irqchip: crossbar: Introduce ti, irqs-skip to skip irqs that bypass crossbar

When, in the system due to varied reasons, interrupts might be unusable
due to hardware behavior, but register maps do exist, then those interrupts
should be skipped while mapping irq to crossbars.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Sricharan R <r.sricharan@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Link: https://lkml.kernel.org/r/1403766634-18543-4-git-send-email-r.sricharan@ti.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/Documentation/devicetree/bindings/arm/omap/crossbar.txt b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
index fb88585cfb93a5f727c3cce40604ba10757a00ab..079576573ec0fda00b9d6ba0615ce047308fc894 100644 (file)
--- a/Documentation/devicetree/bindings/arm/omap/crossbar.txt
+++ b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
@@ -17,6 +17,11 @@ Required properties:
                 so crossbar bar driver should not consider them as free
                 lines.
 
+Optional properties:
+- ti,irqs-skip: This is similar to "ti,irqs-reserved", but these are for
+  SOC-specific hard-wiring of those irqs which unexpectedly bypasses the
+  crossbar. These irqs have a crossbar register, but still cannot be used.
+
 Examples:
                crossbar_mpu: @4a020000 {
                        compatible = "ti,irq-crossbar";
@@ -24,4 +29,5 @@ Examples:
                        ti,max-irqs = <160>;
                        ti,reg-size = <2>;
                        ti,irqs-reserved = <0 1 2 3 5 6 131 132 139 140>;
+                       ti,irqs-skip = <10 133 139 140>;
                };

diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index 51d4b878e5d62e8308018cf5301ad81668be0ebf..0533a71fa86ff6b96148550aabca20547aa39d29 100644 (file)
--- a/drivers/irqchip/irq-crossbar.c
+++ b/drivers/irqchip/irq-crossbar.c
@@ -18,6 +18,7 @@
 
 #define IRQ_FREE       -1
 #define IRQ_RESERVED   -2
+#define IRQ_SKIP       -3
 #define GIC_IRQ_START  32
 
 /*
@@ -160,6 +161,25 @@ static int __init crossbar_of_init(struct device_node *node)
                }
        }
 
+       /* Skip irqs hardwired to bypass the crossbar */
+       irqsr = of_get_property(node, "ti,irqs-skip", &size);
+       if (irqsr) {
+               size /= sizeof(__be32);
+
+               for (i = 0; i < size; i++) {
+                       of_property_read_u32_index(node,
+                                                  "ti,irqs-skip",
+                                                  i, &entry);
+                       if (entry > max) {
+                               pr_err("Invalid skip entry\n");
+                               ret = -EINVAL;
+                               goto err3;
+                       }
+                       cb->irq_map[entry] = IRQ_SKIP;
+               }
+       }
+
+
        cb->register_offsets = kzalloc(max * sizeof(int), GFP_KERNEL);
        if (!cb->register_offsets)
                goto err3;