giomba/nes-proj
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

* Avoid using FASTSPI_TX to reduce size of object code.

Browse Source 
* Use off_t to avoid overflows.
This commit is contained in:
bg- 2006-08-10 16:42:11 +00:00
parent 5dacf0be11
commit 7f7a6ae577
1 changed files with 43 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
platform/sky/dev/xmem.c
View File

@ -26,7 +26,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)$Id: xmem.c,v 1.1 2006/08/02 14:44:46 bg- Exp $
* @(#)$Id: xmem.c,v 1.2 2006/08/10 16:42:11 bg- Exp $
*/
/*
@ -47,6 +47,12 @@
#include "dev/spi.h"
#include "dev/xmem.h"
#if 0
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...) do {} while (0)
#endif
#define SPI_FLASH_INS_WREN 0x06
#define SPI_FLASH_INS_WRDI 0x04
#define SPI_FLASH_INS_RDSR 0x05
@ -59,6 +65,12 @@
#define SPI_FLASH_INS_DP 0xb9
#define SPI_FLASH_INS_RES 0xab
static void
spi_tx(unsigned byte)
{
FASTSPI_TX(byte);
}
static void
write_enable(void)
{
@ -67,7 +79,7 @@ write_enable(void)
s = splhigh();
SPI_FLASH_ENABLE();
FASTSPI_TX(SPI_FLASH_INS_WREN);
spi_tx(SPI_FLASH_INS_WREN);
SPI_FLASH_DISABLE();
splx(s);
@ -83,7 +95,7 @@ read_status_register(void)
s = splhigh();
SPI_FLASH_ENABLE();
FASTSPI_TX(SPI_FLASH_INS_RDSR);
spi_tx(SPI_FLASH_INS_RDSR);
FASTSPI_CLEAR_RX();
FASTSPI_RX(u);
@ -95,10 +107,10 @@ read_status_register(void)
}
/*
* Wait for a write operation to finish.
* Wait for a write/erase operation to finish.
*/
static unsigned
eeprom_finish(void)
wait_ready(void)
{
unsigned u;
do {
@ -108,24 +120,24 @@ eeprom_finish(void)
}
/*
* Erase 64kBytes of date, it takes about 1s before WIP goes low!
* Erase 64k bytes of data. It takes about 1s before WIP goes low!
*/
static void
sector_erase(unsigned long offset)
erase_sector(off_t offset)
{
int s;
eeprom_finish();
wait_ready();
write_enable();
s = splhigh();
SPI_FLASH_ENABLE();
FASTSPI_TX(SPI_FLASH_INS_SE);
FASTSPI_TX(offset >> 16); /* MSB */
FASTSPI_TX(offset >> 8);
FASTSPI_TX(offset >> 0); /* LSB */
spi_tx(SPI_FLASH_INS_SE);
spi_tx(offset >> 16); /* MSB */
spi_tx(offset >> 8);
spi_tx(offset >> 0); /* LSB */
SPI_FLASH_DISABLE();
splx(s);
@ -153,15 +165,15 @@ xmem_pread(void *_p, int size, off_t offset)
const unsigned char *end = p + size;
int s;
eeprom_finish();
wait_ready();
s = splhigh();
SPI_FLASH_ENABLE();
FASTSPI_TX(SPI_FLASH_INS_READ);
FASTSPI_TX(offset >> 16); /* MSB */
FASTSPI_TX(offset >> 8);
FASTSPI_TX(offset >> 0); /* LSB */
spi_tx(SPI_FLASH_INS_READ);
spi_tx(offset >> 16); /* MSB */
spi_tx(offset >> 8);
spi_tx(offset >> 0); /* LSB */
FASTSPI_CLEAR_RX();
for(; p < end; p++) {
@ -176,25 +188,25 @@ xmem_pread(void *_p, int size, off_t offset)
}
static const char *
eeprom_page_program(unsigned long offset, const unsigned char *p, int nbytes)
program_page(off_t offset, const unsigned char *p, int nbytes)
{
const unsigned char *end = p + nbytes;
int s;
eeprom_finish();
wait_ready();
write_enable();
s = splhigh();
SPI_FLASH_ENABLE();
FASTSPI_TX(SPI_FLASH_INS_PP);
FASTSPI_TX(offset >> 16); /* MSB */
FASTSPI_TX(offset >> 8);
FASTSPI_TX(offset >> 0); /* LSB */
spi_tx(SPI_FLASH_INS_PP);
spi_tx(offset >> 16); /* MSB */
spi_tx(offset >> 8);
spi_tx(offset >> 0); /* LSB */
for(; p < end; p++) {
FASTSPI_TX(~*p);
spi_tx(~*p);
}
SPI_FLASH_DISABLE();
@ -206,16 +218,15 @@ eeprom_page_program(unsigned long offset, const unsigned char *p, int nbytes)
int
xmem_pwrite(const void *_buf, int size, off_t addr)
{
const unsigned char *buf = _buf;
unsigned i, next_page, end;
const char *p = buf;
const unsigned char *p = _buf;
const off_t end = addr + size;
off_t i, next_page;
end = addr + size;
for(i = addr; i < end;) {
next_page = (i | 0xff) + 1;
if(next_page > end)
next_page = end;
p = eeprom_page_program(i, p, next_page - i);
p = program_page(i, p, next_page - i);
i = next_page;
}
return size;
@ -227,17 +238,17 @@ xmem_erase(long size, off_t addr)
off_t end = addr + size;
if(size % XMEM_ERASE_UNIT_SIZE != 0) {
printf("xmem_erase: bad size\n");
PRINTF("xmem_erase: bad size\n");
return -1;
}
if(addr % XMEM_ERASE_UNIT_SIZE != 0) {
printf("xmem_erase: bad offset\n");
PRINTF("xmem_erase: bad offset\n");
return -1;
}
for (; addr < end; addr += XMEM_ERASE_UNIT_SIZE)
sector_erase(addr);
erase_sector(addr);
return size;
}