aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/pci/cx25821/cx25821-audio-upstream.c
blob: 68dbc2dbc9825c5ee3f3de4202fd6e35631e4afc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
/*
 *  Driver for the Conexant CX25821 PCIe bridge
 *
 *  Copyright (C) 2009 Conexant Systems Inc.
 *  Authors  <hiep.huynh@conexant.com>, <shu.lin@conexant.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "cx25821-video.h"
#include "cx25821-audio-upstream.h"

#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/syscalls.h>
#include <linux/file.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
MODULE_LICENSE("GPL");

static int _intr_msk = FLD_AUD_SRC_RISCI1 | FLD_AUD_SRC_OF |
			FLD_AUD_SRC_SYNC | FLD_AUD_SRC_OPC_ERR;

static int cx25821_sram_channel_setup_upstream_audio(struct cx25821_dev *dev,
					      const struct sram_channel *ch,
					      unsigned int bpl, u32 risc)
{
	unsigned int i, lines;
	u32 cdt;

	if (ch->cmds_start == 0) {
		cx_write(ch->ptr1_reg, 0);
		cx_write(ch->ptr2_reg, 0);
		cx_write(ch->cnt2_reg, 0);
		cx_write(ch->cnt1_reg, 0);
		return 0;
	}

	bpl = (bpl + 7) & ~7;	/* alignment */
	cdt = ch->cdt;
	lines = ch->fifo_size / bpl;

	if (lines > 3)
		lines = 3;

	BUG_ON(lines < 2);

	/* write CDT */
	for (i = 0; i < lines; i++) {
		cx_write(cdt + 16 * i, ch->fifo_start + bpl * i);
		cx_write(cdt + 16 * i + 4, 0);
		cx_write(cdt + 16 * i + 8, 0);
		cx_write(cdt + 16 * i + 12, 0);
	}

	/* write CMDS */
	cx_write(ch->cmds_start + 0, risc);

	cx_write(ch->cmds_start + 4, 0);
	cx_write(ch->cmds_start + 8, cdt);
	cx_write(ch->cmds_start + 12, AUDIO_CDT_SIZE_QW);
	cx_write(ch->cmds_start + 16, ch->ctrl_start);

	/* IQ size */
	cx_write(ch->cmds_start + 20, AUDIO_IQ_SIZE_DW);

	for (i = 24; i < 80; i += 4)
		cx_write(ch->cmds_start + i, 0);

	/* fill registers */
	cx_write(ch->ptr1_reg, ch->fifo_start);
	cx_write(ch->ptr2_reg, cdt);
	cx_write(ch->cnt2_reg, AUDIO_CDT_SIZE_QW);
	cx_write(ch->cnt1_reg, AUDIO_CLUSTER_SIZE_QW - 1);

	return 0;
}

static __le32 *cx25821_risc_field_upstream_audio(struct cx25821_dev *dev,
						 __le32 *rp,
						 dma_addr_t databuf_phys_addr,
						 unsigned int bpl,
						 int fifo_enable)
{
	unsigned int line;
	const struct sram_channel *sram_ch =
		dev->channels[dev->_audio_upstream_channel].sram_channels;
	int offset = 0;

	/* scan lines */
	for (line = 0; line < LINES_PER_AUDIO_BUFFER; line++) {
		*(rp++) = cpu_to_le32(RISC_READ | RISC_SOL | RISC_EOL | bpl);
		*(rp++) = cpu_to_le32(databuf_phys_addr + offset);
		*(rp++) = cpu_to_le32(0);	/* bits 63-32 */

		/* Check if we need to enable the FIFO
		 * after the first 3 lines.
		 * For the upstream audio channel,
		 * the risc engine will enable the FIFO */
		if (fifo_enable && line == 2) {
			*(rp++) = RISC_WRITECR;
			*(rp++) = sram_ch->dma_ctl;
			*(rp++) = sram_ch->fld_aud_fifo_en;
			*(rp++) = 0x00000020;
		}

		offset += AUDIO_LINE_SIZE;
	}

	return rp;
}

static int cx25821_risc_buffer_upstream_audio(struct cx25821_dev *dev,
				       struct pci_dev *pci,
				       unsigned int bpl, unsigned int lines)
{
	__le32 *rp;
	int fifo_enable = 0;
	int frame = 0, i = 0;
	int frame_size = AUDIO_DATA_BUF_SZ;
	int databuf_offset = 0;
	int risc_flag = RISC_CNT_INC;
	dma_addr_t risc_phys_jump_addr;

	/* Virtual address of Risc buffer program */
	rp = dev->_risc_virt_addr;

	/* sync instruction */
	*(rp++) = cpu_to_le32(RISC_RESYNC | AUDIO_SYNC_LINE);

	for (frame = 0; frame < NUM_AUDIO_FRAMES; frame++) {
		databuf_offset = frame_size * frame;

		if (frame == 0) {
			fifo_enable = 1;
			risc_flag = RISC_CNT_RESET;
		} else {
			fifo_enable = 0;
			risc_flag = RISC_CNT_INC;
		}

		/* Calculate physical jump address */
		if ((frame + 1) == NUM_AUDIO_FRAMES) {
			risc_phys_jump_addr =
			    dev->_risc_phys_start_addr +
			    RISC_SYNC_INSTRUCTION_SIZE;
		} else {
			risc_phys_jump_addr =
			    dev->_risc_phys_start_addr +
			    RISC_SYNC_INSTRUCTION_SIZE +
			    AUDIO_RISC_DMA_BUF_SIZE * (frame + 1);
		}

		rp = cx25821_risc_field_upstream_audio(dev, rp,
				dev->_audiodata_buf_phys_addr + databuf_offset,
				bpl, fifo_enable);

		if (USE_RISC_NOOP_AUDIO) {
			for (i = 0; i < NUM_NO_OPS; i++)
				*(rp++) = cpu_to_le32(RISC_NOOP);
		}

		/* Loop to (Nth)FrameRISC or to Start of Risc program &
		 * generate IRQ */
		*(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | risc_flag);
		*(rp++) = cpu_to_le32(risc_phys_jump_addr);
		*(rp++) = cpu_to_le32(0);

		/* Recalculate virtual address based on frame index */
		rp = dev->_risc_virt_addr + RISC_SYNC_INSTRUCTION_SIZE / 4 +
			(AUDIO_RISC_DMA_BUF_SIZE * (frame + 1) / 4);
	}

	return 0;
}

static void cx25821_free_memory_audio(struct cx25821_dev *dev)
{
	if (dev->_risc_virt_addr) {
		pci_free_consistent(dev->pci, dev->_audiorisc_size,
				    dev->_risc_virt_addr, dev->_risc_phys_addr);
		dev->_risc_virt_addr = NULL;
	}

	if (dev->_audiodata_buf_virt_addr) {
		pci_free_consistent(dev->pci, dev->_audiodata_buf_size,
				    dev->_audiodata_buf_virt_addr,
				    dev->_audiodata_buf_phys_addr);
		dev->_audiodata_buf_virt_addr = NULL;
	}
}

void cx25821_stop_upstream_audio(struct cx25821_dev *dev)
{
	const struct sram_channel *sram_ch =
		dev->channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B].sram_channels;
	u32 tmp = 0;

	if (!dev->_audio_is_running) {
		printk(KERN_DEBUG
		       pr_fmt("No audio file is currently running so return!\n"));
		return;
	}
	/* Disable RISC interrupts */
	cx_write(sram_ch->int_msk, 0);

	/* Turn OFF risc and fifo enable in AUD_DMA_CNTRL */
	tmp = cx_read(sram_ch->dma_ctl);
	cx_write(sram_ch->dma_ctl,
		 tmp & ~(sram_ch->fld_aud_fifo_en | sram_ch->fld_aud_risc_en));

	/* Clear data buffer memory */
	if (dev->_audiodata_buf_virt_addr)
		memset(dev->_audiodata_buf_virt_addr, 0,
		       dev->_audiodata_buf_size);

	dev->_audio_is_running = 0;
	dev->_is_first_audio_frame = 0;
	dev->_audioframe_count = 0;
	dev->_audiofile_status = END_OF_FILE;

	kfree(dev->_irq_audio_queues);
	dev->_irq_audio_queues = NULL;

	kfree(dev->_audiofilename);
}

void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
{
	if (dev->_audio_is_running)
		cx25821_stop_upstream_audio(dev);

	cx25821_free_memory_audio(dev);
}

static int cx25821_get_audio_data(struct cx25821_dev *dev,
			   const struct sram_channel *sram_ch)
{
	struct file *file;
	int frame_index_temp = dev->_audioframe_index;
	int i = 0;
	int frame_size = AUDIO_DATA_BUF_SZ;
	int frame_offset = frame_size * frame_index_temp;
	char mybuf[AUDIO_LINE_SIZE];
	loff_t file_offset = dev->_audioframe_count * frame_size;
	char *p = NULL;

	if (dev->_audiofile_status == END_OF_FILE)
		return 0;

	file = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
	if (IS_ERR(file)) {
		pr_err("%s(): ERROR opening file(%s) with errno = %ld!\n",
		       __func__, dev->_audiofilename, -PTR_ERR(file));
		return PTR_ERR(file);
	}

	if (dev->_audiodata_buf_virt_addr)
		p = (char *)dev->_audiodata_buf_virt_addr + frame_offset;

	for (i = 0; i < dev->_audio_lines_count; i++) {
		int n = kernel_read(file, file_offset, mybuf, AUDIO_LINE_SIZE);
		if (n < AUDIO_LINE_SIZE) {
			pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
				__func__);
			dev->_audiofile_status = END_OF_FILE;
			fput(file);
			return 0;
		}
		dev->_audiofile_status = IN_PROGRESS;
		if (p) {
			memcpy(p, mybuf, n);
			p += n;
		}
		file_offset += n;
	}
	dev->_audioframe_count++;
	fput(file);

	return 0;
}

static void cx25821_audioups_handler(struct work_struct *work)
{
	struct cx25821_dev *dev = container_of(work, struct cx25821_dev,
			_audio_work_entry);

	if (!dev) {
		pr_err("ERROR %s(): since container_of(work_struct) FAILED!\n",
			__func__);
		return;
	}

	cx25821_get_audio_data(dev, dev->channels[dev->_audio_upstream_channel].
			sram_channels);
}

static int cx25821_openfile_audio(struct cx25821_dev *dev,
			   const struct sram_channel *sram_ch)
{
	char *p = (void *)dev->_audiodata_buf_virt_addr;
	struct file *file;
	loff_t offset;
	int i, j;

	file = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
	if (IS_ERR(file)) {
		pr_err("%s(): ERROR opening file(%s) with errno = %ld!\n",
			__func__, dev->_audiofilename, PTR_ERR(file));
		return PTR_ERR(file);
	}

	for (j = 0, offset = 0; j < NUM_AUDIO_FRAMES; j++) {
		for (i = 0; i < dev->_audio_lines_count; i++) {
			char buf[AUDIO_LINE_SIZE];
			int n = kernel_read(file, offset, buf,
						AUDIO_LINE_SIZE);

			if (n < AUDIO_LINE_SIZE) {
				pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
					__func__);
				dev->_audiofile_status = END_OF_FILE;
				fput(file);
				return 0;
			}

			if (p)
				memcpy(p + offset, buf, n);

			offset += n;
		}
		dev->_audioframe_count++;
	}
	dev->_audiofile_status = IN_PROGRESS;
	fput(file);
	return 0;
}

static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
						 const struct sram_channel *sram_ch,
						 int bpl)
{
	int ret = 0;
	dma_addr_t dma_addr;
	dma_addr_t data_dma_addr;

	cx25821_free_memory_audio(dev);

	dev->_risc_virt_addr = pci_alloc_consistent(dev->pci,
			dev->audio_upstream_riscbuf_size, &dma_addr);
	dev->_risc_virt_start_addr = dev->_risc_virt_addr;
	dev->_risc_phys_start_addr = dma_addr;
	dev->_risc_phys_addr = dma_addr;
	dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;

	if (!dev->_risc_virt_addr) {
		printk(KERN_DEBUG
			pr_fmt("ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning\n"));
		return -ENOMEM;
	}
	/* Clear out memory at address */
	memset(dev->_risc_virt_addr, 0, dev->_audiorisc_size);

	/* For Audio Data buffer allocation */
	dev->_audiodata_buf_virt_addr = pci_alloc_consistent(dev->pci,
			dev->audio_upstream_databuf_size, &data_dma_addr);
	dev->_audiodata_buf_phys_addr = data_dma_addr;
	dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;

	if (!dev->_audiodata_buf_virt_addr) {
		printk(KERN_DEBUG
			pr_fmt("ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning\n"));
		return -ENOMEM;
	}
	/* Clear out memory at address */
	memset(dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size);

	ret = cx25821_openfile_audio(dev, sram_ch);
	if (ret < 0)
		return ret;

	/* Creating RISC programs */
	ret = cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl,
						dev->_audio_lines_count);
	if (ret < 0) {
		printk(KERN_DEBUG
			pr_fmt("ERROR creating audio upstream RISC programs!\n"));
		goto error;
	}

	return 0;

error:
	return ret;
}

static int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num,
			       u32 status)
{
	int i = 0;
	u32 int_msk_tmp;
	const struct sram_channel *channel = dev->channels[chan_num].sram_channels;
	dma_addr_t risc_phys_jump_addr;
	__le32 *rp;

	if (status & FLD_AUD_SRC_RISCI1) {
		/* Get interrupt_index of the program that interrupted */
		u32 prog_cnt = cx_read(channel->gpcnt);

		/* Since we've identified our IRQ, clear our bits from the
		 * interrupt mask and interrupt status registers */
		cx_write(channel->int_msk, 0);
		cx_write(channel->int_stat, cx_read(channel->int_stat));

		spin_lock(&dev->slock);

		while (prog_cnt != dev->_last_index_irq) {
			/* Update _last_index_irq */
			if (dev->_last_index_irq < (NUMBER_OF_PROGRAMS - 1))
				dev->_last_index_irq++;
			else
				dev->_last_index_irq = 0;

			dev->_audioframe_index = dev->_last_index_irq;

			queue_work(dev->_irq_audio_queues,
				   &dev->_audio_work_entry);
		}

		if (dev->_is_first_audio_frame) {
			dev->_is_first_audio_frame = 0;

			if (dev->_risc_virt_start_addr != NULL) {
				risc_phys_jump_addr =
					dev->_risc_phys_start_addr +
					RISC_SYNC_INSTRUCTION_SIZE +
					AUDIO_RISC_DMA_BUF_SIZE;

				rp = cx25821_risc_field_upstream_audio(dev,
						dev->_risc_virt_start_addr + 1,
						dev->_audiodata_buf_phys_addr,
						AUDIO_LINE_SIZE, FIFO_DISABLE);

				if (USE_RISC_NOOP_AUDIO) {
					for (i = 0; i < NUM_NO_OPS; i++) {
						*(rp++) =
						    cpu_to_le32(RISC_NOOP);
					}
				}
				/* Jump to 2nd Audio Frame */
				*(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 |
						RISC_CNT_RESET);
				*(rp++) = cpu_to_le32(risc_phys_jump_addr);
				*(rp++) = cpu_to_le32(0);
			}
		}

		spin_unlock(&dev->slock);
	} else {
		if (status & FLD_AUD_SRC_OF)
			pr_warn("%s(): Audio Received Overflow Error Interrupt!\n",
				__func__);

		if (status & FLD_AUD_SRC_SYNC)
			pr_warn("%s(): Audio Received Sync Error Interrupt!\n",
				__func__);

		if (status & FLD_AUD_SRC_OPC_ERR)
			pr_warn("%s(): Audio Received OpCode Error Interrupt!\n",
				__func__);

		/* Read and write back the interrupt status register to clear
		 * our bits */
		cx_write(channel->int_stat, cx_read(channel->int_stat));
	}

	if (dev->_audiofile_status == END_OF_FILE) {
		pr_warn("EOF Channel Audio Framecount = %d\n",
			dev->_audioframe_count);
		return -1;
	}
	/* ElSE, set the interrupt mask register, re-enable irq. */
	int_msk_tmp = cx_read(channel->int_msk);
	cx_write(channel->int_msk, int_msk_tmp |= _intr_msk);

	return 0;
}

static irqreturn_t cx25821_upstream_irq_audio(int irq, void *dev_id)
{
	struct cx25821_dev *dev = dev_id;
	u32 audio_status;
	int handled = 0;
	const struct sram_channel *sram_ch;

	if (!dev)
		return -1;

	sram_ch = dev->channels[dev->_audio_upstream_channel].sram_channels;

	audio_status = cx_read(sram_ch->int_stat);

	/* Only deal with our interrupt */
	if (audio_status) {
		handled = cx25821_audio_upstream_irq(dev,
				dev->_audio_upstream_channel, audio_status);
	}

	if (handled < 0)
		cx25821_stop_upstream_audio(dev);
	else
		handled += handled;

	return IRQ_RETVAL(handled);
}

static void cx25821_wait_fifo_enable(struct cx25821_dev *dev,
				     const struct sram_channel *sram_ch)
{
	int count = 0;
	u32 tmp;

	do {
		/* Wait 10 microsecond before checking to see if the FIFO is
		 * turned ON. */
		udelay(10);

		tmp = cx_read(sram_ch->dma_ctl);

		/* 10 millisecond timeout */
		if (count++ > 1000) {
			pr_err("ERROR: %s() fifo is NOT turned on. Timeout!\n",
				__func__);
			return;
		}

	} while (!(tmp & sram_ch->fld_aud_fifo_en));

}

static int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
					    const struct sram_channel *sram_ch)
{
	u32 tmp = 0;
	int err = 0;

	/* Set the physical start address of the RISC program in the initial
	 * program counter(IPC) member of the CMDS. */
	cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
	/* Risc IPC High 64 bits 63-32 */
	cx_write(sram_ch->cmds_start + 4, 0);

	/* reset counter */
	cx_write(sram_ch->gpcnt_ctl, 3);

	/* Set the line length       (It looks like we do not need to set the
	 * line length) */
	cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);

	/* Set the input mode to 16-bit */
	tmp = cx_read(sram_ch->aud_cfg);
	tmp |= FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
		FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D |
		FLD_AUD_SONY_MODE;
	cx_write(sram_ch->aud_cfg, tmp);

	/* Read and write back the interrupt status register to clear it */
	tmp = cx_read(sram_ch->int_stat);
	cx_write(sram_ch->int_stat, tmp);

	/* Clear our bits from the interrupt status register. */
	cx_write(sram_ch->int_stat, _intr_msk);

	/* Set the interrupt mask register, enable irq. */
	cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
	tmp = cx_read(sram_ch->int_msk);
	cx_write(sram_ch->int_msk, tmp |= _intr_msk);

	err = request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
			IRQF_SHARED, dev->name, dev);
	if (err < 0) {
		pr_err("%s: can't get upstream IRQ %d\n", dev->name,
				dev->pci->irq);
		goto fail_irq;
	}

	/* Start the DMA  engine */
	tmp = cx_read(sram_ch->dma_ctl);
	cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);

	dev->_audio_is_running = 1;
	dev->_is_first_audio_frame = 1;

	/* The fifo_en bit turns on by the first Risc program */
	cx25821_wait_fifo_enable(dev, sram_ch);

	return 0;

fail_irq:
	cx25821_dev_unregister(dev);
	return err;
}

int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
{
	const struct sram_channel *sram_ch;
	int err = 0;

	if (dev->_audio_is_running) {
		pr_warn("Audio Channel is still running so return!\n");
		return 0;
	}

	dev->_audio_upstream_channel = channel_select;
	sram_ch = dev->channels[channel_select].sram_channels;

	/* Work queue */
	INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
	dev->_irq_audio_queues =
	    create_singlethread_workqueue("cx25821_audioworkqueue");

	if (!dev->_irq_audio_queues) {
		printk(KERN_DEBUG
			pr_fmt("ERROR: create_singlethread_workqueue() for Audio FAILED!\n"));
		return -ENOMEM;
	}

	dev->_last_index_irq = 0;
	dev->_audio_is_running = 0;
	dev->_audioframe_count = 0;
	dev->_audiofile_status = RESET_STATUS;
	dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
	_line_size = AUDIO_LINE_SIZE;

	if ((dev->input_audiofilename) &&
	    (strcmp(dev->input_audiofilename, "") != 0))
		dev->_audiofilename = kstrdup(dev->input_audiofilename,
					      GFP_KERNEL);
	else
		dev->_audiofilename = kstrdup(_defaultAudioName,
					      GFP_KERNEL);

	if (!dev->_audiofilename) {
		err = -ENOMEM;
		goto error;
	}

	cx25821_sram_channel_setup_upstream_audio(dev, sram_ch,
						  _line_size, 0);

	dev->audio_upstream_riscbuf_size =
		AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
		RISC_SYNC_INSTRUCTION_SIZE;
	dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;

	/* Allocating buffers and prepare RISC program */
	err = cx25821_audio_upstream_buffer_prepare(dev, sram_ch,
							_line_size);
	if (err < 0) {
		pr_err("%s: Failed to set up Audio upstream buffers!\n",
			dev->name);
		goto error;
	}
	/* Start RISC engine */
	cx25821_start_audio_dma_upstream(dev, sram_ch);

	return 0;

error:
	cx25821_dev_unregister(dev);

	return err;
}