This driver provides support for P-Unit mailbox IPC on Intel platforms.
The heart of the P-Unit is the Foxton microcontroller and its firmware,
which provide mailbox interface for power management usage.
Signed-off-by: Qipeng Zha <qipeng.zha@xxxxxxxxx>
---
change in v5
Fix commend style in header file;
Replace EINVAL with ENODEV in stub functions;
Replace ipc_err_sources array with ipc_err_string function;
Correct comments: "if invalid" -> "if not used";
Propagate return error of devm_request_irq.
change in v4
Fix two code style issues: make /* as a whole line and replace
"return ret" with "goto out";
Replace -EINVAL with -ENXIO for failures due to resource.
change in v3
Fix compile issue in intel_punit_ipc.h, it happened when built-in
and the header file is included in other source file.
change in v2
Fix issues in code style and comments;
Remove "default y" in Kconfig;
Remove some header files;
Replace request_mem_region with devm_request_mem_region,
and same for request_irq;
Change to use prefix of IPC_PUNIT_ to define commands;
---
MAINTAINERS | 4 +-
arch/x86/include/asm/intel_punit_ipc.h | 102 ++++++++++
drivers/platform/x86/Kconfig | 6 +
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/intel_punit_ipc.c | 353 +++++++++++++++++++++++++++++++++
5 files changed, 465 insertions(+), 1 deletion(-)
create mode 100644 arch/x86/include/asm/intel_punit_ipc.h
create mode 100644 drivers/platform/x86/intel_punit_ipc.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 13ac861..cf71387 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5207,12 +5207,14 @@ F: include/uapi/linux/mei.h
F: drivers/misc/mei/*
F: Documentation/misc-devices/mei/*
-INTEL PMC IPC DRIVER
+INTEL PMC/P-Unit IPC DRIVER
M: Zha Qipeng<qipeng.zha@xxxxxxxxx>
L: platform-driver-x86@xxxxxxxxxxxxxxx
S: Maintained
F: drivers/platform/x86/intel_pmc_ipc.c
+F: drivers/platform/x86/intel_punit_ipc.c
F: arch/x86/include/asm/intel_pmc_ipc.h
+F: arch/x86/include/asm/intel_punit_ipc.h
IOC3 ETHERNET DRIVER
M: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
diff --git a/arch/x86/include/asm/intel_punit_ipc.h b/arch/x86/include/asm/intel_punit_ipc.h
new file mode 100644
index 0000000..8cd00be
--- /dev/null
+++ b/arch/x86/include/asm/intel_punit_ipc.h
@@ -0,0 +1,102 @@
+#ifndef _ASM_X86_INTEL_PUNIT_IPC_H_
+#define _ASM_X86_INTEL_PUNIT_IPC_H_
+
+/*
+ * Commands supported on CPU core, are handled by different bars,
+ * unify these commands together here.
+ */
+#define IPC_PUNIT_BIOS_CMD_BASE 0x00
+#define IPC_PUNIT_GTD_CMD_BASE 0x20
+#define IPC_PUNIT_ISPD_CMD_BASE 0x40
+
+/* BIOS => Pcode commands */
+#define IPC_PUNIT_BIOS_CMD_ZERO (IPC_PUNIT_BIOS_CMD_BASE + 0x00)
+#define IPC_PUNIT_BIOS_CMD_VR_INTERFACE (IPC_PUNIT_BIOS_CMD_BASE + 0x01)
+#define IPC_PUNIT_BIOS_CMD_READ_PCS (IPC_PUNIT_BIOS_CMD_BASE + 0x02)
+#define IPC_PUNIT_BIOS_CMD_WRITE_PCS (IPC_PUNIT_BIOS_CMD_BASE + 0x03)
+#define IPC_PUNIT_BIOS_CMD_READ_PCU_CONFIG (IPC_PUNIT_BIOS_CMD_BASE + 0x04)
+#define IPC_PUNIT_BIOS_CMD_WRITE_PCU_CONFIG (IPC_PUNIT_BIOS_CMD_BASE + 0x05)
+#define IPC_PUNIT_BIOS_CMD_READ_PL1_SETTING (IPC_PUNIT_BIOS_CMD_BASE + 0x06)
+#define IPC_PUNIT_BIOS_WRITE_PL1_SETTING (IPC_PUNIT_BIOS_CMD_BASE + 0x07)
+#define IPC_PUNIT_BIOS_CMD_TRIGGER_VDD_RAM (IPC_PUNIT_BIOS_CMD_BASE + 0x08)
+#define IPC_PUNIT_BIOS_CMD_READ_TELE_INFO (IPC_PUNIT_BIOS_CMD_BASE + 0x09)
+#define IPC_PUNIT_BIOS_CMD_READ_TELE_TRACE_CTRL (IPC_PUNIT_BIOS_CMD_BASE + 0x0a)
+#define IPC_PUNIT_BIOS_CMD_WRITE_TELE_TRACE_CTRL \
+ (IPC_PUNIT_BIOS_CMD_BASE + 0x0b)
+#define IPC_PUNIT_BIOS_CMD_READ_TELE_EVENT_CTRL (IPC_PUNIT_BIOS_CMD_BASE + 0x0c)
+#define IPC_PUNIT_BIOS_CMD_WRITE_TELE_EVENT_CTRL \
+ (IPC_PUNIT_BIOS_CMD_BASE + 0x0d)
+#define IPC_PUNIT_BIOS_CMD_READ_TELE_TRACE (IPC_PUNIT_BIOS_CMD_BASE + 0x0e)
+#define IPC_PUNIT_BIOS_CMD_WRITE_TELE_TRACE (IPC_PUNIT_BIOS_CMD_BASE + 0x0f)
+#define IPC_PUNIT_BIOS_CMD_READ_TELE_EVENT (IPC_PUNIT_BIOS_CMD_BASE + 0x10)
+#define IPC_PUNIT_BIOS_CMD_WRITE_TELE_EVENT (IPC_PUNIT_BIOS_CMD_BASE + 0x11)
+#define IPC_PUNIT_BIOS_CMD_READ_MODULE_TEMP (IPC_PUNIT_BIOS_CMD_BASE + 0x12)
+#define IPC_PUNIT_BIOS_CMD_RESERVED (IPC_PUNIT_BIOS_CMD_BASE + 0x13)
+#define IPC_PUNIT_BIOS_CMD_READ_VOLTAGE_OVER (IPC_PUNIT_BIOS_CMD_BASE + 0x14)
+#define IPC_PUNIT_BIOS_CMD_WRITE_VOLTAGE_OVER (IPC_PUNIT_BIOS_CMD_BASE + 0x15)
+#define IPC_PUNIT_BIOS_CMD_READ_RATIO_OVER (IPC_PUNIT_BIOS_CMD_BASE + 0x16)
+#define IPC_PUNIT_BIOS_CMD_WRITE_RATIO_OVER (IPC_PUNIT_BIOS_CMD_BASE + 0x17)
+#define IPC_PUNIT_BIOS_CMD_READ_VF_GL_CTRL (IPC_PUNIT_BIOS_CMD_BASE + 0x18)
+#define IPC_PUNIT_BIOS_CMD_WRITE_VF_GL_CTRL (IPC_PUNIT_BIOS_CMD_BASE + 0x19)
+#define IPC_PUNIT_BIOS_CMD_READ_FM_SOC_TEMP_THRESH \
+ (IPC_PUNIT_BIOS_CMD_BASE + 0x1a)
+#define IPC_PUNIT_BIOS_CMD_WRITE_FM_SOC_TEMP_THRESH \
+ (IPC_PUNIT_BIOS_CMD_BASE + 0x1b)
+
+/* GT Driver => Pcode commands */
+#define IPC_PUNIT_GTD_CMD_ZERO (IPC_PUNIT_GTD_CMD_BASE + 0x00)
+#define IPC_PUNIT_GTD_CMD_CONFIG (IPC_PUNIT_GTD_CMD_BASE + 0x01)
+#define IPC_PUNIT_GTD_CMD_READ_ICCP_LIC_CDYN_SCAL \
+ (IPC_PUNIT_GTD_CMD_BASE + 0x02)
+#define IPC_PUNIT_GTD_CMD_WRITE_ICCP_LIC_CDYN_SCAL \
+ (IPC_PUNIT_GTD_CMD_BASE + 0x03)
+#define IPC_PUNIT_GTD_CMD_GET_WM_VAL (IPC_PUNIT_GTD_CMD_BASE + 0x06)
+#define IPC_PUNIT_GTD_CMD_WRITE_CONFIG_WISHREQ (IPC_PUNIT_GTD_CMD_BASE + 0x07)
+#define IPC_PUNIT_GTD_CMD_READ_REQ_DUTY_CYCLE (IPC_PUNIT_GTD_CMD_BASE + 0x16)
+#define IPC_PUNIT_GTD_CMD_DIS_VOL_FREQ_CHANGE_REQUEST \
+ (IPC_PUNIT_GTD_CMD_BASE + 0x17)
+#define IPC_PUNIT_GTD_CMD_DYNA_DUTY_CYCLE_CTRL (IPC_PUNIT_GTD_CMD_BASE + 0x1a)
+#define IPC_PUNIT_GTD_CMD_DYNA_DUTY_CYCLE_TUNING \
+ (IPC_PUNIT_GTD_CMD_BASE + 0x1c)
+
+/* ISP Driver => Pcode commands */
+#define IPC_PUNIT_ISPD_CMD_ZERO (IPC_PUNIT_ISPD_CMD_BASE + 0x00)
+#define IPC_PUNIT_ISPD_CMD_CONFIG (IPC_PUNIT_ISPD_CMD_BASE + 0x01)
+#define IPC_PUNIT_ISPD_CMD_GET_ISP_LTR_VAL (IPC_PUNIT_ISPD_CMD_BASE + 0x02)
+#define IPC_PUNIT_ISPD_CMD_ACCESS_IU_FREQ_BOUNDS \
+ (IPC_PUNIT_ISPD_CMD_BASE + 0x03)
+#define IPC_PUNIT_ISPD_CMD_READ_CDYN_LEVEL (IPC_PUNIT_ISPD_CMD_BASE + 0x04)
+#define IPC_PUNIT_ISPD_CMD_WRITE_CDYN_LEVEL (IPC_PUNIT_ISPD_CMD_BASE + 0x05)
+#define IPC_PUNIT_ISPD_CMD_MAX (IPC_PUNIT_ISPD_CMD_BASE + 0x06)
+
+/* Error codes */
+#define IPC_PUNIT_ERR_SUCCESS 0
+#define IPC_PUNIT_ERR_INVALID_CMD 1
+#define IPC_PUNIT_ERR_INVALID_PARAMETER 2
+#define IPC_PUNIT_ERR_CMD_TIMEOUT 3
+#define IPC_PUNIT_ERR_CMD_LOCKED 4
+#define IPC_PUNIT_ERR_INVALID_VR_ID 5
+#define IPC_PUNIT_ERR_VR_ERR 6
+
+#if IS_ENABLED(CONFIG_INTEL_PUNIT_IPC)
+
+int intel_punit_ipc_simple_command(int cmd, int para1, int para2);
+int intel_punit_ipc_command(u32 cmd, u32 para1, u32 para2, u32 *in, u32 *out);
+
+#else
+
+static inline int intel_punit_ipc_simple_command(int cmd,
+ int para1, int para2)
+{
+ return -ENODEV;
+}
+
+static inline int intel_punit_ipc_command(u32 cmd, u32 para1, u32 para2,
+ u32 *in, u32 *out)
+{
+ return -ENODEV;
+}
+
+#endif /* CONFIG_INTEL_PUNIT_IPC */
+
+#endif
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 346f1fd..9948369 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -891,4 +891,10 @@ config INTEL_PMC_IPC
The PMC is an ARC processor which defines IPC commands for communication
with other entities in the CPU.
+config INTEL_PUNIT_IPC
+ tristate "Intel P-Unit IPC Driver"
+ ---help---
+ This driver provides support for Intel P-Unit Mailbox IPC mechanism,
+ which is used to bridge the communications between kernel and P-Unit.
+
endif # X86_PLATFORM_DEVICES
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 1051372..eea765f 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -59,3 +59,4 @@ obj-$(CONFIG_INTEL_SMARTCONNECT) += intel-smartconnect.o
obj-$(CONFIG_PVPANIC) += pvpanic.o
obj-$(CONFIG_ALIENWARE_WMI) += alienware-wmi.o
obj-$(CONFIG_INTEL_PMC_IPC) += intel_pmc_ipc.o
+obj-$(CONFIG_INTEL_PUNIT_IPC) += intel_punit_ipc.o
diff --git a/drivers/platform/x86/intel_punit_ipc.c b/drivers/platform/x86/intel_punit_ipc.c
new file mode 100644
index 0000000..52ef978
--- /dev/null
+++ b/drivers/platform/x86/intel_punit_ipc.c
@@ -0,0 +1,353 @@
+/*
+ * Driver for the Intel P-Unit Mailbox IPC mechanism
+ *
+ * (C) Copyright 2015 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * The heart of the P-Unit is the Foxton microcontroller and its firmware,
+ * which provide mailbox interface for power management usage.
+ */
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <asm/intel_punit_ipc.h>
+
+/* Mailbox registers */
+#define MAILBOX_DATA_LOW 0x0
+#define MAILBOX_INTERFACE 0x4
+#define CMD_RUN (1 << 31)
+#define CMD_ERRCODE_MASK 0xFF
+#define CMD_PARA1_SHIFT 8
+#define CMD_PARA2_SHIFT 16
+#define CMD_MASK 0xFF
+#define MAILBOX_DATA_HIGH 0x8
+
+#define MAILBOX_REGISTER_SPACE 0x10
+
+#define CMD_TIMEOUT_SECONDS 3
+
+/* Three external mailbox */
+enum mailbox_type {
+ BIOS_MAILBOX,
+ GTDRIVER_MAILBOX,
+ ISPDRIVER_MAILBOX,
+ RESERVED_MAILBOX,
+};
+
+struct intel_punit_ipc_controller {
+ struct platform_device *pdev;
+ struct mutex lock;
+ void __iomem *base[RESERVED_MAILBOX];
+ struct completion cmd_complete;
+ int irq;
+
+ int cmd;
+ enum mailbox_type type;
+} ipcdev;
+
+static inline u32 ipc_read_status(void)
+{
+ return readl(ipcdev.base[ipcdev.type] + MAILBOX_INTERFACE);
+}
+
+static inline void ipc_write_cmd(u32 cmd)
+{
+ writel(cmd, ipcdev.base[ipcdev.type] + MAILBOX_INTERFACE);
+}
+
+static inline u32 ipc_read_data_low(void)
+{
+ return readl(ipcdev.base[ipcdev.type] + MAILBOX_DATA_LOW);
+}
+
+static inline u32 ipc_read_data_high(void)
+{
+ return readl(ipcdev.base[ipcdev.type] + MAILBOX_DATA_HIGH);
+}
+
+static inline void ipc_write_data_low(u32 data)
+{
+ writel(data, ipcdev.base[ipcdev.type] + MAILBOX_DATA_LOW);
+}
+
+static inline void ipc_write_data_high(u32 data)
+{
+ writel(data, ipcdev.base[ipcdev.type] + MAILBOX_DATA_HIGH);
+}
+
+static int intel_punit_ipc_send_command(u32 cmd)
+{
+ ipcdev.cmd = cmd;
+
+ cmd &= CMD_MASK;
+ if (cmd < IPC_PUNIT_BIOS_CMD_BASE)
+ return -EINVAL;
+ else if (cmd < IPC_PUNIT_GTD_CMD_BASE)
+ ipcdev.type = BIOS_MAILBOX;
+ else if (cmd < IPC_PUNIT_ISPD_CMD_BASE) {
+ ipcdev.type = GTDRIVER_MAILBOX;
+ ipcdev.cmd -= IPC_PUNIT_GTD_CMD_BASE;
+ } else if (cmd < IPC_PUNIT_ISPD_CMD_MAX) {
+ ipcdev.type = ISPDRIVER_MAILBOX;
+ ipcdev.cmd -= IPC_PUNIT_ISPD_CMD_BASE;
+ } else
+ return -EINVAL;
+
+ reinit_completion(&ipcdev.cmd_complete);
+ ipc_write_cmd(ipcdev.cmd);
+
+ return 0;
+}
+
+static char *ipc_err_string(int error)
+{
+ if (error == IPC_PUNIT_ERR_SUCCESS)
+ return "no error";
+ else if (error == IPC_PUNIT_ERR_INVALID_CMD)
+ return "invalid command";
+ else if (error == IPC_PUNIT_ERR_INVALID_PARAMETER)
+ return "invalid parameter";
+ else if (error == IPC_PUNIT_ERR_CMD_TIMEOUT)
+ return "command timeout";
+ else if (error == IPC_PUNIT_ERR_CMD_LOCKED)
+ return "command locked";
+ else if (error == IPC_PUNIT_ERR_INVALID_VR_ID)
+ return "invalid vr id";
+ else if (error == IPC_PUNIT_ERR_VR_ERR)
+ return "vr error";
+ else
+ return "unknown error";
+}
+
+static int intel_punit_ipc_check_status(void)
+{
+ int loops = CMD_TIMEOUT_SECONDS * USEC_PER_SEC;
+ int errcode;
+ int status;
+
+ if (ipcdev.irq) {
+ if (!wait_for_completion_timeout(
+ &ipcdev.cmd_complete,
+ CMD_TIMEOUT_SECONDS * HZ)) {
+ dev_err(&ipcdev.pdev->dev,
+ "IPC timed out, IPC_CMD=0x%x\n", ipcdev.cmd);
+ return -ETIMEDOUT;
+ }
+ } else {
+ while ((ipc_read_status() & CMD_RUN) && --loops)
+ udelay(1);
+ if (!loops) {
+ dev_err(&ipcdev.pdev->dev,
+ "IPC timed out, IPC_CMD=0x%x\n", ipcdev.cmd);
+ return -ETIMEDOUT;
+ }
+ }
+
+ status = ipc_read_status();
+ errcode = status & CMD_ERRCODE_MASK;
+ if (errcode) {
+ dev_err(&ipcdev.pdev->dev,
+ "IPC failed: %s, IPC_STS=0x%x, IPC_CMD=0x%x\n",
+ ipc_err_string(errcode), status, ipcdev.cmd);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/**
+ * intel_punit_ipc_simple_command() - Simple IPC command
+ * @cmd: IPC command code.
+ * @para1: First 8bit parameter, set 0 if not used.
+ * @para2: Second 8bit parameter, set 0 if not used.
+ *
+ * Send a IPC command to P-Unit when there is no data transaction
+ *
+ * Return: IPC error code or 0 on success.
+ */
+int intel_punit_ipc_simple_command(int cmd, int para1, int para2)
+{
+ int ret;
+
+ mutex_lock(&ipcdev.lock);
+ ret = intel_punit_ipc_send_command(CMD_RUN |
+ para2 << CMD_PARA2_SHIFT |
+ para1 << CMD_PARA1_SHIFT | cmd);
+ if (ret)
+ goto out;
+ ret = intel_punit_ipc_check_status();
+out:
+ mutex_unlock(&ipcdev.lock);
+ return ret;
+}
+EXPORT_SYMBOL(intel_punit_ipc_simple_command);
+
+/**
+ * intel_punit_ipc_command() - IPC command with data and pointers
+ * @cmd: IPC command code.
+ * @para1: First 8bit parameter, set 0 if not used.
+ * @para2: Second 8bit parameter, set 0 if not used.
+ * @in: Input data, 32bit for BIOS cmd, two 32bit for GTD and ISPD.
+ * @out: Output data.
+ *
+ * Send a IPC command to P-Unit with data transaction
+ *
+ * Return: IPC error code or 0 on success.
+ */
+int intel_punit_ipc_command(u32 cmd, u32 para1, u32 para2, u32 *in, u32 *out)
+{
+ int ret;
+
+ mutex_lock(&ipcdev.lock);
+ ipc_write_data_low(*in);
+ if (ipcdev.type == GTDRIVER_MAILBOX ||
+ ipcdev.type == ISPDRIVER_MAILBOX) {
+ in++;
+ ipc_write_data_high(*in);
+ }
+ ret = intel_punit_ipc_send_command(CMD_RUN |
+ para2 << CMD_PARA2_SHIFT |
+ para1 << CMD_PARA1_SHIFT | cmd);
+ if (ret)
+ goto out;
+ ret = intel_punit_ipc_check_status();
+ if (ret)
+ goto out;
+ *out = ipc_read_data_low();
+ if (ipcdev.type == GTDRIVER_MAILBOX ||
+ ipcdev.type == ISPDRIVER_MAILBOX) {
+ out++;
+ *out = ipc_read_data_high();
+ }
+out:
+ mutex_unlock(&ipcdev.lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(intel_punit_ipc_command);
+
+static irqreturn_t intel_punit_ioc(int irq, void *dev_id)
+{
+ complete(&ipcdev.cmd_complete);
+ return IRQ_HANDLED;
+}
+
+static int intel_punit_get_bars(struct platform_device *pdev)
+{
+ struct resource *res0, *res1;
+ void __iomem *addr;
+ int size;
+
+ res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res0) {
+ dev_err(&pdev->dev, "Failed to get iomem resource\n");
+ return -ENXIO;
+ }
+ size = resource_size(res0);
+ if (!devm_request_mem_region(&pdev->dev, res0->start,
+ size, pdev->name)) {
+ dev_err(&pdev->dev, "Failed to request iomem resouce\n");
+ return -EBUSY;
+ }
+
+ res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res1) {
+ dev_err(&pdev->dev, "Failed to get iomem resource1\n");
+ return -ENXIO;
+ }
+ size = resource_size(res1);
+ if (!devm_request_mem_region(&pdev->dev, res1->start,
+ size, pdev->name)) {
+ dev_err(&pdev->dev, "Failed to request iomem resouce1\n");
+ return -EBUSY;
+ }
+
+ addr = ioremap_nocache(res0->start,
+ resource_size(res0) + resource_size(res1));
+ if (!addr) {
+ dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
+ return -ENOMEM;
+ }
+ ipcdev.base[BIOS_MAILBOX] = addr;
+ addr += MAILBOX_REGISTER_SPACE;
+ ipcdev.base[GTDRIVER_MAILBOX] = addr;
+ addr += MAILBOX_REGISTER_SPACE;
+ ipcdev.base[ISPDRIVER_MAILBOX] = addr;
+
+ return 0;
+}
+
+static int intel_punit_ipc_probe(struct platform_device *pdev)
+{
+ int irq, ret;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ipcdev.irq = 0;
+ dev_warn(&pdev->dev, "Invalid IRQ\n");
+ } else {
+ ret = devm_request_irq(&pdev->dev, irq, intel_punit_ioc,
+ IRQF_NO_SUSPEND, "intel_punit_ipc",
+ &ipcdev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request irq: %d\n", irq);
+ return ret;
+ }
+ ipcdev.irq = irq;
+ }
+
+ ret = intel_punit_get_bars(pdev);
+ if (ret)
+ goto out;
+
+ ipcdev.pdev = pdev;
+ mutex_init(&ipcdev.lock);
+ init_completion(&ipcdev.cmd_complete);
+
+out:
+ return ret;
+}
+
+static int intel_punit_ipc_remove(struct platform_device *pdev)
+{
+ iounmap(ipcdev.base[BIOS_MAILBOX]);
+
+ return 0;
+}
+
+static const struct acpi_device_id punit_ipc_acpi_ids[] = {
+ {"INT34D4", 0}
+};
+
+static struct platform_driver intel_punit_ipc_driver = {
+ .probe = intel_punit_ipc_probe,
+ .remove = intel_punit_ipc_remove,
+ .driver = {
+ .name = "intel_punit_ipc",
+ .acpi_match_table = ACPI_PTR(punit_ipc_acpi_ids),
+ },
+};
+
+static int __init intel_punit_ipc_init(void)
+{
+ return platform_driver_register(&intel_punit_ipc_driver);
+}
+
+static void __exit intel_punit_ipc_exit(void)
+{
+ platform_driver_unregister(&intel_punit_ipc_driver);
+}
+
+MODULE_AUTHOR("Zha Qipeng <qipeng.zha@xxxxxxxxx>");
+MODULE_DESCRIPTION("Intel P-Unit IPC driver");
+MODULE_LICENSE("GPL v2");
+
+/* Some modules are dependent on this, so init earlier */
+fs_initcall(intel_punit_ipc_init);
+module_exit(intel_punit_ipc_exit);
--
1.8.3.2
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