linux/drivers/mfd/anatop-mfd.c
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   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
  44u32 anatop_read_reg(struct anatop *adata, u32 addr)
  45{
  46        return readl(adata->ioreg + addr);
  47}
  48EXPORT_SYMBOL_GPL(anatop_read_reg);
  49
  50void 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}
  63EXPORT_SYMBOL_GPL(anatop_write_reg);
  64
  65static const struct of_device_id of_anatop_match[] = {
  66        { .compatible = "fsl,imx6q-anatop", },
  67        { },
  68};
  69
  70static 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, NULL, NULL, dev);
  87
  88        return 0;
  89}
  90
  91static 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
 100static 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
 110static int __init anatop_init(void)
 111{
 112        return platform_driver_register(&anatop_of_driver);
 113}
 114postcore_initcall(anatop_init);
 115
 116static void __exit anatop_exit(void)
 117{
 118        platform_driver_unregister(&anatop_of_driver);
 119}
 120module_exit(anatop_exit);
 121
 122MODULE_AUTHOR("Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
 123MODULE_DESCRIPTION("ANATOP MFD driver");
 124MODULE_LICENSE("GPL v2");
 125
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