diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/rtc/rtc-sun4v.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/rtc/rtc-sun4v.c')
-rw-r--r-- | kernel/drivers/rtc/rtc-sun4v.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/kernel/drivers/rtc/rtc-sun4v.c b/kernel/drivers/rtc/rtc-sun4v.c new file mode 100644 index 000000000..7c696c12f --- /dev/null +++ b/kernel/drivers/rtc/rtc-sun4v.c @@ -0,0 +1,105 @@ +/* rtc-sun4v.c: Hypervisor based RTC for SUN4V systems. + * + * Copyright (C) 2008 David S. Miller <davem@davemloft.net> + */ + +#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> + +#include <asm/hypervisor.h> + +static unsigned long hypervisor_get_time(void) +{ + unsigned long ret, time; + int retries = 10000; + +retry: + ret = sun4v_tod_get(&time); + if (ret == HV_EOK) + return time; + if (ret == HV_EWOULDBLOCK) { + if (--retries > 0) { + udelay(100); + goto retry; + } + pr_warn("tod_get() timed out.\n"); + return 0; + } + pr_warn("tod_get() not supported.\n"); + return 0; +} + +static int sun4v_read_time(struct device *dev, struct rtc_time *tm) +{ + rtc_time_to_tm(hypervisor_get_time(), tm); + return 0; +} + +static int hypervisor_set_time(unsigned long secs) +{ + unsigned long ret; + int retries = 10000; + +retry: + ret = sun4v_tod_set(secs); + if (ret == HV_EOK) + return 0; + if (ret == HV_EWOULDBLOCK) { + if (--retries > 0) { + udelay(100); + goto retry; + } + pr_warn("tod_set() timed out.\n"); + return -EAGAIN; + } + pr_warn("tod_set() not supported.\n"); + return -EOPNOTSUPP; +} + +static int sun4v_set_time(struct device *dev, struct rtc_time *tm) +{ + unsigned long secs; + int err; + + err = rtc_tm_to_time(tm, &secs); + if (err) + return err; + + return hypervisor_set_time(secs); +} + +static const struct rtc_class_ops sun4v_rtc_ops = { + .read_time = sun4v_read_time, + .set_time = sun4v_set_time, +}; + +static int __init sun4v_rtc_probe(struct platform_device *pdev) +{ + struct rtc_device *rtc; + + rtc = devm_rtc_device_register(&pdev->dev, "sun4v", + &sun4v_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc)) + return PTR_ERR(rtc); + + platform_set_drvdata(pdev, rtc); + return 0; +} + +static struct platform_driver sun4v_rtc_driver = { + .driver = { + .name = "rtc-sun4v", + }, +}; + +module_platform_driver_probe(sun4v_rtc_driver, sun4v_rtc_probe); + +MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); +MODULE_DESCRIPTION("SUN4V RTC driver"); +MODULE_LICENSE("GPL"); |