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 
w25m02gv_ooblayout_ecc(struct mtd_info * mtd,int section,struct mtd_oob_region * region)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 
w25m02gv_ooblayout_free(struct mtd_info * mtd,int section,struct mtd_oob_region * region)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 
w25m02gv_select_target(struct spinand_device * spinand,unsigned int target)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",
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 
winbond_spinand_init(struct spinand_device * spinand)99 static 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 
117 static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
118 	.init = winbond_spinand_init,
119 };
120 
121 const 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