You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
149 lines
4.9 KiB
149 lines
4.9 KiB
/*****************************************************************************
|
|
* Copyright 2004 - 2009 Broadcom Corporation. All rights reserved.
|
|
*
|
|
* Unless you and Broadcom execute a separate written software license
|
|
* agreement governing use of this software, this software is licensed to you
|
|
* under the terms of the GNU General Public License version 2, available at
|
|
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
|
|
*
|
|
* Notwithstanding the above, under no circumstances may you combine this
|
|
* software in any way with any other Broadcom software provided under a
|
|
* license other than the GPL, without Broadcom's express prior written
|
|
* consent.
|
|
*****************************************************************************/
|
|
|
|
/* ---- Include Files ---------------------------------------------------- */
|
|
#include <mach/reg_umi.h>
|
|
#include "nand_bcm_umi.h"
|
|
#ifdef BOOT0_BUILD
|
|
#include <uart.h>
|
|
#endif
|
|
|
|
/* ---- External Variable Declarations ----------------------------------- */
|
|
/* ---- External Function Prototypes ------------------------------------- */
|
|
/* ---- Public Variables ------------------------------------------------- */
|
|
/* ---- Private Constants and Types -------------------------------------- */
|
|
/* ---- Private Function Prototypes -------------------------------------- */
|
|
/* ---- Private Variables ------------------------------------------------ */
|
|
/* ---- Private Functions ------------------------------------------------ */
|
|
|
|
#if NAND_ECC_BCH
|
|
/****************************************************************************
|
|
* nand_bch_ecc_flip_bit - Routine to flip an errored bit
|
|
*
|
|
* PURPOSE:
|
|
* This is a helper routine that flips the bit (0 -> 1 or 1 -> 0) of the
|
|
* errored bit specified
|
|
*
|
|
* PARAMETERS:
|
|
* datap - Container that holds the 512 byte data
|
|
* errorLocation - Location of the bit that needs to be flipped
|
|
*
|
|
* RETURNS:
|
|
* None
|
|
****************************************************************************/
|
|
static void nand_bcm_umi_bch_ecc_flip_bit(uint8_t *datap, int errorLocation)
|
|
{
|
|
int locWithinAByte = (errorLocation & REG_UMI_BCH_ERR_LOC_BYTE) >> 0;
|
|
int locWithinAWord = (errorLocation & REG_UMI_BCH_ERR_LOC_WORD) >> 3;
|
|
int locWithinAPage = (errorLocation & REG_UMI_BCH_ERR_LOC_PAGE) >> 5;
|
|
|
|
uint8_t errorByte = 0;
|
|
uint8_t byteMask = 1 << locWithinAByte;
|
|
|
|
/* BCH uses big endian, need to change the location
|
|
* bits to little endian */
|
|
locWithinAWord = 3 - locWithinAWord;
|
|
|
|
errorByte = datap[locWithinAPage * sizeof(uint32_t) + locWithinAWord];
|
|
|
|
#ifdef BOOT0_BUILD
|
|
puthexs("\nECC Correct Offset: ",
|
|
locWithinAPage * sizeof(uint32_t) + locWithinAWord);
|
|
puthexs(" errorByte:", errorByte);
|
|
puthex8(" Bit: ", locWithinAByte);
|
|
#endif
|
|
|
|
if (errorByte & byteMask) {
|
|
/* bit needs to be cleared */
|
|
errorByte &= ~byteMask;
|
|
} else {
|
|
/* bit needs to be set */
|
|
errorByte |= byteMask;
|
|
}
|
|
|
|
/* write back the value with the fixed bit */
|
|
datap[locWithinAPage * sizeof(uint32_t) + locWithinAWord] = errorByte;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* nand_correct_page_bch - Routine to correct bit errors when reading NAND
|
|
*
|
|
* PURPOSE:
|
|
* This routine reads the BCH registers to determine if there are any bit
|
|
* errors during the read of the last 512 bytes of data + ECC bytes. If
|
|
* errors exists, the routine fixes it.
|
|
*
|
|
* PARAMETERS:
|
|
* datap - Container that holds the 512 byte data
|
|
*
|
|
* RETURNS:
|
|
* 0 or greater = Number of errors corrected
|
|
* (No errors are found or errors have been fixed)
|
|
* -1 = Error(s) cannot be fixed
|
|
****************************************************************************/
|
|
int nand_bcm_umi_bch_correct_page(uint8_t *datap, uint8_t *readEccData,
|
|
int numEccBytes)
|
|
{
|
|
int numErrors;
|
|
int errorLocation;
|
|
int idx;
|
|
uint32_t regValue;
|
|
|
|
/* wait for read ECC to be valid */
|
|
regValue = nand_bcm_umi_bch_poll_read_ecc_calc();
|
|
|
|
/*
|
|
* read the control status register to determine if there
|
|
* are error'ed bits
|
|
* see if errors are correctible
|
|
*/
|
|
if ((regValue & REG_UMI_BCH_CTRL_STATUS_UNCORR_ERR) > 0) {
|
|
int i;
|
|
|
|
for (i = 0; i < numEccBytes; i++) {
|
|
if (readEccData[i] != 0xff) {
|
|
/* errors cannot be fixed, return -1 */
|
|
return -1;
|
|
}
|
|
}
|
|
/* If ECC is unprogrammed then we can't correct,
|
|
* assume everything OK */
|
|
return 0;
|
|
}
|
|
|
|
if ((regValue & REG_UMI_BCH_CTRL_STATUS_CORR_ERR) == 0) {
|
|
/* no errors */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Fix errored bits by doing the following:
|
|
* 1. Read the number of errors in the control and status register
|
|
* 2. Read the error location registers that corresponds to the number
|
|
* of errors reported
|
|
* 3. Invert the bit in the data
|
|
*/
|
|
numErrors = (regValue & REG_UMI_BCH_CTRL_STATUS_NB_CORR_ERROR) >> 20;
|
|
|
|
for (idx = 0; idx < numErrors; idx++) {
|
|
errorLocation =
|
|
REG_UMI_BCH_ERR_LOC_ADDR(idx) & REG_UMI_BCH_ERR_LOC_MASK;
|
|
|
|
/* Flip bit */
|
|
nand_bcm_umi_bch_ecc_flip_bit(datap, errorLocation);
|
|
}
|
|
/* Errors corrected */
|
|
return numErrors;
|
|
}
|
|
#endif
|
|
|