diff options
Diffstat (limited to 'arch/riscv/include/asm/dma-mapping.h')
| -rw-r--r-- | arch/riscv/include/asm/dma-mapping.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/dma-mapping.h b/arch/riscv/include/asm/dma-mapping.h new file mode 100644 index 000000000000..3eec1000196d --- /dev/null +++ b/arch/riscv/include/asm/dma-mapping.h @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2003-2004 Hewlett-Packard Co + * David Mosberger-Tang <davidm@hpl.hp.com> + * Copyright (C) 2012 ARM Ltd. + * Copyright (C) 2016 SiFive, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef __ASM_RISCV_DMA_MAPPING_H +#define __ASM_RISCV_DMA_MAPPING_H + +/* Use ops->dma_mapping_error (if it exists) or assume success */ +// #undef DMA_ERROR_CODE + +static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) +{ + return &dma_noop_ops; +} + +static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) +{ + if (!dev->dma_mask) + return false; + + return addr + size - 1 <= *dev->dma_mask; +} + +#endif /* __ASM_RISCV_DMA_MAPPING_H */ |