diff --git a/hw/cs4231.c b/hw/cs4231.c
index a981b094fa3aa0df934ce4d1331d15a4dbe3d07a..6d45be3ee142e4decb52f90807a184319a720c1c 100644
--- a/hw/cs4231.c
+++ b/hw/cs4231.c
@@ -21,8 +21,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-#include "hw.h"
+
 #include "sun4m.h"
+#include "sysbus.h"
 
 /* debug CS4231 */
 //#define DEBUG_CS
@@ -36,9 +37,10 @@
 #define CS_MAXDREG (CS_DREGS - 1)
 
 typedef struct CSState {
+    SysBusDevice busdev;
+    qemu_irq irq;
     uint32_t regs[CS_REGS];
     uint8_t dregs[CS_DREGS];
-    void *intctl;
 } CSState;
 
 #define CS_RAP(s) ((s)->regs[0] & CS_MAXDREG)
@@ -165,16 +167,32 @@ static int cs_load(QEMUFile *f, void *opaque, int version_id)
     return 0;
 }
 
-void cs_init(target_phys_addr_t base, int irq, void *intctl)
+static void cs4231_init1(SysBusDevice *dev)
 {
-    int cs_io_memory;
-    CSState *s;
+    int io;
+    CSState *s = FROM_SYSBUS(CSState, dev);
 
-    s = qemu_mallocz(sizeof(CSState));
+    io = cpu_register_io_memory(cs_mem_read, cs_mem_write, s);
+    sysbus_init_mmio(dev, CS_SIZE, io);
+    sysbus_init_irq(dev, &s->irq);
 
-    cs_io_memory = cpu_register_io_memory(cs_mem_read, cs_mem_write, s);
-    cpu_register_physical_memory(base, CS_SIZE, cs_io_memory);
-    register_savevm("cs4231", base, 1, cs_save, cs_load, s);
+    register_savevm("cs4231", -1, 1, cs_save, cs_load, s);
     qemu_register_reset(cs_reset, s);
     cs_reset(s);
 }
+
+static SysBusDeviceInfo cs4231_info = {
+    .init = cs4231_init1,
+    .qdev.name  = "SUNW,CS4231",
+    .qdev.size  = sizeof(CSState),
+    .qdev.props = (DevicePropList[]) {
+        {.name = NULL}
+    }
+};
+
+static void cs4231_register_devices(void)
+{
+    sysbus_register_withprop(&cs4231_info);
+}
+
+device_init(cs4231_register_devices)
diff --git a/hw/sun4m.c b/hw/sun4m.c
index f9ef2985132a1d354273cdcb815bf57787c52a2d..5d23f31ac218c3e9be36f8fe2ffa39a9b81c9872 100644
--- a/hw/sun4m.c
+++ b/hw/sun4m.c
@@ -580,8 +580,10 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef, ram_addr_t RAM_size,
              espdma_memory_read, espdma_memory_write,
              espdma, espdma_irq, esp_reset);
 
-    if (hwdef->cs_base)
-        cs_init(hwdef->cs_base, hwdef->cs_irq, slavio_intctl);
+    if (hwdef->cs_base) {
+        sysbus_create_simple("SUNW,CS4231", hwdef->cs_base,
+                             slavio_irq[hwdef->cs_irq]);
+    }
 
     kernel_size = sun4m_load_kernel(kernel_filename, initrd_filename,
                                     RAM_size);
diff --git a/hw/sun4m.h b/hw/sun4m.h
index 1dda117d8d39b23c1ae409541640245284eff934..510c6bc06bac4825470551d0a9c6f434f2fc99d1 100644
--- a/hw/sun4m.h
+++ b/hw/sun4m.h
@@ -57,9 +57,6 @@ void *slavio_misc_init(target_phys_addr_t base,
 void slavio_set_power_fail(void *opaque, int power_failing);
 void apc_init(target_phys_addr_t power_base, qemu_irq cpu_halt);
 
-/* cs4231.c */
-void cs_init(target_phys_addr_t base, int irq, void *intctl);
-
 /* sparc32_dma.c */
 #include "sparc32_dma.h"