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/of.h>
  42 #include <linux/of_irq.h>
  43 #include <linux/gpio.h>
  44 #include <linux/of_gpio.h>
  45 #include <linux/platform_data/serial-omap.h>
  46
  47 #include <dt-bindings/gpio/gpio.h>
  48
  49 #define OMAP_MAX_HSUART_PORTS   6
  50
  51 #define UART_BUILD_REVISION(x, y)       (((x) << 8) | (y))
  52
  53 #define OMAP_UART_REV_42 0x0402
  54 #define OMAP_UART_REV_46 0x0406
  55 #define OMAP_UART_REV_52 0x0502
  56 #define OMAP_UART_REV_63 0x0603
  57
  58 #define OMAP_UART_TX_WAKEUP_EN          BIT(7)
  59
  60 /* Feature flags */
  61 #define OMAP_UART_WER_HAS_TX_WAKEUP     BIT(0)
  62
  63 #define UART_ERRATA_i202_MDR1_ACCESS    BIT(0)
  64 #define UART_ERRATA_i291_DMA_FORCEIDLE  BIT(1)
  65
  66 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
  67
  68 /* SCR register bitmasks */
  69 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK               (1 << 7)
  70 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK               (1 << 6)
  71 #define OMAP_UART_SCR_TX_EMPTY                  (1 << 3)
  72
  73 /* FCR register bitmasks */
  74 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK                 (0x3 << 6)
  75 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK                 (0x3 << 4)
  76
  77 /* MVR register bitmasks */
  78 #define OMAP_UART_MVR_SCHEME_SHIFT      30
  79
  80 #define OMAP_UART_LEGACY_MVR_MAJ_MASK   0xf0
  81 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT  4
  82 #define OMAP_UART_LEGACY_MVR_MIN_MASK   0x0f
  83
  84 #define OMAP_UART_MVR_MAJ_MASK          0x700
  85 #define OMAP_UART_MVR_MAJ_SHIFT         8
  86 #define OMAP_UART_MVR_MIN_MASK          0x3f
  87
  88 #define OMAP_UART_DMA_CH_FREE   -1
  89
  90 #define MSR_SAVE_FLAGS          UART_MSR_ANY_DELTA
  91 #define OMAP_MODE13X_SPEED      230400
  92
  93 /* WER = 0x7F
  94  * Enable module level wakeup in WER reg
  95  */
  96 #define OMAP_UART_WER_MOD_WKUP  0X7F
  97
  98 /* Enable XON/XOFF flow control on output */
  99 #define OMAP_UART_SW_TX         0x08
 100
 101 /* Enable XON/XOFF flow control on input */
 102 #define OMAP_UART_SW_RX         0x02
 103
 104 #define OMAP_UART_SW_CLR        0xF0
 105
 106 #define OMAP_UART_TCR_TRIG      0x0F
 107
 108 struct uart_omap_dma {
 109         u8                      uart_dma_tx;
 110         u8                      uart_dma_rx;
 111         int                     rx_dma_channel;
 112         int                     tx_dma_channel;
 113         dma_addr_t              rx_buf_dma_phys;
 114         dma_addr_t              tx_buf_dma_phys;
 115         unsigned int            uart_base;
 116         /*
 117          * Buffer for rx dma.It is not required for tx because the buffer
 118          * comes from port structure.
 119          */
 120         unsigned char           *rx_buf;
 121         unsigned int            prev_rx_dma_pos;
 122         int                     tx_buf_size;
 123         int                     tx_dma_used;
 124         int                     rx_dma_used;
 125         spinlock_t              tx_lock;
 126         spinlock_t              rx_lock;
 127         /* timer to poll activity on rx dma */
 128         struct timer_list       rx_timer;
 129         unsigned int            rx_buf_size;
 130         unsigned int            rx_poll_rate;
 131         unsigned int            rx_timeout;
 132 };
 133
 134 struct uart_omap_port {
 135         struct uart_port        port;
 136         struct uart_omap_dma    uart_dma;
 137         struct device           *dev;
 138         int                     wakeirq;
 139
 140         unsigned char           ier;
 141         unsigned char           lcr;
 142         unsigned char           mcr;
 143         unsigned char           fcr;
 144         unsigned char           efr;
 145         unsigned char           dll;
 146         unsigned char           dlh;
 147         unsigned char           mdr1;
 148         unsigned char           scr;
 149         unsigned char           wer;
 150
 151         int                     use_dma;
 152         /*
 153          * Some bits in registers are cleared on a read, so they must
 154          * be saved whenever the register is read but the bits will not
 155          * be immediately processed.
 156          */
 157         unsigned int            lsr_break_flag;
 158         unsigned char           msr_saved_flags;
 159         char                    name[20];
 160         unsigned long           port_activity;
 161         int                     context_loss_cnt;
 162         u32                     errata;
 163         u8                      wakeups_enabled;
 164         u32                     features;
 165
 166         struct serial_rs485     rs485;
 167         int                     rts_gpio;
 168
 169         struct pm_qos_request   pm_qos_request;
 170         u32                     latency;
 171         u32                     calc_latency;
 172         struct work_struct      qos_work;
 173         bool                    is_suspending;
 174 };
 175
 176 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
 177
 178 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 179
 180 /* Forward declaration of functions */
 181 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
 182
 183 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
 184 {
 185         offset <<= up->port.regshift;
 186         return readw(up->port.membase + offset);
 187 }
 188
 189 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
 190 {
 191         offset <<= up->port.regshift;
 192         writew(value, up->port.membase + offset);
 193 }
 194
 195 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
 196 {
 197         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 198         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 199                        UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 200         serial_out(up, UART_FCR, 0);
 201 }
 202
 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 static inline void serial_omap_enable_wakeirq(struct uart_omap_port *up,
 214                                        bool enable)
 215 {
 216         if (!up->wakeirq)
 217                 return;
 218
 219         if (enable)
 220                 enable_irq(up->wakeirq);
 221         else
 222                 disable_irq_nosync(up->wakeirq);
 223 }
 224
 225 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
 226 {
 227         struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
 228
 229         if (enable == up->wakeups_enabled)
 230                 return;
 231
 232         serial_omap_enable_wakeirq(up, enable);
 233         up->wakeups_enabled = enable;
 234
 235         if (!pdata || !pdata->enable_wakeup)
 236                 return;
 237
 238         pdata->enable_wakeup(up->dev, enable);
 239 }
 240
 241 /*
 242  * serial_omap_baud_is_mode16 - check if baud rate is MODE16X
 243  * @port: uart port info
 244  * @baud: baudrate for which mode needs to be determined
 245  *
 246  * Returns true if baud rate is MODE16X and false if MODE13X
 247  * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values,
 248  * and Error Rates" determines modes not for all common baud rates.
 249  * E.g. for 1000000 baud rate mode must be 16x, but according to that
 250  * table it's determined as 13x.
 251  */
 252 static bool
 253 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
 254 {
 255         unsigned int n13 = port->uartclk / (13 * baud);
 256         unsigned int n16 = port->uartclk / (16 * baud);
 257         int baudAbsDiff13 = baud - (port->uartclk / (13 * n13));
 258         int baudAbsDiff16 = baud - (port->uartclk / (16 * n16));
 259         if (baudAbsDiff13 < 0)
 260                 baudAbsDiff13 = -baudAbsDiff13;
 261         if (baudAbsDiff16 < 0)
 262                 baudAbsDiff16 = -baudAbsDiff16;
 263
 264         return (baudAbsDiff13 >= baudAbsDiff16);
 265 }
 266
 267 /*
 268  * serial_omap_get_divisor - calculate divisor value
 269  * @port: uart port info
 270  * @baud: baudrate for which divisor needs to be calculated.
 271  */
 272 static unsigned int
 273 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
 274 {
 275         unsigned int mode;
 276
 277         if (!serial_omap_baud_is_mode16(port, baud))
 278                 mode = 13;
 279         else
 280                 mode = 16;
 281         return port->uartclk/(mode * baud);
 282 }
 283
 284 static void serial_omap_enable_ms(struct uart_port *port)
 285 {
 286         struct uart_omap_port *up = to_uart_omap_port(port);
 287
 288         dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
 289
 290         pm_runtime_get_sync(up->dev);
 291         up->ier |= UART_IER_MSI;
 292         serial_out(up, UART_IER, up->ier);
 293         pm_runtime_mark_last_busy(up->dev);
 294         pm_runtime_put_autosuspend(up->dev);
 295 }
 296
 297 static void serial_omap_stop_tx(struct uart_port *port)
 298 {
 299         struct uart_omap_port *up = to_uart_omap_port(port);
 300         int res;
 301
 302         pm_runtime_get_sync(up->dev);
 303
 304         /* Handle RS-485 */
 305         if (up->rs485.flags & SER_RS485_ENABLED) {
 306                 if (up->scr & OMAP_UART_SCR_TX_EMPTY) {
 307                         /* THR interrupt is fired when both TX FIFO and TX
 308                          * shift register are empty. This means there's nothing
 309                          * left to transmit now, so make sure the THR interrupt
 310                          * is fired when TX FIFO is below the trigger level,
 311                          * disable THR interrupts and toggle the RS-485 GPIO
 312                          * data direction pin if needed.
 313                          */
 314                         up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
 315                         serial_out(up, UART_OMAP_SCR, up->scr);
 316                         res = (up->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 1 : 0;
 317                         if (gpio_get_value(up->rts_gpio) != res) {
 318                                 if (up->rs485.delay_rts_after_send > 0)
 319                                         mdelay(up->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 ((up->rs485.flags & SER_RS485_ENABLED) &&
 343             !(up->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 (up->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 = (up->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 (up->rs485.delay_rts_before_send > 0)
 428                                 mdelay(up->rs485.delay_rts_before_send);
 429                 }
 430         }
 431
 432         if ((up->rs485.flags & SER_RS485_ENABLED) &&
 433             !(up->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;
 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         pm_runtime_mark_last_busy(up->dev);
 690         pm_runtime_put_autosuspend(up->dev);
 691 }
 692
 693 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
 694 {
 695         struct uart_omap_port *up = to_uart_omap_port(port);
 696         unsigned long flags = 0;
 697
 698         dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
 699         pm_runtime_get_sync(up->dev);
 700         spin_lock_irqsave(&up->port.lock, flags);
 701         if (break_state == -1)
 702                 up->lcr |= UART_LCR_SBC;
 703         else
 704                 up->lcr &= ~UART_LCR_SBC;
 705         serial_out(up, UART_LCR, up->lcr);
 706         spin_unlock_irqrestore(&up->port.lock, flags);
 707         pm_runtime_mark_last_busy(up->dev);
 708         pm_runtime_put_autosuspend(up->dev);
 709 }
 710
 711 static int serial_omap_startup(struct uart_port *port)
 712 {
 713         struct uart_omap_port *up = to_uart_omap_port(port);
 714         unsigned long flags = 0;
 715         int retval;
 716
 717         /*
 718          * Allocate the IRQ
 719          */
 720         retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
 721                                 up->name, up);
 722         if (retval)
 723                 return retval;
 724
 725         /* Optional wake-up IRQ */
 726         if (up->wakeirq) {
 727                 retval = request_irq(up->wakeirq, serial_omap_irq,
 728                                      up->port.irqflags, up->name, up);
 729                 if (retval) {
 730                         free_irq(up->port.irq, up);
 731                         return retval;
 732                 }
 733                 disable_irq(up->wakeirq);
 734         }
 735
 736         dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
 737
 738         pm_runtime_get_sync(up->dev);
 739         /*
 740          * Clear the FIFO buffers and disable them.
 741          * (they will be reenabled in set_termios())
 742          */
 743         serial_omap_clear_fifos(up);
 744         /* For Hardware flow control */
 745         serial_out(up, UART_MCR, UART_MCR_RTS);
 746
 747         /*
 748          * Clear the interrupt registers.
 749          */
 750         (void) serial_in(up, UART_LSR);
 751         if (serial_in(up, UART_LSR) & UART_LSR_DR)
 752                 (void) serial_in(up, UART_RX);
 753         (void) serial_in(up, UART_IIR);
 754         (void) serial_in(up, UART_MSR);
 755
 756         /*
 757          * Now, initialize the UART
 758          */
 759         serial_out(up, UART_LCR, UART_LCR_WLEN8);
 760         spin_lock_irqsave(&up->port.lock, flags);
 761         /*
 762          * Most PC uarts need OUT2 raised to enable interrupts.
 763          */
 764         up->port.mctrl |= TIOCM_OUT2;
 765         serial_omap_set_mctrl(&up->port, up->port.mctrl);
 766         spin_unlock_irqrestore(&up->port.lock, flags);
 767
 768         up->msr_saved_flags = 0;
 769         /*
 770          * Finally, enable interrupts. Note: Modem status interrupts
 771          * are set via set_termios(), which will be occurring imminently
 772          * anyway, so we don't enable them here.
 773          */
 774         up->ier = UART_IER_RLSI | UART_IER_RDI;
 775         serial_out(up, UART_IER, up->ier);
 776
 777         /* Enable module level wake up */
 778         up->wer = OMAP_UART_WER_MOD_WKUP;
 779         if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP)
 780                 up->wer |= OMAP_UART_TX_WAKEUP_EN;
 781
 782         serial_out(up, UART_OMAP_WER, up->wer);
 783
 784         pm_runtime_mark_last_busy(up->dev);
 785         pm_runtime_put_autosuspend(up->dev);
 786         up->port_activity = jiffies;
 787         return 0;
 788 }
 789
 790 static void serial_omap_shutdown(struct uart_port *port)
 791 {
 792         struct uart_omap_port *up = to_uart_omap_port(port);
 793         unsigned long flags = 0;
 794
 795         dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
 796
 797         pm_runtime_get_sync(up->dev);
 798         /*
 799          * Disable interrupts from this port
 800          */
 801         up->ier = 0;
 802         serial_out(up, UART_IER, 0);
 803
 804         spin_lock_irqsave(&up->port.lock, flags);
 805         up->port.mctrl &= ~TIOCM_OUT2;
 806         serial_omap_set_mctrl(&up->port, up->port.mctrl);
 807         spin_unlock_irqrestore(&up->port.lock, flags);
 808
 809         /*
 810          * Disable break condition and FIFOs
 811          */
 812         serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
 813         serial_omap_clear_fifos(up);
 814
 815         /*
 816          * Read data port to reset things, and then free the irq
 817          */
 818         if (serial_in(up, UART_LSR) & UART_LSR_DR)
 819                 (void) serial_in(up, UART_RX);
 820
 821         pm_runtime_mark_last_busy(up->dev);
 822         pm_runtime_put_autosuspend(up->dev);
 823         free_irq(up->port.irq, up);
 824         if (up->wakeirq)
 825                 free_irq(up->wakeirq, up);
 826 }
 827
 828 static void serial_omap_uart_qos_work(struct work_struct *work)
 829 {
 830         struct uart_omap_port *up = container_of(work, struct uart_omap_port,
 831                                                 qos_work);
 832
 833         pm_qos_update_request(&up->pm_qos_request, up->latency);
 834 }
 835
 836 static void
 837 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 838                         struct ktermios *old)
 839 {
 840         struct uart_omap_port *up = to_uart_omap_port(port);
 841         unsigned char cval = 0;
 842         unsigned long flags = 0;
 843         unsigned int baud, quot;
 844
 845         switch (termios->c_cflag & CSIZE) {
 846         case CS5:
 847                 cval = UART_LCR_WLEN5;
 848                 break;
 849         case CS6:
 850                 cval = UART_LCR_WLEN6;
 851                 break;
 852         case CS7:
 853                 cval = UART_LCR_WLEN7;
 854                 break;
 855         default:
 856         case CS8:
 857                 cval = UART_LCR_WLEN8;
 858                 break;
 859         }
 860
 861         if (termios->c_cflag & CSTOPB)
 862                 cval |= UART_LCR_STOP;
 863         if (termios->c_cflag & PARENB)
 864                 cval |= UART_LCR_PARITY;
 865         if (!(termios->c_cflag & PARODD))
 866                 cval |= UART_LCR_EPAR;
 867         if (termios->c_cflag & CMSPAR)
 868                 cval |= UART_LCR_SPAR;
 869
 870         /*
 871          * Ask the core to calculate the divisor for us.
 872          */
 873
 874         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
 875         quot = serial_omap_get_divisor(port, baud);
 876
 877         /* calculate wakeup latency constraint */
 878         up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
 879         up->latency = up->calc_latency;
 880         schedule_work(&up->qos_work);
 881
 882         up->dll = quot & 0xff;
 883         up->dlh = quot >> 8;
 884         up->mdr1 = UART_OMAP_MDR1_DISABLE;
 885
 886         up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
 887                         UART_FCR_ENABLE_FIFO;
 888
 889         /*
 890          * Ok, we're now changing the port state. Do it with
 891          * interrupts disabled.
 892          */
 893         pm_runtime_get_sync(up->dev);
 894         spin_lock_irqsave(&up->port.lock, flags);
 895
 896         /*
 897          * Update the per-port timeout.
 898          */
 899         uart_update_timeout(port, termios->c_cflag, baud);
 900
 901         up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 902         if (termios->c_iflag & INPCK)
 903                 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 904         if (termios->c_iflag & (BRKINT | PARMRK))
 905                 up->port.read_status_mask |= UART_LSR_BI;
 906
 907         /*
 908          * Characters to ignore
 909          */
 910         up->port.ignore_status_mask = 0;
 911         if (termios->c_iflag & IGNPAR)
 912                 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 913         if (termios->c_iflag & IGNBRK) {
 914                 up->port.ignore_status_mask |= UART_LSR_BI;
 915                 /*
 916                  * If we're ignoring parity and break indicators,
 917                  * ignore overruns too (for real raw support).
 918                  */
 919                 if (termios->c_iflag & IGNPAR)
 920                         up->port.ignore_status_mask |= UART_LSR_OE;
 921         }
 922
 923         /*
 924          * ignore all characters if CREAD is not set
 925          */
 926         if ((termios->c_cflag & CREAD) == 0)
 927                 up->port.ignore_status_mask |= UART_LSR_DR;
 928
 929         /*
 930          * Modem status interrupts
 931          */
 932         up->ier &= ~UART_IER_MSI;
 933         if (UART_ENABLE_MS(&up->port, termios->c_cflag))
 934                 up->ier |= UART_IER_MSI;
 935         serial_out(up, UART_IER, up->ier);
 936         serial_out(up, UART_LCR, cval);         /* reset DLAB */
 937         up->lcr = cval;
 938         up->scr = 0;
 939
 940         /* FIFOs and DMA Settings */
 941
 942         /* FCR can be changed only when the
 943          * baud clock is not running
 944          * DLL_REG and DLH_REG set to 0.
 945          */
 946         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
 947         serial_out(up, UART_DLL, 0);
 948         serial_out(up, UART_DLM, 0);
 949         serial_out(up, UART_LCR, 0);
 950
 951         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 952
 953         up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB;
 954         up->efr &= ~UART_EFR_SCD;
 955         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
 956
 957         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
 958         up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR;
 959         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
 960         /* FIFO ENABLE, DMA MODE */
 961
 962         up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
 963         /*
 964          * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK
 965          * sets Enables the granularity of 1 for TRIGGER RX
 966          * level. Along with setting RX FIFO trigger level
 967          * to 1 (as noted below, 16 characters) and TLR[3:0]
 968          * to zero this will result RX FIFO threshold level
 969          * to 1 character, instead of 16 as noted in comment
 970          * below.
 971          */
 972
 973         /* Set receive FIFO threshold to 16 characters and
 974          * transmit FIFO threshold to 32 spaces
 975          */
 976         up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
 977         up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
 978         up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
 979                 UART_FCR_ENABLE_FIFO;
 980
 981         serial_out(up, UART_FCR, up->fcr);
 982         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 983
 984         serial_out(up, UART_OMAP_SCR, up->scr);
 985
 986         /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */
 987         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
 988         serial_out(up, UART_MCR, up->mcr);
 989         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 990         serial_out(up, UART_EFR, up->efr);
 991         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
 992
 993         /* Protocol, Baud Rate, and Interrupt Settings */
 994
 995         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
 996                 serial_omap_mdr1_errataset(up, up->mdr1);
 997         else
 998                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
 999
1000         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1001         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1002
1003         serial_out(up, UART_LCR, 0);
1004         serial_out(up, UART_IER, 0);
1005         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1006
1007         serial_out(up, UART_DLL, up->dll);      /* LS of divisor */
1008         serial_out(up, UART_DLM, up->dlh);      /* MS of divisor */
1009
1010         serial_out(up, UART_LCR, 0);
1011         serial_out(up, UART_IER, up->ier);
1012         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1013
1014         serial_out(up, UART_EFR, up->efr);
1015         serial_out(up, UART_LCR, cval);
1016
1017         if (!serial_omap_baud_is_mode16(port, baud))
1018                 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
1019         else
1020                 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
1021
1022         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1023                 serial_omap_mdr1_errataset(up, up->mdr1);
1024         else
1025                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1026
1027         /* Configure flow control */
1028         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1029
1030         /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */
1031         serial_out(up, UART_XON1, termios->c_cc[VSTART]);
1032         serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
1033
1034         /* Enable access to TCR/TLR */
1035         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1036         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1037         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
1038
1039         serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
1040
1041         if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
1042                 /* Enable AUTORTS and AUTOCTS */
1043                 up->efr |= UART_EFR_CTS | UART_EFR_RTS;
1044
1045                 /* Ensure MCR RTS is asserted */
1046                 up->mcr |= UART_MCR_RTS;
1047         } else {
1048                 /* Disable AUTORTS and AUTOCTS */
1049                 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS);
1050         }
1051
1052         if (up->port.flags & UPF_SOFT_FLOW) {
1053                 /* clear SW control mode bits */
1054                 up->efr &= OMAP_UART_SW_CLR;
1055
1056                 /*
1057                  * IXON Flag:
1058                  * Enable XON/XOFF flow control on input.
1059                  * Receiver compares XON1, XOFF1.
1060                  */
1061                 if (termios->c_iflag & IXON)
1062                         up->efr |= OMAP_UART_SW_RX;
1063
1064                 /*
1065                  * IXOFF Flag:
1066                  * Enable XON/XOFF flow control on output.
1067                  * Transmit XON1, XOFF1
1068                  */
1069                 if (termios->c_iflag & IXOFF)
1070                         up->efr |= OMAP_UART_SW_TX;
1071
1072                 /*
1073                  * IXANY Flag:
1074                  * Enable any character to restart output.
1075                  * Operation resumes after receiving any
1076                  * character after recognition of the XOFF character
1077                  */
1078                 if (termios->c_iflag & IXANY)
1079                         up->mcr |= UART_MCR_XONANY;
1080                 else
1081                         up->mcr &= ~UART_MCR_XONANY;
1082         }
1083         serial_out(up, UART_MCR, up->mcr);
1084         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1085         serial_out(up, UART_EFR, up->efr);
1086         serial_out(up, UART_LCR, up->lcr);
1087
1088         serial_omap_set_mctrl(&up->port, up->port.mctrl);
1089
1090         spin_unlock_irqrestore(&up->port.lock, flags);
1091         pm_runtime_mark_last_busy(up->dev);
1092         pm_runtime_put_autosuspend(up->dev);
1093         dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
1094 }
1095
1096 static void
1097 serial_omap_pm(struct uart_port *port, unsigned int state,
1098                unsigned int oldstate)
1099 {
1100         struct uart_omap_port *up = to_uart_omap_port(port);
1101         unsigned char efr;
1102
1103         dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
1104
1105         pm_runtime_get_sync(up->dev);
1106         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1107         efr = serial_in(up, UART_EFR);
1108         serial_out(up, UART_EFR, efr | UART_EFR_ECB);
1109         serial_out(up, UART_LCR, 0);
1110
1111         serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
1112         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1113         serial_out(up, UART_EFR, efr);
1114         serial_out(up, UART_LCR, 0);
1115
1116         if (!device_may_wakeup(up->dev)) {
1117                 if (!state)
1118                         pm_runtime_forbid(up->dev);
1119                 else
1120                         pm_runtime_allow(up->dev);
1121         }
1122
1123         pm_runtime_mark_last_busy(up->dev);
1124         pm_runtime_put_autosuspend(up->dev);
1125 }
1126
1127 static void serial_omap_release_port(struct uart_port *port)
1128 {
1129         dev_dbg(port->dev, "serial_omap_release_port+\n");
1130 }
1131
1132 static int serial_omap_request_port(struct uart_port *port)
1133 {
1134         dev_dbg(port->dev, "serial_omap_request_port+\n");
1135         return 0;
1136 }
1137
1138 static void serial_omap_config_port(struct uart_port *port, int flags)
1139 {
1140         struct uart_omap_port *up = to_uart_omap_port(port);
1141
1142         dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
1143                                                         up->port.line);
1144         up->port.type = PORT_OMAP;
1145         up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW;
1146 }
1147
1148 static int
1149 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
1150 {
1151         /* we don't want the core code to modify any port params */
1152         dev_dbg(port->dev, "serial_omap_verify_port+\n");
1153         return -EINVAL;
1154 }
1155
1156 static const char *
1157 serial_omap_type(struct uart_port *port)
1158 {
1159         struct uart_omap_port *up = to_uart_omap_port(port);
1160
1161         dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
1162         return up->name;
1163 }
1164
1165 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1166
1167 static inline void wait_for_xmitr(struct uart_omap_port *up)
1168 {
1169         unsigned int status, tmout = 10000;
1170
1171         /* Wait up to 10ms for the character(s) to be sent. */
1172         do {
1173                 status = serial_in(up, UART_LSR);
1174
1175                 if (status & UART_LSR_BI)
1176                         up->lsr_break_flag = UART_LSR_BI;
1177
1178                 if (--tmout == 0)
1179                         break;
1180                 udelay(1);
1181         } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1182
1183         /* Wait up to 1s for flow control if necessary */
1184         if (up->port.flags & UPF_CONS_FLOW) {
1185                 tmout = 1000000;
1186                 for (tmout = 1000000; tmout; tmout--) {
1187                         unsigned int msr = serial_in(up, UART_MSR);
1188
1189                         up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1190                         if (msr & UART_MSR_CTS)
1191                                 break;
1192
1193                         udelay(1);
1194                 }
1195         }
1196 }
1197
1198 #ifdef CONFIG_CONSOLE_POLL
1199
1200 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1201 {
1202         struct uart_omap_port *up = to_uart_omap_port(port);
1203
1204         pm_runtime_get_sync(up->dev);
1205         wait_for_xmitr(up);
1206         serial_out(up, UART_TX, ch);
1207         pm_runtime_mark_last_busy(up->dev);
1208         pm_runtime_put_autosuspend(up->dev);
1209 }
1210
1211 static int serial_omap_poll_get_char(struct uart_port *port)
1212 {
1213         struct uart_omap_port *up = to_uart_omap_port(port);
1214         unsigned int status;
1215
1216         pm_runtime_get_sync(up->dev);
1217         status = serial_in(up, UART_LSR);
1218         if (!(status & UART_LSR_DR)) {
1219                 status = NO_POLL_CHAR;
1220                 goto out;
1221         }
1222
1223         status = serial_in(up, UART_RX);
1224
1225 out:
1226         pm_runtime_mark_last_busy(up->dev);
1227         pm_runtime_put_autosuspend(up->dev);
1228
1229         return status;
1230 }
1231
1232 #endif /* CONFIG_CONSOLE_POLL */
1233
1234 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1235
1236 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
1237
1238 static struct uart_driver serial_omap_reg;
1239
1240 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1241 {
1242         struct uart_omap_port *up = to_uart_omap_port(port);
1243
1244         wait_for_xmitr(up);
1245         serial_out(up, UART_TX, ch);
1246 }
1247
1248 static void
1249 serial_omap_console_write(struct console *co, const char *s,
1250                 unsigned int count)
1251 {
1252         struct uart_omap_port *up = serial_omap_console_ports[co->index];
1253         unsigned long flags;
1254         unsigned int ier;
1255         int locked = 1;
1256
1257         pm_runtime_get_sync(up->dev);
1258
1259         local_irq_save(flags);
1260         if (up->port.sysrq)
1261                 locked = 0;
1262         else if (oops_in_progress)
1263                 locked = spin_trylock(&up->port.lock);
1264         else
1265                 spin_lock(&up->port.lock);
1266
1267         /*
1268          * First save the IER then disable the interrupts
1269          */
1270         ier = serial_in(up, UART_IER);
1271         serial_out(up, UART_IER, 0);
1272
1273         uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1274
1275         /*
1276          * Finally, wait for transmitter to become empty
1277          * and restore the IER
1278          */
1279         wait_for_xmitr(up);
1280         serial_out(up, UART_IER, ier);
1281         /*
1282          * The receive handling will happen properly because the
1283          * receive ready bit will still be set; it is not cleared
1284          * on read.  However, modem control will not, we must
1285          * call it if we have saved something in the saved flags
1286          * while processing with interrupts off.
1287          */
1288         if (up->msr_saved_flags)
1289                 check_modem_status(up);
1290
1291         pm_runtime_mark_last_busy(up->dev);
1292         pm_runtime_put_autosuspend(up->dev);
1293         if (locked)
1294                 spin_unlock(&up->port.lock);
1295         local_irq_restore(flags);
1296 }
1297
1298 static int __init
1299 serial_omap_console_setup(struct console *co, char *options)
1300 {
1301         struct uart_omap_port *up;
1302         int baud = 115200;
1303         int bits = 8;
1304         int parity = 'n';
1305         int flow = 'n';
1306
1307         if (serial_omap_console_ports[co->index] == NULL)
1308                 return -ENODEV;
1309         up = serial_omap_console_ports[co->index];
1310
1311         if (options)
1312                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1313
1314         return uart_set_options(&up->port, co, baud, parity, bits, flow);
1315 }
1316
1317 static struct console serial_omap_console = {
1318         .name           = OMAP_SERIAL_NAME,
1319         .write          = serial_omap_console_write,
1320         .device         = uart_console_device,
1321         .setup          = serial_omap_console_setup,
1322         .flags          = CON_PRINTBUFFER,
1323         .index          = -1,
1324         .data           = &serial_omap_reg,
1325 };
1326
1327 static void serial_omap_add_console_port(struct uart_omap_port *up)
1328 {
1329         serial_omap_console_ports[up->port.line] = up;
1330 }
1331
1332 #define OMAP_CONSOLE    (&serial_omap_console)
1333
1334 #else
1335
1336 #define OMAP_CONSOLE    NULL
1337
1338 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1339 {}
1340
1341 #endif
1342
1343 /* Enable or disable the rs485 support */
1344 static void
1345 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
1346 {
1347         struct uart_omap_port *up = to_uart_omap_port(port);
1348         unsigned long flags;
1349         unsigned int mode;
1350         int val;
1351
1352         pm_runtime_get_sync(up->dev);
1353         spin_lock_irqsave(&up->port.lock, flags);
1354
1355         /* Disable interrupts from this port */
1356         mode = up->ier;
1357         up->ier = 0;
1358         serial_out(up, UART_IER, 0);
1359
1360         /* store new config */
1361         up->rs485 = *rs485conf;
1362
1363         /*
1364          * Just as a precaution, only allow rs485
1365          * to be enabled if the gpio pin is valid
1366          */
1367         if (gpio_is_valid(up->rts_gpio)) {
1368                 /* enable / disable rts */
1369                 val = (up->rs485.flags & SER_RS485_ENABLED) ?
1370                         SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
1371                 val = (up->rs485.flags & val) ? 1 : 0;
1372                 gpio_set_value(up->rts_gpio, val);
1373         } else
1374                 up->rs485.flags &= ~SER_RS485_ENABLED;
1375
1376         /* Enable interrupts */
1377         up->ier = mode;
1378         serial_out(up, UART_IER, up->ier);
1379
1380         /* If RS-485 is disabled, make sure the THR interrupt is fired when
1381          * TX FIFO is below the trigger level.
1382          */
1383         if (!(up->rs485.flags & SER_RS485_ENABLED) &&
1384             (up->scr & OMAP_UART_SCR_TX_EMPTY)) {
1385                 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
1386                 serial_out(up, UART_OMAP_SCR, up->scr);
1387         }
1388
1389         spin_unlock_irqrestore(&up->port.lock, flags);
1390         pm_runtime_mark_last_busy(up->dev);
1391         pm_runtime_put_autosuspend(up->dev);
1392 }
1393
1394 static int
1395 serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
1396 {
1397         struct serial_rs485 rs485conf;
1398
1399         switch (cmd) {
1400         case TIOCSRS485:
1401                 if (copy_from_user(&rs485conf, (void __user *) arg,
1402                                         sizeof(rs485conf)))
1403                         return -EFAULT;
1404
1405                 serial_omap_config_rs485(port, &rs485conf);
1406                 break;
1407
1408         case TIOCGRS485:
1409                 if (copy_to_user((void __user *) arg,
1410                                         &(to_uart_omap_port(port)->rs485),
1411                                         sizeof(rs485conf)))
1412                         return -EFAULT;
1413                 break;
1414
1415         default:
1416                 return -ENOIOCTLCMD;
1417         }
1418         return 0;
1419 }
1420
1421
1422 static struct uart_ops serial_omap_pops = {
1423         .tx_empty       = serial_omap_tx_empty,
1424         .set_mctrl      = serial_omap_set_mctrl,
1425         .get_mctrl      = serial_omap_get_mctrl,
1426         .stop_tx        = serial_omap_stop_tx,
1427         .start_tx       = serial_omap_start_tx,
1428         .throttle       = serial_omap_throttle,
1429         .unthrottle     = serial_omap_unthrottle,
1430         .stop_rx        = serial_omap_stop_rx,
1431         .enable_ms      = serial_omap_enable_ms,
1432         .break_ctl      = serial_omap_break_ctl,
1433         .startup        = serial_omap_startup,
1434         .shutdown       = serial_omap_shutdown,
1435         .set_termios    = serial_omap_set_termios,
1436         .pm             = serial_omap_pm,
1437         .type           = serial_omap_type,
1438         .release_port   = serial_omap_release_port,
1439         .request_port   = serial_omap_request_port,
1440         .config_port    = serial_omap_config_port,
1441         .verify_port    = serial_omap_verify_port,
1442         .ioctl          = serial_omap_ioctl,
1443 #ifdef CONFIG_CONSOLE_POLL
1444         .poll_put_char  = serial_omap_poll_put_char,
1445         .poll_get_char  = serial_omap_poll_get_char,
1446 #endif
1447 };
1448
1449 static struct uart_driver serial_omap_reg = {
1450         .owner          = THIS_MODULE,
1451         .driver_name    = "OMAP-SERIAL",
1452         .dev_name       = OMAP_SERIAL_NAME,
1453         .nr             = OMAP_MAX_HSUART_PORTS,
1454         .cons           = OMAP_CONSOLE,
1455 };
1456
1457 #ifdef CONFIG_PM_SLEEP
1458 static int serial_omap_prepare(struct device *dev)
1459 {
1460         struct uart_omap_port *up = dev_get_drvdata(dev);
1461
1462         up->is_suspending = true;
1463
1464         return 0;
1465 }
1466
1467 static void serial_omap_complete(struct device *dev)
1468 {
1469         struct uart_omap_port *up = dev_get_drvdata(dev);
1470
1471         up->is_suspending = false;
1472 }
1473
1474 static int serial_omap_suspend(struct device *dev)
1475 {
1476         struct uart_omap_port *up = dev_get_drvdata(dev);
1477
1478         uart_suspend_port(&serial_omap_reg, &up->port);
1479         flush_work(&up->qos_work);
1480
1481         if (device_may_wakeup(dev))
1482                 serial_omap_enable_wakeup(up, true);
1483         else
1484                 serial_omap_enable_wakeup(up, false);
1485
1486         return 0;
1487 }
1488
1489 static int serial_omap_resume(struct device *dev)
1490 {
1491         struct uart_omap_port *up = dev_get_drvdata(dev);
1492
1493         if (device_may_wakeup(dev))
1494                 serial_omap_enable_wakeup(up, false);
1495
1496         uart_resume_port(&serial_omap_reg, &up->port);
1497
1498         return 0;
1499 }
1500 #else
1501 #define serial_omap_prepare NULL
1502 #define serial_omap_complete NULL
1503 #endif /* CONFIG_PM_SLEEP */
1504
1505 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
1506 {
1507         u32 mvr, scheme;
1508         u16 revision, major, minor;
1509
1510         mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
1511
1512         /* Check revision register scheme */
1513         scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1514
1515         switch (scheme) {
1516         case 0: /* Legacy Scheme: OMAP2/3 */
1517                 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1518                 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1519                                         OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1520                 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1521                 break;
1522         case 1:
1523                 /* New Scheme: OMAP4+ */
1524                 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1525                 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1526                                         OMAP_UART_MVR_MAJ_SHIFT;
1527                 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1528                 break;
1529         default:
1530                 dev_warn(up->dev,
1531                         "Unknown %s revision, defaulting to highest\n",
1532                         up->name);
1533                 /* highest possible revision */
1534                 major = 0xff;
1535                 minor = 0xff;
1536         }
1537
1538         /* normalize revision for the driver */
1539         revision = UART_BUILD_REVISION(major, minor);
1540
1541         switch (revision) {
1542         case OMAP_UART_REV_46:
1543                 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1544                                 UART_ERRATA_i291_DMA_FORCEIDLE);
1545                 break;
1546         case OMAP_UART_REV_52:
1547                 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1548                                 UART_ERRATA_i291_DMA_FORCEIDLE);
1549                 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1550                 break;
1551         case OMAP_UART_REV_63:
1552                 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1553                 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1554                 break;
1555         default:
1556                 break;
1557         }
1558 }
1559
1560 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1561 {
1562         struct omap_uart_port_info *omap_up_info;
1563
1564         omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1565         if (!omap_up_info)
1566                 return NULL; /* out of memory */
1567
1568         of_property_read_u32(dev->of_node, "clock-frequency",
1569                                          &omap_up_info->uartclk);
1570         return omap_up_info;
1571 }
1572
1573 static int serial_omap_probe_rs485(struct uart_omap_port *up,
1574                                    struct device_node *np)
1575 {
1576         struct serial_rs485 *rs485conf = &up->rs485;
1577         u32 rs485_delay[2];
1578         enum of_gpio_flags flags;
1579         int ret;
1580
1581         rs485conf->flags = 0;
1582         up->rts_gpio = -EINVAL;
1583
1584         if (!np)
1585                 return 0;
1586
1587         if (of_property_read_bool(np, "rs485-rts-active-high"))
1588                 rs485conf->flags |= SER_RS485_RTS_ON_SEND;
1589         else
1590                 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
1591
1592         /* check for tx enable gpio */
1593         up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
1594         if (gpio_is_valid(up->rts_gpio)) {
1595                 ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
1596                 if (ret < 0)
1597                         return ret;
1598                 ret = gpio_direction_output(up->rts_gpio,
1599                                             flags & SER_RS485_RTS_AFTER_SEND);
1600                 if (ret < 0)
1601                         return ret;
1602         } else if (up->rts_gpio == -EPROBE_DEFER) {
1603                 return -EPROBE_DEFER;
1604         } else {
1605                 up->rts_gpio = -EINVAL;
1606         }
1607
1608         if (of_property_read_u32_array(np, "rs485-rts-delay",
1609                                     rs485_delay, 2) == 0) {
1610                 rs485conf->delay_rts_before_send = rs485_delay[0];
1611                 rs485conf->delay_rts_after_send = rs485_delay[1];
1612         }
1613
1614         if (of_property_read_bool(np, "rs485-rx-during-tx"))
1615                 rs485conf->flags |= SER_RS485_RX_DURING_TX;
1616
1617         if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time"))
1618                 rs485conf->flags |= SER_RS485_ENABLED;
1619
1620         return 0;
1621 }
1622
1623 static int serial_omap_probe(struct platform_device *pdev)
1624 {
1625         struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
1626         struct uart_omap_port *up;
1627         struct resource *mem;
1628         void __iomem *base;
1629         int uartirq = 0;
1630         int wakeirq = 0;
1631         int ret;
1632
1633         /* The optional wakeirq may be specified in the board dts file */
1634         if (pdev->dev.of_node) {
1635                 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1636                 if (!uartirq)
1637                         return -EPROBE_DEFER;
1638                 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1);
1639                 omap_up_info = of_get_uart_port_info(&pdev->dev);
1640                 pdev->dev.platform_data = omap_up_info;
1641         } else {
1642                 uartirq = platform_get_irq(pdev, 0);
1643                 if (uartirq < 0)
1644                         return -EPROBE_DEFER;
1645         }
1646
1647         up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1648         if (!up)
1649                 return -ENOMEM;
1650
1651         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1652         base = devm_ioremap_resource(&pdev->dev, mem);
1653         if (IS_ERR(base))
1654                 return PTR_ERR(base);
1655
1656         up->dev = &pdev->dev;
1657         up->port.dev = &pdev->dev;
1658         up->port.type = PORT_OMAP;
1659         up->port.iotype = UPIO_MEM;
1660         up->port.irq = uartirq;
1661         up->wakeirq = wakeirq;
1662         if (!up->wakeirq)
1663                 dev_info(up->port.dev, "no wakeirq for uart%d\n",
1664                          up->port.line);
1665
1666         up->port.regshift = 2;
1667         up->port.fifosize = 64;
1668         up->port.ops = &serial_omap_pops;
1669
1670         if (pdev->dev.of_node)
1671                 up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
1672         else
1673                 up->port.line = pdev->id;
1674
1675         if (up->port.line < 0) {
1676                 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1677                                                                 up->port.line);
1678                 ret = -ENODEV;
1679                 goto err_port_line;
1680         }
1681
1682         ret = serial_omap_probe_rs485(up, pdev->dev.of_node);
1683         if (ret < 0)
1684                 goto err_rs485;
1685
1686         sprintf(up->name, "OMAP UART%d", up->port.line);
1687         up->port.mapbase = mem->start;
1688         up->port.membase = base;
1689         up->port.flags = omap_up_info->flags;
1690         up->port.uartclk = omap_up_info->uartclk;
1691         if (!up->port.uartclk) {
1692                 up->port.uartclk = DEFAULT_CLK_SPEED;
1693                 dev_warn(&pdev->dev,
1694                          "No clock speed specified: using default: %d\n",
1695                          DEFAULT_CLK_SPEED);
1696         }
1697
1698         up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1699         up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1700         pm_qos_add_request(&up->pm_qos_request,
1701                 PM_QOS_CPU_DMA_LATENCY, up->latency);
1702         INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1703
1704         platform_set_drvdata(pdev, up);
1705         if (omap_up_info->autosuspend_timeout == 0)
1706                 omap_up_info->autosuspend_timeout = -1;
1707
1708         device_init_wakeup(up->dev, true);
1709         pm_runtime_use_autosuspend(&pdev->dev);
1710         pm_runtime_set_autosuspend_delay(&pdev->dev,
1711                         omap_up_info->autosuspend_timeout);
1712
1713         pm_runtime_irq_safe(&pdev->dev);
1714         pm_runtime_enable(&pdev->dev);
1715
1716         pm_runtime_get_sync(&pdev->dev);
1717
1718         omap_serial_fill_features_erratas(up);
1719
1720         ui[up->port.line] = up;
1721         serial_omap_add_console_port(up);
1722
1723         ret = uart_add_one_port(&serial_omap_reg, &up->port);
1724         if (ret != 0)
1725                 goto err_add_port;
1726
1727         pm_runtime_mark_last_busy(up->dev);
1728         pm_runtime_put_autosuspend(up->dev);
1729         return 0;
1730
1731 err_add_port:
1732         pm_runtime_put(&pdev->dev);
1733         pm_runtime_disable(&pdev->dev);
1734 err_rs485:
1735 err_port_line:
1736         dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1737                                 pdev->id, __func__, ret);
1738         return ret;
1739 }
1740
1741 static int serial_omap_remove(struct platform_device *dev)
1742 {
1743         struct uart_omap_port *up = platform_get_drvdata(dev);
1744
1745         pm_runtime_put_sync(up->dev);
1746         pm_runtime_disable(up->dev);
1747         uart_remove_one_port(&serial_omap_reg, &up->port);
1748         pm_qos_remove_request(&up->pm_qos_request);
1749         device_init_wakeup(&dev->dev, false);
1750
1751         return 0;
1752 }
1753
1754 /*
1755  * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1756  * The access to uart register after MDR1 Access
1757  * causes UART to corrupt data.
1758  *
1759  * Need a delay =
1760  * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1761  * give 10 times as much
1762  */
1763 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1764 {
1765         u8 timeout = 255;
1766
1767         serial_out(up, UART_OMAP_MDR1, mdr1);
1768         udelay(2);
1769         serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1770                         UART_FCR_CLEAR_RCVR);
1771         /*
1772          * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1773          * TX_FIFO_E bit is 1.
1774          */
1775         while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1776                                 (UART_LSR_THRE | UART_LSR_DR))) {
1777                 timeout--;
1778                 if (!timeout) {
1779                         /* Should *never* happen. we warn and carry on */
1780                         dev_crit(up->dev, "Errata i202: timedout %x\n",
1781                                                 serial_in(up, UART_LSR));
1782                         break;
1783                 }
1784                 udelay(1);
1785         }
1786 }
1787
1788 #ifdef CONFIG_PM_RUNTIME
1789 static void serial_omap_restore_context(struct uart_omap_port *up)
1790 {
1791         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1792                 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1793         else
1794                 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1795
1796         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1797         serial_out(up, UART_EFR, UART_EFR_ECB);
1798         serial_out(up, UART_LCR, 0x0); /* Operational mode */
1799         serial_out(up, UART_IER, 0x0);
1800         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1801         serial_out(up, UART_DLL, up->dll);
1802         serial_out(up, UART_DLM, up->dlh);
1803         serial_out(up, UART_LCR, 0x0); /* Operational mode */
1804         serial_out(up, UART_IER, up->ier);
1805         serial_out(up, UART_FCR, up->fcr);
1806         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1807         serial_out(up, UART_MCR, up->mcr);
1808         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1809         serial_out(up, UART_OMAP_SCR, up->scr);
1810         serial_out(up, UART_EFR, up->efr);
1811         serial_out(up, UART_LCR, up->lcr);
1812         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1813                 serial_omap_mdr1_errataset(up, up->mdr1);
1814         else
1815                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1816         serial_out(up, UART_OMAP_WER, up->wer);
1817 }
1818
1819 static int serial_omap_runtime_suspend(struct device *dev)
1820 {
1821         struct uart_omap_port *up = dev_get_drvdata(dev);
1822
1823         if (!up)
1824                 return -EINVAL;
1825
1826         /*
1827         * When using 'no_console_suspend', the console UART must not be
1828         * suspended. Since driver suspend is managed by runtime suspend,
1829         * preventing runtime suspend (by returning error) will keep device
1830         * active during suspend.
1831         */
1832         if (up->is_suspending && !console_suspend_enabled &&
1833             uart_console(&up->port))
1834                 return -EBUSY;
1835
1836         up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1837
1838         serial_omap_enable_wakeup(up, true);
1839
1840         up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1841         schedule_work(&up->qos_work);
1842
1843         return 0;
1844 }
1845
1846 static int serial_omap_runtime_resume(struct device *dev)
1847 {
1848         struct uart_omap_port *up = dev_get_drvdata(dev);
1849
1850         int loss_cnt = serial_omap_get_context_loss_count(up);
1851
1852         serial_omap_enable_wakeup(up, false);
1853
1854         if (loss_cnt < 0) {
1855                 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n",
1856                         loss_cnt);
1857                 serial_omap_restore_context(up);
1858         } else if (up->context_loss_cnt != loss_cnt) {
1859                 serial_omap_restore_context(up);
1860         }
1861         up->latency = up->calc_latency;
1862         schedule_work(&up->qos_work);
1863
1864         return 0;
1865 }
1866 #endif
1867
1868 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1869         SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1870         SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1871                                 serial_omap_runtime_resume, NULL)
1872         .prepare        = serial_omap_prepare,
1873         .complete       = serial_omap_complete,
1874 };
1875
1876 #if defined(CONFIG_OF)
1877 static const struct of_device_id omap_serial_of_match[] = {
1878         { .compatible = "ti,omap2-uart" },
1879         { .compatible = "ti,omap3-uart" },
1880         { .compatible = "ti,omap4-uart" },
1881         {},
1882 };
1883 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1884 #endif
1885
1886 static struct platform_driver serial_omap_driver = {
1887         .probe          = serial_omap_probe,
1888         .remove         = serial_omap_remove,
1889         .driver         = {
1890                 .name   = DRIVER_NAME,
1891                 .pm     = &serial_omap_dev_pm_ops,
1892                 .of_match_table = of_match_ptr(omap_serial_of_match),
1893         },
1894 };
1895
1896 static int __init serial_omap_init(void)
1897 {
1898         int ret;
1899
1900         ret = uart_register_driver(&serial_omap_reg);
1901         if (ret != 0)
1902                 return ret;
1903         ret = platform_driver_register(&serial_omap_driver);
1904         if (ret != 0)
1905                 uart_unregister_driver(&serial_omap_reg);
1906         return ret;
1907 }
1908
1909 static void __exit serial_omap_exit(void)
1910 {
1911         platform_driver_unregister(&serial_omap_driver);
1912         uart_unregister_driver(&serial_omap_reg);
1913 }
1914
1915 module_init(serial_omap_init);
1916 module_exit(serial_omap_exit);
1917
1918 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1919 MODULE_LICENSE("GPL");
1920 MODULE_AUTHOR("Texas Instruments Inc");