1 /*
2 * LM4549 Audio Codec Interface
3 *
4 * Copyright (c) 2011
5 * Written by Mathieu Sonet - www.elasticsheep.com
6 *
7 * This code is licensed under the GPL.
8 *
9 * *****************************************************************
10 *
11 * This driver emulates the LM4549 codec.
12 *
13 * It supports only one playback voice and no record voice.
14 */
15
16 #include "qemu/osdep.h"
17 #include "hw/hw.h"
18 #include "audio/audio.h"
19 #include "lm4549.h"
20 #include "migration/vmstate.h"
21
22 #if 0
23 #define LM4549_DEBUG 1
24 #endif
25
26 #if 0
27 #define LM4549_DUMP_DAC_INPUT 1
28 #endif
29
30 #ifdef LM4549_DEBUG
31 #define DPRINTF(fmt, ...) \
32 do { printf("lm4549: " fmt , ## __VA_ARGS__); } while (0)
33 #else
34 #define DPRINTF(fmt, ...) do {} while (0)
35 #endif
36
37 #if defined(LM4549_DUMP_DAC_INPUT)
38 static FILE *fp_dac_input;
39 #endif
40
41 /* LM4549 register list */
42 enum {
43 LM4549_Reset = 0x00,
44 LM4549_Master_Volume = 0x02,
45 LM4549_Line_Out_Volume = 0x04,
46 LM4549_Master_Volume_Mono = 0x06,
47 LM4549_PC_Beep_Volume = 0x0A,
48 LM4549_Phone_Volume = 0x0C,
49 LM4549_Mic_Volume = 0x0E,
50 LM4549_Line_In_Volume = 0x10,
51 LM4549_CD_Volume = 0x12,
52 LM4549_Video_Volume = 0x14,
53 LM4549_Aux_Volume = 0x16,
54 LM4549_PCM_Out_Volume = 0x18,
55 LM4549_Record_Select = 0x1A,
56 LM4549_Record_Gain = 0x1C,
57 LM4549_General_Purpose = 0x20,
58 LM4549_3D_Control = 0x22,
59 LM4549_Powerdown_Ctrl_Stat = 0x26,
60 LM4549_Ext_Audio_ID = 0x28,
61 LM4549_Ext_Audio_Stat_Ctrl = 0x2A,
62 LM4549_PCM_Front_DAC_Rate = 0x2C,
63 LM4549_PCM_ADC_Rate = 0x32,
64 LM4549_Vendor_ID1 = 0x7C,
65 LM4549_Vendor_ID2 = 0x7E
66 };
67
lm4549_reset(lm4549_state * s)68 static void lm4549_reset(lm4549_state *s)
69 {
70 uint16_t *regfile = s->regfile;
71
72 regfile[LM4549_Reset] = 0x0d50;
73 regfile[LM4549_Master_Volume] = 0x8008;
74 regfile[LM4549_Line_Out_Volume] = 0x8000;
75 regfile[LM4549_Master_Volume_Mono] = 0x8000;
76 regfile[LM4549_PC_Beep_Volume] = 0x0000;
77 regfile[LM4549_Phone_Volume] = 0x8008;
78 regfile[LM4549_Mic_Volume] = 0x8008;
79 regfile[LM4549_Line_In_Volume] = 0x8808;
80 regfile[LM4549_CD_Volume] = 0x8808;
81 regfile[LM4549_Video_Volume] = 0x8808;
82 regfile[LM4549_Aux_Volume] = 0x8808;
83 regfile[LM4549_PCM_Out_Volume] = 0x8808;
84 regfile[LM4549_Record_Select] = 0x0000;
85 regfile[LM4549_Record_Gain] = 0x8000;
86 regfile[LM4549_General_Purpose] = 0x0000;
87 regfile[LM4549_3D_Control] = 0x0101;
88 regfile[LM4549_Powerdown_Ctrl_Stat] = 0x000f;
89 regfile[LM4549_Ext_Audio_ID] = 0x0001;
90 regfile[LM4549_Ext_Audio_Stat_Ctrl] = 0x0000;
91 regfile[LM4549_PCM_Front_DAC_Rate] = 0xbb80;
92 regfile[LM4549_PCM_ADC_Rate] = 0xbb80;
93 regfile[LM4549_Vendor_ID1] = 0x4e53;
94 regfile[LM4549_Vendor_ID2] = 0x4331;
95 }
96
lm4549_audio_transfer(lm4549_state * s)97 static void lm4549_audio_transfer(lm4549_state *s)
98 {
99 uint32_t written_bytes, written_samples;
100 uint32_t i;
101
102 /* Activate the voice */
103 AUD_set_active_out(s->voice, 1);
104 s->voice_is_active = 1;
105
106 /* Try to write the buffer content */
107 written_bytes = AUD_write(s->voice, s->buffer,
108 s->buffer_level * sizeof(uint16_t));
109 written_samples = written_bytes >> 1;
110
111 #if defined(LM4549_DUMP_DAC_INPUT)
112 fwrite(s->buffer, sizeof(uint8_t), written_bytes, fp_dac_input);
113 #endif
114
115 s->buffer_level -= written_samples;
116
117 if (s->buffer_level > 0) {
118 /* Move the data back to the start of the buffer */
119 for (i = 0; i < s->buffer_level; i++) {
120 s->buffer[i] = s->buffer[i + written_samples];
121 }
122 }
123 }
124
lm4549_audio_out_callback(void * opaque,int free)125 static void lm4549_audio_out_callback(void *opaque, int free)
126 {
127 lm4549_state *s = (lm4549_state *)opaque;
128 static uint32_t prev_buffer_level;
129
130 #ifdef LM4549_DEBUG
131 int size = AUD_get_buffer_size_out(s->voice);
132 DPRINTF("audio_out_callback size = %i free = %i\n", size, free);
133 #endif
134
135 /* Detect that no data are consumed
136 => disable the voice */
137 if (s->buffer_level == prev_buffer_level) {
138 AUD_set_active_out(s->voice, 0);
139 s->voice_is_active = 0;
140 }
141 prev_buffer_level = s->buffer_level;
142
143 /* Check if a buffer transfer is pending */
144 if (s->buffer_level == LM4549_BUFFER_SIZE) {
145 lm4549_audio_transfer(s);
146
147 /* Request more data */
148 if (s->data_req_cb != NULL) {
149 (s->data_req_cb)(s->opaque);
150 }
151 }
152 }
153
lm4549_read(lm4549_state * s,hwaddr offset)154 uint32_t lm4549_read(lm4549_state *s, hwaddr offset)
155 {
156 uint16_t *regfile = s->regfile;
157 uint32_t value = 0;
158
159 /* Read the stored value */
160 assert(offset < 128);
161 value = regfile[offset];
162
163 DPRINTF("read [0x%02x] = 0x%04x\n", offset, value);
164
165 return value;
166 }
167
lm4549_write(lm4549_state * s,hwaddr offset,uint32_t value)168 void lm4549_write(lm4549_state *s,
169 hwaddr offset, uint32_t value)
170 {
171 uint16_t *regfile = s->regfile;
172
173 assert(offset < 128);
174 DPRINTF("write [0x%02x] = 0x%04x\n", offset, value);
175
176 switch (offset) {
177 case LM4549_Reset:
178 lm4549_reset(s);
179 break;
180
181 case LM4549_PCM_Front_DAC_Rate:
182 regfile[LM4549_PCM_Front_DAC_Rate] = value;
183 DPRINTF("DAC rate change = %i\n", value);
184
185 /* Re-open a voice with the new sample rate */
186 struct audsettings as;
187 as.freq = value;
188 as.nchannels = 2;
189 as.fmt = AUDIO_FORMAT_S16;
190 as.endianness = 0;
191
192 s->voice = AUD_open_out(
193 &s->card,
194 s->voice,
195 "lm4549.out",
196 s,
197 lm4549_audio_out_callback,
198 &as
199 );
200 break;
201
202 case LM4549_Powerdown_Ctrl_Stat:
203 value &= ~0xf;
204 value |= regfile[LM4549_Powerdown_Ctrl_Stat] & 0xf;
205 regfile[LM4549_Powerdown_Ctrl_Stat] = value;
206 break;
207
208 case LM4549_Ext_Audio_ID:
209 case LM4549_Vendor_ID1:
210 case LM4549_Vendor_ID2:
211 DPRINTF("Write to read-only register 0x%x\n", (int)offset);
212 break;
213
214 default:
215 /* Store the new value */
216 regfile[offset] = value;
217 break;
218 }
219 }
220
lm4549_write_samples(lm4549_state * s,uint32_t left,uint32_t right)221 uint32_t lm4549_write_samples(lm4549_state *s, uint32_t left, uint32_t right)
222 {
223 /* The left and right samples are in 20-bit resolution.
224 The LM4549 has 18-bit resolution and only uses the bits [19:2].
225 This model supports 16-bit playback.
226 */
227
228 if (s->buffer_level > LM4549_BUFFER_SIZE - 2) {
229 DPRINTF("write_sample Buffer full\n");
230 return 0;
231 }
232
233 /* Store 16-bit samples in the buffer */
234 s->buffer[s->buffer_level++] = (left >> 4);
235 s->buffer[s->buffer_level++] = (right >> 4);
236
237 if (s->buffer_level == LM4549_BUFFER_SIZE) {
238 /* Trigger the transfer of the buffer to the audio host */
239 lm4549_audio_transfer(s);
240 }
241
242 return 1;
243 }
244
lm4549_post_load(void * opaque,int version_id)245 static int lm4549_post_load(void *opaque, int version_id)
246 {
247 lm4549_state *s = (lm4549_state *)opaque;
248 uint16_t *regfile = s->regfile;
249
250 /* Re-open a voice with the current sample rate */
251 uint32_t freq = regfile[LM4549_PCM_Front_DAC_Rate];
252
253 DPRINTF("post_load freq = %i\n", freq);
254 DPRINTF("post_load voice_is_active = %i\n", s->voice_is_active);
255
256 struct audsettings as;
257 as.freq = freq;
258 as.nchannels = 2;
259 as.fmt = AUDIO_FORMAT_S16;
260 as.endianness = 0;
261
262 s->voice = AUD_open_out(
263 &s->card,
264 s->voice,
265 "lm4549.out",
266 s,
267 lm4549_audio_out_callback,
268 &as
269 );
270
271 /* Request data */
272 if (s->voice_is_active == 1) {
273 lm4549_audio_out_callback(s, AUD_get_buffer_size_out(s->voice));
274 }
275
276 return 0;
277 }
278
lm4549_init(lm4549_state * s,lm4549_callback data_req_cb,void * opaque)279 void lm4549_init(lm4549_state *s, lm4549_callback data_req_cb, void* opaque)
280 {
281 struct audsettings as;
282
283 /* Store the callback and opaque pointer */
284 s->data_req_cb = data_req_cb;
285 s->opaque = opaque;
286
287 /* Init the registers */
288 lm4549_reset(s);
289
290 /* Register an audio card */
291 AUD_register_card("lm4549", &s->card);
292
293 /* Open a default voice */
294 as.freq = 48000;
295 as.nchannels = 2;
296 as.fmt = AUDIO_FORMAT_S16;
297 as.endianness = 0;
298
299 s->voice = AUD_open_out(
300 &s->card,
301 s->voice,
302 "lm4549.out",
303 s,
304 lm4549_audio_out_callback,
305 &as
306 );
307
308 AUD_set_volume_out(s->voice, 0, 255, 255);
309
310 s->voice_is_active = 0;
311
312 /* Reset the input buffer */
313 memset(s->buffer, 0x00, sizeof(s->buffer));
314 s->buffer_level = 0;
315
316 #if defined(LM4549_DUMP_DAC_INPUT)
317 fp_dac_input = fopen("lm4549_dac_input.pcm", "wb");
318 if (!fp_dac_input) {
319 hw_error("Unable to open lm4549_dac_input.pcm for writing\n");
320 }
321 #endif
322 }
323
324 const VMStateDescription vmstate_lm4549_state = {
325 .name = "lm4549_state",
326 .version_id = 1,
327 .minimum_version_id = 1,
328 .post_load = lm4549_post_load,
329 .fields = (VMStateField[]) {
330 VMSTATE_UINT32(voice_is_active, lm4549_state),
331 VMSTATE_UINT16_ARRAY(regfile, lm4549_state, 128),
332 VMSTATE_UINT16_ARRAY(buffer, lm4549_state, LM4549_BUFFER_SIZE),
333 VMSTATE_UINT32(buffer_level, lm4549_state),
334 VMSTATE_END_OF_LIST()
335 }
336 };
337