| Hou Zhiqiang | 45684ae | 2016-06-28 20:18:16 +0800 | [diff] [blame] | 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 | char *psci_compt; |
| 23 | int tmp; |
| 24 | |
| 25 | nodeoff = fdt_path_offset(fdt, "/cpus"); |
| 26 | if (nodeoff < 0) { |
| 27 | printf("couldn't find /cpus\n"); |
| 28 | return nodeoff; |
| 29 | } |
| 30 | |
| 31 | /* add 'enable-method = "psci"' to each cpu node */ |
| 32 | for (tmp = fdt_first_subnode(fdt, nodeoff); |
| 33 | tmp >= 0; |
| 34 | tmp = fdt_next_subnode(fdt, tmp)) { |
| 35 | const struct fdt_property *prop; |
| 36 | int len; |
| 37 | |
| 38 | prop = fdt_get_property(fdt, tmp, "device_type", &len); |
| 39 | if (!prop) |
| 40 | continue; |
| 41 | if (len < 4) |
| 42 | continue; |
| 43 | if (strcmp(prop->data, "cpu")) |
| 44 | continue; |
| 45 | |
| 46 | /* |
| 47 | * Not checking rv here, our approach is to skip over errors in |
| 48 | * individual cpu nodes, hopefully some of the nodes are |
| 49 | * processed correctly and those will boot |
| 50 | */ |
| 51 | fdt_setprop_string(fdt, tmp, "enable-method", "psci"); |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | * The PSCI node might be called "/psci" or might be called something |
| 56 | * else but contain either of the compatible strings |
| 57 | * "arm,psci"/"arm,psci-0.2" |
| 58 | */ |
| 59 | nodeoff = fdt_path_offset(fdt, "/psci"); |
| 60 | if (nodeoff >= 0) |
| 61 | goto init_psci_node; |
| 62 | |
| 63 | nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci"); |
| 64 | if (nodeoff >= 0) |
| 65 | goto init_psci_node; |
| 66 | |
| 67 | nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-0.2"); |
| 68 | if (nodeoff >= 0) |
| 69 | goto init_psci_node; |
| 70 | |
| 71 | nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-1.0"); |
| 72 | if (nodeoff >= 0) |
| 73 | goto init_psci_node; |
| 74 | |
| 75 | nodeoff = fdt_path_offset(fdt, "/"); |
| 76 | if (nodeoff < 0) |
| 77 | return nodeoff; |
| 78 | |
| 79 | nodeoff = fdt_add_subnode(fdt, nodeoff, "psci"); |
| 80 | if (nodeoff < 0) |
| 81 | return nodeoff; |
| 82 | |
| 83 | init_psci_node: |
| 84 | #ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT |
| 85 | psci_ver = sec_firmware_support_psci_version(); |
| 86 | #endif |
| 87 | switch (psci_ver) { |
| 88 | case 0x00010000: |
| 89 | psci_compt = "arm,psci-1.0"; |
| 90 | break; |
| 91 | case 0x00000002: |
| 92 | psci_compt = "arm,psci-0.2"; |
| 93 | break; |
| 94 | default: |
| 95 | psci_compt = "arm,psci"; |
| 96 | break; |
| 97 | } |
| 98 | |
| 99 | tmp = fdt_setprop_string(fdt, nodeoff, "compatible", psci_compt); |
| 100 | if (tmp) |
| 101 | return tmp; |
| 102 | tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc"); |
| 103 | if (tmp) |
| 104 | return tmp; |
| 105 | |
| 106 | #ifdef CONFIG_ARMV7_PSCI |
| 107 | tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend", |
| 108 | ARM_PSCI_FN_CPU_SUSPEND); |
| 109 | if (tmp) |
| 110 | return tmp; |
| 111 | tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off", ARM_PSCI_FN_CPU_OFF); |
| 112 | if (tmp) |
| 113 | return tmp; |
| 114 | tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on", ARM_PSCI_FN_CPU_ON); |
| 115 | if (tmp) |
| 116 | return tmp; |
| 117 | tmp = fdt_setprop_u32(fdt, nodeoff, "migrate", ARM_PSCI_FN_MIGRATE); |
| 118 | if (tmp) |
| 119 | return tmp; |
| 120 | #endif |
| 121 | #endif |
| 122 | return 0; |
| 123 | } |