| /* |
| * tegra_pcm.c - Tegra PCM driver |
| * |
| * Author: Stephen Warren <swarren@nvidia.com> |
| * Copyright (C) 2010,2012 - NVIDIA, Inc. |
| * |
| * Based on code copyright/by: |
| * |
| * Copyright (c) 2009-2010, NVIDIA Corporation. |
| * Scott Peterson <speterson@nvidia.com> |
| * Vijay Mali <vmali@nvidia.com> |
| * |
| * Copyright (C) 2010 Google, Inc. |
| * Iliyan Malchev <malchev@google.com> |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| * 02110-1301 USA |
| * |
| */ |
| |
| #include <linux/dma-mapping.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| #include <sound/dmaengine_pcm.h> |
| |
| #include "tegra_pcm.h" |
| |
| static const struct snd_pcm_hardware tegra_pcm_hardware = { |
| .info = SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_PAUSE | |
| SNDRV_PCM_INFO_RESUME | |
| SNDRV_PCM_INFO_INTERLEAVED, |
| .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| .channels_min = 2, |
| .channels_max = 2, |
| .period_bytes_min = 1024, |
| .period_bytes_max = PAGE_SIZE, |
| .periods_min = 2, |
| .periods_max = 8, |
| .buffer_bytes_max = PAGE_SIZE * 8, |
| .fifo_size = 4, |
| }; |
| |
| static int tegra_pcm_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| struct device *dev = rtd->platform->dev; |
| int ret; |
| |
| /* Set HW params now that initialization is complete */ |
| snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware); |
| |
| ret = snd_dmaengine_pcm_open(substream, NULL, NULL); |
| if (ret) { |
| dev_err(dev, "dmaengine pcm open failed with err %d\n", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int tegra_pcm_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| struct device *dev = rtd->platform->dev; |
| struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); |
| struct tegra_pcm_dma_params *dmap; |
| struct dma_slave_config slave_config; |
| int ret; |
| |
| dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
| |
| ret = snd_hwparams_to_dma_slave_config(substream, params, |
| &slave_config); |
| if (ret) { |
| dev_err(dev, "hw params config failed with err %d\n", ret); |
| return ret; |
| } |
| |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
| slave_config.dst_addr = dmap->addr; |
| slave_config.dst_maxburst = 4; |
| } else { |
| slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
| slave_config.src_addr = dmap->addr; |
| slave_config.src_maxburst = 4; |
| } |
| slave_config.slave_id = dmap->req_sel; |
| |
| ret = dmaengine_slave_config(chan, &slave_config); |
| if (ret < 0) { |
| dev_err(dev, "dma slave config failed with err %d\n", ret); |
| return ret; |
| } |
| |
| snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| return 0; |
| } |
| |
| static int tegra_pcm_hw_free(struct snd_pcm_substream *substream) |
| { |
| snd_pcm_set_runtime_buffer(substream, NULL); |
| return 0; |
| } |
| |
| static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| { |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| case SNDRV_PCM_TRIGGER_RESUME: |
| case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| return snd_dmaengine_pcm_trigger(substream, |
| SNDRV_PCM_TRIGGER_START); |
| |
| case SNDRV_PCM_TRIGGER_STOP: |
| case SNDRV_PCM_TRIGGER_SUSPEND: |
| case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| return snd_dmaengine_pcm_trigger(substream, |
| SNDRV_PCM_TRIGGER_STOP); |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int tegra_pcm_mmap(struct snd_pcm_substream *substream, |
| struct vm_area_struct *vma) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| |
| return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| runtime->dma_area, |
| runtime->dma_addr, |
| runtime->dma_bytes); |
| } |
| |
| static struct snd_pcm_ops tegra_pcm_ops = { |
| .open = tegra_pcm_open, |
| .close = snd_dmaengine_pcm_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = tegra_pcm_hw_params, |
| .hw_free = tegra_pcm_hw_free, |
| .trigger = tegra_pcm_trigger, |
| .pointer = snd_dmaengine_pcm_pointer, |
| .mmap = tegra_pcm_mmap, |
| }; |
| |
| static int tegra_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 = tegra_pcm_hardware.buffer_bytes_max; |
| |
| buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| &buf->addr, GFP_KERNEL); |
| if (!buf->area) |
| return -ENOMEM; |
| |
| buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| buf->dev.dev = pcm->card->dev; |
| buf->private_data = NULL; |
| buf->bytes = size; |
| |
| return 0; |
| } |
| |
| static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| { |
| struct snd_pcm_substream *substream; |
| struct snd_dma_buffer *buf; |
| |
| substream = pcm->streams[stream].substream; |
| if (!substream) |
| return; |
| |
| buf = &substream->dma_buffer; |
| if (!buf->area) |
| return; |
| |
| dma_free_writecombine(pcm->card->dev, buf->bytes, |
| buf->area, buf->addr); |
| buf->area = NULL; |
| } |
| |
| static u64 tegra_dma_mask = DMA_BIT_MASK(32); |
| |
| static int tegra_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 = &tegra_dma_mask; |
| if (!card->dev->coherent_dma_mask) |
| card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| |
| if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
| ret = tegra_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_PLAYBACK); |
| if (ret) |
| goto err; |
| } |
| |
| if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
| ret = tegra_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_CAPTURE); |
| if (ret) |
| goto err_free_play; |
| } |
| |
| return 0; |
| |
| err_free_play: |
| tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); |
| err: |
| return ret; |
| } |
| |
| static void tegra_pcm_free(struct snd_pcm *pcm) |
| { |
| tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE); |
| tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); |
| } |
| |
| static struct snd_soc_platform_driver tegra_pcm_platform = { |
| .ops = &tegra_pcm_ops, |
| .pcm_new = tegra_pcm_new, |
| .pcm_free = tegra_pcm_free, |
| }; |
| |
| int tegra_pcm_platform_register(struct device *dev) |
| { |
| return snd_soc_register_platform(dev, &tegra_pcm_platform); |
| } |
| EXPORT_SYMBOL_GPL(tegra_pcm_platform_register); |
| |
| void tegra_pcm_platform_unregister(struct device *dev) |
| { |
| snd_soc_unregister_platform(dev); |
| } |
| EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister); |
| |
| MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); |
| MODULE_DESCRIPTION("Tegra PCM ASoC driver"); |
| MODULE_LICENSE("GPL"); |