xref: /openbmc/qemu/hw/audio/gus.c (revision ba632924) 
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/soundhw.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     int16_t *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     PortioList portio_list1;
64     PortioList portio_list2;
65 } GUSState;
66 
67 static uint32_t gus_readb(void *opaque, uint32_t nport)
68 {
69     GUSState *s = opaque;
70 
71     return gus_read (&s->emu, nport, 1);
72 }
73 
74 static void gus_writeb(void *opaque, uint32_t nport, uint32_t val)
75 {
76     GUSState *s = opaque;
77 
78     gus_write (&s->emu, nport, 1, val);
79 }
80 
81 static int write_audio (GUSState *s, int samples)
82 {
83     int net = 0;
84     int pos = s->pos;
85 
86     while (samples) {
87         int nbytes, wbytes, wsampl;
88 
89         nbytes = samples << s->shift;
90         wbytes = AUD_write (
91             s->voice,
92             s->mixbuf + (pos << (s->shift - 1)),
93             nbytes
94             );
95 
96         if (wbytes) {
97             wsampl = wbytes >> s->shift;
98 
99             samples -= wsampl;
100             pos = (pos + wsampl) % s->samples;
101 
102             net += wsampl;
103         }
104         else {
105             break;
106         }
107     }
108 
109     return net;
110 }
111 
112 static void GUS_callback (void *opaque, int free)
113 {
114     int samples, to_play, net = 0;
115     GUSState *s = opaque;
116 
117     samples = free >> s->shift;
118     to_play = audio_MIN (samples, s->left);
119 
120     while (to_play) {
121         int written = write_audio (s, to_play);
122 
123         if (!written) {
124             goto reset;
125         }
126 
127         s->left -= written;
128         to_play -= written;
129         samples -= written;
130         net += written;
131     }
132 
133     samples = audio_MIN (samples, s->samples);
134     if (samples) {
135         gus_mixvoices (&s->emu, s->freq, samples, s->mixbuf);
136 
137         while (samples) {
138             int written = write_audio (s, samples);
139             if (!written) {
140                 break;
141             }
142             samples -= written;
143             net += written;
144         }
145     }
146     s->left = samples;
147 
148  reset:
149     gus_irqgen (&s->emu, (uint64_t)net * 1000000 / s->freq);
150 }
151 
152 int GUS_irqrequest (GUSEmuState *emu, int hwirq, int n)
153 {
154     GUSState *s = emu->opaque;
155     /* qemu_irq_lower (s->pic); */
156     qemu_irq_raise (s->pic);
157     s->irqs += n;
158     ldebug ("irqrequest %d %d %d\n", hwirq, n, s->irqs);
159     return n;
160 }
161 
162 void GUS_irqclear (GUSEmuState *emu, int hwirq)
163 {
164     GUSState *s = emu->opaque;
165     ldebug ("irqclear %d %d\n", hwirq, s->irqs);
166     qemu_irq_lower (s->pic);
167     s->irqs -= 1;
168 #ifdef IRQ_STORM
169     if (s->irqs > 0) {
170         qemu_irq_raise (s->pic[hwirq]);
171     }
172 #endif
173 }
174 
175 void GUS_dmarequest (GUSEmuState *emu)
176 {
177     GUSState *s = emu->opaque;
178     IsaDmaClass *k = ISADMA_GET_CLASS(s->isa_dma);
179     ldebug ("dma request %d\n", der->gusdma);
180     k->hold_DREQ(s->isa_dma, s->emu.gusdma);
181 }
182 
183 static int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
184 {
185     GUSState *s = opaque;
186     IsaDmaClass *k = ISADMA_GET_CLASS(s->isa_dma);
187     char tmpbuf[4096];
188     int pos = dma_pos, mode, left = dma_len - dma_pos;
189 
190     ldebug ("read DMA %#x %d\n", dma_pos, dma_len);
191     mode = k->has_autoinitialization(s->isa_dma, s->emu.gusdma);
192     while (left) {
193         int to_copy = audio_MIN ((size_t) left, sizeof (tmpbuf));
194         int copied;
195 
196         ldebug ("left=%d to_copy=%d pos=%d\n", left, to_copy, pos);
197         copied = k->read_memory(s->isa_dma, nchan, tmpbuf, pos, to_copy);
198         gus_dma_transferdata (&s->emu, tmpbuf, copied, left == copied);
199         left -= copied;
200         pos += copied;
201     }
202 
203     if (((mode >> 4) & 1) == 0) {
204         k->release_DREQ(s->isa_dma, s->emu.gusdma);
205     }
206     return dma_len;
207 }
208 
209 static const VMStateDescription vmstate_gus = {
210     .name = "gus",
211     .version_id = 2,
212     .minimum_version_id = 2,
213     .fields = (VMStateField[]) {
214         VMSTATE_INT32 (pos, GUSState),
215         VMSTATE_INT32 (left, GUSState),
216         VMSTATE_INT32 (shift, GUSState),
217         VMSTATE_INT32 (irqs, GUSState),
218         VMSTATE_INT32 (samples, GUSState),
219         VMSTATE_INT64 (last_ticks, GUSState),
220         VMSTATE_BUFFER (himem, GUSState),
221         VMSTATE_END_OF_LIST ()
222     }
223 };
224 
225 static const MemoryRegionPortio gus_portio_list1[] = {
226     {0x000,  1, 1, .write = gus_writeb },
227     {0x006, 10, 1, .read = gus_readb, .write = gus_writeb },
228     {0x100,  8, 1, .read = gus_readb, .write = gus_writeb },
229     PORTIO_END_OF_LIST (),
230 };
231 
232 static const MemoryRegionPortio gus_portio_list2[] = {
233     {0, 2, 1, .read = gus_readb },
234     PORTIO_END_OF_LIST (),
235 };
236 
237 static void gus_realizefn (DeviceState *dev, Error **errp)
238 {
239     ISADevice *d = ISA_DEVICE(dev);
240     GUSState *s = GUS (dev);
241     IsaDmaClass *k;
242     struct audsettings as;
243 
244     s->isa_dma = isa_get_dma(isa_bus_from_device(d), s->emu.gusdma);
245     if (!s->isa_dma) {
246         error_setg(errp, "ISA controller does not support DMA");
247         return;
248     }
249 
250     AUD_register_card ("gus", &s->card);
251 
252     as.freq = s->freq;
253     as.nchannels = 2;
254     as.fmt = AUD_FMT_S16;
255     as.endianness = GUS_ENDIANNESS;
256 
257     s->voice = AUD_open_out (
258         &s->card,
259         NULL,
260         "gus",
261         s,
262         GUS_callback,
263         &as
264         );
265 
266     if (!s->voice) {
267         AUD_remove_card (&s->card);
268         error_setg(errp, "No voice");
269         return;
270     }
271 
272     s->shift = 2;
273     s->samples = AUD_get_buffer_size_out (s->voice) >> s->shift;
274     s->mixbuf = g_malloc0 (s->samples << s->shift);
275 
276     isa_register_portio_list(d, &s->portio_list1, s->port,
277                              gus_portio_list1, s, "gus");
278     isa_register_portio_list(d, &s->portio_list2, (s->port + 0x100) & 0xf00,
279                              gus_portio_list2, s, "gus");
280 
281     k = ISADMA_GET_CLASS(s->isa_dma);
282     k->register_channel(s->isa_dma, s->emu.gusdma, GUS_read_DMA, s);
283     s->emu.himemaddr = s->himem;
284     s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
285     s->emu.opaque = s;
286     isa_init_irq (d, &s->pic, s->emu.gusirq);
287 
288     AUD_set_active_out (s->voice, 1);
289 }
290 
291 static int GUS_init (ISABus *bus)
292 {
293     isa_create_simple (bus, TYPE_GUS);
294     return 0;
295 }
296 
297 static Property gus_properties[] = {
298     DEFINE_PROP_UINT32 ("freq",    GUSState, freq,        44100),
299     DEFINE_PROP_UINT32 ("iobase",  GUSState, port,        0x240),
300     DEFINE_PROP_UINT32 ("irq",     GUSState, emu.gusirq,  7),
301     DEFINE_PROP_UINT32 ("dma",     GUSState, emu.gusdma,  3),
302     DEFINE_PROP_END_OF_LIST (),
303 };
304 
305 static void gus_class_initfn (ObjectClass *klass, void *data)
306 {
307     DeviceClass *dc = DEVICE_CLASS (klass);
308 
309     dc->realize = gus_realizefn;
310     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
311     dc->desc = "Gravis Ultrasound GF1";
312     dc->vmsd = &vmstate_gus;
313     dc->props = gus_properties;
314 }
315 
316 static const TypeInfo gus_info = {
317     .name          = TYPE_GUS,
318     .parent        = TYPE_ISA_DEVICE,
319     .instance_size = sizeof (GUSState),
320     .class_init    = gus_class_initfn,
321 };
322 
323 static void gus_register_types (void)
324 {
325     type_register_static (&gus_info);
326     isa_register_soundhw("gus", "Gravis Ultrasound GF1", GUS_init);
327 }
328 
329 type_init (gus_register_types)
330