[PATCH 2/6] ti_sci_* : Add capability to access DM firmware's metadata

[Moteen Shah]

Introduce response and request structs to receive and request
information regarding DM version, etc from TI SCI.

Signed-off-by: Moteen Shah <m-shah at ti.com>
---
 drivers/firmware/ti_sci.h              | 29 ++++++++++++++++++++++++++
 include/linux/soc/ti/ti_sci_protocol.h | 26 +++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h
index f3d9eb453b4..6ef77d83114 100644
--- a/drivers/firmware/ti_sci.h
+++ b/drivers/firmware/ti_sci.h
@@ -19,6 +19,7 @@
 #define TI_SCI_MSG_ENABLE_WDT		0x0000
 #define TI_SCI_MSG_WAKE_RESET		0x0001
 #define TI_SCI_MSG_VERSION		0x0002
+#define TI_SCI_MSG_DM_VERSION		0x000F
 #define TI_SCI_MSG_WAKE_REASON		0x0003
 #define TI_SCI_MSG_GOODBYE		0x0004
 #define TI_SCI_MSG_SYS_RESET		0x0005
@@ -135,6 +136,34 @@ struct ti_sci_msg_resp_version {
 	u8 abi_minor;
 } __packed;
 
+/**
+ * struct ti_sci_msg_dm_resp_version - Response for a message
+ * @hdr:		Generic header
+ * @version:		Version number of the firmware
+ * @sub_version:	Sub-version number of the firmware
+ * @patch_version:	Patch version number of the firmware
+ * @abi_major:		Major version of the ABI that firmware supports
+ * @abi_minor:		Minor version of the ABI that firmware supports
+ * @sci_server_version:	String describing the SCI server version
+ * @rm_pm_hal_version:	String describing the RM PM HAL version
+ *
+ * In general, ABI version changes follow the rule that minor version increments
+ * are backward compatible. Major revision changes in ABI may not be
+ * backward compatible.
+ *
+ * Response to a message with message type TI_SCI_MSG_DM_VERSION
+ */
+struct ti_sci_msg_dm_resp_version {
+	struct ti_sci_msg_hdr hdr;
+	u16	version;
+	u8	sub_version;
+	u8	patch_version;
+	u8	abi_major;
+	u8	abi_minor;
+	char rm_pm_hal_version[12];
+	char sci_server_version[26];
+} __packed;
+
 /**
  * struct ti_sci_query_fw_caps_resp - Response for a message
  * @hdr:	Generic header
diff --git a/include/linux/soc/ti/ti_sci_protocol.h b/include/linux/soc/ti/ti_sci_protocol.h
index 05a19a8d86c..3f13a980433 100644
--- a/include/linux/soc/ti/ti_sci_protocol.h
+++ b/include/linux/soc/ti/ti_sci_protocol.h
@@ -30,6 +30,28 @@ struct ti_sci_version_info {
 	char firmware_description[32];
 };
 
+/**
+ * struct ti_sci_dm_version_info - version information structure
+ * @abi_major:		Major ABI version. Change here implies risk of backward
+ *			compatibility break.
+ * @abi_minor:		Minor ABI version. Change here implies new feature addition,
+ *			or compatible change in ABI.
+ * @patch_ver:		Patch version of the firmware.
+ * @sub_ver:		Sub-version of the firmware.
+ * @dm_ver:		DM version.
+ * @sci_server_version:	Version string of the SCI server.
+ * @rm_pm_hal_version:	Version string of the RM PM HAL.
+ */
+struct ti_sci_dm_version_info {
+	u8 abi_major;
+	u8 abi_minor;
+	u8 patch_ver;
+	u8 sub_ver;
+	u16 dm_ver;
+	char rm_pm_hal_version[12];
+	char sci_server_version[26];
+};
+
 struct ti_sci_handle;
 
 /**
@@ -264,10 +286,14 @@ struct ti_sci_core_ops {
 /**
  * struct ti_sci_firmware_ops - DM firmware operations
  * @query_dm_cap: Query the DM capabilities
+ * @get_dm_version: Get the DM version.
+ *		    Return 0 for successful query else appropriate error value.
  */
 struct ti_sci_firmware_ops {
 	int (*query_dm_cap)(struct ti_sci_handle *handle,
 			    u64 *dm_cap);
+	int (*get_dm_version)(struct ti_sci_handle *handle,
+			      struct ti_sci_dm_version_info *get_dm_version);
 };
 
 #define TI_SCI_MSG_FLAG_FW_CAP_DM	0x100
-- 
2.34.1