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30 lines
709 B
30 lines
709 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/dma-direct.h> |
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void acpi_arch_dma_setup(struct device *dev) |
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{ |
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int ret; |
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u64 mask, end = 0; |
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const struct bus_dma_region *map = NULL; |
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ret = acpi_dma_get_range(dev, &map); |
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if (!ret && map) { |
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const struct bus_dma_region *r = map; |
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for (end = 0; r->size; r++) { |
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if (r->dma_start + r->size - 1 > end) |
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end = r->dma_start + r->size - 1; |
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} |
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mask = DMA_BIT_MASK(ilog2(end) + 1); |
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dev->bus_dma_limit = end; |
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dev->dma_range_map = map; |
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dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); |
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*dev->dma_mask = min(*dev->dma_mask, mask); |
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} |
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}
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