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Commit 60ae5b9f authored by Raymond Tan's avatar Raymond Tan Committed by Lee Jones
Browse files

mfd: intel_quark_i2c_gpio: Add Intel Quark X1000 I2C-GPIO MFD Driver 



In Quark X1000, there's a single PCI device that provides both
an I2C controller and a GPIO controller. This MFD driver will
split the 2 devices for their respective drivers.

This patch is based on Josef Ahmad's initial work for Quark enabling.

Acked-by: default avatarMichael Turquette <mturquette@linaro.org>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarWeike Chen <alvin.chen@intel.com>
Signed-off-by: default avatarRaymond Tan <raymond.tan@intel.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent e19f7428

drivers/mfd/Kconfig

+12 −0
Original line number Original line Diff line number Diff line
@@ -283,6 +283,18 @@ config HTC_I2CPLD 
	  This device provides input and output GPIOs through an I2C

	  This device provides input and output GPIOs through an I2C

	  interface to one or more sub-chips.

	  interface to one or more sub-chips.





config MFD_INTEL_QUARK_I2C_GPIO

	tristate "Intel Quark MFD I2C GPIO"

	depends on PCI

	depends on X86

	depends on COMMON_CLK

	select MFD_CORE

	help

	  This MFD provides support for I2C and GPIO that exist only

	  in a single PCI device. It splits the 2 IO devices to

	  their respective IO driver.

	  The GPIO exports a total amount of 8 interrupt-capable GPIOs.



config LPC_ICH

config LPC_ICH

	tristate "Intel ICH LPC"

	tristate "Intel ICH LPC"

	depends on PCI

	depends on PCI

drivers/mfd/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -139,6 +139,7 @@ obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-sysctrl.o 
obj-$(CONFIG_MFD_TIMBERDALE)    += timberdale.o

obj-$(CONFIG_MFD_TIMBERDALE)    += timberdale.o

obj-$(CONFIG_PMIC_ADP5520)	+= adp5520.o

obj-$(CONFIG_PMIC_ADP5520)	+= adp5520.o

obj-$(CONFIG_MFD_KEMPLD)	+= kempld-core.o

obj-$(CONFIG_MFD_KEMPLD)	+= kempld-core.o

obj-$(CONFIG_MFD_INTEL_QUARK_I2C_GPIO)	+= intel_quark_i2c_gpio.o

obj-$(CONFIG_LPC_SCH)		+= lpc_sch.o

obj-$(CONFIG_LPC_SCH)		+= lpc_sch.o

obj-$(CONFIG_LPC_ICH)		+= lpc_ich.o

obj-$(CONFIG_LPC_ICH)		+= lpc_ich.o

obj-$(CONFIG_MFD_RDC321X)	+= rdc321x-southbridge.o

obj-$(CONFIG_MFD_RDC321X)	+= rdc321x-southbridge.o

drivers/mfd/intel_quark_i2c_gpio.c

0 → 100644
+277 −0
Original line number Original line Diff line number Diff line 
/*

 * 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



/* 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



#define INTEL_QUARK_I2C_NCLK	1



struct intel_quark_mfd {

	struct pci_dev		*pdev;

	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 resource intel_quark_gpio_res[] = {

	[INTEL_QUARK_IORES_MEM] = {

		.flags = IORESOURCE_MEM,

	},

};



static struct mfd_cell intel_quark_mfd_cells[] = {

	{

		.id = MFD_I2C_BAR,

		.name = "i2c_designware",

		.num_resources = ARRAY_SIZE(intel_quark_i2c_res),

		.resources = intel_quark_i2c_res,

		.ignore_resource_conflicts = true,

	},

	{

		.id = MFD_GPIO_BAR,

		.name = "gpio-dwapb",

		.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 intel_quark_mfd *quark_mfd)

{

	struct pci_dev *pdev = quark_mfd->pdev;

	struct clk_lookup *i2c_clk_lookup;

	struct clk *i2c_clk;

	int ret;



	i2c_clk_lookup = devm_kcalloc(&pdev->dev, INTEL_QUARK_I2C_NCLK,

				      sizeof(*i2c_clk_lookup), GFP_KERNEL);

	if (!i2c_clk_lookup)

		return -ENOMEM;



	i2c_clk_lookup[0].dev_id = INTEL_QUARK_I2C_CONTROLLER_CLK;



	i2c_clk = clk_register_fixed_rate(&pdev->dev,

					  INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,

					  CLK_IS_ROOT, INTEL_QUARK_I2C_CLK_HZ);



	quark_mfd->i2c_clk_lookup = i2c_clk_lookup;

	quark_mfd->i2c_clk = i2c_clk;



	ret = clk_register_clkdevs(i2c_clk, i2c_clk_lookup,

				   INTEL_QUARK_I2C_NCLK);

	if (ret)

		dev_err(&pdev->dev, "Fixed clk register failed: %d\n", ret);



	return ret;

}



static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev)

{

	struct intel_quark_mfd *quark_mfd = dev_get_drvdata(&pdev->dev);



	if (!quark_mfd->i2c_clk || !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);

	struct dw_i2c_platform_data *pdata;

	struct resource *res = (struct resource *)cell->resources;

	struct device *dev = &pdev->dev;

	unsigned int i;



	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;



	/* Fast mode by default */

	pdata->i2c_scl_freq = 400000;



	for (i = 0; i < ARRAY_SIZE(platform_i2c_mode_info); i++)

		if (!strcmp(board_name, platform_i2c_mode_info[i].name))

			pdata->i2c_scl_freq

				= platform_i2c_mode_info[i].i2c_scl_freq;



	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->node		= NULL;

	pdata->properties->name		= "intel-quark-x1000-gpio-portA";

	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->pdev = pdev;



	ret = intel_quark_register_i2c_clk(quark_mfd);

	if (ret)

		return ret;



	dev_set_drvdata(&pdev->dev, quark_mfd);



	ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[MFD_I2C_BAR]);

	if (ret)

		return ret;



	ret = intel_quark_gpio_setup(pdev,

				     &intel_quark_mfd_cells[MFD_GPIO_BAR]);

	if (ret)

		return ret;



	return mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,

			       ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,

			       NULL);

}



static void intel_quark_mfd_remove(struct pci_dev *pdev)

{

	intel_quark_unregister_i2c_clk(pdev);

	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");