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50 lines
1.4 KiB
50 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/acpi.h> |
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#include <linux/acpi_iort.h> |
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#include <linux/device.h> |
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#include <linux/dma-direct.h> |
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void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) |
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{ |
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int ret; |
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u64 end, mask; |
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u64 dmaaddr = 0, size = 0, offset = 0; |
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/* |
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* If @dev is expected to be DMA-capable then the bus code that created |
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* it should have initialised its dma_mask pointer by this point. For |
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* now, we'll continue the legacy behaviour of coercing it to the |
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* coherent mask if not, but we'll no longer do so quietly. |
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*/ |
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if (!dev->dma_mask) { |
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dev_warn(dev, "DMA mask not set\n"); |
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dev->dma_mask = &dev->coherent_dma_mask; |
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} |
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if (dev->coherent_dma_mask) |
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size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); |
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else |
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size = 1ULL << 32; |
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ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size); |
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if (ret == -ENODEV) |
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ret = iort_dma_get_ranges(dev, &size); |
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if (!ret) { |
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/* |
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* Limit coherent and dma mask based on size retrieved from |
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* firmware. |
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*/ |
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end = dmaaddr + size - 1; |
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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->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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*dma_addr = dmaaddr; |
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*dma_size = size; |
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ret = dma_direct_set_offset(dev, dmaaddr + offset, dmaaddr, size); |
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dev_dbg(dev, "dma_offset(%#08llx)%s\n", offset, ret ? " failed!" : ""); |
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}
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