drivers/mtd/nand/jz4740_nand.c

   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 #include <nand.h>
  15 #include <asm/io.h>
  16 #include <asm/jz4740.h>
  17
  18 #define JZ_NAND_DATA_ADDR ((void __iomem *)0xB8000000)
  19 #define JZ_NAND_CMD_ADDR (JZ_NAND_DATA_ADDR + 0x8000)
  20 #define JZ_NAND_ADDR_ADDR (JZ_NAND_DATA_ADDR + 0x10000)
  21
  22 #define BIT(x) (1 << (x))
  23 #define JZ_NAND_ECC_CTRL_ENCODING       BIT(3)
  24 #define JZ_NAND_ECC_CTRL_RS             BIT(2)
  25 #define JZ_NAND_ECC_CTRL_RESET          BIT(1)
  26 #define JZ_NAND_ECC_CTRL_ENABLE         BIT(0)
  27
  28 #define EMC_SMCR1_OPT_NAND      0x094c4400
  29 /* Optimize the timing of nand */
  30
  31 static struct jz4740_emc * emc = (struct jz4740_emc *)JZ4740_EMC_BASE;
  32
  33 static struct nand_ecclayout qi_lb60_ecclayout_2gb = {
  34         .eccbytes = 72,
  35         .eccpos = {
  36                 12, 13, 14, 15, 16, 17, 18, 19,
  37                 20, 21, 22, 23, 24, 25, 26, 27,
  38                 28, 29, 30, 31, 32, 33, 34, 35,
  39                 36, 37, 38, 39, 40, 41, 42, 43,
  40                 44, 45, 46, 47, 48, 49, 50, 51,
  41                 52, 53, 54, 55, 56, 57, 58, 59,
  42                 60, 61, 62, 63, 64, 65, 66, 67,
  43                 68, 69, 70, 71, 72, 73, 74, 75,
  44                 76, 77, 78, 79, 80, 81, 82, 83 },
  45         .oobfree = {
  46                 {.offset = 2,
  47                  .length = 10 },
  48                 {.offset = 84,
  49                  .length = 44 } }
  50 };
  51
  52 static int is_reading;
  53
  54 static void jz_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  55 {
  56         struct nand_chip *this = mtd->priv;
  57         uint32_t reg;
  58
  59         if (ctrl & NAND_CTRL_CHANGE) {
  60                 if (ctrl & NAND_ALE)
  61                         this->IO_ADDR_W = JZ_NAND_ADDR_ADDR;
  62                 else if (ctrl & NAND_CLE)
  63                         this->IO_ADDR_W = JZ_NAND_CMD_ADDR;
  64                 else
  65                         this->IO_ADDR_W = JZ_NAND_DATA_ADDR;
  66
  67                 reg = readl(&emc->nfcsr);
  68                 if (ctrl & NAND_NCE)
  69                         reg |= EMC_NFCSR_NFCE1;
  70                 else
  71                         reg &= ~EMC_NFCSR_NFCE1;
  72                 writel(reg, &emc->nfcsr);
  73         }
  74
  75         if (cmd != NAND_CMD_NONE)
  76                 writeb(cmd, this->IO_ADDR_W);
  77 }
  78
  79 static int jz_nand_device_ready(struct mtd_info *mtd)
  80 {
  81         return (readl(GPIO_PXPIN(2)) & 0x40000000) ? 1 : 0;
  82 }
  83
  84 void board_nand_select_device(struct nand_chip *nand, int chip)
  85 {
  86         /*
  87          * Don't use "chip" to address the NAND device,
  88          * generate the cs from the address where it is encoded.
  89          */
  90 }
  91
  92 static int jz_nand_rs_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
  93                                 u_char *ecc_code)
  94 {
  95         uint32_t status;
  96         int i;
  97
  98         if (is_reading)
  99                 return 0;
 100
 101         do {
 102                 status = readl(&emc->nfints);
 103         } while (!(status & EMC_NFINTS_ENCF));
 104
 105         /* disable ecc */
 106         writel(readl(&emc->nfecr) & ~EMC_NFECR_ECCE, &emc->nfecr);
 107
 108         for (i = 0; i < 9; i++)
 109                 ecc_code[i] = readb(&emc->nfpar[i]);
 110
 111         return 0;
 112 }
 113
 114 static void jz_nand_hwctl(struct mtd_info *mtd, int mode)
 115 {
 116         uint32_t reg;
 117
 118         writel(0, &emc->nfints);
 119         reg = readl(&emc->nfecr);
 120         reg |= JZ_NAND_ECC_CTRL_RESET;
 121         reg |= JZ_NAND_ECC_CTRL_ENABLE;
 122         reg |= JZ_NAND_ECC_CTRL_RS;
 123
 124         switch (mode) {
 125         case NAND_ECC_READ:
 126                 reg &= ~JZ_NAND_ECC_CTRL_ENCODING;
 127                 is_reading = 1;
 128                 break;
 129         case NAND_ECC_WRITE:
 130                 reg |= JZ_NAND_ECC_CTRL_ENCODING;
 131                 is_reading = 0;
 132                 break;
 133         default:
 134                 break;
 135         }
 136
 137         writel(reg, &emc->nfecr);
 138 }
 139
 140 /* Correct 1~9-bit errors in 512-bytes data */
 141 static void jz_rs_correct(unsigned char *dat, int idx, int mask)
 142 {
 143         int i;
 144
 145         idx--;
 146
 147         i = idx + (idx >> 3);
 148         if (i >= 512)
 149                 return;
 150
 151         mask <<= (idx & 0x7);
 152
 153         dat[i] ^= mask & 0xff;
 154         if (i < 511)
 155                 dat[i + 1] ^= (mask >> 8) & 0xff;
 156 }
 157
 158 static int jz_nand_rs_correct_data(struct mtd_info *mtd, u_char *dat,
 159                                    u_char *read_ecc, u_char *calc_ecc)
 160 {
 161         int k;
 162         uint32_t errcnt, index, mask, status;
 163
 164         /* Set PAR values */
 165         const uint8_t all_ff_ecc[] = {
 166                 0xcd, 0x9d, 0x90, 0x58, 0xf4, 0x8b, 0xff, 0xb7, 0x6f };
 167
 168         if (read_ecc[0] == 0xff && read_ecc[1] == 0xff &&
 169             read_ecc[2] == 0xff && read_ecc[3] == 0xff &&
 170             read_ecc[4] == 0xff && read_ecc[5] == 0xff &&
 171             read_ecc[6] == 0xff && read_ecc[7] == 0xff &&
 172             read_ecc[8] == 0xff) {
 173                 for (k = 0; k < 9; k++)
 174                         writeb(all_ff_ecc[k], &emc->nfpar[k]);
 175         } else {
 176                 for (k = 0; k < 9; k++)
 177                         writeb(read_ecc[k], &emc->nfpar[k]);
 178         }
 179         /* Set PRDY */
 180         writel(readl(&emc->nfecr) | EMC_NFECR_PRDY, &emc->nfecr);
 181
 182         /* Wait for completion */
 183         do {
 184                 status = readl(&emc->nfints);
 185         } while (!(status & EMC_NFINTS_DECF));
 186
 187         /* disable ecc */
 188         writel(readl(&emc->nfecr) & ~EMC_NFECR_ECCE, &emc->nfecr);
 189
 190         /* Check decoding */
 191         if (!(status & EMC_NFINTS_ERR))
 192                 return 0;
 193
 194         if (status & EMC_NFINTS_UNCOR) {
 195                 printf("uncorrectable ecc\n");
 196                 return -1;
 197         }
 198
 199         errcnt = (status & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT;
 200
 201         switch (errcnt) {
 202         case 4:
 203                 index = (readl(&emc->nferr[3]) & EMC_NFERR_INDEX_MASK) >>
 204                         EMC_NFERR_INDEX_BIT;
 205                 mask = (readl(&emc->nferr[3]) & EMC_NFERR_MASK_MASK) >>
 206                         EMC_NFERR_MASK_BIT;
 207                 jz_rs_correct(dat, index, mask);
 208         case 3:
 209                 index = (readl(&emc->nferr[2]) & EMC_NFERR_INDEX_MASK) >>
 210                         EMC_NFERR_INDEX_BIT;
 211                 mask = (readl(&emc->nferr[2]) & EMC_NFERR_MASK_MASK) >>
 212                         EMC_NFERR_MASK_BIT;
 213                 jz_rs_correct(dat, index, mask);
 214         case 2:
 215                 index = (readl(&emc->nferr[1]) & EMC_NFERR_INDEX_MASK) >>
 216                         EMC_NFERR_INDEX_BIT;
 217                 mask = (readl(&emc->nferr[1]) & EMC_NFERR_MASK_MASK) >>
 218                         EMC_NFERR_MASK_BIT;
 219                 jz_rs_correct(dat, index, mask);
 220         case 1:
 221                 index = (readl(&emc->nferr[0]) & EMC_NFERR_INDEX_MASK) >>
 222                         EMC_NFERR_INDEX_BIT;
 223                 mask = (readl(&emc->nferr[0]) & EMC_NFERR_MASK_MASK) >>
 224                         EMC_NFERR_MASK_BIT;
 225                 jz_rs_correct(dat, index, mask);
 226         default:
 227                 break;
 228         }
 229
 230         return errcnt;
 231 }
 232
 233 /*
 234  * Main initialization routine
 235  */
 236 int board_nand_init(struct nand_chip *nand)
 237 {
 238         uint32_t reg;
 239
 240         reg = readl(&emc->nfcsr);
 241         reg |= EMC_NFCSR_NFE1;  /* EMC setup, Set NFE bit */
 242         writel(reg, &emc->nfcsr);
 243
 244         writel(EMC_SMCR1_OPT_NAND, &emc->smcr[1]);
 245
 246         nand->IO_ADDR_R         = JZ_NAND_DATA_ADDR;
 247         nand->IO_ADDR_W         = JZ_NAND_DATA_ADDR;
 248         nand->cmd_ctrl          = jz_nand_cmd_ctrl;
 249         nand->dev_ready         = jz_nand_device_ready;
 250         nand->ecc.hwctl         = jz_nand_hwctl;
 251         nand->ecc.correct       = jz_nand_rs_correct_data;
 252         nand->ecc.calculate     = jz_nand_rs_calculate_ecc;
 253         nand->ecc.mode          = NAND_ECC_HW_OOB_FIRST;
 254         nand->ecc.size          = CONFIG_SYS_NAND_ECCSIZE;
 255         nand->ecc.bytes         = CONFIG_SYS_NAND_ECCBYTES;
 256         nand->ecc.strength      = 4;
 257         nand->ecc.layout        = &qi_lb60_ecclayout_2gb;
 258         nand->chip_delay        = 50;
 259         nand->options           = NAND_USE_FLASH_BBT;
 260
 261         return 0;
 262 }