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