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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;
58 struct hvsi_priv hvsi;
59};
60static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
61
62
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
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
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 = irq_of_parse_and_map(dev->dev.of_node, 0);
218 if (!irq) {
219 pr_info("hvc%d: No interrupts property, using OPAL event\n",
220 termno);
221 irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
222 }
223
224 if (!irq) {
225 pr_err("hvc_opal: Unable to map interrupt for device %s\n",
226 dev->dev.of_node->full_name);
227 return irq;
228 }
229
230 hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
231 if (IS_ERR(hp))
232 return PTR_ERR(hp);
233
234
235 hp->flags = IRQF_SHARED;
236 dev_set_drvdata(&dev->dev, hp);
237
238 return 0;
239}
240
241static int hvc_opal_remove(struct platform_device *dev)
242{
243 struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
244 int rc, termno;
245
246 termno = hp->vtermno;
247 rc = hvc_remove(hp);
248 if (rc == 0) {
249 if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
250 kfree(hvc_opal_privs[termno]);
251 hvc_opal_privs[termno] = NULL;
252 }
253 return rc;
254}
255
256static struct platform_driver hvc_opal_driver = {
257 .probe = hvc_opal_probe,
258 .remove = hvc_opal_remove,
259 .driver = {
260 .name = hvc_opal_name,
261 .of_match_table = hvc_opal_match,
262 }
263};
264
265static int __init hvc_opal_init(void)
266{
267 if (!firmware_has_feature(FW_FEATURE_OPAL))
268 return -ENODEV;
269
270
271 return platform_driver_register(&hvc_opal_driver);
272}
273device_initcall(hvc_opal_init);
274
275static void udbg_opal_putc(char c)
276{
277 unsigned int termno = hvc_opal_boot_termno;
278 int count = -1;
279
280 if (c == '\n')
281 udbg_opal_putc('\r');
282
283 do {
284 switch(hvc_opal_boot_priv.proto) {
285 case HV_PROTOCOL_RAW:
286 count = opal_put_chars(termno, &c, 1);
287 break;
288 case HV_PROTOCOL_HVSI:
289 count = hvc_opal_hvsi_put_chars(termno, &c, 1);
290 break;
291 }
292 } while(count == 0 || count == -EAGAIN);
293}
294
295static int udbg_opal_getc_poll(void)
296{
297 unsigned int termno = hvc_opal_boot_termno;
298 int rc = 0;
299 char c;
300
301 switch(hvc_opal_boot_priv.proto) {
302 case HV_PROTOCOL_RAW:
303 rc = opal_get_chars(termno, &c, 1);
304 break;
305 case HV_PROTOCOL_HVSI:
306 rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
307 break;
308 }
309 if (!rc)
310 return -1;
311 return c;
312}
313
314static int udbg_opal_getc(void)
315{
316 int ch;
317 for (;;) {
318 ch = udbg_opal_getc_poll();
319 if (ch == -1) {
320
321 volatile unsigned long delay;
322 for (delay=0; delay < 2000000; delay++)
323 ;
324 } else {
325 return ch;
326 }
327 }
328}
329
330static void udbg_init_opal_common(void)
331{
332 udbg_putc = udbg_opal_putc;
333 udbg_getc = udbg_opal_getc;
334 udbg_getc_poll = udbg_opal_getc_poll;
335 tb_ticks_per_usec = 0x200;
336}
337
338void __init hvc_opal_init_early(void)
339{
340 struct device_node *stdout_node = of_node_get(of_stdout);
341 const __be32 *termno;
342 const struct hv_ops *ops;
343 u32 index;
344
345
346 if (!stdout_node) {
347 struct device_node *opal, *np;
348
349
350
351
352 opal = of_find_node_by_path("/ibm,opal/consoles");
353 if (opal)
354 pr_devel("hvc_opal: Found consoles in new location\n");
355 if (!opal) {
356 opal = of_find_node_by_path("/ibm,opal");
357 if (opal)
358 pr_devel("hvc_opal: "
359 "Found consoles in old location\n");
360 }
361 if (!opal)
362 return;
363 for_each_child_of_node(opal, np) {
364 if (!strcmp(np->name, "serial")) {
365 stdout_node = np;
366 break;
367 }
368 }
369 of_node_put(opal);
370 }
371 if (!stdout_node)
372 return;
373 termno = of_get_property(stdout_node, "reg", NULL);
374 index = termno ? be32_to_cpup(termno) : 0;
375 if (index >= MAX_NR_HVC_CONSOLES)
376 return;
377 hvc_opal_privs[index] = &hvc_opal_boot_priv;
378
379
380 if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
381 hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
382 ops = &hvc_opal_raw_ops;
383 pr_devel("hvc_opal: Found RAW console\n");
384 }
385 else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
386 hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
387 ops = &hvc_opal_hvsi_ops;
388 hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars,
389 opal_put_chars, index, 1);
390
391 hvsilib_establish(&hvc_opal_boot_priv.hvsi);
392 pr_devel("hvc_opal: Found HVSI console\n");
393 } else
394 goto out;
395 hvc_opal_boot_termno = index;
396 udbg_init_opal_common();
397 add_preferred_console("hvc", index, NULL);
398 hvc_instantiate(index, index, ops);
399out:
400 of_node_put(stdout_node);
401}
402
403#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
404void __init udbg_init_debug_opal_raw(void)
405{
406 u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
407 hvc_opal_privs[index] = &hvc_opal_boot_priv;
408 hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
409 hvc_opal_boot_termno = index;
410 udbg_init_opal_common();
411}
412#endif
413
414#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
415void __init udbg_init_debug_opal_hvsi(void)
416{
417 u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
418 hvc_opal_privs[index] = &hvc_opal_boot_priv;
419 hvc_opal_boot_termno = index;
420 udbg_init_opal_common();
421 hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars, opal_put_chars,
422 index, 1);
423 hvsilib_establish(&hvc_opal_boot_priv.hvsi);
424}
425#endif
426
