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anolis: sw64: add hypervisor based RTC on SW64 systems 

ANBZ: #4688

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

Signed-off-by: Gu Zitao <guzitao@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>
Reviewed-by: Gu Mi <gumi@linux.alibaba.com>
Reviewed-by: Guixin Liu <kanie@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/1659
This commit is contained in:
Gu Zitao 2022-01-29 10:51:13 +08:00 committed by 小龙
parent bafb6f24eb
commit 0aab247e02
4 changed files with 93 additions and 0 deletions
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7
drivers/rtc/Kconfig
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@ -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

5
drivers/rtc/Makefile
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@ -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-$(CONFIG_RTC_INTF_PROC) += proc.o
@ -165,6 +169,7 @@ obj-$(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

26
drivers/rtc/rtc-sw64-virt-platform.c Normal file
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@ -0,0 +1,26 @@
// 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);

55
drivers/rtc/rtc-sw64-virt.c Normal file
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@ -0,0 +1,55 @@
// 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");