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 dev->platdata = calloc(1, drv->platdata_auto_alloc_size); 78 if (!dev->platdata) { 79 ret = -ENOMEM; 80 goto fail_alloc1; 81 } 82 } 83 84 /* put dev into parent's successor list */ 85 if (parent) 86 list_add_tail(&dev->sibling_node, &parent->child_head); 87 88 ret = uclass_bind_device(dev); 89 if (ret) 90 goto fail_uclass_bind; 91 92 /* if we fail to bind we remove device from successors and free it */ 93 if (drv->bind) { 94 ret = drv->bind(dev); 95 if (ret) 96 goto fail_bind; 97 } 98 if (parent) 99 dm_dbg("Bound device %s to %s\n", dev->name, parent->name); 100 *devp = dev; 101 102 return 0; 103 104 fail_bind: 105 if (uclass_unbind_device(dev)) { 106 dm_warn("Failed to unbind dev '%s' on error path\n", 107 dev->name); 108 } 109 fail_uclass_bind: 110 if (parent) 111 list_del(&dev->sibling_node); 112 if (dev->flags & DM_FLAG_ALLOC_PDATA) { 113 free(dev->platdata); 114 dev->platdata = NULL; 115 } 116 fail_alloc1: 117 free(dev); 118 119 return ret; 120 } 121 122 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only, 123 const struct driver_info *info, struct udevice **devp) 124 { 125 struct driver *drv; 126 127 drv = lists_driver_lookup_name(info->name); 128 if (!drv) 129 return -ENOENT; 130 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC)) 131 return -EPERM; 132 133 return device_bind(parent, drv, info->name, (void *)info->platdata, 134 -1, devp); 135 } 136 137 int device_probe_child(struct udevice *dev, void *parent_priv) 138 { 139 struct driver *drv; 140 int size = 0; 141 int ret; 142 int seq; 143 144 if (!dev) 145 return -EINVAL; 146 147 if (dev->flags & DM_FLAG_ACTIVATED) 148 return 0; 149 150 drv = dev->driver; 151 assert(drv); 152 153 /* Allocate private data if requested */ 154 if (drv->priv_auto_alloc_size) { 155 dev->priv = calloc(1, drv->priv_auto_alloc_size); 156 if (!dev->priv) { 157 ret = -ENOMEM; 158 goto fail; 159 } 160 } 161 /* Allocate private data if requested */ 162 size = dev->uclass->uc_drv->per_device_auto_alloc_size; 163 if (size) { 164 dev->uclass_priv = calloc(1, size); 165 if (!dev->uclass_priv) { 166 ret = -ENOMEM; 167 goto fail; 168 } 169 } 170 171 /* Ensure all parents are probed */ 172 if (dev->parent) { 173 size = dev->parent->driver->per_child_auto_alloc_size; 174 if (size) { 175 dev->parent_priv = calloc(1, size); 176 if (!dev->parent_priv) { 177 ret = -ENOMEM; 178 goto fail; 179 } 180 if (parent_priv) 181 memcpy(dev->parent_priv, parent_priv, size); 182 } 183 184 ret = device_probe(dev->parent); 185 if (ret) 186 goto fail; 187 } 188 189 seq = uclass_resolve_seq(dev); 190 if (seq < 0) { 191 ret = seq; 192 goto fail; 193 } 194 dev->seq = seq; 195 196 if (dev->parent && dev->parent->driver->child_pre_probe) { 197 ret = dev->parent->driver->child_pre_probe(dev); 198 if (ret) 199 goto fail; 200 } 201 202 if (drv->ofdata_to_platdata && dev->of_offset >= 0) { 203 ret = drv->ofdata_to_platdata(dev); 204 if (ret) 205 goto fail; 206 } 207 208 if (drv->probe) { 209 ret = drv->probe(dev); 210 if (ret) 211 goto fail; 212 } 213 214 dev->flags |= DM_FLAG_ACTIVATED; 215 216 ret = uclass_post_probe_device(dev); 217 if (ret) { 218 dev->flags &= ~DM_FLAG_ACTIVATED; 219 goto fail_uclass; 220 } 221 222 return 0; 223 fail_uclass: 224 if (device_remove(dev)) { 225 dm_warn("%s: Device '%s' failed to remove on error path\n", 226 __func__, dev->name); 227 } 228 fail: 229 dev->seq = -1; 230 device_free(dev); 231 232 return ret; 233 } 234 235 int device_probe(struct udevice *dev) 236 { 237 return device_probe_child(dev, NULL); 238 } 239 240 void *dev_get_platdata(struct udevice *dev) 241 { 242 if (!dev) { 243 dm_warn("%s: null device\n", __func__); 244 return NULL; 245 } 246 247 return dev->platdata; 248 } 249 250 void *dev_get_priv(struct udevice *dev) 251 { 252 if (!dev) { 253 dm_warn("%s: null device\n", __func__); 254 return NULL; 255 } 256 257 return dev->priv; 258 } 259 260 void *dev_get_parentdata(struct udevice *dev) 261 { 262 if (!dev) { 263 dm_warn("%s: null device\n", __func__); 264 return NULL; 265 } 266 267 return dev->parent_priv; 268 } 269 270 static int device_get_device_tail(struct udevice *dev, int ret, 271 struct udevice **devp) 272 { 273 if (ret) 274 return ret; 275 276 ret = device_probe(dev); 277 if (ret) 278 return ret; 279 280 *devp = dev; 281 282 return 0; 283 } 284 285 int device_get_child(struct udevice *parent, int index, struct udevice **devp) 286 { 287 struct udevice *dev; 288 289 list_for_each_entry(dev, &parent->child_head, sibling_node) { 290 if (!index--) 291 return device_get_device_tail(dev, 0, devp); 292 } 293 294 return -ENODEV; 295 } 296 297 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq, 298 bool find_req_seq, struct udevice **devp) 299 { 300 struct udevice *dev; 301 302 *devp = NULL; 303 if (seq_or_req_seq == -1) 304 return -ENODEV; 305 306 list_for_each_entry(dev, &parent->child_head, sibling_node) { 307 if ((find_req_seq ? dev->req_seq : dev->seq) == 308 seq_or_req_seq) { 309 *devp = dev; 310 return 0; 311 } 312 } 313 314 return -ENODEV; 315 } 316 317 int device_get_child_by_seq(struct udevice *parent, int seq, 318 struct udevice **devp) 319 { 320 struct udevice *dev; 321 int ret; 322 323 *devp = NULL; 324 ret = device_find_child_by_seq(parent, seq, false, &dev); 325 if (ret == -ENODEV) { 326 /* 327 * We didn't find it in probed devices. See if there is one 328 * that will request this seq if probed. 329 */ 330 ret = device_find_child_by_seq(parent, seq, true, &dev); 331 } 332 return device_get_device_tail(dev, ret, devp); 333 } 334 335 int device_find_child_by_of_offset(struct udevice *parent, int of_offset, 336 struct udevice **devp) 337 { 338 struct udevice *dev; 339 340 *devp = NULL; 341 342 list_for_each_entry(dev, &parent->child_head, sibling_node) { 343 if (dev->of_offset == of_offset) { 344 *devp = dev; 345 return 0; 346 } 347 } 348 349 return -ENODEV; 350 } 351 352 int device_get_child_by_of_offset(struct udevice *parent, int seq, 353 struct udevice **devp) 354 { 355 struct udevice *dev; 356 int ret; 357 358 *devp = NULL; 359 ret = device_find_child_by_of_offset(parent, seq, &dev); 360 return device_get_device_tail(dev, ret, devp); 361 } 362 363 int device_find_first_child(struct udevice *parent, struct udevice **devp) 364 { 365 if (list_empty(&parent->child_head)) { 366 *devp = NULL; 367 } else { 368 *devp = list_first_entry(&parent->child_head, struct udevice, 369 sibling_node); 370 } 371 372 return 0; 373 } 374 375 int device_find_next_child(struct udevice **devp) 376 { 377 struct udevice *dev = *devp; 378 struct udevice *parent = dev->parent; 379 380 if (list_is_last(&dev->sibling_node, &parent->child_head)) { 381 *devp = NULL; 382 } else { 383 *devp = list_entry(dev->sibling_node.next, struct udevice, 384 sibling_node); 385 } 386 387 return 0; 388 } 389 390 struct udevice *dev_get_parent(struct udevice *child) 391 { 392 return child->parent; 393 } 394 395 ulong dev_get_of_data(struct udevice *dev) 396 { 397 return dev->of_id->data; 398 } 399