1 // SPDX-License-Identifier: GPL-2.0-only
3 * amdtp-ff.c - a part of driver for RME Fireface series
5 * Copyright (c) 2015-2017 Takashi Sakamoto
12 unsigned int pcm_channels;
15 int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate,
16 unsigned int pcm_channels)
18 struct amdtp_ff *p = s->protocol;
19 unsigned int data_channels;
21 if (amdtp_stream_running(s))
24 p->pcm_channels = pcm_channels;
25 data_channels = pcm_channels;
27 return amdtp_stream_set_parameters(s, rate, data_channels, 1);
30 static void write_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
31 __le32 *buffer, unsigned int frames,
32 unsigned int pcm_frames)
34 struct amdtp_ff *p = s->protocol;
35 unsigned int channels = p->pcm_channels;
36 struct snd_pcm_runtime *runtime = pcm->runtime;
37 unsigned int pcm_buffer_pointer;
42 pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
43 pcm_buffer_pointer %= runtime->buffer_size;
45 src = (void *)runtime->dma_area +
46 frames_to_bytes(runtime, pcm_buffer_pointer);
47 remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
49 for (i = 0; i < frames; ++i) {
50 for (c = 0; c < channels; ++c) {
51 buffer[c] = cpu_to_le32(*src);
54 buffer += s->data_block_quadlets;
55 if (--remaining_frames == 0)
56 src = (void *)runtime->dma_area;
60 static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
61 __le32 *buffer, unsigned int frames,
62 unsigned int pcm_frames)
64 struct amdtp_ff *p = s->protocol;
65 unsigned int channels = p->pcm_channels;
66 struct snd_pcm_runtime *runtime = pcm->runtime;
67 unsigned int pcm_buffer_pointer;
72 pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
73 pcm_buffer_pointer %= runtime->buffer_size;
75 dst = (void *)runtime->dma_area +
76 frames_to_bytes(runtime, pcm_buffer_pointer);
77 remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
79 for (i = 0; i < frames; ++i) {
80 for (c = 0; c < channels; ++c) {
81 *dst = le32_to_cpu(buffer[c]) & 0xffffff00;
84 buffer += s->data_block_quadlets;
85 if (--remaining_frames == 0)
86 dst = (void *)runtime->dma_area;
90 static void write_pcm_silence(struct amdtp_stream *s,
91 __le32 *buffer, unsigned int frames)
93 struct amdtp_ff *p = s->protocol;
94 unsigned int i, c, channels = p->pcm_channels;
96 for (i = 0; i < frames; ++i) {
97 for (c = 0; c < channels; ++c)
98 buffer[c] = cpu_to_le32(0x00000000);
99 buffer += s->data_block_quadlets;
103 int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
104 struct snd_pcm_runtime *runtime)
108 err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
112 return amdtp_stream_add_pcm_hw_constraints(s, runtime);
115 static void process_it_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
116 unsigned int count, struct snd_pcm_substream *pcm)
118 unsigned int pcm_frames = 0;
121 for (i = 0; i < count; ++i) {
122 __le32 *buf = (__le32 *)desc->ctx_payload;
123 unsigned int data_blocks = desc->data_blocks;
126 write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
127 pcm_frames += data_blocks;
129 write_pcm_silence(s, buf, data_blocks);
132 desc = amdtp_stream_next_packet_desc(s, desc);
136 static void process_ir_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
137 unsigned int count, struct snd_pcm_substream *pcm)
139 unsigned int pcm_frames = 0;
142 for (i = 0; i < count; ++i) {
143 __le32 *buf = (__le32 *)desc->ctx_payload;
144 unsigned int data_blocks = desc->data_blocks;
147 read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
148 pcm_frames += data_blocks;
151 desc = amdtp_stream_next_packet_desc(s, desc);
155 int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
156 enum amdtp_stream_direction dir)
158 amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
160 if (dir == AMDTP_IN_STREAM)
161 process_ctx_payloads = process_ir_ctx_payloads;
163 process_ctx_payloads = process_it_ctx_payloads;
165 return amdtp_stream_init(s, unit, dir, CIP_BLOCKING | CIP_UNAWARE_SYT | CIP_NO_HEADER, 0,
166 process_ctx_payloads, sizeof(struct amdtp_ff));