1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Driver for OMAP-UART controller. 4 * Based on drivers/serial/8250.c 5 * 6 * Copyright (C) 2010 Texas Instruments. 7 * 8 * Authors: 9 * Govindraj R <govindraj.raja@ti.com> 10 * Thara Gopinath <thara@ti.com> 11 * 12 * Note: This driver is made separate from 8250 driver as we cannot 13 * over load 8250 driver with omap platform specific configuration for 14 * features like DMA, it makes easier to implement features like DMA and 15 * hardware flow control and software flow control configuration with 16 * this driver as required for the omap-platform. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/console.h> 22 #include <linux/serial_reg.h> 23 #include <linux/delay.h> 24 #include <linux/slab.h> 25 #include <linux/tty.h> 26 #include <linux/tty_flip.h> 27 #include <linux/platform_device.h> 28 #include <linux/io.h> 29 #include <linux/clk.h> 30 #include <linux/serial_core.h> 31 #include <linux/irq.h> 32 #include <linux/pm_runtime.h> 33 #include <linux/pm_wakeirq.h> 34 #include <linux/of.h> 35 #include <linux/of_irq.h> 36 #include <linux/gpio/consumer.h> 37 #include <linux/platform_data/serial-omap.h> 38 39 #define OMAP_MAX_HSUART_PORTS 10 40 41 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y)) 42 43 #define OMAP_UART_REV_42 0x0402 44 #define OMAP_UART_REV_46 0x0406 45 #define OMAP_UART_REV_52 0x0502 46 #define OMAP_UART_REV_63 0x0603 47 48 #define OMAP_UART_TX_WAKEUP_EN BIT(7) 49 50 /* Feature flags */ 51 #define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0) 52 53 #define UART_ERRATA_i202_MDR1_ACCESS BIT(0) 54 #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1) 55 56 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz */ 57 58 /* SCR register bitmasks */ 59 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) 60 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6) 61 #define OMAP_UART_SCR_TX_EMPTY (1 << 3) 62 63 /* FCR register bitmasks */ 64 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6) 65 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4) 66 67 /* MVR register bitmasks */ 68 #define OMAP_UART_MVR_SCHEME_SHIFT 30 69 70 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0 71 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4 72 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f 73 74 #define OMAP_UART_MVR_MAJ_MASK 0x700 75 #define OMAP_UART_MVR_MAJ_SHIFT 8 76 #define OMAP_UART_MVR_MIN_MASK 0x3f 77 78 #define OMAP_UART_DMA_CH_FREE -1 79 80 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA 81 #define OMAP_MODE13X_SPEED 230400 82 83 /* WER = 0x7F 84 * Enable module level wakeup in WER reg 85 */ 86 #define OMAP_UART_WER_MOD_WKUP 0x7F 87 88 /* Enable XON/XOFF flow control on output */ 89 #define OMAP_UART_SW_TX 0x08 90 91 /* Enable XON/XOFF flow control on input */ 92 #define OMAP_UART_SW_RX 0x02 93 94 #define OMAP_UART_SW_CLR 0xF0 95 96 #define OMAP_UART_TCR_TRIG 0x0F 97 98 struct uart_omap_dma { 99 u8 uart_dma_tx; 100 u8 uart_dma_rx; 101 int rx_dma_channel; 102 int tx_dma_channel; 103 dma_addr_t rx_buf_dma_phys; 104 dma_addr_t tx_buf_dma_phys; 105 unsigned int uart_base; 106 /* 107 * Buffer for rx dma. It is not required for tx because the buffer 108 * comes from port structure. 109 */ 110 unsigned char *rx_buf; 111 unsigned int prev_rx_dma_pos; 112 int tx_buf_size; 113 int tx_dma_used; 114 int rx_dma_used; 115 spinlock_t tx_lock; 116 spinlock_t rx_lock; 117 /* timer to poll activity on rx dma */ 118 struct timer_list rx_timer; 119 unsigned int rx_buf_size; 120 unsigned int rx_poll_rate; 121 unsigned int rx_timeout; 122 }; 123 124 struct uart_omap_port { 125 struct uart_port port; 126 struct uart_omap_dma uart_dma; 127 struct device *dev; 128 int wakeirq; 129 130 unsigned char ier; 131 unsigned char lcr; 132 unsigned char mcr; 133 unsigned char fcr; 134 unsigned char efr; 135 unsigned char dll; 136 unsigned char dlh; 137 unsigned char mdr1; 138 unsigned char scr; 139 unsigned char wer; 140 141 int use_dma; 142 /* 143 * Some bits in registers are cleared on a read, so they must 144 * be saved whenever the register is read, but the bits will not 145 * be immediately processed. 146 */ 147 unsigned int lsr_break_flag; 148 unsigned char msr_saved_flags; 149 char name[20]; 150 unsigned long port_activity; 151 int context_loss_cnt; 152 u32 errata; 153 u32 features; 154 155 struct gpio_desc *rts_gpiod; 156 157 struct pm_qos_request pm_qos_request; 158 u32 latency; 159 u32 calc_latency; 160 struct work_struct qos_work; 161 bool is_suspending; 162 }; 163 164 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port))) 165 166 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 167 168 /* Forward declaration of functions */ 169 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 170 171 static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 172 { 173 offset <<= up->port.regshift; 174 return readw(up->port.membase + offset); 175 } 176 177 static inline void serial_out(struct uart_omap_port *up, int offset, int value) 178 { 179 offset <<= up->port.regshift; 180 writew(value, up->port.membase + offset); 181 } 182 183 static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 184 { 185 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 186 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 187 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 188 serial_out(up, UART_FCR, 0); 189 } 190 191 #ifdef CONFIG_PM 192 static int serial_omap_get_context_loss_count(struct uart_omap_port *up) 193 { 194 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev); 195 196 if (!pdata || !pdata->get_context_loss_count) 197 return -EINVAL; 198 199 return pdata->get_context_loss_count(up->dev); 200 } 201 202 /* REVISIT: Remove this when omap3 boots in device tree only mode */ 203 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable) 204 { 205 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev); 206 207 if (!pdata || !pdata->enable_wakeup) 208 return; 209 210 pdata->enable_wakeup(up->dev, enable); 211 } 212 #endif /* CONFIG_PM */ 213 214 /* 215 * Calculate the absolute difference between the desired and actual baud 216 * rate for the given mode. 217 */ 218 static inline int calculate_baud_abs_diff(struct uart_port *port, 219 unsigned int baud, unsigned int mode) 220 { 221 unsigned int n = port->uartclk / (mode * baud); 222 int abs_diff; 223 224 if (n == 0) 225 n = 1; 226 227 abs_diff = baud - (port->uartclk / (mode * n)); 228 if (abs_diff < 0) 229 abs_diff = -abs_diff; 230 231 return abs_diff; 232 } 233 234 /* 235 * serial_omap_baud_is_mode16 - check if baud rate is MODE16X 236 * @port: uart port info 237 * @baud: baudrate for which mode needs to be determined 238 * 239 * Returns true if baud rate is MODE16X and false if MODE13X 240 * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values, 241 * and Error Rates" determines modes not for all common baud rates. 242 * E.g. for 1000000 baud rate mode must be 16x, but according to that 243 * table it's determined as 13x. 244 */ 245 static bool 246 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud) 247 { 248 int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13); 249 int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16); 250 251 return (abs_diff_13 >= abs_diff_16); 252 } 253 254 /* 255 * serial_omap_get_divisor - calculate divisor value 256 * @port: uart port info 257 * @baud: baudrate for which divisor needs to be calculated. 258 */ 259 static unsigned int 260 serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 261 { 262 unsigned int mode; 263 264 if (!serial_omap_baud_is_mode16(port, baud)) 265 mode = 13; 266 else 267 mode = 16; 268 return port->uartclk/(mode * baud); 269 } 270 271 static void serial_omap_enable_ms(struct uart_port *port) 272 { 273 struct uart_omap_port *up = to_uart_omap_port(port); 274 275 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); 276 277 pm_runtime_get_sync(up->dev); 278 up->ier |= UART_IER_MSI; 279 serial_out(up, UART_IER, up->ier); 280 pm_runtime_mark_last_busy(up->dev); 281 pm_runtime_put_autosuspend(up->dev); 282 } 283 284 static void serial_omap_stop_tx(struct uart_port *port) 285 { 286 struct uart_omap_port *up = to_uart_omap_port(port); 287 int res; 288 289 pm_runtime_get_sync(up->dev); 290 291 /* Handle RS-485 */ 292 if (port->rs485.flags & SER_RS485_ENABLED) { 293 if (up->scr & OMAP_UART_SCR_TX_EMPTY) { 294 /* THR interrupt is fired when both TX FIFO and TX 295 * shift register are empty. This means there's nothing 296 * left to transmit now, so make sure the THR interrupt 297 * is fired when TX FIFO is below the trigger level, 298 * disable THR interrupts and toggle the RS-485 GPIO 299 * data direction pin if needed. 300 */ 301 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 302 serial_out(up, UART_OMAP_SCR, up->scr); 303 res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 304 1 : 0; 305 if (gpiod_get_value(up->rts_gpiod) != res) { 306 if (port->rs485.delay_rts_after_send > 0) 307 mdelay( 308 port->rs485.delay_rts_after_send); 309 gpiod_set_value(up->rts_gpiod, res); 310 } 311 } else { 312 /* We're asked to stop, but there's still stuff in the 313 * UART FIFO, so make sure the THR interrupt is fired 314 * when both TX FIFO and TX shift register are empty. 315 * The next THR interrupt (if no transmission is started 316 * in the meantime) will indicate the end of a 317 * transmission. Therefore we _don't_ disable THR 318 * interrupts in this situation. 319 */ 320 up->scr |= OMAP_UART_SCR_TX_EMPTY; 321 serial_out(up, UART_OMAP_SCR, up->scr); 322 return; 323 } 324 } 325 326 if (up->ier & UART_IER_THRI) { 327 up->ier &= ~UART_IER_THRI; 328 serial_out(up, UART_IER, up->ier); 329 } 330 331 if ((port->rs485.flags & SER_RS485_ENABLED) && 332 !(port->rs485.flags & SER_RS485_RX_DURING_TX)) { 333 /* 334 * Empty the RX FIFO, we are not interested in anything 335 * received during the half-duplex transmission. 336 */ 337 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_RCVR); 338 /* Re-enable RX interrupts */ 339 up->ier |= UART_IER_RLSI | UART_IER_RDI; 340 up->port.read_status_mask |= UART_LSR_DR; 341 serial_out(up, UART_IER, up->ier); 342 } 343 344 pm_runtime_mark_last_busy(up->dev); 345 pm_runtime_put_autosuspend(up->dev); 346 } 347 348 static void serial_omap_stop_rx(struct uart_port *port) 349 { 350 struct uart_omap_port *up = to_uart_omap_port(port); 351 352 pm_runtime_get_sync(up->dev); 353 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); 354 up->port.read_status_mask &= ~UART_LSR_DR; 355 serial_out(up, UART_IER, up->ier); 356 pm_runtime_mark_last_busy(up->dev); 357 pm_runtime_put_autosuspend(up->dev); 358 } 359 360 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr) 361 { 362 struct circ_buf *xmit = &up->port.state->xmit; 363 int count; 364 365 if (up->port.x_char) { 366 serial_out(up, UART_TX, up->port.x_char); 367 up->port.icount.tx++; 368 up->port.x_char = 0; 369 return; 370 } 371 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 372 serial_omap_stop_tx(&up->port); 373 return; 374 } 375 count = up->port.fifosize / 4; 376 do { 377 serial_out(up, UART_TX, xmit->buf[xmit->tail]); 378 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 379 up->port.icount.tx++; 380 if (uart_circ_empty(xmit)) 381 break; 382 } while (--count > 0); 383 384 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 385 uart_write_wakeup(&up->port); 386 387 if (uart_circ_empty(xmit)) 388 serial_omap_stop_tx(&up->port); 389 } 390 391 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 392 { 393 if (!(up->ier & UART_IER_THRI)) { 394 up->ier |= UART_IER_THRI; 395 serial_out(up, UART_IER, up->ier); 396 } 397 } 398 399 static void serial_omap_start_tx(struct uart_port *port) 400 { 401 struct uart_omap_port *up = to_uart_omap_port(port); 402 int res; 403 404 pm_runtime_get_sync(up->dev); 405 406 /* Handle RS-485 */ 407 if (port->rs485.flags & SER_RS485_ENABLED) { 408 /* Fire THR interrupts when FIFO is below trigger level */ 409 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 410 serial_out(up, UART_OMAP_SCR, up->scr); 411 412 /* if rts not already enabled */ 413 res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0; 414 if (gpiod_get_value(up->rts_gpiod) != res) { 415 gpiod_set_value(up->rts_gpiod, res); 416 if (port->rs485.delay_rts_before_send > 0) 417 mdelay(port->rs485.delay_rts_before_send); 418 } 419 } 420 421 if ((port->rs485.flags & SER_RS485_ENABLED) && 422 !(port->rs485.flags & SER_RS485_RX_DURING_TX)) 423 serial_omap_stop_rx(port); 424 425 serial_omap_enable_ier_thri(up); 426 pm_runtime_mark_last_busy(up->dev); 427 pm_runtime_put_autosuspend(up->dev); 428 } 429 430 static void serial_omap_throttle(struct uart_port *port) 431 { 432 struct uart_omap_port *up = to_uart_omap_port(port); 433 unsigned long flags; 434 435 pm_runtime_get_sync(up->dev); 436 spin_lock_irqsave(&up->port.lock, flags); 437 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); 438 serial_out(up, UART_IER, up->ier); 439 spin_unlock_irqrestore(&up->port.lock, flags); 440 pm_runtime_mark_last_busy(up->dev); 441 pm_runtime_put_autosuspend(up->dev); 442 } 443 444 static void serial_omap_unthrottle(struct uart_port *port) 445 { 446 struct uart_omap_port *up = to_uart_omap_port(port); 447 unsigned long flags; 448 449 pm_runtime_get_sync(up->dev); 450 spin_lock_irqsave(&up->port.lock, flags); 451 up->ier |= UART_IER_RLSI | UART_IER_RDI; 452 serial_out(up, UART_IER, up->ier); 453 spin_unlock_irqrestore(&up->port.lock, flags); 454 pm_runtime_mark_last_busy(up->dev); 455 pm_runtime_put_autosuspend(up->dev); 456 } 457 458 static unsigned int check_modem_status(struct uart_omap_port *up) 459 { 460 unsigned int status; 461 462 status = serial_in(up, UART_MSR); 463 status |= up->msr_saved_flags; 464 up->msr_saved_flags = 0; 465 if ((status & UART_MSR_ANY_DELTA) == 0) 466 return status; 467 468 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 469 up->port.state != NULL) { 470 if (status & UART_MSR_TERI) 471 up->port.icount.rng++; 472 if (status & UART_MSR_DDSR) 473 up->port.icount.dsr++; 474 if (status & UART_MSR_DDCD) 475 uart_handle_dcd_change 476 (&up->port, status & UART_MSR_DCD); 477 if (status & UART_MSR_DCTS) 478 uart_handle_cts_change 479 (&up->port, status & UART_MSR_CTS); 480 wake_up_interruptible(&up->port.state->port.delta_msr_wait); 481 } 482 483 return status; 484 } 485 486 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr) 487 { 488 unsigned int flag; 489 490 /* 491 * Read one data character out to avoid stalling the receiver according 492 * to the table 23-246 of the omap4 TRM. 493 */ 494 if (likely(lsr & UART_LSR_DR)) 495 serial_in(up, UART_RX); 496 497 up->port.icount.rx++; 498 flag = TTY_NORMAL; 499 500 if (lsr & UART_LSR_BI) { 501 flag = TTY_BREAK; 502 lsr &= ~(UART_LSR_FE | UART_LSR_PE); 503 up->port.icount.brk++; 504 /* 505 * We do the SysRQ and SAK checking 506 * here because otherwise the break 507 * may get masked by ignore_status_mask 508 * or read_status_mask. 509 */ 510 if (uart_handle_break(&up->port)) 511 return; 512 513 } 514 515 if (lsr & UART_LSR_PE) { 516 flag = TTY_PARITY; 517 up->port.icount.parity++; 518 } 519 520 if (lsr & UART_LSR_FE) { 521 flag = TTY_FRAME; 522 up->port.icount.frame++; 523 } 524 525 if (lsr & UART_LSR_OE) 526 up->port.icount.overrun++; 527 528 #ifdef CONFIG_SERIAL_OMAP_CONSOLE 529 if (up->port.line == up->port.cons->index) { 530 /* Recover the break flag from console xmit */ 531 lsr |= up->lsr_break_flag; 532 } 533 #endif 534 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag); 535 } 536 537 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr) 538 { 539 unsigned char ch = 0; 540 unsigned int flag; 541 542 if (!(lsr & UART_LSR_DR)) 543 return; 544 545 ch = serial_in(up, UART_RX); 546 flag = TTY_NORMAL; 547 up->port.icount.rx++; 548 549 if (uart_handle_sysrq_char(&up->port, ch)) 550 return; 551 552 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 553 } 554 555 /** 556 * serial_omap_irq() - This handles the interrupt from one port 557 * @irq: uart port irq number 558 * @dev_id: uart port info 559 */ 560 static irqreturn_t serial_omap_irq(int irq, void *dev_id) 561 { 562 struct uart_omap_port *up = dev_id; 563 unsigned int iir, lsr; 564 unsigned int type; 565 irqreturn_t ret = IRQ_NONE; 566 int max_count = 256; 567 568 spin_lock(&up->port.lock); 569 pm_runtime_get_sync(up->dev); 570 571 do { 572 iir = serial_in(up, UART_IIR); 573 if (iir & UART_IIR_NO_INT) 574 break; 575 576 ret = IRQ_HANDLED; 577 lsr = serial_in(up, UART_LSR); 578 579 /* extract IRQ type from IIR register */ 580 type = iir & 0x3e; 581 582 switch (type) { 583 case UART_IIR_MSI: 584 check_modem_status(up); 585 break; 586 case UART_IIR_THRI: 587 transmit_chars(up, lsr); 588 break; 589 case UART_IIR_RX_TIMEOUT: 590 /* FALLTHROUGH */ 591 case UART_IIR_RDI: 592 serial_omap_rdi(up, lsr); 593 break; 594 case UART_IIR_RLSI: 595 serial_omap_rlsi(up, lsr); 596 break; 597 case UART_IIR_CTS_RTS_DSR: 598 /* simply try again */ 599 break; 600 case UART_IIR_XOFF: 601 /* FALLTHROUGH */ 602 default: 603 break; 604 } 605 } while (max_count--); 606 607 spin_unlock(&up->port.lock); 608 609 tty_flip_buffer_push(&up->port.state->port); 610 611 pm_runtime_mark_last_busy(up->dev); 612 pm_runtime_put_autosuspend(up->dev); 613 up->port_activity = jiffies; 614 615 return ret; 616 } 617 618 static unsigned int serial_omap_tx_empty(struct uart_port *port) 619 { 620 struct uart_omap_port *up = to_uart_omap_port(port); 621 unsigned long flags = 0; 622 unsigned int ret = 0; 623 624 pm_runtime_get_sync(up->dev); 625 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); 626 spin_lock_irqsave(&up->port.lock, flags); 627 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 628 spin_unlock_irqrestore(&up->port.lock, flags); 629 pm_runtime_mark_last_busy(up->dev); 630 pm_runtime_put_autosuspend(up->dev); 631 return ret; 632 } 633 634 static unsigned int serial_omap_get_mctrl(struct uart_port *port) 635 { 636 struct uart_omap_port *up = to_uart_omap_port(port); 637 unsigned int status; 638 unsigned int ret = 0; 639 640 pm_runtime_get_sync(up->dev); 641 status = check_modem_status(up); 642 pm_runtime_mark_last_busy(up->dev); 643 pm_runtime_put_autosuspend(up->dev); 644 645 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); 646 647 if (status & UART_MSR_DCD) 648 ret |= TIOCM_CAR; 649 if (status & UART_MSR_RI) 650 ret |= TIOCM_RNG; 651 if (status & UART_MSR_DSR) 652 ret |= TIOCM_DSR; 653 if (status & UART_MSR_CTS) 654 ret |= TIOCM_CTS; 655 return ret; 656 } 657 658 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 659 { 660 struct uart_omap_port *up = to_uart_omap_port(port); 661 unsigned char mcr = 0, old_mcr, lcr; 662 663 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); 664 if (mctrl & TIOCM_RTS) 665 mcr |= UART_MCR_RTS; 666 if (mctrl & TIOCM_DTR) 667 mcr |= UART_MCR_DTR; 668 if (mctrl & TIOCM_OUT1) 669 mcr |= UART_MCR_OUT1; 670 if (mctrl & TIOCM_OUT2) 671 mcr |= UART_MCR_OUT2; 672 if (mctrl & TIOCM_LOOP) 673 mcr |= UART_MCR_LOOP; 674 675 pm_runtime_get_sync(up->dev); 676 old_mcr = serial_in(up, UART_MCR); 677 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 | 678 UART_MCR_DTR | UART_MCR_RTS); 679 up->mcr = old_mcr | mcr; 680 serial_out(up, UART_MCR, up->mcr); 681 682 /* Turn off autoRTS if RTS is lowered; restore autoRTS if RTS raised */ 683 lcr = serial_in(up, UART_LCR); 684 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 685 if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS)) 686 up->efr |= UART_EFR_RTS; 687 else 688 up->efr &= ~UART_EFR_RTS; 689 serial_out(up, UART_EFR, up->efr); 690 serial_out(up, UART_LCR, lcr); 691 692 pm_runtime_mark_last_busy(up->dev); 693 pm_runtime_put_autosuspend(up->dev); 694 } 695 696 static void serial_omap_break_ctl(struct uart_port *port, int break_state) 697 { 698 struct uart_omap_port *up = to_uart_omap_port(port); 699 unsigned long flags = 0; 700 701 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); 702 pm_runtime_get_sync(up->dev); 703 spin_lock_irqsave(&up->port.lock, flags); 704 if (break_state == -1) 705 up->lcr |= UART_LCR_SBC; 706 else 707 up->lcr &= ~UART_LCR_SBC; 708 serial_out(up, UART_LCR, up->lcr); 709 spin_unlock_irqrestore(&up->port.lock, flags); 710 pm_runtime_mark_last_busy(up->dev); 711 pm_runtime_put_autosuspend(up->dev); 712 } 713 714 static int serial_omap_startup(struct uart_port *port) 715 { 716 struct uart_omap_port *up = to_uart_omap_port(port); 717 unsigned long flags = 0; 718 int retval; 719 720 /* 721 * Allocate the IRQ 722 */ 723 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 724 up->name, up); 725 if (retval) 726 return retval; 727 728 /* Optional wake-up IRQ */ 729 if (up->wakeirq) { 730 retval = dev_pm_set_dedicated_wake_irq(up->dev, up->wakeirq); 731 if (retval) { 732 free_irq(up->port.irq, up); 733 return retval; 734 } 735 } 736 737 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); 738 739 pm_runtime_get_sync(up->dev); 740 /* 741 * Clear the FIFO buffers and disable them. 742 * (they will be reenabled in set_termios()) 743 */ 744 serial_omap_clear_fifos(up); 745 746 /* 747 * Clear the interrupt registers. 748 */ 749 (void) serial_in(up, UART_LSR); 750 if (serial_in(up, UART_LSR) & UART_LSR_DR) 751 (void) serial_in(up, UART_RX); 752 (void) serial_in(up, UART_IIR); 753 (void) serial_in(up, UART_MSR); 754 755 /* 756 * Now, initialize the UART 757 */ 758 serial_out(up, UART_LCR, UART_LCR_WLEN8); 759 spin_lock_irqsave(&up->port.lock, flags); 760 /* 761 * Most PC uarts need OUT2 raised to enable interrupts. 762 */ 763 up->port.mctrl |= TIOCM_OUT2; 764 serial_omap_set_mctrl(&up->port, up->port.mctrl); 765 spin_unlock_irqrestore(&up->port.lock, flags); 766 767 up->msr_saved_flags = 0; 768 /* 769 * Finally, enable interrupts. Note: Modem status interrupts 770 * are set via set_termios(), which will be occurring imminently 771 * anyway, so we don't enable them here. 772 */ 773 up->ier = UART_IER_RLSI | UART_IER_RDI; 774 serial_out(up, UART_IER, up->ier); 775 776 /* Enable module level wake up */ 777 up->wer = OMAP_UART_WER_MOD_WKUP; 778 if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP) 779 up->wer |= OMAP_UART_TX_WAKEUP_EN; 780 781 serial_out(up, UART_OMAP_WER, up->wer); 782 783 pm_runtime_mark_last_busy(up->dev); 784 pm_runtime_put_autosuspend(up->dev); 785 up->port_activity = jiffies; 786 return 0; 787 } 788 789 static void serial_omap_shutdown(struct uart_port *port) 790 { 791 struct uart_omap_port *up = to_uart_omap_port(port); 792 unsigned long flags = 0; 793 794 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line); 795 796 pm_runtime_get_sync(up->dev); 797 /* 798 * Disable interrupts from this port 799 */ 800 up->ier = 0; 801 serial_out(up, UART_IER, 0); 802 803 spin_lock_irqsave(&up->port.lock, flags); 804 up->port.mctrl &= ~TIOCM_OUT2; 805 serial_omap_set_mctrl(&up->port, up->port.mctrl); 806 spin_unlock_irqrestore(&up->port.lock, flags); 807 808 /* 809 * Disable break condition and FIFOs 810 */ 811 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 812 serial_omap_clear_fifos(up); 813 814 /* 815 * Read data port to reset things, and then free the irq 816 */ 817 if (serial_in(up, UART_LSR) & UART_LSR_DR) 818 (void) serial_in(up, UART_RX); 819 820 pm_runtime_mark_last_busy(up->dev); 821 pm_runtime_put_autosuspend(up->dev); 822 free_irq(up->port.irq, up); 823 dev_pm_clear_wake_irq(up->dev); 824 } 825 826 static void serial_omap_uart_qos_work(struct work_struct *work) 827 { 828 struct uart_omap_port *up = container_of(work, struct uart_omap_port, 829 qos_work); 830 831 cpu_latency_qos_update_request(&up->pm_qos_request, up->latency); 832 } 833 834 static void 835 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 836 struct ktermios *old) 837 { 838 struct uart_omap_port *up = to_uart_omap_port(port); 839 unsigned char cval = 0; 840 unsigned long flags = 0; 841 unsigned int baud, quot; 842 843 switch (termios->c_cflag & CSIZE) { 844 case CS5: 845 cval = UART_LCR_WLEN5; 846 break; 847 case CS6: 848 cval = UART_LCR_WLEN6; 849 break; 850 case CS7: 851 cval = UART_LCR_WLEN7; 852 break; 853 default: 854 case CS8: 855 cval = UART_LCR_WLEN8; 856 break; 857 } 858 859 if (termios->c_cflag & CSTOPB) 860 cval |= UART_LCR_STOP; 861 if (termios->c_cflag & PARENB) 862 cval |= UART_LCR_PARITY; 863 if (!(termios->c_cflag & PARODD)) 864 cval |= UART_LCR_EPAR; 865 if (termios->c_cflag & CMSPAR) 866 cval |= UART_LCR_SPAR; 867 868 /* 869 * Ask the core to calculate the divisor for us. 870 */ 871 872 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 873 quot = serial_omap_get_divisor(port, baud); 874 875 /* calculate wakeup latency constraint */ 876 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8); 877 up->latency = up->calc_latency; 878 schedule_work(&up->qos_work); 879 880 up->dll = quot & 0xff; 881 up->dlh = quot >> 8; 882 up->mdr1 = UART_OMAP_MDR1_DISABLE; 883 884 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 885 UART_FCR_ENABLE_FIFO; 886 887 /* 888 * Ok, we're now changing the port state. Do it with 889 * interrupts disabled. 890 */ 891 pm_runtime_get_sync(up->dev); 892 spin_lock_irqsave(&up->port.lock, flags); 893 894 /* 895 * Update the per-port timeout. 896 */ 897 uart_update_timeout(port, termios->c_cflag, baud); 898 899 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 900 if (termios->c_iflag & INPCK) 901 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 902 if (termios->c_iflag & (BRKINT | PARMRK)) 903 up->port.read_status_mask |= UART_LSR_BI; 904 905 /* 906 * Characters to ignore 907 */ 908 up->port.ignore_status_mask = 0; 909 if (termios->c_iflag & IGNPAR) 910 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 911 if (termios->c_iflag & IGNBRK) { 912 up->port.ignore_status_mask |= UART_LSR_BI; 913 /* 914 * If we're ignoring parity and break indicators, 915 * ignore overruns too (for real raw support). 916 */ 917 if (termios->c_iflag & IGNPAR) 918 up->port.ignore_status_mask |= UART_LSR_OE; 919 } 920 921 /* 922 * ignore all characters if CREAD is not set 923 */ 924 if ((termios->c_cflag & CREAD) == 0) 925 up->port.ignore_status_mask |= UART_LSR_DR; 926 927 /* 928 * Modem status interrupts 929 */ 930 up->ier &= ~UART_IER_MSI; 931 if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 932 up->ier |= UART_IER_MSI; 933 serial_out(up, UART_IER, up->ier); 934 serial_out(up, UART_LCR, cval); /* reset DLAB */ 935 up->lcr = cval; 936 up->scr = 0; 937 938 /* FIFOs and DMA Settings */ 939 940 /* FCR can be changed only when the 941 * baud clock is not running 942 * DLL_REG and DLH_REG set to 0. 943 */ 944 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 945 serial_out(up, UART_DLL, 0); 946 serial_out(up, UART_DLM, 0); 947 serial_out(up, UART_LCR, 0); 948 949 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 950 951 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB; 952 up->efr &= ~UART_EFR_SCD; 953 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 954 955 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 956 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR; 957 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 958 /* FIFO ENABLE, DMA MODE */ 959 960 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK; 961 /* 962 * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK 963 * sets Enables the granularity of 1 for TRIGGER RX 964 * level. Along with setting RX FIFO trigger level 965 * to 1 (as noted below, 16 characters) and TLR[3:0] 966 * to zero this will result RX FIFO threshold level 967 * to 1 character, instead of 16 as noted in comment 968 * below. 969 */ 970 971 /* Set receive FIFO threshold to 16 characters and 972 * transmit FIFO threshold to 32 spaces 973 */ 974 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK; 975 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK; 976 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 | 977 UART_FCR_ENABLE_FIFO; 978 979 serial_out(up, UART_FCR, up->fcr); 980 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 981 982 serial_out(up, UART_OMAP_SCR, up->scr); 983 984 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */ 985 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 986 serial_out(up, UART_MCR, up->mcr); 987 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 988 serial_out(up, UART_EFR, up->efr); 989 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 990 991 /* Protocol, Baud Rate, and Interrupt Settings */ 992 993 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 994 serial_omap_mdr1_errataset(up, up->mdr1); 995 else 996 serial_out(up, UART_OMAP_MDR1, up->mdr1); 997 998 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 999 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 1000 1001 serial_out(up, UART_LCR, 0); 1002 serial_out(up, UART_IER, 0); 1003 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1004 1005 serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 1006 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 1007 1008 serial_out(up, UART_LCR, 0); 1009 serial_out(up, UART_IER, up->ier); 1010 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1011 1012 serial_out(up, UART_EFR, up->efr); 1013 serial_out(up, UART_LCR, cval); 1014 1015 if (!serial_omap_baud_is_mode16(port, baud)) 1016 up->mdr1 = UART_OMAP_MDR1_13X_MODE; 1017 else 1018 up->mdr1 = UART_OMAP_MDR1_16X_MODE; 1019 1020 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1021 serial_omap_mdr1_errataset(up, up->mdr1); 1022 else 1023 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1024 1025 /* Configure flow control */ 1026 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1027 1028 /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */ 1029 serial_out(up, UART_XON1, termios->c_cc[VSTART]); 1030 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 1031 1032 /* Enable access to TCR/TLR */ 1033 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 1034 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1035 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 1036 1037 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 1038 1039 up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); 1040 1041 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) { 1042 /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */ 1043 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; 1044 up->efr |= UART_EFR_CTS; 1045 } else { 1046 /* Disable AUTORTS and AUTOCTS */ 1047 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS); 1048 } 1049 1050 if (up->port.flags & UPF_SOFT_FLOW) { 1051 /* clear SW control mode bits */ 1052 up->efr &= OMAP_UART_SW_CLR; 1053 1054 /* 1055 * IXON Flag: 1056 * Enable XON/XOFF flow control on input. 1057 * Receiver compares XON1, XOFF1. 1058 */ 1059 if (termios->c_iflag & IXON) 1060 up->efr |= OMAP_UART_SW_RX; 1061 1062 /* 1063 * IXOFF Flag: 1064 * Enable XON/XOFF flow control on output. 1065 * Transmit XON1, XOFF1 1066 */ 1067 if (termios->c_iflag & IXOFF) { 1068 up->port.status |= UPSTAT_AUTOXOFF; 1069 up->efr |= OMAP_UART_SW_TX; 1070 } 1071 1072 /* 1073 * IXANY Flag: 1074 * Enable any character to restart output. 1075 * Operation resumes after receiving any 1076 * character after recognition of the XOFF character 1077 */ 1078 if (termios->c_iflag & IXANY) 1079 up->mcr |= UART_MCR_XONANY; 1080 else 1081 up->mcr &= ~UART_MCR_XONANY; 1082 } 1083 serial_out(up, UART_MCR, up->mcr); 1084 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1085 serial_out(up, UART_EFR, up->efr); 1086 serial_out(up, UART_LCR, up->lcr); 1087 1088 serial_omap_set_mctrl(&up->port, up->port.mctrl); 1089 1090 spin_unlock_irqrestore(&up->port.lock, flags); 1091 pm_runtime_mark_last_busy(up->dev); 1092 pm_runtime_put_autosuspend(up->dev); 1093 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); 1094 } 1095 1096 static void 1097 serial_omap_pm(struct uart_port *port, unsigned int state, 1098 unsigned int oldstate) 1099 { 1100 struct uart_omap_port *up = to_uart_omap_port(port); 1101 unsigned char efr; 1102 1103 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); 1104 1105 pm_runtime_get_sync(up->dev); 1106 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1107 efr = serial_in(up, UART_EFR); 1108 serial_out(up, UART_EFR, efr | UART_EFR_ECB); 1109 serial_out(up, UART_LCR, 0); 1110 1111 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 1112 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1113 serial_out(up, UART_EFR, efr); 1114 serial_out(up, UART_LCR, 0); 1115 1116 pm_runtime_mark_last_busy(up->dev); 1117 pm_runtime_put_autosuspend(up->dev); 1118 } 1119 1120 static void serial_omap_release_port(struct uart_port *port) 1121 { 1122 dev_dbg(port->dev, "serial_omap_release_port+\n"); 1123 } 1124 1125 static int serial_omap_request_port(struct uart_port *port) 1126 { 1127 dev_dbg(port->dev, "serial_omap_request_port+\n"); 1128 return 0; 1129 } 1130 1131 static void serial_omap_config_port(struct uart_port *port, int flags) 1132 { 1133 struct uart_omap_port *up = to_uart_omap_port(port); 1134 1135 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 1136 up->port.line); 1137 up->port.type = PORT_OMAP; 1138 up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW; 1139 } 1140 1141 static int 1142 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 1143 { 1144 /* we don't want the core code to modify any port params */ 1145 dev_dbg(port->dev, "serial_omap_verify_port+\n"); 1146 return -EINVAL; 1147 } 1148 1149 static const char * 1150 serial_omap_type(struct uart_port *port) 1151 { 1152 struct uart_omap_port *up = to_uart_omap_port(port); 1153 1154 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line); 1155 return up->name; 1156 } 1157 1158 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 1159 1160 static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up) 1161 { 1162 unsigned int status, tmout = 10000; 1163 1164 /* Wait up to 10ms for the character(s) to be sent. */ 1165 do { 1166 status = serial_in(up, UART_LSR); 1167 1168 if (status & UART_LSR_BI) 1169 up->lsr_break_flag = UART_LSR_BI; 1170 1171 if (--tmout == 0) 1172 break; 1173 udelay(1); 1174 } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 1175 1176 /* Wait up to 1s for flow control if necessary */ 1177 if (up->port.flags & UPF_CONS_FLOW) { 1178 tmout = 1000000; 1179 for (tmout = 1000000; tmout; tmout--) { 1180 unsigned int msr = serial_in(up, UART_MSR); 1181 1182 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 1183 if (msr & UART_MSR_CTS) 1184 break; 1185 1186 udelay(1); 1187 } 1188 } 1189 } 1190 1191 #ifdef CONFIG_CONSOLE_POLL 1192 1193 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 1194 { 1195 struct uart_omap_port *up = to_uart_omap_port(port); 1196 1197 pm_runtime_get_sync(up->dev); 1198 wait_for_xmitr(up); 1199 serial_out(up, UART_TX, ch); 1200 pm_runtime_mark_last_busy(up->dev); 1201 pm_runtime_put_autosuspend(up->dev); 1202 } 1203 1204 static int serial_omap_poll_get_char(struct uart_port *port) 1205 { 1206 struct uart_omap_port *up = to_uart_omap_port(port); 1207 unsigned int status; 1208 1209 pm_runtime_get_sync(up->dev); 1210 status = serial_in(up, UART_LSR); 1211 if (!(status & UART_LSR_DR)) { 1212 status = NO_POLL_CHAR; 1213 goto out; 1214 } 1215 1216 status = serial_in(up, UART_RX); 1217 1218 out: 1219 pm_runtime_mark_last_busy(up->dev); 1220 pm_runtime_put_autosuspend(up->dev); 1221 1222 return status; 1223 } 1224 1225 #endif /* CONFIG_CONSOLE_POLL */ 1226 1227 #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1228 1229 #ifdef CONFIG_SERIAL_EARLYCON 1230 static unsigned int omap_serial_early_in(struct uart_port *port, int offset) 1231 { 1232 offset <<= port->regshift; 1233 return readw(port->membase + offset); 1234 } 1235 1236 static void omap_serial_early_out(struct uart_port *port, int offset, 1237 int value) 1238 { 1239 offset <<= port->regshift; 1240 writew(value, port->membase + offset); 1241 } 1242 1243 static void omap_serial_early_putc(struct uart_port *port, int c) 1244 { 1245 unsigned int status; 1246 1247 for (;;) { 1248 status = omap_serial_early_in(port, UART_LSR); 1249 if ((status & BOTH_EMPTY) == BOTH_EMPTY) 1250 break; 1251 cpu_relax(); 1252 } 1253 omap_serial_early_out(port, UART_TX, c); 1254 } 1255 1256 static void early_omap_serial_write(struct console *console, const char *s, 1257 unsigned int count) 1258 { 1259 struct earlycon_device *device = console->data; 1260 struct uart_port *port = &device->port; 1261 1262 uart_console_write(port, s, count, omap_serial_early_putc); 1263 } 1264 1265 static int __init early_omap_serial_setup(struct earlycon_device *device, 1266 const char *options) 1267 { 1268 struct uart_port *port = &device->port; 1269 1270 if (!(device->port.membase || device->port.iobase)) 1271 return -ENODEV; 1272 1273 port->regshift = 2; 1274 device->con->write = early_omap_serial_write; 1275 return 0; 1276 } 1277 1278 OF_EARLYCON_DECLARE(omapserial, "ti,omap2-uart", early_omap_serial_setup); 1279 OF_EARLYCON_DECLARE(omapserial, "ti,omap3-uart", early_omap_serial_setup); 1280 OF_EARLYCON_DECLARE(omapserial, "ti,omap4-uart", early_omap_serial_setup); 1281 #endif /* CONFIG_SERIAL_EARLYCON */ 1282 1283 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS]; 1284 1285 static struct uart_driver serial_omap_reg; 1286 1287 static void serial_omap_console_putchar(struct uart_port *port, int ch) 1288 { 1289 struct uart_omap_port *up = to_uart_omap_port(port); 1290 1291 wait_for_xmitr(up); 1292 serial_out(up, UART_TX, ch); 1293 } 1294 1295 static void 1296 serial_omap_console_write(struct console *co, const char *s, 1297 unsigned int count) 1298 { 1299 struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1300 unsigned long flags; 1301 unsigned int ier; 1302 int locked = 1; 1303 1304 pm_runtime_get_sync(up->dev); 1305 1306 local_irq_save(flags); 1307 if (up->port.sysrq) 1308 locked = 0; 1309 else if (oops_in_progress) 1310 locked = spin_trylock(&up->port.lock); 1311 else 1312 spin_lock(&up->port.lock); 1313 1314 /* 1315 * First save the IER then disable the interrupts 1316 */ 1317 ier = serial_in(up, UART_IER); 1318 serial_out(up, UART_IER, 0); 1319 1320 uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1321 1322 /* 1323 * Finally, wait for transmitter to become empty 1324 * and restore the IER 1325 */ 1326 wait_for_xmitr(up); 1327 serial_out(up, UART_IER, ier); 1328 /* 1329 * The receive handling will happen properly because the 1330 * receive ready bit will still be set; it is not cleared 1331 * on read. However, modem control will not, we must 1332 * call it if we have saved something in the saved flags 1333 * while processing with interrupts off. 1334 */ 1335 if (up->msr_saved_flags) 1336 check_modem_status(up); 1337 1338 pm_runtime_mark_last_busy(up->dev); 1339 pm_runtime_put_autosuspend(up->dev); 1340 if (locked) 1341 spin_unlock(&up->port.lock); 1342 local_irq_restore(flags); 1343 } 1344 1345 static int __init 1346 serial_omap_console_setup(struct console *co, char *options) 1347 { 1348 struct uart_omap_port *up; 1349 int baud = 115200; 1350 int bits = 8; 1351 int parity = 'n'; 1352 int flow = 'n'; 1353 1354 if (serial_omap_console_ports[co->index] == NULL) 1355 return -ENODEV; 1356 up = serial_omap_console_ports[co->index]; 1357 1358 if (options) 1359 uart_parse_options(options, &baud, &parity, &bits, &flow); 1360 1361 return uart_set_options(&up->port, co, baud, parity, bits, flow); 1362 } 1363 1364 static struct console serial_omap_console = { 1365 .name = OMAP_SERIAL_NAME, 1366 .write = serial_omap_console_write, 1367 .device = uart_console_device, 1368 .setup = serial_omap_console_setup, 1369 .flags = CON_PRINTBUFFER, 1370 .index = -1, 1371 .data = &serial_omap_reg, 1372 }; 1373 1374 static void serial_omap_add_console_port(struct uart_omap_port *up) 1375 { 1376 serial_omap_console_ports[up->port.line] = up; 1377 } 1378 1379 #define OMAP_CONSOLE (&serial_omap_console) 1380 1381 #else 1382 1383 #define OMAP_CONSOLE NULL 1384 1385 static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1386 {} 1387 1388 #endif 1389 1390 /* Enable or disable the rs485 support */ 1391 static int 1392 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485) 1393 { 1394 struct uart_omap_port *up = to_uart_omap_port(port); 1395 unsigned int mode; 1396 int val; 1397 1398 pm_runtime_get_sync(up->dev); 1399 1400 /* Disable interrupts from this port */ 1401 mode = up->ier; 1402 up->ier = 0; 1403 serial_out(up, UART_IER, 0); 1404 1405 /* Clamp the delays to [0, 100ms] */ 1406 rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U); 1407 rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U); 1408 1409 /* store new config */ 1410 port->rs485 = *rs485; 1411 1412 /* 1413 * Just as a precaution, only allow rs485 1414 * to be enabled if the gpio pin is valid 1415 */ 1416 if (up->rts_gpiod) { 1417 /* enable / disable rts */ 1418 val = (port->rs485.flags & SER_RS485_ENABLED) ? 1419 SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND; 1420 val = (port->rs485.flags & val) ? 1 : 0; 1421 gpiod_set_value(up->rts_gpiod, val); 1422 } else 1423 port->rs485.flags &= ~SER_RS485_ENABLED; 1424 1425 /* Enable interrupts */ 1426 up->ier = mode; 1427 serial_out(up, UART_IER, up->ier); 1428 1429 /* If RS-485 is disabled, make sure the THR interrupt is fired when 1430 * TX FIFO is below the trigger level. 1431 */ 1432 if (!(port->rs485.flags & SER_RS485_ENABLED) && 1433 (up->scr & OMAP_UART_SCR_TX_EMPTY)) { 1434 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 1435 serial_out(up, UART_OMAP_SCR, up->scr); 1436 } 1437 1438 pm_runtime_mark_last_busy(up->dev); 1439 pm_runtime_put_autosuspend(up->dev); 1440 1441 return 0; 1442 } 1443 1444 static const struct uart_ops serial_omap_pops = { 1445 .tx_empty = serial_omap_tx_empty, 1446 .set_mctrl = serial_omap_set_mctrl, 1447 .get_mctrl = serial_omap_get_mctrl, 1448 .stop_tx = serial_omap_stop_tx, 1449 .start_tx = serial_omap_start_tx, 1450 .throttle = serial_omap_throttle, 1451 .unthrottle = serial_omap_unthrottle, 1452 .stop_rx = serial_omap_stop_rx, 1453 .enable_ms = serial_omap_enable_ms, 1454 .break_ctl = serial_omap_break_ctl, 1455 .startup = serial_omap_startup, 1456 .shutdown = serial_omap_shutdown, 1457 .set_termios = serial_omap_set_termios, 1458 .pm = serial_omap_pm, 1459 .type = serial_omap_type, 1460 .release_port = serial_omap_release_port, 1461 .request_port = serial_omap_request_port, 1462 .config_port = serial_omap_config_port, 1463 .verify_port = serial_omap_verify_port, 1464 #ifdef CONFIG_CONSOLE_POLL 1465 .poll_put_char = serial_omap_poll_put_char, 1466 .poll_get_char = serial_omap_poll_get_char, 1467 #endif 1468 }; 1469 1470 static struct uart_driver serial_omap_reg = { 1471 .owner = THIS_MODULE, 1472 .driver_name = "OMAP-SERIAL", 1473 .dev_name = OMAP_SERIAL_NAME, 1474 .nr = OMAP_MAX_HSUART_PORTS, 1475 .cons = OMAP_CONSOLE, 1476 }; 1477 1478 #ifdef CONFIG_PM_SLEEP 1479 static int serial_omap_prepare(struct device *dev) 1480 { 1481 struct uart_omap_port *up = dev_get_drvdata(dev); 1482 1483 up->is_suspending = true; 1484 1485 return 0; 1486 } 1487 1488 static void serial_omap_complete(struct device *dev) 1489 { 1490 struct uart_omap_port *up = dev_get_drvdata(dev); 1491 1492 up->is_suspending = false; 1493 } 1494 1495 static int serial_omap_suspend(struct device *dev) 1496 { 1497 struct uart_omap_port *up = dev_get_drvdata(dev); 1498 1499 uart_suspend_port(&serial_omap_reg, &up->port); 1500 flush_work(&up->qos_work); 1501 1502 if (device_may_wakeup(dev)) 1503 serial_omap_enable_wakeup(up, true); 1504 else 1505 serial_omap_enable_wakeup(up, false); 1506 1507 return 0; 1508 } 1509 1510 static int serial_omap_resume(struct device *dev) 1511 { 1512 struct uart_omap_port *up = dev_get_drvdata(dev); 1513 1514 if (device_may_wakeup(dev)) 1515 serial_omap_enable_wakeup(up, false); 1516 1517 uart_resume_port(&serial_omap_reg, &up->port); 1518 1519 return 0; 1520 } 1521 #else 1522 #define serial_omap_prepare NULL 1523 #define serial_omap_complete NULL 1524 #endif /* CONFIG_PM_SLEEP */ 1525 1526 static void omap_serial_fill_features_erratas(struct uart_omap_port *up) 1527 { 1528 u32 mvr, scheme; 1529 u16 revision, major, minor; 1530 1531 mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift)); 1532 1533 /* Check revision register scheme */ 1534 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT; 1535 1536 switch (scheme) { 1537 case 0: /* Legacy Scheme: OMAP2/3 */ 1538 /* MINOR_REV[0:4], MAJOR_REV[4:7] */ 1539 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >> 1540 OMAP_UART_LEGACY_MVR_MAJ_SHIFT; 1541 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK); 1542 break; 1543 case 1: 1544 /* New Scheme: OMAP4+ */ 1545 /* MINOR_REV[0:5], MAJOR_REV[8:10] */ 1546 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >> 1547 OMAP_UART_MVR_MAJ_SHIFT; 1548 minor = (mvr & OMAP_UART_MVR_MIN_MASK); 1549 break; 1550 default: 1551 dev_warn(up->dev, 1552 "Unknown %s revision, defaulting to highest\n", 1553 up->name); 1554 /* highest possible revision */ 1555 major = 0xff; 1556 minor = 0xff; 1557 } 1558 1559 /* normalize revision for the driver */ 1560 revision = UART_BUILD_REVISION(major, minor); 1561 1562 switch (revision) { 1563 case OMAP_UART_REV_46: 1564 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | 1565 UART_ERRATA_i291_DMA_FORCEIDLE); 1566 break; 1567 case OMAP_UART_REV_52: 1568 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | 1569 UART_ERRATA_i291_DMA_FORCEIDLE); 1570 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP; 1571 break; 1572 case OMAP_UART_REV_63: 1573 up->errata |= UART_ERRATA_i202_MDR1_ACCESS; 1574 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP; 1575 break; 1576 default: 1577 break; 1578 } 1579 } 1580 1581 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev) 1582 { 1583 struct omap_uart_port_info *omap_up_info; 1584 1585 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL); 1586 if (!omap_up_info) 1587 return NULL; /* out of memory */ 1588 1589 of_property_read_u32(dev->of_node, "clock-frequency", 1590 &omap_up_info->uartclk); 1591 1592 omap_up_info->flags = UPF_BOOT_AUTOCONF; 1593 1594 return omap_up_info; 1595 } 1596 1597 static int serial_omap_probe_rs485(struct uart_omap_port *up, 1598 struct device *dev) 1599 { 1600 struct serial_rs485 *rs485conf = &up->port.rs485; 1601 struct device_node *np = dev->of_node; 1602 enum gpiod_flags gflags; 1603 int ret; 1604 1605 rs485conf->flags = 0; 1606 up->rts_gpiod = NULL; 1607 1608 if (!np) 1609 return 0; 1610 1611 uart_get_rs485_mode(up->dev, rs485conf); 1612 1613 if (of_property_read_bool(np, "rs485-rts-active-high")) { 1614 rs485conf->flags |= SER_RS485_RTS_ON_SEND; 1615 rs485conf->flags &= ~SER_RS485_RTS_AFTER_SEND; 1616 } else { 1617 rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 1618 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 1619 } 1620 1621 /* check for tx enable gpio */ 1622 gflags = rs485conf->flags & SER_RS485_RTS_AFTER_SEND ? 1623 GPIOD_OUT_HIGH : GPIOD_OUT_LOW; 1624 up->rts_gpiod = devm_gpiod_get_optional(dev, "rts", gflags); 1625 if (IS_ERR(up->rts_gpiod)) { 1626 ret = PTR_ERR(up->rts_gpiod); 1627 if (ret == -EPROBE_DEFER) 1628 return ret; 1629 /* 1630 * FIXME: the code historically ignored any other error than 1631 * -EPROBE_DEFER and just went on without GPIO. 1632 */ 1633 up->rts_gpiod = NULL; 1634 } else { 1635 gpiod_set_consumer_name(up->rts_gpiod, "omap-serial"); 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); 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_LATENCY_DEFAULT_VALUE; 1726 up->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; 1727 cpu_latency_qos_add_request(&up->pm_qos_request, up->latency); 1728 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); 1729 1730 platform_set_drvdata(pdev, up); 1731 if (omap_up_info->autosuspend_timeout == 0) 1732 omap_up_info->autosuspend_timeout = -1; 1733 1734 device_init_wakeup(up->dev, true); 1735 pm_runtime_use_autosuspend(&pdev->dev); 1736 pm_runtime_set_autosuspend_delay(&pdev->dev, 1737 omap_up_info->autosuspend_timeout); 1738 1739 pm_runtime_irq_safe(&pdev->dev); 1740 pm_runtime_enable(&pdev->dev); 1741 1742 pm_runtime_get_sync(&pdev->dev); 1743 1744 omap_serial_fill_features_erratas(up); 1745 1746 ui[up->port.line] = up; 1747 serial_omap_add_console_port(up); 1748 1749 ret = uart_add_one_port(&serial_omap_reg, &up->port); 1750 if (ret != 0) 1751 goto err_add_port; 1752 1753 pm_runtime_mark_last_busy(up->dev); 1754 pm_runtime_put_autosuspend(up->dev); 1755 return 0; 1756 1757 err_add_port: 1758 pm_runtime_dont_use_autosuspend(&pdev->dev); 1759 pm_runtime_put_sync(&pdev->dev); 1760 pm_runtime_disable(&pdev->dev); 1761 cpu_latency_qos_remove_request(&up->pm_qos_request); 1762 device_init_wakeup(up->dev, false); 1763 err_rs485: 1764 err_port_line: 1765 return ret; 1766 } 1767 1768 static int serial_omap_remove(struct platform_device *dev) 1769 { 1770 struct uart_omap_port *up = platform_get_drvdata(dev); 1771 1772 pm_runtime_get_sync(up->dev); 1773 1774 uart_remove_one_port(&serial_omap_reg, &up->port); 1775 1776 pm_runtime_dont_use_autosuspend(up->dev); 1777 pm_runtime_put_sync(up->dev); 1778 pm_runtime_disable(up->dev); 1779 cpu_latency_qos_remove_request(&up->pm_qos_request); 1780 device_init_wakeup(&dev->dev, false); 1781 1782 return 0; 1783 } 1784 1785 /* 1786 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 1787 * The access to uart register after MDR1 Access 1788 * causes UART to corrupt data. 1789 * 1790 * Need a delay = 1791 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 1792 * give 10 times as much 1793 */ 1794 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 1795 { 1796 u8 timeout = 255; 1797 1798 serial_out(up, UART_OMAP_MDR1, mdr1); 1799 udelay(2); 1800 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 1801 UART_FCR_CLEAR_RCVR); 1802 /* 1803 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 1804 * TX_FIFO_E bit is 1. 1805 */ 1806 while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 1807 (UART_LSR_THRE | UART_LSR_DR))) { 1808 timeout--; 1809 if (!timeout) { 1810 /* Should *never* happen. we warn and carry on */ 1811 dev_crit(up->dev, "Errata i202: timedout %x\n", 1812 serial_in(up, UART_LSR)); 1813 break; 1814 } 1815 udelay(1); 1816 } 1817 } 1818 1819 #ifdef CONFIG_PM 1820 static void serial_omap_restore_context(struct uart_omap_port *up) 1821 { 1822 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1823 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 1824 else 1825 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 1826 1827 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1828 serial_out(up, UART_EFR, UART_EFR_ECB); 1829 serial_out(up, UART_LCR, 0x0); /* Operational mode */ 1830 serial_out(up, UART_IER, 0x0); 1831 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1832 serial_out(up, UART_DLL, up->dll); 1833 serial_out(up, UART_DLM, up->dlh); 1834 serial_out(up, UART_LCR, 0x0); /* Operational mode */ 1835 serial_out(up, UART_IER, up->ier); 1836 serial_out(up, UART_FCR, up->fcr); 1837 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1838 serial_out(up, UART_MCR, up->mcr); 1839 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1840 serial_out(up, UART_OMAP_SCR, up->scr); 1841 serial_out(up, UART_EFR, up->efr); 1842 serial_out(up, UART_LCR, up->lcr); 1843 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1844 serial_omap_mdr1_errataset(up, up->mdr1); 1845 else 1846 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1847 serial_out(up, UART_OMAP_WER, up->wer); 1848 } 1849 1850 static int serial_omap_runtime_suspend(struct device *dev) 1851 { 1852 struct uart_omap_port *up = dev_get_drvdata(dev); 1853 1854 if (!up) 1855 return -EINVAL; 1856 1857 /* 1858 * When using 'no_console_suspend', the console UART must not be 1859 * suspended. Since driver suspend is managed by runtime suspend, 1860 * preventing runtime suspend (by returning error) will keep device 1861 * active during suspend. 1862 */ 1863 if (up->is_suspending && !console_suspend_enabled && 1864 uart_console(&up->port)) 1865 return -EBUSY; 1866 1867 up->context_loss_cnt = serial_omap_get_context_loss_count(up); 1868 1869 serial_omap_enable_wakeup(up, true); 1870 1871 up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; 1872 schedule_work(&up->qos_work); 1873 1874 return 0; 1875 } 1876 1877 static int serial_omap_runtime_resume(struct device *dev) 1878 { 1879 struct uart_omap_port *up = dev_get_drvdata(dev); 1880 1881 int loss_cnt = serial_omap_get_context_loss_count(up); 1882 1883 serial_omap_enable_wakeup(up, false); 1884 1885 if (loss_cnt < 0) { 1886 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n", 1887 loss_cnt); 1888 serial_omap_restore_context(up); 1889 } else if (up->context_loss_cnt != loss_cnt) { 1890 serial_omap_restore_context(up); 1891 } 1892 up->latency = up->calc_latency; 1893 schedule_work(&up->qos_work); 1894 1895 return 0; 1896 } 1897 #endif 1898 1899 static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1900 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1901 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1902 serial_omap_runtime_resume, NULL) 1903 .prepare = serial_omap_prepare, 1904 .complete = serial_omap_complete, 1905 }; 1906 1907 #if defined(CONFIG_OF) 1908 static const struct of_device_id omap_serial_of_match[] = { 1909 { .compatible = "ti,omap2-uart" }, 1910 { .compatible = "ti,omap3-uart" }, 1911 { .compatible = "ti,omap4-uart" }, 1912 {}, 1913 }; 1914 MODULE_DEVICE_TABLE(of, omap_serial_of_match); 1915 #endif 1916 1917 static struct platform_driver serial_omap_driver = { 1918 .probe = serial_omap_probe, 1919 .remove = serial_omap_remove, 1920 .driver = { 1921 .name = OMAP_SERIAL_DRIVER_NAME, 1922 .pm = &serial_omap_dev_pm_ops, 1923 .of_match_table = of_match_ptr(omap_serial_of_match), 1924 }, 1925 }; 1926 1927 static int __init serial_omap_init(void) 1928 { 1929 int ret; 1930 1931 ret = uart_register_driver(&serial_omap_reg); 1932 if (ret != 0) 1933 return ret; 1934 ret = platform_driver_register(&serial_omap_driver); 1935 if (ret != 0) 1936 uart_unregister_driver(&serial_omap_reg); 1937 return ret; 1938 } 1939 1940 static void __exit serial_omap_exit(void) 1941 { 1942 platform_driver_unregister(&serial_omap_driver); 1943 uart_unregister_driver(&serial_omap_reg); 1944 } 1945 1946 module_init(serial_omap_init); 1947 module_exit(serial_omap_exit); 1948 1949 MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1950 MODULE_LICENSE("GPL"); 1951 MODULE_AUTHOR("Texas Instruments Inc"); 1952