static pte_t *consistent_pte;
static DEFINE_RAW_SPINLOCK(consistent_lock);
-enum master_type {
- FOR_CPU = 0,
- FOR_DEVICE = 1,
-};
-
/*
* VM region handling support.
*
}
core_initcall(consistent_init);
-static void consistent_sync(void *vaddr, size_t size, int direction, int master_type);
+
+static inline void cache_op(phys_addr_t paddr, size_t size,
+ void (*fn)(unsigned long start, unsigned long end))
+{
+ struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
+ unsigned offset = paddr & ~PAGE_MASK;
+ size_t left = size;
+ unsigned long start;
+
+ do {
+ size_t len = left;
+
+ if (PageHighMem(page)) {
+ void *addr;
+
+ if (offset + len > PAGE_SIZE) {
+ if (offset >= PAGE_SIZE) {
+ page += offset >> PAGE_SHIFT;
+ offset &= ~PAGE_MASK;
+ }
+ len = PAGE_SIZE - offset;
+ }
+
+ addr = kmap_atomic(page);
+ start = (unsigned long)(addr + offset);
+ fn(start, start + len);
+ kunmap_atomic(addr);
+ } else {
+ start = (unsigned long)phys_to_virt(paddr);
+ fn(start, start + size);
+ }
+ offset = 0;
+ page++;
+ left -= len;
+ } while (left);
+}
+
+static void
+nds32_dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir)
+{
+ switch (dir) {
+ case DMA_FROM_DEVICE:
+ break;
+ case DMA_TO_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ cache_op(handle, size, cpu_dma_wb_range);
+ break;
+ default:
+ BUG();
+ }
+}
+
+static void
+nds32_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir)
+{
+ switch (dir) {
+ case DMA_TO_DEVICE:
+ break;
+ case DMA_FROM_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ cache_op(handle, size, cpu_dma_inval_range);
+ break;
+ default:
+ BUG();
+ }
+}
+
static dma_addr_t nds32_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
unsigned long attrs)
{
+ dma_addr_t dma_addr = page_to_phys(page) + offset;
+
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- consistent_sync((void *)(page_address(page) + offset), size, dir, FOR_DEVICE);
- return page_to_phys(page) + offset;
+ nds32_dma_sync_single_for_device(dev, handle, size, dir);
+ return dma_addr;
}
static void nds32_dma_unmap_page(struct device *dev, dma_addr_t handle,
unsigned long attrs)
{
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- consistent_sync(phys_to_virt(handle), size, dir, FOR_CPU);
+ nds32_dma_sync_single_for_cpu(dev, handle, size, dir);
}
-/*
- * Make an area consistent for devices.
- */
-static void consistent_sync(void *vaddr, size_t size, int direction, int master_type)
-{
- unsigned long start = (unsigned long)vaddr;
- unsigned long end = start + size;
-
- if (master_type == FOR_CPU) {
- switch (direction) {
- case DMA_TO_DEVICE:
- break;
- case DMA_FROM_DEVICE:
- case DMA_BIDIRECTIONAL:
- cpu_dma_inval_range(start, end);
- break;
- default:
- BUG();
- }
- } else {
- /* FOR_DEVICE */
- switch (direction) {
- case DMA_FROM_DEVICE:
- break;
- case DMA_TO_DEVICE:
- case DMA_BIDIRECTIONAL:
- cpu_dma_wb_range(start, end);
- break;
- default:
- BUG();
- }
- }
-}
-
-static int nds32_dma_map_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir,
- unsigned long attrs)
+static void
+nds32_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir)
{
int i;
for (i = 0; i < nents; i++, sg++) {
- void *virt;
- unsigned long pfn;
- struct page *page = sg_page(sg);
-
- sg->dma_address = sg_phys(sg);
- pfn = page_to_pfn(page) + sg->offset / PAGE_SIZE;
- page = pfn_to_page(pfn);
- if (PageHighMem(page)) {
- virt = kmap_atomic(page);
- consistent_sync(virt, sg->length, dir, FOR_CPU);
- kunmap_atomic(virt);
- } else {
- if (sg->offset > PAGE_SIZE)
- panic("sg->offset:%08x > PAGE_SIZE\n",
- sg->offset);
- virt = page_address(page) + sg->offset;
- consistent_sync(virt, sg->length, dir, FOR_CPU);
- }
+ nds32_dma_sync_single_for_device(dev, sg_dma_address(sg),
+ sg->length, dir);
}
- return nents;
-}
-
-static void nds32_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nhwentries, enum dma_data_direction dir,
- unsigned long attrs)
-{
}
static void
-nds32_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir)
+nds32_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
{
- consistent_sync((void *)phys_to_virt(handle), size, dir, FOR_CPU);
-}
+ int i;
-static void
-nds32_dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir)
-{
- consistent_sync((void *)phys_to_virt(handle), size, dir, FOR_DEVICE);
+ for (i = 0; i < nents; i++, sg++) {
+ nds32_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
+ sg->length, dir);
+ }
}
-static void
-nds32_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction dir)
+static int nds32_dma_map_sg(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir,
+ unsigned long attrs)
{
int i;
for (i = 0; i < nents; i++, sg++) {
- char *virt =
- page_address((struct page *)sg->page_link) + sg->offset;
- consistent_sync(virt, sg->length, dir, FOR_CPU);
+ nds32_dma_sync_single_for_device(dev, sg_dma_address(sg),
+ sg->length, dir);
}
+ return nents;
}
-static void
-nds32_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
+static void nds32_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+ int nhwentries, enum dma_data_direction dir,
+ unsigned long attrs)
{
int i;
- for (i = 0; i < nents; i++, sg++) {
- char *virt =
- page_address((struct page *)sg->page_link) + sg->offset;
- consistent_sync(virt, sg->length, dir, FOR_DEVICE);
+ for (i = 0; i < nhwentries; i++, sg++) {
+ nds32_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
+ sg->length, dir);
}
}
projects / linux.git / blobdiff