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
*);
65 PSCI_FN_AFFINITY_INFO
,
66 PSCI_FN_MIGRATE_INFO_TYPE
,
70 static DEFINE_PER_CPU_READ_MOSTLY(struct psci_power_state
*, psci_power_state
);
72 static u32 psci_function_id
[PSCI_FN_MAX
];
74 static int psci_to_linux_errno(int errno
)
77 case PSCI_RET_SUCCESS
:
79 case PSCI_RET_NOT_SUPPORTED
:
81 case PSCI_RET_INVALID_PARAMS
:
90 static u32
psci_power_state_pack(struct psci_power_state state
)
92 return ((state
.id
<< PSCI_0_2_POWER_STATE_ID_SHIFT
)
93 & PSCI_0_2_POWER_STATE_ID_MASK
) |
94 ((state
.type
<< PSCI_0_2_POWER_STATE_TYPE_SHIFT
)
95 & PSCI_0_2_POWER_STATE_TYPE_MASK
) |
96 ((state
.affinity_level
<< PSCI_0_2_POWER_STATE_AFFL_SHIFT
)
97 & PSCI_0_2_POWER_STATE_AFFL_MASK
);
100 static void psci_power_state_unpack(u32 power_state
,
101 struct psci_power_state
*state
)
103 state
->id
= (power_state
& PSCI_0_2_POWER_STATE_ID_MASK
) >>
104 PSCI_0_2_POWER_STATE_ID_SHIFT
;
105 state
->type
= (power_state
& PSCI_0_2_POWER_STATE_TYPE_MASK
) >>
106 PSCI_0_2_POWER_STATE_TYPE_SHIFT
;
107 state
->affinity_level
=
108 (power_state
& PSCI_0_2_POWER_STATE_AFFL_MASK
) >>
109 PSCI_0_2_POWER_STATE_AFFL_SHIFT
;
113 * The following two functions are invoked via the invoke_psci_fn pointer
114 * and will not be inlined, allowing us to piggyback on the AAPCS.
116 static noinline
int __invoke_psci_fn_hvc(u64 function_id
, u64 arg0
, u64 arg1
,
126 : "r" (arg0
), "r" (arg1
), "r" (arg2
));
131 static noinline
int __invoke_psci_fn_smc(u64 function_id
, u64 arg0
, u64 arg1
,
141 : "r" (arg0
), "r" (arg1
), "r" (arg2
));
146 static int psci_get_version(void)
150 err
= invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION
, 0, 0, 0);
154 static int psci_cpu_suspend(struct psci_power_state state
,
155 unsigned long entry_point
)
160 fn
= psci_function_id
[PSCI_FN_CPU_SUSPEND
];
161 power_state
= psci_power_state_pack(state
);
162 err
= invoke_psci_fn(fn
, power_state
, entry_point
, 0);
163 return psci_to_linux_errno(err
);
166 static int psci_cpu_off(struct psci_power_state state
)
171 fn
= psci_function_id
[PSCI_FN_CPU_OFF
];
172 power_state
= psci_power_state_pack(state
);
173 err
= invoke_psci_fn(fn
, power_state
, 0, 0);
174 return psci_to_linux_errno(err
);
177 static int psci_cpu_on(unsigned long cpuid
, unsigned long entry_point
)
182 fn
= psci_function_id
[PSCI_FN_CPU_ON
];
183 err
= invoke_psci_fn(fn
, cpuid
, entry_point
, 0);
184 return psci_to_linux_errno(err
);
187 static int psci_migrate(unsigned long cpuid
)
192 fn
= psci_function_id
[PSCI_FN_MIGRATE
];
193 err
= invoke_psci_fn(fn
, cpuid
, 0, 0);
194 return psci_to_linux_errno(err
);
197 static int psci_affinity_info(unsigned long target_affinity
,
198 unsigned long lowest_affinity_level
)
203 fn
= psci_function_id
[PSCI_FN_AFFINITY_INFO
];
204 err
= invoke_psci_fn(fn
, target_affinity
, lowest_affinity_level
, 0);
208 static int psci_migrate_info_type(void)
213 fn
= psci_function_id
[PSCI_FN_MIGRATE_INFO_TYPE
];
214 err
= invoke_psci_fn(fn
, 0, 0, 0);
218 static int __maybe_unused
cpu_psci_cpu_init_idle(struct device_node
*cpu_node
,
221 int i
, ret
, count
= 0;
222 struct psci_power_state
*psci_states
;
223 struct device_node
*state_node
;
226 * If the PSCI cpu_suspend function hook has not been initialized
227 * idle states must not be enabled, so bail out
229 if (!psci_ops
.cpu_suspend
)
232 /* Count idle states */
233 while ((state_node
= of_parse_phandle(cpu_node
, "cpu-idle-states",
236 of_node_put(state_node
);
242 psci_states
= kcalloc(count
, sizeof(*psci_states
), GFP_KERNEL
);
246 for (i
= 0; i
< count
; i
++) {
247 u32 psci_power_state
;
249 state_node
= of_parse_phandle(cpu_node
, "cpu-idle-states", i
);
251 ret
= of_property_read_u32(state_node
,
252 "arm,psci-suspend-param",
255 pr_warn(" * %s missing arm,psci-suspend-param property\n",
256 state_node
->full_name
);
257 of_node_put(state_node
);
261 of_node_put(state_node
);
262 pr_debug("psci-power-state %#x index %d\n", psci_power_state
,
264 psci_power_state_unpack(psci_power_state
, &psci_states
[i
]);
266 /* Idle states parsed correctly, initialize per-cpu pointer */
267 per_cpu(psci_power_state
, cpu
) = psci_states
;
275 static int get_set_conduit_method(struct device_node
*np
)
279 pr_info("probing for conduit method from DT.\n");
281 if (of_property_read_string(np
, "method", &method
)) {
282 pr_warn("missing \"method\" property\n");
286 if (!strcmp("hvc", method
)) {
287 invoke_psci_fn
= __invoke_psci_fn_hvc
;
288 } else if (!strcmp("smc", method
)) {
289 invoke_psci_fn
= __invoke_psci_fn_smc
;
291 pr_warn("invalid \"method\" property: %s\n", method
);
297 static void psci_sys_reset(enum reboot_mode reboot_mode
, const char *cmd
)
299 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET
, 0, 0, 0);
302 static void psci_sys_poweroff(void)
304 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF
, 0, 0, 0);
308 * PSCI Function IDs for v0.2+ are well defined so use
311 static int __init
psci_0_2_init(struct device_node
*np
)
315 err
= get_set_conduit_method(np
);
320 ver
= psci_get_version();
322 if (ver
== PSCI_RET_NOT_SUPPORTED
) {
323 /* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */
324 pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
328 pr_info("PSCIv%d.%d detected in firmware.\n",
329 PSCI_VERSION_MAJOR(ver
),
330 PSCI_VERSION_MINOR(ver
));
332 if (PSCI_VERSION_MAJOR(ver
) == 0 &&
333 PSCI_VERSION_MINOR(ver
) < 2) {
335 pr_err("Conflicting PSCI version detected.\n");
340 pr_info("Using standard PSCI v0.2 function IDs\n");
341 psci_function_id
[PSCI_FN_CPU_SUSPEND
] = PSCI_0_2_FN64_CPU_SUSPEND
;
342 psci_ops
.cpu_suspend
= psci_cpu_suspend
;
344 psci_function_id
[PSCI_FN_CPU_OFF
] = PSCI_0_2_FN_CPU_OFF
;
345 psci_ops
.cpu_off
= psci_cpu_off
;
347 psci_function_id
[PSCI_FN_CPU_ON
] = PSCI_0_2_FN64_CPU_ON
;
348 psci_ops
.cpu_on
= psci_cpu_on
;
350 psci_function_id
[PSCI_FN_MIGRATE
] = PSCI_0_2_FN64_MIGRATE
;
351 psci_ops
.migrate
= psci_migrate
;
353 psci_function_id
[PSCI_FN_AFFINITY_INFO
] = PSCI_0_2_FN64_AFFINITY_INFO
;
354 psci_ops
.affinity_info
= psci_affinity_info
;
356 psci_function_id
[PSCI_FN_MIGRATE_INFO_TYPE
] =
357 PSCI_0_2_FN_MIGRATE_INFO_TYPE
;
358 psci_ops
.migrate_info_type
= psci_migrate_info_type
;
360 arm_pm_restart
= psci_sys_reset
;
362 pm_power_off
= psci_sys_poweroff
;
370 * PSCI < v0.2 get PSCI Function IDs via DT.
372 static int __init
psci_0_1_init(struct device_node
*np
)
377 err
= get_set_conduit_method(np
);
382 pr_info("Using PSCI v0.1 Function IDs from DT\n");
384 if (!of_property_read_u32(np
, "cpu_suspend", &id
)) {
385 psci_function_id
[PSCI_FN_CPU_SUSPEND
] = id
;
386 psci_ops
.cpu_suspend
= psci_cpu_suspend
;
389 if (!of_property_read_u32(np
, "cpu_off", &id
)) {
390 psci_function_id
[PSCI_FN_CPU_OFF
] = id
;
391 psci_ops
.cpu_off
= psci_cpu_off
;
394 if (!of_property_read_u32(np
, "cpu_on", &id
)) {
395 psci_function_id
[PSCI_FN_CPU_ON
] = id
;
396 psci_ops
.cpu_on
= psci_cpu_on
;
399 if (!of_property_read_u32(np
, "migrate", &id
)) {
400 psci_function_id
[PSCI_FN_MIGRATE
] = id
;
401 psci_ops
.migrate
= psci_migrate
;
409 static const struct of_device_id psci_of_match
[] __initconst
= {
410 { .compatible
= "arm,psci", .data
= psci_0_1_init
},
411 { .compatible
= "arm,psci-0.2", .data
= psci_0_2_init
},
415 int __init
psci_init(void)
417 struct device_node
*np
;
418 const struct of_device_id
*matched_np
;
419 psci_initcall_t init_fn
;
421 np
= of_find_matching_node_and_match(NULL
, psci_of_match
, &matched_np
);
426 init_fn
= (psci_initcall_t
)matched_np
->data
;
432 static int __init
cpu_psci_cpu_init(struct device_node
*dn
, unsigned int cpu
)
437 static int __init
cpu_psci_cpu_prepare(unsigned int cpu
)
439 if (!psci_ops
.cpu_on
) {
440 pr_err("no cpu_on method, not booting CPU%d\n", cpu
);
447 static int cpu_psci_cpu_boot(unsigned int cpu
)
449 int err
= psci_ops
.cpu_on(cpu_logical_map(cpu
), __pa(secondary_entry
));
451 pr_err("failed to boot CPU%d (%d)\n", cpu
, err
);
456 #ifdef CONFIG_HOTPLUG_CPU
457 static int cpu_psci_cpu_disable(unsigned int cpu
)
459 /* Fail early if we don't have CPU_OFF support */
460 if (!psci_ops
.cpu_off
)
465 static void cpu_psci_cpu_die(unsigned int cpu
)
469 * There are no known implementations of PSCI actually using the
470 * power state field, pass a sensible default for now.
472 struct psci_power_state state
= {
473 .type
= PSCI_POWER_STATE_TYPE_POWER_DOWN
,
476 ret
= psci_ops
.cpu_off(state
);
478 pr_crit("unable to power off CPU%u (%d)\n", cpu
, ret
);
481 static int cpu_psci_cpu_kill(unsigned int cpu
)
485 if (!psci_ops
.affinity_info
)
488 * cpu_kill could race with cpu_die and we can
489 * potentially end up declaring this cpu undead
490 * while it is dying. So, try again a few times.
493 for (i
= 0; i
< 10; i
++) {
494 err
= psci_ops
.affinity_info(cpu_logical_map(cpu
), 0);
495 if (err
== PSCI_0_2_AFFINITY_LEVEL_OFF
) {
496 pr_info("CPU%d killed.\n", cpu
);
501 pr_info("Retrying again to check for CPU kill\n");
504 pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
506 /* Make op_cpu_kill() fail. */
512 static int psci_suspend_finisher(unsigned long index
)
514 struct psci_power_state
*state
= __get_cpu_var(psci_power_state
);
516 return psci_ops
.cpu_suspend(state
[index
- 1],
517 virt_to_phys(cpu_resume
));
520 static int __maybe_unused
cpu_psci_cpu_suspend(unsigned long index
)
523 struct psci_power_state
*state
= __get_cpu_var(psci_power_state
);
525 * idle state index 0 corresponds to wfi, should never be called
526 * from the cpu_suspend operations
528 if (WARN_ON_ONCE(!index
))
531 if (state
[index
- 1].type
== PSCI_POWER_STATE_TYPE_STANDBY
)
532 ret
= psci_ops
.cpu_suspend(state
[index
- 1], 0);
534 ret
= __cpu_suspend(index
, psci_suspend_finisher
);
539 const struct cpu_operations cpu_psci_ops
= {
541 #ifdef CONFIG_CPU_IDLE
542 .cpu_init_idle
= cpu_psci_cpu_init_idle
,
543 .cpu_suspend
= cpu_psci_cpu_suspend
,
546 .cpu_init
= cpu_psci_cpu_init
,
547 .cpu_prepare
= cpu_psci_cpu_prepare
,
548 .cpu_boot
= cpu_psci_cpu_boot
,
549 #ifdef CONFIG_HOTPLUG_CPU
550 .cpu_disable
= cpu_psci_cpu_disable
,
551 .cpu_die
= cpu_psci_cpu_die
,
552 .cpu_kill
= cpu_psci_cpu_kill
,