77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
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*/
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#include <common.h>
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#include <dm.h>
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#include <iommu.h>
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#include <lmb.h>
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#include <asm/io.h>
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#include <linux/sizes.h>
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#define IOMMU_PAGE_SIZE SZ_4K
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struct sandbox_iommu_priv {
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struct lmb lmb;
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};
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static dma_addr_t sandbox_iommu_map(struct udevice *dev, void *addr,
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size_t size)
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{
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struct sandbox_iommu_priv *priv = dev_get_priv(dev);
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phys_addr_t paddr, dva;
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phys_size_t psize, off;
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paddr = ALIGN_DOWN(virt_to_phys(addr), IOMMU_PAGE_SIZE);
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off = virt_to_phys(addr) - paddr;
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psize = ALIGN(size + off, IOMMU_PAGE_SIZE);
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dva = lmb_alloc(&priv->lmb, psize, IOMMU_PAGE_SIZE);
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return dva + off;
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}
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static void sandbox_iommu_unmap(struct udevice *dev, dma_addr_t addr,
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size_t size)
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{
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struct sandbox_iommu_priv *priv = dev_get_priv(dev);
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phys_addr_t dva;
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phys_size_t psize;
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dva = ALIGN_DOWN(addr, IOMMU_PAGE_SIZE);
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psize = size + (addr - dva);
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psize = ALIGN(psize, IOMMU_PAGE_SIZE);
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lmb_free(&priv->lmb, dva, psize);
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}
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static struct iommu_ops sandbox_iommu_ops = {
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.map = sandbox_iommu_map,
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.unmap = sandbox_iommu_unmap,
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};
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static int sandbox_iommu_probe(struct udevice *dev)
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{
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struct sandbox_iommu_priv *priv = dev_get_priv(dev);
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lmb_init(&priv->lmb);
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lmb_add(&priv->lmb, 0x89abc000, SZ_16K);
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return 0;
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}
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static const struct udevice_id sandbox_iommu_ids[] = {
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{ .compatible = "sandbox,iommu" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(sandbox_iommu) = {
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.name = "sandbox_iommu",
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.id = UCLASS_IOMMU,
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.of_match = sandbox_iommu_ids,
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.priv_auto = sizeof(struct sandbox_iommu_priv),
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.ops = &sandbox_iommu_ops,
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.probe = sandbox_iommu_probe,
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};
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