hw/misc/arm_integrator_debug.c

   1 /*
   2  * LED, Switch and Debug control registers for ARM Integrator Boards
   3  *
   4  * This is currently a stub for this functionality but at least
   5  * ensures something other than unassigned_mem_read() handles access
   6  * to this area.
   7  *
   8  * The real h/w is described at:
   9  *  https://developer.arm.com/documentation/dui0159/b/peripherals-and-interfaces/debug-leds-and-dip-switch-interface
  10  *
  11  * Copyright (c) 2013 Alex Bennée <alex@bennee.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  14  * See the COPYING file in the top-level directory.
  15  */
  16
  17 #include "qemu/osdep.h"
  18 #include "hw/sysbus.h"
  19 #include "hw/misc/arm_integrator_debug.h"
  20 #include "qemu/log.h"
  21 #include "qemu/module.h"
  22 #include "qom/object.h"
  23
  24 OBJECT_DECLARE_SIMPLE_TYPE(IntegratorDebugState, INTEGRATOR_DEBUG)
  25
  26 struct IntegratorDebugState {
  27     SysBusDevice parent_obj;
  28
  29     MemoryRegion iomem;
  30 };
  31
  32 static uint64_t intdbg_control_read(void *opaque, hwaddr offset,
  33                                     unsigned size)
  34 {
  35     switch (offset >> 2) {
  36     case 0: /* ALPHA */
  37     case 1: /* LEDS */
  38     case 2: /* SWITCHES */
  39         qemu_log_mask(LOG_UNIMP,
  40                       "%s: returning zero from %" HWADDR_PRIx ":%u\n",
  41                       __func__, offset, size);
  42         return 0;
  43     default:
  44         qemu_log_mask(LOG_GUEST_ERROR,
  45                       "%s: Bad offset %" HWADDR_PRIx,
  46                       __func__, offset);
  47         return 0;
  48     }
  49 }
  50
  51 static void intdbg_control_write(void *opaque, hwaddr offset,
  52                                  uint64_t value, unsigned size)
  53 {
  54     switch (offset >> 2) {
  55     case 1: /* ALPHA */
  56     case 2: /* LEDS */
  57     case 3: /* SWITCHES */
  58         /* Nothing interesting implemented yet.  */
  59         qemu_log_mask(LOG_UNIMP,
  60                       "%s: ignoring write of %" PRIu64
  61                       " to %" HWADDR_PRIx ":%u\n",
  62                       __func__, value, offset, size);
  63         break;
  64     default:
  65         qemu_log_mask(LOG_GUEST_ERROR,
  66                       "%s: write of %" PRIu64
  67                       " to bad offset %" HWADDR_PRIx "\n",
  68                       __func__, value, offset);
  69     }
  70 }
  71
  72 static const MemoryRegionOps intdbg_control_ops = {
  73     .read = intdbg_control_read,
  74     .write = intdbg_control_write,
  75     .endianness = DEVICE_NATIVE_ENDIAN,
  76 };
  77
  78 static void intdbg_control_init(Object *obj)
  79 {
  80     SysBusDevice *sd = SYS_BUS_DEVICE(obj);
  81     IntegratorDebugState *s = INTEGRATOR_DEBUG(obj);
  82
  83     memory_region_init_io(&s->iomem, obj, &intdbg_control_ops,
  84                           NULL, "dbg-leds", 0x1000000);
  85     sysbus_init_mmio(sd, &s->iomem);
  86 }
  87
  88 static const TypeInfo intdbg_info = {
  89     .name          = TYPE_INTEGRATOR_DEBUG,
  90     .parent        = TYPE_SYS_BUS_DEVICE,
  91     .instance_size = sizeof(IntegratorDebugState),
  92     .instance_init = intdbg_control_init,
  93 };
  94
  95 static void intdbg_register_types(void)
  96 {
  97     type_register_static(&intdbg_info);
  98 }
  99
 100 type_init(intdbg_register_types)