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47faeea2 TS |
1 | /* |
2 | * amdtp-tascam.c - a part of driver for TASCAM FireWire series | |
3 | * | |
4 | * Copyright (c) 2015 Takashi Sakamoto | |
5 | * | |
6 | * Licensed under the terms of the GNU General Public License, version 2. | |
7 | */ | |
8 | ||
9 | #include <sound/pcm.h> | |
10 | #include "tascam.h" | |
11 | ||
12 | #define AMDTP_FMT_TSCM_TX 0x1e | |
13 | #define AMDTP_FMT_TSCM_RX 0x3e | |
14 | ||
15 | struct amdtp_tscm { | |
16 | unsigned int pcm_channels; | |
47faeea2 TS |
17 | }; |
18 | ||
19 | int amdtp_tscm_set_parameters(struct amdtp_stream *s, unsigned int rate) | |
20 | { | |
21 | struct amdtp_tscm *p = s->protocol; | |
22 | unsigned int data_channels; | |
23 | ||
24 | if (amdtp_stream_running(s)) | |
25 | return -EBUSY; | |
26 | ||
27 | data_channels = p->pcm_channels; | |
28 | ||
29 | /* Packets in in-stream have extra 2 data channels. */ | |
30 | if (s->direction == AMDTP_IN_STREAM) | |
31 | data_channels += 2; | |
32 | ||
33 | return amdtp_stream_set_parameters(s, rate, data_channels); | |
34 | } | |
35 | ||
36 | static void write_pcm_s32(struct amdtp_stream *s, | |
37 | struct snd_pcm_substream *pcm, | |
38 | __be32 *buffer, unsigned int frames) | |
39 | { | |
40 | struct amdtp_tscm *p = s->protocol; | |
41 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
42 | unsigned int channels, remaining_frames, i, c; | |
43 | const u32 *src; | |
44 | ||
45 | channels = p->pcm_channels; | |
46 | src = (void *)runtime->dma_area + | |
47 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
48 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
49 | ||
50 | for (i = 0; i < frames; ++i) { | |
51 | for (c = 0; c < channels; ++c) { | |
52 | buffer[c] = cpu_to_be32(*src); | |
53 | src++; | |
54 | } | |
55 | buffer += s->data_block_quadlets; | |
56 | if (--remaining_frames == 0) | |
57 | src = (void *)runtime->dma_area; | |
58 | } | |
59 | } | |
60 | ||
47faeea2 TS |
61 | static void read_pcm_s32(struct amdtp_stream *s, |
62 | struct snd_pcm_substream *pcm, | |
63 | __be32 *buffer, unsigned int frames) | |
64 | { | |
65 | struct amdtp_tscm *p = s->protocol; | |
66 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
67 | unsigned int channels, remaining_frames, i, c; | |
68 | u32 *dst; | |
69 | ||
70 | channels = p->pcm_channels; | |
71 | dst = (void *)runtime->dma_area + | |
72 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
73 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
74 | ||
75 | /* The first data channel is for event counter. */ | |
76 | buffer += 1; | |
77 | ||
78 | for (i = 0; i < frames; ++i) { | |
79 | for (c = 0; c < channels; ++c) { | |
80 | *dst = be32_to_cpu(buffer[c]); | |
81 | dst++; | |
82 | } | |
83 | buffer += s->data_block_quadlets; | |
84 | if (--remaining_frames == 0) | |
85 | dst = (void *)runtime->dma_area; | |
86 | } | |
87 | } | |
88 | ||
89 | static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer, | |
90 | unsigned int data_blocks) | |
91 | { | |
92 | struct amdtp_tscm *p = s->protocol; | |
93 | unsigned int channels, i, c; | |
94 | ||
95 | channels = p->pcm_channels; | |
96 | ||
97 | for (i = 0; i < data_blocks; ++i) { | |
98 | for (c = 0; c < channels; ++c) | |
99 | buffer[c] = 0x00000000; | |
100 | buffer += s->data_block_quadlets; | |
101 | } | |
102 | } | |
103 | ||
104 | int amdtp_tscm_add_pcm_hw_constraints(struct amdtp_stream *s, | |
105 | struct snd_pcm_runtime *runtime) | |
106 | { | |
107 | int err; | |
108 | ||
109 | /* | |
110 | * Our implementation allows this protocol to deliver 24 bit sample in | |
111 | * 32bit data channel. | |
112 | */ | |
113 | err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); | |
114 | if (err < 0) | |
115 | return err; | |
116 | ||
117 | return amdtp_stream_add_pcm_hw_constraints(s, runtime); | |
118 | } | |
119 | ||
47faeea2 TS |
120 | static unsigned int process_tx_data_blocks(struct amdtp_stream *s, |
121 | __be32 *buffer, | |
122 | unsigned int data_blocks, | |
123 | unsigned int *syt) | |
124 | { | |
47faeea2 TS |
125 | struct snd_pcm_substream *pcm; |
126 | ||
6aa7de05 | 127 | pcm = READ_ONCE(s->pcm); |
47faeea2 | 128 | if (data_blocks > 0 && pcm) |
a02cb8f8 | 129 | read_pcm_s32(s, pcm, buffer, data_blocks); |
47faeea2 TS |
130 | |
131 | /* A place holder for control messages. */ | |
132 | ||
133 | return data_blocks; | |
134 | } | |
135 | ||
136 | static unsigned int process_rx_data_blocks(struct amdtp_stream *s, | |
137 | __be32 *buffer, | |
138 | unsigned int data_blocks, | |
139 | unsigned int *syt) | |
140 | { | |
47faeea2 TS |
141 | struct snd_pcm_substream *pcm; |
142 | ||
143 | /* This field is not used. */ | |
144 | *syt = 0x0000; | |
145 | ||
6aa7de05 | 146 | pcm = READ_ONCE(s->pcm); |
47faeea2 | 147 | if (pcm) |
a02cb8f8 | 148 | write_pcm_s32(s, pcm, buffer, data_blocks); |
47faeea2 TS |
149 | else |
150 | write_pcm_silence(s, buffer, data_blocks); | |
151 | ||
152 | return data_blocks; | |
153 | } | |
154 | ||
155 | int amdtp_tscm_init(struct amdtp_stream *s, struct fw_unit *unit, | |
156 | enum amdtp_stream_direction dir, unsigned int pcm_channels) | |
157 | { | |
158 | amdtp_stream_process_data_blocks_t process_data_blocks; | |
159 | struct amdtp_tscm *p; | |
160 | unsigned int fmt; | |
161 | int err; | |
162 | ||
163 | if (dir == AMDTP_IN_STREAM) { | |
164 | fmt = AMDTP_FMT_TSCM_TX; | |
165 | process_data_blocks = process_tx_data_blocks; | |
166 | } else { | |
167 | fmt = AMDTP_FMT_TSCM_RX; | |
168 | process_data_blocks = process_rx_data_blocks; | |
169 | } | |
170 | ||
171 | err = amdtp_stream_init(s, unit, dir, | |
172 | CIP_NONBLOCKING | CIP_SKIP_DBC_ZERO_CHECK, fmt, | |
173 | process_data_blocks, sizeof(struct amdtp_tscm)); | |
174 | if (err < 0) | |
175 | return 0; | |
176 | ||
177 | /* Use fixed value for FDF field. */ | |
178 | s->fdf = 0x00; | |
179 | ||
180 | /* This protocol uses fixed number of data channels for PCM samples. */ | |
181 | p = s->protocol; | |
182 | p->pcm_channels = pcm_channels; | |
183 | ||
184 | return 0; | |
185 | } |