diff options
| author | Jiaxun Yang <jiaxun.yang@flygoat.com> | 2019-10-20 23:01:36 +0800 |
|---|---|---|
| committer | Paul Burton <paulburton@kernel.org> | 2019-11-01 14:31:28 -0700 |
| commit | 6fbde6b492dfc761ad60a68fb2cb32b1eb05b786 (patch) | |
| tree | 34036144cad92b8209ca0e35e79b48c32b797271 /arch/mips/loongson64/dma.c | |
| parent | 1bdb7b76705a38936e9875950587ea91c9ec0a98 (diff) | |
| download | linux-6fbde6b492dfc761ad60a68fb2cb32b1eb05b786.tar.bz2 | |
MIPS: Loongson64: Move files to the top-level directory
Current Loongson-3 code can share among all Loongson64 processors.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: chenhc@lemote.com
Cc: paul.burton@mips.com
Diffstat (limited to 'arch/mips/loongson64/dma.c')
| -rw-r--r-- | arch/mips/loongson64/dma.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/mips/loongson64/dma.c b/arch/mips/loongson64/dma.c new file mode 100644 index 000000000000..5e86635f71db --- /dev/null +++ b/arch/mips/loongson64/dma.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/dma-direct.h> +#include <linux/init.h> +#include <linux/swiotlb.h> + +dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + /* 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 */ + long nid = (paddr >> 44) & 0x3; + return ((nid << 44) ^ paddr) | (nid << 37); +} + +phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr) +{ + /* 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 */ + long nid = (daddr >> 37) & 0x3; + return ((nid << 37) ^ daddr) | (nid << 44); +} + +void __init plat_swiotlb_setup(void) +{ + swiotlb_init(1); +} |