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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 <raag.jadav@intel.com> Acked-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20251112034040.457801-2-raag.jadav@intel.com Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Intel Elkhart Lake Programmable Service Engine (PSE) I/O
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*
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* Copyright (c) 2025 Intel Corporation.
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*
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* Author: Raag Jadav <raag.jadav@intel.com>
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*/
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#include <linux/auxiliary_bus.h>
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#include <linux/device/devres.h>
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#include <linux/errno.h>
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#include <linux/gfp_types.h>
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#include <linux/ioport.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/sizes.h>
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#include <linux/types.h>
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#include <linux/ehl_pse_io_aux.h>
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#define EHL_PSE_IO_DEV_SIZE SZ_4K
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static int ehl_pse_io_dev_create(struct pci_dev *pci, const char *name, int idx)
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{
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struct device *dev = &pci->dev;
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struct auxiliary_device *adev;
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struct ehl_pse_io_data *data;
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resource_size_t start, offset;
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u32 id;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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id = (pci_domain_nr(pci->bus) << 16) | pci_dev_id(pci);
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start = pci_resource_start(pci, 0);
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offset = EHL_PSE_IO_DEV_SIZE * idx;
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data->mem = DEFINE_RES_MEM(start + offset, EHL_PSE_IO_DEV_SIZE);
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data->irq = pci_irq_vector(pci, idx);
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adev = __devm_auxiliary_device_create(dev, EHL_PSE_IO_NAME, name, data, id);
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return adev ? 0 : -ENODEV;
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}
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static int ehl_pse_io_probe(struct pci_dev *pci, const struct pci_device_id *id)
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{
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int ret;
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ret = pcim_enable_device(pci);
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if (ret)
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return ret;
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pci_set_master(pci);
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ret = pci_alloc_irq_vectors(pci, 2, 2, PCI_IRQ_MSI);
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if (ret < 0)
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return ret;
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ret = ehl_pse_io_dev_create(pci, EHL_PSE_GPIO_NAME, 0);
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if (ret)
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return ret;
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return ehl_pse_io_dev_create(pci, EHL_PSE_TIO_NAME, 1);
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}
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static const struct pci_device_id ehl_pse_io_ids[] = {
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{ PCI_VDEVICE(INTEL, 0x4b88) },
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{ PCI_VDEVICE(INTEL, 0x4b89) },
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{ }
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};
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MODULE_DEVICE_TABLE(pci, ehl_pse_io_ids);
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static struct pci_driver ehl_pse_io_driver = {
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.name = EHL_PSE_IO_NAME,
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.id_table = ehl_pse_io_ids,
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.probe = ehl_pse_io_probe,
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};
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module_pci_driver(ehl_pse_io_driver);
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MODULE_AUTHOR("Raag Jadav <raag.jadav@intel.com>");
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MODULE_DESCRIPTION("Intel Elkhart Lake PSE I/O driver");
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MODULE_LICENSE("GPL");
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