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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2016 NXP Semiconductor, Inc.
*/
#include <asm/cache.h>
#include <linux/libfdt.h>
#include <fdt_support.h>
#include <linux/sizes.h>
#include <linux/kernel.h>
#include <asm/psci.h>
#if CONFIG_IS_ENABLED(ARMV8_SEC_FIRMWARE_SUPPORT)
#include <asm/armv8/sec_firmware.h>
#endif
int fdt_psci(void *fdt)
{
#if defined(CONFIG_ARMV7_PSCI) || defined(CONFIG_ARMV8_PSCI) || \
defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI)
int nodeoff;
unsigned int psci_ver = 0;
int tmp;
nodeoff = fdt_path_offset(fdt, "/cpus");
if (nodeoff < 0) {
printf("couldn't find /cpus\n");
return nodeoff;
}
/* add 'enable-method = "psci"' to each cpu node */
for (tmp = fdt_first_subnode(fdt, nodeoff);
tmp >= 0;
tmp = fdt_next_subnode(fdt, tmp)) {
const struct fdt_property *prop;
int len;
prop = fdt_get_property(fdt, tmp, "device_type", &len);
if (!prop)
continue;
if (len < 4)
continue;
if (strcmp(prop->data, "cpu"))
continue;
/*
* Not checking rv here, our approach is to skip over errors in
* individual cpu nodes, hopefully some of the nodes are
* processed correctly and those will boot
*/
fdt_setprop_string(fdt, tmp, "enable-method", "psci");
}
nodeoff = fdt_path_offset(fdt, "/psci");
if (nodeoff >= 0)
goto init_psci_node;
nodeoff = fdt_path_offset(fdt, "/");
if (nodeoff < 0)
return nodeoff;
nodeoff = fdt_add_subnode(fdt, nodeoff, "psci");
if (nodeoff < 0)
return nodeoff;
init_psci_node:
#if CONFIG_IS_ENABLED(ARMV8_SEC_FIRMWARE_SUPPORT)
psci_ver = sec_firmware_support_psci_version();
#elif defined(CONFIG_ARMV7_PSCI_1_0) || defined(CONFIG_ARMV8_PSCI)
psci_ver = ARM_PSCI_VER_1_0;
#elif defined(CONFIG_ARMV7_PSCI_0_2)
psci_ver = ARM_PSCI_VER_0_2;
#endif
if (psci_ver >= ARM_PSCI_VER_1_0) {
tmp = fdt_setprop_string(fdt, nodeoff,
"compatible", "arm,psci-1.0");
if (tmp)
return tmp;
}
if (psci_ver >= ARM_PSCI_VER_0_2) {
tmp = fdt_appendprop_string(fdt, nodeoff,
"compatible", "arm,psci-0.2");
if (tmp)
return tmp;
}
#if !CONFIG_IS_ENABLED(ARMV8_SEC_FIRMWARE_SUPPORT)
/*
* The Secure firmware framework isn't able to support PSCI version 0.1.
*/
if (psci_ver < ARM_PSCI_VER_0_2) {
tmp = fdt_appendprop_string(fdt, nodeoff,
"compatible", "arm,psci");
if (tmp)
return tmp;
tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend",
ARM_PSCI_FN_CPU_SUSPEND);
if (tmp)
return tmp;
tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off",
ARM_PSCI_FN_CPU_OFF);
if (tmp)
return tmp;
tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on",
ARM_PSCI_FN_CPU_ON);
if (tmp)
return tmp;
tmp = fdt_setprop_u32(fdt, nodeoff, "migrate",
ARM_PSCI_FN_MIGRATE);
if (tmp)
return tmp;
}
#endif
tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc");
if (tmp)
return tmp;
tmp = fdt_setprop_string(fdt, nodeoff, "status", "okay");
if (tmp)
return tmp;
#endif
return 0;
}
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