/* * Apple Onboard Audio GPIO definitions * * Copyright 2006 Johannes Berg * * GPL v2, can be found in COPYING. */ #ifndef __AOA_GPIO_H #define __AOA_GPIO_H #include #include #include typedef void (*notify_func_t)(void *data); enum notify_type { AOA_NOTIFY_HEADPHONE, AOA_NOTIFY_LINE_IN, AOA_NOTIFY_LINE_OUT, }; struct gpio_runtime; struct gpio_methods { /* for initialisation/de-initialisation of the GPIO layer */ void (*init)(struct gpio_runtime *rt); void (*exit)(struct gpio_runtime *rt); /* turn off headphone, speakers, lineout */ void (*all_amps_off)(struct gpio_runtime *rt); /* turn headphone, speakers, lineout back to previous setting */ void (*all_amps_restore)(struct gpio_runtime *rt); void (*set_headphone)(struct gpio_runtime *rt, int on); void (*set_speakers)(struct gpio_runtime *rt, int on); void (*set_lineout)(struct gpio_runtime *rt, int on); void (*set_master)(struct gpio_runtime *rt, int on); int (*get_headphone)(struct gpio_runtime *rt); int (*get_speakers)(struct gpio_runtime *rt); int (*get_lineout)(struct gpio_runtime *rt); int (*get_master)(struct gpio_runtime *rt); void (*set_hw_reset)(struct gpio_runtime *rt, int on); /* use this to be notified of any events. The notification * function is passed the data, and is called in process * context by the use of schedule_work. * The interface for it is that setting a function to NULL * removes it, and they return 0 if the operation succeeded, * and -EBUSY if the notification is already assigned by * someone else. */ int (*set_notify)(struct gpio_runtime *rt, enum notify_type type, notify_func_t notify, void *data); /* returns 0 if not plugged in, 1 if plugged in * or a negative error code */ int (*get_detect)(struct gpio_runtime *rt, enum notify_type type); }; struct gpio_notification { struct delayed_work work; notify_func_t notify; void *data; void *gpio_private; struct mutex mutex; }; struct gpio_runtime { /* to be assigned by fabric */ struct device_node *node; /* since everyone needs this pointer anyway... */ struct gpio_methods *methods; /* to be used by the gpio implementation */ int implementation_private; struct gpio_notification headphone_notify; struct gpio_notification line_in_notify; struct gpio_notification line_out_notify; }; #endif /* __AOA_GPIO_H */ 46ed9b415c25e92'/>
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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 /kernel
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 'kernel')