[deliverable/linux.git] / drivers / i2c / busses / i2c-designware-platdrv.c

/*
 * 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.
 *
 * ----------------------------------------------------------------------------
 *
 * 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/clk.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/of_i2c.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/io.h>
#include <linux/slab.h>
#include "i2c-designware-core.h"

static struct i2c_algorithm i2c_dw_algo = {
	.master_xfer	= i2c_dw_xfer,
	.functionality	= i2c_dw_func,
};
static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
{
	return clk_get_rate(dev->clk)/1000;
}

static int __devinit dw_i2c_probe(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev;
	struct i2c_adapter *adap;
	struct resource *mem, *ioarea;
	int irq, r;

	/* NOTE: driver uses the static register mapping */
	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "no mem resource?\n");
		return -EINVAL;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "no irq resource?\n");
		return irq; /* -ENXIO */
	}

	ioarea = request_mem_region(mem->start, resource_size(mem),
			pdev->name);
	if (!ioarea) {
		dev_err(&pdev->dev, "I2C region already claimed\n");
		return -EBUSY;
	}

	dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
	if (!dev) {
		r = -ENOMEM;
		goto err_release_region;
	}

	init_completion(&dev->cmd_complete);
	mutex_init(&dev->lock);
	dev->dev = get_device(&pdev->dev);
	dev->irq = irq;
	platform_set_drvdata(pdev, dev);

	dev->clk = clk_get(&pdev->dev, NULL);
	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;

	if (IS_ERR(dev->clk)) {
		r = -ENODEV;
		goto err_free_mem;
	}
	clk_enable(dev->clk);

	dev->functionality =
		I2C_FUNC_I2C |
		I2C_FUNC_10BIT_ADDR |
		I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA |
		I2C_FUNC_SMBUS_WORD_DATA |
		I2C_FUNC_SMBUS_I2C_BLOCK;
	dev->master_cfg =  DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
		DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;

	dev->base = ioremap(mem->start, resource_size(mem));
	if (dev->base == NULL) {
		dev_err(&pdev->dev, "failure mapping io resources\n");
		r = -EBUSY;
		goto err_unuse_clocks;
	}
	{
		u32 param1 = i2c_dw_read_comp_param(dev);

		dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
		dev->rx_fifo_depth = ((param1 >> 8)  & 0xff) + 1;
	}
	r = i2c_dw_init(dev);
	if (r)
		goto err_iounmap;

	i2c_dw_disable_int(dev);
	r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev);
	if (r) {
		dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
		goto err_iounmap;
	}

	adap = &dev->adapter;
	i2c_set_adapdata(adap, dev);
	adap->owner = THIS_MODULE;
	adap->class = I2C_CLASS_HWMON;
	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
			sizeof(adap->name));
	adap->algo = &i2c_dw_algo;
	adap->dev.parent = &pdev->dev;
	adap->dev.of_node = pdev->dev.of_node;

	adap->nr = pdev->id;
	r = i2c_add_numbered_adapter(adap);
	if (r) {
		dev_err(&pdev->dev, "failure adding adapter\n");
		goto err_free_irq;
	}
	of_i2c_register_devices(adap);

	return 0;

err_free_irq:
	free_irq(dev->irq, dev);
err_iounmap:
	iounmap(dev->base);
err_unuse_clocks:
	clk_disable(dev->clk);
	clk_put(dev->clk);
	dev->clk = NULL;
err_free_mem:
	platform_set_drvdata(pdev, NULL);
	put_device(&pdev->dev);
	kfree(dev);
err_release_region:
	release_mem_region(mem->start, resource_size(mem));

	return r;
}

static int __devexit dw_i2c_remove(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	struct resource *mem;

	platform_set_drvdata(pdev, NULL);
	i2c_del_adapter(&dev->adapter);
	put_device(&pdev->dev);

	clk_disable(dev->clk);
	clk_put(dev->clk);
	dev->clk = NULL;

	i2c_dw_disable(dev);
	free_irq(dev->irq, dev);
	kfree(dev);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(mem->start, resource_size(mem));
	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id dw_i2c_of_match[] = {
	{ .compatible = "snps,designware-i2c", },
	{},
};
MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
#endif

#ifdef CONFIG_PM
static int dw_i2c_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);

	clk_disable(i_dev->clk);

	return 0;
}

static int dw_i2c_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);

	clk_enable(i_dev->clk);
	i2c_dw_init(i_dev);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume);

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:i2c_designware");

static struct platform_driver dw_i2c_driver = {
	.remove		= __devexit_p(dw_i2c_remove),
	.driver		= {
		.name	= "i2c_designware",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(dw_i2c_of_match),
		.pm	= &dw_i2c_dev_pm_ops,
	},
};

static int __init dw_i2c_init_driver(void)
{
	return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe);
}
subsys_initcall(dw_i2c_init_driver);

static void __exit dw_i2c_exit_driver(void)
{
	platform_driver_unregister(&dw_i2c_driver);
}
module_exit(dw_i2c_exit_driver);

MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
MODULE_LICENSE("GPL");
Commit	Line	Data
2373f6b9 DB	1	/*
	2	* Synopsys DesignWare I2C adapter driver (master only).
	3	*
	4	* Based on the TI DAVINCI I2C adapter driver.
	5	*
	6	* Copyright (C) 2006 Texas Instruments.
	7	* Copyright (C) 2007 MontaVista Software Inc.
	8	* Copyright (C) 2009 Provigent Ltd.
	9	*
	10	* ----------------------------------------------------------------------------
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	25	* ----------------------------------------------------------------------------
	26	*
	27	*/
	28	#include <linux/kernel.h>
	29	#include <linux/module.h>
	30	#include <linux/delay.h>
	31	#include <linux/i2c.h>
	32	#include <linux/clk.h>
	33	#include <linux/errno.h>
	34	#include <linux/sched.h>
	35	#include <linux/err.h>
	36	#include <linux/interrupt.h>
af71100c	37	#include <linux/of_i2c.h>
2373f6b9	38	#include <linux/platform_device.h>
3bf3b289	39	#include <linux/pm.h>
2373f6b9 DB	40	#include <linux/io.h>
	41	#include <linux/slab.h>
	42	#include "i2c-designware-core.h"
	43
	44	static struct i2c_algorithm i2c_dw_algo = {
	45	.master_xfer = i2c_dw_xfer,
	46	.functionality = i2c_dw_func,
	47	};
1d31b58f DB	48	static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
	49	{
	50	return clk_get_rate(dev->clk)/1000;
	51	}
2373f6b9 DB	52
	53	static int __devinit dw_i2c_probe(struct platform_device *pdev)
	54	{
	55	struct dw_i2c_dev *dev;
	56	struct i2c_adapter *adap;
	57	struct resource mem, ioarea;
	58	int irq, r;
	59
	60	/* NOTE: driver uses the static register mapping */
	61	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	62	if (!mem) {
	63	dev_err(&pdev->dev, "no mem resource?\n");
	64	return -EINVAL;
	65	}
	66
	67	irq = platform_get_irq(pdev, 0);
	68	if (irq < 0) {
	69	dev_err(&pdev->dev, "no irq resource?\n");
	70	return irq; /* -ENXIO */
	71	}
	72
	73	ioarea = request_mem_region(mem->start, resource_size(mem),
	74	pdev->name);
	75	if (!ioarea) {
	76	dev_err(&pdev->dev, "I2C region already claimed\n");
	77	return -EBUSY;
	78	}
	79
	80	dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
	81	if (!dev) {
	82	r = -ENOMEM;
	83	goto err_release_region;
	84	}
	85
	86	init_completion(&dev->cmd_complete);
	87	mutex_init(&dev->lock);
	88	dev->dev = get_device(&pdev->dev);
	89	dev->irq = irq;
	90	platform_set_drvdata(pdev, dev);
	91
	92	dev->clk = clk_get(&pdev->dev, NULL);
1d31b58f DB	93	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
1d31b58f DB	94
2373f6b9 DB	95	if (IS_ERR(dev->clk)) {
	96	r = -ENODEV;
	97	goto err_free_mem;
	98	}
	99	clk_enable(dev->clk);
	100
2fa8326b DB	101	dev->functionality =
	102	I2C_FUNC_I2C \|
	103	I2C_FUNC_10BIT_ADDR \|
	104	I2C_FUNC_SMBUS_BYTE \|
	105	I2C_FUNC_SMBUS_BYTE_DATA \|
	106	I2C_FUNC_SMBUS_WORD_DATA \|
	107	I2C_FUNC_SMBUS_I2C_BLOCK;
e18563fc DB	108	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
e18563fc DB	109	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_FAST;
2fa8326b	110
2373f6b9 DB	111	dev->base = ioremap(mem->start, resource_size(mem));
	112	if (dev->base == NULL) {
	113	dev_err(&pdev->dev, "failure mapping io resources\n");
	114	r = -EBUSY;
	115	goto err_unuse_clocks;
	116	}
	117	{
f3fa9f3d	118	u32 param1 = i2c_dw_read_comp_param(dev);
2373f6b9 DB	119
	120	dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
	121	dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
	122	}
	123	r = i2c_dw_init(dev);
	124	if (r)
	125	goto err_iounmap;
	126
f3fa9f3d	127	i2c_dw_disable_int(dev);
2373f6b9 DB	128	r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev);
	129	if (r) {
	130	dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
	131	goto err_iounmap;
	132	}
	133
	134	adap = &dev->adapter;
	135	i2c_set_adapdata(adap, dev);
	136	adap->owner = THIS_MODULE;
	137	adap->class = I2C_CLASS_HWMON;
	138	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
	139	sizeof(adap->name));
	140	adap->algo = &i2c_dw_algo;
	141	adap->dev.parent = &pdev->dev;
af71100c	142	adap->dev.of_node = pdev->dev.of_node;
2373f6b9 DB	143
	144	adap->nr = pdev->id;
	145	r = i2c_add_numbered_adapter(adap);
	146	if (r) {
	147	dev_err(&pdev->dev, "failure adding adapter\n");
	148	goto err_free_irq;
	149	}
af71100c	150	of_i2c_register_devices(adap);
2373f6b9 DB	151
	152	return 0;
	153
	154	err_free_irq:
	155	free_irq(dev->irq, dev);
	156	err_iounmap:
	157	iounmap(dev->base);
	158	err_unuse_clocks:
	159	clk_disable(dev->clk);
	160	clk_put(dev->clk);
	161	dev->clk = NULL;
	162	err_free_mem:
	163	platform_set_drvdata(pdev, NULL);
	164	put_device(&pdev->dev);
	165	kfree(dev);
	166	err_release_region:
	167	release_mem_region(mem->start, resource_size(mem));
	168
	169	return r;
	170	}
	171
	172	static int __devexit dw_i2c_remove(struct platform_device *pdev)
	173	{
	174	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	175	struct resource *mem;
	176
	177	platform_set_drvdata(pdev, NULL);
	178	i2c_del_adapter(&dev->adapter);
	179	put_device(&pdev->dev);
	180
	181	clk_disable(dev->clk);
	182	clk_put(dev->clk);
	183	dev->clk = NULL;
	184
f3fa9f3d	185	i2c_dw_disable(dev);
2373f6b9 DB	186	free_irq(dev->irq, dev);
	187	kfree(dev);
	188
	189	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	190	release_mem_region(mem->start, resource_size(mem));
	191	return 0;
	192	}
	193
af71100c RH	194	#ifdef CONFIG_OF
	195	static const struct of_device_id dw_i2c_of_match[] = {
	196	{ .compatible = "snps,designware-i2c", },
	197	{},
	198	};
	199	MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
	200	#endif
	201
3bf3b289 DS	202	#ifdef CONFIG_PM
	203	static int dw_i2c_suspend(struct device *dev)
	204	{
	205	struct platform_device *pdev = to_platform_device(dev);
	206	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	207
	208	clk_disable(i_dev->clk);
	209
	210	return 0;
	211	}
	212
	213	static int dw_i2c_resume(struct device *dev)
	214	{
	215	struct platform_device *pdev = to_platform_device(dev);
	216	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	217
	218	clk_enable(i_dev->clk);
	219	i2c_dw_init(i_dev);
	220
	221	return 0;
	222	}
	223	#endif
	224
	225	static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume);
	226
2373f6b9 DB	227	/* work with hotplug and coldplug */
	228	MODULE_ALIAS("platform:i2c_designware");
	229
	230	static struct platform_driver dw_i2c_driver = {
	231	.remove = __devexit_p(dw_i2c_remove),
	232	.driver = {
	233	.name = "i2c_designware",
	234	.owner = THIS_MODULE,
af71100c	235	.of_match_table = of_match_ptr(dw_i2c_of_match),
3bf3b289	236	.pm = &dw_i2c_dev_pm_ops,
2373f6b9 DB	237	},
	238	};
	239
	240	static int __init dw_i2c_init_driver(void)
	241	{
	242	return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe);
	243	}
10452280	244	subsys_initcall(dw_i2c_init_driver);
2373f6b9 DB	245
	246	static void __exit dw_i2c_exit_driver(void)
	247	{
	248	platform_driver_unregister(&dw_i2c_driver);
	249	}
	250	module_exit(dw_i2c_exit_driver);
	251
	252	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	253	MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
	254	MODULE_LICENSE("GPL");