1 files changed, 48 insertions, 0 deletions
diff --git a/arch/mips/ddb5476/pci-dma.c b/arch/mips/ddb5476/pci-dma.c
new file mode 100644
index 000000000..c0f35772c
--- /dev/null
+++ b/arch/mips/ddb5476/pci-dma.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2000   Ani Joshi <ajoshi@unixbox.com>
+ *
+ *
+ * Dynamic DMA mapping support.
+ *
+ * swiped from i386, and cloned for MIPS by Geert.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+
+/*
+ * [jsun] We want to return non-cached area so that data can be consistent
+ * Apparently on x86, this is not an issue because cache is automatically
+ * invalidated.
+ *
+ * To make we are doing the right thing, I add some extra debug macros.
+ */
+
+void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
+			   dma_addr_t *dma_handle)
+{
+	void *ret;
+	int gfp = GFP_ATOMIC;
+
+	if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
+		gfp |= GFP_DMA;
+	ret = (void *)__get_free_pages(gfp, get_order(size));
+
+	if (ret != NULL) {
+		dma_cache_inv((unsigned long)ret, size);
+		*dma_handle = virt_to_bus(ret);
+	}
+        ret = (void*) ((unsigned long)ret | 0x20000000);
+	return ret;
+}
+
+void pci_free_consistent(struct pci_dev *hwdev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle)
+{
+        vaddr = (void*) ((unsigned long)vaddr & ~0x20000000);
+	free_pages((unsigned long)vaddr, get_order(size));
+}