drivers/tty/serial/omap-serial.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for OMAP-UART controller.
   4  * Based on drivers/serial/8250.c
   5  *
   6  * Copyright (C) 2010 Texas Instruments.
   7  *
   8  * Authors:
   9  *      Govindraj R     <govindraj.raja@ti.com>
  10  *      Thara Gopinath  <thara@ti.com>
  11  *
  12  * Note: This driver is made separate from 8250 driver as we cannot
  13  * over load 8250 driver with omap platform specific configuration for
  14  * features like DMA, it makes easier to implement features like DMA and
  15  * hardware flow control and software flow control configuration with
  16  * this driver as required for the omap-platform.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/console.h>
  22 #include <linux/serial_reg.h>
  23 #include <linux/delay.h>
  24 #include <linux/slab.h>
  25 #include <linux/tty.h>
  26 #include <linux/tty_flip.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/io.h>
  29 #include <linux/clk.h>
  30 #include <linux/serial_core.h>
  31 #include <linux/irq.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/pm_wakeirq.h>
  34 #include <linux/of.h>
  35 #include <linux/of_irq.h>
  36 #include <linux/gpio/consumer.h>
  37 #include <linux/platform_data/serial-omap.h>
  38
  39 #define OMAP_MAX_HSUART_PORTS   10
  40
  41 #define UART_BUILD_REVISION(x, y)       (((x) << 8) | (y))
  42
  43 #define OMAP_UART_REV_42 0x0402
  44 #define OMAP_UART_REV_46 0x0406
  45 #define OMAP_UART_REV_52 0x0502
  46 #define OMAP_UART_REV_63 0x0603
  47
  48 #define OMAP_UART_TX_WAKEUP_EN          BIT(7)
  49
  50 /* Feature flags */
  51 #define OMAP_UART_WER_HAS_TX_WAKEUP     BIT(0)
  52
  53 #define UART_ERRATA_i202_MDR1_ACCESS    BIT(0)
  54 #define UART_ERRATA_i291_DMA_FORCEIDLE  BIT(1)
  55
  56 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz */
  57
  58 /* SCR register bitmasks */
  59 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK               (1 << 7)
  60 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK               (1 << 6)
  61 #define OMAP_UART_SCR_TX_EMPTY                  (1 << 3)
  62
  63 /* FCR register bitmasks */
  64 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK                 (0x3 << 6)
  65 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK                 (0x3 << 4)
  66
  67 /* MVR register bitmasks */
  68 #define OMAP_UART_MVR_SCHEME_SHIFT      30
  69
  70 #define OMAP_UART_LEGACY_MVR_MAJ_MASK   0xf0
  71 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT  4
  72 #define OMAP_UART_LEGACY_MVR_MIN_MASK   0x0f
  73
  74 #define OMAP_UART_MVR_MAJ_MASK          0x700
  75 #define OMAP_UART_MVR_MAJ_SHIFT         8
  76 #define OMAP_UART_MVR_MIN_MASK          0x3f
  77
  78 #define OMAP_UART_DMA_CH_FREE   -1
  79
  80 #define MSR_SAVE_FLAGS          UART_MSR_ANY_DELTA
  81 #define OMAP_MODE13X_SPEED      230400
  82
  83 /* WER = 0x7F
  84  * Enable module level wakeup in WER reg
  85  */
  86 #define OMAP_UART_WER_MOD_WKUP  0x7F
  87
  88 /* Enable XON/XOFF flow control on output */
  89 #define OMAP_UART_SW_TX         0x08
  90
  91 /* Enable XON/XOFF flow control on input */
  92 #define OMAP_UART_SW_RX         0x02
  93
  94 #define OMAP_UART_SW_CLR        0xF0
  95
  96 #define OMAP_UART_TCR_TRIG      0x0F
  97
  98 struct uart_omap_dma {
  99         u8                      uart_dma_tx;
 100         u8                      uart_dma_rx;
 101         int                     rx_dma_channel;
 102         int                     tx_dma_channel;
 103         dma_addr_t              rx_buf_dma_phys;
 104         dma_addr_t              tx_buf_dma_phys;
 105         unsigned int            uart_base;
 106         /*
 107          * Buffer for rx dma. It is not required for tx because the buffer
 108          * comes from port structure.
 109          */
 110         unsigned char           *rx_buf;
 111         unsigned int            prev_rx_dma_pos;
 112         int                     tx_buf_size;
 113         int                     tx_dma_used;
 114         int                     rx_dma_used;
 115         spinlock_t              tx_lock;
 116         spinlock_t              rx_lock;
 117         /* timer to poll activity on rx dma */
 118         struct timer_list       rx_timer;
 119         unsigned int            rx_buf_size;
 120         unsigned int            rx_poll_rate;
 121         unsigned int            rx_timeout;
 122 };
 123
 124 struct uart_omap_port {
 125         struct uart_port        port;
 126         struct uart_omap_dma    uart_dma;
 127         struct device           *dev;
 128         int                     wakeirq;
 129
 130         unsigned char           ier;
 131         unsigned char           lcr;
 132         unsigned char           mcr;
 133         unsigned char           fcr;
 134         unsigned char           efr;
 135         unsigned char           dll;
 136         unsigned char           dlh;
 137         unsigned char           mdr1;
 138         unsigned char           scr;
 139         unsigned char           wer;
 140
 141         int                     use_dma;
 142         /*
 143          * Some bits in registers are cleared on a read, so they must
 144          * be saved whenever the register is read, but the bits will not
 145          * be immediately processed.
 146          */
 147         unsigned int            lsr_break_flag;
 148         unsigned char           msr_saved_flags;
 149         char                    name[20];
 150         unsigned long           port_activity;
 151         int                     context_loss_cnt;
 152         u32                     errata;
 153         u32                     features;
 154
 155         struct gpio_desc        *rts_gpiod;
 156
 157         struct pm_qos_request   pm_qos_request;
 158         u32                     latency;
 159         u32                     calc_latency;
 160         struct work_struct      qos_work;
 161         bool                    is_suspending;
 162
 163         unsigned int            rs485_tx_filter_count;
 164 };
 165
 166 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
 167
 168 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 169
 170 /* Forward declaration of functions */
 171 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
 172
 173 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
 174 {
 175         offset <<= up->port.regshift;
 176         return readw(up->port.membase + offset);
 177 }
 178
 179 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
 180 {
 181         offset <<= up->port.regshift;
 182         writew(value, up->port.membase + offset);
 183 }
 184
 185 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
 186 {
 187         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 188         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 189                        UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 190         serial_out(up, UART_FCR, 0);
 191 }
 192
 193 #ifdef CONFIG_PM
 194 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
 195 {
 196         struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
 197
 198         if (!pdata || !pdata->get_context_loss_count)
 199                 return -EINVAL;
 200
 201         return pdata->get_context_loss_count(up->dev);
 202 }
 203
 204 /* REVISIT: Remove this when omap3 boots in device tree only mode */
 205 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
 206 {
 207         struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
 208
 209         if (!pdata || !pdata->enable_wakeup)
 210                 return;
 211
 212         pdata->enable_wakeup(up->dev, enable);
 213 }
 214 #endif /* CONFIG_PM */
 215
 216 /*
 217  * Calculate the absolute difference between the desired and actual baud
 218  * rate for the given mode.
 219  */
 220 static inline int calculate_baud_abs_diff(struct uart_port *port,
 221                                 unsigned int baud, unsigned int mode)
 222 {
 223         unsigned int n = port->uartclk / (mode * baud);
 224         int abs_diff;
 225
 226         if (n == 0)
 227                 n = 1;
 228
 229         abs_diff = baud - (port->uartclk / (mode * n));
 230         if (abs_diff < 0)
 231                 abs_diff = -abs_diff;
 232
 233         return abs_diff;
 234 }
 235
 236 /*
 237  * serial_omap_baud_is_mode16 - check if baud rate is MODE16X
 238  * @port: uart port info
 239  * @baud: baudrate for which mode needs to be determined
 240  *
 241  * Returns true if baud rate is MODE16X and false if MODE13X
 242  * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values,
 243  * and Error Rates" determines modes not for all common baud rates.
 244  * E.g. for 1000000 baud rate mode must be 16x, but according to that
 245  * table it's determined as 13x.
 246  */
 247 static bool
 248 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
 249 {
 250         int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13);
 251         int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16);
 252
 253         return (abs_diff_13 >= abs_diff_16);
 254 }
 255
 256 /*
 257  * serial_omap_get_divisor - calculate divisor value
 258  * @port: uart port info
 259  * @baud: baudrate for which divisor needs to be calculated.
 260  */
 261 static unsigned int
 262 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
 263 {
 264         unsigned int mode;
 265
 266         if (!serial_omap_baud_is_mode16(port, baud))
 267                 mode = 13;
 268         else
 269                 mode = 16;
 270         return port->uartclk/(mode * baud);
 271 }
 272
 273 static void serial_omap_enable_ms(struct uart_port *port)
 274 {
 275         struct uart_omap_port *up = to_uart_omap_port(port);
 276
 277         dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
 278
 279         pm_runtime_get_sync(up->dev);
 280         up->ier |= UART_IER_MSI;
 281         serial_out(up, UART_IER, up->ier);
 282         pm_runtime_mark_last_busy(up->dev);
 283         pm_runtime_put_autosuspend(up->dev);
 284 }
 285
 286 static void serial_omap_stop_tx(struct uart_port *port)
 287 {
 288         struct uart_omap_port *up = to_uart_omap_port(port);
 289         int res;
 290
 291         pm_runtime_get_sync(up->dev);
 292
 293         /* Handle RS-485 */
 294         if (port->rs485.flags & SER_RS485_ENABLED) {
 295                 if (up->scr & OMAP_UART_SCR_TX_EMPTY) {
 296                         /* THR interrupt is fired when both TX FIFO and TX
 297                          * shift register are empty. This means there's nothing
 298                          * left to transmit now, so make sure the THR interrupt
 299                          * is fired when TX FIFO is below the trigger level,
 300                          * disable THR interrupts and toggle the RS-485 GPIO
 301                          * data direction pin if needed.
 302                          */
 303                         up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
 304                         serial_out(up, UART_OMAP_SCR, up->scr);
 305                         res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ?
 306                                 1 : 0;
 307                         if (up->rts_gpiod &&
 308                             gpiod_get_value(up->rts_gpiod) != res) {
 309                                 if (port->rs485.delay_rts_after_send > 0)
 310                                         mdelay(
 311                                         port->rs485.delay_rts_after_send);
 312                                 gpiod_set_value(up->rts_gpiod, res);
 313                         }
 314                 } else {
 315                         /* We're asked to stop, but there's still stuff in the
 316                          * UART FIFO, so make sure the THR interrupt is fired
 317                          * when both TX FIFO and TX shift register are empty.
 318                          * The next THR interrupt (if no transmission is started
 319                          * in the meantime) will indicate the end of a
 320                          * transmission. Therefore we _don't_ disable THR
 321                          * interrupts in this situation.
 322                          */
 323                         up->scr |= OMAP_UART_SCR_TX_EMPTY;
 324                         serial_out(up, UART_OMAP_SCR, up->scr);
 325                         return;
 326                 }
 327         }
 328
 329         if (up->ier & UART_IER_THRI) {
 330                 up->ier &= ~UART_IER_THRI;
 331                 serial_out(up, UART_IER, up->ier);
 332         }
 333
 334         pm_runtime_mark_last_busy(up->dev);
 335         pm_runtime_put_autosuspend(up->dev);
 336 }
 337
 338 static void serial_omap_stop_rx(struct uart_port *port)
 339 {
 340         struct uart_omap_port *up = to_uart_omap_port(port);
 341
 342         pm_runtime_get_sync(up->dev);
 343         up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
 344         up->port.read_status_mask &= ~UART_LSR_DR;
 345         serial_out(up, UART_IER, up->ier);
 346         pm_runtime_mark_last_busy(up->dev);
 347         pm_runtime_put_autosuspend(up->dev);
 348 }
 349
 350 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
 351 {
 352         struct circ_buf *xmit = &up->port.state->xmit;
 353         int count;
 354
 355         if (up->port.x_char) {
 356                 serial_out(up, UART_TX, up->port.x_char);
 357                 up->port.icount.tx++;
 358                 up->port.x_char = 0;
 359                 if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
 360                     !(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
 361                         up->rs485_tx_filter_count++;
 362
 363                 return;
 364         }
 365         if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
 366                 serial_omap_stop_tx(&up->port);
 367                 return;
 368         }
 369         count = up->port.fifosize / 4;
 370         do {
 371                 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
 372                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 373                 up->port.icount.tx++;
 374                 if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
 375                     !(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
 376                         up->rs485_tx_filter_count++;
 377
 378                 if (uart_circ_empty(xmit))
 379                         break;
 380         } while (--count > 0);
 381
 382         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 383                 uart_write_wakeup(&up->port);
 384
 385         if (uart_circ_empty(xmit))
 386                 serial_omap_stop_tx(&up->port);
 387 }
 388
 389 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
 390 {
 391         if (!(up->ier & UART_IER_THRI)) {
 392                 up->ier |= UART_IER_THRI;
 393                 serial_out(up, UART_IER, up->ier);
 394         }
 395 }
 396
 397 static void serial_omap_start_tx(struct uart_port *port)
 398 {
 399         struct uart_omap_port *up = to_uart_omap_port(port);
 400         int res;
 401
 402         pm_runtime_get_sync(up->dev);
 403
 404         /* Handle RS-485 */
 405         if (port->rs485.flags & SER_RS485_ENABLED) {
 406                 /* Fire THR interrupts when FIFO is below trigger level */
 407                 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
 408                 serial_out(up, UART_OMAP_SCR, up->scr);
 409
 410                 /* if rts not already enabled */
 411                 res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
 412                 if (up->rts_gpiod && gpiod_get_value(up->rts_gpiod) != res) {
 413                         gpiod_set_value(up->rts_gpiod, res);
 414                         if (port->rs485.delay_rts_before_send > 0)
 415                                 mdelay(port->rs485.delay_rts_before_send);
 416                 }
 417         }
 418
 419         if ((port->rs485.flags & SER_RS485_ENABLED) &&
 420             !(port->rs485.flags & SER_RS485_RX_DURING_TX))
 421                 up->rs485_tx_filter_count = 0;
 422
 423         serial_omap_enable_ier_thri(up);
 424         pm_runtime_mark_last_busy(up->dev);
 425         pm_runtime_put_autosuspend(up->dev);
 426 }
 427
 428 static void serial_omap_throttle(struct uart_port *port)
 429 {
 430         struct uart_omap_port *up = to_uart_omap_port(port);
 431         unsigned long flags;
 432
 433         pm_runtime_get_sync(up->dev);
 434         spin_lock_irqsave(&up->port.lock, flags);
 435         up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
 436         serial_out(up, UART_IER, up->ier);
 437         spin_unlock_irqrestore(&up->port.lock, flags);
 438         pm_runtime_mark_last_busy(up->dev);
 439         pm_runtime_put_autosuspend(up->dev);
 440 }
 441
 442 static void serial_omap_unthrottle(struct uart_port *port)
 443 {
 444         struct uart_omap_port *up = to_uart_omap_port(port);
 445         unsigned long flags;
 446
 447         pm_runtime_get_sync(up->dev);
 448         spin_lock_irqsave(&up->port.lock, flags);
 449         up->ier |= UART_IER_RLSI | UART_IER_RDI;
 450         serial_out(up, UART_IER, up->ier);
 451         spin_unlock_irqrestore(&up->port.lock, flags);
 452         pm_runtime_mark_last_busy(up->dev);
 453         pm_runtime_put_autosuspend(up->dev);
 454 }
 455
 456 static unsigned int check_modem_status(struct uart_omap_port *up)
 457 {
 458         unsigned int status;
 459
 460         status = serial_in(up, UART_MSR);
 461         status |= up->msr_saved_flags;
 462         up->msr_saved_flags = 0;
 463         if ((status & UART_MSR_ANY_DELTA) == 0)
 464                 return status;
 465
 466         if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
 467             up->port.state != NULL) {
 468                 if (status & UART_MSR_TERI)
 469                         up->port.icount.rng++;
 470                 if (status & UART_MSR_DDSR)
 471                         up->port.icount.dsr++;
 472                 if (status & UART_MSR_DDCD)
 473                         uart_handle_dcd_change
 474                                 (&up->port, status & UART_MSR_DCD);
 475                 if (status & UART_MSR_DCTS)
 476                         uart_handle_cts_change
 477                                 (&up->port, status & UART_MSR_CTS);
 478                 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 479         }
 480
 481         return status;
 482 }
 483
 484 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
 485 {
 486         unsigned int flag;
 487
 488         /*
 489          * Read one data character out to avoid stalling the receiver according
 490          * to the table 23-246 of the omap4 TRM.
 491          */
 492         if (likely(lsr & UART_LSR_DR)) {
 493                 serial_in(up, UART_RX);
 494                 if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
 495                     !(up->port.rs485.flags & SER_RS485_RX_DURING_TX) &&
 496                     up->rs485_tx_filter_count)
 497                         up->rs485_tx_filter_count--;
 498         }
 499
 500         up->port.icount.rx++;
 501         flag = TTY_NORMAL;
 502
 503         if (lsr & UART_LSR_BI) {
 504                 flag = TTY_BREAK;
 505                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 506                 up->port.icount.brk++;
 507                 /*
 508                  * We do the SysRQ and SAK checking
 509                  * here because otherwise the break
 510                  * may get masked by ignore_status_mask
 511                  * or read_status_mask.
 512                  */
 513                 if (uart_handle_break(&up->port))
 514                         return;
 515
 516         }
 517
 518         if (lsr & UART_LSR_PE) {
 519                 flag = TTY_PARITY;
 520                 up->port.icount.parity++;
 521         }
 522
 523         if (lsr & UART_LSR_FE) {
 524                 flag = TTY_FRAME;
 525                 up->port.icount.frame++;
 526         }
 527
 528         if (lsr & UART_LSR_OE)
 529                 up->port.icount.overrun++;
 530
 531 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
 532         if (up->port.line == up->port.cons->index) {
 533                 /* Recover the break flag from console xmit */
 534                 lsr |= up->lsr_break_flag;
 535         }
 536 #endif
 537         uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
 538 }
 539
 540 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
 541 {
 542         unsigned char ch = 0;
 543         unsigned int flag;
 544
 545         if (!(lsr & UART_LSR_DR))
 546                 return;
 547
 548         ch = serial_in(up, UART_RX);
 549         if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
 550             !(up->port.rs485.flags & SER_RS485_RX_DURING_TX) &&
 551             up->rs485_tx_filter_count) {
 552                 up->rs485_tx_filter_count--;
 553                 return;
 554         }
 555
 556         flag = TTY_NORMAL;
 557         up->port.icount.rx++;
 558
 559         if (uart_handle_sysrq_char(&up->port, ch))
 560                 return;
 561
 562         uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
 563 }
 564
 565 /**
 566  * serial_omap_irq() - This handles the interrupt from one port
 567  * @irq: uart port irq number
 568  * @dev_id: uart port info
 569  */
 570 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
 571 {
 572         struct uart_omap_port *up = dev_id;
 573         unsigned int iir, lsr;
 574         unsigned int type;
 575         irqreturn_t ret = IRQ_NONE;
 576         int max_count = 256;
 577
 578         spin_lock(&up->port.lock);
 579         pm_runtime_get_sync(up->dev);
 580
 581         do {
 582                 iir = serial_in(up, UART_IIR);
 583                 if (iir & UART_IIR_NO_INT)
 584                         break;
 585
 586                 ret = IRQ_HANDLED;
 587                 lsr = serial_in(up, UART_LSR);
 588
 589                 /* extract IRQ type from IIR register */
 590                 type = iir & 0x3e;
 591
 592                 switch (type) {
 593                 case UART_IIR_MSI:
 594                         check_modem_status(up);
 595                         break;
 596                 case UART_IIR_THRI:
 597                         transmit_chars(up, lsr);
 598                         break;
 599                 case UART_IIR_RX_TIMEOUT:
 600                 case UART_IIR_RDI:
 601                         serial_omap_rdi(up, lsr);
 602                         break;
 603                 case UART_IIR_RLSI:
 604                         serial_omap_rlsi(up, lsr);
 605                         break;
 606                 case UART_IIR_CTS_RTS_DSR:
 607                         /* simply try again */
 608                         break;
 609                 case UART_IIR_XOFF:
 610                 default:
 611                         break;
 612                 }
 613         } while (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         cpu_latency_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 void __maybe_unused 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 #ifdef CONFIG_SERIAL_EARLYCON
1238 static unsigned int omap_serial_early_in(struct uart_port *port, int offset)
1239 {
1240         offset <<= port->regshift;
1241         return readw(port->membase + offset);
1242 }
1243
1244 static void omap_serial_early_out(struct uart_port *port, int offset,
1245                                   int value)
1246 {
1247         offset <<= port->regshift;
1248         writew(value, port->membase + offset);
1249 }
1250
1251 static void omap_serial_early_putc(struct uart_port *port, int c)
1252 {
1253         unsigned int status;
1254
1255         for (;;) {
1256                 status = omap_serial_early_in(port, UART_LSR);
1257                 if ((status & BOTH_EMPTY) == BOTH_EMPTY)
1258                         break;
1259                 cpu_relax();
1260         }
1261         omap_serial_early_out(port, UART_TX, c);
1262 }
1263
1264 static void early_omap_serial_write(struct console *console, const char *s,
1265                                     unsigned int count)
1266 {
1267         struct earlycon_device *device = console->data;
1268         struct uart_port *port = &device->port;
1269
1270         uart_console_write(port, s, count, omap_serial_early_putc);
1271 }
1272
1273 static int __init early_omap_serial_setup(struct earlycon_device *device,
1274                                           const char *options)
1275 {
1276         struct uart_port *port = &device->port;
1277
1278         if (!(device->port.membase || device->port.iobase))
1279                 return -ENODEV;
1280
1281         port->regshift = 2;
1282         device->con->write = early_omap_serial_write;
1283         return 0;
1284 }
1285
1286 OF_EARLYCON_DECLARE(omapserial, "ti,omap2-uart", early_omap_serial_setup);
1287 OF_EARLYCON_DECLARE(omapserial, "ti,omap3-uart", early_omap_serial_setup);
1288 OF_EARLYCON_DECLARE(omapserial, "ti,omap4-uart", early_omap_serial_setup);
1289 #endif /* CONFIG_SERIAL_EARLYCON */
1290
1291 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
1292
1293 static struct uart_driver serial_omap_reg;
1294
1295 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1296 {
1297         struct uart_omap_port *up = to_uart_omap_port(port);
1298
1299         wait_for_xmitr(up);
1300         serial_out(up, UART_TX, ch);
1301 }
1302
1303 static void
1304 serial_omap_console_write(struct console *co, const char *s,
1305                 unsigned int count)
1306 {
1307         struct uart_omap_port *up = serial_omap_console_ports[co->index];
1308         unsigned long flags;
1309         unsigned int ier;
1310         int locked = 1;
1311
1312         pm_runtime_get_sync(up->dev);
1313
1314         local_irq_save(flags);
1315         if (up->port.sysrq)
1316                 locked = 0;
1317         else if (oops_in_progress)
1318                 locked = spin_trylock(&up->port.lock);
1319         else
1320                 spin_lock(&up->port.lock);
1321
1322         /*
1323          * First save the IER then disable the interrupts
1324          */
1325         ier = serial_in(up, UART_IER);
1326         serial_out(up, UART_IER, 0);
1327
1328         uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1329
1330         /*
1331          * Finally, wait for transmitter to become empty
1332          * and restore the IER
1333          */
1334         wait_for_xmitr(up);
1335         serial_out(up, UART_IER, ier);
1336         /*
1337          * The receive handling will happen properly because the
1338          * receive ready bit will still be set; it is not cleared
1339          * on read.  However, modem control will not, we must
1340          * call it if we have saved something in the saved flags
1341          * while processing with interrupts off.
1342          */
1343         if (up->msr_saved_flags)
1344                 check_modem_status(up);
1345
1346         pm_runtime_mark_last_busy(up->dev);
1347         pm_runtime_put_autosuspend(up->dev);
1348         if (locked)
1349                 spin_unlock(&up->port.lock);
1350         local_irq_restore(flags);
1351 }
1352
1353 static int __init
1354 serial_omap_console_setup(struct console *co, char *options)
1355 {
1356         struct uart_omap_port *up;
1357         int baud = 115200;
1358         int bits = 8;
1359         int parity = 'n';
1360         int flow = 'n';
1361
1362         if (serial_omap_console_ports[co->index] == NULL)
1363                 return -ENODEV;
1364         up = serial_omap_console_ports[co->index];
1365
1366         if (options)
1367                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1368
1369         return uart_set_options(&up->port, co, baud, parity, bits, flow);
1370 }
1371
1372 static struct console serial_omap_console = {
1373         .name           = OMAP_SERIAL_NAME,
1374         .write          = serial_omap_console_write,
1375         .device         = uart_console_device,
1376         .setup          = serial_omap_console_setup,
1377         .flags          = CON_PRINTBUFFER,
1378         .index          = -1,
1379         .data           = &serial_omap_reg,
1380 };
1381
1382 static void serial_omap_add_console_port(struct uart_omap_port *up)
1383 {
1384         serial_omap_console_ports[up->port.line] = up;
1385 }
1386
1387 #define OMAP_CONSOLE    (&serial_omap_console)
1388
1389 #else
1390
1391 #define OMAP_CONSOLE    NULL
1392
1393 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1394 {}
1395
1396 #endif
1397
1398 /* Enable or disable the rs485 support */
1399 static int
1400 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
1401 {
1402         struct uart_omap_port *up = to_uart_omap_port(port);
1403         unsigned int mode;
1404         int val;
1405
1406         pm_runtime_get_sync(up->dev);
1407
1408         /* Disable interrupts from this port */
1409         mode = up->ier;
1410         up->ier = 0;
1411         serial_out(up, UART_IER, 0);
1412
1413         /* Clamp the delays to [0, 100ms] */
1414         rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
1415         rs485->delay_rts_after_send  = min(rs485->delay_rts_after_send, 100U);
1416
1417         /* store new config */
1418         port->rs485 = *rs485;
1419
1420         if (up->rts_gpiod) {
1421                 /* enable / disable rts */
1422                 val = (port->rs485.flags & SER_RS485_ENABLED) ?
1423                         SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
1424                 val = (port->rs485.flags & val) ? 1 : 0;
1425                 gpiod_set_value(up->rts_gpiod, val);
1426         }
1427
1428         /* Enable interrupts */
1429         up->ier = mode;
1430         serial_out(up, UART_IER, up->ier);
1431
1432         /* If RS-485 is disabled, make sure the THR interrupt is fired when
1433          * TX FIFO is below the trigger level.
1434          */
1435         if (!(port->rs485.flags & SER_RS485_ENABLED) &&
1436             (up->scr & OMAP_UART_SCR_TX_EMPTY)) {
1437                 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
1438                 serial_out(up, UART_OMAP_SCR, up->scr);
1439         }
1440
1441         pm_runtime_mark_last_busy(up->dev);
1442         pm_runtime_put_autosuspend(up->dev);
1443
1444         return 0;
1445 }
1446
1447 static const struct uart_ops serial_omap_pops = {
1448         .tx_empty       = serial_omap_tx_empty,
1449         .set_mctrl      = serial_omap_set_mctrl,
1450         .get_mctrl      = serial_omap_get_mctrl,
1451         .stop_tx        = serial_omap_stop_tx,
1452         .start_tx       = serial_omap_start_tx,
1453         .throttle       = serial_omap_throttle,
1454         .unthrottle     = serial_omap_unthrottle,
1455         .stop_rx        = serial_omap_stop_rx,
1456         .enable_ms      = serial_omap_enable_ms,
1457         .break_ctl      = serial_omap_break_ctl,
1458         .startup        = serial_omap_startup,
1459         .shutdown       = serial_omap_shutdown,
1460         .set_termios    = serial_omap_set_termios,
1461         .pm             = serial_omap_pm,
1462         .type           = serial_omap_type,
1463         .release_port   = serial_omap_release_port,
1464         .request_port   = serial_omap_request_port,
1465         .config_port    = serial_omap_config_port,
1466         .verify_port    = serial_omap_verify_port,
1467 #ifdef CONFIG_CONSOLE_POLL
1468         .poll_put_char  = serial_omap_poll_put_char,
1469         .poll_get_char  = serial_omap_poll_get_char,
1470 #endif
1471 };
1472
1473 static struct uart_driver serial_omap_reg = {
1474         .owner          = THIS_MODULE,
1475         .driver_name    = "OMAP-SERIAL",
1476         .dev_name       = OMAP_SERIAL_NAME,
1477         .nr             = OMAP_MAX_HSUART_PORTS,
1478         .cons           = OMAP_CONSOLE,
1479 };
1480
1481 #ifdef CONFIG_PM_SLEEP
1482 static int serial_omap_prepare(struct device *dev)
1483 {
1484         struct uart_omap_port *up = dev_get_drvdata(dev);
1485
1486         up->is_suspending = true;
1487
1488         return 0;
1489 }
1490
1491 static void serial_omap_complete(struct device *dev)
1492 {
1493         struct uart_omap_port *up = dev_get_drvdata(dev);
1494
1495         up->is_suspending = false;
1496 }
1497
1498 static int serial_omap_suspend(struct device *dev)
1499 {
1500         struct uart_omap_port *up = dev_get_drvdata(dev);
1501
1502         uart_suspend_port(&serial_omap_reg, &up->port);
1503         flush_work(&up->qos_work);
1504
1505         if (device_may_wakeup(dev))
1506                 serial_omap_enable_wakeup(up, true);
1507         else
1508                 serial_omap_enable_wakeup(up, false);
1509
1510         return 0;
1511 }
1512
1513 static int serial_omap_resume(struct device *dev)
1514 {
1515         struct uart_omap_port *up = dev_get_drvdata(dev);
1516
1517         if (device_may_wakeup(dev))
1518                 serial_omap_enable_wakeup(up, false);
1519
1520         uart_resume_port(&serial_omap_reg, &up->port);
1521
1522         return 0;
1523 }
1524 #else
1525 #define serial_omap_prepare NULL
1526 #define serial_omap_complete NULL
1527 #endif /* CONFIG_PM_SLEEP */
1528
1529 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
1530 {
1531         u32 mvr, scheme;
1532         u16 revision, major, minor;
1533
1534         mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
1535
1536         /* Check revision register scheme */
1537         scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1538
1539         switch (scheme) {
1540         case 0: /* Legacy Scheme: OMAP2/3 */
1541                 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1542                 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1543                                         OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1544                 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1545                 break;
1546         case 1:
1547                 /* New Scheme: OMAP4+ */
1548                 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1549                 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1550                                         OMAP_UART_MVR_MAJ_SHIFT;
1551                 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1552                 break;
1553         default:
1554                 dev_warn(up->dev,
1555                         "Unknown %s revision, defaulting to highest\n",
1556                         up->name);
1557                 /* highest possible revision */
1558                 major = 0xff;
1559                 minor = 0xff;
1560         }
1561
1562         /* normalize revision for the driver */
1563         revision = UART_BUILD_REVISION(major, minor);
1564
1565         switch (revision) {
1566         case OMAP_UART_REV_46:
1567                 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1568                                 UART_ERRATA_i291_DMA_FORCEIDLE);
1569                 break;
1570         case OMAP_UART_REV_52:
1571                 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1572                                 UART_ERRATA_i291_DMA_FORCEIDLE);
1573                 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1574                 break;
1575         case OMAP_UART_REV_63:
1576                 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1577                 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1578                 break;
1579         default:
1580                 break;
1581         }
1582 }
1583
1584 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1585 {
1586         struct omap_uart_port_info *omap_up_info;
1587
1588         omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1589         if (!omap_up_info)
1590                 return NULL; /* out of memory */
1591
1592         of_property_read_u32(dev->of_node, "clock-frequency",
1593                                          &omap_up_info->uartclk);
1594
1595         omap_up_info->flags = UPF_BOOT_AUTOCONF;
1596
1597         return omap_up_info;
1598 }
1599
1600 static int serial_omap_probe_rs485(struct uart_omap_port *up,
1601                                    struct device *dev)
1602 {
1603         struct serial_rs485 *rs485conf = &up->port.rs485;
1604         struct device_node *np = dev->of_node;
1605         enum gpiod_flags gflags;
1606         int ret;
1607
1608         rs485conf->flags = 0;
1609         up->rts_gpiod = NULL;
1610
1611         if (!np)
1612                 return 0;
1613
1614         ret = uart_get_rs485_mode(&up->port);
1615         if (ret)
1616                 return ret;
1617
1618         if (of_property_read_bool(np, "rs485-rts-active-high")) {
1619                 rs485conf->flags |= SER_RS485_RTS_ON_SEND;
1620                 rs485conf->flags &= ~SER_RS485_RTS_AFTER_SEND;
1621         } else {
1622                 rs485conf->flags &= ~SER_RS485_RTS_ON_SEND;
1623                 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
1624         }
1625
1626         /* check for tx enable gpio */
1627         gflags = rs485conf->flags & SER_RS485_RTS_AFTER_SEND ?
1628                 GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
1629         up->rts_gpiod = devm_gpiod_get_optional(dev, "rts", gflags);
1630         if (IS_ERR(up->rts_gpiod)) {
1631                 ret = PTR_ERR(up->rts_gpiod);
1632                 if (ret == -EPROBE_DEFER)
1633                         return ret;
1634                 /*
1635                  * FIXME: the code historically ignored any other error than
1636                  * -EPROBE_DEFER and just went on without GPIO.
1637                  */
1638                 up->rts_gpiod = NULL;
1639         } else {
1640                 gpiod_set_consumer_name(up->rts_gpiod, "omap-serial");
1641         }
1642
1643         return 0;
1644 }
1645
1646 static int serial_omap_probe(struct platform_device *pdev)
1647 {
1648         struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
1649         struct uart_omap_port *up;
1650         struct resource *mem;
1651         void __iomem *base;
1652         int uartirq = 0;
1653         int wakeirq = 0;
1654         int ret;
1655
1656         /* The optional wakeirq may be specified in the board dts file */
1657         if (pdev->dev.of_node) {
1658                 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1659                 if (!uartirq)
1660                         return -EPROBE_DEFER;
1661                 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1);
1662                 omap_up_info = of_get_uart_port_info(&pdev->dev);
1663                 pdev->dev.platform_data = omap_up_info;
1664         } else {
1665                 uartirq = platform_get_irq(pdev, 0);
1666                 if (uartirq < 0)
1667                         return -EPROBE_DEFER;
1668         }
1669
1670         up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1671         if (!up)
1672                 return -ENOMEM;
1673
1674         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1675         base = devm_ioremap_resource(&pdev->dev, mem);
1676         if (IS_ERR(base))
1677                 return PTR_ERR(base);
1678
1679         up->dev = &pdev->dev;
1680         up->port.dev = &pdev->dev;
1681         up->port.type = PORT_OMAP;
1682         up->port.iotype = UPIO_MEM;
1683         up->port.irq = uartirq;
1684         up->port.regshift = 2;
1685         up->port.fifosize = 64;
1686         up->port.ops = &serial_omap_pops;
1687         up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_OMAP_CONSOLE);
1688
1689         if (pdev->dev.of_node)
1690                 ret = of_alias_get_id(pdev->dev.of_node, "serial");
1691         else
1692                 ret = pdev->id;
1693
1694         if (ret < 0) {
1695                 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1696                         ret);
1697                 goto err_port_line;
1698         }
1699         up->port.line = ret;
1700
1701         if (up->port.line >= OMAP_MAX_HSUART_PORTS) {
1702                 dev_err(&pdev->dev, "uart ID %d >  MAX %d.\n", up->port.line,
1703                         OMAP_MAX_HSUART_PORTS);
1704                 ret = -ENXIO;
1705                 goto err_port_line;
1706         }
1707
1708         up->wakeirq = wakeirq;
1709         if (!up->wakeirq)
1710                 dev_info(up->port.dev, "no wakeirq for uart%d\n",
1711                          up->port.line);
1712
1713         ret = serial_omap_probe_rs485(up, &pdev->dev);
1714         if (ret < 0)
1715                 goto err_rs485;
1716
1717         sprintf(up->name, "OMAP UART%d", up->port.line);
1718         up->port.mapbase = mem->start;
1719         up->port.membase = base;
1720         up->port.flags = omap_up_info->flags;
1721         up->port.uartclk = omap_up_info->uartclk;
1722         up->port.rs485_config = serial_omap_config_rs485;
1723         if (!up->port.uartclk) {
1724                 up->port.uartclk = DEFAULT_CLK_SPEED;
1725                 dev_warn(&pdev->dev,
1726                          "No clock speed specified: using default: %d\n",
1727                          DEFAULT_CLK_SPEED);
1728         }
1729
1730         up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
1731         up->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
1732         cpu_latency_qos_add_request(&up->pm_qos_request, up->latency);
1733         INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1734
1735         platform_set_drvdata(pdev, up);
1736         if (omap_up_info->autosuspend_timeout == 0)
1737                 omap_up_info->autosuspend_timeout = -1;
1738
1739         device_init_wakeup(up->dev, true);
1740         pm_runtime_use_autosuspend(&pdev->dev);
1741         pm_runtime_set_autosuspend_delay(&pdev->dev,
1742                         omap_up_info->autosuspend_timeout);
1743
1744         pm_runtime_irq_safe(&pdev->dev);
1745         pm_runtime_enable(&pdev->dev);
1746
1747         pm_runtime_get_sync(&pdev->dev);
1748
1749         omap_serial_fill_features_erratas(up);
1750
1751         ui[up->port.line] = up;
1752         serial_omap_add_console_port(up);
1753
1754         ret = uart_add_one_port(&serial_omap_reg, &up->port);
1755         if (ret != 0)
1756                 goto err_add_port;
1757
1758         pm_runtime_mark_last_busy(up->dev);
1759         pm_runtime_put_autosuspend(up->dev);
1760         return 0;
1761
1762 err_add_port:
1763         pm_runtime_dont_use_autosuspend(&pdev->dev);
1764         pm_runtime_put_sync(&pdev->dev);
1765         pm_runtime_disable(&pdev->dev);
1766         cpu_latency_qos_remove_request(&up->pm_qos_request);
1767         device_init_wakeup(up->dev, false);
1768 err_rs485:
1769 err_port_line:
1770         return ret;
1771 }
1772
1773 static int serial_omap_remove(struct platform_device *dev)
1774 {
1775         struct uart_omap_port *up = platform_get_drvdata(dev);
1776
1777         pm_runtime_get_sync(up->dev);
1778
1779         uart_remove_one_port(&serial_omap_reg, &up->port);
1780
1781         pm_runtime_dont_use_autosuspend(up->dev);
1782         pm_runtime_put_sync(up->dev);
1783         pm_runtime_disable(up->dev);
1784         cpu_latency_qos_remove_request(&up->pm_qos_request);
1785         device_init_wakeup(&dev->dev, false);
1786
1787         return 0;
1788 }
1789
1790 /*
1791  * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1792  * The access to uart register after MDR1 Access
1793  * causes UART to corrupt data.
1794  *
1795  * Need a delay =
1796  * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1797  * give 10 times as much
1798  */
1799 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1800 {
1801         u8 timeout = 255;
1802
1803         serial_out(up, UART_OMAP_MDR1, mdr1);
1804         udelay(2);
1805         serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1806                         UART_FCR_CLEAR_RCVR);
1807         /*
1808          * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1809          * TX_FIFO_E bit is 1.
1810          */
1811         while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1812                                 (UART_LSR_THRE | UART_LSR_DR))) {
1813                 timeout--;
1814                 if (!timeout) {
1815                         /* Should *never* happen. we warn and carry on */
1816                         dev_crit(up->dev, "Errata i202: timedout %x\n",
1817                                                 serial_in(up, UART_LSR));
1818                         break;
1819                 }
1820                 udelay(1);
1821         }
1822 }
1823
1824 #ifdef CONFIG_PM
1825 static void serial_omap_restore_context(struct uart_omap_port *up)
1826 {
1827         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1828                 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1829         else
1830                 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1831
1832         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1833         serial_out(up, UART_EFR, UART_EFR_ECB);
1834         serial_out(up, UART_LCR, 0x0); /* Operational mode */
1835         serial_out(up, UART_IER, 0x0);
1836         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1837         serial_out(up, UART_DLL, up->dll);
1838         serial_out(up, UART_DLM, up->dlh);
1839         serial_out(up, UART_LCR, 0x0); /* Operational mode */
1840         serial_out(up, UART_IER, up->ier);
1841         serial_out(up, UART_FCR, up->fcr);
1842         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1843         serial_out(up, UART_MCR, up->mcr);
1844         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1845         serial_out(up, UART_OMAP_SCR, up->scr);
1846         serial_out(up, UART_EFR, up->efr);
1847         serial_out(up, UART_LCR, up->lcr);
1848         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1849                 serial_omap_mdr1_errataset(up, up->mdr1);
1850         else
1851                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1852         serial_out(up, UART_OMAP_WER, up->wer);
1853 }
1854
1855 static int serial_omap_runtime_suspend(struct device *dev)
1856 {
1857         struct uart_omap_port *up = dev_get_drvdata(dev);
1858
1859         if (!up)
1860                 return -EINVAL;
1861
1862         /*
1863         * When using 'no_console_suspend', the console UART must not be
1864         * suspended. Since driver suspend is managed by runtime suspend,
1865         * preventing runtime suspend (by returning error) will keep device
1866         * active during suspend.
1867         */
1868         if (up->is_suspending && !console_suspend_enabled &&
1869             uart_console(&up->port))
1870                 return -EBUSY;
1871
1872         up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1873
1874         serial_omap_enable_wakeup(up, true);
1875
1876         up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
1877         schedule_work(&up->qos_work);
1878
1879         return 0;
1880 }
1881
1882 static int serial_omap_runtime_resume(struct device *dev)
1883 {
1884         struct uart_omap_port *up = dev_get_drvdata(dev);
1885
1886         int loss_cnt = serial_omap_get_context_loss_count(up);
1887
1888         serial_omap_enable_wakeup(up, false);
1889
1890         if (loss_cnt < 0) {
1891                 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n",
1892                         loss_cnt);
1893                 serial_omap_restore_context(up);
1894         } else if (up->context_loss_cnt != loss_cnt) {
1895                 serial_omap_restore_context(up);
1896         }
1897         up->latency = up->calc_latency;
1898         schedule_work(&up->qos_work);
1899
1900         return 0;
1901 }
1902 #endif
1903
1904 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1905         SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1906         SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1907                                 serial_omap_runtime_resume, NULL)
1908         .prepare        = serial_omap_prepare,
1909         .complete       = serial_omap_complete,
1910 };
1911
1912 #if defined(CONFIG_OF)
1913 static const struct of_device_id omap_serial_of_match[] = {
1914         { .compatible = "ti,omap2-uart" },
1915         { .compatible = "ti,omap3-uart" },
1916         { .compatible = "ti,omap4-uart" },
1917         {},
1918 };
1919 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1920 #endif
1921
1922 static struct platform_driver serial_omap_driver = {
1923         .probe          = serial_omap_probe,
1924         .remove         = serial_omap_remove,
1925         .driver         = {
1926                 .name   = OMAP_SERIAL_DRIVER_NAME,
1927                 .pm     = &serial_omap_dev_pm_ops,
1928                 .of_match_table = of_match_ptr(omap_serial_of_match),
1929         },
1930 };
1931
1932 static int __init serial_omap_init(void)
1933 {
1934         int ret;
1935
1936         ret = uart_register_driver(&serial_omap_reg);
1937         if (ret != 0)
1938                 return ret;
1939         ret = platform_driver_register(&serial_omap_driver);
1940         if (ret != 0)
1941                 uart_unregister_driver(&serial_omap_reg);
1942         return ret;
1943 }
1944
1945 static void __exit serial_omap_exit(void)
1946 {
1947         platform_driver_unregister(&serial_omap_driver);
1948         uart_unregister_driver(&serial_omap_reg);
1949 }
1950
1951 module_init(serial_omap_init);
1952 module_exit(serial_omap_exit);
1953
1954 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1955 MODULE_LICENSE("GPL");
1956 MODULE_AUTHOR("Texas Instruments Inc");