/*
* IBM PowerPC Virtual I/O Infrastructure Support.
*
* Copyright (c) 2003 IBM Corp.
* Dave Engebretsen engebret@us.ibm.com
* Santiago Leon santil@us.ibm.com
* Hollis Blanchard <hollisb@us.ibm.com>
*
* 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/version.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <asm/rtas.h>
#include <asm/iommu.h>
#include <asm/dma.h>
#include <asm/ppcdebug.h>
#include <asm/vio.h>
#include <asm/hvcall.h>
#include <asm/iSeries/vio.h>
#include <asm/iSeries/HvTypes.h>
#include <asm/iSeries/HvCallXm.h>
#include <asm/iSeries/HvLpConfig.h>
#define DBGENTER() pr_debug("%s entered\n", __FUNCTION__)
extern struct subsystem devices_subsys; /* needed for vio_find_name() */
static const struct vio_device_id *vio_match_device(
const struct vio_device_id *, const struct vio_dev *);
#ifdef CONFIG_PPC_PSERIES
static struct iommu_table *vio_build_iommu_table(struct vio_dev *);
static int vio_num_address_cells;
#endif
static struct vio_dev *vio_bus_device; /* fake "parent" device */
#ifdef CONFIG_PPC_ISERIES
static struct vio_dev *__init vio_register_device_iseries(char *type,
uint32_t unit_num);
static struct iommu_table veth_iommu_table;
static struct iommu_table vio_iommu_table;
static struct vio_dev _vio_dev = {
.iommu_table = &vio_iommu_table,
.dev.bus = &vio_bus_type
};
struct device *iSeries_vio_dev = &_vio_dev.dev;
EXPORT_SYMBOL(iSeries_vio_dev);
#define device_is_compatible(a, b) 1
#endif
/* 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;
DBGENTER();
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);
DBGENTER();
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->name);
/* fill in 'struct driver' fields */
viodrv->driver.name = viodrv->name;
viodrv->driver.bus = &vio_bus_type;
viodrv->driver.probe = vio_bus_probe;
viodrv->driver.remove = vio_bus_remove;
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)
{
DBGENTER();
while (ids->type) {
if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
device_is_compatible(dev->dev.platform_data, ids->compat))
return ids;
ids++;
}
return NULL;
}
#ifdef CONFIG_PPC_ISERIES
void __init iommu_vio_init(void)
{
struct iommu_table *t;
struct iommu_table_cb cb;
unsigned long cbp;
unsigned long itc_entries;
cb.itc_busno = 255; /* Bus 255 is the virtual bus */
cb.itc_virtbus = 0xff; /* Ask for virtual bus */
cbp = virt_to_abs(&cb);
HvCallXm_getTceTableParms(cbp);
itc_entries = cb.itc_size * PAGE_SIZE / sizeof(union tce_entry);
veth_iommu_table.it_size = itc_entries / 2;
veth_iommu_table.it_busno = cb.itc_busno;
veth_iommu_table.it_offset = cb.itc_offset;
veth_iommu_table.it_index = cb.itc_index;
veth_iommu_table.it_type = TCE_VB;
veth_iommu_table.it_blocksize = 1;
t = iommu_init_table(&veth_iommu_table);
if (!t)
printk("Virtual Bus VETH TCE table failed.\n");
vio_iommu_table.it_size = itc_entries - veth_iommu_table.it_size;
vio_iommu_table.it_busno = cb.itc_busno;
vio_iommu_table.it_offset = cb.itc_offset +
veth_iommu_table.it_size;
vio_iommu_table.it_index = cb.itc_index;
vio_iommu_table.it_type = TCE_VB;
vio_iommu_table.it_blocksize = 1;
t = iommu_init_table(&vio_iommu_table);
if (!t)
printk("Virtual Bus VIO TCE table failed.\n");
}
#endif
#ifdef CONFIG_PPC_PSERIES
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;
vio_num_address_cells = prom_n_addr_cells(node_vroot->child);
/*
* 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);
}
}
#endif
#ifdef CONFIG_PPC_ISERIES
static void probe_bus_iseries(void)
{
HvLpIndexMap vlan_map = HvLpConfig_getVirtualLanIndexMap();
struct vio_dev *viodev;
int i;
/* there is only one of each of these */
vio_register_device_iseries("viocons", 0);
vio_register_device_iseries("vscsi", 0);
vlan_map = HvLpConfig_getVirtualLanIndexMap();
for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
if ((vlan_map & (0x8000 >> i)) == 0)
continue;
viodev = vio_register_device_iseries("vlan", i);
/* veth is special and has it own iommu_table */
viodev->iommu_table = &veth_iommu_table;
}
for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
vio_register_device_iseries("viodasd", i);
for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
vio_register_device_iseries("viocd", i);
for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
vio_register_device_iseries("viotape", i);
}
#endif
/**
* vio_bus_init: - Initialize the virtual IO bus
*/
static int __init vio_bus_init(void)
{
int err;
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 */
vio_bus_device = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
if (!vio_bus_device) {
return 1;
}
memset(vio_bus_device, 0, sizeof(struct vio_dev));
strcpy(vio_bus_device->dev.bus_id, "vio");
err = device_register(&vio_bus_device->dev);
if (err) {
printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__,
err);
kfree(vio_bus_device);
return err;
}
#ifdef CONFIG_PPC_PSERIES
probe_bus_pseries();
#endif
#ifdef CONFIG_PPC_ISERIES
probe_bus_iseries();
#endif
return 0;
}
__initcall(vio_bus_init);
/* vio_dev refcount hit 0 */
static void __devinit vio_dev_release(struct device *dev)
{
DBGENTER();
#ifdef CONFIG_PPC_PSERIES
/* XXX free TCE table */
of_node_put(dev->platform_data);
#endif
kfree(to_vio_dev(dev));
}
#ifdef CONFIG_PPC_PSERIES
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);
#endif
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);
static struct vio_dev * __devinit vio_register_device_common(
struct vio_dev *viodev, char *name, char *type,
uint32_t unit_address, struct iommu_table *iommu_table)
{
DBGENTER();
viodev->name = name;
viodev->type = type;
viodev->unit_address = unit_address;
viodev->iommu_table = iommu_table;
/* 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;
}
#ifdef CONFIG_PPC_PSERIES
/**
* 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;
DBGENTER();
/* 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);
/* register with generic device framework */
if (vio_register_device_common(viodev, of_node->name, of_node->type,
*unit_address, vio_build_iommu_table(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);
#endif
#ifdef CONFIG_PPC_ISERIES
/**
* vio_register_device: - Register a new vio device.
* @voidev: The device to register.
*/
static struct vio_dev *__init vio_register_device_iseries(char *type,
uint32_t unit_num)
{
struct vio_dev *viodev;
DBGENTER();
/* 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));
snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%s%d", type, unit_num);
return vio_register_device_common(viodev, viodev->dev.bus_id, type,
unit_num, &vio_iommu_table);
}
#endif
void __devinit vio_unregister_device(struct vio_dev *viodev)
{
DBGENTER();
#ifdef CONFIG_PPC_PSERIES
device_remove_file(&viodev->dev, &dev_attr_devspec);
#endif
device_remove_file(&viodev->dev, &dev_attr_name);
device_unregister(&viodev->dev);
}
EXPORT_SYMBOL(vio_unregister_device);
#ifdef CONFIG_PPC_PSERIES
/**
* 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);
/**
* 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);
}
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
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, unsigned int __nocast 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;
const struct vio_device_id *found_id;
DBGENTER();
if (!ids)
return 0;
found_id = vio_match_device(ids, vio_dev);
if (found_id)
return 1;
return 0;
}
struct bus_type vio_bus_type = {
.name = "vio",
.match = vio_bus_match,
};
EXPORT_SYMBOL(vio_bus_type);
