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) 2015 ARM Limited
14 #define pr_fmt(fmt) "psci: " fmt
16 #include <linux/errno.h>
17 #include <linux/linkage.h>
20 #include <linux/printk.h>
21 #include <linux/psci.h>
22 #include <linux/reboot.h>
23 #include <linux/suspend.h>
24 #include <linux/regulator/machine.h>
26 #include <uapi/linux/psci.h>
28 #include <asm/cputype.h>
29 #include <asm/system_misc.h>
30 #include <asm/smp_plat.h>
31 #include <asm/suspend.h>
34 * While a 64-bit OS can make calls with SMC32 calling conventions, for some
35 * calls it is necessary to use SMC64 to pass or return 64-bit values.
36 * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
37 * (native-width) function ID.
40 #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
42 #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
46 * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
47 * calls to its resident CPU, so we must avoid issuing those. We never migrate
48 * a Trusted OS even if it claims to be capable of migration -- doing so will
49 * require cooperation with a Trusted OS driver.
51 static int resident_cpu = -1;
53 bool psci_tos_resident_on(int cpu)
55 return cpu == resident_cpu;
58 struct psci_operations psci_ops;
60 typedef unsigned long (psci_fn)(unsigned long, unsigned long,
61 unsigned long, unsigned long);
62 asmlinkage psci_fn __invoke_psci_fn_hvc;
63 asmlinkage psci_fn __invoke_psci_fn_smc;
64 static psci_fn *invoke_psci_fn;
74 static u32 psci_function_id[PSCI_FN_MAX];
76 #define PSCI_0_2_POWER_STATE_MASK \
77 (PSCI_0_2_POWER_STATE_ID_MASK | \
78 PSCI_0_2_POWER_STATE_TYPE_MASK | \
79 PSCI_0_2_POWER_STATE_AFFL_MASK)
81 #define PSCI_1_0_EXT_POWER_STATE_MASK \
82 (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \
83 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
85 static u32 psci_cpu_suspend_feature;
87 static inline bool psci_has_ext_power_state(void)
89 return psci_cpu_suspend_feature &
90 PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
93 bool psci_power_state_loses_context(u32 state)
95 const u32 mask = psci_has_ext_power_state() ?
96 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
97 PSCI_0_2_POWER_STATE_TYPE_MASK;
102 bool psci_power_state_is_valid(u32 state)
104 const u32 valid_mask = psci_has_ext_power_state() ?
105 PSCI_1_0_EXT_POWER_STATE_MASK :
106 PSCI_0_2_POWER_STATE_MASK;
108 return !(state & ~valid_mask);
111 static int psci_to_linux_errno(int errno)
114 case PSCI_RET_SUCCESS:
116 case PSCI_RET_NOT_SUPPORTED:
118 case PSCI_RET_INVALID_PARAMS:
119 case PSCI_RET_INVALID_ADDRESS:
121 case PSCI_RET_DENIED:
128 static u32 psci_get_version(void)
130 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
133 static int psci_cpu_suspend(u32 state, unsigned long entry_point)
138 fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
139 err = invoke_psci_fn(fn, state, entry_point, 0);
140 return psci_to_linux_errno(err);
143 static int psci_cpu_off(u32 state)
148 fn = psci_function_id[PSCI_FN_CPU_OFF];
149 err = invoke_psci_fn(fn, state, 0, 0);
150 return psci_to_linux_errno(err);
153 static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
158 fn = psci_function_id[PSCI_FN_CPU_ON];
159 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
160 return psci_to_linux_errno(err);
163 static int psci_migrate(unsigned long cpuid)
168 fn = psci_function_id[PSCI_FN_MIGRATE];
169 err = invoke_psci_fn(fn, cpuid, 0, 0);
170 return psci_to_linux_errno(err);
173 static int psci_affinity_info(unsigned long target_affinity,
174 unsigned long lowest_affinity_level)
176 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
177 target_affinity, lowest_affinity_level, 0);
180 static int psci_migrate_info_type(void)
182 return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
185 static unsigned long psci_migrate_info_up_cpu(void)
187 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
191 static int get_set_conduit_method(struct device_node *np)
195 pr_info("probing for conduit method from DT.\n");
197 if (of_property_read_string(np, "method", &method)) {
198 pr_warn("missing \"method\" property\n");
202 if (!strcmp("hvc", method)) {
203 invoke_psci_fn = __invoke_psci_fn_hvc;
204 } else if (!strcmp("smc", method)) {
205 invoke_psci_fn = __invoke_psci_fn_smc;
207 pr_warn("invalid \"method\" property: %s\n", method);
213 static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
215 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
218 static void psci_sys_poweroff(void)
220 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
223 static int __init psci_features(u32 psci_func_id)
225 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
229 static int psci_system_suspend(unsigned long unused)
231 return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
232 virt_to_phys(cpu_resume), 0, 0);
235 static int psci_system_suspend_enter(suspend_state_t state)
237 return cpu_suspend(0, psci_system_suspend);
240 static int psci_system_suspend_prepare(void)
242 return regulator_suspend_prepare(PM_SUSPEND_MEM);
245 static void psci_system_suspend_finish(void)
249 ret = regulator_suspend_finish();
251 pr_warn("regulator_suspend_finish failed (%d)\n", ret);
254 static const struct platform_suspend_ops psci_suspend_ops = {
255 .valid = suspend_valid_only_mem,
256 .enter = psci_system_suspend_enter,
257 .prepare = psci_system_suspend_prepare,
258 .finish = psci_system_suspend_finish,
261 static void __init psci_init_system_suspend(void)
265 if (!IS_ENABLED(CONFIG_SUSPEND))
268 ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
270 if (ret != PSCI_RET_NOT_SUPPORTED)
271 suspend_set_ops(&psci_suspend_ops);
274 static void __init psci_init_cpu_suspend(void)
276 int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
278 if (feature != PSCI_RET_NOT_SUPPORTED)
279 psci_cpu_suspend_feature = feature;
283 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
284 * return DENIED (which would be fatal).
286 static void __init psci_init_migrate(void)
291 type = psci_ops.migrate_info_type();
293 if (type == PSCI_0_2_TOS_MP) {
294 pr_info("Trusted OS migration not required\n");
298 if (type == PSCI_RET_NOT_SUPPORTED) {
299 pr_info("MIGRATE_INFO_TYPE not supported.\n");
303 if (type != PSCI_0_2_TOS_UP_MIGRATE &&
304 type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
305 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
309 cpuid = psci_migrate_info_up_cpu();
310 if (cpuid & ~MPIDR_HWID_BITMASK) {
311 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
316 cpu = get_logical_index(cpuid);
317 resident_cpu = cpu >= 0 ? cpu : -1;
319 pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
322 static void __init psci_0_2_set_functions(void)
324 pr_info("Using standard PSCI v0.2 function IDs\n");
325 psci_function_id[PSCI_FN_CPU_SUSPEND] =
326 PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
327 psci_ops.cpu_suspend = psci_cpu_suspend;
329 psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
330 psci_ops.cpu_off = psci_cpu_off;
332 psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON);
333 psci_ops.cpu_on = psci_cpu_on;
335 psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE);
336 psci_ops.migrate = psci_migrate;
338 psci_ops.affinity_info = psci_affinity_info;
340 psci_ops.migrate_info_type = psci_migrate_info_type;
342 arm_pm_restart = psci_sys_reset;
344 pm_power_off = psci_sys_poweroff;
348 * Probe function for PSCI firmware versions >= 0.2
350 static int __init psci_probe(void)
352 u32 ver = psci_get_version();
354 pr_info("PSCIv%d.%d detected in firmware.\n",
355 PSCI_VERSION_MAJOR(ver),
356 PSCI_VERSION_MINOR(ver));
358 if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
359 pr_err("Conflicting PSCI version detected.\n");
363 psci_0_2_set_functions();
367 if (PSCI_VERSION_MAJOR(ver) >= 1) {
368 psci_init_cpu_suspend();
369 psci_init_system_suspend();
375 typedef int (*psci_initcall_t)(const struct device_node *);
378 * PSCI init function for PSCI versions >=0.2
380 * Probe based on PSCI PSCI_VERSION function
382 static int __init psci_0_2_init(struct device_node *np)
386 err = get_set_conduit_method(np);
391 * Starting with v0.2, the PSCI specification introduced a call
392 * (PSCI_VERSION) that allows probing the firmware version, so
393 * that PSCI function IDs and version specific initialization
394 * can be carried out according to the specific version reported
405 * PSCI < v0.2 get PSCI Function IDs via DT.
407 static int __init psci_0_1_init(struct device_node *np)
412 err = get_set_conduit_method(np);
417 pr_info("Using PSCI v0.1 Function IDs from DT\n");
419 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
420 psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
421 psci_ops.cpu_suspend = psci_cpu_suspend;
424 if (!of_property_read_u32(np, "cpu_off", &id)) {
425 psci_function_id[PSCI_FN_CPU_OFF] = id;
426 psci_ops.cpu_off = psci_cpu_off;
429 if (!of_property_read_u32(np, "cpu_on", &id)) {
430 psci_function_id[PSCI_FN_CPU_ON] = id;
431 psci_ops.cpu_on = psci_cpu_on;
434 if (!of_property_read_u32(np, "migrate", &id)) {
435 psci_function_id[PSCI_FN_MIGRATE] = id;
436 psci_ops.migrate = psci_migrate;
444 static const struct of_device_id const psci_of_match[] __initconst = {
445 { .compatible = "arm,psci", .data = psci_0_1_init},
446 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
447 { .compatible = "arm,psci-1.0", .data = psci_0_2_init},
451 int __init psci_dt_init(void)
453 struct device_node *np;
454 const struct of_device_id *matched_np;
455 psci_initcall_t init_fn;
457 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
462 init_fn = (psci_initcall_t)matched_np->data;
468 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
469 * explicitly clarified in SBBR
471 int __init psci_acpi_init(void)
473 if (!acpi_psci_present()) {
474 pr_info("is not implemented in ACPI.\n");
478 pr_info("probing for conduit method from ACPI.\n");
480 if (acpi_psci_use_hvc())
481 invoke_psci_fn = __invoke_psci_fn_hvc;
483 invoke_psci_fn = __invoke_psci_fn_smc;