irqchip/gic-v2m: Add workaround for APM X-Gene GICv2m erratum

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APM X-Gene GICv2m implementation has an erratum where the
MSI data needs to be the offset from the spi_start in order to
trigger the correct MSI interrupt. This is different from the
standard GICv2m implementation where the MSI data is the absolute
value within the range from spi_start to (spi_start + num_spis)
of each v2m frame.

This patch reads MSI_IIDR register (present in all GICv2m
implementations) to identify X-Gene GICv2m implementation and
apply workaround to change the data portion of MSI vector.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Duc Dang <dhdang@apm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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Duc Dang 2015-10-06 15:32:38 -07:00 • committed by Marc Zyngier

parent 6d32ab2d8a

commit ee5f7d6462

1 changed files with 22 additions and 0 deletions

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drivers/irqchip/irq-gic-v2m.c

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