294 lines
6.5 KiB
C
294 lines
6.5 KiB
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) 2013 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/smp.h>
|
|
|
|
#include <asm/compiler.h>
|
|
#include <asm/cpu_ops.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/psci.h>
|
|
#include <asm/smp_plat.h>
|
|
|
|
#define PSCI_POWER_STATE_TYPE_STANDBY 0
|
|
#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
|
|
|
|
struct psci_power_state {
|
|
u16 id;
|
|
u8 type;
|
|
u8 affinity_level;
|
|
};
|
|
|
|
struct psci_operations {
|
|
int (*cpu_suspend)(struct psci_power_state state,
|
|
unsigned long entry_point);
|
|
int (*cpu_off)(struct psci_power_state state);
|
|
int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
|
|
int (*migrate)(unsigned long cpuid);
|
|
};
|
|
|
|
static struct psci_operations psci_ops;
|
|
|
|
static int (*invoke_psci_fn)(u64, u64, u64, u64);
|
|
|
|
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_RET_SUCCESS 0
|
|
#define PSCI_RET_EOPNOTSUPP -1
|
|
#define PSCI_RET_EINVAL -2
|
|
#define PSCI_RET_EPERM -3
|
|
|
|
static int psci_to_linux_errno(int errno)
|
|
{
|
|
switch (errno) {
|
|
case PSCI_RET_SUCCESS:
|
|
return 0;
|
|
case PSCI_RET_EOPNOTSUPP:
|
|
return -EOPNOTSUPP;
|
|
case PSCI_RET_EINVAL:
|
|
return -EINVAL;
|
|
case PSCI_RET_EPERM:
|
|
return -EPERM;
|
|
};
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
#define PSCI_POWER_STATE_ID_MASK 0xffff
|
|
#define PSCI_POWER_STATE_ID_SHIFT 0
|
|
#define PSCI_POWER_STATE_TYPE_MASK 0x1
|
|
#define PSCI_POWER_STATE_TYPE_SHIFT 16
|
|
#define PSCI_POWER_STATE_AFFL_MASK 0x3
|
|
#define PSCI_POWER_STATE_AFFL_SHIFT 24
|
|
|
|
static u32 psci_power_state_pack(struct psci_power_state state)
|
|
{
|
|
return ((state.id & PSCI_POWER_STATE_ID_MASK)
|
|
<< PSCI_POWER_STATE_ID_SHIFT) |
|
|
((state.type & PSCI_POWER_STATE_TYPE_MASK)
|
|
<< PSCI_POWER_STATE_TYPE_SHIFT) |
|
|
((state.affinity_level & PSCI_POWER_STATE_AFFL_MASK)
|
|
<< PSCI_POWER_STATE_AFFL_SHIFT);
|
|
}
|
|
|
|
/*
|
|
* The following two functions are invoked via the invoke_psci_fn pointer
|
|
* and will not be inlined, allowing us to piggyback on the AAPCS.
|
|
*/
|
|
static noinline int __invoke_psci_fn_hvc(u64 function_id, u64 arg0, u64 arg1,
|
|
u64 arg2)
|
|
{
|
|
asm volatile(
|
|
__asmeq("%0", "x0")
|
|
__asmeq("%1", "x1")
|
|
__asmeq("%2", "x2")
|
|
__asmeq("%3", "x3")
|
|
"hvc #0\n"
|
|
: "+r" (function_id)
|
|
: "r" (arg0), "r" (arg1), "r" (arg2));
|
|
|
|
return function_id;
|
|
}
|
|
|
|
static noinline int __invoke_psci_fn_smc(u64 function_id, u64 arg0, u64 arg1,
|
|
u64 arg2)
|
|
{
|
|
asm volatile(
|
|
__asmeq("%0", "x0")
|
|
__asmeq("%1", "x1")
|
|
__asmeq("%2", "x2")
|
|
__asmeq("%3", "x3")
|
|
"smc #0\n"
|
|
: "+r" (function_id)
|
|
: "r" (arg0), "r" (arg1), "r" (arg2));
|
|
|
|
return function_id;
|
|
}
|
|
|
|
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 const struct of_device_id psci_of_match[] __initconst = {
|
|
{ .compatible = "arm,psci", },
|
|
{},
|
|
};
|
|
|
|
void __init psci_init(void)
|
|
{
|
|
struct device_node *np;
|
|
const char *method;
|
|
u32 id;
|
|
|
|
np = of_find_matching_node(NULL, psci_of_match);
|
|
if (!np)
|
|
return;
|
|
|
|
pr_info("probing function IDs from device-tree\n");
|
|
|
|
if (of_property_read_string(np, "method", &method)) {
|
|
pr_warning("missing \"method\" property\n");
|
|
goto out_put_node;
|
|
}
|
|
|
|
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_warning("invalid \"method\" property: %s\n", method);
|
|
goto out_put_node;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static int __init cpu_psci_cpu_init(struct device_node *dn, unsigned int cpu)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int __init cpu_psci_cpu_prepare(unsigned int cpu)
|
|
{
|
|
if (!psci_ops.cpu_on) {
|
|
pr_err("no cpu_on method, not booting CPU%d\n", cpu);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpu_psci_cpu_boot(unsigned int cpu)
|
|
{
|
|
int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa(secondary_entry));
|
|
if (err)
|
|
pr_err("failed to boot CPU%d (%d)\n", cpu, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
static int cpu_psci_cpu_disable(unsigned int cpu)
|
|
{
|
|
/* Fail early if we don't have CPU_OFF support */
|
|
if (!psci_ops.cpu_off)
|
|
return -EOPNOTSUPP;
|
|
return 0;
|
|
}
|
|
|
|
static void cpu_psci_cpu_die(unsigned int cpu)
|
|
{
|
|
int ret;
|
|
/*
|
|
* There are no known implementations of PSCI actually using the
|
|
* power state field, pass a sensible default for now.
|
|
*/
|
|
struct psci_power_state state = {
|
|
.type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
|
|
};
|
|
|
|
ret = psci_ops.cpu_off(state);
|
|
|
|
pr_crit("unable to power off CPU%u (%d)\n", cpu, ret);
|
|
}
|
|
#endif
|
|
|
|
const struct cpu_operations cpu_psci_ops = {
|
|
.name = "psci",
|
|
.cpu_init = cpu_psci_cpu_init,
|
|
.cpu_prepare = cpu_psci_cpu_prepare,
|
|
.cpu_boot = cpu_psci_cpu_boot,
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.cpu_disable = cpu_psci_cpu_disable,
|
|
.cpu_die = cpu_psci_cpu_die,
|
|
#endif
|
|
};
|
|
|
|
#endif
|