path: root/include/drivers/arm
diff options
authorAndrew F. Davis <afd@ti.com>2019-01-22 12:39:31 -0600
committerAndrew F. Davis <afd@ti.com>2019-01-22 13:11:09 -0600
commitb5443284f4ea00c67cc3541f21ba1bcb05fea746 (patch)
tree57e4bf920387e2054067f141444e16df2cf26cf1 /include/drivers/arm
parenta0d894397d5729aa72840dc49120f4d198174e22 (diff)
ti: k3: common: Add support for runtime detection of GICR base address
Valid addresses for GICR base are always a set calculable distance from the GICD and is based on the number of cores a given instance of GICv3 IP can support. The formula for the number of address bits is given by the ARM GIC-500 TRM section 3.2 as 2^(18+log2(cores)) with the MSB set to one for GICR instances. Holes in the GIC address space are also guaranteed to safely return 0 on reads. This allows us to support runtime detection of the GICR base address by starting from GIC base address plus BIT(18) and walking until the GICR ID register (IIDR) is detected. We stop searching after BIT(20) to prevent searching out into space if something goes wrong. This can be extended out if we ever have a device with 16 or more cores. Signed-off-by: Andrew F. Davis <afd@ti.com>
Diffstat (limited to 'include/drivers/arm')
1 files changed, 1 insertions, 0 deletions
diff --git a/include/drivers/arm/gicv3.h b/include/drivers/arm/gicv3.h
index 2382697748..72221acb0f 100644
--- a/include/drivers/arm/gicv3.h
+++ b/include/drivers/arm/gicv3.h
@@ -84,6 +84,7 @@
#define GICR_SGIBASE_OFFSET U(65536) /* 64 KB */
#define GICR_CTLR U(0x0)
+#define GICR_IIDR U(0x04)
#define GICR_TYPER U(0x08)
#define GICR_WAKER U(0x14)
#define GICR_PROPBASER U(0x70)