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-rw-r--r--arch/mn10300/mm/dma-alloc.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/mn10300/mm/dma-alloc.c b/arch/mn10300/mm/dma-alloc.c
index f3649d8f50e3..ee82d624b3c6 100644
--- a/arch/mn10300/mm/dma-alloc.c
+++ b/arch/mn10300/mm/dma-alloc.c
@@ -16,12 +16,24 @@
#include <linux/pci.h>
#include <asm/io.h>
+static unsigned long pci_sram_allocated = 0xbc000000;
+
void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, int gfp)
{
unsigned long addr;
void *ret;
+ printk("dma_alloc_coherent(%s,%zu,,%x)\n", dev_name(dev), size, gfp);
+
+ if (0xbe000000 - pci_sram_allocated >= size) {
+ size = (size + 255) & ~255;
+ addr = pci_sram_allocated;
+ pci_sram_allocated += size;
+ ret = (void *) addr;
+ goto done;
+ }
+
/* ignore region specifiers */
gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
@@ -41,7 +53,9 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
/* write back and evict all cache lines covering this region */
mn10300_dcache_flush_inv_range2(virt_to_phys((void *) addr), PAGE_SIZE);
+done:
*dma_handle = virt_to_bus((void *) addr);
+ printk("dma_alloc_coherent() = %p [%x]\n", ret, *dma_handle);
return ret;
}
EXPORT_SYMBOL(dma_alloc_coherent);
@@ -51,6 +65,9 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
{
unsigned long addr = (unsigned long) vaddr & ~0x20000000;
+ if (addr >= 0x9c000000)
+ return;
+
free_pages(addr, get_order(size));
}
EXPORT_SYMBOL(dma_free_coherent);