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![Andrzej Hajda](/assets/img/avatar_default.png)
The function can return negative values. The problem has been detected using proposed semantic patch scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1]. [1]: http://permalink.gmane.org/gmane.linux.kernel/2038576 Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
233 lines
5.5 KiB
C
233 lines
5.5 KiB
C
/* ehci-msm.c - HSUSB Host Controller Driver Implementation
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*
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* Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
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*
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* Partly derived from ehci-fsl.c and ehci-hcd.c
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* Copyright (c) 2000-2004 by David Brownell
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* Copyright (c) 2005 MontaVista Software
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*
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* All source code in this file is licensed under the following license except
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* where indicated.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* See the GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can find it at http://www.fsf.org
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/msm_hsusb_hw.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ehci.h"
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#define MSM_USB_BASE (hcd->regs)
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#define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"
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static const char hcd_name[] = "ehci-msm";
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static struct hc_driver __read_mostly msm_hc_driver;
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static int ehci_msm_reset(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int retval;
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ehci->caps = USB_CAPLENGTH;
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hcd->has_tt = 1;
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retval = ehci_setup(hcd);
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if (retval)
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return retval;
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/* bursts of unspecified length. */
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writel(0, USB_AHBBURST);
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/* Use the AHB transactor */
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writel(0, USB_AHBMODE);
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/* Disable streaming mode and select host mode */
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writel(0x13, USB_USBMODE);
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return 0;
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}
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static int ehci_msm_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd;
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struct resource *res;
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struct usb_phy *phy;
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int ret;
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dev_dbg(&pdev->dev, "ehci_msm proble\n");
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hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
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if (!hcd) {
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dev_err(&pdev->dev, "Unable to create HCD\n");
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return -ENOMEM;
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}
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ret = platform_get_irq(pdev, 0);
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if (ret < 0) {
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dev_err(&pdev->dev, "Unable to get IRQ resource\n");
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goto put_hcd;
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}
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hcd->irq = ret;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "Unable to get memory resource\n");
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ret = -ENODEV;
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goto put_hcd;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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dev_err(&pdev->dev, "ioremap failed\n");
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ret = -ENOMEM;
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goto put_hcd;
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}
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/*
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* OTG driver takes care of PHY initialization, clock management,
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* powering up VBUS, mapping of registers address space and power
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* management.
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*/
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if (pdev->dev.of_node)
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phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
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else
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phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
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if (IS_ERR(phy)) {
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dev_err(&pdev->dev, "unable to find transceiver\n");
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ret = -EPROBE_DEFER;
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goto put_hcd;
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}
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ret = otg_set_host(phy->otg, &hcd->self);
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if (ret < 0) {
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dev_err(&pdev->dev, "unable to register with transceiver\n");
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goto put_hcd;
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}
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hcd->usb_phy = phy;
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device_init_wakeup(&pdev->dev, 1);
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/*
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* OTG device parent of HCD takes care of putting
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* hardware into low power mode.
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*/
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pm_runtime_no_callbacks(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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/* FIXME: need to call usb_add_hcd() here? */
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return 0;
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put_hcd:
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usb_put_hcd(hcd);
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return ret;
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}
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static int ehci_msm_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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device_init_wakeup(&pdev->dev, 0);
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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otg_set_host(hcd->usb_phy->otg, NULL);
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/* FIXME: need to call usb_remove_hcd() here? */
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usb_put_hcd(hcd);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ehci_msm_pm_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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bool do_wakeup = device_may_wakeup(dev);
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dev_dbg(dev, "ehci-msm PM suspend\n");
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return ehci_suspend(hcd, do_wakeup);
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}
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static int ehci_msm_pm_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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dev_dbg(dev, "ehci-msm PM resume\n");
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ehci_resume(hcd, false);
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return 0;
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}
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#else
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#define ehci_msm_pm_suspend NULL
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#define ehci_msm_pm_resume NULL
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#endif
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static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
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.suspend = ehci_msm_pm_suspend,
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.resume = ehci_msm_pm_resume,
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};
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static const struct of_device_id msm_ehci_dt_match[] = {
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{ .compatible = "qcom,ehci-host", },
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{}
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};
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MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
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static struct platform_driver ehci_msm_driver = {
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.probe = ehci_msm_probe,
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.remove = ehci_msm_remove,
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.driver = {
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.name = "msm_hsusb_host",
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.pm = &ehci_msm_dev_pm_ops,
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.of_match_table = msm_ehci_dt_match,
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},
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};
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static const struct ehci_driver_overrides msm_overrides __initdata = {
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.reset = ehci_msm_reset,
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};
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static int __init ehci_msm_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ehci_init_driver(&msm_hc_driver, &msm_overrides);
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return platform_driver_register(&ehci_msm_driver);
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}
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module_init(ehci_msm_init);
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static void __exit ehci_msm_cleanup(void)
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{
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platform_driver_unregister(&ehci_msm_driver);
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}
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module_exit(ehci_msm_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_ALIAS("platform:msm-ehci");
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MODULE_LICENSE("GPL");
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