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Diffstat (limited to 'arch/mips/mm/dma-noncoherent.c')
-rw-r--r--arch/mips/mm/dma-noncoherent.c400
1 files changed, 400 insertions, 0 deletions
diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c
new file mode 100644
index 00000000000..9895e32b0fc
--- /dev/null
+++ b/arch/mips/mm/dma-noncoherent.c
@@ -0,0 +1,400 @@
+/*
+ * 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 Ralf Baechle <ralf@gnu.org>
+ * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
+ */
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/cache.h>
+#include <asm/io.h>
+
+/*
+ * Warning on the terminology - Linux calls an uncached area coherent;
+ * MIPS terminology calls memory areas with hardware maintained coherency
+ * coherent.
+ */
+
+void *dma_alloc_noncoherent(struct device *dev, size_t size,
+ dma_addr_t * dma_handle, int gfp)
+{
+ void *ret;
+ /* ignore region specifiers */
+ gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+ if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
+ gfp |= GFP_DMA;
+ ret = (void *) __get_free_pages(gfp, get_order(size));
+
+ if (ret != NULL) {
+ memset(ret, 0, size);
+ *dma_handle = virt_to_phys(ret);
+ }
+
+ return ret;
+}
+
+EXPORT_SYMBOL(dma_alloc_noncoherent);
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t * dma_handle, int gfp)
+{
+ void *ret;
+
+ ret = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
+ if (ret) {
+ dma_cache_wback_inv((unsigned long) ret, size);
+ ret = UNCAC_ADDR(ret);
+ }
+
+ return ret;
+}
+
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle)
+{
+ free_pages((unsigned long) vaddr, get_order(size));
+}
+
+EXPORT_SYMBOL(dma_free_noncoherent);
+
+void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle)
+{
+ unsigned long addr = (unsigned long) vaddr;
+
+ addr = CAC_ADDR(addr);
+ free_pages(addr, get_order(size));
+}
+
+EXPORT_SYMBOL(dma_free_coherent);
+
+static inline void __dma_sync(unsigned long addr, size_t size,
+ enum dma_data_direction direction)
+{
+ switch (direction) {
+ case DMA_TO_DEVICE:
+ dma_cache_wback(addr, size);
+ break;
+
+ case DMA_FROM_DEVICE:
+ dma_cache_inv(addr, size);
+ break;
+
+ case DMA_BIDIRECTIONAL:
+ dma_cache_wback_inv(addr, size);
+ break;
+
+ default:
+ BUG();
+ }
+}
+
+dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction direction)
+{
+ unsigned long addr = (unsigned long) ptr;
+
+ switch (direction) {
+ case DMA_TO_DEVICE:
+ dma_cache_wback(addr, size);
+ break;
+
+ case DMA_FROM_DEVICE:
+ dma_cache_inv(addr, size);
+ break;
+
+ case DMA_BIDIRECTIONAL:
+ dma_cache_wback_inv(addr, size);
+ break;
+
+ default:
+ BUG();
+ }
+
+ return virt_to_phys(ptr);
+}
+
+EXPORT_SYMBOL(dma_map_single);
+
+void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
+ enum dma_data_direction direction)
+{
+ unsigned long addr;
+ addr = dma_addr + PAGE_OFFSET;
+
+ switch (direction) {
+ case DMA_TO_DEVICE:
+ //dma_cache_wback(addr, size);
+ break;
+
+ case DMA_FROM_DEVICE:
+ //dma_cache_inv(addr, size);
+ break;
+
+ case DMA_BIDIRECTIONAL:
+ //dma_cache_wback_inv(addr, size);
+ break;
+
+ default:
+ BUG();
+ }
+}
+
+EXPORT_SYMBOL(dma_unmap_single);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction direction)
+{
+ int i;
+
+ BUG_ON(direction == DMA_NONE);
+
+ for (i = 0; i < nents; i++, sg++) {
+ unsigned long addr;
+
+ addr = (unsigned long) page_address(sg->page);
+ if (addr)
+ __dma_sync(addr + sg->offset, sg->length, direction);
+ sg->dma_address = (dma_addr_t)
+ (page_to_phys(sg->page) + sg->offset);
+ }
+
+ return nents;
+}
+
+EXPORT_SYMBOL(dma_map_sg);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size, enum dma_data_direction direction)
+{
+ unsigned long addr;
+
+ BUG_ON(direction == DMA_NONE);
+
+ addr = (unsigned long) page_address(page) + offset;
+ dma_cache_wback_inv(addr, size);
+
+ return page_to_phys(page) + offset;
+}
+
+EXPORT_SYMBOL(dma_map_page);
+
+void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
+ enum dma_data_direction direction)
+{
+ BUG_ON(direction == DMA_NONE);
+
+ if (direction != DMA_TO_DEVICE) {
+ unsigned long addr;
+
+ addr = dma_address + PAGE_OFFSET;
+ dma_cache_wback_inv(addr, size);
+ }
+}
+
+EXPORT_SYMBOL(dma_unmap_page);
+
+void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
+ enum dma_data_direction direction)
+{
+ unsigned long addr;
+ int i;
+
+ BUG_ON(direction == DMA_NONE);
+
+ if (direction == DMA_TO_DEVICE)
+ return;
+
+ for (i = 0; i < nhwentries; i++, sg++) {
+ addr = (unsigned long) page_address(sg->page);
+ if (!addr)
+ continue;
+ dma_cache_wback_inv(addr + sg->offset, sg->length);
+ }
+}
+
+EXPORT_SYMBOL(dma_unmap_sg);
+
+void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction direction)
+{
+ unsigned long addr;
+
+ BUG_ON(direction == DMA_NONE);
+
+ addr = dma_handle + PAGE_OFFSET;
+ __dma_sync(addr, size, direction);
+}
+
+EXPORT_SYMBOL(dma_sync_single_for_cpu);
+
+void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction direction)
+{
+ unsigned long addr;
+
+ BUG_ON(direction == DMA_NONE);
+
+ addr = dma_handle + PAGE_OFFSET;
+ __dma_sync(addr, size, direction);
+}
+
+EXPORT_SYMBOL(dma_sync_single_for_device);
+
+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)
+{
+ unsigned long addr;
+
+ BUG_ON(direction == DMA_NONE);
+
+ addr = dma_handle + offset + PAGE_OFFSET;
+ __dma_sync(addr, size, direction);
+}
+
+EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
+
+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)
+{
+ unsigned long addr;
+
+ BUG_ON(direction == DMA_NONE);
+
+ addr = dma_handle + offset + PAGE_OFFSET;
+ __dma_sync(addr, size, direction);
+}
+
+EXPORT_SYMBOL(dma_sync_single_range_for_device);
+
+void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+ enum dma_data_direction direction)
+{
+ int i;
+
+ BUG_ON(direction == DMA_NONE);
+
+ /* Make sure that gcc doesn't leave the empty loop body. */
+ for (i = 0; i < nelems; i++, sg++)
+ __dma_sync((unsigned long)page_address(sg->page),
+ sg->length, direction);
+}
+
+EXPORT_SYMBOL(dma_sync_sg_for_cpu);
+
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
+ enum dma_data_direction direction)
+{
+ int i;
+
+ BUG_ON(direction == DMA_NONE);
+
+ /* Make sure that gcc doesn't leave the empty loop body. */
+ for (i = 0; i < nelems; i++, sg++)
+ __dma_sync((unsigned long)page_address(sg->page),
+ sg->length, direction);
+}
+
+EXPORT_SYMBOL(dma_sync_sg_for_device);
+
+int dma_mapping_error(dma_addr_t dma_addr)
+{
+ return 0;
+}
+
+EXPORT_SYMBOL(dma_mapping_error);
+
+int 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 < 0x00ffffff)
+ return 0;
+
+ return 1;
+}
+
+EXPORT_SYMBOL(dma_supported);
+
+int dma_is_consistent(dma_addr_t dma_addr)
+{
+ return 1;
+}
+
+EXPORT_SYMBOL(dma_is_consistent);
+
+void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction direction)
+{
+ if (direction == DMA_NONE)
+ return;
+
+ dma_cache_wback_inv((unsigned long)vaddr, size);
+}
+
+EXPORT_SYMBOL(dma_cache_sync);
+
+/* The DAC routines are a PCIism.. */
+
+#ifdef CONFIG_PCI
+
+#include <linux/pci.h>
+
+dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
+ struct page *page, unsigned long offset, int direction)
+{
+ return (dma64_addr_t)page_to_phys(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 mem_map + (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);
+
+ 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);
+
+ dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
+}
+
+EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);
+
+#endif /* CONFIG_PCI */
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