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         int len;
  28
  29         if (!drv || !n_ents)
  30                 return NULL;
  31
  32         len = strlen(name);
  33
  34         for (entry = drv; entry != drv + n_ents; entry++) {
  35                 if (strncmp(name, entry->name, len))
  36                         continue;
  37
  38                 /* Full match */
  39                 if (len == strlen(entry->name))
  40                         return entry;
  41         }
  42
  43         /* Not found */
  44         return NULL;
  45 }
  46
  47 struct uclass_driver *lists_uclass_lookup(enum uclass_id id)
  48 {
  49         struct uclass_driver *uclass =
  50                 ll_entry_start(struct uclass_driver, uclass);
  51         const int n_ents = ll_entry_count(struct uclass_driver, uclass);
  52         struct uclass_driver *entry;
  53
  54         if ((id == UCLASS_INVALID) || !uclass)
  55                 return NULL;
  56
  57         for (entry = uclass; entry != uclass + n_ents; entry++) {
  58                 if (entry->id == id)
  59                         return entry;
  60         }
  61
  62         return NULL;
  63 }
  64
  65 int lists_bind_drivers(struct udevice *parent, bool pre_reloc_only)
  66 {
  67         struct driver_info *info =
  68                 ll_entry_start(struct driver_info, driver_info);
  69         const int n_ents = ll_entry_count(struct driver_info, driver_info);
  70         struct driver_info *entry;
  71         struct udevice *dev;
  72         int result = 0;
  73         int ret;
  74
  75         for (entry = info; entry != info + n_ents; entry++) {
  76                 ret = device_bind_by_name(parent, pre_reloc_only, entry, &dev);
  77                 if (ret && ret != -EPERM) {
  78                         dm_warn("No match for driver '%s'\n", entry->name);
  79                         if (!result || ret != -ENOENT)
  80                                 result = ret;
  81                 }
  82         }
  83
  84         return result;
  85 }
  86
  87 #ifdef CONFIG_OF_CONTROL
  88 /**
  89  * driver_check_compatible() - Check if a driver is compatible with this node
  90  *
  91  * @param blob:         Device tree pointer
  92  * @param offset:       Offset of node in device tree
  93  * @param of_matchL     List of compatible strings to match
  94  * @return 0 if there is a match, -ENOENT if no match, -ENODEV if the node
  95  * does not have a compatible string, other error <0 if there is a device
  96  * tree error
  97  */
  98 static int driver_check_compatible(const void *blob, int offset,
  99                                    const struct udevice_id *of_match)
 100 {
 101         int ret;
 102
 103         if (!of_match)
 104                 return -ENOENT;
 105
 106         while (of_match->compatible) {
 107                 ret = fdt_node_check_compatible(blob, offset,
 108                                                 of_match->compatible);
 109                 if (!ret)
 110                         return 0;
 111                 else if (ret == -FDT_ERR_NOTFOUND)
 112                         return -ENODEV;
 113                 else if (ret < 0)
 114                         return -EINVAL;
 115                 of_match++;
 116         }
 117
 118         return -ENOENT;
 119 }
 120
 121 int lists_bind_fdt(struct udevice *parent, const void *blob, int offset)
 122 {
 123         struct driver *driver = ll_entry_start(struct driver, driver);
 124         const int n_ents = ll_entry_count(struct driver, driver);
 125         struct driver *entry;
 126         struct udevice *dev;
 127         bool found = false;
 128         const char *name;
 129         int result = 0;
 130         int ret = 0;
 131
 132         dm_dbg("bind node %s\n", fdt_get_name(blob, offset, NULL));
 133         for (entry = driver; entry != driver + n_ents; entry++) {
 134                 ret = driver_check_compatible(blob, offset, entry->of_match);
 135                 name = fdt_get_name(blob, offset, NULL);
 136                 if (ret == -ENOENT) {
 137                         continue;
 138                 } else if (ret == -ENODEV) {
 139                         dm_dbg("Device '%s' has no compatible string\n", name);
 140                         break;
 141                 } else if (ret) {
 142                         dm_warn("Device tree error at offset %d\n", offset);
 143                         if (!result || ret != -ENOENT)
 144                                 result = ret;
 145                         break;
 146                 }
 147
 148                 dm_dbg("   - found match at '%s'\n", entry->name);
 149                 ret = device_bind(parent, entry, name, NULL, offset, &dev);
 150                 if (ret) {
 151                         dm_warn("Error binding driver '%s'\n", entry->name);
 152                         if (!result || ret != -ENOENT)
 153                                 result = ret;
 154                 } else {
 155                         found = true;
 156                 }
 157                 break;
 158         }
 159
 160         if (!found && !result && ret != -ENODEV) {
 161                 dm_dbg("No match for node '%s'\n",
 162                        fdt_get_name(blob, offset, NULL));
 163         }
 164
 165         return result;
 166 }
 167 #endif