The CCSR space is just a container which is meant to be covered by platform
device memory regions. However, QEMU only implements a subset of these devices.
Add some tracing to see which unimplemented devices a guest attempts to access.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 hw/ppc/ppce500_ccsr.c | 25 ++++++++++++++++++++++++-
 hw/ppc/trace-events   |  3 +++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/ppce500_ccsr.c b/hw/ppc/ppce500_ccsr.c
index b1fb4090c0..31efc7bee8 100644
--- a/hw/ppc/ppce500_ccsr.c
+++ b/hw/ppc/ppce500_ccsr.c
@@ -13,12 +13,35 @@
 
 #include "qemu/osdep.h"
 #include "ppce500_ccsr.h"
+#include "trace.h"
+
+static uint64_t ppce500_ccsr_io_read(void *opaque, hwaddr addr, unsigned size)
+{
+    uint64_t value = 0;
+
+    trace_ppce500_ccsr_io_read(addr, value, size);
+
+    return value;
+}
+
+static void ppce500_ccsr_io_write(void *opaque, hwaddr addr, uint64_t value,
+                                  unsigned size)
+{
+    trace_ppce500_ccsr_io_write(addr, value, size);
+}
+
+static const MemoryRegionOps ppce500_ccsr_ops = {
+    .read = ppce500_ccsr_io_read,
+    .write = ppce500_ccsr_io_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
 
 static void ppce500_ccsr_init(Object *obj)
 {
     PPCE500CCSRState *s = CCSR(obj);
 
-    memory_region_init(&s->ccsr_space, obj, "e500-ccsr", MPC85XX_CCSRBAR_SIZE);
+    memory_region_init_io(&s->ccsr_space, obj, &ppce500_ccsr_ops, obj,
+                          "e500-ccsr", MPC85XX_CCSRBAR_SIZE);
     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->ccsr_space);
 }
 
diff --git a/hw/ppc/trace-events b/hw/ppc/trace-events
index 1f125ce841..ca4c231c9f 100644
--- a/hw/ppc/trace-events
+++ b/hw/ppc/trace-events
@@ -143,6 +143,9 @@ ppc_irq_cpu(const char *action) "%s"
 ppc_dcr_read(uint32_t addr, uint32_t val) "DRCN[0x%x] -> 0x%x"
 ppc_dcr_write(uint32_t addr, uint32_t val) "DRCN[0x%x] <- 0x%x"
 
+ppce500_ccsr_io_read(uint32_t index, uint32_t val, uint8_t size) "[0x%" PRIx32 "] -> 0x%08x (size: 0x%" PRIu8 ")"
+ppce500_ccsr_io_write(uint32_t index, uint32_t val, uint8_t size) "[0x%" PRIx32 "] <- 0x%08x (size: 0x%" PRIu8 ")"
+
 # prep_systemio.c
 prep_systemio_read(uint32_t addr, uint32_t val) "read addr=0x%x val=0x%x"
 prep_systemio_write(uint32_t addr, uint32_t val) "write addr=0x%x val=0x%x"
-- 
2.47.0