[PATCH v4 08/10] arm/gic-v3: Refactor gicv3_init into generic and dt specific parts

From: Shannon Zhao <zhaoshenglong@huawei.com>
To: xen-devel@lists.xen.org
Cc: julien.grall@citrix.com, peter.huangpeng@huawei.com,
	stefano.stabellini@citrix.com, ian.campbell@citrix.com,
	shannon.zhao@linaro.org
Subject: [PATCH v4 08/10] arm/gic-v3: Refactor gicv3_init into generic and dt specific parts
Date: Sat, 16 Jan 2016 13:01:15 +0800	[thread overview]
Message-ID: <1452920477-13916-9-git-send-email-zhaoshenglong@huawei.com> (raw)
In-Reply-To: <1452920477-13916-1-git-send-email-zhaoshenglong@huawei.com>

From: Shannon Zhao <shannon.zhao@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@linaro.org>
---
v4: Use INVALID_PADDR and move ioremap to common init function
---
 xen/arch/arm/gic-v3.c | 114 +++++++++++++++++++++++++++-----------------------
 1 file changed, 61 insertions(+), 53 deletions(-)

diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index a245b56..65a4de6 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1138,41 +1138,14 @@ static int __init cmp_rdist(const void *a, const void *b)
     return ( l->base < r->base) ? -1 : 0;
 }
 
+static paddr_t __initdata dbase = INVALID_PADDR, vbase = INVALID_PADDR;
+static paddr_t __initdata cbase = INVALID_PADDR, csize = INVALID_PADDR;
+
 /* 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 )
-        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);
+    if ( cbase == INVALID_PADDR || vbase == INVALID_PADDR )
         return;
-    }
 
     printk("GICv3 compatible with GICv2 cbase %#"PRIpaddr" vbase %#"PRIpaddr"\n",
            cbase, vbase);
@@ -1180,20 +1153,12 @@ static void __init gicv3_init_v2(const struct dt_device_node *node,
     vgic_v2_setup_hw(dbase, cbase, csize, vbase, 0);
 }
 
-/* Set up the GIC */
-static int __init gicv3_init(void)
+static void __init gicv3_dt_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 )
@@ -1203,14 +1168,6 @@ static int __init gicv3_init(void)
         panic("GICv3:  Found unaligned distributor address %"PRIpaddr"",
               dbase);
 
-    gicv3.map_dbase = ioremap_nocache(dbase, SZ_64K);
-    if ( !gicv3.map_dbase )
-        panic("GICv3: Failed to ioremap for GIC distributor\n");
-
-    reg = readl_relaxed(GICD + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
-    if ( reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4 )
-         panic("GICv3: no distributor detected\n");
-
     if ( !dt_property_read_u32(node, "#redistributor-regions",
                 &gicv3.rdist_count) )
         gicv3.rdist_count = 1;
@@ -1248,6 +1205,57 @@ 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;
+    uint32_t reg;
+
+    if ( !cpu_has_gicv3 )
+    {
+        dprintk(XENLOG_ERR, "GICv3: driver requires system register support\n");
+        return -ENODEV;
+    }
+
+    gicv3_dt_init();
+
+    gicv3.map_dbase = ioremap_nocache(dbase, SZ_64K);
+    if ( !gicv3.map_dbase )
+        panic("GICv3: Failed to ioremap for GIC distributor\n");
+
+    reg = readl_relaxed(GICD + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
+    if ( reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4 )
+         panic("GICv3: no distributor detected\n");
+
     for ( i = 0; i < gicv3.rdist_count; i++ )
     {
         /* map dbase & rdist regions */
@@ -1277,7 +1285,7 @@ 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 +1325,7 @@ 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 gicv3_dt_preinit(struct dt_device_node *node, const void *data)
 {
     gicv3_info.hw_version = GIC_V3;
     gicv3_info.node = node;
@@ -1335,7 +1343,7 @@ 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 = gicv3_dt_preinit,
 DT_DEVICE_END
 
 /*
-- 
2.0.4
