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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
*/
#include <rthw.h>
#include <rtthread.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "cpu.h"
#include "psci.h"
#include "psci_api.h"
#include "smccc.h"
#define DBG_TAG "libcpu.aarch64.psci"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
/** template for creating 4 PSCI ops: SUSPEND, OFF, ON, MIGRATE */
#define COMMON_PSCI_OPS_TEMPLATE(VER, SUSPEND, OFF, ON, MIGRATE) \
static int psci_##VER##_cpu_suspend(uint32_t state, unsigned long entry_point) \
{ \
return psci_call((SUSPEND), state, entry_point, 0); \
} \
static int psci_##VER##_cpu_off(uint32_t state) \
{ \
return psci_call((OFF), state, 0, 0); \
} \
static int psci_##VER##_cpu_on(unsigned long cpuid, unsigned long entry_point) \
{ \
return psci_call((ON), cpuid, entry_point, 0); \
} \
static int psci_##VER##_migrate(unsigned long cpuid) \
{ \
return psci_call((MIGRATE), cpuid, 0, 0); \
}
struct psci_ops_t psci_ops;
#ifdef RT_USING_FDT
#include "dtb_node.h"
#if __SIZE_WIDTH__ == 64
#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
#else
#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
#endif
/**
* SMCCC can use either smc or hvc method
* smccc_call will be init to proper interface when psci_init() was executed
*/
static void (*smccc_call)(unsigned long a0, unsigned long a1, unsigned long a2,
unsigned long a3, unsigned long a4, unsigned long a5,
unsigned long a6, unsigned long a7, struct arm_smccc_res_t *res,
struct arm_smccc_quirk_t *quirk);
static rt_uint32_t psci_call(unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3)
{
struct arm_smccc_res_t res;
smccc_call(a0, a1, a2, a3, 0, 0, 0, 0, &res, (void *)0);
return res.a0;
}
static int _psci_probe_version(char *version, int *major, int *minor);
static int _psci_init_with_version(int major, int minor);
static struct dtb_node *psci_node;
static int psci_ver_major;
static int psci_ver_minor;
/**
* @brief init psci operations.
* using device tree to probe version and psci-method,
* setup psci ops for future use
*
* @return int 0 on success
*/
int psci_init()
{
void *root = get_dtb_node_head();
psci_node = dtb_node_get_dtb_node_by_path(root, "/psci");
if (!psci_node)
{
LOG_E("No PSCI node found");
return -1;
}
char *compatible = dtb_node_get_dtb_node_property_value(psci_node, "compatible", NULL);
char *method = dtb_node_get_dtb_node_property_value(psci_node, "method", NULL);
int retval = 0;
// setup psci-method
if (!strcmp("hvc", method))
{
smccc_call = arm_smccc_hvc;
}
else if (!strcmp("smc", method))
{
smccc_call = arm_smccc_smc;
}
else
{
LOG_E("Unknown PSCI method: %s", method);
return -1;
}
LOG_D("Using psci method %s", method);
retval = _psci_probe_version(compatible, &psci_ver_major, &psci_ver_minor);
if (retval != 0)
return retval;
// init psci_ops with specified psci version
retval = _psci_init_with_version(psci_ver_major, psci_ver_minor);
return retval;
}
/* function id of PSCI v0.1 should be probed in FDT, they are implementation defined value */
static rt_uint32_t cpu_suspend_0_1;
static rt_uint32_t cpu_off_0_1;
static rt_uint32_t cpu_on_0_1;
static rt_uint32_t migrate_0_1;
/* basic operations TEMPLATE for API since 0.1 version */
COMMON_PSCI_OPS_TEMPLATE(0_1, cpu_suspend_0_1, cpu_off_0_1, cpu_on_0_1, migrate_0_1);
/* used for v0.1 only, rely on FDT to probe function id */
#define PROBE_AND_SET(FUNC_NAME) \
do \
{ \
int num_of_elem; \
funcid = \
dtb_node_get_dtb_node_property_value(psci_node, #FUNC_NAME, &num_of_elem); \
if (num_of_elem != 4 || funcid == 0 || *funcid == 0) \
{ \
LOG_E("Failed to probe " #FUNC_NAME " in FDT"); \
} \
else \
{ \
FUNC_NAME##_0_1 = (rt_uint32_t)fdt32_to_cpu(*funcid); \
psci_ops.FUNC_NAME = psci_0_1_##FUNC_NAME; \
} \
} while (0)
static int psci_0_1_init()
{
// reading function id from fdt
rt_uint32_t *funcid;
PROBE_AND_SET(cpu_suspend);
PROBE_AND_SET(cpu_off);
PROBE_AND_SET(cpu_on);
PROBE_AND_SET(migrate);
return 0;
}
COMMON_PSCI_OPS_TEMPLATE(0_2, PSCI_FN_NATIVE(0_2, CPU_SUSPEND), PSCI_0_2_FN_CPU_OFF, PSCI_FN_NATIVE(0_2, CPU_ON), PSCI_FN_NATIVE(0_2, MIGRATE));
static rt_uint32_t psci_0_2_get_version(void)
{
return psci_call(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
}
static void psci_0_2_set_basic_ops()
{
psci_ops = (struct psci_ops_t){
.get_version = psci_0_2_get_version,
// followings API are v0.1 compatible
.cpu_suspend = psci_0_2_cpu_suspend,
.cpu_off = psci_0_2_cpu_off,
.cpu_on = psci_0_2_cpu_on,
.migrate = psci_0_2_migrate,
};
}
static void psci_0_2_system_off(void)
{
psci_call(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
}
static void psci_0_2_system_reset(void)
{
psci_call(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
}
static int psci_0_2_init()
{
psci_0_2_set_basic_ops();
// TODO init other version 0.2 features...
// psci system off and reset which controlling machine
psci_ops.system_off = psci_0_2_system_off;
psci_ops.system_reset = psci_0_2_system_reset;
system_off = psci_0_2_system_off;
return 0;
}
/* PSCI v1.0 & after */
static int psci_1_0_features(uint32_t psci_func_id)
{
return psci_call(PSCI_1_0_FN_PSCI_FEATURES,
psci_func_id, 0, 0);
}
static int psci_1_0_init()
{
psci_0_2_init();
// TODO init other version 1.0 features...
// remove unsupported features
if (psci_1_0_features(PSCI_0_2_FN_SYSTEM_OFF) == PSCI_RET_NOT_SUPPORTED)
{
psci_ops.system_off = RT_NULL;
system_off = RT_NULL;
}
else
LOG_D("Using SYSTEM OFF feature");
if (psci_1_0_features(PSCI_0_2_FN_SYSTEM_RESET) == PSCI_RET_NOT_SUPPORTED)
psci_ops.system_reset = RT_NULL;
else
LOG_D("Using SYSTEM RESET feature");
return 0;
}
/* probe psci version from fdt or SMC call */
static int _psci_probe_version(char *version, int *major, int *minor)
{
int retval = 0;
// if strcmp compatible 'arm,psci-0.1'
if (!strcmp(version, "arm,psci"))
{
*major = 0;
*minor = 1;
}
else if (!strncmp(version, "arm,psci-", 8))
{
// since psci-0.2, using psci call to probe version
rt_uint32_t ret = psci_0_2_get_version();
*major = PSCI_VERSION_MAJOR(ret);
*minor = PSCI_VERSION_MINOR(ret);
}
else
{
LOG_E("[%s] was not a proper PSCI version", version);
retval = -1;
}
LOG_D("Using PSCI v%d.%d", *major, *minor);
return retval;
}
/* init psci ops with version info */
static int _psci_init_with_version(int major, int minor)
{
int retval = -0xbeef; // mark unsupported
if (major == 0)
{
// for v0.1, psci function id was provided fdt
if (minor == 1)
{
retval = psci_0_1_init();
}
else if (minor == 2)
{
retval = psci_0_2_init();
}
}
else if (major == 1)
{
// psci_1_0_init is a base setup for version after v1.0
retval = psci_1_0_init();
}
if (retval == -0xbeef)
{
LOG_E("PSCI init with incompatible version %d.%d", major, minor);
}
return retval;
}
#endif /* RT_USING_FDT */
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