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) 103 /** 104 * driver_check_compatible() - Check if a driver is compatible with this node 105 * 106 * @param blob: Device tree pointer 107 * @param offset: Offset of node in device tree 108 * @param of_match: List of compatible strings to match 109 * @param of_idp: Returns the match that was found 110 * @return 0 if there is a match, -ENOENT if no match, -ENODEV if the node 111 * does not have a compatible string, other error <0 if there is a device 112 * tree error 113 */ 114 static int driver_check_compatible(const void *blob, int offset, 115 const struct udevice_id *of_match, 116 const struct udevice_id **of_idp) 117 { 118 int ret; 119 120 *of_idp = NULL; 121 if (!of_match) 122 return -ENOENT; 123 124 while (of_match->compatible) { 125 ret = fdt_node_check_compatible(blob, offset, 126 of_match->compatible); 127 if (!ret) { 128 *of_idp = of_match; 129 return 0; 130 } else if (ret == -FDT_ERR_NOTFOUND) { 131 return -ENODEV; 132 } else if (ret < 0) { 133 return -EINVAL; 134 } 135 of_match++; 136 } 137 138 return -ENOENT; 139 } 140 141 int lists_bind_fdt(struct udevice *parent, const void *blob, int offset, 142 struct udevice **devp) 143 { 144 struct driver *driver = ll_entry_start(struct driver, driver); 145 const int n_ents = ll_entry_count(struct driver, driver); 146 const struct udevice_id *id; 147 struct driver *entry; 148 struct udevice *dev; 149 bool found = false; 150 const char *name; 151 int result = 0; 152 int ret = 0; 153 154 dm_dbg("bind node %s\n", fdt_get_name(blob, offset, NULL)); 155 if (devp) 156 *devp = NULL; 157 for (entry = driver; entry != driver + n_ents; entry++) { 158 ret = driver_check_compatible(blob, offset, entry->of_match, 159 &id); 160 name = fdt_get_name(blob, offset, NULL); 161 if (ret == -ENOENT) { 162 continue; 163 } else if (ret == -ENODEV) { 164 dm_dbg("Device '%s' has no compatible string\n", name); 165 break; 166 } else if (ret) { 167 dm_warn("Device tree error at offset %d\n", offset); 168 result = ret; 169 break; 170 } 171 172 dm_dbg(" - found match at '%s'\n", entry->name); 173 ret = device_bind_with_driver_data(parent, entry, name, 174 id->data, offset, &dev); 175 if (ret == -ENODEV) { 176 dm_dbg("Driver '%s' refuses to bind\n", entry->name); 177 continue; 178 } 179 if (ret) { 180 dm_warn("Error binding driver '%s': %d\n", entry->name, 181 ret); 182 return ret; 183 } else { 184 found = true; 185 if (devp) 186 *devp = dev; 187 } 188 break; 189 } 190 191 if (!found && !result && ret != -ENODEV) { 192 dm_dbg("No match for node '%s'\n", 193 fdt_get_name(blob, offset, NULL)); 194 } 195 196 return result; 197 } 198 #endif 199