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 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/io.h>
  18 #include <linux/ioport.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24
  25 #include "denali.h"
  26
  27 struct denali_dt {
  28         struct denali_nand_info denali;
  29         struct clk              *clk;
  30 };
  31
  32 struct denali_dt_data {
  33         unsigned int revision;
  34         unsigned int caps;
  35         const struct nand_ecc_caps *ecc_caps;
  36 };
  37
  38 NAND_ECC_CAPS_SINGLE(denali_socfpga_ecc_caps, denali_calc_ecc_bytes,
  39                      512, 8, 15);
  40 static const struct denali_dt_data denali_socfpga_data = {
  41         .caps = DENALI_CAP_HW_ECC_FIXUP,
  42         .ecc_caps = &denali_socfpga_ecc_caps,
  43 };
  44
  45 NAND_ECC_CAPS_SINGLE(denali_uniphier_v5a_ecc_caps, denali_calc_ecc_bytes,
  46                      1024, 8, 16, 24);
  47 static const struct denali_dt_data denali_uniphier_v5a_data = {
  48         .caps = DENALI_CAP_HW_ECC_FIXUP |
  49                 DENALI_CAP_DMA_64BIT,
  50         .ecc_caps = &denali_uniphier_v5a_ecc_caps,
  51 };
  52
  53 NAND_ECC_CAPS_SINGLE(denali_uniphier_v5b_ecc_caps, denali_calc_ecc_bytes,
  54                      1024, 8, 16);
  55 static const struct denali_dt_data denali_uniphier_v5b_data = {
  56         .revision = 0x0501,
  57         .caps = DENALI_CAP_HW_ECC_FIXUP |
  58                 DENALI_CAP_DMA_64BIT,
  59         .ecc_caps = &denali_uniphier_v5b_ecc_caps,
  60 };
  61
  62 static const struct of_device_id denali_nand_dt_ids[] = {
  63         {
  64                 .compatible = "altr,socfpga-denali-nand",
  65                 .data = &denali_socfpga_data,
  66         },
  67         {
  68                 .compatible = "socionext,uniphier-denali-nand-v5a",
  69                 .data = &denali_uniphier_v5a_data,
  70         },
  71         {
  72                 .compatible = "socionext,uniphier-denali-nand-v5b",
  73                 .data = &denali_uniphier_v5b_data,
  74         },
  75         { /* sentinel */ }
  76 };
  77 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
  78
  79 static int denali_dt_probe(struct platform_device *pdev)
  80 {
  81         struct resource *res;
  82         struct denali_dt *dt;
  83         const struct denali_dt_data *data;
  84         struct denali_nand_info *denali;
  85         int ret;
  86
  87         dt = devm_kzalloc(&pdev->dev, sizeof(*dt), GFP_KERNEL);
  88         if (!dt)
  89                 return -ENOMEM;
  90         denali = &dt->denali;
  91
  92         data = of_device_get_match_data(&pdev->dev);
  93         if (data) {
  94                 denali->revision = data->revision;
  95                 denali->caps = data->caps;
  96                 denali->ecc_caps = data->ecc_caps;
  97         }
  98
  99         denali->dev = &pdev->dev;
 100         denali->irq = platform_get_irq(pdev, 0);
 101         if (denali->irq < 0) {
 102                 dev_err(&pdev->dev, "no irq defined\n");
 103                 return denali->irq;
 104         }
 105
 106         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "denali_reg");
 107         denali->reg = devm_ioremap_resource(&pdev->dev, res);
 108         if (IS_ERR(denali->reg))
 109                 return PTR_ERR(denali->reg);
 110
 111         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
 112         denali->host = devm_ioremap_resource(&pdev->dev, res);
 113         if (IS_ERR(denali->host))
 114                 return PTR_ERR(denali->host);
 115
 116         dt->clk = devm_clk_get(&pdev->dev, NULL);
 117         if (IS_ERR(dt->clk)) {
 118                 dev_err(&pdev->dev, "no clk available\n");
 119                 return PTR_ERR(dt->clk);
 120         }
 121         clk_prepare_enable(dt->clk);
 122
 123         denali->clk_x_rate = clk_get_rate(dt->clk);
 124
 125         ret = denali_init(denali);
 126         if (ret)
 127                 goto out_disable_clk;
 128
 129         platform_set_drvdata(pdev, dt);
 130         return 0;
 131
 132 out_disable_clk:
 133         clk_disable_unprepare(dt->clk);
 134
 135         return ret;
 136 }
 137
 138 static int denali_dt_remove(struct platform_device *pdev)
 139 {
 140         struct denali_dt *dt = platform_get_drvdata(pdev);
 141
 142         denali_remove(&dt->denali);
 143         clk_disable_unprepare(dt->clk);
 144
 145         return 0;
 146 }
 147
 148 static struct platform_driver denali_dt_driver = {
 149         .probe          = denali_dt_probe,
 150         .remove         = denali_dt_remove,
 151         .driver         = {
 152                 .name   = "denali-nand-dt",
 153                 .of_match_table = denali_nand_dt_ids,
 154         },
 155 };
 156
 157 module_platform_driver(denali_dt_driver);
 158
 159 MODULE_LICENSE("GPL");
 160 MODULE_AUTHOR("Jamie Iles");
 161 MODULE_DESCRIPTION("DT driver for Denali NAND controller");