1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Driver for audio on multifunction CS5535 companion device
4 * Copyright (C) Jaya Kumar
5 *
6 * Based on Jaroslav Kysela and Takashi Iwai's examples.
7 * This work was sponsored by CIS(M) Sdn Bhd.
8 *
9 * todo: add be fmt support, spdif, pm
10 */
11
12 #include <linux/init.h>
13 #include <linux/pci.h>
14 #include <sound/core.h>
15 #include <sound/control.h>
16 #include <sound/initval.h>
17 #include <sound/asoundef.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/ac97_codec.h>
21 #include "cs5535audio.h"
22
23 static const struct snd_pcm_hardware snd_cs5535audio_playback =
24 {
25 .info = (
26 SNDRV_PCM_INFO_MMAP |
27 SNDRV_PCM_INFO_INTERLEAVED |
28 SNDRV_PCM_INFO_BLOCK_TRANSFER |
29 SNDRV_PCM_INFO_MMAP_VALID |
30 SNDRV_PCM_INFO_PAUSE |
31 SNDRV_PCM_INFO_RESUME
32 ),
33 .formats = (
34 SNDRV_PCM_FMTBIT_S16_LE
35 ),
36 .rates = (
37 SNDRV_PCM_RATE_CONTINUOUS |
38 SNDRV_PCM_RATE_8000_48000
39 ),
40 .rate_min = 4000,
41 .rate_max = 48000,
42 .channels_min = 2,
43 .channels_max = 2,
44 .buffer_bytes_max = (128*1024),
45 .period_bytes_min = 64,
46 .period_bytes_max = (64*1024 - 16),
47 .periods_min = 1,
48 .periods_max = CS5535AUDIO_MAX_DESCRIPTORS,
49 .fifo_size = 0,
50 };
51
52 static const struct snd_pcm_hardware snd_cs5535audio_capture =
53 {
54 .info = (
55 SNDRV_PCM_INFO_MMAP |
56 SNDRV_PCM_INFO_INTERLEAVED |
57 SNDRV_PCM_INFO_BLOCK_TRANSFER |
58 SNDRV_PCM_INFO_MMAP_VALID
59 ),
60 .formats = (
61 SNDRV_PCM_FMTBIT_S16_LE
62 ),
63 .rates = (
64 SNDRV_PCM_RATE_CONTINUOUS |
65 SNDRV_PCM_RATE_8000_48000
66 ),
67 .rate_min = 4000,
68 .rate_max = 48000,
69 .channels_min = 2,
70 .channels_max = 2,
71 .buffer_bytes_max = (128*1024),
72 .period_bytes_min = 64,
73 .period_bytes_max = (64*1024 - 16),
74 .periods_min = 1,
75 .periods_max = CS5535AUDIO_MAX_DESCRIPTORS,
76 .fifo_size = 0,
77 };
78
79 static int snd_cs5535audio_playback_open(struct snd_pcm_substream *substream)
80 {
81 int err;
82 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
83 struct snd_pcm_runtime *runtime = substream->runtime;
84
85 runtime->hw = snd_cs5535audio_playback;
86 runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_FRONT_DAC];
87 snd_pcm_limit_hw_rates(runtime);
88 cs5535au->playback_substream = substream;
89 runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK]);
90 err = snd_pcm_hw_constraint_integer(runtime,
91 SNDRV_PCM_HW_PARAM_PERIODS);
92 if (err < 0)
93 return err;
94
95 return 0;
96 }
97
98 static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream)
99 {
100 return 0;
101 }
102
103 #define CS5535AUDIO_DESC_LIST_SIZE \
104 PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc))
105
106 static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
107 struct cs5535audio_dma *dma,
108 struct snd_pcm_substream *substream,
109 unsigned int periods,
110 unsigned int period_bytes)
111 {
112 unsigned int i;
113 u32 addr, jmpprd_addr;
114 struct cs5535audio_dma_desc *lastdesc;
115
116 if (periods > CS5535AUDIO_MAX_DESCRIPTORS)
117 return -ENOMEM;
118
119 if (dma->desc_buf.area == NULL) {
120 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
121 &cs5535au->pci->dev,
122 CS5535AUDIO_DESC_LIST_SIZE+1,
123 &dma->desc_buf) < 0)
124 return -ENOMEM;
125 dma->period_bytes = dma->periods = 0;
126 }
127
128 if (dma->periods == periods && dma->period_bytes == period_bytes)
129 return 0;
130
131 /* the u32 cast is okay because in snd*create we successfully told
132 pci alloc that we're only 32 bit capable so the upper will be 0 */
133 addr = (u32) substream->runtime->dma_addr;
134 for (i = 0; i < periods; i++) {
135 struct cs5535audio_dma_desc *desc =
136 &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[i];
137 desc->addr = cpu_to_le32(addr);
138 desc->size = cpu_to_le16(period_bytes);
139 desc->ctlreserved = cpu_to_le16(PRD_EOP);
140 addr += period_bytes;
141 }
142 /* we reserved one dummy descriptor at the end to do the PRD jump */
143 lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
144 lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
145 lastdesc->size = 0;
146 lastdesc->ctlreserved = cpu_to_le16(PRD_JMP);
147 jmpprd_addr = (u32)dma->desc_buf.addr +
148 sizeof(struct cs5535audio_dma_desc) * periods;
149
150 dma->substream = substream;
151 dma->period_bytes = period_bytes;
152 dma->periods = periods;
153 spin_lock_irq(&cs5535au->reg_lock);
154 dma->ops->disable_dma(cs5535au);
155 dma->ops->setup_prd(cs5535au, jmpprd_addr);
156 spin_unlock_irq(&cs5535au->reg_lock);
157 return 0;
158 }
159
160 static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
161 {
162 cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
163 }
164
165 static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
166 {
167 cs_writeb(cs5535au, ACC_BM0_CMD, 0);
168 }
169
170 static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
171 {
172 cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
173 }
174
175 static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
176 u32 prd_addr)
177 {
178 cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
179 }
180
181 static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
182 {
183 return cs_readl(cs5535au, ACC_BM0_PRD);
184 }
185
186 static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
187 {
188 return cs_readl(cs5535au, ACC_BM0_PNTR);
189 }
190
191 static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
192 {
193 cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
194 }
195
196 static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
197 {
198 cs_writeb(cs5535au, ACC_BM1_CMD, 0);
199 }
200
201 static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
202 {
203 cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
204 }
205
206 static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
207 u32 prd_addr)
208 {
209 cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
210 }
211
212 static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
213 {
214 return cs_readl(cs5535au, ACC_BM1_PRD);
215 }
216
217 static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
218 {
219 return cs_readl(cs5535au, ACC_BM1_PNTR);
220 }
221
222 static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
223 struct cs5535audio_dma *dma,
224 struct snd_pcm_substream *substream)
225 {
226 snd_dma_free_pages(&dma->desc_buf);
227 dma->desc_buf.area = NULL;
228 dma->substream = NULL;
229 }
230
231 static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
232 struct snd_pcm_hw_params *hw_params)
233 {
234 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
235 struct cs5535audio_dma *dma = substream->runtime->private_data;
236 int err;
237
238 dma->buf_addr = substream->runtime->dma_addr;
239 dma->buf_bytes = params_buffer_bytes(hw_params);
240
241 err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
242 params_periods(hw_params),
243 params_period_bytes(hw_params));
244 if (!err)
245 dma->pcm_open_flag = 1;
246
247 return err;
248 }
249
250 static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
251 {
252 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
253 struct cs5535audio_dma *dma = substream->runtime->private_data;
254
255 if (dma->pcm_open_flag) {
256 if (substream == cs5535au->playback_substream)
257 snd_ac97_update_power(cs5535au->ac97,
258 AC97_PCM_FRONT_DAC_RATE, 0);
259 else
260 snd_ac97_update_power(cs5535au->ac97,
261 AC97_PCM_LR_ADC_RATE, 0);
262 dma->pcm_open_flag = 0;
263 }
264 cs5535audio_clear_dma_packets(cs5535au, dma, substream);
265 return 0;
266 }
267
268 static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
269 {
270 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
271 return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
272 substream->runtime->rate);
273 }
274
275 static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
276 {
277 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
278 struct cs5535audio_dma *dma = substream->runtime->private_data;
279 int err = 0;
280
281 spin_lock(&cs5535au->reg_lock);
282 switch (cmd) {
283 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
284 dma->ops->pause_dma(cs5535au);
285 break;
286 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
287 dma->ops->enable_dma(cs5535au);
288 break;
289 case SNDRV_PCM_TRIGGER_START:
290 dma->ops->enable_dma(cs5535au);
291 break;
292 case SNDRV_PCM_TRIGGER_RESUME:
293 dma->ops->enable_dma(cs5535au);
294 break;
295 case SNDRV_PCM_TRIGGER_STOP:
296 dma->ops->disable_dma(cs5535au);
297 break;
298 case SNDRV_PCM_TRIGGER_SUSPEND:
299 dma->ops->disable_dma(cs5535au);
300 break;
301 default:
302 dev_err(cs5535au->card->dev, "unhandled trigger\n");
303 err = -EINVAL;
304 break;
305 }
306 spin_unlock(&cs5535au->reg_lock);
307 return err;
308 }
309
310 static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
311 *substream)
312 {
313 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
314 u32 curdma;
315 struct cs5535audio_dma *dma;
316
317 dma = substream->runtime->private_data;
318 curdma = dma->ops->read_dma_pntr(cs5535au);
319 if (curdma < dma->buf_addr) {
320 dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n",
321 curdma, dma->buf_addr);
322 return 0;
323 }
324 curdma -= dma->buf_addr;
325 if (curdma >= dma->buf_bytes) {
326 dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n",
327 curdma, dma->buf_bytes);
328 return 0;
329 }
330 return bytes_to_frames(substream->runtime, curdma);
331 }
332
333 static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
334 {
335 int err;
336 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
337 struct snd_pcm_runtime *runtime = substream->runtime;
338
339 runtime->hw = snd_cs5535audio_capture;
340 runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC];
341 snd_pcm_limit_hw_rates(runtime);
342 cs5535au->capture_substream = substream;
343 runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
344 err = snd_pcm_hw_constraint_integer(runtime,
345 SNDRV_PCM_HW_PARAM_PERIODS);
346 if (err < 0)
347 return err;
348 olpc_capture_open(cs5535au->ac97);
349 return 0;
350 }
351
352 static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
353 {
354 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
355 olpc_capture_close(cs5535au->ac97);
356 return 0;
357 }
358
359 static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream)
360 {
361 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
362 return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE,
363 substream->runtime->rate);
364 }
365
366 static const struct snd_pcm_ops snd_cs5535audio_playback_ops = {
367 .open = snd_cs5535audio_playback_open,
368 .close = snd_cs5535audio_playback_close,
369 .hw_params = snd_cs5535audio_hw_params,
370 .hw_free = snd_cs5535audio_hw_free,
371 .prepare = snd_cs5535audio_playback_prepare,
372 .trigger = snd_cs5535audio_trigger,
373 .pointer = snd_cs5535audio_pcm_pointer,
374 };
375
376 static const struct snd_pcm_ops snd_cs5535audio_capture_ops = {
377 .open = snd_cs5535audio_capture_open,
378 .close = snd_cs5535audio_capture_close,
379 .hw_params = snd_cs5535audio_hw_params,
380 .hw_free = snd_cs5535audio_hw_free,
381 .prepare = snd_cs5535audio_capture_prepare,
382 .trigger = snd_cs5535audio_trigger,
383 .pointer = snd_cs5535audio_pcm_pointer,
384 };
385
386 static const struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = {
387 .type = CS5535AUDIO_DMA_PLAYBACK,
388 .enable_dma = cs5535audio_playback_enable_dma,
389 .disable_dma = cs5535audio_playback_disable_dma,
390 .setup_prd = cs5535audio_playback_setup_prd,
391 .read_prd = cs5535audio_playback_read_prd,
392 .pause_dma = cs5535audio_playback_pause_dma,
393 .read_dma_pntr = cs5535audio_playback_read_dma_pntr,
394 };
395
396 static const struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = {
397 .type = CS5535AUDIO_DMA_CAPTURE,
398 .enable_dma = cs5535audio_capture_enable_dma,
399 .disable_dma = cs5535audio_capture_disable_dma,
400 .setup_prd = cs5535audio_capture_setup_prd,
401 .read_prd = cs5535audio_capture_read_prd,
402 .pause_dma = cs5535audio_capture_pause_dma,
403 .read_dma_pntr = cs5535audio_capture_read_dma_pntr,
404 };
405
406 int snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
407 {
408 struct snd_pcm *pcm;
409 int err;
410
411 err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
412 if (err < 0)
413 return err;
414
415 cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
416 &snd_cs5535audio_playback_dma_ops;
417 cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
418 &snd_cs5535audio_capture_dma_ops;
419 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
420 &snd_cs5535audio_playback_ops);
421 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
422 &snd_cs5535audio_capture_ops);
423
424 pcm->private_data = cs5535au;
425 pcm->info_flags = 0;
426 strcpy(pcm->name, "CS5535 Audio");
427
428 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
429 &cs5535au->pci->dev,
430 64*1024, 128*1024);
431 cs5535au->pcm = pcm;
432
433 return 0;
434 }
435
436
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