/*
* Copyright (C) 2003 Rick Bronson
*
* Derived from drivers/mtd/nand/autcpu12.c
* Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
*
* Derived from drivers/mtd/spia.c
* Copyright (C) 2000 Steven J. Hill (sjhill@cotw.com)
*
*
* Add Hardware ECC support for AT91SAM9260 / AT91SAM9263
* Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright (C) 2007
*
* Derived from Das U-Boot source code
* (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c)
* (C) Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <common.h>
#include <driver.h>
#include <malloc.h>
#include <init.h>
#include <gpio.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <io.h>
#include <mach/board.h>
#include <errno.h>
/* Register access macros */
#define ecc_readl(add, reg) \
readl(add + ATMEL_ECC_##reg)
#define ecc_writel(add, reg, value) \
writel((value), 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}
},
};
struct atmel_nand_host {
struct nand_chip nand_chip;
struct mtd_info mtd;
void __iomem *io_base;
struct atmel_nand_data *board;
struct device_d *dev;
void __iomem *ecc;
int pmecc_bytes_per_sector;
int pmecc_sector_number;
int pmecc_degree; /* Degree of remainders */
int pmecc_cw_len; /* Length of codeword */
void __iomem *pmerrloc_base;
void __iomem *pmecc_rom_base;
/* lookup table for alpha_to and index_of */
void __iomem *pmecc_alpha_to;
void __iomem *pmecc_index_of;
/* data for pmecc computation */
int16_t *pmecc_partial_syn;
int16_t *pmecc_si;
int16_t *pmecc_smu; /* Sigma table */
int16_t *pmecc_lmu; /* polynomal order */
int *pmecc_mu;
int *pmecc_dmu;
int *pmecc_delta;
};
static struct nand_ecclayout atmel_pmecc_oobinfo;
/*
* Enable NAND.
*/
static void atmel_nand_enable(struct atmel_nand_host *host)
{
if (gpio_is_valid(host->board->enable_pin))
gpio_set_value(host->board->enable_pin, 0);
}
/*
* Disable NAND.
*/
static void atmel_nand_disable(struct atmel_nand_host *host)
{
if (gpio_is_valid(host->board->enable_pin))
gpio_set_value(host->board->enable_pin, 1);
}
/*
* Hardware specific access to control-lines
*/
static void atmel_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
if (ctrl & NAND_CTRL_CHANGE) {
if (ctrl & NAND_NCE)
atmel_nand_enable(host);
else
atmel_nand_disable(host);
}
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
writeb(cmd, host->io_base + (1 << host->board->cle));
else
writeb(cmd, host->io_base + (1 << host->board->ale));
}
/*
* Read the Device Ready pin.
*/
static int atmel_nand_device_ready(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
return gpio_get_value(host->board->rdy_pin);
}
/*
* Minimal-overhead PIO for data access.
*/
static void atmel_read_buf(struct mtd_info *mtd, u8 *buf, int len)
{
struct nand_chip *nand_chip = mtd->priv;
readsb(nand_chip->IO_ADDR_R, buf, len);
}
static void atmel_read_buf16(struct mtd_info *mtd, u8 *buf, int len)
{
struct nand_chip *nand_chip = mtd->priv;
readsw(nand_chip->IO_ADDR_R, buf, len / 2);
}
static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
{
struct nand_chip *nand_chip = mtd->priv;
writesb(nand_chip->IO_ADDR_W, buf, len);
}
static void atmel_write_buf16(struct mtd_info *mtd, const u8 *buf, int len)
{
struct nand_chip *nand_chip = mtd->priv;
writesw(nand_chip->IO_ADDR_W, buf, len / 2);
}
/*
* Return number of ecc bytes per sector according to sector size and
* correction capability
*
* Following table shows what at91 PMECC supported:
* Correction Capability Sector_512_bytes Sector_1024_bytes
* ===================== ================ =================
* 2-bits 4-bytes 4-bytes
* 4-bits 7-bytes 7-bytes
* 8-bits 13-bytes 14-bytes
* 12-bits 20-bytes 21-bytes
* 24-bits 39-bytes 42-bytes
*/
static int pmecc_get_ecc_bytes(int cap, int sector_size)
{
int m = 12 + sector_size / 512;
return (m * cap + 7) / 8;
}
static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
int oobsize, int ecc_len)
{
int i;
layout->eccbytes = ecc_len;
/* ECC will occupy the last ecc_len bytes continuously */
for (i = 0; i < ecc_len; i++)
layout->eccpos[i] = oobsize - ecc_len + i;
layout->oobfree[0].offset = 2;
layout->oobfree[0].length =
oobsize - ecc_len - layout->oobfree[0].offset;
}
static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
{
int table_size;
table_size = host->board->pmecc_sector_size == 512 ?
PMECC_LOOKUP_TABLE_SIZE_512 : PMECC_LOOKUP_TABLE_SIZE_1024;
return host->pmecc_rom_base + host->board->pmecc_lookup_table_offset +
table_size * sizeof(int16_t);
}
static void pmecc_data_free(struct atmel_nand_host *host)
{
kfree(host->pmecc_partial_syn);
kfree(host->pmecc_si);
kfree(host->pmecc_lmu);
kfree(host->pmecc_smu);
kfree(host->pmecc_mu);
kfree(host->pmecc_dmu);
kfree(host->pmecc_delta);
}
static int pmecc_data_alloc(struct atmel_nand_host *host)
{
const int cap = host->board->pmecc_corr_cap;
host->pmecc_partial_syn = kzalloc((2 * cap + 1) * sizeof(int16_t),
GFP_KERNEL);
host->pmecc_si = kzalloc((2 * cap + 1) * sizeof(int16_t), GFP_KERNEL);
host->pmecc_lmu = kzalloc((cap + 1) * sizeof(int16_t), GFP_KERNEL);
host->pmecc_smu = kzalloc((cap + 2) * (2 * cap + 1) * sizeof(int16_t),
GFP_KERNEL);
host->pmecc_mu = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL);
host->pmecc_dmu = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL);
host->pmecc_delta = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL);
if (host->pmecc_partial_syn &&
host->pmecc_si &&
host->pmecc_lmu &&
host->pmecc_smu &&
host->pmecc_mu &&
host->pmecc_dmu &&
host->pmecc_delta)
return 0;
/* error happened */
pmecc_data_free(host);
return -ENOMEM;
}
static void pmecc_gen_syndrome(struct mtd_info *mtd, int sector)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
int i;
uint32_t value;
/* Fill odd syndromes */
for (i = 0; i < host->board->pmecc_corr_cap; i++) {
value = pmecc_readl_rem_relaxed(host->ecc, sector, i / 2);
if (i & 1)
value >>= 16;
value &= 0xffff;
host->pmecc_partial_syn[(2 * i) + 1] = (int16_t)value;
}
}
static void pmecc_substitute(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
int16_t __iomem *alpha_to = host->pmecc_alpha_to;
int16_t __iomem *index_of = host->pmecc_index_of;
int16_t *partial_syn = host->pmecc_partial_syn;
const int cap = host->board->pmecc_corr_cap;
int16_t *si;
int i, j;
/* si[] is a table that holds the current syndrome value,
* an element of that table belongs to the field
*/
si = host->pmecc_si;
memset(&si[1], 0, sizeof(int16_t) * (2 * cap - 1));
/* Computation 2t syndromes based on S(x) */
/* Odd syndromes */
for (i = 1; i < 2 * cap; i += 2) {
for (j = 0; j < host->pmecc_degree; j++) {
if (partial_syn[i] & ((unsigned short)0x1 << j))
si[i] = readw(alpha_to + i * j) ^ si[i];
}
}
/* Even syndrome = (Odd syndrome) ** 2 */
for (i = 2, j = 1; j <= cap; i = ++j << 1) {
if (si[j] == 0) {
si[i] = 0;
} else {
int16_t tmp;
tmp = readw(index_of + si[j]);
tmp = (tmp * 2) % host->pmecc_cw_len;
si[i] = readw(alpha_to + tmp);
}
}
return;
}
static void pmecc_get_sigma(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
int16_t *lmu = host->pmecc_lmu;
int16_t *si = host->pmecc_si;
int *mu = host->pmecc_mu;
int *dmu = host->pmecc_dmu; /* Discrepancy */
int *delta = host->pmecc_delta; /* Delta order */
int cw_len = host->pmecc_cw_len;
const int16_t cap = host->board->pmecc_corr_cap;
const int num = 2 * cap + 1;
int16_t __iomem *index_of = host->pmecc_index_of;
int16_t __iomem *alpha_to = host->pmecc_alpha_to;
int i, j, k;
uint32_t dmu_0_count, tmp;
int16_t *smu = host->pmecc_smu;
/* index of largest delta */
int ro;
int largest;
int diff;
dmu_0_count = 0;
/* First Row */
/* Mu */
mu[0] = -1;
memset(smu, 0, sizeof(int16_t) * num);
smu[0] = 1;
/* discrepancy set to 1 */
dmu[0] = 1;
/* polynom order set to 0 */
lmu[0] = 0;
delta[0] = (mu[0] * 2 - lmu[0]) >> 1;
/* Second Row */
/* Mu */
mu[1] = 0;
/* Sigma(x) set to 1 */
memset(&smu[num], 0, sizeof(int16_t) * num);
smu[num] = 1;
/* discrepancy set to S1 */
dmu[1] = si[1];
/* polynom order set to 0 */
lmu[1] = 0;
delta[1] = (mu[1] * 2 - lmu[1]) >> 1;
/* Init the Sigma(x) last row */
memset(&smu[(cap + 1) * num], 0, sizeof(int16_t) * num);
for (i = 1; i <= cap; i++) {
mu[i + 1] = i << 1;
/* Begin Computing Sigma (Mu+1) and L(mu) */
/* check if discrepancy is set to 0 */
if (dmu[i] == 0) {
dmu_0_count++;
tmp = ((cap - (lmu[i] >> 1) - 1) / 2);
if ((cap - (lmu[i] >> 1) - 1) & 0x1)
tmp += 2;
else
tmp += 1;
if (dmu_0_count == tmp) {
for (j = 0; j <= (lmu[i] >> 1) + 1; j++)
smu[(cap + 1) * num + j] =
smu[i * num + j];
lmu[cap + 1] = lmu[i];
return;
}
/* copy polynom */
for (j = 0; j <= lmu[i] >> 1; j++)
smu[(i + 1) * num + j] = smu[i * num + j];
/* copy previous polynom order to the next */
lmu[i + 1] = lmu[i];
} else {
ro = 0;
largest = -1;
/* find largest delta with dmu != 0 */
for (j = 0; j < i; j++) {
if ((dmu[j]) && (delta[j] > largest)) {
largest = delta[j];
ro = j;
}
}
/* compute difference */
diff = (mu[i] - mu[ro]);
/* Compute degree of the new smu polynomial */
if ((lmu[i] >> 1) > ((lmu[ro] >> 1) + diff))
lmu[i + 1] = lmu[i];
else
lmu[i + 1] = ((lmu[ro] >> 1) + diff) * 2;
/* Init smu[i+1] with 0 */
for (k = 0; k < num; k++)
smu[(i + 1) * num + k] = 0;
/* Compute smu[i+1] */
for (k = 0; k <= lmu[ro] >> 1; k++) {
int16_t a, b, c;
if (!(smu[ro * num + k] && dmu[i]))
continue;
a = readw(index_of + dmu[i]);
b = readw(index_of + dmu[ro]);
c = readw(index_of + smu[ro * num + k]);
tmp = a + (cw_len - b) + c;
a = readw(alpha_to + tmp % cw_len);
smu[(i + 1) * num + (k + diff)] = a;
}
for (k = 0; k <= lmu[i] >> 1; k++)
smu[(i + 1) * num + k] ^= smu[i * num + k];
}
/* End Computing Sigma (Mu+1) and L(mu) */
/* In either case compute delta */
delta[i + 1] = (mu[i + 1] * 2 - lmu[i + 1]) >> 1;
/* Do not compute discrepancy for the last iteration */
if (i >= cap)
continue;
for (k = 0; k <= (lmu[i + 1] >> 1); k++) {
tmp = 2 * (i - 1);
if (k == 0) {
dmu[i + 1] = si[tmp + 3];
} else if (smu[(i + 1) * num + k] && si[tmp + 3 - k]) {
int16_t a, b, c;
a = readw(index_of +
smu[(i + 1) * num + k]);
b = si[2 * (i - 1) + 3 - k];
c = readw(index_of + b);
tmp = a + c;
tmp %= cw_len;
dmu[i + 1] = readw(alpha_to + tmp) ^
dmu[i + 1];
}
}
}
return;
}
static int pmecc_err_location(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
const int cap = host->board->pmecc_corr_cap;
const int num = 2 * cap + 1;
int sector_size = host->board->pmecc_sector_size;
int err_nbr = 0; /* number of error */
int roots_nbr; /* number of roots */
int i, ret;
uint32_t val;
int16_t *smu = host->pmecc_smu;
pmerrloc_writel(host->pmerrloc_base, ELDIS, PMERRLOC_DISABLE);
for (i = 0; i <= host->pmecc_lmu[cap + 1] >> 1; i++) {
pmerrloc_writel_sigma_relaxed(host->pmerrloc_base, i,
smu[(cap + 1) * num + i]);
err_nbr++;
}
val = (err_nbr - 1) << 16;
if (sector_size == 1024)
val |= 1;
pmerrloc_writel(host->pmerrloc_base, ELCFG, val);
pmerrloc_writel(host->pmerrloc_base, ELEN,
sector_size * 8 + host->pmecc_degree * cap);
ret = wait_on_timeout(PMECC_MAX_TIMEOUT_MS,
pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR)
& PMERRLOC_CALC_DONE);
if (ret) {
dev_err(host->dev, "PMECC: Timeout to calculate error location.\n");
return -ETIMEDOUT;
}
roots_nbr = (pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR)
& PMERRLOC_ERR_NUM_MASK) >> 8;
/* Number of roots == degree of smu hence <= cap */
if (roots_nbr == host->pmecc_lmu[cap + 1] >> 1)
return err_nbr - 1;
/* Number of roots does not match the degree of smu
* unable to correct error */
return -1;
}
static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
int sector_num, int extra_bytes, int err_nbr)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
int i = 0;
int byte_pos, bit_pos, sector_size, pos;
uint32_t tmp;
uint8_t err_byte;
sector_size = host->board->pmecc_sector_size;
while (err_nbr) {
tmp = pmerrloc_readl_el_relaxed(host->pmerrloc_base, i) - 1;
byte_pos = tmp / 8;
bit_pos = tmp % 8;
if (byte_pos >= (sector_size + extra_bytes))
BUG(); /* should never happen */
if (byte_pos < sector_size) {
err_byte = *(buf + byte_pos);
*(buf + byte_pos) ^= (1 << bit_pos);
pos = sector_num * host->board->pmecc_sector_size + byte_pos;
dev_info(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
pos, bit_pos, err_byte, *(buf + byte_pos));
} else {
/* Bit flip in OOB area */
tmp = sector_num * host->pmecc_bytes_per_sector
+ (byte_pos - sector_size);
err_byte = ecc[tmp];
ecc[tmp] ^= (1 << bit_pos);
pos = tmp + nand_chip->ecc.layout->eccpos[0];
dev_info(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
pos, bit_pos, err_byte, ecc[tmp]);
}
i++;
err_nbr--;
}
return;
}
static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf,
u8 *ecc)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
int i, err_nbr, eccbytes;
uint8_t *buf_pos;
eccbytes = nand_chip->ecc.bytes;
for (i = 0; i < eccbytes; i++)
if (ecc[i] != 0xff)
goto normal_check;
/* Erased page, return OK */
return 0;
normal_check:
for (i = 0; i < host->pmecc_sector_number; i++) {
err_nbr = 0;
if (pmecc_stat & 0x1) {
buf_pos = buf + i * host->board->pmecc_sector_size;
pmecc_gen_syndrome(mtd, i);
pmecc_substitute(mtd);
pmecc_get_sigma(mtd);
err_nbr = pmecc_err_location(mtd);
if (err_nbr == -1) {
dev_err(host->dev, "PMECC: Too many errors\n");
mtd->ecc_stats.failed++;
return -EIO;
} else {
pmecc_correct_data(mtd, buf_pos, ecc, i,
host->pmecc_bytes_per_sector, err_nbr);
mtd->ecc_stats.corrected += err_nbr;
}
}
pmecc_stat >>= 1;
}
return 0;
}
static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
{
struct atmel_nand_host *host = chip->priv;
int eccsize = chip->ecc.size;
uint8_t *oob = chip->oob_poi;
uint32_t *eccpos = chip->ecc.layout->eccpos;
uint32_t stat;
int ret;
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
pmecc_writel(host->ecc, CFG, (pmecc_readl_relaxed(host->ecc, CFG)
& ~PMECC_CFG_WRITE_OP) | PMECC_CFG_AUTO_ENABLE);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DATA);
chip->read_buf(mtd, buf, eccsize);
chip->read_buf(mtd, oob, mtd->oobsize);
ret = wait_on_timeout(PMECC_MAX_TIMEOUT_MS,
!(pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY));
if (ret) {
dev_err(host->dev, "PMECC: Timeout to calculate error location.\n");
return -ETIMEDOUT;
}
stat = pmecc_readl_relaxed(host->ecc, ISR);
if (stat != 0)
if (pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]) != 0)
return -EIO;
return 0;
}
static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
struct nand_chip *chip, const uint8_t *buf,
int oob_required)
{
struct atmel_nand_host *host = chip->priv;
uint32_t *eccpos = chip->ecc.layout->eccpos;
int i, j, ret;
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
pmecc_writel(host->ecc, CFG, (pmecc_readl_relaxed(host->ecc, CFG) |
PMECC_CFG_WRITE_OP) & ~PMECC_CFG_AUTO_ENABLE);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DATA);
chip->write_buf(mtd, (u8 *)buf, mtd->writesize);
ret = wait_on_timeout(PMECC_MAX_TIMEOUT_MS,
!(pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY));
if (ret) {
dev_err(host->dev, "PMECC: Timeout to get ECC value.\n");
return -ETIMEDOUT;
}
for (i = 0; i < host->pmecc_sector_number; i++) {
for (j = 0; j < host->pmecc_bytes_per_sector; j++) {
int pos;
pos = i * host->pmecc_bytes_per_sector + j;
chip->oob_poi[eccpos[pos]] =
pmecc_readb_ecc_relaxed(host->ecc, i, j);
}
}
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
return 0;
}
static void atmel_pmecc_core_init(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
uint32_t val = 0;
struct nand_ecclayout *ecc_layout;
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
switch (host->board->pmecc_corr_cap) {
case 2:
val = PMECC_CFG_BCH_ERR2;
break;
case 4:
val = PMECC_CFG_BCH_ERR4;
break;
case 8:
val = PMECC_CFG_BCH_ERR8;
break;
case 12:
val = PMECC_CFG_BCH_ERR12;
break;
case 24:
val = PMECC_CFG_BCH_ERR24;
break;
}
if (host->board->pmecc_sector_size == 512)
val |= PMECC_CFG_SECTOR512;
else if (host->board->pmecc_sector_size == 1024)
val |= PMECC_CFG_SECTOR1024;
switch (host->pmecc_sector_number) {
case 1:
val |= PMECC_CFG_PAGE_1SECTOR;
break;
case 2:
val |= PMECC_CFG_PAGE_2SECTORS;
break;
case 4:
val |= PMECC_CFG_PAGE_4SECTORS;
break;
case 8:
val |= PMECC_CFG_PAGE_8SECTORS;
break;
}
val |= (PMECC_CFG_READ_OP | PMECC_CFG_SPARE_DISABLE
| PMECC_CFG_AUTO_DISABLE);
pmecc_writel(host->ecc, CFG, val);
ecc_layout = nand_chip->ecc.layout;
pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
pmecc_writel(host->ecc, EADDR,
ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
/* See datasheet about PMECC Clock Control Register */
pmecc_writel(host->ecc, CLK, 2);
pmecc_writel(host->ecc, IDR, 0xff);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
}
static int __init atmel_pmecc_nand_init_params(struct device_d *dev,
struct atmel_nand_host *host)
{
struct mtd_info *mtd = &host->mtd;
struct nand_chip *nand_chip = &host->nand_chip;
int cap, sector_size, err_no;
cap = host->board->pmecc_corr_cap;
sector_size = host->board->pmecc_sector_size;
dev_info(host->dev, "Initialize PMECC params, cap: %d, sector: %d\n",
cap, sector_size);
host->ecc = dev_request_mem_region(dev, 1);
if (host->ecc == NULL) {
dev_err(host->dev, "ioremap failed\n");
return -EIO;
}
host->pmerrloc_base = dev_request_mem_region(dev, 2);
host->pmecc_rom_base = dev_request_mem_region(dev, 3);
if (!host->pmerrloc_base || !host->pmecc_rom_base) {
dev_err(host->dev,
"Can not get I/O resource for PMECC ERRLOC controller or ROM!\n");
return -EIO;
}
/* ECC is calculated for the whole page (1 step) */
nand_chip->ecc.size = mtd->writesize;
/* set ECC page size and oob layout */
switch (mtd->writesize) {
case 2048:
case 4096:
case 8192:
host->pmecc_degree = (sector_size == 512) ?
PMECC_GF_DIMENSION_13 : PMECC_GF_DIMENSION_14;
host->pmecc_cw_len = (1 << host->pmecc_degree) - 1;
host->pmecc_sector_number = mtd->writesize / sector_size;
host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes(
cap, sector_size);
host->pmecc_alpha_to = pmecc_get_alpha_to(host);
host->pmecc_index_of = host->pmecc_rom_base +
host->board->pmecc_lookup_table_offset;
nand_chip->ecc.steps = 1;
nand_chip->ecc.bytes = host->pmecc_bytes_per_sector *
host->pmecc_sector_number;
if (nand_chip->ecc.bytes > mtd->oobsize - 2) {
dev_err(host->dev, "No room for ECC bytes\n");
return -EINVAL;
}
pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
mtd->oobsize,
nand_chip->ecc.bytes);
nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
break;
case 512:
case 1024:
/* TODO */
dev_warn(host->dev,
"Unsupported page size for PMECC, use Software ECC\n");
default:
/* page size not handled by HW ECC */
/* switching back to soft ECC */
nand_chip->ecc.mode = NAND_ECC_SOFT;
return 0;
}
/* Allocate data for PMECC computation */
err_no = pmecc_data_alloc(host);
if (err_no) {
dev_err(host->dev,
"Cannot allocate memory for PMECC computation!\n");
return err_no;
}
nand_chip->options |= NAND_NO_SUBPAGE_WRITE;
nand_chip->ecc.read_page = atmel_nand_pmecc_read_page;
nand_chip->ecc.write_page = atmel_nand_pmecc_write_page;
atmel_pmecc_core_init(mtd);
return 0;
}
/*
* 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;
struct atmel_nand_host *host = nand_chip->priv;
unsigned int ecc_value;
/* get the first 2 ECC bytes */
ecc_value = ecc_readl(host->ecc, PR);
ecc_code[0] = ecc_value & 0xFF;
ecc_code[1] = (ecc_value >> 8) & 0xFF;
/* get the last 2 ECC bytes */
ecc_value = ecc_readl(host->ecc, 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 oob_required, 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;
/*
* Errata: ALE is incorrectly wired up to the ECC controller
* on the AP7000, so it will include the address cycles in the
* ECC calculation.
*
* Workaround: Reset the parity registers before reading the
* actual data.
*/
#if 0
if (cpu_is_at32ap7000()) {
struct atmel_nand_host *host = chip->priv;
ecc_writel(host->ecc, CR, ATMEL_ECC_RST);
}
#endif
/* 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;
struct atmel_nand_host *host = nand_chip->priv;
unsigned int ecc_status;
unsigned int ecc_word, ecc_bit;
/* get the status from the Status Register */
ecc_status = ecc_readl(host->ecc, 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(host->ecc, PR) & ATMEL_ECC_BITADDR;
/* get word address (12 bits) */
ecc_word = ecc_readl(host->ecc, 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 */
dev_dbg(host->dev, "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.
*/
dev_dbg(host->dev, "atmel_nand : one bit error on ECC code."
" Nothing to correct\n");
return 0;
}
dev_dbg(host->dev, "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);
}
dev_dbg(host->dev, "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)
{
#if 0
if (cpu_is_at32ap7000()) {
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
ecc_writel(host->ecc, CR, ATMEL_ECC_RST);
}
#endif
}
static int atmel_hw_nand_init_params(struct device_d *dev,
struct atmel_nand_host *host)
{
struct mtd_info *mtd = &host->mtd;
struct nand_chip *nand_chip = &host->nand_chip;
host->ecc = dev_request_mem_region(dev, 1);
if (host->ecc == NULL) {
dev_err(host->dev, "ioremap failed\n");
return -EIO;
}
/* ECC is calculated for the whole page (1 step) */
nand_chip->ecc.size = mtd->writesize;
/* set ECC page size and oob layout */
switch (mtd->writesize) {
case 512:
nand_chip->ecc.layout = &atmel_oobinfo_small;
ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
break;
case 1024:
nand_chip->ecc.layout = &atmel_oobinfo_large;
ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
break;
case 2048:
nand_chip->ecc.layout = &atmel_oobinfo_large;
ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
break;
case 4096:
nand_chip->ecc.layout = &atmel_oobinfo_large;
ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
break;
default:
/* page size not handled by HW ECC */
/* switching back to soft ECC */
nand_chip->ecc.mode = NAND_ECC_SOFT;
return 0;
}
/* set up for HW ECC */
nand_chip->ecc.calculate = atmel_nand_calculate;
nand_chip->ecc.correct = atmel_nand_correct;
nand_chip->ecc.hwctl = atmel_nand_hwctl;
nand_chip->ecc.read_page = atmel_nand_read_page;
nand_chip->ecc.bytes = 4;
return 0;
}
/*
* Probe for the NAND device.
*/
static int __init atmel_nand_probe(struct device_d *dev)
{
struct atmel_nand_data *pdata = dev->platform_data;
struct atmel_nand_host *host;
struct mtd_info *mtd;
struct nand_chip *nand_chip;
int res = 0;
/* Allocate memory for the device structure (and zero it) */
host = kzalloc(sizeof(struct atmel_nand_host), GFP_KERNEL);
if (!host)
return -ENOMEM;
host->io_base = dev_request_mem_region(dev, 0);
mtd = &host->mtd;
nand_chip = &host->nand_chip;
host->board = pdata;
host->dev = dev;
nand_chip->priv = host; /* link the private data structures */
mtd->priv = nand_chip;
mtd->parent = dev;
/* Set address of NAND IO lines */
nand_chip->IO_ADDR_R = host->io_base;
nand_chip->IO_ADDR_W = host->io_base;
nand_chip->cmd_ctrl = atmel_nand_cmd_ctrl;
if (gpio_is_valid(host->board->rdy_pin)) {
res = gpio_request(host->board->rdy_pin, "nand_rdy");
if (res < 0) {
dev_err(dev, "can't request rdy gpio %d\n",
host->board->rdy_pin);
goto err_no_card;
}
res = gpio_direction_input(host->board->rdy_pin);
if (res < 0) {
dev_err(dev,
"can't request input direction rdy gpio %d\n",
host->board->rdy_pin);
goto err_no_card;
}
nand_chip->dev_ready = atmel_nand_device_ready;
}
if (gpio_is_valid(host->board->enable_pin)) {
res = gpio_request(host->board->enable_pin, "nand_enable");
if (res < 0) {
dev_err(dev,
"can't request enable gpio %d\n",
host->board->enable_pin);
goto err_no_card;
}
res = gpio_direction_output(host->board->enable_pin, 1);
if (res < 0) {
dev_err(dev,
"can't request output direction enable gpio %d\n",
host->board->enable_pin);
goto err_no_card;
}
}
nand_chip->ecc.mode = pdata->ecc_mode;
if (IS_ENABLED(CONFIG_NAND_ECC_HW) &&
pdata->ecc_mode == NAND_ECC_HW) {
nand_chip->ecc.mode = NAND_ECC_HW;
}
nand_chip->chip_delay = 40; /* 40us command delay time */
if (IS_ENABLED(CONFIG_NAND_ECC_BCH) &&
pdata->ecc_mode == NAND_ECC_SOFT_BCH) {
nand_chip->ecc.mode = NAND_ECC_SOFT_BCH;
}
if (host->board->bus_width_16) { /* 16-bit bus width */
nand_chip->options |= NAND_BUSWIDTH_16;
nand_chip->read_buf = atmel_read_buf16;
nand_chip->write_buf = atmel_write_buf16;
} else {
nand_chip->read_buf = atmel_read_buf;
nand_chip->write_buf = atmel_write_buf;
}
atmel_nand_enable(host);
if (gpio_is_valid(host->board->det_pin)) {
res = gpio_request(host->board->det_pin, "nand_det");
if (res < 0) {
dev_err(dev, "can't request det gpio %d\n",
host->board->det_pin);
goto err_no_card;
}
res = gpio_direction_input(host->board->det_pin);
if (res < 0) {
dev_err(dev,
"can't request input direction det gpio %d\n",
host->board->det_pin);
goto err_no_card;
}
if (gpio_get_value(host->board->det_pin)) {
printk("No SmartMedia card inserted.\n");
res = -ENXIO;
goto err_no_card;
}
}
if (host->board->on_flash_bbt) {
printk(KERN_INFO "atmel_nand: Use On Flash BBT\n");
nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
}
/* first scan to find the device and get the page size */
if (nand_scan_ident(mtd, 1, NULL)) {
res = -ENXIO;
goto err_scan_ident;
}
if (IS_ENABLED(CONFIG_NAND_ECC_HW) &&
nand_chip->ecc.mode == NAND_ECC_HW) {
if (IS_ENABLED(CONFIG_NAND_ATMEL_PMECC) && pdata->has_pmecc)
res = atmel_pmecc_nand_init_params(dev, host);
else
res = atmel_hw_nand_init_params(dev, host);
if (res != 0)
goto err_hw_ecc;
}
/* second phase scan */
if (nand_scan_tail(mtd)) {
res = -ENXIO;
goto err_scan_tail;
}
add_mtd_nand_device(mtd, "nand");
if (!res)
return res;
nand_release(mtd);
err_scan_tail:
err_hw_ecc:
err_scan_ident:
err_no_card:
atmel_nand_disable(host);
kfree(host);
return res;
}
static struct driver_d atmel_nand_driver = {
.name = "atmel_nand",
.probe = atmel_nand_probe,
};
device_platform_driver(atmel_nand_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Rick Bronson");
MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91 / AVR32");
