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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2012-11-21 02:00:52 +0400
committerRob Herring <rob.herring@calxeda.com>2013-01-10 21:44:38 +0400
commitf6e916b82022cba67bdd0ec7df84e2bce2ef3f73 (patch)
tree77f6ac7c496d9016937f59651fcf91670286dcd3
parentedd96900cfd5f993b448dcdcb0e13090701554ae (diff)
downloadlinux-f6e916b82022cba67bdd0ec7df84e2bce2ef3f73.tar.xz
irqchip: add basic infrastructure
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>
-rw-r--r--drivers/irqchip/Kconfig4
-rw-r--r--drivers/irqchip/Makefile2
-rw-r--r--drivers/irqchip/irqchip.c30
-rw-r--r--drivers/irqchip/irqchip.h29
-rw-r--r--include/asm-generic/vmlinux.lds.h12
-rw-r--r--include/linux/irqchip.h16
6 files changed, 92 insertions, 1 deletions
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 62ca575701d3..93dfd8fa66c7 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -1,3 +1,7 @@
+config IRQCHIP
+ def_bool y
+ depends on OF_IRQ
+
config VERSATILE_FPGA_IRQ
bool
select IRQ_DOMAIN
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index bf4609a5bd9d..29b78c9449c8 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -1,3 +1,5 @@
+obj-$(CONFIG_IRQCHIP) += irqchip.o
+
obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o
obj-$(CONFIG_ARCH_SUNXI) += irq-sunxi.o
obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c
new file mode 100644
index 000000000000..f496afce29de
--- /dev/null
+++ b/drivers/irqchip/irqchip.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2012 Thomas Petazzoni
+ *
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * 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 <linux/init.h>
+#include <linux/of_irq.h>
+
+#include "irqchip.h"
+
+/*
+ * This special of_device_id is the sentinel at the end of the
+ * of_device_id[] array of all irqchips. It is automatically placed at
+ * the end of the array by the linker, thanks to being part of a
+ * special section.
+ */
+static const struct of_device_id
+irqchip_of_match_end __used __section(__irqchip_of_end);
+
+extern struct of_device_id __irqchip_begin[];
+
+void __init irqchip_init(void)
+{
+ of_irq_init(__irqchip_begin);
+}
diff --git a/drivers/irqchip/irqchip.h b/drivers/irqchip/irqchip.h
new file mode 100644
index 000000000000..e445ba2d6add
--- /dev/null
+++ b/drivers/irqchip/irqchip.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2012 Thomas Petazzoni
+ *
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * 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
+
+/*
+ * This macro must be used by the different irqchip drivers to declare
+ * the association between their DT compatible string and their
+ * initialization function.
+ *
+ * @name: name that must be unique accross all IRQCHIP_DECLARE of the
+ * same file.
+ * @compstr: compatible string of the irqchip driver
+ * @fn: initialization function
+ */
+#define IRQCHIP_DECLARE(name,compstr,fn) \
+ static const struct of_device_id irqchip_of_match_##name \
+ __used __section(__irqchip_of_table) \
+ = { .compatible = compstr, .data = fn }
+
+#endif
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index d1ea7ce0b4cb..c80c599897b9 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -149,6 +149,15 @@
#define TRACE_SYSCALLS()
#endif
+#ifdef CONFIG_IRQCHIP
+#define IRQCHIP_OF_MATCH_TABLE() \
+ . = ALIGN(8); \
+ VMLINUX_SYMBOL(__irqchip_begin) = .; \
+ *(__irqchip_of_table) \
+ *(__irqchip_of_end)
+#else
+#define IRQCHIP_OF_MATCH_TABLE()
+#endif
#define KERNEL_DTB() \
STRUCT_ALIGN(); \
@@ -493,7 +502,8 @@
DEV_DISCARD(init.rodata) \
CPU_DISCARD(init.rodata) \
MEM_DISCARD(init.rodata) \
- KERNEL_DTB()
+ KERNEL_DTB() \
+ IRQCHIP_OF_MATCH_TABLE()
#define INIT_TEXT \
*(.init.text) \
diff --git a/include/linux/irqchip.h b/include/linux/irqchip.h
new file mode 100644
index 000000000000..e0006f1d35a0
--- /dev/null
+++ b/include/linux/irqchip.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2012 Thomas Petazzoni
+ *
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * 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