[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / musb / ux500.c

/*
 * Copyright (C) 2010 ST-Ericsson AB
 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
 *
 * Based on omap2430.c
 *
 * 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/usb/musb-ux500.h>

#include "musb_core.h"

struct ux500_glue {
	struct device		*dev;
	struct platform_device	*musb;
	struct clk		*clk;
};
#define glue_to_musb(g)	platform_get_drvdata(g->musb)

static void ux500_musb_set_vbus(struct musb *musb, int is_on)
{
	u8            devctl;
	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
	/* HDRC controls CPEN, but beware current surges during device
	 * connect.  They can trigger transient overcurrent conditions
	 * that must be ignored.
	 */

	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

	if (is_on) {
		if (musb->xceiv->state == OTG_STATE_A_IDLE) {
			/* start the session */
			devctl |= MUSB_DEVCTL_SESSION;
			musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
			/*
			 * Wait for the musb to set as A device to enable the
			 * VBUS
			 */
			while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {

				if (time_after(jiffies, timeout)) {
					dev_err(musb->controller,
					"configured as A device timeout");
					break;
				}
			}

		} else {
			musb->is_active = 1;
			musb->xceiv->otg->default_a = 1;
			musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
			devctl |= MUSB_DEVCTL_SESSION;
			MUSB_HST_MODE(musb);
		}
	} else {
		musb->is_active = 0;

		/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
		 * right to B_IDLE...
		 */
		musb->xceiv->otg->default_a = 0;
		devctl &= ~MUSB_DEVCTL_SESSION;
		MUSB_DEV_MODE(musb);
	}
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

	/*
	 * Devctl values will be updated after vbus goes below
	 * session_valid. The time taken depends on the capacitance
	 * on VBUS line. The max discharge time can be upto 1 sec
	 * as per the spec. Typically on our platform, it is 200ms
	 */
	if (!is_on)
		mdelay(200);

	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
		usb_otg_state_string(musb->xceiv->state),
		musb_readb(musb->mregs, MUSB_DEVCTL));
}

static int musb_otg_notifications(struct notifier_block *nb,
		unsigned long event, void *unused)
{
	struct musb *musb = container_of(nb, struct musb, nb);

	dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
			event, usb_otg_state_string(musb->xceiv->state));

	switch (event) {
	case UX500_MUSB_ID:
		dev_dbg(musb->controller, "ID GND\n");
		ux500_musb_set_vbus(musb, 1);
		break;
	case UX500_MUSB_VBUS:
		dev_dbg(musb->controller, "VBUS Connect\n");
		break;
	case UX500_MUSB_NONE:
		dev_dbg(musb->controller, "VBUS Disconnect\n");
		if (is_host_active(musb))
			ux500_musb_set_vbus(musb, 0);
		else
			musb->xceiv->state = OTG_STATE_B_IDLE;
		break;
	default:
		dev_dbg(musb->controller, "ID float\n");
		return NOTIFY_DONE;
	}
	return NOTIFY_OK;
}

static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
{
	unsigned long   flags;
	irqreturn_t     retval = IRQ_NONE;
	struct musb     *musb = __hci;

	spin_lock_irqsave(&musb->lock, flags);

	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);

	if (musb->int_usb || musb->int_tx || musb->int_rx)
		retval = musb_interrupt(musb);

	spin_unlock_irqrestore(&musb->lock, flags);

	return retval;
}

static int ux500_musb_init(struct musb *musb)
{
	int status;

	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
	if (IS_ERR_OR_NULL(musb->xceiv)) {
		pr_err("HS USB OTG: no transceiver configured\n");
		return -EPROBE_DEFER;
	}

	musb->nb.notifier_call = musb_otg_notifications;
	status = usb_register_notifier(musb->xceiv, &musb->nb);
	if (status < 0) {
		dev_dbg(musb->controller, "notification register failed\n");
		return status;
	}

	musb->isr = ux500_musb_interrupt;

	return 0;
}

static int ux500_musb_exit(struct musb *musb)
{
	usb_unregister_notifier(musb->xceiv, &musb->nb);

	usb_put_phy(musb->xceiv);

	return 0;
}

static const struct musb_platform_ops ux500_ops = {
	.init		= ux500_musb_init,
	.exit		= ux500_musb_exit,

	.set_vbus	= ux500_musb_set_vbus,
};

static int ux500_probe(struct platform_device *pdev)
{
	struct musb_hdrc_platform_data	*pdata = pdev->dev.platform_data;
	struct platform_device		*musb;
	struct ux500_glue		*glue;
	struct clk			*clk;
	int				ret = -ENOMEM;

	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
	if (!glue) {
		dev_err(&pdev->dev, "failed to allocate glue context\n");
		goto err0;
	}

	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
	if (!musb) {
		dev_err(&pdev->dev, "failed to allocate musb device\n");
		goto err1;
	}

	clk = clk_get(&pdev->dev, "usb");
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		ret = PTR_ERR(clk);
		goto err3;
	}

	ret = clk_prepare_enable(clk);
	if (ret) {
		dev_err(&pdev->dev, "failed to enable clock\n");
		goto err4;
	}

	musb->dev.parent		= &pdev->dev;
	musb->dev.dma_mask		= pdev->dev.dma_mask;
	musb->dev.coherent_dma_mask	= pdev->dev.coherent_dma_mask;

	glue->dev			= &pdev->dev;
	glue->musb			= musb;
	glue->clk			= clk;

	pdata->platform_ops		= &ux500_ops;

	platform_set_drvdata(pdev, glue);

	ret = platform_device_add_resources(musb, pdev->resource,
			pdev->num_resources);
	if (ret) {
		dev_err(&pdev->dev, "failed to add resources\n");
		goto err5;
	}

	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	if (ret) {
		dev_err(&pdev->dev, "failed to add platform_data\n");
		goto err5;
	}

	ret = platform_device_add(musb);
	if (ret) {
		dev_err(&pdev->dev, "failed to register musb device\n");
		goto err5;
	}

	return 0;

err5:
	clk_disable_unprepare(clk);

err4:
	clk_put(clk);

err3:
	platform_device_put(musb);

err1:
	kfree(glue);

err0:
	return ret;
}

static int ux500_remove(struct platform_device *pdev)
{
	struct ux500_glue	*glue = platform_get_drvdata(pdev);

	platform_device_unregister(glue->musb);
	clk_disable_unprepare(glue->clk);
	clk_put(glue->clk);
	kfree(glue);

	return 0;
}

#ifdef CONFIG_PM
static int ux500_suspend(struct device *dev)
{
	struct ux500_glue	*glue = dev_get_drvdata(dev);
	struct musb		*musb = glue_to_musb(glue);

	usb_phy_set_suspend(musb->xceiv, 1);
	clk_disable_unprepare(glue->clk);

	return 0;
}

static int ux500_resume(struct device *dev)
{
	struct ux500_glue	*glue = dev_get_drvdata(dev);
	struct musb		*musb = glue_to_musb(glue);
	int			ret;

	ret = clk_prepare_enable(glue->clk);
	if (ret) {
		dev_err(dev, "failed to enable clock\n");
		return ret;
	}

	usb_phy_set_suspend(musb->xceiv, 0);

	return 0;
}

static const struct dev_pm_ops ux500_pm_ops = {
	.suspend	= ux500_suspend,
	.resume		= ux500_resume,
};

#define DEV_PM_OPS	(&ux500_pm_ops)
#else
#define DEV_PM_OPS	NULL
#endif

static struct platform_driver ux500_driver = {
	.probe		= ux500_probe,
	.remove		= ux500_remove,
	.driver		= {
		.name	= "musb-ux500",
		.pm	= DEV_PM_OPS,
	},
};

MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
MODULE_LICENSE("GPL v2");
module_platform_driver(ux500_driver);
Commit	Line	Data
4bc36fd3 MYK	1	/*
	2	* Copyright (C) 2010 ST-Ericsson AB
	3	* Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
	4	*
	5	* Based on omap2430.c
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	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	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/kernel.h>
	24	#include <linux/init.h>
	25	#include <linux/clk.h>
ded017ee	26	#include <linux/err.h>
4bc36fd3 MYK	27	#include <linux/io.h>
4bc36fd3 MYK	28	#include <linux/platform_device.h>
af6882be	29	#include <linux/usb/musb-ux500.h>
4bc36fd3 MYK	30
	31	#include "musb_core.h"
	32
	33	struct ux500_glue {
	34	struct device *dev;
	35	struct platform_device *musb;
	36	struct clk *clk;
	37	};
	38	#define glue_to_musb(g) platform_get_drvdata(g->musb)
	39
996a9d26 FB	40	static void ux500_musb_set_vbus(struct musb *musb, int is_on)
	41	{
	42	u8 devctl;
	43	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
	44	/* HDRC controls CPEN, but beware current surges during device
	45	* connect. They can trigger transient overcurrent conditions
	46	* that must be ignored.
	47	*/
	48
	49	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
	50
	51	if (is_on) {
	52	if (musb->xceiv->state == OTG_STATE_A_IDLE) {
	53	/* start the session */
	54	devctl \|= MUSB_DEVCTL_SESSION;
	55	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
	56	/*
	57	* Wait for the musb to set as A device to enable the
	58	* VBUS
	59	*/
	60	while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
	61
	62	if (time_after(jiffies, timeout)) {
	63	dev_err(musb->controller,
	64	"configured as A device timeout");
	65	break;
	66	}
	67	}
	68
	69	} else {
	70	musb->is_active = 1;
	71	musb->xceiv->otg->default_a = 1;
	72	musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
	73	devctl \|= MUSB_DEVCTL_SESSION;
	74	MUSB_HST_MODE(musb);
	75	}
	76	} else {
	77	musb->is_active = 0;
	78
	79	/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
	80	* right to B_IDLE...
	81	*/
	82	musb->xceiv->otg->default_a = 0;
	83	devctl &= ~MUSB_DEVCTL_SESSION;
	84	MUSB_DEV_MODE(musb);
	85	}
	86	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
	87
	88	/*
	89	* Devctl values will be updated after vbus goes below
	90	* session_valid. The time taken depends on the capacitance
	91	* on VBUS line. The max discharge time can be upto 1 sec
	92	* as per the spec. Typically on our platform, it is 200ms
	93	*/
	94	if (!is_on)
	95	mdelay(200);
	96
	97	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
	98	usb_otg_state_string(musb->xceiv->state),
	99	musb_readb(musb->mregs, MUSB_DEVCTL));
	100	}
	101
0135522c FB	102	static int musb_otg_notifications(struct notifier_block *nb,
	103	unsigned long event, void *unused)
	104	{
	105	struct musb *musb = container_of(nb, struct musb, nb);
	106
	107	dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
	108	event, usb_otg_state_string(musb->xceiv->state));
	109
	110	switch (event) {
af6882be	111	case UX500_MUSB_ID:
0135522c FB	112	dev_dbg(musb->controller, "ID GND\n");
	113	ux500_musb_set_vbus(musb, 1);
	114	break;
af6882be	115	case UX500_MUSB_VBUS:
0135522c	116	dev_dbg(musb->controller, "VBUS Connect\n");
0135522c	117	break;
af6882be	118	case UX500_MUSB_NONE:
0135522c FB	119	dev_dbg(musb->controller, "VBUS Disconnect\n");
	120	if (is_host_active(musb))
	121	ux500_musb_set_vbus(musb, 0);
	122	else
	123	musb->xceiv->state = OTG_STATE_B_IDLE;
	124	break;
	125	default:
	126	dev_dbg(musb->controller, "ID float\n");
	127	return NOTIFY_DONE;
	128	}
	129	return NOTIFY_OK;
	130	}
	131
baef653a PDS	132	static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
	133	{
	134	unsigned long flags;
	135	irqreturn_t retval = IRQ_NONE;
	136	struct musb *musb = __hci;
	137
	138	spin_lock_irqsave(&musb->lock, flags);
	139
	140	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
	141	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
	142	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
	143
	144	if (musb->int_usb \|\| musb->int_tx \|\| musb->int_rx)
	145	retval = musb_interrupt(musb);
	146
	147	spin_unlock_irqrestore(&musb->lock, flags);
	148
	149	return retval;
	150	}
	151
4bc36fd3 MYK	152	static int ux500_musb_init(struct musb *musb)
4bc36fd3 MYK	153	{
0135522c FB	154	int status;
0135522c FB	155
662dca54	156	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
ded017ee	157	if (IS_ERR_OR_NULL(musb->xceiv)) {
4bc36fd3	158	pr_err("HS USB OTG: no transceiver configured\n");
25736e0c	159	return -EPROBE_DEFER;
4bc36fd3 MYK	160	}
4bc36fd3 MYK	161
0135522c FB	162	musb->nb.notifier_call = musb_otg_notifications;
	163	status = usb_register_notifier(musb->xceiv, &musb->nb);
	164	if (status < 0) {
	165	dev_dbg(musb->controller, "notification register failed\n");
	166	return status;
	167	}
	168
baef653a PDS	169	musb->isr = ux500_musb_interrupt;
baef653a PDS	170
4bc36fd3 MYK	171	return 0;
	172	}
	173
	174	static int ux500_musb_exit(struct musb *musb)
	175	{
0135522c FB	176	usb_unregister_notifier(musb->xceiv, &musb->nb);
0135522c FB	177
721002ec	178	usb_put_phy(musb->xceiv);
4bc36fd3 MYK	179
	180	return 0;
	181	}
	182
	183	static const struct musb_platform_ops ux500_ops = {
	184	.init = ux500_musb_init,
	185	.exit = ux500_musb_exit,
996a9d26 FB	186
996a9d26 FB	187	.set_vbus = ux500_musb_set_vbus,
4bc36fd3 MYK	188	};
4bc36fd3 MYK	189
41ac7b3a	190	static int ux500_probe(struct platform_device *pdev)
4bc36fd3 MYK	191	{
	192	struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
	193	struct platform_device *musb;
	194	struct ux500_glue *glue;
	195	struct clk *clk;
4bc36fd3 MYK	196	int ret = -ENOMEM;
	197
	198	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
	199	if (!glue) {
	200	dev_err(&pdev->dev, "failed to allocate glue context\n");
	201	goto err0;
	202	}
	203
2f771164	204	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
4bc36fd3 MYK	205	if (!musb) {
4bc36fd3 MYK	206	dev_err(&pdev->dev, "failed to allocate musb device\n");
2f771164	207	goto err1;
4bc36fd3 MYK	208	}
	209
	210	clk = clk_get(&pdev->dev, "usb");
	211	if (IS_ERR(clk)) {
	212	dev_err(&pdev->dev, "failed to get clock\n");
	213	ret = PTR_ERR(clk);
65b3d52d	214	goto err3;
4bc36fd3 MYK	215	}
4bc36fd3 MYK	216
99d17cfa	217	ret = clk_prepare_enable(clk);
4bc36fd3 MYK	218	if (ret) {
4bc36fd3 MYK	219	dev_err(&pdev->dev, "failed to enable clock\n");
65b3d52d	220	goto err4;
4bc36fd3 MYK	221	}
	222
	223	musb->dev.parent = &pdev->dev;
87266064 MYK	224	musb->dev.dma_mask = pdev->dev.dma_mask;
87266064 MYK	225	musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
4bc36fd3 MYK	226
	227	glue->dev = &pdev->dev;
	228	glue->musb = musb;
	229	glue->clk = clk;
	230
	231	pdata->platform_ops = &ux500_ops;
	232
	233	platform_set_drvdata(pdev, glue);
	234
	235	ret = platform_device_add_resources(musb, pdev->resource,
	236	pdev->num_resources);
	237	if (ret) {
	238	dev_err(&pdev->dev, "failed to add resources\n");
65b3d52d	239	goto err5;
4bc36fd3 MYK	240	}
	241
	242	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	243	if (ret) {
	244	dev_err(&pdev->dev, "failed to add platform_data\n");
65b3d52d	245	goto err5;
4bc36fd3 MYK	246	}
	247
	248	ret = platform_device_add(musb);
	249	if (ret) {
	250	dev_err(&pdev->dev, "failed to register musb device\n");
65b3d52d	251	goto err5;
4bc36fd3 MYK	252	}
	253
	254	return 0;
	255
65b3d52d	256	err5:
99d17cfa	257	clk_disable_unprepare(clk);
4bc36fd3	258
65b3d52d	259	err4:
4bc36fd3 MYK	260	clk_put(clk);
4bc36fd3 MYK	261
65b3d52d	262	err3:
4bc36fd3 MYK	263	platform_device_put(musb);
	264
	265	err1:
	266	kfree(glue);
	267
	268	err0:
	269	return ret;
	270	}
	271
fb4e98ab	272	static int ux500_remove(struct platform_device *pdev)
4bc36fd3 MYK	273	{
	274	struct ux500_glue *glue = platform_get_drvdata(pdev);
	275
4b0de6f3	276	platform_device_unregister(glue->musb);
99d17cfa	277	clk_disable_unprepare(glue->clk);
4bc36fd3 MYK	278	clk_put(glue->clk);
	279	kfree(glue);
	280
	281	return 0;
	282	}
	283
	284	#ifdef CONFIG_PM
	285	static int ux500_suspend(struct device *dev)
	286	{
	287	struct ux500_glue *glue = dev_get_drvdata(dev);
	288	struct musb *musb = glue_to_musb(glue);
	289
b96d3b08	290	usb_phy_set_suspend(musb->xceiv, 1);
99d17cfa	291	clk_disable_unprepare(glue->clk);
4bc36fd3 MYK	292
	293	return 0;
	294	}
	295
	296	static int ux500_resume(struct device *dev)
	297	{
	298	struct ux500_glue *glue = dev_get_drvdata(dev);
	299	struct musb *musb = glue_to_musb(glue);
	300	int ret;
	301
99d17cfa	302	ret = clk_prepare_enable(glue->clk);
4bc36fd3 MYK	303	if (ret) {
	304	dev_err(dev, "failed to enable clock\n");
	305	return ret;
	306	}
	307
b96d3b08	308	usb_phy_set_suspend(musb->xceiv, 0);
4bc36fd3 MYK	309
	310	return 0;
	311	}
	312
	313	static const struct dev_pm_ops ux500_pm_ops = {
	314	.suspend = ux500_suspend,
	315	.resume = ux500_resume,
	316	};
	317
	318	#define DEV_PM_OPS (&ux500_pm_ops)
	319	#else
	320	#define DEV_PM_OPS NULL
	321	#endif
	322
	323	static struct platform_driver ux500_driver = {
e9e8c85e	324	.probe = ux500_probe,
7690417d	325	.remove = ux500_remove,
4bc36fd3 MYK	326	.driver = {
	327	.name = "musb-ux500",
	328	.pm = DEV_PM_OPS,
	329	},
	330	};
	331
	332	MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
	333	MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
	334	MODULE_LICENSE("GPL v2");
0e7090a6	335	module_platform_driver(ux500_driver);