drivers/mtd/nand/spi/macronix.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018 Macronix
   4  *
   5  * Author: Boris Brezillon <boris.brezillon@bootlin.com>
   6  */
   7
   8 #include <linux/device.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mtd/spinand.h>
  11
  12 #define SPINAND_MFR_MACRONIX            0xC2
  13 #define MACRONIX_ECCSR_MASK             0x0F
  14
  15 static SPINAND_OP_VARIANTS(read_cache_variants,
  16                 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
  17                 SPINAND_PAGE_READ_FROM_CACHE_X2_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 static int mx35lfxge4ab_ooblayout_ecc(struct mtd_info *mtd, int section,
  30                                       struct mtd_oob_region *region)
  31 {
  32         return -ERANGE;
  33 }
  34
  35 static int mx35lfxge4ab_ooblayout_free(struct mtd_info *mtd, int section,
  36                                        struct mtd_oob_region *region)
  37 {
  38         if (section)
  39                 return -ERANGE;
  40
  41         region->offset = 2;
  42         region->length = mtd->oobsize - 2;
  43
  44         return 0;
  45 }
  46
  47 static const struct mtd_ooblayout_ops mx35lfxge4ab_ooblayout = {
  48         .ecc = mx35lfxge4ab_ooblayout_ecc,
  49         .free = mx35lfxge4ab_ooblayout_free,
  50 };
  51
  52 static int mx35lf1ge4ab_get_eccsr(struct spinand_device *spinand, u8 *eccsr)
  53 {
  54         struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0x7c, 1),
  55                                           SPI_MEM_OP_NO_ADDR,
  56                                           SPI_MEM_OP_DUMMY(1, 1),
  57                                           SPI_MEM_OP_DATA_IN(1, eccsr, 1));
  58
  59         int ret = spi_mem_exec_op(spinand->spimem, &op);
  60         if (ret)
  61                 return ret;
  62
  63         *eccsr &= MACRONIX_ECCSR_MASK;
  64         return 0;
  65 }
  66
  67 static int mx35lf1ge4ab_ecc_get_status(struct spinand_device *spinand,
  68                                        u8 status)
  69 {
  70         struct nand_device *nand = spinand_to_nand(spinand);
  71         u8 eccsr;
  72
  73         switch (status & STATUS_ECC_MASK) {
  74         case STATUS_ECC_NO_BITFLIPS:
  75                 return 0;
  76
  77         case STATUS_ECC_UNCOR_ERROR:
  78                 return -EBADMSG;
  79
  80         case STATUS_ECC_HAS_BITFLIPS:
  81                 /*
  82                  * Let's try to retrieve the real maximum number of bitflips
  83                  * in order to avoid forcing the wear-leveling layer to move
  84                  * data around if it's not necessary.
  85                  */
  86                 if (mx35lf1ge4ab_get_eccsr(spinand, &eccsr))
  87                         return nand->eccreq.strength;
  88
  89                 if (WARN_ON(eccsr > nand->eccreq.strength || !eccsr))
  90                         return nand->eccreq.strength;
  91
  92                 return eccsr;
  93
  94         default:
  95                 break;
  96         }
  97
  98         return -EINVAL;
  99 }
 100
 101 static const struct spinand_info macronix_spinand_table[] = {
 102         SPINAND_INFO("MX35LF1GE4AB", 0x12,
 103                      NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
 104                      NAND_ECCREQ(4, 512),
 105                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 106                                               &write_cache_variants,
 107                                               &update_cache_variants),
 108                      SPINAND_HAS_QE_BIT,
 109                      SPINAND_ECCINFO(&mx35lfxge4ab_ooblayout,
 110                                      mx35lf1ge4ab_ecc_get_status)),
 111         SPINAND_INFO("MX35LF2GE4AB", 0x22,
 112                      NAND_MEMORG(1, 2048, 64, 64, 2048, 40, 2, 1, 1),
 113                      NAND_ECCREQ(4, 512),
 114                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 115                                               &write_cache_variants,
 116                                               &update_cache_variants),
 117                      SPINAND_HAS_QE_BIT,
 118                      SPINAND_ECCINFO(&mx35lfxge4ab_ooblayout, NULL)),
 119 };
 120
 121 static int macronix_spinand_detect(struct spinand_device *spinand)
 122 {
 123         u8 *id = spinand->id.data;
 124         int ret;
 125
 126         /*
 127          * Macronix SPI NAND read ID needs a dummy byte, so the first byte in
 128          * raw_id is garbage.
 129          */
 130         if (id[1] != SPINAND_MFR_MACRONIX)
 131                 return 0;
 132
 133         ret = spinand_match_and_init(spinand, macronix_spinand_table,
 134                                      ARRAY_SIZE(macronix_spinand_table),
 135                                      id[2]);
 136         if (ret)
 137                 return ret;
 138
 139         return 1;
 140 }
 141
 142 static const struct spinand_manufacturer_ops macronix_spinand_manuf_ops = {
 143         .detect = macronix_spinand_detect,
 144 };
 145
 146 const struct spinand_manufacturer macronix_spinand_manufacturer = {
 147         .id = SPINAND_MFR_MACRONIX,
 148         .name = "Macronix",
 149         .ops = &macronix_spinand_manuf_ops,
 150 };