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
  29 static 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
  41 static 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
  47 static 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
  56 static const struct rtc_class_ops ps3_rtc_ops = {
  57         .read_time = ps3_get_time,
  58         .set_time = ps3_set_time,
  59 };
  60
  61 static 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
  74 static struct platform_driver ps3_rtc_driver = {
  75         .driver = {
  76                 .name = "rtc-ps3",
  77         },
  78 };
  79
  80 module_platform_driver_probe(ps3_rtc_driver, ps3_rtc_probe);
  81
  82 MODULE_AUTHOR("Sony Corporation");
  83 MODULE_LICENSE("GPL");
  84 MODULE_DESCRIPTION("ps3 RTC driver");
  85 MODULE_ALIAS("platform:rtc-ps3");