irqchip: mips-gic: Provide VP ID accessor
Provide a gic_read_local_vp_id() function to read the VCNUM field of the
GICs local VP_IDENT register. This will be used by a further patch to
check that the value reported by the GIC matches up with the kernels
calculation.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12334/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index e28311f..c089f49 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -246,6 +246,14 @@
#endif
+unsigned gic_read_local_vp_id(void)
+{
+ unsigned long ident;
+
+ ident = gic_read(GIC_REG(VPE_LOCAL, GIC_VP_IDENT));
+ return ident & GIC_VP_IDENT_VCNUM_MSK;
+}
+
static bool gic_local_irq_is_routable(int intr)
{
u32 vpe_ctl;
