sh: Migrate SH-4 cacheflush ops to function pointers.

This paves the way for allowing individual CPUs to overload the
individual flushing routines that they care about without having to
depend on weak aliases. SH-4 is converted over initially, as it wires
up pretty much everything. The majority of the other CPUs will simply use
the default no-op implementation with their own region flushers wired up.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

4 files changed, 26 insertions, 89 deletions

diff --git a/arch/sh/include/asm/cacheflush.h b/arch/sh/include/asm/cacheflush.h
index b1cf30f423af..25b7f46494de 100644
--- a/arch/sh/include/asm/cacheflush.h
+++ b/arch/sh/include/asm/cacheflush.h
@@ -1,46 +1,11 @@
 #ifndef __ASM_SH_CACHEFLUSH_H
 #define __ASM_SH_CACHEFLUSH_H
 
-#include <linux/mm.h>
-
 #ifdef __KERNEL__
 
-#ifdef CONFIG_CACHE_OFF
-/*
- * Nothing to do when the cache is disabled, initial flush and explicit
- * disabling is handled at CPU init time.
- *
- * See arch/sh/kernel/cpu/init.c:cache_init().
- */
-#define flush_cache_all()                       do { } while (0)
-#define flush_cache_mm(mm)                      do { } while (0)
-#define flush_cache_dup_mm(mm)                  do { } while (0)
-#define flush_cache_range(vma, start, end)      do { } while (0)
-#define flush_cache_page(vma, vmaddr, pfn)      do { } while (0)
-#define flush_dcache_page(page)                 do { } while (0)
-#define flush_icache_range(start, end)          do { } while (0)
-#define flush_icache_page(vma,pg)               do { } while (0)
-#define flush_cache_sigtramp(vaddr)             do { } while (0)
-#define __flush_wback_region(start, size)       do { (void)(start); } while (0)
-#define __flush_purge_region(start, size)       do { (void)(start); } while (0)
-#define __flush_invalidate_region(start, size)  do { (void)(start); } while (0)
-#else
+#include <linux/mm.h>
 #include <cpu/cacheflush.h>
 
-/*
- * Consistent DMA requires that the __flush_xxx() primitives must be set
- * for any of the enabled non-coherent caches (most of the UP CPUs),
- * regardless of PIPT or VIPT cache configurations.
- */
-
-/* Flush (write-back only) a region (smaller than a page) */
-extern void __flush_wback_region(void *start, int size);
-/* Flush (write-back & invalidate) a region (smaller than a page) */
-extern void __flush_purge_region(void *start, int size);
-/* Flush (invalidate only) a region (smaller than a page) */
-extern void __flush_invalidate_region(void *start, int size);
-#endif
-
 #define ARCH_HAS_FLUSH_ANON_PAGE
 extern void __flush_anon_page(struct page *page, unsigned long);
 
diff --git a/arch/sh/include/cpu-common/cpu/cacheflush.h b/arch/sh/include/cpu-common/cpu/cacheflush.h
index 5dc3736218e7..8189dbd68f8f 100644
--- a/arch/sh/include/cpu-common/cpu/cacheflush.h
+++ b/arch/sh/include/cpu-common/cpu/cacheflush.h
@@ -1,14 +1,12 @@
 /*
- * include/asm-sh/cpu-sh2/cacheflush.h
- *
  * Copyright (C) 2003 Paul Mundt
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
-#ifndef __ASM_CPU_SH2_CACHEFLUSH_H
-#define __ASM_CPU_SH2_CACHEFLUSH_H
+#ifndef __ASM_CPU_SH_CACHEFLUSH_H
+#define __ASM_CPU_SH_CACHEFLUSH_H
 
 /*
  * Cache flushing:
@@ -22,18 +20,23 @@
  *  - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
  *  - flush_icache_range(start, end) flushes(invalidates) a range for icache
  *  - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
- *
- *  Caches are indexed (effectively) by physical address on SH-2, so
- *  we don't need them.
+ *  - flush_cache_sigtramp(vaddr) flushes the signal trampoline
  */
-#define flush_cache_all()                       do { } while (0)
-#define flush_cache_mm(mm)                      do { } while (0)
-#define flush_cache_dup_mm(mm)                  do { } while (0)
-#define flush_cache_range(vma, start, end)      do { } while (0)
-#define flush_cache_page(vma, vmaddr, pfn)      do { } while (0)
-#define flush_dcache_page(page)                 do { } while (0)
-#define flush_icache_range(start, end)          do { } while (0)
-#define flush_icache_page(vma,pg)               do { } while (0)
-#define flush_cache_sigtramp(vaddr)             do { } while (0)
+extern void (*flush_cache_all)(void);
+extern void (*flush_cache_mm)(struct mm_struct *mm);
+extern void (*flush_cache_dup_mm)(struct mm_struct *mm);
+extern void (*flush_cache_page)(struct vm_area_struct *vma,
+                                unsigned long addr, unsigned long pfn);
+extern void (*flush_cache_range)(struct vm_area_struct *vma,
+                                 unsigned long start, unsigned long end);
+extern void (*flush_dcache_page)(struct page *page);
+extern void (*flush_icache_range)(unsigned long start, unsigned long end);
+extern void (*flush_icache_page)(struct vm_area_struct *vma,
+                                 struct page *page);
+extern void (*flush_cache_sigtramp)(unsigned long address);
+
+extern void (*__flush_wback_region)(void *start, int size);
+extern void (*__flush_purge_region)(void *start, int size);
+extern void (*__flush_invalidate_region)(void *start, int size);
 
-#endif /* __ASM_CPU_SH2_CACHEFLUSH_H */
+#endif /* __ASM_CPU_SH_CACHEFLUSH_H */
diff --git a/arch/sh/include/cpu-sh4/cpu/cacheflush.h b/arch/sh/include/cpu-sh4/cpu/cacheflush.h
deleted file mode 100644
index d6bd396d7dfb..000000000000
--- a/arch/sh/include/cpu-sh4/cpu/cacheflush.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * include/asm-sh/cpu-sh4/cacheflush.h
- *
- * Copyright (C) 1999 Niibe Yutaka
- * Copyright (C) 2003 Paul Mundt
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#ifndef __ASM_CPU_SH4_CACHEFLUSH_H
-#define __ASM_CPU_SH4_CACHEFLUSH_H
-
-/*
- *  Caches are broken on SH-4 (unless we use write-through
- *  caching; in which case they're only semi-broken),
- *  so we need them.
- */
-void flush_cache_all(void);
-void flush_cache_mm(struct mm_struct *mm);
-#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
-void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
-                       unsigned long end);
-void flush_cache_page(struct vm_area_struct *vma, unsigned long addr,
-                      unsigned long pfn);
-void flush_dcache_page(struct page *pg);
-void flush_icache_range(unsigned long start, unsigned long end);
-
-#define flush_icache_page(vma,pg)               do { } while (0)
-
-#endif /* __ASM_CPU_SH4_CACHEFLUSH_H */
diff --git a/arch/sh/include/cpu-sh5/cpu/cacheflush.h b/arch/sh/include/cpu-sh5/cpu/cacheflush.h
index 740d10a316ef..202f637a0e17 100644
--- a/arch/sh/include/cpu-sh5/cpu/cacheflush.h
+++ b/arch/sh/include/cpu-sh5/cpu/cacheflush.h
@@ -3,10 +3,6 @@
 
 #ifndef __ASSEMBLY__
 
-struct vm_area_struct;
-struct page;
-struct mm_struct;
-
 extern void flush_cache_all(void);
 extern void flush_cache_mm(struct mm_struct *mm);
 extern void flush_cache_sigtramp(unsigned long vaddr);
@@ -16,10 +12,14 @@ extern void flush_cache_page(struct vm_area_struct *vma, unsigned long addr, uns
 extern void flush_dcache_page(struct page *pg);
 extern void flush_icache_range(unsigned long start, unsigned long end);
 
+/* XXX .. */
+extern void (*__flush_wback_region)(void *start, int size);
+extern void (*__flush_purge_region)(void *start, int size);
+extern void (*__flush_invalidate_region)(void *start, int size);
+
 #define flush_cache_dup_mm(mm)  flush_cache_mm(mm)
 #define flush_icache_page(vma, page)    do { } while (0)
 
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ASM_SH_CPU_SH5_CACHEFLUSH_H */
-