[PATCH V3] MTD: atmel_nand: Update driver to support Programmable HW ECC controller
Hong Xu
hong.xu at atmel.com
Sun Feb 5 20:32:57 EST 2012
The Programmable Hardware ECC (PMECC) controller is a programmable binary
BCH(Bose, Chaudhuri and Hocquenghem) encoder and decoder. This controller
can be used to support both SLC and MLC NAND Flash devices. It supports to
generate ECC to correct 2, 4, 8, 12 or 24 bits of error per sector of data.
To use this driver, the user needs to pass in the correction capability and
the sector size.
This driver has been tested on AT91SAM9X5-EK and AT91SAM9N12-EK with JFFS2,
YAFFS2, UBIFS and mtd-utils.
Signed-off-by: Hong Xu <hong.xu at atmel.com>
---
Changes since V1
* Per Artem's suggestion, remove the modifications in Kconfig
* Other minor changes
Changes since V2
* Per Ivan's suggestion, remove unnecessary reg access
* Per Ivan's suggestion, simplify logic to do bit reversion within byte
drivers/mtd/nand/atmel_nand.c | 970 +++++++++++++++++++++++++++++++++----
drivers/mtd/nand/atmel_nand_ecc.h | 121 +++++
2 files changed, 1005 insertions(+), 86 deletions(-)
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 35b4fb5..0103871 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -15,6 +15,8 @@
* (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c)
* (C) Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
*
+ * Add Programmable Hardware ECC support for various AT91 SoC
+ * (C) Copyright 2011 ATMEL, Hong Xu
*
* 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
@@ -38,7 +40,9 @@
#include <mach/board.h>
#include <mach/cpu.h>
-#ifdef CONFIG_MTD_NAND_ATMEL_ECC_HW
+#include "atmel_nand_ecc.h"
+
+#if defined(CONFIG_MTD_NAND_ATMEL_ECC_HW)
#define hard_ecc 1
#else
#define hard_ecc 0
@@ -56,14 +60,43 @@ module_param(use_dma, int, 0);
static int on_flash_bbt = 0;
module_param(on_flash_bbt, int, 0);
-/* Register access macros */
-#define ecc_readl(add, reg) \
- __raw_readl(add + ATMEL_ECC_##reg)
-#define ecc_writel(add, reg, value) \
- __raw_writel((value), add + ATMEL_ECC_##reg)
+struct atmel_nand_host {
+ struct nand_chip nand_chip;
+ struct mtd_info mtd;
+ void __iomem *io_base;
+ dma_addr_t io_phys;
+ struct atmel_nand_data *board;
+ struct device *dev;
+ void __iomem *ecc;
+
+ struct completion comp;
+ struct dma_chan *dma_chan;
+
+ void __iomem *pmerrloc_base;
+ void __iomem *rom_base;
+
+ int cap; /* Correcting capability */
+ int ecc_bytes_per_sector;
+ int degree; /*Degree of remainders,GF(2**degree)*/
+ int cw_len; /*Length of codeword*/
+ int sector_number;
-#include "atmel_nand_ecc.h" /* Hardware ECC registers */
+ /* lookup table for alpha_to and index_of */
+ int16_t *alpha_to;
+ int16_t *index_of;
+ int16_t partial_syn[2 * AT_NB_ERROR_MAX + 1];
+ int16_t si[2 * AT_NB_ERROR_MAX + 1];
+
+ /* Sigma table */
+ int16_t smu[AT_NB_ERROR_MAX + 2][2 * AT_NB_ERROR_MAX + 1];
+ /* polynomal order */
+ int16_t lmu[AT_NB_ERROR_MAX + 1];
+
+ uint8_t ecc_table[AT_MAX_ECC_BYTES * AT_MAX_NB_SECTOR];
+};
+
+#if defined(CONFIG_MTD_NAND_ATMEL_ECC_HW)
/* oob layout for large page size
* bad block info is on bytes 0 and 1
* the bytes have to be consecutives to avoid
@@ -90,18 +123,25 @@ static struct nand_ecclayout atmel_oobinfo_small = {
},
};
-struct atmel_nand_host {
- struct nand_chip nand_chip;
- struct mtd_info mtd;
- void __iomem *io_base;
- dma_addr_t io_phys;
- struct atmel_nand_data *board;
- struct device *dev;
- void __iomem *ecc;
+static struct nand_ecclayout atmel_pmecc_oobinfo;
- struct completion comp;
- struct dma_chan *dma_chan;
+/*
+ * Number of ECC bytes per sector is determined by both sector size
+ * and correction capability
+ *
+ * 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 const int ecc_bytes_table[5][2] = {
+ {4, 4}, {7, 7}, {13, 14}, {20, 21}, {39, 42}
};
+#endif
static int cpu_has_dma(void)
{
@@ -295,6 +335,724 @@ static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
atmel_write_buf8(mtd, buf, len);
}
+#if defined(CONFIG_MTD_NAND_ATMEL_ECC_HW)
+/*
+ * Return number of ecc bytes per sector according to sector size and
+ * correction capability
+ */
+static int pmecc_get_ecc_bytes(int cap, int sector_size)
+{
+ int i, j;
+
+ switch (cap) {
+ case 2:
+ i = 0;
+ break;
+ case 4:
+ i = 1;
+ break;
+ case 8:
+ i = 2;
+ break;
+ case 12:
+ i = 3;
+ break;
+ case 24:
+ i = 4;
+ break;
+ default:
+ BUG();
+ }
+
+ switch (sector_size) {
+ case 512:
+ j = 0;
+ break;
+ case 1024:
+ j = 1;
+ break;
+ default:
+ BUG();
+ }
+
+ return ecc_bytes_table[i][j];
+}
+
+static int cpu_has_pmecc(void)
+{
+ /* TODO: For the coming cpu_is_at91sam9x5 & cpu_is_at91sam9n12*/
+ /*
+ if (cpu_is_at91sam9x5() || cpu_is_at91sam9n12())
+ return 1;
+ else
+ */
+ return 0;
+}
+
+static int pmecc_get_clkctrl()
+{
+ /* TODO: For the coming cpu_is_at91sam9x5 & cpu_is_at91sam9n12*/
+ /*
+ if (cpu_is_at91sam9x5() || cpu_is_at91sam9n12())
+ return 2;
+ */
+ return 0;
+}
+
+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;
+
+ /* Reserve at least first 2 bytes */
+ layout->oobfree[0].offset = 2;
+ layout->oobfree[0].length = oobsize - ecc_len - 2;
+}
+
+static int16_t *pmecc_get_alpha_to(struct atmel_nand_host *host)
+{
+ int16_t *p;
+
+ if (host->board->sector_size == 512)
+ p = (int16_t *)((u32)host->rom_base +
+ AT_PMECC_LOOKUP_TABLE_OFFSET_512) +
+ AT_PMECC_LOOKUP_TABLE_SIZE_512;
+ else
+ p = (int16_t *)((u32)host->rom_base +
+ AT_PMECC_LOOKUP_TABLE_OFFSET_1024) +
+ AT_PMECC_LOOKUP_TABLE_SIZE_1024;
+ return p;
+}
+
+static int16_t *pmecc_get_index_of(struct atmel_nand_host *host)
+{
+ int16_t *p = (int16_t *)host->rom_base;
+
+ if (host->board->sector_size == 512)
+ p = (int16_t *)((u32)host->rom_base +
+ AT_PMECC_LOOKUP_TABLE_OFFSET_512);
+ else
+ p = (int16_t *)((u32)host->rom_base +
+ AT_PMECC_LOOKUP_TABLE_OFFSET_1024);
+ return p;
+}
+
+static void pmecc_gen_syndrome(struct mtd_info *mtd, int sector)
+{
+ int i;
+ uint32_t value;
+ struct nand_chip *nand_chip = mtd->priv;
+ struct atmel_nand_host *host = nand_chip->priv;
+
+ /* Fill odd syndromes */
+ for (i = 0; i < host->cap; i++) {
+ value = pmecc_readl_rem(host->ecc, sector, i / 2);
+ if (i % 2 == 0)
+ value &= 0xffff;
+ else
+ value = (value & 0xffff0000) >> 16;
+ host->partial_syn[(2 * i) + 1] = value;
+ }
+}
+
+static void pmecc_substitute(struct mtd_info *mtd)
+{
+ int16_t *si;
+ int i, j;
+ struct nand_chip *nand_chip = mtd->priv;
+ struct atmel_nand_host *host = nand_chip->priv;
+ int16_t *alpha_to = host->alpha_to;
+ int16_t *index_of = host->index_of;
+ int16_t *partial_syn = host->partial_syn;
+
+ /* si[] is a table that holds the current syndrome value,
+ * an element of that table belongs to the field
+ */
+ si = host->si;
+
+ for (i = 1; i < 2 * AT_NB_ERROR_MAX; i++)
+ si[i] = 0;
+
+ /* Computation 2t syndromes based on S(x) */
+ /* Odd syndromes */
+ for (i = 1; i <= 2 * host->cap - 1; i = i + 2) {
+ si[i] = 0;
+ for (j = 0; j < host->degree; j++) {
+ if (partial_syn[i] & ((unsigned short)0x1 << j))
+ si[i] = alpha_to[(i * j)] ^ si[i];
+ }
+ }
+ /* Even syndrome = (Odd syndrome) ** 2 */
+ for (i = 2; i <= 2 * host->cap; i = i + 2) {
+ j = i / 2;
+ if (si[j] == 0)
+ si[i] = 0;
+ else
+ si[i] = alpha_to[(2 * index_of[si[j]]) % host->cw_len];
+ }
+
+ return;
+}
+
+static void pmecc_get_sigma(struct mtd_info *mtd)
+{
+ int i, j, k;
+ struct nand_chip *nand_chip = mtd->priv;
+ struct atmel_nand_host *host = nand_chip->priv;
+
+ uint32_t dmu_0_count, tmp;
+ int16_t *lmu = host->lmu;
+ int16_t *si = host->si;
+ int16_t cap = host->cap;
+ int16_t *index_of = host->index_of;
+
+ /* mu */
+ int mu[AT_NB_ERROR_MAX + 1];
+
+ /* discrepancy */
+ int dmu[AT_NB_ERROR_MAX + 1];
+
+ /* delta order */
+ int delta[AT_NB_ERROR_MAX + 1];
+
+ /* index of largest delta */
+ int ro;
+ int largest;
+ int diff;
+
+ dmu_0_count = 0;
+
+ /* First Row */
+
+ /* Mu */
+ mu[0] = -1;
+
+ for (i = 0; i < 2 * AT_NB_ERROR_MAX + 1; i++)
+ host->smu[0][i] = 0;
+
+ host->smu[0][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 */
+ for (i = 0; i < (2 * AT_NB_ERROR_MAX + 1); i++)
+ host->smu[1][i] = 0;
+
+ host->smu[1][0] = 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 */
+ for (i = 0; i < (2 * AT_NB_ERROR_MAX + 1); i++)
+ host->smu[cap + 1][i] = 0;
+
+ 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++)
+ host->smu[cap + 1][j] = host->smu[i][j];
+
+ lmu[cap + 1] = lmu[i];
+ return;
+ }
+
+ /* copy polynom */
+ for (j = 0; j <= lmu[i] >> 1; j++)
+ host->smu[i + 1][j] = host->smu[i][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 < (2 * AT_NB_ERROR_MAX + 1); k++)
+ host->smu[i+1][k] = 0;
+
+ /* Compute smu[i+1] */
+ for (k = 0; k <= lmu[ro] >> 1; k++) {
+ if (!(host->smu[ro][k] && dmu[i]))
+ continue;
+
+ tmp = host->index_of[dmu[i]] +
+ (host->cw_len - host->index_of[dmu[ro]])
+ + host->index_of[host->smu[ro][k]];
+ host->smu[i + 1][k + diff] =
+ host->alpha_to[tmp % host->cw_len];
+ }
+
+ for (k = 0; k <= lmu[i] >> 1; k++)
+ host->smu[i + 1][k] ^= host->smu[i][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 (host->smu[i+1][k] && si[tmp + 3 - k]) {
+ tmp = index_of[host->smu[i + 1][k]] +
+ index_of[si[2 * (i - 1) + 3 - k]];
+ tmp %= host->cw_len;
+ dmu[i + 1] = host->alpha_to[tmp] ^ dmu[i + 1];
+ }
+ }
+ }
+
+ return;
+}
+
+static int pmecc_err_location(struct mtd_info *mtd)
+{
+ int i;
+ int err_nbr; /* number of error */
+ int roots_nbr; /* number of roots */
+ int sector_size;
+ uint32_t val;
+ struct nand_chip *nand_chip = mtd->priv;
+ struct atmel_nand_host *host = nand_chip->priv;
+
+ err_nbr = 0;
+ sector_size = host->board->sector_size;
+
+ pmerrloc_writel(host->pmerrloc_base, ELDIS, PMERRLOC_DISABLE);
+
+ for (i = 0; i <= host->lmu[host->cap + 1] >> 1; i++) {
+ pmerrloc_writel_sigma(host->pmerrloc_base, i,
+ host->smu[host->cap + 1][i]);
+ err_nbr++;
+ }
+
+ val = ((err_nbr - 1) << 16) | ((sector_size == 512) ? 0 : 1);
+ pmerrloc_writel(host->pmerrloc_base, ELCFG, val);
+ pmerrloc_writel(host->pmerrloc_base, ELEN,
+ sector_size * 8 + host->degree * host->cap);
+
+ while (!(pmerrloc_readl(host->pmerrloc_base, ELISR)
+ & PMERRLOC_CALC_DONE))
+ cpu_relax();
+
+ roots_nbr = (pmerrloc_readl(host->pmerrloc_base, ELISR)
+ & PMERRLOC_ERR_NUM_MASK) >> 8;
+ /* Number of roots == degree of smu hence <= cap */
+ if (roots_nbr == host->lmu[host->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,
+ int extra_bytes, int err_nbr)
+{
+ int i = 0;
+ int byte_pos, bit_pos;
+ int sector_size, ecc_size;
+ uint32_t tmp;
+ struct nand_chip *nand_chip = mtd->priv;
+ struct atmel_nand_host *host = nand_chip->priv;
+
+ sector_size = host->board->sector_size;
+ ecc_size = nand_chip->ecc.bytes;
+
+ while (err_nbr) {
+ tmp = pmerrloc_readl_el(host->pmerrloc_base, i) - 1;
+ byte_pos = tmp / 8;
+ bit_pos = tmp % 8;
+ dev_info(host->dev, "PMECC correction, byte_pos: %d "
+ "bit_pos: %d\n", byte_pos, bit_pos);
+
+ if (byte_pos < (sector_size + extra_bytes)) {
+ tmp = sector_size + pmecc_readl(host->ecc, SADDR);
+ if (byte_pos < tmp)
+ *(buf + byte_pos) ^= (1 << bit_pos);
+ else
+ *(buf + byte_pos + ecc_size) ^= (1 << bit_pos);
+ }
+
+ i++;
+ err_nbr--;
+ }
+
+ return;
+}
+
+static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf,
+ u8 *ecc)
+{
+ int i, err_nbr;
+ uint8_t *buf_pos;
+ int eccbytes;
+ struct nand_chip *nand_chip = mtd->priv;
+ struct atmel_nand_host *host = nand_chip->priv;
+
+ 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->sector_number; i++) {
+ err_nbr = 0;
+ if (pmecc_stat & 0x1) {
+ buf_pos = buf + i * host->board->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 -EFAULT;
+ } else {
+ pmecc_correct_data(mtd, buf_pos, 0, 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, int32_t page)
+{
+ uint32_t stat;
+ int eccsize = chip->ecc.size;
+ uint8_t *oob = chip->oob_poi;
+ struct atmel_nand_host *host = chip->priv;
+ uint32_t *eccpos = chip->ecc.layout->eccpos;
+
+ pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
+ pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
+ pmecc_writel(host->ecc, CFG, (pmecc_readl(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);
+
+ while ((pmecc_readl(host->ecc, SR) & PMECC_SR_BUSY))
+ cpu_relax();
+
+ stat = pmecc_readl(host->ecc, ISR);
+ if (stat != 0) {
+ if (pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]) != 0)
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void atmel_nand_pmecc_write_page(struct mtd_info *mtd,
+ struct nand_chip *chip, const uint8_t *buf)
+{
+ int i, j;
+ struct atmel_nand_host *host = chip->priv;
+ uint32_t *eccpos = chip->ecc.layout->eccpos;
+
+ pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
+ pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
+
+ pmecc_writel(host->ecc, CFG, (pmecc_readl(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);
+
+ while ((pmecc_readl(host->ecc, SR) & PMECC_SR_BUSY))
+ cpu_relax();
+
+ for (i = 0; i < host->sector_number; i++) {
+ for (j = 0; j < host->ecc_bytes_per_sector; j++) {
+ int pos;
+
+ pos = i * host->ecc_bytes_per_sector + j;
+ chip->oob_poi[eccpos[pos]] =
+ pmecc_readb_ecc(host->ecc, i, j);
+ }
+ }
+ chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
+
+ return;
+}
+
+static void atmel_pmecc_core_init(struct mtd_info *mtd)
+{
+ uint32_t val = 0;
+ struct nand_chip *nand_chip = mtd->priv;
+ struct atmel_nand_host *host = nand_chip->priv;
+ struct nand_ecclayout *ecc_layout;
+
+ pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
+ pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
+
+ switch (host->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->sector_size == 512)
+ val |= PMECC_CFG_SECTOR512;
+ else if (host->board->sector_size == 1024)
+ val |= PMECC_CFG_SECTOR1024;
+
+ switch (host->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]);
+ pmecc_writel(host->ecc, CLK, pmecc_get_clkctrl());
+ pmecc_writel(host->ecc, IDR, 0xff);
+ pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
+}
+
+static int __init atmel_pmecc_init_params(struct platform_device *pdev,
+ struct atmel_nand_host *host)
+{
+ int cap, sector_size, err_no;
+ struct mtd_info *mtd;
+ struct nand_chip *nand_chip;
+ struct resource *regs;
+ struct resource *regs_pmerr, *regs_rom;
+
+ cap = host->board->correction_cap;
+ sector_size = host->board->sector_size;
+ dev_info(host->dev, "Initialize PMECC params, cap: %d, sector: %d\n",
+ cap, sector_size);
+
+ /* Sanity check */
+ if ((sector_size != 512) && (sector_size != 1024)) {
+ dev_err(host->dev, "Unsupported PMECC sector size: %d;"
+ " Valid sector size is 512 or 1024 bytes\n",
+ host->board->sector_size);
+ return -EINVAL;
+ }
+ if ((cap != 2) && (cap != 4) && (cap != 8) && (cap != 12) &&
+ (cap != 24)) {
+ dev_err(host->dev, "Unsupported PMECC correction capability,"
+ " Valid one is either 2, 4, 8, 12 or 24\n");
+ return -EINVAL;
+ }
+
+ nand_chip = &host->nand_chip;
+ mtd = &host->mtd;
+
+ nand_chip->ecc.mode = NAND_ECC_SOFT; /* By default */
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (hard_ecc && !regs) {
+ dev_warn(host->dev, "Can't get I/O resource regs\nFalling "
+ "back on software ECC\n");
+ return 0;
+ }
+
+ if (no_ecc)
+ nand_chip->ecc.mode = NAND_ECC_NONE;
+ if (hard_ecc && regs) {
+ host->ecc = ioremap(regs->start, resource_size(regs));
+ if (host->ecc == NULL) {
+ dev_err(host->dev, "ioremap failed\n");
+ err_no = -EIO;
+ goto err_pmecc_ioremap;
+ }
+
+ regs_pmerr = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ regs_rom = platform_get_resource(pdev, IORESOURCE_MEM, 3);
+ if (regs_pmerr && regs_rom) {
+ host->pmerrloc_base = ioremap(regs_pmerr->start,
+ resource_size(regs_pmerr));
+ host->rom_base = ioremap(regs_rom->start,
+ resource_size(regs_rom));
+
+ if (host->pmerrloc_base && host->rom_base) {
+ nand_chip->ecc.mode = NAND_ECC_HW;
+ nand_chip->ecc.read_page =
+ atmel_nand_pmecc_read_page;
+ nand_chip->ecc.write_page =
+ atmel_nand_pmecc_write_page;
+ } else {
+ dev_err(host->dev, "Can not get I/O resource"
+ " for HW PMECC controller!\n");
+ err_no = -EIO;
+ goto err_pmloc_ioremap;
+ }
+ }
+
+ if (nand_chip->ecc.mode != NAND_ECC_HW) {
+ dev_err(host->dev, "Can not get I/O resource"
+ " for HW ECC Rolling back to software ECC\n");
+ err_no = 0;
+ goto err_pmloc_ioremap;
+ }
+ }
+
+ if (nand_chip->ecc.mode == NAND_ECC_HW) {
+ /* 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:
+ host->degree = GF_DIMENSION_13;
+ host->cw_len = (1 << host->degree) - 1;
+ host->cap = cap;
+ host->sector_number = mtd->writesize / sector_size;
+ host->ecc_bytes_per_sector = pmecc_get_ecc_bytes(
+ host->cap, sector_size);
+ host->alpha_to = pmecc_get_alpha_to(host);
+ host->index_of = pmecc_get_index_of(host);
+
+ nand_chip->ecc.steps = 1;
+ nand_chip->ecc.bytes = host->ecc_bytes_per_sector *
+ host->sector_number;
+ if (nand_chip->ecc.bytes > mtd->oobsize - 2) {
+ dev_err(host->dev, "No room for ECC bytes\n");
+ err_no = -EINVAL;
+ goto err;
+ }
+ nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
+ pmecc_config_ecc_layout(nand_chip->ecc.layout,
+ mtd->oobsize,
+ nand_chip->ecc.bytes);
+ break;
+ case 512:
+ case 1024:
+ case 4096:
+ /* TODO */
+ dev_warn(host->dev, "Only 2048 page size is currently"
+ "supported for PMECC, back to Software ECC\n");
+ default:
+ /* page size not handled by HW ECC */
+ /* switching back to soft ECC */
+ nand_chip->ecc.mode = NAND_ECC_SOFT;
+ nand_chip->ecc.calculate = NULL;
+ nand_chip->ecc.correct = NULL;
+ nand_chip->ecc.hwctl = NULL;
+ nand_chip->ecc.read_page = NULL;
+ nand_chip->ecc.write_page = NULL;
+ nand_chip->ecc.postpad = 0;
+ nand_chip->ecc.prepad = 0;
+ nand_chip->ecc.bytes = 0;
+ err_no = 0;
+ goto err;
+ }
+ }
+
+ /* Initialize PMECC core if applicable */
+ if (nand_chip->ecc.mode == NAND_ECC_HW)
+ atmel_pmecc_core_init(mtd);
+
+ return 0;
+
+err:
+err_pmloc_ioremap:
+ iounmap(host->ecc);
+ if (host->pmerrloc_base)
+ iounmap(host->pmerrloc_base);
+ if (host->rom_base)
+ iounmap(host->rom_base);
+err_pmecc_ioremap:
+ return err_no;
+}
+
/*
* Calculate HW ECC
*
@@ -481,6 +1239,84 @@ static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
}
}
+static int __init atmel_nand_init_params(struct platform_device *pdev,
+ struct atmel_nand_host *host)
+{
+ struct resource *regs;
+ struct mtd_info *mtd;
+ struct nand_chip *nand_chip;
+
+ nand_chip = &host->nand_chip;
+ mtd = &host->mtd;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!regs && hard_ecc) {
+ dev_err(host->dev, "Can't get I/O resource "
+ "regs\nFalling back on software ECC\n");
+ }
+
+ nand_chip->ecc.mode = NAND_ECC_SOFT; /* enable ECC */
+ if (no_ecc)
+ nand_chip->ecc.mode = NAND_ECC_NONE;
+ if (hard_ecc && regs) {
+ host->ecc = ioremap(regs->start, resource_size(regs));
+ if (host->ecc == NULL) {
+ printk(KERN_ERR "atmel_nand: ioremap failed\n");
+ goto err_ecc_ioremap;
+ }
+
+ nand_chip->ecc.mode = NAND_ECC_HW;
+ 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;
+ }
+
+ if (nand_chip->ecc.mode == NAND_ECC_HW) {
+ /* 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;
+ nand_chip->ecc.calculate = NULL;
+ nand_chip->ecc.correct = NULL;
+ nand_chip->ecc.hwctl = NULL;
+ nand_chip->ecc.read_page = NULL;
+ nand_chip->ecc.postpad = 0;
+ nand_chip->ecc.prepad = 0;
+ nand_chip->ecc.bytes = 0;
+ break;
+ }
+ }
+
+ return 0;
+
+err_ecc_ioremap:
+ return -EIO;
+}
+#endif
+
/*
* Probe for the NAND device.
*/
@@ -489,9 +1325,8 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
struct atmel_nand_host *host;
struct mtd_info *mtd;
struct nand_chip *nand_chip;
- struct resource *regs;
struct resource *mem;
- int res;
+ int ret = 0;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
@@ -511,7 +1346,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
host->io_base = ioremap(mem->start, resource_size(mem));
if (host->io_base == NULL) {
printk(KERN_ERR "atmel_nand: ioremap failed\n");
- res = -EIO;
+ ret = -EIO;
goto err_nand_ioremap;
}
@@ -532,29 +1367,9 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
if (gpio_is_valid(host->board->rdy_pin))
nand_chip->dev_ready = atmel_nand_device_ready;
- regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- if (!regs && hard_ecc) {
- printk(KERN_ERR "atmel_nand: can't get I/O resource "
- "regs\nFalling back on software ECC\n");
- }
-
nand_chip->ecc.mode = NAND_ECC_SOFT; /* enable ECC */
if (no_ecc)
nand_chip->ecc.mode = NAND_ECC_NONE;
- if (hard_ecc && regs) {
- host->ecc = ioremap(regs->start, resource_size(regs));
- if (host->ecc == NULL) {
- printk(KERN_ERR "atmel_nand: ioremap failed\n");
- res = -EIO;
- goto err_ecc_ioremap;
- }
- nand_chip->ecc.mode = NAND_ECC_HW;
- 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;
- }
nand_chip->chip_delay = 20; /* 20us command delay time */
@@ -570,7 +1385,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
if (gpio_is_valid(host->board->det_pin)) {
if (gpio_get_value(host->board->det_pin)) {
printk(KERN_INFO "No SmartMedia card inserted.\n");
- res = -ENXIO;
+ ret = -ENXIO;
goto err_no_card;
}
}
@@ -602,59 +1417,32 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
/* first scan to find the device and get the page size */
if (nand_scan_ident(mtd, 1, NULL)) {
- res = -ENXIO;
+ ret = -ENXIO;
goto err_scan_ident;
}
- if (nand_chip->ecc.mode == NAND_ECC_HW) {
- /* 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;
- nand_chip->ecc.calculate = NULL;
- nand_chip->ecc.correct = NULL;
- nand_chip->ecc.hwctl = NULL;
- nand_chip->ecc.read_page = NULL;
- nand_chip->ecc.postpad = 0;
- nand_chip->ecc.prepad = 0;
- nand_chip->ecc.bytes = 0;
- break;
- }
- }
+#if defined(CONFIG_MTD_NAND_ATMEL_ECC_HW)
+ if (!cpu_has_pmecc())
+ ret = atmel_nand_init_params(pdev, host);
+ else
+ ret = atmel_pmecc_init_params(pdev, host);
+ if (ret != 0)
+ goto err;
+#endif
/* second phase scan */
if (nand_scan_tail(mtd)) {
- res = -ENXIO;
+ ret = -ENXIO;
goto err_scan_tail;
}
mtd->name = "atmel_nand";
- res = mtd_device_parse_register(mtd, NULL, 0,
+ ret = mtd_device_parse_register(mtd, NULL, 0,
host->board->parts, host->board->num_parts);
- if (!res)
- return res;
+ if (!ret)
+ return ret;
+err:
err_scan_tail:
err_scan_ident:
err_no_card:
@@ -662,13 +1450,10 @@ err_no_card:
platform_set_drvdata(pdev, NULL);
if (host->dma_chan)
dma_release_channel(host->dma_chan);
- if (host->ecc)
- iounmap(host->ecc);
-err_ecc_ioremap:
iounmap(host->io_base);
err_nand_ioremap:
kfree(host);
- return res;
+ return ret;
}
/*
@@ -683,8 +1468,21 @@ static int __exit atmel_nand_remove(struct platform_device *pdev)
atmel_nand_disable(host);
+#if defined(CONFIG_MTD_NAND_ATMEL_ECC_HW)
+ if (cpu_has_pmecc()) {
+ pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
+ if (host->pmerrloc_base) {
+ pmerrloc_writel(host->pmerrloc_base, ELDIS,
+ PMERRLOC_DISABLE);
+ iounmap(host->pmerrloc_base);
+ }
+ if (host->rom_base)
+ iounmap(host->rom_base);
+ }
+
if (host->ecc)
iounmap(host->ecc);
+#endif
if (host->dma_chan)
dma_release_channel(host->dma_chan);
diff --git a/drivers/mtd/nand/atmel_nand_ecc.h b/drivers/mtd/nand/atmel_nand_ecc.h
index 578c776..f574b26 100644
--- a/drivers/mtd/nand/atmel_nand_ecc.h
+++ b/drivers/mtd/nand/atmel_nand_ecc.h
@@ -36,4 +36,125 @@
#define ATMEL_ECC_NPR 0x10 /* NParity register */
#define ATMEL_ECC_NPARITY (0xffff << 0) /* NParity */
+/* Register access macros */
+#define ecc_readl(add, reg) \
+ __raw_readl(add + ATMEL_ECC_##reg)
+#define ecc_writel(add, reg, value) \
+ __raw_writel((value), add + ATMEL_ECC_##reg)
+
+/* PMECC Register Definitions */
+#define ATMEL_PMECC_CFG 0x000 /* Configuration Register */
+#define PMECC_CFG_BCH_ERR2 (0 << 0)
+#define PMECC_CFG_BCH_ERR4 (1 << 0)
+#define PMECC_CFG_BCH_ERR8 (2 << 0)
+#define PMECC_CFG_BCH_ERR12 (3 << 0)
+#define PMECC_CFG_BCH_ERR24 (4 << 0)
+
+#define PMECC_CFG_SECTOR512 (0 << 4)
+#define PMECC_CFG_SECTOR1024 (1 << 4)
+
+#define PMECC_CFG_PAGE_1SECTOR (0 << 8)
+#define PMECC_CFG_PAGE_2SECTORS (1 << 8)
+#define PMECC_CFG_PAGE_4SECTORS (2 << 8)
+#define PMECC_CFG_PAGE_8SECTORS (3 << 8)
+
+#define PMECC_CFG_READ_OP (0 << 12)
+#define PMECC_CFG_WRITE_OP (1 << 12)
+
+#define PMECC_CFG_SPARE_ENABLE (1 << 16)
+#define PMECC_CFG_SPARE_DISABLE (0 << 16)
+
+#define PMECC_CFG_AUTO_ENABLE (1 << 20)
+#define PMECC_CFG_AUTO_DISABLE (0 << 20)
+
+#define ATMEL_PMECC_SAREA 0x004 /* Spare area size */
+#define ATMEL_PMECC_SADDR 0x008 /* PMECC starting address */
+#define ATMEL_PMECC_EADDR 0x00c /* PMECC ending address */
+#define ATMEL_PMECC_CLK 0x010 /* PMECC clock control */
+#define PMECC_CLK_133MHZ (2 << 0)
+
+#define ATMEL_PMECC_CTRL 0x014 /* PMECC control register */
+#define PMECC_CTRL_RST (1 << 0)
+#define PMECC_CTRL_DATA (1 << 1)
+#define PMECC_CTRL_USER (1 << 2)
+#define PMECC_CTRL_ENABLE (1 << 4)
+#define PMECC_CTRL_DISABLE (1 << 5)
+
+#define ATMEL_PMECC_SR 0x018 /* PMECC status register */
+#define PMECC_SR_BUSY (1 << 0)
+#define PMECC_SR_ENABLE (1 << 4)
+
+#define ATMEL_PMECC_IER 0x01c /* PMECC interrupt enable */
+#define PMECC_IER_ENABLE (1 << 0)
+#define ATMEL_PMECC_IDR 0x020 /* PMECC interrupt disable */
+#define PMECC_IER_DISABLE (1 << 0)
+#define ATMEL_PMECC_IMR 0x024 /* PMECC interrupt mask */
+#define PMECC_IER_MASK (1 << 0)
+#define ATMEL_PMECC_ISR 0x028 /* PMECC interrupt status */
+#define ATMEL_PMECC_ECCx 0x040 /* PMECC ECC x */
+#define ATMEL_PMECC_REMx 0x240 /* PMECC REM x */
+
+/* PMERRLOC Register Definitions */
+#define ATMEL_PMERRLOC_ELCFG 0x000 /* Error location config */
+#define PMERRLOC_ELCFG_SECTOR_512 (0 << 0)
+#define PMERRLOC_ELCFG_SECTOR_1024 (1 << 0)
+#define PMERRLOC_ELCFG_NUM_ERRORS(n) ((n) << 16)
+
+#define ATMEL_PMERRLOC_ELPRIM 0x004 /* Error location primitive */
+#define ATMEL_PMERRLOC_ELEN 0x008 /* Error location enable */
+#define ATMEL_PMERRLOC_ELDIS 0x00c /* Error location disable */
+#define PMERRLOC_DISABLE (1 << 0)
+
+#define ATMEL_PMERRLOC_ELSR 0x010 /* Error location status */
+#define PMERRLOC_ELSR_BUSY (1 << 0)
+#define ATMEL_PMERRLOC_ELIER 0x014 /* Error location int enable */
+#define ATMEL_PMERRLOC_ELIDR 0x018 /* Error location int disable */
+#define ATMEL_PMERRLOC_ELIMR 0x01c /* Error location int mask */
+#define ATMEL_PMERRLOC_ELISR 0x020 /* Error location int status */
+#define PMERRLOC_ERR_NUM_MASK (0x1f << 8)
+#define PMERRLOC_CALC_DONE (1 << 0)
+#define ATMEL_PMERRLOC_SIGMAx 0x028 /* Error location SIGMA x */
+#define ATMEL_PMERRLOC_ELx 0x08c /* Error location x */
+
+/* Register access macros for PMECC */
+#define pmecc_readl(addr, reg) \
+ __raw_readl((addr) + ATMEL_PMECC_##reg)
+
+#define pmecc_writel(addr, reg, value) \
+ __raw_writel((value), (addr) + ATMEL_PMECC_##reg)
+
+#define pmecc_readb_ecc(addr, sector, n) \
+ __raw_readb((addr) + ATMEL_PMECC_ECCx + ((sector) * 0x40) + (n))
+
+#define pmecc_readl_rem(addr, sector, n) \
+ __raw_readl((addr) + ATMEL_PMECC_REMx + ((sector) * 0x40) + ((n) * 4))
+
+#define pmerrloc_readl(addr, reg) \
+ __raw_readl((addr) + ATMEL_PMERRLOC_##reg)
+
+#define pmerrloc_writel(addr, reg, value) \
+ __raw_writel((value), (addr) + ATMEL_PMERRLOC_##reg)
+
+#define pmerrloc_writel_sigma(addr, n, value) \
+ __raw_writel((value), (addr) + ATMEL_PMERRLOC_SIGMAx + ((n) * 4))
+
+#define pmerrloc_readl_sigma(addr, n) \
+ __raw_readl((addr) + ATMEL_PMERRLOC_SIGMAx + ((n) * 4))
+
+#define pmerrloc_readl_el(addr, n) \
+ __raw_readl((addr) + ATMEL_PMERRLOC_ELx + ((n) * 4))
+
+/* Galois field dimension */
+#define GF_DIMENSION_13 13
+#define GF_DIMENSION_14 14
+
+#define AT_NB_ERROR_MAX 25
+#define AT_MAX_ECC_BYTES 42
+#define AT_MAX_NB_SECTOR 8
+
+#define AT_PMECC_LOOKUP_TABLE_OFFSET_512 0x8000
+#define AT_PMECC_LOOKUP_TABLE_SIZE_512 0x2000
+#define AT_PMECC_LOOKUP_TABLE_OFFSET_1024 0x10000
+#define AT_PMECC_LOOKUP_TABLE_SIZE_1024 0x4000
+
#endif
--
1.7.3.3
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