/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include struct mmp_dma_data { int ssp_id; struct resource *dma_res; }; #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 | \ SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) static struct snd_pcm_hardware mmp_pcm_hardware[] = { { .info = MMP_PCM_INFO, .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, .period_bytes_min = 1024, .period_bytes_max = 2048, .periods_min = 2, .periods_max = 32, .buffer_bytes_max = 4096, .fifo_size = 32, }, }; static int mmp_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); struct dma_slave_config slave_config; int ret; ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &slave_config); if (ret) return ret; ret = dmaengine_slave_config(chan, &slave_config); if (ret) return ret; snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); return 0; } static bool filter(struct dma_chan *chan, void *param) { struct mmp_dma_data *dma_data = param; bool found = false; char *devname; devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name, dma_data->ssp_id); if ((strcmp(dev_name(chan->device->dev), devname) == 0) && (chan->chan_id == dma_data->dma_res->start)) { found = true; } kfree(devname); return found; } 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_soc_dai *cpu_dai = rtd->cpu_dai; struct mmp_dma_data dma_data; struct resource *r; r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream); if (!r) return -EBUSY; snd_soc_set_runtime_hwparams(substream, &mmp_pcm_hardware[substream->stream]); dma_data.dma_res = r; dma_data.ssp_id = cpu_dai->id; return snd_dmaengine_pcm_open_request_chan(substream, filter, &dma_data); } 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); } static const struct snd_pcm_ops mmp_pcm_ops = { .open = mmp_pcm_open, .close = snd_dmaengine_pcm_close_release_chan, .ioctl = snd_pcm_lib_ioctl, .hw_params = mmp_pcm_hw_params, .trigger = snd_dmaengine_pcm_trigger, .pointer = snd_dmaengine_pcm_pointer, .mmap = mmp_pcm_mmap, }; 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; } } static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream, int stream) { 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 = substream->pcm->card->dev; buf->private_data = NULL; gpool = sram_get_gpool("asram"); if (!gpool) return -ENOMEM; buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr); if (!buf->area) return -ENOMEM; buf->bytes = size; return 0; } static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd) { struct snd_pcm_substream *substream; struct snd_pcm *pcm = rtd->pcm; int ret = 0, stream; for (stream = 0; stream < 2; stream++) { substream = pcm->streams[stream].substream; ret = mmp_pcm_preallocate_dma_buffer(substream, stream); if (ret) goto err; } return 0; err: mmp_pcm_free_dma_buffers(pcm); return ret; } static const 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 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 devm_snd_soc_register_platform(&pdev->dev, &mmp_soc_platform); } static struct platform_driver mmp_pcm_driver = { .driver = { .name = "mmp-pcm-audio", }, .probe = mmp_pcm_probe, }; module_platform_driver(mmp_pcm_driver); MODULE_AUTHOR("Leo Yan "); MODULE_DESCRIPTION("MMP Soc Audio DMA module"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:mmp-pcm-audio");