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/*
* arch/sh/kernel/cpu/bus.c
*
* Virtual bus for SuperH.
*
* Copyright (C) 2004 Paul Mundt
*
* Shamelessly cloned from arch/arm/mach-omap/bus.c, which was written
* by:
*
* Copyright (C) 2003 - 2004 Nokia Corporation
* Written by Tony Lindgren <tony@atomide.com>
* Portions of code based on sa1111.c.
*
* 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/kernel.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/module.h>
#include <asm/bus-sh.h>
static int sh_bus_match(struct device *dev, struct device_driver *drv)
{
struct sh_driver *shdrv = to_sh_driver(drv);
struct sh_dev *shdev = to_sh_dev(dev);
return shdev->dev_id == shdrv->dev_id;
}
static int sh_bus_suspend(struct device *dev, u32 state)
{
struct sh_dev *shdev = to_sh_dev(dev);
struct sh_driver *shdrv = to_sh_driver(dev->driver);
if (shdrv && shdrv->suspend)
return shdrv->suspend(shdev, state);
return 0;
}
static int sh_bus_resume(struct device *dev)
{
struct sh_dev *shdev = to_sh_dev(dev);
struct sh_driver *shdrv = to_sh_driver(dev->driver);
if (shdrv && shdrv->resume)
return shdrv->resume(shdev);
return 0;
}
static struct device sh_bus_devices[SH_NR_BUSES] = {
{
.bus_id = SH_BUS_NAME_VIRT,
},
};
struct bus_type sh_bus_types[SH_NR_BUSES] = {
{
.name = SH_BUS_NAME_VIRT,
.match = sh_bus_match,
.suspend = sh_bus_suspend,
.resume = sh_bus_resume,
},
};
static int sh_device_probe(struct device *dev)
{
struct sh_dev *shdev = to_sh_dev(dev);
struct sh_driver *shdrv = to_sh_driver(dev->driver);
if (shdrv && shdrv->probe)
return shdrv->probe(shdev);
return -ENODEV;
}
static int sh_device_remove(struct device *dev)
{
struct sh_dev *shdev = to_sh_dev(dev);
struct sh_driver *shdrv = to_sh_driver(dev->driver);
if (shdrv && shdrv->remove)
return shdrv->remove(shdev);
return 0;
}
int sh_device_register(struct sh_dev *dev)
{
if (!dev)
return -EINVAL;
if (dev->bus_id < 0 || dev->bus_id >= SH_NR_BUSES) {
printk(KERN_ERR "%s: bus_id invalid: %s bus: %d\n",
__FUNCTION__, dev->name, dev->bus_id);
return -EINVAL;
}
dev->dev.parent = &sh_bus_devices[dev->bus_id];
dev->dev.bus = &sh_bus_types[dev->bus_id];
/* This is needed for USB OHCI to work */
if (dev->dma_mask)
dev->dev.dma_mask = dev->dma_mask;
snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%s%u",
dev->name, dev->dev_id);
printk(KERN_INFO "Registering SH device '%s'. Parent at %s\n",
dev->dev.bus_id, dev->dev.parent->bus_id);
return device_register(&dev->dev);
}
void sh_device_unregister(struct sh_dev *dev)
{
device_unregister(&dev->dev);
}
int sh_driver_register(struct sh_driver *drv)
{
if (!drv)
return -EINVAL;
if (drv->bus_id < 0 || drv->bus_id >= SH_NR_BUSES) {
printk(KERN_ERR "%s: bus_id invalid: bus: %d device %d\n",
__FUNCTION__, drv->bus_id, drv->dev_id);
return -EINVAL;
}
drv->drv.probe = sh_device_probe;
drv->drv.remove = sh_device_remove;
drv->drv.bus = &sh_bus_types[drv->bus_id];
return driver_register(&drv->drv);
}
void sh_driver_unregister(struct sh_driver *drv)
{
driver_unregister(&drv->drv);
}
static int __init sh_bus_init(void)
{
int i, ret = 0;
for (i = 0; i < SH_NR_BUSES; i++) {
ret = device_register(&sh_bus_devices[i]);
if (ret != 0) {
printk(KERN_ERR "Unable to register bus device %s\n",
sh_bus_devices[i].bus_id);
continue;
}
ret = bus_register(&sh_bus_types[i]);
if (ret != 0) {
printk(KERN_ERR "Unable to register bus %s\n",
sh_bus_types[i].name);
device_unregister(&sh_bus_devices[i]);
}
}
printk(KERN_INFO "SH Virtual Bus initialized\n");
return ret;
}
static void __exit sh_bus_exit(void)
{
int i;
for (i = 0; i < SH_NR_BUSES; i++) {
bus_unregister(&sh_bus_types[i]);
device_unregister(&sh_bus_devices[i]);
}
}
module_init(sh_bus_init);
module_exit(sh_bus_exit);
MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
MODULE_DESCRIPTION("SH Virtual Bus");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(sh_bus_types);
EXPORT_SYMBOL(sh_device_register);
EXPORT_SYMBOL(sh_device_unregister);
EXPORT_SYMBOL(sh_driver_register);
EXPORT_SYMBOL(sh_driver_unregister);
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