1 files changed, 71 insertions, 0 deletions

diff --git a/arch/sh/drivers/pci/dma-dreamcast.c b/arch/sh/drivers/pci/dma-dreamcast.c
new file mode 100644
index 000000000000..83de7ef4e7df
--- /dev/null
+++ b/arch/sh/drivers/pci/dma-dreamcast.c
@@ -0,0 +1,71 @@
+/*
+ * arch/sh/pci/dma-dreamcast.c
+ *
+ * PCI DMA support for the Sega Dreamcast
+ *
+ * Copyright (C) 2001, 2002  M. R. Brown
+ * Copyright (C) 2002, 2003  Paul Mundt
+ *
+ * This file originally bore the message (with enclosed-$):
+ *      Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
+ *      Dreamcast PCI: Supports SEGA Broadband Adaptor only.
+ *
+ * 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/config.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach/pci.h>
+
+static int gapspci_dma_used = 0;
+
+void *dreamcast_consistent_alloc(struct device *dev, size_t size,
+                                 dma_addr_t *dma_handle, int flag)
+{
+        unsigned long buf;
+
+        if (dev && dev->bus != &pci_bus_type)
+                return NULL;
+
+        if (gapspci_dma_used + size > GAPSPCI_DMA_SIZE)
+                return ERR_PTR(-EINVAL);
+
+        buf = GAPSPCI_DMA_BASE + gapspci_dma_used;
+
+        gapspci_dma_used = PAGE_ALIGN(gapspci_dma_used+size);
+
+        *dma_handle = (dma_addr_t)buf;
+
+        buf = P2SEGADDR(buf);
+
+        /* Flush the dcache before we hand off the buffer */
+        dma_cache_wback_inv((void *)buf, size);
+
+        return (void *)buf;
+}
+
+int dreamcast_consistent_free(struct device *dev, size_t size,
+                         void *vaddr, dma_addr_t dma_handle)
+{
+        if (dev && dev->bus != &pci_bus_type)
+                return -EINVAL;
+
+        /* XXX */
+        gapspci_dma_used = 0;
+
+        return 0;
+}
+