openwrtv3/target/linux/oxnas/patches-3.18/010-arm_introduce-dma-fiq-irq-broadcast.patch
John Crispin 72b58f2eb1 add new target 'oxnas'
This is the oxnas target previously developed at
http://gitorious.org/openwrt-oxnas
Basically, this consolidates the changes and addtionas from
http://github.org/kref/linux-oxnas
into a new OpenWrt hardware target 'oxnas' adding support for
 PLX Technology NAS7820/NAS7821/NAS7825/...
formally known as
 Oxford Semiconductor OXE810SE/OXE815/OX820/...

For now there are 4 supported boards:
Cloud Engines Pogoplug V3 (without PCIe)
 fully supported

Cloud Engines Pogoplug Pro (with PCIe)
 fully supported

MitraStar STG-212
 aka ZyXEL NSA-212,
 aka Medion Akoya P89625 / P89636 / P89626 / P89630,
 aka Medion MD 86407 / MD 86805 / MD 86517 / MD 86587
 fully supported, see http://wiki.openwrt.org/toh/medion/md86587

Shuttle KD-20
 partially supported (S-ATA driver lacks support for 2nd port)

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

SVN-Revision: 43388
2014-11-26 09:00:08 +00:00

62 lines
2.3 KiB
Diff

Index: linux-3.18-rc4/arch/arm/include/asm/glue-cache.h
===================================================================
--- linux-3.18-rc4.orig/arch/arm/include/asm/glue-cache.h
+++ linux-3.18-rc4/arch/arm/include/asm/glue-cache.h
@@ -156,11 +156,19 @@ static inline void nop_dma_unmap_area(co
#define __cpuc_flush_user_range __glue(_CACHE,_flush_user_cache_range)
#define __cpuc_coherent_kern_range __glue(_CACHE,_coherent_kern_range)
#define __cpuc_coherent_user_range __glue(_CACHE,_coherent_user_range)
+#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
#define __cpuc_flush_dcache_area __glue(_CACHE,_flush_kern_dcache_area)
#define dmac_map_area __glue(_CACHE,_dma_map_area)
#define dmac_unmap_area __glue(_CACHE,_dma_unmap_area)
#define dmac_flush_range __glue(_CACHE,_dma_flush_range)
+#else
+#define __cpuc_flush_dcache_area __glue(fiq,_flush_kern_dcache_area)
+
+#define dmac_map_area __glue(fiq,_dma_map_area)
+#define dmac_unmap_area __glue(fiq,_dma_unmap_area)
+#define dmac_flush_range __glue(fiq,_dma_flush_range)
+#endif /* CONFIG_DMA_CACHE_FIQ_BROADCAST */
#endif
#endif
Index: linux-3.18-rc4/arch/arm/mm/Kconfig
===================================================================
--- linux-3.18-rc4.orig/arch/arm/mm/Kconfig
+++ linux-3.18-rc4/arch/arm/mm/Kconfig
@@ -843,6 +843,17 @@ config DMA_CACHE_RWFO
in hardware, other workarounds are needed (e.g. cache
maintenance broadcasting in software via FIQ).
+config DMA_CACHE_FIQ_BROADCAST
+ bool "Enable fiq broadcast DMA cache maintenance"
+ depends on CPU_V6K && SMP
+ select FIQ
+ help
+ The Snoop Control Unit on ARM11MPCore does not detect the
+ cache maintenance operations and the dma_{map,unmap}_area()
+ functions may leave stale cache entries on other CPUs. By
+ enabling this option, fiq broadcast in the ARMv6
+ DMA cache maintenance functions is performed.
+
config OUTER_CACHE
bool
Index: linux-3.18-rc4/arch/arm/mm/flush.c
===================================================================
--- linux-3.18-rc4.orig/arch/arm/mm/flush.c
+++ linux-3.18-rc4/arch/arm/mm/flush.c
@@ -314,7 +314,11 @@ void flush_dcache_page(struct page *page
mapping = page_mapping(page);
+#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
if (!cache_ops_need_broadcast() &&
+#else
+ if (
+#endif
mapping && !page_mapped(page))
clear_bit(PG_dcache_clean, &page->flags);
else {