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_port *port = &up->port.state->port; 301 int max_count = 256; 302 303 do { 304 unsigned int rdata; 305 unsigned char ch; 306 307 rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); 308 if ((rdata & AR933X_UART_DATA_RX_CSR) == 0) 309 break; 310 311 /* remove the character from the FIFO */ 312 ar933x_uart_write(up, AR933X_UART_DATA_REG, 313 AR933X_UART_DATA_RX_CSR); 314 315 up->port.icount.rx++; 316 ch = rdata & AR933X_UART_DATA_TX_RX_MASK; 317 318 if (uart_handle_sysrq_char(&up->port, ch)) 319 continue; 320 321 if ((up->port.ignore_status_mask & AR933X_DUMMY_STATUS_RD) == 0) 322 tty_insert_flip_char(port, ch, TTY_NORMAL); 323 } while (max_count-- > 0); 324 325 tty_flip_buffer_push(port); 326 } 327 328 static void ar933x_uart_tx_chars(struct ar933x_uart_port *up) 329 { 330 struct circ_buf *xmit = &up->port.state->xmit; 331 int count; 332 333 if (uart_tx_stopped(&up->port)) 334 return; 335 336 count = up->port.fifosize; 337 do { 338 unsigned int rdata; 339 340 rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); 341 if ((rdata & AR933X_UART_DATA_TX_CSR) == 0) 342 break; 343 344 if (up->port.x_char) { 345 ar933x_uart_putc(up, up->port.x_char); 346 up->port.icount.tx++; 347 up->port.x_char = 0; 348 continue; 349 } 350 351 if (uart_circ_empty(xmit)) 352 break; 353 354 ar933x_uart_putc(up, xmit->buf[xmit->tail]); 355 356 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 357 up->port.icount.tx++; 358 } while (--count > 0); 359 360 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 361 uart_write_wakeup(&up->port); 362 363 if (!uart_circ_empty(xmit)) 364 ar933x_uart_start_tx_interrupt(up); 365 } 366 367 static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id) 368 { 369 struct ar933x_uart_port *up = dev_id; 370 unsigned int status; 371 372 status = ar933x_uart_read(up, AR933X_UART_CS_REG); 373 if ((status & AR933X_UART_CS_HOST_INT) == 0) 374 return IRQ_NONE; 375 376 spin_lock(&up->port.lock); 377 378 status = ar933x_uart_read(up, AR933X_UART_INT_REG); 379 status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG); 380 381 if (status & AR933X_UART_INT_RX_VALID) { 382 ar933x_uart_write(up, AR933X_UART_INT_REG, 383 AR933X_UART_INT_RX_VALID); 384 ar933x_uart_rx_chars(up); 385 } 386 387 if (status & AR933X_UART_INT_TX_EMPTY) { 388 ar933x_uart_write(up, AR933X_UART_INT_REG, 389 AR933X_UART_INT_TX_EMPTY); 390 ar933x_uart_stop_tx_interrupt(up); 391 ar933x_uart_tx_chars(up); 392 } 393 394 spin_unlock(&up->port.lock); 395 396 return IRQ_HANDLED; 397 } 398 399 static int ar933x_uart_startup(struct uart_port *port) 400 { 401 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 402 unsigned long flags; 403 int ret; 404 405 ret = request_irq(up->port.irq, ar933x_uart_interrupt, 406 up->port.irqflags, dev_name(up->port.dev), up); 407 if (ret) 408 return ret; 409 410 spin_lock_irqsave(&up->port.lock, flags); 411 412 /* Enable HOST interrupts */ 413 ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, 414 AR933X_UART_CS_HOST_INT_EN); 415 416 /* Enable RX interrupts */ 417 up->ier = AR933X_UART_INT_RX_VALID; 418 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); 419 420 spin_unlock_irqrestore(&up->port.lock, flags); 421 422 return 0; 423 } 424 425 static void ar933x_uart_shutdown(struct uart_port *port) 426 { 427 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 428 429 /* Disable all interrupts */ 430 up->ier = 0; 431 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); 432 433 /* Disable break condition */ 434 ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, 435 AR933X_UART_CS_TX_BREAK); 436 437 free_irq(up->port.irq, up); 438 } 439 440 static const char *ar933x_uart_type(struct uart_port *port) 441 { 442 return (port->type == PORT_AR933X) ? "AR933X UART" : NULL; 443 } 444 445 static void ar933x_uart_release_port(struct uart_port *port) 446 { 447 /* Nothing to release ... */ 448 } 449 450 static int ar933x_uart_request_port(struct uart_port *port) 451 { 452 /* UARTs always present */ 453 return 0; 454 } 455 456 static void ar933x_uart_config_port(struct uart_port *port, int flags) 457 { 458 if (flags & UART_CONFIG_TYPE) 459 port->type = PORT_AR933X; 460 } 461 462 static int ar933x_uart_verify_port(struct uart_port *port, 463 struct serial_struct *ser) 464 { 465 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 466 467 if (ser->type != PORT_UNKNOWN && 468 ser->type != PORT_AR933X) 469 return -EINVAL; 470 471 if (ser->irq < 0 || ser->irq >= NR_IRQS) 472 return -EINVAL; 473 474 if (ser->baud_base < up->min_baud || 475 ser->baud_base > up->max_baud) 476 return -EINVAL; 477 478 return 0; 479 } 480 481 static struct uart_ops ar933x_uart_ops = { 482 .tx_empty = ar933x_uart_tx_empty, 483 .set_mctrl = ar933x_uart_set_mctrl, 484 .get_mctrl = ar933x_uart_get_mctrl, 485 .stop_tx = ar933x_uart_stop_tx, 486 .start_tx = ar933x_uart_start_tx, 487 .stop_rx = ar933x_uart_stop_rx, 488 .enable_ms = ar933x_uart_enable_ms, 489 .break_ctl = ar933x_uart_break_ctl, 490 .startup = ar933x_uart_startup, 491 .shutdown = ar933x_uart_shutdown, 492 .set_termios = ar933x_uart_set_termios, 493 .type = ar933x_uart_type, 494 .release_port = ar933x_uart_release_port, 495 .request_port = ar933x_uart_request_port, 496 .config_port = ar933x_uart_config_port, 497 .verify_port = ar933x_uart_verify_port, 498 }; 499 500 #ifdef CONFIG_SERIAL_AR933X_CONSOLE 501 502 static struct ar933x_uart_port * 503 ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS]; 504 505 static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up) 506 { 507 unsigned int status; 508 unsigned int timeout = 60000; 509 510 /* Wait up to 60ms for the character(s) to be sent. */ 511 do { 512 status = ar933x_uart_read(up, AR933X_UART_DATA_REG); 513 if (--timeout == 0) 514 break; 515 udelay(1); 516 } while ((status & AR933X_UART_DATA_TX_CSR) == 0); 517 } 518 519 static void ar933x_uart_console_putchar(struct uart_port *port, int ch) 520 { 521 struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; 522 523 ar933x_uart_wait_xmitr(up); 524 ar933x_uart_putc(up, ch); 525 } 526 527 static void ar933x_uart_console_write(struct console *co, const char *s, 528 unsigned int count) 529 { 530 struct ar933x_uart_port *up = ar933x_console_ports[co->index]; 531 unsigned long flags; 532 unsigned int int_en; 533 int locked = 1; 534 535 local_irq_save(flags); 536 537 if (up->port.sysrq) 538 locked = 0; 539 else if (oops_in_progress) 540 locked = spin_trylock(&up->port.lock); 541 else 542 spin_lock(&up->port.lock); 543 544 /* 545 * First save the IER then disable the interrupts 546 */ 547 int_en = ar933x_uart_read(up, AR933X_UART_INT_EN_REG); 548 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0); 549 550 uart_console_write(&up->port, s, count, ar933x_uart_console_putchar); 551 552 /* 553 * Finally, wait for transmitter to become empty 554 * and restore the IER 555 */ 556 ar933x_uart_wait_xmitr(up); 557 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, int_en); 558 559 ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS); 560 561 if (locked) 562 spin_unlock(&up->port.lock); 563 564 local_irq_restore(flags); 565 } 566 567 static int ar933x_uart_console_setup(struct console *co, char *options) 568 { 569 struct ar933x_uart_port *up; 570 int baud = 115200; 571 int bits = 8; 572 int parity = 'n'; 573 int flow = 'n'; 574 575 if (co->index < 0 || co->index >= CONFIG_SERIAL_AR933X_NR_UARTS) 576 return -EINVAL; 577 578 up = ar933x_console_ports[co->index]; 579 if (!up) 580 return -ENODEV; 581 582 if (options) 583 uart_parse_options(options, &baud, &parity, &bits, &flow); 584 585 return uart_set_options(&up->port, co, baud, parity, bits, flow); 586 } 587 588 static struct console ar933x_uart_console = { 589 .name = "ttyATH", 590 .write = ar933x_uart_console_write, 591 .device = uart_console_device, 592 .setup = ar933x_uart_console_setup, 593 .flags = CON_PRINTBUFFER, 594 .index = -1, 595 .data = &ar933x_uart_driver, 596 }; 597 598 static void ar933x_uart_add_console_port(struct ar933x_uart_port *up) 599 { 600 ar933x_console_ports[up->port.line] = up; 601 } 602 603 #define AR933X_SERIAL_CONSOLE (&ar933x_uart_console) 604 605 #else 606 607 static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {} 608 609 #define AR933X_SERIAL_CONSOLE NULL 610 611 #endif /* CONFIG_SERIAL_AR933X_CONSOLE */ 612 613 static struct uart_driver ar933x_uart_driver = { 614 .owner = THIS_MODULE, 615 .driver_name = DRIVER_NAME, 616 .dev_name = "ttyATH", 617 .nr = CONFIG_SERIAL_AR933X_NR_UARTS, 618 .cons = AR933X_SERIAL_CONSOLE, 619 }; 620 621 static int ar933x_uart_probe(struct platform_device *pdev) 622 { 623 struct ar933x_uart_platform_data *pdata; 624 struct ar933x_uart_port *up; 625 struct uart_port *port; 626 struct resource *mem_res; 627 struct resource *irq_res; 628 unsigned int baud; 629 int id; 630 int ret; 631 632 pdata = pdev->dev.platform_data; 633 if (!pdata) 634 return -EINVAL; 635 636 id = pdev->id; 637 if (id == -1) 638 id = 0; 639 640 if (id > CONFIG_SERIAL_AR933X_NR_UARTS) 641 return -EINVAL; 642 643 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 644 if (!mem_res) { 645 dev_err(&pdev->dev, "no MEM resource\n"); 646 return -EINVAL; 647 } 648 649 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 650 if (!irq_res) { 651 dev_err(&pdev->dev, "no IRQ resource\n"); 652 return -EINVAL; 653 } 654 655 up = kzalloc(sizeof(struct ar933x_uart_port), GFP_KERNEL); 656 if (!up) 657 return -ENOMEM; 658 659 port = &up->port; 660 port->mapbase = mem_res->start; 661 662 port->membase = ioremap(mem_res->start, AR933X_UART_REGS_SIZE); 663 if (!port->membase) { 664 ret = -ENOMEM; 665 goto err_free_up; 666 } 667 668 port->line = id; 669 port->irq = irq_res->start; 670 port->dev = &pdev->dev; 671 port->type = PORT_AR933X; 672 port->iotype = UPIO_MEM32; 673 port->uartclk = pdata->uartclk; 674 675 port->regshift = 2; 676 port->fifosize = AR933X_UART_FIFO_SIZE; 677 port->ops = &ar933x_uart_ops; 678 679 baud = ar933x_uart_get_baud(port->uartclk, AR933X_UART_MAX_SCALE, 1); 680 up->min_baud = max_t(unsigned int, baud, AR933X_UART_MIN_BAUD); 681 682 baud = ar933x_uart_get_baud(port->uartclk, 0, AR933X_UART_MAX_STEP); 683 up->max_baud = min_t(unsigned int, baud, AR933X_UART_MAX_BAUD); 684 685 ar933x_uart_add_console_port(up); 686 687 ret = uart_add_one_port(&ar933x_uart_driver, &up->port); 688 if (ret) 689 goto err_unmap; 690 691 platform_set_drvdata(pdev, up); 692 return 0; 693 694 err_unmap: 695 iounmap(up->port.membase); 696 err_free_up: 697 kfree(up); 698 return ret; 699 } 700 701 static int ar933x_uart_remove(struct platform_device *pdev) 702 { 703 struct ar933x_uart_port *up; 704 705 up = platform_get_drvdata(pdev); 706 platform_set_drvdata(pdev, NULL); 707 708 if (up) { 709 uart_remove_one_port(&ar933x_uart_driver, &up->port); 710 iounmap(up->port.membase); 711 kfree(up); 712 } 713 714 return 0; 715 } 716 717 static struct platform_driver ar933x_uart_platform_driver = { 718 .probe = ar933x_uart_probe, 719 .remove = ar933x_uart_remove, 720 .driver = { 721 .name = DRIVER_NAME, 722 .owner = THIS_MODULE, 723 }, 724 }; 725 726 static int __init ar933x_uart_init(void) 727 { 728 int ret; 729 730 ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS; 731 ret = uart_register_driver(&ar933x_uart_driver); 732 if (ret) 733 goto err_out; 734 735 ret = platform_driver_register(&ar933x_uart_platform_driver); 736 if (ret) 737 goto err_unregister_uart_driver; 738 739 return 0; 740 741 err_unregister_uart_driver: 742 uart_unregister_driver(&ar933x_uart_driver); 743 err_out: 744 return ret; 745 } 746 747 static void __exit ar933x_uart_exit(void) 748 { 749 platform_driver_unregister(&ar933x_uart_platform_driver); 750 uart_unregister_driver(&ar933x_uart_driver); 751 } 752 753 module_init(ar933x_uart_init); 754 module_exit(ar933x_uart_exit); 755 756 MODULE_DESCRIPTION("Atheros AR933X UART driver"); 757 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); 758 MODULE_LICENSE("GPL v2"); 759 MODULE_ALIAS("platform:" DRIVER_NAME); 760