m68knommu: Use symbolic constants for cache operations on M54xx

Now that we have meaningfull symbolic constants for bit definitions
of the cache registers of m5407 and m548x chips, use them to
improve readability, portability and efficiency of the cache operations.

This also fixes __flush_cache_all for m548x chips : implicit
DCACHE_SIZE was exact for m5407, but wrong for m548x.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

3 files changed, 65 insertions, 17 deletions

diff --git a/arch/m68k/include/asm/cacheflush_no.h b/arch/m68k/include/asm/cacheflush_no.h
index 8fda331f8a8..29f76204ce1 100644
--- a/arch/m68k/include/asm/cacheflush_no.h
+++ b/arch/m68k/include/asm/cacheflush_no.h
@@ -14,7 +14,9 @@
 #define flush_cache_dup_mm(mm)                  do { } while (0)
 #define flush_cache_range(vma, start, end)      __flush_cache_all()
 #define flush_cache_page(vma, vmaddr)           do { } while (0)
+#ifndef flush_dcache_range
 #define flush_dcache_range(start,len)           __flush_cache_all()
+#endif
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
 #define flush_dcache_page(page)                 do { } while (0)
 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
diff --git a/arch/m68k/include/asm/m54xxacr.h b/arch/m68k/include/asm/m54xxacr.h
index da713d22dd0..7d28da4d622 100644
--- a/arch/m68k/include/asm/m54xxacr.h
+++ b/arch/m68k/include/asm/m54xxacr.h
@@ -40,31 +40,75 @@
 #define ACR_CM          0x00000060      /* Cache mode mask */
 #define ACR_WPROTECT    0x00000004      /* Write protect */
 
+#if defined(CONFIG_M5407)
+
+#define ICACHE_SIZE 0x4000      /* instruction - 16k */
+#define DCACHE_SIZE 0x2000      /* data - 8k */
+
+#elif defined(CONFIG_M548x)
+
+#define ICACHE_SIZE 0x8000      /* instruction - 32k */
+#define DCACHE_SIZE 0x8000      /* data - 32k */
+
+#endif
+
+#define CACHE_LINE_SIZE 0x0010  /* 16 bytes */
+#define CACHE_WAYS 4            /* 4 ways */
+
+/*
+ *      Version 4 cores have a true harvard style separate instruction
+ *      and data cache. Enable data and instruction caches, also enable write
+ *      buffers and branch accelerator.
+ */
+/* attention : enabling CACR_DESB requires a "nop" to flush the store buffer */
+/* use '+' instead of '|' for assembler's sake */
+
+        /* Enable data cache */
+        /* Enable data store buffer */
+        /* outside ACRs : No cache, precise */
+        /* Enable instruction+branch caches */
+#define CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC)
+
+#define DATA_CACHE_MODE (ACR_ENABLE+ACR_ANY+ACR_CM_WT)
+
+#define INSN_CACHE_MODE (ACR_ENABLE+ACR_ANY)
+
 #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.
          */
-        __asm__ __volatile__ (
-                "nop\n\t"
                 "clrl   %%d0\n\t"
                 "1:\n\t"
                 "movel  %%d0,%%a0\n\t"
                 "2:\n\t"
                 ".word  0xf468\n\t"
-                "addl   #0x10,%%a0\n\t"
-                "cmpl   #0x00000800,%%a0\n\t"
+                "addl   %0,%%a0\n\t"
+                "cmpl   %1,%%a0\n\t"
                 "blt    2b\n\t"
                 "addql  #1,%%d0\n\t"
-                "cmpil  #4,%%d0\n\t"
+                "cmpil  %2,%%d0\n\t"
                 "bne    1b\n\t"
-                "movel  #0xb6088500,%%d0\n\t"
+#endif
+                "movel  %3,%%d0\n\t"
                 "movec  %%d0,%%CACR\n\t"
-                : : : "d0", "a0" );
+                "nop\n\t"       /* forces flush of Store Buffer */
+                : /* No output */
+                : "i" (CACHE_LINE_SIZE),
+                  "i" (DCACHE_SIZE / CACHE_WAYS),
+                  "i" (CACHE_WAYS),
+                  "i" (CACHE_MODE|CACR_DCINVA|CACR_BCINVA|CACR_ICINVA)
+                : "d0", "a0" );
 }
 
 #define __flush_cache_all() __m54xx_flush_cache_all()
diff --git a/arch/m68k/include/asm/mcfcache.h b/arch/m68k/include/asm/mcfcache.h
index f49dfc09f70..7acb406d601 100644
--- a/arch/m68k/include/asm/mcfcache.h
+++ b/arch/m68k/include/asm/mcfcache.h
@@ -108,28 +108,30 @@
 #endif /* CONFIG_M532x */
 
 #if defined(CONFIG_M5407) || defined(CONFIG_M548x)
-/*
- *      Version 4 cores have a true harvard style separate instruction
- *      and data cache. Invalidate and enable cache, also enable write
- *      buffers and branch accelerator.
- */
+
+#include <asm/m54xxacr.h>
+
 .macro CACHE_ENABLE
-        movel   #0x01040100,%d0         /* invalidate whole cache */
+        /* invalidate whole cache */
+        movel   #(CACR_DCINVA+CACR_BCINVA+CACR_ICINVA),%d0
         movec   %d0,%CACR
         nop
-        movel   #0x000fc000,%d0         /* set SDRAM cached only */
+        /* addresses range for data cache : 0x00000000-0x0fffffff */
+        movel   #(0x000f0000+DATA_CACHE_MODE),%d0       /* set SDRAM cached */
         movec   %d0, %ACR0
         movel   #0x00000000,%d0         /* no other regions cached */
         movec   %d0, %ACR1
-        movel   #0x000fc000,%d0         /* set SDRAM cached only */
+        /* addresses range for instruction cache : 0x00000000-0x0fffffff */
+        movel   #(0x000f0000+INSN_CACHE_MODE),%d0       /* set SDRAM cached */
         movec   %d0, %ACR2
         movel   #0x00000000,%d0         /* no other regions cached */
         movec   %d0, %ACR3
-        movel   #0xb6088400,%d0         /* enable caches */
+        /* enable caches */
+        movel   #(CACHE_MODE),%d0
         movec   %d0,%CACR
         nop
 .endm
-#endif /* CONFIG_M5407 */
+#endif /* CONFIG_M5407 || CONFIG_M548x */
 
 #if defined(CONFIG_M520x)
 .macro CACHE_ENABLE