parisc: add rtc platform driver

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
This commit is contained in:
Kyle McMartin 2008-09-10 14:24:07 +00:00 committed by Kyle McMartin
parent f0514ae323
commit 9eb1686423
5 changed files with 141 additions and 1 deletions

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@ -9,6 +9,8 @@ config PARISC
def_bool y
select HAVE_IDE
select HAVE_OPROFILE
select RTC_CLASS
select RTC_DRV_PARISC
help
The PA-RISC microprocessor is designed by Hewlett-Packard and used
in many of their workstations & servers (HP9000 700 and 800 series,

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@ -23,6 +23,7 @@
#include <linux/smp.h>
#include <linux/profile.h>
#include <linux/clocksource.h>
#include <linux/platform_device.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@ -215,6 +216,24 @@ void __init start_cpu_itimer(void)
cpu_data[cpu].it_value = next_tick;
}
struct platform_device rtc_parisc_dev = {
.name = "rtc-parisc",
.id = -1,
};
static int __init rtc_init(void)
{
int ret;
ret = platform_device_register(&rtc_parisc_dev);
if (ret < 0)
printk(KERN_ERR "unable to register rtc device...\n");
/* not necessarily an error */
return 0;
}
module_init(rtc_init);
void __init time_init(void)
{
static struct pdc_tod tod_data;
@ -245,4 +264,3 @@ void __init time_init(void)
xtime.tv_nsec = 0;
}
}

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@ -575,6 +575,14 @@ config RTC_DRV_RS5C313
help
If you say yes here you get support for the Ricoh RS5C313 RTC chips.
config RTC_DRV_PARISC
tristate "PA-RISC firmware RTC support"
depends on PARISC
help
Say Y or M here to enable RTC support on PA-RISC systems using
firmware calls. If you do not know what you are doing, you should
just say Y.
config RTC_DRV_PPC
tristate "PowerPC machine dependent RTC support"
depends on PPC_MERGE

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@ -45,6 +45,7 @@ obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030.o
obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
obj-$(CONFIG_RTC_DRV_PARISC) += rtc-parisc.o
obj-$(CONFIG_RTC_DRV_PPC) += rtc-ppc.o
obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o

111
drivers/rtc/rtc-parisc.c Normal file
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@ -0,0 +1,111 @@
/* rtc-parisc: RTC for HP PA-RISC firmware
*
* Copyright (C) 2008 Kyle McMartin <kyle@mcmartin.ca>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/time.h>
#include <linux/platform_device.h>
#include <asm/rtc.h>
/* as simple as can be, and no simpler. */
struct parisc_rtc {
struct rtc_device *rtc;
spinlock_t lock;
};
static int parisc_get_time(struct device *dev, struct rtc_time *tm)
{
struct parisc_rtc *p = dev_get_drvdata(dev);
unsigned long flags, ret;
spin_lock_irqsave(&p->lock, flags);
ret = get_rtc_time(tm);
spin_unlock_irqrestore(&p->lock, flags);
if (ret & RTC_BATT_BAD)
return -EOPNOTSUPP;
return 0;
}
static int parisc_set_time(struct device *dev, struct rtc_time *tm)
{
struct parisc_rtc *p = dev_get_drvdata(dev);
unsigned long flags, ret;
spin_lock_irqsave(&p->lock, flags);
ret = set_rtc_time(tm);
spin_unlock_irqrestore(&p->lock, flags);
if (ret < 0)
return -EOPNOTSUPP;
return 0;
}
static const struct rtc_class_ops parisc_rtc_ops = {
.read_time = parisc_get_time,
.set_time = parisc_set_time,
};
static int __devinit parisc_rtc_probe(struct platform_device *dev)
{
struct parisc_rtc *p;
p = kzalloc(sizeof (*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
spin_lock_init(&p->lock);
p->rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops,
THIS_MODULE);
if (IS_ERR(p->rtc)) {
int err = PTR_ERR(p->rtc);
kfree(p);
return err;
}
platform_set_drvdata(dev, p);
return 0;
}
static int __devexit parisc_rtc_remove(struct platform_device *dev)
{
struct parisc_rtc *p = platform_get_drvdata(dev);
rtc_device_unregister(p->rtc);
kfree(p);
return 0;
}
static struct platform_driver parisc_rtc_driver = {
.driver = {
.name = "rtc-parisc",
.owner = THIS_MODULE,
},
.probe = parisc_rtc_probe,
.remove = __devexit_p(parisc_rtc_remove),
};
static int __init parisc_rtc_init(void)
{
return platform_driver_register(&parisc_rtc_driver);
}
static void __exit parisc_rtc_fini(void)
{
platform_driver_unregister(&parisc_rtc_driver);
}
module_init(parisc_rtc_init);
module_exit(parisc_rtc_fini);
MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("HP PA-RISC RTC driver");