mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 07:34:31 +00:00
7c27b7b1ea
This is a patch to use the hardware ECC controller of the AT91SAM9260 for the AT91 nand. Taken from the kernel 2.6.33. Signed-off-by: Nikolay Petukhov <Nikolay.Petukhov@gmail.com>
343 lines
8.7 KiB
C
343 lines
8.7 KiB
C
/*
|
|
* (C) Copyright 2007-2008
|
|
* Stelian Pop <stelian.pop@leadtechdesign.com>
|
|
* Lead Tech Design <www.leadtechdesign.com>
|
|
*
|
|
* (C) Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/arch/gpio.h>
|
|
#include <asm/arch/at91_pio.h>
|
|
|
|
#include <nand.h>
|
|
|
|
#ifdef CONFIG_ATMEL_NAND_HWECC
|
|
|
|
/* Register access macros */
|
|
#define ecc_readl(add, reg) \
|
|
readl(AT91_BASE_SYS + add + ATMEL_ECC_##reg)
|
|
#define ecc_writel(add, reg, value) \
|
|
writel((value), AT91_BASE_SYS + add + ATMEL_ECC_##reg)
|
|
|
|
#include "atmel_nand_ecc.h" /* Hardware ECC registers */
|
|
|
|
/* oob layout for large page size
|
|
* bad block info is on bytes 0 and 1
|
|
* the bytes have to be consecutives to avoid
|
|
* several NAND_CMD_RNDOUT during read
|
|
*/
|
|
static struct nand_ecclayout atmel_oobinfo_large = {
|
|
.eccbytes = 4,
|
|
.eccpos = {60, 61, 62, 63},
|
|
.oobfree = {
|
|
{2, 58}
|
|
},
|
|
};
|
|
|
|
/* oob layout for small page size
|
|
* bad block info is on bytes 4 and 5
|
|
* the bytes have to be consecutives to avoid
|
|
* several NAND_CMD_RNDOUT during read
|
|
*/
|
|
static struct nand_ecclayout atmel_oobinfo_small = {
|
|
.eccbytes = 4,
|
|
.eccpos = {0, 1, 2, 3},
|
|
.oobfree = {
|
|
{6, 10}
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Calculate HW ECC
|
|
*
|
|
* function called after a write
|
|
*
|
|
* mtd: MTD block structure
|
|
* dat: raw data (unused)
|
|
* ecc_code: buffer for ECC
|
|
*/
|
|
static int atmel_nand_calculate(struct mtd_info *mtd,
|
|
const u_char *dat, unsigned char *ecc_code)
|
|
{
|
|
struct nand_chip *nand_chip = mtd->priv;
|
|
unsigned int ecc_value;
|
|
|
|
/* get the first 2 ECC bytes */
|
|
ecc_value = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR);
|
|
|
|
ecc_code[0] = ecc_value & 0xFF;
|
|
ecc_code[1] = (ecc_value >> 8) & 0xFF;
|
|
|
|
/* get the last 2 ECC bytes */
|
|
ecc_value = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, NPR) & ATMEL_ECC_NPARITY;
|
|
|
|
ecc_code[2] = ecc_value & 0xFF;
|
|
ecc_code[3] = (ecc_value >> 8) & 0xFF;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* HW ECC read page function
|
|
*
|
|
* mtd: mtd info structure
|
|
* chip: nand chip info structure
|
|
* buf: buffer to store read data
|
|
*/
|
|
static int atmel_nand_read_page(struct mtd_info *mtd,
|
|
struct nand_chip *chip, uint8_t *buf, int page)
|
|
{
|
|
int eccsize = chip->ecc.size;
|
|
int eccbytes = chip->ecc.bytes;
|
|
uint32_t *eccpos = chip->ecc.layout->eccpos;
|
|
uint8_t *p = buf;
|
|
uint8_t *oob = chip->oob_poi;
|
|
uint8_t *ecc_pos;
|
|
int stat;
|
|
|
|
/* read the page */
|
|
chip->read_buf(mtd, p, eccsize);
|
|
|
|
/* move to ECC position if needed */
|
|
if (eccpos[0] != 0) {
|
|
/* This only works on large pages
|
|
* because the ECC controller waits for
|
|
* NAND_CMD_RNDOUTSTART after the
|
|
* NAND_CMD_RNDOUT.
|
|
* anyway, for small pages, the eccpos[0] == 0
|
|
*/
|
|
chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
|
|
mtd->writesize + eccpos[0], -1);
|
|
}
|
|
|
|
/* the ECC controller needs to read the ECC just after the data */
|
|
ecc_pos = oob + eccpos[0];
|
|
chip->read_buf(mtd, ecc_pos, eccbytes);
|
|
|
|
/* check if there's an error */
|
|
stat = chip->ecc.correct(mtd, p, oob, NULL);
|
|
|
|
if (stat < 0)
|
|
mtd->ecc_stats.failed++;
|
|
else
|
|
mtd->ecc_stats.corrected += stat;
|
|
|
|
/* get back to oob start (end of page) */
|
|
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
|
|
|
|
/* read the oob */
|
|
chip->read_buf(mtd, oob, mtd->oobsize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* HW ECC Correction
|
|
*
|
|
* function called after a read
|
|
*
|
|
* mtd: MTD block structure
|
|
* dat: raw data read from the chip
|
|
* read_ecc: ECC from the chip (unused)
|
|
* isnull: unused
|
|
*
|
|
* Detect and correct a 1 bit error for a page
|
|
*/
|
|
static int atmel_nand_correct(struct mtd_info *mtd, u_char *dat,
|
|
u_char *read_ecc, u_char *isnull)
|
|
{
|
|
struct nand_chip *nand_chip = mtd->priv;
|
|
unsigned int ecc_status, ecc_parity, ecc_mode;
|
|
unsigned int ecc_word, ecc_bit;
|
|
|
|
/* get the status from the Status Register */
|
|
ecc_status = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, SR);
|
|
|
|
/* if there's no error */
|
|
if (likely(!(ecc_status & ATMEL_ECC_RECERR)))
|
|
return 0;
|
|
|
|
/* get error bit offset (4 bits) */
|
|
ecc_bit = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR) & ATMEL_ECC_BITADDR;
|
|
/* get word address (12 bits) */
|
|
ecc_word = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR) & ATMEL_ECC_WORDADDR;
|
|
ecc_word >>= 4;
|
|
|
|
/* if there are multiple errors */
|
|
if (ecc_status & ATMEL_ECC_MULERR) {
|
|
/* check if it is a freshly erased block
|
|
* (filled with 0xff) */
|
|
if ((ecc_bit == ATMEL_ECC_BITADDR)
|
|
&& (ecc_word == (ATMEL_ECC_WORDADDR >> 4))) {
|
|
/* the block has just been erased, return OK */
|
|
return 0;
|
|
}
|
|
/* it doesn't seems to be a freshly
|
|
* erased block.
|
|
* We can't correct so many errors */
|
|
printk(KERN_WARNING "atmel_nand : multiple errors detected."
|
|
" Unable to correct.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* if there's a single bit error : we can correct it */
|
|
if (ecc_status & ATMEL_ECC_ECCERR) {
|
|
/* there's nothing much to do here.
|
|
* the bit error is on the ECC itself.
|
|
*/
|
|
printk(KERN_WARNING "atmel_nand : one bit error on ECC code."
|
|
" Nothing to correct\n");
|
|
return 0;
|
|
}
|
|
|
|
printk(KERN_WARNING "atmel_nand : one bit error on data."
|
|
" (word offset in the page :"
|
|
" 0x%x bit offset : 0x%x)\n",
|
|
ecc_word, ecc_bit);
|
|
/* correct the error */
|
|
if (nand_chip->options & NAND_BUSWIDTH_16) {
|
|
/* 16 bits words */
|
|
((unsigned short *) dat)[ecc_word] ^= (1 << ecc_bit);
|
|
} else {
|
|
/* 8 bits words */
|
|
dat[ecc_word] ^= (1 << ecc_bit);
|
|
}
|
|
printk(KERN_WARNING "atmel_nand : error corrected\n");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Enable HW ECC : unused on most chips
|
|
*/
|
|
static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static void at91_nand_hwcontrol(struct mtd_info *mtd,
|
|
int cmd, unsigned int ctrl)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
|
|
if (ctrl & NAND_CTRL_CHANGE) {
|
|
ulong IO_ADDR_W = (ulong) this->IO_ADDR_W;
|
|
IO_ADDR_W &= ~(CONFIG_SYS_NAND_MASK_ALE
|
|
| CONFIG_SYS_NAND_MASK_CLE);
|
|
|
|
if (ctrl & NAND_CLE)
|
|
IO_ADDR_W |= CONFIG_SYS_NAND_MASK_CLE;
|
|
if (ctrl & NAND_ALE)
|
|
IO_ADDR_W |= CONFIG_SYS_NAND_MASK_ALE;
|
|
|
|
at91_set_gpio_value(CONFIG_SYS_NAND_ENABLE_PIN,
|
|
!(ctrl & NAND_NCE));
|
|
this->IO_ADDR_W = (void *) IO_ADDR_W;
|
|
}
|
|
|
|
if (cmd != NAND_CMD_NONE)
|
|
writeb(cmd, this->IO_ADDR_W);
|
|
}
|
|
|
|
#ifdef CONFIG_SYS_NAND_READY_PIN
|
|
static int at91_nand_ready(struct mtd_info *mtd)
|
|
{
|
|
return at91_get_gpio_value(CONFIG_SYS_NAND_READY_PIN);
|
|
}
|
|
#endif
|
|
|
|
int board_nand_init(struct nand_chip *nand)
|
|
{
|
|
#ifdef CONFIG_ATMEL_NAND_HWECC
|
|
static int chip_nr = 0;
|
|
struct mtd_info *mtd;
|
|
#endif
|
|
|
|
nand->ecc.mode = NAND_ECC_SOFT;
|
|
#ifdef CONFIG_SYS_NAND_DBW_16
|
|
nand->options = NAND_BUSWIDTH_16;
|
|
#endif
|
|
nand->cmd_ctrl = at91_nand_hwcontrol;
|
|
#ifdef CONFIG_SYS_NAND_READY_PIN
|
|
nand->dev_ready = at91_nand_ready;
|
|
#endif
|
|
nand->chip_delay = 20;
|
|
|
|
#ifdef CONFIG_ATMEL_NAND_HWECC
|
|
nand->ecc.mode = NAND_ECC_HW;
|
|
nand->ecc.calculate = atmel_nand_calculate;
|
|
nand->ecc.correct = atmel_nand_correct;
|
|
nand->ecc.hwctl = atmel_nand_hwctl;
|
|
nand->ecc.read_page = atmel_nand_read_page;
|
|
nand->ecc.bytes = 4;
|
|
#endif
|
|
|
|
#ifdef CONFIG_ATMEL_NAND_HWECC
|
|
mtd = &nand_info[chip_nr++];
|
|
mtd->priv = nand;
|
|
|
|
/* Detect NAND chips */
|
|
if (nand_scan_ident(mtd, 1)) {
|
|
printk(KERN_WARNING "NAND Flash not found !\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (nand->ecc.mode == NAND_ECC_HW) {
|
|
/* ECC is calculated for the whole page (1 step) */
|
|
nand->ecc.size = mtd->writesize;
|
|
|
|
/* set ECC page size and oob layout */
|
|
switch (mtd->writesize) {
|
|
case 512:
|
|
nand->ecc.layout = &atmel_oobinfo_small;
|
|
ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR, ATMEL_ECC_PAGESIZE_528);
|
|
break;
|
|
case 1024:
|
|
nand->ecc.layout = &atmel_oobinfo_large;
|
|
ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR, ATMEL_ECC_PAGESIZE_1056);
|
|
break;
|
|
case 2048:
|
|
nand->ecc.layout = &atmel_oobinfo_large;
|
|
ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR, ATMEL_ECC_PAGESIZE_2112);
|
|
break;
|
|
case 4096:
|
|
nand->ecc.layout = &atmel_oobinfo_large;
|
|
ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR, ATMEL_ECC_PAGESIZE_4224);
|
|
break;
|
|
default:
|
|
/* page size not handled by HW ECC */
|
|
/* switching back to soft ECC */
|
|
nand->ecc.mode = NAND_ECC_SOFT;
|
|
nand->ecc.calculate = NULL;
|
|
nand->ecc.correct = NULL;
|
|
nand->ecc.hwctl = NULL;
|
|
nand->ecc.read_page = NULL;
|
|
nand->ecc.postpad = 0;
|
|
nand->ecc.prepad = 0;
|
|
nand->ecc.bytes = 0;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|