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  *  http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0159b/Babbfijf.html
  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/hw.h"
  19 #include "hw/sysbus.h"
  20 #include "exec/address-spaces.h"
  21 #include "hw/misc/arm_integrator_debug.h"
  22 #include "qemu/log.h"
  23
  24 #define INTEGRATOR_DEBUG(obj) \
  25     OBJECT_CHECK(IntegratorDebugState, (obj), TYPE_INTEGRATOR_DEBUG)
  26
  27 typedef struct {
  28     SysBusDevice parent_obj;
  29
  30     MemoryRegion iomem;
  31 } IntegratorDebugState;
  32
  33 static uint64_t intdbg_control_read(void *opaque, hwaddr offset,
  34                                     unsigned size)
  35 {
  36     switch (offset >> 2) {
  37     case 0: /* ALPHA */
  38     case 1: /* LEDS */
  39     case 2: /* SWITCHES */
  40         qemu_log_mask(LOG_UNIMP,
  41                       "%s: returning zero from %" HWADDR_PRIx ":%u\n",
  42                       __func__, offset, size);
  43         return 0;
  44     default:
  45         qemu_log_mask(LOG_GUEST_ERROR,
  46                       "%s: Bad offset %" HWADDR_PRIx,
  47                       __func__, offset);
  48         return 0;
  49     }
  50 }
  51
  52 static void intdbg_control_write(void *opaque, hwaddr offset,
  53                                  uint64_t value, unsigned size)
  54 {
  55     switch (offset >> 2) {
  56     case 1: /* ALPHA */
  57     case 2: /* LEDS */
  58     case 3: /* SWITCHES */
  59         /* Nothing interesting implemented yet.  */
  60         qemu_log_mask(LOG_UNIMP,
  61                       "%s: ignoring write of %" PRIu64
  62                       " to %" HWADDR_PRIx ":%u\n",
  63                       __func__, value, offset, size);
  64         break;
  65     default:
  66         qemu_log_mask(LOG_GUEST_ERROR,
  67                       "%s: write of %" PRIu64
  68                       " to bad offset %" HWADDR_PRIx "\n",
  69                       __func__, value, offset);
  70     }
  71 }
  72
  73 static const MemoryRegionOps intdbg_control_ops = {
  74     .read = intdbg_control_read,
  75     .write = intdbg_control_write,
  76     .endianness = DEVICE_NATIVE_ENDIAN,
  77 };
  78
  79 static void intdbg_control_init(Object *obj)
  80 {
  81     SysBusDevice *sd = SYS_BUS_DEVICE(obj);
  82     IntegratorDebugState *s = INTEGRATOR_DEBUG(obj);
  83
  84     memory_region_init_io(&s->iomem, obj, &intdbg_control_ops,
  85                           NULL, "dbg-leds", 0x1000000);
  86     sysbus_init_mmio(sd, &s->iomem);
  87 }
  88
  89 static const TypeInfo intdbg_info = {
  90     .name          = TYPE_INTEGRATOR_DEBUG,
  91     .parent        = TYPE_SYS_BUS_DEVICE,
  92     .instance_size = sizeof(IntegratorDebugState),
  93     .instance_init = intdbg_control_init,
  94 };
  95
  96 static void intdbg_register_types(void)
  97 {
  98     type_register_static(&intdbg_info);
  99 }
 100
 101 type_init(intdbg_register_types)