[deliverable/linux.git] / drivers / firmware / psci.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Copyright (C) 2015 ARM Limited
 */

#define pr_fmt(fmt) "psci: " fmt

#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/printk.h>
#include <linux/psci.h>
#include <linux/reboot.h>

#include <uapi/linux/psci.h>

#include <asm/cputype.h>
#include <asm/system_misc.h>
#include <asm/smp_plat.h>

/*
 * While a 64-bit OS can make calls with SMC32 calling conventions, for some
 * calls it is necessary to use SMC64 to pass or return 64-bit values. For such
 * calls PSCI_0_2_FN_NATIVE(x) will choose the appropriate (native-width)
 * function ID.
 */
#ifdef CONFIG_64BIT
#define PSCI_0_2_FN_NATIVE(name)	PSCI_0_2_FN64_##name
#else
#define PSCI_0_2_FN_NATIVE(name)	PSCI_0_2_FN_##name
#endif

/*
 * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
 * calls to its resident CPU, so we must avoid issuing those. We never migrate
 * a Trusted OS even if it claims to be capable of migration -- doing so will
 * require cooperation with a Trusted OS driver.
 */
static int resident_cpu = -1;

bool psci_tos_resident_on(int cpu)
{
	return cpu == resident_cpu;
}

struct psci_operations psci_ops;

typedef unsigned long (psci_fn)(unsigned long, unsigned long,
				unsigned long, unsigned long);
asmlinkage psci_fn __invoke_psci_fn_hvc;
asmlinkage psci_fn __invoke_psci_fn_smc;
static psci_fn *invoke_psci_fn;

enum psci_function {
	PSCI_FN_CPU_SUSPEND,
	PSCI_FN_CPU_ON,
	PSCI_FN_CPU_OFF,
	PSCI_FN_MIGRATE,
	PSCI_FN_MAX,
};

static u32 psci_function_id[PSCI_FN_MAX];

#define PSCI_0_2_POWER_STATE_MASK		\
				(PSCI_0_2_POWER_STATE_ID_MASK | \
				PSCI_0_2_POWER_STATE_TYPE_MASK | \
				PSCI_0_2_POWER_STATE_AFFL_MASK)

#define PSCI_1_0_EXT_POWER_STATE_MASK		\
				(PSCI_1_0_EXT_POWER_STATE_ID_MASK | \
				PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)

static u32 psci_cpu_suspend_feature;

static inline bool psci_has_ext_power_state(void)
{
	return psci_cpu_suspend_feature &
				PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
}

bool psci_power_state_loses_context(u32 state)
{
	const u32 mask = psci_has_ext_power_state() ?
					PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
					PSCI_0_2_POWER_STATE_TYPE_MASK;

	return state & mask;
}

bool psci_power_state_is_valid(u32 state)
{
	const u32 valid_mask = psci_has_ext_power_state() ?
			       PSCI_1_0_EXT_POWER_STATE_MASK :
			       PSCI_0_2_POWER_STATE_MASK;

	return !(state & ~valid_mask);
}

static int psci_to_linux_errno(int errno)
{
	switch (errno) {
	case PSCI_RET_SUCCESS:
		return 0;
	case PSCI_RET_NOT_SUPPORTED:
		return -EOPNOTSUPP;
	case PSCI_RET_INVALID_PARAMS:
	case PSCI_RET_INVALID_ADDRESS:
		return -EINVAL;
	case PSCI_RET_DENIED:
		return -EPERM;
	};

	return -EINVAL;
}

static u32 psci_get_version(void)
{
	return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
}

static int psci_cpu_suspend(u32 state, unsigned long entry_point)
{
	int err;
	u32 fn;

	fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
	err = invoke_psci_fn(fn, state, entry_point, 0);
	return psci_to_linux_errno(err);
}

static int psci_cpu_off(u32 state)
{
	int err;
	u32 fn;

	fn = psci_function_id[PSCI_FN_CPU_OFF];
	err = invoke_psci_fn(fn, state, 0, 0);
	return psci_to_linux_errno(err);
}

static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
{
	int err;
	u32 fn;

	fn = psci_function_id[PSCI_FN_CPU_ON];
	err = invoke_psci_fn(fn, cpuid, entry_point, 0);
	return psci_to_linux_errno(err);
}

static int psci_migrate(unsigned long cpuid)
{
	int err;
	u32 fn;

	fn = psci_function_id[PSCI_FN_MIGRATE];
	err = invoke_psci_fn(fn, cpuid, 0, 0);
	return psci_to_linux_errno(err);
}

static int psci_affinity_info(unsigned long target_affinity,
		unsigned long lowest_affinity_level)
{
	return invoke_psci_fn(PSCI_0_2_FN_NATIVE(AFFINITY_INFO),
			      target_affinity, lowest_affinity_level, 0);
}

static int psci_migrate_info_type(void)
{
	return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
}

static unsigned long psci_migrate_info_up_cpu(void)
{
	return invoke_psci_fn(PSCI_0_2_FN_NATIVE(MIGRATE_INFO_UP_CPU),
			      0, 0, 0);
}

static int get_set_conduit_method(struct device_node *np)
{
	const char *method;

	pr_info("probing for conduit method from DT.\n");

	if (of_property_read_string(np, "method", &method)) {
		pr_warn("missing \"method\" property\n");
		return -ENXIO;
	}

	if (!strcmp("hvc", method)) {
		invoke_psci_fn = __invoke_psci_fn_hvc;
	} else if (!strcmp("smc", method)) {
		invoke_psci_fn = __invoke_psci_fn_smc;
	} else {
		pr_warn("invalid \"method\" property: %s\n", method);
		return -EINVAL;
	}
	return 0;
}

static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
{
	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
}

static void psci_sys_poweroff(void)
{
	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
}

static int __init psci_features(u32 psci_func_id)
{
	return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
			      psci_func_id, 0, 0);
}

static void __init psci_init_cpu_suspend(void)
{
	int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);

	if (feature != PSCI_RET_NOT_SUPPORTED)
		psci_cpu_suspend_feature = feature;
}

/*
 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
 * return DENIED (which would be fatal).
 */
static void __init psci_init_migrate(void)
{
	unsigned long cpuid;
	int type, cpu = -1;

	type = psci_ops.migrate_info_type();

	if (type == PSCI_0_2_TOS_MP) {
		pr_info("Trusted OS migration not required\n");
		return;
	}

	if (type == PSCI_RET_NOT_SUPPORTED) {
		pr_info("MIGRATE_INFO_TYPE not supported.\n");
		return;
	}

	if (type != PSCI_0_2_TOS_UP_MIGRATE &&
	    type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
		pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
		return;
	}

	cpuid = psci_migrate_info_up_cpu();
	if (cpuid & ~MPIDR_HWID_BITMASK) {
		pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
			cpuid);
		return;
	}

	cpu = get_logical_index(cpuid);
	resident_cpu = cpu >= 0 ? cpu : -1;

	pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
}

static void __init psci_0_2_set_functions(void)
{
	pr_info("Using standard PSCI v0.2 function IDs\n");
	psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_NATIVE(CPU_SUSPEND);
	psci_ops.cpu_suspend = psci_cpu_suspend;

	psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
	psci_ops.cpu_off = psci_cpu_off;

	psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN_NATIVE(CPU_ON);
	psci_ops.cpu_on = psci_cpu_on;

	psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_NATIVE(MIGRATE);
	psci_ops.migrate = psci_migrate;

	psci_ops.affinity_info = psci_affinity_info;

	psci_ops.migrate_info_type = psci_migrate_info_type;

	arm_pm_restart = psci_sys_reset;

	pm_power_off = psci_sys_poweroff;
}

/*
 * Probe function for PSCI firmware versions >= 0.2
 */
static int __init psci_probe(void)
{
	u32 ver = psci_get_version();

	pr_info("PSCIv%d.%d detected in firmware.\n",
			PSCI_VERSION_MAJOR(ver),
			PSCI_VERSION_MINOR(ver));

	if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
		pr_err("Conflicting PSCI version detected.\n");
		return -EINVAL;
	}

	psci_0_2_set_functions();

	psci_init_migrate();

	psci_init_cpu_suspend();

	return 0;
}

typedef int (*psci_initcall_t)(const struct device_node *);

/*
 * PSCI init function for PSCI versions >=0.2
 *
 * Probe based on PSCI PSCI_VERSION function
 */
static int __init psci_0_2_init(struct device_node *np)
{
	int err;

	err = get_set_conduit_method(np);

	if (err)
		goto out_put_node;
	/*
	 * Starting with v0.2, the PSCI specification introduced a call
	 * (PSCI_VERSION) that allows probing the firmware version, so
	 * that PSCI function IDs and version specific initialization
	 * can be carried out according to the specific version reported
	 * by firmware
	 */
	err = psci_probe();

out_put_node:
	of_node_put(np);
	return err;
}

/*
 * PSCI < v0.2 get PSCI Function IDs via DT.
 */
static int __init psci_0_1_init(struct device_node *np)
{
	u32 id;
	int err;

	err = get_set_conduit_method(np);

	if (err)
		goto out_put_node;

	pr_info("Using PSCI v0.1 Function IDs from DT\n");

	if (!of_property_read_u32(np, "cpu_suspend", &id)) {
		psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
		psci_ops.cpu_suspend = psci_cpu_suspend;
	}

	if (!of_property_read_u32(np, "cpu_off", &id)) {
		psci_function_id[PSCI_FN_CPU_OFF] = id;
		psci_ops.cpu_off = psci_cpu_off;
	}

	if (!of_property_read_u32(np, "cpu_on", &id)) {
		psci_function_id[PSCI_FN_CPU_ON] = id;
		psci_ops.cpu_on = psci_cpu_on;
	}

	if (!of_property_read_u32(np, "migrate", &id)) {
		psci_function_id[PSCI_FN_MIGRATE] = id;
		psci_ops.migrate = psci_migrate;
	}

out_put_node:
	of_node_put(np);
	return err;
}

static const struct of_device_id const psci_of_match[] __initconst = {
	{ .compatible = "arm,psci",	.data = psci_0_1_init},
	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
	{ .compatible = "arm,psci-1.0",	.data = psci_0_2_init},
	{},
};

int __init psci_dt_init(void)
{
	struct device_node *np;
	const struct of_device_id *matched_np;
	psci_initcall_t init_fn;

	np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);

	if (!np)
		return -ENODEV;

	init_fn = (psci_initcall_t)matched_np->data;
	return init_fn(np);
}

#ifdef CONFIG_ACPI
/*
 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
 * explicitly clarified in SBBR
 */
int __init psci_acpi_init(void)
{
	if (!acpi_psci_present()) {
		pr_info("is not implemented in ACPI.\n");
		return -EOPNOTSUPP;
	}

	pr_info("probing for conduit method from ACPI.\n");

	if (acpi_psci_use_hvc())
		invoke_psci_fn = __invoke_psci_fn_hvc;
	else
		invoke_psci_fn = __invoke_psci_fn_smc;

	return psci_probe();
}
#endif
Commit	Line	Data
bff60792 MR	1	/*
	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.
	5	*
	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.
	10	*
	11	* Copyright (C) 2015 ARM Limited
	12	*/
	13
	14	#define pr_fmt(fmt) "psci: " fmt
	15
	16	#include <linux/errno.h>
	17	#include <linux/linkage.h>
	18	#include <linux/of.h>
	19	#include <linux/pm.h>
	20	#include <linux/printk.h>
	21	#include <linux/psci.h>
	22	#include <linux/reboot.h>
	23
	24	#include <uapi/linux/psci.h>
	25
	26	#include <asm/cputype.h>
	27	#include <asm/system_misc.h>
	28	#include <asm/smp_plat.h>
	29
5211df00 MR	30	/*
	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)
	34	* function ID.
	35	*/
	36	#ifdef CONFIG_64BIT
	37	#define PSCI_0_2_FN_NATIVE(name) PSCI_0_2_FN64_##name
	38	#else
	39	#define PSCI_0_2_FN_NATIVE(name) PSCI_0_2_FN_##name
	40	#endif
	41
bff60792 MR	42	/*
	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.
	47	*/
	48	static int resident_cpu = -1;
	49
	50	bool psci_tos_resident_on(int cpu)
	51	{
	52	return cpu == resident_cpu;
	53	}
	54
	55	struct psci_operations psci_ops;
	56
	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;
	62
	63	enum psci_function {
	64	PSCI_FN_CPU_SUSPEND,
	65	PSCI_FN_CPU_ON,
	66	PSCI_FN_CPU_OFF,
	67	PSCI_FN_MIGRATE,
	68	PSCI_FN_MAX,
	69	};
	70
	71	static u32 psci_function_id[PSCI_FN_MAX];
	72
068654c2 LP	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)
	77
a5c00bb2 LP	78	#define PSCI_1_0_EXT_POWER_STATE_MASK \
	79	(PSCI_1_0_EXT_POWER_STATE_ID_MASK \| \
	80	PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
	81
	82	static u32 psci_cpu_suspend_feature;
	83
	84	static inline bool psci_has_ext_power_state(void)
	85	{
	86	return psci_cpu_suspend_feature &
	87	PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
	88	}
	89
068654c2 LP	90	bool psci_power_state_loses_context(u32 state)
068654c2 LP	91	{
a5c00bb2 LP	92	const u32 mask = psci_has_ext_power_state() ?
	93	PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
	94	PSCI_0_2_POWER_STATE_TYPE_MASK;
	95
	96	return state & mask;
068654c2 LP	97	}
	98
	99	bool psci_power_state_is_valid(u32 state)
	100	{
a5c00bb2 LP	101	const u32 valid_mask = psci_has_ext_power_state() ?
	102	PSCI_1_0_EXT_POWER_STATE_MASK :
	103	PSCI_0_2_POWER_STATE_MASK;
	104
	105	return !(state & ~valid_mask);
068654c2 LP	106	}
068654c2 LP	107
bff60792 MR	108	static int psci_to_linux_errno(int errno)
	109	{
	110	switch (errno) {
	111	case PSCI_RET_SUCCESS:
	112	return 0;
	113	case PSCI_RET_NOT_SUPPORTED:
	114	return -EOPNOTSUPP;
	115	case PSCI_RET_INVALID_PARAMS:
2217d7c6	116	case PSCI_RET_INVALID_ADDRESS:
bff60792 MR	117	return -EINVAL;
	118	case PSCI_RET_DENIED:
	119	return -EPERM;
	120	};
	121
	122	return -EINVAL;
	123	}
	124
	125	static u32 psci_get_version(void)
	126	{
	127	return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
	128	}
	129
	130	static int psci_cpu_suspend(u32 state, unsigned long entry_point)
	131	{
	132	int err;
	133	u32 fn;
	134
	135	fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
	136	err = invoke_psci_fn(fn, state, entry_point, 0);
	137	return psci_to_linux_errno(err);
	138	}
	139
	140	static int psci_cpu_off(u32 state)
	141	{
	142	int err;
	143	u32 fn;
	144
	145	fn = psci_function_id[PSCI_FN_CPU_OFF];
	146	err = invoke_psci_fn(fn, state, 0, 0);
	147	return psci_to_linux_errno(err);
	148	}
	149
	150	static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
	151	{
	152	int err;
	153	u32 fn;
	154
	155	fn = psci_function_id[PSCI_FN_CPU_ON];
	156	err = invoke_psci_fn(fn, cpuid, entry_point, 0);
	157	return psci_to_linux_errno(err);
	158	}
	159
	160	static int psci_migrate(unsigned long cpuid)
	161	{
	162	int err;
	163	u32 fn;
	164
	165	fn = psci_function_id[PSCI_FN_MIGRATE];
	166	err = invoke_psci_fn(fn, cpuid, 0, 0);
	167	return psci_to_linux_errno(err);
	168	}
	169
	170	static int psci_affinity_info(unsigned long target_affinity,
	171	unsigned long lowest_affinity_level)
	172	{
5211df00 MR	173	return invoke_psci_fn(PSCI_0_2_FN_NATIVE(AFFINITY_INFO),
5211df00 MR	174	target_affinity, lowest_affinity_level, 0);
bff60792 MR	175	}
	176
	177	static int psci_migrate_info_type(void)
	178	{
	179	return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
	180	}
	181
	182	static unsigned long psci_migrate_info_up_cpu(void)
	183	{
5211df00 MR	184	return invoke_psci_fn(PSCI_0_2_FN_NATIVE(MIGRATE_INFO_UP_CPU),
5211df00 MR	185	0, 0, 0);
bff60792 MR	186	}
	187
	188	static int get_set_conduit_method(struct device_node *np)
	189	{
	190	const char *method;
	191
	192	pr_info("probing for conduit method from DT.\n");
	193
	194	if (of_property_read_string(np, "method", &method)) {
	195	pr_warn("missing \"method\" property\n");
	196	return -ENXIO;
	197	}
	198
	199	if (!strcmp("hvc", method)) {
	200	invoke_psci_fn = __invoke_psci_fn_hvc;
	201	} else if (!strcmp("smc", method)) {
	202	invoke_psci_fn = __invoke_psci_fn_smc;
	203	} else {
	204	pr_warn("invalid \"method\" property: %s\n", method);
	205	return -EINVAL;
	206	}
	207	return 0;
	208	}
	209
	210	static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
	211	{
	212	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
	213	}
	214
	215	static void psci_sys_poweroff(void)
	216	{
	217	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
	218	}
	219
5f004e0c LP	220	static int __init psci_features(u32 psci_func_id)
	221	{
	222	return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
	223	psci_func_id, 0, 0);
	224	}
	225
a5c00bb2 LP	226	static void __init psci_init_cpu_suspend(void)
	227	{
	228	int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
	229
	230	if (feature != PSCI_RET_NOT_SUPPORTED)
	231	psci_cpu_suspend_feature = feature;
	232	}
	233
bff60792 MR	234	/*
	235	* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
	236	* return DENIED (which would be fatal).
	237	*/
	238	static void __init psci_init_migrate(void)
	239	{
	240	unsigned long cpuid;
	241	int type, cpu = -1;
	242
	243	type = psci_ops.migrate_info_type();
	244
	245	if (type == PSCI_0_2_TOS_MP) {
	246	pr_info("Trusted OS migration not required\n");
	247	return;
	248	}
	249
	250	if (type == PSCI_RET_NOT_SUPPORTED) {
	251	pr_info("MIGRATE_INFO_TYPE not supported.\n");
	252	return;
	253	}
	254
	255	if (type != PSCI_0_2_TOS_UP_MIGRATE &&
	256	type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
	257	pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
	258	return;
	259	}
	260
	261	cpuid = psci_migrate_info_up_cpu();
	262	if (cpuid & ~MPIDR_HWID_BITMASK) {
	263	pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
	264	cpuid);
	265	return;
	266	}
	267
	268	cpu = get_logical_index(cpuid);
	269	resident_cpu = cpu >= 0 ? cpu : -1;
	270
	271	pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
	272	}
	273
	274	static void __init psci_0_2_set_functions(void)
	275	{
	276	pr_info("Using standard PSCI v0.2 function IDs\n");
5211df00	277	psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_NATIVE(CPU_SUSPEND);
bff60792 MR	278	psci_ops.cpu_suspend = psci_cpu_suspend;
	279
	280	psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
	281	psci_ops.cpu_off = psci_cpu_off;
	282
5211df00	283	psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN_NATIVE(CPU_ON);
bff60792 MR	284	psci_ops.cpu_on = psci_cpu_on;
bff60792 MR	285
5211df00	286	psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_NATIVE(MIGRATE);
bff60792 MR	287	psci_ops.migrate = psci_migrate;
	288
	289	psci_ops.affinity_info = psci_affinity_info;
	290
	291	psci_ops.migrate_info_type = psci_migrate_info_type;
	292
	293	arm_pm_restart = psci_sys_reset;
	294
	295	pm_power_off = psci_sys_poweroff;
	296	}
	297
	298	/*
	299	* Probe function for PSCI firmware versions >= 0.2
	300	*/
	301	static int __init psci_probe(void)
	302	{
	303	u32 ver = psci_get_version();
	304
	305	pr_info("PSCIv%d.%d detected in firmware.\n",
	306	PSCI_VERSION_MAJOR(ver),
	307	PSCI_VERSION_MINOR(ver));
	308
	309	if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
	310	pr_err("Conflicting PSCI version detected.\n");
	311	return -EINVAL;
	312	}
	313
	314	psci_0_2_set_functions();
	315
	316	psci_init_migrate();
	317
a5c00bb2 LP	318	psci_init_cpu_suspend();
a5c00bb2 LP	319
bff60792 MR	320	return 0;
	321	}
	322
	323	typedef int (psci_initcall_t)(const struct device_node );
	324
	325	/*
	326	* PSCI init function for PSCI versions >=0.2
	327	*
	328	* Probe based on PSCI PSCI_VERSION function
	329	*/
	330	static int __init psci_0_2_init(struct device_node *np)
	331	{
	332	int err;
	333
	334	err = get_set_conduit_method(np);
	335
	336	if (err)
	337	goto out_put_node;
	338	/*
	339	* Starting with v0.2, the PSCI specification introduced a call
	340	* (PSCI_VERSION) that allows probing the firmware version, so
	341	* that PSCI function IDs and version specific initialization
	342	* can be carried out according to the specific version reported
	343	* by firmware
	344	*/
	345	err = psci_probe();
	346
	347	out_put_node:
	348	of_node_put(np);
	349	return err;
	350	}
	351
	352	/*
	353	* PSCI < v0.2 get PSCI Function IDs via DT.
	354	*/
	355	static int __init psci_0_1_init(struct device_node *np)
	356	{
	357	u32 id;
	358	int err;
	359
	360	err = get_set_conduit_method(np);
	361
	362	if (err)
	363	goto out_put_node;
	364
	365	pr_info("Using PSCI v0.1 Function IDs from DT\n");
	366
	367	if (!of_property_read_u32(np, "cpu_suspend", &id)) {
	368	psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
	369	psci_ops.cpu_suspend = psci_cpu_suspend;
	370	}
	371
	372	if (!of_property_read_u32(np, "cpu_off", &id)) {
	373	psci_function_id[PSCI_FN_CPU_OFF] = id;
	374	psci_ops.cpu_off = psci_cpu_off;
	375	}
	376
	377	if (!of_property_read_u32(np, "cpu_on", &id)) {
	378	psci_function_id[PSCI_FN_CPU_ON] = id;
	379	psci_ops.cpu_on = psci_cpu_on;
	380	}
	381
	382	if (!of_property_read_u32(np, "migrate", &id)) {
	383	psci_function_id[PSCI_FN_MIGRATE] = id;
384	psci_ops.migrate = psci_migrate;
385	}
386
387	out_put_node:
388	of_node_put(np);
389	return err;
390	}
391
c706c7eb	392	static const struct of_device_id const psci_of_match[] __initconst = {
bff60792 MR	393	{ .compatible = "arm,psci", .data = psci_0_1_init},
bff60792 MR	394	{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
0fc197c7	395	{ .compatible = "arm,psci-1.0", .data = psci_0_2_init},
bff60792 MR	396	{},
	397	};
	398
	399	int __init psci_dt_init(void)
	400	{
	401	struct device_node *np;
	402	const struct of_device_id *matched_np;
	403	psci_initcall_t init_fn;
	404
	405	np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
	406
	407	if (!np)
	408	return -ENODEV;
	409
	410	init_fn = (psci_initcall_t)matched_np->data;
	411	return init_fn(np);
	412	}
	413
	414	#ifdef CONFIG_ACPI
	415	/*
	416	* We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
	417	* explicitly clarified in SBBR
	418	*/
	419	int __init psci_acpi_init(void)
	420	{
	421	if (!acpi_psci_present()) {
	422	pr_info("is not implemented in ACPI.\n");
	423	return -EOPNOTSUPP;
	424	}
	425
	426	pr_info("probing for conduit method from ACPI.\n");
	427
	428	if (acpi_psci_use_hvc())
	429	invoke_psci_fn = __invoke_psci_fn_hvc;
	430	else
	431	invoke_psci_fn = __invoke_psci_fn_smc;
	432
	433	return psci_probe();
	434	}
	435	#endif