*/
extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
+/**
+ * dma_alloc_writethrough - allocate consistent memory for DMA
+ * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
+ * @size: required memory size
+ * @handle: bus-specific DMA address
+ *
+ * Allocate some writethrough cached, for a device for
+ * performing DMA. This function allocates pages, and will
+ * return the CPU-viewed address, and sets @handle to be the
+ * device-viewed address.
+ */
+extern void *dma_alloc_writethrough(struct device *, size_t, dma_addr_t *, gfp_t);
+
/**
* dma_free_coherent - free memory allocated by dma_alloc_coherent
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
#define pgprot_writecombine(prot) \
__pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE)
+#define pgprot_writethrough(prot) \
+ __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_WRITETHROUGH)
+
#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
#define pgprot_dmacoherent(prot) \
__pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN)
}
EXPORT_SYMBOL(dma_alloc_writecombine);
+/*
+ * Allocate DMA-writethrough memory space and return both the kernel remapped
+ * virtual and bus address for that space.
+ */
+void *
+dma_alloc_writethrough(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
+{
+ return __dma_alloc(dev, size, handle, gfp,
+ pgprot_writethrough(pgprot_kernel));
+}
+EXPORT_SYMBOL(dma_alloc_writethrough);
+
static int dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size)
{