parisc: add rtc platform driver
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index a7d4fd35..0a8ac70 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -9,6 +9,8 @@
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,
diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index 24be86b..4d09203 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -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 @@
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 @@
xtime.tv_nsec = 0;
}
}
-
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 9a9755c..30d40fe 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -575,6 +575,14 @@
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
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 18622ef..180ddac 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -45,6 +45,7 @@
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
diff --git a/drivers/rtc/rtc-parisc.c b/drivers/rtc/rtc-parisc.c
new file mode 100644
index 0000000..346d633
--- /dev/null
+++ b/drivers/rtc/rtc-parisc.c
@@ -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");