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Diffstat (limited to 'arch/sh64/kernel/pci-dma.c')
-rw-r--r--arch/sh64/kernel/pci-dma.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/sh64/kernel/pci-dma.c b/arch/sh64/kernel/pci-dma.c
new file mode 100644
index 000000000000..a36c3d71a3fe
--- /dev/null
+++ b/arch/sh64/kernel/pci-dma.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
+ * Copyright (C) 2003 Paul Mundt (lethal@linux-sh.org)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License. See linux/COPYING for more information.
+ *
+ * Dynamic DMA mapping support.
+ */
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+
+void *consistent_alloc(struct pci_dev *hwdev, size_t size,
+ dma_addr_t *dma_handle)
+{
+ void *ret;
+ int gfp = GFP_ATOMIC;
+ void *vp;
+
+ if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
+ gfp |= GFP_DMA;
+
+ ret = (void *)__get_free_pages(gfp, get_order(size));
+
+ /* now call our friend ioremap_nocache to give us an uncached area */
+ vp = ioremap_nocache(virt_to_phys(ret), size);
+
+ if (vp != NULL) {
+ memset(vp, 0, size);
+ *dma_handle = virt_to_bus(ret);
+ dma_cache_wback_inv((unsigned long)ret, size);
+ }
+
+ return vp;
+}
+
+void consistent_free(struct pci_dev *hwdev, size_t size,
+ void *vaddr, dma_addr_t dma_handle)
+{
+ void *alloc;
+
+ alloc = bus_to_virt((unsigned long)dma_handle);
+ free_pages((unsigned long)alloc, get_order(size));
+
+ iounmap(vaddr);
+}
+