From mboxrd@z Thu Jan 1 00:00:00 1970 From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni) Date: Sat, 27 Oct 2012 18:45:14 +0200 Subject: [PATCH 1/3] irqchip: add basic infrastructure Message-ID: <1351356317-16758-1-git-send-email-thomas.petazzoni@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 that will progressively contain the compatible strings of each irq controller driver, and also a reference to the initialization functions of such drivers. The drivers/irqchip/irqchip.h header file, currently empty, is added to allow irq controller drivers to expose their initialization function to the main irqchip.c file. 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, 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 --- drivers/irqchip/Kconfig | 3 ++- drivers/irqchip/Makefile | 1 + drivers/irqchip/irqchip.c | 23 +++++++++++++++++++++++ drivers/irqchip/irqchip.h | 14 ++++++++++++++ include/linux/irqchip.h | 16 ++++++++++++++++ 5 files changed, 56 insertions(+), 1 deletion(-) create mode 100644 drivers/irqchip/irqchip.c create mode 100644 drivers/irqchip/irqchip.h create mode 100644 include/linux/irqchip.h diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 1bb8bf6..e0ff166 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -1 +1,2 @@ -# empty +config USE_IRQCHIP + bool diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 054321d..77adcb1 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -1 +1,2 @@ +obj-$(CONFIG_USE_IRQCHIP) += irqchip.o obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c new file mode 100644 index 0000000..410f99f --- /dev/null +++ b/drivers/irqchip/irqchip.c @@ -0,0 +1,23 @@ +/* + * Copyright (C) 2012 Thomas Petazzoni + * + * Thomas Petazzoni + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include + +#include "irqchip.h" + +static const struct of_device_id irqchip_of_match[] __initconst = { + {}, +}; + +void __init irqchip_init(void) +{ + of_irq_init(irqchip_of_match); +} diff --git a/drivers/irqchip/irqchip.h b/drivers/irqchip/irqchip.h new file mode 100644 index 0000000..1e7a5c2 --- /dev/null +++ b/drivers/irqchip/irqchip.h @@ -0,0 +1,14 @@ +/* + * Copyright (C) 2012 Thomas Petazzoni + * + * Thomas Petazzoni + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#ifndef _IRQCHIP_H +#define _IRQCHIP_H + +#endif diff --git a/include/linux/irqchip.h b/include/linux/irqchip.h new file mode 100644 index 0000000..e0006f1 --- /dev/null +++ b/include/linux/irqchip.h @@ -0,0 +1,16 @@ +/* + * Copyright (C) 2012 Thomas Petazzoni + * + * Thomas Petazzoni + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#ifndef _LINUX_IRQCHIP_H +#define _LINUX_IRQCHIP_H + +void irqchip_init(void); + +#endif -- 1.7.9.5