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78 lines
1.7 KiB
78 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Stub IOMMU driver which does nothing. |
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* The main purpose of it being present is to reuse generic IOMMU device tree |
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* bindings by Xen grant DMA-mapping layer. |
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* |
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* Copyright (C) 2022 EPAM Systems Inc. |
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*/ |
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#include <linux/iommu.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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struct grant_dma_iommu_device { |
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struct device *dev; |
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struct iommu_device iommu; |
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}; |
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/* Nothing is really needed here */ |
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static const struct iommu_ops grant_dma_iommu_ops; |
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static const struct of_device_id grant_dma_iommu_of_match[] = { |
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{ .compatible = "xen,grant-dma" }, |
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{ }, |
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}; |
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static int grant_dma_iommu_probe(struct platform_device *pdev) |
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{ |
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struct grant_dma_iommu_device *mmu; |
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int ret; |
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mmu = devm_kzalloc(&pdev->dev, sizeof(*mmu), GFP_KERNEL); |
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if (!mmu) |
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return -ENOMEM; |
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mmu->dev = &pdev->dev; |
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ret = iommu_device_register(&mmu->iommu, &grant_dma_iommu_ops, &pdev->dev); |
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if (ret) |
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return ret; |
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platform_set_drvdata(pdev, mmu); |
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return 0; |
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} |
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static int grant_dma_iommu_remove(struct platform_device *pdev) |
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{ |
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struct grant_dma_iommu_device *mmu = platform_get_drvdata(pdev); |
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platform_set_drvdata(pdev, NULL); |
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iommu_device_unregister(&mmu->iommu); |
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return 0; |
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} |
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static struct platform_driver grant_dma_iommu_driver = { |
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.driver = { |
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.name = "grant-dma-iommu", |
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.of_match_table = grant_dma_iommu_of_match, |
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}, |
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.probe = grant_dma_iommu_probe, |
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.remove = grant_dma_iommu_remove, |
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}; |
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static int __init grant_dma_iommu_init(void) |
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{ |
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struct device_node *iommu_np; |
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iommu_np = of_find_matching_node(NULL, grant_dma_iommu_of_match); |
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if (!iommu_np) |
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return 0; |
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of_node_put(iommu_np); |
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return platform_driver_register(&grant_dma_iommu_driver); |
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} |
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subsys_initcall(grant_dma_iommu_init);
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