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daea1175 BH |
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> | |
0084e475 | 31 | #include <linux/export.h> |
daea1175 BH |
32 | |
33 | #include <asm/hvconsole.h> | |
34 | #include <asm/prom.h> | |
35 | #include <asm/firmware.h> | |
36 | #include <asm/hvsi.h> | |
37 | #include <asm/udbg.h> | |
38 | #include <asm/opal.h> | |
39 | ||
40 | #include "hvc_console.h" | |
41 | ||
42 | static const char hvc_opal_name[] = "hvc_opal"; | |
43 | ||
44 | static struct of_device_id hvc_opal_match[] __devinitdata = { | |
45 | { .name = "serial", .compatible = "ibm,opal-console-raw" }, | |
46 | { .name = "serial", .compatible = "ibm,opal-console-hvsi" }, | |
47 | { }, | |
48 | }; | |
49 | ||
50 | typedef enum hv_protocol { | |
51 | HV_PROTOCOL_RAW, | |
52 | HV_PROTOCOL_HVSI | |
53 | } hv_protocol_t; | |
54 | ||
55 | struct hvc_opal_priv { | |
56 | hv_protocol_t proto; /* Raw data or HVSI packets */ | |
57 | struct hvsi_priv hvsi; /* HVSI specific data */ | |
58 | }; | |
59 | static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES]; | |
60 | ||
61 | /* For early boot console */ | |
62 | static struct hvc_opal_priv hvc_opal_boot_priv; | |
63 | static u32 hvc_opal_boot_termno; | |
64 | ||
65 | static const struct hv_ops hvc_opal_raw_ops = { | |
66 | .get_chars = opal_get_chars, | |
67 | .put_chars = opal_put_chars, | |
68 | .notifier_add = notifier_add_irq, | |
69 | .notifier_del = notifier_del_irq, | |
70 | .notifier_hangup = notifier_hangup_irq, | |
71 | }; | |
72 | ||
73 | static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count) | |
74 | { | |
75 | struct hvc_opal_priv *pv = hvc_opal_privs[vtermno]; | |
76 | ||
77 | if (WARN_ON(!pv)) | |
78 | return -ENODEV; | |
79 | ||
80 | return hvsilib_get_chars(&pv->hvsi, buf, count); | |
81 | } | |
82 | ||
83 | static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count) | |
84 | { | |
85 | struct hvc_opal_priv *pv = hvc_opal_privs[vtermno]; | |
86 | ||
87 | if (WARN_ON(!pv)) | |
88 | return -ENODEV; | |
89 | ||
90 | return hvsilib_put_chars(&pv->hvsi, buf, count); | |
91 | } | |
92 | ||
93 | static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data) | |
94 | { | |
95 | struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; | |
96 | int rc; | |
97 | ||
98 | pr_devel("HVSI@%x: do open !\n", hp->vtermno); | |
99 | ||
100 | rc = notifier_add_irq(hp, data); | |
101 | if (rc) | |
102 | return rc; | |
103 | ||
104 | return hvsilib_open(&pv->hvsi, hp); | |
105 | } | |
106 | ||
107 | static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data) | |
108 | { | |
109 | struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; | |
110 | ||
111 | pr_devel("HVSI@%x: do close !\n", hp->vtermno); | |
112 | ||
113 | hvsilib_close(&pv->hvsi, hp); | |
114 | ||
115 | notifier_del_irq(hp, data); | |
116 | } | |
117 | ||
118 | void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data) | |
119 | { | |
120 | struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; | |
121 | ||
122 | pr_devel("HVSI@%x: do hangup !\n", hp->vtermno); | |
123 | ||
124 | hvsilib_close(&pv->hvsi, hp); | |
125 | ||
126 | notifier_hangup_irq(hp, data); | |
127 | } | |
128 | ||
129 | static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp) | |
130 | { | |
131 | struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; | |
132 | ||
133 | if (!pv) | |
134 | return -EINVAL; | |
135 | return pv->hvsi.mctrl; | |
136 | } | |
137 | ||
138 | static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set, | |
139 | unsigned int clear) | |
140 | { | |
141 | struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; | |
142 | ||
143 | pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n", | |
144 | hp->vtermno, set, clear); | |
145 | ||
146 | if (set & TIOCM_DTR) | |
147 | hvsilib_write_mctrl(&pv->hvsi, 1); | |
148 | else if (clear & TIOCM_DTR) | |
149 | hvsilib_write_mctrl(&pv->hvsi, 0); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static const struct hv_ops hvc_opal_hvsi_ops = { | |
155 | .get_chars = hvc_opal_hvsi_get_chars, | |
156 | .put_chars = hvc_opal_hvsi_put_chars, | |
157 | .notifier_add = hvc_opal_hvsi_open, | |
158 | .notifier_del = hvc_opal_hvsi_close, | |
159 | .notifier_hangup = hvc_opal_hvsi_hangup, | |
160 | .tiocmget = hvc_opal_hvsi_tiocmget, | |
161 | .tiocmset = hvc_opal_hvsi_tiocmset, | |
162 | }; | |
163 | ||
164 | static int __devinit hvc_opal_probe(struct platform_device *dev) | |
165 | { | |
166 | const struct hv_ops *ops; | |
167 | struct hvc_struct *hp; | |
168 | struct hvc_opal_priv *pv; | |
169 | hv_protocol_t proto; | |
170 | unsigned int termno, boot = 0; | |
171 | const __be32 *reg; | |
172 | ||
173 | if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) { | |
174 | proto = HV_PROTOCOL_RAW; | |
175 | ops = &hvc_opal_raw_ops; | |
176 | } else if (of_device_is_compatible(dev->dev.of_node, | |
177 | "ibm,opal-console-hvsi")) { | |
178 | proto = HV_PROTOCOL_HVSI; | |
179 | ops = &hvc_opal_hvsi_ops; | |
180 | } else { | |
181 | pr_err("hvc_opal: Unkown protocol for %s\n", | |
182 | dev->dev.of_node->full_name); | |
183 | return -ENXIO; | |
184 | } | |
185 | ||
186 | reg = of_get_property(dev->dev.of_node, "reg", NULL); | |
187 | termno = reg ? be32_to_cpup(reg) : 0; | |
188 | ||
189 | /* Is it our boot one ? */ | |
190 | if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) { | |
191 | pv = hvc_opal_privs[termno]; | |
192 | boot = 1; | |
193 | } else if (hvc_opal_privs[termno] == NULL) { | |
194 | pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL); | |
195 | if (!pv) | |
196 | return -ENOMEM; | |
197 | pv->proto = proto; | |
198 | hvc_opal_privs[termno] = pv; | |
199 | if (proto == HV_PROTOCOL_HVSI) | |
200 | hvsilib_init(&pv->hvsi, opal_get_chars, opal_put_chars, | |
201 | termno, 0); | |
202 | ||
203 | /* Instanciate now to establish a mapping index==vtermno */ | |
204 | hvc_instantiate(termno, termno, ops); | |
205 | } else { | |
206 | pr_err("hvc_opal: Device %s has duplicate terminal number #%d\n", | |
207 | dev->dev.of_node->full_name, termno); | |
208 | return -ENXIO; | |
209 | } | |
210 | ||
211 | pr_info("hvc%d: %s protocol on %s%s\n", termno, | |
212 | proto == HV_PROTOCOL_RAW ? "raw" : "hvsi", | |
213 | dev->dev.of_node->full_name, | |
214 | boot ? " (boot console)" : ""); | |
215 | ||
216 | /* We don't do IRQ yet */ | |
217 | hp = hvc_alloc(termno, 0, ops, MAX_VIO_PUT_CHARS); | |
218 | if (IS_ERR(hp)) | |
219 | return PTR_ERR(hp); | |
220 | dev_set_drvdata(&dev->dev, hp); | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static int __devexit hvc_opal_remove(struct platform_device *dev) | |
226 | { | |
227 | struct hvc_struct *hp = dev_get_drvdata(&dev->dev); | |
228 | int rc, termno; | |
229 | ||
230 | termno = hp->vtermno; | |
231 | rc = hvc_remove(hp); | |
232 | if (rc == 0) { | |
233 | if (hvc_opal_privs[termno] != &hvc_opal_boot_priv) | |
234 | kfree(hvc_opal_privs[termno]); | |
235 | hvc_opal_privs[termno] = NULL; | |
236 | } | |
237 | return rc; | |
238 | } | |
239 | ||
240 | static struct platform_driver hvc_opal_driver = { | |
241 | .probe = hvc_opal_probe, | |
242 | .remove = __devexit_p(hvc_opal_remove), | |
243 | .driver = { | |
244 | .name = hvc_opal_name, | |
245 | .owner = THIS_MODULE, | |
246 | .of_match_table = hvc_opal_match, | |
247 | } | |
248 | }; | |
249 | ||
250 | static int __init hvc_opal_init(void) | |
251 | { | |
252 | if (!firmware_has_feature(FW_FEATURE_OPAL)) | |
253 | return -ENODEV; | |
254 | ||
255 | /* Register as a vio device to receive callbacks */ | |
256 | return platform_driver_register(&hvc_opal_driver); | |
257 | } | |
258 | module_init(hvc_opal_init); | |
259 | ||
260 | static void __exit hvc_opal_exit(void) | |
261 | { | |
262 | platform_driver_unregister(&hvc_opal_driver); | |
263 | } | |
264 | module_exit(hvc_opal_exit); | |
265 | ||
266 | static 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 | ||
286 | static 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 | ||
305 | static 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 | ||
321 | static 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 | ||
329 | void __init hvc_opal_init_early(void) | |
330 | { | |
331 | struct device_node *stdout_node = NULL; | |
332 | const u32 *termno; | |
333 | const char *name = NULL; | |
334 | const struct hv_ops *ops; | |
335 | u32 index; | |
336 | ||
337 | /* find the boot console from /chosen/stdout */ | |
338 | if (of_chosen) | |
339 | name = of_get_property(of_chosen, "linux,stdout-path", NULL); | |
340 | if (name) { | |
341 | stdout_node = of_find_node_by_path(name); | |
342 | if (!stdout_node) { | |
343 | pr_err("hvc_opal: Failed to locate default console!\n"); | |
344 | return; | |
345 | } | |
346 | } else { | |
347 | struct device_node *opal, *np; | |
348 | ||
349 | /* Current OPAL takeover doesn't provide the stdout | |
350 | * path, so we hard wire it | |
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 ? *termno : 0; | |
375 | if (index >= MAX_NR_HVC_CONSOLES) | |
376 | return; | |
377 | hvc_opal_privs[index] = &hvc_opal_boot_priv; | |
378 | ||
379 | /* Check the protocol */ | |
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 | /* HVSI, perform the handshake now */ | |
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); | |
399 | out: | |
400 | of_node_put(stdout_node); | |
401 | } | |
402 | ||
403 | #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW | |
50fb31cf | 404 | void __init udbg_init_debug_opal_raw(void) |
daea1175 BH |
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 /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */ | |
413 | ||
414 | #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI | |
415 | void __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 /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */ |