drivers/mtd/nand/raw/nand_jedec.c

   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 #define JEDEC_PARAM_PAGES 3
  20
  21 /*
  22  * Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise.
  23  */
  24 int 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                 else
  60                         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         memorg->pagesize = le32_to_cpu(p->byte_per_page);
  98         mtd->writesize = memorg->pagesize;
  99
 100         /* Please reference to the comment for nand_flash_detect_onfi. */
 101         memorg->pages_per_eraseblock =
 102                         1 << (fls(le32_to_cpu(p->pages_per_block)) - 1);
 103         mtd->erasesize = memorg->pages_per_eraseblock * memorg->pagesize;
 104
 105         memorg->oobsize = le16_to_cpu(p->spare_bytes_per_page);
 106         mtd->oobsize = memorg->oobsize;
 107
 108         memorg->luns_per_target = p->lun_count;
 109         memorg->planes_per_lun = 1 << p->multi_plane_addr;
 110
 111         /* Please reference to the comment for nand_flash_detect_onfi. */
 112         memorg->eraseblocks_per_lun =
 113                 1 << (fls(le32_to_cpu(p->blocks_per_lun)) - 1);
 114         memorg->bits_per_cell = p->bits_per_cell;
 115
 116         if (le16_to_cpu(p->features) & JEDEC_FEATURE_16_BIT_BUS)
 117                 chip->options |= NAND_BUSWIDTH_16;
 118
 119         /* ECC info */
 120         ecc = &p->ecc_info[0];
 121
 122         if (ecc->codeword_size >= 9) {
 123                 struct nand_ecc_props requirements = {
 124                         .strength = ecc->ecc_bits,
 125                         .step_size = 1 << ecc->codeword_size,
 126                 };
 127
 128                 nanddev_set_ecc_requirements(base, &requirements);
 129         } else {
 130                 pr_warn("Invalid codeword size\n");
 131         }
 132
 133         ret = 1;
 134
 135 free_jedec_param_page:
 136         kfree(p);
 137         return ret;
 138 }