arch/powerpc/kernel/vio.c

   1 /*
   2  * IBM PowerPC Virtual I/O Infrastructure Support.
   3  *
   4  *    Copyright (c) 2003-2005 IBM Corp.
   5  *     Dave Engebretsen engebret@us.ibm.com
   6  *     Santiago Leon santil@us.ibm.com
   7  *     Hollis Blanchard <hollisb@us.ibm.com>
   8  *     Stephen Rothwell
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 #include <linux/types.h>
  17 #include <linux/device.h>
  18 #include <linux/init.h>
  19 #include <linux/console.h>
  20 #include <linux/module.h>
  21 #include <linux/mm.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/kobject.h>
  24
  25 #include <asm/iommu.h>
  26 #include <asm/dma.h>
  27 #include <asm/vio.h>
  28 #include <asm/prom.h>
  29 #include <asm/firmware.h>
  30 #include <asm/tce.h>
  31 #include <asm/abs_addr.h>
  32 #include <asm/page.h>
  33 #include <asm/hvcall.h>
  34 #include <asm/iseries/vio.h>
  35 #include <asm/iseries/hv_types.h>
  36 #include <asm/iseries/hv_lp_config.h>
  37 #include <asm/iseries/hv_call_xm.h>
  38 #include <asm/iseries/iommu.h>
  39
  40 extern struct subsystem devices_subsys; /* needed for vio_find_name() */
  41
  42 static struct vio_dev vio_bus_device  = { /* fake "parent" device */
  43         .name = vio_bus_device.dev.bus_id,
  44         .type = "",
  45         .dev.bus_id = "vio",
  46         .dev.bus = &vio_bus_type,
  47 };
  48
  49 #ifdef CONFIG_PPC_ISERIES
  50 struct device *iSeries_vio_dev = &vio_bus_device.dev;
  51 EXPORT_SYMBOL(iSeries_vio_dev);
  52
  53 static struct iommu_table veth_iommu_table;
  54 static struct iommu_table vio_iommu_table;
  55
  56 static void __init iommu_vio_init(void)
  57 {
  58         iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table);
  59         veth_iommu_table.it_size /= 2;
  60         vio_iommu_table = veth_iommu_table;
  61         vio_iommu_table.it_offset += veth_iommu_table.it_size;
  62
  63         if (!iommu_init_table(&veth_iommu_table, -1))
  64                 printk("Virtual Bus VETH TCE table failed.\n");
  65         if (!iommu_init_table(&vio_iommu_table, -1))
  66                 printk("Virtual Bus VIO TCE table failed.\n");
  67 }
  68 #endif
  69
  70 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
  71 {
  72 #ifdef CONFIG_PPC_ISERIES
  73         if (firmware_has_feature(FW_FEATURE_ISERIES)) {
  74                 if (strcmp(dev->type, "network") == 0)
  75                         return &veth_iommu_table;
  76                 return &vio_iommu_table;
  77         } else
  78 #endif
  79         {
  80                 const unsigned char *dma_window;
  81                 struct iommu_table *tbl;
  82                 unsigned long offset, size;
  83
  84                 dma_window = get_property(dev->dev.archdata.of_node,
  85                                           "ibm,my-dma-window", NULL);
  86                 if (!dma_window)
  87                         return NULL;
  88
  89                 tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
  90
  91                 of_parse_dma_window(dev->dev.archdata.of_node, dma_window,
  92                                     &tbl->it_index, &offset, &size);
  93
  94                 /* TCE table size - measured in tce entries */
  95                 tbl->it_size = size >> IOMMU_PAGE_SHIFT;
  96                 /* offset for VIO should always be 0 */
  97                 tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
  98                 tbl->it_busno = 0;
  99                 tbl->it_type = TCE_VB;
 100
 101                 return iommu_init_table(tbl, -1);
 102         }
 103 }
 104
 105 /**
 106  * vio_match_device: - Tell if a VIO device has a matching
 107  *                      VIO device id structure.
 108  * @ids:        array of VIO device id structures to search in
 109  * @dev:        the VIO device structure to match against
 110  *
 111  * Used by a driver to check whether a VIO device present in the
 112  * system is in its list of supported devices. Returns the matching
 113  * vio_device_id structure or NULL if there is no match.
 114  */
 115 static const struct vio_device_id *vio_match_device(
 116                 const struct vio_device_id *ids, const struct vio_dev *dev)
 117 {
 118         while (ids->type[0] != '\0') {
 119                 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
 120                     device_is_compatible(dev->dev.archdata.of_node,
 121                                          ids->compat))
 122                         return ids;
 123                 ids++;
 124         }
 125         return NULL;
 126 }
 127
 128 /*
 129  * Convert from struct device to struct vio_dev and pass to driver.
 130  * dev->driver has already been set by generic code because vio_bus_match
 131  * succeeded.
 132  */
 133 static int vio_bus_probe(struct device *dev)
 134 {
 135         struct vio_dev *viodev = to_vio_dev(dev);
 136         struct vio_driver *viodrv = to_vio_driver(dev->driver);
 137         const struct vio_device_id *id;
 138         int error = -ENODEV;
 139
 140         if (!viodrv->probe)
 141                 return error;
 142
 143         id = vio_match_device(viodrv->id_table, viodev);
 144         if (id)
 145                 error = viodrv->probe(viodev, id);
 146
 147         return error;
 148 }
 149
 150 /* convert from struct device to struct vio_dev and pass to driver. */
 151 static int vio_bus_remove(struct device *dev)
 152 {
 153         struct vio_dev *viodev = to_vio_dev(dev);
 154         struct vio_driver *viodrv = to_vio_driver(dev->driver);
 155
 156         if (viodrv->remove)
 157                 return viodrv->remove(viodev);
 158
 159         /* driver can't remove */
 160         return 1;
 161 }
 162
 163 /* convert from struct device to struct vio_dev and pass to driver. */
 164 static void vio_bus_shutdown(struct device *dev)
 165 {
 166         struct vio_dev *viodev = to_vio_dev(dev);
 167         struct vio_driver *viodrv = to_vio_driver(dev->driver);
 168
 169         if (dev->driver && viodrv->shutdown)
 170                 viodrv->shutdown(viodev);
 171 }
 172
 173 /**
 174  * vio_register_driver: - Register a new vio driver
 175  * @drv:        The vio_driver structure to be registered.
 176  */
 177 int vio_register_driver(struct vio_driver *viodrv)
 178 {
 179         printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
 180                 viodrv->driver.name);
 181
 182         /* fill in 'struct driver' fields */
 183         viodrv->driver.bus = &vio_bus_type;
 184
 185         return driver_register(&viodrv->driver);
 186 }
 187 EXPORT_SYMBOL(vio_register_driver);
 188
 189 /**
 190  * vio_unregister_driver - Remove registration of vio driver.
 191  * @driver:     The vio_driver struct to be removed form registration
 192  */
 193 void vio_unregister_driver(struct vio_driver *viodrv)
 194 {
 195         driver_unregister(&viodrv->driver);
 196 }
 197 EXPORT_SYMBOL(vio_unregister_driver);
 198
 199 /* vio_dev refcount hit 0 */
 200 static void __devinit vio_dev_release(struct device *dev)
 201 {
 202         if (dev->archdata.of_node) {
 203                 /* XXX should free TCE table */
 204                 of_node_put(dev->archdata.of_node);
 205         }
 206         kfree(to_vio_dev(dev));
 207 }
 208
 209 /**
 210  * vio_register_device_node: - Register a new vio device.
 211  * @of_node:    The OF node for this device.
 212  *
 213  * Creates and initializes a vio_dev structure from the data in
 214  * of_node and adds it to the list of virtual devices.
 215  * Returns a pointer to the created vio_dev or NULL if node has
 216  * NULL device_type or compatible fields.
 217  */
 218 struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
 219 {
 220         struct vio_dev *viodev;
 221         const unsigned int *unit_address;
 222
 223         /* we need the 'device_type' property, in order to match with drivers */
 224         if (of_node->type == NULL) {
 225                 printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
 226                                 __FUNCTION__,
 227                                 of_node->name ? of_node->name : "<unknown>");
 228                 return NULL;
 229         }
 230
 231         unit_address = get_property(of_node, "reg", NULL);
 232         if (unit_address == NULL) {
 233                 printk(KERN_WARNING "%s: node %s missing 'reg'\n",
 234                                 __FUNCTION__,
 235                                 of_node->name ? of_node->name : "<unknown>");
 236                 return NULL;
 237         }
 238
 239         /* allocate a vio_dev for this node */
 240         viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
 241         if (viodev == NULL)
 242                 return NULL;
 243
 244         viodev->irq = irq_of_parse_and_map(of_node, 0);
 245
 246         snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
 247         viodev->name = of_node->name;
 248         viodev->type = of_node->type;
 249         viodev->unit_address = *unit_address;
 250         if (firmware_has_feature(FW_FEATURE_ISERIES)) {
 251                 unit_address = get_property(of_node,
 252                                 "linux,unit_address", NULL);
 253                 if (unit_address != NULL)
 254                         viodev->unit_address = *unit_address;
 255         }
 256         viodev->dev.archdata.of_node = of_node_get(of_node);
 257         viodev->dev.archdata.dma_ops = &dma_iommu_ops;
 258         viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev);
 259         viodev->dev.archdata.numa_node = of_node_to_nid(of_node);
 260
 261         /* init generic 'struct device' fields: */
 262         viodev->dev.parent = &vio_bus_device.dev;
 263         viodev->dev.bus = &vio_bus_type;
 264         viodev->dev.release = vio_dev_release;
 265
 266         /* register with generic device framework */
 267         if (device_register(&viodev->dev)) {
 268                 printk(KERN_ERR "%s: failed to register device %s\n",
 269                                 __FUNCTION__, viodev->dev.bus_id);
 270                 /* XXX free TCE table */
 271                 kfree(viodev);
 272                 return NULL;
 273         }
 274
 275         return viodev;
 276 }
 277 EXPORT_SYMBOL(vio_register_device_node);
 278
 279 /**
 280  * vio_bus_init: - Initialize the virtual IO bus
 281  */
 282 static int __init vio_bus_init(void)
 283 {
 284         int err;
 285         struct device_node *node_vroot;
 286
 287 #ifdef CONFIG_PPC_ISERIES
 288         if (firmware_has_feature(FW_FEATURE_ISERIES)) {
 289                 iommu_vio_init();
 290                 vio_bus_device.dev.archdata.dma_ops = &dma_iommu_ops;
 291                 vio_bus_device.dev.archdata.dma_data = &vio_iommu_table;
 292                 iSeries_vio_dev = &vio_bus_device.dev;
 293         }
 294 #endif /* CONFIG_PPC_ISERIES */
 295
 296         err = bus_register(&vio_bus_type);
 297         if (err) {
 298                 printk(KERN_ERR "failed to register VIO bus\n");
 299                 return err;
 300         }
 301
 302         /*
 303          * The fake parent of all vio devices, just to give us
 304          * a nice directory
 305          */
 306         err = device_register(&vio_bus_device.dev);
 307         if (err) {
 308                 printk(KERN_WARNING "%s: device_register returned %i\n",
 309                                 __FUNCTION__, err);
 310                 return err;
 311         }
 312
 313         node_vroot = find_devices("vdevice");
 314         if (node_vroot) {
 315                 struct device_node *of_node;
 316
 317                 /*
 318                  * Create struct vio_devices for each virtual device in
 319                  * the device tree. Drivers will associate with them later.
 320                  */
 321                 for (of_node = node_vroot->child; of_node != NULL;
 322                                 of_node = of_node->sibling) {
 323                         printk(KERN_DEBUG "%s: processing %p\n",
 324                                         __FUNCTION__, of_node);
 325                         vio_register_device_node(of_node);
 326                 }
 327         }
 328
 329         return 0;
 330 }
 331 __initcall(vio_bus_init);
 332
 333 static ssize_t name_show(struct device *dev,
 334                 struct device_attribute *attr, char *buf)
 335 {
 336         return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
 337 }
 338
 339 static ssize_t devspec_show(struct device *dev,
 340                 struct device_attribute *attr, char *buf)
 341 {
 342         struct device_node *of_node = dev->archdata.of_node;
 343
 344         return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
 345 }
 346
 347 static struct device_attribute vio_dev_attrs[] = {
 348         __ATTR_RO(name),
 349         __ATTR_RO(devspec),
 350         __ATTR_NULL
 351 };
 352
 353 void __devinit vio_unregister_device(struct vio_dev *viodev)
 354 {
 355         device_unregister(&viodev->dev);
 356 }
 357 EXPORT_SYMBOL(vio_unregister_device);
 358
 359 static int vio_bus_match(struct device *dev, struct device_driver *drv)
 360 {
 361         const struct vio_dev *vio_dev = to_vio_dev(dev);
 362         struct vio_driver *vio_drv = to_vio_driver(drv);
 363         const struct vio_device_id *ids = vio_drv->id_table;
 364
 365         return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
 366 }
 367
 368 static int vio_hotplug(struct device *dev, char **envp, int num_envp,
 369                         char *buffer, int buffer_size)
 370 {
 371         const struct vio_dev *vio_dev = to_vio_dev(dev);
 372         struct device_node *dn;
 373         const char *cp;
 374         int length;
 375
 376         if (!num_envp)
 377                 return -ENOMEM;
 378
 379         dn = dev->archdata.of_node;
 380         if (!dn)
 381                 return -ENODEV;
 382         cp = get_property(dn, "compatible", &length);
 383         if (!cp)
 384                 return -ENODEV;
 385
 386         envp[0] = buffer;
 387         length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
 388                                 vio_dev->type, cp);
 389         if ((buffer_size - length) <= 0)
 390                 return -ENOMEM;
 391         envp[1] = NULL;
 392         return 0;
 393 }
 394
 395 struct bus_type vio_bus_type = {
 396         .name = "vio",
 397         .dev_attrs = vio_dev_attrs,
 398         .uevent = vio_hotplug,
 399         .match = vio_bus_match,
 400         .probe = vio_bus_probe,
 401         .remove = vio_bus_remove,
 402         .shutdown = vio_bus_shutdown,
 403 };
 404
 405 /**
 406  * vio_get_attribute: - get attribute for virtual device
 407  * @vdev:       The vio device to get property.
 408  * @which:      The property/attribute to be extracted.
 409  * @length:     Pointer to length of returned data size (unused if NULL).
 410  *
 411  * Calls prom.c's get_property() to return the value of the
 412  * attribute specified by @which
 413 */
 414 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
 415 {
 416         return get_property(vdev->dev.archdata.of_node, which, length);
 417 }
 418 EXPORT_SYMBOL(vio_get_attribute);
 419
 420 #ifdef CONFIG_PPC_PSERIES
 421 /* vio_find_name() - internal because only vio.c knows how we formatted the
 422  * kobject name
 423  * XXX once vio_bus_type.devices is actually used as a kset in
 424  * drivers/base/bus.c, this function should be removed in favor of
 425  * "device_find(kobj_name, &vio_bus_type)"
 426  */
 427 static struct vio_dev *vio_find_name(const char *kobj_name)
 428 {
 429         struct kobject *found;
 430
 431         found = kset_find_obj(&devices_subsys.kset, kobj_name);
 432         if (!found)
 433                 return NULL;
 434
 435         return to_vio_dev(container_of(found, struct device, kobj));
 436 }
 437
 438 /**
 439  * vio_find_node - find an already-registered vio_dev
 440  * @vnode: device_node of the virtual device we're looking for
 441  */
 442 struct vio_dev *vio_find_node(struct device_node *vnode)
 443 {
 444         const uint32_t *unit_address;
 445         char kobj_name[BUS_ID_SIZE];
 446
 447         /* construct the kobject name from the device node */
 448         unit_address = get_property(vnode, "reg", NULL);
 449         if (!unit_address)
 450                 return NULL;
 451         snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
 452
 453         return vio_find_name(kobj_name);
 454 }
 455 EXPORT_SYMBOL(vio_find_node);
 456
 457 int vio_enable_interrupts(struct vio_dev *dev)
 458 {
 459         int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
 460         if (rc != H_SUCCESS)
 461                 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
 462         return rc;
 463 }
 464 EXPORT_SYMBOL(vio_enable_interrupts);
 465
 466 int vio_disable_interrupts(struct vio_dev *dev)
 467 {
 468         int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
 469         if (rc != H_SUCCESS)
 470                 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
 471         return rc;
 472 }
 473 EXPORT_SYMBOL(vio_disable_interrupts);
 474 #endif /* CONFIG_PPC_PSERIES */