arch/powerpc/platforms/ps3/time.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  PS3 time and rtc routines.
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 */

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>

#include <asm/firmware.h>
#include <asm/lv1call.h>
#include <asm/ps3.h>

#include "platform.h"

void __init ps3_calibrate_decr(void)
{
	int result;
	u64 tmp;

	result = ps3_repository_read_be_tb_freq(0, &tmp);
	BUG_ON(result);

	ppc_tb_freq = tmp;
	ppc_proc_freq = ppc_tb_freq * 40;
}

static u64 read_rtc(void)
{
	int result;
	u64 rtc_val;
	u64 tb_val;

	result = lv1_get_rtc(&rtc_val, &tb_val);
	BUG_ON(result);

	return rtc_val;
}

time64_t __init ps3_get_boot_time(void)
{
	return read_rtc() + ps3_os_area_get_rtc_diff();
}

static int __init ps3_rtc_init(void)
{
	struct platform_device *pdev;

	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
		return -ENODEV;

	pdev = platform_device_register_simple("rtc-ps3", -1, NULL, 0);

	return PTR_ERR_OR_ZERO(pdev);
}
device_initcall(ps3_rtc_init);