[PATCH 06/20] hw/net/xilinx_ethlite: Map MDIO registers (as unimplemented)

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Rather than handling the MDIO registers as RAM, map them
as unimplemented I/O within the device MR.

The memory flat view becomes:

  (qemu) info mtree -f
  FlatView #0
   Root memory region: system
    0000000081000000-00000000810007e3 (prio 0, i/o): xlnx.xps-ethernetlite
    00000000810007e4-00000000810007f3 (prio 0, i/o): ethlite.mdio
    00000000810007f4-0000000081001fff (prio 0, i/o): xlnx.xps-ethernetlite @00000000000007f4

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/net/xilinx_ethlite.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/hw/net/xilinx_ethlite.c b/hw/net/xilinx_ethlite.c
index e6f6179fce..76b1e7d826 100644
--- a/hw/net/xilinx_ethlite.c
+++ b/hw/net/xilinx_ethlite.c
@@ -25,13 +25,17 @@
 #include "qemu/osdep.h"
 #include "qemu/module.h"
 #include "qom/object.h"
+#include "qapi/error.h"
 #include "exec/tswap.h"
 #include "hw/sysbus.h"
 #include "hw/irq.h"
 #include "hw/qdev-properties.h"
+#include "hw/misc/unimp.h"
 #include "net/net.h"
 #include "trace.h"
 
+#define A_MDIO_BASE   0x07e4
+
 #define R_TX_BUF0     0
 #define R_TX_LEN0     (0x07f4 / 4)
 #define R_TX_GIE0     (0x07f8 / 4)
@@ -71,6 +75,7 @@ struct XlnxXpsEthLite
     unsigned int txbuf;
     unsigned int rxbuf;
 
+    UnimplementedDeviceState mdio;
     uint32_t regs[R_MAX];
 };
 
@@ -231,6 +236,14 @@ static void xilinx_ethlite_realize(DeviceState *dev, Error **errp)
 {
     XlnxXpsEthLite *s = XILINX_ETHLITE(dev);
 
+    object_initialize_child(OBJECT(dev), "ethlite.mdio", &s->mdio,
+                           TYPE_UNIMPLEMENTED_DEVICE);
+    qdev_prop_set_string(DEVICE(&s->mdio), "name", "ethlite.mdio");
+    qdev_prop_set_uint64(DEVICE(&s->mdio), "size", 4 * 4);
+    sysbus_realize(SYS_BUS_DEVICE(&s->mdio), &error_fatal);
+    memory_region_add_subregion(&s->mmio, A_MDIO_BASE,
+                            sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->mdio), 0));
+
     qemu_macaddr_default_if_unset(&s->conf.macaddr);
     s->nic = qemu_new_nic(&net_xilinx_ethlite_info, &s->conf,
                           object_get_typename(OBJECT(dev)), dev->id,
-- 
2.45.2