[U-Boot] [RFC][PATCH 16/21] [sc520] Allow boards to override udelay

Graeme Russ
2010-03-25T11:22:58Z

If the board has a high precision mico-second timer, it maked sense to use
it instead of the on-chip one
---
cpu/i386/sc520/sc520_timer.c | 4 ++++
include/asm-i386/ic/sc520.h | 1 +
2 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/cpu/i386/sc520/sc520_timer.c b/cpu/i386/sc520/sc520_timer.c
index eca48e0..d5617e9 100644
--- a/cpu/i386/sc520/sc520_timer.c
+++ b/cpu/i386/sc520/sc520_timer.c
@@ -69,7 +69,11 @@ int timer_init(void)
return 0;
}

+/* Allow boards to override udelay implementation */
void __udelay(unsigned long usec)
+ __attribute__((weak, alias("sc520_udelay")));
+
+void sc520_udelay(unsigned long usec)
{
int m = 0;
long u;
diff --git a/include/asm-i386/ic/sc520.h b/include/asm-i386/ic/sc520.h
index 57c9904..20384a4 100644
--- a/include/asm-i386/ic/sc520.h
+++ b/include/asm-i386/ic/sc520.h
@@ -28,6 +28,7 @@

void init_sc520(void);
unsigned long init_sc520_dram(void);
+void sc520_udelay(unsigned long usec);

/* Memory mapped configuration registers */
typedef struct sc520_mmcr {
--
1.7.0.2.182.ge007