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 77 return ret; 78 } 79 80 #ifdef CONFIG_OF_CONTROL 81 int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset, 82 bool pre_reloc_only) 83 { 84 int ret = 0, err; 85 86 for (offset = fdt_first_subnode(blob, offset); 87 offset > 0; 88 offset = fdt_next_subnode(blob, offset)) { 89 if (pre_reloc_only && 90 !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL)) 91 continue; 92 err = lists_bind_fdt(parent, blob, offset, NULL); 93 if (err && !ret) 94 ret = err; 95 } 96 97 if (ret) 98 dm_warn("Some drivers failed to bind\n"); 99 100 return ret; 101 } 102 103 int dm_scan_fdt(const void *blob, bool pre_reloc_only) 104 { 105 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only); 106 } 107 #endif 108 109 __weak int dm_scan_other(bool pre_reloc_only) 110 { 111 return 0; 112 } 113 114 int dm_init_and_scan(bool pre_reloc_only) 115 { 116 int ret; 117 118 ret = dm_init(); 119 if (ret) { 120 debug("dm_init() failed: %d\n", ret); 121 return ret; 122 } 123 ret = dm_scan_platdata(pre_reloc_only); 124 if (ret) { 125 debug("dm_scan_platdata() failed: %d\n", ret); 126 return ret; 127 } 128 #ifdef CONFIG_OF_CONTROL 129 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only); 130 if (ret) { 131 debug("dm_scan_fdt() failed: %d\n", ret); 132 return ret; 133 } 134 #endif 135 ret = dm_scan_other(pre_reloc_only); 136 if (ret) 137 return ret; 138 139 return 0; 140 } 141 142 /* This is the root driver - all drivers are children of this */ 143 U_BOOT_DRIVER(root_driver) = { 144 .name = "root_driver", 145 .id = UCLASS_ROOT, 146 }; 147 148 /* This is the root uclass */ 149 UCLASS_DRIVER(root) = { 150 .name = "root", 151 .id = UCLASS_ROOT, 152 }; 153