src/soc/intel/xeon_sp/skx/ioapic.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <arch/ioapic.h>
   4 #include <device/pci.h>
   5 #include <device/pci_ids.h>
   6 #include <soc/acpi.h>
   7 #include <soc/pci_devs.h>
   8 #include <soc/ramstage.h>
   9 #include <soc/chip_common.h>
  10
  11 static void ioapic_read_resources(struct device *dev)
  12 {
  13         pci_dev_read_resources(dev);
  14
  15         u16 abar = pci_read_config16(dev, APIC_ABAR);
  16         if (!abar)
  17                 return;
  18         const u32 addr = IO_APIC_ADDR | ((abar & 0xfff) << 8);
  19
  20         printk(BIOS_DEBUG, " %s: IOAPIC Address: 0x%x\n",
  21                dev_path(dev), addr);
  22
  23         mmio_range(dev, APIC_ABAR, addr, 0x100);
  24 }
  25
  26 static void ioapic_init(struct device *dev)
  27 {
  28         struct resource *resource;
  29
  30         pci_dev_init(dev);
  31
  32         /* See if there is a resource with the appropriate index. */
  33         resource = probe_resource(dev, APIC_ABAR);
  34         if (!resource)
  35                 return;
  36
  37         const union xeon_domain_path dn = {
  38                 .domain_path = dev_get_domain_id(dev)
  39         };
  40
  41         /* 14nm Xeon-SP has up to 6 stacks per socket */
  42         assert(dn.stack < MAX_LOGIC_IIO_STACK);
  43
  44         /* Assign socket specific GSI_BASE */
  45         const u32 gsi_base = 24 + (dn.socket * MAX_LOGIC_IIO_STACK + dn.stack) * 8;
  46
  47         ioapic_create_dev(dev, resource->base, gsi_base);
  48 }
  49
  50 static const unsigned short ioapic_ids[] = {
  51         0x2036,
  52         0x2026,
  53         0
  54 };
  55
  56 static struct device_operations ioapic_ops = {
  57         .read_resources   = ioapic_read_resources,
  58         .set_resources    = pci_dev_set_resources,
  59         .enable_resources = pci_dev_enable_resources,
  60         .init             = ioapic_init,
  61 };
  62
  63 static const struct pci_driver ioapic_driver __pci_driver = {
  64         .ops = &ioapic_ops,
  65         .vendor = PCI_VID_INTEL,
  66         .devices = ioapic_ids,
  67 };