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 if ((err = snd_pcm_hw_constraint_integer(runtime, 91 SNDRV_PCM_HW_PARAM_PERIODS)) < 0) 92 return err; 93 94 return 0; 95 } 96 97 static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream) 98 { 99 return 0; 100 } 101 102 #define CS5535AUDIO_DESC_LIST_SIZE \ 103 PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc)) 104 105 static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au, 106 struct cs5535audio_dma *dma, 107 struct snd_pcm_substream *substream, 108 unsigned int periods, 109 unsigned int period_bytes) 110 { 111 unsigned int i; 112 u32 addr, desc_addr, jmpprd_addr; 113 struct cs5535audio_dma_desc *lastdesc; 114 115 if (periods > CS5535AUDIO_MAX_DESCRIPTORS) 116 return -ENOMEM; 117 118 if (dma->desc_buf.area == NULL) { 119 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, 120 &cs5535au->pci->dev, 121 CS5535AUDIO_DESC_LIST_SIZE+1, 122 &dma->desc_buf) < 0) 123 return -ENOMEM; 124 dma->period_bytes = dma->periods = 0; 125 } 126 127 if (dma->periods == periods && dma->period_bytes == period_bytes) 128 return 0; 129 130 /* the u32 cast is okay because in snd*create we successfully told 131 pci alloc that we're only 32 bit capable so the uppper will be 0 */ 132 addr = (u32) substream->runtime->dma_addr; 133 desc_addr = (u32) dma->desc_buf.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 desc_addr += sizeof(struct cs5535audio_dma_desc); 141 addr += period_bytes; 142 } 143 /* we reserved one dummy descriptor at the end to do the PRD jump */ 144 lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods]; 145 lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr); 146 lastdesc->size = 0; 147 lastdesc->ctlreserved = cpu_to_le16(PRD_JMP); 148 jmpprd_addr = (u32)dma->desc_buf.addr + 149 sizeof(struct cs5535audio_dma_desc) * periods; 150 151 dma->substream = substream; 152 dma->period_bytes = period_bytes; 153 dma->periods = periods; 154 spin_lock_irq(&cs5535au->reg_lock); 155 dma->ops->disable_dma(cs5535au); 156 dma->ops->setup_prd(cs5535au, jmpprd_addr); 157 spin_unlock_irq(&cs5535au->reg_lock); 158 return 0; 159 } 160 161 static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au) 162 { 163 cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN); 164 } 165 166 static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au) 167 { 168 cs_writeb(cs5535au, ACC_BM0_CMD, 0); 169 } 170 171 static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au) 172 { 173 cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE); 174 } 175 176 static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au, 177 u32 prd_addr) 178 { 179 cs_writel(cs5535au, ACC_BM0_PRD, prd_addr); 180 } 181 182 static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au) 183 { 184 return cs_readl(cs5535au, ACC_BM0_PRD); 185 } 186 187 static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au) 188 { 189 return cs_readl(cs5535au, ACC_BM0_PNTR); 190 } 191 192 static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au) 193 { 194 cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN); 195 } 196 197 static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au) 198 { 199 cs_writeb(cs5535au, ACC_BM1_CMD, 0); 200 } 201 202 static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au) 203 { 204 cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE); 205 } 206 207 static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au, 208 u32 prd_addr) 209 { 210 cs_writel(cs5535au, ACC_BM1_PRD, prd_addr); 211 } 212 213 static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au) 214 { 215 return cs_readl(cs5535au, ACC_BM1_PRD); 216 } 217 218 static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au) 219 { 220 return cs_readl(cs5535au, ACC_BM1_PNTR); 221 } 222 223 static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au, 224 struct cs5535audio_dma *dma, 225 struct snd_pcm_substream *substream) 226 { 227 snd_dma_free_pages(&dma->desc_buf); 228 dma->desc_buf.area = NULL; 229 dma->substream = NULL; 230 } 231 232 static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream, 233 struct snd_pcm_hw_params *hw_params) 234 { 235 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 236 struct cs5535audio_dma *dma = substream->runtime->private_data; 237 int err; 238 239 dma->buf_addr = substream->runtime->dma_addr; 240 dma->buf_bytes = params_buffer_bytes(hw_params); 241 242 err = cs5535audio_build_dma_packets(cs5535au, dma, substream, 243 params_periods(hw_params), 244 params_period_bytes(hw_params)); 245 if (!err) 246 dma->pcm_open_flag = 1; 247 248 return err; 249 } 250 251 static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream) 252 { 253 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 254 struct cs5535audio_dma *dma = substream->runtime->private_data; 255 256 if (dma->pcm_open_flag) { 257 if (substream == cs5535au->playback_substream) 258 snd_ac97_update_power(cs5535au->ac97, 259 AC97_PCM_FRONT_DAC_RATE, 0); 260 else 261 snd_ac97_update_power(cs5535au->ac97, 262 AC97_PCM_LR_ADC_RATE, 0); 263 dma->pcm_open_flag = 0; 264 } 265 cs5535audio_clear_dma_packets(cs5535au, dma, substream); 266 return 0; 267 } 268 269 static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream) 270 { 271 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 272 return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE, 273 substream->runtime->rate); 274 } 275 276 static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd) 277 { 278 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 279 struct cs5535audio_dma *dma = substream->runtime->private_data; 280 int err = 0; 281 282 spin_lock(&cs5535au->reg_lock); 283 switch (cmd) { 284 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 285 dma->ops->pause_dma(cs5535au); 286 break; 287 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 288 dma->ops->enable_dma(cs5535au); 289 break; 290 case SNDRV_PCM_TRIGGER_START: 291 dma->ops->enable_dma(cs5535au); 292 break; 293 case SNDRV_PCM_TRIGGER_RESUME: 294 dma->ops->enable_dma(cs5535au); 295 break; 296 case SNDRV_PCM_TRIGGER_STOP: 297 dma->ops->disable_dma(cs5535au); 298 break; 299 case SNDRV_PCM_TRIGGER_SUSPEND: 300 dma->ops->disable_dma(cs5535au); 301 break; 302 default: 303 dev_err(cs5535au->card->dev, "unhandled trigger\n"); 304 err = -EINVAL; 305 break; 306 } 307 spin_unlock(&cs5535au->reg_lock); 308 return err; 309 } 310 311 static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream 312 *substream) 313 { 314 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 315 u32 curdma; 316 struct cs5535audio_dma *dma; 317 318 dma = substream->runtime->private_data; 319 curdma = dma->ops->read_dma_pntr(cs5535au); 320 if (curdma < dma->buf_addr) { 321 dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n", 322 curdma, dma->buf_addr); 323 return 0; 324 } 325 curdma -= dma->buf_addr; 326 if (curdma >= dma->buf_bytes) { 327 dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n", 328 curdma, dma->buf_bytes); 329 return 0; 330 } 331 return bytes_to_frames(substream->runtime, curdma); 332 } 333 334 static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream) 335 { 336 int err; 337 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 338 struct snd_pcm_runtime *runtime = substream->runtime; 339 340 runtime->hw = snd_cs5535audio_capture; 341 runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC]; 342 snd_pcm_limit_hw_rates(runtime); 343 cs5535au->capture_substream = substream; 344 runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]); 345 if ((err = snd_pcm_hw_constraint_integer(runtime, 346 SNDRV_PCM_HW_PARAM_PERIODS)) < 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