From: Raag Jadav Date: Wed, 12 Nov 2025 03:40:10 +0000 (+0530) Subject: platform/x86/intel: Introduce Intel Elkhart Lake PSE I/O X-Git-Tag: v6.19-rc1~146^2~29 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a0c83150eea5807dbedf786f55cd49b14af118a8;p=thirdparty%2Flinux.git platform/x86/intel: Introduce Intel Elkhart Lake PSE I/O Intel Elkhart Lake Programmable Service Engine (PSE) includes two PCI devices that expose two different capabilities of GPIO and Timed I/O as a single PCI function through shared MMIO with below layout. GPIO: 0x0000 - 0x1000 TIO: 0x1000 - 0x2000 This driver enumerates the PCI parent device and creates auxiliary child devices for these capabilities. The actual functionalities are provided by their respective auxiliary drivers. Signed-off-by: Raag Jadav Acked-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20251112034040.457801-2-raag.jadav@intel.com Signed-off-by: Bartosz Golaszewski --- diff --git a/MAINTAINERS b/MAINTAINERS index 3da2c26a796b8..00e2cb65ddecf 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12505,6 +12505,13 @@ F: drivers/gpu/drm/xe/ F: include/drm/intel/ F: include/uapi/drm/xe_drm.h +INTEL ELKHART LAKE PSE I/O DRIVER +M: Raag Jadav +L: platform-driver-x86@vger.kernel.org +S: Supported +F: drivers/platform/x86/intel/ehl_pse_io.c +F: include/linux/ehl_pse_io_aux.h + INTEL ETHERNET DRIVERS M: Tony Nguyen M: Przemek Kitszel diff --git a/drivers/platform/x86/intel/Kconfig b/drivers/platform/x86/intel/Kconfig index 19a2246f27702..2900407d60955 100644 --- a/drivers/platform/x86/intel/Kconfig +++ b/drivers/platform/x86/intel/Kconfig @@ -41,6 +41,19 @@ config INTEL_VBTN To compile this driver as a module, choose M here: the module will be called intel_vbtn. +config INTEL_EHL_PSE_IO + tristate "Intel Elkhart Lake PSE I/O driver" + depends on PCI + select AUXILIARY_BUS + help + Select this option to enable Intel Elkhart Lake PSE GPIO and Timed + I/O support. This driver enumerates the PCI parent device and + creates auxiliary child devices for these capabilities. The actual + functionalities are provided by their respective auxiliary drivers. + + To compile this driver as a module, choose M here: the module will + be called intel_ehl_pse_io. + config INTEL_INT0002_VGPIO tristate "Intel ACPI INT0002 Virtual GPIO driver" depends on GPIOLIB && ACPI && PM_SLEEP diff --git a/drivers/platform/x86/intel/Makefile b/drivers/platform/x86/intel/Makefile index 78acb414e1540..138b137561583 100644 --- a/drivers/platform/x86/intel/Makefile +++ b/drivers/platform/x86/intel/Makefile @@ -21,6 +21,7 @@ intel-target-$(CONFIG_INTEL_HID_EVENT) += hid.o intel-target-$(CONFIG_INTEL_VBTN) += vbtn.o # Intel miscellaneous drivers +intel-target-$(CONFIG_INTEL_EHL_PSE_IO) += ehl_pse_io.o intel-target-$(CONFIG_INTEL_INT0002_VGPIO) += int0002_vgpio.o intel-target-$(CONFIG_INTEL_ISHTP_ECLITE) += ishtp_eclite.o intel-target-$(CONFIG_INTEL_OAKTRAIL) += oaktrail.o diff --git a/drivers/platform/x86/intel/ehl_pse_io.c b/drivers/platform/x86/intel/ehl_pse_io.c new file mode 100644 index 0000000000000..861e14808b35e --- /dev/null +++ b/drivers/platform/x86/intel/ehl_pse_io.c @@ -0,0 +1,86 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel Elkhart Lake Programmable Service Engine (PSE) I/O + * + * Copyright (c) 2025 Intel Corporation. + * + * Author: Raag Jadav + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define EHL_PSE_IO_DEV_SIZE SZ_4K + +static int ehl_pse_io_dev_create(struct pci_dev *pci, const char *name, int idx) +{ + struct device *dev = &pci->dev; + struct auxiliary_device *adev; + struct ehl_pse_io_data *data; + resource_size_t start, offset; + u32 id; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + id = (pci_domain_nr(pci->bus) << 16) | pci_dev_id(pci); + start = pci_resource_start(pci, 0); + offset = EHL_PSE_IO_DEV_SIZE * idx; + + data->mem = DEFINE_RES_MEM(start + offset, EHL_PSE_IO_DEV_SIZE); + data->irq = pci_irq_vector(pci, idx); + + adev = __devm_auxiliary_device_create(dev, EHL_PSE_IO_NAME, name, data, id); + + return adev ? 0 : -ENODEV; +} + +static int ehl_pse_io_probe(struct pci_dev *pci, const struct pci_device_id *id) +{ + int ret; + + ret = pcim_enable_device(pci); + if (ret) + return ret; + + pci_set_master(pci); + + ret = pci_alloc_irq_vectors(pci, 2, 2, PCI_IRQ_MSI); + if (ret < 0) + return ret; + + ret = ehl_pse_io_dev_create(pci, EHL_PSE_GPIO_NAME, 0); + if (ret) + return ret; + + return ehl_pse_io_dev_create(pci, EHL_PSE_TIO_NAME, 1); +} + +static const struct pci_device_id ehl_pse_io_ids[] = { + { PCI_VDEVICE(INTEL, 0x4b88) }, + { PCI_VDEVICE(INTEL, 0x4b89) }, + { } +}; +MODULE_DEVICE_TABLE(pci, ehl_pse_io_ids); + +static struct pci_driver ehl_pse_io_driver = { + .name = EHL_PSE_IO_NAME, + .id_table = ehl_pse_io_ids, + .probe = ehl_pse_io_probe, +}; +module_pci_driver(ehl_pse_io_driver); + +MODULE_AUTHOR("Raag Jadav "); +MODULE_DESCRIPTION("Intel Elkhart Lake PSE I/O driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/ehl_pse_io_aux.h b/include/linux/ehl_pse_io_aux.h new file mode 100644 index 0000000000000..afb8587ee5fb1 --- /dev/null +++ b/include/linux/ehl_pse_io_aux.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Intel Elkhart Lake PSE I/O Auxiliary Device + * + * Copyright (c) 2025 Intel Corporation. + * + * Author: Raag Jadav + */ + +#ifndef _EHL_PSE_IO_AUX_H_ +#define _EHL_PSE_IO_AUX_H_ + +#include + +#define EHL_PSE_IO_NAME "ehl_pse_io" +#define EHL_PSE_GPIO_NAME "gpio" +#define EHL_PSE_TIO_NAME "pps_tio" + +struct ehl_pse_io_data { + struct resource mem; + int irq; +}; + +#endif /* _EHL_PSE_IO_AUX_H_ */