1 /* 2 * Copyright 2016 NXP Semiconductor, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <libfdt.h> 9 #include <fdt_support.h> 10 #include <linux/sizes.h> 11 #include <linux/kernel.h> 12 #include <asm/psci.h> 13 #ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT 14 #include <asm/armv8/sec_firmware.h> 15 #endif 16 17 int fdt_psci(void *fdt) 18 { 19 #if defined(CONFIG_ARMV8_PSCI) || defined(CONFIG_ARMV7_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 #endif 69 switch (psci_ver) { 70 case ARM_PSCI_VER_1_0: 71 tmp = fdt_setprop_string(fdt, nodeoff, 72 "compatible", "arm,psci-1.0"); 73 if (tmp) 74 return tmp; 75 case ARM_PSCI_VER_0_2: 76 tmp = fdt_appendprop_string(fdt, nodeoff, 77 "compatible", "arm,psci-0.2"); 78 if (tmp) 79 return tmp; 80 default: 81 /* 82 * The Secure firmware framework isn't able to support PSCI version 0.1. 83 */ 84 #ifndef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT 85 tmp = fdt_appendprop_string(fdt, nodeoff, 86 "compatible", "arm,psci"); 87 if (tmp) 88 return tmp; 89 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend", 90 ARM_PSCI_FN_CPU_SUSPEND); 91 if (tmp) 92 return tmp; 93 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off", 94 ARM_PSCI_FN_CPU_OFF); 95 if (tmp) 96 return tmp; 97 tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on", 98 ARM_PSCI_FN_CPU_ON); 99 if (tmp) 100 return tmp; 101 tmp = fdt_setprop_u32(fdt, nodeoff, "migrate", 102 ARM_PSCI_FN_MIGRATE); 103 if (tmp) 104 return tmp; 105 #endif 106 break; 107 } 108 109 tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc"); 110 if (tmp) 111 return tmp; 112 113 #endif 114 return 0; 115 } 116