/*
* IBM PowerPC pSeries 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/module.h>
#include <linux/mm.h>
#include <linux/kobject.h>
#include <asm/iommu.h>
#include <asm/dma.h>
#include <asm/prom.h>
#include <asm/vio.h>
#include <asm/hvcall.h>
#include <asm/tce.h>
extern struct subsystem devices_subsys; /* needed for vio_find_name() */
static void probe_bus_pseries(void)
{
struct device_node *node_vroot, *of_node;
node_vroot = find_devices("vdevice");
if ((node_vroot == NULL) || (node_vroot->child == NULL))
/* this machine doesn't do virtual IO, and that's ok */
return;
/*
* 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);
}
}
/**
* vio_match_device_pseries: - Tell if a pSeries VIO device matches a
* vio_device_id
*/
static int vio_match_device_pseries(const struct vio_device_id *id,
const struct vio_dev *dev)
{
return (strncmp(dev->type, id->type, strlen(id->type)) == 0) &&
device_is_compatible(dev->dev.platform_data, id->compat);
}
static void vio_release_device_pseries(struct device *dev)
{
/* XXX free TCE table */
of_node_put(dev->platform_data);
}
static ssize_t viodev_show_devspec(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct device_node *of_node = dev->platform_data;
return sprintf(buf, "%s\n", of_node->full_name);
}
DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL);
static void vio_unregister_device_pseries(struct vio_dev *viodev)
{
device_remove_file(&viodev->dev, &dev_attr_devspec);
}
static struct vio_bus_ops vio_bus_ops_pseries = {
.match = vio_match_device_pseries,
.unregister_device = vio_unregister_device_pseries,
.release_device = vio_release_device_pseries,
};
/**
* vio_bus_init_pseries: - Initialize the pSeries virtual IO bus
*/
static int __init vio_bus_init_pseries(void)
{
int err;
err = vio_bus_init(&vio_bus_ops_pseries);
if (err == 0)
probe_bus_pseries();
return err;
}
__initcall(vio_bus_init_pseries);
/**
* vio_build_iommu_table: - gets the dma information from OF and
* builds the TCE tree.
* @dev: the virtual device.
*
* Returns a pointer to the built tce tree, or NULL if it can't
* find property.
*/
static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
{
unsigned int *dma_window;
struct iommu_table *newTceTable;
unsigned long offset;
int dma_window_property_size;
dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
if(!dma_window) {
return NULL;
}
newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
/* There should be some code to extract the phys-encoded offset
using prom_n_addr_cells(). However, according to a comment
on earlier versions, it's always zero, so we don't bother */
offset = dma_window[1] >> PAGE_SHIFT;
/* TCE table size - measured in tce entries */
newTceTable->it_size = dma_window[4] >> PAGE_SHIFT;
/* offset for VIO should always be 0 */
newTceTable->it_offset = offset;
newTceTable->it_busno = 0;
newTceTable->it_index = (unsigned long)dma_window[0];
newTceTable->it_type = TCE_VB;
return iommu_init_table(newTceTable);
}
/**
* 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;
unsigned int *unit_address;
unsigned int *irq_p;
/* we need the 'device_type' property, in order to match with drivers */
if ((NULL == of_node->type)) {
printk(KERN_WARNING
"%s: node %s missing 'device_type'\n", __FUNCTION__,
of_node->name ? of_node->name : "<unknown>");
return NULL;
}
unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
if (!unit_address) {
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 = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
if (!viodev) {
return NULL;
}
memset(viodev, 0, sizeof(struct vio_dev));
viodev->dev.platform_data = of_node_get(of_node);
viodev->irq = NO_IRQ;
irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
if (irq_p) {
int virq = virt_irq_create_mapping(*irq_p);
if (virq == NO_IRQ) {
printk(KERN_ERR "Unable to allocate interrupt "
"number for %s\n", of_node->full_name);
} else
viodev->irq = irq_offset_up(virq);
}
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;
viodev->iommu_table = vio_build_iommu_table(viodev);
/* register with generic device framework */
if (vio_register_device(viodev) == NULL) {
/* XXX free TCE table */
kfree(viodev);
return NULL;
}
device_create_file(&viodev->dev, &dev_attr_devspec);
return viodev;
}
EXPORT_SYMBOL(vio_register_device_node);
/**
* 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 the preprocessor constant @which
*/
const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
{
return get_property(vdev->dev.platform_data, (char*)which, length);
}
EXPORT_SYMBOL(vio_get_attribute);
/* 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)
{
uint32_t *unit_address;
char kobj_name[BUS_ID_SIZE];
/* construct the kobject name from the device node */
unit_address = (uint32_t *)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);
