lockdown.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/mmio.h>
#include <device/pci.h>
#include <intelblocks/cfg.h>
#include <intelblocks/pmclib.h>
#include <intelpch/lockdown.h>
#include <soc/pci_devs.h>
#include <soc/pm.h>
 
static void pmc_lockdown_config(int chipset_lockdown)
{
        uint8_t *pmcbase;
        u32 pmsyncreg;
 
        /* PMSYNC */
        pmcbase = pmc_mmio_regs();
        pmsyncreg = read32(pmcbase + PMSYNC_TPR_CFG);
        pmsyncreg |= PMSYNC_LOCK;
        write32(pmcbase + PMSYNC_TPR_CFG, pmsyncreg);
 
        /* Make sure payload/OS can't trigger global reset */
        pmc_global_reset_disable_and_lock();
 
        /* Lock PMC stretch policy */
        pci_or_config32(PCH_DEV_PMC, GEN_PMCON_B, SLP_STR_POL_LOCK);
}
 
static void sata_lockdown_config(int chipset_lockdown)
{
        if (chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT) {
                pci_or_config32(PCH_DEV_SATA, SATAGC, SATAGC_REGLOCK);
                pci_or_config32(PCH_DEV_SSATA, SATAGC, SATAGC_REGLOCK);
        }
}
 
void soc_lockdown_config(int chipset_lockdown)
{
        pmc_lockdown_config(chipset_lockdown);
        sata_lockdown_config(chipset_lockdown);
}