Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-pull
[linux-2.6] / arch / sparc64 / kernel / iommu_common.h
1 /* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
2  *
3  * Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
4  */
5
6 #ifndef _IOMMU_COMMON_H
7 #define _IOMMU_COMMON_H
8
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/scatterlist.h>
14 #include <linux/device.h>
15 #include <linux/iommu-helper.h>
16
17 #include <asm/iommu.h>
18 #include <asm/scatterlist.h>
19
20 /*
21  * These give mapping size of each iommu pte/tlb.
22  */
23 #define IO_PAGE_SHIFT                   13
24 #define IO_PAGE_SIZE                    (1UL << IO_PAGE_SHIFT)
25 #define IO_PAGE_MASK                    (~(IO_PAGE_SIZE-1))
26 #define IO_PAGE_ALIGN(addr)             ALIGN(addr, IO_PAGE_SIZE)
27
28 #define IO_TSB_ENTRIES                  (128*1024)
29 #define IO_TSB_SIZE                     (IO_TSB_ENTRIES * 8)
30
31 /*
32  * This is the hardwired shift in the iotlb tag/data parts.
33  */
34 #define IOMMU_PAGE_SHIFT                13
35
36 #define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
37
38 static inline unsigned long iommu_num_pages(unsigned long vaddr,
39                                             unsigned long slen)
40 {
41         unsigned long npages;
42
43         npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
44         npages >>= IO_PAGE_SHIFT;
45
46         return npages;
47 }
48
49 static inline int is_span_boundary(unsigned long entry,
50                                    unsigned long shift,
51                                    unsigned long boundary_size,
52                                    struct scatterlist *outs,
53                                    struct scatterlist *sg)
54 {
55         unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
56         int nr = iommu_num_pages(paddr, outs->dma_length + sg->length);
57
58         return iommu_is_span_boundary(entry, nr, shift, boundary_size);
59 }
60
61 extern unsigned long iommu_range_alloc(struct device *dev,
62                                        struct iommu *iommu,
63                                        unsigned long npages,
64                                        unsigned long *handle);
65 extern void iommu_range_free(struct iommu *iommu,
66                              dma_addr_t dma_addr,
67                              unsigned long npages);
68
69 #endif /* _IOMMU_COMMON_H */