1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2016 NXP Semiconductor, Inc. 4 */ 5 6 #include <common.h> 7 #include <linux/libfdt.h> 8 #include <fdt_support.h> 9 #include <linux/sizes.h> 10 #include <linux/kernel.h> 11 #include <asm/psci.h> 12 #ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT 13 #include <asm/armv8/sec_firmware.h> 14 #endif 15 16 int fdt_psci(void *fdt) 17 { 18 #if defined(CONFIG_ARMV7_PSCI) || defined(CONFIG_ARMV8_PSCI) || \ 19 defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI) 20 int nodeoff; 21 unsigned int psci_ver = 0; 22 int tmp; 23 24 nodeoff = fdt_path_offset(fdt, "/cpus"); 25 if (nodeoff < 0) { 26 printf("couldn't find /cpus\n"); 27 return nodeoff; 28 } 29 30 /* add 'enable-method = "psci"' to each cpu node */ 31 for (tmp = fdt_first_subnode(fdt, nodeoff); 32 tmp >= 0; 33 tmp = fdt_next_subnode(fdt, tmp)) { 34 const struct fdt_property *prop; 35 int len; 36 37 prop = fdt_get_property(fdt, tmp, "device_type", &len); 38 if (!prop) 39 continue; 40 if (len < 4) 41 continue; 42 if (strcmp(prop->data, "cpu")) 43 continue; 44 45 /* 46 * Not checking rv here, our approach is to skip over errors in 47 * individual cpu nodes, hopefully some of the nodes are 48 * processed correctly and those will boot 49 */ 50 fdt_setprop_string(fdt, tmp, "enable-method", "psci"); 51 } 52 53 nodeoff = fdt_path_offset(fdt, "/psci"); 54 if (nodeoff >= 0) 55 goto init_psci_node; 56 57 nodeoff = fdt_path_offset(fdt, "/"); 58 if (nodeoff < 0) 59 return nodeoff; 60 61 nodeoff = fdt_add_subnode(fdt, nodeoff, "psci"); 62 if (nodeoff < 0) 63 return nodeoff; 64 65 init_psci_node: 66 #ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT 67 psci_ver = sec_firmware_support_psci_version(); 68 #elif defined(CONFIG_ARMV7_PSCI_1_0) || defined(CONFIG_ARMV8_PSCI) 69 psci_ver = ARM_PSCI_VER_1_0; 70 #elif defined(CONFIG_ARMV7_PSCI_0_2) 71 psci_ver = ARM_PSCI_VER_0_2; 72 #endif 73 if (psci_ver >= ARM_PSCI_VER_1_0) { 74 tmp = fdt_setprop_string(fdt, nodeoff, 75 "compatible", "arm,psci-1.0"); 76 if (tmp) 77 return tmp; 78 } 79 80 if (psci_ver >= ARM_PSCI_VER_0_2) { 81 tmp = fdt_appendprop_string(fdt, nodeoff, 82 "compatible", "arm,psci-0.2"); 83 if (tmp) 84 return tmp; 85 } 86 87 #ifndef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT 88 /* 89 * The Secure firmware framework isn't able to support PSCI version 0.1. 90 */ 91 if (psci_ver < ARM_PSCI_VER_0_2) { 92 tmp = fdt_appendprop_string(fdt, nodeoff, 93 "compatible", "arm,psci"); 94 if (tmp) 95 return tmp; 96 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend", 97 ARM_PSCI_FN_CPU_SUSPEND); 98 if (tmp) 99 return tmp; 100 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off", 101 ARM_PSCI_FN_CPU_OFF); 102 if (tmp) 103 return tmp; 104 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on", 105 ARM_PSCI_FN_CPU_ON); 106 if (tmp) 107 return tmp; 108 tmp = fdt_setprop_u32(fdt, nodeoff, "migrate", 109 ARM_PSCI_FN_MIGRATE); 110 if (tmp) 111 return tmp; 112 } 113 #endif 114 115 tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc"); 116 if (tmp) 117 return tmp; 118 119 tmp = fdt_setprop_string(fdt, nodeoff, "status", "okay"); 120 if (tmp) 121 return tmp; 122 123 #endif 124 return 0; 125 } 126