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 } 155