[PATCH 2/4] ASoC: mmp: add audio dma support
Zhangfei Gao
zhangfei.gao at marvell.com
Fri May 25 03:11:01 EDT 2012
mmp-pcm handle audio dma based on dmaengine
Support mmp and pxa910
Signed-off-by: Zhangfei Gao <zhangfei.gao at marvell.com>
Signed-off-by: Leo Yan <leoy at marvell.com>
Signed-off-by: Qiao Zhou <zhouqiao at marvell.com>
---
include/linux/platform_data/mmp_audio.h | 22 ++
sound/soc/pxa/Kconfig | 8 +
sound/soc/pxa/Makefile | 2 +
sound/soc/pxa/mmp-pcm.c | 448 +++++++++++++++++++++++++++++++
4 files changed, 480 insertions(+), 0 deletions(-)
create mode 100644 include/linux/platform_data/mmp_audio.h
create mode 100644 sound/soc/pxa/mmp-pcm.c
diff --git a/include/linux/platform_data/mmp_audio.h b/include/linux/platform_data/mmp_audio.h
new file mode 100644
index 0000000..0f25d16
--- /dev/null
+++ b/include/linux/platform_data/mmp_audio.h
@@ -0,0 +1,22 @@
+/*
+ * MMP Platform AUDIO Management
+ *
+ * Copyright (c) 2011 Marvell Semiconductors 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.
+ *
+ */
+
+#ifndef MMP_AUDIO_H
+#define MMP_AUDIO_H
+
+struct mmp_audio_platdata {
+ u32 period_max_capture;
+ u32 buffer_max_capture;
+ u32 period_max_playback;
+ u32 buffer_max_playback;
+};
+
+#endif /* MMP_AUDIO_H */
diff --git a/sound/soc/pxa/Kconfig b/sound/soc/pxa/Kconfig
index a0f7d3c..a516068 100644
--- a/sound/soc/pxa/Kconfig
+++ b/sound/soc/pxa/Kconfig
@@ -8,6 +8,14 @@ config SND_PXA2XX_SOC
the PXA2xx AC97, I2S or SSP interface. You will also need
to select the audio interfaces to support below.
+config SND_MMP_SOC
+ bool "Soc Audio for Marvell MMP chips"
+ depends on ARCH_MMP
+ select SND_ARM
+ help
+ Say Y if you want to add support for codecs attached to
+ the MMP SSPA interface.
+
config SND_PXA2XX_AC97
tristate
select SND_AC97_CODEC
diff --git a/sound/soc/pxa/Makefile b/sound/soc/pxa/Makefile
index af35762..f913e9b 100644
--- a/sound/soc/pxa/Makefile
+++ b/sound/soc/pxa/Makefile
@@ -3,11 +3,13 @@ snd-soc-pxa2xx-objs := pxa2xx-pcm.o
snd-soc-pxa2xx-ac97-objs := pxa2xx-ac97.o
snd-soc-pxa2xx-i2s-objs := pxa2xx-i2s.o
snd-soc-pxa-ssp-objs := pxa-ssp.o
+snd-soc-mmp-objs := mmp-pcm.o
obj-$(CONFIG_SND_PXA2XX_SOC) += snd-soc-pxa2xx.o
obj-$(CONFIG_SND_PXA2XX_SOC_AC97) += snd-soc-pxa2xx-ac97.o
obj-$(CONFIG_SND_PXA2XX_SOC_I2S) += snd-soc-pxa2xx-i2s.o
obj-$(CONFIG_SND_PXA_SOC_SSP) += snd-soc-pxa-ssp.o
+obj-$(CONFIG_SND_MMP_SOC) += snd-soc-mmp.o
# PXA Machine Support
snd-soc-corgi-objs := corgi.o
diff --git a/sound/soc/pxa/mmp-pcm.c b/sound/soc/pxa/mmp-pcm.c
new file mode 100644
index 0000000..abafbb9
--- /dev/null
+++ b/sound/soc/pxa/mmp-pcm.c
@@ -0,0 +1,448 @@
+/*
+ * linux/sound/soc/pxa/mmp-pcm.c
+ *
+ * Copyright (C) 2011 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/platform_data/mmp_dma.h>
+#include <linux/platform_data/mmp_audio.h>
+#include <sound/pxa2xx-lib.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <mach/sram.h>
+
+struct mmp_runtime_data {
+ int ssp_id;
+ u32 period_size;
+ u32 pointer;
+ struct resource *dma_res;
+ struct mmp_tdma_data tdma_data;
+ struct gen_pool *gpool;
+ struct snd_pcm_substream *substream;
+ struct dma_chan *dma_chan;
+ struct dma_async_tx_descriptor *desc;
+};
+
+#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP | \
+ SNDRV_PCM_INFO_MMAP_VALID | \
+ SNDRV_PCM_INFO_INTERLEAVED | \
+ SNDRV_PCM_INFO_PAUSE | \
+ SNDRV_PCM_INFO_RESUME)
+
+#define MMP_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_pcm_hardware mmp_pcm_hardware[] = {
+ {
+ .info = MMP_PCM_INFO,
+ .formats = MMP_PCM_FORMATS,
+ .period_bytes_min = 1024,
+ .period_bytes_max = 2048,
+ .periods_min = 2,
+ .periods_max = 32,
+ .buffer_bytes_max = 4096,
+ .fifo_size = 32,
+ },
+ {
+ .info = MMP_PCM_INFO,
+ .formats = MMP_PCM_FORMATS,
+ .period_bytes_min = 1024,
+ .period_bytes_max = 2048,
+ .periods_min = 2,
+ .periods_max = 32,
+ .buffer_bytes_max = 4096,
+ .fifo_size = 32,
+ },
+};
+
+static void mmp_pcm_adma_irq(void *data)
+{
+ struct snd_pcm_substream *substream = data;
+ struct mmp_runtime_data *prtd = substream->runtime->private_data;
+ size_t dma_bytes = substream->runtime->dma_bytes;
+
+ prtd->pointer = (prtd->pointer + prtd->period_size) % dma_bytes;
+ snd_pcm_period_elapsed(substream);
+ return;
+}
+
+static bool filter(struct dma_chan *chan, void *param)
+{
+ struct mmp_runtime_data *prtd = param;
+ bool found = false;
+ char *devname;
+
+ devname = kasprintf(GFP_KERNEL, "%s.%d", prtd->dma_res->name,
+ prtd->ssp_id);
+ if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
+ (chan->chan_id == prtd->dma_res->start)) {
+ chan->private = &prtd->tdma_data;
+ found = true;
+ }
+
+ kfree(devname);
+ return found;
+}
+
+static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct mmp_runtime_data *prtd = runtime->private_data;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct pxa2xx_pcm_dma_params *dma_params;
+ size_t totsize = params_buffer_bytes(params);
+ size_t period = params_period_bytes(params);
+ int ret;
+ struct dma_slave_config slave_config;
+ dma_cap_mask_t mask;
+
+ dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+ if (!dma_params)
+ return 0;
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S8:
+ prtd->tdma_data.bus_size = 8;
+ break;
+ case SNDRV_PCM_FORMAT_S16_LE:
+ prtd->tdma_data.bus_size = 16;
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ prtd->tdma_data.bus_size = 24;
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ prtd->tdma_data.bus_size = 32;
+ break;
+ default:
+ return -EINVAL;
+ }
+ prtd->tdma_data.pack_mod = true;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_CYCLIC, mask);
+ prtd->dma_chan = dma_request_channel(mask, filter, prtd);
+ if (!prtd->dma_chan)
+ return -EINVAL;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ slave_config.direction = DMA_TO_DEVICE;
+ slave_config.dst_addr = dma_params->dev_addr;
+ slave_config.dst_maxburst = 4;
+ } else {
+ slave_config.direction = DMA_FROM_DEVICE;
+ slave_config.src_addr = dma_params->dev_addr;
+ slave_config.src_maxburst = 4;
+ }
+
+ ret = dmaengine_slave_config(prtd->dma_chan, &slave_config);
+ if (ret)
+ return ret;
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+ prtd->period_size = period;
+ runtime->dma_bytes = totsize;
+
+ prtd->desc = prtd->dma_chan->device->device_prep_dma_cyclic(
+ prtd->dma_chan, runtime->dma_addr, totsize, period,
+ substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE, NULL);
+ if (!prtd->desc) {
+ dev_err(&prtd->dma_chan->dev->device, "cannot prepare slave dma\n");
+ return -EINVAL;
+ }
+
+ prtd->desc->callback = mmp_pcm_adma_irq;
+ prtd->desc->callback_param = substream;
+ dmaengine_submit(prtd->desc);
+ return 0;
+}
+
+static int mmp_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct mmp_runtime_data *prtd = substream->runtime->private_data;
+
+ if (prtd->dma_chan) {
+ dma_release_channel(prtd->dma_chan);
+ prtd->dma_chan = NULL;
+ }
+
+ return 0;
+}
+
+static int mmp_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct mmp_runtime_data *prtd = substream->runtime->private_data;
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ prtd->pointer = 0;
+ dma_async_issue_pending(prtd->dma_chan);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ dmaengine_terminate_all(prtd->dma_chan);
+ break;
+
+ case SNDRV_PCM_TRIGGER_RESUME:
+ dma_async_issue_pending(prtd->dma_chan);
+ break;
+
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ dma_async_issue_pending(prtd->dma_chan);
+ break;
+
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static snd_pcm_uframes_t mmp_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct mmp_runtime_data *prtd = runtime->private_data;
+ snd_pcm_uframes_t x;
+
+ x = bytes_to_frames(runtime, prtd->pointer);
+ if (x == runtime->buffer_size)
+ x = 0;
+
+ return x;
+}
+
+static int mmp_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct platform_device *pdev = to_platform_device(rtd->platform->dev);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+ struct mmp_runtime_data *prtd;
+ struct resource *r;
+ int ret;
+
+ r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
+ if (!r)
+ return -EBUSY;
+
+ snd_soc_set_runtime_hwparams(substream,
+ &mmp_pcm_hardware[substream->stream]);
+
+ /*
+ * For mysterious reasons (and despite what the manual says)
+ * playback samples are lost if the DMA count is not a multiple
+ * of the DMA burst size. Let's add a rule to enforce that.
+ */
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
+ if (ret)
+ goto out;
+
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
+ if (ret)
+ goto out;
+
+ ret = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0)
+ goto out;
+
+ prtd = devm_kzalloc(&pdev->dev,
+ sizeof(struct mmp_runtime_data), GFP_KERNEL);
+ if (prtd == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ prtd->substream = substream;
+ runtime->private_data = prtd;
+ prtd->dma_res = r;
+ prtd->ssp_id = cpu_dai->id;
+ return 0;
+
+out:
+ return ret;
+}
+
+static int mmp_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct platform_device *pdev = to_platform_device(rtd->platform->dev);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct mmp_runtime_data *prtd = runtime->private_data;
+
+ devm_kfree(&pdev->dev, prtd);
+ runtime->private_data = NULL;
+ return 0;
+}
+
+static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *vma)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ unsigned long off = vma->vm_pgoff;
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ return remap_pfn_range(vma, vma->vm_start,
+ __phys_to_pfn(runtime->dma_addr) + off,
+ vma->vm_end - vma->vm_start, vma->vm_page_prot);
+}
+
+struct snd_pcm_ops mmp_pcm_ops = {
+ .open = mmp_pcm_open,
+ .close = mmp_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = mmp_pcm_hw_params,
+ .hw_free = mmp_pcm_hw_free,
+ .trigger = mmp_pcm_trigger,
+ .pointer = mmp_pcm_pointer,
+ .mmap = mmp_pcm_mmap,
+};
+
+static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+ struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+ size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
+ struct gen_pool *gpool;
+
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = pcm->card->dev;
+ buf->private_data = NULL;
+
+ gpool = sram_get_gpool("asram");
+ if (!gpool)
+ return -ENOMEM;
+
+ buf->area = (unsigned char *)gen_pool_alloc(gpool, size);
+ if (!buf->area)
+ return -ENOMEM;
+ buf->addr = gen_pool_virt_to_phys(gpool, (unsigned long)buf->area);
+ buf->bytes = size;
+ return 0;
+}
+
+static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream;
+ struct snd_dma_buffer *buf;
+ int stream;
+ struct gen_pool *gpool;
+
+ gpool = sram_get_gpool("asram");
+ if (!gpool)
+ return;
+
+ for (stream = 0; stream < 2; stream++) {
+ size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
+
+ substream = pcm->streams[stream].substream;
+ if (!substream)
+ continue;
+
+ buf = &substream->dma_buffer;
+ if (!buf->area)
+ continue;
+ gen_pool_free(gpool, (unsigned long)buf->area, size);
+ buf->area = NULL;
+ }
+
+ return;
+}
+
+static u64 mmp_pcm_dmamask = DMA_BIT_MASK(64);
+
+int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_card *card = rtd->card->snd_card;
+ struct snd_pcm *pcm = rtd->pcm;
+ int ret = 0;
+
+ if (!card->dev->dma_mask)
+ card->dev->dma_mask = &mmp_pcm_dmamask;
+
+ if (!card->dev->coherent_dma_mask)
+ card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
+
+ if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+ ret = mmp_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_PLAYBACK);
+ if (ret)
+ goto out;
+ }
+
+ if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+ ret = mmp_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_CAPTURE);
+ if (ret)
+ goto out;
+ }
+ out:
+ return ret;
+}
+
+struct snd_soc_platform_driver mmp_soc_platform = {
+ .ops = &mmp_pcm_ops,
+ .pcm_new = mmp_pcm_new,
+ .pcm_free = mmp_pcm_free_dma_buffers,
+};
+
+static __devinit int mmp_pcm_probe(struct platform_device *pdev)
+{
+ struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
+
+ if (pdata) {
+ mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
+ pdata->buffer_max_playback;
+ mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
+ pdata->period_max_playback;
+ mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
+ pdata->buffer_max_capture;
+ mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
+ pdata->period_max_capture;
+ }
+ return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
+}
+
+static int __devexit mmp_pcm_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_platform(&pdev->dev);
+ return 0;
+}
+
+static struct platform_driver mmp_pcm_driver = {
+ .driver = {
+ .name = "mmp-pcm-audio",
+ .owner = THIS_MODULE,
+ },
+
+ .probe = mmp_pcm_probe,
+ .remove = __devexit_p(mmp_pcm_remove),
+};
+
+module_platform_driver(mmp_pcm_driver);
+
+MODULE_AUTHOR("Leo Yan <leoy at marvell.com>");
+MODULE_DESCRIPTION("MMP Soc Audio DMA module");
+MODULE_LICENSE("GPL");
--
1.7.1
More information about the linux-arm-kernel
mailing list