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/*
* Copyright 2016 NXP Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <libfdt.h>
#include <fdt_support.h>
#include <linux/sizes.h>
#include <linux/kernel.h>
#include <asm/psci.h>
#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
#include <asm/armv8/sec_firmware.h>
#endif
int fdt_psci(void *fdt)
{
#if defined(CONFIG_ARMV8_PSCI) || defined(CONFIG_ARMV7_PSCI)
int nodeoff;
unsigned int psci_ver = 0;
char *psci_compt;
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");
}
/*
* The PSCI node might be called "/psci" or might be called something
* else but contain either of the compatible strings
* "arm,psci"/"arm,psci-0.2"
*/
nodeoff = fdt_path_offset(fdt, "/psci");
if (nodeoff >= 0)
goto init_psci_node;
nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci");
if (nodeoff >= 0)
goto init_psci_node;
nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-0.2");
if (nodeoff >= 0)
goto init_psci_node;
nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-1.0");
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:
#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
psci_ver = sec_firmware_support_psci_version();
#endif
switch (psci_ver) {
case 0x00010000:
psci_compt = "arm,psci-1.0";
break;
case 0x00000002:
psci_compt = "arm,psci-0.2";
break;
default:
psci_compt = "arm,psci";
break;
}
tmp = fdt_setprop_string(fdt, nodeoff, "compatible", psci_compt);
if (tmp)
return tmp;
tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc");
if (tmp)
return tmp;
#ifdef CONFIG_ARMV7_PSCI
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
#endif
return 0;
}
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