[PATCH V6 0/3] soc: imx: add scu firmware api support

[PATCH V6 0/3] soc: imx: add scu firmware api support

[Dong Aisheng]

Unlike the former i.MX Architectures, the new generation i.MX8 SoCs
(e.g. MX8QXP and MX8QM) contain a system controller which runs on a
dedicated Cortex-M core to provide power, clock, Pad, and resource
management. Communication between the host processor running
an OS and the system controller happens through a SCU protocol.
This patchset adds the SCU APIs which is implemented based on MU
and will be used by different system components.

It mainly consists of below parts:
1) SCU IPC
   Basic IPC mechanism implemention based on mailbox which is used
   for communication between AP and SCU firmware.
2) SCU IPC Service API

Dong Aisheng (3):
  dt-bindings: arm: fsl: add scu binding doc
  firmware: imx: add SCU firmware driver support
  firmware: imx: add misc svc support

 .../devicetree/bindings/arm/freescale/fsl,scu.txt  | 183 ++++++
 drivers/firmware/Kconfig                           |   1 +
 drivers/firmware/imx/Kconfig                       |  11 +
 drivers/firmware/imx/Makefile                      |   2 +
 drivers/firmware/imx/imx-scu.c                     | 223 ++++++++
 drivers/firmware/imx/misc.c                        | 106 ++++
 include/soc/imx/scu/ipc.h                          |  59 ++
 include/soc/imx/scu/sci.h                          |  17 +
 include/soc/imx/scu/svc/misc.h                     |  59 ++
 include/soc/imx/scu/types.h                        | 636 +++++++++++++++++++++
 10 files changed, 1297 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
 create mode 100644 drivers/firmware/imx/Kconfig
 create mode 100644 drivers/firmware/imx/Makefile
 create mode 100644 drivers/firmware/imx/imx-scu.c
 create mode 100644 drivers/firmware/imx/misc.c
 create mode 100644 include/soc/imx/scu/ipc.h
 create mode 100644 include/soc/imx/scu/sci.h
 create mode 100644 include/soc/imx/scu/svc/misc.h
 create mode 100644 include/soc/imx/scu/types.h

-- 
2.7.4

[PATCH V6 1/3] dt-bindings: arm: fsl: add scu binding doc

[Dong Aisheng]

The System Controller Firmware (SCFW) is a low-level system function
which runs on a dedicated Cortex-M core to provide power, clock, and
resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
(QM, QP), and i.MX8QX (QXP, DX).

Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v5->v6:
 * add input clocks to clock bindings according to Rob's suggestion
 * typo clean up
v4->v5:
 * scu node should be under firmware node
 * add pd/clk/pinctrl binding as well according to Rob's suggestion
 * switch to new generic MU binding
   Use 8 separate mu channels in one MU instance for SCU communication
v3->v4:
 * fully change to mailbox binding
 * add child node description
v2->v3:
 * update a bit to mailbox binding
v1->v2:
 * remove status
 * changed to mu1
---
 .../devicetree/bindings/arm/freescale/fsl,scu.txt  | 183 +++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt

diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
new file mode 100644
index 0000000..46d0af1
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -0,0 +1,183 @@
+NXP i.MX System Controller Firmware (SCFW)
+--------------------------------------------------------------------
+
+The System Controller Firmware (SCFW) is a low-level system function
+which runs on a dedicated Cortex-M core to provide power, clock, and
+resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
+(QM, QP), and i.MX8QX (QXP, DX).
+
+The AP communicates with the SC using a multi-ported MU module found
+in the LSIO subsystem. The current definition of this MU module provides
+5 remote AP connections to the SC to support up to 5 execution environments
+(TZ, HV, standard Linux, etc.). The SC side of this MU module interfaces
+with the LSIO DSC IP bus. The SC firmware will communicate with this MU
+using the MSI bus.
+
+System Controller Device Node:
+============================================================
+
+The scu node with the following properties shall be under the /firmware/ node.
+
+Required properties:
+-------------------
+- compatible:	should be "fsl,imx-scu".
+- mbox-names:	should include "tx0", "tx1", "tx2", "tx3",
+			       "rx0", "rx1", "rx2", "rx3".
+- mboxes:	List of phandle of 4 MU channels for tx and 4 MU channels
+		for rx. All 8 MU channels must be in the same MU instance.
+		Cross instances are not allowed. The MU instance can only
+		be one of LSIO MU0~M4 for imx8qxp and imx8qm. Users need
+		to make sure use the one which is not conflict with other
+		execution environments. e.g. ATF.
+		Note:
+		Channel 0 must be "tx0" or "rx0".
+		Channel 1 must be "tx1" or "rx1".
+		Channel 2 must be "tx2" or "rx2".
+		Channel 3 must be "tx3" or "rx3".
+		e.g.
+		mboxes = <&lsio_mu1 0 0
+			  &lsio_mu1 0 1
+			  &lsio_mu1 0 2
+			  &lsio_mu1 0 3
+			  &lsio_mu1 1 0
+			  &lsio_mu1 1 1
+			  &lsio_mu1 1 2
+			  &lsio_mu1 1 3>;
+		See Documentation/devicetree/bindings/mailbox/fsl,mu.txt
+		for detailed mailbox binding.
+
+i.MX SCU Client Device Node:
+============================================================
+
+Client nodes are maintained as children of the relevant IMX-SCU device node.
+
+Power domain bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+This binding for the SCU power domain providers uses the generic power
+domain binding[2].
+
+Required properties:
+- compatible:		Should be "fsl,scu-pd".
+- #address-cells:	Should be 1.
+- #size-cells:		Should be 0.
+
+Required properties for power domain sub nodes:
+- #power-domain-cells:	Must be 0.
+
+Optional Properties:
+- reg:			Resource ID of this power domain.
+			No exist means uncontrollable by user.
+			See detailed Resource ID list from:
+			include/dt-bindings/power/imx-rsrc.h
+- power-domains:	phandle pointing to the parent power domain.
+
+Clock bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+This binding uses the common clock binding[1].
+
+Required properties:
+- compatible:		Should be "fsl,imx8qxp-clock".
+- #clock-cells:		Should be 1. Contains the Clock ID value.
+- clocks:		List of clock specifiers, must contain an entry for
+			each required entry in clock-names
+- clock-names:		Should include entries "xtal_32KHz", "xtal_24MHz"
+
+The clock consumer should specify the desired clock by having the clock
+ID in its "clocks" phandle cell.
+
+See the full list of clock IDs from:
+include/dt-bindings/clock/imx8qxp-clock.h
+
+Pinctrl bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+This binding uses the i.MX common pinctrl binding[3].
+
+Required properties:
+- compatible:		Should be "fsl,imx8qxp-iomuxc".
+
+Required properties for Pinctrl sub nodes:
+- fsl,pins:		Each entry consists of 3 integers which represents
+			the mux and config setting for one pin. The first 2
+			integers <pin_id mux_mode> are specified using a
+			PIN_FUNC_ID macro, which can be found in
+			<dt-bindings/pinctrl/pads-imx8qxp.h>.
+			The last integer CONFIG is the pad setting value like
+			pull-up on this pin.
+
+			Please refer to i.MX8QXP Reference Manual for detailed
+			CONFIG settings.
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+[2] Documentation/devicetree/bindings/power/power_domain.txt
+[3] Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt
+
+Example (imx8qxp):
+-------------
+lsio_mu1: mailbox@5d1c0000 {
+	...
+	#mbox-cells = <2>;
+};
+
+firmware {
+	scu {
+		compatible = "fsl,imx-scu";
+		mbox-names = "tx0", "tx1", "tx2", "tx3",
+			     "rx0", "rx1", "rx2", "rx3";
+		mboxes = <&lsio_mu1 0 0
+			  &lsio_mu1 0 1
+			  &lsio_mu1 0 2
+			  &lsio_mu1 0 3
+			  &lsio_mu1 1 0
+			  &lsio_mu1 1 1
+			  &lsio_mu1 1 2
+			  &lsio_mu1 1 3>;
+
+		clk: clk {
+			compatible = "fsl,imx8qxp-clk";
+			#clock-cells = <1>;
+		};
+
+		iomuxc {
+			compatible = "fsl,imx8qxp-iomuxc";
+
+			pinctrl_lpuart0: lpuart0grp {
+				fsl,pins = <
+					SC_P_UART0_RX_ADMA_UART0_RX	0x06000020
+					SC_P_UART0_TX_ADMA_UART0_TX	0x06000020
+				>;
+			};
+			...
+		};
+
+		imx8qx-pm {
+			compatible = "fsl,scu-pd";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			pd_dma: dma-power-domain {
+				#power-domain-cells = <0>;
+
+				pd_dma_lpuart0: dma-lpuart0@57 {
+					reg = <SC_R_UART_0>;
+					#power-domain-cells = <0>;
+					power-domains = <&pd_dma>;
+				};
+				...
+			};
+			...
+		};
+	};
+};
+
+serial@5a060000 {
+	...
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lpuart0>;
+	clocks = <&clk IMX8QXP_UART0_CLK>,
+		 <&clk IMX8QXP_UART0_IPG_CLK>;
+	clock-names = "per", "ipg";
+	power-domains = <&pd_dma_lpuart0>;
+};
-- 
2.7.4

[PATCH V6 1/3] dt-bindings: arm: fsl: add scu binding doc

[Dong Aisheng]

The System Controller Firmware (SCFW) is a low-level system function
which runs on a dedicated Cortex-M core to provide power, clock, and
resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
(QM, QP), and i.MX8QX (QXP, DX).

Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree at vger.kernel.org
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v5->v6:
 * add input clocks to clock bindings according to Rob's suggestion
 * typo clean up
v4->v5:
 * scu node should be under firmware node
 * add pd/clk/pinctrl binding as well according to Rob's suggestion
 * switch to new generic MU binding
   Use 8 separate mu channels in one MU instance for SCU communication
v3->v4:
 * fully change to mailbox binding
 * add child node description
v2->v3:
 * update a bit to mailbox binding
v1->v2:
 * remove status
 * changed to mu1
---
 .../devicetree/bindings/arm/freescale/fsl,scu.txt  | 183 +++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt

diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
new file mode 100644
index 0000000..46d0af1
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -0,0 +1,183 @@
+NXP i.MX System Controller Firmware (SCFW)
+--------------------------------------------------------------------
+
+The System Controller Firmware (SCFW) is a low-level system function
+which runs on a dedicated Cortex-M core to provide power, clock, and
+resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
+(QM, QP), and i.MX8QX (QXP, DX).
+
+The AP communicates with the SC using a multi-ported MU module found
+in the LSIO subsystem. The current definition of this MU module provides
+5 remote AP connections to the SC to support up to 5 execution environments
+(TZ, HV, standard Linux, etc.). The SC side of this MU module interfaces
+with the LSIO DSC IP bus. The SC firmware will communicate with this MU
+using the MSI bus.
+
+System Controller Device Node:
+============================================================
+
+The scu node with the following properties shall be under the /firmware/ node.
+
+Required properties:
+-------------------
+- compatible:	should be "fsl,imx-scu".
+- mbox-names:	should include "tx0", "tx1", "tx2", "tx3",
+			       "rx0", "rx1", "rx2", "rx3".
+- mboxes:	List of phandle of 4 MU channels for tx and 4 MU channels
+		for rx. All 8 MU channels must be in the same MU instance.
+		Cross instances are not allowed. The MU instance can only
+		be one of LSIO MU0~M4 for imx8qxp and imx8qm. Users need
+		to make sure use the one which is not conflict with other
+		execution environments. e.g. ATF.
+		Note:
+		Channel 0 must be "tx0" or "rx0".
+		Channel 1 must be "tx1" or "rx1".
+		Channel 2 must be "tx2" or "rx2".
+		Channel 3 must be "tx3" or "rx3".
+		e.g.
+		mboxes = <&lsio_mu1 0 0
+			  &lsio_mu1 0 1
+			  &lsio_mu1 0 2
+			  &lsio_mu1 0 3
+			  &lsio_mu1 1 0
+			  &lsio_mu1 1 1
+			  &lsio_mu1 1 2
+			  &lsio_mu1 1 3>;
+		See Documentation/devicetree/bindings/mailbox/fsl,mu.txt
+		for detailed mailbox binding.
+
+i.MX SCU Client Device Node:
+============================================================
+
+Client nodes are maintained as children of the relevant IMX-SCU device node.
+
+Power domain bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+This binding for the SCU power domain providers uses the generic power
+domain binding[2].
+
+Required properties:
+- compatible:		Should be "fsl,scu-pd".
+- #address-cells:	Should be 1.
+- #size-cells:		Should be 0.
+
+Required properties for power domain sub nodes:
+- #power-domain-cells:	Must be 0.
+
+Optional Properties:
+- reg:			Resource ID of this power domain.
+			No exist means uncontrollable by user.
+			See detailed Resource ID list from:
+			include/dt-bindings/power/imx-rsrc.h
+- power-domains:	phandle pointing to the parent power domain.
+
+Clock bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+This binding uses the common clock binding[1].
+
+Required properties:
+- compatible:		Should be "fsl,imx8qxp-clock".
+- #clock-cells:		Should be 1. Contains the Clock ID value.
+- clocks:		List of clock specifiers, must contain an entry for
+			each required entry in clock-names
+- clock-names:		Should include entries "xtal_32KHz", "xtal_24MHz"
+
+The clock consumer should specify the desired clock by having the clock
+ID in its "clocks" phandle cell.
+
+See the full list of clock IDs from:
+include/dt-bindings/clock/imx8qxp-clock.h
+
+Pinctrl bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+This binding uses the i.MX common pinctrl binding[3].
+
+Required properties:
+- compatible:		Should be "fsl,imx8qxp-iomuxc".
+
+Required properties for Pinctrl sub nodes:
+- fsl,pins:		Each entry consists of 3 integers which represents
+			the mux and config setting for one pin. The first 2
+			integers <pin_id mux_mode> are specified using a
+			PIN_FUNC_ID macro, which can be found in
+			<dt-bindings/pinctrl/pads-imx8qxp.h>.
+			The last integer CONFIG is the pad setting value like
+			pull-up on this pin.
+
+			Please refer to i.MX8QXP Reference Manual for detailed
+			CONFIG settings.
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+[2] Documentation/devicetree/bindings/power/power_domain.txt
+[3] Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt
+
+Example (imx8qxp):
+-------------
+lsio_mu1: mailbox at 5d1c0000 {
+	...
+	#mbox-cells = <2>;
+};
+
+firmware {
+	scu {
+		compatible = "fsl,imx-scu";
+		mbox-names = "tx0", "tx1", "tx2", "tx3",
+			     "rx0", "rx1", "rx2", "rx3";
+		mboxes = <&lsio_mu1 0 0
+			  &lsio_mu1 0 1
+			  &lsio_mu1 0 2
+			  &lsio_mu1 0 3
+			  &lsio_mu1 1 0
+			  &lsio_mu1 1 1
+			  &lsio_mu1 1 2
+			  &lsio_mu1 1 3>;
+
+		clk: clk {
+			compatible = "fsl,imx8qxp-clk";
+			#clock-cells = <1>;
+		};
+
+		iomuxc {
+			compatible = "fsl,imx8qxp-iomuxc";
+
+			pinctrl_lpuart0: lpuart0grp {
+				fsl,pins = <
+					SC_P_UART0_RX_ADMA_UART0_RX	0x06000020
+					SC_P_UART0_TX_ADMA_UART0_TX	0x06000020
+				>;
+			};
+			...
+		};
+
+		imx8qx-pm {
+			compatible = "fsl,scu-pd";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			pd_dma: dma-power-domain {
+				#power-domain-cells = <0>;
+
+				pd_dma_lpuart0: dma-lpuart0 at 57 {
+					reg = <SC_R_UART_0>;
+					#power-domain-cells = <0>;
+					power-domains = <&pd_dma>;
+				};
+				...
+			};
+			...
+		};
+	};
+};
+
+serial at 5a060000 {
+	...
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lpuart0>;
+	clocks = <&clk IMX8QXP_UART0_CLK>,
+		 <&clk IMX8QXP_UART0_IPG_CLK>;
+	clock-names = "per", "ipg";
+	power-domains = <&pd_dma_lpuart0>;
+};
-- 
2.7.4

[PATCH V6 2/3] firmware: imx: add SCU firmware driver support

[Dong Aisheng]

The System Controller Firmware (SCFW) is a low-level system function
which runs on a dedicated Cortex-M core to provide power, clock, and
resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
(QM, QP), and i.MX8QX (QXP, DX).

This patch implements the SCU firmware IPC function and the common
message sending API sc_call_rpc.

Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v5->v6:
 * remove resource management (sc_ipc_open/close)
 * make sc_call_rpc and related structure visible by client drivers,
   so remove internal headfile drivers/soc/imx/sc/main/rpc.h accordingly
 * move scu firmware driver under drivers/firmware/imx
 * patch title changed
v4->v5:
 * switch to new generic MU binding.
   Use 8 separate mu channels in one MU instance for SCU communication
 * create struct sc_rpc_msg to separate the msg header and service,
   accordingly the old sc_rpc_msg_s with raw data union is removed.
   This can gain better readability.
 * remove defines like RPC_XXX(MSG)
 * remove unused types
 * headfiles cleanup
 * NOTE:
   With the new approach that uses 8 separate irq driven changes, i still
   did not find a clean way to better support receiving msg over 4 words.
   So the current driver does not support it.
   As in current SCU protocol, there's only a minor of commands need
   receiving msg over 4 words which is still not used by Linux, so it does
   not affect the normal function.
 * Know issue:
   The performance drops a lot after using 8 separate interrupt driven MUs
   to send/receive msgs.
   e.g. Sending a scu message with tx size 2 words and rx size 2 words:
   Former (polling) : < 10us to handle a SCU msg
   Now (irq) : 20~30 us to handle a SCU msg (Caused by interrupt latency)
v3->v4:
 * change to use mailbox
 * separate the IPC part and RPC API for easy review
 * headfiles cleanup
v2->v3:
 * add the ipc read/write error check
v1->v2:
 * change the type of sc_ipc_t from uint32_t to unsigned long.
   This can make it be capable of storing 64 bit pointer in ARMv8 system.
 * Update to use the new MU library implemenation (handle iomem privately)
 * remove unused delcarations e.g. sc_rpc_dispatch and sc_rpc_xlate.
 * remove unneeded pad ctl functions
---
 drivers/firmware/Kconfig       |   1 +
 drivers/firmware/imx/Kconfig   |  11 +
 drivers/firmware/imx/Makefile  |   2 +
 drivers/firmware/imx/imx-scu.c | 223 +++++++++++++++
 include/soc/imx/scu/ipc.h      |  59 ++++
 include/soc/imx/scu/sci.h      |  16 ++
 include/soc/imx/scu/types.h    | 636 +++++++++++++++++++++++++++++++++++++++++
 7 files changed, 948 insertions(+)
 create mode 100644 drivers/firmware/imx/Kconfig
 create mode 100644 drivers/firmware/imx/Makefile
 create mode 100644 drivers/firmware/imx/imx-scu.c
 create mode 100644 include/soc/imx/scu/ipc.h
 create mode 100644 include/soc/imx/scu/sci.h
 create mode 100644 include/soc/imx/scu/types.h

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 6e83880..bd9e4e2 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -289,6 +289,7 @@ config HAVE_ARM_SMCCC
 source "drivers/firmware/broadcom/Kconfig"
 source "drivers/firmware/google/Kconfig"
 source "drivers/firmware/efi/Kconfig"
+source "drivers/firmware/imx/Kconfig"
 source "drivers/firmware/meson/Kconfig"
 source "drivers/firmware/tegra/Kconfig"
 
diff --git a/drivers/firmware/imx/Kconfig b/drivers/firmware/imx/Kconfig
new file mode 100644
index 0000000..b170c28
--- /dev/null
+++ b/drivers/firmware/imx/Kconfig
@@ -0,0 +1,11 @@
+config IMX_SCU
+	bool "IMX SCU Protocol driver"
+	depends on IMX_MBOX
+	help
+	  The System Controller Firmware (SCFW) is a low-level system function
+	  which runs on a dedicated Cortex-M core to provide power, clock, and
+	  resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
+	  (QM, QP), and i.MX8QX (QXP, DX).
+
+	  This driver manages the IPC interface between host CPU and the
+	  SCU firmware running on M4.
diff --git a/drivers/firmware/imx/Makefile b/drivers/firmware/imx/Makefile
new file mode 100644
index 0000000..9b1e2fe
--- /dev/null
+++ b/drivers/firmware/imx/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_IMX_SCU)	+= imx-scu.o
diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
new file mode 100644
index 0000000..25e7bfe
--- /dev/null
+++ b/drivers/firmware/imx/imx-scu.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 NXP
+ *  Author: Dong Aisheng <aisheng.dong@nxp.com>
+ *
+ * Implementation of the IPC functions using MUs (client side).
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#include <soc/imx/scu/types.h>
+#include <soc/imx/scu/ipc.h>
+
+#define SCU_MU_CHAN_NUM		8
+#define MAX_RX_TIMEOUT		(msecs_to_jiffies(30))
+
+struct sc_chan {
+	struct sc_ipc *sc_ipc;
+
+	struct mbox_client cl;
+	struct mbox_chan *ch;
+	int idx;
+};
+
+struct sc_ipc {
+	/* SCU uses 4 Tx and 4 Rx channels */
+	struct sc_chan chans[SCU_MU_CHAN_NUM];
+	struct device *dev;
+	struct mutex lock;
+	struct completion done;
+
+	/* temporarily store the SCU msg */
+	u32 *msg;
+	u8 rx_size;
+	u8 count;
+};
+
+static struct sc_ipc *scu_ipc_handle;
+
+/*
+ * Get the default handle used by SCU
+ */
+int sc_ipc_get_handle(struct sc_ipc *ipc)
+{
+	if (!scu_ipc_handle)
+		return -EPROBE_DEFER;
+
+	ipc = scu_ipc_handle;
+	return 0;
+}
+EXPORT_SYMBOL(sc_ipc_get_handle);
+
+static void sc_rx_callback(struct mbox_client *c, void *msg)
+{
+	struct sc_chan *sc_chan = container_of(c, struct sc_chan, cl);
+	struct sc_ipc *sc_ipc = sc_chan->sc_ipc;
+	struct sc_rpc_msg *hdr;
+	u32 *data = msg;
+
+	if (sc_chan->idx == 0) {
+		hdr = msg;
+		sc_ipc->rx_size = hdr->size;
+		dev_dbg(sc_ipc->dev, "msg rx size %u\n", sc_ipc->rx_size);
+		if (sc_ipc->rx_size > 4)
+			dev_warn(sc_ipc->dev, "RPC does not support receiving over 4 words: %u\n",
+				 sc_ipc->rx_size);
+	}
+
+	sc_ipc->msg[sc_chan->idx] = *data;
+	sc_ipc->count++;
+
+	dev_dbg(sc_ipc->dev, "mu %u msg %u 0x%x\n", sc_chan->idx,
+		sc_ipc->count, *data);
+
+	if ((sc_ipc->rx_size != 0) && (sc_ipc->count == sc_ipc->rx_size))
+		complete(&sc_ipc->done);
+}
+
+int sc_ipc_write(struct sc_ipc *sc_ipc, void *msg)
+{
+	struct sc_rpc_msg *hdr = msg;
+	struct sc_chan *sc_chan;
+	u32 *data = msg;
+	int ret;
+	int i;
+
+	/* Check size */
+	if (hdr->size > SC_RPC_MAX_MSG)
+		return -EINVAL;
+
+	dev_dbg(sc_ipc->dev, "RPC SVC %u FUNC %u SIZE %u\n", hdr->svc,
+		hdr->func, hdr->size);
+
+	for (i = 0; i < hdr->size; i++) {
+		sc_chan = &sc_ipc->chans[i % 4];
+		ret = mbox_send_message(sc_chan->ch, &data[i]);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+/*
+ * RPC command/response
+ */
+int sc_call_rpc(struct sc_ipc *sc_ipc, void *msg, bool no_resp)
+{
+	int ret;
+
+	if (WARN_ON(!sc_ipc || !msg))
+		return -EINVAL;
+
+	mutex_lock(&sc_ipc->lock);
+	reinit_completion(&sc_ipc->done);
+
+	sc_ipc->msg = msg;
+	sc_ipc->count = 0;
+	ret = sc_ipc_write(sc_ipc, msg);
+	if (ret < 0) {
+		dev_err(sc_ipc->dev, "RPC send msg failed: %d\n", ret);
+		goto out;
+	}
+
+	if (!no_resp) {
+		if (!wait_for_completion_timeout(&sc_ipc->done,
+						 MAX_RX_TIMEOUT)) {
+			dev_err(sc_ipc->dev, "RPC send msg timeout\n");
+			return -ETIMEDOUT;
+		}
+		ret = 0;
+	}
+out:
+	mutex_unlock(&sc_ipc->lock);
+
+	dev_dbg(sc_ipc->dev, "RPC SVC done\n");
+
+	return ret;
+}
+
+static int imx_sc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct sc_ipc *sc_ipc;
+	struct sc_chan *sc_chan;
+	struct mbox_client *cl;
+	char *chan_name;
+	int ret;
+	int i;
+
+	sc_ipc = devm_kzalloc(dev, sizeof(*sc_ipc), GFP_KERNEL);
+	if (!sc_ipc)
+		return -ENOMEM;
+
+	for (i = 0; i < SCU_MU_CHAN_NUM; i++) {
+		if (i < 4)
+			chan_name = kasprintf(GFP_KERNEL, "tx%d", i);
+		else
+			chan_name = kasprintf(GFP_KERNEL, "rx%d", i - 4);
+
+		if (!chan_name)
+			return -ENOMEM;
+
+		sc_chan = &sc_ipc->chans[i];
+		cl = &sc_chan->cl;
+		cl->dev = dev;
+		cl->tx_block = false;
+		cl->knows_txdone = true;
+		cl->rx_callback = sc_rx_callback;
+
+		sc_chan->sc_ipc = sc_ipc;
+		sc_chan->idx = i % 4;
+		sc_chan->ch = mbox_request_channel_byname(cl, chan_name);
+		if (IS_ERR(sc_chan->ch)) {
+			ret = PTR_ERR(sc_chan->ch);
+			if (ret != -EPROBE_DEFER)
+				dev_err(dev, "Failed to request mbox chan %s ret %d\n",
+					chan_name, ret);
+			return ret;
+		}
+
+		dev_dbg(dev, "request mbox chan %s\n", chan_name);
+		/* chan_name is not used anymore by framework */
+		kfree(chan_name);
+	}
+
+	sc_ipc->dev = dev;
+	mutex_init(&sc_ipc->lock);
+	init_completion(&sc_ipc->done);
+
+	scu_ipc_handle = sc_ipc;
+
+	pr_info("NXP i.MX SCU Initialized\n");
+
+	return devm_of_platform_populate(dev);
+}
+
+static const struct of_device_id imx_sc_match[] = {
+	{ .compatible = "fsl,imx-scu", },
+	{ /* Sentinel */ }
+};
+
+static struct platform_driver imx_sc_driver = {
+	.driver = {
+		.name = "imx-scu",
+		.of_match_table = imx_sc_match,
+	},
+	.probe = imx_sc_probe,
+};
+builtin_platform_driver(imx_sc_driver);
+
+MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
+MODULE_DESCRIPTION("IMX SCU firmware protocol driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/soc/imx/scu/ipc.h b/include/soc/imx/scu/ipc.h
new file mode 100644
index 0000000..cc10d5a
--- /dev/null
+++ b/include/soc/imx/scu/ipc.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2018 NXP
+ *
+ * Header file for the IPC implementation.
+ */
+
+#ifndef _SC_IPC_H
+#define _SC_IPC_H
+
+#include <linux/device.h>
+#include <linux/types.h>
+
+#define SC_RPC_VERSION		1
+#define SC_RPC_MAX_MSG		8
+
+struct sc_ipc;
+
+enum sc_rpc_svc_e {
+	SC_RPC_SVC_UNKNOWN = 0,
+	SC_RPC_SVC_RETURN = 1,
+	SC_RPC_SVC_PM = 2,
+	SC_RPC_SVC_RM = 3,
+	SC_RPC_SVC_TIMER = 5,
+	SC_RPC_SVC_PAD = 6,
+	SC_RPC_SVC_MISC = 7,
+	SC_RPC_SVC_IRQ = 8,
+	SC_RPC_SVC_ABORT = 9
+};
+
+struct sc_rpc_msg {
+	uint8_t ver;
+	uint8_t size;
+	uint8_t svc;
+	uint8_t func;
+};
+
+/*
+ * This is an function to send an RPC message over an IPC channel.
+ * It is called by client-side SCFW API function shims.
+ *
+ * @param[in]     ipc         IPC handle
+ * @param[in,out] msg         handle to a message
+ * @param[in]     no_resp     response flag
+ *
+ * If no_resp is false then this function waits for a response
+ * and returns the result in msg.
+ */
+int sc_call_rpc(struct sc_ipc *ipc, void *msg, bool no_resp);
+
+/*
+ * This function gets the default ipc handle used by SCU
+ *
+ * @param[out]	ipc	sc ipc handle
+ *
+ * @return Returns an error code (0 = success, failed if < 0)
+ */
+int sc_ipc_get_handle(struct sc_ipc *ipc);
+#endif /* _SC_IPC_H */
diff --git a/include/soc/imx/scu/sci.h b/include/soc/imx/scu/sci.h
new file mode 100644
index 0000000..e0657d3
--- /dev/null
+++ b/include/soc/imx/scu/sci.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017~2018 NXP
+ *
+ * Header file containing the public System Controller Interface (SCI)
+ * definitions.
+ */
+
+#ifndef _SC_SCI_H
+#define _SC_SCI_H
+
+#include <soc/imx/scu/ipc.h>
+#include <soc/imx/scu/types.h>
+
+#endif /* _SC_SCI_H */
diff --git a/include/soc/imx/scu/types.h b/include/soc/imx/scu/types.h
new file mode 100644
index 0000000..e56265e
--- /dev/null
+++ b/include/soc/imx/scu/types.h
@@ -0,0 +1,636 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017~2018 NXP
+ *
+ * Header file containing types used across multiple service APIs.
+ */
+
+#ifndef _SC_TYPES_H
+#define _SC_TYPES_H
+
+/*
+ * This type is used to indicate error response for most functions.
+ */
+typedef enum sc_err_e {
+	SC_ERR_NONE = 0,	/* Success */
+	SC_ERR_VERSION = 1,	/* Incompatible API version */
+	SC_ERR_CONFIG = 2,	/* Configuration error */
+	SC_ERR_PARM = 3,	/* Bad parameter */
+	SC_ERR_NOACCESS = 4,	/* Permission error (no access) */
+	SC_ERR_LOCKED = 5,	/* Permission error (locked) */
+	SC_ERR_UNAVAILABLE = 6,	/* Unavailable (out of resources) */
+	SC_ERR_NOTFOUND = 7,	/* Not found */
+	SC_ERR_NOPOWER = 8,	/* No power */
+	SC_ERR_IPC = 9,		/* Generic IPC error */
+	SC_ERR_BUSY = 10,	/* Resource is currently busy/active */
+	SC_ERR_FAIL = 11,	/* General I/O failure */
+	SC_ERR_LAST
+} sc_err_t;
+
+/*
+ * This type is used to indicate a resource. Resources include peripherals
+ * and bus masters (but not memory regions). Note items from list should
+ * never be changed or removed (only added to at the end of the list).
+ */
+typedef enum sc_rsrc_e {
+	SC_R_A53 = 0,
+	SC_R_A53_0 = 1,
+	SC_R_A53_1 = 2,
+	SC_R_A53_2 = 3,
+	SC_R_A53_3 = 4,
+	SC_R_A72 = 5,
+	SC_R_A72_0 = 6,
+	SC_R_A72_1 = 7,
+	SC_R_A72_2 = 8,
+	SC_R_A72_3 = 9,
+	SC_R_CCI = 10,
+	SC_R_DB = 11,
+	SC_R_DRC_0 = 12,
+	SC_R_DRC_1 = 13,
+	SC_R_GIC_SMMU = 14,
+	SC_R_IRQSTR_M4_0 = 15,
+	SC_R_IRQSTR_M4_1 = 16,
+	SC_R_SMMU = 17,
+	SC_R_GIC = 18,
+	SC_R_DC_0_BLIT0 = 19,
+	SC_R_DC_0_BLIT1 = 20,
+	SC_R_DC_0_BLIT2 = 21,
+	SC_R_DC_0_BLIT_OUT = 22,
+	SC_R_DC_0_CAPTURE0 = 23,
+	SC_R_DC_0_CAPTURE1 = 24,
+	SC_R_DC_0_WARP = 25,
+	SC_R_DC_0_INTEGRAL0 = 26,
+	SC_R_DC_0_INTEGRAL1 = 27,
+	SC_R_DC_0_VIDEO0 = 28,
+	SC_R_DC_0_VIDEO1 = 29,
+	SC_R_DC_0_FRAC0 = 30,
+	SC_R_DC_0_FRAC1 = 31,
+	SC_R_DC_0 = 32,
+	SC_R_GPU_2_PID0 = 33,
+	SC_R_DC_0_PLL_0 = 34,
+	SC_R_DC_0_PLL_1 = 35,
+	SC_R_DC_1_BLIT0 = 36,
+	SC_R_DC_1_BLIT1 = 37,
+	SC_R_DC_1_BLIT2 = 38,
+	SC_R_DC_1_BLIT_OUT = 39,
+	SC_R_DC_1_CAPTURE0 = 40,
+	SC_R_DC_1_CAPTURE1 = 41,
+	SC_R_DC_1_WARP = 42,
+	SC_R_DC_1_INTEGRAL0 = 43,
+	SC_R_DC_1_INTEGRAL1 = 44,
+	SC_R_DC_1_VIDEO0 = 45,
+	SC_R_DC_1_VIDEO1 = 46,
+	SC_R_DC_1_FRAC0 = 47,
+	SC_R_DC_1_FRAC1 = 48,
+	SC_R_DC_1 = 49,
+	SC_R_GPU_3_PID0 = 50,
+	SC_R_DC_1_PLL_0 = 51,
+	SC_R_DC_1_PLL_1 = 52,
+	SC_R_SPI_0 = 53,
+	SC_R_SPI_1 = 54,
+	SC_R_SPI_2 = 55,
+	SC_R_SPI_3 = 56,
+	SC_R_UART_0 = 57,
+	SC_R_UART_1 = 58,
+	SC_R_UART_2 = 59,
+	SC_R_UART_3 = 60,
+	SC_R_UART_4 = 61,
+	SC_R_EMVSIM_0 = 62,
+	SC_R_EMVSIM_1 = 63,
+	SC_R_DMA_0_CH0 = 64,
+	SC_R_DMA_0_CH1 = 65,
+	SC_R_DMA_0_CH2 = 66,
+	SC_R_DMA_0_CH3 = 67,
+	SC_R_DMA_0_CH4 = 68,
+	SC_R_DMA_0_CH5 = 69,
+	SC_R_DMA_0_CH6 = 70,
+	SC_R_DMA_0_CH7 = 71,
+	SC_R_DMA_0_CH8 = 72,
+	SC_R_DMA_0_CH9 = 73,
+	SC_R_DMA_0_CH10 = 74,
+	SC_R_DMA_0_CH11 = 75,
+	SC_R_DMA_0_CH12 = 76,
+	SC_R_DMA_0_CH13 = 77,
+	SC_R_DMA_0_CH14 = 78,
+	SC_R_DMA_0_CH15 = 79,
+	SC_R_DMA_0_CH16 = 80,
+	SC_R_DMA_0_CH17 = 81,
+	SC_R_DMA_0_CH18 = 82,
+	SC_R_DMA_0_CH19 = 83,
+	SC_R_DMA_0_CH20 = 84,
+	SC_R_DMA_0_CH21 = 85,
+	SC_R_DMA_0_CH22 = 86,
+	SC_R_DMA_0_CH23 = 87,
+	SC_R_DMA_0_CH24 = 88,
+	SC_R_DMA_0_CH25 = 89,
+	SC_R_DMA_0_CH26 = 90,
+	SC_R_DMA_0_CH27 = 91,
+	SC_R_DMA_0_CH28 = 92,
+	SC_R_DMA_0_CH29 = 93,
+	SC_R_DMA_0_CH30 = 94,
+	SC_R_DMA_0_CH31 = 95,
+	SC_R_I2C_0 = 96,
+	SC_R_I2C_1 = 97,
+	SC_R_I2C_2 = 98,
+	SC_R_I2C_3 = 99,
+	SC_R_I2C_4 = 100,
+	SC_R_ADC_0 = 101,
+	SC_R_ADC_1 = 102,
+	SC_R_FTM_0 = 103,
+	SC_R_FTM_1 = 104,
+	SC_R_CAN_0 = 105,
+	SC_R_CAN_1 = 106,
+	SC_R_CAN_2 = 107,
+	SC_R_DMA_1_CH0 = 108,
+	SC_R_DMA_1_CH1 = 109,
+	SC_R_DMA_1_CH2 = 110,
+	SC_R_DMA_1_CH3 = 111,
+	SC_R_DMA_1_CH4 = 112,
+	SC_R_DMA_1_CH5 = 113,
+	SC_R_DMA_1_CH6 = 114,
+	SC_R_DMA_1_CH7 = 115,
+	SC_R_DMA_1_CH8 = 116,
+	SC_R_DMA_1_CH9 = 117,
+	SC_R_DMA_1_CH10 = 118,
+	SC_R_DMA_1_CH11 = 119,
+	SC_R_DMA_1_CH12 = 120,
+	SC_R_DMA_1_CH13 = 121,
+	SC_R_DMA_1_CH14 = 122,
+	SC_R_DMA_1_CH15 = 123,
+	SC_R_DMA_1_CH16 = 124,
+	SC_R_DMA_1_CH17 = 125,
+	SC_R_DMA_1_CH18 = 126,
+	SC_R_DMA_1_CH19 = 127,
+	SC_R_DMA_1_CH20 = 128,
+	SC_R_DMA_1_CH21 = 129,
+	SC_R_DMA_1_CH22 = 130,
+	SC_R_DMA_1_CH23 = 131,
+	SC_R_DMA_1_CH24 = 132,
+	SC_R_DMA_1_CH25 = 133,
+	SC_R_DMA_1_CH26 = 134,
+	SC_R_DMA_1_CH27 = 135,
+	SC_R_DMA_1_CH28 = 136,
+	SC_R_DMA_1_CH29 = 137,
+	SC_R_DMA_1_CH30 = 138,
+	SC_R_DMA_1_CH31 = 139,
+	SC_R_UNUSED1 = 140,
+	SC_R_UNUSED2 = 141,
+	SC_R_UNUSED3 = 142,
+	SC_R_UNUSED4 = 143,
+	SC_R_GPU_0_PID0 = 144,
+	SC_R_GPU_0_PID1 = 145,
+	SC_R_GPU_0_PID2 = 146,
+	SC_R_GPU_0_PID3 = 147,
+	SC_R_GPU_1_PID0 = 148,
+	SC_R_GPU_1_PID1 = 149,
+	SC_R_GPU_1_PID2 = 150,
+	SC_R_GPU_1_PID3 = 151,
+	SC_R_PCIE_A = 152,
+	SC_R_SERDES_0 = 153,
+	SC_R_MATCH_0 = 154,
+	SC_R_MATCH_1 = 155,
+	SC_R_MATCH_2 = 156,
+	SC_R_MATCH_3 = 157,
+	SC_R_MATCH_4 = 158,
+	SC_R_MATCH_5 = 159,
+	SC_R_MATCH_6 = 160,
+	SC_R_MATCH_7 = 161,
+	SC_R_MATCH_8 = 162,
+	SC_R_MATCH_9 = 163,
+	SC_R_MATCH_10 = 164,
+	SC_R_MATCH_11 = 165,
+	SC_R_MATCH_12 = 166,
+	SC_R_MATCH_13 = 167,
+	SC_R_MATCH_14 = 168,
+	SC_R_PCIE_B = 169,
+	SC_R_SATA_0 = 170,
+	SC_R_SERDES_1 = 171,
+	SC_R_HSIO_GPIO = 172,
+	SC_R_MATCH_15 = 173,
+	SC_R_MATCH_16 = 174,
+	SC_R_MATCH_17 = 175,
+	SC_R_MATCH_18 = 176,
+	SC_R_MATCH_19 = 177,
+	SC_R_MATCH_20 = 178,
+	SC_R_MATCH_21 = 179,
+	SC_R_MATCH_22 = 180,
+	SC_R_MATCH_23 = 181,
+	SC_R_MATCH_24 = 182,
+	SC_R_MATCH_25 = 183,
+	SC_R_MATCH_26 = 184,
+	SC_R_MATCH_27 = 185,
+	SC_R_MATCH_28 = 186,
+	SC_R_LCD_0 = 187,
+	SC_R_LCD_0_PWM_0 = 188,
+	SC_R_LCD_0_I2C_0 = 189,
+	SC_R_LCD_0_I2C_1 = 190,
+	SC_R_PWM_0 = 191,
+	SC_R_PWM_1 = 192,
+	SC_R_PWM_2 = 193,
+	SC_R_PWM_3 = 194,
+	SC_R_PWM_4 = 195,
+	SC_R_PWM_5 = 196,
+	SC_R_PWM_6 = 197,
+	SC_R_PWM_7 = 198,
+	SC_R_GPIO_0 = 199,
+	SC_R_GPIO_1 = 200,
+	SC_R_GPIO_2 = 201,
+	SC_R_GPIO_3 = 202,
+	SC_R_GPIO_4 = 203,
+	SC_R_GPIO_5 = 204,
+	SC_R_GPIO_6 = 205,
+	SC_R_GPIO_7 = 206,
+	SC_R_GPT_0 = 207,
+	SC_R_GPT_1 = 208,
+	SC_R_GPT_2 = 209,
+	SC_R_GPT_3 = 210,
+	SC_R_GPT_4 = 211,
+	SC_R_KPP = 212,
+	SC_R_MU_0A = 213,
+	SC_R_MU_1A = 214,
+	SC_R_MU_2A = 215,
+	SC_R_MU_3A = 216,
+	SC_R_MU_4A = 217,
+	SC_R_MU_5A = 218,
+	SC_R_MU_6A = 219,
+	SC_R_MU_7A = 220,
+	SC_R_MU_8A = 221,
+	SC_R_MU_9A = 222,
+	SC_R_MU_10A = 223,
+	SC_R_MU_11A = 224,
+	SC_R_MU_12A = 225,
+	SC_R_MU_13A = 226,
+	SC_R_MU_5B = 227,
+	SC_R_MU_6B = 228,
+	SC_R_MU_7B = 229,
+	SC_R_MU_8B = 230,
+	SC_R_MU_9B = 231,
+	SC_R_MU_10B = 232,
+	SC_R_MU_11B = 233,
+	SC_R_MU_12B = 234,
+	SC_R_MU_13B = 235,
+	SC_R_ROM_0 = 236,
+	SC_R_FSPI_0 = 237,
+	SC_R_FSPI_1 = 238,
+	SC_R_IEE = 239,
+	SC_R_IEE_R0 = 240,
+	SC_R_IEE_R1 = 241,
+	SC_R_IEE_R2 = 242,
+	SC_R_IEE_R3 = 243,
+	SC_R_IEE_R4 = 244,
+	SC_R_IEE_R5 = 245,
+	SC_R_IEE_R6 = 246,
+	SC_R_IEE_R7 = 247,
+	SC_R_SDHC_0 = 248,
+	SC_R_SDHC_1 = 249,
+	SC_R_SDHC_2 = 250,
+	SC_R_ENET_0 = 251,
+	SC_R_ENET_1 = 252,
+	SC_R_MLB_0 = 253,
+	SC_R_DMA_2_CH0 = 254,
+	SC_R_DMA_2_CH1 = 255,
+	SC_R_DMA_2_CH2 = 256,
+	SC_R_DMA_2_CH3 = 257,
+	SC_R_DMA_2_CH4 = 258,
+	SC_R_USB_0 = 259,
+	SC_R_USB_1 = 260,
+	SC_R_USB_0_PHY = 261,
+	SC_R_USB_2 = 262,
+	SC_R_USB_2_PHY = 263,
+	SC_R_DTCP = 264,
+	SC_R_NAND = 265,
+	SC_R_LVDS_0 = 266,
+	SC_R_LVDS_0_PWM_0 = 267,
+	SC_R_LVDS_0_I2C_0 = 268,
+	SC_R_LVDS_0_I2C_1 = 269,
+	SC_R_LVDS_1 = 270,
+	SC_R_LVDS_1_PWM_0 = 271,
+	SC_R_LVDS_1_I2C_0 = 272,
+	SC_R_LVDS_1_I2C_1 = 273,
+	SC_R_LVDS_2 = 274,
+	SC_R_LVDS_2_PWM_0 = 275,
+	SC_R_LVDS_2_I2C_0 = 276,
+	SC_R_LVDS_2_I2C_1 = 277,
+	SC_R_M4_0_PID0 = 278,
+	SC_R_M4_0_PID1 = 279,
+	SC_R_M4_0_PID2 = 280,
+	SC_R_M4_0_PID3 = 281,
+	SC_R_M4_0_PID4 = 282,
+	SC_R_M4_0_RGPIO = 283,
+	SC_R_M4_0_SEMA42 = 284,
+	SC_R_M4_0_TPM = 285,
+	SC_R_M4_0_PIT = 286,
+	SC_R_M4_0_UART = 287,
+	SC_R_M4_0_I2C = 288,
+	SC_R_M4_0_INTMUX = 289,
+	SC_R_M4_0_SIM = 290,
+	SC_R_M4_0_WDOG = 291,
+	SC_R_M4_0_MU_0B = 292,
+	SC_R_M4_0_MU_0A0 = 293,
+	SC_R_M4_0_MU_0A1 = 294,
+	SC_R_M4_0_MU_0A2 = 295,
+	SC_R_M4_0_MU_0A3 = 296,
+	SC_R_M4_0_MU_1A = 297,
+	SC_R_M4_1_PID0 = 298,
+	SC_R_M4_1_PID1 = 299,
+	SC_R_M4_1_PID2 = 300,
+	SC_R_M4_1_PID3 = 301,
+	SC_R_M4_1_PID4 = 302,
+	SC_R_M4_1_RGPIO = 303,
+	SC_R_M4_1_SEMA42 = 304,
+	SC_R_M4_1_TPM = 305,
+	SC_R_M4_1_PIT = 306,
+	SC_R_M4_1_UART = 307,
+	SC_R_M4_1_I2C = 308,
+	SC_R_M4_1_INTMUX = 309,
+	SC_R_M4_1_SIM = 310,
+	SC_R_M4_1_WDOG = 311,
+	SC_R_M4_1_MU_0B = 312,
+	SC_R_M4_1_MU_0A0 = 313,
+	SC_R_M4_1_MU_0A1 = 314,
+	SC_R_M4_1_MU_0A2 = 315,
+	SC_R_M4_1_MU_0A3 = 316,
+	SC_R_M4_1_MU_1A = 317,
+	SC_R_SAI_0 = 318,
+	SC_R_SAI_1 = 319,
+	SC_R_SAI_2 = 320,
+	SC_R_IRQSTR_SCU2 = 321,
+	SC_R_IRQSTR_DSP = 322,
+	SC_R_UNUSED5 = 323,
+	SC_R_UNUSED6 = 324,
+	SC_R_AUDIO_PLL_0 = 325,
+	SC_R_PI_0 = 326,
+	SC_R_PI_0_PWM_0 = 327,
+	SC_R_PI_0_PWM_1 = 328,
+	SC_R_PI_0_I2C_0 = 329,
+	SC_R_PI_0_PLL = 330,
+	SC_R_PI_1 = 331,
+	SC_R_PI_1_PWM_0 = 332,
+	SC_R_PI_1_PWM_1 = 333,
+	SC_R_PI_1_I2C_0 = 334,
+	SC_R_PI_1_PLL = 335,
+	SC_R_SC_PID0 = 336,
+	SC_R_SC_PID1 = 337,
+	SC_R_SC_PID2 = 338,
+	SC_R_SC_PID3 = 339,
+	SC_R_SC_PID4 = 340,
+	SC_R_SC_SEMA42 = 341,
+	SC_R_SC_TPM = 342,
+	SC_R_SC_PIT = 343,
+	SC_R_SC_UART = 344,
+	SC_R_SC_I2C = 345,
+	SC_R_SC_MU_0B = 346,
+	SC_R_SC_MU_0A0 = 347,
+	SC_R_SC_MU_0A1 = 348,
+	SC_R_SC_MU_0A2 = 349,
+	SC_R_SC_MU_0A3 = 350,
+	SC_R_SC_MU_1A = 351,
+	SC_R_SYSCNT_RD = 352,
+	SC_R_SYSCNT_CMP = 353,
+	SC_R_DEBUG = 354,
+	SC_R_SYSTEM = 355,
+	SC_R_SNVS = 356,
+	SC_R_OTP = 357,
+	SC_R_VPU_PID0 = 358,
+	SC_R_VPU_PID1 = 359,
+	SC_R_VPU_PID2 = 360,
+	SC_R_VPU_PID3 = 361,
+	SC_R_VPU_PID4 = 362,
+	SC_R_VPU_PID5 = 363,
+	SC_R_VPU_PID6 = 364,
+	SC_R_VPU_PID7 = 365,
+	SC_R_VPU_UART = 366,
+	SC_R_VPUCORE = 367,
+	SC_R_VPUCORE_0 = 368,
+	SC_R_VPUCORE_1 = 369,
+	SC_R_VPUCORE_2 = 370,
+	SC_R_VPUCORE_3 = 371,
+	SC_R_DMA_4_CH0 = 372,
+	SC_R_DMA_4_CH1 = 373,
+	SC_R_DMA_4_CH2 = 374,
+	SC_R_DMA_4_CH3 = 375,
+	SC_R_DMA_4_CH4 = 376,
+	SC_R_ISI_CH0 = 377,
+	SC_R_ISI_CH1 = 378,
+	SC_R_ISI_CH2 = 379,
+	SC_R_ISI_CH3 = 380,
+	SC_R_ISI_CH4 = 381,
+	SC_R_ISI_CH5 = 382,
+	SC_R_ISI_CH6 = 383,
+	SC_R_ISI_CH7 = 384,
+	SC_R_MJPEG_DEC_S0 = 385,
+	SC_R_MJPEG_DEC_S1 = 386,
+	SC_R_MJPEG_DEC_S2 = 387,
+	SC_R_MJPEG_DEC_S3 = 388,
+	SC_R_MJPEG_ENC_S0 = 389,
+	SC_R_MJPEG_ENC_S1 = 390,
+	SC_R_MJPEG_ENC_S2 = 391,
+	SC_R_MJPEG_ENC_S3 = 392,
+	SC_R_MIPI_0 = 393,
+	SC_R_MIPI_0_PWM_0 = 394,
+	SC_R_MIPI_0_I2C_0 = 395,
+	SC_R_MIPI_0_I2C_1 = 396,
+	SC_R_MIPI_1 = 397,
+	SC_R_MIPI_1_PWM_0 = 398,
+	SC_R_MIPI_1_I2C_0 = 399,
+	SC_R_MIPI_1_I2C_1 = 400,
+	SC_R_CSI_0 = 401,
+	SC_R_CSI_0_PWM_0 = 402,
+	SC_R_CSI_0_I2C_0 = 403,
+	SC_R_CSI_1 = 404,
+	SC_R_CSI_1_PWM_0 = 405,
+	SC_R_CSI_1_I2C_0 = 406,
+	SC_R_HDMI = 407,
+	SC_R_HDMI_I2S = 408,
+	SC_R_HDMI_I2C_0 = 409,
+	SC_R_HDMI_PLL_0 = 410,
+	SC_R_HDMI_RX = 411,
+	SC_R_HDMI_RX_BYPASS = 412,
+	SC_R_HDMI_RX_I2C_0 = 413,
+	SC_R_ASRC_0 = 414,
+	SC_R_ESAI_0 = 415,
+	SC_R_SPDIF_0 = 416,
+	SC_R_SPDIF_1 = 417,
+	SC_R_SAI_3 = 418,
+	SC_R_SAI_4 = 419,
+	SC_R_SAI_5 = 420,
+	SC_R_GPT_5 = 421,
+	SC_R_GPT_6 = 422,
+	SC_R_GPT_7 = 423,
+	SC_R_GPT_8 = 424,
+	SC_R_GPT_9 = 425,
+	SC_R_GPT_10 = 426,
+	SC_R_DMA_2_CH5 = 427,
+	SC_R_DMA_2_CH6 = 428,
+	SC_R_DMA_2_CH7 = 429,
+	SC_R_DMA_2_CH8 = 430,
+	SC_R_DMA_2_CH9 = 431,
+	SC_R_DMA_2_CH10 = 432,
+	SC_R_DMA_2_CH11 = 433,
+	SC_R_DMA_2_CH12 = 434,
+	SC_R_DMA_2_CH13 = 435,
+	SC_R_DMA_2_CH14 = 436,
+	SC_R_DMA_2_CH15 = 437,
+	SC_R_DMA_2_CH16 = 438,
+	SC_R_DMA_2_CH17 = 439,
+	SC_R_DMA_2_CH18 = 440,
+	SC_R_DMA_2_CH19 = 441,
+	SC_R_DMA_2_CH20 = 442,
+	SC_R_DMA_2_CH21 = 443,
+	SC_R_DMA_2_CH22 = 444,
+	SC_R_DMA_2_CH23 = 445,
+	SC_R_DMA_2_CH24 = 446,
+	SC_R_DMA_2_CH25 = 447,
+	SC_R_DMA_2_CH26 = 448,
+	SC_R_DMA_2_CH27 = 449,
+	SC_R_DMA_2_CH28 = 450,
+	SC_R_DMA_2_CH29 = 451,
+	SC_R_DMA_2_CH30 = 452,
+	SC_R_DMA_2_CH31 = 453,
+	SC_R_ASRC_1 = 454,
+	SC_R_ESAI_1 = 455,
+	SC_R_SAI_6 = 456,
+	SC_R_SAI_7 = 457,
+	SC_R_AMIX = 458,
+	SC_R_MQS_0 = 459,
+	SC_R_DMA_3_CH0 = 460,
+	SC_R_DMA_3_CH1 = 461,
+	SC_R_DMA_3_CH2 = 462,
+	SC_R_DMA_3_CH3 = 463,
+	SC_R_DMA_3_CH4 = 464,
+	SC_R_DMA_3_CH5 = 465,
+	SC_R_DMA_3_CH6 = 466,
+	SC_R_DMA_3_CH7 = 467,
+	SC_R_DMA_3_CH8 = 468,
+	SC_R_DMA_3_CH9 = 469,
+	SC_R_DMA_3_CH10 = 470,
+	SC_R_DMA_3_CH11 = 471,
+	SC_R_DMA_3_CH12 = 472,
+	SC_R_DMA_3_CH13 = 473,
+	SC_R_DMA_3_CH14 = 474,
+	SC_R_DMA_3_CH15 = 475,
+	SC_R_DMA_3_CH16 = 476,
+	SC_R_DMA_3_CH17 = 477,
+	SC_R_DMA_3_CH18 = 478,
+	SC_R_DMA_3_CH19 = 479,
+	SC_R_DMA_3_CH20 = 480,
+	SC_R_DMA_3_CH21 = 481,
+	SC_R_DMA_3_CH22 = 482,
+	SC_R_DMA_3_CH23 = 483,
+	SC_R_DMA_3_CH24 = 484,
+	SC_R_DMA_3_CH25 = 485,
+	SC_R_DMA_3_CH26 = 486,
+	SC_R_DMA_3_CH27 = 487,
+	SC_R_DMA_3_CH28 = 488,
+	SC_R_DMA_3_CH29 = 489,
+	SC_R_DMA_3_CH30 = 490,
+	SC_R_DMA_3_CH31 = 491,
+	SC_R_AUDIO_PLL_1 = 492,
+	SC_R_AUDIO_CLK_0 = 493,
+	SC_R_AUDIO_CLK_1 = 494,
+	SC_R_MCLK_OUT_0 = 495,
+	SC_R_MCLK_OUT_1 = 496,
+	SC_R_PMIC_0 = 497,
+	SC_R_PMIC_1 = 498,
+	SC_R_SECO = 499,
+	SC_R_CAAM_JR1 = 500,
+	SC_R_CAAM_JR2 = 501,
+	SC_R_CAAM_JR3 = 502,
+	SC_R_SECO_MU_2 = 503,
+	SC_R_SECO_MU_3 = 504,
+	SC_R_SECO_MU_4 = 505,
+	SC_R_HDMI_RX_PWM_0 = 506,
+	SC_R_A35 = 507,
+	SC_R_A35_0 = 508,
+	SC_R_A35_1 = 509,
+	SC_R_A35_2 = 510,
+	SC_R_A35_3 = 511,
+	SC_R_DSP = 512,
+	SC_R_DSP_RAM = 513,
+	SC_R_CAAM_JR1_OUT = 514,
+	SC_R_CAAM_JR2_OUT = 515,
+	SC_R_CAAM_JR3_OUT = 516,
+	SC_R_VPU_DEC_0 = 517,
+	SC_R_VPU_ENC_0 = 518,
+	SC_R_CAAM_JR0 = 519,
+	SC_R_CAAM_JR0_OUT = 520,
+	SC_R_PMIC_2 = 521,
+	SC_R_DBLOGIC = 522,
+	SC_R_HDMI_PLL_1 = 523,
+	SC_R_BOARD_R0 = 524,
+	SC_R_BOARD_R1 = 525,
+	SC_R_BOARD_R2 = 526,
+	SC_R_BOARD_R3 = 527,
+	SC_R_BOARD_R4 = 528,
+	SC_R_BOARD_R5 = 529,
+	SC_R_BOARD_R6 = 530,
+	SC_R_BOARD_R7 = 531,
+	SC_R_MJPEG_DEC_MP = 532,
+	SC_R_MJPEG_ENC_MP = 533,
+	SC_R_VPU_TS_0 = 534,
+	SC_R_VPU_MU_0 = 535,
+	SC_R_VPU_MU_1 = 536,
+	SC_R_VPU_MU_2 = 537,
+	SC_R_VPU_MU_3 = 538,
+	SC_R_VPU_ENC_1 = 539,
+	SC_R_VPU = 540,
+	SC_R_LAST
+} sc_rsrc_t;
+
+/* NOTE - please add by replacing some of the UNUSED from above! */
+
+/*
+ * This type is used to indicate a control.
+ */
+typedef enum sc_ctrl_e {
+	SC_C_TEMP = 0,
+	SC_C_TEMP_HI = 1,
+	SC_C_TEMP_LOW = 2,
+	SC_C_PXL_LINK_MST1_ADDR = 3,
+	SC_C_PXL_LINK_MST2_ADDR = 4,
+	SC_C_PXL_LINK_MST_ENB = 5,
+	SC_C_PXL_LINK_MST1_ENB = 6,
+	SC_C_PXL_LINK_MST2_ENB = 7,
+	SC_C_PXL_LINK_SLV1_ADDR = 8,
+	SC_C_PXL_LINK_SLV2_ADDR = 9,
+	SC_C_PXL_LINK_MST_VLD = 10,
+	SC_C_PXL_LINK_MST1_VLD = 11,
+	SC_C_PXL_LINK_MST2_VLD = 12,
+	SC_C_SINGLE_MODE = 13,
+	SC_C_ID = 14,
+	SC_C_PXL_CLK_POLARITY = 15,
+	SC_C_LINESTATE = 16,
+	SC_C_PCIE_G_RST = 17,
+	SC_C_PCIE_BUTTON_RST = 18,
+	SC_C_PCIE_PERST = 19,
+	SC_C_PHY_RESET = 20,
+	SC_C_PXL_LINK_RATE_CORRECTION = 21,
+	SC_C_PANIC = 22,
+	SC_C_PRIORITY_GROUP = 23,
+	SC_C_TXCLK = 24,
+	SC_C_CLKDIV = 25,
+	SC_C_DISABLE_50 = 26,
+	SC_C_DISABLE_125 = 27,
+	SC_C_SEL_125 = 28,
+	SC_C_MODE = 29,
+	SC_C_SYNC_CTRL0 = 30,
+	SC_C_KACHUNK_CNT = 31,
+	SC_C_KACHUNK_SEL = 32,
+	SC_C_SYNC_CTRL1 = 33,
+	SC_C_DPI_RESET = 34,
+	SC_C_MIPI_RESET = 35,
+	SC_C_DUAL_MODE = 36,
+	SC_C_VOLTAGE = 37,
+	SC_C_PXL_LINK_SEL = 38,
+	SC_C_OFS_SEL = 39,
+	SC_C_OFS_AUDIO = 40,
+	SC_C_OFS_PERIPH = 41,
+	SC_C_OFS_IRQ = 42,
+	SC_C_RST0 = 43,
+	SC_C_RST1 = 44,
+	SC_C_SEL0 = 45,
+	SC_C_LAST
+} sc_ctrl_t;
+
+#endif /* _SC_TYPES_H */
-- 
2.7.4

[PATCH V6 3/3] firmware: imx: add misc svc support

[Dong Aisheng]

Add SCU MISC SVC support which provides misc control get/set functions.

Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v5->v6:
 * move into drivers/firmware/imx
 * using structure sc_ipc as handle instread of sc_ipc_t
 * patch title changed
v4->v5:
 * new patch
---
 drivers/firmware/imx/Makefile  |   2 +-
 drivers/firmware/imx/misc.c    | 106 +++++++++++++++++++++++++++++++++++++++++
 include/soc/imx/scu/sci.h      |   1 +
 include/soc/imx/scu/svc/misc.h |  59 +++++++++++++++++++++++
 4 files changed, 167 insertions(+), 1 deletion(-)
 create mode 100644 drivers/firmware/imx/misc.c
 create mode 100644 include/soc/imx/scu/svc/misc.h

diff --git a/drivers/firmware/imx/Makefile b/drivers/firmware/imx/Makefile
index 9b1e2fe..0ac04df 100644
--- a/drivers/firmware/imx/Makefile
+++ b/drivers/firmware/imx/Makefile
@@ -1,2 +1,2 @@
 # SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_IMX_SCU)	+= imx-scu.o
+obj-$(CONFIG_IMX_SCU)	+= imx-scu.o misc.o
diff --git a/drivers/firmware/imx/misc.c b/drivers/firmware/imx/misc.c
new file mode 100644
index 0000000..af98710
--- /dev/null
+++ b/drivers/firmware/imx/misc.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017~2018 NXP
+ *  Author: Dong Aisheng <aisheng.dong@nxp.com>
+ *
+ * File containing client-side RPC functions for the MISC service. These
+ * function are ported to clients that communicate to the SC.
+ *
+ */
+
+#include <soc/imx/scu/svc/misc.h>
+
+/*
+ * This type is used to indicate RPC MISC function calls.
+ */
+enum misc_func_e {
+	MISC_FUNC_UNKNOWN = 0,
+	MISC_FUNC_SET_CONTROL = 1,
+	MISC_FUNC_GET_CONTROL = 2,
+	MISC_FUNC_SET_MAX_DMA_GROUP = 4,
+	MISC_FUNC_SET_DMA_GROUP = 5,
+	MISC_FUNC_SECO_IMAGE_LOAD = 8,
+	MISC_FUNC_SECO_AUTHENTICATE = 9,
+	MISC_FUNC_DEBUG_OUT = 10,
+	MISC_FUNC_WAVEFORM_CAPTURE = 6,
+	MISC_FUNC_BUILD_INFO = 15,
+	MISC_FUNC_UNIQUE_ID = 19,
+	MISC_FUNC_SET_ARI = 3,
+	MISC_FUNC_BOOT_STATUS = 7,
+	MISC_FUNC_BOOT_DONE = 14,
+	MISC_FUNC_OTP_FUSE_READ = 11,
+	MISC_FUNC_OTP_FUSE_WRITE = 17,
+	MISC_FUNC_SET_TEMP = 12,
+	MISC_FUNC_GET_TEMP = 13,
+	MISC_FUNC_GET_BOOT_DEV = 16,
+	MISC_FUNC_GET_BUTTON_STATUS = 18,
+};
+
+struct imx_sc_msg_req_misc_set_ctrl {
+	struct sc_rpc_msg hdr;
+	u32 ctrl;
+	u32 val;
+	u16 resource;
+} __packed;
+
+struct imx_sc_msg_req_misc_get_ctrl {
+	struct sc_rpc_msg hdr;
+	u32 ctrl;
+	u16 resource;
+} __packed;
+
+struct imx_sc_msg_resp_misc_get_ctrl {
+	struct sc_rpc_msg hdr;
+	u32 val;
+} __packed;
+
+sc_err_t sc_misc_set_control(struct sc_ipc *ipc, sc_rsrc_t resource,
+			     sc_ctrl_t ctrl, uint32_t val)
+{
+	struct imx_sc_msg_req_misc_set_ctrl msg;
+	struct sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = SC_RPC_VERSION;
+	hdr->svc = (uint8_t)SC_RPC_SVC_MISC;
+	hdr->func = (uint8_t)MISC_FUNC_SET_CONTROL;
+	hdr->size = 4;
+
+	msg.ctrl = ctrl;
+	msg.val = val;
+	msg.resource = resource;
+
+	ret = sc_call_rpc(ipc, (void *)&msg, false);
+	if (ret)
+		return SC_ERR_FAIL;
+
+	return (sc_err_t)hdr->func;
+}
+
+sc_err_t sc_misc_get_control(struct sc_ipc *ipc, sc_rsrc_t resource,
+			     sc_ctrl_t ctrl, uint32_t *val)
+{
+	struct imx_sc_msg_req_misc_get_ctrl msg;
+	struct imx_sc_msg_resp_misc_get_ctrl *resp;
+	struct sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = SC_RPC_VERSION;
+	hdr->svc = (uint8_t)SC_RPC_SVC_MISC;
+	hdr->func = (uint8_t)MISC_FUNC_GET_CONTROL;
+	hdr->size = 3;
+
+	msg.ctrl = ctrl;
+	msg.resource = resource;
+
+	ret = sc_call_rpc(ipc, (void *)&msg, false);
+	if (ret)
+		return SC_ERR_FAIL;
+
+	resp = (struct imx_sc_msg_resp_misc_get_ctrl *)&msg;
+	if (val != NULL)
+		*val = resp->val;
+
+	return (sc_err_t)resp->hdr.func;
+}
diff --git a/include/soc/imx/scu/sci.h b/include/soc/imx/scu/sci.h
index e0657d3..4a60d70 100644
--- a/include/soc/imx/scu/sci.h
+++ b/include/soc/imx/scu/sci.h
@@ -13,4 +13,5 @@
 #include <soc/imx/scu/ipc.h>
 #include <soc/imx/scu/types.h>
 
+#include <soc/imx/scu/svc/misc.h>
 #endif /* _SC_SCI_H */
diff --git a/include/soc/imx/scu/svc/misc.h b/include/soc/imx/scu/svc/misc.h
new file mode 100644
index 0000000..1e083fb
--- /dev/null
+++ b/include/soc/imx/scu/svc/misc.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017~2018 NXP
+ *
+ * Header file containing the public API for the System Controller (SC)
+ * Miscellaneous (MISC) function.
+ *
+ * MISC_SVC (SVC) Miscellaneous Service
+ *
+ * Module for the Miscellaneous (MISC) service.
+ */
+
+#ifndef _SC_MISC_API_H
+#define _SC_MISC_API_H
+
+#include <soc/imx/scu/sci.h>
+
+/*
+ * Control Functions
+ */
+
+/*
+ * This function sets a miscellaneous control value.
+ *
+ * @param[in]     ipc         IPC handle
+ * @param[in]     resource    resource the control is associated with
+ * @param[in]     ctrl        control to change
+ * @param[in]     val         value to apply to the control
+ *
+ * @return Returns an error code (SC_ERR_NONE = success).
+ *
+ * Return errors:
+ * - SC_PARM if arguments out of range or invalid,
+ * - SC_ERR_NOACCESS if caller's partition is not the resource owner or parent
+ *   of the owner
+ */
+sc_err_t sc_misc_set_control(struct sc_ipc *ipc, sc_rsrc_t resource,
+			     sc_ctrl_t ctrl, uint32_t val);
+
+/*
+ * This function gets a miscellaneous control value.
+ *
+ * @param[in]     ipc         IPC handle
+ * @param[in]     resource    resource the control is associated with
+ * @param[in]     ctrl        control to get
+ * @param[out]    val         pointer to return the control value
+ *
+ * @return Returns an error code (SC_ERR_NONE = success).
+ *
+ * Return errors:
+ * - SC_PARM if arguments out of range or invalid,
+ * - SC_ERR_NOACCESS if caller's partition is not the resource owner or parent
+ *   of the owner
+ */
+sc_err_t sc_misc_get_control(struct sc_ipc *ipc, sc_rsrc_t resource,
+			     sc_ctrl_t ctrl, uint32_t *val);
+
+#endif /* _SC_MISC_API_H */
-- 
2.7.4

[PATCH V6 2/3] firmware: imx: add SCU firmware driver support

[Sascha Hauer]

Hi Dong,

Looks mostly ok for me now. Some small things inside.

On Wed, Sep 19, 2018 at 11:04:05AM +0800, Dong Aisheng wrote:
> The System Controller Firmware (SCFW) is a low-level system function
> which runs on a dedicated Cortex-M core to provide power, clock, and
> resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
> (QM, QP), and i.MX8QX (QXP, DX).
> 
> This patch implements the SCU firmware IPC function and the common
> message sending API sc_call_rpc.
> 
> +int sc_ipc_get_handle(struct sc_ipc *ipc)
> +{
> +	if (!scu_ipc_handle)
> +		return -EPROBE_DEFER;
> +
> +	ipc = scu_ipc_handle;

You are modifying a local pointer here instead of returning it.

> +	return 0;
> +}
> +EXPORT_SYMBOL(sc_ipc_get_handle);

Could you give the exported functions a better namespace like imx_scu_*?

> +int sc_ipc_write(struct sc_ipc *sc_ipc, void *msg)
> +{

Should be static.

> +
> +		dev_dbg(dev, "request mbox chan %s\n", chan_name);
> +		/* chan_name is not used anymore by framework */
> +		kfree(chan_name);
> +	}
> +
> +	sc_ipc->dev = dev;
> +	mutex_init(&sc_ipc->lock);
> +	init_completion(&sc_ipc->done);
> +
> +	scu_ipc_handle = sc_ipc;
> +
> +	pr_info("NXP i.MX SCU Initialized\n");

dev_info

> +/*
> + * This is an function to send an RPC message over an IPC channel.
> + * It is called by client-side SCFW API function shims.
> + *
> + * @param[in]     ipc         IPC handle
> + * @param[in,out] msg         handle to a message
> + * @param[in]     no_resp     response flag
> + *
> + * If no_resp is false then this function waits for a response
> + * and returns the result in msg.
> + */
> +int sc_call_rpc(struct sc_ipc *ipc, void *msg, bool no_resp);

better name it get_resp or something like that to avoid this double
negation.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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[PATCH V6 3/3] firmware: imx: add misc svc support

[Sascha Hauer]

On Wed, Sep 19, 2018 at 11:04:06AM +0800, Dong Aisheng wrote:
> +enum misc_func_e {
> +	MISC_FUNC_UNKNOWN = 0,
> +	MISC_FUNC_SET_CONTROL = 1,
> +	MISC_FUNC_GET_CONTROL = 2,
> +	MISC_FUNC_SET_MAX_DMA_GROUP = 4,
> +	MISC_FUNC_SET_DMA_GROUP = 5,
> +	MISC_FUNC_SECO_IMAGE_LOAD = 8,
> +	MISC_FUNC_SECO_AUTHENTICATE = 9,
> +	MISC_FUNC_DEBUG_OUT = 10,
> +	MISC_FUNC_WAVEFORM_CAPTURE = 6,
> +	MISC_FUNC_BUILD_INFO = 15,
> +	MISC_FUNC_UNIQUE_ID = 19,
> +	MISC_FUNC_SET_ARI = 3,
> +	MISC_FUNC_BOOT_STATUS = 7,
> +	MISC_FUNC_BOOT_DONE = 14,
> +	MISC_FUNC_OTP_FUSE_READ = 11,
> +	MISC_FUNC_OTP_FUSE_WRITE = 17,
> +	MISC_FUNC_SET_TEMP = 12,
> +	MISC_FUNC_GET_TEMP = 13,
> +	MISC_FUNC_GET_BOOT_DEV = 16,
> +	MISC_FUNC_GET_BUTTON_STATUS = 18,
> +};

Shouldn't that be in some header file? Some types seem to be used by
other drivers, MISC_FUNC_OTP_FUSE_READ for example.

> +sc_err_t sc_misc_set_control(struct sc_ipc *ipc, sc_rsrc_t resource,
> +			     sc_ctrl_t ctrl, uint32_t val)
> +{
> +	struct imx_sc_msg_req_misc_set_ctrl msg;
> +	struct sc_rpc_msg *hdr = &msg.hdr;
> +	int ret;
> +
> +	hdr->ver = SC_RPC_VERSION;
> +	hdr->svc = (uint8_t)SC_RPC_SVC_MISC;
> +	hdr->func = (uint8_t)MISC_FUNC_SET_CONTROL;
> +	hdr->size = 4;
> +
> +	msg.ctrl = ctrl;
> +	msg.val = val;
> +	msg.resource = resource;
> +
> +	ret = sc_call_rpc(ipc, (void *)&msg, false);

No need to cast to void *.

> +/*
> + * This function sets a miscellaneous control value.
> + *
> + * @param[in]     ipc         IPC handle
> + * @param[in]     resource    resource the control is associated with
> + * @param[in]     ctrl        control to change
> + * @param[in]     val         value to apply to the control
> + *
> + * @return Returns an error code (SC_ERR_NONE = success).
> + *
> + * Return errors:
> + * - SC_PARM if arguments out of range or invalid,
> + * - SC_ERR_NOACCESS if caller's partition is not the resource owner or parent
> + *   of the owner
> + */

The function description should be over the function definition, not
above the declaration.

Also I think kerneldoc is preferred here.

Not sure how useful the description of the returned errors is. For once
SC_ERR_FAIL is missing and then the names are quite self explanatory.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[PATCH V6 2/3] firmware: imx: add SCU firmware driver support

[A.s. Dong]

Hi Sasha,

> -----Original Message-----
> From: Sascha Hauer [mailto:s.hauer at pengutronix.de]
> Sent: Thursday, September 20, 2018 3:41 AM
> To: A.s. Dong <aisheng.dong@nxp.com>
> Cc: linux-arm-kernel at lists.infradead.org; dongas86 at gmail.com; Jassi Brar
> <jassisinghbrar@gmail.com>; dl-linux-imx <linux-imx@nxp.com>;
> kernel at pengutronix.de; Fabio Estevam <fabio.estevam@nxp.com>;
> shawnguo at kernel.org
> Subject: Re: [PATCH V6 2/3] firmware: imx: add SCU firmware driver support
> 
> Hi Dong,
> 
> Looks mostly ok for me now. Some small things inside.
> 

Great, thanks for the keeping review.

> On Wed, Sep 19, 2018 at 11:04:05AM +0800, Dong Aisheng wrote:
> > The System Controller Firmware (SCFW) is a low-level system function
> > which runs on a dedicated Cortex-M core to provide power, clock, and
> > resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
> > (QM, QP), and i.MX8QX (QXP, DX).
> >
> > This patch implements the SCU firmware IPC function and the common
> > message sending API sc_call_rpc.
> >
> > +int sc_ipc_get_handle(struct sc_ipc *ipc) {
> > +	if (!scu_ipc_handle)
> > +		return -EPROBE_DEFER;
> > +
> > +	ipc = scu_ipc_handle;
> 
> You are modifying a local pointer here instead of returning it.
> 

My bad mistake.
It should be:
int sc_ipc_get_handle(struct sc_ipc **ipc)
{
        if (!scu_ipc_handle)
                return -EPROBE_DEFER;

        *ipc = scu_ipc_handle;
        return 0;
}

> > +	return 0;
> > +}
> > +EXPORT_SYMBOL(sc_ipc_get_handle);
> 
> Could you give the exported functions a better namespace like imx_scu_*?
> 

Good idea.
Should we change all the rest as well?

> > +int sc_ipc_write(struct sc_ipc *sc_ipc, void *msg) {
> 
> Should be static.
> 

Got it.

> > +
> > +		dev_dbg(dev, "request mbox chan %s\n", chan_name);
> > +		/* chan_name is not used anymore by framework */
> > +		kfree(chan_name);
> > +	}
> > +
> > +	sc_ipc->dev = dev;
> > +	mutex_init(&sc_ipc->lock);
> > +	init_completion(&sc_ipc->done);
> > +
> > +	scu_ipc_handle = sc_ipc;
> > +
> > +	pr_info("NXP i.MX SCU Initialized\n");
> 
> dev_info

Got it

> 
> > +/*
> > + * This is an function to send an RPC message over an IPC channel.
> > + * It is called by client-side SCFW API function shims.
> > + *
> > + * @param[in]     ipc         IPC handle
> > + * @param[in,out] msg         handle to a message
> > + * @param[in]     no_resp     response flag
> > + *
> > + * If no_resp is false then this function waits for a response
> > + * and returns the result in msg.
> > + */
> > +int sc_call_rpc(struct sc_ipc *ipc, void *msg, bool no_resp);
> 
> better name it get_resp or something like that to avoid this double negation.
> 

Good suggestion. Will change.

Regards
Dong Aisheng

> Sascha
> 
> --
> Pengutronix e.K.                           |
> |
> Industrial Linux Solutions                 |
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> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0
> |
> Amtsgericht Hildesheim, HRA 2686           | Fax:
> +49-5121-206917-5555 |

[PATCH V6 3/3] firmware: imx: add misc svc support

[A.s. Dong]

> -----Original Message-----
> From: Sascha Hauer [mailto:s.hauer at pengutronix.de]
> Sent: Thursday, September 20, 2018 4:21 AM
> To: A.s. Dong <aisheng.dong@nxp.com>
> Cc: linux-arm-kernel at lists.infradead.org; dongas86 at gmail.com; dl-linux-imx
> <linux-imx@nxp.com>; kernel at pengutronix.de; Fabio Estevam
> <fabio.estevam@nxp.com>; shawnguo at kernel.org
> Subject: Re: [PATCH V6 3/3] firmware: imx: add misc svc support
> 
> On Wed, Sep 19, 2018 at 11:04:06AM +0800, Dong Aisheng wrote:
> > +enum misc_func_e {
> > +	MISC_FUNC_UNKNOWN = 0,
> > +	MISC_FUNC_SET_CONTROL = 1,
> > +	MISC_FUNC_GET_CONTROL = 2,
> > +	MISC_FUNC_SET_MAX_DMA_GROUP = 4,
> > +	MISC_FUNC_SET_DMA_GROUP = 5,
> > +	MISC_FUNC_SECO_IMAGE_LOAD = 8,
> > +	MISC_FUNC_SECO_AUTHENTICATE = 9,
> > +	MISC_FUNC_DEBUG_OUT = 10,
> > +	MISC_FUNC_WAVEFORM_CAPTURE = 6,
> > +	MISC_FUNC_BUILD_INFO = 15,
> > +	MISC_FUNC_UNIQUE_ID = 19,
> > +	MISC_FUNC_SET_ARI = 3,
> > +	MISC_FUNC_BOOT_STATUS = 7,
> > +	MISC_FUNC_BOOT_DONE = 14,
> > +	MISC_FUNC_OTP_FUSE_READ = 11,
> > +	MISC_FUNC_OTP_FUSE_WRITE = 17,
> > +	MISC_FUNC_SET_TEMP = 12,
> > +	MISC_FUNC_GET_TEMP = 13,
> > +	MISC_FUNC_GET_BOOT_DEV = 16,
> > +	MISC_FUNC_GET_BUTTON_STATUS = 18,
> > +};
> 
> Shouldn't that be in some header file? Some types seem to be used by other
> drivers, MISC_FUNC_OTP_FUSE_READ for example.

Yes, they should be in header file.
Thanks for the careful review. 
The patch was sent a bit earlier to demo the idea and speed up the review.
I will clean up them and send a formal version.

> 
> > +sc_err_t sc_misc_set_control(struct sc_ipc *ipc, sc_rsrc_t resource,
> > +			     sc_ctrl_t ctrl, uint32_t val) {
> > +	struct imx_sc_msg_req_misc_set_ctrl msg;
> > +	struct sc_rpc_msg *hdr = &msg.hdr;
> > +	int ret;
> > +
> > +	hdr->ver = SC_RPC_VERSION;
> > +	hdr->svc = (uint8_t)SC_RPC_SVC_MISC;
> > +	hdr->func = (uint8_t)MISC_FUNC_SET_CONTROL;
> > +	hdr->size = 4;
> > +
> > +	msg.ctrl = ctrl;
> > +	msg.val = val;
> > +	msg.resource = resource;
> > +
> > +	ret = sc_call_rpc(ipc, (void *)&msg, false);
> 
> No need to cast to void *.

Got it.

> 
> > +/*
> > + * This function sets a miscellaneous control value.
> > + *
> > + * @param[in]     ipc         IPC handle
> > + * @param[in]     resource    resource the control is associated with
> > + * @param[in]     ctrl        control to change
> > + * @param[in]     val         value to apply to the control
> > + *
> > + * @return Returns an error code (SC_ERR_NONE = success).
> > + *
> > + * Return errors:
> > + * - SC_PARM if arguments out of range or invalid,
> > + * - SC_ERR_NOACCESS if caller's partition is not the resource owner or
> parent
> > + *   of the owner
> > + */
> 
> The function description should be over the function definition, not above the
> declaration.
> 

Sounds good to me.

> Also I think kerneldoc is preferred here.
> 
> Not sure how useful the description of the returned errors is. For once
> SC_ERR_FAIL is missing and then the names are quite self explanatory.

Yes, you're right.
Just because the return error code is defined by SCU side.
Defining it here may help user if they want to check it.
Not sure if necessary to remove.

Regards
Dong Aisheng

> 
> Sascha
> 
> --
> Pengutronix e.K.                           |
> |
> Industrial Linux Solutions                 |
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> pengutronix.de%2F&amp;data=02%7C01%7Caisheng.dong%40nxp.com%7C59
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> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0
> |
> Amtsgericht Hildesheim, HRA 2686           | Fax:
> +49-5121-206917-5555 |

[PATCH V6 2/3] firmware: imx: add SCU firmware driver support

[Sascha Hauer]

On Thu, Sep 20, 2018 at 02:27:00AM +0000, A.s. Dong wrote:
> Hi Sasha,
> 
> > -----Original Message-----
> > From: Sascha Hauer [mailto:s.hauer at pengutronix.de]
> > Sent: Thursday, September 20, 2018 3:41 AM
> > To: A.s. Dong <aisheng.dong@nxp.com>
> > Cc: linux-arm-kernel at lists.infradead.org; dongas86 at gmail.com; Jassi Brar
> > <jassisinghbrar@gmail.com>; dl-linux-imx <linux-imx@nxp.com>;
> > kernel at pengutronix.de; Fabio Estevam <fabio.estevam@nxp.com>;
> > shawnguo at kernel.org
> > Subject: Re: [PATCH V6 2/3] firmware: imx: add SCU firmware driver support
> > 
> > Hi Dong,
> > 
> > Looks mostly ok for me now. Some small things inside.
> > 
> 
> Great, thanks for the keeping review.
> 
> > On Wed, Sep 19, 2018 at 11:04:05AM +0800, Dong Aisheng wrote:
> > > The System Controller Firmware (SCFW) is a low-level system function
> > > which runs on a dedicated Cortex-M core to provide power, clock, and
> > > resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
> > > (QM, QP), and i.MX8QX (QXP, DX).
> > >
> > > This patch implements the SCU firmware IPC function and the common
> > > message sending API sc_call_rpc.
> > >
> > > +int sc_ipc_get_handle(struct sc_ipc *ipc) {
> > > +	if (!scu_ipc_handle)
> > > +		return -EPROBE_DEFER;
> > > +
> > > +	ipc = scu_ipc_handle;
> > 
> > You are modifying a local pointer here instead of returning it.
> > 
> 
> My bad mistake.
> It should be:
> int sc_ipc_get_handle(struct sc_ipc **ipc)
> {
>         if (!scu_ipc_handle)
>                 return -EPROBE_DEFER;
> 
>         *ipc = scu_ipc_handle;
>         return 0;
> }
> 
> > > +	return 0;
> > > +}
> > > +EXPORT_SYMBOL(sc_ipc_get_handle);
> > 
> > Could you give the exported functions a better namespace like imx_scu_*?
> > 
> 
> Good idea.
> Should we change all the rest as well?

You mean enums and such? Yes, that would be good.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[PATCH V6 2/3] firmware: imx: add SCU firmware driver support

[A.s. Dong]

> -----Original Message-----
> From: Sascha Hauer [mailto:s.hauer at pengutronix.de]
> Sent: Thursday, September 20, 2018 2:34 PM
> To: A.s. Dong <aisheng.dong@nxp.com>
> Cc: linux-arm-kernel at lists.infradead.org; dongas86 at gmail.com; Jassi Brar
> <jassisinghbrar@gmail.com>; dl-linux-imx <linux-imx@nxp.com>;
> kernel at pengutronix.de; Fabio Estevam <fabio.estevam@nxp.com>;
> shawnguo at kernel.org
> Subject: Re: [PATCH V6 2/3] firmware: imx: add SCU firmware driver support
> 
> On Thu, Sep 20, 2018 at 02:27:00AM +0000, A.s. Dong wrote:
> > Hi Sasha,
> >
> > > -----Original Message-----
> > > From: Sascha Hauer [mailto:s.hauer at pengutronix.de]
> > > Sent: Thursday, September 20, 2018 3:41 AM
> > > To: A.s. Dong <aisheng.dong@nxp.com>
> > > Cc: linux-arm-kernel at lists.infradead.org; dongas86 at gmail.com; Jassi
> > > Brar <jassisinghbrar@gmail.com>; dl-linux-imx <linux-imx@nxp.com>;
> > > kernel at pengutronix.de; Fabio Estevam <fabio.estevam@nxp.com>;
> > > shawnguo at kernel.org
> > > Subject: Re: [PATCH V6 2/3] firmware: imx: add SCU firmware driver
> > > support
> > >
> > > Hi Dong,
> > >
> > > Looks mostly ok for me now. Some small things inside.
> > >
> >
> > Great, thanks for the keeping review.
> >
> > > On Wed, Sep 19, 2018 at 11:04:05AM +0800, Dong Aisheng wrote:
> > > > The System Controller Firmware (SCFW) is a low-level system
> > > > function which runs on a dedicated Cortex-M core to provide power,
> > > > clock, and resource management. It exists on some i.MX8
> > > > processors. e.g. i.MX8QM (QM, QP), and i.MX8QX (QXP, DX).
> > > >
> > > > This patch implements the SCU firmware IPC function and the common
> > > > message sending API sc_call_rpc.
> > > >
> > > > +int sc_ipc_get_handle(struct sc_ipc *ipc) {
> > > > +	if (!scu_ipc_handle)
> > > > +		return -EPROBE_DEFER;
> > > > +
> > > > +	ipc = scu_ipc_handle;
> > >
> > > You are modifying a local pointer here instead of returning it.
> > >
> >
> > My bad mistake.
> > It should be:
> > int sc_ipc_get_handle(struct sc_ipc **ipc) {
> >         if (!scu_ipc_handle)
> >                 return -EPROBE_DEFER;
> >
> >         *ipc = scu_ipc_handle;
> >         return 0;
> > }
> >
> > > > +	return 0;
> > > > +}
> > > > +EXPORT_SYMBOL(sc_ipc_get_handle);
> > >
> > > Could you give the exported functions a better namespace like imx_scu_*?
> > >
> >
> > Good idea.
> > Should we change all the rest as well?
> 
> You mean enums and such? Yes, that would be good.

I mean other functions and struct names. All prefixed by imx_scu.
Enums still not changed.
e.g.
diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
index 25e7bfe..46185a8 100644
--- a/drivers/firmware/imx/imx-scu.c
+++ b/drivers/firmware/imx/imx-scu.c
@@ -3,7 +3,7 @@
  * Copyright 2018 NXP
  *  Author: Dong Aisheng <aisheng.dong@nxp.com>
  *
- * Implementation of the IPC functions using MUs (client side).
+ * Implementation of the SCU IPC functions using MUs (client side).
  *
  */
 
@@ -23,17 +23,17 @@
 #define SCU_MU_CHAN_NUM                8
 #define MAX_RX_TIMEOUT         (msecs_to_jiffies(30))
 
-struct sc_chan {
-       struct sc_ipc *sc_ipc;
+struct imx_scu_chan {
+       struct imx_scu_ipc *sc_ipc;
 
        struct mbox_client cl;
        struct mbox_chan *ch;
        int idx;
 };
 
-struct sc_ipc {
+struct imx_scu_ipc {
        /* SCU uses 4 Tx and 4 Rx channels */
-       struct sc_chan chans[SCU_MU_CHAN_NUM];
+       struct imx_scu_chan chans[SCU_MU_CHAN_NUM];
        struct device *dev;
        struct mutex lock;
        struct completion done;
@@ -44,25 +44,25 @@ struct sc_ipc {
        u8 count;
 };
 
-static struct sc_ipc *scu_ipc_handle;
+static struct imx_scu_ipc *imx_scu_ipc_handle;
...

Regards
Dong Aisheng

> 
> Sascha
> 
> --
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[PATCH V6 2/3] firmware: imx: add SCU firmware driver support

[Sascha Hauer]

On Thu, Sep 20, 2018 at 06:41:15AM +0000, A.s. Dong wrote:
> > > > Could you give the exported functions a better namespace like imx_scu_*?
> > > >
> > >
> > > Good idea.
> > > Should we change all the rest as well?
> > 
> > You mean enums and such? Yes, that would be good.
> 
> I mean other functions and struct names. All prefixed by imx_scu.
> Enums still not changed.

I don't really care about stuff that's internal to a single C file, but
everything that is globally visible should have a proper namespace,

Sascha

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Pengutronix e.K.                           |                             |
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[PATCH V6 2/3] firmware: imx: add SCU firmware driver support

[A.s. Dong]

> -----Original Message-----
> From: Sascha Hauer [mailto:s.hauer at pengutronix.de]
> Sent: Thursday, September 20, 2018 2:52 PM
> To: A.s. Dong <aisheng.dong@nxp.com>
> Cc: linux-arm-kernel at lists.infradead.org; dongas86 at gmail.com; Jassi Brar
> <jassisinghbrar@gmail.com>; dl-linux-imx <linux-imx@nxp.com>;
> kernel at pengutronix.de; Fabio Estevam <fabio.estevam@nxp.com>;
> shawnguo at kernel.org
> Subject: Re: [PATCH V6 2/3] firmware: imx: add SCU firmware driver support
> 
> On Thu, Sep 20, 2018 at 06:41:15AM +0000, A.s. Dong wrote:
> > > > > Could you give the exported functions a better namespace like
> imx_scu_*?
> > > > >
> > > >
> > > > Good idea.
> > > > Should we change all the rest as well?
> > >
> > > You mean enums and such? Yes, that would be good.
> >
> > I mean other functions and struct names. All prefixed by imx_scu.
> > Enums still not changed.
> 
> I don't really care about stuff that's internal to a single C file, but everything
> that is globally visible should have a proper namespace,
> 

Okay, I got your point. Thanks

Regards
Dong Aisheng

> Sascha
> 
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