268 lines
6.5 KiB
C
268 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* linux/sound/soc/pxa/mmp-pcm.c
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*
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* Copyright (C) 2011 Marvell International Ltd.
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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 <linux/dmaengine.h>
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#include <linux/platform_data/dma-mmp_tdma.h>
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#include <linux/platform_data/mmp_audio.h>
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#include <sound/pxa2xx-lib.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 <sound/dmaengine_pcm.h>
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#define DRV_NAME "mmp-pcm"
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struct mmp_dma_data {
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int ssp_id;
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struct resource *dma_res;
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};
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#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP | \
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SNDRV_PCM_INFO_MMAP_VALID | \
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SNDRV_PCM_INFO_INTERLEAVED | \
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SNDRV_PCM_INFO_PAUSE | \
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SNDRV_PCM_INFO_RESUME | \
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SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
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static struct snd_pcm_hardware mmp_pcm_hardware[] = {
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{
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.info = MMP_PCM_INFO,
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.period_bytes_min = 1024,
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.period_bytes_max = 2048,
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.periods_min = 2,
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.periods_max = 32,
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.buffer_bytes_max = 4096,
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.fifo_size = 32,
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},
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{
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.info = MMP_PCM_INFO,
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.period_bytes_min = 1024,
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.period_bytes_max = 2048,
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.periods_min = 2,
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.periods_max = 32,
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.buffer_bytes_max = 4096,
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.fifo_size = 32,
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},
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};
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static int mmp_pcm_hw_params(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
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struct dma_slave_config slave_config;
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int ret;
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ret =
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snd_dmaengine_pcm_prepare_slave_config(substream, params,
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&slave_config);
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if (ret)
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return ret;
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ret = dmaengine_slave_config(chan, &slave_config);
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if (ret)
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return ret;
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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return 0;
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}
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static int mmp_pcm_trigger(struct snd_soc_component *component,
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struct snd_pcm_substream *substream, int cmd)
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{
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return snd_dmaengine_pcm_trigger(substream, cmd);
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}
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static snd_pcm_uframes_t mmp_pcm_pointer(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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return snd_dmaengine_pcm_pointer(substream);
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}
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static bool filter(struct dma_chan *chan, void *param)
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{
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struct mmp_dma_data *dma_data = param;
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bool found = false;
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char *devname;
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devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
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dma_data->ssp_id);
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if (devname && (strcmp(dev_name(chan->device->dev), devname) == 0) &&
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(chan->chan_id == dma_data->dma_res->start)) {
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found = true;
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}
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kfree(devname);
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return found;
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}
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static int mmp_pcm_open(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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struct platform_device *pdev = to_platform_device(component->dev);
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struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
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struct mmp_dma_data dma_data;
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struct resource *r;
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r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
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if (!r)
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return -EBUSY;
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snd_soc_set_runtime_hwparams(substream,
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&mmp_pcm_hardware[substream->stream]);
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dma_data.dma_res = r;
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dma_data.ssp_id = cpu_dai->id;
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return snd_dmaengine_pcm_open_request_chan(substream, filter,
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&dma_data);
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}
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static int mmp_pcm_close(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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return snd_dmaengine_pcm_close_release_chan(substream);
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}
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static int mmp_pcm_mmap(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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unsigned long off = vma->vm_pgoff;
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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return remap_pfn_range(vma, vma->vm_start,
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__phys_to_pfn(runtime->dma_addr) + off,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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}
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static void mmp_pcm_free_dma_buffers(struct snd_soc_component *component,
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struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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struct gen_pool *gpool;
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gpool = sram_get_gpool("asram");
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if (!gpool)
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return;
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for (stream = 0; stream < 2; stream++) {
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size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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gen_pool_free(gpool, (unsigned long)buf->area, size);
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buf->area = NULL;
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}
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}
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static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
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int stream)
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{
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
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struct gen_pool *gpool;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = substream->pcm->card->dev;
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buf->private_data = NULL;
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gpool = sram_get_gpool("asram");
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if (!gpool)
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return -ENOMEM;
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buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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static int mmp_pcm_new(struct snd_soc_component *component,
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struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_pcm_substream *substream;
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struct snd_pcm *pcm = rtd->pcm;
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int ret, stream;
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
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if (ret)
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goto err;
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}
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return 0;
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err:
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mmp_pcm_free_dma_buffers(component, pcm);
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return ret;
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}
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static const struct snd_soc_component_driver mmp_soc_component = {
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.name = DRV_NAME,
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.open = mmp_pcm_open,
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.close = mmp_pcm_close,
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.hw_params = mmp_pcm_hw_params,
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.trigger = mmp_pcm_trigger,
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.pointer = mmp_pcm_pointer,
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.mmap = mmp_pcm_mmap,
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.pcm_construct = mmp_pcm_new,
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.pcm_destruct = mmp_pcm_free_dma_buffers,
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};
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static int mmp_pcm_probe(struct platform_device *pdev)
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{
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struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
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if (pdata) {
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mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
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pdata->buffer_max_playback;
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mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
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pdata->period_max_playback;
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mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
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pdata->buffer_max_capture;
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mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
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pdata->period_max_capture;
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}
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return devm_snd_soc_register_component(&pdev->dev, &mmp_soc_component,
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NULL, 0);
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}
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static struct platform_driver mmp_pcm_driver = {
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.driver = {
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.name = "mmp-pcm-audio",
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},
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.probe = mmp_pcm_probe,
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};
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module_platform_driver(mmp_pcm_driver);
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MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
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MODULE_DESCRIPTION("MMP Soc Audio DMA module");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:mmp-pcm-audio");
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