finalize.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <bootstate.h>
#include <commonlib/console/post_codes.h>
#include <console/console.h>
#include <device/pci_ops.h>
#include <soc/pch.h>
#include <soc/pci_devs.h>
#include <soc/systemagent.h>
 
/*
 * 16.6 System Agent Configuration Locking
 * "5th Generation Intel Core Processor Family BIOS Specification"
 * Document Number 535094
 * Revision 2.2.0, August 2014
 *
 * To ease reading, first lock PCI registers, then MCHBAR registers.
 * Write the MC Lock register first, since more than one bit gets set.
 */
static void broadwell_systemagent_finalize(void)
{
        struct device *const host_bridge = pcidev_path_on_root(SA_DEVFN_ROOT);
 
        pci_or_config16(host_bridge, GGC,         1 << 0);
        pci_or_config32(host_bridge, DPR,         1 << 0);
        pci_or_config32(host_bridge, MESEG_LIMIT, 1 << 10);
        pci_or_config32(host_bridge, REMAPBASE,   1 << 0);
        pci_or_config32(host_bridge, REMAPLIMIT,  1 << 0);
        pci_or_config32(host_bridge, TOM,         1 << 0);
        pci_or_config32(host_bridge, TOUUD,       1 << 0);
        pci_or_config32(host_bridge, BDSM,        1 << 0);
        pci_or_config32(host_bridge, BGSM,        1 << 0);
        pci_or_config32(host_bridge, TSEG,        1 << 0);
        pci_or_config32(host_bridge, TOLUD,       1 << 0);
 
        mchbar_setbits32(0x50fc, 0x8f);         /* MC */
        mchbar_setbits32(0x5500, 1 << 0);       /* PAVP */
        mchbar_setbits32(0x5880, 1 << 5);       /* DDR PTM */
        mchbar_setbits32(0x7000, 1 << 31);
        mchbar_setbits32(0x77fc, 1 << 0);
        mchbar_setbits32(0x7ffc, 1 << 0);
        mchbar_setbits32(0x6800, 1 << 31);
        mchbar_setbits32(0x6020, 1 << 0);               /* UMA GFX */
        mchbar_setbits32(0x63fc, 1 << 0);               /* VTDTRK */
 
        /* Read+write the following */
        mchbar_setbits32(0x6030, 0);
        mchbar_setbits32(0x6034, 0);
        mchbar_setbits32(0x6008, 0);
}
 
static void broadwell_finalize(void *unused)
{
        printk(BIOS_DEBUG, "Finalizing chipset.\n");
 
        broadwell_systemagent_finalize();
 
        broadwell_pch_finalize();
 
        /* Indicate finalize step with post code */
        post_code(POST_OS_BOOT);
}
 
BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, broadwell_finalize, NULL);
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, broadwell_finalize, NULL);