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// SPDX-License-Identifier: GPL-2.0-only
/*
* amdtp-ff.c - a part of driver for RME Fireface series
*
* Copyright (c) 2015-2017 Takashi Sakamoto
*/
#include <sound/pcm.h>
#include "ff.h"
struct amdtp_ff {
unsigned int pcm_channels;
};
int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate,
unsigned int pcm_channels)
{
struct amdtp_ff *p = s->protocol;
unsigned int data_channels;
if (amdtp_stream_running(s))
return -EBUSY;
p->pcm_channels = pcm_channels;
data_channels = pcm_channels;
return amdtp_stream_set_parameters(s, rate, data_channels);
}
static void write_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
__le32 *buffer, unsigned int frames,
unsigned int pcm_frames)
{
struct amdtp_ff *p = s->protocol;
unsigned int channels = p->pcm_channels;
struct snd_pcm_runtime *runtime = pcm->runtime;
unsigned int pcm_buffer_pointer;
int remaining_frames;
const u32 *src;
int i, c;
pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
pcm_buffer_pointer %= runtime->buffer_size;
src = (void *)runtime->dma_area +
frames_to_bytes(runtime, pcm_buffer_pointer);
remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
buffer[c] = cpu_to_le32(*src);
src++;
}
buffer += s->data_block_quadlets;
if (--remaining_frames == 0)
src = (void *)runtime->dma_area;
}
}
static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
__le32 *buffer, unsigned int frames,
unsigned int pcm_frames)
{
struct amdtp_ff *p = s->protocol;
unsigned int channels = p->pcm_channels;
struct snd_pcm_runtime *runtime = pcm->runtime;
unsigned int pcm_buffer_pointer;
int remaining_frames;
u32 *dst;
int i, c;
pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
pcm_buffer_pointer %= runtime->buffer_size;
dst = (void *)runtime->dma_area +
frames_to_bytes(runtime, pcm_buffer_pointer);
remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
*dst = le32_to_cpu(buffer[c]) & 0xffffff00;
dst++;
}
buffer += s->data_block_quadlets;
if (--remaining_frames == 0)
dst = (void *)runtime->dma_area;
}
}
static void write_pcm_silence(struct amdtp_stream *s,
__le32 *buffer, unsigned int frames)
{
struct amdtp_ff *p = s->protocol;
unsigned int i, c, channels = p->pcm_channels;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c)
buffer[c] = cpu_to_le32(0x00000000);
buffer += s->data_block_quadlets;
}
}
int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
struct snd_pcm_runtime *runtime)
{
int err;
err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
if (err < 0)
return err;
return amdtp_stream_add_pcm_hw_constraints(s, runtime);
}
static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
const struct pkt_desc *descs,
unsigned int packets,
struct snd_pcm_substream *pcm)
{
unsigned int pcm_frames = 0;
int i;
for (i = 0; i < packets; ++i) {
const struct pkt_desc *desc = descs + i;
__le32 *buf = (__le32 *)desc->ctx_payload;
unsigned int data_blocks = desc->data_blocks;
if (pcm) {
write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
pcm_frames += data_blocks;
} else {
write_pcm_silence(s, buf, data_blocks);
}
}
return pcm_frames;
}
static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
const struct pkt_desc *descs,
unsigned int packets,
struct snd_pcm_substream *pcm)
{
unsigned int pcm_frames = 0;
int i;
for (i = 0; i < packets; ++i) {
const struct pkt_desc *desc = descs + i;
__le32 *buf = (__le32 *)desc->ctx_payload;
unsigned int data_blocks = desc->data_blocks;
if (pcm) {
read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
pcm_frames += data_blocks;
}
}
return pcm_frames;
}
int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
enum amdtp_stream_direction dir)
{
amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
if (dir == AMDTP_IN_STREAM)
process_ctx_payloads = process_ir_ctx_payloads;
else
process_ctx_payloads = process_it_ctx_payloads;
return amdtp_stream_init(s, unit, dir, CIP_NO_HEADER, 0,
process_ctx_payloads, sizeof(struct amdtp_ff));
}
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