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drivers/mtd/at25.c: Added support for AT25DF081A serial flash chip

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This commit is contained in:
Marc Rosen 2018-12-12 06:46:22 -06:00 committed by Gregory Nutt
parent 400215669a
commit 16dff59cbd
1 changed files with 37 additions and 17 deletions
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54
drivers/mtd/at25.c
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@ -58,6 +58,7 @@
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/* Configuration ********************************************************************/
#ifndef CONFIG_AT25_SPIMODE
@ -69,11 +70,23 @@
#endif
/* AT25 Registers *******************************************************************/
/* Indentification register values */
#define AT25_MANUFACTURER 0x1F
/* Identification register values */
#define AT25_MANUFACTURER 0x1f
#define AT25_AT25DF081A_TYPE 0x45 /* 8 M-bit */
#define AT25_AT25DF321_TYPE 0x47 /* 32 M-bit */
/* AT25DF081A capacity is 1,048,575 bytes:
* (16 sectors) * (65,536 bytes per sector)
* (4096 pages) * (256 bytes per page)
*/
#define AT25_AT25DF081A_SECTOR_SHIFT 12 /* Sector size 1 << 12 = 4096 */
#define AT25_AT25DF081A_NSECTORS 256
#define AT25_AT25DF081A_PAGE_SHIFT 9 /* Page size 1 << 8 = 256 */
#define AT25_AT25DF081A_NPAGES 2048
/* AT25DF321 capacity is 4,194,304 bytes:
* (64 sectors) * (65,536 bytes per sector)
* (16384 pages) * (256 bytes per page)
@ -160,10 +173,6 @@ static ssize_t at25_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes,
FAR uint8_t *buffer);
static int at25_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg);
/************************************************************************************
* Private Data
************************************************************************************/
/************************************************************************************
* Private Functions
************************************************************************************/
@ -237,13 +246,21 @@ static inline int at25_readid(struct at25_dev_s *priv)
/* Check for a valid manufacturer and memory type */
if (manufacturer == AT25_MANUFACTURER && memory == AT25_AT25DF321_TYPE)
if (manufacturer == AT25_MANUFACTURER && memory == AT25_AT25DF081A_TYPE)
{
priv->sectorshift = AT25_AT25DF321_SECTOR_SHIFT;
priv->nsectors = AT25_AT25DF321_NSECTORS;
priv->pageshift = AT25_AT25DF321_PAGE_SHIFT;
priv->npages = AT25_AT25DF321_NPAGES;
return OK;
priv->sectorshift = AT25_AT25DF081A_SECTOR_SHIFT;
priv->nsectors = AT25_AT25DF081A_NSECTORS;
priv->pageshift = AT25_AT25DF081A_PAGE_SHIFT;
priv->npages = AT25_AT25DF081A_NPAGES;
return OK;
}
else if (manufacturer == AT25_MANUFACTURER && memory == AT25_AT25DF321_TYPE)
{
priv->sectorshift = AT25_AT25DF321_SECTOR_SHIFT;
priv->nsectors = AT25_AT25DF321_NSECTORS;
priv->pageshift = AT25_AT25DF321_PAGE_SHIFT;
priv->npages = AT25_AT25DF321_NPAGES;
return OK;
}
return -ENODEV;
@ -478,7 +495,8 @@ static ssize_t at25_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nb
/* On this device, we can handle the block read just like the byte-oriented read */
nbytes = at25_read(dev, startblock << priv->pageshift, nblocks << priv->pageshift, buffer);
nbytes = at25_read(dev, startblock << priv->pageshift,
nblocks << priv->pageshift, buffer);
if (nbytes > 0)
{
return nbytes >> priv->pageshift;
@ -491,8 +509,8 @@ static ssize_t at25_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nb
* Name: at25_bwrite
************************************************************************************/
static ssize_t at25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
FAR const uint8_t *buffer)
static ssize_t at25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
size_t nblocks, FAR const uint8_t *buffer)
{
FAR struct at25_dev_s *priv = (FAR struct at25_dev_s *)dev;
size_t blocksleft = nblocks;
@ -581,8 +599,10 @@ static int at25_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
{
case MTDIOC_GEOMETRY:
{
FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)((uintptr_t)arg);
if (geo)
FAR struct mtd_geometry_s *geo =
FAR struct mtd_geometry_s *)((uintptr_t)arg);
if (geo != NULL)
{
/* Populate the geometry structure with information need to know
* the capacity and how to access the device.