summaryrefslogtreecommitdiff
path: root/include/linux
diff options
context:
space:
mode:
authorJon Hunter <jonathanh@nvidia.com>2016-06-07 16:12:34 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2016-06-13 11:53:52 +0100
commit9c8edddfc9924cb473a7570c37ca466db70728f8 (patch)
treea6b1cae251ef6fa88d2a3310e30ddfc2cdc254bb /include/linux
parent39f8f23d13666c4c5644e5add7d9598d9e798f22 (diff)
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 'include/linux')
-rw-r--r--include/linux/irqchip/arm-gic.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index ffcbd8b9a4ff..eafc965b3eb8 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -117,6 +117,12 @@ void gic_dist_restore(struct gic_chip_data *gic);
int gic_of_init(struct device_node *node, struct device_node *parent);
/*
+ * Initialises and registers a non-root or child GIC chip. Memory for
+ * the gic_chip_data structure is dynamically allocated.
+ */
+int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq);
+
+/*
* Legacy platforms not converted to DT yet must use this to init
* their GIC
*/