iommu/exynos: add support for power management subsystems.
This adds support for Suspend to RAM and Runtime Power Management.
Since System MMU is located in the same local power domain of its
master H/W, System MMU must be initialized before it is working if
its power domain was ever turned off. TLB invalidation according to
unmapping on page tables must also be performed while power domain is
turned on.
This patch ensures that resume and runtime_resume(restore_state)
functions in this driver is called before the calls to resume and
runtime_resume callback functions in the drivers of master H/Ws.
Likewise, suspend and runtime_suspend(save_state) functions in this
driver is called after the calls to suspend and runtime_suspend in the
drivers of master H/Ws.
In order to get benefit of this support, the master H/W and its System
MMU must resides in the same power domain in terms of Linux kernel. If
a master H/W does not use generic I/O power domain, its driver must
call iommu_attach_device() after its local power domain is turned on,
iommu_detach_device before turned off.
Signed-off-by: Cho KyongHo <pullip.cho@samsung.com>
1 file changed
