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Linux/arch/powerpc/platforms/ps3/time.c

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  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 #include <linux/platform_device.h>
 23 #include <linux/rtc.h>
 24 
 25 #include <asm/firmware.h>
 26 #include <asm/lv1call.h>
 27 #include <asm/ps3.h>
 28 
 29 #include "platform.h"
 30 
 31 void __init ps3_calibrate_decr(void)
 32 {
 33         int result;
 34         u64 tmp;
 35 
 36         result = ps3_repository_read_be_tb_freq(0, &tmp);
 37         BUG_ON(result);
 38 
 39         ppc_tb_freq = tmp;
 40         ppc_proc_freq = ppc_tb_freq * 40;
 41 }
 42 
 43 static u64 read_rtc(void)
 44 {
 45         int result;
 46         u64 rtc_val;
 47         u64 tb_val;
 48 
 49         result = lv1_get_rtc(&rtc_val, &tb_val);
 50         BUG_ON(result);
 51 
 52         return rtc_val;
 53 }
 54 
 55 time64_t __init ps3_get_boot_time(void)
 56 {
 57         return read_rtc() + ps3_os_area_get_rtc_diff();
 58 }
 59 
 60 static int __init ps3_rtc_init(void)
 61 {
 62         struct platform_device *pdev;
 63 
 64         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 65                 return -ENODEV;
 66 
 67         pdev = platform_device_register_simple("rtc-ps3", -1, NULL, 0);
 68 
 69         return PTR_ERR_OR_ZERO(pdev);
 70 }
 71 device_initcall(ps3_rtc_init);
 72 

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