072                 return;
1073         }
1074
1075         curr_transmitted_size = curr_dma_pos -
1076                                         up->uart_dma.prev_rx_dma_pos;
1077         up->port.icount.rx += curr_transmitted_size;
1078         tty_insert_flip_string(up->port.state->port.tty,
1079                         up->uart_dma.rx_buf +
1080                         (up->uart_dma.prev_rx_dma_pos -
1081                         up->uart_dma.rx_buf_dma_phys),
1082                         curr_transmitted_size);
1083         tty_flip_buffer_push(up->port.state->port.tty);
1084         up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
1085         if (up->uart_dma.rx_buf_size +
1086                         up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
1087                 ret = serial_omap_start_rxdma(up);
1088                 if (ret < 0) {
1089                         serial_omap_stop_rxdma(up);
1090                         up->ier |= (UART_IER_RDI | UART_IER_RLSI);
1091                         serial_out(up, UART_IER, up->ier);
1092                 }
1093         } else  {
1094                 mod_timer(&up->uart_dma.rx_timer, jiffies +
1095                         usecs_to_jiffies(up->uart_dma.rx_timeout));
1096         }
1097         up->port_activity = jiffies;
1098 }
1099
1100 static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
1101 {
1102         return;
1103 }
1104
1105 static int serial_omap_start_rxdma(struct uart_omap_port *up)
1106 {
1107         int ret = 0;
1108
1109         if (up->uart_dma.rx_dma_channel == -1) {
1110                 ret = omap_request_dma(up->uart_dma.uart_dma_rx,
1111                                 "UART Rx DMA",
1112                                 (void *)uart_rx_dma_callback, up,
1113                                 &(up->uart_dma.rx_dma_channel));
1114                 if (ret < 0)
1115                         return ret;
1116
1117                 omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
1118                                 OMAP_DMA_AMODE_CONSTANT,
1119                                 up->uart_dma.uart_base, 0, 0);
1120                 omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
1121                                 OMAP_DMA_AMODE_POST_INC,
1122                                 up->uart_dma.rx_buf_dma_phys, 0, 0);
1123                 omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
1124                                 OMAP_DMA_DATA_TYPE_S8,
1125                                 up->uart_dma.rx_buf_size, 1,
1126                                 OMAP_DMA_SYNC_ELEMENT,
1127                                 up->uart_dma.uart_dma_rx, 0);
1128         }
1129         up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
1130         /* FIXME: Cache maintenance needed here? */
1131         omap_start_dma(up->uart_dma.rx_dma_channel);
1132         mod_timer(&up->uart_dma.rx_timer, jiffies +
1133                                 usecs_to_jiffies(up->uart_dma.rx_timeout));
1134         up->uart_dma.rx_dma_used = true;
1135         return ret;
1136 }
1137
1138 static void serial_omap_continue_tx(struct uart_omap_port *up)
1139 {
1140         struct circ_buf *xmit = &up->port.state->xmit;
1141         unsigned int start = up->uart_dma.tx_buf_dma_phys
1142                         + (xmit->tail & (UART_XMIT_SIZE - 1));
1143
1144         if (uart_circ_empty(xmit))
1145                 return;
1146
1147         up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
1148         /*
1149          * It is a circular buffer. See if the buffer has wounded back.
1150          * If yes it will have to be transferred in two separate dma
1151          * transfers
1152          */
1153         if (start + up->uart_dma.tx_buf_size >=
1154                         up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
1155                 up->uart_dma.tx_buf_size =
1156                         (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
1157         omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
1158                                 OMAP_DMA_AMODE_CONSTANT,
1159                                 up->uart_dma.uart_base, 0, 0);
1160         omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
1161                                 OMAP_DMA_AMODE_POST_INC, start, 0, 0);
1162         omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
1163                                 OMAP_DMA_DATA_TYPE_S8,
1164                                 up->uart_dma.tx_buf_size, 1,
1165                                 OMAP_DMA_SYNC_ELEMENT,
1166                                 up->uart_dma.uart_dma_tx, 0);
1167         /* FIXME: Cache maintenance needed here? */
1168         omap_start_dma(up->uart_dma.tx_dma_channel);
1169 }
1170
1171 static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
1172 {
1173         struct uart_omap_port *up = (struct uart_omap_port *)data;
1174         struct circ_buf *xmit = &up->port.state->xmit;
1175
1176         xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \
1177                         (UART_XMIT_SIZE - 1);
1178         up->port.icount.tx += up->uart_dma.tx_buf_size;
1179
1180         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1181                 uart_write_wakeup(&up->port);
1182
1183         if (uart_circ_empty(xmit)) {
1184                 spin_lock(&(up->uart_dma.tx_lock));
1185                 serial_omap_stop_tx(&up->port);
1186                 up->uart_dma.tx_dma_used = false;
1187                 spin_unlock(&(up->uart_dma.tx_lock));
1188         } else {
1189                 omap_stop_dma(up->uart_dma.tx_dma_channel);
1190                 serial_omap_continue_tx(up);
1191         }
1192         up->port_activity = jiffies;
1193         return;
1194 }
1195
1196 static int serial_omap_probe(struct platform_device *pdev)
1197 {
1198         struct uart_omap_port   *up;
1199         struct resource         *mem, *irq, *dma_tx, *dma_rx;
1200         struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
1201         int ret = -ENOSPC;
1202
1203         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1204         if (!mem) {
1205                 dev_err(&pdev->dev, "no mem resource?\n");
1206                 return -ENODEV;
1207         }
1208
1209         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1210         if (!irq) {
1211                 dev_err(&pdev->dev, "no irq resource?\n");
1212                 return -ENODEV;
1213         }
1214
1215         if (!request_mem_region(mem->start, (mem->end - mem->start) + 1,
1216                                      pdev->dev.driver->name)) {
1217                 dev_err(&pdev->dev, "memory region already claimed\n");
1218                 return -EBUSY;
1219         }
1220
1221         dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1222         if (!dma_rx) {
1223                 ret = -EINVAL;
1224                 goto err;
1225         }
1226
1227         dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1228         if (!dma_tx) {
1229                 ret = -EINVAL;
1230                 goto err;
1231         }
1232
1233         up = kzalloc(sizeof(*up), GFP_KERNEL);
1234         if (up == NULL) {
1235                 ret = -ENOMEM;
1236                 goto do_release_region;
1237         }
1238         sprintf(up->name, "OMAP UART%d", pdev->id);
1239         up->pdev = pdev;
1240         up->port.dev = &pdev->dev;
1241         up->port.type = PORT_OMAP;
1242         up->port.iotype = UPIO_MEM;
1243         up->port.irq = irq->start;
1244
1245         up->port.regshift = 2;
1246         up->port.fifosize = 64;
1247         up->port.ops = &serial_omap_pops;
1248         up->port.line = pdev->id;
1249
1250         up->port.membase = omap_up_info->membase;
1251         up->port.mapbase = omap_up_info->mapbase;
1252         up->port.flags = omap_up_info->flags;
1253         up->port.irqflags = omap_up_info->irqflags;
1254         up->port.uartclk = omap_up_info->uartclk;
1255         up->uart_dma.uart_base = mem->start;
1256
1257         if (omap_up_info->dma_enabled) {
1258                 up->uart_dma.uart_dma_tx = dma_tx->start;
1259                 up->uart_dma.uart_dma_rx = dma_rx->start;
1260                 up->use_dma = 1;
1261                 up->uart_dma.rx_buf_size = 4096;
1262                 up->uart_dma.rx_timeout = 2;
1263                 spin_lock_init(&(up->uart_dma.tx_lock));
1264                 spin_lock_init(&(up->uart_dma.rx_lock));
1265                 up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
1266                 up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
1267         }
1268
1269         ui[pdev->id] = up;
1270         serial_omap_add_console_port(up);
1271
1272         ret = uart_add_one_port(&serial_omap_reg, &up->port);
1273         if (ret != 0)
1274                 goto do_release_region;
1275
1276         platform_set_drvdata(pdev, up);
1277         return 0;
1278 err:
1279         dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1280                                 pdev->id, __func__, ret);
1281 do_release_region:
1282         release_mem_region(mem->start, (mem->end - mem->start) + 1);
1283         return ret;
1284 }
1285
1286 static int serial_omap_remove(struct platform_device *dev)
1287 {
1288         struct uart_omap_port *up = platform_get_drvdata(dev);
1289
1290         platform_set_drvdata(dev, NULL);
1291         if (up) {
1292                 uart_remove_one_port(&serial_omap_reg, &up->port);
1293                 kfree(up);
1294         }
1295         return 0;
1296 }
1297
1298 static struct platform_driver serial_omap_driver = {
1299         .probe          = serial_omap_probe,
1300         .remove         = serial_omap_remove,
1301
1302         .suspend        = serial_omap_suspend,
1303         .resume         = serial_omap_resume,
1304         .driver         = {
1305                 .name   = DRIVER_NAME,
1306         },
1307 };
1308
1309 static int __init serial_omap_init(void)
1310 {
1311         int ret;
1312
1313         ret = uart_register_driver(&serial_omap_reg);
1314         if (ret != 0)
1315                 return ret;
1316         ret = platform_driver_register(&serial_omap_driver);
1317         if (ret != 0)
1318                 uart_unregister_driver(&serial_omap_reg);
1319         return ret;
1320 }
1321
1322 static void __exit serial_omap_exit(void)
1323 {
1324         platform_driver_unregister(&serial_omap_driver);
1325         uart_unregister_driver(&serial_omap_reg);
1326 }
1327
1328 module_init(serial_omap_init);
1329 module_exit(serial_omap_exit);
1330
1331 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1332 MODULE_LICENSE("GPL");
1333 MODULE_AUTHOR("Texas Instruments Inc");