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bb8215f437
Enable device tree control of SPI flash, and use this to implement memory-mapped SPI flash, which is supported on Intel chips. Signed-off-by: Simon Glass <sjg@chromium.org>
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
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* Interface to SPI flash
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*
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* Copyright (C) 2008 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef _SPI_FLASH_H_
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#define _SPI_FLASH_H_
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#include <spi.h>
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#include <linux/types.h>
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#include <linux/compiler.h>
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struct spi_flash {
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struct spi_slave *spi;
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const char *name;
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/* Total flash size */
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u32 size;
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/* Write (page) size */
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u32 page_size;
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/* Erase (sector) size */
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u32 sector_size;
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void *memory_map; /* Address of read-only SPI flash access */
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int (*read)(struct spi_flash *flash, u32 offset,
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size_t len, void *buf);
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int (*write)(struct spi_flash *flash, u32 offset,
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size_t len, const void *buf);
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int (*erase)(struct spi_flash *flash, u32 offset,
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size_t len);
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};
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/**
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* spi_flash_do_alloc - Allocate a new spi flash structure
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*
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* The structure is allocated and cleared with default values for
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* read, write and erase, which the caller can modify. The caller must set
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* up size, page_size and sector_size.
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*
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* Use the helper macro spi_flash_alloc() to call this.
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*
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* @offset: Offset of struct spi_slave within slave structure
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* @size: Size of slave structure
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* @spi: SPI slave
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* @name: Name of SPI flash device
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*/
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void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi,
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const char *name);
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/**
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* spi_flash_alloc - Allocate a new SPI flash structure
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*
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* @_struct: Name of structure to allocate (e.g. struct ramtron_spi_fram). This
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* structure must contain a member 'struct spi_flash *flash'.
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* @spi: SPI slave
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* @name: Name of SPI flash device
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*/
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#define spi_flash_alloc(_struct, spi, name) \
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spi_flash_do_alloc(offsetof(_struct, flash), sizeof(_struct), \
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spi, name)
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/**
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* spi_flash_alloc_base - Allocate a new SPI flash structure with no private data
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*
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* @spi: SPI slave
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* @name: Name of SPI flash device
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*/
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#define spi_flash_alloc_base(spi, name) \
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spi_flash_do_alloc(0, sizeof(struct spi_flash), spi, name)
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struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
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unsigned int max_hz, unsigned int spi_mode);
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void spi_flash_free(struct spi_flash *flash);
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static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
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size_t len, void *buf)
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{
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return flash->read(flash, offset, len, buf);
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}
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static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
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size_t len, const void *buf)
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{
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return flash->write(flash, offset, len, buf);
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}
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static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
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size_t len)
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{
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return flash->erase(flash, offset, len);
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}
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void spi_boot(void) __noreturn;
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#endif /* _SPI_FLASH_H_ */
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