169 lines
5.3 KiB
C
169 lines
5.3 KiB
C
/* $NetBSD: flash.h,v 1.3 2011/04/04 14:25:09 ahoka Exp $ */
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/*-
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* Copyright (c) 2011 Department of Software Engineering,
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* University of Szeged, Hungary
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* Copyright (c) 2011 Adam Hoka <ahoka@NetBSD.org>
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* Copyright (c) 2010 David Tengeri <dtengeri@inf.u-szeged.hu>
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by the Department of Software Engineering, University of Szeged, Hungary
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _FLASH_H_
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#define _FLASH_H_
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/module.h>
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#include <sys/buf.h>
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#include <sys/flashio.h>
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/**
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* flash_softc - private structure for flash layer driver
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*/
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struct flash_softc {
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device_t sc_dev;
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device_t sc_parent_dev; /* Hardware (parent) device */
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void *hw_softc; /* Hardware device private softc */
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struct flash_interface *flash_if; /* Hardware interface */
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bool sc_readonly; /* read only flash device */
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};
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struct flash_attach_args {
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struct flash_interface *flash_if; /* Hardware interface */
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};
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device_t flash_attach_mi(struct flash_interface *, device_t);
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const struct flash_interface *flash_get_interface(dev_t);
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const struct flash_softc *flash_get_softc(dev_t);
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device_t flash_get_device(dev_t);
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/**
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* struct erase_instruction - instructions to erase a flash eraseblock
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* @fd: flash descriptor
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* @addr: start address of the erase operation
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* @len: the erase length
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* @callback: callback operation, called when erase finished
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* @priv: private data
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* @state: the erase operation's result
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*/
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struct flash_erase_instruction {
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flash_off_t ei_addr;
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flash_off_t ei_len;
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void (*ei_callback)(struct flash_erase_instruction *);
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u_long ei_priv;
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u_char ei_state;
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};
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enum {
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FLASH_PART_READONLY = (1<<0),
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FLASH_PART_FILESYSTEM = (1<<2)
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};
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struct flash_partition {
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flash_off_t part_offset;
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flash_off_t part_size;
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int part_flags;
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};
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/**
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* struct flash_interface - interface for flash operations
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* @type: type of flash device
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* @size: size of flash
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* @page_size: page size of flash
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* @erasesize: erase size of flash
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* @writesize: minimum write size of flash
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* @minor: minor number of the character device attached to this driver
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* @erase: erase operation of the flash
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* @read: read operation of the flash
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* @write: write operation of the flash
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* @block_markbad: marks a block as bad on the flash
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* @block_isbad: checks if a block is bad on flash
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*/
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struct flash_interface {
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int (*erase)(device_t, struct flash_erase_instruction *);
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int (*read)(device_t, flash_off_t, size_t, size_t *, uint8_t *);
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int (*write)(device_t, flash_off_t, size_t, size_t *, const uint8_t *);
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int (*block_markbad)(device_t, flash_off_t);
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int (*block_isbad)(device_t, flash_off_t, bool *);
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int (*sync)(device_t);
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int (*submit)(device_t, struct buf *);
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/* storage for partition info */
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struct flash_partition partition;
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/* total size of mtd */
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flash_size_t size;
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uint32_t page_size;
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uint32_t erasesize;
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uint32_t writesize;
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uint32_t minor;
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uint8_t type;
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};
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/**
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* struct cache - for caching writes on block device
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*/
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struct flash_cache {
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size_t fc_len;
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flash_off_t fc_block;
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uint8_t *fc_data;
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};
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/* flash operations should be used through these */
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int flash_erase(device_t, struct flash_erase_instruction *);
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int flash_read(device_t, flash_off_t, size_t, size_t *, uint8_t *);
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int flash_write(device_t, flash_off_t, size_t, size_t *, const uint8_t *);
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int flash_block_markbad(device_t, flash_off_t);
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int flash_block_isbad(device_t, flash_off_t, bool *);
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int flash_sync(device_t);
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/*
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* check_pattern - checks the buffer only contains the byte pattern
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* @buf: the buffer to check
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* @patt: the pattern to match
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* @offset: the starting byte number, the matching starts from here
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* @size: the buffer size
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*
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* This functions checks if the buffer only contains a specified byte pattern.
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* Returns %0 if found something else, %1 otherwise.
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*/
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static inline int
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check_pattern(const void *buf, uint8_t patt, size_t offset, size_t size)
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{
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size_t i;
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for (i = offset; i < size; i++) {
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if (((const uint8_t *)buf)[i] != patt)
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return 0;
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}
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return 1;
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}
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#endif /* _FLASH_H_ */
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