src/northbridge/amd/agesa/family15tn/iommu.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2013 Rudolf Marek <r.marek@assembler.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <device/device.h>
  17 #include <device/pci.h>
  18 #include <device/pci_ids.h>
  19 #include <device/pci_ops.h>
  20 #include <lib.h>
  21
  22 static void iommu_read_resources(device_t dev)
  23 {
  24         struct resource *res;
  25
  26         /* Get the normal pci resources of this device */
  27         pci_dev_read_resources(dev);
  28
  29         /* Add an extra subtractive resource for both memory and I/O. */
  30         res = new_resource(dev, 0x44);
  31         res->size = 512 * 1024;
  32         res->align = log2(res->size);
  33         res->gran = log2(res->size);
  34         res->limit = 0xffffffff;        /* 4G */
  35         res->flags = IORESOURCE_MEM;
  36 }
  37
  38 static void iommu_set_resources(device_t dev)
  39 {
  40         struct resource *res;
  41
  42         pci_dev_set_resources(dev);
  43
  44         res = find_resource(dev, 0x44);
  45         /* Remember this resource has been stored */
  46         res->flags |= IORESOURCE_STORED;
  47         /* For now, do only 32-bit space allocation */
  48         pci_write_config32(dev, 0x48, 0x0);
  49         pci_write_config32(dev, 0x44, res->base | (1 << 0));
  50 }
  51
  52 static struct pci_operations lops_pci = {
  53         .set_subsystem = pci_dev_set_subsystem,
  54 };
  55
  56 static struct device_operations iommu_ops = {
  57         .read_resources = iommu_read_resources,
  58         .set_resources = iommu_set_resources,
  59         .enable_resources = pci_dev_enable_resources,
  60         .init = 0,
  61         .scan_bus = 0,
  62         .ops_pci = &lops_pci,
  63 };
  64
  65 static const struct pci_driver iommu_driver __pci_driver = {
  66         .ops = &iommu_ops,
  67         .vendor = PCI_VENDOR_ID_AMD,
  68         .device = PCI_DEVICE_ID_AMD_15H_NB_IOMMU,
  69 };