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1.1 root 1: /*
2: * QEMU PC speaker emulation
3: *
4: * Copyright (c) 2006 Joachim Henke
5: *
6: * Permission is hereby granted, free of charge, to any person obtaining a copy
7: * of this software and associated documentation files (the "Software"), to deal
8: * in the Software without restriction, including without limitation the rights
9: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10: * copies of the Software, and to permit persons to whom the Software is
11: * furnished to do so, subject to the following conditions:
12: *
13: * The above copyright notice and this permission notice shall be included in
14: * all copies or substantial portions of the Software.
15: *
16: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19: * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22: * THE SOFTWARE.
23: */
24:
1.1.1.3 root 25: #include "hw.h"
26: #include "pc.h"
27: #include "isa.h"
28: #include "audio/audio.h"
29: #include "qemu-timer.h"
1.1.1.7 ! root 30: #include "i8254.h"
! 31: #include "pcspk.h"
1.1 root 32:
33: #define PCSPK_BUF_LEN 1792
34: #define PCSPK_SAMPLE_RATE 32000
35: #define PCSPK_MAX_FREQ (PCSPK_SAMPLE_RATE >> 1)
36: #define PCSPK_MIN_COUNT ((PIT_FREQ + PCSPK_MAX_FREQ - 1) / PCSPK_MAX_FREQ)
37:
38: typedef struct {
1.1.1.7 ! root 39: ISADevice dev;
! 40: MemoryRegion ioport;
! 41: uint32_t iobase;
1.1 root 42: uint8_t sample_buf[PCSPK_BUF_LEN];
43: QEMUSoundCard card;
44: SWVoiceOut *voice;
1.1.1.7 ! root 45: void *pit;
1.1 root 46: unsigned int pit_count;
47: unsigned int samples;
48: unsigned int play_pos;
49: int data_on;
50: int dummy_refresh_clock;
51: } PCSpkState;
52:
53: static const char *s_spk = "pcspk";
1.1.1.7 ! root 54: static PCSpkState *pcspk_state;
1.1 root 55:
56: static inline void generate_samples(PCSpkState *s)
57: {
58: unsigned int i;
59:
60: if (s->pit_count) {
61: const uint32_t m = PCSPK_SAMPLE_RATE * s->pit_count;
62: const uint32_t n = ((uint64_t)PIT_FREQ << 32) / m;
63:
64: /* multiple of wavelength for gapless looping */
65: s->samples = (PCSPK_BUF_LEN * PIT_FREQ / m * m / (PIT_FREQ >> 1) + 1) >> 1;
66: for (i = 0; i < s->samples; ++i)
67: s->sample_buf[i] = (64 & (n * i >> 25)) - 32;
68: } else {
69: s->samples = PCSPK_BUF_LEN;
70: for (i = 0; i < PCSPK_BUF_LEN; ++i)
71: s->sample_buf[i] = 128; /* silence */
72: }
73: }
74:
75: static void pcspk_callback(void *opaque, int free)
76: {
77: PCSpkState *s = opaque;
1.1.1.7 ! root 78: PITChannelInfo ch;
1.1 root 79: unsigned int n;
80:
1.1.1.7 ! root 81: pit_get_channel_info(s->pit, 2, &ch);
! 82:
! 83: if (ch.mode != 3) {
1.1 root 84: return;
1.1.1.7 ! root 85: }
1.1 root 86:
1.1.1.7 ! root 87: n = ch.initial_count;
1.1 root 88: /* avoid frequencies that are not reproducible with sample rate */
89: if (n < PCSPK_MIN_COUNT)
90: n = 0;
91:
92: if (s->pit_count != n) {
93: s->pit_count = n;
94: s->play_pos = 0;
95: generate_samples(s);
96: }
97:
98: while (free > 0) {
99: n = audio_MIN(s->samples - s->play_pos, (unsigned int)free);
100: n = AUD_write(s->voice, &s->sample_buf[s->play_pos], n);
101: if (!n)
102: break;
103: s->play_pos = (s->play_pos + n) % s->samples;
104: free -= n;
105: }
106: }
107:
1.1.1.7 ! root 108: int pcspk_audio_init(ISABus *bus)
1.1 root 109: {
1.1.1.7 ! root 110: PCSpkState *s = pcspk_state;
1.1.1.4 root 111: struct audsettings as = {PCSPK_SAMPLE_RATE, 1, AUD_FMT_U8, 0};
1.1 root 112:
1.1.1.5 root 113: AUD_register_card(s_spk, &s->card);
1.1 root 114:
1.1.1.2 root 115: s->voice = AUD_open_out(&s->card, s->voice, s_spk, s, pcspk_callback, &as);
1.1 root 116: if (!s->voice) {
117: AUD_log(s_spk, "Could not open voice\n");
118: return -1;
119: }
120:
121: return 0;
122: }
123:
1.1.1.7 ! root 124: static uint64_t pcspk_io_read(void *opaque, target_phys_addr_t addr,
! 125: unsigned size)
1.1 root 126: {
127: PCSpkState *s = opaque;
1.1.1.7 ! root 128: PITChannelInfo ch;
! 129:
! 130: pit_get_channel_info(s->pit, 2, &ch);
1.1 root 131:
132: s->dummy_refresh_clock ^= (1 << 4);
133:
1.1.1.7 ! root 134: return ch.gate | (s->data_on << 1) | s->dummy_refresh_clock |
! 135: (ch.out << 5);
1.1 root 136: }
137:
1.1.1.7 ! root 138: static void pcspk_io_write(void *opaque, target_phys_addr_t addr, uint64_t val,
! 139: unsigned size)
1.1 root 140: {
141: PCSpkState *s = opaque;
142: const int gate = val & 1;
143:
144: s->data_on = (val >> 1) & 1;
145: pit_set_gate(s->pit, 2, gate);
146: if (s->voice) {
147: if (gate) /* restart */
148: s->play_pos = 0;
149: AUD_set_active_out(s->voice, gate & s->data_on);
150: }
151: }
152:
1.1.1.7 ! root 153: static const MemoryRegionOps pcspk_io_ops = {
! 154: .read = pcspk_io_read,
! 155: .write = pcspk_io_write,
! 156: .impl = {
! 157: .min_access_size = 1,
! 158: .max_access_size = 1,
! 159: },
! 160: };
! 161:
! 162: static int pcspk_initfn(ISADevice *dev)
! 163: {
! 164: PCSpkState *s = DO_UPCAST(PCSpkState, dev, dev);
! 165:
! 166: memory_region_init_io(&s->ioport, &pcspk_io_ops, s, "elcr", 1);
! 167: isa_register_ioport(dev, &s->ioport, s->iobase);
! 168:
! 169: pcspk_state = s;
! 170:
! 171: return 0;
! 172: }
! 173:
! 174: static Property pcspk_properties[] = {
! 175: DEFINE_PROP_HEX32("iobase", PCSpkState, iobase, -1),
! 176: DEFINE_PROP_PTR("pit", PCSpkState, pit),
! 177: DEFINE_PROP_END_OF_LIST(),
! 178: };
! 179:
! 180: static void pcspk_class_initfn(ObjectClass *klass, void *data)
1.1 root 181: {
1.1.1.7 ! root 182: DeviceClass *dc = DEVICE_CLASS(klass);
! 183: ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
1.1 root 184:
1.1.1.7 ! root 185: ic->init = pcspk_initfn;
! 186: dc->no_user = 1;
! 187: dc->props = pcspk_properties;
! 188: }
! 189:
! 190: static TypeInfo pcspk_info = {
! 191: .name = "isa-pcspk",
! 192: .parent = TYPE_ISA_DEVICE,
! 193: .instance_size = sizeof(PCSpkState),
! 194: .class_init = pcspk_class_initfn,
! 195: };
! 196:
! 197: static void pcspk_register(void)
! 198: {
! 199: type_register_static(&pcspk_info);
1.1 root 200: }
1.1.1.7 ! root 201: type_init(pcspk_register)
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