1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * dw-hdmi-i2s-audio.c 4 * 5 * Copyright (c) 2017 Renesas Solutions Corp. 6 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 7 */ 8 9 #include <linux/dma-mapping.h> 10 #include <linux/module.h> 11 12 #include <drm/bridge/dw_hdmi.h> 13 14 #include <sound/hdmi-codec.h> 15 16 #include "dw-hdmi.h" 17 #include "dw-hdmi-audio.h" 18 19 #define DRIVER_NAME "dw-hdmi-i2s-audio" 20 21 static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio, 22 u8 val, int offset) 23 { 24 struct dw_hdmi *hdmi = audio->hdmi; 25 26 audio->write(hdmi, val, offset); 27 } 28 29 static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset) 30 { 31 struct dw_hdmi *hdmi = audio->hdmi; 32 33 return audio->read(hdmi, offset); 34 } 35 36 static int dw_hdmi_i2s_hw_params(struct device *dev, void *data, 37 struct hdmi_codec_daifmt *fmt, 38 struct hdmi_codec_params *hparms) 39 { 40 struct dw_hdmi_i2s_audio_data *audio = data; 41 struct dw_hdmi *hdmi = audio->hdmi; 42 u8 conf0 = 0; 43 u8 conf1 = 0; 44 u8 inputclkfs = 0; 45 46 /* it cares I2S only */ 47 if ((fmt->fmt != HDMI_I2S) || 48 (fmt->bit_clk_master | fmt->frame_clk_master)) { 49 dev_err(dev, "unsupported format/settings\n"); 50 return -EINVAL; 51 } 52 53 inputclkfs = HDMI_AUD_INPUTCLKFS_64FS; 54 conf0 = HDMI_AUD_CONF0_I2S_ALL_ENABLE; 55 56 switch (hparms->sample_width) { 57 case 16: 58 conf1 = HDMI_AUD_CONF1_WIDTH_16; 59 break; 60 case 24: 61 case 32: 62 conf1 = HDMI_AUD_CONF1_WIDTH_24; 63 break; 64 } 65 66 dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate); 67 68 hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS); 69 hdmi_write(audio, conf0, HDMI_AUD_CONF0); 70 hdmi_write(audio, conf1, HDMI_AUD_CONF1); 71 72 dw_hdmi_audio_enable(hdmi); 73 74 return 0; 75 } 76 77 static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data) 78 { 79 struct dw_hdmi_i2s_audio_data *audio = data; 80 struct dw_hdmi *hdmi = audio->hdmi; 81 82 dw_hdmi_audio_disable(hdmi); 83 84 hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0); 85 } 86 87 static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component, 88 struct device_node *endpoint) 89 { 90 struct of_endpoint of_ep; 91 int ret; 92 93 ret = of_graph_parse_endpoint(endpoint, &of_ep); 94 if (ret < 0) 95 return ret; 96 97 /* 98 * HDMI sound should be located as reg = <2> 99 * Then, it is sound port 0 100 */ 101 if (of_ep.port == 2) 102 return 0; 103 104 return -EINVAL; 105 } 106 107 static struct hdmi_codec_ops dw_hdmi_i2s_ops = { 108 .hw_params = dw_hdmi_i2s_hw_params, 109 .audio_shutdown = dw_hdmi_i2s_audio_shutdown, 110 .get_dai_id = dw_hdmi_i2s_get_dai_id, 111 }; 112 113 static int snd_dw_hdmi_probe(struct platform_device *pdev) 114 { 115 struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data; 116 struct platform_device_info pdevinfo; 117 struct hdmi_codec_pdata pdata; 118 struct platform_device *platform; 119 120 pdata.ops = &dw_hdmi_i2s_ops; 121 pdata.i2s = 1; 122 pdata.max_i2s_channels = 6; 123 pdata.data = audio; 124 125 memset(&pdevinfo, 0, sizeof(pdevinfo)); 126 pdevinfo.parent = pdev->dev.parent; 127 pdevinfo.id = PLATFORM_DEVID_AUTO; 128 pdevinfo.name = HDMI_CODEC_DRV_NAME; 129 pdevinfo.data = &pdata; 130 pdevinfo.size_data = sizeof(pdata); 131 pdevinfo.dma_mask = DMA_BIT_MASK(32); 132 133 platform = platform_device_register_full(&pdevinfo); 134 if (IS_ERR(platform)) 135 return PTR_ERR(platform); 136 137 dev_set_drvdata(&pdev->dev, platform); 138 139 return 0; 140 } 141 142 static int snd_dw_hdmi_remove(struct platform_device *pdev) 143 { 144 struct platform_device *platform = dev_get_drvdata(&pdev->dev); 145 146 platform_device_unregister(platform); 147 148 return 0; 149 } 150 151 static struct platform_driver snd_dw_hdmi_driver = { 152 .probe = snd_dw_hdmi_probe, 153 .remove = snd_dw_hdmi_remove, 154 .driver = { 155 .name = DRIVER_NAME, 156 }, 157 }; 158 module_platform_driver(snd_dw_hdmi_driver); 159 160 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); 161 MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface"); 162 MODULE_LICENSE("GPL v2"); 163 MODULE_ALIAS("platform:" DRIVER_NAME); 164