Ejemplo n.º 1
0
static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf,
					uint32_t irq_status)
{
	bool check_erased_page = false;

	if (irq_status & INTR_STATUS__ECC_ERR) {
		
		uint32_t err_address = 0, err_correction_info = 0;
		uint32_t err_byte = 0, err_sector = 0, err_device = 0;
		uint32_t err_correction_value = 0;
		denali_set_intr_modes(denali, false);

		do {
			err_address = ioread32(denali->flash_reg +
						ECC_ERROR_ADDRESS);
			err_sector = ECC_SECTOR(err_address);
			err_byte = ECC_BYTE(err_address);

			err_correction_info = ioread32(denali->flash_reg +
						ERR_CORRECTION_INFO);
			err_correction_value =
				ECC_CORRECTION_VALUE(err_correction_info);
			err_device = ECC_ERR_DEVICE(err_correction_info);

			if (ECC_ERROR_CORRECTABLE(err_correction_info)) {
				if (err_byte < ECC_SECTOR_SIZE) {
					int offset;
					offset = (err_sector *
							ECC_SECTOR_SIZE +
							err_byte) *
							denali->devnum +
							err_device;
					
					buf[offset] ^= err_correction_value;
					denali->mtd.ecc_stats.corrected++;
				}
			} else {
				check_erased_page = true;
			}
		} while (!ECC_LAST_ERR(err_correction_info));
		while (!(read_interrupt_status(denali) &
				INTR_STATUS__ECC_TRANSACTION_DONE))
			cpu_relax();
		clear_interrupts(denali);
		denali_set_intr_modes(denali, true);
	}
	return check_erased_page;
}
Ejemplo n.º 2
0
static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf,
		       uint32_t irq_status, unsigned int *max_bitflips)
{
	bool check_erased_page = false;
	unsigned int bitflips = 0;

	if (irq_status & INTR_STATUS__ECC_ERR) {
		/* read the ECC errors. we'll ignore them for now */
		uint32_t err_address = 0, err_correction_info = 0;
		uint32_t err_byte = 0, err_sector = 0, err_device = 0;
		uint32_t err_correction_value = 0;
		denali_set_intr_modes(denali, false);

		do {
			err_address = ioread32(denali->flash_reg +
						ECC_ERROR_ADDRESS);
			err_sector = ECC_SECTOR(err_address);
			err_byte = ECC_BYTE(err_address);

			err_correction_info = ioread32(denali->flash_reg +
						ERR_CORRECTION_INFO);
			err_correction_value =
				ECC_CORRECTION_VALUE(err_correction_info);
			err_device = ECC_ERR_DEVICE(err_correction_info);

			if (ECC_ERROR_CORRECTABLE(err_correction_info)) {
				/* If err_byte is larger than ECC_SECTOR_SIZE,
				 * means error happened in OOB, so we ignore
				 * it. It's no need for us to correct it
				 * err_device is represented the NAND error
				 * bits are happened in if there are more
				 * than one NAND connected.
				 * */
				if (err_byte < ECC_SECTOR_SIZE) {
					int offset;
					offset = (err_sector *
							ECC_SECTOR_SIZE +
							err_byte) *
							denali->devnum +
							err_device;
					/* correct the ECC error */
					buf[offset] ^= err_correction_value;
					denali->mtd.ecc_stats.corrected++;
					bitflips++;
				}
			} else {
				/* if the error is not correctable, need to
				 * look at the page to see if it is an erased
				 * page. if so, then it's not a real ECC error
				 * */
				check_erased_page = true;
			}
		} while (!ECC_LAST_ERR(err_correction_info));
		/* Once handle all ecc errors, controller will triger
		 * a ECC_TRANSACTION_DONE interrupt, so here just wait
		 * for a while for this interrupt
		 * */
		while (!(read_interrupt_status(denali) &
				INTR_STATUS__ECC_TRANSACTION_DONE))
			cpu_relax();
		clear_interrupts(denali);
		denali_set_intr_modes(denali, true);
	}
	*max_bitflips = bitflips;
	return check_erased_page;
}