kernel/drivers/tty/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 separate 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 #if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  24 #define SUPPORT_SYSRQ
  25 #endif
  26
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/console.h>
  30 #include <linux/serial_reg.h>
  31 #include <linux/delay.h>
  32 #include <linux/slab.h>
  33 #include <linux/tty.h>
  34 #include <linux/tty_flip.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/io.h>
  37 #include <linux/clk.h>
  38 #include <linux/serial_core.h>
  39 #include <linux/irq.h>
  40 #include <linux/pm_runtime.h>
  41 #include <linux/pm_wakeirq.h>
  42 #include <linux/of.h>
  43 #include <linux/of_irq.h>
  44 #include <linux/gpio.h>
  45 #include <linux/of_gpio.h>
  46 #include <linux/platform_data/serial-omap.h>
  47
  48 #include <dt-bindings/gpio/gpio.h>
  49
  50 #define OMAP_MAX_HSUART_PORTS   10
  51
  52 #define UART_BUILD_REVISION(x, y)       (((x) << 8) | (y))
  53
  54 #define OMAP_UART_REV_42 0x0402
  55 #define OMAP_UART_REV_46 0x0406
  56 #define OMAP_UART_REV_52 0x0502
  57 #define OMAP_UART_REV_63 0x0603
  58
  59 #define OMAP_UART_TX_WAKEUP_EN          BIT(7)
  60
  61 /* Feature flags */
  62 #define OMAP_UART_WER_HAS_TX_WAKEUP     BIT(0)
  63
  64 #define UART_ERRATA_i202_MDR1_ACCESS    BIT(0)
  65 #define UART_ERRATA_i291_DMA_FORCEIDLE  BIT(1)
  66
  67 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz */
  68
  69 /* SCR register bitmasks */
  70 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK               (1 << 7)
  71 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK               (1 << 6)
  72 #define OMAP_UART_SCR_TX_EMPTY                  (1 << 3)
  73
  74 /* FCR register bitmasks */
  75 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK                 (0x3 << 6)
  76 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK                 (0x3 << 4)
  77
  78 /* MVR register bitmasks */
  79 #define OMAP_UART_MVR_SCHEME_SHIFT      30
  80
  81 #define OMAP_UART_LEGACY_MVR_MAJ_MASK   0xf0
  82 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT  4
  83 #define OMAP_UART_LEGACY_MVR_MIN_MASK   0x0f
  84
  85 #define OMAP_UART_MVR_MAJ_MASK          0x700
  86 #define OMAP_UART_MVR_MAJ_SHIFT         8
  87 #define OMAP_UART_MVR_MIN_MASK          0x3f
  88
  89 #define OMAP_UART_DMA_CH_FREE   -1
  90
  91 #define MSR_SAVE_FLAGS          UART_MSR_ANY_DELTA
  92 #define OMAP_MODE13X_SPEED      230400
  93
  94 /* WER = 0x7F
  95  * Enable module level wakeup in WER reg
  96  */
  97 #define OMAP_UART_WER_MOD_WKUP  0x7F
  98
  99 /* Enable XON/XOFF flow control on output */
 100 #define OMAP_UART_SW_TX         0x08
 101
 102 /* Enable XON/XOFF flow control on input */
 103 #define OMAP_UART_SW_RX         0x02
 104
 105 #define OMAP_UART_SW_CLR        0xF0
 106
 107 #define OMAP_UART_TCR_TRIG      0x0F
 108
 109 struct uart_omap_dma {
 110         u8                      uart_dma_tx;
 111         u8                      uart_dma_rx;
 112         int                     rx_dma_channel;
 113         int                     tx_dma_channel;
 114         dma_addr_t              rx_buf_dma_phys;
 115         dma_addr_t              tx_buf_dma_phys;
 116         unsigned int            uart_base;
 117         /*
 118          * Buffer for rx dma. It is not required for tx because the buffer
 119          * comes from port structure.
 120          */
 121         unsigned char           *rx_buf;
 122         unsigned int            prev_rx_dma_pos;
 123         int                     tx_buf_size;
 124         int                     tx_dma_used;
 125         int                     rx_dma_used;
 126         spinlock_t              tx_lock;
 127         spinlock_t              rx_lock;
 128         /* timer to poll activity on rx dma */
 129         struct timer_list       rx_timer;
 130         unsigned int            rx_buf_size;
 131         unsigned int            rx_poll_rate;
 132         unsigned int            rx_timeout;
 133 };
 134
 135 struct uart_omap_port {
 136         struct uart_port        port;
 137         struct uart_omap_dma    uart_dma;
 138         struct device           *dev;
 139         int                     wakeirq;
 140
 141         unsigned char           ier;
 142         unsigned char           lcr;
 143         unsigned char           mcr;
 144         unsigned char           fcr;
 145         unsigned char           efr;
 146         unsigned char           dll;
 147         unsigned char           dlh;
 148         unsigned char           mdr1;
 149         unsigned char           scr;
 150         unsigned char           wer;
 151
 152         int                     use_dma;
 153         /*
 154          * Some bits in registers are cleared on a read, so they must
 155          * be saved whenever the register is read, but the bits will not
 156          * be immediately processed.
 157          */
 158         unsigned int            lsr_break_flag;
 159         unsigned char           msr_saved_flags;
 160         char                    name[20];
 161         unsigned long           port_activity;
 162         int                     context_loss_cnt;
 163         u32                     errata;
 164         u32                     features;
 165
 166         int                     rts_gpio;
 167
 168         struct pm_qos_request   pm_qos_request;
 169         u32                     latency;
 170         u32                     calc_latency;
 171         struct work_struct      qos_work;
 172         bool                    is_suspending;
 173 };
 174
 175 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
 176
 177 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 178
 179 /* Forward declaration of functions */
 180 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
 181
 182 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
 183 {
 184         offset <<= up->port.regshift;
 185         return readw(up->port.membase + offset);
 186 }
 187
 188 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
 189 {
 190         offset <<= up->port.regshift;
 191         writew(value, up->port.membase + offset);
 192 }
 193
 194 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
 195 {
 196         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 197         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 198                        UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 199         serial_out(up, UART_FCR, 0);
 200 }
 201
 202 #ifdef CONFIG_PM
 203 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
 204 {
 205         struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
 206
 207         if (!pdata || !pdata->get_context_loss_count)
 208                 return -EINVAL;
 209
 210         return pdata->get_context_loss_count(up->dev);
 211 }
 212
 213 /* REVISIT: Remove this when omap3 boots in device tree only mode */
 214 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
 215 {
 216         struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
 217
 218         if (!pdata || !pdata->enable_wakeup)
 219                 return;
 220
 221         pdata->enable_wakeup(up->dev, enable);
 222 }
 223 #endif /* CONFIG_PM */
 224
 225 /*
 226  * Calculate the absolute difference between the desired and actual baud
 227  * rate for the given mode.
 228  */
 229 static inline int calculate_baud_abs_diff(struct uart_port *port,
 230                                 unsigned int baud, unsigned int mode)
 231 {
 232         unsigned int n = port->uartclk / (mode * baud);
 233         int abs_diff;
 234
 235         if (n == 0)
 236                 n = 1;
 237
 238         abs_diff = baud - (port->uartclk / (mode * n));
 239         if (abs_diff < 0)
 240                 abs_diff = -abs_diff;
 241
 242         return abs_diff;
 243 }
 244
 245 /*
 246  * serial_omap_baud_is_mode16 - check if baud rate is MODE16X
 247  * @port: uart port info
 248  * @baud: baudrate for which mode needs to be determined
 249  *
 250  * Returns true if baud rate is MODE16X and false if MODE13X
 251  * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values,
 252  * and Error Rates" determines modes not for all common baud rates.
 253  * E.g. for 1000000 baud rate mode must be 16x, but according to that
 254  * table it's determined as 13x.
 255  */
 256 static bool
 257 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
 258 {
 259         int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13);
 260         int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16);
 261
 262         return (abs_diff_13 >= abs_diff_16);
 263 }
 264
 265 /*
 266  * serial_omap_get_divisor - calculate divisor value
 267  * @port: uart port info
 268  * @baud: baudrate for which divisor needs to be calculated.
 269  */
 270 static unsigned int
 271 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
 272 {
 273         unsigned int mode;
 274
 275         if (!serial_omap_baud_is_mode16(port, baud))
 276                 mode = 13;
 277         else
 278                 mode = 16;
 279         return port->uartclk/(mode * baud);
 280 }
 281
 282 static void serial_omap_enable_ms(struct uart_port *port)
 283 {
 284         struct uart_omap_port *up = to_uart_omap_port(port);
 285
 286         dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
 287
 288         pm_runtime_get_sync(up->dev);
 289         up->ier |= UART_IER_MSI;
 290         serial_out(up, UART_IER, up->ier);
 291         pm_runtime_mark_last_busy(up->dev);
 292         pm_runtime_put_autosuspend(up->dev);
 293 }
 294
 295 static void serial_omap_stop_tx(struct uart_port *port)
 296 {
 297         struct uart_omap_port *up = to_uart_omap_port(port);
 298         int res;
 299
 300         pm_runtime_get_sync(up->dev);
 301
 302         /* Handle RS-485 */
 303         if (port->rs485.flags & SER_RS485_ENABLED) {
 304                 if (up->scr & OMAP_UART_SCR_TX_EMPTY) {
 305                         /* THR interrupt is fired when both TX FIFO and TX
 306                          * shift register are empty. This means there's nothing
 307                          * left to transmit now, so make sure the THR interrupt
 308                          * is fired when TX FIFO is below the trigger level,
 309                          * disable THR interrupts and toggle the RS-485 GPIO
 310                          * data direction pin if needed.
 311                          */
 312                         up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
 313                         serial_out(up, UART_OMAP_SCR, up->scr);
 314                         res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ?
 315                                 1 : 0;
 316                         if (gpio_get_value(up->rts_gpio) != res) {
 317                                 if (port->rs485.delay_rts_after_send > 0)
 318                                         mdelay(
 319                                         port->rs485.delay_rts_after_send);
 320                                 gpio_set_value(up->rts_gpio, res);
 321                         }
 322                 } else {
 323                         /* We're asked to stop, but there's still stuff in the
 324                          * UART FIFO, so make sure the THR interrupt is fired
 325                          * when both TX FIFO and TX shift register are empty.
 326                          * The next THR interrupt (if no transmission is started
 327                          * in the meantime) will indicate the end of a
 328                          * transmission. Therefore we _don't_ disable THR
 329                          * interrupts in this situation.
 330                          */
 331                         up->scr |= OMAP_UART_SCR_TX_EMPTY;
 332                         serial_out(up, UART_OMAP_SCR, up->scr);
 333                         return;
 334                 }
 335         }
 336
 337         if (up->ier & UART_IER_THRI) {
 338                 up->ier &= ~UART_IER_THRI;
 339                 serial_out(up, UART_IER, up->ier);
 340         }
 341
 342         if ((port->rs485.flags & SER_RS485_ENABLED) &&
 343             !(port->rs485.flags & SER_RS485_RX_DURING_TX)) {
 344                 /*
 345                  * Empty the RX FIFO, we are not interested in anything
 346                  * received during the half-duplex transmission.
 347                  */
 348                 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_RCVR);
 349                 /* Re-enable RX interrupts */
 350                 up->ier |= UART_IER_RLSI | UART_IER_RDI;
 351                 up->port.read_status_mask |= UART_LSR_DR;
 352                 serial_out(up, UART_IER, up->ier);
 353         }
 354
 355         pm_runtime_mark_last_busy(up->dev);
 356         pm_runtime_put_autosuspend(up->dev);
 357 }
 358
 359 static void serial_omap_stop_rx(struct uart_port *port)
 360 {
 361         struct uart_omap_port *up = to_uart_omap_port(port);
 362
 363         pm_runtime_get_sync(up->dev);
 364         up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
 365         up->port.read_status_mask &= ~UART_LSR_DR;
 366         serial_out(up, UART_IER, up->ier);
 367         pm_runtime_mark_last_busy(up->dev);
 368         pm_runtime_put_autosuspend(up->dev);
 369 }
 370
 371 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
 372 {
 373         struct circ_buf *xmit = &up->port.state->xmit;
 374         int count;
 375
 376         if (up->port.x_char) {
 377                 serial_out(up, UART_TX, up->port.x_char);
 378                 up->port.icount.tx++;
 379                 up->port.x_char = 0;
 380                 return;
 381         }
 382         if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
 383                 serial_omap_stop_tx(&up->port);
 384                 return;
 385         }
 386         count = up->port.fifosize / 4;
 387         do {
 388                 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
 389                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 390                 up->port.icount.tx++;
 391                 if (uart_circ_empty(xmit))
 392                         break;
 393         } while (--count > 0);
 394
 395         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 396                 uart_write_wakeup(&up->port);
 397
 398         if (uart_circ_empty(xmit))
 399                 serial_omap_stop_tx(&up->port);
 400 }
 401
 402 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
 403 {
 404         if (!(up->ier & UART_IER_THRI)) {
 405                 up->ier |= UART_IER_THRI;
 406                 serial_out(up, UART_IER, up->ier);
 407         }
 408 }
 409
 410 static void serial_omap_start_tx(struct uart_port *port)
 411 {
 412         struct uart_omap_port *up = to_uart_omap_port(port);
 413         int res;
 414
 415         pm_runtime_get_sync(up->dev);
 416
 417         /* Handle RS-485 */
 418         if (port->rs485.flags & SER_RS485_ENABLED) {
 419                 /* Fire THR interrupts when FIFO is below trigger level */
 420                 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
 421                 serial_out(up, UART_OMAP_SCR, up->scr);
 422
 423                 /* if rts not already enabled */
 424                 res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
 425                 if (gpio_get_value(up->rts_gpio) != res) {
 426                         gpio_set_value(up->rts_gpio, res);
 427                         if (port->rs485.delay_rts_before_send > 0)
 428                                 mdelay(port->rs485.delay_rts_before_send);
 429                 }
 430         }
 431
 432         if ((port->rs485.flags & SER_RS485_ENABLED) &&
 433             !(port->rs485.flags & SER_RS485_RX_DURING_TX))
 434                 serial_omap_stop_rx(port);
 435
 436         serial_omap_enable_ier_thri(up);
 437         pm_runtime_mark_last_busy(up->dev);
 438         pm_runtime_put_autosuspend(up->dev);
 439 }
 440
 441 static void serial_omap_throttle(struct uart_port *port)
 442 {
 443         struct uart_omap_port *up = to_uart_omap_port(port);
 444         unsigned long flags;
 445
 446         pm_runtime_get_sync(up->dev);
 447         spin_lock_irqsave(&up->port.lock, flags);
 448         up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
 449         serial_out(up, UART_IER, up->ier);
 450         spin_unlock_irqrestore(&up->port.lock, flags);
 451         pm_runtime_mark_last_busy(up->dev);
 452         pm_runtime_put_autosuspend(up->dev);
 453 }
 454
 455 static void serial_omap_unthrottle(struct uart_port *port)
 456 {
 457         struct uart_omap_port *up = to_uart_omap_port(port);
 458         unsigned long flags;
 459
 460         pm_runtime_get_sync(up->dev);
 461         spin_lock_irqsave(&up->port.lock, flags);
 462         up->ier |= UART_IER_RLSI | UART_IER_RDI;
 463         serial_out(up, UART_IER, up->ier);
 464         spin_unlock_irqrestore(&up->port.lock, flags);
 465         pm_runtime_mark_last_busy(up->dev);
 466         pm_runtime_put_autosuspend(up->dev);
 467 }
 468
 469 static unsigned int check_modem_status(struct uart_omap_port *up)
 470 {
 471         unsigned int status;
 472
 473         status = serial_in(up, UART_MSR);
 474         status |= up->msr_saved_flags;
 475         up->msr_saved_flags = 0;
 476         if ((status & UART_MSR_ANY_DELTA) == 0)
 477                 return status;
 478
 479         if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
 480             up->port.state != NULL) {
 481                 if (status & UART_MSR_TERI)
 482                         up->port.icount.rng++;
 483                 if (status & UART_MSR_DDSR)
 484                         up->port.icount.dsr++;
 485                 if (status & UART_MSR_DDCD)
 486                         uart_handle_dcd_change
 487                                 (&up->port, status & UART_MSR_DCD);
 488                 if (status & UART_MSR_DCTS)
 489                         uart_handle_cts_change
 490                                 (&up->port, status & UART_MSR_CTS);
 491                 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 492         }
 493
 494         return status;
 495 }
 496
 497 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
 498 {
 499         unsigned int flag;
 500         unsigned char ch = 0;
 501
 502         if (likely(lsr & UART_LSR_DR))
 503                 ch = serial_in(up, UART_RX);
 504
 505         up->port.icount.rx++;
 506         flag = TTY_NORMAL;
 507
 508         if (lsr & UART_LSR_BI) {
 509                 flag = TTY_BREAK;
 510                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 511                 up->port.icount.brk++;
 512                 /*
 513                  * We do the SysRQ and SAK checking
 514                  * here because otherwise the break
 515                  * may get masked by ignore_status_mask
 516                  * or read_status_mask.
 517                  */
 518                 if (uart_handle_break(&up->port))
 519                         return;
 520
 521         }
 522
 523         if (lsr & UART_LSR_PE) {
 524                 flag = TTY_PARITY;
 525                 up->port.icount.parity++;
 526         }
 527
 528         if (lsr & UART_LSR_FE) {
 529                 flag = TTY_FRAME;
 530                 up->port.icount.frame++;
 531         }
 532
 533         if (lsr & UART_LSR_OE)
 534                 up->port.icount.overrun++;
 535
 536 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
 537         if (up->port.line == up->port.cons->index) {
 538                 /* Recover the break flag from console xmit */
 539                 lsr |= up->lsr_break_flag;
 540         }
 541 #endif
 542         uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
 543 }
 544
 545 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
 546 {
 547         unsigned char ch = 0;
 548         unsigned int flag;
 549
 550         if (!(lsr & UART_LSR_DR))
 551                 return;
 552
 553         ch = serial_in(up, UART_RX);
 554         flag = TTY_NORMAL;
 555         up->port.icount.rx++;
 556
 557         if (uart_handle_sysrq_char(&up->port, ch))
 558                 return;
 559
 560         uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
 561 }
 562
 563 /**
 564  * serial_omap_irq() - This handles the interrupt from one port
 565  * @irq: uart port irq number
 566  * @dev_id: uart port info
 567  */
 568 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
 569 {
 570         struct uart_omap_port *up = dev_id;
 571         unsigned int iir, lsr;
 572         unsigned int type;
 573         irqreturn_t ret = IRQ_NONE;
 574         int max_count = 256;
 575
 576         spin_lock(&up->port.lock);
 577         pm_runtime_get_sync(up->dev);
 578
 579         do {
 580                 iir = serial_in(up, UART_IIR);
 581                 if (iir & UART_IIR_NO_INT)
 582                         break;
 583
 584                 ret = IRQ_HANDLED;
 585                 lsr = serial_in(up, UART_LSR);
 586
 587                 /* extract IRQ type from IIR register */
 588                 type = iir & 0x3e;
 589
 590                 switch (type) {
 591                 case UART_IIR_MSI:
 592                         check_modem_status(up);
 593                         break;
 594                 case UART_IIR_THRI:
 595                         transmit_chars(up, lsr);
 596                         break;
 597                 case UART_IIR_RX_TIMEOUT:
 598                         /* FALLTHROUGH */
 599                 case UART_IIR_RDI:
 600                         serial_omap_rdi(up, lsr);
 601                         break;
 602                 case UART_IIR_RLSI:
 603                         serial_omap_rlsi(up, lsr);
 604                         break;
 605                 case UART_IIR_CTS_RTS_DSR:
 606                         /* simply try again */
 607                         break;
 608                 case UART_IIR_XOFF:
 609                         /* FALLTHROUGH */
 610                 default:
 611                         break;
 612                 }
 613         } while (!(iir & UART_IIR_NO_INT) && max_count--);
 614
 615         spin_unlock(&up->port.lock);
 616
 617         tty_flip_buffer_push(&up->port.state->port);
 618
 619         pm_runtime_mark_last_busy(up->dev);
 620         pm_runtime_put_autosuspend(up->dev);
 621         up->port_activity = jiffies;
 622
 623         return ret;
 624 }
 625
 626 static unsigned int serial_omap_tx_empty(struct uart_port *port)
 627 {
 628         struct uart_omap_port *up = to_uart_omap_port(port);
 629         unsigned long flags = 0;
 630         unsigned int ret = 0;
 631
 632         pm_runtime_get_sync(up->dev);
 633         dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
 634         spin_lock_irqsave(&up->port.lock, flags);
 635         ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
 636         spin_unlock_irqrestore(&up->port.lock, flags);
 637         pm_runtime_mark_last_busy(up->dev);
 638         pm_runtime_put_autosuspend(up->dev);
 639         return ret;
 640 }
 641
 642 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
 643 {
 644         struct uart_omap_port *up = to_uart_omap_port(port);
 645         unsigned int status;
 646         unsigned int ret = 0;
 647
 648         pm_runtime_get_sync(up->dev);
 649         status = check_modem_status(up);
 650         pm_runtime_mark_last_busy(up->dev);
 651         pm_runtime_put_autosuspend(up->dev);
 652
 653         dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
 654
 655         if (status & UART_MSR_DCD)
 656                 ret |= TIOCM_CAR;
 657         if (status & UART_MSR_RI)
 658                 ret |= TIOCM_RNG;
 659         if (status & UART_MSR_DSR)
 660                 ret |= TIOCM_DSR;
 661         if (status & UART_MSR_CTS)
 662                 ret |= TIOCM_CTS;
 663         return ret;
 664 }
 665
 666 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
 667 {
 668         struct uart_omap_port *up = to_uart_omap_port(port);
 669         unsigned char mcr = 0, old_mcr, lcr;
 670
 671         dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
 672         if (mctrl & TIOCM_RTS)
 673                 mcr |= UART_MCR_RTS;
 674         if (mctrl & TIOCM_DTR)
 675                 mcr |= UART_MCR_DTR;
 676         if (mctrl & TIOCM_OUT1)
 677                 mcr |= UART_MCR_OUT1;
 678         if (mctrl & TIOCM_OUT2)
 679                 mcr |= UART_MCR_OUT2;
 680         if (mctrl & TIOCM_LOOP)
 681                 mcr |= UART_MCR_LOOP;
 682
 683         pm_runtime_get_sync(up->dev);
 684         old_mcr = serial_in(up, UART_MCR);
 685         old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 |
 686                      UART_MCR_DTR | UART_MCR_RTS);
 687         up->mcr = old_mcr | mcr;
 688         serial_out(up, UART_MCR, up->mcr);
 689
 690         /* Turn off autoRTS if RTS is lowered; restore autoRTS if RTS raised */
 691         lcr = serial_in(up, UART_LCR);
 692         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 693         if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
 694                 up->efr |= UART_EFR_RTS;
 695         else
 696                 up->efr &= UART_EFR_RTS;
 697         serial_out(up, UART_EFR, up->efr);
 698         serial_out(up, UART_LCR, lcr);
 699
 700         pm_runtime_mark_last_busy(up->dev);
 701         pm_runtime_put_autosuspend(up->dev);
 702 }
 703
 704 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
 705 {
 706         struct uart_omap_port *up = to_uart_omap_port(port);
 707         unsigned long flags = 0;
 708
 709         dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
 710         pm_runtime_get_sync(up->dev);
 711         spin_lock_irqsave(&up->port.lock, flags);
 712         if (break_state == -1)
 713                 up->lcr |= UART_LCR_SBC;
 714         else
 715                 up->lcr &= ~UART_LCR_SBC;
 716         serial_out(up, UART_LCR, up->lcr);
 717         spin_unlock_irqrestore(&up->port.lock, flags);
 718         pm_runtime_mark_last_busy(up->dev);
 719         pm_runtime_put_autosuspend(up->dev);
 720 }
 721
 722 static int serial_omap_startup(struct uart_port *port)
 723 {
 724         struct uart_omap_port *up = to_uart_omap_port(port);
 725         unsigned long flags = 0;
 726         int retval;
 727
 728         /*
 729          * Allocate the IRQ
 730          */
 731         retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
 732                                 up->name, up);
 733         if (retval)
 734                 return retval;
 735
 736         /* Optional wake-up IRQ */
 737         if (up->wakeirq) {
 738                 retval = dev_pm_set_dedicated_wake_irq(up->dev, up->wakeirq);
 739                 if (retval) {
 740                         free_irq(up->port.irq, up);
 741                         return retval;
 742                 }
 743         }
 744
 745         dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
 746
 747         pm_runtime_get_sync(up->dev);
 748         /*
 749          * Clear the FIFO buffers and disable them.
 750          * (they will be reenabled in set_termios())
 751          */
 752         serial_omap_clear_fifos(up);
 753
 754         /*
 755          * Clear the interrupt registers.
 756          */
 757         (void) serial_in(up, UART_LSR);
 758         if (serial_in(up, UART_LSR) & UART_LSR_DR)
 759                 (void) serial_in(up, UART_RX);
 760         (void) serial_in(up, UART_IIR);
 761         (void) serial_in(up, UART_MSR);
 762
 763         /*
 764          * Now, initialize the UART
 765          */
 766         serial_out(up, UART_LCR, UART_LCR_WLEN8);
 767         spin_lock_irqsave(&up->port.lock, flags);
 768         /*
 769          * Most PC uarts need OUT2 raised to enable interrupts.
 770          */
 771         up->port.mctrl |= TIOCM_OUT2;
 772         serial_omap_set_mctrl(&up->port, up->port.mctrl);
 773         spin_unlock_irqrestore(&up->port.lock, flags);
 774
 775         up->msr_saved_flags = 0;
 776         /*
 777          * Finally, enable interrupts. Note: Modem status interrupts
 778          * are set via set_termios(), which will be occurring imminently
 779          * anyway, so we don't enable them here.
 780          */
 781         up->ier = UART_IER_RLSI | UART_IER_RDI;
 782         serial_out(up, UART_IER, up->ier);
 783
 784         /* Enable module level wake up */
 785         up->wer = OMAP_UART_WER_MOD_WKUP;
 786         if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP)
 787                 up->wer |= OMAP_UART_TX_WAKEUP_EN;
 788
 789         serial_out(up, UART_OMAP_WER, up->wer);
 790
 791         pm_runtime_mark_last_busy(up->dev);
 792         pm_runtime_put_autosuspend(up->dev);
 793         up->port_activity = jiffies;
 794         return 0;
 795 }
 796
 797 static void serial_omap_shutdown(struct uart_port *port)
 798 {
 799         struct uart_omap_port *up = to_uart_omap_port(port);
 800         unsigned long flags = 0;
 801
 802         dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
 803
 804         pm_runtime_get_sync(up->dev);
 805         /*
 806          * Disable interrupts from this port
 807          */
 808         up->ier = 0;
 809         serial_out(up, UART_IER, 0);
 810
 811         spin_lock_irqsave(&up->port.lock, flags);
 812         up->port.mctrl &= ~TIOCM_OUT2;
 813         serial_omap_set_mctrl(&up->port, up->port.mctrl);
 814         spin_unlock_irqrestore(&up->port.lock, flags);
 815
 816         /*
 817          * Disable break condition and FIFOs
 818          */
 819         serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
 820         serial_omap_clear_fifos(up);
 821
 822         /*
 823          * Read data port to reset things, and then free the irq
 824          */
 825         if (serial_in(up, UART_LSR) & UART_LSR_DR)
 826                 (void) serial_in(up, UART_RX);
 827
 828         pm_runtime_mark_last_busy(up->dev);
 829         pm_runtime_put_autosuspend(up->dev);
 830         free_irq(up->port.irq, up);
 831         dev_pm_clear_wake_irq(up->dev);
 832 }
 833
 834 static void serial_omap_uart_qos_work(struct work_struct *work)
 835 {
 836         struct uart_omap_port *up = container_of(work, struct uart_omap_port,
 837                                                 qos_work);
 838
 839         pm_qos_update_request(&up->pm_qos_request, up->latency);
 840 }
 841
 842 static void
 843 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 844                         struct ktermios *old)
 845 {
 846         struct uart_omap_port *up = to_uart_omap_port(port);
 847         unsigned char cval = 0;
 848         unsigned long flags = 0;
 849         unsigned int baud, quot;
 850
 851         switch (termios->c_cflag & CSIZE) {
 852         case CS5:
 853                 cval = UART_LCR_WLEN5;
 854                 break;
 855         case CS6:
 856                 cval = UART_LCR_WLEN6;
 857                 break;
 858         case CS7:
 859                 cval = UART_LCR_WLEN7;
 860                 break;
 861         default:
 862         case CS8:
 863                 cval = UART_LCR_WLEN8;
 864                 break;
 865         }
 866
 867         if (termios->c_cflag & CSTOPB)
 868                 cval |= UART_LCR_STOP;
 869         if (termios->c_cflag & PARENB)
 870                 cval |= UART_LCR_PARITY;
 871         if (!(termios->c_cflag & PARODD))
 872                 cval |= UART_LCR_EPAR;
 873         if (termios->c_cflag & CMSPAR)
 874                 cval |= UART_LCR_SPAR;
 875
 876         /*
 877          * Ask the core to calculate the divisor for us.
 878          */
 879
 880         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
 881         quot = serial_omap_get_divisor(port, baud);
 882
 883         /* calculate wakeup latency constraint */
 884         up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
 885         up->latency = up->calc_latency;
 886         schedule_work(&up->qos_work);
 887
 888         up->dll = quot & 0xff;
 889         up->dlh = quot >> 8;
 890         up->mdr1 = UART_OMAP_MDR1_DISABLE;
 891
 892         up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
 893                         UART_FCR_ENABLE_FIFO;
 894
 895         /*
 896          * Ok, we're now changing the port state. Do it with
 897          * interrupts disabled.
 898          */
 899         pm_runtime_get_sync(up->dev);
 900         spin_lock_irqsave(&up->port.lock, flags);
 901
 902         /*
 903          * Update the per-port timeout.
 904          */
 905         uart_update_timeout(port, termios->c_cflag, baud);
 906
 907         up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 908         if (termios->c_iflag & INPCK)
 909                 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 910         if (termios->c_iflag & (BRKINT | PARMRK))
 911                 up->port.read_status_mask |= UART_LSR_BI;
 912
 913         /*
 914          * Characters to ignore
 915          */
 916         up->port.ignore_status_mask = 0;
 917         if (termios->c_iflag & IGNPAR)
 918                 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 919         if (termios->c_iflag & IGNBRK) {
 920                 up->port.ignore_status_mask |= UART_LSR_BI;
 921                 /*
 922                  * If we're ignoring parity and break indicators,
 923                  * ignore overruns too (for real raw support).
 924                  */
 925                 if (termios->c_iflag & IGNPAR)
 926                         up->port.ignore_status_mask |= UART_LSR_OE;
 927         }
 928
 929         /*
 930          * ignore all characters if CREAD is not set
 931          */
 932         if ((termios->c_cflag & CREAD) == 0)
 933                 up->port.ignore_status_mask |= UART_LSR_DR;
 934
 935         /*
 936          * Modem status interrupts
 937          */
 938         up->ier &= ~UART_IER_MSI;
 939         if (UART_ENABLE_MS(&up->port, termios->c_cflag))
 940                 up->ier |= UART_IER_MSI;
 941         serial_out(up, UART_IER, up->ier);
 942         serial_out(up, UART_LCR, cval);         /* reset DLAB */
 943         up->lcr = cval;
 944         up->scr = 0;
 945
 946         /* FIFOs and DMA Settings */
 947
 948         /* FCR can be changed only when the
 949          * baud clock is not running
 950          * DLL_REG and DLH_REG set to 0.
 951          */
 952         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
 953         serial_out(up, UART_DLL, 0);
 954         serial_out(up, UART_DLM, 0);
 955         serial_out(up, UART_LCR, 0);
 956
 957         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 958
 959         up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB;
 960         up->efr &= ~UART_EFR_SCD;
 961         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
 962
 963         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
 964         up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR;
 965         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
 966         /* FIFO ENABLE, DMA MODE */
 967
 968         up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
 969         /*
 970          * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK
 971          * sets Enables the granularity of 1 for TRIGGER RX
 972          * level. Along with setting RX FIFO trigger level
 973          * to 1 (as noted below, 16 characters) and TLR[3:0]
 974          * to zero this will result RX FIFO threshold level
 975          * to 1 character, instead of 16 as noted in comment
 976          * below.
 977          */
 978
 979         /* Set receive FIFO threshold to 16 characters and
 980          * transmit FIFO threshold to 32 spaces
 981          */
 982         up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
 983         up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
 984         up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
 985                 UART_FCR_ENABLE_FIFO;
 986
 987         serial_out(up, UART_FCR, up->fcr);
 988         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 989
 990         serial_out(up, UART_OMAP_SCR, up->scr);
 991
 992         /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */
 993         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
 994         serial_out(up, UART_MCR, up->mcr);
 995         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 996         serial_out(up, UART_EFR, up->efr);
 997         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
 998
 999         /* Protocol, Baud Rate, and Interrupt Settings */
1000
1001         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1002                 serial_omap_mdr1_errataset(up, up->mdr1);
1003         else
1004                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1005
1006         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1007         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1008
1009         serial_out(up, UART_LCR, 0);
1010         serial_out(up, UART_IER, 0);
1011         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1012
1013         serial_out(up, UART_DLL, up->dll);      /* LS of divisor */
1014         serial_out(up, UART_DLM, up->dlh);      /* MS of divisor */
1015
1016         serial_out(up, UART_LCR, 0);
1017         serial_out(up, UART_IER, up->ier);
1018         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1019
1020         serial_out(up, UART_EFR, up->efr);
1021         serial_out(up, UART_LCR, cval);
1022
1023         if (!serial_omap_baud_is_mode16(port, baud))
1024                 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
1025         else
1026                 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
1027
1028         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1029                 serial_omap_mdr1_errataset(up, up->mdr1);
1030         else
1031                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1032
1033         /* Configure flow control */
1034         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1035
1036         /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */
1037         serial_out(up, UART_XON1, termios->c_cc[VSTART]);
1038         serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
1039
1040         /* Enable access to TCR/TLR */
1041         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1042         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1043         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
1044
1045         serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
1046
1047         up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
1048
1049         if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
1050                 /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */
1051                 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
1052                 up->efr |= UART_EFR_CTS;
1053         } else {
1054                 /* Disable AUTORTS and AUTOCTS */
1055                 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS);
1056         }
1057
1058         if (up->port.flags & UPF_SOFT_FLOW) {
1059                 /* clear SW control mode bits */
1060                 up->efr &= OMAP_UART_SW_CLR;
1061
1062                 /*
1063                  * IXON Flag:
1064                  * Enable XON/XOFF flow control on input.
1065                  * Receiver compares XON1, XOFF1.
1066                  */
1067                 if (termios->c_iflag & IXON)
1068                         up->efr |= OMAP_UART_SW_RX;
1069
1070                 /*
1071                  * IXOFF Flag:
1072                  * Enable XON/XOFF flow control on output.
1073                  * Transmit XON1, XOFF1
1074                  */
1075                 if (termios->c_iflag & IXOFF) {
1076                         up->port.status |= UPSTAT_AUTOXOFF;
1077                         up->efr |= OMAP_UART_SW_TX;
1078                 }
1079
1080                 /*
1081                  * IXANY Flag:
1082                  * Enable any character to restart output.
1083                  * Operation resumes after receiving any
1084                  * character after recognition of the XOFF character
1085                  */
1086                 if (termios->c_iflag & IXANY)
1087                         up->mcr |= UART_MCR_XONANY;
1088                 else
1089                         up->mcr &= ~UART_MCR_XONANY;
1090         }
1091         serial_out(up, UART_MCR, up->mcr);
1092         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1093         serial_out(up, UART_EFR, up->efr);
1094         serial_out(up, UART_LCR, up->lcr);
1095
1096         serial_omap_set_mctrl(&up->port, up->port.mctrl);
1097
1098         spin_unlock_irqrestore(&up->port.lock, flags);
1099         pm_runtime_mark_last_busy(up->dev);
1100         pm_runtime_put_autosuspend(up->dev);
1101         dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
1102 }
1103
1104 static void
1105 serial_omap_pm(struct uart_port *port, unsigned int state,
1106                unsigned int oldstate)
1107 {
1108         struct uart_omap_port *up = to_uart_omap_port(port);
1109         unsigned char efr;
1110
1111         dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
1112
1113         pm_runtime_get_sync(up->dev);
1114         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1115         efr = serial_in(up, UART_EFR);
1116         serial_out(up, UART_EFR, efr | UART_EFR_ECB);
1117         serial_out(up, UART_LCR, 0);
1118
1119         serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
1120         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1121         serial_out(up, UART_EFR, efr);
1122         serial_out(up, UART_LCR, 0);
1123
1124         pm_runtime_mark_last_busy(up->dev);
1125         pm_runtime_put_autosuspend(up->dev);
1126 }
1127
1128 static void serial_omap_release_port(struct uart_port *port)
1129 {
1130         dev_dbg(port->dev, "serial_omap_release_port+\n");
1131 }
1132
1133 static int serial_omap_request_port(struct uart_port *port)
1134 {
1135         dev_dbg(port->dev, "serial_omap_request_port+\n");
1136         return 0;
1137 }
1138
1139 static void serial_omap_config_port(struct uart_port *port, int flags)
1140 {
1141         struct uart_omap_port *up = to_uart_omap_port(port);
1142
1143         dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
1144                                                         up->port.line);
1145         up->port.type = PORT_OMAP;
1146         up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW;
1147 }
1148
1149 static int
1150 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
1151 {
1152         /* we don't want the core code to modify any port params */
1153         dev_dbg(port->dev, "serial_omap_verify_port+\n");
1154         return -EINVAL;
1155 }
1156
1157 static const char *
1158 serial_omap_type(struct uart_port *port)
1159 {
1160         struct uart_omap_port *up = to_uart_omap_port(port);
1161
1162         dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
1163         return up->name;
1164 }
1165
1166 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1167
1168 static inline void wait_for_xmitr(struct uart_omap_port *up)
1169 {
1170         unsigned int status, tmout = 10000;
1171
1172         /* Wait up to 10ms for the character(s) to be sent. */
1173         do {
1174                 status = serial_in(up, UART_LSR);
1175
1176                 if (status & UART_LSR_BI)
1177                         up->lsr_break_flag = UART_LSR_BI;
1178
1179                 if (--tmout == 0)
1180                         break;
1181                 udelay(1);
1182         } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1183
1184         /* Wait up to 1s for flow control if necessary */
1185         if (up->port.flags & UPF_CONS_FLOW) {
1186                 tmout = 1000000;
1187                 for (tmout = 1000000; tmout; tmout--) {
1188                         unsigned int msr = serial_in(up, UART_MSR);
1189
1190                         up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1191                         if (msr & UART_MSR_CTS)
1192                                 break;
1193
1194                         udelay(1);
1195                 }
1196         }
1197 }
1198
1199 #ifdef CONFIG_CONSOLE_POLL
1200
1201 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1202 {
1203         struct uart_omap_port *up = to_uart_omap_port(port);
1204
1205         pm_runtime_get_sync(up->dev);
1206         wait_for_xmitr(up);
1207         serial_out(up, UART_TX, ch);
1208         pm_runtime_mark_last_busy(up->dev);
1209         pm_runtime_put_autosuspend(up->dev);
1210 }
1211
1212 static int serial_omap_poll_get_char(struct uart_port *port)
1213 {
1214         struct uart_omap_port *up = to_uart_omap_port(port);
1215         unsigned int status;
1216
1217         pm_runtime_get_sync(up->dev);
1218         status = serial_in(up, UART_LSR);
1219         if (!(status & UART_LSR_DR)) {
1220                 status = NO_POLL_CHAR;
1221                 goto out;
1222         }
1223
1224         status = serial_in(up, UART_RX);
1225
1226 out:
1227         pm_runtime_mark_last_busy(up->dev);
1228         pm_runtime_put_autosuspend(up->dev);
1229
1230         return status;
1231 }
1232
1233 #endif /* CONFIG_CONSOLE_POLL */
1234
1235 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1236
1237 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
1238
1239 static struct uart_driver serial_omap_reg;
1240
1241 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1242 {
1243         struct uart_omap_port *up = to_uart_omap_port(port);
1244
1245         wait_for_xmitr(up);
1246         serial_out(up, UART_TX, ch);
1247 }
1248
1249 static void
1250 serial_omap_console_write(struct console *co, const char *s,
1251                 unsigned int count)
1252 {
1253         struct uart_omap_port *up = serial_omap_console_ports[co->index];
1254         unsigned long flags;
1255         unsigned int ier;
1256         int locked = 1;
1257
1258         pm_runtime_get_sync(up->dev);
1259
1260         if (up->port.sysrq || oops_in_progress)
1261                 locked = spin_trylock_irqsave(&up->port.lock, flags);
1262         else
1263                 spin_lock_irqsave(&up->port.lock, flags);
1264
1265         /*
1266          * First save the IER then disable the interrupts
1267          */
1268         ier = serial_in(up, UART_IER);
1269         serial_out(up, UART_IER, 0);
1270
1271         uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1272
1273         /*
1274          * Finally, wait for transmitter to become empty
1275          * and restore the IER
1276          */
1277         wait_for_xmitr(up);
1278         serial_out(up, UART_IER, ier);
1279         /*
1280          * The receive handling will happen properly because the
1281          * receive ready bit will still be set; it is not cleared
1282          * on read.  However, modem control will not, we must
1283          * call it if we have saved something in the saved flags
1284          * while processing with interrupts off.
1285          */
1286         if (up->msr_saved_flags)
1287                 check_modem_status(up);
1288
1289         pm_runtime_mark_last_busy(up->dev);
1290         pm_runtime_put_autosuspend(up->dev);
1291         if (locked)
1292                 spin_unlock_irqrestore(&up->port.lock, flags);
1293 }
1294
1295 static int __init
1296 serial_omap_console_setup(struct console *co, char *options)
1297 {
1298         struct uart_omap_port *up;
1299         int baud = 115200;
1300         int bits = 8;
1301         int parity = 'n';
1302         int flow = 'n';
1303
1304         if (serial_omap_console_ports[co->index] == NULL)
1305                 return -ENODEV;
1306         up = serial_omap_console_ports[co->index];
1307
1308         if (options)
1309                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1310
1311         return uart_set_options(&up->port, co, baud, parity, bits, flow);
1312 }
1313
1314 static struct console serial_omap_console = {
1315         .name           = OMAP_SERIAL_NAME,
1316         .write          = serial_omap_console_write,
1317         .device         = uart_console_device,
1318         .setup          = serial_omap_console_setup,
1319         .flags          = CON_PRINTBUFFER,
1320         .index          = -1,
1321         .data           = &serial_omap_reg,
1322 };
1323
1324 static void serial_omap_add_console_port(struct uart_omap_port *up)
1325 {
1326         serial_omap_console_ports[up->port.line] = up;
1327 }
1328
1329 #define OMAP_CONSOLE    (&serial_omap_console)
1330
1331 #else
1332
1333 #define OMAP_CONSOLE    NULL
1334
1335 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1336 {}
1337
1338 #endif
1339
1340 /* Enable or disable the rs485 support */
1341 static int
1342 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
1343 {
1344         struct uart_omap_port *up = to_uart_omap_port(port);
1345         unsigned int mode;
1346         int val;
1347
1348         pm_runtime_get_sync(up->dev);
1349
1350         /* Disable interrupts from this port */
1351         mode = up->ier;
1352         up->ier = 0;
1353         serial_out(up, UART_IER, 0);
1354
1355         /* Clamp the delays to [0, 100ms] */
1356         rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
1357         rs485->delay_rts_after_send  = min(rs485->delay_rts_after_send, 100U);
1358
1359         /* store new config */
1360         port->rs485 = *rs485;
1361
1362         /*
1363          * Just as a precaution, only allow rs485
1364          * to be enabled if the gpio pin is valid
1365          */
1366         if (gpio_is_valid(up->rts_gpio)) {
1367                 /* enable / disable rts */
1368                 val = (port->rs485.flags & SER_RS485_ENABLED) ?
1369                         SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
1370                 val = (port->rs485.flags & val) ? 1 : 0;
1371                 gpio_set_value(up->rts_gpio, val);
1372         } else
1373                 port->rs485.flags &= ~SER_RS485_ENABLED;
1374
1375         /* Enable interrupts */
1376         up->ier = mode;
1377         serial_out(up, UART_IER, up->ier);
1378
1379         /* If RS-485 is disabled, make sure the THR interrupt is fired when
1380          * TX FIFO is below the trigger level.
1381          */
1382         if (!(port->rs485.flags & SER_RS485_ENABLED) &&
1383             (up->scr & OMAP_UART_SCR_TX_EMPTY)) {
1384                 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
1385                 serial_out(up, UART_OMAP_SCR, up->scr);
1386         }
1387
1388         pm_runtime_mark_last_busy(up->dev);
1389         pm_runtime_put_autosuspend(up->dev);
1390
1391         return 0;
1392 }
1393
1394 static struct uart_ops serial_omap_pops = {
1395         .tx_empty       = serial_omap_tx_empty,
1396         .set_mctrl      = serial_omap_set_mctrl,
1397         .get_mctrl      = serial_omap_get_mctrl,
1398         .stop_tx        = serial_omap_stop_tx,
1399         .start_tx       = serial_omap_start_tx,
1400         .throttle       = serial_omap_throttle,
1401         .unthrottle     = serial_omap_unthrottle,
1402         .stop_rx        = serial_omap_stop_rx,
1403         .enable_ms      = serial_omap_enable_ms,
1404         .break_ctl      = serial_omap_break_ctl,
1405         .startup        = serial_omap_startup,
1406         .shutdown       = serial_omap_shutdown,
1407         .set_termios    = serial_omap_set_termios,
1408         .pm             = serial_omap_pm,
1409         .type           = serial_omap_type,
1410         .release_port   = serial_omap_release_port,
1411         .request_port   = serial_omap_request_port,
1412         .config_port    = serial_omap_config_port,
1413         .verify_port    = serial_omap_verify_port,
1414 #ifdef CONFIG_CONSOLE_POLL
1415         .poll_put_char  = serial_omap_poll_put_char,
1416         .poll_get_char  = serial_omap_poll_get_char,
1417 #endif
1418 };
1419
1420 static struct uart_driver serial_omap_reg = {
1421         .owner          = THIS_MODULE,
1422         .driver_name    = "OMAP-SERIAL",
1423         .dev_name       = OMAP_SERIAL_NAME,
1424         .nr             = OMAP_MAX_HSUART_PORTS,
1425         .cons           = OMAP_CONSOLE,
1426 };
1427
1428 #ifdef CONFIG_PM_SLEEP
1429 static int serial_omap_prepare(struct device *dev)
1430 {
1431         struct uart_omap_port *up = dev_get_drvdata(dev);
1432
1433         up->is_suspending = true;
1434
1435         return 0;
1436 }
1437
1438 static void serial_omap_complete(struct device *dev)
1439 {
1440         struct uart_omap_port *up = dev_get_drvdata(dev);
1441
1442         up->is_suspending = false;
1443 }
1444
1445 static int serial_omap_suspend(struct device *dev)
1446 {
1447         struct uart_omap_port *up = dev_get_drvdata(dev);
1448
1449         uart_suspend_port(&serial_omap_reg, &up->port);
1450         flush_work(&up->qos_work);
1451
1452         if (device_may_wakeup(dev))
1453                 serial_omap_enable_wakeup(up, true);
1454         else
1455                 serial_omap_enable_wakeup(up, false);
1456
1457         return 0;
1458 }
1459
1460 static int serial_omap_resume(struct device *dev)
1461 {
1462         struct uart_omap_port *up = dev_get_drvdata(dev);
1463
1464         if (device_may_wakeup(dev))
1465                 serial_omap_enable_wakeup(up, false);
1466
1467         uart_resume_port(&serial_omap_reg, &up->port);
1468
1469         return 0;
1470 }
1471 #else
1472 #define serial_omap_prepare NULL
1473 #define serial_omap_complete NULL
1474 #endif /* CONFIG_PM_SLEEP */
1475
1476 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
1477 {
1478         u32 mvr, scheme;
1479         u16 revision, major, minor;
1480
1481         mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
1482
1483         /* Check revision register scheme */
1484         scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1485
1486         switch (scheme) {
1487         case 0: /* Legacy Scheme: OMAP2/3 */
1488                 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1489                 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1490                                         OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1491                 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1492                 break;
1493         case 1:
1494                 /* New Scheme: OMAP4+ */
1495                 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1496                 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1497                                         OMAP_UART_MVR_MAJ_SHIFT;
1498                 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1499                 break;
1500         default:
1501                 dev_warn(up->dev,
1502                         "Unknown %s revision, defaulting to highest\n",
1503                         up->name);
1504                 /* highest possible revision */
1505                 major = 0xff;
1506                 minor = 0xff;
1507         }
1508
1509         /* normalize revision for the driver */
1510         revision = UART_BUILD_REVISION(major, minor);
1511
1512         switch (revision) {
1513         case OMAP_UART_REV_46:
1514                 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1515                                 UART_ERRATA_i291_DMA_FORCEIDLE);
1516                 break;
1517         case OMAP_UART_REV_52:
1518                 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1519                                 UART_ERRATA_i291_DMA_FORCEIDLE);
1520                 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1521                 break;
1522         case OMAP_UART_REV_63:
1523                 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1524                 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1525                 break;
1526         default:
1527                 break;
1528         }
1529 }
1530
1531 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1532 {
1533         struct omap_uart_port_info *omap_up_info;
1534
1535         omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1536         if (!omap_up_info)
1537                 return NULL; /* out of memory */
1538
1539         of_property_read_u32(dev->of_node, "clock-frequency",
1540                                          &omap_up_info->uartclk);
1541         return omap_up_info;
1542 }
1543
1544 static int serial_omap_probe_rs485(struct uart_omap_port *up,
1545                                    struct device_node *np)
1546 {
1547         struct serial_rs485 *rs485conf = &up->port.rs485;
1548         u32 rs485_delay[2];
1549         enum of_gpio_flags flags;
1550         int ret;
1551
1552         rs485conf->flags = 0;
1553         up->rts_gpio = -EINVAL;
1554
1555         if (!np)
1556                 return 0;
1557
1558         if (of_property_read_bool(np, "rs485-rts-active-high"))
1559                 rs485conf->flags |= SER_RS485_RTS_ON_SEND;
1560         else
1561                 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
1562
1563         /* check for tx enable gpio */
1564         up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
1565         if (gpio_is_valid(up->rts_gpio)) {
1566                 ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
1567                 if (ret < 0)
1568                         return ret;
1569                 ret = gpio_direction_output(up->rts_gpio,
1570                                             flags & SER_RS485_RTS_AFTER_SEND);
1571                 if (ret < 0)
1572                         return ret;
1573         } else if (up->rts_gpio == -EPROBE_DEFER) {
1574                 return -EPROBE_DEFER;
1575         } else {
1576                 up->rts_gpio = -EINVAL;
1577         }
1578
1579         if (of_property_read_u32_array(np, "rs485-rts-delay",
1580                                     rs485_delay, 2) == 0) {
1581                 rs485conf->delay_rts_before_send = rs485_delay[0];
1582                 rs485conf->delay_rts_after_send = rs485_delay[1];
1583         }
1584
1585         if (of_property_read_bool(np, "rs485-rx-during-tx"))
1586                 rs485conf->flags |= SER_RS485_RX_DURING_TX;
1587
1588         if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time"))
1589                 rs485conf->flags |= SER_RS485_ENABLED;
1590
1591         return 0;
1592 }
1593
1594 static int serial_omap_probe(struct platform_device *pdev)
1595 {
1596         struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
1597         struct uart_omap_port *up;
1598         struct resource *mem;
1599         void __iomem *base;
1600         int uartirq = 0;
1601         int wakeirq = 0;
1602         int ret;
1603
1604         /* The optional wakeirq may be specified in the board dts file */
1605         if (pdev->dev.of_node) {
1606                 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1607                 if (!uartirq)
1608                         return -EPROBE_DEFER;
1609                 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1);
1610                 omap_up_info = of_get_uart_port_info(&pdev->dev);
1611                 pdev->dev.platform_data = omap_up_info;
1612         } else {
1613                 uartirq = platform_get_irq(pdev, 0);
1614                 if (uartirq < 0)
1615                         return -EPROBE_DEFER;
1616         }
1617
1618         up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1619         if (!up)
1620                 return -ENOMEM;
1621
1622         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1623         base = devm_ioremap_resource(&pdev->dev, mem);
1624         if (IS_ERR(base))
1625                 return PTR_ERR(base);
1626
1627         up->dev = &pdev->dev;
1628         up->port.dev = &pdev->dev;
1629         up->port.type = PORT_OMAP;
1630         up->port.iotype = UPIO_MEM;
1631         up->port.irq = uartirq;
1632         up->port.regshift = 2;
1633         up->port.fifosize = 64;
1634         up->port.ops = &serial_omap_pops;
1635
1636         if (pdev->dev.of_node)
1637                 ret = of_alias_get_id(pdev->dev.of_node, "serial");
1638         else
1639                 ret = pdev->id;
1640
1641         if (ret < 0) {
1642                 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1643                         ret);
1644                 goto err_port_line;
1645         }
1646         up->port.line = ret;
1647
1648         if (up->port.line >= OMAP_MAX_HSUART_PORTS) {
1649                 dev_err(&pdev->dev, "uart ID %d >  MAX %d.\n", up->port.line,
1650                         OMAP_MAX_HSUART_PORTS);
1651                 ret = -ENXIO;
1652                 goto err_port_line;
1653         }
1654
1655         up->wakeirq = wakeirq;
1656         if (!up->wakeirq)
1657                 dev_info(up->port.dev, "no wakeirq for uart%d\n",
1658                          up->port.line);
1659
1660         ret = serial_omap_probe_rs485(up, pdev->dev.of_node);
1661         if (ret < 0)
1662                 goto err_rs485;
1663
1664         sprintf(up->name, "OMAP UART%d", up->port.line);
1665         up->port.mapbase = mem->start;
1666         up->port.membase = base;
1667         up->port.flags = omap_up_info->flags;
1668         up->port.uartclk = omap_up_info->uartclk;
1669         up->port.rs485_config = serial_omap_config_rs485;
1670         if (!up->port.uartclk) {
1671                 up->port.uartclk = DEFAULT_CLK_SPEED;
1672                 dev_warn(&pdev->dev,
1673                          "No clock speed specified: using default: %d\n",
1674                          DEFAULT_CLK_SPEED);
1675         }
1676
1677         up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1678         up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1679         pm_qos_add_request(&up->pm_qos_request,
1680                 PM_QOS_CPU_DMA_LATENCY, up->latency);
1681         INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1682
1683         platform_set_drvdata(pdev, up);
1684         if (omap_up_info->autosuspend_timeout == 0)
1685                 omap_up_info->autosuspend_timeout = -1;
1686
1687         device_init_wakeup(up->dev, true);
1688         pm_runtime_use_autosuspend(&pdev->dev);
1689         pm_runtime_set_autosuspend_delay(&pdev->dev,
1690                         omap_up_info->autosuspend_timeout);
1691
1692         pm_runtime_irq_safe(&pdev->dev);
1693         pm_runtime_enable(&pdev->dev);
1694
1695         pm_runtime_get_sync(&pdev->dev);
1696
1697         omap_serial_fill_features_erratas(up);
1698
1699         ui[up->port.line] = up;
1700         serial_omap_add_console_port(up);
1701
1702         ret = uart_add_one_port(&serial_omap_reg, &up->port);
1703         if (ret != 0)
1704                 goto err_add_port;
1705
1706         pm_runtime_mark_last_busy(up->dev);
1707         pm_runtime_put_autosuspend(up->dev);
1708         return 0;
1709
1710 err_add_port:
1711         pm_runtime_put(&pdev->dev);
1712         pm_runtime_disable(&pdev->dev);
1713         pm_qos_remove_request(&up->pm_qos_request);
1714         device_init_wakeup(up->dev, false);
1715 err_rs485:
1716 err_port_line:
1717         return ret;
1718 }
1719
1720 static int serial_omap_remove(struct platform_device *dev)
1721 {
1722         struct uart_omap_port *up = platform_get_drvdata(dev);
1723
1724         pm_runtime_put_sync(up->dev);
1725         pm_runtime_disable(up->dev);
1726         uart_remove_one_port(&serial_omap_reg, &up->port);
1727         pm_qos_remove_request(&up->pm_qos_request);
1728         device_init_wakeup(&dev->dev, false);
1729
1730         return 0;
1731 }
1732
1733 /*
1734  * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1735  * The access to uart register after MDR1 Access
1736  * causes UART to corrupt data.
1737  *
1738  * Need a delay =
1739  * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1740  * give 10 times as much
1741  */
1742 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1743 {
1744         u8 timeout = 255;
1745
1746         serial_out(up, UART_OMAP_MDR1, mdr1);
1747         udelay(2);
1748         serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1749                         UART_FCR_CLEAR_RCVR);
1750         /*
1751          * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1752          * TX_FIFO_E bit is 1.
1753          */
1754         while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1755                                 (UART_LSR_THRE | UART_LSR_DR))) {
1756                 timeout--;
1757                 if (!timeout) {
1758                         /* Should *never* happen. we warn and carry on */
1759                         dev_crit(up->dev, "Errata i202: timedout %x\n",
1760                                                 serial_in(up, UART_LSR));
1761                         break;
1762                 }
1763                 udelay(1);
1764         }
1765 }
1766
1767 #ifdef CONFIG_PM
1768 static void serial_omap_restore_context(struct uart_omap_port *up)
1769 {
1770         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1771                 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1772         else
1773                 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1774
1775         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1776         serial_out(up, UART_EFR, UART_EFR_ECB);
1777         serial_out(up, UART_LCR, 0x0); /* Operational mode */
1778         serial_out(up, UART_IER, 0x0);
1779         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1780         serial_out(up, UART_DLL, up->dll);
1781         serial_out(up, UART_DLM, up->dlh);
1782         serial_out(up, UART_LCR, 0x0); /* Operational mode */
1783         serial_out(up, UART_IER, up->ier);
1784         serial_out(up, UART_FCR, up->fcr);
1785         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1786         serial_out(up, UART_MCR, up->mcr);
1787         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1788         serial_out(up, UART_OMAP_SCR, up->scr);
1789         serial_out(up, UART_EFR, up->efr);
1790         serial_out(up, UART_LCR, up->lcr);
1791         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1792                 serial_omap_mdr1_errataset(up, up->mdr1);
1793         else
1794                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1795         serial_out(up, UART_OMAP_WER, up->wer);
1796 }
1797
1798 static int serial_omap_runtime_suspend(struct device *dev)
1799 {
1800         struct uart_omap_port *up = dev_get_drvdata(dev);
1801
1802         if (!up)
1803                 return -EINVAL;
1804
1805         /*
1806         * When using 'no_console_suspend', the console UART must not be
1807         * suspended. Since driver suspend is managed by runtime suspend,
1808         * preventing runtime suspend (by returning error) will keep device
1809         * active during suspend.
1810         */
1811         if (up->is_suspending && !console_suspend_enabled &&
1812             uart_console(&up->port))
1813                 return -EBUSY;
1814
1815         up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1816
1817         serial_omap_enable_wakeup(up, true);
1818
1819         up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1820         schedule_work(&up->qos_work);
1821
1822         return 0;
1823 }
1824
1825 static int serial_omap_runtime_resume(struct device *dev)
1826 {
1827         struct uart_omap_port *up = dev_get_drvdata(dev);
1828
1829         int loss_cnt = serial_omap_get_context_loss_count(up);
1830
1831         serial_omap_enable_wakeup(up, false);
1832
1833         if (loss_cnt < 0) {
1834                 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n",
1835                         loss_cnt);
1836                 serial_omap_restore_context(up);
1837         } else if (up->context_loss_cnt != loss_cnt) {
1838                 serial_omap_restore_context(up);
1839         }
1840         up->latency = up->calc_latency;
1841         schedule_work(&up->qos_work);
1842
1843         return 0;
1844 }
1845 #endif
1846
1847 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1848         SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1849         SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1850                                 serial_omap_runtime_resume, NULL)
1851         .prepare        = serial_omap_prepare,
1852         .complete       = serial_omap_complete,
1853 };
1854
1855 #if defined(CONFIG_OF)
1856 static const struct of_device_id omap_serial_of_match[] = {
1857         { .compatible = "ti,omap2-uart" },
1858         { .compatible = "ti,omap3-uart" },
1859         { .compatible = "ti,omap4-uart" },
1860         {},
1861 };
1862 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1863 #endif
1864
1865 static struct platform_driver serial_omap_driver = {
1866         .probe          = serial_omap_probe,
1867         .remove         = serial_omap_remove,
1868         .driver         = {
1869                 .name   = DRIVER_NAME,
1870                 .pm     = &serial_omap_dev_pm_ops,
1871                 .of_match_table = of_match_ptr(omap_serial_of_match),
1872         },
1873 };
1874
1875 static int __init serial_omap_init(void)
1876 {
1877         int ret;
1878
1879         ret = uart_register_driver(&serial_omap_reg);
1880         if (ret != 0)
1881                 return ret;
1882         ret = platform_driver_register(&serial_omap_driver);
1883         if (ret != 0)
1884                 uart_unregister_driver(&serial_omap_reg);
1885         return ret;
1886 }
1887
1888 static void __exit serial_omap_exit(void)
1889 {
1890         platform_driver_unregister(&serial_omap_driver);
1891         uart_unregister_driver(&serial_omap_reg);
1892 }
1893
1894 module_init(serial_omap_init);
1895 module_exit(serial_omap_exit);
1896
1897 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1898 MODULE_LICENSE("GPL");
1899 MODULE_AUTHOR("Texas Instruments Inc");