[PATCH v3 22/62] arm/gic-v3: Refactor gicv3_init into generic and dt specific parts

[shannon.zhao at linaro.org]

From: Shannon Zhao <shannon.zhao at linaro.org>

Refactor gic-v3 related functions into dt and generic parts. This will be
helpful when adding acpi support for gic-v3.

Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
---
 xen/arch/arm/gic-v3.c | 95 +++++++++++++++++++++++++++------------------------
 1 file changed, 51 insertions(+), 44 deletions(-)

diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index 4fe0c37..bd13010 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1138,62 +1138,27 @@ static int __init cmp_rdist(const void *a, const void *b)
     return ( l->base < r->base) ? -1 : 0;
 }
 
+static paddr_t __initdata dbase = 0, cbase = 0, csize = 0, vbase = 0;
+
 /* If the GICv3 supports GICv2, initialize it */
-static void __init gicv3_init_v2(const struct dt_device_node *node,
-                                 paddr_t dbase)
+static void __init gicv3_init_v2(void)
 {
-    int res;
-    paddr_t cbase, csize;
-    paddr_t vbase, vsize;
-
-    /*
-     * For GICv3 supporting GICv2, GICC and GICV base address will be
-     * provided.
-     */
-    res = dt_device_get_address(node, 1 + gicv3.rdist_count,
-                                &cbase, &csize);
-    if ( res )
+    if ( cbase == 0 || vbase == 0 )
         return;
 
-    res = dt_device_get_address(node, 1 + gicv3.rdist_count + 2,
-                                &vbase, &vsize);
-    if ( res )
-        return;
-
-    /*
-     * We emulate a vGICv2 using a GIC CPU interface of GUEST_GICC_SIZE.
-     * So only support GICv2 on GICv3 when the virtual CPU interface is
-     * at least GUEST_GICC_SIZE.
-     */
-    if ( vsize < GUEST_GICC_SIZE )
-    {
-        printk(XENLOG_WARNING
-               "GICv3: WARNING: Not enabling support for GICv2 compat mode.\n"
-               "Size of GICV (%#"PRIpaddr") must at least be %#llx.\n",
-               vsize, GUEST_GICC_SIZE);
-        return;
-    }
-
     printk("GICv3 compatible with GICv2 cbase %#"PRIpaddr" vbase %#"PRIpaddr"\n",
            cbase, vbase);
 
     vgic_v2_setup_hw(dbase, cbase, csize, vbase, 0);
 }
 
-/* Set up the GIC */
-static int __init gicv3_init(void)
+static void __init dt_gicv3_init(void)
 {
     struct rdist_region *rdist_regs;
     int res, i;
     uint32_t reg;
     const struct dt_device_node *node = gicv3_info.node;
-    paddr_t dbase;
-
-    if ( !cpu_has_gicv3 )
-    {
-        dprintk(XENLOG_ERR, "GICv3: driver requires system register support\n");
-        return -ENODEV;
-    }
+    paddr_t vsize;
 
     res = dt_device_get_address(node, 0, &dbase, NULL);
     if ( res )
@@ -1248,6 +1213,48 @@ static int __init gicv3_init(void)
         panic("GICv3: Cannot find the maintenance IRQ");
     gicv3_info.maintenance_irq = res;
 
+    /*
+     * For GICv3 supporting GICv2, GICC and GICV base address will be
+     * provided.
+     */
+    res = dt_device_get_address(node, 1 + gicv3.rdist_count,
+                                &cbase, &csize);
+    if ( res )
+        return;
+
+    res = dt_device_get_address(node, 1 + gicv3.rdist_count + 2,
+                                &vbase, &vsize);
+    if ( res )
+        return;
+
+    /*
+     * We emulate a vGICv2 using a GIC CPU interface of GUEST_GICC_SIZE.
+     * So only support GICv2 on GICv3 when the virtual CPU interface is
+     * at least GUEST_GICC_SIZE.
+     */
+    if ( vsize < GUEST_GICC_SIZE )
+    {
+        printk(XENLOG_WARNING
+               "GICv3: WARNING: Not enabling support for GICv2 compat mode.\n"
+               "Size of GICV (%#"PRIpaddr") must at least be %#llx.\n",
+               vsize, GUEST_GICC_SIZE);
+        return;
+    }
+}
+
+/* Set up the GIC */
+static int __init gicv3_init(void)
+{
+    int res, i;
+
+    if ( !cpu_has_gicv3 )
+    {
+        dprintk(XENLOG_ERR, "GICv3: driver requires system register support\n");
+        return -ENODEV;
+    }
+
+    dt_gicv3_init();
+
     for ( i = 0; i < gicv3.rdist_count; i++ )
     {
         /* map dbase & rdist regions */
@@ -1277,7 +1284,7 @@ static int __init gicv3_init(void)
 
     vgic_v3_setup_hw(dbase, gicv3.rdist_count, gicv3.rdist_regions,
                      gicv3.rdist_stride);
-    gicv3_init_v2(node, dbase);
+    gicv3_init_v2();
 
     spin_lock_init(&gicv3.lock);
 
@@ -1317,7 +1324,7 @@ static const struct gic_hw_operations gicv3_ops = {
     .make_hwdom_dt_node  = gicv3_make_hwdom_dt_node,
 };
 
-static int __init gicv3_preinit(struct dt_device_node *node, const void *data)
+static int __init dt_gicv3_preinit(struct dt_device_node *node, const void *data)
 {
     gicv3_info.hw_version = GIC_V3;
     gicv3_info.node = node;
@@ -1335,7 +1342,7 @@ static const struct dt_device_match gicv3_dt_match[] __initconst =
 
 DT_DEVICE_START(gicv3, "GICv3", DEVICE_GIC)
         .dt_match = gicv3_dt_match,
-        .init = gicv3_preinit,
+        .init = dt_gicv3_preinit,
 DT_DEVICE_END
 
 /*
-- 
2.1.0