diff options
Diffstat (limited to 'arch/mips/loongson')
| -rw-r--r-- | arch/mips/loongson/Kconfig | 5 | ||||
| -rw-r--r-- | arch/mips/loongson/common/dma-swiotlb.c | 14 |
2 files changed, 19 insertions, 0 deletions
diff --git a/arch/mips/loongson/Kconfig b/arch/mips/loongson/Kconfig index 1b91fc6a921..72f830ac078 100644 --- a/arch/mips/loongson/Kconfig +++ b/arch/mips/loongson/Kconfig @@ -86,6 +86,7 @@ config LOONGSON_MACH3X select LOONGSON_MC146818 select ZONE_DMA32 select LEFI_FIRMWARE_INTERFACE + select PHYS48_TO_HT40 help Generic Loongson 3 family machines utilize the 3A/3B revision of Loongson processor and RS780/SBX00 chipset. @@ -131,6 +132,10 @@ config SWIOTLB select NEED_SG_DMA_LENGTH select NEED_DMA_MAP_STATE +config PHYS48_TO_HT40 + bool + default y if CPU_LOONGSON3 + config LOONGSON_MC146818 bool default n diff --git a/arch/mips/loongson/common/dma-swiotlb.c b/arch/mips/loongson/common/dma-swiotlb.c index c2be01f9157..2c6b989c1bc 100644 --- a/arch/mips/loongson/common/dma-swiotlb.c +++ b/arch/mips/loongson/common/dma-swiotlb.c @@ -105,11 +105,25 @@ static int loongson_dma_set_mask(struct device *dev, u64 mask) dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { + long nid; +#ifdef CONFIG_PHYS48_TO_HT40 + /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from + * Loongson-3's 48bit address space and embed it into 40bit */ + nid = (paddr >> 44) & 0x3; + paddr = ((nid << 44) ^ paddr) | (nid << 37); +#endif return paddr; } phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) { + long nid; +#ifdef CONFIG_PHYS48_TO_HT40 + /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from + * Loongson-3's 48bit address space and embed it into 40bit */ + nid = (daddr >> 37) & 0x3; + daddr = ((nid << 37) ^ daddr) | (nid << 44); +#endif return daddr; } |