// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2020-2022 Loongson Technology Corporation Limited */ #include <linux/acpi.h> #include <linux/dma-direct.h> 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); } }