soc/intel/meteorlake: Provide access to IOE through P2SB SBI for TCSS

This change provides access to IOE through P2SB Sideband interface for
Meteor Lake TCSS functions of pad configuration and Thunderbolt
authentication. There is a policy of locking the P2SB access at the end
of platform initialization. The tbt_authentication is read from IOM
register through IOE P2SB at early silicon initialization phase and its
usage is deferred to usb4 driver.

BUG=b:213574324
TEST=Built coreboot and validated booting to OS successfully on MTLRVP
board. No boot hung was observed.

Signed-off-by: John Zhao <john.zhao@intel.com>
Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I8dcee90080c6e70dadc011cc1dbef3659fdbc8f7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66951
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/meteorlake/chip.c

@@ -8,16 +8,20 @@
 #include <intelblocks/cfg.h>
 #include <intelblocks/gpio.h>
 #include <intelblocks/itss.h>
+#include <intelblocks/p2sb.h>
 #include <intelblocks/pcie_rp.h>
 #include <intelblocks/systemagent.h>
+#include <intelblocks/tcss.h>
 #include <intelblocks/xdci.h>
 #include <soc/intel/common/vbt.h>
+#include <soc/iomap.h>
 #include <soc/itss.h>
 #include <soc/p2sb.h>
 #include <soc/pci_devs.h>
 #include <soc/pcie.h>
 #include <soc/ramstage.h>
 #include <soc/soc_chip.h>
+#include <soc/tcss.h>
 
 #if CONFIG(HAVE_ACPI_TABLES)
 const char *soc_acpi_name(const struct device *dev)
@@ -129,6 +133,12 @@ static void soc_fill_gpio_pm_configuration(void)
 
 void soc_init_pre_device(void *chip_info)
 {
+	config_t *config = config_of_soc();
+
+	/* Validate TBT image authentication */
+	config->tbt_authentication = ioe_p2sb_sbi_read(PID_IOM,
+					IOM_CSME_IMR_TBT_STATUS) & TBT_VALID_AUTHENTICATION;
+
 	/* Perform silicon specific init. */
 	fsp_silicon_init();
 

src/soc/intel/meteorlake/chip.h

@@ -126,6 +126,8 @@ struct soc_intel_meteorlake_config {
 	/* Program OC pins for TCSS */
 	struct tcss_port_config tcss_ports[MAX_TYPE_C_PORTS];
 	uint8_t tbt_pcie_port_disable[4];
+	/* Validate TBT firmware authenticated and loaded into IMR */
+	bool tbt_authentication;
 
 	/* SATA related */
 	uint8_t sata_mode;

src/soc/intel/meteorlake/fsp_params.c

@@ -14,8 +14,8 @@
 #include <intelblocks/lpss.h>
 #include <intelblocks/xdci.h>
 #include <intelpch/lockdown.h>
-#include <intelblocks/tcss.h>
 #include <security/vboot/vboot_common.h>
+#include <soc/cpu.h>
 #include <soc/gpio_soc_defs.h>
 #include <soc/intel/common/vbt.h>
 #include <soc/pci_devs.h>
@@ -23,7 +23,6 @@
 #include <soc/ramstage.h>
 #include <soc/soc_chip.h>
 #include <soc/soc_info.h>
-#include <soc/cpu.h>
 #include <string.h>
 
 /* THC assignment definition */

src/soc/intel/meteorlake/tcss.c

@@ -1,8 +1,15 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <intelblocks/tcss.h>
+#include <soc/soc_chip.h>
 
 const struct soc_tcss_ops tcss_ops = {
-	.configure_aux_bias_pads = tcss_configure_aux_bias_pads_regbar,
-	.valid_tbt_auth = tcss_valid_tbt_auth,
+	.configure_aux_bias_pads = ioe_tcss_configure_aux_bias_pads_sbi,
+	.valid_tbt_auth = ioe_tcss_valid_tbt_auth,
 };
+
+bool ioe_tcss_valid_tbt_auth(void)
+{
+	const config_t *config = config_of_soc();
+	return config->tbt_authentication;
+}