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@@ -0,0 +1,123 @@
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+/*
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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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+
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+#include <common.h>
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+#include <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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+
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+int fdt_psci(void *fdt)
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+{
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+#if defined(CONFIG_ARMV8_PSCI) || defined(CONFIG_ARMV7_PSCI)
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+ int nodeoff;
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+ unsigned int psci_ver = 0;
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+ char *psci_compt;
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+ int tmp;
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+
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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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+
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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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+
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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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+ /*
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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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+
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+ /*
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+ * The PSCI node might be called "/psci" or might be called something
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+ * else but contain either of the compatible strings
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+ * "arm,psci"/"arm,psci-0.2"
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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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+
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+ nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci");
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+ if (nodeoff >= 0)
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+ goto init_psci_node;
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+
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+ nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-0.2");
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+ if (nodeoff >= 0)
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+ goto init_psci_node;
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+
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+ nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-1.0");
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+ if (nodeoff >= 0)
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+ goto init_psci_node;
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+
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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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+
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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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+
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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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+#endif
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+ switch (psci_ver) {
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+ case 0x00010000:
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+ psci_compt = "arm,psci-1.0";
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+ break;
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+ case 0x00000002:
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+ psci_compt = "arm,psci-0.2";
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+ break;
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+ default:
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+ psci_compt = "arm,psci";
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+ break;
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+ }
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+
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+ tmp = fdt_setprop_string(fdt, nodeoff, "compatible", psci_compt);
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+ if (tmp)
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+ return tmp;
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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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+
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+#ifdef CONFIG_ARMV7_PSCI
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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", 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", 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", 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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+#endif
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+ return 0;
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+}
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