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7a138ede
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体验新版 GitCode,发现更多精彩内容 >>
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7a138ede
编写于
8月 29, 2008
作者:
D
David S. Miller
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
rtc: Add Sun4V hypervisor RTC driver.
Signed-off-by:
N
David S. Miller
<
davem@davemloft.net
>
上级
29b503f1
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
161 addition
and
0 deletion
+161
-0
drivers/rtc/Kconfig
drivers/rtc/Kconfig
+7
-0
drivers/rtc/Makefile
drivers/rtc/Makefile
+1
-0
drivers/rtc/rtc-sun4v.c
drivers/rtc/rtc-sun4v.c
+153
-0
未找到文件。
drivers/rtc/Kconfig
浏览文件 @
7a138ede
...
...
@@ -592,4 +592,11 @@ config RTC_DRV_PPC
the RTC. This exposes that functionality through the generic RTC
class.
config RTC_DRV_SUN4V
bool "SUN4V Hypervisor RTC"
depends on SPARC64
help
If you say Y here you will get support for the Hypervisor
based RTC on SUN4V systems.
endif # RTC_CLASS
drivers/rtc/Makefile
浏览文件 @
7a138ede
...
...
@@ -39,6 +39,7 @@ obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o
obj-$(CONFIG_RTC_DRV_M48T59)
+=
rtc-m48t59.o
obj-$(CONFIG_RTC_DRV_M48T86)
+=
rtc-m48t86.o
obj-$(CONFIG_RTC_DRV_BQ4802)
+=
rtc-bq4802.o
obj-$(CONFIG_RTC_DRV_SUN4V)
+=
rtc-sun4v.o
obj-$(CONFIG_RTC_DRV_MAX6900)
+=
rtc-max6900.o
obj-$(CONFIG_RTC_DRV_MAX6902)
+=
rtc-max6902.o
obj-$(CONFIG_RTC_DRV_OMAP)
+=
rtc-omap.o
...
...
drivers/rtc/rtc-sun4v.c
0 → 100644
浏览文件 @
7a138ede
/* rtc-sun4c.c: Hypervisor based RTC for SUN4V systems.
*
* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <asm/hypervisor.h>
MODULE_AUTHOR
(
"David S. Miller <davem@davemloft.net>"
);
MODULE_DESCRIPTION
(
"SUN4V RTC driver"
);
MODULE_LICENSE
(
"GPL"
);
struct
sun4v_rtc
{
struct
rtc_device
*
rtc
;
spinlock_t
lock
;
};
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
;
}
printk
(
KERN_WARNING
"SUN4V: tod_get() timed out.
\n
"
);
return
0
;
}
printk
(
KERN_WARNING
"SUN4V: tod_get() not supported.
\n
"
);
return
0
;
}
static
int
sun4v_read_time
(
struct
device
*
dev
,
struct
rtc_time
*
tm
)
{
struct
sun4v_rtc
*
p
=
dev_get_drvdata
(
dev
);
unsigned
long
flags
,
secs
;
spin_lock_irqsave
(
&
p
->
lock
,
flags
);
secs
=
hypervisor_get_time
();
spin_unlock_irqrestore
(
&
p
->
lock
,
flags
);
rtc_time_to_tm
(
secs
,
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
;
}
printk
(
KERN_WARNING
"SUN4V: tod_set() timed out.
\n
"
);
return
-
EAGAIN
;
}
printk
(
KERN_WARNING
"SUN4V: tod_set() not supported.
\n
"
);
return
-
EOPNOTSUPP
;
}
static
int
sun4v_set_time
(
struct
device
*
dev
,
struct
rtc_time
*
tm
)
{
struct
sun4v_rtc
*
p
=
dev_get_drvdata
(
dev
);
unsigned
long
flags
,
secs
;
int
err
;
err
=
rtc_tm_to_time
(
tm
,
&
secs
);
if
(
err
)
return
err
;
spin_lock_irqsave
(
&
p
->
lock
,
flags
);
err
=
hypervisor_set_time
(
secs
);
spin_unlock_irqrestore
(
&
p
->
lock
,
flags
);
return
err
;
}
static
const
struct
rtc_class_ops
sun4v_rtc_ops
=
{
.
read_time
=
sun4v_read_time
,
.
set_time
=
sun4v_set_time
,
};
static
int
__devinit
sun4v_rtc_probe
(
struct
platform_device
*
pdev
)
{
struct
sun4v_rtc
*
p
=
kzalloc
(
sizeof
(
*
p
),
GFP_KERNEL
);
if
(
!
p
)
return
-
ENOMEM
;
spin_lock_init
(
&
p
->
lock
);
p
->
rtc
=
rtc_device_register
(
"sun4v"
,
&
pdev
->
dev
,
&
sun4v_rtc_ops
,
THIS_MODULE
);
if
(
IS_ERR
(
p
->
rtc
))
{
int
err
=
PTR_ERR
(
p
->
rtc
);
kfree
(
p
);
return
err
;
}
platform_set_drvdata
(
pdev
,
p
);
return
0
;
}
static
int
__devexit
sun4v_rtc_remove
(
struct
platform_device
*
pdev
)
{
struct
sun4v_rtc
*
p
=
platform_get_drvdata
(
pdev
);
rtc_device_unregister
(
p
->
rtc
);
kfree
(
p
);
return
0
;
}
static
struct
platform_driver
sun4v_rtc_driver
=
{
.
driver
=
{
.
name
=
"rtc-sun4v"
,
.
owner
=
THIS_MODULE
,
},
.
probe
=
sun4v_rtc_probe
,
.
remove
=
__devexit_p
(
sun4v_rtc_remove
),
};
static
int
__init
sun4v_rtc_init
(
void
)
{
return
platform_driver_register
(
&
sun4v_rtc_driver
);
}
static
void
__exit
sun4v_rtc_exit
(
void
)
{
platform_driver_unregister
(
&
sun4v_rtc_driver
);
}
module_init
(
sun4v_rtc_init
);
module_exit
(
sun4v_rtc_exit
);
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