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 static const struct driver_info root_info = {
  27         .name           = "root_driver",
  28 };
  29
  30 struct udevice *dm_root(void)
  31 {
  32         if (!gd->dm_root) {
  33                 dm_warn("Virtual root driver does not exist!\n");
  34                 return NULL;
  35         }
  36
  37         return gd->dm_root;
  38 }
  39
  40 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
  41 void fix_drivers(void)
  42 {
  43         struct driver *drv =
  44                 ll_entry_start(struct driver, driver);
  45         const int n_ents = ll_entry_count(struct driver, driver);
  46         struct driver *entry;
  47
  48         for (entry = drv; entry != drv + n_ents; entry++) {
  49                 if (entry->of_match)
  50                         entry->of_match = (const struct udevice_id *)
  51                                 ((u32)entry->of_match + gd->reloc_off);
  52                 if (entry->bind)
  53                         entry->bind += gd->reloc_off;
  54                 if (entry->probe)
  55                         entry->probe += gd->reloc_off;
  56                 if (entry->remove)
  57                         entry->remove += gd->reloc_off;
  58                 if (entry->unbind)
  59                         entry->unbind += gd->reloc_off;
  60                 if (entry->ofdata_to_platdata)
  61                         entry->ofdata_to_platdata += gd->reloc_off;
  62                 if (entry->child_post_bind)
  63                         entry->child_post_bind += gd->reloc_off;
  64                 if (entry->child_pre_probe)
  65                         entry->child_pre_probe += gd->reloc_off;
  66                 if (entry->child_post_remove)
  67                         entry->child_post_remove += gd->reloc_off;
  68                 /* OPS are fixed in every uclass post_probe function */
  69                 if (entry->ops)
  70                         entry->ops += gd->reloc_off;
  71         }
  72 }
  73
  74 void fix_uclass(void)
  75 {
  76         struct uclass_driver *uclass =
  77                 ll_entry_start(struct uclass_driver, uclass);
  78         const int n_ents = ll_entry_count(struct uclass_driver, uclass);
  79         struct uclass_driver *entry;
  80
  81         for (entry = uclass; entry != uclass + n_ents; entry++) {
  82                 if (entry->post_bind)
  83                         entry->post_bind += gd->reloc_off;
  84                 if (entry->pre_unbind)
  85                         entry->pre_unbind += gd->reloc_off;
  86                 if (entry->pre_probe)
  87                         entry->pre_probe += gd->reloc_off;
  88                 if (entry->post_probe)
  89                         entry->post_probe += gd->reloc_off;
  90                 if (entry->pre_remove)
  91                         entry->pre_remove += gd->reloc_off;
  92                 if (entry->child_post_bind)
  93                         entry->child_post_bind += gd->reloc_off;
  94                 if (entry->child_pre_probe)
  95                         entry->child_pre_probe += gd->reloc_off;
  96                 if (entry->init)
  97                         entry->init += gd->reloc_off;
  98                 if (entry->destroy)
  99                         entry->destroy += gd->reloc_off;
 100                 /* FIXME maybe also need to fix these ops */
 101                 if (entry->ops)
 102                         entry->ops += gd->reloc_off;
 103         }
 104 }
 105 #endif
 106
 107 int dm_init(void)
 108 {
 109         int ret;
 110
 111         if (gd->dm_root) {
 112                 dm_warn("Virtual root driver already exists!\n");
 113                 return -EINVAL;
 114         }
 115         INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
 116
 117 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 118         fix_drivers();
 119         fix_uclass();
 120 #endif
 121
 122         ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
 123         if (ret)
 124                 return ret;
 125 #if CONFIG_IS_ENABLED(OF_CONTROL)
 126         DM_ROOT_NON_CONST->of_offset = 0;
 127 #endif
 128         ret = device_probe(DM_ROOT_NON_CONST);
 129         if (ret)
 130                 return ret;
 131
 132         return 0;
 133 }
 134
 135 int dm_uninit(void)
 136 {
 137         device_remove(dm_root());
 138         device_unbind(dm_root());
 139
 140         return 0;
 141 }
 142
 143 int dm_scan_platdata(bool pre_reloc_only)
 144 {
 145         int ret;
 146
 147         ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
 148         if (ret == -ENOENT) {
 149                 dm_warn("Some drivers were not found\n");
 150                 ret = 0;
 151         }
 152
 153         return ret;
 154 }
 155
 156 #if CONFIG_IS_ENABLED(OF_CONTROL)
 157 int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
 158                      bool pre_reloc_only)
 159 {
 160         int ret = 0, err;
 161
 162         for (offset = fdt_first_subnode(blob, offset);
 163              offset > 0;
 164              offset = fdt_next_subnode(blob, offset)) {
 165                 if (pre_reloc_only &&
 166                     !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL))
 167                         continue;
 168                 if (!fdtdec_get_is_enabled(blob, offset)) {
 169                         dm_dbg("   - ignoring disabled device\n");
 170                         continue;
 171                 }
 172                 err = lists_bind_fdt(parent, blob, offset, NULL);
 173                 if (err && !ret) {
 174                         ret = err;
 175                         debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
 176                               ret);
 177                 }
 178         }
 179
 180         if (ret)
 181                 dm_warn("Some drivers failed to bind\n");
 182
 183         return ret;
 184 }
 185
 186 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
 187 {
 188         return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
 189 }
 190 #endif
 191
 192 __weak int dm_scan_other(bool pre_reloc_only)
 193 {
 194         return 0;
 195 }
 196
 197 int dm_init_and_scan(bool pre_reloc_only)
 198 {
 199         int ret;
 200
 201         ret = dm_init();
 202         if (ret) {
 203                 debug("dm_init() failed: %d\n", ret);
 204                 return ret;
 205         }
 206         ret = dm_scan_platdata(pre_reloc_only);
 207         if (ret) {
 208                 debug("dm_scan_platdata() failed: %d\n", ret);
 209                 return ret;
 210         }
 211
 212         if (CONFIG_IS_ENABLED(OF_CONTROL)) {
 213                 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
 214                 if (ret) {
 215                         debug("dm_scan_fdt() failed: %d\n", ret);
 216                         return ret;
 217                 }
 218         }
 219
 220         ret = dm_scan_other(pre_reloc_only);
 221         if (ret)
 222                 return ret;
 223
 224         return 0;
 225 }
 226
 227 /* This is the root driver - all drivers are children of this */
 228 U_BOOT_DRIVER(root_driver) = {
 229         .name   = "root_driver",
 230         .id     = UCLASS_ROOT,
 231 };
 232
 233 /* This is the root uclass */
 234 UCLASS_DRIVER(root) = {
 235         .name   = "root",
 236         .id     = UCLASS_ROOT,
 237 };