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authorRichard Kuo <rkuo@codeaurora.org>2013-04-08 18:30:12 -0500
committerRichard Kuo <rkuo@codeaurora.org>2013-04-30 19:40:28 -0500
commit5e1150542fd1d75fe2b6c3491415c860cdc06be2 (patch)
tree04b129c2eb46c1d370c7647eb307465bffec45dd /arch/hexagon/kernel/dma.c
parentHexagon: fix return value for notify_resume case in do_work_pending (diff)
downloadlinux-dev-5e1150542fd1d75fe2b6c3491415c860cdc06be2.tar.xz
linux-dev-5e1150542fd1d75fe2b6c3491415c860cdc06be2.zip
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 '')
-rw-r--r--arch/hexagon/kernel/dma.c27
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