1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * 4 * Support for CX23885 analog audio capture 5 * 6 * (c) 2008 Mijhail Moreyra <mijhail.moreyra@gmail.com> 7 * Adapted from cx88-alsa.c 8 * (c) 2009 Steven Toth <stoth@kernellabs.com> 9 */ 10 11 #include "cx23885.h" 12 #include "cx23885-reg.h" 13 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/device.h> 17 #include <linux/interrupt.h> 18 #include <linux/vmalloc.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/pci.h> 21 22 #include <asm/delay.h> 23 24 #include <sound/core.h> 25 #include <sound/pcm.h> 26 #include <sound/pcm_params.h> 27 #include <sound/control.h> 28 #include <sound/initval.h> 29 30 #include <sound/tlv.h> 31 32 #define AUDIO_SRAM_CHANNEL SRAM_CH07 33 34 #define dprintk(level, fmt, arg...) do { \ 35 if (audio_debug + 1 > level) \ 36 printk(KERN_DEBUG pr_fmt("%s: alsa: " fmt), \ 37 chip->dev->name, ##arg); \ 38 } while(0) 39 40 /**************************************************************************** 41 Module global static vars 42 ****************************************************************************/ 43 44 static unsigned int disable_analog_audio; 45 module_param(disable_analog_audio, int, 0644); 46 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver"); 47 48 static unsigned int audio_debug; 49 module_param(audio_debug, int, 0644); 50 MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]"); 51 52 /**************************************************************************** 53 Board specific functions 54 ****************************************************************************/ 55 56 /* Constants taken from cx88-reg.h */ 57 #define AUD_INT_DN_RISCI1 (1 << 0) 58 #define AUD_INT_UP_RISCI1 (1 << 1) 59 #define AUD_INT_RDS_DN_RISCI1 (1 << 2) 60 #define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */ 61 #define AUD_INT_UP_RISCI2 (1 << 5) 62 #define AUD_INT_RDS_DN_RISCI2 (1 << 6) 63 #define AUD_INT_DN_SYNC (1 << 12) 64 #define AUD_INT_UP_SYNC (1 << 13) 65 #define AUD_INT_RDS_DN_SYNC (1 << 14) 66 #define AUD_INT_OPC_ERR (1 << 16) 67 #define AUD_INT_BER_IRQ (1 << 20) 68 #define AUD_INT_MCHG_IRQ (1 << 21) 69 #define GP_COUNT_CONTROL_RESET 0x3 70 71 static int cx23885_alsa_dma_init(struct cx23885_audio_dev *chip, 72 unsigned long nr_pages) 73 { 74 struct cx23885_audio_buffer *buf = chip->buf; 75 struct page *pg; 76 int i; 77 78 buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); 79 if (NULL == buf->vaddr) { 80 dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages); 81 return -ENOMEM; 82 } 83 84 dprintk(1, "vmalloc is at addr %p, size=%lu\n", 85 buf->vaddr, nr_pages << PAGE_SHIFT); 86 87 memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT); 88 buf->nr_pages = nr_pages; 89 90 buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages)); 91 if (NULL == buf->sglist) 92 goto vzalloc_err; 93 94 sg_init_table(buf->sglist, buf->nr_pages); 95 for (i = 0; i < buf->nr_pages; i++) { 96 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE); 97 if (NULL == pg) 98 goto vmalloc_to_page_err; 99 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0); 100 } 101 return 0; 102 103 vmalloc_to_page_err: 104 vfree(buf->sglist); 105 buf->sglist = NULL; 106 vzalloc_err: 107 vfree(buf->vaddr); 108 buf->vaddr = NULL; 109 return -ENOMEM; 110 } 111 112 static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev) 113 { 114 struct cx23885_audio_buffer *buf = dev->buf; 115 116 buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist, 117 buf->nr_pages, DMA_FROM_DEVICE); 118 119 if (0 == buf->sglen) { 120 pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__); 121 return -ENOMEM; 122 } 123 return 0; 124 } 125 126 static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev) 127 { 128 struct cx23885_audio_buffer *buf = dev->buf; 129 130 if (!buf->sglen) 131 return 0; 132 133 dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, DMA_FROM_DEVICE); 134 buf->sglen = 0; 135 return 0; 136 } 137 138 static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf) 139 { 140 vfree(buf->sglist); 141 buf->sglist = NULL; 142 vfree(buf->vaddr); 143 buf->vaddr = NULL; 144 return 0; 145 } 146 147 /* 148 * BOARD Specific: Sets audio DMA 149 */ 150 151 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip) 152 { 153 struct cx23885_audio_buffer *buf = chip->buf; 154 struct cx23885_dev *dev = chip->dev; 155 struct sram_channel *audio_ch = 156 &dev->sram_channels[AUDIO_SRAM_CHANNEL]; 157 158 dprintk(1, "%s()\n", __func__); 159 160 /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ 161 cx_clear(AUD_INT_DMA_CTL, 0x11); 162 163 /* setup fifo + format - out channel */ 164 cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl, 165 buf->risc.dma); 166 167 /* sets bpl size */ 168 cx_write(AUD_INT_A_LNGTH, buf->bpl); 169 170 /* This is required to get good audio (1 seems to be ok) */ 171 cx_write(AUD_INT_A_MODE, 1); 172 173 /* reset counter */ 174 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 175 atomic_set(&chip->count, 0); 176 177 dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d byte buffer\n", 178 buf->bpl, cx_read(audio_ch->cmds_start+12)>>1, 179 chip->num_periods, buf->bpl * chip->num_periods); 180 181 /* Enables corresponding bits at AUD_INT_STAT */ 182 cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 183 AUD_INT_DN_RISCI1); 184 185 /* Clean any pending interrupt bits already set */ 186 cx_write(AUDIO_INT_INT_STAT, ~0); 187 188 /* enable audio irqs */ 189 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT); 190 191 /* start dma */ 192 cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */ 193 cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and 194 RISC enable */ 195 if (audio_debug) 196 cx23885_sram_channel_dump(chip->dev, audio_ch); 197 198 return 0; 199 } 200 201 /* 202 * BOARD Specific: Resets audio DMA 203 */ 204 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip) 205 { 206 struct cx23885_dev *dev = chip->dev; 207 dprintk(1, "Stopping audio DMA\n"); 208 209 /* stop dma */ 210 cx_clear(AUD_INT_DMA_CTL, 0x11); 211 212 /* disable irqs */ 213 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT); 214 cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 215 AUD_INT_DN_RISCI1); 216 217 if (audio_debug) 218 cx23885_sram_channel_dump(chip->dev, 219 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 220 221 return 0; 222 } 223 224 /* 225 * BOARD Specific: Handles audio IRQ 226 */ 227 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask) 228 { 229 struct cx23885_audio_dev *chip = dev->audio_dev; 230 231 if (0 == (status & mask)) 232 return 0; 233 234 cx_write(AUDIO_INT_INT_STAT, status); 235 236 /* risc op code error */ 237 if (status & AUD_INT_OPC_ERR) { 238 pr_warn("%s/1: Audio risc op code error\n", 239 dev->name); 240 cx_clear(AUD_INT_DMA_CTL, 0x11); 241 cx23885_sram_channel_dump(dev, 242 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 243 } 244 if (status & AUD_INT_DN_SYNC) { 245 dprintk(1, "Downstream sync error\n"); 246 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 247 return 1; 248 } 249 /* risc1 downstream */ 250 if (status & AUD_INT_DN_RISCI1) { 251 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT)); 252 snd_pcm_period_elapsed(chip->substream); 253 } 254 /* FIXME: Any other status should deserve a special handling? */ 255 256 return 1; 257 } 258 259 static int dsp_buffer_free(struct cx23885_audio_dev *chip) 260 { 261 struct cx23885_riscmem *risc; 262 263 BUG_ON(!chip->dma_size); 264 265 dprintk(2, "Freeing buffer\n"); 266 cx23885_alsa_dma_unmap(chip); 267 cx23885_alsa_dma_free(chip->buf); 268 risc = &chip->buf->risc; 269 dma_free_coherent(&chip->pci->dev, risc->size, risc->cpu, risc->dma); 270 kfree(chip->buf); 271 272 chip->buf = NULL; 273 chip->dma_size = 0; 274 275 return 0; 276 } 277 278 /**************************************************************************** 279 ALSA PCM Interface 280 ****************************************************************************/ 281 282 /* 283 * Digital hardware definition 284 */ 285 #define DEFAULT_FIFO_SIZE 4096 286 287 static const struct snd_pcm_hardware snd_cx23885_digital_hw = { 288 .info = SNDRV_PCM_INFO_MMAP | 289 SNDRV_PCM_INFO_INTERLEAVED | 290 SNDRV_PCM_INFO_BLOCK_TRANSFER | 291 SNDRV_PCM_INFO_MMAP_VALID, 292 .formats = SNDRV_PCM_FMTBIT_S16_LE, 293 294 .rates = SNDRV_PCM_RATE_48000, 295 .rate_min = 48000, 296 .rate_max = 48000, 297 .channels_min = 2, 298 .channels_max = 2, 299 /* Analog audio output will be full of clicks and pops if there 300 are not exactly four lines in the SRAM FIFO buffer. */ 301 .period_bytes_min = DEFAULT_FIFO_SIZE/4, 302 .period_bytes_max = DEFAULT_FIFO_SIZE/4, 303 .periods_min = 1, 304 .periods_max = 1024, 305 .buffer_bytes_max = (1024*1024), 306 }; 307 308 /* 309 * audio pcm capture open callback 310 */ 311 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream) 312 { 313 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 314 struct snd_pcm_runtime *runtime = substream->runtime; 315 int err; 316 317 if (!chip) { 318 pr_err("BUG: cx23885 can't find device struct. Can't proceed with open\n"); 319 return -ENODEV; 320 } 321 322 err = snd_pcm_hw_constraint_pow2(runtime, 0, 323 SNDRV_PCM_HW_PARAM_PERIODS); 324 if (err < 0) 325 goto _error; 326 327 chip->substream = substream; 328 329 runtime->hw = snd_cx23885_digital_hw; 330 331 if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size != 332 DEFAULT_FIFO_SIZE) { 333 unsigned int bpl = chip->dev-> 334 sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4; 335 bpl &= ~7; /* must be multiple of 8 */ 336 runtime->hw.period_bytes_min = bpl; 337 runtime->hw.period_bytes_max = bpl; 338 } 339 340 return 0; 341 _error: 342 dprintk(1, "Error opening PCM!\n"); 343 return err; 344 } 345 346 /* 347 * audio close callback 348 */ 349 static int snd_cx23885_close(struct snd_pcm_substream *substream) 350 { 351 return 0; 352 } 353 354 355 /* 356 * hw_params callback 357 */ 358 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream, 359 struct snd_pcm_hw_params *hw_params) 360 { 361 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 362 struct cx23885_audio_buffer *buf; 363 int ret; 364 365 if (substream->runtime->dma_area) { 366 dsp_buffer_free(chip); 367 substream->runtime->dma_area = NULL; 368 } 369 370 chip->period_size = params_period_bytes(hw_params); 371 chip->num_periods = params_periods(hw_params); 372 chip->dma_size = chip->period_size * params_periods(hw_params); 373 374 BUG_ON(!chip->dma_size); 375 BUG_ON(chip->num_periods & (chip->num_periods-1)); 376 377 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 378 if (NULL == buf) 379 return -ENOMEM; 380 381 buf->bpl = chip->period_size; 382 chip->buf = buf; 383 384 ret = cx23885_alsa_dma_init(chip, 385 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT)); 386 if (ret < 0) 387 goto error; 388 389 ret = cx23885_alsa_dma_map(chip); 390 if (ret < 0) 391 goto error; 392 393 ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist, 394 chip->period_size, chip->num_periods, 1); 395 if (ret < 0) 396 goto error; 397 398 /* Loop back to start of program */ 399 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC); 400 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma); 401 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */ 402 403 substream->runtime->dma_area = chip->buf->vaddr; 404 substream->runtime->dma_bytes = chip->dma_size; 405 substream->runtime->dma_addr = 0; 406 407 return 0; 408 409 error: 410 kfree(buf); 411 chip->buf = NULL; 412 return ret; 413 } 414 415 /* 416 * hw free callback 417 */ 418 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream) 419 { 420 421 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 422 423 if (substream->runtime->dma_area) { 424 dsp_buffer_free(chip); 425 substream->runtime->dma_area = NULL; 426 } 427 428 return 0; 429 } 430 431 /* 432 * prepare callback 433 */ 434 static int snd_cx23885_prepare(struct snd_pcm_substream *substream) 435 { 436 return 0; 437 } 438 439 /* 440 * trigger callback 441 */ 442 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream, 443 int cmd) 444 { 445 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 446 int err; 447 448 /* Local interrupts are already disabled by ALSA */ 449 spin_lock(&chip->lock); 450 451 switch (cmd) { 452 case SNDRV_PCM_TRIGGER_START: 453 err = cx23885_start_audio_dma(chip); 454 break; 455 case SNDRV_PCM_TRIGGER_STOP: 456 err = cx23885_stop_audio_dma(chip); 457 break; 458 default: 459 err = -EINVAL; 460 break; 461 } 462 463 spin_unlock(&chip->lock); 464 465 return err; 466 } 467 468 /* 469 * pointer callback 470 */ 471 static snd_pcm_uframes_t snd_cx23885_pointer( 472 struct snd_pcm_substream *substream) 473 { 474 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 475 struct snd_pcm_runtime *runtime = substream->runtime; 476 u16 count; 477 478 count = atomic_read(&chip->count); 479 480 return runtime->period_size * (count & (runtime->periods-1)); 481 } 482 483 /* 484 * page callback (needed for mmap) 485 */ 486 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream, 487 unsigned long offset) 488 { 489 void *pageptr = substream->runtime->dma_area + offset; 490 return vmalloc_to_page(pageptr); 491 } 492 493 /* 494 * operators 495 */ 496 static const struct snd_pcm_ops snd_cx23885_pcm_ops = { 497 .open = snd_cx23885_pcm_open, 498 .close = snd_cx23885_close, 499 .hw_params = snd_cx23885_hw_params, 500 .hw_free = snd_cx23885_hw_free, 501 .prepare = snd_cx23885_prepare, 502 .trigger = snd_cx23885_card_trigger, 503 .pointer = snd_cx23885_pointer, 504 .page = snd_cx23885_page, 505 }; 506 507 /* 508 * create a PCM device 509 */ 510 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device, 511 char *name) 512 { 513 int err; 514 struct snd_pcm *pcm; 515 516 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm); 517 if (err < 0) 518 return err; 519 pcm->private_data = chip; 520 strscpy(pcm->name, name, sizeof(pcm->name)); 521 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops); 522 523 return 0; 524 } 525 526 /**************************************************************************** 527 Basic Flow for Sound Devices 528 ****************************************************************************/ 529 530 /* 531 * Alsa Constructor - Component probe 532 */ 533 534 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev) 535 { 536 struct snd_card *card; 537 struct cx23885_audio_dev *chip; 538 int err; 539 540 if (disable_analog_audio) 541 return NULL; 542 543 if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) { 544 pr_warn("%s(): Missing SRAM channel configuration for analog TV Audio\n", 545 __func__); 546 return NULL; 547 } 548 549 err = snd_card_new(&dev->pci->dev, 550 SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, 551 THIS_MODULE, sizeof(struct cx23885_audio_dev), &card); 552 if (err < 0) 553 goto error_msg; 554 555 chip = (struct cx23885_audio_dev *) card->private_data; 556 chip->dev = dev; 557 chip->pci = dev->pci; 558 chip->card = card; 559 spin_lock_init(&chip->lock); 560 561 err = snd_cx23885_pcm(chip, 0, "CX23885 Digital"); 562 if (err < 0) 563 goto error; 564 565 strscpy(card->driver, "CX23885", sizeof(card->driver)); 566 sprintf(card->shortname, "Conexant CX23885"); 567 sprintf(card->longname, "%s at %s", card->shortname, dev->name); 568 569 err = snd_card_register(card); 570 if (err < 0) 571 goto error; 572 573 dprintk(0, "registered ALSA audio device\n"); 574 575 return chip; 576 577 error: 578 snd_card_free(card); 579 error_msg: 580 pr_err("%s(): Failed to register analog audio adapter\n", 581 __func__); 582 583 return NULL; 584 } 585 586 /* 587 * ALSA destructor 588 */ 589 void cx23885_audio_unregister(struct cx23885_dev *dev) 590 { 591 struct cx23885_audio_dev *chip = dev->audio_dev; 592 593 snd_card_free(chip->card); 594 } 595