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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 | ||
c2a25c14 | 16 | #include <linux/acpi.h> |
e679660d | 17 | #include <linux/arm-smccc.h> |
8b6f2499 | 18 | #include <linux/cpuidle.h> |
bff60792 MR |
19 | #include <linux/errno.h> |
20 | #include <linux/linkage.h> | |
21 | #include <linux/of.h> | |
22 | #include <linux/pm.h> | |
23 | #include <linux/printk.h> | |
24 | #include <linux/psci.h> | |
25 | #include <linux/reboot.h> | |
8b6f2499 | 26 | #include <linux/slab.h> |
faf7ec4a | 27 | #include <linux/suspend.h> |
bff60792 MR |
28 | |
29 | #include <uapi/linux/psci.h> | |
30 | ||
8b6f2499 | 31 | #include <asm/cpuidle.h> |
bff60792 MR |
32 | #include <asm/cputype.h> |
33 | #include <asm/system_misc.h> | |
34 | #include <asm/smp_plat.h> | |
faf7ec4a | 35 | #include <asm/suspend.h> |
bff60792 | 36 | |
5211df00 MR |
37 | /* |
38 | * While a 64-bit OS can make calls with SMC32 calling conventions, for some | |
029180b1 SH |
39 | * calls it is necessary to use SMC64 to pass or return 64-bit values. |
40 | * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate | |
41 | * (native-width) function ID. | |
5211df00 MR |
42 | */ |
43 | #ifdef CONFIG_64BIT | |
029180b1 | 44 | #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name |
5211df00 | 45 | #else |
029180b1 | 46 | #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name |
5211df00 MR |
47 | #endif |
48 | ||
bff60792 MR |
49 | /* |
50 | * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF | |
51 | * calls to its resident CPU, so we must avoid issuing those. We never migrate | |
52 | * a Trusted OS even if it claims to be capable of migration -- doing so will | |
53 | * require cooperation with a Trusted OS driver. | |
54 | */ | |
55 | static int resident_cpu = -1; | |
56 | ||
57 | bool psci_tos_resident_on(int cpu) | |
58 | { | |
59 | return cpu == resident_cpu; | |
60 | } | |
61 | ||
62 | struct psci_operations psci_ops; | |
63 | ||
64 | typedef unsigned long (psci_fn)(unsigned long, unsigned long, | |
65 | unsigned long, unsigned long); | |
bff60792 MR |
66 | static psci_fn *invoke_psci_fn; |
67 | ||
68 | enum psci_function { | |
69 | PSCI_FN_CPU_SUSPEND, | |
70 | PSCI_FN_CPU_ON, | |
71 | PSCI_FN_CPU_OFF, | |
72 | PSCI_FN_MIGRATE, | |
73 | PSCI_FN_MAX, | |
74 | }; | |
75 | ||
76 | static u32 psci_function_id[PSCI_FN_MAX]; | |
77 | ||
068654c2 LP |
78 | #define PSCI_0_2_POWER_STATE_MASK \ |
79 | (PSCI_0_2_POWER_STATE_ID_MASK | \ | |
80 | PSCI_0_2_POWER_STATE_TYPE_MASK | \ | |
81 | PSCI_0_2_POWER_STATE_AFFL_MASK) | |
82 | ||
a5c00bb2 LP |
83 | #define PSCI_1_0_EXT_POWER_STATE_MASK \ |
84 | (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \ | |
85 | PSCI_1_0_EXT_POWER_STATE_TYPE_MASK) | |
86 | ||
87 | static u32 psci_cpu_suspend_feature; | |
88 | ||
89 | static inline bool psci_has_ext_power_state(void) | |
90 | { | |
91 | return psci_cpu_suspend_feature & | |
92 | PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK; | |
93 | } | |
94 | ||
2b9cf189 | 95 | static inline bool psci_power_state_loses_context(u32 state) |
068654c2 | 96 | { |
a5c00bb2 LP |
97 | const u32 mask = psci_has_ext_power_state() ? |
98 | PSCI_1_0_EXT_POWER_STATE_TYPE_MASK : | |
99 | PSCI_0_2_POWER_STATE_TYPE_MASK; | |
100 | ||
101 | return state & mask; | |
068654c2 LP |
102 | } |
103 | ||
2b9cf189 | 104 | static inline bool psci_power_state_is_valid(u32 state) |
068654c2 | 105 | { |
a5c00bb2 LP |
106 | const u32 valid_mask = psci_has_ext_power_state() ? |
107 | PSCI_1_0_EXT_POWER_STATE_MASK : | |
108 | PSCI_0_2_POWER_STATE_MASK; | |
109 | ||
110 | return !(state & ~valid_mask); | |
068654c2 LP |
111 | } |
112 | ||
e679660d JW |
113 | static unsigned long __invoke_psci_fn_hvc(unsigned long function_id, |
114 | unsigned long arg0, unsigned long arg1, | |
115 | unsigned long arg2) | |
116 | { | |
117 | struct arm_smccc_res res; | |
118 | ||
119 | arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
120 | return res.a0; | |
121 | } | |
122 | ||
123 | static unsigned long __invoke_psci_fn_smc(unsigned long function_id, | |
124 | unsigned long arg0, unsigned long arg1, | |
125 | unsigned long arg2) | |
126 | { | |
127 | struct arm_smccc_res res; | |
128 | ||
129 | arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
130 | return res.a0; | |
131 | } | |
132 | ||
bff60792 MR |
133 | static int psci_to_linux_errno(int errno) |
134 | { | |
135 | switch (errno) { | |
136 | case PSCI_RET_SUCCESS: | |
137 | return 0; | |
138 | case PSCI_RET_NOT_SUPPORTED: | |
139 | return -EOPNOTSUPP; | |
140 | case PSCI_RET_INVALID_PARAMS: | |
2217d7c6 | 141 | case PSCI_RET_INVALID_ADDRESS: |
bff60792 MR |
142 | return -EINVAL; |
143 | case PSCI_RET_DENIED: | |
144 | return -EPERM; | |
145 | }; | |
146 | ||
147 | return -EINVAL; | |
148 | } | |
149 | ||
150 | static u32 psci_get_version(void) | |
151 | { | |
152 | return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); | |
153 | } | |
154 | ||
155 | static int psci_cpu_suspend(u32 state, unsigned long entry_point) | |
156 | { | |
157 | int err; | |
158 | u32 fn; | |
159 | ||
160 | fn = psci_function_id[PSCI_FN_CPU_SUSPEND]; | |
161 | err = invoke_psci_fn(fn, state, entry_point, 0); | |
162 | return psci_to_linux_errno(err); | |
163 | } | |
164 | ||
165 | static int psci_cpu_off(u32 state) | |
166 | { | |
167 | int err; | |
168 | u32 fn; | |
169 | ||
170 | fn = psci_function_id[PSCI_FN_CPU_OFF]; | |
171 | err = invoke_psci_fn(fn, state, 0, 0); | |
172 | return psci_to_linux_errno(err); | |
173 | } | |
174 | ||
175 | static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point) | |
176 | { | |
177 | int err; | |
178 | u32 fn; | |
179 | ||
180 | fn = psci_function_id[PSCI_FN_CPU_ON]; | |
181 | err = invoke_psci_fn(fn, cpuid, entry_point, 0); | |
182 | return psci_to_linux_errno(err); | |
183 | } | |
184 | ||
185 | static int psci_migrate(unsigned long cpuid) | |
186 | { | |
187 | int err; | |
188 | u32 fn; | |
189 | ||
190 | fn = psci_function_id[PSCI_FN_MIGRATE]; | |
191 | err = invoke_psci_fn(fn, cpuid, 0, 0); | |
192 | return psci_to_linux_errno(err); | |
193 | } | |
194 | ||
195 | static int psci_affinity_info(unsigned long target_affinity, | |
196 | unsigned long lowest_affinity_level) | |
197 | { | |
029180b1 | 198 | return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO), |
5211df00 | 199 | target_affinity, lowest_affinity_level, 0); |
bff60792 MR |
200 | } |
201 | ||
202 | static int psci_migrate_info_type(void) | |
203 | { | |
204 | return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0); | |
205 | } | |
206 | ||
207 | static unsigned long psci_migrate_info_up_cpu(void) | |
208 | { | |
029180b1 | 209 | return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU), |
5211df00 | 210 | 0, 0, 0); |
bff60792 MR |
211 | } |
212 | ||
213 | static int get_set_conduit_method(struct device_node *np) | |
214 | { | |
215 | const char *method; | |
216 | ||
217 | pr_info("probing for conduit method from DT.\n"); | |
218 | ||
219 | if (of_property_read_string(np, "method", &method)) { | |
220 | pr_warn("missing \"method\" property\n"); | |
221 | return -ENXIO; | |
222 | } | |
223 | ||
224 | if (!strcmp("hvc", method)) { | |
225 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
226 | } else if (!strcmp("smc", method)) { | |
227 | invoke_psci_fn = __invoke_psci_fn_smc; | |
228 | } else { | |
229 | pr_warn("invalid \"method\" property: %s\n", method); | |
230 | return -EINVAL; | |
231 | } | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) | |
236 | { | |
237 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); | |
238 | } | |
239 | ||
240 | static void psci_sys_poweroff(void) | |
241 | { | |
242 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); | |
243 | } | |
244 | ||
5f004e0c LP |
245 | static int __init psci_features(u32 psci_func_id) |
246 | { | |
247 | return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, | |
248 | psci_func_id, 0, 0); | |
249 | } | |
250 | ||
8b6f2499 LP |
251 | #ifdef CONFIG_CPU_IDLE |
252 | static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state); | |
253 | ||
254 | static int psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu) | |
255 | { | |
256 | int i, ret, count = 0; | |
257 | u32 *psci_states; | |
258 | struct device_node *state_node; | |
259 | ||
8b6f2499 LP |
260 | /* Count idle states */ |
261 | while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states", | |
262 | count))) { | |
263 | count++; | |
264 | of_node_put(state_node); | |
265 | } | |
266 | ||
267 | if (!count) | |
268 | return -ENODEV; | |
269 | ||
270 | psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL); | |
271 | if (!psci_states) | |
272 | return -ENOMEM; | |
273 | ||
274 | for (i = 0; i < count; i++) { | |
275 | u32 state; | |
276 | ||
277 | state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i); | |
278 | ||
279 | ret = of_property_read_u32(state_node, | |
280 | "arm,psci-suspend-param", | |
281 | &state); | |
282 | if (ret) { | |
283 | pr_warn(" * %s missing arm,psci-suspend-param property\n", | |
284 | state_node->full_name); | |
285 | of_node_put(state_node); | |
286 | goto free_mem; | |
287 | } | |
288 | ||
289 | of_node_put(state_node); | |
290 | pr_debug("psci-power-state %#x index %d\n", state, i); | |
291 | if (!psci_power_state_is_valid(state)) { | |
292 | pr_warn("Invalid PSCI power state %#x\n", state); | |
293 | ret = -EINVAL; | |
294 | goto free_mem; | |
295 | } | |
296 | psci_states[i] = state; | |
297 | } | |
298 | /* Idle states parsed correctly, initialize per-cpu pointer */ | |
299 | per_cpu(psci_power_state, cpu) = psci_states; | |
300 | return 0; | |
301 | ||
302 | free_mem: | |
303 | kfree(psci_states); | |
304 | return ret; | |
305 | } | |
306 | ||
c2a25c14 SH |
307 | #ifdef CONFIG_ACPI |
308 | #include <acpi/processor.h> | |
309 | ||
310 | static int __maybe_unused psci_acpi_cpu_init_idle(unsigned int cpu) | |
311 | { | |
312 | int i, count; | |
313 | u32 *psci_states; | |
314 | struct acpi_lpi_state *lpi; | |
315 | struct acpi_processor *pr = per_cpu(processors, cpu); | |
316 | ||
317 | if (unlikely(!pr || !pr->flags.has_lpi)) | |
318 | return -EINVAL; | |
319 | ||
320 | count = pr->power.count - 1; | |
321 | if (count <= 0) | |
322 | return -ENODEV; | |
323 | ||
324 | psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL); | |
325 | if (!psci_states) | |
326 | return -ENOMEM; | |
327 | ||
328 | for (i = 0; i < count; i++) { | |
329 | u32 state; | |
330 | ||
331 | lpi = &pr->power.lpi_states[i + 1]; | |
332 | /* | |
333 | * Only bits[31:0] represent a PSCI power_state while | |
334 | * bits[63:32] must be 0x0 as per ARM ACPI FFH Specification | |
335 | */ | |
336 | state = lpi->address; | |
337 | if (!psci_power_state_is_valid(state)) { | |
338 | pr_warn("Invalid PSCI power state %#x\n", state); | |
339 | kfree(psci_states); | |
340 | return -EINVAL; | |
341 | } | |
342 | psci_states[i] = state; | |
343 | } | |
344 | /* Idle states parsed correctly, initialize per-cpu pointer */ | |
345 | per_cpu(psci_power_state, cpu) = psci_states; | |
346 | return 0; | |
347 | } | |
348 | #else | |
349 | static int __maybe_unused psci_acpi_cpu_init_idle(unsigned int cpu) | |
350 | { | |
351 | return -EINVAL; | |
352 | } | |
353 | #endif | |
354 | ||
8b6f2499 LP |
355 | int psci_cpu_init_idle(unsigned int cpu) |
356 | { | |
357 | struct device_node *cpu_node; | |
358 | int ret; | |
359 | ||
c2a25c14 SH |
360 | /* |
361 | * If the PSCI cpu_suspend function hook has not been initialized | |
362 | * idle states must not be enabled, so bail out | |
363 | */ | |
364 | if (!psci_ops.cpu_suspend) | |
365 | return -EOPNOTSUPP; | |
366 | ||
367 | if (!acpi_disabled) | |
368 | return psci_acpi_cpu_init_idle(cpu); | |
369 | ||
8b6f2499 LP |
370 | cpu_node = of_get_cpu_node(cpu, NULL); |
371 | if (!cpu_node) | |
372 | return -ENODEV; | |
373 | ||
374 | ret = psci_dt_cpu_init_idle(cpu_node, cpu); | |
375 | ||
376 | of_node_put(cpu_node); | |
377 | ||
378 | return ret; | |
379 | } | |
380 | ||
381 | static int psci_suspend_finisher(unsigned long index) | |
382 | { | |
383 | u32 *state = __this_cpu_read(psci_power_state); | |
384 | ||
385 | return psci_ops.cpu_suspend(state[index - 1], | |
386 | virt_to_phys(cpu_resume)); | |
387 | } | |
388 | ||
389 | int psci_cpu_suspend_enter(unsigned long index) | |
390 | { | |
391 | int ret; | |
392 | u32 *state = __this_cpu_read(psci_power_state); | |
393 | /* | |
394 | * idle state index 0 corresponds to wfi, should never be called | |
395 | * from the cpu_suspend operations | |
396 | */ | |
397 | if (WARN_ON_ONCE(!index)) | |
398 | return -EINVAL; | |
399 | ||
400 | if (!psci_power_state_loses_context(state[index - 1])) | |
401 | ret = psci_ops.cpu_suspend(state[index - 1], 0); | |
402 | else | |
403 | ret = cpu_suspend(index, psci_suspend_finisher); | |
404 | ||
405 | return ret; | |
406 | } | |
407 | ||
408 | /* ARM specific CPU idle operations */ | |
409 | #ifdef CONFIG_ARM | |
5e7c17df | 410 | static const struct cpuidle_ops psci_cpuidle_ops __initconst = { |
8b6f2499 LP |
411 | .suspend = psci_cpu_suspend_enter, |
412 | .init = psci_dt_cpu_init_idle, | |
413 | }; | |
414 | ||
978fa436 | 415 | CPUIDLE_METHOD_OF_DECLARE(psci, "psci", &psci_cpuidle_ops); |
8b6f2499 LP |
416 | #endif |
417 | #endif | |
418 | ||
faf7ec4a SH |
419 | static int psci_system_suspend(unsigned long unused) |
420 | { | |
421 | return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND), | |
422 | virt_to_phys(cpu_resume), 0, 0); | |
423 | } | |
424 | ||
425 | static int psci_system_suspend_enter(suspend_state_t state) | |
426 | { | |
427 | return cpu_suspend(0, psci_system_suspend); | |
428 | } | |
429 | ||
430 | static const struct platform_suspend_ops psci_suspend_ops = { | |
431 | .valid = suspend_valid_only_mem, | |
432 | .enter = psci_system_suspend_enter, | |
433 | }; | |
434 | ||
435 | static void __init psci_init_system_suspend(void) | |
436 | { | |
437 | int ret; | |
438 | ||
439 | if (!IS_ENABLED(CONFIG_SUSPEND)) | |
440 | return; | |
441 | ||
442 | ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND)); | |
443 | ||
444 | if (ret != PSCI_RET_NOT_SUPPORTED) | |
445 | suspend_set_ops(&psci_suspend_ops); | |
446 | } | |
447 | ||
a5c00bb2 LP |
448 | static void __init psci_init_cpu_suspend(void) |
449 | { | |
450 | int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]); | |
451 | ||
452 | if (feature != PSCI_RET_NOT_SUPPORTED) | |
453 | psci_cpu_suspend_feature = feature; | |
454 | } | |
455 | ||
bff60792 MR |
456 | /* |
457 | * Detect the presence of a resident Trusted OS which may cause CPU_OFF to | |
458 | * return DENIED (which would be fatal). | |
459 | */ | |
460 | static void __init psci_init_migrate(void) | |
461 | { | |
462 | unsigned long cpuid; | |
463 | int type, cpu = -1; | |
464 | ||
465 | type = psci_ops.migrate_info_type(); | |
466 | ||
467 | if (type == PSCI_0_2_TOS_MP) { | |
468 | pr_info("Trusted OS migration not required\n"); | |
469 | return; | |
470 | } | |
471 | ||
472 | if (type == PSCI_RET_NOT_SUPPORTED) { | |
473 | pr_info("MIGRATE_INFO_TYPE not supported.\n"); | |
474 | return; | |
475 | } | |
476 | ||
477 | if (type != PSCI_0_2_TOS_UP_MIGRATE && | |
478 | type != PSCI_0_2_TOS_UP_NO_MIGRATE) { | |
479 | pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type); | |
480 | return; | |
481 | } | |
482 | ||
483 | cpuid = psci_migrate_info_up_cpu(); | |
484 | if (cpuid & ~MPIDR_HWID_BITMASK) { | |
485 | pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n", | |
486 | cpuid); | |
487 | return; | |
488 | } | |
489 | ||
490 | cpu = get_logical_index(cpuid); | |
491 | resident_cpu = cpu >= 0 ? cpu : -1; | |
492 | ||
493 | pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid); | |
494 | } | |
495 | ||
496 | static void __init psci_0_2_set_functions(void) | |
497 | { | |
498 | pr_info("Using standard PSCI v0.2 function IDs\n"); | |
029180b1 SH |
499 | psci_function_id[PSCI_FN_CPU_SUSPEND] = |
500 | PSCI_FN_NATIVE(0_2, CPU_SUSPEND); | |
bff60792 MR |
501 | psci_ops.cpu_suspend = psci_cpu_suspend; |
502 | ||
503 | psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF; | |
504 | psci_ops.cpu_off = psci_cpu_off; | |
505 | ||
029180b1 | 506 | psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON); |
bff60792 MR |
507 | psci_ops.cpu_on = psci_cpu_on; |
508 | ||
029180b1 | 509 | psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE); |
bff60792 MR |
510 | psci_ops.migrate = psci_migrate; |
511 | ||
512 | psci_ops.affinity_info = psci_affinity_info; | |
513 | ||
514 | psci_ops.migrate_info_type = psci_migrate_info_type; | |
515 | ||
516 | arm_pm_restart = psci_sys_reset; | |
517 | ||
518 | pm_power_off = psci_sys_poweroff; | |
519 | } | |
520 | ||
521 | /* | |
522 | * Probe function for PSCI firmware versions >= 0.2 | |
523 | */ | |
524 | static int __init psci_probe(void) | |
525 | { | |
526 | u32 ver = psci_get_version(); | |
527 | ||
528 | pr_info("PSCIv%d.%d detected in firmware.\n", | |
529 | PSCI_VERSION_MAJOR(ver), | |
530 | PSCI_VERSION_MINOR(ver)); | |
531 | ||
532 | if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) { | |
533 | pr_err("Conflicting PSCI version detected.\n"); | |
534 | return -EINVAL; | |
535 | } | |
536 | ||
537 | psci_0_2_set_functions(); | |
538 | ||
539 | psci_init_migrate(); | |
540 | ||
79b04beb LP |
541 | if (PSCI_VERSION_MAJOR(ver) >= 1) { |
542 | psci_init_cpu_suspend(); | |
543 | psci_init_system_suspend(); | |
544 | } | |
faf7ec4a | 545 | |
bff60792 MR |
546 | return 0; |
547 | } | |
548 | ||
549 | typedef int (*psci_initcall_t)(const struct device_node *); | |
550 | ||
551 | /* | |
552 | * PSCI init function for PSCI versions >=0.2 | |
553 | * | |
554 | * Probe based on PSCI PSCI_VERSION function | |
555 | */ | |
556 | static int __init psci_0_2_init(struct device_node *np) | |
557 | { | |
558 | int err; | |
559 | ||
560 | err = get_set_conduit_method(np); | |
561 | ||
562 | if (err) | |
563 | goto out_put_node; | |
564 | /* | |
565 | * Starting with v0.2, the PSCI specification introduced a call | |
566 | * (PSCI_VERSION) that allows probing the firmware version, so | |
567 | * that PSCI function IDs and version specific initialization | |
568 | * can be carried out according to the specific version reported | |
569 | * by firmware | |
570 | */ | |
571 | err = psci_probe(); | |
572 | ||
573 | out_put_node: | |
574 | of_node_put(np); | |
575 | return err; | |
576 | } | |
577 | ||
578 | /* | |
579 | * PSCI < v0.2 get PSCI Function IDs via DT. | |
580 | */ | |
581 | static int __init psci_0_1_init(struct device_node *np) | |
582 | { | |
583 | u32 id; | |
584 | int err; | |
585 | ||
586 | err = get_set_conduit_method(np); | |
587 | ||
588 | if (err) | |
589 | goto out_put_node; | |
590 | ||
591 | pr_info("Using PSCI v0.1 Function IDs from DT\n"); | |
592 | ||
593 | if (!of_property_read_u32(np, "cpu_suspend", &id)) { | |
594 | psci_function_id[PSCI_FN_CPU_SUSPEND] = id; | |
595 | psci_ops.cpu_suspend = psci_cpu_suspend; | |
596 | } | |
597 | ||
598 | if (!of_property_read_u32(np, "cpu_off", &id)) { | |
599 | psci_function_id[PSCI_FN_CPU_OFF] = id; | |
600 | psci_ops.cpu_off = psci_cpu_off; | |
601 | } | |
602 | ||
603 | if (!of_property_read_u32(np, "cpu_on", &id)) { | |
604 | psci_function_id[PSCI_FN_CPU_ON] = id; | |
605 | psci_ops.cpu_on = psci_cpu_on; | |
606 | } | |
607 | ||
608 | if (!of_property_read_u32(np, "migrate", &id)) { | |
609 | psci_function_id[PSCI_FN_MIGRATE] = id; | |
610 | psci_ops.migrate = psci_migrate; | |
611 | } | |
612 | ||
613 | out_put_node: | |
614 | of_node_put(np); | |
615 | return err; | |
616 | } | |
617 | ||
1d2d8de4 | 618 | static const struct of_device_id psci_of_match[] __initconst = { |
bff60792 MR |
619 | { .compatible = "arm,psci", .data = psci_0_1_init}, |
620 | { .compatible = "arm,psci-0.2", .data = psci_0_2_init}, | |
0fc197c7 | 621 | { .compatible = "arm,psci-1.0", .data = psci_0_2_init}, |
bff60792 MR |
622 | {}, |
623 | }; | |
624 | ||
625 | int __init psci_dt_init(void) | |
626 | { | |
627 | struct device_node *np; | |
628 | const struct of_device_id *matched_np; | |
629 | psci_initcall_t init_fn; | |
630 | ||
631 | np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np); | |
632 | ||
633 | if (!np) | |
634 | return -ENODEV; | |
635 | ||
636 | init_fn = (psci_initcall_t)matched_np->data; | |
637 | return init_fn(np); | |
638 | } | |
639 | ||
640 | #ifdef CONFIG_ACPI | |
641 | /* | |
642 | * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's | |
643 | * explicitly clarified in SBBR | |
644 | */ | |
645 | int __init psci_acpi_init(void) | |
646 | { | |
647 | if (!acpi_psci_present()) { | |
648 | pr_info("is not implemented in ACPI.\n"); | |
649 | return -EOPNOTSUPP; | |
650 | } | |
651 | ||
652 | pr_info("probing for conduit method from ACPI.\n"); | |
653 | ||
654 | if (acpi_psci_use_hvc()) | |
655 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
656 | else | |
657 | invoke_psci_fn = __invoke_psci_fn_smc; | |
658 | ||
659 | return psci_probe(); | |
660 | } | |
661 | #endif |