// SPDX-License-Identifier: GPL-2.0 /* * dw-hdmi-i2s-audio.c * * Copyright (c) 2017 Renesas Solutions Corp. * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> */ #include <linux/dma-mapping.h> #include <linux/module.h> #include <drm/bridge/dw_hdmi.h> #include <drm/drm_crtc.h> #include <sound/hdmi-codec.h> #include "dw-hdmi.h" #include "dw-hdmi-audio.h" #define DRIVER_NAME "dw-hdmi-i2s-audio" static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio, u8 val, int offset) { struct dw_hdmi *hdmi = audio->hdmi; audio->write(hdmi, val, offset); } static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset) { struct dw_hdmi *hdmi = audio->hdmi; return audio->read(hdmi, offset); } static int dw_hdmi_i2s_hw_params(struct device *dev, void *data, struct hdmi_codec_daifmt *fmt, struct hdmi_codec_params *hparms) { struct dw_hdmi_i2s_audio_data *audio = data; struct dw_hdmi *hdmi = audio->hdmi; u8 conf0 = 0; u8 conf1 = 0; u8 inputclkfs = 0; /* it cares I2S only */ if (fmt->bit_clk_provider | fmt->frame_clk_provider) { dev_err(dev, "unsupported clock settings\n"); return -EINVAL; } /* Reset the FIFOs before applying new params */ hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0); hdmi_write(audio, (u8)~HDMI_MC_SWRSTZ_I2SSWRST_REQ, HDMI_MC_SWRSTZ); inputclkfs = HDMI_AUD_INPUTCLKFS_64FS; conf0 = (HDMI_AUD_CONF0_I2S_SELECT | HDMI_AUD_CONF0_I2S_EN0); /* Enable the required i2s lanes */ switch (hparms->channels) { case 7 ... 8: conf0 |= HDMI_AUD_CONF0_I2S_EN3; fallthrough; case 5 ... 6: conf0 |= HDMI_AUD_CONF0_I2S_EN2; fallthrough; case 3 ... 4: conf0 |= HDMI_AUD_CONF0_I2S_EN1; /* Fall-thru */ } switch (hparms->sample_width) { case 16: conf1 = HDMI_AUD_CONF1_WIDTH_16; break; case 24: case 32: conf1 = HDMI_AUD_CONF1_WIDTH_24; break; } switch (fmt->fmt) { case HDMI_I2S: conf1 |= HDMI_AUD_CONF1_MODE_I2S; break; case HDMI_RIGHT_J: conf1 |= HDMI_AUD_CONF1_MODE_RIGHT_J; break; case HDMI_LEFT_J: conf1 |= HDMI_AUD_CONF1_MODE_LEFT_J; break; case HDMI_DSP_A: conf1 |= HDMI_AUD_CONF1_MODE_BURST_1; break; case HDMI_DSP_B: conf1 |= HDMI_AUD_CONF1_MODE_BURST_2; break; default: dev_err(dev, "unsupported format\n"); return -EINVAL; } dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate); dw_hdmi_set_channel_status(hdmi, hparms->iec.status); dw_hdmi_set_channel_count(hdmi, hparms->channels); dw_hdmi_set_channel_allocation(hdmi, hparms->cea.channel_allocation); hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS); hdmi_write(audio, conf0, HDMI_AUD_CONF0); hdmi_write(audio, conf1, HDMI_AUD_CONF1); return 0; } static int dw_hdmi_i2s_audio_startup(struct device *dev, void *data) { struct dw_hdmi_i2s_audio_data *audio = data; struct dw_hdmi *hdmi = audio->hdmi; dw_hdmi_audio_enable(hdmi); return 0; } static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data) { struct dw_hdmi_i2s_audio_data *audio = data; struct dw_hdmi *hdmi = audio->hdmi; dw_hdmi_audio_disable(hdmi); } static int dw_hdmi_i2s_get_eld(struct device *dev, void *data, uint8_t *buf, size_t len) { struct dw_hdmi_i2s_audio_data *audio = data; u8 *eld; eld = audio->get_eld(audio->hdmi); if (eld) memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len)); else /* Pass en empty ELD if connector not available */ memset(buf, 0, len); return 0; } static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component, struct device_node *endpoint) { struct of_endpoint of_ep; int ret; ret = of_graph_parse_endpoint(endpoint, &of_ep); if (ret < 0) return ret; /* * HDMI sound should be located as reg = <2> * Then, it is sound port 0 */ if (of_ep.port == 2) return 0; return -EINVAL; } static int dw_hdmi_i2s_hook_plugged_cb(struct device *dev, void *data, hdmi_codec_plugged_cb fn, struct device *codec_dev) { struct dw_hdmi_i2s_audio_data *audio = data; struct dw_hdmi *hdmi = audio->hdmi; return dw_hdmi_set_plugged_cb(hdmi, fn, codec_dev); } static const struct hdmi_codec_ops dw_hdmi_i2s_ops = { .hw_params = dw_hdmi_i2s_hw_params, .audio_startup = dw_hdmi_i2s_audio_startup, .audio_shutdown = dw_hdmi_i2s_audio_shutdown, .get_eld = dw_hdmi_i2s_get_eld, .get_dai_id = dw_hdmi_i2s_get_dai_id, .hook_plugged_cb = dw_hdmi_i2s_hook_plugged_cb, }; static int snd_dw_hdmi_probe(struct platform_device *pdev) { struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data; struct platform_device_info pdevinfo; struct hdmi_codec_pdata pdata; struct platform_device *platform; pdata.ops = &dw_hdmi_i2s_ops; pdata.i2s = 1; pdata.max_i2s_channels = 8; pdata.data = audio; memset(&pdevinfo, 0, sizeof(pdevinfo)); pdevinfo.parent = pdev->dev.parent; pdevinfo.id = PLATFORM_DEVID_AUTO; pdevinfo.name = HDMI_CODEC_DRV_NAME; pdevinfo.data = &pdata; pdevinfo.size_data = sizeof(pdata); pdevinfo.dma_mask = DMA_BIT_MASK(32); platform = platform_device_register_full(&pdevinfo); if (IS_ERR(platform)) return PTR_ERR(platform); dev_set_drvdata(&pdev->dev, platform); return 0; } static int snd_dw_hdmi_remove(struct platform_device *pdev) { struct platform_device *platform = dev_get_drvdata(&pdev->dev); platform_device_unregister(platform); return 0; } static struct platform_driver snd_dw_hdmi_driver = { .probe = snd_dw_hdmi_probe, .remove = snd_dw_hdmi_remove, .driver = { .name = DRIVER_NAME, }, }; module_platform_driver(snd_dw_hdmi_driver); MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:" DRIVER_NAME);