From 7046cddb1b07083d23f9f62592790f2f9174a470 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Thu, 28 Oct 1999 16:01:41 +0000
Subject: Patch rtems-rc-19991011-3.diff from Ralf Corsepius.

---
 c/src/lib/libbsp/sh/gensh1/include/bsp.h       | 33 +++++++++++++++++++++++++-
 c/src/lib/libbsp/sh/gensh1/startup/Makefile.in |  2 +-
 c/src/lib/libcpu/sh/sh7032/clock/Makefile.in   |  2 +-
 c/src/lib/libcpu/sh/sh7032/timer/Makefile.in   |  2 +-
 4 files changed, 35 insertions(+), 4 deletions(-)

(limited to 'c/src/lib')

diff --git a/c/src/lib/libbsp/sh/gensh1/include/bsp.h b/c/src/lib/libbsp/sh/gensh1/include/bsp.h
index 8f676d07fe..8422599b42 100644
--- a/c/src/lib/libbsp/sh/gensh1/include/bsp.h
+++ b/c/src/lib/libbsp/sh/gensh1/include/bsp.h
@@ -68,8 +68,39 @@ extern "C" {
 #define Lower_tm27_intr()
 
 /* Constants */
+#ifndef MHZ
+#error Missing MHZ
+#endif
+
+/*
+ *  Simple spin delay in microsecond units for device drivers.
+ *  This is very dependent on the clock speed of the target.
+ *
+ *  Since we don't have a real time clock, this is a very rough
+ *  approximation, assuming that each cycle of the delay loop takes
+ *  approx. 4 machine cycles.
+ *
+ *  e.g.: MHZ = 20 =>     5e-8 secs per instruction
+ *                 => 4 * 5e-8 secs per delay loop
+ */
+
+#define delay( microseconds ) \
+{ register unsigned int _delay = (microseconds) * (MHZ / 4 ); \
+  asm volatile ( \
+"0:	add  #-1,%0\n \
+	nop\n \
+	cmp/pl %0\n \
+	bt 0b\
+	nop" \
+    :: "r" (_delay) );  \
+}
 
-#define MHZ 20
+/*
+ * For backward compatibility only.
+ * Do not rely on them being present in future
+ */
+#define CPU_delay( microseconds ) delay( microseconds )
+#define sh_deley( microseconds ) delay( microseconds )
 
 /*
  * Defined in the linker script 'linkcmds'
diff --git a/c/src/lib/libbsp/sh/gensh1/startup/Makefile.in b/c/src/lib/libbsp/sh/gensh1/startup/Makefile.in
index c2eca457b9..3d03489ca3 100644
--- a/c/src/lib/libbsp/sh/gensh1/startup/Makefile.in
+++ b/c/src/lib/libbsp/sh/gensh1/startup/Makefile.in
@@ -47,7 +47,7 @@ $(INSTALLDIRS):
 #
 
 DEFINES +=
-CPPFLAGS +=
+CPPFLAGS += $(BSP_CPPFLAGS)
 CFLAGS +=
 
 LD_PATHS +=
diff --git a/c/src/lib/libcpu/sh/sh7032/clock/Makefile.in b/c/src/lib/libcpu/sh/sh7032/clock/Makefile.in
index 5617ae594e..c9bd2ac92d 100644
--- a/c/src/lib/libcpu/sh/sh7032/clock/Makefile.in
+++ b/c/src/lib/libcpu/sh/sh7032/clock/Makefile.in
@@ -40,7 +40,7 @@ INSTALL_CHANGE = @INSTALL_CHANGE@
 #
 
 DEFINES +=
-CPPFLAGS +=
+CPPFLAGS += -DMHZ=$(MHZ)
 CFLAGS += $(CFLAGS_OS_V)
 
 LD_PATHS +=
diff --git a/c/src/lib/libcpu/sh/sh7032/timer/Makefile.in b/c/src/lib/libcpu/sh/sh7032/timer/Makefile.in
index ce19bbb25c..735ef3961d 100644
--- a/c/src/lib/libcpu/sh/sh7032/timer/Makefile.in
+++ b/c/src/lib/libcpu/sh/sh7032/timer/Makefile.in
@@ -40,7 +40,7 @@ INSTALL_CHANGE = @INSTALL_CHANGE@
 #
 
 DEFINES +=
-CPPFLAGS +=
+CPPFLAGS += -DMHZ=$(MHZ)
 CFLAGS +=
 
 LD_PATHS +=
-- 
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