drivers/mtd/nand/spi/winbond.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2017 exceet electronics GmbH
   4  *
   5  * Authors:
   6  *      Frieder Schrempf <frieder.schrempf@exceet.de>
   7  *      Boris Brezillon <boris.brezillon@bootlin.com>
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mtd/spinand.h>
  13
  14 #define SPINAND_MFR_WINBOND             0xEF
  15
  16 #define WINBOND_CFG_BUF_READ            BIT(3)
  17
  18 static SPINAND_OP_VARIANTS(read_cache_variants,
  19                 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
  20                 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
  21                 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
  22                 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
  23                 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
  24                 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
  25
  26 static SPINAND_OP_VARIANTS(write_cache_variants,
  27                 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
  28                 SPINAND_PROG_LOAD(true, 0, NULL, 0));
  29
  30 static SPINAND_OP_VARIANTS(update_cache_variants,
  31                 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
  32                 SPINAND_PROG_LOAD(false, 0, NULL, 0));
  33
  34 static int w25m02gv_ooblayout_ecc(struct mtd_info *mtd, int section,
  35                                   struct mtd_oob_region *region)
  36 {
  37         if (section > 3)
  38                 return -ERANGE;
  39
  40         region->offset = (16 * section) + 8;
  41         region->length = 8;
  42
  43         return 0;
  44 }
  45
  46 static int w25m02gv_ooblayout_free(struct mtd_info *mtd, int section,
  47                                    struct mtd_oob_region *region)
  48 {
  49         if (section > 3)
  50                 return -ERANGE;
  51
  52         region->offset = (16 * section) + 2;
  53         region->length = 6;
  54
  55         return 0;
  56 }
  57
  58 static const struct mtd_ooblayout_ops w25m02gv_ooblayout = {
  59         .ecc = w25m02gv_ooblayout_ecc,
  60         .free = w25m02gv_ooblayout_free,
  61 };
  62
  63 static int w25m02gv_select_target(struct spinand_device *spinand,
  64                                   unsigned int target)
  65 {
  66         struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1),
  67                                           SPI_MEM_OP_NO_ADDR,
  68                                           SPI_MEM_OP_NO_DUMMY,
  69                                           SPI_MEM_OP_DATA_OUT(1,
  70                                                         spinand->scratchbuf,
  71                                                         1));
  72
  73         *spinand->scratchbuf = target;
  74         return spi_mem_exec_op(spinand->spimem, &op);
  75 }
  76
  77 static const struct spinand_info winbond_spinand_table[] = {
  78         SPINAND_INFO("W25M02GV", 0xAB,
  79                      NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 2),
  80                      NAND_ECCREQ(1, 512),
  81                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
  82                                               &write_cache_variants,
  83                                               &update_cache_variants),
  84                      0,
  85                      SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL),
  86                      SPINAND_SELECT_TARGET(w25m02gv_select_target)),
  87 };
  88
  89 /**
  90  * winbond_spinand_detect - initialize device related part in spinand_device
  91  * struct if it is a Winbond device.
  92  * @spinand: SPI NAND device structure
  93  */
  94 static int winbond_spinand_detect(struct spinand_device *spinand)
  95 {
  96         u8 *id = spinand->id.data;
  97         int ret;
  98
  99         /*
 100          * Winbond SPI NAND read ID need a dummy byte,
 101          * so the first byte in raw_id is dummy.
 102          */
 103         if (id[1] != SPINAND_MFR_WINBOND)
 104                 return 0;
 105
 106         ret = spinand_match_and_init(spinand, winbond_spinand_table,
 107                                      ARRAY_SIZE(winbond_spinand_table), id[2]);
 108         if (ret)
 109                 return ret;
 110
 111         return 1;
 112 }
 113
 114 static int winbond_spinand_init(struct spinand_device *spinand)
 115 {
 116         struct nand_device *nand = spinand_to_nand(spinand);
 117         unsigned int i;
 118
 119         /*
 120          * Make sure all dies are in buffer read mode and not continuous read
 121          * mode.
 122          */
 123         for (i = 0; i < nand->memorg.ntargets; i++) {
 124                 spinand_select_target(spinand, i);
 125                 spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ,
 126                                 WINBOND_CFG_BUF_READ);
 127         }
 128
 129         return 0;
 130 }
 131
 132 static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
 133         .detect = winbond_spinand_detect,
 134         .init = winbond_spinand_init,
 135 };
 136
 137 const struct spinand_manufacturer winbond_spinand_manufacturer = {
 138         .id = SPINAND_MFR_WINBOND,
 139         .name = "Winbond",
 140         .ops = &winbond_spinand_manuf_ops,
 141 };