[deliverable/linux.git] / drivers / usb / host / ohci-exynos.c

/*
 * SAMSUNG EXYNOS USB HOST OHCI Controller
 *
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Author: Jingoo Han <jg1.han@samsung.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.
 *
 */

#include <linux/clk.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/platform_data/usb-exynos.h>
#include <plat/usb-phy.h>

struct exynos_ohci_hcd {
	struct device *dev;
	struct usb_hcd *hcd;
	struct clk *clk;
};

static int ohci_exynos_reset(struct usb_hcd *hcd)
{
	return ohci_init(hcd_to_ohci(hcd));
}

static int ohci_exynos_start(struct usb_hcd *hcd)
{
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	int ret;

	ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);

	ret = ohci_run(ohci);
	if (ret < 0) {
		dev_err(hcd->self.controller, "can't start %s\n",
			hcd->self.bus_name);
		ohci_stop(hcd);
		return ret;
	}

	return 0;
}

static const struct hc_driver exynos_ohci_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "EXYNOS OHCI Host Controller",
	.hcd_priv_size		= sizeof(struct ohci_hcd),

	.irq			= ohci_irq,
	.flags			= HCD_MEMORY|HCD_USB11,

	.reset			= ohci_exynos_reset,
	.start			= ohci_exynos_start,
	.stop			= ohci_stop,
	.shutdown		= ohci_shutdown,

	.get_frame_number	= ohci_get_frame,

	.urb_enqueue		= ohci_urb_enqueue,
	.urb_dequeue		= ohci_urb_dequeue,
	.endpoint_disable	= ohci_endpoint_disable,

	.hub_status_data	= ohci_hub_status_data,
	.hub_control		= ohci_hub_control,
#ifdef	CONFIG_PM
	.bus_suspend		= ohci_bus_suspend,
	.bus_resume		= ohci_bus_resume,
#endif
	.start_port_reset	= ohci_start_port_reset,
};

static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);

static int __devinit exynos_ohci_probe(struct platform_device *pdev)
{
	struct exynos4_ohci_platdata *pdata;
	struct exynos_ohci_hcd *exynos_ohci;
	struct usb_hcd *hcd;
	struct ohci_hcd *ohci;
	struct resource *res;
	int irq;
	int err;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "No platform data defined\n");
		return -EINVAL;
	}

	/*
	 * Right now device-tree probed devices don't get dma_mask set.
	 * Since shared usb code relies on it, set it here for now.
	 * Once we move to full device tree support this will vanish off.
	 */
	if (!pdev->dev.dma_mask)
		pdev->dev.dma_mask = &ohci_exynos_dma_mask;
	if (!pdev->dev.coherent_dma_mask)
		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

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

	exynos_ohci->dev = &pdev->dev;

	hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
					dev_name(&pdev->dev));
	if (!hcd) {
		dev_err(&pdev->dev, "Unable to create HCD\n");
		return -ENOMEM;
	}

	exynos_ohci->hcd = hcd;
	exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");

	if (IS_ERR(exynos_ohci->clk)) {
		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
		err = PTR_ERR(exynos_ohci->clk);
		goto fail_clk;
	}

	err = clk_prepare_enable(exynos_ohci->clk);
	if (err)
		goto fail_clk;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Failed to get I/O memory\n");
		err = -ENXIO;
		goto fail_io;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
	if (!hcd->regs) {
		dev_err(&pdev->dev, "Failed to remap I/O memory\n");
		err = -ENOMEM;
		goto fail_io;
	}

	irq = platform_get_irq(pdev, 0);
	if (!irq) {
		dev_err(&pdev->dev, "Failed to get IRQ\n");
		err = -ENODEV;
		goto fail_io;
	}

	if (pdata->phy_init)
		pdata->phy_init(pdev, S5P_USB_PHY_HOST);

	ohci = hcd_to_ohci(hcd);
	ohci_hcd_init(ohci);

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err) {
		dev_err(&pdev->dev, "Failed to add USB HCD\n");
		goto fail_io;
	}

	platform_set_drvdata(pdev, exynos_ohci);

	return 0;

fail_io:
	clk_disable_unprepare(exynos_ohci->clk);
fail_clk:
	usb_put_hcd(hcd);
	return err;
}

static int __devexit exynos_ohci_remove(struct platform_device *pdev)
{
	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
	struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = exynos_ohci->hcd;

	usb_remove_hcd(hcd);

	if (pdata && pdata->phy_exit)
		pdata->phy_exit(pdev, S5P_USB_PHY_HOST);

	clk_disable_unprepare(exynos_ohci->clk);

	usb_put_hcd(hcd);

	return 0;
}

static void exynos_ohci_shutdown(struct platform_device *pdev)
{
	struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = exynos_ohci->hcd;

	if (hcd->driver->shutdown)
		hcd->driver->shutdown(hcd);
}

#ifdef CONFIG_PM
static int exynos_ohci_suspend(struct device *dev)
{
	struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
	struct usb_hcd *hcd = exynos_ohci->hcd;
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	struct platform_device *pdev = to_platform_device(dev);
	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
	unsigned long flags;
	int rc = 0;

	/*
	 * Root hub was already suspended. Disable irq emission and
	 * mark HW unaccessible, bail out if RH has been resumed. Use
	 * the spinlock to properly synchronize with possible pending
	 * RH suspend or resume activity.
	 */
	spin_lock_irqsave(&ohci->lock, flags);
	if (ohci->rh_state != OHCI_RH_SUSPENDED &&
			ohci->rh_state != OHCI_RH_HALTED) {
		rc = -EINVAL;
		goto fail;
	}

	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

	if (pdata && pdata->phy_exit)
		pdata->phy_exit(pdev, S5P_USB_PHY_HOST);

	clk_disable_unprepare(exynos_ohci->clk);

fail:
	spin_unlock_irqrestore(&ohci->lock, flags);

	return rc;
}

static int exynos_ohci_resume(struct device *dev)
{
	struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
	struct usb_hcd *hcd = exynos_ohci->hcd;
	struct platform_device *pdev = to_platform_device(dev);
	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;

	clk_prepare_enable(exynos_ohci->clk);

	if (pdata && pdata->phy_init)
		pdata->phy_init(pdev, S5P_USB_PHY_HOST);

	ohci_resume(hcd, false);

	return 0;
}
#else
#define exynos_ohci_suspend	NULL
#define exynos_ohci_resume	NULL
#endif

static const struct dev_pm_ops exynos_ohci_pm_ops = {
	.suspend	= exynos_ohci_suspend,
	.resume		= exynos_ohci_resume,
};

#ifdef CONFIG_OF
static const struct of_device_id exynos_ohci_match[] = {
	{ .compatible = "samsung,exynos-ohci" },
	{},
};
MODULE_DEVICE_TABLE(of, exynos_ohci_match);
#endif

static struct platform_driver exynos_ohci_driver = {
	.probe		= exynos_ohci_probe,
	.remove		= __devexit_p(exynos_ohci_remove),
	.shutdown	= exynos_ohci_shutdown,
	.driver = {
		.name	= "exynos-ohci",
		.owner	= THIS_MODULE,
		.pm	= &exynos_ohci_pm_ops,
		.of_match_table	= of_match_ptr(exynos_ohci_match),
	}
};

MODULE_ALIAS("platform:exynos-ohci");
MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
Commit	Line	Data
62194244 JH	1	/*
	2	* SAMSUNG EXYNOS USB HOST OHCI Controller
	3	*
	4	* Copyright (C) 2011 Samsung Electronics Co.Ltd
	5	* Author: Jingoo Han <jg1.han@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*
	12	*/
	13
	14	#include <linux/clk.h>
d5138930	15	#include <linux/of.h>
62194244	16	#include <linux/platform_device.h>
436d42c6	17	#include <linux/platform_data/usb-exynos.h>
62194244 JH	18	#include <plat/usb-phy.h>
	19
	20	struct exynos_ohci_hcd {
	21	struct device *dev;
	22	struct usb_hcd *hcd;
	23	struct clk *clk;
	24	};
	25
57465109 VP	26	static int ohci_exynos_reset(struct usb_hcd *hcd)
	27	{
	28	return ohci_init(hcd_to_ohci(hcd));
	29	}
	30
62194244 JH	31	static int ohci_exynos_start(struct usb_hcd *hcd)
	32	{
	33	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	34	int ret;
	35
	36	ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
	37
62194244 JH	38	ret = ohci_run(ohci);
62194244 JH	39	if (ret < 0) {
5e415245 GKH	40	dev_err(hcd->self.controller, "can't start %s\n",
5e415245 GKH	41	hcd->self.bus_name);
62194244 JH	42	ohci_stop(hcd);
	43	return ret;
	44	}
	45
	46	return 0;
	47	}
	48
	49	static const struct hc_driver exynos_ohci_hc_driver = {
	50	.description = hcd_name,
	51	.product_desc = "EXYNOS OHCI Host Controller",
	52	.hcd_priv_size = sizeof(struct ohci_hcd),
	53
	54	.irq = ohci_irq,
	55	.flags = HCD_MEMORY\|HCD_USB11,
	56
57465109	57	.reset = ohci_exynos_reset,
62194244 JH	58	.start = ohci_exynos_start,
	59	.stop = ohci_stop,
	60	.shutdown = ohci_shutdown,
	61
	62	.get_frame_number = ohci_get_frame,
	63
	64	.urb_enqueue = ohci_urb_enqueue,
	65	.urb_dequeue = ohci_urb_dequeue,
	66	.endpoint_disable = ohci_endpoint_disable,
	67
	68	.hub_status_data = ohci_hub_status_data,
	69	.hub_control = ohci_hub_control,
	70	#ifdef CONFIG_PM
	71	.bus_suspend = ohci_bus_suspend,
	72	.bus_resume = ohci_bus_resume,
	73	#endif
	74	.start_port_reset = ohci_start_port_reset,
	75	};
	76
d5138930 VG	77	static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
d5138930 VG	78
62194244 JH	79	static int __devinit exynos_ohci_probe(struct platform_device *pdev)
	80	{
	81	struct exynos4_ohci_platdata *pdata;
	82	struct exynos_ohci_hcd *exynos_ohci;
	83	struct usb_hcd *hcd;
	84	struct ohci_hcd *ohci;
	85	struct resource *res;
	86	int irq;
	87	int err;
	88
	89	pdata = pdev->dev.platform_data;
	90	if (!pdata) {
	91	dev_err(&pdev->dev, "No platform data defined\n");
	92	return -EINVAL;
	93	}
	94
d5138930 VG	95	/*
	96	* Right now device-tree probed devices don't get dma_mask set.
	97	* Since shared usb code relies on it, set it here for now.
	98	* Once we move to full device tree support this will vanish off.
	99	*/
	100	if (!pdev->dev.dma_mask)
	101	pdev->dev.dma_mask = &ohci_exynos_dma_mask;
	102	if (!pdev->dev.coherent_dma_mask)
	103	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
	104
390a0a78 JH	105	exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
390a0a78 JH	106	GFP_KERNEL);
62194244 JH	107	if (!exynos_ohci)
	108	return -ENOMEM;
	109
	110	exynos_ohci->dev = &pdev->dev;
	111
	112	hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
	113	dev_name(&pdev->dev));
	114	if (!hcd) {
	115	dev_err(&pdev->dev, "Unable to create HCD\n");
390a0a78	116	return -ENOMEM;
62194244 JH	117	}
	118
	119	exynos_ohci->hcd = hcd;
60d80adb	120	exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
62194244 JH	121
	122	if (IS_ERR(exynos_ohci->clk)) {
	123	dev_err(&pdev->dev, "Failed to get usbhost clock\n");
	124	err = PTR_ERR(exynos_ohci->clk);
	125	goto fail_clk;
	126	}
	127
c05c946c	128	err = clk_prepare_enable(exynos_ohci->clk);
62194244	129	if (err)
60d80adb	130	goto fail_clk;
62194244 JH	131
	132	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	133	if (!res) {
	134	dev_err(&pdev->dev, "Failed to get I/O memory\n");
	135	err = -ENXIO;
	136	goto fail_io;
	137	}
	138
	139	hcd->rsrc_start = res->start;
	140	hcd->rsrc_len = resource_size(res);
390a0a78	141	hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
62194244 JH	142	if (!hcd->regs) {
	143	dev_err(&pdev->dev, "Failed to remap I/O memory\n");
	144	err = -ENOMEM;
	145	goto fail_io;
	146	}
	147
	148	irq = platform_get_irq(pdev, 0);
	149	if (!irq) {
	150	dev_err(&pdev->dev, "Failed to get IRQ\n");
	151	err = -ENODEV;
390a0a78	152	goto fail_io;
62194244 JH	153	}
	154
	155	if (pdata->phy_init)
	156	pdata->phy_init(pdev, S5P_USB_PHY_HOST);
	157
	158	ohci = hcd_to_ohci(hcd);
	159	ohci_hcd_init(ohci);
	160
	161	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	162	if (err) {
	163	dev_err(&pdev->dev, "Failed to add USB HCD\n");
390a0a78	164	goto fail_io;
62194244 JH	165	}
	166
	167	platform_set_drvdata(pdev, exynos_ohci);
	168
	169	return 0;
	170
62194244	171	fail_io:
c05c946c	172	clk_disable_unprepare(exynos_ohci->clk);
62194244 JH	173	fail_clk:
62194244 JH	174	usb_put_hcd(hcd);
62194244 JH	175	return err;
	176	}
	177
	178	static int __devexit exynos_ohci_remove(struct platform_device *pdev)
	179	{
	180	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
	181	struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
	182	struct usb_hcd *hcd = exynos_ohci->hcd;
	183
	184	usb_remove_hcd(hcd);
	185
	186	if (pdata && pdata->phy_exit)
	187	pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
	188
c05c946c	189	clk_disable_unprepare(exynos_ohci->clk);
62194244 JH	190
62194244 JH	191	usb_put_hcd(hcd);
62194244 JH	192
	193	return 0;
	194	}
	195
	196	static void exynos_ohci_shutdown(struct platform_device *pdev)
	197	{
	198	struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
	199	struct usb_hcd *hcd = exynos_ohci->hcd;
	200
	201	if (hcd->driver->shutdown)
	202	hcd->driver->shutdown(hcd);
	203	}
	204
	205	#ifdef CONFIG_PM
	206	static int exynos_ohci_suspend(struct device *dev)
	207	{
	208	struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
	209	struct usb_hcd *hcd = exynos_ohci->hcd;
	210	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	211	struct platform_device *pdev = to_platform_device(dev);
	212	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
	213	unsigned long flags;
	214	int rc = 0;
	215
	216	/*
	217	* Root hub was already suspended. Disable irq emission and
	218	* mark HW unaccessible, bail out if RH has been resumed. Use
	219	* the spinlock to properly synchronize with possible pending
	220	* RH suspend or resume activity.
62194244 JH	221	*/
62194244 JH	222	spin_lock_irqsave(&ohci->lock, flags);
2b4ffe31 JH	223	if (ohci->rh_state != OHCI_RH_SUSPENDED &&
2b4ffe31 JH	224	ohci->rh_state != OHCI_RH_HALTED) {
62194244 JH	225	rc = -EINVAL;
	226	goto fail;
	227	}
	228
	229	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
	230
	231	if (pdata && pdata->phy_exit)
	232	pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
e864abed	233
c05c946c	234	clk_disable_unprepare(exynos_ohci->clk);
e864abed	235
62194244 JH	236	fail:
	237	spin_unlock_irqrestore(&ohci->lock, flags);
	238
	239	return rc;
	240	}
	241
	242	static int exynos_ohci_resume(struct device *dev)
	243	{
	244	struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
	245	struct usb_hcd *hcd = exynos_ohci->hcd;
	246	struct platform_device *pdev = to_platform_device(dev);
	247	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
	248
c05c946c	249	clk_prepare_enable(exynos_ohci->clk);
e864abed	250
62194244 JH	251	if (pdata && pdata->phy_init)
	252	pdata->phy_init(pdev, S5P_USB_PHY_HOST);
	253
cfa49b4b	254	ohci_resume(hcd, false);
62194244 JH	255
	256	return 0;
	257	}
	258	#else
	259	#define exynos_ohci_suspend NULL
	260	#define exynos_ohci_resume NULL
	261	#endif
	262
	263	static const struct dev_pm_ops exynos_ohci_pm_ops = {
	264	.suspend = exynos_ohci_suspend,
	265	.resume = exynos_ohci_resume,
	266	};
	267
d5138930 VG	268	#ifdef CONFIG_OF
	269	static const struct of_device_id exynos_ohci_match[] = {
	270	{ .compatible = "samsung,exynos-ohci" },
	271	{},
	272	};
	273	MODULE_DEVICE_TABLE(of, exynos_ohci_match);
	274	#endif
	275
62194244 JH	276	static struct platform_driver exynos_ohci_driver = {
	277	.probe = exynos_ohci_probe,
	278	.remove = __devexit_p(exynos_ohci_remove),
	279	.shutdown = exynos_ohci_shutdown,
	280	.driver = {
	281	.name = "exynos-ohci",
	282	.owner = THIS_MODULE,
	283	.pm = &exynos_ohci_pm_ops,
d5138930	284	.of_match_table = of_match_ptr(exynos_ohci_match),
62194244 JH	285	}
	286	};
	287
	288	MODULE_ALIAS("platform:exynos-ohci");
	289	MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");