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Diffstat (limited to 'sound/soc/pxa/pxa2xx-pcm.c')
-rw-r--r--sound/soc/pxa/pxa2xx-pcm.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/sound/soc/pxa/pxa2xx-pcm.c b/sound/soc/pxa/pxa2xx-pcm.c
new file mode 100644
index 000000000..a51c9da66
--- /dev/null
+++ b/sound/soc/pxa/pxa2xx-pcm.c
@@ -0,0 +1,157 @@
+/*
+ * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
+ *
+ * Author: Nicolas Pitre
+ * Created: Nov 30, 2004
+ * Copyright: (C) 2004 MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/dmaengine.h>
+#include <linux/of.h>
+
+#include <mach/dma.h>
+
+#include <sound/core.h>
+#include <sound/soc.h>
+#include <sound/pxa2xx-lib.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "../../arm/pxa2xx-pcm.h"
+
+static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct pxa2xx_runtime_data *prtd = runtime->private_data;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_dmaengine_dai_dma_data *dma;
+ int ret;
+
+ dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+
+ /* return if this is a bufferless transfer e.g.
+ * codec <--> BT codec or GSM modem -- lg FIXME */
+ if (!dma)
+ return 0;
+
+ /* this may get called several times by oss emulation
+ * with different params */
+ if (prtd->params == NULL) {
+ prtd->params = dma;
+ ret = pxa_request_dma("name", DMA_PRIO_LOW,
+ pxa2xx_pcm_dma_irq, substream);
+ if (ret < 0)
+ return ret;
+ prtd->dma_ch = ret;
+ } else if (prtd->params != dma) {
+ pxa_free_dma(prtd->dma_ch);
+ prtd->params = dma;
+ ret = pxa_request_dma("name", DMA_PRIO_LOW,
+ pxa2xx_pcm_dma_irq, substream);
+ if (ret < 0)
+ return ret;
+ prtd->dma_ch = ret;
+ }
+
+ return __pxa2xx_pcm_hw_params(substream, params);
+}
+
+static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
+
+ __pxa2xx_pcm_hw_free(substream);
+
+ if (prtd->dma_ch >= 0) {
+ pxa_free_dma(prtd->dma_ch);
+ prtd->dma_ch = -1;
+ prtd->params = NULL;
+ }
+
+ return 0;
+}
+
+static struct snd_pcm_ops pxa2xx_pcm_ops = {
+ .open = __pxa2xx_pcm_open,
+ .close = __pxa2xx_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = pxa2xx_pcm_hw_params,
+ .hw_free = pxa2xx_pcm_hw_free,
+ .prepare = __pxa2xx_pcm_prepare,
+ .trigger = pxa2xx_pcm_trigger,
+ .pointer = pxa2xx_pcm_pointer,
+ .mmap = pxa2xx_pcm_mmap,
+};
+
+static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_card *card = rtd->card->snd_card;
+ struct snd_pcm *pcm = rtd->pcm;
+ int ret;
+
+ ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+ ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_PLAYBACK);
+ if (ret)
+ goto out;
+ }
+
+ if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+ ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_CAPTURE);
+ if (ret)
+ goto out;
+ }
+ out:
+ return ret;
+}
+
+static struct snd_soc_platform_driver pxa2xx_soc_platform = {
+ .ops = &pxa2xx_pcm_ops,
+ .pcm_new = pxa2xx_soc_pcm_new,
+ .pcm_free = pxa2xx_pcm_free_dma_buffers,
+};
+
+static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
+{
+ return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
+}
+
+static int pxa2xx_soc_platform_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_platform(&pdev->dev);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id snd_soc_pxa_audio_match[] = {
+ { .compatible = "mrvl,pxa-pcm-audio" },
+ { }
+};
+#endif
+
+static struct platform_driver pxa_pcm_driver = {
+ .driver = {
+ .name = "pxa-pcm-audio",
+ .of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
+ },
+
+ .probe = pxa2xx_soc_platform_probe,
+ .remove = pxa2xx_soc_platform_remove,
+};
+
+module_platform_driver(pxa_pcm_driver);
+
+MODULE_AUTHOR("Nicolas Pitre");
+MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
+MODULE_LICENSE("GPL");