1 /* 2 * Device manager 3 * 4 * Copyright (c) 2013 Google, Inc 5 * 6 * (C) Copyright 2012 7 * Pavel Herrmann <morpheus.ibis@gmail.com> 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <fdtdec.h> 14 #include <malloc.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/uclass.h> 20 #include <dm/uclass-internal.h> 21 #include <dm/util.h> 22 #include <linux/err.h> 23 #include <linux/list.h> 24 25 DECLARE_GLOBAL_DATA_PTR; 26 27 int device_bind(struct udevice *parent, struct driver *drv, const char *name, 28 void *platdata, int of_offset, struct udevice **devp) 29 { 30 struct udevice *dev; 31 struct uclass *uc; 32 int ret = 0; 33 34 *devp = NULL; 35 if (!name) 36 return -EINVAL; 37 38 ret = uclass_get(drv->id, &uc); 39 if (ret) 40 return ret; 41 42 dev = calloc(1, sizeof(struct udevice)); 43 if (!dev) 44 return -ENOMEM; 45 46 INIT_LIST_HEAD(&dev->sibling_node); 47 INIT_LIST_HEAD(&dev->child_head); 48 INIT_LIST_HEAD(&dev->uclass_node); 49 dev->platdata = platdata; 50 dev->name = name; 51 dev->of_offset = of_offset; 52 dev->parent = parent; 53 dev->driver = drv; 54 dev->uclass = uc; 55 56 /* 57 * For some devices, such as a SPI or I2C bus, the 'reg' property 58 * is a reasonable indicator of the sequence number. But if there is 59 * an alias, we use that in preference. In any case, this is just 60 * a 'requested' sequence, and will be resolved (and ->seq updated) 61 * when the device is probed. 62 */ 63 dev->seq = -1; 64 #ifdef CONFIG_OF_CONTROL 65 dev->req_seq = fdtdec_get_int(gd->fdt_blob, of_offset, "reg", -1); 66 if (!IS_ERR_VALUE(dev->req_seq)) 67 dev->req_seq &= INT_MAX; 68 if (uc->uc_drv->name && of_offset != -1) { 69 fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name, of_offset, 70 &dev->req_seq); 71 } 72 #else 73 dev->req_seq = -1; 74 #endif 75 if (!dev->platdata && drv->platdata_auto_alloc_size) 76 dev->flags |= DM_FLAG_ALLOC_PDATA; 77 78 /* put dev into parent's successor list */ 79 if (parent) 80 list_add_tail(&dev->sibling_node, &parent->child_head); 81 82 ret = uclass_bind_device(dev); 83 if (ret) 84 goto fail_uclass_bind; 85 86 /* if we fail to bind we remove device from successors and free it */ 87 if (drv->bind) { 88 ret = drv->bind(dev); 89 if (ret) 90 goto fail_bind; 91 } 92 if (parent) 93 dm_dbg("Bound device %s to %s\n", dev->name, parent->name); 94 *devp = dev; 95 96 return 0; 97 98 fail_bind: 99 if (uclass_unbind_device(dev)) { 100 dm_warn("Failed to unbind dev '%s' on error path\n", 101 dev->name); 102 } 103 fail_uclass_bind: 104 if (parent) 105 list_del(&dev->sibling_node); 106 free(dev); 107 108 return ret; 109 } 110 111 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only, 112 const struct driver_info *info, struct udevice **devp) 113 { 114 struct driver *drv; 115 116 drv = lists_driver_lookup_name(info->name); 117 if (!drv) 118 return -ENOENT; 119 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC)) 120 return -EPERM; 121 122 return device_bind(parent, drv, info->name, (void *)info->platdata, 123 -1, devp); 124 } 125 126 int device_probe_child(struct udevice *dev, void *parent_priv) 127 { 128 struct driver *drv; 129 int size = 0; 130 int ret; 131 int seq; 132 133 if (!dev) 134 return -EINVAL; 135 136 if (dev->flags & DM_FLAG_ACTIVATED) 137 return 0; 138 139 drv = dev->driver; 140 assert(drv); 141 142 /* Allocate private data and platdata if requested */ 143 if (drv->priv_auto_alloc_size) { 144 dev->priv = calloc(1, drv->priv_auto_alloc_size); 145 if (!dev->priv) { 146 ret = -ENOMEM; 147 goto fail; 148 } 149 } 150 /* Allocate private data if requested */ 151 if (dev->flags & DM_FLAG_ALLOC_PDATA) { 152 dev->platdata = calloc(1, drv->platdata_auto_alloc_size); 153 if (!dev->platdata) { 154 ret = -ENOMEM; 155 goto fail; 156 } 157 } 158 size = dev->uclass->uc_drv->per_device_auto_alloc_size; 159 if (size) { 160 dev->uclass_priv = calloc(1, size); 161 if (!dev->uclass_priv) { 162 ret = -ENOMEM; 163 goto fail; 164 } 165 } 166 167 /* Ensure all parents are probed */ 168 if (dev->parent) { 169 size = dev->parent->driver->per_child_auto_alloc_size; 170 if (size) { 171 dev->parent_priv = calloc(1, size); 172 if (!dev->parent_priv) { 173 ret = -ENOMEM; 174 goto fail; 175 } 176 if (parent_priv) 177 memcpy(dev->parent_priv, parent_priv, size); 178 } 179 180 ret = device_probe(dev->parent); 181 if (ret) 182 goto fail; 183 } 184 185 seq = uclass_resolve_seq(dev); 186 if (seq < 0) { 187 ret = seq; 188 goto fail; 189 } 190 dev->seq = seq; 191 192 if (dev->parent && dev->parent->driver->child_pre_probe) { 193 ret = dev->parent->driver->child_pre_probe(dev); 194 if (ret) 195 goto fail; 196 } 197 198 if (drv->ofdata_to_platdata && dev->of_offset >= 0) { 199 ret = drv->ofdata_to_platdata(dev); 200 if (ret) 201 goto fail; 202 } 203 204 if (drv->probe) { 205 ret = drv->probe(dev); 206 if (ret) 207 goto fail; 208 } 209 210 dev->flags |= DM_FLAG_ACTIVATED; 211 212 ret = uclass_post_probe_device(dev); 213 if (ret) { 214 dev->flags &= ~DM_FLAG_ACTIVATED; 215 goto fail_uclass; 216 } 217 218 return 0; 219 fail_uclass: 220 if (device_remove(dev)) { 221 dm_warn("%s: Device '%s' failed to remove on error path\n", 222 __func__, dev->name); 223 } 224 fail: 225 dev->seq = -1; 226 device_free(dev); 227 228 return ret; 229 } 230 231 int device_probe(struct udevice *dev) 232 { 233 return device_probe_child(dev, NULL); 234 } 235 236 void *dev_get_platdata(struct udevice *dev) 237 { 238 if (!dev) { 239 dm_warn("%s: null device\n", __func__); 240 return NULL; 241 } 242 243 return dev->platdata; 244 } 245 246 void *dev_get_priv(struct udevice *dev) 247 { 248 if (!dev) { 249 dm_warn("%s: null device\n", __func__); 250 return NULL; 251 } 252 253 return dev->priv; 254 } 255 256 void *dev_get_parentdata(struct udevice *dev) 257 { 258 if (!dev) { 259 dm_warn("%s: null device\n", __func__); 260 return NULL; 261 } 262 263 return dev->parent_priv; 264 } 265 266 static int device_get_device_tail(struct udevice *dev, int ret, 267 struct udevice **devp) 268 { 269 if (ret) 270 return ret; 271 272 ret = device_probe(dev); 273 if (ret) 274 return ret; 275 276 *devp = dev; 277 278 return 0; 279 } 280 281 int device_get_child(struct udevice *parent, int index, struct udevice **devp) 282 { 283 struct udevice *dev; 284 285 list_for_each_entry(dev, &parent->child_head, sibling_node) { 286 if (!index--) 287 return device_get_device_tail(dev, 0, devp); 288 } 289 290 return -ENODEV; 291 } 292 293 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq, 294 bool find_req_seq, struct udevice **devp) 295 { 296 struct udevice *dev; 297 298 *devp = NULL; 299 if (seq_or_req_seq == -1) 300 return -ENODEV; 301 302 list_for_each_entry(dev, &parent->child_head, sibling_node) { 303 if ((find_req_seq ? dev->req_seq : dev->seq) == 304 seq_or_req_seq) { 305 *devp = dev; 306 return 0; 307 } 308 } 309 310 return -ENODEV; 311 } 312 313 int device_get_child_by_seq(struct udevice *parent, int seq, 314 struct udevice **devp) 315 { 316 struct udevice *dev; 317 int ret; 318 319 *devp = NULL; 320 ret = device_find_child_by_seq(parent, seq, false, &dev); 321 if (ret == -ENODEV) { 322 /* 323 * We didn't find it in probed devices. See if there is one 324 * that will request this seq if probed. 325 */ 326 ret = device_find_child_by_seq(parent, seq, true, &dev); 327 } 328 return device_get_device_tail(dev, ret, devp); 329 } 330 331 int device_find_child_by_of_offset(struct udevice *parent, int of_offset, 332 struct udevice **devp) 333 { 334 struct udevice *dev; 335 336 *devp = NULL; 337 338 list_for_each_entry(dev, &parent->child_head, sibling_node) { 339 if (dev->of_offset == of_offset) { 340 *devp = dev; 341 return 0; 342 } 343 } 344 345 return -ENODEV; 346 } 347 348 int device_get_child_by_of_offset(struct udevice *parent, int seq, 349 struct udevice **devp) 350 { 351 struct udevice *dev; 352 int ret; 353 354 *devp = NULL; 355 ret = device_find_child_by_of_offset(parent, seq, &dev); 356 return device_get_device_tail(dev, ret, devp); 357 } 358 359 int device_find_first_child(struct udevice *parent, struct udevice **devp) 360 { 361 if (list_empty(&parent->child_head)) { 362 *devp = NULL; 363 } else { 364 *devp = list_first_entry(&parent->child_head, struct udevice, 365 sibling_node); 366 } 367 368 return 0; 369 } 370 371 int device_find_next_child(struct udevice **devp) 372 { 373 struct udevice *dev = *devp; 374 struct udevice *parent = dev->parent; 375 376 if (list_is_last(&dev->sibling_node, &parent->child_head)) { 377 *devp = NULL; 378 } else { 379 *devp = list_entry(dev->sibling_node.next, struct udevice, 380 sibling_node); 381 } 382 383 return 0; 384 } 385 386 struct udevice *dev_get_parent(struct udevice *child) 387 { 388 return child->parent; 389 } 390 391 ulong dev_get_of_data(struct udevice *dev) 392 { 393 return dev->of_id->data; 394 } 395