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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | // 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; } |