LXR uboot/drivers/mtd/nand/spi/micron.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2016-2017 Micron Technology, Inc.
   4 *
   5 * Authors:
   6 *      Peter Pan <peterpandong@micron.com>
   7 */
   8
   9#ifndef __UBOOT__
  10#include <linux/device.h>
  11#include <linux/kernel.h>
  12#endif
  13#include <linux/mtd/spinand.h>
  14
  15#define SPINAND_MFR_MICRON              0x2c
  16
  17#define MICRON_STATUS_ECC_MASK          GENMASK(7, 4)
  18#define MICRON_STATUS_ECC_NO_BITFLIPS   (0 << 4)
  19#define MICRON_STATUS_ECC_1TO3_BITFLIPS (1 << 4)
  20#define MICRON_STATUS_ECC_4TO6_BITFLIPS (3 << 4)
  21#define MICRON_STATUS_ECC_7TO8_BITFLIPS (5 << 4)
  22
  23static SPINAND_OP_VARIANTS(read_cache_variants,
  24                SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
  25                SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
  26                SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
  27                SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
  28                SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
  29                SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
  30
  31static SPINAND_OP_VARIANTS(write_cache_variants,
  32                SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
  33                SPINAND_PROG_LOAD(true, 0, NULL, 0));
  34
  35static SPINAND_OP_VARIANTS(update_cache_variants,
  36                SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
  37                SPINAND_PROG_LOAD(false, 0, NULL, 0));
  38
  39static int mt29f2g01abagd_ooblayout_ecc(struct mtd_info *mtd, int section,
  40                                        struct mtd_oob_region *region)
  41{
  42        if (section)
  43                return -ERANGE;
  44
  45        region->offset = 64;
  46        region->length = 64;
  47
  48        return 0;
  49}
  50
  51static int mt29f2g01abagd_ooblayout_free(struct mtd_info *mtd, int section,
  52                                         struct mtd_oob_region *region)
  53{
  54        if (section)
  55                return -ERANGE;
  56
  57        /* Reserve 2 bytes for the BBM. */
  58        region->offset = 2;
  59        region->length = 62;
  60
  61        return 0;
  62}
  63
  64static const struct mtd_ooblayout_ops mt29f2g01abagd_ooblayout = {
  65        .ecc = mt29f2g01abagd_ooblayout_ecc,
  66        .free = mt29f2g01abagd_ooblayout_free,
  67};
  68
  69static int mt29f2g01abagd_ecc_get_status(struct spinand_device *spinand,
  70                                         u8 status)
  71{
  72        switch (status & MICRON_STATUS_ECC_MASK) {
  73        case STATUS_ECC_NO_BITFLIPS:
  74                return 0;
  75
  76        case STATUS_ECC_UNCOR_ERROR:
  77                return -EBADMSG;
  78
  79        case MICRON_STATUS_ECC_1TO3_BITFLIPS:
  80                return 3;
  81
  82        case MICRON_STATUS_ECC_4TO6_BITFLIPS:
  83                return 6;
  84
  85        case MICRON_STATUS_ECC_7TO8_BITFLIPS:
  86                return 8;
  87
  88        default:
  89                break;
  90        }
  91
  92        return -EINVAL;
  93}
  94
  95static const struct spinand_info micron_spinand_table[] = {
  96        SPINAND_INFO("MT29F2G01ABAGD", 0x24,
  97                     NAND_MEMORG(1, 2048, 128, 64, 2048, 2, 1, 1),
  98                     NAND_ECCREQ(8, 512),
  99                     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 100                                              &write_cache_variants,
 101                                              &update_cache_variants),
 102                     0,
 103                     SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout,
 104                                     mt29f2g01abagd_ecc_get_status)),
 105};
 106
 107static int micron_spinand_detect(struct spinand_device *spinand)
 108{
 109        u8 *id = spinand->id.data;
 110        int ret;
 111
 112        /*
 113         * Micron SPI NAND read ID need a dummy byte,
 114         * so the first byte in raw_id is dummy.
 115         */
 116        if (id[1] != SPINAND_MFR_MICRON)
 117                return 0;
 118
 119        ret = spinand_match_and_init(spinand, micron_spinand_table,
 120                                     ARRAY_SIZE(micron_spinand_table), id[2]);
 121        if (ret)
 122                return ret;
 123
 124        return 1;
 125}
 126
 127static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
 128        .detect = micron_spinand_detect,
 129};
 130
 131const struct spinand_manufacturer micron_spinand_manufacturer = {
 132        .id = SPINAND_MFR_MICRON,
 133        .name = "Micron",
 134        .ops = &micron_spinand_manuf_ops,
 135};
 136