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This commit is contained in:
adamdunkels 2007-11-10 20:45:29 +00:00
parent ca6abb286b
commit b51977a693
1 changed files with 42 additions and 38 deletions
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28
platform/sky/dev/xmem.c
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@ -26,11 +26,14 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. * SUCH DAMAGE.
* *
* @(#)$Id: xmem.c,v 1.2 2006/08/10 16:42:11 bg- Exp $ * @(#)$Id: xmem.c,v 1.3 2007/11/10 20:45:29 adamdunkels Exp $
*/ */
/* /**
* \file
* Device driver for the ST M25P80 40MHz 1Mbyte external memory. * Device driver for the ST M25P80 40MHz 1Mbyte external memory.
* \author
* Björn Grönvall <bg@sics.se>
* *
* Data is written bit inverted (~-operator) to flash so that * Data is written bit inverted (~-operator) to flash so that
* unwritten data will read as zeros (UNIX style). * unwritten data will read as zeros (UNIX style).
@ -64,13 +67,13 @@
#define SPI_FLASH_INS_BE 0xc7 #define SPI_FLASH_INS_BE 0xc7
#define SPI_FLASH_INS_DP 0xb9 #define SPI_FLASH_INS_DP 0xb9
#define SPI_FLASH_INS_RES 0xab #define SPI_FLASH_INS_RES 0xab
/*---------------------------------------------------------------------------*/
static void static void
spi_tx(unsigned byte) spi_tx(unsigned byte)
{ {
FASTSPI_TX(byte); FASTSPI_TX(byte);
} }
/*---------------------------------------------------------------------------*/
static void static void
write_enable(void) write_enable(void)
{ {
@ -84,7 +87,7 @@ write_enable(void)
SPI_FLASH_DISABLE(); SPI_FLASH_DISABLE();
splx(s); splx(s);
} }
/*---------------------------------------------------------------------------*/
static unsigned static unsigned
read_status_register(void) read_status_register(void)
{ {
@ -105,7 +108,7 @@ read_status_register(void)
return u; return u;
} }
/*---------------------------------------------------------------------------*/
/* /*
* Wait for a write/erase operation to finish. * Wait for a write/erase operation to finish.
*/ */
@ -118,7 +121,7 @@ wait_ready(void)
} while(u & 0x01); /* WIP=1, write in progress */ } while(u & 0x01); /* WIP=1, write in progress */
return u; return u;
} }
/*---------------------------------------------------------------------------*/
/* /*
* Erase 64k bytes of data. It takes about 1s before WIP goes low! * Erase 64k bytes of data. It takes about 1s before WIP goes low!
*/ */
@ -142,7 +145,7 @@ erase_sector(off_t offset)
SPI_FLASH_DISABLE(); SPI_FLASH_DISABLE();
splx(s); splx(s);
} }
/*---------------------------------------------------------------------------*/
/* /*
* Initialize external flash *and* SPI bus! * Initialize external flash *and* SPI bus!
*/ */
@ -157,7 +160,7 @@ xmem_init(void)
SPI_FLASH_DISABLE(); /* Unselect flash. */ SPI_FLASH_DISABLE(); /* Unselect flash. */
SPI_FLASH_UNHOLD(); SPI_FLASH_UNHOLD();
} }
/*---------------------------------------------------------------------------*/
int int
xmem_pread(void *_p, int size, off_t offset) xmem_pread(void *_p, int size, off_t offset)
{ {
@ -186,7 +189,7 @@ xmem_pread(void *_p, int size, off_t offset)
splx(s); splx(s);
return size; return size;
} }
/*---------------------------------------------------------------------------*/
static const char * static const char *
program_page(off_t offset, const unsigned char *p, int nbytes) program_page(off_t offset, const unsigned char *p, int nbytes)
{ {
@ -214,7 +217,7 @@ program_page(off_t offset, const unsigned char *p, int nbytes)
return p; return p;
} }
/*---------------------------------------------------------------------------*/
int int
xmem_pwrite(const void *_buf, int size, off_t addr) xmem_pwrite(const void *_buf, int size, off_t addr)
{ {
@ -231,7 +234,7 @@ xmem_pwrite(const void *_buf, int size, off_t addr)
} }
return size; return size;
} }
/*---------------------------------------------------------------------------*/
int int
xmem_erase(long size, off_t addr) xmem_erase(long size, off_t addr)
{ {
@ -252,3 +255,4 @@ xmem_erase(long size, off_t addr)
return size; return size;
} }
/*---------------------------------------------------------------------------*/