From fa48d9e972858e0834b41db4ef7a30b0e332ed5f Mon Sep 17 00:00:00 2001
From: liwenxiang1 <liwenxiang1@xiaomi.com>
Date: Wed, 9 Oct 2024 19:28:45 +0800
Subject: [PATCH] drivers/timers:Arch_alarm and arch_timer add up_ndelay
 interface

Signed-off-by: liwenxiang1 <liwenxiang1@xiaomi.com>
---
 drivers/timers/arch_alarm.c | 23 +++++++++++++++++++----
 drivers/timers/arch_timer.c | 15 +++++++++++++++
 include/nuttx/arch.h        |  1 +
 3 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/drivers/timers/arch_alarm.c b/drivers/timers/arch_alarm.c
index d353a6d87a..759b266a35 100644
--- a/drivers/timers/arch_alarm.c
+++ b/drivers/timers/arch_alarm.c
@@ -50,14 +50,14 @@ static clock_t g_current_tick;
  * Private Functions
  ****************************************************************************/
 
-static void udelay_accurate(useconds_t microseconds)
+static void ndelay_accurate(unsigned long nanoseconds)
 {
   struct timespec now;
   struct timespec end;
   struct timespec delta;
 
   ONESHOT_CURRENT(g_oneshot_lower, &now);
-  clock_nsec2time(&delta, (uint64_t)microseconds * NSEC_PER_USEC);
+  clock_nsec2time(&delta, nanoseconds);
   clock_timespec_add(&now, &delta, &end);
 
   while (clock_timespec_compare(&now, &end) < 0)
@@ -426,13 +426,28 @@ void weak_function up_mdelay(unsigned int milliseconds)
  ****************************************************************************/
 
 void weak_function up_udelay(useconds_t microseconds)
+{
+  up_ndelay(NSEC_PER_USEC * microseconds);
+}
+
+/****************************************************************************
+ * Name: up_ndelay
+ *
+ * Description:
+ *   Delay inline for the requested number of nanoseconds.
+ *
+ *   *** NOT multi-tasking friendly ***
+ *
+ ****************************************************************************/
+
+void weak_function up_ndelay(unsigned long nanoseconds)
 {
   if (g_oneshot_lower != NULL)
     {
-      udelay_accurate(microseconds);
+      ndelay_accurate(nanoseconds);
     }
   else /* Oneshot timer hasn't been initialized yet */
     {
-      udelay_coarse(microseconds);
+      udelay_coarse((nanoseconds + NSEC_PER_USEC - 1) / NSEC_PER_USEC);
     }
 }
diff --git a/drivers/timers/arch_timer.c b/drivers/timers/arch_timer.c
index 850777c010..782eb7a39c 100644
--- a/drivers/timers/arch_timer.c
+++ b/drivers/timers/arch_timer.c
@@ -466,3 +466,18 @@ void weak_function up_udelay(useconds_t microseconds)
       udelay_coarse(microseconds);
     }
 }
+
+/****************************************************************************
+ * Name: up_ndelay
+ *
+ * Description:
+ *   Delay inline for the requested number of nanoseconds.
+ *
+ *   *** NOT multi-tasking friendly ***
+ *
+ ****************************************************************************/
+
+void weak_function up_ndelay(unsigned long nanoseconds)
+{
+  up_udelay((nanoseconds + NSEC_PER_USEC - 1) / NSEC_PER_USEC);
+}
diff --git a/include/nuttx/arch.h b/include/nuttx/arch.h
index e661ee2db0..16994ef714 100644
--- a/include/nuttx/arch.h
+++ b/include/nuttx/arch.h
@@ -2363,6 +2363,7 @@ char up_romgetc(FAR const char *ptr);
 
 void up_mdelay(unsigned int milliseconds);
 void up_udelay(useconds_t microseconds);
+void up_ndelay(unsigned long nanoseconds);
 
 /****************************************************************************
  * These are standard interfaces that are exported by the OS for use by the