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 #include <linux/slab.h>
  25
  26 #include "denali.h"
  27
  28 struct denali_dt {
  29         struct denali_nand_info denali;
  30         struct clk              *clk;
  31 };
  32
  33 static const struct of_device_id denali_nand_dt_ids[] = {
  34                 { .compatible = "denali,denali-nand-dt" },
  35                 { /* sentinel */ }
  36         };
  37
  38 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
  39
  40 static u64 denali_dma_mask;
  41
  42 static int denali_dt_probe(struct platform_device *ofdev)
  43 {
  44         struct resource *denali_reg, *nand_data;
  45         struct denali_dt *dt;
  46         struct denali_nand_info *denali;
  47         int ret;
  48         const struct of_device_id *of_id;
  49
  50         of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
  51         if (of_id) {
  52                 ofdev->id_entry = of_id->data;
  53         } else {
  54                 pr_err("Failed to find the right device id.\n");
  55                 return -ENOMEM;
  56         }
  57
  58         dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
  59         if (!dt)
  60                 return -ENOMEM;
  61         denali = &dt->denali;
  62
  63         denali->platform = DT;
  64         denali->dev = &ofdev->dev;
  65         denali->irq = platform_get_irq(ofdev, 0);
  66         if (denali->irq < 0) {
  67                 dev_err(&ofdev->dev, "no irq defined\n");
  68                 return denali->irq;
  69         }
  70
  71         denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
  72         denali->flash_reg = devm_ioremap_resource(&ofdev->dev, denali_reg);
  73         if (IS_ERR(denali->flash_reg))
  74                 return PTR_ERR(denali->flash_reg);
  75
  76         nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
  77         denali->flash_mem = devm_ioremap_resource(&ofdev->dev, nand_data);
  78         if (IS_ERR(denali->flash_mem))
  79                 return PTR_ERR(denali->flash_mem);
  80
  81         if (!of_property_read_u32(ofdev->dev.of_node,
  82                 "dma-mask", (u32 *)&denali_dma_mask)) {
  83                 denali->dev->dma_mask = &denali_dma_mask;
  84         } else {
  85                 denali->dev->dma_mask = NULL;
  86         }
  87
  88         dt->clk = devm_clk_get(&ofdev->dev, NULL);
  89         if (IS_ERR(dt->clk)) {
  90                 dev_err(&ofdev->dev, "no clk available\n");
  91                 return PTR_ERR(dt->clk);
  92         }
  93         clk_prepare_enable(dt->clk);
  94
  95         ret = denali_init(denali);
  96         if (ret)
  97                 goto out_disable_clk;
  98
  99         platform_set_drvdata(ofdev, dt);
 100         return 0;
 101
 102 out_disable_clk:
 103         clk_disable_unprepare(dt->clk);
 104
 105         return ret;
 106 }
 107
 108 static int denali_dt_remove(struct platform_device *ofdev)
 109 {
 110         struct denali_dt *dt = platform_get_drvdata(ofdev);
 111
 112         denali_remove(&dt->denali);
 113         clk_disable(dt->clk);
 114
 115         return 0;
 116 }
 117
 118 static struct platform_driver denali_dt_driver = {
 119         .probe          = denali_dt_probe,
 120         .remove         = denali_dt_remove,
 121         .driver         = {
 122                 .name   = "denali-nand-dt",
 123                 .owner  = THIS_MODULE,
 124                 .of_match_table = denali_nand_dt_ids,
 125         },
 126 };
 127
 128 module_platform_driver(denali_dt_driver);
 129
 130 MODULE_LICENSE("GPL");
 131 MODULE_AUTHOR("Jamie Iles");
 132 MODULE_DESCRIPTION("DT driver for Denali NAND controller");