| 1 | /* |
| 2 | * Platform independend driver for JZ4740. |
| 3 | * |
| 4 | * Copyright (c) 2007 Ingenic Semiconductor Inc. |
| 5 | * Author: <jlwei@ingenic.cn> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as |
| 9 | * published by the Free Software Foundation; either version 2 of |
| 10 | * the License, or (at your option) any later version. |
| 11 | */ |
| 12 | #include <common.h> |
| 13 | |
| 14 | #if defined(CONFIG_CMD_NAND) |
| 15 | #include <nand.h> |
| 16 | #include <asm/io.h> |
| 17 | #include <asm/jz4740.h> |
| 18 | |
| 19 | #define __nand_ecc_enable() (REG_EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_ERST ) |
| 20 | #define __nand_ecc_disable() (REG_EMC_NFECR &= ~EMC_NFECR_ECCE) |
| 21 | |
| 22 | #define JZ_NAND_DATA_ADDR ((void __iomem *)0xB8000000) |
| 23 | #define JZ_NAND_CMD_ADDR (JZ_NAND_DATA_ADDR + 0x8000) |
| 24 | #define JZ_NAND_ADDR_ADDR (JZ_NAND_DATA_ADDR + 0x10000) |
| 25 | |
| 26 | #define BIT(x) (1 << (x)) |
| 27 | #define JZ_NAND_ECC_CTRL_ENCODING BIT(3) |
| 28 | #define JZ_NAND_ECC_CTRL_RS BIT(2) |
| 29 | #define JZ_NAND_ECC_CTRL_RESET BIT(1) |
| 30 | #define JZ_NAND_ECC_CTRL_ENABLE BIT(0) |
| 31 | |
| 32 | static struct nand_ecclayout qi_lb60_ecclayout_2gb = { |
| 33 | .eccbytes = 72, |
| 34 | .eccpos = { |
| 35 | 12, 13, 14, 15, 16, 17, 18, 19, |
| 36 | 20, 21, 22, 23, 24, 25, 26, 27, |
| 37 | 28, 29, 30, 31, 32, 33, 34, 35, |
| 38 | 36, 37, 38, 39, 40, 41, 42, 43, |
| 39 | 44, 45, 46, 47, 48, 49, 50, 51, |
| 40 | 52, 53, 54, 55, 56, 57, 58, 59, |
| 41 | 60, 61, 62, 63, 64, 65, 66, 67, |
| 42 | 68, 69, 70, 71, 72, 73, 74, 75, |
| 43 | 76, 77, 78, 79, 80, 81, 82, 83}, |
| 44 | .oobfree = { |
| 45 | {.offset = 2, |
| 46 | .length = 10}, |
| 47 | {.offset = 84, |
| 48 | .length = 44}} |
| 49 | }; |
| 50 | |
| 51 | static int is_reading; |
| 52 | |
| 53 | static void jz_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) |
| 54 | { |
| 55 | struct nand_chip *this = mtd->priv; |
| 56 | |
| 57 | if (ctrl & NAND_CTRL_CHANGE) { |
| 58 | if (ctrl & NAND_ALE) |
| 59 | this->IO_ADDR_W = JZ_NAND_ADDR_ADDR; |
| 60 | else if (ctrl & NAND_CLE) |
| 61 | this->IO_ADDR_W = JZ_NAND_CMD_ADDR; |
| 62 | else |
| 63 | this->IO_ADDR_W = JZ_NAND_DATA_ADDR; |
| 64 | |
| 65 | if (ctrl & NAND_NCE) |
| 66 | REG_EMC_NFCSR |= EMC_NFCSR_NFCE1; |
| 67 | else |
| 68 | REG_EMC_NFCSR &= ~EMC_NFCSR_NFCE1; |
| 69 | } |
| 70 | |
| 71 | if (cmd != NAND_CMD_NONE) |
| 72 | writeb(cmd, this->IO_ADDR_W); |
| 73 | } |
| 74 | |
| 75 | static int jz_nand_device_ready(struct mtd_info *mtd) |
| 76 | { |
| 77 | udelay(20); |
| 78 | return (REG_GPIO_PXPIN(2) & 0x40000000) ? 1 : 0; |
| 79 | } |
| 80 | |
| 81 | void board_nand_select_device(struct nand_chip *nand, int chip) |
| 82 | { |
| 83 | /* |
| 84 | * Don't use "chip" to address the NAND device, |
| 85 | * generate the cs from the address where it is encoded. |
| 86 | */ |
| 87 | } |
| 88 | |
| 89 | static int jz_nand_rs_calculate_ecc(struct mtd_info* mtd, const u_char* dat, |
| 90 | u_char* ecc_code) |
| 91 | { |
| 92 | uint32_t reg, status; |
| 93 | int i; |
| 94 | volatile u8 *paraddr = (volatile u8 *)EMC_NFPAR0; |
| 95 | |
| 96 | if(is_reading) |
| 97 | return 0; |
| 98 | |
| 99 | do { |
| 100 | status = REG_EMC_NFINTS; |
| 101 | } while(!(status & EMC_NFINTS_ENCF)); |
| 102 | |
| 103 | __nand_ecc_disable(); |
| 104 | |
| 105 | for(i = 0; i < 9; i++) |
| 106 | ecc_code[i] = *(paraddr + i); |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static void jz_nand_hwctl(struct mtd_info* mtd, int mode) |
| 112 | { |
| 113 | uint32_t reg; |
| 114 | REG_EMC_NFINTS = 0; |
| 115 | reg = REG_EMC_NFECR; |
| 116 | reg |= JZ_NAND_ECC_CTRL_RESET; |
| 117 | reg |= JZ_NAND_ECC_CTRL_ENABLE; |
| 118 | reg |= JZ_NAND_ECC_CTRL_RS; |
| 119 | |
| 120 | switch(mode) { |
| 121 | case NAND_ECC_READ: |
| 122 | reg &= ~JZ_NAND_ECC_CTRL_ENCODING; |
| 123 | is_reading = 1; |
| 124 | break; |
| 125 | case NAND_ECC_WRITE: |
| 126 | reg |= JZ_NAND_ECC_CTRL_ENCODING; |
| 127 | is_reading = 0; |
| 128 | break; |
| 129 | default: |
| 130 | break; |
| 131 | } |
| 132 | |
| 133 | REG_EMC_NFECR = reg; |
| 134 | } |
| 135 | |
| 136 | /* Correct 1~9-bit errors in 512-bytes data */ |
| 137 | static void jz_rs_correct(unsigned char *dat, int idx, int mask) |
| 138 | { |
| 139 | int i; |
| 140 | |
| 141 | idx--; |
| 142 | |
| 143 | i = idx + (idx >> 3); |
| 144 | if (i >= 512) |
| 145 | return; |
| 146 | |
| 147 | mask <<= (idx & 0x7); |
| 148 | |
| 149 | dat[i] ^= mask & 0xff; |
| 150 | if (i < 511) |
| 151 | dat[i+1] ^= (mask >> 8) & 0xff; |
| 152 | } |
| 153 | |
| 154 | static int jz_nand_rs_correct_data(struct mtd_info *mtd, u_char *dat, |
| 155 | u_char *read_ecc, u_char *calc_ecc) |
| 156 | { |
| 157 | int k; |
| 158 | uint32_t reg, status; |
| 159 | volatile u8 *paraddr = (volatile u8 *)EMC_NFPAR0; |
| 160 | |
| 161 | /* Set PAR values */ |
| 162 | static uint8_t all_ff_ecc[] = {0xcd, 0x9d, 0x90, 0x58, 0xf4, 0x8b, 0xff, 0xb7, 0x6f}; |
| 163 | if (read_ecc[0] == 0xff && |
| 164 | read_ecc[1] == 0xff && |
| 165 | read_ecc[2] == 0xff && |
| 166 | read_ecc[3] == 0xff && |
| 167 | read_ecc[4] == 0xff && |
| 168 | read_ecc[5] == 0xff && |
| 169 | read_ecc[6] == 0xff && |
| 170 | read_ecc[7] == 0xff && |
| 171 | read_ecc[8] == 0xff) { |
| 172 | for (k = 0; k < 9; k++) |
| 173 | *(paraddr + k) = all_ff_ecc[k]; |
| 174 | } else { |
| 175 | |
| 176 | for (k = 0; k < 9; k++) |
| 177 | *(paraddr + k) = read_ecc[k]; |
| 178 | } |
| 179 | /* Set PRDY */ |
| 180 | REG_EMC_NFECR |= EMC_NFECR_PRDY; |
| 181 | |
| 182 | /* Wait for completion */ |
| 183 | do { |
| 184 | status = REG_EMC_NFINTS; |
| 185 | } while (!(status & EMC_NFINTS_DECF)); |
| 186 | |
| 187 | __nand_ecc_disable(); |
| 188 | |
| 189 | /* Check decoding */ |
| 190 | if (status & EMC_NFINTS_ERR) { |
| 191 | if (status & EMC_NFINTS_UNCOR) { |
| 192 | printk("uncorrectable ecc\n"); |
| 193 | while(1); |
| 194 | return -1; |
| 195 | } |
| 196 | |
| 197 | uint32_t errcnt = (status & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT; |
| 198 | switch (errcnt) { |
| 199 | case 4: |
| 200 | jz_rs_correct(dat, |
| 201 | (REG_EMC_NFERR3 & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT, |
| 202 | (REG_EMC_NFERR3 & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT); |
| 203 | case 3: |
| 204 | jz_rs_correct(dat, |
| 205 | (REG_EMC_NFERR2 & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT, |
| 206 | (REG_EMC_NFERR2 & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT); |
| 207 | case 2: |
| 208 | jz_rs_correct(dat, |
| 209 | (REG_EMC_NFERR1 & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT, |
| 210 | (REG_EMC_NFERR1 & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT); |
| 211 | case 1: |
| 212 | jz_rs_correct(dat, |
| 213 | (REG_EMC_NFERR0 & EMC_NFERR_INDEX_MASK) >> EMC_NFERR_INDEX_BIT, |
| 214 | (REG_EMC_NFERR0 & EMC_NFERR_MASK_MASK) >> EMC_NFERR_MASK_BIT); |
| 215 | return errcnt; |
| 216 | default: |
| 217 | break; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Main initialization routine |
| 226 | */ |
| 227 | int board_nand_init(struct nand_chip *nand) |
| 228 | { |
| 229 | /* EMC setup, Set NFE bit */ |
| 230 | REG_EMC_NFCSR |= EMC_NFCSR_NFE1; |
| 231 | REG_EMC_SMCR1 = 0x094c4400; |
| 232 | /* REG_EMC_SMCR3 = 0x04444400; */ |
| 233 | |
| 234 | nand->IO_ADDR_R = JZ_NAND_DATA_ADDR; |
| 235 | nand->IO_ADDR_W = JZ_NAND_DATA_ADDR; |
| 236 | nand->cmd_ctrl = jz_nand_cmd_ctrl; |
| 237 | nand->dev_ready = jz_nand_device_ready; |
| 238 | |
| 239 | nand->ecc.hwctl = jz_nand_hwctl; |
| 240 | nand->ecc.correct = jz_nand_rs_correct_data; |
| 241 | nand->ecc.calculate = jz_nand_rs_calculate_ecc; |
| 242 | nand->ecc.mode = NAND_ECC_HW_OOB_FIRST; |
| 243 | nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE; |
| 244 | nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES; |
| 245 | nand->ecc.layout = &qi_lb60_ecclayout_2gb; |
| 246 | nand->chip_delay = 50; |
| 247 | |
| 248 | return 0; |
| 249 | } |
| 250 | #endif /* (CONFIG_CMD_NAND) */ |
| 251 | |
