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>

1 files changed, 46 insertions, 41 deletions

diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index b5860535e61f9a..05cb04bc3940b8 100644
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -26,13 +26,6 @@
 #define MAX_DCACHE_PAGES	64	/* XXX: Tune for ways */
 #define MAX_ICACHE_PAGES	32
 
-static void __flush_dcache_segment_1way(unsigned long start,
-					unsigned long extent);
-static void __flush_dcache_segment_2way(unsigned long start,
-					unsigned long extent);
-static void __flush_dcache_segment_4way(unsigned long start,
-					unsigned long extent);
-
 static void __flush_cache_4096(unsigned long addr, unsigned long phys,
 			       unsigned long exec_offset);
 
@@ -45,38 +38,12 @@ static void (*__flush_dcache_segment_fn)(unsigned long, unsigned long) =
 	(void (*)(unsigned long, unsigned long))0xdeadbeef;
 
 /*
- * SH-4 has virtually indexed and physically tagged cache.
- */
-void __init sh4_cache_init(void)
-{
-	printk("PVR=%08x CVR=%08x PRR=%08x\n",
-		ctrl_inl(CCN_PVR),
-		ctrl_inl(CCN_CVR),
-		ctrl_inl(CCN_PRR));
-
-	switch (boot_cpu_data.dcache.ways) {
-	case 1:
-		__flush_dcache_segment_fn = __flush_dcache_segment_1way;
-		break;
-	case 2:
-		__flush_dcache_segment_fn = __flush_dcache_segment_2way;
-		break;
-	case 4:
-		__flush_dcache_segment_fn = __flush_dcache_segment_4way;
-		break;
-	default:
-		panic("unknown number of cache ways\n");
-		break;
-	}
-}
-
-/*
  * Write back the range of D-cache, and purge the I-cache.
  *
  * Called from kernel/module.c:sys_init_module and routine for a.out format,
  * signal handler code and kprobes code
  */
-void flush_icache_range(unsigned long start, unsigned long end)
+static void sh4_flush_icache_range(unsigned long start, unsigned long end)
 {
 	int icacheaddr;
 	unsigned long flags, v;
@@ -137,7 +104,7 @@ static inline void flush_cache_4096(unsigned long start,
  * Write back & invalidate the D-cache of the page.
  * (To avoid "alias" issues)
  */
-void flush_dcache_page(struct page *page)
+static void sh4_flush_dcache_page(struct page *page)
 {
 	struct address_space *mapping = page_mapping(page);
 
@@ -188,7 +155,7 @@ static inline void flush_dcache_all(void)
 	wmb();
 }
 
-void flush_cache_all(void)
+static void sh4_flush_cache_all(void)
 {
 	flush_dcache_all();
 	flush_icache_all();
@@ -280,7 +247,7 @@ loop_exit:
  *
  * Caller takes mm->mmap_sem.
  */
-void flush_cache_mm(struct mm_struct *mm)
+static void sh4_flush_cache_mm(struct mm_struct *mm)
 {
 	if (cpu_context(smp_processor_id(), mm) == NO_CONTEXT)
 		return;
@@ -320,8 +287,8 @@ void flush_cache_mm(struct mm_struct *mm)
  * ADDR: Virtual Address (U0 address)
  * PFN: Physical page number
  */
-void flush_cache_page(struct vm_area_struct *vma, unsigned long address,
-		      unsigned long pfn)
+static void sh4_flush_cache_page(struct vm_area_struct *vma,
+		unsigned long address, unsigned long pfn)
 {
 	unsigned long phys = pfn << PAGE_SHIFT;
 	unsigned int alias_mask;
@@ -368,8 +335,8 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long address,
  * Flushing the cache lines for U0 only isn't enough.
  * We need to flush for P1 too, which may contain aliases.
  */
-void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
-		       unsigned long end)
+static void sh4_flush_cache_range(struct vm_area_struct *vma,
+		unsigned long start, unsigned long end)
 {
 	if (cpu_context(smp_processor_id(), vma->vm_mm) == NO_CONTEXT)
 		return;
@@ -668,3 +635,41 @@ static void __flush_dcache_segment_4way(unsigned long start,
 		a3 += linesz;
 	} while (a0 < a0e);
 }
+
+extern void __weak sh4__flush_region_init(void);
+
+/*
+ * SH-4 has virtually indexed and physically tagged cache.
+ */
+void __init sh4_cache_init(void)
+{
+	printk("PVR=%08x CVR=%08x PRR=%08x\n",
+		ctrl_inl(CCN_PVR),
+		ctrl_inl(CCN_CVR),
+		ctrl_inl(CCN_PRR));
+
+	switch (boot_cpu_data.dcache.ways) {
+	case 1:
+		__flush_dcache_segment_fn = __flush_dcache_segment_1way;
+		break;
+	case 2:
+		__flush_dcache_segment_fn = __flush_dcache_segment_2way;
+		break;
+	case 4:
+		__flush_dcache_segment_fn = __flush_dcache_segment_4way;
+		break;
+	default:
+		panic("unknown number of cache ways\n");
+		break;
+	}
+
+	flush_icache_range	= sh4_flush_icache_range;
+	flush_dcache_page	= sh4_flush_dcache_page;
+	flush_cache_all		= sh4_flush_cache_all;
+	flush_cache_mm		= sh4_flush_cache_mm;
+	flush_cache_dup_mm	= sh4_flush_cache_mm;
+	flush_cache_page	= sh4_flush_cache_page;
+	flush_cache_range	= sh4_flush_cache_range;
+
+	sh4__flush_region_init();
+}