m68k: cache: add an empty stub functions for invalidate/flush dcache

Since some driver like ohci, lcd used dcache functions. But m68k don't implement the invalidate_dcache_range()/flush_dcache_range() functions. To avoid compiling errors this patch adds an weak empty stub function for all m68k cpu. Also each cpu can implement its own implementation. If not implemented then by default is using an empty function. Signed-off-by: Josh Wu <josh.wu@atmel.com> Acked-by: Angelo Dureghello <angelo@sysam.it>

m68k: cache: add an empty stub functions for invalidate/flush dcache
Since some driver like ohci, lcd used dcache functions. But m68k don't implement the invalidate_dcache_range()/flush_dcache_range() functions. To avoid compiling errors this patch adds an weak empty stub function for all m68k cpu. Also each cpu can implement its own implementation. If not implemented then by default is using an empty function. Signed-off-by: Josh Wu <josh.wu@atmel.com> Acked-by: Angelo Dureghello <angelo@sysam.it>
Wu, Josh · Tom Rini
1 parent 057c220055
Showing 1 changed file with 9 additions and 0 deletions Side-by-side Diff
arch/m68k/lib/cache.c
@@ -132,4 +132,13 @@
 	__asm__ __volatile__("movec %0, %%cacr"::"r"(temp));
 #endif
 }
+
+__weak void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+	/* An empty stub, real implementation should be in platform code */
+}
+__weak void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+	/* An empty stub, real implementation should be in platform code */
+}
...	...	@@ -132,4 +132,13 @@
132	132	__asm__ __volatile__("movec %0, %%cacr"::"r"(temp));
133	133	#endif
134	134	}
	135	+
	136	+__weak void invalidate_dcache_range(unsigned long start, unsigned long stop)
	137	+{
	138	+ /* An empty stub, real implementation should be in platform code */
	139	+}
	140	+__weak void flush_dcache_range(unsigned long start, unsigned long stop)
	141	+{
	142	+ /* An empty stub, real implementation should be in platform code */
	143	+}