xref: /openbmc/linux/arch/sparc/kernel/iommu_common.h (revision 06301c5e)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
3  *
4  * Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
5  */
6 
7 #ifndef _IOMMU_COMMON_H
8 #define _IOMMU_COMMON_H
9 
10 #include <linux/kernel.h>
11 #include <linux/types.h>
12 #include <linux/sched.h>
13 #include <linux/mm.h>
14 #include <linux/scatterlist.h>
15 #include <linux/device.h>
16 #include <linux/iommu-helper.h>
17 
18 #include <asm/iommu.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 
is_span_boundary(unsigned long entry,unsigned long shift,unsigned long boundary_size,struct scatterlist * outs,struct scatterlist * sg)38 static inline int is_span_boundary(unsigned long entry,
39 				   unsigned long shift,
40 				   unsigned long boundary_size,
41 				   struct scatterlist *outs,
42 				   struct scatterlist *sg)
43 {
44 	unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
45 	int nr = iommu_num_pages(paddr, outs->dma_length + sg->length,
46 				 IO_PAGE_SIZE);
47 
48 	return iommu_is_span_boundary(entry, nr, shift, boundary_size);
49 }
50 
51 #endif /* _IOMMU_COMMON_H */
52