[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / dwc2 / platform.c

/*
 * platform.c - DesignWare HS OTG Controller platform driver
 *
 * Copyright (C) Matthijs Kooijman <matthijs@stdin.nl>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the above-listed copyright holders may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>

#include "core.h"
#include "hcd.h"

static const char dwc2_driver_name[] = "dwc2";

/**
 * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
 * DWC_otg driver
 *
 * @dev: Platform device
 *
 * This routine is called, for example, when the rmmod command is executed. The
 * device may or may not be electrically present. If it is present, the driver
 * stops device processing. Any resources used on behalf of this device are
 * freed.
 */
static int dwc2_driver_remove(struct platform_device *dev)
{
	struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);

	dwc2_hcd_remove(hsotg);

	return 0;
}

/**
 * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
 * driver
 *
 * @dev: Platform device
 *
 * This routine creates the driver components required to control the device
 * (core, HCD, and PCD) and initializes the device. The driver components are
 * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
 * in the device private data. This allows the driver to access the dwc2_hsotg
 * structure on subsequent calls to driver methods for this device.
 */
static int dwc2_driver_probe(struct platform_device *dev)
{
	struct dwc2_hsotg *hsotg;
	struct resource *res;
	int retval;
	int irq;
	struct dwc2_core_params params;

	/* Default all params to autodetect */
	dwc2_set_all_params(&params, -1);

	hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
	if (!hsotg)
		return -ENOMEM;

	hsotg->dev = &dev->dev;

	/*
	 * Use reasonable defaults so platforms don't have to provide these.
	 */
	if (!dev->dev.dma_mask)
		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
	if (!dev->dev.coherent_dma_mask)
		dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

	irq = platform_get_irq(dev, 0);
	if (irq < 0) {
		dev_err(&dev->dev, "missing IRQ resource\n");
		return -EINVAL;
	}

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	hsotg->regs = devm_ioremap_resource(&dev->dev, res);
	if (IS_ERR(hsotg->regs))
		return PTR_ERR(hsotg->regs);

	dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
		(unsigned long)res->start, hsotg->regs);

	retval = dwc2_hcd_init(hsotg, irq, &params);
	if (retval)
		return retval;

	platform_set_drvdata(dev, hsotg);

	return retval;
}

static const struct of_device_id dwc2_of_match_table[] = {
	{ .compatible = "snps,dwc2" },
	{},
};
MODULE_DEVICE_TABLE(of, dwc2_of_match_table);

static struct platform_driver dwc2_platform_driver = {
	.driver = {
		.name = (char *)dwc2_driver_name,
		.of_match_table = dwc2_of_match_table,
	},
	.probe = dwc2_driver_probe,
	.remove = dwc2_driver_remove,
};

module_platform_driver(dwc2_platform_driver);

MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
MODULE_LICENSE("Dual BSD/GPL");
Commit	Line	Data
5b9974b1 MK	1	/*
	2	* platform.c - DesignWare HS OTG Controller platform driver
	3	*
	4	* Copyright (C) Matthijs Kooijman <matthijs@stdin.nl>
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions, and the following disclaimer,
	11	* without modification.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. The names of the above-listed copyright holders may not be used
	16	* to endorse or promote products derived from this software without
	17	* specific prior written permission.
	18	*
	19	* ALTERNATIVELY, this software may be distributed under the terms of the
	20	* GNU General Public License ("GPL") as published by the Free Software
	21	* Foundation; either version 2 of the License, or (at your option) any
	22	* later version.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
	25	* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	26	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	27	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
	28	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	29	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	30	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	31	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	32	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	33	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	34	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	#include <linux/kernel.h>
	38	#include <linux/module.h>
	39	#include <linux/slab.h>
	40	#include <linux/device.h>
	41	#include <linux/dma-mapping.h>
	42	#include <linux/platform_device.h>
	43
	44	#include "core.h"
	45	#include "hcd.h"
	46
	47	static const char dwc2_driver_name[] = "dwc2";
	48
	49	/**
	50	* dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
	51	* DWC_otg driver
	52	*
	53	* @dev: Platform device
	54	*
	55	* This routine is called, for example, when the rmmod command is executed. The
	56	* device may or may not be electrically present. If it is present, the driver
	57	* stops device processing. Any resources used on behalf of this device are
	58	* freed.
	59	*/
	60	static int dwc2_driver_remove(struct platform_device *dev)
	61	{
	62	struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
	63
	64	dwc2_hcd_remove(hsotg);
65
66	return 0;
67	}
68
69	/**
70	* dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
71	* driver
72	*
73	* @dev: Platform device
74	*
75	* This routine creates the driver components required to control the device
76	* (core, HCD, and PCD) and initializes the device. The driver components are
77	* stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
78	* in the device private data. This allows the driver to access the dwc2_hsotg
79	* structure on subsequent calls to driver methods for this device.
80	*/
81	static int dwc2_driver_probe(struct platform_device *dev)
82	{
83	struct dwc2_hsotg *hsotg;
84	struct resource *res;
85	int retval;
86	int irq;
87	struct dwc2_core_params params;
88
89	/* Default all params to autodetect */
90	dwc2_set_all_params(&params, -1);
91
92	hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
93	if (!hsotg)
94	return -ENOMEM;
95
96	hsotg->dev = &dev->dev;
97
642f2ecc MK	98	/*
	99	* Use reasonable defaults so platforms don't have to provide these.
	100	*/
	101	if (!dev->dev.dma_mask)
	102	dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
	103	if (!dev->dev.coherent_dma_mask)
	104	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
	105
5b9974b1 MK	106	irq = platform_get_irq(dev, 0);
	107	if (irq < 0) {
	108	dev_err(&dev->dev, "missing IRQ resource\n");
	109	return -EINVAL;
	110	}
	111
	112	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
5b9974b1 MK	113	hsotg->regs = devm_ioremap_resource(&dev->dev, res);
	114	if (IS_ERR(hsotg->regs))
	115	return PTR_ERR(hsotg->regs);
	116
	117	dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
	118	(unsigned long)res->start, hsotg->regs);
	119
	120	retval = dwc2_hcd_init(hsotg, irq, &params);
	121	if (retval)
	122	return retval;
	123
	124	platform_set_drvdata(dev, hsotg);
	125
	126	return retval;
	127	}
	128
	129	static const struct of_device_id dwc2_of_match_table[] = {
	130	{ .compatible = "snps,dwc2" },
	131	{},
	132	};
	133	MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
	134
	135	static struct platform_driver dwc2_platform_driver = {
	136	.driver = {
	137	.name = (char *)dwc2_driver_name,
	138	.of_match_table = dwc2_of_match_table,
	139	},
	140	.probe = dwc2_driver_probe,
	141	.remove = dwc2_driver_remove,
	142	};
	143
	144	module_platform_driver(dwc2_platform_driver);
	145
	146	MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
	147	MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
	148	MODULE_LICENSE("Dual BSD/GPL");