xref: /openbmc/linux/drivers/mtd/nand/spi/ato.c (revision fc602b4f)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2022 Aidan MacDonald
4  *
5  * Author: Aidan MacDonald <aidanmacdonald.0x0@gmail.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_ATO		0x9b
14 
15 
16 static SPINAND_OP_VARIANTS(read_cache_variants,
17 		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
18 		SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
19 		SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
20 
21 static SPINAND_OP_VARIANTS(write_cache_variants,
22 		SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
23 		SPINAND_PROG_LOAD(true, 0, NULL, 0));
24 
25 static SPINAND_OP_VARIANTS(update_cache_variants,
26 		SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
27 		SPINAND_PROG_LOAD(false, 0, NULL, 0));
28 
29 
ato25d1ga_ooblayout_ecc(struct mtd_info * mtd,int section,struct mtd_oob_region * region)30 static int ato25d1ga_ooblayout_ecc(struct mtd_info *mtd, int section,
31 				   struct mtd_oob_region *region)
32 {
33 	if (section > 3)
34 		return -ERANGE;
35 
36 	region->offset = (16 * section) + 8;
37 	region->length = 8;
38 	return 0;
39 }
40 
ato25d1ga_ooblayout_free(struct mtd_info * mtd,int section,struct mtd_oob_region * region)41 static int ato25d1ga_ooblayout_free(struct mtd_info *mtd, int section,
42 				   struct mtd_oob_region *region)
43 {
44 	if (section > 3)
45 		return -ERANGE;
46 
47 	if (section) {
48 		region->offset = (16 * section);
49 		region->length = 8;
50 	} else {
51 		/* first byte of section 0 is reserved for the BBM */
52 		region->offset = 1;
53 		region->length = 7;
54 	}
55 
56 	return 0;
57 }
58 
59 static const struct mtd_ooblayout_ops ato25d1ga_ooblayout = {
60 	.ecc = ato25d1ga_ooblayout_ecc,
61 	.free = ato25d1ga_ooblayout_free,
62 };
63 
64 
65 static const struct spinand_info ato_spinand_table[] = {
66 	SPINAND_INFO("ATO25D1GA",
67 		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x12),
68 		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
69 		     NAND_ECCREQ(1, 512),
70 		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
71 					      &write_cache_variants,
72 					      &update_cache_variants),
73 		     SPINAND_HAS_QE_BIT,
74 		     SPINAND_ECCINFO(&ato25d1ga_ooblayout, NULL)),
75 };
76 
77 static const struct spinand_manufacturer_ops ato_spinand_manuf_ops = {
78 };
79 
80 const struct spinand_manufacturer ato_spinand_manufacturer = {
81 	.id = SPINAND_MFR_ATO,
82 	.name = "ATO",
83 	.chips = ato_spinand_table,
84 	.nchips = ARRAY_SIZE(ato_spinand_table),
85 	.ops = &ato_spinand_manuf_ops,
86 };
87