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* irqchip / ACPI: Add probing infrastructure for ACPI-based irqchipsMarc Zyngier2015-10-011-0/+17
| | | | | | | | | | | | | | | | DT enjoys a rather nice probing infrastructure for irqchips, while ACPI is so far stuck into a very distant past. This patch introduces a declarative API, allowing irqchips to be self-contained and be called when a particular entry is matched in the MADT table. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
* irqchip: Move IRQCHIP_DECLARE macro to include/linux/irqchip.hJoel Porquet2015-07-021-0/+14
| | | | | | | | | | | | | | | | | | | | | | | At the moment the IRQCHIP_DECLARE macro is only declared locally in drivers/irqchip/irqchip.h. It prevents from using it directly in arch/* directories whenever irqchip drivers only exist there, which happens in a few cases (e.g. arc, arm, microblaze and mips). This patch makes the macro to be globally defined, i.e. in include/linux/irqchip.h, and thus usable for arch-specific declarations of irqchip drivers. In this way, it is very similar to what clocksource does (ie CLOCKSOURCE_OF_DECLARE is defined in include/linux/clocksource.h). For now, this patch only moves the declaration of the macro IRQCHIP_DECLARE to the global header 'include/linux/irqchip.h' and make 'drivers/irqchip/irqchip.h' include 'include/linux/irqchip.h'. Later, other patches will get rid of 'drivers/irqchip/irqchip.h' and modify all the impacted irqchip drivers. Signed-off-by: Joel Porquet <joel@porquet.org> Cc: Jason Cooper <jason@lakedaemon.net> Link: http://lkml.kernel.org/r/1435865565-14114-1-git-send-email-joel@porquet.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* irqchip: Add irqchip_init dummy functionBastian Hecht2013-06-061-0/+4
| | | | | | | | | | | | | | | | We add an empty irqchip_init dummy function for cases in which CONFIG_IRQCHIP is not used. In these cases irqchip.c is not compiled, but a funtion call may still be present in architecture code, that in runtime doesn't get hit. E.g. this is needed in the arch/arm/mach-shmobile/intc-r8a7740.c interrupt setup code where OF use and non OF us is both handled in one file. Signed-off-by: Bastian Hecht <hechtb+renesas@gmail.com> [horms+renesas@verge.net.au: Make non-CONFIG_IRQCHIP version static inline and remove trailing ';'.] Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
* irqchip: add basic infrastructureThomas Petazzoni2013-01-101-0/+16
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 <linux/irqchip/bcm2835.h>. 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/ directory. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Stephen Warren <swarren@wwwdotorg.org> Reviewed-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Arnd Bergmann <arnd@arndb.de> [rob.herring: reword commit message to reflect use of linker sections.] Signed-off-by: Rob Herring <rob.herring@calxeda.com>
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