drivers/mfd/intel_quark_i2c_gpio.c - kernel/quantenna - Git at Google

 /*
  * Intel Quark MFD PCI driver for I2C & GPIO
  *
  * Copyright(c) 2014 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * 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/platform_data/gpio-dwapb.h>
 #include <linux/platform_data/i2c-designware.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

 /* The base GPIO number under GPIOLIB framework */
 #define INTEL_QUARK_MFD_GPIO_BASE	8

 /* The default number of South-Cluster GPIO on Quark. */
 #define INTEL_QUARK_MFD_NGPIO		8

 /* The DesignWare GPIO ports on Quark. */
 #define INTEL_QUARK_GPIO_NPORTS	1

 #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 device		*dev;
 	struct clk		*i2c_clk;
 	struct clk_lookup	*i2c_clk_lookup;
 };

 struct i2c_mode_info {
 	const char *name;
 	unsigned int i2c_scl_freq;
 };

 static const struct i2c_mode_info platform_i2c_mode_info[] = {
 	{
 		.name = "Galileo",
 		.i2c_scl_freq = 100000,
 	},
 	{
 		.name = "GalileoGen2",
 		.i2c_scl_freq = 400000,
 	},
 	{}
 };

 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,
 };

 static struct resource intel_quark_gpio_res[] = {
 	[INTEL_QUARK_IORES_MEM] = {
 		.flags = IORESOURCE_MEM,
 	},
 };

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

 static struct mfd_cell intel_quark_mfd_cells[] = {
 	{
 		.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,
 	},
 	{
 		.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,
 	},
 };

 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)
 {
 	const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
 	const struct i2c_mode_info *info;
 	struct dw_i2c_platform_data *pdata;
 	struct resource *res = (struct resource *)cell->resources;
 	struct device *dev = &pdev->dev;

 	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 = pdev->irq;
 	res[INTEL_QUARK_IORES_IRQ].end = pdev->irq;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;

 	/* Normal mode by default */
 	pdata->i2c_scl_freq = 100000;

 	if (board_name) {
 		for (info = platform_i2c_mode_info; info->name; info++) {
 			if (!strcmp(board_name, info->name)) {
 				pdata->i2c_scl_freq = info->i2c_scl_freq;
 				break;
 			}
 		}
 	}

 	cell->platform_data = pdata;
 	cell->pdata_size = sizeof(*pdata);

 	return 0;
 }

 static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell)
 {
 	struct dwapb_platform_data *pdata;
 	struct resource *res = (struct resource *)cell->resources;
 	struct device *dev = &pdev->dev;

 	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);

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;

 	/* For intel quark x1000, it has only one port: portA */
 	pdata->nports = INTEL_QUARK_GPIO_NPORTS;
 	pdata->properties = devm_kcalloc(dev, pdata->nports,
 					 sizeof(*pdata->properties),
 					 GFP_KERNEL);
 	if (!pdata->properties)
 		return -ENOMEM;

 	/* Set the properties for portA */
 	pdata->properties->fwnode	= NULL;
 	pdata->properties->idx		= 0;
 	pdata->properties->ngpio	= INTEL_QUARK_MFD_NGPIO;
 	pdata->properties->gpio_base	= INTEL_QUARK_MFD_GPIO_BASE;
 	pdata->properties->irq		= pdev->irq;
 	pdata->properties->irq_shared	= true;

 	cell->platform_data = pdata;
 	cell->pdata_size = sizeof(*pdata);

 	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;

 	quark_mfd->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, quark_mfd);

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

 	ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]);
 	if (ret)
 		goto err_unregister_i2c_clk;

 	ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]);
 	if (ret)
 		goto err_unregister_i2c_clk;

 	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_i2c_clk;

 	return 0;

 err_unregister_i2c_clk:
 	intel_quark_unregister_i2c_clk(&pdev->dev);
 	return ret;
 }

 static void intel_quark_mfd_remove(struct pci_dev *pdev)
 {
 	intel_quark_unregister_i2c_clk(&pdev->dev);
 	mfd_remove_devices(&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");
	/*
	* Intel Quark MFD PCI driver for I2C & GPIO
	*
	* Copyright(c) 2014 Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* 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/platform_data/gpio-dwapb.h>
	#include <linux/platform_data/i2c-designware.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

	/* The base GPIO number under GPIOLIB framework */
	#define INTEL_QUARK_MFD_GPIO_BASE 8

	/* The default number of South-Cluster GPIO on Quark. */
	#define INTEL_QUARK_MFD_NGPIO 8

	/* The DesignWare GPIO ports on Quark. */
	#define INTEL_QUARK_GPIO_NPORTS 1

	#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 device *dev;
	struct clk *i2c_clk;
	struct clk_lookup *i2c_clk_lookup;
	};

	struct i2c_mode_info {
	const char *name;
	unsigned int i2c_scl_freq;
	};

	static const struct i2c_mode_info platform_i2c_mode_info[] = {
	{
	.name = "Galileo",
	.i2c_scl_freq = 100000,
	},
	{
	.name = "GalileoGen2",
	.i2c_scl_freq = 400000,
	},
	{}
	};

	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,
	};

	static struct resource intel_quark_gpio_res[] = {
	[INTEL_QUARK_IORES_MEM] = {
	.flags = IORESOURCE_MEM,
	},
	};

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

	static struct mfd_cell intel_quark_mfd_cells[] = {
	{
	.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,
	},
	{
	.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,
	},
	};

	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)
	{
	const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
	const struct i2c_mode_info *info;
	struct dw_i2c_platform_data *pdata;
	struct resource res = (struct resource )cell->resources;
	struct device *dev = &pdev->dev;

	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 = pdev->irq;
	res[INTEL_QUARK_IORES_IRQ].end = pdev->irq;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	/* Normal mode by default */
	pdata->i2c_scl_freq = 100000;

	if (board_name) {
	for (info = platform_i2c_mode_info; info->name; info++) {
	if (!strcmp(board_name, info->name)) {
	pdata->i2c_scl_freq = info->i2c_scl_freq;
	break;
	}
	}
	}

	cell->platform_data = pdata;
	cell->pdata_size = sizeof(*pdata);

	return 0;
	}

	static int intel_quark_gpio_setup(struct pci_dev pdev, struct mfd_cell cell)
	{
	struct dwapb_platform_data *pdata;
	struct resource res = (struct resource )cell->resources;
	struct device *dev = &pdev->dev;

	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);

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	/* For intel quark x1000, it has only one port: portA */
	pdata->nports = INTEL_QUARK_GPIO_NPORTS;
	pdata->properties = devm_kcalloc(dev, pdata->nports,
	sizeof(*pdata->properties),
	GFP_KERNEL);
	if (!pdata->properties)
	return -ENOMEM;

	/* Set the properties for portA */
	pdata->properties->fwnode = NULL;
	pdata->properties->idx = 0;
	pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO;
	pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE;
	pdata->properties->irq = pdev->irq;
	pdata->properties->irq_shared = true;

	cell->platform_data = pdata;
	cell->pdata_size = sizeof(*pdata);

	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;

	quark_mfd->dev = &pdev->dev;
	dev_set_drvdata(&pdev->dev, quark_mfd);

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

	ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]);
	if (ret)
	goto err_unregister_i2c_clk;

	ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]);
	if (ret)
	goto err_unregister_i2c_clk;

	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_i2c_clk;

	return 0;

	err_unregister_i2c_clk:
	intel_quark_unregister_i2c_clk(&pdev->dev);
	return ret;
	}

	static void intel_quark_mfd_remove(struct pci_dev *pdev)
	{
	intel_quark_unregister_i2c_clk(&pdev->dev);
	mfd_remove_devices(&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");