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1/*
2 * vio driver interface to hvc_console.c
3 *
4 * This code was moved here to allow the remaining code to be reused as a
5 * generic polling mode with semi-reliable transport driver core to the
6 * console and tty subsystems.
7 *
8 *
9 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
10 * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
11 * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
12 * Copyright (C) 2004 IBM Corporation
13 *
14 * Additional Author(s):
15 * Ryan S. Arnold <rsa@us.ibm.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 *
31 * TODO:
32 *
33 * - handle error in sending hvsi protocol packets
34 * - retry nego on subsequent sends ?
35 */
36
37#undef DEBUG
38
39#include <linux/types.h>
40#include <linux/init.h>
41#include <linux/delay.h>
42#include <linux/slab.h>
43#include <linux/console.h>
44
45#include <asm/hvconsole.h>
46#include <asm/vio.h>
47#include <asm/prom.h>
48#include <asm/firmware.h>
49#include <asm/hvsi.h>
50#include <asm/udbg.h>
51
52#include "hvc_console.h"
53
54static const char hvc_driver_name[] = "hvc_console";
55
56static struct vio_device_id hvc_driver_table[] __devinitdata = {
57 {"serial", "hvterm1"},
58#ifndef HVC_OLD_HVSI
59 {"serial", "hvterm-protocol"},
60#endif
61 { "", "" }
62};
63MODULE_DEVICE_TABLE(vio, hvc_driver_table);
64
65typedef enum hv_protocol {
66 HV_PROTOCOL_RAW,
67 HV_PROTOCOL_HVSI
68} hv_protocol_t;
69
70struct hvterm_priv {
71 u32 termno; /* HV term number */
72 hv_protocol_t proto; /* Raw data or HVSI packets */
73 struct hvsi_priv hvsi; /* HVSI specific data */
74 spinlock_t buf_lock;
75 char buf[SIZE_VIO_GET_CHARS];
76 int left;
77 int offset;
78};
79static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES];
80/* For early boot console */
81static struct hvterm_priv hvterm_priv0;
82
83static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count)
84{
85 struct hvterm_priv *pv = hvterm_privs[vtermno];
86 unsigned long i;
87 unsigned long flags;
88 int got;
89
90 if (WARN_ON(!pv))
91 return 0;
92
93 spin_lock_irqsave(&pv->buf_lock, flags);
94
95 if (pv->left == 0) {
96 pv->offset = 0;
97 pv->left = hvc_get_chars(pv->termno, pv->buf, count);
98
99 /*
100 * Work around a HV bug where it gives us a null
101 * after every \r. -- paulus
102 */
103 for (i = 1; i < pv->left; ++i) {
104 if (pv->buf[i] == 0 && pv->buf[i-1] == '\r') {
105 --pv->left;
106 if (i < pv->left) {
107 memmove(&pv->buf[i], &pv->buf[i+1],
108 pv->left - i);
109 }
110 }
111 }
112 }
113
114 got = min(count, pv->left);
115 memcpy(buf, &pv->buf[pv->offset], got);
116 pv->offset += got;
117 pv->left -= got;
118
119 spin_unlock_irqrestore(&pv->buf_lock, flags);
120
121 return got;
122}
123
124static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count)
125{
126 struct hvterm_priv *pv = hvterm_privs[vtermno];
127
128 if (WARN_ON(!pv))
129 return 0;
130
131 return hvc_put_chars(pv->termno, buf, count);
132}
133
134static const struct hv_ops hvterm_raw_ops = {
135 .get_chars = hvterm_raw_get_chars,
136 .put_chars = hvterm_raw_put_chars,
137 .notifier_add = notifier_add_irq,
138 .notifier_del = notifier_del_irq,
139 .notifier_hangup = notifier_hangup_irq,
140};
141
142static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
143{
144 struct hvterm_priv *pv = hvterm_privs[vtermno];
145
146 if (WARN_ON(!pv))
147 return 0;
148
149 return hvsilib_get_chars(&pv->hvsi, buf, count);
150}
151
152static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
153{
154 struct hvterm_priv *pv = hvterm_privs[vtermno];
155
156 if (WARN_ON(!pv))
157 return 0;
158
159 return hvsilib_put_chars(&pv->hvsi, buf, count);
160}
161
162static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
163{
164 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
165 int rc;
166
167 pr_devel("HVSI@%x: open !\n", pv->termno);
168
169 rc = notifier_add_irq(hp, data);
170 if (rc)
171 return rc;
172
173 return hvsilib_open(&pv->hvsi, hp);
174}
175
176static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
177{
178 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
179
180 pr_devel("HVSI@%x: do close !\n", pv->termno);
181
182 hvsilib_close(&pv->hvsi, hp);
183
184 notifier_del_irq(hp, data);
185}
186
187void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
188{
189 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
190
191 pr_devel("HVSI@%x: do hangup !\n", pv->termno);
192
193 hvsilib_close(&pv->hvsi, hp);
194
195 notifier_hangup_irq(hp, data);
196}
197
198static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
199{
200 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
201
202 if (!pv)
203 return -EINVAL;
204 return pv->hvsi.mctrl;
205}
206
207static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
208 unsigned int clear)
209{
210 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
211
212 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
213 pv->termno, set, clear);
214
215 if (set & TIOCM_DTR)
216 hvsilib_write_mctrl(&pv->hvsi, 1);
217 else if (clear & TIOCM_DTR)
218 hvsilib_write_mctrl(&pv->hvsi, 0);
219
220 return 0;
221}
222
223static const struct hv_ops hvterm_hvsi_ops = {
224 .get_chars = hvterm_hvsi_get_chars,
225 .put_chars = hvterm_hvsi_put_chars,
226 .notifier_add = hvterm_hvsi_open,
227 .notifier_del = hvterm_hvsi_close,
228 .notifier_hangup = hvterm_hvsi_hangup,
229 .tiocmget = hvterm_hvsi_tiocmget,
230 .tiocmset = hvterm_hvsi_tiocmset,
231};
232
233static int __devinit hvc_vio_probe(struct vio_dev *vdev,
234 const struct vio_device_id *id)
235{
236 const struct hv_ops *ops;
237 struct hvc_struct *hp;
238 struct hvterm_priv *pv;
239 hv_protocol_t proto;
240 int i, termno = -1;
241
242 /* probed with invalid parameters. */
243 if (!vdev || !id)
244 return -EPERM;
245
246 if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
247 proto = HV_PROTOCOL_RAW;
248 ops = &hvterm_raw_ops;
249 } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
250 proto = HV_PROTOCOL_HVSI;
251 ops = &hvterm_hvsi_ops;
252 } else {
253 pr_err("hvc_vio: Unkown protocol for %s\n", vdev->dev.of_node->full_name);
254 return -ENXIO;
255 }
256
257 pr_devel("hvc_vio_probe() device %s, using %s protocol\n",
258 vdev->dev.of_node->full_name,
259 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
260
261 /* Is it our boot one ? */
262 if (hvterm_privs[0] == &hvterm_priv0 &&
263 vdev->unit_address == hvterm_priv0.termno) {
264 pv = hvterm_privs[0];
265 termno = 0;
266 pr_devel("->boot console, using termno 0\n");
267 }
268 /* nope, allocate a new one */
269 else {
270 for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
271 if (!hvterm_privs[i])
272 termno = i;
273 pr_devel("->non-boot console, using termno %d\n", termno);
274 if (termno < 0)
275 return -ENODEV;
276 pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
277 if (!pv)
278 return -ENOMEM;
279 pv->termno = vdev->unit_address;
280 pv->proto = proto;
281 spin_lock_init(&pv->buf_lock);
282 hvterm_privs[termno] = pv;
283 hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
284 pv->termno, 0);
285 }
286
287 hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
288 if (IS_ERR(hp))
289 return PTR_ERR(hp);
290 dev_set_drvdata(&vdev->dev, hp);
291
292 return 0;
293}
294
295static int __devexit hvc_vio_remove(struct vio_dev *vdev)
296{
297 struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
298 int rc, termno;
299
300 termno = hp->vtermno;
301 rc = hvc_remove(hp);
302 if (rc == 0) {
303 if (hvterm_privs[termno] != &hvterm_priv0)
304 kfree(hvterm_privs[termno]);
305 hvterm_privs[termno] = NULL;
306 }
307 return rc;
308}
309
310static struct vio_driver hvc_vio_driver = {
311 .id_table = hvc_driver_table,
312 .probe = hvc_vio_probe,
313 .remove = __devexit_p(hvc_vio_remove),
314 .driver = {
315 .name = hvc_driver_name,
316 .owner = THIS_MODULE,
317 }
318};
319
320static int __init hvc_vio_init(void)
321{
322 int rc;
323
324 if (firmware_has_feature(FW_FEATURE_ISERIES))
325 return -EIO;
326
327 /* Register as a vio device to receive callbacks */
328 rc = vio_register_driver(&hvc_vio_driver);
329
330 return rc;
331}
332module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
333
334static void __exit hvc_vio_exit(void)
335{
336 vio_unregister_driver(&hvc_vio_driver);
337}
338module_exit(hvc_vio_exit);
339
340static void udbg_hvc_putc(char c)
341{
342 int count = -1;
343
344 if (c == '\n')
345 udbg_hvc_putc('\r');
346
347 do {
348 switch(hvterm_priv0.proto) {
349 case HV_PROTOCOL_RAW:
350 count = hvterm_raw_put_chars(0, &c, 1);
351 break;
352 case HV_PROTOCOL_HVSI:
353 count = hvterm_hvsi_put_chars(0, &c, 1);
354 break;
355 }
356 } while(count == 0);
357}
358
359static int udbg_hvc_getc_poll(void)
360{
361 int rc = 0;
362 char c;
363
364 switch(hvterm_priv0.proto) {
365 case HV_PROTOCOL_RAW:
366 rc = hvterm_raw_get_chars(0, &c, 1);
367 break;
368 case HV_PROTOCOL_HVSI:
369 rc = hvterm_hvsi_get_chars(0, &c, 1);
370 break;
371 }
372 if (!rc)
373 return -1;
374 return c;
375}
376
377static int udbg_hvc_getc(void)
378{
379 int ch;
380 for (;;) {
381 ch = udbg_hvc_getc_poll();
382 if (ch == -1) {
383 /* This shouldn't be needed...but... */
384 volatile unsigned long delay;
385 for (delay=0; delay < 2000000; delay++)
386 ;
387 } else {
388 return ch;
389 }
390 }
391}
392
393void __init hvc_vio_init_early(void)
394{
395 struct device_node *stdout_node;
396 const u32 *termno;
397 const char *name;
398 const struct hv_ops *ops;
399
400 /* find the boot console from /chosen/stdout */
401 if (!of_chosen)
402 return;
403 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
404 if (name == NULL)
405 return;
406 stdout_node = of_find_node_by_path(name);
407 if (!stdout_node)
408 return;
409 name = of_get_property(stdout_node, "name", NULL);
410 if (!name) {
411 printk(KERN_WARNING "stdout node missing 'name' property!\n");
412 goto out;
413 }
414
415 /* Check if it's a virtual terminal */
416 if (strncmp(name, "vty", 3) != 0)
417 goto out;
418 termno = of_get_property(stdout_node, "reg", NULL);
419 if (termno == NULL)
420 goto out;
421 hvterm_priv0.termno = *termno;
422 spin_lock_init(&hvterm_priv0.buf_lock);
423 hvterm_privs[0] = &hvterm_priv0;
424
425 /* Check the protocol */
426 if (of_device_is_compatible(stdout_node, "hvterm1")) {
427 hvterm_priv0.proto = HV_PROTOCOL_RAW;
428 ops = &hvterm_raw_ops;
429 }
430 else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
431 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
432 ops = &hvterm_hvsi_ops;
433 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
434 hvterm_priv0.termno, 1);
435 /* HVSI, perform the handshake now */
436 hvsilib_establish(&hvterm_priv0.hvsi);
437 } else
438 goto out;
439 udbg_putc = udbg_hvc_putc;
440 udbg_getc = udbg_hvc_getc;
441 udbg_getc_poll = udbg_hvc_getc_poll;
442#ifdef HVC_OLD_HVSI
443 /* When using the old HVSI driver don't register the HVC
444 * backend for HVSI, only do udbg
445 */
446 if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
447 goto out;
448#endif
449 add_preferred_console("hvc", 0, NULL);
450 hvc_instantiate(0, 0, ops);
451out:
452 of_node_put(stdout_node);
453}
454
455/* call this from early_init() for a working debug console on
456 * vterm capable LPAR machines
457 */
458#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
459void __init udbg_init_debug_lpar(void)
460{
461 hvterm_privs[0] = &hvterm_priv0;
462 hvterm_priv0.termno = 0;
463 hvterm_priv0.proto = HV_PROTOCOL_RAW;
464 spin_lock_init(&hvterm_priv0.buf_lock);
465 udbg_putc = udbg_hvc_putc;
466 udbg_getc = udbg_hvc_getc;
467 udbg_getc_poll = udbg_hvc_getc_poll;
468}
469#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */
470
471#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI
472void __init udbg_init_debug_lpar_hvsi(void)
473{
474 hvterm_privs[0] = &hvterm_priv0;
475 hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
476 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
477 spin_lock_init(&hvterm_priv0.buf_lock);
478 udbg_putc = udbg_hvc_putc;
479 udbg_getc = udbg_hvc_getc;
480 udbg_getc_poll = udbg_hvc_getc_poll;
481 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
482 hvterm_priv0.termno, 1);
483 hvsilib_establish(&hvterm_priv0.hvsi);
484}
485#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * vio driver interface to hvc_console.c
4 *
5 * This code was moved here to allow the remaining code to be reused as a
6 * generic polling mode with semi-reliable transport driver core to the
7 * console and tty subsystems.
8 *
9 *
10 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
11 * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
12 * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
13 * Copyright (C) 2004 IBM Corporation
14 *
15 * Additional Author(s):
16 * Ryan S. Arnold <rsa@us.ibm.com>
17 *
18 * TODO:
19 *
20 * - handle error in sending hvsi protocol packets
21 * - retry nego on subsequent sends ?
22 */
23
24#undef DEBUG
25
26#include <linux/types.h>
27#include <linux/init.h>
28#include <linux/delay.h>
29#include <linux/slab.h>
30#include <linux/console.h>
31
32#include <asm/hvconsole.h>
33#include <asm/vio.h>
34#include <asm/prom.h>
35#include <asm/hvsi.h>
36#include <asm/udbg.h>
37#include <asm/machdep.h>
38
39#include "hvc_console.h"
40
41static const char hvc_driver_name[] = "hvc_console";
42
43static const struct vio_device_id hvc_driver_table[] = {
44 {"serial", "hvterm1"},
45#ifndef HVC_OLD_HVSI
46 {"serial", "hvterm-protocol"},
47#endif
48 { "", "" }
49};
50
51typedef enum hv_protocol {
52 HV_PROTOCOL_RAW,
53 HV_PROTOCOL_HVSI
54} hv_protocol_t;
55
56struct hvterm_priv {
57 u32 termno; /* HV term number */
58 hv_protocol_t proto; /* Raw data or HVSI packets */
59 struct hvsi_priv hvsi; /* HVSI specific data */
60 spinlock_t buf_lock;
61 char buf[SIZE_VIO_GET_CHARS];
62 int left;
63 int offset;
64};
65static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES];
66/* For early boot console */
67static struct hvterm_priv hvterm_priv0;
68
69static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count)
70{
71 struct hvterm_priv *pv = hvterm_privs[vtermno];
72 unsigned long i;
73 unsigned long flags;
74 int got;
75
76 if (WARN_ON(!pv))
77 return 0;
78
79 spin_lock_irqsave(&pv->buf_lock, flags);
80
81 if (pv->left == 0) {
82 pv->offset = 0;
83 pv->left = hvc_get_chars(pv->termno, pv->buf, count);
84
85 /*
86 * Work around a HV bug where it gives us a null
87 * after every \r. -- paulus
88 */
89 for (i = 1; i < pv->left; ++i) {
90 if (pv->buf[i] == 0 && pv->buf[i-1] == '\r') {
91 --pv->left;
92 if (i < pv->left) {
93 memmove(&pv->buf[i], &pv->buf[i+1],
94 pv->left - i);
95 }
96 }
97 }
98 }
99
100 got = min(count, pv->left);
101 memcpy(buf, &pv->buf[pv->offset], got);
102 pv->offset += got;
103 pv->left -= got;
104
105 spin_unlock_irqrestore(&pv->buf_lock, flags);
106
107 return got;
108}
109
110static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count)
111{
112 struct hvterm_priv *pv = hvterm_privs[vtermno];
113
114 if (WARN_ON(!pv))
115 return 0;
116
117 return hvc_put_chars(pv->termno, buf, count);
118}
119
120static const struct hv_ops hvterm_raw_ops = {
121 .get_chars = hvterm_raw_get_chars,
122 .put_chars = hvterm_raw_put_chars,
123 .notifier_add = notifier_add_irq,
124 .notifier_del = notifier_del_irq,
125 .notifier_hangup = notifier_hangup_irq,
126};
127
128static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
129{
130 struct hvterm_priv *pv = hvterm_privs[vtermno];
131
132 if (WARN_ON(!pv))
133 return 0;
134
135 return hvsilib_get_chars(&pv->hvsi, buf, count);
136}
137
138static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
139{
140 struct hvterm_priv *pv = hvterm_privs[vtermno];
141
142 if (WARN_ON(!pv))
143 return 0;
144
145 return hvsilib_put_chars(&pv->hvsi, buf, count);
146}
147
148static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
149{
150 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
151 int rc;
152
153 pr_devel("HVSI@%x: open !\n", pv->termno);
154
155 rc = notifier_add_irq(hp, data);
156 if (rc)
157 return rc;
158
159 return hvsilib_open(&pv->hvsi, hp);
160}
161
162static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
163{
164 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
165
166 pr_devel("HVSI@%x: do close !\n", pv->termno);
167
168 hvsilib_close(&pv->hvsi, hp);
169
170 notifier_del_irq(hp, data);
171}
172
173void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
174{
175 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
176
177 pr_devel("HVSI@%x: do hangup !\n", pv->termno);
178
179 hvsilib_close(&pv->hvsi, hp);
180
181 notifier_hangup_irq(hp, data);
182}
183
184static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
185{
186 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
187
188 if (!pv)
189 return -EINVAL;
190 return pv->hvsi.mctrl;
191}
192
193static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
194 unsigned int clear)
195{
196 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
197
198 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
199 pv->termno, set, clear);
200
201 if (set & TIOCM_DTR)
202 hvsilib_write_mctrl(&pv->hvsi, 1);
203 else if (clear & TIOCM_DTR)
204 hvsilib_write_mctrl(&pv->hvsi, 0);
205
206 return 0;
207}
208
209static const struct hv_ops hvterm_hvsi_ops = {
210 .get_chars = hvterm_hvsi_get_chars,
211 .put_chars = hvterm_hvsi_put_chars,
212 .notifier_add = hvterm_hvsi_open,
213 .notifier_del = hvterm_hvsi_close,
214 .notifier_hangup = hvterm_hvsi_hangup,
215 .tiocmget = hvterm_hvsi_tiocmget,
216 .tiocmset = hvterm_hvsi_tiocmset,
217};
218
219static void udbg_hvc_putc(char c)
220{
221 int count = -1;
222
223 if (!hvterm_privs[0])
224 return;
225
226 if (c == '\n')
227 udbg_hvc_putc('\r');
228
229 do {
230 switch(hvterm_privs[0]->proto) {
231 case HV_PROTOCOL_RAW:
232 count = hvterm_raw_put_chars(0, &c, 1);
233 break;
234 case HV_PROTOCOL_HVSI:
235 count = hvterm_hvsi_put_chars(0, &c, 1);
236 break;
237 }
238 } while(count == 0);
239}
240
241static int udbg_hvc_getc_poll(void)
242{
243 int rc = 0;
244 char c;
245
246 if (!hvterm_privs[0])
247 return -1;
248
249 switch(hvterm_privs[0]->proto) {
250 case HV_PROTOCOL_RAW:
251 rc = hvterm_raw_get_chars(0, &c, 1);
252 break;
253 case HV_PROTOCOL_HVSI:
254 rc = hvterm_hvsi_get_chars(0, &c, 1);
255 break;
256 }
257 if (!rc)
258 return -1;
259 return c;
260}
261
262static int udbg_hvc_getc(void)
263{
264 int ch;
265
266 if (!hvterm_privs[0])
267 return -1;
268
269 for (;;) {
270 ch = udbg_hvc_getc_poll();
271 if (ch == -1) {
272 /* This shouldn't be needed...but... */
273 volatile unsigned long delay;
274 for (delay=0; delay < 2000000; delay++)
275 ;
276 } else {
277 return ch;
278 }
279 }
280}
281
282static int hvc_vio_probe(struct vio_dev *vdev,
283 const struct vio_device_id *id)
284{
285 const struct hv_ops *ops;
286 struct hvc_struct *hp;
287 struct hvterm_priv *pv;
288 hv_protocol_t proto;
289 int i, termno = -1;
290
291 /* probed with invalid parameters. */
292 if (!vdev || !id)
293 return -EPERM;
294
295 if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
296 proto = HV_PROTOCOL_RAW;
297 ops = &hvterm_raw_ops;
298 } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
299 proto = HV_PROTOCOL_HVSI;
300 ops = &hvterm_hvsi_ops;
301 } else {
302 pr_err("hvc_vio: Unknown protocol for %pOF\n", vdev->dev.of_node);
303 return -ENXIO;
304 }
305
306 pr_devel("hvc_vio_probe() device %pOF, using %s protocol\n",
307 vdev->dev.of_node,
308 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
309
310 /* Is it our boot one ? */
311 if (hvterm_privs[0] == &hvterm_priv0 &&
312 vdev->unit_address == hvterm_priv0.termno) {
313 pv = hvterm_privs[0];
314 termno = 0;
315 pr_devel("->boot console, using termno 0\n");
316 }
317 /* nope, allocate a new one */
318 else {
319 for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
320 if (!hvterm_privs[i])
321 termno = i;
322 pr_devel("->non-boot console, using termno %d\n", termno);
323 if (termno < 0)
324 return -ENODEV;
325 pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
326 if (!pv)
327 return -ENOMEM;
328 pv->termno = vdev->unit_address;
329 pv->proto = proto;
330 spin_lock_init(&pv->buf_lock);
331 hvterm_privs[termno] = pv;
332 hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
333 pv->termno, 0);
334 }
335
336 hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
337 if (IS_ERR(hp))
338 return PTR_ERR(hp);
339 dev_set_drvdata(&vdev->dev, hp);
340
341 /* register udbg if it's not there already for console 0 */
342 if (hp->index == 0 && !udbg_putc) {
343 udbg_putc = udbg_hvc_putc;
344 udbg_getc = udbg_hvc_getc;
345 udbg_getc_poll = udbg_hvc_getc_poll;
346 }
347
348 return 0;
349}
350
351static struct vio_driver hvc_vio_driver = {
352 .id_table = hvc_driver_table,
353 .probe = hvc_vio_probe,
354 .name = hvc_driver_name,
355 .driver = {
356 .suppress_bind_attrs = true,
357 },
358};
359
360static int __init hvc_vio_init(void)
361{
362 int rc;
363
364 /* Register as a vio device to receive callbacks */
365 rc = vio_register_driver(&hvc_vio_driver);
366
367 return rc;
368}
369device_initcall(hvc_vio_init); /* after drivers/tty/hvc/hvc_console.c */
370
371void __init hvc_vio_init_early(void)
372{
373 const __be32 *termno;
374 const char *name;
375 const struct hv_ops *ops;
376
377 /* find the boot console from /chosen/stdout */
378 if (!of_stdout)
379 return;
380 name = of_get_property(of_stdout, "name", NULL);
381 if (!name) {
382 printk(KERN_WARNING "stdout node missing 'name' property!\n");
383 return;
384 }
385
386 /* Check if it's a virtual terminal */
387 if (strncmp(name, "vty", 3) != 0)
388 return;
389 termno = of_get_property(of_stdout, "reg", NULL);
390 if (termno == NULL)
391 return;
392 hvterm_priv0.termno = of_read_number(termno, 1);
393 spin_lock_init(&hvterm_priv0.buf_lock);
394 hvterm_privs[0] = &hvterm_priv0;
395
396 /* Check the protocol */
397 if (of_device_is_compatible(of_stdout, "hvterm1")) {
398 hvterm_priv0.proto = HV_PROTOCOL_RAW;
399 ops = &hvterm_raw_ops;
400 }
401 else if (of_device_is_compatible(of_stdout, "hvterm-protocol")) {
402 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
403 ops = &hvterm_hvsi_ops;
404 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
405 hvterm_priv0.termno, 1);
406 /* HVSI, perform the handshake now */
407 hvsilib_establish(&hvterm_priv0.hvsi);
408 } else
409 return;
410 udbg_putc = udbg_hvc_putc;
411 udbg_getc = udbg_hvc_getc;
412 udbg_getc_poll = udbg_hvc_getc_poll;
413#ifdef HVC_OLD_HVSI
414 /* When using the old HVSI driver don't register the HVC
415 * backend for HVSI, only do udbg
416 */
417 if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
418 return;
419#endif
420 /* Check whether the user has requested a different console. */
421 if (!strstr(boot_command_line, "console="))
422 add_preferred_console("hvc", 0, NULL);
423 hvc_instantiate(0, 0, ops);
424}
425
426/* call this from early_init() for a working debug console on
427 * vterm capable LPAR machines
428 */
429#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
430void __init udbg_init_debug_lpar(void)
431{
432 /*
433 * If we're running as a hypervisor then we definitely can't call the
434 * hypervisor to print debug output (we *are* the hypervisor), so don't
435 * register if we detect that MSR_HV=1.
436 */
437 if (mfmsr() & MSR_HV)
438 return;
439
440 hvterm_privs[0] = &hvterm_priv0;
441 hvterm_priv0.termno = 0;
442 hvterm_priv0.proto = HV_PROTOCOL_RAW;
443 spin_lock_init(&hvterm_priv0.buf_lock);
444 udbg_putc = udbg_hvc_putc;
445 udbg_getc = udbg_hvc_getc;
446 udbg_getc_poll = udbg_hvc_getc_poll;
447}
448#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */
449
450#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI
451void __init udbg_init_debug_lpar_hvsi(void)
452{
453 /* See comment above in udbg_init_debug_lpar() */
454 if (mfmsr() & MSR_HV)
455 return;
456
457 hvterm_privs[0] = &hvterm_priv0;
458 hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
459 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
460 spin_lock_init(&hvterm_priv0.buf_lock);
461 udbg_putc = udbg_hvc_putc;
462 udbg_getc = udbg_hvc_getc;
463 udbg_getc_poll = udbg_hvc_getc_poll;
464 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
465 hvterm_priv0.termno, 1);
466 hvsilib_establish(&hvterm_priv0.hvsi);
467}
468#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */