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Diffstat (limited to 'drivers/renesas/common/delay')
-rw-r--r--drivers/renesas/common/delay/micro_delay.c31
-rw-r--r--drivers/renesas/common/delay/micro_delay.h15
2 files changed, 46 insertions, 0 deletions
diff --git a/drivers/renesas/common/delay/micro_delay.c b/drivers/renesas/common/delay/micro_delay.c
new file mode 100644
index 0000000000..a5e2a69285
--- /dev/null
+++ b/drivers/renesas/common/delay/micro_delay.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2018-2020, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_helpers.h>
+
+#include "micro_delay.h"
+
+#define RCAR_CONV_MICROSEC 1000000U
+
+void
+#if IMAGE_BL31
+ __attribute__ ((section(".system_ram")))
+#endif
+ rcar_micro_delay(uint64_t micro_sec)
+{
+ uint64_t freq;
+ uint64_t base_count;
+ uint64_t get_count;
+ uint64_t wait_time = 0U;
+
+ freq = read_cntfrq_el0();
+ base_count = read_cntpct_el0();
+ while (micro_sec > wait_time) {
+ get_count = read_cntpct_el0();
+ wait_time = ((get_count - base_count) * RCAR_CONV_MICROSEC) / freq;
+ }
+}
diff --git a/drivers/renesas/common/delay/micro_delay.h b/drivers/renesas/common/delay/micro_delay.h
new file mode 100644
index 0000000000..37b71f80a6
--- /dev/null
+++ b/drivers/renesas/common/delay/micro_delay.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2015-2017, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MICRO_DELAY_H
+#define MICRO_DELAY_H
+
+#ifndef __ASSEMBLER__
+#include <stdint.h>
+void rcar_micro_delay(uint64_t micro_sec);
+#endif
+
+#endif /* MICRO_DELAY_H */