[MIPS] Unify dma-{coherent,noncoherent.ip27,ip32}

Platforms will now have to supply a function dma_device_is_coherent which
returns if a particular device participates in the coherence domain.  For
most platforms this function will always return 0 or 1.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 49 insertions, 0 deletions

diff --git a/include/asm-mips/mach-ip27/dma-coherence.h b/include/asm-mips/mach-ip27/dma-coherence.h
new file mode 100644
index 00000000000..659816e200d
--- /dev/null
+++ b/include/asm-mips/mach-ip27/dma-coherence.h
@@ -0,0 +1,49 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2006  Ralf Baechle <ralf@linux-mips.org>
+ *
+ */
+#ifndef __ASM_MACH_IP27_DMA_COHERENCE_H
+#define __ASM_MACH_IP27_DMA_COHERENCE_H
+
+#include <asm/pci/bridge.h>
+
+#define pdev_to_baddr(pdev, addr) \
+	(BRIDGE_CONTROLLER(pdev->bus)->baddr + (addr))
+#define dev_to_baddr(dev, addr) \
+	pdev_to_baddr(to_pci_dev(dev), (addr))
+
+struct device;
+
+static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)
+{
+	dma_addr_t pa = dev_to_baddr(dev, virt_to_phys(addr));
+
+	return pa;
+}
+
+static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
+{
+	dma_addr_t pa = dev_to_baddr(dev, page_to_phys(page));
+
+	return pa;
+}
+
+static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
+{
+	return dma_addr & (0xffUL << 56);
+}
+
+static void plat_unmap_dma_mem(dma_addr_t dma_addr)
+{
+}
+
+static inline int plat_device_is_coherent(struct device *dev)
+{
+	return 1;		/* IP27 non-cohernet mode is unsupported */
+}
+
+#endif /* __ASM_MACH_IP27_DMA_COHERENCE_H */