1 /* 2 * Atheros AR933X SoC built-in UART driver 3 * 4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org> 5 * 6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 as published 10 * by the Free Software Foundation. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/ioport.h> 15 #include <linux/init.h> 16 #include <linux/console.h> 17 #include <linux/sysrq.h> 18 #include <linux/delay.h> 19 #include <linux/platform_device.h> 20 #include <linux/tty.h> 21 #include <linux/tty_flip.h> 22 #include <linux/serial_core.h> 23 #include <linux/serial.h> 24 #include <linux/slab.h> 25 #include <linux/io.h> 26 #include <linux/irq.h> 27 28 #include <asm/div64.h> 29 30 #include <asm/mach-ath79/ar933x_uart.h> 31 #include <asm/mach-ath79/ar933x_uart_platform.h> 32 33 #define DRIVER_NAME "ar933x-uart" 34 35 #define AR933X_UART_MAX_SCALE 0xff 36 #define AR933X_UART_MAX_STEP 0xffff 37 38 #define AR933X_UART_MIN_BAUD 300 39 #define AR933X_UART_MAX_BAUD 3000000 40 41 #define AR933X_DUMMY_STATUS_RD 0x01 42 43 static struct uart_driver ar933x_uart_driver; 44 45 struct ar933x_uart_port { 46 struct uart_port port; 47 unsigned int ier; /* shadow Interrupt Enable Register */ 48 unsigned int min_baud; 49 unsigned int max_baud; 50 }; 51 52 static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up, 53 int offset) 54 { 55 return readl(up->port.membase + offset); 56 } 57 58 static inline void ar933x_uart_write(struct ar933x_uart_port *up, 59 int offset, unsigned int value) 60 { 61 writel(value, up->port.membase + offset); 62 } 63 64 static inline void ar933x_uart_rmw(struct ar933x_uart_port *up, 65 unsigned int offset, 66 unsigned int mask, 67 unsigned int val) 68 { 69 unsigned int t; 70 71 t = ar933x_uart_read(up, offset); 72 t &= ~mask; 73 t |= val; 74 ar933x_uart_write(up, offset, t); 75 } 76 77 static inline void ar933x_uart_rmw_set(struct ar933x_uart_port *up, 78 unsigned int offset, 79 unsigned int val) 80 { 81 ar933x_uart_rmw(up, offset, 0, val); 82 } 83 84 static inline void ar933x_uart_rmw_clear(struct ar933x_uart_port *up, 85 unsigned int offset, 86 unsigned int val) 87 { 88 ar933x_uart_rmw(up, offset, val, 0); 89 } 90 91 static inline void ar933x_uart_start_tx_interrupt(struct ar933x_uart_port *up) 92 { 93 up->ier |= AR933X_UART_INT_TX_EMPTY; 94 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); 95 } 96 97 static inline void ar933x_uart_stop_tx_interrupt(struct ar933x_uart_port *up) 98 { 99 up->ier &= ~AR933X_UART_INT_TX_EMPTY; 100 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); 101 } 102 103 static inline void ar933x_uart_putc(struct ar933x_uart_port *up, int ch) 104 { 105 unsigned int rdata; 106 107 rdata = ch & AR933X_UART_DATA_TX_RX_MASK; 108 rdata |= AR933X_UART_DATA_TX_CSR; 109 ar933x_uart_write(up, AR933X_UART_DATA_REG, rdata); 110 } 111 112 static unsigned int ar933x_uart_tx_empty(struct uart_port *port) 113 { 114 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 115 unsigned long flags; 116 unsigned int rdata; 117 118 spin_lock_irqsave(&up->port.lock, flags); 119 rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); 120 spin_unlock_irqrestore(&up->port.lock, flags); 121 122 return (rdata & AR933X_UART_DATA_TX_CSR) ? 0 : TIOCSER_TEMT; 123 } 124 125 static unsigned int ar933x_uart_get_mctrl(struct uart_port *port) 126 { 127 return TIOCM_CAR; 128 } 129 130 static void ar933x_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) 131 { 132 } 133 134 static void ar933x_uart_start_tx(struct uart_port *port) 135 { 136 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 137 138 ar933x_uart_start_tx_interrupt(up); 139 } 140 141 static void ar933x_uart_stop_tx(struct uart_port *port) 142 { 143 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 144 145 ar933x_uart_stop_tx_interrupt(up); 146 } 147 148 static void ar933x_uart_stop_rx(struct uart_port *port) 149 { 150 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 151 152 up->ier &= ~AR933X_UART_INT_RX_VALID; 153 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); 154 } 155 156 static void ar933x_uart_break_ctl(struct uart_port *port, int break_state) 157 { 158 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 159 unsigned long flags; 160 161 spin_lock_irqsave(&up->port.lock, flags); 162 if (break_state == -1) 163 ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, 164 AR933X_UART_CS_TX_BREAK); 165 else 166 ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, 167 AR933X_UART_CS_TX_BREAK); 168 spin_unlock_irqrestore(&up->port.lock, flags); 169 } 170 171 static void ar933x_uart_enable_ms(struct uart_port *port) 172 { 173 } 174 175 /* 176 * baudrate = (clk / (scale + 1)) * (step * (1 / 2^17)) 177 */ 178 static unsigned long ar933x_uart_get_baud(unsigned int clk, 179 unsigned int scale, 180 unsigned int step) 181 { 182 u64 t; 183 u32 div; 184 185 div = (2 << 16) * (scale + 1); 186 t = clk; 187 t *= step; 188 t += (div / 2); 189 do_div(t, div); 190 191 return t; 192 } 193 194 static void ar933x_uart_get_scale_step(unsigned int clk, 195 unsigned int baud, 196 unsigned int *scale, 197 unsigned int *step) 198 { 199 unsigned int tscale; 200 long min_diff; 201 202 *scale = 0; 203 *step = 0; 204 205 min_diff = baud; 206 for (tscale = 0; tscale < AR933X_UART_MAX_SCALE; tscale++) { 207 u64 tstep; 208 int diff; 209 210 tstep = baud * (tscale + 1); 211 tstep *= (2 << 16); 212 do_div(tstep, clk); 213 214 if (tstep > AR933X_UART_MAX_STEP) 215 break; 216 217 diff = abs(ar933x_uart_get_baud(clk, tscale, tstep) - baud); 218 if (diff < min_diff) { 219 min_diff = diff; 220 *scale = tscale; 221 *step = tstep; 222 } 223 } 224 } 225 226 static void ar933x_uart_set_termios(struct uart_port *port, 227 struct ktermios *new, 228 struct ktermios *old) 229 { 230 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 231 unsigned int cs; 232 unsigned long flags; 233 unsigned int baud, scale, step; 234 235 /* Only CS8 is supported */ 236 new->c_cflag &= ~CSIZE; 237 new->c_cflag |= CS8; 238 239 /* Only one stop bit is supported */ 240 new->c_cflag &= ~CSTOPB; 241 242 cs = 0; 243 if (new->c_cflag & PARENB) { 244 if (!(new->c_cflag & PARODD)) 245 cs |= AR933X_UART_CS_PARITY_EVEN; 246 else 247 cs |= AR933X_UART_CS_PARITY_ODD; 248 } else { 249 cs |= AR933X_UART_CS_PARITY_NONE; 250 } 251 252 /* Mark/space parity is not supported */ 253 new->c_cflag &= ~CMSPAR; 254 255 baud = uart_get_baud_rate(port, new, old, up->min_baud, up->max_baud); 256 ar933x_uart_get_scale_step(port->uartclk, baud, &scale, &step); 257 258 /* 259 * Ok, we're now changing the port state. Do it with 260 * interrupts disabled. 261 */ 262 spin_lock_irqsave(&up->port.lock, flags); 263 264 /* disable the UART */ 265 ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, 266 AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S); 267 268 /* Update the per-port timeout. */ 269 uart_update_timeout(port, new->c_cflag, baud); 270 271 up->port.ignore_status_mask = 0; 272 273 /* ignore all characters if CREAD is not set */ 274 if ((new->c_cflag & CREAD) == 0) 275 up->port.ignore_status_mask |= AR933X_DUMMY_STATUS_RD; 276 277 ar933x_uart_write(up, AR933X_UART_CLOCK_REG, 278 scale << AR933X_UART_CLOCK_SCALE_S | step); 279 280 /* setup configuration register */ 281 ar933x_uart_rmw(up, AR933X_UART_CS_REG, AR933X_UART_CS_PARITY_M, cs); 282 283 /* enable host interrupt */ 284 ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, 285 AR933X_UART_CS_HOST_INT_EN); 286 287 /* reenable the UART */ 288 ar933x_uart_rmw(up, AR933X_UART_CS_REG, 289 AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S, 290 AR933X_UART_CS_IF_MODE_DCE << AR933X_UART_CS_IF_MODE_S); 291 292 spin_unlock_irqrestore(&up->port.lock, flags); 293 294 if (tty_termios_baud_rate(new)) 295 tty_termios_encode_baud_rate(new, baud, baud); 296 } 297 298 static void ar933x_uart_rx_chars(struct ar933x_uart_port *up) 299 { 300 struct tty_struct *tty; 301 int max_count = 256; 302 303 tty = tty_port_tty_get(&up->port.state->port); 304 do { 305 unsigned int rdata; 306 unsigned char ch; 307 308 rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); 309 if ((rdata & AR933X_UART_DATA_RX_CSR) == 0) 310 break; 311 312 /* remove the character from the FIFO */ 313 ar933x_uart_write(up, AR933X_UART_DATA_REG, 314 AR933X_UART_DATA_RX_CSR); 315 316 if (!tty) { 317 /* discard the data if no tty available */ 318 continue; 319 } 320 321 up->port.icount.rx++; 322 ch = rdata & AR933X_UART_DATA_TX_RX_MASK; 323 324 if (uart_handle_sysrq_char(&up->port, ch)) 325 continue; 326 327 if ((up->port.ignore_status_mask & AR933X_DUMMY_STATUS_RD) == 0) 328 tty_insert_flip_char(tty, ch, TTY_NORMAL); 329 } while (max_count-- > 0); 330 331 if (tty) { 332 tty_flip_buffer_push(tty); 333 tty_kref_put(tty); 334 } 335 } 336 337 static void ar933x_uart_tx_chars(struct ar933x_uart_port *up) 338 { 339 struct circ_buf *xmit = &up->port.state->xmit; 340 int count; 341 342 if (uart_tx_stopped(&up->port)) 343 return; 344 345 count = up->port.fifosize; 346 do { 347 unsigned int rdata; 348 349 rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); 350 if ((rdata & AR933X_UART_DATA_TX_CSR) == 0) 351 break; 352 353 if (up->port.x_char) { 354 ar933x_uart_putc(up, up->port.x_char); 355 up->port.icount.tx++; 356 up->port.x_char = 0; 357 continue; 358 } 359 360 if (uart_circ_empty(xmit)) 361 break; 362 363 ar933x_uart_putc(up, xmit->buf[xmit->tail]); 364 365 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 366 up->port.icount.tx++; 367 } while (--count > 0); 368 369 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 370 uart_write_wakeup(&up->port); 371 372 if (!uart_circ_empty(xmit)) 373 ar933x_uart_start_tx_interrupt(up); 374 } 375 376 static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id) 377 { 378 struct ar933x_uart_port *up = dev_id; 379 unsigned int status; 380 381 status = ar933x_uart_read(up, AR933X_UART_CS_REG); 382 if ((status & AR933X_UART_CS_HOST_INT) == 0) 383 return IRQ_NONE; 384 385 spin_lock(&up->port.lock); 386 387 status = ar933x_uart_read(up, AR933X_UART_INT_REG); 388 status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG); 389 390 if (status & AR933X_UART_INT_RX_VALID) { 391 ar933x_uart_write(up, AR933X_UART_INT_REG, 392 AR933X_UART_INT_RX_VALID); 393 ar933x_uart_rx_chars(up); 394 } 395 396 if (status & AR933X_UART_INT_TX_EMPTY) { 397 ar933x_uart_write(up, AR933X_UART_INT_REG, 398 AR933X_UART_INT_TX_EMPTY); 399 ar933x_uart_stop_tx_interrupt(up); 400 ar933x_uart_tx_chars(up); 401 } 402 403 spin_unlock(&up->port.lock); 404 405 return IRQ_HANDLED; 406 } 407 408 static int ar933x_uart_startup(struct uart_port *port) 409 { 410 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 411 unsigned long flags; 412 int ret; 413 414 ret = request_irq(up->port.irq, ar933x_uart_interrupt, 415 up->port.irqflags, dev_name(up->port.dev), up); 416 if (ret) 417 return ret; 418 419 spin_lock_irqsave(&up->port.lock, flags); 420 421 /* Enable HOST interrupts */ 422 ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, 423 AR933X_UART_CS_HOST_INT_EN); 424 425 /* Enable RX interrupts */ 426 up->ier = AR933X_UART_INT_RX_VALID; 427 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); 428 429 spin_unlock_irqrestore(&up->port.lock, flags); 430 431 return 0; 432 } 433 434 static void ar933x_uart_shutdown(struct uart_port *port) 435 { 436 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 437 438 /* Disable all interrupts */ 439 up->ier = 0; 440 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); 441 442 /* Disable break condition */ 443 ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, 444 AR933X_UART_CS_TX_BREAK); 445 446 free_irq(up->port.irq, up); 447 } 448 449 static const char *ar933x_uart_type(struct uart_port *port) 450 { 451 return (port->type == PORT_AR933X) ? "AR933X UART" : NULL; 452 } 453 454 static void ar933x_uart_release_port(struct uart_port *port) 455 { 456 /* Nothing to release ... */ 457 } 458 459 static int ar933x_uart_request_port(struct uart_port *port) 460 { 461 /* UARTs always present */ 462 return 0; 463 } 464 465 static void ar933x_uart_config_port(struct uart_port *port, int flags) 466 { 467 if (flags & UART_CONFIG_TYPE) 468 port->type = PORT_AR933X; 469 } 470 471 static int ar933x_uart_verify_port(struct uart_port *port, 472 struct serial_struct *ser) 473 { 474 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 475 476 if (ser->type != PORT_UNKNOWN && 477 ser->type != PORT_AR933X) 478 return -EINVAL; 479 480 if (ser->irq < 0 || ser->irq >= NR_IRQS) 481 return -EINVAL; 482 483 if (ser->baud_base < up->min_baud || 484 ser->baud_base > up->max_baud) 485 return -EINVAL; 486 487 return 0; 488 } 489 490 static struct uart_ops ar933x_uart_ops = { 491 .tx_empty = ar933x_uart_tx_empty, 492 .set_mctrl = ar933x_uart_set_mctrl, 493 .get_mctrl = ar933x_uart_get_mctrl, 494 .stop_tx = ar933x_uart_stop_tx, 495 .start_tx = ar933x_uart_start_tx, 496 .stop_rx = ar933x_uart_stop_rx, 497 .enable_ms = ar933x_uart_enable_ms, 498 .break_ctl = ar933x_uart_break_ctl, 499 .startup = ar933x_uart_startup, 500 .shutdown = ar933x_uart_shutdown, 501 .set_termios = ar933x_uart_set_termios, 502 .type = ar933x_uart_type, 503 .release_port = ar933x_uart_release_port, 504 .request_port = ar933x_uart_request_port, 505 .config_port = ar933x_uart_config_port, 506 .verify_port = ar933x_uart_verify_port, 507 }; 508 509 #ifdef CONFIG_SERIAL_AR933X_CONSOLE 510 511 static struct ar933x_uart_port * 512 ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS]; 513 514 static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up) 515 { 516 unsigned int status; 517 unsigned int timeout = 60000; 518 519 /* Wait up to 60ms for the character(s) to be sent. */ 520 do { 521 status = ar933x_uart_read(up, AR933X_UART_DATA_REG); 522 if (--timeout == 0) 523 break; 524 udelay(1); 525 } while ((status & AR933X_UART_DATA_TX_CSR) == 0); 526 } 527 528 static void ar933x_uart_console_putchar(struct uart_port *port, int ch) 529 { 530 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 531 532 ar933x_uart_wait_xmitr(up); 533 ar933x_uart_putc(up, ch); 534 } 535 536 static void ar933x_uart_console_write(struct console *co, const char *s, 537 unsigned int count) 538 { 539 struct ar933x_uart_port *up = ar933x_console_ports[co->index]; 540 unsigned long flags; 541 unsigned int int_en; 542 int locked = 1; 543 544 local_irq_save(flags); 545 546 if (up->port.sysrq) 547 locked = 0; 548 else if (oops_in_progress) 549 locked = spin_trylock(&up->port.lock); 550 else 551 spin_lock(&up->port.lock); 552 553 /* 554 * First save the IER then disable the interrupts 555 */ 556 int_en = ar933x_uart_read(up, AR933X_UART_INT_EN_REG); 557 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0); 558 559 uart_console_write(&up->port, s, count, ar933x_uart_console_putchar); 560 561 /* 562 * Finally, wait for transmitter to become empty 563 * and restore the IER 564 */ 565 ar933x_uart_wait_xmitr(up); 566 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, int_en); 567 568 ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS); 569 570 if (locked) 571 spin_unlock(&up->port.lock); 572 573 local_irq_restore(flags); 574 } 575 576 static int ar933x_uart_console_setup(struct console *co, char *options) 577 { 578 struct ar933x_uart_port *up; 579 int baud = 115200; 580 int bits = 8; 581 int parity = 'n'; 582 int flow = 'n'; 583 584 if (co->index < 0 || co->index >= CONFIG_SERIAL_AR933X_NR_UARTS) 585 return -EINVAL; 586 587 up = ar933x_console_ports[co->index]; 588 if (!up) 589 return -ENODEV; 590 591 if (options) 592 uart_parse_options(options, &baud, &parity, &bits, &flow); 593 594 return uart_set_options(&up->port, co, baud, parity, bits, flow); 595 } 596 597 static struct console ar933x_uart_console = { 598 .name = "ttyATH", 599 .write = ar933x_uart_console_write, 600 .device = uart_console_device, 601 .setup = ar933x_uart_console_setup, 602 .flags = CON_PRINTBUFFER, 603 .index = -1, 604 .data = &ar933x_uart_driver, 605 }; 606 607 static void ar933x_uart_add_console_port(struct ar933x_uart_port *up) 608 { 609 ar933x_console_ports[up->port.line] = up; 610 } 611 612 #define AR933X_SERIAL_CONSOLE (&ar933x_uart_console) 613 614 #else 615 616 static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {} 617 618 #define AR933X_SERIAL_CONSOLE NULL 619 620 #endif /* CONFIG_SERIAL_AR933X_CONSOLE */ 621 622 static struct uart_driver ar933x_uart_driver = { 623 .owner = THIS_MODULE, 624 .driver_name = DRIVER_NAME, 625 .dev_name = "ttyATH", 626 .nr = CONFIG_SERIAL_AR933X_NR_UARTS, 627 .cons = AR933X_SERIAL_CONSOLE, 628 }; 629 630 static int ar933x_uart_probe(struct platform_device *pdev) 631 { 632 struct ar933x_uart_platform_data *pdata; 633 struct ar933x_uart_port *up; 634 struct uart_port *port; 635 struct resource *mem_res; 636 struct resource *irq_res; 637 unsigned int baud; 638 int id; 639 int ret; 640 641 pdata = pdev->dev.platform_data; 642 if (!pdata) 643 return -EINVAL; 644 645 id = pdev->id; 646 if (id == -1) 647 id = 0; 648 649 if (id > CONFIG_SERIAL_AR933X_NR_UARTS) 650 return -EINVAL; 651 652 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 653 if (!mem_res) { 654 dev_err(&pdev->dev, "no MEM resource\n"); 655 return -EINVAL; 656 } 657 658 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 659 if (!irq_res) { 660 dev_err(&pdev->dev, "no IRQ resource\n"); 661 return -EINVAL; 662 } 663 664 up = kzalloc(sizeof(struct ar933x_uart_port), GFP_KERNEL); 665 if (!up) 666 return -ENOMEM; 667 668 port = &up->port; 669 port->mapbase = mem_res->start; 670 671 port->membase = ioremap(mem_res->start, AR933X_UART_REGS_SIZE); 672 if (!port->membase) { 673 ret = -ENOMEM; 674 goto err_free_up; 675 } 676 677 port->line = id; 678 port->irq = irq_res->start; 679 port->dev = &pdev->dev; 680 port->type = PORT_AR933X; 681 port->iotype = UPIO_MEM32; 682 port->uartclk = pdata->uartclk; 683 684 port->regshift = 2; 685 port->fifosize = AR933X_UART_FIFO_SIZE; 686 port->ops = &ar933x_uart_ops; 687 688 baud = ar933x_uart_get_baud(port->uartclk, AR933X_UART_MAX_SCALE, 1); 689 up->min_baud = max_t(unsigned int, baud, AR933X_UART_MIN_BAUD); 690 691 baud = ar933x_uart_get_baud(port->uartclk, 0, AR933X_UART_MAX_STEP); 692 up->max_baud = min_t(unsigned int, baud, AR933X_UART_MAX_BAUD); 693 694 ar933x_uart_add_console_port(up); 695 696 ret = uart_add_one_port(&ar933x_uart_driver, &up->port); 697 if (ret) 698 goto err_unmap; 699 700 platform_set_drvdata(pdev, up); 701 return 0; 702 703 err_unmap: 704 iounmap(up->port.membase); 705 err_free_up: 706 kfree(up); 707 return ret; 708 } 709 710 static int ar933x_uart_remove(struct platform_device *pdev) 711 { 712 struct ar933x_uart_port *up; 713 714 up = platform_get_drvdata(pdev); 715 platform_set_drvdata(pdev, NULL); 716 717 if (up) { 718 uart_remove_one_port(&ar933x_uart_driver, &up->port); 719 iounmap(up->port.membase); 720 kfree(up); 721 } 722 723 return 0; 724 } 725 726 static struct platform_driver ar933x_uart_platform_driver = { 727 .probe = ar933x_uart_probe, 728 .remove = ar933x_uart_remove, 729 .driver = { 730 .name = DRIVER_NAME, 731 .owner = THIS_MODULE, 732 }, 733 }; 734 735 static int __init ar933x_uart_init(void) 736 { 737 int ret; 738 739 ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS; 740 ret = uart_register_driver(&ar933x_uart_driver); 741 if (ret) 742 goto err_out; 743 744 ret = platform_driver_register(&ar933x_uart_platform_driver); 745 if (ret) 746 goto err_unregister_uart_driver; 747 748 return 0; 749 750 err_unregister_uart_driver: 751 uart_unregister_driver(&ar933x_uart_driver); 752 err_out: 753 return ret; 754 } 755 756 static void __exit ar933x_uart_exit(void) 757 { 758 platform_driver_unregister(&ar933x_uart_platform_driver); 759 uart_unregister_driver(&ar933x_uart_driver); 760 } 761 762 module_init(ar933x_uart_init); 763 module_exit(ar933x_uart_exit); 764 765 MODULE_DESCRIPTION("Atheros AR933X UART driver"); 766 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); 767 MODULE_LICENSE("GPL v2"); 768 MODULE_ALIAS("platform:" DRIVER_NAME); 769