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Blackfin: add support for SST SPI flashes 

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2008-10-11 22:51:05 -04:00
parent 5b8cfbe63f
commit efcc08cede
1 changed files with 78 additions and 29 deletions
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107
board/bf537-stamp/spi_flash.c
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@ -59,6 +59,15 @@ static struct flash_info flash_st_serial_flash[] = {
{ NULL, 0, 0, 0 }
};
/* SPI Speeds: 20 MHz / 40 MHz */
static struct flash_info flash_sst_serial_flash[] = {
{ "SST25WF512", 0x2501, 4 * 1024, 128 },
{ "SST25WF010", 0x2502, 4 * 1024, 256 },
{ "SST25WF020", 0x2503, 4 * 1024, 512 },
{ "SST25WF040", 0x2504, 4 * 1024, 1024 },
{ NULL, 0, 0, 0 }
};
/* SPI Speeds: 66 MHz / 33 MHz */
static struct flash_info flash_atmel_dataflash[] = {
{ "AT45DB011x", 0x0c, 264, 512 },
@ -98,6 +107,13 @@ static struct flash_ops flash_st_ops = {
.status = 0x05,
};
static struct flash_ops flash_sst_ops = {
.read = OP_READ,
.write = 0x02,
.erase = 0x20,
.status = 0x05,
};
static struct flash_ops flash_atmel_ops = {
.read = OP_READ,
.write = 0x82,
@ -131,6 +147,7 @@ static struct {
enum {
JED_MANU_SPANSION = 0x01,
JED_MANU_ST = 0x20,
JED_MANU_SST = 0xBF,
JED_MANU_ATMEL = 0x1F,
JED_MANU_WINBOND = 0xEF,
};
@ -148,6 +165,12 @@ static struct manufacturer_info flash_manufacturers[] = {
.flashes = flash_st_serial_flash,
.ops = &flash_st_ops,
},
{
.name = "SST",
.id = JED_MANU_SST,
.flashes = flash_sst_serial_flash,
.ops = &flash_sst_ops,
},
{
.name = "Atmel",
.id = JED_MANU_ATMEL,
@ -276,6 +299,7 @@ static int wait_for_ready_status(void)
switch (flash.manufacturer_id) {
case JED_MANU_SPANSION:
case JED_MANU_ST:
case JED_MANU_SST:
case JED_MANU_WINBOND:
if (!(read_status_register() & 0x01))
return 0;
@ -297,6 +321,50 @@ static int wait_for_ready_status(void)
return -1;
}
static int enable_writing(void)
{
ulong start;
if (flash.manufacturer_id == JED_MANU_ATMEL)
return 0;
/* A write enable instruction must previously have been executed */
SPI_ON();
spi_write_read_byte(0x06);
SPI_OFF();
/* The status register will be polled to check the write enable latch "WREN" */
start = get_timer(0);
while (get_timer(0) - start < TIMEOUT) {
if (read_status_register() & 0x02)
return 0;
if (ctrlc()) {
puts("\nAbort\n");
return -1;
}
}
puts("Timeout\n");
return -1;
}
static void write_status_register(uint8_t val)
{
if (flash.manufacturer_id != JED_MANU_SST)
hang();
if (enable_writing())
return;
/* send instruction to write status register */
SPI_ON();
spi_write_read_byte(0x01);
/* and clear it! */
spi_write_read_byte(val);
SPI_OFF();
}
/* Request and read the manufacturer and device id of parts which
* are compatible with the JEDEC standard (JEP106) and use that to
* setup other operating conditions.
@ -351,6 +419,7 @@ static int spi_detect_part(void)
switch (flash.manufacturer_id) {
case JED_MANU_SPANSION:
case JED_MANU_ST:
case JED_MANU_SST:
case JED_MANU_WINBOND:
for (i = 0; flash.manufacturer->flashes[i].name; ++i) {
if (dev_id == flash.manufacturer->flashes[i].id)
@ -362,7 +431,11 @@ static int spi_detect_part(void)
flash.flash = &flash.manufacturer->flashes[i];
flash.sector_size = flash.flash->sector_size;
flash.num_sectors = flash.flash->num_sectors;
flash.write_length = 256;
if (flash.manufacturer_id == JED_MANU_SST)
flash.write_length = 1; /* pwnt :( */
else
flash.write_length = 256;
break;
case JED_MANU_ATMEL: {
@ -388,6 +461,10 @@ static int spi_detect_part(void)
}
}
/* the SST parts power up with software protection enabled by default */
if (flash.manufacturer_id == JED_MANU_SST)
write_status_register(0);
called_init = 1;
return 0;
@ -572,34 +649,6 @@ static int read_flash(unsigned long address, long count, uchar *buffer)
return 0;
}
static int enable_writing(void)
{
ulong start;
if (flash.manufacturer_id == JED_MANU_ATMEL)
return 0;
/* A write enable instruction must previously have been executed */
SPI_ON();
spi_write_read_byte(0x06);
SPI_OFF();
/* The status register will be polled to check the write enable latch "WREN" */
start = get_timer(0);
while (get_timer(0) - start < TIMEOUT) {
if (read_status_register() & 0x02)
return 0;
if (ctrlc()) {
puts("\nAbort\n");
return -1;
}
}
puts("Timeout\n");
return -1;
}
static long address_to_sector(unsigned long address)
{
if (address > (flash.num_sectors * flash.sector_size) - 1)