arch/powerpc/platforms/ps3/time.c

   1 /*
   2  *  PS3 time and rtc routines.
   3  *
   4  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
   5  *  Copyright 2006 Sony Corp.
   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; version 2 of the License.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/kernel.h>
  22
  23 #include <asm/rtc.h>
  24 #include <asm/lv1call.h>
  25 #include <asm/ps3.h>
  26
  27 #include "platform.h"
  28
  29 #define dump_tm(_a) _dump_tm(_a, __func__, __LINE__)
  30 static void _dump_tm(const struct rtc_time *tm, const char* func, int line)
  31 {
  32         pr_debug("%s:%d tm_sec  %d\n", func, line, tm->tm_sec);
  33         pr_debug("%s:%d tm_min  %d\n", func, line, tm->tm_min);
  34         pr_debug("%s:%d tm_hour %d\n", func, line, tm->tm_hour);
  35         pr_debug("%s:%d tm_mday %d\n", func, line, tm->tm_mday);
  36         pr_debug("%s:%d tm_mon  %d\n", func, line, tm->tm_mon);
  37         pr_debug("%s:%d tm_year %d\n", func, line, tm->tm_year);
  38         pr_debug("%s:%d tm_wday %d\n", func, line, tm->tm_wday);
  39 }
  40
  41 #define dump_time(_a) _dump_time(_a, __func__, __LINE__)
  42 static void __attribute__ ((unused)) _dump_time(int time, const char* func,
  43         int line)
  44 {
  45         struct rtc_time tm;
  46
  47         to_tm(time, &tm);
  48
  49         pr_debug("%s:%d time    %d\n", func, line, time);
  50         _dump_tm(&tm, func, line);
  51 }
  52
  53 /**
  54  * rtc_shift - Difference in seconds between 1970 and the ps3 rtc value.
  55  */
  56
  57 static s64 rtc_shift;
  58
  59 void __init ps3_calibrate_decr(void)
  60 {
  61         int result;
  62         u64 tmp;
  63
  64         result = ps3_repository_read_be_tb_freq(0, &tmp);
  65         BUG_ON(result);
  66
  67         ppc_tb_freq = tmp;
  68         ppc_proc_freq = ppc_tb_freq * 40;
  69
  70         rtc_shift = ps3_os_area_rtc_diff();
  71 }
  72
  73 static u64 read_rtc(void)
  74 {
  75         int result;
  76         u64 rtc_val;
  77         u64 tb_val;
  78
  79         result = lv1_get_rtc(&rtc_val, &tb_val);
  80         BUG_ON(result);
  81
  82         return rtc_val;
  83 }
  84
  85 int ps3_set_rtc_time(struct rtc_time *tm)
  86 {
  87         u64 now = mktime(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
  88                 tm->tm_hour, tm->tm_min, tm->tm_sec);
  89
  90         rtc_shift = now - read_rtc();
  91         return 0;
  92 }
  93
  94 void ps3_get_rtc_time(struct rtc_time *tm)
  95 {
  96         to_tm(read_rtc() + rtc_shift, tm);
  97         tm->tm_year -= 1900;
  98         tm->tm_mon -= 1;
  99 }
 100
 101 unsigned long __init ps3_get_boot_time(void)
 102 {
 103         return read_rtc() + rtc_shift;
 104 }