rtc: ia64: allow other architectures to use EFI RTC

Currently, the rtc-efi driver is restricted to ia64 only.  Newer
architectures with EFI support may want to also use that driver.  This
patch moves the platform device setup from ia64 into drivers/rtc and
allow any architecture with CONFIG_EFI=y to use the rtc-efi driver.

Signed-off-by: Mark Salter <msalter@redhat.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 36 insertions, 1 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index a672dd16da62..83743a1a6731 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -798,7 +798,7 @@ config RTC_DRV_DA9063
 
 config RTC_DRV_EFI
         tristate "EFI RTC"
-        depends on IA64
+        depends on EFI
         help
           If you say yes here you will get support for the EFI
           Real Time Clock.
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 70347d041d10..f1dfc3648ee5 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -10,6 +10,10 @@ obj-$(CONFIG_RTC_SYSTOHC)	+= systohc.o
 obj-$(CONFIG_RTC_CLASS)         += rtc-core.o
 rtc-core-y                      := class.o interface.o
 
+ifdef CONFIG_RTC_DRV_EFI
+rtc-core-y                      += rtc-efi-platform.o
+endif
+
 rtc-core-$(CONFIG_RTC_INTF_DEV) += rtc-dev.o
 rtc-core-$(CONFIG_RTC_INTF_PROC) += rtc-proc.o
 rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
diff --git a/drivers/rtc/rtc-efi-platform.c b/drivers/rtc/rtc-efi-platform.c
new file mode 100644
index 000000000000..b40fbe332af4
--- /dev/null
+++ b/drivers/rtc/rtc-efi-platform.c
@@ -0,0 +1,31 @@
+/*
+ * Moved from arch/ia64/kernel/time.c
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ *      Stephane Eranian <eranian@hpl.hp.com>
+ *      David Mosberger <davidm@hpl.hp.com>
+ * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
+ * Copyright (C) 1999-2000 VA Linux Systems
+ * Copyright (C) 1999-2000 Walt Drummond <drummond@valinux.com>
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/efi.h>
+#include <linux/platform_device.h>
+
+static struct platform_device rtc_efi_dev = {
+        .name = "rtc-efi",
+        .id = -1,
+};
+
+static int __init rtc_init(void)
+{
+        if (efi_enabled(EFI_RUNTIME_SERVICES))
+                if (platform_device_register(&rtc_efi_dev) < 0)
+                        pr_err("unable to register rtc device...\n");
+
+        /* not necessarily an error */
+        return 0;
+}
+module_init(rtc_init);