Commit 2136092b authored by Gu Zitao's avatar Gu Zitao Committed by Zheng Zengkai
Browse files

sw64: add hypervisor based RTC on SW64 systems 

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SPZD


CVE: NA

-------------------------------

With this support, it can enable kvm guest rtc sync.

Signed-off-by: Gu Zitao <guzitao@wxiat.com> #openEuler_contributor
Signed-off-by: default avatarLaibin Qiu <qiulaibin@huawei.com>
Reviewed-by: default avatarHanjun Guo <guohanjun@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 75f7cd80

drivers/rtc/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -973,6 +973,13 @@ config RTC_DRV_ALPHA 
	  Direct support for the real-time clock found on every Alpha

	  system, specifically MC146818 compatibles.  If in doubt, say Y.



config RTC_DRV_SW64_VIRT

	bool "SW64 Hypervisor based RTC"

	depends on SW64

	default y

	help

          Get support for the Hypervisor based RTC on SW64 systems.



config RTC_DRV_VRTC

	tristate "Virtual RTC for Intel MID platforms"

	depends on X86_INTEL_MID

drivers/rtc/Makefile

+5 −0
Original line number Diff line number Diff line
@@ -11,6 +11,10 @@ obj-$(CONFIG_RTC_CLASS) += rtc-core.o 
obj-$(CONFIG_RTC_MC146818_LIB)	+= rtc-mc146818-lib.o

rtc-core-y			:= class.o interface.o



ifdef CONFIG_RTC_DRV_SW64_VIRT

rtc-core-y			+= rtc-sw64-virt-platform.o

endif



rtc-core-$(CONFIG_RTC_NVMEM)		+= nvmem.o

rtc-core-$(CONFIG_RTC_INTF_DEV)		+= dev.o

rtc-core-$(CONFIG_RTC_INTF_PROC)	+= proc.o
@@ -164,6 +168,7 @@ obj-$(CONFIG_RTC_DRV_ST_LPC) += rtc-st-lpc.o 
obj-$(CONFIG_RTC_DRV_STM32) 	+= rtc-stm32.o

obj-$(CONFIG_RTC_DRV_STMP)	+= rtc-stmp3xxx.o

obj-$(CONFIG_RTC_DRV_SUN4V)	+= rtc-sun4v.o

obj-$(CONFIG_RTC_DRV_SW64_VIRT) += rtc-sw64-virt.o

obj-$(CONFIG_RTC_DRV_SUN6I)	+= rtc-sun6i.o

obj-$(CONFIG_RTC_DRV_SUNXI)	+= rtc-sunxi.o

obj-$(CONFIG_RTC_DRV_TEGRA)	+= rtc-tegra.o

drivers/rtc/rtc-sw64-virt-platform.c

0 → 100644
+26 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0



#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt



#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/efi.h>

#include <linux/platform_device.h>



static struct platform_device rtc_sw64_virt_device = {

	.name		= "rtc_sw64_virt",

	.id		= -1,

};



static int __init rtc_sw64_virt_init(void)

{

	if (is_in_host())

		return 0;



	if (platform_device_register(&rtc_sw64_virt_device) < 0)

		pr_err("unable to register rtc device...\n");

		/* not necessarily an error */

	return 0;

}

module_init(rtc_sw64_virt_init);

drivers/rtc/rtc-sw64-virt.c

0 → 100644
+55 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* rtc-sw64-virt.c: Hypervisor based RTC for SW64 systems.

 *

 * Copyright (C) 2021 Lu Feifei <luff@gmail.com>

 */



#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/rtc.h>

#include <linux/platform_device.h>



#define RTC_IO_ADDR (0x804910000000ULL)



static int sw64_virt_read_time(struct device *dev, struct rtc_time *tm)

{

	unsigned long *ioaddr;



	ioaddr = ioremap(RTC_IO_ADDR, sizeof(long));

	rtc_time64_to_tm(*ioaddr, tm);

	return 0;

}



static const struct rtc_class_ops rtc_sw64_virt_ops = {

	.read_time	= sw64_virt_read_time,

};



static int __init rtc_sw64_virt_probe(struct platform_device *pdev)

{

	struct rtc_device *rtc;



	rtc = devm_rtc_device_register(&pdev->dev, "sw64_virt",

				&rtc_sw64_virt_ops, THIS_MODULE);

	if (IS_ERR(rtc))

		return PTR_ERR(rtc);



	platform_set_drvdata(pdev, rtc);

	return 0;

}



static struct platform_driver rtc_sw64_virt_driver = {

	.driver		= {

		.name	= "rtc_sw64_virt",

	},

};



module_platform_driver_probe(rtc_sw64_virt_driver, rtc_sw64_virt_probe);



MODULE_AUTHOR("Lu Feifei <luff@gmail.com>");

MODULE_DESCRIPTION("Sunway virtual RTC driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:rtc_sw64_virt");