soc/au1x/dma.c

42 	struct audio_stream stream[2];	/* playback & capture */
45 static void au1000_release_dma_link(struct audio_stream *stream)
50 	stream->period_size = 0;
51 	stream->periods = 0;
52 	pointer = stream->buffer;
59 	} while (pointer != stream->buffer);
60 	stream->buffer = NULL;
63 static int au1000_setup_dma_link(struct audio_stream *stream,
67 	struct snd_pcm_substream *substream = stream->substream;
75 	if (stream->period_size == period_bytes &&
76 	    stream->periods == periods)
79 	au1000_release_dma_link(stream);
81 	stream->period_size = period_bytes;
82 	stream->periods = periods;
84 	stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
85 	if (!stream->buffer)
87 	pointer = stream->buffer;
95 				au1000_release_dma_link(stream);
101 	pointer->next = stream->buffer;
105 static void au1000_dma_stop(struct audio_stream *stream)
107 	if (stream->buffer)
108 		disable_dma(stream->dma);
111 static void au1000_dma_start(struct audio_stream *stream)
113 	if (!stream->buffer)
116 	init_dma(stream->dma);
117 	if (get_dma_active_buffer(stream->dma) == 0) {
118 		clear_dma_done0(stream->dma);
119 		set_dma_addr0(stream->dma, stream->buffer->start);
120 		set_dma_count0(stream->dma, stream->period_size >> 1);
121 		set_dma_addr1(stream->dma, stream->buffer->next->start);
122 		set_dma_count1(stream->dma, stream->period_size >> 1);
124 		clear_dma_done1(stream->dma);
125 		set_dma_addr1(stream->dma, stream->buffer->start);
126 		set_dma_count1(stream->dma, stream->period_size >> 1);
127 		set_dma_addr0(stream->dma, stream->buffer->next->start);
128 		set_dma_count0(stream->dma, stream->period_size >> 1);
130 	enable_dma_buffers(stream->dma);
131 	start_dma(stream->dma);
136 	struct audio_stream *stream = (struct audio_stream *)ptr;
137 	struct snd_pcm_substream *substream = stream->substream;
139 	switch (get_dma_buffer_done(stream->dma)) {
141 		stream->buffer = stream->buffer->next;
142 		clear_dma_done0(stream->dma);
143 		set_dma_addr0(stream->dma, stream->buffer->next->start);
144 		set_dma_count0(stream->dma, stream->period_size >> 1);
145 		enable_dma_buffer0(stream->dma);
148 		stream->buffer = stream->buffer->next;
149 		clear_dma_done1(stream->dma);
150 		set_dma_addr1(stream->dma, stream->buffer->next->start);
151 		set_dma_count1(stream->dma, stream->period_size >> 1);
152 		enable_dma_buffer1(stream->dma);
155 		pr_debug("DMA %d missed interrupt.\n", stream->dma);
156 		au1000_dma_stop(stream);
157 		au1000_dma_start(stream);
160 		pr_debug("DMA %d empty irq.\n", stream->dma);
187 	return &(ctx->stream[ss->stream]);
195 	int *dmaids, s = substream->stream;
204 	ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
206 					&ctx->stream[s]);
207 	set_dma_mode(ctx->stream[s].dma,
208 		     get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);
210 	ctx->stream[s].substream = substream;
211 	ctx->stream[s].buffer = NULL;
221 	int stype = substream->stream;
223 	ctx->stream[stype].substream = NULL;
224 	free_au1000_dma(ctx->stream[stype].dma);
233 	struct audio_stream *stream = ss_to_as(substream, component);
235 	return au1000_setup_dma_link(stream,
243 	struct audio_stream *stream = ss_to_as(substream, component);
244 	au1000_release_dma_link(stream);
251 	struct audio_stream *stream = ss_to_as(substream, component);
256 		au1000_dma_start(stream);
259 		au1000_dma_stop(stream);
271 	struct audio_stream *stream = ss_to_as(ss, component);
274 	location = get_dma_residue(stream->dma);
275 	location = stream->buffer->relative_end - location;