From b71a1f77c30efa1cf12f4e761c92702c19823a8b Mon Sep 17 00:00:00 2001
From: zhuyanlin <zhuyanlin1@xiaomi.com>
Date: Mon, 25 Apr 2022 14:52:35 +0800
Subject: [PATCH] xtensa: add perf counter

Signed-off-by: zhuyanlin <zhuyanlin1@xiaomi.com>
---
 arch/xtensa/src/common/xtensa_perf.c | 63 ++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 arch/xtensa/src/common/xtensa_perf.c

diff --git a/arch/xtensa/src/common/xtensa_perf.c b/arch/xtensa/src/common/xtensa_perf.c
new file mode 100644
index 00000000000..7063e996fc7
--- /dev/null
+++ b/arch/xtensa/src/common/xtensa_perf.c
@@ -0,0 +1,63 @@
+/****************************************************************************
+ * arch/xtensa/src/common/xtensa_perf.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/arch.h>
+#include <nuttx/clock.h>
+
+#include "xtensa_counter.h"
+#include "xtensa.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static uint32_t g_cpu_freq;
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+void up_perf_init(void *arg)
+{
+  g_cpu_freq = (uint32_t)(uintptr_t)arg;
+}
+
+uint32_t up_perf_getfreq(void)
+{
+  return g_cpu_freq;
+}
+
+uint32_t up_perf_gettime(void)
+{
+  return xtensa_getcount();
+}
+
+void up_perf_convert(uint32_t elapsed, struct timespec *ts)
+{
+  uint32_t left;
+
+  ts->tv_sec  = elapsed / g_cpu_freq;
+  left        = elapsed - ts->tv_sec * g_cpu_freq;
+  ts->tv_nsec = NSEC_PER_SEC * (uint64_t)left / g_cpu_freq;
+}