xref: /openbmc/qemu/hw/audio/gus.c (revision 8e6fe6b8) 
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 
25 #include "qemu/osdep.h"
26 #include "qapi/error.h"
27 #include "qemu/module.h"
28 #include "hw/hw.h"
29 #include "hw/audio/soundhw.h"
30 #include "audio/audio.h"
31 #include "hw/isa/isa.h"
32 #include "gusemu.h"
33 #include "gustate.h"
34 
35 #define dolog(...) AUD_log ("audio", __VA_ARGS__)
36 #ifdef DEBUG
37 #define ldebug(...) dolog (__VA_ARGS__)
38 #else
39 #define ldebug(...)
40 #endif
41 
42 #ifdef HOST_WORDS_BIGENDIAN
43 #define GUS_ENDIANNESS 1
44 #else
45 #define GUS_ENDIANNESS 0
46 #endif
47 
48 #define TYPE_GUS "gus"
49 #define GUS(obj) OBJECT_CHECK (GUSState, (obj), TYPE_GUS)
50 
51 typedef struct GUSState {
52     ISADevice dev;
53     GUSEmuState emu;
54     QEMUSoundCard card;
55     uint32_t freq;
56     uint32_t port;
57     int pos, left, shift, irqs;
58     int16_t *mixbuf;
59     uint8_t himem[1024 * 1024 + 32 + 4096];
60     int samples;
61     SWVoiceOut *voice;
62     int64_t last_ticks;
63     qemu_irq pic;
64     IsaDma *isa_dma;
65     PortioList portio_list1;
66     PortioList portio_list2;
67 } GUSState;
68 
69 static uint32_t gus_readb(void *opaque, uint32_t nport)
70 {
71     GUSState *s = opaque;
72 
73     return gus_read (&s->emu, nport, 1);
74 }
75 
76 static void gus_writeb(void *opaque, uint32_t nport, uint32_t val)
77 {
78     GUSState *s = opaque;
79 
80     gus_write (&s->emu, nport, 1, val);
81 }
82 
83 static int write_audio (GUSState *s, int samples)
84 {
85     int net = 0;
86     int pos = s->pos;
87 
88     while (samples) {
89         int nbytes, wbytes, wsampl;
90 
91         nbytes = samples << s->shift;
92         wbytes = AUD_write (
93             s->voice,
94             s->mixbuf + (pos << (s->shift - 1)),
95             nbytes
96             );
97 
98         if (wbytes) {
99             wsampl = wbytes >> s->shift;
100 
101             samples -= wsampl;
102             pos = (pos + wsampl) % s->samples;
103 
104             net += wsampl;
105         }
106         else {
107             break;
108         }
109     }
110 
111     return net;
112 }
113 
114 static void GUS_callback (void *opaque, int free)
115 {
116     int samples, to_play, net = 0;
117     GUSState *s = opaque;
118 
119     samples = free >> s->shift;
120     to_play = audio_MIN (samples, s->left);
121 
122     while (to_play) {
123         int written = write_audio (s, to_play);
124 
125         if (!written) {
126             goto reset;
127         }
128 
129         s->left -= written;
130         to_play -= written;
131         samples -= written;
132         net += written;
133     }
134 
135     samples = audio_MIN (samples, s->samples);
136     if (samples) {
137         gus_mixvoices (&s->emu, s->freq, samples, s->mixbuf);
138 
139         while (samples) {
140             int written = write_audio (s, samples);
141             if (!written) {
142                 break;
143             }
144             samples -= written;
145             net += written;
146         }
147     }
148     s->left = samples;
149 
150  reset:
151     gus_irqgen (&s->emu, (uint64_t)net * 1000000 / s->freq);
152 }
153 
154 int GUS_irqrequest (GUSEmuState *emu, int hwirq, int n)
155 {
156     GUSState *s = emu->opaque;
157     /* qemu_irq_lower (s->pic); */
158     qemu_irq_raise (s->pic);
159     s->irqs += n;
160     ldebug ("irqrequest %d %d %d\n", hwirq, n, s->irqs);
161     return n;
162 }
163 
164 void GUS_irqclear (GUSEmuState *emu, int hwirq)
165 {
166     GUSState *s = emu->opaque;
167     ldebug ("irqclear %d %d\n", hwirq, s->irqs);
168     qemu_irq_lower (s->pic);
169     s->irqs -= 1;
170 #ifdef IRQ_STORM
171     if (s->irqs > 0) {
172         qemu_irq_raise (s->pic[hwirq]);
173     }
174 #endif
175 }
176 
177 void GUS_dmarequest (GUSEmuState *emu)
178 {
179     GUSState *s = emu->opaque;
180     IsaDmaClass *k = ISADMA_GET_CLASS(s->isa_dma);
181     ldebug ("dma request %d\n", der->gusdma);
182     k->hold_DREQ(s->isa_dma, s->emu.gusdma);
183 }
184 
185 static int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
186 {
187     GUSState *s = opaque;
188     IsaDmaClass *k = ISADMA_GET_CLASS(s->isa_dma);
189     char tmpbuf[4096];
190     int pos = dma_pos, mode, left = dma_len - dma_pos;
191 
192     ldebug ("read DMA %#x %d\n", dma_pos, dma_len);
193     mode = k->has_autoinitialization(s->isa_dma, s->emu.gusdma);
194     while (left) {
195         int to_copy = audio_MIN ((size_t) left, sizeof (tmpbuf));
196         int copied;
197 
198         ldebug ("left=%d to_copy=%d pos=%d\n", left, to_copy, pos);
199         copied = k->read_memory(s->isa_dma, nchan, tmpbuf, pos, to_copy);
200         gus_dma_transferdata (&s->emu, tmpbuf, copied, left == copied);
201         left -= copied;
202         pos += copied;
203     }
204 
205     if (((mode >> 4) & 1) == 0) {
206         k->release_DREQ(s->isa_dma, s->emu.gusdma);
207     }
208     return dma_len;
209 }
210 
211 static const VMStateDescription vmstate_gus = {
212     .name = "gus",
213     .version_id = 2,
214     .minimum_version_id = 2,
215     .fields = (VMStateField[]) {
216         VMSTATE_INT32 (pos, GUSState),
217         VMSTATE_INT32 (left, GUSState),
218         VMSTATE_INT32 (shift, GUSState),
219         VMSTATE_INT32 (irqs, GUSState),
220         VMSTATE_INT32 (samples, GUSState),
221         VMSTATE_INT64 (last_ticks, GUSState),
222         VMSTATE_BUFFER (himem, GUSState),
223         VMSTATE_END_OF_LIST ()
224     }
225 };
226 
227 static const MemoryRegionPortio gus_portio_list1[] = {
228     {0x000,  1, 1, .write = gus_writeb },
229     {0x006, 10, 1, .read = gus_readb, .write = gus_writeb },
230     {0x100,  8, 1, .read = gus_readb, .write = gus_writeb },
231     PORTIO_END_OF_LIST (),
232 };
233 
234 static const MemoryRegionPortio gus_portio_list2[] = {
235     {0, 2, 1, .read = gus_readb },
236     PORTIO_END_OF_LIST (),
237 };
238 
239 static void gus_realizefn (DeviceState *dev, Error **errp)
240 {
241     ISADevice *d = ISA_DEVICE(dev);
242     GUSState *s = GUS (dev);
243     IsaDmaClass *k;
244     struct audsettings as;
245 
246     s->isa_dma = isa_get_dma(isa_bus_from_device(d), s->emu.gusdma);
247     if (!s->isa_dma) {
248         error_setg(errp, "ISA controller does not support DMA");
249         return;
250     }
251 
252     AUD_register_card ("gus", &s->card);
253 
254     as.freq = s->freq;
255     as.nchannels = 2;
256     as.fmt = AUDIO_FORMAT_S16;
257     as.endianness = GUS_ENDIANNESS;
258 
259     s->voice = AUD_open_out (
260         &s->card,
261         NULL,
262         "gus",
263         s,
264         GUS_callback,
265         &as
266         );
267 
268     if (!s->voice) {
269         AUD_remove_card (&s->card);
270         error_setg(errp, "No voice");
271         return;
272     }
273 
274     s->shift = 2;
275     s->samples = AUD_get_buffer_size_out (s->voice) >> s->shift;
276     s->mixbuf = g_malloc0 (s->samples << s->shift);
277 
278     isa_register_portio_list(d, &s->portio_list1, s->port,
279                              gus_portio_list1, s, "gus");
280     isa_register_portio_list(d, &s->portio_list2, (s->port + 0x100) & 0xf00,
281                              gus_portio_list2, s, "gus");
282 
283     k = ISADMA_GET_CLASS(s->isa_dma);
284     k->register_channel(s->isa_dma, s->emu.gusdma, GUS_read_DMA, s);
285     s->emu.himemaddr = s->himem;
286     s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
287     s->emu.opaque = s;
288     isa_init_irq (d, &s->pic, s->emu.gusirq);
289 
290     AUD_set_active_out (s->voice, 1);
291 }
292 
293 static int GUS_init (ISABus *bus)
294 {
295     isa_create_simple (bus, TYPE_GUS);
296     return 0;
297 }
298 
299 static Property gus_properties[] = {
300     DEFINE_PROP_UINT32 ("freq",    GUSState, freq,        44100),
301     DEFINE_PROP_UINT32 ("iobase",  GUSState, port,        0x240),
302     DEFINE_PROP_UINT32 ("irq",     GUSState, emu.gusirq,  7),
303     DEFINE_PROP_UINT32 ("dma",     GUSState, emu.gusdma,  3),
304     DEFINE_PROP_END_OF_LIST (),
305 };
306 
307 static void gus_class_initfn (ObjectClass *klass, void *data)
308 {
309     DeviceClass *dc = DEVICE_CLASS (klass);
310 
311     dc->realize = gus_realizefn;
312     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
313     dc->desc = "Gravis Ultrasound GF1";
314     dc->vmsd = &vmstate_gus;
315     dc->props = gus_properties;
316 }
317 
318 static const TypeInfo gus_info = {
319     .name          = TYPE_GUS,
320     .parent        = TYPE_ISA_DEVICE,
321     .instance_size = sizeof (GUSState),
322     .class_init    = gus_class_initfn,
323 };
324 
325 static void gus_register_types (void)
326 {
327     type_register_static (&gus_info);
328     isa_register_soundhw("gus", "Gravis Ultrasound GF1", GUS_init);
329 }
330 
331 type_init (gus_register_types)
332