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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/sound/firewire/motu/amdtp-motu.c
....@@ -1,9 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * amdtp-motu.c - a part of driver for MOTU FireWire series
34  *
45  * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
5
- *
6
- * Licensed under the terms of the GNU General Public License, version 2.
76  */
87 
98 #include <linux/slab.h>
....@@ -77,15 +76,11 @@
7776 	if (i == ARRAY_SIZE(snd_motu_clock_rates))
7877 		return -EINVAL;
7978 
80
-	pcm_chunks = formats->fixed_part_pcm_chunks[mode] +
81
-		     formats->differed_part_pcm_chunks[mode];
79
+	// Each data block includes SPH in its head. Data chunks follow with
80
+	// 3 byte alignment. Padding follows with zero to conform to quadlet
81
+	// alignment.
82
+	pcm_chunks = formats->pcm_chunks[mode];
8283 	data_chunks = formats->msg_chunks + pcm_chunks;
83
-
84
-	/*
85
-	 * Each data block includes SPH in its head. Data chunks follow with
86
-	 * 3 byte alignment. Padding follows with zero to conform to quadlet
87
-	 * alignment.
88
-	 */
8984 	data_block_quadlets = 1 + DIV_ROUND_UP(data_chunks * 3, 4);
9085 
9186 	err = amdtp_stream_set_parameters(s, rate, data_block_quadlets);
....@@ -118,19 +113,25 @@
118113 	return 0;
119114 }
120115 
121
-static void read_pcm_s32(struct amdtp_stream *s,
122
-			 struct snd_pcm_runtime *runtime,
123
-			 __be32 *buffer, unsigned int data_blocks)
116
+static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
117
+			 __be32 *buffer, unsigned int data_blocks,
118
+			 unsigned int pcm_frames)
124119 {
125120 	struct amdtp_motu *p = s->protocol;
126
-	unsigned int channels, remaining_frames, i, c;
121
+	unsigned int channels = p->pcm_chunks;
122
+	struct snd_pcm_runtime *runtime = pcm->runtime;
123
+	unsigned int pcm_buffer_pointer;
124
+	int remaining_frames;
127125 	u8 *byte;
128126 	u32 *dst;
127
+	int i, c;
129128 
130
-	channels = p->pcm_chunks;
129
+	pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
130
+	pcm_buffer_pointer %= runtime->buffer_size;
131
+
131132 	dst = (void *)runtime->dma_area +
132
-			frames_to_bytes(runtime, s->pcm_buffer_pointer);
133
-	remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
133
+				frames_to_bytes(runtime, pcm_buffer_pointer);
134
+	remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
134135 
135136 	for (i = 0; i < data_blocks; ++i) {
136137 		byte = (u8 *)buffer + p->pcm_byte_offset;
....@@ -148,19 +149,25 @@
148149 	}
149150 }
150151 
151
-static void write_pcm_s32(struct amdtp_stream *s,
152
-			  struct snd_pcm_runtime *runtime,
153
-			  __be32 *buffer, unsigned int data_blocks)
152
+static void write_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
153
+			  __be32 *buffer, unsigned int data_blocks,
154
+			  unsigned int pcm_frames)
154155 {
155156 	struct amdtp_motu *p = s->protocol;
156
-	unsigned int channels, remaining_frames, i, c;
157
+	unsigned int channels = p->pcm_chunks;
158
+	struct snd_pcm_runtime *runtime = pcm->runtime;
159
+	unsigned int pcm_buffer_pointer;
160
+	int remaining_frames;
157161 	u8 *byte;
158162 	const u32 *src;
163
+	int i, c;
159164 
160
-	channels = p->pcm_chunks;
165
+	pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
166
+	pcm_buffer_pointer %= runtime->buffer_size;
167
+
161168 	src = (void *)runtime->dma_area +
162
-			frames_to_bytes(runtime, s->pcm_buffer_pointer);
163
-	remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
169
+				frames_to_bytes(runtime, pcm_buffer_pointer);
170
+	remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
164171 
165172 	for (i = 0; i < data_blocks; ++i) {
166173 		byte = (u8 *)buffer + p->pcm_byte_offset;
....@@ -299,24 +306,52 @@
299306 	}
300307 }
301308 
302
-static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
303
-				__be32 *buffer, unsigned int data_blocks,
304
-				unsigned int *syt)
309
+static void probe_tracepoints_events(struct amdtp_stream *s,
310
+				     const struct pkt_desc *descs,
311
+				     unsigned int packets)
312
+{
313
+	int i;
314
+
315
+	for (i = 0; i < packets; ++i) {
316
+		const struct pkt_desc *desc = descs + i;
317
+		__be32 *buf = desc->ctx_payload;
318
+		unsigned int data_blocks = desc->data_blocks;
319
+
320
+		trace_data_block_sph(s, data_blocks, buf);
321
+		trace_data_block_message(s, data_blocks, buf);
322
+	}
323
+}
324
+
325
+static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
326
+					    const struct pkt_desc *descs,
327
+					    unsigned int packets,
328
+					    struct snd_pcm_substream *pcm)
305329 {
306330 	struct amdtp_motu *p = s->protocol;
307
-	struct snd_pcm_substream *pcm;
331
+	unsigned int pcm_frames = 0;
332
+	int i;
308333 
309
-	trace_in_data_block_sph(s, data_blocks, buffer);
310
-	trace_in_data_block_message(s, data_blocks, buffer);
334
+	// For data block processing.
335
+	for (i = 0; i < packets; ++i) {
336
+		const struct pkt_desc *desc = descs + i;
337
+		__be32 *buf = desc->ctx_payload;
338
+		unsigned int data_blocks = desc->data_blocks;
311339 
312
-	if (p->midi_ports)
313
-		read_midi_messages(s, buffer, data_blocks);
340
+		if (pcm) {
341
+			read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
342
+			pcm_frames += data_blocks;
343
+		}
314344 
315
-	pcm = READ_ONCE(s->pcm);
316
-	if (data_blocks > 0 && pcm)
317
-		read_pcm_s32(s, pcm->runtime, buffer, data_blocks);
345
+		if (p->midi_ports)
346
+			read_midi_messages(s, buf, data_blocks);
347
+	}
318348 
319
-	return data_blocks;
349
+	// For tracepoints.
350
+	if (trace_data_block_sph_enabled() ||
351
+	    trace_data_block_message_enabled())
352
+		probe_tracepoints_events(s, descs, packets);
353
+
354
+	return pcm_frames;
320355 }
321356 
322357 static inline void compute_next_elapse_from_start(struct amdtp_motu *p)
....@@ -361,69 +396,91 @@
361396 	}
362397 }
363398 
364
-static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
365
-				__be32 *buffer, unsigned int data_blocks,
366
-				unsigned int *syt)
399
+static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
400
+					    const struct pkt_desc *descs,
401
+					    unsigned int packets,
402
+					    struct snd_pcm_substream *pcm)
367403 {
368
-	struct amdtp_motu *p = (struct amdtp_motu *)s->protocol;
369
-	struct snd_pcm_substream *pcm;
404
+	struct amdtp_motu *p = s->protocol;
405
+	unsigned int pcm_frames = 0;
406
+	int i;
370407 
371
-	/* Not used. */
372
-	*syt = 0xffff;
408
+	// For data block processing.
409
+	for (i = 0; i < packets; ++i) {
410
+		const struct pkt_desc *desc = descs + i;
411
+		__be32 *buf = desc->ctx_payload;
412
+		unsigned int data_blocks = desc->data_blocks;
373413 
374
-	/* TODO: how to interact control messages between userspace? */
414
+		if (pcm) {
415
+			write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
416
+			pcm_frames += data_blocks;
417
+		} else {
418
+			write_pcm_silence(s, buf, data_blocks);
419
+		}
375420 
376
-	if (p->midi_ports)
377
-		write_midi_messages(s, buffer, data_blocks);
421
+		if (p->midi_ports)
422
+			write_midi_messages(s, buf, data_blocks);
378423 
379
-	pcm = READ_ONCE(s->pcm);
380
-	if (pcm)
381
-		write_pcm_s32(s, pcm->runtime, buffer, data_blocks);
382
-	else
383
-		write_pcm_silence(s, buffer, data_blocks);
424
+		// TODO: how to interact control messages between userspace?
384425 
385
-	write_sph(s, buffer, data_blocks);
426
+		write_sph(s, buf, data_blocks);
427
+	}
386428 
387
-	trace_out_data_block_sph(s, data_blocks, buffer);
388
-	trace_out_data_block_message(s, data_blocks, buffer);
429
+	// For tracepoints.
430
+	if (trace_data_block_sph_enabled() ||
431
+	    trace_data_block_message_enabled())
432
+		probe_tracepoints_events(s, descs, packets);
389433 
390
-	return data_blocks;
434
+	return pcm_frames;
391435 }
392436 
393437 int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit,
394438 		    enum amdtp_stream_direction dir,
395
-		    const struct snd_motu_protocol *const protocol)
439
+		    const struct snd_motu_spec *spec)
396440 {
397
-	amdtp_stream_process_data_blocks_t process_data_blocks;
441
+	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
398442 	int fmt = CIP_FMT_MOTU;
399443 	int flags = CIP_BLOCKING;
400444 	int err;
401445 
402446 	if (dir == AMDTP_IN_STREAM) {
403
-		process_data_blocks = process_tx_data_blocks;
447
+		process_ctx_payloads = process_ir_ctx_payloads;
404448 
405449 		/*
406450 		 * Units of version 3 transmits packets with invalid CIP header
407451 		 * against IEC 61883-1.
408452 		 */
409
-		if (protocol == &snd_motu_protocol_v3) {
453
+		if (spec->protocol_version == SND_MOTU_PROTOCOL_V3) {
410454 			flags |= CIP_WRONG_DBS |
411455 				 CIP_SKIP_DBC_ZERO_CHECK |
412456 				 CIP_HEADER_WITHOUT_EOH;
413457 			fmt = CIP_FMT_MOTU_TX_V3;
414458 		}
459
+
460
+		if (spec == &snd_motu_spec_8pre ||
461
+		    spec == &snd_motu_spec_ultralite) {
462
+			// 8pre has some quirks.
463
+			flags |= CIP_WRONG_DBS |
464
+				 CIP_SKIP_DBC_ZERO_CHECK;
465
+		}
415466 	} else {
416
-		process_data_blocks = process_rx_data_blocks;
467
+		process_ctx_payloads = process_it_ctx_payloads;
417468 		flags |= CIP_DBC_IS_END_EVENT;
418469 	}
419470 
420
-	err = amdtp_stream_init(s, unit, dir, flags, fmt, process_data_blocks,
471
+	err = amdtp_stream_init(s, unit, dir, flags, fmt, process_ctx_payloads,
421472 				sizeof(struct amdtp_motu));
422473 	if (err < 0)
423474 		return err;
424475 
425476 	s->sph = 1;
426
-	s->fdf = MOTU_FDF_AM824;
477
+
478
+	if (dir == AMDTP_OUT_STREAM) {
479
+		// Use fixed value for FDF field.
480
+		s->ctx_data.rx.fdf = MOTU_FDF_AM824;
481
+		// Not used.
482
+		s->ctx_data.rx.syt_override = 0xffff;
483
+	}
427484 
428485 	return 0;
429486 }