drivers/usb/host/ehci-mxc.c - arm/linux-arm64-legacy - Git at Google

 /*
  * 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

 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);

 	hcd->has_tt = 1;

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

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

 	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() && !cpu_is_mx25()) {
 		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 up the PORTSCx register */
 	ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 	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",
 	},
 };
	/*
	* 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

	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);

	hcd->has_tt = 1;

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

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

	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() && !cpu_is_mx25()) {
	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 up the PORTSCx register */
	ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
	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",
	},
	};