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

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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 * Pre-processor Definitions
************************************************************************************/ ************************************************************************************/
/* Configuration ********************************************************************/ /* Configuration ********************************************************************/
#ifndef CONFIG_AT25_SPIMODE #ifndef CONFIG_AT25_SPIMODE
@ -69,11 +70,23 @@
#endif #endif
/* AT25 Registers *******************************************************************/ /* 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 */ #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: /* AT25DF321 capacity is 4,194,304 bytes:
* (64 sectors) * (65,536 bytes per sector) * (64 sectors) * (65,536 bytes per sector)
* (16384 pages) * (256 bytes per page) * (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); FAR uint8_t *buffer);
static int at25_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg); static int at25_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg);
/************************************************************************************
* Private Data
************************************************************************************/
/************************************************************************************ /************************************************************************************
* Private Functions * Private Functions
************************************************************************************/ ************************************************************************************/
@ -237,13 +246,21 @@ static inline int at25_readid(struct at25_dev_s *priv)
/* Check for a valid manufacturer and memory type */ /* 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->sectorshift = AT25_AT25DF081A_SECTOR_SHIFT;
priv->nsectors = AT25_AT25DF321_NSECTORS; priv->nsectors = AT25_AT25DF081A_NSECTORS;
priv->pageshift = AT25_AT25DF321_PAGE_SHIFT; priv->pageshift = AT25_AT25DF081A_PAGE_SHIFT;
priv->npages = AT25_AT25DF321_NPAGES; priv->npages = AT25_AT25DF081A_NPAGES;
return OK; 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; 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 */ /* 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) if (nbytes > 0)
{ {
return nbytes >> priv->pageshift; 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 * Name: at25_bwrite
************************************************************************************/ ************************************************************************************/
static ssize_t at25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, static ssize_t at25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
FAR const uint8_t *buffer) size_t nblocks, FAR const uint8_t *buffer)
{ {
FAR struct at25_dev_s *priv = (FAR struct at25_dev_s *)dev; FAR struct at25_dev_s *priv = (FAR struct at25_dev_s *)dev;
size_t blocksleft = nblocks; 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: case MTDIOC_GEOMETRY:
{ {
FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)((uintptr_t)arg); FAR struct mtd_geometry_s *geo =
if (geo) FAR struct mtd_geometry_s *)((uintptr_t)arg);
if (geo != NULL)
{ {
/* Populate the geometry structure with information need to know /* Populate the geometry structure with information need to know
* the capacity and how to access the device. * the capacity and how to access the device.