drivers/mfd/anatop-mfd.c

   1 /*
   2  * Anatop MFD driver
   3  *
   4  * Copyright (C) 2012 Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
   5  * Copyright (C) 2012 Linaro
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License along
  31  *  with this program; if not, write to the Free Software Foundation, Inc.,
  32  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  33  *
  34  */
  35
  36 #include <linux/io.h>
  37 #include <linux/module.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/of.h>
  40 #include <linux/of_platform.h>
  41 #include <linux/of_address.h>
  42 #include <linux/mfd/anatop.h>
  43
  44 u32 anatop_read_reg(struct anatop *adata, u32 addr)
  45 {
  46         return readl(adata->ioreg + addr);
  47 }
  48 EXPORT_SYMBOL_GPL(anatop_read_reg);
  49
  50 void anatop_write_reg(struct anatop *adata, u32 addr, u32 data, u32 mask)
  51 {
  52         u32 val;
  53
  54         data &= mask;
  55
  56         spin_lock(&adata->reglock);
  57         val = readl(adata->ioreg + addr);
  58         val &= ~mask;
  59         val |= data;
  60         writel(val, adata->ioreg + addr);
  61         spin_unlock(&adata->reglock);
  62 }
  63 EXPORT_SYMBOL_GPL(anatop_write_reg);
  64
  65 static const struct of_device_id of_anatop_match[] = {
  66         { .compatible = "fsl,imx6q-anatop", },
  67         { },
  68 };
  69
  70 static int __devinit of_anatop_probe(struct platform_device *pdev)
  71 {
  72         struct device *dev = &pdev->dev;
  73         struct device_node *np = dev->of_node;
  74         void *ioreg;
  75         struct anatop *drvdata;
  76
  77         ioreg = of_iomap(np, 0);
  78         if (!ioreg)
  79                 return -EADDRNOTAVAIL;
  80         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
  81         if (!drvdata)
  82                 return -ENOMEM;
  83         drvdata->ioreg = ioreg;
  84         spin_lock_init(&drvdata->reglock);
  85         platform_set_drvdata(pdev, drvdata);
  86         of_platform_populate(np, of_anatop_match, NULL, dev);
  87
  88         return 0;
  89 }
  90
  91 static int __devexit of_anatop_remove(struct platform_device *pdev)
  92 {
  93         struct anatop *drvdata;
  94         drvdata = platform_get_drvdata(pdev);
  95         iounmap(drvdata->ioreg);
  96
  97         return 0;
  98 }
  99
 100 static struct platform_driver anatop_of_driver = {
 101         .driver = {
 102                 .name = "anatop-mfd",
 103                 .owner = THIS_MODULE,
 104                 .of_match_table = of_anatop_match,
 105         },
 106         .probe          = of_anatop_probe,
 107         .remove         = of_anatop_remove,
 108 };
 109
 110 static int __init anatop_init(void)
 111 {
 112         return platform_driver_register(&anatop_of_driver);
 113 }
 114 postcore_initcall(anatop_init);
 115
 116 static void __exit anatop_exit(void)
 117 {
 118         platform_driver_unregister(&anatop_of_driver);
 119 }
 120 module_exit(anatop_exit);
 121
 122 MODULE_AUTHOR("Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
 123 MODULE_DESCRIPTION("ANATOP MFD driver");
 124 MODULE_LICENSE("GPL v2");