| 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * ADM8668 serial driver, totally ripped the source from BCM63xx and changed |
| 7 | * all the registers to fit our hardware, and removed all the features that |
| 8 | * I didn't know because our GPL'd serial driver was way lame. |
| 9 | * |
| 10 | * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us> |
| 11 | * Derived directly from bcm63xx_uart |
| 12 | * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr> |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #if defined(CONFIG_SERIAL_ADM8668_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 17 | #define SUPPORT_SYSRQ |
| 18 | #endif |
| 19 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/console.h> |
| 26 | #include <linux/clk.h> |
| 27 | #include <linux/tty.h> |
| 28 | #include <linux/tty_flip.h> |
| 29 | #include <linux/sysrq.h> |
| 30 | #include <linux/serial.h> |
| 31 | #include <linux/serial_core.h> |
| 32 | #include <adm8668.h> |
| 33 | |
| 34 | #define ADM8668_NR_UARTS 1 |
| 35 | |
| 36 | static struct uart_port ports[ADM8668_NR_UARTS]; |
| 37 | |
| 38 | /* |
| 39 | * handy uart register accessor |
| 40 | */ |
| 41 | static inline unsigned int adm_uart_readl(struct uart_port *port, |
| 42 | unsigned int offset) |
| 43 | { |
| 44 | return (*(volatile unsigned int *)(port->membase + offset)); |
| 45 | } |
| 46 | |
| 47 | static inline void adm_uart_writel(struct uart_port *port, |
| 48 | unsigned int value, unsigned int offset) |
| 49 | { |
| 50 | (*((volatile unsigned int *)(port->membase + offset))) = value; |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * serial core request to check if uart tx fifo is empty |
| 55 | */ |
| 56 | static unsigned int adm_uart_tx_empty(struct uart_port *port) |
| 57 | { |
| 58 | /* we always wait for completion, no buffer is made... */ |
| 59 | return 1; |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * serial core request to set RTS and DTR pin state and loopback mode |
| 64 | */ |
| 65 | static void adm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 66 | { |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * serial core request to return RI, CTS, DCD and DSR pin state |
| 71 | */ |
| 72 | static unsigned int adm_uart_get_mctrl(struct uart_port *port) |
| 73 | { |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * serial core request to disable tx ASAP (used for flow control) |
| 79 | */ |
| 80 | static void adm_uart_stop_tx(struct uart_port *port) |
| 81 | { |
| 82 | unsigned int val; |
| 83 | |
| 84 | val = adm_uart_readl(port, UART_CR_REG); |
| 85 | val &= ~(UART_TX_INT_EN); |
| 86 | adm_uart_writel(port, val, UART_CR_REG); |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * serial core request to (re)enable tx |
| 91 | */ |
| 92 | static void adm_uart_start_tx(struct uart_port *port) |
| 93 | { |
| 94 | unsigned int val; |
| 95 | |
| 96 | val = adm_uart_readl(port, UART_CR_REG); |
| 97 | val |= UART_TX_INT_EN; |
| 98 | adm_uart_writel(port, val, UART_CR_REG); |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * serial core request to stop rx, called before port shutdown |
| 103 | */ |
| 104 | static void adm_uart_stop_rx(struct uart_port *port) |
| 105 | { |
| 106 | unsigned int val; |
| 107 | |
| 108 | val = adm_uart_readl(port, UART_CR_REG); |
| 109 | val &= ~UART_RX_INT_EN; |
| 110 | adm_uart_writel(port, val, UART_CR_REG); |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * serial core request to enable modem status interrupt reporting |
| 115 | */ |
| 116 | static void adm_uart_enable_ms(struct uart_port *port) |
| 117 | { |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * serial core request to start/stop emitting break char |
| 122 | */ |
| 123 | static void adm_uart_break_ctl(struct uart_port *port, int ctl) |
| 124 | { |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * return port type in string format |
| 129 | */ |
| 130 | static const char *adm_uart_type(struct uart_port *port) |
| 131 | { |
| 132 | return (port->type == PORT_ADM8668) ? "adm8668_uart" : NULL; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * read all chars in rx fifo and send them to core |
| 137 | */ |
| 138 | static void adm_uart_do_rx(struct uart_port *port) |
| 139 | { |
| 140 | struct tty_struct *tty; |
| 141 | unsigned int max_count; |
| 142 | |
| 143 | /* limit number of char read in interrupt, should not be |
| 144 | * higher than fifo size anyway since we're much faster than |
| 145 | * serial port */ |
| 146 | max_count = 32; |
| 147 | tty = port->state->port.tty; |
| 148 | do { |
| 149 | unsigned int iestat, c, cstat; |
| 150 | char flag; |
| 151 | |
| 152 | /* get overrun/fifo empty information from ier |
| 153 | * register */ |
| 154 | iestat = adm_uart_readl(port, UART_FR_REG); |
| 155 | if (iestat & UART_RX_FIFO_EMPTY) |
| 156 | break; |
| 157 | |
| 158 | /* recieve status */ |
| 159 | cstat = adm_uart_readl(port, UART_RSR_REG); |
| 160 | /* clear errors */ |
| 161 | adm_uart_writel(port, cstat, UART_RSR_REG); |
| 162 | |
| 163 | c = adm_uart_readl(port, UART_DR_REG); |
| 164 | port->icount.rx++; |
| 165 | flag = TTY_NORMAL; |
| 166 | |
| 167 | if (unlikely((cstat & UART_RX_STATUS_MASK))) { |
| 168 | /* do stats first */ |
| 169 | if (cstat & UART_BREAK_ERR) { |
| 170 | port->icount.brk++; |
| 171 | if (uart_handle_break(port)) |
| 172 | continue; |
| 173 | } |
| 174 | |
| 175 | if (cstat & UART_PARITY_ERR) |
| 176 | port->icount.parity++; |
| 177 | if (cstat & UART_FRAMING_ERR) |
| 178 | port->icount.frame++; |
| 179 | if (cstat & UART_OVERRUN_ERR) { |
| 180 | port->icount.overrun++; |
| 181 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
| 182 | } |
| 183 | |
| 184 | /* update flag wrt read_status_mask */ |
| 185 | cstat &= port->read_status_mask; |
| 186 | if (cstat & UART_BREAK_ERR) |
| 187 | flag = TTY_BREAK; |
| 188 | if (cstat & UART_FRAMING_ERR) |
| 189 | flag = TTY_FRAME; |
| 190 | if (cstat & UART_PARITY_ERR) |
| 191 | flag = TTY_PARITY; |
| 192 | } |
| 193 | |
| 194 | if (uart_handle_sysrq_char(port, c)) |
| 195 | continue; |
| 196 | |
| 197 | /* fixthis */ |
| 198 | if ((cstat & port->ignore_status_mask) == 0) |
| 199 | tty_insert_flip_char(tty, c, flag); |
| 200 | } while (max_count--); |
| 201 | |
| 202 | tty_flip_buffer_push(tty); |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * fill tx fifo with chars to send, stop when fifo is about to be full |
| 207 | * or when all chars have been sent. |
| 208 | */ |
| 209 | static void adm_uart_do_tx(struct uart_port *port) |
| 210 | { |
| 211 | struct circ_buf *xmit; |
| 212 | |
| 213 | if (port->x_char) { |
| 214 | adm_uart_writel(port, port->x_char, UART_DR_REG); |
| 215 | port->icount.tx++; |
| 216 | port->x_char = 0; |
| 217 | return; |
| 218 | } |
| 219 | |
| 220 | if (uart_tx_stopped(port)) |
| 221 | adm_uart_stop_tx(port); |
| 222 | |
| 223 | xmit = &port->state->xmit; |
| 224 | |
| 225 | if (uart_circ_empty(xmit)) |
| 226 | goto txq_empty; |
| 227 | do |
| 228 | { |
| 229 | while ((adm_uart_readl(port, UART_FR_REG) & UART_TX_FIFO_FULL) != 0) |
| 230 | ; |
| 231 | adm_uart_writel(port, xmit->buf[xmit->tail], UART_DR_REG); |
| 232 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 233 | port->icount.tx++; |
| 234 | if (uart_circ_empty(xmit)) |
| 235 | break; |
| 236 | } while (1); |
| 237 | |
| 238 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 239 | uart_write_wakeup(port); |
| 240 | |
| 241 | if (uart_circ_empty(xmit)) |
| 242 | goto txq_empty; |
| 243 | |
| 244 | return; |
| 245 | |
| 246 | txq_empty: |
| 247 | adm_uart_stop_tx(port); |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * process uart interrupt |
| 252 | */ |
| 253 | static irqreturn_t adm_uart_interrupt(int irq, void *dev_id) |
| 254 | { |
| 255 | struct uart_port *port; |
| 256 | unsigned int irqstat; |
| 257 | |
| 258 | port = dev_id; |
| 259 | spin_lock(&port->lock); |
| 260 | |
| 261 | irqstat = adm_uart_readl(port, UART_IIR_REG); |
| 262 | |
| 263 | if (irqstat & (UART_RX_INT|UART_RX_TIMEOUT_INT)) { |
| 264 | adm_uart_do_rx(port); |
| 265 | } |
| 266 | |
| 267 | if (irqstat & UART_TX_INT) { |
| 268 | adm_uart_do_tx(port); |
| 269 | } |
| 270 | spin_unlock(&port->lock); |
| 271 | return IRQ_HANDLED; |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * enable rx & tx operation on uart |
| 276 | */ |
| 277 | static void adm_uart_enable(struct uart_port *port) |
| 278 | { |
| 279 | unsigned int val; |
| 280 | |
| 281 | val = adm_uart_readl(port, UART_CR_REG); |
| 282 | // BREAK_INT too |
| 283 | val |= (UART_RX_INT_EN | UART_RX_TIMEOUT_INT_EN); |
| 284 | adm_uart_writel(port, val, UART_CR_REG); |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * disable rx & tx operation on uart |
| 289 | */ |
| 290 | static void adm_uart_disable(struct uart_port *port) |
| 291 | { |
| 292 | unsigned int val; |
| 293 | |
| 294 | val = adm_uart_readl(port, UART_CR_REG); |
| 295 | val &= ~(UART_TX_INT_EN | UART_RX_INT_EN | UART_RX_TIMEOUT_INT_EN); |
| 296 | adm_uart_writel(port, val, UART_CR_REG); |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * clear all unread data in rx fifo and unsent data in tx fifo |
| 301 | */ |
| 302 | static void adm_uart_flush(struct uart_port *port) |
| 303 | { |
| 304 | /* read any pending char to make sure all irq status are |
| 305 | * cleared */ |
| 306 | (void)adm_uart_readl(port, UART_DR_REG); |
| 307 | } |
| 308 | |
| 309 | /* |
| 310 | * serial core request to initialize uart and start rx operation |
| 311 | */ |
| 312 | static int adm_uart_startup(struct uart_port *port) |
| 313 | { |
| 314 | int ret; |
| 315 | |
| 316 | /* clear any pending external input interrupt */ |
| 317 | (void)adm_uart_readl(port, UART_IIR_REG); |
| 318 | |
| 319 | /* register irq and enable rx interrupts */ |
| 320 | ret = request_irq(port->irq, adm_uart_interrupt, 0, |
| 321 | adm_uart_type(port), port); |
| 322 | if (ret) |
| 323 | return ret; |
| 324 | |
| 325 | adm_uart_enable(port); |
| 326 | |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * serial core request to flush & disable uart |
| 332 | */ |
| 333 | static void adm_uart_shutdown(struct uart_port *port) |
| 334 | { |
| 335 | unsigned long flags; |
| 336 | |
| 337 | spin_lock_irqsave(&port->lock, flags); |
| 338 | // adm_uart_writel(port, 0, UART_CR_REG); |
| 339 | spin_unlock_irqrestore(&port->lock, flags); |
| 340 | |
| 341 | adm_uart_disable(port); |
| 342 | adm_uart_flush(port); |
| 343 | free_irq(port->irq, port); |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * serial core request to change current uart setting |
| 348 | */ |
| 349 | static void adm_uart_set_termios(struct uart_port *port, |
| 350 | struct ktermios *new, |
| 351 | struct ktermios *old) |
| 352 | { |
| 353 | port->ignore_status_mask = 0; |
| 354 | uart_update_timeout(port, new->c_cflag, 115200); |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * serial core request to claim uart iomem |
| 359 | */ |
| 360 | static int adm_uart_request_port(struct uart_port *port) |
| 361 | { |
| 362 | unsigned int size = 0xf; |
| 363 | if (!request_mem_region(port->mapbase, size, "adm8668")) { |
| 364 | dev_err(port->dev, "Memory region busy\n"); |
| 365 | return -EBUSY; |
| 366 | } |
| 367 | |
| 368 | port->membase = ioremap(port->mapbase, size); |
| 369 | if (!port->membase) { |
| 370 | dev_err(port->dev, "Unable to map registers\n"); |
| 371 | release_mem_region(port->mapbase, size); |
| 372 | return -EBUSY; |
| 373 | } |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * serial core request to release uart iomem |
| 379 | */ |
| 380 | static void adm_uart_release_port(struct uart_port *port) |
| 381 | { |
| 382 | release_mem_region(port->mapbase, 0xf); |
| 383 | iounmap(port->membase); |
| 384 | } |
| 385 | |
| 386 | /* |
| 387 | * serial core request to do any port required autoconfiguration |
| 388 | */ |
| 389 | static void adm_uart_config_port(struct uart_port *port, int flags) |
| 390 | { |
| 391 | if (flags & UART_CONFIG_TYPE) { |
| 392 | if (adm_uart_request_port(port)) |
| 393 | return; |
| 394 | port->type = PORT_ADM8668; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | /* |
| 399 | * serial core request to check that port information in serinfo are |
| 400 | * suitable |
| 401 | */ |
| 402 | static int adm_uart_verify_port(struct uart_port *port, |
| 403 | struct serial_struct *serinfo) |
| 404 | { |
| 405 | if (port->type != PORT_ADM8668) |
| 406 | return -EINVAL; |
| 407 | if (port->irq != serinfo->irq) |
| 408 | return -EINVAL; |
| 409 | if (port->iotype != serinfo->io_type) |
| 410 | return -EINVAL; |
| 411 | if (port->mapbase != (unsigned long)serinfo->iomem_base) |
| 412 | return -EINVAL; |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | /* serial core callbacks */ |
| 417 | static struct uart_ops adm_uart_ops = { |
| 418 | .tx_empty = adm_uart_tx_empty, |
| 419 | .get_mctrl = adm_uart_get_mctrl, |
| 420 | .set_mctrl = adm_uart_set_mctrl, |
| 421 | .start_tx = adm_uart_start_tx, |
| 422 | .stop_tx = adm_uart_stop_tx, |
| 423 | .stop_rx = adm_uart_stop_rx, |
| 424 | .enable_ms = adm_uart_enable_ms, |
| 425 | .break_ctl = adm_uart_break_ctl, |
| 426 | .startup = adm_uart_startup, |
| 427 | .shutdown = adm_uart_shutdown, |
| 428 | .set_termios = adm_uart_set_termios, |
| 429 | .type = adm_uart_type, |
| 430 | .release_port = adm_uart_release_port, |
| 431 | .request_port = adm_uart_request_port, |
| 432 | .config_port = adm_uart_config_port, |
| 433 | .verify_port = adm_uart_verify_port, |
| 434 | }; |
| 435 | |
| 436 | #ifdef CONFIG_SERIAL_ADM8668_CONSOLE |
| 437 | static inline void wait_for_xmitr(struct uart_port *port) |
| 438 | { |
| 439 | while ((adm_uart_readl(port, UART_FR_REG) & UART_TX_FIFO_FULL) != 0) |
| 440 | ; |
| 441 | } |
| 442 | |
| 443 | /* |
| 444 | * output given char |
| 445 | */ |
| 446 | static void adm_console_putchar(struct uart_port *port, int ch) |
| 447 | { |
| 448 | wait_for_xmitr(port); |
| 449 | adm_uart_writel(port, ch, UART_DR_REG); |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | * console core request to output given string |
| 454 | */ |
| 455 | static void adm_console_write(struct console *co, const char *s, |
| 456 | unsigned int count) |
| 457 | { |
| 458 | struct uart_port *port; |
| 459 | unsigned long flags; |
| 460 | int locked; |
| 461 | |
| 462 | port = &ports[co->index]; |
| 463 | |
| 464 | local_irq_save(flags); |
| 465 | if (port->sysrq) { |
| 466 | /* adm_uart_interrupt() already took the lock */ |
| 467 | locked = 0; |
| 468 | } else if (oops_in_progress) { |
| 469 | locked = spin_trylock(&port->lock); |
| 470 | } else { |
| 471 | spin_lock(&port->lock); |
| 472 | locked = 1; |
| 473 | } |
| 474 | |
| 475 | /* call helper to deal with \r\n */ |
| 476 | uart_console_write(port, s, count, adm_console_putchar); |
| 477 | |
| 478 | /* and wait for char to be transmitted */ |
| 479 | wait_for_xmitr(port); |
| 480 | |
| 481 | if (locked) |
| 482 | spin_unlock(&port->lock); |
| 483 | local_irq_restore(flags); |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * console core request to setup given console, find matching uart |
| 488 | * port and setup it. |
| 489 | */ |
| 490 | static int adm_console_setup(struct console *co, char *options) |
| 491 | { |
| 492 | struct uart_port *port; |
| 493 | int baud = 115200; |
| 494 | int bits = 8; |
| 495 | int parity = 'n'; |
| 496 | int flow = 'n'; |
| 497 | |
| 498 | if (co->index < 0 || co->index >= ADM8668_NR_UARTS) |
| 499 | return -EINVAL; |
| 500 | port = &ports[co->index]; |
| 501 | if (!port->membase) |
| 502 | return -ENODEV; |
| 503 | |
| 504 | if (options) |
| 505 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 506 | |
| 507 | return uart_set_options(port, co, baud, parity, bits, flow); |
| 508 | } |
| 509 | |
| 510 | static struct uart_driver adm_uart_driver; |
| 511 | |
| 512 | static struct console adm8668_console = { |
| 513 | .name = "ttyS", |
| 514 | .write = adm_console_write, |
| 515 | .device = uart_console_device, |
| 516 | .setup = adm_console_setup, |
| 517 | .flags = CON_PRINTBUFFER, |
| 518 | .index = -1, |
| 519 | .data = &adm_uart_driver, |
| 520 | }; |
| 521 | |
| 522 | static int __init adm8668_console_init(void) |
| 523 | { |
| 524 | register_console(&adm8668_console); |
| 525 | return 0; |
| 526 | } |
| 527 | |
| 528 | console_initcall(adm8668_console_init); |
| 529 | |
| 530 | #define ADM8668_CONSOLE (&adm8668_console) |
| 531 | #else |
| 532 | #define ADM8668_CONSOLE NULL |
| 533 | #endif /* CONFIG_SERIAL_ADM8668_CONSOLE */ |
| 534 | |
| 535 | static struct uart_driver adm_uart_driver = { |
| 536 | .owner = THIS_MODULE, |
| 537 | .driver_name = "adm8668_uart", |
| 538 | .dev_name = "ttyS", |
| 539 | .major = TTY_MAJOR, |
| 540 | .minor = 64, |
| 541 | .nr = 1, |
| 542 | .cons = ADM8668_CONSOLE, |
| 543 | }; |
| 544 | |
| 545 | /* |
| 546 | * platform driver probe/remove callback |
| 547 | */ |
| 548 | static int __devinit adm_uart_probe(struct platform_device *pdev) |
| 549 | { |
| 550 | struct resource *res_mem, *res_irq; |
| 551 | struct uart_port *port; |
| 552 | int ret; |
| 553 | |
| 554 | if (pdev->id < 0 || pdev->id >= ADM8668_NR_UARTS) |
| 555 | return -EINVAL; |
| 556 | |
| 557 | if (ports[pdev->id].membase) |
| 558 | return -EBUSY; |
| 559 | |
| 560 | res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 561 | if (!res_mem) |
| 562 | return -ENODEV; |
| 563 | |
| 564 | res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| 565 | if (!res_irq) |
| 566 | return -ENODEV; |
| 567 | |
| 568 | port = &ports[pdev->id]; |
| 569 | memset(port, 0, sizeof(*port)); |
| 570 | port->iotype = UPIO_MEM; |
| 571 | port->mapbase = res_mem->start; |
| 572 | port->irq = res_irq->start; |
| 573 | port->ops = &adm_uart_ops; |
| 574 | port->flags = UPF_BOOT_AUTOCONF; |
| 575 | port->dev = &pdev->dev; |
| 576 | port->fifosize = 8; |
| 577 | port->uartclk = ADM8668_UARTCLK_FREQ; |
| 578 | |
| 579 | ret = uart_add_one_port(&adm_uart_driver, port); |
| 580 | if (ret) { |
| 581 | ports[pdev->id].membase = 0; |
| 582 | return ret; |
| 583 | } |
| 584 | platform_set_drvdata(pdev, port); |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | static int __devexit adm_uart_remove(struct platform_device *pdev) |
| 589 | { |
| 590 | struct uart_port *port; |
| 591 | |
| 592 | port = platform_get_drvdata(pdev); |
| 593 | uart_remove_one_port(&adm_uart_driver, port); |
| 594 | platform_set_drvdata(pdev, NULL); |
| 595 | /* mark port as free */ |
| 596 | ports[pdev->id].membase = 0; |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | /* |
| 601 | * platform driver stuff |
| 602 | */ |
| 603 | static struct platform_driver adm_uart_platform_driver = { |
| 604 | .probe = adm_uart_probe, |
| 605 | .remove = __devexit_p(adm_uart_remove), |
| 606 | .driver = { |
| 607 | .owner = THIS_MODULE, |
| 608 | .name = "adm8668_uart", |
| 609 | }, |
| 610 | }; |
| 611 | |
| 612 | static int __init adm_uart_init(void) |
| 613 | { |
| 614 | int ret; |
| 615 | |
| 616 | ret = uart_register_driver(&adm_uart_driver); |
| 617 | if (ret) |
| 618 | return ret; |
| 619 | |
| 620 | ret = platform_driver_register(&adm_uart_platform_driver); |
| 621 | if (ret) |
| 622 | uart_unregister_driver(&adm_uart_driver); |
| 623 | |
| 624 | return ret; |
| 625 | } |
| 626 | |
| 627 | static void __exit adm_uart_exit(void) |
| 628 | { |
| 629 | platform_driver_unregister(&adm_uart_platform_driver); |
| 630 | uart_unregister_driver(&adm_uart_driver); |
| 631 | } |
| 632 | |
| 633 | module_init(adm_uart_init); |
| 634 | module_exit(adm_uart_exit); |
| 635 | |
| 636 | MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>"); |
| 637 | MODULE_DESCRIPTION("ADM8668 integrated uart driver"); |
| 638 | MODULE_LICENSE("GPL"); |
| 639 | |
