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author | Richard Kuo <rkuo@codeaurora.org> | 2011-10-31 18:52:22 -0500 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-01 07:34:20 -0700 |
commit | 65c3d7c525414d672c849d8696d6b8a3ebbae059 (patch) | |
tree | 7d55319ff4ff54c398aa1e1c6ee9c494ec898e8d /arch/hexagon/include | |
parent | 5df87c1556515dfae504da342990821f407a8c99 (diff) | |
download | linux-65c3d7c525414d672c849d8696d6b8a3ebbae059.tar.gz linux-65c3d7c525414d672c849d8696d6b8a3ebbae059.tar.bz2 linux-65c3d7c525414d672c849d8696d6b8a3ebbae059.zip |
Hexagon: Provide DMA implementation
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/hexagon/include')
-rw-r--r-- | arch/hexagon/include/asm/dma-mapping.h | 101 | ||||
-rw-r--r-- | arch/hexagon/include/asm/dma.h | 29 |
2 files changed, 130 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/dma-mapping.h b/arch/hexagon/include/asm/dma-mapping.h new file mode 100644 index 000000000000..448b224ba4ef --- /dev/null +++ b/arch/hexagon/include/asm/dma-mapping.h @@ -0,0 +1,101 @@ +/* + * DMA operations for the Hexagon architecture + * + * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#ifndef _ASM_DMA_MAPPING_H +#define _ASM_DMA_MAPPING_H + +#include <linux/types.h> +#include <linux/cache.h> +#include <linux/mm.h> +#include <linux/scatterlist.h> +#include <linux/dma-mapping.h> +#include <linux/dma-debug.h> +#include <linux/dma-attrs.h> +#include <asm/io.h> + +struct device; +extern int bad_dma_address; + +extern struct dma_map_ops *dma_ops; + +#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) +#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) + +static inline struct dma_map_ops *get_dma_ops(struct device *dev) +{ + if (unlikely(dev == NULL)) + return NULL; + + return dma_ops; +} + +extern int dma_supported(struct device *dev, u64 mask); +extern int dma_set_mask(struct device *dev, u64 mask); +extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle); +extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction); + +#include <asm-generic/dma-mapping-common.h> + +static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) +{ + if (!dev->dma_mask) + return 0; + return addr + size - 1 <= *dev->dma_mask; +} + +static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + struct dma_map_ops *dma_ops = get_dma_ops(dev); + + if (dma_ops->mapping_error) + return dma_ops->mapping_error(dev, dma_addr); + + return (dma_addr == bad_dma_address); +} + +static inline void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag) +{ + void *ret; + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!dma_ops); + + ret = ops->alloc_coherent(dev, size, dma_handle, flag); + + debug_dma_alloc_coherent(dev, size, *dma_handle, ret); + + return ret; +} + +static inline void dma_free_coherent(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_handle) +{ + struct dma_map_ops *dma_ops = get_dma_ops(dev); + + BUG_ON(!dma_ops); + + dma_ops->free_coherent(dev, size, cpu_addr, dma_handle); + + debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); +} + +#endif diff --git a/arch/hexagon/include/asm/dma.h b/arch/hexagon/include/asm/dma.h new file mode 100644 index 000000000000..da6d2f61a93a --- /dev/null +++ b/arch/hexagon/include/asm/dma.h @@ -0,0 +1,29 @@ +/* + * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#ifndef _ASM_DMA_H +#define _ASM_DMA_H + +#include <asm/io.h> + +#define MAX_DMA_CHANNELS 1 +#define MAX_DMA_ADDRESS (PAGE_OFFSET) + +extern size_t hexagon_coherent_pool_size; + +#endif |