tile: add an RTC driver for the Tilera hypervisor
This is a simple RTC driver that lets Tilera hardware boot up and
set the clock correctly.
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/drivers/rtc/rtc-tile.c b/drivers/rtc/rtc-tile.c
new file mode 100644
index 0000000..eb65daf
--- /dev/null
+++ b/drivers/rtc/rtc-tile.c
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2011 Tilera Corporation. All Rights Reserved.
+ *
+ * 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.
+ *
+ * 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, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ *
+ * Tilera-specific RTC driver.
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+
+/* Platform device pointer. */
+static struct platform_device *tile_rtc_platform_device;
+
+/*
+ * RTC read routine. Gets time info from RTC chip via hypervisor syscall.
+ */
+static int read_rtc_time(struct device *dev, struct rtc_time *tm)
+{
+ HV_RTCTime hvtm = hv_get_rtc();
+
+ tm->tm_sec = hvtm.tm_sec;
+ tm->tm_min = hvtm.tm_min;
+ tm->tm_hour = hvtm.tm_hour;
+ tm->tm_mday = hvtm.tm_mday;
+ tm->tm_mon = hvtm.tm_mon;
+ tm->tm_year = hvtm.tm_year;
+ tm->tm_wday = 0;
+ tm->tm_yday = 0;
+ tm->tm_isdst = 0;
+
+ if (rtc_valid_tm(tm) < 0)
+ dev_warn(dev, "Read invalid date/time from RTC\n");
+
+ return 0;
+}
+
+/*
+ * RTC write routine. Sends time info to hypervisor via syscall, to be
+ * written to RTC chip.
+ */
+static int set_rtc_time(struct device *dev, struct rtc_time *tm)
+{
+ HV_RTCTime hvtm;
+
+ hvtm.tm_sec = tm->tm_sec;
+ hvtm.tm_min = tm->tm_min;
+ hvtm.tm_hour = tm->tm_hour;
+ hvtm.tm_mday = tm->tm_mday;
+ hvtm.tm_mon = tm->tm_mon;
+ hvtm.tm_year = tm->tm_year;
+
+ hv_set_rtc(hvtm);
+
+ return 0;
+}
+
+/*
+ * RTC read/write ops.
+ */
+static const struct rtc_class_ops tile_rtc_ops = {
+ .read_time = read_rtc_time,
+ .set_time = set_rtc_time,
+};
+
+/*
+ * Device probe routine.
+ */
+static int __devinit tile_rtc_probe(struct platform_device *dev)
+{
+ struct rtc_device *rtc;
+
+ rtc = rtc_device_register("tile",
+ &dev->dev, &tile_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
+ platform_set_drvdata(dev, rtc);
+
+ return 0;
+}
+
+/*
+ * Device cleanup routine.
+ */
+static int __devexit tile_rtc_remove(struct platform_device *dev)
+{
+ struct rtc_device *rtc = platform_get_drvdata(dev);
+
+ if (rtc)
+ rtc_device_unregister(rtc);
+
+ platform_set_drvdata(dev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver tile_rtc_platform_driver = {
+ .driver = {
+ .name = "rtc-tile",
+ .owner = THIS_MODULE,
+ },
+ .probe = tile_rtc_probe,
+ .remove = __devexit_p(tile_rtc_remove),
+};
+
+/*
+ * Driver init routine.
+ */
+static int __init tile_rtc_driver_init(void)
+{
+ int err;
+
+ err = platform_driver_register(&tile_rtc_platform_driver);
+ if (err)
+ return err;
+
+ tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0);
+ if (tile_rtc_platform_device == NULL) {
+ err = -ENOMEM;
+ goto exit_driver_unregister;
+ }
+
+ err = platform_device_add(tile_rtc_platform_device);
+ if (err)
+ goto exit_device_put;
+
+ return 0;
+
+exit_device_put:
+ platform_device_put(tile_rtc_platform_device);
+
+exit_driver_unregister:
+ platform_driver_unregister(&tile_rtc_platform_driver);
+ return err;
+}
+
+/*
+ * Driver cleanup routine.
+ */
+static void __exit tile_rtc_driver_exit(void)
+{
+ platform_driver_unregister(&tile_rtc_platform_driver);
+}
+
+module_init(tile_rtc_driver_init);
+module_exit(tile_rtc_driver_exit);
+
+MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rtc-tile");