static int em357_mass_erase(struct flash_bank *bank)
{
struct target *target = bank->target;
if (target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
/* unlock option flash registers */
int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* mass erase flash memory */
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_MER);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_MER | FLASH_STRT);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 100);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_LOCK);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}
static int em357_erase(struct flash_bank *bank, int first, int last)
{
struct target *target = bank->target;
int i;
if (bank->target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if ((first == 0) && (last == (bank->num_sectors - 1)))
return em357_mass_erase(bank);
/* Enable FPEC clock */
target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
/* unlock flash registers */
int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
for (i = first; i <= last; i++) {
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_PER);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_AR,
bank->base + bank->sectors[i].offset);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_PER | FLASH_STRT);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 100);
if (retval != ERROR_OK)
return retval;
bank->sectors[i].is_erased = 1;
}
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_LOCK);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}
static int em357_erase_options(struct flash_bank *bank)
{
struct em357_flash_bank *em357_info = NULL;
struct target *target = bank->target;
em357_info = bank->driver_priv;
/* read current options */
em357_read_options(bank);
/* unlock flash registers */
int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* unlock option flash registers */
retval = target_write_u32(target, EM357_FLASH_OPTKEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_OPTKEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* erase option bytes */
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_OPTER | FLASH_OPTWRE);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_OPTER | FLASH_STRT | FLASH_OPTWRE);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* clear readout protection and complementary option bytes
* this will also force a device unlock if set */
em357_info->option_bytes.RDP = 0x5AA5;
return ERROR_OK;
}
static int em357_write(struct flash_bank *bank, const uint8_t *buffer,
uint32_t offset, uint32_t count)
{
struct target *target = bank->target;
uint32_t words_remaining = (count / 2);
uint32_t bytes_remaining = (count & 0x00000001);
uint32_t address = bank->base + offset;
uint32_t bytes_written = 0;
int retval;
if (bank->target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (offset & 0x1) {
LOG_WARNING("offset 0x%" PRIx32 " breaks required 2-byte alignment", offset);
return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
}
/* unlock flash registers */
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
/* multiple half words (2-byte) to be programmed? */
if (words_remaining > 0) {
/* try using a block write */
retval = em357_write_block(bank, buffer, offset, words_remaining);
if (retval != ERROR_OK) {
if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
/* if block write failed (no sufficient working area),
* we use normal (slow) single dword accesses */
LOG_WARNING(
"couldn't use block writes, falling back to single memory accesses");
}
} else {
buffer += words_remaining * 2;
address += words_remaining * 2;
words_remaining = 0;
}
}
if ((retval != ERROR_OK) && (retval != ERROR_TARGET_RESOURCE_NOT_AVAILABLE))
return retval;
while (words_remaining > 0) {
uint16_t value;
memcpy(&value, buffer + bytes_written, sizeof(uint16_t));
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_PG);
if (retval != ERROR_OK)
return retval;
retval = target_write_u16(target, address, value);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 5);
if (retval != ERROR_OK)
return retval;
bytes_written += 2;
words_remaining--;
address += 2;
}
if (bytes_remaining) {
uint16_t value = 0xffff;
memcpy(&value, buffer + bytes_written, bytes_remaining);
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_PG);
if (retval != ERROR_OK)
return retval;
retval = target_write_u16(target, address, value);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 5);
if (retval != ERROR_OK)
return retval;
}
return target_write_u32(target, EM357_FLASH_CR, FLASH_LOCK);
}
static int em357_write_options(struct flash_bank *bank)
{
struct em357_flash_bank *em357_info = NULL;
struct target *target = bank->target;
em357_info = bank->driver_priv;
/* unlock flash registers */
int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* unlock option flash registers */
retval = target_write_u32(target, EM357_FLASH_OPTKEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_OPTKEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* program option bytes */
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_OPTPG | FLASH_OPTWRE);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* write protection byte 1 */
retval = target_write_u16(target, EM357_OB_WRP0, em357_info->option_bytes.protection[0]);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* write protection byte 2 */
retval = target_write_u16(target, EM357_OB_WRP1, em357_info->option_bytes.protection[1]);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* write protection byte 3 */
retval = target_write_u16(target, EM357_OB_WRP2, em357_info->option_bytes.protection[2]);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* write readout protection bit */
retval = target_write_u16(target, EM357_OB_RDP, em357_info->option_bytes.RDP);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_LOCK);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}
