From: Xiangfu Liu xiangfu@openmobilefree.net
Signed-off-by: Xiangfu Liu xiangfu@openmobilefree.net --- drivers/mtd/nand/jz4740_nand.c | 252 ++++++++++++++++++++++++++++++++++++++++ 1 files changed, 252 insertions(+), 0 deletions(-) create mode 100644 drivers/mtd/nand/jz4740_nand.c
diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c new file mode 100644 index 0000000..390dcbb --- /dev/null +++ b/drivers/mtd/nand/jz4740_nand.c @@ -0,0 +1,252 @@ +/* + * Platform independend driver for JZ4740. + * + * Copyright (c) 2007 Ingenic Semiconductor Inc. + * Author: jlwei@ingenic.cn + * + * 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. + */ +#include <common.h> + +#if defined(CONFIG_CMD_NAND) +#include <nand.h> +#include <asm/io.h> +#include <asm/jz4740.h> + +#define JZ_NAND_DATA_ADDR ((void __iomem *)0xB8000000) +#define JZ_NAND_CMD_ADDR (JZ_NAND_DATA_ADDR + 0x8000) +#define JZ_NAND_ADDR_ADDR (JZ_NAND_DATA_ADDR + 0x10000) + +#define BIT(x) (1 << (x)) +#define JZ_NAND_ECC_CTRL_ENCODING BIT(3) +#define JZ_NAND_ECC_CTRL_RS BIT(2) +#define JZ_NAND_ECC_CTRL_RESET BIT(1) +#define JZ_NAND_ECC_CTRL_ENABLE BIT(0) + +static struct nand_ecclayout qi_lb60_ecclayout_2gb = { + .eccbytes = 72, + .eccpos = { + 12, 13, 14, 15, 16, 17, 18, 19, + 20, 21, 22, 23, 24, 25, 26, 27, + 28, 29, 30, 31, 32, 33, 34, 35, + 36, 37, 38, 39, 40, 41, 42, 43, + 44, 45, 46, 47, 48, 49, 50, 51, + 52, 53, 54, 55, 56, 57, 58, 59, + 60, 61, 62, 63, 64, 65, 66, 67, + 68, 69, 70, 71, 72, 73, 74, 75, + 76, 77, 78, 79, 80, 81, 82, 83}, + .oobfree = { + {.offset = 2, + .length = 10}, + {.offset = 84, + .length = 44}} +}; + +static int is_reading; + +static void jz_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) +{ + struct nand_chip *this = mtd->priv; + + if (ctrl & NAND_CTRL_CHANGE) { + if (ctrl & NAND_ALE) + this->IO_ADDR_W = JZ_NAND_ADDR_ADDR; + else if (ctrl & NAND_CLE) + this->IO_ADDR_W = JZ_NAND_CMD_ADDR; + else + this->IO_ADDR_W = JZ_NAND_DATA_ADDR; + + if (ctrl & NAND_NCE) + writel(readl(EMC_NFCSR) | EMC_NFCSR_NFCE1, EMC_NFCSR); + else + writel(readl(EMC_NFCSR) & ~EMC_NFCSR_NFCE1, EMC_NFCSR); + } + + if (cmd != NAND_CMD_NONE) + writeb(cmd, this->IO_ADDR_W); +} + +static int jz_nand_device_ready(struct mtd_info *mtd) +{ + udelay(20); + return (readl(GPIO_PXPIN(2)) & 0x40000000) ? 1 : 0; +} + +void board_nand_select_device(struct nand_chip *nand, int chip) +{ + /* + * Don't use "chip" to address the NAND device, + * generate the cs from the address where it is encoded. + */ +} + +static int jz_nand_rs_calculate_ecc(struct mtd_info* mtd, const u_char* dat, + u_char* ecc_code) +{ + uint32_t reg, status; + int i; + volatile u8 *paraddr = (volatile u8 *)EMC_NFPAR0; + + if (is_reading) + return 0; + + do { + status = readl(EMC_NFINTS); + } while(!(status & EMC_NFINTS_ENCF)); + + /* disable ecc */ + writel(readl(EMC_NFECR) & ~EMC_NFECR_ECCE, EMC_NFECR); + + for (i = 0; i < 9; i++) + ecc_code[i] = *(paraddr + i); + + return 0; +} + +static void jz_nand_hwctl(struct mtd_info* mtd, int mode) +{ + uint32_t reg; + + writel(0, EMC_NFINTS); + reg = readl(EMC_NFECR); + reg |= JZ_NAND_ECC_CTRL_RESET; + reg |= JZ_NAND_ECC_CTRL_ENABLE; + reg |= JZ_NAND_ECC_CTRL_RS; + + switch (mode) { + case NAND_ECC_READ: + reg &= ~JZ_NAND_ECC_CTRL_ENCODING; + is_reading = 1; + break; + case NAND_ECC_WRITE: + reg |= JZ_NAND_ECC_CTRL_ENCODING; + is_reading = 0; + break; + default: + break; + } + + writel(reg, EMC_NFECR); +} + +/* Correct 1~9-bit errors in 512-bytes data */ +static void jz_rs_correct(unsigned char *dat, int idx, int mask) +{ + int i; + + idx--; + + i = idx + (idx >> 3); + if (i >= 512) + return; + + mask <<= (idx & 0x7); + + dat[i] ^= mask & 0xff; + if (i < 511) + dat[i+1] ^= (mask >> 8) & 0xff; +} + +static int jz_nand_rs_correct_data(struct mtd_info *mtd, u_char *dat, + u_char *read_ecc, u_char *calc_ecc) +{ + int k; + uint32_t reg, status; + volatile u8 *paraddr = (volatile u8 *)EMC_NFPAR0; + + /* Set PAR values */ + static uint8_t all_ff_ecc[] = {0xcd, 0x9d, 0x90, 0x58, 0xf4, 0x8b, 0xff, 0xb7, 0x6f}; + if (read_ecc[0] == 0xff && + read_ecc[1] == 0xff && + read_ecc[2] == 0xff && + read_ecc[3] == 0xff && + read_ecc[4] == 0xff && + read_ecc[5] == 0xff && + read_ecc[6] == 0xff && + read_ecc[7] == 0xff && + read_ecc[8] == 0xff) { + for (k = 0; k < 9; k++) + *(paraddr + k) = all_ff_ecc[k]; + } else { + for (k = 0; k < 9; k++) + *(paraddr + k) = read_ecc[k]; + } + /* Set PRDY */ + writel(readl(EMC_NFECR) | EMC_NFECR_PRDY, EMC_NFECR); + + /* Wait for completion */ + do { + status = readl(EMC_NFINTS); + } while (!(status & EMC_NFINTS_DECF)); + + /* disable ecc */ + writel(readl(EMC_NFECR) & ~EMC_NFECR_ECCE, EMC_NFECR); + + /* Check decoding */ + if (status & EMC_NFINTS_ERR) { + if (status & EMC_NFINTS_UNCOR) { + printk("uncorrectable ecc\n"); + return -1; + } + + uint32_t errcnt = (status & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT; + switch (errcnt) { + case 4: + jz_rs_correct(dat, + (readl(EMC_NFERR3) & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT, + (readl(EMC_NFERR3) & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT); + case 3: + jz_rs_correct(dat, + (readl(EMC_NFERR2) & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT, + (readl(EMC_NFERR2) & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT); + case 2: + jz_rs_correct(dat, + (readl(EMC_NFERR1) & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT, + (readl(EMC_NFERR1) & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT); + case 1: + jz_rs_correct(dat, + (readl(EMC_NFERR0) & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT, + (readl(EMC_NFERR0) & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT); + return errcnt; + default: + break; + } + } + + return 0; +} + +/* + * Main initialization routine + */ +int board_nand_init(struct nand_chip *nand) +{ + uint32_t reg; + + reg = readl(EMC_NFCSR); + reg |= EMC_NFCSR_NFE1; /* EMC setup, Set NFE bit */ + writel(reg, EMC_NFCSR); + + writel(0x094c4400, EMC_SMCR1); + + nand->IO_ADDR_R = JZ_NAND_DATA_ADDR; + nand->IO_ADDR_W = JZ_NAND_DATA_ADDR; + nand->cmd_ctrl = jz_nand_cmd_ctrl; + nand->dev_ready = jz_nand_device_ready; + + nand->ecc.hwctl = jz_nand_hwctl; + nand->ecc.correct = jz_nand_rs_correct_data; + nand->ecc.calculate = jz_nand_rs_calculate_ecc; + nand->ecc.mode = NAND_ECC_HW_OOB_FIRST; + nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE; + nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES; + nand->ecc.layout = &qi_lb60_ecclayout_2gb; + nand->chip_delay = 50; + + return 0; +} + +#endif /* (CONFIG_CMD_NAND) */