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ASoC: tegra: Add tegra-pcm driver
This provides an ASoC platform driver that manages Tegra's APB DMA controller. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stephen Warren
Mark Brown
parent
f0d8af4f52
commit
7605eb5bc3
401
sound/soc/tegra/tegra_pcm.c
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401
sound/soc/tegra/tegra_pcm.c
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@ -0,0 +1,401 @@
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/*
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* tegra_pcm.c - Tegra PCM driver
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*
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* Author: Stephen Warren <swarren@nvidia.com>
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* Copyright (C) 2010 - NVIDIA, Inc.
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*
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* Based on code copyright/by:
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*
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* Copyright (c) 2009-2010, NVIDIA Corporation.
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* Scott Peterson <speterson@nvidia.com>
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* Vijay Mali <vmali@nvidia.com>
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*
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* Copyright (C) 2010 Google, Inc.
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* Iliyan Malchev <malchev@google.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <linux/slab.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 "tegra_pcm.h"
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static const struct snd_pcm_hardware tegra_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_INTERLEAVED,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.channels_min = 2,
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.channels_max = 2,
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.period_bytes_min = 1024,
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.period_bytes_max = PAGE_SIZE,
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.periods_min = 2,
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.periods_max = 8,
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.buffer_bytes_max = PAGE_SIZE * 8,
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.fifo_size = 4,
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};
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static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd)
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{
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struct snd_pcm_substream *substream = prtd->substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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struct tegra_dma_req *dma_req;
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unsigned long addr;
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dma_req = &prtd->dma_req[prtd->dma_req_idx];
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prtd->dma_req_idx = 1 - prtd->dma_req_idx;
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addr = buf->addr + prtd->dma_pos;
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prtd->dma_pos += dma_req->size;
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if (prtd->dma_pos >= prtd->dma_pos_end)
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prtd->dma_pos = 0;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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dma_req->source_addr = addr;
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else
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dma_req->dest_addr = addr;
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tegra_dma_enqueue_req(prtd->dma_chan, dma_req);
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}
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static void dma_complete_callback(struct tegra_dma_req *req)
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{
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struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
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struct snd_pcm_substream *substream = prtd->substream;
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struct snd_pcm_runtime *runtime = substream->runtime;
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spin_lock(&prtd->lock);
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if (!prtd->running) {
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spin_unlock(&prtd->lock);
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return;
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}
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if (++prtd->period_index >= runtime->periods)
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prtd->period_index = 0;
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tegra_pcm_queue_dma(prtd);
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spin_unlock(&prtd->lock);
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snd_pcm_period_elapsed(substream);
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}
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static void setup_dma_tx_request(struct tegra_dma_req *req,
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struct tegra_pcm_dma_params * dmap)
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{
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req->complete = dma_complete_callback;
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req->to_memory = false;
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req->dest_addr = dmap->addr;
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req->dest_wrap = dmap->wrap;
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req->source_bus_width = 32;
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req->source_wrap = 0;
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req->dest_bus_width = dmap->width;
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req->req_sel = dmap->req_sel;
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}
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static void setup_dma_rx_request(struct tegra_dma_req *req,
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struct tegra_pcm_dma_params * dmap)
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{
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req->complete = dma_complete_callback;
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req->to_memory = true;
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req->source_addr = dmap->addr;
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req->dest_wrap = 0;
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req->source_bus_width = dmap->width;
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req->source_wrap = dmap->wrap;
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req->dest_bus_width = 32;
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req->req_sel = dmap->req_sel;
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}
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static int tegra_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct tegra_runtime_data *prtd;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct tegra_pcm_dma_params * dmap;
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int ret = 0;
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prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
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if (prtd == NULL)
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return -ENOMEM;
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runtime->private_data = prtd;
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prtd->substream = substream;
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spin_lock_init(&prtd->lock);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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setup_dma_tx_request(&prtd->dma_req[0], dmap);
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setup_dma_tx_request(&prtd->dma_req[1], dmap);
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} else {
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dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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setup_dma_rx_request(&prtd->dma_req[0], dmap);
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setup_dma_rx_request(&prtd->dma_req[1], dmap);
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}
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prtd->dma_req[0].dev = prtd;
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prtd->dma_req[1].dev = prtd;
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prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
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if (IS_ERR(prtd->dma_chan)) {
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ret = PTR_ERR(prtd->dma_chan);
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goto err;
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}
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/* Set HW params now that initialization is complete */
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snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
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/* Ensure that buffer size is a multiple of period size */
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ret = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0)
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goto err;
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return 0;
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err:
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if (prtd->dma_chan) {
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tegra_dma_free_channel(prtd->dma_chan);
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}
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kfree(prtd);
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return ret;
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}
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static int tegra_pcm_close(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct tegra_runtime_data *prtd = runtime->private_data;
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tegra_dma_free_channel(prtd->dma_chan);
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kfree(prtd);
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return 0;
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}
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static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct tegra_runtime_data *prtd = runtime->private_data;
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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prtd->dma_req[0].size = params_period_bytes(params);
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prtd->dma_req[1].size = prtd->dma_req[0].size;
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return 0;
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}
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static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct tegra_runtime_data *prtd = runtime->private_data;
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unsigned long flags;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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prtd->dma_pos = 0;
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prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
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prtd->period_index = 0;
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prtd->dma_req_idx = 0;
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/* Fall-through */
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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spin_lock_irqsave(&prtd->lock, flags);
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prtd->running = 1;
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spin_unlock_irqrestore(&prtd->lock, flags);
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tegra_pcm_queue_dma(prtd);
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tegra_pcm_queue_dma(prtd);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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spin_lock_irqsave(&prtd->lock, flags);
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prtd->running = 0;
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spin_unlock_irqrestore(&prtd->lock, flags);
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tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
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tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct tegra_runtime_data *prtd = runtime->private_data;
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return prtd->period_index * runtime->period_size;
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}
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static int tegra_pcm_mmap(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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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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static struct snd_pcm_ops tegra_pcm_ops = {
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.open = tegra_pcm_open,
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.close = tegra_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = tegra_pcm_hw_params,
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.hw_free = tegra_pcm_hw_free,
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.trigger = tegra_pcm_trigger,
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.pointer = tegra_pcm_pointer,
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.mmap = tegra_pcm_mmap,
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};
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static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = tegra_pcm_hardware.buffer_bytes_max;
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buf->area = dma_alloc_writecombine(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area)
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return -ENOMEM;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->bytes = size;
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return 0;
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}
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static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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if (!buf->area)
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return;
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dma_free_writecombine(pcm->card->dev, buf->bytes,
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buf->area, buf->addr);
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buf->area = NULL;
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}
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static u64 tegra_dma_mask = DMA_BIT_MASK(32);
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static int tegra_pcm_new(struct snd_card *card,
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struct snd_soc_dai *dai, struct snd_pcm *pcm)
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{
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int ret = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &tegra_dma_mask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = 0xffffffff;
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if (dai->driver->playback.channels_min) {
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ret = tegra_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto err;
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}
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if (dai->driver->capture.channels_min) {
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ret = tegra_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto err_free_play;
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}
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return 0;
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err_free_play:
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tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
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err:
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return ret;
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}
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static void tegra_pcm_free(struct snd_pcm *pcm)
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{
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tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
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tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
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}
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struct snd_soc_platform_driver tegra_pcm_platform = {
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.ops = &tegra_pcm_ops,
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.pcm_new = tegra_pcm_new,
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.pcm_free = tegra_pcm_free,
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};
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static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform);
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}
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static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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}
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static struct platform_driver tegra_pcm_driver = {
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.driver = {
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.name = "tegra-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = tegra_pcm_platform_probe,
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.remove = __devexit_p(tegra_pcm_platform_remove),
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};
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static int __init snd_tegra_pcm_init(void)
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{
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return platform_driver_register(&tegra_pcm_driver);
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}
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module_init(snd_tegra_pcm_init);
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static void __exit snd_tegra_pcm_exit(void)
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{
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platform_driver_unregister(&tegra_pcm_driver);
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}
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module_exit(snd_tegra_pcm_exit);
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MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
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MODULE_DESCRIPTION("Tegra PCM ASoC driver");
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MODULE_LICENSE("GPL");
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55
sound/soc/tegra/tegra_pcm.h
Normal file
55
sound/soc/tegra/tegra_pcm.h
Normal file
@ -0,0 +1,55 @@
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/*
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* tegra_pcm.h - Definitions for Tegra PCM driver
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*
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* Author: Stephen Warren <swarren@nvidia.com>
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* Copyright (C) 2010 - NVIDIA, Inc.
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*
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* Based on code copyright/by:
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||||
*
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* Copyright (c) 2009-2010, NVIDIA Corporation.
|
||||
* Scott Peterson <speterson@nvidia.com>
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*
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||||
* Copyright (C) 2010 Google, Inc.
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||||
* Iliyan Malchev <malchev@google.com>
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*
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* 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.
|
||||
*
|
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* 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
|
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* 02110-1301 USA
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*
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*/
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#ifndef __TEGRA_PCM_H__
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#define __TEGRA_PCM_H__
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#include <mach/dma.h>
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struct tegra_pcm_dma_params {
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unsigned long addr;
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unsigned long wrap;
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unsigned long width;
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unsigned long req_sel;
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};
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struct tegra_runtime_data {
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struct snd_pcm_substream *substream;
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spinlock_t lock;
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int running;
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int dma_pos;
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int dma_pos_end;
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int period_index;
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int dma_req_idx;
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struct tegra_dma_req dma_req[2];
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struct tegra_dma_channel *dma_chan;
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};
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#endif
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