[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.
 * ----------------------------------------------------------------------------
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/of.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 <linux/platform_data/i2c-designware.h>
#include "i2c-designware-core.h"

static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
{
	return clk_get_rate(dev->clk)/1000;
}

#ifdef CONFIG_ACPI
/*
 * The HCNT/LCNT information coming from ACPI should be the most accurate
 * for given platform. However, some systems get it wrong. On such systems
 * we get better results by calculating those based on the input clock.
 */
static const struct dmi_system_id dw_i2c_no_acpi_params[] = {
	{
		.ident = "Dell Inspiron 7348",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"),
		},
	},
	{ }
};

static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
			       u16 *hcnt, u16 *lcnt, u32 *sda_hold)
{
	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
	union acpi_object *obj;

	if (dmi_check_system(dw_i2c_no_acpi_params))
		return;

	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
		return;

	obj = (union acpi_object *)buf.pointer;
	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
		const union acpi_object *objs = obj->package.elements;

		*hcnt = (u16)objs[0].integer.value;
		*lcnt = (u16)objs[1].integer.value;
		if (sda_hold)
			*sda_hold = (u32)objs[2].integer.value;
	}

	kfree(buf.pointer);
}

static int dw_i2c_acpi_configure(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);

	dev->adapter.nr = -1;
	dev->tx_fifo_depth = 32;
	dev->rx_fifo_depth = 32;

	/*
	 * Try to get SDA hold time and *CNT values from an ACPI method if
	 * it exists for both supported speed modes.
	 */
	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
			   &dev->sda_hold_time);

	return 0;
}

static const struct acpi_device_id dw_i2c_acpi_match[] = {
	{ "INT33C2", 0 },
	{ "INT33C3", 0 },
	{ "INT3432", 0 },
	{ "INT3433", 0 },
	{ "80860F41", 0 },
	{ "808622C1", 0 },
	{ "AMD0010", 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_plat_probe(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev;
	struct i2c_adapter *adap;
	struct resource *mem;
	struct dw_i2c_platform_data *pdata;
	int irq, r;
	u32 clk_freq, ht = 0;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	dev->base = devm_ioremap_resource(&pdev->dev, mem);
	if (IS_ERR(dev->base))
		return PTR_ERR(dev->base);

	dev->dev = &pdev->dev;
	dev->irq = irq;
	platform_set_drvdata(pdev, dev);

	/* fast mode by default because of legacy reasons */
	clk_freq = 400000;

	if (has_acpi_companion(&pdev->dev)) {
		dw_i2c_acpi_configure(pdev);
	} else if (pdev->dev.of_node) {
		of_property_read_u32(pdev->dev.of_node,
					"i2c-sda-hold-time-ns", &ht);

		of_property_read_u32(pdev->dev.of_node,
				     "i2c-sda-falling-time-ns",
				     &dev->sda_falling_time);
		of_property_read_u32(pdev->dev.of_node,
				     "i2c-scl-falling-time-ns",
				     &dev->scl_falling_time);

		of_property_read_u32(pdev->dev.of_node, "clock-frequency",
				     &clk_freq);

		/* Only standard mode at 100kHz and fast mode at 400kHz
		 * are supported.
		 */
		if (clk_freq != 100000 && clk_freq != 400000) {
			dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
			return -EINVAL;
		}
	} else {
		pdata = dev_get_platdata(&pdev->dev);
		if (pdata)
			clk_freq = pdata->i2c_scl_freq;
	}

	r = i2c_dw_eval_lock_support(dev);
	if (r)
		return r;

	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;
	if (clk_freq == 100000)
		dev->master_cfg =  DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
			DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD;
	else
		dev->master_cfg =  DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
			DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;

	dev->clk = devm_clk_get(&pdev->dev, NULL);
	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
	if (IS_ERR(dev->clk))
		return PTR_ERR(dev->clk);
	clk_prepare_enable(dev->clk);

	if (!dev->sda_hold_time && ht) {
		u32 ic_clk = dev->get_clk_rate_khz(dev);

		dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
					     1000000);
	}

	if (!dev->tx_fifo_depth) {
		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;
	}

	adap = &dev->adapter;
	adap->owner = THIS_MODULE;
	adap->class = I2C_CLASS_DEPRECATED;
	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
	adap->dev.of_node = pdev->dev.of_node;

	if (dev->pm_runtime_disabled) {
		pm_runtime_forbid(&pdev->dev);
	} else {
		pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
		pm_runtime_use_autosuspend(&pdev->dev);
		pm_runtime_set_active(&pdev->dev);
		pm_runtime_enable(&pdev->dev);
	}

	r = i2c_dw_probe(dev);
	if (r) {
		pm_runtime_disable(&pdev->dev);
		return r;
	}

	return 0;
}

static int dw_i2c_plat_remove(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);

	pm_runtime_get_sync(&pdev->dev);

	i2c_del_adapter(&dev->adapter);

	i2c_dw_disable(dev);

	pm_runtime_dont_use_autosuspend(&pdev->dev);
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	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_SLEEP
static int dw_i2c_plat_prepare(struct device *dev)
{
	return pm_runtime_suspended(dev);
}

static void dw_i2c_plat_complete(struct device *dev)
{
	if (dev->power.direct_complete)
		pm_request_resume(dev);
}
#else
#define dw_i2c_plat_prepare	NULL
#define dw_i2c_plat_complete	NULL
#endif

#ifdef CONFIG_PM
static int dw_i2c_plat_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);

	i2c_dw_disable(i_dev);
	clk_disable_unprepare(i_dev->clk);

	return 0;
}

static int dw_i2c_plat_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);

	if (!i_dev->pm_runtime_disabled)
		i2c_dw_init(i_dev);

	return 0;
}

static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
	.prepare = dw_i2c_plat_prepare,
	.complete = dw_i2c_plat_complete,
	SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
	SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL)
};

#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
#else
#define DW_I2C_DEV_PMOPS NULL
#endif

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

static struct platform_driver dw_i2c_driver = {
	.probe = dw_i2c_plat_probe,
	.remove = dw_i2c_plat_remove,
	.driver		= {
		.name	= "i2c_designware",
		.of_match_table = of_match_ptr(dw_i2c_of_match),
		.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
		.pm	= DW_I2C_DEV_PMOPS,
	},
};

static int __init dw_i2c_init_driver(void)
{
	return platform_driver_register(&dw_i2c_driver);
}
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.
2373f6b9 DB	21	* ----------------------------------------------------------------------------
	22	*
	23	*/
	24	#include <linux/kernel.h>
	25	#include <linux/module.h>
	26	#include <linux/delay.h>
56d4b8a2	27	#include <linux/dmi.h>
2373f6b9 DB	28	#include <linux/i2c.h>
2373f6b9 DB	29	#include <linux/clk.h>
a445900c	30	#include <linux/clk-provider.h>
2373f6b9 DB	31	#include <linux/errno.h>
	32	#include <linux/sched.h>
	33	#include <linux/err.h>
	34	#include <linux/interrupt.h>
9803f868	35	#include <linux/of.h>
2373f6b9	36	#include <linux/platform_device.h>
3bf3b289	37	#include <linux/pm.h>
7272194e	38	#include <linux/pm_runtime.h>
2373f6b9 DB	39	#include <linux/io.h>
2373f6b9 DB	40	#include <linux/slab.h>
b61b1415	41	#include <linux/acpi.h>
4bcfda09	42	#include <linux/platform_data/i2c-designware.h>
2373f6b9 DB	43	#include "i2c-designware-core.h"
2373f6b9 DB	44
1d31b58f DB	45	static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
	46	{
	47	return clk_get_rate(dev->clk)/1000;
	48	}
2373f6b9	49
b61b1415	50	#ifdef CONFIG_ACPI
56d4b8a2 MW	51	/*
	52	* The HCNT/LCNT information coming from ACPI should be the most accurate
	53	* for given platform. However, some systems get it wrong. On such systems
	54	* we get better results by calculating those based on the input clock.
	55	*/
	56	static const struct dmi_system_id dw_i2c_no_acpi_params[] = {
	57	{
	58	.ident = "Dell Inspiron 7348",
	59	.matches = {
	60	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	61	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"),
	62	},
	63	},
	64	{ }
	65	};
	66
57cd1e30 MW	67	static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
	68	u16 hcnt, u16 lcnt, u32 *sda_hold)
	69	{
	70	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
	71	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
	72	union acpi_object *obj;
	73
56d4b8a2 MW	74	if (dmi_check_system(dw_i2c_no_acpi_params))
	75	return;
	76
57cd1e30 MW	77	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
	78	return;
	79
	80	obj = (union acpi_object *)buf.pointer;
	81	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
	82	const union acpi_object *objs = obj->package.elements;
	83
	84	*hcnt = (u16)objs[0].integer.value;
	85	*lcnt = (u16)objs[1].integer.value;
	86	if (sda_hold)
	87	*sda_hold = (u32)objs[2].integer.value;
	88	}
	89
	90	kfree(buf.pointer);
	91	}
	92
b61b1415 MW	93	static int dw_i2c_acpi_configure(struct platform_device *pdev)
	94	{
	95	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
b61b1415	96
b61b1415	97	dev->adapter.nr = -1;
b61b1415 MW	98	dev->tx_fifo_depth = 32;
b61b1415 MW	99	dev->rx_fifo_depth = 32;
57cd1e30 MW	100
	101	/*
	102	* Try to get SDA hold time and *CNT values from an ACPI method if
	103	* it exists for both supported speed modes.
	104	*/
0b26c845	105	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
57cd1e30	106	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
0b26c845	107	&dev->sda_hold_time);
57cd1e30	108
b61b1415 MW	109	return 0;
	110	}
	111
	112	static const struct acpi_device_id dw_i2c_acpi_match[] = {
	113	{ "INT33C2", 0 },
	114	{ "INT33C3", 0 },
25b3dfc8 MW	115	{ "INT3432", 0 },
25b3dfc8 MW	116	{ "INT3433", 0 },
5a7e6bd8	117	{ "80860F41", 0 },
0409516a	118	{ "808622C1", 0 },
3eddad96	119	{ "AMD0010", 0 },
b61b1415 MW	120	{ }
	121	};
	122	MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
	123	#else
	124	static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
	125	{
	126	return -ENODEV;
	127	}
	128	#endif
	129
6ad6fde3	130	static int dw_i2c_plat_probe(struct platform_device *pdev)
2373f6b9 DB	131	{
	132	struct dw_i2c_dev *dev;
	133	struct i2c_adapter *adap;
1cb715ca	134	struct resource *mem;
4bcfda09	135	struct dw_i2c_platform_data *pdata;
2373f6b9	136	int irq, r;
925ddb24	137	u32 clk_freq, ht = 0;
2373f6b9	138
2373f6b9	139	irq = platform_get_irq(pdev, 0);
b20d3864 AB	140	if (irq < 0)
b20d3864 AB	141	return irq;
2373f6b9	142
1cb715ca AS	143	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
	144	if (!dev)
	145	return -ENOMEM;
2373f6b9	146
3cc2d009	147	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1cb715ca AS	148	dev->base = devm_ioremap_resource(&pdev->dev, mem);
	149	if (IS_ERR(dev->base))
	150	return PTR_ERR(dev->base);
2373f6b9	151
1cb715ca	152	dev->dev = &pdev->dev;
2373f6b9 DB	153	dev->irq = irq;
	154	platform_set_drvdata(pdev, dev);
	155
8e5f6b2a RB	156	/* fast mode by default because of legacy reasons */
	157	clk_freq = 400000;
	158
ca5b74d2	159	if (has_acpi_companion(&pdev->dev)) {
925ddb24 MW	160	dw_i2c_acpi_configure(pdev);
925ddb24 MW	161	} else if (pdev->dev.of_node) {
9803f868 CR	162	of_property_read_u32(pdev->dev.of_node,
9803f868 CR	163	"i2c-sda-hold-time-ns", &ht);
6468276b RB	164
	165	of_property_read_u32(pdev->dev.of_node,
	166	"i2c-sda-falling-time-ns",
	167	&dev->sda_falling_time);
	168	of_property_read_u32(pdev->dev.of_node,
	169	"i2c-scl-falling-time-ns",
	170	&dev->scl_falling_time);
8e5f6b2a RB	171
	172	of_property_read_u32(pdev->dev.of_node, "clock-frequency",
	173	&clk_freq);
	174
	175	/* Only standard mode at 100kHz and fast mode at 400kHz
	176	* are supported.
	177	*/
	178	if (clk_freq != 100000 && clk_freq != 400000) {
	179	dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
	180	return -EINVAL;
	181	}
4bcfda09 TR	182	} else {
	183	pdata = dev_get_platdata(&pdev->dev);
	184	if (pdata)
	185	clk_freq = pdata->i2c_scl_freq;
9803f868 CR	186	}
9803f868 CR	187
894acb2f DB	188	r = i2c_dw_eval_lock_support(dev);
	189	if (r)
	190	return r;
	191
2fa8326b DB	192	dev->functionality =
	193	I2C_FUNC_I2C \|
	194	I2C_FUNC_10BIT_ADDR \|
	195	I2C_FUNC_SMBUS_BYTE \|
	196	I2C_FUNC_SMBUS_BYTE_DATA \|
	197	I2C_FUNC_SMBUS_WORD_DATA \|
	198	I2C_FUNC_SMBUS_I2C_BLOCK;
8e5f6b2a RB	199	if (clk_freq == 100000)
	200	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
	201	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_STD;
	202	else
	203	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
	204	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_FAST;
2fa8326b	205
925ddb24 MW	206	dev->clk = devm_clk_get(&pdev->dev, NULL);
	207	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
	208	if (IS_ERR(dev->clk))
	209	return PTR_ERR(dev->clk);
	210	clk_prepare_enable(dev->clk);
	211
	212	if (!dev->sda_hold_time && ht) {
	213	u32 ic_clk = dev->get_clk_rate_khz(dev);
	214
	215	dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
	216	1000000);
	217	}
	218
	219	if (!dev->tx_fifo_depth) {
f3fa9f3d	220	u32 param1 = i2c_dw_read_comp_param(dev);
2373f6b9 DB	221
	222	dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
	223	dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
b61b1415	224	dev->adapter.nr = pdev->id;
2373f6b9	225	}
2373f6b9 DB	226
2373f6b9 DB	227	adap = &dev->adapter;
2373f6b9	228	adap->owner = THIS_MODULE;
70fba830	229	adap->class = I2C_CLASS_DEPRECATED;
8eb5c87a	230	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
af71100c	231	adap->dev.of_node = pdev->dev.of_node;
2373f6b9	232
894acb2f DB	233	if (dev->pm_runtime_disabled) {
	234	pm_runtime_forbid(&pdev->dev);
	235	} else {
	236	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
	237	pm_runtime_use_autosuspend(&pdev->dev);
	238	pm_runtime_set_active(&pdev->dev);
	239	pm_runtime_enable(&pdev->dev);
	240	}
7272194e	241
d55fc378	242	r = i2c_dw_probe(dev);
36d48fb5	243	if (r) {
36d48fb5 WS	244	pm_runtime_disable(&pdev->dev);
	245	return r;
	246	}
	247
2373f6b9	248	return 0;
2373f6b9 DB	249	}
2373f6b9 DB	250
6ad6fde3	251	static int dw_i2c_plat_remove(struct platform_device *pdev)
2373f6b9 DB	252	{
2373f6b9 DB	253	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
2373f6b9	254
7272194e MW	255	pm_runtime_get_sync(&pdev->dev);
7272194e MW	256
2373f6b9	257	i2c_del_adapter(&dev->adapter);
2373f6b9	258
f3fa9f3d	259	i2c_dw_disable(dev);
2373f6b9	260
edfc3901 MW	261	pm_runtime_dont_use_autosuspend(&pdev->dev);
edfc3901 MW	262	pm_runtime_put_sync(&pdev->dev);
7272194e MW	263	pm_runtime_disable(&pdev->dev);
7272194e MW	264
2373f6b9 DB	265	return 0;
	266	}
	267
af71100c RH	268	#ifdef CONFIG_OF
	269	static const struct of_device_id dw_i2c_of_match[] = {
	270	{ .compatible = "snps,designware-i2c", },
	271	{},
	272	};
	273	MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
	274	#endif
	275
8503ff16	276	#ifdef CONFIG_PM_SLEEP
6ad6fde3	277	static int dw_i2c_plat_prepare(struct device *dev)
8503ff16 JZ	278	{
	279	return pm_runtime_suspended(dev);
	280	}
	281
6ad6fde3	282	static void dw_i2c_plat_complete(struct device *dev)
8503ff16 JZ	283	{
	284	if (dev->power.direct_complete)
	285	pm_request_resume(dev);
	286	}
	287	#else
319d7f05 JN	288	#define dw_i2c_plat_prepare NULL
319d7f05 JN	289	#define dw_i2c_plat_complete NULL
8503ff16 JZ	290	#endif
8503ff16 JZ	291
1fc2fe20	292	#ifdef CONFIG_PM
6ad6fde3	293	static int dw_i2c_plat_suspend(struct device *dev)
3bf3b289 DS	294	{
	295	struct platform_device *pdev = to_platform_device(dev);
	296	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	297
f537295a	298	i2c_dw_disable(i_dev);
e1fac69f	299	clk_disable_unprepare(i_dev->clk);
3bf3b289 DS	300
	301	return 0;
	302	}
	303
6ad6fde3	304	static int dw_i2c_plat_resume(struct device *dev)
3bf3b289 DS	305	{
	306	struct platform_device *pdev = to_platform_device(dev);
	307	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	308
e1fac69f	309	clk_prepare_enable(i_dev->clk);
894acb2f DB	310
	311	if (!i_dev->pm_runtime_disabled)
	312	i2c_dw_init(i_dev);
3bf3b289 DS	313
	314	return 0;
	315	}
3bf3b289	316
8503ff16	317	static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
6ad6fde3 JN	318	.prepare = dw_i2c_plat_prepare,
	319	.complete = dw_i2c_plat_complete,
	320	SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
	321	SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL)
8503ff16 JZ	322	};
	323
	324	#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
	325	#else
	326	#define DW_I2C_DEV_PMOPS NULL
	327	#endif
1fc2fe20	328
2373f6b9 DB	329	/* work with hotplug and coldplug */
	330	MODULE_ALIAS("platform:i2c_designware");
	331
	332	static struct platform_driver dw_i2c_driver = {
6ad6fde3 JN	333	.probe = dw_i2c_plat_probe,
6ad6fde3 JN	334	.remove = dw_i2c_plat_remove,
2373f6b9 DB	335	.driver = {
2373f6b9 DB	336	.name = "i2c_designware",
af71100c	337	.of_match_table = of_match_ptr(dw_i2c_of_match),
b61b1415	338	.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
8503ff16	339	.pm = DW_I2C_DEV_PMOPS,
2373f6b9 DB	340	},
	341	};
	342
	343	static int __init dw_i2c_init_driver(void)
	344	{
cccdcea1	345	return platform_driver_register(&dw_i2c_driver);
2373f6b9	346	}
10452280	347	subsys_initcall(dw_i2c_init_driver);
2373f6b9 DB	348
	349	static void __exit dw_i2c_exit_driver(void)
	350	{
	351	platform_driver_unregister(&dw_i2c_driver);
	352	}
	353	module_exit(dw_i2c_exit_driver);
	354
	355	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	356	MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
	357	MODULE_LICENSE("GPL");