397 lines
9.4 KiB
C
397 lines
9.4 KiB
C
/*
|
|
* IBM PowerPC IBM eBus Infrastructure Support.
|
|
*
|
|
* Copyright (c) 2005 IBM Corporation
|
|
* Heiko J Schick <schickhj@de.ibm.com>
|
|
*
|
|
* 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/console.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/interrupt.h>
|
|
#include <asm/ibmebus.h>
|
|
#include <asm/abs_addr.h>
|
|
|
|
static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */
|
|
.name = ibmebus_bus_device.ofdev.dev.bus_id,
|
|
.ofdev.dev.bus_id = "ibmebus",
|
|
.ofdev.dev.bus = &ibmebus_bus_type,
|
|
};
|
|
|
|
static void *ibmebus_alloc_coherent(struct device *dev,
|
|
size_t size,
|
|
dma_addr_t *dma_handle,
|
|
gfp_t flag)
|
|
{
|
|
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)
|
|
{
|
|
kfree(vaddr);
|
|
}
|
|
|
|
static dma_addr_t ibmebus_map_single(struct device *dev,
|
|
void *ptr,
|
|
size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
return (dma_addr_t)(ptr);
|
|
}
|
|
|
|
static void ibmebus_unmap_single(struct device *dev,
|
|
dma_addr_t dma_addr,
|
|
size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static int ibmebus_map_sg(struct device *dev,
|
|
struct scatterlist *sg,
|
|
int nents, enum dma_data_direction direction)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nents; i++) {
|
|
sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
|
|
+ sg[i].offset;
|
|
sg[i].dma_length = sg[i].length;
|
|
}
|
|
|
|
return nents;
|
|
}
|
|
|
|
static void ibmebus_unmap_sg(struct device *dev,
|
|
struct scatterlist *sg,
|
|
int nents, enum dma_data_direction direction)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static int ibmebus_dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
struct dma_mapping_ops ibmebus_dma_ops = {
|
|
.alloc_coherent = ibmebus_alloc_coherent,
|
|
.free_coherent = ibmebus_free_coherent,
|
|
.map_single = ibmebus_map_single,
|
|
.unmap_single = ibmebus_unmap_single,
|
|
.map_sg = ibmebus_map_sg,
|
|
.unmap_sg = ibmebus_unmap_sg,
|
|
.dma_supported = ibmebus_dma_supported,
|
|
};
|
|
|
|
static int ibmebus_bus_probe(struct device *dev)
|
|
{
|
|
struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
|
|
struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
|
|
const struct of_device_id *id;
|
|
int error = -ENODEV;
|
|
|
|
if (!ibmebusdrv->probe)
|
|
return error;
|
|
|
|
id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
|
|
if (id) {
|
|
error = ibmebusdrv->probe(ibmebusdev, id);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int ibmebus_bus_remove(struct device *dev)
|
|
{
|
|
struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
|
|
struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
|
|
|
|
if (ibmebusdrv->remove) {
|
|
return ibmebusdrv->remove(ibmebusdev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __devinit ibmebus_dev_release(struct device *dev)
|
|
{
|
|
of_node_put(to_ibmebus_dev(dev)->ofdev.node);
|
|
kfree(to_ibmebus_dev(dev));
|
|
}
|
|
|
|
static ssize_t ibmebusdev_show_name(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
|
|
}
|
|
static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name,
|
|
NULL);
|
|
|
|
static struct ibmebus_dev* __devinit ibmebus_register_device_common(
|
|
struct ibmebus_dev *dev, char *name)
|
|
{
|
|
int err = 0;
|
|
|
|
dev->name = name;
|
|
dev->ofdev.dev.parent = &ibmebus_bus_device.ofdev.dev;
|
|
dev->ofdev.dev.bus = &ibmebus_bus_type;
|
|
dev->ofdev.dev.release = ibmebus_dev_release;
|
|
|
|
/* An ibmebusdev is based on a of_device. We have to change the
|
|
* bus type to use our own DMA mapping operations.
|
|
*/
|
|
if ((err = of_device_register(&dev->ofdev)) != 0) {
|
|
printk(KERN_ERR "%s: failed to register device (%d).\n",
|
|
__FUNCTION__, err);
|
|
return NULL;
|
|
}
|
|
|
|
device_create_file(&dev->ofdev.dev, &dev_attr_name);
|
|
|
|
return dev;
|
|
}
|
|
|
|
static struct ibmebus_dev* __devinit ibmebus_register_device_node(
|
|
struct device_node *dn)
|
|
{
|
|
struct ibmebus_dev *dev;
|
|
char *loc_code;
|
|
int length;
|
|
|
|
loc_code = (char *)get_property(dn, "ibm,loc-code", NULL);
|
|
if (!loc_code) {
|
|
printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
|
|
__FUNCTION__, dn->name ? dn->name : "<unknown>");
|
|
return NULL;
|
|
}
|
|
|
|
if (strlen(loc_code) == 0) {
|
|
printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
|
|
__FUNCTION__);
|
|
return NULL;
|
|
}
|
|
|
|
dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
|
|
if (!dev) {
|
|
return NULL;
|
|
}
|
|
memset(dev, 0, sizeof(struct ibmebus_dev));
|
|
|
|
dev->ofdev.node = of_node_get(dn);
|
|
|
|
length = strlen(loc_code);
|
|
memcpy(dev->ofdev.dev.bus_id, loc_code
|
|
+ (length - min(length, BUS_ID_SIZE - 1)),
|
|
min(length, BUS_ID_SIZE - 1));
|
|
|
|
/* Register with generic device framework. */
|
|
if (ibmebus_register_device_common(dev, dn->name) == NULL) {
|
|
kfree(dev);
|
|
return NULL;
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
static void ibmebus_probe_of_nodes(char* name)
|
|
{
|
|
struct device_node *dn = NULL;
|
|
|
|
while ((dn = of_find_node_by_name(dn, name))) {
|
|
if (ibmebus_register_device_node(dn) == NULL) {
|
|
of_node_put(dn);
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
of_node_put(dn);
|
|
|
|
return;
|
|
}
|
|
|
|
static void ibmebus_add_devices_by_id(struct of_device_id *idt)
|
|
{
|
|
while (strlen(idt->name) > 0) {
|
|
ibmebus_probe_of_nodes(idt->name);
|
|
idt++;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static int ibmebus_match_helper(struct device *dev, void *data)
|
|
{
|
|
if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ibmebus_unregister_device(struct device *dev)
|
|
{
|
|
device_remove_file(dev, &dev_attr_name);
|
|
of_device_unregister(to_of_device(dev));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
|
|
{
|
|
struct device *dev;
|
|
|
|
while (strlen(idt->name) > 0) {
|
|
while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
|
|
(void*)idt->name,
|
|
ibmebus_match_helper))) {
|
|
ibmebus_unregister_device(dev);
|
|
}
|
|
idt++;
|
|
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
int ibmebus_register_driver(struct ibmebus_driver *drv)
|
|
{
|
|
int err = 0;
|
|
|
|
drv->driver.name = drv->name;
|
|
drv->driver.bus = &ibmebus_bus_type;
|
|
drv->driver.probe = ibmebus_bus_probe;
|
|
drv->driver.remove = ibmebus_bus_remove;
|
|
|
|
if ((err = driver_register(&drv->driver) != 0))
|
|
return err;
|
|
|
|
ibmebus_add_devices_by_id(drv->id_table);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ibmebus_register_driver);
|
|
|
|
void ibmebus_unregister_driver(struct ibmebus_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
ibmebus_remove_devices_by_id(drv->id_table);
|
|
}
|
|
EXPORT_SYMBOL(ibmebus_unregister_driver);
|
|
|
|
int ibmebus_request_irq(struct ibmebus_dev *dev,
|
|
u32 ist,
|
|
irqreturn_t (*handler)(int, void*, struct pt_regs *),
|
|
unsigned long irq_flags, const char * devname,
|
|
void *dev_id)
|
|
{
|
|
unsigned int irq = virt_irq_create_mapping(ist);
|
|
|
|
if (irq == NO_IRQ)
|
|
return -EINVAL;
|
|
|
|
irq = irq_offset_up(irq);
|
|
|
|
return request_irq(irq, handler,
|
|
irq_flags, devname, dev_id);
|
|
}
|
|
EXPORT_SYMBOL(ibmebus_request_irq);
|
|
|
|
void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
|
|
{
|
|
unsigned int irq = virt_irq_create_mapping(ist);
|
|
|
|
irq = irq_offset_up(irq);
|
|
free_irq(irq, dev_id);
|
|
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL(ibmebus_free_irq);
|
|
|
|
static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
|
|
struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv);
|
|
const struct of_device_id *ids = ebus_drv->id_table;
|
|
const struct of_device_id *found_id;
|
|
|
|
if (!ids)
|
|
return 0;
|
|
|
|
found_id = of_match_device(ids, &ebus_dev->ofdev);
|
|
if (found_id)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct bus_type ibmebus_bus_type = {
|
|
.name = "ibmebus",
|
|
.match = ibmebus_bus_match,
|
|
};
|
|
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",
|
|
__FUNCTION__);
|
|
return err;
|
|
}
|
|
|
|
err = device_register(&ibmebus_bus_device.ofdev.dev);
|
|
if (err) {
|
|
printk(KERN_WARNING "%s: device_register returned %i\n",
|
|
__FUNCTION__, err);
|
|
bus_unregister(&ibmebus_bus_type);
|
|
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
__initcall(ibmebus_bus_init);
|