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> 20 #include <linux/slab.h> 21 #include <linux/pci.h> 22 #include <linux/of.h> 23 #include <linux/of_device.h> 24 #include <linux/of_platform.h> 25 26 #include <asm/errno.h> 27 #include <asm/topology.h> 28 #include <asm/pci-bridge.h> 29 #include <asm/ppc-pci.h> 30 #include <asm/atomic.h> 31 32 /* 33 * The list of OF IDs below is used for matching bus types in the 34 * system whose devices are to be exposed as of_platform_devices. 35 * 36 * This is the default list valid for most platforms. This file provides 37 * functions who can take an explicit list if necessary though 38 * 39 * The search is always performed recursively looking for children of 40 * the provided device_node and recursively if such a children matches 41 * a bus type in the list 42 */ 43 44 static const struct of_device_id of_default_bus_ids[] = { 45 { .type = "soc", }, 46 { .compatible = "soc", }, 47 { .type = "spider", }, 48 { .type = "axon", }, 49 { .type = "plb5", }, 50 { .type = "plb4", }, 51 { .type = "opb", }, 52 { .type = "ebc", }, 53 {}, 54 }; 55 56 struct bus_type of_platform_bus_type = { 57 .uevent = of_device_uevent, 58 }; 59 EXPORT_SYMBOL(of_platform_bus_type); 60 61 static int __init of_bus_driver_init(void) 62 { 63 return of_bus_type_init(&of_platform_bus_type, "of_platform"); 64 } 65 66 postcore_initcall(of_bus_driver_init); 67 68 struct of_device* of_platform_device_create(struct device_node *np, 69 const char *bus_id, 70 struct device *parent) 71 { 72 struct of_device *dev; 73 74 dev = of_device_alloc(np, bus_id, parent); 75 if (!dev) 76 return NULL; 77 78 dev->dma_mask = 0xffffffffUL; 79 dev->dev.bus = &of_platform_bus_type; 80 81 /* We do not fill the DMA ops for platform devices by default. 82 * This is currently the responsibility of the platform code 83 * to do such, possibly using a device notifier 84 */ 85 86 if (of_device_register(dev) != 0) { 87 of_device_free(dev); 88 return NULL; 89 } 90 91 return dev; 92 } 93 EXPORT_SYMBOL(of_platform_device_create); 94 95 96 97 /** 98 * of_platform_bus_create - Create an OF device for a bus node and all its 99 * children. Optionally recursively instanciate matching busses. 100 * @bus: device node of the bus to instanciate 101 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to 102 * disallow recursive creation of child busses 103 */ 104 static int of_platform_bus_create(const struct device_node *bus, 105 const struct of_device_id *matches, 106 struct device *parent) 107 { 108 struct device_node *child; 109 struct of_device *dev; 110 int rc = 0; 111 112 for_each_child_of_node(bus, child) { 113 pr_debug(" create child: %s\n", child->full_name); 114 dev = of_platform_device_create(child, NULL, parent); 115 if (dev == NULL) 116 rc = -ENOMEM; 117 else if (!of_match_node(matches, child)) 118 continue; 119 if (rc == 0) { 120 pr_debug(" and sub busses\n"); 121 rc = of_platform_bus_create(child, matches, &dev->dev); 122 } if (rc) { 123 of_node_put(child); 124 break; 125 } 126 } 127 return rc; 128 } 129 130 /** 131 * of_platform_bus_probe - Probe the device-tree for platform busses 132 * @root: parent of the first level to probe or NULL for the root of the tree 133 * @matches: match table, NULL to use the default 134 * @parent: parent to hook devices from, NULL for toplevel 135 * 136 * Note that children of the provided root are not instanciated as devices 137 * unless the specified root itself matches the bus list and is not NULL. 138 */ 139 140 int of_platform_bus_probe(struct device_node *root, 141 const struct of_device_id *matches, 142 struct device *parent) 143 { 144 struct device_node *child; 145 struct of_device *dev; 146 int rc = 0; 147 148 if (matches == NULL) 149 matches = of_default_bus_ids; 150 if (matches == OF_NO_DEEP_PROBE) 151 return -EINVAL; 152 if (root == NULL) 153 root = of_find_node_by_path("/"); 154 else 155 of_node_get(root); 156 157 pr_debug("of_platform_bus_probe()\n"); 158 pr_debug(" starting at: %s\n", root->full_name); 159 160 /* Do a self check of bus type, if there's a match, create 161 * children 162 */ 163 if (of_match_node(matches, root)) { 164 pr_debug(" root match, create all sub devices\n"); 165 dev = of_platform_device_create(root, NULL, parent); 166 if (dev == NULL) { 167 rc = -ENOMEM; 168 goto bail; 169 } 170 pr_debug(" create all sub busses\n"); 171 rc = of_platform_bus_create(root, matches, &dev->dev); 172 goto bail; 173 } 174 for_each_child_of_node(root, child) { 175 if (!of_match_node(matches, child)) 176 continue; 177 178 pr_debug(" match: %s\n", child->full_name); 179 dev = of_platform_device_create(child, NULL, parent); 180 if (dev == NULL) 181 rc = -ENOMEM; 182 else 183 rc = of_platform_bus_create(child, matches, &dev->dev); 184 if (rc) { 185 of_node_put(child); 186 break; 187 } 188 } 189 bail: 190 of_node_put(root); 191 return rc; 192 } 193 EXPORT_SYMBOL(of_platform_bus_probe); 194 195 static int of_dev_node_match(struct device *dev, void *data) 196 { 197 return to_of_device(dev)->node == data; 198 } 199 200 struct of_device *of_find_device_by_node(struct device_node *np) 201 { 202 struct device *dev; 203 204 dev = bus_find_device(&of_platform_bus_type, 205 NULL, np, of_dev_node_match); 206 if (dev) 207 return to_of_device(dev); 208 return NULL; 209 } 210 EXPORT_SYMBOL(of_find_device_by_node); 211 212 static int of_dev_phandle_match(struct device *dev, void *data) 213 { 214 phandle *ph = data; 215 return to_of_device(dev)->node->linux_phandle == *ph; 216 } 217 218 struct of_device *of_find_device_by_phandle(phandle ph) 219 { 220 struct device *dev; 221 222 dev = bus_find_device(&of_platform_bus_type, 223 NULL, &ph, of_dev_phandle_match); 224 if (dev) 225 return to_of_device(dev); 226 return NULL; 227 } 228 EXPORT_SYMBOL(of_find_device_by_phandle); 229 230 231 #ifdef CONFIG_PPC_OF_PLATFORM_PCI 232 233 /* The probing of PCI controllers from of_platform is currently 234 * 64 bits only, mostly due to gratuitous differences between 235 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one 236 * lacking some bits needed here. 237 */ 238 239 static int __devinit of_pci_phb_probe(struct of_device *dev, 240 const struct of_device_id *match) 241 { 242 struct pci_controller *phb; 243 244 /* Check if we can do that ... */ 245 if (ppc_md.pci_setup_phb == NULL) 246 return -ENODEV; 247 248 printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name); 249 250 /* Alloc and setup PHB data structure */ 251 phb = pcibios_alloc_controller(dev->node); 252 if (!phb) 253 return -ENODEV; 254 255 /* Setup parent in sysfs */ 256 phb->parent = &dev->dev; 257 258 /* Setup the PHB using arch provided callback */ 259 if (ppc_md.pci_setup_phb(phb)) { 260 pcibios_free_controller(phb); 261 return -ENODEV; 262 } 263 264 /* Process "ranges" property */ 265 pci_process_bridge_OF_ranges(phb, dev->node, 0); 266 267 /* Init pci_dn data structures */ 268 pci_devs_phb_init_dynamic(phb); 269 270 /* Register devices with EEH */ 271 #ifdef CONFIG_EEH 272 if (dev->node->child) 273 eeh_add_device_tree_early(dev->node); 274 #endif /* CONFIG_EEH */ 275 276 /* Scan the bus */ 277 scan_phb(phb); 278 279 /* Claim resources. This might need some rework as well depending 280 * wether we are doing probe-only or not, like assigning unassigned 281 * resources etc... 282 */ 283 pcibios_claim_one_bus(phb->bus); 284 285 /* Finish EEH setup */ 286 #ifdef CONFIG_EEH 287 eeh_add_device_tree_late(phb->bus); 288 #endif 289 290 /* Add probed PCI devices to the device model */ 291 pci_bus_add_devices(phb->bus); 292 293 return 0; 294 } 295 296 static struct of_device_id of_pci_phb_ids[] = { 297 { .type = "pci", }, 298 { .type = "pcix", }, 299 { .type = "pcie", }, 300 { .type = "pciex", }, 301 { .type = "ht", }, 302 {} 303 }; 304 305 static struct of_platform_driver of_pci_phb_driver = { 306 .match_table = of_pci_phb_ids, 307 .probe = of_pci_phb_probe, 308 .driver = { 309 .name = "of-pci", 310 }, 311 }; 312 313 static __init int of_pci_phb_init(void) 314 { 315 return of_register_platform_driver(&of_pci_phb_driver); 316 } 317 318 device_initcall(of_pci_phb_init); 319 320 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */ 321