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31ef9134 CL |
1 | #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED |
2 | #define SOUND_FIREWIRE_AMDTP_H_INCLUDED | |
3 | ||
20b65dd0 | 4 | #include <linux/err.h> |
76fb8789 | 5 | #include <linux/interrupt.h> |
31ef9134 | 6 | #include <linux/mutex.h> |
5955815e | 7 | #include <linux/sched.h> |
777fb574 | 8 | #include <sound/asound.h> |
31ef9134 CL |
9 | #include "packets-buffer.h" |
10 | ||
11 | /** | |
be4a2894 | 12 | * enum cip_flags - describes details of the streaming protocol |
31ef9134 CL |
13 | * @CIP_NONBLOCKING: In non-blocking mode, each packet contains |
14 | * sample_rate/8000 samples, with rounding up or down to adjust | |
15 | * for clock skew and left-over fractional samples. This should | |
16 | * be used if supported by the device. | |
e84d15f6 CL |
17 | * @CIP_BLOCKING: In blocking mode, each packet contains either zero or |
18 | * SYT_INTERVAL samples, with these two types alternating so that | |
19 | * the overall sample rate comes out right. | |
7ab56645 | 20 | * @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0. |
c8bdf49b TS |
21 | * @CIP_DBC_IS_END_EVENT: Only for in-stream. The value of dbc in an in-packet |
22 | * corresponds to the end of event in the packet. Out of IEC 61883. | |
69702239 TS |
23 | * @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets. |
24 | * The value of data_block_quadlets is used instead of reported value. | |
5f217f90 | 25 | * @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is |
b84b1a27 | 26 | * skipped for detecting discontinuity. |
9d59124c TS |
27 | * @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty |
28 | * packet is wrong but the others are correct. | |
a2064710 TS |
29 | * @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an |
30 | * packet is larger than IEC 61883-6 defines. Current implementation | |
31 | * allows 5 times as large as IEC 61883-6 defines. | |
31ef9134 | 32 | */ |
be4a2894 | 33 | enum cip_flags { |
7b3b0d85 TS |
34 | CIP_NONBLOCKING = 0x00, |
35 | CIP_BLOCKING = 0x01, | |
dec63cc8 TS |
36 | CIP_EMPTY_WITH_TAG0 = 0x02, |
37 | CIP_DBC_IS_END_EVENT = 0x04, | |
38 | CIP_WRONG_DBS = 0x08, | |
39 | CIP_SKIP_DBC_ZERO_CHECK = 0x10, | |
62f00e40 TS |
40 | CIP_EMPTY_HAS_WRONG_DBC = 0x20, |
41 | CIP_JUMBO_PAYLOAD = 0x40, | |
31ef9134 CL |
42 | }; |
43 | ||
44 | /** | |
5f217f90 TS |
45 | * enum cip_sfc - supported Sampling Frequency Codes (SFCs) |
46 | * @CIP_SFC_32000: 32,000 data blocks | |
47 | * @CIP_SFC_44100: 44,100 data blocks | |
48 | * @CIP_SFC_48000: 48,000 data blocks | |
49 | * @CIP_SFC_88200: 88,200 data blocks | |
50 | * @CIP_SFC_96000: 96,000 data blocks | |
51 | * @CIP_SFC_176400: 176,400 data blocks | |
52 | * @CIP_SFC_192000: 192,000 data blocks | |
53 | * @CIP_SFC_COUNT: the number of supported SFCs | |
54 | * | |
55 | * These values are used to show nominal Sampling Frequency Code in | |
56 | * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002, | |
57 | * this code means the number of events per second. Actually the code | |
58 | * represents the number of data blocks transferred per second in an AMDTP | |
59 | * stream. | |
60 | * | |
61 | * In IEC 61883-6:2005, some extensions were added to support more types of | |
62 | * data such as 'One Bit LInear Audio', therefore the meaning of SFC became | |
63 | * different depending on the types. | |
64 | * | |
65 | * Currently our implementation is compatible with IEC 61883-6:2002. | |
31ef9134 CL |
66 | */ |
67 | enum cip_sfc { | |
68 | CIP_SFC_32000 = 0, | |
69 | CIP_SFC_44100 = 1, | |
70 | CIP_SFC_48000 = 2, | |
71 | CIP_SFC_88200 = 3, | |
72 | CIP_SFC_96000 = 4, | |
73 | CIP_SFC_176400 = 5, | |
74 | CIP_SFC_192000 = 6, | |
a7304e3b | 75 | CIP_SFC_COUNT |
31ef9134 CL |
76 | }; |
77 | ||
31ef9134 CL |
78 | struct fw_unit; |
79 | struct fw_iso_context; | |
80 | struct snd_pcm_substream; | |
7b2d99fa | 81 | struct snd_pcm_runtime; |
31ef9134 | 82 | |
3ff7e8f0 TS |
83 | enum amdtp_stream_direction { |
84 | AMDTP_OUT_STREAM = 0, | |
85 | AMDTP_IN_STREAM | |
86 | }; | |
87 | ||
df075fee TS |
88 | struct amdtp_stream; |
89 | typedef unsigned int (*amdtp_stream_process_data_blocks_t)( | |
90 | struct amdtp_stream *s, | |
91 | __be32 *buffer, | |
92 | unsigned int data_blocks, | |
93 | unsigned int *syt); | |
be4a2894 | 94 | struct amdtp_stream { |
31ef9134 | 95 | struct fw_unit *unit; |
be4a2894 | 96 | enum cip_flags flags; |
3ff7e8f0 | 97 | enum amdtp_stream_direction direction; |
31ef9134 CL |
98 | struct mutex mutex; |
99 | ||
10b2b6dc TS |
100 | /* For packet processing. */ |
101 | struct fw_iso_context *context; | |
31ef9134 | 102 | struct iso_packets_buffer buffer; |
ec00f5e4 | 103 | int packet_index; |
10b2b6dc TS |
104 | |
105 | /* For CIP headers. */ | |
106 | unsigned int source_node_id_field; | |
107 | unsigned int data_block_quadlets; | |
31ef9134 | 108 | unsigned int data_block_counter; |
414ba022 TS |
109 | unsigned int fmt; |
110 | unsigned int fdf; | |
10b2b6dc TS |
111 | /* quirk: fixed interval of dbc between previos/current packets. */ |
112 | unsigned int tx_dbc_interval; | |
113 | /* quirk: indicate the value of dbc field in a first packet. */ | |
114 | unsigned int tx_first_dbc; | |
31ef9134 | 115 | |
10b2b6dc TS |
116 | /* Internal flags. */ |
117 | enum cip_sfc sfc; | |
118 | unsigned int syt_interval; | |
119 | unsigned int transfer_delay; | |
31ef9134 | 120 | unsigned int data_block_state; |
31ef9134 CL |
121 | unsigned int last_syt_offset; |
122 | unsigned int syt_offset_state; | |
123 | ||
10b2b6dc TS |
124 | /* For a PCM substream processing. */ |
125 | struct snd_pcm_substream *pcm; | |
126 | struct tasklet_struct period_tasklet; | |
31ef9134 CL |
127 | unsigned int pcm_buffer_pointer; |
128 | unsigned int pcm_period_pointer; | |
83d8d72d | 129 | |
10b2b6dc TS |
130 | /* To wait for first packet. */ |
131 | bool callbacked; | |
132 | wait_queue_head_t callback_wait; | |
10b2b6dc | 133 | |
df075fee TS |
134 | /* For backends to process data blocks. */ |
135 | void *protocol; | |
136 | amdtp_stream_process_data_blocks_t process_data_blocks; | |
31ef9134 CL |
137 | }; |
138 | ||
be4a2894 | 139 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
df075fee TS |
140 | enum amdtp_stream_direction dir, enum cip_flags flags, |
141 | unsigned int fmt, | |
142 | amdtp_stream_process_data_blocks_t process_data_blocks, | |
143 | unsigned int protocol_size); | |
be4a2894 | 144 | void amdtp_stream_destroy(struct amdtp_stream *s); |
31ef9134 | 145 | |
df075fee TS |
146 | int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, |
147 | unsigned int data_block_quadlets); | |
be4a2894 | 148 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s); |
31ef9134 | 149 | |
be4a2894 TS |
150 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed); |
151 | void amdtp_stream_update(struct amdtp_stream *s); | |
152 | void amdtp_stream_stop(struct amdtp_stream *s); | |
31ef9134 | 153 | |
7b2d99fa TS |
154 | int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, |
155 | struct snd_pcm_runtime *runtime); | |
df075fee | 156 | |
be4a2894 TS |
157 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s); |
158 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s); | |
159 | void amdtp_stream_pcm_abort(struct amdtp_stream *s); | |
31ef9134 | 160 | |
c5280e99 | 161 | extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT]; |
1017abed | 162 | extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT]; |
a7304e3b | 163 | |
be4a2894 TS |
164 | /** |
165 | * amdtp_stream_running - check stream is running or not | |
166 | * @s: the AMDTP stream | |
167 | * | |
168 | * If this function returns true, the stream is running. | |
169 | */ | |
170 | static inline bool amdtp_stream_running(struct amdtp_stream *s) | |
20b65dd0 CL |
171 | { |
172 | return !IS_ERR(s->context); | |
173 | } | |
174 | ||
ec00f5e4 | 175 | /** |
be4a2894 TS |
176 | * amdtp_streaming_error - check for streaming error |
177 | * @s: the AMDTP stream | |
ec00f5e4 CL |
178 | * |
179 | * If this function returns true, the stream's packet queue has stopped due to | |
180 | * an asynchronous error. | |
181 | */ | |
be4a2894 | 182 | static inline bool amdtp_streaming_error(struct amdtp_stream *s) |
ec00f5e4 CL |
183 | { |
184 | return s->packet_index < 0; | |
185 | } | |
186 | ||
83d8d72d TS |
187 | /** |
188 | * amdtp_stream_pcm_running - check PCM substream is running or not | |
189 | * @s: the AMDTP stream | |
190 | * | |
191 | * If this function returns true, PCM substream in the AMDTP stream is running. | |
192 | */ | |
193 | static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s) | |
194 | { | |
195 | return !!s->pcm; | |
196 | } | |
197 | ||
31ef9134 | 198 | /** |
be4a2894 TS |
199 | * amdtp_stream_pcm_trigger - start/stop playback from a PCM device |
200 | * @s: the AMDTP stream | |
31ef9134 CL |
201 | * @pcm: the PCM device to be started, or %NULL to stop the current device |
202 | * | |
203 | * Call this function on a running isochronous stream to enable the actual | |
204 | * transmission of PCM data. This function should be called from the PCM | |
205 | * device's .trigger callback. | |
206 | */ | |
be4a2894 TS |
207 | static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s, |
208 | struct snd_pcm_substream *pcm) | |
31ef9134 CL |
209 | { |
210 | ACCESS_ONCE(s->pcm) = pcm; | |
211 | } | |
212 | ||
31ef9134 CL |
213 | static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) |
214 | { | |
215 | return sfc & 1; | |
216 | } | |
217 | ||
7b3b0d85 TS |
218 | /** |
219 | * amdtp_stream_wait_callback - sleep till callbacked or timeout | |
220 | * @s: the AMDTP stream | |
221 | * @timeout: msec till timeout | |
222 | * | |
223 | * If this function return false, the AMDTP stream should be stopped. | |
224 | */ | |
225 | static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s, | |
226 | unsigned int timeout) | |
227 | { | |
228 | return wait_event_timeout(s->callback_wait, | |
229 | s->callbacked == true, | |
230 | msecs_to_jiffies(timeout)) > 0; | |
231 | } | |
232 | ||
31ef9134 | 233 | #endif |