Commit | Line | Data |
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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 | ||
09a8d6d4 MZ |
62 | struct psci_operations psci_ops = { |
63 | .conduit = PSCI_CONDUIT_NONE, | |
e78eef55 | 64 | .smccc_version = SMCCC_VERSION_1_0, |
09a8d6d4 | 65 | }; |
bff60792 MR |
66 | |
67 | typedef unsigned long (psci_fn)(unsigned long, unsigned long, | |
68 | unsigned long, unsigned long); | |
bff60792 MR |
69 | static psci_fn *invoke_psci_fn; |
70 | ||
71 | enum psci_function { | |
72 | PSCI_FN_CPU_SUSPEND, | |
73 | PSCI_FN_CPU_ON, | |
74 | PSCI_FN_CPU_OFF, | |
75 | PSCI_FN_MIGRATE, | |
76 | PSCI_FN_MAX, | |
77 | }; | |
78 | ||
79 | static u32 psci_function_id[PSCI_FN_MAX]; | |
80 | ||
068654c2 LP |
81 | #define PSCI_0_2_POWER_STATE_MASK \ |
82 | (PSCI_0_2_POWER_STATE_ID_MASK | \ | |
83 | PSCI_0_2_POWER_STATE_TYPE_MASK | \ | |
84 | PSCI_0_2_POWER_STATE_AFFL_MASK) | |
85 | ||
a5c00bb2 LP |
86 | #define PSCI_1_0_EXT_POWER_STATE_MASK \ |
87 | (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \ | |
88 | PSCI_1_0_EXT_POWER_STATE_TYPE_MASK) | |
89 | ||
90 | static u32 psci_cpu_suspend_feature; | |
91 | ||
92 | static inline bool psci_has_ext_power_state(void) | |
93 | { | |
94 | return psci_cpu_suspend_feature & | |
95 | PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK; | |
96 | } | |
97 | ||
2b9cf189 | 98 | static inline bool psci_power_state_loses_context(u32 state) |
068654c2 | 99 | { |
a5c00bb2 LP |
100 | const u32 mask = psci_has_ext_power_state() ? |
101 | PSCI_1_0_EXT_POWER_STATE_TYPE_MASK : | |
102 | PSCI_0_2_POWER_STATE_TYPE_MASK; | |
103 | ||
104 | return state & mask; | |
068654c2 LP |
105 | } |
106 | ||
2b9cf189 | 107 | static inline bool psci_power_state_is_valid(u32 state) |
068654c2 | 108 | { |
a5c00bb2 LP |
109 | const u32 valid_mask = psci_has_ext_power_state() ? |
110 | PSCI_1_0_EXT_POWER_STATE_MASK : | |
111 | PSCI_0_2_POWER_STATE_MASK; | |
112 | ||
113 | return !(state & ~valid_mask); | |
068654c2 LP |
114 | } |
115 | ||
e679660d JW |
116 | static unsigned long __invoke_psci_fn_hvc(unsigned long function_id, |
117 | unsigned long arg0, unsigned long arg1, | |
118 | unsigned long arg2) | |
119 | { | |
120 | struct arm_smccc_res res; | |
121 | ||
122 | arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
123 | return res.a0; | |
124 | } | |
125 | ||
126 | static unsigned long __invoke_psci_fn_smc(unsigned long function_id, | |
127 | unsigned long arg0, unsigned long arg1, | |
128 | unsigned long arg2) | |
129 | { | |
130 | struct arm_smccc_res res; | |
131 | ||
132 | arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
133 | return res.a0; | |
134 | } | |
135 | ||
bff60792 MR |
136 | static int psci_to_linux_errno(int errno) |
137 | { | |
138 | switch (errno) { | |
139 | case PSCI_RET_SUCCESS: | |
140 | return 0; | |
141 | case PSCI_RET_NOT_SUPPORTED: | |
142 | return -EOPNOTSUPP; | |
143 | case PSCI_RET_INVALID_PARAMS: | |
2217d7c6 | 144 | case PSCI_RET_INVALID_ADDRESS: |
bff60792 MR |
145 | return -EINVAL; |
146 | case PSCI_RET_DENIED: | |
147 | return -EPERM; | |
148 | }; | |
149 | ||
150 | return -EINVAL; | |
151 | } | |
152 | ||
153 | static u32 psci_get_version(void) | |
154 | { | |
155 | return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); | |
156 | } | |
157 | ||
158 | static int psci_cpu_suspend(u32 state, unsigned long entry_point) | |
159 | { | |
160 | int err; | |
161 | u32 fn; | |
162 | ||
163 | fn = psci_function_id[PSCI_FN_CPU_SUSPEND]; | |
164 | err = invoke_psci_fn(fn, state, entry_point, 0); | |
165 | return psci_to_linux_errno(err); | |
166 | } | |
167 | ||
168 | static int psci_cpu_off(u32 state) | |
169 | { | |
170 | int err; | |
171 | u32 fn; | |
172 | ||
173 | fn = psci_function_id[PSCI_FN_CPU_OFF]; | |
174 | err = invoke_psci_fn(fn, state, 0, 0); | |
175 | return psci_to_linux_errno(err); | |
176 | } | |
177 | ||
178 | static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point) | |
179 | { | |
180 | int err; | |
181 | u32 fn; | |
182 | ||
183 | fn = psci_function_id[PSCI_FN_CPU_ON]; | |
184 | err = invoke_psci_fn(fn, cpuid, entry_point, 0); | |
185 | return psci_to_linux_errno(err); | |
186 | } | |
187 | ||
188 | static int psci_migrate(unsigned long cpuid) | |
189 | { | |
190 | int err; | |
191 | u32 fn; | |
192 | ||
193 | fn = psci_function_id[PSCI_FN_MIGRATE]; | |
194 | err = invoke_psci_fn(fn, cpuid, 0, 0); | |
195 | return psci_to_linux_errno(err); | |
196 | } | |
197 | ||
198 | static int psci_affinity_info(unsigned long target_affinity, | |
199 | unsigned long lowest_affinity_level) | |
200 | { | |
029180b1 | 201 | return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO), |
5211df00 | 202 | target_affinity, lowest_affinity_level, 0); |
bff60792 MR |
203 | } |
204 | ||
205 | static int psci_migrate_info_type(void) | |
206 | { | |
207 | return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0); | |
208 | } | |
209 | ||
210 | static unsigned long psci_migrate_info_up_cpu(void) | |
211 | { | |
029180b1 | 212 | return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU), |
5211df00 | 213 | 0, 0, 0); |
bff60792 MR |
214 | } |
215 | ||
09a8d6d4 MZ |
216 | static void set_conduit(enum psci_conduit conduit) |
217 | { | |
218 | switch (conduit) { | |
219 | case PSCI_CONDUIT_HVC: | |
220 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
221 | break; | |
222 | case PSCI_CONDUIT_SMC: | |
223 | invoke_psci_fn = __invoke_psci_fn_smc; | |
224 | break; | |
225 | default: | |
226 | WARN(1, "Unexpected PSCI conduit %d\n", conduit); | |
227 | } | |
228 | ||
229 | psci_ops.conduit = conduit; | |
230 | } | |
231 | ||
bff60792 MR |
232 | static int get_set_conduit_method(struct device_node *np) |
233 | { | |
234 | const char *method; | |
235 | ||
236 | pr_info("probing for conduit method from DT.\n"); | |
237 | ||
238 | if (of_property_read_string(np, "method", &method)) { | |
239 | pr_warn("missing \"method\" property\n"); | |
240 | return -ENXIO; | |
241 | } | |
242 | ||
243 | if (!strcmp("hvc", method)) { | |
09a8d6d4 | 244 | set_conduit(PSCI_CONDUIT_HVC); |
bff60792 | 245 | } else if (!strcmp("smc", method)) { |
09a8d6d4 | 246 | set_conduit(PSCI_CONDUIT_SMC); |
bff60792 MR |
247 | } else { |
248 | pr_warn("invalid \"method\" property: %s\n", method); | |
249 | return -EINVAL; | |
250 | } | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) | |
255 | { | |
256 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); | |
257 | } | |
258 | ||
259 | static void psci_sys_poweroff(void) | |
260 | { | |
261 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); | |
262 | } | |
263 | ||
5f004e0c LP |
264 | static int __init psci_features(u32 psci_func_id) |
265 | { | |
266 | return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, | |
267 | psci_func_id, 0, 0); | |
268 | } | |
269 | ||
8b6f2499 LP |
270 | #ifdef CONFIG_CPU_IDLE |
271 | static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state); | |
272 | ||
273 | static int psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu) | |
274 | { | |
275 | int i, ret, count = 0; | |
276 | u32 *psci_states; | |
277 | struct device_node *state_node; | |
278 | ||
8b6f2499 LP |
279 | /* Count idle states */ |
280 | while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states", | |
281 | count))) { | |
282 | count++; | |
283 | of_node_put(state_node); | |
284 | } | |
285 | ||
286 | if (!count) | |
287 | return -ENODEV; | |
288 | ||
289 | psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL); | |
290 | if (!psci_states) | |
291 | return -ENOMEM; | |
292 | ||
293 | for (i = 0; i < count; i++) { | |
294 | u32 state; | |
295 | ||
296 | state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i); | |
297 | ||
298 | ret = of_property_read_u32(state_node, | |
299 | "arm,psci-suspend-param", | |
300 | &state); | |
301 | if (ret) { | |
9deee319 RH |
302 | pr_warn(" * %pOF missing arm,psci-suspend-param property\n", |
303 | state_node); | |
8b6f2499 LP |
304 | of_node_put(state_node); |
305 | goto free_mem; | |
306 | } | |
307 | ||
308 | of_node_put(state_node); | |
309 | pr_debug("psci-power-state %#x index %d\n", state, i); | |
310 | if (!psci_power_state_is_valid(state)) { | |
311 | pr_warn("Invalid PSCI power state %#x\n", state); | |
312 | ret = -EINVAL; | |
313 | goto free_mem; | |
314 | } | |
315 | psci_states[i] = state; | |
316 | } | |
317 | /* Idle states parsed correctly, initialize per-cpu pointer */ | |
318 | per_cpu(psci_power_state, cpu) = psci_states; | |
319 | return 0; | |
320 | ||
321 | free_mem: | |
322 | kfree(psci_states); | |
323 | return ret; | |
324 | } | |
325 | ||
c2a25c14 SH |
326 | #ifdef CONFIG_ACPI |
327 | #include <acpi/processor.h> | |
328 | ||
329 | static int __maybe_unused psci_acpi_cpu_init_idle(unsigned int cpu) | |
330 | { | |
331 | int i, count; | |
332 | u32 *psci_states; | |
333 | struct acpi_lpi_state *lpi; | |
334 | struct acpi_processor *pr = per_cpu(processors, cpu); | |
335 | ||
336 | if (unlikely(!pr || !pr->flags.has_lpi)) | |
337 | return -EINVAL; | |
338 | ||
339 | count = pr->power.count - 1; | |
340 | if (count <= 0) | |
341 | return -ENODEV; | |
342 | ||
343 | psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL); | |
344 | if (!psci_states) | |
345 | return -ENOMEM; | |
346 | ||
347 | for (i = 0; i < count; i++) { | |
348 | u32 state; | |
349 | ||
350 | lpi = &pr->power.lpi_states[i + 1]; | |
351 | /* | |
352 | * Only bits[31:0] represent a PSCI power_state while | |
353 | * bits[63:32] must be 0x0 as per ARM ACPI FFH Specification | |
354 | */ | |
355 | state = lpi->address; | |
356 | if (!psci_power_state_is_valid(state)) { | |
357 | pr_warn("Invalid PSCI power state %#x\n", state); | |
358 | kfree(psci_states); | |
359 | return -EINVAL; | |
360 | } | |
361 | psci_states[i] = state; | |
362 | } | |
363 | /* Idle states parsed correctly, initialize per-cpu pointer */ | |
364 | per_cpu(psci_power_state, cpu) = psci_states; | |
365 | return 0; | |
366 | } | |
367 | #else | |
368 | static int __maybe_unused psci_acpi_cpu_init_idle(unsigned int cpu) | |
369 | { | |
370 | return -EINVAL; | |
371 | } | |
372 | #endif | |
373 | ||
8b6f2499 LP |
374 | int psci_cpu_init_idle(unsigned int cpu) |
375 | { | |
376 | struct device_node *cpu_node; | |
377 | int ret; | |
378 | ||
c2a25c14 SH |
379 | /* |
380 | * If the PSCI cpu_suspend function hook has not been initialized | |
381 | * idle states must not be enabled, so bail out | |
382 | */ | |
383 | if (!psci_ops.cpu_suspend) | |
384 | return -EOPNOTSUPP; | |
385 | ||
386 | if (!acpi_disabled) | |
387 | return psci_acpi_cpu_init_idle(cpu); | |
388 | ||
8b6f2499 LP |
389 | cpu_node = of_get_cpu_node(cpu, NULL); |
390 | if (!cpu_node) | |
391 | return -ENODEV; | |
392 | ||
393 | ret = psci_dt_cpu_init_idle(cpu_node, cpu); | |
394 | ||
395 | of_node_put(cpu_node); | |
396 | ||
397 | return ret; | |
398 | } | |
399 | ||
400 | static int psci_suspend_finisher(unsigned long index) | |
401 | { | |
402 | u32 *state = __this_cpu_read(psci_power_state); | |
403 | ||
404 | return psci_ops.cpu_suspend(state[index - 1], | |
1a08e3d9 | 405 | __pa_symbol(cpu_resume)); |
8b6f2499 LP |
406 | } |
407 | ||
408 | int psci_cpu_suspend_enter(unsigned long index) | |
409 | { | |
410 | int ret; | |
411 | u32 *state = __this_cpu_read(psci_power_state); | |
412 | /* | |
413 | * idle state index 0 corresponds to wfi, should never be called | |
414 | * from the cpu_suspend operations | |
415 | */ | |
416 | if (WARN_ON_ONCE(!index)) | |
417 | return -EINVAL; | |
418 | ||
419 | if (!psci_power_state_loses_context(state[index - 1])) | |
420 | ret = psci_ops.cpu_suspend(state[index - 1], 0); | |
421 | else | |
422 | ret = cpu_suspend(index, psci_suspend_finisher); | |
423 | ||
424 | return ret; | |
425 | } | |
426 | ||
427 | /* ARM specific CPU idle operations */ | |
428 | #ifdef CONFIG_ARM | |
5e7c17df | 429 | static const struct cpuidle_ops psci_cpuidle_ops __initconst = { |
8b6f2499 LP |
430 | .suspend = psci_cpu_suspend_enter, |
431 | .init = psci_dt_cpu_init_idle, | |
432 | }; | |
433 | ||
978fa436 | 434 | CPUIDLE_METHOD_OF_DECLARE(psci, "psci", &psci_cpuidle_ops); |
8b6f2499 LP |
435 | #endif |
436 | #endif | |
437 | ||
faf7ec4a SH |
438 | static int psci_system_suspend(unsigned long unused) |
439 | { | |
440 | return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND), | |
1c33dc10 | 441 | __pa_symbol(cpu_resume), 0, 0); |
faf7ec4a SH |
442 | } |
443 | ||
444 | static int psci_system_suspend_enter(suspend_state_t state) | |
445 | { | |
446 | return cpu_suspend(0, psci_system_suspend); | |
447 | } | |
448 | ||
449 | static const struct platform_suspend_ops psci_suspend_ops = { | |
450 | .valid = suspend_valid_only_mem, | |
451 | .enter = psci_system_suspend_enter, | |
452 | }; | |
453 | ||
454 | static void __init psci_init_system_suspend(void) | |
455 | { | |
456 | int ret; | |
457 | ||
458 | if (!IS_ENABLED(CONFIG_SUSPEND)) | |
459 | return; | |
460 | ||
461 | ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND)); | |
462 | ||
463 | if (ret != PSCI_RET_NOT_SUPPORTED) | |
464 | suspend_set_ops(&psci_suspend_ops); | |
465 | } | |
466 | ||
a5c00bb2 LP |
467 | static void __init psci_init_cpu_suspend(void) |
468 | { | |
469 | int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]); | |
470 | ||
471 | if (feature != PSCI_RET_NOT_SUPPORTED) | |
472 | psci_cpu_suspend_feature = feature; | |
473 | } | |
474 | ||
bff60792 MR |
475 | /* |
476 | * Detect the presence of a resident Trusted OS which may cause CPU_OFF to | |
477 | * return DENIED (which would be fatal). | |
478 | */ | |
479 | static void __init psci_init_migrate(void) | |
480 | { | |
481 | unsigned long cpuid; | |
482 | int type, cpu = -1; | |
483 | ||
484 | type = psci_ops.migrate_info_type(); | |
485 | ||
486 | if (type == PSCI_0_2_TOS_MP) { | |
487 | pr_info("Trusted OS migration not required\n"); | |
488 | return; | |
489 | } | |
490 | ||
491 | if (type == PSCI_RET_NOT_SUPPORTED) { | |
492 | pr_info("MIGRATE_INFO_TYPE not supported.\n"); | |
493 | return; | |
494 | } | |
495 | ||
496 | if (type != PSCI_0_2_TOS_UP_MIGRATE && | |
497 | type != PSCI_0_2_TOS_UP_NO_MIGRATE) { | |
498 | pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type); | |
499 | return; | |
500 | } | |
501 | ||
502 | cpuid = psci_migrate_info_up_cpu(); | |
503 | if (cpuid & ~MPIDR_HWID_BITMASK) { | |
504 | pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n", | |
505 | cpuid); | |
506 | return; | |
507 | } | |
508 | ||
509 | cpu = get_logical_index(cpuid); | |
510 | resident_cpu = cpu >= 0 ? cpu : -1; | |
511 | ||
512 | pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid); | |
513 | } | |
514 | ||
e78eef55 MZ |
515 | static void __init psci_init_smccc(void) |
516 | { | |
517 | u32 ver = ARM_SMCCC_VERSION_1_0; | |
518 | int feature; | |
519 | ||
520 | feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID); | |
521 | ||
522 | if (feature != PSCI_RET_NOT_SUPPORTED) { | |
523 | u32 ret; | |
524 | ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0); | |
525 | if (ret == ARM_SMCCC_VERSION_1_1) { | |
526 | psci_ops.smccc_version = SMCCC_VERSION_1_1; | |
527 | ver = ret; | |
528 | } | |
529 | } | |
530 | ||
531 | /* | |
532 | * Conveniently, the SMCCC and PSCI versions are encoded the | |
533 | * same way. No, this isn't accidental. | |
534 | */ | |
535 | pr_info("SMC Calling Convention v%d.%d\n", | |
536 | PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver)); | |
537 | ||
538 | } | |
539 | ||
bff60792 MR |
540 | static void __init psci_0_2_set_functions(void) |
541 | { | |
542 | pr_info("Using standard PSCI v0.2 function IDs\n"); | |
d68e3ba5 WD |
543 | psci_ops.get_version = psci_get_version; |
544 | ||
029180b1 SH |
545 | psci_function_id[PSCI_FN_CPU_SUSPEND] = |
546 | PSCI_FN_NATIVE(0_2, CPU_SUSPEND); | |
bff60792 MR |
547 | psci_ops.cpu_suspend = psci_cpu_suspend; |
548 | ||
549 | psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF; | |
550 | psci_ops.cpu_off = psci_cpu_off; | |
551 | ||
029180b1 | 552 | psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON); |
bff60792 MR |
553 | psci_ops.cpu_on = psci_cpu_on; |
554 | ||
029180b1 | 555 | psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE); |
bff60792 MR |
556 | psci_ops.migrate = psci_migrate; |
557 | ||
558 | psci_ops.affinity_info = psci_affinity_info; | |
559 | ||
560 | psci_ops.migrate_info_type = psci_migrate_info_type; | |
561 | ||
562 | arm_pm_restart = psci_sys_reset; | |
563 | ||
564 | pm_power_off = psci_sys_poweroff; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Probe function for PSCI firmware versions >= 0.2 | |
569 | */ | |
570 | static int __init psci_probe(void) | |
571 | { | |
572 | u32 ver = psci_get_version(); | |
573 | ||
574 | pr_info("PSCIv%d.%d detected in firmware.\n", | |
575 | PSCI_VERSION_MAJOR(ver), | |
576 | PSCI_VERSION_MINOR(ver)); | |
577 | ||
578 | if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) { | |
579 | pr_err("Conflicting PSCI version detected.\n"); | |
580 | return -EINVAL; | |
581 | } | |
582 | ||
583 | psci_0_2_set_functions(); | |
584 | ||
585 | psci_init_migrate(); | |
586 | ||
79b04beb | 587 | if (PSCI_VERSION_MAJOR(ver) >= 1) { |
e78eef55 | 588 | psci_init_smccc(); |
79b04beb LP |
589 | psci_init_cpu_suspend(); |
590 | psci_init_system_suspend(); | |
591 | } | |
faf7ec4a | 592 | |
bff60792 MR |
593 | return 0; |
594 | } | |
595 | ||
596 | typedef int (*psci_initcall_t)(const struct device_node *); | |
597 | ||
598 | /* | |
599 | * PSCI init function for PSCI versions >=0.2 | |
600 | * | |
601 | * Probe based on PSCI PSCI_VERSION function | |
602 | */ | |
603 | static int __init psci_0_2_init(struct device_node *np) | |
604 | { | |
605 | int err; | |
606 | ||
607 | err = get_set_conduit_method(np); | |
608 | ||
609 | if (err) | |
610 | goto out_put_node; | |
611 | /* | |
612 | * Starting with v0.2, the PSCI specification introduced a call | |
613 | * (PSCI_VERSION) that allows probing the firmware version, so | |
614 | * that PSCI function IDs and version specific initialization | |
615 | * can be carried out according to the specific version reported | |
616 | * by firmware | |
617 | */ | |
618 | err = psci_probe(); | |
619 | ||
620 | out_put_node: | |
621 | of_node_put(np); | |
622 | return err; | |
623 | } | |
624 | ||
625 | /* | |
626 | * PSCI < v0.2 get PSCI Function IDs via DT. | |
627 | */ | |
628 | static int __init psci_0_1_init(struct device_node *np) | |
629 | { | |
630 | u32 id; | |
631 | int err; | |
632 | ||
633 | err = get_set_conduit_method(np); | |
634 | ||
635 | if (err) | |
636 | goto out_put_node; | |
637 | ||
638 | pr_info("Using PSCI v0.1 Function IDs from DT\n"); | |
639 | ||
640 | if (!of_property_read_u32(np, "cpu_suspend", &id)) { | |
641 | psci_function_id[PSCI_FN_CPU_SUSPEND] = id; | |
642 | psci_ops.cpu_suspend = psci_cpu_suspend; | |
643 | } | |
644 | ||
645 | if (!of_property_read_u32(np, "cpu_off", &id)) { | |
646 | psci_function_id[PSCI_FN_CPU_OFF] = id; | |
647 | psci_ops.cpu_off = psci_cpu_off; | |
648 | } | |
649 | ||
650 | if (!of_property_read_u32(np, "cpu_on", &id)) { | |
651 | psci_function_id[PSCI_FN_CPU_ON] = id; | |
652 | psci_ops.cpu_on = psci_cpu_on; | |
653 | } | |
654 | ||
655 | if (!of_property_read_u32(np, "migrate", &id)) { | |
656 | psci_function_id[PSCI_FN_MIGRATE] = id; | |
657 | psci_ops.migrate = psci_migrate; | |
658 | } | |
659 | ||
660 | out_put_node: | |
661 | of_node_put(np); | |
662 | return err; | |
663 | } | |
664 | ||
1d2d8de4 | 665 | static const struct of_device_id psci_of_match[] __initconst = { |
bff60792 MR |
666 | { .compatible = "arm,psci", .data = psci_0_1_init}, |
667 | { .compatible = "arm,psci-0.2", .data = psci_0_2_init}, | |
0fc197c7 | 668 | { .compatible = "arm,psci-1.0", .data = psci_0_2_init}, |
bff60792 MR |
669 | {}, |
670 | }; | |
671 | ||
672 | int __init psci_dt_init(void) | |
673 | { | |
674 | struct device_node *np; | |
675 | const struct of_device_id *matched_np; | |
676 | psci_initcall_t init_fn; | |
677 | ||
678 | np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np); | |
679 | ||
d09a0011 | 680 | if (!np || !of_device_is_available(np)) |
bff60792 MR |
681 | return -ENODEV; |
682 | ||
683 | init_fn = (psci_initcall_t)matched_np->data; | |
684 | return init_fn(np); | |
685 | } | |
686 | ||
687 | #ifdef CONFIG_ACPI | |
688 | /* | |
689 | * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's | |
690 | * explicitly clarified in SBBR | |
691 | */ | |
692 | int __init psci_acpi_init(void) | |
693 | { | |
694 | if (!acpi_psci_present()) { | |
695 | pr_info("is not implemented in ACPI.\n"); | |
696 | return -EOPNOTSUPP; | |
697 | } | |
698 | ||
699 | pr_info("probing for conduit method from ACPI.\n"); | |
700 | ||
701 | if (acpi_psci_use_hvc()) | |
09a8d6d4 | 702 | set_conduit(PSCI_CONDUIT_HVC); |
bff60792 | 703 | else |
09a8d6d4 | 704 | set_conduit(PSCI_CONDUIT_SMC); |
bff60792 MR |
705 | |
706 | return psci_probe(); | |
707 | } | |
708 | #endif |