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 guard(spinlock_irq)(&cs5535au->reg_lock); 154 dma->ops->disable_dma(cs5535au); 155 dma->ops->setup_prd(cs5535au, jmpprd_addr); 156 return 0; 157 } 158 159 static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au) 160 { 161 cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN); 162 } 163 164 static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au) 165 { 166 cs_writeb(cs5535au, ACC_BM0_CMD, 0); 167 } 168 169 static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au) 170 { 171 cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE); 172 } 173 174 static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au, 175 u32 prd_addr) 176 { 177 cs_writel(cs5535au, ACC_BM0_PRD, prd_addr); 178 } 179 180 static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au) 181 { 182 return cs_readl(cs5535au, ACC_BM0_PRD); 183 } 184 185 static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au) 186 { 187 return cs_readl(cs5535au, ACC_BM0_PNTR); 188 } 189 190 static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au) 191 { 192 cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN); 193 } 194 195 static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au) 196 { 197 cs_writeb(cs5535au, ACC_BM1_CMD, 0); 198 } 199 200 static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au) 201 { 202 cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE); 203 } 204 205 static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au, 206 u32 prd_addr) 207 { 208 cs_writel(cs5535au, ACC_BM1_PRD, prd_addr); 209 } 210 211 static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au) 212 { 213 return cs_readl(cs5535au, ACC_BM1_PRD); 214 } 215 216 static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au) 217 { 218 return cs_readl(cs5535au, ACC_BM1_PNTR); 219 } 220 221 static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au, 222 struct cs5535audio_dma *dma, 223 struct snd_pcm_substream *substream) 224 { 225 snd_dma_free_pages(&dma->desc_buf); 226 dma->desc_buf.area = NULL; 227 dma->substream = NULL; 228 } 229 230 static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream, 231 struct snd_pcm_hw_params *hw_params) 232 { 233 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 234 struct cs5535audio_dma *dma = substream->runtime->private_data; 235 int err; 236 237 dma->buf_addr = substream->runtime->dma_addr; 238 dma->buf_bytes = params_buffer_bytes(hw_params); 239 240 err = cs5535audio_build_dma_packets(cs5535au, dma, substream, 241 params_periods(hw_params), 242 params_period_bytes(hw_params)); 243 if (!err) 244 dma->pcm_open_flag = 1; 245 246 return err; 247 } 248 249 static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream) 250 { 251 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 252 struct cs5535audio_dma *dma = substream->runtime->private_data; 253 254 if (dma->pcm_open_flag) { 255 if (substream == cs5535au->playback_substream) 256 snd_ac97_update_power(cs5535au->ac97, 257 AC97_PCM_FRONT_DAC_RATE, 0); 258 else 259 snd_ac97_update_power(cs5535au->ac97, 260 AC97_PCM_LR_ADC_RATE, 0); 261 dma->pcm_open_flag = 0; 262 } 263 cs5535audio_clear_dma_packets(cs5535au, dma, substream); 264 return 0; 265 } 266 267 static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream) 268 { 269 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 270 return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE, 271 substream->runtime->rate); 272 } 273 274 static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd) 275 { 276 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 277 struct cs5535audio_dma *dma = substream->runtime->private_data; 278 279 guard(spinlock)(&cs5535au->reg_lock); 280 switch (cmd) { 281 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 282 dma->ops->pause_dma(cs5535au); 283 break; 284 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 285 dma->ops->enable_dma(cs5535au); 286 break; 287 case SNDRV_PCM_TRIGGER_START: 288 dma->ops->enable_dma(cs5535au); 289 break; 290 case SNDRV_PCM_TRIGGER_RESUME: 291 dma->ops->enable_dma(cs5535au); 292 break; 293 case SNDRV_PCM_TRIGGER_STOP: 294 dma->ops->disable_dma(cs5535au); 295 break; 296 case SNDRV_PCM_TRIGGER_SUSPEND: 297 dma->ops->disable_dma(cs5535au); 298 break; 299 default: 300 dev_err(cs5535au->card->dev, "unhandled trigger\n"); 301 return -EINVAL; 302 } 303 return 0; 304 } 305 306 static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream 307 *substream) 308 { 309 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 310 u32 curdma; 311 struct cs5535audio_dma *dma; 312 313 dma = substream->runtime->private_data; 314 curdma = dma->ops->read_dma_pntr(cs5535au); 315 if (curdma < dma->buf_addr) { 316 dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n", 317 curdma, dma->buf_addr); 318 return 0; 319 } 320 curdma -= dma->buf_addr; 321 if (curdma >= dma->buf_bytes) { 322 dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n", 323 curdma, dma->buf_bytes); 324 return 0; 325 } 326 return bytes_to_frames(substream->runtime, curdma); 327 } 328 329 static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream) 330 { 331 int err; 332 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 333 struct snd_pcm_runtime *runtime = substream->runtime; 334 335 runtime->hw = snd_cs5535audio_capture; 336 runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC]; 337 snd_pcm_limit_hw_rates(runtime); 338 cs5535au->capture_substream = substream; 339 runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]); 340 err = snd_pcm_hw_constraint_integer(runtime, 341 SNDRV_PCM_HW_PARAM_PERIODS); 342 if (err < 0) 343 return err; 344 olpc_capture_open(cs5535au->ac97); 345 return 0; 346 } 347 348 static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream) 349 { 350 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 351 olpc_capture_close(cs5535au->ac97); 352 return 0; 353 } 354 355 static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream) 356 { 357 struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream); 358 return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE, 359 substream->runtime->rate); 360 } 361 362 static const struct snd_pcm_ops snd_cs5535audio_playback_ops = { 363 .open = snd_cs5535audio_playback_open, 364 .close = snd_cs5535audio_playback_close, 365 .hw_params = snd_cs5535audio_hw_params, 366 .hw_free = snd_cs5535audio_hw_free, 367 .prepare = snd_cs5535audio_playback_prepare, 368 .trigger = snd_cs5535audio_trigger, 369 .pointer = snd_cs5535audio_pcm_pointer, 370 }; 371 372 static const struct snd_pcm_ops snd_cs5535audio_capture_ops = { 373 .open = snd_cs5535audio_capture_open, 374 .close = snd_cs5535audio_capture_close, 375 .hw_params = snd_cs5535audio_hw_params, 376 .hw_free = snd_cs5535audio_hw_free, 377 .prepare = snd_cs5535audio_capture_prepare, 378 .trigger = snd_cs5535audio_trigger, 379 .pointer = snd_cs5535audio_pcm_pointer, 380 }; 381 382 static const struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = { 383 .type = CS5535AUDIO_DMA_PLAYBACK, 384 .enable_dma = cs5535audio_playback_enable_dma, 385 .disable_dma = cs5535audio_playback_disable_dma, 386 .setup_prd = cs5535audio_playback_setup_prd, 387 .read_prd = cs5535audio_playback_read_prd, 388 .pause_dma = cs5535audio_playback_pause_dma, 389 .read_dma_pntr = cs5535audio_playback_read_dma_pntr, 390 }; 391 392 static const struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = { 393 .type = CS5535AUDIO_DMA_CAPTURE, 394 .enable_dma = cs5535audio_capture_enable_dma, 395 .disable_dma = cs5535audio_capture_disable_dma, 396 .setup_prd = cs5535audio_capture_setup_prd, 397 .read_prd = cs5535audio_capture_read_prd, 398 .pause_dma = cs5535audio_capture_pause_dma, 399 .read_dma_pntr = cs5535audio_capture_read_dma_pntr, 400 }; 401 402 int snd_cs5535audio_pcm(struct cs5535audio *cs5535au) 403 { 404 struct snd_pcm *pcm; 405 int err; 406 407 err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm); 408 if (err < 0) 409 return err; 410 411 cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops = 412 &snd_cs5535audio_playback_dma_ops; 413 cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops = 414 &snd_cs5535audio_capture_dma_ops; 415 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 416 &snd_cs5535audio_playback_ops); 417 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 418 &snd_cs5535audio_capture_ops); 419 420 pcm->private_data = cs5535au; 421 pcm->info_flags = 0; 422 strscpy(pcm->name, "CS5535 Audio"); 423 424 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, 425 &cs5535au->pci->dev, 426 64*1024, 128*1024); 427 cs5535au->pcm = pcm; 428 429 return 0; 430 } 431 432