Michal Simek | 12e8414 | 2009-03-27 14:25:12 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. |
| 3 | * <benh@kernel.crashing.org> |
| 4 | * and Arnd Bergmann, IBM Corp. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #undef DEBUG |
| 14 | |
| 15 | #include <linux/string.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/mod_devicetable.h> |
Michal Simek | 12e8414 | 2009-03-27 14:25:12 +0100 | [diff] [blame] | 20 | #include <linux/pci.h> |
| 21 | #include <linux/of.h> |
| 22 | #include <linux/of_device.h> |
| 23 | #include <linux/of_platform.h> |
| 24 | |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/topology.h> |
| 27 | #include <asm/atomic.h> |
| 28 | |
| 29 | struct bus_type of_platform_bus_type = { |
| 30 | .uevent = of_device_uevent, |
| 31 | }; |
| 32 | EXPORT_SYMBOL(of_platform_bus_type); |
| 33 | |
| 34 | static int __init of_bus_driver_init(void) |
| 35 | { |
| 36 | return of_bus_type_init(&of_platform_bus_type, "of_platform"); |
| 37 | } |
| 38 | postcore_initcall(of_bus_driver_init); |
| 39 | |
| 40 | struct of_device *of_platform_device_create(struct device_node *np, |
| 41 | const char *bus_id, |
| 42 | struct device *parent) |
| 43 | { |
| 44 | struct of_device *dev; |
| 45 | |
| 46 | dev = of_device_alloc(np, bus_id, parent); |
| 47 | if (!dev) |
| 48 | return NULL; |
| 49 | |
| 50 | dev->dma_mask = 0xffffffffUL; |
| 51 | dev->dev.bus = &of_platform_bus_type; |
| 52 | |
| 53 | /* We do not fill the DMA ops for platform devices by default. |
| 54 | * This is currently the responsibility of the platform code |
| 55 | * to do such, possibly using a device notifier |
| 56 | */ |
| 57 | |
| 58 | if (of_device_register(dev) != 0) { |
| 59 | of_device_free(dev); |
| 60 | return NULL; |
| 61 | } |
| 62 | |
| 63 | return dev; |
| 64 | } |
| 65 | EXPORT_SYMBOL(of_platform_device_create); |
| 66 | |
| 67 | /** |
| 68 | * of_platform_bus_create - Create an OF device for a bus node and all its |
| 69 | * children. Optionally recursively instanciate matching busses. |
| 70 | * @bus: device node of the bus to instanciate |
| 71 | * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to |
| 72 | * disallow recursive creation of child busses |
| 73 | */ |
| 74 | static int of_platform_bus_create(const struct device_node *bus, |
| 75 | const struct of_device_id *matches, |
| 76 | struct device *parent) |
| 77 | { |
| 78 | struct device_node *child; |
| 79 | struct of_device *dev; |
| 80 | int rc = 0; |
| 81 | |
| 82 | for_each_child_of_node(bus, child) { |
| 83 | pr_debug(" create child: %s\n", child->full_name); |
| 84 | dev = of_platform_device_create(child, NULL, parent); |
| 85 | if (dev == NULL) |
| 86 | rc = -ENOMEM; |
| 87 | else if (!of_match_node(matches, child)) |
| 88 | continue; |
| 89 | if (rc == 0) { |
| 90 | pr_debug(" and sub busses\n"); |
| 91 | rc = of_platform_bus_create(child, matches, &dev->dev); |
| 92 | } |
| 93 | if (rc) { |
| 94 | of_node_put(child); |
| 95 | break; |
| 96 | } |
| 97 | } |
| 98 | return rc; |
| 99 | } |
| 100 | |
| 101 | |
| 102 | /** |
| 103 | * of_platform_bus_probe - Probe the device-tree for platform busses |
| 104 | * @root: parent of the first level to probe or NULL for the root of the tree |
| 105 | * @matches: match table, NULL to use the default |
| 106 | * @parent: parent to hook devices from, NULL for toplevel |
| 107 | * |
| 108 | * Note that children of the provided root are not instanciated as devices |
| 109 | * unless the specified root itself matches the bus list and is not NULL. |
| 110 | */ |
| 111 | |
| 112 | int of_platform_bus_probe(struct device_node *root, |
| 113 | const struct of_device_id *matches, |
| 114 | struct device *parent) |
| 115 | { |
| 116 | struct device_node *child; |
| 117 | struct of_device *dev; |
| 118 | int rc = 0; |
| 119 | |
| 120 | if (matches == NULL) |
| 121 | matches = of_default_bus_ids; |
| 122 | if (matches == OF_NO_DEEP_PROBE) |
| 123 | return -EINVAL; |
| 124 | if (root == NULL) |
| 125 | root = of_find_node_by_path("/"); |
| 126 | else |
| 127 | of_node_get(root); |
| 128 | |
| 129 | pr_debug("of_platform_bus_probe()\n"); |
| 130 | pr_debug(" starting at: %s\n", root->full_name); |
| 131 | |
| 132 | /* Do a self check of bus type, if there's a match, create |
| 133 | * children |
| 134 | */ |
| 135 | if (of_match_node(matches, root)) { |
| 136 | pr_debug(" root match, create all sub devices\n"); |
| 137 | dev = of_platform_device_create(root, NULL, parent); |
| 138 | if (dev == NULL) { |
| 139 | rc = -ENOMEM; |
| 140 | goto bail; |
| 141 | } |
| 142 | pr_debug(" create all sub busses\n"); |
| 143 | rc = of_platform_bus_create(root, matches, &dev->dev); |
| 144 | goto bail; |
| 145 | } |
| 146 | for_each_child_of_node(root, child) { |
| 147 | if (!of_match_node(matches, child)) |
| 148 | continue; |
| 149 | |
| 150 | pr_debug(" match: %s\n", child->full_name); |
| 151 | dev = of_platform_device_create(child, NULL, parent); |
| 152 | if (dev == NULL) |
| 153 | rc = -ENOMEM; |
| 154 | else |
| 155 | rc = of_platform_bus_create(child, matches, &dev->dev); |
| 156 | if (rc) { |
| 157 | of_node_put(child); |
| 158 | break; |
| 159 | } |
| 160 | } |
| 161 | bail: |
| 162 | of_node_put(root); |
| 163 | return rc; |
| 164 | } |
| 165 | EXPORT_SYMBOL(of_platform_bus_probe); |
| 166 | |
| 167 | static int of_dev_node_match(struct device *dev, void *data) |
| 168 | { |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame^] | 169 | return to_of_device(dev)->dev.of_node == data; |
Michal Simek | 12e8414 | 2009-03-27 14:25:12 +0100 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | struct of_device *of_find_device_by_node(struct device_node *np) |
| 173 | { |
| 174 | struct device *dev; |
| 175 | |
| 176 | dev = bus_find_device(&of_platform_bus_type, |
| 177 | NULL, np, of_dev_node_match); |
| 178 | if (dev) |
| 179 | return to_of_device(dev); |
| 180 | return NULL; |
| 181 | } |
| 182 | EXPORT_SYMBOL(of_find_device_by_node); |
| 183 | |
| 184 | static int of_dev_phandle_match(struct device *dev, void *data) |
| 185 | { |
| 186 | phandle *ph = data; |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame^] | 187 | return to_of_device(dev)->dev.of_node->phandle == *ph; |
Michal Simek | 12e8414 | 2009-03-27 14:25:12 +0100 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | struct of_device *of_find_device_by_phandle(phandle ph) |
| 191 | { |
| 192 | struct device *dev; |
| 193 | |
| 194 | dev = bus_find_device(&of_platform_bus_type, |
| 195 | NULL, &ph, of_dev_phandle_match); |
| 196 | if (dev) |
| 197 | return to_of_device(dev); |
| 198 | return NULL; |
| 199 | } |
| 200 | EXPORT_SYMBOL(of_find_device_by_phandle); |