1 files changed, 174 insertions, 0 deletions
diff --git a/hw/arm/sysbus-fdt.c b/hw/arm/sysbus-fdt.c
new file mode 100644
index 0000000000..3038b94b4a
--- /dev/null
+++ b/hw/arm/sysbus-fdt.c
@@ -0,0 +1,174 @@
+/*
+ * ARM Platform Bus device tree generation helpers
+ *
+ * Copyright (c) 2014 Linaro Limited
+ *
+ * Authors:
+ *  Alex Graf <agraf@suse.de>
+ *  Eric Auger <eric.auger@linaro.org>
+ *
+ * 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/>.
+ *
+ */
+
+#include "hw/arm/sysbus-fdt.h"
+#include "qemu/error-report.h"
+#include "sysemu/device_tree.h"
+#include "hw/platform-bus.h"
+#include "sysemu/sysemu.h"
+
+/*
+ * internal struct that contains the information to create dynamic
+ * sysbus device node
+ */
+typedef struct PlatformBusFDTData {
+    void *fdt; /* device tree handle */
+    int irq_start; /* index of the first IRQ usable by platform bus devices */
+    const char *pbus_node_name; /* name of the platform bus node */
+    PlatformBusDevice *pbus;
+} PlatformBusFDTData;
+
+/*
+ * struct used when calling the machine init done notifier
+ * that constructs the fdt nodes of platform bus devices
+ */
+typedef struct PlatformBusFDTNotifierParams {
+    Notifier notifier;
+    ARMPlatformBusFDTParams *fdt_params;
+} PlatformBusFDTNotifierParams;
+
+/* struct that associates a device type name and a node creation function */
+typedef struct NodeCreationPair {
+    const char *typename;
+    int (*add_fdt_node_fn)(SysBusDevice *sbdev, void *opaque);
+} NodeCreationPair;
+
+/* list of supported dynamic sysbus devices */
+static const NodeCreationPair add_fdt_node_functions[] = {
+    {"", NULL}, /* last element */
+};
+
+/**
+ * add_fdt_node - add the device tree node of a dynamic sysbus device
+ *
+ * @sbdev: handle to the sysbus device
+ * @opaque: handle to the PlatformBusFDTData
+ *
+ * Checks the sysbus type belongs to the list of device types that
+ * are dynamically instantiable and if so call the node creation
+ * function.
+ */
+static int add_fdt_node(SysBusDevice *sbdev, void *opaque)
+{
+    int i, ret;
+
+    for (i = 0; i < ARRAY_SIZE(add_fdt_node_functions); i++) {
+        if (!strcmp(object_get_typename(OBJECT(sbdev)),
+                    add_fdt_node_functions[i].typename)) {
+            ret = add_fdt_node_functions[i].add_fdt_node_fn(sbdev, opaque);
+            assert(!ret);
+            return 0;
+        }
+    }
+    error_report("Device %s can not be dynamically instantiated",
+                     qdev_fw_name(DEVICE(sbdev)));
+    exit(1);
+}
+
+/**
+ * add_all_platform_bus_fdt_nodes - create all the platform bus nodes
+ *
+ * builds the parent platform bus node and all the nodes of dynamic
+ * sysbus devices attached to it.
+ */
+static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
+{
+    const char platcomp[] = "qemu,platform\0simple-bus";
+    PlatformBusDevice *pbus;
+    DeviceState *dev;
+    gchar *node;
+    uint64_t addr, size;
+    int irq_start, dtb_size;
+    struct arm_boot_info *info = fdt_params->binfo;
+    const ARMPlatformBusSystemParams *params = fdt_params->system_params;
+    const char *intc = fdt_params->intc;
+    void *fdt = info->get_dtb(info, &dtb_size);
+
+    /*
+     * If the user provided a dtb, we assume the dynamic sysbus nodes
+     * already are integrated there. This corresponds to a use case where
+     * the dynamic sysbus nodes are complex and their generation is not yet
+     * supported. In that case the user can take charge of the guest dt
+     * while qemu takes charge of the qom stuff.
+     */
+    if (info->dtb_filename) {
+        return;
+    }
+
+    assert(fdt);
+
+    node = g_strdup_printf("/platform@%"PRIx64, params->platform_bus_base);
+    addr = params->platform_bus_base;
+    size = params->platform_bus_size;
+    irq_start = params->platform_bus_first_irq;
+
+    /* Create a /platform node that we can put all devices into */
+    qemu_fdt_add_subnode(fdt, node);
+    qemu_fdt_setprop(fdt, node, "compatible", platcomp, sizeof(platcomp));
+
+    /* Our platform bus region is less than 32bits, so 1 cell is enough for
+     * address and size
+     */
+    qemu_fdt_setprop_cells(fdt, node, "#size-cells", 1);
+    qemu_fdt_setprop_cells(fdt, node, "#address-cells", 1);
+    qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, size);
+
+    qemu_fdt_setprop_phandle(fdt, node, "interrupt-parent", intc);
+
+    dev = qdev_find_recursive(sysbus_get_default(), TYPE_PLATFORM_BUS_DEVICE);
+    pbus = PLATFORM_BUS_DEVICE(dev);
+
+    /* We can only create dt nodes for dynamic devices when they're ready */
+    assert(pbus->done_gathering);
+
+    PlatformBusFDTData data = {
+        .fdt = fdt,
+        .irq_start = irq_start,
+        .pbus_node_name = node,
+        .pbus = pbus,
+    };
+
+    /* Loop through all dynamic sysbus devices and create their node */
+    foreach_dynamic_sysbus_device(add_fdt_node, &data);
+
+    g_free(node);
+}
+
+static void platform_bus_fdt_notify(Notifier *notifier, void *data)
+{
+    PlatformBusFDTNotifierParams *p = DO_UPCAST(PlatformBusFDTNotifierParams,
+                                                notifier, notifier);
+
+    add_all_platform_bus_fdt_nodes(p->fdt_params);
+    g_free(p->fdt_params);
+    g_free(p);
+}
+
+void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params)
+{
+    PlatformBusFDTNotifierParams *p = g_new(PlatformBusFDTNotifierParams, 1);
+
+    p->fdt_params = fdt_params;
+    p->notifier.notify = platform_bus_fdt_notify;
+    qemu_add_machine_init_done_notifier(&p->notifier);
+}