144 lines
5.4 KiB
C
144 lines
5.4 KiB
C
/****************************************************************************
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* include/nuttx/mtd.h
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* Memory Technology Device (MTD) interface
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS 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; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_MTD_H
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#define __INCLUDE_NUTTX_MTD_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/* Macros to hide implementation */
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#define MTD_ERASE(d,s,n) ((d)->erase ? (d)->erase(d,s,n) : (-ENOSYS))
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#define MTD_BREAD(d,s,n,b) ((d)->bread ? (d)->bread(d,s,n,b) : (-ENOSYS))
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#define MTD_READ(d,a,n,b) ((d)->read ? (d)->read(d,s,n,b) : (-ENOSYS))
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#define MTD_BWRITE(d,s,n,b)((d)->bwrite ? (d)->bwrite(d,s,n,b) : (-ENOSYS))
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#define MTD_IOCTL(d,c,a) ((d)->ioctl ? (d)->ioctl(d,c,a) : (-ENOSYS))
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* The following defines the geometry for the device. It treats the device
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* as though it where just an array of fixed size blocks. That is most likely
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* not true, but the client will expect the device logic to do whatever is
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* necessary to make it appear so.
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*/
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struct mtd_geometry_s
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{
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uint16 blocksize; /* Size of one read/write block */
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uint16 erasesize; /* Size of one erase blocks -- must be a multiple
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* of blocksize. */
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size_t neraseblocks; /* Number of erase blocks */
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};
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/* This structure defines the interface to a simple memory technology device.
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* It will likely need to be extended in the future to support more complex
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* devices.
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*/
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struct mtd_dev_s
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{
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/* The following methods operate on the MTD: */
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/* Erase the specified erase blocks */
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int (*erase)(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks);
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/* Read/write from the specified read/write blocks */
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ssize_t (*bread)(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
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FAR ubyte *buffer);
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ssize_t (*bwrite)(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
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FAR const ubyte *buffer);
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/* Some devices may support byte oriented read (optional). Byte-oriented
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* writing is inherently block oriented on most MTD devices and is not supported.
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* It is recommended that low-level drivers not support read() if it requires
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* buffering.
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*/
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ssize_t (*read)(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes,
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FAR ubyte *buffer);
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/* Support other, less frequently used commands:
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* - MTDIOC_GEOMETRY: Get MTD geometry
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* - MTDIOC_XIPBASE: Convert block to physical address for eXecute-In-Place
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* - MTDIOC_BULKERASE: Erase the entire device
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* (see include/nuttx/ioctl.h)
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*/
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int (*ioctl)(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg);
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* MTD drivers available in drivers/mtd */
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EXTERN FAR struct mtd_dev_s *m25p_initialize(FAR struct spi_dev_s *dev);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __INCLUDE_NUTTX_MTD_H */
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