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-rw-r--r--arch/tile/kernel/pci-dma.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c
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+++ b/arch/tile/kernel/pci-dma.c
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+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/vmalloc.h>
+#include <asm/tlbflush.h>
+#include <asm/homecache.h>
+
+/* Generic DMA mapping functions: */
+
+/*
+ * Allocate what Linux calls "coherent" memory, which for us just
+ * means uncached.
+ */
+void *dma_alloc_coherent(struct device *dev,
+ size_t size,
+ dma_addr_t *dma_handle,
+ gfp_t gfp)
+{
+ u64 dma_mask = dev->coherent_dma_mask ?: DMA_BIT_MASK(32);
+ int node = dev_to_node(dev);
+ int order = get_order(size);
+ struct page *pg;
+ dma_addr_t addr;
+
+ gfp |= __GFP_ZERO;
+
+ /*
+ * By forcing NUMA node 0 for 32-bit masks we ensure that the
+ * high 32 bits of the resulting PA will be zero. If the mask
+ * size is, e.g., 24, we may still not be able to guarantee a
+ * suitable memory address, in which case we will return NULL.
+ * But such devices are uncommon.
+ */
+ if (dma_mask <= DMA_BIT_MASK(32))
+ node = 0;
+
+ pg = homecache_alloc_pages_node(node, gfp, order, PAGE_HOME_UNCACHED);
+ if (pg == NULL)
+ return NULL;
+
+ addr = page_to_phys(pg);
+ if (addr + size > dma_mask) {
+ homecache_free_pages(addr, order);
+ return NULL;
+ }
+
+ *dma_handle = addr;
+ return page_address(pg);
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+/*
+ * Free memory that was allocated with dma_alloc_coherent.
+ */
+void dma_free_coherent(struct device *dev, size_t size,
+ void *vaddr, dma_addr_t dma_handle)
+{
+ homecache_free_pages((unsigned long)vaddr, get_order(size));
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+/*
+ * The map routines "map" the specified address range for DMA
+ * accesses. The memory belongs to the device after this call is
+ * issued, until it is unmapped with dma_unmap_single.
+ *
+ * We don't need to do any mapping, we just flush the address range
+ * out of the cache and return a DMA address.
+ *
+ * The unmap routines do whatever is necessary before the processor
+ * accesses the memory again, and must be called before the driver
+ * touches the memory. We can get away with a cache invalidate if we
+ * can count on nothing having been touched.
+ */
+
+
+/*
+ * dma_map_single can be passed any memory address, and there appear
+ * to be no alignment constraints.
+ *
+ * There is a chance that the start of the buffer will share a cache
+ * line with some other data that has been touched in the meantime.
+ */
+dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction direction)
+{
+ struct page *page;
+ dma_addr_t dma_addr;
+ int thispage;
+
+ BUG_ON(!valid_dma_direction(direction));
+ WARN_ON(size == 0);
+
+ dma_addr = __pa(ptr);
+
+ /* We might have been handed a buffer that wraps a page boundary */
+ while ((int)size > 0) {
+ /* The amount to flush that's on this page */
+ thispage = PAGE_SIZE - ((unsigned long)ptr & (PAGE_SIZE - 1));
+ thispage = min((int)thispage, (int)size);
+ /* Is this valid for any page we could be handed? */
+ page = pfn_to_page(kaddr_to_pfn(ptr));
+ homecache_flush_cache(page, 0);
+ ptr += thispage;
+ size -= thispage;
+ }
+
+ return dma_addr;
+}
+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)
+{
+ BUG_ON(!valid_dma_direction(direction));
+}
+EXPORT_SYMBOL(dma_unmap_single);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
+ enum dma_data_direction direction)
+{
+ struct scatterlist *sg;
+ int i;
+
+ BUG_ON(!valid_dma_direction(direction));
+
+ WARN_ON(nents == 0 || sglist->length == 0);
+
+ for_each_sg(sglist, sg, nents, i) {
+ struct page *page;
+ sg->dma_address = sg_phys(sg);
+ page = pfn_to_page(sg->dma_address >> PAGE_SHIFT);
+ homecache_flush_cache(page, 0);
+ }
+
+ return nents;
+}
+EXPORT_SYMBOL(dma_map_sg);
+
+void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
+ enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+}
+EXPORT_SYMBOL(dma_unmap_sg);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+
+ homecache_flush_cache(page, 0);
+
+ return page_to_pa(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(!valid_dma_direction(direction));
+}
+EXPORT_SYMBOL(dma_unmap_page);
+
+void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(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 start = PFN_DOWN(dma_handle);
+ unsigned long end = PFN_DOWN(dma_handle + size - 1);
+ unsigned long i;
+
+ BUG_ON(!valid_dma_direction(direction));
+ for (i = start; i <= end; ++i)
+ homecache_flush_cache(pfn_to_page(i), 0);
+}
+EXPORT_SYMBOL(dma_sync_single_for_device);
+
+void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+ enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+ WARN_ON(nelems == 0 || sg[0].length == 0);
+}
+EXPORT_SYMBOL(dma_sync_sg_for_cpu);
+
+/*
+ * Flush and invalidate cache for scatterlist.
+ */
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
+ int nelems, enum dma_data_direction direction)
+{
+ struct scatterlist *sg;
+ int i;
+
+ BUG_ON(!valid_dma_direction(direction));
+ WARN_ON(nelems == 0 || sglist->length == 0);
+
+ for_each_sg(sglist, sg, nelems, i) {
+ dma_sync_single_for_device(dev, sg->dma_address,
+ sg_dma_len(sg), direction);
+ }
+}
+EXPORT_SYMBOL(dma_sync_sg_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)
+{
+ dma_sync_single_for_cpu(dev, dma_handle + offset, 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)
+{
+ dma_sync_single_for_device(dev, dma_handle + offset, size, direction);
+}
+EXPORT_SYMBOL(dma_sync_single_range_for_device);
+
+/*
+ * dma_alloc_noncoherent() returns non-cacheable memory, so there's no
+ * need to do any flushing here.
+ */
+void dma_cache_sync(void *vaddr, size_t size,
+ enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_cache_sync);