satip-axe/kernel/arch/sh/boards/mach-st/epld.c

77 lines
1.6 KiB
C
Raw Normal View History

/*
* Copyright (C) 2007 STMicroelectronics Limited
* Author: Stuart Menefy <stuart.menefy@st.com>
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <mach/common.h>
#define DRIVER_NAME "epld"
static void __iomem *epld_base;
static int epld_opsize;
void epld_write(unsigned long value, unsigned long offset)
{
if (epld_opsize == 16)
writew(value, epld_base + offset);
else
writeb(value, epld_base + offset);
}
unsigned long epld_read(unsigned long offset)
{
if (epld_opsize == 16)
return readw(epld_base + offset);
else
return readb(epld_base + offset);
}
void __init epld_early_init(struct platform_device *pdev)
{
int size = pdev->resource[0].end - pdev->resource[0].start + 1;
struct plat_epld_data *data = pdev->dev.platform_data;
epld_base = ioremap(pdev->resource[0].start, size);
if (!epld_base)
panic("Unable to ioremap EPLD");
if (data)
epld_opsize = data->opsize;
}
static int __init epld_probe(struct platform_device *pdev)
{
int size = pdev->resource[0].end - pdev->resource[0].start + 1;
if (!request_mem_region(pdev->resource[0].start, size, pdev->name))
return -EBUSY;
if (epld_base)
return 0;
epld_early_init(pdev);
return 0;
}
static struct platform_driver epld_driver = {
.probe = epld_probe,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
static int __init epld_init(void)
{
return platform_driver_register(&epld_driver);
}
arch_initcall(epld_init);