drivers/core/lists.c

   1 /*
   2  * Copyright (c) 2013 Google, Inc
   3  *
   4  * (C) Copyright 2012
   5  * Marek Vasut <marex@denx.de>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <errno.h>
  12 #include <dm/device.h>
  13 #include <dm/device-internal.h>
  14 #include <dm/lists.h>
  15 #include <dm/platdata.h>
  16 #include <dm/uclass.h>
  17 #include <dm/util.h>
  18 #include <fdtdec.h>
  19 #include <linux/compiler.h>
  20
  21 struct driver *lists_driver_lookup_name(const char *name)
  22 {
  23         struct driver *drv =
  24                 ll_entry_start(struct driver, driver);
  25         const int n_ents = ll_entry_count(struct driver, driver);
  26         struct driver *entry;
  27
  28         for (entry = drv; entry != drv + n_ents; entry++) {
  29                 if (!strcmp(name, entry->name))
  30                         return entry;
  31         }
  32
  33         /* Not found */
  34         return NULL;
  35 }
  36
  37 struct uclass_driver *lists_uclass_lookup(enum uclass_id id)
  38 {
  39         struct uclass_driver *uclass =
  40                 ll_entry_start(struct uclass_driver, uclass);
  41         const int n_ents = ll_entry_count(struct uclass_driver, uclass);
  42         struct uclass_driver *entry;
  43
  44         for (entry = uclass; entry != uclass + n_ents; entry++) {
  45                 if (entry->id == id)
  46                         return entry;
  47         }
  48
  49         return NULL;
  50 }
  51
  52 int lists_bind_drivers(struct udevice *parent, bool pre_reloc_only)
  53 {
  54         struct driver_info *info =
  55                 ll_entry_start(struct driver_info, driver_info);
  56         const int n_ents = ll_entry_count(struct driver_info, driver_info);
  57         struct driver_info *entry;
  58         struct udevice *dev;
  59         int result = 0;
  60         int ret;
  61
  62         for (entry = info; entry != info + n_ents; entry++) {
  63                 ret = device_bind_by_name(parent, pre_reloc_only, entry, &dev);
  64                 if (ret && ret != -EPERM) {
  65                         dm_warn("No match for driver '%s'\n", entry->name);
  66                         if (!result || ret != -ENOENT)
  67                                 result = ret;
  68                 }
  69         }
  70
  71         return result;
  72 }
  73
  74 int device_bind_driver(struct udevice *parent, const char *drv_name,
  75                        const char *dev_name, struct udevice **devp)
  76 {
  77         struct driver *drv;
  78         int ret;
  79
  80         drv = lists_driver_lookup_name(drv_name);
  81         if (!drv) {
  82                 printf("Cannot find driver '%s'\n", drv_name);
  83                 return -ENOENT;
  84         }
  85         ret = device_bind(parent, drv, dev_name, NULL, -1, devp);
  86         if (ret) {
  87                 printf("Cannot create device named '%s' (err=%d)\n",
  88                        dev_name, ret);
  89                 return ret;
  90         }
  91
  92         return 0;
  93 }
  94
  95 #ifdef CONFIG_OF_CONTROL
  96 /**
  97  * driver_check_compatible() - Check if a driver is compatible with this node
  98  *
  99  * @param blob:         Device tree pointer
 100  * @param offset:       Offset of node in device tree
 101  * @param of_match:     List of compatible strings to match
 102  * @param of_idp:       Returns the match that was found
 103  * @return 0 if there is a match, -ENOENT if no match, -ENODEV if the node
 104  * does not have a compatible string, other error <0 if there is a device
 105  * tree error
 106  */
 107 static int driver_check_compatible(const void *blob, int offset,
 108                                    const struct udevice_id *of_match,
 109                                    const struct udevice_id **of_idp)
 110 {
 111         int ret;
 112
 113         *of_idp = NULL;
 114         if (!of_match)
 115                 return -ENOENT;
 116
 117         while (of_match->compatible) {
 118                 ret = fdt_node_check_compatible(blob, offset,
 119                                                 of_match->compatible);
 120                 if (!ret) {
 121                         *of_idp = of_match;
 122                         return 0;
 123                 } else if (ret == -FDT_ERR_NOTFOUND) {
 124                         return -ENODEV;
 125                 } else if (ret < 0) {
 126                         return -EINVAL;
 127                 }
 128                 of_match++;
 129         }
 130
 131         return -ENOENT;
 132 }
 133
 134 int lists_bind_fdt(struct udevice *parent, const void *blob, int offset,
 135                    struct udevice **devp)
 136 {
 137         struct driver *driver = ll_entry_start(struct driver, driver);
 138         const int n_ents = ll_entry_count(struct driver, driver);
 139         const struct udevice_id *id;
 140         struct driver *entry;
 141         struct udevice *dev;
 142         bool found = false;
 143         const char *name;
 144         int result = 0;
 145         int ret = 0;
 146
 147         dm_dbg("bind node %s\n", fdt_get_name(blob, offset, NULL));
 148         if (devp)
 149                 *devp = NULL;
 150         for (entry = driver; entry != driver + n_ents; entry++) {
 151                 ret = driver_check_compatible(blob, offset, entry->of_match,
 152                                               &id);
 153                 name = fdt_get_name(blob, offset, NULL);
 154                 if (ret == -ENOENT) {
 155                         continue;
 156                 } else if (ret == -ENODEV) {
 157                         dm_dbg("Device '%s' has no compatible string\n", name);
 158                         break;
 159                 } else if (ret) {
 160                         dm_warn("Device tree error at offset %d\n", offset);
 161                         result = ret;
 162                         break;
 163                 }
 164
 165                 dm_dbg("   - found match at '%s'\n", entry->name);
 166                 ret = device_bind(parent, entry, name, NULL, offset, &dev);
 167                 if (ret) {
 168                         dm_warn("Error binding driver '%s'\n", entry->name);
 169                         return ret;
 170                 } else {
 171                         dev->driver_data = id->data;
 172                         found = true;
 173                         if (devp)
 174                                 *devp = dev;
 175                 }
 176                 break;
 177         }
 178
 179         if (!found && !result && ret != -ENODEV) {
 180                 dm_dbg("No match for node '%s'\n",
 181                        fdt_get_name(blob, offset, NULL));
 182         }
 183
 184         return result;
 185 }
 186 #endif