From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 arch/sh/mm/consistent.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 arch/sh/mm/consistent.c

(limited to 'arch/sh/mm/consistent.c')

diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
new file mode 100644
index 000000000000..1f7af0c73cf4
--- /dev/null
+++ b/arch/sh/mm/consistent.c
@@ -0,0 +1,85 @@
+/*
+ * arch/sh/mm/consistent.c
+ *
+ * Copyright (C) 2004  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.
+ */
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <asm/io.h>
+
+void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle)
+{
+	struct page *page, *end, *free;
+	void *ret;
+	int order;
+
+	size = PAGE_ALIGN(size);
+	order = get_order(size);
+
+	page = alloc_pages(gfp, order);
+	if (!page)
+		return NULL;
+
+	ret = page_address(page);
+	*handle = virt_to_phys(ret);
+
+	/*
+	 * We must flush the cache before we pass it on to the device
+	 */
+	dma_cache_wback_inv(ret, size);
+
+	page = virt_to_page(ret);
+	free = page + (size >> PAGE_SHIFT);
+	end  = page + (1 << order);
+
+	while (++page < end) {
+		set_page_count(page, 1);
+
+		/* Free any unused pages */
+		if (page >= free) {
+			__free_page(page);
+		}
+	}
+
+	return P2SEGADDR(ret);
+}
+
+void consistent_free(void *vaddr, size_t size)
+{
+	unsigned long addr = P1SEGADDR((unsigned long)vaddr);
+	struct page *page=virt_to_page(addr);
+	int num_pages=(size+PAGE_SIZE-1) >> PAGE_SHIFT;
+	int i;
+
+	for(i=0;i<num_pages;i++) {
+		__free_page((page+i));
+	}
+}
+
+void consistent_sync(void *vaddr, size_t size, int direction)
+{
+	void * p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
+
+	switch (direction) {
+	case DMA_FROM_DEVICE:		/* invalidate only */
+		dma_cache_inv(p1addr, size);
+		break;
+	case DMA_TO_DEVICE:		/* writeback only */
+		dma_cache_wback(p1addr, size);
+		break;
+	case DMA_BIDIRECTIONAL:		/* writeback and invalidate */
+		dma_cache_wback_inv(p1addr, size);
+		break;
+	default:
+		BUG();
+	}
+}
+
+EXPORT_SYMBOL(consistent_alloc);
+EXPORT_SYMBOL(consistent_free);
+EXPORT_SYMBOL(consistent_sync);
+
-- 
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