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/sched.h>
 #include <linux/slab.h>

 #include "i2c-designware-core.h"

 #define DRIVER_NAME "i2c-designware-pci"

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

 struct dw_scl_sda_cfg {
 	u32 ss_hcnt;
 	u32 fs_hcnt;
 	u32 ss_lcnt;
 	u32 fs_lcnt;
 	u32 sda_hold;
 };

 struct dw_pci_controller {
 	u32 bus_num;
 	u32 bus_cfg;
 	u32 tx_fifo_depth;
 	u32 rx_fifo_depth;
 	u32 clk_khz;
 	u32 functionality;
 	u32 flags;
 	struct dw_scl_sda_cfg *scl_sda_cfg;
 	int (*setup)(struct pci_dev *pdev, struct dw_pci_controller *c);
 };

 #define INTEL_MID_STD_CFG  (DW_IC_CON_MASTER |			\
 				DW_IC_CON_SLAVE_DISABLE |	\
 				DW_IC_CON_RESTART_EN)

 /* 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,
 };

 static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
 {
 	switch (pdev->device) {
 	case 0x0817:
 		c->bus_cfg &= ~DW_IC_CON_SPEED_MASK;
 		c->bus_cfg |= DW_IC_CON_SPEED_STD;
 		/* fall through */
 	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 struct dw_pci_controller dw_pci_controllers[] = {
 	[medfield] = {
 		.bus_num = -1,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.functionality = I2C_FUNC_10BIT_ADDR,
 		.clk_khz      = 25000,
 		.setup = mfld_setup,
 	},
 	[merrifield] = {
 		.bus_num = -1,
 		.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 64,
 		.rx_fifo_depth = 64,
 		.functionality = I2C_FUNC_10BIT_ADDR,
 		.scl_sda_cfg = &mrfld_config,
 		.setup = mrfld_setup,
 	},
 	[baytrail] = {
 		.bus_num = -1,
 		.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.functionality = I2C_FUNC_10BIT_ADDR,
 		.scl_sda_cfg = &byt_config,
 	},
 	[haswell] = {
 		.bus_num = -1,
 		.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.functionality = I2C_FUNC_10BIT_ADDR,
 		.scl_sda_cfg = &hsw_config,
 	},
 	[cherrytrail] = {
 		.bus_num = -1,
 		.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.functionality = I2C_FUNC_10BIT_ADDR,
 		.flags = MODEL_CHERRYTRAIL,
 		.scl_sda_cfg = &byt_config,
 	},
 	[elkhartlake] = {
 		.bus_num = -1,
 		.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.functionality = I2C_FUNC_10BIT_ADDR,
 		.clk_khz = 100000,
 	},
 };

 #ifdef CONFIG_PM
 static int i2c_dw_pci_suspend(struct device *dev)
 {
 	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);

 	i_dev->suspended = true;
 	i_dev->disable(i_dev);

 	return 0;
 }

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

 	ret = i_dev->init(i_dev);
 	i_dev->suspended = false;

 	return ret;
 }
 #endif

 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
 			    i2c_dw_pci_resume, NULL);

 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
 {
 	return dev->controller->clk_khz;
 }

 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;

 	if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
 		dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
 			id->driver_data);
 		return -EINVAL;
 	}

 	controller = &dw_pci_controllers[id->driver_data];

 	r = pcim_enable_device(pdev);
 	if (r) {
 		dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
 			r);
 		return r;
 	}

 	pci_set_master(pdev);

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

 	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_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->clk = NULL;
 	dev->controller = controller;
 	dev->get_clk_rate_khz = i2c_dw_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;

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

 	dev->functionality = controller->functionality |
 				DW_IC_DEFAULT_FUNCTIONALITY;

 	dev->master_cfg = controller->bus_cfg;
 	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;
 	}

 	pci_set_drvdata(pdev, dev);

 	dev->tx_fifo_depth = controller->tx_fifo_depth;
 	dev->rx_fifo_depth = controller->rx_fifo_depth;

 	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;
 	}

 	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);
 }

 /* work with hotplug and coldplug */
 MODULE_ALIAS("i2c_designware-pci");

 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 },
 	{ 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);

 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/sched.h>
	#include <linux/slab.h>

	#include "i2c-designware-core.h"

	#define DRIVER_NAME "i2c-designware-pci"

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

	struct dw_scl_sda_cfg {
	u32 ss_hcnt;
	u32 fs_hcnt;
	u32 ss_lcnt;
	u32 fs_lcnt;
	u32 sda_hold;
	};

	struct dw_pci_controller {
	u32 bus_num;
	u32 bus_cfg;
	u32 tx_fifo_depth;
	u32 rx_fifo_depth;
	u32 clk_khz;
	u32 functionality;
	u32 flags;
	struct dw_scl_sda_cfg *scl_sda_cfg;
	int (setup)(struct pci_dev pdev, struct dw_pci_controller *c);
	};

	#define INTEL_MID_STD_CFG (DW_IC_CON_MASTER \| \
	DW_IC_CON_SLAVE_DISABLE \| \
	DW_IC_CON_RESTART_EN)

	/* 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,
	};

	static int mfld_setup(struct pci_dev pdev, struct dw_pci_controller c)
	{
	switch (pdev->device) {
	case 0x0817:
	c->bus_cfg &= ~DW_IC_CON_SPEED_MASK;
	c->bus_cfg \|= DW_IC_CON_SPEED_STD;
	/* fall through */
	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 struct dw_pci_controller dw_pci_controllers[] = {
	[medfield] = {
	.bus_num = -1,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.functionality = I2C_FUNC_10BIT_ADDR,
	.clk_khz = 25000,
	.setup = mfld_setup,
	},
	[merrifield] = {
	.bus_num = -1,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 64,
	.rx_fifo_depth = 64,
	.functionality = I2C_FUNC_10BIT_ADDR,
	.scl_sda_cfg = &mrfld_config,
	.setup = mrfld_setup,
	},
	[baytrail] = {
	.bus_num = -1,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.functionality = I2C_FUNC_10BIT_ADDR,
	.scl_sda_cfg = &byt_config,
	},
	[haswell] = {
	.bus_num = -1,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.functionality = I2C_FUNC_10BIT_ADDR,
	.scl_sda_cfg = &hsw_config,
	},
	[cherrytrail] = {
	.bus_num = -1,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.functionality = I2C_FUNC_10BIT_ADDR,
	.flags = MODEL_CHERRYTRAIL,
	.scl_sda_cfg = &byt_config,
	},
	[elkhartlake] = {
	.bus_num = -1,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.functionality = I2C_FUNC_10BIT_ADDR,
	.clk_khz = 100000,
	},
	};

	#ifdef CONFIG_PM
	static int i2c_dw_pci_suspend(struct device *dev)
	{
	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);

	i_dev->suspended = true;
	i_dev->disable(i_dev);

	return 0;
	}

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

	ret = i_dev->init(i_dev);
	i_dev->suspended = false;

	return ret;
	}
	#endif

	static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
	i2c_dw_pci_resume, NULL);

	static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
	{
	return dev->controller->clk_khz;
	}

	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;

	if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
	dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
	id->driver_data);
	return -EINVAL;
	}

	controller = &dw_pci_controllers[id->driver_data];

	r = pcim_enable_device(pdev);
	if (r) {
	dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
	r);
	return r;
	}

	pci_set_master(pdev);

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

	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_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->clk = NULL;
	dev->controller = controller;
	dev->get_clk_rate_khz = i2c_dw_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;

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

	dev->functionality = controller->functionality \|
	DW_IC_DEFAULT_FUNCTIONALITY;

	dev->master_cfg = controller->bus_cfg;
	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;
	}

	pci_set_drvdata(pdev, dev);

	dev->tx_fifo_depth = controller->tx_fifo_depth;
	dev->rx_fifo_depth = controller->rx_fifo_depth;

	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;
	}

	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);
	}

	/* work with hotplug and coldplug */
	MODULE_ALIAS("i2c_designware-pci");

	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 },
	{ 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);

	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
	MODULE_LICENSE("GPL");