Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / rtc / rtc-tile.c

diff --git a/kernel/drivers/rtc/rtc-tile.c b/kernel/drivers/rtc/rtc-tile.c
new file mode 100644 (file)
index 0000000..0b60867
--- /dev/null
+++ b/kernel/drivers/rtc/rtc-tile.c
@@ -0,0 +1,146 @@
+/*
+ * 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 tile_rtc_probe(struct platform_device *dev)
+{
+       struct rtc_device *rtc;
+
+       rtc = devm_rtc_device_register(&dev->dev, "tile",
+                               &tile_rtc_ops, THIS_MODULE);
+
+       if (IS_ERR(rtc))
+               return PTR_ERR(rtc);
+
+       platform_set_drvdata(dev, rtc);
+
+       return 0;
+}
+
+static struct platform_driver tile_rtc_platform_driver = {
+       .driver         = {
+               .name   = "rtc-tile",
+       },
+       .probe          = tile_rtc_probe,
+};
+
+/*
+ * 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_device_unregister(tile_rtc_platform_device);
+       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");