/*
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* Copyright 2016 NXP Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <linux/libfdt.h>
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#include <fdt_support.h>
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#include <linux/sizes.h>
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#include <linux/kernel.h>
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#include <asm/psci.h>
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#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
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#include <asm/armv8/sec_firmware.h>
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#endif
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int fdt_psci(void *fdt)
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{
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#if defined(CONFIG_ARMV7_PSCI) || defined(CONFIG_ARMV8_PSCI) || \
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defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI)
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int nodeoff;
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unsigned int psci_ver = 0;
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int tmp;
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nodeoff = fdt_path_offset(fdt, "/cpus");
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if (nodeoff < 0) {
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printf("couldn't find /cpus\n");
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return nodeoff;
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}
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/* add 'enable-method = "psci"' to each cpu node */
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for (tmp = fdt_first_subnode(fdt, nodeoff);
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tmp >= 0;
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tmp = fdt_next_subnode(fdt, tmp)) {
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const struct fdt_property *prop;
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int len;
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prop = fdt_get_property(fdt, tmp, "device_type", &len);
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if (!prop)
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continue;
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if (len < 4)
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continue;
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if (strcmp(prop->data, "cpu"))
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continue;
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/*
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* Not checking rv here, our approach is to skip over errors in
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* individual cpu nodes, hopefully some of the nodes are
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* processed correctly and those will boot
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*/
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fdt_setprop_string(fdt, tmp, "enable-method", "psci");
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}
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nodeoff = fdt_path_offset(fdt, "/psci");
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if (nodeoff >= 0)
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goto init_psci_node;
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nodeoff = fdt_path_offset(fdt, "/");
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if (nodeoff < 0)
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return nodeoff;
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nodeoff = fdt_add_subnode(fdt, nodeoff, "psci");
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if (nodeoff < 0)
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return nodeoff;
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init_psci_node:
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#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
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psci_ver = sec_firmware_support_psci_version();
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#elif defined(CONFIG_ARMV7_PSCI_1_0) || defined(CONFIG_ARMV8_PSCI)
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psci_ver = ARM_PSCI_VER_1_0;
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#endif
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switch (psci_ver) {
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case ARM_PSCI_VER_1_0:
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tmp = fdt_setprop_string(fdt, nodeoff,
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"compatible", "arm,psci-1.0");
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if (tmp)
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return tmp;
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case ARM_PSCI_VER_0_2:
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tmp = fdt_appendprop_string(fdt, nodeoff,
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"compatible", "arm,psci-0.2");
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if (tmp)
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return tmp;
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default:
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/*
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* The Secure firmware framework isn't able to support PSCI version 0.1.
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*/
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#ifndef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
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tmp = fdt_appendprop_string(fdt, nodeoff,
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"compatible", "arm,psci");
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if (tmp)
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return tmp;
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tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend",
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ARM_PSCI_FN_CPU_SUSPEND);
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if (tmp)
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return tmp;
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tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off",
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ARM_PSCI_FN_CPU_OFF);
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if (tmp)
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return tmp;
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tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on",
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ARM_PSCI_FN_CPU_ON);
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if (tmp)
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return tmp;
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tmp = fdt_setprop_u32(fdt, nodeoff, "migrate",
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ARM_PSCI_FN_MIGRATE);
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if (tmp)
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return tmp;
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#endif
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break;
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}
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tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc");
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if (tmp)
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return tmp;
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#endif
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return 0;
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}
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