![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
202 lines
5.3 KiB
C
202 lines
5.3 KiB
C
/*
|
|
* drivers/sh/superhyway/superhyway.c
|
|
*
|
|
* SuperHyway Bus Driver
|
|
*
|
|
* Copyright (C) 2004, 2005 Paul Mundt <lethal@linux-sh.org>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/list.h>
|
|
#include <linux/superhyway.h>
|
|
|
|
static int superhyway_devices;
|
|
|
|
static struct device superhyway_bus_device = {
|
|
.bus_id = "superhyway",
|
|
};
|
|
|
|
static void superhyway_device_release(struct device *dev)
|
|
{
|
|
kfree(to_superhyway_device(dev));
|
|
}
|
|
|
|
/**
|
|
* superhyway_add_device - Add a SuperHyway module
|
|
* @mod_id: Module ID (taken from MODULE.VCR.MOD_ID).
|
|
* @base: Physical address where module is mapped.
|
|
* @vcr: VCR value.
|
|
*
|
|
* This is responsible for adding a new SuperHyway module. This sets up a new
|
|
* struct superhyway_device for the module being added. Each one of @mod_id,
|
|
* @base, and @vcr are registered with the new device for further use
|
|
* elsewhere.
|
|
*
|
|
* Devices are initially added in the order that they are scanned (from the
|
|
* top-down of the memory map), and are assigned an ID based on the order that
|
|
* they are added. Any manual addition of a module will thus get the ID after
|
|
* the devices already discovered regardless of where it resides in memory.
|
|
*
|
|
* Further work can and should be done in superhyway_scan_bus(), to be sure
|
|
* that any new modules are properly discovered and subsequently registered.
|
|
*/
|
|
int superhyway_add_device(unsigned int mod_id, unsigned long base,
|
|
unsigned long long vcr)
|
|
{
|
|
struct superhyway_device *dev;
|
|
|
|
dev = kmalloc(sizeof(struct superhyway_device), GFP_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
memset(dev, 0, sizeof(struct superhyway_device));
|
|
|
|
dev->id.id = mod_id;
|
|
sprintf(dev->name, "SuperHyway device %04x", dev->id.id);
|
|
|
|
dev->vcr = *((struct vcr_info *)(&vcr));
|
|
dev->resource.name = dev->name;
|
|
dev->resource.start = base;
|
|
dev->resource.end = dev->resource.start + 0x01000000;
|
|
dev->dev.parent = &superhyway_bus_device;
|
|
dev->dev.bus = &superhyway_bus_type;
|
|
dev->dev.release = superhyway_device_release;
|
|
|
|
sprintf(dev->dev.bus_id, "%02x", superhyway_devices);
|
|
|
|
superhyway_devices++;
|
|
|
|
return device_register(&dev->dev);
|
|
}
|
|
|
|
static int __init superhyway_init(void)
|
|
{
|
|
device_register(&superhyway_bus_device);
|
|
return superhyway_scan_bus();
|
|
}
|
|
|
|
postcore_initcall(superhyway_init);
|
|
|
|
static const struct superhyway_device_id *
|
|
superhyway_match_id(const struct superhyway_device_id *ids,
|
|
struct superhyway_device *dev)
|
|
{
|
|
while (ids->id) {
|
|
if (ids->id == dev->id.id)
|
|
return ids;
|
|
|
|
ids++;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int superhyway_device_probe(struct device *dev)
|
|
{
|
|
struct superhyway_device *shyway_dev = to_superhyway_device(dev);
|
|
struct superhyway_driver *shyway_drv = to_superhyway_driver(dev->driver);
|
|
|
|
if (shyway_drv && shyway_drv->probe) {
|
|
const struct superhyway_device_id *id;
|
|
|
|
id = superhyway_match_id(shyway_drv->id_table, shyway_dev);
|
|
if (id)
|
|
return shyway_drv->probe(shyway_dev, id);
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int superhyway_device_remove(struct device *dev)
|
|
{
|
|
struct superhyway_device *shyway_dev = to_superhyway_device(dev);
|
|
struct superhyway_driver *shyway_drv = to_superhyway_driver(dev->driver);
|
|
|
|
if (shyway_drv && shyway_drv->remove) {
|
|
shyway_drv->remove(shyway_dev);
|
|
return 0;
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* superhyway_register_driver - Register a new SuperHyway driver
|
|
* @drv: SuperHyway driver to register.
|
|
*
|
|
* This registers the passed in @drv. Any devices matching the id table will
|
|
* automatically be populated and handed off to the driver's specified probe
|
|
* routine.
|
|
*/
|
|
int superhyway_register_driver(struct superhyway_driver *drv)
|
|
{
|
|
drv->drv.name = drv->name;
|
|
drv->drv.bus = &superhyway_bus_type;
|
|
drv->drv.probe = superhyway_device_probe;
|
|
drv->drv.remove = superhyway_device_remove;
|
|
|
|
return driver_register(&drv->drv);
|
|
}
|
|
|
|
/**
|
|
* superhyway_unregister_driver - Unregister a SuperHyway driver
|
|
* @drv: SuperHyway driver to unregister.
|
|
*
|
|
* This cleans up after superhyway_register_driver(), and should be invoked in
|
|
* the exit path of any module drivers.
|
|
*/
|
|
void superhyway_unregister_driver(struct superhyway_driver *drv)
|
|
{
|
|
driver_unregister(&drv->drv);
|
|
}
|
|
|
|
static int superhyway_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct superhyway_device *shyway_dev = to_superhyway_device(dev);
|
|
struct superhyway_driver *shyway_drv = to_superhyway_driver(drv);
|
|
const struct superhyway_device_id *ids = shyway_drv->id_table;
|
|
|
|
if (!ids)
|
|
return -EINVAL;
|
|
if (superhyway_match_id(ids, shyway_dev))
|
|
return 1;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
struct bus_type superhyway_bus_type = {
|
|
.name = "superhyway",
|
|
.match = superhyway_bus_match,
|
|
#ifdef CONFIG_SYSFS
|
|
.dev_attrs = superhyway_dev_attrs,
|
|
#endif
|
|
};
|
|
|
|
static int __init superhyway_bus_init(void)
|
|
{
|
|
return bus_register(&superhyway_bus_type);
|
|
}
|
|
|
|
static void __exit superhyway_bus_exit(void)
|
|
{
|
|
device_unregister(&superhyway_bus_device);
|
|
bus_unregister(&superhyway_bus_type);
|
|
}
|
|
|
|
core_initcall(superhyway_bus_init);
|
|
module_exit(superhyway_bus_exit);
|
|
|
|
EXPORT_SYMBOL(superhyway_bus_type);
|
|
EXPORT_SYMBOL(superhyway_add_device);
|
|
EXPORT_SYMBOL(superhyway_register_driver);
|
|
EXPORT_SYMBOL(superhyway_unregister_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|