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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ff-stream.c - a part of driver for RME Fireface series4 *5 * Copyright (c) 2015-2017 Takashi Sakamoto6 */7 8#include "ff.h"9 10#define READY_TIMEOUT_MS 20011 12int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,13 enum snd_ff_stream_mode *mode)14{15 static const enum snd_ff_stream_mode modes[] = {16 [CIP_SFC_32000] = SND_FF_STREAM_MODE_LOW,17 [CIP_SFC_44100] = SND_FF_STREAM_MODE_LOW,18 [CIP_SFC_48000] = SND_FF_STREAM_MODE_LOW,19 [CIP_SFC_88200] = SND_FF_STREAM_MODE_MID,20 [CIP_SFC_96000] = SND_FF_STREAM_MODE_MID,21 [CIP_SFC_176400] = SND_FF_STREAM_MODE_HIGH,22 [CIP_SFC_192000] = SND_FF_STREAM_MODE_HIGH,23 };24 25 if (sfc >= CIP_SFC_COUNT)26 return -EINVAL;27 28 *mode = modes[sfc];29 30 return 0;31}32 33static inline void finish_session(struct snd_ff *ff)34{35 ff->spec->protocol->finish_session(ff);36 ff->spec->protocol->switch_fetching_mode(ff, false);37}38 39static int init_stream(struct snd_ff *ff, struct amdtp_stream *s)40{41 struct fw_iso_resources *resources;42 enum amdtp_stream_direction dir;43 int err;44 45 if (s == &ff->tx_stream) {46 resources = &ff->tx_resources;47 dir = AMDTP_IN_STREAM;48 } else {49 resources = &ff->rx_resources;50 dir = AMDTP_OUT_STREAM;51 }52 53 err = fw_iso_resources_init(resources, ff->unit);54 if (err < 0)55 return err;56 57 err = amdtp_ff_init(s, ff->unit, dir);58 if (err < 0)59 fw_iso_resources_destroy(resources);60 61 return err;62}63 64static void destroy_stream(struct snd_ff *ff, struct amdtp_stream *s)65{66 amdtp_stream_destroy(s);67 68 if (s == &ff->tx_stream)69 fw_iso_resources_destroy(&ff->tx_resources);70 else71 fw_iso_resources_destroy(&ff->rx_resources);72}73 74int snd_ff_stream_init_duplex(struct snd_ff *ff)75{76 int err;77 78 err = init_stream(ff, &ff->rx_stream);79 if (err < 0)80 return err;81 82 err = init_stream(ff, &ff->tx_stream);83 if (err < 0) {84 destroy_stream(ff, &ff->rx_stream);85 return err;86 }87 88 err = amdtp_domain_init(&ff->domain);89 if (err < 0) {90 destroy_stream(ff, &ff->rx_stream);91 destroy_stream(ff, &ff->tx_stream);92 }93 94 return err;95}96 97/*98 * This function should be called before starting streams or after stopping99 * streams.100 */101void snd_ff_stream_destroy_duplex(struct snd_ff *ff)102{103 amdtp_domain_destroy(&ff->domain);104 105 destroy_stream(ff, &ff->rx_stream);106 destroy_stream(ff, &ff->tx_stream);107}108 109int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,110 unsigned int frames_per_period,111 unsigned int frames_per_buffer)112{113 unsigned int curr_rate;114 enum snd_ff_clock_src src;115 int err;116 117 err = ff->spec->protocol->get_clock(ff, &curr_rate, &src);118 if (err < 0)119 return err;120 121 if (ff->substreams_counter == 0 || curr_rate != rate) {122 enum snd_ff_stream_mode mode;123 int i;124 125 amdtp_domain_stop(&ff->domain);126 finish_session(ff);127 128 fw_iso_resources_free(&ff->tx_resources);129 fw_iso_resources_free(&ff->rx_resources);130 131 for (i = 0; i < CIP_SFC_COUNT; ++i) {132 if (amdtp_rate_table[i] == rate)133 break;134 }135 if (i >= CIP_SFC_COUNT)136 return -EINVAL;137 138 err = snd_ff_stream_get_multiplier_mode(i, &mode);139 if (err < 0)140 return err;141 142 err = amdtp_ff_set_parameters(&ff->tx_stream, rate,143 ff->spec->pcm_capture_channels[mode]);144 if (err < 0)145 return err;146 147 err = amdtp_ff_set_parameters(&ff->rx_stream, rate,148 ff->spec->pcm_playback_channels[mode]);149 if (err < 0)150 return err;151 152 err = ff->spec->protocol->allocate_resources(ff, rate);153 if (err < 0)154 return err;155 156 err = amdtp_domain_set_events_per_period(&ff->domain,157 frames_per_period, frames_per_buffer);158 if (err < 0) {159 fw_iso_resources_free(&ff->tx_resources);160 fw_iso_resources_free(&ff->rx_resources);161 return err;162 }163 }164 165 return 0;166}167 168int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)169{170 int err;171 172 if (ff->substreams_counter == 0)173 return 0;174 175 if (amdtp_streaming_error(&ff->tx_stream) ||176 amdtp_streaming_error(&ff->rx_stream)) {177 amdtp_domain_stop(&ff->domain);178 finish_session(ff);179 }180 181 /*182 * Regardless of current source of clock signal, drivers transfer some183 * packets. Then, the device transfers packets.184 */185 if (!amdtp_stream_running(&ff->rx_stream)) {186 int spd = fw_parent_device(ff->unit)->max_speed;187 188 err = ff->spec->protocol->begin_session(ff, rate);189 if (err < 0)190 goto error;191 192 err = amdtp_domain_add_stream(&ff->domain, &ff->rx_stream,193 ff->rx_resources.channel, spd);194 if (err < 0)195 goto error;196 197 err = amdtp_domain_add_stream(&ff->domain, &ff->tx_stream,198 ff->tx_resources.channel, spd);199 if (err < 0)200 goto error;201 202 // NOTE: The device doesn't transfer packets unless receiving any packet. The203 // sequence of tx packets includes cycle skip corresponding to empty packet or204 // NODATA packet in IEC 61883-1/6. The sequence of the number of data blocks per205 // packet is important for media clock recovery.206 err = amdtp_domain_start(&ff->domain, 0, true, true);207 if (err < 0)208 goto error;209 210 if (!amdtp_domain_wait_ready(&ff->domain, READY_TIMEOUT_MS)) {211 err = -ETIMEDOUT;212 goto error;213 }214 215 err = ff->spec->protocol->switch_fetching_mode(ff, true);216 if (err < 0)217 goto error;218 }219 220 return 0;221error:222 amdtp_domain_stop(&ff->domain);223 finish_session(ff);224 225 return err;226}227 228void snd_ff_stream_stop_duplex(struct snd_ff *ff)229{230 if (ff->substreams_counter == 0) {231 amdtp_domain_stop(&ff->domain);232 finish_session(ff);233 234 fw_iso_resources_free(&ff->tx_resources);235 fw_iso_resources_free(&ff->rx_resources);236 }237}238 239void snd_ff_stream_update_duplex(struct snd_ff *ff)240{241 amdtp_domain_stop(&ff->domain);242 243 // The device discontinue to transfer packets.244 amdtp_stream_pcm_abort(&ff->tx_stream);245 amdtp_stream_pcm_abort(&ff->rx_stream);246}247 248void snd_ff_stream_lock_changed(struct snd_ff *ff)249{250 ff->dev_lock_changed = true;251 wake_up(&ff->hwdep_wait);252}253 254int snd_ff_stream_lock_try(struct snd_ff *ff)255{256 int err;257 258 spin_lock_irq(&ff->lock);259 260 /* user land lock this */261 if (ff->dev_lock_count < 0) {262 err = -EBUSY;263 goto end;264 }265 266 /* this is the first time */267 if (ff->dev_lock_count++ == 0)268 snd_ff_stream_lock_changed(ff);269 err = 0;270end:271 spin_unlock_irq(&ff->lock);272 return err;273}274 275void snd_ff_stream_lock_release(struct snd_ff *ff)276{277 spin_lock_irq(&ff->lock);278 279 if (WARN_ON(ff->dev_lock_count <= 0))280 goto end;281 if (--ff->dev_lock_count == 0)282 snd_ff_stream_lock_changed(ff);283end:284 spin_unlock_irq(&ff->lock);285}286