forked from xuos/xiuos
modify nuttx bug of lack of files
This commit is contained in:
TangYiwen123
@@ -0,0 +1,659 @@
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/****************************************************************************
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* drivers/mtd/sector512.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* MTD driver that contains another MTD driver and converts a larger sector
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* size to a standard 512 byte sector size.
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*/
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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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#include <inttypes.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/ioctl.h>
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#include <nuttx/mtd/mtd.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration */
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#ifndef CONFIG_MTD_SECT512_ERASED_STATE
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# define CONFIG_MTD_SECT512_ERASED_STATE 0xff
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#endif
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/* 512-byte sector constants */
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#define SECTOR_512 512
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#define SHIFT_512 9
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#define MASK_512 511
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/* Cache flags */
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#define SST25_CACHE_VALID (1 << 0) /* 1=Cache has valid data */
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#define SST25_CACHE_DIRTY (1 << 1) /* 1=Cache is dirty */
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#define SST25_CACHE_ERASED (1 << 2) /* 1=Backing FLASH is erased */
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#define IS_VALID(p) ((((p)->flags) & SST25_CACHE_VALID) != 0)
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#define IS_DIRTY(p) ((((p)->flags) & SST25_CACHE_DIRTY) != 0)
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#define IS_ERASED(p) ((((p)->flags) & SST25_CACHE_DIRTY) != 0)
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#define SET_VALID(p) do { (p)->flags |= SST25_CACHE_VALID; } while (0)
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#define SET_DIRTY(p) do { (p)->flags |= SST25_CACHE_DIRTY; } while (0)
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#define SET_ERASED(p) do { (p)->flags |= SST25_CACHE_DIRTY; } while (0)
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#define CLR_VALID(p) do { (p)->flags &= ~SST25_CACHE_VALID; } while (0)
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#define CLR_DIRTY(p) do { (p)->flags &= ~SST25_CACHE_DIRTY; } while (0)
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#define CLR_ERASED(p) do { (p)->flags &= ~SST25_CACHE_DIRTY; } while (0)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This type represents the state of the MTD device. The struct mtd_dev_s
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* must appear at the beginning of the definition so that you can freely
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* cast between pointers to struct mtd_dev_s and struct s512_dev_s.
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*/
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struct s512_dev_s
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{
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struct mtd_dev_s mtd; /* MTD interface */
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FAR struct mtd_dev_s *dev; /* Saved lower level MTD interface instance */
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uint32_t eblocksize; /* Size of one erase block */
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size_t neblocks; /* Number of erase blocks */
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size_t sectperblock; /* Number of read/write sectors per erase block */
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uint16_t stdperblock; /* Number of 512 byte sectors in one erase block */
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uint8_t flags; /* Buffered sector flags */
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uint32_t eblockno; /* Erase sector number in the cache */
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FAR uint8_t *eblock; /* Allocated erase block */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Helpers */
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static FAR uint8_t *s512_cacheread(struct s512_dev_s *priv, off_t sector);
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#ifndef CONFIG_MTD_SECT512_READONLY
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static void s512_cacheflush(struct s512_dev_s *priv);
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#endif
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/* MTD driver methods */
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static int s512_erase(FAR struct mtd_dev_s *dev,
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off_t sector512,
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size_t nsectors);
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static ssize_t s512_bread(FAR struct mtd_dev_s *dev,
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off_t sector512,
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size_t nsectors,
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FAR uint8_t *buf);
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static ssize_t s512_bwrite(FAR struct mtd_dev_s *dev,
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off_t sector512,
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size_t nsectors,
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FAR const uint8_t *buf);
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static ssize_t s512_read(FAR struct mtd_dev_s *dev,
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off_t offset,
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size_t nbytes,
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FAR uint8_t *buffer);
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static int s512_ioctl(FAR struct mtd_dev_s *dev,
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int cmd,
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unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: s512_cacheread
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****************************************************************************/
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static FAR uint8_t *s512_cacheread(struct s512_dev_s *priv, off_t sector512)
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{
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off_t eblockno;
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off_t sector;
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ssize_t result;
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int index;
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/* Get the erase block containing this sector */
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eblockno = sector512 / priv->stdperblock;
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finfo("sector512: %lu eblockno: %lu\n",
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(unsigned long)sector512, (unsigned long)eblockno);
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/* Check if the requested erase block is already in the cache */
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if (!IS_VALID(priv) || eblockno != priv->eblockno)
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{
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/* No.. Flush any dirty erase block currently in the cache */
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s512_cacheflush(priv);
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/* Read the erase block into the cache */
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sector = eblockno * priv->sectperblock;
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result = priv->dev->bread(priv->dev, sector, priv->sectperblock,
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priv->eblock);
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if (result < 0)
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{
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ferr("ERROR: bread(%lu, %lu) returned %ld\n",
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(unsigned long)sector, (unsigned long)priv->eblocksize,
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(long)result);
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return NULL;
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}
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/* Mark the sector as cached */
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priv->eblockno = eblockno;
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SET_VALID(priv); /* The data in the cache is valid */
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CLR_DIRTY(priv); /* It should match the FLASH contents */
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CLR_ERASED(priv); /* The underlying FLASH has not been erased */
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}
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/* Get the index to the 512 sector in the erase block that holds the
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* argument
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*/
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index = sector512 % priv->stdperblock;
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/* Return the address in the cache that holds this sector */
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return &priv->eblock[index << SHIFT_512];
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}
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/****************************************************************************
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* Name: s512_cacheflush
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****************************************************************************/
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#if !defined(CONFIG_MTD_SECT512_READONLY)
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static void s512_cacheflush(struct s512_dev_s *priv)
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{
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off_t sector;
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ssize_t result;
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/* If the cached is dirty (meaning that it no longer matches the old FLASH
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* contents) or was erased (with the cache containing the correct FLASH
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* contents), then write the cached erase block to FLASH.
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*/
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if (IS_DIRTY(priv) || IS_ERASED(priv))
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{
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/* Write entire erase block to FLASH */
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sector = priv->eblockno * priv->sectperblock;
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result = priv->dev->bwrite(priv->dev, sector, priv->sectperblock,
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priv->eblock);
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if (result < 0)
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{
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ferr("ERROR: bwrite(%lu, %lu) returned %ld\n",
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(unsigned long)sector, (unsigned long)priv->eblocksize,
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(long)result);
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return;
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}
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/* The cache is no long dirty and the FLASH is no longer erased */
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CLR_DIRTY(priv);
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CLR_ERASED(priv);
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}
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}
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#endif
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/****************************************************************************
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* Name: s512_erase
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****************************************************************************/
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static int s512_erase(FAR struct mtd_dev_s *dev,
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off_t sector512,
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size_t nsectors)
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{
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#ifdef CONFIG_MTD_SECT512_READONLY
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return -EACESS
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#else
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FAR struct s512_dev_s *priv = (FAR struct s512_dev_s *)dev;
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FAR uint8_t *dest;
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size_t sectorsleft = nsectors;
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size_t eblockno;
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int ret;
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finfo("sector512: %08jx nsectors: %zu\n", (intmax_t)sector512, nsectors);
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while (sectorsleft-- > 0)
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{
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/* Erase each sector. First, make sure that the erase block containing
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* the 512 byte sector is in the cache.
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*/
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dest = s512_cacheread(priv, sector512);
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if (!dest)
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{
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ferr("ERROR: s512_cacheread(%lu) failed\n",
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(unsigned long)sector512);
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DEBUGPANIC();
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return -EIO;
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}
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/* Erase the block containing this sector if it is not already erased.
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* The erased indicator will be cleared when the data from the erase
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* sector is read into the cache and set here when we erase the block.
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*/
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if (!IS_ERASED(priv))
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{
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eblockno = sector512 / priv->stdperblock;
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finfo("sector512: %lu eblockno: %lu\n",
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(unsigned long)sector512, (unsigned long)eblockno);
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ret = priv->dev->erase(priv->dev, eblockno, 1);
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if (ret < 0)
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{
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ferr("ERROR: Failed to erase block %lu: %d\n",
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(unsigned long)eblockno, ret);
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return ret;
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}
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SET_ERASED(priv);
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}
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/* Put the cached sector data into the erase state and mark the cache
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* as dirty (but don't update the FLASH yet. The caller will do that
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* at a more optimal time).
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*/
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memset(dest, CONFIG_MTD_SECT512_ERASED_STATE, SECTOR_512);
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SET_DIRTY(priv);
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sector512++;
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}
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/* Flush the last erase block left in the cache */
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s512_cacheflush(priv);
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return (int)nsectors;
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#endif
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}
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/****************************************************************************
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* Name: s512_bread
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****************************************************************************/
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static ssize_t s512_bread(FAR struct mtd_dev_s *dev, off_t sector512,
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size_t nsectors, FAR uint8_t *buffer)
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{
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FAR struct s512_dev_s *priv = (FAR struct s512_dev_s *)dev;
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FAR uint8_t *src;
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ssize_t remaining;
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ssize_t result = nsectors;
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finfo("sector512: %08lx nsectors: %d\n", (long)sector512, (int)nsectors);
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/* Read each 512 byte sector from the block via the erase block cache */
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for (remaining = nsectors; remaining; remaining--)
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{
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/* Make sure that the next sector is in the erase block cache */
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src = s512_cacheread(priv, sector512);
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if (!src)
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{
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ferr("ERROR: s512_cacheread(%lu) failed\n",
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(unsigned long)sector512);
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DEBUGPANIC();
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result = (ssize_t)nsectors - remaining;
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if (result <= 0)
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{
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result = -EIO;
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}
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break;
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}
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/* Copy the sector data from the erase block cache into the user
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* buffer
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*/
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memcpy(buffer, src, SECTOR_512);
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buffer += SECTOR_512;
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sector512++;
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}
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return result;
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}
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/****************************************************************************
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* Name: s512_bwrite
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****************************************************************************/
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static ssize_t s512_bwrite(FAR struct mtd_dev_s *dev, off_t sector512,
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size_t nsectors,
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FAR const uint8_t *buffer)
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{
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#ifdef CONFIG_MTD_SECT512_READONLY
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return -EACCESS;
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#else
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FAR struct s512_dev_s *priv = (FAR struct s512_dev_s *)dev;
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ssize_t remaining;
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ssize_t result;
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off_t eblockno;
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finfo("sector512: %08lx nsectors: %d\n", (long)sector512, (int)nsectors);
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FAR uint8_t *dest;
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for (remaining = nsectors; remaining > 0; remaining--)
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{
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/* First, make sure that the erase block containing 512 byte sector is
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* in memory.
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*/
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dest = s512_cacheread(priv, sector512);
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if (!dest)
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{
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result = (ssize_t)nsectors - remaining;
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if (result <= 0)
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{
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result = -EIO;
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}
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return result;
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}
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/* Erase the block containing this sector if it is not already erased.
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* The erased indicated will be cleared when the data from the erase
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* sector is read into the cache and set here when we erase the sector.
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*/
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if (!IS_ERASED(priv))
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{
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eblockno = sector512 / priv->stdperblock;
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finfo("sector512: %lu eblockno: %lu\n",
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(unsigned long)sector512, (unsigned long)eblockno);
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result = priv->dev->erase(priv->dev, eblockno, 1);
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if (result < 0)
|
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{
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ferr("ERROR: Failed to erase block %lu: %ld\n",
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(unsigned long)eblockno, (long)result);
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return result;
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}
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SET_ERASED(priv);
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}
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/* Copy the new sector data into cached erase block */
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memcpy(dest, buffer, SECTOR_512);
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SET_DIRTY(priv);
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/* Set up for the next 512 byte sector */
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buffer += SECTOR_512;
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sector512++;
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}
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/* Flush the last erase block left in the cache */
|
||||
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s512_cacheflush(priv);
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return nsectors;
|
||||
#endif
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: s512_read
|
||||
****************************************************************************/
|
||||
|
||||
static ssize_t s512_read(FAR struct mtd_dev_s *dev,
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off_t offset,
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size_t nbytes,
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FAR uint8_t *buffer)
|
||||
{
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||||
FAR struct s512_dev_s *priv = (FAR struct s512_dev_s *)dev;
|
||||
FAR uint8_t *src;
|
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ssize_t remaining;
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ssize_t xfrsize;
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||||
off_t sectoffset;
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off_t sector;
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finfo("offset: %08lx nbytes: %lu\n",
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(unsigned long)offset, (unsigned long)nbytes);
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||||
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/* Convert the offset into 512 byte sector address and a byte offset */
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sectoffset = offset & MASK_512;
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sector = offset >> SHIFT_512;
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||||
|
||||
for (remaining = nbytes; remaining > 0; remaining -= xfrsize)
|
||||
{
|
||||
/* Read the erase block into the cache and get the address of the
|
||||
* beginning of the 512 byte block in the cached erase block.
|
||||
*/
|
||||
|
||||
src = s512_cacheread(priv, sector);
|
||||
if (!src)
|
||||
{
|
||||
int result;
|
||||
|
||||
ferr("ERROR: s512_cacheread(%lu) failed\n", (unsigned long)sector);
|
||||
DEBUGPANIC();
|
||||
|
||||
result = (ssize_t)nbytes - remaining;
|
||||
if (result <= 0)
|
||||
{
|
||||
result = -EIO;
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
/* Then copy the requested bytes from the cached erase block */
|
||||
|
||||
xfrsize = remaining;
|
||||
if (sectoffset + xfrsize > SECTOR_512)
|
||||
{
|
||||
xfrsize = SECTOR_512 - sectoffset;
|
||||
}
|
||||
|
||||
memcpy(buffer, src + sectoffset, xfrsize);
|
||||
buffer += xfrsize;
|
||||
}
|
||||
|
||||
finfo("return nbytes: %d\n", (int)nbytes);
|
||||
return nbytes;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: s512_ioctl
|
||||
****************************************************************************/
|
||||
|
||||
static int s512_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
|
||||
{
|
||||
FAR struct s512_dev_s *priv = (FAR struct s512_dev_s *)dev;
|
||||
int ret = -EINVAL; /* Assume good command with bad parameters */
|
||||
|
||||
finfo("cmd: %d \n", cmd);
|
||||
|
||||
switch (cmd)
|
||||
{
|
||||
case MTDIOC_GEOMETRY:
|
||||
{
|
||||
FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)
|
||||
((uintptr_t)arg);
|
||||
if (geo)
|
||||
{
|
||||
/* Populate the geometry structure with information need to
|
||||
* know the capacity and how to access the device.
|
||||
*
|
||||
* NOTE:
|
||||
* that the device is treated as though it where just an
|
||||
* array of fixed size blocks. That is most likely not true,
|
||||
* but the client will expect the device logic to do whatever
|
||||
* is necessary to make it appear so.
|
||||
*/
|
||||
|
||||
geo->blocksize = SECTOR_512;
|
||||
geo->erasesize = SECTOR_512;
|
||||
geo->neraseblocks = priv->neblocks * priv->stdperblock;
|
||||
ret = OK;
|
||||
|
||||
finfo("blocksize: %" PRId32 " erasesize: %" PRId32
|
||||
" neraseblocks: %" PRId32 "\n",
|
||||
geo->blocksize, geo->erasesize, geo->neraseblocks);
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case MTDIOC_BULKERASE:
|
||||
{
|
||||
/* Erase the entire device */
|
||||
|
||||
ret = priv->dev->ioctl(priv->dev, MTDIOC_BULKERASE, 0);
|
||||
if (ret >= 0)
|
||||
{
|
||||
priv->flags = 0; /* Buffered sector flags */
|
||||
priv->eblockno = 0; /* Erase sector number in the cache */
|
||||
priv->eblock = NULL; /* Allocated erase block */
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case MTDIOC_XIPBASE:
|
||||
default:
|
||||
ret = -ENOTTY; /* Bad command */
|
||||
break;
|
||||
}
|
||||
|
||||
finfo("return %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: s512_initialize
|
||||
*
|
||||
* Description:
|
||||
* Create an initialized MTD device instance. This MTD driver contains
|
||||
* another MTD driver and converts a larger sector size to a standard 512
|
||||
* byte sector size.
|
||||
*
|
||||
* MTD devices are not registered in the file system, but are created as
|
||||
* instances that can be bound to other functions (such as a block or
|
||||
* character driver front end).
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct mtd_dev_s *s512_initialize(FAR struct mtd_dev_s *mtd)
|
||||
{
|
||||
FAR struct s512_dev_s *priv;
|
||||
FAR struct mtd_geometry_s geo;
|
||||
int ret;
|
||||
|
||||
finfo("mtd: %p\n", mtd);
|
||||
|
||||
/* Get the device geometry */
|
||||
|
||||
DEBUGASSERT(mtd && mtd->ioctl);
|
||||
ret = mtd->ioctl(mtd, MTDIOC_GEOMETRY, (unsigned long)((uintptr_t)&geo));
|
||||
|
||||
/* We expect that the block size will be >512 and an even multiple of 512 */
|
||||
|
||||
if (ret < 0 || geo.erasesize <= SECTOR_512 ||
|
||||
(geo.erasesize & ~MASK_512) != geo.erasesize)
|
||||
{
|
||||
ferr(
|
||||
"ERROR: MTDIOC_GEOMETRY ioctl returned %d, eraseize=%" PRId32 "\n",
|
||||
ret, geo.erasesize);
|
||||
DEBUGPANIC();
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Allocate a state structure (we allocate the structure instead of using
|
||||
* a fixed, static allocation so that we can handle multiple FLASH devices.
|
||||
* The current implementation would handle only one FLASH part per SPI
|
||||
* device (only because of the SPIDEV_FLASH(0) definition) and so would
|
||||
* have to be extended to handle multiple FLASH parts on the same SPI bus.
|
||||
*/
|
||||
|
||||
priv = (FAR struct s512_dev_s *)kmm_zalloc(sizeof(struct s512_dev_s));
|
||||
if (priv)
|
||||
{
|
||||
/* Initialize the allocated structure. (unsupported methods/fields
|
||||
* were already nullified by kmm_zalloc).
|
||||
*/
|
||||
|
||||
priv->mtd.erase = s512_erase;
|
||||
priv->mtd.bread = s512_bread;
|
||||
priv->mtd.bwrite = s512_bwrite;
|
||||
priv->mtd.read = s512_read;
|
||||
priv->mtd.ioctl = s512_ioctl;
|
||||
priv->mtd.name = "sector512";
|
||||
|
||||
priv->dev = mtd;
|
||||
priv->eblocksize = geo.erasesize;
|
||||
priv->neblocks = geo.neraseblocks;
|
||||
priv->sectperblock = geo.erasesize / geo.blocksize;
|
||||
priv->stdperblock = geo.erasesize >> 9;
|
||||
|
||||
/* Allocate a buffer for the erase block cache */
|
||||
|
||||
priv->eblock = (FAR uint8_t *)kmm_malloc(priv->eblocksize);
|
||||
if (!priv->eblock)
|
||||
{
|
||||
/* Allocation failed! Discard all of that work we just did and
|
||||
* return NULL
|
||||
*/
|
||||
|
||||
ferr("ERROR: Allocation failed\n");
|
||||
kmm_free(priv);
|
||||
priv = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
/* Return the implementation-specific state structure as the MTD device */
|
||||
|
||||
finfo("Return %p\n", priv);
|
||||
return &priv->mtd;
|
||||
}
|
||||
Reference in New Issue
Block a user