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