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Message-ID: <20090114173745.GA24492@ldl.fc.hp.com>
Date: Wed, 14 Jan 2009 10:37:45 -0700
From: dann frazier <dannf@...nf.org>
To: Alessandro Zummo <alessandro.zummo@...ertech.it>
Cc: rtc-linux@...glegroups.com,
Andrew Morton <akpm@...ux-foundation.org>,
linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
stephane eranian <eranian@...glemail.com>
Subject: [PATCH] add rtc platform driver for EFI
Munge Stephane Eranian's efirtc.c code into an rtc platform driver
Signed-off-by: dann frazier <dannf@...com>
---
arch/ia64/kernel/time.c | 16 +++
drivers/rtc/Kconfig | 10 ++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-efi.c | 237 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 264 insertions(+), 0 deletions(-)
create mode 100644 drivers/rtc/rtc-efi.c
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index f0ebb34..558051c 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -20,6 +20,7 @@
#include <linux/efi.h>
#include <linux/timex.h>
#include <linux/clocksource.h>
+#include <linux/platform_device.h>
#include <asm/machvec.h>
#include <asm/delay.h>
@@ -405,6 +406,21 @@ static struct irqaction timer_irqaction = {
.name = "timer"
};
+static struct platform_device rtc_efi_dev = {
+ .name = "rtc-efi",
+ .id = -1,
+};
+
+static int __init rtc_init(void)
+{
+ if (platform_device_register(&rtc_efi_dev) < 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)
{
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index cced4d1..56cc98f 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -434,6 +434,16 @@ config RTC_DRV_DS1742
This driver can also be built as a module. If so, the module
will be called rtc-ds1742.
+config RTC_DRV_EFI
+ tristate "EFI RTC"
+ depends on IA64
+ help
+ If you say yes here you will get support for the EFI
+ Real Time Clock.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-efi.
+
config RTC_DRV_STK17TA8
tristate "Simtek STK17TA8"
depends on RTC_CLASS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 6e28021..7256ce8 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o
+obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o
obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
obj-$(CONFIG_RTC_DRV_FM3130) += rtc-fm3130.o
obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o
diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c
new file mode 100644
index 0000000..cf37810
--- /dev/null
+++ b/drivers/rtc/rtc-efi.c
@@ -0,0 +1,237 @@
+/*
+ * rtc-efi: RTC Class Driver for EFI-based systems
+ *
+ * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
+ *
+ * Author: dann frazier <dannf@...com>
+ * Based on efirtc.c by Stephane Eranian
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/efi.h>
+
+#define EFI_ISDST (EFI_TIME_ADJUST_DAYLIGHT|EFI_TIME_IN_DAYLIGHT)
+/*
+ * EFI Epoch is 1/1/1998
+ */
+#define EFI_RTC_EPOCH 1998
+
+#define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400))
+
+/*
+ * returns day of the year [0-365]
+ */
+static inline int
+compute_yday(efi_time_t *eft)
+{
+ /* efi_time_t.month is in the [1-12] so, we need -1 */
+ return rtc_year_days(eft->day - 1, eft->month - 1, eft->year);
+}
+/*
+ * returns day of the week [0-6] 0=Sunday
+ *
+ * Don't try to provide a year that's before 1998, please !
+ */
+static int
+compute_wday(efi_time_t *eft)
+{
+ int y;
+ int ndays = 0;
+
+ if (eft->year < 1998) {
+ printk(KERN_ERR "efirtc: EFI year < 1998, invalid date\n");
+ return -1;
+ }
+
+ for (y = EFI_RTC_EPOCH; y < eft->year; y++)
+ ndays += 365 + (LEAP_YEAR(y) ? 1 : 0);
+
+ ndays += compute_yday(eft);
+
+ /*
+ * 4=1/1/1998 was a Thursday
+ */
+ return (ndays + 4) % 7;
+}
+
+static void
+convert_to_efi_time(struct rtc_time *wtime, efi_time_t *eft)
+{
+ eft->year = wtime->tm_year + 1900;
+ eft->month = wtime->tm_mon + 1;
+ eft->day = wtime->tm_mday;
+ eft->hour = wtime->tm_hour;
+ eft->minute = wtime->tm_min;
+ eft->second = wtime->tm_sec;
+ eft->nanosecond = 0;
+ eft->daylight = wtime->tm_isdst ? EFI_ISDST : 0;
+ eft->timezone = EFI_UNSPECIFIED_TIMEZONE;
+}
+
+static void
+convert_from_efi_time(efi_time_t *eft, struct rtc_time *wtime)
+{
+ memset(wtime, 0, sizeof(*wtime));
+ wtime->tm_sec = eft->second;
+ wtime->tm_min = eft->minute;
+ wtime->tm_hour = eft->hour;
+ wtime->tm_mday = eft->day;
+ wtime->tm_mon = eft->month - 1;
+ wtime->tm_year = eft->year - 1900;
+
+ /* day of the week [0-6], Sunday=0 */
+ wtime->tm_wday = compute_wday(eft);
+
+ /* day in the year [1-365]*/
+ wtime->tm_yday = compute_yday(eft);
+
+
+ switch (eft->daylight & EFI_ISDST) {
+ case EFI_ISDST:
+ wtime->tm_isdst = 1;
+ break;
+ case EFI_TIME_ADJUST_DAYLIGHT:
+ wtime->tm_isdst = 0;
+ break;
+ default:
+ wtime->tm_isdst = -1;
+ }
+}
+
+static int efi_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
+{
+ efi_time_t eft;
+ efi_status_t status;
+
+ /*
+ * As of EFI v1.10, this call always returns an unsupported status
+ */
+ status = efi.get_wakeup_time((efi_bool_t *)&wkalrm->enabled,
+ (efi_bool_t *)&wkalrm->pending, &eft);
+
+ if (status != EFI_SUCCESS)
+ return -EINVAL;
+
+ convert_from_efi_time(&eft, &wkalrm->time);
+
+ return rtc_valid_tm(&wkalrm->time);
+}
+
+static int efi_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
+{
+ efi_time_t eft;
+ efi_status_t status;
+
+ convert_to_efi_time(&wkalrm->time, &eft);
+
+ /*
+ * XXX Fixme:
+ * As of EFI 0.92 with the firmware I have on my
+ * machine this call does not seem to work quite
+ * right
+ *
+ * As of v1.10, this call always returns an unsupported status
+ */
+ status = efi.set_wakeup_time((efi_bool_t)wkalrm->enabled, &eft);
+
+ printk(KERN_WARNING "write status is %d\n", (int)status);
+
+ return status == EFI_SUCCESS ? 0 : -EINVAL;
+}
+
+static int efi_read_time(struct device *dev, struct rtc_time *tm)
+{
+ efi_status_t status;
+ efi_time_t eft;
+ efi_time_cap_t cap;
+
+ status = efi.get_time(&eft, &cap);
+
+ if (status != EFI_SUCCESS) {
+ /* should never happen */
+ printk(KERN_ERR "efitime: can't read time\n");
+ return -EINVAL;
+ }
+
+ convert_from_efi_time(&eft, tm);
+
+ return rtc_valid_tm(tm);
+}
+
+static int efi_set_time(struct device *dev, struct rtc_time *tm)
+{
+ efi_status_t status;
+ efi_time_t eft;
+
+ convert_to_efi_time(tm, &eft);
+
+ status = efi.set_time(&eft);
+
+ return status == EFI_SUCCESS ? 0 : -EINVAL;
+}
+
+static const struct rtc_class_ops efi_rtc_ops = {
+ .read_time = efi_read_time,
+ .set_time = efi_set_time,
+ .read_alarm = efi_read_alarm,
+ .set_alarm = efi_set_alarm,
+};
+
+static int __init efi_rtc_probe(struct platform_device *dev)
+{
+ struct rtc_device *rtc;
+
+ rtc = rtc_device_register("rtc-efi", &dev->dev, &efi_rtc_ops,
+ THIS_MODULE);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
+ platform_set_drvdata(dev, rtc);
+
+ return 0;
+}
+
+static int __exit efi_rtc_remove(struct platform_device *dev)
+{
+ struct rtc_device *rtc = platform_get_drvdata(dev);
+
+ rtc_device_unregister(rtc);
+
+ return 0;
+}
+
+static struct platform_driver efi_rtc_driver = {
+ .driver = {
+ .name = "rtc-efi",
+ .owner = THIS_MODULE,
+ },
+ .probe = efi_rtc_probe,
+ .remove = __exit_p(efi_rtc_remove),
+};
+
+static int __init efi_rtc_init(void)
+{
+ return platform_driver_probe(&efi_rtc_driver, efi_rtc_probe);
+}
+
+static void __exit efi_rtc_exit(void)
+{
+ platform_driver_unregister(&efi_rtc_driver);
+}
+
+module_init(efi_rtc_init);
+module_exit(efi_rtc_exit);
+
+MODULE_AUTHOR("dann frazier <dannf@...com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("EFI RTC driver");
--
1.5.6.5
--
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