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/*****************************************************************************
* 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 "nand_bcm_umi.h"
/* ---- External Variable Declarations ----------------------------------- */
/* ---- External Function Prototypes ------------------------------------- */
/* ---- Public Variables ------------------------------------------------- */
/* ---- Private Constants and Types -------------------------------------- */
/* ---- Private Function Prototypes -------------------------------------- */
static int bcm_umi_bch_read_page_hwecc(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf, int oob_required, int page);
static int bcm_umi_bch_write_page_hwecc(struct mtd_info *mtd,
struct nand_chip *chip, const uint8_t *buf, int oob_required);
/* ---- Private Variables ------------------------------------------------ */
/*
** nand_hw_eccoob
** New oob placement block for use with hardware ecc generation.
*/
static struct nand_ecclayout nand_hw_eccoob_512 = {
/* Reserve 5 for BI indicator */
.oobfree = {
#if (NAND_ECC_NUM_BYTES > 3)
{.offset = 0, .length = 2}
#else
{.offset = 0, .length = 5},
{.offset = 6, .length = 7}
#endif
}
};
/*
** We treat the OOB for a 2K page as if it were 4 512 byte oobs,
** except the BI is at byte 0.
*/
static struct nand_ecclayout nand_hw_eccoob_2048 = {
/* Reserve 0 as BI indicator */
.oobfree = {
#if (NAND_ECC_NUM_BYTES > 10)
{.offset = 1, .length = 2},
#elif (NAND_ECC_NUM_BYTES > 7)
{.offset = 1, .length = 5},
{.offset = 16, .length = 6},
{.offset = 32, .length = 6},
{.offset = 48, .length = 6}
#else
{.offset = 1, .length = 8},
{.offset = 16, .length = 9},
{.offset = 32, .length = 9},
{.offset = 48, .length = 9}
#endif
}
};
/* We treat the OOB for a 4K page as if it were 8 512 byte oobs,
* except the BI is at byte 0. */
static struct nand_ecclayout nand_hw_eccoob_4096 = {
/* Reserve 0 as BI indicator */
.oobfree = {
#if (NAND_ECC_NUM_BYTES > 10)
{.offset = 1, .length = 2},
{.offset = 16, .length = 3},
{.offset = 32, .length = 3},
{.offset = 48, .length = 3},
{.offset = 64, .length = 3},
{.offset = 80, .length = 3},
{.offset = 96, .length = 3},
{.offset = 112, .length = 3}
#else
{.offset = 1, .length = 5},
{.offset = 16, .length = 6},
{.offset = 32, .length = 6},
{.offset = 48, .length = 6},
{.offset = 64, .length = 6},
{.offset = 80, .length = 6},
{.offset = 96, .length = 6},
{.offset = 112, .length = 6}
#endif
}
};
/* ---- Private Functions ------------------------------------------------ */
/* ==== Public Functions ================================================= */
/****************************************************************************
*
* bcm_umi_bch_read_page_hwecc - hardware ecc based page read function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller expects OOB data read to chip->oob_poi
*
***************************************************************************/
static int bcm_umi_bch_read_page_hwecc(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t * buf,
int oob_required, int page)
{
int sectorIdx = 0;
int eccsize = chip->ecc.size;
int eccsteps = chip->ecc.steps;
uint8_t *datap = buf;
uint8_t eccCalc[NAND_ECC_NUM_BYTES];
int sectorOobSize = mtd->oobsize / eccsteps;
int stat;
unsigned int max_bitflips = 0;
for (sectorIdx = 0; sectorIdx < eccsteps;
sectorIdx++, datap += eccsize) {
if (sectorIdx > 0) {
/* Seek to page location within sector */
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, sectorIdx * eccsize,
-1);
}
/* Enable hardware ECC before reading the buf */
nand_bcm_umi_bch_enable_read_hwecc();
/* Read in data */
bcm_umi_nand_read_buf(mtd, datap, eccsize);
/* Pause hardware ECC after reading the buf */
nand_bcm_umi_bch_pause_read_ecc_calc();
/* Read the OOB ECC */
chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
mtd->writesize + sectorIdx * sectorOobSize, -1);
nand_bcm_umi_bch_read_oobEcc(mtd->writesize, eccCalc,
NAND_ECC_NUM_BYTES,
chip->oob_poi +
sectorIdx * sectorOobSize);
/* Correct any ECC detected errors */
stat =
nand_bcm_umi_bch_correct_page(datap, eccCalc,
NAND_ECC_NUM_BYTES);
/* Update Stats */
if (stat < 0) {
#if defined(NAND_BCM_UMI_DEBUG)
printk(KERN_WARNING "%s uncorr_err sectorIdx=%d\n",
__func__, sectorIdx);
printk(KERN_WARNING "%s data %*ph\n",
__func__, 8, datap);
printk(KERN_WARNING "%s ecc %*ph\n",
__func__, 13, eccCalc);
BUG();
#endif
mtd->ecc_stats.failed++;
} else {
#if defined(NAND_BCM_UMI_DEBUG)
if (stat > 0) {
printk(KERN_INFO
"%s %d correctable_errors detected\n",
__func__, stat);
}
#endif
mtd->ecc_stats.corrected += stat;
max_bitflips = max_t(unsigned int, max_bitflips, stat);
}
}
return max_bitflips;
}
/****************************************************************************
*
* bcm_umi_bch_write_page_hwecc - hardware ecc based page write function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
* @oob_required: must write chip->oob_poi to OOB
*
***************************************************************************/
static int bcm_umi_bch_write_page_hwecc(struct mtd_info *mtd,
struct nand_chip *chip, const uint8_t *buf, int oob_required)
{
int sectorIdx = 0;
int eccsize = chip->ecc.size;
int eccsteps = chip->ecc.steps;
const uint8_t *datap = buf;
uint8_t *oobp = chip->oob_poi;
int sectorOobSize = mtd->oobsize / eccsteps;
for (sectorIdx = 0; sectorIdx < eccsteps;
sectorIdx++, datap += eccsize, oobp += sectorOobSize) {
/* Enable hardware ECC before writing the buf */
nand_bcm_umi_bch_enable_write_hwecc();
bcm_umi_nand_write_buf(mtd, datap, eccsize);
nand_bcm_umi_bch_write_oobEcc(mtd->writesize, oobp,
NAND_ECC_NUM_BYTES);
}
bcm_umi_nand_write_buf(mtd, chip->oob_poi, mtd->oobsize);
return 0;
}
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