273 lines
6.5 KiB
C
273 lines
6.5 KiB
C
/*
|
|
* drivers/mtd/maps/ixp2000.c
|
|
*
|
|
* Mapping for the Intel XScale IXP2000 based systems
|
|
*
|
|
* Copyright (C) 2002 Intel Corp.
|
|
* Copyright (C) 2003-2004 MontaVista Software, Inc.
|
|
*
|
|
* Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
|
|
* Maintainer: Deepak Saxena <dsaxena@plexity.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/device.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/partitions.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <mach/hardware.h>
|
|
#include <asm/mach/flash.h>
|
|
|
|
#include <linux/reboot.h>
|
|
|
|
struct ixp2000_flash_info {
|
|
struct mtd_info *mtd;
|
|
struct map_info map;
|
|
struct mtd_partition *partitions;
|
|
struct resource *res;
|
|
};
|
|
|
|
static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
|
|
{
|
|
unsigned long (*set_bank)(unsigned long) =
|
|
(unsigned long(*)(unsigned long))map->map_priv_2;
|
|
|
|
return (set_bank ? set_bank(ofs) : ofs);
|
|
}
|
|
|
|
#ifdef __ARMEB__
|
|
/*
|
|
* Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which
|
|
* causes the lower address bits to be XORed with 0x11 on 8 bit accesses
|
|
* and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
|
|
*/
|
|
static int erratum44_workaround = 0;
|
|
|
|
static inline unsigned long address_fix8_write(unsigned long addr)
|
|
{
|
|
if (erratum44_workaround) {
|
|
return (addr ^ 3);
|
|
}
|
|
return addr;
|
|
}
|
|
#else
|
|
|
|
#define address_fix8_write(x) (x)
|
|
#endif
|
|
|
|
static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
|
|
{
|
|
map_word val;
|
|
|
|
val.x[0] = *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs)));
|
|
return val;
|
|
}
|
|
|
|
/*
|
|
* We can't use the standard memcpy due to the broken SlowPort
|
|
* address translation on rev A0 and A1 silicon and the fact that
|
|
* we have banked flash.
|
|
*/
|
|
static void ixp2000_flash_copy_from(struct map_info *map, void *to,
|
|
unsigned long from, ssize_t len)
|
|
{
|
|
from = flash_bank_setup(map, from);
|
|
while(len--)
|
|
*(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++);
|
|
}
|
|
|
|
static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
|
|
{
|
|
*(__u8 *) (address_fix8_write(map->map_priv_1 +
|
|
flash_bank_setup(map, ofs))) = d.x[0];
|
|
}
|
|
|
|
static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
|
|
const void *from, ssize_t len)
|
|
{
|
|
to = flash_bank_setup(map, to);
|
|
while(len--) {
|
|
unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
|
|
*(__u8 *)(tmp) = *(__u8 *)(from++);
|
|
}
|
|
}
|
|
|
|
|
|
static int ixp2000_flash_remove(struct platform_device *dev)
|
|
{
|
|
struct flash_platform_data *plat = dev->dev.platform_data;
|
|
struct ixp2000_flash_info *info = platform_get_drvdata(dev);
|
|
|
|
platform_set_drvdata(dev, NULL);
|
|
|
|
if(!info)
|
|
return 0;
|
|
|
|
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);
|
|
|
|
kfree(info->partitions);
|
|
|
|
if (info->res) {
|
|
release_resource(info->res);
|
|
kfree(info->res);
|
|
}
|
|
|
|
if (plat->exit)
|
|
plat->exit();
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int ixp2000_flash_probe(struct platform_device *dev)
|
|
{
|
|
static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
|
|
struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
|
|
struct flash_platform_data *plat;
|
|
struct ixp2000_flash_info *info;
|
|
unsigned long window_size;
|
|
int err = -1;
|
|
|
|
if (!ixp_data)
|
|
return -ENODEV;
|
|
|
|
plat = ixp_data->platform_data;
|
|
if (!plat)
|
|
return -ENODEV;
|
|
|
|
window_size = dev->resource->end - dev->resource->start + 1;
|
|
dev_info(&dev->dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n",
|
|
ixp_data->nr_banks, ((u32)window_size >> 20));
|
|
|
|
if (plat->width != 1) {
|
|
dev_err(&dev->dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
|
|
plat->width * 8);
|
|
return -EIO;
|
|
}
|
|
|
|
info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
|
|
if(!info) {
|
|
err = -ENOMEM;
|
|
goto Error;
|
|
}
|
|
memzero(info, sizeof(struct ixp2000_flash_info));
|
|
|
|
platform_set_drvdata(dev, info);
|
|
|
|
/*
|
|
* 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 = ixp_data->nr_banks * window_size;
|
|
info->map.bankwidth = 1;
|
|
|
|
/*
|
|
* map_priv_2 is used to store a ptr to to the bank_setup routine
|
|
*/
|
|
info->map.map_priv_2 = (unsigned long) ixp_data->bank_setup;
|
|
|
|
info->map.name = dev->dev.bus_id;
|
|
info->map.read = ixp2000_flash_read8;
|
|
info->map.write = ixp2000_flash_write8;
|
|
info->map.copy_from = ixp2000_flash_copy_from;
|
|
info->map.copy_to = ixp2000_flash_copy_to;
|
|
|
|
info->res = request_mem_region(dev->resource->start,
|
|
dev->resource->end - dev->resource->start + 1,
|
|
dev->dev.bus_id);
|
|
if (!info->res) {
|
|
dev_err(&dev->dev, "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) {
|
|
dev_err(&dev->dev, "Failed to ioremap flash region\n");
|
|
err = -EIO;
|
|
goto Error;
|
|
}
|
|
|
|
#if defined(__ARMEB__)
|
|
/*
|
|
* Enable erratum 44 workaround for NPUs with broken slowport
|
|
*/
|
|
|
|
erratum44_workaround = ixp2000_has_broken_slowport();
|
|
dev_info(&dev->dev, "Erratum 44 workaround %s\n",
|
|
erratum44_workaround ? "enabled" : "disabled");
|
|
#endif
|
|
|
|
info->mtd = do_map_probe(plat->map_name, &info->map);
|
|
if (!info->mtd) {
|
|
dev_err(&dev->dev, "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)
|
|
dev_err(&dev->dev, "Could not parse partitions\n");
|
|
}
|
|
|
|
if (err)
|
|
goto Error;
|
|
|
|
return 0;
|
|
|
|
Error:
|
|
ixp2000_flash_remove(dev);
|
|
return err;
|
|
}
|
|
|
|
static struct platform_driver ixp2000_flash_driver = {
|
|
.probe = ixp2000_flash_probe,
|
|
.remove = ixp2000_flash_remove,
|
|
.driver = {
|
|
.name = "IXP2000-Flash",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init ixp2000_flash_init(void)
|
|
{
|
|
return platform_driver_register(&ixp2000_flash_driver);
|
|
}
|
|
|
|
static void __exit ixp2000_flash_exit(void)
|
|
{
|
|
platform_driver_unregister(&ixp2000_flash_driver);
|
|
}
|
|
|
|
module_init(ixp2000_flash_init);
|
|
module_exit(ixp2000_flash_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
|
|
MODULE_ALIAS("platform:IXP2000-Flash");
|