Vladimir Murzin | 041f031 | 2016-04-25 09:47:47 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 ARM Limited |
| 3 | * |
| 4 | * Author: Vladimir Murzin <vladimir.murzin@arm.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * TODO: support for SysRq |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
| 15 | #include <linux/bitops.h> |
| 16 | #include <linux/clk.h> |
| 17 | #include <linux/console.h> |
| 18 | #include <linux/io.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/of_device.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/serial_core.h> |
| 25 | #include <linux/tty_flip.h> |
| 26 | #include <linux/types.h> |
| 27 | |
| 28 | #define SERIAL_NAME "ttyMPS" |
| 29 | #define DRIVER_NAME "mps2-uart" |
| 30 | #define MAKE_NAME(x) (DRIVER_NAME # x) |
| 31 | |
| 32 | #define UARTn_DATA 0x00 |
| 33 | |
| 34 | #define UARTn_STATE 0x04 |
| 35 | #define UARTn_STATE_TX_FULL BIT(0) |
| 36 | #define UARTn_STATE_RX_FULL BIT(1) |
| 37 | #define UARTn_STATE_TX_OVERRUN BIT(2) |
| 38 | #define UARTn_STATE_RX_OVERRUN BIT(3) |
| 39 | |
| 40 | #define UARTn_CTRL 0x08 |
| 41 | #define UARTn_CTRL_TX_ENABLE BIT(0) |
| 42 | #define UARTn_CTRL_RX_ENABLE BIT(1) |
| 43 | #define UARTn_CTRL_TX_INT_ENABLE BIT(2) |
| 44 | #define UARTn_CTRL_RX_INT_ENABLE BIT(3) |
| 45 | #define UARTn_CTRL_TX_OVERRUN_INT_ENABLE BIT(4) |
| 46 | #define UARTn_CTRL_RX_OVERRUN_INT_ENABLE BIT(5) |
| 47 | |
| 48 | #define UARTn_INT 0x0c |
| 49 | #define UARTn_INT_TX BIT(0) |
| 50 | #define UARTn_INT_RX BIT(1) |
| 51 | #define UARTn_INT_TX_OVERRUN BIT(2) |
| 52 | #define UARTn_INT_RX_OVERRUN BIT(3) |
| 53 | |
| 54 | #define UARTn_BAUDDIV 0x10 |
| 55 | #define UARTn_BAUDDIV_MASK GENMASK(20, 0) |
| 56 | |
| 57 | /* |
| 58 | * Helpers to make typical enable/disable operations more readable. |
| 59 | */ |
| 60 | #define UARTn_CTRL_TX_GRP (UARTn_CTRL_TX_ENABLE |\ |
| 61 | UARTn_CTRL_TX_INT_ENABLE |\ |
| 62 | UARTn_CTRL_TX_OVERRUN_INT_ENABLE) |
| 63 | |
| 64 | #define UARTn_CTRL_RX_GRP (UARTn_CTRL_RX_ENABLE |\ |
| 65 | UARTn_CTRL_RX_INT_ENABLE |\ |
| 66 | UARTn_CTRL_RX_OVERRUN_INT_ENABLE) |
| 67 | |
| 68 | #define MPS2_MAX_PORTS 3 |
| 69 | |
| 70 | struct mps2_uart_port { |
| 71 | struct uart_port port; |
| 72 | struct clk *clk; |
| 73 | unsigned int tx_irq; |
| 74 | unsigned int rx_irq; |
| 75 | }; |
| 76 | |
| 77 | static inline struct mps2_uart_port *to_mps2_port(struct uart_port *port) |
| 78 | { |
| 79 | return container_of(port, struct mps2_uart_port, port); |
| 80 | } |
| 81 | |
| 82 | static void mps2_uart_write8(struct uart_port *port, u8 val, unsigned int off) |
| 83 | { |
| 84 | struct mps2_uart_port *mps_port = to_mps2_port(port); |
| 85 | |
| 86 | writeb(val, mps_port->port.membase + off); |
| 87 | } |
| 88 | |
| 89 | static u8 mps2_uart_read8(struct uart_port *port, unsigned int off) |
| 90 | { |
| 91 | struct mps2_uart_port *mps_port = to_mps2_port(port); |
| 92 | |
| 93 | return readb(mps_port->port.membase + off); |
| 94 | } |
| 95 | |
| 96 | static void mps2_uart_write32(struct uart_port *port, u32 val, unsigned int off) |
| 97 | { |
| 98 | struct mps2_uart_port *mps_port = to_mps2_port(port); |
| 99 | |
| 100 | writel_relaxed(val, mps_port->port.membase + off); |
| 101 | } |
| 102 | |
| 103 | static unsigned int mps2_uart_tx_empty(struct uart_port *port) |
| 104 | { |
| 105 | u8 status = mps2_uart_read8(port, UARTn_STATE); |
| 106 | |
| 107 | return (status & UARTn_STATE_TX_FULL) ? 0 : TIOCSER_TEMT; |
| 108 | } |
| 109 | |
| 110 | static void mps2_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 111 | { |
| 112 | } |
| 113 | |
| 114 | static unsigned int mps2_uart_get_mctrl(struct uart_port *port) |
| 115 | { |
| 116 | return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR; |
| 117 | } |
| 118 | |
| 119 | static void mps2_uart_stop_tx(struct uart_port *port) |
| 120 | { |
| 121 | u8 control = mps2_uart_read8(port, UARTn_CTRL); |
| 122 | |
| 123 | control &= ~UARTn_CTRL_TX_INT_ENABLE; |
| 124 | |
| 125 | mps2_uart_write8(port, control, UARTn_CTRL); |
| 126 | } |
| 127 | |
| 128 | static void mps2_uart_tx_chars(struct uart_port *port) |
| 129 | { |
| 130 | struct circ_buf *xmit = &port->state->xmit; |
| 131 | |
| 132 | while (!(mps2_uart_read8(port, UARTn_STATE) & UARTn_STATE_TX_FULL)) { |
| 133 | if (port->x_char) { |
| 134 | mps2_uart_write8(port, port->x_char, UARTn_DATA); |
| 135 | port->x_char = 0; |
| 136 | port->icount.tx++; |
| 137 | continue; |
| 138 | } |
| 139 | |
| 140 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) |
| 141 | break; |
| 142 | |
| 143 | mps2_uart_write8(port, xmit->buf[xmit->tail], UARTn_DATA); |
| 144 | xmit->tail = (xmit->tail + 1) % UART_XMIT_SIZE; |
| 145 | port->icount.tx++; |
| 146 | } |
| 147 | |
| 148 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 149 | uart_write_wakeup(port); |
| 150 | |
| 151 | if (uart_circ_empty(xmit)) |
| 152 | mps2_uart_stop_tx(port); |
| 153 | } |
| 154 | |
| 155 | static void mps2_uart_start_tx(struct uart_port *port) |
| 156 | { |
| 157 | u8 control = mps2_uart_read8(port, UARTn_CTRL); |
| 158 | |
| 159 | control |= UARTn_CTRL_TX_INT_ENABLE; |
| 160 | |
| 161 | mps2_uart_write8(port, control, UARTn_CTRL); |
| 162 | |
| 163 | /* |
| 164 | * We've just unmasked the TX IRQ and now slow-starting via |
| 165 | * polling; if there is enough data to fill up the internal |
| 166 | * write buffer in one go, the TX IRQ should assert, at which |
| 167 | * point we switch to fully interrupt-driven TX. |
| 168 | */ |
| 169 | |
| 170 | mps2_uart_tx_chars(port); |
| 171 | } |
| 172 | |
| 173 | static void mps2_uart_stop_rx(struct uart_port *port) |
| 174 | { |
| 175 | u8 control = mps2_uart_read8(port, UARTn_CTRL); |
| 176 | |
| 177 | control &= ~UARTn_CTRL_RX_GRP; |
| 178 | |
| 179 | mps2_uart_write8(port, control, UARTn_CTRL); |
| 180 | } |
| 181 | |
| 182 | static void mps2_uart_break_ctl(struct uart_port *port, int ctl) |
| 183 | { |
| 184 | } |
| 185 | |
| 186 | static void mps2_uart_rx_chars(struct uart_port *port) |
| 187 | { |
| 188 | struct tty_port *tport = &port->state->port; |
| 189 | |
| 190 | while (mps2_uart_read8(port, UARTn_STATE) & UARTn_STATE_RX_FULL) { |
| 191 | u8 rxdata = mps2_uart_read8(port, UARTn_DATA); |
| 192 | |
| 193 | port->icount.rx++; |
| 194 | tty_insert_flip_char(&port->state->port, rxdata, TTY_NORMAL); |
| 195 | } |
| 196 | |
| 197 | tty_flip_buffer_push(tport); |
| 198 | } |
| 199 | |
| 200 | static irqreturn_t mps2_uart_rxirq(int irq, void *data) |
| 201 | { |
| 202 | struct uart_port *port = data; |
| 203 | u8 irqflag = mps2_uart_read8(port, UARTn_INT); |
| 204 | |
| 205 | if (unlikely(!(irqflag & UARTn_INT_RX))) |
| 206 | return IRQ_NONE; |
| 207 | |
| 208 | spin_lock(&port->lock); |
| 209 | |
| 210 | mps2_uart_write8(port, UARTn_INT_RX, UARTn_INT); |
| 211 | mps2_uart_rx_chars(port); |
| 212 | |
| 213 | spin_unlock(&port->lock); |
| 214 | |
| 215 | return IRQ_HANDLED; |
| 216 | } |
| 217 | |
| 218 | static irqreturn_t mps2_uart_txirq(int irq, void *data) |
| 219 | { |
| 220 | struct uart_port *port = data; |
| 221 | u8 irqflag = mps2_uart_read8(port, UARTn_INT); |
| 222 | |
| 223 | if (unlikely(!(irqflag & UARTn_INT_TX))) |
| 224 | return IRQ_NONE; |
| 225 | |
| 226 | spin_lock(&port->lock); |
| 227 | |
| 228 | mps2_uart_write8(port, UARTn_INT_TX, UARTn_INT); |
| 229 | mps2_uart_tx_chars(port); |
| 230 | |
| 231 | spin_unlock(&port->lock); |
| 232 | |
| 233 | return IRQ_HANDLED; |
| 234 | } |
| 235 | |
| 236 | static irqreturn_t mps2_uart_oerrirq(int irq, void *data) |
| 237 | { |
| 238 | irqreturn_t handled = IRQ_NONE; |
| 239 | struct uart_port *port = data; |
| 240 | u8 irqflag = mps2_uart_read8(port, UARTn_INT); |
| 241 | |
| 242 | spin_lock(&port->lock); |
| 243 | |
| 244 | if (irqflag & UARTn_INT_RX_OVERRUN) { |
| 245 | struct tty_port *tport = &port->state->port; |
| 246 | |
| 247 | mps2_uart_write8(port, UARTn_INT_RX_OVERRUN, UARTn_INT); |
| 248 | port->icount.overrun++; |
| 249 | tty_insert_flip_char(tport, 0, TTY_OVERRUN); |
| 250 | tty_flip_buffer_push(tport); |
| 251 | handled = IRQ_HANDLED; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * It's never been seen in practice and it never *should* happen since |
| 256 | * we check if there is enough room in TX buffer before sending data. |
| 257 | * So we keep this check in case something suspicious has happened. |
| 258 | */ |
| 259 | if (irqflag & UARTn_INT_TX_OVERRUN) { |
| 260 | mps2_uart_write8(port, UARTn_INT_TX_OVERRUN, UARTn_INT); |
| 261 | handled = IRQ_HANDLED; |
| 262 | } |
| 263 | |
| 264 | spin_unlock(&port->lock); |
| 265 | |
| 266 | return handled; |
| 267 | } |
| 268 | |
| 269 | static int mps2_uart_startup(struct uart_port *port) |
| 270 | { |
| 271 | struct mps2_uart_port *mps_port = to_mps2_port(port); |
| 272 | u8 control = mps2_uart_read8(port, UARTn_CTRL); |
| 273 | int ret; |
| 274 | |
| 275 | control &= ~(UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP); |
| 276 | |
| 277 | mps2_uart_write8(port, control, UARTn_CTRL); |
| 278 | |
| 279 | ret = request_irq(mps_port->rx_irq, mps2_uart_rxirq, 0, |
| 280 | MAKE_NAME(-rx), mps_port); |
| 281 | if (ret) { |
| 282 | dev_err(port->dev, "failed to register rxirq (%d)\n", ret); |
| 283 | return ret; |
| 284 | } |
| 285 | |
| 286 | ret = request_irq(mps_port->tx_irq, mps2_uart_txirq, 0, |
| 287 | MAKE_NAME(-tx), mps_port); |
| 288 | if (ret) { |
| 289 | dev_err(port->dev, "failed to register txirq (%d)\n", ret); |
| 290 | goto err_free_rxirq; |
| 291 | } |
| 292 | |
| 293 | ret = request_irq(port->irq, mps2_uart_oerrirq, IRQF_SHARED, |
| 294 | MAKE_NAME(-overrun), mps_port); |
| 295 | |
| 296 | if (ret) { |
| 297 | dev_err(port->dev, "failed to register oerrirq (%d)\n", ret); |
| 298 | goto err_free_txirq; |
| 299 | } |
| 300 | |
| 301 | control |= UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP; |
| 302 | |
| 303 | mps2_uart_write8(port, control, UARTn_CTRL); |
| 304 | |
| 305 | return 0; |
| 306 | |
| 307 | err_free_txirq: |
| 308 | free_irq(mps_port->tx_irq, mps_port); |
| 309 | err_free_rxirq: |
| 310 | free_irq(mps_port->rx_irq, mps_port); |
| 311 | |
| 312 | return ret; |
| 313 | } |
| 314 | |
| 315 | static void mps2_uart_shutdown(struct uart_port *port) |
| 316 | { |
| 317 | struct mps2_uart_port *mps_port = to_mps2_port(port); |
| 318 | u8 control = mps2_uart_read8(port, UARTn_CTRL); |
| 319 | |
| 320 | control &= ~(UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP); |
| 321 | |
| 322 | mps2_uart_write8(port, control, UARTn_CTRL); |
| 323 | |
| 324 | free_irq(mps_port->rx_irq, mps_port); |
| 325 | free_irq(mps_port->tx_irq, mps_port); |
| 326 | free_irq(port->irq, mps_port); |
| 327 | } |
| 328 | |
| 329 | static void |
| 330 | mps2_uart_set_termios(struct uart_port *port, struct ktermios *termios, |
| 331 | struct ktermios *old) |
| 332 | { |
| 333 | unsigned long flags; |
| 334 | unsigned int baud, bauddiv; |
| 335 | |
| 336 | termios->c_cflag &= ~(CRTSCTS | CMSPAR); |
| 337 | termios->c_cflag &= ~CSIZE; |
| 338 | termios->c_cflag |= CS8; |
| 339 | termios->c_cflag &= ~PARENB; |
| 340 | termios->c_cflag &= ~CSTOPB; |
| 341 | |
| 342 | baud = uart_get_baud_rate(port, termios, old, |
| 343 | DIV_ROUND_CLOSEST(port->uartclk, UARTn_BAUDDIV_MASK), |
| 344 | DIV_ROUND_CLOSEST(port->uartclk, 16)); |
| 345 | |
| 346 | bauddiv = DIV_ROUND_CLOSEST(port->uartclk, baud); |
| 347 | |
| 348 | spin_lock_irqsave(&port->lock, flags); |
| 349 | |
| 350 | uart_update_timeout(port, termios->c_cflag, baud); |
| 351 | mps2_uart_write32(port, bauddiv, UARTn_BAUDDIV); |
| 352 | |
| 353 | spin_unlock_irqrestore(&port->lock, flags); |
| 354 | |
| 355 | if (tty_termios_baud_rate(termios)) |
| 356 | tty_termios_encode_baud_rate(termios, baud, baud); |
| 357 | } |
| 358 | |
| 359 | static const char *mps2_uart_type(struct uart_port *port) |
| 360 | { |
| 361 | return (port->type == PORT_MPS2UART) ? DRIVER_NAME : NULL; |
| 362 | } |
| 363 | |
| 364 | static void mps2_uart_release_port(struct uart_port *port) |
| 365 | { |
| 366 | } |
| 367 | |
| 368 | static int mps2_uart_request_port(struct uart_port *port) |
| 369 | { |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | static void mps2_uart_config_port(struct uart_port *port, int type) |
| 374 | { |
| 375 | if (type & UART_CONFIG_TYPE && !mps2_uart_request_port(port)) |
| 376 | port->type = PORT_MPS2UART; |
| 377 | } |
| 378 | |
| 379 | static int mps2_uart_verify_port(struct uart_port *port, struct serial_struct *serinfo) |
| 380 | { |
| 381 | return -EINVAL; |
| 382 | } |
| 383 | |
| 384 | static const struct uart_ops mps2_uart_pops = { |
| 385 | .tx_empty = mps2_uart_tx_empty, |
| 386 | .set_mctrl = mps2_uart_set_mctrl, |
| 387 | .get_mctrl = mps2_uart_get_mctrl, |
| 388 | .stop_tx = mps2_uart_stop_tx, |
| 389 | .start_tx = mps2_uart_start_tx, |
| 390 | .stop_rx = mps2_uart_stop_rx, |
| 391 | .break_ctl = mps2_uart_break_ctl, |
| 392 | .startup = mps2_uart_startup, |
| 393 | .shutdown = mps2_uart_shutdown, |
| 394 | .set_termios = mps2_uart_set_termios, |
| 395 | .type = mps2_uart_type, |
| 396 | .release_port = mps2_uart_release_port, |
| 397 | .request_port = mps2_uart_request_port, |
| 398 | .config_port = mps2_uart_config_port, |
| 399 | .verify_port = mps2_uart_verify_port, |
| 400 | }; |
| 401 | |
| 402 | static struct mps2_uart_port mps2_uart_ports[MPS2_MAX_PORTS]; |
| 403 | |
| 404 | #ifdef CONFIG_SERIAL_MPS2_UART_CONSOLE |
| 405 | static void mps2_uart_console_putchar(struct uart_port *port, int ch) |
| 406 | { |
| 407 | while (mps2_uart_read8(port, UARTn_STATE) & UARTn_STATE_TX_FULL) |
| 408 | cpu_relax(); |
| 409 | |
| 410 | mps2_uart_write8(port, ch, UARTn_DATA); |
| 411 | } |
| 412 | |
| 413 | static void mps2_uart_console_write(struct console *co, const char *s, unsigned int cnt) |
| 414 | { |
| 415 | struct uart_port *port = &mps2_uart_ports[co->index].port; |
| 416 | |
| 417 | uart_console_write(port, s, cnt, mps2_uart_console_putchar); |
| 418 | } |
| 419 | |
| 420 | static int mps2_uart_console_setup(struct console *co, char *options) |
| 421 | { |
| 422 | struct mps2_uart_port *mps_port; |
| 423 | int baud = 9600; |
| 424 | int bits = 8; |
| 425 | int parity = 'n'; |
| 426 | int flow = 'n'; |
| 427 | |
| 428 | if (co->index < 0 || co->index >= MPS2_MAX_PORTS) |
| 429 | return -ENODEV; |
| 430 | |
| 431 | mps_port = &mps2_uart_ports[co->index]; |
| 432 | |
| 433 | if (options) |
| 434 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 435 | |
| 436 | return uart_set_options(&mps_port->port, co, baud, parity, bits, flow); |
| 437 | } |
| 438 | |
| 439 | static struct uart_driver mps2_uart_driver; |
| 440 | |
| 441 | static struct console mps2_uart_console = { |
| 442 | .name = SERIAL_NAME, |
| 443 | .device = uart_console_device, |
| 444 | .write = mps2_uart_console_write, |
| 445 | .setup = mps2_uart_console_setup, |
| 446 | .flags = CON_PRINTBUFFER, |
| 447 | .index = -1, |
| 448 | .data = &mps2_uart_driver, |
| 449 | }; |
| 450 | |
| 451 | #define MPS2_SERIAL_CONSOLE (&mps2_uart_console) |
| 452 | |
Vladimir Murzin | bd8d257 | 2016-04-25 09:47:48 +0100 | [diff] [blame] | 453 | static void mps2_early_putchar(struct uart_port *port, int ch) |
| 454 | { |
| 455 | while (readb(port->membase + UARTn_STATE) & UARTn_STATE_TX_FULL) |
| 456 | cpu_relax(); |
| 457 | |
| 458 | writeb((unsigned char)ch, port->membase + UARTn_DATA); |
| 459 | } |
| 460 | |
| 461 | static void mps2_early_write(struct console *con, const char *s, unsigned int n) |
| 462 | { |
| 463 | struct earlycon_device *dev = con->data; |
| 464 | |
| 465 | uart_console_write(&dev->port, s, n, mps2_early_putchar); |
| 466 | } |
| 467 | |
| 468 | static int __init mps2_early_console_setup(struct earlycon_device *device, |
| 469 | const char *opt) |
| 470 | { |
| 471 | if (!device->port.membase) |
| 472 | return -ENODEV; |
| 473 | |
| 474 | device->con->write = mps2_early_write; |
| 475 | |
| 476 | return 0; |
| 477 | } |
| 478 | |
| 479 | OF_EARLYCON_DECLARE(mps2, "arm,mps2-uart", mps2_early_console_setup); |
| 480 | |
Vladimir Murzin | 041f031 | 2016-04-25 09:47:47 +0100 | [diff] [blame] | 481 | #else |
| 482 | #define MPS2_SERIAL_CONSOLE NULL |
| 483 | #endif |
| 484 | |
| 485 | static struct uart_driver mps2_uart_driver = { |
| 486 | .driver_name = DRIVER_NAME, |
| 487 | .dev_name = SERIAL_NAME, |
| 488 | .nr = MPS2_MAX_PORTS, |
| 489 | .cons = MPS2_SERIAL_CONSOLE, |
| 490 | }; |
| 491 | |
| 492 | static struct mps2_uart_port *mps2_of_get_port(struct platform_device *pdev) |
| 493 | { |
| 494 | struct device_node *np = pdev->dev.of_node; |
| 495 | int id; |
| 496 | |
| 497 | if (!np) |
| 498 | return NULL; |
| 499 | |
| 500 | id = of_alias_get_id(np, "serial"); |
| 501 | if (id < 0) |
| 502 | id = 0; |
| 503 | |
| 504 | if (WARN_ON(id >= MPS2_MAX_PORTS)) |
| 505 | return NULL; |
| 506 | |
| 507 | mps2_uart_ports[id].port.line = id; |
| 508 | return &mps2_uart_ports[id]; |
| 509 | } |
| 510 | |
| 511 | static int mps2_init_port(struct mps2_uart_port *mps_port, |
| 512 | struct platform_device *pdev) |
| 513 | { |
| 514 | struct resource *res; |
| 515 | int ret; |
| 516 | |
| 517 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 518 | mps_port->port.membase = devm_ioremap_resource(&pdev->dev, res); |
| 519 | if (IS_ERR(mps_port->port.membase)) |
| 520 | return PTR_ERR(mps_port->port.membase); |
| 521 | |
| 522 | mps_port->port.mapbase = res->start; |
| 523 | mps_port->port.mapsize = resource_size(res); |
| 524 | |
| 525 | mps_port->rx_irq = platform_get_irq(pdev, 0); |
| 526 | mps_port->tx_irq = platform_get_irq(pdev, 1); |
| 527 | mps_port->port.irq = platform_get_irq(pdev, 2); |
| 528 | |
| 529 | mps_port->port.iotype = UPIO_MEM; |
| 530 | mps_port->port.flags = UPF_BOOT_AUTOCONF; |
| 531 | mps_port->port.fifosize = 1; |
| 532 | mps_port->port.ops = &mps2_uart_pops; |
| 533 | mps_port->port.dev = &pdev->dev; |
| 534 | |
| 535 | mps_port->clk = devm_clk_get(&pdev->dev, NULL); |
| 536 | if (IS_ERR(mps_port->clk)) |
| 537 | return PTR_ERR(mps_port->clk); |
| 538 | |
| 539 | ret = clk_prepare_enable(mps_port->clk); |
| 540 | if (ret) |
| 541 | return ret; |
| 542 | |
| 543 | mps_port->port.uartclk = clk_get_rate(mps_port->clk); |
| 544 | |
| 545 | clk_disable_unprepare(mps_port->clk); |
| 546 | |
| 547 | return ret; |
| 548 | } |
| 549 | |
| 550 | static int mps2_serial_probe(struct platform_device *pdev) |
| 551 | { |
| 552 | struct mps2_uart_port *mps_port; |
| 553 | int ret; |
| 554 | |
| 555 | mps_port = mps2_of_get_port(pdev); |
| 556 | if (!mps_port) |
| 557 | return -ENODEV; |
| 558 | |
| 559 | ret = mps2_init_port(mps_port, pdev); |
| 560 | if (ret) |
| 561 | return ret; |
| 562 | |
| 563 | ret = uart_add_one_port(&mps2_uart_driver, &mps_port->port); |
| 564 | if (ret) |
| 565 | return ret; |
| 566 | |
| 567 | platform_set_drvdata(pdev, mps_port); |
| 568 | |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | static int mps2_serial_remove(struct platform_device *pdev) |
| 573 | { |
| 574 | struct mps2_uart_port *mps_port = platform_get_drvdata(pdev); |
| 575 | |
| 576 | uart_remove_one_port(&mps2_uart_driver, &mps_port->port); |
| 577 | |
| 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | #ifdef CONFIG_OF |
| 582 | static const struct of_device_id mps2_match[] = { |
| 583 | { .compatible = "arm,mps2-uart", }, |
| 584 | {}, |
| 585 | }; |
| 586 | MODULE_DEVICE_TABLE(of, mps2_match); |
| 587 | #endif |
| 588 | |
| 589 | static struct platform_driver mps2_serial_driver = { |
| 590 | .probe = mps2_serial_probe, |
| 591 | .remove = mps2_serial_remove, |
| 592 | |
| 593 | .driver = { |
| 594 | .name = DRIVER_NAME, |
| 595 | .of_match_table = of_match_ptr(mps2_match), |
| 596 | }, |
| 597 | }; |
| 598 | |
| 599 | static int __init mps2_uart_init(void) |
| 600 | { |
| 601 | int ret; |
| 602 | |
| 603 | ret = uart_register_driver(&mps2_uart_driver); |
| 604 | if (ret) |
| 605 | return ret; |
| 606 | |
| 607 | ret = platform_driver_register(&mps2_serial_driver); |
| 608 | if (ret) |
| 609 | uart_unregister_driver(&mps2_uart_driver); |
| 610 | |
| 611 | return ret; |
| 612 | } |
| 613 | module_init(mps2_uart_init); |
| 614 | |
| 615 | static void __exit mps2_uart_exit(void) |
| 616 | { |
| 617 | platform_driver_unregister(&mps2_serial_driver); |
| 618 | uart_unregister_driver(&mps2_uart_driver); |
| 619 | } |
| 620 | module_exit(mps2_uart_exit); |
| 621 | |
| 622 | MODULE_AUTHOR("Vladimir Murzin <vladimir.murzin@arm.com>"); |
| 623 | MODULE_DESCRIPTION("MPS2 UART driver"); |
| 624 | MODULE_LICENSE("GPL v2"); |
| 625 | MODULE_ALIAS("platform:" DRIVER_NAME); |