mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 02:08:38 +00:00
49a1a4becb
Test that the map and unmap operations work for devices that have DMA translated by an IOMMU and devices that don't have DMA translated by an IOMMU. Signed-off-by: Mark Kettenis <kettenis@openbsd.org> Reviewed-by: Simon Glass <sjg@chromium.org>
76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <iommu.h>
|
|
#include <lmb.h>
|
|
#include <asm/io.h>
|
|
#include <linux/sizes.h>
|
|
|
|
#define IOMMU_PAGE_SIZE SZ_4K
|
|
|
|
struct sandbox_iommu_priv {
|
|
struct lmb lmb;
|
|
};
|
|
|
|
static dma_addr_t sandbox_iommu_map(struct udevice *dev, void *addr,
|
|
size_t size)
|
|
{
|
|
struct sandbox_iommu_priv *priv = dev_get_priv(dev);
|
|
phys_addr_t paddr, dva;
|
|
phys_size_t psize, off;
|
|
|
|
paddr = ALIGN_DOWN(virt_to_phys(addr), IOMMU_PAGE_SIZE);
|
|
off = virt_to_phys(addr) - paddr;
|
|
psize = ALIGN(size + off, IOMMU_PAGE_SIZE);
|
|
|
|
dva = lmb_alloc(&priv->lmb, psize, IOMMU_PAGE_SIZE);
|
|
|
|
return dva + off;
|
|
}
|
|
|
|
static void sandbox_iommu_unmap(struct udevice *dev, dma_addr_t addr,
|
|
size_t size)
|
|
{
|
|
struct sandbox_iommu_priv *priv = dev_get_priv(dev);
|
|
phys_addr_t dva;
|
|
phys_size_t psize;
|
|
|
|
dva = ALIGN_DOWN(addr, IOMMU_PAGE_SIZE);
|
|
psize = size + (addr - dva);
|
|
psize = ALIGN(psize, IOMMU_PAGE_SIZE);
|
|
|
|
lmb_free(&priv->lmb, dva, psize);
|
|
}
|
|
|
|
static struct iommu_ops sandbox_iommu_ops = {
|
|
.map = sandbox_iommu_map,
|
|
.unmap = sandbox_iommu_unmap,
|
|
};
|
|
|
|
static int sandbox_iommu_probe(struct udevice *dev)
|
|
{
|
|
struct sandbox_iommu_priv *priv = dev_get_priv(dev);
|
|
|
|
lmb_init(&priv->lmb);
|
|
lmb_add(&priv->lmb, 0x89abc000, SZ_16K);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id sandbox_iommu_ids[] = {
|
|
{ .compatible = "sandbox,iommu" },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(sandbox_iommu) = {
|
|
.name = "sandbox_iommu",
|
|
.id = UCLASS_IOMMU,
|
|
.of_match = sandbox_iommu_ids,
|
|
.priv_auto = sizeof(struct sandbox_iommu_priv),
|
|
.ops = &sandbox_iommu_ops,
|
|
.probe = sandbox_iommu_probe,
|
|
};
|