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) 2012 ARM Limited
13 * Author: Will Deacon <will.deacon@arm.com>
16 #define pr_fmt(fmt) "psci: " fmt
18 #include <linux/init.h>
20 #include <linux/reboot.h>
22 #include <uapi/linux/psci.h>
24 #include <asm/compiler.h>
25 #include <asm/errno.h>
27 #include <asm/system_misc.h>
29 struct psci_operations psci_ops;
31 static int (*invoke_psci_fn)(u32, u32, u32, u32);
32 typedef int (*psci_initcall_t)(const struct device_node *);
34 asmlinkage int __invoke_psci_fn_hvc(u32, u32, u32, u32);
35 asmlinkage int __invoke_psci_fn_smc(u32, u32, u32, u32);
42 PSCI_FN_AFFINITY_INFO,
43 PSCI_FN_MIGRATE_INFO_TYPE,
47 static u32 psci_function_id[PSCI_FN_MAX];
49 static int psci_to_linux_errno(int errno)
52 case PSCI_RET_SUCCESS:
54 case PSCI_RET_NOT_SUPPORTED:
56 case PSCI_RET_INVALID_PARAMS:
65 static u32 psci_power_state_pack(struct psci_power_state state)
67 return ((state.id << PSCI_0_2_POWER_STATE_ID_SHIFT)
68 & PSCI_0_2_POWER_STATE_ID_MASK) |
69 ((state.type << PSCI_0_2_POWER_STATE_TYPE_SHIFT)
70 & PSCI_0_2_POWER_STATE_TYPE_MASK) |
71 ((state.affinity_level << PSCI_0_2_POWER_STATE_AFFL_SHIFT)
72 & PSCI_0_2_POWER_STATE_AFFL_MASK);
75 static int psci_get_version(void)
79 err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
83 static int psci_cpu_suspend(struct psci_power_state state,
84 unsigned long entry_point)
89 fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
90 power_state = psci_power_state_pack(state);
91 err = invoke_psci_fn(fn, power_state, entry_point, 0);
92 return psci_to_linux_errno(err);
95 static int psci_cpu_off(struct psci_power_state state)
100 fn = psci_function_id[PSCI_FN_CPU_OFF];
101 power_state = psci_power_state_pack(state);
102 err = invoke_psci_fn(fn, power_state, 0, 0);
103 return psci_to_linux_errno(err);
106 static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
111 fn = psci_function_id[PSCI_FN_CPU_ON];
112 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
113 return psci_to_linux_errno(err);
116 static int psci_migrate(unsigned long cpuid)
121 fn = psci_function_id[PSCI_FN_MIGRATE];
122 err = invoke_psci_fn(fn, cpuid, 0, 0);
123 return psci_to_linux_errno(err);
126 static int psci_affinity_info(unsigned long target_affinity,
127 unsigned long lowest_affinity_level)
132 fn = psci_function_id[PSCI_FN_AFFINITY_INFO];
133 err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0);
137 static int psci_migrate_info_type(void)
142 fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
143 err = invoke_psci_fn(fn, 0, 0, 0);
147 static int get_set_conduit_method(struct device_node *np)
151 pr_info("probing for conduit method from DT.\n");
153 if (of_property_read_string(np, "method", &method)) {
154 pr_warn("missing \"method\" property\n");
158 if (!strcmp("hvc", method)) {
159 invoke_psci_fn = __invoke_psci_fn_hvc;
160 } else if (!strcmp("smc", method)) {
161 invoke_psci_fn = __invoke_psci_fn_smc;
163 pr_warn("invalid \"method\" property: %s\n", method);
169 static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
171 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
174 static void psci_sys_poweroff(void)
176 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
180 * PSCI Function IDs for v0.2+ are well defined so use
183 static int psci_0_2_init(struct device_node *np)
187 err = get_set_conduit_method(np);
192 ver = psci_get_version();
194 if (ver == PSCI_RET_NOT_SUPPORTED) {
195 /* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */
196 pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
200 pr_info("PSCIv%d.%d detected in firmware.\n",
201 PSCI_VERSION_MAJOR(ver),
202 PSCI_VERSION_MINOR(ver));
204 if (PSCI_VERSION_MAJOR(ver) == 0 &&
205 PSCI_VERSION_MINOR(ver) < 2) {
207 pr_err("Conflicting PSCI version detected.\n");
212 pr_info("Using standard PSCI v0.2 function IDs\n");
213 psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_CPU_SUSPEND;
214 psci_ops.cpu_suspend = psci_cpu_suspend;
216 psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
217 psci_ops.cpu_off = psci_cpu_off;
219 psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN_CPU_ON;
220 psci_ops.cpu_on = psci_cpu_on;
222 psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_MIGRATE;
223 psci_ops.migrate = psci_migrate;
225 psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN_AFFINITY_INFO;
226 psci_ops.affinity_info = psci_affinity_info;
228 psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] =
229 PSCI_0_2_FN_MIGRATE_INFO_TYPE;
230 psci_ops.migrate_info_type = psci_migrate_info_type;
232 arm_pm_restart = psci_sys_reset;
234 pm_power_off = psci_sys_poweroff;
242 * PSCI < v0.2 get PSCI Function IDs via DT.
244 static int psci_0_1_init(struct device_node *np)
249 err = get_set_conduit_method(np);
254 pr_info("Using PSCI v0.1 Function IDs from DT\n");
256 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
257 psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
258 psci_ops.cpu_suspend = psci_cpu_suspend;
261 if (!of_property_read_u32(np, "cpu_off", &id)) {
262 psci_function_id[PSCI_FN_CPU_OFF] = id;
263 psci_ops.cpu_off = psci_cpu_off;
266 if (!of_property_read_u32(np, "cpu_on", &id)) {
267 psci_function_id[PSCI_FN_CPU_ON] = id;
268 psci_ops.cpu_on = psci_cpu_on;
271 if (!of_property_read_u32(np, "migrate", &id)) {
272 psci_function_id[PSCI_FN_MIGRATE] = id;
273 psci_ops.migrate = psci_migrate;
281 static const struct of_device_id psci_of_match[] __initconst = {
282 { .compatible = "arm,psci", .data = psci_0_1_init},
283 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
287 int __init psci_init(void)
289 struct device_node *np;
290 const struct of_device_id *matched_np;
291 psci_initcall_t init_fn;
293 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
297 init_fn = (psci_initcall_t)matched_np->data;