4 files changed, 69 insertions, 8 deletions
diff --git a/src/mainboard/google/slippy/acpi_tables.c b/src/mainboard/google/slippy/acpi_tables.c
index 51b230c58d..7a3ccea50c 100644
--- a/src/mainboard/google/slippy/acpi_tables.c
+++ b/src/mainboard/google/slippy/acpi_tables.c
@@ -279,6 +279,13 @@ unsigned long write_acpi_tables(unsigned long start)
 	acpi_add_table(rsdp, ssdt);
 	ALIGN_CURRENT;
 
+	printk(BIOS_DEBUG, "ACPI:     * SSDT2\n");
+	ssdt = (acpi_header_t *)current;
+	acpi_create_serialio_ssdt(ssdt);
+	current += ssdt->length;
+	acpi_add_table(rsdp, ssdt);
+	ALIGN_CURRENT;
+
 	printk(BIOS_DEBUG, "current = %lx\n", current);
 	printk(BIOS_INFO, "ACPI: done.\n");
 	return current;
diff --git a/src/southbridge/intel/lynxpoint/acpi.c b/src/southbridge/intel/lynxpoint/acpi.c
index 4118b9df6d..ccf43231e2 100644
--- a/src/southbridge/intel/lynxpoint/acpi.c
+++ b/src/southbridge/intel/lynxpoint/acpi.c
@@ -18,9 +18,13 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <arch/acpi.h>
+#include <arch/acpigen.h>
+#include <cbmem.h>
 #include <types.h>
 #include <string.h>
 #include "pch.h"
+#include "nvs.h"
 
 void acpi_create_intel_hpet(acpi_hpet_t * hpet)
 {
@@ -53,3 +57,41 @@ void acpi_create_intel_hpet(acpi_hpet_t * hpet)
 	    acpi_checksum((void *) hpet, sizeof(acpi_hpet_t));
 }
 
+static int acpi_create_serialio_ssdt_entry(int id, global_nvs_t *gnvs)
+{
+	char sio_name[5] = {};
+	sprintf(sio_name, "S%1uEN", id);
+	return acpigen_write_name_byte(sio_name, gnvs->s0b[id] ? 1 : 0);
+}
+
+void acpi_create_serialio_ssdt(acpi_header_t *ssdt)
+{
+	unsigned long current = (unsigned long)ssdt + sizeof(acpi_header_t);
+	global_nvs_t *gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
+	int id, len = 0;
+
+	if (!gnvs)
+		return;
+
+	/* Fill the SSDT header */
+	memset((void *)ssdt, 0, sizeof(acpi_header_t));
+	memcpy(&ssdt->signature, "SSDT", 4);
+	ssdt->revision = 2;
+	memcpy(&ssdt->oem_id, OEM_ID, 6);
+	memcpy(&ssdt->oem_table_id, ACPI_TABLE_CREATOR, 8);
+	ssdt->oem_revision = 42;
+	memcpy(&ssdt->asl_compiler_id, ASLC, 4);
+	ssdt->asl_compiler_revision = 42;
+	ssdt->length = sizeof(acpi_header_t);
+	acpigen_set_current((char *) current);
+
+	/* Fill the SSDT with an entry for each SerialIO device */
+	for (id = 0; id < 8; id++)
+		len += acpi_create_serialio_ssdt_entry(id, gnvs);
+	acpigen_patch_len(len-1);
+
+	/* (Re)calculate length and checksum. */
+	current = (unsigned long)acpigen_get_current();
+	ssdt->length = current - (unsigned long)ssdt;
+	ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
+}
diff --git a/src/southbridge/intel/lynxpoint/acpi/serialio.asl b/src/southbridge/intel/lynxpoint/acpi/serialio.asl
index 03f6974a38..4c0d36bcc6 100644
--- a/src/southbridge/intel/lynxpoint/acpi/serialio.asl
+++ b/src/southbridge/intel/lynxpoint/acpi/serialio.asl
@@ -24,6 +24,17 @@
 // Serial IO Device BAR0 and BAR1 is 4KB
 #define SIO_BAR_LEN 0x1000
 
+// This is defined in SSDT2 which is generated at boot based
+// on whether or not the device is enabled in ACPI mode.
+External(\S0EN)
+External(\S1EN)
+External(\S2EN)
+External(\S3EN)
+External(\S4EN)
+External(\S5EN)
+External(\S6EN)
+External(\S7EN)
+
 // Serial IO Resource Consumption for BAR1
 Device (SIOR)
 {
@@ -143,7 +154,7 @@ Device (SDMA)
 
 	Method (_STA, 0, NotSerialized)
 	{
-		If (LEqual (\S0B0, 0)) {
+		If (LEqual (\S0EN, 0)) {
 			Return (0x0)
 		} Else {
 			Return (0xF)
@@ -194,7 +205,7 @@ Device (I2C0)
 
 	Method (_STA, 0, NotSerialized)
 	{
-		If (LEqual (\S1B0, 0)) {
+		If (LEqual (\S1EN, 0)) {
 			Return (0x0)
 		} Else {
 			Return (0xF)
@@ -245,7 +256,7 @@ Device (I2C1)
 
 	Method (_STA, 0, NotSerialized)
 	{
-		If (LEqual (\S2B0, 0)) {
+		If (LEqual (\S2EN, 0)) {
 			Return (0x0)
 		} Else {
 			Return (0xF)
@@ -283,7 +294,7 @@ Device (SPI0)
 
 	Method (_STA, 0, NotSerialized)
 	{
-		If (LEqual (\S3B0, 0)) {
+		If (LEqual (\S3EN, 0)) {
 			Return (0x0)
 		} Else {
 			Return (0xF)
@@ -334,7 +345,7 @@ Device (SPI1)
 
 	Method (_STA, 0, NotSerialized)
 	{
-		If (LEqual (\S4B0, 0)) {
+		If (LEqual (\S4EN, 0)) {
 			Return (0x0)
 		} Else {
 			Return (0xF)
@@ -385,7 +396,7 @@ Device (UAR0)
 
 	Method (_STA, 0, NotSerialized)
 	{
-		If (LEqual (\S5B0, 0)) {
+		If (LEqual (\S5EN, 0)) {
 			Return (0x0)
 		} Else {
 			Return (0xF)
@@ -423,7 +434,7 @@ Device (UAR1)
 
 	Method (_STA, 0, NotSerialized)
 	{
-		If (LEqual (\S6B0, 0)) {
+		If (LEqual (\S6EN, 0)) {
 			Return (0x0)
 		} Else {
 			Return (0xF)
@@ -461,7 +472,7 @@ Device (SDIO)
 
 	Method (_STA, 0, NotSerialized)
 	{
-		If (LEqual (\S7B0, 0)) {
+		If (LEqual (\S7EN, 0)) {
 			Return (0x0)
 		} Else {
 			Return (0xF)
diff --git a/src/southbridge/intel/lynxpoint/pch.h b/src/southbridge/intel/lynxpoint/pch.h
index 58b07d16cc..ca1d8b1b68 100644
--- a/src/southbridge/intel/lynxpoint/pch.h
+++ b/src/southbridge/intel/lynxpoint/pch.h
@@ -167,6 +167,7 @@ void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue);
 void pch_log_state(void);
 #endif
 void acpi_create_intel_hpet(acpi_hpet_t * hpet);
+void acpi_create_serialio_ssdt(acpi_header_t *ssdt);
 
 /* These helpers are for performing SMM relocation. */
 void southbridge_trigger_smi(void);