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 	.hw_params = snd_cx23885_hw_params,
499 	.hw_free = snd_cx23885_hw_free,
500 	.prepare = snd_cx23885_prepare,
501 	.trigger = snd_cx23885_card_trigger,
502 	.pointer = snd_cx23885_pointer,
503 	.page = snd_cx23885_page,
504 };
505 
506 /*
507  * create a PCM device
508  */
509 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
510 	char *name)
511 {
512 	int err;
513 	struct snd_pcm *pcm;
514 
515 	err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
516 	if (err < 0)
517 		return err;
518 	pcm->private_data = chip;
519 	strscpy(pcm->name, name, sizeof(pcm->name));
520 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
521 
522 	return 0;
523 }
524 
525 /****************************************************************************
526 			Basic Flow for Sound Devices
527  ****************************************************************************/
528 
529 /*
530  * Alsa Constructor - Component probe
531  */
532 
533 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
534 {
535 	struct snd_card *card;
536 	struct cx23885_audio_dev *chip;
537 	int err;
538 
539 	if (disable_analog_audio)
540 		return NULL;
541 
542 	if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
543 		pr_warn("%s(): Missing SRAM channel configuration for analog TV Audio\n",
544 		       __func__);
545 		return NULL;
546 	}
547 
548 	err = snd_card_new(&dev->pci->dev,
549 			   SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
550 			THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
551 	if (err < 0)
552 		goto error;
553 
554 	chip = (struct cx23885_audio_dev *) card->private_data;
555 	chip->dev = dev;
556 	chip->pci = dev->pci;
557 	chip->card = card;
558 	spin_lock_init(&chip->lock);
559 
560 	err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
561 	if (err < 0)
562 		goto error;
563 
564 	strscpy(card->driver, "CX23885", sizeof(card->driver));
565 	sprintf(card->shortname, "Conexant CX23885");
566 	sprintf(card->longname, "%s at %s", card->shortname, dev->name);
567 
568 	err = snd_card_register(card);
569 	if (err < 0)
570 		goto error;
571 
572 	dprintk(0, "registered ALSA audio device\n");
573 
574 	return chip;
575 
576 error:
577 	snd_card_free(card);
578 	pr_err("%s(): Failed to register analog audio adapter\n",
579 	       __func__);
580 
581 	return NULL;
582 }
583 
584 /*
585  * ALSA destructor
586  */
587 void cx23885_audio_unregister(struct cx23885_dev *dev)
588 {
589 	struct cx23885_audio_dev *chip = dev->audio_dev;
590 
591 	snd_card_free(chip->card);
592 }
593