ARC: I/O and DMA Mappings

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 205 insertions, 0 deletions

diff --git a/arch/arc/include/asm/dma-mapping.h b/arch/arc/include/asm/dma-mapping.h
new file mode 100644
index 000000000000..7fd150e97eb2
--- /dev/null
+++ b/arch/arc/include/asm/dma-mapping.h
@@ -0,0 +1,205 @@
+/*
+ * DMA Mapping glue for ARC
+ *
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef ASM_ARC_DMA_MAPPING_H
+#define ASM_ARC_DMA_MAPPING_H
+
+#include <asm-generic/dma-coherent.h>
+#include <asm/cacheflush.h>
+#include <plat/dma_addr.h>
+
+void *dma_alloc_noncoherent(struct device *dev, size_t size,
+                            dma_addr_t *dma_handle, gfp_t gfp);
+
+void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
+                          dma_addr_t dma_handle);
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+                         dma_addr_t *dma_handle, gfp_t gfp);
+
+void dma_free_coherent(struct device *dev, size_t size, void *kvaddr,
+                       dma_addr_t dma_handle);
+
+/* drivers/base/dma-mapping.c */
+extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
+                           void *cpu_addr, dma_addr_t dma_addr, size_t size);
+extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
+                                  void *cpu_addr, dma_addr_t dma_addr,
+                                  size_t size);
+
+#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
+#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
+
+/*
+ * streaming DMA Mapping API...
+ * CPU accesses page via normal paddr, thus needs to explicitly made
+ * consistent before each use
+ */
+
+static inline void __inline_dma_cache_sync(unsigned long paddr, size_t size,
+                                           enum dma_data_direction dir)
+{
+        switch (dir) {
+        case DMA_FROM_DEVICE:
+                dma_cache_inv(paddr, size);
+                break;
+        case DMA_TO_DEVICE:
+                dma_cache_wback(paddr, size);
+                break;
+        case DMA_BIDIRECTIONAL:
+                dma_cache_wback_inv(paddr, size);
+                break;
+        default:
+                pr_err("Invalid DMA dir [%d] for OP @ %lx\n", dir, paddr);
+        }
+}
+
+void __arc_dma_cache_sync(unsigned long paddr, size_t size,
+                          enum dma_data_direction dir);
+
+#define _dma_cache_sync(addr, sz, dir)                  \
+do {                                                    \
+        if (__builtin_constant_p(dir))                  \
+                __inline_dma_cache_sync(addr, sz, dir); \
+        else                                            \
+                __arc_dma_cache_sync(addr, sz, dir);    \
+}                                                       \
+while (0);
+
+static inline dma_addr_t
+dma_map_single(struct device *dev, void *cpu_addr, size_t size,
+               enum dma_data_direction dir)
+{
+        _dma_cache_sync((unsigned long)cpu_addr, size, dir);
+        return plat_kernel_addr_to_dma(dev, cpu_addr);
+}
+
+static inline void
+dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
+                 size_t size, enum dma_data_direction dir)
+{
+}
+
+static inline dma_addr_t
+dma_map_page(struct device *dev, struct page *page,
+             unsigned long offset, size_t size,
+             enum dma_data_direction dir)
+{
+        unsigned long paddr = page_to_phys(page) + offset;
+        return dma_map_single(dev, (void *)paddr, size, dir);
+}
+
+static inline void
+dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
+               size_t size, enum dma_data_direction dir)
+{
+}
+
+static inline int
+dma_map_sg(struct device *dev, struct scatterlist *sg,
+           int nents, enum dma_data_direction dir)
+{
+        struct scatterlist *s;
+        int i;
+
+        for_each_sg(sg, s, nents, i)
+                sg->dma_address = dma_map_page(dev, sg_page(s), s->offset,
+                                               s->length, dir);
+
+        return nents;
+}
+
+static inline void
+dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+             int nents, enum dma_data_direction dir)
+{
+        struct scatterlist *s;
+        int i;
+
+        for_each_sg(sg, s, nents, i)
+                dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
+}
+
+static inline void
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+                        size_t size, enum dma_data_direction dir)
+{
+        _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,
+                        DMA_FROM_DEVICE);
+}
+
+static inline void
+dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+                           size_t size, enum dma_data_direction dir)
+{
+        _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,
+                        DMA_TO_DEVICE);
+}
+
+static inline void
+dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+                              unsigned long offset, size_t size,
+                              enum dma_data_direction direction)
+{
+        _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,
+                        size, DMA_FROM_DEVICE);
+}
+
+static inline void
+dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
+                                 unsigned long offset, size_t size,
+                                 enum dma_data_direction direction)
+{
+        _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,
+                        size, DMA_TO_DEVICE);
+}
+
+static inline void
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+                    enum dma_data_direction dir)
+{
+        int i;
+
+        for (i = 0; i < nelems; i++, sg++)
+                _dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
+}
+
+static inline void
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
+                       enum dma_data_direction dir)
+{
+        int i;
+
+        for (i = 0; i < nelems; i++, sg++)
+                _dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
+}
+
+static inline int dma_supported(struct device *dev, u64 dma_mask)
+{
+        /* Support 32 bit DMA mask exclusively */
+        return dma_mask == DMA_BIT_MASK(32);
+}
+
+static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+        return 0;
+}
+
+static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+        if (!dev->dma_mask || !dma_supported(dev, dma_mask))
+                return -EIO;
+
+        *dev->dma_mask = dma_mask;
+
+        return 0;
+}
+
+#endif