arch: arm: socfpga: timer_s10: Override udelay for secure section
Override __udelay() as 'always inlined' function so that PSCI code
run in '__secure' section can call this delay function as well.
Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
Signed-off-by: Dinesh Maniyam <dinesh.maniyam@intel.com>
Reviewed-by: Tien Fong Chee <tien.fong.chee@intel.com>
diff --git a/arch/arm/mach-socfpga/timer_s10.c b/arch/arm/mach-socfpga/timer_s10.c
index 7d5598e..84b13ce 100644
--- a/arch/arm/mach-socfpga/timer_s10.c
+++ b/arch/arm/mach-socfpga/timer_s10.c
@@ -1,11 +1,12 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * Copyright (C) 2017-2018 Intel Corporation <www.intel.com>
+ * Copyright (C) 2017-2022 Intel Corporation <www.intel.com>
*
*/
#include <common.h>
#include <init.h>
+#include <div64.h>
#include <asm/io.h>
#include <asm/arch/timer.h>
@@ -26,3 +27,34 @@
#endif
return 0;
}
+
+__always_inline u64 __get_time_stamp(void)
+{
+ u64 cntpct;
+
+ isb();
+ asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
+
+ return cntpct;
+}
+
+__always_inline uint64_t __usec_to_tick(unsigned long usec)
+{
+ u64 tick = usec;
+ u64 cntfrq;
+
+ asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq));
+ tick *= cntfrq;
+ do_div(tick, 1000000);
+
+ return tick;
+}
+
+__always_inline void __udelay(unsigned long usec)
+{
+ /* get current timestamp */
+ u64 tmp = __get_time_stamp() + __usec_to_tick(usec);
+
+ while (__get_time_stamp() < tmp + 1) /* loop till event */
+ ;
+}
\ No newline at end of file