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 187