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/* System Control Driver
*
* Based on linux driver by:
* Copyright (C) 2012 Freescale Semiconductor, Inc.
* Copyright (C) 2012 Linaro Ltd.
* Author: Dong Aisheng <dong.aisheng@linaro.org>
*
* 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 <io.h>
#include <init.h>
#include <common.h>
#include <driver.h>
#include <malloc.h>
#include <xfuncs.h>
#include <linux/err.h>
#include <mfd/syscon.h>
struct syscon {
void __iomem *base;
};
void __iomem *syscon_base_lookup_by_pdevname(const char *s)
{
struct syscon *syscon;
struct device_d *dev;
for_each_device(dev) {
if (!strcmp(dev_name(dev), s)) {
syscon = dev->priv;
return syscon->base;
}
}
return ERR_PTR(-ENODEV);
}
void __iomem *syscon_base_lookup_by_phandle(struct device_node *np,
const char *property)
{
struct device_node *node;
struct syscon *syscon;
struct device_d *dev;
node = of_parse_phandle(np, property, 0);
if (!node)
return ERR_PTR(-ENODEV);
dev = of_find_device_by_node(node);
if (!dev)
return ERR_PTR(-ENODEV);
syscon = dev->priv;
return syscon->base;
}
static int syscon_probe(struct device_d *dev)
{
struct syscon *syscon;
struct resource *res;
syscon = xzalloc(sizeof(struct syscon));
if (!syscon)
return -ENOMEM;
res = dev_get_resource(dev, IORESOURCE_MEM, 0);
if (!res) {
free(syscon);
return -ENOENT;
}
res = request_iomem_region(dev_name(dev), res->start, res->end);
if (!res) {
free(syscon);
return -EBUSY;
}
syscon->base = (void __iomem *)res->start;
dev->priv = syscon;
dev_dbg(dev, "map 0x%x-0x%x registered\n", res->start, res->end);
return 0;
}
static struct platform_device_id syscon_ids[] = {
{ "syscon", },
{ }
};
static struct of_device_id of_syscon_match[] = {
{ .compatible = "syscon" },
{ },
};
static struct driver_d syscon_driver = {
.name = "syscon",
.probe = syscon_probe,
.id_table = syscon_ids,
.of_compatible = DRV_OF_COMPAT(of_syscon_match),
};
static int __init syscon_init(void)
{
return platform_driver_register(&syscon_driver);
}
core_initcall(syscon_init);
MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
MODULE_DESCRIPTION("System Control driver");
MODULE_LICENSE("GPL v2");
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