drivers/clk/ingenic/cgu.c

   1 /*
   2  * Ingenic SoC CGU driver
   3  *
   4  * Copyright (c) 2013-2015 Imagination Technologies
   5  * Author: Paul Burton <paul.burton@imgtec.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/bitops.h>
  19 #include <linux/clk.h>
  20 #include <linux/clk-provider.h>
  21 #include <linux/clkdev.h>
  22 #include <linux/delay.h>
  23 #include <linux/math64.h>
  24 #include <linux/of.h>
  25 #include <linux/of_address.h>
  26 #include <linux/slab.h>
  27 #include <linux/spinlock.h>
  28 #include "cgu.h"
  29
  30 #define MHZ (1000 * 1000)
  31
  32 /**
  33  * ingenic_cgu_gate_get() - get the value of clock gate register bit
  34  * @cgu: reference to the CGU whose registers should be read
  35  * @info: info struct describing the gate bit
  36  *
  37  * Retrieves the state of the clock gate bit described by info. The
  38  * caller must hold cgu->lock.
  39  *
  40  * Return: true if the gate bit is set, else false.
  41  */
  42 static inline bool
  43 ingenic_cgu_gate_get(struct ingenic_cgu *cgu,
  44                      const struct ingenic_cgu_gate_info *info)
  45 {
  46         return readl(cgu->base + info->reg) & BIT(info->bit);
  47 }
  48
  49 /**
  50  * ingenic_cgu_gate_set() - set the value of clock gate register bit
  51  * @cgu: reference to the CGU whose registers should be modified
  52  * @info: info struct describing the gate bit
  53  * @val: non-zero to gate a clock, otherwise zero
  54  *
  55  * Sets the given gate bit in order to gate or ungate a clock.
  56  *
  57  * The caller must hold cgu->lock.
  58  */
  59 static inline void
  60 ingenic_cgu_gate_set(struct ingenic_cgu *cgu,
  61                      const struct ingenic_cgu_gate_info *info, bool val)
  62 {
  63         u32 clkgr = readl(cgu->base + info->reg);
  64
  65         if (val)
  66                 clkgr |= BIT(info->bit);
  67         else
  68                 clkgr &= ~BIT(info->bit);
  69
  70         writel(clkgr, cgu->base + info->reg);
  71 }
  72
  73 /*
  74  * PLL operations
  75  */
  76
  77 static unsigned long
  78 ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
  79 {
  80         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
  81         struct ingenic_cgu *cgu = ingenic_clk->cgu;
  82         const struct ingenic_cgu_clk_info *clk_info;
  83         const struct ingenic_cgu_pll_info *pll_info;
  84         unsigned m, n, od_enc, od;
  85         bool bypass, enable;
  86         unsigned long flags;
  87         u32 ctl;
  88
  89         clk_info = &cgu->clock_info[ingenic_clk->idx];
  90         BUG_ON(clk_info->type != CGU_CLK_PLL);
  91         pll_info = &clk_info->pll;
  92
  93         spin_lock_irqsave(&cgu->lock, flags);
  94         ctl = readl(cgu->base + pll_info->reg);
  95         spin_unlock_irqrestore(&cgu->lock, flags);
  96
  97         m = (ctl >> pll_info->m_shift) & GENMASK(pll_info->m_bits - 1, 0);
  98         m += pll_info->m_offset;
  99         n = (ctl >> pll_info->n_shift) & GENMASK(pll_info->n_bits - 1, 0);
 100         n += pll_info->n_offset;
 101         od_enc = ctl >> pll_info->od_shift;
 102         od_enc &= GENMASK(pll_info->od_bits - 1, 0);
 103         bypass = !!(ctl & BIT(pll_info->bypass_bit));
 104         enable = !!(ctl & BIT(pll_info->enable_bit));
 105
 106         if (bypass)
 107                 return parent_rate;
 108
 109         if (!enable)
 110                 return 0;
 111
 112         for (od = 0; od < pll_info->od_max; od++) {
 113                 if (pll_info->od_encoding[od] == od_enc)
 114                         break;
 115         }
 116         BUG_ON(od == pll_info->od_max);
 117         od++;
 118
 119         return div_u64((u64)parent_rate * m, n * od);
 120 }
 121
 122 static unsigned long
 123 ingenic_pll_calc(const struct ingenic_cgu_clk_info *clk_info,
 124                  unsigned long rate, unsigned long parent_rate,
 125                  unsigned *pm, unsigned *pn, unsigned *pod)
 126 {
 127         const struct ingenic_cgu_pll_info *pll_info;
 128         unsigned m, n, od;
 129
 130         pll_info = &clk_info->pll;
 131         od = 1;
 132
 133         /*
 134          * The frequency after the input divider must be between 10 and 50 MHz.
 135          * The highest divider yields the best resolution.
 136          */
 137         n = parent_rate / (10 * MHZ);
 138         n = min_t(unsigned, n, 1 << clk_info->pll.n_bits);
 139         n = max_t(unsigned, n, pll_info->n_offset);
 140
 141         m = (rate / MHZ) * od * n / (parent_rate / MHZ);
 142         m = min_t(unsigned, m, 1 << clk_info->pll.m_bits);
 143         m = max_t(unsigned, m, pll_info->m_offset);
 144
 145         if (pm)
 146                 *pm = m;
 147         if (pn)
 148                 *pn = n;
 149         if (pod)
 150                 *pod = od;
 151
 152         return div_u64((u64)parent_rate * m, n * od);
 153 }
 154
 155 static long
 156 ingenic_pll_round_rate(struct clk_hw *hw, unsigned long req_rate,
 157                        unsigned long *prate)
 158 {
 159         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 160         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 161         const struct ingenic_cgu_clk_info *clk_info;
 162
 163         clk_info = &cgu->clock_info[ingenic_clk->idx];
 164         BUG_ON(clk_info->type != CGU_CLK_PLL);
 165
 166         return ingenic_pll_calc(clk_info, req_rate, *prate, NULL, NULL, NULL);
 167 }
 168
 169 static int
 170 ingenic_pll_set_rate(struct clk_hw *hw, unsigned long req_rate,
 171                      unsigned long parent_rate)
 172 {
 173         const unsigned timeout = 100;
 174         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 175         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 176         const struct ingenic_cgu_clk_info *clk_info;
 177         const struct ingenic_cgu_pll_info *pll_info;
 178         unsigned long rate, flags;
 179         unsigned m, n, od, i;
 180         u32 ctl;
 181
 182         clk_info = &cgu->clock_info[ingenic_clk->idx];
 183         BUG_ON(clk_info->type != CGU_CLK_PLL);
 184         pll_info = &clk_info->pll;
 185
 186         rate = ingenic_pll_calc(clk_info, req_rate, parent_rate,
 187                                &m, &n, &od);
 188         if (rate != req_rate)
 189                 pr_info("ingenic-cgu: request '%s' rate %luHz, actual %luHz\n",
 190                         clk_info->name, req_rate, rate);
 191
 192         spin_lock_irqsave(&cgu->lock, flags);
 193         ctl = readl(cgu->base + pll_info->reg);
 194
 195         ctl &= ~(GENMASK(pll_info->m_bits - 1, 0) << pll_info->m_shift);
 196         ctl |= (m - pll_info->m_offset) << pll_info->m_shift;
 197
 198         ctl &= ~(GENMASK(pll_info->n_bits - 1, 0) << pll_info->n_shift);
 199         ctl |= (n - pll_info->n_offset) << pll_info->n_shift;
 200
 201         ctl &= ~(GENMASK(pll_info->od_bits - 1, 0) << pll_info->od_shift);
 202         ctl |= pll_info->od_encoding[od - 1] << pll_info->od_shift;
 203
 204         ctl &= ~BIT(pll_info->bypass_bit);
 205         ctl |= BIT(pll_info->enable_bit);
 206
 207         writel(ctl, cgu->base + pll_info->reg);
 208
 209         /* wait for the PLL to stabilise */
 210         for (i = 0; i < timeout; i++) {
 211                 ctl = readl(cgu->base + pll_info->reg);
 212                 if (ctl & BIT(pll_info->stable_bit))
 213                         break;
 214                 mdelay(1);
 215         }
 216
 217         spin_unlock_irqrestore(&cgu->lock, flags);
 218
 219         if (i == timeout)
 220                 return -EBUSY;
 221
 222         return 0;
 223 }
 224
 225 static const struct clk_ops ingenic_pll_ops = {
 226         .recalc_rate = ingenic_pll_recalc_rate,
 227         .round_rate = ingenic_pll_round_rate,
 228         .set_rate = ingenic_pll_set_rate,
 229 };
 230
 231 /*
 232  * Operations for all non-PLL clocks
 233  */
 234
 235 static u8 ingenic_clk_get_parent(struct clk_hw *hw)
 236 {
 237         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 238         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 239         const struct ingenic_cgu_clk_info *clk_info;
 240         u32 reg;
 241         u8 i, hw_idx, idx = 0;
 242
 243         clk_info = &cgu->clock_info[ingenic_clk->idx];
 244
 245         if (clk_info->type & CGU_CLK_MUX) {
 246                 reg = readl(cgu->base + clk_info->mux.reg);
 247                 hw_idx = (reg >> clk_info->mux.shift) &
 248                          GENMASK(clk_info->mux.bits - 1, 0);
 249
 250                 /*
 251                  * Convert the hardware index to the parent index by skipping
 252                  * over any -1's in the parents array.
 253                  */
 254                 for (i = 0; i < hw_idx; i++) {
 255                         if (clk_info->parents[i] != -1)
 256                                 idx++;
 257                 }
 258         }
 259
 260         return idx;
 261 }
 262
 263 static int ingenic_clk_set_parent(struct clk_hw *hw, u8 idx)
 264 {
 265         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 266         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 267         const struct ingenic_cgu_clk_info *clk_info;
 268         unsigned long flags;
 269         u8 curr_idx, hw_idx, num_poss;
 270         u32 reg, mask;
 271
 272         clk_info = &cgu->clock_info[ingenic_clk->idx];
 273
 274         if (clk_info->type & CGU_CLK_MUX) {
 275                 /*
 276                  * Convert the parent index to the hardware index by adding
 277                  * 1 for any -1 in the parents array preceding the given
 278                  * index. That is, we want the index of idx'th entry in
 279                  * clk_info->parents which does not equal -1.
 280                  */
 281                 hw_idx = curr_idx = 0;
 282                 num_poss = 1 << clk_info->mux.bits;
 283                 for (; hw_idx < num_poss; hw_idx++) {
 284                         if (clk_info->parents[hw_idx] == -1)
 285                                 continue;
 286                         if (curr_idx == idx)
 287                                 break;
 288                         curr_idx++;
 289                 }
 290
 291                 /* idx should always be a valid parent */
 292                 BUG_ON(curr_idx != idx);
 293
 294                 mask = GENMASK(clk_info->mux.bits - 1, 0);
 295                 mask <<= clk_info->mux.shift;
 296
 297                 spin_lock_irqsave(&cgu->lock, flags);
 298
 299                 /* write the register */
 300                 reg = readl(cgu->base + clk_info->mux.reg);
 301                 reg &= ~mask;
 302                 reg |= hw_idx << clk_info->mux.shift;
 303                 writel(reg, cgu->base + clk_info->mux.reg);
 304
 305                 spin_unlock_irqrestore(&cgu->lock, flags);
 306                 return 0;
 307         }
 308
 309         return idx ? -EINVAL : 0;
 310 }
 311
 312 static unsigned long
 313 ingenic_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
 314 {
 315         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 316         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 317         const struct ingenic_cgu_clk_info *clk_info;
 318         unsigned long rate = parent_rate;
 319         u32 div_reg, div;
 320
 321         clk_info = &cgu->clock_info[ingenic_clk->idx];
 322
 323         if (clk_info->type & CGU_CLK_DIV) {
 324                 div_reg = readl(cgu->base + clk_info->div.reg);
 325                 div = (div_reg >> clk_info->div.shift) &
 326                       GENMASK(clk_info->div.bits - 1, 0);
 327                 div += 1;
 328                 div *= clk_info->div.div;
 329
 330                 rate /= div;
 331         }
 332
 333         return rate;
 334 }
 335
 336 static unsigned
 337 ingenic_clk_calc_div(const struct ingenic_cgu_clk_info *clk_info,
 338                      unsigned long parent_rate, unsigned long req_rate)
 339 {
 340         unsigned div;
 341
 342         /* calculate the divide */
 343         div = DIV_ROUND_UP(parent_rate, req_rate);
 344
 345         /* and impose hardware constraints */
 346         div = min_t(unsigned, div, 1 << clk_info->div.bits);
 347         div = max_t(unsigned, div, 1);
 348
 349         /*
 350          * If the divider value itself must be divided before being written to
 351          * the divider register, we must ensure we don't have any bits set that
 352          * would be lost as a result of doing so.
 353          */
 354         div /= clk_info->div.div;
 355         div *= clk_info->div.div;
 356
 357         return div;
 358 }
 359
 360 static long
 361 ingenic_clk_round_rate(struct clk_hw *hw, unsigned long req_rate,
 362                        unsigned long *parent_rate)
 363 {
 364         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 365         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 366         const struct ingenic_cgu_clk_info *clk_info;
 367         long rate = *parent_rate;
 368
 369         clk_info = &cgu->clock_info[ingenic_clk->idx];
 370
 371         if (clk_info->type & CGU_CLK_DIV)
 372                 rate /= ingenic_clk_calc_div(clk_info, *parent_rate, req_rate);
 373         else if (clk_info->type & CGU_CLK_FIXDIV)
 374                 rate /= clk_info->fixdiv.div;
 375
 376         return rate;
 377 }
 378
 379 static int
 380 ingenic_clk_set_rate(struct clk_hw *hw, unsigned long req_rate,
 381                      unsigned long parent_rate)
 382 {
 383         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 384         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 385         const struct ingenic_cgu_clk_info *clk_info;
 386         const unsigned timeout = 100;
 387         unsigned long rate, flags;
 388         unsigned div, i;
 389         u32 reg, mask;
 390         int ret = 0;
 391
 392         clk_info = &cgu->clock_info[ingenic_clk->idx];
 393
 394         if (clk_info->type & CGU_CLK_DIV) {
 395                 div = ingenic_clk_calc_div(clk_info, parent_rate, req_rate);
 396                 rate = parent_rate / div;
 397
 398                 if (rate != req_rate)
 399                         return -EINVAL;
 400
 401                 spin_lock_irqsave(&cgu->lock, flags);
 402                 reg = readl(cgu->base + clk_info->div.reg);
 403
 404                 /* update the divide */
 405                 mask = GENMASK(clk_info->div.bits - 1, 0);
 406                 reg &= ~(mask << clk_info->div.shift);
 407                 reg |= ((div / clk_info->div.div) - 1) << clk_info->div.shift;
 408
 409                 /* clear the stop bit */
 410                 if (clk_info->div.stop_bit != -1)
 411                         reg &= ~BIT(clk_info->div.stop_bit);
 412
 413                 /* set the change enable bit */
 414                 if (clk_info->div.ce_bit != -1)
 415                         reg |= BIT(clk_info->div.ce_bit);
 416
 417                 /* update the hardware */
 418                 writel(reg, cgu->base + clk_info->div.reg);
 419
 420                 /* wait for the change to take effect */
 421                 if (clk_info->div.busy_bit != -1) {
 422                         for (i = 0; i < timeout; i++) {
 423                                 reg = readl(cgu->base + clk_info->div.reg);
 424                                 if (!(reg & BIT(clk_info->div.busy_bit)))
 425                                         break;
 426                                 mdelay(1);
 427                         }
 428                         if (i == timeout)
 429                                 ret = -EBUSY;
 430                 }
 431
 432                 spin_unlock_irqrestore(&cgu->lock, flags);
 433                 return ret;
 434         }
 435
 436         return -EINVAL;
 437 }
 438
 439 static int ingenic_clk_enable(struct clk_hw *hw)
 440 {
 441         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 442         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 443         const struct ingenic_cgu_clk_info *clk_info;
 444         unsigned long flags;
 445
 446         clk_info = &cgu->clock_info[ingenic_clk->idx];
 447
 448         if (clk_info->type & CGU_CLK_GATE) {
 449                 /* ungate the clock */
 450                 spin_lock_irqsave(&cgu->lock, flags);
 451                 ingenic_cgu_gate_set(cgu, &clk_info->gate, false);
 452                 spin_unlock_irqrestore(&cgu->lock, flags);
 453         }
 454
 455         return 0;
 456 }
 457
 458 static void ingenic_clk_disable(struct clk_hw *hw)
 459 {
 460         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 461         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 462         const struct ingenic_cgu_clk_info *clk_info;
 463         unsigned long flags;
 464
 465         clk_info = &cgu->clock_info[ingenic_clk->idx];
 466
 467         if (clk_info->type & CGU_CLK_GATE) {
 468                 /* gate the clock */
 469                 spin_lock_irqsave(&cgu->lock, flags);
 470                 ingenic_cgu_gate_set(cgu, &clk_info->gate, true);
 471                 spin_unlock_irqrestore(&cgu->lock, flags);
 472         }
 473 }
 474
 475 static int ingenic_clk_is_enabled(struct clk_hw *hw)
 476 {
 477         struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
 478         struct ingenic_cgu *cgu = ingenic_clk->cgu;
 479         const struct ingenic_cgu_clk_info *clk_info;
 480         unsigned long flags;
 481         int enabled = 1;
 482
 483         clk_info = &cgu->clock_info[ingenic_clk->idx];
 484
 485         if (clk_info->type & CGU_CLK_GATE) {
 486                 spin_lock_irqsave(&cgu->lock, flags);
 487                 enabled = !ingenic_cgu_gate_get(cgu, &clk_info->gate);
 488                 spin_unlock_irqrestore(&cgu->lock, flags);
 489         }
 490
 491         return enabled;
 492 }
 493
 494 static const struct clk_ops ingenic_clk_ops = {
 495         .get_parent = ingenic_clk_get_parent,
 496         .set_parent = ingenic_clk_set_parent,
 497
 498         .recalc_rate = ingenic_clk_recalc_rate,
 499         .round_rate = ingenic_clk_round_rate,
 500         .set_rate = ingenic_clk_set_rate,
 501
 502         .enable = ingenic_clk_enable,
 503         .disable = ingenic_clk_disable,
 504         .is_enabled = ingenic_clk_is_enabled,
 505 };
 506
 507 /*
 508  * Setup functions.
 509  */
 510
 511 static int ingenic_register_clock(struct ingenic_cgu *cgu, unsigned idx)
 512 {
 513         const struct ingenic_cgu_clk_info *clk_info = &cgu->clock_info[idx];
 514         struct clk_init_data clk_init;
 515         struct ingenic_clk *ingenic_clk = NULL;
 516         struct clk *clk, *parent;
 517         const char *parent_names[4];
 518         unsigned caps, i, num_possible;
 519         int err = -EINVAL;
 520
 521         BUILD_BUG_ON(ARRAY_SIZE(clk_info->parents) > ARRAY_SIZE(parent_names));
 522
 523         if (clk_info->type == CGU_CLK_EXT) {
 524                 clk = of_clk_get_by_name(cgu->np, clk_info->name);
 525                 if (IS_ERR(clk)) {
 526                         pr_err("%s: no external clock '%s' provided\n",
 527                                __func__, clk_info->name);
 528                         err = -ENODEV;
 529                         goto out;
 530                 }
 531                 err = clk_register_clkdev(clk, clk_info->name, NULL);
 532                 if (err) {
 533                         clk_put(clk);
 534                         goto out;
 535                 }
 536                 cgu->clocks.clks[idx] = clk;
 537                 return 0;
 538         }
 539
 540         if (!clk_info->type) {
 541                 pr_err("%s: no clock type specified for '%s'\n", __func__,
 542                        clk_info->name);
 543                 goto out;
 544         }
 545
 546         ingenic_clk = kzalloc(sizeof(*ingenic_clk), GFP_KERNEL);
 547         if (!ingenic_clk) {
 548                 err = -ENOMEM;
 549                 goto out;
 550         }
 551
 552         ingenic_clk->hw.init = &clk_init;
 553         ingenic_clk->cgu = cgu;
 554         ingenic_clk->idx = idx;
 555
 556         clk_init.name = clk_info->name;
 557         clk_init.flags = 0;
 558         clk_init.parent_names = parent_names;
 559
 560         caps = clk_info->type;
 561
 562         if (caps & (CGU_CLK_MUX | CGU_CLK_CUSTOM)) {
 563                 clk_init.num_parents = 0;
 564
 565                 if (caps & CGU_CLK_MUX)
 566                         num_possible = 1 << clk_info->mux.bits;
 567                 else
 568                         num_possible = ARRAY_SIZE(clk_info->parents);
 569
 570                 for (i = 0; i < num_possible; i++) {
 571                         if (clk_info->parents[i] == -1)
 572                                 continue;
 573
 574                         parent = cgu->clocks.clks[clk_info->parents[i]];
 575                         parent_names[clk_init.num_parents] =
 576                                 __clk_get_name(parent);
 577                         clk_init.num_parents++;
 578                 }
 579
 580                 BUG_ON(!clk_init.num_parents);
 581                 BUG_ON(clk_init.num_parents > ARRAY_SIZE(parent_names));
 582         } else {
 583                 BUG_ON(clk_info->parents[0] == -1);
 584                 clk_init.num_parents = 1;
 585                 parent = cgu->clocks.clks[clk_info->parents[0]];
 586                 parent_names[0] = __clk_get_name(parent);
 587         }
 588
 589         if (caps & CGU_CLK_CUSTOM) {
 590                 clk_init.ops = clk_info->custom.clk_ops;
 591
 592                 caps &= ~CGU_CLK_CUSTOM;
 593
 594                 if (caps) {
 595                         pr_err("%s: custom clock may not be combined with type 0x%x\n",
 596                                __func__, caps);
 597                         goto out;
 598                 }
 599         } else if (caps & CGU_CLK_PLL) {
 600                 clk_init.ops = &ingenic_pll_ops;
 601
 602                 caps &= ~CGU_CLK_PLL;
 603
 604                 if (caps) {
 605                         pr_err("%s: PLL may not be combined with type 0x%x\n",
 606                                __func__, caps);
 607                         goto out;
 608                 }
 609         } else {
 610                 clk_init.ops = &ingenic_clk_ops;
 611         }
 612
 613         /* nothing to do for gates or fixed dividers */
 614         caps &= ~(CGU_CLK_GATE | CGU_CLK_FIXDIV);
 615
 616         if (caps & CGU_CLK_MUX) {
 617                 if (!(caps & CGU_CLK_MUX_GLITCHFREE))
 618                         clk_init.flags |= CLK_SET_PARENT_GATE;
 619
 620                 caps &= ~(CGU_CLK_MUX | CGU_CLK_MUX_GLITCHFREE);
 621         }
 622
 623         if (caps & CGU_CLK_DIV) {
 624                 caps &= ~CGU_CLK_DIV;
 625         } else {
 626                 /* pass rate changes to the parent clock */
 627                 clk_init.flags |= CLK_SET_RATE_PARENT;
 628         }
 629
 630         if (caps) {
 631                 pr_err("%s: unknown clock type 0x%x\n", __func__, caps);
 632                 goto out;
 633         }
 634
 635         clk = clk_register(NULL, &ingenic_clk->hw);
 636         if (IS_ERR(clk)) {
 637                 pr_err("%s: failed to register clock '%s'\n", __func__,
 638                        clk_info->name);
 639                 err = PTR_ERR(clk);
 640                 goto out;
 641         }
 642
 643         err = clk_register_clkdev(clk, clk_info->name, NULL);
 644         if (err)
 645                 goto out;
 646
 647         cgu->clocks.clks[idx] = clk;
 648 out:
 649         if (err)
 650                 kfree(ingenic_clk);
 651         return err;
 652 }
 653
 654 struct ingenic_cgu *
 655 ingenic_cgu_new(const struct ingenic_cgu_clk_info *clock_info,
 656                 unsigned num_clocks, struct device_node *np)
 657 {
 658         struct ingenic_cgu *cgu;
 659
 660         cgu = kzalloc(sizeof(*cgu), GFP_KERNEL);
 661         if (!cgu)
 662                 goto err_out;
 663
 664         cgu->base = of_iomap(np, 0);
 665         if (!cgu->base) {
 666                 pr_err("%s: failed to map CGU registers\n", __func__);
 667                 goto err_out_free;
 668         }
 669
 670         cgu->np = np;
 671         cgu->clock_info = clock_info;
 672         cgu->clocks.clk_num = num_clocks;
 673
 674         spin_lock_init(&cgu->lock);
 675
 676         return cgu;
 677
 678 err_out_free:
 679         kfree(cgu);
 680 err_out:
 681         return NULL;
 682 }
 683
 684 int ingenic_cgu_register_clocks(struct ingenic_cgu *cgu)
 685 {
 686         unsigned i;
 687         int err;
 688
 689         cgu->clocks.clks = kcalloc(cgu->clocks.clk_num, sizeof(struct clk *),
 690                                    GFP_KERNEL);
 691         if (!cgu->clocks.clks) {
 692                 err = -ENOMEM;
 693                 goto err_out;
 694         }
 695
 696         for (i = 0; i < cgu->clocks.clk_num; i++) {
 697                 err = ingenic_register_clock(cgu, i);
 698                 if (err)
 699                         goto err_out_unregister;
 700         }
 701
 702         err = of_clk_add_provider(cgu->np, of_clk_src_onecell_get,
 703                                   &cgu->clocks);
 704         if (err)
 705                 goto err_out_unregister;
 706
 707         return 0;
 708
 709 err_out_unregister:
 710         for (i = 0; i < cgu->clocks.clk_num; i++) {
 711                 if (!cgu->clocks.clks[i])
 712                         continue;
 713                 if (cgu->clock_info[i].type & CGU_CLK_EXT)
 714                         clk_put(cgu->clocks.clks[i]);
 715                 else
 716                         clk_unregister(cgu->clocks.clks[i]);
 717         }
 718         kfree(cgu->clocks.clks);
 719 err_out:
 720         return err;
 721 }