| 1 | /* |
| 2 | * drivers/serial/ubi32_uarttio.c |
| 3 | * Ubicom32 Serial Virtual Peripherial Driver |
| 4 | * |
| 5 | * (C) Copyright 2009, Ubicom, Inc. |
| 6 | * |
| 7 | * This file is part of the Ubicom32 Linux Kernel Port. |
| 8 | * |
| 9 | * The Ubicom32 Linux Kernel Port is free software: you can redistribute |
| 10 | * it and/or modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation, either version 2 of the |
| 12 | * License, or (at your option) any later version. |
| 13 | * |
| 14 | * The Ubicom32 Linux Kernel Port is distributed in the hope that it |
| 15 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 16 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 17 | * the GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with the Ubicom32 Linux Kernel Port. If not, |
| 21 | * see <http://www.gnu.org/licenses/>. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/ioport.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/console.h> |
| 28 | #include <linux/sysrq.h> |
| 29 | #include <linux/platform_device.h> |
| 30 | #include <linux/tty.h> |
| 31 | #include <linux/tty_flip.h> |
| 32 | #include <linux/serial_core.h> |
| 33 | |
| 34 | #include <asm/ip5000.h> |
| 35 | #include <asm/gpio.h> |
| 36 | #include <asm/thread.h> |
| 37 | #include <asm/uart_tio.h> |
| 38 | |
| 39 | #define DRIVER_NAME "ubi32_uarttio" |
| 40 | |
| 41 | /* |
| 42 | * For storing the module parameters. |
| 43 | */ |
| 44 | #define UBI32_UARTTIO_MAX_PARAM_LEN 80 |
| 45 | static char utio_ports_param[UBI32_UARTTIO_MAX_PARAM_LEN]; |
| 46 | |
| 47 | /* |
| 48 | * UART name and device definitions |
| 49 | */ |
| 50 | #define UBI32_UARTTIO_NAME "ttyUV" // XXX |
| 51 | #define UBI32_UARTTIO_MAJOR 206 // XXX |
| 52 | #define UBI32_UARTTIO_MINOR 64 // XXX |
| 53 | |
| 54 | /* |
| 55 | * The following structures are allocated statically because the |
| 56 | * memory allocation subsystem is not initialized this early on |
| 57 | */ |
| 58 | |
| 59 | /* |
| 60 | * Per port structure |
| 61 | */ |
| 62 | struct ubi32_uarttio_port { |
| 63 | struct uarttio_uart *uart; |
| 64 | unsigned int tx_pin; |
| 65 | unsigned int rx_pin; |
| 66 | |
| 67 | struct uart_port port; |
| 68 | |
| 69 | u8_t added; |
| 70 | |
| 71 | /* |
| 72 | * If this value is set, the port has had its direction set already |
| 73 | */ |
| 74 | u8_t port_init; |
| 75 | }; |
| 76 | static struct ubi32_uarttio_port uarttio_ports[CONFIG_SERIAL_UBI32_UARTTIO_NR_UARTS]; |
| 77 | |
| 78 | /* |
| 79 | * Number of ports currently initialized |
| 80 | */ |
| 81 | static int uarttio_nports; |
| 82 | |
| 83 | /* |
| 84 | * Per device structure |
| 85 | */ |
| 86 | struct ubi32_uarttio_instance { |
| 87 | struct uarttio_regs *regs; |
| 88 | struct ubi32_uarttio_port *ports; |
| 89 | |
| 90 | u8_t irq_requested; |
| 91 | u8_t driver_registered; |
| 92 | u8_t irq; |
| 93 | }; |
| 94 | static struct ubi32_uarttio_instance uarttio_inst; |
| 95 | |
| 96 | #ifdef CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE |
| 97 | static struct console ubi32_uarttio_console; |
| 98 | #define UBI32_UARTTIO_CONSOLE &ubi32_uarttio_console |
| 99 | #else |
| 100 | #define UBI32_UARTTIO_CONSOLE NULL |
| 101 | #endif |
| 102 | |
| 103 | static struct uart_driver ubi32_uarttio_uart_driver = { |
| 104 | .owner = THIS_MODULE, |
| 105 | .driver_name = DRIVER_NAME, |
| 106 | .dev_name = UBI32_UARTTIO_NAME, |
| 107 | .major = UBI32_UARTTIO_MAJOR, |
| 108 | .minor = UBI32_UARTTIO_MINOR, |
| 109 | .cons = UBI32_UARTTIO_CONSOLE, |
| 110 | }; |
| 111 | |
| 112 | #ifdef UBI32_UARTTIO_UNUSED |
| 113 | /* |
| 114 | * ubi32_uarttio_get_send_space |
| 115 | */ |
| 116 | static int ubi32_uarttio_get_send_space(struct uarttio_uart *uart) |
| 117 | { |
| 118 | int count = uart->tx_fifo_head - uart->tx_fifo_tail; |
| 119 | if (count < 0) { |
| 120 | count += uart->tx_fifo_size; |
| 121 | } |
| 122 | return uart->tx_fifo_size - count; |
| 123 | } |
| 124 | #endif |
| 125 | |
| 126 | /* |
| 127 | * ubi32_uarttio_get_recv_ready |
| 128 | */ |
| 129 | static int ubi32_uarttio_get_recv_ready(struct uarttio_uart *uart) |
| 130 | { |
| 131 | int count = uart->rx_fifo_head - uart->rx_fifo_tail; |
| 132 | if (count < 0) { |
| 133 | count += uart->rx_fifo_size; |
| 134 | } |
| 135 | return count; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * ubi32_uarttio_get_char() |
| 140 | */ |
| 141 | static u8_t ubi32_uarttio_get_char(struct uarttio_uart *uart) |
| 142 | { |
| 143 | /* |
| 144 | * Retrieve byte |
| 145 | */ |
| 146 | u32_t tail = uart->rx_fifo_tail; |
| 147 | u8_t data = uart->rx_fifo[tail]; |
| 148 | |
| 149 | if (++tail == uart->rx_fifo_size) { |
| 150 | tail = 0; |
| 151 | } |
| 152 | uart->rx_fifo_tail = tail; |
| 153 | |
| 154 | return data; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * ubi32_uarttio_put_char() |
| 159 | */ |
| 160 | static int ubi32_uarttio_put_char(struct uarttio_uart *uart, u8_t c) |
| 161 | { |
| 162 | u32_t head = uart->tx_fifo_head; |
| 163 | u32_t prev = head; |
| 164 | |
| 165 | /* |
| 166 | * Wrap |
| 167 | */ |
| 168 | if (++head == uart->tx_fifo_size) { |
| 169 | head = 0; |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * If there isn't any space, return EBUSY |
| 174 | */ |
| 175 | if (head == uart->tx_fifo_tail) { |
| 176 | return -EBUSY; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Put the character in the queue |
| 181 | */ |
| 182 | uart->tx_fifo[prev] = c; |
| 183 | uart->tx_fifo_head = head; |
| 184 | |
| 185 | return 0; |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * ubi32_uarttio_set_baud |
| 190 | */ |
| 191 | static int ubi32_uarttio_set_baud(struct ubi32_uarttio_port *uup, unsigned int baud) |
| 192 | { |
| 193 | if (uup->uart->current_baud_rate == baud) { |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | uup->uart->baud_rate = baud; |
| 198 | uup->uart->flags |= UARTTIO_UART_FLAG_SET_RATE; |
| 199 | while (uup->uart->flags & UARTTIO_UART_FLAG_SET_RATE) { |
| 200 | cpu_relax(); |
| 201 | } |
| 202 | |
| 203 | if (uup->uart->current_baud_rate != baud) { |
| 204 | /* |
| 205 | * Failed to set baud rate |
| 206 | */ |
| 207 | printk(KERN_WARNING "Invalid baud rate %u, running at %u\n", baud, uup->uart->current_baud_rate); |
| 208 | return -EINVAL; |
| 209 | } |
| 210 | |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | /* |
| 215 | * ubi32_uarttio_handle_receive |
| 216 | */ |
| 217 | static void ubi32_uarttio_handle_receive(struct ubi32_uarttio_port *uup, int stat) |
| 218 | { |
| 219 | struct uarttio_uart *uart = uup->uart; |
| 220 | struct uart_port *port = &uup->port; |
| 221 | struct tty_struct *tty = port->info->port.tty; |
| 222 | unsigned char ch = 0; |
| 223 | char flag = TTY_NORMAL; |
| 224 | int count; |
| 225 | |
| 226 | if ((stat & (UARTTIO_UART_INT_RX | UARTTIO_UART_INT_RXFRAME | UARTTIO_UART_INT_RXOVF)) == 0) { |
| 227 | return; |
| 228 | } |
| 229 | |
| 230 | if (stat & UARTTIO_UART_INT_RX) { |
| 231 | count = ubi32_uarttio_get_recv_ready(uart); |
| 232 | port->icount.rx += count; |
| 233 | } |
| 234 | |
| 235 | if (stat & UARTTIO_UART_INT_RXOVF) { |
| 236 | port->icount.overrun++; |
| 237 | } |
| 238 | |
| 239 | if (stat & UARTTIO_UART_INT_RXFRAME) { |
| 240 | port->icount.frame++; |
| 241 | } |
| 242 | |
| 243 | stat &= ~port->ignore_status_mask; |
| 244 | |
| 245 | if (stat & UARTTIO_UART_INT_RX) { |
| 246 | int i; |
| 247 | for (i = 0; i < count; i++) { |
| 248 | ch = ubi32_uarttio_get_char(uart); |
| 249 | tty_insert_flip_char(tty, ch, flag); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | if (stat & UARTTIO_UART_INT_RXFRAME) { |
| 254 | tty_insert_flip_char(tty, 0, TTY_FRAME); |
| 255 | } |
| 256 | |
| 257 | if (stat & UARTTIO_UART_INT_RXOVF) { |
| 258 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * ubi32_uarttio_stop_tx |
| 264 | * interrupts are disabled on entry |
| 265 | */ |
| 266 | static void ubi32_uarttio_stop_tx(struct uart_port *port) |
| 267 | { |
| 268 | struct ubi32_uarttio_port *uup = port->private_data; |
| 269 | |
| 270 | uup->uart->int_mask &= ~UARTTIO_UART_INT_TXBE; |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * ubi32_uarttio_handle_transmit |
| 275 | */ |
| 276 | static void ubi32_uarttio_handle_transmit(struct ubi32_uarttio_port *uup, int stat) |
| 277 | { |
| 278 | struct uarttio_uart *uart = uup->uart; |
| 279 | struct uart_port *port = &uup->port; |
| 280 | struct circ_buf *xmit = &port->info->xmit; |
| 281 | |
| 282 | if (!(stat & UARTTIO_UART_INT_TXBE)) { |
| 283 | return; |
| 284 | } |
| 285 | |
| 286 | if (port->x_char) { |
| 287 | if (ubi32_uarttio_put_char(uart, port->x_char)) { |
| 288 | return; |
| 289 | } |
| 290 | port->x_char = 0; |
| 291 | port->icount.tx++; |
| 292 | return; |
| 293 | } |
| 294 | |
| 295 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { |
| 296 | ubi32_uarttio_stop_tx(port); |
| 297 | return; |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Send as many characters as we can |
| 302 | */ |
| 303 | while (ubi32_uarttio_put_char(uart, xmit->buf[xmit->tail]) == 0) { |
| 304 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 305 | port->icount.tx++; |
| 306 | if (uart_circ_empty(xmit)) { |
| 307 | break; |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | /* wake up */ |
| 312 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { |
| 313 | uart_write_wakeup(port); |
| 314 | } |
| 315 | |
| 316 | if (uart_circ_empty(xmit)) { |
| 317 | ubi32_uarttio_stop_tx(port); |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * ubi32_uarttio_start_tx |
| 323 | * port is locked and interrupts are disabled |
| 324 | */ |
| 325 | static void ubi32_uarttio_start_tx(struct uart_port *port) |
| 326 | { |
| 327 | struct ubi32_uarttio_port *uup = port->private_data; |
| 328 | struct uarttio_uart *uart = uup->uart; |
| 329 | |
| 330 | uart->int_mask |= UARTTIO_UART_INT_TXBE; |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * ubi32_uarttio_stop_rx |
| 335 | * Interrupts are enabled |
| 336 | */ |
| 337 | static void ubi32_uarttio_stop_rx(struct uart_port *port) |
| 338 | { |
| 339 | struct ubi32_uarttio_port *uup = port->private_data; |
| 340 | struct uarttio_uart *uart = uup->uart; |
| 341 | |
| 342 | /* |
| 343 | * don't forward any more data (like !CREAD) |
| 344 | */ |
| 345 | uart->int_mask &= ~UARTTIO_UART_INT_RX; |
| 346 | port->ignore_status_mask = UARTTIO_UART_INT_RX; |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * ubi32_uarttio_enable_ms |
| 351 | * Set the modem control timer to fire immediately. |
| 352 | */ |
| 353 | static void ubi32_uarttio_enable_ms(struct uart_port *port) |
| 354 | { |
| 355 | /* N/A */ |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * ubi32_uarttio_isr |
| 360 | */ |
| 361 | static irqreturn_t ubi32_uarttio_isr(int irq, void *appdata) |
| 362 | { |
| 363 | struct ubi32_uarttio_port *uup = uarttio_ports; |
| 364 | int i; |
| 365 | |
| 366 | /* |
| 367 | * Service all of the ports |
| 368 | */ |
| 369 | for (i = 0; i < uarttio_nports; i++) { |
| 370 | unsigned int flags; |
| 371 | |
| 372 | if (!(uup->uart->flags & UARTTIO_UART_FLAG_ENABLED)) { |
| 373 | uup++; |
| 374 | continue; |
| 375 | } |
| 376 | |
| 377 | spin_lock(&uup->port.lock); |
| 378 | |
| 379 | flags = uup->uart->int_flags; |
| 380 | |
| 381 | uup->uart->int_flags = 0; |
| 382 | |
| 383 | ubi32_uarttio_handle_receive(uup, flags); |
| 384 | ubi32_uarttio_handle_transmit(uup, flags); |
| 385 | |
| 386 | tty_flip_buffer_push(uup->port.info->port.tty); |
| 387 | |
| 388 | spin_unlock(&uup->port.lock); |
| 389 | |
| 390 | uup++; |
| 391 | } |
| 392 | |
| 393 | return IRQ_HANDLED; |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * ubi32_uarttio_tx_empty |
| 398 | * Return TIOCSER_TEMT when transmitter is not busy. |
| 399 | */ |
| 400 | static unsigned int ubi32_uarttio_tx_empty(struct uart_port *port) |
| 401 | { |
| 402 | struct ubi32_uarttio_port *uup = port->private_data; |
| 403 | |
| 404 | if (uup->uart->tx_fifo_head == uup->uart->tx_fifo_tail) { |
| 405 | return TIOCSER_TEMT; |
| 406 | } |
| 407 | |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | /* |
| 412 | * ubi32_uarttio_get_mctrl |
| 413 | */ |
| 414 | static unsigned int ubi32_uarttio_get_mctrl(struct uart_port *port) |
| 415 | { |
| 416 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * ubi32_uarttio_set_mctrl |
| 421 | */ |
| 422 | static void ubi32_uarttio_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 423 | { |
| 424 | /* N/A */ |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * ubi32_uarttio_break_ctl |
| 429 | */ |
| 430 | static void ubi32_uarttio_break_ctl(struct uart_port *port, int break_state) |
| 431 | { |
| 432 | /* N/A */ |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * ubi32_uarttio_startup |
| 437 | */ |
| 438 | static int ubi32_uarttio_startup(struct uart_port *port) |
| 439 | { |
| 440 | struct ubi32_uarttio_port *uup = port->private_data; |
| 441 | struct uarttio_uart *uart = uup->uart; |
| 442 | |
| 443 | uart->flags |= UARTTIO_UART_FLAG_ENABLED; |
| 444 | |
| 445 | uart->int_mask |= UARTTIO_UART_INT_TXBE | UARTTIO_UART_INT_RX; |
| 446 | |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * ubi32_uarttio_shutdown |
| 452 | */ |
| 453 | static void ubi32_uarttio_shutdown(struct uart_port *port) |
| 454 | { |
| 455 | struct ubi32_uarttio_port *uup = port->private_data; |
| 456 | struct uarttio_uart *uart = uup->uart; |
| 457 | |
| 458 | uart->int_mask = 0; |
| 459 | uart->flags &= ~UARTTIO_UART_FLAG_ENABLED; |
| 460 | } |
| 461 | |
| 462 | /* |
| 463 | * ubi32_uarttio_set_termios |
| 464 | */ |
| 465 | static void ubi32_uarttio_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) |
| 466 | { |
| 467 | struct ubi32_uarttio_port *uup = port->private_data; |
| 468 | unsigned long flags; |
| 469 | unsigned int baud; |
| 470 | |
| 471 | spin_lock_irqsave(&port->lock, flags); |
| 472 | |
| 473 | #if 0 |
| 474 | port->read_status_mask = UBI32_UARTTIO_RX | UBI32_UARTTIO_RXOVF | UBI32_UARTTIO_TXOVF; |
| 475 | |
| 476 | if (termios->c_iflag & INPCK) { |
| 477 | port->read_status_mask |= UBI32_UARTTIO_RXFRAME; |
| 478 | } |
| 479 | #endif |
| 480 | |
| 481 | port->ignore_status_mask = 0; |
| 482 | if (termios->c_iflag & IGNPAR) { |
| 483 | port->ignore_status_mask |= UARTTIO_UART_INT_RXFRAME | |
| 484 | UARTTIO_UART_INT_RXOVF; |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * ignore all characters if CREAD is not set |
| 489 | */ |
| 490 | if ((termios->c_cflag & CREAD) == 0) { |
| 491 | port->ignore_status_mask |= UARTTIO_UART_INT_RX | |
| 492 | UARTTIO_UART_INT_RXFRAME | |
| 493 | UARTTIO_UART_INT_RXOVF; |
| 494 | } |
| 495 | |
| 496 | /* update timeout */ |
| 497 | baud = uart_get_baud_rate(port, termios, old, 0, 460800); |
| 498 | uart_update_timeout(port, termios->c_cflag, baud); |
| 499 | |
| 500 | ubi32_uarttio_set_baud(uup, baud); |
| 501 | spin_unlock_irqrestore(&port->lock, flags); |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * ubi32_uarttio_type |
| 506 | */ |
| 507 | static const char *ubi32_uarttio_type(struct uart_port *port) |
| 508 | { |
| 509 | return (port->type == PORT_UBI32_UARTTIO) ? "UBI32_UARTTIO" : NULL; |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * ubi32_uarttio_release_port |
| 514 | * Release the memory region(s) being used by 'port'. |
| 515 | */ |
| 516 | static void ubi32_uarttio_release_port(struct uart_port *port) |
| 517 | { |
| 518 | } |
| 519 | |
| 520 | /* |
| 521 | * ubi32_uarttio_request_port |
| 522 | * Request the memory region(s) being used by 'port'. |
| 523 | */ |
| 524 | static int ubi32_uarttio_request_port(struct uart_port *port) |
| 525 | { |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | /* |
| 530 | * ubi32_uarttio_config_port |
| 531 | * Configure/autoconfigure the port. |
| 532 | */ |
| 533 | static void ubi32_uarttio_config_port(struct uart_port *port, int flags) |
| 534 | { |
| 535 | if ((flags & UART_CONFIG_TYPE) && (ubi32_uarttio_request_port(port) == 0)) { |
| 536 | port->type = PORT_UBI32_UARTTIO; |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * ubi32_uarttio_verify_port |
| 542 | * Verify the new serial_struct (for TIOCSSERIAL). |
| 543 | * |
| 544 | * The only change we allow are to the flags and type, and |
| 545 | * even then only between PORT_UBI32_UARTTIO and PORT_UNKNOWN |
| 546 | */ |
| 547 | static int ubi32_uarttio_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 548 | { |
| 549 | return 0; |
| 550 | } |
| 551 | |
| 552 | static struct uart_ops ubi32_uarttio_pops = { |
| 553 | .tx_empty = ubi32_uarttio_tx_empty, |
| 554 | .set_mctrl = ubi32_uarttio_set_mctrl, |
| 555 | .get_mctrl = ubi32_uarttio_get_mctrl, |
| 556 | .stop_tx = ubi32_uarttio_stop_tx, |
| 557 | .start_tx = ubi32_uarttio_start_tx, |
| 558 | .stop_rx = ubi32_uarttio_stop_rx, |
| 559 | .enable_ms = ubi32_uarttio_enable_ms, |
| 560 | .break_ctl = ubi32_uarttio_break_ctl, |
| 561 | .startup = ubi32_uarttio_startup, |
| 562 | .shutdown = ubi32_uarttio_shutdown, |
| 563 | .set_termios = ubi32_uarttio_set_termios, |
| 564 | .type = ubi32_uarttio_type, |
| 565 | .release_port = ubi32_uarttio_release_port, |
| 566 | .request_port = ubi32_uarttio_request_port, |
| 567 | .config_port = ubi32_uarttio_config_port, |
| 568 | .verify_port = ubi32_uarttio_verify_port, |
| 569 | }; |
| 570 | |
| 571 | /* |
| 572 | * ubi32_uarttio_add_ports |
| 573 | */ |
| 574 | static int __init ubi32_uarttio_add_ports(void) |
| 575 | { |
| 576 | int res = 0; |
| 577 | struct ubi32_uarttio_port *uup = uarttio_ports; |
| 578 | int i = 0; |
| 579 | |
| 580 | for (i = 0; i < uarttio_nports; i++) { |
| 581 | /* |
| 582 | * Setup the GPIOs |
| 583 | */ |
| 584 | res = gpio_request(uup->tx_pin, "ubi32_uarttio_tx"); |
| 585 | if (res) { |
| 586 | printk(KERN_WARNING "Failed to request GPIO %d\n", uup->tx_pin); |
| 587 | res = -EBUSY; |
| 588 | goto next; |
| 589 | } |
| 590 | |
| 591 | res = gpio_request(uup->rx_pin, "ubi32_uarttio_rx"); |
| 592 | if (res) { |
| 593 | gpio_free(uup->tx_pin); |
| 594 | printk(KERN_WARNING "Failed to request GPIO %d\n", uup->rx_pin); |
| 595 | res = -EBUSY; |
| 596 | goto next; |
| 597 | } |
| 598 | |
| 599 | res = uart_add_one_port(&ubi32_uarttio_uart_driver, &uup->port); |
| 600 | if (res) { |
| 601 | gpio_free(uup->rx_pin); |
| 602 | gpio_free(uup->tx_pin); |
| 603 | res = -ENODEV; |
| 604 | printk(KERN_WARNING "Failed to add port %d,%d\n", uup->tx_pin, uup->rx_pin); |
| 605 | goto next; |
| 606 | } |
| 607 | uup->added = 1; |
| 608 | |
| 609 | /* |
| 610 | * Set the direction of the ports now, after we're sure that everything is ok |
| 611 | */ |
| 612 | if (!uup->port_init) { |
| 613 | gpio_direction_output(uup->tx_pin, 1); |
| 614 | gpio_direction_input(uup->rx_pin); |
| 615 | } |
| 616 | |
| 617 | next: |
| 618 | uup++; |
| 619 | } |
| 620 | return res; |
| 621 | } |
| 622 | |
| 623 | /* |
| 624 | * ubi32_uarttio_cleanup |
| 625 | */ |
| 626 | static void ubi32_uarttio_cleanup(void) |
| 627 | { |
| 628 | struct ubi32_uarttio_port *uup; |
| 629 | int i; |
| 630 | |
| 631 | /* |
| 632 | * Stop the hardware thread |
| 633 | */ |
| 634 | if (uarttio_inst.regs) { |
| 635 | thread_disable(uarttio_inst.regs->thread); |
| 636 | } |
| 637 | if (uarttio_inst.irq_requested) { |
| 638 | free_irq(uarttio_inst.irq, NULL); |
| 639 | } |
| 640 | |
| 641 | /* |
| 642 | * Get rid of the ports |
| 643 | */ |
| 644 | uup = uarttio_inst.ports; |
| 645 | for (i = 0; i < uarttio_nports; i++) { |
| 646 | gpio_free(uup->tx_pin); |
| 647 | gpio_free(uup->rx_pin); |
| 648 | if (uup->added) { |
| 649 | uart_remove_one_port(&ubi32_uarttio_uart_driver, &uup->port); |
| 650 | } |
| 651 | uup++; |
| 652 | } |
| 653 | |
| 654 | if (uarttio_inst.driver_registered) { |
| 655 | uart_unregister_driver(&ubi32_uarttio_uart_driver); |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | /* |
| 660 | * ubi32_uarttio_setup_port |
| 661 | * Setup a port in the TIO registers |
| 662 | */ |
| 663 | static int ubi32_uarttio_setup_port(int index, |
| 664 | struct uarttio_uart *uart, |
| 665 | unsigned int baud, unsigned int tx_pin, |
| 666 | unsigned int rx_pin) |
| 667 | { |
| 668 | struct ubi32_uarttio_port *uup = &uarttio_ports[index]; |
| 669 | void *tx_port = ubi_gpio_get_port(tx_pin); |
| 670 | void *rx_port = ubi_gpio_get_port(rx_pin); |
| 671 | |
| 672 | /* |
| 673 | * Verify the ports are on chip |
| 674 | */ |
| 675 | if (!tx_port || !rx_port) { |
| 676 | printk(KERN_WARNING "Invalid port(s) specified: %u or %u\n", tx_pin, rx_pin); |
| 677 | return -EINVAL; |
| 678 | } |
| 679 | |
| 680 | uup->tx_pin = tx_pin; |
| 681 | uup->rx_pin = rx_pin; |
| 682 | uup->uart = uart; |
| 683 | |
| 684 | /* |
| 685 | * Setup the port structure |
| 686 | */ |
| 687 | uup->port.ops = &ubi32_uarttio_pops; |
| 688 | uup->port.line = index; |
| 689 | uup->port.iotype = UPIO_MEM; |
| 690 | uup->port.flags = UPF_BOOT_AUTOCONF; |
| 691 | uup->port.fifosize = uup->uart->tx_fifo_size; |
| 692 | uup->port.private_data = uup; |
| 693 | |
| 694 | /* |
| 695 | * We share this IRQ across all ports |
| 696 | */ |
| 697 | uup->port.irq = uarttio_inst.irq; |
| 698 | |
| 699 | /* |
| 700 | * We really don't have a mem/map base but without these variables |
| 701 | * set, the serial_core won't startup. |
| 702 | */ |
| 703 | uup->port.membase = (void __iomem *)uup; |
| 704 | uup->port.mapbase = (resource_size_t)uup; |
| 705 | spin_lock_init(&uup->port.lock); |
| 706 | |
| 707 | /* |
| 708 | * Set up the hardware |
| 709 | */ |
| 710 | uart->flags = UARTTIO_UART_FLAG_SET_RATE | UARTTIO_UART_FLAG_RESET; |
| 711 | |
| 712 | uart->tx_port = (unsigned int)tx_port; |
| 713 | uart->tx_pin = gpio_pin_index(tx_pin); |
| 714 | uart->tx_bits = 8; |
| 715 | uart->tx_stop_bits = 1; |
| 716 | |
| 717 | uart->rx_port = (unsigned int)rx_port; |
| 718 | uart->rx_pin = gpio_pin_index(rx_pin); |
| 719 | uart->rx_bits = 8; |
| 720 | uart->rx_stop_bits = 1; |
| 721 | |
| 722 | uart->baud_rate = baud; |
| 723 | |
| 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | enum ubi32_uarttio_parse_states { |
| 728 | UBI32_UARTTIO_PARSE_STATE_BAUD, |
| 729 | UBI32_UARTTIO_PARSE_STATE_TX_PIN, |
| 730 | UBI32_UARTTIO_PARSE_STATE_RX_PIN, |
| 731 | UBI32_UARTTIO_PARSE_STATE_HS, |
| 732 | UBI32_UARTTIO_PARSE_STATE_CTS_PIN, |
| 733 | UBI32_UARTTIO_PARSE_STATE_RTS_PIN, |
| 734 | }; |
| 735 | |
| 736 | /* |
| 737 | * ubi32_uarttio_parse_param |
| 738 | */ |
| 739 | static int ubi32_uarttio_parse_param(char *str) |
| 740 | { |
| 741 | int res; |
| 742 | int i; |
| 743 | int baud = 0; |
| 744 | int tx_pin = 0; |
| 745 | int rx_pin = 0; |
| 746 | int hs = 0; |
| 747 | int cts_pin = 0; |
| 748 | int rts_pin = 0; |
| 749 | int nfound = 0; |
| 750 | enum ubi32_uarttio_parse_states state = UBI32_UARTTIO_PARSE_STATE_BAUD; |
| 751 | struct uarttio_uart *uart = uarttio_inst.regs->uarts; |
| 752 | |
| 753 | /* |
| 754 | * Run though the options and generate the proper structures |
| 755 | */ |
| 756 | res = get_option(&str, &i); |
| 757 | while ((res == 2) || (res == 1)) { |
| 758 | switch (state) { |
| 759 | case UBI32_UARTTIO_PARSE_STATE_BAUD: |
| 760 | /* |
| 761 | * If we are here and nfound > 0 then create the port |
| 762 | * based on the previous input |
| 763 | */ |
| 764 | if (nfound) { |
| 765 | /* |
| 766 | * Create the port |
| 767 | */ |
| 768 | if (ubi32_uarttio_setup_port(nfound - 1, uart, baud, tx_pin, rx_pin)) { |
| 769 | /* |
| 770 | * Port was invalid |
| 771 | */ |
| 772 | goto fail; |
| 773 | } else { |
| 774 | printk(KERN_INFO "Serial port %d: tx=%d:rx=%d @ %d\n", nfound, tx_pin, rx_pin, baud); |
| 775 | uart++; |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | /* |
| 780 | * Reset the variables and go to the next state |
| 781 | */ |
| 782 | hs = 0; |
| 783 | baud = i; |
| 784 | state = UBI32_UARTTIO_PARSE_STATE_TX_PIN; |
| 785 | break; |
| 786 | |
| 787 | case UBI32_UARTTIO_PARSE_STATE_TX_PIN: |
| 788 | tx_pin = i; |
| 789 | state = UBI32_UARTTIO_PARSE_STATE_RX_PIN; |
| 790 | break; |
| 791 | |
| 792 | case UBI32_UARTTIO_PARSE_STATE_RX_PIN: |
| 793 | rx_pin = i; |
| 794 | state = UBI32_UARTTIO_PARSE_STATE_HS; |
| 795 | break; |
| 796 | |
| 797 | case UBI32_UARTTIO_PARSE_STATE_HS: |
| 798 | hs = i; |
| 799 | if (hs) { |
| 800 | state = UBI32_UARTTIO_PARSE_STATE_CTS_PIN; |
| 801 | break; |
| 802 | } |
| 803 | |
| 804 | if (nfound == uarttio_inst.regs->max_uarts) { |
| 805 | printk(KERN_WARNING "Maximum number of serial ports reached\n"); |
| 806 | goto done; |
| 807 | } |
| 808 | nfound++; |
| 809 | state = UBI32_UARTTIO_PARSE_STATE_BAUD; |
| 810 | break; |
| 811 | |
| 812 | case UBI32_UARTTIO_PARSE_STATE_CTS_PIN: |
| 813 | cts_pin = i; |
| 814 | state = UBI32_UARTTIO_PARSE_STATE_RTS_PIN; |
| 815 | break; |
| 816 | |
| 817 | case UBI32_UARTTIO_PARSE_STATE_RTS_PIN: |
| 818 | rts_pin = i; |
| 819 | |
| 820 | if (nfound == uarttio_inst.regs->max_uarts) { |
| 821 | printk(KERN_WARNING "Maximum number of serial ports reached\n"); |
| 822 | goto done; |
| 823 | } |
| 824 | nfound++; |
| 825 | state = UBI32_UARTTIO_PARSE_STATE_BAUD; |
| 826 | break; |
| 827 | } |
| 828 | res = get_option(&str, &i); |
| 829 | } |
| 830 | |
| 831 | if ((res > 2) || state != UBI32_UARTTIO_PARSE_STATE_BAUD) { |
| 832 | printk(KERN_WARNING "Parameter syntax error.\n"); |
| 833 | res = -EINVAL; |
| 834 | goto fail; |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Create the final port |
| 839 | */ |
| 840 | if (ubi32_uarttio_setup_port(nfound - 1, uart, baud, tx_pin, rx_pin)) { |
| 841 | goto fail; |
| 842 | } |
| 843 | printk(KERN_INFO "Serial port %d: tx=%d:rx=%d @ %d\n", nfound, tx_pin, rx_pin, baud); |
| 844 | |
| 845 | done: |
| 846 | uarttio_nports = nfound; |
| 847 | |
| 848 | return nfound ? 0 : -ENODEV; |
| 849 | |
| 850 | fail: |
| 851 | /* |
| 852 | * Reset the ports |
| 853 | */ |
| 854 | uart = uarttio_inst.regs->uarts; |
| 855 | for (i = 0; i < uarttio_inst.regs->max_uarts; i++) { |
| 856 | uart->flags = 0; |
| 857 | uart++; |
| 858 | } |
| 859 | |
| 860 | return res; |
| 861 | } |
| 862 | |
| 863 | /* |
| 864 | * ubi32_uarttio_probe |
| 865 | */ |
| 866 | static int ubi32_uarttio_probe(void) |
| 867 | { |
| 868 | int ret; |
| 869 | struct uarttio_node *uart_node; |
| 870 | char *str = utio_ports_param; |
| 871 | static int probed; |
| 872 | static int probe_result; |
| 873 | |
| 874 | /* |
| 875 | * We only want to be probed once, we could be probed twice |
| 876 | * for example if we are used as a console |
| 877 | */ |
| 878 | if (probed) { |
| 879 | return probe_result; |
| 880 | } |
| 881 | probed = 1; |
| 882 | |
| 883 | /* |
| 884 | * Extract the TIO name from the setup string |
| 885 | */ |
| 886 | while (*str) { |
| 887 | if (*str == ',') { |
| 888 | *str++ = 0; |
| 889 | break; |
| 890 | } |
| 891 | str++; |
| 892 | } |
| 893 | |
| 894 | if (!*str) { |
| 895 | probe_result = -EINVAL; |
| 896 | return -EINVAL; |
| 897 | } |
| 898 | |
| 899 | uart_node = (struct uarttio_node *)devtree_find_node(utio_ports_param); |
| 900 | if (!uart_node) { |
| 901 | probe_result = -ENODEV; |
| 902 | return -ENODEV; |
| 903 | } |
| 904 | |
| 905 | uarttio_inst.irq = uart_node->dn.recvirq; |
| 906 | uarttio_inst.regs = uart_node->regs; |
| 907 | |
| 908 | /* |
| 909 | * Parse module parameters. |
| 910 | */ |
| 911 | ret = ubi32_uarttio_parse_param(str); |
| 912 | if (ret != 0) { |
| 913 | ubi32_uarttio_cleanup(); |
| 914 | probe_result = ret; |
| 915 | return ret; |
| 916 | } |
| 917 | |
| 918 | ubi32_uarttio_uart_driver.nr = uarttio_nports; |
| 919 | |
| 920 | return 0; |
| 921 | } |
| 922 | |
| 923 | #if defined(CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE) |
| 924 | /* |
| 925 | * ubi32_uarttio_console_setup |
| 926 | */ |
| 927 | static int __init ubi32_uarttio_console_setup(struct console *co, char *options) |
| 928 | { |
| 929 | int baud; |
| 930 | int bits = 8; |
| 931 | int parity = 'n'; |
| 932 | int flow = 'n'; |
| 933 | struct ubi32_uarttio_port *uup; |
| 934 | |
| 935 | /* |
| 936 | * Check whether an invalid uart number has been specified, and |
| 937 | * if so, search for the first available port that does have |
| 938 | * console support. |
| 939 | */ |
| 940 | if (co->index == -1 || co->index >= uarttio_nports) { |
| 941 | co->index = 0; |
| 942 | } |
| 943 | uup = &uarttio_ports[co->index]; |
| 944 | baud = uup->uart->baud_rate; |
| 945 | uup->uart->flags |= UARTTIO_UART_FLAG_ENABLED; |
| 946 | |
| 947 | /* |
| 948 | * Setup the GPIOs |
| 949 | * We have to use the direct interface because the gpio |
| 950 | * subsystem is not available at this point. |
| 951 | */ |
| 952 | uup->port_init = 1; |
| 953 | UBICOM32_GPIO_SET_PIN_HIGH(uup->tx_pin); |
| 954 | UBICOM32_GPIO_SET_PIN_OUTPUT(uup->tx_pin); |
| 955 | UBICOM32_GPIO_SET_PIN_INPUT(uup->rx_pin); |
| 956 | |
| 957 | /* |
| 958 | * Start the thread |
| 959 | */ |
| 960 | thread_enable(uarttio_inst.regs->thread); |
| 961 | |
| 962 | /* |
| 963 | * Process options |
| 964 | */ |
| 965 | if (options) { |
| 966 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 967 | if (ubi32_uarttio_set_baud(uup, baud)) { |
| 968 | baud = uup->uart->current_baud_rate; |
| 969 | } |
| 970 | } |
| 971 | |
| 972 | return uart_set_options(&uup->port, co, baud, 'n', 8, 'n'); |
| 973 | } |
| 974 | |
| 975 | /* |
| 976 | * ubi32_uarttio_console_putchar |
| 977 | */ |
| 978 | static void ubi32_uarttio_console_putchar(struct uart_port *port, int ch) |
| 979 | { |
| 980 | struct ubi32_uarttio_port *uup = port->private_data; |
| 981 | |
| 982 | while (ubi32_uarttio_put_char(uup->uart, ch)) { |
| 983 | cpu_relax(); |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | /* |
| 988 | * ubi32_uarttio_console_write |
| 989 | * Interrupts are disabled on entering |
| 990 | */ |
| 991 | static void ubi32_uarttio_console_write(struct console *co, const char *s, unsigned int count) |
| 992 | { |
| 993 | struct uart_port *port = &(uarttio_ports[co->index].port); |
| 994 | unsigned long flags = 0; |
| 995 | |
| 996 | spin_lock_irqsave(&port->lock, flags); |
| 997 | uart_console_write(port, s, count, ubi32_uarttio_console_putchar); |
| 998 | spin_unlock_irqrestore(&port->lock, flags); |
| 999 | } |
| 1000 | |
| 1001 | static struct console ubi32_uarttio_console = { |
| 1002 | .name = UBI32_UARTTIO_NAME, |
| 1003 | .write = ubi32_uarttio_console_write, |
| 1004 | .device = uart_console_device, |
| 1005 | .setup = ubi32_uarttio_console_setup, |
| 1006 | .flags = CON_PRINTBUFFER, |
| 1007 | .index = -1, |
| 1008 | .data = &ubi32_uarttio_uart_driver, |
| 1009 | }; |
| 1010 | |
| 1011 | static int __init ubi32_uarttio_console_init(void) |
| 1012 | { |
| 1013 | int res; |
| 1014 | |
| 1015 | res = ubi32_uarttio_probe(); |
| 1016 | if (res) { |
| 1017 | return res; |
| 1018 | } |
| 1019 | |
| 1020 | register_console(&ubi32_uarttio_console); |
| 1021 | return 0; |
| 1022 | } |
| 1023 | console_initcall(ubi32_uarttio_console_init); |
| 1024 | #endif /* CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE */ |
| 1025 | |
| 1026 | /* |
| 1027 | * ubi32_serial_suspend |
| 1028 | */ |
| 1029 | static int ubi32_uarttio_suspend(struct platform_device *pdev, pm_message_t state) |
| 1030 | { |
| 1031 | int i; |
| 1032 | for (i = 0; i < uarttio_nports; i++) { |
| 1033 | uart_suspend_port(&ubi32_uarttio_uart_driver, &uarttio_ports[i].port); |
| 1034 | } |
| 1035 | |
| 1036 | return 0; |
| 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * ubi32_serial_resume |
| 1041 | */ |
| 1042 | static int ubi32_uarttio_resume(struct platform_device *pdev) |
| 1043 | { |
| 1044 | int i; |
| 1045 | for (i = 0; i < uarttio_nports; i++) { |
| 1046 | uart_resume_port(&ubi32_uarttio_uart_driver, &uarttio_ports[i].port); |
| 1047 | } |
| 1048 | |
| 1049 | return 0; |
| 1050 | } |
| 1051 | |
| 1052 | /* |
| 1053 | * ubi32_uarttio_remove |
| 1054 | */ |
| 1055 | static int __devexit ubi32_uarttio_remove(struct platform_device *pdev) |
| 1056 | { |
| 1057 | ubi32_uarttio_cleanup(); |
| 1058 | |
| 1059 | uart_unregister_driver(&ubi32_uarttio_uart_driver); |
| 1060 | |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | static struct platform_driver ubi32_uarttio_platform_driver = { |
| 1065 | .remove = __devexit_p(ubi32_uarttio_remove), |
| 1066 | .suspend = ubi32_uarttio_suspend, |
| 1067 | .resume = ubi32_uarttio_resume, |
| 1068 | .driver = { |
| 1069 | .name = DRIVER_NAME, |
| 1070 | .owner = THIS_MODULE, |
| 1071 | }, |
| 1072 | }; |
| 1073 | |
| 1074 | #ifndef MODULE |
| 1075 | /* |
| 1076 | * Called at boot time. |
| 1077 | * |
| 1078 | * uarttio=TIONAME,(baud,tx_pin,rx_pin,handshake[,cts_pin,rts_pin],...) |
| 1079 | * TIONAME is the name of the devtree node which describes the UARTTIO |
| 1080 | * pin is the index of the pin, i.e. PA4 is 5 [(port * 32) + pin] |
| 1081 | * handshake = 1 to enable handshaking, provide cts_pin, rts_pin (UNSUPPORTED) |
| 1082 | * handshake = 0 to disable handshaking, do not provide cts_pin, rts_pin |
| 1083 | * Ex: uarttio=UARTTIO,57600,7,6,0,9600,8,9,0 |
| 1084 | */ |
| 1085 | static int __init ubi32_uarttio_setup(char *str) |
| 1086 | { |
| 1087 | strncpy(utio_ports_param, str, UBI32_UARTTIO_MAX_PARAM_LEN); |
| 1088 | utio_ports_param[UBI32_UARTTIO_MAX_PARAM_LEN - 1] = 0; |
| 1089 | return 1; |
| 1090 | } |
| 1091 | __setup("uarttio=", ubi32_uarttio_setup); |
| 1092 | #endif |
| 1093 | |
| 1094 | /* |
| 1095 | * ubi32_uarttio_init |
| 1096 | */ |
| 1097 | static int __init ubi32_uarttio_init(void) |
| 1098 | { |
| 1099 | int ret; |
| 1100 | int i; |
| 1101 | |
| 1102 | ret = ubi32_uarttio_probe(); |
| 1103 | if (ret) { |
| 1104 | return ret; |
| 1105 | } |
| 1106 | |
| 1107 | /* |
| 1108 | * Request the IRQ (do it here since many ports share the same IRQ) |
| 1109 | */ |
| 1110 | ret = request_irq(uarttio_inst.irq, ubi32_uarttio_isr, IRQF_DISABLED, DRIVER_NAME, NULL); |
| 1111 | if (ret != 0) { |
| 1112 | printk(KERN_WARNING "Could not request IRQ %d\n", uarttio_inst.irq); |
| 1113 | goto fail; |
| 1114 | } |
| 1115 | uarttio_inst.irq_requested = 1; |
| 1116 | |
| 1117 | /* |
| 1118 | * Register the UART driver and add the ports |
| 1119 | */ |
| 1120 | ret = uart_register_driver(&ubi32_uarttio_uart_driver); |
| 1121 | if (ret != 0) { |
| 1122 | goto fail; |
| 1123 | } |
| 1124 | uarttio_inst.driver_registered = 1; |
| 1125 | |
| 1126 | ret = ubi32_uarttio_add_ports(); |
| 1127 | if (ret != 0) { |
| 1128 | ubi32_uarttio_cleanup(); |
| 1129 | return ret; |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * Start the thread |
| 1134 | */ |
| 1135 | thread_enable(uarttio_inst.regs->thread); |
| 1136 | |
| 1137 | for (i = 0; i < uarttio_nports; i++) { |
| 1138 | pr_info("Serial: Ubicom32 uarttio #%d: tx:%d rx:%d baud:%d\n", |
| 1139 | i, uarttio_ports[i].tx_pin, uarttio_ports[i].rx_pin, |
| 1140 | uarttio_ports[i].uart->current_baud_rate); |
| 1141 | } |
| 1142 | pr_info("Serial: Ubicom32 uarttio started on thread:%d irq:%d\n", uarttio_inst.regs->thread, uarttio_inst.irq); |
| 1143 | |
| 1144 | return ret; |
| 1145 | |
| 1146 | fail: |
| 1147 | ubi32_uarttio_cleanup(); |
| 1148 | return ret; |
| 1149 | } |
| 1150 | module_init(ubi32_uarttio_init); |
| 1151 | |
| 1152 | /* |
| 1153 | * ubi32_uarttio_exit |
| 1154 | */ |
| 1155 | static void __exit ubi32_uarttio_exit(void) |
| 1156 | { |
| 1157 | platform_driver_unregister(&ubi32_uarttio_platform_driver); |
| 1158 | } |
| 1159 | module_exit(ubi32_uarttio_exit); |
| 1160 | |
| 1161 | module_param_string(ports, utio_ports_param, sizeof(utio_ports_param), 0444); |
| 1162 | MODULE_PARM_DESC(ports, "Sets the ports to allocate: ports=TIONAME,(baud,txpin,rxpin,handshake[,ctspin,rtspin],...)\n" |
| 1163 | " TIONAME is the name of the devtree node which describes the UARTTIO\n" |
| 1164 | " pin is the index of the pin, i.e. PA4 is 5 [(port * 32) + pin]\n" |
| 1165 | " handshake = 1 to enable handshaking, provide ctspin, rtspin (UNSUPPORTED)\n" |
| 1166 | " handshake = 0 to disable handshaking, do not provide ctspin, rtspin\n" |
| 1167 | " Ex: ports=UARTTIO,57600,7,6,0,9600,8,9,0\n"); |
| 1168 | MODULE_AUTHOR("Patrick Tjin <pat.tjin@ubicom.com>"); |
| 1169 | MODULE_DESCRIPTION("Ubicom serial virtual peripherial driver"); |
| 1170 | MODULE_LICENSE("GPL"); |
| 1171 | MODULE_ALIAS_CHARDEV_MAJOR(UBI32_UARTTIO_MAJOR); |
| 1172 | MODULE_ALIAS("platform:" DRIVER_NAME); |
| 1173 | |
