src/soc/intel/cannonlake/lockdown.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <device/mmio.h>
  16 #include <intelblocks/cfg.h>
  17 #include <intelblocks/pmclib.h>
  18 #include <intelpch/lockdown.h>
  19 #include <soc/pm.h>
  20
  21 static void pmc_lock_pmsync(void)
  22 {
  23         uint8_t *pmcbase;
  24         uint32_t pmsyncreg;
  25
  26         pmcbase = pmc_mmio_regs();
  27
  28         pmsyncreg = read32(pmcbase + PMSYNC_TPR_CFG);
  29         pmsyncreg |= PCH2CPU_TPR_CFG_LOCK;
  30         write32(pmcbase + PMSYNC_TPR_CFG, pmsyncreg);
  31 }
  32
  33 static void pmc_lock_abase(void)
  34 {
  35         uint8_t *pmcbase;
  36         uint32_t reg32;
  37
  38         pmcbase = pmc_mmio_regs();
  39
  40         reg32 = read32(pmcbase + GEN_PMCON_B);
  41         reg32 |= (SLP_STR_POL_LOCK | ACPI_BASE_LOCK);
  42         write32(pmcbase + GEN_PMCON_B, reg32);
  43 }
  44
  45 static void pmc_lock_smi(void)
  46 {
  47         uint8_t *pmcbase;
  48         uint8_t reg8;
  49
  50         pmcbase = pmc_mmio_regs();
  51
  52         reg8 = read8(pmcbase + GEN_PMCON_B);
  53         reg8 |= SMI_LOCK;
  54         write8(pmcbase + GEN_PMCON_B, reg8);
  55 }
  56
  57 static void pmc_lockdown_cfg(int chipset_lockdown)
  58 {
  59         /* PMSYNC */
  60         pmc_lock_pmsync();
  61         /* Lock down ABASE and sleep stretching policy */
  62         pmc_lock_abase();
  63         /* Make sure payload/OS can't trigger global reset */
  64         pmc_global_reset_disable_and_lock();
  65
  66         if (chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT)
  67                 pmc_lock_smi();
  68 }
  69
  70 void soc_lockdown_config(int chipset_lockdown)
  71 {
  72         /* PMC lock down configuration */
  73         pmc_lockdown_cfg(chipset_lockdown);
  74 }