powerpc/ps3: Add rtc-ps3

Create a real RTC driver for PS3, and unhook the deprecated
ppc_md.[gs]et_rtc_time.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Acked-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

3 files changed, 114 insertions, 0 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index fa66d10dd5a0..b072826c9ee1 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -741,4 +741,13 @@ config RTC_DRV_MV
           This driver can also be built as a module. If so, the module
           will be called rtc-mv.
 
+config RTC_DRV_PS3
+        tristate "PS3 RTC"
+        depends on PPC_PS3
+        help
+          If you say yes here you will get support for the RTC on PS3.
+
+          This driver can also be built as a module. If so, the module
+          will be called rtc-ps3.
+
 endif # RTC_CLASS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 2b022f19a6ed..6c0639a14f09 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -76,3 +76,4 @@ obj-$(CONFIG_RTC_DRV_VR41XX)	+= rtc-vr41xx.o
 obj-$(CONFIG_RTC_DRV_WM8350)    += rtc-wm8350.o
 obj-$(CONFIG_RTC_DRV_X1205)     += rtc-x1205.o
 obj-$(CONFIG_RTC_DRV_PCF50633)  += rtc-pcf50633.o
+obj-$(CONFIG_RTC_DRV_PS3)       += rtc-ps3.o
diff --git a/drivers/rtc/rtc-ps3.c b/drivers/rtc/rtc-ps3.c
new file mode 100644
index 000000000000..968133ce1ee8
--- /dev/null
+++ b/drivers/rtc/rtc-ps3.c
@@ -0,0 +1,104 @@
+/*
+ * PS3 RTC Driver
+ *
+ * Copyright 2009 Sony Corporation
+ *
+ * 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; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+
+#include <asm/lv1call.h>
+#include <asm/ps3.h>
+
+
+static u64 read_rtc(void)
+{
+        int result;
+        u64 rtc_val;
+        u64 tb_val;
+
+        result = lv1_get_rtc(&rtc_val, &tb_val);
+        BUG_ON(result);
+
+        return rtc_val;
+}
+
+static int ps3_get_time(struct device *dev, struct rtc_time *tm)
+{
+        rtc_time_to_tm(read_rtc() + ps3_os_area_get_rtc_diff(), tm);
+        return rtc_valid_tm(tm);
+}
+
+static int ps3_set_time(struct device *dev, struct rtc_time *tm)
+{
+        unsigned long now;
+
+        rtc_tm_to_time(tm, &now);
+        ps3_os_area_set_rtc_diff(now - read_rtc());
+        return 0;
+}
+
+static const struct rtc_class_ops ps3_rtc_ops = {
+        .read_time = ps3_get_time,
+        .set_time = ps3_set_time,
+};
+
+static int __init ps3_rtc_probe(struct platform_device *dev)
+{
+        struct rtc_device *rtc;
+
+        rtc = rtc_device_register("rtc-ps3", &dev->dev, &ps3_rtc_ops,
+                                  THIS_MODULE);
+        if (IS_ERR(rtc))
+                return PTR_ERR(rtc);
+
+        platform_set_drvdata(dev, rtc);
+        return 0;
+}
+
+static int __exit ps3_rtc_remove(struct platform_device *dev)
+{
+        rtc_device_unregister(platform_get_drvdata(dev));
+        return 0;
+}
+
+static struct platform_driver ps3_rtc_driver = {
+        .driver = {
+                .name = "rtc-ps3",
+                .owner = THIS_MODULE,
+        },
+        .remove = __exit_p(ps3_rtc_remove),
+};
+
+static int __init ps3_rtc_init(void)
+{
+        return platform_driver_probe(&ps3_rtc_driver, ps3_rtc_probe);
+}
+
+static void __exit ps3_rtc_fini(void)
+{
+        platform_driver_unregister(&ps3_rtc_driver);
+}
+
+module_init(ps3_rtc_init);
+module_exit(ps3_rtc_fini);
+
+MODULE_AUTHOR("Sony Corporation");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ps3 RTC driver");
+MODULE_ALIAS("platform:rtc-ps3");