/* * OHCI HCD (Host Controller Driver) for USB. * * Copyright (C) 2010 ST Microelectronics. * Deepak Sikri * * Based on various ohci-*.c drivers * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include #include #include #include #include #include #include #include #include #include #include "ohci.h" #define DRIVER_DESC "OHCI SPEAr driver" static const char hcd_name[] = "SPEAr-ohci"; struct spear_ohci { struct clk *clk; }; #define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv) static struct hc_driver __read_mostly ohci_spear_hc_driver; static int spear_ohci_hcd_drv_probe(struct platform_device *pdev) { const struct hc_driver *driver = &ohci_spear_hc_driver; struct ohci_hcd *ohci; struct usb_hcd *hcd = NULL; struct clk *usbh_clk; struct spear_ohci *sohci_p; struct resource *res; int retval, irq; irq = platform_get_irq(pdev, 0); if (irq < 0) { retval = irq; goto fail; } /* * 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; usbh_clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(usbh_clk)) { dev_err(&pdev->dev, "Error getting interface clock\n"); retval = PTR_ERR(usbh_clk); goto fail; } hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { retval = -ENOMEM; goto fail; } 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 err_put_hcd; } hcd->rsrc_start = pdev->resource[0].start; hcd->rsrc_len = resource_size(res); sohci_p = to_spear_ohci(hcd); sohci_p->clk = usbh_clk; clk_prepare_enable(sohci_p->clk); ohci = hcd_to_ohci(hcd); retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0); if (retval == 0) { device_wakeup_enable(hcd->self.controller); return retval; } clk_disable_unprepare(sohci_p->clk); err_put_hcd: usb_put_hcd(hcd); fail: dev_err(&pdev->dev, "init fail, %d\n", retval); return retval; } static int spear_ohci_hcd_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct spear_ohci *sohci_p = to_spear_ohci(hcd); usb_remove_hcd(hcd); if (sohci_p->clk) clk_disable_unprepare(sohci_p->clk); usb_put_hcd(hcd); return 0; } #if defined(CONFIG_PM) static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev, pm_message_t message) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); struct spear_ohci *sohci_p = to_spear_ohci(hcd); bool do_wakeup = device_may_wakeup(&pdev->dev); int ret; if (time_before(jiffies, ohci->next_statechange)) msleep(5); ohci->next_statechange = jiffies; ret = ohci_suspend(hcd, do_wakeup); if (ret) return ret; clk_disable_unprepare(sohci_p->clk); return ret; } static int spear_ohci_hcd_drv_resume(struct platform_device *dev) { struct usb_hcd *hcd = platform_get_drvdata(dev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); struct spear_ohci *sohci_p = to_spear_ohci(hcd); if (time_before(jiffies, ohci->next_statechange)) msleep(5); ohci->next_statechange = jiffies; clk_prepare_enable(sohci_p->clk); ohci_resume(hcd, false); return 0; } #endif static const struct of_device_id spear_ohci_id_table[] = { { .compatible = "st,spear600-ohci", }, { }, }; MODULE_DEVICE_TABLE(of, spear_ohci_id_table); /* Driver definition to register with the platform bus */ static struct platform_driver spear_ohci_hcd_driver = { .probe = spear_ohci_hcd_drv_probe, .remove = spear_ohci_hcd_drv_remove, #ifdef CONFIG_PM .suspend = spear_ohci_hcd_drv_suspend, .resume = spear_ohci_hcd_drv_resume, #endif .driver = { .name = "spear-ohci", .of_match_table = spear_ohci_id_table, }, }; static const struct ohci_driver_overrides spear_overrides __initconst = { .extra_priv_size = sizeof(struct spear_ohci), }; static int __init ohci_spear_init(void) { if (usb_disabled()) return -ENODEV; pr_info("%s: " DRIVER_DESC "\n", hcd_name); ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides); return platform_driver_register(&spear_ohci_hcd_driver); } module_init(ohci_spear_init); static void __exit ohci_spear_cleanup(void) { platform_driver_unregister(&spear_ohci_hcd_driver); } module_exit(ohci_spear_cleanup); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR("Deepak Sikri"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:spear-ohci"); >
authorThomas Gleixner <tglx@linutronix.de>2017-01-31 23:58:38 +0100
committerIngo Molnar <mingo@kernel.org>2017-02-01 08:37:27 +0100
commitdd86e373e09fb16b83e8adf5c48c421a4ca76468 (patch)
tree55703c2ea8584e303e342090614e0aab3509ab21 /drivers/usb/serial/qcaux.c
parent0b3589be9b98994ce3d5aeca52445d1f5627c4ba (diff)
perf/x86/intel/rapl: Make package handling more robust
The package management code in RAPL relies on package mapping being available before a CPU is started. This changed with: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") because the ACPI/BIOS information turned out to be unreliable, but that left RAPL in broken state. This was not noticed because on a regular boot all CPUs are online before RAPL is initialized. A possible fix would be to reintroduce the mess which allocates a package data structure in CPU prepare and when it turns out to already exist in starting throw it away later in the CPU online callback. But that's a horrible hack and not required at all because RAPL becomes functional for perf only in the CPU online callback. That's correct because user space is not yet informed about the CPU being onlined, so nothing caan rely on RAPL being available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/usb/serial/qcaux.c')