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bff60792 MR |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * Copyright (C) 2015 ARM Limited | |
12 | */ | |
13 | ||
14 | #define pr_fmt(fmt) "psci: " fmt | |
15 | ||
e679660d | 16 | #include <linux/arm-smccc.h> |
8b6f2499 | 17 | #include <linux/cpuidle.h> |
bff60792 MR |
18 | #include <linux/errno.h> |
19 | #include <linux/linkage.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/pm.h> | |
22 | #include <linux/printk.h> | |
23 | #include <linux/psci.h> | |
24 | #include <linux/reboot.h> | |
8b6f2499 | 25 | #include <linux/slab.h> |
faf7ec4a | 26 | #include <linux/suspend.h> |
bff60792 MR |
27 | |
28 | #include <uapi/linux/psci.h> | |
29 | ||
8b6f2499 | 30 | #include <asm/cpuidle.h> |
bff60792 MR |
31 | #include <asm/cputype.h> |
32 | #include <asm/system_misc.h> | |
33 | #include <asm/smp_plat.h> | |
faf7ec4a | 34 | #include <asm/suspend.h> |
bff60792 | 35 | |
5211df00 MR |
36 | /* |
37 | * While a 64-bit OS can make calls with SMC32 calling conventions, for some | |
029180b1 SH |
38 | * calls it is necessary to use SMC64 to pass or return 64-bit values. |
39 | * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate | |
40 | * (native-width) function ID. | |
5211df00 MR |
41 | */ |
42 | #ifdef CONFIG_64BIT | |
029180b1 | 43 | #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name |
5211df00 | 44 | #else |
029180b1 | 45 | #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name |
5211df00 MR |
46 | #endif |
47 | ||
bff60792 MR |
48 | /* |
49 | * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF | |
50 | * calls to its resident CPU, so we must avoid issuing those. We never migrate | |
51 | * a Trusted OS even if it claims to be capable of migration -- doing so will | |
52 | * require cooperation with a Trusted OS driver. | |
53 | */ | |
54 | static int resident_cpu = -1; | |
55 | ||
56 | bool psci_tos_resident_on(int cpu) | |
57 | { | |
58 | return cpu == resident_cpu; | |
59 | } | |
60 | ||
61 | struct psci_operations psci_ops; | |
62 | ||
63 | typedef unsigned long (psci_fn)(unsigned long, unsigned long, | |
64 | unsigned long, unsigned long); | |
bff60792 MR |
65 | static psci_fn *invoke_psci_fn; |
66 | ||
67 | enum psci_function { | |
68 | PSCI_FN_CPU_SUSPEND, | |
69 | PSCI_FN_CPU_ON, | |
70 | PSCI_FN_CPU_OFF, | |
71 | PSCI_FN_MIGRATE, | |
72 | PSCI_FN_MAX, | |
73 | }; | |
74 | ||
75 | static u32 psci_function_id[PSCI_FN_MAX]; | |
76 | ||
068654c2 LP |
77 | #define PSCI_0_2_POWER_STATE_MASK \ |
78 | (PSCI_0_2_POWER_STATE_ID_MASK | \ | |
79 | PSCI_0_2_POWER_STATE_TYPE_MASK | \ | |
80 | PSCI_0_2_POWER_STATE_AFFL_MASK) | |
81 | ||
a5c00bb2 LP |
82 | #define PSCI_1_0_EXT_POWER_STATE_MASK \ |
83 | (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \ | |
84 | PSCI_1_0_EXT_POWER_STATE_TYPE_MASK) | |
85 | ||
86 | static u32 psci_cpu_suspend_feature; | |
87 | ||
88 | static inline bool psci_has_ext_power_state(void) | |
89 | { | |
90 | return psci_cpu_suspend_feature & | |
91 | PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK; | |
92 | } | |
93 | ||
2b9cf189 | 94 | static inline bool psci_power_state_loses_context(u32 state) |
068654c2 | 95 | { |
a5c00bb2 LP |
96 | const u32 mask = psci_has_ext_power_state() ? |
97 | PSCI_1_0_EXT_POWER_STATE_TYPE_MASK : | |
98 | PSCI_0_2_POWER_STATE_TYPE_MASK; | |
99 | ||
100 | return state & mask; | |
068654c2 LP |
101 | } |
102 | ||
2b9cf189 | 103 | static inline bool psci_power_state_is_valid(u32 state) |
068654c2 | 104 | { |
a5c00bb2 LP |
105 | const u32 valid_mask = psci_has_ext_power_state() ? |
106 | PSCI_1_0_EXT_POWER_STATE_MASK : | |
107 | PSCI_0_2_POWER_STATE_MASK; | |
108 | ||
109 | return !(state & ~valid_mask); | |
068654c2 LP |
110 | } |
111 | ||
e679660d JW |
112 | static unsigned long __invoke_psci_fn_hvc(unsigned long function_id, |
113 | unsigned long arg0, unsigned long arg1, | |
114 | unsigned long arg2) | |
115 | { | |
116 | struct arm_smccc_res res; | |
117 | ||
118 | arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
119 | return res.a0; | |
120 | } | |
121 | ||
122 | static unsigned long __invoke_psci_fn_smc(unsigned long function_id, | |
123 | unsigned long arg0, unsigned long arg1, | |
124 | unsigned long arg2) | |
125 | { | |
126 | struct arm_smccc_res res; | |
127 | ||
128 | arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
129 | return res.a0; | |
130 | } | |
131 | ||
bff60792 MR |
132 | static int psci_to_linux_errno(int errno) |
133 | { | |
134 | switch (errno) { | |
135 | case PSCI_RET_SUCCESS: | |
136 | return 0; | |
137 | case PSCI_RET_NOT_SUPPORTED: | |
138 | return -EOPNOTSUPP; | |
139 | case PSCI_RET_INVALID_PARAMS: | |
2217d7c6 | 140 | case PSCI_RET_INVALID_ADDRESS: |
bff60792 MR |
141 | return -EINVAL; |
142 | case PSCI_RET_DENIED: | |
143 | return -EPERM; | |
144 | }; | |
145 | ||
146 | return -EINVAL; | |
147 | } | |
148 | ||
149 | static u32 psci_get_version(void) | |
150 | { | |
151 | return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); | |
152 | } | |
153 | ||
154 | static int psci_cpu_suspend(u32 state, unsigned long entry_point) | |
155 | { | |
156 | int err; | |
157 | u32 fn; | |
158 | ||
159 | fn = psci_function_id[PSCI_FN_CPU_SUSPEND]; | |
160 | err = invoke_psci_fn(fn, state, entry_point, 0); | |
161 | return psci_to_linux_errno(err); | |
162 | } | |
163 | ||
164 | static int psci_cpu_off(u32 state) | |
165 | { | |
166 | int err; | |
167 | u32 fn; | |
168 | ||
169 | fn = psci_function_id[PSCI_FN_CPU_OFF]; | |
170 | err = invoke_psci_fn(fn, state, 0, 0); | |
171 | return psci_to_linux_errno(err); | |
172 | } | |
173 | ||
174 | static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point) | |
175 | { | |
176 | int err; | |
177 | u32 fn; | |
178 | ||
179 | fn = psci_function_id[PSCI_FN_CPU_ON]; | |
180 | err = invoke_psci_fn(fn, cpuid, entry_point, 0); | |
181 | return psci_to_linux_errno(err); | |
182 | } | |
183 | ||
184 | static int psci_migrate(unsigned long cpuid) | |
185 | { | |
186 | int err; | |
187 | u32 fn; | |
188 | ||
189 | fn = psci_function_id[PSCI_FN_MIGRATE]; | |
190 | err = invoke_psci_fn(fn, cpuid, 0, 0); | |
191 | return psci_to_linux_errno(err); | |
192 | } | |
193 | ||
194 | static int psci_affinity_info(unsigned long target_affinity, | |
195 | unsigned long lowest_affinity_level) | |
196 | { | |
029180b1 | 197 | return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO), |
5211df00 | 198 | target_affinity, lowest_affinity_level, 0); |
bff60792 MR |
199 | } |
200 | ||
201 | static int psci_migrate_info_type(void) | |
202 | { | |
203 | return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0); | |
204 | } | |
205 | ||
206 | static unsigned long psci_migrate_info_up_cpu(void) | |
207 | { | |
029180b1 | 208 | return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU), |
5211df00 | 209 | 0, 0, 0); |
bff60792 MR |
210 | } |
211 | ||
212 | static int get_set_conduit_method(struct device_node *np) | |
213 | { | |
214 | const char *method; | |
215 | ||
216 | pr_info("probing for conduit method from DT.\n"); | |
217 | ||
218 | if (of_property_read_string(np, "method", &method)) { | |
219 | pr_warn("missing \"method\" property\n"); | |
220 | return -ENXIO; | |
221 | } | |
222 | ||
223 | if (!strcmp("hvc", method)) { | |
224 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
225 | } else if (!strcmp("smc", method)) { | |
226 | invoke_psci_fn = __invoke_psci_fn_smc; | |
227 | } else { | |
228 | pr_warn("invalid \"method\" property: %s\n", method); | |
229 | return -EINVAL; | |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) | |
235 | { | |
236 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); | |
237 | } | |
238 | ||
239 | static void psci_sys_poweroff(void) | |
240 | { | |
241 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); | |
242 | } | |
243 | ||
5f004e0c LP |
244 | static int __init psci_features(u32 psci_func_id) |
245 | { | |
246 | return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, | |
247 | psci_func_id, 0, 0); | |
248 | } | |
249 | ||
8b6f2499 LP |
250 | #ifdef CONFIG_CPU_IDLE |
251 | static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state); | |
252 | ||
253 | static int psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu) | |
254 | { | |
255 | int i, ret, count = 0; | |
256 | u32 *psci_states; | |
257 | struct device_node *state_node; | |
258 | ||
259 | /* | |
260 | * If the PSCI cpu_suspend function hook has not been initialized | |
261 | * idle states must not be enabled, so bail out | |
262 | */ | |
263 | if (!psci_ops.cpu_suspend) | |
264 | return -EOPNOTSUPP; | |
265 | ||
266 | /* Count idle states */ | |
267 | while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states", | |
268 | count))) { | |
269 | count++; | |
270 | of_node_put(state_node); | |
271 | } | |
272 | ||
273 | if (!count) | |
274 | return -ENODEV; | |
275 | ||
276 | psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL); | |
277 | if (!psci_states) | |
278 | return -ENOMEM; | |
279 | ||
280 | for (i = 0; i < count; i++) { | |
281 | u32 state; | |
282 | ||
283 | state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i); | |
284 | ||
285 | ret = of_property_read_u32(state_node, | |
286 | "arm,psci-suspend-param", | |
287 | &state); | |
288 | if (ret) { | |
289 | pr_warn(" * %s missing arm,psci-suspend-param property\n", | |
290 | state_node->full_name); | |
291 | of_node_put(state_node); | |
292 | goto free_mem; | |
293 | } | |
294 | ||
295 | of_node_put(state_node); | |
296 | pr_debug("psci-power-state %#x index %d\n", state, i); | |
297 | if (!psci_power_state_is_valid(state)) { | |
298 | pr_warn("Invalid PSCI power state %#x\n", state); | |
299 | ret = -EINVAL; | |
300 | goto free_mem; | |
301 | } | |
302 | psci_states[i] = state; | |
303 | } | |
304 | /* Idle states parsed correctly, initialize per-cpu pointer */ | |
305 | per_cpu(psci_power_state, cpu) = psci_states; | |
306 | return 0; | |
307 | ||
308 | free_mem: | |
309 | kfree(psci_states); | |
310 | return ret; | |
311 | } | |
312 | ||
313 | int psci_cpu_init_idle(unsigned int cpu) | |
314 | { | |
315 | struct device_node *cpu_node; | |
316 | int ret; | |
317 | ||
318 | cpu_node = of_get_cpu_node(cpu, NULL); | |
319 | if (!cpu_node) | |
320 | return -ENODEV; | |
321 | ||
322 | ret = psci_dt_cpu_init_idle(cpu_node, cpu); | |
323 | ||
324 | of_node_put(cpu_node); | |
325 | ||
326 | return ret; | |
327 | } | |
328 | ||
329 | static int psci_suspend_finisher(unsigned long index) | |
330 | { | |
331 | u32 *state = __this_cpu_read(psci_power_state); | |
332 | ||
333 | return psci_ops.cpu_suspend(state[index - 1], | |
334 | virt_to_phys(cpu_resume)); | |
335 | } | |
336 | ||
337 | int psci_cpu_suspend_enter(unsigned long index) | |
338 | { | |
339 | int ret; | |
340 | u32 *state = __this_cpu_read(psci_power_state); | |
341 | /* | |
342 | * idle state index 0 corresponds to wfi, should never be called | |
343 | * from the cpu_suspend operations | |
344 | */ | |
345 | if (WARN_ON_ONCE(!index)) | |
346 | return -EINVAL; | |
347 | ||
348 | if (!psci_power_state_loses_context(state[index - 1])) | |
349 | ret = psci_ops.cpu_suspend(state[index - 1], 0); | |
350 | else | |
351 | ret = cpu_suspend(index, psci_suspend_finisher); | |
352 | ||
353 | return ret; | |
354 | } | |
355 | ||
356 | /* ARM specific CPU idle operations */ | |
357 | #ifdef CONFIG_ARM | |
5e7c17df | 358 | static const struct cpuidle_ops psci_cpuidle_ops __initconst = { |
8b6f2499 LP |
359 | .suspend = psci_cpu_suspend_enter, |
360 | .init = psci_dt_cpu_init_idle, | |
361 | }; | |
362 | ||
978fa436 | 363 | CPUIDLE_METHOD_OF_DECLARE(psci, "psci", &psci_cpuidle_ops); |
8b6f2499 LP |
364 | #endif |
365 | #endif | |
366 | ||
faf7ec4a SH |
367 | static int psci_system_suspend(unsigned long unused) |
368 | { | |
369 | return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND), | |
370 | virt_to_phys(cpu_resume), 0, 0); | |
371 | } | |
372 | ||
373 | static int psci_system_suspend_enter(suspend_state_t state) | |
374 | { | |
375 | return cpu_suspend(0, psci_system_suspend); | |
376 | } | |
377 | ||
378 | static const struct platform_suspend_ops psci_suspend_ops = { | |
379 | .valid = suspend_valid_only_mem, | |
380 | .enter = psci_system_suspend_enter, | |
381 | }; | |
382 | ||
383 | static void __init psci_init_system_suspend(void) | |
384 | { | |
385 | int ret; | |
386 | ||
387 | if (!IS_ENABLED(CONFIG_SUSPEND)) | |
388 | return; | |
389 | ||
390 | ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND)); | |
391 | ||
392 | if (ret != PSCI_RET_NOT_SUPPORTED) | |
393 | suspend_set_ops(&psci_suspend_ops); | |
394 | } | |
395 | ||
a5c00bb2 LP |
396 | static void __init psci_init_cpu_suspend(void) |
397 | { | |
398 | int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]); | |
399 | ||
400 | if (feature != PSCI_RET_NOT_SUPPORTED) | |
401 | psci_cpu_suspend_feature = feature; | |
402 | } | |
403 | ||
bff60792 MR |
404 | /* |
405 | * Detect the presence of a resident Trusted OS which may cause CPU_OFF to | |
406 | * return DENIED (which would be fatal). | |
407 | */ | |
408 | static void __init psci_init_migrate(void) | |
409 | { | |
410 | unsigned long cpuid; | |
411 | int type, cpu = -1; | |
412 | ||
413 | type = psci_ops.migrate_info_type(); | |
414 | ||
415 | if (type == PSCI_0_2_TOS_MP) { | |
416 | pr_info("Trusted OS migration not required\n"); | |
417 | return; | |
418 | } | |
419 | ||
420 | if (type == PSCI_RET_NOT_SUPPORTED) { | |
421 | pr_info("MIGRATE_INFO_TYPE not supported.\n"); | |
422 | return; | |
423 | } | |
424 | ||
425 | if (type != PSCI_0_2_TOS_UP_MIGRATE && | |
426 | type != PSCI_0_2_TOS_UP_NO_MIGRATE) { | |
427 | pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type); | |
428 | return; | |
429 | } | |
430 | ||
431 | cpuid = psci_migrate_info_up_cpu(); | |
432 | if (cpuid & ~MPIDR_HWID_BITMASK) { | |
433 | pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n", | |
434 | cpuid); | |
435 | return; | |
436 | } | |
437 | ||
438 | cpu = get_logical_index(cpuid); | |
439 | resident_cpu = cpu >= 0 ? cpu : -1; | |
440 | ||
441 | pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid); | |
442 | } | |
443 | ||
444 | static void __init psci_0_2_set_functions(void) | |
445 | { | |
446 | pr_info("Using standard PSCI v0.2 function IDs\n"); | |
029180b1 SH |
447 | psci_function_id[PSCI_FN_CPU_SUSPEND] = |
448 | PSCI_FN_NATIVE(0_2, CPU_SUSPEND); | |
bff60792 MR |
449 | psci_ops.cpu_suspend = psci_cpu_suspend; |
450 | ||
451 | psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF; | |
452 | psci_ops.cpu_off = psci_cpu_off; | |
453 | ||
029180b1 | 454 | psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON); |
bff60792 MR |
455 | psci_ops.cpu_on = psci_cpu_on; |
456 | ||
029180b1 | 457 | psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE); |
bff60792 MR |
458 | psci_ops.migrate = psci_migrate; |
459 | ||
460 | psci_ops.affinity_info = psci_affinity_info; | |
461 | ||
462 | psci_ops.migrate_info_type = psci_migrate_info_type; | |
463 | ||
464 | arm_pm_restart = psci_sys_reset; | |
465 | ||
466 | pm_power_off = psci_sys_poweroff; | |
467 | } | |
468 | ||
469 | /* | |
470 | * Probe function for PSCI firmware versions >= 0.2 | |
471 | */ | |
472 | static int __init psci_probe(void) | |
473 | { | |
474 | u32 ver = psci_get_version(); | |
475 | ||
476 | pr_info("PSCIv%d.%d detected in firmware.\n", | |
477 | PSCI_VERSION_MAJOR(ver), | |
478 | PSCI_VERSION_MINOR(ver)); | |
479 | ||
480 | if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) { | |
481 | pr_err("Conflicting PSCI version detected.\n"); | |
482 | return -EINVAL; | |
483 | } | |
484 | ||
485 | psci_0_2_set_functions(); | |
486 | ||
487 | psci_init_migrate(); | |
488 | ||
79b04beb LP |
489 | if (PSCI_VERSION_MAJOR(ver) >= 1) { |
490 | psci_init_cpu_suspend(); | |
491 | psci_init_system_suspend(); | |
492 | } | |
faf7ec4a | 493 | |
bff60792 MR |
494 | return 0; |
495 | } | |
496 | ||
497 | typedef int (*psci_initcall_t)(const struct device_node *); | |
498 | ||
499 | /* | |
500 | * PSCI init function for PSCI versions >=0.2 | |
501 | * | |
502 | * Probe based on PSCI PSCI_VERSION function | |
503 | */ | |
504 | static int __init psci_0_2_init(struct device_node *np) | |
505 | { | |
506 | int err; | |
507 | ||
508 | err = get_set_conduit_method(np); | |
509 | ||
510 | if (err) | |
511 | goto out_put_node; | |
512 | /* | |
513 | * Starting with v0.2, the PSCI specification introduced a call | |
514 | * (PSCI_VERSION) that allows probing the firmware version, so | |
515 | * that PSCI function IDs and version specific initialization | |
516 | * can be carried out according to the specific version reported | |
517 | * by firmware | |
518 | */ | |
519 | err = psci_probe(); | |
520 | ||
521 | out_put_node: | |
522 | of_node_put(np); | |
523 | return err; | |
524 | } | |
525 | ||
526 | /* | |
527 | * PSCI < v0.2 get PSCI Function IDs via DT. | |
528 | */ | |
529 | static int __init psci_0_1_init(struct device_node *np) | |
530 | { | |
531 | u32 id; | |
532 | int err; | |
533 | ||
534 | err = get_set_conduit_method(np); | |
535 | ||
536 | if (err) | |
537 | goto out_put_node; | |
538 | ||
539 | pr_info("Using PSCI v0.1 Function IDs from DT\n"); | |
540 | ||
541 | if (!of_property_read_u32(np, "cpu_suspend", &id)) { | |
542 | psci_function_id[PSCI_FN_CPU_SUSPEND] = id; | |
543 | psci_ops.cpu_suspend = psci_cpu_suspend; | |
544 | } | |
545 | ||
546 | if (!of_property_read_u32(np, "cpu_off", &id)) { | |
547 | psci_function_id[PSCI_FN_CPU_OFF] = id; | |
548 | psci_ops.cpu_off = psci_cpu_off; | |
549 | } | |
550 | ||
551 | if (!of_property_read_u32(np, "cpu_on", &id)) { | |
552 | psci_function_id[PSCI_FN_CPU_ON] = id; | |
553 | psci_ops.cpu_on = psci_cpu_on; | |
554 | } | |
555 | ||
556 | if (!of_property_read_u32(np, "migrate", &id)) { | |
557 | psci_function_id[PSCI_FN_MIGRATE] = id; | |
558 | psci_ops.migrate = psci_migrate; | |
559 | } | |
560 | ||
561 | out_put_node: | |
562 | of_node_put(np); | |
563 | return err; | |
564 | } | |
565 | ||
1d2d8de4 | 566 | static const struct of_device_id psci_of_match[] __initconst = { |
bff60792 MR |
567 | { .compatible = "arm,psci", .data = psci_0_1_init}, |
568 | { .compatible = "arm,psci-0.2", .data = psci_0_2_init}, | |
0fc197c7 | 569 | { .compatible = "arm,psci-1.0", .data = psci_0_2_init}, |
bff60792 MR |
570 | {}, |
571 | }; | |
572 | ||
573 | int __init psci_dt_init(void) | |
574 | { | |
575 | struct device_node *np; | |
576 | const struct of_device_id *matched_np; | |
577 | psci_initcall_t init_fn; | |
578 | ||
579 | np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np); | |
580 | ||
581 | if (!np) | |
582 | return -ENODEV; | |
583 | ||
584 | init_fn = (psci_initcall_t)matched_np->data; | |
585 | return init_fn(np); | |
586 | } | |
587 | ||
588 | #ifdef CONFIG_ACPI | |
589 | /* | |
590 | * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's | |
591 | * explicitly clarified in SBBR | |
592 | */ | |
593 | int __init psci_acpi_init(void) | |
594 | { | |
595 | if (!acpi_psci_present()) { | |
596 | pr_info("is not implemented in ACPI.\n"); | |
597 | return -EOPNOTSUPP; | |
598 | } | |
599 | ||
600 | pr_info("probing for conduit method from ACPI.\n"); | |
601 | ||
602 | if (acpi_psci_use_hvc()) | |
603 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
604 | else | |
605 | invoke_psci_fn = __invoke_psci_fn_smc; | |
606 | ||
607 | return psci_probe(); | |
608 | } | |
609 | #endif |