drivers/mfd/intel_quark_i2c_gpio.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Intel Quark MFD PCI driver for I2C & GPIO
  *
  * Copyright(c) 2014 Intel Corporation.
  *
  * Intel Quark PCI device for I2C and GPIO controller sharing the same
  * PCI function. This PCI driver will split the 2 devices into their
  * respective drivers.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/mfd/core.h>
 #include <linux/clkdev.h>
 #include <linux/clk-provider.h>
 #include <linux/dmi.h>
 #include <linux/i2c.h>
 #include <linux/property.h>

 /* PCI BAR for register base address */
 #define MFD_I2C_BAR		0
 #define MFD_GPIO_BAR		1

 /* ACPI _ADR value to match the child node */
 #define MFD_ACPI_MATCH_GPIO	0ULL
 #define MFD_ACPI_MATCH_I2C	1ULL

 #define INTEL_QUARK_IORES_MEM	0
 #define INTEL_QUARK_IORES_IRQ	1

 #define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"

 /* The Quark I2C controller source clock */
 #define INTEL_QUARK_I2C_CLK_HZ	33000000

 struct intel_quark_mfd {
 	struct clk		*i2c_clk;
 	struct clk_lookup	*i2c_clk_lookup;
 };

 static const struct property_entry intel_quark_i2c_controller_standard_properties[] = {
 	PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_STANDARD_MODE_FREQ),
 	{ }
 };

 static const struct software_node intel_quark_i2c_controller_standard_node = {
 	.name = "intel-quark-i2c-controller",
 	.properties = intel_quark_i2c_controller_standard_properties,
 };

 static const struct property_entry intel_quark_i2c_controller_fast_properties[] = {
 	PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_FAST_MODE_FREQ),
 	{ }
 };

 static const struct software_node intel_quark_i2c_controller_fast_node = {
 	.name = "intel-quark-i2c-controller",
 	.properties = intel_quark_i2c_controller_fast_properties,
 };

 static const struct dmi_system_id dmi_platform_info[] = {
 	{
 		.matches = {
 			DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
 		},
 		.driver_data = (void *)&intel_quark_i2c_controller_standard_node,
 	},
 	{
 		.matches = {
 			DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
 		},
 		.driver_data = (void *)&intel_quark_i2c_controller_fast_node,
 	},
 	{
 		.matches = {
 			DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
 		},
 		.driver_data = (void *)&intel_quark_i2c_controller_fast_node,
 	},
 	{}
 };

 /* This is used as a place holder and will be modified at run-time */
 static struct resource intel_quark_i2c_res[] = {
 	[INTEL_QUARK_IORES_MEM] = {
 		.flags = IORESOURCE_MEM,
 	},
 	[INTEL_QUARK_IORES_IRQ] = {
 		.flags = IORESOURCE_IRQ,
 	},
 };

 static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
 	.adr = MFD_ACPI_MATCH_I2C,
 };

 /* This is used as a place holder and will be modified at run-time */
 static struct resource intel_quark_gpio_res[] = {
 	[INTEL_QUARK_IORES_MEM] = {
 		.flags = IORESOURCE_MEM,
 	},
 	[INTEL_QUARK_IORES_IRQ] = {
 		.flags = IORESOURCE_IRQ,
 	},
 };

 static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
 	.adr = MFD_ACPI_MATCH_GPIO,
 };

 static const struct software_node intel_quark_gpio_controller_node = {
 	.name = "intel-quark-gpio-controller",
 };

 static const struct property_entry intel_quark_gpio_portA_properties[] = {
 	PROPERTY_ENTRY_U32("reg", 0),
 	PROPERTY_ENTRY_U32("snps,nr-gpios", 8),
 	PROPERTY_ENTRY_U32("gpio-base", 8),
 	{ }
 };

 static const struct software_node intel_quark_gpio_portA_node = {
 	.name = "portA",
 	.parent = &intel_quark_gpio_controller_node,
 	.properties = intel_quark_gpio_portA_properties,
 };

 static const struct software_node *intel_quark_gpio_node_group[] = {
 	&intel_quark_gpio_controller_node,
 	&intel_quark_gpio_portA_node,
 	NULL
 };

 static struct mfd_cell intel_quark_mfd_cells[] = {
 	[MFD_I2C_BAR] = {
 		.id = MFD_I2C_BAR,
 		.name = "i2c_designware",
 		.acpi_match = &intel_quark_acpi_match_i2c,
 		.num_resources = ARRAY_SIZE(intel_quark_i2c_res),
 		.resources = intel_quark_i2c_res,
 		.ignore_resource_conflicts = true,
 	},
 	[MFD_GPIO_BAR] = {
 		.id = MFD_GPIO_BAR,
 		.name = "gpio-dwapb",
 		.acpi_match = &intel_quark_acpi_match_gpio,
 		.num_resources = ARRAY_SIZE(intel_quark_gpio_res),
 		.resources = intel_quark_gpio_res,
 		.ignore_resource_conflicts = true,
 	},
 };

 static const struct pci_device_id intel_quark_mfd_ids[] = {
 	{ PCI_VDEVICE(INTEL, 0x0934), },
 	{},
 };
 MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);

 static int intel_quark_register_i2c_clk(struct device *dev)
 {
 	struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);
 	struct clk *i2c_clk;

 	i2c_clk = clk_register_fixed_rate(dev,
 					  INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
 					  0, INTEL_QUARK_I2C_CLK_HZ);
 	if (IS_ERR(i2c_clk))
 		return PTR_ERR(i2c_clk);

 	quark_mfd->i2c_clk = i2c_clk;
 	quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL,
 						INTEL_QUARK_I2C_CONTROLLER_CLK);

 	if (!quark_mfd->i2c_clk_lookup) {
 		clk_unregister(quark_mfd->i2c_clk);
 		dev_err(dev, "Fixed clk register failed\n");
 		return -ENOMEM;
 	}

 	return 0;
 }

 static void intel_quark_unregister_i2c_clk(struct device *dev)
 {
 	struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);

 	if (!quark_mfd->i2c_clk_lookup)
 		return;

 	clkdev_drop(quark_mfd->i2c_clk_lookup);
 	clk_unregister(quark_mfd->i2c_clk);
 }

 static int intel_quark_i2c_setup(struct pci_dev *pdev)
 {
 	struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_I2C_BAR];
 	struct resource *res = intel_quark_i2c_res;
 	const struct dmi_system_id *dmi_id;

 	res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_I2C_BAR);
 	res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_I2C_BAR);

 	res[INTEL_QUARK_IORES_IRQ].start = pci_irq_vector(pdev, 0);
 	res[INTEL_QUARK_IORES_IRQ].end = pci_irq_vector(pdev, 0);

 	/* Normal mode by default */
 	cell->swnode = &intel_quark_i2c_controller_standard_node;

 	dmi_id = dmi_first_match(dmi_platform_info);
 	if (dmi_id)
 		cell->swnode = (struct software_node *)dmi_id->driver_data;

 	return 0;
 }

 static int intel_quark_gpio_setup(struct pci_dev *pdev)
 {
 	struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_GPIO_BAR];
 	struct resource *res = intel_quark_gpio_res;
 	int ret;

 	res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_GPIO_BAR);
 	res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_GPIO_BAR);

 	res[INTEL_QUARK_IORES_IRQ].start = pci_irq_vector(pdev, 0);
 	res[INTEL_QUARK_IORES_IRQ].end = pci_irq_vector(pdev, 0);

 	ret = software_node_register_node_group(intel_quark_gpio_node_group);
 	if (ret)
 		return ret;

 	cell->swnode = &intel_quark_gpio_controller_node;
 	return 0;
 }

 static int intel_quark_mfd_probe(struct pci_dev *pdev,
 				 const struct pci_device_id *id)
 {
 	struct intel_quark_mfd *quark_mfd;
 	int ret;

 	ret = pcim_enable_device(pdev);
 	if (ret)
 		return ret;

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

 	dev_set_drvdata(&pdev->dev, quark_mfd);

 	ret = intel_quark_register_i2c_clk(&pdev->dev);
 	if (ret)
 		return ret;

 	pci_set_master(pdev);

 	/* This driver only requires 1 IRQ vector */
 	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
 	if (ret < 0)
 		goto err_unregister_i2c_clk;

 	ret = intel_quark_i2c_setup(pdev);
 	if (ret)
 		goto err_free_irq_vectors;

 	ret = intel_quark_gpio_setup(pdev);
 	if (ret)
 		goto err_free_irq_vectors;

 	ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
 			      ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
 			      NULL);
 	if (ret)
 		goto err_unregister_gpio_node_group;

 	return 0;

 err_unregister_gpio_node_group:
 	software_node_unregister_node_group(intel_quark_gpio_node_group);
 err_free_irq_vectors:
 	pci_free_irq_vectors(pdev);
 err_unregister_i2c_clk:
 	intel_quark_unregister_i2c_clk(&pdev->dev);
 	return ret;
 }

 static void intel_quark_mfd_remove(struct pci_dev *pdev)
 {
 	mfd_remove_devices(&pdev->dev);
 	software_node_unregister_node_group(intel_quark_gpio_node_group);
 	pci_free_irq_vectors(pdev);
 	intel_quark_unregister_i2c_clk(&pdev->dev);
 }

 static struct pci_driver intel_quark_mfd_driver = {
 	.name		= "intel_quark_mfd_i2c_gpio",
 	.id_table	= intel_quark_mfd_ids,
 	.probe		= intel_quark_mfd_probe,
 	.remove		= intel_quark_mfd_remove,
 };

 module_pci_driver(intel_quark_mfd_driver);

 MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
 MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Intel Quark MFD PCI driver for I2C & GPIO
	*
	* Copyright(c) 2014 Intel Corporation.
	*
	* Intel Quark PCI device for I2C and GPIO controller sharing the same
	* PCI function. This PCI driver will split the 2 devices into their
	* respective drivers.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/mfd/core.h>
	#include <linux/clkdev.h>
	#include <linux/clk-provider.h>
	#include <linux/dmi.h>
	#include <linux/i2c.h>
	#include <linux/property.h>

	/* PCI BAR for register base address */
	#define MFD_I2C_BAR 0
	#define MFD_GPIO_BAR 1

	/* ACPI _ADR value to match the child node */
	#define MFD_ACPI_MATCH_GPIO 0ULL
	#define MFD_ACPI_MATCH_I2C 1ULL

	#define INTEL_QUARK_IORES_MEM 0
	#define INTEL_QUARK_IORES_IRQ 1

	#define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"

	/* The Quark I2C controller source clock */
	#define INTEL_QUARK_I2C_CLK_HZ 33000000

	struct intel_quark_mfd {
	struct clk *i2c_clk;
	struct clk_lookup *i2c_clk_lookup;
	};

	static const struct property_entry intel_quark_i2c_controller_standard_properties[] = {
	PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_STANDARD_MODE_FREQ),
	{ }
	};

	static const struct software_node intel_quark_i2c_controller_standard_node = {
	.name = "intel-quark-i2c-controller",
	.properties = intel_quark_i2c_controller_standard_properties,
	};

	static const struct property_entry intel_quark_i2c_controller_fast_properties[] = {
	PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_FAST_MODE_FREQ),
	{ }
	};

	static const struct software_node intel_quark_i2c_controller_fast_node = {
	.name = "intel-quark-i2c-controller",
	.properties = intel_quark_i2c_controller_fast_properties,
	};

	static const struct dmi_system_id dmi_platform_info[] = {
	{
	.matches = {
	DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
	},
	.driver_data = (void *)&intel_quark_i2c_controller_standard_node,
	},
	{
	.matches = {
	DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
	},
	.driver_data = (void *)&intel_quark_i2c_controller_fast_node,
	},
	{
	.matches = {
	DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
	},
	.driver_data = (void *)&intel_quark_i2c_controller_fast_node,
	},
	{}
	};

	/* This is used as a place holder and will be modified at run-time */
	static struct resource intel_quark_i2c_res[] = {
	[INTEL_QUARK_IORES_MEM] = {
	.flags = IORESOURCE_MEM,
	},
	[INTEL_QUARK_IORES_IRQ] = {
	.flags = IORESOURCE_IRQ,
	},
	};

	static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
	.adr = MFD_ACPI_MATCH_I2C,
	};

	/* This is used as a place holder and will be modified at run-time */
	static struct resource intel_quark_gpio_res[] = {
	[INTEL_QUARK_IORES_MEM] = {
	.flags = IORESOURCE_MEM,
	},
	[INTEL_QUARK_IORES_IRQ] = {
	.flags = IORESOURCE_IRQ,
	},
	};

	static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
	.adr = MFD_ACPI_MATCH_GPIO,
	};

	static const struct software_node intel_quark_gpio_controller_node = {
	.name = "intel-quark-gpio-controller",
	};

	static const struct property_entry intel_quark_gpio_portA_properties[] = {
	PROPERTY_ENTRY_U32("reg", 0),
	PROPERTY_ENTRY_U32("snps,nr-gpios", 8),
	PROPERTY_ENTRY_U32("gpio-base", 8),
	{ }
	};

	static const struct software_node intel_quark_gpio_portA_node = {
	.name = "portA",
	.parent = &intel_quark_gpio_controller_node,
	.properties = intel_quark_gpio_portA_properties,
	};

	static const struct software_node *intel_quark_gpio_node_group[] = {
	&intel_quark_gpio_controller_node,
	&intel_quark_gpio_portA_node,
	NULL
	};

	static struct mfd_cell intel_quark_mfd_cells[] = {
	[MFD_I2C_BAR] = {
	.id = MFD_I2C_BAR,
	.name = "i2c_designware",
	.acpi_match = &intel_quark_acpi_match_i2c,
	.num_resources = ARRAY_SIZE(intel_quark_i2c_res),
	.resources = intel_quark_i2c_res,
	.ignore_resource_conflicts = true,
	},
	[MFD_GPIO_BAR] = {
	.id = MFD_GPIO_BAR,
	.name = "gpio-dwapb",
	.acpi_match = &intel_quark_acpi_match_gpio,
	.num_resources = ARRAY_SIZE(intel_quark_gpio_res),
	.resources = intel_quark_gpio_res,
	.ignore_resource_conflicts = true,
	},
	};

	static const struct pci_device_id intel_quark_mfd_ids[] = {
	{ PCI_VDEVICE(INTEL, 0x0934), },
	{},
	};
	MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);

	static int intel_quark_register_i2c_clk(struct device *dev)
	{
	struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);
	struct clk *i2c_clk;

	i2c_clk = clk_register_fixed_rate(dev,
	INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
	0, INTEL_QUARK_I2C_CLK_HZ);
	if (IS_ERR(i2c_clk))
	return PTR_ERR(i2c_clk);

	quark_mfd->i2c_clk = i2c_clk;
	quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL,
	INTEL_QUARK_I2C_CONTROLLER_CLK);

	if (!quark_mfd->i2c_clk_lookup) {
	clk_unregister(quark_mfd->i2c_clk);
	dev_err(dev, "Fixed clk register failed\n");
	return -ENOMEM;
	}

	return 0;
	}

	static void intel_quark_unregister_i2c_clk(struct device *dev)
	{
	struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);

	if (!quark_mfd->i2c_clk_lookup)
	return;

	clkdev_drop(quark_mfd->i2c_clk_lookup);
	clk_unregister(quark_mfd->i2c_clk);
	}

	static int intel_quark_i2c_setup(struct pci_dev *pdev)
	{
	struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_I2C_BAR];
	struct resource *res = intel_quark_i2c_res;
	const struct dmi_system_id *dmi_id;

	res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_I2C_BAR);
	res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_I2C_BAR);

	res[INTEL_QUARK_IORES_IRQ].start = pci_irq_vector(pdev, 0);
	res[INTEL_QUARK_IORES_IRQ].end = pci_irq_vector(pdev, 0);

	/* Normal mode by default */
	cell->swnode = &intel_quark_i2c_controller_standard_node;

	dmi_id = dmi_first_match(dmi_platform_info);
	if (dmi_id)
	cell->swnode = (struct software_node *)dmi_id->driver_data;

	return 0;
	}

	static int intel_quark_gpio_setup(struct pci_dev *pdev)
	{
	struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_GPIO_BAR];
	struct resource *res = intel_quark_gpio_res;
	int ret;

	res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_GPIO_BAR);
	res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_GPIO_BAR);

	res[INTEL_QUARK_IORES_IRQ].start = pci_irq_vector(pdev, 0);
	res[INTEL_QUARK_IORES_IRQ].end = pci_irq_vector(pdev, 0);

	ret = software_node_register_node_group(intel_quark_gpio_node_group);
	if (ret)
	return ret;

	cell->swnode = &intel_quark_gpio_controller_node;
	return 0;
	}

	static int intel_quark_mfd_probe(struct pci_dev *pdev,
	const struct pci_device_id *id)
	{
	struct intel_quark_mfd *quark_mfd;
	int ret;

	ret = pcim_enable_device(pdev);
	if (ret)
	return ret;

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

	dev_set_drvdata(&pdev->dev, quark_mfd);

	ret = intel_quark_register_i2c_clk(&pdev->dev);
	if (ret)
	return ret;

	pci_set_master(pdev);

	/* This driver only requires 1 IRQ vector */
	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
	if (ret < 0)
	goto err_unregister_i2c_clk;

	ret = intel_quark_i2c_setup(pdev);
	if (ret)
	goto err_free_irq_vectors;

	ret = intel_quark_gpio_setup(pdev);
	if (ret)
	goto err_free_irq_vectors;

	ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
	ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
	NULL);
	if (ret)
	goto err_unregister_gpio_node_group;

	return 0;

	err_unregister_gpio_node_group:
	software_node_unregister_node_group(intel_quark_gpio_node_group);
	err_free_irq_vectors:
	pci_free_irq_vectors(pdev);
	err_unregister_i2c_clk:
	intel_quark_unregister_i2c_clk(&pdev->dev);
	return ret;
	}

	static void intel_quark_mfd_remove(struct pci_dev *pdev)
	{
	mfd_remove_devices(&pdev->dev);
	software_node_unregister_node_group(intel_quark_gpio_node_group);
	pci_free_irq_vectors(pdev);
	intel_quark_unregister_i2c_clk(&pdev->dev);
	}

	static struct pci_driver intel_quark_mfd_driver = {
	.name = "intel_quark_mfd_i2c_gpio",
	.id_table = intel_quark_mfd_ids,
	.probe = intel_quark_mfd_probe,
	.remove = intel_quark_mfd_remove,
	};

	module_pci_driver(intel_quark_mfd_driver);

	MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
	MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
	MODULE_LICENSE("GPL v2");