u-boot/arch/arm/lib/psci-dt.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

119 lines
2.7 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2016 NXP Semiconductor, Inc.
*/
#include <common.h>
#include <linux/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_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:
#ifdef CONFIG_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;
#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;
}
#ifndef CONFIG_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;
#endif
return 0;
}