[Xen-devel] [PATCH v3 09/16] xen/arm: use device api to detect GIC version

[vijay.kilari@xxxxxxxxx]

From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>

Run through the device tree to detect
compatible GIC version and initialize GIC driver

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
---
 xen/arch/arm/gic-v2.c        |   26 +++++++++++++++-----------
 xen/arch/arm/gic.c           |   24 +++++++++++++++++++++++-
 xen/include/asm-arm/device.h |    3 ++-
 xen/include/asm-arm/gic.h    |    1 -
 4 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
index 7c63bae..1e62dd9 100644
--- a/xen/arch/arm/gic-v2.c
+++ b/xen/arch/arm/gic-v2.c
@@ -31,6 +31,7 @@
 #include <asm/p2m.h>
 #include <asm/domain.h>
 #include <asm/platform.h>
+#include <asm/device.h>
 
 #include <asm/gic_v2_defs.h>
 #include <asm/gic.h>
@@ -276,20 +277,10 @@ static void __cpuinit gicv2_hyp_disable(void)
 }
 
 /* Set up the GIC */
-void __init gicv2_init(void)
+int __init gicv2_init(struct dt_device_node *node, const void *data)
 {
-    static const struct dt_device_match gic_ids[] __initconst =
-    {
-        DT_MATCH_GIC,
-        { /* sentinel */ },
-    };
-    struct dt_device_node *node;
     int res;
 
-    node = dt_find_interrupt_controller(gic_ids);
-    if ( !node )
-        panic("Unable to find compatible GIC in the device tree");
-
     dt_device_set_used_by(node, DOMID_XEN);
 
     res = dt_device_get_address(node, 0, &gic.dbase, NULL);
@@ -348,6 +339,7 @@ void __init gicv2_init(void)
 
     gic_ops.hw_version = GIC_V2;
     register_gic_ops(&gic_ops);
+    return 0;
 }
 
 static void gicv2_secondary_cpu_init(void)
@@ -522,6 +514,18 @@ static struct gic_hw_operations gic_ops = {
     .read_vmcr_priority  = gicv2_read_vmcr_priority,
 };
 
+static const char * const gicv2_dt_compat[] __initconst =
+{
+    "arm,cortex-a15-gic",
+    "arm,cortex-a9-gic",
+    NULL
+};
+
+DT_DEVICE_START(gicv2, "GIC", DEVICE_GIC)
+        .compatible = gicv2_dt_compat,
+        .init = gicv2_init,
+DT_DEVICE_END
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index ce21ef6..4a86c42 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -31,6 +31,7 @@
 #include <asm/p2m.h>
 #include <asm/domain.h>
 #include <asm/platform.h>
+#include <asm/device.h>
 
 #include <asm/gic.h>
 
@@ -264,8 +265,29 @@ int gic_irq_xlate(const u32 *intspec, unsigned int intsize,
 /* Set up the GIC */
 void __init gic_init(void)
 {
-    gicv2_init();
+    int rc;
+    struct dt_device_node *node;
+    uint8_t num_gics = 0;
+
     spin_lock_init(&gic_lock);
+
+    dt_for_each_device_node(dt_host, node)
+    {
+        if ( !dt_get_property(node, "interrupt-controller", NULL) )
+            continue;
+
+        if ( !dt_get_parent(node) )
+            continue;
+
+        rc = device_init(node, DEVICE_GIC, NULL);
+        if ( !rc )
+        {
+            num_gics++;
+            break;
+        }
+    }
+    if ( !num_gics )
+        panic("Unable to find compatible GIC in the device tree");
 }
 
 void send_SGI_mask(const cpumask_t *cpumask, enum gic_sgi sgi)
diff --git a/xen/include/asm-arm/device.h b/xen/include/asm-arm/device.h
index 9e47ca6..61412e6 100644
--- a/xen/include/asm-arm/device.h
+++ b/xen/include/asm-arm/device.h
@@ -6,7 +6,8 @@
 
 enum device_type
 {
-    DEVICE_SERIAL
+    DEVICE_SERIAL,
+    DEVICE_GIC
 };
 
 struct device_desc {
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 42f0e79..2209f14 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -86,7 +86,6 @@ struct gic_lr {
 };
 
 extern int gic_hw_version(void);
-extern void gicv2_init(void);
 
 extern int domain_vgic_init(struct domain *d);
 extern void domain_vgic_free(struct domain *d);
-- 
1.7.9.5


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