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Rearchitecting of some MTD, partition, SMART interfaces, and FLASH drivers to: Better use the byte write capbility when available and to use smaller erase sectors for the erase sector size when available).

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This commit is contained in:
Gregory Nutt
2013-05-03 12:52:33 -06:00
parent b934926bd2
commit 72179b7773
17 changed files with 643 additions and 452 deletions
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drivers/mtd/rammtd.c
+35 -20
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@@ -228,7 +228,7 @@ static int ram_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks
* Name: ram_readbytes
****************************************************************************/
#ifdef CONFIG_RAMMTD_SMART
#ifdef CONFIG_MTD_SMART
static ssize_t ram_read_bytes(FAR struct mtd_dev_s *dev, off_t offset,
size_t nbytes, FAR uint8_t *buf)
{
@@ -328,6 +328,34 @@ static ssize_t ram_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
return nblocks;
}
/****************************************************************************
* Name: ram_bytewrite
****************************************************************************/
#ifdef CONFIG_MTD_BYTE_WRITE
static ssize_t ram_bytewrite(FAR struct mtd_dev_s *dev, off_t offset,
size_t nbytes, FAR const uint8_t *buf)
{
FAR struct ram_dev_s *priv = (FAR struct ram_dev_s *)dev;
off_t maxaddr;
DEBUGASSERT(dev && buf);
/* Don't let the write exceed the size of the ram buffer */
maxaddr = priv->nblocks * CONFIG_RAMMTD_ERASESIZE;
if (offset + nbytes > maxaddr)
{
return 0;
}
/* Then write the data to RAM */
ram_write(&priv->start[offset], buf, nbytes);
return nbytes;
}
#endif
/****************************************************************************
* Name: ram_ioctl
****************************************************************************/
@@ -380,24 +408,6 @@ static int ram_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
}
break;
#ifdef CONFIG_RAMMTD_SMART
case MTDIOC_GETCAPS:
{
ret = MTDIOC_CAPS_BYTEWRITE;
break;
}
case MTDIOC_BYTEWRITE:
{
struct mtd_byte_write_s *bytewrite = (struct mtd_byte_write_s *) arg;
ram_write(&priv->start[bytewrite->offset], bytewrite->buffer,
bytewrite->count);
ret = OK;
break;
}
#endif
default:
ret = -ENOTTY; /* Bad command */
break;
@@ -454,9 +464,14 @@ FAR struct mtd_dev_s *rammtd_initialize(FAR uint8_t *start, size_t size)
priv->mtd.bwrite = ram_bwrite;
priv->mtd.ioctl = ram_ioctl;
priv->mtd.erase = ram_erase;
#ifdef CONFIG_MTD_BYTE_WRITE
priv->mtd.write = ram_bytewrite;
#endif
#ifdef CONFIG_RAMMTD_SMART
#ifdef CONFIG_MTD_SMART
priv->mtd.read = ram_read_bytes;
#else
priv->mtd.read = NULL;
#endif
priv->start = start;