xref: /openbmc/qemu/hw/audio/gus.c (revision e1fe50dc) 
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 "hw/hw.h"
25 #include "hw/audio/audio.h"
26 #include "audio/audio.h"
27 #include "hw/isa/isa.h"
28 #include "gusemu.h"
29 #include "gustate.h"
30 
31 #define dolog(...) AUD_log ("audio", __VA_ARGS__)
32 #ifdef DEBUG
33 #define ldebug(...) dolog (__VA_ARGS__)
34 #else
35 #define ldebug(...)
36 #endif
37 
38 #ifdef HOST_WORDS_BIGENDIAN
39 #define GUS_ENDIANNESS 1
40 #else
41 #define GUS_ENDIANNESS 0
42 #endif
43 
44 #define IO_READ_PROTO(name) \
45     static uint32_t name (void *opaque, uint32_t nport)
46 #define IO_WRITE_PROTO(name) \
47     static void name (void *opaque, uint32_t nport, uint32_t val)
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 } GUSState;
63 
64 IO_READ_PROTO (gus_readb)
65 {
66     GUSState *s = opaque;
67 
68     return gus_read (&s->emu, nport, 1);
69 }
70 
71 IO_READ_PROTO (gus_readw)
72 {
73     GUSState *s = opaque;
74 
75     return gus_read (&s->emu, nport, 2);
76 }
77 
78 IO_WRITE_PROTO (gus_writeb)
79 {
80     GUSState *s = opaque;
81 
82     gus_write (&s->emu, nport, 1, val);
83 }
84 
85 IO_WRITE_PROTO (gus_writew)
86 {
87     GUSState *s = opaque;
88 
89     gus_write (&s->emu, nport, 2, val);
90 }
91 
92 static int write_audio (GUSState *s, int samples)
93 {
94     int net = 0;
95     int pos = s->pos;
96 
97     while (samples) {
98         int nbytes, wbytes, wsampl;
99 
100         nbytes = samples << s->shift;
101         wbytes = AUD_write (
102             s->voice,
103             s->mixbuf + (pos << (s->shift - 1)),
104             nbytes
105             );
106 
107         if (wbytes) {
108             wsampl = wbytes >> s->shift;
109 
110             samples -= wsampl;
111             pos = (pos + wsampl) % s->samples;
112 
113             net += wsampl;
114         }
115         else {
116             break;
117         }
118     }
119 
120     return net;
121 }
122 
123 static void GUS_callback (void *opaque, int free)
124 {
125     int samples, to_play, net = 0;
126     GUSState *s = opaque;
127 
128     samples = free >> s->shift;
129     to_play = audio_MIN (samples, s->left);
130 
131     while (to_play) {
132         int written = write_audio (s, to_play);
133 
134         if (!written) {
135             goto reset;
136         }
137 
138         s->left -= written;
139         to_play -= written;
140         samples -= written;
141         net += written;
142     }
143 
144     samples = audio_MIN (samples, s->samples);
145     if (samples) {
146         gus_mixvoices (&s->emu, s->freq, samples, s->mixbuf);
147 
148         while (samples) {
149             int written = write_audio (s, samples);
150             if (!written) {
151                 break;
152             }
153             samples -= written;
154             net += written;
155         }
156     }
157     s->left = samples;
158 
159  reset:
160     gus_irqgen (&s->emu, muldiv64 (net, 1000000, s->freq));
161 }
162 
163 int GUS_irqrequest (GUSEmuState *emu, int hwirq, int n)
164 {
165     GUSState *s = emu->opaque;
166     /* qemu_irq_lower (s->pic); */
167     qemu_irq_raise (s->pic);
168     s->irqs += n;
169     ldebug ("irqrequest %d %d %d\n", hwirq, n, s->irqs);
170     return n;
171 }
172 
173 void GUS_irqclear (GUSEmuState *emu, int hwirq)
174 {
175     GUSState *s = emu->opaque;
176     ldebug ("irqclear %d %d\n", hwirq, s->irqs);
177     qemu_irq_lower (s->pic);
178     s->irqs -= 1;
179 #ifdef IRQ_STORM
180     if (s->irqs > 0) {
181         qemu_irq_raise (s->pic[hwirq]);
182     }
183 #endif
184 }
185 
186 void GUS_dmarequest (GUSEmuState *der)
187 {
188     /* GUSState *s = (GUSState *) der; */
189     ldebug ("dma request %d\n", der->gusdma);
190     DMA_hold_DREQ (der->gusdma);
191 }
192 
193 static int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
194 {
195     GUSState *s = opaque;
196     char tmpbuf[4096];
197     int pos = dma_pos, mode, left = dma_len - dma_pos;
198 
199     ldebug ("read DMA %#x %d\n", dma_pos, dma_len);
200     mode = DMA_get_channel_mode (s->emu.gusdma);
201     while (left) {
202         int to_copy = audio_MIN ((size_t) left, sizeof (tmpbuf));
203         int copied;
204 
205         ldebug ("left=%d to_copy=%d pos=%d\n", left, to_copy, pos);
206         copied = DMA_read_memory (nchan, tmpbuf, pos, to_copy);
207         gus_dma_transferdata (&s->emu, tmpbuf, copied, left == copied);
208         left -= copied;
209         pos += copied;
210     }
211 
212     if (0 == ((mode >> 4) & 1)) {
213         DMA_release_DREQ (s->emu.gusdma);
214     }
215     return dma_len;
216 }
217 
218 static const VMStateDescription vmstate_gus = {
219     .name = "gus",
220     .version_id = 2,
221     .minimum_version_id = 2,
222     .minimum_version_id_old = 2,
223     .fields      = (VMStateField []) {
224         VMSTATE_INT32 (pos, GUSState),
225         VMSTATE_INT32 (left, GUSState),
226         VMSTATE_INT32 (shift, GUSState),
227         VMSTATE_INT32 (irqs, GUSState),
228         VMSTATE_INT32 (samples, GUSState),
229         VMSTATE_INT64 (last_ticks, GUSState),
230         VMSTATE_BUFFER (himem, GUSState),
231         VMSTATE_END_OF_LIST ()
232     }
233 };
234 
235 static const MemoryRegionPortio gus_portio_list1[] = {
236     {0x000,  1, 1, .write = gus_writeb },
237     {0x000,  1, 2, .write = gus_writew },
238     {0x006, 10, 1, .read = gus_readb, .write = gus_writeb },
239     {0x006, 10, 2, .read = gus_readw, .write = gus_writew },
240     {0x100,  8, 1, .read = gus_readb, .write = gus_writeb },
241     {0x100,  8, 2, .read = gus_readw, .write = gus_writew },
242     PORTIO_END_OF_LIST (),
243 };
244 
245 static const MemoryRegionPortio gus_portio_list2[] = {
246     {0, 1, 1, .read = gus_readb },
247     {0, 1, 2, .read = gus_readw },
248     PORTIO_END_OF_LIST (),
249 };
250 
251 static int gus_initfn (ISADevice *dev)
252 {
253     GUSState *s = DO_UPCAST (GUSState, dev, dev);
254     struct audsettings as;
255 
256     AUD_register_card ("gus", &s->card);
257 
258     as.freq = s->freq;
259     as.nchannels = 2;
260     as.fmt = AUD_FMT_S16;
261     as.endianness = GUS_ENDIANNESS;
262 
263     s->voice = AUD_open_out (
264         &s->card,
265         NULL,
266         "gus",
267         s,
268         GUS_callback,
269         &as
270         );
271 
272     if (!s->voice) {
273         AUD_remove_card (&s->card);
274         return -1;
275     }
276 
277     s->shift = 2;
278     s->samples = AUD_get_buffer_size_out (s->voice) >> s->shift;
279     s->mixbuf = g_malloc0 (s->samples << s->shift);
280 
281     isa_register_portio_list (dev, s->port, gus_portio_list1, s, "gus");
282     isa_register_portio_list (dev, (s->port + 0x100) & 0xf00,
283                               gus_portio_list2, s, "gus");
284 
285     DMA_register_channel (s->emu.gusdma, GUS_read_DMA, s);
286     s->emu.himemaddr = s->himem;
287     s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
288     s->emu.opaque = s;
289     isa_init_irq (dev, &s->pic, s->emu.gusirq);
290 
291     AUD_set_active_out (s->voice, 1);
292 
293     return 0;
294 }
295 
296 int GUS_init (ISABus *bus)
297 {
298     isa_create_simple (bus, "gus");
299     return 0;
300 }
301 
302 static Property gus_properties[] = {
303     DEFINE_PROP_UINT32 ("freq",    GUSState, freq,        44100),
304     DEFINE_PROP_HEX32  ("iobase",  GUSState, port,        0x240),
305     DEFINE_PROP_UINT32 ("irq",     GUSState, emu.gusirq,  7),
306     DEFINE_PROP_UINT32 ("dma",     GUSState, emu.gusdma,  3),
307     DEFINE_PROP_END_OF_LIST (),
308 };
309 
310 static void gus_class_initfn (ObjectClass *klass, void *data)
311 {
312     DeviceClass *dc = DEVICE_CLASS (klass);
313     ISADeviceClass *ic = ISA_DEVICE_CLASS (klass);
314     ic->init = gus_initfn;
315     dc->desc = "Gravis Ultrasound GF1";
316     dc->vmsd = &vmstate_gus;
317     dc->props = gus_properties;
318 }
319 
320 static const TypeInfo gus_info = {
321     .name          = "gus",
322     .parent        = TYPE_ISA_DEVICE,
323     .instance_size = sizeof (GUSState),
324     .class_init    = gus_class_initfn,
325 };
326 
327 static void gus_register_types (void)
328 {
329     type_register_static (&gus_info);
330 }
331 
332 type_init (gus_register_types)
333