Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 1 | /* |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 2 | * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com> |
| 3 | * |
| 4 | * Based on msm_serial.c, which is: |
| 5 | * Copyright (C) 2007 Google, Inc. |
| 6 | * Author: Robert Love <rlove@google.com> |
| 7 | * |
| 8 | * This software is licensed under the terms of the GNU General Public |
| 9 | * License version 2, as published by the Free Software Foundation, and |
| 10 | * may be copied, distributed, and modified under those terms. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | */ |
| 17 | |
| 18 | #if defined(CONFIG_SERIAL_VT8500_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 19 | # define SUPPORT_SYSRQ |
| 20 | #endif |
| 21 | |
| 22 | #include <linux/hrtimer.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/io.h> |
| 26 | #include <linux/ioport.h> |
| 27 | #include <linux/irq.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/console.h> |
| 30 | #include <linux/tty.h> |
| 31 | #include <linux/tty_flip.h> |
| 32 | #include <linux/serial_core.h> |
| 33 | #include <linux/serial.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/clk.h> |
| 36 | #include <linux/platform_device.h> |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 37 | #include <linux/of.h> |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 38 | |
| 39 | /* |
| 40 | * UART Register offsets |
| 41 | */ |
| 42 | |
| 43 | #define VT8500_URTDR 0x0000 /* Transmit data */ |
| 44 | #define VT8500_URRDR 0x0004 /* Receive data */ |
| 45 | #define VT8500_URDIV 0x0008 /* Clock/Baud rate divisor */ |
| 46 | #define VT8500_URLCR 0x000C /* Line control */ |
| 47 | #define VT8500_URICR 0x0010 /* IrDA control */ |
| 48 | #define VT8500_URIER 0x0014 /* Interrupt enable */ |
| 49 | #define VT8500_URISR 0x0018 /* Interrupt status */ |
| 50 | #define VT8500_URUSR 0x001c /* UART status */ |
| 51 | #define VT8500_URFCR 0x0020 /* FIFO control */ |
| 52 | #define VT8500_URFIDX 0x0024 /* FIFO index */ |
| 53 | #define VT8500_URBKR 0x0028 /* Break signal count */ |
| 54 | #define VT8500_URTOD 0x002c /* Time out divisor */ |
| 55 | #define VT8500_TXFIFO 0x1000 /* Transmit FIFO (16x8) */ |
| 56 | #define VT8500_RXFIFO 0x1020 /* Receive FIFO (16x10) */ |
| 57 | |
| 58 | /* |
| 59 | * Interrupt enable and status bits |
| 60 | */ |
| 61 | |
| 62 | #define TXDE (1 << 0) /* Tx Data empty */ |
| 63 | #define RXDF (1 << 1) /* Rx Data full */ |
| 64 | #define TXFAE (1 << 2) /* Tx FIFO almost empty */ |
| 65 | #define TXFE (1 << 3) /* Tx FIFO empty */ |
| 66 | #define RXFAF (1 << 4) /* Rx FIFO almost full */ |
| 67 | #define RXFF (1 << 5) /* Rx FIFO full */ |
| 68 | #define TXUDR (1 << 6) /* Tx underrun */ |
| 69 | #define RXOVER (1 << 7) /* Rx overrun */ |
| 70 | #define PER (1 << 8) /* Parity error */ |
| 71 | #define FER (1 << 9) /* Frame error */ |
| 72 | #define TCTS (1 << 10) /* Toggle of CTS */ |
| 73 | #define RXTOUT (1 << 11) /* Rx timeout */ |
| 74 | #define BKDONE (1 << 12) /* Break signal done */ |
| 75 | #define ERR (1 << 13) /* AHB error response */ |
| 76 | |
| 77 | #define RX_FIFO_INTS (RXFAF | RXFF | RXOVER | PER | FER | RXTOUT) |
| 78 | #define TX_FIFO_INTS (TXFAE | TXFE | TXUDR) |
| 79 | |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 80 | #define VT8500_MAX_PORTS 6 |
| 81 | |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 82 | struct vt8500_port { |
| 83 | struct uart_port uart; |
| 84 | char name[16]; |
| 85 | struct clk *clk; |
| 86 | unsigned int ier; |
| 87 | }; |
| 88 | |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 89 | /* |
| 90 | * we use this variable to keep track of which ports |
| 91 | * have been allocated as we can't use pdev->id in |
| 92 | * devicetree |
| 93 | */ |
| 94 | static unsigned long vt8500_ports_in_use; |
| 95 | |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 96 | static inline void vt8500_write(struct uart_port *port, unsigned int val, |
| 97 | unsigned int off) |
| 98 | { |
| 99 | writel(val, port->membase + off); |
| 100 | } |
| 101 | |
| 102 | static inline unsigned int vt8500_read(struct uart_port *port, unsigned int off) |
| 103 | { |
| 104 | return readl(port->membase + off); |
| 105 | } |
| 106 | |
| 107 | static void vt8500_stop_tx(struct uart_port *port) |
| 108 | { |
| 109 | struct vt8500_port *vt8500_port = container_of(port, |
| 110 | struct vt8500_port, |
| 111 | uart); |
| 112 | |
| 113 | vt8500_port->ier &= ~TX_FIFO_INTS; |
| 114 | vt8500_write(port, vt8500_port->ier, VT8500_URIER); |
| 115 | } |
| 116 | |
| 117 | static void vt8500_stop_rx(struct uart_port *port) |
| 118 | { |
| 119 | struct vt8500_port *vt8500_port = container_of(port, |
| 120 | struct vt8500_port, |
| 121 | uart); |
| 122 | |
| 123 | vt8500_port->ier &= ~RX_FIFO_INTS; |
| 124 | vt8500_write(port, vt8500_port->ier, VT8500_URIER); |
| 125 | } |
| 126 | |
| 127 | static void vt8500_enable_ms(struct uart_port *port) |
| 128 | { |
| 129 | struct vt8500_port *vt8500_port = container_of(port, |
| 130 | struct vt8500_port, |
| 131 | uart); |
| 132 | |
| 133 | vt8500_port->ier |= TCTS; |
| 134 | vt8500_write(port, vt8500_port->ier, VT8500_URIER); |
| 135 | } |
| 136 | |
| 137 | static void handle_rx(struct uart_port *port) |
| 138 | { |
| 139 | struct tty_struct *tty = tty_port_tty_get(&port->state->port); |
| 140 | if (!tty) { |
| 141 | /* Discard data: no tty available */ |
| 142 | int count = (vt8500_read(port, VT8500_URFIDX) & 0x1f00) >> 8; |
| 143 | u16 ch; |
| 144 | while (count--) |
| 145 | ch = readw(port->membase + VT8500_RXFIFO); |
| 146 | return; |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * Handle overrun |
| 151 | */ |
| 152 | if ((vt8500_read(port, VT8500_URISR) & RXOVER)) { |
| 153 | port->icount.overrun++; |
| 154 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
| 155 | } |
| 156 | |
| 157 | /* and now the main RX loop */ |
| 158 | while (vt8500_read(port, VT8500_URFIDX) & 0x1f00) { |
| 159 | unsigned int c; |
| 160 | char flag = TTY_NORMAL; |
| 161 | |
| 162 | c = readw(port->membase + VT8500_RXFIFO) & 0x3ff; |
| 163 | |
| 164 | /* Mask conditions we're ignorning. */ |
| 165 | c &= ~port->read_status_mask; |
| 166 | |
| 167 | if (c & FER) { |
| 168 | port->icount.frame++; |
| 169 | flag = TTY_FRAME; |
| 170 | } else if (c & PER) { |
| 171 | port->icount.parity++; |
| 172 | flag = TTY_PARITY; |
| 173 | } |
| 174 | port->icount.rx++; |
| 175 | |
| 176 | if (!uart_handle_sysrq_char(port, c)) |
| 177 | tty_insert_flip_char(tty, c, flag); |
| 178 | } |
| 179 | |
| 180 | tty_flip_buffer_push(tty); |
| 181 | tty_kref_put(tty); |
| 182 | } |
| 183 | |
| 184 | static void handle_tx(struct uart_port *port) |
| 185 | { |
| 186 | struct circ_buf *xmit = &port->state->xmit; |
| 187 | |
| 188 | if (port->x_char) { |
| 189 | writeb(port->x_char, port->membase + VT8500_TXFIFO); |
| 190 | port->icount.tx++; |
| 191 | port->x_char = 0; |
| 192 | } |
| 193 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { |
| 194 | vt8500_stop_tx(port); |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | while ((vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16) { |
| 199 | if (uart_circ_empty(xmit)) |
| 200 | break; |
| 201 | |
| 202 | writeb(xmit->buf[xmit->tail], port->membase + VT8500_TXFIFO); |
| 203 | |
| 204 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 205 | port->icount.tx++; |
| 206 | } |
| 207 | |
| 208 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 209 | uart_write_wakeup(port); |
| 210 | |
| 211 | if (uart_circ_empty(xmit)) |
| 212 | vt8500_stop_tx(port); |
| 213 | } |
| 214 | |
| 215 | static void vt8500_start_tx(struct uart_port *port) |
| 216 | { |
| 217 | struct vt8500_port *vt8500_port = container_of(port, |
| 218 | struct vt8500_port, |
| 219 | uart); |
| 220 | |
| 221 | vt8500_port->ier &= ~TX_FIFO_INTS; |
| 222 | vt8500_write(port, vt8500_port->ier, VT8500_URIER); |
| 223 | handle_tx(port); |
| 224 | vt8500_port->ier |= TX_FIFO_INTS; |
| 225 | vt8500_write(port, vt8500_port->ier, VT8500_URIER); |
| 226 | } |
| 227 | |
| 228 | static void handle_delta_cts(struct uart_port *port) |
| 229 | { |
| 230 | port->icount.cts++; |
| 231 | wake_up_interruptible(&port->state->port.delta_msr_wait); |
| 232 | } |
| 233 | |
| 234 | static irqreturn_t vt8500_irq(int irq, void *dev_id) |
| 235 | { |
| 236 | struct uart_port *port = dev_id; |
| 237 | unsigned long isr; |
| 238 | |
| 239 | spin_lock(&port->lock); |
| 240 | isr = vt8500_read(port, VT8500_URISR); |
| 241 | |
| 242 | /* Acknowledge active status bits */ |
| 243 | vt8500_write(port, isr, VT8500_URISR); |
| 244 | |
| 245 | if (isr & RX_FIFO_INTS) |
| 246 | handle_rx(port); |
| 247 | if (isr & TX_FIFO_INTS) |
| 248 | handle_tx(port); |
| 249 | if (isr & TCTS) |
| 250 | handle_delta_cts(port); |
| 251 | |
| 252 | spin_unlock(&port->lock); |
| 253 | |
| 254 | return IRQ_HANDLED; |
| 255 | } |
| 256 | |
| 257 | static unsigned int vt8500_tx_empty(struct uart_port *port) |
| 258 | { |
| 259 | return (vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16 ? |
| 260 | TIOCSER_TEMT : 0; |
| 261 | } |
| 262 | |
| 263 | static unsigned int vt8500_get_mctrl(struct uart_port *port) |
| 264 | { |
| 265 | unsigned int usr; |
| 266 | |
| 267 | usr = vt8500_read(port, VT8500_URUSR); |
| 268 | if (usr & (1 << 4)) |
| 269 | return TIOCM_CTS; |
| 270 | else |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | static void vt8500_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 275 | { |
| 276 | } |
| 277 | |
| 278 | static void vt8500_break_ctl(struct uart_port *port, int break_ctl) |
| 279 | { |
| 280 | if (break_ctl) |
| 281 | vt8500_write(port, vt8500_read(port, VT8500_URLCR) | (1 << 9), |
| 282 | VT8500_URLCR); |
| 283 | } |
| 284 | |
| 285 | static int vt8500_set_baud_rate(struct uart_port *port, unsigned int baud) |
| 286 | { |
| 287 | unsigned long div; |
| 288 | unsigned int loops = 1000; |
| 289 | |
| 290 | div = vt8500_read(port, VT8500_URDIV) & ~(0x3ff); |
| 291 | |
| 292 | if (unlikely((baud < 900) || (baud > 921600))) |
| 293 | div |= 7; |
| 294 | else |
| 295 | div |= (921600 / baud) - 1; |
| 296 | |
| 297 | while ((vt8500_read(port, VT8500_URUSR) & (1 << 5)) && --loops) |
| 298 | cpu_relax(); |
| 299 | vt8500_write(port, div, VT8500_URDIV); |
| 300 | |
| 301 | return baud; |
| 302 | } |
| 303 | |
| 304 | static int vt8500_startup(struct uart_port *port) |
| 305 | { |
| 306 | struct vt8500_port *vt8500_port = |
| 307 | container_of(port, struct vt8500_port, uart); |
| 308 | int ret; |
| 309 | |
| 310 | snprintf(vt8500_port->name, sizeof(vt8500_port->name), |
| 311 | "vt8500_serial%d", port->line); |
| 312 | |
| 313 | ret = request_irq(port->irq, vt8500_irq, IRQF_TRIGGER_HIGH, |
| 314 | vt8500_port->name, port); |
| 315 | if (unlikely(ret)) |
| 316 | return ret; |
| 317 | |
| 318 | vt8500_write(port, 0x03, VT8500_URLCR); /* enable TX & RX */ |
| 319 | |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static void vt8500_shutdown(struct uart_port *port) |
| 324 | { |
| 325 | struct vt8500_port *vt8500_port = |
| 326 | container_of(port, struct vt8500_port, uart); |
| 327 | |
| 328 | vt8500_port->ier = 0; |
| 329 | |
| 330 | /* disable interrupts and FIFOs */ |
| 331 | vt8500_write(&vt8500_port->uart, 0, VT8500_URIER); |
| 332 | vt8500_write(&vt8500_port->uart, 0x880, VT8500_URFCR); |
| 333 | free_irq(port->irq, port); |
| 334 | } |
| 335 | |
| 336 | static void vt8500_set_termios(struct uart_port *port, |
| 337 | struct ktermios *termios, |
| 338 | struct ktermios *old) |
| 339 | { |
| 340 | struct vt8500_port *vt8500_port = |
| 341 | container_of(port, struct vt8500_port, uart); |
| 342 | unsigned long flags; |
| 343 | unsigned int baud, lcr; |
| 344 | unsigned int loops = 1000; |
| 345 | |
| 346 | spin_lock_irqsave(&port->lock, flags); |
| 347 | |
| 348 | /* calculate and set baud rate */ |
| 349 | baud = uart_get_baud_rate(port, termios, old, 900, 921600); |
| 350 | baud = vt8500_set_baud_rate(port, baud); |
| 351 | if (tty_termios_baud_rate(termios)) |
| 352 | tty_termios_encode_baud_rate(termios, baud, baud); |
| 353 | |
| 354 | /* calculate parity */ |
| 355 | lcr = vt8500_read(&vt8500_port->uart, VT8500_URLCR); |
| 356 | lcr &= ~((1 << 5) | (1 << 4)); |
| 357 | if (termios->c_cflag & PARENB) { |
| 358 | lcr |= (1 << 4); |
| 359 | termios->c_cflag &= ~CMSPAR; |
| 360 | if (termios->c_cflag & PARODD) |
| 361 | lcr |= (1 << 5); |
| 362 | } |
| 363 | |
| 364 | /* calculate bits per char */ |
| 365 | lcr &= ~(1 << 2); |
| 366 | switch (termios->c_cflag & CSIZE) { |
| 367 | case CS7: |
| 368 | break; |
| 369 | case CS8: |
| 370 | default: |
| 371 | lcr |= (1 << 2); |
| 372 | termios->c_cflag &= ~CSIZE; |
| 373 | termios->c_cflag |= CS8; |
| 374 | break; |
| 375 | } |
| 376 | |
| 377 | /* calculate stop bits */ |
| 378 | lcr &= ~(1 << 3); |
| 379 | if (termios->c_cflag & CSTOPB) |
| 380 | lcr |= (1 << 3); |
| 381 | |
| 382 | /* set parity, bits per char, and stop bit */ |
| 383 | vt8500_write(&vt8500_port->uart, lcr, VT8500_URLCR); |
| 384 | |
| 385 | /* Configure status bits to ignore based on termio flags. */ |
| 386 | port->read_status_mask = 0; |
| 387 | if (termios->c_iflag & IGNPAR) |
| 388 | port->read_status_mask = FER | PER; |
| 389 | |
| 390 | uart_update_timeout(port, termios->c_cflag, baud); |
| 391 | |
| 392 | /* Reset FIFOs */ |
| 393 | vt8500_write(&vt8500_port->uart, 0x88c, VT8500_URFCR); |
| 394 | while ((vt8500_read(&vt8500_port->uart, VT8500_URFCR) & 0xc) |
| 395 | && --loops) |
| 396 | cpu_relax(); |
| 397 | |
| 398 | /* Every possible FIFO-related interrupt */ |
| 399 | vt8500_port->ier = RX_FIFO_INTS | TX_FIFO_INTS; |
| 400 | |
| 401 | /* |
| 402 | * CTS flow control |
| 403 | */ |
| 404 | if (UART_ENABLE_MS(&vt8500_port->uart, termios->c_cflag)) |
| 405 | vt8500_port->ier |= TCTS; |
| 406 | |
| 407 | vt8500_write(&vt8500_port->uart, 0x881, VT8500_URFCR); |
| 408 | vt8500_write(&vt8500_port->uart, vt8500_port->ier, VT8500_URIER); |
| 409 | |
| 410 | spin_unlock_irqrestore(&port->lock, flags); |
| 411 | } |
| 412 | |
| 413 | static const char *vt8500_type(struct uart_port *port) |
| 414 | { |
| 415 | struct vt8500_port *vt8500_port = |
| 416 | container_of(port, struct vt8500_port, uart); |
| 417 | return vt8500_port->name; |
| 418 | } |
| 419 | |
| 420 | static void vt8500_release_port(struct uart_port *port) |
| 421 | { |
| 422 | } |
| 423 | |
| 424 | static int vt8500_request_port(struct uart_port *port) |
| 425 | { |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | static void vt8500_config_port(struct uart_port *port, int flags) |
| 430 | { |
| 431 | port->type = PORT_VT8500; |
| 432 | } |
| 433 | |
| 434 | static int vt8500_verify_port(struct uart_port *port, |
| 435 | struct serial_struct *ser) |
| 436 | { |
| 437 | if (unlikely(ser->type != PORT_UNKNOWN && ser->type != PORT_VT8500)) |
| 438 | return -EINVAL; |
| 439 | if (unlikely(port->irq != ser->irq)) |
| 440 | return -EINVAL; |
| 441 | return 0; |
| 442 | } |
| 443 | |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 444 | static struct vt8500_port *vt8500_uart_ports[VT8500_MAX_PORTS]; |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 445 | static struct uart_driver vt8500_uart_driver; |
| 446 | |
| 447 | #ifdef CONFIG_SERIAL_VT8500_CONSOLE |
| 448 | |
| 449 | static inline void wait_for_xmitr(struct uart_port *port) |
| 450 | { |
| 451 | unsigned int status, tmout = 10000; |
| 452 | |
| 453 | /* Wait up to 10ms for the character(s) to be sent. */ |
| 454 | do { |
| 455 | status = vt8500_read(port, VT8500_URFIDX); |
| 456 | |
| 457 | if (--tmout == 0) |
| 458 | break; |
| 459 | udelay(1); |
| 460 | } while (status & 0x10); |
| 461 | } |
| 462 | |
| 463 | static void vt8500_console_putchar(struct uart_port *port, int c) |
| 464 | { |
| 465 | wait_for_xmitr(port); |
| 466 | writeb(c, port->membase + VT8500_TXFIFO); |
| 467 | } |
| 468 | |
| 469 | static void vt8500_console_write(struct console *co, const char *s, |
| 470 | unsigned int count) |
| 471 | { |
| 472 | struct vt8500_port *vt8500_port = vt8500_uart_ports[co->index]; |
| 473 | unsigned long ier; |
| 474 | |
| 475 | BUG_ON(co->index < 0 || co->index >= vt8500_uart_driver.nr); |
| 476 | |
| 477 | ier = vt8500_read(&vt8500_port->uart, VT8500_URIER); |
| 478 | vt8500_write(&vt8500_port->uart, VT8500_URIER, 0); |
| 479 | |
| 480 | uart_console_write(&vt8500_port->uart, s, count, |
| 481 | vt8500_console_putchar); |
| 482 | |
| 483 | /* |
| 484 | * Finally, wait for transmitter to become empty |
| 485 | * and switch back to FIFO |
| 486 | */ |
| 487 | wait_for_xmitr(&vt8500_port->uart); |
| 488 | vt8500_write(&vt8500_port->uart, VT8500_URIER, ier); |
| 489 | } |
| 490 | |
| 491 | static int __init vt8500_console_setup(struct console *co, char *options) |
| 492 | { |
| 493 | struct vt8500_port *vt8500_port; |
| 494 | int baud = 9600; |
| 495 | int bits = 8; |
| 496 | int parity = 'n'; |
| 497 | int flow = 'n'; |
| 498 | |
| 499 | if (unlikely(co->index >= vt8500_uart_driver.nr || co->index < 0)) |
| 500 | return -ENXIO; |
| 501 | |
| 502 | vt8500_port = vt8500_uart_ports[co->index]; |
| 503 | |
| 504 | if (!vt8500_port) |
| 505 | return -ENODEV; |
| 506 | |
| 507 | if (options) |
| 508 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 509 | |
| 510 | return uart_set_options(&vt8500_port->uart, |
| 511 | co, baud, parity, bits, flow); |
| 512 | } |
| 513 | |
| 514 | static struct console vt8500_console = { |
| 515 | .name = "ttyWMT", |
| 516 | .write = vt8500_console_write, |
| 517 | .device = uart_console_device, |
| 518 | .setup = vt8500_console_setup, |
| 519 | .flags = CON_PRINTBUFFER, |
| 520 | .index = -1, |
| 521 | .data = &vt8500_uart_driver, |
| 522 | }; |
| 523 | |
| 524 | #define VT8500_CONSOLE (&vt8500_console) |
| 525 | |
| 526 | #else |
| 527 | #define VT8500_CONSOLE NULL |
| 528 | #endif |
| 529 | |
| 530 | static struct uart_ops vt8500_uart_pops = { |
| 531 | .tx_empty = vt8500_tx_empty, |
| 532 | .set_mctrl = vt8500_set_mctrl, |
| 533 | .get_mctrl = vt8500_get_mctrl, |
| 534 | .stop_tx = vt8500_stop_tx, |
| 535 | .start_tx = vt8500_start_tx, |
| 536 | .stop_rx = vt8500_stop_rx, |
| 537 | .enable_ms = vt8500_enable_ms, |
| 538 | .break_ctl = vt8500_break_ctl, |
| 539 | .startup = vt8500_startup, |
| 540 | .shutdown = vt8500_shutdown, |
| 541 | .set_termios = vt8500_set_termios, |
| 542 | .type = vt8500_type, |
| 543 | .release_port = vt8500_release_port, |
| 544 | .request_port = vt8500_request_port, |
| 545 | .config_port = vt8500_config_port, |
| 546 | .verify_port = vt8500_verify_port, |
| 547 | }; |
| 548 | |
| 549 | static struct uart_driver vt8500_uart_driver = { |
| 550 | .owner = THIS_MODULE, |
| 551 | .driver_name = "vt8500_serial", |
| 552 | .dev_name = "ttyWMT", |
| 553 | .nr = 6, |
| 554 | .cons = VT8500_CONSOLE, |
| 555 | }; |
| 556 | |
Wolfram Sang | 9abac85 | 2012-03-11 15:02:38 +0100 | [diff] [blame] | 557 | static int __devinit vt8500_serial_probe(struct platform_device *pdev) |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 558 | { |
| 559 | struct vt8500_port *vt8500_port; |
| 560 | struct resource *mmres, *irqres; |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 561 | struct device_node *np = pdev->dev.of_node; |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 562 | int ret; |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 563 | int port; |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 564 | |
| 565 | mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 566 | irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| 567 | if (!mmres || !irqres) |
| 568 | return -ENODEV; |
| 569 | |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 570 | if (np) |
| 571 | port = of_alias_get_id(np, "serial"); |
| 572 | if (port > VT8500_MAX_PORTS) |
| 573 | port = -1; |
| 574 | else |
| 575 | port = -1; |
| 576 | |
| 577 | if (port < 0) { |
| 578 | /* calculate the port id */ |
| 579 | port = find_first_zero_bit(&vt8500_ports_in_use, |
| 580 | sizeof(vt8500_ports_in_use)); |
| 581 | } |
| 582 | |
| 583 | if (port > VT8500_MAX_PORTS) |
| 584 | return -ENODEV; |
| 585 | |
| 586 | /* reserve the port id */ |
| 587 | if (test_and_set_bit(port, &vt8500_ports_in_use)) { |
| 588 | /* port already in use - shouldn't really happen */ |
| 589 | return -EBUSY; |
| 590 | } |
| 591 | |
Wei Yongjun | 59c2e85 | 2012-10-08 10:35:46 +0800 | [diff] [blame] | 592 | vt8500_port = kzalloc(sizeof(struct vt8500_port), GFP_KERNEL); |
| 593 | if (!vt8500_port) |
| 594 | return -ENOMEM; |
| 595 | |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 596 | vt8500_port->uart.type = PORT_VT8500; |
| 597 | vt8500_port->uart.iotype = UPIO_MEM; |
| 598 | vt8500_port->uart.mapbase = mmres->start; |
| 599 | vt8500_port->uart.irq = irqres->start; |
| 600 | vt8500_port->uart.fifosize = 16; |
| 601 | vt8500_port->uart.ops = &vt8500_uart_pops; |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 602 | vt8500_port->uart.line = port; |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 603 | vt8500_port->uart.dev = &pdev->dev; |
| 604 | vt8500_port->uart.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 605 | |
| 606 | vt8500_port->clk = of_clk_get(pdev->dev.of_node, 0); |
| 607 | if (vt8500_port->clk) { |
| 608 | vt8500_port->uart.uartclk = clk_get_rate(vt8500_port->clk); |
| 609 | } else { |
| 610 | /* use the default of 24Mhz if not specified and warn */ |
| 611 | pr_warn("%s: serial clock source not specified\n", __func__); |
| 612 | vt8500_port->uart.uartclk = 24000000; |
| 613 | } |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 614 | |
| 615 | snprintf(vt8500_port->name, sizeof(vt8500_port->name), |
| 616 | "VT8500 UART%d", pdev->id); |
| 617 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 618 | vt8500_port->uart.membase = ioremap(mmres->start, resource_size(mmres)); |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 619 | if (!vt8500_port->uart.membase) { |
| 620 | ret = -ENOMEM; |
| 621 | goto err; |
| 622 | } |
| 623 | |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 624 | vt8500_uart_ports[port] = vt8500_port; |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 625 | |
| 626 | uart_add_one_port(&vt8500_uart_driver, &vt8500_port->uart); |
| 627 | |
| 628 | platform_set_drvdata(pdev, vt8500_port); |
| 629 | |
| 630 | return 0; |
| 631 | |
| 632 | err: |
| 633 | kfree(vt8500_port); |
| 634 | return ret; |
| 635 | } |
| 636 | |
| 637 | static int __devexit vt8500_serial_remove(struct platform_device *pdev) |
| 638 | { |
| 639 | struct vt8500_port *vt8500_port = platform_get_drvdata(pdev); |
| 640 | |
| 641 | platform_set_drvdata(pdev, NULL); |
| 642 | uart_remove_one_port(&vt8500_uart_driver, &vt8500_port->uart); |
| 643 | kfree(vt8500_port); |
| 644 | |
| 645 | return 0; |
| 646 | } |
| 647 | |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 648 | static const struct of_device_id wmt_dt_ids[] = { |
| 649 | { .compatible = "via,vt8500-uart", }, |
| 650 | {} |
| 651 | }; |
| 652 | |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 653 | static struct platform_driver vt8500_platform_driver = { |
| 654 | .probe = vt8500_serial_probe, |
Wolfram Sang | 9abac85 | 2012-03-11 15:02:38 +0100 | [diff] [blame] | 655 | .remove = __devexit_p(vt8500_serial_remove), |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 656 | .driver = { |
| 657 | .name = "vt8500_serial", |
| 658 | .owner = THIS_MODULE, |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 659 | .of_match_table = of_match_ptr(wmt_dt_ids), |
Alexey Charkov | 304e126 | 2010-11-08 20:33:20 +0300 | [diff] [blame] | 660 | }, |
| 661 | }; |
| 662 | |
| 663 | static int __init vt8500_serial_init(void) |
| 664 | { |
| 665 | int ret; |
| 666 | |
| 667 | ret = uart_register_driver(&vt8500_uart_driver); |
| 668 | if (unlikely(ret)) |
| 669 | return ret; |
| 670 | |
| 671 | ret = platform_driver_register(&vt8500_platform_driver); |
| 672 | |
| 673 | if (unlikely(ret)) |
| 674 | uart_unregister_driver(&vt8500_uart_driver); |
| 675 | |
| 676 | return ret; |
| 677 | } |
| 678 | |
| 679 | static void __exit vt8500_serial_exit(void) |
| 680 | { |
| 681 | #ifdef CONFIG_SERIAL_VT8500_CONSOLE |
| 682 | unregister_console(&vt8500_console); |
| 683 | #endif |
| 684 | platform_driver_unregister(&vt8500_platform_driver); |
| 685 | uart_unregister_driver(&vt8500_uart_driver); |
| 686 | } |
| 687 | |
| 688 | module_init(vt8500_serial_init); |
| 689 | module_exit(vt8500_serial_exit); |
| 690 | |
| 691 | MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); |
| 692 | MODULE_DESCRIPTION("Driver for vt8500 serial device"); |
Tony Prisk | 4001130 | 2012-08-03 20:56:25 +1200 | [diff] [blame] | 693 | MODULE_LICENSE("GPL v2"); |