lib: time: Add microsecond timer

[oweals/u-boot.git] / lib / time.c

diff --git a/lib/time.c b/lib/time.c
index b001745203e85c2c6f944e5d470291660eae0af6..f30fc05804be9914d55973bd6163f1c46b0e30f8 100644 (file)
--- a/lib/time.c
+++ b/lib/time.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2000-2009
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #include <common.h>
@@ -36,47 +35,61 @@ unsigned long notrace timer_read_counter(void)
        return readl(CONFIG_SYS_TIMER_COUNTER);
 #endif
 }
+
+ulong timer_get_boot_us(void)
+{
+       ulong count = timer_read_counter();
+
+#if CONFIG_SYS_TIMER_RATE == 1000000
+       return count;
+#elif CONFIG_SYS_TIMER_RATE > 1000000
+       return lldiv(count, CONFIG_SYS_TIMER_RATE / 1000000);
+#elif defined(CONFIG_SYS_TIMER_RATE)
+       return (unsigned long long)count * 1000000 / CONFIG_SYS_TIMER_RATE;
+#else
+       /* Assume the counter is in microseconds */
+       return count;
+#endif
+}
+
 #else
 extern unsigned long __weak timer_read_counter(void);
 #endif
 
-#ifdef CONFIG_TIMER
-static int notrace dm_timer_init(void)
+#if CONFIG_IS_ENABLED(TIMER)
+ulong notrace get_tbclk(void)
 {
-       struct udevice *dev;
-       int ret;
-
        if (!gd->timer) {
-               ret = uclass_first_device(UCLASS_TIMER, &dev);
+#ifdef CONFIG_TIMER_EARLY
+               return timer_early_get_rate();
+#else
+               int ret;
+
+               ret = dm_timer_init();
                if (ret)
                        return ret;
-               if (!dev)
-                       return -ENODEV;
-               gd->timer = dev;
+#endif
        }
 
-       return 0;
-}
-
-ulong notrace get_tbclk(void)
-{
-       int ret;
-
-       ret = dm_timer_init();
-       if (ret)
-               return ret;
-
        return timer_get_rate(gd->timer);
 }
 
-unsigned long notrace timer_read_counter(void)
+uint64_t notrace get_ticks(void)
 {
-       unsigned long count;
+       u64 count;
        int ret;
 
-       ret = dm_timer_init();
-       if (ret)
-               return ret;
+       if (!gd->timer) {
+#ifdef CONFIG_TIMER_EARLY
+               return timer_early_get_count();
+#else
+               int ret;
+
+               ret = dm_timer_init();
+               if (ret)
+                       return ret;
+#endif
+       }
 
        ret = timer_get_count(gd->timer, &count);
        if (ret)
@@ -84,7 +97,8 @@ unsigned long notrace timer_read_counter(void)
 
        return count;
 }
-#endif /* CONFIG_TIMER */
+
+#else /* !CONFIG_TIMER */
 
 uint64_t __weak notrace get_ticks(void)
 {
@@ -97,6 +111,8 @@ uint64_t __weak notrace get_ticks(void)
        return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
 }
 
+#endif /* CONFIG_TIMER */
+
 /* Returns time in milliseconds */
 static uint64_t notrace tick_to_time(uint64_t tick)
 {
@@ -118,12 +134,26 @@ 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);
 }
 
-static uint64_t usec_to_tick(unsigned long usec)
+uint64_t usec_to_tick(unsigned long usec)
 {
        uint64_t tick = usec;
        tick *= get_tbclk();
@@ -154,9 +184,3 @@ void udelay(unsigned long usec)
                usec -= kv;
        } while(usec);
 }
-
-void mdelay(unsigned long msec)
-{
-       while (msec--)
-               udelay(1000);
-}