Subject: [PATCH 1/3] ARM:lib32: add architected timer
In preparation for the introduction of the LS1021A support,
add a specific timer support based on the LS1046A support so
that delays can be used in the PBL.
Signed-off-by: Renaud Barbier <renaud.barbier@xxxxxxxxxx>
---
arch/arm/lib32/Makefile | 1 +
arch/arm/lib32/pbl.c | 17 +++++++++++++++++
include/clock.h | 2 ++
3 files changed, 20 insertions(+)
create mode 100644 arch/arm/lib32/pbl.c
diff --git a/arch/arm/lib32/Makefile b/arch/arm/lib32/Makefile
index 82507fffc0..1be8d70c45 100644
--- a/arch/arm/lib32/Makefile
+++ b/arch/arm/lib32/Makefile
@@ -31,6 +31,7 @@ extra-y += barebox.lds
pbl-y += lib1funcs.o
pbl-y += ashldi3.o
pbl-y += div0.o
+pbl-y += pbl.o
obj-pbl-y += setjmp.o
diff --git a/arch/arm/lib32/pbl.c b/arch/arm/lib32/pbl.c
new file mode 100644
index 0000000000..83b49656cb
--- /dev/null
+++ b/arch/arm/lib32/pbl.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <asm/system.h>
+#include <clock.h>
+#include <common.h>
+
+/* Unlike the ARMv8, the timer is not generic to ARM32 */
+void arm_architected_timer_udelay(unsigned long us)
+{
+ unsigned long long ticks, cntfrq = get_cntfrq();
+ unsigned long long start = get_cntpct();
+
+ ticks = us * cntfrq + 999999;
+ do_div(ticks, 1000000);
+
+ while ((long)(start + ticks - get_cntpct()) > 0);
+}
diff --git a/include/clock.h b/include/clock.h
index e6197e7eb0..8e07c35d37 100644
--- a/include/clock.h
+++ b/include/clock.h
@@ -35,6 +35,8 @@ uint32_t clocksource_hz2mult(uint32_t hz, uint32_t shift_constant);
int is_timeout(uint64_t start_ns, uint64_t time_offset_ns);
int is_timeout_non_interruptible(uint64_t start_ns, uint64_t time_offset_ns);
+void arm_architected_timer_udelay(unsigned long us);
+
void ndelay(unsigned long nsecs);
void udelay(unsigned long usecs);
void mdelay(unsigned long msecs);
--
2.27.0
