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 if (!drv || !n_ents) 29 return NULL; 30 31 for (entry = drv; entry != drv + n_ents; entry++) { 32 if (!strcmp(name, entry->name)) 33 return entry; 34 } 35 36 /* Not found */ 37 return NULL; 38 } 39 40 struct uclass_driver *lists_uclass_lookup(enum uclass_id id) 41 { 42 struct uclass_driver *uclass = 43 ll_entry_start(struct uclass_driver, uclass); 44 const int n_ents = ll_entry_count(struct uclass_driver, uclass); 45 struct uclass_driver *entry; 46 47 if ((id == UCLASS_INVALID) || !uclass) 48 return NULL; 49 50 for (entry = uclass; entry != uclass + n_ents; entry++) { 51 if (entry->id == id) 52 return entry; 53 } 54 55 return NULL; 56 } 57 58 int lists_bind_drivers(struct udevice *parent, bool pre_reloc_only) 59 { 60 struct driver_info *info = 61 ll_entry_start(struct driver_info, driver_info); 62 const int n_ents = ll_entry_count(struct driver_info, driver_info); 63 struct driver_info *entry; 64 struct udevice *dev; 65 int result = 0; 66 int ret; 67 68 for (entry = info; entry != info + n_ents; entry++) { 69 ret = device_bind_by_name(parent, pre_reloc_only, entry, &dev); 70 if (ret && ret != -EPERM) { 71 dm_warn("No match for driver '%s'\n", entry->name); 72 if (!result || ret != -ENOENT) 73 result = ret; 74 } 75 } 76 77 return result; 78 } 79 80 #ifdef CONFIG_OF_CONTROL 81 /** 82 * driver_check_compatible() - Check if a driver is compatible with this node 83 * 84 * @param blob: Device tree pointer 85 * @param offset: Offset of node in device tree 86 * @param of_match: List of compatible strings to match 87 * @param of_idp: Returns the match that was found 88 * @return 0 if there is a match, -ENOENT if no match, -ENODEV if the node 89 * does not have a compatible string, other error <0 if there is a device 90 * tree error 91 */ 92 static int driver_check_compatible(const void *blob, int offset, 93 const struct udevice_id *of_match, 94 const struct udevice_id **of_idp) 95 { 96 int ret; 97 98 *of_idp = NULL; 99 if (!of_match) 100 return -ENOENT; 101 102 while (of_match->compatible) { 103 ret = fdt_node_check_compatible(blob, offset, 104 of_match->compatible); 105 if (!ret) { 106 *of_idp = of_match; 107 return 0; 108 } else if (ret == -FDT_ERR_NOTFOUND) { 109 return -ENODEV; 110 } else if (ret < 0) { 111 return -EINVAL; 112 } 113 of_match++; 114 } 115 116 return -ENOENT; 117 } 118 119 int lists_bind_fdt(struct udevice *parent, const void *blob, int offset, 120 struct udevice **devp) 121 { 122 struct driver *driver = ll_entry_start(struct driver, driver); 123 const int n_ents = ll_entry_count(struct driver, driver); 124 const struct udevice_id *id; 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 if (devp) 134 *devp = NULL; 135 for (entry = driver; entry != driver + n_ents; entry++) { 136 ret = driver_check_compatible(blob, offset, entry->of_match, 137 &id); 138 name = fdt_get_name(blob, offset, NULL); 139 if (ret == -ENOENT) { 140 continue; 141 } else if (ret == -ENODEV) { 142 dm_dbg("Device '%s' has no compatible string\n", name); 143 break; 144 } else if (ret) { 145 dm_warn("Device tree error at offset %d\n", offset); 146 if (!result || ret != -ENOENT) 147 result = ret; 148 break; 149 } 150 151 dm_dbg(" - found match at '%s'\n", entry->name); 152 ret = device_bind(parent, entry, name, NULL, offset, &dev); 153 if (ret) { 154 dm_warn("Error binding driver '%s'\n", entry->name); 155 return ret; 156 } else { 157 dev->of_id = id; 158 found = true; 159 if (devp) 160 *devp = dev; 161 } 162 break; 163 } 164 165 if (!found && !result && ret != -ENODEV) { 166 dm_dbg("No match for node '%s'\n", 167 fdt_get_name(blob, offset, NULL)); 168 } 169 170 return result; 171 } 172 #endif 173