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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
58static unsigned int disable_analog_audio;
59module_param(disable_analog_audio, int, 0644);
60MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
61
62static unsigned int audio_debug;
63module_param(audio_debug, int, 0644);
64MODULE_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
89static 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 */
142static 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 */
165int 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
197static 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
222static 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 */
246static 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 */
285static int snd_cx23885_close(struct snd_pcm_substream *substream)
286{
287 return 0;
288}
289
290/*
291 * hw_params callback
292 */
293static 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
350error:
351 kfree(buf);
352 return ret;
353}
354
355/*
356 * hw free callback
357 */
358static 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 */
374static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
375{
376 return 0;
377}
378
379/*
380 * trigger callback
381 */
382static 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 */
411static 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 */
426static 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 */
436static 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 */
451static 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
475struct 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
519error:
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 */
530void 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}