[PATCH 4/7] hw/arm/mps2: Add CMSDK AHB GPIO peripherals as unimplemented devices

[Philippe Mathieu-Daudé]

Register the GPIO peripherals as unimplemented to better
follow their accesses, for example booting Zephyr:

  ----------------
  IN: arm_mps2_pinmux_init
  0x00001160:  f64f 0231  movw     r2, #0xf831
  0x00001164:  4b06       ldr      r3, [pc, #0x18]
  0x00001166:  2000       movs     r0, #0
  0x00001168:  619a       str      r2, [r3, #0x18]
  0x0000116a:  f24c 426f  movw     r2, #0xc46f
  0x0000116e:  f503 5380  add.w    r3, r3, #0x1000
  0x00001172:  619a       str      r2, [r3, #0x18]
  0x00001174:  f44f 529e  mov.w    r2, #0x13c0
  0x00001178:  f503 5380  add.w    r3, r3, #0x1000
  0x0000117c:  619a       str      r2, [r3, #0x18]
  0x0000117e:  4770       bx       lr
  cmsdk-ahb-gpio: unimplemented device write (size 4, value 0xf831, offset 0x18)
  cmsdk-ahb-gpio: unimplemented device write (size 4, value 0xc46f, offset 0x18)
  cmsdk-ahb-gpio: unimplemented device write (size 4, value 0x13c0, offset 0x18)

Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
 hw/arm/mps2.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/arm/mps2.c b/hw/arm/mps2.c
index 570ec50aa8..4a49bfa9b9 100644
--- a/hw/arm/mps2.c
+++ b/hw/arm/mps2.c
@@ -111,6 +111,7 @@ static void mps2_common_init(MachineState *machine)
     MemoryRegion *system_memory = get_system_memory();
     MachineClass *mc = MACHINE_GET_CLASS(machine);
     DeviceState *armv7m, *sccdev;
+    int i;
 
     if (strcmp(machine->cpu_type, mc->default_cpu_type) != 0) {
         error_report("This board can only be used with CPU %s",
@@ -228,7 +229,6 @@ static void mps2_common_init(MachineState *machine)
          */
         Object *orgate;
         DeviceState *orgate_dev;
-        int i;
 
         orgate = object_new(TYPE_OR_IRQ);
         object_property_set_int(orgate, 6, "num-lines", &error_fatal);
@@ -265,7 +265,6 @@ static void mps2_common_init(MachineState *machine)
          */
         Object *orgate;
         DeviceState *orgate_dev;
-        int i;
 
         orgate = object_new(TYPE_OR_IRQ);
         object_property_set_int(orgate, 10, "num-lines", &error_fatal);
@@ -315,6 +314,12 @@ static void mps2_common_init(MachineState *machine)
                        qdev_get_gpio_in(armv7m, 10));
     sysbus_mmio_map(SYS_BUS_DEVICE(&mms->dualtimer), 0, 0x40002000);
     create_unimplemented_device("cmsdk-apb-watchdog", 0x40008000, 0x1000);
+    for (i = 0; i < 4; i++) {
+        static const hwaddr gpiobase[] = {0x40010000, 0x40011000,
+                                          0x40012000, 0x40013000};
+
+        create_unimplemented_device("cmsdk-ahb-gpio", gpiobase[i], 0x1000);
+    }
 
     sysbus_init_child_obj(OBJECT(mms), "scc", &mms->scc,
                           sizeof(mms->scc), TYPE_MPS2_SCC);
-- 
2.21.3