[deliverable/linux.git] / drivers / usb / phy / phy-omap-control.c

/*
 * omap-control-usb.c - The USB part of control module.
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.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.
 *
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 *
 * 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/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/usb/omap_control_usb.h>

/**
 * omap_control_usb_phy_power - power on/off the phy using control module reg
 * @dev: the control module device
 * @on: 0 or 1, based on powering on or off the PHY
 */
void omap_control_usb_phy_power(struct device *dev, int on)
{
	u32 val;
	unsigned long rate;
	struct omap_control_usb	*control_usb;

	if (IS_ERR(dev) || !dev) {
		pr_err("%s: invalid device\n", __func__);
		return;
	}

	control_usb = dev_get_drvdata(dev);
	if (!control_usb) {
		dev_err(dev, "%s: invalid control usb device\n", __func__);
		return;
	}

	if (control_usb->type == OMAP_CTRL_TYPE_OTGHS)
		return;

	val = readl(control_usb->power);

	switch (control_usb->type) {
	case OMAP_CTRL_TYPE_USB2:
		if (on)
			val &= ~OMAP_CTRL_DEV_PHY_PD;
		else
			val |= OMAP_CTRL_DEV_PHY_PD;
		break;

	case OMAP_CTRL_TYPE_PIPE3:
		rate = clk_get_rate(control_usb->sys_clk);
		rate = rate/1000000;

		if (on) {
			val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK |
					OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK);
			val |= OMAP_CTRL_USB3_PHY_TX_RX_POWERON <<
				OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
			val |= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT;
		} else {
			val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK;
			val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<
				OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
		}
		break;

	case OMAP_CTRL_TYPE_DRA7USB2:
		if (on)
			val &= ~OMAP_CTRL_USB2_PHY_PD;
		else
			val |= OMAP_CTRL_USB2_PHY_PD;
		break;
	default:
		dev_err(dev, "%s: type %d not recognized\n",
					__func__, control_usb->type);
		break;
	}

	writel(val, control_usb->power);
}
EXPORT_SYMBOL_GPL(omap_control_usb_phy_power);

/**
 * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
 * @ctrl_usb: struct omap_control_usb *
 *
 * Writes to the mailbox register to notify the usb core that a usb
 * device has been connected.
 */
static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb)
{
	u32 val;

	val = readl(ctrl_usb->otghs_control);
	val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
	val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
	writel(val, ctrl_usb->otghs_control);
}

/**
 * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
 * impedance
 * @ctrl_usb: struct omap_control_usb *
 *
 * Writes to the mailbox register to notify the usb core that it has been
 * connected to a usb host.
 */
static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb)
{
	u32 val;

	val = readl(ctrl_usb->otghs_control);
	val &= ~OMAP_CTRL_DEV_SESSEND;
	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
		OMAP_CTRL_DEV_VBUSVALID;
	writel(val, ctrl_usb->otghs_control);
}

/**
 * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
 * impedance
 * @ctrl_usb: struct omap_control_usb *
 *
 * Writes to the mailbox register to notify the usb core it's now in
 * disconnected state.
 */
static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb)
{
	u32 val;

	val = readl(ctrl_usb->otghs_control);
	val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
	writel(val, ctrl_usb->otghs_control);
}

/**
 * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
 * or device mode or to denote disconnected state
 * @dev: the control module device
 * @mode: The mode to which usb should be configured
 *
 * This is an API to write to the mailbox register to notify the usb core that
 * a usb device has been connected.
 */
void omap_control_usb_set_mode(struct device *dev,
	enum omap_control_usb_mode mode)
{
	struct omap_control_usb	*ctrl_usb;

	if (IS_ERR(dev) || !dev)
		return;

	ctrl_usb = dev_get_drvdata(dev);

	if (!ctrl_usb) {
		dev_err(dev, "Invalid control usb device\n");
		return;
	}

	if (ctrl_usb->type != OMAP_CTRL_TYPE_OTGHS)
		return;

	switch (mode) {
	case USB_MODE_HOST:
		omap_control_usb_host_mode(ctrl_usb);
		break;
	case USB_MODE_DEVICE:
		omap_control_usb_device_mode(ctrl_usb);
		break;
	case USB_MODE_DISCONNECT:
		omap_control_usb_set_sessionend(ctrl_usb);
		break;
	default:
		dev_vdbg(dev, "invalid omap control usb mode\n");
	}
}
EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);

#ifdef CONFIG_OF

static const enum omap_control_usb_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
static const enum omap_control_usb_type usb2_data = OMAP_CTRL_TYPE_USB2;
static const enum omap_control_usb_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
static const enum omap_control_usb_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;

static const struct of_device_id omap_control_usb_id_table[] = {
	{
		.compatible = "ti,control-phy-otghs",
		.data = &otghs_data,
	},
	{
		.compatible = "ti,control-phy-usb2",
		.data = &usb2_data,
	},
	{
		.compatible = "ti,control-phy-pipe3",
		.data = &pipe3_data,
	},
	{
		.compatible = "ti,control-phy-dra7usb2",
		.data = &dra7usb2_data,
	},
	{},
};
MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
#endif


static int omap_control_usb_probe(struct platform_device *pdev)
{
	struct resource	*res;
	const struct of_device_id *of_id;
	struct omap_control_usb *control_usb;

	of_id = of_match_device(of_match_ptr(omap_control_usb_id_table),
								&pdev->dev);
	if (!of_id)
		return -EINVAL;

	control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb),
		GFP_KERNEL);
	if (!control_usb) {
		dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
		return -ENOMEM;
	}

	control_usb->dev = &pdev->dev;
	control_usb->type = *(enum omap_control_usb_type *)of_id->data;

	if (control_usb->type == OMAP_CTRL_TYPE_OTGHS) {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
			"otghs_control");
		control_usb->otghs_control = devm_ioremap_resource(
			&pdev->dev, res);
		if (IS_ERR(control_usb->otghs_control))
			return PTR_ERR(control_usb->otghs_control);
	} else {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
				"power");
		control_usb->power = devm_ioremap_resource(&pdev->dev, res);
		if (IS_ERR(control_usb->power)) {
			dev_err(&pdev->dev, "Couldn't get power register\n");
			return PTR_ERR(control_usb->power);
		}
	}

	if (control_usb->type == OMAP_CTRL_TYPE_PIPE3) {
		control_usb->sys_clk = devm_clk_get(control_usb->dev,
			"sys_clkin");
		if (IS_ERR(control_usb->sys_clk)) {
			pr_err("%s: unable to get sys_clkin\n", __func__);
			return -EINVAL;
		}
	}

	dev_set_drvdata(control_usb->dev, control_usb);

	return 0;
}

static struct platform_driver omap_control_usb_driver = {
	.probe		= omap_control_usb_probe,
	.driver		= {
		.name	= "omap-control-usb",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(omap_control_usb_id_table),
	},
};

static int __init omap_control_usb_init(void)
{
	return platform_driver_register(&omap_control_usb_driver);
}
subsys_initcall(omap_control_usb_init);

static void __exit omap_control_usb_exit(void)
{
	platform_driver_unregister(&omap_control_usb_driver);
}
module_exit(omap_control_usb_exit);

MODULE_ALIAS("platform: omap_control_usb");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("OMAP Control Module USB Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
01658f0f KVA	1	/*
	2	* omap-control-usb.c - The USB part of control module.
	3	*
	4	* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* Author: Kishon Vijay Abraham I <kishon@ti.com>
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/slab.h>
	22	#include <linux/of.h>
6cb9310a	23	#include <linux/of_device.h>
01658f0f KVA	24	#include <linux/err.h>
	25	#include <linux/io.h>
	26	#include <linux/clk.h>
	27	#include <linux/usb/omap_control_usb.h>
	28
01658f0f	29	/**
6cb9310a	30	* omap_control_usb_phy_power - power on/off the phy using control module reg
01658f0f	31	* @dev: the control module device
6cb9310a	32	* @on: 0 or 1, based on powering on or off the PHY
01658f0f	33	*/
6cb9310a	34	void omap_control_usb_phy_power(struct device *dev, int on)
01658f0f KVA	35	{
	36	u32 val;
	37	unsigned long rate;
6cb9310a	38	struct omap_control_usb *control_usb;
01658f0f	39
6cb9310a RQ	40	if (IS_ERR(dev) \|\| !dev) {
6cb9310a RQ	41	pr_err("%s: invalid device\n", __func__);
01658f0f	42	return;
6cb9310a	43	}
01658f0f	44
6cb9310a RQ	45	control_usb = dev_get_drvdata(dev);
	46	if (!control_usb) {
	47	dev_err(dev, "%s: invalid control usb device\n", __func__);
	48	return;
01658f0f KVA	49	}
01658f0f KVA	50
6cb9310a RQ	51	if (control_usb->type == OMAP_CTRL_TYPE_OTGHS)
6cb9310a RQ	52	return;
01658f0f	53
6cb9310a RQ	54	val = readl(control_usb->power);
	55
	56	switch (control_usb->type) {
	57	case OMAP_CTRL_TYPE_USB2:
	58	if (on)
	59	val &= ~OMAP_CTRL_DEV_PHY_PD;
	60	else
	61	val \|= OMAP_CTRL_DEV_PHY_PD;
	62	break;
01658f0f	63
6cb9310a RQ	64	case OMAP_CTRL_TYPE_PIPE3:
	65	rate = clk_get_rate(control_usb->sys_clk);
	66	rate = rate/1000000;
	67
	68	if (on) {
	69	val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK \|
	70	OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK);
	71	val \|= OMAP_CTRL_USB3_PHY_TX_RX_POWERON <<
	72	OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
	73	val \|= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT;
	74	} else {
	75	val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK;
	76	val \|= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<
	77	OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
	78	}
	79	break;
01658f0f	80
6cb9310a RQ	81	case OMAP_CTRL_TYPE_DRA7USB2:
	82	if (on)
	83	val &= ~OMAP_CTRL_USB2_PHY_PD;
	84	else
	85	val \|= OMAP_CTRL_USB2_PHY_PD;
	86	break;
	87	default:
	88	dev_err(dev, "%s: type %d not recognized\n",
	89	__func__, control_usb->type);
	90	break;
	91	}
01658f0f	92
6cb9310a	93	writel(val, control_usb->power);
01658f0f KVA	94	}
	95	EXPORT_SYMBOL_GPL(omap_control_usb_phy_power);
	96
	97	/**
	98	* omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
	99	* @ctrl_usb: struct omap_control_usb *
	100	*
	101	* Writes to the mailbox register to notify the usb core that a usb
	102	* device has been connected.
	103	*/
	104	static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb)
	105	{
	106	u32 val;
	107
	108	val = readl(ctrl_usb->otghs_control);
	109	val &= ~(OMAP_CTRL_DEV_IDDIG \| OMAP_CTRL_DEV_SESSEND);
	110	val \|= OMAP_CTRL_DEV_AVALID \| OMAP_CTRL_DEV_VBUSVALID;
	111	writel(val, ctrl_usb->otghs_control);
	112	}
	113
	114	/**
	115	* omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
	116	* impedance
	117	* @ctrl_usb: struct omap_control_usb *
	118	*
	119	* Writes to the mailbox register to notify the usb core that it has been
	120	* connected to a usb host.
	121	*/
	122	static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb)
	123	{
	124	u32 val;
	125
	126	val = readl(ctrl_usb->otghs_control);
	127	val &= ~OMAP_CTRL_DEV_SESSEND;
	128	val \|= OMAP_CTRL_DEV_IDDIG \| OMAP_CTRL_DEV_AVALID \|
	129	OMAP_CTRL_DEV_VBUSVALID;
	130	writel(val, ctrl_usb->otghs_control);
	131	}
	132
	133	/**
	134	* omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
	135	* impedance
	136	* @ctrl_usb: struct omap_control_usb *
	137	*
	138	* Writes to the mailbox register to notify the usb core it's now in
	139	* disconnected state.
	140	*/
	141	static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb)
	142	{
	143	u32 val;
	144
	145	val = readl(ctrl_usb->otghs_control);
	146	val &= ~(OMAP_CTRL_DEV_AVALID \| OMAP_CTRL_DEV_VBUSVALID);
	147	val \|= OMAP_CTRL_DEV_IDDIG \| OMAP_CTRL_DEV_SESSEND;
	148	writel(val, ctrl_usb->otghs_control);
	149	}
	150
	151	/**
	152	* omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
	153	* or device mode or to denote disconnected state
	154	* @dev: the control module device
	155	* @mode: The mode to which usb should be configured
	156	*
	157	* This is an API to write to the mailbox register to notify the usb core that
158	* a usb device has been connected.
159	*/
160	void omap_control_usb_set_mode(struct device *dev,
161	enum omap_control_usb_mode mode)
162	{
163	struct omap_control_usb *ctrl_usb;
164
0bb85dc2	165	if (IS_ERR(dev) \|\| !dev)
01658f0f KVA	166	return;
	167
	168	ctrl_usb = dev_get_drvdata(dev);
	169
0bb85dc2 RQ	170	if (!ctrl_usb) {
	171	dev_err(dev, "Invalid control usb device\n");
	172	return;
	173	}
	174
	175	if (ctrl_usb->type != OMAP_CTRL_TYPE_OTGHS)
	176	return;
	177
01658f0f KVA	178	switch (mode) {
	179	case USB_MODE_HOST:
	180	omap_control_usb_host_mode(ctrl_usb);
	181	break;
	182	case USB_MODE_DEVICE:
	183	omap_control_usb_device_mode(ctrl_usb);
	184	break;
	185	case USB_MODE_DISCONNECT:
	186	omap_control_usb_set_sessionend(ctrl_usb);
	187	break;
	188	default:
	189	dev_vdbg(dev, "invalid omap control usb mode\n");
	190	}
	191	}
	192	EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
	193
6cb9310a RQ	194	#ifdef CONFIG_OF
	195
	196	static const enum omap_control_usb_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
	197	static const enum omap_control_usb_type usb2_data = OMAP_CTRL_TYPE_USB2;
	198	static const enum omap_control_usb_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
	199	static const enum omap_control_usb_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;
	200
	201	static const struct of_device_id omap_control_usb_id_table[] = {
	202	{
	203	.compatible = "ti,control-phy-otghs",
	204	.data = &otghs_data,
	205	},
	206	{
	207	.compatible = "ti,control-phy-usb2",
	208	.data = &usb2_data,
	209	},
	210	{
	211	.compatible = "ti,control-phy-pipe3",
	212	.data = &pipe3_data,
	213	},
	214	{
	215	.compatible = "ti,control-phy-dra7usb2",
	216	.data = &dra7usb2_data,
	217	},
	218	{},
	219	};
	220	MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
	221	#endif
	222
	223
01658f0f KVA	224	static int omap_control_usb_probe(struct platform_device *pdev)
	225	{
	226	struct resource *res;
6cb9310a	227	const struct of_device_id *of_id;
0bb85dc2	228	struct omap_control_usb *control_usb;
6cb9310a RQ	229
	230	of_id = of_match_device(of_match_ptr(omap_control_usb_id_table),
	231	&pdev->dev);
	232	if (!of_id)
	233	return -EINVAL;
01658f0f KVA	234
	235	control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb),
	236	GFP_KERNEL);
	237	if (!control_usb) {
	238	dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
	239	return -ENOMEM;
	240	}
	241
6cb9310a RQ	242	control_usb->dev = &pdev->dev;
6cb9310a RQ	243	control_usb->type = (enum omap_control_usb_type )of_id->data;
01658f0f	244
6cb9310a	245	if (control_usb->type == OMAP_CTRL_TYPE_OTGHS) {
01658f0f KVA	246	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
01658f0f KVA	247	"otghs_control");
57ae575b	248	control_usb->otghs_control = devm_ioremap_resource(
01658f0f	249	&pdev->dev, res);
57ae575b SK	250	if (IS_ERR(control_usb->otghs_control))
57ae575b SK	251	return PTR_ERR(control_usb->otghs_control);
6cb9310a	252	} else {
01658f0f	253	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
6cb9310a RQ	254	"power");
	255	control_usb->power = devm_ioremap_resource(&pdev->dev, res);
	256	if (IS_ERR(control_usb->power)) {
	257	dev_err(&pdev->dev, "Couldn't get power register\n");
	258	return PTR_ERR(control_usb->power);
	259	}
	260	}
01658f0f	261
6cb9310a	262	if (control_usb->type == OMAP_CTRL_TYPE_PIPE3) {
01658f0f KVA	263	control_usb->sys_clk = devm_clk_get(control_usb->dev,
	264	"sys_clkin");
	265	if (IS_ERR(control_usb->sys_clk)) {
	266	pr_err("%s: unable to get sys_clkin\n", __func__);
	267	return -EINVAL;
	268	}
	269	}
	270
01658f0f KVA	271	dev_set_drvdata(control_usb->dev, control_usb);
	272
	273	return 0;
	274	}
	275
01658f0f KVA	276	static struct platform_driver omap_control_usb_driver = {
	277	.probe = omap_control_usb_probe,
	278	.driver = {
	279	.name = "omap-control-usb",
	280	.owner = THIS_MODULE,
	281	.of_match_table = of_match_ptr(omap_control_usb_id_table),
	282	},
	283	};
	284
	285	static int __init omap_control_usb_init(void)
	286	{
	287	return platform_driver_register(&omap_control_usb_driver);
	288	}
	289	subsys_initcall(omap_control_usb_init);
	290
	291	static void __exit omap_control_usb_exit(void)
	292	{
	293	platform_driver_unregister(&omap_control_usb_driver);
	294	}
	295	module_exit(omap_control_usb_exit);
	296
	297	MODULE_ALIAS("platform: omap_control_usb");
	298	MODULE_AUTHOR("Texas Instruments Inc.");
	299	MODULE_DESCRIPTION("OMAP Control Module USB Driver");
	300	MODULE_LICENSE("GPL v2");