nand/spi/ato.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (C) 2022 Aidan MacDonald
0004  *
0005  * Author: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
0006  */
0007
0008 #include <linux/device.h>
0009 #include <linux/kernel.h>
0010 #include <linux/mtd/spinand.h>
0011
0012
0013 #define SPINAND_MFR_ATO     0x9b
0014
0015
0016 static SPINAND_OP_VARIANTS(read_cache_variants,
0017         SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
0018         SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
0019         SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
0020
0021 static SPINAND_OP_VARIANTS(write_cache_variants,
0022         SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
0023         SPINAND_PROG_LOAD(true, 0, NULL, 0));
0024
0025 static SPINAND_OP_VARIANTS(update_cache_variants,
0026         SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
0027         SPINAND_PROG_LOAD(false, 0, NULL, 0));
0028
0029
0030 static int ato25d1ga_ooblayout_ecc(struct mtd_info *mtd, int section,
0031                    struct mtd_oob_region *region)
0032 {
0033     if (section > 3)
0034         return -ERANGE;
0035
0036     region->offset = (16 * section) + 8;
0037     region->length = 8;
0038     return 0;
0039 }
0040
0041 static int ato25d1ga_ooblayout_free(struct mtd_info *mtd, int section,
0042                    struct mtd_oob_region *region)
0043 {
0044     if (section > 3)
0045         return -ERANGE;
0046
0047     if (section) {
0048         region->offset = (16 * section);
0049         region->length = 8;
0050     } else {
0051         /* first byte of section 0 is reserved for the BBM */
0052         region->offset = 1;
0053         region->length = 7;
0054     }
0055
0056     return 0;
0057 }
0058
0059 static const struct mtd_ooblayout_ops ato25d1ga_ooblayout = {
0060     .ecc = ato25d1ga_ooblayout_ecc,
0061     .free = ato25d1ga_ooblayout_free,
0062 };
0063
0064
0065 static const struct spinand_info ato_spinand_table[] = {
0066     SPINAND_INFO("ATO25D1GA",
0067              SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x12),
0068              NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
0069              NAND_ECCREQ(1, 512),
0070              SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
0071                           &write_cache_variants,
0072                           &update_cache_variants),
0073              SPINAND_HAS_QE_BIT,
0074              SPINAND_ECCINFO(&ato25d1ga_ooblayout, NULL)),
0075 };
0076
0077 static const struct spinand_manufacturer_ops ato_spinand_manuf_ops = {
0078 };
0079
0080 const struct spinand_manufacturer ato_spinand_manufacturer = {
0081     .id = SPINAND_MFR_ATO,
0082     .name = "ATO",
0083     .chips = ato_spinand_table,
0084     .nchips = ARRAY_SIZE(ato_spinand_table),
0085     .ops = &ato_spinand_manuf_ops,
0086 };