sound/soc/sh/rcar/gen.c

   1 /*
   2  * Renesas R-Car Gen1 SRU/SSI 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
  12 /*
  13  * #define DEBUG
  14  *
  15  * you can also add below in
  16  * ${LINUX}/drivers/base/regmap/regmap.c
  17  * for regmap debug
  18  *
  19  * #define LOG_DEVICE "xxxx.rcar_sound"
  20  */
  21
  22 #include "rsnd.h"
  23
  24 struct rsnd_gen {
  25         void __iomem *base[RSND_BASE_MAX];
  26
  27         struct rsnd_gen_ops *ops;
  28
  29         struct regmap *regmap[RSND_BASE_MAX];
  30         struct regmap_field *regs[RSND_REG_MAX];
  31 };
  32
  33 #define rsnd_priv_to_gen(p)     ((struct rsnd_gen *)(p)->gen)
  34
  35 struct rsnd_regmap_field_conf {
  36         int idx;
  37         unsigned int reg_offset;
  38         unsigned int id_offset;
  39 };
  40
  41 #define RSND_REG_SET(id, offset, _id_offset)    \
  42 {                                               \
  43         .idx = id,                              \
  44         .reg_offset = offset,                   \
  45         .id_offset = _id_offset,                \
  46 }
  47 /* single address mapping */
  48 #define RSND_GEN_S_REG(id, offset)      \
  49         RSND_REG_SET(RSND_REG_##id, offset, 0)
  50
  51 /* multi address mapping */
  52 #define RSND_GEN_M_REG(id, offset, _id_offset)  \
  53         RSND_REG_SET(RSND_REG_##id, offset, _id_offset)
  54
  55 /*
  56  *              basic function
  57  */
  58 static int rsnd_is_accessible_reg(struct rsnd_priv *priv,
  59                                   struct rsnd_gen *gen, enum rsnd_reg reg)
  60 {
  61         if (!gen->regs[reg]) {
  62                 struct device *dev = rsnd_priv_to_dev(priv);
  63
  64                 dev_err(dev, "unsupported register access %x\n", reg);
  65                 return 0;
  66         }
  67
  68         return 1;
  69 }
  70
  71 u32 rsnd_read(struct rsnd_priv *priv,
  72               struct rsnd_mod *mod, enum rsnd_reg reg)
  73 {
  74         struct device *dev = rsnd_priv_to_dev(priv);
  75         struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
  76         u32 val;
  77
  78         if (!rsnd_is_accessible_reg(priv, gen, reg))
  79                 return 0;
  80
  81         dev_dbg(dev, "r %s[%d] - %4d : %08x\n",
  82                 rsnd_mod_name(mod), rsnd_mod_id(mod), reg, val);
  83
  84         regmap_fields_read(gen->regs[reg], rsnd_mod_id(mod), &val);
  85
  86         return val;
  87 }
  88
  89 void rsnd_write(struct rsnd_priv *priv,
  90                 struct rsnd_mod *mod,
  91                 enum rsnd_reg reg, u32 data)
  92 {
  93         struct device *dev = rsnd_priv_to_dev(priv);
  94         struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
  95
  96         if (!rsnd_is_accessible_reg(priv, gen, reg))
  97                 return;
  98
  99         dev_dbg(dev, "w %s[%d] - %4d : %08x\n",
 100                 rsnd_mod_name(mod), rsnd_mod_id(mod), reg, data);
 101
 102         regmap_fields_write(gen->regs[reg], rsnd_mod_id(mod), data);
 103 }
 104
 105 void rsnd_bset(struct rsnd_priv *priv, struct rsnd_mod *mod,
 106                enum rsnd_reg reg, u32 mask, u32 data)
 107 {
 108         struct device *dev = rsnd_priv_to_dev(priv);
 109         struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
 110
 111         if (!rsnd_is_accessible_reg(priv, gen, reg))
 112                 return;
 113
 114         dev_dbg(dev, "b %s[%d] - %4d : %08x/%08x\n",
 115                 rsnd_mod_name(mod), rsnd_mod_id(mod), reg, data, mask);
 116
 117         regmap_fields_update_bits(gen->regs[reg], rsnd_mod_id(mod),
 118                                   mask, data);
 119 }
 120
 121 #define rsnd_gen_regmap_init(priv, id_size, reg_id, conf)               \
 122         _rsnd_gen_regmap_init(priv, id_size, reg_id, conf, ARRAY_SIZE(conf))
 123 static int _rsnd_gen_regmap_init(struct rsnd_priv *priv,
 124                                  int id_size,
 125                                  int reg_id,
 126                                  struct rsnd_regmap_field_conf *conf,
 127                                  int conf_size)
 128 {
 129         struct platform_device *pdev = rsnd_priv_to_pdev(priv);
 130         struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
 131         struct device *dev = rsnd_priv_to_dev(priv);
 132         struct resource *res;
 133         struct regmap_config regc;
 134         struct regmap_field *regs;
 135         struct regmap *regmap;
 136         struct reg_field regf;
 137         void __iomem *base;
 138         int i;
 139
 140         memset(&regc, 0, sizeof(regc));
 141         regc.reg_bits = 32;
 142         regc.val_bits = 32;
 143         regc.reg_stride = 4;
 144
 145         res = platform_get_resource(pdev, IORESOURCE_MEM, reg_id);
 146         if (!res)
 147                 return -ENODEV;
 148
 149         base = devm_ioremap_resource(dev, res);
 150         if (IS_ERR(base))
 151                 return PTR_ERR(base);
 152
 153         regmap = devm_regmap_init_mmio(dev, base, &regc);
 154         if (IS_ERR(regmap))
 155                 return PTR_ERR(regmap);
 156
 157         gen->base[reg_id] = base;
 158         gen->regmap[reg_id] = regmap;
 159
 160         for (i = 0; i < conf_size; i++) {
 161
 162                 regf.reg        = conf[i].reg_offset;
 163                 regf.id_offset  = conf[i].id_offset;
 164                 regf.lsb        = 0;
 165                 regf.msb        = 31;
 166                 regf.id_size    = id_size;
 167
 168                 regs = devm_regmap_field_alloc(dev, regmap, regf);
 169                 if (IS_ERR(regs))
 170                         return PTR_ERR(regs);
 171
 172                 gen->regs[conf[i].idx] = regs;
 173         }
 174
 175         return 0;
 176 }
 177
 178 /*
 179  *      DMA read/write register offset
 180  *
 181  *      RSND_xxx_I_N    for Audio DMAC input
 182  *      RSND_xxx_O_N    for Audio DMAC output
 183  *      RSND_xxx_I_P    for Audio DMAC peri peri input
 184  *      RSND_xxx_O_P    for Audio DMAC peri peri output
 185  *
 186  *      ex) R-Car H2 case
 187  *            mod        / DMAC in    / DMAC out   / DMAC PP in / DMAC pp out
 188  *      SSI : 0xec541000 / 0xec241008 / 0xec24100c
 189  *      SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
 190  *      SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
 191  *      CMD : 0xec500000 /            / 0xec008000                0xec308000
 192  */
 193 #define RDMA_SSI_I_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
 194 #define RDMA_SSI_O_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
 195
 196 #define RDMA_SSIU_I_N(addr, i)  (addr ##_reg - 0x00441000 + (0x1000 * i))
 197 #define RDMA_SSIU_O_N(addr, i)  (addr ##_reg - 0x00441000 + (0x1000 * i))
 198
 199 #define RDMA_SSIU_I_P(addr, i)  (addr ##_reg - 0x00141000 + (0x1000 * i))
 200 #define RDMA_SSIU_O_P(addr, i)  (addr ##_reg - 0x00141000 + (0x1000 * i))
 201
 202 #define RDMA_SRC_I_N(addr, i)   (addr ##_reg - 0x00500000 + (0x400 * i))
 203 #define RDMA_SRC_O_N(addr, i)   (addr ##_reg - 0x004fc000 + (0x400 * i))
 204
 205 #define RDMA_SRC_I_P(addr, i)   (addr ##_reg - 0x00200000 + (0x400 * i))
 206 #define RDMA_SRC_O_P(addr, i)   (addr ##_reg - 0x001fc000 + (0x400 * i))
 207
 208 #define RDMA_CMD_O_N(addr, i)   (addr ##_reg - 0x004f8000 + (0x400 * i))
 209 #define RDMA_CMD_O_P(addr, i)   (addr ##_reg - 0x001f8000 + (0x400 * i))
 210
 211 static dma_addr_t
 212 rsnd_gen2_dma_addr(struct rsnd_priv *priv,
 213                    struct rsnd_mod *mod,
 214                    int is_play, int is_from)
 215 {
 216         struct platform_device *pdev = rsnd_priv_to_pdev(priv);
 217         struct device *dev = rsnd_priv_to_dev(priv);
 218         struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
 219         dma_addr_t ssi_reg = platform_get_resource(pdev,
 220                                 IORESOURCE_MEM, RSND_GEN2_SSI)->start;
 221         dma_addr_t src_reg = platform_get_resource(pdev,
 222                                 IORESOURCE_MEM, RSND_GEN2_SCU)->start;
 223         int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
 224         int use_src = !!rsnd_io_to_mod_src(io);
 225         int use_dvc = !!rsnd_io_to_mod_dvc(io);
 226         int id = rsnd_mod_id(mod);
 227         struct dma_addr {
 228                 dma_addr_t out_addr;
 229                 dma_addr_t in_addr;
 230         } dma_addrs[3][2][3] = {
 231                 /* SRC */
 232                 {{{ 0,                          0 },
 233                 /* Capture */
 234                   { RDMA_SRC_O_N(src, id),      RDMA_SRC_I_P(src, id) },
 235                   { RDMA_CMD_O_N(src, id),      RDMA_SRC_I_P(src, id) } },
 236                  /* Playback */
 237                  {{ 0,                          0, },
 238                   { RDMA_SRC_O_P(src, id),      RDMA_SRC_I_N(src, id) },
 239                   { RDMA_CMD_O_P(src, id),      RDMA_SRC_I_N(src, id) } }
 240                 },
 241                 /* SSI */
 242                 /* Capture */
 243                 {{{ RDMA_SSI_O_N(ssi, id),      0 },
 244                   { RDMA_SSIU_O_P(ssi, id),     0 },
 245                   { RDMA_SSIU_O_P(ssi, id),     0 } },
 246                  /* Playback */
 247                  {{ 0,                          RDMA_SSI_I_N(ssi, id) },
 248                   { 0,                          RDMA_SSIU_I_P(ssi, id) },
 249                   { 0,                          RDMA_SSIU_I_P(ssi, id) } }
 250                 },
 251                 /* SSIU */
 252                 /* Capture */
 253                 {{{ RDMA_SSIU_O_N(ssi, id),     0 },
 254                   { RDMA_SSIU_O_P(ssi, id),     0 },
 255                   { RDMA_SSIU_O_P(ssi, id),     0 } },
 256                  /* Playback */
 257                  {{ 0,                          RDMA_SSIU_I_N(ssi, id) },
 258                   { 0,                          RDMA_SSIU_I_P(ssi, id) },
 259                   { 0,                          RDMA_SSIU_I_P(ssi, id) } } },
 260         };
 261
 262         /* it shouldn't happen */
 263         if (use_dvc && !use_src)
 264                 dev_err(dev, "DVC is selected without SRC\n");
 265
 266         /* use SSIU or SSI ? */
 267         if (is_ssi && (0 == strcmp(rsnd_mod_dma_name(mod), "ssiu")))
 268                 is_ssi++;
 269
 270         return (is_from) ?
 271                 dma_addrs[is_ssi][is_play][use_src + use_dvc].out_addr :
 272                 dma_addrs[is_ssi][is_play][use_src + use_dvc].in_addr;
 273 }
 274
 275 dma_addr_t rsnd_gen_dma_addr(struct rsnd_priv *priv,
 276                              struct rsnd_mod *mod,
 277                              int is_play, int is_from)
 278 {
 279         /*
 280          * gen1 uses default DMA addr
 281          */
 282         if (rsnd_is_gen1(priv))
 283                 return 0;
 284
 285         if (!mod)
 286                 return 0;
 287
 288         return rsnd_gen2_dma_addr(priv, mod, is_play, is_from);
 289 }
 290
 291 /*
 292  *              Gen2
 293  */
 294 static int rsnd_gen2_probe(struct platform_device *pdev,
 295                            struct rsnd_priv *priv)
 296 {
 297         struct device *dev = rsnd_priv_to_dev(priv);
 298         struct rsnd_regmap_field_conf conf_ssiu[] = {
 299                 RSND_GEN_S_REG(SSI_MODE0,       0x800),
 300                 RSND_GEN_S_REG(SSI_MODE1,       0x804),
 301                 /* FIXME: it needs SSI_MODE2/3 in the future */
 302                 RSND_GEN_M_REG(SSI_BUSIF_MODE,  0x0,    0x80),
 303                 RSND_GEN_M_REG(SSI_BUSIF_ADINR, 0x4,    0x80),
 304                 RSND_GEN_M_REG(BUSIF_DALIGN,    0x8,    0x80),
 305                 RSND_GEN_M_REG(SSI_CTRL,        0x10,   0x80),
 306                 RSND_GEN_M_REG(INT_ENABLE,      0x18,   0x80),
 307         };
 308         struct rsnd_regmap_field_conf conf_scu[] = {
 309                 RSND_GEN_M_REG(SRC_BUSIF_MODE,  0x0,    0x20),
 310                 RSND_GEN_M_REG(SRC_ROUTE_MODE0, 0xc,    0x20),
 311                 RSND_GEN_M_REG(SRC_CTRL,        0x10,   0x20),
 312                 RSND_GEN_M_REG(CMD_ROUTE_SLCT,  0x18c,  0x20),
 313                 RSND_GEN_M_REG(CMD_CTRL,        0x190,  0x20),
 314                 RSND_GEN_M_REG(SRC_SWRSR,       0x200,  0x40),
 315                 RSND_GEN_M_REG(SRC_SRCIR,       0x204,  0x40),
 316                 RSND_GEN_M_REG(SRC_ADINR,       0x214,  0x40),
 317                 RSND_GEN_M_REG(SRC_IFSCR,       0x21c,  0x40),
 318                 RSND_GEN_M_REG(SRC_IFSVR,       0x220,  0x40),
 319                 RSND_GEN_M_REG(SRC_SRCCR,       0x224,  0x40),
 320                 RSND_GEN_M_REG(SRC_BSDSR,       0x22c,  0x40),
 321                 RSND_GEN_M_REG(SRC_BSISR,       0x238,  0x40),
 322                 RSND_GEN_M_REG(DVC_SWRSR,       0xe00,  0x100),
 323                 RSND_GEN_M_REG(DVC_DVUIR,       0xe04,  0x100),
 324                 RSND_GEN_M_REG(DVC_ADINR,       0xe08,  0x100),
 325                 RSND_GEN_M_REG(DVC_DVUCR,       0xe10,  0x100),
 326                 RSND_GEN_M_REG(DVC_ZCMCR,       0xe14,  0x100),
 327                 RSND_GEN_M_REG(DVC_VRCTR,       0xe18,  0x100),
 328                 RSND_GEN_M_REG(DVC_VRPDR,       0xe1c,  0x100),
 329                 RSND_GEN_M_REG(DVC_VRDBR,       0xe20,  0x100),
 330                 RSND_GEN_M_REG(DVC_VOL0R,       0xe28,  0x100),
 331                 RSND_GEN_M_REG(DVC_VOL1R,       0xe2c,  0x100),
 332                 RSND_GEN_M_REG(DVC_DVUER,       0xe48,  0x100),
 333         };
 334         struct rsnd_regmap_field_conf conf_adg[] = {
 335                 RSND_GEN_S_REG(BRRA,            0x00),
 336                 RSND_GEN_S_REG(BRRB,            0x04),
 337                 RSND_GEN_S_REG(SSICKR,          0x08),
 338                 RSND_GEN_S_REG(AUDIO_CLK_SEL0,  0x0c),
 339                 RSND_GEN_S_REG(AUDIO_CLK_SEL1,  0x10),
 340                 RSND_GEN_S_REG(AUDIO_CLK_SEL2,  0x14),
 341                 RSND_GEN_S_REG(DIV_EN,          0x30),
 342                 RSND_GEN_S_REG(SRCIN_TIMSEL0,   0x34),
 343                 RSND_GEN_S_REG(SRCIN_TIMSEL1,   0x38),
 344                 RSND_GEN_S_REG(SRCIN_TIMSEL2,   0x3c),
 345                 RSND_GEN_S_REG(SRCIN_TIMSEL3,   0x40),
 346                 RSND_GEN_S_REG(SRCIN_TIMSEL4,   0x44),
 347                 RSND_GEN_S_REG(SRCOUT_TIMSEL0,  0x48),
 348                 RSND_GEN_S_REG(SRCOUT_TIMSEL1,  0x4c),
 349                 RSND_GEN_S_REG(SRCOUT_TIMSEL2,  0x50),
 350                 RSND_GEN_S_REG(SRCOUT_TIMSEL3,  0x54),
 351                 RSND_GEN_S_REG(SRCOUT_TIMSEL4,  0x58),
 352                 RSND_GEN_S_REG(CMDOUT_TIMSEL,   0x5c),
 353         };
 354         struct rsnd_regmap_field_conf conf_ssi[] = {
 355                 RSND_GEN_M_REG(SSICR,           0x00,   0x40),
 356                 RSND_GEN_M_REG(SSISR,           0x04,   0x40),
 357                 RSND_GEN_M_REG(SSITDR,          0x08,   0x40),
 358                 RSND_GEN_M_REG(SSIRDR,          0x0c,   0x40),
 359                 RSND_GEN_M_REG(SSIWSR,          0x20,   0x40),
 360         };
 361         int ret_ssiu;
 362         int ret_scu;
 363         int ret_adg;
 364         int ret_ssi;
 365
 366         ret_ssiu = rsnd_gen_regmap_init(priv, 10, RSND_GEN2_SSIU, conf_ssiu);
 367         ret_scu  = rsnd_gen_regmap_init(priv, 10, RSND_GEN2_SCU,  conf_scu);
 368         ret_adg  = rsnd_gen_regmap_init(priv, 10, RSND_GEN2_ADG,  conf_adg);
 369         ret_ssi  = rsnd_gen_regmap_init(priv, 10, RSND_GEN2_SSI,  conf_ssi);
 370         if (ret_ssiu < 0 ||
 371             ret_scu  < 0 ||
 372             ret_adg  < 0 ||
 373             ret_ssi  < 0)
 374                 return ret_ssiu | ret_scu | ret_adg | ret_ssi;
 375
 376         dev_dbg(dev, "Gen2 is probed\n");
 377
 378         return 0;
 379 }
 380
 381 /*
 382  *              Gen1
 383  */
 384
 385 static int rsnd_gen1_probe(struct platform_device *pdev,
 386                            struct rsnd_priv *priv)
 387 {
 388         struct device *dev = rsnd_priv_to_dev(priv);
 389         struct rsnd_regmap_field_conf conf_sru[] = {
 390                 RSND_GEN_S_REG(SRC_ROUTE_SEL,   0x00),
 391                 RSND_GEN_S_REG(SRC_TMG_SEL0,    0x08),
 392                 RSND_GEN_S_REG(SRC_TMG_SEL1,    0x0c),
 393                 RSND_GEN_S_REG(SRC_TMG_SEL2,    0x10),
 394                 RSND_GEN_S_REG(SRC_ROUTE_CTRL,  0xc0),
 395                 RSND_GEN_S_REG(SSI_MODE0,       0xD0),
 396                 RSND_GEN_S_REG(SSI_MODE1,       0xD4),
 397                 RSND_GEN_M_REG(SRC_BUSIF_MODE,  0x20,   0x4),
 398                 RSND_GEN_M_REG(SRC_ROUTE_MODE0, 0x50,   0x8),
 399                 RSND_GEN_M_REG(SRC_SWRSR,       0x200,  0x40),
 400                 RSND_GEN_M_REG(SRC_SRCIR,       0x204,  0x40),
 401                 RSND_GEN_M_REG(SRC_ADINR,       0x214,  0x40),
 402                 RSND_GEN_M_REG(SRC_IFSCR,       0x21c,  0x40),
 403                 RSND_GEN_M_REG(SRC_IFSVR,       0x220,  0x40),
 404                 RSND_GEN_M_REG(SRC_SRCCR,       0x224,  0x40),
 405                 RSND_GEN_M_REG(SRC_MNFSR,       0x228,  0x40),
 406         };
 407         struct rsnd_regmap_field_conf conf_adg[] = {
 408                 RSND_GEN_S_REG(BRRA,            0x00),
 409                 RSND_GEN_S_REG(BRRB,            0x04),
 410                 RSND_GEN_S_REG(SSICKR,          0x08),
 411                 RSND_GEN_S_REG(AUDIO_CLK_SEL0,  0x0c),
 412                 RSND_GEN_S_REG(AUDIO_CLK_SEL1,  0x10),
 413                 RSND_GEN_S_REG(AUDIO_CLK_SEL3,  0x18),
 414                 RSND_GEN_S_REG(AUDIO_CLK_SEL4,  0x1c),
 415                 RSND_GEN_S_REG(AUDIO_CLK_SEL5,  0x20),
 416         };
 417         struct rsnd_regmap_field_conf conf_ssi[] = {
 418                 RSND_GEN_M_REG(SSICR,           0x00,   0x40),
 419                 RSND_GEN_M_REG(SSISR,           0x04,   0x40),
 420                 RSND_GEN_M_REG(SSITDR,          0x08,   0x40),
 421                 RSND_GEN_M_REG(SSIRDR,          0x0c,   0x40),
 422                 RSND_GEN_M_REG(SSIWSR,          0x20,   0x40),
 423         };
 424         int ret_sru;
 425         int ret_adg;
 426         int ret_ssi;
 427
 428         ret_sru  = rsnd_gen_regmap_init(priv, 9, RSND_GEN1_SRU,  conf_sru);
 429         ret_adg  = rsnd_gen_regmap_init(priv, 9, RSND_GEN1_ADG,  conf_adg);
 430         ret_ssi  = rsnd_gen_regmap_init(priv, 9, RSND_GEN1_SSI,  conf_ssi);
 431         if (ret_sru  < 0 ||
 432             ret_adg  < 0 ||
 433             ret_ssi  < 0)
 434                 return ret_sru | ret_adg | ret_ssi;
 435
 436         dev_dbg(dev, "Gen1 is probed\n");
 437
 438         return 0;
 439 }
 440
 441 /*
 442  *              Gen
 443  */
 444 static void rsnd_of_parse_gen(struct platform_device *pdev,
 445                               const struct rsnd_of_data *of_data,
 446                               struct rsnd_priv *priv)
 447 {
 448         struct rcar_snd_info *info = priv->info;
 449
 450         if (!of_data)
 451                 return;
 452
 453         info->flags = of_data->flags;
 454 }
 455
 456 int rsnd_gen_probe(struct platform_device *pdev,
 457                    const struct rsnd_of_data *of_data,
 458                    struct rsnd_priv *priv)
 459 {
 460         struct device *dev = rsnd_priv_to_dev(priv);
 461         struct rsnd_gen *gen;
 462         int ret;
 463
 464         rsnd_of_parse_gen(pdev, of_data, priv);
 465
 466         gen = devm_kzalloc(dev, sizeof(*gen), GFP_KERNEL);
 467         if (!gen) {
 468                 dev_err(dev, "GEN allocate failed\n");
 469                 return -ENOMEM;
 470         }
 471
 472         priv->gen = gen;
 473
 474         ret = -ENODEV;
 475         if (rsnd_is_gen1(priv))
 476                 ret = rsnd_gen1_probe(pdev, priv);
 477         else if (rsnd_is_gen2(priv))
 478                 ret = rsnd_gen2_probe(pdev, priv);
 479
 480         if (ret < 0)
 481                 dev_err(dev, "unknown generation R-Car sound device\n");
 482
 483         return ret;
 484 }