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8#include <sound/pcm.h>
9#include "ff.h"
10
11struct amdtp_ff {
12 unsigned int pcm_channels;
13};
14
15int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate,
16 unsigned int pcm_channels)
17{
18 struct amdtp_ff *p = s->protocol;
19 unsigned int data_channels;
20
21 if (amdtp_stream_running(s))
22 return -EBUSY;
23
24 p->pcm_channels = pcm_channels;
25 data_channels = pcm_channels;
26
27 return amdtp_stream_set_parameters(s, rate, data_channels);
28}
29
30static void write_pcm_s32(struct amdtp_stream *s,
31 struct snd_pcm_substream *pcm,
32 __le32 *buffer, unsigned int frames)
33{
34 struct amdtp_ff *p = s->protocol;
35 struct snd_pcm_runtime *runtime = pcm->runtime;
36 unsigned int channels, remaining_frames, i, c;
37 const u32 *src;
38
39 channels = p->pcm_channels;
40 src = (void *)runtime->dma_area +
41 frames_to_bytes(runtime, s->pcm_buffer_pointer);
42 remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
43
44 for (i = 0; i < frames; ++i) {
45 for (c = 0; c < channels; ++c) {
46 buffer[c] = cpu_to_le32(*src);
47 src++;
48 }
49 buffer += s->data_block_quadlets;
50 if (--remaining_frames == 0)
51 src = (void *)runtime->dma_area;
52 }
53}
54
55static void read_pcm_s32(struct amdtp_stream *s,
56 struct snd_pcm_substream *pcm,
57 __le32 *buffer, unsigned int frames)
58{
59 struct amdtp_ff *p = s->protocol;
60 struct snd_pcm_runtime *runtime = pcm->runtime;
61 unsigned int channels, remaining_frames, i, c;
62 u32 *dst;
63
64 channels = p->pcm_channels;
65 dst = (void *)runtime->dma_area +
66 frames_to_bytes(runtime, s->pcm_buffer_pointer);
67 remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
68
69 for (i = 0; i < frames; ++i) {
70 for (c = 0; c < channels; ++c) {
71 *dst = le32_to_cpu(buffer[c]) & 0xffffff00;
72 dst++;
73 }
74 buffer += s->data_block_quadlets;
75 if (--remaining_frames == 0)
76 dst = (void *)runtime->dma_area;
77 }
78}
79
80static void write_pcm_silence(struct amdtp_stream *s,
81 __le32 *buffer, unsigned int frames)
82{
83 struct amdtp_ff *p = s->protocol;
84 unsigned int i, c, channels = p->pcm_channels;
85
86 for (i = 0; i < frames; ++i) {
87 for (c = 0; c < channels; ++c)
88 buffer[c] = cpu_to_le32(0x00000000);
89 buffer += s->data_block_quadlets;
90 }
91}
92
93int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
94 struct snd_pcm_runtime *runtime)
95{
96 int err;
97
98 err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
99 if (err < 0)
100 return err;
101
102 return amdtp_stream_add_pcm_hw_constraints(s, runtime);
103}
104
105static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
106 __be32 *buffer,
107 unsigned int data_blocks,
108 unsigned int *syt)
109{
110 struct snd_pcm_substream *pcm = READ_ONCE(s->pcm);
111 unsigned int pcm_frames;
112
113 if (pcm) {
114 write_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks);
115 pcm_frames = data_blocks;
116 } else {
117 write_pcm_silence(s, (__le32 *)buffer, data_blocks);
118 pcm_frames = 0;
119 }
120
121 return pcm_frames;
122}
123
124static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
125 __be32 *buffer,
126 unsigned int data_blocks,
127 unsigned int *syt)
128{
129 struct snd_pcm_substream *pcm = READ_ONCE(s->pcm);
130 unsigned int pcm_frames;
131
132 if (pcm) {
133 read_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks);
134 pcm_frames = data_blocks;
135 } else {
136 pcm_frames = 0;
137 }
138
139 return pcm_frames;
140}
141
142int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
143 enum amdtp_stream_direction dir)
144{
145 amdtp_stream_process_data_blocks_t process_data_blocks;
146
147 if (dir == AMDTP_IN_STREAM)
148 process_data_blocks = process_tx_data_blocks;
149 else
150 process_data_blocks = process_rx_data_blocks;
151
152 return amdtp_stream_init(s, unit, dir, CIP_NO_HEADER, 0,
153 process_data_blocks, sizeof(struct amdtp_ff));
154}
155
