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The SST25 driver now works with SST25 (at least using the slow write mode)

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4875 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-06-27 15:35:35 +00:00
parent 2fc50198b2
commit d7f8daf475
2 changed files with 182 additions and 111 deletions
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8
configs/mirtoo/README.txt
View File

@ -872,10 +872,10 @@ Where <subdir> is one of the following:
NOTES: (1) It takes many seconds to boot the sytem using the NXFFS
file system because the entire FLASH must be verified on power up
(and many *minutes* the first time that NXFFS comes up and has to
format the file system). (2) FAT does not have these delays and this
configuration can be modified to use the (larger) FAT file system as
described below:
(and longer the first time that NXFFS comes up and has to format the
entire FLASH). (2) FAT does not have these delays and this configuration
can be modified to use the (larger) FAT file system as described below.
But you will, or course, lose the wear-leveling feature if FAT is used.
fat:
There is no FAT configuration, but the nxffx configuration can be used

285
drivers/mtd/sst25.c
View File

@ -77,6 +77,17 @@
# define CONFIG_SST25_SPIFREQUENCY 20000000
#endif
/* There is a bug in the current code when using the higher speed AAI write sequence.
* The nature of the bug is that the WRDI instruction is not working. At the end
* of the AAI sequence, the status register continues to report that the SST25 is
* write enabled (WEL bit) and in AAI mode (AAI bit). This *must* be fixed in any
* production code if you want to have proper write performance.
*/
#warning "REVISIT"
#undef CONFIG_SST25_SLOWWRITE
#define CONFIG_SST25_SLOWWRITE 1
/* SST25 Instructions ***************************************************************/
/* Command Value Description Addr Data */
/* Dummy */
@ -150,7 +161,7 @@
# define SST25_SECTOR_SIZE 512 /* Sector size = 512 bytes */
#endif
#define SST25_ERASE_STATE 0xff /* State of FLASH when erased */
#define SST25_ERASED_STATE 0xff /* State of FLASH when erased */
/* Cache flags */
@ -205,7 +216,7 @@ static inline int sst25_readid(FAR struct sst25_dev_s *priv);
#ifndef CONFIG_SST25_READONLY
static void sst25_unprotect(FAR struct spi_dev_s *dev);
#endif
static void sst25_waitwritecomplete(FAR struct sst25_dev_s *priv);
static uint8_t sst25_waitwritecomplete(FAR struct sst25_dev_s *priv);
static inline void sst25_wren(FAR struct sst25_dev_s *priv);
static inline void sst25_wrdi(FAR struct sst25_dev_s *priv);
static void sst25_sectorerase(FAR struct sst25_dev_s *priv, off_t offset);
@ -214,17 +225,17 @@ static void sst25_byteread(FAR struct sst25_dev_s *priv, FAR uint8_t *buffer,
off_t address, size_t nbytes);
#ifndef CONFIG_SST25_READONLY
#ifdef CONFIG_SST25_SLOWWRITE
static void sst32_bytewrite(FAR struct sst25_dev_s *priv, FAR const uint8_t *buffer,
static void sst25_bytewrite(FAR struct sst25_dev_s *priv, FAR const uint8_t *buffer,
off_t address, size_t nbytes);
#else
static void sst32_wordwrite(FAR struct sst25_dev_s *priv, FAR const uint8_t *buffer,
static void sst25_wordwrite(FAR struct sst25_dev_s *priv, FAR const uint8_t *buffer,
off_t address, size_t nbytes);
#endif
#ifdef CONFIG_SST25_SECTOR512
static void sst25_cacheflush(struct sst25_dev_s *priv);
static FAR uint8_t *sst25_cacheread(struct sst25_dev_s *priv, off_t sector);
static void sst25_cacheerase(struct sst25_dev_s *priv, off_t sector);
static void sst32_cachewrite(FAR struct sst25_dev_s *priv, FAR const uint8_t *buffer,
static void sst25_cachewrite(FAR struct sst25_dev_s *priv, FAR const uint8_t *buffer,
off_t sector, size_t nsectors);
#endif
#endif
@ -373,7 +384,7 @@ static void sst25_unprotect(FAR struct spi_dev_s *dev)
* Name: sst25_waitwritecomplete
************************************************************************************/
static void sst25_waitwritecomplete(struct sst25_dev_s *priv)
static uint8_t sst25_waitwritecomplete(struct sst25_dev_s *priv)
{
uint8_t status;
@ -430,15 +441,19 @@ static void sst25_waitwritecomplete(struct sst25_dev_s *priv)
* other peripherals to access the SPI bus.
*/
#if 0 /* Makes writes too slow */
if ((status & SST25_SR_BUSY) != 0)
{
sst25_unlock(priv->dev);
usleep(1000);
sst25_lock(priv->dev);
}
#endif
}
while ((status & SST25_SR_BUSY) != 0);
#endif
return status;
}
/************************************************************************************
@ -477,7 +492,6 @@ static inline void sst25_wrdi(struct sst25_dev_s *priv)
/* Deselect the FLASH */
SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
fvdbg("Enabled\n");
}
/************************************************************************************
@ -492,7 +506,7 @@ static void sst25_sectorerase(struct sst25_dev_s *priv, off_t sector)
/* Wait for any preceding write or erase operation to complete. */
sst25_waitwritecomplete(priv);
(void)sst25_waitwritecomplete(priv);
/* Send write enable instruction */
@ -529,7 +543,7 @@ static inline int sst25_chiperase(struct sst25_dev_s *priv)
/* Wait for any preceding write or erase operation to complete. */
sst25_waitwritecomplete(priv);
(void)sst25_waitwritecomplete(priv);
/* Send write enable instruction */
@ -557,11 +571,14 @@ static inline int sst25_chiperase(struct sst25_dev_s *priv)
static void sst25_byteread(FAR struct sst25_dev_s *priv, FAR uint8_t *buffer,
off_t address, size_t nbytes)
{
uint8_t status;
fvdbg("address: %08lx nbytes: %d\n", (long)address, (int)nbytes);
/* Wait for any preceding write or erase operation to complete. */
sst25_waitwritecomplete(priv);
status = sst25_waitwritecomplete(priv);
DEBUGASSERT((status & (SST25_SR_WEL|SST25_SR_BP_MASK|SST25_SR_AAI)) == 0);
/* Select this FLASH part */
@ -597,13 +614,15 @@ static void sst25_byteread(FAR struct sst25_dev_s *priv, FAR uint8_t *buffer,
}
/************************************************************************************
* Name: sst32_bytewrite
* Name: sst25_bytewrite
************************************************************************************/
#if defined(CONFIG_SST25_SLOWWRITE) && !defined(CONFIG_SST25_READONLY)
static void sst32_bytewrite(struct sst25_dev_s *priv, FAR const uint8_t *buffer,
static void sst25_bytewrite(struct sst25_dev_s *priv, FAR const uint8_t *buffer,
off_t address, size_t nbytes)
{
uint8_t status;
fvdbg("address: %08lx nwords: %d\n", (long)address, (int)nbytes);
DEBUGASSERT(priv && buffer);
@ -611,9 +630,94 @@ static void sst32_bytewrite(struct sst25_dev_s *priv, FAR const uint8_t *buffer,
for (; nbytes > 0; nbytes--)
{
/* Skip over bytes that are begin written to the erased state */
if (*buffer != SST25_ERASED_STATE)
{
/* Wait for any preceding write or erase operation to complete. */
status = sst25_waitwritecomplete(priv);
DEBUGASSERT((status & (SST25_SR_WEL|SST25_SR_BP_MASK|SST25_SR_AAI)) == 0);
/* Enable write access to the FLASH */
sst25_wren(priv);
/* Select this FLASH part */
SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
/* Send "Byte Program (BP)" command */
(void)SPI_SEND(priv->dev, SST25_BP);
/* Send the byte address high byte first. */
(void)SPI_SEND(priv->dev, (address >> 16) & 0xff);
(void)SPI_SEND(priv->dev, (address >> 8) & 0xff);
(void)SPI_SEND(priv->dev, address & 0xff);
/* Then write the single byte */
(void)SPI_SEND(priv->dev, *buffer);
/* Deselect the FLASH and setup for the next pass through the loop */
SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
}
/* Advance to the next byte */
buffer++;
address++;
}
}
#endif
/************************************************************************************
* Name: sst25_wordwrite
************************************************************************************/
#if !defined(CONFIG_SST25_SLOWWRITE) && !defined(CONFIG_SST25_READONLY)
static void sst25_wordwrite(struct sst25_dev_s *priv, FAR const uint8_t *buffer,
off_t address, size_t nbytes)
{
size_t nwords = (nbytes + 1) >> 1;
uint8_t status;
fvdbg("address: %08lx nwords: %d\n", (long)address, (int)nwords);
DEBUGASSERT(priv && buffer);
/* Loop until all of the bytes have been written */
while (nwords > 0)
{
/* Skip over any data that is being written to the erased state */
while (nwords > 0 &&
buffer[0] == SST25_ERASED_STATE &&
buffer[1] == SST25_ERASED_STATE)
{
/* Decrement the word count and advance the write position */
nwords--;
buffer += 2;
address += 2;
}
/* If there are no further non-erased bytes in the user buffer, then
* we are finished.
*/
if (nwords <= 0)
{
return;
}
/* Wait for any preceding write or erase operation to complete. */
sst25_waitwritecomplete(priv);
status = sst25_waitwritecomplete(priv);
DEBUGASSERT((status & (SST25_SR_WEL|SST25_SR_BP_MASK|SST25_SR_AAI)) == 0);
/* Enable write access to the FLASH */
@ -623,104 +727,71 @@ static void sst32_bytewrite(struct sst25_dev_s *priv, FAR const uint8_t *buffer,
SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
/* Send "Byte Program (BP)" command */
/* Send "Auto Address Increment (AAI)" command */
(void)SPI_SEND(priv->dev, SST25_BP);
(void)SPI_SEND(priv->dev, SST25_AAI);
/* Send the byte address high byte first. */
/* Send the word address high byte first. */
(void)SPI_SEND(priv->dev, (address >> 16) & 0xff);
(void)SPI_SEND(priv->dev, (address >> 8) & 0xff);
(void)SPI_SEND(priv->dev, address & 0xff);
/* Then write the single byte */
(void)SPI_SEND(priv->dev, *buffer);
/* Deselect the FLASH and setup for the next pass through the loop */
SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
buffer++;
address++;
}
}
#endif
/************************************************************************************
* Name: sst32_wordwrite
************************************************************************************/
#if !defined(CONFIG_SST25_SLOWWRITE) && !defined(CONFIG_SST25_READONLY)
static void sst32_wordwrite(struct sst25_dev_s *priv, FAR const uint8_t *buffer,
off_t address, size_t nbytes)
{
size_t nwords = (nbytes + 1) >> 1;
fvdbg("address: %08lx nwords: %d\n", (long)address, (int)nwords);
DEBUGASSERT(priv && buffer);
/* Wait for any preceding write or erase operation to complete. */
sst25_waitwritecomplete(priv);
/* Enable write access to the FLASH */
sst25_wren(priv);
/* Select this FLASH part */
SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
/* Send "Auto Address Increment (AAI)" command */
(void)SPI_SEND(priv->dev, SST25_AAI);
/* Send the word address high byte first. */
(void)SPI_SEND(priv->dev, (address >> 16) & 0xff);
(void)SPI_SEND(priv->dev, (address >> 8) & 0xff);
(void)SPI_SEND(priv->dev, address & 0xff);
/* Then write one 16-bit word */
SPI_SNDBLOCK(priv->dev, buffer, 2);
/* Deselect the FLASH: Chip Select high */
SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
buffer += 2;
/* Now loop, writing 16-bits of data on each pass through the loop until all
* of the words have been transferred.
*/
for (nwords--; nwords > 0; nwords--)
{
/* Wait for the preceding write to complete. */
sst25_waitwritecomplete(priv);
/* Select this FLASH part */
SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
/* Send "Auto Address Increment (AAI)" command with no address */
(void)SPI_SEND(priv->dev, SST25_AAI);
/* Then write one 16-bit word */
SPI_SNDBLOCK(priv->dev, buffer, 2);
buffer += 2;
/* Deselect the FLASH: Chip Select high */
SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
/* Decrement the word count and advance the write position */
nwords--;
buffer += 2;
address += 2;
/* Now loop, writing 16-bits of data on each pass through the loop
* until all of the words have been transferred or until we encounter
* data to be written to the erased state.
*/
while (nwords > 0 &&
(buffer[0] != SST25_ERASED_STATE ||
buffer[1] != SST25_ERASED_STATE))
{
/* Wait for the preceding write to complete. */
status = sst25_waitwritecomplete(priv);
DEBUGASSERT((status & (SST25_SR_WEL|SST25_SR_BP_MASK|SST25_SR_AAI)) == (SST25_SR_WEL|SST25_SR_AAI));
/* Select this FLASH part */
SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
/* Send "Auto Address Increment (AAI)" command with no address */
(void)SPI_SEND(priv->dev, SST25_AAI);
/* Then write one 16-bit word */
SPI_SNDBLOCK(priv->dev, buffer, 2);
/* Deselect the FLASH: Chip Select high */
SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
/* Decrement the word count and advance the write position */
nwords--;
buffer += 2;
address += 2;
}
/* Disable writing */
sst25_wrdi(priv);
}
/* Disable writing */
sst25_wrdi(priv);
}
#endif
@ -741,10 +812,10 @@ static void sst25_cacheflush(struct sst25_dev_s *priv)
/* Write entire erase block to FLASH */
#ifdef CONFIG_SST25_SLOWWRITE
sst32_bytewrite(priv, priv->sector, (off_t)priv->esectno << priv->sectorshift,
sst25_bytewrite(priv, priv->sector, (off_t)priv->esectno << priv->sectorshift,
(1 << priv->sectorshift));
#else
sst32_wordwrite(priv, priv->sector, (off_t)priv->esectno << priv->sectorshift,
sst25_wordwrite(priv, priv->sector, (off_t)priv->esectno << priv->sectorshift,
(1 << priv->sectorshift));
#endif
@ -841,7 +912,7 @@ static void sst25_cacheerase(struct sst25_dev_s *priv, off_t sector)
* time).
*/
memset(dest, SST25_ERASE_STATE, SST25_SECTOR_SIZE);
memset(dest, SST25_ERASED_STATE, SST25_SECTOR_SIZE);
SET_DIRTY(priv);
}
#endif
@ -851,7 +922,7 @@ static void sst25_cacheerase(struct sst25_dev_s *priv, off_t sector)
************************************************************************************/
#if defined(CONFIG_SST25_SECTOR512) && !defined(CONFIG_SST25_READONLY)
static void sst32_cachewrite(FAR struct sst25_dev_s *priv, FAR const uint8_t *buffer,
static void sst25_cachewrite(FAR struct sst25_dev_s *priv, FAR const uint8_t *buffer,
off_t sector, size_t nsectors)
{
FAR uint8_t *dest;
@ -941,7 +1012,7 @@ static int sst25_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nbloc
************************************************************************************/
static ssize_t sst25_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
FAR uint8_t *buffer)
FAR uint8_t *buffer)
{
#ifdef CONFIG_SST25_SECTOR512
ssize_t nbytes;
@ -980,7 +1051,7 @@ static ssize_t sst25_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t n
************************************************************************************/
static ssize_t sst25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
FAR const uint8_t *buffer)
FAR const uint8_t *buffer)
{
#ifdef CONFIG_SST25_READONLY
return -EACCESS;
@ -994,12 +1065,12 @@ static ssize_t sst25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t
sst25_lock(priv->dev);
#if defined(CONFIG_SST25_SECTOR512)
sst32_cachewrite(priv, buffer, startblock, nblocks);
sst25_cachewrite(priv, buffer, startblock, nblocks);
#elif defined(CONFIG_SST25_SLOWWRITE)
sst32_bytewrite(priv, buffer, startblock << priv->sectorshift,
sst25_bytewrite(priv, buffer, startblock << priv->sectorshift,
nblocks << priv->sectorshift);
#else
sst32_wordwrite(priv, buffer, startblock << priv->sectorshift,
sst25_wordwrite(priv, buffer, startblock << priv->sectorshift,
nblocks << priv->sectorshift);
#endif
sst25_unlock(priv->dev);
@ -1013,7 +1084,7 @@ static ssize_t sst25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t
************************************************************************************/
static ssize_t sst25_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes,
FAR uint8_t *buffer)
FAR uint8_t *buffer)
{
FAR struct sst25_dev_s *priv = (FAR struct sst25_dev_s *)dev;