1 /* 2 * Copyright (c) 2013 Google, Inc 3 * 4 * (C) Copyright 2012 5 * Pavel Herrmann <morpheus.ibis@gmail.com> 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <errno.h> 12 #include <malloc.h> 13 #include <libfdt.h> 14 #include <dm/device.h> 15 #include <dm/device-internal.h> 16 #include <dm/lists.h> 17 #include <dm/platdata.h> 18 #include <dm/root.h> 19 #include <dm/uclass.h> 20 #include <dm/util.h> 21 #include <linux/list.h> 22 23 DECLARE_GLOBAL_DATA_PTR; 24 25 static const struct driver_info root_info = { 26 .name = "root_driver", 27 }; 28 29 struct udevice *dm_root(void) 30 { 31 if (!gd->dm_root) { 32 dm_warn("Virtual root driver does not exist!\n"); 33 return NULL; 34 } 35 36 return gd->dm_root; 37 } 38 39 int dm_init(void) 40 { 41 int ret; 42 43 if (gd->dm_root) { 44 dm_warn("Virtual root driver already exists!\n"); 45 return -EINVAL; 46 } 47 INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST); 48 49 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST); 50 if (ret) 51 return ret; 52 ret = device_probe(DM_ROOT_NON_CONST); 53 if (ret) 54 return ret; 55 56 return 0; 57 } 58 59 int dm_uninit(void) 60 { 61 device_remove(dm_root()); 62 device_unbind(dm_root()); 63 64 return 0; 65 } 66 67 int dm_scan_platdata(bool pre_reloc_only) 68 { 69 int ret; 70 71 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only); 72 if (ret == -ENOENT) { 73 dm_warn("Some drivers were not found\n"); 74 ret = 0; 75 } 76 if (ret) 77 return ret; 78 79 return 0; 80 } 81 82 #ifdef CONFIG_OF_CONTROL 83 int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset, 84 bool pre_reloc_only) 85 { 86 int ret = 0, err; 87 88 for (offset = fdt_first_subnode(blob, offset); 89 offset > 0; 90 offset = fdt_next_subnode(blob, offset)) { 91 if (pre_reloc_only && 92 !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL)) 93 continue; 94 err = lists_bind_fdt(parent, blob, offset, NULL); 95 if (err && !ret) 96 ret = err; 97 } 98 99 if (ret) 100 dm_warn("Some drivers failed to bind\n"); 101 102 return ret; 103 } 104 105 int dm_scan_fdt(const void *blob, bool pre_reloc_only) 106 { 107 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only); 108 } 109 #endif 110 111 __weak int dm_scan_other(bool pre_reloc_only) 112 { 113 return 0; 114 } 115 116 int dm_init_and_scan(bool pre_reloc_only) 117 { 118 int ret; 119 120 ret = dm_init(); 121 if (ret) { 122 debug("dm_init() failed: %d\n", ret); 123 return ret; 124 } 125 ret = dm_scan_platdata(pre_reloc_only); 126 if (ret) { 127 debug("dm_scan_platdata() failed: %d\n", ret); 128 return ret; 129 } 130 #ifdef CONFIG_OF_CONTROL 131 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only); 132 if (ret) { 133 debug("dm_scan_fdt() failed: %d\n", ret); 134 return ret; 135 } 136 #endif 137 ret = dm_scan_other(pre_reloc_only); 138 if (ret) 139 return ret; 140 141 return 0; 142 } 143 144 /* This is the root driver - all drivers are children of this */ 145 U_BOOT_DRIVER(root_driver) = { 146 .name = "root_driver", 147 .id = UCLASS_ROOT, 148 }; 149 150 /* This is the root uclass */ 151 UCLASS_DRIVER(root) = { 152 .name = "root", 153 .id = UCLASS_ROOT, 154 }; 155