drivers/mtd/nand/spi/ato.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2022 Aidan MacDonald
   4  *
   5  * Author: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
   6  */
   7
   8 #include <linux/device.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mtd/spinand.h>
  11
  12
  13 #define SPINAND_MFR_ATO         0x9b
  14
  15
  16 static SPINAND_OP_VARIANTS(read_cache_variants,
  17                 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
  18                 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
  19                 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
  20
  21 static SPINAND_OP_VARIANTS(write_cache_variants,
  22                 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
  23                 SPINAND_PROG_LOAD(true, 0, NULL, 0));
  24
  25 static SPINAND_OP_VARIANTS(update_cache_variants,
  26                 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
  27                 SPINAND_PROG_LOAD(false, 0, NULL, 0));
  28
  29
  30 static int ato25d1ga_ooblayout_ecc(struct mtd_info *mtd, int section,
  31                                    struct mtd_oob_region *region)
  32 {
  33         if (section > 3)
  34                 return -ERANGE;
  35
  36         region->offset = (16 * section) + 8;
  37         region->length = 8;
  38         return 0;
  39 }
  40
  41 static int ato25d1ga_ooblayout_free(struct mtd_info *mtd, int section,
  42                                    struct mtd_oob_region *region)
  43 {
  44         if (section > 3)
  45                 return -ERANGE;
  46
  47         if (section) {
  48                 region->offset = (16 * section);
  49                 region->length = 8;
  50         } else {
  51                 /* first byte of section 0 is reserved for the BBM */
  52                 region->offset = 1;
  53                 region->length = 7;
  54         }
  55
  56         return 0;
  57 }
  58
  59 static const struct mtd_ooblayout_ops ato25d1ga_ooblayout = {
  60         .ecc = ato25d1ga_ooblayout_ecc,
  61         .free = ato25d1ga_ooblayout_free,
  62 };
  63
  64
  65 static const struct spinand_info ato_spinand_table[] = {
  66         SPINAND_INFO("ATO25D1GA",
  67                      SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x12),
  68                      NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
  69                      NAND_ECCREQ(1, 512),
  70                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
  71                                               &write_cache_variants,
  72                                               &update_cache_variants),
  73                      SPINAND_HAS_QE_BIT,
  74                      SPINAND_ECCINFO(&ato25d1ga_ooblayout, NULL)),
  75 };
  76
  77 static const struct spinand_manufacturer_ops ato_spinand_manuf_ops = {
  78 };
  79
  80 const struct spinand_manufacturer ato_spinand_manufacturer = {
  81         .id = SPINAND_MFR_ATO,
  82         .name = "ATO",
  83         .chips = ato_spinand_table,
  84         .nchips = ARRAY_SIZE(ato_spinand_table),
  85         .ops = &ato_spinand_manuf_ops,
  86 };