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09c434b8a0
Add SPDX license identifiers to all files which: - Have no license information of any form - Have MODULE_LICENCE("GPL*") inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
336 lines
8.6 KiB
C
336 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Au1000/Au1500/Au1100 Audio DMA support.
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*
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* (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
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*
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* copied almost verbatim from the old ALSA driver, written by
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* Charles Eidsness <charles@cooper-street.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <asm/mach-au1x00/au1000.h>
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#include <asm/mach-au1x00/au1000_dma.h>
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#include "psc.h"
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#define DRV_NAME "au1x_dma"
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struct pcm_period {
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u32 start;
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u32 relative_end; /* relative to start of buffer */
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struct pcm_period *next;
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};
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struct audio_stream {
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struct snd_pcm_substream *substream;
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int dma;
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struct pcm_period *buffer;
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unsigned int period_size;
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unsigned int periods;
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};
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struct alchemy_pcm_ctx {
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struct audio_stream stream[2]; /* playback & capture */
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};
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static void au1000_release_dma_link(struct audio_stream *stream)
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{
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struct pcm_period *pointer;
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struct pcm_period *pointer_next;
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stream->period_size = 0;
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stream->periods = 0;
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pointer = stream->buffer;
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if (!pointer)
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return;
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do {
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pointer_next = pointer->next;
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kfree(pointer);
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pointer = pointer_next;
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} while (pointer != stream->buffer);
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stream->buffer = NULL;
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}
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static int au1000_setup_dma_link(struct audio_stream *stream,
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unsigned int period_bytes,
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unsigned int periods)
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{
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struct snd_pcm_substream *substream = stream->substream;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct pcm_period *pointer;
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unsigned long dma_start;
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int i;
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dma_start = virt_to_phys(runtime->dma_area);
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if (stream->period_size == period_bytes &&
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stream->periods == periods)
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return 0; /* not changed */
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au1000_release_dma_link(stream);
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stream->period_size = period_bytes;
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stream->periods = periods;
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stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
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if (!stream->buffer)
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return -ENOMEM;
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pointer = stream->buffer;
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for (i = 0; i < periods; i++) {
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pointer->start = (u32)(dma_start + (i * period_bytes));
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pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
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if (i < periods - 1) {
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pointer->next = kmalloc(sizeof(struct pcm_period),
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GFP_KERNEL);
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if (!pointer->next) {
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au1000_release_dma_link(stream);
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return -ENOMEM;
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}
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pointer = pointer->next;
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}
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}
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pointer->next = stream->buffer;
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return 0;
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}
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static void au1000_dma_stop(struct audio_stream *stream)
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{
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if (stream->buffer)
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disable_dma(stream->dma);
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}
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static void au1000_dma_start(struct audio_stream *stream)
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{
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if (!stream->buffer)
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return;
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init_dma(stream->dma);
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if (get_dma_active_buffer(stream->dma) == 0) {
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clear_dma_done0(stream->dma);
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set_dma_addr0(stream->dma, stream->buffer->start);
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set_dma_count0(stream->dma, stream->period_size >> 1);
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set_dma_addr1(stream->dma, stream->buffer->next->start);
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set_dma_count1(stream->dma, stream->period_size >> 1);
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} else {
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clear_dma_done1(stream->dma);
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set_dma_addr1(stream->dma, stream->buffer->start);
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set_dma_count1(stream->dma, stream->period_size >> 1);
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set_dma_addr0(stream->dma, stream->buffer->next->start);
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set_dma_count0(stream->dma, stream->period_size >> 1);
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}
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enable_dma_buffers(stream->dma);
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start_dma(stream->dma);
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}
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static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
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{
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struct audio_stream *stream = (struct audio_stream *)ptr;
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struct snd_pcm_substream *substream = stream->substream;
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switch (get_dma_buffer_done(stream->dma)) {
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case DMA_D0:
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stream->buffer = stream->buffer->next;
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clear_dma_done0(stream->dma);
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set_dma_addr0(stream->dma, stream->buffer->next->start);
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set_dma_count0(stream->dma, stream->period_size >> 1);
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enable_dma_buffer0(stream->dma);
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break;
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case DMA_D1:
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stream->buffer = stream->buffer->next;
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clear_dma_done1(stream->dma);
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set_dma_addr1(stream->dma, stream->buffer->next->start);
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set_dma_count1(stream->dma, stream->period_size >> 1);
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enable_dma_buffer1(stream->dma);
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break;
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case (DMA_D0 | DMA_D1):
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pr_debug("DMA %d missed interrupt.\n", stream->dma);
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au1000_dma_stop(stream);
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au1000_dma_start(stream);
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break;
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case (~DMA_D0 & ~DMA_D1):
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pr_debug("DMA %d empty irq.\n", stream->dma);
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}
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snd_pcm_period_elapsed(substream);
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return IRQ_HANDLED;
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}
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static const struct snd_pcm_hardware alchemy_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
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.period_bytes_min = 1024,
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.period_bytes_max = 16 * 1024 - 1,
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.periods_min = 4,
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.periods_max = 255,
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.buffer_bytes_max = 128 * 1024,
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.fifo_size = 16,
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};
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static inline struct alchemy_pcm_ctx *ss_to_ctx(struct snd_pcm_substream *ss)
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{
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struct snd_soc_pcm_runtime *rtd = ss->private_data;
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struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
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return snd_soc_component_get_drvdata(component);
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}
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static inline struct audio_stream *ss_to_as(struct snd_pcm_substream *ss)
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{
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struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
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return &(ctx->stream[ss->stream]);
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}
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static int alchemy_pcm_open(struct snd_pcm_substream *substream)
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{
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struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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int *dmaids, s = substream->stream;
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char *name;
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dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (!dmaids)
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return -ENODEV; /* whoa, has ordering changed? */
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/* DMA setup */
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name = (s == SNDRV_PCM_STREAM_PLAYBACK) ? "audio-tx" : "audio-rx";
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ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
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au1000_dma_interrupt, 0,
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&ctx->stream[s]);
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set_dma_mode(ctx->stream[s].dma,
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get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);
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ctx->stream[s].substream = substream;
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ctx->stream[s].buffer = NULL;
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snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);
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return 0;
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}
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static int alchemy_pcm_close(struct snd_pcm_substream *substream)
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{
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struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
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int stype = substream->stream;
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ctx->stream[stype].substream = NULL;
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free_au1000_dma(ctx->stream[stype].dma);
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return 0;
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}
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static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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struct audio_stream *stream = ss_to_as(substream);
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int err;
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err = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (err < 0)
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return err;
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err = au1000_setup_dma_link(stream,
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params_period_bytes(hw_params),
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params_periods(hw_params));
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if (err)
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snd_pcm_lib_free_pages(substream);
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return err;
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}
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static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct audio_stream *stream = ss_to_as(substream);
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au1000_release_dma_link(stream);
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return snd_pcm_lib_free_pages(substream);
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}
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static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct audio_stream *stream = ss_to_as(substream);
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int err = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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au1000_dma_start(stream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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au1000_dma_stop(stream);
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
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{
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struct audio_stream *stream = ss_to_as(ss);
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long location;
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location = get_dma_residue(stream->dma);
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location = stream->buffer->relative_end - location;
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if (location == -1)
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location = 0;
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return bytes_to_frames(ss->runtime, location);
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}
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static const struct snd_pcm_ops alchemy_pcm_ops = {
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.open = alchemy_pcm_open,
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.close = alchemy_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = alchemy_pcm_hw_params,
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.hw_free = alchemy_pcm_hw_free,
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.trigger = alchemy_pcm_trigger,
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.pointer = alchemy_pcm_pointer,
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};
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static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_pcm *pcm = rtd->pcm;
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snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
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snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);
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return 0;
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}
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static struct snd_soc_component_driver alchemy_pcm_soc_component = {
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.name = DRV_NAME,
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.ops = &alchemy_pcm_ops,
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.pcm_new = alchemy_pcm_new,
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};
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static int alchemy_pcm_drvprobe(struct platform_device *pdev)
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{
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struct alchemy_pcm_ctx *ctx;
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ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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platform_set_drvdata(pdev, ctx);
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return devm_snd_soc_register_component(&pdev->dev,
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&alchemy_pcm_soc_component, NULL, 0);
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}
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static struct platform_driver alchemy_pcmdma_driver = {
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.driver = {
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.name = "alchemy-pcm-dma",
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},
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.probe = alchemy_pcm_drvprobe,
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};
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module_platform_driver(alchemy_pcmdma_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
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MODULE_AUTHOR("Manuel Lauss");
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