1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/device.h>
28#include <linux/interrupt.h>
29#include <linux/vmalloc.h>
30#include <linux/dma-mapping.h>
31#include <linux/pci.h>
32#include <linux/slab.h>
33
34#include <linux/delay.h>
35#include <sound/core.h>
36#include <sound/pcm.h>
37#include <sound/pcm_params.h>
38#include <sound/control.h>
39#include <sound/initval.h>
40#include <sound/tlv.h>
41
42#include "cx25821.h"
43#include "cx25821-reg.h"
44
45#define AUDIO_SRAM_CHANNEL SRAM_CH08
46
47#define dprintk(level, fmt, arg...) \
48do { \
49 if (debug >= level) \
50 pr_info("%s/1: " fmt, chip->dev->name, ##arg); \
51} while (0)
52#define dprintk_core(level, fmt, arg...) \
53do { \
54 if (debug >= level) \
55 printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \
56} while (0)
57
58
59
60
61
62static int devno;
63
64struct cx25821_audio_buffer {
65 unsigned int bpl;
66 struct btcx_riscmem risc;
67 struct videobuf_dmabuf dma;
68};
69
70struct cx25821_audio_dev {
71 struct cx25821_dev *dev;
72 struct cx25821_dmaqueue q;
73
74
75 struct pci_dev *pci;
76
77
78 int irq;
79
80 struct snd_card *card;
81
82 unsigned long iobase;
83 spinlock_t reg_lock;
84 atomic_t count;
85
86 unsigned int dma_size;
87 unsigned int period_size;
88 unsigned int num_periods;
89
90 struct videobuf_dmabuf *dma_risc;
91
92 struct cx25821_audio_buffer *buf;
93
94 struct snd_pcm_substream *substream;
95};
96
97
98
99
100
101
102static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
103static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
104static bool enable[SNDRV_CARDS] = { 1, [1 ... (SNDRV_CARDS - 1)] = 1 };
105
106module_param_array(enable, bool, NULL, 0444);
107MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
108
109module_param_array(index, int, NULL, 0444);
110MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
111
112
113
114
115
116MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
117MODULE_AUTHOR("Hiep Huynh");
118MODULE_LICENSE("GPL");
119MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");
120
121static unsigned int debug;
122module_param(debug, int, 0644);
123MODULE_PARM_DESC(debug, "enable debug messages");
124
125
126
127
128
129#define AUD_INT_DN_RISCI1 (1 << 0)
130#define AUD_INT_UP_RISCI1 (1 << 1)
131#define AUD_INT_RDS_DN_RISCI1 (1 << 2)
132#define AUD_INT_DN_RISCI2 (1 << 4)
133#define AUD_INT_UP_RISCI2 (1 << 5)
134#define AUD_INT_RDS_DN_RISCI2 (1 << 6)
135#define AUD_INT_DN_SYNC (1 << 12)
136#define AUD_INT_UP_SYNC (1 << 13)
137#define AUD_INT_RDS_DN_SYNC (1 << 14)
138#define AUD_INT_OPC_ERR (1 << 16)
139#define AUD_INT_BER_IRQ (1 << 20)
140#define AUD_INT_MCHG_IRQ (1 << 21)
141#define GP_COUNT_CONTROL_RESET 0x3
142
143#define PCI_MSK_AUD_EXT (1 << 4)
144#define PCI_MSK_AUD_INT (1 << 3)
145
146
147
148
149static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip)
150{
151 struct cx25821_audio_buffer *buf = chip->buf;
152 struct cx25821_dev *dev = chip->dev;
153 const struct sram_channel *audio_ch =
154 &cx25821_sram_channels[AUDIO_SRAM_CHANNEL];
155 u32 tmp = 0;
156
157
158 cx25821_set_gpiopin_direction(chip->dev, 0, 0);
159
160
161 cx_clear(AUD_INT_DMA_CTL,
162 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
163
164
165 cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
166 buf->risc.dma);
167
168
169 cx_write(AUD_A_LNGTH, buf->bpl);
170
171
172
173 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
174 atomic_set(&chip->count, 0);
175
176
177 tmp = cx_read(AUD_A_CFG);
178 cx_write(AUD_A_CFG, tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE |
179 FLD_AUD_CLK_ENABLE);
180
181
182
183
184
185
186
187
188
189 cx_write(AUD_A_INT_MSK, FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF |
190 FLD_AUD_DST_SYNC | FLD_AUD_DST_OPC_ERR);
191
192
193 cx_write(AUD_A_INT_STAT, ~0);
194
195
196 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
197
198
199 tmp = cx_read(AUD_INT_DMA_CTL);
200 cx_set(AUD_INT_DMA_CTL, tmp |
201 (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN));
202
203 mdelay(100);
204 return 0;
205}
206
207
208
209
210static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip)
211{
212 struct cx25821_dev *dev = chip->dev;
213
214
215 cx_clear(AUD_INT_DMA_CTL,
216 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
217
218
219 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
220 cx_clear(AUD_A_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
221 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
222
223 return 0;
224}
225
226#define MAX_IRQ_LOOP 50
227
228
229
230
231static char *cx25821_aud_irqs[32] = {
232 "dn_risci1", "up_risci1", "rds_dn_risc1",
233 NULL,
234 "dn_risci2", "up_risci2", "rds_dn_risc2",
235 NULL,
236 "dnf_of", "upf_uf", "rds_dnf_uf",
237 NULL,
238 "dn_sync", "up_sync", "rds_dn_sync",
239 NULL,
240 "opc_err", "par_err", "rip_err",
241 "pci_abort", "ber_irq", "mchg_irq"
242};
243
244
245
246
247static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status,
248 u32 mask)
249{
250 struct cx25821_dev *dev = chip->dev;
251
252 if (0 == (status & mask))
253 return;
254
255 cx_write(AUD_A_INT_STAT, status);
256 if (debug > 1 || (status & mask & ~0xff))
257 cx25821_print_irqbits(dev->name, "irq aud", cx25821_aud_irqs,
258 ARRAY_SIZE(cx25821_aud_irqs), status, mask);
259
260
261 if (status & AUD_INT_OPC_ERR) {
262 pr_warn("WARNING %s/1: Audio risc op code error\n", dev->name);
263
264 cx_clear(AUD_INT_DMA_CTL,
265 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
266 cx25821_sram_channel_dump_audio(dev,
267 &cx25821_sram_channels[AUDIO_SRAM_CHANNEL]);
268 }
269 if (status & AUD_INT_DN_SYNC) {
270 pr_warn("WARNING %s: Downstream sync error!\n", dev->name);
271 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
272 return;
273 }
274
275
276 if (status & AUD_INT_DN_RISCI1) {
277 atomic_set(&chip->count, cx_read(AUD_A_GPCNT));
278 snd_pcm_period_elapsed(chip->substream);
279 }
280}
281
282
283
284
285static irqreturn_t cx25821_irq(int irq, void *dev_id)
286{
287 struct cx25821_audio_dev *chip = dev_id;
288 struct cx25821_dev *dev = chip->dev;
289 u32 status, pci_status;
290 u32 audint_status, audint_mask;
291 int loop, handled = 0;
292
293 audint_status = cx_read(AUD_A_INT_STAT);
294 audint_mask = cx_read(AUD_A_INT_MSK);
295 status = cx_read(PCI_INT_STAT);
296
297 for (loop = 0; loop < 1; loop++) {
298 status = cx_read(PCI_INT_STAT);
299 if (0 == status) {
300 status = cx_read(PCI_INT_STAT);
301 audint_status = cx_read(AUD_A_INT_STAT);
302 audint_mask = cx_read(AUD_A_INT_MSK);
303
304 if (status) {
305 handled = 1;
306 cx_write(PCI_INT_STAT, status);
307
308 cx25821_aud_irq(chip, audint_status,
309 audint_mask);
310 break;
311 } else {
312 goto out;
313 }
314 }
315
316 handled = 1;
317 cx_write(PCI_INT_STAT, status);
318
319 cx25821_aud_irq(chip, audint_status, audint_mask);
320 }
321
322 pci_status = cx_read(PCI_INT_STAT);
323
324 if (handled)
325 cx_write(PCI_INT_STAT, pci_status);
326
327out:
328 return IRQ_RETVAL(handled);
329}
330
331static int dsp_buffer_free(struct cx25821_audio_dev *chip)
332{
333 BUG_ON(!chip->dma_size);
334
335 dprintk(2, "Freeing buffer\n");
336 videobuf_dma_unmap(&chip->pci->dev, chip->dma_risc);
337 videobuf_dma_free(chip->dma_risc);
338 btcx_riscmem_free(chip->pci, &chip->buf->risc);
339 kfree(chip->buf);
340
341 chip->dma_risc = NULL;
342 chip->dma_size = 0;
343
344 return 0;
345}
346
347
348
349
350
351
352
353
354#define DEFAULT_FIFO_SIZE 384
355static struct snd_pcm_hardware snd_cx25821_digital_hw = {
356 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
357 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID,
358 .formats = SNDRV_PCM_FMTBIT_S16_LE,
359
360 .rates = SNDRV_PCM_RATE_48000,
361 .rate_min = 48000,
362 .rate_max = 48000,
363 .channels_min = 2,
364 .channels_max = 2,
365
366
367 .period_bytes_min = DEFAULT_FIFO_SIZE / 3,
368 .period_bytes_max = DEFAULT_FIFO_SIZE / 3,
369 .periods_min = 1,
370 .periods_max = AUDIO_LINE_SIZE,
371
372 .buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),
373};
374
375
376
377
378static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
379{
380 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
381 struct snd_pcm_runtime *runtime = substream->runtime;
382 int err;
383 unsigned int bpl = 0;
384
385 if (!chip) {
386 pr_err("DEBUG: cx25821 can't find device struct. Can't proceed with open\n");
387 return -ENODEV;
388 }
389
390 err = snd_pcm_hw_constraint_pow2(runtime, 0,
391 SNDRV_PCM_HW_PARAM_PERIODS);
392 if (err < 0)
393 goto _error;
394
395 chip->substream = substream;
396
397 runtime->hw = snd_cx25821_digital_hw;
398
399 if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
400 DEFAULT_FIFO_SIZE) {
401
402 bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;
403 bpl &= ~7;
404
405 if (bpl > AUDIO_LINE_SIZE)
406 bpl = AUDIO_LINE_SIZE;
407
408 runtime->hw.period_bytes_min = bpl;
409 runtime->hw.period_bytes_max = bpl;
410 }
411
412 return 0;
413_error:
414 dprintk(1, "Error opening PCM!\n");
415 return err;
416}
417
418
419
420
421static int snd_cx25821_close(struct snd_pcm_substream *substream)
422{
423 return 0;
424}
425
426
427
428
429static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
430 struct snd_pcm_hw_params *hw_params)
431{
432 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
433 struct videobuf_dmabuf *dma;
434
435 struct cx25821_audio_buffer *buf;
436 int ret;
437
438 if (substream->runtime->dma_area) {
439 dsp_buffer_free(chip);
440 substream->runtime->dma_area = NULL;
441 }
442
443 chip->period_size = params_period_bytes(hw_params);
444 chip->num_periods = params_periods(hw_params);
445 chip->dma_size = chip->period_size * params_periods(hw_params);
446
447 BUG_ON(!chip->dma_size);
448 BUG_ON(chip->num_periods & (chip->num_periods - 1));
449
450 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
451 if (NULL == buf)
452 return -ENOMEM;
453
454 if (chip->period_size > AUDIO_LINE_SIZE)
455 chip->period_size = AUDIO_LINE_SIZE;
456
457 buf->bpl = chip->period_size;
458
459 dma = &buf->dma;
460 videobuf_dma_init(dma);
461 ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
462 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
463 if (ret < 0)
464 goto error;
465
466 ret = videobuf_dma_map(&chip->pci->dev, dma);
467 if (ret < 0)
468 goto error;
469
470 ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, dma->sglist,
471 chip->period_size, chip->num_periods, 1);
472 if (ret < 0) {
473 pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n");
474 goto error;
475 }
476
477
478 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
479 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
480 buf->risc.jmp[2] = cpu_to_le32(0);
481
482 chip->buf = buf;
483 chip->dma_risc = dma;
484
485 substream->runtime->dma_area = chip->dma_risc->vaddr;
486 substream->runtime->dma_bytes = chip->dma_size;
487 substream->runtime->dma_addr = 0;
488
489 return 0;
490
491error:
492 kfree(buf);
493 return ret;
494}
495
496
497
498
499static int snd_cx25821_hw_free(struct snd_pcm_substream *substream)
500{
501 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
502
503 if (substream->runtime->dma_area) {
504 dsp_buffer_free(chip);
505 substream->runtime->dma_area = NULL;
506 }
507
508 return 0;
509}
510
511
512
513
514static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
515{
516 return 0;
517}
518
519
520
521
522static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream,
523 int cmd)
524{
525 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
526 int err = 0;
527
528
529 spin_lock(&chip->reg_lock);
530
531 switch (cmd) {
532 case SNDRV_PCM_TRIGGER_START:
533 err = _cx25821_start_audio_dma(chip);
534 break;
535 case SNDRV_PCM_TRIGGER_STOP:
536 err = _cx25821_stop_audio_dma(chip);
537 break;
538 default:
539 err = -EINVAL;
540 break;
541 }
542
543 spin_unlock(&chip->reg_lock);
544
545 return err;
546}
547
548
549
550
551static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream
552 *substream)
553{
554 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
555 struct snd_pcm_runtime *runtime = substream->runtime;
556 u16 count;
557
558 count = atomic_read(&chip->count);
559
560 return runtime->period_size * (count & (runtime->periods - 1));
561}
562
563
564
565
566static struct page *snd_cx25821_page(struct snd_pcm_substream *substream,
567 unsigned long offset)
568{
569 void *pageptr = substream->runtime->dma_area + offset;
570
571 return vmalloc_to_page(pageptr);
572}
573
574
575
576
577static struct snd_pcm_ops snd_cx25821_pcm_ops = {
578 .open = snd_cx25821_pcm_open,
579 .close = snd_cx25821_close,
580 .ioctl = snd_pcm_lib_ioctl,
581 .hw_params = snd_cx25821_hw_params,
582 .hw_free = snd_cx25821_hw_free,
583 .prepare = snd_cx25821_prepare,
584 .trigger = snd_cx25821_card_trigger,
585 .pointer = snd_cx25821_pointer,
586 .page = snd_cx25821_page,
587};
588
589
590
591
592
593static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device,
594 char *name)
595{
596 struct snd_pcm *pcm;
597 int err;
598
599 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
600 if (err < 0) {
601 pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__);
602 return err;
603 }
604 pcm->private_data = chip;
605 pcm->info_flags = 0;
606 strcpy(pcm->name, name);
607 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);
608
609 return 0;
610}
611
612
613
614
615
616
617
618
619
620
621static const struct pci_device_id cx25821_audio_pci_tbl[] = {
622 {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
623 {0,}
624};
625
626MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
627
628
629
630
631static int cx25821_audio_initdev(struct cx25821_dev *dev)
632{
633 struct snd_card *card;
634 struct cx25821_audio_dev *chip;
635 int err;
636
637 if (devno >= SNDRV_CARDS) {
638 pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__);
639 return -ENODEV;
640 }
641
642 if (!enable[devno]) {
643 ++devno;
644 pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__);
645 return -ENOENT;
646 }
647
648 err = snd_card_new(&dev->pci->dev, index[devno], id[devno],
649 THIS_MODULE,
650 sizeof(struct cx25821_audio_dev), &card);
651 if (err < 0) {
652 pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n",
653 __func__);
654 return err;
655 }
656
657 strcpy(card->driver, "cx25821");
658
659
660 chip = card->private_data;
661 spin_lock_init(&chip->reg_lock);
662
663 chip->dev = dev;
664 chip->card = card;
665 chip->pci = dev->pci;
666 chip->iobase = pci_resource_start(dev->pci, 0);
667
668 chip->irq = dev->pci->irq;
669
670 err = request_irq(dev->pci->irq, cx25821_irq,
671 IRQF_SHARED, chip->dev->name, chip);
672
673 if (err < 0) {
674 pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name,
675 dev->pci->irq);
676 goto error;
677 }
678
679 err = snd_cx25821_pcm(chip, 0, "cx25821 Digital");
680 if (err < 0) {
681 pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
682 __func__);
683 goto error;
684 }
685
686 strcpy(card->shortname, "cx25821");
687 sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
688 chip->iobase, chip->irq);
689 strcpy(card->mixername, "CX25821");
690
691 pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver,
692 devno);
693
694 err = snd_card_register(card);
695 if (err < 0) {
696 pr_info("DEBUG ERROR: cannot register sound card %s\n",
697 __func__);
698 goto error;
699 }
700
701 dev->card = card;
702 devno++;
703 return 0;
704
705error:
706 snd_card_free(card);
707 return err;
708}
709
710
711
712
713
714static int cx25821_alsa_exit_callback(struct device *dev, void *data)
715{
716 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
717 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
718
719 snd_card_free(cxdev->card);
720 return 0;
721}
722
723static void cx25821_audio_fini(void)
724{
725 struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
726 int ret;
727
728 ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback);
729 if (ret)
730 pr_err("%s failed to find a cx25821 driver.\n", __func__);
731}
732
733static int cx25821_alsa_init_callback(struct device *dev, void *data)
734{
735 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
736 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
737
738 cx25821_audio_initdev(cxdev);
739 return 0;
740}
741
742
743
744
745
746
747
748
749static int cx25821_alsa_init(void)
750{
751 struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
752
753 return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback);
754
755}
756
757late_initcall(cx25821_alsa_init);
758module_exit(cx25821_audio_fini);
759