1 files changed, 159 insertions, 0 deletions

diff --git a/kernel/arch/sh/mm/consistent.c b/kernel/arch/sh/mm/consistent.c
new file mode 100644
index 000000000..b81d9dbf9
--- /dev/null
+++ b/kernel/arch/sh/mm/consistent.c
@@ -0,0 +1,159 @@
+/*
+ * arch/sh/mm/consistent.c
+ *
+ * Copyright (C) 2004 - 2007  Paul Mundt
+ *
+ * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c
+ *
+ * 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/init.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-debug.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <asm/cacheflush.h>
+#include <asm/addrspace.h>
+
+#define PREALLOC_DMA_DEBUG_ENTRIES	4096
+
+struct dma_map_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
+
+static int __init dma_init(void)
+{
+	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+	return 0;
+}
+fs_initcall(dma_init);
+
+void *dma_generic_alloc_coherent(struct device *dev, size_t size,
+				 dma_addr_t *dma_handle, gfp_t gfp,
+				 struct dma_attrs *attrs)
+{
+	void *ret, *ret_nocache;
+	int order = get_order(size);
+
+	gfp |= __GFP_ZERO;
+
+	ret = (void *)__get_free_pages(gfp, order);
+	if (!ret)
+		return NULL;
+
+	/*
+	 * Pages from the page allocator may have data present in
+	 * cache. So flush the cache before using uncached memory.
+	 */
+	dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
+
+	ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
+	if (!ret_nocache) {
+		free_pages((unsigned long)ret, order);
+		return NULL;
+	}
+
+	split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
+
+	*dma_handle = virt_to_phys(ret);
+
+	return ret_nocache;
+}
+
+void dma_generic_free_coherent(struct device *dev, size_t size,
+			       void *vaddr, dma_addr_t dma_handle,
+			       struct dma_attrs *attrs)
+{
+	int order = get_order(size);
+	unsigned long pfn = dma_handle >> PAGE_SHIFT;
+	int k;
+
+	for (k = 0; k < (1 << order); k++)
+		__free_pages(pfn_to_page(pfn + k), 0);
+
+	iounmap(vaddr);
+}
+
+void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+		    enum dma_data_direction direction)
+{
+	void *addr;
+
+	addr = __in_29bit_mode() ?
+	       (void *)CAC_ADDR((unsigned long)vaddr) : vaddr;
+
+	switch (direction) {
+	case DMA_FROM_DEVICE:		/* invalidate only */
+		__flush_invalidate_region(addr, size);
+		break;
+	case DMA_TO_DEVICE:		/* writeback only */
+		__flush_wback_region(addr, size);
+		break;
+	case DMA_BIDIRECTIONAL:		/* writeback and invalidate */
+		__flush_purge_region(addr, size);
+		break;
+	default:
+		BUG();
+	}
+}
+EXPORT_SYMBOL(dma_cache_sync);
+
+static int __init memchunk_setup(char *str)
+{
+	return 1; /* accept anything that begins with "memchunk." */
+}
+__setup("memchunk.", memchunk_setup);
+
+static void __init memchunk_cmdline_override(char *name, unsigned long *sizep)
+{
+	char *p = boot_command_line;
+	int k = strlen(name);
+
+	while ((p = strstr(p, "memchunk."))) {
+		p += 9; /* strlen("memchunk.") */
+		if (!strncmp(name, p, k) && p[k] == '=') {
+			p += k + 1;
+			*sizep = memparse(p, NULL);
+			pr_info("%s: forcing memory chunk size to 0x%08lx\n",
+				name, *sizep);
+			break;
+		}
+	}
+}
+
+int __init platform_resource_setup_memory(struct platform_device *pdev,
+					  char *name, unsigned long memsize)
+{
+	struct resource *r;
+	dma_addr_t dma_handle;
+	void *buf;
+
+	r = pdev->resource + pdev->num_resources - 1;
+	if (r->flags) {
+		pr_warning("%s: unable to find empty space for resource\n",
+			name);
+		return -EINVAL;
+	}
+
+	memchunk_cmdline_override(name, &memsize);
+	if (!memsize)
+		return 0;
+
+	buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL);
+	if (!buf) {
+		pr_warning("%s: unable to allocate memory\n", name);
+		return -ENOMEM;
+	}
+
+	memset(buf, 0, memsize);
+
+	r->flags = IORESOURCE_MEM;
+	r->start = dma_handle;
+	r->end = r->start + memsize - 1;
+	r->name = name;
+	return 0;
+}