blob: a779e22d213ee3abd9f5c1cfa6f267a4fdba96c8 [file] [log] [blame]
David S. Miller02fd4732006-02-11 02:25:21 -08001/* sunhv.c: Serial driver for SUN4V hypervisor console.
2 *
David S. Millerc7754d42007-05-15 17:03:54 -07003 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
David S. Miller02fd4732006-02-11 02:25:21 -08004 */
5
6#include <linux/module.h>
7#include <linux/kernel.h>
8#include <linux/errno.h>
9#include <linux/tty.h>
10#include <linux/tty_flip.h>
11#include <linux/major.h>
12#include <linux/circ_buf.h>
13#include <linux/serial.h>
14#include <linux/sysrq.h>
15#include <linux/console.h>
16#include <linux/spinlock.h>
17#include <linux/slab.h>
18#include <linux/delay.h>
19#include <linux/init.h>
Stephen Rothwellc6ed4132008-08-11 14:30:53 -070020#include <linux/of_device.h>
David S. Miller02fd4732006-02-11 02:25:21 -080021
22#include <asm/hypervisor.h>
23#include <asm/spitfire.h>
David S. Miller93872ba2006-06-30 00:00:22 -070024#include <asm/prom.h>
David S. Millerf4266ab2006-02-13 20:43:02 -080025#include <asm/irq.h>
David S. Miller02fd4732006-02-11 02:25:21 -080026
27#if defined(CONFIG_MAGIC_SYSRQ)
28#define SUPPORT_SYSRQ
29#endif
30
31#include <linux/serial_core.h>
32
33#include "suncore.h"
34
35#define CON_BREAK ((long)-1)
36#define CON_HUP ((long)-2)
37
David S. Miller02fd4732006-02-11 02:25:21 -080038#define IGNORE_BREAK 0x1
39#define IGNORE_ALL 0x2
40
David S. Millerc7754d42007-05-15 17:03:54 -070041static char *con_write_page;
42static char *con_read_page;
43
David S. Miller02fd4732006-02-11 02:25:21 -080044static int hung_up = 0;
45
David S. Millerc7754d42007-05-15 17:03:54 -070046static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit)
David S. Miller02fd4732006-02-11 02:25:21 -080047{
David S. Millerc7754d42007-05-15 17:03:54 -070048 while (!uart_circ_empty(xmit)) {
49 long status = sun4v_con_putchar(xmit->buf[xmit->tail]);
50
51 if (status != HV_EOK)
52 break;
53
54 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
55 port->icount.tx++;
56 }
57}
58
59static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit)
60{
61 while (!uart_circ_empty(xmit)) {
62 unsigned long ra = __pa(xmit->buf + xmit->tail);
63 unsigned long len, status, sent;
64
65 len = CIRC_CNT_TO_END(xmit->head, xmit->tail,
66 UART_XMIT_SIZE);
67 status = sun4v_con_write(ra, len, &sent);
68 if (status != HV_EOK)
69 break;
70 xmit->tail = (xmit->tail + sent) & (UART_XMIT_SIZE - 1);
71 port->icount.tx += sent;
72 }
73}
74
75static int receive_chars_getchar(struct uart_port *port, struct tty_struct *tty)
76{
David S. Miller02fd4732006-02-11 02:25:21 -080077 int saw_console_brk = 0;
78 int limit = 10000;
79
David S. Miller02fd4732006-02-11 02:25:21 -080080 while (limit-- > 0) {
81 long status;
David S. Millerc7754d42007-05-15 17:03:54 -070082 long c = sun4v_con_getchar(&status);
David S. Miller02fd4732006-02-11 02:25:21 -080083
84 if (status == HV_EWOULDBLOCK)
85 break;
86
87 if (c == CON_BREAK) {
David S. Miller135066a2006-02-16 00:42:21 -080088 if (uart_handle_break(port))
89 continue;
David S. Miller02fd4732006-02-11 02:25:21 -080090 saw_console_brk = 1;
91 c = 0;
92 }
93
94 if (c == CON_HUP) {
95 hung_up = 1;
96 uart_handle_dcd_change(port, 0);
97 } else if (hung_up) {
98 hung_up = 0;
99 uart_handle_dcd_change(port, 1);
100 }
101
102 if (tty == NULL) {
David Howells7d12e782006-10-05 14:55:46 +0100103 uart_handle_sysrq_char(port, c);
David S. Miller02fd4732006-02-11 02:25:21 -0800104 continue;
105 }
106
David S. Miller02fd4732006-02-11 02:25:21 -0800107 port->icount.rx++;
David S. Miller02fd4732006-02-11 02:25:21 -0800108
David Howells7d12e782006-10-05 14:55:46 +0100109 if (uart_handle_sysrq_char(port, c))
David S. Miller02fd4732006-02-11 02:25:21 -0800110 continue;
111
David S. Millerc7754d42007-05-15 17:03:54 -0700112 tty_insert_flip_char(tty, c, TTY_NORMAL);
David S. Miller02fd4732006-02-11 02:25:21 -0800113 }
114
David S. Millerc7754d42007-05-15 17:03:54 -0700115 return saw_console_brk;
116}
117
118static int receive_chars_read(struct uart_port *port, struct tty_struct *tty)
119{
120 int saw_console_brk = 0;
121 int limit = 10000;
122
123 while (limit-- > 0) {
124 unsigned long ra = __pa(con_read_page);
125 unsigned long bytes_read, i;
126 long stat = sun4v_con_read(ra, PAGE_SIZE, &bytes_read);
127
128 if (stat != HV_EOK) {
129 bytes_read = 0;
130
131 if (stat == CON_BREAK) {
132 if (uart_handle_break(port))
133 continue;
134 saw_console_brk = 1;
135 *con_read_page = 0;
136 bytes_read = 1;
137 } else if (stat == CON_HUP) {
138 hung_up = 1;
139 uart_handle_dcd_change(port, 0);
140 continue;
141 } else {
142 /* HV_EWOULDBLOCK, etc. */
143 break;
144 }
145 }
146
147 if (hung_up) {
148 hung_up = 0;
149 uart_handle_dcd_change(port, 1);
150 }
151
152 for (i = 0; i < bytes_read; i++)
153 uart_handle_sysrq_char(port, con_read_page[i]);
154
155 if (tty == NULL)
156 continue;
157
158 port->icount.rx += bytes_read;
159
160 tty_insert_flip_string(tty, con_read_page, bytes_read);
161 }
162
163 return saw_console_brk;
164}
165
166struct sunhv_ops {
167 void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit);
168 int (*receive_chars)(struct uart_port *port, struct tty_struct *tty);
169};
170
171static struct sunhv_ops bychar_ops = {
172 .transmit_chars = transmit_chars_putchar,
173 .receive_chars = receive_chars_getchar,
174};
175
176static struct sunhv_ops bywrite_ops = {
177 .transmit_chars = transmit_chars_write,
178 .receive_chars = receive_chars_read,
179};
180
181static struct sunhv_ops *sunhv_ops = &bychar_ops;
182
183static struct tty_struct *receive_chars(struct uart_port *port)
184{
185 struct tty_struct *tty = NULL;
186
Alan Coxebd2c8f2009-09-19 13:13:28 -0700187 if (port->state != NULL) /* Unopened serial console */
188 tty = port->state->port.tty;
David S. Millerc7754d42007-05-15 17:03:54 -0700189
190 if (sunhv_ops->receive_chars(port, tty))
David S. Miller02fd4732006-02-11 02:25:21 -0800191 sun_do_break();
192
193 return tty;
194}
195
196static void transmit_chars(struct uart_port *port)
197{
David S. Millerdb33f9b2006-02-15 21:56:49 -0800198 struct circ_buf *xmit;
David S. Miller02fd4732006-02-11 02:25:21 -0800199
Alan Coxebd2c8f2009-09-19 13:13:28 -0700200 if (!port->state)
David S. Millerdb33f9b2006-02-15 21:56:49 -0800201 return;
202
Alan Coxebd2c8f2009-09-19 13:13:28 -0700203 xmit = &port->state->xmit;
David S. Miller02fd4732006-02-11 02:25:21 -0800204 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
205 return;
206
David S. Millerc7754d42007-05-15 17:03:54 -0700207 sunhv_ops->transmit_chars(port, xmit);
David S. Miller02fd4732006-02-11 02:25:21 -0800208
209 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
210 uart_write_wakeup(port);
211}
212
David Howells7d12e782006-10-05 14:55:46 +0100213static irqreturn_t sunhv_interrupt(int irq, void *dev_id)
David S. Miller02fd4732006-02-11 02:25:21 -0800214{
215 struct uart_port *port = dev_id;
216 struct tty_struct *tty;
217 unsigned long flags;
218
219 spin_lock_irqsave(&port->lock, flags);
David Howells7d12e782006-10-05 14:55:46 +0100220 tty = receive_chars(port);
David S. Miller02fd4732006-02-11 02:25:21 -0800221 transmit_chars(port);
222 spin_unlock_irqrestore(&port->lock, flags);
223
224 if (tty)
225 tty_flip_buffer_push(tty);
226
227 return IRQ_HANDLED;
228}
229
230/* port->lock is not held. */
231static unsigned int sunhv_tx_empty(struct uart_port *port)
232{
233 /* Transmitter is always empty for us. If the circ buffer
234 * is non-empty or there is an x_char pending, our caller
235 * will do the right thing and ignore what we return here.
236 */
237 return TIOCSER_TEMT;
238}
239
240/* port->lock held by caller. */
241static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl)
242{
243 return;
244}
245
246/* port->lock is held by caller and interrupts are disabled. */
247static unsigned int sunhv_get_mctrl(struct uart_port *port)
248{
249 return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
250}
251
252/* port->lock held by caller. */
253static void sunhv_stop_tx(struct uart_port *port)
254{
255 return;
256}
257
258/* port->lock held by caller. */
259static void sunhv_start_tx(struct uart_port *port)
260{
David S. Millerf7986342007-07-16 17:05:11 -0700261 transmit_chars(port);
David S. Miller02fd4732006-02-11 02:25:21 -0800262}
263
264/* port->lock is not held. */
265static void sunhv_send_xchar(struct uart_port *port, char ch)
266{
267 unsigned long flags;
268 int limit = 10000;
269
270 spin_lock_irqsave(&port->lock, flags);
271
272 while (limit-- > 0) {
David S. Millerc7754d42007-05-15 17:03:54 -0700273 long status = sun4v_con_putchar(ch);
David S. Miller02fd4732006-02-11 02:25:21 -0800274 if (status == HV_EOK)
275 break;
David S. Millerc7754d42007-05-15 17:03:54 -0700276 udelay(1);
David S. Miller02fd4732006-02-11 02:25:21 -0800277 }
278
279 spin_unlock_irqrestore(&port->lock, flags);
280}
281
282/* port->lock held by caller. */
283static void sunhv_stop_rx(struct uart_port *port)
284{
285}
286
287/* port->lock held by caller. */
288static void sunhv_enable_ms(struct uart_port *port)
289{
290}
291
292/* port->lock is not held. */
293static void sunhv_break_ctl(struct uart_port *port, int break_state)
294{
295 if (break_state) {
296 unsigned long flags;
David S. Millerc7754d42007-05-15 17:03:54 -0700297 int limit = 10000;
David S. Miller02fd4732006-02-11 02:25:21 -0800298
299 spin_lock_irqsave(&port->lock, flags);
300
301 while (limit-- > 0) {
David S. Millerc7754d42007-05-15 17:03:54 -0700302 long status = sun4v_con_putchar(CON_BREAK);
David S. Miller02fd4732006-02-11 02:25:21 -0800303 if (status == HV_EOK)
304 break;
David S. Millerc7754d42007-05-15 17:03:54 -0700305 udelay(1);
David S. Miller02fd4732006-02-11 02:25:21 -0800306 }
307
308 spin_unlock_irqrestore(&port->lock, flags);
309 }
310}
311
312/* port->lock is not held. */
313static int sunhv_startup(struct uart_port *port)
314{
315 return 0;
316}
317
318/* port->lock is not held. */
319static void sunhv_shutdown(struct uart_port *port)
320{
321}
322
323/* port->lock is not held. */
Alan Cox606d0992006-12-08 02:38:45 -0800324static void sunhv_set_termios(struct uart_port *port, struct ktermios *termios,
325 struct ktermios *old)
David S. Miller02fd4732006-02-11 02:25:21 -0800326{
327 unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
328 unsigned int quot = uart_get_divisor(port, baud);
329 unsigned int iflag, cflag;
330 unsigned long flags;
331
332 spin_lock_irqsave(&port->lock, flags);
333
334 iflag = termios->c_iflag;
335 cflag = termios->c_cflag;
336
337 port->ignore_status_mask = 0;
338 if (iflag & IGNBRK)
339 port->ignore_status_mask |= IGNORE_BREAK;
340 if ((cflag & CREAD) == 0)
341 port->ignore_status_mask |= IGNORE_ALL;
342
343 /* XXX */
344 uart_update_timeout(port, cflag,
345 (port->uartclk / (16 * quot)));
346
347 spin_unlock_irqrestore(&port->lock, flags);
348}
349
350static const char *sunhv_type(struct uart_port *port)
351{
352 return "SUN4V HCONS";
353}
354
355static void sunhv_release_port(struct uart_port *port)
356{
357}
358
359static int sunhv_request_port(struct uart_port *port)
360{
361 return 0;
362}
363
364static void sunhv_config_port(struct uart_port *port, int flags)
365{
366}
367
368static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser)
369{
370 return -EINVAL;
371}
372
373static struct uart_ops sunhv_pops = {
374 .tx_empty = sunhv_tx_empty,
375 .set_mctrl = sunhv_set_mctrl,
376 .get_mctrl = sunhv_get_mctrl,
377 .stop_tx = sunhv_stop_tx,
378 .start_tx = sunhv_start_tx,
379 .send_xchar = sunhv_send_xchar,
380 .stop_rx = sunhv_stop_rx,
381 .enable_ms = sunhv_enable_ms,
382 .break_ctl = sunhv_break_ctl,
383 .startup = sunhv_startup,
384 .shutdown = sunhv_shutdown,
385 .set_termios = sunhv_set_termios,
386 .type = sunhv_type,
387 .release_port = sunhv_release_port,
388 .request_port = sunhv_request_port,
389 .config_port = sunhv_config_port,
390 .verify_port = sunhv_verify_port,
391};
392
393static struct uart_driver sunhv_reg = {
394 .owner = THIS_MODULE,
David S. Miller32039f42008-05-01 01:14:27 -0700395 .driver_name = "sunhv",
David S. Miller02fd4732006-02-11 02:25:21 -0800396 .dev_name = "ttyS",
397 .major = TTY_MAJOR,
398};
399
400static struct uart_port *sunhv_port;
401
David S. Millerc7754d42007-05-15 17:03:54 -0700402/* Copy 's' into the con_write_page, decoding "\n" into
403 * "\r\n" along the way. We have to return two lengths
404 * because the caller needs to know how much to advance
405 * 's' and also how many bytes to output via con_write_page.
406 */
407static int fill_con_write_page(const char *s, unsigned int n,
408 unsigned long *page_bytes)
David S. Miller02fd4732006-02-11 02:25:21 -0800409{
David S. Millerc7754d42007-05-15 17:03:54 -0700410 const char *orig_s = s;
411 char *p = con_write_page;
412 int left = PAGE_SIZE;
413
414 while (n--) {
415 if (*s == '\n') {
416 if (left < 2)
417 break;
418 *p++ = '\r';
419 left--;
420 } else if (left < 1)
421 break;
422 *p++ = *s++;
423 left--;
424 }
425 *page_bytes = p - con_write_page;
426 return s - orig_s;
427}
428
429static void sunhv_console_write_paged(struct console *con, const char *s, unsigned n)
430{
431 struct uart_port *port = sunhv_port;
David S. Miller02fd4732006-02-11 02:25:21 -0800432 unsigned long flags;
David S. Millerf3c681c2007-07-15 23:53:32 -0700433 int locked = 1;
David S. Miller02fd4732006-02-11 02:25:21 -0800434
David S. Millerf3c681c2007-07-15 23:53:32 -0700435 local_irq_save(flags);
436 if (port->sysrq) {
437 locked = 0;
438 } else if (oops_in_progress) {
439 locked = spin_trylock(&port->lock);
440 } else
441 spin_lock(&port->lock);
442
David S. Millerc7754d42007-05-15 17:03:54 -0700443 while (n > 0) {
444 unsigned long ra = __pa(con_write_page);
445 unsigned long page_bytes;
446 unsigned int cpy = fill_con_write_page(s, n,
447 &page_bytes);
David S. Miller02fd4732006-02-11 02:25:21 -0800448
David S. Millerc7754d42007-05-15 17:03:54 -0700449 n -= cpy;
450 s += cpy;
451 while (page_bytes > 0) {
452 unsigned long written;
453 int limit = 1000000;
454
455 while (limit--) {
456 unsigned long stat;
457
458 stat = sun4v_con_write(ra, page_bytes,
459 &written);
460 if (stat == HV_EOK)
461 break;
462 udelay(1);
463 }
Roel Kluin52e36322009-06-22 18:41:56 +0100464 if (limit < 0)
David S. Millerc7754d42007-05-15 17:03:54 -0700465 break;
466 page_bytes -= written;
467 ra += written;
468 }
David S. Miller02fd4732006-02-11 02:25:21 -0800469 }
David S. Millerf3c681c2007-07-15 23:53:32 -0700470
471 if (locked)
472 spin_unlock(&port->lock);
473 local_irq_restore(flags);
David S. Miller02fd4732006-02-11 02:25:21 -0800474}
475
David S. Millerc7754d42007-05-15 17:03:54 -0700476static inline void sunhv_console_putchar(struct uart_port *port, char c)
477{
478 int limit = 1000000;
479
480 while (limit-- > 0) {
481 long status = sun4v_con_putchar(c);
482 if (status == HV_EOK)
483 break;
484 udelay(1);
485 }
486}
487
488static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n)
David S. Miller02fd4732006-02-11 02:25:21 -0800489{
490 struct uart_port *port = sunhv_port;
David S. Millerc7754d42007-05-15 17:03:54 -0700491 unsigned long flags;
David S. Millerf3c681c2007-07-15 23:53:32 -0700492 int i, locked = 1;
493
494 local_irq_save(flags);
495 if (port->sysrq) {
496 locked = 0;
497 } else if (oops_in_progress) {
498 locked = spin_trylock(&port->lock);
499 } else
500 spin_lock(&port->lock);
David S. Miller02fd4732006-02-11 02:25:21 -0800501
502 for (i = 0; i < n; i++) {
503 if (*s == '\n')
504 sunhv_console_putchar(port, '\r');
505 sunhv_console_putchar(port, *s++);
506 }
David S. Millerf3c681c2007-07-15 23:53:32 -0700507
508 if (locked)
509 spin_unlock(&port->lock);
510 local_irq_restore(flags);
David S. Miller02fd4732006-02-11 02:25:21 -0800511}
512
David S. Miller02fd4732006-02-11 02:25:21 -0800513static struct console sunhv_console = {
David S. Millerd5a2aa22006-02-13 21:28:40 -0800514 .name = "ttyHV",
David S. Millerc7754d42007-05-15 17:03:54 -0700515 .write = sunhv_console_write_bychar,
David S. Miller02fd4732006-02-11 02:25:21 -0800516 .device = uart_console_device,
David S. Miller02fd4732006-02-11 02:25:21 -0800517 .flags = CON_PRINTBUFFER,
518 .index = -1,
519 .data = &sunhv_reg,
520};
521
David S. Miller93872ba2006-06-30 00:00:22 -0700522static int __devinit hv_probe(struct of_device *op, const struct of_device_id *match)
David S. Miller02fd4732006-02-11 02:25:21 -0800523{
524 struct uart_port *port;
David S. Millerc7754d42007-05-15 17:03:54 -0700525 unsigned long minor;
David S. Miller93872ba2006-06-30 00:00:22 -0700526 int err;
David S. Miller02fd4732006-02-11 02:25:21 -0800527
Grant Likely1636f8a2010-06-18 11:09:58 -0600528 if (op->archdata.irqs[0] == 0xffffffff)
David S. Miller02fd4732006-02-11 02:25:21 -0800529 return -ENODEV;
530
David S. Miller93872ba2006-06-30 00:00:22 -0700531 port = kzalloc(sizeof(struct uart_port), GFP_KERNEL);
David S. Miller02fd4732006-02-11 02:25:21 -0800532 if (unlikely(!port))
533 return -ENOMEM;
534
David S. Millerc7754d42007-05-15 17:03:54 -0700535 minor = 1;
536 if (sun4v_hvapi_register(HV_GRP_CORE, 1, &minor) == 0 &&
537 minor >= 1) {
538 err = -ENOMEM;
539 con_write_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
540 if (!con_write_page)
541 goto out_free_port;
542
543 con_read_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
544 if (!con_read_page)
545 goto out_free_con_write_page;
546
547 sunhv_console.write = sunhv_console_write_paged;
548 sunhv_ops = &bywrite_ops;
549 }
550
David S. Miller93872ba2006-06-30 00:00:22 -0700551 sunhv_port = port;
David S. Millerdb33f9b2006-02-15 21:56:49 -0800552
David S. Miller02fd4732006-02-11 02:25:21 -0800553 port->line = 0;
554 port->ops = &sunhv_pops;
555 port->type = PORT_SUNHV;
556 port->uartclk = ( 29491200 / 16 ); /* arbitrary */
557
David S. Millerdb33f9b2006-02-15 21:56:49 -0800558 port->membase = (unsigned char __iomem *) __pa(port);
559
Grant Likely1636f8a2010-06-18 11:09:58 -0600560 port->irq = op->archdata.irqs[0];
David S. Miller93872ba2006-06-30 00:00:22 -0700561
562 port->dev = &op->dev;
David S. Miller02fd4732006-02-11 02:25:21 -0800563
Martin Habets58d784a2007-12-11 03:37:04 -0800564 err = sunserial_register_minors(&sunhv_reg, 1);
David S. Miller93872ba2006-06-30 00:00:22 -0700565 if (err)
David S. Millerc7754d42007-05-15 17:03:54 -0700566 goto out_free_con_read_page;
David S. Miller02fd4732006-02-11 02:25:21 -0800567
Grant Likely61c7a082010-04-13 16:12:29 -0700568 sunserial_console_match(&sunhv_console, op->dev.of_node,
David S. Miller457931d2009-11-24 14:09:56 -0800569 &sunhv_reg, port->line, false);
David S. Millerd5a2aa22006-02-13 21:28:40 -0800570
David S. Miller93872ba2006-06-30 00:00:22 -0700571 err = uart_add_one_port(&sunhv_reg, port);
572 if (err)
573 goto out_unregister_driver;
David S. Miller02fd4732006-02-11 02:25:21 -0800574
David S. Miller93872ba2006-06-30 00:00:22 -0700575 err = request_irq(port->irq, sunhv_interrupt, 0, "hvcons", port);
576 if (err)
577 goto out_remove_port;
David S. Millerdb33f9b2006-02-15 21:56:49 -0800578
David S. Miller93872ba2006-06-30 00:00:22 -0700579 dev_set_drvdata(&op->dev, port);
David S. Miller02fd4732006-02-11 02:25:21 -0800580
581 return 0;
David S. Miller93872ba2006-06-30 00:00:22 -0700582
583out_remove_port:
584 uart_remove_one_port(&sunhv_reg, port);
585
586out_unregister_driver:
Martin Habets58d784a2007-12-11 03:37:04 -0800587 sunserial_unregister_minors(&sunhv_reg, 1);
David S. Miller93872ba2006-06-30 00:00:22 -0700588
David S. Millerc7754d42007-05-15 17:03:54 -0700589out_free_con_read_page:
590 kfree(con_read_page);
591
592out_free_con_write_page:
593 kfree(con_write_page);
594
David S. Miller93872ba2006-06-30 00:00:22 -0700595out_free_port:
596 kfree(port);
597 sunhv_port = NULL;
598 return err;
David S. Miller02fd4732006-02-11 02:25:21 -0800599}
600
David S. Miller93872ba2006-06-30 00:00:22 -0700601static int __devexit hv_remove(struct of_device *dev)
David S. Miller02fd4732006-02-11 02:25:21 -0800602{
David S. Miller93872ba2006-06-30 00:00:22 -0700603 struct uart_port *port = dev_get_drvdata(&dev->dev);
David S. Miller02fd4732006-02-11 02:25:21 -0800604
David S. Millerdb33f9b2006-02-15 21:56:49 -0800605 free_irq(port->irq, port);
606
David S. Miller02fd4732006-02-11 02:25:21 -0800607 uart_remove_one_port(&sunhv_reg, port);
David S. Miller02fd4732006-02-11 02:25:21 -0800608
Martin Habets58d784a2007-12-11 03:37:04 -0800609 sunserial_unregister_minors(&sunhv_reg, 1);
David S. Miller02fd4732006-02-11 02:25:21 -0800610
David S. Miller93872ba2006-06-30 00:00:22 -0700611 kfree(port);
David S. Miller02fd4732006-02-11 02:25:21 -0800612 sunhv_port = NULL;
David S. Miller93872ba2006-06-30 00:00:22 -0700613
614 dev_set_drvdata(&dev->dev, NULL);
615
616 return 0;
617}
618
David S. Millerfd098312008-08-31 01:23:17 -0700619static const struct of_device_id hv_match[] = {
David S. Miller93872ba2006-06-30 00:00:22 -0700620 {
621 .name = "console",
622 .compatible = "qcn",
623 },
David S. Miller7a05b592007-05-13 21:27:37 -0700624 {
625 .name = "console",
626 .compatible = "SUNW,sun4v-console",
627 },
David S. Miller93872ba2006-06-30 00:00:22 -0700628 {},
629};
630MODULE_DEVICE_TABLE(of, hv_match);
631
632static struct of_platform_driver hv_driver = {
Grant Likely40182942010-04-13 16:13:02 -0700633 .driver = {
634 .name = "hv",
635 .owner = THIS_MODULE,
636 .of_match_table = hv_match,
637 },
David S. Miller93872ba2006-06-30 00:00:22 -0700638 .probe = hv_probe,
639 .remove = __devexit_p(hv_remove),
640};
641
642static int __init sunhv_init(void)
643{
644 if (tlb_type != hypervisor)
645 return -ENODEV;
646
Grant Likely1ab1d632010-06-24 15:14:37 -0600647 return of_register_platform_driver(&hv_driver);
David S. Miller93872ba2006-06-30 00:00:22 -0700648}
649
650static void __exit sunhv_exit(void)
651{
Grant Likely1ab1d632010-06-24 15:14:37 -0600652 of_unregister_platform_driver(&hv_driver);
David S. Miller02fd4732006-02-11 02:25:21 -0800653}
654
655module_init(sunhv_init);
656module_exit(sunhv_exit);
657
658MODULE_AUTHOR("David S. Miller");
David S. Miller93872ba2006-06-30 00:00:22 -0700659MODULE_DESCRIPTION("SUN4V Hypervisor console driver");
660MODULE_VERSION("2.0");
David S. Miller02fd4732006-02-11 02:25:21 -0800661MODULE_LICENSE("GPL");