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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 u8 buf[SIZE_VIO_GET_CHARS];
62 size_t left;
63 size_t 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 ssize_t hvterm_raw_get_chars(uint32_t vtermno, u8 *buf, size_t count)
70{
71 struct hvterm_priv *pv = hvterm_privs[vtermno];
72 unsigned long i;
73 unsigned long flags;
74 size_t 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 ssize_t hvterm_raw_put_chars(uint32_t vtermno, const u8 *buf,
119 size_t count)
120{
121 struct hvterm_priv *pv = hvterm_privs[vtermno];
122
123 if (WARN_ON(!pv))
124 return 0;
125
126 return hvc_put_chars(pv->termno, buf, count);
127}
128
129static const struct hv_ops hvterm_raw_ops = {
130 .get_chars = hvterm_raw_get_chars,
131 .put_chars = hvterm_raw_put_chars,
132 .notifier_add = notifier_add_irq,
133 .notifier_del = notifier_del_irq,
134 .notifier_hangup = notifier_hangup_irq,
135};
136
137static ssize_t hvterm_hvsi_get_chars(uint32_t vtermno, u8 *buf, size_t count)
138{
139 struct hvterm_priv *pv = hvterm_privs[vtermno];
140
141 if (WARN_ON(!pv))
142 return 0;
143
144 return hvsilib_get_chars(&pv->hvsi, buf, count);
145}
146
147static ssize_t hvterm_hvsi_put_chars(uint32_t vtermno, const u8 *buf,
148 size_t count)
149{
150 struct hvterm_priv *pv = hvterm_privs[vtermno];
151
152 if (WARN_ON(!pv))
153 return 0;
154
155 return hvsilib_put_chars(&pv->hvsi, buf, count);
156}
157
158static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
159{
160 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
161 int rc;
162
163 pr_devel("HVSI@%x: open !\n", pv->termno);
164
165 rc = notifier_add_irq(hp, data);
166 if (rc)
167 return rc;
168
169 return hvsilib_open(&pv->hvsi, hp);
170}
171
172static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
173{
174 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
175
176 pr_devel("HVSI@%x: do close !\n", pv->termno);
177
178 hvsilib_close(&pv->hvsi, hp);
179
180 notifier_del_irq(hp, data);
181}
182
183static void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
184{
185 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
186
187 pr_devel("HVSI@%x: do hangup !\n", pv->termno);
188
189 hvsilib_close(&pv->hvsi, hp);
190
191 notifier_hangup_irq(hp, data);
192}
193
194static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
195{
196 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
197
198 if (!pv)
199 return -EINVAL;
200 return pv->hvsi.mctrl;
201}
202
203static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
204 unsigned int clear)
205{
206 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
207
208 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
209 pv->termno, set, clear);
210
211 if (set & TIOCM_DTR)
212 hvsilib_write_mctrl(&pv->hvsi, 1);
213 else if (clear & TIOCM_DTR)
214 hvsilib_write_mctrl(&pv->hvsi, 0);
215
216 return 0;
217}
218
219static const struct hv_ops hvterm_hvsi_ops = {
220 .get_chars = hvterm_hvsi_get_chars,
221 .put_chars = hvterm_hvsi_put_chars,
222 .notifier_add = hvterm_hvsi_open,
223 .notifier_del = hvterm_hvsi_close,
224 .notifier_hangup = hvterm_hvsi_hangup,
225 .tiocmget = hvterm_hvsi_tiocmget,
226 .tiocmset = hvterm_hvsi_tiocmset,
227};
228
229static void udbg_hvc_putc(char c)
230{
231 int count = -1;
232 unsigned char bounce_buffer[16];
233
234 if (!hvterm_privs[0])
235 return;
236
237 if (c == '\n')
238 udbg_hvc_putc('\r');
239
240 do {
241 switch(hvterm_privs[0]->proto) {
242 case HV_PROTOCOL_RAW:
243 /*
244 * hvterm_raw_put_chars requires at least a 16-byte
245 * buffer, so go via the bounce buffer
246 */
247 bounce_buffer[0] = c;
248 count = hvterm_raw_put_chars(0, bounce_buffer, 1);
249 break;
250 case HV_PROTOCOL_HVSI:
251 count = hvterm_hvsi_put_chars(0, &c, 1);
252 break;
253 }
254 } while (count == 0 || count == -EAGAIN);
255}
256
257static int udbg_hvc_getc_poll(void)
258{
259 int rc = 0;
260 char c;
261
262 if (!hvterm_privs[0])
263 return -1;
264
265 switch(hvterm_privs[0]->proto) {
266 case HV_PROTOCOL_RAW:
267 rc = hvterm_raw_get_chars(0, &c, 1);
268 break;
269 case HV_PROTOCOL_HVSI:
270 rc = hvterm_hvsi_get_chars(0, &c, 1);
271 break;
272 }
273 if (!rc)
274 return -1;
275 return c;
276}
277
278static int udbg_hvc_getc(void)
279{
280 int ch;
281
282 if (!hvterm_privs[0])
283 return -1;
284
285 for (;;) {
286 ch = udbg_hvc_getc_poll();
287 if (ch == -1) {
288 /* This shouldn't be needed...but... */
289 volatile unsigned long delay;
290 for (delay=0; delay < 2000000; delay++)
291 ;
292 } else {
293 return ch;
294 }
295 }
296}
297
298static int hvc_vio_probe(struct vio_dev *vdev,
299 const struct vio_device_id *id)
300{
301 const struct hv_ops *ops;
302 struct hvc_struct *hp;
303 struct hvterm_priv *pv;
304 hv_protocol_t proto;
305 int i, termno = -1;
306
307 /* probed with invalid parameters. */
308 if (!vdev || !id)
309 return -EPERM;
310
311 if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
312 proto = HV_PROTOCOL_RAW;
313 ops = &hvterm_raw_ops;
314 } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
315 proto = HV_PROTOCOL_HVSI;
316 ops = &hvterm_hvsi_ops;
317 } else {
318 pr_err("hvc_vio: Unknown protocol for %pOF\n", vdev->dev.of_node);
319 return -ENXIO;
320 }
321
322 pr_devel("hvc_vio_probe() device %pOF, using %s protocol\n",
323 vdev->dev.of_node,
324 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
325
326 /* Is it our boot one ? */
327 if (hvterm_privs[0] == &hvterm_priv0 &&
328 vdev->unit_address == hvterm_priv0.termno) {
329 pv = hvterm_privs[0];
330 termno = 0;
331 pr_devel("->boot console, using termno 0\n");
332 }
333 /* nope, allocate a new one */
334 else {
335 for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
336 if (!hvterm_privs[i])
337 termno = i;
338 pr_devel("->non-boot console, using termno %d\n", termno);
339 if (termno < 0)
340 return -ENODEV;
341 pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
342 if (!pv)
343 return -ENOMEM;
344 pv->termno = vdev->unit_address;
345 pv->proto = proto;
346 spin_lock_init(&pv->buf_lock);
347 hvterm_privs[termno] = pv;
348 hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
349 pv->termno, 0);
350 }
351
352 hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
353 if (IS_ERR(hp))
354 return PTR_ERR(hp);
355 dev_set_drvdata(&vdev->dev, hp);
356
357 /* register udbg if it's not there already for console 0 */
358 if (hp->index == 0 && !udbg_putc) {
359 udbg_putc = udbg_hvc_putc;
360 udbg_getc = udbg_hvc_getc;
361 udbg_getc_poll = udbg_hvc_getc_poll;
362 }
363
364 return 0;
365}
366
367static struct vio_driver hvc_vio_driver = {
368 .id_table = hvc_driver_table,
369 .probe = hvc_vio_probe,
370 .name = hvc_driver_name,
371 .driver = {
372 .suppress_bind_attrs = true,
373 },
374};
375
376static int __init hvc_vio_init(void)
377{
378 int rc;
379
380 /* Register as a vio device to receive callbacks */
381 rc = vio_register_driver(&hvc_vio_driver);
382
383 return rc;
384}
385device_initcall(hvc_vio_init); /* after drivers/tty/hvc/hvc_console.c */
386
387void __init hvc_vio_init_early(void)
388{
389 const __be32 *termno;
390 const struct hv_ops *ops;
391
392 /* find the boot console from /chosen/stdout */
393 /* Check if it's a virtual terminal */
394 if (!of_node_name_prefix(of_stdout, "vty"))
395 return;
396 termno = of_get_property(of_stdout, "reg", NULL);
397 if (termno == NULL)
398 return;
399 hvterm_priv0.termno = of_read_number(termno, 1);
400 spin_lock_init(&hvterm_priv0.buf_lock);
401 hvterm_privs[0] = &hvterm_priv0;
402
403 /* Check the protocol */
404 if (of_device_is_compatible(of_stdout, "hvterm1")) {
405 hvterm_priv0.proto = HV_PROTOCOL_RAW;
406 ops = &hvterm_raw_ops;
407 }
408 else if (of_device_is_compatible(of_stdout, "hvterm-protocol")) {
409 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
410 ops = &hvterm_hvsi_ops;
411 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
412 hvterm_priv0.termno, 1);
413 /* HVSI, perform the handshake now */
414 hvsilib_establish(&hvterm_priv0.hvsi);
415 } else
416 return;
417 udbg_putc = udbg_hvc_putc;
418 udbg_getc = udbg_hvc_getc;
419 udbg_getc_poll = udbg_hvc_getc_poll;
420#ifdef HVC_OLD_HVSI
421 /* When using the old HVSI driver don't register the HVC
422 * backend for HVSI, only do udbg
423 */
424 if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
425 return;
426#endif
427 /* Check whether the user has requested a different console. */
428 if (!strstr(boot_command_line, "console="))
429 add_preferred_console("hvc", 0, NULL);
430 hvc_instantiate(0, 0, ops);
431}
432
433/* call this from early_init() for a working debug console on
434 * vterm capable LPAR machines
435 */
436#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
437void __init udbg_init_debug_lpar(void)
438{
439 /*
440 * If we're running as a hypervisor then we definitely can't call the
441 * hypervisor to print debug output (we *are* the hypervisor), so don't
442 * register if we detect that MSR_HV=1.
443 */
444 if (mfmsr() & MSR_HV)
445 return;
446
447 hvterm_privs[0] = &hvterm_priv0;
448 hvterm_priv0.termno = 0;
449 hvterm_priv0.proto = HV_PROTOCOL_RAW;
450 spin_lock_init(&hvterm_priv0.buf_lock);
451 udbg_putc = udbg_hvc_putc;
452 udbg_getc = udbg_hvc_getc;
453 udbg_getc_poll = udbg_hvc_getc_poll;
454}
455#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */
456
457#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI
458void __init udbg_init_debug_lpar_hvsi(void)
459{
460 /* See comment above in udbg_init_debug_lpar() */
461 if (mfmsr() & MSR_HV)
462 return;
463
464 hvterm_privs[0] = &hvterm_priv0;
465 hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
466 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
467 spin_lock_init(&hvterm_priv0.buf_lock);
468 udbg_putc = udbg_hvc_putc;
469 udbg_getc = udbg_hvc_getc;
470 udbg_getc_poll = udbg_hvc_getc_poll;
471 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
472 hvterm_priv0.termno, 1);
473 hvsilib_establish(&hvterm_priv0.hvsi);
474}
475#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */
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/hvsi.h>
49#include <asm/udbg.h>
50#include <asm/machdep.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[] = {
57 {"serial", "hvterm1"},
58#ifndef HVC_OLD_HVSI
59 {"serial", "hvterm-protocol"},
60#endif
61 { "", "" }
62};
63
64typedef enum hv_protocol {
65 HV_PROTOCOL_RAW,
66 HV_PROTOCOL_HVSI
67} hv_protocol_t;
68
69struct hvterm_priv {
70 u32 termno; /* HV term number */
71 hv_protocol_t proto; /* Raw data or HVSI packets */
72 struct hvsi_priv hvsi; /* HVSI specific data */
73 spinlock_t buf_lock;
74 char buf[SIZE_VIO_GET_CHARS];
75 int left;
76 int offset;
77};
78static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES];
79/* For early boot console */
80static struct hvterm_priv hvterm_priv0;
81
82static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count)
83{
84 struct hvterm_priv *pv = hvterm_privs[vtermno];
85 unsigned long i;
86 unsigned long flags;
87 int got;
88
89 if (WARN_ON(!pv))
90 return 0;
91
92 spin_lock_irqsave(&pv->buf_lock, flags);
93
94 if (pv->left == 0) {
95 pv->offset = 0;
96 pv->left = hvc_get_chars(pv->termno, pv->buf, count);
97
98 /*
99 * Work around a HV bug where it gives us a null
100 * after every \r. -- paulus
101 */
102 for (i = 1; i < pv->left; ++i) {
103 if (pv->buf[i] == 0 && pv->buf[i-1] == '\r') {
104 --pv->left;
105 if (i < pv->left) {
106 memmove(&pv->buf[i], &pv->buf[i+1],
107 pv->left - i);
108 }
109 }
110 }
111 }
112
113 got = min(count, pv->left);
114 memcpy(buf, &pv->buf[pv->offset], got);
115 pv->offset += got;
116 pv->left -= got;
117
118 spin_unlock_irqrestore(&pv->buf_lock, flags);
119
120 return got;
121}
122
123static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count)
124{
125 struct hvterm_priv *pv = hvterm_privs[vtermno];
126
127 if (WARN_ON(!pv))
128 return 0;
129
130 return hvc_put_chars(pv->termno, buf, count);
131}
132
133static const struct hv_ops hvterm_raw_ops = {
134 .get_chars = hvterm_raw_get_chars,
135 .put_chars = hvterm_raw_put_chars,
136 .notifier_add = notifier_add_irq,
137 .notifier_del = notifier_del_irq,
138 .notifier_hangup = notifier_hangup_irq,
139};
140
141static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
142{
143 struct hvterm_priv *pv = hvterm_privs[vtermno];
144
145 if (WARN_ON(!pv))
146 return 0;
147
148 return hvsilib_get_chars(&pv->hvsi, buf, count);
149}
150
151static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
152{
153 struct hvterm_priv *pv = hvterm_privs[vtermno];
154
155 if (WARN_ON(!pv))
156 return 0;
157
158 return hvsilib_put_chars(&pv->hvsi, buf, count);
159}
160
161static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
162{
163 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
164 int rc;
165
166 pr_devel("HVSI@%x: open !\n", pv->termno);
167
168 rc = notifier_add_irq(hp, data);
169 if (rc)
170 return rc;
171
172 return hvsilib_open(&pv->hvsi, hp);
173}
174
175static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
176{
177 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
178
179 pr_devel("HVSI@%x: do close !\n", pv->termno);
180
181 hvsilib_close(&pv->hvsi, hp);
182
183 notifier_del_irq(hp, data);
184}
185
186void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
187{
188 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
189
190 pr_devel("HVSI@%x: do hangup !\n", pv->termno);
191
192 hvsilib_close(&pv->hvsi, hp);
193
194 notifier_hangup_irq(hp, data);
195}
196
197static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
198{
199 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
200
201 if (!pv)
202 return -EINVAL;
203 return pv->hvsi.mctrl;
204}
205
206static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
207 unsigned int clear)
208{
209 struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
210
211 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
212 pv->termno, set, clear);
213
214 if (set & TIOCM_DTR)
215 hvsilib_write_mctrl(&pv->hvsi, 1);
216 else if (clear & TIOCM_DTR)
217 hvsilib_write_mctrl(&pv->hvsi, 0);
218
219 return 0;
220}
221
222static const struct hv_ops hvterm_hvsi_ops = {
223 .get_chars = hvterm_hvsi_get_chars,
224 .put_chars = hvterm_hvsi_put_chars,
225 .notifier_add = hvterm_hvsi_open,
226 .notifier_del = hvterm_hvsi_close,
227 .notifier_hangup = hvterm_hvsi_hangup,
228 .tiocmget = hvterm_hvsi_tiocmget,
229 .tiocmset = hvterm_hvsi_tiocmset,
230};
231
232static void udbg_hvc_putc(char c)
233{
234 int count = -1;
235
236 if (!hvterm_privs[0])
237 return;
238
239 if (c == '\n')
240 udbg_hvc_putc('\r');
241
242 do {
243 switch(hvterm_privs[0]->proto) {
244 case HV_PROTOCOL_RAW:
245 count = hvterm_raw_put_chars(0, &c, 1);
246 break;
247 case HV_PROTOCOL_HVSI:
248 count = hvterm_hvsi_put_chars(0, &c, 1);
249 break;
250 }
251 } while(count == 0);
252}
253
254static int udbg_hvc_getc_poll(void)
255{
256 int rc = 0;
257 char c;
258
259 if (!hvterm_privs[0])
260 return -1;
261
262 switch(hvterm_privs[0]->proto) {
263 case HV_PROTOCOL_RAW:
264 rc = hvterm_raw_get_chars(0, &c, 1);
265 break;
266 case HV_PROTOCOL_HVSI:
267 rc = hvterm_hvsi_get_chars(0, &c, 1);
268 break;
269 }
270 if (!rc)
271 return -1;
272 return c;
273}
274
275static int udbg_hvc_getc(void)
276{
277 int ch;
278
279 if (!hvterm_privs[0])
280 return -1;
281
282 for (;;) {
283 ch = udbg_hvc_getc_poll();
284 if (ch == -1) {
285 /* This shouldn't be needed...but... */
286 volatile unsigned long delay;
287 for (delay=0; delay < 2000000; delay++)
288 ;
289 } else {
290 return ch;
291 }
292 }
293}
294
295static int hvc_vio_probe(struct vio_dev *vdev,
296 const struct vio_device_id *id)
297{
298 const struct hv_ops *ops;
299 struct hvc_struct *hp;
300 struct hvterm_priv *pv;
301 hv_protocol_t proto;
302 int i, termno = -1;
303
304 /* probed with invalid parameters. */
305 if (!vdev || !id)
306 return -EPERM;
307
308 if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
309 proto = HV_PROTOCOL_RAW;
310 ops = &hvterm_raw_ops;
311 } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
312 proto = HV_PROTOCOL_HVSI;
313 ops = &hvterm_hvsi_ops;
314 } else {
315 pr_err("hvc_vio: Unknown protocol for %s\n", vdev->dev.of_node->full_name);
316 return -ENXIO;
317 }
318
319 pr_devel("hvc_vio_probe() device %s, using %s protocol\n",
320 vdev->dev.of_node->full_name,
321 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
322
323 /* Is it our boot one ? */
324 if (hvterm_privs[0] == &hvterm_priv0 &&
325 vdev->unit_address == hvterm_priv0.termno) {
326 pv = hvterm_privs[0];
327 termno = 0;
328 pr_devel("->boot console, using termno 0\n");
329 }
330 /* nope, allocate a new one */
331 else {
332 for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
333 if (!hvterm_privs[i])
334 termno = i;
335 pr_devel("->non-boot console, using termno %d\n", termno);
336 if (termno < 0)
337 return -ENODEV;
338 pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
339 if (!pv)
340 return -ENOMEM;
341 pv->termno = vdev->unit_address;
342 pv->proto = proto;
343 spin_lock_init(&pv->buf_lock);
344 hvterm_privs[termno] = pv;
345 hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
346 pv->termno, 0);
347 }
348
349 hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
350 if (IS_ERR(hp))
351 return PTR_ERR(hp);
352 dev_set_drvdata(&vdev->dev, hp);
353
354 /* register udbg if it's not there already for console 0 */
355 if (hp->index == 0 && !udbg_putc) {
356 udbg_putc = udbg_hvc_putc;
357 udbg_getc = udbg_hvc_getc;
358 udbg_getc_poll = udbg_hvc_getc_poll;
359 }
360
361 return 0;
362}
363
364static struct vio_driver hvc_vio_driver = {
365 .id_table = hvc_driver_table,
366 .probe = hvc_vio_probe,
367 .name = hvc_driver_name,
368 .driver = {
369 .suppress_bind_attrs = true,
370 },
371};
372
373static int __init hvc_vio_init(void)
374{
375 int rc;
376
377 /* Register as a vio device to receive callbacks */
378 rc = vio_register_driver(&hvc_vio_driver);
379
380 return rc;
381}
382device_initcall(hvc_vio_init); /* after drivers/tty/hvc/hvc_console.c */
383
384void __init hvc_vio_init_early(void)
385{
386 const __be32 *termno;
387 const char *name;
388 const struct hv_ops *ops;
389
390 /* find the boot console from /chosen/stdout */
391 if (!of_stdout)
392 return;
393 name = of_get_property(of_stdout, "name", NULL);
394 if (!name) {
395 printk(KERN_WARNING "stdout node missing 'name' property!\n");
396 return;
397 }
398
399 /* Check if it's a virtual terminal */
400 if (strncmp(name, "vty", 3) != 0)
401 return;
402 termno = of_get_property(of_stdout, "reg", NULL);
403 if (termno == NULL)
404 return;
405 hvterm_priv0.termno = of_read_number(termno, 1);
406 spin_lock_init(&hvterm_priv0.buf_lock);
407 hvterm_privs[0] = &hvterm_priv0;
408
409 /* Check the protocol */
410 if (of_device_is_compatible(of_stdout, "hvterm1")) {
411 hvterm_priv0.proto = HV_PROTOCOL_RAW;
412 ops = &hvterm_raw_ops;
413 }
414 else if (of_device_is_compatible(of_stdout, "hvterm-protocol")) {
415 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
416 ops = &hvterm_hvsi_ops;
417 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
418 hvterm_priv0.termno, 1);
419 /* HVSI, perform the handshake now */
420 hvsilib_establish(&hvterm_priv0.hvsi);
421 } else
422 return;
423 udbg_putc = udbg_hvc_putc;
424 udbg_getc = udbg_hvc_getc;
425 udbg_getc_poll = udbg_hvc_getc_poll;
426#ifdef HVC_OLD_HVSI
427 /* When using the old HVSI driver don't register the HVC
428 * backend for HVSI, only do udbg
429 */
430 if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
431 return;
432#endif
433 /* Check whether the user has requested a different console. */
434 if (!strstr(boot_command_line, "console="))
435 add_preferred_console("hvc", 0, NULL);
436 hvc_instantiate(0, 0, ops);
437}
438
439/* call this from early_init() for a working debug console on
440 * vterm capable LPAR machines
441 */
442#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
443void __init udbg_init_debug_lpar(void)
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 hvterm_privs[0] = &hvterm_priv0;
459 hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
460 hvterm_priv0.proto = HV_PROTOCOL_HVSI;
461 spin_lock_init(&hvterm_priv0.buf_lock);
462 udbg_putc = udbg_hvc_putc;
463 udbg_getc = udbg_hvc_getc;
464 udbg_getc_poll = udbg_hvc_getc_poll;
465 hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
466 hvterm_priv0.termno, 1);
467 hvsilib_establish(&hvterm_priv0.hvsi);
468}
469#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */