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