/*
* 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 subsystem devices_subsys; /* needed for vio_find_name() */
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,
};
#ifdef CONFIG_PPC_ISERIES
struct device *iSeries_vio_dev = &vio_bus_device.dev;
EXPORT_SYMBOL(iSeries_vio_dev);
static struct iommu_table veth_iommu_table;
static struct iommu_table vio_iommu_table;
static void __init iommu_vio_init(void)
{
iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table);
veth_iommu_table.it_size /= 2;
vio_iommu_table = veth_iommu_table;
vio_iommu_table.it_offset += veth_iommu_table.it_size;
if (!iommu_init_table(&veth_iommu_table, -1))
printk("Virtual Bus VETH TCE table failed.\n");
if (!iommu_init_table(&vio_iommu_table, -1))
printk("Virtual Bus VIO TCE table failed.\n");
}
#endif
static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
{
#ifdef CONFIG_PPC_ISERIES
if (firmware_has_feature(FW_FEATURE_ISERIES)) {
if (strcmp(dev->type, "network") == 0)
return &veth_iommu_table;
return &vio_iommu_table;
} else
#endif
{
const unsigned char *dma_window;
struct iommu_table *tbl;
unsigned long offset, size;
dma_window = get_property(dev->dev.platform_data,
"ibm,my-dma-window", NULL);
if (!dma_window)
return NULL;
tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
of_parse_dma_window(dev->dev.platform_data, dma_window,
&tbl->it_index, &offset, &size);
/* TCE table size - measured in tce entries */
tbl->it_size = size >> PAGE_SHIFT;
/* offset for VIO should always be 0 */
tbl->it_offset = offset >> 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) &&
device_is_compatible(dev->dev.platform_data, 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;
}
/* 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 (dev->driver && 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;
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)
{
if (dev->platform_data) {
/* XXX free TCE table */
of_node_put(dev->platform_data);
}
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 (dev.platform_data) 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 = 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->dev.platform_data = of_node_get(of_node);
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 = get_property(of_node,
"linux,unit_address", NULL);
if (unit_address != NULL)
viodev->unit_address = *unit_address;
}
viodev->iommu_table = vio_build_iommu_table(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);
/* 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;
#ifdef CONFIG_PPC_ISERIES
if (firmware_has_feature(FW_FEATURE_ISERIES)) {
iommu_vio_init();
vio_bus_device.iommu_table = &vio_iommu_table;
iSeries_vio_dev = &vio_bus_device.dev;
}
#endif
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 = find_devices("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) {
printk(KERN_DEBUG "%s: processing %p\n",
__FUNCTION__, of_node);
vio_register_device_node(of_node);
}
}
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->platform_data;
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 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,
~0ul, 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, ~0ul, 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, ~0ul, flag, -1);
}
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);
struct device_node *dn = dev->platform_data;
const char *cp;
int length;
if (!num_envp)
return -ENOMEM;
if (!dn)
return -ENODEV;
cp = get_property(dn, "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",
.dev_attrs = vio_dev_attrs,
.uevent = vio_hotplug,
.match = vio_bus_match,
.probe = vio_bus_probe,
.remove = vio_bus_remove,
.shutdown = vio_bus_shutdown,
};
/**
* 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 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 get_property(vdev->dev.platform_data, 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.kset, 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 = 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 */
