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/*
* 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) 2012 ARM Limited
*
* Author: Will Deacon <will.deacon@arm.com>
*/
#define pr_fmt(fmt) "psci: " fmt
#include <linux/init.h>
#include <linux/of.h>
#include <linux/reboot.h>
#include <linux/pm.h>
#include <uapi/linux/psci.h>
#include <asm/compiler.h>
#include <asm/errno.h>
#include <asm/psci.h>
#include <asm/system_misc.h>
struct psci_operations psci_ops;
static int (*invoke_psci_fn)(u32, u32, u32, u32);
typedef int (*psci_initcall_t)(const struct device_node *);
asmlinkage int __invoke_psci_fn_hvc(u32, u32, u32, u32);
asmlinkage int __invoke_psci_fn_smc(u32, u32, u32, u32);
enum psci_function {
PSCI_FN_CPU_SUSPEND,
PSCI_FN_CPU_ON,
PSCI_FN_CPU_OFF,
PSCI_FN_MIGRATE,
PSCI_FN_AFFINITY_INFO,
PSCI_FN_MIGRATE_INFO_TYPE,
PSCI_FN_MAX,
};
static u32 psci_function_id[PSCI_FN_MAX];
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:
return -EINVAL;
case PSCI_RET_DENIED:
return -EPERM;
};
return -EINVAL;
}
static u32 psci_power_state_pack(struct psci_power_state state)
{
return ((state.id << PSCI_0_2_POWER_STATE_ID_SHIFT)
& PSCI_0_2_POWER_STATE_ID_MASK) |
((state.type << PSCI_0_2_POWER_STATE_TYPE_SHIFT)
& PSCI_0_2_POWER_STATE_TYPE_MASK) |
((state.affinity_level << PSCI_0_2_POWER_STATE_AFFL_SHIFT)
& PSCI_0_2_POWER_STATE_AFFL_MASK);
}
static int psci_get_version(void)
{
int err;
err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
return err;
}
static int psci_cpu_suspend(struct psci_power_state state,
unsigned long entry_point)
{
int err;
u32 fn, power_state;
fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
power_state = psci_power_state_pack(state);
err = invoke_psci_fn(fn, power_state, entry_point, 0);
return psci_to_linux_errno(err);
}
static int psci_cpu_off(struct psci_power_state state)
{
int err;
u32 fn, power_state;
fn = psci_function_id[PSCI_FN_CPU_OFF];
power_state = psci_power_state_pack(state);
err = invoke_psci_fn(fn, power_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)
{
int err;
u32 fn;
fn = psci_function_id[PSCI_FN_AFFINITY_INFO];
err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0);
return err;
}
static int psci_migrate_info_type(void)
{
int err;
u32 fn;
fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
err = invoke_psci_fn(fn, 0, 0, 0);
return err;
}
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);
}
/*
* PSCI Function IDs for v0.2+ are well defined so use
* standard values.
*/
static int psci_0_2_init(struct device_node *np)
{
int err, ver;
err = get_set_conduit_method(np);
if (err)
goto out_put_node;
ver = psci_get_version();
if (ver == PSCI_RET_NOT_SUPPORTED) {
/* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */
pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
err = -EOPNOTSUPP;
goto out_put_node;
} else {
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) {
err = -EINVAL;
pr_err("Conflicting PSCI version detected.\n");
goto out_put_node;
}
}
pr_info("Using standard PSCI v0.2 function IDs\n");
psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_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_CPU_ON;
psci_ops.cpu_on = psci_cpu_on;
psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_MIGRATE;
psci_ops.migrate = psci_migrate;
psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN_AFFINITY_INFO;
psci_ops.affinity_info = psci_affinity_info;
psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] =
PSCI_0_2_FN_MIGRATE_INFO_TYPE;
psci_ops.migrate_info_type = psci_migrate_info_type;
arm_pm_restart = psci_sys_reset;
pm_power_off = psci_sys_poweroff;
out_put_node:
of_node_put(np);
return err;
}
/*
* PSCI < v0.2 get PSCI Function IDs via DT.
*/
static int 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 psci_of_match[] __initconst = {
{ .compatible = "arm,psci", .data = psci_0_1_init},
{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
{},
};
int __init psci_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);
}
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