diff options
Diffstat (limited to 'roms/u-boot-sam460ex/drivers/mtd/nand/s3c2410_nand.c')
| -rw-r--r-- | roms/u-boot-sam460ex/drivers/mtd/nand/s3c2410_nand.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/roms/u-boot-sam460ex/drivers/mtd/nand/s3c2410_nand.c b/roms/u-boot-sam460ex/drivers/mtd/nand/s3c2410_nand.c new file mode 100644 index 000000000..a27d47e5f --- /dev/null +++ b/roms/u-boot-sam460ex/drivers/mtd/nand/s3c2410_nand.c @@ -0,0 +1,182 @@ +/* + * (C) Copyright 2006 OpenMoko, Inc. + * Author: Harald Welte <laforge@openmoko.org> + * + * 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/arch/s3c24x0_cpu.h> +#include <asm/io.h> + +#define S3C2410_NFCONF_EN (1<<15) +#define S3C2410_NFCONF_512BYTE (1<<14) +#define S3C2410_NFCONF_4STEP (1<<13) +#define S3C2410_NFCONF_INITECC (1<<12) +#define S3C2410_NFCONF_nFCE (1<<11) +#define S3C2410_NFCONF_TACLS(x) ((x)<<8) +#define S3C2410_NFCONF_TWRPH0(x) ((x)<<4) +#define S3C2410_NFCONF_TWRPH1(x) ((x)<<0) + +#define S3C2410_ADDR_NALE 4 +#define S3C2410_ADDR_NCLE 8 + +#ifdef CONFIG_NAND_SPL + +/* in the early stage of NAND flash booting, printf() is not available */ +#define printf(fmt, args...) + +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 s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) +{ + struct nand_chip *chip = mtd->priv; + struct s3c2410_nand *nand = s3c2410_get_base_nand(); + + debugX(1, "hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl); + + if (ctrl & NAND_CTRL_CHANGE) { + ulong IO_ADDR_W = (ulong)nand; + + if (!(ctrl & NAND_CLE)) + IO_ADDR_W |= S3C2410_ADDR_NCLE; + if (!(ctrl & NAND_ALE)) + IO_ADDR_W |= S3C2410_ADDR_NALE; + + chip->IO_ADDR_W = (void *)IO_ADDR_W; + + if (ctrl & NAND_NCE) + writel(readl(&nand->NFCONF) & ~S3C2410_NFCONF_nFCE, + &nand->NFCONF); + else + writel(readl(&nand->NFCONF) | S3C2410_NFCONF_nFCE, + &nand->NFCONF); + } + + if (cmd != NAND_CMD_NONE) + writeb(cmd, chip->IO_ADDR_W); +} + +static int s3c2410_dev_ready(struct mtd_info *mtd) +{ + struct s3c2410_nand *nand = s3c2410_get_base_nand(); + debugX(1, "dev_ready\n"); + return readl(&nand->NFSTAT) & 0x01; +} + +#ifdef CONFIG_S3C2410_NAND_HWECC +void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode) +{ + struct s3c2410_nand *nand = s3c2410_get_base_nand(); + debugX(1, "s3c2410_nand_enable_hwecc(%p, %d)\n", mtd, mode); + writel(readl(&nand->NFCONF) | S3C2410_NFCONF_INITECC, &nand->NFCONF); +} + +static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, + u_char *ecc_code) +{ + struct s3c2410_nand *nand = s3c2410_get_base_nand(); + ecc_code[0] = readb(&nand->NFECC); + ecc_code[1] = readb(&nand->NFECC + 1); + ecc_code[2] = readb(&nand->NFECC + 2); + debugX(1, "s3c2410_nand_calculate_hwecc(%p,): 0x%02x 0x%02x 0x%02x\n", + mtd , ecc_code[0], ecc_code[1], ecc_code[2]); + + return 0; +} + +static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat, + u_char *read_ecc, u_char *calc_ecc) +{ + if (read_ecc[0] == calc_ecc[0] && + read_ecc[1] == calc_ecc[1] && + read_ecc[2] == calc_ecc[2]) + return 0; + + printf("s3c2410_nand_correct_data: not implemented\n"); + return -1; +} +#endif + +int board_nand_init(struct nand_chip *nand) +{ + u_int32_t cfg; + u_int8_t tacls, twrph0, twrph1; + struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power(); + struct s3c2410_nand *nand_reg = s3c2410_get_base_nand(); + + debugX(1, "board_nand_init()\n"); + + writel(readl(&clk_power->CLKCON) | (1 << 4), &clk_power->CLKCON); + + /* initialize hardware */ + twrph0 = 3; + twrph1 = 0; + tacls = 0; + + cfg = S3C2410_NFCONF_EN; + cfg |= S3C2410_NFCONF_TACLS(tacls - 1); + cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1); + cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1); + writel(cfg, &nand_reg->NFCONF); + + /* initialize nand_chip data structure */ + nand->IO_ADDR_R = nand->IO_ADDR_W = (void *)&nand_reg->NFDATA; + + nand->select_chip = NULL; + + /* read_buf and write_buf are default */ + /* read_byte and write_byte are default */ +#ifdef CONFIG_NAND_SPL + nand->read_buf = nand_read_buf; +#endif + + /* hwcontrol always must be implemented */ + nand->cmd_ctrl = s3c2410_hwcontrol; + + nand->dev_ready = s3c2410_dev_ready; + +#ifdef CONFIG_S3C2410_NAND_HWECC + nand->ecc.hwctl = s3c2410_nand_enable_hwecc; + nand->ecc.calculate = s3c2410_nand_calculate_ecc; + nand->ecc.correct = s3c2410_nand_correct_data; + nand->ecc.mode = NAND_ECC_HW; + nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE; + nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES; +#else + nand->ecc.mode = NAND_ECC_SOFT; +#endif + +#ifdef CONFIG_S3C2410_NAND_BBT + nand->options = NAND_USE_FLASH_BBT; +#else + nand->options = 0; +#endif + + debugX(1, "end of nand_init\n"); + + return 0; +} |