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 #if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) 20 #define SUPPORT_SYSRQ 21 #endif 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/console.h> 26 #include <linux/serial_reg.h> 27 #include <linux/delay.h> 28 #include <linux/slab.h> 29 #include <linux/tty.h> 30 #include <linux/tty_flip.h> 31 #include <linux/platform_device.h> 32 #include <linux/io.h> 33 #include <linux/clk.h> 34 #include <linux/serial_core.h> 35 #include <linux/irq.h> 36 #include <linux/pm_runtime.h> 37 #include <linux/pm_wakeirq.h> 38 #include <linux/of.h> 39 #include <linux/of_irq.h> 40 #include <linux/gpio.h> 41 #include <linux/of_gpio.h> 42 #include <linux/platform_data/serial-omap.h> 43 44 #include <dt-bindings/gpio/gpio.h> 45 46 #define OMAP_MAX_HSUART_PORTS 10 47 48 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y)) 49 50 #define OMAP_UART_REV_42 0x0402 51 #define OMAP_UART_REV_46 0x0406 52 #define OMAP_UART_REV_52 0x0502 53 #define OMAP_UART_REV_63 0x0603 54 55 #define OMAP_UART_TX_WAKEUP_EN BIT(7) 56 57 /* Feature flags */ 58 #define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0) 59 60 #define UART_ERRATA_i202_MDR1_ACCESS BIT(0) 61 #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1) 62 63 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz */ 64 65 /* SCR register bitmasks */ 66 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) 67 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6) 68 #define OMAP_UART_SCR_TX_EMPTY (1 << 3) 69 70 /* FCR register bitmasks */ 71 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6) 72 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4) 73 74 /* MVR register bitmasks */ 75 #define OMAP_UART_MVR_SCHEME_SHIFT 30 76 77 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0 78 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4 79 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f 80 81 #define OMAP_UART_MVR_MAJ_MASK 0x700 82 #define OMAP_UART_MVR_MAJ_SHIFT 8 83 #define OMAP_UART_MVR_MIN_MASK 0x3f 84 85 #define OMAP_UART_DMA_CH_FREE -1 86 87 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA 88 #define OMAP_MODE13X_SPEED 230400 89 90 /* WER = 0x7F 91 * Enable module level wakeup in WER reg 92 */ 93 #define OMAP_UART_WER_MOD_WKUP 0x7F 94 95 /* Enable XON/XOFF flow control on output */ 96 #define OMAP_UART_SW_TX 0x08 97 98 /* Enable XON/XOFF flow control on input */ 99 #define OMAP_UART_SW_RX 0x02 100 101 #define OMAP_UART_SW_CLR 0xF0 102 103 #define OMAP_UART_TCR_TRIG 0x0F 104 105 struct uart_omap_dma { 106 u8 uart_dma_tx; 107 u8 uart_dma_rx; 108 int rx_dma_channel; 109 int tx_dma_channel; 110 dma_addr_t rx_buf_dma_phys; 111 dma_addr_t tx_buf_dma_phys; 112 unsigned int uart_base; 113 /* 114 * Buffer for rx dma. It is not required for tx because the buffer 115 * comes from port structure. 116 */ 117 unsigned char *rx_buf; 118 unsigned int prev_rx_dma_pos; 119 int tx_buf_size; 120 int tx_dma_used; 121 int rx_dma_used; 122 spinlock_t tx_lock; 123 spinlock_t rx_lock; 124 /* timer to poll activity on rx dma */ 125 struct timer_list rx_timer; 126 unsigned int rx_buf_size; 127 unsigned int rx_poll_rate; 128 unsigned int rx_timeout; 129 }; 130 131 struct uart_omap_port { 132 struct uart_port port; 133 struct uart_omap_dma uart_dma; 134 struct device *dev; 135 int wakeirq; 136 137 unsigned char ier; 138 unsigned char lcr; 139 unsigned char mcr; 140 unsigned char fcr; 141 unsigned char efr; 142 unsigned char dll; 143 unsigned char dlh; 144 unsigned char mdr1; 145 unsigned char scr; 146 unsigned char wer; 147 148 int use_dma; 149 /* 150 * Some bits in registers are cleared on a read, so they must 151 * be saved whenever the register is read, but the bits will not 152 * be immediately processed. 153 */ 154 unsigned int lsr_break_flag; 155 unsigned char msr_saved_flags; 156 char name[20]; 157 unsigned long port_activity; 158 int context_loss_cnt; 159 u32 errata; 160 u32 features; 161 162 int rts_gpio; 163 164 struct pm_qos_request pm_qos_request; 165 u32 latency; 166 u32 calc_latency; 167 struct work_struct qos_work; 168 bool is_suspending; 169 }; 170 171 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port))) 172 173 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS]; 174 175 /* Forward declaration of functions */ 176 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); 177 178 static inline unsigned int serial_in(struct uart_omap_port *up, int offset) 179 { 180 offset <<= up->port.regshift; 181 return readw(up->port.membase + offset); 182 } 183 184 static inline void serial_out(struct uart_omap_port *up, int offset, int value) 185 { 186 offset <<= up->port.regshift; 187 writew(value, up->port.membase + offset); 188 } 189 190 static inline void serial_omap_clear_fifos(struct uart_omap_port *up) 191 { 192 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 193 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 194 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 195 serial_out(up, UART_FCR, 0); 196 } 197 198 #ifdef CONFIG_PM 199 static int serial_omap_get_context_loss_count(struct uart_omap_port *up) 200 { 201 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev); 202 203 if (!pdata || !pdata->get_context_loss_count) 204 return -EINVAL; 205 206 return pdata->get_context_loss_count(up->dev); 207 } 208 209 /* REVISIT: Remove this when omap3 boots in device tree only mode */ 210 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable) 211 { 212 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev); 213 214 if (!pdata || !pdata->enable_wakeup) 215 return; 216 217 pdata->enable_wakeup(up->dev, enable); 218 } 219 #endif /* CONFIG_PM */ 220 221 /* 222 * Calculate the absolute difference between the desired and actual baud 223 * rate for the given mode. 224 */ 225 static inline int calculate_baud_abs_diff(struct uart_port *port, 226 unsigned int baud, unsigned int mode) 227 { 228 unsigned int n = port->uartclk / (mode * baud); 229 int abs_diff; 230 231 if (n == 0) 232 n = 1; 233 234 abs_diff = baud - (port->uartclk / (mode * n)); 235 if (abs_diff < 0) 236 abs_diff = -abs_diff; 237 238 return abs_diff; 239 } 240 241 /* 242 * serial_omap_baud_is_mode16 - check if baud rate is MODE16X 243 * @port: uart port info 244 * @baud: baudrate for which mode needs to be determined 245 * 246 * Returns true if baud rate is MODE16X and false if MODE13X 247 * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values, 248 * and Error Rates" determines modes not for all common baud rates. 249 * E.g. for 1000000 baud rate mode must be 16x, but according to that 250 * table it's determined as 13x. 251 */ 252 static bool 253 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud) 254 { 255 int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13); 256 int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16); 257 258 return (abs_diff_13 >= abs_diff_16); 259 } 260 261 /* 262 * serial_omap_get_divisor - calculate divisor value 263 * @port: uart port info 264 * @baud: baudrate for which divisor needs to be calculated. 265 */ 266 static unsigned int 267 serial_omap_get_divisor(struct uart_port *port, unsigned int baud) 268 { 269 unsigned int mode; 270 271 if (!serial_omap_baud_is_mode16(port, baud)) 272 mode = 13; 273 else 274 mode = 16; 275 return port->uartclk/(mode * baud); 276 } 277 278 static void serial_omap_enable_ms(struct uart_port *port) 279 { 280 struct uart_omap_port *up = to_uart_omap_port(port); 281 282 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); 283 284 pm_runtime_get_sync(up->dev); 285 up->ier |= UART_IER_MSI; 286 serial_out(up, UART_IER, up->ier); 287 pm_runtime_mark_last_busy(up->dev); 288 pm_runtime_put_autosuspend(up->dev); 289 } 290 291 static void serial_omap_stop_tx(struct uart_port *port) 292 { 293 struct uart_omap_port *up = to_uart_omap_port(port); 294 int res; 295 296 pm_runtime_get_sync(up->dev); 297 298 /* Handle RS-485 */ 299 if (port->rs485.flags & SER_RS485_ENABLED) { 300 if (up->scr & OMAP_UART_SCR_TX_EMPTY) { 301 /* THR interrupt is fired when both TX FIFO and TX 302 * shift register are empty. This means there's nothing 303 * left to transmit now, so make sure the THR interrupt 304 * is fired when TX FIFO is below the trigger level, 305 * disable THR interrupts and toggle the RS-485 GPIO 306 * data direction pin if needed. 307 */ 308 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 309 serial_out(up, UART_OMAP_SCR, up->scr); 310 res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 311 1 : 0; 312 if (gpio_get_value(up->rts_gpio) != res) { 313 if (port->rs485.delay_rts_after_send > 0) 314 mdelay( 315 port->rs485.delay_rts_after_send); 316 gpio_set_value(up->rts_gpio, res); 317 } 318 } else { 319 /* We're asked to stop, but there's still stuff in the 320 * UART FIFO, so make sure the THR interrupt is fired 321 * when both TX FIFO and TX shift register are empty. 322 * The next THR interrupt (if no transmission is started 323 * in the meantime) will indicate the end of a 324 * transmission. Therefore we _don't_ disable THR 325 * interrupts in this situation. 326 */ 327 up->scr |= OMAP_UART_SCR_TX_EMPTY; 328 serial_out(up, UART_OMAP_SCR, up->scr); 329 return; 330 } 331 } 332 333 if (up->ier & UART_IER_THRI) { 334 up->ier &= ~UART_IER_THRI; 335 serial_out(up, UART_IER, up->ier); 336 } 337 338 if ((port->rs485.flags & SER_RS485_ENABLED) && 339 !(port->rs485.flags & SER_RS485_RX_DURING_TX)) { 340 /* 341 * Empty the RX FIFO, we are not interested in anything 342 * received during the half-duplex transmission. 343 */ 344 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_RCVR); 345 /* Re-enable RX interrupts */ 346 up->ier |= UART_IER_RLSI | UART_IER_RDI; 347 up->port.read_status_mask |= UART_LSR_DR; 348 serial_out(up, UART_IER, up->ier); 349 } 350 351 pm_runtime_mark_last_busy(up->dev); 352 pm_runtime_put_autosuspend(up->dev); 353 } 354 355 static void serial_omap_stop_rx(struct uart_port *port) 356 { 357 struct uart_omap_port *up = to_uart_omap_port(port); 358 359 pm_runtime_get_sync(up->dev); 360 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); 361 up->port.read_status_mask &= ~UART_LSR_DR; 362 serial_out(up, UART_IER, up->ier); 363 pm_runtime_mark_last_busy(up->dev); 364 pm_runtime_put_autosuspend(up->dev); 365 } 366 367 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr) 368 { 369 struct circ_buf *xmit = &up->port.state->xmit; 370 int count; 371 372 if (up->port.x_char) { 373 serial_out(up, UART_TX, up->port.x_char); 374 up->port.icount.tx++; 375 up->port.x_char = 0; 376 return; 377 } 378 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 379 serial_omap_stop_tx(&up->port); 380 return; 381 } 382 count = up->port.fifosize / 4; 383 do { 384 serial_out(up, UART_TX, xmit->buf[xmit->tail]); 385 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 386 up->port.icount.tx++; 387 if (uart_circ_empty(xmit)) 388 break; 389 } while (--count > 0); 390 391 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 392 uart_write_wakeup(&up->port); 393 394 if (uart_circ_empty(xmit)) 395 serial_omap_stop_tx(&up->port); 396 } 397 398 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) 399 { 400 if (!(up->ier & UART_IER_THRI)) { 401 up->ier |= UART_IER_THRI; 402 serial_out(up, UART_IER, up->ier); 403 } 404 } 405 406 static void serial_omap_start_tx(struct uart_port *port) 407 { 408 struct uart_omap_port *up = to_uart_omap_port(port); 409 int res; 410 411 pm_runtime_get_sync(up->dev); 412 413 /* Handle RS-485 */ 414 if (port->rs485.flags & SER_RS485_ENABLED) { 415 /* Fire THR interrupts when FIFO is below trigger level */ 416 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 417 serial_out(up, UART_OMAP_SCR, up->scr); 418 419 /* if rts not already enabled */ 420 res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0; 421 if (gpio_get_value(up->rts_gpio) != res) { 422 gpio_set_value(up->rts_gpio, res); 423 if (port->rs485.delay_rts_before_send > 0) 424 mdelay(port->rs485.delay_rts_before_send); 425 } 426 } 427 428 if ((port->rs485.flags & SER_RS485_ENABLED) && 429 !(port->rs485.flags & SER_RS485_RX_DURING_TX)) 430 serial_omap_stop_rx(port); 431 432 serial_omap_enable_ier_thri(up); 433 pm_runtime_mark_last_busy(up->dev); 434 pm_runtime_put_autosuspend(up->dev); 435 } 436 437 static void serial_omap_throttle(struct uart_port *port) 438 { 439 struct uart_omap_port *up = to_uart_omap_port(port); 440 unsigned long flags; 441 442 pm_runtime_get_sync(up->dev); 443 spin_lock_irqsave(&up->port.lock, flags); 444 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); 445 serial_out(up, UART_IER, up->ier); 446 spin_unlock_irqrestore(&up->port.lock, flags); 447 pm_runtime_mark_last_busy(up->dev); 448 pm_runtime_put_autosuspend(up->dev); 449 } 450 451 static void serial_omap_unthrottle(struct uart_port *port) 452 { 453 struct uart_omap_port *up = to_uart_omap_port(port); 454 unsigned long flags; 455 456 pm_runtime_get_sync(up->dev); 457 spin_lock_irqsave(&up->port.lock, flags); 458 up->ier |= UART_IER_RLSI | UART_IER_RDI; 459 serial_out(up, UART_IER, up->ier); 460 spin_unlock_irqrestore(&up->port.lock, flags); 461 pm_runtime_mark_last_busy(up->dev); 462 pm_runtime_put_autosuspend(up->dev); 463 } 464 465 static unsigned int check_modem_status(struct uart_omap_port *up) 466 { 467 unsigned int status; 468 469 status = serial_in(up, UART_MSR); 470 status |= up->msr_saved_flags; 471 up->msr_saved_flags = 0; 472 if ((status & UART_MSR_ANY_DELTA) == 0) 473 return status; 474 475 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 476 up->port.state != NULL) { 477 if (status & UART_MSR_TERI) 478 up->port.icount.rng++; 479 if (status & UART_MSR_DDSR) 480 up->port.icount.dsr++; 481 if (status & UART_MSR_DDCD) 482 uart_handle_dcd_change 483 (&up->port, status & UART_MSR_DCD); 484 if (status & UART_MSR_DCTS) 485 uart_handle_cts_change 486 (&up->port, status & UART_MSR_CTS); 487 wake_up_interruptible(&up->port.state->port.delta_msr_wait); 488 } 489 490 return status; 491 } 492 493 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr) 494 { 495 unsigned int flag; 496 unsigned char ch = 0; 497 498 if (likely(lsr & UART_LSR_DR)) 499 ch = serial_in(up, UART_RX); 500 501 up->port.icount.rx++; 502 flag = TTY_NORMAL; 503 504 if (lsr & UART_LSR_BI) { 505 flag = TTY_BREAK; 506 lsr &= ~(UART_LSR_FE | UART_LSR_PE); 507 up->port.icount.brk++; 508 /* 509 * We do the SysRQ and SAK checking 510 * here because otherwise the break 511 * may get masked by ignore_status_mask 512 * or read_status_mask. 513 */ 514 if (uart_handle_break(&up->port)) 515 return; 516 517 } 518 519 if (lsr & UART_LSR_PE) { 520 flag = TTY_PARITY; 521 up->port.icount.parity++; 522 } 523 524 if (lsr & UART_LSR_FE) { 525 flag = TTY_FRAME; 526 up->port.icount.frame++; 527 } 528 529 if (lsr & UART_LSR_OE) 530 up->port.icount.overrun++; 531 532 #ifdef CONFIG_SERIAL_OMAP_CONSOLE 533 if (up->port.line == up->port.cons->index) { 534 /* Recover the break flag from console xmit */ 535 lsr |= up->lsr_break_flag; 536 } 537 #endif 538 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag); 539 } 540 541 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr) 542 { 543 unsigned char ch = 0; 544 unsigned int flag; 545 546 if (!(lsr & UART_LSR_DR)) 547 return; 548 549 ch = serial_in(up, UART_RX); 550 flag = TTY_NORMAL; 551 up->port.icount.rx++; 552 553 if (uart_handle_sysrq_char(&up->port, ch)) 554 return; 555 556 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); 557 } 558 559 /** 560 * serial_omap_irq() - This handles the interrupt from one port 561 * @irq: uart port irq number 562 * @dev_id: uart port info 563 */ 564 static irqreturn_t serial_omap_irq(int irq, void *dev_id) 565 { 566 struct uart_omap_port *up = dev_id; 567 unsigned int iir, lsr; 568 unsigned int type; 569 irqreturn_t ret = IRQ_NONE; 570 int max_count = 256; 571 572 spin_lock(&up->port.lock); 573 pm_runtime_get_sync(up->dev); 574 575 do { 576 iir = serial_in(up, UART_IIR); 577 if (iir & UART_IIR_NO_INT) 578 break; 579 580 ret = IRQ_HANDLED; 581 lsr = serial_in(up, UART_LSR); 582 583 /* extract IRQ type from IIR register */ 584 type = iir & 0x3e; 585 586 switch (type) { 587 case UART_IIR_MSI: 588 check_modem_status(up); 589 break; 590 case UART_IIR_THRI: 591 transmit_chars(up, lsr); 592 break; 593 case UART_IIR_RX_TIMEOUT: 594 /* FALLTHROUGH */ 595 case UART_IIR_RDI: 596 serial_omap_rdi(up, lsr); 597 break; 598 case UART_IIR_RLSI: 599 serial_omap_rlsi(up, lsr); 600 break; 601 case UART_IIR_CTS_RTS_DSR: 602 /* simply try again */ 603 break; 604 case UART_IIR_XOFF: 605 /* FALLTHROUGH */ 606 default: 607 break; 608 } 609 } while (max_count--); 610 611 spin_unlock(&up->port.lock); 612 613 tty_flip_buffer_push(&up->port.state->port); 614 615 pm_runtime_mark_last_busy(up->dev); 616 pm_runtime_put_autosuspend(up->dev); 617 up->port_activity = jiffies; 618 619 return ret; 620 } 621 622 static unsigned int serial_omap_tx_empty(struct uart_port *port) 623 { 624 struct uart_omap_port *up = to_uart_omap_port(port); 625 unsigned long flags = 0; 626 unsigned int ret = 0; 627 628 pm_runtime_get_sync(up->dev); 629 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); 630 spin_lock_irqsave(&up->port.lock, flags); 631 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 632 spin_unlock_irqrestore(&up->port.lock, flags); 633 pm_runtime_mark_last_busy(up->dev); 634 pm_runtime_put_autosuspend(up->dev); 635 return ret; 636 } 637 638 static unsigned int serial_omap_get_mctrl(struct uart_port *port) 639 { 640 struct uart_omap_port *up = to_uart_omap_port(port); 641 unsigned int status; 642 unsigned int ret = 0; 643 644 pm_runtime_get_sync(up->dev); 645 status = check_modem_status(up); 646 pm_runtime_mark_last_busy(up->dev); 647 pm_runtime_put_autosuspend(up->dev); 648 649 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); 650 651 if (status & UART_MSR_DCD) 652 ret |= TIOCM_CAR; 653 if (status & UART_MSR_RI) 654 ret |= TIOCM_RNG; 655 if (status & UART_MSR_DSR) 656 ret |= TIOCM_DSR; 657 if (status & UART_MSR_CTS) 658 ret |= TIOCM_CTS; 659 return ret; 660 } 661 662 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) 663 { 664 struct uart_omap_port *up = to_uart_omap_port(port); 665 unsigned char mcr = 0, old_mcr, lcr; 666 667 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); 668 if (mctrl & TIOCM_RTS) 669 mcr |= UART_MCR_RTS; 670 if (mctrl & TIOCM_DTR) 671 mcr |= UART_MCR_DTR; 672 if (mctrl & TIOCM_OUT1) 673 mcr |= UART_MCR_OUT1; 674 if (mctrl & TIOCM_OUT2) 675 mcr |= UART_MCR_OUT2; 676 if (mctrl & TIOCM_LOOP) 677 mcr |= UART_MCR_LOOP; 678 679 pm_runtime_get_sync(up->dev); 680 old_mcr = serial_in(up, UART_MCR); 681 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 | 682 UART_MCR_DTR | UART_MCR_RTS); 683 up->mcr = old_mcr | mcr; 684 serial_out(up, UART_MCR, up->mcr); 685 686 /* Turn off autoRTS if RTS is lowered; restore autoRTS if RTS raised */ 687 lcr = serial_in(up, UART_LCR); 688 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 689 if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS)) 690 up->efr |= UART_EFR_RTS; 691 else 692 up->efr &= ~UART_EFR_RTS; 693 serial_out(up, UART_EFR, up->efr); 694 serial_out(up, UART_LCR, lcr); 695 696 pm_runtime_mark_last_busy(up->dev); 697 pm_runtime_put_autosuspend(up->dev); 698 } 699 700 static void serial_omap_break_ctl(struct uart_port *port, int break_state) 701 { 702 struct uart_omap_port *up = to_uart_omap_port(port); 703 unsigned long flags = 0; 704 705 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); 706 pm_runtime_get_sync(up->dev); 707 spin_lock_irqsave(&up->port.lock, flags); 708 if (break_state == -1) 709 up->lcr |= UART_LCR_SBC; 710 else 711 up->lcr &= ~UART_LCR_SBC; 712 serial_out(up, UART_LCR, up->lcr); 713 spin_unlock_irqrestore(&up->port.lock, flags); 714 pm_runtime_mark_last_busy(up->dev); 715 pm_runtime_put_autosuspend(up->dev); 716 } 717 718 static int serial_omap_startup(struct uart_port *port) 719 { 720 struct uart_omap_port *up = to_uart_omap_port(port); 721 unsigned long flags = 0; 722 int retval; 723 724 /* 725 * Allocate the IRQ 726 */ 727 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags, 728 up->name, up); 729 if (retval) 730 return retval; 731 732 /* Optional wake-up IRQ */ 733 if (up->wakeirq) { 734 retval = dev_pm_set_dedicated_wake_irq(up->dev, up->wakeirq); 735 if (retval) { 736 free_irq(up->port.irq, up); 737 return retval; 738 } 739 } 740 741 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); 742 743 pm_runtime_get_sync(up->dev); 744 /* 745 * Clear the FIFO buffers and disable them. 746 * (they will be reenabled in set_termios()) 747 */ 748 serial_omap_clear_fifos(up); 749 750 /* 751 * Clear the interrupt registers. 752 */ 753 (void) serial_in(up, UART_LSR); 754 if (serial_in(up, UART_LSR) & UART_LSR_DR) 755 (void) serial_in(up, UART_RX); 756 (void) serial_in(up, UART_IIR); 757 (void) serial_in(up, UART_MSR); 758 759 /* 760 * Now, initialize the UART 761 */ 762 serial_out(up, UART_LCR, UART_LCR_WLEN8); 763 spin_lock_irqsave(&up->port.lock, flags); 764 /* 765 * Most PC uarts need OUT2 raised to enable interrupts. 766 */ 767 up->port.mctrl |= TIOCM_OUT2; 768 serial_omap_set_mctrl(&up->port, up->port.mctrl); 769 spin_unlock_irqrestore(&up->port.lock, flags); 770 771 up->msr_saved_flags = 0; 772 /* 773 * Finally, enable interrupts. Note: Modem status interrupts 774 * are set via set_termios(), which will be occurring imminently 775 * anyway, so we don't enable them here. 776 */ 777 up->ier = UART_IER_RLSI | UART_IER_RDI; 778 serial_out(up, UART_IER, up->ier); 779 780 /* Enable module level wake up */ 781 up->wer = OMAP_UART_WER_MOD_WKUP; 782 if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP) 783 up->wer |= OMAP_UART_TX_WAKEUP_EN; 784 785 serial_out(up, UART_OMAP_WER, up->wer); 786 787 pm_runtime_mark_last_busy(up->dev); 788 pm_runtime_put_autosuspend(up->dev); 789 up->port_activity = jiffies; 790 return 0; 791 } 792 793 static void serial_omap_shutdown(struct uart_port *port) 794 { 795 struct uart_omap_port *up = to_uart_omap_port(port); 796 unsigned long flags = 0; 797 798 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line); 799 800 pm_runtime_get_sync(up->dev); 801 /* 802 * Disable interrupts from this port 803 */ 804 up->ier = 0; 805 serial_out(up, UART_IER, 0); 806 807 spin_lock_irqsave(&up->port.lock, flags); 808 up->port.mctrl &= ~TIOCM_OUT2; 809 serial_omap_set_mctrl(&up->port, up->port.mctrl); 810 spin_unlock_irqrestore(&up->port.lock, flags); 811 812 /* 813 * Disable break condition and FIFOs 814 */ 815 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 816 serial_omap_clear_fifos(up); 817 818 /* 819 * Read data port to reset things, and then free the irq 820 */ 821 if (serial_in(up, UART_LSR) & UART_LSR_DR) 822 (void) serial_in(up, UART_RX); 823 824 pm_runtime_mark_last_busy(up->dev); 825 pm_runtime_put_autosuspend(up->dev); 826 free_irq(up->port.irq, up); 827 dev_pm_clear_wake_irq(up->dev); 828 } 829 830 static void serial_omap_uart_qos_work(struct work_struct *work) 831 { 832 struct uart_omap_port *up = container_of(work, struct uart_omap_port, 833 qos_work); 834 835 pm_qos_update_request(&up->pm_qos_request, up->latency); 836 } 837 838 static void 839 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, 840 struct ktermios *old) 841 { 842 struct uart_omap_port *up = to_uart_omap_port(port); 843 unsigned char cval = 0; 844 unsigned long flags = 0; 845 unsigned int baud, quot; 846 847 switch (termios->c_cflag & CSIZE) { 848 case CS5: 849 cval = UART_LCR_WLEN5; 850 break; 851 case CS6: 852 cval = UART_LCR_WLEN6; 853 break; 854 case CS7: 855 cval = UART_LCR_WLEN7; 856 break; 857 default: 858 case CS8: 859 cval = UART_LCR_WLEN8; 860 break; 861 } 862 863 if (termios->c_cflag & CSTOPB) 864 cval |= UART_LCR_STOP; 865 if (termios->c_cflag & PARENB) 866 cval |= UART_LCR_PARITY; 867 if (!(termios->c_cflag & PARODD)) 868 cval |= UART_LCR_EPAR; 869 if (termios->c_cflag & CMSPAR) 870 cval |= UART_LCR_SPAR; 871 872 /* 873 * Ask the core to calculate the divisor for us. 874 */ 875 876 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13); 877 quot = serial_omap_get_divisor(port, baud); 878 879 /* calculate wakeup latency constraint */ 880 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8); 881 up->latency = up->calc_latency; 882 schedule_work(&up->qos_work); 883 884 up->dll = quot & 0xff; 885 up->dlh = quot >> 8; 886 up->mdr1 = UART_OMAP_MDR1_DISABLE; 887 888 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 | 889 UART_FCR_ENABLE_FIFO; 890 891 /* 892 * Ok, we're now changing the port state. Do it with 893 * interrupts disabled. 894 */ 895 pm_runtime_get_sync(up->dev); 896 spin_lock_irqsave(&up->port.lock, flags); 897 898 /* 899 * Update the per-port timeout. 900 */ 901 uart_update_timeout(port, termios->c_cflag, baud); 902 903 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 904 if (termios->c_iflag & INPCK) 905 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 906 if (termios->c_iflag & (BRKINT | PARMRK)) 907 up->port.read_status_mask |= UART_LSR_BI; 908 909 /* 910 * Characters to ignore 911 */ 912 up->port.ignore_status_mask = 0; 913 if (termios->c_iflag & IGNPAR) 914 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 915 if (termios->c_iflag & IGNBRK) { 916 up->port.ignore_status_mask |= UART_LSR_BI; 917 /* 918 * If we're ignoring parity and break indicators, 919 * ignore overruns too (for real raw support). 920 */ 921 if (termios->c_iflag & IGNPAR) 922 up->port.ignore_status_mask |= UART_LSR_OE; 923 } 924 925 /* 926 * ignore all characters if CREAD is not set 927 */ 928 if ((termios->c_cflag & CREAD) == 0) 929 up->port.ignore_status_mask |= UART_LSR_DR; 930 931 /* 932 * Modem status interrupts 933 */ 934 up->ier &= ~UART_IER_MSI; 935 if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 936 up->ier |= UART_IER_MSI; 937 serial_out(up, UART_IER, up->ier); 938 serial_out(up, UART_LCR, cval); /* reset DLAB */ 939 up->lcr = cval; 940 up->scr = 0; 941 942 /* FIFOs and DMA Settings */ 943 944 /* FCR can be changed only when the 945 * baud clock is not running 946 * DLL_REG and DLH_REG set to 0. 947 */ 948 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 949 serial_out(up, UART_DLL, 0); 950 serial_out(up, UART_DLM, 0); 951 serial_out(up, UART_LCR, 0); 952 953 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 954 955 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB; 956 up->efr &= ~UART_EFR_SCD; 957 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 958 959 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 960 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR; 961 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 962 /* FIFO ENABLE, DMA MODE */ 963 964 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK; 965 /* 966 * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK 967 * sets Enables the granularity of 1 for TRIGGER RX 968 * level. Along with setting RX FIFO trigger level 969 * to 1 (as noted below, 16 characters) and TLR[3:0] 970 * to zero this will result RX FIFO threshold level 971 * to 1 character, instead of 16 as noted in comment 972 * below. 973 */ 974 975 /* Set receive FIFO threshold to 16 characters and 976 * transmit FIFO threshold to 32 spaces 977 */ 978 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK; 979 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK; 980 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 | 981 UART_FCR_ENABLE_FIFO; 982 983 serial_out(up, UART_FCR, up->fcr); 984 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 985 986 serial_out(up, UART_OMAP_SCR, up->scr); 987 988 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */ 989 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 990 serial_out(up, UART_MCR, up->mcr); 991 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 992 serial_out(up, UART_EFR, up->efr); 993 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 994 995 /* Protocol, Baud Rate, and Interrupt Settings */ 996 997 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 998 serial_omap_mdr1_errataset(up, up->mdr1); 999 else 1000 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1001 1002 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1003 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 1004 1005 serial_out(up, UART_LCR, 0); 1006 serial_out(up, UART_IER, 0); 1007 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1008 1009 serial_out(up, UART_DLL, up->dll); /* LS of divisor */ 1010 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */ 1011 1012 serial_out(up, UART_LCR, 0); 1013 serial_out(up, UART_IER, up->ier); 1014 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1015 1016 serial_out(up, UART_EFR, up->efr); 1017 serial_out(up, UART_LCR, cval); 1018 1019 if (!serial_omap_baud_is_mode16(port, baud)) 1020 up->mdr1 = UART_OMAP_MDR1_13X_MODE; 1021 else 1022 up->mdr1 = UART_OMAP_MDR1_16X_MODE; 1023 1024 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1025 serial_omap_mdr1_errataset(up, up->mdr1); 1026 else 1027 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1028 1029 /* Configure flow control */ 1030 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1031 1032 /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */ 1033 serial_out(up, UART_XON1, termios->c_cc[VSTART]); 1034 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]); 1035 1036 /* Enable access to TCR/TLR */ 1037 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); 1038 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1039 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); 1040 1041 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); 1042 1043 up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); 1044 1045 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) { 1046 /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */ 1047 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; 1048 up->efr |= UART_EFR_CTS; 1049 } else { 1050 /* Disable AUTORTS and AUTOCTS */ 1051 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS); 1052 } 1053 1054 if (up->port.flags & UPF_SOFT_FLOW) { 1055 /* clear SW control mode bits */ 1056 up->efr &= OMAP_UART_SW_CLR; 1057 1058 /* 1059 * IXON Flag: 1060 * Enable XON/XOFF flow control on input. 1061 * Receiver compares XON1, XOFF1. 1062 */ 1063 if (termios->c_iflag & IXON) 1064 up->efr |= OMAP_UART_SW_RX; 1065 1066 /* 1067 * IXOFF Flag: 1068 * Enable XON/XOFF flow control on output. 1069 * Transmit XON1, XOFF1 1070 */ 1071 if (termios->c_iflag & IXOFF) { 1072 up->port.status |= UPSTAT_AUTOXOFF; 1073 up->efr |= OMAP_UART_SW_TX; 1074 } 1075 1076 /* 1077 * IXANY Flag: 1078 * Enable any character to restart output. 1079 * Operation resumes after receiving any 1080 * character after recognition of the XOFF character 1081 */ 1082 if (termios->c_iflag & IXANY) 1083 up->mcr |= UART_MCR_XONANY; 1084 else 1085 up->mcr &= ~UART_MCR_XONANY; 1086 } 1087 serial_out(up, UART_MCR, up->mcr); 1088 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1089 serial_out(up, UART_EFR, up->efr); 1090 serial_out(up, UART_LCR, up->lcr); 1091 1092 serial_omap_set_mctrl(&up->port, up->port.mctrl); 1093 1094 spin_unlock_irqrestore(&up->port.lock, flags); 1095 pm_runtime_mark_last_busy(up->dev); 1096 pm_runtime_put_autosuspend(up->dev); 1097 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); 1098 } 1099 1100 static void 1101 serial_omap_pm(struct uart_port *port, unsigned int state, 1102 unsigned int oldstate) 1103 { 1104 struct uart_omap_port *up = to_uart_omap_port(port); 1105 unsigned char efr; 1106 1107 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); 1108 1109 pm_runtime_get_sync(up->dev); 1110 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1111 efr = serial_in(up, UART_EFR); 1112 serial_out(up, UART_EFR, efr | UART_EFR_ECB); 1113 serial_out(up, UART_LCR, 0); 1114 1115 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); 1116 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 1117 serial_out(up, UART_EFR, efr); 1118 serial_out(up, UART_LCR, 0); 1119 1120 pm_runtime_mark_last_busy(up->dev); 1121 pm_runtime_put_autosuspend(up->dev); 1122 } 1123 1124 static void serial_omap_release_port(struct uart_port *port) 1125 { 1126 dev_dbg(port->dev, "serial_omap_release_port+\n"); 1127 } 1128 1129 static int serial_omap_request_port(struct uart_port *port) 1130 { 1131 dev_dbg(port->dev, "serial_omap_request_port+\n"); 1132 return 0; 1133 } 1134 1135 static void serial_omap_config_port(struct uart_port *port, int flags) 1136 { 1137 struct uart_omap_port *up = to_uart_omap_port(port); 1138 1139 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n", 1140 up->port.line); 1141 up->port.type = PORT_OMAP; 1142 up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW; 1143 } 1144 1145 static int 1146 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser) 1147 { 1148 /* we don't want the core code to modify any port params */ 1149 dev_dbg(port->dev, "serial_omap_verify_port+\n"); 1150 return -EINVAL; 1151 } 1152 1153 static const char * 1154 serial_omap_type(struct uart_port *port) 1155 { 1156 struct uart_omap_port *up = to_uart_omap_port(port); 1157 1158 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line); 1159 return up->name; 1160 } 1161 1162 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 1163 1164 static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up) 1165 { 1166 unsigned int status, tmout = 10000; 1167 1168 /* Wait up to 10ms for the character(s) to be sent. */ 1169 do { 1170 status = serial_in(up, UART_LSR); 1171 1172 if (status & UART_LSR_BI) 1173 up->lsr_break_flag = UART_LSR_BI; 1174 1175 if (--tmout == 0) 1176 break; 1177 udelay(1); 1178 } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 1179 1180 /* Wait up to 1s for flow control if necessary */ 1181 if (up->port.flags & UPF_CONS_FLOW) { 1182 tmout = 1000000; 1183 for (tmout = 1000000; tmout; tmout--) { 1184 unsigned int msr = serial_in(up, UART_MSR); 1185 1186 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 1187 if (msr & UART_MSR_CTS) 1188 break; 1189 1190 udelay(1); 1191 } 1192 } 1193 } 1194 1195 #ifdef CONFIG_CONSOLE_POLL 1196 1197 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) 1198 { 1199 struct uart_omap_port *up = to_uart_omap_port(port); 1200 1201 pm_runtime_get_sync(up->dev); 1202 wait_for_xmitr(up); 1203 serial_out(up, UART_TX, ch); 1204 pm_runtime_mark_last_busy(up->dev); 1205 pm_runtime_put_autosuspend(up->dev); 1206 } 1207 1208 static int serial_omap_poll_get_char(struct uart_port *port) 1209 { 1210 struct uart_omap_port *up = to_uart_omap_port(port); 1211 unsigned int status; 1212 1213 pm_runtime_get_sync(up->dev); 1214 status = serial_in(up, UART_LSR); 1215 if (!(status & UART_LSR_DR)) { 1216 status = NO_POLL_CHAR; 1217 goto out; 1218 } 1219 1220 status = serial_in(up, UART_RX); 1221 1222 out: 1223 pm_runtime_mark_last_busy(up->dev); 1224 pm_runtime_put_autosuspend(up->dev); 1225 1226 return status; 1227 } 1228 1229 #endif /* CONFIG_CONSOLE_POLL */ 1230 1231 #ifdef CONFIG_SERIAL_OMAP_CONSOLE 1232 1233 #ifdef CONFIG_SERIAL_EARLYCON 1234 static unsigned int omap_serial_early_in(struct uart_port *port, int offset) 1235 { 1236 offset <<= port->regshift; 1237 return readw(port->membase + offset); 1238 } 1239 1240 static void omap_serial_early_out(struct uart_port *port, int offset, 1241 int value) 1242 { 1243 offset <<= port->regshift; 1244 writew(value, port->membase + offset); 1245 } 1246 1247 static void omap_serial_early_putc(struct uart_port *port, int c) 1248 { 1249 unsigned int status; 1250 1251 for (;;) { 1252 status = omap_serial_early_in(port, UART_LSR); 1253 if ((status & BOTH_EMPTY) == BOTH_EMPTY) 1254 break; 1255 cpu_relax(); 1256 } 1257 omap_serial_early_out(port, UART_TX, c); 1258 } 1259 1260 static void early_omap_serial_write(struct console *console, const char *s, 1261 unsigned int count) 1262 { 1263 struct earlycon_device *device = console->data; 1264 struct uart_port *port = &device->port; 1265 1266 uart_console_write(port, s, count, omap_serial_early_putc); 1267 } 1268 1269 static int __init early_omap_serial_setup(struct earlycon_device *device, 1270 const char *options) 1271 { 1272 struct uart_port *port = &device->port; 1273 1274 if (!(device->port.membase || device->port.iobase)) 1275 return -ENODEV; 1276 1277 port->regshift = 2; 1278 device->con->write = early_omap_serial_write; 1279 return 0; 1280 } 1281 1282 OF_EARLYCON_DECLARE(omapserial, "ti,omap2-uart", early_omap_serial_setup); 1283 OF_EARLYCON_DECLARE(omapserial, "ti,omap3-uart", early_omap_serial_setup); 1284 OF_EARLYCON_DECLARE(omapserial, "ti,omap4-uart", early_omap_serial_setup); 1285 #endif /* CONFIG_SERIAL_EARLYCON */ 1286 1287 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS]; 1288 1289 static struct uart_driver serial_omap_reg; 1290 1291 static void serial_omap_console_putchar(struct uart_port *port, int ch) 1292 { 1293 struct uart_omap_port *up = to_uart_omap_port(port); 1294 1295 wait_for_xmitr(up); 1296 serial_out(up, UART_TX, ch); 1297 } 1298 1299 static void 1300 serial_omap_console_write(struct console *co, const char *s, 1301 unsigned int count) 1302 { 1303 struct uart_omap_port *up = serial_omap_console_ports[co->index]; 1304 unsigned long flags; 1305 unsigned int ier; 1306 int locked = 1; 1307 1308 pm_runtime_get_sync(up->dev); 1309 1310 local_irq_save(flags); 1311 if (up->port.sysrq) 1312 locked = 0; 1313 else if (oops_in_progress) 1314 locked = spin_trylock(&up->port.lock); 1315 else 1316 spin_lock(&up->port.lock); 1317 1318 /* 1319 * First save the IER then disable the interrupts 1320 */ 1321 ier = serial_in(up, UART_IER); 1322 serial_out(up, UART_IER, 0); 1323 1324 uart_console_write(&up->port, s, count, serial_omap_console_putchar); 1325 1326 /* 1327 * Finally, wait for transmitter to become empty 1328 * and restore the IER 1329 */ 1330 wait_for_xmitr(up); 1331 serial_out(up, UART_IER, ier); 1332 /* 1333 * The receive handling will happen properly because the 1334 * receive ready bit will still be set; it is not cleared 1335 * on read. However, modem control will not, we must 1336 * call it if we have saved something in the saved flags 1337 * while processing with interrupts off. 1338 */ 1339 if (up->msr_saved_flags) 1340 check_modem_status(up); 1341 1342 pm_runtime_mark_last_busy(up->dev); 1343 pm_runtime_put_autosuspend(up->dev); 1344 if (locked) 1345 spin_unlock(&up->port.lock); 1346 local_irq_restore(flags); 1347 } 1348 1349 static int __init 1350 serial_omap_console_setup(struct console *co, char *options) 1351 { 1352 struct uart_omap_port *up; 1353 int baud = 115200; 1354 int bits = 8; 1355 int parity = 'n'; 1356 int flow = 'n'; 1357 1358 if (serial_omap_console_ports[co->index] == NULL) 1359 return -ENODEV; 1360 up = serial_omap_console_ports[co->index]; 1361 1362 if (options) 1363 uart_parse_options(options, &baud, &parity, &bits, &flow); 1364 1365 return uart_set_options(&up->port, co, baud, parity, bits, flow); 1366 } 1367 1368 static struct console serial_omap_console = { 1369 .name = OMAP_SERIAL_NAME, 1370 .write = serial_omap_console_write, 1371 .device = uart_console_device, 1372 .setup = serial_omap_console_setup, 1373 .flags = CON_PRINTBUFFER, 1374 .index = -1, 1375 .data = &serial_omap_reg, 1376 }; 1377 1378 static void serial_omap_add_console_port(struct uart_omap_port *up) 1379 { 1380 serial_omap_console_ports[up->port.line] = up; 1381 } 1382 1383 #define OMAP_CONSOLE (&serial_omap_console) 1384 1385 #else 1386 1387 #define OMAP_CONSOLE NULL 1388 1389 static inline void serial_omap_add_console_port(struct uart_omap_port *up) 1390 {} 1391 1392 #endif 1393 1394 /* Enable or disable the rs485 support */ 1395 static int 1396 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485) 1397 { 1398 struct uart_omap_port *up = to_uart_omap_port(port); 1399 unsigned int mode; 1400 int val; 1401 1402 pm_runtime_get_sync(up->dev); 1403 1404 /* Disable interrupts from this port */ 1405 mode = up->ier; 1406 up->ier = 0; 1407 serial_out(up, UART_IER, 0); 1408 1409 /* Clamp the delays to [0, 100ms] */ 1410 rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U); 1411 rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U); 1412 1413 /* store new config */ 1414 port->rs485 = *rs485; 1415 1416 /* 1417 * Just as a precaution, only allow rs485 1418 * to be enabled if the gpio pin is valid 1419 */ 1420 if (gpio_is_valid(up->rts_gpio)) { 1421 /* enable / disable rts */ 1422 val = (port->rs485.flags & SER_RS485_ENABLED) ? 1423 SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND; 1424 val = (port->rs485.flags & val) ? 1 : 0; 1425 gpio_set_value(up->rts_gpio, val); 1426 } else 1427 port->rs485.flags &= ~SER_RS485_ENABLED; 1428 1429 /* Enable interrupts */ 1430 up->ier = mode; 1431 serial_out(up, UART_IER, up->ier); 1432 1433 /* If RS-485 is disabled, make sure the THR interrupt is fired when 1434 * TX FIFO is below the trigger level. 1435 */ 1436 if (!(port->rs485.flags & SER_RS485_ENABLED) && 1437 (up->scr & OMAP_UART_SCR_TX_EMPTY)) { 1438 up->scr &= ~OMAP_UART_SCR_TX_EMPTY; 1439 serial_out(up, UART_OMAP_SCR, up->scr); 1440 } 1441 1442 pm_runtime_mark_last_busy(up->dev); 1443 pm_runtime_put_autosuspend(up->dev); 1444 1445 return 0; 1446 } 1447 1448 static const struct uart_ops serial_omap_pops = { 1449 .tx_empty = serial_omap_tx_empty, 1450 .set_mctrl = serial_omap_set_mctrl, 1451 .get_mctrl = serial_omap_get_mctrl, 1452 .stop_tx = serial_omap_stop_tx, 1453 .start_tx = serial_omap_start_tx, 1454 .throttle = serial_omap_throttle, 1455 .unthrottle = serial_omap_unthrottle, 1456 .stop_rx = serial_omap_stop_rx, 1457 .enable_ms = serial_omap_enable_ms, 1458 .break_ctl = serial_omap_break_ctl, 1459 .startup = serial_omap_startup, 1460 .shutdown = serial_omap_shutdown, 1461 .set_termios = serial_omap_set_termios, 1462 .pm = serial_omap_pm, 1463 .type = serial_omap_type, 1464 .release_port = serial_omap_release_port, 1465 .request_port = serial_omap_request_port, 1466 .config_port = serial_omap_config_port, 1467 .verify_port = serial_omap_verify_port, 1468 #ifdef CONFIG_CONSOLE_POLL 1469 .poll_put_char = serial_omap_poll_put_char, 1470 .poll_get_char = serial_omap_poll_get_char, 1471 #endif 1472 }; 1473 1474 static struct uart_driver serial_omap_reg = { 1475 .owner = THIS_MODULE, 1476 .driver_name = "OMAP-SERIAL", 1477 .dev_name = OMAP_SERIAL_NAME, 1478 .nr = OMAP_MAX_HSUART_PORTS, 1479 .cons = OMAP_CONSOLE, 1480 }; 1481 1482 #ifdef CONFIG_PM_SLEEP 1483 static int serial_omap_prepare(struct device *dev) 1484 { 1485 struct uart_omap_port *up = dev_get_drvdata(dev); 1486 1487 up->is_suspending = true; 1488 1489 return 0; 1490 } 1491 1492 static void serial_omap_complete(struct device *dev) 1493 { 1494 struct uart_omap_port *up = dev_get_drvdata(dev); 1495 1496 up->is_suspending = false; 1497 } 1498 1499 static int serial_omap_suspend(struct device *dev) 1500 { 1501 struct uart_omap_port *up = dev_get_drvdata(dev); 1502 1503 uart_suspend_port(&serial_omap_reg, &up->port); 1504 flush_work(&up->qos_work); 1505 1506 if (device_may_wakeup(dev)) 1507 serial_omap_enable_wakeup(up, true); 1508 else 1509 serial_omap_enable_wakeup(up, false); 1510 1511 return 0; 1512 } 1513 1514 static int serial_omap_resume(struct device *dev) 1515 { 1516 struct uart_omap_port *up = dev_get_drvdata(dev); 1517 1518 if (device_may_wakeup(dev)) 1519 serial_omap_enable_wakeup(up, false); 1520 1521 uart_resume_port(&serial_omap_reg, &up->port); 1522 1523 return 0; 1524 } 1525 #else 1526 #define serial_omap_prepare NULL 1527 #define serial_omap_complete NULL 1528 #endif /* CONFIG_PM_SLEEP */ 1529 1530 static void omap_serial_fill_features_erratas(struct uart_omap_port *up) 1531 { 1532 u32 mvr, scheme; 1533 u16 revision, major, minor; 1534 1535 mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift)); 1536 1537 /* Check revision register scheme */ 1538 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT; 1539 1540 switch (scheme) { 1541 case 0: /* Legacy Scheme: OMAP2/3 */ 1542 /* MINOR_REV[0:4], MAJOR_REV[4:7] */ 1543 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >> 1544 OMAP_UART_LEGACY_MVR_MAJ_SHIFT; 1545 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK); 1546 break; 1547 case 1: 1548 /* New Scheme: OMAP4+ */ 1549 /* MINOR_REV[0:5], MAJOR_REV[8:10] */ 1550 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >> 1551 OMAP_UART_MVR_MAJ_SHIFT; 1552 minor = (mvr & OMAP_UART_MVR_MIN_MASK); 1553 break; 1554 default: 1555 dev_warn(up->dev, 1556 "Unknown %s revision, defaulting to highest\n", 1557 up->name); 1558 /* highest possible revision */ 1559 major = 0xff; 1560 minor = 0xff; 1561 } 1562 1563 /* normalize revision for the driver */ 1564 revision = UART_BUILD_REVISION(major, minor); 1565 1566 switch (revision) { 1567 case OMAP_UART_REV_46: 1568 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | 1569 UART_ERRATA_i291_DMA_FORCEIDLE); 1570 break; 1571 case OMAP_UART_REV_52: 1572 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS | 1573 UART_ERRATA_i291_DMA_FORCEIDLE); 1574 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP; 1575 break; 1576 case OMAP_UART_REV_63: 1577 up->errata |= UART_ERRATA_i202_MDR1_ACCESS; 1578 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP; 1579 break; 1580 default: 1581 break; 1582 } 1583 } 1584 1585 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev) 1586 { 1587 struct omap_uart_port_info *omap_up_info; 1588 1589 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL); 1590 if (!omap_up_info) 1591 return NULL; /* out of memory */ 1592 1593 of_property_read_u32(dev->of_node, "clock-frequency", 1594 &omap_up_info->uartclk); 1595 1596 omap_up_info->flags = UPF_BOOT_AUTOCONF; 1597 1598 return omap_up_info; 1599 } 1600 1601 static int serial_omap_probe_rs485(struct uart_omap_port *up, 1602 struct device_node *np) 1603 { 1604 struct serial_rs485 *rs485conf = &up->port.rs485; 1605 enum of_gpio_flags flags; 1606 int ret; 1607 1608 rs485conf->flags = 0; 1609 up->rts_gpio = -EINVAL; 1610 1611 if (!np) 1612 return 0; 1613 1614 if (of_property_read_bool(np, "rs485-rts-active-high")) 1615 rs485conf->flags |= SER_RS485_RTS_ON_SEND; 1616 else 1617 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 1618 1619 /* check for tx enable gpio */ 1620 up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags); 1621 if (gpio_is_valid(up->rts_gpio)) { 1622 ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial"); 1623 if (ret < 0) 1624 return ret; 1625 ret = gpio_direction_output(up->rts_gpio, 1626 flags & SER_RS485_RTS_AFTER_SEND); 1627 if (ret < 0) 1628 return ret; 1629 } else if (up->rts_gpio == -EPROBE_DEFER) { 1630 return -EPROBE_DEFER; 1631 } else { 1632 up->rts_gpio = -EINVAL; 1633 } 1634 1635 of_get_rs485_mode(np, rs485conf); 1636 1637 return 0; 1638 } 1639 1640 static int serial_omap_probe(struct platform_device *pdev) 1641 { 1642 struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev); 1643 struct uart_omap_port *up; 1644 struct resource *mem; 1645 void __iomem *base; 1646 int uartirq = 0; 1647 int wakeirq = 0; 1648 int ret; 1649 1650 /* The optional wakeirq may be specified in the board dts file */ 1651 if (pdev->dev.of_node) { 1652 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0); 1653 if (!uartirq) 1654 return -EPROBE_DEFER; 1655 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1); 1656 omap_up_info = of_get_uart_port_info(&pdev->dev); 1657 pdev->dev.platform_data = omap_up_info; 1658 } else { 1659 uartirq = platform_get_irq(pdev, 0); 1660 if (uartirq < 0) 1661 return -EPROBE_DEFER; 1662 } 1663 1664 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL); 1665 if (!up) 1666 return -ENOMEM; 1667 1668 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1669 base = devm_ioremap_resource(&pdev->dev, mem); 1670 if (IS_ERR(base)) 1671 return PTR_ERR(base); 1672 1673 up->dev = &pdev->dev; 1674 up->port.dev = &pdev->dev; 1675 up->port.type = PORT_OMAP; 1676 up->port.iotype = UPIO_MEM; 1677 up->port.irq = uartirq; 1678 up->port.regshift = 2; 1679 up->port.fifosize = 64; 1680 up->port.ops = &serial_omap_pops; 1681 1682 if (pdev->dev.of_node) 1683 ret = of_alias_get_id(pdev->dev.of_node, "serial"); 1684 else 1685 ret = pdev->id; 1686 1687 if (ret < 0) { 1688 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", 1689 ret); 1690 goto err_port_line; 1691 } 1692 up->port.line = ret; 1693 1694 if (up->port.line >= OMAP_MAX_HSUART_PORTS) { 1695 dev_err(&pdev->dev, "uart ID %d > MAX %d.\n", up->port.line, 1696 OMAP_MAX_HSUART_PORTS); 1697 ret = -ENXIO; 1698 goto err_port_line; 1699 } 1700 1701 up->wakeirq = wakeirq; 1702 if (!up->wakeirq) 1703 dev_info(up->port.dev, "no wakeirq for uart%d\n", 1704 up->port.line); 1705 1706 ret = serial_omap_probe_rs485(up, pdev->dev.of_node); 1707 if (ret < 0) 1708 goto err_rs485; 1709 1710 sprintf(up->name, "OMAP UART%d", up->port.line); 1711 up->port.mapbase = mem->start; 1712 up->port.membase = base; 1713 up->port.flags = omap_up_info->flags; 1714 up->port.uartclk = omap_up_info->uartclk; 1715 up->port.rs485_config = serial_omap_config_rs485; 1716 if (!up->port.uartclk) { 1717 up->port.uartclk = DEFAULT_CLK_SPEED; 1718 dev_warn(&pdev->dev, 1719 "No clock speed specified: using default: %d\n", 1720 DEFAULT_CLK_SPEED); 1721 } 1722 1723 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1724 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1725 pm_qos_add_request(&up->pm_qos_request, 1726 PM_QOS_CPU_DMA_LATENCY, up->latency); 1727 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); 1728 1729 platform_set_drvdata(pdev, up); 1730 if (omap_up_info->autosuspend_timeout == 0) 1731 omap_up_info->autosuspend_timeout = -1; 1732 1733 device_init_wakeup(up->dev, true); 1734 pm_runtime_use_autosuspend(&pdev->dev); 1735 pm_runtime_set_autosuspend_delay(&pdev->dev, 1736 omap_up_info->autosuspend_timeout); 1737 1738 pm_runtime_irq_safe(&pdev->dev); 1739 pm_runtime_enable(&pdev->dev); 1740 1741 pm_runtime_get_sync(&pdev->dev); 1742 1743 omap_serial_fill_features_erratas(up); 1744 1745 ui[up->port.line] = up; 1746 serial_omap_add_console_port(up); 1747 1748 ret = uart_add_one_port(&serial_omap_reg, &up->port); 1749 if (ret != 0) 1750 goto err_add_port; 1751 1752 pm_runtime_mark_last_busy(up->dev); 1753 pm_runtime_put_autosuspend(up->dev); 1754 return 0; 1755 1756 err_add_port: 1757 pm_runtime_dont_use_autosuspend(&pdev->dev); 1758 pm_runtime_put_sync(&pdev->dev); 1759 pm_runtime_disable(&pdev->dev); 1760 pm_qos_remove_request(&up->pm_qos_request); 1761 device_init_wakeup(up->dev, false); 1762 err_rs485: 1763 err_port_line: 1764 return ret; 1765 } 1766 1767 static int serial_omap_remove(struct platform_device *dev) 1768 { 1769 struct uart_omap_port *up = platform_get_drvdata(dev); 1770 1771 pm_runtime_get_sync(up->dev); 1772 1773 uart_remove_one_port(&serial_omap_reg, &up->port); 1774 1775 pm_runtime_dont_use_autosuspend(up->dev); 1776 pm_runtime_put_sync(up->dev); 1777 pm_runtime_disable(up->dev); 1778 pm_qos_remove_request(&up->pm_qos_request); 1779 device_init_wakeup(&dev->dev, false); 1780 1781 return 0; 1782 } 1783 1784 /* 1785 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) 1786 * The access to uart register after MDR1 Access 1787 * causes UART to corrupt data. 1788 * 1789 * Need a delay = 1790 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) 1791 * give 10 times as much 1792 */ 1793 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1) 1794 { 1795 u8 timeout = 255; 1796 1797 serial_out(up, UART_OMAP_MDR1, mdr1); 1798 udelay(2); 1799 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | 1800 UART_FCR_CLEAR_RCVR); 1801 /* 1802 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and 1803 * TX_FIFO_E bit is 1. 1804 */ 1805 while (UART_LSR_THRE != (serial_in(up, UART_LSR) & 1806 (UART_LSR_THRE | UART_LSR_DR))) { 1807 timeout--; 1808 if (!timeout) { 1809 /* Should *never* happen. we warn and carry on */ 1810 dev_crit(up->dev, "Errata i202: timedout %x\n", 1811 serial_in(up, UART_LSR)); 1812 break; 1813 } 1814 udelay(1); 1815 } 1816 } 1817 1818 #ifdef CONFIG_PM 1819 static void serial_omap_restore_context(struct uart_omap_port *up) 1820 { 1821 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1822 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE); 1823 else 1824 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); 1825 1826 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1827 serial_out(up, UART_EFR, UART_EFR_ECB); 1828 serial_out(up, UART_LCR, 0x0); /* Operational mode */ 1829 serial_out(up, UART_IER, 0x0); 1830 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1831 serial_out(up, UART_DLL, up->dll); 1832 serial_out(up, UART_DLM, up->dlh); 1833 serial_out(up, UART_LCR, 0x0); /* Operational mode */ 1834 serial_out(up, UART_IER, up->ier); 1835 serial_out(up, UART_FCR, up->fcr); 1836 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 1837 serial_out(up, UART_MCR, up->mcr); 1838 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */ 1839 serial_out(up, UART_OMAP_SCR, up->scr); 1840 serial_out(up, UART_EFR, up->efr); 1841 serial_out(up, UART_LCR, up->lcr); 1842 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS) 1843 serial_omap_mdr1_errataset(up, up->mdr1); 1844 else 1845 serial_out(up, UART_OMAP_MDR1, up->mdr1); 1846 serial_out(up, UART_OMAP_WER, up->wer); 1847 } 1848 1849 static int serial_omap_runtime_suspend(struct device *dev) 1850 { 1851 struct uart_omap_port *up = dev_get_drvdata(dev); 1852 1853 if (!up) 1854 return -EINVAL; 1855 1856 /* 1857 * When using 'no_console_suspend', the console UART must not be 1858 * suspended. Since driver suspend is managed by runtime suspend, 1859 * preventing runtime suspend (by returning error) will keep device 1860 * active during suspend. 1861 */ 1862 if (up->is_suspending && !console_suspend_enabled && 1863 uart_console(&up->port)) 1864 return -EBUSY; 1865 1866 up->context_loss_cnt = serial_omap_get_context_loss_count(up); 1867 1868 serial_omap_enable_wakeup(up, true); 1869 1870 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; 1871 schedule_work(&up->qos_work); 1872 1873 return 0; 1874 } 1875 1876 static int serial_omap_runtime_resume(struct device *dev) 1877 { 1878 struct uart_omap_port *up = dev_get_drvdata(dev); 1879 1880 int loss_cnt = serial_omap_get_context_loss_count(up); 1881 1882 serial_omap_enable_wakeup(up, false); 1883 1884 if (loss_cnt < 0) { 1885 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n", 1886 loss_cnt); 1887 serial_omap_restore_context(up); 1888 } else if (up->context_loss_cnt != loss_cnt) { 1889 serial_omap_restore_context(up); 1890 } 1891 up->latency = up->calc_latency; 1892 schedule_work(&up->qos_work); 1893 1894 return 0; 1895 } 1896 #endif 1897 1898 static const struct dev_pm_ops serial_omap_dev_pm_ops = { 1899 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) 1900 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, 1901 serial_omap_runtime_resume, NULL) 1902 .prepare = serial_omap_prepare, 1903 .complete = serial_omap_complete, 1904 }; 1905 1906 #if defined(CONFIG_OF) 1907 static const struct of_device_id omap_serial_of_match[] = { 1908 { .compatible = "ti,omap2-uart" }, 1909 { .compatible = "ti,omap3-uart" }, 1910 { .compatible = "ti,omap4-uart" }, 1911 {}, 1912 }; 1913 MODULE_DEVICE_TABLE(of, omap_serial_of_match); 1914 #endif 1915 1916 static struct platform_driver serial_omap_driver = { 1917 .probe = serial_omap_probe, 1918 .remove = serial_omap_remove, 1919 .driver = { 1920 .name = OMAP_SERIAL_DRIVER_NAME, 1921 .pm = &serial_omap_dev_pm_ops, 1922 .of_match_table = of_match_ptr(omap_serial_of_match), 1923 }, 1924 }; 1925 1926 static int __init serial_omap_init(void) 1927 { 1928 int ret; 1929 1930 ret = uart_register_driver(&serial_omap_reg); 1931 if (ret != 0) 1932 return ret; 1933 ret = platform_driver_register(&serial_omap_driver); 1934 if (ret != 0) 1935 uart_unregister_driver(&serial_omap_reg); 1936 return ret; 1937 } 1938 1939 static void __exit serial_omap_exit(void) 1940 { 1941 platform_driver_unregister(&serial_omap_driver); 1942 uart_unregister_driver(&serial_omap_reg); 1943 } 1944 1945 module_init(serial_omap_init); 1946 module_exit(serial_omap_exit); 1947 1948 MODULE_DESCRIPTION("OMAP High Speed UART driver"); 1949 MODULE_LICENSE("GPL"); 1950 MODULE_AUTHOR("Texas Instruments Inc"); 1951