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1// SPDX-License-Identifier: GPL-2.02/*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 support8 *9 * Aleph One Ltd. and Toby Churchill Ltd. for supporting the10 * rework for 2K page size chips11 *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 320 21/*22 * Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise.23 */24int 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) || chip->controller->supported_op.data_only_read)50 use_datain = true;51 52 for (i = 0; i < JEDEC_PARAM_PAGES; i++) {53 if (!i)54 ret = nand_read_param_page_op(chip, 0x40, p,55 sizeof(*p));56 else if (use_datain)57 ret = nand_read_data_op(chip, p, sizeof(*p), true,58 false);59 else60 ret = nand_change_read_column_op(chip, sizeof(*p) * i,61 p, sizeof(*p), true);62 if (ret) {63 ret = 0;64 goto free_jedec_param_page;65 }66 67 crc = onfi_crc16(ONFI_CRC_BASE, (u8 *)p, 510);68 if (crc == le16_to_cpu(p->crc))69 break;70 }71 72 if (i == JEDEC_PARAM_PAGES) {73 pr_err("Could not find valid JEDEC parameter page; aborting\n");74 goto free_jedec_param_page;75 }76 77 /* Check version */78 val = le16_to_cpu(p->revision);79 if (val & (1 << 2))80 jedec_version = 10;81 else if (val & (1 << 1))82 jedec_version = 1; /* vendor specific version */83 84 if (!jedec_version) {85 pr_info("unsupported JEDEC version: %d\n", val);86 goto free_jedec_param_page;87 }88 89 sanitize_string(p->manufacturer, sizeof(p->manufacturer));90 sanitize_string(p->model, sizeof(p->model));91 chip->parameters.model = kstrdup(p->model, GFP_KERNEL);92 if (!chip->parameters.model) {93 ret = -ENOMEM;94 goto free_jedec_param_page;95 }96 97 if (p->opt_cmd[0] & JEDEC_OPT_CMD_READ_CACHE)98 chip->parameters.supports_read_cache = true;99 100 memorg->pagesize = le32_to_cpu(p->byte_per_page);101 mtd->writesize = memorg->pagesize;102 103 /* Please reference to the comment for nand_flash_detect_onfi. */104 memorg->pages_per_eraseblock =105 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1);106 mtd->erasesize = memorg->pages_per_eraseblock * memorg->pagesize;107 108 memorg->oobsize = le16_to_cpu(p->spare_bytes_per_page);109 mtd->oobsize = memorg->oobsize;110 111 memorg->luns_per_target = p->lun_count;112 memorg->planes_per_lun = 1 << p->multi_plane_addr;113 114 /* Please reference to the comment for nand_flash_detect_onfi. */115 memorg->eraseblocks_per_lun =116 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1);117 memorg->bits_per_cell = p->bits_per_cell;118 119 if (le16_to_cpu(p->features) & JEDEC_FEATURE_16_BIT_BUS)120 chip->options |= NAND_BUSWIDTH_16;121 122 /* ECC info */123 ecc = &p->ecc_info[0];124 125 if (ecc->codeword_size >= 9) {126 struct nand_ecc_props requirements = {127 .strength = ecc->ecc_bits,128 .step_size = 1 << ecc->codeword_size,129 };130 131 nanddev_set_ecc_requirements(base, &requirements);132 } else {133 pr_warn("Invalid codeword size\n");134 }135 136 ret = 1;137 138free_jedec_param_page:139 kfree(p);140 return ret;141}142