1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * amdtp-ff.c - a part of driver for RME Fireface series
4 *
5 * Copyright (c) 2015-2017 Takashi Sakamoto
6 */
7
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_block_quadlets: data_channels, pcm_frame_multiplier: 1);
28}
29
30static void write_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
31 __le32 *buffer, unsigned int frames,
32 unsigned int pcm_frames)
33{
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;
38 int remaining_frames;
39 const u32 *src;
40 int i, c;
41
42 pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
43 pcm_buffer_pointer %= runtime->buffer_size;
44
45 src = (void *)runtime->dma_area +
46 frames_to_bytes(runtime, size: pcm_buffer_pointer);
47 remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
48
49 for (i = 0; i < frames; ++i) {
50 for (c = 0; c < channels; ++c) {
51 buffer[c] = cpu_to_le32(*src);
52 src++;
53 }
54 buffer += s->data_block_quadlets;
55 if (--remaining_frames == 0)
56 src = (void *)runtime->dma_area;
57 }
58}
59
60static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
61 __le32 *buffer, unsigned int frames,
62 unsigned int pcm_frames)
63{
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;
68 int remaining_frames;
69 u32 *dst;
70 int i, c;
71
72 pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
73 pcm_buffer_pointer %= runtime->buffer_size;
74
75 dst = (void *)runtime->dma_area +
76 frames_to_bytes(runtime, size: pcm_buffer_pointer);
77 remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
78
79 for (i = 0; i < frames; ++i) {
80 for (c = 0; c < channels; ++c) {
81 *dst = le32_to_cpu(buffer[c]) & 0xffffff00;
82 dst++;
83 }
84 buffer += s->data_block_quadlets;
85 if (--remaining_frames == 0)
86 dst = (void *)runtime->dma_area;
87 }
88}
89
90static void write_pcm_silence(struct amdtp_stream *s,
91 __le32 *buffer, unsigned int frames)
92{
93 struct amdtp_ff *p = s->protocol;
94 unsigned int i, c, channels = p->pcm_channels;
95
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;
100 }
101}
102
103int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
104 struct snd_pcm_runtime *runtime)
105{
106 int err;
107
108 err = snd_pcm_hw_constraint_msbits(runtime, cond: 0, width: 32, msbits: 24);
109 if (err < 0)
110 return err;
111
112 return amdtp_stream_add_pcm_hw_constraints(s, runtime);
113}
114
115static void process_it_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
116 unsigned int count, struct snd_pcm_substream *pcm)
117{
118 unsigned int pcm_frames = 0;
119 int i;
120
121 for (i = 0; i < count; ++i) {
122 __le32 *buf = (__le32 *)desc->ctx_payload;
123 unsigned int data_blocks = desc->data_blocks;
124
125 if (pcm) {
126 write_pcm_s32(s, pcm, buffer: buf, frames: data_blocks, pcm_frames);
127 pcm_frames += data_blocks;
128 } else {
129 write_pcm_silence(s, buffer: buf, frames: data_blocks);
130 }
131
132 desc = amdtp_stream_next_packet_desc(s, desc);
133 }
134}
135
136static void process_ir_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
137 unsigned int count, struct snd_pcm_substream *pcm)
138{
139 unsigned int pcm_frames = 0;
140 int i;
141
142 for (i = 0; i < count; ++i) {
143 __le32 *buf = (__le32 *)desc->ctx_payload;
144 unsigned int data_blocks = desc->data_blocks;
145
146 if (pcm) {
147 read_pcm_s32(s, pcm, buffer: buf, frames: data_blocks, pcm_frames);
148 pcm_frames += data_blocks;
149 }
150
151 desc = amdtp_stream_next_packet_desc(s, desc);
152 }
153}
154
155int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
156 enum amdtp_stream_direction dir)
157{
158 amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
159
160 if (dir == AMDTP_IN_STREAM)
161 process_ctx_payloads = process_ir_ctx_payloads;
162 else
163 process_ctx_payloads = process_it_ctx_payloads;
164
165 return amdtp_stream_init(s, unit, dir, flags: CIP_BLOCKING | CIP_UNAWARE_SYT | CIP_NO_HEADER, fmt: 0,
166 process_ctx_payloads, protocol_size: sizeof(struct amdtp_ff));
167}
168

source code of linux/sound/firewire/fireface/amdtp-ff.c