xref: /linux/drivers/misc/issei/pci_heci.c (revision 93e4b3076b5f2d853462b9777d083c77fc0b7b23)

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023-2026 Intel Corporation */
#include <linux/device.h>
#include <linux/dev_printk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pm.h>

#include "cdev.h"
#include "hw_heci.h"
#include "hw_heci_regs.h"

static int issei_heci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct device *dev = &pdev->dev;
	const struct hw_heci_cfg *cfg;
	struct issei_device *idev;
	struct issei_heci_hw *hw;
	char __iomem *registers;
	int err;

	cfg = issei_heci_get_cfg(ent->driver_data);
	if (!cfg)
		return dev_err_probe(dev, -ENODEV, "no usable configuration.\n");

	err = pcim_enable_device(pdev);
	if (err)
		return dev_err_probe(dev, err, "failed to enable pci device.\n");

	pci_set_master(pdev);

	registers = pcim_iomap_region(pdev, 0, KBUILD_MODNAME);
	if (IS_ERR(registers))
		return dev_err_probe(dev, PTR_ERR(registers), "failed to get pci region.\n");

	err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
	if (err)
		return dev_err_probe(dev, err, "no usable DMA configuration.\n");

	idev = issei_register(sizeof(*hw), dev, &cfg->dma_length, issei_heci_get_ops());
	if (IS_ERR(idev))
		return dev_err_probe(dev, PTR_ERR(idev), "register failure.\n");

	issei_heci_dev_init(idev, registers, cfg);

	pci_set_drvdata(pdev, idev);

	err = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
	if (err < 0) {
		dev_err_probe(dev, err, "pci_alloc_irq_vectors failure.\n");
		goto deregister;
	}

	hw = to_heci_hw(idev);
	hw->irq = pci_irq_vector(pdev, 0);

	err = request_threaded_irq(hw->irq,
				   issei_heci_irq_quick_handler,
				   NULL,
				   IRQF_SHARED, KBUILD_MODNAME, idev);
	if (err)
		goto release_irq;

	err = issei_start(idev);
	if (err) {
		dev_err_probe(dev, err, "init hw failure.\n");
		goto free_irq;
	}

	return 0;

free_irq:
	idev->ops->irq_disable(idev);
	free_irq(hw->irq, idev);
release_irq:
	pci_free_irq_vectors(pdev);
deregister:
	issei_deregister(idev);
	return err;
}

static void issei_heci_shutdown(struct pci_dev *pdev)
{
	struct issei_device *idev = pci_get_drvdata(pdev);
	struct issei_heci_hw *hw = to_heci_hw(idev);

	issei_stop(idev);

	idev->ops->irq_disable(idev);
	free_irq(hw->irq, idev);
	pci_free_irq_vectors(pdev);
}

static void issei_heci_remove(struct pci_dev *pdev)
{
	issei_heci_shutdown(pdev);

	issei_deregister(pci_get_drvdata(pdev));
}

static int issei_heci_pm_suspend(struct device *device)
{
	struct issei_device *idev = dev_get_drvdata(device);

	issei_stop(idev);
	idev->ops->irq_disable(idev);

	return 0;
}

static int issei_heci_pm_resume(struct device *device)
{
	struct issei_device *idev = dev_get_drvdata(device);

	return issei_start(idev);
}

static const struct dev_pm_ops issei_heci_pm_ops = {
	SYSTEM_SLEEP_PM_OPS(issei_heci_pm_suspend, issei_heci_pm_resume)
};

static const struct pci_device_id heci_pci_tbl[] = {
	{PCI_VDEVICE(INTEL, 0xA85D)}, /* Lunar Lake M */
	{PCI_VDEVICE(INTEL, 0xE35D)}, /* Panther Lake H */
	{PCI_VDEVICE(INTEL, 0xE45D)}, /* Panther Lake P */
	{PCI_VDEVICE(INTEL, 0xD470)}, /* Nova Lake S */
	{PCI_VDEVICE(INTEL, 0xD358)}, /* Nova Lake H */
	{PCI_VDEVICE(INTEL, 0x4D5D)}, /* Wildcat Lake */
	{}
};
MODULE_DEVICE_TABLE(pci, heci_pci_tbl);

static struct pci_driver issei_heci_driver = {
	.name = KBUILD_MODNAME,
	.id_table = heci_pci_tbl,
	.probe = issei_heci_probe,
	.remove = issei_heci_remove,
	.shutdown = issei_heci_shutdown,
	.driver = {
		.pm = &issei_heci_pm_ops,
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
	},
};
module_pci_driver(issei_heci_driver);

MODULE_DESCRIPTION("Intel(R) Silicon Security Engine Interface - HECI");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("INTEL_SSEI");