/*
* IBM PowerPC IBM eBus Infrastructure Support.
*
* Copyright (c) 2005 IBM Corporation
* Joachim Fenkes <[email protected]>
* Heiko J Schick <[email protected]>
*
* All rights reserved.
*
* This source code is distributed under a dual license of GPL v2.0 and OpenIB
* BSD.
*
* OpenIB BSD License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/init.h>
#include <linux/export.h>
#include <linux/console.h>
#include <linux/kobject.h>
#include <linux/dma-map-ops.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <asm/ibmebus.h>
#include <asm/machdep.h>
static struct device ibmebus_bus_device = { /* fake "parent" device */
.init_name = "ibmebus",
};
const struct bus_type ibmebus_bus_type;
/* These devices will automatically be added to the bus during init */
static const struct of_device_id ibmebus_matches[] __initconst = {
{ .compatible = "IBM,lhca" },
{ .compatible = "IBM,lhea" },
{},
};
static void *ibmebus_alloc_coherent(struct device *dev,
size_t size,
dma_addr_t *dma_handle,
gfp_t flag,
unsigned long attrs)
{
void *mem;
mem = kmalloc(size, flag);
*dma_handle = (dma_addr_t)mem;
return mem;
}
static void ibmebus_free_coherent(struct device *dev,
size_t size, void *vaddr,
dma_addr_t dma_handle,
unsigned long attrs)
{
kfree(vaddr);
}
static dma_addr_t ibmebus_map_page(struct device *dev,
struct page *page,
unsigned long offset,
size_t size,
enum dma_data_direction direction,
unsigned long attrs)
{
return (dma_addr_t)(page_address(page) + offset);
}
static void ibmebus_unmap_page(struct device *dev,
dma_addr_t dma_addr,
size_t size,
enum dma_data_direction direction,
unsigned long attrs)
{
return;
}
static int ibmebus_map_sg(struct device *dev,
struct scatterlist *sgl,
int nents, enum dma_data_direction direction,
unsigned long attrs)
{
struct scatterlist *sg;
int i;
for_each_sg(sgl, sg, nents, i) {
sg->dma_address = (dma_addr_t) sg_virt(sg);
sg->dma_length = sg->length;
}
return nents;
}
static void ibmebus_unmap_sg(struct device *dev,
struct scatterlist *sg,
int nents, enum dma_data_direction direction,
unsigned long attrs)
{
return;
}
static int ibmebus_dma_supported(struct device *dev, u64 mask)
{
return mask == DMA_BIT_MASK(64);
}
static u64 ibmebus_dma_get_required_mask(struct device *dev)
{
return DMA_BIT_MASK(64);
}
static const struct dma_map_ops ibmebus_dma_ops = {
.alloc = ibmebus_alloc_coherent,
.free = ibmebus_free_coherent,
.map_sg = ibmebus_map_sg,
.unmap_sg = ibmebus_unmap_sg,
.dma_supported = ibmebus_dma_supported,
.get_required_mask = ibmebus_dma_get_required_mask,
.map_page = ibmebus_map_page,
.unmap_page = ibmebus_unmap_page,
};
static int ibmebus_match_path(struct device *dev, const void *data)
{
struct device_node *dn = to_platform_device(dev)->dev.of_node;
struct device_node *tn = of_find_node_by_path(data);
of_node_put(tn);
return (tn == dn);
}
static int ibmebus_match_node(struct device *dev, const void *data)
{
return to_platform_device(dev)->dev.of_node == data;
}
static int ibmebus_create_device(struct device_node *dn)
{
struct platform_device *dev;
int ret;
dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
if (!dev)
return -ENOMEM;
dev->dev.bus = &ibmebus_bus_type;
dev->dev.dma_ops = &ibmebus_dma_ops;
ret = of_device_add(dev);
if (ret)
platform_device_put(dev);
return ret;
}
static int ibmebus_create_devices(const struct of_device_id *matches)
{
struct device_node *root, *child;
struct device *dev;
int ret = 0;
root = of_find_node_by_path("/");
for_each_child_of_node(root, child) {
if (!of_match_node(matches, child))
continue;
dev = bus_find_device(&ibmebus_bus_type, NULL, child,
ibmebus_match_node);
if (dev) {
put_device(dev);
continue;
}
ret = ibmebus_create_device(child);
if (ret) {
printk(KERN_ERR "%s: failed to create device (%i)",
__func__, ret);
of_node_put(child);
break;
}
}
of_node_put(root);
return ret;
}
int ibmebus_register_driver(struct platform_driver *drv)
{
/* If the driver uses devices that ibmebus doesn't know, add them */
ibmebus_create_devices(drv->driver.of_match_table);
drv->driver.bus = &ibmebus_bus_type;
return driver_register(&drv->driver);
}
EXPORT_SYMBOL(ibmebus_register_driver);
void ibmebus_unregister_driver(struct platform_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(ibmebus_unregister_driver);
int ibmebus_request_irq(u32 ist, irq_handler_t handler,
unsigned long irq_flags, const char *devname,
void *dev_id)
{
unsigned int irq = irq_create_mapping(NULL, ist);
if (!irq)
return -EINVAL;
return request_irq(irq, handler, irq_flags, devname, dev_id);
}
EXPORT_SYMBOL(ibmebus_request_irq);
void ibmebus_free_irq(u32 ist, void *dev_id)
{
unsigned int irq = irq_find_mapping(NULL, ist);
free_irq(irq, dev_id);
irq_dispose_mapping(irq);
}
EXPORT_SYMBOL(ibmebus_free_irq);
static char *ibmebus_chomp(const char *in, size_t count)
{
char *out = kmalloc(count + 1, GFP_KERNEL);
if (!out)
return NULL;
memcpy(out, in, count);
out[count] = '\0';
if (out[count - 1] == '\n')
out[count - 1] = '\0';
return out;
}
static ssize_t probe_store(const struct bus_type *bus, const char *buf, size_t count)
{
struct device_node *dn = NULL;
struct device *dev;
char *path;
ssize_t rc = 0;
path = ibmebus_chomp(buf, count);
if (!path)
return -ENOMEM;
dev = bus_find_device(&ibmebus_bus_type, NULL, path,
ibmebus_match_path);
if (dev) {
put_device(dev);
printk(KERN_WARNING "%s: %s has already been probed\n",
__func__, path);
rc = -EEXIST;
goto out;
}
if ((dn = of_find_node_by_path(path))) {
rc = ibmebus_create_device(dn);
of_node_put(dn);
} else {
printk(KERN_WARNING "%s: no such device node: %s\n",
__func__, path);
rc = -ENODEV;
}
out:
kfree(path);
if (rc)
return rc;
return count;
}
static BUS_ATTR_WO(probe);
static ssize_t remove_store(const struct bus_type *bus, const char *buf, size_t count)
{
struct device *dev;
char *path;
path = ibmebus_chomp(buf, count);
if (!path)
return -ENOMEM;
if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
ibmebus_match_path))) {
of_device_unregister(to_platform_device(dev));
put_device(dev);
kfree(path);
return count;
} else {
printk(KERN_WARNING "%s: %s not on the bus\n",
__func__, path);
kfree(path);
return -ENODEV;
}
}
static BUS_ATTR_WO(remove);
static struct attribute *ibmbus_bus_attrs[] = {
&bus_attr_probe.attr,
&bus_attr_remove.attr,
NULL,
};
ATTRIBUTE_GROUPS(ibmbus_bus);
static int ibmebus_bus_bus_match(struct device *dev, const struct device_driver *drv)
{
const struct of_device_id *matches = drv->of_match_table;
if (!matches)
return 0;
return of_match_device(matches, dev) != NULL;
}
static int ibmebus_bus_device_probe(struct device *dev)
{
int error = -ENODEV;
struct platform_driver *drv;
struct platform_device *of_dev;
drv = to_platform_driver(dev->driver);
of_dev = to_platform_device(dev);
if (!drv->probe)
return error;
get_device(dev);
if (of_driver_match_device(dev, dev->driver))
error = drv->probe(of_dev);
if (error)
put_device(dev);
return error;
}
static void ibmebus_bus_device_remove(struct device *dev)
{
struct platform_device *of_dev = to_platform_device(dev);
struct platform_driver *drv = to_platform_driver(dev->driver);
if (dev->driver && drv->remove)
drv->remove(of_dev);
}
static void ibmebus_bus_device_shutdown(struct device *dev)
{
struct platform_device *of_dev = to_platform_device(dev);
struct platform_driver *drv = to_platform_driver(dev->driver);
if (dev->driver && drv->shutdown)
drv->shutdown(of_dev);
}
/*
* ibmebus_bus_device_attrs
*/
static ssize_t devspec_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *ofdev;
ofdev = to_platform_device(dev);
return sprintf(buf, "%pOF\n", ofdev->dev.of_node);
}
static DEVICE_ATTR_RO(devspec);
static ssize_t name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *ofdev;
ofdev = to_platform_device(dev);
return sprintf(buf, "%pOFn\n", ofdev->dev.of_node);
}
static DEVICE_ATTR_RO(name);
static ssize_t modalias_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return of_device_modalias(dev, buf, PAGE_SIZE);
}
static DEVICE_ATTR_RO(modalias);
static struct attribute *ibmebus_bus_device_attrs[] = {
&dev_attr_devspec.attr,
&dev_attr_name.attr,
&dev_attr_modalias.attr,
NULL,
};
ATTRIBUTE_GROUPS(ibmebus_bus_device);
static int ibmebus_bus_modalias(const struct device *dev, struct kobj_uevent_env *env)
{
return of_device_uevent_modalias(dev, env);
}
const struct bus_type ibmebus_bus_type = {
.name = "ibmebus",
.uevent = ibmebus_bus_modalias,
.bus_groups = ibmbus_bus_groups,
.match = ibmebus_bus_bus_match,
.probe = ibmebus_bus_device_probe,
.remove = ibmebus_bus_device_remove,
.shutdown = ibmebus_bus_device_shutdown,
.dev_groups = ibmebus_bus_device_groups,
};
EXPORT_SYMBOL(ibmebus_bus_type);
static int __init ibmebus_bus_init(void)
{
int err;
printk(KERN_INFO "IBM eBus Device Driver\n");
err = bus_register(&ibmebus_bus_type);
if (err) {
printk(KERN_ERR "%s: failed to register IBM eBus.\n",
__func__);
return err;
}
err = device_register(&ibmebus_bus_device);
if (err) {
printk(KERN_WARNING "%s: device_register returned %i\n",
__func__, err);
put_device(&ibmebus_bus_device);
bus_unregister(&ibmebus_bus_type);
return err;
}
err = ibmebus_create_devices(ibmebus_matches);
if (err) {
device_unregister(&ibmebus_bus_device);
bus_unregister(&ibmebus_bus_type);
return err;
}
return 0;
}
machine_postcore_initcall(pseries, ibmebus_bus_init);
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