Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Boris Brezillon | 514 | 100.00% | 1 | 100.00% |
Total | 514 | 1 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) * 2002-2006 Thomas Gleixner (tglx@linutronix.de) * * Credits: * David Woodhouse for adding multichip support * * Aleph One Ltd. and Toby Churchill Ltd. for supporting the * rework for 2K page size chips * * This file contains all ONFI helpers. */ #include <linux/slab.h> #include "internals.h" /* * Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise. */ int nand_jedec_detect(struct nand_chip *chip) { struct mtd_info *mtd = nand_to_mtd(chip); struct nand_jedec_params *p; struct jedec_ecc_info *ecc; int jedec_version = 0; char id[5]; int i, val, ret; /* Try JEDEC for unknown chip or LP */ ret = nand_readid_op(chip, 0x40, id, sizeof(id)); if (ret || strncmp(id, "JEDEC", sizeof(id))) return 0; /* JEDEC chip: allocate a buffer to hold its parameter page */ p = kzalloc(sizeof(*p), GFP_KERNEL); if (!p) return -ENOMEM; ret = nand_read_param_page_op(chip, 0x40, NULL, 0); if (ret) { ret = 0; goto free_jedec_param_page; } for (i = 0; i < 3; i++) { ret = nand_read_data_op(chip, p, sizeof(*p), true); if (ret) { ret = 0; goto free_jedec_param_page; } if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 510) == le16_to_cpu(p->crc)) break; } if (i == 3) { pr_err("Could not find valid JEDEC parameter page; aborting\n"); goto free_jedec_param_page; } /* Check version */ val = le16_to_cpu(p->revision); if (val & (1 << 2)) jedec_version = 10; else if (val & (1 << 1)) jedec_version = 1; /* vendor specific version */ if (!jedec_version) { pr_info("unsupported JEDEC version: %d\n", val); goto free_jedec_param_page; } sanitize_string(p->manufacturer, sizeof(p->manufacturer)); sanitize_string(p->model, sizeof(p->model)); chip->parameters.model = kstrdup(p->model, GFP_KERNEL); if (!chip->parameters.model) { ret = -ENOMEM; goto free_jedec_param_page; } mtd->writesize = le32_to_cpu(p->byte_per_page); /* Please reference to the comment for nand_flash_detect_onfi. */ mtd->erasesize = 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1); mtd->erasesize *= mtd->writesize; mtd->oobsize = le16_to_cpu(p->spare_bytes_per_page); /* Please reference to the comment for nand_flash_detect_onfi. */ chip->chipsize = 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1); chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count; chip->bits_per_cell = p->bits_per_cell; if (le16_to_cpu(p->features) & JEDEC_FEATURE_16_BIT_BUS) chip->options |= NAND_BUSWIDTH_16; /* ECC info */ ecc = &p->ecc_info[0]; if (ecc->codeword_size >= 9) { chip->ecc_strength_ds = ecc->ecc_bits; chip->ecc_step_ds = 1 << ecc->codeword_size; } else { pr_warn("Invalid codeword size\n"); } free_jedec_param_page: kfree(p); return ret; }
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