[net-next-2.6.git] / drivers / usb / host / ehci-mxc.c

/*
 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 *
 * 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/platform_device.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/usb/otg.h>
#include <linux/slab.h>

#include <mach/mxc_ehci.h>

#define ULPI_VIEWPORT_OFFSET	0x170
#define PORTSC_OFFSET		0x184
#define USBMODE_OFFSET		0x1a8
#define USBMODE_CM_HOST		3

struct ehci_mxc_priv {
	struct clk *usbclk, *ahbclk;
	struct usb_hcd *hcd;
};

/* called during probe() after chip reset completes */
static int ehci_mxc_setup(struct usb_hcd *hcd)
{
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
	int retval;

	/* EHCI registers start at offset 0x100 */
	ehci->caps = hcd->regs + 0x100;
	ehci->regs = hcd->regs + 0x100 +
	    HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
	dbg_hcs_params(ehci, "reset");
	dbg_hcc_params(ehci, "reset");

	/* cache this readonly data; minimize chip reads */
	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);

	retval = ehci_halt(ehci);
	if (retval)
		return retval;

	/* data structure init */
	retval = ehci_init(hcd);
	if (retval)
		return retval;

	hcd->has_tt = 1;

	ehci->sbrn = 0x20;

	ehci_reset(ehci);

	ehci_port_power(ehci, 0);
	return 0;
}

static const struct hc_driver ehci_mxc_hc_driver = {
	.description = hcd_name,
	.product_desc = "Freescale On-Chip EHCI Host Controller",
	.hcd_priv_size = sizeof(struct ehci_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq = ehci_irq,
	.flags = HCD_USB2 | HCD_MEMORY,

	/*
	 * basic lifecycle operations
	 */
	.reset = ehci_mxc_setup,
	.start = ehci_run,
	.stop = ehci_stop,
	.shutdown = ehci_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue = ehci_urb_enqueue,
	.urb_dequeue = ehci_urb_dequeue,
	.endpoint_disable = ehci_endpoint_disable,

	/*
	 * scheduling support
	 */
	.get_frame_number = ehci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data = ehci_hub_status_data,
	.hub_control = ehci_hub_control,
	.bus_suspend = ehci_bus_suspend,
	.bus_resume = ehci_bus_resume,
	.relinquish_port = ehci_relinquish_port,
	.port_handed_over = ehci_port_handed_over,
};

static int ehci_mxc_drv_probe(struct platform_device *pdev)
{
	struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
	struct usb_hcd *hcd;
	struct resource *res;
	int irq, ret, temp;
	struct ehci_mxc_priv *priv;
	struct device *dev = &pdev->dev;

	dev_info(&pdev->dev, "initializing i.MX USB Controller\n");

	if (!pdata) {
		dev_err(dev, "No platform data given, bailing out.\n");
		return -EINVAL;
	}

	irq = platform_get_irq(pdev, 0);

	hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
	if (!hcd)
		return -ENOMEM;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		ret = -ENOMEM;
		goto err_alloc;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(dev, "Found HC with no register addr. Check setup!\n");
		ret = -ENODEV;
		goto err_get_resource;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		dev_dbg(dev, "controller already in use\n");
		ret = -EBUSY;
		goto err_request_mem;
	}

	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		dev_err(dev, "error mapping memory\n");
		ret = -EFAULT;
		goto err_ioremap;
	}

	/* call platform specific init function */
	if (pdata->init) {
		ret = pdata->init(pdev);
		if (ret) {
			dev_err(dev, "platform init failed\n");
			goto err_init;
		}
		/* platforms need some time to settle changed IO settings */
		mdelay(10);
	}

	/* enable clocks */
	priv->usbclk = clk_get(dev, "usb");
	if (IS_ERR(priv->usbclk)) {
		ret = PTR_ERR(priv->usbclk);
		goto err_clk;
	}
	clk_enable(priv->usbclk);

	if (!cpu_is_mx35()) {
		priv->ahbclk = clk_get(dev, "usb_ahb");
		if (IS_ERR(priv->ahbclk)) {
			ret = PTR_ERR(priv->ahbclk);
			goto err_clk_ahb;
		}
		clk_enable(priv->ahbclk);
	}

	/* set USBMODE to host mode */
	temp = readl(hcd->regs + USBMODE_OFFSET);
	writel(temp | USBMODE_CM_HOST, hcd->regs + USBMODE_OFFSET);

	/* set up the PORTSCx register */
	writel(pdata->portsc, hcd->regs + PORTSC_OFFSET);
	mdelay(10);

	/* setup specific usb hw */
	ret = mxc_initialize_usb_hw(pdev->id, pdata->flags);
	if (ret < 0)
		goto err_init;

	/* Initialize the transceiver */
	if (pdata->otg) {
		pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
		ret = otg_init(pdata->otg);
		if (ret) {
			dev_err(dev, "unable to init transceiver, probably missing\n");
			ret = -ENODEV;
			goto err_add;
		}
		ret = otg_set_vbus(pdata->otg, 1);
		if (ret) {
			dev_err(dev, "unable to enable vbus on transceiver\n");
			goto err_add;
		}
	}

	priv->hcd = hcd;
	platform_set_drvdata(pdev, priv);

	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
	if (ret)
		goto err_add;

	return 0;

err_add:
	if (pdata && pdata->exit)
		pdata->exit(pdev);
err_init:
	if (priv->ahbclk) {
		clk_disable(priv->ahbclk);
		clk_put(priv->ahbclk);
	}
err_clk_ahb:
	clk_disable(priv->usbclk);
	clk_put(priv->usbclk);
err_clk:
	iounmap(hcd->regs);
err_ioremap:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err_request_mem:
err_get_resource:
	kfree(priv);
err_alloc:
	usb_put_hcd(hcd);
	return ret;
}

static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
{
	struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
	struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = priv->hcd;

	if (pdata && pdata->exit)
		pdata->exit(pdev);

	if (pdata->otg)
		otg_shutdown(pdata->otg);

	usb_remove_hcd(hcd);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	platform_set_drvdata(pdev, NULL);

	clk_disable(priv->usbclk);
	clk_put(priv->usbclk);
	if (priv->ahbclk) {
		clk_disable(priv->ahbclk);
		clk_put(priv->ahbclk);
	}

	kfree(priv);

	return 0;
}

static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
{
	struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = priv->hcd;

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

MODULE_ALIAS("platform:mxc-ehci");

static struct platform_driver ehci_mxc_driver = {
	.probe = ehci_mxc_drv_probe,
	.remove = __exit_p(ehci_mxc_drv_remove),
	.shutdown = ehci_mxc_drv_shutdown,
	.driver = {
		   .name = "mxc-ehci",
	},
};
Commit	Line	Data
7e8d5cd9 DM	1	/*
	2	* Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
	3	* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation; either version 2 of the License, or (at your
	8	* option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	12	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	13	* for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software Foundation,
	17	* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*/
	19
	20	#include <linux/platform_device.h>
	21	#include <linux/clk.h>
	22	#include <linux/delay.h>
	23	#include <linux/usb/otg.h>
5a0e3ad6	24	#include <linux/slab.h>
7e8d5cd9 DM	25
	26	#include <mach/mxc_ehci.h>
	27
	28	#define ULPI_VIEWPORT_OFFSET 0x170
	29	#define PORTSC_OFFSET 0x184
	30	#define USBMODE_OFFSET 0x1a8
	31	#define USBMODE_CM_HOST 3
	32
	33	struct ehci_mxc_priv {
	34	struct clk usbclk, ahbclk;
	35	struct usb_hcd *hcd;
	36	};
	37
	38	/* called during probe() after chip reset completes */
	39	static int ehci_mxc_setup(struct usb_hcd *hcd)
	40	{
	41	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
	42	int retval;
	43
	44	/* EHCI registers start at offset 0x100 */
	45	ehci->caps = hcd->regs + 0x100;
	46	ehci->regs = hcd->regs + 0x100 +
	47	HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
	48	dbg_hcs_params(ehci, "reset");
	49	dbg_hcc_params(ehci, "reset");
	50
	51	/* cache this readonly data; minimize chip reads */
	52	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
	53
	54	retval = ehci_halt(ehci);
	55	if (retval)
	56	return retval;
	57
	58	/* data structure init */
	59	retval = ehci_init(hcd);
	60	if (retval)
	61	return retval;
	62
	63	hcd->has_tt = 1;
	64
	65	ehci->sbrn = 0x20;
	66
	67	ehci_reset(ehci);
	68
	69	ehci_port_power(ehci, 0);
	70	return 0;
	71	}
	72
	73	static const struct hc_driver ehci_mxc_hc_driver = {
	74	.description = hcd_name,
	75	.product_desc = "Freescale On-Chip EHCI Host Controller",
	76	.hcd_priv_size = sizeof(struct ehci_hcd),
	77
	78	/*
	79	* generic hardware linkage
	80	*/
	81	.irq = ehci_irq,
	82	.flags = HCD_USB2 \| HCD_MEMORY,
	83
	84	/*
	85	* basic lifecycle operations
	86	*/
	87	.reset = ehci_mxc_setup,
	88	.start = ehci_run,
89	.stop = ehci_stop,
90	.shutdown = ehci_shutdown,
91
92	/*
93	* managing i/o requests and associated device resources
94	*/
95	.urb_enqueue = ehci_urb_enqueue,
96	.urb_dequeue = ehci_urb_dequeue,
97	.endpoint_disable = ehci_endpoint_disable,
98
99	/*
100	* scheduling support
101	*/
102	.get_frame_number = ehci_get_frame,
103
104	/*
105	* root hub support
106	*/
107	.hub_status_data = ehci_hub_status_data,
108	.hub_control = ehci_hub_control,
109	.bus_suspend = ehci_bus_suspend,
110	.bus_resume = ehci_bus_resume,
111	.relinquish_port = ehci_relinquish_port,
112	.port_handed_over = ehci_port_handed_over,
113	};
114
115	static int ehci_mxc_drv_probe(struct platform_device *pdev)
116	{
117	struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
118	struct usb_hcd *hcd;
119	struct resource *res;
120	int irq, ret, temp;
121	struct ehci_mxc_priv *priv;
122	struct device *dev = &pdev->dev;
123
124	dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
125
126	if (!pdata) {
127	dev_err(dev, "No platform data given, bailing out.\n");
128	return -EINVAL;
129	}
130
131	irq = platform_get_irq(pdev, 0);
132
133	hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
134	if (!hcd)
135	return -ENOMEM;
136
137	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
138	if (!priv) {
139	ret = -ENOMEM;
140	goto err_alloc;
141	}
142
143	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144	if (!res) {
145	dev_err(dev, "Found HC with no register addr. Check setup!\n");
146	ret = -ENODEV;
147	goto err_get_resource;
148	}
149
150	hcd->rsrc_start = res->start;
151	hcd->rsrc_len = resource_size(res);
152
153	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
154	dev_dbg(dev, "controller already in use\n");
155	ret = -EBUSY;
156	goto err_request_mem;
157	}
158
159	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
160	if (!hcd->regs) {
161	dev_err(dev, "error mapping memory\n");
162	ret = -EFAULT;
163	goto err_ioremap;
164	}
165
2f0e40ab VL	166	/* call platform specific init function */
	167	if (pdata->init) {
	168	ret = pdata->init(pdev);
	169	if (ret) {
	170	dev_err(dev, "platform init failed\n");
	171	goto err_init;
	172	}
	173	/* platforms need some time to settle changed IO settings */
	174	mdelay(10);
	175	}
	176
7e8d5cd9 DM	177	/* enable clocks */
	178	priv->usbclk = clk_get(dev, "usb");
	179	if (IS_ERR(priv->usbclk)) {
	180	ret = PTR_ERR(priv->usbclk);
	181	goto err_clk;
	182	}
	183	clk_enable(priv->usbclk);
	184
	185	if (!cpu_is_mx35()) {
	186	priv->ahbclk = clk_get(dev, "usb_ahb");
	187	if (IS_ERR(priv->ahbclk)) {
	188	ret = PTR_ERR(priv->ahbclk);
	189	goto err_clk_ahb;
	190	}
	191	clk_enable(priv->ahbclk);
	192	}
	193
	194	/* set USBMODE to host mode */
	195	temp = readl(hcd->regs + USBMODE_OFFSET);
	196	writel(temp \| USBMODE_CM_HOST, hcd->regs + USBMODE_OFFSET);
	197
	198	/* set up the PORTSCx register */
	199	writel(pdata->portsc, hcd->regs + PORTSC_OFFSET);
	200	mdelay(10);
	201
5a25ad84 DN	202	/* setup specific usb hw */
5a25ad84 DN	203	ret = mxc_initialize_usb_hw(pdev->id, pdata->flags);
7e8d5cd9 DM	204	if (ret < 0)
	205	goto err_init;
	206
7e8d5cd9 DM	207	/* Initialize the transceiver */
	208	if (pdata->otg) {
	209	pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
4c9715de WS	210	ret = otg_init(pdata->otg);
	211	if (ret) {
	212	dev_err(dev, "unable to init transceiver, probably missing\n");
	213	ret = -ENODEV;
	214	goto err_add;
	215	}
	216	ret = otg_set_vbus(pdata->otg, 1);
	217	if (ret) {
7e8d5cd9	218	dev_err(dev, "unable to enable vbus on transceiver\n");
4c9715de WS	219	goto err_add;
4c9715de WS	220	}
7e8d5cd9 DM	221	}
	222
	223	priv->hcd = hcd;
	224	platform_set_drvdata(pdev, priv);
	225
	226	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED \| IRQF_SHARED);
	227	if (ret)
	228	goto err_add;
	229
	230	return 0;
	231
	232	err_add:
	233	if (pdata && pdata->exit)
	234	pdata->exit(pdev);
	235	err_init:
	236	if (priv->ahbclk) {
	237	clk_disable(priv->ahbclk);
	238	clk_put(priv->ahbclk);
	239	}
	240	err_clk_ahb:
	241	clk_disable(priv->usbclk);
	242	clk_put(priv->usbclk);
	243	err_clk:
	244	iounmap(hcd->regs);
	245	err_ioremap:
	246	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	247	err_request_mem:
	248	err_get_resource:
	249	kfree(priv);
	250	err_alloc:
	251	usb_put_hcd(hcd);
	252	return ret;
	253	}
	254
	255	static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
	256	{
	257	struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
	258	struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
	259	struct usb_hcd *hcd = priv->hcd;
	260
	261	if (pdata && pdata->exit)
	262	pdata->exit(pdev);
	263
	264	if (pdata->otg)
	265	otg_shutdown(pdata->otg);
	266
	267	usb_remove_hcd(hcd);
	268	iounmap(hcd->regs);
	269	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	270	usb_put_hcd(hcd);
	271	platform_set_drvdata(pdev, NULL);
	272
	273	clk_disable(priv->usbclk);
	274	clk_put(priv->usbclk);
	275	if (priv->ahbclk) {
	276	clk_disable(priv->ahbclk);
	277	clk_put(priv->ahbclk);
	278	}
	279
	280	kfree(priv);
	281
	282	return 0;
	283	}
	284
285	static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
286	{
287	struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
288	struct usb_hcd *hcd = priv->hcd;
289
290	if (hcd->driver->shutdown)
291	hcd->driver->shutdown(hcd);
292	}
293
294	MODULE_ALIAS("platform:mxc-ehci");
295
296	static struct platform_driver ehci_mxc_driver = {
297	.probe = ehci_mxc_drv_probe,
298	.remove = __exit_p(ehci_mxc_drv_remove),
299	.shutdown = ehci_mxc_drv_shutdown,
300	.driver = {
301	.name = "mxc-ehci",
302	},
303	};