m68knommu: make cache push code ColdFire generic

Currently the code to push cache lines is only available to version 4
cores. Version 3 cores may also need to use this if we support copy-
back caches on them. Move this code to make it more generic, and
useful for all version ColdFire cores.

With this in place we can now have a single cache_flush_all() code
path that does all the right things on all version cores.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

4 files changed, 56 insertions, 39 deletions

diff --git a/arch/m68k/include/asm/cacheflush_no.h b/arch/m68k/include/asm/cacheflush_no.h
index 8ada4ffc98e..f931e182983 100644
--- a/arch/m68k/include/asm/cacheflush_no.h
+++ b/arch/m68k/include/asm/cacheflush_no.h
@@ -30,9 +30,13 @@
 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
         memcpy(dst, src, len)
 
-#ifndef __flush_cache_all
+void mcf_cache_push(void);
+
 static inline void __flush_cache_all(void)
 {
+#ifdef CACHE_PUSH
+        mcf_cache_push();
+#endif
 #ifdef CACHE_INVALIDATE
         __asm__ __volatile__ (
                 "movel  %0, %%d0\n\t"
@@ -41,6 +45,5 @@ static inline void __flush_cache_all(void)
                 : : "i" (CACHE_INVALIDATE) : "d0" );
 #endif
 }
-#endif /* __flush_cache_all */
 
 #endif /* _M68KNOMMU_CACHEFLUSH_H */
diff --git a/arch/m68k/include/asm/m54xxacr.h b/arch/m68k/include/asm/m54xxacr.h
index 3c81a7a34a8..6bce82fdb9c 100644
--- a/arch/m68k/include/asm/m54xxacr.h
+++ b/arch/m68k/include/asm/m54xxacr.h
@@ -83,46 +83,12 @@
 #define ACR2_MODE       (0x000f0000+INSN_CACHE_MODE)
 #define ACR3_MODE       0
 
-#ifndef __ASSEMBLY__
-
 #if ((DATA_CACHE_MODE & ACR_CM) == ACR_CM_WT)
 #define flush_dcache_range(a, l) do { asm("nop"); } while (0)
 #endif
-
-static inline void __m54xx_flush_cache_all(void)
-{
-        __asm__ __volatile__ (
 #if ((DATA_CACHE_MODE & ACR_CM) == ACR_CM_CP)
-        /*
-         *      Use cpushl to push and invalidate all cache lines.
-         *      Gas doesn't seem to know how to generate the ColdFire
-         *      cpushl instruction... Oh well, bit stuff it for now.
-         */
-                "clrl   %%d0\n\t"
-                "1:\n\t"
-                "movel  %%d0,%%a0\n\t"
-                "2:\n\t"
-                ".word  0xf468\n\t"
-                "addl   %0,%%a0\n\t"
-                "cmpl   %1,%%a0\n\t"
-                "blt    2b\n\t"
-                "addql  #1,%%d0\n\t"
-                "cmpil  %2,%%d0\n\t"
-                "bne    1b\n\t"
+/* Copyback cache mode must push dirty cache lines first */
+#define CACHE_PUSH
 #endif
-                "movel  %3,%%d0\n\t"
-                "movec  %%d0,%%CACR\n\t"
-                "nop\n\t"       /* forces flush of Store Buffer */
-                : /* No output */
-                : "i" (CACHE_LINE_SIZE),
-                  "i" (DCACHE_SIZE / CACHE_WAYS),
-                  "i" (CACHE_WAYS),
-                  "i" (CACHE_INVALIDATE)
-                : "d0", "a0" );
-}
-
-#define __flush_cache_all() __m54xx_flush_cache_all()
-
-#endif /* __ASSEMBLY__ */
 
 #endif  /* m54xxacr_h */
diff --git a/arch/m68knommu/platform/coldfire/Makefile b/arch/m68knommu/platform/coldfire/Makefile
index 53a27e1a790..a8967baabd7 100644
--- a/arch/m68knommu/platform/coldfire/Makefile
+++ b/arch/m68knommu/platform/coldfire/Makefile
@@ -14,7 +14,7 @@
 
 asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1
 
-obj-$(CONFIG_COLDFIRE)  += clk.o dma.o entry.o vectors.o
+obj-$(CONFIG_COLDFIRE)  += cache.o clk.o dma.o entry.o vectors.o
 obj-$(CONFIG_M5206)     += timers.o intc.o
 obj-$(CONFIG_M5206e)    += timers.o intc.o
 obj-$(CONFIG_M520x)     += pit.o intc-simr.o
diff --git a/arch/m68knommu/platform/coldfire/cache.c b/arch/m68knommu/platform/coldfire/cache.c
new file mode 100644
index 00000000000..235d3c4f4f0
--- /dev/null
+++ b/arch/m68knommu/platform/coldfire/cache.c
@@ -0,0 +1,48 @@
+/***************************************************************************/
+
+/*
+ *      cache.c -- general ColdFire Cache maintainence code
+ *
+ *      Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
+ */
+
+/***************************************************************************/
+
+#include <linux/kernel.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+
+/***************************************************************************/
+#ifdef CACHE_PUSH
+/***************************************************************************/
+
+/*
+ *      Use cpushl to push all dirty cache lines back to memory.
+ *      Older versions of GAS don't seem to know how to generate the
+ *      ColdFire cpushl instruction... Oh well, bit stuff it for now.
+ */
+
+void mcf_cache_push(void)
+{
+        __asm__ __volatile__ (
+                "clrl   %%d0\n\t"
+                "1:\n\t"
+                "movel  %%d0,%%a0\n\t"
+                "2:\n\t"
+                ".word  0xf468\n\t"
+                "addl   %0,%%a0\n\t"
+                "cmpl   %1,%%a0\n\t"
+                "blt    2b\n\t"
+                "addql  #1,%%d0\n\t"
+                "cmpil  %2,%%d0\n\t"
+                "bne    1b\n\t"
+                : /* No output */
+                : "i" (CACHE_LINE_SIZE),
+                  "i" (DCACHE_SIZE / CACHE_WAYS),
+                  "i" (CACHE_WAYS)
+                : "d0", "a0" );
+}
+
+/***************************************************************************/
+#endif /* CACHE_PUSH */
+/***************************************************************************/