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 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/device.h> 27 #include <linux/interrupt.h> 28 #include <linux/vmalloc.h> 29 #include <linux/dma-mapping.h> 30 #include <linux/pci.h> 31 32 #include <asm/delay.h> 33 34 #include <sound/core.h> 35 #include <sound/pcm.h> 36 #include <sound/pcm_params.h> 37 #include <sound/control.h> 38 #include <sound/initval.h> 39 40 #include <sound/tlv.h> 41 42 43 #include "cx23885.h" 44 #include "cx23885-reg.h" 45 46 #define AUDIO_SRAM_CHANNEL SRAM_CH07 47 48 #define dprintk(level, fmt, arg...) if (audio_debug >= level) \ 49 printk(KERN_INFO "%s: " fmt, chip->dev->name , ## arg) 50 51 #define dprintk_core(level, fmt, arg...) if (audio_debug >= level) \ 52 printk(KERN_DEBUG "%s: " fmt, chip->dev->name , ## arg) 53 54 /**************************************************************************** 55 Module global static vars 56 ****************************************************************************/ 57 58 static unsigned int disable_analog_audio; 59 module_param(disable_analog_audio, int, 0644); 60 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver"); 61 62 static unsigned int audio_debug; 63 module_param(audio_debug, int, 0644); 64 MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]"); 65 66 /**************************************************************************** 67 Board specific funtions 68 ****************************************************************************/ 69 70 /* Constants taken from cx88-reg.h */ 71 #define AUD_INT_DN_RISCI1 (1 << 0) 72 #define AUD_INT_UP_RISCI1 (1 << 1) 73 #define AUD_INT_RDS_DN_RISCI1 (1 << 2) 74 #define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */ 75 #define AUD_INT_UP_RISCI2 (1 << 5) 76 #define AUD_INT_RDS_DN_RISCI2 (1 << 6) 77 #define AUD_INT_DN_SYNC (1 << 12) 78 #define AUD_INT_UP_SYNC (1 << 13) 79 #define AUD_INT_RDS_DN_SYNC (1 << 14) 80 #define AUD_INT_OPC_ERR (1 << 16) 81 #define AUD_INT_BER_IRQ (1 << 20) 82 #define AUD_INT_MCHG_IRQ (1 << 21) 83 #define GP_COUNT_CONTROL_RESET 0x3 84 85 /* 86 * BOARD Specific: Sets audio DMA 87 */ 88 89 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip) 90 { 91 struct cx23885_audio_buffer *buf = chip->buf; 92 struct cx23885_dev *dev = chip->dev; 93 struct sram_channel *audio_ch = 94 &dev->sram_channels[AUDIO_SRAM_CHANNEL]; 95 96 dprintk(1, "%s()\n", __func__); 97 98 /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ 99 cx_clear(AUD_INT_DMA_CTL, 0x11); 100 101 /* setup fifo + format - out channel */ 102 cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl, 103 buf->risc.dma); 104 105 /* sets bpl size */ 106 cx_write(AUD_INT_A_LNGTH, buf->bpl); 107 108 /* This is required to get good audio (1 seems to be ok) */ 109 cx_write(AUD_INT_A_MODE, 1); 110 111 /* reset counter */ 112 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 113 atomic_set(&chip->count, 0); 114 115 dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d " 116 "byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start+12)>>1, 117 chip->num_periods, buf->bpl * chip->num_periods); 118 119 /* Enables corresponding bits at AUD_INT_STAT */ 120 cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 121 AUD_INT_DN_RISCI1); 122 123 /* Clean any pending interrupt bits already set */ 124 cx_write(AUDIO_INT_INT_STAT, ~0); 125 126 /* enable audio irqs */ 127 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT); 128 129 /* start dma */ 130 cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */ 131 cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and 132 RISC enable */ 133 if (audio_debug) 134 cx23885_sram_channel_dump(chip->dev, audio_ch); 135 136 return 0; 137 } 138 139 /* 140 * BOARD Specific: Resets audio DMA 141 */ 142 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip) 143 { 144 struct cx23885_dev *dev = chip->dev; 145 dprintk(1, "Stopping audio DMA\n"); 146 147 /* stop dma */ 148 cx_clear(AUD_INT_DMA_CTL, 0x11); 149 150 /* disable irqs */ 151 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT); 152 cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 153 AUD_INT_DN_RISCI1); 154 155 if (audio_debug) 156 cx23885_sram_channel_dump(chip->dev, 157 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 158 159 return 0; 160 } 161 162 /* 163 * BOARD Specific: Handles audio IRQ 164 */ 165 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask) 166 { 167 struct cx23885_audio_dev *chip = dev->audio_dev; 168 169 if (0 == (status & mask)) 170 return 0; 171 172 cx_write(AUDIO_INT_INT_STAT, status); 173 174 /* risc op code error */ 175 if (status & AUD_INT_OPC_ERR) { 176 printk(KERN_WARNING "%s/1: Audio risc op code error\n", 177 dev->name); 178 cx_clear(AUD_INT_DMA_CTL, 0x11); 179 cx23885_sram_channel_dump(dev, 180 &dev->sram_channels[AUDIO_SRAM_CHANNEL]); 181 } 182 if (status & AUD_INT_DN_SYNC) { 183 dprintk(1, "Downstream sync error\n"); 184 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 185 return 1; 186 } 187 /* risc1 downstream */ 188 if (status & AUD_INT_DN_RISCI1) { 189 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT)); 190 snd_pcm_period_elapsed(chip->substream); 191 } 192 /* FIXME: Any other status should deserve a special handling? */ 193 194 return 1; 195 } 196 197 static int dsp_buffer_free(struct cx23885_audio_dev *chip) 198 { 199 BUG_ON(!chip->dma_size); 200 201 dprintk(2, "Freeing buffer\n"); 202 videobuf_dma_unmap(&chip->pci->dev, chip->dma_risc); 203 videobuf_dma_free(chip->dma_risc); 204 btcx_riscmem_free(chip->pci, &chip->buf->risc); 205 kfree(chip->buf); 206 207 chip->dma_risc = NULL; 208 chip->dma_size = 0; 209 210 return 0; 211 } 212 213 /**************************************************************************** 214 ALSA PCM Interface 215 ****************************************************************************/ 216 217 /* 218 * Digital hardware definition 219 */ 220 #define DEFAULT_FIFO_SIZE 4096 221 222 static struct snd_pcm_hardware snd_cx23885_digital_hw = { 223 .info = SNDRV_PCM_INFO_MMAP | 224 SNDRV_PCM_INFO_INTERLEAVED | 225 SNDRV_PCM_INFO_BLOCK_TRANSFER | 226 SNDRV_PCM_INFO_MMAP_VALID, 227 .formats = SNDRV_PCM_FMTBIT_S16_LE, 228 229 .rates = SNDRV_PCM_RATE_48000, 230 .rate_min = 48000, 231 .rate_max = 48000, 232 .channels_min = 2, 233 .channels_max = 2, 234 /* Analog audio output will be full of clicks and pops if there 235 are not exactly four lines in the SRAM FIFO buffer. */ 236 .period_bytes_min = DEFAULT_FIFO_SIZE/4, 237 .period_bytes_max = DEFAULT_FIFO_SIZE/4, 238 .periods_min = 1, 239 .periods_max = 1024, 240 .buffer_bytes_max = (1024*1024), 241 }; 242 243 /* 244 * audio pcm capture open callback 245 */ 246 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream) 247 { 248 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 249 struct snd_pcm_runtime *runtime = substream->runtime; 250 int err; 251 252 if (!chip) { 253 printk(KERN_ERR "BUG: cx23885 can't find device struct." 254 " Can't proceed with open\n"); 255 return -ENODEV; 256 } 257 258 err = snd_pcm_hw_constraint_pow2(runtime, 0, 259 SNDRV_PCM_HW_PARAM_PERIODS); 260 if (err < 0) 261 goto _error; 262 263 chip->substream = substream; 264 265 runtime->hw = snd_cx23885_digital_hw; 266 267 if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size != 268 DEFAULT_FIFO_SIZE) { 269 unsigned int bpl = chip->dev-> 270 sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4; 271 bpl &= ~7; /* must be multiple of 8 */ 272 runtime->hw.period_bytes_min = bpl; 273 runtime->hw.period_bytes_max = bpl; 274 } 275 276 return 0; 277 _error: 278 dprintk(1, "Error opening PCM!\n"); 279 return err; 280 } 281 282 /* 283 * audio close callback 284 */ 285 static int snd_cx23885_close(struct snd_pcm_substream *substream) 286 { 287 return 0; 288 } 289 290 /* 291 * hw_params callback 292 */ 293 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream, 294 struct snd_pcm_hw_params *hw_params) 295 { 296 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 297 struct videobuf_dmabuf *dma; 298 299 struct cx23885_audio_buffer *buf; 300 int ret; 301 302 if (substream->runtime->dma_area) { 303 dsp_buffer_free(chip); 304 substream->runtime->dma_area = NULL; 305 } 306 307 chip->period_size = params_period_bytes(hw_params); 308 chip->num_periods = params_periods(hw_params); 309 chip->dma_size = chip->period_size * params_periods(hw_params); 310 311 BUG_ON(!chip->dma_size); 312 BUG_ON(chip->num_periods & (chip->num_periods-1)); 313 314 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 315 if (NULL == buf) 316 return -ENOMEM; 317 318 buf->bpl = chip->period_size; 319 320 dma = &buf->dma; 321 videobuf_dma_init(dma); 322 ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE, 323 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT)); 324 if (ret < 0) 325 goto error; 326 327 ret = videobuf_dma_map(&chip->pci->dev, dma); 328 if (ret < 0) 329 goto error; 330 331 ret = cx23885_risc_databuffer(chip->pci, &buf->risc, dma->sglist, 332 chip->period_size, chip->num_periods, 1); 333 if (ret < 0) 334 goto error; 335 336 /* Loop back to start of program */ 337 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC); 338 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma); 339 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */ 340 341 chip->buf = buf; 342 chip->dma_risc = dma; 343 344 substream->runtime->dma_area = chip->dma_risc->vaddr; 345 substream->runtime->dma_bytes = chip->dma_size; 346 substream->runtime->dma_addr = 0; 347 348 return 0; 349 350 error: 351 kfree(buf); 352 return ret; 353 } 354 355 /* 356 * hw free callback 357 */ 358 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream) 359 { 360 361 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 362 363 if (substream->runtime->dma_area) { 364 dsp_buffer_free(chip); 365 substream->runtime->dma_area = NULL; 366 } 367 368 return 0; 369 } 370 371 /* 372 * prepare callback 373 */ 374 static int snd_cx23885_prepare(struct snd_pcm_substream *substream) 375 { 376 return 0; 377 } 378 379 /* 380 * trigger callback 381 */ 382 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream, 383 int cmd) 384 { 385 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 386 int err; 387 388 /* Local interrupts are already disabled by ALSA */ 389 spin_lock(&chip->lock); 390 391 switch (cmd) { 392 case SNDRV_PCM_TRIGGER_START: 393 err = cx23885_start_audio_dma(chip); 394 break; 395 case SNDRV_PCM_TRIGGER_STOP: 396 err = cx23885_stop_audio_dma(chip); 397 break; 398 default: 399 err = -EINVAL; 400 break; 401 } 402 403 spin_unlock(&chip->lock); 404 405 return err; 406 } 407 408 /* 409 * pointer callback 410 */ 411 static snd_pcm_uframes_t snd_cx23885_pointer( 412 struct snd_pcm_substream *substream) 413 { 414 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); 415 struct snd_pcm_runtime *runtime = substream->runtime; 416 u16 count; 417 418 count = atomic_read(&chip->count); 419 420 return runtime->period_size * (count & (runtime->periods-1)); 421 } 422 423 /* 424 * page callback (needed for mmap) 425 */ 426 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream, 427 unsigned long offset) 428 { 429 void *pageptr = substream->runtime->dma_area + offset; 430 return vmalloc_to_page(pageptr); 431 } 432 433 /* 434 * operators 435 */ 436 static struct snd_pcm_ops snd_cx23885_pcm_ops = { 437 .open = snd_cx23885_pcm_open, 438 .close = snd_cx23885_close, 439 .ioctl = snd_pcm_lib_ioctl, 440 .hw_params = snd_cx23885_hw_params, 441 .hw_free = snd_cx23885_hw_free, 442 .prepare = snd_cx23885_prepare, 443 .trigger = snd_cx23885_card_trigger, 444 .pointer = snd_cx23885_pointer, 445 .page = snd_cx23885_page, 446 }; 447 448 /* 449 * create a PCM device 450 */ 451 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device, 452 char *name) 453 { 454 int err; 455 struct snd_pcm *pcm; 456 457 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm); 458 if (err < 0) 459 return err; 460 pcm->private_data = chip; 461 strcpy(pcm->name, name); 462 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops); 463 464 return 0; 465 } 466 467 /**************************************************************************** 468 Basic Flow for Sound Devices 469 ****************************************************************************/ 470 471 /* 472 * Alsa Constructor - Component probe 473 */ 474 475 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev) 476 { 477 struct snd_card *card; 478 struct cx23885_audio_dev *chip; 479 int err; 480 481 if (disable_analog_audio) 482 return NULL; 483 484 if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) { 485 printk(KERN_WARNING "%s(): Missing SRAM channel configuration " 486 "for analog TV Audio\n", __func__); 487 return NULL; 488 } 489 490 err = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, 491 THIS_MODULE, sizeof(struct cx23885_audio_dev), &card); 492 if (err < 0) 493 goto error; 494 495 chip = (struct cx23885_audio_dev *) card->private_data; 496 chip->dev = dev; 497 chip->pci = dev->pci; 498 chip->card = card; 499 spin_lock_init(&chip->lock); 500 501 snd_card_set_dev(card, &dev->pci->dev); 502 503 err = snd_cx23885_pcm(chip, 0, "CX23885 Digital"); 504 if (err < 0) 505 goto error; 506 507 strcpy(card->driver, "CX23885"); 508 sprintf(card->shortname, "Conexant CX23885"); 509 sprintf(card->longname, "%s at %s", card->shortname, dev->name); 510 511 err = snd_card_register(card); 512 if (err < 0) 513 goto error; 514 515 dprintk(0, "registered ALSA audio device\n"); 516 517 return chip; 518 519 error: 520 snd_card_free(card); 521 printk(KERN_ERR "%s(): Failed to register analog " 522 "audio adapter\n", __func__); 523 524 return NULL; 525 } 526 527 /* 528 * ALSA destructor 529 */ 530 void cx23885_audio_unregister(struct cx23885_dev *dev) 531 { 532 struct cx23885_audio_dev *chip = dev->audio_dev; 533 534 snd_card_free(chip->card); 535 } 536