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 int DTR_gpio; 167 int DTR_inverted; 168 int DTR_active; 169 170 struct serial_rs485 rs485; 171 int rts_gpio; 172 173 struct pm_qos_request pm_qos_request; 174 u32 latency; 175 u32 calc_latency; 176 struct work_struct qos_work; 177 bool is_suspending; 178 }; 179 180 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port))) 181 182 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 183 184 /* Forward declaration of functions */ 185 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 186 187 static struct workqueue_struct *serial_omap_uart_wq; 188 189 static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 190 { 191 offset <<= up->port.regshift; 192 return readw(up->port.membase + offset); 193 } 194 195 static inline void serial_out(struct uart_omap_port *up, int offset, int value) 196 { 197 offset <<= up->port.regshift; 198 writew(value, up->port.membase + offset); 199 } 200 201 static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 202 { 203 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 204 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 205 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 206 serial_out(up, UART_FCR, 0); 207 } 208 209 static int serial_omap_get_context_loss_count(struct uart_omap_port *up) 210 { 211 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev); 212 213 if (!pdata || !pdata->get_context_loss_count) 214 return -EINVAL; 215 216 return pdata->get_context_loss_count(up->dev); 217 } 218 219 static inline void serial_omap_enable_wakeirq(struct uart_omap_port *up, 220 bool enable) 221 { 222 if (!up->wakeirq) 223 return; 224 225 if (enable) 226 enable_irq(up->wakeirq); 227 else 228 disable_irq(up->wakeirq); 229 } 230 231 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable) 232 { 233 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev); 234 235 serial_omap_enable_wakeirq(up, enable); 236 if (!pdata || !pdata->enable_wakeup) 237 return; 238 239 pdata->enable_wakeup(up->dev, enable); 240 } 241 242 /* 243 * serial_omap_baud_is_mode16 - check if baud rate is MODE16X 244 * @port: uart port info 245 * @baud: baudrate for which mode needs to be determined 246 * 247 * Returns true if baud rate is MODE16X and false if MODE13X 248 * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values, 249 * and Error Rates" determines modes not for all common baud rates. 250 * E.g. for 1000000 baud rate mode must be 16x, but according to that 251 * table it's determined as 13x. 252 */ 253 static bool 254 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud) 255 { 256 unsigned int n13 = port->uartclk / (13 * baud); 257 unsigned int n16 = port->uartclk / (16 * baud); 258 int baudAbsDiff13 = baud - (port->uartclk / (13 * n13)); 259 int baudAbsDiff16 = baud - (port->uartclk / (16 * n16)); 260 if (baudAbsDiff13 < 0) 261 baudAbsDiff13 = -baudAbsDiff13; 262 if (baudAbsDiff16 < 0) 263 baudAbsDiff16 = -baudAbsDiff16; 264 265 return (baudAbsDiff13 >= baudAbsDiff16); 266 } 267 268 /* 269 * serial_omap_get_divisor - calculate divisor value 270 * @port: uart port info 271 * @baud: baudrate for which divisor needs to be calculated. 272 */ 273 static unsigned int 274 serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 275 { 276 unsigned int mode; 277 278 if (!serial_omap_baud_is_mode16(port, baud)) 279 mode = 13; 280 else 281 mode = 16; 282 return port->uartclk/(mode * baud); 283 } 284 285 static void serial_omap_enable_ms(struct uart_port *port) 286 { 287 struct uart_omap_port *up = to_uart_omap_port(port); 288 289 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); 290 291 pm_runtime_get_sync(up->dev); 292 up->ier |= UART_IER_MSI; 293 serial_out(up, UART_IER, up->ier); 294 pm_runtime_mark_last_busy(up->dev); 295 pm_runtime_put_autosuspend(up->dev); 296 } 297 298 static void serial_omap_stop_tx(struct uart_port *port) 299 { 300 struct uart_omap_port *up = to_uart_omap_port(port); 301 int res; 302 303 pm_runtime_get_sync(up->dev); 304 305 /* Handle RS-485 */ 306 if (up->rs485.flags & SER_RS485_ENABLED) { 307 if (up->scr & OMAP_UART_SCR_TX_EMPTY) { 308 /* THR interrupt is fired when both TX FIFO and TX 309 * shift register are empty. This means there's nothing 310 * left to transmit now, so make sure the THR interrupt 311 * is fired when TX FIFO is below the trigger level, 312 * disable THR interrupts and toggle the RS-485 GPIO 313 * data direction pin if needed. 314 */ 315 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 316 serial_out(up, UART_OMAP_SCR, up->scr); 317 res = (up->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 1 : 0; 318 if (gpio_get_value(up->rts_gpio) != res) { 319 if (up->rs485.delay_rts_after_send > 0) 320 mdelay(up->rs485.delay_rts_after_send); 321 gpio_set_value(up->rts_gpio, res); 322 } 323 } else { 324 /* We're asked to stop, but there's still stuff in the 325 * UART FIFO, so make sure the THR interrupt is fired 326 * when both TX FIFO and TX shift register are empty. 327 * The next THR interrupt (if no transmission is started 328 * in the meantime) will indicate the end of a 329 * transmission. Therefore we _don't_ disable THR 330 * interrupts in this situation. 331 */ 332 up->scr |= OMAP_UART_SCR_TX_EMPTY; 333 serial_out(up, UART_OMAP_SCR, up->scr); 334 return; 335 } 336 } 337 338 if (up->ier & UART_IER_THRI) { 339 up->ier &= ~UART_IER_THRI; 340 serial_out(up, UART_IER, up->ier); 341 } 342 343 if ((up->rs485.flags & SER_RS485_ENABLED) && 344 !(up->rs485.flags & SER_RS485_RX_DURING_TX)) { 345 up->ier = UART_IER_RLSI | UART_IER_RDI; 346 serial_out(up, UART_IER, up->ier); 347 } 348 349 pm_runtime_mark_last_busy(up->dev); 350 pm_runtime_put_autosuspend(up->dev); 351 } 352 353 static void serial_omap_stop_rx(struct uart_port *port) 354 { 355 struct uart_omap_port *up = to_uart_omap_port(port); 356 357 pm_runtime_get_sync(up->dev); 358 up->ier &= ~UART_IER_RLSI; 359 up->port.read_status_mask &= ~UART_LSR_DR; 360 serial_out(up, UART_IER, up->ier); 361 pm_runtime_mark_last_busy(up->dev); 362 pm_runtime_put_autosuspend(up->dev); 363 } 364 365 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr) 366 { 367 struct circ_buf *xmit = &up->port.state->xmit; 368 int count; 369 370 if (up->port.x_char) { 371 serial_out(up, UART_TX, up->port.x_char); 372 up->port.icount.tx++; 373 up->port.x_char = 0; 374 return; 375 } 376 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 377 serial_omap_stop_tx(&up->port); 378 return; 379 } 380 count = up->port.fifosize / 4; 381 do { 382 serial_out(up, UART_TX, xmit->buf[xmit->tail]); 383 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 384 up->port.icount.tx++; 385 if (uart_circ_empty(xmit)) 386 break; 387 } while (--count > 0); 388 389 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { 390 spin_unlock(&up->port.lock); 391 uart_write_wakeup(&up->port); 392 spin_lock(&up->port.lock); 393 } 394 395 if (uart_circ_empty(xmit)) 396 serial_omap_stop_tx(&up->port); 397 } 398 399 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 400 { 401 if (!(up->ier & UART_IER_THRI)) { 402 up->ier |= UART_IER_THRI; 403 serial_out(up, UART_IER, up->ier); 404 } 405 } 406 407 static void serial_omap_start_tx(struct uart_port *port) 408 { 409 struct uart_omap_port *up = to_uart_omap_port(port); 410 int res; 411 412 pm_runtime_get_sync(up->dev); 413 414 /* Handle RS-485 */ 415 if (up->rs485.flags & SER_RS485_ENABLED) { 416 /* Fire THR interrupts when FIFO is below trigger level */ 417 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 418 serial_out(up, UART_OMAP_SCR, up->scr); 419 420 /* if rts not already enabled */ 421 res = (up->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0; 422 if (gpio_get_value(up->rts_gpio) != res) { 423 gpio_set_value(up->rts_gpio, res); 424 if (up->rs485.delay_rts_before_send > 0) 425 mdelay(up->rs485.delay_rts_before_send); 426 } 427 } 428 429 if ((up->rs485.flags & SER_RS485_ENABLED) && 430 !(up->rs485.flags & SER_RS485_RX_DURING_TX)) 431 serial_omap_stop_rx(port); 432 433 serial_omap_enable_ier_thri(up); 434 pm_runtime_mark_last_busy(up->dev); 435 pm_runtime_put_autosuspend(up->dev); 436 } 437 438 static void serial_omap_throttle(struct uart_port *port) 439 { 440 struct uart_omap_port *up = to_uart_omap_port(port); 441 unsigned long flags; 442 443 pm_runtime_get_sync(up->dev); 444 spin_lock_irqsave(&up->port.lock, flags); 445 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); 446 serial_out(up, UART_IER, up->ier); 447 spin_unlock_irqrestore(&up->port.lock, flags); 448 pm_runtime_mark_last_busy(up->dev); 449 pm_runtime_put_autosuspend(up->dev); 450 } 451 452 static void serial_omap_unthrottle(struct uart_port *port) 453 { 454 struct uart_omap_port *up = to_uart_omap_port(port); 455 unsigned long flags; 456 457 pm_runtime_get_sync(up->dev); 458 spin_lock_irqsave(&up->port.lock, flags); 459 up->ier |= UART_IER_RLSI | UART_IER_RDI; 460 serial_out(up, UART_IER, up->ier); 461 spin_unlock_irqrestore(&up->port.lock, flags); 462 pm_runtime_mark_last_busy(up->dev); 463 pm_runtime_put_autosuspend(up->dev); 464 } 465 466 static unsigned int check_modem_status(struct uart_omap_port *up) 467 { 468 unsigned int status; 469 470 status = serial_in(up, UART_MSR); 471 status |= up->msr_saved_flags; 472 up->msr_saved_flags = 0; 473 if ((status & UART_MSR_ANY_DELTA) == 0) 474 return status; 475 476 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 477 up->port.state != NULL) { 478 if (status & UART_MSR_TERI) 479 up->port.icount.rng++; 480 if (status & UART_MSR_DDSR) 481 up->port.icount.dsr++; 482 if (status & UART_MSR_DDCD) 483 uart_handle_dcd_change 484 (&up->port, status & UART_MSR_DCD); 485 if (status & UART_MSR_DCTS) 486 uart_handle_cts_change 487 (&up->port, status & UART_MSR_CTS); 488 wake_up_interruptible(&up->port.state->port.delta_msr_wait); 489 } 490 491 return status; 492 } 493 494 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr) 495 { 496 unsigned int flag; 497 unsigned char ch = 0; 498 499 if (likely(lsr & UART_LSR_DR)) 500 ch = serial_in(up, UART_RX); 501 502 up->port.icount.rx++; 503 flag = TTY_NORMAL; 504 505 if (lsr & UART_LSR_BI) { 506 flag = TTY_BREAK; 507 lsr &= ~(UART_LSR_FE | UART_LSR_PE); 508 up->port.icount.brk++; 509 /* 510 * We do the SysRQ and SAK checking 511 * here because otherwise the break 512 * may get masked by ignore_status_mask 513 * or read_status_mask. 514 */ 515 if (uart_handle_break(&up->port)) 516 return; 517 518 } 519 520 if (lsr & UART_LSR_PE) { 521 flag = TTY_PARITY; 522 up->port.icount.parity++; 523 } 524 525 if (lsr & UART_LSR_FE) { 526 flag = TTY_FRAME; 527 up->port.icount.frame++; 528 } 529 530 if (lsr & UART_LSR_OE) 531 up->port.icount.overrun++; 532 533 #ifdef CONFIG_SERIAL_OMAP_CONSOLE 534 if (up->port.line == up->port.cons->index) { 535 /* Recover the break flag from console xmit */ 536 lsr |= up->lsr_break_flag; 537 } 538 #endif 539 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag); 540 } 541 542 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr) 543 { 544 unsigned char ch = 0; 545 unsigned int flag; 546 547 if (!(lsr & UART_LSR_DR)) 548 return; 549 550 ch = serial_in(up, UART_RX); 551 flag = TTY_NORMAL; 552 up->port.icount.rx++; 553 554 if (uart_handle_sysrq_char(&up->port, ch)) 555 return; 556 557 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 558 } 559 560 /** 561 * serial_omap_irq() - This handles the interrupt from one port 562 * @irq: uart port irq number 563 * @dev_id: uart port info 564 */ 565 static irqreturn_t serial_omap_irq(int irq, void *dev_id) 566 { 567 struct uart_omap_port *up = dev_id; 568 unsigned int iir, lsr; 569 unsigned int type; 570 irqreturn_t ret = IRQ_NONE; 571 int max_count = 256; 572 573 spin_lock(&up->port.lock); 574 pm_runtime_get_sync(up->dev); 575 576 do { 577 iir = serial_in(up, UART_IIR); 578 if (iir & UART_IIR_NO_INT) 579 break; 580 581 ret = IRQ_HANDLED; 582 lsr = serial_in(up, UART_LSR); 583 584 /* extract IRQ type from IIR register */ 585 type = iir & 0x3e; 586 587 switch (type) { 588 case UART_IIR_MSI: 589 check_modem_status(up); 590 break; 591 case UART_IIR_THRI: 592 transmit_chars(up, lsr); 593 break; 594 case UART_IIR_RX_TIMEOUT: 595 /* FALLTHROUGH */ 596 case UART_IIR_RDI: 597 serial_omap_rdi(up, lsr); 598 break; 599 case UART_IIR_RLSI: 600 serial_omap_rlsi(up, lsr); 601 break; 602 case UART_IIR_CTS_RTS_DSR: 603 /* simply try again */ 604 break; 605 case UART_IIR_XOFF: 606 /* FALLTHROUGH */ 607 default: 608 break; 609 } 610 } while (!(iir & UART_IIR_NO_INT) && max_count--); 611 612 spin_unlock(&up->port.lock); 613 614 tty_flip_buffer_push(&up->port.state->port); 615 616 pm_runtime_mark_last_busy(up->dev); 617 pm_runtime_put_autosuspend(up->dev); 618 up->port_activity = jiffies; 619 620 return ret; 621 } 622 623 static unsigned int serial_omap_tx_empty(struct uart_port *port) 624 { 625 struct uart_omap_port *up = to_uart_omap_port(port); 626 unsigned long flags = 0; 627 unsigned int ret = 0; 628 629 pm_runtime_get_sync(up->dev); 630 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); 631 spin_lock_irqsave(&up->port.lock, flags); 632 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 633 spin_unlock_irqrestore(&up->port.lock, flags); 634 pm_runtime_mark_last_busy(up->dev); 635 pm_runtime_put_autosuspend(up->dev); 636 return ret; 637 } 638 639 static unsigned int serial_omap_get_mctrl(struct uart_port *port) 640 { 641 struct uart_omap_port *up = to_uart_omap_port(port); 642 unsigned int status; 643 unsigned int ret = 0; 644 645 pm_runtime_get_sync(up->dev); 646 status = check_modem_status(up); 647 pm_runtime_mark_last_busy(up->dev); 648 pm_runtime_put_autosuspend(up->dev); 649 650 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); 651 652 if (status & UART_MSR_DCD) 653 ret |= TIOCM_CAR; 654 if (status & UART_MSR_RI) 655 ret |= TIOCM_RNG; 656 if (status & UART_MSR_DSR) 657 ret |= TIOCM_DSR; 658 if (status & UART_MSR_CTS) 659 ret |= TIOCM_CTS; 660 return ret; 661 } 662 663 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 664 { 665 struct uart_omap_port *up = to_uart_omap_port(port); 666 unsigned char mcr = 0, old_mcr; 667 668 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); 669 if (mctrl & TIOCM_RTS) 670 mcr |= UART_MCR_RTS; 671 if (mctrl & TIOCM_DTR) 672 mcr |= UART_MCR_DTR; 673 if (mctrl & TIOCM_OUT1) 674 mcr |= UART_MCR_OUT1; 675 if (mctrl & TIOCM_OUT2) 676 mcr |= UART_MCR_OUT2; 677 if (mctrl & TIOCM_LOOP) 678 mcr |= UART_MCR_LOOP; 679 680 pm_runtime_get_sync(up->dev); 681 old_mcr = serial_in(up, UART_MCR); 682 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 | 683 UART_MCR_DTR | UART_MCR_RTS); 684 up->mcr = old_mcr | mcr; 685 serial_out(up, UART_MCR, up->mcr); 686 pm_runtime_mark_last_busy(up->dev); 687 pm_runtime_put_autosuspend(up->dev); 688 689 if (gpio_is_valid(up->DTR_gpio) && 690 !!(mctrl & TIOCM_DTR) != up->DTR_active) { 691 up->DTR_active = !up->DTR_active; 692 if (gpio_cansleep(up->DTR_gpio)) 693 schedule_work(&up->qos_work); 694 else 695 gpio_set_value(up->DTR_gpio, 696 up->DTR_active != up->DTR_inverted); 697 } 698 } 699 700 static void serial_omap_break_ctl(struct uart_port *port, int break_state) 701 { 702 struct uart_omap_port *up = to_uart_omap_port(port); 703 unsigned long flags = 0; 704 705 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); 706 pm_runtime_get_sync(up->dev); 707 spin_lock_irqsave(&up->port.lock, flags); 708 if (break_state == -1) 709 up->lcr |= UART_LCR_SBC; 710 else 711 up->lcr &= ~UART_LCR_SBC; 712 serial_out(up, UART_LCR, up->lcr); 713 spin_unlock_irqrestore(&up->port.lock, flags); 714 pm_runtime_mark_last_busy(up->dev); 715 pm_runtime_put_autosuspend(up->dev); 716 } 717 718 static int serial_omap_startup(struct uart_port *port) 719 { 720 struct uart_omap_port *up = to_uart_omap_port(port); 721 unsigned long flags = 0; 722 int retval; 723 724 /* 725 * Allocate the IRQ 726 */ 727 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 728 up->name, up); 729 if (retval) 730 return retval; 731 732 /* Optional wake-up IRQ */ 733 if (up->wakeirq) { 734 retval = request_irq(up->wakeirq, serial_omap_irq, 735 up->port.irqflags, up->name, up); 736 if (retval) { 737 free_irq(up->port.irq, up); 738 return retval; 739 } 740 disable_irq(up->wakeirq); 741 } 742 743 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); 744 745 pm_runtime_get_sync(up->dev); 746 /* 747 * Clear the FIFO buffers and disable them. 748 * (they will be reenabled in set_termios()) 749 */ 750 serial_omap_clear_fifos(up); 751 /* For Hardware flow control */ 752 serial_out(up, UART_MCR, UART_MCR_RTS); 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 if (up->wakeirq) 832 free_irq(up->wakeirq, up); 833 } 834 835 static void serial_omap_uart_qos_work(struct work_struct *work) 836 { 837 struct uart_omap_port *up = container_of(work, struct uart_omap_port, 838 qos_work); 839 840 pm_qos_update_request(&up->pm_qos_request, up->latency); 841 if (gpio_is_valid(up->DTR_gpio)) 842 gpio_set_value_cansleep(up->DTR_gpio, 843 up->DTR_active != up->DTR_inverted); 844 } 845 846 static void 847 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 848 struct ktermios *old) 849 { 850 struct uart_omap_port *up = to_uart_omap_port(port); 851 unsigned char cval = 0; 852 unsigned long flags = 0; 853 unsigned int baud, quot; 854 855 switch (termios->c_cflag & CSIZE) { 856 case CS5: 857 cval = UART_LCR_WLEN5; 858 break; 859 case CS6: 860 cval = UART_LCR_WLEN6; 861 break; 862 case CS7: 863 cval = UART_LCR_WLEN7; 864 break; 865 default: 866 case CS8: 867 cval = UART_LCR_WLEN8; 868 break; 869 } 870 871 if (termios->c_cflag & CSTOPB) 872 cval |= UART_LCR_STOP; 873 if (termios->c_cflag & PARENB) 874 cval |= UART_LCR_PARITY; 875 if (!(termios->c_cflag & PARODD)) 876 cval |= UART_LCR_EPAR; 877 if (termios->c_cflag & CMSPAR) 878 cval |= UART_LCR_SPAR; 879 880 /* 881 * Ask the core to calculate the divisor for us. 882 */ 883 884 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 885 quot = serial_omap_get_divisor(port, baud); 886 887 /* calculate wakeup latency constraint */ 888 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8); 889 up->latency = up->calc_latency; 890 schedule_work(&up->qos_work); 891 892 up->dll = quot & 0xff; 893 up->dlh = quot >> 8; 894 up->mdr1 = UART_OMAP_MDR1_DISABLE; 895 896 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 897 UART_FCR_ENABLE_FIFO; 898 899 /* 900 * Ok, we're now changing the port state. Do it with 901 * interrupts disabled. 902 */ 903 pm_runtime_get_sync(up->dev); 904 spin_lock_irqsave(&up->port.lock, flags); 905 906 /* 907 * Update the per-port timeout. 908 */ 909 uart_update_timeout(port, termios->c_cflag, baud); 910 911 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 912 if (termios->c_iflag & INPCK) 913 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 914 if (termios->c_iflag & (BRKINT | PARMRK)) 915 up->port.read_status_mask |= UART_LSR_BI; 916 917 /* 918 * Characters to ignore 919 */ 920 up->port.ignore_status_mask = 0; 921 if (termios->c_iflag & IGNPAR) 922 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 923 if (termios->c_iflag & IGNBRK) { 924 up->port.ignore_status_mask |= UART_LSR_BI; 925 /* 926 * If we're ignoring parity and break indicators, 927 * ignore overruns too (for real raw support). 928 */ 929 if (termios->c_iflag & IGNPAR) 930 up->port.ignore_status_mask |= UART_LSR_OE; 931 } 932 933 /* 934 * ignore all characters if CREAD is not set 935 */ 936 if ((termios->c_cflag & CREAD) == 0) 937 up->port.ignore_status_mask |= UART_LSR_DR; 938 939 /* 940 * Modem status interrupts 941 */ 942 up->ier &= ~UART_IER_MSI; 943 if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 944 up->ier |= UART_IER_MSI; 945 serial_out(up, UART_IER, up->ier); 946 serial_out(up, UART_LCR, cval); /* reset DLAB */ 947 up->lcr = cval; 948 up->scr = 0; 949 950 /* FIFOs and DMA Settings */ 951 952 /* FCR can be changed only when the 953 * baud clock is not running 954 * DLL_REG and DLH_REG set to 0. 955 */ 956 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 957 serial_out(up, UART_DLL, 0); 958 serial_out(up, UART_DLM, 0); 959 serial_out(up, UART_LCR, 0); 960 961 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 962 963 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB; 964 up->efr &= ~UART_EFR_SCD; 965 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 966 967 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 968 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR; 969 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 970 /* FIFO ENABLE, DMA MODE */ 971 972 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK; 973 /* 974 * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK 975 * sets Enables the granularity of 1 for TRIGGER RX 976 * level. Along with setting RX FIFO trigger level 977 * to 1 (as noted below, 16 characters) and TLR[3:0] 978 * to zero this will result RX FIFO threshold level 979 * to 1 character, instead of 16 as noted in comment 980 * below. 981 */ 982 983 /* Set receive FIFO threshold to 16 characters and 984 * transmit FIFO threshold to 32 spaces 985 */ 986 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK; 987 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK; 988 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 | 989 UART_FCR_ENABLE_FIFO; 990 991 serial_out(up, UART_FCR, up->fcr); 992 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 993 994 serial_out(up, UART_OMAP_SCR, up->scr); 995 996 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */ 997 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 998 serial_out(up, UART_MCR, up->mcr); 999 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1000 serial_out(up, UART_EFR, up->efr); 1001 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1002 1003 /* Protocol, Baud Rate, and Interrupt Settings */ 1004 1005 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1006 serial_omap_mdr1_errataset(up, up->mdr1); 1007 else 1008 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1009 1010 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1011 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 1012 1013 serial_out(up, UART_LCR, 0); 1014 serial_out(up, UART_IER, 0); 1015 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1016 1017 serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 1018 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 1019 1020 serial_out(up, UART_LCR, 0); 1021 serial_out(up, UART_IER, up->ier); 1022 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1023 1024 serial_out(up, UART_EFR, up->efr); 1025 serial_out(up, UART_LCR, cval); 1026 1027 if (!serial_omap_baud_is_mode16(port, baud)) 1028 up->mdr1 = UART_OMAP_MDR1_13X_MODE; 1029 else 1030 up->mdr1 = UART_OMAP_MDR1_16X_MODE; 1031 1032 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1033 serial_omap_mdr1_errataset(up, up->mdr1); 1034 else 1035 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1036 1037 /* Configure flow control */ 1038 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1039 1040 /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */ 1041 serial_out(up, UART_XON1, termios->c_cc[VSTART]); 1042 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 1043 1044 /* Enable access to TCR/TLR */ 1045 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 1046 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1047 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 1048 1049 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 1050 1051 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) { 1052 /* Enable AUTORTS and AUTOCTS */ 1053 up->efr |= UART_EFR_CTS | UART_EFR_RTS; 1054 1055 /* Ensure MCR RTS is asserted */ 1056 up->mcr |= UART_MCR_RTS; 1057 } else { 1058 /* Disable AUTORTS and AUTOCTS */ 1059 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS); 1060 } 1061 1062 if (up->port.flags & UPF_SOFT_FLOW) { 1063 /* clear SW control mode bits */ 1064 up->efr &= OMAP_UART_SW_CLR; 1065 1066 /* 1067 * IXON Flag: 1068 * Enable XON/XOFF flow control on input. 1069 * Receiver compares XON1, XOFF1. 1070 */ 1071 if (termios->c_iflag & IXON) 1072 up->efr |= OMAP_UART_SW_RX; 1073 1074 /* 1075 * IXOFF Flag: 1076 * Enable XON/XOFF flow control on output. 1077 * Transmit XON1, XOFF1 1078 */ 1079 if (termios->c_iflag & IXOFF) 1080 up->efr |= OMAP_UART_SW_TX; 1081 1082 /* 1083 * IXANY Flag: 1084 * Enable any character to restart output. 1085 * Operation resumes after receiving any 1086 * character after recognition of the XOFF character 1087 */ 1088 if (termios->c_iflag & IXANY) 1089 up->mcr |= UART_MCR_XONANY; 1090 else 1091 up->mcr &= ~UART_MCR_XONANY; 1092 } 1093 serial_out(up, UART_MCR, up->mcr); 1094 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1095 serial_out(up, UART_EFR, up->efr); 1096 serial_out(up, UART_LCR, up->lcr); 1097 1098 serial_omap_set_mctrl(&up->port, up->port.mctrl); 1099 1100 spin_unlock_irqrestore(&up->port.lock, flags); 1101 pm_runtime_mark_last_busy(up->dev); 1102 pm_runtime_put_autosuspend(up->dev); 1103 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); 1104 } 1105 1106 static void 1107 serial_omap_pm(struct uart_port *port, unsigned int state, 1108 unsigned int oldstate) 1109 { 1110 struct uart_omap_port *up = to_uart_omap_port(port); 1111 unsigned char efr; 1112 1113 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); 1114 1115 pm_runtime_get_sync(up->dev); 1116 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1117 efr = serial_in(up, UART_EFR); 1118 serial_out(up, UART_EFR, efr | UART_EFR_ECB); 1119 serial_out(up, UART_LCR, 0); 1120 1121 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 1122 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1123 serial_out(up, UART_EFR, efr); 1124 serial_out(up, UART_LCR, 0); 1125 1126 if (!device_may_wakeup(up->dev)) { 1127 if (!state) 1128 pm_runtime_forbid(up->dev); 1129 else 1130 pm_runtime_allow(up->dev); 1131 } 1132 1133 pm_runtime_mark_last_busy(up->dev); 1134 pm_runtime_put_autosuspend(up->dev); 1135 } 1136 1137 static void serial_omap_release_port(struct uart_port *port) 1138 { 1139 dev_dbg(port->dev, "serial_omap_release_port+\n"); 1140 } 1141 1142 static int serial_omap_request_port(struct uart_port *port) 1143 { 1144 dev_dbg(port->dev, "serial_omap_request_port+\n"); 1145 return 0; 1146 } 1147 1148 static void serial_omap_config_port(struct uart_port *port, int flags) 1149 { 1150 struct uart_omap_port *up = to_uart_omap_port(port); 1151 1152 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 1153 up->port.line); 1154 up->port.type = PORT_OMAP; 1155 up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW; 1156 } 1157 1158 static int 1159 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 1160 { 1161 /* we don't want the core code to modify any port params */ 1162 dev_dbg(port->dev, "serial_omap_verify_port+\n"); 1163 return -EINVAL; 1164 } 1165 1166 static const char * 1167 serial_omap_type(struct uart_port *port) 1168 { 1169 struct uart_omap_port *up = to_uart_omap_port(port); 1170 1171 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line); 1172 return up->name; 1173 } 1174 1175 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 1176 1177 static inline void wait_for_xmitr(struct uart_omap_port *up) 1178 { 1179 unsigned int status, tmout = 10000; 1180 1181 /* Wait up to 10ms for the character(s) to be sent. */ 1182 do { 1183 status = serial_in(up, UART_LSR); 1184 1185 if (status & UART_LSR_BI) 1186 up->lsr_break_flag = UART_LSR_BI; 1187 1188 if (--tmout == 0) 1189 break; 1190 udelay(1); 1191 } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 1192 1193 /* Wait up to 1s for flow control if necessary */ 1194 if (up->port.flags & UPF_CONS_FLOW) { 1195 tmout = 1000000; 1196 for (tmout = 1000000; tmout; tmout--) { 1197 unsigned int msr = serial_in(up, UART_MSR); 1198 1199 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 1200 if (msr & UART_MSR_CTS) 1201 break; 1202 1203 udelay(1); 1204 } 1205 } 1206 } 1207 1208 #ifdef CONFIG_CONSOLE_POLL 1209 1210 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 1211 { 1212 struct uart_omap_port *up = to_uart_omap_port(port); 1213 1214 pm_runtime_get_sync(up->dev); 1215 wait_for_xmitr(up); 1216 serial_out(up, UART_TX, ch); 1217 pm_runtime_mark_last_busy(up->dev); 1218 pm_runtime_put_autosuspend(up->dev); 1219 } 1220 1221 static int serial_omap_poll_get_char(struct uart_port *port) 1222 { 1223 struct uart_omap_port *up = to_uart_omap_port(port); 1224 unsigned int status; 1225 1226 pm_runtime_get_sync(up->dev); 1227 status = serial_in(up, UART_LSR); 1228 if (!(status & UART_LSR_DR)) { 1229 status = NO_POLL_CHAR; 1230 goto out; 1231 } 1232 1233 status = serial_in(up, UART_RX); 1234 1235 out: 1236 pm_runtime_mark_last_busy(up->dev); 1237 pm_runtime_put_autosuspend(up->dev); 1238 1239 return status; 1240 } 1241 1242 #endif /* CONFIG_CONSOLE_POLL */ 1243 1244 #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1245 1246 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS]; 1247 1248 static struct uart_driver serial_omap_reg; 1249 1250 static void serial_omap_console_putchar(struct uart_port *port, int ch) 1251 { 1252 struct uart_omap_port *up = to_uart_omap_port(port); 1253 1254 wait_for_xmitr(up); 1255 serial_out(up, UART_TX, ch); 1256 } 1257 1258 static void 1259 serial_omap_console_write(struct console *co, const char *s, 1260 unsigned int count) 1261 { 1262 struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1263 unsigned long flags; 1264 unsigned int ier; 1265 int locked = 1; 1266 1267 pm_runtime_get_sync(up->dev); 1268 1269 local_irq_save(flags); 1270 if (up->port.sysrq) 1271 locked = 0; 1272 else if (oops_in_progress) 1273 locked = spin_trylock(&up->port.lock); 1274 else 1275 spin_lock(&up->port.lock); 1276 1277 /* 1278 * First save the IER then disable the interrupts 1279 */ 1280 ier = serial_in(up, UART_IER); 1281 serial_out(up, UART_IER, 0); 1282 1283 uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1284 1285 /* 1286 * Finally, wait for transmitter to become empty 1287 * and restore the IER 1288 */ 1289 wait_for_xmitr(up); 1290 serial_out(up, UART_IER, ier); 1291 /* 1292 * The receive handling will happen properly because the 1293 * receive ready bit will still be set; it is not cleared 1294 * on read. However, modem control will not, we must 1295 * call it if we have saved something in the saved flags 1296 * while processing with interrupts off. 1297 */ 1298 if (up->msr_saved_flags) 1299 check_modem_status(up); 1300 1301 pm_runtime_mark_last_busy(up->dev); 1302 pm_runtime_put_autosuspend(up->dev); 1303 if (locked) 1304 spin_unlock(&up->port.lock); 1305 local_irq_restore(flags); 1306 } 1307 1308 static int __init 1309 serial_omap_console_setup(struct console *co, char *options) 1310 { 1311 struct uart_omap_port *up; 1312 int baud = 115200; 1313 int bits = 8; 1314 int parity = 'n'; 1315 int flow = 'n'; 1316 1317 if (serial_omap_console_ports[co->index] == NULL) 1318 return -ENODEV; 1319 up = serial_omap_console_ports[co->index]; 1320 1321 if (options) 1322 uart_parse_options(options, &baud, &parity, &bits, &flow); 1323 1324 return uart_set_options(&up->port, co, baud, parity, bits, flow); 1325 } 1326 1327 static struct console serial_omap_console = { 1328 .name = OMAP_SERIAL_NAME, 1329 .write = serial_omap_console_write, 1330 .device = uart_console_device, 1331 .setup = serial_omap_console_setup, 1332 .flags = CON_PRINTBUFFER, 1333 .index = -1, 1334 .data = &serial_omap_reg, 1335 }; 1336 1337 static void serial_omap_add_console_port(struct uart_omap_port *up) 1338 { 1339 serial_omap_console_ports[up->port.line] = up; 1340 } 1341 1342 #define OMAP_CONSOLE (&serial_omap_console) 1343 1344 #else 1345 1346 #define OMAP_CONSOLE NULL 1347 1348 static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1349 {} 1350 1351 #endif 1352 1353 /* Enable or disable the rs485 support */ 1354 static void 1355 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf) 1356 { 1357 struct uart_omap_port *up = to_uart_omap_port(port); 1358 unsigned long flags; 1359 unsigned int mode; 1360 int val; 1361 1362 pm_runtime_get_sync(up->dev); 1363 spin_lock_irqsave(&up->port.lock, flags); 1364 1365 /* Disable interrupts from this port */ 1366 mode = up->ier; 1367 up->ier = 0; 1368 serial_out(up, UART_IER, 0); 1369 1370 /* store new config */ 1371 up->rs485 = *rs485conf; 1372 1373 /* 1374 * Just as a precaution, only allow rs485 1375 * to be enabled if the gpio pin is valid 1376 */ 1377 if (gpio_is_valid(up->rts_gpio)) { 1378 /* enable / disable rts */ 1379 val = (up->rs485.flags & SER_RS485_ENABLED) ? 1380 SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND; 1381 val = (up->rs485.flags & val) ? 1 : 0; 1382 gpio_set_value(up->rts_gpio, val); 1383 } else 1384 up->rs485.flags &= ~SER_RS485_ENABLED; 1385 1386 /* Enable interrupts */ 1387 up->ier = mode; 1388 serial_out(up, UART_IER, up->ier); 1389 1390 /* If RS-485 is disabled, make sure the THR interrupt is fired when 1391 * TX FIFO is below the trigger level. 1392 */ 1393 if (!(up->rs485.flags & SER_RS485_ENABLED) && 1394 (up->scr & OMAP_UART_SCR_TX_EMPTY)) { 1395 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 1396 serial_out(up, UART_OMAP_SCR, up->scr); 1397 } 1398 1399 spin_unlock_irqrestore(&up->port.lock, flags); 1400 pm_runtime_mark_last_busy(up->dev); 1401 pm_runtime_put_autosuspend(up->dev); 1402 } 1403 1404 static int 1405 serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg) 1406 { 1407 struct serial_rs485 rs485conf; 1408 1409 switch (cmd) { 1410 case TIOCSRS485: 1411 if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg, 1412 sizeof(rs485conf))) 1413 return -EFAULT; 1414 1415 serial_omap_config_rs485(port, &rs485conf); 1416 break; 1417 1418 case TIOCGRS485: 1419 if (copy_to_user((struct serial_rs485 *) arg, 1420 &(to_uart_omap_port(port)->rs485), 1421 sizeof(rs485conf))) 1422 return -EFAULT; 1423 break; 1424 1425 default: 1426 return -ENOIOCTLCMD; 1427 } 1428 return 0; 1429 } 1430 1431 1432 static struct uart_ops serial_omap_pops = { 1433 .tx_empty = serial_omap_tx_empty, 1434 .set_mctrl = serial_omap_set_mctrl, 1435 .get_mctrl = serial_omap_get_mctrl, 1436 .stop_tx = serial_omap_stop_tx, 1437 .start_tx = serial_omap_start_tx, 1438 .throttle = serial_omap_throttle, 1439 .unthrottle = serial_omap_unthrottle, 1440 .stop_rx = serial_omap_stop_rx, 1441 .enable_ms = serial_omap_enable_ms, 1442 .break_ctl = serial_omap_break_ctl, 1443 .startup = serial_omap_startup, 1444 .shutdown = serial_omap_shutdown, 1445 .set_termios = serial_omap_set_termios, 1446 .pm = serial_omap_pm, 1447 .type = serial_omap_type, 1448 .release_port = serial_omap_release_port, 1449 .request_port = serial_omap_request_port, 1450 .config_port = serial_omap_config_port, 1451 .verify_port = serial_omap_verify_port, 1452 .ioctl = serial_omap_ioctl, 1453 #ifdef CONFIG_CONSOLE_POLL 1454 .poll_put_char = serial_omap_poll_put_char, 1455 .poll_get_char = serial_omap_poll_get_char, 1456 #endif 1457 }; 1458 1459 static struct uart_driver serial_omap_reg = { 1460 .owner = THIS_MODULE, 1461 .driver_name = "OMAP-SERIAL", 1462 .dev_name = OMAP_SERIAL_NAME, 1463 .nr = OMAP_MAX_HSUART_PORTS, 1464 .cons = OMAP_CONSOLE, 1465 }; 1466 1467 #ifdef CONFIG_PM_SLEEP 1468 static int serial_omap_prepare(struct device *dev) 1469 { 1470 struct uart_omap_port *up = dev_get_drvdata(dev); 1471 1472 up->is_suspending = true; 1473 1474 return 0; 1475 } 1476 1477 static void serial_omap_complete(struct device *dev) 1478 { 1479 struct uart_omap_port *up = dev_get_drvdata(dev); 1480 1481 up->is_suspending = false; 1482 } 1483 1484 static int serial_omap_suspend(struct device *dev) 1485 { 1486 struct uart_omap_port *up = dev_get_drvdata(dev); 1487 1488 uart_suspend_port(&serial_omap_reg, &up->port); 1489 flush_work(&up->qos_work); 1490 1491 return 0; 1492 } 1493 1494 static int serial_omap_resume(struct device *dev) 1495 { 1496 struct uart_omap_port *up = dev_get_drvdata(dev); 1497 1498 uart_resume_port(&serial_omap_reg, &up->port); 1499 1500 return 0; 1501 } 1502 #else 1503 #define serial_omap_prepare NULL 1504 #define serial_omap_complete NULL 1505 #endif /* CONFIG_PM_SLEEP */ 1506 1507 static void omap_serial_fill_features_erratas(struct uart_omap_port *up) 1508 { 1509 u32 mvr, scheme; 1510 u16 revision, major, minor; 1511 1512 mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift)); 1513 1514 /* Check revision register scheme */ 1515 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT; 1516 1517 switch (scheme) { 1518 case 0: /* Legacy Scheme: OMAP2/3 */ 1519 /* MINOR_REV[0:4], MAJOR_REV[4:7] */ 1520 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >> 1521 OMAP_UART_LEGACY_MVR_MAJ_SHIFT; 1522 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK); 1523 break; 1524 case 1: 1525 /* New Scheme: OMAP4+ */ 1526 /* MINOR_REV[0:5], MAJOR_REV[8:10] */ 1527 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >> 1528 OMAP_UART_MVR_MAJ_SHIFT; 1529 minor = (mvr & OMAP_UART_MVR_MIN_MASK); 1530 break; 1531 default: 1532 dev_warn(up->dev, 1533 "Unknown %s revision, defaulting to highest\n", 1534 up->name); 1535 /* highest possible revision */ 1536 major = 0xff; 1537 minor = 0xff; 1538 } 1539 1540 /* normalize revision for the driver */ 1541 revision = UART_BUILD_REVISION(major, minor); 1542 1543 switch (revision) { 1544 case OMAP_UART_REV_46: 1545 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | 1546 UART_ERRATA_i291_DMA_FORCEIDLE); 1547 break; 1548 case OMAP_UART_REV_52: 1549 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | 1550 UART_ERRATA_i291_DMA_FORCEIDLE); 1551 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP; 1552 break; 1553 case OMAP_UART_REV_63: 1554 up->errata |= UART_ERRATA_i202_MDR1_ACCESS; 1555 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP; 1556 break; 1557 default: 1558 break; 1559 } 1560 } 1561 1562 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev) 1563 { 1564 struct omap_uart_port_info *omap_up_info; 1565 1566 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL); 1567 if (!omap_up_info) 1568 return NULL; /* out of memory */ 1569 1570 of_property_read_u32(dev->of_node, "clock-frequency", 1571 &omap_up_info->uartclk); 1572 return omap_up_info; 1573 } 1574 1575 static int serial_omap_probe_rs485(struct uart_omap_port *up, 1576 struct device_node *np) 1577 { 1578 struct serial_rs485 *rs485conf = &up->rs485; 1579 u32 rs485_delay[2]; 1580 enum of_gpio_flags flags; 1581 int ret; 1582 1583 rs485conf->flags = 0; 1584 up->rts_gpio = -EINVAL; 1585 1586 if (!np) 1587 return 0; 1588 1589 if (of_property_read_bool(np, "rs485-rts-active-high")) 1590 rs485conf->flags |= SER_RS485_RTS_ON_SEND; 1591 else 1592 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 1593 1594 /* check for tx enable gpio */ 1595 up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags); 1596 if (gpio_is_valid(up->rts_gpio)) { 1597 ret = gpio_request(up->rts_gpio, "omap-serial"); 1598 if (ret < 0) 1599 return ret; 1600 ret = gpio_direction_output(up->rts_gpio, 1601 flags & SER_RS485_RTS_AFTER_SEND); 1602 if (ret < 0) 1603 return ret; 1604 } else if (up->rts_gpio == -EPROBE_DEFER) { 1605 return -EPROBE_DEFER; 1606 } else { 1607 up->rts_gpio = -EINVAL; 1608 } 1609 1610 if (of_property_read_u32_array(np, "rs485-rts-delay", 1611 rs485_delay, 2) == 0) { 1612 rs485conf->delay_rts_before_send = rs485_delay[0]; 1613 rs485conf->delay_rts_after_send = rs485_delay[1]; 1614 } 1615 1616 if (of_property_read_bool(np, "rs485-rx-during-tx")) 1617 rs485conf->flags |= SER_RS485_RX_DURING_TX; 1618 1619 if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time")) 1620 rs485conf->flags |= SER_RS485_ENABLED; 1621 1622 return 0; 1623 } 1624 1625 static int serial_omap_probe(struct platform_device *pdev) 1626 { 1627 struct uart_omap_port *up; 1628 struct resource *mem, *irq; 1629 struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev); 1630 int ret, uartirq = 0, wakeirq = 0; 1631 1632 /* The optional wakeirq may be specified in the board dts file */ 1633 if (pdev->dev.of_node) { 1634 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0); 1635 if (!uartirq) 1636 return -EPROBE_DEFER; 1637 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1); 1638 omap_up_info = of_get_uart_port_info(&pdev->dev); 1639 pdev->dev.platform_data = omap_up_info; 1640 } else { 1641 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 1642 if (!irq) { 1643 dev_err(&pdev->dev, "no irq resource?\n"); 1644 return -ENODEV; 1645 } 1646 uartirq = irq->start; 1647 } 1648 1649 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1650 if (!mem) { 1651 dev_err(&pdev->dev, "no mem resource?\n"); 1652 return -ENODEV; 1653 } 1654 1655 if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem), 1656 pdev->dev.driver->name)) { 1657 dev_err(&pdev->dev, "memory region already claimed\n"); 1658 return -EBUSY; 1659 } 1660 1661 if (gpio_is_valid(omap_up_info->DTR_gpio) && 1662 omap_up_info->DTR_present) { 1663 ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial"); 1664 if (ret < 0) 1665 return ret; 1666 ret = gpio_direction_output(omap_up_info->DTR_gpio, 1667 omap_up_info->DTR_inverted); 1668 if (ret < 0) 1669 return ret; 1670 } 1671 1672 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL); 1673 if (!up) 1674 return -ENOMEM; 1675 1676 if (gpio_is_valid(omap_up_info->DTR_gpio) && 1677 omap_up_info->DTR_present) { 1678 up->DTR_gpio = omap_up_info->DTR_gpio; 1679 up->DTR_inverted = omap_up_info->DTR_inverted; 1680 } else 1681 up->DTR_gpio = -EINVAL; 1682 up->DTR_active = 0; 1683 1684 up->dev = &pdev->dev; 1685 up->port.dev = &pdev->dev; 1686 up->port.type = PORT_OMAP; 1687 up->port.iotype = UPIO_MEM; 1688 up->port.irq = uartirq; 1689 up->wakeirq = wakeirq; 1690 if (!up->wakeirq) 1691 dev_info(up->port.dev, "no wakeirq for uart%d\n", 1692 up->port.line); 1693 1694 up->port.regshift = 2; 1695 up->port.fifosize = 64; 1696 up->port.ops = &serial_omap_pops; 1697 1698 if (pdev->dev.of_node) 1699 up->port.line = of_alias_get_id(pdev->dev.of_node, "serial"); 1700 else 1701 up->port.line = pdev->id; 1702 1703 if (up->port.line < 0) { 1704 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", 1705 up->port.line); 1706 ret = -ENODEV; 1707 goto err_port_line; 1708 } 1709 1710 ret = serial_omap_probe_rs485(up, pdev->dev.of_node); 1711 if (ret < 0) 1712 goto err_rs485; 1713 1714 sprintf(up->name, "OMAP UART%d", up->port.line); 1715 up->port.mapbase = mem->start; 1716 up->port.membase = devm_ioremap(&pdev->dev, mem->start, 1717 resource_size(mem)); 1718 if (!up->port.membase) { 1719 dev_err(&pdev->dev, "can't ioremap UART\n"); 1720 ret = -ENOMEM; 1721 goto err_ioremap; 1722 } 1723 1724 up->port.flags = omap_up_info->flags; 1725 up->port.uartclk = omap_up_info->uartclk; 1726 if (!up->port.uartclk) { 1727 up->port.uartclk = DEFAULT_CLK_SPEED; 1728 dev_warn(&pdev->dev, 1729 "No clock speed specified: using default: %d\n", 1730 DEFAULT_CLK_SPEED); 1731 } 1732 1733 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1734 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1735 pm_qos_add_request(&up->pm_qos_request, 1736 PM_QOS_CPU_DMA_LATENCY, up->latency); 1737 serial_omap_uart_wq = create_singlethread_workqueue(up->name); 1738 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); 1739 1740 platform_set_drvdata(pdev, up); 1741 if (omap_up_info->autosuspend_timeout == 0) 1742 omap_up_info->autosuspend_timeout = -1; 1743 device_init_wakeup(up->dev, true); 1744 pm_runtime_use_autosuspend(&pdev->dev); 1745 pm_runtime_set_autosuspend_delay(&pdev->dev, 1746 omap_up_info->autosuspend_timeout); 1747 1748 pm_runtime_irq_safe(&pdev->dev); 1749 pm_runtime_enable(&pdev->dev); 1750 1751 pm_runtime_get_sync(&pdev->dev); 1752 1753 omap_serial_fill_features_erratas(up); 1754 1755 ui[up->port.line] = up; 1756 serial_omap_add_console_port(up); 1757 1758 ret = uart_add_one_port(&serial_omap_reg, &up->port); 1759 if (ret != 0) 1760 goto err_add_port; 1761 1762 pm_runtime_mark_last_busy(up->dev); 1763 pm_runtime_put_autosuspend(up->dev); 1764 return 0; 1765 1766 err_add_port: 1767 pm_runtime_put(&pdev->dev); 1768 pm_runtime_disable(&pdev->dev); 1769 err_ioremap: 1770 err_rs485: 1771 err_port_line: 1772 dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", 1773 pdev->id, __func__, ret); 1774 return ret; 1775 } 1776 1777 static int serial_omap_remove(struct platform_device *dev) 1778 { 1779 struct uart_omap_port *up = platform_get_drvdata(dev); 1780 1781 pm_runtime_put_sync(up->dev); 1782 pm_runtime_disable(up->dev); 1783 uart_remove_one_port(&serial_omap_reg, &up->port); 1784 pm_qos_remove_request(&up->pm_qos_request); 1785 1786 return 0; 1787 } 1788 1789 /* 1790 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 1791 * The access to uart register after MDR1 Access 1792 * causes UART to corrupt data. 1793 * 1794 * Need a delay = 1795 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 1796 * give 10 times as much 1797 */ 1798 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 1799 { 1800 u8 timeout = 255; 1801 1802 serial_out(up, UART_OMAP_MDR1, mdr1); 1803 udelay(2); 1804 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 1805 UART_FCR_CLEAR_RCVR); 1806 /* 1807 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 1808 * TX_FIFO_E bit is 1. 1809 */ 1810 while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 1811 (UART_LSR_THRE | UART_LSR_DR))) { 1812 timeout--; 1813 if (!timeout) { 1814 /* Should *never* happen. we warn and carry on */ 1815 dev_crit(up->dev, "Errata i202: timedout %x\n", 1816 serial_in(up, UART_LSR)); 1817 break; 1818 } 1819 udelay(1); 1820 } 1821 } 1822 1823 #ifdef CONFIG_PM_RUNTIME 1824 static void serial_omap_restore_context(struct uart_omap_port *up) 1825 { 1826 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1827 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 1828 else 1829 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 1830 1831 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1832 serial_out(up, UART_EFR, UART_EFR_ECB); 1833 serial_out(up, UART_LCR, 0x0); /* Operational mode */ 1834 serial_out(up, UART_IER, 0x0); 1835 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1836 serial_out(up, UART_DLL, up->dll); 1837 serial_out(up, UART_DLM, up->dlh); 1838 serial_out(up, UART_LCR, 0x0); /* Operational mode */ 1839 serial_out(up, UART_IER, up->ier); 1840 serial_out(up, UART_FCR, up->fcr); 1841 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1842 serial_out(up, UART_MCR, up->mcr); 1843 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1844 serial_out(up, UART_OMAP_SCR, up->scr); 1845 serial_out(up, UART_EFR, up->efr); 1846 serial_out(up, UART_LCR, up->lcr); 1847 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1848 serial_omap_mdr1_errataset(up, up->mdr1); 1849 else 1850 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1851 serial_out(up, UART_OMAP_WER, up->wer); 1852 } 1853 1854 static int serial_omap_runtime_suspend(struct device *dev) 1855 { 1856 struct uart_omap_port *up = dev_get_drvdata(dev); 1857 1858 if (!up) 1859 return -EINVAL; 1860 1861 /* 1862 * When using 'no_console_suspend', the console UART must not be 1863 * suspended. Since driver suspend is managed by runtime suspend, 1864 * preventing runtime suspend (by returning error) will keep device 1865 * active during suspend. 1866 */ 1867 if (up->is_suspending && !console_suspend_enabled && 1868 uart_console(&up->port)) 1869 return -EBUSY; 1870 1871 up->context_loss_cnt = serial_omap_get_context_loss_count(up); 1872 1873 if (device_may_wakeup(dev)) { 1874 if (!up->wakeups_enabled) { 1875 serial_omap_enable_wakeup(up, true); 1876 up->wakeups_enabled = true; 1877 } 1878 } else { 1879 if (up->wakeups_enabled) { 1880 serial_omap_enable_wakeup(up, false); 1881 up->wakeups_enabled = false; 1882 } 1883 } 1884 1885 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1886 schedule_work(&up->qos_work); 1887 1888 return 0; 1889 } 1890 1891 static int serial_omap_runtime_resume(struct device *dev) 1892 { 1893 struct uart_omap_port *up = dev_get_drvdata(dev); 1894 1895 int loss_cnt = serial_omap_get_context_loss_count(up); 1896 1897 if (loss_cnt < 0) { 1898 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n", 1899 loss_cnt); 1900 serial_omap_restore_context(up); 1901 } else if (up->context_loss_cnt != loss_cnt) { 1902 serial_omap_restore_context(up); 1903 } 1904 up->latency = up->calc_latency; 1905 schedule_work(&up->qos_work); 1906 1907 return 0; 1908 } 1909 #endif 1910 1911 static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1912 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1913 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1914 serial_omap_runtime_resume, NULL) 1915 .prepare = serial_omap_prepare, 1916 .complete = serial_omap_complete, 1917 }; 1918 1919 #if defined(CONFIG_OF) 1920 static const struct of_device_id omap_serial_of_match[] = { 1921 { .compatible = "ti,omap2-uart" }, 1922 { .compatible = "ti,omap3-uart" }, 1923 { .compatible = "ti,omap4-uart" }, 1924 {}, 1925 }; 1926 MODULE_DEVICE_TABLE(of, omap_serial_of_match); 1927 #endif 1928 1929 static struct platform_driver serial_omap_driver = { 1930 .probe = serial_omap_probe, 1931 .remove = serial_omap_remove, 1932 .driver = { 1933 .name = DRIVER_NAME, 1934 .pm = &serial_omap_dev_pm_ops, 1935 .of_match_table = of_match_ptr(omap_serial_of_match), 1936 }, 1937 }; 1938 1939 static int __init serial_omap_init(void) 1940 { 1941 int ret; 1942 1943 ret = uart_register_driver(&serial_omap_reg); 1944 if (ret != 0) 1945 return ret; 1946 ret = platform_driver_register(&serial_omap_driver); 1947 if (ret != 0) 1948 uart_unregister_driver(&serial_omap_reg); 1949 return ret; 1950 } 1951 1952 static void __exit serial_omap_exit(void) 1953 { 1954 platform_driver_unregister(&serial_omap_driver); 1955 uart_unregister_driver(&serial_omap_reg); 1956 } 1957 1958 module_init(serial_omap_init); 1959 module_exit(serial_omap_exit); 1960 1961 MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1962 MODULE_LICENSE("GPL"); 1963 MODULE_AUTHOR("Texas Instruments Inc"); 1964