1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2017 exceet electronics GmbH
6 * Frieder Schrempf <frieder.schrempf@exceet.de>
7 * Boris Brezillon <boris.brezillon@bootlin.com>
11 #include <linux/device.h>
12 #include <linux/kernel.h>
14 #include <linux/mtd/spinand.h>
16 #define SPINAND_MFR_WINBOND 0xEF
18 #define WINBOND_CFG_BUF_READ BIT(3)
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));
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));
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));
36 static int w25m02gv_ooblayout_ecc(struct mtd_info *mtd, int section,
37 struct mtd_oob_region *region)
42 region->offset = (16 * section) + 8;
48 static int w25m02gv_ooblayout_free(struct mtd_info *mtd, int section,
49 struct mtd_oob_region *region)
54 region->offset = (16 * section) + 2;
60 static const struct mtd_ooblayout_ops w25m02gv_ooblayout = {
61 .ecc = w25m02gv_ooblayout_ecc,
62 .free = w25m02gv_ooblayout_free,
65 static int w25m02gv_select_target(struct spinand_device *spinand,
68 struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1),
71 SPI_MEM_OP_DATA_OUT(1,
75 *spinand->scratchbuf = target;
76 return spi_mem_exec_op(spinand->slave, &op);
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),
83 SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
84 &write_cache_variants,
85 &update_cache_variants),
87 SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL),
88 SPINAND_SELECT_TARGET(w25m02gv_select_target)),
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
96 static int winbond_spinand_detect(struct spinand_device *spinand)
98 u8 *id = spinand->id.data;
102 * Winbond SPI NAND read ID need a dummy byte,
103 * so the first byte in raw_id is dummy.
105 if (id[1] != SPINAND_MFR_WINBOND)
108 ret = spinand_match_and_init(spinand, winbond_spinand_table,
109 ARRAY_SIZE(winbond_spinand_table), id[2]);
116 static int winbond_spinand_init(struct spinand_device *spinand)
118 struct nand_device *nand = spinand_to_nand(spinand);
122 * Make sure all dies are in buffer read mode and not continuous read
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);
134 static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
135 .detect = winbond_spinand_detect,
136 .init = winbond_spinand_init,
139 const struct spinand_manufacturer winbond_spinand_manufacturer = {
140 .id = SPINAND_MFR_WINBOND,
142 .ops = &winbond_spinand_manuf_ops,