/* * Copyright 2012 Tilera Corporation. All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2. * * 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, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. */ /* * Tilera TILE-Gx USB OHCI host controller driver. */ #include #include #include #include #include #include #include static void tilegx_start_ohc(void) { } static void tilegx_stop_ohc(void) { } static int tilegx_ohci_start(struct usb_hcd *hcd) { struct ohci_hcd *ohci = hcd_to_ohci(hcd); int ret; ret = ohci_init(ohci); if (ret < 0) return ret; ret = ohci_run(ohci); if (ret < 0) { dev_err(hcd->self.controller, "can't start %s\n", hcd->self.bus_name); ohci_stop(hcd); return ret; } return 0; } static const struct hc_driver ohci_tilegx_hc_driver = { .description = hcd_name, .product_desc = "Tile-Gx OHCI", .hcd_priv_size = sizeof(struct ohci_hcd), /* * Generic hardware linkage. */ .irq = ohci_irq, .flags = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11, /* * Basic lifecycle operations. */ .start = tilegx_ohci_start, .stop = ohci_stop, .shutdown = ohci_shutdown, /* * Managing I/O requests and associated device resources. */ .urb_enqueue = ohci_urb_enqueue, .urb_dequeue = ohci_urb_dequeue, .endpoint_disable = ohci_endpoint_disable, /* * Scheduling support. */ .get_frame_number = ohci_get_frame, /* * Root hub support. */ .hub_status_data = ohci_hub_status_data, .hub_control = ohci_hub_control, .start_port_reset = ohci_start_port_reset, }; static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev) { struct usb_hcd *hcd; struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); pte_t pte = { 0 }; int my_cpu = smp_processor_id(); int ret; if (usb_disabled()) return -ENODEV; /* * Try to initialize our GXIO context; if we can't, the device * doesn't exist. */ if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 0) != 0) return -ENXIO; hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { ret = -ENOMEM; goto err_hcd; } /* * We don't use rsrc_start to map in our registers, but seems like * we ought to set it to something, so we use the register VA. */ hcd->rsrc_start = (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx); hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx); hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx); tilegx_start_ohc(); /* Create our IRQs and register them. */ pdata->irq = irq_alloc_hwirq(-1); if (!pdata->irq) { ret = -ENXIO; goto err_no_irq; } tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU); /* Configure interrupts. */ ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx, cpu_x(my_cpu), cpu_y(my_cpu), KERNEL_PL, pdata->irq); if (ret) { ret = -ENXIO; goto err_have_irq; } /* Register all of our memory. */ pte = pte_set_home(pte, PAGE_HOME_HASH); ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0); if (ret) { ret = -ENXIO; goto err_have_irq; } ohci_hcd_init(hcd_to_ohci(hcd)); ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED); if (ret == 0) { platform_set_drvdata(pdev, hcd); device_wakeup_enable(hcd->self.controller); return ret; } err_have_irq: irq_free_hwirq(pdata->irq); err_no_irq: tilegx_stop_ohc(); usb_put_hcd(hcd); err_hcd: gxio_usb_host_destroy(&pdata->usb_ctx); return ret; } static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); usb_remove_hcd(hcd); usb_put_hcd(hcd); tilegx_stop_ohc(); gxio_usb_host_destroy(&pdata->usb_ctx); irq_free_hwirq(pdata->irq); return 0; } static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev) { usb_hcd_platform_shutdown(pdev); ohci_hcd_tilegx_drv_remove(pdev); } static struct platform_driver ohci_hcd_tilegx_driver = { .probe = ohci_hcd_tilegx_drv_probe, .remove = ohci_hcd_tilegx_drv_remove, .shutdown = ohci_hcd_tilegx_drv_shutdown, .driver = { .name = "tilegx-ohci", } }; MODULE_ALIAS("platform:tilegx-ohci"); ' selected='selected'>includemode:
authorMarc Zyngier <marc.zyngier@arm.com>2017-01-17 16:00:48 +0000
committerThomas Gleixner <tglx@linutronix.de>2017-01-30 15:18:56 +0100
commit08d85f3ea99f1eeafc4e8507936190e86a16ee8c (patch)
tree410bb1acd0cd7dcfaad37ae7b63ff243b7fa4bee /tools/lib/traceevent/event-parse.h
parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
irqdomain: Avoid activating interrupts more than once
Since commit f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early"), we can end-up activating a PCI/MSI twice (once at allocation time, and once at startup time). This is normally of no consequences, except that there is some HW out there that may misbehave if activate is used more than once (the GICv3 ITS, for example, uses the activate callback to issue the MAPVI command, and the architecture spec says that "If there is an existing mapping for the EventID-DeviceID combination, behavior is UNPREDICTABLE"). While this could be worked around in each individual driver, it may make more sense to tackle the issue at the core level. In order to avoid getting in that situation, let's have a per-interrupt flag to remember if we have already activated that interrupt or not. Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early") Reported-and-tested-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'tools/lib/traceevent/event-parse.h')