summaryrefslogtreecommitdiff
path: root/sound/firewire/fireface/amdtp-ff.c
blob: 780da9deb2f01b75b6b6fe4c29d352a134f2103d (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
/*
 * amdtp-ff.c - a part of driver for RME Fireface series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include <sound/pcm.h>
#include "ff.h"

struct amdtp_ff {
	unsigned int pcm_channels;
};

int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate,
			    unsigned int pcm_channels)
{
	struct amdtp_ff *p = s->protocol;
	unsigned int data_channels;

	if (amdtp_stream_running(s))
		return -EBUSY;

	p->pcm_channels = pcm_channels;
	data_channels = pcm_channels;

	return amdtp_stream_set_parameters(s, rate, data_channels);
}

static void write_pcm_s32(struct amdtp_stream *s,
			  struct snd_pcm_substream *pcm,
			  __le32 *buffer, unsigned int frames)
{
	struct amdtp_ff *p = s->protocol;
	struct snd_pcm_runtime *runtime = pcm->runtime;
	unsigned int channels, remaining_frames, i, c;
	const u32 *src;

	channels = p->pcm_channels;
	src = (void *)runtime->dma_area +
			frames_to_bytes(runtime, s->pcm_buffer_pointer);
	remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;

	for (i = 0; i < frames; ++i) {
		for (c = 0; c < channels; ++c) {
			buffer[c] = cpu_to_le32(*src);
			src++;
		}
		buffer += s->data_block_quadlets;
		if (--remaining_frames == 0)
			src = (void *)runtime->dma_area;
	}
}

static void read_pcm_s32(struct amdtp_stream *s,
			 struct snd_pcm_substream *pcm,
			 __le32 *buffer, unsigned int frames)
{
	struct amdtp_ff *p = s->protocol;
	struct snd_pcm_runtime *runtime = pcm->runtime;
	unsigned int channels, remaining_frames, i, c;
	u32 *dst;

	channels = p->pcm_channels;
	dst  = (void *)runtime->dma_area +
			frames_to_bytes(runtime, s->pcm_buffer_pointer);
	remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;

	for (i = 0; i < frames; ++i) {
		for (c = 0; c < channels; ++c) {
			*dst = le32_to_cpu(buffer[c]) & 0xffffff00;
			dst++;
		}
		buffer += s->data_block_quadlets;
		if (--remaining_frames == 0)
			dst = (void *)runtime->dma_area;
	}
}

static void write_pcm_silence(struct amdtp_stream *s,
			      __le32 *buffer, unsigned int frames)
{
	struct amdtp_ff *p = s->protocol;
	unsigned int i, c, channels = p->pcm_channels;

	for (i = 0; i < frames; ++i) {
		for (c = 0; c < channels; ++c)
			buffer[c] = cpu_to_le32(0x00000000);
		buffer += s->data_block_quadlets;
	}
}

int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
				    struct snd_pcm_runtime *runtime)
{
	int err;

	err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
	if (err < 0)
		return err;

	return amdtp_stream_add_pcm_hw_constraints(s, runtime);
}

static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
					   __be32 *buffer,
					   unsigned int data_blocks,
					   unsigned int *syt)
{
	struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm);
	unsigned int pcm_frames;

	if (pcm) {
		write_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks);
		pcm_frames = data_blocks;
	} else {
		write_pcm_silence(s, (__le32 *)buffer, data_blocks);
		pcm_frames = 0;
	}

	return pcm_frames;
}

static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
					   __be32 *buffer,
					   unsigned int data_blocks,
					   unsigned int *syt)
{
	struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm);
	unsigned int pcm_frames;

	if (pcm) {
		read_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks);
		pcm_frames = data_blocks;
	} else {
		pcm_frames = 0;
	}

	return pcm_frames;
}

int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
		  enum amdtp_stream_direction dir)
{
	amdtp_stream_process_data_blocks_t process_data_blocks;

	if (dir == AMDTP_IN_STREAM)
		process_data_blocks = process_tx_data_blocks;
	else
		process_data_blocks = process_rx_data_blocks;

	return amdtp_stream_init(s, unit, dir, CIP_NO_HEADER, 0,
				 process_data_blocks, sizeof(struct amdtp_ff));
}