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.h> 37 #include <linux/of_gpio.h> 38 #include <linux/platform_data/serial-omap.h> 39 40 #include <dt-bindings/gpio/gpio.h> 41 42 #define OMAP_MAX_HSUART_PORTS 10 43 44 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y)) 45 46 #define OMAP_UART_REV_42 0x0402 47 #define OMAP_UART_REV_46 0x0406 48 #define OMAP_UART_REV_52 0x0502 49 #define OMAP_UART_REV_63 0x0603 50 51 #define OMAP_UART_TX_WAKEUP_EN BIT(7) 52 53 /* Feature flags */ 54 #define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0) 55 56 #define UART_ERRATA_i202_MDR1_ACCESS BIT(0) 57 #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1) 58 59 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz */ 60 61 /* SCR register bitmasks */ 62 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) 63 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6) 64 #define OMAP_UART_SCR_TX_EMPTY (1 << 3) 65 66 /* FCR register bitmasks */ 67 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6) 68 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4) 69 70 /* MVR register bitmasks */ 71 #define OMAP_UART_MVR_SCHEME_SHIFT 30 72 73 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0 74 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4 75 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f 76 77 #define OMAP_UART_MVR_MAJ_MASK 0x700 78 #define OMAP_UART_MVR_MAJ_SHIFT 8 79 #define OMAP_UART_MVR_MIN_MASK 0x3f 80 81 #define OMAP_UART_DMA_CH_FREE -1 82 83 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA 84 #define OMAP_MODE13X_SPEED 230400 85 86 /* WER = 0x7F 87 * Enable module level wakeup in WER reg 88 */ 89 #define OMAP_UART_WER_MOD_WKUP 0x7F 90 91 /* Enable XON/XOFF flow control on output */ 92 #define OMAP_UART_SW_TX 0x08 93 94 /* Enable XON/XOFF flow control on input */ 95 #define OMAP_UART_SW_RX 0x02 96 97 #define OMAP_UART_SW_CLR 0xF0 98 99 #define OMAP_UART_TCR_TRIG 0x0F 100 101 struct uart_omap_dma { 102 u8 uart_dma_tx; 103 u8 uart_dma_rx; 104 int rx_dma_channel; 105 int tx_dma_channel; 106 dma_addr_t rx_buf_dma_phys; 107 dma_addr_t tx_buf_dma_phys; 108 unsigned int uart_base; 109 /* 110 * Buffer for rx dma. It is not required for tx because the buffer 111 * comes from port structure. 112 */ 113 unsigned char *rx_buf; 114 unsigned int prev_rx_dma_pos; 115 int tx_buf_size; 116 int tx_dma_used; 117 int rx_dma_used; 118 spinlock_t tx_lock; 119 spinlock_t rx_lock; 120 /* timer to poll activity on rx dma */ 121 struct timer_list rx_timer; 122 unsigned int rx_buf_size; 123 unsigned int rx_poll_rate; 124 unsigned int rx_timeout; 125 }; 126 127 struct uart_omap_port { 128 struct uart_port port; 129 struct uart_omap_dma uart_dma; 130 struct device *dev; 131 int wakeirq; 132 133 unsigned char ier; 134 unsigned char lcr; 135 unsigned char mcr; 136 unsigned char fcr; 137 unsigned char efr; 138 unsigned char dll; 139 unsigned char dlh; 140 unsigned char mdr1; 141 unsigned char scr; 142 unsigned char wer; 143 144 int use_dma; 145 /* 146 * Some bits in registers are cleared on a read, so they must 147 * be saved whenever the register is read, but the bits will not 148 * be immediately processed. 149 */ 150 unsigned int lsr_break_flag; 151 unsigned char msr_saved_flags; 152 char name[20]; 153 unsigned long port_activity; 154 int context_loss_cnt; 155 u32 errata; 156 u32 features; 157 158 int rts_gpio; 159 160 struct pm_qos_request pm_qos_request; 161 u32 latency; 162 u32 calc_latency; 163 struct work_struct qos_work; 164 bool is_suspending; 165 }; 166 167 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port))) 168 169 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 170 171 /* Forward declaration of functions */ 172 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 173 174 static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 175 { 176 offset <<= up->port.regshift; 177 return readw(up->port.membase + offset); 178 } 179 180 static inline void serial_out(struct uart_omap_port *up, int offset, int value) 181 { 182 offset <<= up->port.regshift; 183 writew(value, up->port.membase + offset); 184 } 185 186 static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 187 { 188 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 189 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 190 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 191 serial_out(up, UART_FCR, 0); 192 } 193 194 #ifdef CONFIG_PM 195 static int serial_omap_get_context_loss_count(struct uart_omap_port *up) 196 { 197 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev); 198 199 if (!pdata || !pdata->get_context_loss_count) 200 return -EINVAL; 201 202 return pdata->get_context_loss_count(up->dev); 203 } 204 205 /* REVISIT: Remove this when omap3 boots in device tree only mode */ 206 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable) 207 { 208 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev); 209 210 if (!pdata || !pdata->enable_wakeup) 211 return; 212 213 pdata->enable_wakeup(up->dev, enable); 214 } 215 #endif /* CONFIG_PM */ 216 217 /* 218 * Calculate the absolute difference between the desired and actual baud 219 * rate for the given mode. 220 */ 221 static inline int calculate_baud_abs_diff(struct uart_port *port, 222 unsigned int baud, unsigned int mode) 223 { 224 unsigned int n = port->uartclk / (mode * baud); 225 int abs_diff; 226 227 if (n == 0) 228 n = 1; 229 230 abs_diff = baud - (port->uartclk / (mode * n)); 231 if (abs_diff < 0) 232 abs_diff = -abs_diff; 233 234 return abs_diff; 235 } 236 237 /* 238 * serial_omap_baud_is_mode16 - check if baud rate is MODE16X 239 * @port: uart port info 240 * @baud: baudrate for which mode needs to be determined 241 * 242 * Returns true if baud rate is MODE16X and false if MODE13X 243 * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values, 244 * and Error Rates" determines modes not for all common baud rates. 245 * E.g. for 1000000 baud rate mode must be 16x, but according to that 246 * table it's determined as 13x. 247 */ 248 static bool 249 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud) 250 { 251 int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13); 252 int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16); 253 254 return (abs_diff_13 >= abs_diff_16); 255 } 256 257 /* 258 * serial_omap_get_divisor - calculate divisor value 259 * @port: uart port info 260 * @baud: baudrate for which divisor needs to be calculated. 261 */ 262 static unsigned int 263 serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 264 { 265 unsigned int mode; 266 267 if (!serial_omap_baud_is_mode16(port, baud)) 268 mode = 13; 269 else 270 mode = 16; 271 return port->uartclk/(mode * baud); 272 } 273 274 static void serial_omap_enable_ms(struct uart_port *port) 275 { 276 struct uart_omap_port *up = to_uart_omap_port(port); 277 278 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); 279 280 pm_runtime_get_sync(up->dev); 281 up->ier |= UART_IER_MSI; 282 serial_out(up, UART_IER, up->ier); 283 pm_runtime_mark_last_busy(up->dev); 284 pm_runtime_put_autosuspend(up->dev); 285 } 286 287 static void serial_omap_stop_tx(struct uart_port *port) 288 { 289 struct uart_omap_port *up = to_uart_omap_port(port); 290 int res; 291 292 pm_runtime_get_sync(up->dev); 293 294 /* Handle RS-485 */ 295 if (port->rs485.flags & SER_RS485_ENABLED) { 296 if (up->scr & OMAP_UART_SCR_TX_EMPTY) { 297 /* THR interrupt is fired when both TX FIFO and TX 298 * shift register are empty. This means there's nothing 299 * left to transmit now, so make sure the THR interrupt 300 * is fired when TX FIFO is below the trigger level, 301 * disable THR interrupts and toggle the RS-485 GPIO 302 * data direction pin if needed. 303 */ 304 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 305 serial_out(up, UART_OMAP_SCR, up->scr); 306 res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 307 1 : 0; 308 if (gpio_get_value(up->rts_gpio) != res) { 309 if (port->rs485.delay_rts_after_send > 0) 310 mdelay( 311 port->rs485.delay_rts_after_send); 312 gpio_set_value(up->rts_gpio, 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 if ((port->rs485.flags & SER_RS485_ENABLED) && 335 !(port->rs485.flags & SER_RS485_RX_DURING_TX)) { 336 /* 337 * Empty the RX FIFO, we are not interested in anything 338 * received during the half-duplex transmission. 339 */ 340 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_RCVR); 341 /* Re-enable RX interrupts */ 342 up->ier |= UART_IER_RLSI | UART_IER_RDI; 343 up->port.read_status_mask |= UART_LSR_DR; 344 serial_out(up, UART_IER, up->ier); 345 } 346 347 pm_runtime_mark_last_busy(up->dev); 348 pm_runtime_put_autosuspend(up->dev); 349 } 350 351 static void serial_omap_stop_rx(struct uart_port *port) 352 { 353 struct uart_omap_port *up = to_uart_omap_port(port); 354 355 pm_runtime_get_sync(up->dev); 356 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); 357 up->port.read_status_mask &= ~UART_LSR_DR; 358 serial_out(up, UART_IER, up->ier); 359 pm_runtime_mark_last_busy(up->dev); 360 pm_runtime_put_autosuspend(up->dev); 361 } 362 363 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr) 364 { 365 struct circ_buf *xmit = &up->port.state->xmit; 366 int count; 367 368 if (up->port.x_char) { 369 serial_out(up, UART_TX, up->port.x_char); 370 up->port.icount.tx++; 371 up->port.x_char = 0; 372 return; 373 } 374 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 375 serial_omap_stop_tx(&up->port); 376 return; 377 } 378 count = up->port.fifosize / 4; 379 do { 380 serial_out(up, UART_TX, xmit->buf[xmit->tail]); 381 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 382 up->port.icount.tx++; 383 if (uart_circ_empty(xmit)) 384 break; 385 } while (--count > 0); 386 387 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 388 uart_write_wakeup(&up->port); 389 390 if (uart_circ_empty(xmit)) 391 serial_omap_stop_tx(&up->port); 392 } 393 394 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 395 { 396 if (!(up->ier & UART_IER_THRI)) { 397 up->ier |= UART_IER_THRI; 398 serial_out(up, UART_IER, up->ier); 399 } 400 } 401 402 static void serial_omap_start_tx(struct uart_port *port) 403 { 404 struct uart_omap_port *up = to_uart_omap_port(port); 405 int res; 406 407 pm_runtime_get_sync(up->dev); 408 409 /* Handle RS-485 */ 410 if (port->rs485.flags & SER_RS485_ENABLED) { 411 /* Fire THR interrupts when FIFO is below trigger level */ 412 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 413 serial_out(up, UART_OMAP_SCR, up->scr); 414 415 /* if rts not already enabled */ 416 res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0; 417 if (gpio_get_value(up->rts_gpio) != res) { 418 gpio_set_value(up->rts_gpio, res); 419 if (port->rs485.delay_rts_before_send > 0) 420 mdelay(port->rs485.delay_rts_before_send); 421 } 422 } 423 424 if ((port->rs485.flags & SER_RS485_ENABLED) && 425 !(port->rs485.flags & SER_RS485_RX_DURING_TX)) 426 serial_omap_stop_rx(port); 427 428 serial_omap_enable_ier_thri(up); 429 pm_runtime_mark_last_busy(up->dev); 430 pm_runtime_put_autosuspend(up->dev); 431 } 432 433 static void serial_omap_throttle(struct uart_port *port) 434 { 435 struct uart_omap_port *up = to_uart_omap_port(port); 436 unsigned long flags; 437 438 pm_runtime_get_sync(up->dev); 439 spin_lock_irqsave(&up->port.lock, flags); 440 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); 441 serial_out(up, UART_IER, up->ier); 442 spin_unlock_irqrestore(&up->port.lock, flags); 443 pm_runtime_mark_last_busy(up->dev); 444 pm_runtime_put_autosuspend(up->dev); 445 } 446 447 static void serial_omap_unthrottle(struct uart_port *port) 448 { 449 struct uart_omap_port *up = to_uart_omap_port(port); 450 unsigned long flags; 451 452 pm_runtime_get_sync(up->dev); 453 spin_lock_irqsave(&up->port.lock, flags); 454 up->ier |= UART_IER_RLSI | UART_IER_RDI; 455 serial_out(up, UART_IER, up->ier); 456 spin_unlock_irqrestore(&up->port.lock, flags); 457 pm_runtime_mark_last_busy(up->dev); 458 pm_runtime_put_autosuspend(up->dev); 459 } 460 461 static unsigned int check_modem_status(struct uart_omap_port *up) 462 { 463 unsigned int status; 464 465 status = serial_in(up, UART_MSR); 466 status |= up->msr_saved_flags; 467 up->msr_saved_flags = 0; 468 if ((status & UART_MSR_ANY_DELTA) == 0) 469 return status; 470 471 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 472 up->port.state != NULL) { 473 if (status & UART_MSR_TERI) 474 up->port.icount.rng++; 475 if (status & UART_MSR_DDSR) 476 up->port.icount.dsr++; 477 if (status & UART_MSR_DDCD) 478 uart_handle_dcd_change 479 (&up->port, status & UART_MSR_DCD); 480 if (status & UART_MSR_DCTS) 481 uart_handle_cts_change 482 (&up->port, status & UART_MSR_CTS); 483 wake_up_interruptible(&up->port.state->port.delta_msr_wait); 484 } 485 486 return status; 487 } 488 489 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr) 490 { 491 unsigned int flag; 492 493 /* 494 * Read one data character out to avoid stalling the receiver according 495 * to the table 23-246 of the omap4 TRM. 496 */ 497 if (likely(lsr & UART_LSR_DR)) 498 serial_in(up, UART_RX); 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 flag = TTY_NORMAL; 550 up->port.icount.rx++; 551 552 if (uart_handle_sysrq_char(&up->port, ch)) 553 return; 554 555 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 556 } 557 558 /** 559 * serial_omap_irq() - This handles the interrupt from one port 560 * @irq: uart port irq number 561 * @dev_id: uart port info 562 */ 563 static irqreturn_t serial_omap_irq(int irq, void *dev_id) 564 { 565 struct uart_omap_port *up = dev_id; 566 unsigned int iir, lsr; 567 unsigned int type; 568 irqreturn_t ret = IRQ_NONE; 569 int max_count = 256; 570 571 spin_lock(&up->port.lock); 572 pm_runtime_get_sync(up->dev); 573 574 do { 575 iir = serial_in(up, UART_IIR); 576 if (iir & UART_IIR_NO_INT) 577 break; 578 579 ret = IRQ_HANDLED; 580 lsr = serial_in(up, UART_LSR); 581 582 /* extract IRQ type from IIR register */ 583 type = iir & 0x3e; 584 585 switch (type) { 586 case UART_IIR_MSI: 587 check_modem_status(up); 588 break; 589 case UART_IIR_THRI: 590 transmit_chars(up, lsr); 591 break; 592 case UART_IIR_RX_TIMEOUT: 593 /* FALLTHROUGH */ 594 case UART_IIR_RDI: 595 serial_omap_rdi(up, lsr); 596 break; 597 case UART_IIR_RLSI: 598 serial_omap_rlsi(up, lsr); 599 break; 600 case UART_IIR_CTS_RTS_DSR: 601 /* simply try again */ 602 break; 603 case UART_IIR_XOFF: 604 /* FALLTHROUGH */ 605 default: 606 break; 607 } 608 } while (max_count--); 609 610 spin_unlock(&up->port.lock); 611 612 tty_flip_buffer_push(&up->port.state->port); 613 614 pm_runtime_mark_last_busy(up->dev); 615 pm_runtime_put_autosuspend(up->dev); 616 up->port_activity = jiffies; 617 618 return ret; 619 } 620 621 static unsigned int serial_omap_tx_empty(struct uart_port *port) 622 { 623 struct uart_omap_port *up = to_uart_omap_port(port); 624 unsigned long flags = 0; 625 unsigned int ret = 0; 626 627 pm_runtime_get_sync(up->dev); 628 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); 629 spin_lock_irqsave(&up->port.lock, flags); 630 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 631 spin_unlock_irqrestore(&up->port.lock, flags); 632 pm_runtime_mark_last_busy(up->dev); 633 pm_runtime_put_autosuspend(up->dev); 634 return ret; 635 } 636 637 static unsigned int serial_omap_get_mctrl(struct uart_port *port) 638 { 639 struct uart_omap_port *up = to_uart_omap_port(port); 640 unsigned int status; 641 unsigned int ret = 0; 642 643 pm_runtime_get_sync(up->dev); 644 status = check_modem_status(up); 645 pm_runtime_mark_last_busy(up->dev); 646 pm_runtime_put_autosuspend(up->dev); 647 648 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); 649 650 if (status & UART_MSR_DCD) 651 ret |= TIOCM_CAR; 652 if (status & UART_MSR_RI) 653 ret |= TIOCM_RNG; 654 if (status & UART_MSR_DSR) 655 ret |= TIOCM_DSR; 656 if (status & UART_MSR_CTS) 657 ret |= TIOCM_CTS; 658 return ret; 659 } 660 661 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 662 { 663 struct uart_omap_port *up = to_uart_omap_port(port); 664 unsigned char mcr = 0, old_mcr, lcr; 665 666 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); 667 if (mctrl & TIOCM_RTS) 668 mcr |= UART_MCR_RTS; 669 if (mctrl & TIOCM_DTR) 670 mcr |= UART_MCR_DTR; 671 if (mctrl & TIOCM_OUT1) 672 mcr |= UART_MCR_OUT1; 673 if (mctrl & TIOCM_OUT2) 674 mcr |= UART_MCR_OUT2; 675 if (mctrl & TIOCM_LOOP) 676 mcr |= UART_MCR_LOOP; 677 678 pm_runtime_get_sync(up->dev); 679 old_mcr = serial_in(up, UART_MCR); 680 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 | 681 UART_MCR_DTR | UART_MCR_RTS); 682 up->mcr = old_mcr | mcr; 683 serial_out(up, UART_MCR, up->mcr); 684 685 /* Turn off autoRTS if RTS is lowered; restore autoRTS if RTS raised */ 686 lcr = serial_in(up, UART_LCR); 687 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 688 if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS)) 689 up->efr |= UART_EFR_RTS; 690 else 691 up->efr &= ~UART_EFR_RTS; 692 serial_out(up, UART_EFR, up->efr); 693 serial_out(up, UART_LCR, lcr); 694 695 pm_runtime_mark_last_busy(up->dev); 696 pm_runtime_put_autosuspend(up->dev); 697 } 698 699 static void serial_omap_break_ctl(struct uart_port *port, int break_state) 700 { 701 struct uart_omap_port *up = to_uart_omap_port(port); 702 unsigned long flags = 0; 703 704 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); 705 pm_runtime_get_sync(up->dev); 706 spin_lock_irqsave(&up->port.lock, flags); 707 if (break_state == -1) 708 up->lcr |= UART_LCR_SBC; 709 else 710 up->lcr &= ~UART_LCR_SBC; 711 serial_out(up, UART_LCR, up->lcr); 712 spin_unlock_irqrestore(&up->port.lock, flags); 713 pm_runtime_mark_last_busy(up->dev); 714 pm_runtime_put_autosuspend(up->dev); 715 } 716 717 static int serial_omap_startup(struct uart_port *port) 718 { 719 struct uart_omap_port *up = to_uart_omap_port(port); 720 unsigned long flags = 0; 721 int retval; 722 723 /* 724 * Allocate the IRQ 725 */ 726 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 727 up->name, up); 728 if (retval) 729 return retval; 730 731 /* Optional wake-up IRQ */ 732 if (up->wakeirq) { 733 retval = dev_pm_set_dedicated_wake_irq(up->dev, up->wakeirq); 734 if (retval) { 735 free_irq(up->port.irq, up); 736 return retval; 737 } 738 } 739 740 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); 741 742 pm_runtime_get_sync(up->dev); 743 /* 744 * Clear the FIFO buffers and disable them. 745 * (they will be reenabled in set_termios()) 746 */ 747 serial_omap_clear_fifos(up); 748 749 /* 750 * Clear the interrupt registers. 751 */ 752 (void) serial_in(up, UART_LSR); 753 if (serial_in(up, UART_LSR) & UART_LSR_DR) 754 (void) serial_in(up, UART_RX); 755 (void) serial_in(up, UART_IIR); 756 (void) serial_in(up, UART_MSR); 757 758 /* 759 * Now, initialize the UART 760 */ 761 serial_out(up, UART_LCR, UART_LCR_WLEN8); 762 spin_lock_irqsave(&up->port.lock, flags); 763 /* 764 * Most PC uarts need OUT2 raised to enable interrupts. 765 */ 766 up->port.mctrl |= TIOCM_OUT2; 767 serial_omap_set_mctrl(&up->port, up->port.mctrl); 768 spin_unlock_irqrestore(&up->port.lock, flags); 769 770 up->msr_saved_flags = 0; 771 /* 772 * Finally, enable interrupts. Note: Modem status interrupts 773 * are set via set_termios(), which will be occurring imminently 774 * anyway, so we don't enable them here. 775 */ 776 up->ier = UART_IER_RLSI | UART_IER_RDI; 777 serial_out(up, UART_IER, up->ier); 778 779 /* Enable module level wake up */ 780 up->wer = OMAP_UART_WER_MOD_WKUP; 781 if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP) 782 up->wer |= OMAP_UART_TX_WAKEUP_EN; 783 784 serial_out(up, UART_OMAP_WER, up->wer); 785 786 pm_runtime_mark_last_busy(up->dev); 787 pm_runtime_put_autosuspend(up->dev); 788 up->port_activity = jiffies; 789 return 0; 790 } 791 792 static void serial_omap_shutdown(struct uart_port *port) 793 { 794 struct uart_omap_port *up = to_uart_omap_port(port); 795 unsigned long flags = 0; 796 797 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line); 798 799 pm_runtime_get_sync(up->dev); 800 /* 801 * Disable interrupts from this port 802 */ 803 up->ier = 0; 804 serial_out(up, UART_IER, 0); 805 806 spin_lock_irqsave(&up->port.lock, flags); 807 up->port.mctrl &= ~TIOCM_OUT2; 808 serial_omap_set_mctrl(&up->port, up->port.mctrl); 809 spin_unlock_irqrestore(&up->port.lock, flags); 810 811 /* 812 * Disable break condition and FIFOs 813 */ 814 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 815 serial_omap_clear_fifos(up); 816 817 /* 818 * Read data port to reset things, and then free the irq 819 */ 820 if (serial_in(up, UART_LSR) & UART_LSR_DR) 821 (void) serial_in(up, UART_RX); 822 823 pm_runtime_mark_last_busy(up->dev); 824 pm_runtime_put_autosuspend(up->dev); 825 free_irq(up->port.irq, up); 826 dev_pm_clear_wake_irq(up->dev); 827 } 828 829 static void serial_omap_uart_qos_work(struct work_struct *work) 830 { 831 struct uart_omap_port *up = container_of(work, struct uart_omap_port, 832 qos_work); 833 834 pm_qos_update_request(&up->pm_qos_request, up->latency); 835 } 836 837 static void 838 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 839 struct ktermios *old) 840 { 841 struct uart_omap_port *up = to_uart_omap_port(port); 842 unsigned char cval = 0; 843 unsigned long flags = 0; 844 unsigned int baud, quot; 845 846 switch (termios->c_cflag & CSIZE) { 847 case CS5: 848 cval = UART_LCR_WLEN5; 849 break; 850 case CS6: 851 cval = UART_LCR_WLEN6; 852 break; 853 case CS7: 854 cval = UART_LCR_WLEN7; 855 break; 856 default: 857 case CS8: 858 cval = UART_LCR_WLEN8; 859 break; 860 } 861 862 if (termios->c_cflag & CSTOPB) 863 cval |= UART_LCR_STOP; 864 if (termios->c_cflag & PARENB) 865 cval |= UART_LCR_PARITY; 866 if (!(termios->c_cflag & PARODD)) 867 cval |= UART_LCR_EPAR; 868 if (termios->c_cflag & CMSPAR) 869 cval |= UART_LCR_SPAR; 870 871 /* 872 * Ask the core to calculate the divisor for us. 873 */ 874 875 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 876 quot = serial_omap_get_divisor(port, baud); 877 878 /* calculate wakeup latency constraint */ 879 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8); 880 up->latency = up->calc_latency; 881 schedule_work(&up->qos_work); 882 883 up->dll = quot & 0xff; 884 up->dlh = quot >> 8; 885 up->mdr1 = UART_OMAP_MDR1_DISABLE; 886 887 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 888 UART_FCR_ENABLE_FIFO; 889 890 /* 891 * Ok, we're now changing the port state. Do it with 892 * interrupts disabled. 893 */ 894 pm_runtime_get_sync(up->dev); 895 spin_lock_irqsave(&up->port.lock, flags); 896 897 /* 898 * Update the per-port timeout. 899 */ 900 uart_update_timeout(port, termios->c_cflag, baud); 901 902 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 903 if (termios->c_iflag & INPCK) 904 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 905 if (termios->c_iflag & (BRKINT | PARMRK)) 906 up->port.read_status_mask |= UART_LSR_BI; 907 908 /* 909 * Characters to ignore 910 */ 911 up->port.ignore_status_mask = 0; 912 if (termios->c_iflag & IGNPAR) 913 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 914 if (termios->c_iflag & IGNBRK) { 915 up->port.ignore_status_mask |= UART_LSR_BI; 916 /* 917 * If we're ignoring parity and break indicators, 918 * ignore overruns too (for real raw support). 919 */ 920 if (termios->c_iflag & IGNPAR) 921 up->port.ignore_status_mask |= UART_LSR_OE; 922 } 923 924 /* 925 * ignore all characters if CREAD is not set 926 */ 927 if ((termios->c_cflag & CREAD) == 0) 928 up->port.ignore_status_mask |= UART_LSR_DR; 929 930 /* 931 * Modem status interrupts 932 */ 933 up->ier &= ~UART_IER_MSI; 934 if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 935 up->ier |= UART_IER_MSI; 936 serial_out(up, UART_IER, up->ier); 937 serial_out(up, UART_LCR, cval); /* reset DLAB */ 938 up->lcr = cval; 939 up->scr = 0; 940 941 /* FIFOs and DMA Settings */ 942 943 /* FCR can be changed only when the 944 * baud clock is not running 945 * DLL_REG and DLH_REG set to 0. 946 */ 947 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 948 serial_out(up, UART_DLL, 0); 949 serial_out(up, UART_DLM, 0); 950 serial_out(up, UART_LCR, 0); 951 952 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 953 954 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB; 955 up->efr &= ~UART_EFR_SCD; 956 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 957 958 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 959 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR; 960 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 961 /* FIFO ENABLE, DMA MODE */ 962 963 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK; 964 /* 965 * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK 966 * sets Enables the granularity of 1 for TRIGGER RX 967 * level. Along with setting RX FIFO trigger level 968 * to 1 (as noted below, 16 characters) and TLR[3:0] 969 * to zero this will result RX FIFO threshold level 970 * to 1 character, instead of 16 as noted in comment 971 * below. 972 */ 973 974 /* Set receive FIFO threshold to 16 characters and 975 * transmit FIFO threshold to 32 spaces 976 */ 977 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK; 978 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK; 979 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 | 980 UART_FCR_ENABLE_FIFO; 981 982 serial_out(up, UART_FCR, up->fcr); 983 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 984 985 serial_out(up, UART_OMAP_SCR, up->scr); 986 987 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */ 988 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 989 serial_out(up, UART_MCR, up->mcr); 990 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 991 serial_out(up, UART_EFR, up->efr); 992 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 993 994 /* Protocol, Baud Rate, and Interrupt Settings */ 995 996 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 997 serial_omap_mdr1_errataset(up, up->mdr1); 998 else 999 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1000 1001 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1002 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 1003 1004 serial_out(up, UART_LCR, 0); 1005 serial_out(up, UART_IER, 0); 1006 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1007 1008 serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 1009 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 1010 1011 serial_out(up, UART_LCR, 0); 1012 serial_out(up, UART_IER, up->ier); 1013 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1014 1015 serial_out(up, UART_EFR, up->efr); 1016 serial_out(up, UART_LCR, cval); 1017 1018 if (!serial_omap_baud_is_mode16(port, baud)) 1019 up->mdr1 = UART_OMAP_MDR1_13X_MODE; 1020 else 1021 up->mdr1 = UART_OMAP_MDR1_16X_MODE; 1022 1023 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1024 serial_omap_mdr1_errataset(up, up->mdr1); 1025 else 1026 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1027 1028 /* Configure flow control */ 1029 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1030 1031 /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */ 1032 serial_out(up, UART_XON1, termios->c_cc[VSTART]); 1033 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 1034 1035 /* Enable access to TCR/TLR */ 1036 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 1037 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1038 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 1039 1040 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 1041 1042 up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); 1043 1044 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) { 1045 /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */ 1046 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; 1047 up->efr |= UART_EFR_CTS; 1048 } else { 1049 /* Disable AUTORTS and AUTOCTS */ 1050 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS); 1051 } 1052 1053 if (up->port.flags & UPF_SOFT_FLOW) { 1054 /* clear SW control mode bits */ 1055 up->efr &= OMAP_UART_SW_CLR; 1056 1057 /* 1058 * IXON Flag: 1059 * Enable XON/XOFF flow control on input. 1060 * Receiver compares XON1, XOFF1. 1061 */ 1062 if (termios->c_iflag & IXON) 1063 up->efr |= OMAP_UART_SW_RX; 1064 1065 /* 1066 * IXOFF Flag: 1067 * Enable XON/XOFF flow control on output. 1068 * Transmit XON1, XOFF1 1069 */ 1070 if (termios->c_iflag & IXOFF) { 1071 up->port.status |= UPSTAT_AUTOXOFF; 1072 up->efr |= OMAP_UART_SW_TX; 1073 } 1074 1075 /* 1076 * IXANY Flag: 1077 * Enable any character to restart output. 1078 * Operation resumes after receiving any 1079 * character after recognition of the XOFF character 1080 */ 1081 if (termios->c_iflag & IXANY) 1082 up->mcr |= UART_MCR_XONANY; 1083 else 1084 up->mcr &= ~UART_MCR_XONANY; 1085 } 1086 serial_out(up, UART_MCR, up->mcr); 1087 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1088 serial_out(up, UART_EFR, up->efr); 1089 serial_out(up, UART_LCR, up->lcr); 1090 1091 serial_omap_set_mctrl(&up->port, up->port.mctrl); 1092 1093 spin_unlock_irqrestore(&up->port.lock, flags); 1094 pm_runtime_mark_last_busy(up->dev); 1095 pm_runtime_put_autosuspend(up->dev); 1096 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); 1097 } 1098 1099 static void 1100 serial_omap_pm(struct uart_port *port, unsigned int state, 1101 unsigned int oldstate) 1102 { 1103 struct uart_omap_port *up = to_uart_omap_port(port); 1104 unsigned char efr; 1105 1106 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); 1107 1108 pm_runtime_get_sync(up->dev); 1109 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1110 efr = serial_in(up, UART_EFR); 1111 serial_out(up, UART_EFR, efr | UART_EFR_ECB); 1112 serial_out(up, UART_LCR, 0); 1113 1114 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 1115 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1116 serial_out(up, UART_EFR, efr); 1117 serial_out(up, UART_LCR, 0); 1118 1119 pm_runtime_mark_last_busy(up->dev); 1120 pm_runtime_put_autosuspend(up->dev); 1121 } 1122 1123 static void serial_omap_release_port(struct uart_port *port) 1124 { 1125 dev_dbg(port->dev, "serial_omap_release_port+\n"); 1126 } 1127 1128 static int serial_omap_request_port(struct uart_port *port) 1129 { 1130 dev_dbg(port->dev, "serial_omap_request_port+\n"); 1131 return 0; 1132 } 1133 1134 static void serial_omap_config_port(struct uart_port *port, int flags) 1135 { 1136 struct uart_omap_port *up = to_uart_omap_port(port); 1137 1138 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 1139 up->port.line); 1140 up->port.type = PORT_OMAP; 1141 up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW; 1142 } 1143 1144 static int 1145 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 1146 { 1147 /* we don't want the core code to modify any port params */ 1148 dev_dbg(port->dev, "serial_omap_verify_port+\n"); 1149 return -EINVAL; 1150 } 1151 1152 static const char * 1153 serial_omap_type(struct uart_port *port) 1154 { 1155 struct uart_omap_port *up = to_uart_omap_port(port); 1156 1157 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line); 1158 return up->name; 1159 } 1160 1161 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 1162 1163 static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up) 1164 { 1165 unsigned int status, tmout = 10000; 1166 1167 /* Wait up to 10ms for the character(s) to be sent. */ 1168 do { 1169 status = serial_in(up, UART_LSR); 1170 1171 if (status & UART_LSR_BI) 1172 up->lsr_break_flag = UART_LSR_BI; 1173 1174 if (--tmout == 0) 1175 break; 1176 udelay(1); 1177 } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 1178 1179 /* Wait up to 1s for flow control if necessary */ 1180 if (up->port.flags & UPF_CONS_FLOW) { 1181 tmout = 1000000; 1182 for (tmout = 1000000; tmout; tmout--) { 1183 unsigned int msr = serial_in(up, UART_MSR); 1184 1185 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 1186 if (msr & UART_MSR_CTS) 1187 break; 1188 1189 udelay(1); 1190 } 1191 } 1192 } 1193 1194 #ifdef CONFIG_CONSOLE_POLL 1195 1196 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 1197 { 1198 struct uart_omap_port *up = to_uart_omap_port(port); 1199 1200 pm_runtime_get_sync(up->dev); 1201 wait_for_xmitr(up); 1202 serial_out(up, UART_TX, ch); 1203 pm_runtime_mark_last_busy(up->dev); 1204 pm_runtime_put_autosuspend(up->dev); 1205 } 1206 1207 static int serial_omap_poll_get_char(struct uart_port *port) 1208 { 1209 struct uart_omap_port *up = to_uart_omap_port(port); 1210 unsigned int status; 1211 1212 pm_runtime_get_sync(up->dev); 1213 status = serial_in(up, UART_LSR); 1214 if (!(status & UART_LSR_DR)) { 1215 status = NO_POLL_CHAR; 1216 goto out; 1217 } 1218 1219 status = serial_in(up, UART_RX); 1220 1221 out: 1222 pm_runtime_mark_last_busy(up->dev); 1223 pm_runtime_put_autosuspend(up->dev); 1224 1225 return status; 1226 } 1227 1228 #endif /* CONFIG_CONSOLE_POLL */ 1229 1230 #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1231 1232 #ifdef CONFIG_SERIAL_EARLYCON 1233 static unsigned int omap_serial_early_in(struct uart_port *port, int offset) 1234 { 1235 offset <<= port->regshift; 1236 return readw(port->membase + offset); 1237 } 1238 1239 static void omap_serial_early_out(struct uart_port *port, int offset, 1240 int value) 1241 { 1242 offset <<= port->regshift; 1243 writew(value, port->membase + offset); 1244 } 1245 1246 static void omap_serial_early_putc(struct uart_port *port, int c) 1247 { 1248 unsigned int status; 1249 1250 for (;;) { 1251 status = omap_serial_early_in(port, UART_LSR); 1252 if ((status & BOTH_EMPTY) == BOTH_EMPTY) 1253 break; 1254 cpu_relax(); 1255 } 1256 omap_serial_early_out(port, UART_TX, c); 1257 } 1258 1259 static void early_omap_serial_write(struct console *console, const char *s, 1260 unsigned int count) 1261 { 1262 struct earlycon_device *device = console->data; 1263 struct uart_port *port = &device->port; 1264 1265 uart_console_write(port, s, count, omap_serial_early_putc); 1266 } 1267 1268 static int __init early_omap_serial_setup(struct earlycon_device *device, 1269 const char *options) 1270 { 1271 struct uart_port *port = &device->port; 1272 1273 if (!(device->port.membase || device->port.iobase)) 1274 return -ENODEV; 1275 1276 port->regshift = 2; 1277 device->con->write = early_omap_serial_write; 1278 return 0; 1279 } 1280 1281 OF_EARLYCON_DECLARE(omapserial, "ti,omap2-uart", early_omap_serial_setup); 1282 OF_EARLYCON_DECLARE(omapserial, "ti,omap3-uart", early_omap_serial_setup); 1283 OF_EARLYCON_DECLARE(omapserial, "ti,omap4-uart", early_omap_serial_setup); 1284 #endif /* CONFIG_SERIAL_EARLYCON */ 1285 1286 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS]; 1287 1288 static struct uart_driver serial_omap_reg; 1289 1290 static void serial_omap_console_putchar(struct uart_port *port, int ch) 1291 { 1292 struct uart_omap_port *up = to_uart_omap_port(port); 1293 1294 wait_for_xmitr(up); 1295 serial_out(up, UART_TX, ch); 1296 } 1297 1298 static void 1299 serial_omap_console_write(struct console *co, const char *s, 1300 unsigned int count) 1301 { 1302 struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1303 unsigned long flags; 1304 unsigned int ier; 1305 int locked = 1; 1306 1307 pm_runtime_get_sync(up->dev); 1308 1309 local_irq_save(flags); 1310 if (up->port.sysrq) 1311 locked = 0; 1312 else if (oops_in_progress) 1313 locked = spin_trylock(&up->port.lock); 1314 else 1315 spin_lock(&up->port.lock); 1316 1317 /* 1318 * First save the IER then disable the interrupts 1319 */ 1320 ier = serial_in(up, UART_IER); 1321 serial_out(up, UART_IER, 0); 1322 1323 uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1324 1325 /* 1326 * Finally, wait for transmitter to become empty 1327 * and restore the IER 1328 */ 1329 wait_for_xmitr(up); 1330 serial_out(up, UART_IER, ier); 1331 /* 1332 * The receive handling will happen properly because the 1333 * receive ready bit will still be set; it is not cleared 1334 * on read. However, modem control will not, we must 1335 * call it if we have saved something in the saved flags 1336 * while processing with interrupts off. 1337 */ 1338 if (up->msr_saved_flags) 1339 check_modem_status(up); 1340 1341 pm_runtime_mark_last_busy(up->dev); 1342 pm_runtime_put_autosuspend(up->dev); 1343 if (locked) 1344 spin_unlock(&up->port.lock); 1345 local_irq_restore(flags); 1346 } 1347 1348 static int __init 1349 serial_omap_console_setup(struct console *co, char *options) 1350 { 1351 struct uart_omap_port *up; 1352 int baud = 115200; 1353 int bits = 8; 1354 int parity = 'n'; 1355 int flow = 'n'; 1356 1357 if (serial_omap_console_ports[co->index] == NULL) 1358 return -ENODEV; 1359 up = serial_omap_console_ports[co->index]; 1360 1361 if (options) 1362 uart_parse_options(options, &baud, &parity, &bits, &flow); 1363 1364 return uart_set_options(&up->port, co, baud, parity, bits, flow); 1365 } 1366 1367 static struct console serial_omap_console = { 1368 .name = OMAP_SERIAL_NAME, 1369 .write = serial_omap_console_write, 1370 .device = uart_console_device, 1371 .setup = serial_omap_console_setup, 1372 .flags = CON_PRINTBUFFER, 1373 .index = -1, 1374 .data = &serial_omap_reg, 1375 }; 1376 1377 static void serial_omap_add_console_port(struct uart_omap_port *up) 1378 { 1379 serial_omap_console_ports[up->port.line] = up; 1380 } 1381 1382 #define OMAP_CONSOLE (&serial_omap_console) 1383 1384 #else 1385 1386 #define OMAP_CONSOLE NULL 1387 1388 static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1389 {} 1390 1391 #endif 1392 1393 /* Enable or disable the rs485 support */ 1394 static int 1395 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485) 1396 { 1397 struct uart_omap_port *up = to_uart_omap_port(port); 1398 unsigned int mode; 1399 int val; 1400 1401 pm_runtime_get_sync(up->dev); 1402 1403 /* Disable interrupts from this port */ 1404 mode = up->ier; 1405 up->ier = 0; 1406 serial_out(up, UART_IER, 0); 1407 1408 /* Clamp the delays to [0, 100ms] */ 1409 rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U); 1410 rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U); 1411 1412 /* store new config */ 1413 port->rs485 = *rs485; 1414 1415 /* 1416 * Just as a precaution, only allow rs485 1417 * to be enabled if the gpio pin is valid 1418 */ 1419 if (gpio_is_valid(up->rts_gpio)) { 1420 /* enable / disable rts */ 1421 val = (port->rs485.flags & SER_RS485_ENABLED) ? 1422 SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND; 1423 val = (port->rs485.flags & val) ? 1 : 0; 1424 gpio_set_value(up->rts_gpio, val); 1425 } else 1426 port->rs485.flags &= ~SER_RS485_ENABLED; 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_node *np) 1602 { 1603 struct serial_rs485 *rs485conf = &up->port.rs485; 1604 int ret; 1605 1606 rs485conf->flags = 0; 1607 up->rts_gpio = -EINVAL; 1608 1609 if (!np) 1610 return 0; 1611 1612 uart_get_rs485_mode(up->dev, rs485conf); 1613 1614 if (of_property_read_bool(np, "rs485-rts-active-high")) { 1615 rs485conf->flags |= SER_RS485_RTS_ON_SEND; 1616 rs485conf->flags &= ~SER_RS485_RTS_AFTER_SEND; 1617 } else { 1618 rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 1619 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 1620 } 1621 1622 /* check for tx enable gpio */ 1623 up->rts_gpio = of_get_named_gpio(np, "rts-gpio", 0); 1624 if (gpio_is_valid(up->rts_gpio)) { 1625 ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial"); 1626 if (ret < 0) 1627 return ret; 1628 ret = rs485conf->flags & SER_RS485_RTS_AFTER_SEND ? 1 : 0; 1629 ret = gpio_direction_output(up->rts_gpio, ret); 1630 if (ret < 0) 1631 return ret; 1632 } else if (up->rts_gpio == -EPROBE_DEFER) { 1633 return -EPROBE_DEFER; 1634 } else { 1635 up->rts_gpio = -EINVAL; 1636 } 1637 1638 return 0; 1639 } 1640 1641 static int serial_omap_probe(struct platform_device *pdev) 1642 { 1643 struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev); 1644 struct uart_omap_port *up; 1645 struct resource *mem; 1646 void __iomem *base; 1647 int uartirq = 0; 1648 int wakeirq = 0; 1649 int ret; 1650 1651 /* The optional wakeirq may be specified in the board dts file */ 1652 if (pdev->dev.of_node) { 1653 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0); 1654 if (!uartirq) 1655 return -EPROBE_DEFER; 1656 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1); 1657 omap_up_info = of_get_uart_port_info(&pdev->dev); 1658 pdev->dev.platform_data = omap_up_info; 1659 } else { 1660 uartirq = platform_get_irq(pdev, 0); 1661 if (uartirq < 0) 1662 return -EPROBE_DEFER; 1663 } 1664 1665 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL); 1666 if (!up) 1667 return -ENOMEM; 1668 1669 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1670 base = devm_ioremap_resource(&pdev->dev, mem); 1671 if (IS_ERR(base)) 1672 return PTR_ERR(base); 1673 1674 up->dev = &pdev->dev; 1675 up->port.dev = &pdev->dev; 1676 up->port.type = PORT_OMAP; 1677 up->port.iotype = UPIO_MEM; 1678 up->port.irq = uartirq; 1679 up->port.regshift = 2; 1680 up->port.fifosize = 64; 1681 up->port.ops = &serial_omap_pops; 1682 up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_OMAP_CONSOLE); 1683 1684 if (pdev->dev.of_node) 1685 ret = of_alias_get_id(pdev->dev.of_node, "serial"); 1686 else 1687 ret = pdev->id; 1688 1689 if (ret < 0) { 1690 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", 1691 ret); 1692 goto err_port_line; 1693 } 1694 up->port.line = ret; 1695 1696 if (up->port.line >= OMAP_MAX_HSUART_PORTS) { 1697 dev_err(&pdev->dev, "uart ID %d > MAX %d.\n", up->port.line, 1698 OMAP_MAX_HSUART_PORTS); 1699 ret = -ENXIO; 1700 goto err_port_line; 1701 } 1702 1703 up->wakeirq = wakeirq; 1704 if (!up->wakeirq) 1705 dev_info(up->port.dev, "no wakeirq for uart%d\n", 1706 up->port.line); 1707 1708 ret = serial_omap_probe_rs485(up, pdev->dev.of_node); 1709 if (ret < 0) 1710 goto err_rs485; 1711 1712 sprintf(up->name, "OMAP UART%d", up->port.line); 1713 up->port.mapbase = mem->start; 1714 up->port.membase = base; 1715 up->port.flags = omap_up_info->flags; 1716 up->port.uartclk = omap_up_info->uartclk; 1717 up->port.rs485_config = serial_omap_config_rs485; 1718 if (!up->port.uartclk) { 1719 up->port.uartclk = DEFAULT_CLK_SPEED; 1720 dev_warn(&pdev->dev, 1721 "No clock speed specified: using default: %d\n", 1722 DEFAULT_CLK_SPEED); 1723 } 1724 1725 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1726 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1727 pm_qos_add_request(&up->pm_qos_request, 1728 PM_QOS_CPU_DMA_LATENCY, up->latency); 1729 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); 1730 1731 platform_set_drvdata(pdev, up); 1732 if (omap_up_info->autosuspend_timeout == 0) 1733 omap_up_info->autosuspend_timeout = -1; 1734 1735 device_init_wakeup(up->dev, true); 1736 pm_runtime_use_autosuspend(&pdev->dev); 1737 pm_runtime_set_autosuspend_delay(&pdev->dev, 1738 omap_up_info->autosuspend_timeout); 1739 1740 pm_runtime_irq_safe(&pdev->dev); 1741 pm_runtime_enable(&pdev->dev); 1742 1743 pm_runtime_get_sync(&pdev->dev); 1744 1745 omap_serial_fill_features_erratas(up); 1746 1747 ui[up->port.line] = up; 1748 serial_omap_add_console_port(up); 1749 1750 ret = uart_add_one_port(&serial_omap_reg, &up->port); 1751 if (ret != 0) 1752 goto err_add_port; 1753 1754 pm_runtime_mark_last_busy(up->dev); 1755 pm_runtime_put_autosuspend(up->dev); 1756 return 0; 1757 1758 err_add_port: 1759 pm_runtime_dont_use_autosuspend(&pdev->dev); 1760 pm_runtime_put_sync(&pdev->dev); 1761 pm_runtime_disable(&pdev->dev); 1762 pm_qos_remove_request(&up->pm_qos_request); 1763 device_init_wakeup(up->dev, false); 1764 err_rs485: 1765 err_port_line: 1766 return ret; 1767 } 1768 1769 static int serial_omap_remove(struct platform_device *dev) 1770 { 1771 struct uart_omap_port *up = platform_get_drvdata(dev); 1772 1773 pm_runtime_get_sync(up->dev); 1774 1775 uart_remove_one_port(&serial_omap_reg, &up->port); 1776 1777 pm_runtime_dont_use_autosuspend(up->dev); 1778 pm_runtime_put_sync(up->dev); 1779 pm_runtime_disable(up->dev); 1780 pm_qos_remove_request(&up->pm_qos_request); 1781 device_init_wakeup(&dev->dev, false); 1782 1783 return 0; 1784 } 1785 1786 /* 1787 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 1788 * The access to uart register after MDR1 Access 1789 * causes UART to corrupt data. 1790 * 1791 * Need a delay = 1792 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 1793 * give 10 times as much 1794 */ 1795 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 1796 { 1797 u8 timeout = 255; 1798 1799 serial_out(up, UART_OMAP_MDR1, mdr1); 1800 udelay(2); 1801 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 1802 UART_FCR_CLEAR_RCVR); 1803 /* 1804 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 1805 * TX_FIFO_E bit is 1. 1806 */ 1807 while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 1808 (UART_LSR_THRE | UART_LSR_DR))) { 1809 timeout--; 1810 if (!timeout) { 1811 /* Should *never* happen. we warn and carry on */ 1812 dev_crit(up->dev, "Errata i202: timedout %x\n", 1813 serial_in(up, UART_LSR)); 1814 break; 1815 } 1816 udelay(1); 1817 } 1818 } 1819 1820 #ifdef CONFIG_PM 1821 static void serial_omap_restore_context(struct uart_omap_port *up) 1822 { 1823 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1824 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 1825 else 1826 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 1827 1828 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1829 serial_out(up, UART_EFR, UART_EFR_ECB); 1830 serial_out(up, UART_LCR, 0x0); /* Operational mode */ 1831 serial_out(up, UART_IER, 0x0); 1832 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1833 serial_out(up, UART_DLL, up->dll); 1834 serial_out(up, UART_DLM, up->dlh); 1835 serial_out(up, UART_LCR, 0x0); /* Operational mode */ 1836 serial_out(up, UART_IER, up->ier); 1837 serial_out(up, UART_FCR, up->fcr); 1838 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1839 serial_out(up, UART_MCR, up->mcr); 1840 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1841 serial_out(up, UART_OMAP_SCR, up->scr); 1842 serial_out(up, UART_EFR, up->efr); 1843 serial_out(up, UART_LCR, up->lcr); 1844 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1845 serial_omap_mdr1_errataset(up, up->mdr1); 1846 else 1847 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1848 serial_out(up, UART_OMAP_WER, up->wer); 1849 } 1850 1851 static int serial_omap_runtime_suspend(struct device *dev) 1852 { 1853 struct uart_omap_port *up = dev_get_drvdata(dev); 1854 1855 if (!up) 1856 return -EINVAL; 1857 1858 /* 1859 * When using 'no_console_suspend', the console UART must not be 1860 * suspended. Since driver suspend is managed by runtime suspend, 1861 * preventing runtime suspend (by returning error) will keep device 1862 * active during suspend. 1863 */ 1864 if (up->is_suspending && !console_suspend_enabled && 1865 uart_console(&up->port)) 1866 return -EBUSY; 1867 1868 up->context_loss_cnt = serial_omap_get_context_loss_count(up); 1869 1870 serial_omap_enable_wakeup(up, true); 1871 1872 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1873 schedule_work(&up->qos_work); 1874 1875 return 0; 1876 } 1877 1878 static int serial_omap_runtime_resume(struct device *dev) 1879 { 1880 struct uart_omap_port *up = dev_get_drvdata(dev); 1881 1882 int loss_cnt = serial_omap_get_context_loss_count(up); 1883 1884 serial_omap_enable_wakeup(up, false); 1885 1886 if (loss_cnt < 0) { 1887 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n", 1888 loss_cnt); 1889 serial_omap_restore_context(up); 1890 } else if (up->context_loss_cnt != loss_cnt) { 1891 serial_omap_restore_context(up); 1892 } 1893 up->latency = up->calc_latency; 1894 schedule_work(&up->qos_work); 1895 1896 return 0; 1897 } 1898 #endif 1899 1900 static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1901 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1902 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1903 serial_omap_runtime_resume, NULL) 1904 .prepare = serial_omap_prepare, 1905 .complete = serial_omap_complete, 1906 }; 1907 1908 #if defined(CONFIG_OF) 1909 static const struct of_device_id omap_serial_of_match[] = { 1910 { .compatible = "ti,omap2-uart" }, 1911 { .compatible = "ti,omap3-uart" }, 1912 { .compatible = "ti,omap4-uart" }, 1913 {}, 1914 }; 1915 MODULE_DEVICE_TABLE(of, omap_serial_of_match); 1916 #endif 1917 1918 static struct platform_driver serial_omap_driver = { 1919 .probe = serial_omap_probe, 1920 .remove = serial_omap_remove, 1921 .driver = { 1922 .name = OMAP_SERIAL_DRIVER_NAME, 1923 .pm = &serial_omap_dev_pm_ops, 1924 .of_match_table = of_match_ptr(omap_serial_of_match), 1925 }, 1926 }; 1927 1928 static int __init serial_omap_init(void) 1929 { 1930 int ret; 1931 1932 ret = uart_register_driver(&serial_omap_reg); 1933 if (ret != 0) 1934 return ret; 1935 ret = platform_driver_register(&serial_omap_driver); 1936 if (ret != 0) 1937 uart_unregister_driver(&serial_omap_reg); 1938 return ret; 1939 } 1940 1941 static void __exit serial_omap_exit(void) 1942 { 1943 platform_driver_unregister(&serial_omap_driver); 1944 uart_unregister_driver(&serial_omap_reg); 1945 } 1946 1947 module_init(serial_omap_init); 1948 module_exit(serial_omap_exit); 1949 1950 MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1951 MODULE_LICENSE("GPL"); 1952 MODULE_AUTHOR("Texas Instruments Inc"); 1953