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, int nr_pages) 72 { 73 struct cx23885_audio_buffer *buf = chip->buf; 74 struct page *pg; 75 int i; 76 77 buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); 78 if (NULL == buf->vaddr) { 79 dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); 80 return -ENOMEM; 81 } 82 83 dprintk(1, "vmalloc is at addr %p, size=%d\n", 84 buf->vaddr, nr_pages << PAGE_SHIFT); 85 86 memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT); 87 buf->nr_pages = nr_pages; 88 89 buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages)); 90 if (NULL == buf->sglist) 91 goto vzalloc_err; 92 93 sg_init_table(buf->sglist, buf->nr_pages); 94 for (i = 0; i < buf->nr_pages; i++) { 95 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE); 96 if (NULL == pg) 97 goto vmalloc_to_page_err; 98 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0); 99 } 100 return 0; 101 102 vmalloc_to_page_err: 103 vfree(buf->sglist); 104 buf->sglist = NULL; 105 vzalloc_err: 106 vfree(buf->vaddr); 107 buf->vaddr = NULL; 108 return -ENOMEM; 109 } 110 111 static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev) 112 { 113 struct cx23885_audio_buffer *buf = dev->buf; 114 115 buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist, 116 buf->nr_pages, PCI_DMA_FROMDEVICE); 117 118 if (0 == buf->sglen) { 119 pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__); 120 return -ENOMEM; 121 } 122 return 0; 123 } 124 125 static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev) 126 { 127 struct cx23885_audio_buffer *buf = dev->buf; 128 129 if (!buf->sglen) 130 return 0; 131 132 dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE); 133 buf->sglen = 0; 134 return 0; 135 } 136 137 static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf) 138 { 139 vfree(buf->sglist); 140 buf->sglist = NULL; 141 vfree(buf->vaddr); 142 buf->vaddr = NULL; 143 return 0; 144 } 145 146 /* 147 * BOARD Specific: Sets audio DMA 148 */ 149 150 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip) 151 { 152 struct cx23885_audio_buffer *buf = chip->buf; 153 struct cx23885_dev *dev = chip->dev; 154 struct sram_channel *audio_ch = 155 &dev->sram_channels[AUDIO_SRAM_CHANNEL]; 156 157 dprintk(1, "%s()\n", __func__); 158 159 /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ 160 cx_clear(AUD_INT_DMA_CTL, 0x11); 161 162 /* setup fifo + format - out channel */ 163 cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl, 164 buf->risc.dma); 165 166 /* sets bpl size */ 167 cx_write(AUD_INT_A_LNGTH, buf->bpl); 168 169 /* This is required to get good audio (1 seems to be ok) */ 170 cx_write(AUD_INT_A_MODE, 1); 171 172 /* reset counter */ 173 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 174 atomic_set(&chip->count, 0); 175 176 dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d byte buffer\n", 177 buf->bpl, cx_read(audio_ch->cmds_start+12)>>1, 178 chip->num_periods, buf->bpl * chip->num_periods); 179 180 /* Enables corresponding bits at AUD_INT_STAT */ 181 cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 182 AUD_INT_DN_RISCI1); 183 184 /* Clean any pending interrupt bits already set */ 185 cx_write(AUDIO_INT_INT_STAT, ~0); 186 187 /* enable audio irqs */ 188 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT); 189 190 /* start dma */ 191 cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */ 192 cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and 193 RISC enable */ 194 if (audio_debug) 195 cx23885_sram_channel_dump(chip->dev, audio_ch); 196 197 return 0; 198 } 199 200 /* 201 * BOARD Specific: Resets audio DMA 202 */ 203 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip) 204 { 205 struct cx23885_dev *dev = chip->dev; 206 dprintk(1, "Stopping audio DMA\n"); 207 208 /* stop dma */ 209 cx_clear(AUD_INT_DMA_CTL, 0x11); 210 211 /* disable irqs */ 212 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT); 213 cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 214 AUD_INT_DN_RISCI1); 215 216 if (audio_debug) 217 cx23885_sram_channel_dump(chip->dev, 218 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 219 220 return 0; 221 } 222 223 /* 224 * BOARD Specific: Handles audio IRQ 225 */ 226 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask) 227 { 228 struct cx23885_audio_dev *chip = dev->audio_dev; 229 230 if (0 == (status & mask)) 231 return 0; 232 233 cx_write(AUDIO_INT_INT_STAT, status); 234 235 /* risc op code error */ 236 if (status & AUD_INT_OPC_ERR) { 237 pr_warn("%s/1: Audio risc op code error\n", 238 dev->name); 239 cx_clear(AUD_INT_DMA_CTL, 0x11); 240 cx23885_sram_channel_dump(dev, 241 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 242 } 243 if (status & AUD_INT_DN_SYNC) { 244 dprintk(1, "Downstream sync error\n"); 245 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 246 return 1; 247 } 248 /* risc1 downstream */ 249 if (status & AUD_INT_DN_RISCI1) { 250 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT)); 251 snd_pcm_period_elapsed(chip->substream); 252 } 253 /* FIXME: Any other status should deserve a special handling? */ 254 255 return 1; 256 } 257 258 static int dsp_buffer_free(struct cx23885_audio_dev *chip) 259 { 260 struct cx23885_riscmem *risc; 261 262 BUG_ON(!chip->dma_size); 263 264 dprintk(2, "Freeing buffer\n"); 265 cx23885_alsa_dma_unmap(chip); 266 cx23885_alsa_dma_free(chip->buf); 267 risc = &chip->buf->risc; 268 pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma); 269 kfree(chip->buf); 270 271 chip->buf = NULL; 272 chip->dma_size = 0; 273 274 return 0; 275 } 276 277 /**************************************************************************** 278 ALSA PCM Interface 279 ****************************************************************************/ 280 281 /* 282 * Digital hardware definition 283 */ 284 #define DEFAULT_FIFO_SIZE 4096 285 286 static const struct snd_pcm_hardware snd_cx23885_digital_hw = { 287 .info = SNDRV_PCM_INFO_MMAP | 288 SNDRV_PCM_INFO_INTERLEAVED | 289 SNDRV_PCM_INFO_BLOCK_TRANSFER | 290 SNDRV_PCM_INFO_MMAP_VALID, 291 .formats = SNDRV_PCM_FMTBIT_S16_LE, 292 293 .rates = SNDRV_PCM_RATE_48000, 294 .rate_min = 48000, 295 .rate_max = 48000, 296 .channels_min = 2, 297 .channels_max = 2, 298 /* Analog audio output will be full of clicks and pops if there 299 are not exactly four lines in the SRAM FIFO buffer. */ 300 .period_bytes_min = DEFAULT_FIFO_SIZE/4, 301 .period_bytes_max = DEFAULT_FIFO_SIZE/4, 302 .periods_min = 1, 303 .periods_max = 1024, 304 .buffer_bytes_max = (1024*1024), 305 }; 306 307 /* 308 * audio pcm capture open callback 309 */ 310 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream) 311 { 312 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 313 struct snd_pcm_runtime *runtime = substream->runtime; 314 int err; 315 316 if (!chip) { 317 pr_err("BUG: cx23885 can't find device struct. Can't proceed with open\n"); 318 return -ENODEV; 319 } 320 321 err = snd_pcm_hw_constraint_pow2(runtime, 0, 322 SNDRV_PCM_HW_PARAM_PERIODS); 323 if (err < 0) 324 goto _error; 325 326 chip->substream = substream; 327 328 runtime->hw = snd_cx23885_digital_hw; 329 330 if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size != 331 DEFAULT_FIFO_SIZE) { 332 unsigned int bpl = chip->dev-> 333 sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4; 334 bpl &= ~7; /* must be multiple of 8 */ 335 runtime->hw.period_bytes_min = bpl; 336 runtime->hw.period_bytes_max = bpl; 337 } 338 339 return 0; 340 _error: 341 dprintk(1, "Error opening PCM!\n"); 342 return err; 343 } 344 345 /* 346 * audio close callback 347 */ 348 static int snd_cx23885_close(struct snd_pcm_substream *substream) 349 { 350 return 0; 351 } 352 353 354 /* 355 * hw_params callback 356 */ 357 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream, 358 struct snd_pcm_hw_params *hw_params) 359 { 360 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 361 struct cx23885_audio_buffer *buf; 362 int ret; 363 364 if (substream->runtime->dma_area) { 365 dsp_buffer_free(chip); 366 substream->runtime->dma_area = NULL; 367 } 368 369 chip->period_size = params_period_bytes(hw_params); 370 chip->num_periods = params_periods(hw_params); 371 chip->dma_size = chip->period_size * params_periods(hw_params); 372 373 BUG_ON(!chip->dma_size); 374 BUG_ON(chip->num_periods & (chip->num_periods-1)); 375 376 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 377 if (NULL == buf) 378 return -ENOMEM; 379 380 buf->bpl = chip->period_size; 381 chip->buf = buf; 382 383 ret = cx23885_alsa_dma_init(chip, 384 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT)); 385 if (ret < 0) 386 goto error; 387 388 ret = cx23885_alsa_dma_map(chip); 389 if (ret < 0) 390 goto error; 391 392 ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist, 393 chip->period_size, chip->num_periods, 1); 394 if (ret < 0) 395 goto error; 396 397 /* Loop back to start of program */ 398 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC); 399 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma); 400 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */ 401 402 substream->runtime->dma_area = chip->buf->vaddr; 403 substream->runtime->dma_bytes = chip->dma_size; 404 substream->runtime->dma_addr = 0; 405 406 return 0; 407 408 error: 409 kfree(buf); 410 chip->buf = NULL; 411 return ret; 412 } 413 414 /* 415 * hw free callback 416 */ 417 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream) 418 { 419 420 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 421 422 if (substream->runtime->dma_area) { 423 dsp_buffer_free(chip); 424 substream->runtime->dma_area = NULL; 425 } 426 427 return 0; 428 } 429 430 /* 431 * prepare callback 432 */ 433 static int snd_cx23885_prepare(struct snd_pcm_substream *substream) 434 { 435 return 0; 436 } 437 438 /* 439 * trigger callback 440 */ 441 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream, 442 int cmd) 443 { 444 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 445 int err; 446 447 /* Local interrupts are already disabled by ALSA */ 448 spin_lock(&chip->lock); 449 450 switch (cmd) { 451 case SNDRV_PCM_TRIGGER_START: 452 err = cx23885_start_audio_dma(chip); 453 break; 454 case SNDRV_PCM_TRIGGER_STOP: 455 err = cx23885_stop_audio_dma(chip); 456 break; 457 default: 458 err = -EINVAL; 459 break; 460 } 461 462 spin_unlock(&chip->lock); 463 464 return err; 465 } 466 467 /* 468 * pointer callback 469 */ 470 static snd_pcm_uframes_t snd_cx23885_pointer( 471 struct snd_pcm_substream *substream) 472 { 473 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 474 struct snd_pcm_runtime *runtime = substream->runtime; 475 u16 count; 476 477 count = atomic_read(&chip->count); 478 479 return runtime->period_size * (count & (runtime->periods-1)); 480 } 481 482 /* 483 * page callback (needed for mmap) 484 */ 485 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream, 486 unsigned long offset) 487 { 488 void *pageptr = substream->runtime->dma_area + offset; 489 return vmalloc_to_page(pageptr); 490 } 491 492 /* 493 * operators 494 */ 495 static const struct snd_pcm_ops snd_cx23885_pcm_ops = { 496 .open = snd_cx23885_pcm_open, 497 .close = snd_cx23885_close, 498 .ioctl = snd_pcm_lib_ioctl, 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; 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 pr_err("%s(): Failed to register analog audio adapter\n", 580 __func__); 581 582 return NULL; 583 } 584 585 /* 586 * ALSA destructor 587 */ 588 void cx23885_audio_unregister(struct cx23885_dev *dev) 589 { 590 struct cx23885_audio_dev *chip = dev->audio_dev; 591 592 snd_card_free(chip->card); 593 } 594