From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/loongarch/kernel/dma.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 arch/loongarch/kernel/dma.c (limited to 'arch/loongarch/kernel/dma.c') diff --git a/arch/loongarch/kernel/dma.c b/arch/loongarch/kernel/dma.c new file mode 100644 index 000000000..7a9c6a9dd --- /dev/null +++ b/arch/loongarch/kernel/dma.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + */ +#include +#include + +void acpi_arch_dma_setup(struct device *dev) +{ + int ret; + u64 mask, end = 0; + const struct bus_dma_region *map = NULL; + + ret = acpi_dma_get_range(dev, &map); + if (!ret && map) { + const struct bus_dma_region *r = map; + + for (end = 0; r->size; r++) { + if (r->dma_start + r->size - 1 > end) + end = r->dma_start + r->size - 1; + } + + mask = DMA_BIT_MASK(ilog2(end) + 1); + dev->bus_dma_limit = end; + dev->dma_range_map = map; + dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); + *dev->dma_mask = min(*dev->dma_mask, mask); + } + +} -- cgit v1.2.3