src/soc/intel/elkhartlake/p2sb.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <intelblocks/p2sb.h>
   5
   6 void p2sb_soc_get_sb_mask(uint32_t *ep_mask, size_t count)
   7 {
   8         uint32_t mask;
   9
  10         if (count != P2SB_EP_MASK_MAX_REG) {
  11                 printk(BIOS_ERR, "Unable to program EPMASK registers\n");
  12                 return;
  13         }
  14
  15         /* Remove the host accessing right to PSF register range.
  16          * Set p2sb PCI offset EPMASK5 [29, 28, 27, 26] to disable sideband
  17          * access for PCI Root Bridge.
  18          */
  19         mask = (1 << 29) | (1 << 28) | (1 << 27)  | (1 << 26);
  20
  21         ep_mask[P2SB_EP_MASK_5_REG] = mask;
  22
  23         /*
  24          * Set p2sb PCI offset EPMASK7 [31, 30] to disable Sideband
  25          * access for Broadcast and Multicast.
  26          */
  27         mask = (1 << 31) | (1 << 30);
  28
  29         ep_mask[P2SB_EP_MASK_7_REG] = mask;
  30 }