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>
24 #include <uapi/linux/psci.h>
26 #include <asm/cputype.h>
27 #include <asm/system_misc.h>
28 #include <asm/smp_plat.h>
31 * While a 64-bit OS can make calls with SMC32 calling conventions, for some
32 * calls it is necessary to use SMC64 to pass or return 64-bit values. For such
33 * calls PSCI_0_2_FN_NATIVE(x) will choose the appropriate (native-width)
37 #define PSCI_0_2_FN_NATIVE(name) PSCI_0_2_FN64_##name
39 #define PSCI_0_2_FN_NATIVE(name) PSCI_0_2_FN_##name
43 * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
44 * calls to its resident CPU, so we must avoid issuing those. We never migrate
45 * a Trusted OS even if it claims to be capable of migration -- doing so will
46 * require cooperation with a Trusted OS driver.
48 static int resident_cpu = -1;
50 bool psci_tos_resident_on(int cpu)
52 return cpu == resident_cpu;
55 struct psci_operations psci_ops;
57 typedef unsigned long (psci_fn)(unsigned long, unsigned long,
58 unsigned long, unsigned long);
59 asmlinkage psci_fn __invoke_psci_fn_hvc;
60 asmlinkage psci_fn __invoke_psci_fn_smc;
61 static psci_fn *invoke_psci_fn;
71 static u32 psci_function_id[PSCI_FN_MAX];
73 #define PSCI_0_2_POWER_STATE_MASK \
74 (PSCI_0_2_POWER_STATE_ID_MASK | \
75 PSCI_0_2_POWER_STATE_TYPE_MASK | \
76 PSCI_0_2_POWER_STATE_AFFL_MASK)
78 bool psci_power_state_loses_context(u32 state)
80 return state & PSCI_0_2_POWER_STATE_TYPE_MASK;
83 bool psci_power_state_is_valid(u32 state)
85 return !(state & ~PSCI_0_2_POWER_STATE_MASK);
88 static int psci_to_linux_errno(int errno)
91 case PSCI_RET_SUCCESS:
93 case PSCI_RET_NOT_SUPPORTED:
95 case PSCI_RET_INVALID_PARAMS:
96 case PSCI_RET_INVALID_ADDRESS:
105 static u32 psci_get_version(void)
107 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
110 static int psci_cpu_suspend(u32 state, unsigned long entry_point)
115 fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
116 err = invoke_psci_fn(fn, state, entry_point, 0);
117 return psci_to_linux_errno(err);
120 static int psci_cpu_off(u32 state)
125 fn = psci_function_id[PSCI_FN_CPU_OFF];
126 err = invoke_psci_fn(fn, state, 0, 0);
127 return psci_to_linux_errno(err);
130 static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
135 fn = psci_function_id[PSCI_FN_CPU_ON];
136 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
137 return psci_to_linux_errno(err);
140 static int psci_migrate(unsigned long cpuid)
145 fn = psci_function_id[PSCI_FN_MIGRATE];
146 err = invoke_psci_fn(fn, cpuid, 0, 0);
147 return psci_to_linux_errno(err);
150 static int psci_affinity_info(unsigned long target_affinity,
151 unsigned long lowest_affinity_level)
153 return invoke_psci_fn(PSCI_0_2_FN_NATIVE(AFFINITY_INFO),
154 target_affinity, lowest_affinity_level, 0);
157 static int psci_migrate_info_type(void)
159 return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
162 static unsigned long psci_migrate_info_up_cpu(void)
164 return invoke_psci_fn(PSCI_0_2_FN_NATIVE(MIGRATE_INFO_UP_CPU),
168 static int get_set_conduit_method(struct device_node *np)
172 pr_info("probing for conduit method from DT.\n");
174 if (of_property_read_string(np, "method", &method)) {
175 pr_warn("missing \"method\" property\n");
179 if (!strcmp("hvc", method)) {
180 invoke_psci_fn = __invoke_psci_fn_hvc;
181 } else if (!strcmp("smc", method)) {
182 invoke_psci_fn = __invoke_psci_fn_smc;
184 pr_warn("invalid \"method\" property: %s\n", method);
190 static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
192 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
195 static void psci_sys_poweroff(void)
197 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
201 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
202 * return DENIED (which would be fatal).
204 static void __init psci_init_migrate(void)
209 type = psci_ops.migrate_info_type();
211 if (type == PSCI_0_2_TOS_MP) {
212 pr_info("Trusted OS migration not required\n");
216 if (type == PSCI_RET_NOT_SUPPORTED) {
217 pr_info("MIGRATE_INFO_TYPE not supported.\n");
221 if (type != PSCI_0_2_TOS_UP_MIGRATE &&
222 type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
223 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
227 cpuid = psci_migrate_info_up_cpu();
228 if (cpuid & ~MPIDR_HWID_BITMASK) {
229 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
234 cpu = get_logical_index(cpuid);
235 resident_cpu = cpu >= 0 ? cpu : -1;
237 pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
240 static void __init psci_0_2_set_functions(void)
242 pr_info("Using standard PSCI v0.2 function IDs\n");
243 psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_NATIVE(CPU_SUSPEND);
244 psci_ops.cpu_suspend = psci_cpu_suspend;
246 psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
247 psci_ops.cpu_off = psci_cpu_off;
249 psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN_NATIVE(CPU_ON);
250 psci_ops.cpu_on = psci_cpu_on;
252 psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_NATIVE(MIGRATE);
253 psci_ops.migrate = psci_migrate;
255 psci_ops.affinity_info = psci_affinity_info;
257 psci_ops.migrate_info_type = psci_migrate_info_type;
259 arm_pm_restart = psci_sys_reset;
261 pm_power_off = psci_sys_poweroff;
265 * Probe function for PSCI firmware versions >= 0.2
267 static int __init psci_probe(void)
269 u32 ver = psci_get_version();
271 pr_info("PSCIv%d.%d detected in firmware.\n",
272 PSCI_VERSION_MAJOR(ver),
273 PSCI_VERSION_MINOR(ver));
275 if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
276 pr_err("Conflicting PSCI version detected.\n");
280 psci_0_2_set_functions();
287 typedef int (*psci_initcall_t)(const struct device_node *);
290 * PSCI init function for PSCI versions >=0.2
292 * Probe based on PSCI PSCI_VERSION function
294 static int __init psci_0_2_init(struct device_node *np)
298 err = get_set_conduit_method(np);
303 * Starting with v0.2, the PSCI specification introduced a call
304 * (PSCI_VERSION) that allows probing the firmware version, so
305 * that PSCI function IDs and version specific initialization
306 * can be carried out according to the specific version reported
317 * PSCI < v0.2 get PSCI Function IDs via DT.
319 static int __init psci_0_1_init(struct device_node *np)
324 err = get_set_conduit_method(np);
329 pr_info("Using PSCI v0.1 Function IDs from DT\n");
331 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
332 psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
333 psci_ops.cpu_suspend = psci_cpu_suspend;
336 if (!of_property_read_u32(np, "cpu_off", &id)) {
337 psci_function_id[PSCI_FN_CPU_OFF] = id;
338 psci_ops.cpu_off = psci_cpu_off;
341 if (!of_property_read_u32(np, "cpu_on", &id)) {
342 psci_function_id[PSCI_FN_CPU_ON] = id;
343 psci_ops.cpu_on = psci_cpu_on;
346 if (!of_property_read_u32(np, "migrate", &id)) {
347 psci_function_id[PSCI_FN_MIGRATE] = id;
348 psci_ops.migrate = psci_migrate;
356 static const struct of_device_id const psci_of_match[] __initconst = {
357 { .compatible = "arm,psci", .data = psci_0_1_init},
358 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
362 int __init psci_dt_init(void)
364 struct device_node *np;
365 const struct of_device_id *matched_np;
366 psci_initcall_t init_fn;
368 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
373 init_fn = (psci_initcall_t)matched_np->data;
379 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
380 * explicitly clarified in SBBR
382 int __init psci_acpi_init(void)
384 if (!acpi_psci_present()) {
385 pr_info("is not implemented in ACPI.\n");
389 pr_info("probing for conduit method from ACPI.\n");
391 if (acpi_psci_use_hvc())
392 invoke_psci_fn = __invoke_psci_fn_hvc;
394 invoke_psci_fn = __invoke_psci_fn_smc;