linux/drivers/rtc/rtc-ps3.c
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   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 = devm_rtc_device_register(&dev->dev, "rtc-ps3", &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 struct platform_driver ps3_rtc_driver = {
  75        .driver = {
  76                .name = "rtc-ps3",
  77                .owner = THIS_MODULE,
  78        },
  79};
  80
  81module_platform_driver_probe(ps3_rtc_driver, ps3_rtc_probe);
  82
  83MODULE_AUTHOR("Sony Corporation");
  84MODULE_LICENSE("GPL");
  85MODULE_DESCRIPTION("ps3 RTC driver");
  86MODULE_ALIAS("platform:rtc-ps3");
  87
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