1 files changed, 54 insertions, 0 deletions
diff --git a/src/soc/intel/pantherlake/lockdown.c b/src/soc/intel/pantherlake/lockdown.c
new file mode 100644
index 0000000000..2994952d00
--- /dev/null
+++ b/src/soc/intel/pantherlake/lockdown.c
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/mmio.h>
+#include <intelblocks/cfg.h>
+#include <intelblocks/pcr.h>
+#include <intelblocks/pmclib.h>
+#include <intelpch/lockdown.h>
+#include <soc/pcr_ids.h>
+#include <soc/pm.h>
+#include <stdint.h>
+
+/* PCR PSTH Control Register */
+#define PCR_PSTH_CTRLREG	0x1d00
+#define  PSTH_CTRLREG_IOSFPTCGE	BIT(2)
+
+static void pmc_lockdown_cfg(int chipset_lockdown)
+{
+	uint8_t *pmcbase = pmc_mmio_regs();
+
+	/* PMSYNC */
+	setbits32(pmcbase + PMSYNC_TPR_CFG, PCH2CPU_TPR_CFG_LOCK);
+	/* Lock down ABASE and sleep stretching policy */
+	setbits32(pmcbase + GEN_PMCON_B, SLP_STR_POL_LOCK | ACPI_BASE_LOCK);
+
+	if (chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT)
+		setbits32(pmcbase + GEN_PMCON_B, SMI_LOCK);
+
+	if (!CONFIG(USE_FSP_NOTIFY_PHASE_POST_PCI_ENUM)) {
+		setbits32(pmcbase + GEN_PMCON_B, ST_FDIS_LOCK);
+		setbits32(pmcbase + SSML, SSML_SSL_EN);
+		setbits32(pmcbase + PM_CFG, PM_CFG_DBG_MODE_LOCK |
+					 PM_CFG_XRAM_READ_DISABLE);
+	}
+
+	/* Send PMC IPC to inform about both BIOS Reset and PCI enumeration done */
+	pmc_send_bios_reset_pci_enum_done();
+}
+
+static void soc_die_lockdown_cfg(void)
+{
+	if (CONFIG(USE_FSP_NOTIFY_PHASE_POST_PCI_ENUM))
+		return;
+
+	/* Enable IOSF Primary Trunk Clock Gating */
+	pcr_rmw32(PID_PSTH, PCR_PSTH_CTRLREG, ~0, PSTH_CTRLREG_IOSFPTCGE);
+}
+
+void soc_lockdown_config(int chipset_lockdown)
+{
+	/* PMC lock down configuration */
+	pmc_lockdown_cfg(chipset_lockdown);
+	/* SOC Die lock down configuration */
+	soc_die_lockdown_cfg();
+}