Patchwork [U-Boot,04/13] arm926ejs: add empty dcache handling functions

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Submitter Ilya Yanok
Date Nov. 11, 2011, 12:39 a.m.
Message ID <1320971988-23525-5-git-send-email-yanok@emcraft.com>
Download mbox | patch
Permalink /patch/125029/
State Superseded
Headers show

Comments

Ilya Yanok - Nov. 11, 2011, 12:39 a.m.
Added no-op {flush,invalidate}_dcache_range functions for the
CONFIG_SYS_DCACHE_OFF case to fix compilation of DaVinci EMAC driver on
arm926.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
---

This should help building DaVinci boards with CONFIG_SYS_DCACHE_OFF
defined. But I can see that most of DaVinci boards using EMAC driver
actually have D-Cache enabled. For these boards build will be still
broken.
Shouldn't we disable D-Cache on these boards? Or does EMAC manage to
work with enabled dcache on these boards somehow?

Regards, Ilya.

 arch/arm/cpu/arm926ejs/Makefile |    2 +-
 arch/arm/cpu/arm926ejs/cache.c  |   49 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletions(-)
 create mode 100644 arch/arm/cpu/arm926ejs/cache.c

Patch

diff --git a/arch/arm/cpu/arm926ejs/Makefile b/arch/arm/cpu/arm926ejs/Makefile
index 930e0d1..5b5f330 100644
--- a/arch/arm/cpu/arm926ejs/Makefile
+++ b/arch/arm/cpu/arm926ejs/Makefile
@@ -26,7 +26,7 @@  include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
-COBJS	= cpu.o
+COBJS	= cpu.o cache.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
diff --git a/arch/arm/cpu/arm926ejs/cache.c b/arch/arm/cpu/arm926ejs/cache.c
new file mode 100644
index 0000000..45443e4
--- /dev/null
+++ b/arch/arm/cpu/arm926ejs/cache.c
@@ -0,0 +1,49 @@ 
+/*
+ * (C) Copyright 2011
+ * Ilya Yanok, EmCraft Systems
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+#include <linux/types.h>
+#include <common.h>
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+
+#warning "Please provide some real implementation for cache operations"
+
+#else /* #ifndef CONFIG_SYS_DCACHE_OFF */
+void invalidate_dcache_all(void)
+{
+}
+
+void flush_dcache_all(void)
+{
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+}
+
+void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+}
+
+void  flush_cache(unsigned long start, unsigned long size)
+{
+}
+#endif /* #ifndef CONFIG_SYS_DCACHE_OFF */