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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/module.h"
31#include "qemu/timer.h"
32#include "hw/timer/i8254.h"
33#include "hw/audio/pcspk.h"
34#include "qapi/error.h"
35
36#define PCSPK_BUF_LEN 1792
37#define PCSPK_SAMPLE_RATE 32000
38#define PCSPK_MAX_FREQ (PCSPK_SAMPLE_RATE >> 1)
39#define PCSPK_MIN_COUNT DIV_ROUND_UP(PIT_FREQ, PCSPK_MAX_FREQ)
40
41#define PC_SPEAKER(obj) OBJECT_CHECK(PCSpkState, (obj), TYPE_PC_SPEAKER)
42
43typedef struct {
44 ISADevice parent_obj;
45
46 MemoryRegion ioport;
47 uint32_t iobase;
48 uint8_t sample_buf[PCSPK_BUF_LEN];
49 QEMUSoundCard card;
50 SWVoiceOut *voice;
51 void *pit;
52 unsigned int pit_count;
53 unsigned int samples;
54 unsigned int play_pos;
55 uint8_t data_on;
56 uint8_t dummy_refresh_clock;
57 bool migrate;
58} PCSpkState;
59
60static const char *s_spk = "pcspk";
61static PCSpkState *pcspk_state;
62
63static inline void generate_samples(PCSpkState *s)
64{
65 unsigned int i;
66
67 if (s->pit_count) {
68 const uint32_t m = PCSPK_SAMPLE_RATE * s->pit_count;
69 const uint32_t n = ((uint64_t)PIT_FREQ << 32) / m;
70
71
72 s->samples = (QEMU_ALIGN_DOWN(PCSPK_BUF_LEN * PIT_FREQ, m) / (PIT_FREQ >> 1) + 1) >> 1;
73 for (i = 0; i < s->samples; ++i)
74 s->sample_buf[i] = (64 & (n * i >> 25)) - 32;
75 } else {
76 s->samples = PCSPK_BUF_LEN;
77 for (i = 0; i < PCSPK_BUF_LEN; ++i)
78 s->sample_buf[i] = 128;
79 }
80}
81
82static void pcspk_callback(void *opaque, int free)
83{
84 PCSpkState *s = opaque;
85 PITChannelInfo ch;
86 unsigned int n;
87
88 pit_get_channel_info(s->pit, 2, &ch);
89
90 if (ch.mode != 3) {
91 return;
92 }
93
94 n = ch.initial_count;
95
96 if (n < PCSPK_MIN_COUNT)
97 n = 0;
98
99 if (s->pit_count != n) {
100 s->pit_count = n;
101 s->play_pos = 0;
102 generate_samples(s);
103 }
104
105 while (free > 0) {
106 n = audio_MIN(s->samples - s->play_pos, (unsigned int)free);
107 n = AUD_write(s->voice, &s->sample_buf[s->play_pos], n);
108 if (!n)
109 break;
110 s->play_pos = (s->play_pos + n) % s->samples;
111 free -= n;
112 }
113}
114
115static int pcspk_audio_init(ISABus *bus)
116{
117 PCSpkState *s = pcspk_state;
118 struct audsettings as = {PCSPK_SAMPLE_RATE, 1, AUDIO_FORMAT_U8, 0};
119
120 AUD_register_card(s_spk, &s->card);
121
122 s->voice = AUD_open_out(&s->card, s->voice, s_spk, s, pcspk_callback, &as);
123 if (!s->voice) {
124 AUD_log(s_spk, "Could not open voice\n");
125 return -1;
126 }
127
128 return 0;
129}
130
131static uint64_t pcspk_io_read(void *opaque, hwaddr addr,
132 unsigned size)
133{
134 PCSpkState *s = opaque;
135 PITChannelInfo ch;
136
137 pit_get_channel_info(s->pit, 2, &ch);
138
139 s->dummy_refresh_clock ^= (1 << 4);
140
141 return ch.gate | (s->data_on << 1) | s->dummy_refresh_clock |
142 (ch.out << 5);
143}
144
145static void pcspk_io_write(void *opaque, hwaddr addr, uint64_t val,
146 unsigned size)
147{
148 PCSpkState *s = opaque;
149 const int gate = val & 1;
150
151 s->data_on = (val >> 1) & 1;
152 pit_set_gate(s->pit, 2, gate);
153 if (s->voice) {
154 if (gate)
155 s->play_pos = 0;
156 AUD_set_active_out(s->voice, gate & s->data_on);
157 }
158}
159
160static const MemoryRegionOps pcspk_io_ops = {
161 .read = pcspk_io_read,
162 .write = pcspk_io_write,
163 .impl = {
164 .min_access_size = 1,
165 .max_access_size = 1,
166 },
167};
168
169static void pcspk_initfn(Object *obj)
170{
171 PCSpkState *s = PC_SPEAKER(obj);
172
173 memory_region_init_io(&s->ioport, OBJECT(s), &pcspk_io_ops, s, "pcspk", 1);
174
175 object_property_add_link(obj, "pit", TYPE_PIT_COMMON,
176 (Object **)&s->pit,
177 qdev_prop_allow_set_link_before_realize,
178 0, &error_abort);
179}
180
181static void pcspk_realizefn(DeviceState *dev, Error **errp)
182{
183 ISADevice *isadev = ISA_DEVICE(dev);
184 PCSpkState *s = PC_SPEAKER(dev);
185
186 isa_register_ioport(isadev, &s->ioport, s->iobase);
187
188 pcspk_state = s;
189}
190
191static bool migrate_needed(void *opaque)
192{
193 PCSpkState *s = opaque;
194
195 return s->migrate;
196}
197
198static const VMStateDescription vmstate_spk = {
199 .name = "pcspk",
200 .version_id = 1,
201 .minimum_version_id = 1,
202 .minimum_version_id_old = 1,
203 .needed = migrate_needed,
204 .fields = (VMStateField[]) {
205 VMSTATE_UINT8(data_on, PCSpkState),
206 VMSTATE_UINT8(dummy_refresh_clock, PCSpkState),
207 VMSTATE_END_OF_LIST()
208 }
209};
210
211static Property pcspk_properties[] = {
212 DEFINE_PROP_UINT32("iobase", PCSpkState, iobase, -1),
213 DEFINE_PROP_BOOL("migrate", PCSpkState, migrate, true),
214 DEFINE_PROP_END_OF_LIST(),
215};
216
217static void pcspk_class_initfn(ObjectClass *klass, void *data)
218{
219 DeviceClass *dc = DEVICE_CLASS(klass);
220
221 dc->realize = pcspk_realizefn;
222 set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
223 dc->vmsd = &vmstate_spk;
224 dc->props = pcspk_properties;
225
226
227 dc->user_creatable = false;
228}
229
230static const TypeInfo pcspk_info = {
231 .name = TYPE_PC_SPEAKER,
232 .parent = TYPE_ISA_DEVICE,
233 .instance_size = sizeof(PCSpkState),
234 .instance_init = pcspk_initfn,
235 .class_init = pcspk_class_initfn,
236};
237
238static void pcspk_register(void)
239{
240 type_register_static(&pcspk_info);
241 isa_register_soundhw("pcspk", "PC speaker", pcspk_audio_init);
242}
243type_init(pcspk_register)
244
