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_device.h> 23 #include <linux/of_platform.h> 24 25 #include <asm/errno.h> 26 #include <asm/topology.h> 27 #include <asm/pci-bridge.h> 28 #include <asm/ppc-pci.h> 29 #include <asm/atomic.h> 30 31 /* 32 * The list of OF IDs below is used for matching bus types in the 33 * system whose devices are to be exposed as of_platform_devices. 34 * 35 * This is the default list valid for most platforms. This file provides 36 * functions who can take an explicit list if necessary though 37 * 38 * The search is always performed recursively looking for children of 39 * the provided device_node and recursively if such a children matches 40 * a bus type in the list 41 */ 42 43 static struct of_device_id of_default_bus_ids[] = { 44 { .type = "soc", }, 45 { .compatible = "soc", }, 46 { .type = "spider", }, 47 { .type = "axon", }, 48 { .type = "plb5", }, 49 { .type = "plb4", }, 50 { .type = "opb", }, 51 { .type = "ebc", }, 52 {}, 53 }; 54 55 struct bus_type of_platform_bus_type = { 56 .uevent = of_device_uevent, 57 }; 58 EXPORT_SYMBOL(of_platform_bus_type); 59 60 static int __init of_bus_driver_init(void) 61 { 62 return of_bus_type_init(&of_platform_bus_type, "of_platform"); 63 } 64 65 postcore_initcall(of_bus_driver_init); 66 67 int of_register_platform_driver(struct of_platform_driver *drv) 68 { 69 /* initialize common driver fields */ 70 if (!drv->driver.name) 71 drv->driver.name = drv->name; 72 if (!drv->driver.owner) 73 drv->driver.owner = drv->owner; 74 drv->driver.bus = &of_platform_bus_type; 75 76 /* register with core */ 77 return driver_register(&drv->driver); 78 } 79 EXPORT_SYMBOL(of_register_platform_driver); 80 81 void of_unregister_platform_driver(struct of_platform_driver *drv) 82 { 83 driver_unregister(&drv->driver); 84 } 85 EXPORT_SYMBOL(of_unregister_platform_driver); 86 87 struct of_device* of_platform_device_create(struct device_node *np, 88 const char *bus_id, 89 struct device *parent) 90 { 91 struct of_device *dev; 92 93 dev = of_device_alloc(np, bus_id, parent); 94 if (!dev) 95 return NULL; 96 97 dev->dma_mask = 0xffffffffUL; 98 dev->dev.bus = &of_platform_bus_type; 99 100 /* We do not fill the DMA ops for platform devices by default. 101 * This is currently the responsibility of the platform code 102 * to do such, possibly using a device notifier 103 */ 104 105 if (of_device_register(dev) != 0) { 106 of_device_free(dev); 107 return NULL; 108 } 109 110 return dev; 111 } 112 EXPORT_SYMBOL(of_platform_device_create); 113 114 115 116 /** 117 * of_platform_bus_create - Create an OF device for a bus node and all its 118 * children. Optionally recursively instanciate matching busses. 119 * @bus: device node of the bus to instanciate 120 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to 121 * disallow recursive creation of child busses 122 */ 123 static int of_platform_bus_create(struct device_node *bus, 124 struct of_device_id *matches, 125 struct device *parent) 126 { 127 struct device_node *child; 128 struct of_device *dev; 129 int rc = 0; 130 131 for (child = NULL; (child = of_get_next_child(bus, child)); ) { 132 pr_debug(" create child: %s\n", child->full_name); 133 dev = of_platform_device_create(child, NULL, parent); 134 if (dev == NULL) 135 rc = -ENOMEM; 136 else if (!of_match_node(matches, child)) 137 continue; 138 if (rc == 0) { 139 pr_debug(" and sub busses\n"); 140 rc = of_platform_bus_create(child, matches, &dev->dev); 141 } if (rc) { 142 of_node_put(child); 143 break; 144 } 145 } 146 return rc; 147 } 148 149 /** 150 * of_platform_bus_probe - Probe the device-tree for platform busses 151 * @root: parent of the first level to probe or NULL for the root of the tree 152 * @matches: match table, NULL to use the default 153 * @parent: parent to hook devices from, NULL for toplevel 154 * 155 * Note that children of the provided root are not instanciated as devices 156 * unless the specified root itself matches the bus list and is not NULL. 157 */ 158 159 int of_platform_bus_probe(struct device_node *root, 160 struct of_device_id *matches, 161 struct device *parent) 162 { 163 struct device_node *child; 164 struct of_device *dev; 165 int rc = 0; 166 167 if (matches == NULL) 168 matches = of_default_bus_ids; 169 if (matches == OF_NO_DEEP_PROBE) 170 return -EINVAL; 171 if (root == NULL) 172 root = of_find_node_by_path("/"); 173 else 174 of_node_get(root); 175 176 pr_debug("of_platform_bus_probe()\n"); 177 pr_debug(" starting at: %s\n", root->full_name); 178 179 /* Do a self check of bus type, if there's a match, create 180 * children 181 */ 182 if (of_match_node(matches, root)) { 183 pr_debug(" root match, create all sub devices\n"); 184 dev = of_platform_device_create(root, NULL, parent); 185 if (dev == NULL) { 186 rc = -ENOMEM; 187 goto bail; 188 } 189 pr_debug(" create all sub busses\n"); 190 rc = of_platform_bus_create(root, matches, &dev->dev); 191 goto bail; 192 } 193 for (child = NULL; (child = of_get_next_child(root, child)); ) { 194 if (!of_match_node(matches, child)) 195 continue; 196 197 pr_debug(" match: %s\n", child->full_name); 198 dev = of_platform_device_create(child, NULL, parent); 199 if (dev == NULL) 200 rc = -ENOMEM; 201 else 202 rc = of_platform_bus_create(child, matches, &dev->dev); 203 if (rc) { 204 of_node_put(child); 205 break; 206 } 207 } 208 bail: 209 of_node_put(root); 210 return rc; 211 } 212 EXPORT_SYMBOL(of_platform_bus_probe); 213 214 static int of_dev_node_match(struct device *dev, void *data) 215 { 216 return to_of_device(dev)->node == data; 217 } 218 219 struct of_device *of_find_device_by_node(struct device_node *np) 220 { 221 struct device *dev; 222 223 dev = bus_find_device(&of_platform_bus_type, 224 NULL, np, of_dev_node_match); 225 if (dev) 226 return to_of_device(dev); 227 return NULL; 228 } 229 EXPORT_SYMBOL(of_find_device_by_node); 230 231 static int of_dev_phandle_match(struct device *dev, void *data) 232 { 233 phandle *ph = data; 234 return to_of_device(dev)->node->linux_phandle == *ph; 235 } 236 237 struct of_device *of_find_device_by_phandle(phandle ph) 238 { 239 struct device *dev; 240 241 dev = bus_find_device(&of_platform_bus_type, 242 NULL, &ph, of_dev_phandle_match); 243 if (dev) 244 return to_of_device(dev); 245 return NULL; 246 } 247 EXPORT_SYMBOL(of_find_device_by_phandle); 248 249 250 #ifdef CONFIG_PPC_OF_PLATFORM_PCI 251 252 /* The probing of PCI controllers from of_platform is currently 253 * 64 bits only, mostly due to gratuitous differences between 254 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one 255 * lacking some bits needed here. 256 */ 257 258 static int __devinit of_pci_phb_probe(struct of_device *dev, 259 const struct of_device_id *match) 260 { 261 struct pci_controller *phb; 262 263 /* Check if we can do that ... */ 264 if (ppc_md.pci_setup_phb == NULL) 265 return -ENODEV; 266 267 printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name); 268 269 /* Alloc and setup PHB data structure */ 270 phb = pcibios_alloc_controller(dev->node); 271 if (!phb) 272 return -ENODEV; 273 274 /* Setup parent in sysfs */ 275 phb->parent = &dev->dev; 276 277 /* Setup the PHB using arch provided callback */ 278 if (ppc_md.pci_setup_phb(phb)) { 279 pcibios_free_controller(phb); 280 return -ENODEV; 281 } 282 283 /* Process "ranges" property */ 284 pci_process_bridge_OF_ranges(phb, dev->node, 0); 285 286 /* Init pci_dn data structures */ 287 pci_devs_phb_init_dynamic(phb); 288 289 /* Register devices with EEH */ 290 #ifdef CONFIG_EEH 291 if (dev->node->child) 292 eeh_add_device_tree_early(dev->node); 293 #endif /* CONFIG_EEH */ 294 295 /* Scan the bus */ 296 scan_phb(phb); 297 298 /* Claim resources. This might need some rework as well depending 299 * wether we are doing probe-only or not, like assigning unassigned 300 * resources etc... 301 */ 302 pcibios_claim_one_bus(phb->bus); 303 304 /* Finish EEH setup */ 305 #ifdef CONFIG_EEH 306 eeh_add_device_tree_late(phb->bus); 307 #endif 308 309 /* Add probed PCI devices to the device model */ 310 pci_bus_add_devices(phb->bus); 311 312 return 0; 313 } 314 315 static struct of_device_id of_pci_phb_ids[] = { 316 { .type = "pci", }, 317 { .type = "pcix", }, 318 { .type = "pcie", }, 319 { .type = "pciex", }, 320 { .type = "ht", }, 321 {} 322 }; 323 324 static struct of_platform_driver of_pci_phb_driver = { 325 .match_table = of_pci_phb_ids, 326 .probe = of_pci_phb_probe, 327 .driver = { 328 .name = "of-pci", 329 }, 330 }; 331 332 static __init int of_pci_phb_init(void) 333 { 334 return of_register_platform_driver(&of_pci_phb_driver); 335 } 336 337 device_initcall(of_pci_phb_init); 338 339 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */ 340