drivers/core/root.c

   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 void dm_fixup_for_gd_move(struct global_data *new_gd)
  45 {
  46         /* The sentinel node has moved, so update things that point to it */
  47         new_gd->uclass_root.next->prev = &new_gd->uclass_root;
  48         new_gd->uclass_root.prev->next = &new_gd->uclass_root;
  49 }
  50
  51 fdt_addr_t dm_get_translation_offset(void)
  52 {
  53         struct udevice *root = dm_root();
  54         struct root_priv *priv = dev_get_priv(root);
  55
  56         return priv->translation_offset;
  57 }
  58
  59 void dm_set_translation_offset(fdt_addr_t offs)
  60 {
  61         struct udevice *root = dm_root();
  62         struct root_priv *priv = dev_get_priv(root);
  63
  64         priv->translation_offset = offs;
  65 }
  66
  67 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
  68 void fix_drivers(void)
  69 {
  70         struct driver *drv =
  71                 ll_entry_start(struct driver, driver);
  72         const int n_ents = ll_entry_count(struct driver, driver);
  73         struct driver *entry;
  74
  75         for (entry = drv; entry != drv + n_ents; entry++) {
  76                 if (entry->of_match)
  77                         entry->of_match = (const struct udevice_id *)
  78                                 ((u32)entry->of_match + gd->reloc_off);
  79                 if (entry->bind)
  80                         entry->bind += gd->reloc_off;
  81                 if (entry->probe)
  82                         entry->probe += gd->reloc_off;
  83                 if (entry->remove)
  84                         entry->remove += gd->reloc_off;
  85                 if (entry->unbind)
  86                         entry->unbind += gd->reloc_off;
  87                 if (entry->ofdata_to_platdata)
  88                         entry->ofdata_to_platdata += gd->reloc_off;
  89                 if (entry->child_post_bind)
  90                         entry->child_post_bind += gd->reloc_off;
  91                 if (entry->child_pre_probe)
  92                         entry->child_pre_probe += gd->reloc_off;
  93                 if (entry->child_post_remove)
  94                         entry->child_post_remove += gd->reloc_off;
  95                 /* OPS are fixed in every uclass post_probe function */
  96                 if (entry->ops)
  97                         entry->ops += gd->reloc_off;
  98         }
  99 }
 100
 101 void fix_uclass(void)
 102 {
 103         struct uclass_driver *uclass =
 104                 ll_entry_start(struct uclass_driver, uclass);
 105         const int n_ents = ll_entry_count(struct uclass_driver, uclass);
 106         struct uclass_driver *entry;
 107
 108         for (entry = uclass; entry != uclass + n_ents; entry++) {
 109                 if (entry->post_bind)
 110                         entry->post_bind += gd->reloc_off;
 111                 if (entry->pre_unbind)
 112                         entry->pre_unbind += gd->reloc_off;
 113                 if (entry->pre_probe)
 114                         entry->pre_probe += gd->reloc_off;
 115                 if (entry->post_probe)
 116                         entry->post_probe += gd->reloc_off;
 117                 if (entry->pre_remove)
 118                         entry->pre_remove += gd->reloc_off;
 119                 if (entry->child_post_bind)
 120                         entry->child_post_bind += gd->reloc_off;
 121                 if (entry->child_pre_probe)
 122                         entry->child_pre_probe += gd->reloc_off;
 123                 if (entry->init)
 124                         entry->init += gd->reloc_off;
 125                 if (entry->destroy)
 126                         entry->destroy += gd->reloc_off;
 127                 /* FIXME maybe also need to fix these ops */
 128                 if (entry->ops)
 129                         entry->ops += gd->reloc_off;
 130         }
 131 }
 132
 133 void fix_devices(void)
 134 {
 135         struct driver_info *dev =
 136                 ll_entry_start(struct driver_info, driver_info);
 137         const int n_ents = ll_entry_count(struct driver_info, driver_info);
 138         struct driver_info *entry;
 139
 140         for (entry = dev; entry != dev + n_ents; entry++) {
 141                 if (entry->platdata)
 142                         entry->platdata += gd->reloc_off;
 143         }
 144 }
 145
 146 #endif
 147
 148 int dm_init(void)
 149 {
 150         int ret;
 151
 152         if (gd->dm_root) {
 153                 dm_warn("Virtual root driver already exists!\n");
 154                 return -EINVAL;
 155         }
 156         INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
 157
 158 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 159         fix_drivers();
 160         fix_uclass();
 161         fix_devices();
 162 #endif
 163
 164         ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
 165         if (ret)
 166                 return ret;
 167 #if CONFIG_IS_ENABLED(OF_CONTROL)
 168         DM_ROOT_NON_CONST->of_offset = 0;
 169 #endif
 170         ret = device_probe(DM_ROOT_NON_CONST);
 171         if (ret)
 172                 return ret;
 173
 174         return 0;
 175 }
 176
 177 int dm_uninit(void)
 178 {
 179         device_remove(dm_root());
 180         device_unbind(dm_root());
 181
 182         return 0;
 183 }
 184
 185 int dm_scan_platdata(bool pre_reloc_only)
 186 {
 187         int ret;
 188
 189         ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
 190         if (ret == -ENOENT) {
 191                 dm_warn("Some drivers were not found\n");
 192                 ret = 0;
 193         }
 194
 195         return ret;
 196 }
 197
 198 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 199 int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
 200                      bool pre_reloc_only)
 201 {
 202         int ret = 0, err;
 203
 204         for (offset = fdt_first_subnode(blob, offset);
 205              offset > 0;
 206              offset = fdt_next_subnode(blob, offset)) {
 207                 if (pre_reloc_only &&
 208                     !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL))
 209                         continue;
 210                 if (!fdtdec_get_is_enabled(blob, offset)) {
 211                         dm_dbg("   - ignoring disabled device\n");
 212                         continue;
 213                 }
 214                 err = lists_bind_fdt(parent, blob, offset, NULL);
 215                 if (err && !ret) {
 216                         ret = err;
 217                         debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
 218                               ret);
 219                 }
 220         }
 221
 222         if (ret)
 223                 dm_warn("Some drivers failed to bind\n");
 224
 225         return ret;
 226 }
 227
 228 int dm_scan_fdt_dev(struct udevice *dev)
 229 {
 230         if (dev->of_offset == -1)
 231                 return 0;
 232
 233         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset,
 234                                 gd->flags & GD_FLG_RELOC ? false : true);
 235 }
 236
 237 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
 238 {
 239         return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
 240 }
 241 #endif
 242
 243 __weak int dm_scan_other(bool pre_reloc_only)
 244 {
 245         return 0;
 246 }
 247
 248 int dm_init_and_scan(bool pre_reloc_only)
 249 {
 250         int ret;
 251
 252         ret = dm_init();
 253         if (ret) {
 254                 debug("dm_init() failed: %d\n", ret);
 255                 return ret;
 256         }
 257         ret = dm_scan_platdata(pre_reloc_only);
 258         if (ret) {
 259                 debug("dm_scan_platdata() failed: %d\n", ret);
 260                 return ret;
 261         }
 262
 263         if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
 264                 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
 265                 if (ret) {
 266                         debug("dm_scan_fdt() failed: %d\n", ret);
 267                         return ret;
 268                 }
 269         }
 270
 271         ret = dm_scan_other(pre_reloc_only);
 272         if (ret)
 273                 return ret;
 274
 275         return 0;
 276 }
 277
 278 /* This is the root driver - all drivers are children of this */
 279 U_BOOT_DRIVER(root_driver) = {
 280         .name   = "root_driver",
 281         .id     = UCLASS_ROOT,
 282         .priv_auto_alloc_size = sizeof(struct root_priv),
 283 };
 284
 285 /* This is the root uclass */
 286 UCLASS_DRIVER(root) = {
 287         .name   = "root",
 288         .id     = UCLASS_ROOT,
 289 };