More NAND stuff
This commit is contained in:
Gregory Nutt
parent
76e380d587
commit
3c4182115d
@ -76,8 +76,7 @@
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/* This type represents the state of the raw NAND MTD device. The struct
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* nand_raw_s must appear at the beginning of the definition so that you can
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* freely cast between pointers to struct mtd_dev_s, struct nand_raw_s, and
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* struct sam_rawnand_s.
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* freely cast between pointers to struct nand_raw_s and struct sam_rawnand_s.
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*/
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struct sam_rawnand_s
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@ -92,14 +91,11 @@ struct sam_rawnand_s
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/* MTD driver methods */
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static int nand_erase(struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks);
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static ssize_t nand_bread(struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, uint8_t *buf);
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static ssize_t nand_bwrite(struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, const uint8_t *buf);
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static int nand_ioctl(struct mtd_dev_s *dev, int cmd,
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unsigned long arg);
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static int nand_eraseblock(struct nand_raw_s *raw, off_t block);
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static int nand_readpage(struct nand_raw_s *raw, off_t block,
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unsigned int page, void *data, void *spare);
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static int nand_writepage(struct nand_raw_s *raw, off_t block,
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unsigned int page, const void *data, const void *spare);
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/****************************************************************************
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* Private Data
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@ -126,129 +122,82 @@ static struct sam_rawnand_s g_cs3nand;
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****************************************************************************/
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/****************************************************************************
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* Name: nand_erase
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* Name: nand_eraseblock
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*
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* Description:
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* Erase several blocks, each of the size previously reported.
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* Erases the specified block of the device.
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*
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* Input parameters:
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* raw - Lower-half, raw NAND FLASH interface
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* block - Number of the physical block to erase.
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*
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* Returned value.
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* OK is returned in succes; a negated errno value is returned on failure.
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*
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****************************************************************************/
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static int nand_erase(struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks)
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static int nand_eraseblock(struct nand_raw_s *raw, off_t block)
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{
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struct sam_rawnand_s *priv = (struct sam_rawnand_s *)dev;
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/* The interface definition assumes that all erase blocks are the same size.
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* If that is not true for this particular device, then transform the
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* start block and nblocks as necessary.
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*/
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struct sam_rawnand_s *priv = (struct sam_rawnand_s *)raw;
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DEBUGASSERT(raw);
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#warning Missing logic
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/* Erase the specified blocks and return status (OK or a negated errno) */
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return OK;
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return -ENOSYS;
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}
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/****************************************************************************
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* Name: nand_bread
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* Name: nand_readpage
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*
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* Description:
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* Read the specified number of blocks into the user provided buffer.
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* Reads the data and/or the spare areas of a page of a NAND FLASH into the
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* provided buffers.
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*
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* Input parameters:
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* raw - Lower-half, raw NAND FLASH interface
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* block - Number of the block where the page to read resides.
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* page - Number of the page to read inside the given block.
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* data - Buffer where the data area will be stored.
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* spare - Buffer where the spare area will be stored.
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*
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* Returned value.
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* OK is returned in succes; a negated errno value is returned on failure.
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*
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****************************************************************************/
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static ssize_t nand_bread(struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, uint8_t *buf)
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static int nand_readpage(struct nand_raw_s *raw, off_t block,
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unsigned int page, void *data, void *spare)
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{
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struct sam_rawnand_s *priv = (struct sam_rawnand_s *)dev;
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/* The interface definition assumes that all read/write blocks are the same size.
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* If that is not true for this particular device, then transform the
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* start block and nblocks as necessary.
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*/
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/* Read the specified blocks into the provided user buffer and return status
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* (The positive, number of blocks actually read or a negated errno).
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*/
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struct sam_rawnand_s *priv = (struct sam_rawnand_s *)raw;
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DEBUGASSERT(raw);
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#warning Missing logic
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return 0;
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return -ENOSYS;
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}
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/****************************************************************************
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* Name: nand_bwrite
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* Name: nand_writepage
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*
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* Description:
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* Write the specified number of blocks from the user provided buffer.
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* Writes the data and/or the spare area of a page on a NAND FLASH chip.
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*
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* Input parameters:
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* raw - Lower-half, raw NAND FLASH interface
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* block - Number of the block where the page to write resides.
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* page - Number of the page to write inside the given block.
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* data - Buffer containing the data to be writting
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* spare - Buffer conatining the spare data to be written.
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*
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* Returned value.
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* OK is returned in succes; a negated errno value is returned on failure.
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*
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****************************************************************************/
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static ssize_t nand_bwrite(struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, const uint8_t *buf)
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static int nand_writepage(struct nand_raw_s *raw, off_t block,
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unsigned int page, const void *data,
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const void *spare)
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{
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struct sam_rawnand_s *priv = (struct sam_rawnand_s *)dev;
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/* The interface definition assumes that all read/write blocks are the same size.
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* If that is not true for this particular device, then transform the
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* start block and nblocks as necessary.
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*/
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/* Write the specified blocks from the provided user buffer and return status
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* (The positive, number of blocks actually written or a negated errno)
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*/
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struct sam_rawnand_s *priv = (struct sam_rawnand_s *)raw;
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DEBUGASSERT(raw);
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#warning Missing logic
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return 0;
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}
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/****************************************************************************
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* Name: nand_ioctl
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****************************************************************************/
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static int nand_ioctl(struct mtd_dev_s *dev, int cmd, unsigned long arg)
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{
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struct sam_rawnand_s *priv = (struct sam_rawnand_s *)dev;
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int ret = -EINVAL; /* Assume good command with bad parameters */
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switch (cmd)
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{
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case MTDIOC_GEOMETRY:
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{
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struct mtd_geometry_s *geo = (struct mtd_geometry_s *)arg;
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if (geo)
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{
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/* Populate the geometry structure with information needed to know
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* the capacity and how to access the device.
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*
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* NOTE: that the device is treated as though it where just an array
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* of fixed size blocks. That is most likely not true, but the client
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* will expect the device logic to do whatever is necessary to make it
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* appear so.
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*/
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geo->blocksize = 512; /* Size of one read/write block */
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geo->erasesize = 4096; /* Size of one erase block */
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geo->neraseblocks = 1024; /* Number of erase blocks */
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ret = OK;
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}
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}
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break;
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case MTDIOC_BULKERASE:
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{
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/* Erase the entire device */
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ret = OK;
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}
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break;
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case MTDIOC_XIPBASE:
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default:
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ret = -ENOTTY; /* Bad command */
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break;
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}
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return ret;
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return -ENOSYS;
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}
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/****************************************************************************
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@ -259,14 +208,10 @@ static int nand_ioctl(struct mtd_dev_s *dev, int cmd, unsigned long arg)
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* Name: sam_nand_initialize
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*
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* Description:
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* Create and initialize an NAND MTD device instance. MTD devices are
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* not registered in the file system, but are created as instances that can
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* be bound to other functions (such as a block or character driver front
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* end).
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*
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* This MTD devices implements a RAW NAND interface: No ECC or sparing is
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* Create and initialize an raw NAND device instance. This driver
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* implements the RAW NAND interface: No software ECC or sparing is
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* performed here. Those necessary NAND features are provided by common,
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* higher level MTD layers found in drivers/mtd.
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* higher level NAND MTD layers found in drivers/mtd.
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*
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* Input parameters:
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* cs - Chip select number (in the event that multiple NAND devices
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@ -366,13 +311,12 @@ struct mtd_dev_s *sam_nand_initialize(int cs)
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/* Initialize the device structure */
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memset(priv, 0, sizeof(struct sam_rawnand_s));
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priv->raw.mtd.erase = nand_erase;
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priv->raw.mtd.bread = nand_bread;
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priv->raw.mtd.bwrite = nand_bwrite;
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priv->raw.mtd.ioctl = nand_ioctl;
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priv->raw.cmdaddr = cmdaddr;
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priv->raw.addraddr = addraddr;
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priv->raw.dataaddr = dataaddr;
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priv->raw.eraseblock = nand_eraseblock;
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priv->raw.readpage = nand_readpage;
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priv->raw.writepage = nand_writepage;
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priv->cs = cs;
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/* Initialize the NAND hardware */
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@ -67,19 +67,15 @@ extern "C" {
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* Name: sam_nand_initialize
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*
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* Description:
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* Create and initialize a raw NAND MTD device instance. MTD devices are
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* not registered in the file system, but are created as instances that can
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* be bound to other functions (such as a block or character driver front
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* end).
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*
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* This MTD devices implements a RAW NAND interface: No ECC or sparing is
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* Create and initialize an raw NAND device instance. This driver
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* implements the RAW NAND interface: No software ECC or sparing is
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* performed here. Those necessary NAND features are provided by common,
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* higher level MTD layers found in drivers/mtd.
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*
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* higher level NAND MTD layers found in drivers/mtd.
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*
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* Input parameters:
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* cs - Chip select number (in the event that multiple NAND devices
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* are connected on-board).
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*
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*
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* Returned value.
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* On success a non-NULL pointer to an MTD device structure is returned;
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* NULL is returned on a failure.
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