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1da177e4 LT |
1 | /* |
2 | ** mux.c: | |
3 | ** serial driver for the Mux console found in some PA-RISC servers. | |
4 | ** | |
5 | ** (c) Copyright 2002 Ryan Bradetich | |
6 | ** (c) Copyright 2002 Hewlett-Packard Company | |
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 | ** This Driver currently only supports the console (port 0) on the MUX. | |
14 | ** Additional work will be needed on this driver to enable the full | |
15 | ** functionality of the MUX. | |
16 | ** | |
17 | */ | |
18 | ||
1da177e4 | 19 | #include <linux/module.h> |
1da177e4 LT |
20 | #include <linux/ioport.h> |
21 | #include <linux/init.h> | |
22 | #include <linux/serial.h> | |
ee160a38 JS |
23 | #include <linux/tty.h> |
24 | #include <linux/tty_flip.h> | |
1da177e4 | 25 | #include <linux/console.h> |
1da177e4 LT |
26 | #include <linux/delay.h> /* for udelay */ |
27 | #include <linux/device.h> | |
28 | #include <asm/io.h> | |
ae8c75c1 | 29 | #include <asm/irq.h> |
1da177e4 LT |
30 | #include <asm/parisc-device.h> |
31 | ||
22766ed8 | 32 | #if defined(CONFIG_SERIAL_MUX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
1da177e4 LT |
33 | #include <linux/sysrq.h> |
34 | #define SUPPORT_SYSRQ | |
35 | #endif | |
36 | ||
37 | #include <linux/serial_core.h> | |
38 | ||
39 | #define MUX_OFFSET 0x800 | |
40 | #define MUX_LINE_OFFSET 0x80 | |
41 | ||
42 | #define MUX_FIFO_SIZE 255 | |
43 | #define MUX_POLL_DELAY (30 * HZ / 1000) | |
44 | ||
45 | #define IO_DATA_REG_OFFSET 0x3c | |
46 | #define IO_DCOUNT_REG_OFFSET 0x40 | |
47 | ||
48 | #define MUX_EOFIFO(status) ((status & 0xF000) == 0xF000) | |
49 | #define MUX_STATUS(status) ((status & 0xF000) == 0x8000) | |
50 | #define MUX_BREAK(status) ((status & 0xF000) == 0x2000) | |
51 | ||
52 | #define MUX_NR 256 | |
5076c158 | 53 | static unsigned int port_cnt __read_mostly; |
4bd5d827 RB |
54 | struct mux_port { |
55 | struct uart_port port; | |
56 | int enabled; | |
57 | }; | |
58 | static struct mux_port mux_ports[MUX_NR]; | |
1da177e4 LT |
59 | |
60 | static struct uart_driver mux_driver = { | |
61 | .owner = THIS_MODULE, | |
62 | .driver_name = "ttyB", | |
63 | .dev_name = "ttyB", | |
64 | .major = MUX_MAJOR, | |
65 | .minor = 0, | |
66 | .nr = MUX_NR, | |
67 | }; | |
68 | ||
69 | static struct timer_list mux_timer; | |
70 | ||
92495c0e RB |
71 | #define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + IO_DATA_REG_OFFSET) |
72 | #define UART_GET_FIFO_CNT(p) __raw_readl((p)->membase + IO_DCOUNT_REG_OFFSET) | |
61425445 RB |
73 | |
74 | /** | |
75 | * get_mux_port_count - Get the number of available ports on the Mux. | |
76 | * @dev: The parisc device. | |
77 | * | |
78 | * This function is used to determine the number of ports the Mux | |
79 | * supports. The IODC data reports the number of ports the Mux | |
80 | * can support, but there are cases where not all the Mux ports | |
81 | * are connected. This function can override the IODC and | |
82 | * return the true port count. | |
83 | */ | |
84 | static int __init get_mux_port_count(struct parisc_device *dev) | |
85 | { | |
514fb84e | 86 | int status; |
61425445 RB |
87 | u8 iodc_data[32]; |
88 | unsigned long bytecnt; | |
89 | ||
61425445 RB |
90 | /* If this is the built-in Mux for the K-Class (Eole CAP/MUX), |
91 | * we only need to allocate resources for 1 port since the | |
92 | * other 7 ports are not connected. | |
93 | */ | |
514fb84e | 94 | if(dev->id.hversion == 0x15) |
61425445 RB |
95 | return 1; |
96 | ||
514fb84e RB |
97 | status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32); |
98 | BUG_ON(status != PDC_OK); | |
99 | ||
61425445 RB |
100 | /* Return the number of ports specified in the iodc data. */ |
101 | return ((((iodc_data)[4] & 0xf0) >> 4) * 8) + 8; | |
102 | } | |
1da177e4 LT |
103 | |
104 | /** | |
105 | * mux_tx_empty - Check if the transmitter fifo is empty. | |
106 | * @port: Ptr to the uart_port. | |
107 | * | |
108 | * This function test if the transmitter fifo for the port | |
109 | * described by 'port' is empty. If it is empty, this function | |
110 | * should return TIOCSER_TEMT, otherwise return 0. | |
111 | */ | |
112 | static unsigned int mux_tx_empty(struct uart_port *port) | |
113 | { | |
92495c0e | 114 | return UART_GET_FIFO_CNT(port) ? 0 : TIOCSER_TEMT; |
1da177e4 LT |
115 | } |
116 | ||
117 | /** | |
118 | * mux_set_mctrl - Set the current state of the modem control inputs. | |
119 | * @ports: Ptr to the uart_port. | |
120 | * @mctrl: Modem control bits. | |
121 | * | |
122 | * The Serial MUX does not support CTS, DCD or DSR so this function | |
123 | * is ignored. | |
124 | */ | |
125 | static void mux_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
126 | { | |
127 | } | |
128 | ||
129 | /** | |
130 | * mux_get_mctrl - Returns the current state of modem control inputs. | |
131 | * @port: Ptr to the uart_port. | |
132 | * | |
133 | * The Serial MUX does not support CTS, DCD or DSR so these lines are | |
134 | * treated as permanently active. | |
135 | */ | |
136 | static unsigned int mux_get_mctrl(struct uart_port *port) | |
137 | { | |
138 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; | |
139 | } | |
140 | ||
141 | /** | |
142 | * mux_stop_tx - Stop transmitting characters. | |
143 | * @port: Ptr to the uart_port. | |
1da177e4 LT |
144 | * |
145 | * The Serial MUX does not support this function. | |
146 | */ | |
b129a8cc | 147 | static void mux_stop_tx(struct uart_port *port) |
1da177e4 LT |
148 | { |
149 | } | |
150 | ||
151 | /** | |
152 | * mux_start_tx - Start transmitting characters. | |
153 | * @port: Ptr to the uart_port. | |
1da177e4 LT |
154 | * |
155 | * The Serial Mux does not support this function. | |
156 | */ | |
b129a8cc | 157 | static void mux_start_tx(struct uart_port *port) |
1da177e4 LT |
158 | { |
159 | } | |
160 | ||
161 | /** | |
162 | * mux_stop_rx - Stop receiving characters. | |
163 | * @port: Ptr to the uart_port. | |
164 | * | |
165 | * The Serial Mux does not support this function. | |
166 | */ | |
167 | static void mux_stop_rx(struct uart_port *port) | |
168 | { | |
169 | } | |
170 | ||
1da177e4 LT |
171 | /** |
172 | * mux_break_ctl - Control the transmitssion of a break signal. | |
173 | * @port: Ptr to the uart_port. | |
174 | * @break_state: Raise/Lower the break signal. | |
175 | * | |
176 | * The Serial Mux does not support this function. | |
177 | */ | |
178 | static void mux_break_ctl(struct uart_port *port, int break_state) | |
179 | { | |
180 | } | |
181 | ||
182 | /** | |
183 | * mux_write - Write chars to the mux fifo. | |
184 | * @port: Ptr to the uart_port. | |
185 | * | |
186 | * This function writes all the data from the uart buffer to | |
187 | * the mux fifo. | |
188 | */ | |
189 | static void mux_write(struct uart_port *port) | |
190 | { | |
191 | int count; | |
ebd2c8f6 | 192 | struct circ_buf *xmit = &port->state->xmit; |
1da177e4 LT |
193 | |
194 | if(port->x_char) { | |
195 | UART_PUT_CHAR(port, port->x_char); | |
196 | port->icount.tx++; | |
197 | port->x_char = 0; | |
198 | return; | |
199 | } | |
200 | ||
201 | if(uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
b129a8cc | 202 | mux_stop_tx(port); |
1da177e4 LT |
203 | return; |
204 | } | |
205 | ||
206 | count = (port->fifosize) - UART_GET_FIFO_CNT(port); | |
207 | do { | |
208 | UART_PUT_CHAR(port, xmit->buf[xmit->tail]); | |
209 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
210 | port->icount.tx++; | |
211 | if(uart_circ_empty(xmit)) | |
212 | break; | |
213 | ||
214 | } while(--count > 0); | |
215 | ||
216 | while(UART_GET_FIFO_CNT(port)) | |
217 | udelay(1); | |
218 | ||
219 | if(uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
220 | uart_write_wakeup(port); | |
221 | ||
222 | if (uart_circ_empty(xmit)) | |
b129a8cc | 223 | mux_stop_tx(port); |
1da177e4 LT |
224 | } |
225 | ||
226 | /** | |
227 | * mux_read - Read chars from the mux fifo. | |
228 | * @port: Ptr to the uart_port. | |
229 | * | |
230 | * This reads all available data from the mux's fifo and pushes | |
231 | * the data to the tty layer. | |
232 | */ | |
233 | static void mux_read(struct uart_port *port) | |
234 | { | |
92a19f9c | 235 | struct tty_port *tport = &port->state->port; |
1da177e4 | 236 | int data; |
1da177e4 LT |
237 | __u32 start_count = port->icount.rx; |
238 | ||
239 | while(1) { | |
92495c0e | 240 | data = __raw_readl(port->membase + IO_DATA_REG_OFFSET); |
1da177e4 LT |
241 | |
242 | if (MUX_STATUS(data)) | |
243 | continue; | |
244 | ||
245 | if (MUX_EOFIFO(data)) | |
246 | break; | |
247 | ||
1da177e4 LT |
248 | port->icount.rx++; |
249 | ||
250 | if (MUX_BREAK(data)) { | |
251 | port->icount.brk++; | |
252 | if(uart_handle_break(port)) | |
253 | continue; | |
254 | } | |
255 | ||
be577a52 | 256 | if (uart_handle_sysrq_char(port, data & 0xffu)) |
1da177e4 LT |
257 | continue; |
258 | ||
92a19f9c | 259 | tty_insert_flip_char(tport, data & 0xFF, TTY_NORMAL); |
1da177e4 LT |
260 | } |
261 | ||
2e124b4a JS |
262 | if (start_count != port->icount.rx) |
263 | tty_flip_buffer_push(tport); | |
1da177e4 LT |
264 | } |
265 | ||
266 | /** | |
267 | * mux_startup - Initialize the port. | |
268 | * @port: Ptr to the uart_port. | |
269 | * | |
270 | * Grab any resources needed for this port and start the | |
271 | * mux timer. | |
272 | */ | |
273 | static int mux_startup(struct uart_port *port) | |
274 | { | |
4bd5d827 | 275 | mux_ports[port->line].enabled = 1; |
1da177e4 LT |
276 | return 0; |
277 | } | |
278 | ||
279 | /** | |
280 | * mux_shutdown - Disable the port. | |
281 | * @port: Ptr to the uart_port. | |
282 | * | |
283 | * Release any resources needed for the port. | |
284 | */ | |
285 | static void mux_shutdown(struct uart_port *port) | |
286 | { | |
4bd5d827 | 287 | mux_ports[port->line].enabled = 0; |
1da177e4 LT |
288 | } |
289 | ||
290 | /** | |
291 | * mux_set_termios - Chane port parameters. | |
292 | * @port: Ptr to the uart_port. | |
293 | * @termios: new termios settings. | |
294 | * @old: old termios settings. | |
295 | * | |
296 | * The Serial Mux does not support this function. | |
297 | */ | |
298 | static void | |
606d099c AC |
299 | mux_set_termios(struct uart_port *port, struct ktermios *termios, |
300 | struct ktermios *old) | |
1da177e4 LT |
301 | { |
302 | } | |
303 | ||
304 | /** | |
305 | * mux_type - Describe the port. | |
306 | * @port: Ptr to the uart_port. | |
307 | * | |
308 | * Return a pointer to a string constant describing the | |
309 | * specified port. | |
310 | */ | |
311 | static const char *mux_type(struct uart_port *port) | |
312 | { | |
313 | return "Mux"; | |
314 | } | |
315 | ||
316 | /** | |
317 | * mux_release_port - Release memory and IO regions. | |
318 | * @port: Ptr to the uart_port. | |
319 | * | |
320 | * Release any memory and IO region resources currently in use by | |
321 | * the port. | |
322 | */ | |
323 | static void mux_release_port(struct uart_port *port) | |
324 | { | |
325 | } | |
326 | ||
327 | /** | |
328 | * mux_request_port - Request memory and IO regions. | |
329 | * @port: Ptr to the uart_port. | |
330 | * | |
331 | * Request any memory and IO region resources required by the port. | |
332 | * If any fail, no resources should be registered when this function | |
333 | * returns, and it should return -EBUSY on failure. | |
334 | */ | |
335 | static int mux_request_port(struct uart_port *port) | |
336 | { | |
337 | return 0; | |
338 | } | |
339 | ||
340 | /** | |
341 | * mux_config_port - Perform port autoconfiguration. | |
342 | * @port: Ptr to the uart_port. | |
343 | * @type: Bitmask of required configurations. | |
344 | * | |
4bd5d827 | 345 | * Perform any autoconfiguration steps for the port. This function is |
1da177e4 LT |
346 | * called if the UPF_BOOT_AUTOCONF flag is specified for the port. |
347 | * [Note: This is required for now because of a bug in the Serial core. | |
348 | * rmk has already submitted a patch to linus, should be available for | |
349 | * 2.5.47.] | |
350 | */ | |
351 | static void mux_config_port(struct uart_port *port, int type) | |
352 | { | |
353 | port->type = PORT_MUX; | |
354 | } | |
355 | ||
356 | /** | |
357 | * mux_verify_port - Verify the port information. | |
358 | * @port: Ptr to the uart_port. | |
359 | * @ser: Ptr to the serial information. | |
360 | * | |
361 | * Verify the new serial port information contained within serinfo is | |
362 | * suitable for this port type. | |
363 | */ | |
364 | static int mux_verify_port(struct uart_port *port, struct serial_struct *ser) | |
365 | { | |
366 | if(port->membase == NULL) | |
367 | return -EINVAL; | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | /** | |
373 | * mux_drv_poll - Mux poll function. | |
374 | * @unused: Unused variable | |
375 | * | |
376 | * This function periodically polls the Serial MUX to check for new data. | |
377 | */ | |
378 | static void mux_poll(unsigned long unused) | |
379 | { | |
380 | int i; | |
381 | ||
382 | for(i = 0; i < port_cnt; ++i) { | |
4bd5d827 | 383 | if(!mux_ports[i].enabled) |
1da177e4 LT |
384 | continue; |
385 | ||
4bd5d827 RB |
386 | mux_read(&mux_ports[i].port); |
387 | mux_write(&mux_ports[i].port); | |
1da177e4 LT |
388 | } |
389 | ||
390 | mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY); | |
391 | } | |
392 | ||
393 | ||
394 | #ifdef CONFIG_SERIAL_MUX_CONSOLE | |
395 | static void mux_console_write(struct console *co, const char *s, unsigned count) | |
396 | { | |
3de7b648 RB |
397 | /* Wait until the FIFO drains. */ |
398 | while(UART_GET_FIFO_CNT(&mux_ports[0].port)) | |
399 | udelay(1); | |
400 | ||
401 | while(count--) { | |
402 | if(*s == '\n') { | |
403 | UART_PUT_CHAR(&mux_ports[0].port, '\r'); | |
404 | } | |
405 | UART_PUT_CHAR(&mux_ports[0].port, *s++); | |
406 | } | |
407 | ||
1da177e4 LT |
408 | } |
409 | ||
410 | static int mux_console_setup(struct console *co, char *options) | |
411 | { | |
412 | return 0; | |
413 | } | |
414 | ||
1da177e4 LT |
415 | static struct console mux_console = { |
416 | .name = "ttyB", | |
417 | .write = mux_console_write, | |
aa0bdd29 | 418 | .device = uart_console_device, |
1da177e4 LT |
419 | .setup = mux_console_setup, |
420 | .flags = CON_ENABLED | CON_PRINTBUFFER, | |
421 | .index = 0, | |
aa0bdd29 | 422 | .data = &mux_driver, |
1da177e4 LT |
423 | }; |
424 | ||
425 | #define MUX_CONSOLE &mux_console | |
426 | #else | |
427 | #define MUX_CONSOLE NULL | |
428 | #endif | |
429 | ||
430 | static struct uart_ops mux_pops = { | |
431 | .tx_empty = mux_tx_empty, | |
432 | .set_mctrl = mux_set_mctrl, | |
433 | .get_mctrl = mux_get_mctrl, | |
434 | .stop_tx = mux_stop_tx, | |
435 | .start_tx = mux_start_tx, | |
436 | .stop_rx = mux_stop_rx, | |
1da177e4 LT |
437 | .break_ctl = mux_break_ctl, |
438 | .startup = mux_startup, | |
439 | .shutdown = mux_shutdown, | |
440 | .set_termios = mux_set_termios, | |
441 | .type = mux_type, | |
442 | .release_port = mux_release_port, | |
443 | .request_port = mux_request_port, | |
444 | .config_port = mux_config_port, | |
445 | .verify_port = mux_verify_port, | |
446 | }; | |
447 | ||
448 | /** | |
449 | * mux_probe - Determine if the Serial Mux should claim this device. | |
450 | * @dev: The parisc device. | |
451 | * | |
452 | * Deterimine if the Serial Mux should claim this chip (return 0) | |
453 | * or not (return 1). | |
454 | */ | |
455 | static int __init mux_probe(struct parisc_device *dev) | |
456 | { | |
61425445 | 457 | int i, status; |
1da177e4 | 458 | |
61425445 | 459 | int port_count = get_mux_port_count(dev); |
752b9403 | 460 | printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.6\n", port_count); |
1da177e4 | 461 | |
c380f057 RB |
462 | dev_set_drvdata(&dev->dev, (void *)(long)port_count); |
463 | request_mem_region(dev->hpa.start + MUX_OFFSET, | |
464 | port_count * MUX_LINE_OFFSET, "Mux"); | |
1da177e4 LT |
465 | |
466 | if(!port_cnt) { | |
467 | mux_driver.cons = MUX_CONSOLE; | |
468 | ||
469 | status = uart_register_driver(&mux_driver); | |
470 | if(status) { | |
471 | printk(KERN_ERR "Serial mux: Unable to register driver.\n"); | |
472 | return 1; | |
473 | } | |
1da177e4 LT |
474 | } |
475 | ||
c380f057 RB |
476 | for(i = 0; i < port_count; ++i, ++port_cnt) { |
477 | struct uart_port *port = &mux_ports[port_cnt].port; | |
1da177e4 | 478 | port->iobase = 0; |
ae8c75c1 MW |
479 | port->mapbase = dev->hpa.start + MUX_OFFSET + |
480 | (i * MUX_LINE_OFFSET); | |
5076c158 | 481 | port->membase = ioremap_nocache(port->mapbase, MUX_LINE_OFFSET); |
9b4a1617 | 482 | port->iotype = UPIO_MEM; |
1da177e4 | 483 | port->type = PORT_MUX; |
d4e33fac | 484 | port->irq = 0; |
1da177e4 LT |
485 | port->uartclk = 0; |
486 | port->fifosize = MUX_FIFO_SIZE; | |
487 | port->ops = &mux_pops; | |
488 | port->flags = UPF_BOOT_AUTOCONF; | |
489 | port->line = port_cnt; | |
a137ce85 RB |
490 | |
491 | /* The port->timeout needs to match what is present in | |
492 | * uart_wait_until_sent in serial_core.c. Otherwise | |
493 | * the time spent in msleep_interruptable will be very | |
494 | * long, causing the appearance of a console hang. | |
495 | */ | |
496 | port->timeout = HZ / 50; | |
ae8c75c1 | 497 | spin_lock_init(&port->lock); |
752b9403 | 498 | |
1da177e4 LT |
499 | status = uart_add_one_port(&mux_driver, port); |
500 | BUG_ON(status); | |
501 | } | |
502 | ||
1da177e4 LT |
503 | return 0; |
504 | } | |
505 | ||
ae8d8a14 | 506 | static int mux_remove(struct parisc_device *dev) |
c380f057 | 507 | { |
752b9403 | 508 | int i, j; |
c380f057 RB |
509 | int port_count = (long)dev_get_drvdata(&dev->dev); |
510 | ||
c380f057 RB |
511 | /* Find Port 0 for this card in the mux_ports list. */ |
512 | for(i = 0; i < port_cnt; ++i) { | |
513 | if(mux_ports[i].port.mapbase == dev->hpa.start + MUX_OFFSET) | |
514 | break; | |
515 | } | |
516 | BUG_ON(i + port_count > port_cnt); | |
517 | ||
518 | /* Release the resources associated with each port on the device. */ | |
752b9403 | 519 | for(j = 0; j < port_count; ++j, ++i) { |
c380f057 RB |
520 | struct uart_port *port = &mux_ports[i].port; |
521 | ||
522 | uart_remove_one_port(&mux_driver, port); | |
523 | if(port->membase) | |
524 | iounmap(port->membase); | |
525 | } | |
526 | ||
527 | release_mem_region(dev->hpa.start + MUX_OFFSET, port_count * MUX_LINE_OFFSET); | |
1da177e4 LT |
528 | return 0; |
529 | } | |
530 | ||
752b9403 RB |
531 | /* Hack. This idea was taken from the 8250_gsc.c on how to properly order |
532 | * the serial port detection in the proper order. The idea is we always | |
533 | * want the builtin mux to be detected before addin mux cards, so we | |
534 | * specifically probe for the builtin mux cards first. | |
535 | * | |
536 | * This table only contains the parisc_device_id of known builtin mux | |
537 | * devices. All other mux cards will be detected by the generic mux_tbl. | |
538 | */ | |
539 | static struct parisc_device_id builtin_mux_tbl[] = { | |
540 | { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x15, 0x0000D }, /* All K-class */ | |
541 | { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x44, 0x0000D }, /* E35, E45, and E55 */ | |
542 | { 0, } | |
543 | }; | |
544 | ||
1da177e4 LT |
545 | static struct parisc_device_id mux_tbl[] = { |
546 | { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0000D }, | |
547 | { 0, } | |
548 | }; | |
549 | ||
752b9403 | 550 | MODULE_DEVICE_TABLE(parisc, builtin_mux_tbl); |
1da177e4 LT |
551 | MODULE_DEVICE_TABLE(parisc, mux_tbl); |
552 | ||
752b9403 RB |
553 | static struct parisc_driver builtin_serial_mux_driver = { |
554 | .name = "builtin_serial_mux", | |
555 | .id_table = builtin_mux_tbl, | |
556 | .probe = mux_probe, | |
2d47b716 | 557 | .remove = mux_remove, |
752b9403 RB |
558 | }; |
559 | ||
1da177e4 | 560 | static struct parisc_driver serial_mux_driver = { |
bdad1f83 | 561 | .name = "serial_mux", |
1da177e4 LT |
562 | .id_table = mux_tbl, |
563 | .probe = mux_probe, | |
2d47b716 | 564 | .remove = mux_remove, |
1da177e4 LT |
565 | }; |
566 | ||
567 | /** | |
8f4aafec | 568 | * mux_init - Serial MUX initialization procedure. |
1da177e4 LT |
569 | * |
570 | * Register the Serial MUX driver. | |
571 | */ | |
572 | static int __init mux_init(void) | |
573 | { | |
752b9403 RB |
574 | register_parisc_driver(&builtin_serial_mux_driver); |
575 | register_parisc_driver(&serial_mux_driver); | |
c380f057 RB |
576 | |
577 | if(port_cnt > 0) { | |
578 | /* Start the Mux timer */ | |
579 | init_timer(&mux_timer); | |
580 | mux_timer.function = mux_poll; | |
581 | mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY); | |
582 | ||
583 | #ifdef CONFIG_SERIAL_MUX_CONSOLE | |
584 | register_console(&mux_console); | |
585 | #endif | |
586 | } | |
587 | ||
752b9403 | 588 | return 0; |
1da177e4 LT |
589 | } |
590 | ||
591 | /** | |
592 | * mux_exit - Serial MUX cleanup procedure. | |
593 | * | |
594 | * Unregister the Serial MUX driver from the tty layer. | |
595 | */ | |
596 | static void __exit mux_exit(void) | |
597 | { | |
c380f057 RB |
598 | /* Delete the Mux timer. */ |
599 | if(port_cnt > 0) { | |
0f1e126b | 600 | del_timer_sync(&mux_timer); |
c380f057 RB |
601 | #ifdef CONFIG_SERIAL_MUX_CONSOLE |
602 | unregister_console(&mux_console); | |
603 | #endif | |
1da177e4 LT |
604 | } |
605 | ||
752b9403 | 606 | unregister_parisc_driver(&builtin_serial_mux_driver); |
c380f057 | 607 | unregister_parisc_driver(&serial_mux_driver); |
1da177e4 LT |
608 | uart_unregister_driver(&mux_driver); |
609 | } | |
610 | ||
611 | module_init(mux_init); | |
612 | module_exit(mux_exit); | |
613 | ||
614 | MODULE_AUTHOR("Ryan Bradetich"); | |
615 | MODULE_DESCRIPTION("Serial MUX driver"); | |
616 | MODULE_LICENSE("GPL"); | |
617 | MODULE_ALIAS_CHARDEV_MAJOR(MUX_MAJOR); |