drivers/i2c/busses/i2c-designware-pcidrv.c - linux/kernel/git/viro/vfs - Git at Google

 /*
  * 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 Intel corporation.
  *
  * ----------------------------------------------------------------------------
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  * ----------------------------------------------------------------------------
  *
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/pm_runtime.h>
 #include "i2c-designware-core.h"

 #define DRIVER_NAME "i2c-designware-pci"

 enum dw_pci_ctl_id_t {
 	moorestown_0,
 	moorestown_1,
 	moorestown_2,

 	medfield_0,
 	medfield_1,
 	medfield_2,
 	medfield_3,
 	medfield_4,
 	medfield_5,
 };

 struct dw_pci_controller {
 	u32 bus_num;
 	u32 bus_cfg;
 	u32 tx_fifo_depth;
 	u32 rx_fifo_depth;
 	u32 clk_khz;
 };

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

 static struct  dw_pci_controller  dw_pci_controllers[] = {
 	[moorestown_0] = {
 		.bus_num     = 0,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 	[moorestown_1] = {
 		.bus_num     = 1,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 	[moorestown_2] = {
 		.bus_num     = 2,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 	[medfield_0] = {
 		.bus_num     = 0,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 	[medfield_1] = {
 		.bus_num     = 1,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 	[medfield_2] = {
 		.bus_num     = 2,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 	[medfield_3] = {
 		.bus_num     = 3,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 	[medfield_4] = {
 		.bus_num     = 4,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 	[medfield_5] = {
 		.bus_num     = 5,
 		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
 		.clk_khz      = 25000,
 	},
 };
 static struct i2c_algorithm i2c_dw_algo = {
 	.master_xfer	= i2c_dw_xfer,
 	.functionality	= i2c_dw_func,
 };

 static int i2c_dw_pci_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 	struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
 	int err;


 	i2c_dw_disable(i2c);

 	err = pci_save_state(pdev);
 	if (err) {
 		dev_err(&pdev->dev, "pci_save_state failed\n");
 		return err;
 	}

 	err = pci_set_power_state(pdev, PCI_D3hot);
 	if (err) {
 		dev_err(&pdev->dev, "pci_set_power_state failed\n");
 		return err;
 	}

 	return 0;
 }

 static int i2c_dw_pci_resume(struct device *dev)
 {
 	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 	struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
 	int err;
 	u32 enabled;

 	enabled = i2c_dw_is_enabled(i2c);
 	if (enabled)
 		return 0;

 	err = pci_set_power_state(pdev, PCI_D0);
 	if (err) {
 		dev_err(&pdev->dev, "pci_set_power_state() failed\n");
 		return err;
 	}

 	pci_restore_state(pdev);

 	i2c_dw_init(i2c);
 	return 0;
 }

 static int i2c_dw_pci_runtime_idle(struct device *dev)
 {
 	int err = pm_schedule_suspend(dev, 500);
 	dev_dbg(dev, "runtime_idle called\n");

 	if (err != 0)
 		return 0;
 	return -EBUSY;
 }

 static const struct dev_pm_ops i2c_dw_pm_ops = {
 	.resume         = i2c_dw_pci_resume,
 	.suspend        = i2c_dw_pci_suspend,
 	SET_RUNTIME_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume,
 			   i2c_dw_pci_runtime_idle)
 };

 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;

 	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;
 	}

 	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;

 	init_completion(&dev->cmd_complete);
 	mutex_init(&dev->lock);
 	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->functionality =
 		I2C_FUNC_I2C |
 		I2C_FUNC_SMBUS_BYTE |
 		I2C_FUNC_SMBUS_BYTE_DATA |
 		I2C_FUNC_SMBUS_WORD_DATA |
 		I2C_FUNC_SMBUS_I2C_BLOCK;
 	dev->master_cfg =  controller->bus_cfg;

 	pci_set_drvdata(pdev, dev);

 	dev->tx_fifo_depth = controller->tx_fifo_depth;
 	dev->rx_fifo_depth = controller->rx_fifo_depth;
 	r = i2c_dw_init(dev);
 	if (r)
 		return r;

 	adap = &dev->adapter;
 	i2c_set_adapdata(adap, dev);
 	adap->owner = THIS_MODULE;
 	adap->class = 0;
 	adap->algo = &i2c_dw_algo;
 	adap->dev.parent = &pdev->dev;
 	adap->nr = controller->bus_num;
 	snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
 		adap->nr);

 	r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
 			adap->name, dev);
 	if (r) {
 		dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
 		return r;
 	}

 	i2c_dw_disable_int(dev);
 	i2c_dw_clear_int(dev);
 	r = i2c_add_numbered_adapter(adap);
 	if (r) {
 		dev_err(&pdev->dev, "failure adding adapter\n");
 		return r;
 	}

 	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
 	pm_runtime_use_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);

 	i2c_dw_disable(dev);
 	pm_runtime_forbid(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);

 	i2c_del_adapter(&dev->adapter);
 }

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

 static DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
 	/* Moorestown */
 	{ PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
 	{ PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
 	{ PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
 	/* Medfield */
 	{ PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
 	{ PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
 	{ PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
 	{ PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
 	{ PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
 	{ PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
 	{ 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");
	/*
	* 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 Intel corporation.
	*
	* ----------------------------------------------------------------------------
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	* ----------------------------------------------------------------------------
	*
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/i2c.h>
	#include <linux/errno.h>
	#include <linux/sched.h>
	#include <linux/err.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/slab.h>
	#include <linux/pci.h>
	#include <linux/pm_runtime.h>
	#include "i2c-designware-core.h"

	#define DRIVER_NAME "i2c-designware-pci"

	enum dw_pci_ctl_id_t {
	moorestown_0,
	moorestown_1,
	moorestown_2,

	medfield_0,
	medfield_1,
	medfield_2,
	medfield_3,
	medfield_4,
	medfield_5,
	};

	struct dw_pci_controller {
	u32 bus_num;
	u32 bus_cfg;
	u32 tx_fifo_depth;
	u32 rx_fifo_depth;
	u32 clk_khz;
	};

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

	static struct dw_pci_controller dw_pci_controllers[] = {
	[moorestown_0] = {
	.bus_num = 0,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	[moorestown_1] = {
	.bus_num = 1,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	[moorestown_2] = {
	.bus_num = 2,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	[medfield_0] = {
	.bus_num = 0,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	[medfield_1] = {
	.bus_num = 1,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	[medfield_2] = {
	.bus_num = 2,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	[medfield_3] = {
	.bus_num = 3,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_STD,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	[medfield_4] = {
	.bus_num = 4,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	[medfield_5] = {
	.bus_num = 5,
	.bus_cfg = INTEL_MID_STD_CFG \| DW_IC_CON_SPEED_FAST,
	.tx_fifo_depth = 32,
	.rx_fifo_depth = 32,
	.clk_khz = 25000,
	},
	};
	static struct i2c_algorithm i2c_dw_algo = {
	.master_xfer = i2c_dw_xfer,
	.functionality = i2c_dw_func,
	};

	static int i2c_dw_pci_suspend(struct device *dev)
	{
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
	int err;


	i2c_dw_disable(i2c);

	err = pci_save_state(pdev);
	if (err) {
	dev_err(&pdev->dev, "pci_save_state failed\n");
	return err;
	}

	err = pci_set_power_state(pdev, PCI_D3hot);
	if (err) {
	dev_err(&pdev->dev, "pci_set_power_state failed\n");
	return err;
	}

	return 0;
	}

	static int i2c_dw_pci_resume(struct device *dev)
	{
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
	int err;
	u32 enabled;

	enabled = i2c_dw_is_enabled(i2c);
	if (enabled)
	return 0;

	err = pci_set_power_state(pdev, PCI_D0);
	if (err) {
	dev_err(&pdev->dev, "pci_set_power_state() failed\n");
	return err;
	}

	pci_restore_state(pdev);

	i2c_dw_init(i2c);
	return 0;
	}

	static int i2c_dw_pci_runtime_idle(struct device *dev)
	{
	int err = pm_schedule_suspend(dev, 500);
	dev_dbg(dev, "runtime_idle called\n");

	if (err != 0)
	return 0;
	return -EBUSY;
	}

	static const struct dev_pm_ops i2c_dw_pm_ops = {
	.resume = i2c_dw_pci_resume,
	.suspend = i2c_dw_pci_suspend,
	SET_RUNTIME_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume,
	i2c_dw_pci_runtime_idle)
	};

	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;

	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;
	}

	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;

	init_completion(&dev->cmd_complete);
	mutex_init(&dev->lock);
	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->functionality =
	I2C_FUNC_I2C \|
	I2C_FUNC_SMBUS_BYTE \|
	I2C_FUNC_SMBUS_BYTE_DATA \|
	I2C_FUNC_SMBUS_WORD_DATA \|
	I2C_FUNC_SMBUS_I2C_BLOCK;
	dev->master_cfg = controller->bus_cfg;

	pci_set_drvdata(pdev, dev);

	dev->tx_fifo_depth = controller->tx_fifo_depth;
	dev->rx_fifo_depth = controller->rx_fifo_depth;
	r = i2c_dw_init(dev);
	if (r)
	return r;

	adap = &dev->adapter;
	i2c_set_adapdata(adap, dev);
	adap->owner = THIS_MODULE;
	adap->class = 0;
	adap->algo = &i2c_dw_algo;
	adap->dev.parent = &pdev->dev;
	adap->nr = controller->bus_num;
	snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
	adap->nr);

	r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
	adap->name, dev);
	if (r) {
	dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
	return r;
	}

	i2c_dw_disable_int(dev);
	i2c_dw_clear_int(dev);
	r = i2c_add_numbered_adapter(adap);
	if (r) {
	dev_err(&pdev->dev, "failure adding adapter\n");
	return r;
	}

	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
	pm_runtime_use_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);

	i2c_dw_disable(dev);
	pm_runtime_forbid(&pdev->dev);
	pm_runtime_get_noresume(&pdev->dev);

	i2c_del_adapter(&dev->adapter);
	}

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

	static DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
	/* Moorestown */
	{ PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
	{ PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
	{ PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
	/* Medfield */
	{ PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
	{ PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
	{ PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
	{ PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
	{ PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
	{ PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
	{ 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");