p2sb.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
/*
 * This file is created based on Intel Alder Lake Processor PCH Datasheet
 * Document number: 621483
 * Chapter number: 3
 */
 
#include <console/console.h>
#include <intelblocks/p2sb.h>
 
void p2sb_soc_get_sb_mask(uint32_t *ep_mask, size_t count)
{
        uint32_t mask;
 
        if (count != P2SB_EP_MASK_MAX_REG) {
                printk(BIOS_ERR, "Unable to program EPMASK registers\n");
                return;
        }
 
        /* Remove the host accessing right to PSF register range.
         * Set p2sb PCI offset EPMASK5 [29, 28, 27, 26] to disable Sideband
         * access for PCI Root Bridge.
         */
        mask = (1 << 29) | (1 << 28) | (1 << 27)  | (1 << 26);
 
        ep_mask[P2SB_EP_MASK_5_REG] = mask;
 
        /*
         * Set p2sb PCI offset EPMASK7 [31, 30] to disable Sideband
         * access for Broadcast and Multicast.
         */
        mask = (1 << 31) | (1 << 30);
 
        ep_mask[P2SB_EP_MASK_7_REG] = mask;
}