amdtp-ff.c

  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_channels, 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, 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, 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, 0, 32, 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, buf, data_blocks, pcm_frames);
127			pcm_frames += data_blocks;
128		} else {
129			write_pcm_silence(s, buf, 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, buf, 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, CIP_BLOCKING | CIP_UNAWARE_SYT | CIP_NO_HEADER, 0,
166				 process_ctx_payloads, sizeof(struct amdtp_ff));
167}