LXR linux/drivers/rtc/rtc-ps3.c

   1/*
   2 * PS3 RTC Driver
   3 *
   4 * Copyright 2009 Sony Corporation
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; version 2 of the License.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program.
  17 * If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20#include <linux/kernel.h>
  21#include <linux/module.h>
  22#include <linux/platform_device.h>
  23#include <linux/rtc.h>
  24
  25#include <asm/lv1call.h>
  26#include <asm/ps3.h>
  27
  28
  29static u64 read_rtc(void)
  30{
  31        int result;
  32        u64 rtc_val;
  33        u64 tb_val;
  34
  35        result = lv1_get_rtc(&rtc_val, &tb_val);
  36        BUG_ON(result);
  37
  38        return rtc_val;
  39}
  40
  41static int ps3_get_time(struct device *dev, struct rtc_time *tm)
  42{
  43        rtc_time_to_tm(read_rtc() + ps3_os_area_get_rtc_diff(), tm);
  44        return rtc_valid_tm(tm);
  45}
  46
  47static int ps3_set_time(struct device *dev, struct rtc_time *tm)
  48{
  49        unsigned long now;
  50
  51        rtc_tm_to_time(tm, &now);
  52        ps3_os_area_set_rtc_diff(now - read_rtc());
  53        return 0;
  54}
  55
  56static const struct rtc_class_ops ps3_rtc_ops = {
  57        .read_time = ps3_get_time,
  58        .set_time = ps3_set_time,
  59};
  60
  61static int __init ps3_rtc_probe(struct platform_device *dev)
  62{
  63        struct rtc_device *rtc;
  64
  65        rtc = rtc_device_register("rtc-ps3", &dev->dev, &ps3_rtc_ops,
  66                                  THIS_MODULE);
  67        if (IS_ERR(rtc))
  68                return PTR_ERR(rtc);
  69
  70        platform_set_drvdata(dev, rtc);
  71        return 0;
  72}
  73
  74static int __exit ps3_rtc_remove(struct platform_device *dev)
  75{
  76        rtc_device_unregister(platform_get_drvdata(dev));
  77        return 0;
  78}
  79
  80static struct platform_driver ps3_rtc_driver = {
  81        .driver = {
  82                .name = "rtc-ps3",
  83                .owner = THIS_MODULE,
  84        },
  85        .remove = __exit_p(ps3_rtc_remove),
  86};
  87
  88static int __init ps3_rtc_init(void)
  89{
  90        return platform_driver_probe(&ps3_rtc_driver, ps3_rtc_probe);
  91}
  92
  93static void __exit ps3_rtc_fini(void)
  94{
  95        platform_driver_unregister(&ps3_rtc_driver);
  96}
  97
  98module_init(ps3_rtc_init);
  99module_exit(ps3_rtc_fini);
 100
 101MODULE_AUTHOR("Sony Corporation");
 102MODULE_LICENSE("GPL");
 103MODULE_DESCRIPTION("ps3 RTC driver");
 104MODULE_ALIAS("platform:rtc-ps3");
 105