/* * Analog Devices PPI header file * * Copyright (c) 2011 Analog Devices Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef _PPI_H_ #define _PPI_H_ #include #include #include /* EPPI */ #ifdef EPPI_EN #define PORT_EN EPPI_EN #define PORT_DIR EPPI_DIR #define DMA32 0 #define PACK_EN PACKEN #endif /* EPPI3 */ #ifdef EPPI0_CTL2 #define PORT_EN EPPI_CTL_EN #define PORT_DIR EPPI_CTL_DIR #define PACK_EN EPPI_CTL_PACKEN #define DMA32 0 #define DLEN_8 EPPI_CTL_DLEN08 #define DLEN_16 EPPI_CTL_DLEN16 #endif struct ppi_if; struct ppi_params { u32 width; /* width in pixels */ u32 height; /* height in lines */ u32 hdelay; /* delay after the HSYNC in pixels */ u32 vdelay; /* delay after the VSYNC in lines */ u32 line; /* total pixels per line */ u32 frame; /* total lines per frame */ u32 hsync; /* HSYNC length in pixels */ u32 vsync; /* VSYNC length in lines */ int bpp; /* bits per pixel */ int dlen; /* data length for ppi in bits */ u32 ppi_control; /* ppi configuration */ u32 int_mask; /* interrupt mask */ }; struct ppi_ops { int (*attach_irq)(struct ppi_if *ppi, irq_handler_t handler); void (*detach_irq)(struct ppi_if *ppi); int (*start)(struct ppi_if *ppi); int (*stop)(struct ppi_if *ppi); int (*set_params)(struct ppi_if *ppi, struct ppi_params *params); void (*update_addr)(struct ppi_if *ppi, unsigned long addr); }; enum ppi_type { PPI_TYPE_PPI, PPI_TYPE_EPPI, PPI_TYPE_EPPI3, }; struct ppi_info { enum ppi_type type; int dma_ch; int irq_err; void __iomem *base; const unsigned short *pin_req; }; struct ppi_if { struct device *dev; unsigned long ppi_control; const struct ppi_ops *ops; const struct ppi_info *info; bool err_int; /* if we need request error interrupt */ bool err; /* if ppi has fifo error */ void *priv; }; struct ppi_if *ppi_create_instance(struct platform_device *pdev, const struct ppi_info *info); void ppi_delete_instance(struct ppi_if *ppi); #endif ut class='txt' type='search' size='10' name='q' value=''/>
path: root/net/caif/cfdgml.c
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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/caif/cfdgml.c
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 'net/caif/cfdgml.c')