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 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 };