drivers/clk/renesas/clk-rcar-gen3.c

   1 /*
   2  * Renesas RCar Gen3 CPG MSSR driver
   3  *
   4  * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
   5  *
   6  * Based on the following driver from Linux kernel:
   7  * r8a7796 Clock Pulse Generator / Module Standby and Software Reset
   8  *
   9  * Copyright (C) 2016 Glider bvba
  10  *
  11  * SPDX-License-Identifier:     GPL-2.0+
  12  */
  13
  14 #include <common.h>
  15 #include <clk-uclass.h>
  16 #include <dm.h>
  17 #include <errno.h>
  18 #include <wait_bit.h>
  19 #include <asm/io.h>
  20
  21 #include <dt-bindings/clock/renesas-cpg-mssr.h>
  22
  23 #include "renesas-cpg-mssr.h"
  24
  25 #define CPG_RST_MODEMR          0x0060
  26
  27 #define CPG_PLL0CR              0x00d8
  28 #define CPG_PLL2CR              0x002c
  29 #define CPG_PLL4CR              0x01f4
  30
  31 #define CPG_RPC_PREDIV_MASK     0x3
  32 #define CPG_RPC_PREDIV_OFFSET   3
  33 #define CPG_RPC_POSTDIV_MASK    0x7
  34 #define CPG_RPC_POSTDIV_OFFSET  0
  35
  36 /*
  37  * Module Standby and Software Reset register offets.
  38  *
  39  * If the registers exist, these are valid for SH-Mobile, R-Mobile,
  40  * R-Car Gen2, R-Car Gen3, and RZ/G1.
  41  * These are NOT valid for R-Car Gen1 and RZ/A1!
  42  */
  43
  44 /*
  45  * Module Stop Status Register offsets
  46  */
  47
  48 static const u16 mstpsr[] = {
  49         0x030, 0x038, 0x040, 0x048, 0x04C, 0x03C, 0x1C0, 0x1C4,
  50         0x9A0, 0x9A4, 0x9A8, 0x9AC,
  51 };
  52
  53 #define MSTPSR(i)       mstpsr[i]
  54
  55
  56 /*
  57  * System Module Stop Control Register offsets
  58  */
  59
  60 static const u16 smstpcr[] = {
  61         0x130, 0x134, 0x138, 0x13C, 0x140, 0x144, 0x148, 0x14C,
  62         0x990, 0x994, 0x998, 0x99C,
  63 };
  64
  65 #define SMSTPCR(i)      smstpcr[i]
  66
  67
  68 /* Realtime Module Stop Control Register offsets */
  69 #define RMSTPCR(i)      (smstpcr[i] - 0x20)
  70
  71 /* Modem Module Stop Control Register offsets (r8a73a4) */
  72 #define MMSTPCR(i)      (smstpcr[i] + 0x20)
  73
  74 /* Software Reset Clearing Register offsets */
  75 #define SRSTCLR(i)      (0x940 + (i) * 4)
  76
  77 /*
  78  * CPG Clock Data
  79  */
  80
  81 /*
  82  *   MD         EXTAL           PLL0    PLL1    PLL2    PLL3    PLL4
  83  * 14 13 19 17  (MHz)
  84  *-------------------------------------------------------------------
  85  * 0  0  0  0   16.66 x 1       x180    x192    x144    x192    x144
  86  * 0  0  0  1   16.66 x 1       x180    x192    x144    x128    x144
  87  * 0  0  1  0   Prohibited setting
  88  * 0  0  1  1   16.66 x 1       x180    x192    x144    x192    x144
  89  * 0  1  0  0   20    x 1       x150    x160    x120    x160    x120
  90  * 0  1  0  1   20    x 1       x150    x160    x120    x106    x120
  91  * 0  1  1  0   Prohibited setting
  92  * 0  1  1  1   20    x 1       x150    x160    x120    x160    x120
  93  * 1  0  0  0   25    x 1       x120    x128    x96     x128    x96
  94  * 1  0  0  1   25    x 1       x120    x128    x96     x84     x96
  95  * 1  0  1  0   Prohibited setting
  96  * 1  0  1  1   25    x 1       x120    x128    x96     x128    x96
  97  * 1  1  0  0   33.33 / 2       x180    x192    x144    x192    x144
  98  * 1  1  0  1   33.33 / 2       x180    x192    x144    x128    x144
  99  * 1  1  1  0   Prohibited setting
 100  * 1  1  1  1   33.33 / 2       x180    x192    x144    x192    x144
 101  */
 102 #define CPG_PLL_CONFIG_INDEX(md)        ((((md) & BIT(14)) >> 11) | \
 103                                          (((md) & BIT(13)) >> 11) | \
 104                                          (((md) & BIT(19)) >> 18) | \
 105                                          (((md) & BIT(17)) >> 17))
 106
 107 static const struct rcar_gen3_cpg_pll_config cpg_pll_configs[16] = {
 108         /* EXTAL div    PLL1 mult       PLL3 mult */
 109         { 1,            192,            192,    },
 110         { 1,            192,            128,    },
 111         { 0, /* Prohibited setting */           },
 112         { 1,            192,            192,    },
 113         { 1,            160,            160,    },
 114         { 1,            160,            106,    },
 115         { 0, /* Prohibited setting */           },
 116         { 1,            160,            160,    },
 117         { 1,            128,            128,    },
 118         { 1,            128,            84,     },
 119         { 0, /* Prohibited setting */           },
 120         { 1,            128,            128,    },
 121         { 2,            192,            192,    },
 122         { 2,            192,            128,    },
 123         { 0, /* Prohibited setting */           },
 124         { 2,            192,            192,    },
 125 };
 126
 127 /*
 128  * SDn Clock
 129  */
 130 #define CPG_SD_STP_HCK          BIT(9)
 131 #define CPG_SD_STP_CK           BIT(8)
 132
 133 #define CPG_SD_STP_MASK         (CPG_SD_STP_HCK | CPG_SD_STP_CK)
 134 #define CPG_SD_FC_MASK          (0x7 << 2 | 0x3 << 0)
 135
 136 #define CPG_SD_DIV_TABLE_DATA(stp_hck, stp_ck, sd_srcfc, sd_fc, sd_div) \
 137 { \
 138         .val = ((stp_hck) ? CPG_SD_STP_HCK : 0) | \
 139                ((stp_ck) ? CPG_SD_STP_CK : 0) | \
 140                ((sd_srcfc) << 2) | \
 141                ((sd_fc) << 0), \
 142         .div = (sd_div), \
 143 }
 144
 145 struct sd_div_table {
 146         u32 val;
 147         unsigned int div;
 148 };
 149
 150 /* SDn divider
 151  *                     sd_srcfc   sd_fc   div
 152  * stp_hck   stp_ck    (div)      (div)     = sd_srcfc x sd_fc
 153  *-------------------------------------------------------------------
 154  *  0         0         0 (1)      1 (4)      4
 155  *  0         0         1 (2)      1 (4)      8
 156  *  1         0         2 (4)      1 (4)     16
 157  *  1         0         3 (8)      1 (4)     32
 158  *  1         0         4 (16)     1 (4)     64
 159  *  0         0         0 (1)      0 (2)      2
 160  *  0         0         1 (2)      0 (2)      4
 161  *  1         0         2 (4)      0 (2)      8
 162  *  1         0         3 (8)      0 (2)     16
 163  *  1         0         4 (16)     0 (2)     32
 164  */
 165 static const struct sd_div_table cpg_sd_div_table[] = {
 166 /*      CPG_SD_DIV_TABLE_DATA(stp_hck,  stp_ck,   sd_srcfc,   sd_fc,  sd_div) */
 167         CPG_SD_DIV_TABLE_DATA(0,        0,        0,          1,        4),
 168         CPG_SD_DIV_TABLE_DATA(0,        0,        1,          1,        8),
 169         CPG_SD_DIV_TABLE_DATA(1,        0,        2,          1,       16),
 170         CPG_SD_DIV_TABLE_DATA(1,        0,        3,          1,       32),
 171         CPG_SD_DIV_TABLE_DATA(1,        0,        4,          1,       64),
 172         CPG_SD_DIV_TABLE_DATA(0,        0,        0,          0,        2),
 173         CPG_SD_DIV_TABLE_DATA(0,        0,        1,          0,        4),
 174         CPG_SD_DIV_TABLE_DATA(1,        0,        2,          0,        8),
 175         CPG_SD_DIV_TABLE_DATA(1,        0,        3,          0,       16),
 176         CPG_SD_DIV_TABLE_DATA(1,        0,        4,          0,       32),
 177 };
 178
 179 static bool gen3_clk_is_mod(struct clk *clk)
 180 {
 181         return (clk->id >> 16) == CPG_MOD;
 182 }
 183
 184 static int gen3_clk_get_mod(struct clk *clk, const struct mssr_mod_clk **mssr)
 185 {
 186         struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
 187         struct cpg_mssr_info *info = priv->info;
 188         const unsigned long clkid = clk->id & 0xffff;
 189         int i;
 190
 191         if (!gen3_clk_is_mod(clk))
 192                 return -EINVAL;
 193
 194         for (i = 0; i < info->mod_clk_size; i++) {
 195                 if (info->mod_clk[i].id != MOD_CLK_ID(clkid))
 196                         continue;
 197
 198                 *mssr = &info->mod_clk[i];
 199                 return 0;
 200         }
 201
 202         return -ENODEV;
 203 }
 204
 205 static int gen3_clk_get_core(struct clk *clk, const struct cpg_core_clk **core)
 206 {
 207         struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
 208         struct cpg_mssr_info *info = priv->info;
 209         const unsigned long clkid = clk->id & 0xffff;
 210         int i;
 211
 212         if (gen3_clk_is_mod(clk))
 213                 return -EINVAL;
 214
 215         for (i = 0; i < info->core_clk_size; i++) {
 216                 if (info->core_clk[i].id != clkid)
 217                         continue;
 218
 219                 *core = &info->core_clk[i];
 220                 return 0;
 221         }
 222
 223         return -ENODEV;
 224 }
 225
 226 static int gen3_clk_get_parent(struct clk *clk, struct clk *parent)
 227 {
 228         const struct cpg_core_clk *core;
 229         const struct mssr_mod_clk *mssr;
 230         int ret;
 231
 232         if (gen3_clk_is_mod(clk)) {
 233                 ret = gen3_clk_get_mod(clk, &mssr);
 234                 if (ret)
 235                         return ret;
 236
 237                 parent->id = mssr->parent;
 238         } else {
 239                 ret = gen3_clk_get_core(clk, &core);
 240                 if (ret)
 241                         return ret;
 242
 243                 if (core->type == CLK_TYPE_IN)
 244                         parent->id = ~0;        /* Top-level clock */
 245                 else
 246                         parent->id = core->parent;
 247         }
 248
 249         parent->dev = clk->dev;
 250
 251         return 0;
 252 }
 253
 254 static int gen3_clk_setup_sdif_div(struct clk *clk)
 255 {
 256         struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
 257         const struct cpg_core_clk *core;
 258         struct clk parent;
 259         int ret;
 260
 261         ret = gen3_clk_get_parent(clk, &parent);
 262         if (ret) {
 263                 printf("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
 264                 return ret;
 265         }
 266
 267         if (gen3_clk_is_mod(&parent))
 268                 return 0;
 269
 270         ret = gen3_clk_get_core(&parent, &core);
 271         if (ret)
 272                 return ret;
 273
 274         if (core->type != CLK_TYPE_GEN3_SD)
 275                 return 0;
 276
 277         debug("%s[%i] SDIF offset=%x\n", __func__, __LINE__, core->offset);
 278
 279         writel(1, priv->base + core->offset);
 280
 281         return 0;
 282 }
 283
 284 static int gen3_clk_endisable(struct clk *clk, bool enable)
 285 {
 286         struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
 287         const unsigned long clkid = clk->id & 0xffff;
 288         const unsigned int reg = clkid / 100;
 289         const unsigned int bit = clkid % 100;
 290         const u32 bitmask = BIT(bit);
 291         int ret;
 292
 293         if (!gen3_clk_is_mod(clk))
 294                 return -EINVAL;
 295
 296         debug("%s[%i] MSTP %lu=%02u/%02u %s\n", __func__, __LINE__,
 297               clkid, reg, bit, enable ? "ON" : "OFF");
 298
 299         if (enable) {
 300                 ret = gen3_clk_setup_sdif_div(clk);
 301                 if (ret)
 302                         return ret;
 303                 clrbits_le32(priv->base + SMSTPCR(reg), bitmask);
 304                 return wait_for_bit("MSTP", priv->base + MSTPSR(reg),
 305                                     bitmask, 0, 100, 0);
 306         } else {
 307                 setbits_le32(priv->base + SMSTPCR(reg), bitmask);
 308                 return 0;
 309         }
 310 }
 311
 312 static int gen3_clk_enable(struct clk *clk)
 313 {
 314         return gen3_clk_endisable(clk, true);
 315 }
 316
 317 static int gen3_clk_disable(struct clk *clk)
 318 {
 319         return gen3_clk_endisable(clk, false);
 320 }
 321
 322 static ulong gen3_clk_get_rate(struct clk *clk)
 323 {
 324         struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
 325         struct clk parent;
 326         const struct cpg_core_clk *core;
 327         const struct rcar_gen3_cpg_pll_config *pll_config =
 328                                         priv->cpg_pll_config;
 329         u32 value, mult, prediv, postdiv, rate = 0;
 330         int i, ret;
 331
 332         debug("%s[%i] Clock: id=%lu\n", __func__, __LINE__, clk->id);
 333
 334         ret = gen3_clk_get_parent(clk, &parent);
 335         if (ret) {
 336                 printf("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
 337                 return ret;
 338         }
 339
 340         if (gen3_clk_is_mod(clk)) {
 341                 rate = gen3_clk_get_rate(&parent);
 342                 debug("%s[%i] MOD clk: parent=%lu => rate=%u\n",
 343                       __func__, __LINE__, parent.id, rate);
 344                 return rate;
 345         }
 346
 347         ret = gen3_clk_get_core(clk, &core);
 348         if (ret)
 349                 return ret;
 350
 351         switch (core->type) {
 352         case CLK_TYPE_IN:
 353                 if (core->id == CLK_EXTAL) {
 354                         rate = clk_get_rate(&priv->clk_extal);
 355                         debug("%s[%i] EXTAL clk: rate=%u\n",
 356                               __func__, __LINE__, rate);
 357                         return rate;
 358                 }
 359
 360                 if (core->id == CLK_EXTALR) {
 361                         rate = clk_get_rate(&priv->clk_extalr);
 362                         debug("%s[%i] EXTALR clk: rate=%u\n",
 363                               __func__, __LINE__, rate);
 364                         return rate;
 365                 }
 366
 367                 return -EINVAL;
 368
 369         case CLK_TYPE_GEN3_MAIN:
 370                 rate = gen3_clk_get_rate(&parent) / pll_config->extal_div;
 371                 debug("%s[%i] MAIN clk: parent=%i extal_div=%i => rate=%u\n",
 372                       __func__, __LINE__,
 373                       core->parent, pll_config->extal_div, rate);
 374                 return rate;
 375
 376         case CLK_TYPE_GEN3_PLL0:
 377                 value = readl(priv->base + CPG_PLL0CR);
 378                 mult = (((value >> 24) & 0x7f) + 1) * 2;
 379                 rate = gen3_clk_get_rate(&parent) * mult;
 380                 debug("%s[%i] PLL0 clk: parent=%i mult=%u => rate=%u\n",
 381                       __func__, __LINE__, core->parent, mult, rate);
 382                 return rate;
 383
 384         case CLK_TYPE_GEN3_PLL1:
 385                 rate = gen3_clk_get_rate(&parent) * pll_config->pll1_mult;
 386                 debug("%s[%i] PLL1 clk: parent=%i mul=%i => rate=%u\n",
 387                       __func__, __LINE__,
 388                       core->parent, pll_config->pll1_mult, rate);
 389                 return rate;
 390
 391         case CLK_TYPE_GEN3_PLL2:
 392                 value = readl(priv->base + CPG_PLL2CR);
 393                 mult = (((value >> 24) & 0x7f) + 1) * 2;
 394                 rate = gen3_clk_get_rate(&parent) * mult;
 395                 debug("%s[%i] PLL2 clk: parent=%i mult=%u => rate=%u\n",
 396                       __func__, __LINE__, core->parent, mult, rate);
 397                 return rate;
 398
 399         case CLK_TYPE_GEN3_PLL3:
 400                 rate = gen3_clk_get_rate(&parent) * pll_config->pll3_mult;
 401                 debug("%s[%i] PLL3 clk: parent=%i mul=%i => rate=%u\n",
 402                       __func__, __LINE__,
 403                       core->parent, pll_config->pll3_mult, rate);
 404                 return rate;
 405
 406         case CLK_TYPE_GEN3_PLL4:
 407                 value = readl(priv->base + CPG_PLL4CR);
 408                 mult = (((value >> 24) & 0x7f) + 1) * 2;
 409                 rate = gen3_clk_get_rate(&parent) * mult;
 410                 debug("%s[%i] PLL4 clk: parent=%i mult=%u => rate=%u\n",
 411                       __func__, __LINE__, core->parent, mult, rate);
 412                 return rate;
 413
 414         case CLK_TYPE_FF:
 415         case CLK_TYPE_GEN3_PE:          /* FIXME */
 416                 rate = (gen3_clk_get_rate(&parent) * core->mult) / core->div;
 417                 debug("%s[%i] FIXED clk: parent=%i div=%i mul=%i => rate=%u\n",
 418                       __func__, __LINE__,
 419                       core->parent, core->mult, core->div, rate);
 420                 return rate;
 421
 422         case CLK_TYPE_GEN3_SD:          /* FIXME */
 423                 value = readl(priv->base + core->offset);
 424                 value &= CPG_SD_STP_MASK | CPG_SD_FC_MASK;
 425
 426                 for (i = 0; i < ARRAY_SIZE(cpg_sd_div_table); i++) {
 427                         if (cpg_sd_div_table[i].val != value)
 428                                 continue;
 429
 430                         rate = gen3_clk_get_rate(&parent) /
 431                                cpg_sd_div_table[i].div;
 432                         debug("%s[%i] SD clk: parent=%i div=%i => rate=%u\n",
 433                               __func__, __LINE__,
 434                               core->parent, cpg_sd_div_table[i].div, rate);
 435
 436                         return rate;
 437                 }
 438
 439                 return -EINVAL;
 440
 441         case CLK_TYPE_GEN3_RPC:
 442                 rate = gen3_clk_get_rate(&parent);
 443
 444                 value = readl(priv->base + core->offset);
 445
 446                 prediv = (value >> CPG_RPC_PREDIV_OFFSET) &
 447                          CPG_RPC_PREDIV_MASK;
 448                 if (prediv == 2)
 449                         rate /= 5;
 450                 else if (prediv == 3)
 451                         rate /= 6;
 452                 else
 453                         return -EINVAL;
 454
 455                 postdiv = (value >> CPG_RPC_POSTDIV_OFFSET) &
 456                           CPG_RPC_POSTDIV_MASK;
 457                 rate /= postdiv + 1;
 458
 459                 debug("%s[%i] RPC clk: parent=%i prediv=%i postdiv=%i => rate=%u\n",
 460                       __func__, __LINE__,
 461                       core->parent, prediv, postdiv, rate);
 462
 463                 return -EINVAL;
 464
 465         }
 466
 467         printf("%s[%i] unknown fail\n", __func__, __LINE__);
 468
 469         return -ENOENT;
 470 }
 471
 472 static ulong gen3_clk_set_rate(struct clk *clk, ulong rate)
 473 {
 474         return gen3_clk_get_rate(clk);
 475 }
 476
 477 static int gen3_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args)
 478 {
 479         if (args->args_count != 2) {
 480                 debug("Invaild args_count: %d\n", args->args_count);
 481                 return -EINVAL;
 482         }
 483
 484         clk->id = (args->args[0] << 16) | args->args[1];
 485
 486         return 0;
 487 }
 488
 489 const struct clk_ops gen3_clk_ops = {
 490         .enable         = gen3_clk_enable,
 491         .disable        = gen3_clk_disable,
 492         .get_rate       = gen3_clk_get_rate,
 493         .set_rate       = gen3_clk_set_rate,
 494         .of_xlate       = gen3_clk_of_xlate,
 495 };
 496
 497 int gen3_clk_probe(struct udevice *dev)
 498 {
 499         struct gen3_clk_priv *priv = dev_get_priv(dev);
 500         struct cpg_mssr_info *info =
 501                 (struct cpg_mssr_info *)dev_get_driver_data(dev);
 502         fdt_addr_t rst_base;
 503         u32 cpg_mode;
 504         int ret;
 505
 506         priv->base = (struct gen3_base *)devfdt_get_addr(dev);
 507         if (!priv->base)
 508                 return -EINVAL;
 509
 510         priv->info = info;
 511         ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1, info->reset_node);
 512         if (ret < 0)
 513                 return ret;
 514
 515         rst_base = fdtdec_get_addr(gd->fdt_blob, ret, "reg");
 516         if (rst_base == FDT_ADDR_T_NONE)
 517                 return -EINVAL;
 518
 519         cpg_mode = readl(rst_base + CPG_RST_MODEMR);
 520
 521         priv->cpg_pll_config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
 522         if (!priv->cpg_pll_config->extal_div)
 523                 return -EINVAL;
 524
 525         ret = clk_get_by_name(dev, "extal", &priv->clk_extal);
 526         if (ret < 0)
 527                 return ret;
 528
 529         if (info->extalr_node) {
 530                 ret = clk_get_by_name(dev, info->extalr_node, &priv->clk_extalr);
 531                 if (ret < 0)
 532                         return ret;
 533         }
 534
 535         return 0;
 536 }
 537
 538 int gen3_clk_remove(struct udevice *dev)
 539 {
 540         struct gen3_clk_priv *priv = dev_get_priv(dev);
 541         struct cpg_mssr_info *info = priv->info;
 542         unsigned int i;
 543
 544         /* Stop TMU0 */
 545         clrbits_le32(TMU_BASE + TSTR0, TSTR0_STR0);
 546
 547         /* Stop module clock */
 548         for (i = 0; i < info->mstp_table_size; i++) {
 549                 clrsetbits_le32(priv->base + SMSTPCR(i),
 550                                 info->mstp_table[i].dis,
 551                                 info->mstp_table[i].en);
 552                 clrsetbits_le32(priv->base + RMSTPCR(i),
 553                                 info->mstp_table[i].dis, 0x0);
 554         }
 555
 556         return 0;
 557 }