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/**
* SPI Flash common control code.
* (C) 2006 Atmark Techno, Inc.
*/
#include <linux/init.h>
#include <linux/kernel.h>
//#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/gen_probe.h>
#include "spi_flash.h"
//#define MTD_SPI_DEBUG
#if defined(MTD_SPI_DEBUG)
#define KDEBUG(args...) printk(args)
#else
#define KDEBUG(args...)
#endif
// eric modified
#if 1
#else
extern int mtd_spi_erase(struct mtd_info *mtd, struct erase_info *instr);
extern int mtd_spi_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
extern int mtd_spi_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
extern void mtd_spi_sync(struct mtd_info *mtd);
extern int mtd_spi_lock(struct mtd_info *mtd, loff_t ofs, size_t len);
extern int mtd_spi_unlock(struct mtd_info *mtd, loff_t ofs, size_t len);
extern int mtd_spi_suspend(struct mtd_info *mtd);
extern void mtd_spi_resume(struct mtd_info *mtd);
#endif
int mtd_spi_erase(struct mtd_info *mtd, struct erase_info *instr)
{
struct map_info *map = mtd->priv;
struct spi_chip_info *chip_info = (struct spi_chip_info *)map->fldrv_priv;
unsigned long adr, len;
int ret = 0;
if (!chip_info->erase)
return -EOPNOTSUPP;
#if 0
// skip 1st block erase
if (instr->addr < (mtd->erasesize ))
{
instr->state = MTD_ERASE_DONE;
return 0;
}
#endif
if (instr->addr & (mtd->erasesize - 1))
return -EINVAL;
/*
if (instr->len & (mtd->erasesize -1))
return -EINVAL;
*/
if ((instr->len + instr->addr) > mtd->size)
return -EINVAL;
adr = instr->addr;
len = instr->len;
KDEBUG("mtd_spi_erase():: adr: 0x%08lx, len: 0x%08lx\n", adr, len);
if (len & (mtd->erasesize-1))
{
len = len - (len & (mtd->erasesize-1)) + mtd->erasesize;
}
if (len < mtd->erasesize)
len = mtd->erasesize;
while (len) {
ret = chip_info->erase(adr,chip_info->chip_select);
if (ret)
return ret;
adr += mtd->erasesize;
len -= mtd->erasesize;
}
instr->state = MTD_ERASE_DONE;
if (instr->callback)
instr->callback(instr);
return 0;
}
int mtd_spi_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
struct map_info *map = mtd->priv;
struct spi_chip_info *chip_info = (struct spi_chip_info *)map->fldrv_priv;
int ret = 0;
if (!chip_info->read)
return -EOPNOTSUPP;
KDEBUG("mtd_spi_read():: adr: 0x%08x, len: %08x, cs=%d\n", (u32)from, len, chip_info->chip_select);
ret = chip_info->read(from, (u32)buf, len, chip_info->chip_select);
if (ret)
return ret;
if(retlen)
(*retlen) = len;
return 0;
}
int mtd_spi_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
struct map_info *map = mtd->priv;
struct spi_chip_info *chip_info = (struct spi_chip_info *)map->fldrv_priv;
int ret = 0;
if (!chip_info->write)
return -EOPNOTSUPP;
KDEBUG(" mtd_spi_write():: adr: 0x%08x, len: 0x%08x, cs=%d\n", (u32)to, len, chip_info->chip_select);
ret = chip_info->write((u32)buf, to, len, chip_info->chip_select);
if (ret)
return ret;
if (retlen)
(*retlen) = len;
return 0;
}
void mtd_spi_sync(struct mtd_info *mtd)
{
/* Operation not supported on transport endpoint */
}
int mtd_spi_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
{
/* Operation not supported on transport endpoint */
return -EOPNOTSUPP;
}
int mtd_spi_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
{
/* Operation not supported on transport endpoint */
return -EOPNOTSUPP;
}
int mtd_spi_suspend(struct mtd_info *mtd)
{
/* Operation not supported on transport endpoint */
return -EOPNOTSUPP;
}
void mtd_spi_resume(struct mtd_info *mtd)
{
/* Operation not supported on transport endpoint */
}
EXPORT_SYMBOL(mtd_spi_erase);
EXPORT_SYMBOL(mtd_spi_read);
EXPORT_SYMBOL(mtd_spi_write);
EXPORT_SYMBOL(mtd_spi_sync);
EXPORT_SYMBOL(mtd_spi_lock);
EXPORT_SYMBOL(mtd_spi_unlock);
EXPORT_SYMBOL(mtd_spi_suspend);
EXPORT_SYMBOL(mtd_spi_resume);
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