[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/pm_runtime.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/acpi.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;
}

#ifdef CONFIG_ACPI
static int dw_i2c_acpi_configure(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	struct acpi_device *adev;
	int busno, ret;

	if (!ACPI_HANDLE(&pdev->dev))
		return -ENODEV;

	ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
	if (ret)
		return -ENODEV;

	dev->adapter.nr = -1;
	if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &busno))
		dev->adapter.nr = busno;

	dev->tx_fifo_depth = 32;
	dev->rx_fifo_depth = 32;
	return 0;
}

static const struct acpi_device_id dw_i2c_acpi_match[] = {
	{ "INT33C2", 0 },
	{ "INT33C3", 0 },
	{ }
};
MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
#else
static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
{
	return -ENODEV;
}
#endif

static int 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_prepare_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;
	}

	/* Try first if we can configure the device from ACPI */
	r = dw_i2c_acpi_configure(pdev);
	if (r) {
		u32 param1 = i2c_dw_read_comp_param(dev);

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

	i2c_dw_disable_int(dev);
	r = request_irq(dev->irq, i2c_dw_isr, IRQF_SHARED, 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;
	ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev));

	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);
	acpi_i2c_register_devices(adap);

	pm_runtime_set_active(&pdev->dev);
	pm_runtime_enable(&pdev->dev);
	pm_runtime_put(&pdev->dev);

	return 0;

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

	return r;
}

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

	pm_runtime_get_sync(&pdev->dev);

	i2c_del_adapter(&dev->adapter);
	put_device(&pdev->dev);

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

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

	pm_runtime_put(&pdev->dev);
	pm_runtime_disable(&pdev->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_unprepare(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_prepare_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		= dw_i2c_remove,
	.driver		= {
		.name	= "i2c_designware",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(dw_i2c_of_match),
		.acpi_match_table = ACPI_PTR(dw_i2c_acpi_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>
7272194e	40	#include <linux/pm_runtime.h>
2373f6b9 DB	41	#include <linux/io.h>
2373f6b9 DB	42	#include <linux/slab.h>
b61b1415	43	#include <linux/acpi.h>
2373f6b9 DB	44	#include "i2c-designware-core.h"
	45
	46	static struct i2c_algorithm i2c_dw_algo = {
	47	.master_xfer = i2c_dw_xfer,
	48	.functionality = i2c_dw_func,
	49	};
1d31b58f DB	50	static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
	51	{
	52	return clk_get_rate(dev->clk)/1000;
	53	}
2373f6b9	54
b61b1415 MW	55	#ifdef CONFIG_ACPI
	56	static int dw_i2c_acpi_configure(struct platform_device *pdev)
	57	{
	58	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	59	struct acpi_device *adev;
	60	int busno, ret;
	61
	62	if (!ACPI_HANDLE(&pdev->dev))
	63	return -ENODEV;
	64
	65	ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
	66	if (ret)
	67	return -ENODEV;
	68
	69	dev->adapter.nr = -1;
	70	if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &busno))
	71	dev->adapter.nr = busno;
	72
	73	dev->tx_fifo_depth = 32;
	74	dev->rx_fifo_depth = 32;
	75	return 0;
	76	}
	77
	78	static const struct acpi_device_id dw_i2c_acpi_match[] = {
	79	{ "INT33C2", 0 },
	80	{ "INT33C3", 0 },
	81	{ }
	82	};
	83	MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
	84	#else
	85	static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
	86	{
	87	return -ENODEV;
	88	}
	89	#endif
	90
0b255e92	91	static int dw_i2c_probe(struct platform_device *pdev)
2373f6b9 DB	92	{
	93	struct dw_i2c_dev *dev;
	94	struct i2c_adapter *adap;
	95	struct resource mem, ioarea;
	96	int irq, r;
	97
	98	/* NOTE: driver uses the static register mapping */
	99	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	100	if (!mem) {
	101	dev_err(&pdev->dev, "no mem resource?\n");
	102	return -EINVAL;
	103	}
	104
	105	irq = platform_get_irq(pdev, 0);
	106	if (irq < 0) {
	107	dev_err(&pdev->dev, "no irq resource?\n");
	108	return irq; /* -ENXIO */
	109	}
	110
	111	ioarea = request_mem_region(mem->start, resource_size(mem),
	112	pdev->name);
	113	if (!ioarea) {
	114	dev_err(&pdev->dev, "I2C region already claimed\n");
	115	return -EBUSY;
	116	}
	117
	118	dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
	119	if (!dev) {
	120	r = -ENOMEM;
	121	goto err_release_region;
	122	}
	123
	124	init_completion(&dev->cmd_complete);
	125	mutex_init(&dev->lock);
	126	dev->dev = get_device(&pdev->dev);
	127	dev->irq = irq;
	128	platform_set_drvdata(pdev, dev);
	129
	130	dev->clk = clk_get(&pdev->dev, NULL);
1d31b58f DB	131	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
1d31b58f DB	132
2373f6b9 DB	133	if (IS_ERR(dev->clk)) {
	134	r = -ENODEV;
	135	goto err_free_mem;
	136	}
e1fac69f	137	clk_prepare_enable(dev->clk);
2373f6b9	138
2fa8326b DB	139	dev->functionality =
	140	I2C_FUNC_I2C \|
	141	I2C_FUNC_10BIT_ADDR \|
	142	I2C_FUNC_SMBUS_BYTE \|
	143	I2C_FUNC_SMBUS_BYTE_DATA \|
	144	I2C_FUNC_SMBUS_WORD_DATA \|
	145	I2C_FUNC_SMBUS_I2C_BLOCK;
e18563fc DB	146	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
e18563fc DB	147	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_FAST;
2fa8326b	148
2373f6b9 DB	149	dev->base = ioremap(mem->start, resource_size(mem));
	150	if (dev->base == NULL) {
	151	dev_err(&pdev->dev, "failure mapping io resources\n");
	152	r = -EBUSY;
	153	goto err_unuse_clocks;
	154	}
b61b1415 MW	155
	156	/* Try first if we can configure the device from ACPI */
	157	r = dw_i2c_acpi_configure(pdev);
	158	if (r) {
f3fa9f3d	159	u32 param1 = i2c_dw_read_comp_param(dev);
2373f6b9 DB	160
	161	dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
	162	dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
b61b1415	163	dev->adapter.nr = pdev->id;
2373f6b9 DB	164	}
	165	r = i2c_dw_init(dev);
	166	if (r)
	167	goto err_iounmap;
	168
f3fa9f3d	169	i2c_dw_disable_int(dev);
b61b1415	170	r = request_irq(dev->irq, i2c_dw_isr, IRQF_SHARED, pdev->name, dev);
2373f6b9 DB	171	if (r) {
	172	dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
	173	goto err_iounmap;
	174	}
	175
	176	adap = &dev->adapter;
	177	i2c_set_adapdata(adap, dev);
	178	adap->owner = THIS_MODULE;
	179	adap->class = I2C_CLASS_HWMON;
	180	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
	181	sizeof(adap->name));
	182	adap->algo = &i2c_dw_algo;
	183	adap->dev.parent = &pdev->dev;
af71100c	184	adap->dev.of_node = pdev->dev.of_node;
b61b1415	185	ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev));
2373f6b9	186
2373f6b9 DB	187	r = i2c_add_numbered_adapter(adap);
	188	if (r) {
	189	dev_err(&pdev->dev, "failure adding adapter\n");
	190	goto err_free_irq;
	191	}
af71100c	192	of_i2c_register_devices(adap);
b61b1415	193	acpi_i2c_register_devices(adap);
2373f6b9	194
7272194e MW	195	pm_runtime_set_active(&pdev->dev);
	196	pm_runtime_enable(&pdev->dev);
	197	pm_runtime_put(&pdev->dev);
	198
2373f6b9 DB	199	return 0;
	200
	201	err_free_irq:
	202	free_irq(dev->irq, dev);
	203	err_iounmap:
	204	iounmap(dev->base);
	205	err_unuse_clocks:
e1fac69f	206	clk_disable_unprepare(dev->clk);
2373f6b9 DB	207	clk_put(dev->clk);
	208	dev->clk = NULL;
	209	err_free_mem:
2373f6b9 DB	210	put_device(&pdev->dev);
	211	kfree(dev);
	212	err_release_region:
	213	release_mem_region(mem->start, resource_size(mem));
	214
	215	return r;
	216	}
	217
0b255e92	218	static int dw_i2c_remove(struct platform_device *pdev)
2373f6b9 DB	219	{
	220	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	221	struct resource *mem;
	222
7272194e MW	223	pm_runtime_get_sync(&pdev->dev);
7272194e MW	224
2373f6b9 DB	225	i2c_del_adapter(&dev->adapter);
	226	put_device(&pdev->dev);
	227
e1fac69f	228	clk_disable_unprepare(dev->clk);
2373f6b9 DB	229	clk_put(dev->clk);
	230	dev->clk = NULL;
	231
f3fa9f3d	232	i2c_dw_disable(dev);
2373f6b9 DB	233	free_irq(dev->irq, dev);
	234	kfree(dev);
	235
7272194e MW	236	pm_runtime_put(&pdev->dev);
	237	pm_runtime_disable(&pdev->dev);
	238
2373f6b9 DB	239	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	240	release_mem_region(mem->start, resource_size(mem));
	241	return 0;
	242	}
	243
af71100c RH	244	#ifdef CONFIG_OF
	245	static const struct of_device_id dw_i2c_of_match[] = {
	246	{ .compatible = "snps,designware-i2c", },
	247	{},
	248	};
	249	MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
	250	#endif
	251
3bf3b289 DS	252	#ifdef CONFIG_PM
	253	static int dw_i2c_suspend(struct device *dev)
	254	{
	255	struct platform_device *pdev = to_platform_device(dev);
	256	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	257
e1fac69f	258	clk_disable_unprepare(i_dev->clk);
3bf3b289 DS	259
	260	return 0;
	261	}
	262
	263	static int dw_i2c_resume(struct device *dev)
	264	{
	265	struct platform_device *pdev = to_platform_device(dev);
	266	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	267
e1fac69f	268	clk_prepare_enable(i_dev->clk);
3bf3b289 DS	269	i2c_dw_init(i_dev);
	270
	271	return 0;
	272	}
	273	#endif
	274
	275	static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume);
	276
2373f6b9 DB	277	/* work with hotplug and coldplug */
	278	MODULE_ALIAS("platform:i2c_designware");
	279
	280	static struct platform_driver dw_i2c_driver = {
0b255e92	281	.remove = dw_i2c_remove,
2373f6b9 DB	282	.driver = {
	283	.name = "i2c_designware",
	284	.owner = THIS_MODULE,
af71100c	285	.of_match_table = of_match_ptr(dw_i2c_of_match),
b61b1415	286	.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
3bf3b289	287	.pm = &dw_i2c_dev_pm_ops,
2373f6b9 DB	288	},
	289	};
	290
	291	static int __init dw_i2c_init_driver(void)
	292	{
	293	return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe);
	294	}
10452280	295	subsys_initcall(dw_i2c_init_driver);
2373f6b9 DB	296
	297	static void __exit dw_i2c_exit_driver(void)
	298	{
	299	platform_driver_unregister(&dw_i2c_driver);
	300	}
	301	module_exit(dw_i2c_exit_driver);
	302
	303	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	304	MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
	305	MODULE_LICENSE("GPL");