| Message ID | 1338038677-6752-4-git-send-email-josh.wu@atmel.com |
|---|---|
| State | New, archived |
| Headers | show |
On Sat, 2012-05-26 at 21:24 +0800, Josh Wu wrote: > + while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) { > + if (unlikely(timeout_count++ > PMECC_MAX_TIMEOUT_COUNT)) { > + dev_err(host->dev, "PMECC: Timeout to get ECC value.\n"); > + return; /* Time out */ How this error is communicated then up the the user? > + } > + cpu_relax(); > + } I see this pattern all over the place - why people consider it reliable? Is this code guaranteed to run on the same CPU? Why not to use loops_per_jiffie * msecs_to_jiffies(TIMOUT) instead to calculate how many iterations to do? Yes, due to HW register reading and cpu_relax() the real timeout will be larger, but this is about error anyway, so it does not hurt to iterate longer?
On 21:24 Sat 26 May , Josh Wu wrote: > The Programmable Multibit 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@atmel.com> > Signed-off-by: Josh Wu <josh.wu@atmel.com> > --- > drivers/mtd/nand/atmel_nand.c | 761 ++++++++++++++++++++++++++++++++++++- > drivers/mtd/nand/atmel_nand_ecc.h | 116 ++++++ > 2 files changed, 876 insertions(+), 1 deletion(-) > > diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c > index 9a9bfbf..ddcf1ed 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 Multibit ECC support for various AT91 SoC > + * (C) Copyright 2012 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 > @@ -77,6 +79,21 @@ static struct nand_ecclayout atmel_oobinfo_small = { > }, > }; > > +/* a structure includes datas for PMECC computation */ > +struct atmel_pmecc_data { > + int16_t partial_syn[2 * PMECC_MAX_ERROR_NB + 1]; > + int16_t si[2 * PMECC_MAX_ERROR_NB + 1]; > + > + /* Sigma table */ > + int16_t smu[PMECC_MAX_ERROR_NB + 2][2 * PMECC_MAX_ERROR_NB + 1]; you still hardcode the array in the struct and if the pmecc evolve we will have to touch again please allocate them > + /* polynomal order */ > + int16_t lmu[PMECC_MAX_ERROR_NB + 1]; > + > + int mu[PMECC_MAX_ERROR_NB + 1]; > + int dmu[PMECC_MAX_ERROR_NB + 1]; > + int delta[PMECC_MAX_ERROR_NB + 1]; > +}; > + > struct atmel_nand_host { > struct nand_chip nand_chip; > struct mtd_info mtd; > @@ -92,8 +109,25 @@ struct atmel_nand_host { > bool has_pmecc; > u8 pmecc_corr_cap; > u16 pmecc_sector_size; > + > + 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 */ > + struct atmel_pmecc_data *pmecc_data; > }; > > +static struct nand_ecclayout atmel_pmecc_oobinfo; > + > static int cpu_has_dma(void) > { > return cpu_is_at91sam9rl() || cpu_is_at91sam9g45(); > @@ -287,6 +321,708 @@ static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len) > } > > /* > + * 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) > +{ > + void __iomem *p; > + > + switch (host->pmecc_sector_size) { > + case 512: > + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_512 + > + PMECC_LOOKUP_TABLE_SIZE_512 * sizeof(int16_t); > + break; > + case 1024: > + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_1024 + > + PMECC_LOOKUP_TABLE_SIZE_1024 * sizeof(int16_t); > + break; > + default: > + BUG(); > + } > + > + return p; > +} > + > +static void __iomem *pmecc_get_index_of(struct atmel_nand_host *host) this is a __dev_init function plese check the other too btw you need to use __dev_init and not __init > +{ > + void __iomem *p; > + > + switch (host->pmecc_sector_size) { > + case 512: > + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_512; > + break; > + case 1024: > + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_1024; > + break; > + default: > + BUG(); > + } > + > + 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->pmecc_corr_cap; i++) { > + value = pmecc_readl_rem_relaxed(host->ecc, sector, i / 2); > + value = (i & 1) ? (value & 0xffff0000) >> 16 : value & 0xffff; simplify by if (i & 1) val >>= 16; value &= 0xffff; > + host->pmecc_data->partial_syn[(2 * i) + 1] = (int16_t)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 __iomem *alpha_to = host->pmecc_alpha_to; > + int16_t __iomem *index_of = host->pmecc_index_of; > + int16_t *partial_syn = host->pmecc_data->partial_syn; > + > + /* si[] is a table that holds the current syndrome value, > + * an element of that table belongs to the field > + */ > + si = host->pmecc_data->si; > + > + for (i = 1; i < 2 * PMECC_MAX_ERROR_NB; i++) > + si[i] = 0; please use memset > + > + /* Computation 2t syndromes based on S(x) */ > + /* Odd syndromes */ > + for (i = 1; i < 2 * host->pmecc_corr_cap; i += 2) { > + si[i] = 0; shy this you already init the array at 0 before > + for (j = 0; j < host->pmecc_degree; j++) { > + if (partial_syn[i] & ((unsigned short)0x1 << j)) > + si[i] = readw_relaxed(alpha_to + i * j) ^ si[i]; > + } > + } > + /* Even syndrome = (Odd syndrome) ** 2 */ > + for (i = 2; i <= 2 * host->pmecc_corr_cap; i += 2) { > + j = i / 2; > + if (si[j] == 0) here if { } else { } > + si[i] = 0; > + else { > + int16_t tmp; missing blank line > + tmp = readw_relaxed(index_of + si[j]); > + tmp = (tmp * 2) % host->pmecc_cw_len; > + si[i] = readw_relaxed(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; > + > + int i, j, k; > + uint32_t dmu_0_count, tmp; > + int16_t (*smu)[2 * PMECC_MAX_ERROR_NB + 1]; > + int16_t *lmu = host->pmecc_data->lmu; > + int16_t *si = host->pmecc_data->si; > + int *mu = host->pmecc_data->mu; > + int *dmu = host->pmecc_data->dmu; /* Discrepancy */ > + int *delta = host->pmecc_data->delta; /* Delta order */ > + int cw_len = host->pmecc_cw_len; > + int16_t cap = host->pmecc_corr_cap; > + > + int16_t __iomem *index_of = host->pmecc_index_of; > + int16_t __iomem *alpha_to = host->pmecc_alpha_to; > + > + /* index of largest delta */ > + int ro; > + int largest; > + int diff; > + > + dmu_0_count = 0; > + smu = host->pmecc_data->smu; > + > + /* First Row */ > + > + /* Mu */ > + mu[0] = -1; > + > + memset(&smu[0][0], 0, > + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); > + 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 */ > + memset(&smu[1][0], 0, > + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); > + 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 */ > + memset(&smu[cap + 1][0], 0, > + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); > + > + 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][j] = smu[i][j]; > + lmu[cap + 1] = lmu[i]; > + return; > + } > + > + /* copy polynom */ > + for (j = 0; j <= lmu[i] >> 1; j++) > + smu[i + 1][j] = 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 * PMECC_MAX_ERROR_NB + 1); k++) > + smu[i+1][k] = 0; > + > + /* Compute smu[i+1] */ > + for (k = 0; k <= lmu[ro] >> 1; k++) { > + int16_t a, b, c; > + > + if (!(smu[ro][k] && dmu[i])) > + continue; > + a = readw_relaxed(index_of + dmu[i]); > + b = readw_relaxed(index_of + dmu[ro]); > + c = readw_relaxed(index_of + smu[ro][k]); > + tmp = a + (cw_len - b) + c; > + a = readw_relaxed(alpha_to + tmp % cw_len); > + smu[i + 1][k + diff] = a; > + } > + > + for (k = 0; k <= lmu[i] >> 1; k++) > + smu[i + 1][k] ^= 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 (smu[i+1][k] && si[tmp + 3 - k]) { > + int16_t a, b, c; > + a = readw_relaxed(index_of + smu[i + 1][k]); > + b = si[2 * (i - 1) + 3 - k]; > + c = readw_relaxed(index_of + b); > + tmp = a + c; > + tmp %= cw_len; > + dmu[i + 1] = readw_relaxed(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; > + int timeout_count = 0; > + int cap = host->pmecc_corr_cap; > + > + err_nbr = 0; > + sector_size = host->pmecc_sector_size; > + > + pmerrloc_writel(host->pmerrloc_base, ELDIS, PMERRLOC_DISABLE); > + > + for (i = 0; i <= host->pmecc_data->lmu[cap + 1] >> 1; i++) { > + pmerrloc_writel_sigma_relaxed(host->pmerrloc_base, i, > + host->pmecc_data->smu[cap + 1][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); > + > + while (!(pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR) > + & PMERRLOC_CALC_DONE)) { > + if (unlikely(timeout_count++ > PMECC_MAX_TIMEOUT_COUNT)) > + return -1; /* Time out */ > + cpu_relax(); > + } > + > + 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_data->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, > + 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->pmecc_sector_size; > + ecc_size = nand_chip->ecc.bytes; > + > + while (err_nbr) { > + tmp = pmerrloc_readl_el_relaxed(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_relaxed(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->pmecc_sector_number; i++) { > + err_nbr = 0; > + if (pmecc_stat & 0x1) { > + buf_pos = buf + i * host->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, 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, int page) > +{ > + uint32_t stat; > + int timeout_count = 0; > + 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_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); > + > + while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) { > + if (unlikely(timeout_count++ > PMECC_MAX_TIMEOUT_COUNT)) > + return -EIO; /* Time out */ > + cpu_relax(); > + } > + > + 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 void atmel_nand_pmecc_write_page(struct mtd_info *mtd, > + struct nand_chip *chip, const uint8_t *buf) > +{ > + int i, j; > + int timeout_count = 0; > + 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_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); > + > + while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) { > + if (unlikely(timeout_count++ > PMECC_MAX_TIMEOUT_COUNT)) { > + dev_err(host->dev, "PMECC: Timeout to get ECC value.\n"); > + return; /* Time out */ > + } > + cpu_relax(); > + } > + > + 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; > +} > + > +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->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->pmecc_sector_size == 512) > + val |= PMECC_CFG_SECTOR512; > + else if (host->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 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->pmecc_corr_cap; > + sector_size = host->pmecc_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; should be 512 or 1024 bytes\n", > + sector_size); > + return -EINVAL; > + } > + if ((cap != 2) && (cap != 4) && (cap != 8) && (cap != 12) && > + (cap != 24)) { > + dev_err(host->dev, > + "Unsupported PMECC correction capability, should be 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 (!regs) { > + dev_warn(host->dev, > + "Can't get I/O resource regs, rolling back on software ECC\n"); > + return 0; > + } > + > + 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->pmecc_rom_base = ioremap(regs_rom->start, > + resource_size(regs_rom)); > + > + if (host->pmerrloc_base && host->pmecc_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 PMECC controller!\n"); > + err_no = -EIO; > + goto err_pmloc_ioremap; > + } > + } > + > + /* 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->pmecc_degree = PMECC_GF_DIMENSION_13; > + host->pmecc_cw_len = (1 << host->pmecc_degree) - 1; > + host->pmecc_corr_cap = cap; > + 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 = pmecc_get_index_of(host); > + > + nand_chip->ecc.steps = 1; > + nand_chip->ecc.strength = cap; > + 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"); > + err_no = -EINVAL; > + goto err; > + } > + 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: > + case 4096: > + /* 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; > + 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; > + } > + > + /* Allocate data for PMECC computation */ > + host->pmecc_data = kzalloc(sizeof(struct atmel_pmecc_data), GFP_KERNEL); why do you always allocate the pmecc_data? you need to allocate it only if you use it Best Regards, J. > + if (!host->pmecc_data) { > + dev_err(host->dev, > + "Cannot allocate memory for PMECC computation!\n"); > + err_no = -ENOMEM; > + goto err; > + } > + > + atmel_pmecc_core_init(mtd); > + > + return 0; > + > +err: > +err_pmloc_ioremap: > + iounmap(host->ecc); > + if (host->pmerrloc_base) > + iounmap(host->pmerrloc_base); > + if (host->pmecc_rom_base) > + iounmap(host->pmecc_rom_base); > +err_pmecc_ioremap: > + return err_no; > +} > + > +/* > * Calculate HW ECC > * > * function called after a write > @@ -720,7 +1456,11 @@ static int __init atmel_nand_probe(struct platform_device *pdev) > } > > if (nand_chip->ecc.mode == NAND_ECC_HW) { > - res = atmel_hw_nand_init_params(pdev, host); > + if (host->has_pmecc) > + res = atmel_pmecc_nand_init_params(pdev, host); > + else > + res = atmel_hw_nand_init_params(pdev, host); > + > if (res != 0) > goto err_hw_ecc; > } > @@ -741,6 +1481,12 @@ static int __init atmel_nand_probe(struct platform_device *pdev) > err_scan_tail: > if (host->ecc) > iounmap(host->ecc); > + if (host->has_pmecc) { no need to check if you have teh pmecc if it's no the case pmerrloc_base will be NULLo don't you need to disable it in the error path? Best Regards, J.
On 5/28/2012 2:58 PM, Jean-Christophe PLAGNIOL-VILLARD wrote: > On 21:24 Sat 26 May , Josh Wu wrote: >> The Programmable Multibit 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@atmel.com> >> Signed-off-by: Josh Wu<josh.wu@atmel.com> >> --- >> drivers/mtd/nand/atmel_nand.c | 761 ++++++++++++++++++++++++++++++++++++- >> drivers/mtd/nand/atmel_nand_ecc.h | 116 ++++++ >> 2 files changed, 876 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c >> index 9a9bfbf..ddcf1ed 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 Multibit ECC support for various AT91 SoC >> + * (C) Copyright 2012 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 >> @@ -77,6 +79,21 @@ static struct nand_ecclayout atmel_oobinfo_small = { >> }, >> }; >> >> +/* a structure includes datas for PMECC computation */ >> +struct atmel_pmecc_data { >> + int16_t partial_syn[2 * PMECC_MAX_ERROR_NB + 1]; >> + int16_t si[2 * PMECC_MAX_ERROR_NB + 1]; >> + >> + /* Sigma table */ >> + int16_t smu[PMECC_MAX_ERROR_NB + 2][2 * PMECC_MAX_ERROR_NB + 1]; > you still hardcode the array in the struct > > and if the pmecc evolve we will have to touch again > please allocate them ok. >> + /* polynomal order */ >> + int16_t lmu[PMECC_MAX_ERROR_NB + 1]; >> + >> + int mu[PMECC_MAX_ERROR_NB + 1]; >> + int dmu[PMECC_MAX_ERROR_NB + 1]; >> + int delta[PMECC_MAX_ERROR_NB + 1]; >> +}; >> + >> struct atmel_nand_host { >> struct nand_chip nand_chip; >> struct mtd_info mtd; >> @@ -92,8 +109,25 @@ struct atmel_nand_host { >> bool has_pmecc; >> u8 pmecc_corr_cap; >> u16 pmecc_sector_size; >> + >> + 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 */ >> + struct atmel_pmecc_data *pmecc_data; >> }; >> >> +static struct nand_ecclayout atmel_pmecc_oobinfo; >> + >> static int cpu_has_dma(void) >> { >> return cpu_is_at91sam9rl() || cpu_is_at91sam9g45(); >> @@ -287,6 +321,708 @@ static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len) >> } >> >> /* >> + * 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) >> +{ >> + void __iomem *p; >> + >> + switch (host->pmecc_sector_size) { >> + case 512: >> + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_512 + >> + PMECC_LOOKUP_TABLE_SIZE_512 * sizeof(int16_t); >> + break; >> + case 1024: >> + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_1024 + >> + PMECC_LOOKUP_TABLE_SIZE_1024 * sizeof(int16_t); >> + break; >> + default: >> + BUG(); >> + } >> + >> + return p; >> +} >> + >> +static void __iomem *pmecc_get_index_of(struct atmel_nand_host *host) > this is a __dev_init function plese check the other too > > btw you need to use __dev_init and not __init Here I use pmecc_get_index_of() function to get a lookup table base which is in ROM. I'm not clear about how should I need __dev_init here. Can you give more information? >> +{ >> + void __iomem *p; >> + >> + switch (host->pmecc_sector_size) { >> + case 512: >> + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_512; >> + break; >> + case 1024: >> + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_1024; >> + break; >> + default: >> + BUG(); >> + } >> + >> + 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->pmecc_corr_cap; i++) { >> + value = pmecc_readl_rem_relaxed(host->ecc, sector, i / 2); >> + value = (i& 1) ? (value& 0xffff0000)>> 16 : value& 0xffff; > simplify by > if (i& 1) > val>>= 16; > value&= 0xffff; I'll fix it. > >> + host->pmecc_data->partial_syn[(2 * i) + 1] = (int16_t)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 __iomem *alpha_to = host->pmecc_alpha_to; >> + int16_t __iomem *index_of = host->pmecc_index_of; >> + int16_t *partial_syn = host->pmecc_data->partial_syn; >> + >> + /* si[] is a table that holds the current syndrome value, >> + * an element of that table belongs to the field >> + */ >> + si = host->pmecc_data->si; >> + >> + for (i = 1; i< 2 * PMECC_MAX_ERROR_NB; i++) >> + si[i] = 0; > please use memset ok >> + >> + /* Computation 2t syndromes based on S(x) */ >> + /* Odd syndromes */ >> + for (i = 1; i< 2 * host->pmecc_corr_cap; i += 2) { >> + si[i] = 0; > shy this you already init the array at 0 before yes, I'll fix it. >> + for (j = 0; j< host->pmecc_degree; j++) { >> + if (partial_syn[i]& ((unsigned short)0x1<< j)) >> + si[i] = readw_relaxed(alpha_to + i * j) ^ si[i]; >> + } >> + } >> + /* Even syndrome = (Odd syndrome) ** 2 */ >> + for (i = 2; i<= 2 * host->pmecc_corr_cap; i += 2) { >> + j = i / 2; >> + if (si[j] == 0) > here if { > } else { > } ok >> + si[i] = 0; >> + else { >> + int16_t tmp; > missing blank line ok. >> + tmp = readw_relaxed(index_of + si[j]); >> + tmp = (tmp * 2) % host->pmecc_cw_len; >> + si[i] = readw_relaxed(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; >> + >> + int i, j, k; >> + uint32_t dmu_0_count, tmp; >> + int16_t (*smu)[2 * PMECC_MAX_ERROR_NB + 1]; >> + int16_t *lmu = host->pmecc_data->lmu; >> + int16_t *si = host->pmecc_data->si; >> + int *mu = host->pmecc_data->mu; >> + int *dmu = host->pmecc_data->dmu; /* Discrepancy */ >> + int *delta = host->pmecc_data->delta; /* Delta order */ >> + int cw_len = host->pmecc_cw_len; >> + int16_t cap = host->pmecc_corr_cap; >> + >> + int16_t __iomem *index_of = host->pmecc_index_of; >> + int16_t __iomem *alpha_to = host->pmecc_alpha_to; >> + >> + /* index of largest delta */ >> + int ro; >> + int largest; >> + int diff; >> + >> + dmu_0_count = 0; >> + smu = host->pmecc_data->smu; >> + >> + /* First Row */ >> + >> + /* Mu */ >> + mu[0] = -1; >> + >> + memset(&smu[0][0], 0, >> + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); >> + 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 */ >> + memset(&smu[1][0], 0, >> + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); >> + 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 */ >> + memset(&smu[cap + 1][0], 0, >> + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); >> + >> + 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][j] = smu[i][j]; >> + lmu[cap + 1] = lmu[i]; >> + return; >> + } >> + >> + /* copy polynom */ >> + for (j = 0; j<= lmu[i]>> 1; j++) >> + smu[i + 1][j] = 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 * PMECC_MAX_ERROR_NB + 1); k++) >> + smu[i+1][k] = 0; >> + >> + /* Compute smu[i+1] */ >> + for (k = 0; k<= lmu[ro]>> 1; k++) { >> + int16_t a, b, c; >> + >> + if (!(smu[ro][k]&& dmu[i])) >> + continue; >> + a = readw_relaxed(index_of + dmu[i]); >> + b = readw_relaxed(index_of + dmu[ro]); >> + c = readw_relaxed(index_of + smu[ro][k]); >> + tmp = a + (cw_len - b) + c; >> + a = readw_relaxed(alpha_to + tmp % cw_len); >> + smu[i + 1][k + diff] = a; >> + } >> + >> + for (k = 0; k<= lmu[i]>> 1; k++) >> + smu[i + 1][k] ^= 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 (smu[i+1][k]&& si[tmp + 3 - k]) { >> + int16_t a, b, c; >> + a = readw_relaxed(index_of + smu[i + 1][k]); >> + b = si[2 * (i - 1) + 3 - k]; >> + c = readw_relaxed(index_of + b); >> + tmp = a + c; >> + tmp %= cw_len; >> + dmu[i + 1] = readw_relaxed(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; >> + int timeout_count = 0; >> + int cap = host->pmecc_corr_cap; >> + >> + err_nbr = 0; >> + sector_size = host->pmecc_sector_size; >> + >> + pmerrloc_writel(host->pmerrloc_base, ELDIS, PMERRLOC_DISABLE); >> + >> + for (i = 0; i<= host->pmecc_data->lmu[cap + 1]>> 1; i++) { >> + pmerrloc_writel_sigma_relaxed(host->pmerrloc_base, i, >> + host->pmecc_data->smu[cap + 1][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); >> + >> + while (!(pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR) >> + & PMERRLOC_CALC_DONE)) { >> + if (unlikely(timeout_count++> PMECC_MAX_TIMEOUT_COUNT)) >> + return -1; /* Time out */ >> + cpu_relax(); >> + } >> + >> + 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_data->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, >> + 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->pmecc_sector_size; >> + ecc_size = nand_chip->ecc.bytes; >> + >> + while (err_nbr) { >> + tmp = pmerrloc_readl_el_relaxed(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_relaxed(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->pmecc_sector_number; i++) { >> + err_nbr = 0; >> + if (pmecc_stat& 0x1) { >> + buf_pos = buf + i * host->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, 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, int page) >> +{ >> + uint32_t stat; >> + int timeout_count = 0; >> + 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_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); >> + >> + while ((pmecc_readl_relaxed(host->ecc, SR)& PMECC_SR_BUSY)) { >> + if (unlikely(timeout_count++> PMECC_MAX_TIMEOUT_COUNT)) >> + return -EIO; /* Time out */ >> + cpu_relax(); >> + } >> + >> + 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 void atmel_nand_pmecc_write_page(struct mtd_info *mtd, >> + struct nand_chip *chip, const uint8_t *buf) >> +{ >> + int i, j; >> + int timeout_count = 0; >> + 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_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); >> + >> + while ((pmecc_readl_relaxed(host->ecc, SR)& PMECC_SR_BUSY)) { >> + if (unlikely(timeout_count++> PMECC_MAX_TIMEOUT_COUNT)) { >> + dev_err(host->dev, "PMECC: Timeout to get ECC value.\n"); >> + return; /* Time out */ >> + } >> + cpu_relax(); >> + } >> + >> + 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; >> +} >> + >> +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->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->pmecc_sector_size == 512) >> + val |= PMECC_CFG_SECTOR512; >> + else if (host->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 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->pmecc_corr_cap; >> + sector_size = host->pmecc_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; should be 512 or 1024 bytes\n", >> + sector_size); >> + return -EINVAL; >> + } >> + if ((cap != 2)&& (cap != 4)&& (cap != 8)&& (cap != 12)&& >> + (cap != 24)) { >> + dev_err(host->dev, >> + "Unsupported PMECC correction capability, should be 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 (!regs) { >> + dev_warn(host->dev, >> + "Can't get I/O resource regs, rolling back on software ECC\n"); >> + return 0; >> + } >> + >> + 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->pmecc_rom_base = ioremap(regs_rom->start, >> + resource_size(regs_rom)); >> + >> + if (host->pmerrloc_base&& host->pmecc_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 PMECC controller!\n"); >> + err_no = -EIO; >> + goto err_pmloc_ioremap; >> + } >> + } >> + >> + /* 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->pmecc_degree = PMECC_GF_DIMENSION_13; >> + host->pmecc_cw_len = (1<< host->pmecc_degree) - 1; >> + host->pmecc_corr_cap = cap; >> + 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 = pmecc_get_index_of(host); >> + >> + nand_chip->ecc.steps = 1; >> + nand_chip->ecc.strength = cap; >> + 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"); >> + err_no = -EINVAL; >> + goto err; >> + } >> + 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: >> + case 4096: >> + /* 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; >> + 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; >> + } >> + >> + /* Allocate data for PMECC computation */ >> + host->pmecc_data = kzalloc(sizeof(struct atmel_pmecc_data), GFP_KERNEL); > why do you always allocate the pmecc_data? > > you need to allocate it only if you use it If not using PMECC, the code will never come to here. So I think it's right time to allocate all the computation data here. > > Best Regards, > J. >> + if (!host->pmecc_data) { >> + dev_err(host->dev, >> + "Cannot allocate memory for PMECC computation!\n"); >> + err_no = -ENOMEM; >> + goto err; >> + } >> + >> + atmel_pmecc_core_init(mtd); >> + >> + return 0; >> + >> +err: >> +err_pmloc_ioremap: >> + iounmap(host->ecc); >> + if (host->pmerrloc_base) >> + iounmap(host->pmerrloc_base); >> + if (host->pmecc_rom_base) >> + iounmap(host->pmecc_rom_base); >> +err_pmecc_ioremap: >> + return err_no; >> +} >> + >> +/* >> * Calculate HW ECC >> * >> * function called after a write >> @@ -720,7 +1456,11 @@ static int __init atmel_nand_probe(struct platform_device *pdev) >> } >> >> if (nand_chip->ecc.mode == NAND_ECC_HW) { >> - res = atmel_hw_nand_init_params(pdev, host); >> + if (host->has_pmecc) >> + res = atmel_pmecc_nand_init_params(pdev, host); >> + else >> + res = atmel_hw_nand_init_params(pdev, host); >> + >> if (res != 0) >> goto err_hw_ecc; >> } >> @@ -741,6 +1481,12 @@ static int __init atmel_nand_probe(struct platform_device *pdev) >> err_scan_tail: >> if (host->ecc) >> iounmap(host->ecc); >> + if (host->has_pmecc) { > no need to check if you have teh pmecc > > if it's no the case pmerrloc_base will be NULLo > > don't you need to disable it in the error path? right, I should disable the hardware in this error path. > > Best Regards, > J. Best Regards, Josh Wu
On 5/27/2012 8:50 PM, Artem Bityutskiy wrote: > On Sat, 2012-05-26 at 21:24 +0800, Josh Wu wrote: >> + while ((pmecc_readl_relaxed(host->ecc, SR)& PMECC_SR_BUSY)) { >> + if (unlikely(timeout_count++> PMECC_MAX_TIMEOUT_COUNT)) { >> + dev_err(host->dev, "PMECC: Timeout to get ECC value.\n"); >> + return; /* Time out */ > How this error is communicated then up the the user? If this error happened, that should mean the PMECC is not configurated correctly. I think I only I can do is that prompt to user and then call BUG() here. > >> + } >> + cpu_relax(); >> + } > I see this pattern all over the place - why people consider it reliable? > Is this code guaranteed to run on the same CPU? > > Why not to use loops_per_jiffie * msecs_to_jiffies(TIMOUT) instead to > calculate how many iterations to do? Yes, due to HW register reading and > cpu_relax() the real timeout will be larger, but this is about error > anyway, so it does not hurt to iterate longer? > I will fix that in next version. thanks. Best Regards, Josh Wu
> >>+ > >>+static void __iomem *pmecc_get_index_of(struct atmel_nand_host *host) > >this is a __dev_init function plese check the other too > > > >btw you need to use __dev_init and not __init > > Here I use pmecc_get_index_of() function to get a lookup table base > which is in ROM. > I'm not clear about how should I need __dev_init here. Can you give > more information? it is the section where the function is going to be stored pmecc_get_index_of is use at probe time so it's __devinit section as it's supposed to be for the probe function too Best Regards, J.
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index 9a9bfbf..ddcf1ed 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 Multibit ECC support for various AT91 SoC + * (C) Copyright 2012 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 @@ -77,6 +79,21 @@ static struct nand_ecclayout atmel_oobinfo_small = { }, }; +/* a structure includes datas for PMECC computation */ +struct atmel_pmecc_data { + int16_t partial_syn[2 * PMECC_MAX_ERROR_NB + 1]; + int16_t si[2 * PMECC_MAX_ERROR_NB + 1]; + + /* Sigma table */ + int16_t smu[PMECC_MAX_ERROR_NB + 2][2 * PMECC_MAX_ERROR_NB + 1]; + /* polynomal order */ + int16_t lmu[PMECC_MAX_ERROR_NB + 1]; + + int mu[PMECC_MAX_ERROR_NB + 1]; + int dmu[PMECC_MAX_ERROR_NB + 1]; + int delta[PMECC_MAX_ERROR_NB + 1]; +}; + struct atmel_nand_host { struct nand_chip nand_chip; struct mtd_info mtd; @@ -92,8 +109,25 @@ struct atmel_nand_host { bool has_pmecc; u8 pmecc_corr_cap; u16 pmecc_sector_size; + + 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 */ + struct atmel_pmecc_data *pmecc_data; }; +static struct nand_ecclayout atmel_pmecc_oobinfo; + static int cpu_has_dma(void) { return cpu_is_at91sam9rl() || cpu_is_at91sam9g45(); @@ -287,6 +321,708 @@ static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len) } /* + * 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) +{ + void __iomem *p; + + switch (host->pmecc_sector_size) { + case 512: + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_512 + + PMECC_LOOKUP_TABLE_SIZE_512 * sizeof(int16_t); + break; + case 1024: + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_1024 + + PMECC_LOOKUP_TABLE_SIZE_1024 * sizeof(int16_t); + break; + default: + BUG(); + } + + return p; +} + +static void __iomem *pmecc_get_index_of(struct atmel_nand_host *host) +{ + void __iomem *p; + + switch (host->pmecc_sector_size) { + case 512: + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_512; + break; + case 1024: + p = host->pmecc_rom_base + PMECC_LOOKUP_TABLE_OFFSET_1024; + break; + default: + BUG(); + } + + 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->pmecc_corr_cap; i++) { + value = pmecc_readl_rem_relaxed(host->ecc, sector, i / 2); + value = (i & 1) ? (value & 0xffff0000) >> 16 : value & 0xffff; + host->pmecc_data->partial_syn[(2 * i) + 1] = (int16_t)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 __iomem *alpha_to = host->pmecc_alpha_to; + int16_t __iomem *index_of = host->pmecc_index_of; + int16_t *partial_syn = host->pmecc_data->partial_syn; + + /* si[] is a table that holds the current syndrome value, + * an element of that table belongs to the field + */ + si = host->pmecc_data->si; + + for (i = 1; i < 2 * PMECC_MAX_ERROR_NB; i++) + si[i] = 0; + + /* Computation 2t syndromes based on S(x) */ + /* Odd syndromes */ + for (i = 1; i < 2 * host->pmecc_corr_cap; i += 2) { + si[i] = 0; + for (j = 0; j < host->pmecc_degree; j++) { + if (partial_syn[i] & ((unsigned short)0x1 << j)) + si[i] = readw_relaxed(alpha_to + i * j) ^ si[i]; + } + } + /* Even syndrome = (Odd syndrome) ** 2 */ + for (i = 2; i <= 2 * host->pmecc_corr_cap; i += 2) { + j = i / 2; + if (si[j] == 0) + si[i] = 0; + else { + int16_t tmp; + tmp = readw_relaxed(index_of + si[j]); + tmp = (tmp * 2) % host->pmecc_cw_len; + si[i] = readw_relaxed(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; + + int i, j, k; + uint32_t dmu_0_count, tmp; + int16_t (*smu)[2 * PMECC_MAX_ERROR_NB + 1]; + int16_t *lmu = host->pmecc_data->lmu; + int16_t *si = host->pmecc_data->si; + int *mu = host->pmecc_data->mu; + int *dmu = host->pmecc_data->dmu; /* Discrepancy */ + int *delta = host->pmecc_data->delta; /* Delta order */ + int cw_len = host->pmecc_cw_len; + int16_t cap = host->pmecc_corr_cap; + + int16_t __iomem *index_of = host->pmecc_index_of; + int16_t __iomem *alpha_to = host->pmecc_alpha_to; + + /* index of largest delta */ + int ro; + int largest; + int diff; + + dmu_0_count = 0; + smu = host->pmecc_data->smu; + + /* First Row */ + + /* Mu */ + mu[0] = -1; + + memset(&smu[0][0], 0, + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); + 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 */ + memset(&smu[1][0], 0, + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); + 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 */ + memset(&smu[cap + 1][0], 0, + sizeof(int16_t) * (2 * PMECC_MAX_ERROR_NB + 1)); + + 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][j] = smu[i][j]; + lmu[cap + 1] = lmu[i]; + return; + } + + /* copy polynom */ + for (j = 0; j <= lmu[i] >> 1; j++) + smu[i + 1][j] = 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 * PMECC_MAX_ERROR_NB + 1); k++) + smu[i+1][k] = 0; + + /* Compute smu[i+1] */ + for (k = 0; k <= lmu[ro] >> 1; k++) { + int16_t a, b, c; + + if (!(smu[ro][k] && dmu[i])) + continue; + a = readw_relaxed(index_of + dmu[i]); + b = readw_relaxed(index_of + dmu[ro]); + c = readw_relaxed(index_of + smu[ro][k]); + tmp = a + (cw_len - b) + c; + a = readw_relaxed(alpha_to + tmp % cw_len); + smu[i + 1][k + diff] = a; + } + + for (k = 0; k <= lmu[i] >> 1; k++) + smu[i + 1][k] ^= 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 (smu[i+1][k] && si[tmp + 3 - k]) { + int16_t a, b, c; + a = readw_relaxed(index_of + smu[i + 1][k]); + b = si[2 * (i - 1) + 3 - k]; + c = readw_relaxed(index_of + b); + tmp = a + c; + tmp %= cw_len; + dmu[i + 1] = readw_relaxed(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; + int timeout_count = 0; + int cap = host->pmecc_corr_cap; + + err_nbr = 0; + sector_size = host->pmecc_sector_size; + + pmerrloc_writel(host->pmerrloc_base, ELDIS, PMERRLOC_DISABLE); + + for (i = 0; i <= host->pmecc_data->lmu[cap + 1] >> 1; i++) { + pmerrloc_writel_sigma_relaxed(host->pmerrloc_base, i, + host->pmecc_data->smu[cap + 1][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); + + while (!(pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR) + & PMERRLOC_CALC_DONE)) { + if (unlikely(timeout_count++ > PMECC_MAX_TIMEOUT_COUNT)) + return -1; /* Time out */ + cpu_relax(); + } + + 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_data->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, + 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->pmecc_sector_size; + ecc_size = nand_chip->ecc.bytes; + + while (err_nbr) { + tmp = pmerrloc_readl_el_relaxed(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_relaxed(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->pmecc_sector_number; i++) { + err_nbr = 0; + if (pmecc_stat & 0x1) { + buf_pos = buf + i * host->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, 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, int page) +{ + uint32_t stat; + int timeout_count = 0; + 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_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); + + while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) { + if (unlikely(timeout_count++ > PMECC_MAX_TIMEOUT_COUNT)) + return -EIO; /* Time out */ + cpu_relax(); + } + + 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 void atmel_nand_pmecc_write_page(struct mtd_info *mtd, + struct nand_chip *chip, const uint8_t *buf) +{ + int i, j; + int timeout_count = 0; + 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_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); + + while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) { + if (unlikely(timeout_count++ > PMECC_MAX_TIMEOUT_COUNT)) { + dev_err(host->dev, "PMECC: Timeout to get ECC value.\n"); + return; /* Time out */ + } + cpu_relax(); + } + + 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; +} + +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->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->pmecc_sector_size == 512) + val |= PMECC_CFG_SECTOR512; + else if (host->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 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->pmecc_corr_cap; + sector_size = host->pmecc_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; should be 512 or 1024 bytes\n", + sector_size); + return -EINVAL; + } + if ((cap != 2) && (cap != 4) && (cap != 8) && (cap != 12) && + (cap != 24)) { + dev_err(host->dev, + "Unsupported PMECC correction capability, should be 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 (!regs) { + dev_warn(host->dev, + "Can't get I/O resource regs, rolling back on software ECC\n"); + return 0; + } + + 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->pmecc_rom_base = ioremap(regs_rom->start, + resource_size(regs_rom)); + + if (host->pmerrloc_base && host->pmecc_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 PMECC controller!\n"); + err_no = -EIO; + goto err_pmloc_ioremap; + } + } + + /* 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->pmecc_degree = PMECC_GF_DIMENSION_13; + host->pmecc_cw_len = (1 << host->pmecc_degree) - 1; + host->pmecc_corr_cap = cap; + 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 = pmecc_get_index_of(host); + + nand_chip->ecc.steps = 1; + nand_chip->ecc.strength = cap; + 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"); + err_no = -EINVAL; + goto err; + } + 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: + case 4096: + /* 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; + 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; + } + + /* Allocate data for PMECC computation */ + host->pmecc_data = kzalloc(sizeof(struct atmel_pmecc_data), GFP_KERNEL); + if (!host->pmecc_data) { + dev_err(host->dev, + "Cannot allocate memory for PMECC computation!\n"); + err_no = -ENOMEM; + goto err; + } + + atmel_pmecc_core_init(mtd); + + return 0; + +err: +err_pmloc_ioremap: + iounmap(host->ecc); + if (host->pmerrloc_base) + iounmap(host->pmerrloc_base); + if (host->pmecc_rom_base) + iounmap(host->pmecc_rom_base); +err_pmecc_ioremap: + return err_no; +} + +/* * Calculate HW ECC * * function called after a write @@ -720,7 +1456,11 @@ static int __init atmel_nand_probe(struct platform_device *pdev) } if (nand_chip->ecc.mode == NAND_ECC_HW) { - res = atmel_hw_nand_init_params(pdev, host); + if (host->has_pmecc) + res = atmel_pmecc_nand_init_params(pdev, host); + else + res = atmel_hw_nand_init_params(pdev, host); + if (res != 0) goto err_hw_ecc; } @@ -741,6 +1481,12 @@ static int __init atmel_nand_probe(struct platform_device *pdev) err_scan_tail: if (host->ecc) iounmap(host->ecc); + if (host->has_pmecc) { + if (host->pmerrloc_base) + iounmap(host->pmerrloc_base); + if (host->pmecc_rom_base) + iounmap(host->pmecc_rom_base); + } err_hw_ecc: err_scan_ident: err_no_card: @@ -766,6 +1512,19 @@ static int __exit atmel_nand_remove(struct platform_device *pdev) atmel_nand_disable(host); + if (host->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->pmecc_rom_base) + iounmap(host->pmecc_rom_base); + + kfree(host->pmecc_data); + } + if (host->ecc) iounmap(host->ecc); diff --git a/drivers/mtd/nand/atmel_nand_ecc.h b/drivers/mtd/nand/atmel_nand_ecc.h index 5cbff11..bd404bf 100644 --- a/drivers/mtd/nand/atmel_nand_ecc.h +++ b/drivers/mtd/nand/atmel_nand_ecc.h @@ -45,4 +45,120 @@ #define ecc_writel(add, reg, value) \ 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_relaxed(addr, reg) \ + readl_relaxed((addr) + ATMEL_PMECC_##reg) + +#define pmecc_writel(addr, reg, value) \ + writel((value), (addr) + ATMEL_PMECC_##reg) + +#define pmecc_readb_ecc_relaxed(addr, sector, n) \ + readb_relaxed((addr) + ATMEL_PMECC_ECCx + ((sector) * 0x40) + (n)) + +#define pmecc_readl_rem_relaxed(addr, sector, n) \ + readl_relaxed((addr) + ATMEL_PMECC_REMx + ((sector) * 0x40) + ((n) * 4)) + +#define pmerrloc_readl_relaxed(addr, reg) \ + readl_relaxed((addr) + ATMEL_PMERRLOC_##reg) + +#define pmerrloc_writel(addr, reg, value) \ + writel((value), (addr) + ATMEL_PMERRLOC_##reg) + +#define pmerrloc_writel_sigma_relaxed(addr, n, value) \ + writel_relaxed((value), (addr) + ATMEL_PMERRLOC_SIGMAx + ((n) * 4)) + +#define pmerrloc_readl_sigma_relaxed(addr, n) \ + readl_relaxed((addr) + ATMEL_PMERRLOC_SIGMAx + ((n) * 4)) + +#define pmerrloc_readl_el_relaxed(addr, n) \ + readl_relaxed((addr) + ATMEL_PMERRLOC_ELx + ((n) * 4)) + +/* Galois field dimension */ +#define PMECC_GF_DIMENSION_13 13 +#define PMECC_GF_DIMENSION_14 14 + +#define PMECC_MAX_ERROR_NB 25 +#define PMECC_MAX_ECC_BYTES 42 +#define PMECC_MAX_NB_SECTOR 8 +#define PMECC_MAX_TIMEOUT_COUNT 100 + +#define PMECC_LOOKUP_TABLE_OFFSET_512 0x8000 +#define PMECC_LOOKUP_TABLE_SIZE_512 0x2000 +#define PMECC_LOOKUP_TABLE_OFFSET_1024 0x10000 +#define PMECC_LOOKUP_TABLE_SIZE_1024 0x4000 + #endif