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path: root/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
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Diffstat (limited to 'drivers/gpu/drm/xlnx/zynqmp_dp_audio.c')
-rw-r--r--drivers/gpu/drm/xlnx/zynqmp_dp_audio.c448
1 files changed, 448 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c b/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
new file mode 100644
index 000000000000..1a46a046103f
--- /dev/null
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
@@ -0,0 +1,448 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZynqMP DisplayPort Subsystem Driver - Audio support
+ *
+ * Copyright (C) 2015 - 2024 Xilinx, Inc.
+ *
+ * Authors:
+ * - Hyun Woo Kwon <hyun.kwon@xilinx.com>
+ * - Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
+
+#include <sound/asoundef.h>
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+#include "zynqmp_disp_regs.h"
+#include "zynqmp_dp.h"
+#include "zynqmp_dpsub.h"
+
+#define ZYNQMP_DISP_AUD_SMPL_RATE_TO_CLK 512
+#define ZYNQMP_NUM_PCMS 2
+
+struct zynqmp_dpsub_audio {
+ void __iomem *base;
+
+ struct snd_soc_card card;
+
+ const char *dai_name;
+ const char *link_names[ZYNQMP_NUM_PCMS];
+ const char *pcm_names[ZYNQMP_NUM_PCMS];
+
+ struct snd_soc_dai_driver dai_driver;
+ struct snd_dmaengine_pcm_config pcm_configs[2];
+
+ struct snd_soc_dai_link links[ZYNQMP_NUM_PCMS];
+
+ struct {
+ struct snd_soc_dai_link_component cpu;
+ struct snd_soc_dai_link_component platform;
+ } components[ZYNQMP_NUM_PCMS];
+
+ /*
+ * Protects:
+ * - enabled_streams
+ * - volumes
+ * - current_rate
+ */
+ struct mutex enable_lock;
+
+ u32 enabled_streams;
+ u32 current_rate;
+
+ u16 volumes[2];
+};
+
+static const struct snd_pcm_hardware zynqmp_dp_pcm_hw = {
+ .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,
+
+ .buffer_bytes_max = 128 * 1024,
+ .period_bytes_min = 256,
+ .period_bytes_max = 1024 * 1024,
+ .periods_min = 2,
+ .periods_max = 256,
+};
+
+static int zynqmp_dp_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
+ 256);
+
+ return 0;
+}
+
+static const struct snd_soc_ops zynqmp_dp_ops = {
+ .startup = zynqmp_dp_startup,
+};
+
+static void zynqmp_dp_audio_write(struct zynqmp_dpsub_audio *audio, int reg,
+ u32 val)
+{
+ writel(val, audio->base + reg);
+}
+
+static int dp_dai_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *socdai)
+{
+ struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
+ struct zynqmp_dpsub *dpsub =
+ snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
+ struct zynqmp_dpsub_audio *audio = dpsub->audio;
+ int ret;
+ u32 sample_rate;
+ struct snd_aes_iec958 iec = { 0 };
+ unsigned long rate;
+
+ sample_rate = params_rate(params);
+
+ if (sample_rate != 48000 && sample_rate != 44100)
+ return -EINVAL;
+
+ guard(mutex)(&audio->enable_lock);
+
+ if (audio->enabled_streams && audio->current_rate != sample_rate) {
+ dev_err(dpsub->dev,
+ "Can't change rate while playback enabled\n");
+ return -EINVAL;
+ }
+
+ if (audio->enabled_streams > 0) {
+ /* Nothing to do */
+ audio->enabled_streams++;
+ return 0;
+ }
+
+ audio->current_rate = sample_rate;
+
+ /* Note: clock rate can only be changed if the clock is disabled */
+ ret = clk_set_rate(dpsub->aud_clk,
+ sample_rate * ZYNQMP_DISP_AUD_SMPL_RATE_TO_CLK);
+ if (ret) {
+ dev_err(dpsub->dev, "can't set aud_clk to %u err:%d\n",
+ sample_rate * ZYNQMP_DISP_AUD_SMPL_RATE_TO_CLK, ret);
+ return ret;
+ }
+
+ clk_prepare_enable(dpsub->aud_clk);
+
+ rate = clk_get_rate(dpsub->aud_clk);
+
+ /* Ignore some offset +- 10 */
+ if (abs(sample_rate * ZYNQMP_DISP_AUD_SMPL_RATE_TO_CLK - rate) > 10) {
+ dev_err(dpsub->dev, "aud_clk offset is higher: %ld\n",
+ sample_rate * ZYNQMP_DISP_AUD_SMPL_RATE_TO_CLK - rate);
+ clk_disable_unprepare(dpsub->aud_clk);
+ return -EINVAL;
+ }
+
+ pm_runtime_get_sync(dpsub->dev);
+
+ zynqmp_dp_audio_write(audio, ZYNQMP_DISP_AUD_MIXER_VOLUME,
+ audio->volumes[0] | (audio->volumes[1] << 16));
+
+ /* Clear the audio soft reset register as it's an non-reset flop. */
+ zynqmp_dp_audio_write(audio, ZYNQMP_DISP_AUD_SOFT_RESET, 0);
+
+ /* Only 2 channel audio is supported now */
+ zynqmp_dp_audio_set_channels(dpsub->dp, 2);
+
+ zynqmp_dp_audio_write_n_m(dpsub->dp);
+
+ /* Channel status */
+
+ if (sample_rate == 48000)
+ iec.status[3] = IEC958_AES3_CON_FS_48000;
+ else
+ iec.status[3] = IEC958_AES3_CON_FS_44100;
+
+ for (unsigned int i = 0; i < AES_IEC958_STATUS_SIZE / 4; ++i) {
+ u32 v;
+
+ v = (iec.status[(i * 4) + 0] << 0) |
+ (iec.status[(i * 4) + 1] << 8) |
+ (iec.status[(i * 4) + 2] << 16) |
+ (iec.status[(i * 4) + 3] << 24);
+
+ zynqmp_dp_audio_write(audio, ZYNQMP_DISP_AUD_CH_STATUS(i), v);
+ }
+
+ zynqmp_dp_audio_enable(dpsub->dp);
+
+ audio->enabled_streams++;
+
+ return 0;
+}
+
+static int dp_dai_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *socdai)
+{
+ struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
+ struct zynqmp_dpsub *dpsub =
+ snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
+ struct zynqmp_dpsub_audio *audio = dpsub->audio;
+
+ guard(mutex)(&audio->enable_lock);
+
+ /* Nothing to do */
+ if (audio->enabled_streams > 1) {
+ audio->enabled_streams--;
+ return 0;
+ }
+
+ pm_runtime_put(dpsub->dev);
+
+ zynqmp_dp_audio_disable(dpsub->dp);
+
+ /*
+ * Reset doesn't work. If we assert reset between audio stop and start,
+ * the audio won't start anymore. Probably we are missing writing
+ * some audio related registers. A/B buf?
+ */
+ /*
+ zynqmp_disp_audio_write(audio, ZYNQMP_DISP_AUD_SOFT_RESET,
+ ZYNQMP_DISP_AUD_SOFT_RESET_AUD_SRST);
+ */
+
+ clk_disable_unprepare(dpsub->aud_clk);
+
+ audio->current_rate = 0;
+ audio->enabled_streams--;
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops zynqmp_dp_dai_ops = {
+ .hw_params = dp_dai_hw_params,
+ .hw_free = dp_dai_hw_free,
+};
+
+/*
+ * Min = 10 * log10(0x1 / 0x2000) = -39.13
+ * Max = 10 * log10(0xffffff / 0x2000) = 9.03
+ */
+static const DECLARE_TLV_DB_RANGE(zynqmp_dp_tlv,
+ 0x0, 0x0, TLV_DB_SCALE_ITEM(TLV_DB_GAIN_MUTE, -3913, 1),
+ 0x1, 0x2000, TLV_DB_LINEAR_ITEM(-3913, 0),
+ 0x2000, 0xffff, TLV_DB_LINEAR_ITEM(0, 903),
+);
+
+static const struct snd_kcontrol_new zynqmp_dp_snd_controls[] = {
+ SOC_SINGLE_TLV("Input0 Playback Volume", 0,
+ 0, 0xffff, 0, zynqmp_dp_tlv),
+ SOC_SINGLE_TLV("Input1 Playback Volume", 1,
+ 0, 0xffff, 0, zynqmp_dp_tlv),
+};
+
+/*
+ * Note: these read & write functions only support two "registers", 0 and 1,
+ * for volume 0 and 1. In other words, these are not real register read/write
+ * functions.
+ *
+ * This is done to support caching the volume value for the case where the
+ * hardware is not enabled, and also to support locking as volumes 0 and 1
+ * are in the same register.
+ */
+static unsigned int zynqmp_dp_dai_read(struct snd_soc_component *component,
+ unsigned int reg)
+{
+ struct zynqmp_dpsub *dpsub = dev_get_drvdata(component->dev);
+ struct zynqmp_dpsub_audio *audio = dpsub->audio;
+
+ return audio->volumes[reg];
+}
+
+static int zynqmp_dp_dai_write(struct snd_soc_component *component,
+ unsigned int reg, unsigned int val)
+{
+ struct zynqmp_dpsub *dpsub = dev_get_drvdata(component->dev);
+ struct zynqmp_dpsub_audio *audio = dpsub->audio;
+
+ guard(mutex)(&audio->enable_lock);
+
+ audio->volumes[reg] = val;
+
+ if (audio->enabled_streams)
+ zynqmp_dp_audio_write(audio, ZYNQMP_DISP_AUD_MIXER_VOLUME,
+ audio->volumes[0] |
+ (audio->volumes[1] << 16));
+
+ return 0;
+}
+
+static const struct snd_soc_component_driver zynqmp_dp_component_driver = {
+ .idle_bias_on = 1,
+ .use_pmdown_time = 1,
+ .endianness = 1,
+ .controls = zynqmp_dp_snd_controls,
+ .num_controls = ARRAY_SIZE(zynqmp_dp_snd_controls),
+ .read = zynqmp_dp_dai_read,
+ .write = zynqmp_dp_dai_write,
+};
+
+int zynqmp_audio_init(struct zynqmp_dpsub *dpsub)
+{
+ struct platform_device *pdev = to_platform_device(dpsub->dev);
+ struct device *dev = dpsub->dev;
+ struct zynqmp_dpsub_audio *audio;
+ struct snd_soc_card *card;
+ void *dev_data;
+ int ret;
+
+ if (!dpsub->aud_clk)
+ return 0;
+
+ audio = devm_kzalloc(dev, sizeof(*audio), GFP_KERNEL);
+ if (!audio)
+ return -ENOMEM;
+
+ dpsub->audio = audio;
+
+ mutex_init(&audio->enable_lock);
+
+ /* 0x2000 is the zero level, no change */
+ audio->volumes[0] = 0x2000;
+ audio->volumes[1] = 0x2000;
+
+ audio->dai_name = devm_kasprintf(dev, GFP_KERNEL,
+ "%s-dai", dev_name(dev));
+ if (!audio->dai_name)
+ return -ENOMEM;
+
+ for (unsigned int i = 0; i < ZYNQMP_NUM_PCMS; ++i) {
+ audio->link_names[i] = devm_kasprintf(dev, GFP_KERNEL,
+ "%s-dp-%u", dev_name(dev), i);
+ audio->pcm_names[i] = devm_kasprintf(dev, GFP_KERNEL,
+ "%s-pcm-%u", dev_name(dev), i);
+ if (!audio->link_names[i] || !audio->pcm_names[i])
+ return -ENOMEM;
+ }
+
+ audio->base = devm_platform_ioremap_resource_byname(pdev, "aud");
+ if (IS_ERR(audio->base))
+ return PTR_ERR(audio->base);
+
+ /* Create CPU DAI */
+
+ audio->dai_driver = (struct snd_soc_dai_driver) {
+ .name = audio->dai_name,
+ .ops = &zynqmp_dp_dai_ops,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ };
+
+ ret = devm_snd_soc_register_component(dev, &zynqmp_dp_component_driver,
+ &audio->dai_driver, 1);
+ if (ret) {
+ dev_err(dev, "Failed to register CPU DAI\n");
+ return ret;
+ }
+
+ /* Create PCMs */
+
+ for (unsigned int i = 0; i < ZYNQMP_NUM_PCMS; ++i) {
+ struct snd_dmaengine_pcm_config *pcm_config =
+ &audio->pcm_configs[i];
+
+ *pcm_config = (struct snd_dmaengine_pcm_config){
+ .name = audio->pcm_names[i],
+ .pcm_hardware = &zynqmp_dp_pcm_hw,
+ .prealloc_buffer_size = 64 * 1024,
+ .chan_names[SNDRV_PCM_STREAM_PLAYBACK] =
+ i == 0 ? "aud0" : "aud1",
+ };
+
+ ret = devm_snd_dmaengine_pcm_register(dev, pcm_config, 0);
+ if (ret) {
+ dev_err(dev, "Failed to register PCM %u\n", i);
+ return ret;
+ }
+ }
+
+ /* Create card */
+
+ card = &audio->card;
+ card->name = "DisplayPort";
+ card->long_name = "DisplayPort Monitor";
+ card->driver_name = "zynqmp_dpsub";
+ card->dev = dev;
+ card->owner = THIS_MODULE;
+ card->num_links = ZYNQMP_NUM_PCMS;
+ card->dai_link = audio->links;
+
+ for (unsigned int i = 0; i < ZYNQMP_NUM_PCMS; ++i) {
+ struct snd_soc_dai_link *link = &card->dai_link[i];
+
+ link->ops = &zynqmp_dp_ops;
+
+ link->name = audio->link_names[i];
+ link->stream_name = audio->link_names[i];
+
+ link->cpus = &audio->components[i].cpu;
+ link->num_cpus = 1;
+ link->cpus[0].dai_name = audio->dai_name;
+
+ link->codecs = &snd_soc_dummy_dlc;
+ link->num_codecs = 1;
+
+ link->platforms = &audio->components[i].platform;
+ link->num_platforms = 1;
+ link->platforms[0].name = audio->pcm_names[i];
+ }
+
+ /*
+ * HACK: devm_snd_soc_register_card() overwrites current drvdata
+ * so we need to hack it back.
+ */
+ dev_data = dev_get_drvdata(dev);
+ ret = devm_snd_soc_register_card(dev, card);
+ dev_set_drvdata(dev, dev_data);
+ if (ret) {
+ /*
+ * As older dtbs may not have the audio channel dmas defined,
+ * instead of returning an error here we'll continue and just
+ * mark the audio as disabled.
+ */
+ dev_err(dev, "Failed to register sound card, disabling audio support\n");
+
+ devm_kfree(dev, audio);
+ dpsub->audio = NULL;
+
+ return 0;
+ }
+
+ return 0;
+}
+
+void zynqmp_audio_uninit(struct zynqmp_dpsub *dpsub)
+{
+ struct zynqmp_dpsub_audio *audio = dpsub->audio;
+
+ if (!audio)
+ return;
+
+ if (!dpsub->aud_clk)
+ return;
+
+ mutex_destroy(&audio->enable_lock);
+}
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-28 04:28:20 +0300