1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2021 Rockchip Electronics Co., Ltd
4 *
5 * Authors:
6 * Dingqiang Lin <jon.lin@rock-chips.com>
7 */
8
9 #include <linux/device.h>
10 #include <linux/kernel.h>
11 #include <linux/mtd/spinand.h>
12
13 #define SPINAND_MFR_UNIM 0xA1
14
15 static SPINAND_OP_VARIANTS(read_cache_variants,
16 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
17 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
18 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
19 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
20 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
21 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
22
23 static SPINAND_OP_VARIANTS(write_cache_variants,
24 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
25 SPINAND_PROG_LOAD(true, 0, NULL, 0));
26
27 static SPINAND_OP_VARIANTS(update_cache_variants,
28 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
29 SPINAND_PROG_LOAD(false, 0, NULL, 0));
30
tx25g01_ooblayout_ecc(struct mtd_info * mtd,int section,struct mtd_oob_region * region)31 static int tx25g01_ooblayout_ecc(struct mtd_info *mtd, int section,
32 struct mtd_oob_region *region)
33 {
34 if (section > 3)
35 return -ERANGE;
36
37 region->offset = (16 * section) + 8;
38 region->length = 8;
39
40 return 0;
41 }
42
tx25g01_ooblayout_free(struct mtd_info * mtd,int section,struct mtd_oob_region * region)43 static int tx25g01_ooblayout_free(struct mtd_info *mtd, int section,
44 struct mtd_oob_region *region)
45 {
46 if (section > 3)
47 return -ERANGE;
48
49 region->offset = (16 * section) + 2;
50 region->length = 6;
51
52 return 0;
53 }
54
55 static const struct mtd_ooblayout_ops tx25g01_ooblayout = {
56 .ecc = tx25g01_ooblayout_ecc,
57 .free = tx25g01_ooblayout_free,
58 };
59
60 /*
61 * ecc bits: 0xC0[4,6]
62 * [0b000], No bit errors were detected;
63 * [0b001, 0b011], 1~3 Bit errors were detected and corrected. Not
64 * reach Flipping Bits;
65 * [0b100], Bit error count equals the bit flip
66 * detection threshold
67 * others, Reserved.
68 */
tx25g01_ecc_get_status(struct spinand_device * spinand,u8 status)69 static int tx25g01_ecc_get_status(struct spinand_device *spinand,
70 u8 status)
71 {
72 struct nand_device *nand = spinand_to_nand(spinand);
73 u8 eccsr = (status & GENMASK(6, 4)) >> 4;
74
75 if (eccsr < 4)
76 return eccsr;
77 else if (eccsr == 4)
78 return nanddev_get_ecc_requirements(nand)->strength;
79 else
80 return -EBADMSG;
81 }
82
83 static const struct spinand_info unim_spinand_table[] = {
84 SPINAND_INFO("TX25G01",
85 SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xF1),
86 NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
87 NAND_ECCREQ(4, 512),
88 SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
89 &write_cache_variants,
90 &update_cache_variants),
91 SPINAND_HAS_QE_BIT,
92 SPINAND_ECCINFO(&tx25g01_ooblayout, tx25g01_ecc_get_status)),
93 };
94
95 static const struct spinand_manufacturer_ops unim_spinand_manuf_ops = {
96 };
97
98 const struct spinand_manufacturer unim_spinand_manufacturer = {
99 .id = SPINAND_MFR_UNIM,
100 .name = "UNIM",
101 .chips = unim_spinand_table,
102 .nchips = ARRAY_SIZE(unim_spinand_table),
103 .ops = &unim_spinand_manuf_ops,
104 };
105