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_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 */