cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

omap-hdmi.c (10939B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
      4 *
      5 * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com
      6 *
      7 * Author: Jyri Sarha <jsarha@ti.com>
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include <linux/err.h>
     13#include <linux/string.h>
     14#include <linux/platform_device.h>
     15#include <sound/soc.h>
     16#include <sound/pcm_params.h>
     17#include <sound/dmaengine_pcm.h>
     18#include <uapi/sound/asound.h>
     19#include <sound/asoundef.h>
     20#include <sound/omap-hdmi-audio.h>
     21
     22#include "sdma-pcm.h"
     23
     24#define DRV_NAME "omap-hdmi-audio"
     25
     26struct hdmi_audio_data {
     27	struct snd_soc_card *card;
     28
     29	const struct omap_hdmi_audio_ops *ops;
     30	struct device *dssdev;
     31	struct snd_dmaengine_dai_dma_data dma_data;
     32	struct omap_dss_audio dss_audio;
     33	struct snd_aes_iec958 iec;
     34	struct snd_cea_861_aud_if cea;
     35
     36	struct mutex current_stream_lock;
     37	struct snd_pcm_substream *current_stream;
     38};
     39
     40static
     41struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
     42{
     43	struct snd_soc_pcm_runtime *rtd = ss->private_data;
     44
     45	return snd_soc_card_get_drvdata(rtd->card);
     46}
     47
     48static void hdmi_dai_abort(struct device *dev)
     49{
     50	struct hdmi_audio_data *ad = dev_get_drvdata(dev);
     51
     52	mutex_lock(&ad->current_stream_lock);
     53	if (ad->current_stream && ad->current_stream->runtime &&
     54	    snd_pcm_running(ad->current_stream)) {
     55		dev_err(dev, "HDMI display disabled, aborting playback\n");
     56		snd_pcm_stream_lock_irq(ad->current_stream);
     57		snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
     58		snd_pcm_stream_unlock_irq(ad->current_stream);
     59	}
     60	mutex_unlock(&ad->current_stream_lock);
     61}
     62
     63static int hdmi_dai_startup(struct snd_pcm_substream *substream,
     64			    struct snd_soc_dai *dai)
     65{
     66	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
     67	int ret;
     68	/*
     69	 * Make sure that the period bytes are multiple of the DMA packet size.
     70	 * Largest packet size we use is 32 32-bit words = 128 bytes
     71	 */
     72	ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
     73					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
     74	if (ret < 0) {
     75		dev_err(dai->dev, "Could not apply period constraint: %d\n",
     76			ret);
     77		return ret;
     78	}
     79	ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
     80					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
     81	if (ret < 0) {
     82		dev_err(dai->dev, "Could not apply buffer constraint: %d\n",
     83			ret);
     84		return ret;
     85	}
     86
     87	snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
     88
     89	mutex_lock(&ad->current_stream_lock);
     90	ad->current_stream = substream;
     91	mutex_unlock(&ad->current_stream_lock);
     92
     93	ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
     94
     95	if (ret) {
     96		mutex_lock(&ad->current_stream_lock);
     97		ad->current_stream = NULL;
     98		mutex_unlock(&ad->current_stream_lock);
     99	}
    100
    101	return ret;
    102}
    103
    104static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
    105			      struct snd_pcm_hw_params *params,
    106			      struct snd_soc_dai *dai)
    107{
    108	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
    109	struct snd_aes_iec958 *iec = &ad->iec;
    110	struct snd_cea_861_aud_if *cea = &ad->cea;
    111
    112	WARN_ON(ad->current_stream != substream);
    113
    114	switch (params_format(params)) {
    115	case SNDRV_PCM_FORMAT_S16_LE:
    116		ad->dma_data.maxburst = 16;
    117		break;
    118	case SNDRV_PCM_FORMAT_S24_LE:
    119		ad->dma_data.maxburst = 32;
    120		break;
    121	default:
    122		dev_err(dai->dev, "format not supported!\n");
    123		return -EINVAL;
    124	}
    125
    126	ad->dss_audio.iec = iec;
    127	ad->dss_audio.cea = cea;
    128	/*
    129	 * fill the IEC-60958 channel status word
    130	 */
    131	/* initialize the word bytes */
    132	memset(iec->status, 0, sizeof(iec->status));
    133
    134	/* specify IEC-60958-3 (commercial use) */
    135	iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
    136
    137	/* specify that the audio is LPCM*/
    138	iec->status[0] &= ~IEC958_AES0_NONAUDIO;
    139
    140	iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
    141
    142	iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
    143
    144	iec->status[1] = IEC958_AES1_CON_GENERAL;
    145
    146	iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
    147
    148	iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
    149
    150	switch (params_rate(params)) {
    151	case 32000:
    152		iec->status[3] |= IEC958_AES3_CON_FS_32000;
    153		break;
    154	case 44100:
    155		iec->status[3] |= IEC958_AES3_CON_FS_44100;
    156		break;
    157	case 48000:
    158		iec->status[3] |= IEC958_AES3_CON_FS_48000;
    159		break;
    160	case 88200:
    161		iec->status[3] |= IEC958_AES3_CON_FS_88200;
    162		break;
    163	case 96000:
    164		iec->status[3] |= IEC958_AES3_CON_FS_96000;
    165		break;
    166	case 176400:
    167		iec->status[3] |= IEC958_AES3_CON_FS_176400;
    168		break;
    169	case 192000:
    170		iec->status[3] |= IEC958_AES3_CON_FS_192000;
    171		break;
    172	default:
    173		dev_err(dai->dev, "rate not supported!\n");
    174		return -EINVAL;
    175	}
    176
    177	/* specify the clock accuracy */
    178	iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
    179
    180	/*
    181	 * specify the word length. The same word length value can mean
    182	 * two different lengths. Hence, we need to specify the maximum
    183	 * word length as well.
    184	 */
    185	switch (params_format(params)) {
    186	case SNDRV_PCM_FORMAT_S16_LE:
    187		iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
    188		iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
    189		break;
    190	case SNDRV_PCM_FORMAT_S24_LE:
    191		iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
    192		iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
    193		break;
    194	default:
    195		dev_err(dai->dev, "format not supported!\n");
    196		return -EINVAL;
    197	}
    198
    199	/*
    200	 * Fill the CEA-861 audio infoframe (see spec for details)
    201	 */
    202
    203	cea->db1_ct_cc = (params_channels(params) - 1)
    204		& CEA861_AUDIO_INFOFRAME_DB1CC;
    205	cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
    206
    207	cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
    208	cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
    209
    210	cea->db3 = 0; /* not used, all zeros */
    211
    212	if (params_channels(params) == 2)
    213		cea->db4_ca = 0x0;
    214	else if (params_channels(params) == 6)
    215		cea->db4_ca = 0xb;
    216	else
    217		cea->db4_ca = 0x13;
    218
    219	if (cea->db4_ca == 0x00)
    220		cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;
    221	else
    222		cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
    223
    224	/* the expression is trivial but makes clear what we are doing */
    225	cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
    226
    227	return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
    228}
    229
    230static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
    231			    struct snd_soc_dai *dai)
    232{
    233	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
    234	int err = 0;
    235
    236	WARN_ON(ad->current_stream != substream);
    237
    238	switch (cmd) {
    239	case SNDRV_PCM_TRIGGER_START:
    240	case SNDRV_PCM_TRIGGER_RESUME:
    241	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
    242		err = ad->ops->audio_start(ad->dssdev);
    243		break;
    244	case SNDRV_PCM_TRIGGER_STOP:
    245	case SNDRV_PCM_TRIGGER_SUSPEND:
    246	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
    247		ad->ops->audio_stop(ad->dssdev);
    248		break;
    249	default:
    250		err = -EINVAL;
    251	}
    252	return err;
    253}
    254
    255static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
    256			      struct snd_soc_dai *dai)
    257{
    258	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
    259
    260	WARN_ON(ad->current_stream != substream);
    261
    262	ad->ops->audio_shutdown(ad->dssdev);
    263
    264	mutex_lock(&ad->current_stream_lock);
    265	ad->current_stream = NULL;
    266	mutex_unlock(&ad->current_stream_lock);
    267}
    268
    269static const struct snd_soc_dai_ops hdmi_dai_ops = {
    270	.startup	= hdmi_dai_startup,
    271	.hw_params	= hdmi_dai_hw_params,
    272	.trigger	= hdmi_dai_trigger,
    273	.shutdown	= hdmi_dai_shutdown,
    274};
    275
    276static const struct snd_soc_component_driver omap_hdmi_component = {
    277	.name = "omapdss_hdmi",
    278};
    279
    280static struct snd_soc_dai_driver omap5_hdmi_dai = {
    281	.name = "omap5-hdmi-dai",
    282	.playback = {
    283		.channels_min = 2,
    284		.channels_max = 8,
    285		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
    286			  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
    287			  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
    288			  SNDRV_PCM_RATE_192000),
    289		.formats = SNDRV_PCM_FMTBIT_S16_LE,
    290	},
    291	.ops = &hdmi_dai_ops,
    292};
    293
    294static struct snd_soc_dai_driver omap4_hdmi_dai = {
    295	.name = "omap4-hdmi-dai",
    296	.playback = {
    297		.channels_min = 2,
    298		.channels_max = 8,
    299		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
    300			  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
    301			  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
    302			  SNDRV_PCM_RATE_192000),
    303		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
    304	},
    305	.ops = &hdmi_dai_ops,
    306};
    307
    308static int omap_hdmi_audio_probe(struct platform_device *pdev)
    309{
    310	struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
    311	struct device *dev = &pdev->dev;
    312	struct hdmi_audio_data *ad;
    313	struct snd_soc_dai_driver *dai_drv;
    314	struct snd_soc_card *card;
    315	struct snd_soc_dai_link_component *compnent;
    316	int ret;
    317
    318	if (!ha) {
    319		dev_err(dev, "No platform data\n");
    320		return -EINVAL;
    321	}
    322
    323	ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
    324	if (!ad)
    325		return -ENOMEM;
    326	ad->dssdev = ha->dev;
    327	ad->ops = ha->ops;
    328	ad->dma_data.addr = ha->audio_dma_addr;
    329	ad->dma_data.filter_data = "audio_tx";
    330	ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
    331	mutex_init(&ad->current_stream_lock);
    332
    333	switch (ha->version) {
    334	case 4:
    335		dai_drv = &omap4_hdmi_dai;
    336		break;
    337	case 5:
    338		dai_drv = &omap5_hdmi_dai;
    339		break;
    340	default:
    341		return -EINVAL;
    342	}
    343	ret = devm_snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
    344					 dai_drv, 1);
    345	if (ret)
    346		return ret;
    347
    348	ret = sdma_pcm_platform_register(ad->dssdev, "audio_tx", NULL);
    349	if (ret)
    350		return ret;
    351
    352	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
    353	if (!card)
    354		return -ENOMEM;
    355
    356	card->name = devm_kasprintf(dev, GFP_KERNEL,
    357				    "HDMI %s", dev_name(ad->dssdev));
    358	if (!card->name)
    359		return -ENOMEM;
    360
    361	card->owner = THIS_MODULE;
    362	card->dai_link =
    363		devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
    364	if (!card->dai_link)
    365		return -ENOMEM;
    366
    367	compnent = devm_kzalloc(dev, 3 * sizeof(*compnent), GFP_KERNEL);
    368	if (!compnent)
    369		return -ENOMEM;
    370	card->dai_link->cpus		= &compnent[0];
    371	card->dai_link->num_cpus	= 1;
    372	card->dai_link->codecs		= &compnent[1];
    373	card->dai_link->num_codecs	= 1;
    374	card->dai_link->platforms	= &compnent[2];
    375	card->dai_link->num_platforms	= 1;
    376
    377	card->dai_link->name = card->name;
    378	card->dai_link->stream_name = card->name;
    379	card->dai_link->cpus->dai_name = dev_name(ad->dssdev);
    380	card->dai_link->platforms->name = dev_name(ad->dssdev);
    381	card->dai_link->codecs->name = "snd-soc-dummy";
    382	card->dai_link->codecs->dai_name = "snd-soc-dummy-dai";
    383	card->num_links = 1;
    384	card->dev = dev;
    385
    386	ret = snd_soc_register_card(card);
    387	if (ret) {
    388		dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
    389		return ret;
    390	}
    391
    392	ad->card = card;
    393	snd_soc_card_set_drvdata(card, ad);
    394
    395	dev_set_drvdata(dev, ad);
    396
    397	return 0;
    398}
    399
    400static int omap_hdmi_audio_remove(struct platform_device *pdev)
    401{
    402	struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
    403
    404	snd_soc_unregister_card(ad->card);
    405	return 0;
    406}
    407
    408static struct platform_driver hdmi_audio_driver = {
    409	.driver = {
    410		.name = DRV_NAME,
    411	},
    412	.probe = omap_hdmi_audio_probe,
    413	.remove = omap_hdmi_audio_remove,
    414};
    415
    416module_platform_driver(hdmi_audio_driver);
    417
    418MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
    419MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
    420MODULE_LICENSE("GPL");
    421MODULE_ALIAS("platform:" DRV_NAME);