/** * dwc3-keystone.c - Keystone Specific Glue layer * * Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com * * Author: WingMan Kwok * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 of * the License 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. */ #include #include #include #include #include #include #include #include /* USBSS register offsets */ #define USBSS_REVISION 0x0000 #define USBSS_SYSCONFIG 0x0010 #define USBSS_IRQ_EOI 0x0018 #define USBSS_IRQSTATUS_RAW_0 0x0020 #define USBSS_IRQSTATUS_0 0x0024 #define USBSS_IRQENABLE_SET_0 0x0028 #define USBSS_IRQENABLE_CLR_0 0x002c /* IRQ register bits */ #define USBSS_IRQ_EOI_LINE(n) BIT(n) #define USBSS_IRQ_EVENT_ST BIT(0) #define USBSS_IRQ_COREIRQ_EN BIT(0) #define USBSS_IRQ_COREIRQ_CLR BIT(0) struct dwc3_keystone { struct device *dev; struct clk *clk; void __iomem *usbss; }; static inline u32 kdwc3_readl(void __iomem *base, u32 offset) { return readl(base + offset); } static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value) { writel(value, base + offset); } static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc) { u32 val; val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0); val |= USBSS_IRQ_COREIRQ_EN; kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val); } static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc) { u32 val; val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0); val &= ~USBSS_IRQ_COREIRQ_EN; kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val); } static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc) { struct dwc3_keystone *kdwc = _kdwc; kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR); kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST); kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN); kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0)); return IRQ_HANDLED; } static int kdwc3_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *node = pdev->dev.of_node; struct dwc3_keystone *kdwc; struct resource *res; int error, irq; kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL); if (!kdwc) return -ENOMEM; platform_set_drvdata(pdev, kdwc); kdwc->dev = dev; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); kdwc->usbss = devm_ioremap_resource(dev, res); if (IS_ERR(kdwc->usbss)) return PTR_ERR(kdwc->usbss); kdwc->clk = devm_clk_get(kdwc->dev, "usb"); error = clk_prepare_enable(kdwc->clk); if (error < 0) { dev_err(kdwc->dev, "unable to enable usb clock, error %d\n", error); return error; } irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(&pdev->dev, "missing irq\n"); error = irq; goto err_irq; } error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED, dev_name(dev), kdwc); if (error) { dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, error); goto err_irq; } kdwc3_enable_irqs(kdwc); error = of_platform_populate(node, NULL, NULL, dev); if (error) { dev_err(&pdev->dev, "failed to create dwc3 core\n"); goto err_core; } return 0; err_core: kdwc3_disable_irqs(kdwc); err_irq: clk_disable_unprepare(kdwc->clk); return error; } static int kdwc3_remove_core(struct device *dev, void *c) { struct platform_device *pdev = to_platform_device(dev); platform_device_unregister(pdev); return 0; } static int kdwc3_remove(struct platform_device *pdev) { struct dwc3_keystone *kdwc = platform_get_drvdata(pdev); kdwc3_disable_irqs(kdwc); device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core); clk_disable_unprepare(kdwc->clk); platform_set_drvdata(pdev, NULL); return 0; } static const struct of_device_id kdwc3_of_match[] = { { .compatible = "ti,keystone-dwc3", }, {}, }; MODULE_DEVICE_TABLE(of, kdwc3_of_match); static struct platform_driver kdwc3_driver = { .probe = kdwc3_probe, .remove = kdwc3_remove, .driver = { .name = "keystone-dwc3", .of_match_table = kdwc3_of_match, }, }; module_platform_driver(kdwc3_driver); MODULE_ALIAS("platform:keystone-dwc3"); MODULE_AUTHOR("WingMan Kwok "); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer"); 49 +0100 commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch) treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /include/drm/drm_auth.h parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/drm/drm_auth.h')