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25#include "qemu/osdep.h"
26#include "hw/hw.h"
27#include "hw/isa/isa.h"
28#include "hw/audio/soundhw.h"
29#include "audio/audio.h"
30#include "qemu/timer.h"
31#include "hw/timer/i8254.h"
32#include "hw/audio/pcspk.h"
33#include "qapi/error.h"
34
35#define PCSPK_BUF_LEN 1792
36#define PCSPK_SAMPLE_RATE 32000
37#define PCSPK_MAX_FREQ (PCSPK_SAMPLE_RATE >> 1)
38#define PCSPK_MIN_COUNT DIV_ROUND_UP(PIT_FREQ, PCSPK_MAX_FREQ)
39
40#define PC_SPEAKER(obj) OBJECT_CHECK(PCSpkState, (obj), TYPE_PC_SPEAKER)
41
42typedef struct {
43 ISADevice parent_obj;
44
45 MemoryRegion ioport;
46 uint32_t iobase;
47 uint8_t sample_buf[PCSPK_BUF_LEN];
48 QEMUSoundCard card;
49 SWVoiceOut *voice;
50 void *pit;
51 unsigned int pit_count;
52 unsigned int samples;
53 unsigned int play_pos;
54 uint8_t data_on;
55 uint8_t dummy_refresh_clock;
56 bool migrate;
57} PCSpkState;
58
59static const char *s_spk = "pcspk";
60static PCSpkState *pcspk_state;
61
62static inline void generate_samples(PCSpkState *s)
63{
64 unsigned int i;
65
66 if (s->pit_count) {
67 const uint32_t m = PCSPK_SAMPLE_RATE * s->pit_count;
68 const uint32_t n = ((uint64_t)PIT_FREQ << 32) / m;
69
70
71 s->samples = (QEMU_ALIGN_DOWN(PCSPK_BUF_LEN * PIT_FREQ, m) / (PIT_FREQ >> 1) + 1) >> 1;
72 for (i = 0; i < s->samples; ++i)
73 s->sample_buf[i] = (64 & (n * i >> 25)) - 32;
74 } else {
75 s->samples = PCSPK_BUF_LEN;
76 for (i = 0; i < PCSPK_BUF_LEN; ++i)
77 s->sample_buf[i] = 128;
78 }
79}
80
81static void pcspk_callback(void *opaque, int free)
82{
83 PCSpkState *s = opaque;
84 PITChannelInfo ch;
85 unsigned int n;
86
87 pit_get_channel_info(s->pit, 2, &ch);
88
89 if (ch.mode != 3) {
90 return;
91 }
92
93 n = ch.initial_count;
94
95 if (n < PCSPK_MIN_COUNT)
96 n = 0;
97
98 if (s->pit_count != n) {
99 s->pit_count = n;
100 s->play_pos = 0;
101 generate_samples(s);
102 }
103
104 while (free > 0) {
105 n = audio_MIN(s->samples - s->play_pos, (unsigned int)free);
106 n = AUD_write(s->voice, &s->sample_buf[s->play_pos], n);
107 if (!n)
108 break;
109 s->play_pos = (s->play_pos + n) % s->samples;
110 free -= n;
111 }
112}
113
114static int pcspk_audio_init(ISABus *bus)
115{
116 PCSpkState *s = pcspk_state;
117 struct audsettings as = {PCSPK_SAMPLE_RATE, 1, AUD_FMT_U8, 0};
118
119 AUD_register_card(s_spk, &s->card);
120
121 s->voice = AUD_open_out(&s->card, s->voice, s_spk, s, pcspk_callback, &as);
122 if (!s->voice) {
123 AUD_log(s_spk, "Could not open voice\n");
124 return -1;
125 }
126
127 return 0;
128}
129
130static uint64_t pcspk_io_read(void *opaque, hwaddr addr,
131 unsigned size)
132{
133 PCSpkState *s = opaque;
134 PITChannelInfo ch;
135
136 pit_get_channel_info(s->pit, 2, &ch);
137
138 s->dummy_refresh_clock ^= (1 << 4);
139
140 return ch.gate | (s->data_on << 1) | s->dummy_refresh_clock |
141 (ch.out << 5);
142}
143
144static void pcspk_io_write(void *opaque, hwaddr addr, uint64_t val,
145 unsigned size)
146{
147 PCSpkState *s = opaque;
148 const int gate = val & 1;
149
150 s->data_on = (val >> 1) & 1;
151 pit_set_gate(s->pit, 2, gate);
152 if (s->voice) {
153 if (gate)
154 s->play_pos = 0;
155 AUD_set_active_out(s->voice, gate & s->data_on);
156 }
157}
158
159static const MemoryRegionOps pcspk_io_ops = {
160 .read = pcspk_io_read,
161 .write = pcspk_io_write,
162 .impl = {
163 .min_access_size = 1,
164 .max_access_size = 1,
165 },
166};
167
168static void pcspk_initfn(Object *obj)
169{
170 PCSpkState *s = PC_SPEAKER(obj);
171
172 memory_region_init_io(&s->ioport, OBJECT(s), &pcspk_io_ops, s, "pcspk", 1);
173
174 object_property_add_link(obj, "pit", TYPE_PIT_COMMON,
175 (Object **)&s->pit,
176 qdev_prop_allow_set_link_before_realize,
177 0, &error_abort);
178}
179
180static void pcspk_realizefn(DeviceState *dev, Error **errp)
181{
182 ISADevice *isadev = ISA_DEVICE(dev);
183 PCSpkState *s = PC_SPEAKER(dev);
184
185 isa_register_ioport(isadev, &s->ioport, s->iobase);
186
187 pcspk_state = s;
188}
189
190static bool migrate_needed(void *opaque)
191{
192 PCSpkState *s = opaque;
193
194 return s->migrate;
195}
196
197static const VMStateDescription vmstate_spk = {
198 .name = "pcspk",
199 .version_id = 1,
200 .minimum_version_id = 1,
201 .minimum_version_id_old = 1,
202 .needed = migrate_needed,
203 .fields = (VMStateField[]) {
204 VMSTATE_UINT8(data_on, PCSpkState),
205 VMSTATE_UINT8(dummy_refresh_clock, PCSpkState),
206 VMSTATE_END_OF_LIST()
207 }
208};
209
210static Property pcspk_properties[] = {
211 DEFINE_PROP_UINT32("iobase", PCSpkState, iobase, -1),
212 DEFINE_PROP_BOOL("migrate", PCSpkState, migrate, true),
213 DEFINE_PROP_END_OF_LIST(),
214};
215
216static void pcspk_class_initfn(ObjectClass *klass, void *data)
217{
218 DeviceClass *dc = DEVICE_CLASS(klass);
219
220 dc->realize = pcspk_realizefn;
221 set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
222 dc->vmsd = &vmstate_spk;
223 dc->props = pcspk_properties;
224
225 dc->user_creatable = false;
226}
227
228static const TypeInfo pcspk_info = {
229 .name = TYPE_PC_SPEAKER,
230 .parent = TYPE_ISA_DEVICE,
231 .instance_size = sizeof(PCSpkState),
232 .instance_init = pcspk_initfn,
233 .class_init = pcspk_class_initfn,
234};
235
236static void pcspk_register(void)
237{
238 type_register_static(&pcspk_info);
239 isa_register_soundhw("pcspk", "PC speaker", pcspk_audio_init);
240}
241type_init(pcspk_register)
242
