// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2022 Aidan MacDonald
 *
 * Author: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
 */

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


#define SPINAND_MFR_ATO         0x9b


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_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 ato25d1ga_ooblayout_ecc(struct mtd_info *mtd, int section,
                                   struct mtd_oob_region *region)
{
        if (section > 3)
                return -ERANGE;

        region->offset = (16 * section) + 8;
        region->length = 8;
        return 0;
}

static int ato25d1ga_ooblayout_free(struct mtd_info *mtd, int section,
                                   struct mtd_oob_region *region)
{
        if (section > 3)
                return -ERANGE;

        if (section) {
                region->offset = (16 * section);
                region->length = 8;
        } else {
                /* first byte of section 0 is reserved for the BBM */
                region->offset = 1;
                region->length = 7;
        }

        return 0;
}

static const struct mtd_ooblayout_ops ato25d1ga_ooblayout = {
        .ecc = ato25d1ga_ooblayout_ecc,
        .free = ato25d1ga_ooblayout_free,
};


static const struct spinand_info ato_spinand_table[] = {
        SPINAND_INFO("ATO25D1GA",
                     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x12),
                     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(&ato25d1ga_ooblayout, NULL)),
};

static const struct spinand_manufacturer_ops ato_spinand_manuf_ops = {
};

const struct spinand_manufacturer ato_spinand_manufacturer = {
        .id = SPINAND_MFR_ATO,
        .name = "ATO",
        .chips = ato_spinand_table,
        .nchips = ARRAY_SIZE(ato_spinand_table),
        .ops = &ato_spinand_manuf_ops,
};