drivers/i2c/busses/i2c-designware-pcidrv.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Synopsys DesignWare I2C adapter driver (master only).
  *
  * Based on the TI DAVINCI I2C adapter driver.
  *
  * Copyright (C) 2006 Texas Instruments.
  * Copyright (C) 2007 MontaVista Software Inc.
  * Copyright (C) 2009 Provigent Ltd.
  * Copyright (C) 2011, 2015, 2016 Intel Corporation.
  */
 #include <linux/acpi.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/pm_runtime.h>
 #include <linux/power_supply.h>
 #include <linux/sched.h>
 #include <linux/slab.h>

 #include "i2c-designware-core.h"
 #include "i2c-ccgx-ucsi.h"

 #define DRIVER_NAME "i2c-designware-pci"

 enum dw_pci_ctl_id_t {
 	medfield,
 	merrifield,
 	baytrail,
 	cherrytrail,
 	haswell,
 	elkhartlake,
 	navi_amd,
 };

 /*
  * This is a legacy structure to describe the hardware counters
  * to configure signal timings on the bus. For Device Tree platforms
  * one should use the respective properties and for ACPI there is
  * a set of ACPI methods that provide these counters. No new
  * platform should use this structure.
  */
 struct dw_scl_sda_cfg {
 	u16 ss_hcnt;
 	u16 fs_hcnt;
 	u16 ss_lcnt;
 	u16 fs_lcnt;
 	u32 sda_hold;
 };

 struct dw_pci_controller {
 	u32 bus_num;
 	u32 flags;
 	struct dw_scl_sda_cfg *scl_sda_cfg;
 	int (*setup)(struct pci_dev *pdev, struct dw_pci_controller *c);
 	u32 (*get_clk_rate_khz)(struct dw_i2c_dev *dev);
 };

 /* Merrifield HCNT/LCNT/SDA hold time */
 static struct dw_scl_sda_cfg mrfld_config = {
 	.ss_hcnt = 0x2f8,
 	.fs_hcnt = 0x87,
 	.ss_lcnt = 0x37b,
 	.fs_lcnt = 0x10a,
 };

 /* BayTrail HCNT/LCNT/SDA hold time */
 static struct dw_scl_sda_cfg byt_config = {
 	.ss_hcnt = 0x200,
 	.fs_hcnt = 0x55,
 	.ss_lcnt = 0x200,
 	.fs_lcnt = 0x99,
 	.sda_hold = 0x6,
 };

 /* Haswell HCNT/LCNT/SDA hold time */
 static struct dw_scl_sda_cfg hsw_config = {
 	.ss_hcnt = 0x01b0,
 	.fs_hcnt = 0x48,
 	.ss_lcnt = 0x01fb,
 	.fs_lcnt = 0xa0,
 	.sda_hold = 0x9,
 };

 /* NAVI-AMD HCNT/LCNT/SDA hold time */
 static struct dw_scl_sda_cfg navi_amd_config = {
 	.ss_hcnt = 0x1ae,
 	.ss_lcnt = 0x23a,
 	.sda_hold = 0x9,
 };

 static u32 mfld_get_clk_rate_khz(struct dw_i2c_dev *dev)
 {
 	return 25000;
 }

 static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
 {
 	struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev);

 	switch (pdev->device) {
 	case 0x0817:
 		dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
 		fallthrough;
 	case 0x0818:
 	case 0x0819:
 		c->bus_num = pdev->device - 0x817 + 3;
 		return 0;
 	case 0x082C:
 	case 0x082D:
 	case 0x082E:
 		c->bus_num = pdev->device - 0x82C + 0;
 		return 0;
 	}
 	return -ENODEV;
 }

 static int mrfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
 {
 	/*
 	 * On Intel Merrifield the user visible i2c buses are enumerated
 	 * [1..7]. So, we add 1 to shift the default range. Besides that the
 	 * first PCI slot provides 4 functions, that's why we have to add 0 to
 	 * the first slot and 4 to the next one.
 	 */
 	switch (PCI_SLOT(pdev->devfn)) {
 	case 8:
 		c->bus_num = PCI_FUNC(pdev->devfn) + 0 + 1;
 		return 0;
 	case 9:
 		c->bus_num = PCI_FUNC(pdev->devfn) + 4 + 1;
 		return 0;
 	}
 	return -ENODEV;
 }

 static u32 ehl_get_clk_rate_khz(struct dw_i2c_dev *dev)
 {
 	return 100000;
 }

 static u32 navi_amd_get_clk_rate_khz(struct dw_i2c_dev *dev)
 {
 	return 100000;
 }

 static int navi_amd_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
 {
 	struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev);

 	dev->flags |= MODEL_AMD_NAVI_GPU | ACCESS_POLLING;
 	dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
 	return 0;
 }

 static struct dw_pci_controller dw_pci_controllers[] = {
 	[medfield] = {
 		.bus_num = -1,
 		.setup = mfld_setup,
 		.get_clk_rate_khz = mfld_get_clk_rate_khz,
 	},
 	[merrifield] = {
 		.bus_num = -1,
 		.scl_sda_cfg = &mrfld_config,
 		.setup = mrfld_setup,
 	},
 	[baytrail] = {
 		.bus_num = -1,
 		.scl_sda_cfg = &byt_config,
 	},
 	[haswell] = {
 		.bus_num = -1,
 		.scl_sda_cfg = &hsw_config,
 	},
 	[cherrytrail] = {
 		.bus_num = -1,
 		.scl_sda_cfg = &byt_config,
 	},
 	[elkhartlake] = {
 		.bus_num = -1,
 		.get_clk_rate_khz = ehl_get_clk_rate_khz,
 	},
 	[navi_amd] = {
 		.bus_num = -1,
 		.scl_sda_cfg = &navi_amd_config,
 		.setup =  navi_amd_setup,
 		.get_clk_rate_khz = navi_amd_get_clk_rate_khz,
 	},
 };

 static int __maybe_unused i2c_dw_pci_runtime_suspend(struct device *dev)
 {
 	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);

 	i_dev->disable(i_dev);
 	return 0;
 }

 static int __maybe_unused i2c_dw_pci_suspend(struct device *dev)
 {
 	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);

 	i2c_mark_adapter_suspended(&i_dev->adapter);

 	return i2c_dw_pci_runtime_suspend(dev);
 }

 static int __maybe_unused i2c_dw_pci_runtime_resume(struct device *dev)
 {
 	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);

 	return i_dev->init(i_dev);
 }

 static int __maybe_unused i2c_dw_pci_resume(struct device *dev)
 {
 	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
 	int ret;

 	ret = i2c_dw_pci_runtime_resume(dev);

 	i2c_mark_adapter_resumed(&i_dev->adapter);

 	return ret;
 }

 static const struct dev_pm_ops i2c_dw_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume)
 	SET_RUNTIME_PM_OPS(i2c_dw_pci_runtime_suspend, i2c_dw_pci_runtime_resume, NULL)
 };

 static const struct property_entry dgpu_properties[] = {
 	/* USB-C doesn't power the system */
 	PROPERTY_ENTRY_U8("scope", POWER_SUPPLY_SCOPE_DEVICE),
 	{}
 };

 static const struct software_node dgpu_node = {
 	.properties = dgpu_properties,
 };

 static int i2c_dw_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *id)
 {
 	struct dw_i2c_dev *dev;
 	struct i2c_adapter *adap;
 	int r;
 	struct dw_pci_controller *controller;
 	struct dw_scl_sda_cfg *cfg;
 	struct i2c_timings *t;

 	if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers))
 		return dev_err_probe(&pdev->dev, -EINVAL,
 				     "Invalid driver data %ld\n",
 				     id->driver_data);

 	controller = &dw_pci_controllers[id->driver_data];

 	r = pcim_enable_device(pdev);
 	if (r)
 		return dev_err_probe(&pdev->dev, r,
 				     "Failed to enable I2C PCI device\n");

 	pci_set_master(pdev);

 	r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
 	if (r)
 		return dev_err_probe(&pdev->dev, r,
 				     "I/O memory remapping failed\n");

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

 	r = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
 	if (r < 0)
 		return r;

 	dev->get_clk_rate_khz = controller->get_clk_rate_khz;
 	dev->base = pcim_iomap_table(pdev)[0];
 	dev->dev = &pdev->dev;
 	dev->irq = pci_irq_vector(pdev, 0);
 	dev->flags |= controller->flags;

 	t = &dev->timings;
 	i2c_parse_fw_timings(&pdev->dev, t, false);

 	pci_set_drvdata(pdev, dev);

 	if (controller->setup) {
 		r = controller->setup(pdev, controller);
 		if (r) {
 			pci_free_irq_vectors(pdev);
 			return r;
 		}
 	}

 	i2c_dw_adjust_bus_speed(dev);

 	if (has_acpi_companion(&pdev->dev))
 		i2c_dw_acpi_configure(&pdev->dev);

 	r = i2c_dw_validate_speed(dev);
 	if (r) {
 		pci_free_irq_vectors(pdev);
 		return r;
 	}

 	i2c_dw_configure(dev);

 	if (controller->scl_sda_cfg) {
 		cfg = controller->scl_sda_cfg;
 		dev->ss_hcnt = cfg->ss_hcnt;
 		dev->fs_hcnt = cfg->fs_hcnt;
 		dev->ss_lcnt = cfg->ss_lcnt;
 		dev->fs_lcnt = cfg->fs_lcnt;
 		dev->sda_hold_time = cfg->sda_hold;
 	}

 	adap = &dev->adapter;
 	adap->owner = THIS_MODULE;
 	adap->class = 0;
 	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
 	adap->nr = controller->bus_num;

 	r = i2c_dw_probe(dev);
 	if (r) {
 		pci_free_irq_vectors(pdev);
 		return r;
 	}

 	if ((dev->flags & MODEL_MASK) == MODEL_AMD_NAVI_GPU) {
 		dev->slave = i2c_new_ccgx_ucsi(&dev->adapter, dev->irq, &dgpu_node);
 		if (IS_ERR(dev->slave))
 			return dev_err_probe(dev->dev, PTR_ERR(dev->slave),
 					     "register UCSI failed\n");
 	}

 	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_put_autosuspend(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);

 	return 0;
 }

 static void i2c_dw_pci_remove(struct pci_dev *pdev)
 {
 	struct dw_i2c_dev *dev = pci_get_drvdata(pdev);

 	dev->disable(dev);
 	pm_runtime_forbid(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);

 	i2c_del_adapter(&dev->adapter);
 	devm_free_irq(&pdev->dev, dev->irq, dev);
 	pci_free_irq_vectors(pdev);
 }

 static const struct pci_device_id i2_designware_pci_ids[] = {
 	/* Medfield */
 	{ PCI_VDEVICE(INTEL, 0x0817), medfield },
 	{ PCI_VDEVICE(INTEL, 0x0818), medfield },
 	{ PCI_VDEVICE(INTEL, 0x0819), medfield },
 	{ PCI_VDEVICE(INTEL, 0x082C), medfield },
 	{ PCI_VDEVICE(INTEL, 0x082D), medfield },
 	{ PCI_VDEVICE(INTEL, 0x082E), medfield },
 	/* Merrifield */
 	{ PCI_VDEVICE(INTEL, 0x1195), merrifield },
 	{ PCI_VDEVICE(INTEL, 0x1196), merrifield },
 	/* Baytrail */
 	{ PCI_VDEVICE(INTEL, 0x0F41), baytrail },
 	{ PCI_VDEVICE(INTEL, 0x0F42), baytrail },
 	{ PCI_VDEVICE(INTEL, 0x0F43), baytrail },
 	{ PCI_VDEVICE(INTEL, 0x0F44), baytrail },
 	{ PCI_VDEVICE(INTEL, 0x0F45), baytrail },
 	{ PCI_VDEVICE(INTEL, 0x0F46), baytrail },
 	{ PCI_VDEVICE(INTEL, 0x0F47), baytrail },
 	/* Haswell */
 	{ PCI_VDEVICE(INTEL, 0x9c61), haswell },
 	{ PCI_VDEVICE(INTEL, 0x9c62), haswell },
 	/* Braswell / Cherrytrail */
 	{ PCI_VDEVICE(INTEL, 0x22C1), cherrytrail },
 	{ PCI_VDEVICE(INTEL, 0x22C2), cherrytrail },
 	{ PCI_VDEVICE(INTEL, 0x22C3), cherrytrail },
 	{ PCI_VDEVICE(INTEL, 0x22C4), cherrytrail },
 	{ PCI_VDEVICE(INTEL, 0x22C5), cherrytrail },
 	{ PCI_VDEVICE(INTEL, 0x22C6), cherrytrail },
 	{ PCI_VDEVICE(INTEL, 0x22C7), cherrytrail },
 	/* Elkhart Lake (PSE I2C) */
 	{ PCI_VDEVICE(INTEL, 0x4bb9), elkhartlake },
 	{ PCI_VDEVICE(INTEL, 0x4bba), elkhartlake },
 	{ PCI_VDEVICE(INTEL, 0x4bbb), elkhartlake },
 	{ PCI_VDEVICE(INTEL, 0x4bbc), elkhartlake },
 	{ PCI_VDEVICE(INTEL, 0x4bbd), elkhartlake },
 	{ PCI_VDEVICE(INTEL, 0x4bbe), elkhartlake },
 	{ PCI_VDEVICE(INTEL, 0x4bbf), elkhartlake },
 	{ PCI_VDEVICE(INTEL, 0x4bc0), elkhartlake },
 	/* AMD NAVI */
 	{ PCI_VDEVICE(ATI,  0x7314), navi_amd },
 	{ PCI_VDEVICE(ATI,  0x73a4), navi_amd },
 	{ PCI_VDEVICE(ATI,  0x73e4), navi_amd },
 	{ PCI_VDEVICE(ATI,  0x73c4), navi_amd },
 	{ PCI_VDEVICE(ATI,  0x7444), navi_amd },
 	{ PCI_VDEVICE(ATI,  0x7464), navi_amd },
 	{ 0,}
 };
 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);

 static struct pci_driver dw_i2c_driver = {
 	.name		= DRIVER_NAME,
 	.id_table	= i2_designware_pci_ids,
 	.probe		= i2c_dw_pci_probe,
 	.remove		= i2c_dw_pci_remove,
 	.driver         = {
 		.pm     = &i2c_dw_pm_ops,
 	},
 };
 module_pci_driver(dw_i2c_driver);

 /* Work with hotplug and coldplug */
 MODULE_ALIAS("i2c_designware-pci");
 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Synopsys DesignWare I2C adapter driver (master only).
	*
	* Based on the TI DAVINCI I2C adapter driver.
	*
	* Copyright (C) 2006 Texas Instruments.
	* Copyright (C) 2007 MontaVista Software Inc.
	* Copyright (C) 2009 Provigent Ltd.
	* Copyright (C) 2011, 2015, 2016 Intel Corporation.
	*/
	#include <linux/acpi.h>
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/errno.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/pm_runtime.h>
	#include <linux/power_supply.h>
	#include <linux/sched.h>
	#include <linux/slab.h>

	#include "i2c-designware-core.h"
	#include "i2c-ccgx-ucsi.h"

	#define DRIVER_NAME "i2c-designware-pci"

	enum dw_pci_ctl_id_t {
	medfield,
	merrifield,
	baytrail,
	cherrytrail,
	haswell,
	elkhartlake,
	navi_amd,
	};

	/*
	* This is a legacy structure to describe the hardware counters
	* to configure signal timings on the bus. For Device Tree platforms
	* one should use the respective properties and for ACPI there is
	* a set of ACPI methods that provide these counters. No new
	* platform should use this structure.
	*/
	struct dw_scl_sda_cfg {
	u16 ss_hcnt;
	u16 fs_hcnt;
	u16 ss_lcnt;
	u16 fs_lcnt;
	u32 sda_hold;
	};

	struct dw_pci_controller {
	u32 bus_num;
	u32 flags;
	struct dw_scl_sda_cfg *scl_sda_cfg;
	int (setup)(struct pci_dev pdev, struct dw_pci_controller *c);
	u32 (get_clk_rate_khz)(struct dw_i2c_dev dev);
	};

	/* Merrifield HCNT/LCNT/SDA hold time */
	static struct dw_scl_sda_cfg mrfld_config = {
	.ss_hcnt = 0x2f8,
	.fs_hcnt = 0x87,
	.ss_lcnt = 0x37b,
	.fs_lcnt = 0x10a,
	};

	/* BayTrail HCNT/LCNT/SDA hold time */
	static struct dw_scl_sda_cfg byt_config = {
	.ss_hcnt = 0x200,
	.fs_hcnt = 0x55,
	.ss_lcnt = 0x200,
	.fs_lcnt = 0x99,
	.sda_hold = 0x6,
	};

	/* Haswell HCNT/LCNT/SDA hold time */
	static struct dw_scl_sda_cfg hsw_config = {
	.ss_hcnt = 0x01b0,
	.fs_hcnt = 0x48,
	.ss_lcnt = 0x01fb,
	.fs_lcnt = 0xa0,
	.sda_hold = 0x9,
	};

	/* NAVI-AMD HCNT/LCNT/SDA hold time */
	static struct dw_scl_sda_cfg navi_amd_config = {
	.ss_hcnt = 0x1ae,
	.ss_lcnt = 0x23a,
	.sda_hold = 0x9,
	};

	static u32 mfld_get_clk_rate_khz(struct dw_i2c_dev *dev)
	{
	return 25000;
	}

	static int mfld_setup(struct pci_dev pdev, struct dw_pci_controller c)
	{
	struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev);

	switch (pdev->device) {
	case 0x0817:
	dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
	fallthrough;
	case 0x0818:
	case 0x0819:
	c->bus_num = pdev->device - 0x817 + 3;
	return 0;
	case 0x082C:
	case 0x082D:
	case 0x082E:
	c->bus_num = pdev->device - 0x82C + 0;
	return 0;
	}
	return -ENODEV;
	}

	static int mrfld_setup(struct pci_dev pdev, struct dw_pci_controller c)
	{
	/*
	* On Intel Merrifield the user visible i2c buses are enumerated
	* [1..7]. So, we add 1 to shift the default range. Besides that the
	* first PCI slot provides 4 functions, that's why we have to add 0 to
	* the first slot and 4 to the next one.
	*/
	switch (PCI_SLOT(pdev->devfn)) {
	case 8:
	c->bus_num = PCI_FUNC(pdev->devfn) + 0 + 1;
	return 0;
	case 9:
	c->bus_num = PCI_FUNC(pdev->devfn) + 4 + 1;
	return 0;
	}
	return -ENODEV;
	}

	static u32 ehl_get_clk_rate_khz(struct dw_i2c_dev *dev)
	{
	return 100000;
	}

	static u32 navi_amd_get_clk_rate_khz(struct dw_i2c_dev *dev)
	{
	return 100000;
	}

	static int navi_amd_setup(struct pci_dev pdev, struct dw_pci_controller c)
	{
	struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev);

	dev->flags \|= MODEL_AMD_NAVI_GPU \| ACCESS_POLLING;
	dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
	return 0;
	}

	static struct dw_pci_controller dw_pci_controllers[] = {
	[medfield] = {
	.bus_num = -1,
	.setup = mfld_setup,
	.get_clk_rate_khz = mfld_get_clk_rate_khz,
	},
	[merrifield] = {
	.bus_num = -1,
	.scl_sda_cfg = &mrfld_config,
	.setup = mrfld_setup,
	},
	[baytrail] = {
	.bus_num = -1,
	.scl_sda_cfg = &byt_config,
	},
	[haswell] = {
	.bus_num = -1,
	.scl_sda_cfg = &hsw_config,
	},
	[cherrytrail] = {
	.bus_num = -1,
	.scl_sda_cfg = &byt_config,
	},
	[elkhartlake] = {
	.bus_num = -1,
	.get_clk_rate_khz = ehl_get_clk_rate_khz,
	},
	[navi_amd] = {
	.bus_num = -1,
	.scl_sda_cfg = &navi_amd_config,
	.setup = navi_amd_setup,
	.get_clk_rate_khz = navi_amd_get_clk_rate_khz,
	},
	};

	static int __maybe_unused i2c_dw_pci_runtime_suspend(struct device *dev)
	{
	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);

	i_dev->disable(i_dev);
	return 0;
	}

	static int __maybe_unused i2c_dw_pci_suspend(struct device *dev)
	{
	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);

	i2c_mark_adapter_suspended(&i_dev->adapter);

	return i2c_dw_pci_runtime_suspend(dev);
	}

	static int __maybe_unused i2c_dw_pci_runtime_resume(struct device *dev)
	{
	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);

	return i_dev->init(i_dev);
	}

	static int __maybe_unused i2c_dw_pci_resume(struct device *dev)
	{
	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
	int ret;

	ret = i2c_dw_pci_runtime_resume(dev);

	i2c_mark_adapter_resumed(&i_dev->adapter);

	return ret;
	}

	static const struct dev_pm_ops i2c_dw_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume)
	SET_RUNTIME_PM_OPS(i2c_dw_pci_runtime_suspend, i2c_dw_pci_runtime_resume, NULL)
	};

	static const struct property_entry dgpu_properties[] = {
	/* USB-C doesn't power the system */
	PROPERTY_ENTRY_U8("scope", POWER_SUPPLY_SCOPE_DEVICE),
	{}
	};

	static const struct software_node dgpu_node = {
	.properties = dgpu_properties,
	};

	static int i2c_dw_pci_probe(struct pci_dev *pdev,
	const struct pci_device_id *id)
	{
	struct dw_i2c_dev *dev;
	struct i2c_adapter *adap;
	int r;
	struct dw_pci_controller *controller;
	struct dw_scl_sda_cfg *cfg;
	struct i2c_timings *t;

	if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers))
	return dev_err_probe(&pdev->dev, -EINVAL,
	"Invalid driver data %ld\n",
	id->driver_data);

	controller = &dw_pci_controllers[id->driver_data];

	r = pcim_enable_device(pdev);
	if (r)
	return dev_err_probe(&pdev->dev, r,
	"Failed to enable I2C PCI device\n");

	pci_set_master(pdev);

	r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
	if (r)
	return dev_err_probe(&pdev->dev, r,
	"I/O memory remapping failed\n");

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

	r = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
	if (r < 0)
	return r;

	dev->get_clk_rate_khz = controller->get_clk_rate_khz;
	dev->base = pcim_iomap_table(pdev)[0];
	dev->dev = &pdev->dev;
	dev->irq = pci_irq_vector(pdev, 0);
	dev->flags \|= controller->flags;

	t = &dev->timings;
	i2c_parse_fw_timings(&pdev->dev, t, false);

	pci_set_drvdata(pdev, dev);

	if (controller->setup) {
	r = controller->setup(pdev, controller);
	if (r) {
	pci_free_irq_vectors(pdev);
	return r;
	}
	}

	i2c_dw_adjust_bus_speed(dev);

	if (has_acpi_companion(&pdev->dev))
	i2c_dw_acpi_configure(&pdev->dev);

	r = i2c_dw_validate_speed(dev);
	if (r) {
	pci_free_irq_vectors(pdev);
	return r;
	}

	i2c_dw_configure(dev);

	if (controller->scl_sda_cfg) {
	cfg = controller->scl_sda_cfg;
	dev->ss_hcnt = cfg->ss_hcnt;
	dev->fs_hcnt = cfg->fs_hcnt;
	dev->ss_lcnt = cfg->ss_lcnt;
	dev->fs_lcnt = cfg->fs_lcnt;
	dev->sda_hold_time = cfg->sda_hold;
	}

	adap = &dev->adapter;
	adap->owner = THIS_MODULE;
	adap->class = 0;
	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
	adap->nr = controller->bus_num;

	r = i2c_dw_probe(dev);
	if (r) {
	pci_free_irq_vectors(pdev);
	return r;
	}

	if ((dev->flags & MODEL_MASK) == MODEL_AMD_NAVI_GPU) {
	dev->slave = i2c_new_ccgx_ucsi(&dev->adapter, dev->irq, &dgpu_node);
	if (IS_ERR(dev->slave))
	return dev_err_probe(dev->dev, PTR_ERR(dev->slave),
	"register UCSI failed\n");
	}

	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
	pm_runtime_use_autosuspend(&pdev->dev);
	pm_runtime_put_autosuspend(&pdev->dev);
	pm_runtime_allow(&pdev->dev);

	return 0;
	}

	static void i2c_dw_pci_remove(struct pci_dev *pdev)
	{
	struct dw_i2c_dev *dev = pci_get_drvdata(pdev);

	dev->disable(dev);
	pm_runtime_forbid(&pdev->dev);
	pm_runtime_get_noresume(&pdev->dev);

	i2c_del_adapter(&dev->adapter);
	devm_free_irq(&pdev->dev, dev->irq, dev);
	pci_free_irq_vectors(pdev);
	}

	static const struct pci_device_id i2_designware_pci_ids[] = {
	/* Medfield */
	{ PCI_VDEVICE(INTEL, 0x0817), medfield },
	{ PCI_VDEVICE(INTEL, 0x0818), medfield },
	{ PCI_VDEVICE(INTEL, 0x0819), medfield },
	{ PCI_VDEVICE(INTEL, 0x082C), medfield },
	{ PCI_VDEVICE(INTEL, 0x082D), medfield },
	{ PCI_VDEVICE(INTEL, 0x082E), medfield },
	/* Merrifield */
	{ PCI_VDEVICE(INTEL, 0x1195), merrifield },
	{ PCI_VDEVICE(INTEL, 0x1196), merrifield },
	/* Baytrail */
	{ PCI_VDEVICE(INTEL, 0x0F41), baytrail },
	{ PCI_VDEVICE(INTEL, 0x0F42), baytrail },
	{ PCI_VDEVICE(INTEL, 0x0F43), baytrail },
	{ PCI_VDEVICE(INTEL, 0x0F44), baytrail },
	{ PCI_VDEVICE(INTEL, 0x0F45), baytrail },
	{ PCI_VDEVICE(INTEL, 0x0F46), baytrail },
	{ PCI_VDEVICE(INTEL, 0x0F47), baytrail },
	/* Haswell */
	{ PCI_VDEVICE(INTEL, 0x9c61), haswell },
	{ PCI_VDEVICE(INTEL, 0x9c62), haswell },
	/* Braswell / Cherrytrail */
	{ PCI_VDEVICE(INTEL, 0x22C1), cherrytrail },
	{ PCI_VDEVICE(INTEL, 0x22C2), cherrytrail },
	{ PCI_VDEVICE(INTEL, 0x22C3), cherrytrail },
	{ PCI_VDEVICE(INTEL, 0x22C4), cherrytrail },
	{ PCI_VDEVICE(INTEL, 0x22C5), cherrytrail },
	{ PCI_VDEVICE(INTEL, 0x22C6), cherrytrail },
	{ PCI_VDEVICE(INTEL, 0x22C7), cherrytrail },
	/* Elkhart Lake (PSE I2C) */
	{ PCI_VDEVICE(INTEL, 0x4bb9), elkhartlake },
	{ PCI_VDEVICE(INTEL, 0x4bba), elkhartlake },
	{ PCI_VDEVICE(INTEL, 0x4bbb), elkhartlake },
	{ PCI_VDEVICE(INTEL, 0x4bbc), elkhartlake },
	{ PCI_VDEVICE(INTEL, 0x4bbd), elkhartlake },
	{ PCI_VDEVICE(INTEL, 0x4bbe), elkhartlake },
	{ PCI_VDEVICE(INTEL, 0x4bbf), elkhartlake },
	{ PCI_VDEVICE(INTEL, 0x4bc0), elkhartlake },
	/* AMD NAVI */
	{ PCI_VDEVICE(ATI, 0x7314), navi_amd },
	{ PCI_VDEVICE(ATI, 0x73a4), navi_amd },
	{ PCI_VDEVICE(ATI, 0x73e4), navi_amd },
	{ PCI_VDEVICE(ATI, 0x73c4), navi_amd },
	{ PCI_VDEVICE(ATI, 0x7444), navi_amd },
	{ PCI_VDEVICE(ATI, 0x7464), navi_amd },
	{ 0,}
	};
	MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);

	static struct pci_driver dw_i2c_driver = {
	.name = DRIVER_NAME,
	.id_table = i2_designware_pci_ids,
	.probe = i2c_dw_pci_probe,
	.remove = i2c_dw_pci_remove,
	.driver = {
	.pm = &i2c_dw_pm_ops,
	},
	};
	module_pci_driver(dw_i2c_driver);

	/* Work with hotplug and coldplug */
	MODULE_ALIAS("i2c_designware-pci");
	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
	MODULE_LICENSE("GPL");