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author | Michal Simek <monstr@monstr.eu> | 2010-01-14 13:21:02 +0300 |
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committer | Michal Simek <monstr@monstr.eu> | 2010-03-11 15:56:29 +0300 |
commit | ccfe27d7000668b02d10fc3e06aa49e3e3603162 (patch) | |
tree | d8d624f6bd9aebf6a848f9762b0d8ed62ee2c5a6 /arch/microblaze/include/asm/dma-mapping.h | |
parent | 522dba7134d6b2e5821d3457f7941ec34f668e6d (diff) | |
download | linux-ccfe27d7000668b02d10fc3e06aa49e3e3603162.tar.xz |
microblaze: Support DMA
Add DMA support for Microblaze. There are some part of this new feature:
1. Basic DMA support
2. Enable DMA debug option
3. Setup notifier
Ad 1. dma-mapping come from powerpc and x86 version and it is based on
generic dma-mapping-common.h
Ad 2. DMA support debug features which is used in generic file.
For more information please look at Documentation/DMA-API.txt
Ad 3. notifier is very important to setup dma_ops. Without this part
for example ll_temac driver failed because there are no setup dma operations.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/include/asm/dma-mapping.h')
-rw-r--r-- | arch/microblaze/include/asm/dma-mapping.h | 155 |
1 files changed, 154 insertions, 1 deletions
diff --git a/arch/microblaze/include/asm/dma-mapping.h b/arch/microblaze/include/asm/dma-mapping.h index d00e40099165..096fa96ee736 100644 --- a/arch/microblaze/include/asm/dma-mapping.h +++ b/arch/microblaze/include/asm/dma-mapping.h @@ -1 +1,154 @@ -#include <asm-generic/dma-mapping-broken.h> +/* + * Implements the generic device dma API for microblaze and the pci + * + * Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2009-2010 PetaLogix + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * This file is base on powerpc and x86 dma-mapping.h versions + * Copyright (C) 2004 IBM + */ + +#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H +#define _ASM_MICROBLAZE_DMA_MAPPING_H + +/* + * See Documentation/PCI/PCI-DMA-mapping.txt and + * Documentation/DMA-API.txt for documentation. + */ + +#include <linux/types.h> +#include <linux/cache.h> +#include <linux/mm.h> +#include <linux/scatterlist.h> +#include <linux/dma-debug.h> +#include <linux/dma-attrs.h> +#include <asm/io.h> +#include <asm-generic/dma-coherent.h> + +#define DMA_ERROR_CODE (~(dma_addr_t)0x0) + +#define __dma_alloc_coherent(dev, gfp, size, handle) NULL +#define __dma_free_coherent(size, addr) ((void)0) +#define __dma_sync(addr, size, rw) ((void)0) +#define __dma_sync_page(pg, off, sz, rw) ((void)0) + +static inline unsigned long device_to_mask(struct device *dev) +{ + if (dev->dma_mask && *dev->dma_mask) + return *dev->dma_mask; + /* Assume devices without mask can take 32 bit addresses */ + return 0xfffffffful; +} + +extern struct dma_map_ops *dma_ops; + +/* + * Available generic sets of operations + */ +extern struct dma_map_ops dma_direct_ops; + +static inline struct dma_map_ops *get_dma_ops(struct device *dev) +{ + /* We don't handle the NULL dev case for ISA for now. We could + * do it via an out of line call but it is not needed for now. The + * only ISA DMA device we support is the floppy and we have a hack + * in the floppy driver directly to get a device for us. + */ + if (unlikely(!dev) || !dev->archdata.dma_ops) + return NULL; + + return dev->archdata.dma_ops; +} + +static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops) +{ + dev->archdata.dma_ops = ops; +} + +static inline int dma_supported(struct device *dev, u64 mask) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + if (unlikely(!ops)) + return 0; + if (!ops->dma_supported) + return 1; + return ops->dma_supported(dev, mask); +} + +#ifdef CONFIG_PCI +/* We have our own implementation of pci_set_dma_mask() */ +#define HAVE_ARCH_PCI_SET_DMA_MASK + +#endif + +static inline int dma_set_mask(struct device *dev, u64 dma_mask) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + if (unlikely(ops == NULL)) + return -EIO; + if (ops->set_dma_mask) + return ops->set_dma_mask(dev, dma_mask); + if (!dev->dma_mask || !dma_supported(dev, dma_mask)) + return -EIO; + *dev->dma_mask = dma_mask; + return 0; +} + +#include <asm-generic/dma-mapping-common.h> + +static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + if (ops->mapping_error) + return ops->mapping_error(dev, dma_addr); + + return (dma_addr == DMA_ERROR_CODE); +} + +#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) +#define dma_is_consistent(d, h) (1) + +static inline void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + void *memory; + + BUG_ON(!ops); + + memory = ops->alloc_coherent(dev, size, dma_handle, flag); + + debug_dma_alloc_coherent(dev, size, *dma_handle, memory); + return memory; +} + +static inline void dma_free_coherent(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_handle) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!ops); + debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); + ops->free_coherent(dev, size, cpu_addr, dma_handle); +} + +static inline int dma_get_cache_alignment(void) +{ + return L1_CACHE_BYTES; +} + +static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); + __dma_sync(vaddr, size, (int)direction); +} + +#endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */ |