hw/arm/mps2: Add CMSDK AHB GPIO peripherals as unimplemented devices

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)

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20200617072539.32686-10-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/hw/arm/mps2.c b/hw/arm/mps2.c
index f7bef20..c66c595 100644
--- a/hw/arm/mps2.c
+++ b/hw/arm/mps2.c
@@ -113,6 +113,7 @@ 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);
@@ -301,6 +300,11 @@ static void mps2_common_init(MachineState *machine)
     default:
         g_assert_not_reached();
     }
+    for (i = 0; i < 4; i++) {
+        static const hwaddr gpiobase[] = {0x40010000, 0x40011000,
+                                          0x40012000, 0x40013000};
+        create_unimplemented_device("cmsdk-ahb-gpio", gpiobase[i], 0x1000);
+    }
 
     /* CMSDK APB subsystem */
     cmsdk_apb_timer_create(0x40000000, qdev_get_gpio_in(armv7m, 8), SYSCLK_FRQ);