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raw | patch | inline | side by side (parent: d10f68a)
author | David Andrey <david.andrey@netmodule.com> | |
Fri, 7 Dec 2012 15:51:32 +0000 (16:51 +0100) | ||
committer | Michal Simek <michal.simek@xilinx.com> | |
Tue, 30 Apr 2013 09:39:10 +0000 (11:39 +0200) |
Rework the __udelay function of U-Boot Zynq Arch to handle
delay < 1000 usec
Signed-off-by: David Andrey <david.andrey@netmodule.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@ti.com>
delay < 1000 usec
Signed-off-by: David Andrey <david.andrey@netmodule.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@ti.com>
arch/arm/cpu/armv7/zynq/timer.c | patch | blob | history |
index 45b405a4ba2a764831615a24ecd86d2cb6214466..5d8bb24096e7212f71688c84c160cb16be02efbc 100644 (file)
void __udelay(unsigned long usec)
{
- unsigned long long tmp;
- ulong tmo;
-
- tmo = usec / (1000000 / CONFIG_SYS_HZ);
- tmp = get_ticks() + tmo; /* Get current timestamp */
-
- while (get_ticks() < tmp) { /* Loop till event */
- /* NOP */;
- }
+ u32 countticks;
+ u32 timeend;
+ u32 timediff;
+ u32 timenow;
+
+ if (usec == 0)
+ return;
+
+ countticks = (u32) (((unsigned long long) TIMER_TICK_HZ * usec) /
+ 1000000);
+
+ /* decrementing timer */
+ timeend = readl(&timer_base->counter) - countticks;
+
+#if TIMER_LOAD_VAL != 0xFFFFFFFF
+ /* do not manage multiple overflow */
+ if (countticks >= TIMER_LOAD_VAL)
+ countticks = TIMER_LOAD_VAL - 1;
+#endif
+
+ do {
+ timenow = readl(&timer_base->counter);
+
+ if (timenow >= timeend) {
+ /* normal case */
+ timediff = timenow - timeend;
+ } else {
+ if ((TIMER_LOAD_VAL - timeend + timenow) <=
+ countticks) {
+ /* overflow */
+ timediff = TIMER_LOAD_VAL - timeend + timenow;
+ } else {
+ /* missed the exact match */
+ break;
+ }
+ }
+ } while (timediff > 0);
}
/* Timer without interrupts */