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// 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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