drivers/mtd/nand/denali_dt.c

   1 /*
   2  * NAND Flash Controller Device Driver for DT
   3  *
   4  * Copyright © 2011, Picochip.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #include <linux/clk.h>
  17 #include <linux/err.h>
  18 #include <linux/io.h>
  19 #include <linux/ioport.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/platform_device.h>
  25
  26 #include "denali.h"
  27
  28 struct denali_dt {
  29         struct denali_nand_info denali;
  30         struct clk              *clk;
  31 };
  32
  33 struct denali_dt_data {
  34         unsigned int revision;
  35         unsigned int caps;
  36         const struct nand_ecc_caps *ecc_caps;
  37 };
  38
  39 NAND_ECC_CAPS_SINGLE(denali_socfpga_ecc_caps, denali_calc_ecc_bytes,
  40                      512, 8, 15);
  41 static const struct denali_dt_data denali_socfpga_data = {
  42         .caps = DENALI_CAP_HW_ECC_FIXUP,
  43         .ecc_caps = &denali_socfpga_ecc_caps,
  44 };
  45
  46 NAND_ECC_CAPS_SINGLE(denali_uniphier_v5a_ecc_caps, denali_calc_ecc_bytes,
  47                      1024, 8, 16, 24);
  48 static const struct denali_dt_data denali_uniphier_v5a_data = {
  49         .caps = DENALI_CAP_HW_ECC_FIXUP |
  50                 DENALI_CAP_DMA_64BIT,
  51         .ecc_caps = &denali_uniphier_v5a_ecc_caps,
  52 };
  53
  54 NAND_ECC_CAPS_SINGLE(denali_uniphier_v5b_ecc_caps, denali_calc_ecc_bytes,
  55                      1024, 8, 16);
  56 static const struct denali_dt_data denali_uniphier_v5b_data = {
  57         .revision = 0x0501,
  58         .caps = DENALI_CAP_HW_ECC_FIXUP |
  59                 DENALI_CAP_DMA_64BIT,
  60         .ecc_caps = &denali_uniphier_v5b_ecc_caps,
  61 };
  62
  63 static const struct of_device_id denali_nand_dt_ids[] = {
  64         {
  65                 .compatible = "altr,socfpga-denali-nand",
  66                 .data = &denali_socfpga_data,
  67         },
  68         {
  69                 .compatible = "socionext,uniphier-denali-nand-v5a",
  70                 .data = &denali_uniphier_v5a_data,
  71         },
  72         {
  73                 .compatible = "socionext,uniphier-denali-nand-v5b",
  74                 .data = &denali_uniphier_v5b_data,
  75         },
  76         { /* sentinel */ }
  77 };
  78 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
  79
  80 static int denali_dt_probe(struct platform_device *pdev)
  81 {
  82         struct resource *res;
  83         struct denali_dt *dt;
  84         const struct denali_dt_data *data;
  85         struct denali_nand_info *denali;
  86         int ret;
  87
  88         dt = devm_kzalloc(&pdev->dev, sizeof(*dt), GFP_KERNEL);
  89         if (!dt)
  90                 return -ENOMEM;
  91         denali = &dt->denali;
  92
  93         data = of_device_get_match_data(&pdev->dev);
  94         if (data) {
  95                 denali->revision = data->revision;
  96                 denali->caps = data->caps;
  97                 denali->ecc_caps = data->ecc_caps;
  98         }
  99
 100         denali->dev = &pdev->dev;
 101         denali->irq = platform_get_irq(pdev, 0);
 102         if (denali->irq < 0) {
 103                 dev_err(&pdev->dev, "no irq defined\n");
 104                 return denali->irq;
 105         }
 106
 107         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "denali_reg");
 108         denali->reg = devm_ioremap_resource(&pdev->dev, res);
 109         if (IS_ERR(denali->reg))
 110                 return PTR_ERR(denali->reg);
 111
 112         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
 113         denali->host = devm_ioremap_resource(&pdev->dev, res);
 114         if (IS_ERR(denali->host))
 115                 return PTR_ERR(denali->host);
 116
 117         dt->clk = devm_clk_get(&pdev->dev, NULL);
 118         if (IS_ERR(dt->clk)) {
 119                 dev_err(&pdev->dev, "no clk available\n");
 120                 return PTR_ERR(dt->clk);
 121         }
 122         ret = clk_prepare_enable(dt->clk);
 123         if (ret)
 124                 return ret;
 125
 126         denali->clk_x_rate = clk_get_rate(dt->clk);
 127
 128         ret = denali_init(denali);
 129         if (ret)
 130                 goto out_disable_clk;
 131
 132         platform_set_drvdata(pdev, dt);
 133         return 0;
 134
 135 out_disable_clk:
 136         clk_disable_unprepare(dt->clk);
 137
 138         return ret;
 139 }
 140
 141 static int denali_dt_remove(struct platform_device *pdev)
 142 {
 143         struct denali_dt *dt = platform_get_drvdata(pdev);
 144
 145         denali_remove(&dt->denali);
 146         clk_disable_unprepare(dt->clk);
 147
 148         return 0;
 149 }
 150
 151 static struct platform_driver denali_dt_driver = {
 152         .probe          = denali_dt_probe,
 153         .remove         = denali_dt_remove,
 154         .driver         = {
 155                 .name   = "denali-nand-dt",
 156                 .of_match_table = denali_nand_dt_ids,
 157         },
 158 };
 159 module_platform_driver(denali_dt_driver);
 160
 161 MODULE_LICENSE("GPL");
 162 MODULE_AUTHOR("Jamie Iles");
 163 MODULE_DESCRIPTION("DT driver for Denali NAND controller");