summaryrefslogtreecommitdiffstats
path: root/arch/microblaze/include/asm/cacheflush.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/microblaze/include/asm/cacheflush.h')
-rw-r--r--arch/microblaze/include/asm/cacheflush.h95
1 files changed, 95 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/cacheflush.h b/arch/microblaze/include/asm/cacheflush.h
new file mode 100644
index 000000000..39f8fb676
--- /dev/null
+++ b/arch/microblaze/include/asm/cacheflush.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2007-2009 PetaLogix
+ * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
+ * based on v850 version which was
+ * Copyright (C) 2001,02,03 NEC Electronics Corporation
+ * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
+ */
+
+#ifndef _ASM_MICROBLAZE_CACHEFLUSH_H
+#define _ASM_MICROBLAZE_CACHEFLUSH_H
+
+/* Somebody depends on this; sigh... */
+#include <linux/mm.h>
+#include <linux/io.h>
+
+/* Look at Documentation/core-api/cachetlb.rst */
+
+/*
+ * Cache handling functions.
+ * Microblaze has a write-through data cache, meaning that the data cache
+ * never needs to be flushed. The only flushing operations that are
+ * implemented are to invalidate the instruction cache. These are called
+ * after loading a user application into memory, we must invalidate the
+ * instruction cache to make sure we don't fetch old, bad code.
+ */
+
+/* struct cache, d=dcache, i=icache, fl = flush, iv = invalidate,
+ * suffix r = range */
+struct scache {
+ /* icache */
+ void (*ie)(void); /* enable */
+ void (*id)(void); /* disable */
+ void (*ifl)(void); /* flush */
+ void (*iflr)(unsigned long a, unsigned long b);
+ void (*iin)(void); /* invalidate */
+ void (*iinr)(unsigned long a, unsigned long b);
+ /* dcache */
+ void (*de)(void); /* enable */
+ void (*dd)(void); /* disable */
+ void (*dfl)(void); /* flush */
+ void (*dflr)(unsigned long a, unsigned long b);
+ void (*din)(void); /* invalidate */
+ void (*dinr)(unsigned long a, unsigned long b);
+};
+
+/* microblaze cache */
+extern struct scache *mbc;
+
+void microblaze_cache_init(void);
+
+#define enable_icache() mbc->ie();
+#define disable_icache() mbc->id();
+#define flush_icache() mbc->ifl();
+#define flush_icache_range(start, end) mbc->iflr(start, end);
+#define invalidate_icache() mbc->iin();
+#define invalidate_icache_range(start, end) mbc->iinr(start, end);
+
+#define enable_dcache() mbc->de();
+#define disable_dcache() mbc->dd();
+/* FIXME for LL-temac driver */
+#define invalidate_dcache() mbc->din();
+#define invalidate_dcache_range(start, end) mbc->dinr(start, end);
+#define flush_dcache() mbc->dfl();
+#define flush_dcache_range(start, end) mbc->dflr(start, end);
+
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
+/* MS: We have to implement it because of rootfs-jffs2 issue on WB */
+#define flush_dcache_page(page) \
+do { \
+ unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
+ addr = (u32)virt_to_phys((void *)addr); \
+ flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
+} while (0);
+
+#define flush_cache_page(vma, vmaddr, pfn) \
+ flush_dcache_range(pfn << PAGE_SHIFT, (pfn << PAGE_SHIFT) + PAGE_SIZE);
+
+static inline void copy_to_user_page(struct vm_area_struct *vma,
+ struct page *page, unsigned long vaddr,
+ void *dst, void *src, int len)
+{
+ u32 addr = virt_to_phys(dst);
+ memcpy(dst, src, len);
+ if (vma->vm_flags & VM_EXEC) {
+ invalidate_icache_range(addr, addr + PAGE_SIZE);
+ flush_dcache_range(addr, addr + PAGE_SIZE);
+ }
+}
+#define copy_to_user_page copy_to_user_page
+
+#include <asm-generic/cacheflush.h>
+
+#endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */