arch/powerpc/kernel/of_platform.c

   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 */