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MIPS: improve checks for noncoherent DMA

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Only one MIPS development board actually supports enabling/disabling DMA
coherency at runtime, so it's not a good idea to push the overhead of
checking that configuration setting onto every other supported target as
well.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5912/
This commit is contained in:
Felix Fietkau 2013-09-27 14:41:44 +02:00 committed by Ralf Baechle
parent 5792bf6438
commit 885014bcf2
4 changed files with 16 additions and 5 deletions
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6
arch/mips/Kconfig
View File

@ -301,7 +301,7 @@ config MIPS_MALTA
select CEVT_R4K
select CSRC_R4K
select CSRC_GIC
select DMA_NONCOHERENT
select DMA_MAYBE_COHERENT
select GENERIC_ISA_DMA
select HAVE_PCSPKR_PLATFORM
select IRQ_CPU
@ -893,6 +893,10 @@ config FW_CFE
config ARCH_DMA_ADDR_T_64BIT
def_bool (HIGHMEM && 64BIT_PHYS_ADDR) || 64BIT
config DMA_MAYBE_COHERENT
select DMA_NONCOHERENT
bool
config DMA_COHERENT
bool

9
arch/mips/include/asm/dma-coherence.h
View File

@ -9,7 +9,16 @@
#ifndef __ASM_DMA_COHERENCE_H
#define __ASM_DMA_COHERENCE_H
#ifdef CONFIG_DMA_MAYBE_COHERENT
extern int coherentio;
extern int hw_coherentio;
#else
#ifdef CONFIG_DMA_COHERENT
#define coherentio 1
#else
#define coherentio 0
#endif
#define hw_coherentio 0
#endif /* CONFIG_DMA_MAYBE_COHERENT */
#endif

4
arch/mips/include/asm/mach-generic/dma-coherence.h
View File

@ -49,11 +49,7 @@ static inline int plat_dma_supported(struct device *dev, u64 mask)
static inline int plat_device_is_coherent(struct device *dev)
{
#ifdef CONFIG_DMA_COHERENT
return 1;
#else
return coherentio;
#endif
}
#ifdef CONFIG_SWIOTLB

2
arch/mips/mm/dma-default.c
View File

@ -23,6 +23,7 @@
#include <dma-coherence.h>
#ifdef CONFIG_DMA_MAYBE_COHERENT
int coherentio = 0; /* User defined DMA coherency from command line. */
EXPORT_SYMBOL_GPL(coherentio);
int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
@ -42,6 +43,7 @@ static int __init setnocoherentio(char *str)
return 0;
}
early_param("nocoherentio", setnocoherentio);
#endif
static inline struct page *dma_addr_to_page(struct device *dev,
dma_addr_t dma_addr)