src/soc/intel/meteorlake/p2sb.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <device/device.h>
   5 #include <device/pci_def.h>
   6 #include <intelblocks/p2sb.h>
   7 #include <soc/iomap.h>
   8
   9 void p2sb_soc_get_sb_mask(uint32_t *ep_mask, size_t count)
  10 {
  11         uint32_t mask;
  12
  13         if (count != P2SB_EP_MASK_MAX_REG) {
  14                 printk(BIOS_ERR, "Unable to program EPMASK registers\n");
  15                 return;
  16         }
  17
  18         /* Remove the host accessing right to PSF register range.
  19          * Set p2sb PCI offset EPMASK5 [29, 28, 27, 26] to disable Sideband
  20          * access for PCI Root Bridge.
  21          */
  22         mask = (1 << 29) | (1 << 28) | (1 << 27)  | (1 << 26);
  23
  24         ep_mask[P2SB_EP_MASK_5_REG] = mask;
  25
  26         /*
  27          * Set p2sb PCI offset EPMASK7 [31, 30] to disable Sideband
  28          * access for Broadcast and Multicast.
  29          */
  30         mask = (1 << 31) | (1 << 30);
  31
  32         ep_mask[P2SB_EP_MASK_7_REG] = mask;
  33 }
  34
  35 static void ioe_p2sb_read_resources(struct device *dev)
  36 {
  37         /* Add the fixed MMIO resource for IOE P2SB */
  38         mmio_range(dev, PCI_BASE_ADDRESS_0, IOE_P2SB_BAR, IOE_P2SB_SIZE);
  39 }
  40
  41 static void p2sb_read_resources(struct device *dev)
  42 {
  43         /*
  44          * There's only one resource on the P2SB device. It's also already
  45          * manually set to a fixed address in earlier boot stages.
  46          * The following code makes sure that it doesn't change even the
  47          * resource allocator is being run.
  48          */
  49         mmio_range(dev, PCI_BASE_ADDRESS_0, P2SB_BAR, P2SB_SIZE);
  50 }
  51
  52 struct device_operations ioe_p2sb_ops = {
  53         .read_resources   = ioe_p2sb_read_resources,
  54         .set_resources    = noop_set_resources,
  55         .scan_bus         = scan_static_bus,
  56 };
  57
  58 struct device_operations soc_p2sb_ops = {
  59         .read_resources   = p2sb_read_resources,
  60         .set_resources    = noop_set_resources,
  61         .scan_bus         = scan_static_bus,
  62 };