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authorMa Jun <majun258@huawei.com>2015-12-17 19:56:35 +0800
committerMarc Zyngier <marc.zyngier@arm.com>2015-12-18 11:44:20 +0000
commit717c3dbc118ecbbd5dab06c7e02dac68d3f62e1d (patch)
tree0222c4f53d06b030288d3eca8ed0531dd0e555bb /drivers/irqchip/Kconfig
parent752b1b94e6c56af3621a4cad20bdc3032ae60950 (diff)
downloadlinux-717c3dbc118ecbbd5dab06c7e02dac68d3f62e1d.tar.bz2
irqchip/mgigen: Add platform device driver for mbigen device
Mbigen means Message Based Interrupt Generator(MBIGEN). Its a kind of interrupt controller that collects the interrupts from external devices and generate msi interrupt. Mbigen is applied to reduce the number of wire connected interrupts. As the peripherals increasing, the interrupts lines needed is increasing much, especially on the Arm64 server SOC. Therefore, the interrupt pin in GIC is not enough to cover so many peripherals. Mbigen is designed to fix this problem. Mbigen chip locates in ITS or outside of ITS. Mbigen chip hardware structure shows as below: mbigen chip |---------------------|-------------------| mgn_node0 mgn_node1 mgn_node2 | |-------| |-------|------| dev1 dev1 dev2 dev1 dev3 dev4 Each mbigen chip contains several mbigen nodes. External devices can connect to mbigen node through wire connecting way. Because a mbigen node only can support 128 interrupt maximum, depends on the interrupt lines number of devices, a device can connects to one more mbigen nodes. Also, several different devices can connect to a same mbigen node. When devices triggered interrupt,mbigen chip detects and collects the interrupts and generates the MBI interrupts by writing the ITS Translator register. To simplify mbigen driver,I used a new conception--mbigen device. Each mbigen device is initialized as a platform device. Mbigen device presents the parts(register, pin definition etc.) in mbigen chip corresponding to a peripheral device. So from software view, the structure likes below mbigen chip |---------------------|-----------------| mbigen device1 mbigen device2 mbigen device3 | | | dev1 dev2 dev3 Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Ma Jun <majun258@huawei.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip/Kconfig')
-rw-r--r--drivers/irqchip/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 4d7294e5d982..b205e158e864 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -27,6 +27,14 @@ config ARM_GIC_V3_ITS
bool
select PCI_MSI_IRQ_DOMAIN
+config HISILICON_IRQ_MBIGEN
+ bool "Support mbigen interrupt controller"
+ default n
+ depends on ARM_GIC_V3 && ARM_GIC_V3_ITS && GENERIC_MSI_IRQ_DOMAIN
+ help
+ Enable the mbigen interrupt controller used on
+ Hisilicon platform.
+
config ARM_NVIC
bool
select IRQ_DOMAIN