irqchip/gic/realview: Support more RealView DCC variants

In the add-on file for the GIC dealing with the RealView family
we currently only handle the PB11MPCore, let's extend this to
manage the RealView EB ARM11MPCore as well. The Revision B of the
ARM11MPCore core tile is a bit special and needs special handling
as it moves a system control register around at random.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: devicetree@vger.kernel.org
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

2 files changed, 39 insertions, 6 deletions

diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt b/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
index 5a1cb4bc3dfe..793c20ff8fcc 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
+++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
@@ -16,6 +16,7 @@ Main node required properties:
         "arm,cortex-a15-gic"
         "arm,cortex-a7-gic"
         "arm,cortex-a9-gic"
+        "arm,eb11mp-gic"
         "arm,gic-400"
         "arm,pl390"
         "arm,tc11mp-gic"
diff --git a/drivers/irqchip/irq-gic-realview.c b/drivers/irqchip/irq-gic-realview.c
index aa46eb280a7f..54c296401525 100644
--- a/drivers/irqchip/irq-gic-realview.c
+++ b/drivers/irqchip/irq-gic-realview.c
@@ -10,7 +10,8 @@
 #include <linux/irqchip/arm-gic.h>
 
 #define REALVIEW_SYS_LOCK_OFFSET        0x20
-#define REALVIEW_PB11MP_SYS_PLD_CTRL1   0x74
+#define REALVIEW_SYS_PLD_CTRL1          0x74
+#define REALVIEW_EB_REVB_SYS_PLD_CTRL1  0xD8
 #define VERSATILE_LOCK_VAL              0xA05F
 #define PLD_INTMODE_MASK                BIT(22)|BIT(23)|BIT(24)
 #define PLD_INTMODE_LEGACY              0x0
@@ -18,26 +19,57 @@
 #define PLD_INTMODE_NEW_NO_DCC          BIT(23)
 #define PLD_INTMODE_FIQ_ENABLE          BIT(24)
 
+/* For some reason RealView EB Rev B moved this register */
+static const struct of_device_id syscon_pldset_of_match[] = {
+        {
+                .compatible = "arm,realview-eb11mp-revb-syscon",
+                .data = (void *)REALVIEW_EB_REVB_SYS_PLD_CTRL1,
+        },
+        {
+                .compatible = "arm,realview-eb11mp-revc-syscon",
+                .data = (void *)REALVIEW_SYS_PLD_CTRL1,
+        },
+        {
+                .compatible = "arm,realview-eb-syscon",
+                .data = (void *)REALVIEW_SYS_PLD_CTRL1,
+        },
+        {
+                .compatible = "arm,realview-pb11mp-syscon",
+                .data = (void *)REALVIEW_SYS_PLD_CTRL1,
+        },
+        {},
+};
+
 static int __init
 realview_gic_of_init(struct device_node *node, struct device_node *parent)
 {
         static struct regmap *map;
+        struct device_node *np;
+        const struct of_device_id *gic_id;
+        u32 pld1_ctrl;
+
+        np = of_find_matching_node_and_match(NULL, syscon_pldset_of_match,
+                                             &gic_id);
+        if (!np)
+                return -ENODEV;
+        pld1_ctrl = (u32)gic_id->data;
 
         /* The PB11MPCore GIC needs to be configured in the syscon */
-        map = syscon_regmap_lookup_by_compatible("arm,realview-pb11mp-syscon");
+        map = syscon_node_to_regmap(np);
         if (!IS_ERR(map)) {
                 /* new irq mode with no DCC */
                 regmap_write(map, REALVIEW_SYS_LOCK_OFFSET,
                              VERSATILE_LOCK_VAL);
-                regmap_update_bits(map, REALVIEW_PB11MP_SYS_PLD_CTRL1,
+                regmap_update_bits(map, pld1_ctrl,
                                    PLD_INTMODE_NEW_NO_DCC,
                                    PLD_INTMODE_MASK);
                 regmap_write(map, REALVIEW_SYS_LOCK_OFFSET, 0x0000);
-                pr_info("TC11MP GIC: set up interrupt controller to NEW mode, no DCC\n");
+                pr_info("RealView GIC: set up interrupt controller to NEW mode, no DCC\n");
         } else {
-                pr_err("TC11MP GIC setup: could not find syscon\n");
-                return -ENXIO;
+                pr_err("RealView GIC setup: could not find syscon\n");
+                return -ENODEV;
         }
         return gic_of_init(node, parent);
 }
 IRQCHIP_DECLARE(armtc11mp_gic, "arm,tc11mp-gic", realview_gic_of_init);
+IRQCHIP_DECLARE(armeb11mp_gic, "arm,eb11mp-gic", realview_gic_of_init);