sound/soc/sh/rcar/adg.c

   1 /*
   2  * Helper routines for R-Car sound ADG.
   3  *
   4  *  Copyright (C) 2013  Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #include <linux/clk-provider.h>
  11 #include "rsnd.h"
  12
  13 #define CLKA    0
  14 #define CLKB    1
  15 #define CLKC    2
  16 #define CLKI    3
  17 #define CLKMAX  4
  18
  19 #define CLKOUT  0
  20 #define CLKOUT1 1
  21 #define CLKOUT2 2
  22 #define CLKOUT3 3
  23 #define CLKOUTMAX 4
  24
  25 #define BRRx_MASK(x) (0x3FF & x)
  26
  27 static struct rsnd_mod_ops adg_ops = {
  28         .name = "adg",
  29 };
  30
  31 struct rsnd_adg {
  32         struct clk *clk[CLKMAX];
  33         struct clk *clkout[CLKOUTMAX];
  34         struct clk_onecell_data onecell;
  35         struct rsnd_mod mod;
  36         u32 flags;
  37         u32 ckr;
  38         u32 rbga;
  39         u32 rbgb;
  40
  41         int rbga_rate_for_441khz; /* RBGA */
  42         int rbgb_rate_for_48khz;  /* RBGB */
  43 };
  44
  45 #define LRCLK_ASYNC     (1 << 0)
  46 #define adg_mode_flags(adg)     (adg->flags)
  47
  48 #define for_each_rsnd_clk(pos, adg, i)          \
  49         for (i = 0;                             \
  50              (i < CLKMAX) &&                    \
  51              ((pos) = adg->clk[i]);             \
  52              i++)
  53 #define for_each_rsnd_clkout(pos, adg, i)       \
  54         for (i = 0;                             \
  55              (i < CLKOUTMAX) &&                 \
  56              ((pos) = adg->clkout[i]);  \
  57              i++)
  58 #define rsnd_priv_to_adg(priv) ((struct rsnd_adg *)(priv)->adg)
  59
  60 static u32 rsnd_adg_calculate_rbgx(unsigned long div)
  61 {
  62         int i, ratio;
  63
  64         if (!div)
  65                 return 0;
  66
  67         for (i = 3; i >= 0; i--) {
  68                 ratio = 2 << (i * 2);
  69                 if (0 == (div % ratio))
  70                         return (u32)((i << 8) | ((div / ratio) - 1));
  71         }
  72
  73         return ~0;
  74 }
  75
  76 static u32 rsnd_adg_ssi_ws_timing_gen2(struct rsnd_dai_stream *io)
  77 {
  78         struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
  79         int id = rsnd_mod_id(ssi_mod);
  80         int ws = id;
  81
  82         if (rsnd_ssi_is_pin_sharing(io)) {
  83                 switch (id) {
  84                 case 1:
  85                 case 2:
  86                         ws = 0;
  87                         break;
  88                 case 4:
  89                         ws = 3;
  90                         break;
  91                 case 8:
  92                         ws = 7;
  93                         break;
  94                 }
  95         }
  96
  97         return (0x6 + ws) << 8;
  98 }
  99
 100 static void __rsnd_adg_get_timesel_ratio(struct rsnd_priv *priv,
 101                                        struct rsnd_dai_stream *io,
 102                                        unsigned int target_rate,
 103                                        unsigned int *target_val,
 104                                        unsigned int *target_en)
 105 {
 106         struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
 107         struct device *dev = rsnd_priv_to_dev(priv);
 108         int idx, sel, div, step;
 109         unsigned int val, en;
 110         unsigned int min, diff;
 111         unsigned int sel_rate[] = {
 112                 clk_get_rate(adg->clk[CLKA]),   /* 0000: CLKA */
 113                 clk_get_rate(adg->clk[CLKB]),   /* 0001: CLKB */
 114                 clk_get_rate(adg->clk[CLKC]),   /* 0010: CLKC */
 115                 adg->rbga_rate_for_441khz,      /* 0011: RBGA */
 116                 adg->rbgb_rate_for_48khz,       /* 0100: RBGB */
 117         };
 118
 119         min = ~0;
 120         val = 0;
 121         en = 0;
 122         for (sel = 0; sel < ARRAY_SIZE(sel_rate); sel++) {
 123                 idx = 0;
 124                 step = 2;
 125
 126                 if (!sel_rate[sel])
 127                         continue;
 128
 129                 for (div = 2; div <= 98304; div += step) {
 130                         diff = abs(target_rate - sel_rate[sel] / div);
 131                         if (min > diff) {
 132                                 val = (sel << 8) | idx;
 133                                 min = diff;
 134                                 en = 1 << (sel + 1); /* fixme */
 135                         }
 136
 137                         /*
 138                          * step of 0_0000 / 0_0001 / 0_1101
 139                          * are out of order
 140                          */
 141                         if ((idx > 2) && (idx % 2))
 142                                 step *= 2;
 143                         if (idx == 0x1c) {
 144                                 div += step;
 145                                 step *= 2;
 146                         }
 147                         idx++;
 148                 }
 149         }
 150
 151         if (min == ~0) {
 152                 dev_err(dev, "no Input clock\n");
 153                 return;
 154         }
 155
 156         *target_val = val;
 157         if (target_en)
 158                 *target_en = en;
 159 }
 160
 161 static void rsnd_adg_get_timesel_ratio(struct rsnd_priv *priv,
 162                                        struct rsnd_dai_stream *io,
 163                                        unsigned int in_rate,
 164                                        unsigned int out_rate,
 165                                        u32 *in, u32 *out, u32 *en)
 166 {
 167         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 168         unsigned int target_rate;
 169         u32 *target_val;
 170         u32 _in;
 171         u32 _out;
 172         u32 _en;
 173
 174         /* default = SSI WS */
 175         _in =
 176         _out = rsnd_adg_ssi_ws_timing_gen2(io);
 177
 178         target_rate = 0;
 179         target_val = NULL;
 180         _en = 0;
 181         if (runtime->rate != in_rate) {
 182                 target_rate = out_rate;
 183                 target_val  = &_out;
 184         } else if (runtime->rate != out_rate) {
 185                 target_rate = in_rate;
 186                 target_val  = &_in;
 187         }
 188
 189         if (target_rate)
 190                 __rsnd_adg_get_timesel_ratio(priv, io,
 191                                              target_rate,
 192                                              target_val, &_en);
 193
 194         if (in)
 195                 *in = _in;
 196         if (out)
 197                 *out = _out;
 198         if (en)
 199                 *en = _en;
 200 }
 201
 202 int rsnd_adg_set_cmd_timsel_gen2(struct rsnd_mod *cmd_mod,
 203                                  struct rsnd_dai_stream *io)
 204 {
 205         struct rsnd_priv *priv = rsnd_mod_to_priv(cmd_mod);
 206         struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
 207         struct rsnd_mod *adg_mod = rsnd_mod_get(adg);
 208         int id = rsnd_mod_id(cmd_mod);
 209         int shift = (id % 2) ? 16 : 0;
 210         u32 mask, val;
 211
 212         rsnd_adg_get_timesel_ratio(priv, io,
 213                                    rsnd_src_get_in_rate(priv, io),
 214                                    rsnd_src_get_out_rate(priv, io),
 215                                    NULL, &val, NULL);
 216
 217         val  = val      << shift;
 218         mask = 0xffff   << shift;
 219
 220         rsnd_mod_bset(adg_mod, CMDOUT_TIMSEL, mask, val);
 221
 222         return 0;
 223 }
 224
 225 int rsnd_adg_set_src_timesel_gen2(struct rsnd_mod *src_mod,
 226                                   struct rsnd_dai_stream *io,
 227                                   unsigned int in_rate,
 228                                   unsigned int out_rate)
 229 {
 230         struct rsnd_priv *priv = rsnd_mod_to_priv(src_mod);
 231         struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
 232         struct rsnd_mod *adg_mod = rsnd_mod_get(adg);
 233         u32 in, out;
 234         u32 mask, en;
 235         int id = rsnd_mod_id(src_mod);
 236         int shift = (id % 2) ? 16 : 0;
 237
 238         rsnd_mod_confirm_src(src_mod);
 239
 240         rsnd_adg_get_timesel_ratio(priv, io,
 241                                    in_rate, out_rate,
 242                                    &in, &out, &en);
 243
 244         in   = in       << shift;
 245         out  = out      << shift;
 246         mask = 0xffff   << shift;
 247
 248         switch (id / 2) {
 249         case 0:
 250                 rsnd_mod_bset(adg_mod, SRCIN_TIMSEL0,  mask, in);
 251                 rsnd_mod_bset(adg_mod, SRCOUT_TIMSEL0, mask, out);
 252                 break;
 253         case 1:
 254                 rsnd_mod_bset(adg_mod, SRCIN_TIMSEL1,  mask, in);
 255                 rsnd_mod_bset(adg_mod, SRCOUT_TIMSEL1, mask, out);
 256                 break;
 257         case 2:
 258                 rsnd_mod_bset(adg_mod, SRCIN_TIMSEL2,  mask, in);
 259                 rsnd_mod_bset(adg_mod, SRCOUT_TIMSEL2, mask, out);
 260                 break;
 261         case 3:
 262                 rsnd_mod_bset(adg_mod, SRCIN_TIMSEL3,  mask, in);
 263                 rsnd_mod_bset(adg_mod, SRCOUT_TIMSEL3, mask, out);
 264                 break;
 265         case 4:
 266                 rsnd_mod_bset(adg_mod, SRCIN_TIMSEL4,  mask, in);
 267                 rsnd_mod_bset(adg_mod, SRCOUT_TIMSEL4, mask, out);
 268                 break;
 269         }
 270
 271         if (en)
 272                 rsnd_mod_bset(adg_mod, DIV_EN, en, en);
 273
 274         return 0;
 275 }
 276
 277 static void rsnd_adg_set_ssi_clk(struct rsnd_mod *ssi_mod, u32 val)
 278 {
 279         struct rsnd_priv *priv = rsnd_mod_to_priv(ssi_mod);
 280         struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
 281         struct rsnd_mod *adg_mod = rsnd_mod_get(adg);
 282         int id = rsnd_mod_id(ssi_mod);
 283         int shift = (id % 4) * 8;
 284         u32 mask = 0xFF << shift;
 285
 286         rsnd_mod_confirm_ssi(ssi_mod);
 287
 288         val = val << shift;
 289
 290         /*
 291          * SSI 8 is not connected to ADG.
 292          * it works with SSI 7
 293          */
 294         if (id == 8)
 295                 return;
 296
 297         switch (id / 4) {
 298         case 0:
 299                 rsnd_mod_bset(adg_mod, AUDIO_CLK_SEL0, mask, val);
 300                 break;
 301         case 1:
 302                 rsnd_mod_bset(adg_mod, AUDIO_CLK_SEL1, mask, val);
 303                 break;
 304         case 2:
 305                 rsnd_mod_bset(adg_mod, AUDIO_CLK_SEL2, mask, val);
 306                 break;
 307         }
 308 }
 309
 310 int rsnd_adg_ssi_clk_stop(struct rsnd_mod *ssi_mod)
 311 {
 312         rsnd_adg_set_ssi_clk(ssi_mod, 0);
 313
 314         return 0;
 315 }
 316
 317 int rsnd_adg_ssi_clk_try_start(struct rsnd_mod *ssi_mod, unsigned int rate)
 318 {
 319         struct rsnd_priv *priv = rsnd_mod_to_priv(ssi_mod);
 320         struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
 321         struct device *dev = rsnd_priv_to_dev(priv);
 322         struct rsnd_mod *adg_mod = rsnd_mod_get(adg);
 323         struct clk *clk;
 324         int i;
 325         u32 data;
 326         u32 ckr = 0;
 327         int sel_table[] = {
 328                 [CLKA] = 0x1,
 329                 [CLKB] = 0x2,
 330                 [CLKC] = 0x3,
 331                 [CLKI] = 0x0,
 332         };
 333
 334         dev_dbg(dev, "request clock = %d\n", rate);
 335
 336         /*
 337          * find suitable clock from
 338          * AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC/AUDIO_CLKI.
 339          */
 340         data = 0;
 341         for_each_rsnd_clk(clk, adg, i) {
 342                 if (rate == clk_get_rate(clk)) {
 343                         data = sel_table[i];
 344                         goto found_clock;
 345                 }
 346         }
 347
 348         /*
 349          * find divided clock from BRGA/BRGB
 350          */
 351         if (rate  == adg->rbga_rate_for_441khz) {
 352                 data = 0x10;
 353                 goto found_clock;
 354         }
 355
 356         if (rate == adg->rbgb_rate_for_48khz) {
 357                 data = 0x20;
 358                 goto found_clock;
 359         }
 360
 361         return -EIO;
 362
 363 found_clock:
 364
 365         rsnd_adg_set_ssi_clk(ssi_mod, data);
 366
 367         if (!(adg_mode_flags(adg) & LRCLK_ASYNC)) {
 368                 if (0 == (rate % 8000))
 369                         ckr = 0x80000000;
 370         }
 371
 372         rsnd_mod_bset(adg_mod, BRGCKR, 0x80FF0000, adg->ckr | ckr);
 373         rsnd_mod_write(adg_mod, BRRA,  adg->rbga);
 374         rsnd_mod_write(adg_mod, BRRB,  adg->rbgb);
 375
 376         dev_dbg(dev, "ADG: %s[%d] selects 0x%x for %d\n",
 377                 rsnd_mod_name(ssi_mod), rsnd_mod_id(ssi_mod),
 378                 data, rate);
 379
 380         return 0;
 381 }
 382
 383 void rsnd_adg_clk_control(struct rsnd_priv *priv, int enable)
 384 {
 385         struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
 386         struct device *dev = rsnd_priv_to_dev(priv);
 387         struct clk *clk;
 388         int i, ret;
 389
 390         for_each_rsnd_clk(clk, adg, i) {
 391                 ret = 0;
 392                 if (enable)
 393                         ret = clk_prepare_enable(clk);
 394                 else
 395                         clk_disable_unprepare(clk);
 396
 397                 if (ret < 0)
 398                         dev_warn(dev, "can't use clk %d\n", i);
 399         }
 400 }
 401
 402 static void rsnd_adg_get_clkin(struct rsnd_priv *priv,
 403                                struct rsnd_adg *adg)
 404 {
 405         struct device *dev = rsnd_priv_to_dev(priv);
 406         struct clk *clk;
 407         static const char * const clk_name[] = {
 408                 [CLKA]  = "clk_a",
 409                 [CLKB]  = "clk_b",
 410                 [CLKC]  = "clk_c",
 411                 [CLKI]  = "clk_i",
 412         };
 413         int i;
 414
 415         for (i = 0; i < CLKMAX; i++) {
 416                 clk = devm_clk_get(dev, clk_name[i]);
 417                 adg->clk[i] = IS_ERR(clk) ? NULL : clk;
 418         }
 419
 420         for_each_rsnd_clk(clk, adg, i)
 421                 dev_dbg(dev, "clk %d : %p : %ld\n", i, clk, clk_get_rate(clk));
 422 }
 423
 424 static void rsnd_adg_get_clkout(struct rsnd_priv *priv,
 425                                 struct rsnd_adg *adg)
 426 {
 427         struct clk *clk;
 428         struct device *dev = rsnd_priv_to_dev(priv);
 429         struct device_node *np = dev->of_node;
 430         u32 ckr, rbgx, rbga, rbgb;
 431         u32 rate, req_rate = 0, div;
 432         uint32_t count = 0;
 433         unsigned long req_48kHz_rate, req_441kHz_rate;
 434         int i;
 435         const char *parent_clk_name = NULL;
 436         static const char * const clkout_name[] = {
 437                 [CLKOUT]  = "audio_clkout",
 438                 [CLKOUT1] = "audio_clkout1",
 439                 [CLKOUT2] = "audio_clkout2",
 440                 [CLKOUT3] = "audio_clkout3",
 441         };
 442         int brg_table[] = {
 443                 [CLKA] = 0x0,
 444                 [CLKB] = 0x1,
 445                 [CLKC] = 0x4,
 446                 [CLKI] = 0x2,
 447         };
 448
 449         of_property_read_u32(np, "#clock-cells", &count);
 450
 451         /*
 452          * ADG supports BRRA/BRRB output only
 453          * this means all clkout0/1/2/3 will be same rate
 454          */
 455         of_property_read_u32(np, "clock-frequency", &req_rate);
 456         req_48kHz_rate = 0;
 457         req_441kHz_rate = 0;
 458         if (0 == (req_rate % 44100))
 459                 req_441kHz_rate = req_rate;
 460         if (0 == (req_rate % 48000))
 461                 req_48kHz_rate = req_rate;
 462
 463         /*
 464          * This driver is assuming that AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC
 465          * have 44.1kHz or 48kHz base clocks for now.
 466          *
 467          * SSI itself can divide parent clock by 1/1 - 1/16
 468          * see
 469          *      rsnd_adg_ssi_clk_try_start()
 470          *      rsnd_ssi_master_clk_start()
 471          */
 472         ckr = 0;
 473         rbga = 2; /* default 1/6 */
 474         rbgb = 2; /* default 1/6 */
 475         adg->rbga_rate_for_441khz       = 0;
 476         adg->rbgb_rate_for_48khz        = 0;
 477         for_each_rsnd_clk(clk, adg, i) {
 478                 rate = clk_get_rate(clk);
 479
 480                 if (0 == rate) /* not used */
 481                         continue;
 482
 483                 /* RBGA */
 484                 if (!adg->rbga_rate_for_441khz && (0 == rate % 44100)) {
 485                         div = 6;
 486                         if (req_441kHz_rate)
 487                                 div = rate / req_441kHz_rate;
 488                         rbgx = rsnd_adg_calculate_rbgx(div);
 489                         if (BRRx_MASK(rbgx) == rbgx) {
 490                                 rbga = rbgx;
 491                                 adg->rbga_rate_for_441khz = rate / div;
 492                                 ckr |= brg_table[i] << 20;
 493                                 if (req_441kHz_rate)
 494                                         parent_clk_name = __clk_get_name(clk);
 495                         }
 496                 }
 497
 498                 /* RBGB */
 499                 if (!adg->rbgb_rate_for_48khz && (0 == rate % 48000)) {
 500                         div = 6;
 501                         if (req_48kHz_rate)
 502                                 div = rate / req_48kHz_rate;
 503                         rbgx = rsnd_adg_calculate_rbgx(div);
 504                         if (BRRx_MASK(rbgx) == rbgx) {
 505                                 rbgb = rbgx;
 506                                 adg->rbgb_rate_for_48khz = rate / div;
 507                                 ckr |= brg_table[i] << 16;
 508                                 if (req_48kHz_rate) {
 509                                         parent_clk_name = __clk_get_name(clk);
 510                                         ckr |= 0x80000000;
 511                                 }
 512                         }
 513                 }
 514         }
 515
 516         /*
 517          * ADG supports BRRA/BRRB output only.
 518          * this means all clkout0/1/2/3 will be * same rate
 519          */
 520
 521         /*
 522          * for clkout
 523          */
 524         if (!count) {
 525                 clk = clk_register_fixed_rate(dev, clkout_name[CLKOUT],
 526                                               parent_clk_name, 0, req_rate);
 527                 if (!IS_ERR(clk)) {
 528                         adg->clkout[CLKOUT] = clk;
 529                         of_clk_add_provider(np, of_clk_src_simple_get, clk);
 530                 }
 531         }
 532         /*
 533          * for clkout0/1/2/3
 534          */
 535         else {
 536                 for (i = 0; i < CLKOUTMAX; i++) {
 537                         clk = clk_register_fixed_rate(dev, clkout_name[i],
 538                                                       parent_clk_name, 0,
 539                                                       req_rate);
 540                         if (!IS_ERR(clk)) {
 541                                 adg->onecell.clks       = adg->clkout;
 542                                 adg->onecell.clk_num    = CLKOUTMAX;
 543
 544                                 adg->clkout[i] = clk;
 545
 546                                 of_clk_add_provider(np, of_clk_src_onecell_get,
 547                                                     &adg->onecell);
 548                         }
 549                 }
 550         }
 551
 552         adg->ckr = ckr;
 553         adg->rbga = rbga;
 554         adg->rbgb = rbgb;
 555
 556         for_each_rsnd_clkout(clk, adg, i)
 557                 dev_dbg(dev, "clkout %d : %p : %ld\n", i, clk, clk_get_rate(clk));
 558         dev_dbg(dev, "BRGCKR = 0x%08x, BRRA/BRRB = 0x%x/0x%x\n",
 559                 ckr, rbga, rbgb);
 560 }
 561
 562 int rsnd_adg_probe(struct rsnd_priv *priv)
 563 {
 564         struct rsnd_adg *adg;
 565         struct device *dev = rsnd_priv_to_dev(priv);
 566         struct device_node *np = dev->of_node;
 567
 568         adg = devm_kzalloc(dev, sizeof(*adg), GFP_KERNEL);
 569         if (!adg) {
 570                 dev_err(dev, "ADG allocate failed\n");
 571                 return -ENOMEM;
 572         }
 573
 574         rsnd_mod_init(priv, &adg->mod, &adg_ops,
 575                       NULL, NULL, 0, 0);
 576
 577         rsnd_adg_get_clkin(priv, adg);
 578         rsnd_adg_get_clkout(priv, adg);
 579
 580         if (of_get_property(np, "clkout-lr-asynchronous", NULL))
 581                 adg->flags = LRCLK_ASYNC;
 582
 583         priv->adg = adg;
 584
 585         rsnd_adg_clk_enable(priv);
 586
 587         return 0;
 588 }
 589
 590 void rsnd_adg_remove(struct rsnd_priv *priv)
 591 {
 592         rsnd_adg_clk_disable(priv);
 593 }