/* * Driver for EHCI UHP on Atmel chips * * Copyright (C) 2009 Atmel Corporation, * Nicolas Ferre * * Based on various ehci-*.c drivers * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include #include #include #include #include #include #include #include #include #include #include "ehci.h" #define DRIVER_DESC "EHCI Atmel driver" static const char hcd_name[] = "ehci-atmel"; /* interface and function clocks */ #define hcd_to_atmel_ehci_priv(h) \ ((struct atmel_ehci_priv *)hcd_to_ehci(h)->priv) struct atmel_ehci_priv { struct clk *iclk; struct clk *uclk; bool clocked; }; static struct hc_driver __read_mostly ehci_atmel_hc_driver; static const struct ehci_driver_overrides ehci_atmel_drv_overrides __initconst = { .extra_priv_size = sizeof(struct atmel_ehci_priv), }; /*-------------------------------------------------------------------------*/ static void atmel_start_clock(struct atmel_ehci_priv *atmel_ehci) { if (atmel_ehci->clocked) return; clk_prepare_enable(atmel_ehci->uclk); clk_prepare_enable(atmel_ehci->iclk); atmel_ehci->clocked = true; } static void atmel_stop_clock(struct atmel_ehci_priv *atmel_ehci) { if (!atmel_ehci->clocked) return; clk_disable_unprepare(atmel_ehci->iclk); clk_disable_unprepare(atmel_ehci->uclk); atmel_ehci->clocked = false; } static void atmel_start_ehci(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); dev_dbg(&pdev->dev, "start\n"); atmel_start_clock(atmel_ehci); } static void atmel_stop_ehci(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); dev_dbg(&pdev->dev, "stop\n"); atmel_stop_clock(atmel_ehci); } /*-------------------------------------------------------------------------*/ static int ehci_atmel_drv_probe(struct platform_device *pdev) { struct usb_hcd *hcd; const struct hc_driver *driver = &ehci_atmel_hc_driver; struct resource *res; struct ehci_hcd *ehci; struct atmel_ehci_priv *atmel_ehci; int irq; int retval; if (usb_disabled()) return -ENODEV; pr_debug("Initializing Atmel-SoC USB Host Controller\n"); irq = platform_get_irq(pdev, 0); if (irq <= 0) { dev_err(&pdev->dev, "Found HC with no IRQ. Check %s setup!\n", dev_name(&pdev->dev)); retval = -ENODEV; goto fail_create_hcd; } /* Right now device-tree probed devices don't get dma_mask set. * Since shared usb code relies on it, set it here for now. * Once we have dma capability bindings this can go away. */ retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); if (retval) goto fail_create_hcd; hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { retval = -ENOMEM; goto fail_create_hcd; } atmel_ehci = hcd_to_atmel_ehci_priv(hcd); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); hcd->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(hcd->regs)) { retval = PTR_ERR(hcd->regs); goto fail_request_resource; } hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); atmel_ehci->iclk = devm_clk_get(&pdev->dev, "ehci_clk"); if (IS_ERR(atmel_ehci->iclk)) { dev_err(&pdev->dev, "Error getting interface clock\n"); retval = -ENOENT; goto fail_request_resource; } atmel_ehci->uclk = devm_clk_get(&pdev->dev, "usb_clk"); if (IS_ERR(atmel_ehci->uclk)) { dev_err(&pdev->dev, "failed to get uclk\n"); retval = PTR_ERR(atmel_ehci->uclk); goto fail_request_resource; } ehci = hcd_to_ehci(hcd); /* registers start at offset 0x0 */ ehci->caps = hcd->regs; atmel_start_ehci(pdev); retval = usb_add_hcd(hcd, irq, IRQF_SHARED); if (retval) goto fail_add_hcd; device_wakeup_enable(hcd->self.controller); return retval; fail_add_hcd: atmel_stop_ehci(pdev); fail_request_resource: usb_put_hcd(hcd); fail_create_hcd: dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval); return retval; } static int ehci_atmel_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); usb_remove_hcd(hcd); usb_put_hcd(hcd); atmel_stop_ehci(pdev); return 0; } static int __maybe_unused ehci_atmel_drv_suspend(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); int ret; ret = ehci_suspend(hcd, false); if (ret) return ret; atmel_stop_clock(atmel_ehci); return 0; } static int __maybe_unused ehci_atmel_drv_resume(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); atmel_start_clock(atmel_ehci); return ehci_resume(hcd, false); } #ifdef CONFIG_OF static const struct of_device_id atmel_ehci_dt_ids[] = { { .compatible = "atmel,at91sam9g45-ehci" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); #endif static SIMPLE_DEV_PM_OPS(ehci_atmel_pm_ops, ehci_atmel_drv_suspend, ehci_atmel_drv_resume); static struct platform_driver ehci_atmel_driver = { .probe = ehci_atmel_drv_probe, .remove = ehci_atmel_drv_remove, .shutdown = usb_hcd_platform_shutdown, .driver = { .name = "atmel-ehci", .pm = &ehci_atmel_pm_ops, .of_match_table = of_match_ptr(atmel_ehci_dt_ids), }, }; static int __init ehci_atmel_init(void) { if (usb_disabled()) return -ENODEV; pr_info("%s: " DRIVER_DESC "\n", hcd_name); ehci_init_driver(&ehci_atmel_hc_driver, &ehci_atmel_drv_overrides); return platform_driver_register(&ehci_atmel_driver); } module_init(ehci_atmel_init); static void __exit ehci_atmel_cleanup(void) { platform_driver_unregister(&ehci_atmel_driver); } module_exit(ehci_atmel_cleanup); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_ALIAS("platform:atmel-ehci"); MODULE_AUTHOR("Nicolas Ferre"); MODULE_LICENSE("GPL"); CIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'net/mac80211/ht.c')