NAND Flash driver with HW ECC for the S3C24XX SoCs. Currently it only supports SLC NAND chips.
Signed-off-by: José Miguel Gonçalves jose.goncalves@inov.pt --- Changes for v2: - Coding style cleanup - Use of clrsetbits_le32() - Use of register bit macros instead of magic numbers --- drivers/mtd/nand/Makefile | 1 + drivers/mtd/nand/s3c24xx_nand.c | 245 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 246 insertions(+) create mode 100644 drivers/mtd/nand/s3c24xx_nand.c
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile index 29dc20e..791ec44 100644 --- a/drivers/mtd/nand/Makefile +++ b/drivers/mtd/nand/Makefile @@ -60,6 +60,7 @@ COBJS-$(CONFIG_NAND_MXS) += mxs_nand.o COBJS-$(CONFIG_NAND_NDFC) += ndfc.o COBJS-$(CONFIG_NAND_NOMADIK) += nomadik.o COBJS-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o +COBJS-$(CONFIG_NAND_S3C24XX) += s3c24xx_nand.o COBJS-$(CONFIG_NAND_S3C64XX) += s3c64xx.o COBJS-$(CONFIG_NAND_SPEAR) += spr_nand.o COBJS-$(CONFIG_NAND_OMAP_GPMC) += omap_gpmc.o diff --git a/drivers/mtd/nand/s3c24xx_nand.c b/drivers/mtd/nand/s3c24xx_nand.c new file mode 100644 index 0000000..9c0f6e2 --- /dev/null +++ b/drivers/mtd/nand/s3c24xx_nand.c @@ -0,0 +1,245 @@ +/* + * (C) Copyright 2012 INOV - INESC Inovacao + * Jose Goncalves jose.goncalves@inov.pt + * + * Based on drivers/mtd/nand/s3c64xx.c and U-Boot 1.3.4 from Samsung. + * Supports only SLC NAND Flash chips. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <nand.h> +#include <asm/io.h> +#include <asm/arch/s3c24xx_cpu.h> +#include <asm/errno.h> + +#define MAX_CHIPS 2 +static int nand_cs[MAX_CHIPS] = { 0, 1 }; + +#ifdef CONFIG_SPL_BUILD +#define printf(arg...) do {} while (0) +#endif + +static void s3c_nand_select_chip(struct mtd_info *mtd, int chip) +{ + struct s3c24xx_nand *const nand = s3c24xx_get_base_nand(); + u_long nfcont; + + nfcont = readl(&nand->nfcont); + + switch (chip) { + case -1: + nfcont |= NFCONT_NCE1 | NFCONT_NCE0; + break; + case 0: + nfcont &= ~NFCONT_NCE0; + break; + case 1: + nfcont &= ~NFCONT_NCE1; + break; + default: + return; + } + + writel(nfcont, &nand->nfcont); +} + +/* + * Hardware specific access to control-lines function + */ +static void s3c_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) +{ + struct s3c24xx_nand *const nand = s3c24xx_get_base_nand(); + struct nand_chip *this = mtd->priv; + + if (ctrl & NAND_CTRL_CHANGE) { + if (ctrl & NAND_CLE) + this->IO_ADDR_W = &nand->nfcmmd; + else if (ctrl & NAND_ALE) + this->IO_ADDR_W = &nand->nfaddr; + else + this->IO_ADDR_W = &nand->nfdata; + if (ctrl & NAND_NCE) + s3c_nand_select_chip(mtd, *(int *)this->priv); + else + s3c_nand_select_chip(mtd, -1); + } + + if (cmd != NAND_CMD_NONE) + writeb(cmd, this->IO_ADDR_W); +} + +/* + * Function for checking device ready pin + */ +static int s3c_nand_device_ready(struct mtd_info *mtdinfo) +{ + struct s3c24xx_nand *const nand = s3c24xx_get_base_nand(); + + return readl(&nand->nfstat) & NFSTAT_RNB; +} + +#ifdef CONFIG_S3C24XX_NAND_HWECC +/* + * This function is called before encoding ECC codes to ready ECC engine. + */ +static void s3c_nand_enable_hwecc(struct mtd_info *mtd, int mode) +{ + struct s3c24xx_nand *const nand = s3c24xx_get_base_nand(); + + /* Set 1-bit ECC */ + clrsetbits_le32(&nand->nfconf, NFCONF_ECCTYPE_MASK, + NFCONF_ECCTYPE_1BIT); + + /* Initialize & unlock ECC */ + clrsetbits_le32(&nand->nfcont, NFCONT_MECCLOCK, NFCONT_INITMECC); +} + +/* + * This function is called immediately after encoding ECC codes. + * This function returns encoded ECC codes. + */ +static int s3c_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, + u_char *ecc_code) +{ + struct s3c24xx_nand *const nand = s3c24xx_get_base_nand(); + u_long nfmecc0; + + /* Lock ECC */ + setbits_le32(&nand->nfcont, NFCONT_MECCLOCK); + + /* Return 1-bit ECC */ + nfmecc0 = readl(&nand->nfmecc[0]); + + ecc_code[0] = nfmecc0 & 0xff; + ecc_code[1] = (nfmecc0 >> 8) & 0xff; + ecc_code[2] = (nfmecc0 >> 16) & 0xff; + ecc_code[3] = (nfmecc0 >> 24) & 0xff; + + return 0; +} + +/* + * This function determines whether read data is good or not. + * On SLC, must write ECC codes to controller before reading status bit. + * If status bit is good, return 0. + * If a correctable error occured, correct it and return 1. + * If an uncorrectable error occured, return -1. + */ +static int s3c_nand_correct_data(struct mtd_info *mtd, u_char *dat, + u_char *read_ecc, u_char *calc_ecc) +{ + struct s3c24xx_nand *const nand = s3c24xx_get_base_nand(); + int ret; + u_long nfeccerr0, nfmeccdata0, nfmeccdata1, err_byte_addr; + u_char err_type, repaired; + + /* SLC: Write ECC to compare */ + nfmeccdata0 = (((u_long) read_ecc[1]) << 16) | read_ecc[0]; + nfmeccdata1 = (((u_long) read_ecc[3]) << 16) | read_ecc[2]; + writel(nfmeccdata0, &nand->nfmeccd[0]); + writel(nfmeccdata1, &nand->nfmeccd[1]); + + /* Read ECC status */ + nfeccerr0 = readl(&nand->nfeccerr[0]); + err_type = nfeccerr0 & 0x3; + + switch (err_type) { + case 0: /* No error */ + ret = 0; + break; + + case 1: + /* + * 1 bit error (Correctable) + * (nfeccerr0 >> 7) & 0x7ff :error byte number + * (nfeccerr0 >> 4) & 0x7 :error bit number + */ + err_byte_addr = (nfeccerr0 >> 7) & 0x7ff; + repaired = dat[err_byte_addr] ^ (1 << ((nfeccerr0 >> 4) & 0x7)); + + printf("S3C24XX NAND: 1 bit error detected at byte %ld. " + "Correcting from 0x%02x to 0x%02x\n", + err_byte_addr, dat[err_byte_addr], repaired); + + dat[err_byte_addr] = repaired; + + ret = 1; + break; + + case 2: /* Multiple error */ + case 3: /* ECC area error */ + printf("S3C24XX NAND: ECC uncorrectable error detected.\n"); + ret = -1; + break; + } + + return ret; +} +#endif /* CONFIG_S3C24XX_NAND_HWECC */ + +/* + * Board-specific NAND initialization. + */ +int board_nand_init(struct nand_chip *nand) +{ + static int chip_n; + struct s3c24xx_nand *const nand_reg = s3c24xx_get_base_nand(); + + if (chip_n == 0) { + /* Extend NAND timings to the maximum */ + clrsetbits_le32(&nand_reg->nfconf, + NFCONF_TACLS_MASK | NFCONF_TWRPH0_MASK | + NFCONF_TWRPH1_MASK, + NFCONF_TACLS(7) | NFCONF_TWRPH0(7) | + NFCONF_TWRPH1(7)); + + /* Disable chip selects and soft lock, enable controller */ + clrsetbits_le32(&nand_reg->nfcont, NFCONT_WP, + NFCONT_NCE1 | NFCONT_NCE0 | NFCONT_ENABLE); + } else if (chip_n >= MAX_CHIPS) { + return -ENODEV; + } + + nand->IO_ADDR_R = &nand_reg->nfdata; + nand->IO_ADDR_W = &nand_reg->nfdata; + nand->cmd_ctrl = s3c_nand_hwcontrol; + nand->dev_ready = s3c_nand_device_ready; + nand->select_chip = s3c_nand_select_chip; + nand->options = 0; +#ifdef CONFIG_SPL_BUILD + nand->read_buf = nand_read_buf; +#endif + +#ifdef CONFIG_S3C24XX_NAND_HWECC + nand->ecc.hwctl = s3c_nand_enable_hwecc; + nand->ecc.calculate = s3c_nand_calculate_ecc; + nand->ecc.correct = s3c_nand_correct_data; + nand->ecc.mode = NAND_ECC_HW_OOB_FIRST; + nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE; + nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES; +#else + nand->ecc.mode = NAND_ECC_SOFT; +#endif /* ! CONFIG_S3C24XX_NAND_HWECC */ + + nand->priv = nand_cs + chip_n++; + + return 0; +}