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