Quelle  foresee.c   Sprache: C

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2023, SberDevices. All Rights Reserved.
 *
 * Author: Martin Kurbanov <mmkurbanov@salutedevices.com>
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>

#define SPINAND_MFR_FORESEE  0xCD

static SPINAND_OP_VARIANTS(read_cache_variants,
  SPINAND_PAGE_READ_FROM_CACHE_1S_1S_4S_OP(0, 1, NULL, 0, 0),
  SPINAND_PAGE_READ_FROM_CACHE_1S_1S_2S_OP(0, 1, NULL, 0, 0),
  SPINAND_PAGE_READ_FROM_CACHE_FAST_1S_1S_1S_OP(0, 1, NULL, 0, 0),
  SPINAND_PAGE_READ_FROM_CACHE_1S_1S_1S_OP(0, 1, NULL, 0, 0));

static SPINAND_OP_VARIANTS(write_cache_variants,
  SPINAND_PROG_LOAD_1S_1S_4S_OP(true, 0, NULL, 0),
  SPINAND_PROG_LOAD_1S_1S_1S_OP(true, 0, NULL, 0));

static SPINAND_OP_VARIANTS(update_cache_variants,
  SPINAND_PROG_LOAD_1S_1S_4S_OP(false, 0, NULL, 0),
  SPINAND_PROG_LOAD_1S_1S_1S_OP(false, 0, NULL, 0));

static int f35sqa002g_ooblayout_ecc(struct mtd_info *mtd, int section,
        struct mtd_oob_region *region)
{
 return -ERANGE;
}

static int f35sqa002g_ooblayout_free(struct mtd_info *mtd, int section,
         struct mtd_oob_region *region)
{
 if (section)
  return -ERANGE;

 /* Reserve 2 bytes for the BBM. */
 region->offset = 2;
 region->length = 62;

 return 0;
}

static const struct mtd_ooblayout_ops f35sqa002g_ooblayout = {
 .ecc = f35sqa002g_ooblayout_ecc,
 .free = f35sqa002g_ooblayout_free,
};

static int f35sqa002g_ecc_get_status(struct spinand_device *spinand, u8 status)
{
 struct nand_device *nand = spinand_to_nand(spinand);

 switch (status & STATUS_ECC_MASK) {
 case STATUS_ECC_NO_BITFLIPS:
  return 0;

 case STATUS_ECC_HAS_BITFLIPS:
  return nanddev_get_ecc_conf(nand)->strength;

 default:
  break;
 }

 /* More than 1-bit error was detected in one or more sectors and
 * cannot be corrected.
 */
 return -EBADMSG;
}

static const struct spinand_info foresee_spinand_table[] = {
 SPINAND_INFO("F35SQA002G",
       SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x72, 0x72),
       NAND_MEMORG(1, 2048, 64, 64, 2048, 40, 1, 1, 1),
       NAND_ECCREQ(1, 512),
       SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
           &write_cache_variants,
           &update_cache_variants),
       SPINAND_HAS_QE_BIT,
       SPINAND_ECCINFO(&f35sqa002g_ooblayout,
         f35sqa002g_ecc_get_status)),
 SPINAND_INFO("F35SQA001G",
       SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x71, 0x71),
       NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
       NAND_ECCREQ(1, 512),
       SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
           &write_cache_variants,
           &update_cache_variants),
       SPINAND_HAS_QE_BIT,
       SPINAND_ECCINFO(&f35sqa002g_ooblayout,
         f35sqa002g_ecc_get_status)),
};

static const struct spinand_manufacturer_ops foresee_spinand_manuf_ops = {
};

const struct spinand_manufacturer foresee_spinand_manufacturer = {
 .id = SPINAND_MFR_FORESEE,
 .name = "FORESEE",
 .chips = foresee_spinand_table,
 .nchips = ARRAY_SIZE(foresee_spinand_table),
 .ops = &foresee_spinand_manuf_ops,
};