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authorJon Hunter <jonathanh@nvidia.com>2016-06-07 18:12:34 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2016-06-13 13:53:52 +0300
commit9c8edddfc9924cb473a7570c37ca466db70728f8 (patch)
treea6b1cae251ef6fa88d2a3310e30ddfc2cdc254bb /drivers/irqchip/Kconfig
parent39f8f23d13666c4c5644e5add7d9598d9e798f22 (diff)
downloadlinux-9c8edddfc9924cb473a7570c37ca466db70728f8.tar.xz
irqchip/gic: Add platform driver for non-root GICs that require RPM
Add a platform driver to support non-root GICs that require runtime power-management. Currently, only non-root GICs are supported because the functions, smp_cross_call() and set_handle_irq(), that need to be called for a root controller are located in the __init section and so cannot be called by the platform driver. The GIC platform driver re-uses many functions from the existing GIC driver including some functions to save and restore the GIC context during power transitions. The functions for saving and restoring the GIC context are currently only defined if CONFIG_CPU_PM is enabled and to ensure that these functions are always defined when the platform driver is enabled, a dependency on CONFIG_ARM_GIC_PM (which selects the platform driver) has been added. In order to re-use the private GIC initialisation code, a new public function, gic_of_init_child(), has been added which calls various private functions to initialise the GIC. This is different from the existing gic_of_init() because it only supports non-root GICs (ie. does not call smp_cross_call() is set_handle_irq()) and is not located in the __init section (so can be used by platform drivers). Furthermore, gic_of_init_child() dynamically allocates memory for the GIC chip data which is also different from gic_of_init(). There is no specific suspend handling for GICs registered as platform devices. Non-wakeup interrupts will be disabled by the kernel during late suspend, however, this alone will not power down the GIC if interrupts have been requested and not freed. Therefore, requestors of non-wakeup interrupts will need to free them on entering suspend in order to power-down the GIC. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip/Kconfig')
-rw-r--r--drivers/irqchip/Kconfig6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index fa33c50b0e5a..5495a5ba8039 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -8,6 +8,12 @@ config ARM_GIC
select IRQ_DOMAIN_HIERARCHY
select MULTI_IRQ_HANDLER
+config ARM_GIC_PM
+ bool
+ depends on PM
+ select ARM_GIC
+ select PM_CLK
+
config ARM_GIC_MAX_NR
int
default 2 if ARCH_REALVIEW