iommu.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <lib.h>
 
static void iommu_read_resources(struct device *dev)
{
        struct resource *res;
 
        /* Get the normal pci resources of this device */
        pci_dev_read_resources(dev);
 
        /* IOMMU MMIO registers */
        res = new_resource(dev, 0x44);
        res->size = 512 * 1024;
        res->align = log2(res->size);
        res->gran = log2(res->size);
        res->limit = 0xffffffff;        /* 4G */
        res->flags = IORESOURCE_MEM;
}
 
static void iommu_set_resources(struct device *dev)
{
        struct resource *res;
 
        pci_dev_set_resources(dev);
 
        res = find_resource(dev, 0x44);
        /* Remember this resource has been stored */
        res->flags |= IORESOURCE_STORED;
        /* For now, do only 32-bit space allocation */
        pci_write_config32(dev, 0x48, 0x0);
        pci_write_config32(dev, 0x44, res->base | (1 << 0));
}
 
static struct device_operations iommu_ops = {
        .read_resources = iommu_read_resources,
        .set_resources = iommu_set_resources,
        .enable_resources = pci_dev_enable_resources,
        .ops_pci = &pci_dev_ops_pci,
};
 
static const struct pci_driver iommu_driver __pci_driver = {
        .ops = &iommu_ops,
        .vendor = PCI_VID_AMD,
        .device = PCI_DID_AMD_15H_MODEL_101F_NB_IOMMU,
};