sound/soc/sh/rcar/scu.c

   1 /*
   2  * Renesas R-Car SCU support
   3  *
   4  * Copyright (C) 2013 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include "rsnd.h"
  12
  13 struct rsnd_scu {
  14         struct rsnd_scu_platform_info *info; /* rcar_snd.h */
  15         struct rsnd_mod mod;
  16 };
  17
  18 #define rsnd_scu_mode_flags(p) ((p)->info->flags)
  19
  20 /*
  21  * ADINR
  22  */
  23 #define OTBL_24         (0 << 16)
  24 #define OTBL_22         (2 << 16)
  25 #define OTBL_20         (4 << 16)
  26 #define OTBL_18         (6 << 16)
  27 #define OTBL_16         (8 << 16)
  28
  29
  30 #define rsnd_mod_to_scu(_mod)   \
  31         container_of((_mod), struct rsnd_scu, mod)
  32
  33 #define for_each_rsnd_scu(pos, priv, i)                                 \
  34         for ((i) = 0;                                                   \
  35              ((i) < rsnd_scu_nr(priv)) &&                               \
  36                      ((pos) = (struct rsnd_scu *)(priv)->scu + i);      \
  37              i++)
  38
  39 static int rsnd_scu_set_route(struct rsnd_priv *priv,
  40                               struct rsnd_mod *mod,
  41                               struct rsnd_dai *rdai,
  42                               struct rsnd_dai_stream *io)
  43 {
  44         struct scu_route_config {
  45                 u32 mask;
  46                 int shift;
  47         } routes[] = {
  48                 { 0xF,  0, }, /* 0 */
  49                 { 0xF,  4, }, /* 1 */
  50                 { 0xF,  8, }, /* 2 */
  51                 { 0x7, 12, }, /* 3 */
  52                 { 0x7, 16, }, /* 4 */
  53                 { 0x7, 20, }, /* 5 */
  54                 { 0x7, 24, }, /* 6 */
  55                 { 0x3, 28, }, /* 7 */
  56                 { 0x3, 30, }, /* 8 */
  57         };
  58
  59         u32 mask;
  60         u32 val;
  61         int shift;
  62         int id;
  63
  64         /*
  65          * Gen1 only
  66          */
  67         if (!rsnd_is_gen1(priv))
  68                 return 0;
  69
  70         id = rsnd_mod_id(mod);
  71         if (id < 0 || id > ARRAY_SIZE(routes))
  72                 return -EIO;
  73
  74         /*
  75          * SRC_ROUTE_SELECT
  76          */
  77         val = rsnd_dai_is_play(rdai, io) ? 0x1 : 0x2;
  78         val = val               << routes[id].shift;
  79         mask = routes[id].mask  << routes[id].shift;
  80
  81         rsnd_mod_bset(mod, SRC_ROUTE_SEL, mask, val);
  82
  83         /*
  84          * SRC_TIMING_SELECT
  85          */
  86         shift   = (id % 4) * 8;
  87         mask    = 0x1F << shift;
  88         if (8 == id) /* SRU8 is very special */
  89                 val = id << shift;
  90         else
  91                 val = (id + 1) << shift;
  92
  93         switch (id / 4) {
  94         case 0:
  95                 rsnd_mod_bset(mod, SRC_TMG_SEL0, mask, val);
  96                 break;
  97         case 1:
  98                 rsnd_mod_bset(mod, SRC_TMG_SEL1, mask, val);
  99                 break;
 100         case 2:
 101                 rsnd_mod_bset(mod, SRC_TMG_SEL2, mask, val);
 102                 break;
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int rsnd_scu_set_mode(struct rsnd_priv *priv,
 109                              struct rsnd_mod *mod,
 110                              struct rsnd_dai *rdai,
 111                              struct rsnd_dai_stream *io)
 112 {
 113         int id = rsnd_mod_id(mod);
 114         u32 val;
 115
 116         if (rsnd_is_gen1(priv)) {
 117                 val = (1 << id);
 118                 rsnd_mod_bset(mod, SRC_CTRL, val, val);
 119         }
 120
 121         return 0;
 122 }
 123
 124 static int rsnd_scu_set_hpbif(struct rsnd_priv *priv,
 125                               struct rsnd_mod *mod,
 126                               struct rsnd_dai *rdai,
 127                               struct rsnd_dai_stream *io)
 128 {
 129         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 130         u32 adinr = runtime->channels;
 131
 132         switch (runtime->sample_bits) {
 133         case 16:
 134                 adinr |= OTBL_16;
 135                 break;
 136         case 32:
 137                 adinr |= OTBL_24;
 138                 break;
 139         default:
 140                 return -EIO;
 141         }
 142
 143         rsnd_mod_write(mod, BUSIF_MODE, 1);
 144         rsnd_mod_write(mod, BUSIF_ADINR, adinr);
 145
 146         return 0;
 147 }
 148
 149 bool rsnd_scu_hpbif_is_enable(struct rsnd_mod *mod)
 150 {
 151         struct rsnd_scu *scu = rsnd_mod_to_scu(mod);
 152         u32 flags = rsnd_scu_mode_flags(scu);
 153
 154         return !!(flags & RSND_SCU_USE_HPBIF);
 155 }
 156
 157 static int rsnd_scu_start(struct rsnd_mod *mod,
 158                           struct rsnd_dai *rdai,
 159                           struct rsnd_dai_stream *io)
 160 {
 161         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 162         struct device *dev = rsnd_priv_to_dev(priv);
 163         int ret;
 164
 165         /*
 166          * SCU will be used if it has RSND_SCU_USE_HPBIF flags
 167          */
 168         if (!rsnd_scu_hpbif_is_enable(mod)) {
 169                 /* it use PIO transter */
 170                 dev_dbg(dev, "%s%d is not used\n",
 171                         rsnd_mod_name(mod), rsnd_mod_id(mod));
 172
 173                 return 0;
 174         }
 175
 176         /* it use DMA transter */
 177         ret = rsnd_scu_set_route(priv, mod, rdai, io);
 178         if (ret < 0)
 179                 return ret;
 180
 181         ret = rsnd_scu_set_mode(priv, mod, rdai, io);
 182         if (ret < 0)
 183                 return ret;
 184
 185         ret = rsnd_scu_set_hpbif(priv, mod, rdai, io);
 186         if (ret < 0)
 187                 return ret;
 188
 189         dev_dbg(dev, "%s%d start\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
 190
 191         return 0;
 192 }
 193
 194 static struct rsnd_mod_ops rsnd_scu_ops = {
 195         .name   = "scu",
 196         .start  = rsnd_scu_start,
 197 };
 198
 199 struct rsnd_mod *rsnd_scu_mod_get(struct rsnd_priv *priv, int id)
 200 {
 201         BUG_ON(id < 0 || id >= rsnd_scu_nr(priv));
 202
 203         return &((struct rsnd_scu *)(priv->scu) + id)->mod;
 204 }
 205
 206 int rsnd_scu_probe(struct platform_device *pdev,
 207                    struct rcar_snd_info *info,
 208                    struct rsnd_priv *priv)
 209 {
 210         struct device *dev = rsnd_priv_to_dev(priv);
 211         struct rsnd_scu *scu;
 212         int i, nr;
 213
 214         /*
 215          * init SCU
 216          */
 217         nr      = info->scu_info_nr;
 218         scu     = devm_kzalloc(dev, sizeof(*scu) * nr, GFP_KERNEL);
 219         if (!scu) {
 220                 dev_err(dev, "SCU allocate failed\n");
 221                 return -ENOMEM;
 222         }
 223
 224         priv->scu_nr    = nr;
 225         priv->scu       = scu;
 226
 227         for_each_rsnd_scu(scu, priv, i) {
 228                 rsnd_mod_init(priv, &scu->mod,
 229                               &rsnd_scu_ops, i);
 230                 scu->info = &info->scu_info[i];
 231
 232                 dev_dbg(dev, "SCU%d probed\n", i);
 233         }
 234         dev_dbg(dev, "scu probed\n");
 235
 236         return 0;
 237 }
 238
 239 void rsnd_scu_remove(struct platform_device *pdev,
 240                      struct rsnd_priv *priv)
 241 {
 242 }