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authorBiju Das <biju.das.jz@bp.renesas.com>2020-12-16 10:46:36 +0000
committerBiju Das <biju.das.jz@bp.renesas.com>2021-01-13 13:03:48 +0000
commitcdcf1f1492dd05b8f9038e1bbdd091e93c153a3c (patch)
treefa242ea0c4ce8695dfd499157eae556cb1feb3ef /drivers/renesas/common/delay/micro_delay.c
parent865e34741b02b3a9ddf9f652f2649407f33debb0 (diff)
downloadtrusted-firmware-a-cdcf1f1492dd05b8f9038e1bbdd091e93c153a3c.tar.gz
drivers: renesas: delay: Move to common
Move delay driver code to common directory, so that the same code can be re-used by both R-Car Gen3 and RZ/G2 platforms. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Change-Id: I5e806bd0e0a0a4b436048513b7089db90ff9805f
Diffstat (limited to 'drivers/renesas/common/delay/micro_delay.c')
-rw-r--r--drivers/renesas/common/delay/micro_delay.c31
1 files changed, 31 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;
+ }
+}