diff options
Diffstat (limited to 'arch/sh/kernel/dma-coherent.c')
-rw-r--r-- | arch/sh/kernel/dma-coherent.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/sh/kernel/dma-coherent.c b/arch/sh/kernel/dma-coherent.c new file mode 100644 index 0000000000..6a44c0e7ba --- /dev/null +++ b/arch/sh/kernel/dma-coherent.c @@ -0,0 +1,33 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2004 - 2007 Paul Mundt + */ +#include <linux/mm.h> +#include <linux/dma-map-ops.h> +#include <asm/cacheflush.h> +#include <asm/addrspace.h> + +void arch_dma_prep_coherent(struct page *page, size_t size) +{ + __flush_purge_region(page_address(page), size); +} + +void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) +{ + void *addr = sh_cacheop_vaddr(phys_to_virt(paddr)); + + switch (dir) { + case DMA_FROM_DEVICE: /* invalidate only */ + __flush_invalidate_region(addr, size); + break; + case DMA_TO_DEVICE: /* writeback only */ + __flush_wback_region(addr, size); + break; + case DMA_BIDIRECTIONAL: /* writeback and invalidate */ + __flush_purge_region(addr, size); + break; + default: + BUG(); + } +} |