Ported from u-boot-1.1.6 driver by Samsung.
Signed-off-by: Guennadi Liakhovetski lg@denx.de --- drivers/mtd/nand/Makefile | 1 + drivers/mtd/nand/s3c64xx.c | 373 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 374 insertions(+), 0 deletions(-) create mode 100644 drivers/mtd/nand/s3c64xx.c
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile index 7bd22a0..236cf03 100644 --- a/drivers/mtd/nand/Makefile +++ b/drivers/mtd/nand/Makefile @@ -33,6 +33,7 @@ COBJS-y += nand_bbt.o COBJS-y += nand_util.o
COBJS-y += fsl_upm.o +COBJS-$(CONFIG_NAND_S3C64XX) += s3c64xx.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/mtd/nand/s3c64xx.c b/drivers/mtd/nand/s3c64xx.c new file mode 100644 index 0000000..49d3440 --- /dev/null +++ b/drivers/mtd/nand/s3c64xx.c @@ -0,0 +1,315 @@ +/* + * (C) Copyright 2006 DENX Software Engineering + * + * 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 <s3c6400.h> + +#include <asm/io.h> + +#ifdef CONFIG_NAND_SPL +#define printf(arg...) do {} while (0) +#endif + +/* Nand flash definition values by jsgood */ +#define S3C_NAND_CFG_HWECC +#undef S3C_NAND_DEBUG + +#ifdef S3C_NAND_DEBUG +/* + * Function to print out oob buffer for debugging + * Written by jsgood + */ +static void print_oob(const char *header, struct mtd_info *mtd) +{ + int i; + struct nand_chip *chip = mtd->priv; + + printf("%s:\t", header); + + for(i = 0; i < 64; i++) + printf("%02x ", chip->oob_poi[i]); + + printf("\n"); +} +#endif /* S3C_NAND_DEBUG */ + +#ifdef CONFIG_NAND_SPL +static u_char nand_read_byte(struct mtd_info *mtd) +{ + struct nand_chip *this = mtd->priv; + return readb(this->IO_ADDR_R); +} + +static void nand_write_byte(struct mtd_info *mtd, u_char byte) +{ + struct nand_chip *this = mtd->priv; + writeb(byte, this->IO_ADDR_W); +} + +static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) +{ + int i; + struct nand_chip *this = mtd->priv; + + for (i = 0; i < len; i++) + buf[i] = readb(this->IO_ADDR_R); +} +#endif + +static void s3c_nand_select_chip(struct mtd_info *mtd, int chip) +{ + int ctrl = readl(NFCONT); + + switch (chip) { + case -1: + ctrl |= 6; + break; + case 0: + ctrl &= ~2; + break; + case 1: + ctrl &= ~4; + break; + default: + return; + } + + writel(ctrl, NFCONT); +} + +/* + * Hardware specific access to control-lines function + * Written by jsgood + */ +static void s3c_nand_hwcontrol(struct mtd_info *mtd, int cmd) +{ + struct nand_chip *this = mtd->priv; + + switch (cmd) { + case NAND_CTL_SETCLE: + this->IO_ADDR_W = (void __iomem *)NFCMMD; + break; + case NAND_CTL_CLRCLE: + this->IO_ADDR_W = (void __iomem *)NFDATA; + break; + case NAND_CTL_SETALE: + this->IO_ADDR_W = (void __iomem *)NFADDR; + break; + case NAND_CTL_CLRALE: + this->IO_ADDR_W = (void __iomem *)NFDATA; + break; + case NAND_CTL_SETNCE: + s3c_nand_select_chip(mtd, 0); + break; + case NAND_CTL_CLRNCE: + s3c_nand_select_chip(mtd, -1); + break; + } +} + +/* + * Function for checking device ready pin + * Written by jsgood + */ +static int s3c_nand_device_ready(struct mtd_info *mtdinfo) +{ + while (!(readl(NFSTAT) & NFSTAT_RnB)) {} + return 1; +} + +#ifdef S3C_NAND_CFG_HWECC +/* + * This function is called before encoding ecc codes to ready ecc engine. + * Written by jsgood + */ +static void s3c_nand_enable_hwecc(struct mtd_info *mtd, int mode) +{ + u_long nfcont, nfconf; + + /* + * The original driver used 4-bit ECC for "new" MLC chips, i.e., for + * those with non-zero ID[3][3:2], which anyway only holds for ST + * (Numonyx) chips + */ + nfconf = readl(NFCONF) & ~NFCONF_ECC_4BIT; + + writel(nfconf, NFCONF); + + /* Initialize & unlock */ + nfcont = readl(NFCONT); + nfcont |= NFCONT_INITECC; + nfcont &= ~NFCONT_MECCLOCK; + + if (mode == NAND_ECC_WRITE) + nfcont |= NFCONT_ECC_ENC; + else if (mode == NAND_ECC_READ) + nfcont &= ~NFCONT_ECC_ENC; + + writel(nfcont, NFCONT); +} + +/* + * This function is called immediately after encoding ecc codes. + * This function returns encoded ecc codes. + * Written by jsgood + */ +static int s3c_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, + u_char *ecc_code) +{ + u_long nfcont, nfmecc0; + + /* Lock */ + nfcont = readl(NFCONT); + nfcont |= NFCONT_MECCLOCK; + writel(nfcont, NFCONT); + + nfmecc0 = readl(NFMECC0); + + 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. + * If SLC, must write ecc codes to controller before reading status bit. + * If MLC, status bit is already set, so only reading is needed. + * If status bit is good, return 0. + * If correctable errors occured, do that. + * If uncorrectable errors occured, return -1. + * Written by jsgood + */ +static int s3c_nand_correct_data(struct mtd_info *mtd, u_char *dat, + u_char *read_ecc, u_char *calc_ecc) +{ + int ret = -1; + u_long nfestat0, nfmeccdata0, nfmeccdata1; + u_char err_type; + + /* SLC: Write ecc to compare */ + nfmeccdata0 = (calc_ecc[1] << 16) | calc_ecc[0]; + nfmeccdata1 = (calc_ecc[3] << 16) | calc_ecc[2]; + writel(nfmeccdata0, NFMECCDATA0); + writel(nfmeccdata1, NFMECCDATA1); + + /* Read ecc status */ + nfestat0 = readl(NFESTAT0); + err_type = nfestat0 & 0x3; + + switch (err_type) { + case 0: /* No error */ + ret = 0; + break; + + case 1: /* 1 bit error (Correctable) + (nfestat0 >> 7) & 0x7ff :error byte number + (nfestat0 >> 4) & 0x7 :error bit number */ + printf("S3C NAND: 1 bit error detected at byte %ld. Correcting from " + "0x%02x ", (nfestat0 >> 7) & 0x7ff, dat[(nfestat0 >> 7) & 0x7ff]); + dat[(nfestat0 >> 7) & 0x7ff] ^= (1 << ((nfestat0 >> 4) & 0x7)); + printf("to 0x%02x...OK\n", dat[(nfestat0 >> 7) & 0x7ff]); + ret = 1; + break; + + case 2: /* Multiple error */ + case 3: /* ECC area error */ + printf("S3C NAND: ECC uncorrectable error detected. Not correctable.\n"); + ret = -1; + break; + } + + return ret; +} +#endif /* S3C_NAND_CFG_HWECC */ + +/* + * Board-specific NAND initialization. The following members of the + * argument are board-specific (per include/linux/mtd/nand.h): + * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device + * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device + * - hwcontrol: hardwarespecific function for accesing control-lines + * - dev_ready: hardwarespecific function for accesing device ready/busy line + * - enable_hwecc?: function to enable (reset) hardware ecc generator. Must + * only be provided if a hardware ECC is available + * - eccmode: mode of ecc, see defines + * - chip_delay: chip dependent delay for transfering data from array to + * read regs (tR) + * - options: various chip options. They can partly be set to inform + * nand_scan about special functionality. See the defines for further + * explanation + * Members with a "?" were not set in the merged testing-NAND branch, + * so they are not set here either. + */ +#include <linux/mtd/mtd.h> +int board_nand_init(struct nand_chip *nand) +{ + NFCONT_REG = (NFCONT_REG & ~NFCONT_WP) | NFCONT_ENABLE | 0x6; + + nand->IO_ADDR_R = (void __iomem *)NFDATA; + nand->IO_ADDR_W = (void __iomem *)NFDATA; + nand->hwcontrol = s3c_nand_hwcontrol; + nand->dev_ready = s3c_nand_device_ready; + nand->select_chip = s3c_nand_select_chip; + nand->options = 0; +#ifdef CONFIG_NAND_SPL + nand->read_byte = nand_read_byte; + nand->write_byte = nand_write_byte; + nand->read_buf = nand_read_buf; +#endif + + do { + struct mtd_info m; + int cellinfo; + + m.priv = nand; + + s3c_nand_select_chip(&m, 0); + s3c_nand_hwcontrol(&m, NAND_CTL_SETCLE); + writeb(NAND_CMD_READID, nand->IO_ADDR_W); + s3c_nand_hwcontrol(&m, NAND_CTL_CLRCLE); + s3c_nand_device_ready(&m); + cellinfo = readb(nand->IO_ADDR_R); + cellinfo += readb(nand->IO_ADDR_R); + cellinfo += readb(nand->IO_ADDR_R); + s3c_nand_select_chip(&m, -1); + nand->eccmode = cellinfo; + } while (0); + +#ifdef S3C_NAND_CFG_HWECC + nand->enable_hwecc = s3c_nand_enable_hwecc; + nand->calculate_ecc = s3c_nand_calculate_ecc; + nand->correct_data = s3c_nand_correct_data; + + /* A shot in the dark, I don't know how to use this smart ECC-mode + * selection with the current driver */ + nand->eccmode = NAND_ECC_HW12_2048; +#else + nand->eccmode = NAND_ECC_SOFT; +#endif /* ! S3C_NAND_CFG_HWECC */ + + return 0; +}