X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fmtd%2Fnand%2Fomap_gpmc.c;h=b540bc3f2740d86e53c1e26c8b44132a2a555f46;hb=bcb9b502d5d7bb88f7623e7185b40bac9a440a58;hp=790d5385e0bdc18ec5172f21735f8232265b46e5;hpb=707acd01ded3c60a4e277f7c5432d397897b4dfd;p=u-boot diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c index 790d5385e0..b540bc3f27 100644 --- a/drivers/mtd/nand/omap_gpmc.c +++ b/drivers/mtd/nand/omap_gpmc.c @@ -7,22 +7,50 @@ #include #include -#include +#include #include -#include -#include +#include #include #include #include #include -#include +#include #define BADBLOCK_MARKER_LENGTH 2 #define SECTOR_BYTES 512 +#define ECCCLEAR (0x1 << 8) +#define ECCRESULTREG1 (0x1 << 0) +/* 4 bit padding to make byte aligned, 56 = 52 + 4 */ +#define BCH4_BIT_PAD 4 -static uint8_t cs; +#ifdef CONFIG_BCH +static u8 bch8_polynomial[] = {0xef, 0x51, 0x2e, 0x09, 0xed, 0x93, 0x9a, 0xc2, + 0x97, 0x79, 0xe5, 0x24, 0xb5}; +#endif +static uint8_t cs_next; static __maybe_unused struct nand_ecclayout omap_ecclayout; +#if defined(CONFIG_NAND_OMAP_GPMC_WSCFG) +static const int8_t wscfg[CONFIG_SYS_MAX_NAND_DEVICE] = + { CONFIG_NAND_OMAP_GPMC_WSCFG }; +#else +/* wscfg is preset to zero since its a static variable */ +static const int8_t wscfg[CONFIG_SYS_MAX_NAND_DEVICE]; +#endif + +/* + * Driver configurations + */ +struct omap_nand_info { + struct bch_control *control; + enum omap_ecc ecc_scheme; + uint8_t cs; + uint8_t ws; /* wait status pin (0,1) */ +}; + +/* We are wasting a bit of memory but al least we are safe */ +static struct omap_nand_info omap_nand_info[GPMC_MAX_CS]; + /* * omap_nand_hwcontrol - Set the address pointers corretly for the * following address/data/command operation @@ -30,7 +58,9 @@ static __maybe_unused struct nand_ecclayout omap_ecclayout; static void omap_nand_hwcontrol(struct mtd_info *mtd, int32_t cmd, uint32_t ctrl) { - register struct nand_chip *this = mtd->priv; + register struct nand_chip *this = mtd_to_nand(mtd); + struct omap_nand_info *info = nand_get_controller_data(this); + int cs = info->cs; /* * Point the IO_ADDR to DATA and ADDRESS registers instead @@ -52,28 +82,12 @@ static void omap_nand_hwcontrol(struct mtd_info *mtd, int32_t cmd, writeb(cmd, this->IO_ADDR_W); } -#ifdef CONFIG_SPL_BUILD /* Check wait pin as dev ready indicator */ -int omap_spl_dev_ready(struct mtd_info *mtd) +static int omap_dev_ready(struct mtd_info *mtd) { - return gpmc_cfg->status & (1 << 8); -} -#endif - -/* - * omap_hwecc_init - Initialize the Hardware ECC for NAND flash in - * GPMC controller - * @mtd: MTD device structure - * - */ -static void __maybe_unused omap_hwecc_init(struct nand_chip *chip) -{ - /* - * Init ECC Control Register - * Clear all ECC | Enable Reg1 - */ - writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control); - writel(ECCSIZE1 | ECCSIZE0 | ECCSIZE0SEL, &gpmc_cfg->ecc_size_config); + register struct nand_chip *this = mtd_to_nand(mtd); + struct omap_nand_info *info = nand_get_controller_data(this); + return gpmc_cfg->status & (1 << (8 + info->ws)); } /* @@ -92,7 +106,7 @@ static uint32_t gen_true_ecc(uint8_t *ecc_buf) /* * omap_correct_data - Compares the ecc read from nand spare area with ECC - * registers values and corrects one bit error if it has occured + * registers values and corrects one bit error if it has occurred * Further details can be had from OMAP TRM and the following selected links: * http://en.wikipedia.org/wiki/Hamming_code * http://www.cs.utexas.edu/users/plaxton/c/337/05f/slides/ErrorCorrection-4.pdf @@ -149,15 +163,93 @@ static int __maybe_unused omap_correct_data(struct mtd_info *mtd, uint8_t *dat, return 0; printf("Error: Bad compare! failed\n"); /* detected 2 bit error */ - return -1; + return -EBADMSG; } } return 0; } /* - * omap_calculate_ecc - Generate non-inverted ECC bytes. - * + * omap_enable_hwecc - configures GPMC as per ECC scheme before read/write + * @mtd: MTD device structure + * @mode: Read/Write mode + */ +__maybe_unused +static void omap_enable_hwecc(struct mtd_info *mtd, int32_t mode) +{ + struct nand_chip *nand = mtd_to_nand(mtd); + struct omap_nand_info *info = nand_get_controller_data(nand); + unsigned int dev_width = (nand->options & NAND_BUSWIDTH_16) ? 1 : 0; + unsigned int ecc_algo = 0; + unsigned int bch_type = 0; + unsigned int eccsize1 = 0x00, eccsize0 = 0x00, bch_wrapmode = 0x00; + u32 ecc_size_config_val = 0; + u32 ecc_config_val = 0; + int cs = info->cs; + + /* configure GPMC for specific ecc-scheme */ + switch (info->ecc_scheme) { + case OMAP_ECC_HAM1_CODE_SW: + return; + case OMAP_ECC_HAM1_CODE_HW: + ecc_algo = 0x0; + bch_type = 0x0; + bch_wrapmode = 0x00; + eccsize0 = 0xFF; + eccsize1 = 0xFF; + break; + case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: + case OMAP_ECC_BCH8_CODE_HW: + ecc_algo = 0x1; + bch_type = 0x1; + if (mode == NAND_ECC_WRITE) { + bch_wrapmode = 0x01; + eccsize0 = 0; /* extra bits in nibbles per sector */ + eccsize1 = 28; /* OOB bits in nibbles per sector */ + } else { + bch_wrapmode = 0x01; + eccsize0 = 26; /* ECC bits in nibbles per sector */ + eccsize1 = 2; /* non-ECC bits in nibbles per sector */ + } + break; + case OMAP_ECC_BCH16_CODE_HW: + ecc_algo = 0x1; + bch_type = 0x2; + if (mode == NAND_ECC_WRITE) { + bch_wrapmode = 0x01; + eccsize0 = 0; /* extra bits in nibbles per sector */ + eccsize1 = 52; /* OOB bits in nibbles per sector */ + } else { + bch_wrapmode = 0x01; + eccsize0 = 52; /* ECC bits in nibbles per sector */ + eccsize1 = 0; /* non-ECC bits in nibbles per sector */ + } + break; + default: + return; + } + /* Clear ecc and enable bits */ + writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control); + /* Configure ecc size for BCH */ + ecc_size_config_val = (eccsize1 << 22) | (eccsize0 << 12); + writel(ecc_size_config_val, &gpmc_cfg->ecc_size_config); + + /* Configure device details for BCH engine */ + ecc_config_val = ((ecc_algo << 16) | /* HAM1 | BCHx */ + (bch_type << 12) | /* BCH4/BCH8/BCH16 */ + (bch_wrapmode << 8) | /* wrap mode */ + (dev_width << 7) | /* bus width */ + (0x0 << 4) | /* number of sectors */ + (cs << 1) | /* ECC CS */ + (0x1)); /* enable ECC */ + writel(ecc_config_val, &gpmc_cfg->ecc_config); +} + +/* + * omap_calculate_ecc - Read ECC result + * @mtd: MTD structure + * @dat: unused + * @ecc_code: ecc_code buffer * Using noninverted ECC can be considered ugly since writing a blank * page ie. padding will clear the ECC bytes. This is no problem as * long nobody is trying to write data on the seemingly unused page. @@ -166,359 +258,229 @@ static int __maybe_unused omap_correct_data(struct mtd_info *mtd, uint8_t *dat, * E.g. if page is 0xFF (fresh erased), and if HW ECC engine within GPMC * is used, the result of read will be 0x0 while the ECC offsets of the * spare area will be 0xFF which will result in an ECC mismatch. - * @mtd: MTD structure - * @dat: unused - * @ecc_code: ecc_code buffer */ -static int __maybe_unused omap_calculate_ecc(struct mtd_info *mtd, - const uint8_t *dat, uint8_t *ecc_code) +static int omap_calculate_ecc(struct mtd_info *mtd, const uint8_t *dat, + uint8_t *ecc_code) { - u_int32_t val; - - /* Start Reading from HW ECC1_Result = 0x200 */ - val = readl(&gpmc_cfg->ecc1_result); - - ecc_code[0] = val & 0xFF; - ecc_code[1] = (val >> 16) & 0xFF; - ecc_code[2] = ((val >> 8) & 0x0F) | ((val >> 20) & 0xF0); - - /* - * Stop reading anymore ECC vals and clear old results - * enable will be called if more reads are required - */ - writel(0x000, &gpmc_cfg->ecc_config); - - return 0; -} + struct nand_chip *chip = mtd_to_nand(mtd); + struct omap_nand_info *info = nand_get_controller_data(chip); + const uint32_t *ptr; + uint32_t val = 0; + int8_t i = 0, j; -/* - * omap_enable_ecc - This function enables the hardware ecc functionality - * @mtd: MTD device structure - * @mode: Read/Write mode - */ -static void __maybe_unused omap_enable_hwecc(struct mtd_info *mtd, int32_t mode) -{ - struct nand_chip *chip = mtd->priv; - uint32_t val, dev_width = (chip->options & NAND_BUSWIDTH_16) >> 1; - - switch (mode) { - case NAND_ECC_READ: - case NAND_ECC_WRITE: - /* Clear the ecc result registers, select ecc reg as 1 */ - writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control); - - /* - * Size 0 = 0xFF, Size1 is 0xFF - both are 512 bytes - * tell all regs to generate size0 sized regs - * we just have a single ECC engine for all CS - */ - writel(ECCSIZE1 | ECCSIZE0 | ECCSIZE0SEL, - &gpmc_cfg->ecc_size_config); - val = (dev_width << 7) | (cs << 1) | (0x1); - writel(val, &gpmc_cfg->ecc_config); + switch (info->ecc_scheme) { + case OMAP_ECC_HAM1_CODE_HW: + val = readl(&gpmc_cfg->ecc1_result); + ecc_code[0] = val & 0xFF; + ecc_code[1] = (val >> 16) & 0xFF; + ecc_code[2] = ((val >> 8) & 0x0F) | ((val >> 20) & 0xF0); + break; +#ifdef CONFIG_BCH + case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: +#endif + case OMAP_ECC_BCH8_CODE_HW: + ptr = &gpmc_cfg->bch_result_0_3[0].bch_result_x[3]; + val = readl(ptr); + ecc_code[i++] = (val >> 0) & 0xFF; + ptr--; + for (j = 0; j < 3; j++) { + val = readl(ptr); + ecc_code[i++] = (val >> 24) & 0xFF; + ecc_code[i++] = (val >> 16) & 0xFF; + ecc_code[i++] = (val >> 8) & 0xFF; + ecc_code[i++] = (val >> 0) & 0xFF; + ptr--; + } + break; + case OMAP_ECC_BCH16_CODE_HW: + val = readl(&gpmc_cfg->bch_result_4_6[0].bch_result_x[2]); + ecc_code[i++] = (val >> 8) & 0xFF; + ecc_code[i++] = (val >> 0) & 0xFF; + val = readl(&gpmc_cfg->bch_result_4_6[0].bch_result_x[1]); + ecc_code[i++] = (val >> 24) & 0xFF; + ecc_code[i++] = (val >> 16) & 0xFF; + ecc_code[i++] = (val >> 8) & 0xFF; + ecc_code[i++] = (val >> 0) & 0xFF; + val = readl(&gpmc_cfg->bch_result_4_6[0].bch_result_x[0]); + ecc_code[i++] = (val >> 24) & 0xFF; + ecc_code[i++] = (val >> 16) & 0xFF; + ecc_code[i++] = (val >> 8) & 0xFF; + ecc_code[i++] = (val >> 0) & 0xFF; + for (j = 3; j >= 0; j--) { + val = readl(&gpmc_cfg->bch_result_0_3[0].bch_result_x[j] + ); + ecc_code[i++] = (val >> 24) & 0xFF; + ecc_code[i++] = (val >> 16) & 0xFF; + ecc_code[i++] = (val >> 8) & 0xFF; + ecc_code[i++] = (val >> 0) & 0xFF; + } break; default: - printf("Error: Unrecognized Mode[%d]!\n", mode); + return -EINVAL; + } + /* ECC scheme specific syndrome customizations */ + switch (info->ecc_scheme) { + case OMAP_ECC_HAM1_CODE_HW: + break; +#ifdef CONFIG_BCH + case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: + + for (i = 0; i < chip->ecc.bytes; i++) + *(ecc_code + i) = *(ecc_code + i) ^ + bch8_polynomial[i]; + break; +#endif + case OMAP_ECC_BCH8_CODE_HW: + ecc_code[chip->ecc.bytes - 1] = 0x00; + break; + case OMAP_ECC_BCH16_CODE_HW: break; + default: + return -EINVAL; } + return 0; } -/* - * Generic BCH interface - */ -struct nand_bch_priv { - uint8_t mode; - uint8_t type; - uint8_t nibbles; - struct bch_control *control; - enum omap_ecc ecc_scheme; -}; - -/* bch types */ -#define ECC_BCH4 0 -#define ECC_BCH8 1 -#define ECC_BCH16 2 +#ifdef CONFIG_NAND_OMAP_GPMC_PREFETCH -/* GPMC ecc engine settings */ -#define BCH_WRAPMODE_1 1 /* BCH wrap mode 1 */ -#define BCH_WRAPMODE_6 6 /* BCH wrap mode 6 */ +#define PREFETCH_CONFIG1_CS_SHIFT 24 +#define PREFETCH_FIFOTHRESHOLD_MAX 0x40 +#define PREFETCH_FIFOTHRESHOLD(val) ((val) << 8) +#define PREFETCH_STATUS_COUNT(val) (val & 0x00003fff) +#define PREFETCH_STATUS_FIFO_CNT(val) ((val >> 24) & 0x7F) +#define ENABLE_PREFETCH (1 << 7) -/* BCH nibbles for diff bch levels */ -#define NAND_ECC_HW_BCH ((uint8_t)(NAND_ECC_HW_OOB_FIRST) + 1) -#define ECC_BCH4_NIBBLES 13 -#define ECC_BCH8_NIBBLES 26 -#define ECC_BCH16_NIBBLES 52 - -/* - * This can be a single instance cause all current users have only one NAND - * with nearly the same setup (BCH8, some with ELM and others with sw BCH - * library). - * When some users with other BCH strength will exists this have to change! - */ -static __maybe_unused struct nand_bch_priv bch_priv = { - .mode = NAND_ECC_HW_BCH, - .type = ECC_BCH8, - .nibbles = ECC_BCH8_NIBBLES, - .control = NULL -}; - -/* - * omap_hwecc_init_bch - Initialize the BCH Hardware ECC for NAND flash in - * GPMC controller - * @mtd: MTD device structure - * @mode: Read/Write mode +/** + * omap_prefetch_enable - configures and starts prefetch transfer + * @fifo_th: fifo threshold to be used for read/ write + * @count: number of bytes to be transferred + * @is_write: prefetch read(0) or write post(1) mode + * @cs: chip select to use */ -__maybe_unused -static void omap_hwecc_init_bch(struct nand_chip *chip, int32_t mode) +static int omap_prefetch_enable(int fifo_th, unsigned int count, int is_write, int cs) { uint32_t val; - uint32_t dev_width = (chip->options & NAND_BUSWIDTH_16) >> 1; - uint32_t unused_length = 0; - uint32_t wr_mode = BCH_WRAPMODE_6; - struct nand_bch_priv *bch = chip->priv; - /* Clear the ecc result registers, select ecc reg as 1 */ - writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control); + if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX) + return -EINVAL; - if (bch->ecc_scheme == OMAP_ECC_BCH8_CODE_HW) { - wr_mode = BCH_WRAPMODE_1; + if (readl(&gpmc_cfg->prefetch_control)) + return -EBUSY; - switch (bch->nibbles) { - case ECC_BCH4_NIBBLES: - unused_length = 3; - break; - case ECC_BCH8_NIBBLES: - unused_length = 2; - break; - case ECC_BCH16_NIBBLES: - unused_length = 0; - break; - } + /* Set the amount of bytes to be prefetched */ + writel(count, &gpmc_cfg->prefetch_config2); - /* - * This is ecc_size_config for ELM mode. Here we are using - * different settings for read and write access and also - * depending on BCH strength. - */ - switch (mode) { - case NAND_ECC_WRITE: - /* write access only setup eccsize1 config */ - val = ((unused_length + bch->nibbles) << 22); - break; + val = (cs << PREFETCH_CONFIG1_CS_SHIFT) | (is_write & 1) | + PREFETCH_FIFOTHRESHOLD(fifo_th) | ENABLE_PREFETCH; + writel(val, &gpmc_cfg->prefetch_config1); - case NAND_ECC_READ: - default: - /* - * by default eccsize0 selected for ecc1resultsize - * eccsize0 config. - */ - val = (bch->nibbles << 12); - /* eccsize1 config */ - val |= (unused_length << 22); - break; - } - } else { - /* - * This ecc_size_config setting is for BCH sw library. - * - * Note: we only support BCH8 currently with BCH sw library! - * Should be really easy to adobt to BCH4, however some omap3 - * have flaws with BCH4. - * - * Here we are using wrapping mode 6 both for reading and - * writing, with: - * size0 = 0 (no additional protected byte in spare area) - * size1 = 32 (skip 32 nibbles = 16 bytes per sector in - * spare area) - */ - val = (32 << 22) | (0 << 12); - } - /* ecc size configuration */ - writel(val, &gpmc_cfg->ecc_size_config); + /* Start the prefetch engine */ + writel(1, &gpmc_cfg->prefetch_control); - /* - * Configure the ecc engine in gpmc - * We assume 512 Byte sector pages for access to NAND. - */ - val = (1 << 16); /* enable BCH mode */ - val |= (bch->type << 12); /* setup BCH type */ - val |= (wr_mode << 8); /* setup wrapping mode */ - val |= (dev_width << 7); /* setup device width (16 or 8 bit) */ - val |= (cs << 1); /* setup chip select to work on */ - debug("set ECC_CONFIG=0x%08x\n", val); - writel(val, &gpmc_cfg->ecc_config); + return 0; } -/* - * omap_enable_ecc_bch - This function enables the bch h/w ecc functionality - * @mtd: MTD device structure - * @mode: Read/Write mode +/** + * omap_prefetch_reset - disables and stops the prefetch engine */ -__maybe_unused -static void omap_enable_ecc_bch(struct mtd_info *mtd, int32_t mode) +static void omap_prefetch_reset(void) { - struct nand_chip *chip = mtd->priv; - - omap_hwecc_init_bch(chip, mode); - /* enable ecc */ - writel((readl(&gpmc_cfg->ecc_config) | 0x1), &gpmc_cfg->ecc_config); + writel(0, &gpmc_cfg->prefetch_control); + writel(0, &gpmc_cfg->prefetch_config1); } -/* - * omap_ecc_disable - Disable H/W ECC calculation - * - * @mtd: MTD device structure - */ -static void __maybe_unused omap_ecc_disable(struct mtd_info *mtd) +static int __read_prefetch_aligned(struct nand_chip *chip, uint32_t *buf, int len) { - writel((readl(&gpmc_cfg->ecc_config) & ~0x1), &gpmc_cfg->ecc_config); -} + int ret; + uint32_t cnt; + struct omap_nand_info *info = nand_get_controller_data(chip); -/* - * BCH support using ELM module - */ -#ifdef CONFIG_NAND_OMAP_ELM -/* - * omap_read_bch8_result - Read BCH result for BCH8 level - * - * @mtd: MTD device structure - * @big_endian: When set read register 3 first - * @ecc_code: Read syndrome from BCH result registers - */ -static void omap_read_bch8_result(struct mtd_info *mtd, uint8_t big_endian, - uint8_t *ecc_code) -{ - uint32_t *ptr; - int8_t i = 0, j; + ret = omap_prefetch_enable(PREFETCH_FIFOTHRESHOLD_MAX, len, 0, info->cs); + if (ret < 0) + return ret; - if (big_endian) { - ptr = &gpmc_cfg->bch_result_0_3[0].bch_result_x[3]; - ecc_code[i++] = readl(ptr) & 0xFF; - ptr--; - for (j = 0; j < 3; j++) { - ecc_code[i++] = (readl(ptr) >> 24) & 0xFF; - ecc_code[i++] = (readl(ptr) >> 16) & 0xFF; - ecc_code[i++] = (readl(ptr) >> 8) & 0xFF; - ecc_code[i++] = readl(ptr) & 0xFF; - ptr--; - } - } else { - ptr = &gpmc_cfg->bch_result_0_3[0].bch_result_x[0]; - for (j = 0; j < 3; j++) { - ecc_code[i++] = readl(ptr) & 0xFF; - ecc_code[i++] = (readl(ptr) >> 8) & 0xFF; - ecc_code[i++] = (readl(ptr) >> 16) & 0xFF; - ecc_code[i++] = (readl(ptr) >> 24) & 0xFF; - ptr++; - } - ecc_code[i++] = readl(ptr) & 0xFF; - ecc_code[i++] = 0; /* 14th byte is always zero */ - } -} + do { + int i; -/* - * omap_rotate_ecc_bch - Rotate the syndrome bytes - * - * @mtd: MTD device structure - * @calc_ecc: ECC read from ECC registers - * @syndrome: Rotated syndrome will be retuned in this array - * - */ -static void omap_rotate_ecc_bch(struct mtd_info *mtd, uint8_t *calc_ecc, - uint8_t *syndrome) -{ - struct nand_chip *chip = mtd->priv; - struct nand_bch_priv *bch = chip->priv; - uint8_t n_bytes = 0; - int8_t i, j; - - switch (bch->type) { - case ECC_BCH4: - n_bytes = 8; - break; + cnt = readl(&gpmc_cfg->prefetch_status); + cnt = PREFETCH_STATUS_FIFO_CNT(cnt); - case ECC_BCH16: - n_bytes = 28; - break; + for (i = 0; i < cnt / 4; i++) { + *buf++ = readl(CONFIG_SYS_NAND_BASE); + len -= 4; + } + } while (len); - case ECC_BCH8: - default: - n_bytes = 13; - break; - } + omap_prefetch_reset(); - for (i = 0, j = (n_bytes-1); i < n_bytes; i++, j--) - syndrome[i] = calc_ecc[j]; + return 0; } -/* - * omap_calculate_ecc_bch - Read BCH ECC result - * - * @mtd: MTD structure - * @dat: unused - * @ecc_code: ecc_code buffer - */ -static int omap_calculate_ecc_bch(struct mtd_info *mtd, const uint8_t *dat, - uint8_t *ecc_code) +static inline void omap_nand_read(struct mtd_info *mtd, uint8_t *buf, int len) { - struct nand_chip *chip = mtd->priv; - struct nand_bch_priv *bch = chip->priv; - uint8_t big_endian = 1; - int8_t ret = 0; + struct nand_chip *chip = mtd_to_nand(mtd); - if (bch->type == ECC_BCH8) - omap_read_bch8_result(mtd, big_endian, ecc_code); - else /* BCH4 and BCH16 currently not supported */ - ret = -1; + if (chip->options & NAND_BUSWIDTH_16) + nand_read_buf16(mtd, buf, len); + else + nand_read_buf(mtd, buf, len); +} + +static void omap_nand_read_prefetch(struct mtd_info *mtd, uint8_t *buf, int len) +{ + int ret; + uint32_t head, tail; + struct nand_chip *chip = mtd_to_nand(mtd); /* - * Stop reading anymore ECC vals and clear old results - * enable will be called if more reads are required + * If the destination buffer is unaligned, start with reading + * the overlap byte-wise. */ - omap_ecc_disable(mtd); + head = ((uint32_t) buf) % 4; + if (head) { + omap_nand_read(mtd, buf, head); + buf += head; + len -= head; + } - return ret; + /* + * Only transfer multiples of 4 bytes in a pre-fetched fashion. + * If there's a residue, care for it byte-wise afterwards. + */ + tail = len % 4; + + ret = __read_prefetch_aligned(chip, (uint32_t *)buf, len - tail); + if (ret < 0) { + /* fallback in case the prefetch engine is busy */ + omap_nand_read(mtd, buf, len); + } else if (tail) { + buf += len - tail; + omap_nand_read(mtd, buf, tail); + } } +#endif /* CONFIG_NAND_OMAP_GPMC_PREFETCH */ +#ifdef CONFIG_NAND_OMAP_ELM /* - * omap_fix_errors_bch - Correct bch error in the data - * - * @mtd: MTD device structure - * @data: Data read from flash - * @error_count:Number of errors in data - * @error_loc: Locations of errors in the data - * - */ -static void omap_fix_errors_bch(struct mtd_info *mtd, uint8_t *data, - uint32_t error_count, uint32_t *error_loc) + * omap_reverse_list - re-orders list elements in reverse order [internal] + * @list: pointer to start of list + * @length: length of list +*/ +static void omap_reverse_list(u8 *list, unsigned int length) { - struct nand_chip *chip = mtd->priv; - struct nand_bch_priv *bch = chip->priv; - uint8_t count = 0; - uint32_t error_byte_pos; - uint32_t error_bit_mask; - uint32_t last_bit = (bch->nibbles * 4) - 1; - - /* Flip all bits as specified by the error location array. */ - /* FOR( each found error location flip the bit ) */ - for (count = 0; count < error_count; count++) { - if (error_loc[count] > last_bit) { - /* Remove the ECC spare bits from correction. */ - error_loc[count] -= (last_bit + 1); - /* Offset bit in data region */ - error_byte_pos = ((512 * 8) - - (error_loc[count]) - 1) / 8; - /* Error Bit mask */ - error_bit_mask = 0x1 << (error_loc[count] % 8); - /* Toggle the error bit to make the correction. */ - data[error_byte_pos] ^= error_bit_mask; - } + unsigned int i, j; + unsigned int half_length = length / 2; + u8 tmp; + for (i = 0, j = length - 1; i < half_length; i++, j--) { + tmp = list[i]; + list[i] = list[j]; + list[j] = tmp; } } /* * omap_correct_data_bch - Compares the ecc read from nand spare area - * with ECC registers values and corrects one bit error if it has occured + * with ECC registers values and corrects one bit error if it has occurred * * @mtd: MTD device structure * @dat: page data @@ -530,42 +492,84 @@ static void omap_fix_errors_bch(struct mtd_info *mtd, uint8_t *data, static int omap_correct_data_bch(struct mtd_info *mtd, uint8_t *dat, uint8_t *read_ecc, uint8_t *calc_ecc) { - struct nand_chip *chip = mtd->priv; - struct nand_bch_priv *bch = chip->priv; - uint8_t syndrome[28]; - uint32_t error_count = 0; - uint32_t error_loc[8]; - uint32_t i, ecc_flag; + struct nand_chip *chip = mtd_to_nand(mtd); + struct omap_nand_info *info = nand_get_controller_data(chip); + struct nand_ecc_ctrl *ecc = &chip->ecc; + uint32_t error_count = 0, error_max; + uint32_t error_loc[ELM_MAX_ERROR_COUNT]; + enum bch_level bch_type; + uint32_t i, ecc_flag = 0; + uint8_t count; + uint32_t byte_pos, bit_pos; + int err = 0; + /* check calculated ecc */ + for (i = 0; i < ecc->bytes && !ecc_flag; i++) { + if (calc_ecc[i] != 0x00) + ecc_flag = 1; + } + if (!ecc_flag) + return 0; + + /* check for whether its a erased-page */ ecc_flag = 0; - for (i = 0; i < chip->ecc.bytes; i++) + for (i = 0; i < ecc->bytes && !ecc_flag; i++) { if (read_ecc[i] != 0xff) ecc_flag = 1; - + } if (!ecc_flag) return 0; - elm_reset(); - elm_config((enum bch_level)(bch->type)); - /* * while reading ECC result we read it in big endian. * Hence while loading to ELM we have rotate to get the right endian. */ - omap_rotate_ecc_bch(mtd, calc_ecc, syndrome); - - /* use elm module to check for errors */ - if (elm_check_error(syndrome, bch->nibbles, &error_count, - error_loc) != 0) { - printf("ECC: uncorrectable.\n"); - return -1; + switch (info->ecc_scheme) { + case OMAP_ECC_BCH8_CODE_HW: + bch_type = BCH_8_BIT; + omap_reverse_list(calc_ecc, ecc->bytes - 1); + break; + case OMAP_ECC_BCH16_CODE_HW: + bch_type = BCH_16_BIT; + omap_reverse_list(calc_ecc, ecc->bytes); + break; + default: + return -EINVAL; } + /* use elm module to check for errors */ + elm_config(bch_type); + err = elm_check_error(calc_ecc, bch_type, &error_count, error_loc); + if (err) + return err; /* correct bch error */ - if (error_count > 0) - omap_fix_errors_bch(mtd, dat, error_count, error_loc); - - return 0; + for (count = 0; count < error_count; count++) { + switch (info->ecc_scheme) { + case OMAP_ECC_BCH8_CODE_HW: + /* 14th byte in ECC is reserved to match ROM layout */ + error_max = SECTOR_BYTES + (ecc->bytes - 1); + break; + case OMAP_ECC_BCH16_CODE_HW: + error_max = SECTOR_BYTES + ecc->bytes; + break; + default: + return -EINVAL; + } + byte_pos = error_max - (error_loc[count] / 8) - 1; + bit_pos = error_loc[count] % 8; + if (byte_pos < SECTOR_BYTES) { + dat[byte_pos] ^= 1 << bit_pos; + debug("nand: bit-flip corrected @data=%d\n", byte_pos); + } else if (byte_pos < error_max) { + read_ecc[byte_pos - SECTOR_BYTES] ^= 1 << bit_pos; + debug("nand: bit-flip corrected @oob=%d\n", byte_pos - + SECTOR_BYTES); + } else { + err = -EBADMSG; + printf("nand: error: invalid bit-flip location\n"); + } + } + return (err) ? err : error_count; } /** @@ -600,11 +604,11 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip, oob += eccbytes) { chip->ecc.hwctl(mtd, NAND_ECC_READ); /* read data */ - chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_pos, page); + chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_pos, -1); chip->read_buf(mtd, p, eccsize); /* read respective ecc from oob area */ - chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, page); + chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1); chip->read_buf(mtd, oob, eccbytes); /* read syndrome */ chip->ecc.calculate(mtd, p, &ecc_calc[i]); @@ -636,57 +640,6 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip, * OMAP3 BCH8 support (with BCH library) */ #ifdef CONFIG_BCH -/* - * omap_calculate_ecc_bch_sw - Read BCH ECC result - * - * @mtd: MTD device structure - * @dat: The pointer to data on which ecc is computed (unused here) - * @ecc: The ECC output buffer - */ -static int omap_calculate_ecc_bch_sw(struct mtd_info *mtd, const uint8_t *dat, - uint8_t *ecc) -{ - int ret = 0; - size_t i; - unsigned long nsectors, val1, val2, val3, val4; - - nsectors = ((readl(&gpmc_cfg->ecc_config) >> 4) & 0x7) + 1; - - for (i = 0; i < nsectors; i++) { - /* Read hw-computed remainder */ - val1 = readl(&gpmc_cfg->bch_result_0_3[i].bch_result_x[0]); - val2 = readl(&gpmc_cfg->bch_result_0_3[i].bch_result_x[1]); - val3 = readl(&gpmc_cfg->bch_result_0_3[i].bch_result_x[2]); - val4 = readl(&gpmc_cfg->bch_result_0_3[i].bch_result_x[3]); - - /* - * Add constant polynomial to remainder, in order to get an ecc - * sequence of 0xFFs for a buffer filled with 0xFFs. - */ - *ecc++ = 0xef ^ (val4 & 0xFF); - *ecc++ = 0x51 ^ ((val3 >> 24) & 0xFF); - *ecc++ = 0x2e ^ ((val3 >> 16) & 0xFF); - *ecc++ = 0x09 ^ ((val3 >> 8) & 0xFF); - *ecc++ = 0xed ^ (val3 & 0xFF); - *ecc++ = 0x93 ^ ((val2 >> 24) & 0xFF); - *ecc++ = 0x9a ^ ((val2 >> 16) & 0xFF); - *ecc++ = 0xc2 ^ ((val2 >> 8) & 0xFF); - *ecc++ = 0x97 ^ (val2 & 0xFF); - *ecc++ = 0x79 ^ ((val1 >> 24) & 0xFF); - *ecc++ = 0xe5 ^ ((val1 >> 16) & 0xFF); - *ecc++ = 0x24 ^ ((val1 >> 8) & 0xFF); - *ecc++ = 0xb5 ^ (val1 & 0xFF); - } - - /* - * Stop reading anymore ECC vals and clear old results - * enable will be called if more reads are required - */ - omap_ecc_disable(mtd); - - return ret; -} - /** * omap_correct_data_bch_sw - Decode received data and correct errors * @mtd: MTD device structure @@ -700,18 +653,18 @@ static int omap_correct_data_bch_sw(struct mtd_info *mtd, u_char *data, int i, count; /* cannot correct more than 8 errors */ unsigned int errloc[8]; - struct nand_chip *chip = mtd->priv; - struct nand_bch_priv *chip_priv = chip->priv; - struct bch_control *bch = chip_priv->control; + struct nand_chip *chip = mtd_to_nand(mtd); + struct omap_nand_info *info = nand_get_controller_data(chip); - count = decode_bch(bch, NULL, 512, read_ecc, calc_ecc, NULL, errloc); + count = decode_bch(info->control, NULL, SECTOR_BYTES, + read_ecc, calc_ecc, NULL, errloc); if (count > 0) { /* correct errors */ for (i = 0; i < count; i++) { /* correct data only, not ecc bytes */ - if (errloc[i] < 8*512) - data[errloc[i]/8] ^= 1 << (errloc[i] & 7); - printf("corrected bitflip %u\n", errloc[i]); + if (errloc[i] < SECTOR_BYTES << 3) + data[errloc[i] >> 3] ^= 1 << (errloc[i] & 7); + debug("corrected bitflip %u\n", errloc[i]); #ifdef DEBUG puts("read_ecc: "); /* @@ -739,16 +692,12 @@ static int omap_correct_data_bch_sw(struct mtd_info *mtd, u_char *data, */ static void __maybe_unused omap_free_bch(struct mtd_info *mtd) { - struct nand_chip *chip = mtd->priv; - struct nand_bch_priv *chip_priv = chip->priv; - struct bch_control *bch = NULL; + struct nand_chip *chip = mtd_to_nand(mtd); + struct omap_nand_info *info = nand_get_controller_data(chip); - if (chip_priv) - bch = chip_priv->control; - - if (bch) { - free_bch(bch); - chip_priv->control = NULL; + if (info->control) { + free_bch(info->control); + info->control = NULL; } } #endif /* CONFIG_BCH */ @@ -762,7 +711,7 @@ static void __maybe_unused omap_free_bch(struct mtd_info *mtd) */ static int omap_select_ecc_scheme(struct nand_chip *nand, enum omap_ecc ecc_scheme, unsigned int pagesize, unsigned int oobsize) { - struct nand_bch_priv *bch = nand->priv; + struct omap_nand_info *info = nand_get_controller_data(nand); struct nand_ecclayout *ecclayout = &omap_ecclayout; int eccsteps = pagesize / SECTOR_BYTES; int i; @@ -772,12 +721,10 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, debug("nand: selected OMAP_ECC_HAM1_CODE_SW\n"); /* For this ecc-scheme, ecc.bytes, ecc.layout, ... are * initialized in nand_scan_tail(), so just set ecc.mode */ - bch_priv.control = NULL; - bch_priv.type = 0; + info->control = NULL; nand->ecc.mode = NAND_ECC_SOFT; nand->ecc.layout = NULL; nand->ecc.size = 0; - bch->ecc_scheme = OMAP_ECC_HAM1_CODE_SW; break; case OMAP_ECC_HAM1_CODE_HW: @@ -788,8 +735,7 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, (3 * eccsteps) + BADBLOCK_MARKER_LENGTH)); return -EINVAL; } - bch_priv.control = NULL; - bch_priv.type = 0; + info->control = NULL; /* populate ecc specific fields */ memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl)); nand->ecc.mode = NAND_ECC_HW; @@ -810,7 +756,6 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH; ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes - BADBLOCK_MARKER_LENGTH; - bch->ecc_scheme = OMAP_ECC_HAM1_CODE_HW; break; case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: @@ -823,21 +768,20 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, return -EINVAL; } /* check if BCH S/W library can be used for error detection */ - bch_priv.control = init_bch(13, 8, 0x201b); - if (!bch_priv.control) { + info->control = init_bch(13, 8, 0x201b); + if (!info->control) { printf("nand: error: could not init_bch()\n"); return -ENODEV; } - bch_priv.type = ECC_BCH8; /* populate ecc specific fields */ memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl)); nand->ecc.mode = NAND_ECC_HW; nand->ecc.strength = 8; nand->ecc.size = SECTOR_BYTES; nand->ecc.bytes = 13; - nand->ecc.hwctl = omap_enable_ecc_bch; + nand->ecc.hwctl = omap_enable_hwecc; nand->ecc.correct = omap_correct_data_bch_sw; - nand->ecc.calculate = omap_calculate_ecc_bch_sw; + nand->ecc.calculate = omap_calculate_ecc; /* define ecc-layout */ ecclayout->eccbytes = nand->ecc.bytes * eccsteps; ecclayout->eccpos[0] = BADBLOCK_MARKER_LENGTH; @@ -852,8 +796,6 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH; ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes - BADBLOCK_MARKER_LENGTH; - omap_hwecc_init_bch(nand, NAND_ECC_READ); - bch->ecc_scheme = OMAP_ECC_BCH8_CODE_HW_DETECTION_SW; break; #else printf("nand: error: CONFIG_BCH required for ECC\n"); @@ -871,16 +813,16 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, } /* intialize ELM for ECC error detection */ elm_init(); - bch_priv.type = ECC_BCH8; + info->control = NULL; /* populate ecc specific fields */ memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl)); nand->ecc.mode = NAND_ECC_HW; nand->ecc.strength = 8; nand->ecc.size = SECTOR_BYTES; nand->ecc.bytes = 14; - nand->ecc.hwctl = omap_enable_ecc_bch; + nand->ecc.hwctl = omap_enable_hwecc; nand->ecc.correct = omap_correct_data_bch; - nand->ecc.calculate = omap_calculate_ecc_bch; + nand->ecc.calculate = omap_calculate_ecc; nand->ecc.read_page = omap_read_page_bch; /* define ecc-layout */ ecclayout->eccbytes = nand->ecc.bytes * eccsteps; @@ -889,13 +831,44 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH; ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes - BADBLOCK_MARKER_LENGTH; - bch->ecc_scheme = OMAP_ECC_BCH8_CODE_HW; break; #else printf("nand: error: CONFIG_NAND_OMAP_ELM required for ECC\n"); return -EINVAL; #endif + case OMAP_ECC_BCH16_CODE_HW: +#ifdef CONFIG_NAND_OMAP_ELM + debug("nand: using OMAP_ECC_BCH16_CODE_HW\n"); + /* check ecc-scheme requirements before updating ecc info */ + if ((26 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) { + printf("nand: error: insufficient OOB: require=%d\n", ( + (26 * eccsteps) + BADBLOCK_MARKER_LENGTH)); + return -EINVAL; + } + /* intialize ELM for ECC error detection */ + elm_init(); + /* populate ecc specific fields */ + nand->ecc.mode = NAND_ECC_HW; + nand->ecc.size = SECTOR_BYTES; + nand->ecc.bytes = 26; + nand->ecc.strength = 16; + nand->ecc.hwctl = omap_enable_hwecc; + nand->ecc.correct = omap_correct_data_bch; + nand->ecc.calculate = omap_calculate_ecc; + nand->ecc.read_page = omap_read_page_bch; + /* define ecc-layout */ + ecclayout->eccbytes = nand->ecc.bytes * eccsteps; + for (i = 0; i < ecclayout->eccbytes; i++) + ecclayout->eccpos[i] = i + BADBLOCK_MARKER_LENGTH; + ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH; + ecclayout->oobfree[0].length = oobsize - nand->ecc.bytes - + BADBLOCK_MARKER_LENGTH; + break; +#else + printf("nand: error: CONFIG_NAND_OMAP_ELM required for ECC\n"); + return -EINVAL; +#endif default: debug("nand: error: ecc scheme not enabled or supported\n"); return -EINVAL; @@ -905,6 +878,7 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, if (ecc_scheme != OMAP_ECC_HAM1_CODE_SW) nand->ecc.layout = ecclayout; + info->ecc_scheme = ecc_scheme; return 0; } @@ -920,19 +894,17 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, int __maybe_unused omap_nand_switch_ecc(uint32_t hardware, uint32_t eccstrength) { struct nand_chip *nand; - struct mtd_info *mtd; + struct mtd_info *mtd = get_nand_dev_by_index(nand_curr_device); int err = 0; - if (nand_curr_device < 0 || - nand_curr_device >= CONFIG_SYS_MAX_NAND_DEVICE || - !nand_info[nand_curr_device].name) { + if (!mtd) { printf("nand: error: no NAND devices found\n"); return -ENODEV; } - mtd = &nand_info[nand_curr_device]; - nand = mtd->priv; + nand = mtd_to_nand(mtd); nand->options |= NAND_OWN_BUFFERS; + nand->options &= ~NAND_SUBPAGE_READ; /* Setup the ecc configurations again */ if (hardware) { if (eccstrength == 1) { @@ -943,13 +915,27 @@ int __maybe_unused omap_nand_switch_ecc(uint32_t hardware, uint32_t eccstrength) err = omap_select_ecc_scheme(nand, OMAP_ECC_BCH8_CODE_HW, mtd->writesize, mtd->oobsize); + } else if (eccstrength == 16) { + err = omap_select_ecc_scheme(nand, + OMAP_ECC_BCH16_CODE_HW, + mtd->writesize, mtd->oobsize); } else { printf("nand: error: unsupported ECC scheme\n"); return -EINVAL; } } else { - err = omap_select_ecc_scheme(nand, OMAP_ECC_HAM1_CODE_SW, + if (eccstrength == 1) { + err = omap_select_ecc_scheme(nand, + OMAP_ECC_HAM1_CODE_SW, mtd->writesize, mtd->oobsize); + } else if (eccstrength == 8) { + err = omap_select_ecc_scheme(nand, + OMAP_ECC_BCH8_CODE_HW_DETECTION_SW, + mtd->writesize, mtd->oobsize); + } else { + printf("nand: error: unsupported ECC scheme\n"); + return -EINVAL; + } } /* Update NAND handling after ECC mode switch */ @@ -977,7 +963,7 @@ int __maybe_unused omap_nand_switch_ecc(uint32_t hardware, uint32_t eccstrength) int board_nand_init(struct nand_chip *nand) { int32_t gpmc_config = 0; - cs = 0; + int cs = cs_next++; int err = 0; /* * xloader/Uboot's gpmc configuration would have configured GPMC for @@ -1007,16 +993,24 @@ int board_nand_init(struct nand_chip *nand) nand->IO_ADDR_R = (void __iomem *)&gpmc_cfg->cs[cs].nand_dat; nand->IO_ADDR_W = (void __iomem *)&gpmc_cfg->cs[cs].nand_cmd; - nand->priv = &bch_priv; + omap_nand_info[cs].control = NULL; + omap_nand_info[cs].cs = cs; + omap_nand_info[cs].ws = wscfg[cs]; + nand_set_controller_data(nand, &omap_nand_info[cs]); nand->cmd_ctrl = omap_nand_hwcontrol; nand->options |= NAND_NO_PADDING | NAND_CACHEPRG; - /* If we are 16 bit dev, our gpmc config tells us that */ - if ((readl(&gpmc_cfg->cs[cs].config1) & 0x3000) == 0x1000) - nand->options |= NAND_BUSWIDTH_16; - nand->chip_delay = 100; nand->ecc.layout = &omap_ecclayout; + /* configure driver and controller based on NAND device bus-width */ + gpmc_config = readl(&gpmc_cfg->cs[cs].config1); +#if defined(CONFIG_SYS_NAND_BUSWIDTH_16BIT) + nand->options |= NAND_BUSWIDTH_16; + writel(gpmc_config | (0x1 << 12), &gpmc_cfg->cs[cs].config1); +#else + nand->options &= ~NAND_BUSWIDTH_16; + writel(gpmc_config & ~(0x1 << 12), &gpmc_cfg->cs[cs].config1); +#endif /* select ECC scheme */ #if defined(CONFIG_NAND_OMAP_ECCSCHEME) err = omap_select_ecc_scheme(nand, CONFIG_NAND_OMAP_ECCSCHEME, @@ -1029,13 +1023,16 @@ int board_nand_init(struct nand_chip *nand) if (err) return err; -#ifdef CONFIG_SPL_BUILD +#ifdef CONFIG_NAND_OMAP_GPMC_PREFETCH + nand->read_buf = omap_nand_read_prefetch; +#else if (nand->options & NAND_BUSWIDTH_16) nand->read_buf = nand_read_buf16; else nand->read_buf = nand_read_buf; - nand->dev_ready = omap_spl_dev_ready; #endif + nand->dev_ready = omap_dev_ready; + return 0; }