| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | /* |
| 20 | * Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise. |
| 21 | */ |
| 22 | int nand_jedec_detect(struct nand_chip *chip) |
| 23 | { |
| 24 | struct mtd_info *mtd = nand_to_mtd(chip); |
| 25 | struct nand_memory_organization *memorg; |
| 26 | struct nand_jedec_params *p; |
| 27 | struct jedec_ecc_info *ecc; |
| 28 | int jedec_version = 0; |
| 29 | char id[5]; |
| 30 | int i, val, ret; |
| 31 | |
| 32 | memorg = nanddev_get_memorg(&chip->base); |
| 33 | |
| 34 | /* Try JEDEC for unknown chip or LP */ |
| 35 | ret = nand_readid_op(chip, 0x40, id, sizeof(id)); |
| 36 | if (ret || strncmp(id, "JEDEC", sizeof(id))) |
| 37 | return 0; |
| 38 | |
| 39 | /* JEDEC chip: allocate a buffer to hold its parameter page */ |
| 40 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
| 41 | if (!p) |
| 42 | return -ENOMEM; |
| 43 | |
| 44 | ret = nand_read_param_page_op(chip, 0x40, NULL, 0); |
| 45 | if (ret) { |
| 46 | ret = 0; |
| 47 | goto free_jedec_param_page; |
| 48 | } |
| 49 | |
| 50 | for (i = 0; i < 3; i++) { |
| 51 | ret = nand_read_data_op(chip, p, sizeof(*p), true); |
| 52 | if (ret) { |
| 53 | ret = 0; |
| 54 | goto free_jedec_param_page; |
| 55 | } |
| 56 | |
| 57 | if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 510) == |
| 58 | le16_to_cpu(p->crc)) |
| 59 | break; |
| 60 | } |
| 61 | |
| 62 | if (i == 3) { |
| 63 | pr_err("Could not find valid JEDEC parameter page; aborting\n"); |
| 64 | goto free_jedec_param_page; |
| 65 | } |
| 66 | |
| 67 | /* Check version */ |
| 68 | val = le16_to_cpu(p->revision); |
| 69 | if (val & (1 << 2)) |
| 70 | jedec_version = 10; |
| 71 | else if (val & (1 << 1)) |
| 72 | jedec_version = 1; /* vendor specific version */ |
| 73 | |
| 74 | if (!jedec_version) { |
| 75 | pr_info("unsupported JEDEC version: %d\n", val); |
| 76 | goto free_jedec_param_page; |
| 77 | } |
| 78 | |
| 79 | sanitize_string(p->manufacturer, sizeof(p->manufacturer)); |
| 80 | sanitize_string(p->model, sizeof(p->model)); |
| 81 | chip->parameters.model = kstrdup(p->model, GFP_KERNEL); |
| 82 | if (!chip->parameters.model) { |
| 83 | ret = -ENOMEM; |
| 84 | goto free_jedec_param_page; |
| 85 | } |
| 86 | |
| 87 | memorg->pagesize = le32_to_cpu(p->byte_per_page); |
| 88 | mtd->writesize = memorg->pagesize; |
| 89 | |
| 90 | /* Please reference to the comment for nand_flash_detect_onfi. */ |
| 91 | memorg->pages_per_eraseblock = |
| 92 | 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1); |
| 93 | mtd->erasesize = memorg->pages_per_eraseblock * memorg->pagesize; |
| 94 | |
| 95 | memorg->oobsize = le16_to_cpu(p->spare_bytes_per_page); |
| 96 | mtd->oobsize = memorg->oobsize; |
| 97 | |
| 98 | memorg->luns_per_target = p->lun_count; |
| 99 | memorg->planes_per_lun = 1 << p->multi_plane_addr; |
| 100 | |
| 101 | /* Please reference to the comment for nand_flash_detect_onfi. */ |
| 102 | memorg->eraseblocks_per_lun = |
| 103 | 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1); |
| 104 | memorg->bits_per_cell = p->bits_per_cell; |
| 105 | |
| 106 | if (le16_to_cpu(p->features) & JEDEC_FEATURE_16_BIT_BUS) |
| 107 | chip->options |= NAND_BUSWIDTH_16; |
| 108 | |
| 109 | /* ECC info */ |
| 110 | ecc = &p->ecc_info[0]; |
| 111 | |
| 112 | if (ecc->codeword_size >= 9) { |
| 113 | chip->base.eccreq.strength = ecc->ecc_bits; |
| 114 | chip->base.eccreq.step_size = 1 << ecc->codeword_size; |
| 115 | } else { |
| 116 | pr_warn("Invalid codeword size\n"); |
| 117 | } |
| 118 | |
| 119 | ret = 1; |
| 120 | |
| 121 | free_jedec_param_page: |
| 122 | kfree(p); |
| 123 | return ret; |
| 124 | } |