[Qemu-devel] [RFC v2 2/7] hw/arm/dyn_sysbus_devtree: helpers for sysbus device dynamic dt node generation

[Eric Auger <eric.auger@linaro.org>]

This module will be used by ARM machine files to generate
device tree nodes of dynamically instantiated sysbus devices (ie.
those instantiated with -device option).

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Eric Auger <eric.auger@linaro.org>

---

v2:
- Code moved in an arch specific file to accomodate architecture
  dependent specificities.
- remove platform_bus_base from PlatformDevtreeData

v1: code originally written by Alex Graf in e500.c and reused for ARM
    [Eric Auger]
    code originally moved in hw/misc/platform_devices and device itself
---
 hw/arm/Makefile.objs                |  1 +
 hw/arm/dyn_sysbus_devtree.c         | 66 +++++++++++++++++++++++++++++++++++++
 include/hw/arm/dyn_sysbus_devtree.h | 18 ++++++++++
 3 files changed, 85 insertions(+)
 create mode 100644 hw/arm/dyn_sysbus_devtree.c
 create mode 100644 include/hw/arm/dyn_sysbus_devtree.h

diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
index 6088e53..bc5e014 100644
--- a/hw/arm/Makefile.objs
+++ b/hw/arm/Makefile.objs
@@ -3,6 +3,7 @@ obj-$(CONFIG_DIGIC) += digic_boards.o
 obj-y += integratorcp.o kzm.o mainstone.o musicpal.o nseries.o
 obj-y += omap_sx1.o palm.o realview.o spitz.o stellaris.o
 obj-y += tosa.o versatilepb.o vexpress.o virt.o xilinx_zynq.o z2.o
+obj-y += dyn_sysbus_devtree.o
 
 obj-y += armv7m.o exynos4210.o pxa2xx.o pxa2xx_gpio.o pxa2xx_pic.o
 obj-$(CONFIG_DIGIC) += digic.o
diff --git a/hw/arm/dyn_sysbus_devtree.c b/hw/arm/dyn_sysbus_devtree.c
new file mode 100644
index 0000000..56af62f
--- /dev/null
+++ b/hw/arm/dyn_sysbus_devtree.c
@@ -0,0 +1,66 @@
+#include "hw/arm/dyn_sysbus_devtree.h"
+#include "qemu/error-report.h"
+#include "sysemu/device_tree.h"
+
+int sysbus_device_create_devtree(Object *obj, void *opaque)
+{
+    PlatformDevtreeData *data = opaque;
+    Object *dev;
+    SysBusDevice *sbdev;
+    bool matched = false;
+
+    dev = object_dynamic_cast(obj, TYPE_SYS_BUS_DEVICE);
+    sbdev = (SysBusDevice *)dev;
+
+    if (!sbdev) {
+        /* Container, traverse it for children */
+        return object_child_foreach(obj, sysbus_device_create_devtree, data);
+    }
+
+    if (!matched) {
+        error_report("Device %s is not supported by this machine yet.",
+                     qdev_fw_name(DEVICE(dev)));
+        exit(1);
+    }
+
+    return 0;
+}
+
+void platform_bus_create_devtree(DynSysbusParams *params,
+                                 void *fdt, const char *mpic)
+{
+    gchar *node = g_strdup_printf("/platform@%"PRIx64,
+                                  params->platform_bus_base);
+    const char platcomp[] = "qemu,platform\0simple-bus";
+    PlatformDevtreeData data;
+    Object *container;
+    uint64_t addr = params->platform_bus_base;
+    uint64_t size = params->platform_bus_size;
+    int 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 32bit big, 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", mpic);
+
+    /* Loop through all devices and create nodes for known ones */
+    data.fdt = fdt;
+    data.mpic = mpic;
+    data.irq_start = irq_start;
+    data.node = node;
+
+    container = container_get(qdev_get_machine(), "/peripheral");
+    sysbus_device_create_devtree(container, &data);
+    container = container_get(qdev_get_machine(), "/peripheral-anon");
+    sysbus_device_create_devtree(container, &data);
+
+    g_free(node);
+}
diff --git a/include/hw/arm/dyn_sysbus_devtree.h b/include/hw/arm/dyn_sysbus_devtree.h
new file mode 100644
index 0000000..808d522
--- /dev/null
+++ b/include/hw/arm/dyn_sysbus_devtree.h
@@ -0,0 +1,18 @@
+#ifndef HW_ARM_DYN_SYSBUS_DEVTREE_H
+#define HW_ARM_DYN_SYSBUS_DEVTREE_H
+
+#include "hw/misc/dyn_sysbus_binding.h"
+
+typedef struct PlatformDevtreeData {
+    void *fdt;
+    const char *mpic;
+    int irq_start;
+    const char *node;
+} PlatformDevtreeData;
+
+int sysbus_device_create_devtree(Object *obj, void *opaque);
+
+void platform_bus_create_devtree(DynSysbusParams *params,
+                                 void *fdt, const char *mpic);
+
+#endif
-- 
1.8.3.2