drivers/mtd/nand/ndfc.c

   1 /*
   2  * Overview:
   3  *   Platform independend driver for NDFC (NanD Flash Controller)
   4  *   integrated into IBM/AMCC PPC4xx cores
   5  *
   6  * (C) Copyright 2006-2009
   7  * Stefan Roese, DENX Software Engineering, sr@denx.de.
   8  *
   9  * Based on original work by
  10  *      Thomas Gleixner
  11  *      Copyright 2006 IBM
  12  *
  13  * SPDX-License-Identifier:     GPL-2.0+
  14  */
  15
  16 #include <common.h>
  17 #include <nand.h>
  18 #include <linux/mtd/ndfc.h>
  19 #include <linux/mtd/nand_ecc.h>
  20 #include <asm/processor.h>
  21 #include <asm/io.h>
  22 #include <asm/ppc4xx.h>
  23
  24 #ifndef CONFIG_SYS_NAND_BCR
  25 #define CONFIG_SYS_NAND_BCR 0x80002222
  26 #endif
  27 #ifndef CONFIG_SYS_NDFC_EBC0_CFG
  28 #define CONFIG_SYS_NDFC_EBC0_CFG 0xb8400000
  29 #endif
  30
  31 /*
  32  * We need to store the info, which chip-select (CS) is used for the
  33  * chip number. For example on Sequoia NAND chip #0 uses
  34  * CS #3.
  35  */
  36 static int ndfc_cs[NDFC_MAX_BANKS];
  37
  38 static void ndfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  39 {
  40         struct nand_chip *this = mtd->priv;
  41         ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
  42
  43         if (cmd == NAND_CMD_NONE)
  44                 return;
  45
  46         if (ctrl & NAND_CLE)
  47                 out_8((u8 *)(base + NDFC_CMD), cmd & 0xFF);
  48         else
  49                 out_8((u8 *)(base + NDFC_ALE), cmd & 0xFF);
  50 }
  51
  52 static int ndfc_dev_ready(struct mtd_info *mtdinfo)
  53 {
  54         struct nand_chip *this = mtdinfo->priv;
  55         ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
  56
  57         return (in_be32((u32 *)(base + NDFC_STAT)) & NDFC_STAT_IS_READY);
  58 }
  59
  60 static void ndfc_enable_hwecc(struct mtd_info *mtdinfo, int mode)
  61 {
  62         struct nand_chip *this = mtdinfo->priv;
  63         ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
  64         u32 ccr;
  65
  66         ccr = in_be32((u32 *)(base + NDFC_CCR));
  67         ccr |= NDFC_CCR_RESET_ECC;
  68         out_be32((u32 *)(base + NDFC_CCR), ccr);
  69 }
  70
  71 static int ndfc_calculate_ecc(struct mtd_info *mtdinfo,
  72                               const u_char *dat, u_char *ecc_code)
  73 {
  74         struct nand_chip *this = mtdinfo->priv;
  75         ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
  76         u32 ecc;
  77         u8 *p = (u8 *)&ecc;
  78
  79         ecc = in_be32((u32 *)(base + NDFC_ECC));
  80
  81         /* The NDFC uses Smart Media (SMC) bytes order
  82          */
  83         ecc_code[0] = p[1];
  84         ecc_code[1] = p[2];
  85         ecc_code[2] = p[3];
  86
  87         return 0;
  88 }
  89
  90 /*
  91  * Speedups for buffer read/write/verify
  92  *
  93  * NDFC allows 32bit read/write of data. So we can speed up the buffer
  94  * functions. No further checking, as nand_base will always read/write
  95  * page aligned.
  96  */
  97 static void ndfc_read_buf(struct mtd_info *mtdinfo, uint8_t *buf, int len)
  98 {
  99         struct nand_chip *this = mtdinfo->priv;
 100         ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 101         uint32_t *p = (uint32_t *) buf;
 102
 103         for (;len > 0; len -= 4)
 104                 *p++ = in_be32((u32 *)(base + NDFC_DATA));
 105 }
 106
 107 /*
 108  * Don't use these speedup functions in NAND boot image, since the image
 109  * has to fit into 4kByte.
 110  */
 111 static void ndfc_write_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
 112 {
 113         struct nand_chip *this = mtdinfo->priv;
 114         ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 115         uint32_t *p = (uint32_t *) buf;
 116
 117         for (; len > 0; len -= 4)
 118                 out_be32((u32 *)(base + NDFC_DATA), *p++);
 119 }
 120
 121 #if defined(CONFIG_MTD_NAND_VERIFY_WRITE)
 122 static int ndfc_verify_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
 123 {
 124         struct nand_chip *this = mtdinfo->priv;
 125         ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 126         uint32_t *p = (uint32_t *) buf;
 127
 128         for (; len > 0; len -= 4)
 129                 if (*p++ != in_be32((u32 *)(base + NDFC_DATA)))
 130                         return -1;
 131
 132         return 0;
 133 }
 134 #endif
 135
 136 /*
 137  * Read a byte from the NDFC.
 138  */
 139 static uint8_t ndfc_read_byte(struct mtd_info *mtd)
 140 {
 141
 142         struct nand_chip *chip = mtd->priv;
 143
 144 #ifdef CONFIG_SYS_NAND_BUSWIDTH_16BIT
 145         return (uint8_t) readw(chip->IO_ADDR_R);
 146 #else
 147         return readb(chip->IO_ADDR_R);
 148 #endif
 149
 150 }
 151
 152 void board_nand_select_device(struct nand_chip *nand, int chip)
 153 {
 154         /*
 155          * Don't use "chip" to address the NAND device,
 156          * generate the cs from the address where it is encoded.
 157          */
 158         ulong base = (ulong)nand->IO_ADDR_W & 0xffffff00;
 159         int cs = ndfc_cs[chip];
 160
 161         /* Set NandFlash Core Configuration Register */
 162         /* 1 col x 2 rows */
 163         out_be32((u32 *)(base + NDFC_CCR), 0x00000000 | (cs << 24));
 164         out_be32((u32 *)(base + NDFC_BCFG0 + (cs << 2)), CONFIG_SYS_NAND_BCR);
 165 }
 166
 167 static void ndfc_select_chip(struct mtd_info *mtd, int chip)
 168 {
 169         /*
 170          * Nothing to do here!
 171          */
 172 }
 173
 174 int board_nand_init(struct nand_chip *nand)
 175 {
 176         int cs = (ulong)nand->IO_ADDR_W & 0x00000003;
 177         ulong base = (ulong)nand->IO_ADDR_W & 0xffffff00;
 178         static int chip = 0;
 179
 180         /*
 181          * Save chip-select for this chip #
 182          */
 183         ndfc_cs[chip] = cs;
 184
 185         /*
 186          * Select required NAND chip in NDFC
 187          */
 188         board_nand_select_device(nand, chip);
 189
 190         nand->IO_ADDR_R = (void __iomem *)(base + NDFC_DATA);
 191         nand->IO_ADDR_W = (void __iomem *)(base + NDFC_DATA);
 192         nand->cmd_ctrl = ndfc_hwcontrol;
 193         nand->chip_delay = 50;
 194         nand->read_buf = ndfc_read_buf;
 195         nand->dev_ready = ndfc_dev_ready;
 196         nand->ecc.correct = nand_correct_data;
 197         nand->ecc.hwctl = ndfc_enable_hwecc;
 198         nand->ecc.calculate = ndfc_calculate_ecc;
 199         nand->ecc.mode = NAND_ECC_HW;
 200         nand->ecc.size = 256;
 201         nand->ecc.bytes = 3;
 202         nand->ecc.strength = 1;
 203         nand->select_chip = ndfc_select_chip;
 204
 205 #ifdef CONFIG_SYS_NAND_BUSWIDTH_16BIT
 206         nand->options |= NAND_BUSWIDTH_16;
 207 #endif
 208
 209         nand->write_buf  = ndfc_write_buf;
 210 #if defined(CONFIG_MTD_NAND_VERIFY_WRITE)
 211         nand->verify_buf = ndfc_verify_buf;
 212 #endif
 213         nand->read_byte = ndfc_read_byte;
 214
 215         chip++;
 216
 217         return 0;
 218 }