timer: riscv_aclint_timer: add timer_get_boot_us for BOOTSTAGE
timer_get_boot_us function is required to record the boot stages as
us-based timestamp.
To get a micro-second time from a timer tick, this converts the
formula like below to avoid zero result of (tick / rate) part.
From: time(us) = (tick / rate) * 1000000
To : time(us) = (tick * 1000) / (rate / 1000)
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/drivers/timer/riscv_aclint_timer.c b/drivers/timer/riscv_aclint_timer.c
index e29d527..73fb879 100644
--- a/drivers/timer/riscv_aclint_timer.c
+++ b/drivers/timer/riscv_aclint_timer.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <clk.h>
+#include <div64.h>
#include <dm.h>
#include <timer.h>
#include <asm/io.h>
@@ -44,6 +45,28 @@
}
#endif
+#if CONFIG_IS_ENABLED(RISCV_MMODE) && CONFIG_IS_ENABLED(BOOTSTAGE)
+ulong timer_get_boot_us(void)
+{
+ int ret;
+ u64 ticks = 0;
+ u32 rate;
+
+ ret = dm_timer_init();
+ if (!ret) {
+ rate = timer_get_rate(gd->timer);
+ timer_get_count(gd->timer, &ticks);
+ } else {
+ rate = RISCV_MMODE_TIMER_FREQ;
+ ticks = readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE,
+ RISCV_MMODE_TIMEROFF));
+ }
+
+ /* Below is converted from time(us) = (tick / rate) * 10000000 */
+ return lldiv(ticks * 1000, (rate / 1000));
+}
+#endif
+
static const struct timer_ops riscv_aclint_timer_ops = {
.get_count = riscv_aclint_timer_get_count,
};