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 #endif 71 if (psci_ver >= ARM_PSCI_VER_1_0) { 72 tmp = fdt_setprop_string(fdt, nodeoff, 73 "compatible", "arm,psci-1.0"); 74 if (tmp) 75 return tmp; 76 } 77 78 if (psci_ver >= ARM_PSCI_VER_0_2) { 79 tmp = fdt_appendprop_string(fdt, nodeoff, 80 "compatible", "arm,psci-0.2"); 81 if (tmp) 82 return tmp; 83 } 84 85 #ifndef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT 86 /* 87 * The Secure firmware framework isn't able to support PSCI version 0.1. 88 */ 89 if (psci_ver < ARM_PSCI_VER_0_2) { 90 tmp = fdt_appendprop_string(fdt, nodeoff, 91 "compatible", "arm,psci"); 92 if (tmp) 93 return tmp; 94 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend", 95 ARM_PSCI_FN_CPU_SUSPEND); 96 if (tmp) 97 return tmp; 98 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off", 99 ARM_PSCI_FN_CPU_OFF); 100 if (tmp) 101 return tmp; 102 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on", 103 ARM_PSCI_FN_CPU_ON); 104 if (tmp) 105 return tmp; 106 tmp = fdt_setprop_u32(fdt, nodeoff, "migrate", 107 ARM_PSCI_FN_MIGRATE); 108 if (tmp) 109 return tmp; 110 } 111 #endif 112 113 tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc"); 114 if (tmp) 115 return tmp; 116 117 #endif 118 return 0; 119 } 120