1 files changed, 102 insertions, 0 deletions
diff --git a/plat/mediatek/mt8173/drivers/rtc/rtc.c b/plat/mediatek/mt8173/drivers/rtc/rtc.c
new file mode 100644
index 00000000..e171863d
--- /dev/null
+++ b/plat/mediatek/mt8173/drivers/rtc/rtc.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <assert.h>
+#include <debug.h>
+#include <delay_timer.h>
+#include <mt8173_def.h>
+#include <pmic_wrap_init.h>
+#include <rtc.h>
+
+/* RTC busy status polling interval and retry count */
+enum {
+	RTC_WRTGR_POLLING_DELAY_MS	= 10,
+	RTC_WRTGR_POLLING_CNT		= 100
+};
+
+static uint16_t RTC_Read(uint32_t addr)
+{
+	uint32_t rdata = 0;
+
+	pwrap_read((uint32_t)addr, &rdata);
+	return (uint16_t)rdata;
+}
+
+static void RTC_Write(uint32_t addr, uint16_t data)
+{
+	pwrap_write((uint32_t)addr, (uint32_t)data);
+}
+
+static inline int32_t rtc_busy_wait(void)
+{
+	uint64_t retry = RTC_WRTGR_POLLING_CNT;
+
+	do {
+		mdelay(RTC_WRTGR_POLLING_DELAY_MS);
+		if (!(RTC_Read(RTC_BBPU) & RTC_BBPU_CBUSY))
+			return 1;
+		retry--;
+	} while (retry);
+
+	ERROR("[RTC] rtc cbusy time out!\n");
+	return 0;
+}
+
+static int32_t Write_trigger(void)
+{
+	RTC_Write(RTC_WRTGR, 1);
+	return rtc_busy_wait();
+}
+
+static int32_t Writeif_unlock(void)
+{
+	RTC_Write(RTC_PROT, RTC_PROT_UNLOCK1);
+	if (!Write_trigger())
+		return 0;
+	RTC_Write(RTC_PROT, RTC_PROT_UNLOCK2);
+	if (!Write_trigger())
+		return 0;
+
+	return 1;
+}
+
+void rtc_bbpu_power_down(void)
+{
+	uint16_t bbpu;
+
+	/* pull PWRBB low */
+	bbpu = RTC_BBPU_KEY | RTC_BBPU_AUTO | RTC_BBPU_PWREN;
+	if (Writeif_unlock()) {
+		RTC_Write(RTC_BBPU, bbpu);
+		if (!Write_trigger())
+			assert(1);
+	} else {
+		assert(1);
+	}
+}