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/* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
*
* Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
*/
#ifndef _IOMMU_COMMON_H
#define _IOMMU_COMMON_H
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/device.h>
#include <asm/iommu.h>
#include <asm/scatterlist.h>
/*
* These give mapping size of each iommu pte/tlb.
*/
#define IO_PAGE_SHIFT 13
#define IO_PAGE_SIZE (1UL << IO_PAGE_SHIFT)
#define IO_PAGE_MASK (~(IO_PAGE_SIZE-1))
#define IO_PAGE_ALIGN(addr) (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
#define IO_TSB_ENTRIES (128*1024)
#define IO_TSB_SIZE (IO_TSB_ENTRIES * 8)
/*
* This is the hardwired shift in the iotlb tag/data parts.
*/
#define IOMMU_PAGE_SHIFT 13
#define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
static inline unsigned long iommu_num_pages(unsigned long vaddr,
unsigned long slen)
{
unsigned long npages;
npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
npages >>= IO_PAGE_SHIFT;
return npages;
}
static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems)
{
unsigned long i, npages = 0;
struct scatterlist *sg;
for_each_sg(sglist, sg, nelems, i) {
unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
npages += iommu_num_pages(paddr, sg->length);
}
return npages;
}
#endif /* _IOMMU_COMMON_H */
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