1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
4 * 2002-2006 Thomas Gleixner (tglx@linutronix.de)
5 *
6 * Credits:
7 * David Woodhouse for adding multichip support
8 *
9 * Aleph One Ltd. and Toby Churchill Ltd. for supporting the
10 * rework for 2K page size chips
11 *
12 * This file contains all ONFI helpers.
13 */
14
15 #include <linux/slab.h>
16
17 #include "internals.h"
18
19 #define JEDEC_PARAM_PAGES 3
20
21 /*
22 * Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise.
23 */
nand_jedec_detect(struct nand_chip * chip)24 int nand_jedec_detect(struct nand_chip *chip)
25 {
26 struct nand_device *base = &chip->base;
27 struct mtd_info *mtd = nand_to_mtd(chip);
28 struct nand_memory_organization *memorg;
29 struct nand_jedec_params *p;
30 struct jedec_ecc_info *ecc;
31 bool use_datain = false;
32 int jedec_version = 0;
33 char id[5];
34 int i, val, ret;
35 u16 crc;
36
37 memorg = nanddev_get_memorg(&chip->base);
38
39 /* Try JEDEC for unknown chip or LP */
40 ret = nand_readid_op(chip, 0x40, id, sizeof(id));
41 if (ret || strncmp(id, "JEDEC", sizeof(id)))
42 return 0;
43
44 /* JEDEC chip: allocate a buffer to hold its parameter page */
45 p = kzalloc(sizeof(*p), GFP_KERNEL);
46 if (!p)
47 return -ENOMEM;
48
49 if (!nand_has_exec_op(chip) ||
50 !nand_read_data_op(chip, p, sizeof(*p), true, true))
51 use_datain = true;
52
53 for (i = 0; i < JEDEC_PARAM_PAGES; i++) {
54 if (!i)
55 ret = nand_read_param_page_op(chip, 0x40, p,
56 sizeof(*p));
57 else if (use_datain)
58 ret = nand_read_data_op(chip, p, sizeof(*p), true,
59 false);
60 else
61 ret = nand_change_read_column_op(chip, sizeof(*p) * i,
62 p, sizeof(*p), true);
63 if (ret) {
64 ret = 0;
65 goto free_jedec_param_page;
66 }
67
68 crc = onfi_crc16(ONFI_CRC_BASE, (u8 *)p, 510);
69 if (crc == le16_to_cpu(p->crc))
70 break;
71 }
72
73 if (i == JEDEC_PARAM_PAGES) {
74 pr_err("Could not find valid JEDEC parameter page; aborting\n");
75 goto free_jedec_param_page;
76 }
77
78 /* Check version */
79 val = le16_to_cpu(p->revision);
80 if (val & (1 << 2))
81 jedec_version = 10;
82 else if (val & (1 << 1))
83 jedec_version = 1; /* vendor specific version */
84
85 if (!jedec_version) {
86 pr_info("unsupported JEDEC version: %d\n", val);
87 goto free_jedec_param_page;
88 }
89
90 sanitize_string(p->manufacturer, sizeof(p->manufacturer));
91 sanitize_string(p->model, sizeof(p->model));
92 chip->parameters.model = kstrdup(p->model, GFP_KERNEL);
93 if (!chip->parameters.model) {
94 ret = -ENOMEM;
95 goto free_jedec_param_page;
96 }
97
98 memorg->pagesize = le32_to_cpu(p->byte_per_page);
99 mtd->writesize = memorg->pagesize;
100
101 /* Please reference to the comment for nand_flash_detect_onfi. */
102 memorg->pages_per_eraseblock =
103 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1);
104 mtd->erasesize = memorg->pages_per_eraseblock * memorg->pagesize;
105
106 memorg->oobsize = le16_to_cpu(p->spare_bytes_per_page);
107 mtd->oobsize = memorg->oobsize;
108
109 memorg->luns_per_target = p->lun_count;
110 memorg->planes_per_lun = 1 << p->multi_plane_addr;
111
112 /* Please reference to the comment for nand_flash_detect_onfi. */
113 memorg->eraseblocks_per_lun =
114 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1);
115 memorg->bits_per_cell = p->bits_per_cell;
116
117 if (le16_to_cpu(p->features) & JEDEC_FEATURE_16_BIT_BUS)
118 chip->options |= NAND_BUSWIDTH_16;
119
120 /* ECC info */
121 ecc = &p->ecc_info[0];
122
123 if (ecc->codeword_size >= 9) {
124 struct nand_ecc_props requirements = {
125 .strength = ecc->ecc_bits,
126 .step_size = 1 << ecc->codeword_size,
127 };
128
129 nanddev_set_ecc_requirements(base, &requirements);
130 } else {
131 pr_warn("Invalid codeword size\n");
132 }
133
134 ret = 1;
135
136 free_jedec_param_page:
137 kfree(p);
138 return ret;
139 }
140