1 files changed, 46 insertions, 0 deletions

diff --git a/arch/sh/boards/overdrive/pcidma.c b/arch/sh/boards/overdrive/pcidma.c
new file mode 100644
index 00000000000..1c9bfeda00b
--- /dev/null
+++ b/arch/sh/boards/overdrive/pcidma.c
@@ -0,0 +1,46 @@
+/* 
+ * Copyright (C) 2000 David J. Mckay (david.mckay@st.com)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.                            
+ *
+ * Dynamic DMA mapping support.
+ *
+ * On the overdrive, we can only DMA from memory behind the PCI bus!
+ * this means that all DMA'able memory must come from there. 
+ * this restriction will not apply to later boards.
+ */
+
+#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;
+
+        printk("BUG: pci_alloc_consistent() called - not yet supported\n");
+        /* We ALWAYS need DMA memory on the overdrive hardware,
+         * due to it's extreme weirdness
+         * Need to flush the cache here as well, since the memory
+         * can still be seen through the cache!
+         */
+        gfp |= GFP_DMA;
+        ret = (void *) __get_free_pages(gfp, get_order(size));
+
+        if (ret != NULL) {
+                memset(ret, 0, size);
+                *dma_handle = virt_to_bus(ret);
+        }
+        return 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));
+}