#ifndef ASMARM_PCI_H
#define ASMARM_PCI_H

#define pcibios_assign_all_busses()	0

#define PCIBIOS_MIN_IO		0x8000
#define PCIBIOS_MIN_MEM		0x40000000

#ifdef __KERNEL__

#include <asm/scatterlist.h>
#include <asm/io.h>

struct pci_dev;

/* Allocate and map kernel buffer using consistent mode DMA for a device.
 * hwdev should be valid struct pci_dev pointer for PCI devices,
 * NULL for PCI-like buses (ISA, EISA).
 * Returns non-NULL cpu-view pointer to the buffer if successful and
 * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
 * is undefined.
 */
#define pci_alloc_consistent(hwdev,size,handle)		\
	({						\
		void *__ret;				\
		int __gfp = GFP_KERNEL;			\
							\
		if ((hwdev) == NULL ||			\
		    (hwdev)->dma_mask != 0xffffffff)	\
			__gfp |= GFP_DMA;		\
							\
		__ret = consistent_alloc(__gfp, (size),	\
					 (handle));	\
		__ret;					\
	})

/* Free and unmap a consistent DMA buffer.
 * cpu_addr is what was returned from pci_alloc_consistent,
 * size must be the same as what as passed into pci_alloc_consistent,
 * and likewise dma_addr must be the same as what *dma_addrp was set to.
 *
 * References to the memory and mappings associated with cpu_addr/dma_addr
 * past this call are illegal.
 */
extern inline void
pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr,
		    dma_addr_t dma_handle)
{
	consistent_free(vaddr);
}

/* Map a single buffer of the indicated size for DMA in streaming mode.
 * The 32-bit bus address to use is returned.
 *
 * Once the device is given the dma address, the device owns this memory
 * until either pci_unmap_single or pci_dma_sync_single is performed.
 */
extern inline dma_addr_t
pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size)
{
	consistent_sync(ptr, size, 3);
	return virt_to_bus(ptr);
}

/* Unmap a single streaming mode DMA translation.  The dma_addr and size
 * must match what was provided for in a previous pci_map_single call.  All
 * other usages are undefined.
 *
 * After this call, reads by the cpu to the buffer are guarenteed to see
 * whatever the device wrote there.
 */
extern inline void
pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size)
{
	/* nothing to do */
}

/* Map a set of buffers described by scatterlist in streaming
 * mode for DMA.  This is the scather-gather version of the
 * above pci_map_single interface.  Here the scatter gather list
 * elements are each tagged with the appropriate dma address
 * and length.  They are obtained via sg_dma_{address,length}(SG).
 *
 * NOTE: An implementation may be able to use a smaller number of
 *       DMA address/length pairs than there are SG table elements.
 *       (for example via virtual mapping capabilities)
 *       The routine returns the number of addr/length pairs actually
 *       used, at most nents.
 *
 * Device ownership issues as mentioned above for pci_map_single are
 * the same here.
 */
extern inline int
pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents)
{
	int i;

	for (i = 0; i < nents; i++, sg++)
		consistent_sync(sg->address, sg->length, 3);

	return nents;
}

/* Unmap a set of streaming mode DMA translations.
 * Again, cpu read rules concerning calls here are the same as for
 * pci_unmap_single() above.
 */
extern inline void
pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents)
{
	/* nothing to do */
}

/* Make physical memory consistent for a single
 * streaming mode DMA translation after a transfer.
 *
 * If you perform a pci_map_single() but wish to interrogate the
 * buffer using the cpu, yet do not wish to teardown the PCI dma
 * mapping, you must call this function before doing so.  At the
 * next point you give the PCI dma address back to the card, the
 * device again owns the buffer.
 */
extern inline void
pci_dma_sync_single(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size)
{
	consistent_sync(bus_to_virt(dma_handle), size, 3);
}

/* Make physical memory consistent for a set of streaming
 * mode DMA translations after a transfer.
 *
 * The same as pci_dma_sync_single but for a scatter-gather list,
 * same rules and usage.
 */
extern inline void
pci_dma_sync_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nelems)
{
	int i;

	for (i = 0; i < nelems; i++, sg++)
		consistent_sync(sg->address, sg->length, 3);
}

/* These macros should be used after a pci_map_sg call has been done
 * to get bus addresses of each of the SG entries and their lengths.
 * You should only work with the number of sg entries pci_map_sg
 * returns, or alternatively stop on the first sg_dma_len(sg) which
 * is 0.
 */
#define sg_dma_address(sg)      (virt_to_bus((sg)->address))
#define sg_dma_len(sg)          ((sg)->length)

#endif /* __KERNEL__ */
 
#endif
