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/init.h>
20 #include <linux/smp.h>
21 #include <linux/reboot.h>
23 #include <linux/delay.h>
24 #include <linux/slab.h>
25 #include <uapi/linux/psci.h>
27 #include <asm/compiler.h>
28 #include <asm/cpu_ops.h>
29 #include <asm/errno.h>
31 #include <asm/smp_plat.h>
32 #include <asm/suspend.h>
33 #include <asm/system_misc.h>
35 #define PSCI_POWER_STATE_TYPE_STANDBY 0
36 #define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
38 struct psci_power_state
{
44 struct psci_operations
{
45 int (*cpu_suspend
)(struct psci_power_state state
,
46 unsigned long entry_point
);
47 int (*cpu_off
)(struct psci_power_state state
);
48 int (*cpu_on
)(unsigned long cpuid
, unsigned long entry_point
);
49 int (*migrate
)(unsigned long cpuid
);
50 int (*affinity_info
)(unsigned long target_affinity
,
51 unsigned long lowest_affinity_level
);
52 int (*migrate_info_type
)(void);
55 static struct psci_operations psci_ops
;
57 static int (*invoke_psci_fn
)(u64
, u64
, u64
, u64
);
58 typedef int (*psci_initcall_t
)(const struct device_node
*);
60 asmlinkage
int __invoke_psci_fn_hvc(u64
, u64
, u64
, u64
);
61 asmlinkage
int __invoke_psci_fn_smc(u64
, u64
, u64
, u64
);
68 PSCI_FN_AFFINITY_INFO
,
69 PSCI_FN_MIGRATE_INFO_TYPE
,
73 static DEFINE_PER_CPU_READ_MOSTLY(struct psci_power_state
*, psci_power_state
);
75 static u32 psci_function_id
[PSCI_FN_MAX
];
77 static int psci_to_linux_errno(int errno
)
80 case PSCI_RET_SUCCESS
:
82 case PSCI_RET_NOT_SUPPORTED
:
84 case PSCI_RET_INVALID_PARAMS
:
93 static u32
psci_power_state_pack(struct psci_power_state state
)
95 return ((state
.id
<< PSCI_0_2_POWER_STATE_ID_SHIFT
)
96 & PSCI_0_2_POWER_STATE_ID_MASK
) |
97 ((state
.type
<< PSCI_0_2_POWER_STATE_TYPE_SHIFT
)
98 & PSCI_0_2_POWER_STATE_TYPE_MASK
) |
99 ((state
.affinity_level
<< PSCI_0_2_POWER_STATE_AFFL_SHIFT
)
100 & PSCI_0_2_POWER_STATE_AFFL_MASK
);
103 static void psci_power_state_unpack(u32 power_state
,
104 struct psci_power_state
*state
)
106 state
->id
= (power_state
& PSCI_0_2_POWER_STATE_ID_MASK
) >>
107 PSCI_0_2_POWER_STATE_ID_SHIFT
;
108 state
->type
= (power_state
& PSCI_0_2_POWER_STATE_TYPE_MASK
) >>
109 PSCI_0_2_POWER_STATE_TYPE_SHIFT
;
110 state
->affinity_level
=
111 (power_state
& PSCI_0_2_POWER_STATE_AFFL_MASK
) >>
112 PSCI_0_2_POWER_STATE_AFFL_SHIFT
;
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 __maybe_unused
cpu_psci_cpu_init_idle(struct device_node
*cpu_node
,
190 int i
, ret
, count
= 0;
191 struct psci_power_state
*psci_states
;
192 struct device_node
*state_node
;
195 * If the PSCI cpu_suspend function hook has not been initialized
196 * idle states must not be enabled, so bail out
198 if (!psci_ops
.cpu_suspend
)
201 /* Count idle states */
202 while ((state_node
= of_parse_phandle(cpu_node
, "cpu-idle-states",
205 of_node_put(state_node
);
211 psci_states
= kcalloc(count
, sizeof(*psci_states
), GFP_KERNEL
);
215 for (i
= 0; i
< count
; i
++) {
216 u32 psci_power_state
;
218 state_node
= of_parse_phandle(cpu_node
, "cpu-idle-states", i
);
220 ret
= of_property_read_u32(state_node
,
221 "arm,psci-suspend-param",
224 pr_warn(" * %s missing arm,psci-suspend-param property\n",
225 state_node
->full_name
);
226 of_node_put(state_node
);
230 of_node_put(state_node
);
231 pr_debug("psci-power-state %#x index %d\n", psci_power_state
,
233 psci_power_state_unpack(psci_power_state
, &psci_states
[i
]);
235 /* Idle states parsed correctly, initialize per-cpu pointer */
236 per_cpu(psci_power_state
, cpu
) = psci_states
;
244 static int get_set_conduit_method(struct device_node
*np
)
248 pr_info("probing for conduit method from DT.\n");
250 if (of_property_read_string(np
, "method", &method
)) {
251 pr_warn("missing \"method\" property\n");
255 if (!strcmp("hvc", method
)) {
256 invoke_psci_fn
= __invoke_psci_fn_hvc
;
257 } else if (!strcmp("smc", method
)) {
258 invoke_psci_fn
= __invoke_psci_fn_smc
;
260 pr_warn("invalid \"method\" property: %s\n", method
);
266 static void psci_sys_reset(enum reboot_mode reboot_mode
, const char *cmd
)
268 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET
, 0, 0, 0);
271 static void psci_sys_poweroff(void)
273 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF
, 0, 0, 0);
277 * PSCI Function IDs for v0.2+ are well defined so use
280 static int __init
psci_0_2_init(struct device_node
*np
)
284 err
= get_set_conduit_method(np
);
289 ver
= psci_get_version();
291 if (ver
== PSCI_RET_NOT_SUPPORTED
) {
292 /* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */
293 pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
297 pr_info("PSCIv%d.%d detected in firmware.\n",
298 PSCI_VERSION_MAJOR(ver
),
299 PSCI_VERSION_MINOR(ver
));
301 if (PSCI_VERSION_MAJOR(ver
) == 0 &&
302 PSCI_VERSION_MINOR(ver
) < 2) {
304 pr_err("Conflicting PSCI version detected.\n");
309 pr_info("Using standard PSCI v0.2 function IDs\n");
310 psci_function_id
[PSCI_FN_CPU_SUSPEND
] = PSCI_0_2_FN64_CPU_SUSPEND
;
311 psci_ops
.cpu_suspend
= psci_cpu_suspend
;
313 psci_function_id
[PSCI_FN_CPU_OFF
] = PSCI_0_2_FN_CPU_OFF
;
314 psci_ops
.cpu_off
= psci_cpu_off
;
316 psci_function_id
[PSCI_FN_CPU_ON
] = PSCI_0_2_FN64_CPU_ON
;
317 psci_ops
.cpu_on
= psci_cpu_on
;
319 psci_function_id
[PSCI_FN_MIGRATE
] = PSCI_0_2_FN64_MIGRATE
;
320 psci_ops
.migrate
= psci_migrate
;
322 psci_function_id
[PSCI_FN_AFFINITY_INFO
] = PSCI_0_2_FN64_AFFINITY_INFO
;
323 psci_ops
.affinity_info
= psci_affinity_info
;
325 psci_function_id
[PSCI_FN_MIGRATE_INFO_TYPE
] =
326 PSCI_0_2_FN_MIGRATE_INFO_TYPE
;
327 psci_ops
.migrate_info_type
= psci_migrate_info_type
;
329 arm_pm_restart
= psci_sys_reset
;
331 pm_power_off
= psci_sys_poweroff
;
339 * PSCI < v0.2 get PSCI Function IDs via DT.
341 static int __init
psci_0_1_init(struct device_node
*np
)
346 err
= get_set_conduit_method(np
);
351 pr_info("Using PSCI v0.1 Function IDs from DT\n");
353 if (!of_property_read_u32(np
, "cpu_suspend", &id
)) {
354 psci_function_id
[PSCI_FN_CPU_SUSPEND
] = id
;
355 psci_ops
.cpu_suspend
= psci_cpu_suspend
;
358 if (!of_property_read_u32(np
, "cpu_off", &id
)) {
359 psci_function_id
[PSCI_FN_CPU_OFF
] = id
;
360 psci_ops
.cpu_off
= psci_cpu_off
;
363 if (!of_property_read_u32(np
, "cpu_on", &id
)) {
364 psci_function_id
[PSCI_FN_CPU_ON
] = id
;
365 psci_ops
.cpu_on
= psci_cpu_on
;
368 if (!of_property_read_u32(np
, "migrate", &id
)) {
369 psci_function_id
[PSCI_FN_MIGRATE
] = id
;
370 psci_ops
.migrate
= psci_migrate
;
378 static const struct of_device_id psci_of_match
[] __initconst
= {
379 { .compatible
= "arm,psci", .data
= psci_0_1_init
},
380 { .compatible
= "arm,psci-0.2", .data
= psci_0_2_init
},
384 int __init
psci_init(void)
386 struct device_node
*np
;
387 const struct of_device_id
*matched_np
;
388 psci_initcall_t init_fn
;
390 np
= of_find_matching_node_and_match(NULL
, psci_of_match
, &matched_np
);
395 init_fn
= (psci_initcall_t
)matched_np
->data
;
401 static int __init
cpu_psci_cpu_init(struct device_node
*dn
, unsigned int cpu
)
406 static int __init
cpu_psci_cpu_prepare(unsigned int cpu
)
408 if (!psci_ops
.cpu_on
) {
409 pr_err("no cpu_on method, not booting CPU%d\n", cpu
);
416 static int cpu_psci_cpu_boot(unsigned int cpu
)
418 int err
= psci_ops
.cpu_on(cpu_logical_map(cpu
), __pa(secondary_entry
));
420 pr_err("failed to boot CPU%d (%d)\n", cpu
, err
);
425 #ifdef CONFIG_HOTPLUG_CPU
426 static int cpu_psci_cpu_disable(unsigned int cpu
)
428 /* Fail early if we don't have CPU_OFF support */
429 if (!psci_ops
.cpu_off
)
434 static void cpu_psci_cpu_die(unsigned int cpu
)
438 * There are no known implementations of PSCI actually using the
439 * power state field, pass a sensible default for now.
441 struct psci_power_state state
= {
442 .type
= PSCI_POWER_STATE_TYPE_POWER_DOWN
,
445 ret
= psci_ops
.cpu_off(state
);
447 pr_crit("unable to power off CPU%u (%d)\n", cpu
, ret
);
450 static int cpu_psci_cpu_kill(unsigned int cpu
)
454 if (!psci_ops
.affinity_info
)
457 * cpu_kill could race with cpu_die and we can
458 * potentially end up declaring this cpu undead
459 * while it is dying. So, try again a few times.
462 for (i
= 0; i
< 10; i
++) {
463 err
= psci_ops
.affinity_info(cpu_logical_map(cpu
), 0);
464 if (err
== PSCI_0_2_AFFINITY_LEVEL_OFF
) {
465 pr_info("CPU%d killed.\n", cpu
);
470 pr_info("Retrying again to check for CPU kill\n");
473 pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
475 /* Make op_cpu_kill() fail. */
481 static int psci_suspend_finisher(unsigned long index
)
483 struct psci_power_state
*state
= __this_cpu_read(psci_power_state
);
485 return psci_ops
.cpu_suspend(state
[index
- 1],
486 virt_to_phys(cpu_resume
));
489 static int __maybe_unused
cpu_psci_cpu_suspend(unsigned long index
)
492 struct psci_power_state
*state
= __this_cpu_read(psci_power_state
);
494 * idle state index 0 corresponds to wfi, should never be called
495 * from the cpu_suspend operations
497 if (WARN_ON_ONCE(!index
))
500 if (state
[index
- 1].type
== PSCI_POWER_STATE_TYPE_STANDBY
)
501 ret
= psci_ops
.cpu_suspend(state
[index
- 1], 0);
503 ret
= __cpu_suspend(index
, psci_suspend_finisher
);
508 const struct cpu_operations cpu_psci_ops
= {
510 #ifdef CONFIG_CPU_IDLE
511 .cpu_init_idle
= cpu_psci_cpu_init_idle
,
512 .cpu_suspend
= cpu_psci_cpu_suspend
,
515 .cpu_init
= cpu_psci_cpu_init
,
516 .cpu_prepare
= cpu_psci_cpu_prepare
,
517 .cpu_boot
= cpu_psci_cpu_boot
,
518 #ifdef CONFIG_HOTPLUG_CPU
519 .cpu_disable
= cpu_psci_cpu_disable
,
520 .cpu_die
= cpu_psci_cpu_die
,
521 .cpu_kill
= cpu_psci_cpu_kill
,