Baruch Siach | 5930cb3 | 2014-12-18 21:45:24 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Driver for Conexant Digicolor serial ports (USART) |
| 3 | * |
| 4 | * Author: Baruch Siach <baruch@tkos.co.il> |
| 5 | * |
| 6 | * Copyright (C) 2014 Paradox Innovation Ltd. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/console.h> |
| 16 | #include <linux/serial_core.h> |
| 17 | #include <linux/serial.h> |
| 18 | #include <linux/clk.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/tty.h> |
| 21 | #include <linux/tty_flip.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/workqueue.h> |
| 25 | |
| 26 | #define UA_ENABLE 0x00 |
| 27 | #define UA_ENABLE_ENABLE BIT(0) |
| 28 | |
| 29 | #define UA_CONTROL 0x01 |
| 30 | #define UA_CONTROL_RX_ENABLE BIT(0) |
| 31 | #define UA_CONTROL_TX_ENABLE BIT(1) |
| 32 | #define UA_CONTROL_SOFT_RESET BIT(2) |
| 33 | |
| 34 | #define UA_STATUS 0x02 |
| 35 | #define UA_STATUS_PARITY_ERR BIT(0) |
| 36 | #define UA_STATUS_FRAME_ERR BIT(1) |
| 37 | #define UA_STATUS_OVERRUN_ERR BIT(2) |
| 38 | #define UA_STATUS_TX_READY BIT(6) |
| 39 | |
| 40 | #define UA_CONFIG 0x03 |
| 41 | #define UA_CONFIG_CHAR_LEN BIT(0) |
| 42 | #define UA_CONFIG_STOP_BITS BIT(1) |
| 43 | #define UA_CONFIG_PARITY BIT(2) |
| 44 | #define UA_CONFIG_ODD_PARITY BIT(4) |
| 45 | |
| 46 | #define UA_EMI_REC 0x04 |
| 47 | |
| 48 | #define UA_HBAUD_LO 0x08 |
| 49 | #define UA_HBAUD_HI 0x09 |
| 50 | |
| 51 | #define UA_STATUS_FIFO 0x0a |
| 52 | #define UA_STATUS_FIFO_RX_EMPTY BIT(2) |
| 53 | #define UA_STATUS_FIFO_RX_INT_ALMOST BIT(3) |
| 54 | #define UA_STATUS_FIFO_TX_FULL BIT(4) |
| 55 | #define UA_STATUS_FIFO_TX_INT_ALMOST BIT(7) |
| 56 | |
| 57 | #define UA_CONFIG_FIFO 0x0b |
| 58 | #define UA_CONFIG_FIFO_RX_THRESH 7 |
| 59 | #define UA_CONFIG_FIFO_RX_FIFO_MODE BIT(3) |
| 60 | #define UA_CONFIG_FIFO_TX_FIFO_MODE BIT(7) |
| 61 | |
| 62 | #define UA_INTFLAG_CLEAR 0x1c |
| 63 | #define UA_INTFLAG_SET 0x1d |
| 64 | #define UA_INT_ENABLE 0x1e |
| 65 | #define UA_INT_STATUS 0x1f |
| 66 | |
| 67 | #define UA_INT_TX BIT(0) |
| 68 | #define UA_INT_RX BIT(1) |
| 69 | |
| 70 | #define DIGICOLOR_USART_NR 3 |
| 71 | |
| 72 | /* |
| 73 | * We use the 16 bytes hardware FIFO to buffer Rx traffic. Rx interrupt is |
| 74 | * only produced when the FIFO is filled more than a certain configurable |
| 75 | * threshold. Unfortunately, there is no way to set this threshold below half |
| 76 | * FIFO. This means that we must periodically poll the FIFO status register to |
| 77 | * see whether there are waiting Rx bytes. |
| 78 | */ |
| 79 | |
| 80 | struct digicolor_port { |
| 81 | struct uart_port port; |
| 82 | struct delayed_work rx_poll_work; |
| 83 | }; |
| 84 | |
| 85 | static struct uart_port *digicolor_ports[DIGICOLOR_USART_NR]; |
| 86 | |
| 87 | static bool digicolor_uart_tx_full(struct uart_port *port) |
| 88 | { |
| 89 | return !!(readb_relaxed(port->membase + UA_STATUS_FIFO) & |
| 90 | UA_STATUS_FIFO_TX_FULL); |
| 91 | } |
| 92 | |
| 93 | static bool digicolor_uart_rx_empty(struct uart_port *port) |
| 94 | { |
| 95 | return !!(readb_relaxed(port->membase + UA_STATUS_FIFO) & |
| 96 | UA_STATUS_FIFO_RX_EMPTY); |
| 97 | } |
| 98 | |
| 99 | static void digicolor_uart_stop_tx(struct uart_port *port) |
| 100 | { |
| 101 | u8 int_enable = readb_relaxed(port->membase + UA_INT_ENABLE); |
| 102 | |
| 103 | int_enable &= ~UA_INT_TX; |
| 104 | writeb_relaxed(int_enable, port->membase + UA_INT_ENABLE); |
| 105 | } |
| 106 | |
| 107 | static void digicolor_uart_start_tx(struct uart_port *port) |
| 108 | { |
| 109 | u8 int_enable = readb_relaxed(port->membase + UA_INT_ENABLE); |
| 110 | |
| 111 | int_enable |= UA_INT_TX; |
| 112 | writeb_relaxed(int_enable, port->membase + UA_INT_ENABLE); |
| 113 | } |
| 114 | |
| 115 | static void digicolor_uart_stop_rx(struct uart_port *port) |
| 116 | { |
| 117 | u8 int_enable = readb_relaxed(port->membase + UA_INT_ENABLE); |
| 118 | |
| 119 | int_enable &= ~UA_INT_RX; |
| 120 | writeb_relaxed(int_enable, port->membase + UA_INT_ENABLE); |
| 121 | } |
| 122 | |
| 123 | static void digicolor_rx_poll(struct work_struct *work) |
| 124 | { |
| 125 | struct digicolor_port *dp = |
| 126 | container_of(to_delayed_work(work), |
| 127 | struct digicolor_port, rx_poll_work); |
| 128 | |
| 129 | if (!digicolor_uart_rx_empty(&dp->port)) |
| 130 | /* force RX interrupt */ |
| 131 | writeb_relaxed(UA_INT_RX, dp->port.membase + UA_INTFLAG_SET); |
| 132 | |
| 133 | schedule_delayed_work(&dp->rx_poll_work, msecs_to_jiffies(100)); |
| 134 | } |
| 135 | |
| 136 | static void digicolor_uart_rx(struct uart_port *port) |
| 137 | { |
| 138 | unsigned long flags; |
| 139 | |
| 140 | spin_lock_irqsave(&port->lock, flags); |
| 141 | |
| 142 | while (1) { |
| 143 | u8 status, ch; |
| 144 | unsigned int ch_flag; |
| 145 | |
| 146 | if (digicolor_uart_rx_empty(port)) |
| 147 | break; |
| 148 | |
| 149 | ch = readb_relaxed(port->membase + UA_EMI_REC); |
| 150 | status = readb_relaxed(port->membase + UA_STATUS); |
| 151 | |
| 152 | port->icount.rx++; |
| 153 | ch_flag = TTY_NORMAL; |
| 154 | |
| 155 | if (status) { |
| 156 | if (status & UA_STATUS_PARITY_ERR) |
| 157 | port->icount.parity++; |
| 158 | else if (status & UA_STATUS_FRAME_ERR) |
| 159 | port->icount.frame++; |
| 160 | else if (status & UA_STATUS_OVERRUN_ERR) |
| 161 | port->icount.overrun++; |
| 162 | |
| 163 | status &= port->read_status_mask; |
| 164 | |
| 165 | if (status & UA_STATUS_PARITY_ERR) |
| 166 | ch_flag = TTY_PARITY; |
| 167 | else if (status & UA_STATUS_FRAME_ERR) |
| 168 | ch_flag = TTY_FRAME; |
| 169 | else if (status & UA_STATUS_OVERRUN_ERR) |
| 170 | ch_flag = TTY_OVERRUN; |
| 171 | } |
| 172 | |
Baruch Siach | 5930cb3 | 2014-12-18 21:45:24 +0200 | [diff] [blame] | 173 | if (status & port->ignore_status_mask) |
| 174 | continue; |
| 175 | |
| 176 | uart_insert_char(port, status, UA_STATUS_OVERRUN_ERR, ch, |
| 177 | ch_flag); |
| 178 | } |
| 179 | |
| 180 | spin_unlock_irqrestore(&port->lock, flags); |
| 181 | |
| 182 | tty_flip_buffer_push(&port->state->port); |
| 183 | } |
| 184 | |
| 185 | static void digicolor_uart_tx(struct uart_port *port) |
| 186 | { |
| 187 | struct circ_buf *xmit = &port->state->xmit; |
| 188 | unsigned long flags; |
| 189 | |
| 190 | if (digicolor_uart_tx_full(port)) |
| 191 | return; |
| 192 | |
| 193 | spin_lock_irqsave(&port->lock, flags); |
| 194 | |
| 195 | if (port->x_char) { |
| 196 | writeb_relaxed(port->x_char, port->membase + UA_EMI_REC); |
| 197 | port->icount.tx++; |
| 198 | port->x_char = 0; |
| 199 | goto out; |
| 200 | } |
| 201 | |
| 202 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { |
| 203 | digicolor_uart_stop_tx(port); |
| 204 | goto out; |
| 205 | } |
| 206 | |
| 207 | while (!uart_circ_empty(xmit)) { |
| 208 | writeb(xmit->buf[xmit->tail], port->membase + UA_EMI_REC); |
| 209 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 210 | port->icount.tx++; |
| 211 | |
| 212 | if (digicolor_uart_tx_full(port)) |
| 213 | break; |
| 214 | } |
| 215 | |
| 216 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 217 | uart_write_wakeup(port); |
| 218 | |
| 219 | out: |
| 220 | spin_unlock_irqrestore(&port->lock, flags); |
| 221 | } |
| 222 | |
| 223 | static irqreturn_t digicolor_uart_int(int irq, void *dev_id) |
| 224 | { |
| 225 | struct uart_port *port = dev_id; |
| 226 | u8 int_status = readb_relaxed(port->membase + UA_INT_STATUS); |
| 227 | |
| 228 | writeb_relaxed(UA_INT_RX | UA_INT_TX, |
| 229 | port->membase + UA_INTFLAG_CLEAR); |
| 230 | |
| 231 | if (int_status & UA_INT_RX) |
| 232 | digicolor_uart_rx(port); |
| 233 | if (int_status & UA_INT_TX) |
| 234 | digicolor_uart_tx(port); |
| 235 | |
| 236 | return IRQ_HANDLED; |
| 237 | } |
| 238 | |
| 239 | static unsigned int digicolor_uart_tx_empty(struct uart_port *port) |
| 240 | { |
| 241 | u8 status = readb_relaxed(port->membase + UA_STATUS); |
| 242 | |
| 243 | return (status & UA_STATUS_TX_READY) ? TIOCSER_TEMT : 0; |
| 244 | } |
| 245 | |
| 246 | static unsigned int digicolor_uart_get_mctrl(struct uart_port *port) |
| 247 | { |
| 248 | return TIOCM_CTS; |
| 249 | } |
| 250 | |
| 251 | static void digicolor_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 252 | { |
| 253 | } |
| 254 | |
| 255 | static void digicolor_uart_break_ctl(struct uart_port *port, int state) |
| 256 | { |
| 257 | } |
| 258 | |
| 259 | static int digicolor_uart_startup(struct uart_port *port) |
| 260 | { |
| 261 | struct digicolor_port *dp = |
| 262 | container_of(port, struct digicolor_port, port); |
| 263 | |
| 264 | writeb_relaxed(UA_ENABLE_ENABLE, port->membase + UA_ENABLE); |
| 265 | writeb_relaxed(UA_CONTROL_SOFT_RESET, port->membase + UA_CONTROL); |
| 266 | writeb_relaxed(0, port->membase + UA_CONTROL); |
| 267 | |
| 268 | writeb_relaxed(UA_CONFIG_FIFO_RX_FIFO_MODE |
| 269 | | UA_CONFIG_FIFO_TX_FIFO_MODE | UA_CONFIG_FIFO_RX_THRESH, |
| 270 | port->membase + UA_CONFIG_FIFO); |
| 271 | writeb_relaxed(UA_STATUS_FIFO_RX_INT_ALMOST, |
| 272 | port->membase + UA_STATUS_FIFO); |
| 273 | writeb_relaxed(UA_CONTROL_RX_ENABLE | UA_CONTROL_TX_ENABLE, |
| 274 | port->membase + UA_CONTROL); |
| 275 | writeb_relaxed(UA_INT_TX | UA_INT_RX, |
| 276 | port->membase + UA_INT_ENABLE); |
| 277 | |
| 278 | schedule_delayed_work(&dp->rx_poll_work, msecs_to_jiffies(100)); |
| 279 | |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static void digicolor_uart_shutdown(struct uart_port *port) |
| 284 | { |
| 285 | struct digicolor_port *dp = |
| 286 | container_of(port, struct digicolor_port, port); |
| 287 | |
| 288 | writeb_relaxed(0, port->membase + UA_ENABLE); |
| 289 | cancel_delayed_work_sync(&dp->rx_poll_work); |
| 290 | } |
| 291 | |
| 292 | static void digicolor_uart_set_termios(struct uart_port *port, |
| 293 | struct ktermios *termios, |
| 294 | struct ktermios *old) |
| 295 | { |
| 296 | unsigned int baud, divisor; |
| 297 | u8 config = 0; |
| 298 | unsigned long flags; |
| 299 | |
| 300 | /* Mask termios capabilities we don't support */ |
| 301 | termios->c_cflag &= ~CMSPAR; |
| 302 | termios->c_iflag &= ~(BRKINT | IGNBRK); |
| 303 | |
| 304 | /* Limit baud rates so that we don't need the fractional divider */ |
| 305 | baud = uart_get_baud_rate(port, termios, old, |
| 306 | port->uartclk / (0x10000*16), |
| 307 | port->uartclk / 256); |
| 308 | divisor = uart_get_divisor(port, baud) - 1; |
| 309 | |
| 310 | switch (termios->c_cflag & CSIZE) { |
| 311 | case CS7: |
| 312 | break; |
| 313 | case CS8: |
| 314 | default: |
| 315 | config |= UA_CONFIG_CHAR_LEN; |
| 316 | break; |
| 317 | } |
| 318 | |
| 319 | if (termios->c_cflag & CSTOPB) |
| 320 | config |= UA_CONFIG_STOP_BITS; |
| 321 | |
| 322 | if (termios->c_cflag & PARENB) { |
| 323 | config |= UA_CONFIG_PARITY; |
| 324 | if (termios->c_cflag & PARODD) |
| 325 | config |= UA_CONFIG_ODD_PARITY; |
| 326 | } |
| 327 | |
| 328 | /* Set read status mask */ |
| 329 | port->read_status_mask = UA_STATUS_OVERRUN_ERR; |
| 330 | if (termios->c_iflag & INPCK) |
| 331 | port->read_status_mask |= UA_STATUS_PARITY_ERR |
| 332 | | UA_STATUS_FRAME_ERR; |
| 333 | |
| 334 | /* Set status ignore mask */ |
| 335 | port->ignore_status_mask = 0; |
| 336 | if (!(termios->c_cflag & CREAD)) |
| 337 | port->ignore_status_mask |= UA_STATUS_OVERRUN_ERR |
| 338 | | UA_STATUS_PARITY_ERR | UA_STATUS_FRAME_ERR; |
| 339 | |
| 340 | spin_lock_irqsave(&port->lock, flags); |
| 341 | |
| 342 | uart_update_timeout(port, termios->c_cflag, baud); |
| 343 | |
| 344 | writeb_relaxed(config, port->membase + UA_CONFIG); |
| 345 | writeb_relaxed(divisor & 0xff, port->membase + UA_HBAUD_LO); |
| 346 | writeb_relaxed(divisor >> 8, port->membase + UA_HBAUD_HI); |
| 347 | |
| 348 | spin_unlock_irqrestore(&port->lock, flags); |
| 349 | } |
| 350 | |
| 351 | static const char *digicolor_uart_type(struct uart_port *port) |
| 352 | { |
| 353 | return (port->type == PORT_DIGICOLOR) ? "DIGICOLOR USART" : NULL; |
| 354 | } |
| 355 | |
| 356 | static void digicolor_uart_config_port(struct uart_port *port, int flags) |
| 357 | { |
| 358 | if (flags & UART_CONFIG_TYPE) |
| 359 | port->type = PORT_DIGICOLOR; |
| 360 | } |
| 361 | |
| 362 | static void digicolor_uart_release_port(struct uart_port *port) |
| 363 | { |
| 364 | } |
| 365 | |
| 366 | static int digicolor_uart_request_port(struct uart_port *port) |
| 367 | { |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static const struct uart_ops digicolor_uart_ops = { |
| 372 | .tx_empty = digicolor_uart_tx_empty, |
| 373 | .set_mctrl = digicolor_uart_set_mctrl, |
| 374 | .get_mctrl = digicolor_uart_get_mctrl, |
| 375 | .stop_tx = digicolor_uart_stop_tx, |
| 376 | .start_tx = digicolor_uart_start_tx, |
| 377 | .stop_rx = digicolor_uart_stop_rx, |
| 378 | .break_ctl = digicolor_uart_break_ctl, |
| 379 | .startup = digicolor_uart_startup, |
| 380 | .shutdown = digicolor_uart_shutdown, |
| 381 | .set_termios = digicolor_uart_set_termios, |
| 382 | .type = digicolor_uart_type, |
| 383 | .config_port = digicolor_uart_config_port, |
| 384 | .release_port = digicolor_uart_release_port, |
| 385 | .request_port = digicolor_uart_request_port, |
| 386 | }; |
| 387 | |
| 388 | static void digicolor_uart_console_putchar(struct uart_port *port, int ch) |
| 389 | { |
| 390 | while (digicolor_uart_tx_full(port)) |
| 391 | cpu_relax(); |
| 392 | |
| 393 | writeb_relaxed(ch, port->membase + UA_EMI_REC); |
| 394 | } |
| 395 | |
| 396 | static void digicolor_uart_console_write(struct console *co, const char *c, |
| 397 | unsigned n) |
| 398 | { |
| 399 | struct uart_port *port = digicolor_ports[co->index]; |
| 400 | u8 status; |
| 401 | unsigned long flags; |
| 402 | int locked = 1; |
| 403 | |
Baruch Siach | c0b18db | 2015-01-14 08:04:21 +0200 | [diff] [blame] | 404 | if (oops_in_progress) |
Baruch Siach | 5930cb3 | 2014-12-18 21:45:24 +0200 | [diff] [blame] | 405 | locked = spin_trylock_irqsave(&port->lock, flags); |
| 406 | else |
| 407 | spin_lock_irqsave(&port->lock, flags); |
| 408 | |
| 409 | uart_console_write(port, c, n, digicolor_uart_console_putchar); |
| 410 | |
| 411 | if (locked) |
| 412 | spin_unlock_irqrestore(&port->lock, flags); |
| 413 | |
| 414 | /* Wait for transmitter to become empty */ |
| 415 | do { |
| 416 | status = readb_relaxed(port->membase + UA_STATUS); |
| 417 | } while ((status & UA_STATUS_TX_READY) == 0); |
| 418 | } |
| 419 | |
| 420 | static int digicolor_uart_console_setup(struct console *co, char *options) |
| 421 | { |
| 422 | int baud = 115200, bits = 8, parity = 'n', flow = 'n'; |
| 423 | struct uart_port *port; |
| 424 | |
| 425 | if (co->index < 0 || co->index >= DIGICOLOR_USART_NR) |
| 426 | return -EINVAL; |
| 427 | |
| 428 | port = digicolor_ports[co->index]; |
| 429 | if (!port) |
| 430 | return -ENODEV; |
| 431 | |
| 432 | if (options) |
| 433 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 434 | |
| 435 | return uart_set_options(port, co, baud, parity, bits, flow); |
| 436 | } |
| 437 | |
| 438 | static struct console digicolor_console = { |
| 439 | .name = "ttyS", |
| 440 | .device = uart_console_device, |
| 441 | .write = digicolor_uart_console_write, |
| 442 | .setup = digicolor_uart_console_setup, |
| 443 | .flags = CON_PRINTBUFFER, |
| 444 | .index = -1, |
| 445 | }; |
| 446 | |
| 447 | static struct uart_driver digicolor_uart = { |
| 448 | .driver_name = "digicolor-usart", |
| 449 | .dev_name = "ttyS", |
| 450 | .nr = DIGICOLOR_USART_NR, |
| 451 | }; |
| 452 | |
| 453 | static int digicolor_uart_probe(struct platform_device *pdev) |
| 454 | { |
| 455 | struct device_node *np = pdev->dev.of_node; |
Guenter Roeck | dd9b5588 | 2016-02-09 07:08:59 -0800 | [diff] [blame] | 456 | int irq, ret, index; |
Baruch Siach | 5930cb3 | 2014-12-18 21:45:24 +0200 | [diff] [blame] | 457 | struct digicolor_port *dp; |
| 458 | struct resource *res; |
| 459 | struct clk *uart_clk; |
| 460 | |
| 461 | if (!np) { |
| 462 | dev_err(&pdev->dev, "Missing device tree node\n"); |
| 463 | return -ENXIO; |
| 464 | } |
| 465 | |
| 466 | index = of_alias_get_id(np, "serial"); |
| 467 | if (index < 0 || index >= DIGICOLOR_USART_NR) |
| 468 | return -EINVAL; |
| 469 | |
| 470 | dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL); |
| 471 | if (!dp) |
| 472 | return -ENOMEM; |
| 473 | |
| 474 | uart_clk = devm_clk_get(&pdev->dev, NULL); |
| 475 | if (IS_ERR(uart_clk)) |
| 476 | return PTR_ERR(uart_clk); |
| 477 | |
| 478 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 479 | dp->port.mapbase = res->start; |
| 480 | dp->port.membase = devm_ioremap_resource(&pdev->dev, res); |
| 481 | if (IS_ERR(dp->port.membase)) |
| 482 | return PTR_ERR(dp->port.membase); |
| 483 | |
Guenter Roeck | dd9b5588 | 2016-02-09 07:08:59 -0800 | [diff] [blame] | 484 | irq = platform_get_irq(pdev, 0); |
| 485 | if (irq < 0) |
| 486 | return irq; |
| 487 | dp->port.irq = irq; |
Baruch Siach | 5930cb3 | 2014-12-18 21:45:24 +0200 | [diff] [blame] | 488 | |
| 489 | dp->port.iotype = UPIO_MEM; |
| 490 | dp->port.uartclk = clk_get_rate(uart_clk); |
| 491 | dp->port.fifosize = 16; |
| 492 | dp->port.dev = &pdev->dev; |
| 493 | dp->port.ops = &digicolor_uart_ops; |
| 494 | dp->port.line = index; |
| 495 | dp->port.type = PORT_DIGICOLOR; |
| 496 | spin_lock_init(&dp->port.lock); |
| 497 | |
| 498 | digicolor_ports[index] = &dp->port; |
| 499 | platform_set_drvdata(pdev, &dp->port); |
| 500 | |
| 501 | INIT_DELAYED_WORK(&dp->rx_poll_work, digicolor_rx_poll); |
| 502 | |
| 503 | ret = devm_request_irq(&pdev->dev, dp->port.irq, digicolor_uart_int, 0, |
| 504 | dev_name(&pdev->dev), &dp->port); |
| 505 | if (ret) |
| 506 | return ret; |
| 507 | |
| 508 | return uart_add_one_port(&digicolor_uart, &dp->port); |
| 509 | } |
| 510 | |
| 511 | static int digicolor_uart_remove(struct platform_device *pdev) |
| 512 | { |
| 513 | struct uart_port *port = platform_get_drvdata(pdev); |
| 514 | |
| 515 | uart_remove_one_port(&digicolor_uart, port); |
| 516 | |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | static const struct of_device_id digicolor_uart_dt_ids[] = { |
| 521 | { .compatible = "cnxt,cx92755-usart", }, |
| 522 | { } |
| 523 | }; |
| 524 | MODULE_DEVICE_TABLE(of, digicolor_uart_dt_ids); |
| 525 | |
| 526 | static struct platform_driver digicolor_uart_platform = { |
| 527 | .driver = { |
| 528 | .name = "digicolor-usart", |
| 529 | .of_match_table = of_match_ptr(digicolor_uart_dt_ids), |
| 530 | }, |
| 531 | .probe = digicolor_uart_probe, |
| 532 | .remove = digicolor_uart_remove, |
| 533 | }; |
| 534 | |
| 535 | static int __init digicolor_uart_init(void) |
| 536 | { |
| 537 | int ret; |
| 538 | |
| 539 | if (IS_ENABLED(CONFIG_SERIAL_CONEXANT_DIGICOLOR_CONSOLE)) { |
| 540 | digicolor_uart.cons = &digicolor_console; |
| 541 | digicolor_console.data = &digicolor_uart; |
| 542 | } |
| 543 | |
| 544 | ret = uart_register_driver(&digicolor_uart); |
| 545 | if (ret) |
| 546 | return ret; |
| 547 | |
| 548 | return platform_driver_register(&digicolor_uart_platform); |
| 549 | } |
| 550 | module_init(digicolor_uart_init); |
| 551 | |
| 552 | static void __exit digicolor_uart_exit(void) |
| 553 | { |
| 554 | platform_driver_unregister(&digicolor_uart_platform); |
| 555 | uart_unregister_driver(&digicolor_uart); |
| 556 | } |
| 557 | module_exit(digicolor_uart_exit); |
| 558 | |
| 559 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); |
| 560 | MODULE_DESCRIPTION("Conexant Digicolor USART serial driver"); |
| 561 | MODULE_LICENSE("GPL"); |