// SPDX-License-Identifier: GPL-2.0-only
/*
 * B0D4 processor thermal device
 * Copyright (c) 2020, Intel Corporation.
 */

#include <linux/acpi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/thermal.h>

#include "int340x_thermal_zone.h"
#include "processor_thermal_device.h"
#include "../intel_soc_dts_iosf.h"

#define DRV_NAME "proc_thermal"

static irqreturn_t proc_thermal_pci_msi_irq(int irq, void *devid)
{
	struct proc_thermal_device *proc_priv;
	struct pci_dev *pdev = devid;

	proc_priv = pci_get_drvdata(pdev);

	intel_soc_dts_iosf_interrupt_handler(proc_priv->soc_dts);

	return IRQ_HANDLED;
}

static int proc_thermal_pci_probe(struct pci_dev *pdev,
				  const struct pci_device_id *id)
{
	struct proc_thermal_device *proc_priv;
	int ret;

	ret = pcim_enable_device(pdev);
	if (ret < 0) {
		dev_err(&pdev->dev, "error: could not enable device\n");
		return ret;
	}

	proc_priv = devm_kzalloc(&pdev->dev, sizeof(*proc_priv), GFP_KERNEL);
	if (!proc_priv)
		return -ENOMEM;

	ret = proc_thermal_add(&pdev->dev, proc_priv);
	if (ret)
		return ret;

	pci_set_drvdata(pdev, proc_priv);

	if (pdev->device == PCI_DEVICE_ID_INTEL_BSW_THERMAL) {
		/*
		 * Enumerate additional DTS sensors available via IOSF.
		 * But we are not treating as a failure condition, if
		 * there are no aux DTSs enabled or fails. This driver
		 * already exposes sensors, which can be accessed via
		 * ACPI/MSR. So we don't want to fail for auxiliary DTSs.
		 */
		proc_priv->soc_dts = intel_soc_dts_iosf_init(
					INTEL_SOC_DTS_INTERRUPT_MSI, 2, 0);

		if (!IS_ERR(proc_priv->soc_dts) && pdev->irq) {
			ret = pci_enable_msi(pdev);
			if (!ret) {
				ret = request_threaded_irq(pdev->irq, NULL,
						proc_thermal_pci_msi_irq,
						IRQF_ONESHOT, "proc_thermal",
						pdev);
				if (ret) {
					intel_soc_dts_iosf_exit(
							proc_priv->soc_dts);
					pci_disable_msi(pdev);
					proc_priv->soc_dts = NULL;
				}
			}
		} else
			dev_err(&pdev->dev, "No auxiliary DTSs enabled\n");
	} else {

	}

	ret = proc_thermal_mmio_add(pdev, proc_priv, id->driver_data);
	if (ret) {
		proc_thermal_remove(proc_priv);
		return ret;
	}

	return 0;
}

static void proc_thermal_pci_remove(struct pci_dev *pdev)
{
	struct proc_thermal_device *proc_priv = pci_get_drvdata(pdev);

	if (proc_priv->soc_dts) {
		intel_soc_dts_iosf_exit(proc_priv->soc_dts);
		if (pdev->irq) {
			free_irq(pdev->irq, pdev);
			pci_disable_msi(pdev);
		}
	}

	proc_thermal_mmio_remove(pdev, proc_priv);
	proc_thermal_remove(proc_priv);
}

#ifdef CONFIG_PM_SLEEP
static int proc_thermal_pci_resume(struct device *dev)
{
	return proc_thermal_resume(dev);
}
#else
#define proc_thermal_pci_resume NULL
#endif

static SIMPLE_DEV_PM_OPS(proc_thermal_pci_pm, NULL, proc_thermal_pci_resume);

static const struct pci_device_id proc_thermal_pci_ids[] = {
	{ PCI_DEVICE_DATA(INTEL, BDW_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, BSW_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, BXT0_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, BXT1_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, BXTX_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, BXTP_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, CNL_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, CFL_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, GLK_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, HSB_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, ICL_THERMAL, PROC_THERMAL_FEATURE_RAPL) },
	{ PCI_DEVICE_DATA(INTEL, JSL_THERMAL, 0) },
	{ PCI_DEVICE_DATA(INTEL, SKL_THERMAL, PROC_THERMAL_FEATURE_RAPL) },
	{ PCI_DEVICE_DATA(INTEL, TGL_THERMAL, PROC_THERMAL_FEATURE_RAPL | PROC_THERMAL_FEATURE_FIVR | PROC_THERMAL_FEATURE_MBOX) },
	{ },
};

MODULE_DEVICE_TABLE(pci, proc_thermal_pci_ids);

static struct pci_driver proc_thermal_pci_driver = {
	.name		= DRV_NAME,
	.probe		= proc_thermal_pci_probe,
	.remove		= proc_thermal_pci_remove,
	.id_table	= proc_thermal_pci_ids,
	.driver.pm	= &proc_thermal_pci_pm,
};

static int __init proc_thermal_init(void)
{
	return pci_register_driver(&proc_thermal_pci_driver);
}

static void __exit proc_thermal_exit(void)
{
	pci_unregister_driver(&proc_thermal_pci_driver);
}

module_init(proc_thermal_init);
module_exit(proc_thermal_exit);

MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver");
MODULE_LICENSE("GPL v2");