[PATCH 08/10] goldfish: real time clock

From: Alan Cox
Date: Wed Jan 09 2013 - 09:05:32 EST

From: Arve HjÃnnevÃg <arve@xxxxxxxxxx>

Gets the current time from the host. Alarms are not supported yet.

Signed-off-by: Mike A. Chan <mikechan@xxxxxxxxxx>
Signed-off-by: Arve HjÃnnevÃg <arve@xxxxxxxxxxx>
[Ported to 3.4]
Signed-off-by: Tom Keel <thomas.keel@xxxxxxxxx>
[Cleaned up to use ioremap, types, unload etc]
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
---

arch/x86/include/asm/goldfish.h | 7 ++
drivers/rtc/Kconfig | 9 ++
drivers/rtc/Makefile | 1
drivers/rtc/rtc-goldfish.c | 144 +++++++++++++++++++++++++++++++++++++++
4 files changed, 161 insertions(+)
create mode 100644 drivers/rtc/rtc-goldfish.c


diff --git a/arch/x86/include/asm/goldfish.h b/arch/x86/include/asm/goldfish.h
index 8d2c559..63fd315 100644
--- a/arch/x86/include/asm/goldfish.h
+++ b/arch/x86/include/asm/goldfish.h
@@ -30,4 +30,11 @@

#define GOLDFISH_TTY_BASE (0x2000)

+#define GOLDFISH_TIME_LOW 0x00
+#define GOLDFISH_TIME_HIGH 0x04
+#define GOLDFISH_ALARM_LOW 0x08
+#define GOLDFISH_ALARM_HIGH 0x0C
+#define GOLDFISH_CLEAR_TIMER_INT 0x10
+#define GOLDFISH_CLEAR_ALARM 0x14
+
#endif
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e4dfa5e..4f7f835 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -982,6 +982,15 @@ config RTC_DRV_BFIN
This driver can also be built as a module. If so, the module
will be called rtc-bfin.

+config RTC_DRV_GOLDFISH
+ tristate "GOLDFISH"
+ depends on GOLDFISH
+ help
+ RTC driver for Goldfish Virtual Platform
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-goldfish.
+
config RTC_DRV_RS5C313
tristate "Ricoh RS5C313"
depends on SH_LANDISK
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index b1715e9..03401e4 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_RTC_DRV_EM3027) += rtc-em3027.o
obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
obj-$(CONFIG_RTC_DRV_FM3130) += rtc-fm3130.o
obj-$(CONFIG_RTC_DRV_GENERIC) += rtc-generic.o
+obj-$(CONFIG_RTC_DRV_GOLDFISH) += rtc-goldfish.o
obj-$(CONFIG_RTC_DRV_HID_SENSOR_TIME) += rtc-hid-sensor-time.o
obj-$(CONFIG_RTC_DRV_IMXDI) += rtc-imxdi.o
obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o
diff --git a/drivers/rtc/rtc-goldfish.c b/drivers/rtc/rtc-goldfish.c
new file mode 100644
index 0000000..52fef9c
--- /dev/null
+++ b/drivers/rtc/rtc-goldfish.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (C) 2012 Intel, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+
+#include <asm/goldfish.h>
+
+struct goldfish_rtc {
+ void __iomem *base;
+ u32 irq;
+ struct rtc_device *rtc;
+};
+
+static irqreturn_t goldfish_rtc_interrupt(int irq, void *dev_id)
+{
+ struct goldfish_rtc *qrtc = dev_id;
+ unsigned long events = 0;
+
+ writel(1, qrtc->base + GOLDFISH_CLEAR_TIMER_INT);
+ events = RTC_IRQF | RTC_AF;
+
+ rtc_update_irq(qrtc->rtc, 1, events);
+
+ return IRQ_HANDLED;
+}
+
+static int goldfish_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ int64_t time;
+ struct goldfish_rtc *qrtc = platform_get_drvdata(
+ to_platform_device(dev));
+
+ time = readl(qrtc->base + GOLDFISH_TIME_LOW);
+ time |= (int64_t)readl(qrtc->base + GOLDFISH_TIME_HIGH) << 32;
+ do_div(time, NSEC_PER_SEC);
+
+ rtc_time_to_tm(time, tm);
+ return 0;
+}
+
+static const struct rtc_class_ops goldfish_rtc_ops = {
+ .read_time = goldfish_rtc_read_time,
+};
+
+static int goldfish_rtc_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct resource *r;
+ struct goldfish_rtc *qrtc;
+
+ qrtc = kzalloc(sizeof(*qrtc), GFP_KERNEL);
+ if (qrtc == NULL) {
+ ret = -ENOMEM;
+ goto err_qrtc_alloc_failed;
+ }
+ platform_set_drvdata(pdev, qrtc);
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (r == NULL) {
+ ret = -ENODEV;
+ goto err_no_io_base;
+ }
+ qrtc->base = ioremap(r->start, 0x18);
+ if (qrtc->base == NULL) {
+ ret = -ENOMEM;
+ goto err_no_io_base;
+ }
+ qrtc->irq = platform_get_irq(pdev, 0);
+ if (qrtc->irq < 0) {
+ ret = -ENODEV;
+ goto err_no_irq;
+ }
+ qrtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
+ &goldfish_rtc_ops, THIS_MODULE);
+ if (IS_ERR(qrtc->rtc)) {
+ ret = PTR_ERR(qrtc->rtc);
+ goto err_rtc_device_register_failed;
+ }
+
+ ret = request_irq(qrtc->irq, goldfish_rtc_interrupt, 0, pdev->name, qrtc);
+ if (ret)
+ goto request_irq;
+
+ return 0;
+
+ free_irq(qrtc->irq, qrtc);
+request_irq:
+ rtc_device_unregister(qrtc->rtc);
+err_rtc_device_register_failed:
+err_no_irq:
+ iounmap(qrtc->base);
+err_no_io_base:
+ kfree(qrtc);
+err_qrtc_alloc_failed:
+ return ret;
+}
+
+static int goldfish_rtc_remove(struct platform_device *pdev)
+{
+ struct goldfish_rtc *qrtc = platform_get_drvdata(pdev);
+ free_irq(qrtc->irq, qrtc);
+ rtc_device_unregister(qrtc->rtc);
+ iounmap(qrtc->base);
+ kfree(qrtc);
+ return 0;
+}
+
+static struct platform_driver goldfish_timer = {
+ .probe = goldfish_rtc_probe,
+ .remove = goldfish_rtc_remove,
+ .driver = {
+ .name = "goldfish_rtc"
+ }
+};
+
+static int __devinit goldfish_rtc_init(void)
+{
+ return platform_driver_register(&goldfish_timer);
+}
+
+static void goldfish_rtc_exit(void)
+{
+ return platform_driver_unregister(&goldfish_timer);
+}
+
+module_init(goldfish_rtc_init);
+module_exit(goldfish_rtc_exit);

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