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Diffstat (limited to 'arch/nds32/kernel/dma.c')
-rw-r--r--arch/nds32/kernel/dma.c196
1 files changed, 55 insertions, 141 deletions
diff --git a/arch/nds32/kernel/dma.c b/arch/nds32/kernel/dma.c
index d291800fc621..d0dbd4fe9645 100644
--- a/arch/nds32/kernel/dma.c
+++ b/arch/nds32/kernel/dma.c
@@ -3,17 +3,14 @@
#include <linux/types.h>
#include <linux/mm.h>
-#include <linux/export.h>
#include <linux/string.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-noncoherent.h>
#include <linux/io.h>
#include <linux/cache.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
-#include <asm/dma-mapping.h>
#include <asm/proc-fns.h>
/*
@@ -22,11 +19,6 @@
static pte_t *consistent_pte;
static DEFINE_RAW_SPINLOCK(consistent_lock);
-enum master_type {
- FOR_CPU = 0,
- FOR_DEVICE = 1,
-};
-
/*
* VM region handling support.
*
@@ -124,10 +116,8 @@ out:
return c;
}
-/* FIXME: attrs is not used. */
-static void *nds32_dma_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t * handle, gfp_t gfp,
- unsigned long attrs)
+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
+ gfp_t gfp, unsigned long attrs)
{
struct page *page;
struct arch_vm_region *c;
@@ -232,8 +222,8 @@ no_page:
return NULL;
}
-static void nds32_dma_free(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t handle, unsigned long attrs)
+void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
+ dma_addr_t handle, unsigned long attrs)
{
struct arch_vm_region *c;
unsigned long flags, addr;
@@ -333,145 +323,69 @@ static int __init consistent_init(void)
}
core_initcall(consistent_init);
-static void consistent_sync(void *vaddr, size_t size, int direction, int master_type);
-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)
-{
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- consistent_sync((void *)(page_address(page) + offset), size, dir, FOR_DEVICE);
- return page_to_phys(page) + offset;
-}
-
-static void nds32_dma_unmap_page(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- consistent_sync(phys_to_virt(handle), size, dir, FOR_CPU);
-}
-
-/*
- * 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 inline void cache_op(phys_addr_t paddr, size_t size,
+ void (*fn)(unsigned long start, unsigned long end))
{
- int i;
+ struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
+ unsigned offset = paddr & ~PAGE_MASK;
+ size_t left = size;
+ unsigned long start;
- for (i = 0; i < nents; i++, sg++) {
- void *virt;
- unsigned long pfn;
- struct page *page = sg_page(sg);
+ do {
+ size_t len = left;
- 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);
+ 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 {
- 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);
+ start = (unsigned long)phys_to_virt(paddr);
+ fn(start, start + size);
}
- }
- return nents;
+ offset = 0;
+ page++;
+ left -= len;
+ } while (left);
}
-static void nds32_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nhwentries, enum dma_data_direction dir,
- unsigned long attrs)
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
{
-}
-
-static void
-nds32_dma_sync_single_for_cpu(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_CPU);
-}
-
-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);
-}
-
-static void
-nds32_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction dir)
-{
- 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);
+ switch (dir) {
+ case DMA_FROM_DEVICE:
+ break;
+ case DMA_TO_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ cache_op(paddr, size, cpu_dma_wb_range);
+ break;
+ default:
+ BUG();
}
}
-static void
-nds32_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
{
- 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);
+ switch (dir) {
+ case DMA_TO_DEVICE:
+ break;
+ case DMA_FROM_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ cache_op(paddr, size, cpu_dma_inval_range);
+ break;
+ default:
+ BUG();
}
}
-
-struct dma_map_ops nds32_dma_ops = {
- .alloc = nds32_dma_alloc_coherent,
- .free = nds32_dma_free,
- .map_page = nds32_dma_map_page,
- .unmap_page = nds32_dma_unmap_page,
- .map_sg = nds32_dma_map_sg,
- .unmap_sg = nds32_dma_unmap_sg,
- .sync_single_for_device = nds32_dma_sync_single_for_device,
- .sync_single_for_cpu = nds32_dma_sync_single_for_cpu,
- .sync_sg_for_cpu = nds32_dma_sync_sg_for_cpu,
- .sync_sg_for_device = nds32_dma_sync_sg_for_device,
-};
-
-EXPORT_SYMBOL(nds32_dma_ops);
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