drivers/mtd/nand/raw/mxs_nand_dt.c

   1 /*
   2  * NXP GPMI NAND flash driver (DT initialization)
   3  *
   4  * Copyright (C) 2018 Toradex
   5  * Authors:
   6  * Stefan Agner <stefan.agner@toradex.com>
   7  *
   8  * Based on denali_dt.c
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 #include <dm.h>
  14 #include <linux/io.h>
  15 #include <linux/ioport.h>
  16 #include <linux/printk.h>
  17
  18 #include <mxs_nand.h>
  19
  20 struct mxs_nand_dt_data {
  21         unsigned int max_ecc_strength_supported;
  22 };
  23
  24 static const struct mxs_nand_dt_data mxs_nand_imx6q_data = {
  25         .max_ecc_strength_supported = 40,
  26 };
  27
  28 static const struct mxs_nand_dt_data mxs_nand_imx7d_data = {
  29         .max_ecc_strength_supported = 62,
  30 };
  31
  32 static const struct udevice_id mxs_nand_dt_ids[] = {
  33         {
  34                 .compatible = "fsl,imx6q-gpmi-nand",
  35                 .data = (unsigned long)&mxs_nand_imx6q_data,
  36         },
  37         {
  38                 .compatible = "fsl,imx7d-gpmi-nand",
  39                 .data = (unsigned long)&mxs_nand_imx7d_data,
  40         },
  41         { /* sentinel */ }
  42 };
  43
  44 static int mxs_nand_dt_probe(struct udevice *dev)
  45 {
  46         struct mxs_nand_info *info = dev_get_priv(dev);
  47         const struct mxs_nand_dt_data *data;
  48         struct resource res;
  49         int ret;
  50
  51         data = (void *)dev_get_driver_data(dev);
  52         if (data)
  53                 info->max_ecc_strength_supported = data->max_ecc_strength_supported;
  54
  55         info->dev = dev;
  56
  57         ret = dev_read_resource_byname(dev, "gpmi-nand", &res);
  58         if (ret)
  59                 return ret;
  60
  61         info->gpmi_regs = devm_ioremap(dev, res.start, resource_size(&res));
  62
  63
  64         ret = dev_read_resource_byname(dev, "bch", &res);
  65         if (ret)
  66                 return ret;
  67
  68         info->bch_regs = devm_ioremap(dev, res.start, resource_size(&res));
  69
  70         info->use_minimum_ecc = dev_read_bool(dev, "fsl,use-minimum-ecc");
  71
  72         info->legacy_bch_geometry = dev_read_bool(dev, "fsl,legacy-bch-geometry");
  73
  74         return mxs_nand_init_ctrl(info);
  75 }
  76
  77 U_BOOT_DRIVER(mxs_nand_dt) = {
  78         .name = "mxs-nand-dt",
  79         .id = UCLASS_MTD,
  80         .of_match = mxs_nand_dt_ids,
  81         .probe = mxs_nand_dt_probe,
  82         .priv_auto_alloc_size = sizeof(struct mxs_nand_info),
  83 };
  84
  85 void board_nand_init(void)
  86 {
  87         struct udevice *dev;
  88         int ret;
  89
  90         ret = uclass_get_device_by_driver(UCLASS_MTD,
  91                                           DM_GET_DRIVER(mxs_nand_dt),
  92                                           &dev);
  93         if (ret && ret != -ENODEV)
  94                 pr_err("Failed to initialize MXS NAND controller. (error %d)\n",
  95                        ret);
  96 }