linux/arch/powerpc/kernel/vio.c

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/*
* 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/init.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <asm/iommu.h>
#include <asm/dma.h>
#include <asm/vio.h>
#include <asm/prom.h>
static const struct vio_device_id *vio_match_device(
const struct vio_device_id *, const struct vio_dev *);
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 vio_bus_ops vio_bus_ops;
/*
* 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;
}
/* convert from struct device to struct vio_dev and pass to driver. */
static void vio_bus_shutdown(struct device *dev)
{
struct vio_dev *viodev = to_vio_dev(dev);
struct vio_driver *viodrv = to_vio_driver(dev->driver);
if (viodrv->shutdown)
viodrv->shutdown(viodev);
}
/**
* 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;
viodrv->driver.probe = vio_bus_probe;
viodrv->driver.remove = vio_bus_remove;
viodrv->driver.shutdown = vio_bus_shutdown;
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_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 (vio_bus_ops.match(ids, dev))
return ids;
ids++;
}
return NULL;
}
/**
* vio_bus_init: - Initialize the virtual IO bus
*/
int __init vio_bus_init(struct vio_bus_ops *ops)
{
int err;
vio_bus_ops = *ops;
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;
}
return 0;
}
/* vio_dev refcount hit 0 */
static void __devinit vio_dev_release(struct device *dev)
{
if (vio_bus_ops.release_device)
vio_bus_ops.release_device(dev);
kfree(to_vio_dev(dev));
}
static ssize_t viodev_show_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
}
DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL);
struct vio_dev * __devinit vio_register_device(struct vio_dev *viodev)
{
/* 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);
return NULL;
}
device_create_file(&viodev->dev, &dev_attr_name);
return viodev;
}
void __devinit vio_unregister_device(struct vio_dev *viodev)
{
if (vio_bus_ops.unregister_device)
vio_bus_ops.unregister_device(viodev);
device_remove_file(&viodev->dev, &dev_attr_name);
device_unregister(&viodev->dev);
}
EXPORT_SYMBOL(vio_unregister_device);
static dma_addr_t vio_map_single(struct device *dev, void *vaddr,
size_t size, enum dma_data_direction direction)
{
return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size,
direction);
}
static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction)
{
iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size,
direction);
}
static int vio_map_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist,
nelems, direction);
}
static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction);
}
static void *vio_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size,
dma_handle, flag);
}
static void vio_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr,
dma_handle);
}
static int vio_dma_supported(struct device *dev, u64 mask)
{
return 1;
}
struct dma_mapping_ops vio_dma_ops = {
.alloc_coherent = vio_alloc_coherent,
.free_coherent = vio_free_coherent,
.map_single = vio_map_single,
.unmap_single = vio_unmap_single,
.map_sg = vio_map_sg,
.unmap_sg = vio_unmap_sg,
.dma_supported = vio_dma_supported,
};
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, char **envp, int num_envp,
char *buffer, int buffer_size)
{
const struct vio_dev *vio_dev = to_vio_dev(dev);
char *cp;
int length;
if (!num_envp)
return -ENOMEM;
if (!vio_dev->dev.platform_data)
return -ENODEV;
cp = (char *)get_property(vio_dev->dev.platform_data, "compatible", &length);
if (!cp)
return -ENODEV;
envp[0] = buffer;
length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
vio_dev->type, cp);
if (buffer_size - length <= 0)
return -ENOMEM;
envp[1] = NULL;
return 0;
}
struct bus_type vio_bus_type = {
.name = "vio",
.hotplug = vio_hotplug,
.match = vio_bus_match,
};