• Thomas Petazzoni's avatar
    irqchip: add basic infrastructure · f6e916b8
    Thomas Petazzoni authored
    With the recent creation of the drivers/irqchip/ directory, it is
    desirable to move irq controller drivers here. At the moment, the only
    driver here is irq-bcm2835, the driver for the irq controller found in
    the ARM BCM2835 SoC, present in Rasberry Pi systems. This irq
    controller driver was exporting its initialization function and its
    irq handling function through a header file in
    When proposing to also move another irq controller driver in
    drivers/irqchip, Rob Herring raised the very valid point that moving
    things to drivers/irqchip was good in order to remove more stuff from
    arch/arm, but if it means adding gazillions of headers files in
    include/linux/irqchip/, it would not be very nice.
    So, upon the suggestion of Rob Herring and Arnd Bergmann, this commit
    introduces a small infrastructure that defines a central
    irqchip_init() function in drivers/irqchip/irqchip.c, which is meant
    to be called as the ->init_irq() callback of ARM platforms. This
    function calls of_irq_init() with an array of match strings and init
    functions generated from a special linker section.
    Note that the irq controller driver initialization function is
    responsible for setting the global handle_arch_irq() variable, so that
    ARM platforms no longer have to define the ->handle_irq field in their
    DT_MACHINE structure.
    A global header, <linux/irqchip.h> is also added to expose the single
    irqchip_init() function to the reset of the kernel.
    A further commit moves the BCM2835 irq controller driver to this new
    small infrastructure, therefore removing the include/linux/irqchip/
    Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
    Reviewed-by: default avatarStephen Warren <swarren@wwwdotorg.org>
    Reviewed-by: default avatarRob Herring <rob.herring@calxeda.com>
    Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
    [rob.herring: reword commit message to reflect use of linker sections.]
    Signed-off-by: default avatarRob Herring <rob.herring@calxeda.com>
irqchip.c 802 Bytes