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