sound/soc/meson/aiu-fifo-spdif.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2020 BayLibre, SAS.
   4 // Author: Jerome Brunet <jbrunet@baylibre.com>
   5
   6 #include <linux/clk.h>
   7 #include <sound/pcm_params.h>
   8 #include <sound/soc.h>
   9 #include <sound/soc-dai.h>
  10
  11 #include "aiu.h"
  12 #include "aiu-fifo.h"
  13
  14 #define AIU_IEC958_DCU_FF_CTRL_EN               BIT(0)
  15 #define AIU_IEC958_DCU_FF_CTRL_AUTO_DISABLE     BIT(1)
  16 #define AIU_IEC958_DCU_FF_CTRL_IRQ_MODE         GENMASK(3, 2)
  17 #define AIU_IEC958_DCU_FF_CTRL_IRQ_OUT_THD      BIT(2)
  18 #define AIU_IEC958_DCU_FF_CTRL_IRQ_FRAME_READ   BIT(3)
  19 #define AIU_IEC958_DCU_FF_CTRL_SYNC_HEAD_EN     BIT(4)
  20 #define AIU_IEC958_DCU_FF_CTRL_BYTE_SEEK        BIT(5)
  21 #define AIU_IEC958_DCU_FF_CTRL_CONTINUE         BIT(6)
  22 #define AIU_MEM_IEC958_CONTROL_ENDIAN           GENMASK(5, 3)
  23 #define AIU_MEM_IEC958_CONTROL_RD_DDR           BIT(6)
  24 #define AIU_MEM_IEC958_CONTROL_MODE_16BIT       BIT(7)
  25 #define AIU_MEM_IEC958_CONTROL_MODE_LINEAR      BIT(8)
  26 #define AIU_MEM_IEC958_BUF_CNTL_INIT            BIT(0)
  27
  28 #define AIU_FIFO_SPDIF_BLOCK                    8
  29
  30 static struct snd_pcm_hardware fifo_spdif_pcm = {
  31         .info = (SNDRV_PCM_INFO_INTERLEAVED |
  32                  SNDRV_PCM_INFO_MMAP |
  33                  SNDRV_PCM_INFO_MMAP_VALID |
  34                  SNDRV_PCM_INFO_PAUSE),
  35         .formats = AIU_FORMATS,
  36         .rate_min = 5512,
  37         .rate_max = 192000,
  38         .channels_min = 2,
  39         .channels_max = 2,
  40         .period_bytes_min = AIU_FIFO_SPDIF_BLOCK,
  41         .period_bytes_max = AIU_FIFO_SPDIF_BLOCK * USHRT_MAX,
  42         .periods_min = 2,
  43         .periods_max = UINT_MAX,
  44
  45         /* No real justification for this */
  46         .buffer_bytes_max = 1 * 1024 * 1024,
  47 };
  48
  49 static void fifo_spdif_dcu_enable(struct snd_soc_component *component,
  50                                   bool enable)
  51 {
  52         snd_soc_component_update_bits(component, AIU_IEC958_DCU_FF_CTRL,
  53                                       AIU_IEC958_DCU_FF_CTRL_EN,
  54                                       enable ? AIU_IEC958_DCU_FF_CTRL_EN : 0);
  55 }
  56
  57 static int fifo_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
  58                               struct snd_soc_dai *dai)
  59 {
  60         struct snd_soc_component *component = dai->component;
  61         int ret;
  62
  63         ret = aiu_fifo_trigger(substream, cmd, dai);
  64         if (ret)
  65                 return ret;
  66
  67         switch (cmd) {
  68         case SNDRV_PCM_TRIGGER_START:
  69         case SNDRV_PCM_TRIGGER_RESUME:
  70         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  71                 fifo_spdif_dcu_enable(component, true);
  72                 break;
  73         case SNDRV_PCM_TRIGGER_SUSPEND:
  74         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  75         case SNDRV_PCM_TRIGGER_STOP:
  76                 fifo_spdif_dcu_enable(component, false);
  77                 break;
  78         default:
  79                 return -EINVAL;
  80         }
  81
  82         return 0;
  83 }
  84
  85 static int fifo_spdif_prepare(struct snd_pcm_substream *substream,
  86                               struct snd_soc_dai *dai)
  87 {
  88         struct snd_soc_component *component = dai->component;
  89         int ret;
  90
  91         ret = aiu_fifo_prepare(substream, dai);
  92         if (ret)
  93                 return ret;
  94
  95         snd_soc_component_update_bits(component,
  96                                       AIU_MEM_IEC958_BUF_CNTL,
  97                                       AIU_MEM_IEC958_BUF_CNTL_INIT,
  98                                       AIU_MEM_IEC958_BUF_CNTL_INIT);
  99         snd_soc_component_update_bits(component,
 100                                       AIU_MEM_IEC958_BUF_CNTL,
 101                                       AIU_MEM_IEC958_BUF_CNTL_INIT, 0);
 102
 103         return 0;
 104 }
 105
 106 static int fifo_spdif_hw_params(struct snd_pcm_substream *substream,
 107                                 struct snd_pcm_hw_params *params,
 108                                 struct snd_soc_dai *dai)
 109 {
 110         struct snd_soc_component *component = dai->component;
 111         unsigned int val;
 112         int ret;
 113
 114         ret = aiu_fifo_hw_params(substream, params, dai);
 115         if (ret)
 116                 return ret;
 117
 118         val = AIU_MEM_IEC958_CONTROL_RD_DDR |
 119               AIU_MEM_IEC958_CONTROL_MODE_LINEAR;
 120
 121         switch (params_physical_width(params)) {
 122         case 16:
 123                 val |= AIU_MEM_IEC958_CONTROL_MODE_16BIT;
 124                 break;
 125         case 32:
 126                 break;
 127         default:
 128                 dev_err(dai->dev, "Unsupported physical width %u\n",
 129                         params_physical_width(params));
 130                 return -EINVAL;
 131         }
 132
 133         snd_soc_component_update_bits(component, AIU_MEM_IEC958_CONTROL,
 134                                       AIU_MEM_IEC958_CONTROL_ENDIAN |
 135                                       AIU_MEM_IEC958_CONTROL_RD_DDR |
 136                                       AIU_MEM_IEC958_CONTROL_MODE_LINEAR |
 137                                       AIU_MEM_IEC958_CONTROL_MODE_16BIT,
 138                                       val);
 139
 140         /* Number bytes read by the FIFO between each IRQ */
 141         snd_soc_component_write(component, AIU_IEC958_BPF,
 142                                 params_period_bytes(params));
 143
 144         /*
 145          * AUTO_DISABLE and SYNC_HEAD are enabled by default but
 146          * this should be disabled in PCM (uncompressed) mode
 147          */
 148         snd_soc_component_update_bits(component, AIU_IEC958_DCU_FF_CTRL,
 149                                       AIU_IEC958_DCU_FF_CTRL_AUTO_DISABLE |
 150                                       AIU_IEC958_DCU_FF_CTRL_IRQ_MODE |
 151                                       AIU_IEC958_DCU_FF_CTRL_SYNC_HEAD_EN,
 152                                       AIU_IEC958_DCU_FF_CTRL_IRQ_FRAME_READ);
 153
 154         return 0;
 155 }
 156
 157 const struct snd_soc_dai_ops aiu_fifo_spdif_dai_ops = {
 158         .trigger        = fifo_spdif_trigger,
 159         .prepare        = fifo_spdif_prepare,
 160         .hw_params      = fifo_spdif_hw_params,
 161         .startup        = aiu_fifo_startup,
 162         .shutdown       = aiu_fifo_shutdown,
 163 };
 164
 165 int aiu_fifo_spdif_dai_probe(struct snd_soc_dai *dai)
 166 {
 167         struct snd_soc_component *component = dai->component;
 168         struct aiu *aiu = snd_soc_component_get_drvdata(component);
 169         struct aiu_fifo *fifo;
 170         int ret;
 171
 172         ret = aiu_fifo_dai_probe(dai);
 173         if (ret)
 174                 return ret;
 175
 176         fifo = dai->playback_dma_data;
 177
 178         fifo->pcm = &fifo_spdif_pcm;
 179         fifo->mem_offset = AIU_MEM_IEC958_START;
 180         fifo->fifo_block = 1;
 181         fifo->pclk = aiu->spdif.clks[PCLK].clk;
 182         fifo->irq = aiu->spdif.irq;
 183
 184         return 0;
 185 }