From: Marek Vasut <marek.vasut@gmail.com>
Date: Tue, 15 Oct 2019 20:43:41 +0000 (+0200)
Subject: lib: time: Add microsecond timer
X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=80e7e7c2aba5793a1e39592cd53de9e5aca96f0b;p=u-boot.git

lib: time: Add microsecond timer

Add get_timer_us(), which is useful e.g. when we need higher
precision timestamps.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
[trini: Fixup arch/arm/mach-bcm283x/include/mach/timer.h]
Signed-off-by: Tom Rini <trini@konsulko.com>
---

diff --git a/arch/arm/mach-bcm283x/include/mach/timer.h b/arch/arm/mach-bcm283x/include/mach/timer.h
index 014355e759..61beb1aba1 100644
--- a/arch/arm/mach-bcm283x/include/mach/timer.h
+++ b/arch/arm/mach-bcm283x/include/mach/timer.h
@@ -25,9 +25,6 @@ struct bcm2835_timer_regs {
 	u32 c2;
 	u32 c3;
 };
-
-extern ulong get_timer_us(ulong base);
-
 #endif
 
 #endif
diff --git a/include/time.h b/include/time.h
index 1e9b369be7..a1149522ed 100644
--- a/include/time.h
+++ b/include/time.h
@@ -13,6 +13,7 @@ unsigned long get_timer(unsigned long base);
  * Granularity may be larger than 1us if hardware does not support this.
  */
 unsigned long timer_get_us(void);
+uint64_t get_timer_us(uint64_t base);
 
 /*
  * timer_test_add_offset()
diff --git a/lib/time.c b/lib/time.c
index f5751ab162..f30fc05804 100644
--- a/lib/time.c
+++ b/lib/time.c
@@ -134,6 +134,20 @@ ulong __weak get_timer(ulong base)
 	return tick_to_time(get_ticks()) - base;
 }
 
+static uint64_t notrace tick_to_time_us(uint64_t tick)
+{
+	ulong div = get_tbclk() / 1000;
+
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, div);
+	return tick;
+}
+
+uint64_t __weak get_timer_us(uint64_t base)
+{
+	return tick_to_time_us(get_ticks()) - base;
+}
+
 unsigned long __weak notrace timer_get_us(void)
 {
 	return tick_to_time(get_ticks() * 1000);