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9#include <sound/pcm.h>
10#include "ff.h"
11
12struct amdtp_ff {
13 unsigned int pcm_channels;
14};
15
16int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate,
17 unsigned int pcm_channels)
18{
19 struct amdtp_ff *p = s->protocol;
20 unsigned int data_channels;
21
22 if (amdtp_stream_running(s))
23 return -EBUSY;
24
25 p->pcm_channels = pcm_channels;
26 data_channels = pcm_channels;
27
28 return amdtp_stream_set_parameters(s, rate, data_channels);
29}
30
31static void write_pcm_s32(struct amdtp_stream *s,
32 struct snd_pcm_substream *pcm,
33 __le32 *buffer, unsigned int frames)
34{
35 struct amdtp_ff *p = s->protocol;
36 struct snd_pcm_runtime *runtime = pcm->runtime;
37 unsigned int channels, remaining_frames, i, c;
38 const u32 *src;
39
40 channels = p->pcm_channels;
41 src = (void *)runtime->dma_area +
42 frames_to_bytes(runtime, s->pcm_buffer_pointer);
43 remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
44
45 for (i = 0; i < frames; ++i) {
46 for (c = 0; c < channels; ++c) {
47 buffer[c] = cpu_to_le32(*src);
48 src++;
49 }
50 buffer += s->data_block_quadlets;
51 if (--remaining_frames == 0)
52 src = (void *)runtime->dma_area;
53 }
54}
55
56static void read_pcm_s32(struct amdtp_stream *s,
57 struct snd_pcm_substream *pcm,
58 __le32 *buffer, unsigned int frames)
59{
60 struct amdtp_ff *p = s->protocol;
61 struct snd_pcm_runtime *runtime = pcm->runtime;
62 unsigned int channels, remaining_frames, i, c;
63 u32 *dst;
64
65 channels = p->pcm_channels;
66 dst = (void *)runtime->dma_area +
67 frames_to_bytes(runtime, s->pcm_buffer_pointer);
68 remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
69
70 for (i = 0; i < frames; ++i) {
71 for (c = 0; c < channels; ++c) {
72 *dst = le32_to_cpu(buffer[c]) & 0xffffff00;
73 dst++;
74 }
75 buffer += s->data_block_quadlets;
76 if (--remaining_frames == 0)
77 dst = (void *)runtime->dma_area;
78 }
79}
80
81static void write_pcm_silence(struct amdtp_stream *s,
82 __le32 *buffer, unsigned int frames)
83{
84 struct amdtp_ff *p = s->protocol;
85 unsigned int i, c, channels = p->pcm_channels;
86
87 for (i = 0; i < frames; ++i) {
88 for (c = 0; c < channels; ++c)
89 buffer[c] = cpu_to_le32(0x00000000);
90 buffer += s->data_block_quadlets;
91 }
92}
93
94int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
95 struct snd_pcm_runtime *runtime)
96{
97 int err;
98
99 err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
100 if (err < 0)
101 return err;
102
103 return amdtp_stream_add_pcm_hw_constraints(s, runtime);
104}
105
106static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
107 __be32 *buffer,
108 unsigned int data_blocks,
109 unsigned int *syt)
110{
111 struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm);
112 unsigned int pcm_frames;
113
114 if (pcm) {
115 write_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks);
116 pcm_frames = data_blocks;
117 } else {
118 write_pcm_silence(s, (__le32 *)buffer, data_blocks);
119 pcm_frames = 0;
120 }
121
122 return pcm_frames;
123}
124
125static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
126 __be32 *buffer,
127 unsigned int data_blocks,
128 unsigned int *syt)
129{
130 struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm);
131 unsigned int pcm_frames;
132
133 if (pcm) {
134 read_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks);
135 pcm_frames = data_blocks;
136 } else {
137 pcm_frames = 0;
138 }
139
140 return pcm_frames;
141}
142
143int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
144 enum amdtp_stream_direction dir)
145{
146 amdtp_stream_process_data_blocks_t process_data_blocks;
147
148 if (dir == AMDTP_IN_STREAM)
149 process_data_blocks = process_tx_data_blocks;
150 else
151 process_data_blocks = process_rx_data_blocks;
152
153 return amdtp_stream_init(s, unit, dir, CIP_NO_HEADER, 0,
154 process_data_blocks, sizeof(struct amdtp_ff));
155}
156
