src/northbridge/intel/gm45/acpi.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <types.h>
   4 #include <commonlib/helpers.h>
   5 #include <console/console.h>
   6 #include <acpi/acpi.h>
   7 #include <acpi/acpigen.h>
   8 #include <device/device.h>
   9 #include <device/pci_def.h>
  10 #include <device/pci_ops.h>
  11
  12 #include "gm45.h"
  13
  14 static unsigned long acpi_fill_dmar(unsigned long current)
  15 {
  16         const struct device *dev;
  17
  18         dev = pcidev_on_root(3, 0);
  19         int me_active = dev && dev->enabled;
  20
  21         dev = pcidev_on_root(2, 0);
  22         int igd_active = dev && dev->enabled;
  23
  24         int stepping = pci_read_config8(pcidev_on_root(0, 0),
  25                                                            PCI_CLASS_REVISION);
  26
  27         unsigned long tmp = current;
  28         current += acpi_create_dmar_drhd_4k(current, 0, 0, IOMMU_BASE1);
  29         current += acpi_create_dmar_ds_pci(current, 0, 0x1b, 0);
  30         acpi_dmar_drhd_fixup(tmp, current);
  31
  32         if (stepping != STEPPING_B2 && igd_active) {
  33                 tmp = current;
  34                 current += acpi_create_dmar_drhd_4k(current, 0, 0, IOMMU_BASE2);
  35                 current += acpi_create_dmar_ds_pci(current, 0, 0x2, 0);
  36                 current += acpi_create_dmar_ds_pci(current, 0, 0x2, 1);
  37                 acpi_dmar_drhd_fixup(tmp, current);
  38         }
  39
  40         if (me_active) {
  41                 tmp = current;
  42                 current += acpi_create_dmar_drhd_4k(current, 0, 0, IOMMU_BASE3);
  43                 current += acpi_create_dmar_ds_pci(current, 0, 0x3, 0);
  44                 current += acpi_create_dmar_ds_pci(current, 0, 0x3, 1);
  45                 current += acpi_create_dmar_ds_pci(current, 0, 0x3, 2);
  46                 current += acpi_create_dmar_ds_pci(current, 0, 0x3, 3);
  47                 acpi_dmar_drhd_fixup(tmp, current);
  48         }
  49
  50         current += acpi_create_dmar_drhd_4k(current, DRHD_INCLUDE_PCI_ALL, 0, IOMMU_BASE4);
  51
  52         /* TODO: reserve GTT for 0.2.0 and 0.2.1? */
  53         return current;
  54 }
  55
  56 unsigned long northbridge_write_acpi_tables(const struct device *device,
  57                                             unsigned long start,
  58                                             struct acpi_rsdp *rsdp)
  59 {
  60         unsigned long current;
  61         acpi_dmar_t *dmar;
  62
  63         current = start;
  64
  65         printk(BIOS_DEBUG, "ACPI:     * DMAR\n");
  66         dmar = (acpi_dmar_t *)current;
  67         acpi_create_dmar(dmar, 0, acpi_fill_dmar);
  68         current += dmar->header.length;
  69         current = acpi_align_current(current);
  70         acpi_add_table(rsdp, dmar);
  71
  72         current = acpi_align_current(current);
  73
  74         printk(BIOS_DEBUG, "current = %lx\n", current);
  75
  76         return current;
  77 }