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 return device_bind_driver_to_node(parent, drv_name, dev_name, -1, devp); 78 } 79 80 int device_bind_driver_to_node(struct udevice *parent, const char *drv_name, 81 const char *dev_name, int node, 82 struct udevice **devp) 83 { 84 struct driver *drv; 85 int ret; 86 87 drv = lists_driver_lookup_name(drv_name); 88 if (!drv) { 89 debug("Cannot find driver '%s'\n", drv_name); 90 return -ENOENT; 91 } 92 ret = device_bind(parent, drv, dev_name, NULL, node, devp); 93 if (ret) { 94 debug("Cannot create device named '%s' (err=%d)\n", 95 dev_name, ret); 96 return ret; 97 } 98 99 return 0; 100 } 101 102 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) 103 /** 104 * driver_check_compatible() - Check if a driver matches a compatible string 105 * 106 * @param of_match: List of compatible strings to match 107 * @param of_idp: Returns the match that was found 108 * @param compat: The compatible string to search for 109 * @return 0 if there is a match, -ENOENT if no match 110 */ 111 static int driver_check_compatible(const struct udevice_id *of_match, 112 const struct udevice_id **of_idp, 113 const char *compat) 114 { 115 if (!of_match) 116 return -ENOENT; 117 118 while (of_match->compatible) { 119 if (!strcmp(of_match->compatible, compat)) { 120 *of_idp = of_match; 121 return 0; 122 } 123 of_match++; 124 } 125 126 return -ENOENT; 127 } 128 129 int lists_bind_fdt(struct udevice *parent, const void *blob, int offset, 130 struct udevice **devp) 131 { 132 struct driver *driver = ll_entry_start(struct driver, driver); 133 const int n_ents = ll_entry_count(struct driver, driver); 134 const struct udevice_id *id; 135 struct driver *entry; 136 struct udevice *dev; 137 bool found = false; 138 const char *name, *compat_list, *compat; 139 int compat_length, i; 140 int result = 0; 141 int ret = 0; 142 143 name = fdt_get_name(blob, offset, NULL); 144 dm_dbg("bind node %s\n", name); 145 if (devp) 146 *devp = NULL; 147 148 compat_list = fdt_getprop(blob, offset, "compatible", &compat_length); 149 if (!compat_list) { 150 if (compat_length == -FDT_ERR_NOTFOUND) { 151 dm_dbg("Device '%s' has no compatible string\n", name); 152 return 0; 153 } 154 155 dm_warn("Device tree error at offset %d\n", offset); 156 return compat_length; 157 } 158 159 /* 160 * Walk through the compatible string list, attempting to match each 161 * compatible string in order such that we match in order of priority 162 * from the first string to the last. 163 */ 164 for (i = 0; i < compat_length; i += strlen(compat) + 1) { 165 compat = compat_list + i; 166 dm_dbg(" - attempt to match compatible string '%s'\n", 167 compat); 168 169 for (entry = driver; entry != driver + n_ents; entry++) { 170 ret = driver_check_compatible(entry->of_match, &id, 171 compat); 172 if (!ret) 173 break; 174 } 175 if (entry == driver + n_ents) 176 continue; 177 178 dm_dbg(" - found match at '%s'\n", entry->name); 179 ret = device_bind_with_driver_data(parent, entry, name, 180 id->data, offset, &dev); 181 if (ret == -ENODEV) { 182 dm_dbg("Driver '%s' refuses to bind\n", entry->name); 183 continue; 184 } 185 if (ret) { 186 dm_warn("Error binding driver '%s': %d\n", entry->name, 187 ret); 188 return ret; 189 } else { 190 found = true; 191 if (devp) 192 *devp = dev; 193 } 194 break; 195 } 196 197 if (!found && !result && ret != -ENODEV) 198 dm_dbg("No match for node '%s'\n", name); 199 200 return result; 201 } 202 #endif 203