Commit 67bfc499 authored by Deepak Saxena's avatar Deepak Saxena

MTD driver for Intel IXP4xx platform (from MTD CVS tree)

Patch from Deepak Saxena <dsaxena@plexity.net>
parent 8081e9a1
......@@ -404,6 +404,15 @@ config MTD_IQ80310
IQ80310 evaluation board. If you have one of these boards and would
like to use the flash chips on it, say 'Y'.
config MTD_IXP4XX
tristate "CFI Flash device mapped on Intel IXP4xx based systems"
depends on ARM && MTD_CFI && MTD_COMPLEX_MAPPINGS && ARCH_IXP4XX
help
This eables MTD access to flash devices on platforms based
on Intel's IXP4xx family of network processors such as the
IXDP425 and Coyote. If you have an IXP4xx based board and
would like to use the flash chips on it, say 'Y'.
config MTD_EPXA10DB
tristate "CFI Flash device mapped on Epxa10db"
depends on ARM && MTD_CFI && MTD_PARTITIONS && ARCH_CAMELOT
......
......@@ -55,3 +55,4 @@ obj-$(CONFIG_MTD_EBONY) += ebony.o
obj-$(CONFIG_MTD_BEECH) += beech-mtd.o
obj-$(CONFIG_MTD_ARCTIC) += arctic-mtd.o
obj-$(CONFIG_MTD_H720X) += h720x-flash.o
obj-$(CONFIG_MTD_IXP4XX) += ixp4xx.o
/*
* $Id: ixp4xx.c,v 1.1 2004/05/13 22:21:26 dsaxena 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-types.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 __u16
ixp4xx_read16(struct map_info *map, unsigned long ofs)
{
return *(__u16 *) (map->map_priv_1 + ofs);
}
/*
* 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]);
}
static void
ixp4xx_write16(struct map_info *map, __u16 d, unsigned long adr)
{
*(__u16 *) (map->map_priv_1 + adr) = d;
}
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);
dev_set_drvdata(&dev->dev, NULL);
if(!info)
return 0;
/*
* This is required for a soft reboot to work.
*/
ixp4xx_write16(&info->map, 0xff, 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.buswidth = 2;
info->map.name = dev->dev.bus_id;
info->map.read16 = ixp4xx_read16,
info->map.write16 = ixp4xx_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 =
(unsigned long) 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;
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");
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