src/intel: Define HFSTS3 register

Changes:
1. Define HFSTS3 register across SoCs(apl/cnl/icl/tgl).
2. Define cse_is_hfs3_fw_sku_custom() which checks ME's Firmware SKU
   is Custom or not.

TEST=Verified on hatch, soraka, bobba and iclrvp.

Change-Id: I4188e58a4a08d87be2d84674e00ed1407fb8bf82
Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38798
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rizwan Qureshi <rizwan.qureshi@intel.com>

src/soc/intel/apollolake/include/soc/me.h

@@ -40,4 +40,18 @@ union me_hfsts1 {
 	} __packed fields;
 };
 
+/* ME Host Firmware Status Register 3 */
+union me_hfsts3 {
+	u32 data;
+	struct {
+		u32 reserved_0: 4;
+		u32 fw_sku: 3;
+		u32 reserved_7: 2;
+		u32 reserved_9: 2;
+		u32 resered_11: 3;
+		u32 resered_14: 16;
+		u32 reserved_30: 2;
+	} __packed fields;
+};
+
 #endif /* _APOLLOLAKE_ME_H_ */

src/soc/intel/cannonlake/include/soc/me.h

@@ -44,6 +44,20 @@ union me_hfsts1 {
 	} __packed fields;
 };
 
+/* ME Host Firmware Status Register 3 */
+union me_hfsts3 {
+	u32 data;
+	struct {
+		u32 reserved_0: 4;
+		u32 fw_sku: 3;
+		u32 reserved_7: 2;
+		u32 reserved_9: 2;
+		u32 resered_11: 3;
+		u32 resered_14: 16;
+		u32 reserved_30: 2;
+	} __packed fields;
+};
+
 void dump_me_status(void *unused);
 
 #endif /* _CANNONLAKE_ME_H_ */

src/soc/intel/common/block/cse/cse.c

@@ -270,6 +270,13 @@ bool cse_is_hfs1_com_soft_temp_disable(void)
 	return cse_check_hfs1_com(ME_HFS1_COM_SOFT_TEMP_DISABLE);
 }
 
+bool cse_is_hfs3_fw_sku_custom(void)
+{
+	union me_hfsts3 hfs3;
+	hfs3.data = me_read_config32(PCI_ME_HFSTS3);
+	return hfs3.fields.fw_sku == ME_HFS3_FW_SKU_CUSTOM;
+}
+
 /* Makes the host ready to communicate with CSE */
 void cse_set_host_ready(void)
 {

src/soc/intel/common/block/include/intelblocks/cse.h

@@ -186,4 +186,10 @@ bool cse_is_hfs1_com_secover_mei_msg(void);
  */
 bool cse_is_hfs1_com_soft_temp_disable(void);
 
+/*
+ * Checks CSE's Firmware SKU is Custom or not.
+ * Returns true if CSE's Firmware SKU is Custom, otherwise false
+ */
+bool cse_is_hfs3_fw_sku_custom(void);
+
 #endif // SOC_INTEL_COMMON_CSE_H

src/soc/intel/icelake/include/soc/me.h

@@ -40,4 +40,18 @@ union me_hfsts1 {
 	} __packed fields;
 };
 
+/* ME Host Firmware Status Register 3 */
+union me_hfsts3 {
+	u32 data;
+	struct {
+		u32 reserved_0: 4;
+		u32 fw_sku: 3;
+		u32 reserved_7: 2;
+		u32 reserved_9: 2;
+		u32 resered_11: 3;
+		u32 resered_14: 16;
+		u32 reserved_30: 2;
+	} __packed fields;
+};
+
 #endif /* _ICELAKE_ME_H_ */

src/soc/intel/tigerlake/include/soc/me.h

@@ -40,4 +40,17 @@ union me_hfsts1 {
 	} __packed fields;
 };
 
+/* ME Host Firmware Status Register 3 */
+union me_hfsts3 {
+	u32 data;
+	struct {
+		u32 reserved_0: 4;
+		u32 fw_sku: 3;
+		u32 reserved_7: 2;
+		u32 reserved_9: 2;
+		u32 resered_11: 3;
+		u32 resered_14: 16;
+		u32 reserved_30: 2;
+	} __packed fields;
+};
 #endif /* _TIGERLAKE_ME_H_ */