1 files changed, 119 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-powertv/dma-coherence.h b/arch/mips/include/asm/mach-powertv/dma-coherence.h
new file mode 100644
index 0000000..5b8d5eb
--- /dev/null
+++ b/arch/mips/include/asm/mach-powertv/dma-coherence.h
@@ -0,0 +1,119 @@
+/*
+ * 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.
+ *
+ * Version from mach-generic modified to support PowerTV port
+ * Portions Copyright (C) 2009  Cisco Systems, Inc.
+ * Copyright (C) 2006  Ralf Baechle <ralf@linux-mips.org>
+ *
+ */
+
+#ifndef __ASM_MACH_POWERTV_DMA_COHERENCE_H
+#define __ASM_MACH_POWERTV_DMA_COHERENCE_H
+
+#include <linux/sched.h>
+#include <linux/version.h>
+#include <linux/device.h>
+#include <asm/mach-powertv/asic.h>
+
+static inline bool is_kseg2(void *addr)
+{
+	return (unsigned long)addr >= KSEG2;
+}
+
+static inline unsigned long virt_to_phys_from_pte(void *addr)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *ptep, pte;
+
+	unsigned long virt_addr = (unsigned long)addr;
+	unsigned long phys_addr = 0UL;
+
+	/* get the page global directory. */
+	pgd = pgd_offset_k(virt_addr);
+
+	if (!pgd_none(*pgd)) {
+		/* get the page upper directory */
+		pud = pud_offset(pgd, virt_addr);
+		if (!pud_none(*pud)) {
+			/* get the page middle directory */
+			pmd = pmd_offset(pud, virt_addr);
+			if (!pmd_none(*pmd)) {
+				/* get a pointer to the page table entry */
+				ptep = pte_offset(pmd, virt_addr);
+				pte = *ptep;
+				/* check for a valid page */
+				if (pte_present(pte)) {
+					/* get the physical address the page is
+					 * refering to */
+					phys_addr = (unsigned long)
+						page_to_phys(pte_page(pte));
+					/* add the offset within the page */
+					phys_addr |= (virt_addr & ~PAGE_MASK);
+				}
+			}
+		}
+	}
+
+	return phys_addr;
+}
+
+static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
+	size_t size)
+{
+	if (is_kseg2(addr))
+		return phys_to_bus(virt_to_phys_from_pte(addr));
+	else
+		return phys_to_bus(virt_to_phys(addr));
+}
+
+static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
+	struct page *page)
+{
+	return phys_to_bus(page_to_phys(page));
+}
+
+static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
+	dma_addr_t dma_addr)
+{
+	return bus_to_phys(dma_addr);
+}
+
+static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
+	size_t size, enum dma_data_direction direction)
+{
+}
+
+static inline int plat_dma_supported(struct device *dev, u64 mask)
+{
+	/*
+	 * we fall back to GFP_DMA when the mask isn't all 1s,
+	 * so we can't guarantee allocations that must be
+	 * within a tighter range than GFP_DMA..
+	 */
+	if (mask < DMA_BIT_MASK(24))
+		return 0;
+
+	return 1;
+}
+
+static inline void plat_extra_sync_for_device(struct device *dev)
+{
+	return;
+}
+
+static inline int plat_dma_mapping_error(struct device *dev,
+					 dma_addr_t dma_addr)
+{
+	return 0;
+}
+
+static inline int plat_device_is_coherent(struct device *dev)
+{
+	return 0;
+}
+
+#endif /* __ASM_MACH_POWERTV_DMA_COHERENCE_H */