powerpc: GE Fanuc's FPGA based PIC controller on the SBC610

Support for the SBC610 VPX Single Board Computer from GE Fanuc (PowerPC MPC8641D).

A number of MPC8641D based route interrupts for on-board interrupts through
a FPGA based interrupt controller, which is chained with the
MPC8641D's mpic. This patch provides a basic driver to allow basic routing
of interrupts to the mpic.

Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 24 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/86xx/gef_sbc610.c b/arch/powerpc/platforms/86xx/gef_sbc610.c
index ee215002b1c..3873c2018cc 100644
--- a/arch/powerpc/platforms/86xx/gef_sbc610.c
+++ b/arch/powerpc/platforms/86xx/gef_sbc610.c
@@ -39,6 +39,7 @@
 #include <sysdev/fsl_soc.h>
 
 #include "mpc86xx.h"
+#include "gef_pic.h"
 
 #undef DEBUG
 
@@ -48,6 +49,28 @@
 #define DBG (fmt...) do { } while (0)
 #endif
 
+void __iomem *sbc610_regs;
+
+static void __init gef_sbc610_init_irq(void)
+{
+        struct device_node *cascade_node = NULL;
+
+        mpc86xx_init_irq();
+
+        /*
+         * There is a simple interrupt handler in the main FPGA, this needs
+         * to be cascaded into the MPIC
+         */
+        cascade_node = of_find_compatible_node(NULL, NULL, "gef,fpga-pic");
+        if (!cascade_node) {
+                printk(KERN_WARNING "SBC610: No FPGA PIC\n");
+                return;
+        }
+
+        gef_pic_init(cascade_node);
+        of_node_put(cascade_node);
+}
+
 static void __init gef_sbc610_setup_arch(void)
 {
 #ifdef CONFIG_PCI
@@ -145,7 +168,7 @@ define_machine(gef_sbc610) {
         .name                   = "GE Fanuc SBC610",
         .probe                  = gef_sbc610_probe,
         .setup_arch             = gef_sbc610_setup_arch,
-        .init_IRQ               = mpc86xx_init_irq,
+        .init_IRQ               = gef_sbc610_init_irq,
         .show_cpuinfo           = gef_sbc610_show_cpuinfo,
         .get_irq                = mpic_get_irq,
         .restart                = fsl_rstcr_restart,