nios2: fix cache coherency

There is intermittent cache coherency issue caught in toolchian tests.
Revert to use flushd.

Signed-off-by: Ley Foon Tan <lftan@altera.com>

diff --git a/arch/nios2/mm/cacheflush.c b/arch/nios2/mm/cacheflush.c
index 223cdcc8203f566483c15051c1ce5cfdfe608791..87bf88ed04c6c0a13220e2b3588b7fedbb6145f3 100644 (file)
--- a/arch/nios2/mm/cacheflush.c
+++ b/arch/nios2/mm/cacheflush.c
@@ -23,22 +23,6 @@ static void __flush_dcache(unsigned long start, unsigned long end)
        end += (cpuinfo.dcache_line_size - 1);
        end &= ~(cpuinfo.dcache_line_size - 1);
 
-       for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
-               __asm__ __volatile__ ("   flushda 0(%0)\n"
-                                       : /* Outputs */
-                                       : /* Inputs  */ "r"(addr)
-                                       /* : No clobber */);
-       }
-}
-
-static void __flush_dcache_all(unsigned long start, unsigned long end)
-{
-       unsigned long addr;
-
-       start &= ~(cpuinfo.dcache_line_size - 1);
-       end += (cpuinfo.dcache_line_size - 1);
-       end &= ~(cpuinfo.dcache_line_size - 1);
-
        if (end > start + cpuinfo.dcache_size)
                end = start + cpuinfo.dcache_size;
 
@@ -112,7 +96,7 @@ static void flush_aliases(struct address_space *mapping, struct page *page)
 
 void flush_cache_all(void)
 {
-       __flush_dcache_all(0, cpuinfo.dcache_size);
+       __flush_dcache(0, cpuinfo.dcache_size);
        __flush_icache(0, cpuinfo.icache_size);
 }
 
@@ -182,7 +166,7 @@ void __flush_dcache_page(struct address_space *mapping, struct page *page)
         */
        unsigned long start = (unsigned long)page_address(page);
 
-       __flush_dcache_all(start, start + PAGE_SIZE);
+       __flush_dcache(start, start + PAGE_SIZE);
 }
 
 void flush_dcache_page(struct page *page)
@@ -268,7 +252,7 @@ void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
 {
        flush_cache_page(vma, user_vaddr, page_to_pfn(page));
        memcpy(dst, src, len);
-       __flush_dcache_all((unsigned long)src, (unsigned long)src + len);
+       __flush_dcache((unsigned long)src, (unsigned long)src + len);
        if (vma->vm_flags & VM_EXEC)
                __flush_icache((unsigned long)src, (unsigned long)src + len);
 }
@@ -279,7 +263,7 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 {
        flush_cache_page(vma, user_vaddr, page_to_pfn(page));
        memcpy(dst, src, len);
-       __flush_dcache_all((unsigned long)dst, (unsigned long)dst + len);
+       __flush_dcache((unsigned long)dst, (unsigned long)dst + len);
        if (vma->vm_flags & VM_EXEC)
                __flush_icache((unsigned long)dst, (unsigned long)dst + len);
 }