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.
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.
11 * Copyright (C) 2013 ARM Limited
13 * Author: Will Deacon <will.deacon@arm.com>
16 #define pr_fmt(fmt) "psci: " fmt
18 #include <linux/cpuidle.h>
19 #include <linux/init.h>
21 #include <linux/smp.h>
22 #include <linux/slab.h>
23 #include <linux/reboot.h>
25 #include <linux/delay.h>
26 #include <uapi/linux/psci.h>
28 #include <asm/compiler.h>
29 #include <asm/cpu_ops.h>
30 #include <asm/errno.h>
32 #include <asm/smp_plat.h>
33 #include <asm/suspend.h>
34 #include <asm/system_misc.h>
36 #define PSCI_POWER_STATE_TYPE_STANDBY 0
37 #define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
39 struct psci_power_state {
45 struct psci_operations {
46 int (*cpu_suspend)(struct psci_power_state state,
47 unsigned long entry_point);
48 int (*cpu_off)(struct psci_power_state state);
49 int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
50 int (*migrate)(unsigned long cpuid);
51 int (*affinity_info)(unsigned long target_affinity,
52 unsigned long lowest_affinity_level);
53 int (*migrate_info_type)(void);
56 static struct psci_operations psci_ops;
58 static int (*invoke_psci_fn)(u64, u64, u64, u64);
59 typedef int (*psci_initcall_t)(const struct device_node *);
61 asmlinkage int __invoke_psci_fn_hvc(u64, u64, u64, u64);
62 asmlinkage int __invoke_psci_fn_smc(u64, u64, u64, u64);
69 PSCI_FN_AFFINITY_INFO,
70 PSCI_FN_MIGRATE_INFO_TYPE,
74 static DEFINE_PER_CPU_READ_MOSTLY(struct psci_power_state *, psci_power_state);
76 static u32 psci_function_id[PSCI_FN_MAX];
78 static int psci_to_linux_errno(int errno)
81 case PSCI_RET_SUCCESS:
83 case PSCI_RET_NOT_SUPPORTED:
85 case PSCI_RET_INVALID_PARAMS:
94 static u32 psci_power_state_pack(struct psci_power_state state)
96 return ((state.id << PSCI_0_2_POWER_STATE_ID_SHIFT)
97 & PSCI_0_2_POWER_STATE_ID_MASK) |
98 ((state.type << PSCI_0_2_POWER_STATE_TYPE_SHIFT)
99 & PSCI_0_2_POWER_STATE_TYPE_MASK) |
100 ((state.affinity_level << PSCI_0_2_POWER_STATE_AFFL_SHIFT)
101 & PSCI_0_2_POWER_STATE_AFFL_MASK);
104 static void psci_power_state_unpack(u32 power_state,
105 struct psci_power_state *state)
107 state->id = (power_state >> PSCI_0_2_POWER_STATE_ID_SHIFT)
108 & PSCI_0_2_POWER_STATE_ID_MASK;
109 state->type = (power_state >> PSCI_0_2_POWER_STATE_TYPE_SHIFT)
110 & PSCI_0_2_POWER_STATE_TYPE_MASK;
111 state->affinity_level = (power_state >> PSCI_0_2_POWER_STATE_AFFL_SHIFT)
112 & PSCI_0_2_POWER_STATE_AFFL_MASK;
115 static int psci_get_version(void)
119 err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
123 static int psci_cpu_suspend(struct psci_power_state state,
124 unsigned long entry_point)
129 fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
130 power_state = psci_power_state_pack(state);
131 err = invoke_psci_fn(fn, power_state, entry_point, 0);
132 return psci_to_linux_errno(err);
135 static int psci_cpu_off(struct psci_power_state state)
140 fn = psci_function_id[PSCI_FN_CPU_OFF];
141 power_state = psci_power_state_pack(state);
142 err = invoke_psci_fn(fn, power_state, 0, 0);
143 return psci_to_linux_errno(err);
146 static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
151 fn = psci_function_id[PSCI_FN_CPU_ON];
152 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
153 return psci_to_linux_errno(err);
156 static int psci_migrate(unsigned long cpuid)
161 fn = psci_function_id[PSCI_FN_MIGRATE];
162 err = invoke_psci_fn(fn, cpuid, 0, 0);
163 return psci_to_linux_errno(err);
166 static int psci_affinity_info(unsigned long target_affinity,
167 unsigned long lowest_affinity_level)
172 fn = psci_function_id[PSCI_FN_AFFINITY_INFO];
173 err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0);
177 static int psci_migrate_info_type(void)
182 fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
183 err = invoke_psci_fn(fn, 0, 0, 0);
187 static int get_set_conduit_method(struct device_node *np)
191 pr_info("probing for conduit method from DT.\n");
193 if (of_property_read_string(np, "method", &method)) {
194 pr_warn("missing \"method\" property\n");
198 if (!strcmp("hvc", method)) {
199 invoke_psci_fn = __invoke_psci_fn_hvc;
200 } else if (!strcmp("smc", method)) {
201 invoke_psci_fn = __invoke_psci_fn_smc;
203 pr_warn("invalid \"method\" property: %s\n", method);
209 static void psci_sys_reset(char str, const char *cmd)
211 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
214 static void psci_sys_poweroff(void)
216 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
220 * PSCI Function IDs for v0.2+ are well defined so use
223 static int __init psci_0_2_init(struct device_node *np)
227 err = get_set_conduit_method(np);
232 ver = psci_get_version();
234 if (ver == PSCI_RET_NOT_SUPPORTED) {
235 /* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */
236 pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
240 pr_info("PSCIv%d.%d detected in firmware.\n",
241 PSCI_VERSION_MAJOR(ver),
242 PSCI_VERSION_MINOR(ver));
244 if (PSCI_VERSION_MAJOR(ver) == 0 &&
245 PSCI_VERSION_MINOR(ver) < 2) {
247 pr_err("Conflicting PSCI version detected.\n");
252 pr_info("Using standard PSCI v0.2 function IDs\n");
253 psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN64_CPU_SUSPEND;
254 psci_ops.cpu_suspend = psci_cpu_suspend;
256 psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
257 psci_ops.cpu_off = psci_cpu_off;
259 psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN64_CPU_ON;
260 psci_ops.cpu_on = psci_cpu_on;
262 psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN64_MIGRATE;
263 psci_ops.migrate = psci_migrate;
265 psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN64_AFFINITY_INFO;
266 psci_ops.affinity_info = psci_affinity_info;
268 psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] =
269 PSCI_0_2_FN_MIGRATE_INFO_TYPE;
270 psci_ops.migrate_info_type = psci_migrate_info_type;
272 arm_pm_restart = psci_sys_reset;
274 pm_power_off = psci_sys_poweroff;
282 * PSCI < v0.2 get PSCI Function IDs via DT.
284 static int __init psci_0_1_init(struct device_node *np)
289 err = get_set_conduit_method(np);
294 pr_info("Using PSCI v0.1 Function IDs from DT\n");
296 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
297 psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
298 psci_ops.cpu_suspend = psci_cpu_suspend;
301 if (!of_property_read_u32(np, "cpu_off", &id)) {
302 psci_function_id[PSCI_FN_CPU_OFF] = id;
303 psci_ops.cpu_off = psci_cpu_off;
306 if (!of_property_read_u32(np, "cpu_on", &id)) {
307 psci_function_id[PSCI_FN_CPU_ON] = id;
308 psci_ops.cpu_on = psci_cpu_on;
311 if (!of_property_read_u32(np, "migrate", &id)) {
312 psci_function_id[PSCI_FN_MIGRATE] = id;
313 psci_ops.migrate = psci_migrate;
321 static const struct of_device_id psci_of_match[] __initconst = {
322 { .compatible = "arm,psci", .data = psci_0_1_init},
323 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
327 int __init psci_init(void)
329 struct device_node *np;
330 const struct of_device_id *matched_np;
331 psci_initcall_t init_fn;
333 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
338 init_fn = (psci_initcall_t)matched_np->data;
344 static int __init cpu_psci_cpu_init(struct device_node *dn, unsigned int cpu)
349 static int __init cpu_psci_cpu_prepare(unsigned int cpu)
351 if (!psci_ops.cpu_on) {
352 pr_err("no cpu_on method, not booting CPU%d\n", cpu);
359 static int cpu_psci_cpu_boot(unsigned int cpu)
361 int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa(secondary_entry));
363 pr_err("failed to boot CPU%d (%d)\n", cpu, err);
368 #ifdef CONFIG_HOTPLUG_CPU
369 static int cpu_psci_cpu_disable(unsigned int cpu)
371 /* Fail early if we don't have CPU_OFF support */
372 if (!psci_ops.cpu_off)
377 static void cpu_psci_cpu_die(unsigned int cpu)
381 * There are no known implementations of PSCI actually using the
382 * power state field, pass a sensible default for now.
384 struct psci_power_state state = {
385 .type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
388 ret = psci_ops.cpu_off(state);
390 pr_crit("unable to power off CPU%u (%d)\n", cpu, ret);
393 static int cpu_psci_cpu_kill(unsigned int cpu)
397 if (!psci_ops.affinity_info)
400 * cpu_kill could race with cpu_die and we can
401 * potentially end up declaring this cpu undead
402 * while it is dying. So, try again a few times.
405 for (i = 0; i < 10; i++) {
406 err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
407 if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
408 pr_info("CPU%d killed.\n", cpu);
413 pr_info("Retrying again to check for CPU kill\n");
416 pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
418 /* Make op_cpu_kill() fail. */
424 #ifdef CONFIG_ARM64_CPU_SUSPEND
425 static int cpu_psci_cpu_suspend(unsigned long index)
427 struct psci_power_state *state = __get_cpu_var(psci_power_state);
432 return psci_ops.cpu_suspend(state[index], virt_to_phys(cpu_resume));
436 const struct cpu_operations cpu_psci_ops = {
439 .cpu_init = cpu_psci_cpu_init,
440 .cpu_prepare = cpu_psci_cpu_prepare,
441 .cpu_boot = cpu_psci_cpu_boot,
442 #ifdef CONFIG_HOTPLUG_CPU
443 .cpu_disable = cpu_psci_cpu_disable,
444 .cpu_die = cpu_psci_cpu_die,
445 .cpu_kill = cpu_psci_cpu_kill,
448 #ifdef CONFIG_ARM64_CPU_SUSPEND
449 .cpu_suspend = cpu_psci_cpu_suspend,