patch-2.3.48 linux/arch/mips/sni/dma.c

• Lines: 43
• Date: Thu Feb 24 22:52:30 2000
• Orig file: v2.3.47/linux/arch/mips/sni/dma.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.47/linux/arch/mips/sni/dma.c linux/arch/mips/sni/dma.c
@@ -0,0 +1,42 @@
+/* $Id: dma.c,v 1.2 2000/02/24 00:12:41 ralf Exp $
+ *
+ * Dynamic DMA mapping support.
+ *
+ * On RM200 there is no hardware dynamic DMA address translation,
+ * so consistent alloc/free are merely page allocation/freeing.
+ * The rest of the dynamic DMA mapping interface is implemented
+ * in <asm/pci.h>.
+ *
+ * These routines assume that the RM has all it's memory at physical
+ * addresses of < 512mb.
+ */
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+
+void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
+			   dma_addr_t *dma_handle)
+{
+	void *ret;
+	int gfp = GFP_ATOMIC;
+	int order = get_order(size);
+
+	if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
+		gfp |= GFP_DMA;
+	ret = (void *)__get_free_pages(gfp, order);
+
+	if (ret != NULL) {
+		memset(ret, 0, size);
+		*dma_handle = virt_to_bus(ret);
+	}
+	dma_cache_wback_inv(ret, PAGE_SIZE << order);
+	return KSEG1ADDR(ret);
+}
+
+void pci_free_consistent(struct pci_dev *hwdev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle)
+{
+	free_pages((unsigned long)vaddr, get_order(size));
+}