diff options
| -rw-r--r-- | doc/README.atmel_pmecc | 44 | ||||
| -rw-r--r-- | drivers/mtd/nand/atmel_nand.c | 680 | ||||
| -rw-r--r-- | drivers/mtd/nand/atmel_nand_ecc.h | 113 |
3 files changed, 836 insertions, 1 deletions
diff --git a/doc/README.atmel_pmecc b/doc/README.atmel_pmecc new file mode 100644 index 0000000..b483744 --- /dev/null +++ b/doc/README.atmel_pmecc @@ -0,0 +1,44 @@ +How to enable PMECC(Programmable Multibit ECC) for nand on Atmel SoCs +----------------------------------------------------------- +2012-08-22 Josh Wu <josh.wu@atmel.com> + +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 (512 or +1024 bytes) of data. + +Following Atmel AT91 products support PMECC. +- AT91SAM9X25, X35, G25, G15, G35 (tested) +- AT91SAM9N12 (not tested, Should work) + +As soon as your nand flash software ECC works, you can enable PMECC. + +To use PMECC in this driver, the user needs to set: + 1. the PMECC correction error bits capability: CONFIG_PMECC_CAP. + It can be 2, 4, 8, 12 or 24. + 2. The PMECC sector size: CONFIG_PMECC_SECTOR_SIZE. + It only can be 512 or 1024. + 3. The PMECC index lookup table's offsets in ROM code: CONFIG_PMECC_INDEX_TABLE_OFFSET. + In the chip datasheet section "Boot Stragegies", you can find + two Galois Field Table in the ROM code. One table is for 512-bytes + sector. Another is for 1024-byte sector. Each Galois Field includes + two sub-table: indext table & alpha table. + In the beginning of each Galois Field Table is the index table, + Alpha table is in the following. + So the index table's offset is same as the Galois Field Table. + + Please set CONFIG_PMECC_INDEX_TABLE_OFFSET correctly according the + Galois Field Table's offset base on the sector size you used. + +Take AT91SAM9X5EK as an example, the board definition file likes: + +/* PMECC & PMERRLOC */ +#define CONFIG_ATMEL_NAND_HWECC 1 +#define CONFIG_ATMEL_NAND_HW_PMECC 1 +#define CONFIG_PMECC_CAP 2 +#define CONFIG_PMECC_SECTOR_SIZE 512 +#define CONFIG_PMECC_INDEX_TABLE_OFFSET 0x8000 + +NOTE: If you use 1024 as the sector size, then need set 0x10000 as the + CONFIG_PMECC_INDEX_TABLE_OFFSET diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index cc609b1..c6aa5db 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -5,6 +5,9 @@ * * (C) Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas * + * Add Programmable Multibit ECC support for various AT91 SoC + * (C) Copyright 2012 ATMEL, Hong Xu + * * See file CREDITS for list of people who contributed to this * project. * @@ -30,6 +33,7 @@ #include <asm/arch/at91_pio.h> #include <nand.h> +#include <watchdog.h> #ifdef CONFIG_ATMEL_NAND_HWECC @@ -41,6 +45,674 @@ #include "atmel_nand_ecc.h" /* Hardware ECC registers */ +#ifdef CONFIG_ATMEL_NAND_HW_PMECC + +struct atmel_nand_host { + struct pmecc_regs __iomem *pmecc; + struct pmecc_errloc_regs __iomem *pmerrloc; + void __iomem *pmecc_rom_base; + + u8 pmecc_corr_cap; + u16 pmecc_sector_size; + u32 pmecc_index_table_offset; + + int pmecc_bytes_per_sector; + int pmecc_sector_number; + int pmecc_degree; /* Degree of remainders */ + int pmecc_cw_len; /* Length of codeword */ + + /* lookup table for alpha_to and index_of */ + void __iomem *pmecc_alpha_to; + void __iomem *pmecc_index_of; + + /* data for pmecc computation */ + int16_t pmecc_smu[(CONFIG_PMECC_CAP + 2) * (2 * CONFIG_PMECC_CAP + 1)]; + int16_t pmecc_partial_syn[2 * CONFIG_PMECC_CAP + 1]; + int16_t pmecc_si[2 * CONFIG_PMECC_CAP + 1]; + int16_t pmecc_lmu[CONFIG_PMECC_CAP + 1]; /* polynomal order */ + int pmecc_mu[CONFIG_PMECC_CAP + 1]; + int pmecc_dmu[CONFIG_PMECC_CAP + 1]; + int pmecc_delta[CONFIG_PMECC_CAP + 1]; +}; + +static struct atmel_nand_host pmecc_host; +static struct nand_ecclayout atmel_pmecc_oobinfo; + +/* + * Return number of ecc bytes per sector according to sector size and + * correction capability + * + * Following table shows what at91 PMECC supported: + * Correction Capability Sector_512_bytes Sector_1024_bytes + * ===================== ================ ================= + * 2-bits 4-bytes 4-bytes + * 4-bits 7-bytes 7-bytes + * 8-bits 13-bytes 14-bytes + * 12-bits 20-bytes 21-bytes + * 24-bits 39-bytes 42-bytes + */ +static int pmecc_get_ecc_bytes(int cap, int sector_size) +{ + int m = 12 + sector_size / 512; + return (m * cap + 7) / 8; +} + +static void pmecc_config_ecc_layout(struct nand_ecclayout *layout, + int oobsize, int ecc_len) +{ + int i; + + layout->eccbytes = ecc_len; + + /* ECC will occupy the last ecc_len bytes continuously */ + for (i = 0; i < ecc_len; i++) + layout->eccpos[i] = oobsize - ecc_len + i; + + layout->oobfree[0].offset = 2; + layout->oobfree[0].length = + oobsize - ecc_len - layout->oobfree[0].offset; +} + +static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host) +{ + int table_size; + + table_size = host->pmecc_sector_size == 512 ? + PMECC_INDEX_TABLE_SIZE_512 : PMECC_INDEX_TABLE_SIZE_1024; + + /* the ALPHA lookup table is right behind the INDEX lookup table. */ + return host->pmecc_rom_base + host->pmecc_index_table_offset + + table_size * sizeof(int16_t); +} + +static void pmecc_gen_syndrome(struct mtd_info *mtd, int sector) +{ + struct nand_chip *nand_chip = mtd->priv; + struct atmel_nand_host *host = nand_chip->priv; + int i; + uint32_t value; + + /* Fill odd syndromes */ + for (i = 0; i < host->pmecc_corr_cap; i++) { + value = readl(&host->pmecc->rem_port[sector].rem[i / 2]); + if (i & 1) + value >>= 16; + value &= 0xffff; + host->pmecc_partial_syn[(2 * i) + 1] = (int16_t)value; + } +} + +static void pmecc_substitute(struct mtd_info *mtd) +{ + struct nand_chip *nand_chip = mtd->priv; + struct atmel_nand_host *host = nand_chip->priv; + int16_t __iomem *alpha_to = host->pmecc_alpha_to; + int16_t __iomem *index_of = host->pmecc_index_of; + int16_t *partial_syn = host->pmecc_partial_syn; + const int cap = host->pmecc_corr_cap; + int16_t *si; + int i, j; + + /* si[] is a table that holds the current syndrome value, + * an element of that table belongs to the field + */ + si = host->pmecc_si; + + memset(&si[1], 0, sizeof(int16_t) * (2 * cap - 1)); + + /* Computation 2t syndromes based on S(x) */ + /* Odd syndromes */ + for (i = 1; i < 2 * cap; i += 2) { + for (j = 0; j < host->pmecc_degree; j++) { + if (partial_syn[i] & (0x1 << j)) + si[i] = readw(alpha_to + i * j) ^ si[i]; + } + } + /* Even syndrome = (Odd syndrome) ** 2 */ + for (i = 2, j = 1; j <= cap; i = ++j << 1) { + if (si[j] == 0) { + si[i] = 0; + } else { + int16_t tmp; + + tmp = readw(index_of + si[j]); + tmp = (tmp * 2) % host->pmecc_cw_len; + si[i] = readw(alpha_to + tmp); + } + } +} + +/* + * This function defines a Berlekamp iterative procedure for + * finding the value of the error location polynomial. + * The input is si[], initialize by pmecc_substitute(). + * The output is smu[][]. + * + * This function is written according to chip datasheet Chapter: + * Find the Error Location Polynomial Sigma(x) of Section: + * Programmable Multibit ECC Control (PMECC). + */ +static void pmecc_get_sigma(struct mtd_info *mtd) +{ + struct nand_chip *nand_chip = mtd->priv; + struct atmel_nand_host *host = nand_chip->priv; + + int16_t *lmu = host->pmecc_lmu; + int16_t *si = host->pmecc_si; + int *mu = host->pmecc_mu; + int *dmu = host->pmecc_dmu; /* Discrepancy */ + int *delta = host->pmecc_delta; /* Delta order */ + int cw_len = host->pmecc_cw_len; + const int16_t cap = host->pmecc_corr_cap; + const int num = 2 * cap + 1; + int16_t __iomem *index_of = host->pmecc_index_of; + int16_t __iomem *alpha_to = host->pmecc_alpha_to; + int i, j, k; + uint32_t dmu_0_count, tmp; + int16_t *smu = host->pmecc_smu; + + /* index of largest delta */ + int ro; + int largest; + int diff; + + /* Init the Sigma(x) */ + memset(smu, 0, sizeof(int16_t) * ARRAY_SIZE(smu)); + + dmu_0_count = 0; + + /* First Row */ + + /* Mu */ + mu[0] = -1; + + smu[0] = 1; + + /* discrepancy set to 1 */ + dmu[0] = 1; + /* polynom order set to 0 */ + lmu[0] = 0; + /* delta[0] = (mu[0] * 2 - lmu[0]) >> 1; */ + delta[0] = -1; + + /* Second Row */ + + /* Mu */ + mu[1] = 0; + /* Sigma(x) set to 1 */ + smu[num] = 1; + + /* discrepancy set to S1 */ + dmu[1] = si[1]; + + /* polynom order set to 0 */ + lmu[1] = 0; + + /* delta[1] = (mu[1] * 2 - lmu[1]) >> 1; */ + delta[1] = 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++) + smu[(cap + 1) * num + j] = + smu[i * num + j]; + + lmu[cap + 1] = lmu[i]; + return; + } + + /* copy polynom */ + for (j = 0; j <= lmu[i] >> 1; j++) + smu[(i + 1) * num + j] = smu[i * num + j]; + + /* copy previous polynom order to the next */ + lmu[i + 1] = lmu[i]; + } else { + ro = 0; + largest = -1; + /* find largest delta with dmu != 0 */ + for (j = 0; j < i; j++) { + if ((dmu[j]) && (delta[j] > largest)) { + largest = delta[j]; + ro = j; + } + } + + /* compute difference */ + diff = (mu[i] - mu[ro]); + + /* Compute degree of the new smu polynomial */ + if ((lmu[i] >> 1) > ((lmu[ro] >> 1) + diff)) + lmu[i + 1] = lmu[i]; + else + lmu[i + 1] = ((lmu[ro] >> 1) + diff) * 2; + + /* Init smu[i+1] with 0 */ + for (k = 0; k < num; k++) + smu[(i + 1) * num + k] = 0; + + /* Compute smu[i+1] */ + for (k = 0; k <= lmu[ro] >> 1; k++) { + int16_t a, b, c; + + if (!(smu[ro * num + k] && dmu[i])) + continue; + a = readw(index_of + dmu[i]); + b = readw(index_of + dmu[ro]); + c = readw(index_of + smu[ro * num + k]); + tmp = a + (cw_len - b) + c; + a = readw(alpha_to + tmp % cw_len); + smu[(i + 1) * num + (k + diff)] = a; + } + + for (k = 0; k <= lmu[i] >> 1; k++) + smu[(i + 1) * num + k] ^= smu[i * num + k]; + } + + /* End Computing Sigma (Mu+1) and L(mu) */ + /* In either case compute delta */ + delta[i + 1] = (mu[i + 1] * 2 - lmu[i + 1]) >> 1; + + /* Do not compute discrepancy for the last iteration */ + if (i >= cap) + continue; + + for (k = 0; k <= (lmu[i + 1] >> 1); k++) { + tmp = 2 * (i - 1); + if (k == 0) { + dmu[i + 1] = si[tmp + 3]; + } else if (smu[(i + 1) * num + k] && si[tmp + 3 - k]) { + int16_t a, b, c; + a = readw(index_of + + smu[(i + 1) * num + k]); + b = si[2 * (i - 1) + 3 - k]; + c = readw(index_of + b); + tmp = a + c; + tmp %= cw_len; + dmu[i + 1] = readw(alpha_to + tmp) ^ + dmu[i + 1]; + } + } + } +} + +static int pmecc_err_location(struct mtd_info *mtd) +{ + struct nand_chip *nand_chip = mtd->priv; + struct atmel_nand_host *host = nand_chip->priv; + const int cap = host->pmecc_corr_cap; + const int num = 2 * cap + 1; + int sector_size = host->pmecc_sector_size; + int err_nbr = 0; /* number of error */ + int roots_nbr; /* number of roots */ + int i; + uint32_t val; + int16_t *smu = host->pmecc_smu; + int timeout = PMECC_MAX_TIMEOUT_US; + + writel(PMERRLOC_DISABLE, &host->pmerrloc->eldis); + + for (i = 0; i <= host->pmecc_lmu[cap + 1] >> 1; i++) { + writel(smu[(cap + 1) * num + i], &host->pmerrloc->sigma[i]); + err_nbr++; + } + + val = PMERRLOC_ELCFG_NUM_ERRORS(err_nbr - 1); + if (sector_size == 1024) + val |= PMERRLOC_ELCFG_SECTOR_1024; + + writel(val, &host->pmerrloc->elcfg); + writel(sector_size * 8 + host->pmecc_degree * cap, + &host->pmerrloc->elen); + + while (--timeout) { + if (readl(&host->pmerrloc->elisr) & PMERRLOC_CALC_DONE) + break; + WATCHDOG_RESET(); + udelay(1); + } + + if (!timeout) { + printk(KERN_ERR "atmel_nand : Timeout to calculate PMECC error location\n"); + return -1; + } + + roots_nbr = (readl(&host->pmerrloc->elisr) & PMERRLOC_ERR_NUM_MASK) + >> 8; + /* Number of roots == degree of smu hence <= cap */ + if (roots_nbr == host->pmecc_lmu[cap + 1] >> 1) + return err_nbr - 1; + + /* Number of roots does not match the degree of smu + * unable to correct error */ + return -1; +} + +static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc, + int sector_num, int extra_bytes, int err_nbr) +{ + struct nand_chip *nand_chip = mtd->priv; + struct atmel_nand_host *host = nand_chip->priv; + int i = 0; + int byte_pos, bit_pos, sector_size, pos; + uint32_t tmp; + uint8_t err_byte; + + sector_size = host->pmecc_sector_size; + + while (err_nbr) { + tmp = readl(&host->pmerrloc->el[i]) - 1; + byte_pos = tmp / 8; + bit_pos = tmp % 8; + + if (byte_pos >= (sector_size + extra_bytes)) + BUG(); /* should never happen */ + + if (byte_pos < sector_size) { + err_byte = *(buf + byte_pos); + *(buf + byte_pos) ^= (1 << bit_pos); + + pos = sector_num * host->pmecc_sector_size + byte_pos; + printk(KERN_INFO "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n", + pos, bit_pos, err_byte, *(buf + byte_pos)); + } else { + /* Bit flip in OOB area */ + tmp = sector_num * host->pmecc_bytes_per_sector + + (byte_pos - sector_size); + err_byte = ecc[tmp]; + ecc[tmp] ^= (1 << bit_pos); + + pos = tmp + nand_chip->ecc.layout->eccpos[0]; + printk(KERN_INFO "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n", + pos, bit_pos, err_byte, ecc[tmp]); + } + + i++; + err_nbr--; + } + + return; +} + +static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf, + u8 *ecc) +{ + struct nand_chip *nand_chip = mtd->priv; + struct atmel_nand_host *host = nand_chip->priv; + int i, err_nbr, eccbytes; + uint8_t *buf_pos; + + eccbytes = nand_chip->ecc.bytes; + for (i = 0; i < eccbytes; i++) + if (ecc[i] != 0xff) + goto normal_check; + /* Erased page, return OK */ + return 0; + +normal_check: + for (i = 0; i < host->pmecc_sector_number; i++) { + err_nbr = 0; + if (pmecc_stat & 0x1) { + buf_pos = buf + i * host->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) { + printk(KERN_ERR "PMECC: Too many errors\n"); + mtd->ecc_stats.failed++; + return -EIO; + } else { + pmecc_correct_data(mtd, buf_pos, ecc, i, + host->pmecc_bytes_per_sector, err_nbr); + mtd->ecc_stats.corrected += err_nbr; + } + } + pmecc_stat >>= 1; + } + + return 0; +} + +static int atmel_nand_pmecc_read_page(struct mtd_info *mtd, + struct nand_chip *chip, uint8_t *buf, int page) +{ + struct atmel_nand_host *host = chip->priv; + int eccsize = chip->ecc.size; + uint8_t *oob = chip->oob_poi; + uint32_t *eccpos = chip->ecc.layout->eccpos; + uint32_t stat; + int timeout = PMECC_MAX_TIMEOUT_US; + + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST); + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DISABLE); + pmecc_writel(host->pmecc, cfg, ((pmecc_readl(host->pmecc, cfg)) + & ~PMECC_CFG_WRITE_OP) | PMECC_CFG_AUTO_ENABLE); + + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE); + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DATA); + + chip->read_buf(mtd, buf, eccsize); + chip->read_buf(mtd, oob, mtd->oobsize); + + while (--timeout) { + if (!(pmecc_readl(host->pmecc, sr) & PMECC_SR_BUSY)) + break; + WATCHDOG_RESET(); + udelay(1); + } + + if (!timeout) { + printk(KERN_ERR "atmel_nand : Timeout to read PMECC page\n"); + return -1; + } + + stat = pmecc_readl(host->pmecc, 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) +{ + struct atmel_nand_host *host = chip->priv; + uint32_t *eccpos = chip->ecc.layout->eccpos; + int i, j; + int timeout = PMECC_MAX_TIMEOUT_US; + + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST); + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DISABLE); + + pmecc_writel(host->pmecc, cfg, (pmecc_readl(host->pmecc, cfg) | + PMECC_CFG_WRITE_OP) & ~PMECC_CFG_AUTO_ENABLE); + + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE); + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DATA); + + chip->write_buf(mtd, (u8 *)buf, mtd->writesize); + + while (--timeout) { + if (!(pmecc_readl(host->pmecc, sr) & PMECC_SR_BUSY)) + break; + WATCHDOG_RESET(); + udelay(1); + } + + if (!timeout) { + printk(KERN_ERR "atmel_nand : Timeout to read PMECC status, fail to write PMECC in oob\n"); + return; + } + + 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]] = + readb(&host->pmecc->ecc_port[i].ecc[j]); + } + } + chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); +} + +static void atmel_pmecc_core_init(struct mtd_info *mtd) +{ + struct nand_chip *nand_chip = mtd->priv; + struct atmel_nand_host *host = nand_chip->priv; + uint32_t val = 0; + struct nand_ecclayout *ecc_layout; + + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST); + pmecc_writel(host->pmecc, 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->pmecc, cfg, val); + + ecc_layout = nand_chip->ecc.layout; + pmecc_writel(host->pmecc, sarea, mtd->oobsize - 1); + pmecc_writel(host->pmecc, saddr, ecc_layout->eccpos[0]); + pmecc_writel(host->pmecc, eaddr, + ecc_layout->eccpos[ecc_layout->eccbytes - 1]); + /* See datasheet about PMECC Clock Control Register */ + pmecc_writel(host->pmecc, clk, PMECC_CLK_133MHZ); + pmecc_writel(host->pmecc, idr, 0xff); + pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE); +} + +static int atmel_pmecc_nand_init_params(struct nand_chip *nand, + struct mtd_info *mtd) +{ + struct atmel_nand_host *host; + int cap, sector_size; + + host = nand->priv = &pmecc_host; + + nand->ecc.mode = NAND_ECC_HW; + nand->ecc.calculate = NULL; + nand->ecc.correct = NULL; + nand->ecc.hwctl = NULL; + + cap = host->pmecc_corr_cap = CONFIG_PMECC_CAP; + sector_size = host->pmecc_sector_size = CONFIG_PMECC_SECTOR_SIZE; + host->pmecc_index_table_offset = CONFIG_PMECC_INDEX_TABLE_OFFSET; + + printk(KERN_INFO "Initialize PMECC params, cap: %d, sector: %d\n", + cap, sector_size); + + host->pmecc = (struct pmecc_regs __iomem *) ATMEL_BASE_PMECC; + host->pmerrloc = (struct pmecc_errloc_regs __iomem *) + ATMEL_BASE_PMERRLOC; + host->pmecc_rom_base = (void __iomem *) ATMEL_BASE_ROM; + + /* ECC is calculated for the whole page (1 step) */ + nand->ecc.size = mtd->writesize; + + /* set ECC page size and oob layout */ + switch (mtd->writesize) { + case 2048: + case 4096: + host->pmecc_degree = PMECC_GF_DIMENSION_13; + host->pmecc_cw_len = (1 << host->pmecc_degree) - 1; + host->pmecc_sector_number = mtd->writesize / sector_size; + host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes( + cap, sector_size); + host->pmecc_alpha_to = pmecc_get_alpha_to(host); + host->pmecc_index_of = host->pmecc_rom_base + + host->pmecc_index_table_offset; + + nand->ecc.steps = 1; + nand->ecc.bytes = host->pmecc_bytes_per_sector * + host->pmecc_sector_number; + if (nand->ecc.bytes > mtd->oobsize - 2) { + printk(KERN_ERR "No room for ECC bytes\n"); + return -EINVAL; + } + pmecc_config_ecc_layout(&atmel_pmecc_oobinfo, + mtd->oobsize, + nand->ecc.bytes); + nand->ecc.layout = &atmel_pmecc_oobinfo; + break; + case 512: + case 1024: + /* TODO */ + printk(KERN_ERR "Unsupported page size for PMECC, use Software ECC\n"); + default: + /* page size not handled by HW ECC */ + /* switching back to soft ECC */ + nand->ecc.mode = NAND_ECC_SOFT; + nand->ecc.read_page = NULL; + nand->ecc.postpad = 0; + nand->ecc.prepad = 0; + nand->ecc.bytes = 0; + return 0; + } + + nand->ecc.read_page = atmel_nand_pmecc_read_page; + nand->ecc.write_page = atmel_nand_pmecc_write_page; + + atmel_pmecc_core_init(mtd); + + return 0; +} + +#else + /* oob layout for large page size * bad block info is on bytes 0 and 1 * the bytes have to be consecutives to avoid @@ -285,7 +957,9 @@ int atmel_hwecc_nand_init_param(struct nand_chip *nand, struct mtd_info *mtd) return 0; } -#endif +#endif /* CONFIG_ATMEL_NAND_HW_PMECC */ + +#endif /* CONFIG_ATMEL_NAND_HWECC */ static void at91_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) @@ -350,7 +1024,11 @@ int atmel_nand_chip_init(int devnum, ulong base_addr) return ret; #ifdef CONFIG_ATMEL_NAND_HWECC +#ifdef CONFIG_ATMEL_NAND_HW_PMECC + ret = atmel_pmecc_nand_init_params(nand, mtd); +#else ret = atmel_hwecc_nand_init_param(nand, mtd); +#endif if (ret) return ret; #endif diff --git a/drivers/mtd/nand/atmel_nand_ecc.h b/drivers/mtd/nand/atmel_nand_ecc.h index 1ee7f99..4732582 100644 --- a/drivers/mtd/nand/atmel_nand_ecc.h +++ b/drivers/mtd/nand/atmel_nand_ecc.h @@ -33,4 +33,117 @@ #define ATMEL_ECC_NPR 0x10 /* NParity register */ #define ATMEL_ECC_NPARITY (0xffff << 0) /* NParity */ +/* Register access macros for PMECC */ +#define pmecc_readl(addr, reg) \ + readl(&addr->reg) + +#define pmecc_writel(addr, reg, value) \ + writel((value), &addr->reg) + +/* PMECC Register Definitions */ +#define PMECC_MAX_SECTOR_NUM 8 +struct pmecc_regs { + u32 cfg; /* 0x00 PMECC Configuration Register */ + u32 sarea; /* 0x04 PMECC Spare Area Size Register */ + u32 saddr; /* 0x08 PMECC Start Address Register */ + u32 eaddr; /* 0x0C PMECC End Address Register */ + u32 clk; /* 0x10 PMECC Clock Control Register */ + u32 ctrl; /* 0x14 PMECC Control Register */ + u32 sr; /* 0x18 PMECC Status Register */ + u32 ier; /* 0x1C PMECC Interrupt Enable Register */ + u32 idr; /* 0x20 PMECC Interrupt Disable Register */ + u32 imr; /* 0x24 PMECC Interrupt Mask Register */ + u32 isr; /* 0x28 PMECC Interrupt Status Register */ + u32 reserved0[5]; /* 0x2C-0x3C Reserved */ + + /* 0x40 + sector_num * (0x40), Redundancy Registers */ + struct { + u8 ecc[44]; /* PMECC Generated Redundancy Byte Per Sector */ + u32 reserved1[5]; + } ecc_port[PMECC_MAX_SECTOR_NUM]; + + /* 0x240 + sector_num * (0x40) Remainder Registers */ + struct { + u32 rem[12]; + u32 reserved2[4]; + } rem_port[PMECC_MAX_SECTOR_NUM]; + u32 reserved3[16]; /* 0x440-0x47C Reserved */ +}; + +/* For PMECC 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) + +/* For PMECC Clock Control Register */ +#define PMECC_CLK_133MHZ (2 << 0) + +/* For 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) + +/* For PMECC Status Register */ +#define PMECC_SR_BUSY (1 << 0) +#define PMECC_SR_ENABLE (1 << 4) + +/* PMERRLOC Register Definitions */ +struct pmecc_errloc_regs { + u32 elcfg; /* 0x00 Error Location Configuration Register */ + u32 elprim; /* 0x04 Error Location Primitive Register */ + u32 elen; /* 0x08 Error Location Enable Register */ + u32 eldis; /* 0x0C Error Location Disable Register */ + u32 elsr; /* 0x10 Error Location Status Register */ + u32 elier; /* 0x14 Error Location Interrupt Enable Register */ + u32 elidr; /* 0x08 Error Location Interrupt Disable Register */ + u32 elimr; /* 0x0C Error Location Interrupt Mask Register */ + u32 elisr; /* 0x20 Error Location Interrupt Status Register */ + u32 reserved0; /* 0x24 Reserved */ + u32 sigma[25]; /* 0x28-0x88 Error Location Sigma Registers */ + u32 el[24]; /* 0x8C-0xE8 Error Location Registers */ + u32 reserved1[5]; /* 0xEC-0xFC Reserved */ +}; + +/* For Error Location Configuration Register */ +#define PMERRLOC_ELCFG_SECTOR_512 (0 << 0) +#define PMERRLOC_ELCFG_SECTOR_1024 (1 << 0) +#define PMERRLOC_ELCFG_NUM_ERRORS(n) ((n) << 16) + +/* For Error Location Disable Register */ +#define PMERRLOC_DISABLE (1 << 0) + +/* For Error Location Interrupt Status Register */ +#define PMERRLOC_ERR_NUM_MASK (0x1f << 8) +#define PMERRLOC_CALC_DONE (1 << 0) + +/* Galois field dimension */ +#define PMECC_GF_DIMENSION_13 13 +#define PMECC_GF_DIMENSION_14 14 + +#define PMECC_INDEX_TABLE_SIZE_512 0x2000 +#define PMECC_INDEX_TABLE_SIZE_1024 0x4000 + +#define PMECC_MAX_TIMEOUT_US (100 * 1000) + #endif |