drivers/clk/clk-vt8500.c

   1 /*
   2  * Clock implementation for VIA/Wondermedia SoC's
   3  * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  */
  15
  16 #include <linux/io.h>
  17 #include <linux/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/slab.h>
  20 #include <linux/bitops.h>
  21 #include <linux/clkdev.h>
  22 #include <linux/clk-provider.h>
  23
  24 #define LEGACY_PMC_BASE         0xD8130000
  25
  26 /* All clocks share the same lock as none can be changed concurrently */
  27 static DEFINE_SPINLOCK(_lock);
  28
  29 struct clk_device {
  30         struct clk_hw   hw;
  31         void __iomem    *div_reg;
  32         unsigned int    div_mask;
  33         void __iomem    *en_reg;
  34         int             en_bit;
  35         spinlock_t      *lock;
  36 };
  37
  38 /*
  39  * Add new PLL_TYPE_x definitions here as required. Use the first known model
  40  * to support the new type as the name.
  41  * Add case statements to vtwm_pll_recalc_rate(), vtwm_pll_round_round() and
  42  * vtwm_pll_set_rate() to handle the new PLL_TYPE_x
  43  */
  44
  45 #define PLL_TYPE_VT8500         0
  46 #define PLL_TYPE_WM8650         1
  47 #define PLL_TYPE_WM8750         2
  48 #define PLL_TYPE_WM8850         3
  49
  50 struct clk_pll {
  51         struct clk_hw   hw;
  52         void __iomem    *reg;
  53         spinlock_t      *lock;
  54         int             type;
  55 };
  56
  57 static void __iomem *pmc_base;
  58
  59 static __init void vtwm_set_pmc_base(void)
  60 {
  61         struct device_node *np =
  62                 of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
  63
  64         if (np)
  65                 pmc_base = of_iomap(np, 0);
  66         else
  67                 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
  68         of_node_put(np);
  69
  70         if (!pmc_base)
  71                 pr_err("%s:of_iomap(pmc) failed\n", __func__);
  72 }
  73
  74 #define to_clk_device(_hw) container_of(_hw, struct clk_device, hw)
  75
  76 #define VT8500_PMC_BUSY_MASK            0x18
  77
  78 static void vt8500_pmc_wait_busy(void)
  79 {
  80         while (readl(pmc_base) & VT8500_PMC_BUSY_MASK)
  81                 cpu_relax();
  82 }
  83
  84 static int vt8500_dclk_enable(struct clk_hw *hw)
  85 {
  86         struct clk_device *cdev = to_clk_device(hw);
  87         u32 en_val;
  88         unsigned long flags = 0;
  89
  90         spin_lock_irqsave(cdev->lock, flags);
  91
  92         en_val = readl(cdev->en_reg);
  93         en_val |= BIT(cdev->en_bit);
  94         writel(en_val, cdev->en_reg);
  95
  96         spin_unlock_irqrestore(cdev->lock, flags);
  97         return 0;
  98 }
  99
 100 static void vt8500_dclk_disable(struct clk_hw *hw)
 101 {
 102         struct clk_device *cdev = to_clk_device(hw);
 103         u32 en_val;
 104         unsigned long flags = 0;
 105
 106         spin_lock_irqsave(cdev->lock, flags);
 107
 108         en_val = readl(cdev->en_reg);
 109         en_val &= ~BIT(cdev->en_bit);
 110         writel(en_val, cdev->en_reg);
 111
 112         spin_unlock_irqrestore(cdev->lock, flags);
 113 }
 114
 115 static int vt8500_dclk_is_enabled(struct clk_hw *hw)
 116 {
 117         struct clk_device *cdev = to_clk_device(hw);
 118         u32 en_val = (readl(cdev->en_reg) & BIT(cdev->en_bit));
 119
 120         return en_val ? 1 : 0;
 121 }
 122
 123 static unsigned long vt8500_dclk_recalc_rate(struct clk_hw *hw,
 124                                 unsigned long parent_rate)
 125 {
 126         struct clk_device *cdev = to_clk_device(hw);
 127         u32 div = readl(cdev->div_reg) & cdev->div_mask;
 128
 129         /* Special case for SDMMC devices */
 130         if ((cdev->div_mask == 0x3F) && (div & BIT(5)))
 131                 div = 64 * (div & 0x1f);
 132
 133         /* div == 0 is actually the highest divisor */
 134         if (div == 0)
 135                 div = (cdev->div_mask + 1);
 136
 137         return parent_rate / div;
 138 }
 139
 140 static long vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
 141                                 unsigned long *prate)
 142 {
 143         struct clk_device *cdev = to_clk_device(hw);
 144         u32 divisor;
 145
 146         if (rate == 0)
 147                 return 0;
 148
 149         divisor = *prate / rate;
 150
 151         /* If prate / rate would be decimal, incr the divisor */
 152         if (rate * divisor < *prate)
 153                 divisor++;
 154
 155         /*
 156          * If this is a request for SDMMC we have to adjust the divisor
 157          * when >31 to use the fixed predivisor
 158          */
 159         if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
 160                 divisor = 64 * ((divisor / 64) + 1);
 161         }
 162
 163         return *prate / divisor;
 164 }
 165
 166 static int vt8500_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
 167                                 unsigned long parent_rate)
 168 {
 169         struct clk_device *cdev = to_clk_device(hw);
 170         u32 divisor;
 171         unsigned long flags = 0;
 172
 173         if (rate == 0)
 174                 return 0;
 175
 176         divisor =  parent_rate / rate;
 177
 178         if (divisor == cdev->div_mask + 1)
 179                 divisor = 0;
 180
 181         /* SDMMC mask may need to be corrected before testing if its valid */
 182         if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
 183                 /*
 184                  * Bit 5 is a fixed /64 predivisor. If the requested divisor
 185                  * is >31 then correct for the fixed divisor being required.
 186                  */
 187                 divisor = 0x20 + (divisor / 64);
 188         }
 189
 190         if (divisor > cdev->div_mask) {
 191                 pr_err("%s: invalid divisor for clock\n", __func__);
 192                 return -EINVAL;
 193         }
 194
 195         spin_lock_irqsave(cdev->lock, flags);
 196
 197         vt8500_pmc_wait_busy();
 198         writel(divisor, cdev->div_reg);
 199         vt8500_pmc_wait_busy();
 200
 201         spin_unlock_irqrestore(cdev->lock, flags);
 202
 203         return 0;
 204 }
 205
 206
 207 static const struct clk_ops vt8500_gated_clk_ops = {
 208         .enable = vt8500_dclk_enable,
 209         .disable = vt8500_dclk_disable,
 210         .is_enabled = vt8500_dclk_is_enabled,
 211 };
 212
 213 static const struct clk_ops vt8500_divisor_clk_ops = {
 214         .round_rate = vt8500_dclk_round_rate,
 215         .set_rate = vt8500_dclk_set_rate,
 216         .recalc_rate = vt8500_dclk_recalc_rate,
 217 };
 218
 219 static const struct clk_ops vt8500_gated_divisor_clk_ops = {
 220         .enable = vt8500_dclk_enable,
 221         .disable = vt8500_dclk_disable,
 222         .is_enabled = vt8500_dclk_is_enabled,
 223         .round_rate = vt8500_dclk_round_rate,
 224         .set_rate = vt8500_dclk_set_rate,
 225         .recalc_rate = vt8500_dclk_recalc_rate,
 226 };
 227
 228 #define CLK_INIT_GATED                  BIT(0)
 229 #define CLK_INIT_DIVISOR                BIT(1)
 230 #define CLK_INIT_GATED_DIVISOR          (CLK_INIT_DIVISOR | CLK_INIT_GATED)
 231
 232 static __init void vtwm_device_clk_init(struct device_node *node)
 233 {
 234         u32 en_reg, div_reg;
 235         struct clk *clk;
 236         struct clk_device *dev_clk;
 237         const char *clk_name = node->name;
 238         const char *parent_name;
 239         struct clk_init_data init;
 240         int rc;
 241         int clk_init_flags = 0;
 242
 243         if (!pmc_base)
 244                 vtwm_set_pmc_base();
 245
 246         dev_clk = kzalloc(sizeof(*dev_clk), GFP_KERNEL);
 247         if (WARN_ON(!dev_clk))
 248                 return;
 249
 250         dev_clk->lock = &_lock;
 251
 252         rc = of_property_read_u32(node, "enable-reg", &en_reg);
 253         if (!rc) {
 254                 dev_clk->en_reg = pmc_base + en_reg;
 255                 rc = of_property_read_u32(node, "enable-bit", &dev_clk->en_bit);
 256                 if (rc) {
 257                         pr_err("%s: enable-bit property required for gated clock\n",
 258                                                                 __func__);
 259                         return;
 260                 }
 261                 clk_init_flags |= CLK_INIT_GATED;
 262         }
 263
 264         rc = of_property_read_u32(node, "divisor-reg", &div_reg);
 265         if (!rc) {
 266                 dev_clk->div_reg = pmc_base + div_reg;
 267                 /*
 268                  * use 0x1f as the default mask since it covers
 269                  * almost all the clocks and reduces dts properties
 270                  */
 271                 dev_clk->div_mask = 0x1f;
 272
 273                 of_property_read_u32(node, "divisor-mask", &dev_clk->div_mask);
 274                 clk_init_flags |= CLK_INIT_DIVISOR;
 275         }
 276
 277         of_property_read_string(node, "clock-output-names", &clk_name);
 278
 279         switch (clk_init_flags) {
 280         case CLK_INIT_GATED:
 281                 init.ops = &vt8500_gated_clk_ops;
 282                 break;
 283         case CLK_INIT_DIVISOR:
 284                 init.ops = &vt8500_divisor_clk_ops;
 285                 break;
 286         case CLK_INIT_GATED_DIVISOR:
 287                 init.ops = &vt8500_gated_divisor_clk_ops;
 288                 break;
 289         default:
 290                 pr_err("%s: Invalid clock description in device tree\n",
 291                                                                 __func__);
 292                 kfree(dev_clk);
 293                 return;
 294         }
 295
 296         init.name = clk_name;
 297         init.flags = 0;
 298         parent_name = of_clk_get_parent_name(node, 0);
 299         init.parent_names = &parent_name;
 300         init.num_parents = 1;
 301
 302         dev_clk->hw.init = &init;
 303
 304         clk = clk_register(NULL, &dev_clk->hw);
 305         if (WARN_ON(IS_ERR(clk))) {
 306                 kfree(dev_clk);
 307                 return;
 308         }
 309         rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
 310         clk_register_clkdev(clk, clk_name, NULL);
 311 }
 312 CLK_OF_DECLARE(vt8500_device, "via,vt8500-device-clock", vtwm_device_clk_init);
 313
 314 /* PLL clock related functions */
 315
 316 #define to_clk_pll(_hw) container_of(_hw, struct clk_pll, hw)
 317
 318 /* Helper macros for PLL_VT8500 */
 319 #define VT8500_PLL_MUL(x)       ((x & 0x1F) << 1)
 320 #define VT8500_PLL_DIV(x)       ((x & 0x100) ? 1 : 2)
 321
 322 #define VT8500_BITS_TO_FREQ(r, m, d)                                    \
 323                                 ((r / d) * m)
 324
 325 #define VT8500_BITS_TO_VAL(m, d)                                        \
 326                                 ((d == 2 ? 0 : 0x100) | ((m >> 1) & 0x1F))
 327
 328 /* Helper macros for PLL_WM8650 */
 329 #define WM8650_PLL_MUL(x)       (x & 0x3FF)
 330 #define WM8650_PLL_DIV(x)       (((x >> 10) & 7) * (1 << ((x >> 13) & 3)))
 331
 332 #define WM8650_BITS_TO_FREQ(r, m, d1, d2)                               \
 333                                 (r * m / (d1 * (1 << d2)))
 334
 335 #define WM8650_BITS_TO_VAL(m, d1, d2)                                   \
 336                                 ((d2 << 13) | (d1 << 10) | (m & 0x3FF))
 337
 338 /* Helper macros for PLL_WM8750 */
 339 #define WM8750_PLL_MUL(x)       (((x >> 16) & 0xFF) + 1)
 340 #define WM8750_PLL_DIV(x)       ((((x >> 8) & 1) + 1) * (1 << (x & 7)))
 341
 342 #define WM8750_BITS_TO_FREQ(r, m, d1, d2)                               \
 343                                 (r * (m+1) / ((d1+1) * (1 << d2)))
 344
 345 #define WM8750_BITS_TO_VAL(f, m, d1, d2)                                \
 346                 ((f << 24) | ((m - 1) << 16) | ((d1 - 1) << 8) | d2)
 347
 348 /* Helper macros for PLL_WM8850 */
 349 #define WM8850_PLL_MUL(x)       ((((x >> 16) & 0x7F) + 1) * 2)
 350 #define WM8850_PLL_DIV(x)       ((((x >> 8) & 1) + 1) * (1 << (x & 3)))
 351
 352 #define WM8850_BITS_TO_FREQ(r, m, d1, d2)                               \
 353                                 (r * ((m + 1) * 2) / ((d1+1) * (1 << d2)))
 354
 355 #define WM8850_BITS_TO_VAL(m, d1, d2)                                   \
 356                 ((((m / 2) - 1) << 16) | ((d1 - 1) << 8) | d2)
 357
 358 static int vt8500_find_pll_bits(unsigned long rate, unsigned long parent_rate,
 359                                 u32 *multiplier, u32 *prediv)
 360 {
 361         unsigned long tclk;
 362
 363         /* sanity check */
 364         if ((rate < parent_rate * 4) || (rate > parent_rate * 62)) {
 365                 pr_err("%s: requested rate out of range\n", __func__);
 366                 *multiplier = 0;
 367                 *prediv = 1;
 368                 return -EINVAL;
 369         }
 370         if (rate <= parent_rate * 31)
 371                 /* use the prediv to double the resolution */
 372                 *prediv = 2;
 373         else
 374                 *prediv = 1;
 375
 376         *multiplier = rate / (parent_rate / *prediv);
 377         tclk = (parent_rate / *prediv) * *multiplier;
 378
 379         if (tclk != rate)
 380                 pr_warn("%s: requested rate %lu, found rate %lu\n", __func__,
 381                                                                 rate, tclk);
 382
 383         return 0;
 384 }
 385
 386 static int wm8650_find_pll_bits(unsigned long rate, unsigned long parent_rate,
 387                                 u32 *multiplier, u32 *divisor1, u32 *divisor2)
 388 {
 389         u32 mul, div1;
 390         int div2;
 391         unsigned long tclk, rate_err, best_err;
 392
 393         best_err = (unsigned long)-1;
 394
 395         /* Find the closest match (lower or equal to requested) */
 396         for (div1 = 5; div1 >= 3; div1--)
 397                 for (div2 = 3; div2 >= 0; div2--)
 398                         for (mul = 3; mul <= 1023; mul++) {
 399                                 tclk = parent_rate * mul / (div1 * (1 << div2));
 400                                 if (tclk > rate)
 401                                         continue;
 402                                 /* error will always be +ve */
 403                                 rate_err = rate - tclk;
 404                                 if (rate_err == 0) {
 405                                         *multiplier = mul;
 406                                         *divisor1 = div1;
 407                                         *divisor2 = div2;
 408                                         return 0;
 409                                 }
 410
 411                                 if (rate_err < best_err) {
 412                                         best_err = rate_err;
 413                                         *multiplier = mul;
 414                                         *divisor1 = div1;
 415                                         *divisor2 = div2;
 416                                 }
 417                         }
 418
 419         if (best_err == (unsigned long)-1) {
 420                 pr_warn("%s: impossible rate %lu\n", __func__, rate);
 421                 return -EINVAL;
 422         }
 423
 424         /* if we got here, it wasn't an exact match */
 425         pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
 426                                                         rate - best_err);
 427         return 0;
 428 }
 429
 430 static u32 wm8750_get_filter(u32 parent_rate, u32 divisor1)
 431 {
 432         /* calculate frequency (MHz) after pre-divisor */
 433         u32 freq = (parent_rate / 1000000) / (divisor1 + 1);
 434
 435         if ((freq < 10) || (freq > 200))
 436                 pr_warn("%s: PLL recommended input frequency 10..200Mhz (requested %d Mhz)\n",
 437                                 __func__, freq);
 438
 439         if (freq >= 166)
 440                 return 7;
 441         else if (freq >= 104)
 442                 return 6;
 443         else if (freq >= 65)
 444                 return 5;
 445         else if (freq >= 42)
 446                 return 4;
 447         else if (freq >= 26)
 448                 return 3;
 449         else if (freq >= 16)
 450                 return 2;
 451         else if (freq >= 10)
 452                 return 1;
 453
 454         return 0;
 455 }
 456
 457 static int wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
 458                                 u32 *filter, u32 *multiplier, u32 *divisor1, u32 *divisor2)
 459 {
 460         u32 mul;
 461         int div1, div2;
 462         unsigned long tclk, rate_err, best_err;
 463
 464         best_err = (unsigned long)-1;
 465
 466         /* Find the closest match (lower or equal to requested) */
 467         for (div1 = 1; div1 >= 0; div1--)
 468                 for (div2 = 7; div2 >= 0; div2--)
 469                         for (mul = 0; mul <= 255; mul++) {
 470                                 tclk = parent_rate * (mul + 1) / ((div1 + 1) * (1 << div2));
 471                                 if (tclk > rate)
 472                                         continue;
 473                                 /* error will always be +ve */
 474                                 rate_err = rate - tclk;
 475                                 if (rate_err == 0) {
 476                                         *filter = wm8750_get_filter(parent_rate, div1);
 477                                         *multiplier = mul;
 478                                         *divisor1 = div1;
 479                                         *divisor2 = div2;
 480                                         return 0;
 481                                 }
 482
 483                                 if (rate_err < best_err) {
 484                                         best_err = rate_err;
 485                                         *multiplier = mul;
 486                                         *divisor1 = div1;
 487                                         *divisor2 = div2;
 488                                 }
 489                         }
 490
 491         if (best_err == (unsigned long)-1) {
 492                 pr_warn("%s: impossible rate %lu\n", __func__, rate);
 493                 return -EINVAL;
 494         }
 495
 496         /* if we got here, it wasn't an exact match */
 497         pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
 498                                                         rate - best_err);
 499
 500         *filter = wm8750_get_filter(parent_rate, *divisor1);
 501
 502         return 0;
 503 }
 504
 505 static int wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
 506                                 u32 *multiplier, u32 *divisor1, u32 *divisor2)
 507 {
 508         u32 mul;
 509         int div1, div2;
 510         unsigned long tclk, rate_err, best_err;
 511
 512         best_err = (unsigned long)-1;
 513
 514         /* Find the closest match (lower or equal to requested) */
 515         for (div1 = 1; div1 >= 0; div1--)
 516                 for (div2 = 3; div2 >= 0; div2--)
 517                         for (mul = 0; mul <= 127; mul++) {
 518                                 tclk = parent_rate * ((mul + 1) * 2) /
 519                                                 ((div1 + 1) * (1 << div2));
 520                                 if (tclk > rate)
 521                                         continue;
 522                                 /* error will always be +ve */
 523                                 rate_err = rate - tclk;
 524                                 if (rate_err == 0) {
 525                                         *multiplier = mul;
 526                                         *divisor1 = div1;
 527                                         *divisor2 = div2;
 528                                         return 0;
 529                                 }
 530
 531                                 if (rate_err < best_err) {
 532                                         best_err = rate_err;
 533                                         *multiplier = mul;
 534                                         *divisor1 = div1;
 535                                         *divisor2 = div2;
 536                                 }
 537                         }
 538
 539         if (best_err == (unsigned long)-1) {
 540                 pr_warn("%s: impossible rate %lu\n", __func__, rate);
 541                 return -EINVAL;
 542         }
 543
 544         /* if we got here, it wasn't an exact match */
 545         pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
 546                                                         rate - best_err);
 547
 548         return 0;
 549 }
 550
 551 static int vtwm_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 552                                 unsigned long parent_rate)
 553 {
 554         struct clk_pll *pll = to_clk_pll(hw);
 555         u32 filter, mul, div1, div2;
 556         u32 pll_val;
 557         unsigned long flags = 0;
 558         int ret;
 559
 560         /* sanity check */
 561
 562         switch (pll->type) {
 563         case PLL_TYPE_VT8500:
 564                 ret = vt8500_find_pll_bits(rate, parent_rate, &mul, &div1);
 565                 if (!ret)
 566                         pll_val = VT8500_BITS_TO_VAL(mul, div1);
 567                 break;
 568         case PLL_TYPE_WM8650:
 569                 ret = wm8650_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
 570                 if (!ret)
 571                         pll_val = WM8650_BITS_TO_VAL(mul, div1, div2);
 572                 break;
 573         case PLL_TYPE_WM8750:
 574                 ret = wm8750_find_pll_bits(rate, parent_rate, &filter, &mul, &div1, &div2);
 575                 if (!ret)
 576                         pll_val = WM8750_BITS_TO_VAL(filter, mul, div1, div2);
 577                 break;
 578         case PLL_TYPE_WM8850:
 579                 ret = wm8850_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
 580                 if (!ret)
 581                         pll_val = WM8850_BITS_TO_VAL(mul, div1, div2);
 582                 break;
 583         default:
 584                 pr_err("%s: invalid pll type\n", __func__);
 585                 ret = -EINVAL;
 586         }
 587
 588         if (ret)
 589                 return ret;
 590
 591         spin_lock_irqsave(pll->lock, flags);
 592
 593         vt8500_pmc_wait_busy();
 594         writel(pll_val, pll->reg);
 595         vt8500_pmc_wait_busy();
 596
 597         spin_unlock_irqrestore(pll->lock, flags);
 598
 599         return 0;
 600 }
 601
 602 static long vtwm_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 603                                 unsigned long *prate)
 604 {
 605         struct clk_pll *pll = to_clk_pll(hw);
 606         u32 filter, mul, div1, div2;
 607         long round_rate;
 608         int ret;
 609
 610         switch (pll->type) {
 611         case PLL_TYPE_VT8500:
 612                 ret = vt8500_find_pll_bits(rate, *prate, &mul, &div1);
 613                 if (!ret)
 614                         round_rate = VT8500_BITS_TO_FREQ(*prate, mul, div1);
 615                 break;
 616         case PLL_TYPE_WM8650:
 617                 ret = wm8650_find_pll_bits(rate, *prate, &mul, &div1, &div2);
 618                 if (!ret)
 619                         round_rate = WM8650_BITS_TO_FREQ(*prate, mul, div1, div2);
 620                 break;
 621         case PLL_TYPE_WM8750:
 622                 ret = wm8750_find_pll_bits(rate, *prate, &filter, &mul, &div1, &div2);
 623                 if (!ret)
 624                         round_rate = WM8750_BITS_TO_FREQ(*prate, mul, div1, div2);
 625                 break;
 626         case PLL_TYPE_WM8850:
 627                 ret = wm8850_find_pll_bits(rate, *prate, &mul, &div1, &div2);
 628                 if (!ret)
 629                         round_rate = WM8850_BITS_TO_FREQ(*prate, mul, div1, div2);
 630                 break;
 631         default:
 632                 ret = -EINVAL;
 633         }
 634
 635         if (ret)
 636                 return ret;
 637
 638         return round_rate;
 639 }
 640
 641 static unsigned long vtwm_pll_recalc_rate(struct clk_hw *hw,
 642                                 unsigned long parent_rate)
 643 {
 644         struct clk_pll *pll = to_clk_pll(hw);
 645         u32 pll_val = readl(pll->reg);
 646         unsigned long pll_freq;
 647
 648         switch (pll->type) {
 649         case PLL_TYPE_VT8500:
 650                 pll_freq = parent_rate * VT8500_PLL_MUL(pll_val);
 651                 pll_freq /= VT8500_PLL_DIV(pll_val);
 652                 break;
 653         case PLL_TYPE_WM8650:
 654                 pll_freq = parent_rate * WM8650_PLL_MUL(pll_val);
 655                 pll_freq /= WM8650_PLL_DIV(pll_val);
 656                 break;
 657         case PLL_TYPE_WM8750:
 658                 pll_freq = parent_rate * WM8750_PLL_MUL(pll_val);
 659                 pll_freq /= WM8750_PLL_DIV(pll_val);
 660                 break;
 661         case PLL_TYPE_WM8850:
 662                 pll_freq = parent_rate * WM8850_PLL_MUL(pll_val);
 663                 pll_freq /= WM8850_PLL_DIV(pll_val);
 664                 break;
 665         default:
 666                 pll_freq = 0;
 667         }
 668
 669         return pll_freq;
 670 }
 671
 672 static const struct clk_ops vtwm_pll_ops = {
 673         .round_rate = vtwm_pll_round_rate,
 674         .set_rate = vtwm_pll_set_rate,
 675         .recalc_rate = vtwm_pll_recalc_rate,
 676 };
 677
 678 static __init void vtwm_pll_clk_init(struct device_node *node, int pll_type)
 679 {
 680         u32 reg;
 681         struct clk *clk;
 682         struct clk_pll *pll_clk;
 683         const char *clk_name = node->name;
 684         const char *parent_name;
 685         struct clk_init_data init;
 686         int rc;
 687
 688         if (!pmc_base)
 689                 vtwm_set_pmc_base();
 690
 691         rc = of_property_read_u32(node, "reg", &reg);
 692         if (WARN_ON(rc))
 693                 return;
 694
 695         pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
 696         if (WARN_ON(!pll_clk))
 697                 return;
 698
 699         pll_clk->reg = pmc_base + reg;
 700         pll_clk->lock = &_lock;
 701         pll_clk->type = pll_type;
 702
 703         of_property_read_string(node, "clock-output-names", &clk_name);
 704
 705         init.name = clk_name;
 706         init.ops = &vtwm_pll_ops;
 707         init.flags = 0;
 708         parent_name = of_clk_get_parent_name(node, 0);
 709         init.parent_names = &parent_name;
 710         init.num_parents = 1;
 711
 712         pll_clk->hw.init = &init;
 713
 714         clk = clk_register(NULL, &pll_clk->hw);
 715         if (WARN_ON(IS_ERR(clk))) {
 716                 kfree(pll_clk);
 717                 return;
 718         }
 719         rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
 720         clk_register_clkdev(clk, clk_name, NULL);
 721 }
 722
 723
 724 /* Wrappers for initialization functions */
 725
 726 static void __init vt8500_pll_init(struct device_node *node)
 727 {
 728         vtwm_pll_clk_init(node, PLL_TYPE_VT8500);
 729 }
 730 CLK_OF_DECLARE(vt8500_pll, "via,vt8500-pll-clock", vt8500_pll_init);
 731
 732 static void __init wm8650_pll_init(struct device_node *node)
 733 {
 734         vtwm_pll_clk_init(node, PLL_TYPE_WM8650);
 735 }
 736 CLK_OF_DECLARE(wm8650_pll, "wm,wm8650-pll-clock", wm8650_pll_init);
 737
 738 static void __init wm8750_pll_init(struct device_node *node)
 739 {
 740         vtwm_pll_clk_init(node, PLL_TYPE_WM8750);
 741 }
 742 CLK_OF_DECLARE(wm8750_pll, "wm,wm8750-pll-clock", wm8750_pll_init);
 743
 744 static void __init wm8850_pll_init(struct device_node *node)
 745 {
 746         vtwm_pll_clk_init(node, PLL_TYPE_WM8850);
 747 }
 748 CLK_OF_DECLARE(wm8850_pll, "wm,wm8850-pll-clock", wm8850_pll_init);