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Diffstat (limited to 'arch/sparc/kernel/iommu_common.h')
| -rw-r--r-- | arch/sparc/kernel/iommu_common.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/sparc/kernel/iommu_common.h b/arch/sparc/kernel/iommu_common.h new file mode 100644 index 000000000..e3c02ba32 --- /dev/null +++ b/arch/sparc/kernel/iommu_common.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* 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 <linux/iommu-helper.h> + +#include <asm/iommu.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) ALIGN(addr, IO_PAGE_SIZE) + +#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 int is_span_boundary(unsigned long entry, + unsigned long shift, + unsigned long boundary_size, + struct scatterlist *outs, + struct scatterlist *sg) +{ + unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs); + int nr = iommu_num_pages(paddr, outs->dma_length + sg->length, + IO_PAGE_SIZE); + + return iommu_is_span_boundary(entry, nr, shift, boundary_size); +} + +#define SPARC_MAPPING_ERROR (~(dma_addr_t)0x0) + +#endif /* _IOMMU_COMMON_H */ |