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vio.c

/*
 * IBM PowerPC Virtual I/O Infrastructure Support.
 *
 *    Copyright (c) 2003-2005 IBM Corp.
 *     Dave Engebretsen engebret@us.ibm.com
 *     Santiago Leon santil@us.ibm.com
 *     Hollis Blanchard <hollisb@us.ibm.com>
 *     Stephen Rothwell
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/types.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/kobject.h>

#include <asm/iommu.h>
#include <asm/dma.h>
#include <asm/vio.h>
#include <asm/prom.h>
#include <asm/firmware.h>
#include <asm/tce.h>
#include <asm/abs_addr.h>
#include <asm/page.h>
#include <asm/hvcall.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_call_xm.h>
#include <asm/iseries/iommu.h>

extern struct kset devices_subsys; /* needed for vio_find_name() */

static struct bus_type vio_bus_type;

static struct vio_dev vio_bus_device  = { /* fake "parent" device */
      .name = vio_bus_device.dev.bus_id,
      .type = "",
      .dev.bus_id = "vio",
      .dev.bus = &vio_bus_type,
};

static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
{
      const unsigned char *dma_window;
      struct iommu_table *tbl;
      unsigned long offset, size;

      if (firmware_has_feature(FW_FEATURE_ISERIES))
            return vio_build_iommu_table_iseries(dev);

      dma_window = of_get_property(dev->dev.archdata.of_node,
                          "ibm,my-dma-window", NULL);
      if (!dma_window)
            return NULL;

      tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);

      of_parse_dma_window(dev->dev.archdata.of_node, dma_window,
                      &tbl->it_index, &offset, &size);

      /* TCE table size - measured in tce entries */
      tbl->it_size = size >> IOMMU_PAGE_SHIFT;
      /* offset for VIO should always be 0 */
      tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
      tbl->it_busno = 0;
      tbl->it_type = TCE_VB;

      return iommu_init_table(tbl, -1);
}

/**
 * vio_match_device: - Tell if a VIO device has a matching
 *                VIO device id structure.
 * @ids:    array of VIO device id structures to search in
 * @dev:    the VIO device structure to match against
 *
 * Used by a driver to check whether a VIO device present in the
 * system is in its list of supported devices. Returns the matching
 * vio_device_id structure or NULL if there is no match.
 */
static const struct vio_device_id *vio_match_device(
            const struct vio_device_id *ids, const struct vio_dev *dev)
{
      while (ids->type[0] != '\0') {
            if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
                of_device_is_compatible(dev->dev.archdata.of_node,
                               ids->compat))
                  return ids;
            ids++;
      }
      return NULL;
}

/*
 * Convert from struct device to struct vio_dev and pass to driver.
 * dev->driver has already been set by generic code because vio_bus_match
 * succeeded.
 */
static int vio_bus_probe(struct device *dev)
{
      struct vio_dev *viodev = to_vio_dev(dev);
      struct vio_driver *viodrv = to_vio_driver(dev->driver);
      const struct vio_device_id *id;
      int error = -ENODEV;

      if (!viodrv->probe)
            return error;

      id = vio_match_device(viodrv->id_table, viodev);
      if (id)
            error = viodrv->probe(viodev, id);

      return error;
}

/* convert from struct device to struct vio_dev and pass to driver. */
static int vio_bus_remove(struct device *dev)
{
      struct vio_dev *viodev = to_vio_dev(dev);
      struct vio_driver *viodrv = to_vio_driver(dev->driver);

      if (viodrv->remove)
            return viodrv->remove(viodev);

      /* driver can't remove */
      return 1;
}

/**
 * vio_register_driver: - Register a new vio driver
 * @drv:    The vio_driver structure to be registered.
 */
int vio_register_driver(struct vio_driver *viodrv)
{
      printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
            viodrv->driver.name);

      /* fill in 'struct driver' fields */
      viodrv->driver.bus = &vio_bus_type;

      return driver_register(&viodrv->driver);
}
EXPORT_SYMBOL(vio_register_driver);

/**
 * vio_unregister_driver - Remove registration of vio driver.
 * @driver: The vio_driver struct to be removed form registration
 */
void vio_unregister_driver(struct vio_driver *viodrv)
{
      driver_unregister(&viodrv->driver);
}
EXPORT_SYMBOL(vio_unregister_driver);

/* vio_dev refcount hit 0 */
static void __devinit vio_dev_release(struct device *dev)
{
      /* XXX should free TCE table */
      of_node_put(dev->archdata.of_node);
      kfree(to_vio_dev(dev));
}

/**
 * vio_register_device_node: - Register a new vio device.
 * @of_node:      The OF node for this device.
 *
 * Creates and initializes a vio_dev structure from the data in
 * of_node and adds it to the list of virtual devices.
 * Returns a pointer to the created vio_dev or NULL if node has
 * NULL device_type or compatible fields.
 */
struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
{
      struct vio_dev *viodev;
      const unsigned int *unit_address;

      /* we need the 'device_type' property, in order to match with drivers */
      if (of_node->type == NULL) {
            printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
                        __FUNCTION__,
                        of_node->name ? of_node->name : "<unknown>");
            return NULL;
      }

      unit_address = of_get_property(of_node, "reg", NULL);
      if (unit_address == NULL) {
            printk(KERN_WARNING "%s: node %s missing 'reg'\n",
                        __FUNCTION__,
                        of_node->name ? of_node->name : "<unknown>");
            return NULL;
      }

      /* allocate a vio_dev for this node */
      viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
      if (viodev == NULL)
            return NULL;

      viodev->irq = irq_of_parse_and_map(of_node, 0);

      snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
      viodev->name = of_node->name;
      viodev->type = of_node->type;
      viodev->unit_address = *unit_address;
      if (firmware_has_feature(FW_FEATURE_ISERIES)) {
            unit_address = of_get_property(of_node,
                        "linux,unit_address", NULL);
            if (unit_address != NULL)
                  viodev->unit_address = *unit_address;
      }
      viodev->dev.archdata.of_node = of_node_get(of_node);
      viodev->dev.archdata.dma_ops = &dma_iommu_ops;
      viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev);
      viodev->dev.archdata.numa_node = of_node_to_nid(of_node);

      /* init generic 'struct device' fields: */
      viodev->dev.parent = &vio_bus_device.dev;
      viodev->dev.bus = &vio_bus_type;
      viodev->dev.release = vio_dev_release;

      /* register with generic device framework */
      if (device_register(&viodev->dev)) {
            printk(KERN_ERR "%s: failed to register device %s\n",
                        __FUNCTION__, viodev->dev.bus_id);
            /* XXX free TCE table */
            kfree(viodev);
            return NULL;
      }

      return viodev;
}
EXPORT_SYMBOL(vio_register_device_node);

/**
 * vio_bus_init: - Initialize the virtual IO bus
 */
static int __init vio_bus_init(void)
{
      int err;
      struct device_node *node_vroot;

      err = bus_register(&vio_bus_type);
      if (err) {
            printk(KERN_ERR "failed to register VIO bus\n");
            return err;
      }

      /*
       * The fake parent of all vio devices, just to give us
       * a nice directory
       */
      err = device_register(&vio_bus_device.dev);
      if (err) {
            printk(KERN_WARNING "%s: device_register returned %i\n",
                        __FUNCTION__, err);
            return err;
      }

      node_vroot = of_find_node_by_name(NULL, "vdevice");
      if (node_vroot) {
            struct device_node *of_node;

            /*
             * Create struct vio_devices for each virtual device in
             * the device tree. Drivers will associate with them later.
             */
            for (of_node = node_vroot->child; of_node != NULL;
                        of_node = of_node->sibling)
                  vio_register_device_node(of_node);
            of_node_put(node_vroot);
      }

      return 0;
}
__initcall(vio_bus_init);

static ssize_t name_show(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
}

static ssize_t devspec_show(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct device_node *of_node = dev->archdata.of_node;

      return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
}

static struct device_attribute vio_dev_attrs[] = {
      __ATTR_RO(name),
      __ATTR_RO(devspec),
      __ATTR_NULL
};

void __devinit vio_unregister_device(struct vio_dev *viodev)
{
      device_unregister(&viodev->dev);
}
EXPORT_SYMBOL(vio_unregister_device);

static int vio_bus_match(struct device *dev, struct device_driver *drv)
{
      const struct vio_dev *vio_dev = to_vio_dev(dev);
      struct vio_driver *vio_drv = to_vio_driver(drv);
      const struct vio_device_id *ids = vio_drv->id_table;

      return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
}

static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
{
      const struct vio_dev *vio_dev = to_vio_dev(dev);
      struct device_node *dn;
      const char *cp;

      dn = dev->archdata.of_node;
      if (!dn)
            return -ENODEV;
      cp = of_get_property(dn, "compatible", NULL);
      if (!cp)
            return -ENODEV;

      add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
      return 0;
}

static struct bus_type vio_bus_type = {
      .name = "vio",
      .dev_attrs = vio_dev_attrs,
      .uevent = vio_hotplug,
      .match = vio_bus_match,
      .probe = vio_bus_probe,
      .remove = vio_bus_remove,
};

/**
 * vio_get_attribute: - get attribute for virtual device
 * @vdev:   The vio device to get property.
 * @which:  The property/attribute to be extracted.
 * @length: Pointer to length of returned data size (unused if NULL).
 *
 * Calls prom.c's of_get_property() to return the value of the
 * attribute specified by @which
*/
const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
{
      return of_get_property(vdev->dev.archdata.of_node, which, length);
}
EXPORT_SYMBOL(vio_get_attribute);

#ifdef CONFIG_PPC_PSERIES
/* vio_find_name() - internal because only vio.c knows how we formatted the
 * kobject name
 * XXX once vio_bus_type.devices is actually used as a kset in
 * drivers/base/bus.c, this function should be removed in favor of
 * "device_find(kobj_name, &vio_bus_type)"
 */
static struct vio_dev *vio_find_name(const char *kobj_name)
{
      struct kobject *found;

      found = kset_find_obj(&devices_subsys, kobj_name);
      if (!found)
            return NULL;

      return to_vio_dev(container_of(found, struct device, kobj));
}

/**
 * vio_find_node - find an already-registered vio_dev
 * @vnode: device_node of the virtual device we're looking for
 */
struct vio_dev *vio_find_node(struct device_node *vnode)
{
      const uint32_t *unit_address;
      char kobj_name[BUS_ID_SIZE];

      /* construct the kobject name from the device node */
      unit_address = of_get_property(vnode, "reg", NULL);
      if (!unit_address)
            return NULL;
      snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);

      return vio_find_name(kobj_name);
}
EXPORT_SYMBOL(vio_find_node);

int vio_enable_interrupts(struct vio_dev *dev)
{
      int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
      if (rc != H_SUCCESS)
            printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
      return rc;
}
EXPORT_SYMBOL(vio_enable_interrupts);

int vio_disable_interrupts(struct vio_dev *dev)
{
      int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
      if (rc != H_SUCCESS)
            printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
      return rc;
}
EXPORT_SYMBOL(vio_disable_interrupts);
#endif /* CONFIG_PPC_PSERIES */

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