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_matchL List of compatible strings to match 87 * @return 0 if there is a match, -ENOENT if no match, -ENODEV if the node 88 * does not have a compatible string, other error <0 if there is a device 89 * tree error 90 */ 91 static int driver_check_compatible(const void *blob, int offset, 92 const struct udevice_id *of_match) 93 { 94 int ret; 95 96 if (!of_match) 97 return -ENOENT; 98 99 while (of_match->compatible) { 100 ret = fdt_node_check_compatible(blob, offset, 101 of_match->compatible); 102 if (!ret) 103 return 0; 104 else if (ret == -FDT_ERR_NOTFOUND) 105 return -ENODEV; 106 else if (ret < 0) 107 return -EINVAL; 108 of_match++; 109 } 110 111 return -ENOENT; 112 } 113 114 int lists_bind_fdt(struct udevice *parent, const void *blob, int offset, 115 struct udevice **devp) 116 { 117 struct driver *driver = ll_entry_start(struct driver, driver); 118 const int n_ents = ll_entry_count(struct driver, driver); 119 struct driver *entry; 120 struct udevice *dev; 121 bool found = false; 122 const char *name; 123 int result = 0; 124 int ret = 0; 125 126 dm_dbg("bind node %s\n", fdt_get_name(blob, offset, NULL)); 127 if (devp) 128 *devp = NULL; 129 for (entry = driver; entry != driver + n_ents; entry++) { 130 ret = driver_check_compatible(blob, offset, entry->of_match); 131 name = fdt_get_name(blob, offset, NULL); 132 if (ret == -ENOENT) { 133 continue; 134 } else if (ret == -ENODEV) { 135 dm_dbg("Device '%s' has no compatible string\n", name); 136 break; 137 } else if (ret) { 138 dm_warn("Device tree error at offset %d\n", offset); 139 if (!result || ret != -ENOENT) 140 result = ret; 141 break; 142 } 143 144 dm_dbg(" - found match at '%s'\n", entry->name); 145 ret = device_bind(parent, entry, name, NULL, offset, &dev); 146 if (ret) { 147 dm_warn("Error binding driver '%s'\n", entry->name); 148 return ret; 149 } else { 150 found = true; 151 if (devp) 152 *devp = dev; 153 } 154 break; 155 } 156 157 if (!found && !result && ret != -ENODEV) { 158 dm_dbg("No match for node '%s'\n", 159 fdt_get_name(blob, offset, NULL)); 160 } 161 162 return result; 163 } 164 #endif 165