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path: root/plat/mediatek/common/drivers/rtc/rtc_common.c
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Diffstat (limited to 'plat/mediatek/common/drivers/rtc/rtc_common.c')
-rw-r--r--plat/mediatek/common/drivers/rtc/rtc_common.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/plat/mediatek/common/drivers/rtc/rtc_common.c b/plat/mediatek/common/drivers/rtc/rtc_common.c
new file mode 100644
index 000000000..cad12a03b
--- /dev/null
+++ b/plat/mediatek/common/drivers/rtc/rtc_common.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2019, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/debug.h>
+#include <drivers/delay_timer.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
+};
+
+uint16_t RTC_Read(uint32_t addr)
+{
+ uint32_t rdata = 0;
+
+ pwrap_read((uint32_t)addr, &rdata);
+ return (uint16_t)rdata;
+}
+
+void RTC_Write(uint32_t addr, uint16_t data)
+{
+ pwrap_write((uint32_t)addr, (uint32_t)data);
+}
+
+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;
+}
+
+int32_t RTC_Write_Trigger(void)
+{
+ RTC_Write(RTC_WRTGR, 1);
+ return rtc_busy_wait();
+}
+
+int32_t Writeif_unlock(void)
+{
+ RTC_Write(RTC_PROT, RTC_PROT_UNLOCK1);
+ if (!RTC_Write_Trigger())
+ return 0;
+ RTC_Write(RTC_PROT, RTC_PROT_UNLOCK2);
+ if (!RTC_Write_Trigger())
+ return 0;
+
+ return 1;
+}
+