From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/mips/loongson64/dma.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 arch/mips/loongson64/dma.c (limited to 'arch/mips/loongson64/dma.c') diff --git a/arch/mips/loongson64/dma.c b/arch/mips/loongson64/dma.c new file mode 100644 index 0000000000..8220a1bc0d --- /dev/null +++ b/arch/mips/loongson64/dma.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include + +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 << node_id_offset); +} + +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 >> node_id_offset) & 0x3; + + return ((nid << node_id_offset) ^ daddr) | (nid << 44); +} + +void __init plat_swiotlb_setup(void) +{ + swiotlb_init(true, SWIOTLB_VERBOSE); +} -- cgit v1.2.3