drivers/usb/host/ehci-msm.c - kernel/msm - Gitiles

 /* ehci-msm.c - HSUSB Host Controller Driver Implementation
  *
  * Copyright (c) 2008-2013, The Linux Foundation. All rights reserved.
  *
  * Partly derived from ehci-fsl.c and ehci-hcd.c
  * Copyright (c) 2000-2004 by David Brownell
  * Copyright (c) 2005 MontaVista Software
  *
  * All source code in this file is licensed under the following license except
  * where indicated.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation.
  *
  * 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, you can find it at http://www.fsf.org
  */

 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/pm_runtime.h>

 #include <linux/usb/otg.h>
 #include <linux/usb/msm_hsusb.h>
 #include <linux/usb/msm_hsusb_hw.h>

 #define MSM_USB_BASE (hcd->regs)

 static struct usb_phy *phy;

 static int ehci_msm_reset(struct usb_hcd *hcd)
 {
 	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 	int retval;

 	ehci->caps = USB_CAPLENGTH;
 	hcd->has_tt = 1;

 	retval = ehci_setup(hcd);
 	if (retval)
 		return retval;

 	/* bursts of unspecified length. */
 	writel(0, USB_AHBBURST);
 	/* Use the AHB transactor */
 	writel_relaxed(0x08, USB_AHBMODE);
 	/* Disable streaming mode and select host mode */
 	writel_relaxed(0x13, USB_USBMODE);

 	if (ehci->transceiver->flags & ENABLE_SECONDARY_PHY) {
 		ehci_dbg(ehci, "using secondary hsphy\n");
 		writel_relaxed(readl_relaxed(USB_PHY_CTRL2) | (1<<16),
 							USB_PHY_CTRL2);
 	}

 	ehci_port_power(ehci, 1);
 	return 0;
 }

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

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

 	.reset			= ehci_msm_reset,
 	.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,
 	.endpoint_reset		= ehci_endpoint_reset,
 	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,

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

 	/*
 	 * root hub support
 	 */
 	.hub_status_data	= ehci_hub_status_data,
 	.hub_control		= ehci_hub_control,
 	.relinquish_port	= ehci_relinquish_port,
 	.port_handed_over	= ehci_port_handed_over,

 	/*
 	 * PM support
 	 */
 	.bus_suspend		= ehci_bus_suspend,
 	.bus_resume		= ehci_bus_resume,
 };

 static u64 msm_ehci_dma_mask = DMA_BIT_MASK(64);
 static int ehci_msm_probe(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd;
 	struct resource *res;
 	int ret;

 	dev_dbg(&pdev->dev, "ehci_msm proble\n");

 	if (!pdev->dev.dma_mask)
 		pdev->dev.dma_mask = &msm_ehci_dma_mask;
 	if (!pdev->dev.coherent_dma_mask)
 		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

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

 	hcd_to_bus(hcd)->skip_resume = true;

 	hcd->irq = platform_get_irq(pdev, 0);
 	if (hcd->irq < 0) {
 		dev_err(&pdev->dev, "Unable to get IRQ resource\n");
 		ret = hcd->irq;
 		goto put_hcd;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "Unable to get memory resource\n");
 		ret = -ENODEV;
 		goto put_hcd;
 	}

 	hcd->rsrc_start = res->start;
 	hcd->rsrc_len = resource_size(res);
 	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 	if (!hcd->regs) {
 		dev_err(&pdev->dev, "ioremap failed\n");
 		ret = -ENOMEM;
 		goto put_hcd;
 	}

 	/*
 	 * OTG driver takes care of PHY initialization, clock management,
 	 * powering up VBUS, mapping of registers address space and power
 	 * management.
 	 */
 	phy = usb_get_transceiver();
 	if (!phy) {
 		dev_err(&pdev->dev, "unable to find transceiver\n");
 		ret = -ENODEV;
 		goto unmap;
 	}

 	ret = otg_set_host(phy->otg, &hcd->self);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "unable to register with transceiver\n");
 		goto put_transceiver;
 	}

 	hcd_to_ehci(hcd)->transceiver = phy;
 	device_init_wakeup(&pdev->dev, 1);
 	pm_runtime_enable(&pdev->dev);

 	return 0;

 put_transceiver:
 	usb_put_transceiver(phy);
 unmap:
 	iounmap(hcd->regs);
 put_hcd:
 	usb_put_hcd(hcd);

 	return ret;
 }

 static int __devexit ehci_msm_remove(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);

 	device_init_wakeup(&pdev->dev, 0);
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_set_suspended(&pdev->dev);

 	hcd_to_ehci(hcd)->transceiver = NULL;
 	otg_set_host(phy->otg, NULL);
 	usb_put_transceiver(phy);

 	usb_put_hcd(hcd);

 	return 0;
 }

 #ifdef CONFIG_PM_RUNTIME
 static int ehci_msm_runtime_idle(struct device *dev)
 {
 	dev_dbg(dev, "ehci runtime idle\n");
 	return 0;
 }

 static int ehci_msm_runtime_suspend(struct device *dev)
 {
 	dev_dbg(dev, "ehci runtime suspend\n");
 	/*
 	 * Notify OTG about suspend.  It takes care of
 	 * putting the hardware in LPM.
 	 */
 	return usb_phy_set_suspend(phy, 1);
 }

 static int ehci_msm_runtime_resume(struct device *dev)
 {
 	dev_dbg(dev, "ehci runtime resume\n");
 	return usb_phy_set_suspend(phy, 0);
 }
 #endif

 #ifdef CONFIG_PM_SLEEP
 static int ehci_msm_pm_suspend(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	bool wakeup = device_may_wakeup(dev);

 	dev_dbg(dev, "ehci-msm PM suspend\n");

 	if (!hcd->rh_registered)
 		return 0;

 	/*
 	 * EHCI helper function has also the same check before manipulating
 	 * port wakeup flags.  We do check here the same condition before
 	 * calling the same helper function to avoid bringing hardware
 	 * from Low power mode when there is no need for adjusting port
 	 * wakeup flags.
 	 */
 	if (hcd->self.root_hub->do_remote_wakeup && !wakeup) {
 		pm_runtime_resume(dev);
 		ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
 				wakeup);
 	}

 	return usb_phy_set_suspend(phy, 1);
 }

 static int ehci_msm_pm_resume(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	int ret;

 	dev_dbg(dev, "ehci-msm PM resume\n");

 	if (!hcd->rh_registered)
 		return 0;

 	/* Notify OTG to bring hw out of LPM before restoring wakeup flags */
 	ret = usb_phy_set_suspend(phy, 0);
 	if (ret)
 		return ret;

 	ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
 	/* Resume root-hub to handle USB event if any else initiate LPM again */
 	usb_hcd_resume_root_hub(hcd);

 	return ret;
 }
 #endif

 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(ehci_msm_pm_suspend, ehci_msm_pm_resume)
 	SET_RUNTIME_PM_OPS(ehci_msm_runtime_suspend, ehci_msm_runtime_resume,
 				ehci_msm_runtime_idle)
 };

 static struct platform_driver ehci_msm_driver = {
 	.probe	= ehci_msm_probe,
 	.remove	= __devexit_p(ehci_msm_remove),
 	.driver = {
 		   .name = "msm_hsusb_host",
 		   .pm = &ehci_msm_dev_pm_ops,
 	},
 };
	/* ehci-msm.c - HSUSB Host Controller Driver Implementation
	*
	* Copyright (c) 2008-2013, The Linux Foundation. All rights reserved.
	*
	* Partly derived from ehci-fsl.c and ehci-hcd.c
	* Copyright (c) 2000-2004 by David Brownell
	* Copyright (c) 2005 MontaVista Software
	*
	* All source code in this file is licensed under the following license except
	* where indicated.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published
	* by the Free Software Foundation.
	*
	* 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, you can find it at http://www.fsf.org
	*/

	#include <linux/platform_device.h>
	#include <linux/clk.h>
	#include <linux/err.h>
	#include <linux/pm_runtime.h>

	#include <linux/usb/otg.h>
	#include <linux/usb/msm_hsusb.h>
	#include <linux/usb/msm_hsusb_hw.h>

	#define MSM_USB_BASE (hcd->regs)

	static struct usb_phy *phy;

	static int ehci_msm_reset(struct usb_hcd *hcd)
	{
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
	int retval;

	ehci->caps = USB_CAPLENGTH;
	hcd->has_tt = 1;

	retval = ehci_setup(hcd);
	if (retval)
	return retval;

	/* bursts of unspecified length. */
	writel(0, USB_AHBBURST);
	/* Use the AHB transactor */
	writel_relaxed(0x08, USB_AHBMODE);
	/* Disable streaming mode and select host mode */
	writel_relaxed(0x13, USB_USBMODE);

	if (ehci->transceiver->flags & ENABLE_SECONDARY_PHY) {
	ehci_dbg(ehci, "using secondary hsphy\n");
	writel_relaxed(readl_relaxed(USB_PHY_CTRL2) \| (1<<16),
	USB_PHY_CTRL2);
	}

	ehci_port_power(ehci, 1);
	return 0;
	}

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

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

	.reset = ehci_msm_reset,
	.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,
	.endpoint_reset = ehci_endpoint_reset,
	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,

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

	/*
	* root hub support
	*/
	.hub_status_data = ehci_hub_status_data,
	.hub_control = ehci_hub_control,
	.relinquish_port = ehci_relinquish_port,
	.port_handed_over = ehci_port_handed_over,

	/*
	* PM support
	*/
	.bus_suspend = ehci_bus_suspend,
	.bus_resume = ehci_bus_resume,
	};

	static u64 msm_ehci_dma_mask = DMA_BIT_MASK(64);
	static int ehci_msm_probe(struct platform_device *pdev)
	{
	struct usb_hcd *hcd;
	struct resource *res;
	int ret;

	dev_dbg(&pdev->dev, "ehci_msm proble\n");

	if (!pdev->dev.dma_mask)
	pdev->dev.dma_mask = &msm_ehci_dma_mask;
	if (!pdev->dev.coherent_dma_mask)
	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

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

	hcd_to_bus(hcd)->skip_resume = true;

	hcd->irq = platform_get_irq(pdev, 0);
	if (hcd->irq < 0) {
	dev_err(&pdev->dev, "Unable to get IRQ resource\n");
	ret = hcd->irq;
	goto put_hcd;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(&pdev->dev, "Unable to get memory resource\n");
	ret = -ENODEV;
	goto put_hcd;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
	dev_err(&pdev->dev, "ioremap failed\n");
	ret = -ENOMEM;
	goto put_hcd;
	}

	/*
	* OTG driver takes care of PHY initialization, clock management,
	* powering up VBUS, mapping of registers address space and power
	* management.
	*/
	phy = usb_get_transceiver();
	if (!phy) {
	dev_err(&pdev->dev, "unable to find transceiver\n");
	ret = -ENODEV;
	goto unmap;
	}

	ret = otg_set_host(phy->otg, &hcd->self);
	if (ret < 0) {
	dev_err(&pdev->dev, "unable to register with transceiver\n");
	goto put_transceiver;
	}

	hcd_to_ehci(hcd)->transceiver = phy;
	device_init_wakeup(&pdev->dev, 1);
	pm_runtime_enable(&pdev->dev);

	return 0;

	put_transceiver:
	usb_put_transceiver(phy);
	unmap:
	iounmap(hcd->regs);
	put_hcd:
	usb_put_hcd(hcd);

	return ret;
	}

	static int __devexit ehci_msm_remove(struct platform_device *pdev)
	{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	device_init_wakeup(&pdev->dev, 0);
	pm_runtime_disable(&pdev->dev);
	pm_runtime_set_suspended(&pdev->dev);

	hcd_to_ehci(hcd)->transceiver = NULL;
	otg_set_host(phy->otg, NULL);
	usb_put_transceiver(phy);

	usb_put_hcd(hcd);

	return 0;
	}

	#ifdef CONFIG_PM_RUNTIME
	static int ehci_msm_runtime_idle(struct device *dev)
	{
	dev_dbg(dev, "ehci runtime idle\n");
	return 0;
	}

	static int ehci_msm_runtime_suspend(struct device *dev)
	{
	dev_dbg(dev, "ehci runtime suspend\n");
	/*
	* Notify OTG about suspend. It takes care of
	* putting the hardware in LPM.
	*/
	return usb_phy_set_suspend(phy, 1);
	}

	static int ehci_msm_runtime_resume(struct device *dev)
	{
	dev_dbg(dev, "ehci runtime resume\n");
	return usb_phy_set_suspend(phy, 0);
	}
	#endif

	#ifdef CONFIG_PM_SLEEP
	static int ehci_msm_pm_suspend(struct device *dev)
	{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	bool wakeup = device_may_wakeup(dev);

	dev_dbg(dev, "ehci-msm PM suspend\n");

	if (!hcd->rh_registered)
	return 0;

	/*
	* EHCI helper function has also the same check before manipulating
	* port wakeup flags. We do check here the same condition before
	* calling the same helper function to avoid bringing hardware
	* from Low power mode when there is no need for adjusting port
	* wakeup flags.
	*/
	if (hcd->self.root_hub->do_remote_wakeup && !wakeup) {
	pm_runtime_resume(dev);
	ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
	wakeup);
	}

	return usb_phy_set_suspend(phy, 1);
	}

	static int ehci_msm_pm_resume(struct device *dev)
	{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	int ret;

	dev_dbg(dev, "ehci-msm PM resume\n");

	if (!hcd->rh_registered)
	return 0;

	/* Notify OTG to bring hw out of LPM before restoring wakeup flags */
	ret = usb_phy_set_suspend(phy, 0);
	if (ret)
	return ret;

	ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
	/* Resume root-hub to handle USB event if any else initiate LPM again */
	usb_hcd_resume_root_hub(hcd);

	return ret;
	}
	#endif

	static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(ehci_msm_pm_suspend, ehci_msm_pm_resume)
	SET_RUNTIME_PM_OPS(ehci_msm_runtime_suspend, ehci_msm_runtime_resume,
	ehci_msm_runtime_idle)
	};

	static struct platform_driver ehci_msm_driver = {
	.probe = ehci_msm_probe,
	.remove = __devexit_p(ehci_msm_remove),
	.driver = {
	.name = "msm_hsusb_host",
	.pm = &ehci_msm_dev_pm_ops,
	},
	};