diff options
Diffstat (limited to 'cpu/arm920t/s3c24x0/nand.c')
| -rw-r--r-- | cpu/arm920t/s3c24x0/nand.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/cpu/arm920t/s3c24x0/nand.c b/cpu/arm920t/s3c24x0/nand.c new file mode 100644 index 0000000..e1bf128 --- /dev/null +++ b/cpu/arm920t/s3c24x0/nand.c @@ -0,0 +1,179 @@ +/* + * (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> + +#if 0 +#define DEBUGN printf +#else +#define DEBUGN(x, args ...) {} +#endif + +#if defined(CONFIG_CMD_NAND) +#if !defined(CFG_NAND_LEGACY) + +#include <nand.h> +#include <s3c2410.h> + +#define __REGb(x) (*(volatile unsigned char *)(x)) +#define __REGi(x) (*(volatile unsigned int *)(x)) + +#define NF_BASE 0x4e000000 +#define NFCONF __REGi(NF_BASE + 0x0) +#define NFCMD __REGb(NF_BASE + 0x4) +#define NFADDR __REGb(NF_BASE + 0x8) +#define NFDATA __REGb(NF_BASE + 0xc) +#define NFSTAT __REGb(NF_BASE + 0x10) +#define NFECC0 __REGb(NF_BASE + 0x14) +#define NFECC1 __REGb(NF_BASE + 0x15) +#define NFECC2 __REGb(NF_BASE + 0x16) + +#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) + +static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd) +{ + struct nand_chip *chip = mtd->priv; + + DEBUGN("hwcontrol(): 0x%02x: ", cmd); + + switch (cmd) { + case NAND_CTL_SETNCE: + NFCONF &= ~S3C2410_NFCONF_nFCE; + DEBUGN("NFCONF=0x%08x\n", NFCONF); + break; + case NAND_CTL_CLRNCE: + NFCONF |= S3C2410_NFCONF_nFCE; + DEBUGN("NFCONF=0x%08x\n", NFCONF); + break; + case NAND_CTL_SETALE: + chip->IO_ADDR_W = NF_BASE + 0x8; + DEBUGN("SETALE\n"); + break; + case NAND_CTL_SETCLE: + chip->IO_ADDR_W = NF_BASE + 0x4; + DEBUGN("SETCLE\n"); + break; + default: + chip->IO_ADDR_W = NF_BASE + 0xc; + break; + } + return; +} + +static int s3c2410_dev_ready(struct mtd_info *mtd) +{ + DEBUGN("dev_ready\n"); + return (NFSTAT & 0x01); +} + +#ifdef CONFIG_S3C2410_NAND_HWECC +void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode) +{ + DEBUGN("s3c2410_nand_enable_hwecc(%p, %d)\n", mtd ,mode); + NFCONF |= S3C2410_NFCONF_INITECC; +} + +static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, + u_char *ecc_code) +{ + ecc_code[0] = NFECC0; + ecc_code[1] = NFECC1; + ecc_code[2] = NFECC2; + DEBUGN("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; + S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER(); + + DEBUGN("board_nand_init()\n"); + + clk_power->CLKCON |= (1 << 4); + + /* 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); + + NFCONF = cfg; + + /* initialize nand_chip data structure */ + nand->IO_ADDR_R = nand->IO_ADDR_W = 0x4e00000c; + + /* read_buf and write_buf are default */ + /* read_byte and write_byte are default */ + + /* hwcontrol always must be implemented */ + nand->hwcontrol = s3c2410_hwcontrol; + + nand->dev_ready = s3c2410_dev_ready; + +#ifdef CONFIG_S3C2410_NAND_HWECC + nand->enable_hwecc = s3c2410_nand_enable_hwecc; + nand->calculate_ecc = s3c2410_nand_calculate_ecc; + nand->correct_data = s3c2410_nand_correct_data; + nand->eccmode = NAND_ECC_HW3_512; +#else + nand->eccmode = NAND_ECC_SOFT; +#endif + +#ifdef CONFIG_S3C2410_NAND_BBT + nand->options = NAND_USE_FLASH_BBT; +#else + nand->options = 0; +#endif + + DEBUGN("end of nand_init\n"); + + return 0; +} + +#else + #error "U-Boot legacy NAND support not available for S3C2410" +#endif +#endif |