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_imx6sx_data = {
  29         .max_ecc_strength_supported = 62,
  30 };
  31
  32 static const struct mxs_nand_dt_data mxs_nand_imx7d_data = {
  33         .max_ecc_strength_supported = 62,
  34 };
  35
  36 static const struct udevice_id mxs_nand_dt_ids[] = {
  37         {
  38                 .compatible = "fsl,imx6q-gpmi-nand",
  39                 .data = (unsigned long)&mxs_nand_imx6q_data,
  40         },
  41         {
  42                 .compatible = "fsl,imx6qp-gpmi-nand",
  43                 .data = (unsigned long)&mxs_nand_imx6q_data,
  44         },
  45         {
  46                 .compatible = "fsl,imx6sx-gpmi-nand",
  47                 .data = (unsigned long)&mxs_nand_imx6sx_data,
  48         },
  49         {
  50                 .compatible = "fsl,imx7d-gpmi-nand",
  51                 .data = (unsigned long)&mxs_nand_imx7d_data,
  52         },
  53         { /* sentinel */ }
  54 };
  55
  56 static int mxs_nand_dt_probe(struct udevice *dev)
  57 {
  58         struct mxs_nand_info *info = dev_get_priv(dev);
  59         const struct mxs_nand_dt_data *data;
  60         struct resource res;
  61         int ret;
  62
  63         data = (void *)dev_get_driver_data(dev);
  64         if (data)
  65                 info->max_ecc_strength_supported = data->max_ecc_strength_supported;
  66
  67         info->dev = dev;
  68
  69         ret = dev_read_resource_byname(dev, "gpmi-nand", &res);
  70         if (ret)
  71                 return ret;
  72
  73         info->gpmi_regs = devm_ioremap(dev, res.start, resource_size(&res));
  74
  75
  76         ret = dev_read_resource_byname(dev, "bch", &res);
  77         if (ret)
  78                 return ret;
  79
  80         info->bch_regs = devm_ioremap(dev, res.start, resource_size(&res));
  81
  82         info->use_minimum_ecc = dev_read_bool(dev, "fsl,use-minimum-ecc");
  83
  84         info->legacy_bch_geometry = dev_read_bool(dev, "fsl,legacy-bch-geometry");
  85
  86         return mxs_nand_init_ctrl(info);
  87 }
  88
  89 U_BOOT_DRIVER(mxs_nand_dt) = {
  90         .name = "mxs-nand-dt",
  91         .id = UCLASS_MTD,
  92         .of_match = mxs_nand_dt_ids,
  93         .probe = mxs_nand_dt_probe,
  94         .priv_auto_alloc_size = sizeof(struct mxs_nand_info),
  95 };
  96
  97 void board_nand_init(void)
  98 {
  99         struct udevice *dev;
 100         int ret;
 101
 102         ret = uclass_get_device_by_driver(UCLASS_MTD,
 103                                           DM_GET_DRIVER(mxs_nand_dt),
 104                                           &dev);
 105         if (ret && ret != -ENODEV)
 106                 pr_err("Failed to initialize MXS NAND controller. (error %d)\n",
 107                        ret);
 108 }