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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
*/
#define LOG_CATEGORY UCLASS_IOMMU
#include <common.h>
#include <dm.h>
#include <iommu.h>
#include <malloc.h>
#include <phys2bus.h>
#include <asm/io.h>
#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA))
#if CONFIG_IS_ENABLED(PCI)
static int dev_pci_iommu_enable(struct udevice *dev)
{
struct udevice *parent = dev->parent;
struct udevice *dev_iommu;
u32 *iommu_map;
u32 iommu_map_mask, length, phandle, rid, rid_base;
int i, count, len, ret;
while (parent) {
len = dev_read_size(parent, "iommu-map");
if (len > 0)
break;
parent = parent->parent;
}
if (len <= 0)
return 0;
iommu_map = malloc(len);
if (!iommu_map)
return -ENOMEM;
count = len / sizeof(u32);
ret = dev_read_u32_array(parent, "iommu-map", iommu_map, count);
if (ret < 0) {
free(iommu_map);
return 0;
}
iommu_map_mask = dev_read_u32_default(parent, "iommu-map-mask", ~0);
rid = (dm_pci_get_bdf(dev) >> 8) & iommu_map_mask;
/* Loop over entries until mapping is found. */
for (i = 0; i < count; i += 4) {
rid_base = iommu_map[i];
phandle = iommu_map[i + 1];
length = iommu_map[i + 3];
if (rid < rid_base || rid >= rid_base + length)
continue;
ret = uclass_get_device_by_phandle_id(UCLASS_IOMMU, phandle,
&dev_iommu);
if (ret) {
debug("%s: uclass_get_device_by_ofnode failed: %d\n",
__func__, ret);
free(iommu_map);
return ret;
}
dev->iommu = dev_iommu;
break;
}
free(iommu_map);
return 0;
}
#endif
int dev_iommu_enable(struct udevice *dev)
{
struct ofnode_phandle_args args;
struct udevice *dev_iommu;
const struct iommu_ops *ops;
int i, count, ret = 0;
count = dev_count_phandle_with_args(dev, "iommus",
"#iommu-cells", 0);
for (i = 0; i < count; i++) {
ret = dev_read_phandle_with_args(dev, "iommus",
"#iommu-cells", 0, i, &args);
if (ret) {
log_err("%s: Failed to parse 'iommus' property for '%s': %d\n",
__func__, dev->name, ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_IOMMU, args.node,
&dev_iommu);
if (ret) {
log_err("%s: Failed to find IOMMU device for '%s': %d\n",
__func__, dev->name, ret);
return ret;
}
dev->iommu = dev_iommu;
if (dev->parent && dev->parent->iommu == dev_iommu)
continue;
ops = device_get_ops(dev->iommu);
if (ops && ops->connect) {
ret = ops->connect(dev);
if (ret) {
log_err("%s: Failed to connect '%s' to IOMMU '%s': %d\n",
__func__, dev->name, dev->iommu->name, ret);
return ret;
}
}
}
#if CONFIG_IS_ENABLED(PCI)
if (count < 0 && device_is_on_pci_bus(dev))
return dev_pci_iommu_enable(dev);
#endif
return 0;
}
#endif
dma_addr_t dev_iommu_dma_map(struct udevice *dev, void *addr, size_t size)
{
const struct iommu_ops *ops;
if (dev->iommu) {
ops = device_get_ops(dev->iommu);
if (ops && ops->map)
return ops->map(dev->iommu, addr, size);
}
return dev_phys_to_bus(dev, virt_to_phys(addr));
}
void dev_iommu_dma_unmap(struct udevice *dev, dma_addr_t addr, size_t size)
{
const struct iommu_ops *ops;
if (dev->iommu) {
ops = device_get_ops(dev->iommu);
if (ops && ops->unmap)
ops->unmap(dev->iommu, addr, size);
}
}
UCLASS_DRIVER(iommu) = {
.id = UCLASS_IOMMU,
.name = "iommu",
};
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