[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, 79 insertions, 0 deletions

diff --git a/arch/mips/pci/pci-dac.c b/arch/mips/pci/pci-dac.c
new file mode 100644
index 00000000000..0f0ea1b7d4d
--- /dev/null
+++ b/arch/mips/pci/pci-dac.c
@@ -0,0 +1,79 @@
+/*
+ * 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) 2000  Ani Joshi <ajoshi@unixbox.com>
+ * Copyright (C) 2000, 2001, 06  Ralf Baechle <ralf@linux-mips.org>
+ * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
+ */
+
+#include <linux/types.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <asm/cache.h>
+#include <asm/io.h>
+
+#include <dma-coherence.h>
+
+#include <linux/pci.h>
+
+dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
+	struct page *page, unsigned long offset, int direction)
+{
+	struct device *dev = &pdev->dev;
+
+	BUG_ON(direction == DMA_NONE);
+
+	if (!plat_device_is_coherent(dev)) {
+		unsigned long addr;
+
+		addr = (unsigned long) page_address(page) + offset;
+		dma_cache_wback_inv(addr, PAGE_SIZE);
+	}
+
+	return plat_map_dma_mem_page(dev, page) + offset;
+}
+
+EXPORT_SYMBOL(pci_dac_page_to_dma);
+
+struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
+	dma64_addr_t dma_addr)
+{
+	return pfn_to_page(plat_dma_addr_to_phys(dma_addr) >> PAGE_SHIFT);
+}
+
+EXPORT_SYMBOL(pci_dac_dma_to_page);
+
+unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
+	dma64_addr_t dma_addr)
+{
+	return dma_addr & ~PAGE_MASK;
+}
+
+EXPORT_SYMBOL(pci_dac_dma_to_offset);
+
+void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
+	dma64_addr_t dma_addr, size_t len, int direction)
+{
+	BUG_ON(direction == PCI_DMA_NONE);
+
+	if (!plat_device_is_coherent(&pdev->dev))
+		dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
+}
+
+EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu);
+
+void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
+	dma64_addr_t dma_addr, size_t len, int direction)
+{
+	BUG_ON(direction == PCI_DMA_NONE);
+
+	if (!plat_device_is_coherent(&pdev->dev))
+		dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
+}
+
+EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);