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1// SPDX-License-Identifier: GPL-2.0
2/* sunhv.c: Serial driver for SUN4V hypervisor console.
3 *
4 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
5 */
6
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#include <linux/of_device.h>
21
22#include <asm/hypervisor.h>
23#include <asm/spitfire.h>
24#include <asm/prom.h>
25#include <asm/irq.h>
26#include <asm/setup.h>
27
28#include <linux/serial_core.h>
29#include <linux/sunserialcore.h>
30
31#define CON_BREAK ((long)-1)
32#define CON_HUP ((long)-2)
33
34#define IGNORE_BREAK 0x1
35#define IGNORE_ALL 0x2
36
37static char *con_write_page;
38static char *con_read_page;
39
40static int hung_up = 0;
41
42static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit)
43{
44 while (!uart_circ_empty(xmit)) {
45 long status = sun4v_con_putchar(xmit->buf[xmit->tail]);
46
47 if (status != HV_EOK)
48 break;
49
50 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
51 port->icount.tx++;
52 }
53}
54
55static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit)
56{
57 while (!uart_circ_empty(xmit)) {
58 unsigned long ra = __pa(xmit->buf + xmit->tail);
59 unsigned long len, status, sent;
60
61 len = CIRC_CNT_TO_END(xmit->head, xmit->tail,
62 UART_XMIT_SIZE);
63 status = sun4v_con_write(ra, len, &sent);
64 if (status != HV_EOK)
65 break;
66 xmit->tail = (xmit->tail + sent) & (UART_XMIT_SIZE - 1);
67 port->icount.tx += sent;
68 }
69}
70
71static int receive_chars_getchar(struct uart_port *port)
72{
73 int saw_console_brk = 0;
74 int limit = 10000;
75
76 while (limit-- > 0) {
77 long status;
78 long c = sun4v_con_getchar(&status);
79
80 if (status == HV_EWOULDBLOCK)
81 break;
82
83 if (c == CON_BREAK) {
84 if (uart_handle_break(port))
85 continue;
86 saw_console_brk = 1;
87 c = 0;
88 }
89
90 if (c == CON_HUP) {
91 hung_up = 1;
92 uart_handle_dcd_change(port, 0);
93 } else if (hung_up) {
94 hung_up = 0;
95 uart_handle_dcd_change(port, 1);
96 }
97
98 if (port->state == NULL) {
99 uart_handle_sysrq_char(port, c);
100 continue;
101 }
102
103 port->icount.rx++;
104
105 if (uart_handle_sysrq_char(port, c))
106 continue;
107
108 tty_insert_flip_char(&port->state->port, c, TTY_NORMAL);
109 }
110
111 return saw_console_brk;
112}
113
114static int receive_chars_read(struct uart_port *port)
115{
116 static int saw_console_brk;
117 int limit = 10000;
118
119 while (limit-- > 0) {
120 unsigned long ra = __pa(con_read_page);
121 unsigned long bytes_read, i;
122 long stat = sun4v_con_read(ra, PAGE_SIZE, &bytes_read);
123
124 if (stat != HV_EOK) {
125 bytes_read = 0;
126
127 if (stat == CON_BREAK) {
128 if (saw_console_brk)
129 sun_do_break();
130
131 if (uart_handle_break(port))
132 continue;
133 saw_console_brk = 1;
134 *con_read_page = 0;
135 bytes_read = 1;
136 } else if (stat == CON_HUP) {
137 hung_up = 1;
138 uart_handle_dcd_change(port, 0);
139 continue;
140 } else {
141 /* HV_EWOULDBLOCK, etc. */
142 break;
143 }
144 }
145
146 if (hung_up) {
147 hung_up = 0;
148 uart_handle_dcd_change(port, 1);
149 }
150
151 if (port->sysrq != 0 && *con_read_page) {
152 for (i = 0; i < bytes_read; i++)
153 uart_handle_sysrq_char(port, con_read_page[i]);
154 saw_console_brk = 0;
155 }
156
157 if (port->state == NULL)
158 continue;
159
160 port->icount.rx += bytes_read;
161
162 tty_insert_flip_string(&port->state->port, con_read_page,
163 bytes_read);
164 }
165
166 return saw_console_brk;
167}
168
169struct sunhv_ops {
170 void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit);
171 int (*receive_chars)(struct uart_port *port);
172};
173
174static const struct sunhv_ops bychar_ops = {
175 .transmit_chars = transmit_chars_putchar,
176 .receive_chars = receive_chars_getchar,
177};
178
179static const struct sunhv_ops bywrite_ops = {
180 .transmit_chars = transmit_chars_write,
181 .receive_chars = receive_chars_read,
182};
183
184static const struct sunhv_ops *sunhv_ops = &bychar_ops;
185
186static struct tty_port *receive_chars(struct uart_port *port)
187{
188 struct tty_port *tport = NULL;
189
190 if (port->state != NULL) /* Unopened serial console */
191 tport = &port->state->port;
192
193 if (sunhv_ops->receive_chars(port))
194 sun_do_break();
195
196 return tport;
197}
198
199static void transmit_chars(struct uart_port *port)
200{
201 struct circ_buf *xmit;
202
203 if (!port->state)
204 return;
205
206 xmit = &port->state->xmit;
207 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
208 return;
209
210 sunhv_ops->transmit_chars(port, xmit);
211
212 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
213 uart_write_wakeup(port);
214}
215
216static irqreturn_t sunhv_interrupt(int irq, void *dev_id)
217{
218 struct uart_port *port = dev_id;
219 struct tty_port *tport;
220 unsigned long flags;
221
222 spin_lock_irqsave(&port->lock, flags);
223 tport = receive_chars(port);
224 transmit_chars(port);
225 spin_unlock_irqrestore(&port->lock, flags);
226
227 if (tport)
228 tty_flip_buffer_push(tport);
229
230 return IRQ_HANDLED;
231}
232
233/* port->lock is not held. */
234static unsigned int sunhv_tx_empty(struct uart_port *port)
235{
236 /* Transmitter is always empty for us. If the circ buffer
237 * is non-empty or there is an x_char pending, our caller
238 * will do the right thing and ignore what we return here.
239 */
240 return TIOCSER_TEMT;
241}
242
243/* port->lock held by caller. */
244static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl)
245{
246 return;
247}
248
249/* port->lock is held by caller and interrupts are disabled. */
250static unsigned int sunhv_get_mctrl(struct uart_port *port)
251{
252 return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
253}
254
255/* port->lock held by caller. */
256static void sunhv_stop_tx(struct uart_port *port)
257{
258 return;
259}
260
261/* port->lock held by caller. */
262static void sunhv_start_tx(struct uart_port *port)
263{
264 transmit_chars(port);
265}
266
267/* port->lock is not held. */
268static void sunhv_send_xchar(struct uart_port *port, char ch)
269{
270 unsigned long flags;
271 int limit = 10000;
272
273 if (ch == __DISABLED_CHAR)
274 return;
275
276 spin_lock_irqsave(&port->lock, flags);
277
278 while (limit-- > 0) {
279 long status = sun4v_con_putchar(ch);
280 if (status == HV_EOK)
281 break;
282 udelay(1);
283 }
284
285 spin_unlock_irqrestore(&port->lock, flags);
286}
287
288/* port->lock held by caller. */
289static void sunhv_stop_rx(struct uart_port *port)
290{
291}
292
293/* port->lock is not held. */
294static void sunhv_break_ctl(struct uart_port *port, int break_state)
295{
296 if (break_state) {
297 unsigned long flags;
298 int limit = 10000;
299
300 spin_lock_irqsave(&port->lock, flags);
301
302 while (limit-- > 0) {
303 long status = sun4v_con_putchar(CON_BREAK);
304 if (status == HV_EOK)
305 break;
306 udelay(1);
307 }
308
309 spin_unlock_irqrestore(&port->lock, flags);
310 }
311}
312
313/* port->lock is not held. */
314static int sunhv_startup(struct uart_port *port)
315{
316 return 0;
317}
318
319/* port->lock is not held. */
320static void sunhv_shutdown(struct uart_port *port)
321{
322}
323
324/* port->lock is not held. */
325static void sunhv_set_termios(struct uart_port *port, struct ktermios *termios,
326 struct ktermios *old)
327{
328 unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
329 unsigned int quot = uart_get_divisor(port, baud);
330 unsigned int iflag, cflag;
331 unsigned long flags;
332
333 spin_lock_irqsave(&port->lock, flags);
334
335 iflag = termios->c_iflag;
336 cflag = termios->c_cflag;
337
338 port->ignore_status_mask = 0;
339 if (iflag & IGNBRK)
340 port->ignore_status_mask |= IGNORE_BREAK;
341 if ((cflag & CREAD) == 0)
342 port->ignore_status_mask |= IGNORE_ALL;
343
344 /* XXX */
345 uart_update_timeout(port, cflag,
346 (port->uartclk / (16 * quot)));
347
348 spin_unlock_irqrestore(&port->lock, flags);
349}
350
351static const char *sunhv_type(struct uart_port *port)
352{
353 return "SUN4V HCONS";
354}
355
356static void sunhv_release_port(struct uart_port *port)
357{
358}
359
360static int sunhv_request_port(struct uart_port *port)
361{
362 return 0;
363}
364
365static void sunhv_config_port(struct uart_port *port, int flags)
366{
367}
368
369static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser)
370{
371 return -EINVAL;
372}
373
374static const struct uart_ops sunhv_pops = {
375 .tx_empty = sunhv_tx_empty,
376 .set_mctrl = sunhv_set_mctrl,
377 .get_mctrl = sunhv_get_mctrl,
378 .stop_tx = sunhv_stop_tx,
379 .start_tx = sunhv_start_tx,
380 .send_xchar = sunhv_send_xchar,
381 .stop_rx = sunhv_stop_rx,
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,
395 .driver_name = "sunhv",
396 .dev_name = "ttyHV",
397 .major = TTY_MAJOR,
398};
399
400static struct uart_port *sunhv_port;
401
402void sunhv_migrate_hvcons_irq(int cpu)
403{
404 /* Migrate hvcons irq to param cpu */
405 irq_force_affinity(sunhv_port->irq, cpumask_of(cpu));
406}
407
408/* Copy 's' into the con_write_page, decoding "\n" into
409 * "\r\n" along the way. We have to return two lengths
410 * because the caller needs to know how much to advance
411 * 's' and also how many bytes to output via con_write_page.
412 */
413static int fill_con_write_page(const char *s, unsigned int n,
414 unsigned long *page_bytes)
415{
416 const char *orig_s = s;
417 char *p = con_write_page;
418 int left = PAGE_SIZE;
419
420 while (n--) {
421 if (*s == '\n') {
422 if (left < 2)
423 break;
424 *p++ = '\r';
425 left--;
426 } else if (left < 1)
427 break;
428 *p++ = *s++;
429 left--;
430 }
431 *page_bytes = p - con_write_page;
432 return s - orig_s;
433}
434
435static void sunhv_console_write_paged(struct console *con, const char *s, unsigned n)
436{
437 struct uart_port *port = sunhv_port;
438 unsigned long flags;
439 int locked = 1;
440
441 if (port->sysrq || oops_in_progress)
442 locked = spin_trylock_irqsave(&port->lock, flags);
443 else
444 spin_lock_irqsave(&port->lock, flags);
445
446 while (n > 0) {
447 unsigned long ra = __pa(con_write_page);
448 unsigned long page_bytes;
449 unsigned int cpy = fill_con_write_page(s, n,
450 &page_bytes);
451
452 n -= cpy;
453 s += cpy;
454 while (page_bytes > 0) {
455 unsigned long written;
456 int limit = 1000000;
457
458 while (limit--) {
459 unsigned long stat;
460
461 stat = sun4v_con_write(ra, page_bytes,
462 &written);
463 if (stat == HV_EOK)
464 break;
465 udelay(1);
466 }
467 if (limit < 0)
468 break;
469 page_bytes -= written;
470 ra += written;
471 }
472 }
473
474 if (locked)
475 spin_unlock_irqrestore(&port->lock, flags);
476}
477
478static inline void sunhv_console_putchar(struct uart_port *port, char c)
479{
480 int limit = 1000000;
481
482 while (limit-- > 0) {
483 long status = sun4v_con_putchar(c);
484 if (status == HV_EOK)
485 break;
486 udelay(1);
487 }
488}
489
490static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n)
491{
492 struct uart_port *port = sunhv_port;
493 unsigned long flags;
494 int i, locked = 1;
495
496 if (port->sysrq || oops_in_progress)
497 locked = spin_trylock_irqsave(&port->lock, flags);
498 else
499 spin_lock_irqsave(&port->lock, flags);
500
501 for (i = 0; i < n; i++) {
502 if (*s == '\n')
503 sunhv_console_putchar(port, '\r');
504 sunhv_console_putchar(port, *s++);
505 }
506
507 if (locked)
508 spin_unlock_irqrestore(&port->lock, flags);
509}
510
511static struct console sunhv_console = {
512 .name = "ttyHV",
513 .write = sunhv_console_write_bychar,
514 .device = uart_console_device,
515 .flags = CON_PRINTBUFFER,
516 .index = -1,
517 .data = &sunhv_reg,
518};
519
520static int hv_probe(struct platform_device *op)
521{
522 struct uart_port *port;
523 unsigned long minor;
524 int err;
525
526 if (op->archdata.irqs[0] == 0xffffffff)
527 return -ENODEV;
528
529 port = kzalloc(sizeof(struct uart_port), GFP_KERNEL);
530 if (unlikely(!port))
531 return -ENOMEM;
532
533 minor = 1;
534 if (sun4v_hvapi_register(HV_GRP_CORE, 1, &minor) == 0 &&
535 minor >= 1) {
536 err = -ENOMEM;
537 con_write_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
538 if (!con_write_page)
539 goto out_free_port;
540
541 con_read_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
542 if (!con_read_page)
543 goto out_free_con_write_page;
544
545 sunhv_console.write = sunhv_console_write_paged;
546 sunhv_ops = &bywrite_ops;
547 }
548
549 sunhv_port = port;
550
551 port->has_sysrq = 1;
552 port->line = 0;
553 port->ops = &sunhv_pops;
554 port->type = PORT_SUNHV;
555 port->uartclk = ( 29491200 / 16 ); /* arbitrary */
556
557 port->membase = (unsigned char __iomem *) __pa(port);
558
559 port->irq = op->archdata.irqs[0];
560
561 port->dev = &op->dev;
562
563 err = sunserial_register_minors(&sunhv_reg, 1);
564 if (err)
565 goto out_free_con_read_page;
566
567 sunserial_console_match(&sunhv_console, op->dev.of_node,
568 &sunhv_reg, port->line, false);
569
570 err = uart_add_one_port(&sunhv_reg, port);
571 if (err)
572 goto out_unregister_driver;
573
574 err = request_irq(port->irq, sunhv_interrupt, 0, "hvcons", port);
575 if (err)
576 goto out_remove_port;
577
578 platform_set_drvdata(op, port);
579
580 return 0;
581
582out_remove_port:
583 uart_remove_one_port(&sunhv_reg, port);
584
585out_unregister_driver:
586 sunserial_unregister_minors(&sunhv_reg, 1);
587
588out_free_con_read_page:
589 kfree(con_read_page);
590
591out_free_con_write_page:
592 kfree(con_write_page);
593
594out_free_port:
595 kfree(port);
596 sunhv_port = NULL;
597 return err;
598}
599
600static int hv_remove(struct platform_device *dev)
601{
602 struct uart_port *port = platform_get_drvdata(dev);
603
604 free_irq(port->irq, port);
605
606 uart_remove_one_port(&sunhv_reg, port);
607
608 sunserial_unregister_minors(&sunhv_reg, 1);
609 kfree(con_read_page);
610 kfree(con_write_page);
611 kfree(port);
612 sunhv_port = NULL;
613
614 return 0;
615}
616
617static const struct of_device_id hv_match[] = {
618 {
619 .name = "console",
620 .compatible = "qcn",
621 },
622 {
623 .name = "console",
624 .compatible = "SUNW,sun4v-console",
625 },
626 {},
627};
628
629static struct platform_driver hv_driver = {
630 .driver = {
631 .name = "hv",
632 .of_match_table = hv_match,
633 },
634 .probe = hv_probe,
635 .remove = hv_remove,
636};
637
638static int __init sunhv_init(void)
639{
640 if (tlb_type != hypervisor)
641 return -ENODEV;
642
643 return platform_driver_register(&hv_driver);
644}
645device_initcall(sunhv_init);
646
647#if 0 /* ...def MODULE ; never supported as such */
648MODULE_AUTHOR("David S. Miller");
649MODULE_DESCRIPTION("SUN4V Hypervisor console driver");
650MODULE_VERSION("2.0");
651MODULE_LICENSE("GPL");
652#endif
1// SPDX-License-Identifier: GPL-2.0
2/* sunhv.c: Serial driver for SUN4V hypervisor console.
3 *
4 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
5 */
6
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#include <linux/of.h>
21#include <linux/platform_device.h>
22
23#include <asm/hypervisor.h>
24#include <asm/spitfire.h>
25#include <asm/irq.h>
26#include <asm/setup.h>
27
28#include <linux/serial_core.h>
29#include <linux/sunserialcore.h>
30
31#define CON_BREAK ((long)-1)
32#define CON_HUP ((long)-2)
33
34#define IGNORE_BREAK 0x1
35#define IGNORE_ALL 0x2
36
37static char *con_write_page;
38static char *con_read_page;
39
40static int hung_up = 0;
41
42static void transmit_chars_putchar(struct uart_port *port,
43 struct tty_port *tport)
44{
45 unsigned char ch;
46
47 while (kfifo_peek(&tport->xmit_fifo, &ch)) {
48 long status = sun4v_con_putchar(ch);
49
50 if (status != HV_EOK)
51 break;
52
53 uart_xmit_advance(port, 1);
54 }
55}
56
57static void transmit_chars_write(struct uart_port *port, struct tty_port *tport)
58{
59 while (!kfifo_is_empty(&tport->xmit_fifo)) {
60 unsigned long len, ra, status, sent;
61 unsigned char *tail;
62
63 len = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail,
64 UART_XMIT_SIZE);
65 ra = __pa(tail);
66
67 status = sun4v_con_write(ra, len, &sent);
68 if (status != HV_EOK)
69 break;
70 uart_xmit_advance(port, sent);
71 }
72}
73
74static int receive_chars_getchar(struct uart_port *port)
75{
76 int saw_console_brk = 0;
77 int limit = 10000;
78
79 while (limit-- > 0) {
80 long status;
81 long c = sun4v_con_getchar(&status);
82
83 if (status == HV_EWOULDBLOCK)
84 break;
85
86 if (c == CON_BREAK) {
87 if (uart_handle_break(port))
88 continue;
89 saw_console_brk = 1;
90 c = 0;
91 }
92
93 if (c == CON_HUP) {
94 hung_up = 1;
95 uart_handle_dcd_change(port, false);
96 } else if (hung_up) {
97 hung_up = 0;
98 uart_handle_dcd_change(port, true);
99 }
100
101 if (port->state == NULL) {
102 uart_handle_sysrq_char(port, c);
103 continue;
104 }
105
106 port->icount.rx++;
107
108 if (uart_handle_sysrq_char(port, c))
109 continue;
110
111 tty_insert_flip_char(&port->state->port, c, TTY_NORMAL);
112 }
113
114 return saw_console_brk;
115}
116
117static int receive_chars_read(struct uart_port *port)
118{
119 static int saw_console_brk;
120 int limit = 10000;
121
122 while (limit-- > 0) {
123 unsigned long ra = __pa(con_read_page);
124 unsigned long bytes_read, i;
125 long stat = sun4v_con_read(ra, PAGE_SIZE, &bytes_read);
126
127 if (stat != HV_EOK) {
128 bytes_read = 0;
129
130 if (stat == CON_BREAK) {
131 if (saw_console_brk)
132 sun_do_break();
133
134 if (uart_handle_break(port))
135 continue;
136 saw_console_brk = 1;
137 *con_read_page = 0;
138 bytes_read = 1;
139 } else if (stat == CON_HUP) {
140 hung_up = 1;
141 uart_handle_dcd_change(port, false);
142 continue;
143 } else {
144 /* HV_EWOULDBLOCK, etc. */
145 break;
146 }
147 }
148
149 if (hung_up) {
150 hung_up = 0;
151 uart_handle_dcd_change(port, true);
152 }
153
154 if (port->sysrq != 0 && *con_read_page) {
155 for (i = 0; i < bytes_read; i++)
156 uart_handle_sysrq_char(port, con_read_page[i]);
157 saw_console_brk = 0;
158 }
159
160 if (port->state == NULL)
161 continue;
162
163 port->icount.rx += bytes_read;
164
165 tty_insert_flip_string(&port->state->port, con_read_page,
166 bytes_read);
167 }
168
169 return saw_console_brk;
170}
171
172struct sunhv_ops {
173 void (*transmit_chars)(struct uart_port *port, struct tty_port *tport);
174 int (*receive_chars)(struct uart_port *port);
175};
176
177static const struct sunhv_ops bychar_ops = {
178 .transmit_chars = transmit_chars_putchar,
179 .receive_chars = receive_chars_getchar,
180};
181
182static const struct sunhv_ops bywrite_ops = {
183 .transmit_chars = transmit_chars_write,
184 .receive_chars = receive_chars_read,
185};
186
187static const struct sunhv_ops *sunhv_ops = &bychar_ops;
188
189static struct tty_port *receive_chars(struct uart_port *port)
190{
191 struct tty_port *tport = NULL;
192
193 if (port->state != NULL) /* Unopened serial console */
194 tport = &port->state->port;
195
196 if (sunhv_ops->receive_chars(port))
197 sun_do_break();
198
199 return tport;
200}
201
202static void transmit_chars(struct uart_port *port)
203{
204 struct tty_port *tport;
205
206 if (!port->state)
207 return;
208
209 tport = &port->state->port;
210 if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port))
211 return;
212
213 sunhv_ops->transmit_chars(port, tport);
214
215 if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
216 uart_write_wakeup(port);
217}
218
219static irqreturn_t sunhv_interrupt(int irq, void *dev_id)
220{
221 struct uart_port *port = dev_id;
222 struct tty_port *tport;
223 unsigned long flags;
224
225 uart_port_lock_irqsave(port, &flags);
226 tport = receive_chars(port);
227 transmit_chars(port);
228 uart_port_unlock_irqrestore(port, flags);
229
230 if (tport)
231 tty_flip_buffer_push(tport);
232
233 return IRQ_HANDLED;
234}
235
236/* port->lock is not held. */
237static unsigned int sunhv_tx_empty(struct uart_port *port)
238{
239 /* Transmitter is always empty for us. If the circ buffer
240 * is non-empty or there is an x_char pending, our caller
241 * will do the right thing and ignore what we return here.
242 */
243 return TIOCSER_TEMT;
244}
245
246/* port->lock held by caller. */
247static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl)
248{
249 return;
250}
251
252/* port->lock is held by caller and interrupts are disabled. */
253static unsigned int sunhv_get_mctrl(struct uart_port *port)
254{
255 return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
256}
257
258/* port->lock held by caller. */
259static void sunhv_stop_tx(struct uart_port *port)
260{
261 return;
262}
263
264/* port->lock held by caller. */
265static void sunhv_start_tx(struct uart_port *port)
266{
267 transmit_chars(port);
268}
269
270/* port->lock is not held. */
271static void sunhv_send_xchar(struct uart_port *port, char ch)
272{
273 unsigned long flags;
274 int limit = 10000;
275
276 if (ch == __DISABLED_CHAR)
277 return;
278
279 uart_port_lock_irqsave(port, &flags);
280
281 while (limit-- > 0) {
282 long status = sun4v_con_putchar(ch);
283 if (status == HV_EOK)
284 break;
285 udelay(1);
286 }
287
288 uart_port_unlock_irqrestore(port, flags);
289}
290
291/* port->lock held by caller. */
292static void sunhv_stop_rx(struct uart_port *port)
293{
294}
295
296/* port->lock is not held. */
297static void sunhv_break_ctl(struct uart_port *port, int break_state)
298{
299 if (break_state) {
300 unsigned long flags;
301 int limit = 10000;
302
303 uart_port_lock_irqsave(port, &flags);
304
305 while (limit-- > 0) {
306 long status = sun4v_con_putchar(CON_BREAK);
307 if (status == HV_EOK)
308 break;
309 udelay(1);
310 }
311
312 uart_port_unlock_irqrestore(port, flags);
313 }
314}
315
316/* port->lock is not held. */
317static int sunhv_startup(struct uart_port *port)
318{
319 return 0;
320}
321
322/* port->lock is not held. */
323static void sunhv_shutdown(struct uart_port *port)
324{
325}
326
327/* port->lock is not held. */
328static void sunhv_set_termios(struct uart_port *port, struct ktermios *termios,
329 const struct ktermios *old)
330{
331 unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
332 unsigned int quot = uart_get_divisor(port, baud);
333 unsigned int iflag, cflag;
334 unsigned long flags;
335
336 uart_port_lock_irqsave(port, &flags);
337
338 iflag = termios->c_iflag;
339 cflag = termios->c_cflag;
340
341 port->ignore_status_mask = 0;
342 if (iflag & IGNBRK)
343 port->ignore_status_mask |= IGNORE_BREAK;
344 if ((cflag & CREAD) == 0)
345 port->ignore_status_mask |= IGNORE_ALL;
346
347 /* XXX */
348 uart_update_timeout(port, cflag,
349 (port->uartclk / (16 * quot)));
350
351 uart_port_unlock_irqrestore(port, flags);
352}
353
354static const char *sunhv_type(struct uart_port *port)
355{
356 return "SUN4V HCONS";
357}
358
359static void sunhv_release_port(struct uart_port *port)
360{
361}
362
363static int sunhv_request_port(struct uart_port *port)
364{
365 return 0;
366}
367
368static void sunhv_config_port(struct uart_port *port, int flags)
369{
370}
371
372static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser)
373{
374 return -EINVAL;
375}
376
377static const struct uart_ops sunhv_pops = {
378 .tx_empty = sunhv_tx_empty,
379 .set_mctrl = sunhv_set_mctrl,
380 .get_mctrl = sunhv_get_mctrl,
381 .stop_tx = sunhv_stop_tx,
382 .start_tx = sunhv_start_tx,
383 .send_xchar = sunhv_send_xchar,
384 .stop_rx = sunhv_stop_rx,
385 .break_ctl = sunhv_break_ctl,
386 .startup = sunhv_startup,
387 .shutdown = sunhv_shutdown,
388 .set_termios = sunhv_set_termios,
389 .type = sunhv_type,
390 .release_port = sunhv_release_port,
391 .request_port = sunhv_request_port,
392 .config_port = sunhv_config_port,
393 .verify_port = sunhv_verify_port,
394};
395
396static struct uart_driver sunhv_reg = {
397 .owner = THIS_MODULE,
398 .driver_name = "sunhv",
399 .dev_name = "ttyHV",
400 .major = TTY_MAJOR,
401};
402
403static struct uart_port *sunhv_port;
404
405void sunhv_migrate_hvcons_irq(int cpu)
406{
407 /* Migrate hvcons irq to param cpu */
408 irq_force_affinity(sunhv_port->irq, cpumask_of(cpu));
409}
410
411/* Copy 's' into the con_write_page, decoding "\n" into
412 * "\r\n" along the way. We have to return two lengths
413 * because the caller needs to know how much to advance
414 * 's' and also how many bytes to output via con_write_page.
415 */
416static int fill_con_write_page(const char *s, unsigned int n,
417 unsigned long *page_bytes)
418{
419 const char *orig_s = s;
420 char *p = con_write_page;
421 int left = PAGE_SIZE;
422
423 while (n--) {
424 if (*s == '\n') {
425 if (left < 2)
426 break;
427 *p++ = '\r';
428 left--;
429 } else if (left < 1)
430 break;
431 *p++ = *s++;
432 left--;
433 }
434 *page_bytes = p - con_write_page;
435 return s - orig_s;
436}
437
438static void sunhv_console_write_paged(struct console *con, const char *s, unsigned n)
439{
440 struct uart_port *port = sunhv_port;
441 unsigned long flags;
442 int locked = 1;
443
444 if (port->sysrq || oops_in_progress)
445 locked = uart_port_trylock_irqsave(port, &flags);
446 else
447 uart_port_lock_irqsave(port, &flags);
448
449 while (n > 0) {
450 unsigned long ra = __pa(con_write_page);
451 unsigned long page_bytes;
452 unsigned int cpy = fill_con_write_page(s, n,
453 &page_bytes);
454
455 n -= cpy;
456 s += cpy;
457 while (page_bytes > 0) {
458 unsigned long written;
459 int limit = 1000000;
460
461 while (limit--) {
462 unsigned long stat;
463
464 stat = sun4v_con_write(ra, page_bytes,
465 &written);
466 if (stat == HV_EOK)
467 break;
468 udelay(1);
469 }
470 if (limit < 0)
471 break;
472 page_bytes -= written;
473 ra += written;
474 }
475 }
476
477 if (locked)
478 uart_port_unlock_irqrestore(port, flags);
479}
480
481static inline void sunhv_console_putchar(struct uart_port *port, char c)
482{
483 int limit = 1000000;
484
485 while (limit-- > 0) {
486 long status = sun4v_con_putchar(c);
487 if (status == HV_EOK)
488 break;
489 udelay(1);
490 }
491}
492
493static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n)
494{
495 struct uart_port *port = sunhv_port;
496 unsigned long flags;
497 int i, locked = 1;
498
499 if (port->sysrq || oops_in_progress)
500 locked = uart_port_trylock_irqsave(port, &flags);
501 else
502 uart_port_lock_irqsave(port, &flags);
503
504 for (i = 0; i < n; i++) {
505 if (*s == '\n')
506 sunhv_console_putchar(port, '\r');
507 sunhv_console_putchar(port, *s++);
508 }
509
510 if (locked)
511 uart_port_unlock_irqrestore(port, flags);
512}
513
514static struct console sunhv_console = {
515 .name = "ttyHV",
516 .write = sunhv_console_write_bychar,
517 .device = uart_console_device,
518 .flags = CON_PRINTBUFFER,
519 .index = -1,
520 .data = &sunhv_reg,
521};
522
523static int hv_probe(struct platform_device *op)
524{
525 struct uart_port *port;
526 unsigned long minor;
527 int err;
528
529 if (op->archdata.irqs[0] == 0xffffffff)
530 return -ENODEV;
531
532 port = kzalloc(sizeof(struct uart_port), GFP_KERNEL);
533 if (unlikely(!port))
534 return -ENOMEM;
535
536 minor = 1;
537 if (sun4v_hvapi_register(HV_GRP_CORE, 1, &minor) == 0 &&
538 minor >= 1) {
539 err = -ENOMEM;
540 con_write_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
541 if (!con_write_page)
542 goto out_free_port;
543
544 con_read_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
545 if (!con_read_page)
546 goto out_free_con_write_page;
547
548 sunhv_console.write = sunhv_console_write_paged;
549 sunhv_ops = &bywrite_ops;
550 }
551
552 sunhv_port = port;
553
554 port->has_sysrq = 1;
555 port->line = 0;
556 port->ops = &sunhv_pops;
557 port->type = PORT_SUNHV;
558 port->uartclk = ( 29491200 / 16 ); /* arbitrary */
559
560 port->membase = (unsigned char __iomem *) __pa(port);
561
562 port->irq = op->archdata.irqs[0];
563
564 port->dev = &op->dev;
565
566 err = sunserial_register_minors(&sunhv_reg, 1);
567 if (err)
568 goto out_free_con_read_page;
569
570 sunserial_console_match(&sunhv_console, op->dev.of_node,
571 &sunhv_reg, port->line, false);
572
573 err = uart_add_one_port(&sunhv_reg, port);
574 if (err)
575 goto out_unregister_driver;
576
577 err = request_irq(port->irq, sunhv_interrupt, 0, "hvcons", port);
578 if (err)
579 goto out_remove_port;
580
581 platform_set_drvdata(op, port);
582
583 return 0;
584
585out_remove_port:
586 uart_remove_one_port(&sunhv_reg, port);
587
588out_unregister_driver:
589 sunserial_unregister_minors(&sunhv_reg, 1);
590
591out_free_con_read_page:
592 kfree(con_read_page);
593
594out_free_con_write_page:
595 kfree(con_write_page);
596
597out_free_port:
598 kfree(port);
599 sunhv_port = NULL;
600 return err;
601}
602
603static void hv_remove(struct platform_device *dev)
604{
605 struct uart_port *port = platform_get_drvdata(dev);
606
607 free_irq(port->irq, port);
608
609 uart_remove_one_port(&sunhv_reg, port);
610
611 sunserial_unregister_minors(&sunhv_reg, 1);
612 kfree(con_read_page);
613 kfree(con_write_page);
614 kfree(port);
615 sunhv_port = NULL;
616}
617
618static const struct of_device_id hv_match[] = {
619 {
620 .name = "console",
621 .compatible = "qcn",
622 },
623 {
624 .name = "console",
625 .compatible = "SUNW,sun4v-console",
626 },
627 {},
628};
629
630static struct platform_driver hv_driver = {
631 .driver = {
632 .name = "hv",
633 .of_match_table = hv_match,
634 },
635 .probe = hv_probe,
636 .remove = hv_remove,
637};
638
639static int __init sunhv_init(void)
640{
641 if (tlb_type != hypervisor)
642 return -ENODEV;
643
644 return platform_driver_register(&hv_driver);
645}
646device_initcall(sunhv_init);
647
648#if 0 /* ...def MODULE ; never supported as such */
649MODULE_AUTHOR("David S. Miller");
650MODULE_DESCRIPTION("SUN4V Hypervisor console driver");
651MODULE_VERSION("2.0");
652MODULE_LICENSE("GPL");
653#endif