hw/arm/sysbus-fdt: enable vfio-calxeda-xgmac dynamic instantiation

This patch allows the instantiation of the vfio-calxeda-xgmac device
from the QEMU command line (-device vfio-calxeda-xgmac,host="<device>").

A specialized device tree node is created for the guest, containing
compat, dma-coherent, reg and interrupts properties.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1434455898-17895-1-git-send-email-eric.auger@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/sysbus-fdt.c

@@ -26,6 +26,9 @@
 #include "sysemu/device_tree.h"
 #include "hw/platform-bus.h"
 #include "sysemu/sysemu.h"
+#include "hw/vfio/vfio-platform.h"
+#include "hw/vfio/vfio-calxeda-xgmac.h"
+#include "hw/arm/fdt.h"
 
 /*
  * internal struct that contains the information to create dynamic
@@ -53,11 +56,81 @@ typedef struct NodeCreationPair {
     int (*add_fdt_node_fn)(SysBusDevice *sbdev, void *opaque);
 } NodeCreationPair;
 
+/* Device Specific Code */
+
+/**
+ * add_calxeda_midway_xgmac_fdt_node
+ *
+ * Generates a simple node with following properties:
+ * compatible string, regs, interrupts, dma-coherent
+ */
+static int add_calxeda_midway_xgmac_fdt_node(SysBusDevice *sbdev, void *opaque)
+{
+    PlatformBusFDTData *data = opaque;
+    PlatformBusDevice *pbus = data->pbus;
+    void *fdt = data->fdt;
+    const char *parent_node = data->pbus_node_name;
+    int compat_str_len, i, ret = -1;
+    char *nodename;
+    uint32_t *irq_attr, *reg_attr;
+    uint64_t mmio_base, irq_number;
+    VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+
+    mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
+    nodename = g_strdup_printf("%s/%s@%" PRIx64, parent_node,
+                               vbasedev->name, mmio_base);
+    qemu_fdt_add_subnode(fdt, nodename);
+
+    compat_str_len = strlen(vdev->compat) + 1;
+    qemu_fdt_setprop(fdt, nodename, "compatible",
+                          vdev->compat, compat_str_len);
+
+    qemu_fdt_setprop(fdt, nodename, "dma-coherent", "", 0);
+
+    reg_attr = g_new(uint32_t, vbasedev->num_regions * 2);
+    for (i = 0; i < vbasedev->num_regions; i++) {
+        mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, i);
+        reg_attr[2 * i] = cpu_to_be32(mmio_base);
+        reg_attr[2 * i + 1] = cpu_to_be32(
+                                memory_region_size(&vdev->regions[i]->mem));
+    }
+    ret = qemu_fdt_setprop(fdt, nodename, "reg", reg_attr,
+                           vbasedev->num_regions * 2 * sizeof(uint32_t));
+    if (ret) {
+        error_report("could not set reg property of node %s", nodename);
+        goto fail_reg;
+    }
+
+    irq_attr = g_new(uint32_t, vbasedev->num_irqs * 3);
+    for (i = 0; i < vbasedev->num_irqs; i++) {
+        irq_number = platform_bus_get_irqn(pbus, sbdev , i)
+                         + data->irq_start;
+        irq_attr[3 * i] = cpu_to_be32(GIC_FDT_IRQ_TYPE_SPI);
+        irq_attr[3 * i + 1] = cpu_to_be32(irq_number);
+        irq_attr[3 * i + 2] = cpu_to_be32(GIC_FDT_IRQ_FLAGS_LEVEL_HI);
+    }
+    ret = qemu_fdt_setprop(fdt, nodename, "interrupts",
+                     irq_attr, vbasedev->num_irqs * 3 * sizeof(uint32_t));
+    if (ret) {
+        error_report("could not set interrupts property of node %s",
+                     nodename);
+    }
+    g_free(irq_attr);
+fail_reg:
+    g_free(reg_attr);
+    g_free(nodename);
+    return ret;
+}
+
 /* list of supported dynamic sysbus devices */
 static const NodeCreationPair add_fdt_node_functions[] = {
+    {TYPE_VFIO_CALXEDA_XGMAC, add_calxeda_midway_xgmac_fdt_node},
     {"", NULL}, /* last element */
 };
 
+/* Generic Code */
+
 /**
  * add_fdt_node - add the device tree node of a dynamic sysbus device
  *

hw/arm/virt.c

@@ -47,21 +47,11 @@
 #include "hw/arm/virt-acpi-build.h"
 #include "hw/arm/sysbus-fdt.h"
 #include "hw/platform-bus.h"
+#include "hw/arm/fdt.h"
 
 /* Number of external interrupt lines to configure the GIC with */
 #define NUM_IRQS 256
 
-#define GIC_FDT_IRQ_TYPE_SPI 0
-#define GIC_FDT_IRQ_TYPE_PPI 1
-
-#define GIC_FDT_IRQ_FLAGS_EDGE_LO_HI 1
-#define GIC_FDT_IRQ_FLAGS_EDGE_HI_LO 2
-#define GIC_FDT_IRQ_FLAGS_LEVEL_HI 4
-#define GIC_FDT_IRQ_FLAGS_LEVEL_LO 8
-
-#define GIC_FDT_IRQ_PPI_CPU_START 8
-#define GIC_FDT_IRQ_PPI_CPU_WIDTH 8
-
 #define PLATFORM_BUS_NUM_IRQS 64
 
 static ARMPlatformBusSystemParams platform_bus_params;

include/hw/arm/fdt.h

@@ -0,0 +1,34 @@
+/*
+ *
+ * Copyright (c) 2015 Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Define macros useful when building ARM device tree nodes
+ */
+
+#ifndef QEMU_ARM_FDT_H
+#define QEMU_ARM_FDT_H
+
+#define GIC_FDT_IRQ_TYPE_SPI 0
+#define GIC_FDT_IRQ_TYPE_PPI 1
+
+#define GIC_FDT_IRQ_FLAGS_EDGE_LO_HI 1
+#define GIC_FDT_IRQ_FLAGS_EDGE_HI_LO 2
+#define GIC_FDT_IRQ_FLAGS_LEVEL_HI 4
+#define GIC_FDT_IRQ_FLAGS_LEVEL_LO 8
+
+#define GIC_FDT_IRQ_PPI_CPU_START 8
+#define GIC_FDT_IRQ_PPI_CPU_WIDTH 8
+
+#endif