1 /* 2 * 3 * Support for CX23885 analog audio capture 4 * 5 * (c) 2008 Mijhail Moreyra <mijhail.moreyra@gmail.com> 6 * Adapted from cx88-alsa.c 7 * (c) 2009 Steven Toth <stoth@kernellabs.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 */ 19 20 #include "cx23885.h" 21 #include "cx23885-reg.h" 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/device.h> 26 #include <linux/interrupt.h> 27 #include <linux/vmalloc.h> 28 #include <linux/dma-mapping.h> 29 #include <linux/pci.h> 30 31 #include <asm/delay.h> 32 33 #include <sound/core.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/control.h> 37 #include <sound/initval.h> 38 39 #include <sound/tlv.h> 40 41 #define AUDIO_SRAM_CHANNEL SRAM_CH07 42 43 #define dprintk(level, fmt, arg...) do { \ 44 if (audio_debug + 1 > level) \ 45 printk(KERN_DEBUG pr_fmt("%s: alsa: " fmt), \ 46 chip->dev->name, ##arg); \ 47 } while(0) 48 49 /**************************************************************************** 50 Module global static vars 51 ****************************************************************************/ 52 53 static unsigned int disable_analog_audio; 54 module_param(disable_analog_audio, int, 0644); 55 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver"); 56 57 static unsigned int audio_debug; 58 module_param(audio_debug, int, 0644); 59 MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]"); 60 61 /**************************************************************************** 62 Board specific funtions 63 ****************************************************************************/ 64 65 /* Constants taken from cx88-reg.h */ 66 #define AUD_INT_DN_RISCI1 (1 << 0) 67 #define AUD_INT_UP_RISCI1 (1 << 1) 68 #define AUD_INT_RDS_DN_RISCI1 (1 << 2) 69 #define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */ 70 #define AUD_INT_UP_RISCI2 (1 << 5) 71 #define AUD_INT_RDS_DN_RISCI2 (1 << 6) 72 #define AUD_INT_DN_SYNC (1 << 12) 73 #define AUD_INT_UP_SYNC (1 << 13) 74 #define AUD_INT_RDS_DN_SYNC (1 << 14) 75 #define AUD_INT_OPC_ERR (1 << 16) 76 #define AUD_INT_BER_IRQ (1 << 20) 77 #define AUD_INT_MCHG_IRQ (1 << 21) 78 #define GP_COUNT_CONTROL_RESET 0x3 79 80 static int cx23885_alsa_dma_init(struct cx23885_audio_dev *chip, int nr_pages) 81 { 82 struct cx23885_audio_buffer *buf = chip->buf; 83 struct page *pg; 84 int i; 85 86 buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); 87 if (NULL == buf->vaddr) { 88 dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); 89 return -ENOMEM; 90 } 91 92 dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n", 93 (unsigned long)buf->vaddr, 94 nr_pages << PAGE_SHIFT); 95 96 memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT); 97 buf->nr_pages = nr_pages; 98 99 buf->sglist = vzalloc(buf->nr_pages * sizeof(*buf->sglist)); 100 if (NULL == buf->sglist) 101 goto vzalloc_err; 102 103 sg_init_table(buf->sglist, buf->nr_pages); 104 for (i = 0; i < buf->nr_pages; i++) { 105 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE); 106 if (NULL == pg) 107 goto vmalloc_to_page_err; 108 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0); 109 } 110 return 0; 111 112 vmalloc_to_page_err: 113 vfree(buf->sglist); 114 buf->sglist = NULL; 115 vzalloc_err: 116 vfree(buf->vaddr); 117 buf->vaddr = NULL; 118 return -ENOMEM; 119 } 120 121 static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev) 122 { 123 struct cx23885_audio_buffer *buf = dev->buf; 124 125 buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist, 126 buf->nr_pages, PCI_DMA_FROMDEVICE); 127 128 if (0 == buf->sglen) { 129 pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__); 130 return -ENOMEM; 131 } 132 return 0; 133 } 134 135 static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev) 136 { 137 struct cx23885_audio_buffer *buf = dev->buf; 138 139 if (!buf->sglen) 140 return 0; 141 142 dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE); 143 buf->sglen = 0; 144 return 0; 145 } 146 147 static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf) 148 { 149 vfree(buf->sglist); 150 buf->sglist = NULL; 151 vfree(buf->vaddr); 152 buf->vaddr = NULL; 153 return 0; 154 } 155 156 /* 157 * BOARD Specific: Sets audio DMA 158 */ 159 160 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip) 161 { 162 struct cx23885_audio_buffer *buf = chip->buf; 163 struct cx23885_dev *dev = chip->dev; 164 struct sram_channel *audio_ch = 165 &dev->sram_channels[AUDIO_SRAM_CHANNEL]; 166 167 dprintk(1, "%s()\n", __func__); 168 169 /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ 170 cx_clear(AUD_INT_DMA_CTL, 0x11); 171 172 /* setup fifo + format - out channel */ 173 cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl, 174 buf->risc.dma); 175 176 /* sets bpl size */ 177 cx_write(AUD_INT_A_LNGTH, buf->bpl); 178 179 /* This is required to get good audio (1 seems to be ok) */ 180 cx_write(AUD_INT_A_MODE, 1); 181 182 /* reset counter */ 183 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 184 atomic_set(&chip->count, 0); 185 186 dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d byte buffer\n", 187 buf->bpl, cx_read(audio_ch->cmds_start+12)>>1, 188 chip->num_periods, buf->bpl * chip->num_periods); 189 190 /* Enables corresponding bits at AUD_INT_STAT */ 191 cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 192 AUD_INT_DN_RISCI1); 193 194 /* Clean any pending interrupt bits already set */ 195 cx_write(AUDIO_INT_INT_STAT, ~0); 196 197 /* enable audio irqs */ 198 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT); 199 200 /* start dma */ 201 cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */ 202 cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and 203 RISC enable */ 204 if (audio_debug) 205 cx23885_sram_channel_dump(chip->dev, audio_ch); 206 207 return 0; 208 } 209 210 /* 211 * BOARD Specific: Resets audio DMA 212 */ 213 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip) 214 { 215 struct cx23885_dev *dev = chip->dev; 216 dprintk(1, "Stopping audio DMA\n"); 217 218 /* stop dma */ 219 cx_clear(AUD_INT_DMA_CTL, 0x11); 220 221 /* disable irqs */ 222 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT); 223 cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 224 AUD_INT_DN_RISCI1); 225 226 if (audio_debug) 227 cx23885_sram_channel_dump(chip->dev, 228 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 229 230 return 0; 231 } 232 233 /* 234 * BOARD Specific: Handles audio IRQ 235 */ 236 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask) 237 { 238 struct cx23885_audio_dev *chip = dev->audio_dev; 239 240 if (0 == (status & mask)) 241 return 0; 242 243 cx_write(AUDIO_INT_INT_STAT, status); 244 245 /* risc op code error */ 246 if (status & AUD_INT_OPC_ERR) { 247 pr_warn("%s/1: Audio risc op code error\n", 248 dev->name); 249 cx_clear(AUD_INT_DMA_CTL, 0x11); 250 cx23885_sram_channel_dump(dev, 251 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 252 } 253 if (status & AUD_INT_DN_SYNC) { 254 dprintk(1, "Downstream sync error\n"); 255 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 256 return 1; 257 } 258 /* risc1 downstream */ 259 if (status & AUD_INT_DN_RISCI1) { 260 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT)); 261 snd_pcm_period_elapsed(chip->substream); 262 } 263 /* FIXME: Any other status should deserve a special handling? */ 264 265 return 1; 266 } 267 268 static int dsp_buffer_free(struct cx23885_audio_dev *chip) 269 { 270 struct cx23885_riscmem *risc; 271 272 BUG_ON(!chip->dma_size); 273 274 dprintk(2, "Freeing buffer\n"); 275 cx23885_alsa_dma_unmap(chip); 276 cx23885_alsa_dma_free(chip->buf); 277 risc = &chip->buf->risc; 278 pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma); 279 kfree(chip->buf); 280 281 chip->buf = NULL; 282 chip->dma_size = 0; 283 284 return 0; 285 } 286 287 /**************************************************************************** 288 ALSA PCM Interface 289 ****************************************************************************/ 290 291 /* 292 * Digital hardware definition 293 */ 294 #define DEFAULT_FIFO_SIZE 4096 295 296 static struct snd_pcm_hardware snd_cx23885_digital_hw = { 297 .info = SNDRV_PCM_INFO_MMAP | 298 SNDRV_PCM_INFO_INTERLEAVED | 299 SNDRV_PCM_INFO_BLOCK_TRANSFER | 300 SNDRV_PCM_INFO_MMAP_VALID, 301 .formats = SNDRV_PCM_FMTBIT_S16_LE, 302 303 .rates = SNDRV_PCM_RATE_48000, 304 .rate_min = 48000, 305 .rate_max = 48000, 306 .channels_min = 2, 307 .channels_max = 2, 308 /* Analog audio output will be full of clicks and pops if there 309 are not exactly four lines in the SRAM FIFO buffer. */ 310 .period_bytes_min = DEFAULT_FIFO_SIZE/4, 311 .period_bytes_max = DEFAULT_FIFO_SIZE/4, 312 .periods_min = 1, 313 .periods_max = 1024, 314 .buffer_bytes_max = (1024*1024), 315 }; 316 317 /* 318 * audio pcm capture open callback 319 */ 320 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream) 321 { 322 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 323 struct snd_pcm_runtime *runtime = substream->runtime; 324 int err; 325 326 if (!chip) { 327 pr_err("BUG: cx23885 can't find device struct. Can't proceed with open\n"); 328 return -ENODEV; 329 } 330 331 err = snd_pcm_hw_constraint_pow2(runtime, 0, 332 SNDRV_PCM_HW_PARAM_PERIODS); 333 if (err < 0) 334 goto _error; 335 336 chip->substream = substream; 337 338 runtime->hw = snd_cx23885_digital_hw; 339 340 if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size != 341 DEFAULT_FIFO_SIZE) { 342 unsigned int bpl = chip->dev-> 343 sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4; 344 bpl &= ~7; /* must be multiple of 8 */ 345 runtime->hw.period_bytes_min = bpl; 346 runtime->hw.period_bytes_max = bpl; 347 } 348 349 return 0; 350 _error: 351 dprintk(1, "Error opening PCM!\n"); 352 return err; 353 } 354 355 /* 356 * audio close callback 357 */ 358 static int snd_cx23885_close(struct snd_pcm_substream *substream) 359 { 360 return 0; 361 } 362 363 364 /* 365 * hw_params callback 366 */ 367 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream, 368 struct snd_pcm_hw_params *hw_params) 369 { 370 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 371 struct cx23885_audio_buffer *buf; 372 int ret; 373 374 if (substream->runtime->dma_area) { 375 dsp_buffer_free(chip); 376 substream->runtime->dma_area = NULL; 377 } 378 379 chip->period_size = params_period_bytes(hw_params); 380 chip->num_periods = params_periods(hw_params); 381 chip->dma_size = chip->period_size * params_periods(hw_params); 382 383 BUG_ON(!chip->dma_size); 384 BUG_ON(chip->num_periods & (chip->num_periods-1)); 385 386 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 387 if (NULL == buf) 388 return -ENOMEM; 389 390 buf->bpl = chip->period_size; 391 chip->buf = buf; 392 393 ret = cx23885_alsa_dma_init(chip, 394 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT)); 395 if (ret < 0) 396 goto error; 397 398 ret = cx23885_alsa_dma_map(chip); 399 if (ret < 0) 400 goto error; 401 402 ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist, 403 chip->period_size, chip->num_periods, 1); 404 if (ret < 0) 405 goto error; 406 407 /* Loop back to start of program */ 408 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC); 409 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma); 410 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */ 411 412 substream->runtime->dma_area = chip->buf->vaddr; 413 substream->runtime->dma_bytes = chip->dma_size; 414 substream->runtime->dma_addr = 0; 415 416 return 0; 417 418 error: 419 kfree(buf); 420 chip->buf = NULL; 421 return ret; 422 } 423 424 /* 425 * hw free callback 426 */ 427 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream) 428 { 429 430 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 431 432 if (substream->runtime->dma_area) { 433 dsp_buffer_free(chip); 434 substream->runtime->dma_area = NULL; 435 } 436 437 return 0; 438 } 439 440 /* 441 * prepare callback 442 */ 443 static int snd_cx23885_prepare(struct snd_pcm_substream *substream) 444 { 445 return 0; 446 } 447 448 /* 449 * trigger callback 450 */ 451 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream, 452 int cmd) 453 { 454 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 455 int err; 456 457 /* Local interrupts are already disabled by ALSA */ 458 spin_lock(&chip->lock); 459 460 switch (cmd) { 461 case SNDRV_PCM_TRIGGER_START: 462 err = cx23885_start_audio_dma(chip); 463 break; 464 case SNDRV_PCM_TRIGGER_STOP: 465 err = cx23885_stop_audio_dma(chip); 466 break; 467 default: 468 err = -EINVAL; 469 break; 470 } 471 472 spin_unlock(&chip->lock); 473 474 return err; 475 } 476 477 /* 478 * pointer callback 479 */ 480 static snd_pcm_uframes_t snd_cx23885_pointer( 481 struct snd_pcm_substream *substream) 482 { 483 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 484 struct snd_pcm_runtime *runtime = substream->runtime; 485 u16 count; 486 487 count = atomic_read(&chip->count); 488 489 return runtime->period_size * (count & (runtime->periods-1)); 490 } 491 492 /* 493 * page callback (needed for mmap) 494 */ 495 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream, 496 unsigned long offset) 497 { 498 void *pageptr = substream->runtime->dma_area + offset; 499 return vmalloc_to_page(pageptr); 500 } 501 502 /* 503 * operators 504 */ 505 static const struct snd_pcm_ops snd_cx23885_pcm_ops = { 506 .open = snd_cx23885_pcm_open, 507 .close = snd_cx23885_close, 508 .ioctl = snd_pcm_lib_ioctl, 509 .hw_params = snd_cx23885_hw_params, 510 .hw_free = snd_cx23885_hw_free, 511 .prepare = snd_cx23885_prepare, 512 .trigger = snd_cx23885_card_trigger, 513 .pointer = snd_cx23885_pointer, 514 .page = snd_cx23885_page, 515 }; 516 517 /* 518 * create a PCM device 519 */ 520 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device, 521 char *name) 522 { 523 int err; 524 struct snd_pcm *pcm; 525 526 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm); 527 if (err < 0) 528 return err; 529 pcm->private_data = chip; 530 strcpy(pcm->name, name); 531 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops); 532 533 return 0; 534 } 535 536 /**************************************************************************** 537 Basic Flow for Sound Devices 538 ****************************************************************************/ 539 540 /* 541 * Alsa Constructor - Component probe 542 */ 543 544 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev) 545 { 546 struct snd_card *card; 547 struct cx23885_audio_dev *chip; 548 int err; 549 550 if (disable_analog_audio) 551 return NULL; 552 553 if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) { 554 pr_warn("%s(): Missing SRAM channel configuration for analog TV Audio\n", 555 __func__); 556 return NULL; 557 } 558 559 err = snd_card_new(&dev->pci->dev, 560 SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, 561 THIS_MODULE, sizeof(struct cx23885_audio_dev), &card); 562 if (err < 0) 563 goto error; 564 565 chip = (struct cx23885_audio_dev *) card->private_data; 566 chip->dev = dev; 567 chip->pci = dev->pci; 568 chip->card = card; 569 spin_lock_init(&chip->lock); 570 571 err = snd_cx23885_pcm(chip, 0, "CX23885 Digital"); 572 if (err < 0) 573 goto error; 574 575 strcpy(card->driver, "CX23885"); 576 sprintf(card->shortname, "Conexant CX23885"); 577 sprintf(card->longname, "%s at %s", card->shortname, dev->name); 578 579 err = snd_card_register(card); 580 if (err < 0) 581 goto error; 582 583 dprintk(0, "registered ALSA audio device\n"); 584 585 return chip; 586 587 error: 588 snd_card_free(card); 589 pr_err("%s(): Failed to register analog audio adapter\n", 590 __func__); 591 592 return NULL; 593 } 594 595 /* 596 * ALSA destructor 597 */ 598 void cx23885_audio_unregister(struct cx23885_dev *dev) 599 { 600 struct cx23885_audio_dev *chip = dev->audio_dev; 601 602 snd_card_free(chip->card); 603 } 604