Re: [PATCH 1/2] bus/fsl-mc: Add generic implementation for open/reset/close commands

The open/reset/close commands format is similar for all objects.
Currently there are multiple implementations for these commands
scattered through various drivers. The code is cavsi-identical.
Create a generic implementation for the open/reset/close commands.
One of the consumer will be the VFIO driver which needs to
be able to reset a device.

Signed-off-by: Diana Craciun <redacted>
---
 drivers/bus/fsl-mc/Makefile         |   3 +-
 drivers/bus/fsl-mc/fsl-mc-private.h |  39 +++++++++--
 drivers/bus/fsl-mc/obj-api.c        | 104 ++++++++++++++++++++++++++++
 include/linux/fsl/mc.h              |  14 ++++
 4 files changed, 155 insertions(+), 5 deletions(-)
 create mode 100644 drivers/bus/fsl-mc/obj-api.c

diff --git a/drivers/bus/fsl-mc/Makefile b/drivers/bus/fsl-mc/Makefile
index 4ae292a30e53..892946245527 100644
--- a/drivers/bus/fsl-mc/Makefile
+++ b/drivers/bus/fsl-mc/Makefile

@@ -15,7 +15,8 @@ mc-bus-driver-objs := fsl-mc-bus.o \
 		      dprc-driver.o \
 		      fsl-mc-allocator.o \
 		      fsl-mc-msi.o \
-		      dpmcp.o
+		      dpmcp.o \
+		      obj-api.o
 
 # MC userspace support
 obj-$(CONFIG_FSL_MC_UAPI_SUPPORT) += fsl-mc-uapi.o

diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h
index 1958fa065360..6055ef3e9e02 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h

@@ -48,7 +48,6 @@ struct dpmng_rsp_get_version {
 
 /* DPMCP command IDs */
 #define DPMCP_CMDID_CLOSE		DPMCP_CMD(0x800)
-#define DPMCP_CMDID_OPEN		DPMCP_CMD(0x80b)
 #define DPMCP_CMDID_RESET		DPMCP_CMD(0x005)
 
 struct dpmcp_cmd_open {

@@ -91,7 +90,6 @@ int dpmcp_reset(struct fsl_mc_io *mc_io,
 
 /* DPRC command IDs */
 #define DPRC_CMDID_CLOSE                        DPRC_CMD(0x800)
-#define DPRC_CMDID_OPEN                         DPRC_CMD(0x805)
 #define DPRC_CMDID_GET_API_VERSION              DPRC_CMD(0xa05)
 
 #define DPRC_CMDID_GET_ATTR                     DPRC_CMD(0x004)

@@ -453,7 +451,6 @@ int dprc_get_connection(struct fsl_mc_io *mc_io,
 
 /* Command IDs */
 #define DPBP_CMDID_CLOSE		DPBP_CMD(0x800)
-#define DPBP_CMDID_OPEN			DPBP_CMD(0x804)
 
 #define DPBP_CMDID_ENABLE		DPBP_CMD(0x002)
 #define DPBP_CMDID_DISABLE		DPBP_CMD(0x003)

@@ -492,7 +489,6 @@ struct dpbp_rsp_get_attributes {
 
 /* Command IDs */
 #define DPCON_CMDID_CLOSE			DPCON_CMD(0x800)
-#define DPCON_CMDID_OPEN			DPCON_CMD(0x808)
 
 #define DPCON_CMDID_ENABLE			DPCON_CMD(0x002)
 #define DPCON_CMDID_DISABLE			DPCON_CMD(0x003)

@@ -524,6 +520,41 @@ struct dpcon_cmd_set_notification {
 	__le64 user_ctx;
 };
 
+/*
+ * Generic FSL MC API
+ */
+
+/* generic command versioning */
+#define OBJ_CMD_BASE_VERSION		1
+#define OBJ_CMD_ID_OFFSET		4
+
+#define OBJ_CMD(id)	(((id) << OBJ_CMD_ID_OFFSET) | OBJ_CMD_BASE_VERSION)
+
+/* open command codes */
+#define DPRTC_CMDID_OPEN		OBJ_CMD(0x810)
+#define DPNI_CMDID_OPEN		OBJ_CMD(0x801)
+#define DPSW_CMDID_OPEN		OBJ_CMD(0x802)
+#define DPIO_CMDID_OPEN		OBJ_CMD(0x803)
+#define DPBP_CMDID_OPEN		OBJ_CMD(0x804)
+#define DPRC_CMDID_OPEN		OBJ_CMD(0x805)
+#define DPDMUX_CMDID_OPEN		OBJ_CMD(0x806)
+#define DPCI_CMDID_OPEN		OBJ_CMD(0x807)
+#define DPCON_CMDID_OPEN		OBJ_CMD(0x808)
+#define DPSECI_CMDID_OPEN		OBJ_CMD(0x809)
+#define DPAIOP_CMDID_OPEN		OBJ_CMD(0x80a)
+#define DPMCP_CMDID_OPEN		OBJ_CMD(0x80b)
+#define DPMAC_CMDID_OPEN		OBJ_CMD(0x80c)
+#define DPDCEI_CMDID_OPEN		OBJ_CMD(0x80d)
+#define DPDMAI_CMDID_OPEN		OBJ_CMD(0x80e)
+#define DPDBG_CMDID_OPEN		OBJ_CMD(0x80f)
+
+/* Generic object command IDs */
+#define OBJ_CMDID_CLOSE		OBJ_CMD(0x800)
+#define OBJ_CMDID_RESET		OBJ_CMD(0x005)
+
+struct obj_cmd_open {