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| author | Richard Kuo <rkuo@codeaurora.org> | 2013-04-09 03:30:12 +0400 |
|---|---|---|
| committer | Richard Kuo <rkuo@codeaurora.org> | 2013-05-01 04:40:28 +0400 |
| commit | 5e1150542fd1d75fe2b6c3491415c860cdc06be2 (patch) | |
| tree | 04b129c2eb46c1d370c7647eb307465bffec45dd /arch/hexagon/kernel | |
| parent | c710f5908768e18d8e8081e917fda362089cb13f (diff) | |
| download | linux-5e1150542fd1d75fe2b6c3491415c860cdc06be2.tar.xz | |
Hexagon: use correct translations for DMA mappings
With physical offsets, pa<->va translations aren't just based
on PAGE_OFFSET anymore.
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Diffstat (limited to 'arch/hexagon/kernel')
| -rw-r--r-- | arch/hexagon/kernel/dma.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c index 65c7bdcf565e..b74f9bae31a3 100644 --- a/arch/hexagon/kernel/dma.c +++ b/arch/hexagon/kernel/dma.c @@ -1,7 +1,7 @@ /* * DMA implementation for Hexagon * - * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * Copyright (c) 2010-2012, The Linux Foundation. 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 @@ -23,12 +23,18 @@ #include <linux/genalloc.h> #include <asm/dma-mapping.h> #include <linux/module.h> +#include <asm/page.h> struct dma_map_ops *dma_ops; EXPORT_SYMBOL(dma_ops); int bad_dma_address; /* globals are automatically initialized to zero */ +static inline void *dma_addr_to_virt(dma_addr_t dma_addr) +{ + return phys_to_virt((unsigned long) dma_addr); +} + int dma_supported(struct device *dev, u64 mask) { if (mask == DMA_BIT_MASK(32)) @@ -60,6 +66,12 @@ static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size, { void *ret; + /* + * Our max_low_pfn should have been backed off by 16MB in + * mm/init.c to create DMA coherent space. Use that as the VA + * for the pool. + */ + if (coherent_pool == NULL) { coherent_pool = gen_pool_create(PAGE_SHIFT, -1); @@ -67,7 +79,7 @@ static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size, panic("Can't create %s() memory pool!", __func__); else gen_pool_add(coherent_pool, - (PAGE_OFFSET + (max_low_pfn << PAGE_SHIFT)), + pfn_to_virt(max_low_pfn), hexagon_coherent_pool_size, -1); } @@ -75,7 +87,7 @@ static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size, if (ret) { memset(ret, 0, size); - *dma_addr = (dma_addr_t) (ret - PAGE_OFFSET); + *dma_addr = (dma_addr_t) virt_to_phys(ret); } else *dma_addr = ~0; @@ -118,8 +130,8 @@ static int hexagon_map_sg(struct device *hwdev, struct scatterlist *sg, s->dma_length = s->length; - flush_dcache_range(PAGE_OFFSET + s->dma_address, - PAGE_OFFSET + s->dma_address + s->length); + flush_dcache_range(dma_addr_to_virt(s->dma_address), + dma_addr_to_virt(s->dma_address + s->length)); } return nents; @@ -149,11 +161,6 @@ static inline void dma_sync(void *addr, size_t size, } } -static inline void *dma_addr_to_virt(dma_addr_t dma_addr) -{ - return phys_to_virt((unsigned long) dma_addr); -} - /** * hexagon_map_page() - maps an address for device DMA * @dev: pointer to DMA device |