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Commit ed069e65 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti Committed by Gerrit - the friendly Code Review server
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USB: EHCI: Add MSM Host Controller driver 



This patch adds the support for EHCI compliant HSUSB Host controller found
on MSM chips.  The root hub has a single port and TT is built into it.
This driver depends on OTG driver for PHY initialization, clock
management and powering up VBUS.
This snapshot is taken as of msm-4.14 'commit 86918472c0fd
("ARM: dts: msm: support A/B OTA for LW.2.0")'.

Change-Id: Ia26d85dbf2217d3284660d5cf5cce68fdac274d3
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: default avatarSwetha Chikkaboraiah <schikk@codeaurora.org>
parent 502f6541

drivers/usb/host/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -782,6 +782,18 @@ config USB_HCD_SSB 


	  If unsure, say N.



config USB_EHCI_MSM

	tristate "Support for Qualcomm Technologies, Inc. QSD/MSM on-chip EHCI USB controller"

	depends on ARCH_QCOM

	select USB_EHCI_ROOT_HUB_TT

	help

	  Enables support for the USB Host controller present on the

	  Qualcomm Technologies, Inc. chipsets. Root Hub has inbuilt TT.

	  This driver depends on OTG driver for PHY initialization,

	  clock management, powering up VBUS, and power management.

	  This driver is not supported on boards like trout which

	  has an external PHY.



config USB_HCD_TEST_MODE

	bool "HCD test mode support"

	---help---

drivers/usb/host/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ obj-$(CONFIG_USB_EHCI_HCD_SPEAR) += ehci-spear.o 
obj-$(CONFIG_USB_EHCI_HCD_STI)	+= ehci-st.o

obj-$(CONFIG_USB_EHCI_EXYNOS)	+= ehci-exynos.o

obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o

obj-$(CONFIG_USB_EHCI_MSM)      += ehci-msm.o

obj-$(CONFIG_USB_EHCI_TEGRA)	+= ehci-tegra.o

obj-$(CONFIG_USB_W90X900_EHCI)	+= ehci-w90x900.o

drivers/usb/host/ehci-msm.c

0 → 100644
+268 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * EHCI HSUSB Host Controller Driver Implementation

 *

 * Copyright (c) 2008-2011, 2021, 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/clk.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/usb/otg.h>

#include <linux/usb/msm_hsusb_hw.h>

#include <linux/usb.h>

#include <linux/usb/hcd.h>

#include <linux/acpi.h>



#include "ehci.h"



#define MSM_USB_BASE (hcd->regs)



#define DRIVER_DESC "Qualcomm Technologies, Inc. On-Chip EHCI Host Controller"



static const char hcd_name[] = "ehci-msm";

static struct hc_driver __read_mostly msm_hc_driver;



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;



	/* select ULPI phy and clear other status/control bits in PORTSC */

	writel_relaxed(PORTSC_PTS_ULPI, USB_PORTSC);

	/* bursts of unspecified length. */

	writel_relaxed(0, USB_AHBBURST);

	/* Use the AHB transactor, allow posted data writes */

	writel_relaxed(0x8, USB_AHBMODE);

	/* Disable streaming mode and select host mode */

	writel_relaxed(0x13, USB_USBMODE);

	/* Disable ULPI_TX_PKT_EN_CLR_FIX which is valid only for HSIC */

	writel_relaxed(readl_relaxed(USB_GENCONFIG_2) & ~ULPI_TX_PKT_EN_CLR_FIX,

				USB_GENCONFIG_2);



	return 0;

}



static int ehci_msm_probe(struct platform_device *pdev)

{

	struct usb_hcd *hcd;

	struct resource *res;

	struct usb_phy *phy;

	int ret;



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



	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;

	}



	ret = platform_get_irq(pdev, 0);

	if (ret < 0) {

		dev_err(&pdev->dev, "Unable to get IRQ resource\n");

		goto put_hcd;

	}

	hcd->irq = ret;



	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 = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);

	if (!hcd->regs) {

		dev_err(&pdev->dev, "ioremap failed\n");

		ret = -ENOMEM;

		goto put_hcd;

	}



	/*

	 * If there is an OTG driver, let it take care of PHY initialization,

	 * clock management, powering up VBUS, mapping of registers address

	 * space and power management.

	 */

	if (pdev->dev.of_node)

		phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);

	else

		phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);



	if (IS_ERR(phy)) {

		if (PTR_ERR(phy) == -EPROBE_DEFER) {

			dev_err(&pdev->dev, "unable to find transceiver\n");

			ret = -EPROBE_DEFER;

			goto put_hcd;

		}

		phy = NULL;

	}



	hcd->usb_phy = phy;

	device_init_wakeup(&pdev->dev, 1);



	if (phy && phy->otg) {

		/*

		 * MSM OTG driver takes care of adding the HCD and

		 * placing hardware into low power mode via runtime PM.

		 */

		ret = otg_set_host(phy->otg, &hcd->self);

		if (ret < 0) {

			dev_err(&pdev->dev, "unable to register with transceiver\n");

			goto put_hcd;

		}



		pm_runtime_no_callbacks(&pdev->dev);

		pm_runtime_enable(&pdev->dev);

	} else {

		ret = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);

		if (ret)

			goto put_hcd;

	}



	return 0;



put_hcd:

	usb_put_hcd(hcd);



	return ret;

}



static int 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);



	if (hcd->usb_phy && hcd->usb_phy->otg)

		otg_set_host(hcd->usb_phy->otg, NULL);

	else

		usb_remove_hcd(hcd);



	usb_put_hcd(hcd);



	return 0;

}



#ifdef CONFIG_PM

static int ehci_msm_runtime_suspend(struct device *dev)

{

	struct usb_hcd *hcd = dev_get_drvdata(dev);

	struct ehci_hcd *ehci = hcd_to_ehci(hcd);

	bool do_wakeup = device_may_wakeup(dev);



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



	/* Only call ehci_suspend if ehci_setup has been done */

	if (ehci->sbrn)

		return ehci_suspend(hcd, do_wakeup);



	return 0;

}



static int ehci_msm_runtime_resume(struct device *dev)

{

	struct usb_hcd *hcd = dev_get_drvdata(dev);

	struct ehci_hcd *ehci = hcd_to_ehci(hcd);



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



	/* Only call ehci_resume if ehci_setup has been done */

	if (ehci->sbrn)

		ehci_resume(hcd, false);



	return 0;

}



#else

#define ehci_msm_pm_suspend	NULL

#define ehci_msm_pm_resume	NULL

#endif



static const struct dev_pm_ops ehci_msm_dev_pm_ops = {

	SET_RUNTIME_PM_OPS(ehci_msm_runtime_suspend, ehci_msm_runtime_resume,

			   NULL)

};



static const struct acpi_device_id msm_ehci_acpi_ids[] = {

	{ "QCOM8040", 0 },

	{ }

};

MODULE_DEVICE_TABLE(acpi, msm_ehci_acpi_ids);



static const struct of_device_id msm_ehci_dt_match[] = {

	{ .compatible = "qcom,ehci-host", },

	{}

};

MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);



static struct platform_driver ehci_msm_driver = {

	.probe	= ehci_msm_probe,

	.remove	= ehci_msm_remove,

	.shutdown = usb_hcd_platform_shutdown,

	.driver = {

		   .name = "msm_hsusb_host",

		   .pm = &ehci_msm_dev_pm_ops,

		   .of_match_table = msm_ehci_dt_match,

		   .acpi_match_table = ACPI_PTR(msm_ehci_acpi_ids),

	},

};



static const struct ehci_driver_overrides msm_overrides __initconst = {

	.reset = ehci_msm_reset,

};



static int __init ehci_msm_init(void)

{

	if (usb_disabled())

		return -ENODEV;



	pr_info("%s: " DRIVER_DESC "\n", hcd_name);

	ehci_init_driver(&msm_hc_driver, &msm_overrides);

	return platform_driver_register(&ehci_msm_driver);

}

module_init(ehci_msm_init);



static void __exit ehci_msm_cleanup(void)

{

	platform_driver_unregister(&ehci_msm_driver);

}

module_exit(ehci_msm_cleanup);



MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_ALIAS("platform:msm-ehci");

MODULE_LICENSE("GPL v2");