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SPI Flash subsystem

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This adds a new SPI flash subsystem.

Currently, only AT45 DataFlash in non-power-of-two mode is supported,
but some preliminary support for other flash types is in place as
well.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen 2008-05-16 11:10:33 +02:00 • committed by Wolfgang Denk
parent 60445cb5c3
commit d25ce7d24c
6 changed files with 688 additions and 0 deletions
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70
include/spi_flash.h Normal file
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/*
* Interface to SPI flash
*
* Copyright (C) 2008 Atmel Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef _SPI_FLASH_H_
#define _SPI_FLASH_H_
#include <spi.h>
struct spi_flash_region {
unsigned int count;
unsigned int size;
};
struct spi_flash {
struct spi_slave *spi;
const char *name;
u32 size;
int (*read)(struct spi_flash *flash, u32 offset,
size_t len, void *buf);
int (*write)(struct spi_flash *flash, u32 offset,
size_t len, const void *buf);
int (*erase)(struct spi_flash *flash, u32 offset,
size_t len);
};
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int spi_mode);
void spi_flash_free(struct spi_flash *flash);
static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
size_t len, void *buf)
{
return flash->read(flash, offset, len, buf);
}
static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
size_t len, const void *buf)
{
return flash->write(flash, offset, len, buf);
}
static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
size_t len)
{
return flash->erase(flash, offset, len);
}
#endif /* _SPI_FLASH_H_ */