[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 <linux/suspend.h>

#include <uapi/linux/psci.h>

#include <asm/cputype.h>
#include <asm/system_misc.h>
#include <asm/smp_plat.h>
#include <asm/suspend.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_FN_NATIVE(version, name) will choose the appropriate
 * (native-width) function ID.
 */
#ifdef CONFIG_64BIT
#define PSCI_FN_NATIVE(version, name)	PSCI_##version##_FN64_##name
#else
#define PSCI_FN_NATIVE(version, name)	PSCI_##version##_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_FN_NATIVE(0_2, 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_FN_NATIVE(0_2, 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 int psci_system_suspend(unsigned long unused)
{
	return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
			      virt_to_phys(cpu_resume), 0, 0);
}

static int psci_system_suspend_enter(suspend_state_t state)
{
	return cpu_suspend(0, psci_system_suspend);
}

static const struct platform_suspend_ops psci_suspend_ops = {
	.valid          = suspend_valid_only_mem,
	.enter          = psci_system_suspend_enter,
};

static void __init psci_init_system_suspend(void)
{
	int ret;

	if (!IS_ENABLED(CONFIG_SUSPEND))
		return;

	ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));

	if (ret != PSCI_RET_NOT_SUPPORTED)
		suspend_set_ops(&psci_suspend_ops);
}

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_FN_NATIVE(0_2, 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_FN_NATIVE(0_2, CPU_ON);
	psci_ops.cpu_on = psci_cpu_on;

	psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, 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();

	if (PSCI_VERSION_MAJOR(ver) >= 1) {
		psci_init_cpu_suspend();
		psci_init_system_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>
faf7ec4a	23	#include <linux/suspend.h>
bff60792 MR	24
	25	#include <uapi/linux/psci.h>
	26
	27	#include <asm/cputype.h>
	28	#include <asm/system_misc.h>
	29	#include <asm/smp_plat.h>
faf7ec4a	30	#include <asm/suspend.h>
bff60792	31
5211df00 MR	32	/*
5211df00 MR	33	* While a 64-bit OS can make calls with SMC32 calling conventions, for some
029180b1 SH	34	* calls it is necessary to use SMC64 to pass or return 64-bit values.
	35	* For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
	36	* (native-width) function ID.
5211df00 MR	37	*/
5211df00 MR	38	#ifdef CONFIG_64BIT
029180b1	39	#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
5211df00	40	#else
029180b1	41	#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
5211df00 MR	42	#endif
5211df00 MR	43
bff60792 MR	44	/*
	45	* The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
	46	* calls to its resident CPU, so we must avoid issuing those. We never migrate
	47	* a Trusted OS even if it claims to be capable of migration -- doing so will
	48	* require cooperation with a Trusted OS driver.
	49	*/
	50	static int resident_cpu = -1;
	51
	52	bool psci_tos_resident_on(int cpu)
	53	{
	54	return cpu == resident_cpu;
	55	}
	56
	57	struct psci_operations psci_ops;
	58
	59	typedef unsigned long (psci_fn)(unsigned long, unsigned long,
	60	unsigned long, unsigned long);
	61	asmlinkage psci_fn __invoke_psci_fn_hvc;
	62	asmlinkage psci_fn __invoke_psci_fn_smc;
	63	static psci_fn *invoke_psci_fn;
	64
	65	enum psci_function {
	66	PSCI_FN_CPU_SUSPEND,
	67	PSCI_FN_CPU_ON,
	68	PSCI_FN_CPU_OFF,
	69	PSCI_FN_MIGRATE,
	70	PSCI_FN_MAX,
	71	};
	72
	73	static u32 psci_function_id[PSCI_FN_MAX];
	74
068654c2 LP	75	#define PSCI_0_2_POWER_STATE_MASK \
	76	(PSCI_0_2_POWER_STATE_ID_MASK \| \
	77	PSCI_0_2_POWER_STATE_TYPE_MASK \| \
	78	PSCI_0_2_POWER_STATE_AFFL_MASK)
	79
a5c00bb2 LP	80	#define PSCI_1_0_EXT_POWER_STATE_MASK \
	81	(PSCI_1_0_EXT_POWER_STATE_ID_MASK \| \
	82	PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
	83
	84	static u32 psci_cpu_suspend_feature;
	85
	86	static inline bool psci_has_ext_power_state(void)
	87	{
	88	return psci_cpu_suspend_feature &
	89	PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
	90	}
	91
068654c2 LP	92	bool psci_power_state_loses_context(u32 state)
068654c2 LP	93	{
a5c00bb2 LP	94	const u32 mask = psci_has_ext_power_state() ?
	95	PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
	96	PSCI_0_2_POWER_STATE_TYPE_MASK;
	97
	98	return state & mask;
068654c2 LP	99	}
	100
	101	bool psci_power_state_is_valid(u32 state)
	102	{
a5c00bb2 LP	103	const u32 valid_mask = psci_has_ext_power_state() ?
	104	PSCI_1_0_EXT_POWER_STATE_MASK :
	105	PSCI_0_2_POWER_STATE_MASK;
	106
	107	return !(state & ~valid_mask);
068654c2 LP	108	}
068654c2 LP	109
bff60792 MR	110	static int psci_to_linux_errno(int errno)
	111	{
	112	switch (errno) {
	113	case PSCI_RET_SUCCESS:
	114	return 0;
	115	case PSCI_RET_NOT_SUPPORTED:
	116	return -EOPNOTSUPP;
	117	case PSCI_RET_INVALID_PARAMS:
2217d7c6	118	case PSCI_RET_INVALID_ADDRESS:
bff60792 MR	119	return -EINVAL;
	120	case PSCI_RET_DENIED:
	121	return -EPERM;
	122	};
	123
	124	return -EINVAL;
	125	}
	126
	127	static u32 psci_get_version(void)
	128	{
	129	return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
	130	}
	131
	132	static int psci_cpu_suspend(u32 state, unsigned long entry_point)
	133	{
	134	int err;
	135	u32 fn;
	136
	137	fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
	138	err = invoke_psci_fn(fn, state, entry_point, 0);
	139	return psci_to_linux_errno(err);
	140	}
	141
	142	static int psci_cpu_off(u32 state)
	143	{
	144	int err;
	145	u32 fn;
	146
	147	fn = psci_function_id[PSCI_FN_CPU_OFF];
	148	err = invoke_psci_fn(fn, state, 0, 0);
	149	return psci_to_linux_errno(err);
	150	}
	151
	152	static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
	153	{
	154	int err;
	155	u32 fn;
	156
	157	fn = psci_function_id[PSCI_FN_CPU_ON];
	158	err = invoke_psci_fn(fn, cpuid, entry_point, 0);
	159	return psci_to_linux_errno(err);
	160	}
	161
	162	static int psci_migrate(unsigned long cpuid)
	163	{
	164	int err;
	165	u32 fn;
	166
	167	fn = psci_function_id[PSCI_FN_MIGRATE];
	168	err = invoke_psci_fn(fn, cpuid, 0, 0);
	169	return psci_to_linux_errno(err);
	170	}
	171
	172	static int psci_affinity_info(unsigned long target_affinity,
	173	unsigned long lowest_affinity_level)
	174	{
029180b1	175	return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
5211df00	176	target_affinity, lowest_affinity_level, 0);
bff60792 MR	177	}
	178
	179	static int psci_migrate_info_type(void)
	180	{
	181	return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
	182	}
	183
	184	static unsigned long psci_migrate_info_up_cpu(void)
	185	{
029180b1	186	return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
5211df00	187	0, 0, 0);
bff60792 MR	188	}
	189
	190	static int get_set_conduit_method(struct device_node *np)
	191	{
	192	const char *method;
	193
	194	pr_info("probing for conduit method from DT.\n");
	195
	196	if (of_property_read_string(np, "method", &method)) {
	197	pr_warn("missing \"method\" property\n");
	198	return -ENXIO;
	199	}
	200
	201	if (!strcmp("hvc", method)) {
	202	invoke_psci_fn = __invoke_psci_fn_hvc;
	203	} else if (!strcmp("smc", method)) {
	204	invoke_psci_fn = __invoke_psci_fn_smc;
	205	} else {
	206	pr_warn("invalid \"method\" property: %s\n", method);
	207	return -EINVAL;
	208	}
	209	return 0;
	210	}
	211
	212	static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
	213	{
	214	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
	215	}
	216
	217	static void psci_sys_poweroff(void)
	218	{
	219	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
	220	}
	221
5f004e0c LP	222	static int __init psci_features(u32 psci_func_id)
	223	{
	224	return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
	225	psci_func_id, 0, 0);
	226	}
	227
faf7ec4a SH	228	static int psci_system_suspend(unsigned long unused)
	229	{
	230	return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
	231	virt_to_phys(cpu_resume), 0, 0);
	232	}
	233
	234	static int psci_system_suspend_enter(suspend_state_t state)
	235	{
	236	return cpu_suspend(0, psci_system_suspend);
	237	}
	238
	239	static const struct platform_suspend_ops psci_suspend_ops = {
	240	.valid = suspend_valid_only_mem,
	241	.enter = psci_system_suspend_enter,
	242	};
	243
	244	static void __init psci_init_system_suspend(void)
	245	{
	246	int ret;
	247
	248	if (!IS_ENABLED(CONFIG_SUSPEND))
	249	return;
	250
	251	ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
	252
	253	if (ret != PSCI_RET_NOT_SUPPORTED)
	254	suspend_set_ops(&psci_suspend_ops);
	255	}
	256
a5c00bb2 LP	257	static void __init psci_init_cpu_suspend(void)
	258	{
	259	int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
	260
	261	if (feature != PSCI_RET_NOT_SUPPORTED)
	262	psci_cpu_suspend_feature = feature;
	263	}
	264
bff60792 MR	265	/*
	266	* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
	267	* return DENIED (which would be fatal).
	268	*/
	269	static void __init psci_init_migrate(void)
	270	{
	271	unsigned long cpuid;
	272	int type, cpu = -1;
	273
	274	type = psci_ops.migrate_info_type();
	275
	276	if (type == PSCI_0_2_TOS_MP) {
	277	pr_info("Trusted OS migration not required\n");
	278	return;
	279	}
	280
	281	if (type == PSCI_RET_NOT_SUPPORTED) {
	282	pr_info("MIGRATE_INFO_TYPE not supported.\n");
	283	return;
	284	}
	285
	286	if (type != PSCI_0_2_TOS_UP_MIGRATE &&
	287	type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
	288	pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
	289	return;
	290	}
	291
	292	cpuid = psci_migrate_info_up_cpu();
	293	if (cpuid & ~MPIDR_HWID_BITMASK) {
	294	pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
	295	cpuid);
	296	return;
	297	}
	298
	299	cpu = get_logical_index(cpuid);
	300	resident_cpu = cpu >= 0 ? cpu : -1;
	301
	302	pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
	303	}
	304
	305	static void __init psci_0_2_set_functions(void)
	306	{
	307	pr_info("Using standard PSCI v0.2 function IDs\n");
029180b1 SH	308	psci_function_id[PSCI_FN_CPU_SUSPEND] =
029180b1 SH	309	PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
bff60792 MR	310	psci_ops.cpu_suspend = psci_cpu_suspend;
	311
	312	psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
	313	psci_ops.cpu_off = psci_cpu_off;
	314
029180b1	315	psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON);
bff60792 MR	316	psci_ops.cpu_on = psci_cpu_on;
bff60792 MR	317
029180b1	318	psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE);
bff60792 MR	319	psci_ops.migrate = psci_migrate;
	320
	321	psci_ops.affinity_info = psci_affinity_info;
	322
	323	psci_ops.migrate_info_type = psci_migrate_info_type;
	324
	325	arm_pm_restart = psci_sys_reset;
	326
	327	pm_power_off = psci_sys_poweroff;
	328	}
	329
	330	/*
	331	* Probe function for PSCI firmware versions >= 0.2
	332	*/
	333	static int __init psci_probe(void)
	334	{
	335	u32 ver = psci_get_version();
	336
	337	pr_info("PSCIv%d.%d detected in firmware.\n",
	338	PSCI_VERSION_MAJOR(ver),
	339	PSCI_VERSION_MINOR(ver));
	340
	341	if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
	342	pr_err("Conflicting PSCI version detected.\n");
	343	return -EINVAL;
	344	}
	345
	346	psci_0_2_set_functions();
	347
	348	psci_init_migrate();
	349
79b04beb LP	350	if (PSCI_VERSION_MAJOR(ver) >= 1) {
	351	psci_init_cpu_suspend();
	352	psci_init_system_suspend();
	353	}
faf7ec4a	354
bff60792 MR	355	return 0;
	356	}
	357
	358	typedef int (psci_initcall_t)(const struct device_node );
	359
	360	/*
	361	* PSCI init function for PSCI versions >=0.2
	362	*
	363	* Probe based on PSCI PSCI_VERSION function
	364	*/
	365	static int __init psci_0_2_init(struct device_node *np)
	366	{
	367	int err;
	368
	369	err = get_set_conduit_method(np);
	370
	371	if (err)
	372	goto out_put_node;
	373	/*
	374	* Starting with v0.2, the PSCI specification introduced a call
	375	* (PSCI_VERSION) that allows probing the firmware version, so
	376	* that PSCI function IDs and version specific initialization
	377	* can be carried out according to the specific version reported
	378	* by firmware
	379	*/
	380	err = psci_probe();
	381
	382	out_put_node:
	383	of_node_put(np);
	384	return err;
	385	}
	386
	387	/*
	388	* PSCI < v0.2 get PSCI Function IDs via DT.
	389	*/
	390	static int __init psci_0_1_init(struct device_node *np)
	391	{
	392	u32 id;
	393	int err;
	394
	395	err = get_set_conduit_method(np);
	396
	397	if (err)
	398	goto out_put_node;
	399
	400	pr_info("Using PSCI v0.1 Function IDs from DT\n");
	401
	402	if (!of_property_read_u32(np, "cpu_suspend", &id)) {
	403	psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
	404	psci_ops.cpu_suspend = psci_cpu_suspend;
	405	}
	406
	407	if (!of_property_read_u32(np, "cpu_off", &id)) {
	408	psci_function_id[PSCI_FN_CPU_OFF] = id;
	409	psci_ops.cpu_off = psci_cpu_off;
	410	}
	411
	412	if (!of_property_read_u32(np, "cpu_on", &id)) {
	413	psci_function_id[PSCI_FN_CPU_ON] = id;
	414	psci_ops.cpu_on = psci_cpu_on;
	415	}
	416
	417	if (!of_property_read_u32(np, "migrate", &id)) {
	418	psci_function_id[PSCI_FN_MIGRATE] = id;
419	psci_ops.migrate = psci_migrate;
420	}
421
422	out_put_node:
423	of_node_put(np);
424	return err;
425	}
426
c706c7eb	427	static const struct of_device_id const psci_of_match[] __initconst = {
bff60792 MR	428	{ .compatible = "arm,psci", .data = psci_0_1_init},
bff60792 MR	429	{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
0fc197c7	430	{ .compatible = "arm,psci-1.0", .data = psci_0_2_init},
bff60792 MR	431	{},
	432	};
	433
	434	int __init psci_dt_init(void)
	435	{
	436	struct device_node *np;
	437	const struct of_device_id *matched_np;
	438	psci_initcall_t init_fn;
	439
	440	np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
	441
	442	if (!np)
	443	return -ENODEV;
	444
	445	init_fn = (psci_initcall_t)matched_np->data;
	446	return init_fn(np);
	447	}
	448
	449	#ifdef CONFIG_ACPI
	450	/*
	451	* We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
	452	* explicitly clarified in SBBR
	453	*/
	454	int __init psci_acpi_init(void)
	455	{
	456	if (!acpi_psci_present()) {
	457	pr_info("is not implemented in ACPI.\n");
	458	return -EOPNOTSUPP;
	459	}
	460
	461	pr_info("probing for conduit method from ACPI.\n");
	462
	463	if (acpi_psci_use_hvc())
	464	invoke_psci_fn = __invoke_psci_fn_hvc;
	465	else
	466	invoke_psci_fn = __invoke_psci_fn_smc;
	467
	468	return psci_probe();
	469	}
	470	#endif