[ARM] Add support for ARM RealView board
Support for RealView EB.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/include/asm-arm/arch-realview/entry-macro.S b/include/asm-arm/arch-realview/entry-macro.S
new file mode 100644
index 0000000..2712ba7
--- /dev/null
+++ b/include/asm-arm/arch-realview/entry-macro.S
@@ -0,0 +1,49 @@
+/*
+ * include/asm-arm/arch-realview/entry-macro.S
+ *
+ * Low-level IRQ helper macros for RealView platforms
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <asm/hardware/gic.h>
+
+ .macro disable_fiq
+ .endm
+
+ /*
+ * The interrupt numbering scheme is defined in the
+ * interrupt controller spec. To wit:
+ *
+ * Interrupts 0-15 are IPI
+ * 16-28 are reserved
+ * 29-31 are local. We allow 30 to be used for the watchdog.
+ * 32-1020 are global
+ * 1021-1022 are reserved
+ * 1023 is "spurious" (no interrupt)
+ *
+ * For now, we ignore all local interrupts so only return an interrupt if it's
+ * between 30 and 1020. The test_for_ipi routine below will pick up on IPIs.
+ *
+ * A simple read from the controller will tell us the number of the highest
+ * priority enabled interrupt. We then just need to check whether it is in the
+ * valid range for an IRQ (30-1020 inclusive).
+ */
+
+ .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
+
+ ldr \base, =IO_ADDRESS(REALVIEW_GIC_CPU_BASE)
+ ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 = src CPU, 9-0 = int # */
+
+ ldr \tmp, =1021
+
+ bic \irqnr, \irqstat, #0x1c00
+
+ cmp \irqnr, #29
+ cmpcc \irqnr, \irqnr
+ cmpne \irqnr, \tmp
+ cmpcs \irqnr, \irqnr
+
+ .endm