1 /* 2 * Based on drivers/serial/8250.c by Russell King. 3 * 4 * Author: Nicolas Pitre 5 * Created: Feb 20, 2003 6 * Copyright: (C) 2003 Monta Vista Software, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * Note 1: This driver is made separate from the already too overloaded 14 * 8250.c because it needs some kirks of its own and that'll make it 15 * easier to add DMA support. 16 * 17 * Note 2: I'm too sick of device allocation policies for serial ports. 18 * If someone else wants to request an "official" allocation of major/minor 19 * for this driver please be my guest. And don't forget that new hardware 20 * to come from Intel might have more than 3 or 4 of those UARTs. Let's 21 * hope for a better port registration and dynamic device allocation scheme 22 * with the serial core maintainer satisfaction to appear soon. 23 */ 24 25 26 #if defined(CONFIG_SERIAL_PXA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) 27 #define SUPPORT_SYSRQ 28 #endif 29 30 #include <linux/module.h> 31 #include <linux/ioport.h> 32 #include <linux/init.h> 33 #include <linux/console.h> 34 #include <linux/sysrq.h> 35 #include <linux/serial_reg.h> 36 #include <linux/circ_buf.h> 37 #include <linux/delay.h> 38 #include <linux/interrupt.h> 39 #include <linux/of.h> 40 #include <linux/platform_device.h> 41 #include <linux/tty.h> 42 #include <linux/tty_flip.h> 43 #include <linux/serial_core.h> 44 #include <linux/clk.h> 45 #include <linux/io.h> 46 #include <linux/slab.h> 47 48 #define PXA_NAME_LEN 8 49 50 struct uart_pxa_port { 51 struct uart_port port; 52 unsigned char ier; 53 unsigned char lcr; 54 unsigned char mcr; 55 unsigned int lsr_break_flag; 56 struct clk *clk; 57 char name[PXA_NAME_LEN]; 58 }; 59 60 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset) 61 { 62 offset <<= 2; 63 return readl(up->port.membase + offset); 64 } 65 66 static inline void serial_out(struct uart_pxa_port *up, int offset, int value) 67 { 68 offset <<= 2; 69 writel(value, up->port.membase + offset); 70 } 71 72 static void serial_pxa_enable_ms(struct uart_port *port) 73 { 74 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 75 76 up->ier |= UART_IER_MSI; 77 serial_out(up, UART_IER, up->ier); 78 } 79 80 static void serial_pxa_stop_tx(struct uart_port *port) 81 { 82 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 83 84 if (up->ier & UART_IER_THRI) { 85 up->ier &= ~UART_IER_THRI; 86 serial_out(up, UART_IER, up->ier); 87 } 88 } 89 90 static void serial_pxa_stop_rx(struct uart_port *port) 91 { 92 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 93 94 up->ier &= ~UART_IER_RLSI; 95 up->port.read_status_mask &= ~UART_LSR_DR; 96 serial_out(up, UART_IER, up->ier); 97 } 98 99 static inline void receive_chars(struct uart_pxa_port *up, int *status) 100 { 101 unsigned int ch, flag; 102 int max_count = 256; 103 104 do { 105 /* work around Errata #20 according to 106 * Intel(R) PXA27x Processor Family 107 * Specification Update (May 2005) 108 * 109 * Step 2 110 * Disable the Reciever Time Out Interrupt via IER[RTOEI] 111 */ 112 up->ier &= ~UART_IER_RTOIE; 113 serial_out(up, UART_IER, up->ier); 114 115 ch = serial_in(up, UART_RX); 116 flag = TTY_NORMAL; 117 up->port.icount.rx++; 118 119 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | 120 UART_LSR_FE | UART_LSR_OE))) { 121 /* 122 * For statistics only 123 */ 124 if (*status & UART_LSR_BI) { 125 *status &= ~(UART_LSR_FE | UART_LSR_PE); 126 up->port.icount.brk++; 127 /* 128 * We do the SysRQ and SAK checking 129 * here because otherwise the break 130 * may get masked by ignore_status_mask 131 * or read_status_mask. 132 */ 133 if (uart_handle_break(&up->port)) 134 goto ignore_char; 135 } else if (*status & UART_LSR_PE) 136 up->port.icount.parity++; 137 else if (*status & UART_LSR_FE) 138 up->port.icount.frame++; 139 if (*status & UART_LSR_OE) 140 up->port.icount.overrun++; 141 142 /* 143 * Mask off conditions which should be ignored. 144 */ 145 *status &= up->port.read_status_mask; 146 147 #ifdef CONFIG_SERIAL_PXA_CONSOLE 148 if (up->port.line == up->port.cons->index) { 149 /* Recover the break flag from console xmit */ 150 *status |= up->lsr_break_flag; 151 up->lsr_break_flag = 0; 152 } 153 #endif 154 if (*status & UART_LSR_BI) { 155 flag = TTY_BREAK; 156 } else if (*status & UART_LSR_PE) 157 flag = TTY_PARITY; 158 else if (*status & UART_LSR_FE) 159 flag = TTY_FRAME; 160 } 161 162 if (uart_handle_sysrq_char(&up->port, ch)) 163 goto ignore_char; 164 165 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag); 166 167 ignore_char: 168 *status = serial_in(up, UART_LSR); 169 } while ((*status & UART_LSR_DR) && (max_count-- > 0)); 170 tty_flip_buffer_push(&up->port.state->port); 171 172 /* work around Errata #20 according to 173 * Intel(R) PXA27x Processor Family 174 * Specification Update (May 2005) 175 * 176 * Step 6: 177 * No more data in FIFO: Re-enable RTO interrupt via IER[RTOIE] 178 */ 179 up->ier |= UART_IER_RTOIE; 180 serial_out(up, UART_IER, up->ier); 181 } 182 183 static void transmit_chars(struct uart_pxa_port *up) 184 { 185 struct circ_buf *xmit = &up->port.state->xmit; 186 int count; 187 188 if (up->port.x_char) { 189 serial_out(up, UART_TX, up->port.x_char); 190 up->port.icount.tx++; 191 up->port.x_char = 0; 192 return; 193 } 194 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { 195 serial_pxa_stop_tx(&up->port); 196 return; 197 } 198 199 count = up->port.fifosize / 2; 200 do { 201 serial_out(up, UART_TX, xmit->buf[xmit->tail]); 202 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 203 up->port.icount.tx++; 204 if (uart_circ_empty(xmit)) 205 break; 206 } while (--count > 0); 207 208 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 209 uart_write_wakeup(&up->port); 210 211 212 if (uart_circ_empty(xmit)) 213 serial_pxa_stop_tx(&up->port); 214 } 215 216 static void serial_pxa_start_tx(struct uart_port *port) 217 { 218 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 219 220 if (!(up->ier & UART_IER_THRI)) { 221 up->ier |= UART_IER_THRI; 222 serial_out(up, UART_IER, up->ier); 223 } 224 } 225 226 /* should hold up->port.lock */ 227 static inline void check_modem_status(struct uart_pxa_port *up) 228 { 229 int status; 230 231 status = serial_in(up, UART_MSR); 232 233 if ((status & UART_MSR_ANY_DELTA) == 0) 234 return; 235 236 if (status & UART_MSR_TERI) 237 up->port.icount.rng++; 238 if (status & UART_MSR_DDSR) 239 up->port.icount.dsr++; 240 if (status & UART_MSR_DDCD) 241 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); 242 if (status & UART_MSR_DCTS) 243 uart_handle_cts_change(&up->port, status & UART_MSR_CTS); 244 245 wake_up_interruptible(&up->port.state->port.delta_msr_wait); 246 } 247 248 /* 249 * This handles the interrupt from one port. 250 */ 251 static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id) 252 { 253 struct uart_pxa_port *up = dev_id; 254 unsigned int iir, lsr; 255 256 iir = serial_in(up, UART_IIR); 257 if (iir & UART_IIR_NO_INT) 258 return IRQ_NONE; 259 spin_lock(&up->port.lock); 260 lsr = serial_in(up, UART_LSR); 261 if (lsr & UART_LSR_DR) 262 receive_chars(up, &lsr); 263 check_modem_status(up); 264 if (lsr & UART_LSR_THRE) 265 transmit_chars(up); 266 spin_unlock(&up->port.lock); 267 return IRQ_HANDLED; 268 } 269 270 static unsigned int serial_pxa_tx_empty(struct uart_port *port) 271 { 272 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 273 unsigned long flags; 274 unsigned int ret; 275 276 spin_lock_irqsave(&up->port.lock, flags); 277 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; 278 spin_unlock_irqrestore(&up->port.lock, flags); 279 280 return ret; 281 } 282 283 static unsigned int serial_pxa_get_mctrl(struct uart_port *port) 284 { 285 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 286 unsigned char status; 287 unsigned int ret; 288 289 status = serial_in(up, UART_MSR); 290 291 ret = 0; 292 if (status & UART_MSR_DCD) 293 ret |= TIOCM_CAR; 294 if (status & UART_MSR_RI) 295 ret |= TIOCM_RNG; 296 if (status & UART_MSR_DSR) 297 ret |= TIOCM_DSR; 298 if (status & UART_MSR_CTS) 299 ret |= TIOCM_CTS; 300 return ret; 301 } 302 303 static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl) 304 { 305 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 306 unsigned char mcr = 0; 307 308 if (mctrl & TIOCM_RTS) 309 mcr |= UART_MCR_RTS; 310 if (mctrl & TIOCM_DTR) 311 mcr |= UART_MCR_DTR; 312 if (mctrl & TIOCM_OUT1) 313 mcr |= UART_MCR_OUT1; 314 if (mctrl & TIOCM_OUT2) 315 mcr |= UART_MCR_OUT2; 316 if (mctrl & TIOCM_LOOP) 317 mcr |= UART_MCR_LOOP; 318 319 mcr |= up->mcr; 320 321 serial_out(up, UART_MCR, mcr); 322 } 323 324 static void serial_pxa_break_ctl(struct uart_port *port, int break_state) 325 { 326 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 327 unsigned long flags; 328 329 spin_lock_irqsave(&up->port.lock, flags); 330 if (break_state == -1) 331 up->lcr |= UART_LCR_SBC; 332 else 333 up->lcr &= ~UART_LCR_SBC; 334 serial_out(up, UART_LCR, up->lcr); 335 spin_unlock_irqrestore(&up->port.lock, flags); 336 } 337 338 static int serial_pxa_startup(struct uart_port *port) 339 { 340 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 341 unsigned long flags; 342 int retval; 343 344 if (port->line == 3) /* HWUART */ 345 up->mcr |= UART_MCR_AFE; 346 else 347 up->mcr = 0; 348 349 up->port.uartclk = clk_get_rate(up->clk); 350 351 /* 352 * Allocate the IRQ 353 */ 354 retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up); 355 if (retval) 356 return retval; 357 358 /* 359 * Clear the FIFO buffers and disable them. 360 * (they will be reenabled in set_termios()) 361 */ 362 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 363 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 364 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 365 serial_out(up, UART_FCR, 0); 366 367 /* 368 * Clear the interrupt registers. 369 */ 370 (void) serial_in(up, UART_LSR); 371 (void) serial_in(up, UART_RX); 372 (void) serial_in(up, UART_IIR); 373 (void) serial_in(up, UART_MSR); 374 375 /* 376 * Now, initialize the UART 377 */ 378 serial_out(up, UART_LCR, UART_LCR_WLEN8); 379 380 spin_lock_irqsave(&up->port.lock, flags); 381 up->port.mctrl |= TIOCM_OUT2; 382 serial_pxa_set_mctrl(&up->port, up->port.mctrl); 383 spin_unlock_irqrestore(&up->port.lock, flags); 384 385 /* 386 * Finally, enable interrupts. Note: Modem status interrupts 387 * are set via set_termios(), which will be occurring imminently 388 * anyway, so we don't enable them here. 389 */ 390 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE; 391 serial_out(up, UART_IER, up->ier); 392 393 /* 394 * And clear the interrupt registers again for luck. 395 */ 396 (void) serial_in(up, UART_LSR); 397 (void) serial_in(up, UART_RX); 398 (void) serial_in(up, UART_IIR); 399 (void) serial_in(up, UART_MSR); 400 401 return 0; 402 } 403 404 static void serial_pxa_shutdown(struct uart_port *port) 405 { 406 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 407 unsigned long flags; 408 409 free_irq(up->port.irq, up); 410 411 /* 412 * Disable interrupts from this port 413 */ 414 up->ier = 0; 415 serial_out(up, UART_IER, 0); 416 417 spin_lock_irqsave(&up->port.lock, flags); 418 up->port.mctrl &= ~TIOCM_OUT2; 419 serial_pxa_set_mctrl(&up->port, up->port.mctrl); 420 spin_unlock_irqrestore(&up->port.lock, flags); 421 422 /* 423 * Disable break condition and FIFOs 424 */ 425 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); 426 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 427 UART_FCR_CLEAR_RCVR | 428 UART_FCR_CLEAR_XMIT); 429 serial_out(up, UART_FCR, 0); 430 } 431 432 static void 433 serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios, 434 struct ktermios *old) 435 { 436 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 437 unsigned char cval, fcr = 0; 438 unsigned long flags; 439 unsigned int baud, quot; 440 unsigned int dll; 441 442 switch (termios->c_cflag & CSIZE) { 443 case CS5: 444 cval = UART_LCR_WLEN5; 445 break; 446 case CS6: 447 cval = UART_LCR_WLEN6; 448 break; 449 case CS7: 450 cval = UART_LCR_WLEN7; 451 break; 452 default: 453 case CS8: 454 cval = UART_LCR_WLEN8; 455 break; 456 } 457 458 if (termios->c_cflag & CSTOPB) 459 cval |= UART_LCR_STOP; 460 if (termios->c_cflag & PARENB) 461 cval |= UART_LCR_PARITY; 462 if (!(termios->c_cflag & PARODD)) 463 cval |= UART_LCR_EPAR; 464 465 /* 466 * Ask the core to calculate the divisor for us. 467 */ 468 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 469 quot = uart_get_divisor(port, baud); 470 471 if ((up->port.uartclk / quot) < (2400 * 16)) 472 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1; 473 else if ((up->port.uartclk / quot) < (230400 * 16)) 474 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8; 475 else 476 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32; 477 478 /* 479 * Ok, we're now changing the port state. Do it with 480 * interrupts disabled. 481 */ 482 spin_lock_irqsave(&up->port.lock, flags); 483 484 /* 485 * Ensure the port will be enabled. 486 * This is required especially for serial console. 487 */ 488 up->ier |= UART_IER_UUE; 489 490 /* 491 * Update the per-port timeout. 492 */ 493 uart_update_timeout(port, termios->c_cflag, baud); 494 495 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 496 if (termios->c_iflag & INPCK) 497 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; 498 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) 499 up->port.read_status_mask |= UART_LSR_BI; 500 501 /* 502 * Characters to ignore 503 */ 504 up->port.ignore_status_mask = 0; 505 if (termios->c_iflag & IGNPAR) 506 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 507 if (termios->c_iflag & IGNBRK) { 508 up->port.ignore_status_mask |= UART_LSR_BI; 509 /* 510 * If we're ignoring parity and break indicators, 511 * ignore overruns too (for real raw support). 512 */ 513 if (termios->c_iflag & IGNPAR) 514 up->port.ignore_status_mask |= UART_LSR_OE; 515 } 516 517 /* 518 * ignore all characters if CREAD is not set 519 */ 520 if ((termios->c_cflag & CREAD) == 0) 521 up->port.ignore_status_mask |= UART_LSR_DR; 522 523 /* 524 * CTS flow control flag and modem status interrupts 525 */ 526 up->ier &= ~UART_IER_MSI; 527 if (UART_ENABLE_MS(&up->port, termios->c_cflag)) 528 up->ier |= UART_IER_MSI; 529 530 serial_out(up, UART_IER, up->ier); 531 532 if (termios->c_cflag & CRTSCTS) 533 up->mcr |= UART_MCR_AFE; 534 else 535 up->mcr &= ~UART_MCR_AFE; 536 537 serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */ 538 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ 539 540 /* 541 * work around Errata #75 according to Intel(R) PXA27x Processor Family 542 * Specification Update (Nov 2005) 543 */ 544 dll = serial_in(up, UART_DLL); 545 WARN_ON(dll != (quot & 0xff)); 546 547 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */ 548 serial_out(up, UART_LCR, cval); /* reset DLAB */ 549 up->lcr = cval; /* Save LCR */ 550 serial_pxa_set_mctrl(&up->port, up->port.mctrl); 551 serial_out(up, UART_FCR, fcr); 552 spin_unlock_irqrestore(&up->port.lock, flags); 553 } 554 555 static void 556 serial_pxa_pm(struct uart_port *port, unsigned int state, 557 unsigned int oldstate) 558 { 559 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 560 561 if (!state) 562 clk_prepare_enable(up->clk); 563 else 564 clk_disable_unprepare(up->clk); 565 } 566 567 static void serial_pxa_release_port(struct uart_port *port) 568 { 569 } 570 571 static int serial_pxa_request_port(struct uart_port *port) 572 { 573 return 0; 574 } 575 576 static void serial_pxa_config_port(struct uart_port *port, int flags) 577 { 578 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 579 up->port.type = PORT_PXA; 580 } 581 582 static int 583 serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser) 584 { 585 /* we don't want the core code to modify any port params */ 586 return -EINVAL; 587 } 588 589 static const char * 590 serial_pxa_type(struct uart_port *port) 591 { 592 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 593 return up->name; 594 } 595 596 static struct uart_pxa_port *serial_pxa_ports[4]; 597 static struct uart_driver serial_pxa_reg; 598 599 #ifdef CONFIG_SERIAL_PXA_CONSOLE 600 601 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 602 603 /* 604 * Wait for transmitter & holding register to empty 605 */ 606 static void wait_for_xmitr(struct uart_pxa_port *up) 607 { 608 unsigned int status, tmout = 10000; 609 610 /* Wait up to 10ms for the character(s) to be sent. */ 611 do { 612 status = serial_in(up, UART_LSR); 613 614 if (status & UART_LSR_BI) 615 up->lsr_break_flag = UART_LSR_BI; 616 617 if (--tmout == 0) 618 break; 619 udelay(1); 620 } while ((status & BOTH_EMPTY) != BOTH_EMPTY); 621 622 /* Wait up to 1s for flow control if necessary */ 623 if (up->port.flags & UPF_CONS_FLOW) { 624 tmout = 1000000; 625 while (--tmout && 626 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) 627 udelay(1); 628 } 629 } 630 631 static void serial_pxa_console_putchar(struct uart_port *port, int ch) 632 { 633 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 634 635 wait_for_xmitr(up); 636 serial_out(up, UART_TX, ch); 637 } 638 639 /* 640 * Print a string to the serial port trying not to disturb 641 * any possible real use of the port... 642 * 643 * The console_lock must be held when we get here. 644 */ 645 static void 646 serial_pxa_console_write(struct console *co, const char *s, unsigned int count) 647 { 648 struct uart_pxa_port *up = serial_pxa_ports[co->index]; 649 unsigned int ier; 650 unsigned long flags; 651 int locked = 1; 652 653 clk_enable(up->clk); 654 local_irq_save(flags); 655 if (up->port.sysrq) 656 locked = 0; 657 else if (oops_in_progress) 658 locked = spin_trylock(&up->port.lock); 659 else 660 spin_lock(&up->port.lock); 661 662 /* 663 * First save the IER then disable the interrupts 664 */ 665 ier = serial_in(up, UART_IER); 666 serial_out(up, UART_IER, UART_IER_UUE); 667 668 uart_console_write(&up->port, s, count, serial_pxa_console_putchar); 669 670 /* 671 * Finally, wait for transmitter to become empty 672 * and restore the IER 673 */ 674 wait_for_xmitr(up); 675 serial_out(up, UART_IER, ier); 676 677 if (locked) 678 spin_unlock(&up->port.lock); 679 local_irq_restore(flags); 680 clk_disable(up->clk); 681 682 } 683 684 #ifdef CONFIG_CONSOLE_POLL 685 /* 686 * Console polling routines for writing and reading from the uart while 687 * in an interrupt or debug context. 688 */ 689 690 static int serial_pxa_get_poll_char(struct uart_port *port) 691 { 692 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 693 unsigned char lsr = serial_in(up, UART_LSR); 694 695 while (!(lsr & UART_LSR_DR)) 696 lsr = serial_in(up, UART_LSR); 697 698 return serial_in(up, UART_RX); 699 } 700 701 702 static void serial_pxa_put_poll_char(struct uart_port *port, 703 unsigned char c) 704 { 705 unsigned int ier; 706 struct uart_pxa_port *up = (struct uart_pxa_port *)port; 707 708 /* 709 * First save the IER then disable the interrupts 710 */ 711 ier = serial_in(up, UART_IER); 712 serial_out(up, UART_IER, UART_IER_UUE); 713 714 wait_for_xmitr(up); 715 /* 716 * Send the character out. 717 */ 718 serial_out(up, UART_TX, c); 719 720 /* 721 * Finally, wait for transmitter to become empty 722 * and restore the IER 723 */ 724 wait_for_xmitr(up); 725 serial_out(up, UART_IER, ier); 726 } 727 728 #endif /* CONFIG_CONSOLE_POLL */ 729 730 static int __init 731 serial_pxa_console_setup(struct console *co, char *options) 732 { 733 struct uart_pxa_port *up; 734 int baud = 9600; 735 int bits = 8; 736 int parity = 'n'; 737 int flow = 'n'; 738 739 if (co->index == -1 || co->index >= serial_pxa_reg.nr) 740 co->index = 0; 741 up = serial_pxa_ports[co->index]; 742 if (!up) 743 return -ENODEV; 744 745 if (options) 746 uart_parse_options(options, &baud, &parity, &bits, &flow); 747 748 return uart_set_options(&up->port, co, baud, parity, bits, flow); 749 } 750 751 static struct console serial_pxa_console = { 752 .name = "ttyS", 753 .write = serial_pxa_console_write, 754 .device = uart_console_device, 755 .setup = serial_pxa_console_setup, 756 .flags = CON_PRINTBUFFER, 757 .index = -1, 758 .data = &serial_pxa_reg, 759 }; 760 761 #define PXA_CONSOLE &serial_pxa_console 762 #else 763 #define PXA_CONSOLE NULL 764 #endif 765 766 static struct uart_ops serial_pxa_pops = { 767 .tx_empty = serial_pxa_tx_empty, 768 .set_mctrl = serial_pxa_set_mctrl, 769 .get_mctrl = serial_pxa_get_mctrl, 770 .stop_tx = serial_pxa_stop_tx, 771 .start_tx = serial_pxa_start_tx, 772 .stop_rx = serial_pxa_stop_rx, 773 .enable_ms = serial_pxa_enable_ms, 774 .break_ctl = serial_pxa_break_ctl, 775 .startup = serial_pxa_startup, 776 .shutdown = serial_pxa_shutdown, 777 .set_termios = serial_pxa_set_termios, 778 .pm = serial_pxa_pm, 779 .type = serial_pxa_type, 780 .release_port = serial_pxa_release_port, 781 .request_port = serial_pxa_request_port, 782 .config_port = serial_pxa_config_port, 783 .verify_port = serial_pxa_verify_port, 784 #if defined(CONFIG_CONSOLE_POLL) && defined(CONFIG_SERIAL_PXA_CONSOLE) 785 .poll_get_char = serial_pxa_get_poll_char, 786 .poll_put_char = serial_pxa_put_poll_char, 787 #endif 788 }; 789 790 static struct uart_driver serial_pxa_reg = { 791 .owner = THIS_MODULE, 792 .driver_name = "PXA serial", 793 .dev_name = "ttyS", 794 .major = TTY_MAJOR, 795 .minor = 64, 796 .nr = 4, 797 .cons = PXA_CONSOLE, 798 }; 799 800 #ifdef CONFIG_PM 801 static int serial_pxa_suspend(struct device *dev) 802 { 803 struct uart_pxa_port *sport = dev_get_drvdata(dev); 804 805 if (sport) 806 uart_suspend_port(&serial_pxa_reg, &sport->port); 807 808 return 0; 809 } 810 811 static int serial_pxa_resume(struct device *dev) 812 { 813 struct uart_pxa_port *sport = dev_get_drvdata(dev); 814 815 if (sport) 816 uart_resume_port(&serial_pxa_reg, &sport->port); 817 818 return 0; 819 } 820 821 static const struct dev_pm_ops serial_pxa_pm_ops = { 822 .suspend = serial_pxa_suspend, 823 .resume = serial_pxa_resume, 824 }; 825 #endif 826 827 static const struct of_device_id serial_pxa_dt_ids[] = { 828 { .compatible = "mrvl,pxa-uart", }, 829 { .compatible = "mrvl,mmp-uart", }, 830 {} 831 }; 832 MODULE_DEVICE_TABLE(of, serial_pxa_dt_ids); 833 834 static int serial_pxa_probe_dt(struct platform_device *pdev, 835 struct uart_pxa_port *sport) 836 { 837 struct device_node *np = pdev->dev.of_node; 838 int ret; 839 840 if (!np) 841 return 1; 842 843 ret = of_alias_get_id(np, "serial"); 844 if (ret < 0) { 845 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); 846 return ret; 847 } 848 sport->port.line = ret; 849 return 0; 850 } 851 852 static int serial_pxa_probe(struct platform_device *dev) 853 { 854 struct uart_pxa_port *sport; 855 struct resource *mmres, *irqres; 856 int ret; 857 858 mmres = platform_get_resource(dev, IORESOURCE_MEM, 0); 859 irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0); 860 if (!mmres || !irqres) 861 return -ENODEV; 862 863 sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL); 864 if (!sport) 865 return -ENOMEM; 866 867 sport->clk = clk_get(&dev->dev, NULL); 868 if (IS_ERR(sport->clk)) { 869 ret = PTR_ERR(sport->clk); 870 goto err_free; 871 } 872 873 ret = clk_prepare(sport->clk); 874 if (ret) { 875 clk_put(sport->clk); 876 goto err_free; 877 } 878 879 sport->port.type = PORT_PXA; 880 sport->port.iotype = UPIO_MEM; 881 sport->port.mapbase = mmres->start; 882 sport->port.irq = irqres->start; 883 sport->port.fifosize = 64; 884 sport->port.ops = &serial_pxa_pops; 885 sport->port.dev = &dev->dev; 886 sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; 887 sport->port.uartclk = clk_get_rate(sport->clk); 888 889 ret = serial_pxa_probe_dt(dev, sport); 890 if (ret > 0) 891 sport->port.line = dev->id; 892 else if (ret < 0) 893 goto err_clk; 894 snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1); 895 896 sport->port.membase = ioremap(mmres->start, resource_size(mmres)); 897 if (!sport->port.membase) { 898 ret = -ENOMEM; 899 goto err_clk; 900 } 901 902 serial_pxa_ports[sport->port.line] = sport; 903 904 uart_add_one_port(&serial_pxa_reg, &sport->port); 905 platform_set_drvdata(dev, sport); 906 907 return 0; 908 909 err_clk: 910 clk_unprepare(sport->clk); 911 clk_put(sport->clk); 912 err_free: 913 kfree(sport); 914 return ret; 915 } 916 917 static int serial_pxa_remove(struct platform_device *dev) 918 { 919 struct uart_pxa_port *sport = platform_get_drvdata(dev); 920 921 uart_remove_one_port(&serial_pxa_reg, &sport->port); 922 923 clk_unprepare(sport->clk); 924 clk_put(sport->clk); 925 kfree(sport); 926 927 return 0; 928 } 929 930 static struct platform_driver serial_pxa_driver = { 931 .probe = serial_pxa_probe, 932 .remove = serial_pxa_remove, 933 934 .driver = { 935 .name = "pxa2xx-uart", 936 #ifdef CONFIG_PM 937 .pm = &serial_pxa_pm_ops, 938 #endif 939 .of_match_table = serial_pxa_dt_ids, 940 }, 941 }; 942 943 static int __init serial_pxa_init(void) 944 { 945 int ret; 946 947 ret = uart_register_driver(&serial_pxa_reg); 948 if (ret != 0) 949 return ret; 950 951 ret = platform_driver_register(&serial_pxa_driver); 952 if (ret != 0) 953 uart_unregister_driver(&serial_pxa_reg); 954 955 return ret; 956 } 957 958 static void __exit serial_pxa_exit(void) 959 { 960 platform_driver_unregister(&serial_pxa_driver); 961 uart_unregister_driver(&serial_pxa_reg); 962 } 963 964 module_init(serial_pxa_init); 965 module_exit(serial_pxa_exit); 966 967 MODULE_LICENSE("GPL"); 968 MODULE_ALIAS("platform:pxa2xx-uart"); 969