Commit | Line | Data |
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e790f1de WD |
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) 2013 ARM Limited | |
12 | * | |
13 | * Author: Will Deacon <will.deacon@arm.com> | |
14 | */ | |
15 | ||
16 | #define pr_fmt(fmt) "psci: " fmt | |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/of.h> | |
00ef54bb | 20 | #include <linux/smp.h> |
e71246a2 AC |
21 | #include <linux/reboot.h> |
22 | #include <linux/pm.h> | |
c814ca02 | 23 | #include <linux/delay.h> |
e71246a2 | 24 | #include <uapi/linux/psci.h> |
e790f1de WD |
25 | |
26 | #include <asm/compiler.h> | |
cd1aebf5 | 27 | #include <asm/cpu_ops.h> |
e790f1de WD |
28 | #include <asm/errno.h> |
29 | #include <asm/psci.h> | |
00ef54bb | 30 | #include <asm/smp_plat.h> |
e71246a2 | 31 | #include <asm/system_misc.h> |
e790f1de | 32 | |
00ef54bb MR |
33 | #define PSCI_POWER_STATE_TYPE_STANDBY 0 |
34 | #define PSCI_POWER_STATE_TYPE_POWER_DOWN 1 | |
35 | ||
36 | struct psci_power_state { | |
37 | u16 id; | |
38 | u8 type; | |
39 | u8 affinity_level; | |
40 | }; | |
41 | ||
42 | struct psci_operations { | |
43 | int (*cpu_suspend)(struct psci_power_state state, | |
44 | unsigned long entry_point); | |
45 | int (*cpu_off)(struct psci_power_state state); | |
46 | int (*cpu_on)(unsigned long cpuid, unsigned long entry_point); | |
47 | int (*migrate)(unsigned long cpuid); | |
e71246a2 AC |
48 | int (*affinity_info)(unsigned long target_affinity, |
49 | unsigned long lowest_affinity_level); | |
50 | int (*migrate_info_type)(void); | |
00ef54bb MR |
51 | }; |
52 | ||
53 | static struct psci_operations psci_ops; | |
e790f1de WD |
54 | |
55 | static int (*invoke_psci_fn)(u64, u64, u64, u64); | |
e71246a2 | 56 | typedef int (*psci_initcall_t)(const struct device_node *); |
e790f1de WD |
57 | |
58 | enum psci_function { | |
59 | PSCI_FN_CPU_SUSPEND, | |
60 | PSCI_FN_CPU_ON, | |
61 | PSCI_FN_CPU_OFF, | |
62 | PSCI_FN_MIGRATE, | |
e71246a2 AC |
63 | PSCI_FN_AFFINITY_INFO, |
64 | PSCI_FN_MIGRATE_INFO_TYPE, | |
e790f1de WD |
65 | PSCI_FN_MAX, |
66 | }; | |
67 | ||
68 | static u32 psci_function_id[PSCI_FN_MAX]; | |
69 | ||
e790f1de WD |
70 | static int psci_to_linux_errno(int errno) |
71 | { | |
72 | switch (errno) { | |
73 | case PSCI_RET_SUCCESS: | |
74 | return 0; | |
e71246a2 | 75 | case PSCI_RET_NOT_SUPPORTED: |
e790f1de | 76 | return -EOPNOTSUPP; |
e71246a2 | 77 | case PSCI_RET_INVALID_PARAMS: |
e790f1de | 78 | return -EINVAL; |
e71246a2 | 79 | case PSCI_RET_DENIED: |
e790f1de WD |
80 | return -EPERM; |
81 | }; | |
82 | ||
83 | return -EINVAL; | |
84 | } | |
85 | ||
e790f1de WD |
86 | static u32 psci_power_state_pack(struct psci_power_state state) |
87 | { | |
e71246a2 AC |
88 | return ((state.id << PSCI_0_2_POWER_STATE_ID_SHIFT) |
89 | & PSCI_0_2_POWER_STATE_ID_MASK) | | |
90 | ((state.type << PSCI_0_2_POWER_STATE_TYPE_SHIFT) | |
91 | & PSCI_0_2_POWER_STATE_TYPE_MASK) | | |
92 | ((state.affinity_level << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | |
93 | & PSCI_0_2_POWER_STATE_AFFL_MASK); | |
e790f1de WD |
94 | } |
95 | ||
96 | /* | |
97 | * The following two functions are invoked via the invoke_psci_fn pointer | |
98 | * and will not be inlined, allowing us to piggyback on the AAPCS. | |
99 | */ | |
100 | static noinline int __invoke_psci_fn_hvc(u64 function_id, u64 arg0, u64 arg1, | |
101 | u64 arg2) | |
102 | { | |
103 | asm volatile( | |
104 | __asmeq("%0", "x0") | |
105 | __asmeq("%1", "x1") | |
106 | __asmeq("%2", "x2") | |
107 | __asmeq("%3", "x3") | |
108 | "hvc #0\n" | |
109 | : "+r" (function_id) | |
110 | : "r" (arg0), "r" (arg1), "r" (arg2)); | |
111 | ||
112 | return function_id; | |
113 | } | |
114 | ||
115 | static noinline int __invoke_psci_fn_smc(u64 function_id, u64 arg0, u64 arg1, | |
116 | u64 arg2) | |
117 | { | |
118 | asm volatile( | |
119 | __asmeq("%0", "x0") | |
120 | __asmeq("%1", "x1") | |
121 | __asmeq("%2", "x2") | |
122 | __asmeq("%3", "x3") | |
123 | "smc #0\n" | |
124 | : "+r" (function_id) | |
125 | : "r" (arg0), "r" (arg1), "r" (arg2)); | |
126 | ||
127 | return function_id; | |
128 | } | |
129 | ||
e71246a2 AC |
130 | static int psci_get_version(void) |
131 | { | |
132 | int err; | |
133 | ||
134 | err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); | |
135 | return err; | |
136 | } | |
137 | ||
e790f1de WD |
138 | static int psci_cpu_suspend(struct psci_power_state state, |
139 | unsigned long entry_point) | |
140 | { | |
141 | int err; | |
142 | u32 fn, power_state; | |
143 | ||
144 | fn = psci_function_id[PSCI_FN_CPU_SUSPEND]; | |
145 | power_state = psci_power_state_pack(state); | |
146 | err = invoke_psci_fn(fn, power_state, entry_point, 0); | |
147 | return psci_to_linux_errno(err); | |
148 | } | |
149 | ||
150 | static int psci_cpu_off(struct psci_power_state state) | |
151 | { | |
152 | int err; | |
153 | u32 fn, power_state; | |
154 | ||
155 | fn = psci_function_id[PSCI_FN_CPU_OFF]; | |
156 | power_state = psci_power_state_pack(state); | |
157 | err = invoke_psci_fn(fn, power_state, 0, 0); | |
158 | return psci_to_linux_errno(err); | |
159 | } | |
160 | ||
161 | static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point) | |
162 | { | |
163 | int err; | |
164 | u32 fn; | |
165 | ||
166 | fn = psci_function_id[PSCI_FN_CPU_ON]; | |
167 | err = invoke_psci_fn(fn, cpuid, entry_point, 0); | |
168 | return psci_to_linux_errno(err); | |
169 | } | |
170 | ||
171 | static int psci_migrate(unsigned long cpuid) | |
172 | { | |
173 | int err; | |
174 | u32 fn; | |
175 | ||
176 | fn = psci_function_id[PSCI_FN_MIGRATE]; | |
177 | err = invoke_psci_fn(fn, cpuid, 0, 0); | |
178 | return psci_to_linux_errno(err); | |
179 | } | |
180 | ||
e71246a2 AC |
181 | static int psci_affinity_info(unsigned long target_affinity, |
182 | unsigned long lowest_affinity_level) | |
183 | { | |
184 | int err; | |
185 | u32 fn; | |
e790f1de | 186 | |
e71246a2 AC |
187 | fn = psci_function_id[PSCI_FN_AFFINITY_INFO]; |
188 | err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0); | |
189 | return err; | |
190 | } | |
191 | ||
192 | static int psci_migrate_info_type(void) | |
e790f1de | 193 | { |
e71246a2 AC |
194 | int err; |
195 | u32 fn; | |
e790f1de | 196 | |
e71246a2 AC |
197 | fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE]; |
198 | err = invoke_psci_fn(fn, 0, 0, 0); | |
199 | return err; | |
200 | } | |
e790f1de | 201 | |
e71246a2 AC |
202 | static int get_set_conduit_method(struct device_node *np) |
203 | { | |
204 | const char *method; | |
205 | ||
206 | pr_info("probing for conduit method from DT.\n"); | |
e790f1de WD |
207 | |
208 | if (of_property_read_string(np, "method", &method)) { | |
e71246a2 AC |
209 | pr_warn("missing \"method\" property\n"); |
210 | return -ENXIO; | |
e790f1de WD |
211 | } |
212 | ||
213 | if (!strcmp("hvc", method)) { | |
214 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
215 | } else if (!strcmp("smc", method)) { | |
216 | invoke_psci_fn = __invoke_psci_fn_smc; | |
217 | } else { | |
e71246a2 AC |
218 | pr_warn("invalid \"method\" property: %s\n", method); |
219 | return -EINVAL; | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) | |
225 | { | |
226 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); | |
227 | } | |
228 | ||
229 | static void psci_sys_poweroff(void) | |
230 | { | |
231 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); | |
232 | } | |
233 | ||
234 | /* | |
235 | * PSCI Function IDs for v0.2+ are well defined so use | |
236 | * standard values. | |
237 | */ | |
238 | static int psci_0_2_init(struct device_node *np) | |
239 | { | |
240 | int err, ver; | |
241 | ||
242 | err = get_set_conduit_method(np); | |
243 | ||
244 | if (err) | |
e790f1de | 245 | goto out_put_node; |
e71246a2 AC |
246 | |
247 | ver = psci_get_version(); | |
248 | ||
249 | if (ver == PSCI_RET_NOT_SUPPORTED) { | |
250 | /* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */ | |
251 | pr_err("PSCI firmware does not comply with the v0.2 spec.\n"); | |
252 | err = -EOPNOTSUPP; | |
253 | goto out_put_node; | |
254 | } else { | |
255 | pr_info("PSCIv%d.%d detected in firmware.\n", | |
256 | PSCI_VERSION_MAJOR(ver), | |
257 | PSCI_VERSION_MINOR(ver)); | |
258 | ||
259 | if (PSCI_VERSION_MAJOR(ver) == 0 && | |
260 | PSCI_VERSION_MINOR(ver) < 2) { | |
261 | err = -EINVAL; | |
262 | pr_err("Conflicting PSCI version detected.\n"); | |
263 | goto out_put_node; | |
264 | } | |
e790f1de WD |
265 | } |
266 | ||
e71246a2 AC |
267 | pr_info("Using standard PSCI v0.2 function IDs\n"); |
268 | psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN64_CPU_SUSPEND; | |
269 | psci_ops.cpu_suspend = psci_cpu_suspend; | |
270 | ||
271 | psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF; | |
272 | psci_ops.cpu_off = psci_cpu_off; | |
273 | ||
274 | psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN64_CPU_ON; | |
275 | psci_ops.cpu_on = psci_cpu_on; | |
276 | ||
277 | psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN64_MIGRATE; | |
278 | psci_ops.migrate = psci_migrate; | |
279 | ||
280 | psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN64_AFFINITY_INFO; | |
281 | psci_ops.affinity_info = psci_affinity_info; | |
282 | ||
283 | psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] = | |
284 | PSCI_0_2_FN_MIGRATE_INFO_TYPE; | |
285 | psci_ops.migrate_info_type = psci_migrate_info_type; | |
286 | ||
287 | arm_pm_restart = psci_sys_reset; | |
288 | ||
289 | pm_power_off = psci_sys_poweroff; | |
290 | ||
291 | out_put_node: | |
292 | of_node_put(np); | |
293 | return err; | |
294 | } | |
295 | ||
296 | /* | |
297 | * PSCI < v0.2 get PSCI Function IDs via DT. | |
298 | */ | |
299 | static int psci_0_1_init(struct device_node *np) | |
300 | { | |
301 | u32 id; | |
302 | int err; | |
303 | ||
304 | err = get_set_conduit_method(np); | |
305 | ||
306 | if (err) | |
307 | goto out_put_node; | |
308 | ||
309 | pr_info("Using PSCI v0.1 Function IDs from DT\n"); | |
310 | ||
e790f1de WD |
311 | if (!of_property_read_u32(np, "cpu_suspend", &id)) { |
312 | psci_function_id[PSCI_FN_CPU_SUSPEND] = id; | |
313 | psci_ops.cpu_suspend = psci_cpu_suspend; | |
314 | } | |
315 | ||
316 | if (!of_property_read_u32(np, "cpu_off", &id)) { | |
317 | psci_function_id[PSCI_FN_CPU_OFF] = id; | |
318 | psci_ops.cpu_off = psci_cpu_off; | |
319 | } | |
320 | ||
321 | if (!of_property_read_u32(np, "cpu_on", &id)) { | |
322 | psci_function_id[PSCI_FN_CPU_ON] = id; | |
323 | psci_ops.cpu_on = psci_cpu_on; | |
324 | } | |
325 | ||
326 | if (!of_property_read_u32(np, "migrate", &id)) { | |
327 | psci_function_id[PSCI_FN_MIGRATE] = id; | |
328 | psci_ops.migrate = psci_migrate; | |
329 | } | |
330 | ||
331 | out_put_node: | |
332 | of_node_put(np); | |
e71246a2 AC |
333 | return err; |
334 | } | |
335 | ||
336 | static const struct of_device_id psci_of_match[] __initconst = { | |
337 | { .compatible = "arm,psci", .data = psci_0_1_init}, | |
338 | { .compatible = "arm,psci-0.2", .data = psci_0_2_init}, | |
339 | {}, | |
340 | }; | |
341 | ||
342 | int __init psci_init(void) | |
343 | { | |
344 | struct device_node *np; | |
345 | const struct of_device_id *matched_np; | |
346 | psci_initcall_t init_fn; | |
347 | ||
348 | np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np); | |
349 | ||
350 | if (!np) | |
351 | return -ENODEV; | |
352 | ||
353 | init_fn = (psci_initcall_t)matched_np->data; | |
354 | return init_fn(np); | |
e790f1de | 355 | } |
00ef54bb MR |
356 | |
357 | #ifdef CONFIG_SMP | |
358 | ||
cd1aebf5 | 359 | static int __init cpu_psci_cpu_init(struct device_node *dn, unsigned int cpu) |
00ef54bb MR |
360 | { |
361 | return 0; | |
362 | } | |
363 | ||
cd1aebf5 | 364 | static int __init cpu_psci_cpu_prepare(unsigned int cpu) |
00ef54bb | 365 | { |
00ef54bb MR |
366 | if (!psci_ops.cpu_on) { |
367 | pr_err("no cpu_on method, not booting CPU%d\n", cpu); | |
368 | return -ENODEV; | |
369 | } | |
370 | ||
00ef54bb MR |
371 | return 0; |
372 | } | |
373 | ||
652af899 MR |
374 | static int cpu_psci_cpu_boot(unsigned int cpu) |
375 | { | |
376 | int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa(secondary_entry)); | |
377 | if (err) | |
288ac26c | 378 | pr_err("failed to boot CPU%d (%d)\n", cpu, err); |
652af899 MR |
379 | |
380 | return err; | |
381 | } | |
382 | ||
831ccf79 MR |
383 | #ifdef CONFIG_HOTPLUG_CPU |
384 | static int cpu_psci_cpu_disable(unsigned int cpu) | |
385 | { | |
386 | /* Fail early if we don't have CPU_OFF support */ | |
387 | if (!psci_ops.cpu_off) | |
388 | return -EOPNOTSUPP; | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static void cpu_psci_cpu_die(unsigned int cpu) | |
393 | { | |
394 | int ret; | |
395 | /* | |
396 | * There are no known implementations of PSCI actually using the | |
397 | * power state field, pass a sensible default for now. | |
398 | */ | |
399 | struct psci_power_state state = { | |
400 | .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, | |
401 | }; | |
402 | ||
403 | ret = psci_ops.cpu_off(state); | |
404 | ||
288ac26c | 405 | pr_crit("unable to power off CPU%u (%d)\n", cpu, ret); |
831ccf79 | 406 | } |
c814ca02 AC |
407 | |
408 | static int cpu_psci_cpu_kill(unsigned int cpu) | |
409 | { | |
410 | int err, i; | |
411 | ||
412 | if (!psci_ops.affinity_info) | |
413 | return 1; | |
414 | /* | |
415 | * cpu_kill could race with cpu_die and we can | |
416 | * potentially end up declaring this cpu undead | |
417 | * while it is dying. So, try again a few times. | |
418 | */ | |
419 | ||
420 | for (i = 0; i < 10; i++) { | |
421 | err = psci_ops.affinity_info(cpu_logical_map(cpu), 0); | |
422 | if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) { | |
423 | pr_info("CPU%d killed.\n", cpu); | |
424 | return 1; | |
425 | } | |
426 | ||
427 | msleep(10); | |
428 | pr_info("Retrying again to check for CPU kill\n"); | |
429 | } | |
430 | ||
431 | pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n", | |
432 | cpu, err); | |
433 | /* Make op_cpu_kill() fail. */ | |
434 | return 0; | |
435 | } | |
831ccf79 MR |
436 | #endif |
437 | ||
cd1aebf5 | 438 | const struct cpu_operations cpu_psci_ops = { |
00ef54bb | 439 | .name = "psci", |
cd1aebf5 MR |
440 | .cpu_init = cpu_psci_cpu_init, |
441 | .cpu_prepare = cpu_psci_cpu_prepare, | |
652af899 | 442 | .cpu_boot = cpu_psci_cpu_boot, |
831ccf79 MR |
443 | #ifdef CONFIG_HOTPLUG_CPU |
444 | .cpu_disable = cpu_psci_cpu_disable, | |
445 | .cpu_die = cpu_psci_cpu_die, | |
c814ca02 | 446 | .cpu_kill = cpu_psci_cpu_kill, |
831ccf79 | 447 | #endif |
00ef54bb MR |
448 | }; |
449 | ||
450 | #endif |