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-rw-r--r--Documentation/devicetree/bindings/arm/cix.yaml26
-rw-r--r--Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml77
-rw-r--r--Documentation/devicetree/bindings/vendor-prefixes.yaml2
-rw-r--r--MAINTAINERS13
-rw-r--r--arch/arm64/Kconfig.platforms6
-rw-r--r--arch/arm64/boot/dts/Makefile1
-rw-r--r--arch/arm64/boot/dts/cix/Makefile2
-rw-r--r--arch/arm64/boot/dts/cix/sky1-orion-o6.dts39
-rw-r--r--arch/arm64/boot/dts/cix/sky1.dtsi330
-rw-r--r--arch/arm64/configs/defconfig2
-rw-r--r--drivers/mailbox/Kconfig10
-rw-r--r--drivers/mailbox/Makefile2
-rw-r--r--drivers/mailbox/cix-mailbox.c645
-rw-r--r--include/dt-bindings/clock/cix,sky1.h279
14 files changed, 1434 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/cix.yaml b/Documentation/devicetree/bindings/arm/cix.yaml
new file mode 100644
index 000000000000..114dab4bc4d2
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/cix.yaml
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/cix.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: CIX platforms
+
+maintainers:
+ - Peter Chen <peter.chen@cixtech.com>
+ - Fugang Duan <fugang.duan@cixtech.com>
+
+properties:
+ $nodename:
+ const: '/'
+ compatible:
+ oneOf:
+
+ - description: Radxa Orion O6
+ items:
+ - const: radxa,orion-o6
+ - const: cix,sky1
+
+additionalProperties: true
+
+...
diff --git a/Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml b/Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
new file mode 100644
index 000000000000..66d75b7bc8c8
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/cix,sky1-mbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cixtech mailbox controller
+
+maintainers:
+ - Guomin Chen <Guomin.Chen@cixtech.com>
+
+description:
+ The Cixtech mailbox controller, used in the Cixtech Sky1 SoC,
+ is used for message transmission between multiple processors
+ within the SoC, such as the AP, PM, audio DSP, SensorHub MCU,
+ and others
+
+ Each Cixtech mailbox controller is unidirectional, so they are
+ typically used in pairs-one for receiving and one for transmitting.
+
+ Each Cixtech mailbox supports 11 channels with different transmission modes
+ channel 0-7 - Fast channel with 32bit transmit register and IRQ support
+ channel 8 - Doorbell mode,using the mailbox as an interrupt-generating
+ mechanism.
+ channel 9 - Fifo based channel with 32*32bit depth fifo and IRQ support
+ channel 10 - Reg based channel with 32*32bit transmit register and
+ Doorbell+transmit acknowledgment IRQ support
+
+ In the CIX Sky1 SoC use case, there are 4 pairs of mailbox controllers
+ AP <--> PM - using Doorbell transfer mode
+ AP <--> SE - using REG transfer mode
+ AP <--> DSP - using FIFO transfer mode
+ AP <--> SensorHub - using FIFO transfer mode
+
+properties:
+ compatible:
+ const: cix,sky1-mbox
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ "#mbox-cells":
+ const: 1
+
+ cix,mbox-dir:
+ $ref: /schemas/types.yaml#/definitions/string
+ description: Direction of the mailbox relative to the AP
+ enum: [tx, rx]
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - "#mbox-cells"
+ - cix,mbox-dir
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ mbox_ap2pm: mailbox@30000000 {
+ compatible = "cix,sky1-mbox";
+ reg = <0 0x30000000 0 0x10000>;
+ interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH 0>;
+ #mbox-cells = <1>;
+ cix,mbox-dir = "tx";
+ };
+ };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 5d2a7a8d3ac6..f258c1f53b3c 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -306,6 +306,8 @@ patternProperties:
description: Cirrus Logic, Inc.
"^cisco,.*":
description: Cisco Systems, Inc.
+ "^cix,.*":
+ description: CIX Technology Group Co., Ltd.
"^clockwork,.*":
description: Clockwork Tech LLC
"^cloos,.*":
diff --git a/MAINTAINERS b/MAINTAINERS
index 7039b4680a68..def47dfb6e0a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2472,6 +2472,19 @@ F: arch/arm/boot/compressed/misc-ep93xx.h
F: arch/arm/mach-ep93xx/
F: drivers/iio/adc/ep93xx_adc.c
+ARM/CIX SOC SUPPORT
+M: Peter Chen <peter.chen@cixtech.com>
+M: Fugang Duan <fugang.duan@cixtech.com>
+R: CIX Linux Kernel Upstream Group <cix-kernel-upstream@cixtech.com>
+L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S: Maintained
+T: git git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/cix.git
+F: Documentation/devicetree/bindings/arm/cix.yaml
+F: Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
+F: arch/arm64/boot/dts/cix/
+F: drivers/mailbox/cix-mailbox.c
+K: \bcix\b
+
ARM/CLKDEV SUPPORT
M: Russell King <linux@armlinux.org.uk>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index 74a8e1c113df..4dfbc65bb81f 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -106,6 +106,12 @@ config ARCH_BLAIZE
help
This enables support for the Blaize SoC family
+config ARCH_CIX
+ bool "Cixtech SoC family"
+ help
+ This enables support for the Cixtech SoC family,
+ like P1(sky1).
+
config ARCH_EXYNOS
bool "Samsung Exynos SoC family"
select COMMON_CLK_SAMSUNG
diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
index 79b73a21ddc2..8e7ccd0027bd 100644
--- a/arch/arm64/boot/dts/Makefile
+++ b/arch/arm64/boot/dts/Makefile
@@ -13,6 +13,7 @@ subdir-y += bitmain
subdir-y += blaize
subdir-y += broadcom
subdir-y += cavium
+subdir-y += cix
subdir-y += exynos
subdir-y += freescale
subdir-y += hisilicon
diff --git a/arch/arm64/boot/dts/cix/Makefile b/arch/arm64/boot/dts/cix/Makefile
new file mode 100644
index 000000000000..ed3713982012
--- /dev/null
+++ b/arch/arm64/boot/dts/cix/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+dtb-$(CONFIG_ARCH_CIX) += sky1-orion-o6.dtb
diff --git a/arch/arm64/boot/dts/cix/sky1-orion-o6.dts b/arch/arm64/boot/dts/cix/sky1-orion-o6.dts
new file mode 100644
index 000000000000..d74964d53c3b
--- /dev/null
+++ b/arch/arm64/boot/dts/cix/sky1-orion-o6.dts
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright 2025 Cix Technology Group Co., Ltd.
+ *
+ */
+
+/dts-v1/;
+
+#include "sky1.dtsi"
+/ {
+ model = "Radxa Orion O6";
+ compatible = "radxa,orion-o6", "cix,sky1";
+
+ aliases {
+ serial2 = &uart2;
+ };
+
+ chosen {
+ stdout-path = &uart2;
+ };
+
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ linux,cma {
+ compatible = "shared-dma-pool";
+ reusable;
+ size = <0x0 0x28000000>;
+ linux,cma-default;
+ };
+ };
+
+};
+
+&uart2 {
+ status = "okay";
+};
diff --git a/arch/arm64/boot/dts/cix/sky1.dtsi b/arch/arm64/boot/dts/cix/sky1.dtsi
new file mode 100644
index 000000000000..7dfe7677e649
--- /dev/null
+++ b/arch/arm64/boot/dts/cix/sky1.dtsi
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright 2025 Cix Technology Group Co., Ltd.
+ *
+ */
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/clock/cix,sky1.h>
+
+/ {
+ interrupt-parent = <&gic>;
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ cpus {
+ #address-cells = <2>;
+ #size-cells = <0>;
+
+ cpu0: cpu@0 {
+ compatible = "arm,cortex-a520";
+ enable-method = "psci";
+ reg = <0x0 0x0>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <403>;
+ };
+
+ cpu1: cpu@100 {
+ compatible = "arm,cortex-a520";
+ enable-method = "psci";
+ reg = <0x0 0x100>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <403>;
+ };
+
+ cpu2: cpu@200 {
+ compatible = "arm,cortex-a520";
+ enable-method = "psci";
+ reg = <0x0 0x200>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <403>;
+ };
+
+ cpu3: cpu@300 {
+ compatible = "arm,cortex-a520";
+ enable-method = "psci";
+ reg = <0x0 0x300>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <403>;
+ };
+
+ cpu4: cpu@400 {
+ compatible = "arm,cortex-a720";
+ enable-method = "psci";
+ reg = <0x0 0x400>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu5: cpu@500 {
+ compatible = "arm,cortex-a720";
+ enable-method = "psci";
+ reg = <0x0 0x500>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu6: cpu@600 {
+ compatible = "arm,cortex-a720";
+ enable-method = "psci";
+ reg = <0x0 0x600>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu7: cpu@700 {
+ compatible = "arm,cortex-a720";
+ enable-method = "psci";
+ reg = <0x0 0x700>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu8: cpu@800 {
+ compatible = "arm,cortex-a720";
+ enable-method = "psci";
+ reg = <0x0 0x800>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu9: cpu@900 {
+ compatible = "arm,cortex-a720";
+ enable-method = "psci";
+ reg = <0x0 0x900>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu10: cpu@a00 {
+ compatible = "arm,cortex-a720";
+ enable-method = "psci";
+ reg = <0x0 0xa00>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu11: cpu@b00 {
+ compatible = "arm,cortex-a720";
+ enable-method = "psci";
+ reg = <0x0 0xb00>;
+ device_type = "cpu";
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu-map {
+ cluster0 {
+ core0 {
+ cpu = <&cpu0>;
+ };
+ core1 {
+ cpu = <&cpu1>;
+ };
+ core2 {
+ cpu = <&cpu2>;
+ };
+ core3 {
+ cpu = <&cpu3>;
+ };
+ core4 {
+ cpu = <&cpu4>;
+ };
+ core5 {
+ cpu = <&cpu5>;
+ };
+ core6 {
+ cpu = <&cpu6>;
+ };
+ core7 {
+ cpu = <&cpu7>;
+ };
+ core8 {
+ cpu = <&cpu8>;
+ };
+ core9 {
+ cpu = <&cpu9>;
+ };
+ core10 {
+ cpu = <&cpu10>;
+ };
+ core11 {
+ cpu = <&cpu11>;
+ };
+ };
+ };
+ };
+
+ firmware {
+ ap_to_pm_scmi: scmi {
+ compatible = "arm,scmi";
+ mbox-names = "tx", "rx";
+ mboxes = <&mbox_ap2pm 8>, <&mbox_pm2ap 8>;
+ shmem = <&ap2pm_scmi_mem>, <&pm2ap_scmi_mem>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ scmi_clk: protocol@14 {
+ reg = <0x14>;
+ #clock-cells = <1>;
+ };
+ };
+ };
+
+ pmu-a520 {
+ compatible = "arm,cortex-a520-pmu";
+ interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW &ppi_partition0>;
+ };
+
+ pmu-a720 {
+ compatible = "arm,cortex-a720-pmu";
+ interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW &ppi_partition1>;
+ };
+
+ psci {
+ compatible = "arm,psci-1.0";
+ method = "smc";
+ };
+
+ soc@0 {
+ compatible = "simple-bus";
+ ranges = <0 0 0 0 0x20 0>;
+ dma-ranges;
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ uart0: serial@40b0000 {
+ compatible = "arm,pl011", "arm,primecell";
+ reg = <0x0 0x040b0000 0x0 0x1000>;
+ interrupts = <GIC_SPI 296 IRQ_TYPE_LEVEL_HIGH 0>;
+ clocks = <&scmi_clk CLK_TREE_FCH_UART0_FUNC>, <&scmi_clk CLK_TREE_FCH_UART0_APB>;
+ clock-names = "uartclk", "apb_pclk";
+ status = "disabled";
+ };
+
+ uart1: serial@40c0000 {
+ compatible = "arm,pl011", "arm,primecell";
+ reg = <0x0 0x040c0000 0x0 0x1000>;
+ interrupts = <GIC_SPI 297 IRQ_TYPE_LEVEL_HIGH 0>;
+ clocks = <&scmi_clk CLK_TREE_FCH_UART1_FUNC>, <&scmi_clk CLK_TREE_FCH_UART1_APB>;
+ clock-names = "uartclk", "apb_pclk";
+ status = "disabled";
+ };
+
+ uart2: serial@40d0000 {
+ compatible = "arm,pl011", "arm,primecell";
+ reg = <0x0 0x040d0000 0x0 0x1000>;
+ interrupts = <GIC_SPI 298 IRQ_TYPE_LEVEL_HIGH 0>;
+ clocks = <&scmi_clk CLK_TREE_FCH_UART2_FUNC>, <&scmi_clk CLK_TREE_FCH_UART2_APB>;
+ clock-names = "uartclk", "apb_pclk";
+ status = "disabled";
+ };
+
+ uart3: serial@40e0000 {
+ compatible = "arm,pl011", "arm,primecell";
+ reg = <0x0 0x040e0000 0x0 0x1000>;
+ interrupts = <GIC_SPI 299 IRQ_TYPE_LEVEL_HIGH 0>;
+ clocks = <&scmi_clk CLK_TREE_FCH_UART3_FUNC>, <&scmi_clk CLK_TREE_FCH_UART3_APB>;
+ clock-names = "uartclk", "apb_pclk";
+ status = "disabled";
+ };
+
+ mbox_ap2se: mailbox@5060000 {
+ compatible = "cix,sky1-mbox";
+ reg = <0x0 0x05060000 0x0 0x10000>;
+ interrupts = <GIC_SPI 378 IRQ_TYPE_LEVEL_HIGH 0>;
+ #mbox-cells = <1>;
+ cix,mbox-dir = "tx";
+ };
+
+ mbox_se2ap: mailbox@5070000 {
+ compatible = "cix,sky1-mbox";
+ reg = <0x0 0x05070000 0x0 0x10000>;
+ interrupts = <GIC_SPI 379 IRQ_TYPE_LEVEL_HIGH 0>;
+ #mbox-cells = <1>;
+ cix,mbox-dir = "rx";
+ };
+
+ ap2pm_scmi_mem: shmem@6590000 {
+ compatible = "arm,scmi-shmem";
+ reg = <0x0 0x06590000 0x0 0x80>;
+ reg-io-width = <4>;
+ };
+
+ mbox_ap2pm: mailbox@6590080 {
+ compatible = "cix,sky1-mbox";
+ reg = <0x0 0x06590080 0x0 0xff80>;
+ interrupts = <GIC_SPI 363 IRQ_TYPE_LEVEL_HIGH 0>;
+ #mbox-cells = <1>;
+ cix,mbox-dir = "tx";
+ };
+
+ pm2ap_scmi_mem: shmem@65a0000 {
+ compatible = "arm,scmi-shmem";
+ reg = <0x0 0x065a0000 0x0 0x80>;
+ reg-io-width = <4>;
+ };
+
+ mbox_pm2ap: mailbox@65a0080 {
+ compatible = "cix,sky1-mbox";
+ reg = <0x0 0x065a0080 0x0 0xff80>;
+ interrupts = <GIC_SPI 359 IRQ_TYPE_LEVEL_HIGH 0>;
+ #mbox-cells = <1>;
+ cix,mbox-dir = "rx";
+ };
+
+ mbox_sfh2ap: mailbox@8090000 {
+ compatible = "cix,sky1-mbox";
+ reg = <0x0 0x08090000 0x0 0x10000>;
+ interrupts = <GIC_SPI 391 IRQ_TYPE_LEVEL_HIGH 0>;
+ #mbox-cells = <1>;
+ cix,mbox-dir = "rx";
+ };
+
+ mbox_ap2sfh: mailbox@80a0000 {
+ compatible = "cix,sky1-mbox";
+ reg = <0x0 0x080a0000 0x0 0x10000>;
+ interrupts = <GIC_SPI 392 IRQ_TYPE_LEVEL_HIGH 0>;
+ #mbox-cells = <1>;
+ cix,mbox-dir = "tx";
+ };
+
+ gic: interrupt-controller@e010000 {
+ compatible = "arm,gic-v3";
+ reg = <0x0 0x0e010000 0 0x10000>, /* GICD */
+ <0x0 0x0e090000 0 0x300000>; /* GICR * 12 */
+ interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_LOW 0>;
+ #interrupt-cells = <4>;
+ interrupt-controller;
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ gic_its: msi-controller@e050000 {
+ compatible = "arm,gic-v3-its";
+ reg = <0x0 0x0e050000 0x0 0x30000>;
+ msi-controller;
+ #msi-cells = <1>;
+ };
+
+ ppi-partitions {
+ ppi_partition0: interrupt-partition-0 {
+ affinity = <&cpu0 &cpu1 &cpu2 &cpu3>;
+ };
+
+ ppi_partition1: interrupt-partition-1 {
+ affinity = <&cpu4 &cpu5 &cpu6 &cpu7 &cpu8 &cpu9 &cpu10 &cpu11>;
+ };
+ };
+ };
+ };
+
+ timer {
+ compatible = "arm,armv8-timer";
+ interrupt-names = "sec-phys", "phys", "virt", "hyp-phys", "hyp-virt";
+ interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW 0>,
+ <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW 0>,
+ <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW 0>,
+ <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW 0>,
+ <GIC_PPI 12 IRQ_TYPE_LEVEL_LOW 0>;
+ };
+};
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 897fc686e6a9..181c5f91b032 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -45,6 +45,7 @@ CONFIG_ARCH_BCMBCA=y
CONFIG_ARCH_BRCMSTB=y
CONFIG_ARCH_BERLIN=y
CONFIG_ARCH_BLAIZE=y
+CONFIG_ARCH_CIX=y
CONFIG_ARCH_EXYNOS=y
CONFIG_ARCH_SPARX5=y
CONFIG_ARCH_K3=y
@@ -1445,6 +1446,7 @@ CONFIG_BCM2835_MBOX=y
CONFIG_QCOM_APCS_IPC=y
CONFIG_MTK_ADSP_MBOX=m
CONFIG_QCOM_IPCC=y
+CONFIG_CIX_MBOX=y
CONFIG_ROCKCHIP_IOMMU=y
CONFIG_TEGRA_IOMMU_SMMU=y
CONFIG_ARM_SMMU=y
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 68eeed660a4a..4fef4797b110 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -340,4 +340,14 @@ config THEAD_TH1520_MBOX
kernel is running, and E902 core used for power management among other
things.
+config CIX_MBOX
+ tristate "CIX Mailbox"
+ depends on ARCH_CIX || COMPILE_TEST
+ depends on OF
+ help
+ Mailbox implementation for CIX IPC system. The controller supports
+ 11 mailbox channels with different operating mode and every channel
+ is unidirectional. Say Y here if you want to use the CIX Mailbox
+ support.
+
endif
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index 13a3448b3271..786a46587ba1 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -72,3 +72,5 @@ obj-$(CONFIG_QCOM_CPUCP_MBOX) += qcom-cpucp-mbox.o
obj-$(CONFIG_QCOM_IPCC) += qcom-ipcc.o
obj-$(CONFIG_THEAD_TH1520_MBOX) += mailbox-th1520.o
+
+obj-$(CONFIG_CIX_MBOX) += cix-mailbox.o
diff --git a/drivers/mailbox/cix-mailbox.c b/drivers/mailbox/cix-mailbox.c
new file mode 100644
index 000000000000..5bb1416c26a5
--- /dev/null
+++ b/drivers/mailbox/cix-mailbox.c
@@ -0,0 +1,645 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025 Cix Technology Group Co., Ltd.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mailbox_controller.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "mailbox.h"
+
+/*
+ * The maximum transmission size is 32 words or 128 bytes.
+ */
+#define CIX_MBOX_MSG_WORDS 32 /* Max length = 32 words */
+#define CIX_MBOX_MSG_LEN_MASK 0x7fL /* Max length = 128 bytes */
+
+/* [0~7] Fast channel
+ * [8] doorbell base channel
+ * [9]fifo base channel
+ * [10] register base channel
+ */
+#define CIX_MBOX_FAST_IDX 7
+#define CIX_MBOX_DB_IDX 8
+#define CIX_MBOX_FIFO_IDX 9
+#define CIX_MBOX_REG_IDX 10
+#define CIX_MBOX_CHANS 11
+
+/* Register define */
+#define CIX_REG_MSG(n) (0x0 + 0x4*(n)) /* 0x0~0x7c */
+#define CIX_REG_DB_ACK CIX_REG_MSG(CIX_MBOX_MSG_WORDS) /* 0x80 */
+#define CIX_ERR_COMP (CIX_REG_DB_ACK + 0x4) /* 0x84 */
+#define CIX_ERR_COMP_CLR (CIX_REG_DB_ACK + 0x8) /* 0x88 */
+#define CIX_REG_F_INT(IDX) (CIX_ERR_COMP_CLR + 0x4*(IDX+1)) /* 0x8c~0xa8 */
+#define CIX_FIFO_WR (CIX_REG_F_INT(CIX_MBOX_FAST_IDX+1)) /* 0xac */
+#define CIX_FIFO_RD (CIX_FIFO_WR + 0x4) /* 0xb0 */
+#define CIX_FIFO_STAS (CIX_FIFO_WR + 0x8) /* 0xb4 */
+#define CIX_FIFO_WM (CIX_FIFO_WR + 0xc) /* 0xb8 */
+#define CIX_INT_ENABLE (CIX_FIFO_WR + 0x10) /* 0xbc */
+#define CIX_INT_ENABLE_SIDE_B (CIX_FIFO_WR + 0x14) /* 0xc0 */
+#define CIX_INT_CLEAR (CIX_FIFO_WR + 0x18) /* 0xc4 */
+#define CIX_INT_STATUS (CIX_FIFO_WR + 0x1c) /* 0xc8 */
+#define CIX_FIFO_RST (CIX_FIFO_WR + 0x20) /* 0xcc */
+
+#define CIX_MBOX_TX 0
+#define CIX_MBOX_RX 1
+
+#define CIX_DB_INT_BIT BIT(0)
+#define CIX_DB_ACK_INT_BIT BIT(1)
+
+#define CIX_FIFO_WM_DEFAULT CIX_MBOX_MSG_WORDS
+#define CIX_FIFO_STAS_WMK BIT(0)
+#define CIX_FIFO_STAS_FULL BIT(1)
+#define CIX_FIFO_STAS_EMPTY BIT(2)
+#define CIX_FIFO_STAS_UFLOW BIT(3)
+#define CIX_FIFO_STAS_OFLOW BIT(4)
+
+#define CIX_FIFO_RST_BIT BIT(0)
+
+#define CIX_DB_INT BIT(0)
+#define CIX_ACK_INT BIT(1)
+#define CIX_FIFO_FULL_INT BIT(2)
+#define CIX_FIFO_EMPTY_INT BIT(3)
+#define CIX_FIFO_WM01_INT BIT(4)
+#define CIX_FIFO_WM10_INT BIT(5)
+#define CIX_FIFO_OFLOW_INT BIT(6)
+#define CIX_FIFO_UFLOW_INT BIT(7)
+#define CIX_FIFO_N_EMPTY_INT BIT(8)
+#define CIX_FAST_CH_INT(IDX) BIT((IDX)+9)
+
+#define CIX_SHMEM_OFFSET 0x80
+
+enum cix_mbox_chan_type {
+ CIX_MBOX_TYPE_DB,
+ CIX_MBOX_TYPE_REG,
+ CIX_MBOX_TYPE_FIFO,
+ CIX_MBOX_TYPE_FAST,
+};
+
+struct cix_mbox_con_priv {
+ enum cix_mbox_chan_type type;
+ struct mbox_chan *chan;
+ int index;
+};
+
+struct cix_mbox_priv {
+ struct device *dev;
+ int irq;
+ int dir;
+ void __iomem *base; /* region for mailbox */
+ struct cix_mbox_con_priv con_priv[CIX_MBOX_CHANS];
+ struct mbox_chan mbox_chans[CIX_MBOX_CHANS];
+ struct mbox_controller mbox;
+ bool use_shmem;
+};
+
+/*
+ * The CIX mailbox supports four types of transfers:
+ * CIX_MBOX_TYPE_DB, CIX_MBOX_TYPE_FAST, CIX_MBOX_TYPE_REG, and CIX_MBOX_TYPE_FIFO.
+ * For the REG and FIFO types of transfers, the message format is as follows:
+ */
+union cix_mbox_msg_reg_fifo {
+ u32 length; /* unit is byte */
+ u32 buf[CIX_MBOX_MSG_WORDS]; /* buf[0] must be the byte length of this array */
+};
+
+static struct cix_mbox_priv *to_cix_mbox_priv(struct mbox_controller *mbox)
+{
+ return container_of(mbox, struct cix_mbox_priv, mbox);
+}
+
+static void cix_mbox_write(struct cix_mbox_priv *priv, u32 val, u32 offset)
+{
+ if (priv->use_shmem)
+ iowrite32(val, priv->base + offset - CIX_SHMEM_OFFSET);
+ else
+ iowrite32(val, priv->base + offset);
+}
+
+static u32 cix_mbox_read(struct cix_mbox_priv *priv, u32 offset)
+{
+ if (priv->use_shmem)
+ return ioread32(priv->base + offset - CIX_SHMEM_OFFSET);
+ else
+ return ioread32(priv->base + offset);
+}
+
+static bool mbox_fifo_empty(struct mbox_chan *chan)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+
+ return ((cix_mbox_read(priv, CIX_FIFO_STAS) & CIX_FIFO_STAS_EMPTY) ? true : false);
+}
+
+/*
+ *The transmission unit of the CIX mailbox is word.
+ *The byte length should be converted into the word length.
+ */
+static inline u32 mbox_get_msg_size(void *msg)
+{
+ u32 len;
+
+ len = ((u32 *)msg)[0] & CIX_MBOX_MSG_LEN_MASK;
+ return DIV_ROUND_UP(len, 4);
+}
+
+static int cix_mbox_send_data_db(struct mbox_chan *chan, void *data)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+
+ /* trigger doorbell irq */
+ cix_mbox_write(priv, CIX_DB_INT_BIT, CIX_REG_DB_ACK);
+
+ return 0;
+}
+
+static int cix_mbox_send_data_reg(struct mbox_chan *chan, void *data)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ union cix_mbox_msg_reg_fifo *msg = data;
+ u32 len, i;
+
+ if (!data)
+ return -EINVAL;
+
+ len = mbox_get_msg_size(data);
+ for (i = 0; i < len; i++)
+ cix_mbox_write(priv, msg->buf[i], CIX_REG_MSG(i));
+
+ /* trigger doorbell irq */
+ cix_mbox_write(priv, CIX_DB_INT_BIT, CIX_REG_DB_ACK);
+
+ return 0;
+}
+
+static int cix_mbox_send_data_fifo(struct mbox_chan *chan, void *data)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ union cix_mbox_msg_reg_fifo *msg = data;
+ u32 len, val, i;
+
+ if (!data)
+ return -EINVAL;
+
+ len = mbox_get_msg_size(data);
+ cix_mbox_write(priv, len, CIX_FIFO_WM);
+ for (i = 0; i < len; i++)
+ cix_mbox_write(priv, msg->buf[i], CIX_FIFO_WR);
+
+ /* Enable fifo empty interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE);
+ val |= CIX_FIFO_EMPTY_INT;
+ cix_mbox_write(priv, val, CIX_INT_ENABLE);
+
+ return 0;
+}
+
+static int cix_mbox_send_data_fast(struct mbox_chan *chan, void *data)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ struct cix_mbox_con_priv *cp = chan->con_priv;
+ u32 *arg = (u32 *)data;
+ int index = cp->index;
+
+ if (!data)
+ return -EINVAL;
+
+ if (index < 0 || index > CIX_MBOX_FAST_IDX) {
+ dev_err(priv->dev, "Invalid Mbox index %d\n", index);
+ return -EINVAL;
+ }
+
+ cix_mbox_write(priv, arg[0], CIX_REG_F_INT(index));
+
+ return 0;
+}
+
+static int cix_mbox_send_data(struct mbox_chan *chan, void *data)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ struct cix_mbox_con_priv *cp = chan->con_priv;
+
+ if (priv->dir != CIX_MBOX_TX) {
+ dev_err(priv->dev, "Invalid Mbox dir %d\n", priv->dir);
+ return -EINVAL;
+ }
+
+ switch (cp->type) {
+ case CIX_MBOX_TYPE_DB:
+ cix_mbox_send_data_db(chan, data);
+ break;
+ case CIX_MBOX_TYPE_REG:
+ cix_mbox_send_data_reg(chan, data);
+ break;
+ case CIX_MBOX_TYPE_FIFO:
+ cix_mbox_send_data_fifo(chan, data);
+ break;
+ case CIX_MBOX_TYPE_FAST:
+ cix_mbox_send_data_fast(chan, data);
+ break;
+ default:
+ dev_err(priv->dev, "Invalid channel type: %d\n", cp->type);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void cix_mbox_isr_db(struct mbox_chan *chan)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ u32 int_status;
+
+ int_status = cix_mbox_read(priv, CIX_INT_STATUS);
+
+ if (priv->dir == CIX_MBOX_RX) {
+ /* rx interrupt is triggered */
+ if (int_status & CIX_DB_INT) {
+ cix_mbox_write(priv, CIX_DB_INT, CIX_INT_CLEAR);
+ mbox_chan_received_data(chan, NULL);
+ /* trigger ack interrupt */
+ cix_mbox_write(priv, CIX_DB_ACK_INT_BIT, CIX_REG_DB_ACK);
+ }
+ } else {
+ /* tx ack interrupt is triggered */
+ if (int_status & CIX_ACK_INT) {
+ cix_mbox_write(priv, CIX_ACK_INT, CIX_INT_CLEAR);
+ mbox_chan_received_data(chan, NULL);
+ }
+ }
+}
+
+static void cix_mbox_isr_reg(struct mbox_chan *chan)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ u32 int_status;
+
+ int_status = cix_mbox_read(priv, CIX_INT_STATUS);
+
+ if (priv->dir == CIX_MBOX_RX) {
+ /* rx interrupt is triggered */
+ if (int_status & CIX_DB_INT) {
+ u32 data[CIX_MBOX_MSG_WORDS], len, i;
+
+ cix_mbox_write(priv, CIX_DB_INT, CIX_INT_CLEAR);
+ data[0] = cix_mbox_read(priv, CIX_REG_MSG(0));
+ len = mbox_get_msg_size(data);
+ for (i = 1; i < len; i++)
+ data[i] = cix_mbox_read(priv, CIX_REG_MSG(i));
+
+ /* trigger ack interrupt */
+ cix_mbox_write(priv, CIX_DB_ACK_INT_BIT, CIX_REG_DB_ACK);
+ mbox_chan_received_data(chan, data);
+ }
+ } else {
+ /* tx ack interrupt is triggered */
+ if (int_status & CIX_ACK_INT) {
+ cix_mbox_write(priv, CIX_ACK_INT, CIX_INT_CLEAR);
+ mbox_chan_txdone(chan, 0);
+ }
+ }
+}
+
+static void cix_mbox_isr_fifo(struct mbox_chan *chan)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ u32 int_status, status;
+
+ int_status = cix_mbox_read(priv, CIX_INT_STATUS);
+
+ if (priv->dir == CIX_MBOX_RX) {
+ /* FIFO waterMark interrupt is generated */
+ if (int_status & (CIX_FIFO_FULL_INT | CIX_FIFO_WM01_INT)) {
+ u32 data[CIX_MBOX_MSG_WORDS] = { 0 }, i = 0;
+
+ cix_mbox_write(priv, (CIX_FIFO_FULL_INT | CIX_FIFO_WM01_INT),
+ CIX_INT_CLEAR);
+ do {
+ data[i++] = cix_mbox_read(priv, CIX_FIFO_RD);
+ } while (!mbox_fifo_empty(chan) && i < CIX_MBOX_MSG_WORDS);
+
+ mbox_chan_received_data(chan, data);
+ }
+ /* FIFO underflow is generated */
+ if (int_status & CIX_FIFO_UFLOW_INT) {
+ status = cix_mbox_read(priv, CIX_FIFO_STAS);
+ dev_err(priv->dev, "fifo underflow: int_stats %d\n", status);
+ cix_mbox_write(priv, CIX_FIFO_UFLOW_INT, CIX_INT_CLEAR);
+ }
+ } else {
+ /* FIFO empty interrupt is generated */
+ if (int_status & CIX_FIFO_EMPTY_INT) {
+ u32 val;
+
+ cix_mbox_write(priv, CIX_FIFO_EMPTY_INT, CIX_INT_CLEAR);
+ /* Disable empty irq*/
+ val = cix_mbox_read(priv, CIX_INT_ENABLE);
+ val &= ~CIX_FIFO_EMPTY_INT;
+ cix_mbox_write(priv, val, CIX_INT_ENABLE);
+ mbox_chan_txdone(chan, 0);
+ }
+ /* FIFO overflow is generated */
+ if (int_status & CIX_FIFO_OFLOW_INT) {
+ status = cix_mbox_read(priv, CIX_FIFO_STAS);
+ dev_err(priv->dev, "fifo overlow: int_stats %d\n", status);
+ cix_mbox_write(priv, CIX_FIFO_OFLOW_INT, CIX_INT_CLEAR);
+ }
+ }
+}
+
+static void cix_mbox_isr_fast(struct mbox_chan *chan)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ struct cix_mbox_con_priv *cp = chan->con_priv;
+ u32 int_status, data;
+
+ /* no irq will be trigger for TX dir mbox */
+ if (priv->dir != CIX_MBOX_RX)
+ return;
+
+ int_status = cix_mbox_read(priv, CIX_INT_STATUS);
+
+ if (int_status & CIX_FAST_CH_INT(cp->index)) {
+ cix_mbox_write(priv, CIX_FAST_CH_INT(cp->index), CIX_INT_CLEAR);
+ data = cix_mbox_read(priv, CIX_REG_F_INT(cp->index));
+ mbox_chan_received_data(chan, &data);
+ }
+}
+
+static irqreturn_t cix_mbox_isr(int irq, void *arg)
+{
+ struct mbox_chan *chan = arg;
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ struct cix_mbox_con_priv *cp = chan->con_priv;
+
+ switch (cp->type) {
+ case CIX_MBOX_TYPE_DB:
+ cix_mbox_isr_db(chan);
+ break;
+ case CIX_MBOX_TYPE_REG:
+ cix_mbox_isr_reg(chan);
+ break;
+ case CIX_MBOX_TYPE_FIFO:
+ cix_mbox_isr_fifo(chan);
+ break;
+ case CIX_MBOX_TYPE_FAST:
+ cix_mbox_isr_fast(chan);
+ break;
+ default:
+ dev_err(priv->dev, "Invalid channel type: %d\n", cp->type);
+ return IRQ_NONE;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int cix_mbox_startup(struct mbox_chan *chan)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ struct cix_mbox_con_priv *cp = chan->con_priv;
+ int index = cp->index, ret;
+ u32 val;
+
+ ret = request_irq(priv->irq, cix_mbox_isr, 0,
+ dev_name(priv->dev), chan);
+ if (ret) {
+ dev_err(priv->dev, "Unable to acquire IRQ %d\n", priv->irq);
+ return ret;
+ }
+
+ switch (cp->type) {
+ case CIX_MBOX_TYPE_DB:
+ /* Overwrite txdone_method for DB channel */
+ chan->txdone_method = TXDONE_BY_ACK;
+ fallthrough;
+ case CIX_MBOX_TYPE_REG:
+ if (priv->dir == CIX_MBOX_TX) {
+ /* Enable ACK interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE);
+ val |= CIX_ACK_INT;
+ cix_mbox_write(priv, val, CIX_INT_ENABLE);
+ } else {
+ /* Enable Doorbell interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+ val |= CIX_DB_INT;
+ cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+ }
+ break;
+ case CIX_MBOX_TYPE_FIFO:
+ /* reset fifo */
+ cix_mbox_write(priv, CIX_FIFO_RST_BIT, CIX_FIFO_RST);
+ /* set default watermark */
+ cix_mbox_write(priv, CIX_FIFO_WM_DEFAULT, CIX_FIFO_WM);
+ if (priv->dir == CIX_MBOX_TX) {
+ /* Enable fifo overflow interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE);
+ val |= CIX_FIFO_OFLOW_INT;
+ cix_mbox_write(priv, val, CIX_INT_ENABLE);
+ } else {
+ /* Enable fifo full/underflow interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+ val |= CIX_FIFO_UFLOW_INT|CIX_FIFO_WM01_INT;
+ cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+ }
+ break;
+ case CIX_MBOX_TYPE_FAST:
+ /* Only RX channel has intterupt */
+ if (priv->dir == CIX_MBOX_RX) {
+ if (index < 0 || index > CIX_MBOX_FAST_IDX) {
+ dev_err(priv->dev, "Invalid index %d\n", index);
+ ret = -EINVAL;
+ goto failed;
+ }
+ /* enable fast channel interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+ val |= CIX_FAST_CH_INT(index);
+ cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+ }
+ break;
+ default:
+ dev_err(priv->dev, "Invalid channel type: %d\n", cp->type);
+ ret = -EINVAL;
+ goto failed;
+ }
+ return 0;
+
+failed:
+ free_irq(priv->irq, chan);
+ return ret;
+}
+
+static void cix_mbox_shutdown(struct mbox_chan *chan)
+{
+ struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+ struct cix_mbox_con_priv *cp = chan->con_priv;
+ int index = cp->index;
+ u32 val;
+
+ switch (cp->type) {
+ case CIX_MBOX_TYPE_DB:
+ case CIX_MBOX_TYPE_REG:
+ if (priv->dir == CIX_MBOX_TX) {
+ /* Disable ACK interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE);
+ val &= ~CIX_ACK_INT;
+ cix_mbox_write(priv, val, CIX_INT_ENABLE);
+ } else if (priv->dir == CIX_MBOX_RX) {
+ /* Disable Doorbell interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+ val &= ~CIX_DB_INT;
+ cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+ }
+ break;
+ case CIX_MBOX_TYPE_FIFO:
+ if (priv->dir == CIX_MBOX_TX) {
+ /* Disable empty/fifo overflow irq*/
+ val = cix_mbox_read(priv, CIX_INT_ENABLE);
+ val &= ~(CIX_FIFO_EMPTY_INT | CIX_FIFO_OFLOW_INT);
+ cix_mbox_write(priv, val, CIX_INT_ENABLE);
+ } else if (priv->dir == CIX_MBOX_RX) {
+ /* Disable fifo WM01/underflow interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+ val &= ~(CIX_FIFO_UFLOW_INT | CIX_FIFO_WM01_INT);
+ cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+ }
+ break;
+ case CIX_MBOX_TYPE_FAST:
+ if (priv->dir == CIX_MBOX_RX) {
+ if (index < 0 || index > CIX_MBOX_FAST_IDX) {
+ dev_err(priv->dev, "Invalid index %d\n", index);
+ break;
+ }
+ /* Disable fast channel interrupt */
+ val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+ val &= ~CIX_FAST_CH_INT(index);
+ cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+ }
+ break;
+
+ default:
+ dev_err(priv->dev, "Invalid channel type: %d\n", cp->type);
+ break;
+ }
+
+ free_irq(priv->irq, chan);
+}
+
+static const struct mbox_chan_ops cix_mbox_chan_ops = {
+ .send_data = cix_mbox_send_data,
+ .startup = cix_mbox_startup,
+ .shutdown = cix_mbox_shutdown,
+};
+
+static void cix_mbox_init(struct cix_mbox_priv *priv)
+{
+ struct cix_mbox_con_priv *cp;
+ int i;
+
+ for (i = 0; i < CIX_MBOX_CHANS; i++) {
+ cp = &priv->con_priv[i];
+ cp->index = i;
+ cp->chan = &priv->mbox_chans[i];
+ priv->mbox_chans[i].con_priv = cp;
+ if (cp->index <= CIX_MBOX_FAST_IDX)
+ cp->type = CIX_MBOX_TYPE_FAST;
+ if (cp->index == CIX_MBOX_DB_IDX)
+ cp->type = CIX_MBOX_TYPE_DB;
+ if (cp->index == CIX_MBOX_FIFO_IDX)
+ cp->type = CIX_MBOX_TYPE_FIFO;
+ if (cp->index == CIX_MBOX_REG_IDX)
+ cp->type = CIX_MBOX_TYPE_REG;
+ }
+}
+
+static int cix_mbox_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cix_mbox_priv *priv;
+ struct resource *res;
+ const char *dir_str;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+ priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ /*
+ * The first 0x80 bytes of the register space of the cix mailbox controller
+ * can be used as shared memory for clients. When this shared memory is in
+ * use, the base address of the mailbox is offset by 0x80. Therefore, when
+ * performing subsequent read/write operations, it is necessary to subtract
+ * the offset CIX_SHMEM_OFFSET.
+ *
+ * When the base address of the mailbox is offset by 0x80, it indicates
+ * that shmem is in use.
+ */
+ priv->use_shmem = !!(res->start & CIX_SHMEM_OFFSET);
+
+ priv->irq = platform_get_irq(pdev, 0);
+ if (priv->irq < 0)
+ return priv->irq;
+
+ if (device_property_read_string(dev, "cix,mbox-dir", &dir_str)) {
+ dev_err(priv->dev, "cix,mbox_dir property not found\n");
+ return -EINVAL;
+ }
+
+ if (!strcmp(dir_str, "tx"))
+ priv->dir = 0;
+ else if (!strcmp(dir_str, "rx"))
+ priv->dir = 1;
+ else {
+ dev_err(priv->dev, "cix,mbox_dir=%s is not expected\n", dir_str);
+ return -EINVAL;
+ }
+
+ cix_mbox_init(priv);
+
+ priv->mbox.dev = dev;
+ priv->mbox.ops = &cix_mbox_chan_ops;
+ priv->mbox.chans = priv->mbox_chans;
+ priv->mbox.txdone_irq = true;
+ priv->mbox.num_chans = CIX_MBOX_CHANS;
+ priv->mbox.of_xlate = NULL;
+
+ platform_set_drvdata(pdev, priv);
+ ret = devm_mbox_controller_register(dev, &priv->mbox);
+ if (ret)
+ dev_err(dev, "Failed to register mailbox %d\n", ret);
+
+ return ret;
+}
+
+static const struct of_device_id cix_mbox_dt_ids[] = {
+ { .compatible = "cix,sky1-mbox" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, cix_mbox_dt_ids);
+
+static struct platform_driver cix_mbox_driver = {
+ .probe = cix_mbox_probe,
+ .driver = {
+ .name = "cix_mbox",
+ .of_match_table = cix_mbox_dt_ids,
+ },
+};
+
+static int __init cix_mailbox_init(void)
+{
+ return platform_driver_register(&cix_mbox_driver);
+}
+arch_initcall(cix_mailbox_init);
+
+MODULE_AUTHOR("Cix Technology Group Co., Ltd.");
+MODULE_DESCRIPTION("CIX mailbox driver");
+MODULE_LICENSE("GPL");
diff --git a/include/dt-bindings/clock/cix,sky1.h b/include/dt-bindings/clock/cix,sky1.h
new file mode 100644
index 000000000000..9245ebd1e80a
--- /dev/null
+++ b/include/dt-bindings/clock/cix,sky1.h
@@ -0,0 +1,279 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright 2024-2025 Cix Technology Group Co., Ltd.
+ */
+
+#ifndef _DT_BINDINGS_CLK_CIX_SKY1_H
+#define _DT_BINDINGS_CLK_CIX_SKY1_H
+
+#define CLK_TREE_CPU_GICxCLK 0
+#define CLK_TREE_CPU_PPUCLK 1
+#define CLK_TREE_CPU_PERIPHCLK 2
+#define CLK_TREE_DSU_CLK 3
+#define CLK_TREE_DSU_PCLK 4
+#define CLK_TREE_CPU_CLK_BC0 5
+#define CLK_TREE_CPU_CLK_BC1 6
+#define CLK_TREE_CPU_CLK_BC2 7
+#define CLK_TREE_CPU_CLK_BC3 8
+#define CLK_TREE_CPU_CLK_MC0 9
+#define CLK_TREE_CPU_CLK_MC1 10
+#define CLK_TREE_CPU_CLK_MC2 11
+#define CLK_TREE_CPU_CLK_MC3 12
+#define CLK_TREE_CPU_CLK_LC0 13
+#define CLK_TREE_CPU_CLK_LC1 14
+#define CLK_TREE_CPU_CLK_LC2 15
+#define CLK_TREE_CPU_CLK_LC3 16
+#define CLK_TREE_CSI_CTRL0_PCLK 17
+#define CLK_TREE_CSI_CTRL1_PCLK 18
+#define CLK_TREE_CSI_CTRL2_PCLK 19
+#define CLK_TREE_CSI_CTRL3_PCLK 20
+#define CLK_TREE_CSI_DMA0_PCLK 21
+#define CLK_TREE_CSI_DMA1_PCLK 22
+#define CLK_TREE_CSI_DMA2_PCLK 23
+#define CLK_TREE_CSI_DMA3_PCLK 24
+#define CLK_TREE_CSI_PHY0_PSM 25
+#define CLK_TREE_CSI_PHY1_PSM 26
+#define CLK_TREE_CSI_PHY0_APBCLK 27
+#define CLK_TREE_CSI_PHY1_APBCLK 28
+#define CLK_TREE_FCH_APB_CLK 29
+#define CLK_TREE_GPU_CLK_400M 30
+#define CLK_TREE_GPU_CLK_CORE 31
+#define CLK_TREE_GPU_CLK_STACKS 32
+#define CLK_TREE_DP0_PIXEL0 33
+#define CLK_TREE_DP0_PIXEL1 34
+#define CLK_TREE_DP1_PIXEL0 35
+#define CLK_TREE_DP1_PIXEL1 36
+#define CLK_TREE_DP2_PIXEL0 37
+#define CLK_TREE_DP2_PIXEL1 38
+#define CLK_TREE_DP3_PIXEL0 39
+#define CLK_TREE_DP3_PIXEL1 40
+#define CLK_TREE_DP4_PIXEL0 41
+#define CLK_TREE_DP4_PIXEL1 42
+#define CLK_TREE_DPU_CLK 43
+#define CLK_TREE_DPU0_ACLK 44
+#define CLK_TREE_DPU1_ACLK 45
+#define CLK_TREE_DPU2_ACLK 46
+#define CLK_TREE_DPU3_ACLK 47
+#define CLK_TREE_DPU4_ACLK 48
+#define CLK_TREE_DPC0_VIDCLK0 49
+#define CLK_TREE_DPC0_VIDCLK1 50
+#define CLK_TREE_DPC1_VIDCLK0 51
+#define CLK_TREE_DPC1_VIDCLK1 52
+#define CLK_TREE_DPC2_VIDCLK0 53
+#define CLK_TREE_DPC2_VIDCLK1 54
+#define CLK_TREE_DPC3_VIDCLK0 55
+#define CLK_TREE_DPC3_VIDCLK1 56
+#define CLK_TREE_DPC4_VIDCLK0 57
+#define CLK_TREE_DPC4_VIDCLK1 58
+#define CLK_TREE_DPC0_APBCLK 59
+#define CLK_TREE_DPC1_APBCLK 60
+#define CLK_TREE_DPC2_APBCLK 61
+#define CLK_TREE_DPC3_APBCLK 62
+#define CLK_TREE_DPC4_APBCLK 63
+#define CLK_TREE_NPU_MEMCLK 64
+#define CLK_TREE_NPU_SYSCLK 65
+#define CLK_TREE_NPU_DBGCLK 66
+#define CLK_TREE_VPU_APBCLK 67
+#define CLK_TREE_ISP_ACLK 68
+#define CLK_TREE_ISP_SCLK 69
+#define CLK_TREE_AUDIO_CLK4 70
+#define CLK_TREE_AUDIO_CLK5 71
+#define CLK_TREE_CAMERA_MCLK0 72
+#define CLK_TREE_CAMERA_MCLK1 73
+#define CLK_TREE_CAMERA_MCLK2 74
+#define CLK_TREE_CAMERA_MCLK3 75
+#define CLK_TREE_AUDIO_CLK0 76
+#define CLK_TREE_AUDIO_CLK1 77
+#define CLK_TREE_AUDIO_CLK2 78
+#define CLK_TREE_AUDIO_CLK3 79
+#define CLK_TREE_MM_NI700_CLK 80
+#define CLK_TREE_SYS_NI700_CLK 81
+#define CLK_TREE_GMAC0_ACLK 82
+#define CLK_TREE_GMAC1_ACLK 83
+#define CLK_TREE_GMAC0_DIV_ACLK 84
+#define CLK_TREE_GMAC0_DIV_TXCLK 85
+#define CLK_TREE_GMAC0_RGMII0_TXCLK 86
+#define CLK_TREE_GMAC1_DIV_ACLK 87
+#define CLK_TREE_GMAC1_DIV_TXCLK 88
+#define CLK_TREE_GMAC1_RGMII0_TXCLK 89
+#define CLK_TREE_GMAC0_PCLK 90
+#define CLK_TREE_GMAC1_PCLK 91
+#define CLK_TREE_USB2_0_AXI_GATE 92
+#define CLK_TREE_USB2_0_APB_GATE 93
+#define CLK_TREE_USB2_1_AXI_GATE 94
+#define CLK_TREE_USB2_1_APB_GATE 95
+#define CLK_TREE_USB2_2_AXI_GATE 96
+#define CLK_TREE_USB2_2_APB_GATE 97
+#define CLK_TREE_USB2_3_AXI_GATE 98
+#define CLK_TREE_USB2_3_APB_GATE 99
+#define CLK_TREE_USB2_0_PHY_GATE 100
+#define CLK_TREE_USB2_1_PHY_GATE 101
+#define CLK_TREE_USB2_2_PHY_GATE 102
+#define CLK_TREE_USB2_3_PHY_GATE 103
+#define CLK_TREE_USB3C_DRD_AXI_GATE 104
+#define CLK_TREE_USB3C_DRD_APB_GATE 105
+#define CLK_TREE_USB3C_DRD_PHY2_GATE 106
+#define CLK_TREE_USB3C_DRD_PHY3_GATE 107
+#define CLK_TREE_USB3C_0_AXI_GATE 108
+#define CLK_TREE_USB3C_0_APB_GATE 109
+#define CLK_TREE_USB3C_0_PHY2_GATE 110
+#define CLK_TREE_USB3C_0_PHY3_GATE 111
+#define CLK_TREE_USB3C_1_AXI_GATE 112
+#define CLK_TREE_USB3C_1_APB_GATE 113
+#define CLK_TREE_USB3C_1_PHY2_GATE 114
+#define CLK_TREE_USB3C_1_PHY3_GATE 115
+#define CLK_TREE_USB3C_2_AXI_GATE 116
+#define CLK_TREE_USB3C_2_APB_GATE 117
+#define CLK_TREE_USB3C_2_PHY2_GATE 118
+#define CLK_TREE_USB3C_2_PHY3_GATE 119
+#define CLK_TREE_USB3A_0_AXI_GATE 120
+#define CLK_TREE_USB3A_0_APB_GATE 121
+#define CLK_TREE_USB3A_0_PHY2_GATE 122
+#define CLK_TREE_USB3A_1_AXI_GATE 123
+#define CLK_TREE_USB3A_1_APB_GATE 124
+#define CLK_TREE_USB3A_1_PHY2_GATE 125
+#define CLK_TREE_USB3A_PHY3_GATE 126
+#define CLK_TREE_USB2_0_CLK_SOF 127
+#define CLK_TREE_USB2_1_CLK_SOF 128
+#define CLK_TREE_USB2_2_CLK_SOF 129
+#define CLK_TREE_USB2_3_CLK_SOF 130
+#define CLK_TREE_USB3C_DRD_CLK_SOF 131
+#define CLK_TREE_USB3C_H0_CLK_SOF 132
+#define CLK_TREE_USB3C_H1_CLK_SOF 133
+#define CLK_TREE_USB3C_H2_CLK_SOF 134
+#define CLK_TREE_USB3A_H0_CLK_SOF 135
+#define CLK_TREE_USB3A_H1_CLK_SOF 136
+#define CLK_TREE_USB2_0_CLK_LPM 137
+#define CLK_TREE_USB2_1_CLK_LPM 138
+#define CLK_TREE_USB2_2_CLK_LPM 139
+#define CLK_TREE_USB2_3_CLK_LPM 140
+#define CLK_TREE_USB3C_DRD_CLK_LPM 141
+#define CLK_TREE_USB3C_H0_CLK_LPM 142
+#define CLK_TREE_USB3C_H1_CLK_LPM 143
+#define CLK_TREE_USB3C_H2_CLK_LPM 144
+#define CLK_TREE_USB3A_H0_CLK_LPM 145
+#define CLK_TREE_USB3A_H1_CLK_LPM 146
+#define CLK_TREE_USB2_0_PHY_REF 147
+#define CLK_TREE_USB2_1_PHY_REF 148
+#define CLK_TREE_USB2_2_PHY_REF 149
+#define CLK_TREE_USB2_3_PHY_REF 150
+#define CLK_TREE_USB3C_DRD_PHY_REF 151
+#define CLK_TREE_USB3C_H0_PHY_REF 152
+#define CLK_TREE_USB3C_H1_PHY_REF 153
+#define CLK_TREE_USB3C_H2_PHY_REF 154
+#define CLK_TREE_USB3A_H0_PHY_REF 155
+#define CLK_TREE_USB3A_H1_PHY_REF 156
+#define CLK_TREE_USB3C_DRD_PHY_x4_REF 157
+#define CLK_TREE_USB3C_H0_PHY_x4_REF 158
+#define CLK_TREE_USB3C_H1_PHY_x4_REF 159
+#define CLK_TREE_USB3C_H2_PHY_x4_REF 160
+#define CLK_TREE_USB3A_PHY_x2_REF 161
+#define CLK_TREE_PCIE_X8CTRL_APB 162
+#define CLK_TREE_PCIE_X4CTRL_APB 163
+#define CLK_TREE_PCIE_X2CTRL_APB 164
+#define CLK_TREE_PCIE_X1_0CTRL_APB 165
+#define CLK_TREE_PCIE_X1_1CTRL_APB 166
+#define CLK_TREE_PCIE_X8_PHY_APB 167
+#define CLK_TREE_PCIE_X4_PHY_APB 168
+#define CLK_TREE_PCIE_X211_PHY_APB 169
+#define CLK_TREE_PCIE_NI700_CLK 170
+#define CLK_TREE_PCIE_CTRL0_CLK 171
+#define CLK_TREE_PCIE_CTRL1_CLK 172
+#define CLK_TREE_PCIE_CTRL2_CLK 173
+#define CLK_TREE_PCIE_CTRL3_CLK 174
+#define CLK_TREE_PCIE_CTRL4_CLK 175
+#define CLK_TREE_CSI_CTRL0_SYSCLK 176
+#define CLK_TREE_CSI_CTRL1_SYSCLK 177
+#define CLK_TREE_CSI_CTRL2_SYSCLK 178
+#define CLK_TREE_CSI_CTRL3_SYSCLK 179
+#define CLK_TREE_CSI_CTRL0_PIXEL0_CLK 180
+#define CLK_TREE_CSI_CTRL0_PIXEL1_CLK 181
+#define CLK_TREE_CSI_CTRL0_PIXEL2_CLK 182
+#define CLK_TREE_CSI_CTRL0_PIXEL3_CLK 183
+#define CLK_TREE_CSI_CTRL1_PIXEL0_CLK 184
+#define CLK_TREE_CSI_CTRL2_PIXEL0_CLK 185
+#define CLK_TREE_CSI_CTRL2_PIXEL1_CLK 186
+#define CLK_TREE_CSI_CTRL2_PIXEL2_CLK 187
+#define CLK_TREE_CSI_CTRL2_PIXEL3_CLK 188
+#define CLK_TREE_CSI_CTRL3_PIXEL0_CLK 189
+#define CLK_TREE_CI700_GCLK0 190
+#define CLK_TREE_DDRC0_ACLK_CLK 191
+#define CLK_TREE_DDRC1_ACLK_CLK 192
+#define CLK_TREE_DDRC2_ACLK_CLK 193
+#define CLK_TREE_DDRC3_ACLK_CLK 194
+#define CLK_TREE_DDRC0_DFICLK_CLK 195
+#define CLK_TREE_DDRC1_DFICLK_CLK 196
+#define CLK_TREE_DDRC2_DFICLK_CLK 197
+#define CLK_TREE_DDRC3_DFICLK_CLK 198
+#define CLK_TREE_PHY0_SYNC_CLK 199
+#define CLK_TREE_PHY1_SYNC_CLK 200
+#define CLK_TREE_PHY2_SYNC_CLK 201
+#define CLK_TREE_PHY3_SYNC_CLK 202
+#define CLK_TREE_PHY0_BYPASS_CLK 203
+#define CLK_TREE_PHY1_BYPASS_CLK 204
+#define CLK_TREE_PHY2_BYPASS_CLK 205
+#define CLK_TREE_PHY3_BYPASS_CLK 206
+#define CLK_TREE_DDRC_0_APB 207
+#define CLK_TREE_DDRC_1_APB 208
+#define CLK_TREE_DDRC_2_APB 209
+#define CLK_TREE_DDRC_3_APB 210
+#define CLK_TREE_TZC400_0_APB 211
+#define CLK_TREE_TZC400_1_APB 212
+#define CLK_TREE_TZC400_2_APB 213
+#define CLK_TREE_TZC400_3_APB 214
+#define CLK_TREE_S5_SENSOR_HUB_25M 215
+#define CLK_TREE_S5_SENSOR_HUB_400M 216
+#define CLK_TREE_S5_CSS600_100M 217
+#define CLK_TREE_S5_DFD_800M 218
+#define CLK_TREE_S5_CSU_SE_800M 219
+#define CLK_TREE_S5_CSU_PM_800M 220
+#define CLK_TREE_PCIE_REF_B0 221
+#define CLK_TREE_PCIE_REF_B1 222
+#define CLK_TREE_PCIE_REF_B2 223
+#define CLK_TREE_PCIE_REF_B3 224
+#define CLK_TREE_PCIE_REF_B4 225
+#define CLK_TREE_PCIE_REF_PHY_X8 226
+#define CLK_TREE_PCIE_REF_PHY_X4 227
+#define CLK_TREE_PCIE_REF_PHY_X211 228
+#define CLK_TREE_GMAC_REC_CLK 229
+#define CLK_TREE_GPUTOP_PLL 230
+#define CLK_TREE_GPUCORE_PLL 231
+#define CLK_TREE_CPU_PLL_LIT 232
+#define CLK_TREE_CPU_PLL0 233
+#define CLK_TREE_CPU_PLL1 234
+#define CLK_TREE_CPU_PLL2 235
+#define CLK_TREE_CPU_PLL3 236
+#define CLK_TREE_FCH_I3C0_FUNC 237
+#define CLK_TREE_FCH_I3C1_FUNC 238
+#define CLK_TREE_FCH_DMA_ACLK 239
+#define CLK_TREE_FCH_XSPI_FUNC 240
+#define CLK_TREE_FCH_XSPI_MACLK 241
+#define CLK_TREE_FCH_TIMER_FUN 242
+#define CLK_TREE_FCH_APB_IO_S0 243
+#define CLK_TREE_FCH_I3C0_APB 244
+#define CLK_TREE_FCH_I3C1_APB 245
+#define CLK_TREE_FCH_UART0_APB 246
+#define CLK_TREE_FCH_UART1_APB 247
+#define CLK_TREE_FCH_UART2_APB 248
+#define CLK_TREE_FCH_UART3_APB 249
+#define CLK_TREE_FCH_SPI0_APB 250
+#define CLK_TREE_FCH_SPI1_APB 251
+#define CLK_TREE_FCH_XSPI_APB 252
+#define CLK_TREE_FCH_I2C0_APB 253
+#define CLK_TREE_FCH_I2C1_APB 254
+#define CLK_TREE_FCH_I2C2_APB 255
+#define CLK_TREE_FCH_I2C3_APB 256
+#define CLK_TREE_FCH_I2C4_APB 257
+#define CLK_TREE_FCH_I2C5_APB 258
+#define CLK_TREE_FCH_I2C6_APB 259
+#define CLK_TREE_FCH_I2C7_APB 260
+#define CLK_TREE_FCH_TIMER_APB 261
+#define CLK_TREE_FCH_GPIO_APB 262
+#define CLK_TREE_FCH_UART0_FUNC 263
+#define CLK_TREE_FCH_UART1_FUNC 264
+#define CLK_TREE_FCH_UART2_FUNC 265
+#define CLK_TREE_FCH_UART3_FUNC 266
+/* 267~271 not used by AP, skip */
+#define CLK_TREE_GPU_CLK_200M 272
+
+#endif