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 <fdtdec.h> 13 #include <malloc.h> 14 #include <libfdt.h> 15 #include <dm/device.h> 16 #include <dm/device-internal.h> 17 #include <dm/lists.h> 18 #include <dm/platdata.h> 19 #include <dm/root.h> 20 #include <dm/uclass.h> 21 #include <dm/util.h> 22 #include <linux/list.h> 23 24 DECLARE_GLOBAL_DATA_PTR; 25 26 struct root_priv { 27 fdt_addr_t translation_offset; /* optional translation offset */ 28 }; 29 30 static const struct driver_info root_info = { 31 .name = "root_driver", 32 }; 33 34 struct udevice *dm_root(void) 35 { 36 if (!gd->dm_root) { 37 dm_warn("Virtual root driver does not exist!\n"); 38 return NULL; 39 } 40 41 return gd->dm_root; 42 } 43 44 fdt_addr_t dm_get_translation_offset(void) 45 { 46 struct udevice *root = dm_root(); 47 struct root_priv *priv = dev_get_priv(root); 48 49 return priv->translation_offset; 50 } 51 52 void dm_set_translation_offset(fdt_addr_t offs) 53 { 54 struct udevice *root = dm_root(); 55 struct root_priv *priv = dev_get_priv(root); 56 57 priv->translation_offset = offs; 58 } 59 60 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 61 void fix_drivers(void) 62 { 63 struct driver *drv = 64 ll_entry_start(struct driver, driver); 65 const int n_ents = ll_entry_count(struct driver, driver); 66 struct driver *entry; 67 68 for (entry = drv; entry != drv + n_ents; entry++) { 69 if (entry->of_match) 70 entry->of_match = (const struct udevice_id *) 71 ((u32)entry->of_match + gd->reloc_off); 72 if (entry->bind) 73 entry->bind += gd->reloc_off; 74 if (entry->probe) 75 entry->probe += gd->reloc_off; 76 if (entry->remove) 77 entry->remove += gd->reloc_off; 78 if (entry->unbind) 79 entry->unbind += gd->reloc_off; 80 if (entry->ofdata_to_platdata) 81 entry->ofdata_to_platdata += gd->reloc_off; 82 if (entry->child_post_bind) 83 entry->child_post_bind += gd->reloc_off; 84 if (entry->child_pre_probe) 85 entry->child_pre_probe += gd->reloc_off; 86 if (entry->child_post_remove) 87 entry->child_post_remove += gd->reloc_off; 88 /* OPS are fixed in every uclass post_probe function */ 89 if (entry->ops) 90 entry->ops += gd->reloc_off; 91 } 92 } 93 94 void fix_uclass(void) 95 { 96 struct uclass_driver *uclass = 97 ll_entry_start(struct uclass_driver, uclass); 98 const int n_ents = ll_entry_count(struct uclass_driver, uclass); 99 struct uclass_driver *entry; 100 101 for (entry = uclass; entry != uclass + n_ents; entry++) { 102 if (entry->post_bind) 103 entry->post_bind += gd->reloc_off; 104 if (entry->pre_unbind) 105 entry->pre_unbind += gd->reloc_off; 106 if (entry->pre_probe) 107 entry->pre_probe += gd->reloc_off; 108 if (entry->post_probe) 109 entry->post_probe += gd->reloc_off; 110 if (entry->pre_remove) 111 entry->pre_remove += gd->reloc_off; 112 if (entry->child_post_bind) 113 entry->child_post_bind += gd->reloc_off; 114 if (entry->child_pre_probe) 115 entry->child_pre_probe += gd->reloc_off; 116 if (entry->init) 117 entry->init += gd->reloc_off; 118 if (entry->destroy) 119 entry->destroy += gd->reloc_off; 120 /* FIXME maybe also need to fix these ops */ 121 if (entry->ops) 122 entry->ops += gd->reloc_off; 123 } 124 } 125 #endif 126 127 int dm_init(void) 128 { 129 int ret; 130 131 if (gd->dm_root) { 132 dm_warn("Virtual root driver already exists!\n"); 133 return -EINVAL; 134 } 135 INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST); 136 137 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 138 fix_drivers(); 139 fix_uclass(); 140 #endif 141 142 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST); 143 if (ret) 144 return ret; 145 #if CONFIG_IS_ENABLED(OF_CONTROL) 146 DM_ROOT_NON_CONST->of_offset = 0; 147 #endif 148 ret = device_probe(DM_ROOT_NON_CONST); 149 if (ret) 150 return ret; 151 152 return 0; 153 } 154 155 int dm_uninit(void) 156 { 157 device_remove(dm_root()); 158 device_unbind(dm_root()); 159 160 return 0; 161 } 162 163 int dm_scan_platdata(bool pre_reloc_only) 164 { 165 int ret; 166 167 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only); 168 if (ret == -ENOENT) { 169 dm_warn("Some drivers were not found\n"); 170 ret = 0; 171 } 172 173 return ret; 174 } 175 176 #if CONFIG_IS_ENABLED(OF_CONTROL) 177 int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset, 178 bool pre_reloc_only) 179 { 180 int ret = 0, err; 181 182 for (offset = fdt_first_subnode(blob, offset); 183 offset > 0; 184 offset = fdt_next_subnode(blob, offset)) { 185 if (pre_reloc_only && 186 !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL)) 187 continue; 188 if (!fdtdec_get_is_enabled(blob, offset)) { 189 dm_dbg(" - ignoring disabled device\n"); 190 continue; 191 } 192 err = lists_bind_fdt(parent, blob, offset, NULL); 193 if (err && !ret) { 194 ret = err; 195 debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL), 196 ret); 197 } 198 } 199 200 if (ret) 201 dm_warn("Some drivers failed to bind\n"); 202 203 return ret; 204 } 205 206 int dm_scan_fdt(const void *blob, bool pre_reloc_only) 207 { 208 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only); 209 } 210 #endif 211 212 __weak int dm_scan_other(bool pre_reloc_only) 213 { 214 return 0; 215 } 216 217 int dm_init_and_scan(bool pre_reloc_only) 218 { 219 int ret; 220 221 ret = dm_init(); 222 if (ret) { 223 debug("dm_init() failed: %d\n", ret); 224 return ret; 225 } 226 ret = dm_scan_platdata(pre_reloc_only); 227 if (ret) { 228 debug("dm_scan_platdata() failed: %d\n", ret); 229 return ret; 230 } 231 232 if (CONFIG_IS_ENABLED(OF_CONTROL)) { 233 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only); 234 if (ret) { 235 debug("dm_scan_fdt() failed: %d\n", ret); 236 return ret; 237 } 238 } 239 240 ret = dm_scan_other(pre_reloc_only); 241 if (ret) 242 return ret; 243 244 return 0; 245 } 246 247 /* This is the root driver - all drivers are children of this */ 248 U_BOOT_DRIVER(root_driver) = { 249 .name = "root_driver", 250 .id = UCLASS_ROOT, 251 .priv_auto_alloc_size = sizeof(struct root_priv), 252 }; 253 254 /* This is the root uclass */ 255 UCLASS_DRIVER(root) = { 256 .name = "root", 257 .id = UCLASS_ROOT, 258 }; 259