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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#include <linux/of.h>
32
33#include <asm/hvconsole.h>
34#include <asm/vio.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
110/**
111 * hvterm_raw_put_chars: send characters to firmware for given vterm adapter
112 * @vtermno: The virtual terminal number.
113 * @buf: The characters to send. Because of the underlying hypercall in
114 * hvc_put_chars(), this buffer must be at least 16 bytes long, even if
115 * you are sending fewer chars.
116 * @count: number of chars to send.
117 */
118static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count)
119{
120 struct hvterm_priv *pv = hvterm_privs[vtermno];
121
122 if (WARN_ON(!pv))
123 return 0;
124
125 return hvc_put_chars(pv->termno, buf, count);
126}
127
128static const struct hv_ops hvterm_raw_ops = {
129 .get_chars = hvterm_raw_get_chars,
130 .put_chars = hvterm_raw_put_chars,
131 .notifier_add = notifier_add_irq,
132 .notifier_del = notifier_del_irq,
133 .notifier_hangup = notifier_hangup_irq,
134};
135
136static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
137{
138 struct hvterm_priv *pv = hvterm_privs[vtermno];
139
140 if (WARN_ON(!pv))
141 return 0;
142
143 return hvsilib_get_chars(&pv->hvsi, buf, count);
144}
145
146static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
147{
148 struct hvterm_priv *pv = hvterm_privs[vtermno];
149
150 if (WARN_ON(!pv))
151 return 0;
152
153 return hvsilib_put_chars(&pv->hvsi, buf, count);
154}
155
156static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
157{
158 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
159 int rc;
160
161 pr_devel("HVSI@%x: open !\n", pv->termno);
162
163 rc = notifier_add_irq(hp, data);
164 if (rc)
165 return rc;
166
167 return hvsilib_open(&pv->hvsi, hp);
168}
169
170static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
171{
172 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
173
174 pr_devel("HVSI@%x: do close !\n", pv->termno);
175
176 hvsilib_close(&pv->hvsi, hp);
177
178 notifier_del_irq(hp, data);
179}
180
181static void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
182{
183 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
184
185 pr_devel("HVSI@%x: do hangup !\n", pv->termno);
186
187 hvsilib_close(&pv->hvsi, hp);
188
189 notifier_hangup_irq(hp, data);
190}
191
192static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
193{
194 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
195
196 if (!pv)
197 return -EINVAL;
198 return pv->hvsi.mctrl;
199}
200
201static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
202 unsigned int clear)
203{
204 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
205
206 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
207 pv->termno, set, clear);
208
209 if (set & TIOCM_DTR)
210 hvsilib_write_mctrl(&pv->hvsi, 1);
211 else if (clear & TIOCM_DTR)
212 hvsilib_write_mctrl(&pv->hvsi, 0);
213
214 return 0;
215}
216
217static const struct hv_ops hvterm_hvsi_ops = {
218 .get_chars = hvterm_hvsi_get_chars,
219 .put_chars = hvterm_hvsi_put_chars,
220 .notifier_add = hvterm_hvsi_open,
221 .notifier_del = hvterm_hvsi_close,
222 .notifier_hangup = hvterm_hvsi_hangup,
223 .tiocmget = hvterm_hvsi_tiocmget,
224 .tiocmset = hvterm_hvsi_tiocmset,
225};
226
227static void udbg_hvc_putc(char c)
228{
229 int count = -1;
230 unsigned char bounce_buffer[16];
231
232 if (!hvterm_privs[0])
233 return;
234
235 if (c == '\n')
236 udbg_hvc_putc('\r');
237
238 do {
239 switch(hvterm_privs[0]->proto) {
240 case HV_PROTOCOL_RAW:
241 /*
242 * hvterm_raw_put_chars requires at least a 16-byte
243 * buffer, so go via the bounce buffer
244 */
245 bounce_buffer[0] = c;
246 count = hvterm_raw_put_chars(0, bounce_buffer, 1);
247 break;
248 case HV_PROTOCOL_HVSI:
249 count = hvterm_hvsi_put_chars(0, &c, 1);
250 break;
251 }
252 } while (count == 0 || count == -EAGAIN);
253}
254
255static int udbg_hvc_getc_poll(void)
256{
257 int rc = 0;
258 char c;
259
260 if (!hvterm_privs[0])
261 return -1;
262
263 switch(hvterm_privs[0]->proto) {
264 case HV_PROTOCOL_RAW:
265 rc = hvterm_raw_get_chars(0, &c, 1);
266 break;
267 case HV_PROTOCOL_HVSI:
268 rc = hvterm_hvsi_get_chars(0, &c, 1);
269 break;
270 }
271 if (!rc)
272 return -1;
273 return c;
274}
275
276static int udbg_hvc_getc(void)
277{
278 int ch;
279
280 if (!hvterm_privs[0])
281 return -1;
282
283 for (;;) {
284 ch = udbg_hvc_getc_poll();
285 if (ch == -1) {
286 /* This shouldn't be needed...but... */
287 volatile unsigned long delay;
288 for (delay=0; delay < 2000000; delay++)
289 ;
290 } else {
291 return ch;
292 }
293 }
294}
295
296static int hvc_vio_probe(struct vio_dev *vdev,
297 const struct vio_device_id *id)
298{
299 const struct hv_ops *ops;
300 struct hvc_struct *hp;
301 struct hvterm_priv *pv;
302 hv_protocol_t proto;
303 int i, termno = -1;
304
305 /* probed with invalid parameters. */
306 if (!vdev || !id)
307 return -EPERM;
308
309 if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
310 proto = HV_PROTOCOL_RAW;
311 ops = &hvterm_raw_ops;
312 } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
313 proto = HV_PROTOCOL_HVSI;
314 ops = &hvterm_hvsi_ops;
315 } else {
316 pr_err("hvc_vio: Unknown protocol for %pOF\n", vdev->dev.of_node);
317 return -ENXIO;
318 }
319
320 pr_devel("hvc_vio_probe() device %pOF, using %s protocol\n",
321 vdev->dev.of_node,
322 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
323
324 /* Is it our boot one ? */
325 if (hvterm_privs[0] == &hvterm_priv0 &&
326 vdev->unit_address == hvterm_priv0.termno) {
327 pv = hvterm_privs[0];
328 termno = 0;
329 pr_devel("->boot console, using termno 0\n");
330 }
331 /* nope, allocate a new one */
332 else {
333 for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
334 if (!hvterm_privs[i])
335 termno = i;
336 pr_devel("->non-boot console, using termno %d\n", termno);
337 if (termno < 0)
338 return -ENODEV;
339 pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
340 if (!pv)
341 return -ENOMEM;
342 pv->termno = vdev->unit_address;
343 pv->proto = proto;
344 spin_lock_init(&pv->buf_lock);
345 hvterm_privs[termno] = pv;
346 hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
347 pv->termno, 0);
348 }
349
350 hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
351 if (IS_ERR(hp))
352 return PTR_ERR(hp);
353 dev_set_drvdata(&vdev->dev, hp);
354
355 /* register udbg if it's not there already for console 0 */
356 if (hp->index == 0 && !udbg_putc) {
357 udbg_putc = udbg_hvc_putc;
358 udbg_getc = udbg_hvc_getc;
359 udbg_getc_poll = udbg_hvc_getc_poll;
360 }
361
362 return 0;
363}
364
365static struct vio_driver hvc_vio_driver = {
366 .id_table = hvc_driver_table,
367 .probe = hvc_vio_probe,
368 .name = hvc_driver_name,
369 .driver = {
370 .suppress_bind_attrs = true,
371 },
372};
373
374static int __init hvc_vio_init(void)
375{
376 int rc;
377
378 /* Register as a vio device to receive callbacks */
379 rc = vio_register_driver(&hvc_vio_driver);
380
381 return rc;
382}
383device_initcall(hvc_vio_init); /* after drivers/tty/hvc/hvc_console.c */
384
385void __init hvc_vio_init_early(void)
386{
387 const __be32 *termno;
388 const struct hv_ops *ops;
389
390 /* find the boot console from /chosen/stdout */
391 /* Check if it's a virtual terminal */
392 if (!of_node_name_prefix(of_stdout, "vty"))
393 return;
394 termno = of_get_property(of_stdout, "reg", NULL);
395 if (termno == NULL)
396 return;
397 hvterm_priv0.termno = of_read_number(termno, 1);
398 spin_lock_init(&hvterm_priv0.buf_lock);
399 hvterm_privs[0] = &hvterm_priv0;
400
401 /* Check the protocol */
402 if (of_device_is_compatible(of_stdout, "hvterm1")) {
403 hvterm_priv0.proto = HV_PROTOCOL_RAW;
404 ops = &hvterm_raw_ops;
405 }
406 else if (of_device_is_compatible(of_stdout, "hvterm-protocol")) {
407 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
408 ops = &hvterm_hvsi_ops;
409 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
410 hvterm_priv0.termno, 1);
411 /* HVSI, perform the handshake now */
412 hvsilib_establish(&hvterm_priv0.hvsi);
413 } else
414 return;
415 udbg_putc = udbg_hvc_putc;
416 udbg_getc = udbg_hvc_getc;
417 udbg_getc_poll = udbg_hvc_getc_poll;
418#ifdef HVC_OLD_HVSI
419 /* When using the old HVSI driver don't register the HVC
420 * backend for HVSI, only do udbg
421 */
422 if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
423 return;
424#endif
425 /* Check whether the user has requested a different console. */
426 if (!strstr(boot_command_line, "console="))
427 add_preferred_console("hvc", 0, NULL);
428 hvc_instantiate(0, 0, ops);
429}
430
431/* call this from early_init() for a working debug console on
432 * vterm capable LPAR machines
433 */
434#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
435void __init udbg_init_debug_lpar(void)
436{
437 /*
438 * If we're running as a hypervisor then we definitely can't call the
439 * hypervisor to print debug output (we *are* the hypervisor), so don't
440 * register if we detect that MSR_HV=1.
441 */
442 if (mfmsr() & MSR_HV)
443 return;
444
445 hvterm_privs[0] = &hvterm_priv0;
446 hvterm_priv0.termno = 0;
447 hvterm_priv0.proto = HV_PROTOCOL_RAW;
448 spin_lock_init(&hvterm_priv0.buf_lock);
449 udbg_putc = udbg_hvc_putc;
450 udbg_getc = udbg_hvc_getc;
451 udbg_getc_poll = udbg_hvc_getc_poll;
452}
453#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */
454
455#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI
456void __init udbg_init_debug_lpar_hvsi(void)
457{
458 /* See comment above in udbg_init_debug_lpar() */
459 if (mfmsr() & MSR_HV)
460 return;
461
462 hvterm_privs[0] = &hvterm_priv0;
463 hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
464 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
465 spin_lock_init(&hvterm_priv0.buf_lock);
466 udbg_putc = udbg_hvc_putc;
467 udbg_getc = udbg_hvc_getc;
468 udbg_getc_poll = udbg_hvc_getc_poll;
469 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
470 hvterm_priv0.termno, 1);
471 hvsilib_establish(&hvterm_priv0.hvsi);
472}
473#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */