drivers/mtd/nand/raw/nand_jedec.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright (C) 2000 Steven J. Hill ([email protected])
   4  *                2002-2006 Thomas Gleixner ([email protected])
   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_jedec_params *p;
  26         struct jedec_ecc_info *ecc;
  27         int jedec_version = 0;
  28         char id[5];
  29         int i, val, ret;
  30
  31         /* Try JEDEC for unknown chip or LP */
  32         ret = nand_readid_op(chip, 0x40, id, sizeof(id));
  33         if (ret || strncmp(id, "JEDEC", sizeof(id)))
  34                 return 0;
  35
  36         /* JEDEC chip: allocate a buffer to hold its parameter page */
  37         p = kzalloc(sizeof(*p), GFP_KERNEL);
  38         if (!p)
  39                 return -ENOMEM;
  40
  41         ret = nand_read_param_page_op(chip, 0x40, NULL, 0);
  42         if (ret) {
  43                 ret = 0;
  44                 goto free_jedec_param_page;
  45         }
  46
  47         for (i = 0; i < 3; i++) {
  48                 ret = nand_read_data_op(chip, p, sizeof(*p), true);
  49                 if (ret) {
  50                         ret = 0;
  51                         goto free_jedec_param_page;
  52                 }
  53
  54                 if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 510) ==
  55                                 le16_to_cpu(p->crc))
  56                         break;
  57         }
  58
  59         if (i == 3) {
  60                 pr_err("Could not find valid JEDEC parameter page; aborting\n");
  61                 goto free_jedec_param_page;
  62         }
  63
  64         /* Check version */
  65         val = le16_to_cpu(p->revision);
  66         if (val & (1 << 2))
  67                 jedec_version = 10;
  68         else if (val & (1 << 1))
  69                 jedec_version = 1; /* vendor specific version */
  70
  71         if (!jedec_version) {
  72                 pr_info("unsupported JEDEC version: %d\n", val);
  73                 goto free_jedec_param_page;
  74         }
  75
  76         sanitize_string(p->manufacturer, sizeof(p->manufacturer));
  77         sanitize_string(p->model, sizeof(p->model));
  78         chip->parameters.model = kstrdup(p->model, GFP_KERNEL);
  79         if (!chip->parameters.model) {
  80                 ret = -ENOMEM;
  81                 goto free_jedec_param_page;
  82         }
  83
  84         mtd->writesize = le32_to_cpu(p->byte_per_page);
  85
  86         /* Please reference to the comment for nand_flash_detect_onfi. */
  87         mtd->erasesize = 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1);
  88         mtd->erasesize *= mtd->writesize;
  89
  90         mtd->oobsize = le16_to_cpu(p->spare_bytes_per_page);
  91
  92         /* Please reference to the comment for nand_flash_detect_onfi. */
  93         chip->chipsize = 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1);
  94         chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;
  95         chip->bits_per_cell = p->bits_per_cell;
  96
  97         if (le16_to_cpu(p->features) & JEDEC_FEATURE_16_BIT_BUS)
  98                 chip->options |= NAND_BUSWIDTH_16;
  99
 100         /* ECC info */
 101         ecc = &p->ecc_info[0];
 102
 103         if (ecc->codeword_size >= 9) {
 104                 chip->ecc_strength_ds = ecc->ecc_bits;
 105                 chip->ecc_step_ds = 1 << ecc->codeword_size;
 106         } else {
 107                 pr_warn("Invalid codeword size\n");
 108         }
 109
 110         ret = 1;
 111
 112 free_jedec_param_page:
 113         kfree(p);
 114         return ret;
 115 }