1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2019 Jeff Kletsky
4  *
5  * Author: Jeff Kletsky <git-commits@allycomm.com>
6  */
7 
8 #include <linux/device.h>
9 #include <linux/kernel.h>
10 #include <linux/mtd/spinand.h>
11 
12 
13 #define SPINAND_MFR_PARAGON	0xa1
14 
15 
16 #define PN26G0XA_STATUS_ECC_BITMASK		(3 << 4)
17 
18 #define PN26G0XA_STATUS_ECC_NONE_DETECTED	(0 << 4)
19 #define PN26G0XA_STATUS_ECC_1_7_CORRECTED	(1 << 4)
20 #define PN26G0XA_STATUS_ECC_ERRORED		(2 << 4)
21 #define PN26G0XA_STATUS_ECC_8_CORRECTED		(3 << 4)
22 
23 
24 static SPINAND_OP_VARIANTS(read_cache_variants,
25 		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
26 		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
27 		SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
28 		SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
29 		SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
30 		SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
31 
32 static SPINAND_OP_VARIANTS(write_cache_variants,
33 		SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
34 		SPINAND_PROG_LOAD(true, 0, NULL, 0));
35 
36 static SPINAND_OP_VARIANTS(update_cache_variants,
37 		SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
38 		SPINAND_PROG_LOAD(false, 0, NULL, 0));
39 
40 
pn26g0xa_ooblayout_ecc(struct mtd_info * mtd,int section,struct mtd_oob_region * region)41 static int pn26g0xa_ooblayout_ecc(struct mtd_info *mtd, int section,
42 				   struct mtd_oob_region *region)
43 {
44 	if (section > 3)
45 		return -ERANGE;
46 
47 	region->offset = 6 + (15 * section); /* 4 BBM + 2 user bytes */
48 	region->length = 13;
49 
50 	return 0;
51 }
52 
pn26g0xa_ooblayout_free(struct mtd_info * mtd,int section,struct mtd_oob_region * region)53 static int pn26g0xa_ooblayout_free(struct mtd_info *mtd, int section,
54 				   struct mtd_oob_region *region)
55 {
56 	if (section > 4)
57 		return -ERANGE;
58 
59 	if (section == 4) {
60 		region->offset = 64;
61 		region->length = 64;
62 	} else {
63 		region->offset = 4 + (15 * section);
64 		region->length = 2;
65 	}
66 
67 	return 0;
68 }
69 
pn26g0xa_ecc_get_status(struct spinand_device * spinand,u8 status)70 static int pn26g0xa_ecc_get_status(struct spinand_device *spinand,
71 				   u8 status)
72 {
73 	switch (status & PN26G0XA_STATUS_ECC_BITMASK) {
74 	case PN26G0XA_STATUS_ECC_NONE_DETECTED:
75 		return 0;
76 
77 	case PN26G0XA_STATUS_ECC_1_7_CORRECTED:
78 		return 7;	/* Return upper limit by convention */
79 
80 	case PN26G0XA_STATUS_ECC_8_CORRECTED:
81 		return 8;
82 
83 	case PN26G0XA_STATUS_ECC_ERRORED:
84 		return -EBADMSG;
85 
86 	default:
87 		break;
88 	}
89 
90 	return -EINVAL;
91 }
92 
93 static const struct mtd_ooblayout_ops pn26g0xa_ooblayout = {
94 	.ecc = pn26g0xa_ooblayout_ecc,
95 	.free = pn26g0xa_ooblayout_free,
96 };
97 
98 
99 static const struct spinand_info paragon_spinand_table[] = {
100 	SPINAND_INFO("PN26G01A",
101 		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xe1),
102 		     NAND_MEMORG(1, 2048, 128, 64, 1024, 21, 1, 1, 1),
103 		     NAND_ECCREQ(8, 512),
104 		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
105 					      &write_cache_variants,
106 					      &update_cache_variants),
107 		     0,
108 		     SPINAND_ECCINFO(&pn26g0xa_ooblayout,
109 				     pn26g0xa_ecc_get_status)),
110 	SPINAND_INFO("PN26G02A",
111 		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xe2),
112 		     NAND_MEMORG(1, 2048, 128, 64, 2048, 41, 1, 1, 1),
113 		     NAND_ECCREQ(8, 512),
114 		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
115 					      &write_cache_variants,
116 					      &update_cache_variants),
117 		     0,
118 		     SPINAND_ECCINFO(&pn26g0xa_ooblayout,
119 				     pn26g0xa_ecc_get_status)),
120 };
121 
122 static const struct spinand_manufacturer_ops paragon_spinand_manuf_ops = {
123 };
124 
125 const struct spinand_manufacturer paragon_spinand_manufacturer = {
126 	.id = SPINAND_MFR_PARAGON,
127 	.name = "Paragon",
128 	.chips = paragon_spinand_table,
129 	.nchips = ARRAY_SIZE(paragon_spinand_table),
130 	.ops = &paragon_spinand_manuf_ops,
131 };
132