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
18static 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
26static SPINAND_OP_VARIANTS(write_cache_variants,
27		SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
28		SPINAND_PROG_LOAD(true, 0, NULL, 0));
29
30static SPINAND_OP_VARIANTS(update_cache_variants,
31		SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
32		SPINAND_PROG_LOAD(false, 0, NULL, 0));
33
34static 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
46static 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
58static const struct mtd_ooblayout_ops w25m02gv_ooblayout = {
59	.ecc = w25m02gv_ooblayout_ecc,
60	.free = w25m02gv_ooblayout_free,
61};
62
63static 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
77static const struct spinand_info winbond_spinand_table[] = {
78	SPINAND_INFO("W25M02GV",
79		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xab),
80		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 2),
81		     NAND_ECCREQ(1, 512),
82		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
83					      &write_cache_variants,
84					      &update_cache_variants),
85		     0,
86		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL),
87		     SPINAND_SELECT_TARGET(w25m02gv_select_target)),
88	SPINAND_INFO("W25N01GV",
89		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xaa),
90		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
91		     NAND_ECCREQ(1, 512),
92		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
93					      &write_cache_variants,
94					      &update_cache_variants),
95		     0,
96		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
97};
98
99static int winbond_spinand_init(struct spinand_device *spinand)
100{
101	struct nand_device *nand = spinand_to_nand(spinand);
102	unsigned int i;
103
104	/*
105	 * Make sure all dies are in buffer read mode and not continuous read
106	 * mode.
107	 */
108	for (i = 0; i < nand->memorg.ntargets; i++) {
109		spinand_select_target(spinand, i);
110		spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ,
111				WINBOND_CFG_BUF_READ);
112	}
113
114	return 0;
115}
116
117static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
118	.init = winbond_spinand_init,
119};
120
121const struct spinand_manufacturer winbond_spinand_manufacturer = {
122	.id = SPINAND_MFR_WINBOND,
123	.name = "Winbond",
124	.chips = winbond_spinand_table,
125	.nchips = ARRAY_SIZE(winbond_spinand_table),
126	.ops = &winbond_spinand_manuf_ops,
127};
128