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irqchip/gic-v3-its: Add ability to save/restore ITS state

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Some platforms power off GIC logic in suspend, so we need to
save/restore state. The distributor and redistributor registers need
to be handled in firmware code due to access permissions on those
registers, but the ITS registers can be restored in the kernel.

We limit this to systems where the ITS collections are implemented
in HW (as opposed to being backed by memory tables), as they are
the only ones that cannot be dealt with by the firmware.

Signed-off-by: Derek Basehore <dbasehore@chromium.org>
[maz: fixed changelog, dropped DT property, limited to HCC being >0]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Derek Basehore
2018-02-28 21:48:18 -08:00
committed by Marc Zyngier
parent f736d65df0
commit dba0bc7b76
2 changed files with 109 additions and 1 deletions
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3
include/linux/irqchip/arm-gic-v3.h
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@@ -312,7 +312,8 @@
#define GITS_TYPER_DEVBITS_SHIFT 13
#define GITS_TYPER_DEVBITS(r) ((((r) >> GITS_TYPER_DEVBITS_SHIFT) & 0x1f) + 1)
#define GITS_TYPER_PTA (1UL << 19)
#define GITS_TYPER_HWCOLLCNT_SHIFT 24
#define GITS_TYPER_HCC_SHIFT 24
#define GITS_TYPER_HCC(r) (((r) >> GITS_TYPER_HCC_SHIFT) & 0xff)
#define GITS_TYPER_VMOVP (1ULL << 37)
#define GITS_IIDR_REV_SHIFT 12