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6d60b6ee0c
This patch contains code that interfaces with devices that are mandated by the RISC-V supervisor specification and that don't have explicit drivers anywhere else in the tree. This includes the staticly defined interrupts, the CSR-mapped timer, and virtualized SBI devices. Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
/*
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* Copyright (C) 2003-2004 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Copyright (C) 2012 ARM Ltd.
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* Copyright (C) 2016 SiFive, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_RISCV_DMA_MAPPING_H
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#define __ASM_RISCV_DMA_MAPPING_H
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/* Use ops->dma_mapping_error (if it exists) or assume success */
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// #undef DMA_ERROR_CODE
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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return &dma_noop_ops;
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}
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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{
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if (!dev->dma_mask)
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return false;
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return addr + size - 1 <= *dev->dma_mask;
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}
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#endif /* __ASM_RISCV_DMA_MAPPING_H */
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