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 #ifndef __UBOOT__
  11 #include <linux/device.h>
  12 #include <linux/kernel.h>
  13 #endif
  14 #include <linux/mtd/spinand.h>
  15
  16 #define SPINAND_MFR_WINBOND             0xEF
  17
  18 #define WINBOND_CFG_BUF_READ            BIT(3)
  19
  20 static SPINAND_OP_VARIANTS(read_cache_variants,
  21                 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
  22                 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
  23                 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
  24                 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
  25                 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
  26                 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
  27
  28 static SPINAND_OP_VARIANTS(write_cache_variants,
  29                 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
  30                 SPINAND_PROG_LOAD(true, 0, NULL, 0));
  31
  32 static SPINAND_OP_VARIANTS(update_cache_variants,
  33                 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
  34                 SPINAND_PROG_LOAD(false, 0, NULL, 0));
  35
  36 static int w25m02gv_ooblayout_ecc(struct mtd_info *mtd, int section,
  37                                   struct mtd_oob_region *region)
  38 {
  39         if (section > 3)
  40                 return -ERANGE;
  41
  42         region->offset = (16 * section) + 8;
  43         region->length = 8;
  44
  45         return 0;
  46 }
  47
  48 static int w25m02gv_ooblayout_free(struct mtd_info *mtd, int section,
  49                                    struct mtd_oob_region *region)
  50 {
  51         if (section > 3)
  52                 return -ERANGE;
  53
  54         region->offset = (16 * section) + 2;
  55         region->length = 6;
  56
  57         return 0;
  58 }
  59
  60 static const struct mtd_ooblayout_ops w25m02gv_ooblayout = {
  61         .ecc = w25m02gv_ooblayout_ecc,
  62         .free = w25m02gv_ooblayout_free,
  63 };
  64
  65 static int w25m02gv_select_target(struct spinand_device *spinand,
  66                                   unsigned int target)
  67 {
  68         struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1),
  69                                           SPI_MEM_OP_NO_ADDR,
  70                                           SPI_MEM_OP_NO_DUMMY,
  71                                           SPI_MEM_OP_DATA_OUT(1,
  72                                                         spinand->scratchbuf,
  73                                                         1));
  74
  75         *spinand->scratchbuf = target;
  76         return spi_mem_exec_op(spinand->slave, &op);
  77 }
  78
  79 static const struct spinand_info winbond_spinand_table[] = {
  80         SPINAND_INFO("W25M02GV", 0xAB,
  81                      NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 2),
  82                      NAND_ECCREQ(1, 512),
  83                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
  84                                               &write_cache_variants,
  85                                               &update_cache_variants),
  86                      0,
  87                      SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL),
  88                      SPINAND_SELECT_TARGET(w25m02gv_select_target)),
  89 };
  90
  91 /**
  92  * winbond_spinand_detect - initialize device related part in spinand_device
  93  * struct if it is a Winbond device.
  94  * @spinand: SPI NAND device structure
  95  */
  96 static int winbond_spinand_detect(struct spinand_device *spinand)
  97 {
  98         u8 *id = spinand->id.data;
  99         int ret;
 100
 101         /*
 102          * Winbond SPI NAND read ID need a dummy byte,
 103          * so the first byte in raw_id is dummy.
 104          */
 105         if (id[1] != SPINAND_MFR_WINBOND)
 106                 return 0;
 107
 108         ret = spinand_match_and_init(spinand, winbond_spinand_table,
 109                                      ARRAY_SIZE(winbond_spinand_table), id[2]);
 110         if (ret)
 111                 return ret;
 112
 113         return 1;
 114 }
 115
 116 static int winbond_spinand_init(struct spinand_device *spinand)
 117 {
 118         struct nand_device *nand = spinand_to_nand(spinand);
 119         unsigned int i;
 120
 121         /*
 122          * Make sure all dies are in buffer read mode and not continuous read
 123          * mode.
 124          */
 125         for (i = 0; i < nand->memorg.ntargets; i++) {
 126                 spinand_select_target(spinand, i);
 127                 spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ,
 128                                 WINBOND_CFG_BUF_READ);
 129         }
 130
 131         return 0;
 132 }
 133
 134 static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
 135         .detect = winbond_spinand_detect,
 136         .init = winbond_spinand_init,
 137 };
 138
 139 const struct spinand_manufacturer winbond_spinand_manufacturer = {
 140         .id = SPINAND_MFR_WINBOND,
 141         .name = "Winbond",
 142         .ops = &winbond_spinand_manuf_ops,
 143 };