1 /* 2 * amdtp-ff.c - a part of driver for RME Fireface series 3 * 4 * Copyright (c) 2015-2017 Takashi Sakamoto 5 * 6 * Licensed under the terms of the GNU General Public License, version 2. 7 */ 8 9 #include <sound/pcm.h> 10 #include "ff.h" 11 12 struct amdtp_ff { 13 unsigned int pcm_channels; 14 }; 15 16 int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate, 17 unsigned int pcm_channels) 18 { 19 struct amdtp_ff *p = s->protocol; 20 unsigned int data_channels; 21 22 if (amdtp_stream_running(s)) 23 return -EBUSY; 24 25 p->pcm_channels = pcm_channels; 26 data_channels = pcm_channels; 27 28 return amdtp_stream_set_parameters(s, rate, data_channels); 29 } 30 31 static void write_pcm_s32(struct amdtp_stream *s, 32 struct snd_pcm_substream *pcm, 33 __le32 *buffer, unsigned int frames) 34 { 35 struct amdtp_ff *p = s->protocol; 36 struct snd_pcm_runtime *runtime = pcm->runtime; 37 unsigned int channels, remaining_frames, i, c; 38 const u32 *src; 39 40 channels = p->pcm_channels; 41 src = (void *)runtime->dma_area + 42 frames_to_bytes(runtime, s->pcm_buffer_pointer); 43 remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; 44 45 for (i = 0; i < frames; ++i) { 46 for (c = 0; c < channels; ++c) { 47 buffer[c] = cpu_to_le32(*src); 48 src++; 49 } 50 buffer += s->data_block_quadlets; 51 if (--remaining_frames == 0) 52 src = (void *)runtime->dma_area; 53 } 54 } 55 56 static void read_pcm_s32(struct amdtp_stream *s, 57 struct snd_pcm_substream *pcm, 58 __le32 *buffer, unsigned int frames) 59 { 60 struct amdtp_ff *p = s->protocol; 61 struct snd_pcm_runtime *runtime = pcm->runtime; 62 unsigned int channels, remaining_frames, i, c; 63 u32 *dst; 64 65 channels = p->pcm_channels; 66 dst = (void *)runtime->dma_area + 67 frames_to_bytes(runtime, s->pcm_buffer_pointer); 68 remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; 69 70 for (i = 0; i < frames; ++i) { 71 for (c = 0; c < channels; ++c) { 72 *dst = le32_to_cpu(buffer[c]) & 0xffffff00; 73 dst++; 74 } 75 buffer += s->data_block_quadlets; 76 if (--remaining_frames == 0) 77 dst = (void *)runtime->dma_area; 78 } 79 } 80 81 static void write_pcm_silence(struct amdtp_stream *s, 82 __le32 *buffer, unsigned int frames) 83 { 84 struct amdtp_ff *p = s->protocol; 85 unsigned int i, c, channels = p->pcm_channels; 86 87 for (i = 0; i < frames; ++i) { 88 for (c = 0; c < channels; ++c) 89 buffer[c] = cpu_to_le32(0x00000000); 90 buffer += s->data_block_quadlets; 91 } 92 } 93 94 int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s, 95 struct snd_pcm_runtime *runtime) 96 { 97 int err; 98 99 err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); 100 if (err < 0) 101 return err; 102 103 return amdtp_stream_add_pcm_hw_constraints(s, runtime); 104 } 105 106 static unsigned int process_rx_data_blocks(struct amdtp_stream *s, 107 __be32 *buffer, 108 unsigned int data_blocks, 109 unsigned int *syt) 110 { 111 struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); 112 unsigned int pcm_frames; 113 114 if (pcm) { 115 write_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks); 116 pcm_frames = data_blocks; 117 } else { 118 write_pcm_silence(s, (__le32 *)buffer, data_blocks); 119 pcm_frames = 0; 120 } 121 122 return pcm_frames; 123 } 124 125 static unsigned int process_tx_data_blocks(struct amdtp_stream *s, 126 __be32 *buffer, 127 unsigned int data_blocks, 128 unsigned int *syt) 129 { 130 struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); 131 unsigned int pcm_frames; 132 133 if (pcm) { 134 read_pcm_s32(s, pcm, (__le32 *)buffer, data_blocks); 135 pcm_frames = data_blocks; 136 } else { 137 pcm_frames = 0; 138 } 139 140 return pcm_frames; 141 } 142 143 int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit, 144 enum amdtp_stream_direction dir) 145 { 146 amdtp_stream_process_data_blocks_t process_data_blocks; 147 148 if (dir == AMDTP_IN_STREAM) 149 process_data_blocks = process_tx_data_blocks; 150 else 151 process_data_blocks = process_rx_data_blocks; 152 153 return amdtp_stream_init(s, unit, dir, CIP_NO_HEADER, 0, 154 process_data_blocks, sizeof(struct amdtp_ff)); 155 } 156