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authorDavid S. Miller <davem@sunset.davemloft.net>2006-02-11 05:25:21 -0500
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 04:12:18 -0500
commit02fd473bd4844befc74f7ca67cd60891e0a2d890 (patch)
tree4c338418dcfdd73c88d3ca8e969944be42cde60e /drivers
parent4bdff41464c2954c6f62f849df0e73eb9fa21c65 (diff)
[SPARC64]: Add SUN4V Hypervisor Console driver.
Since it can do things like BREAK and HUP, we implement this as a serial uart driver. This still needs interrupt probing code, as I haven't figured out how interrupts will work or be probed for on SUN4V yet. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/serial/Kconfig7
-rw-r--r--drivers/serial/Makefile1
-rw-r--r--drivers/serial/sunhv.c481
3 files changed, 489 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index b3c561abe3f6..89e5413cc2a3 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -582,6 +582,13 @@ config SERIAL_SUNSAB_CONSOLE
582 on your Sparc system as the console, you can do so by answering 582 on your Sparc system as the console, you can do so by answering
583 Y to this option. 583 Y to this option.
584 584
585config SERIAL_SUNHV
586 bool "Sun4v Hypervisor Console support"
587 depends on SPARC64
588 help
589 This driver supports the console device found on SUN4V Sparc
590 systems. Say Y if you want to be able to use this device.
591
585config SERIAL_IP22_ZILOG 592config SERIAL_IP22_ZILOG
586 tristate "IP22 Zilog8530 serial support" 593 tristate "IP22 Zilog8530 serial support"
587 depends on SGI_IP22 594 depends on SGI_IP22
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index eaf8e01db198..0f7f8d73d3ca 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o
34obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o 34obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
35obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o 35obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o
36obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o 36obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
37obj-$(CONFIG_SERIAL_SUNHV) += sunhv.o
37obj-$(CONFIG_SERIAL_MUX) += mux.o 38obj-$(CONFIG_SERIAL_MUX) += mux.o
38obj-$(CONFIG_SERIAL_68328) += 68328serial.o 39obj-$(CONFIG_SERIAL_68328) += 68328serial.o
39obj-$(CONFIG_SERIAL_68360) += 68360serial.o 40obj-$(CONFIG_SERIAL_68360) += 68360serial.o
diff --git a/drivers/serial/sunhv.c b/drivers/serial/sunhv.c
new file mode 100644
index 000000000000..2ba716eeb0bf
--- /dev/null
+++ b/drivers/serial/sunhv.c
@@ -0,0 +1,481 @@
1/* sunhv.c: Serial driver for SUN4V hypervisor console.
2 *
3 * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
4 */
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>
20
21#include <asm/hypervisor.h>
22#include <asm/spitfire.h>
23
24#if defined(CONFIG_MAGIC_SYSRQ)
25#define SUPPORT_SYSRQ
26#endif
27
28#include <linux/serial_core.h>
29
30#include "suncore.h"
31
32#define CON_BREAK ((long)-1)
33#define CON_HUP ((long)-2)
34
35static inline long hypervisor_con_getchar(long *status)
36{
37 register unsigned long func asm("%o5");
38 register unsigned long arg0 asm("%o0");
39 register unsigned long arg1 asm("%o1");
40
41 func = HV_FAST_CONS_GETCHAR;
42 arg0 = 0;
43 arg1 = 0;
44 __asm__ __volatile__("ta %6"
45 : "=&r" (func), "=&r" (arg0), "=&r" (arg1)
46 : "0" (func), "1" (arg0), "2" (arg1),
47 "i" (HV_FAST_TRAP));
48
49 *status = arg0;
50
51 return (long) arg1;
52}
53
54static inline long hypervisor_con_putchar(long ch)
55{
56 register unsigned long func asm("%o5");
57 register unsigned long arg0 asm("%o0");
58
59 func = HV_FAST_CONS_PUTCHAR;
60 arg0 = ch;
61 __asm__ __volatile__("ta %4"
62 : "=&r" (func), "=&r" (arg0)
63 : "0" (func), "1" (arg0), "i" (HV_FAST_TRAP));
64
65 return (long) arg0;
66}
67
68#define IGNORE_BREAK 0x1
69#define IGNORE_ALL 0x2
70
71static int hung_up = 0;
72
73static struct tty_struct *receive_chars(struct uart_port *port, struct pt_regs *regs)
74{
75 struct tty_struct *tty = NULL;
76 int saw_console_brk = 0;
77 int limit = 10000;
78
79 if (port->info != NULL) /* Unopened serial console */
80 tty = port->info->tty;
81
82 while (limit-- > 0) {
83 long status;
84 long c = hypervisor_con_getchar(&status);
85 unsigned char flag;
86
87 if (status == HV_EWOULDBLOCK)
88 break;
89
90 if (c == CON_BREAK) {
91 saw_console_brk = 1;
92 c = 0;
93 }
94
95 if (c == CON_HUP) {
96 hung_up = 1;
97 uart_handle_dcd_change(port, 0);
98 } else if (hung_up) {
99 hung_up = 0;
100 uart_handle_dcd_change(port, 1);
101 }
102
103 if (tty == NULL) {
104 uart_handle_sysrq_char(port, c, regs);
105 continue;
106 }
107
108 flag = TTY_NORMAL;
109 port->icount.rx++;
110 if (c == CON_BREAK) {
111 port->icount.brk++;
112 if (uart_handle_break(port))
113 continue;
114 flag = TTY_BREAK;
115 }
116
117 if (uart_handle_sysrq_char(port, c, regs))
118 continue;
119
120 if ((port->ignore_status_mask & IGNORE_ALL) ||
121 ((port->ignore_status_mask & IGNORE_BREAK) &&
122 (c == CON_BREAK)))
123 continue;
124
125 tty_insert_flip_char(tty, c, flag);
126 }
127
128 if (saw_console_brk)
129 sun_do_break();
130
131 return tty;
132}
133
134static void transmit_chars(struct uart_port *port)
135{
136 struct circ_buf *xmit = &port->info->xmit;
137
138 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
139 return;
140
141 while (!uart_circ_empty(xmit)) {
142 long status = hypervisor_con_putchar(xmit->buf[xmit->tail]);
143
144 if (status != HV_EOK)
145 break;
146
147 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
148 port->icount.tx++;
149 }
150
151 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
152 uart_write_wakeup(port);
153}
154
155static irqreturn_t sunhv_interrupt(int irq, void *dev_id, struct pt_regs *regs)
156{
157 struct uart_port *port = dev_id;
158 struct tty_struct *tty;
159 unsigned long flags;
160
161 spin_lock_irqsave(&port->lock, flags);
162 tty = receive_chars(port, regs);
163 transmit_chars(port);
164 spin_unlock_irqrestore(&port->lock, flags);
165
166 if (tty)
167 tty_flip_buffer_push(tty);
168
169 return IRQ_HANDLED;
170}
171
172/* port->lock is not held. */
173static unsigned int sunhv_tx_empty(struct uart_port *port)
174{
175 /* Transmitter is always empty for us. If the circ buffer
176 * is non-empty or there is an x_char pending, our caller
177 * will do the right thing and ignore what we return here.
178 */
179 return TIOCSER_TEMT;
180}
181
182/* port->lock held by caller. */
183static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl)
184{
185 return;
186}
187
188/* port->lock is held by caller and interrupts are disabled. */
189static unsigned int sunhv_get_mctrl(struct uart_port *port)
190{
191 return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
192}
193
194/* port->lock held by caller. */
195static void sunhv_stop_tx(struct uart_port *port)
196{
197 return;
198}
199
200/* port->lock held by caller. */
201static void sunhv_start_tx(struct uart_port *port)
202{
203 struct circ_buf *xmit = &port->info->xmit;
204 unsigned long flags;
205
206 spin_lock_irqsave(&port->lock, flags);
207
208 while (!uart_circ_empty(xmit)) {
209 long status = hypervisor_con_putchar(xmit->buf[xmit->tail]);
210
211 if (status != HV_EOK)
212 break;
213
214 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
215 port->icount.tx++;
216 }
217
218 spin_unlock_irqrestore(&port->lock, flags);
219}
220
221/* port->lock is not held. */
222static void sunhv_send_xchar(struct uart_port *port, char ch)
223{
224 unsigned long flags;
225 int limit = 10000;
226
227 spin_lock_irqsave(&port->lock, flags);
228
229 while (limit-- > 0) {
230 long status = hypervisor_con_putchar(ch);
231 if (status == HV_EOK)
232 break;
233 }
234
235 spin_unlock_irqrestore(&port->lock, flags);
236}
237
238/* port->lock held by caller. */
239static void sunhv_stop_rx(struct uart_port *port)
240{
241}
242
243/* port->lock held by caller. */
244static void sunhv_enable_ms(struct uart_port *port)
245{
246}
247
248/* port->lock is not held. */
249static void sunhv_break_ctl(struct uart_port *port, int break_state)
250{
251 if (break_state) {
252 unsigned long flags;
253 int limit = 10000;
254
255 spin_lock_irqsave(&port->lock, flags);
256
257 while (limit-- > 0) {
258 long status = hypervisor_con_putchar(CON_BREAK);
259 if (status == HV_EOK)
260 break;
261 }
262
263 spin_unlock_irqrestore(&port->lock, flags);
264 }
265}
266
267/* port->lock is not held. */
268static int sunhv_startup(struct uart_port *port)
269{
270 return 0;
271}
272
273/* port->lock is not held. */
274static void sunhv_shutdown(struct uart_port *port)
275{
276}
277
278/* port->lock is not held. */
279static void sunhv_set_termios(struct uart_port *port, struct termios *termios,
280 struct termios *old)
281{
282 unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
283 unsigned int quot = uart_get_divisor(port, baud);
284 unsigned int iflag, cflag;
285 unsigned long flags;
286
287 spin_lock_irqsave(&port->lock, flags);
288
289 iflag = termios->c_iflag;
290 cflag = termios->c_cflag;
291
292 port->ignore_status_mask = 0;
293 if (iflag & IGNBRK)
294 port->ignore_status_mask |= IGNORE_BREAK;
295 if ((cflag & CREAD) == 0)
296 port->ignore_status_mask |= IGNORE_ALL;
297
298 /* XXX */
299 uart_update_timeout(port, cflag,
300 (port->uartclk / (16 * quot)));
301
302 spin_unlock_irqrestore(&port->lock, flags);
303}
304
305static const char *sunhv_type(struct uart_port *port)
306{
307 return "SUN4V HCONS";
308}
309
310static void sunhv_release_port(struct uart_port *port)
311{
312}
313
314static int sunhv_request_port(struct uart_port *port)
315{
316 return 0;
317}
318
319static void sunhv_config_port(struct uart_port *port, int flags)
320{
321}
322
323static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser)
324{
325 return -EINVAL;
326}
327
328static struct uart_ops sunhv_pops = {
329 .tx_empty = sunhv_tx_empty,
330 .set_mctrl = sunhv_set_mctrl,
331 .get_mctrl = sunhv_get_mctrl,
332 .stop_tx = sunhv_stop_tx,
333 .start_tx = sunhv_start_tx,
334 .send_xchar = sunhv_send_xchar,
335 .stop_rx = sunhv_stop_rx,
336 .enable_ms = sunhv_enable_ms,
337 .break_ctl = sunhv_break_ctl,
338 .startup = sunhv_startup,
339 .shutdown = sunhv_shutdown,
340 .set_termios = sunhv_set_termios,
341 .type = sunhv_type,
342 .release_port = sunhv_release_port,
343 .request_port = sunhv_request_port,
344 .config_port = sunhv_config_port,
345 .verify_port = sunhv_verify_port,
346};
347
348static struct uart_driver sunhv_reg = {
349 .owner = THIS_MODULE,
350 .driver_name = "serial",
351 .devfs_name = "tts/",
352 .dev_name = "ttyS",
353 .major = TTY_MAJOR,
354};
355
356static struct uart_port *sunhv_port;
357
358static inline void sunhv_console_putchar(struct uart_port *port, char c)
359{
360 unsigned long flags;
361 int limit = 10000;
362
363 spin_lock_irqsave(&port->lock, flags);
364
365 while (limit-- > 0) {
366 long status = hypervisor_con_putchar(c);
367 if (status == HV_EOK)
368 break;
369 }
370
371 spin_unlock_irqrestore(&port->lock, flags);
372}
373
374static void sunhv_console_write(struct console *con, const char *s, unsigned n)
375{
376 struct uart_port *port = sunhv_port;
377 int i;
378
379 for (i = 0; i < n; i++) {
380 if (*s == '\n')
381 sunhv_console_putchar(port, '\r');
382 sunhv_console_putchar(port, *s++);
383 }
384}
385
386static int sunhv_console_setup(struct console *con, char *options)
387{
388 return 0;
389}
390
391static struct console sunhv_console = {
392 .name = "ttyS",
393 .write = sunhv_console_write,
394 .device = uart_console_device,
395 .setup = sunhv_console_setup,
396 .flags = CON_PRINTBUFFER,
397 .index = -1,
398 .data = &sunhv_reg,
399};
400
401static void __init sunhv_console_init(void)
402{
403 if (con_is_present())
404 return;
405
406 sunhv_console.index = 0;
407 register_console(&sunhv_console);
408}
409
410static int __init sunhv_init(void)
411{
412 struct uart_port *port;
413 int ret;
414
415 if (tlb_type != hypervisor)
416 return -ENODEV;
417
418 port = kmalloc(sizeof(struct uart_port), GFP_KERNEL);
419 if (unlikely(!port))
420 return -ENOMEM;
421
422 port->line = 0;
423 port->ops = &sunhv_pops;
424 port->type = PORT_SUNHV;
425 port->uartclk = ( 29491200 / 16 ); /* arbitrary */
426
427 /* XXX Get interrupt. XXX */
428 if (request_irq(0 /* XXX */, sunhv_interrupt,
429 SA_SHIRQ, "serial(sunhv)", port)) {
430 printk("sunhv: Cannot get IRQ %x\n",
431 0 /* XXX */);
432 kfree(port);
433 return -ENODEV;
434 }
435
436 sunhv_reg.minor = sunserial_current_minor;
437 sunhv_reg.nr = 1;
438 sunhv_reg.cons = &sunhv_console;
439
440 ret = uart_register_driver(&sunhv_reg);
441 if (ret < 0) {
442 free_irq(0 /* XXX */, up);
443 kfree(port);
444
445 return ret;
446 }
447
448 sunhv_port = port;
449
450 sunserial_current_minor += 1;
451
452 sunhv_console_init();
453
454 uart_add_one_port(&sunhv_reg, port);
455
456 return 0;
457}
458
459static void __exit sunhv_exit(void)
460{
461 struct uart_port *port = sunhv_port;
462
463 BUG_ON(!port);
464
465 uart_remove_one_port(&sunhv_reg, port);
466 free_irq(0 /* XXX */, port);
467
468 sunserial_current_minor -= 1;
469
470 uart_unregister_driver(&sunhv_reg);
471
472 kfree(sunhv_port);
473 sunhv_port = NULL;
474}
475
476module_init(sunhv_init);
477module_exit(sunhv_exit);
478
479MODULE_AUTHOR("David S. Miller");
480MODULE_DESCRIPTION("SUN4V Hypervisor console driver")
481MODULE_LICENSE("GPL");