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openwrt-xburst/target/linux/ar71xx/files/drivers/mtd/maps/ar91xx_flash.c

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/*
* Parallel flash driver for the Atheros AR91xx SoC
*
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/slab.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 <linux/io.h>
#include <asm/mach-ar71xx/ar71xx.h>
#include <asm/mach-ar71xx/ar91xx_flash.h>
#define DRV_NAME "ar91xx-flash"
struct ar91xx_flash_info {
struct mtd_info *mtd;
struct map_info map;
#ifdef CONFIG_MTD_PARTITIONS
int nr_parts;
struct mtd_partition *parts;
#endif
};
static map_word ar91xx_flash_read(struct map_info *map, unsigned long ofs)
{
map_word val;
if (map_bankwidth_is_1(map))
val.x[0] = __raw_readb(map->virt + (ofs ^ 3));
else if (map_bankwidth_is_2(map))
val.x[0] = __raw_readw(map->virt + (ofs ^ 2));
else
val = map_word_ff(map);
return val;
}
static void ar91xx_flash_write(struct map_info *map, map_word d,
unsigned long ofs)
{
if (map_bankwidth_is_1(map))
__raw_writeb(d.x[0], map->virt + (ofs ^ 3));
else if (map_bankwidth_is_2(map))
__raw_writew(d.x[0], map->virt + (ofs ^ 2));
mb();
}
static map_word ar91xx_flash_read_lock(struct map_info *map, unsigned long ofs)
{
map_word ret;
ar71xx_flash_acquire();
ret = ar91xx_flash_read(map, ofs);
ar71xx_flash_release();
return ret;
}
static void ar91xx_flash_write_lock(struct map_info *map, map_word d,
unsigned long ofs)
{
ar71xx_flash_acquire();
ar91xx_flash_write(map, d, ofs);
ar71xx_flash_release();
}
static void ar91xx_flash_copy_from_lock(struct map_info *map, void *to,
unsigned long from, ssize_t len)
{
ar71xx_flash_acquire();
inline_map_copy_from(map, to, from, len);
ar71xx_flash_release();
}
static void ar91xx_flash_copy_to_lock(struct map_info *map, unsigned long to,
const void *from, ssize_t len)
{
ar71xx_flash_acquire();
inline_map_copy_to(map, to, from, len);
ar71xx_flash_release();
}
static int ar91xx_flash_remove(struct platform_device *pdev)
{
struct ar91xx_flash_platform_data *pdata;
struct ar91xx_flash_info *info;
info = platform_get_drvdata(pdev);
if (info == NULL)
return 0;
platform_set_drvdata(pdev, NULL);
if (info->mtd == NULL)
return 0;
pdata = pdev->dev.platform_data;
#ifdef CONFIG_MTD_PARTITIONS
if (info->nr_parts) {
del_mtd_partitions(info->mtd);
kfree(info->parts);
} else if (pdata->nr_parts) {
del_mtd_partitions(info->mtd);
} else {
del_mtd_device(info->mtd);
}
#else
del_mtd_device(info->mtd);
#endif
map_destroy(info->mtd);
return 0;
}
static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
#endif
static int ar91xx_flash_probe(struct platform_device *pdev)
{
struct ar91xx_flash_platform_data *pdata;
struct ar91xx_flash_info *info;
struct resource *res;
struct resource *region;
const char **probe_type;
int err = 0;
pdata = pdev->dev.platform_data;
if (pdata == NULL)
return -EINVAL;
info = devm_kzalloc(&pdev->dev, sizeof(struct ar91xx_flash_info),
GFP_KERNEL);
if (info == NULL) {
err = -ENOMEM;
goto err_out;
}
platform_set_drvdata(pdev, info);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
err = -ENOENT;
goto err_out;
}
dev_info(&pdev->dev, "%.8llx at %.8llx\n",
(unsigned long long)(res->end - res->start + 1),
(unsigned long long)res->start);
region = devm_request_mem_region(&pdev->dev,
res->start, res->end - res->start + 1,
dev_name(&pdev->dev));
if (region == NULL) {
dev_err(&pdev->dev, "could not reserve memory region\n");
err = -ENOMEM;
goto err_out;
}
info->map.name = dev_name(&pdev->dev);
info->map.phys = res->start;
info->map.size = res->end - res->start + 1;
info->map.bankwidth = pdata->width;
info->map.virt = devm_ioremap(&pdev->dev, info->map.phys,
info->map.size);
if (info->map.virt == NULL) {
dev_err(&pdev->dev, "failed to ioremap flash region\n");
err = -EIO;
goto err_out;
}
simple_map_init(&info->map);
if (pdata->is_shared) {
info->map.read = ar91xx_flash_read_lock;
info->map.write = ar91xx_flash_write_lock;
info->map.copy_from = ar91xx_flash_copy_from_lock;
info->map.copy_to = ar91xx_flash_copy_to_lock;
} else {
info->map.read = ar91xx_flash_read;
info->map.write = ar91xx_flash_write;
}
probe_type = rom_probe_types;
for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
info->mtd = do_map_probe(*probe_type, &info->map);
if (info->mtd == NULL) {
dev_err(&pdev->dev, "map_probe failed\n");
err = -ENXIO;
goto err_out;
}
info->mtd->owner = THIS_MODULE;
#ifdef CONFIG_MTD_PARTITIONS
if (pdata->nr_parts) {
dev_info(&pdev->dev, "using static partition mapping\n");
add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
return 0;
}
err = parse_mtd_partitions(info->mtd, part_probe_types,
&info->parts, 0);
if (err > 0) {
add_mtd_partitions(info->mtd, info->parts, err);
return 0;
}
#endif
add_mtd_device(info->mtd);
return 0;
err_out:
ar91xx_flash_remove(pdev);
return err;
}
#ifdef CONFIG_PM
static int ar91xx_flash_suspend(struct platform_device *dev, pm_message_t state)
{
struct ar91xx_flash_info *info = platform_get_drvdata(dev);
int ret = 0;
if (info->mtd->suspend)
ret = info->mtd->suspend(info->mtd);
if (ret)
goto fail;
return 0;
fail:
if (info->mtd->suspend) {
BUG_ON(!info->mtd->resume);
info->mtd->resume(info->mtd);
}
return ret;
}
static int ar91xx_flash_resume(struct platform_device *pdev)
{
struct ar91xx_flash_info *info = platform_get_drvdata(pdev);
if (info->mtd->resume)
info->mtd->resume(info->mtd);
return 0;
}
static void ar91xx_flash_shutdown(struct platform_device *pdev)
{
struct ar91xx_flash_info *info = platform_get_drvdata(pdev);
if (info->mtd->suspend && info->mtd->resume)
if (info->mtd->suspend(info->mtd) == 0)
info->mtd->resume(info->mtd);
}
#else
#define ar91xx_flash_suspend NULL
#define ar91xx_flash_resume NULL
#define ar91xx_flash_shutdown NULL
#endif
static struct platform_driver ar91xx_flash_driver = {
.probe = ar91xx_flash_probe,
.remove = ar91xx_flash_remove,
.suspend = ar91xx_flash_suspend,
.resume = ar91xx_flash_resume,
.shutdown = ar91xx_flash_shutdown,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
static int __init ar91xx_flash_init(void)
{
return platform_driver_register(&ar91xx_flash_driver);
}
static void __exit ar91xx_flash_exit(void)
{
platform_driver_unregister(&ar91xx_flash_driver);
}
module_init(ar91xx_flash_init);
module_exit(ar91xx_flash_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_DESCRIPTION("Parallel flash driver for the Atheros AR91xx SoC");
MODULE_ALIAS("platform:" DRV_NAME);