soc/intel/common: Add missing SoC common function into SMM library

Modify SMM common code in order to accommodate SKL, CNL, APL, GLK
SOC code.

Change-Id: Ie9f90df3336c1278b73284815b5197400512c1d2
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/22869
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

4 files changed, 53 insertions, 6 deletions

diff --git a/src/soc/intel/common/block/include/intelblocks/smihandler.h b/src/soc/intel/common/block/include/intelblocks/smihandler.h
index 5df5552685..f1e3ecf9cb 100644
--- a/src/soc/intel/common/block/include/intelblocks/smihandler.h
+++ b/src/soc/intel/common/block/include/intelblocks/smihandler.h
@@ -60,6 +60,11 @@ const struct smm_save_state_ops *get_smm_save_state_ops(void);
  */
 extern const smi_handler_t southbridge_smi[32];
 
+#define SMI_HANDLER_SCI_EN(__bit)	(1 << (__bit))
+
+/* SMI handlers that should be serviced in SCI mode too. */
+uint32_t smi_handler_get_sci_mask(void);
+
 /*
  * This function should be implemented in SOC specific code to handle
  * the SMI event on SLP_EN. The default functionality is provided in
@@ -145,6 +150,12 @@ void smihandler_southbridge_espi(
 int smihandler_disable_busmaster(device_t dev);
 
 /*
+ * SoC needs to implement the mechanism to know if an illegal attempt
+ * has been made to write to the BIOS area.
+ */
+void smihandler_check_illegal_access(uint32_t tco_sts);
+
+/*
  * Returns gnvs pointer within SMM context
  */
 struct global_nvs_t *smm_get_gnvs(void);
diff --git a/src/soc/intel/common/block/include/intelblocks/smm.h b/src/soc/intel/common/block/include/intelblocks/smm.h
index 84f34a5a7b..f560f24e2b 100644
--- a/src/soc/intel/common/block/include/intelblocks/smm.h
+++ b/src/soc/intel/common/block/include/intelblocks/smm.h
@@ -29,7 +29,7 @@
  * SMIs.
  */
 void smm_southbridge_clear_state(void);
-void smm_southbridge_enable(void);
+void smm_southbridge_enable(uint16_t pm1_events);
 /* API to get SMM region start and size based on Host Bridge register */
 void smm_region_info(void **start, size_t *size);
 
diff --git a/src/soc/intel/common/block/smm/smihandler.c b/src/soc/intel/common/block/smm/smihandler.c
index 7821dbaddc..9a4ee7cf96 100644
--- a/src/soc/intel/common/block/smm/smihandler.c
+++ b/src/soc/intel/common/block/smm/smihandler.c
@@ -21,6 +21,7 @@
 #include <cpu/x86/smm.h>
 #include <device/pci_def.h>
 #include <elog.h>
+#include <intelblocks/fast_spi.h>
 #include <intelblocks/pmclib.h>
 #include <intelblocks/smihandler.h>
 #include <intelblocks/uart.h>
@@ -35,11 +36,28 @@
 /* GNVS needs to be set by coreboot initiating a software SMI. */
 static struct global_nvs_t *gnvs;
 
+/* SoC overrides. */
+
 __attribute__((weak)) int smihandler_disable_busmaster(device_t dev)
 {
 	return 1;
 }
 
+/* SMI handlers that should be serviced in SCI mode too. */
+__attribute__((weak)) uint32_t smi_handler_get_sci_mask(void)
+{
+	return 0; /* No valid SCI mask for SMI handler */
+}
+
+/*
+ * Needs to implement the mechanism to know if an illegal attempt
+ * has been made to write to the BIOS area.
+ */
+__attribute__((weak)) void smihandler_check_illegal_access(uint32_t tco_sts)
+{
+	return;
+}
+
 static void *find_save_state(const struct smm_save_state_ops *save_state_ops,
 	int cmd)
 {
@@ -175,6 +193,8 @@ void smihandler_southbridge_sleep(
 
 		/* Disable all GPE */
 		pmc_disable_all_gpe();
+		/* Set which state system will be after power reapplied */
+		pmc_soc_restore_power_failure();
 		/* also iterates over all bridges on bus 0 */
 		busmaster_disable_on_bus(0);
 		break;
@@ -201,8 +221,7 @@ void smihandler_southbridge_sleep(
 	 * the line above. However, if we entered sleep state S1 and wake
 	 * up again, we will continue to execute code in this function.
 	 */
-	reg32 = inl(ACPI_BASE_ADDRESS + PM1_CNT);
-	if (reg32 & SCI_EN) {
+	if (pmc_read_pm1_control() & SCI_EN) {
 		/* The OS is not an ACPI OS, so we set the state to S0 */
 		pmc_disable_pm1_control(SLP_EN | SLP_TYP);
 	}
@@ -240,6 +259,9 @@ static void finalize(void)
 	}
 	finalize_done = 1;
 
+	if (IS_ENABLED(CONFIG_SPI_FLASH_SMM))
+		/* Re-init SPI driver to handle locked BAR */
+		fast_spi_init();
 }
 
 void smihandler_southbridge_apmc(
@@ -308,12 +330,13 @@ void smihandler_southbridge_pm1(
 	const struct smm_save_state_ops *save_state_ops)
 {
 	uint16_t pm1_sts = pmc_clear_pm1_status();
+	u16 pm1_en = pmc_read_pm1_enable();
 
 	/*
 	 * While OSPM is not active, poweroff immediately
 	 * on a power button event.
 	 */
-	if (pm1_sts & PWRBTN_STS) {
+	if ((pm1_sts & PWRBTN_STS) && (pm1_en & PWRBTN_EN)) {
 		/* power button pressed */
 		if (IS_ENABLED(CONFIG_ELOG_GSMI))
 			elog_add_event(ELOG_TYPE_POWER_BUTTON);
@@ -337,6 +360,8 @@ void smihandler_southbridge_tco(
 	if (!tco_sts)
 		return;
 
+	smihandler_check_illegal_access(tco_sts);
+
 	if (tco_sts & TCO_TIMEOUT) { /* TIMEOUT */
 		/* Handle TCO timeout */
 		printk(BIOS_DEBUG, "TCO Timeout.\n");
@@ -391,6 +416,17 @@ void southbridge_smi_handler(void)
 	 */
 	smi_sts = pmc_clear_smi_status();
 
+	/*
+	 * In SCI mode, execute only those SMI handlers that have
+	 * declared themselves as available for service in that mode
+	 * using smi_handler_get_sci_mask.
+	 */
+	if (pmc_read_pm1_control() & SCI_EN)
+		smi_sts &= smi_handler_get_sci_mask();
+
+	if (!smi_sts)
+		return;
+
 	save_state_ops = get_smm_save_state_ops();
 
 	/* Call SMI sub handler for each of the status bits */
diff --git a/src/soc/intel/common/block/smm/smm.c b/src/soc/intel/common/block/smm/smm.c
index d5f42a76e6..e8c52459a1 100644
--- a/src/soc/intel/common/block/smm/smm.c
+++ b/src/soc/intel/common/block/smm/smm.c
@@ -38,11 +38,11 @@ void smm_southbridge_clear_state(void)
 	pmc_clear_all_gpe_status();
 }
 
-void smm_southbridge_enable(void)
+void smm_southbridge_enable(uint16_t pm1_events)
 {
 	printk(BIOS_DEBUG, "Enabling SMIs.\n");
 	/* Configure events */
-	pmc_enable_pm1(PWRBTN_EN | GBL_EN);
+	pmc_enable_pm1(pm1_events);
 	pmc_disable_std_gpe(PME_B0_EN);
 
 	/*