diff options
| -rw-r--r-- | arch/microblaze/include/asm/pgtable.h | 1 | ||||
| -rw-r--r-- | arch/microblaze/kernel/dma.c | 27 | ||||
| -rw-r--r-- | arch/microblaze/mm/consistent.c | 25 |
3 files changed, 48 insertions, 5 deletions
diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h index 95cef0b5f83..df19d0c47be 100644 --- a/arch/microblaze/include/asm/pgtable.h +++ b/arch/microblaze/include/asm/pgtable.h @@ -565,6 +565,7 @@ void consistent_free(size_t size, void *vaddr); void consistent_sync(void *vaddr, size_t size, int direction); void consistent_sync_page(struct page *page, unsigned long offset, size_t size, int direction); +unsigned long consistent_virt_to_pfn(void *vaddr); void setup_memory(void); #endif /* __ASSEMBLY__ */ diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c index 4633c36c1b3..ed7ba8a1182 100644 --- a/arch/microblaze/kernel/dma.c +++ b/arch/microblaze/kernel/dma.c @@ -154,9 +154,36 @@ dma_direct_sync_sg_for_device(struct device *dev, __dma_sync(sg->dma_address, sg->length, direction); } +int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t handle, size_t size, + struct dma_attrs *attrs) +{ +#ifdef CONFIG_MMU + unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + unsigned long off = vma->vm_pgoff; + unsigned long pfn; + + if (off >= count || user_count > (count - off)) + return -ENXIO; + +#ifdef NOT_COHERENT_CACHE + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + pfn = consistent_virt_to_pfn(cpu_addr); +#else + pfn = virt_to_pfn(cpu_addr); +#endif + return remap_pfn_range(vma, vma->vm_start, pfn + off, + vma->vm_end - vma->vm_start, vma->vm_page_prot); +#else + return -ENXIO; +#endif +} + struct dma_map_ops dma_direct_ops = { .alloc = dma_direct_alloc_coherent, .free = dma_direct_free_coherent, + .mmap = dma_direct_mmap_coherent, .map_sg = dma_direct_map_sg, .dma_supported = dma_direct_dma_supported, .map_page = dma_direct_map_page, diff --git a/arch/microblaze/mm/consistent.c b/arch/microblaze/mm/consistent.c index e10ad930895..b06c3a7faf2 100644 --- a/arch/microblaze/mm/consistent.c +++ b/arch/microblaze/mm/consistent.c @@ -156,6 +156,25 @@ void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *dma_handle) } EXPORT_SYMBOL(consistent_alloc); +#ifdef CONFIG_MMU +static pte_t *consistent_virt_to_pte(void *vaddr) +{ + unsigned long addr = (unsigned long)vaddr; + + return pte_offset_kernel(pmd_offset(pgd_offset_k(addr), addr), addr); +} + +unsigned long consistent_virt_to_pfn(void *vaddr) +{ + pte_t *ptep = consistent_virt_to_pte(vaddr); + + if (pte_none(*ptep) || !pte_present(*ptep)) + return 0; + + return pte_pfn(*ptep); +} +#endif + /* * free page(s) as defined by the above mapping. */ @@ -181,13 +200,9 @@ void consistent_free(size_t size, void *vaddr) } while (size -= PAGE_SIZE); #else do { - pte_t *ptep; + pte_t *ptep = consistent_virt_to_pte(vaddr); unsigned long pfn; - ptep = pte_offset_kernel(pmd_offset(pgd_offset_k( - (unsigned int)vaddr), - (unsigned int)vaddr), - (unsigned int)vaddr); if (!pte_none(*ptep) && pte_present(*ptep)) { pfn = pte_pfn(*ptep); pte_clear(&init_mm, (unsigned int)vaddr, ptep); |