@samitouri / QOSamiQemu
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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/core/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)