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