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 err = snd_pcm_lib_malloc_pages(substream, 240 params_buffer_bytes(hw_params)); 241 if (err < 0) 242 return err; 243 dma->buf_addr = substream->runtime->dma_addr; 244 dma->buf_bytes = params_buffer_bytes(hw_params); 245 246 err = cs5535audio_build_dma_packets(cs5535au, dma, substream, 247 params_periods(hw_params), 248 params_period_bytes(hw_params)); 249 if (!err) 250 dma->pcm_open_flag = 1; 251 252 return err; 253 } 254 255 static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream) 256 { 257 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 258 struct cs5535audio_dma *dma = substream->runtime->private_data; 259 260 if (dma->pcm_open_flag) { 261 if (substream == cs5535au->playback_substream) 262 snd_ac97_update_power(cs5535au->ac97, 263 AC97_PCM_FRONT_DAC_RATE, 0); 264 else 265 snd_ac97_update_power(cs5535au->ac97, 266 AC97_PCM_LR_ADC_RATE, 0); 267 dma->pcm_open_flag = 0; 268 } 269 cs5535audio_clear_dma_packets(cs5535au, dma, substream); 270 return snd_pcm_lib_free_pages(substream); 271 } 272 273 static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream) 274 { 275 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 276 return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE, 277 substream->runtime->rate); 278 } 279 280 static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd) 281 { 282 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 283 struct cs5535audio_dma *dma = substream->runtime->private_data; 284 int err = 0; 285 286 spin_lock(&cs5535au->reg_lock); 287 switch (cmd) { 288 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 289 dma->ops->pause_dma(cs5535au); 290 break; 291 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 292 dma->ops->enable_dma(cs5535au); 293 break; 294 case SNDRV_PCM_TRIGGER_START: 295 dma->ops->enable_dma(cs5535au); 296 break; 297 case SNDRV_PCM_TRIGGER_RESUME: 298 dma->ops->enable_dma(cs5535au); 299 break; 300 case SNDRV_PCM_TRIGGER_STOP: 301 dma->ops->disable_dma(cs5535au); 302 break; 303 case SNDRV_PCM_TRIGGER_SUSPEND: 304 dma->ops->disable_dma(cs5535au); 305 break; 306 default: 307 dev_err(cs5535au->card->dev, "unhandled trigger\n"); 308 err = -EINVAL; 309 break; 310 } 311 spin_unlock(&cs5535au->reg_lock); 312 return err; 313 } 314 315 static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream 316 *substream) 317 { 318 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 319 u32 curdma; 320 struct cs5535audio_dma *dma; 321 322 dma = substream->runtime->private_data; 323 curdma = dma->ops->read_dma_pntr(cs5535au); 324 if (curdma < dma->buf_addr) { 325 dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n", 326 curdma, dma->buf_addr); 327 return 0; 328 } 329 curdma -= dma->buf_addr; 330 if (curdma >= dma->buf_bytes) { 331 dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n", 332 curdma, dma->buf_bytes); 333 return 0; 334 } 335 return bytes_to_frames(substream->runtime, curdma); 336 } 337 338 static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream) 339 { 340 int err; 341 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 342 struct snd_pcm_runtime *runtime = substream->runtime; 343 344 runtime->hw = snd_cs5535audio_capture; 345 runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC]; 346 snd_pcm_limit_hw_rates(runtime); 347 cs5535au->capture_substream = substream; 348 runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]); 349 if ((err = snd_pcm_hw_constraint_integer(runtime, 350 SNDRV_PCM_HW_PARAM_PERIODS)) < 0) 351 return err; 352 olpc_capture_open(cs5535au->ac97); 353 return 0; 354 } 355 356 static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream) 357 { 358 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 359 olpc_capture_close(cs5535au->ac97); 360 return 0; 361 } 362 363 static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream) 364 { 365 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 366 return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE, 367 substream->runtime->rate); 368 } 369 370 static const struct snd_pcm_ops snd_cs5535audio_playback_ops = { 371 .open = snd_cs5535audio_playback_open, 372 .close = snd_cs5535audio_playback_close, 373 .ioctl = snd_pcm_lib_ioctl, 374 .hw_params = snd_cs5535audio_hw_params, 375 .hw_free = snd_cs5535audio_hw_free, 376 .prepare = snd_cs5535audio_playback_prepare, 377 .trigger = snd_cs5535audio_trigger, 378 .pointer = snd_cs5535audio_pcm_pointer, 379 }; 380 381 static const struct snd_pcm_ops snd_cs5535audio_capture_ops = { 382 .open = snd_cs5535audio_capture_open, 383 .close = snd_cs5535audio_capture_close, 384 .ioctl = snd_pcm_lib_ioctl, 385 .hw_params = snd_cs5535audio_hw_params, 386 .hw_free = snd_cs5535audio_hw_free, 387 .prepare = snd_cs5535audio_capture_prepare, 388 .trigger = snd_cs5535audio_trigger, 389 .pointer = snd_cs5535audio_pcm_pointer, 390 }; 391 392 static const struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = { 393 .type = CS5535AUDIO_DMA_PLAYBACK, 394 .enable_dma = cs5535audio_playback_enable_dma, 395 .disable_dma = cs5535audio_playback_disable_dma, 396 .setup_prd = cs5535audio_playback_setup_prd, 397 .read_prd = cs5535audio_playback_read_prd, 398 .pause_dma = cs5535audio_playback_pause_dma, 399 .read_dma_pntr = cs5535audio_playback_read_dma_pntr, 400 }; 401 402 static const struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = { 403 .type = CS5535AUDIO_DMA_CAPTURE, 404 .enable_dma = cs5535audio_capture_enable_dma, 405 .disable_dma = cs5535audio_capture_disable_dma, 406 .setup_prd = cs5535audio_capture_setup_prd, 407 .read_prd = cs5535audio_capture_read_prd, 408 .pause_dma = cs5535audio_capture_pause_dma, 409 .read_dma_pntr = cs5535audio_capture_read_dma_pntr, 410 }; 411 412 int snd_cs5535audio_pcm(struct cs5535audio *cs5535au) 413 { 414 struct snd_pcm *pcm; 415 int err; 416 417 err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm); 418 if (err < 0) 419 return err; 420 421 cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops = 422 &snd_cs5535audio_playback_dma_ops; 423 cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops = 424 &snd_cs5535audio_capture_dma_ops; 425 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 426 &snd_cs5535audio_playback_ops); 427 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 428 &snd_cs5535audio_capture_ops); 429 430 pcm->private_data = cs5535au; 431 pcm->info_flags = 0; 432 strcpy(pcm->name, "CS5535 Audio"); 433 434 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 435 &cs5535au->pci->dev, 436 64*1024, 128*1024); 437 cs5535au->pcm = pcm; 438 439 return 0; 440 } 441 442