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 static const struct of_device_id denali_nand_dt_ids[] = {
  33                 { .compatible = "denali,denali-nand-dt" },
  34                 { /* sentinel */ }
  35         };
  36
  37 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
  38
  39 static u64 denali_dma_mask;
  40
  41 static int denali_dt_probe(struct platform_device *ofdev)
  42 {
  43         struct resource *denali_reg, *nand_data;
  44         struct denali_dt *dt;
  45         struct denali_nand_info *denali;
  46         int ret;
  47         const struct of_device_id *of_id;
  48
  49         of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
  50         if (of_id) {
  51                 ofdev->id_entry = of_id->data;
  52         } else {
  53                 pr_err("Failed to find the right device id.\n");
  54                 return -ENOMEM;
  55         }
  56
  57         dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
  58         if (!dt)
  59                 return -ENOMEM;
  60         denali = &dt->denali;
  61
  62         denali->platform = DT;
  63         denali->dev = &ofdev->dev;
  64         denali->irq = platform_get_irq(ofdev, 0);
  65         if (denali->irq < 0) {
  66                 dev_err(&ofdev->dev, "no irq defined\n");
  67                 return denali->irq;
  68         }
  69
  70         denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
  71         denali->flash_reg = devm_ioremap_resource(&ofdev->dev, denali_reg);
  72         if (IS_ERR(denali->flash_reg))
  73                 return PTR_ERR(denali->flash_reg);
  74
  75         nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
  76         denali->flash_mem = devm_ioremap_resource(&ofdev->dev, nand_data);
  77         if (IS_ERR(denali->flash_mem))
  78                 return PTR_ERR(denali->flash_mem);
  79
  80         if (!of_property_read_u32(ofdev->dev.of_node,
  81                 "dma-mask", (u32 *)&denali_dma_mask)) {
  82                 denali->dev->dma_mask = &denali_dma_mask;
  83         } else {
  84                 denali->dev->dma_mask = NULL;
  85         }
  86
  87         dt->clk = devm_clk_get(&ofdev->dev, NULL);
  88         if (IS_ERR(dt->clk)) {
  89                 dev_err(&ofdev->dev, "no clk available\n");
  90                 return PTR_ERR(dt->clk);
  91         }
  92         clk_prepare_enable(dt->clk);
  93
  94         ret = denali_init(denali);
  95         if (ret)
  96                 goto out_disable_clk;
  97
  98         platform_set_drvdata(ofdev, dt);
  99         return 0;
 100
 101 out_disable_clk:
 102         clk_disable_unprepare(dt->clk);
 103
 104         return ret;
 105 }
 106
 107 static int denali_dt_remove(struct platform_device *ofdev)
 108 {
 109         struct denali_dt *dt = platform_get_drvdata(ofdev);
 110
 111         denali_remove(&dt->denali);
 112         clk_disable_unprepare(dt->clk);
 113
 114         return 0;
 115 }
 116
 117 static struct platform_driver denali_dt_driver = {
 118         .probe          = denali_dt_probe,
 119         .remove         = denali_dt_remove,
 120         .driver         = {
 121                 .name   = "denali-nand-dt",
 122                 .of_match_table = denali_nand_dt_ids,
 123         },
 124 };
 125
 126 module_platform_driver(denali_dt_driver);
 127
 128 MODULE_LICENSE("GPL");
 129 MODULE_AUTHOR("Jamie Iles");
 130 MODULE_DESCRIPTION("DT driver for Denali NAND controller");