drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c

   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 #include <drm/drm_crtc.h>
  14
  15 #include <sound/hdmi-codec.h>
  16
  17 #include "dw-hdmi.h"
  18 #include "dw-hdmi-audio.h"
  19
  20 #define DRIVER_NAME "dw-hdmi-i2s-audio"
  21
  22 static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
  23                               u8 val, int offset)
  24 {
  25         struct dw_hdmi *hdmi = audio->hdmi;
  26
  27         audio->write(hdmi, val, offset);
  28 }
  29
  30 static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
  31 {
  32         struct dw_hdmi *hdmi = audio->hdmi;
  33
  34         return audio->read(hdmi, offset);
  35 }
  36
  37 static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
  38                                  struct hdmi_codec_daifmt *fmt,
  39                                  struct hdmi_codec_params *hparms)
  40 {
  41         struct dw_hdmi_i2s_audio_data *audio = data;
  42         struct dw_hdmi *hdmi = audio->hdmi;
  43         u8 conf0 = 0;
  44         u8 conf1 = 0;
  45         u8 inputclkfs = 0;
  46
  47         /* it cares I2S only */
  48         if (fmt->bit_clk_master | fmt->frame_clk_master) {
  49                 dev_err(dev, "unsupported clock settings\n");
  50                 return -EINVAL;
  51         }
  52
  53         /* Reset the FIFOs before applying new params */
  54         hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
  55         hdmi_write(audio, (u8)~HDMI_MC_SWRSTZ_I2SSWRST_REQ, HDMI_MC_SWRSTZ);
  56
  57         inputclkfs      = HDMI_AUD_INPUTCLKFS_64FS;
  58         conf0           = (HDMI_AUD_CONF0_I2S_SELECT | HDMI_AUD_CONF0_I2S_EN0);
  59
  60         /* Enable the required i2s lanes */
  61         switch (hparms->channels) {
  62         case 7 ... 8:
  63                 conf0 |= HDMI_AUD_CONF0_I2S_EN3;
  64                 /* Fall-thru */
  65         case 5 ... 6:
  66                 conf0 |= HDMI_AUD_CONF0_I2S_EN2;
  67                 /* Fall-thru */
  68         case 3 ... 4:
  69                 conf0 |= HDMI_AUD_CONF0_I2S_EN1;
  70                 /* Fall-thru */
  71         }
  72
  73         switch (hparms->sample_width) {
  74         case 16:
  75                 conf1 = HDMI_AUD_CONF1_WIDTH_16;
  76                 break;
  77         case 24:
  78         case 32:
  79                 conf1 = HDMI_AUD_CONF1_WIDTH_24;
  80                 break;
  81         }
  82
  83         switch (fmt->fmt) {
  84         case HDMI_I2S:
  85                 conf1 |= HDMI_AUD_CONF1_MODE_I2S;
  86                 break;
  87         case HDMI_RIGHT_J:
  88                 conf1 |= HDMI_AUD_CONF1_MODE_RIGHT_J;
  89                 break;
  90         case HDMI_LEFT_J:
  91                 conf1 |= HDMI_AUD_CONF1_MODE_LEFT_J;
  92                 break;
  93         case HDMI_DSP_A:
  94                 conf1 |= HDMI_AUD_CONF1_MODE_BURST_1;
  95                 break;
  96         case HDMI_DSP_B:
  97                 conf1 |= HDMI_AUD_CONF1_MODE_BURST_2;
  98                 break;
  99         default:
 100                 dev_err(dev, "unsupported format\n");
 101                 return -EINVAL;
 102         }
 103
 104         dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
 105         dw_hdmi_set_channel_count(hdmi, hparms->channels);
 106         dw_hdmi_set_channel_allocation(hdmi, hparms->cea.channel_allocation);
 107
 108         hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
 109         hdmi_write(audio, conf0, HDMI_AUD_CONF0);
 110         hdmi_write(audio, conf1, HDMI_AUD_CONF1);
 111
 112         dw_hdmi_audio_enable(hdmi);
 113
 114         return 0;
 115 }
 116
 117 static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
 118 {
 119         struct dw_hdmi_i2s_audio_data *audio = data;
 120         struct dw_hdmi *hdmi = audio->hdmi;
 121
 122         dw_hdmi_audio_disable(hdmi);
 123 }
 124
 125 static int dw_hdmi_i2s_get_eld(struct device *dev, void *data, uint8_t *buf,
 126                                size_t len)
 127 {
 128         struct dw_hdmi_i2s_audio_data *audio = data;
 129
 130         memcpy(buf, audio->eld, min_t(size_t, MAX_ELD_BYTES, len));
 131         return 0;
 132 }
 133
 134 static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
 135                                   struct device_node *endpoint)
 136 {
 137         struct of_endpoint of_ep;
 138         int ret;
 139
 140         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 141         if (ret < 0)
 142                 return ret;
 143
 144         /*
 145          * HDMI sound should be located as reg = <2>
 146          * Then, it is sound port 0
 147          */
 148         if (of_ep.port == 2)
 149                 return 0;
 150
 151         return -EINVAL;
 152 }
 153
 154 static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
 155         .hw_params      = dw_hdmi_i2s_hw_params,
 156         .audio_shutdown = dw_hdmi_i2s_audio_shutdown,
 157         .get_eld        = dw_hdmi_i2s_get_eld,
 158         .get_dai_id     = dw_hdmi_i2s_get_dai_id,
 159 };
 160
 161 static int snd_dw_hdmi_probe(struct platform_device *pdev)
 162 {
 163         struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
 164         struct platform_device_info pdevinfo;
 165         struct hdmi_codec_pdata pdata;
 166         struct platform_device *platform;
 167
 168         pdata.ops               = &dw_hdmi_i2s_ops;
 169         pdata.i2s               = 1;
 170         pdata.max_i2s_channels  = 8;
 171         pdata.data              = audio;
 172
 173         memset(&pdevinfo, 0, sizeof(pdevinfo));
 174         pdevinfo.parent         = pdev->dev.parent;
 175         pdevinfo.id             = PLATFORM_DEVID_AUTO;
 176         pdevinfo.name           = HDMI_CODEC_DRV_NAME;
 177         pdevinfo.data           = &pdata;
 178         pdevinfo.size_data      = sizeof(pdata);
 179         pdevinfo.dma_mask       = DMA_BIT_MASK(32);
 180
 181         platform = platform_device_register_full(&pdevinfo);
 182         if (IS_ERR(platform))
 183                 return PTR_ERR(platform);
 184
 185         dev_set_drvdata(&pdev->dev, platform);
 186
 187         return 0;
 188 }
 189
 190 static int snd_dw_hdmi_remove(struct platform_device *pdev)
 191 {
 192         struct platform_device *platform = dev_get_drvdata(&pdev->dev);
 193
 194         platform_device_unregister(platform);
 195
 196         return 0;
 197 }
 198
 199 static struct platform_driver snd_dw_hdmi_driver = {
 200         .probe  = snd_dw_hdmi_probe,
 201         .remove = snd_dw_hdmi_remove,
 202         .driver = {
 203                 .name = DRIVER_NAME,
 204         },
 205 };
 206 module_platform_driver(snd_dw_hdmi_driver);
 207
 208 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
 209 MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
 210 MODULE_LICENSE("GPL v2");
 211 MODULE_ALIAS("platform:" DRIVER_NAME);