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 <linux/module.h> 21 #include <linux/init.h> 22 #include <linux/device.h> 23 #include <linux/interrupt.h> 24 #include <linux/vmalloc.h> 25 #include <linux/dma-mapping.h> 26 #include <linux/pci.h> 27 28 #include <asm/delay.h> 29 30 #include <sound/core.h> 31 #include <sound/pcm.h> 32 #include <sound/pcm_params.h> 33 #include <sound/control.h> 34 #include <sound/initval.h> 35 36 #include <sound/tlv.h> 37 38 39 #include "cx23885.h" 40 #include "cx23885-reg.h" 41 42 #define AUDIO_SRAM_CHANNEL SRAM_CH07 43 44 #define dprintk(level, fmt, arg...) do { \ 45 if (audio_debug + 1 > level) \ 46 printk(KERN_INFO "%s: " fmt, chip->dev->name , ## arg); \ 47 } while(0) 48 49 #define dprintk_core(level, fmt, arg...) if (audio_debug >= level) \ 50 printk(KERN_DEBUG "%s: " fmt, chip->dev->name , ## arg) 51 52 /**************************************************************************** 53 Module global static vars 54 ****************************************************************************/ 55 56 static unsigned int disable_analog_audio; 57 module_param(disable_analog_audio, int, 0644); 58 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver"); 59 60 static unsigned int audio_debug; 61 module_param(audio_debug, int, 0644); 62 MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]"); 63 64 /**************************************************************************** 65 Board specific funtions 66 ****************************************************************************/ 67 68 /* Constants taken from cx88-reg.h */ 69 #define AUD_INT_DN_RISCI1 (1 << 0) 70 #define AUD_INT_UP_RISCI1 (1 << 1) 71 #define AUD_INT_RDS_DN_RISCI1 (1 << 2) 72 #define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */ 73 #define AUD_INT_UP_RISCI2 (1 << 5) 74 #define AUD_INT_RDS_DN_RISCI2 (1 << 6) 75 #define AUD_INT_DN_SYNC (1 << 12) 76 #define AUD_INT_UP_SYNC (1 << 13) 77 #define AUD_INT_RDS_DN_SYNC (1 << 14) 78 #define AUD_INT_OPC_ERR (1 << 16) 79 #define AUD_INT_BER_IRQ (1 << 20) 80 #define AUD_INT_MCHG_IRQ (1 << 21) 81 #define GP_COUNT_CONTROL_RESET 0x3 82 83 static int cx23885_alsa_dma_init(struct cx23885_audio_dev *chip, int nr_pages) 84 { 85 struct cx23885_audio_buffer *buf = chip->buf; 86 struct page *pg; 87 int i; 88 89 buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); 90 if (NULL == buf->vaddr) { 91 dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); 92 return -ENOMEM; 93 } 94 95 dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n", 96 (unsigned long)buf->vaddr, 97 nr_pages << PAGE_SHIFT); 98 99 memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT); 100 buf->nr_pages = nr_pages; 101 102 buf->sglist = vzalloc(buf->nr_pages * sizeof(*buf->sglist)); 103 if (NULL == buf->sglist) 104 goto vzalloc_err; 105 106 sg_init_table(buf->sglist, buf->nr_pages); 107 for (i = 0; i < buf->nr_pages; i++) { 108 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE); 109 if (NULL == pg) 110 goto vmalloc_to_page_err; 111 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0); 112 } 113 return 0; 114 115 vmalloc_to_page_err: 116 vfree(buf->sglist); 117 buf->sglist = NULL; 118 vzalloc_err: 119 vfree(buf->vaddr); 120 buf->vaddr = NULL; 121 return -ENOMEM; 122 } 123 124 static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev) 125 { 126 struct cx23885_audio_buffer *buf = dev->buf; 127 128 buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist, 129 buf->nr_pages, PCI_DMA_FROMDEVICE); 130 131 if (0 == buf->sglen) { 132 pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__); 133 return -ENOMEM; 134 } 135 return 0; 136 } 137 138 static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev) 139 { 140 struct cx23885_audio_buffer *buf = dev->buf; 141 142 if (!buf->sglen) 143 return 0; 144 145 dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE); 146 buf->sglen = 0; 147 return 0; 148 } 149 150 static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf) 151 { 152 vfree(buf->sglist); 153 buf->sglist = NULL; 154 vfree(buf->vaddr); 155 buf->vaddr = NULL; 156 return 0; 157 } 158 159 /* 160 * BOARD Specific: Sets audio DMA 161 */ 162 163 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip) 164 { 165 struct cx23885_audio_buffer *buf = chip->buf; 166 struct cx23885_dev *dev = chip->dev; 167 struct sram_channel *audio_ch = 168 &dev->sram_channels[AUDIO_SRAM_CHANNEL]; 169 170 dprintk(1, "%s()\n", __func__); 171 172 /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ 173 cx_clear(AUD_INT_DMA_CTL, 0x11); 174 175 /* setup fifo + format - out channel */ 176 cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl, 177 buf->risc.dma); 178 179 /* sets bpl size */ 180 cx_write(AUD_INT_A_LNGTH, buf->bpl); 181 182 /* This is required to get good audio (1 seems to be ok) */ 183 cx_write(AUD_INT_A_MODE, 1); 184 185 /* reset counter */ 186 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 187 atomic_set(&chip->count, 0); 188 189 dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d " 190 "byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start+12)>>1, 191 chip->num_periods, buf->bpl * chip->num_periods); 192 193 /* Enables corresponding bits at AUD_INT_STAT */ 194 cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 195 AUD_INT_DN_RISCI1); 196 197 /* Clean any pending interrupt bits already set */ 198 cx_write(AUDIO_INT_INT_STAT, ~0); 199 200 /* enable audio irqs */ 201 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT); 202 203 /* start dma */ 204 cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */ 205 cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and 206 RISC enable */ 207 if (audio_debug) 208 cx23885_sram_channel_dump(chip->dev, audio_ch); 209 210 return 0; 211 } 212 213 /* 214 * BOARD Specific: Resets audio DMA 215 */ 216 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip) 217 { 218 struct cx23885_dev *dev = chip->dev; 219 dprintk(1, "Stopping audio DMA\n"); 220 221 /* stop dma */ 222 cx_clear(AUD_INT_DMA_CTL, 0x11); 223 224 /* disable irqs */ 225 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT); 226 cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 227 AUD_INT_DN_RISCI1); 228 229 if (audio_debug) 230 cx23885_sram_channel_dump(chip->dev, 231 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 232 233 return 0; 234 } 235 236 /* 237 * BOARD Specific: Handles audio IRQ 238 */ 239 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask) 240 { 241 struct cx23885_audio_dev *chip = dev->audio_dev; 242 243 if (0 == (status & mask)) 244 return 0; 245 246 cx_write(AUDIO_INT_INT_STAT, status); 247 248 /* risc op code error */ 249 if (status & AUD_INT_OPC_ERR) { 250 printk(KERN_WARNING "%s/1: Audio risc op code error\n", 251 dev->name); 252 cx_clear(AUD_INT_DMA_CTL, 0x11); 253 cx23885_sram_channel_dump(dev, 254 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 255 } 256 if (status & AUD_INT_DN_SYNC) { 257 dprintk(1, "Downstream sync error\n"); 258 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 259 return 1; 260 } 261 /* risc1 downstream */ 262 if (status & AUD_INT_DN_RISCI1) { 263 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT)); 264 snd_pcm_period_elapsed(chip->substream); 265 } 266 /* FIXME: Any other status should deserve a special handling? */ 267 268 return 1; 269 } 270 271 static int dsp_buffer_free(struct cx23885_audio_dev *chip) 272 { 273 struct cx23885_riscmem *risc; 274 275 BUG_ON(!chip->dma_size); 276 277 dprintk(2, "Freeing buffer\n"); 278 cx23885_alsa_dma_unmap(chip); 279 cx23885_alsa_dma_free(chip->buf); 280 risc = &chip->buf->risc; 281 pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma); 282 kfree(chip->buf); 283 284 chip->buf = NULL; 285 chip->dma_size = 0; 286 287 return 0; 288 } 289 290 /**************************************************************************** 291 ALSA PCM Interface 292 ****************************************************************************/ 293 294 /* 295 * Digital hardware definition 296 */ 297 #define DEFAULT_FIFO_SIZE 4096 298 299 static struct snd_pcm_hardware snd_cx23885_digital_hw = { 300 .info = SNDRV_PCM_INFO_MMAP | 301 SNDRV_PCM_INFO_INTERLEAVED | 302 SNDRV_PCM_INFO_BLOCK_TRANSFER | 303 SNDRV_PCM_INFO_MMAP_VALID, 304 .formats = SNDRV_PCM_FMTBIT_S16_LE, 305 306 .rates = SNDRV_PCM_RATE_48000, 307 .rate_min = 48000, 308 .rate_max = 48000, 309 .channels_min = 2, 310 .channels_max = 2, 311 /* Analog audio output will be full of clicks and pops if there 312 are not exactly four lines in the SRAM FIFO buffer. */ 313 .period_bytes_min = DEFAULT_FIFO_SIZE/4, 314 .period_bytes_max = DEFAULT_FIFO_SIZE/4, 315 .periods_min = 1, 316 .periods_max = 1024, 317 .buffer_bytes_max = (1024*1024), 318 }; 319 320 /* 321 * audio pcm capture open callback 322 */ 323 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream) 324 { 325 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 326 struct snd_pcm_runtime *runtime = substream->runtime; 327 int err; 328 329 if (!chip) { 330 printk(KERN_ERR "BUG: cx23885 can't find device struct." 331 " Can't proceed with open\n"); 332 return -ENODEV; 333 } 334 335 err = snd_pcm_hw_constraint_pow2(runtime, 0, 336 SNDRV_PCM_HW_PARAM_PERIODS); 337 if (err < 0) 338 goto _error; 339 340 chip->substream = substream; 341 342 runtime->hw = snd_cx23885_digital_hw; 343 344 if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size != 345 DEFAULT_FIFO_SIZE) { 346 unsigned int bpl = chip->dev-> 347 sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4; 348 bpl &= ~7; /* must be multiple of 8 */ 349 runtime->hw.period_bytes_min = bpl; 350 runtime->hw.period_bytes_max = bpl; 351 } 352 353 return 0; 354 _error: 355 dprintk(1, "Error opening PCM!\n"); 356 return err; 357 } 358 359 /* 360 * audio close callback 361 */ 362 static int snd_cx23885_close(struct snd_pcm_substream *substream) 363 { 364 return 0; 365 } 366 367 368 /* 369 * hw_params callback 370 */ 371 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream, 372 struct snd_pcm_hw_params *hw_params) 373 { 374 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 375 struct cx23885_audio_buffer *buf; 376 int ret; 377 378 if (substream->runtime->dma_area) { 379 dsp_buffer_free(chip); 380 substream->runtime->dma_area = NULL; 381 } 382 383 chip->period_size = params_period_bytes(hw_params); 384 chip->num_periods = params_periods(hw_params); 385 chip->dma_size = chip->period_size * params_periods(hw_params); 386 387 BUG_ON(!chip->dma_size); 388 BUG_ON(chip->num_periods & (chip->num_periods-1)); 389 390 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 391 if (NULL == buf) 392 return -ENOMEM; 393 394 buf->bpl = chip->period_size; 395 chip->buf = buf; 396 397 ret = cx23885_alsa_dma_init(chip, 398 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT)); 399 if (ret < 0) 400 goto error; 401 402 ret = cx23885_alsa_dma_map(chip); 403 if (ret < 0) 404 goto error; 405 406 ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist, 407 chip->period_size, chip->num_periods, 1); 408 if (ret < 0) 409 goto error; 410 411 /* Loop back to start of program */ 412 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC); 413 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma); 414 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */ 415 416 substream->runtime->dma_area = chip->buf->vaddr; 417 substream->runtime->dma_bytes = chip->dma_size; 418 substream->runtime->dma_addr = 0; 419 420 return 0; 421 422 error: 423 kfree(buf); 424 chip->buf = NULL; 425 return ret; 426 } 427 428 /* 429 * hw free callback 430 */ 431 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream) 432 { 433 434 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 435 436 if (substream->runtime->dma_area) { 437 dsp_buffer_free(chip); 438 substream->runtime->dma_area = NULL; 439 } 440 441 return 0; 442 } 443 444 /* 445 * prepare callback 446 */ 447 static int snd_cx23885_prepare(struct snd_pcm_substream *substream) 448 { 449 return 0; 450 } 451 452 /* 453 * trigger callback 454 */ 455 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream, 456 int cmd) 457 { 458 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 459 int err; 460 461 /* Local interrupts are already disabled by ALSA */ 462 spin_lock(&chip->lock); 463 464 switch (cmd) { 465 case SNDRV_PCM_TRIGGER_START: 466 err = cx23885_start_audio_dma(chip); 467 break; 468 case SNDRV_PCM_TRIGGER_STOP: 469 err = cx23885_stop_audio_dma(chip); 470 break; 471 default: 472 err = -EINVAL; 473 break; 474 } 475 476 spin_unlock(&chip->lock); 477 478 return err; 479 } 480 481 /* 482 * pointer callback 483 */ 484 static snd_pcm_uframes_t snd_cx23885_pointer( 485 struct snd_pcm_substream *substream) 486 { 487 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 488 struct snd_pcm_runtime *runtime = substream->runtime; 489 u16 count; 490 491 count = atomic_read(&chip->count); 492 493 return runtime->period_size * (count & (runtime->periods-1)); 494 } 495 496 /* 497 * page callback (needed for mmap) 498 */ 499 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream, 500 unsigned long offset) 501 { 502 void *pageptr = substream->runtime->dma_area + offset; 503 return vmalloc_to_page(pageptr); 504 } 505 506 /* 507 * operators 508 */ 509 static struct snd_pcm_ops snd_cx23885_pcm_ops = { 510 .open = snd_cx23885_pcm_open, 511 .close = snd_cx23885_close, 512 .ioctl = snd_pcm_lib_ioctl, 513 .hw_params = snd_cx23885_hw_params, 514 .hw_free = snd_cx23885_hw_free, 515 .prepare = snd_cx23885_prepare, 516 .trigger = snd_cx23885_card_trigger, 517 .pointer = snd_cx23885_pointer, 518 .page = snd_cx23885_page, 519 }; 520 521 /* 522 * create a PCM device 523 */ 524 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device, 525 char *name) 526 { 527 int err; 528 struct snd_pcm *pcm; 529 530 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm); 531 if (err < 0) 532 return err; 533 pcm->private_data = chip; 534 strcpy(pcm->name, name); 535 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops); 536 537 return 0; 538 } 539 540 /**************************************************************************** 541 Basic Flow for Sound Devices 542 ****************************************************************************/ 543 544 /* 545 * Alsa Constructor - Component probe 546 */ 547 548 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev) 549 { 550 struct snd_card *card; 551 struct cx23885_audio_dev *chip; 552 int err; 553 554 if (disable_analog_audio) 555 return NULL; 556 557 if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) { 558 printk(KERN_WARNING "%s(): Missing SRAM channel configuration " 559 "for analog TV Audio\n", __func__); 560 return NULL; 561 } 562 563 err = snd_card_new(&dev->pci->dev, 564 SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, 565 THIS_MODULE, sizeof(struct cx23885_audio_dev), &card); 566 if (err < 0) 567 goto error; 568 569 chip = (struct cx23885_audio_dev *) card->private_data; 570 chip->dev = dev; 571 chip->pci = dev->pci; 572 chip->card = card; 573 spin_lock_init(&chip->lock); 574 575 err = snd_cx23885_pcm(chip, 0, "CX23885 Digital"); 576 if (err < 0) 577 goto error; 578 579 strcpy(card->driver, "CX23885"); 580 sprintf(card->shortname, "Conexant CX23885"); 581 sprintf(card->longname, "%s at %s", card->shortname, dev->name); 582 583 err = snd_card_register(card); 584 if (err < 0) 585 goto error; 586 587 dprintk(0, "registered ALSA audio device\n"); 588 589 return chip; 590 591 error: 592 snd_card_free(card); 593 printk(KERN_ERR "%s(): Failed to register analog " 594 "audio adapter\n", __func__); 595 596 return NULL; 597 } 598 599 /* 600 * ALSA destructor 601 */ 602 void cx23885_audio_unregister(struct cx23885_dev *dev) 603 { 604 struct cx23885_audio_dev *chip = dev->audio_dev; 605 606 snd_card_free(chip->card); 607 } 608