drivers/mtd/nand/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_imx7d_data = {
  25         .max_ecc_strength_supported = 62,
  26 };
  27
  28 static const struct udevice_id mxs_nand_dt_ids[] = {
  29         {
  30                 .compatible = "fsl,imx7d-gpmi-nand",
  31                 .data = (unsigned long)&mxs_nand_imx7d_data,
  32         },
  33         { /* sentinel */ }
  34 };
  35
  36 static int mxs_nand_dt_probe(struct udevice *dev)
  37 {
  38         struct mxs_nand_info *info = dev_get_priv(dev);
  39         const struct mxs_nand_dt_data *data;
  40         struct resource res;
  41         int ret;
  42
  43         data = (void *)dev_get_driver_data(dev);
  44         if (data)
  45                 info->max_ecc_strength_supported = data->max_ecc_strength_supported;
  46
  47         info->dev = dev;
  48
  49         ret = dev_read_resource_byname(dev, "gpmi-nand", &res);
  50         if (ret)
  51                 return ret;
  52
  53         info->gpmi_regs = devm_ioremap(dev, res.start, resource_size(&res));
  54
  55
  56         ret = dev_read_resource_byname(dev, "bch", &res);
  57         if (ret)
  58                 return ret;
  59
  60         info->bch_regs = devm_ioremap(dev, res.start, resource_size(&res));
  61
  62         info->use_minimum_ecc = dev_read_bool(dev, "fsl,use-minimum-ecc");
  63
  64         return mxs_nand_init_ctrl(info);
  65 }
  66
  67 U_BOOT_DRIVER(mxs_nand_dt) = {
  68         .name = "mxs-nand-dt",
  69         .id = UCLASS_MTD,
  70         .of_match = mxs_nand_dt_ids,
  71         .probe = mxs_nand_dt_probe,
  72         .priv_auto_alloc_size = sizeof(struct mxs_nand_info),
  73 };
  74
  75 void board_nand_init(void)
  76 {
  77         struct udevice *dev;
  78         int ret;
  79
  80         ret = uclass_get_device_by_driver(UCLASS_MTD,
  81                                           DM_GET_DRIVER(mxs_nand_dt),
  82                                           &dev);
  83         if (ret && ret != -ENODEV)
  84                 pr_err("Failed to initialize MXS NAND controller. (error %d)\n",
  85                        ret);
  86 }