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.coherent_dma_mask = DMA_BIT_MASK(32); 80 81 dev->dev.bus = &of_platform_bus_type; 82 83 /* We do not fill the DMA ops for platform devices by default. 84 * This is currently the responsibility of the platform code 85 * to do such, possibly using a device notifier 86 */ 87 88 if (of_device_register(dev) != 0) { 89 of_device_free(dev); 90 return NULL; 91 } 92 93 return dev; 94 } 95 EXPORT_SYMBOL(of_platform_device_create); 96 97 98 99 /** 100 * of_platform_bus_create - Create an OF device for a bus node and all its 101 * children. Optionally recursively instanciate matching busses. 102 * @bus: device node of the bus to instanciate 103 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to 104 * disallow recursive creation of child busses 105 */ 106 static int of_platform_bus_create(const struct device_node *bus, 107 const struct of_device_id *matches, 108 struct device *parent) 109 { 110 struct device_node *child; 111 struct of_device *dev; 112 int rc = 0; 113 114 for_each_child_of_node(bus, child) { 115 pr_debug(" create child: %s\n", child->full_name); 116 dev = of_platform_device_create(child, NULL, parent); 117 if (dev == NULL) 118 rc = -ENOMEM; 119 else if (!of_match_node(matches, child)) 120 continue; 121 if (rc == 0) { 122 pr_debug(" and sub busses\n"); 123 rc = of_platform_bus_create(child, matches, &dev->dev); 124 } if (rc) { 125 of_node_put(child); 126 break; 127 } 128 } 129 return rc; 130 } 131 132 /** 133 * of_platform_bus_probe - Probe the device-tree for platform busses 134 * @root: parent of the first level to probe or NULL for the root of the tree 135 * @matches: match table, NULL to use the default 136 * @parent: parent to hook devices from, NULL for toplevel 137 * 138 * Note that children of the provided root are not instanciated as devices 139 * unless the specified root itself matches the bus list and is not NULL. 140 */ 141 142 int of_platform_bus_probe(struct device_node *root, 143 const struct of_device_id *matches, 144 struct device *parent) 145 { 146 struct device_node *child; 147 struct of_device *dev; 148 int rc = 0; 149 150 if (matches == NULL) 151 matches = of_default_bus_ids; 152 if (matches == OF_NO_DEEP_PROBE) 153 return -EINVAL; 154 if (root == NULL) 155 root = of_find_node_by_path("/"); 156 else 157 of_node_get(root); 158 159 pr_debug("of_platform_bus_probe()\n"); 160 pr_debug(" starting at: %s\n", root->full_name); 161 162 /* Do a self check of bus type, if there's a match, create 163 * children 164 */ 165 if (of_match_node(matches, root)) { 166 pr_debug(" root match, create all sub devices\n"); 167 dev = of_platform_device_create(root, NULL, parent); 168 if (dev == NULL) { 169 rc = -ENOMEM; 170 goto bail; 171 } 172 pr_debug(" create all sub busses\n"); 173 rc = of_platform_bus_create(root, matches, &dev->dev); 174 goto bail; 175 } 176 for_each_child_of_node(root, child) { 177 if (!of_match_node(matches, child)) 178 continue; 179 180 pr_debug(" match: %s\n", child->full_name); 181 dev = of_platform_device_create(child, NULL, parent); 182 if (dev == NULL) 183 rc = -ENOMEM; 184 else 185 rc = of_platform_bus_create(child, matches, &dev->dev); 186 if (rc) { 187 of_node_put(child); 188 break; 189 } 190 } 191 bail: 192 of_node_put(root); 193 return rc; 194 } 195 EXPORT_SYMBOL(of_platform_bus_probe); 196 197 static int of_dev_node_match(struct device *dev, void *data) 198 { 199 return to_of_device(dev)->node == data; 200 } 201 202 struct of_device *of_find_device_by_node(struct device_node *np) 203 { 204 struct device *dev; 205 206 dev = bus_find_device(&of_platform_bus_type, 207 NULL, np, of_dev_node_match); 208 if (dev) 209 return to_of_device(dev); 210 return NULL; 211 } 212 EXPORT_SYMBOL(of_find_device_by_node); 213 214 static int of_dev_phandle_match(struct device *dev, void *data) 215 { 216 phandle *ph = data; 217 return to_of_device(dev)->node->linux_phandle == *ph; 218 } 219 220 struct of_device *of_find_device_by_phandle(phandle ph) 221 { 222 struct device *dev; 223 224 dev = bus_find_device(&of_platform_bus_type, 225 NULL, &ph, of_dev_phandle_match); 226 if (dev) 227 return to_of_device(dev); 228 return NULL; 229 } 230 EXPORT_SYMBOL(of_find_device_by_phandle); 231 232 233 #ifdef CONFIG_PPC_OF_PLATFORM_PCI 234 235 /* The probing of PCI controllers from of_platform is currently 236 * 64 bits only, mostly due to gratuitous differences between 237 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one 238 * lacking some bits needed here. 239 */ 240 241 static int __devinit of_pci_phb_probe(struct of_device *dev, 242 const struct of_device_id *match) 243 { 244 struct pci_controller *phb; 245 246 /* Check if we can do that ... */ 247 if (ppc_md.pci_setup_phb == NULL) 248 return -ENODEV; 249 250 printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name); 251 252 /* Alloc and setup PHB data structure */ 253 phb = pcibios_alloc_controller(dev->node); 254 if (!phb) 255 return -ENODEV; 256 257 /* Setup parent in sysfs */ 258 phb->parent = &dev->dev; 259 260 /* Setup the PHB using arch provided callback */ 261 if (ppc_md.pci_setup_phb(phb)) { 262 pcibios_free_controller(phb); 263 return -ENODEV; 264 } 265 266 /* Process "ranges" property */ 267 pci_process_bridge_OF_ranges(phb, dev->node, 0); 268 269 /* Init pci_dn data structures */ 270 pci_devs_phb_init_dynamic(phb); 271 272 /* Register devices with EEH */ 273 #ifdef CONFIG_EEH 274 if (dev->node->child) 275 eeh_add_device_tree_early(dev->node); 276 #endif /* CONFIG_EEH */ 277 278 /* Scan the bus */ 279 pcibios_scan_phb(phb, dev->node); 280 if (phb->bus == NULL) 281 return -ENXIO; 282 283 /* Claim resources. This might need some rework as well depending 284 * wether we are doing probe-only or not, like assigning unassigned 285 * resources etc... 286 */ 287 pcibios_claim_one_bus(phb->bus); 288 289 /* Finish EEH setup */ 290 #ifdef CONFIG_EEH 291 eeh_add_device_tree_late(phb->bus); 292 #endif 293 294 /* Add probed PCI devices to the device model */ 295 pci_bus_add_devices(phb->bus); 296 297 return 0; 298 } 299 300 static struct of_device_id of_pci_phb_ids[] = { 301 { .type = "pci", }, 302 { .type = "pcix", }, 303 { .type = "pcie", }, 304 { .type = "pciex", }, 305 { .type = "ht", }, 306 {} 307 }; 308 309 static struct of_platform_driver of_pci_phb_driver = { 310 .match_table = of_pci_phb_ids, 311 .probe = of_pci_phb_probe, 312 .driver = { 313 .name = "of-pci", 314 }, 315 }; 316 317 static __init int of_pci_phb_init(void) 318 { 319 return of_register_platform_driver(&of_pci_phb_driver); 320 } 321 322 device_initcall(of_pci_phb_init); 323 324 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */ 325