[mirror_ubuntu-artful-kernel.git] / drivers / usb / phy / phy-generic.c

/*
 * drivers/usb/otg/nop-usb-xceiv.c
 *
 * NOP USB transceiver for all USB transceiver which are either built-in
 * into USB IP or which are mostly autonomous.
 *
 * Copyright (C) 2009 Texas Instruments Inc
 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
 *
 * 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.
 *
 * Current status:
 *	This provides a "nop" transceiver for PHYs which are
 *	autonomous such as isp1504, isp1707, etc.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/usb/otg.h>
#include <linux/usb/usb_phy_gen_xceiv.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/delay.h>

#include "phy-generic.h"

static struct platform_device *pd;

void usb_nop_xceiv_register(void)
{
	if (pd)
		return;
	pd = platform_device_register_simple("usb_phy_gen_xceiv", -1, NULL, 0);
	if (!pd) {
		pr_err("Unable to register generic usb transceiver\n");
		return;
	}
}
EXPORT_SYMBOL(usb_nop_xceiv_register);

void usb_nop_xceiv_unregister(void)
{
	platform_device_unregister(pd);
	pd = NULL;
}
EXPORT_SYMBOL(usb_nop_xceiv_unregister);

static int nop_set_suspend(struct usb_phy *x, int suspend)
{
	return 0;
}

static void nop_reset_set(struct usb_phy_gen_xceiv *nop, int asserted)
{
	int value;

	if (!gpio_is_valid(nop->gpio_reset))
		return;

	value = asserted;
	if (nop->reset_active_low)
		value = !value;

	gpio_set_value_cansleep(nop->gpio_reset, value);

	if (!asserted)
		usleep_range(10000, 20000);
}

int usb_gen_phy_init(struct usb_phy *phy)
{
	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);

	if (!IS_ERR(nop->vcc)) {
		if (regulator_enable(nop->vcc))
			dev_err(phy->dev, "Failed to enable power\n");
	}

	if (!IS_ERR(nop->clk))
		clk_prepare_enable(nop->clk);

	/* De-assert RESET */
	nop_reset_set(nop, 0);

	return 0;
}
EXPORT_SYMBOL_GPL(usb_gen_phy_init);

void usb_gen_phy_shutdown(struct usb_phy *phy)
{
	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);

	/* Assert RESET */
	nop_reset_set(nop, 1);

	if (!IS_ERR(nop->clk))
		clk_disable_unprepare(nop->clk);

	if (!IS_ERR(nop->vcc)) {
		if (regulator_disable(nop->vcc))
			dev_err(phy->dev, "Failed to disable power\n");
	}
}
EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);

static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
{
	if (!otg)
		return -ENODEV;

	if (!gadget) {
		otg->gadget = NULL;
		return -ENODEV;
	}

	otg->gadget = gadget;
	otg->phy->state = OTG_STATE_B_IDLE;
	return 0;
}

static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
{
	if (!otg)
		return -ENODEV;

	if (!host) {
		otg->host = NULL;
		return -ENODEV;
	}

	otg->host = host;
	return 0;
}

int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_gen_xceiv *nop,
		struct usb_phy_gen_xceiv_platform_data *pdata)
{
	enum usb_phy_type type = USB_PHY_TYPE_USB2;
	int err;

	u32 clk_rate = 0;
	bool needs_vcc = false;

	nop->reset_active_low = true;	/* default behaviour */

	if (dev->of_node) {
		struct device_node *node = dev->of_node;
		enum of_gpio_flags flags;

		if (of_property_read_u32(node, "clock-frequency", &clk_rate))
			clk_rate = 0;

		needs_vcc = of_property_read_bool(node, "vcc-supply");
		nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
								0, &flags);
		if (nop->gpio_reset == -EPROBE_DEFER)
			return -EPROBE_DEFER;

		nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;

	} else if (pdata) {
		type = pdata->type;
		clk_rate = pdata->clk_rate;
		needs_vcc = pdata->needs_vcc;
		nop->gpio_reset = pdata->gpio_reset;
	} else {
		nop->gpio_reset = -1;
	}

	nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
			GFP_KERNEL);
	if (!nop->phy.otg)
		return -ENOMEM;

	nop->clk = devm_clk_get(dev, "main_clk");
	if (IS_ERR(nop->clk)) {
		dev_dbg(dev, "Can't get phy clock: %ld\n",
					PTR_ERR(nop->clk));
	}

	if (!IS_ERR(nop->clk) && clk_rate) {
		err = clk_set_rate(nop->clk, clk_rate);
		if (err) {
			dev_err(dev, "Error setting clock rate\n");
			return err;
		}
	}

	nop->vcc = devm_regulator_get(dev, "vcc");
	if (IS_ERR(nop->vcc)) {
		dev_dbg(dev, "Error getting vcc regulator: %ld\n",
					PTR_ERR(nop->vcc));
		if (needs_vcc)
			return -EPROBE_DEFER;
	}

	if (gpio_is_valid(nop->gpio_reset)) {
		unsigned long gpio_flags;

		/* Assert RESET */
		if (nop->reset_active_low)
			gpio_flags = GPIOF_OUT_INIT_LOW;
		else
			gpio_flags = GPIOF_OUT_INIT_HIGH;

		err = devm_gpio_request_one(dev, nop->gpio_reset,
						gpio_flags, dev_name(dev));
		if (err) {
			dev_err(dev, "Error requesting RESET GPIO %d\n",
					nop->gpio_reset);
			return err;
		}
	}

	nop->dev		= dev;
	nop->phy.dev		= nop->dev;
	nop->phy.label		= "nop-xceiv";
	nop->phy.set_suspend	= nop_set_suspend;
	nop->phy.state		= OTG_STATE_UNDEFINED;
	nop->phy.type		= type;

	nop->phy.otg->phy		= &nop->phy;
	nop->phy.otg->set_host		= nop_set_host;
	nop->phy.otg->set_peripheral	= nop_set_peripheral;

	ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);
	return 0;
}
EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);

static int usb_phy_gen_xceiv_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct usb_phy_gen_xceiv	*nop;
	int err;

	nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
	if (!nop)
		return -ENOMEM;

	err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
	if (err)
		return err;

	nop->phy.init		= usb_gen_phy_init;
	nop->phy.shutdown	= usb_gen_phy_shutdown;

	err = usb_add_phy_dev(&nop->phy);
	if (err) {
		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
			err);
		return err;
	}

	platform_set_drvdata(pdev, nop);

	return 0;
}

static int usb_phy_gen_xceiv_remove(struct platform_device *pdev)
{
	struct usb_phy_gen_xceiv *nop = platform_get_drvdata(pdev);

	usb_remove_phy(&nop->phy);

	return 0;
}

static const struct of_device_id nop_xceiv_dt_ids[] = {
	{ .compatible = "usb-nop-xceiv" },
	{ }
};

MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);

static struct platform_driver usb_phy_gen_xceiv_driver = {
	.probe		= usb_phy_gen_xceiv_probe,
	.remove		= usb_phy_gen_xceiv_remove,
	.driver		= {
		.name	= "usb_phy_gen_xceiv",
		.owner	= THIS_MODULE,
		.of_match_table = nop_xceiv_dt_ids,
	},
};

static int __init usb_phy_gen_xceiv_init(void)
{
	return platform_driver_register(&usb_phy_gen_xceiv_driver);
}
subsys_initcall(usb_phy_gen_xceiv_init);

static void __exit usb_phy_gen_xceiv_exit(void)
{
	platform_driver_unregister(&usb_phy_gen_xceiv_driver);
}
module_exit(usb_phy_gen_xceiv_exit);

MODULE_ALIAS("platform:usb_phy_gen_xceiv");
MODULE_AUTHOR("Texas Instruments Inc");
MODULE_DESCRIPTION("NOP USB Transceiver driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f6d92a05 AKG	1	/*
	2	* drivers/usb/otg/nop-usb-xceiv.c
	3	*
	4	* NOP USB transceiver for all USB transceiver which are either built-in
	5	* into USB IP or which are mostly autonomous.
	6	*
	7	* Copyright (C) 2009 Texas Instruments Inc
	8	* Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	23	*
	24	* Current status:
cc835e32 DB	25	* This provides a "nop" transceiver for PHYs which are
cc835e32 DB	26	* autonomous such as isp1504, isp1707, etc.
f6d92a05 AKG	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/dma-mapping.h>
	32	#include <linux/usb/otg.h>
3fa4d734	33	#include <linux/usb/usb_phy_gen_xceiv.h>
5a0e3ad6	34	#include <linux/slab.h>
2319fb88	35	#include <linux/clk.h>
58f735fe	36	#include <linux/regulator/consumer.h>
0eba3879	37	#include <linux/of.h>
bd27fa44 RQ	38	#include <linux/of_gpio.h>
	39	#include <linux/gpio.h>
	40	#include <linux/delay.h>
f6d92a05	41
53b6fc28	42	#include "phy-generic.h"
f6d92a05	43
cc835e32	44	static struct platform_device *pd;
f6d92a05 AKG	45
	46	void usb_nop_xceiv_register(void)
	47	{
cc835e32 DB	48	if (pd)
cc835e32 DB	49	return;
3fa4d734	50	pd = platform_device_register_simple("usb_phy_gen_xceiv", -1, NULL, 0);
cc835e32	51	if (!pd) {
3fa4d734	52	pr_err("Unable to register generic usb transceiver\n");
f6d92a05 AKG	53	return;
	54	}
	55	}
cc835e32	56	EXPORT_SYMBOL(usb_nop_xceiv_register);
f6d92a05 AKG	57
	58	void usb_nop_xceiv_unregister(void)
	59	{
cc835e32	60	platform_device_unregister(pd);
dc7520c1	61	pd = NULL;
f6d92a05	62	}
cc835e32	63	EXPORT_SYMBOL(usb_nop_xceiv_unregister);
f6d92a05	64
86753811	65	static int nop_set_suspend(struct usb_phy *x, int suspend)
f6d92a05 AKG	66	{
	67	return 0;
	68	}
	69
bd27fa44 RQ	70	static void nop_reset_set(struct usb_phy_gen_xceiv *nop, int asserted)
	71	{
	72	int value;
	73
	74	if (!gpio_is_valid(nop->gpio_reset))
	75	return;
	76
	77	value = asserted;
	78	if (nop->reset_active_low)
	79	value = !value;
	80
	81	gpio_set_value_cansleep(nop->gpio_reset, value);
	82
	83	if (!asserted)
	84	usleep_range(10000, 20000);
	85	}
	86
53b6fc28	87	int usb_gen_phy_init(struct usb_phy *phy)
2319fb88	88	{
3fa4d734	89	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);
2319fb88	90
58f735fe RQ	91	if (!IS_ERR(nop->vcc)) {
	92	if (regulator_enable(nop->vcc))
	93	dev_err(phy->dev, "Failed to enable power\n");
	94	}
	95
2319fb88	96	if (!IS_ERR(nop->clk))
4d175f34	97	clk_prepare_enable(nop->clk);
2319fb88	98
bd27fa44 RQ	99	/* De-assert RESET */
bd27fa44 RQ	100	nop_reset_set(nop, 0);
ad63ebfc	101
2319fb88 RQ	102	return 0;
2319fb88 RQ	103	}
53b6fc28	104	EXPORT_SYMBOL_GPL(usb_gen_phy_init);
2319fb88	105
53b6fc28	106	void usb_gen_phy_shutdown(struct usb_phy *phy)
2319fb88	107	{
3fa4d734	108	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);
2319fb88	109
bd27fa44 RQ	110	/* Assert RESET */
bd27fa44 RQ	111	nop_reset_set(nop, 1);
ad63ebfc	112
2319fb88	113	if (!IS_ERR(nop->clk))
4d175f34	114	clk_disable_unprepare(nop->clk);
58f735fe RQ	115
	116	if (!IS_ERR(nop->vcc)) {
	117	if (regulator_disable(nop->vcc))
	118	dev_err(phy->dev, "Failed to disable power\n");
	119	}
2319fb88	120	}
53b6fc28	121	EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);
2319fb88	122
41adf109	123	static int nop_set_peripheral(struct usb_otg otg, struct usb_gadget gadget)
f6d92a05	124	{
41adf109	125	if (!otg)
f6d92a05 AKG	126	return -ENODEV;
f6d92a05 AKG	127
f6d92a05	128	if (!gadget) {
41adf109	129	otg->gadget = NULL;
f6d92a05 AKG	130	return -ENODEV;
	131	}
	132
41adf109 HK	133	otg->gadget = gadget;
41adf109 HK	134	otg->phy->state = OTG_STATE_B_IDLE;
f6d92a05 AKG	135	return 0;
	136	}
	137
41adf109	138	static int nop_set_host(struct usb_otg otg, struct usb_bus host)
f6d92a05	139	{
41adf109	140	if (!otg)
f6d92a05 AKG	141	return -ENODEV;
f6d92a05 AKG	142
f6d92a05	143	if (!host) {
41adf109	144	otg->host = NULL;
f6d92a05 AKG	145	return -ENODEV;
	146	}
	147
41adf109	148	otg->host = host;
f6d92a05 AKG	149	return 0;
	150	}
	151
53b6fc28	152	int usb_phy_gen_create_phy(struct device dev, struct usb_phy_gen_xceiv nop,
af9f51c5	153	struct usb_phy_gen_xceiv_platform_data *pdata)
f6d92a05	154	{
af9f51c5	155	enum usb_phy_type type = USB_PHY_TYPE_USB2;
f6d92a05 AKG	156	int err;
f6d92a05 AKG	157
af9f51c5 FB	158	u32 clk_rate = 0;
	159	bool needs_vcc = false;
	160
	161	nop->reset_active_low = true; /* default behaviour */
	162
	163	if (dev->of_node) {
	164	struct device_node *node = dev->of_node;
	165	enum of_gpio_flags flags;
	166
	167	if (of_property_read_u32(node, "clock-frequency", &clk_rate))
	168	clk_rate = 0;
	169
	170	needs_vcc = of_property_read_bool(node, "vcc-supply");
	171	nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
	172	0, &flags);
	173	if (nop->gpio_reset == -EPROBE_DEFER)
	174	return -EPROBE_DEFER;
	175
	176	nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;
	177
	178	} else if (pdata) {
	179	type = pdata->type;
	180	clk_rate = pdata->clk_rate;
	181	needs_vcc = pdata->needs_vcc;
	182	nop->gpio_reset = pdata->gpio_reset;
dc52c574 AK	183	} else {
dc52c574 AK	184	nop->gpio_reset = -1;
af9f51c5 FB	185	}
af9f51c5 FB	186
53b6fc28 SAS	187	nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
53b6fc28 SAS	188	GFP_KERNEL);
e4d7dc66	189	if (!nop->phy.otg)
41adf109	190	return -ENOMEM;
41adf109	191
53b6fc28	192	nop->clk = devm_clk_get(dev, "main_clk");
2319fb88	193	if (IS_ERR(nop->clk)) {
53b6fc28	194	dev_dbg(dev, "Can't get phy clock: %ld\n",
2319fb88 RQ	195	PTR_ERR(nop->clk));
	196	}
	197
0eba3879 RQ	198	if (!IS_ERR(nop->clk) && clk_rate) {
0eba3879 RQ	199	err = clk_set_rate(nop->clk, clk_rate);
2319fb88	200	if (err) {
53b6fc28	201	dev_err(dev, "Error setting clock rate\n");
2319fb88 RQ	202	return err;
	203	}
	204	}
	205
53b6fc28	206	nop->vcc = devm_regulator_get(dev, "vcc");
58f735fe	207	if (IS_ERR(nop->vcc)) {
53b6fc28	208	dev_dbg(dev, "Error getting vcc regulator: %ld\n",
58f735fe	209	PTR_ERR(nop->vcc));
b54b5f56 RQ	210	if (needs_vcc)
b54b5f56 RQ	211	return -EPROBE_DEFER;
58f735fe RQ	212	}
58f735fe RQ	213
bd27fa44 RQ	214	if (gpio_is_valid(nop->gpio_reset)) {
	215	unsigned long gpio_flags;
	216
	217	/* Assert RESET */
	218	if (nop->reset_active_low)
	219	gpio_flags = GPIOF_OUT_INIT_LOW;
	220	else
	221	gpio_flags = GPIOF_OUT_INIT_HIGH;
	222
	223	err = devm_gpio_request_one(dev, nop->gpio_reset,
	224	gpio_flags, dev_name(dev));
	225	if (err) {
	226	dev_err(dev, "Error requesting RESET GPIO %d\n",
	227	nop->gpio_reset);
	228	return err;
	229	}
ad63ebfc RQ	230	}
ad63ebfc RQ	231
53b6fc28	232	nop->dev = dev;
41adf109 HK	233	nop->phy.dev = nop->dev;
	234	nop->phy.label = "nop-xceiv";
	235	nop->phy.set_suspend = nop_set_suspend;
	236	nop->phy.state = OTG_STATE_UNDEFINED;
90f4232f	237	nop->phy.type = type;
41adf109 HK	238
	239	nop->phy.otg->phy = &nop->phy;
	240	nop->phy.otg->set_host = nop_set_host;
	241	nop->phy.otg->set_peripheral = nop_set_peripheral;
	242
53b6fc28 SAS	243	ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);
	244	return 0;
	245	}
	246	EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);
	247
53b6fc28 SAS	248	static int usb_phy_gen_xceiv_probe(struct platform_device *pdev)
	249	{
	250	struct device *dev = &pdev->dev;
53b6fc28	251	struct usb_phy_gen_xceiv *nop;
53b6fc28	252	int err;
bd27fa44 RQ	253
	254	nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
	255	if (!nop)
	256	return -ENOMEM;
	257
af9f51c5	258	err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
53b6fc28 SAS	259	if (err)
	260	return err;
	261
	262	nop->phy.init = usb_gen_phy_init;
	263	nop->phy.shutdown = usb_gen_phy_shutdown;
	264
90f4232f	265	err = usb_add_phy_dev(&nop->phy);
f6d92a05 AKG	266	if (err) {
	267	dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
	268	err);
4d175f34	269	return err;
f6d92a05 AKG	270	}
	271
	272	platform_set_drvdata(pdev, nop);
	273
	274	return 0;
f6d92a05 AKG	275	}
f6d92a05 AKG	276
3fa4d734	277	static int usb_phy_gen_xceiv_remove(struct platform_device *pdev)
f6d92a05	278	{
3fa4d734	279	struct usb_phy_gen_xceiv *nop = platform_get_drvdata(pdev);
f6d92a05	280
662dca54	281	usb_remove_phy(&nop->phy);
f6d92a05	282
f6d92a05 AKG	283	return 0;
	284	}
	285
0eba3879 RQ	286	static const struct of_device_id nop_xceiv_dt_ids[] = {
	287	{ .compatible = "usb-nop-xceiv" },
	288	{ }
	289	};
	290
	291	MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
	292
3fa4d734 SAS	293	static struct platform_driver usb_phy_gen_xceiv_driver = {
	294	.probe = usb_phy_gen_xceiv_probe,
	295	.remove = usb_phy_gen_xceiv_remove,
f6d92a05	296	.driver = {
3fa4d734	297	.name = "usb_phy_gen_xceiv",
f6d92a05	298	.owner = THIS_MODULE,
5462b0db	299	.of_match_table = nop_xceiv_dt_ids,
f6d92a05 AKG	300	},
	301	};
	302
3fa4d734	303	static int __init usb_phy_gen_xceiv_init(void)
f6d92a05	304	{
3fa4d734	305	return platform_driver_register(&usb_phy_gen_xceiv_driver);
f6d92a05	306	}
3fa4d734	307	subsys_initcall(usb_phy_gen_xceiv_init);
f6d92a05	308
3fa4d734	309	static void __exit usb_phy_gen_xceiv_exit(void)
f6d92a05	310	{
3fa4d734	311	platform_driver_unregister(&usb_phy_gen_xceiv_driver);
f6d92a05	312	}
3fa4d734	313	module_exit(usb_phy_gen_xceiv_exit);
f6d92a05	314
3fa4d734	315	MODULE_ALIAS("platform:usb_phy_gen_xceiv");
f6d92a05 AKG	316	MODULE_AUTHOR("Texas Instruments Inc");
	317	MODULE_DESCRIPTION("NOP USB Transceiver driver");
	318	MODULE_LICENSE("GPL");