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1/*
2 * opal driver interface to hvc_console.c
3 *
4 * Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#undef DEBUG
23
24#include <linux/types.h>
25#include <linux/init.h>
26#include <linux/delay.h>
27#include <linux/slab.h>
28#include <linux/console.h>
29#include <linux/of.h>
30#include <linux/of_platform.h>
31#include <linux/export.h>
32#include <linux/interrupt.h>
33
34#include <asm/hvconsole.h>
35#include <asm/prom.h>
36#include <asm/firmware.h>
37#include <asm/hvsi.h>
38#include <asm/udbg.h>
39#include <asm/opal.h>
40
41#include "hvc_console.h"
42
43static const char hvc_opal_name[] = "hvc_opal";
44
45static const struct of_device_id hvc_opal_match[] = {
46 { .name = "serial", .compatible = "ibm,opal-console-raw" },
47 { .name = "serial", .compatible = "ibm,opal-console-hvsi" },
48 { },
49};
50
51typedef enum hv_protocol {
52 HV_PROTOCOL_RAW,
53 HV_PROTOCOL_HVSI
54} hv_protocol_t;
55
56struct hvc_opal_priv {
57 hv_protocol_t proto; /* Raw data or HVSI packets */
58 struct hvsi_priv hvsi; /* HVSI specific data */
59};
60static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
61
62/* For early boot console */
63static struct hvc_opal_priv hvc_opal_boot_priv;
64static u32 hvc_opal_boot_termno;
65
66static const struct hv_ops hvc_opal_raw_ops = {
67 .get_chars = opal_get_chars,
68 .put_chars = opal_put_chars,
69 .notifier_add = notifier_add_irq,
70 .notifier_del = notifier_del_irq,
71 .notifier_hangup = notifier_hangup_irq,
72};
73
74static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
75{
76 struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
77
78 if (WARN_ON(!pv))
79 return -ENODEV;
80
81 return hvsilib_get_chars(&pv->hvsi, buf, count);
82}
83
84static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
85{
86 struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
87
88 if (WARN_ON(!pv))
89 return -ENODEV;
90
91 return hvsilib_put_chars(&pv->hvsi, buf, count);
92}
93
94static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
95{
96 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
97 int rc;
98
99 pr_devel("HVSI@%x: do open !\n", hp->vtermno);
100
101 rc = notifier_add_irq(hp, data);
102 if (rc)
103 return rc;
104
105 return hvsilib_open(&pv->hvsi, hp);
106}
107
108static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
109{
110 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
111
112 pr_devel("HVSI@%x: do close !\n", hp->vtermno);
113
114 hvsilib_close(&pv->hvsi, hp);
115
116 notifier_del_irq(hp, data);
117}
118
119void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
120{
121 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
122
123 pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);
124
125 hvsilib_close(&pv->hvsi, hp);
126
127 notifier_hangup_irq(hp, data);
128}
129
130static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
131{
132 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
133
134 if (!pv)
135 return -EINVAL;
136 return pv->hvsi.mctrl;
137}
138
139static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
140 unsigned int clear)
141{
142 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
143
144 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
145 hp->vtermno, set, clear);
146
147 if (set & TIOCM_DTR)
148 hvsilib_write_mctrl(&pv->hvsi, 1);
149 else if (clear & TIOCM_DTR)
150 hvsilib_write_mctrl(&pv->hvsi, 0);
151
152 return 0;
153}
154
155static const struct hv_ops hvc_opal_hvsi_ops = {
156 .get_chars = hvc_opal_hvsi_get_chars,
157 .put_chars = hvc_opal_hvsi_put_chars,
158 .notifier_add = hvc_opal_hvsi_open,
159 .notifier_del = hvc_opal_hvsi_close,
160 .notifier_hangup = hvc_opal_hvsi_hangup,
161 .tiocmget = hvc_opal_hvsi_tiocmget,
162 .tiocmset = hvc_opal_hvsi_tiocmset,
163};
164
165static int hvc_opal_probe(struct platform_device *dev)
166{
167 const struct hv_ops *ops;
168 struct hvc_struct *hp;
169 struct hvc_opal_priv *pv;
170 hv_protocol_t proto;
171 unsigned int termno, irq, boot = 0;
172 const __be32 *reg;
173
174 if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
175 proto = HV_PROTOCOL_RAW;
176 ops = &hvc_opal_raw_ops;
177 } else if (of_device_is_compatible(dev->dev.of_node,
178 "ibm,opal-console-hvsi")) {
179 proto = HV_PROTOCOL_HVSI;
180 ops = &hvc_opal_hvsi_ops;
181 } else {
182 pr_err("hvc_opal: Unknown protocol for %s\n",
183 dev->dev.of_node->full_name);
184 return -ENXIO;
185 }
186
187 reg = of_get_property(dev->dev.of_node, "reg", NULL);
188 termno = reg ? be32_to_cpup(reg) : 0;
189
190 /* Is it our boot one ? */
191 if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
192 pv = hvc_opal_privs[termno];
193 boot = 1;
194 } else if (hvc_opal_privs[termno] == NULL) {
195 pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
196 if (!pv)
197 return -ENOMEM;
198 pv->proto = proto;
199 hvc_opal_privs[termno] = pv;
200 if (proto == HV_PROTOCOL_HVSI)
201 hvsilib_init(&pv->hvsi, opal_get_chars, opal_put_chars,
202 termno, 0);
203
204 /* Instanciate now to establish a mapping index==vtermno */
205 hvc_instantiate(termno, termno, ops);
206 } else {
207 pr_err("hvc_opal: Device %s has duplicate terminal number #%d\n",
208 dev->dev.of_node->full_name, termno);
209 return -ENXIO;
210 }
211
212 pr_info("hvc%d: %s protocol on %s%s\n", termno,
213 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
214 dev->dev.of_node->full_name,
215 boot ? " (boot console)" : "");
216
217 irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
218 if (!irq) {
219 pr_err("hvc_opal: Unable to map interrupt for device %s\n",
220 dev->dev.of_node->full_name);
221 return irq;
222 }
223
224 hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
225 if (IS_ERR(hp))
226 return PTR_ERR(hp);
227 dev_set_drvdata(&dev->dev, hp);
228
229 return 0;
230}
231
232static int hvc_opal_remove(struct platform_device *dev)
233{
234 struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
235 int rc, termno;
236
237 termno = hp->vtermno;
238 rc = hvc_remove(hp);
239 if (rc == 0) {
240 if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
241 kfree(hvc_opal_privs[termno]);
242 hvc_opal_privs[termno] = NULL;
243 }
244 return rc;
245}
246
247static struct platform_driver hvc_opal_driver = {
248 .probe = hvc_opal_probe,
249 .remove = hvc_opal_remove,
250 .driver = {
251 .name = hvc_opal_name,
252 .of_match_table = hvc_opal_match,
253 }
254};
255
256static int __init hvc_opal_init(void)
257{
258 if (!firmware_has_feature(FW_FEATURE_OPAL))
259 return -ENODEV;
260
261 /* Register as a vio device to receive callbacks */
262 return platform_driver_register(&hvc_opal_driver);
263}
264device_initcall(hvc_opal_init);
265
266static void udbg_opal_putc(char c)
267{
268 unsigned int termno = hvc_opal_boot_termno;
269 int count = -1;
270
271 if (c == '\n')
272 udbg_opal_putc('\r');
273
274 do {
275 switch(hvc_opal_boot_priv.proto) {
276 case HV_PROTOCOL_RAW:
277 count = opal_put_chars(termno, &c, 1);
278 break;
279 case HV_PROTOCOL_HVSI:
280 count = hvc_opal_hvsi_put_chars(termno, &c, 1);
281 break;
282 }
283 } while(count == 0 || count == -EAGAIN);
284}
285
286static int udbg_opal_getc_poll(void)
287{
288 unsigned int termno = hvc_opal_boot_termno;
289 int rc = 0;
290 char c;
291
292 switch(hvc_opal_boot_priv.proto) {
293 case HV_PROTOCOL_RAW:
294 rc = opal_get_chars(termno, &c, 1);
295 break;
296 case HV_PROTOCOL_HVSI:
297 rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
298 break;
299 }
300 if (!rc)
301 return -1;
302 return c;
303}
304
305static int udbg_opal_getc(void)
306{
307 int ch;
308 for (;;) {
309 ch = udbg_opal_getc_poll();
310 if (ch == -1) {
311 /* This shouldn't be needed...but... */
312 volatile unsigned long delay;
313 for (delay=0; delay < 2000000; delay++)
314 ;
315 } else {
316 return ch;
317 }
318 }
319}
320
321static void udbg_init_opal_common(void)
322{
323 udbg_putc = udbg_opal_putc;
324 udbg_getc = udbg_opal_getc;
325 udbg_getc_poll = udbg_opal_getc_poll;
326 tb_ticks_per_usec = 0x200; /* Make udelay not suck */
327}
328
329void __init hvc_opal_init_early(void)
330{
331 struct device_node *stdout_node = of_node_get(of_stdout);
332 const __be32 *termno;
333 const struct hv_ops *ops;
334 u32 index;
335
336 /* If the console wasn't in /chosen, try /ibm,opal */
337 if (!stdout_node) {
338 struct device_node *opal, *np;
339
340 /* Current OPAL takeover doesn't provide the stdout
341 * path, so we hard wire it
342 */
343 opal = of_find_node_by_path("/ibm,opal/consoles");
344 if (opal)
345 pr_devel("hvc_opal: Found consoles in new location\n");
346 if (!opal) {
347 opal = of_find_node_by_path("/ibm,opal");
348 if (opal)
349 pr_devel("hvc_opal: "
350 "Found consoles in old location\n");
351 }
352 if (!opal)
353 return;
354 for_each_child_of_node(opal, np) {
355 if (!strcmp(np->name, "serial")) {
356 stdout_node = np;
357 break;
358 }
359 }
360 of_node_put(opal);
361 }
362 if (!stdout_node)
363 return;
364 termno = of_get_property(stdout_node, "reg", NULL);
365 index = termno ? be32_to_cpup(termno) : 0;
366 if (index >= MAX_NR_HVC_CONSOLES)
367 return;
368 hvc_opal_privs[index] = &hvc_opal_boot_priv;
369
370 /* Check the protocol */
371 if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
372 hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
373 ops = &hvc_opal_raw_ops;
374 pr_devel("hvc_opal: Found RAW console\n");
375 }
376 else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
377 hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
378 ops = &hvc_opal_hvsi_ops;
379 hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars,
380 opal_put_chars, index, 1);
381 /* HVSI, perform the handshake now */
382 hvsilib_establish(&hvc_opal_boot_priv.hvsi);
383 pr_devel("hvc_opal: Found HVSI console\n");
384 } else
385 goto out;
386 hvc_opal_boot_termno = index;
387 udbg_init_opal_common();
388 add_preferred_console("hvc", index, NULL);
389 hvc_instantiate(index, index, ops);
390out:
391 of_node_put(stdout_node);
392}
393
394#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
395void __init udbg_init_debug_opal_raw(void)
396{
397 u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
398 hvc_opal_privs[index] = &hvc_opal_boot_priv;
399 hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
400 hvc_opal_boot_termno = index;
401 udbg_init_opal_common();
402}
403#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */
404
405#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
406void __init udbg_init_debug_opal_hvsi(void)
407{
408 u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
409 hvc_opal_privs[index] = &hvc_opal_boot_priv;
410 hvc_opal_boot_termno = index;
411 udbg_init_opal_common();
412 hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars, opal_put_chars,
413 index, 1);
414 hvsilib_establish(&hvc_opal_boot_priv.hvsi);
415}
416#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * opal driver interface to hvc_console.c
4 *
5 * Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
6 */
7
8#undef DEBUG
9
10#include <linux/types.h>
11#include <linux/init.h>
12#include <linux/delay.h>
13#include <linux/slab.h>
14#include <linux/console.h>
15#include <linux/of.h>
16#include <linux/of_platform.h>
17#include <linux/export.h>
18#include <linux/interrupt.h>
19
20#include <asm/hvconsole.h>
21#include <asm/prom.h>
22#include <asm/firmware.h>
23#include <asm/hvsi.h>
24#include <asm/udbg.h>
25#include <asm/opal.h>
26
27#include "hvc_console.h"
28
29static const char hvc_opal_name[] = "hvc_opal";
30
31static const struct of_device_id hvc_opal_match[] = {
32 { .name = "serial", .compatible = "ibm,opal-console-raw" },
33 { .name = "serial", .compatible = "ibm,opal-console-hvsi" },
34 { },
35};
36
37typedef enum hv_protocol {
38 HV_PROTOCOL_RAW,
39 HV_PROTOCOL_HVSI
40} hv_protocol_t;
41
42struct hvc_opal_priv {
43 hv_protocol_t proto; /* Raw data or HVSI packets */
44 struct hvsi_priv hvsi; /* HVSI specific data */
45};
46static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
47
48/* For early boot console */
49static struct hvc_opal_priv hvc_opal_boot_priv;
50static u32 hvc_opal_boot_termno;
51
52static const struct hv_ops hvc_opal_raw_ops = {
53 .get_chars = opal_get_chars,
54 .put_chars = opal_put_chars,
55 .flush = opal_flush_chars,
56 .notifier_add = notifier_add_irq,
57 .notifier_del = notifier_del_irq,
58 .notifier_hangup = notifier_hangup_irq,
59};
60
61static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
62{
63 struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
64
65 if (WARN_ON(!pv))
66 return -ENODEV;
67
68 return hvsilib_get_chars(&pv->hvsi, buf, count);
69}
70
71static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
72{
73 struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
74
75 if (WARN_ON(!pv))
76 return -ENODEV;
77
78 return hvsilib_put_chars(&pv->hvsi, buf, count);
79}
80
81static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
82{
83 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
84 int rc;
85
86 pr_devel("HVSI@%x: do open !\n", hp->vtermno);
87
88 rc = notifier_add_irq(hp, data);
89 if (rc)
90 return rc;
91
92 return hvsilib_open(&pv->hvsi, hp);
93}
94
95static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
96{
97 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
98
99 pr_devel("HVSI@%x: do close !\n", hp->vtermno);
100
101 hvsilib_close(&pv->hvsi, hp);
102
103 notifier_del_irq(hp, data);
104}
105
106void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
107{
108 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
109
110 pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);
111
112 hvsilib_close(&pv->hvsi, hp);
113
114 notifier_hangup_irq(hp, data);
115}
116
117static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
118{
119 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
120
121 if (!pv)
122 return -EINVAL;
123 return pv->hvsi.mctrl;
124}
125
126static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
127 unsigned int clear)
128{
129 struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
130
131 pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
132 hp->vtermno, set, clear);
133
134 if (set & TIOCM_DTR)
135 hvsilib_write_mctrl(&pv->hvsi, 1);
136 else if (clear & TIOCM_DTR)
137 hvsilib_write_mctrl(&pv->hvsi, 0);
138
139 return 0;
140}
141
142static const struct hv_ops hvc_opal_hvsi_ops = {
143 .get_chars = hvc_opal_hvsi_get_chars,
144 .put_chars = hvc_opal_hvsi_put_chars,
145 .flush = opal_flush_chars,
146 .notifier_add = hvc_opal_hvsi_open,
147 .notifier_del = hvc_opal_hvsi_close,
148 .notifier_hangup = hvc_opal_hvsi_hangup,
149 .tiocmget = hvc_opal_hvsi_tiocmget,
150 .tiocmset = hvc_opal_hvsi_tiocmset,
151};
152
153static int hvc_opal_probe(struct platform_device *dev)
154{
155 const struct hv_ops *ops;
156 struct hvc_struct *hp;
157 struct hvc_opal_priv *pv;
158 hv_protocol_t proto;
159 unsigned int termno, irq, boot = 0;
160 const __be32 *reg;
161
162 if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
163 proto = HV_PROTOCOL_RAW;
164 ops = &hvc_opal_raw_ops;
165 } else if (of_device_is_compatible(dev->dev.of_node,
166 "ibm,opal-console-hvsi")) {
167 proto = HV_PROTOCOL_HVSI;
168 ops = &hvc_opal_hvsi_ops;
169 } else {
170 pr_err("hvc_opal: Unknown protocol for %pOF\n",
171 dev->dev.of_node);
172 return -ENXIO;
173 }
174
175 reg = of_get_property(dev->dev.of_node, "reg", NULL);
176 termno = reg ? be32_to_cpup(reg) : 0;
177
178 /* Is it our boot one ? */
179 if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
180 pv = hvc_opal_privs[termno];
181 boot = 1;
182 } else if (hvc_opal_privs[termno] == NULL) {
183 pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
184 if (!pv)
185 return -ENOMEM;
186 pv->proto = proto;
187 hvc_opal_privs[termno] = pv;
188 if (proto == HV_PROTOCOL_HVSI) {
189 /*
190 * We want put_chars to be atomic to avoid mangling of
191 * hvsi packets.
192 */
193 hvsilib_init(&pv->hvsi,
194 opal_get_chars, opal_put_chars_atomic,
195 termno, 0);
196 }
197
198 /* Instanciate now to establish a mapping index==vtermno */
199 hvc_instantiate(termno, termno, ops);
200 } else {
201 pr_err("hvc_opal: Device %pOF has duplicate terminal number #%d\n",
202 dev->dev.of_node, termno);
203 return -ENXIO;
204 }
205
206 pr_info("hvc%d: %s protocol on %pOF%s\n", termno,
207 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
208 dev->dev.of_node,
209 boot ? " (boot console)" : "");
210
211 irq = irq_of_parse_and_map(dev->dev.of_node, 0);
212 if (!irq) {
213 pr_info("hvc%d: No interrupts property, using OPAL event\n",
214 termno);
215 irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
216 }
217
218 if (!irq) {
219 pr_err("hvc_opal: Unable to map interrupt for device %pOF\n",
220 dev->dev.of_node);
221 return irq;
222 }
223
224 hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
225 if (IS_ERR(hp))
226 return PTR_ERR(hp);
227
228 /* hvc consoles on powernv may need to share a single irq */
229 hp->flags = IRQF_SHARED;
230 dev_set_drvdata(&dev->dev, hp);
231
232 return 0;
233}
234
235static int hvc_opal_remove(struct platform_device *dev)
236{
237 struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
238 int rc, termno;
239
240 termno = hp->vtermno;
241 rc = hvc_remove(hp);
242 if (rc == 0) {
243 if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
244 kfree(hvc_opal_privs[termno]);
245 hvc_opal_privs[termno] = NULL;
246 }
247 return rc;
248}
249
250static struct platform_driver hvc_opal_driver = {
251 .probe = hvc_opal_probe,
252 .remove = hvc_opal_remove,
253 .driver = {
254 .name = hvc_opal_name,
255 .of_match_table = hvc_opal_match,
256 }
257};
258
259static int __init hvc_opal_init(void)
260{
261 if (!firmware_has_feature(FW_FEATURE_OPAL))
262 return -ENODEV;
263
264 /* Register as a vio device to receive callbacks */
265 return platform_driver_register(&hvc_opal_driver);
266}
267device_initcall(hvc_opal_init);
268
269static void udbg_opal_putc(char c)
270{
271 unsigned int termno = hvc_opal_boot_termno;
272 int count = -1;
273
274 if (c == '\n')
275 udbg_opal_putc('\r');
276
277 do {
278 switch(hvc_opal_boot_priv.proto) {
279 case HV_PROTOCOL_RAW:
280 count = opal_put_chars(termno, &c, 1);
281 break;
282 case HV_PROTOCOL_HVSI:
283 count = hvc_opal_hvsi_put_chars(termno, &c, 1);
284 break;
285 }
286
287 /* This is needed for the cosole to flush
288 * when there aren't any interrupts.
289 */
290 opal_flush_console(termno);
291 } while(count == 0 || count == -EAGAIN);
292}
293
294static int udbg_opal_getc_poll(void)
295{
296 unsigned int termno = hvc_opal_boot_termno;
297 int rc = 0;
298 char c;
299
300 switch(hvc_opal_boot_priv.proto) {
301 case HV_PROTOCOL_RAW:
302 rc = opal_get_chars(termno, &c, 1);
303 break;
304 case HV_PROTOCOL_HVSI:
305 rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
306 break;
307 }
308 if (!rc)
309 return -1;
310 return c;
311}
312
313static int udbg_opal_getc(void)
314{
315 int ch;
316 for (;;) {
317 ch = udbg_opal_getc_poll();
318 if (ch != -1)
319 return ch;
320 }
321}
322
323static void udbg_init_opal_common(void)
324{
325 udbg_putc = udbg_opal_putc;
326 udbg_getc = udbg_opal_getc;
327 udbg_getc_poll = udbg_opal_getc_poll;
328}
329
330void __init hvc_opal_init_early(void)
331{
332 struct device_node *stdout_node = of_node_get(of_stdout);
333 const __be32 *termno;
334 const struct hv_ops *ops;
335 u32 index;
336
337 /* If the console wasn't in /chosen, try /ibm,opal */
338 if (!stdout_node) {
339 struct device_node *opal, *np;
340
341 /* Current OPAL takeover doesn't provide the stdout
342 * path, so we hard wire it
343 */
344 opal = of_find_node_by_path("/ibm,opal/consoles");
345 if (opal)
346 pr_devel("hvc_opal: Found consoles in new location\n");
347 if (!opal) {
348 opal = of_find_node_by_path("/ibm,opal");
349 if (opal)
350 pr_devel("hvc_opal: "
351 "Found consoles in old location\n");
352 }
353 if (!opal)
354 return;
355 for_each_child_of_node(opal, np) {
356 if (of_node_name_eq(np, "serial")) {
357 stdout_node = np;
358 break;
359 }
360 }
361 of_node_put(opal);
362 }
363 if (!stdout_node)
364 return;
365 termno = of_get_property(stdout_node, "reg", NULL);
366 index = termno ? be32_to_cpup(termno) : 0;
367 if (index >= MAX_NR_HVC_CONSOLES)
368 return;
369 hvc_opal_privs[index] = &hvc_opal_boot_priv;
370
371 /* Check the protocol */
372 if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
373 hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
374 ops = &hvc_opal_raw_ops;
375 pr_devel("hvc_opal: Found RAW console\n");
376 }
377 else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
378 hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
379 ops = &hvc_opal_hvsi_ops;
380 hvsilib_init(&hvc_opal_boot_priv.hvsi,
381 opal_get_chars, opal_put_chars_atomic,
382 index, 1);
383 /* HVSI, perform the handshake now */
384 hvsilib_establish(&hvc_opal_boot_priv.hvsi);
385 pr_devel("hvc_opal: Found HVSI console\n");
386 } else
387 goto out;
388 hvc_opal_boot_termno = index;
389 udbg_init_opal_common();
390 add_preferred_console("hvc", index, NULL);
391 hvc_instantiate(index, index, ops);
392out:
393 of_node_put(stdout_node);
394}
395
396#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
397void __init udbg_init_debug_opal_raw(void)
398{
399 u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
400 hvc_opal_privs[index] = &hvc_opal_boot_priv;
401 hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
402 hvc_opal_boot_termno = index;
403 udbg_init_opal_common();
404}
405#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */
406
407#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
408void __init udbg_init_debug_opal_hvsi(void)
409{
410 u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
411 hvc_opal_privs[index] = &hvc_opal_boot_priv;
412 hvc_opal_boot_termno = index;
413 udbg_init_opal_common();
414 hvsilib_init(&hvc_opal_boot_priv.hvsi,
415 opal_get_chars, opal_put_chars_atomic,
416 index, 1);
417 hvsilib_establish(&hvc_opal_boot_priv.hvsi);
418}
419#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */