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421 lines
11 KiB
421 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library |
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* |
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* Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com |
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* |
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* Author: Jyri Sarha <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/err.h> |
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#include <linux/string.h> |
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#include <linux/platform_device.h> |
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#include <sound/soc.h> |
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#include <sound/pcm_params.h> |
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#include <sound/dmaengine_pcm.h> |
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#include <uapi/sound/asound.h> |
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#include <sound/asoundef.h> |
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#include <sound/omap-hdmi-audio.h> |
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#include "sdma-pcm.h" |
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#define DRV_NAME "omap-hdmi-audio" |
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struct hdmi_audio_data { |
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struct snd_soc_card *card; |
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const struct omap_hdmi_audio_ops *ops; |
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struct device *dssdev; |
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struct snd_dmaengine_dai_dma_data dma_data; |
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struct omap_dss_audio dss_audio; |
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struct snd_aes_iec958 iec; |
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struct snd_cea_861_aud_if cea; |
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struct mutex current_stream_lock; |
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struct snd_pcm_substream *current_stream; |
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}; |
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static |
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struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss) |
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{ |
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struct snd_soc_pcm_runtime *rtd = ss->private_data; |
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return snd_soc_card_get_drvdata(rtd->card); |
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} |
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static void hdmi_dai_abort(struct device *dev) |
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{ |
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struct hdmi_audio_data *ad = dev_get_drvdata(dev); |
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mutex_lock(&ad->current_stream_lock); |
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if (ad->current_stream && ad->current_stream->runtime && |
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snd_pcm_running(ad->current_stream)) { |
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dev_err(dev, "HDMI display disabled, aborting playback\n"); |
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snd_pcm_stream_lock_irq(ad->current_stream); |
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snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED); |
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snd_pcm_stream_unlock_irq(ad->current_stream); |
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} |
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mutex_unlock(&ad->current_stream_lock); |
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} |
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static int hdmi_dai_startup(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct hdmi_audio_data *ad = card_drvdata_substream(substream); |
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int ret; |
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/* |
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* Make sure that the period bytes are multiple of the DMA packet size. |
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* Largest packet size we use is 32 32-bit words = 128 bytes |
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*/ |
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ret = snd_pcm_hw_constraint_step(substream->runtime, 0, |
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128); |
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if (ret < 0) { |
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dev_err(dai->dev, "Could not apply period constraint: %d\n", |
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ret); |
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return ret; |
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} |
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ret = snd_pcm_hw_constraint_step(substream->runtime, 0, |
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SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128); |
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if (ret < 0) { |
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dev_err(dai->dev, "Could not apply buffer constraint: %d\n", |
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ret); |
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return ret; |
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} |
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snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data); |
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mutex_lock(&ad->current_stream_lock); |
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ad->current_stream = substream; |
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mutex_unlock(&ad->current_stream_lock); |
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ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort); |
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if (ret) { |
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mutex_lock(&ad->current_stream_lock); |
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ad->current_stream = NULL; |
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mutex_unlock(&ad->current_stream_lock); |
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} |
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return ret; |
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} |
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static int hdmi_dai_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct snd_soc_dai *dai) |
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{ |
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struct hdmi_audio_data *ad = card_drvdata_substream(substream); |
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struct snd_aes_iec958 *iec = &ad->iec; |
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struct snd_cea_861_aud_if *cea = &ad->cea; |
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WARN_ON(ad->current_stream != substream); |
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switch (params_format(params)) { |
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case SNDRV_PCM_FORMAT_S16_LE: |
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ad->dma_data.maxburst = 16; |
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break; |
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case SNDRV_PCM_FORMAT_S24_LE: |
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ad->dma_data.maxburst = 32; |
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break; |
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default: |
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dev_err(dai->dev, "format not supported!\n"); |
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return -EINVAL; |
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} |
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ad->dss_audio.iec = iec; |
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ad->dss_audio.cea = cea; |
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/* |
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* fill the IEC-60958 channel status word |
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*/ |
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/* initialize the word bytes */ |
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memset(iec->status, 0, sizeof(iec->status)); |
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/* specify IEC-60958-3 (commercial use) */ |
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iec->status[0] &= ~IEC958_AES0_PROFESSIONAL; |
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/* specify that the audio is LPCM*/ |
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iec->status[0] &= ~IEC958_AES0_NONAUDIO; |
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iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT; |
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iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE; |
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iec->status[1] = IEC958_AES1_CON_GENERAL; |
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iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC; |
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iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC; |
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switch (params_rate(params)) { |
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case 32000: |
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iec->status[3] |= IEC958_AES3_CON_FS_32000; |
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break; |
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case 44100: |
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iec->status[3] |= IEC958_AES3_CON_FS_44100; |
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break; |
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case 48000: |
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iec->status[3] |= IEC958_AES3_CON_FS_48000; |
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break; |
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case 88200: |
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iec->status[3] |= IEC958_AES3_CON_FS_88200; |
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break; |
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case 96000: |
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iec->status[3] |= IEC958_AES3_CON_FS_96000; |
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break; |
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case 176400: |
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iec->status[3] |= IEC958_AES3_CON_FS_176400; |
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break; |
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case 192000: |
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iec->status[3] |= IEC958_AES3_CON_FS_192000; |
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break; |
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default: |
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dev_err(dai->dev, "rate not supported!\n"); |
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return -EINVAL; |
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} |
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/* specify the clock accuracy */ |
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iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM; |
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/* |
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* specify the word length. The same word length value can mean |
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* two different lengths. Hence, we need to specify the maximum |
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* word length as well. |
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*/ |
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switch (params_format(params)) { |
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case SNDRV_PCM_FORMAT_S16_LE: |
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iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16; |
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iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24; |
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break; |
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case SNDRV_PCM_FORMAT_S24_LE: |
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iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20; |
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iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24; |
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break; |
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default: |
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dev_err(dai->dev, "format not supported!\n"); |
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return -EINVAL; |
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} |
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/* |
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* Fill the CEA-861 audio infoframe (see spec for details) |
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*/ |
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cea->db1_ct_cc = (params_channels(params) - 1) |
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& CEA861_AUDIO_INFOFRAME_DB1CC; |
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cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM; |
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cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM; |
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cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM; |
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cea->db3 = 0; /* not used, all zeros */ |
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if (params_channels(params) == 2) |
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cea->db4_ca = 0x0; |
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else if (params_channels(params) == 6) |
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cea->db4_ca = 0xb; |
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else |
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cea->db4_ca = 0x13; |
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if (cea->db4_ca == 0x00) |
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cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED; |
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else |
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cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED; |
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/* the expression is trivial but makes clear what we are doing */ |
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cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV); |
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return ad->ops->audio_config(ad->dssdev, &ad->dss_audio); |
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} |
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static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd, |
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struct snd_soc_dai *dai) |
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{ |
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struct hdmi_audio_data *ad = card_drvdata_substream(substream); |
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int err = 0; |
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WARN_ON(ad->current_stream != substream); |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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err = ad->ops->audio_start(ad->dssdev); |
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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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ad->ops->audio_stop(ad->dssdev); |
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break; |
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default: |
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err = -EINVAL; |
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} |
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return err; |
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} |
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static void hdmi_dai_shutdown(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct hdmi_audio_data *ad = card_drvdata_substream(substream); |
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WARN_ON(ad->current_stream != substream); |
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ad->ops->audio_shutdown(ad->dssdev); |
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mutex_lock(&ad->current_stream_lock); |
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ad->current_stream = NULL; |
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mutex_unlock(&ad->current_stream_lock); |
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} |
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static const struct snd_soc_dai_ops hdmi_dai_ops = { |
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.startup = hdmi_dai_startup, |
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.hw_params = hdmi_dai_hw_params, |
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.trigger = hdmi_dai_trigger, |
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.shutdown = hdmi_dai_shutdown, |
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}; |
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static const struct snd_soc_component_driver omap_hdmi_component = { |
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.name = "omapdss_hdmi", |
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}; |
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static struct snd_soc_dai_driver omap5_hdmi_dai = { |
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.name = "omap5-hdmi-dai", |
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.playback = { |
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.channels_min = 2, |
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.channels_max = 8, |
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.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | |
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SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | |
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SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | |
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SNDRV_PCM_RATE_192000), |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, |
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}, |
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.ops = &hdmi_dai_ops, |
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}; |
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static struct snd_soc_dai_driver omap4_hdmi_dai = { |
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.name = "omap4-hdmi-dai", |
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.playback = { |
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.channels_min = 2, |
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.channels_max = 8, |
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.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | |
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SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | |
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SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | |
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SNDRV_PCM_RATE_192000), |
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.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE, |
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}, |
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.ops = &hdmi_dai_ops, |
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}; |
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static int omap_hdmi_audio_probe(struct platform_device *pdev) |
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{ |
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struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data; |
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struct device *dev = &pdev->dev; |
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struct hdmi_audio_data *ad; |
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struct snd_soc_dai_driver *dai_drv; |
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struct snd_soc_card *card; |
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struct snd_soc_dai_link_component *compnent; |
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int ret; |
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if (!ha) { |
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dev_err(dev, "No platform data\n"); |
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return -EINVAL; |
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} |
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ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL); |
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if (!ad) |
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return -ENOMEM; |
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ad->dssdev = ha->dev; |
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ad->ops = ha->ops; |
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ad->dma_data.addr = ha->audio_dma_addr; |
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ad->dma_data.filter_data = "audio_tx"; |
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ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
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mutex_init(&ad->current_stream_lock); |
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switch (ha->version) { |
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case 4: |
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dai_drv = &omap4_hdmi_dai; |
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break; |
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case 5: |
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dai_drv = &omap5_hdmi_dai; |
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break; |
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default: |
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return -EINVAL; |
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} |
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ret = devm_snd_soc_register_component(ad->dssdev, &omap_hdmi_component, |
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dai_drv, 1); |
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if (ret) |
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return ret; |
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ret = sdma_pcm_platform_register(ad->dssdev, "audio_tx", NULL); |
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if (ret) |
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return ret; |
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card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL); |
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if (!card) |
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return -ENOMEM; |
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card->name = devm_kasprintf(dev, GFP_KERNEL, |
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"HDMI %s", dev_name(ad->dssdev)); |
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if (!card->name) |
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return -ENOMEM; |
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card->owner = THIS_MODULE; |
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card->dai_link = |
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devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL); |
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if (!card->dai_link) |
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return -ENOMEM; |
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compnent = devm_kzalloc(dev, 3 * sizeof(*compnent), GFP_KERNEL); |
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if (!compnent) |
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return -ENOMEM; |
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card->dai_link->cpus = &compnent[0]; |
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card->dai_link->num_cpus = 1; |
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card->dai_link->codecs = &compnent[1]; |
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card->dai_link->num_codecs = 1; |
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card->dai_link->platforms = &compnent[2]; |
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card->dai_link->num_platforms = 1; |
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card->dai_link->name = card->name; |
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card->dai_link->stream_name = card->name; |
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card->dai_link->cpus->dai_name = dev_name(ad->dssdev); |
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card->dai_link->platforms->name = dev_name(ad->dssdev); |
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card->dai_link->codecs->name = "snd-soc-dummy"; |
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card->dai_link->codecs->dai_name = "snd-soc-dummy-dai"; |
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card->num_links = 1; |
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card->dev = dev; |
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ret = snd_soc_register_card(card); |
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if (ret) { |
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dev_err(dev, "snd_soc_register_card failed (%d)\n", ret); |
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return ret; |
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} |
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ad->card = card; |
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snd_soc_card_set_drvdata(card, ad); |
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dev_set_drvdata(dev, ad); |
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return 0; |
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} |
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static int omap_hdmi_audio_remove(struct platform_device *pdev) |
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{ |
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struct hdmi_audio_data *ad = platform_get_drvdata(pdev); |
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snd_soc_unregister_card(ad->card); |
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return 0; |
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} |
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static struct platform_driver hdmi_audio_driver = { |
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.driver = { |
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.name = DRV_NAME, |
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}, |
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.probe = omap_hdmi_audio_probe, |
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.remove = omap_hdmi_audio_remove, |
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}; |
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module_platform_driver(hdmi_audio_driver); |
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MODULE_AUTHOR("Jyri Sarha <[email protected]>"); |
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MODULE_DESCRIPTION("OMAP HDMI Audio Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:" DRV_NAME);
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