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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>
#include <linux/types.h>
#include <linux/compiler.h>
struct spi_flash {
struct spi_slave *spi;
const char *name;
/* Total flash size */
u32 size;
/* Write (page) size */
u32 page_size;
/* Erase (sector) size */
u32 sector_size;
void *memory_map; /* Address of read-only SPI flash access */
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);
};
/**
* spi_flash_do_alloc - Allocate a new spi flash structure
*
* The structure is allocated and cleared with default values for
* read, write and erase, which the caller can modify. The caller must set
* up size, page_size and sector_size.
*
* Use the helper macro spi_flash_alloc() to call this.
*
* @offset: Offset of struct spi_slave within slave structure
* @size: Size of slave structure
* @spi: SPI slave
* @name: Name of SPI flash device
*/
void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi,
const char *name);
/**
* spi_flash_alloc - Allocate a new SPI flash structure
*
* @_struct: Name of structure to allocate (e.g. struct ramtron_spi_fram). This
* structure must contain a member 'struct spi_flash *flash'.
* @spi: SPI slave
* @name: Name of SPI flash device
*/
#define spi_flash_alloc(_struct, spi, name) \
spi_flash_do_alloc(offsetof(_struct, flash), sizeof(_struct), \
spi, name)
/**
* spi_flash_alloc_base - Allocate a new SPI flash structure with no private data
*
* @spi: SPI slave
* @name: Name of SPI flash device
*/
#define spi_flash_alloc_base(spi, name) \
spi_flash_do_alloc(0, sizeof(struct spi_flash), spi, name)
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);
}
void spi_boot(void) __noreturn;
#endif /* _SPI_FLASH_H_ */
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