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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH 04/15] ARM: Add arm64 pbl udelay
Date: Wed, 13 Mar 2019 10:41:51 +0100	[thread overview]
Message-ID: <20190313094202.14901-5-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20190313094202.14901-1-s.hauer@pengutronix.de>

PBL often needs a way to udelay execution. Since we have a generic timer
in ARMv8 we can implement a generic udelay.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm/lib64/Makefile |  2 +-
 arch/arm/lib64/pbl.c    | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/lib64/pbl.c

diff --git a/arch/arm/lib64/Makefile b/arch/arm/lib64/Makefile
index 4c0019fabe..5068431342 100644
--- a/arch/arm/lib64/Makefile
+++ b/arch/arm/lib64/Makefile
@@ -6,4 +6,4 @@ obj-$(CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS)	+= memset.o string.o
 extra-y += barebox.lds
 obj-pbl-y   += runtime-offset.o
 
-pbl-y	+= div0.o
+pbl-y	+= div0.o pbl.o
diff --git a/arch/arm/lib64/pbl.c b/arch/arm/lib64/pbl.c
new file mode 100644
index 0000000000..0cef08e4d2
--- /dev/null
+++ b/arch/arm/lib64/pbl.c
@@ -0,0 +1,17 @@
+#include <asm/system.h>
+#include <clock.h>
+#include <common.h>
+
+void udelay(unsigned long us)
+{
+	unsigned long cntfrq = get_cntfrq();
+	unsigned long ticks = (us * cntfrq) / 1000000;
+	unsigned long start = get_cntpct();
+
+	while ((long)(start + ticks - get_cntpct()) > 0);
+}
+
+void mdelay(unsigned long ms)
+{
+	udelay(ms * 1000);
+}
-- 
2.20.1


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  parent reply	other threads:[~2019-03-13  9:42 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-13  9:41 [PATCH 00/15] barebox Layerscape support Sascha Hauer
2019-03-13  9:41 ` [PATCH 01/15] mci: imx-esdhc: Actually enable cache snooping Sascha Hauer
2019-03-13  9:41 ` [PATCH 02/15] Add Freescale QUICC Engine firmware support Sascha Hauer
2019-03-13  9:41 ` [PATCH 03/15] net: Add Freescale FMan ethernet support Sascha Hauer
2019-03-13  9:41 ` Sascha Hauer [this message]
2019-03-19 18:12   ` [PATCH 04/15] ARM: Add arm64 pbl udelay Andrey Smirnov
2019-03-20  8:16     ` Sascha Hauer
2019-03-22  6:41       ` Andrey Smirnov
2019-03-13  9:41 ` [PATCH 05/15] esdhc-xload: Add support for Layerscape Sascha Hauer
2019-03-13  9:41 ` [PATCH 06/15] watchdog: imx: Add register accessor functions Sascha Hauer
2019-03-13  9:41 ` [PATCH 07/15] watchdog: imx: Add big endian register access support Sascha Hauer
2019-03-13  9:41 ` [PATCH 08/15] scripts: Add Layerscape image tool Sascha Hauer
2019-03-13  9:41 ` [PATCH 09/15] i2c: i.MX: Add layerscape support Sascha Hauer
2019-03-13  9:41 ` [PATCH 10/15] ddr: fsl: Add Freescale ddr driver Sascha Hauer
2019-03-13  9:41 ` [PATCH 11/15] ARM: Add basic Layerscape support Sascha Hauer
2019-03-13  9:41 ` [PATCH 12/15] clk: Add Layerscape clk support Sascha Hauer
2019-03-13  9:42 ` [PATCH 13/15] ARM: Layerscape: Add LS1046a RDB board support Sascha Hauer
2019-03-13  9:42 ` [PATCH 14/15] ARM: Layerscape: Add TQ TQMLS1046a " Sascha Hauer
2019-03-13  9:42 ` [PATCH 15/15] ARM: Add layerscape_defconfig Sascha Hauer

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