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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 | ||
16 | #include <linux/errno.h> | |
17 | #include <linux/linkage.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/pm.h> | |
20 | #include <linux/printk.h> | |
21 | #include <linux/psci.h> | |
22 | #include <linux/reboot.h> | |
faf7ec4a | 23 | #include <linux/suspend.h> |
bff60792 MR |
24 | |
25 | #include <uapi/linux/psci.h> | |
26 | ||
27 | #include <asm/cputype.h> | |
28 | #include <asm/system_misc.h> | |
29 | #include <asm/smp_plat.h> | |
faf7ec4a | 30 | #include <asm/suspend.h> |
bff60792 | 31 | |
5211df00 MR |
32 | /* |
33 | * While a 64-bit OS can make calls with SMC32 calling conventions, for some | |
029180b1 SH |
34 | * calls it is necessary to use SMC64 to pass or return 64-bit values. |
35 | * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate | |
36 | * (native-width) function ID. | |
5211df00 MR |
37 | */ |
38 | #ifdef CONFIG_64BIT | |
029180b1 | 39 | #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name |
5211df00 | 40 | #else |
029180b1 | 41 | #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name |
5211df00 MR |
42 | #endif |
43 | ||
bff60792 MR |
44 | /* |
45 | * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF | |
46 | * calls to its resident CPU, so we must avoid issuing those. We never migrate | |
47 | * a Trusted OS even if it claims to be capable of migration -- doing so will | |
48 | * require cooperation with a Trusted OS driver. | |
49 | */ | |
50 | static int resident_cpu = -1; | |
51 | ||
52 | bool psci_tos_resident_on(int cpu) | |
53 | { | |
54 | return cpu == resident_cpu; | |
55 | } | |
56 | ||
57 | struct psci_operations psci_ops; | |
58 | ||
59 | typedef unsigned long (psci_fn)(unsigned long, unsigned long, | |
60 | unsigned long, unsigned long); | |
61 | asmlinkage psci_fn __invoke_psci_fn_hvc; | |
62 | asmlinkage psci_fn __invoke_psci_fn_smc; | |
63 | static psci_fn *invoke_psci_fn; | |
64 | ||
65 | enum psci_function { | |
66 | PSCI_FN_CPU_SUSPEND, | |
67 | PSCI_FN_CPU_ON, | |
68 | PSCI_FN_CPU_OFF, | |
69 | PSCI_FN_MIGRATE, | |
70 | PSCI_FN_MAX, | |
71 | }; | |
72 | ||
73 | static u32 psci_function_id[PSCI_FN_MAX]; | |
74 | ||
068654c2 LP |
75 | #define PSCI_0_2_POWER_STATE_MASK \ |
76 | (PSCI_0_2_POWER_STATE_ID_MASK | \ | |
77 | PSCI_0_2_POWER_STATE_TYPE_MASK | \ | |
78 | PSCI_0_2_POWER_STATE_AFFL_MASK) | |
79 | ||
a5c00bb2 LP |
80 | #define PSCI_1_0_EXT_POWER_STATE_MASK \ |
81 | (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \ | |
82 | PSCI_1_0_EXT_POWER_STATE_TYPE_MASK) | |
83 | ||
84 | static u32 psci_cpu_suspend_feature; | |
85 | ||
86 | static inline bool psci_has_ext_power_state(void) | |
87 | { | |
88 | return psci_cpu_suspend_feature & | |
89 | PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK; | |
90 | } | |
91 | ||
068654c2 LP |
92 | bool psci_power_state_loses_context(u32 state) |
93 | { | |
a5c00bb2 LP |
94 | const u32 mask = psci_has_ext_power_state() ? |
95 | PSCI_1_0_EXT_POWER_STATE_TYPE_MASK : | |
96 | PSCI_0_2_POWER_STATE_TYPE_MASK; | |
97 | ||
98 | return state & mask; | |
068654c2 LP |
99 | } |
100 | ||
101 | bool psci_power_state_is_valid(u32 state) | |
102 | { | |
a5c00bb2 LP |
103 | const u32 valid_mask = psci_has_ext_power_state() ? |
104 | PSCI_1_0_EXT_POWER_STATE_MASK : | |
105 | PSCI_0_2_POWER_STATE_MASK; | |
106 | ||
107 | return !(state & ~valid_mask); | |
068654c2 LP |
108 | } |
109 | ||
bff60792 MR |
110 | static int psci_to_linux_errno(int errno) |
111 | { | |
112 | switch (errno) { | |
113 | case PSCI_RET_SUCCESS: | |
114 | return 0; | |
115 | case PSCI_RET_NOT_SUPPORTED: | |
116 | return -EOPNOTSUPP; | |
117 | case PSCI_RET_INVALID_PARAMS: | |
2217d7c6 | 118 | case PSCI_RET_INVALID_ADDRESS: |
bff60792 MR |
119 | return -EINVAL; |
120 | case PSCI_RET_DENIED: | |
121 | return -EPERM; | |
122 | }; | |
123 | ||
124 | return -EINVAL; | |
125 | } | |
126 | ||
127 | static u32 psci_get_version(void) | |
128 | { | |
129 | return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); | |
130 | } | |
131 | ||
132 | static int psci_cpu_suspend(u32 state, unsigned long entry_point) | |
133 | { | |
134 | int err; | |
135 | u32 fn; | |
136 | ||
137 | fn = psci_function_id[PSCI_FN_CPU_SUSPEND]; | |
138 | err = invoke_psci_fn(fn, state, entry_point, 0); | |
139 | return psci_to_linux_errno(err); | |
140 | } | |
141 | ||
142 | static int psci_cpu_off(u32 state) | |
143 | { | |
144 | int err; | |
145 | u32 fn; | |
146 | ||
147 | fn = psci_function_id[PSCI_FN_CPU_OFF]; | |
148 | err = invoke_psci_fn(fn, state, 0, 0); | |
149 | return psci_to_linux_errno(err); | |
150 | } | |
151 | ||
152 | static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point) | |
153 | { | |
154 | int err; | |
155 | u32 fn; | |
156 | ||
157 | fn = psci_function_id[PSCI_FN_CPU_ON]; | |
158 | err = invoke_psci_fn(fn, cpuid, entry_point, 0); | |
159 | return psci_to_linux_errno(err); | |
160 | } | |
161 | ||
162 | static int psci_migrate(unsigned long cpuid) | |
163 | { | |
164 | int err; | |
165 | u32 fn; | |
166 | ||
167 | fn = psci_function_id[PSCI_FN_MIGRATE]; | |
168 | err = invoke_psci_fn(fn, cpuid, 0, 0); | |
169 | return psci_to_linux_errno(err); | |
170 | } | |
171 | ||
172 | static int psci_affinity_info(unsigned long target_affinity, | |
173 | unsigned long lowest_affinity_level) | |
174 | { | |
029180b1 | 175 | return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO), |
5211df00 | 176 | target_affinity, lowest_affinity_level, 0); |
bff60792 MR |
177 | } |
178 | ||
179 | static int psci_migrate_info_type(void) | |
180 | { | |
181 | return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0); | |
182 | } | |
183 | ||
184 | static unsigned long psci_migrate_info_up_cpu(void) | |
185 | { | |
029180b1 | 186 | return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU), |
5211df00 | 187 | 0, 0, 0); |
bff60792 MR |
188 | } |
189 | ||
190 | static int get_set_conduit_method(struct device_node *np) | |
191 | { | |
192 | const char *method; | |
193 | ||
194 | pr_info("probing for conduit method from DT.\n"); | |
195 | ||
196 | if (of_property_read_string(np, "method", &method)) { | |
197 | pr_warn("missing \"method\" property\n"); | |
198 | return -ENXIO; | |
199 | } | |
200 | ||
201 | if (!strcmp("hvc", method)) { | |
202 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
203 | } else if (!strcmp("smc", method)) { | |
204 | invoke_psci_fn = __invoke_psci_fn_smc; | |
205 | } else { | |
206 | pr_warn("invalid \"method\" property: %s\n", method); | |
207 | return -EINVAL; | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) | |
213 | { | |
214 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); | |
215 | } | |
216 | ||
217 | static void psci_sys_poweroff(void) | |
218 | { | |
219 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); | |
220 | } | |
221 | ||
5f004e0c LP |
222 | static int __init psci_features(u32 psci_func_id) |
223 | { | |
224 | return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, | |
225 | psci_func_id, 0, 0); | |
226 | } | |
227 | ||
faf7ec4a SH |
228 | static int psci_system_suspend(unsigned long unused) |
229 | { | |
230 | return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND), | |
231 | virt_to_phys(cpu_resume), 0, 0); | |
232 | } | |
233 | ||
234 | static int psci_system_suspend_enter(suspend_state_t state) | |
235 | { | |
236 | return cpu_suspend(0, psci_system_suspend); | |
237 | } | |
238 | ||
239 | static const struct platform_suspend_ops psci_suspend_ops = { | |
240 | .valid = suspend_valid_only_mem, | |
241 | .enter = psci_system_suspend_enter, | |
242 | }; | |
243 | ||
244 | static void __init psci_init_system_suspend(void) | |
245 | { | |
246 | int ret; | |
247 | ||
248 | if (!IS_ENABLED(CONFIG_SUSPEND)) | |
249 | return; | |
250 | ||
251 | ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND)); | |
252 | ||
253 | if (ret != PSCI_RET_NOT_SUPPORTED) | |
254 | suspend_set_ops(&psci_suspend_ops); | |
255 | } | |
256 | ||
a5c00bb2 LP |
257 | static void __init psci_init_cpu_suspend(void) |
258 | { | |
259 | int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]); | |
260 | ||
261 | if (feature != PSCI_RET_NOT_SUPPORTED) | |
262 | psci_cpu_suspend_feature = feature; | |
263 | } | |
264 | ||
bff60792 MR |
265 | /* |
266 | * Detect the presence of a resident Trusted OS which may cause CPU_OFF to | |
267 | * return DENIED (which would be fatal). | |
268 | */ | |
269 | static void __init psci_init_migrate(void) | |
270 | { | |
271 | unsigned long cpuid; | |
272 | int type, cpu = -1; | |
273 | ||
274 | type = psci_ops.migrate_info_type(); | |
275 | ||
276 | if (type == PSCI_0_2_TOS_MP) { | |
277 | pr_info("Trusted OS migration not required\n"); | |
278 | return; | |
279 | } | |
280 | ||
281 | if (type == PSCI_RET_NOT_SUPPORTED) { | |
282 | pr_info("MIGRATE_INFO_TYPE not supported.\n"); | |
283 | return; | |
284 | } | |
285 | ||
286 | if (type != PSCI_0_2_TOS_UP_MIGRATE && | |
287 | type != PSCI_0_2_TOS_UP_NO_MIGRATE) { | |
288 | pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type); | |
289 | return; | |
290 | } | |
291 | ||
292 | cpuid = psci_migrate_info_up_cpu(); | |
293 | if (cpuid & ~MPIDR_HWID_BITMASK) { | |
294 | pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n", | |
295 | cpuid); | |
296 | return; | |
297 | } | |
298 | ||
299 | cpu = get_logical_index(cpuid); | |
300 | resident_cpu = cpu >= 0 ? cpu : -1; | |
301 | ||
302 | pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid); | |
303 | } | |
304 | ||
305 | static void __init psci_0_2_set_functions(void) | |
306 | { | |
307 | pr_info("Using standard PSCI v0.2 function IDs\n"); | |
029180b1 SH |
308 | psci_function_id[PSCI_FN_CPU_SUSPEND] = |
309 | PSCI_FN_NATIVE(0_2, CPU_SUSPEND); | |
bff60792 MR |
310 | psci_ops.cpu_suspend = psci_cpu_suspend; |
311 | ||
312 | psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF; | |
313 | psci_ops.cpu_off = psci_cpu_off; | |
314 | ||
029180b1 | 315 | psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON); |
bff60792 MR |
316 | psci_ops.cpu_on = psci_cpu_on; |
317 | ||
029180b1 | 318 | psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE); |
bff60792 MR |
319 | psci_ops.migrate = psci_migrate; |
320 | ||
321 | psci_ops.affinity_info = psci_affinity_info; | |
322 | ||
323 | psci_ops.migrate_info_type = psci_migrate_info_type; | |
324 | ||
325 | arm_pm_restart = psci_sys_reset; | |
326 | ||
327 | pm_power_off = psci_sys_poweroff; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Probe function for PSCI firmware versions >= 0.2 | |
332 | */ | |
333 | static int __init psci_probe(void) | |
334 | { | |
335 | u32 ver = psci_get_version(); | |
336 | ||
337 | pr_info("PSCIv%d.%d detected in firmware.\n", | |
338 | PSCI_VERSION_MAJOR(ver), | |
339 | PSCI_VERSION_MINOR(ver)); | |
340 | ||
341 | if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) { | |
342 | pr_err("Conflicting PSCI version detected.\n"); | |
343 | return -EINVAL; | |
344 | } | |
345 | ||
346 | psci_0_2_set_functions(); | |
347 | ||
348 | psci_init_migrate(); | |
349 | ||
79b04beb LP |
350 | if (PSCI_VERSION_MAJOR(ver) >= 1) { |
351 | psci_init_cpu_suspend(); | |
352 | psci_init_system_suspend(); | |
353 | } | |
faf7ec4a | 354 | |
bff60792 MR |
355 | return 0; |
356 | } | |
357 | ||
358 | typedef int (*psci_initcall_t)(const struct device_node *); | |
359 | ||
360 | /* | |
361 | * PSCI init function for PSCI versions >=0.2 | |
362 | * | |
363 | * Probe based on PSCI PSCI_VERSION function | |
364 | */ | |
365 | static int __init psci_0_2_init(struct device_node *np) | |
366 | { | |
367 | int err; | |
368 | ||
369 | err = get_set_conduit_method(np); | |
370 | ||
371 | if (err) | |
372 | goto out_put_node; | |
373 | /* | |
374 | * Starting with v0.2, the PSCI specification introduced a call | |
375 | * (PSCI_VERSION) that allows probing the firmware version, so | |
376 | * that PSCI function IDs and version specific initialization | |
377 | * can be carried out according to the specific version reported | |
378 | * by firmware | |
379 | */ | |
380 | err = psci_probe(); | |
381 | ||
382 | out_put_node: | |
383 | of_node_put(np); | |
384 | return err; | |
385 | } | |
386 | ||
387 | /* | |
388 | * PSCI < v0.2 get PSCI Function IDs via DT. | |
389 | */ | |
390 | static int __init psci_0_1_init(struct device_node *np) | |
391 | { | |
392 | u32 id; | |
393 | int err; | |
394 | ||
395 | err = get_set_conduit_method(np); | |
396 | ||
397 | if (err) | |
398 | goto out_put_node; | |
399 | ||
400 | pr_info("Using PSCI v0.1 Function IDs from DT\n"); | |
401 | ||
402 | if (!of_property_read_u32(np, "cpu_suspend", &id)) { | |
403 | psci_function_id[PSCI_FN_CPU_SUSPEND] = id; | |
404 | psci_ops.cpu_suspend = psci_cpu_suspend; | |
405 | } | |
406 | ||
407 | if (!of_property_read_u32(np, "cpu_off", &id)) { | |
408 | psci_function_id[PSCI_FN_CPU_OFF] = id; | |
409 | psci_ops.cpu_off = psci_cpu_off; | |
410 | } | |
411 | ||
412 | if (!of_property_read_u32(np, "cpu_on", &id)) { | |
413 | psci_function_id[PSCI_FN_CPU_ON] = id; | |
414 | psci_ops.cpu_on = psci_cpu_on; | |
415 | } | |
416 | ||
417 | if (!of_property_read_u32(np, "migrate", &id)) { | |
418 | psci_function_id[PSCI_FN_MIGRATE] = id; | |
419 | psci_ops.migrate = psci_migrate; | |
420 | } | |
421 | ||
422 | out_put_node: | |
423 | of_node_put(np); | |
424 | return err; | |
425 | } | |
426 | ||
c706c7eb | 427 | static const struct of_device_id const psci_of_match[] __initconst = { |
bff60792 MR |
428 | { .compatible = "arm,psci", .data = psci_0_1_init}, |
429 | { .compatible = "arm,psci-0.2", .data = psci_0_2_init}, | |
0fc197c7 | 430 | { .compatible = "arm,psci-1.0", .data = psci_0_2_init}, |
bff60792 MR |
431 | {}, |
432 | }; | |
433 | ||
434 | int __init psci_dt_init(void) | |
435 | { | |
436 | struct device_node *np; | |
437 | const struct of_device_id *matched_np; | |
438 | psci_initcall_t init_fn; | |
439 | ||
440 | np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np); | |
441 | ||
442 | if (!np) | |
443 | return -ENODEV; | |
444 | ||
445 | init_fn = (psci_initcall_t)matched_np->data; | |
446 | return init_fn(np); | |
447 | } | |
448 | ||
449 | #ifdef CONFIG_ACPI | |
450 | /* | |
451 | * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's | |
452 | * explicitly clarified in SBBR | |
453 | */ | |
454 | int __init psci_acpi_init(void) | |
455 | { | |
456 | if (!acpi_psci_present()) { | |
457 | pr_info("is not implemented in ACPI.\n"); | |
458 | return -EOPNOTSUPP; | |
459 | } | |
460 | ||
461 | pr_info("probing for conduit method from ACPI.\n"); | |
462 | ||
463 | if (acpi_psci_use_hvc()) | |
464 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
465 | else | |
466 | invoke_psci_fn = __invoke_psci_fn_smc; | |
467 | ||
468 | return psci_probe(); | |
469 | } | |
470 | #endif |