Input Output Manager (IOM) is part of the Tiger Lake SoC that configures the Type-C Sub System (TCSS). IOM is a micro controller that handles Type-C topology, configuration and PM functions of various Type-C devices connected on the platform.
This driver helps read relevant information such as Type-C port status (whether a device is connected to a Type-C port or not) and the activity type on the Type-C ports (such as USB, Display Port, Thunderbolt), for consumption by other drivers. Currently intel_iom_port_status() API is exported by this driver, that has information about the Type-C port status and port activity type. Signed-off-by: Rajmohan Mani <[email protected]> --- drivers/platform/x86/Kconfig | 16 +++ drivers/platform/x86/Makefile | 1 + drivers/platform/x86/intel_iom.c | 133 ++++++++++++++++++++ include/linux/platform_data/x86/intel_iom.h | 62 +++++++++ 4 files changed, 212 insertions(+) create mode 100644 drivers/platform/x86/intel_iom.c create mode 100644 include/linux/platform_data/x86/intel_iom.h diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 0581a54cf562..271feddb20ef 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -816,6 +816,22 @@ config INTEL_INT0002_VGPIO To compile this driver as a module, choose M here: the module will be called intel_int0002_vgpio. +config INTEL_IOM + tristate "Intel Input Output Manager (IOM) driver" + depends on ACPI && PCI + help + This driver helps read relevant information such as Type-C port + status (whether a device is connected to a Type-C port or not) + and the activity type on the Type-C ports (such as USB, Display + Port, Thunderbolt), for consumption by other drivers. + + Currently intel_iom_port_status() API is exported by this driver, + that has information about the Type-C port status and port activity + type. + + To compile this driver as a module, choose M here: the module will + be called intel_iom. + config INTEL_MENLOW tristate "Thermal Management driver for Intel menlow platform" depends on ACPI_THERMAL diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 2b85852a1a87..d71e4620a7c6 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -76,6 +76,7 @@ intel_cht_int33fe-objs := intel_cht_int33fe_common.o \ intel_cht_int33fe_microb.o obj-$(CONFIG_INTEL_HID_EVENT) += intel-hid.o obj-$(CONFIG_INTEL_INT0002_VGPIO) += intel_int0002_vgpio.o +obj-$(CONFIG_INTEL_IOM) += intel_iom.o obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o obj-$(CONFIG_INTEL_VBTN) += intel-vbtn.o diff --git a/drivers/platform/x86/intel_iom.c b/drivers/platform/x86/intel_iom.c new file mode 100644 index 000000000000..ece0fe720b2d --- /dev/null +++ b/drivers/platform/x86/intel_iom.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel Core SoC Input Output Manager (IOM) driver. + * + * This driver provides access to the Input Output Manager (IOM) (that + * is part of Tiger Lake SoC) registers that can be used to know about + * Type-C Sub System related information (such as Type-C port status, + * activity type on Type-C ports). + * + * Copyright (C) 2020, Intel Corporation + * Author: Rajmohan Mani <[email protected]> + */ + +#include <linux/io.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_data/x86/intel_iom.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#define IOM_PORT_STATUS_OFFSET 0x560 + +struct intel_iom { + struct device *dev; + void __iomem *regbar; +}; + +static struct intel_iom iom_dev; + +/** + * intel_iom_get() - Get IOM device instance + * + * This function returns the IOM device instance. This also ensures that + * this driver cannot be unloaded while the caller has the instance. + * + * Call intel_iom_put() to release the instance. + * + * Returns IOM device instance on success or error pointer otherwise. + */ +struct intel_iom *intel_iom_get(void) +{ + struct device *dev = get_device(iom_dev.dev); + + /* Prevent this driver from being unloaded while in use */ + if (!try_module_get(dev->driver->owner)) { + put_device(iom_dev.dev); + return ERR_PTR(-EBUSY); + } + + return &iom_dev; +} +EXPORT_SYMBOL_GPL(intel_iom_get); + +/** + * intel_iom_put() - Put IOM device instance + * @iom: IOM device instance + * + * This function releases the IOM device instance created using + * intel_iom_get() and allows the driver to be unloaded. + * + * Call intel_iom_put() to release the instance. + */ +void intel_iom_put(struct intel_iom *iom) +{ + if (!iom) + return; + + module_put(iom->dev->driver->owner); + put_device(iom->dev); +} +EXPORT_SYMBOL_GPL(intel_iom_put); + +/** + * intel_iom_port_status() - Get status bits for the Type-C port + * @iom: IOM device instance + * @port: Type-C port number + * @status: pointer to receive the status bits + * + * Returns 0 on success, error otherwise. + */ +int intel_iom_port_status(struct intel_iom *iom, u8 port, u32 *status) +{ + void __iomem *reg; + + if (!iom) + return -ENODEV; + + if (!status || (port > IOM_MAX_PORTS - 1)) + return -EINVAL; + + reg = iom->regbar + IOM_PORT_STATUS_OFFSET + IOM_REG_LEN * port; + + *status = ioread32(reg); + + return 0; +} +EXPORT_SYMBOL_GPL(intel_iom_port_status); + +static int intel_iom_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + void __iomem *addr; + + addr = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(addr)) + return PTR_ERR(addr); + + iom_dev.regbar = addr; + + iom_dev.dev = dev; + dev_set_drvdata(dev, &iom_dev); + return 0; +} + +static const struct acpi_device_id intel_iom_acpi_ids[] = { + { "INTC1072" }, + {} +}; +MODULE_DEVICE_TABLE(acpi, intel_iom_acpi_ids); + +static struct platform_driver intel_iom_driver = { + .probe = intel_iom_probe, + .driver = { + .name = "intel_iom", + .acpi_match_table = intel_iom_acpi_ids, + }, +}; + +module_platform_driver_probe(intel_iom_driver, intel_iom_probe); + +MODULE_AUTHOR("Rajmohan Mani <[email protected]>"); +MODULE_DESCRIPTION("Intel IOM driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/platform_data/x86/intel_iom.h b/include/linux/platform_data/x86/intel_iom.h new file mode 100644 index 000000000000..d86c60b25a44 --- /dev/null +++ b/include/linux/platform_data/x86/intel_iom.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _PLATFORM_DATA_X86_INTEL_IOM_H_ +#define _PLATFORM_DATA_X86_INTEL_IOM_H_ + +#include <linux/bits.h> +#include <linux/types.h> + +/* Input Output Manager (IOM) PORT STATUS */ +#define IOM_PORT_STATUS_ACTIVITY_TYPE_MASK GENMASK(9, 6) +#define IOM_PORT_STATUS_ACTIVITY_TYPE_SHIFT 0x06 +#define IOM_PORT_STATUS_ACTIVITY_TYPE_USB 0x03 +/* activity type: Safe Mode */ +#define IOM_PORT_STATUS_ACTIVITY_TYPE_SAFE_MODE 0x04 +/* activity type: Display Port */ +#define IOM_PORT_STATUS_ACTIVITY_TYPE_DP 0x05 +/* activity type: Display Port Multi Function Device */ +#define IOM_PORT_STATUS_ACTIVITY_TYPE_DP_MFD 0x06 +/* activity type: Thunderbolt */ +#define IOM_PORT_STATUS_ACTIVITY_TYPE_TBT 0x07 +#define IOM_PORT_STATUS_ACTIVITY_TYPE_ALT_MODE_USB 0x0c +#define IOM_PORT_STATUS_ACTIVITY_TYPE_ALT_MODE_TBT_USB 0x0d +/* Upstream Facing Port Information */ +#define IOM_PORT_STATUS_UFP BIT(10) +/* Display Port Hot Plug Detect status */ +#define IOM_PORT_STATUS_DHPD_HPD_STATUS_MASK GENMASK(13, 12) +#define IOM_PORT_STATUS_DHPD_HPD_STATUS_SHIFT 0x0c +#define IOM_PORT_STATUS_DHPD_HPD_STATUS_ASSERT 0x01 +#define IOM_PORT_STATUS_DHPD_HPD_SOURCE_TBT BIT(14) +#define IOM_PORT_STATUS_CONNECTED BIT(31) + +#define IOM_MAX_PORTS 4 +/* Register length in bytes */ +#define IOM_REG_LEN 4 + +struct intel_iom; + +#ifdef CONFIG_ACPI + +struct intel_iom *intel_iom_get(void); +void intel_iom_put(struct intel_iom *iom); +int intel_iom_port_status(struct intel_iom *iom, u8 port, u32 *status); + +#else + +struct intel_iom *intel_iom_get(void) +{ + return NULL; +} + +void intel_iom_put(struct intel_iom *iom) +{ +} + +int intel_iom_port_status(struct intel_iom *iom, u8 port, u32 *status) +{ + return 0; +} + +#endif + +#endif /* _PLATFORM_DATA_X86_INTEL_IOM_H_ */ -- 2.20.1
