int probe_jedec (struct flashchip * flash)
{
volatile char * bios = flash->virt_addr;
unsigned char id1, id2;
*(volatile char *) (bios + 0x5555) = 0xAA;
*(volatile char *) (bios + 0x2AAA) = 0x55;
*(volatile char *) (bios + 0x5555) = 0x90;
myusec_delay(10);
id1 = *(volatile unsigned char *) bios;
id2 = *(volatile unsigned char *) (bios + 0x01);
*(volatile char *) (bios + 0x5555) = 0xAA;
*(volatile char *) (bios + 0x2AAA) = 0x55;
*(volatile char *) (bios + 0x5555) = 0xF0;
myusec_delay(10);
printf("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
if (id1 == flash->manufacture_id && id2 == flash->model_id)
return 1;
return 0;
}
uint8_t wait_lhf00l04(volatile uint8_t *bios)
{
uint8_t status;
uint8_t id1, id2;
*bios = 0x70;
if ((*bios & 0x80) == 0) { // it's busy
while ((*bios & 0x80) == 0) ;
}
status = *bios;
// put another command to get out of status register mode
*bios = 0x90;
myusec_delay(10);
id1 = *(volatile uint8_t *)bios;
id2 = *(volatile uint8_t *)(bios + 0x01);
// this is needed to jam it out of "read id" mode
*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
return status;
}
int erase_lhf00l04_block(struct flashchip *flash, int offset)
{
volatile uint8_t *bios = flash->virtual_memory + offset;
volatile uint8_t *wrprotect = flash->virtual_registers + offset + 2;
uint8_t status;
// clear status register
*bios = 0x50;
printf("Erase at %p\n", bios);
status = wait_lhf00l04(flash->virtual_memory);
print_lhf00l04_status(status);
// clear write protect
printf("write protect is at %p\n", (wrprotect));
printf("write protect is 0x%x\n", *(wrprotect));
*(wrprotect) = 0;
printf("write protect is 0x%x\n", *(wrprotect));
// now start it
*(volatile uint8_t *)(bios) = 0x20;
*(volatile uint8_t *)(bios) = 0xd0;
myusec_delay(10);
// now let's see what the register is
status = wait_lhf00l04(flash->virtual_memory);
print_lhf00l04_status(status);
printf("DONE BLOCK 0x%x\n", offset);
return (0);
}
int probe_lhf00l04(struct flashchip *flash)
{
volatile uint8_t *bios = flash->virtual_memory;
uint8_t id1, id2;
#if 0
/* Enter ID mode */
*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
*(volatile uint8_t *)(bios + 0x5555) = 0x90;
#endif
*bios = 0xff;
myusec_delay(10);
*bios = 0x90;
myusec_delay(10);
id1 = *(volatile uint8_t *)bios;
id2 = *(volatile uint8_t *)(bios + 0x01);
/* Leave ID mode */
*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
myusec_delay(10);
printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
if (id1 != flash->manufacture_id || id2 != flash->model_id)
return 0;
map_flash_registers(flash);
return 1;
}
int erase_jedec (struct flashchip * flash)
{
volatile char * bios = flash->virt_addr;
*(volatile char *) (bios + 0x5555) = 0xAA;
*(volatile char *) (bios + 0x2AAA) = 0x55;
*(volatile char *) (bios + 0x5555) = 0x80;
*(volatile char *) (bios + 0x5555) = 0xAA;
*(volatile char *) (bios + 0x2AAA) = 0x55;
*(volatile char *) (bios + 0x5555) = 0x10;
myusec_delay(10);
toggle_ready_jedec(bios);
return(0);
}
