diff options
Diffstat (limited to 'drivers/staging/media/ipu3/ipu3-mmu.c')
| -rw-r--r-- | drivers/staging/media/ipu3/ipu3-mmu.c | 125 |
1 files changed, 49 insertions, 76 deletions
diff --git a/drivers/staging/media/ipu3/ipu3-mmu.c b/drivers/staging/media/ipu3/ipu3-mmu.c index cfc2bdfb14b3..3d969b0522ab 100644 --- a/drivers/staging/media/ipu3/ipu3-mmu.c +++ b/drivers/staging/media/ipu3/ipu3-mmu.c @@ -20,9 +20,6 @@ #include "ipu3-mmu.h" -#define IPU3_PAGE_SHIFT 12 -#define IPU3_PAGE_SIZE (1UL << IPU3_PAGE_SHIFT) - #define IPU3_PT_BITS 10 #define IPU3_PT_PTES (1UL << IPU3_PT_BITS) #define IPU3_PT_SIZE (IPU3_PT_PTES << 2) @@ -238,62 +235,31 @@ static int __imgu_mmu_map(struct imgu_mmu *mmu, unsigned long iova, return 0; } -/* - * The following four functions are implemented based on iommu.c - * drivers/iommu/iommu.c/iommu_pgsize(). +/** + * imgu_mmu_map - map a buffer to a physical address + * + * @info: MMU mappable range + * @iova: the virtual address + * @paddr: the physical address + * @size: length of the mappable area + * + * The function has been adapted from iommu_map() in + * drivers/iommu/iommu.c . */ -static size_t imgu_mmu_pgsize(unsigned long pgsize_bitmap, - unsigned long addr_merge, size_t size) -{ - unsigned int pgsize_idx; - size_t pgsize; - - /* Max page size that still fits into 'size' */ - pgsize_idx = __fls(size); - - /* need to consider alignment requirements ? */ - if (likely(addr_merge)) { - /* Max page size allowed by address */ - unsigned int align_pgsize_idx = __ffs(addr_merge); - - pgsize_idx = min(pgsize_idx, align_pgsize_idx); - } - - /* build a mask of acceptable page sizes */ - pgsize = (1UL << (pgsize_idx + 1)) - 1; - - /* throw away page sizes not supported by the hardware */ - pgsize &= pgsize_bitmap; - - /* make sure we're still sane */ - WARN_ON(!pgsize); - - /* pick the biggest page */ - pgsize_idx = __fls(pgsize); - pgsize = 1UL << pgsize_idx; - - return pgsize; -} - -/* drivers/iommu/iommu.c/iommu_map() */ int imgu_mmu_map(struct imgu_mmu_info *info, unsigned long iova, phys_addr_t paddr, size_t size) { struct imgu_mmu *mmu = to_imgu_mmu(info); - unsigned int min_pagesz; int ret = 0; - /* find out the minimum page size supported */ - min_pagesz = 1 << __ffs(mmu->geometry.pgsize_bitmap); - /* * both the virtual address and the physical one, as well as * the size of the mapping, must be aligned (at least) to the * size of the smallest page supported by the hardware */ - if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { - dev_err(mmu->dev, "unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", - iova, &paddr, size, min_pagesz); + if (!IS_ALIGNED(iova | paddr | size, IPU3_PAGE_SIZE)) { + dev_err(mmu->dev, "unaligned: iova 0x%lx pa %pa size 0x%zx\n", + iova, &paddr, size); return -EINVAL; } @@ -301,19 +267,15 @@ int imgu_mmu_map(struct imgu_mmu_info *info, unsigned long iova, iova, &paddr, size); while (size) { - size_t pgsize = imgu_mmu_pgsize(mmu->geometry.pgsize_bitmap, - iova | paddr, size); - - dev_dbg(mmu->dev, "mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", - iova, &paddr, pgsize); + dev_dbg(mmu->dev, "mapping: iova 0x%lx pa %pa\n", iova, &paddr); ret = __imgu_mmu_map(mmu, iova, paddr); if (ret) break; - iova += pgsize; - paddr += pgsize; - size -= pgsize; + iova += IPU3_PAGE_SIZE; + paddr += IPU3_PAGE_SIZE; + size -= IPU3_PAGE_SIZE; } call_if_imgu_is_powered(mmu, imgu_mmu_tlb_invalidate); @@ -321,28 +283,36 @@ int imgu_mmu_map(struct imgu_mmu_info *info, unsigned long iova, return ret; } -/* drivers/iommu/iommu.c/default_iommu_map_sg() */ +/** + * imgu_mmu_map_sg - Map a scatterlist + * + * @info: MMU mappable range + * @iova: the virtual address + * @sg: the scatterlist to map + * @nents: number of entries in the scatterlist + * + * The function has been adapted from default_iommu_map_sg() in + * drivers/iommu/iommu.c . + */ size_t imgu_mmu_map_sg(struct imgu_mmu_info *info, unsigned long iova, struct scatterlist *sg, unsigned int nents) { struct imgu_mmu *mmu = to_imgu_mmu(info); struct scatterlist *s; size_t s_length, mapped = 0; - unsigned int i, min_pagesz; + unsigned int i; int ret; - min_pagesz = 1 << __ffs(mmu->geometry.pgsize_bitmap); - for_each_sg(sg, s, nents, i) { phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset; s_length = s->length; - if (!IS_ALIGNED(s->offset, min_pagesz)) + if (!IS_ALIGNED(s->offset, IPU3_PAGE_SIZE)) goto out_err; - /* must be min_pagesz aligned to be mapped singlely */ - if (i == nents - 1 && !IS_ALIGNED(s->length, min_pagesz)) + /* must be IPU3_PAGE_SIZE aligned to be mapped singlely */ + if (i == nents - 1 && !IS_ALIGNED(s->length, IPU3_PAGE_SIZE)) s_length = PAGE_ALIGN(s->length); ret = imgu_mmu_map(info, iova + mapped, phys, s_length); @@ -394,25 +364,30 @@ static size_t __imgu_mmu_unmap(struct imgu_mmu *mmu, return unmap; } -/* drivers/iommu/iommu.c/iommu_unmap() */ +/** + * imgu_mmu_unmap - Unmap a buffer + * + * @info: MMU mappable range + * @iova: the virtual address + * @size: the length of the buffer + * + * The function has been adapted from iommu_unmap() in + * drivers/iommu/iommu.c . + */ size_t imgu_mmu_unmap(struct imgu_mmu_info *info, unsigned long iova, size_t size) { struct imgu_mmu *mmu = to_imgu_mmu(info); size_t unmapped_page, unmapped = 0; - unsigned int min_pagesz; - - /* find out the minimum page size supported */ - min_pagesz = 1 << __ffs(mmu->geometry.pgsize_bitmap); /* * The virtual address, as well as the size of the mapping, must be * aligned (at least) to the size of the smallest page supported * by the hardware */ - if (!IS_ALIGNED(iova | size, min_pagesz)) { - dev_err(mmu->dev, "unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", - iova, size, min_pagesz); + if (!IS_ALIGNED(iova | size, IPU3_PAGE_SIZE)) { + dev_err(mmu->dev, "unaligned: iova 0x%lx size 0x%zx\n", + iova, size); return -EINVAL; } @@ -423,10 +398,7 @@ size_t imgu_mmu_unmap(struct imgu_mmu_info *info, unsigned long iova, * or we hit an area that isn't mapped. */ while (unmapped < size) { - size_t pgsize = imgu_mmu_pgsize(mmu->geometry.pgsize_bitmap, - iova, size - unmapped); - - unmapped_page = __imgu_mmu_unmap(mmu, iova, pgsize); + unmapped_page = __imgu_mmu_unmap(mmu, iova, IPU3_PAGE_SIZE); if (!unmapped_page) break; @@ -444,6 +416,7 @@ size_t imgu_mmu_unmap(struct imgu_mmu_info *info, unsigned long iova, /** * imgu_mmu_init() - initialize IPU3 MMU block + * * @parent: struct device parent * @base: IOMEM base of hardware registers. * @@ -505,7 +478,6 @@ struct imgu_mmu_info *imgu_mmu_init(struct device *parent, void __iomem *base) mmu->geometry.aperture_start = 0; mmu->geometry.aperture_end = DMA_BIT_MASK(IPU3_MMU_ADDRESS_BITS); - mmu->geometry.pgsize_bitmap = IPU3_PAGE_SIZE; return &mmu->geometry; @@ -523,7 +495,8 @@ fail_group: /** * imgu_mmu_exit() - clean up IPU3 MMU block - * @info: IPU3 MMU private data + * + * @info: MMU mappable range */ void imgu_mmu_exit(struct imgu_mmu_info *info) { |