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/*
* Interface to SPI flash
*
* Copyright (C) 2008 Atmel Corporation
*
* 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.
*/
#ifndef _SPI_FLASH_H_
#define _SPI_FLASH_H_
#include <stdint.h>
#include <stddef.h>
#include <spi-generic.h>
#include <boot/coreboot_tables.h>
/* SPI Flash opcodes */
#define SPI_OPCODE_WREN 0x06
#define SPI_OPCODE_FAST_READ 0x0b
struct spi_flash {
struct spi_slave spi;
const char *name;
u32 size;
u32 sector_size;
u8 erase_cmd;
u8 status_cmd;
/*
* Internal functions are expected to be called ONLY by spi flash
* driver. External components should only use the public API calls
* spi_flash_{read,write,erase,status,volatile_group_begin,
* volatile_group_end}.
*/
int (*internal_read)(const struct spi_flash *flash, u32 offset,
size_t len, void *buf);
int (*internal_write)(const struct spi_flash *flash, u32 offset,
size_t len, const void *buf);
int (*internal_erase)(const struct spi_flash *flash, u32 offset,
size_t len);
int (*internal_status)(const struct spi_flash *flash, u8 *reg);
};
void lb_spi_flash(struct lb_header *header);
/* SPI Flash Driver Public API */
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs);
/*
* Specialized probing performed by platform. This is a weak function which can
* be overriden by platform driver.
* spi = Pointer to spi_slave structure.
* force = Indicates if the platform driver can skip specialized probing.
*/
struct spi_flash *spi_flash_programmer_probe(struct spi_slave *spi, int force);
/* All the following functions return 0 on success and non-zero on error. */
int spi_flash_read(const struct spi_flash *flash, u32 offset, size_t len,
void *buf);
int spi_flash_write(const struct spi_flash *flash, u32 offset, size_t len,
const void *buf);
int spi_flash_erase(const struct spi_flash *flash, u32 offset, size_t len);
int spi_flash_status(const struct spi_flash *flash, u8 *reg);
/*
* Some SPI controllers require exclusive access to SPI flash when volatile
* operations like erase or write are being performed. In such cases,
* volatile_group_begin will gain exclusive access to SPI flash if not already
* acquired and volatile_group_end will end exclusive access if this was the
* last request in the group. spi_flash_{write,erase} operations call
* volatile_group_begin at the start of function and volatile_group_end after
* erase/write operation is performed. These functions can also be used by any
* components that wish to club multiple volatile operations into a single
* group.
*/
int spi_flash_volatile_group_begin(const struct spi_flash *flash);
int spi_flash_volatile_group_end(const struct spi_flash *flash);
/*
* These are callbacks for marking the start and end of volatile group as
* handled by the chipset. Not every chipset requires this special handling. So,
* these functions are expected to be implemented in Kconfig option for volatile
* group is enabled (SPI_FLASH_HAS_VOLATILE_GROUP).
*/
int chipset_volatile_group_begin(const struct spi_flash *flash);
int chipset_volatile_group_end(const struct spi_flash *flash);
/* Return spi_flash object reference for the boot device. This is only valid
* if CONFIG_BOOT_DEVICE_SPI_FLASH is enabled. */
const struct spi_flash *boot_device_spi_flash(void);
#endif /* _SPI_FLASH_H_ */
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