xref: /openbmc/qemu/hw/audio/gus.c (revision 35658f6e) 
1 /*
2  * QEMU Proxy for Gravis Ultrasound GF1 emulation by Tibor "TS" Schütz
3  *
4  * Copyright (c) 2002-2005 Vassili Karpov (malc)
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 #include "qemu/osdep.h"
25 #include "qapi/error.h"
26 #include "hw/hw.h"
27 #include "hw/audio/audio.h"
28 #include "audio/audio.h"
29 #include "hw/isa/isa.h"
30 #include "gusemu.h"
31 #include "gustate.h"
32 
33 #define dolog(...) AUD_log ("audio", __VA_ARGS__)
34 #ifdef DEBUG
35 #define ldebug(...) dolog (__VA_ARGS__)
36 #else
37 #define ldebug(...)
38 #endif
39 
40 #ifdef HOST_WORDS_BIGENDIAN
41 #define GUS_ENDIANNESS 1
42 #else
43 #define GUS_ENDIANNESS 0
44 #endif
45 
46 #define TYPE_GUS "gus"
47 #define GUS(obj) OBJECT_CHECK (GUSState, (obj), TYPE_GUS)
48 
49 typedef struct GUSState {
50     ISADevice dev;
51     GUSEmuState emu;
52     QEMUSoundCard card;
53     uint32_t freq;
54     uint32_t port;
55     int pos, left, shift, irqs;
56     GUSsample *mixbuf;
57     uint8_t himem[1024 * 1024 + 32 + 4096];
58     int samples;
59     SWVoiceOut *voice;
60     int64_t last_ticks;
61     qemu_irq pic;
62     IsaDma *isa_dma;
63 } GUSState;
64 
65 static uint32_t gus_readb(void *opaque, uint32_t nport)
66 {
67     GUSState *s = opaque;
68 
69     return gus_read (&s->emu, nport, 1);
70 }
71 
72 static void gus_writeb(void *opaque, uint32_t nport, uint32_t val)
73 {
74     GUSState *s = opaque;
75 
76     gus_write (&s->emu, nport, 1, val);
77 }
78 
79 static int write_audio (GUSState *s, int samples)
80 {
81     int net = 0;
82     int pos = s->pos;
83 
84     while (samples) {
85         int nbytes, wbytes, wsampl;
86 
87         nbytes = samples << s->shift;
88         wbytes = AUD_write (
89             s->voice,
90             s->mixbuf + (pos << (s->shift - 1)),
91             nbytes
92             );
93 
94         if (wbytes) {
95             wsampl = wbytes >> s->shift;
96 
97             samples -= wsampl;
98             pos = (pos + wsampl) % s->samples;
99 
100             net += wsampl;
101         }
102         else {
103             break;
104         }
105     }
106 
107     return net;
108 }
109 
110 static void GUS_callback (void *opaque, int free)
111 {
112     int samples, to_play, net = 0;
113     GUSState *s = opaque;
114 
115     samples = free >> s->shift;
116     to_play = audio_MIN (samples, s->left);
117 
118     while (to_play) {
119         int written = write_audio (s, to_play);
120 
121         if (!written) {
122             goto reset;
123         }
124 
125         s->left -= written;
126         to_play -= written;
127         samples -= written;
128         net += written;
129     }
130 
131     samples = audio_MIN (samples, s->samples);
132     if (samples) {
133         gus_mixvoices (&s->emu, s->freq, samples, s->mixbuf);
134 
135         while (samples) {
136             int written = write_audio (s, samples);
137             if (!written) {
138                 break;
139             }
140             samples -= written;
141             net += written;
142         }
143     }
144     s->left = samples;
145 
146  reset:
147     gus_irqgen (&s->emu, (uint64_t)net * 1000000 / s->freq);
148 }
149 
150 int GUS_irqrequest (GUSEmuState *emu, int hwirq, int n)
151 {
152     GUSState *s = emu->opaque;
153     /* qemu_irq_lower (s->pic); */
154     qemu_irq_raise (s->pic);
155     s->irqs += n;
156     ldebug ("irqrequest %d %d %d\n", hwirq, n, s->irqs);
157     return n;
158 }
159 
160 void GUS_irqclear (GUSEmuState *emu, int hwirq)
161 {
162     GUSState *s = emu->opaque;
163     ldebug ("irqclear %d %d\n", hwirq, s->irqs);
164     qemu_irq_lower (s->pic);
165     s->irqs -= 1;
166 #ifdef IRQ_STORM
167     if (s->irqs > 0) {
168         qemu_irq_raise (s->pic[hwirq]);
169     }
170 #endif
171 }
172 
173 void GUS_dmarequest (GUSEmuState *emu)
174 {
175     GUSState *s = emu->opaque;
176     IsaDmaClass *k = ISADMA_GET_CLASS(s->isa_dma);
177     ldebug ("dma request %d\n", der->gusdma);
178     k->hold_DREQ(s->isa_dma, s->emu.gusdma);
179 }
180 
181 static int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
182 {
183     GUSState *s = opaque;
184     IsaDmaClass *k = ISADMA_GET_CLASS(s->isa_dma);
185     char tmpbuf[4096];
186     int pos = dma_pos, mode, left = dma_len - dma_pos;
187 
188     ldebug ("read DMA %#x %d\n", dma_pos, dma_len);
189     mode = k->has_autoinitialization(s->isa_dma, s->emu.gusdma);
190     while (left) {
191         int to_copy = audio_MIN ((size_t) left, sizeof (tmpbuf));
192         int copied;
193 
194         ldebug ("left=%d to_copy=%d pos=%d\n", left, to_copy, pos);
195         copied = k->read_memory(s->isa_dma, nchan, tmpbuf, pos, to_copy);
196         gus_dma_transferdata (&s->emu, tmpbuf, copied, left == copied);
197         left -= copied;
198         pos += copied;
199     }
200 
201     if (((mode >> 4) & 1) == 0) {
202         k->release_DREQ(s->isa_dma, s->emu.gusdma);
203     }
204     return dma_len;
205 }
206 
207 static const VMStateDescription vmstate_gus = {
208     .name = "gus",
209     .version_id = 2,
210     .minimum_version_id = 2,
211     .fields = (VMStateField[]) {
212         VMSTATE_INT32 (pos, GUSState),
213         VMSTATE_INT32 (left, GUSState),
214         VMSTATE_INT32 (shift, GUSState),
215         VMSTATE_INT32 (irqs, GUSState),
216         VMSTATE_INT32 (samples, GUSState),
217         VMSTATE_INT64 (last_ticks, GUSState),
218         VMSTATE_BUFFER (himem, GUSState),
219         VMSTATE_END_OF_LIST ()
220     }
221 };
222 
223 static const MemoryRegionPortio gus_portio_list1[] = {
224     {0x000,  1, 1, .write = gus_writeb },
225     {0x006, 10, 1, .read = gus_readb, .write = gus_writeb },
226     {0x100,  8, 1, .read = gus_readb, .write = gus_writeb },
227     PORTIO_END_OF_LIST (),
228 };
229 
230 static const MemoryRegionPortio gus_portio_list2[] = {
231     {0, 2, 1, .read = gus_readb },
232     PORTIO_END_OF_LIST (),
233 };
234 
235 static void gus_realizefn (DeviceState *dev, Error **errp)
236 {
237     ISADevice *d = ISA_DEVICE(dev);
238     GUSState *s = GUS (dev);
239     IsaDmaClass *k;
240     struct audsettings as;
241 
242     AUD_register_card ("gus", &s->card);
243 
244     as.freq = s->freq;
245     as.nchannels = 2;
246     as.fmt = AUD_FMT_S16;
247     as.endianness = GUS_ENDIANNESS;
248 
249     s->voice = AUD_open_out (
250         &s->card,
251         NULL,
252         "gus",
253         s,
254         GUS_callback,
255         &as
256         );
257 
258     if (!s->voice) {
259         AUD_remove_card (&s->card);
260         error_setg(errp, "No voice");
261         return;
262     }
263 
264     s->shift = 2;
265     s->samples = AUD_get_buffer_size_out (s->voice) >> s->shift;
266     s->mixbuf = g_malloc0 (s->samples << s->shift);
267 
268     isa_register_portio_list (d, s->port, gus_portio_list1, s, "gus");
269     isa_register_portio_list (d, (s->port + 0x100) & 0xf00,
270                               gus_portio_list2, s, "gus");
271 
272     s->isa_dma = isa_get_dma(isa_bus_from_device(d), s->emu.gusdma);
273     k = ISADMA_GET_CLASS(s->isa_dma);
274     k->register_channel(s->isa_dma, s->emu.gusdma, GUS_read_DMA, s);
275     s->emu.himemaddr = s->himem;
276     s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
277     s->emu.opaque = s;
278     isa_init_irq (d, &s->pic, s->emu.gusirq);
279 
280     AUD_set_active_out (s->voice, 1);
281 }
282 
283 static int GUS_init (ISABus *bus)
284 {
285     isa_create_simple (bus, TYPE_GUS);
286     return 0;
287 }
288 
289 static Property gus_properties[] = {
290     DEFINE_PROP_UINT32 ("freq",    GUSState, freq,        44100),
291     DEFINE_PROP_UINT32 ("iobase",  GUSState, port,        0x240),
292     DEFINE_PROP_UINT32 ("irq",     GUSState, emu.gusirq,  7),
293     DEFINE_PROP_UINT32 ("dma",     GUSState, emu.gusdma,  3),
294     DEFINE_PROP_END_OF_LIST (),
295 };
296 
297 static void gus_class_initfn (ObjectClass *klass, void *data)
298 {
299     DeviceClass *dc = DEVICE_CLASS (klass);
300 
301     dc->realize = gus_realizefn;
302     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
303     dc->desc = "Gravis Ultrasound GF1";
304     dc->vmsd = &vmstate_gus;
305     dc->props = gus_properties;
306 }
307 
308 static const TypeInfo gus_info = {
309     .name          = TYPE_GUS,
310     .parent        = TYPE_ISA_DEVICE,
311     .instance_size = sizeof (GUSState),
312     .class_init    = gus_class_initfn,
313 };
314 
315 static void gus_register_types (void)
316 {
317     type_register_static (&gus_info);
318     isa_register_soundhw("gus", "Gravis Ultrasound GF1", GUS_init);
319 }
320 
321 type_init (gus_register_types)
322