/*
* $Id: ixp4xx.c,v 1.7 2004/11/04 13:24:15 gleixner Exp $
*
* drivers/mtd/maps/ixp4xx.c
*
* MTD Map file for IXP4XX based systems. Please do not make per-board
* changes in here. If your board needs special setup, do it in your
* platform level code in arch/arm/mach-ixp4xx/board-setup.c
*
* Original Author: Intel Corporation
* Maintainer: Deepak Saxena <dsaxena@mvista.com>
*
* Copyright (C) 2002 Intel Corporation
* Copyright (C) 2003-2004 MontaVista Software, Inc.
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/mach/flash.h>
#include <linux/reboot.h>
#ifndef __ARMEB__
#define BYTE0(h) ((h) & 0xFF)
#define BYTE1(h) (((h) >> 8) & 0xFF)
#else
#define BYTE0(h) (((h) >> 8) & 0xFF)
#define BYTE1(h) ((h) & 0xFF)
#endif
static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
{
map_word val;
val.x[0] = *(__u16 *) (map->map_priv_1 + ofs);
return val;
}
/*
* The IXP4xx expansion bus only allows 16-bit wide acceses
* when attached to a 16-bit wide device (such as the 28F128J3A),
* so we can't just memcpy_fromio().
*/
static void ixp4xx_copy_from(struct map_info *map, void *to,
unsigned long from, ssize_t len)
{
int i;
u8 *dest = (u8 *) to;
u16 *src = (u16 *) (map->map_priv_1 + from);
u16 data;
for (i = 0; i < (len / 2); i++) {
data = src[i];
dest[i * 2] = BYTE0(data);
dest[i * 2 + 1] = BYTE1(data);
}
if (len & 1)
dest[len - 1] = BYTE0(src[i]);
}
/*
* Unaligned writes are ignored, causing the 8-bit
* probe to fail and proceed to the 16-bit probe (which succeeds).
*/
static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
{
if (!(adr & 1))
*(__u16 *) (map->map_priv_1 + adr) = d.x[0];
}
/*
* Fast write16 function without the probing check above
*/
static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
{
*(__u16 *) (map->map_priv_1 + adr) = d.x[0];
}
struct ixp4xx_flash_info {
struct mtd_info *mtd;
struct map_info map;
struct mtd_partition *partitions;
struct resource *res;
};
static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
static int ixp4xx_flash_remove(struct device *_dev)
{
struct platform_device *dev = to_platform_device(_dev);
struct flash_platform_data *plat = dev->dev.platform_data;
struct ixp4xx_flash_info *info = dev_get_drvdata(&dev->dev);
map_word d;
dev_set_drvdata(&dev->dev, NULL);
if(!info)
return 0;
/*
* This is required for a soft reboot to work.
*/
d.x[0] = 0xff;
ixp4xx_write16(&info->map, d, 0x55 * 0x2);
if (info->mtd) {
del_mtd_partitions(info->mtd);
map_destroy(info->mtd);
}
if (info->map.map_priv_1)
iounmap((void *) info->map.map_priv_1);
if (info->partitions)
kfree(info->partitions);
if (info->res) {
release_resource(info->res);
kfree(info->res);
}
if (plat->exit)
plat->exit();
/* Disable flash write */
*IXP4XX_EXP_CS0 &= ~IXP4XX_FLASH_WRITABLE;
return 0;
}
static int ixp4xx_flash_probe(struct device *_dev)
{
struct platform_device *dev = to_platform_device(_dev);
struct flash_platform_data *plat = dev->dev.platform_data;
struct ixp4xx_flash_info *info;
int err = -1;
if (!plat)
return -ENODEV;
if (plat->init) {
err = plat->init();
if (err)
return err;
}
info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
if(!info) {
err = -ENOMEM;
goto Error;
}
memzero(info, sizeof(struct ixp4xx_flash_info));
dev_set_drvdata(&dev->dev, info);
/*
* Enable flash write
* TODO: Move this out to board specific code
*/
*IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
/*
* Tell the MTD layer we're not 1:1 mapped so that it does
* not attempt to do a direct access on us.
*/
info->map.phys = NO_XIP;
info->map.size = dev->resource->end - dev->resource->start + 1;
/*
* We only support 16-bit accesses for now. If and when
* any board use 8-bit access, we'll fixup the driver to
* handle that.
*/
info->map.bankwidth = 2;
info->map.name = dev->dev.bus_id;
info->map.read = ixp4xx_read16,
info->map.write = ixp4xx_probe_write16,
info->map.copy_from = ixp4xx_copy_from,
info->res = request_mem_region(dev->resource->start,
dev->resource->end - dev->resource->start + 1,
"IXP4XXFlash");
if (!info->res) {
printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
err = -ENOMEM;
goto Error;
}
info->map.map_priv_1 = ioremap(dev->resource->start,
dev->resource->end - dev->resource->start + 1);
if (!info->map.map_priv_1) {
printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
err = -EIO;
goto Error;
}
info->mtd = do_map_probe(plat->map_name, &info->map);
if (!info->mtd) {
printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
err = -ENXIO;
goto Error;
}
info->mtd->owner = THIS_MODULE;
/* Use the fast version */
info->map.write = ixp4xx_write16,
err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
if (err > 0) {
err = add_mtd_partitions(info->mtd, info->partitions, err);
if(err)
printk(KERN_ERR "Could not parse partitions\n");
}
if (err)
goto Error;
return 0;
Error:
ixp4xx_flash_remove(_dev);
return err;
}
static struct device_driver ixp4xx_flash_driver = {
.name = "IXP4XX-Flash",
.bus = &platform_bus_type,
.probe = ixp4xx_flash_probe,
.remove = ixp4xx_flash_remove,
};
static int __init ixp4xx_flash_init(void)
{
return driver_register(&ixp4xx_flash_driver);
}
static void __exit ixp4xx_flash_exit(void)
{
driver_unregister(&ixp4xx_flash_driver);
}
module_init(ixp4xx_flash_init);
module_exit(ixp4xx_flash_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
MODULE_AUTHOR("Deepak Saxena");
