diff options
| author | Becky Bruce <beckyb@kernel.crashing.org> | 2009-05-14 12:42:28 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-06-09 16:49:18 +1000 |
| commit | ec3cf2ece22a8ede7478bf38e2a818986322662b (patch) | |
| tree | 76654ac60da3d2ac27f49769f825215d55b03276 /arch/powerpc/include/asm | |
| parent | 1babddbc2e83ab98fc4dd0a3e9bd7b2d30be7e32 (diff) | |
powerpc: Add support for swiotlb on 32-bit
This patch includes the basic infrastructure to use swiotlb
bounce buffering on 32-bit powerpc. It is not yet enabled on
any platforms. Probably the most interesting bit is the
addition of addr_needs_map to dma_ops - we need this as
a dma_op because the decision of whether or not an addr
can be mapped by a device is device-specific.
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/dma-mapping.h | 11 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/swiotlb.h | 27 |
2 files changed, 38 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h index cb448d68452..3d9e887c3c0 100644 --- a/arch/powerpc/include/asm/dma-mapping.h +++ b/arch/powerpc/include/asm/dma-mapping.h @@ -15,9 +15,18 @@ #include <linux/scatterlist.h> #include <linux/dma-attrs.h> #include <asm/io.h> +#include <asm/swiotlb.h> #define DMA_ERROR_CODE (~(dma_addr_t)0x0) +/* Some dma direct funcs must be visible for use in other dma_ops */ +extern void *dma_direct_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag); +extern void dma_direct_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle); + +extern unsigned long get_dma_direct_offset(struct device *dev); + #ifdef CONFIG_NOT_COHERENT_CACHE /* * DMA-consistent mapping functions for PowerPCs that don't support @@ -78,6 +87,8 @@ struct dma_mapping_ops { dma_addr_t dma_address, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs); + int (*addr_needs_map)(struct device *dev, dma_addr_t addr, + size_t size); #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS void (*sync_single_range_for_cpu)(struct device *hwdev, dma_addr_t dma_handle, unsigned long offset, diff --git a/arch/powerpc/include/asm/swiotlb.h b/arch/powerpc/include/asm/swiotlb.h new file mode 100644 index 00000000000..30891d6e2bc --- /dev/null +++ b/arch/powerpc/include/asm/swiotlb.h @@ -0,0 +1,27 @@ +/* + * Copyright (C) 2009 Becky Bruce, Freescale Semiconductor + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#ifndef __ASM_SWIOTLB_H +#define __ASM_SWIOTLB_H + +#include <linux/swiotlb.h> + +extern struct dma_mapping_ops swiotlb_dma_ops; +extern struct dma_mapping_ops swiotlb_pci_dma_ops; + +int swiotlb_arch_address_needs_mapping(struct device *, dma_addr_t, + size_t size); + +static inline void dma_mark_clean(void *addr, size_t size) {} + +extern unsigned int ppc_swiotlb_enable; +int __init swiotlb_setup_bus_notifier(void); + +#endif /* __ASM_SWIOTLB_H */ |