git.oblomov.eu Git - linux-2.6/blob - arch/arm/mach-omap2/clock.c

   1 /*
   2  *  linux/arch/arm/mach-omap2/clock.c
   3  *
   4  *  Copyright (C) 2005 Texas Instruments Inc.
   5  *  Richard Woodruff <r-woodruff2@ti.com>
   6  *  Created for OMAP2.
   7  *
   8  *  Cleaned up and modified to use omap shared clock framework by
   9  *  Tony Lindgren <tony@atomide.com>
  10  *
  11  *  Based on omap1 clock.c, Copyright (C) 2004 - 2005 Nokia corporation
  12  *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/device.h>
  21 #include <linux/list.h>
  22 #include <linux/errno.h>
  23 #include <linux/delay.h>
  24 #include <linux/clk.h>
  25
  26 #include <asm/io.h>
  27
  28 #include <asm/arch/clock.h>
  29 #include <asm/arch/sram.h>
  30
  31 #include "prcm-regs.h"
  32 #include "memory.h"
  33 #include "clock.h"
  34
  35 //#define DOWN_VARIABLE_DPLL 1                  /* Experimental */
  36
  37 static struct prcm_config *curr_prcm_set;
  38 static u32 curr_perf_level = PRCM_FULL_SPEED;
  39
  40 /*-------------------------------------------------------------------------
  41  * Omap2 specific clock functions
  42  *-------------------------------------------------------------------------*/
  43
  44 /* Recalculate SYST_CLK */
  45 static void omap2_sys_clk_recalc(struct clk * clk)
  46 {
  47         u32 div = PRCM_CLKSRC_CTRL;
  48         div &= (1 << 7) | (1 << 6);     /* Test if ext clk divided by 1 or 2 */
  49         div >>= clk->rate_offset;
  50         clk->rate = (clk->parent->rate / div);
  51         propagate_rate(clk);
  52 }
  53
  54 static u32 omap2_get_dpll_rate(struct clk * tclk)
  55 {
  56         long long dpll_clk;
  57         int dpll_mult, dpll_div, amult;
  58
  59         dpll_mult = (CM_CLKSEL1_PLL >> 12) & 0x03ff;    /* 10 bits */
  60         dpll_div = (CM_CLKSEL1_PLL >> 8) & 0x0f;        /* 4 bits */
  61         dpll_clk = (long long)tclk->parent->rate * dpll_mult;
  62         do_div(dpll_clk, dpll_div + 1);
  63         amult = CM_CLKSEL2_PLL & 0x3;
  64         dpll_clk *= amult;
  65
  66         return dpll_clk;
  67 }
  68
  69 static void omap2_followparent_recalc(struct clk *clk)
  70 {
  71         followparent_recalc(clk);
  72 }
  73
  74 static void omap2_propagate_rate(struct clk * clk)
  75 {
  76         if (!(clk->flags & RATE_FIXED))
  77                 clk->rate = clk->parent->rate;
  78
  79         propagate_rate(clk);
  80 }
  81
  82 /* Enable an APLL if off */
  83 static void omap2_clk_fixed_enable(struct clk *clk)
  84 {
  85         u32 cval, i=0;
  86
  87         if (clk->enable_bit == 0xff)                    /* Parent will do it */
  88                 return;
  89
  90         cval = CM_CLKEN_PLL;
  91
  92         if ((cval & (0x3 << clk->enable_bit)) == (0x3 << clk->enable_bit))
  93                 return;
  94
  95         cval &= ~(0x3 << clk->enable_bit);
  96         cval |= (0x3 << clk->enable_bit);
  97         CM_CLKEN_PLL = cval;
  98
  99         if (clk == &apll96_ck)
 100                 cval = (1 << 8);
 101         else if (clk == &apll54_ck)
 102                 cval = (1 << 6);
 103
 104         while (!CM_IDLEST_CKGEN & cval) {               /* Wait for lock */
 105                 ++i;
 106                 udelay(1);
 107                 if (i == 100000)
 108                         break;
 109         }
 110 }
 111
 112 /* Enables clock without considering parent dependencies or use count
 113  * REVISIT: Maybe change this to use clk->enable like on omap1?
 114  */
 115 static int _omap2_clk_enable(struct clk * clk)
 116 {
 117         u32 regval32;
 118
 119         if (clk->flags & ALWAYS_ENABLED)
 120                 return 0;
 121
 122         if (unlikely(clk->enable_reg == 0)) {
 123                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 124                        clk->name);
 125                 return 0;
 126         }
 127
 128         if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
 129                 omap2_clk_fixed_enable(clk);
 130                 return 0;
 131         }
 132
 133         regval32 = __raw_readl(clk->enable_reg);
 134         regval32 |= (1 << clk->enable_bit);
 135         __raw_writel(regval32, clk->enable_reg);
 136
 137         return 0;
 138 }
 139
 140 /* Stop APLL */
 141 static void omap2_clk_fixed_disable(struct clk *clk)
 142 {
 143         u32 cval;
 144
 145         if(clk->enable_bit == 0xff)             /* let parent off do it */
 146                 return;
 147
 148         cval = CM_CLKEN_PLL;
 149         cval &= ~(0x3 << clk->enable_bit);
 150         CM_CLKEN_PLL = cval;
 151 }
 152
 153 /* Disables clock without considering parent dependencies or use count */
 154 static void _omap2_clk_disable(struct clk *clk)
 155 {
 156         u32 regval32;
 157
 158         if (clk->enable_reg == 0)
 159                 return;
 160
 161         if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
 162                 omap2_clk_fixed_disable(clk);
 163                 return;
 164         }
 165
 166         regval32 = __raw_readl(clk->enable_reg);
 167         regval32 &= ~(1 << clk->enable_bit);
 168         __raw_writel(regval32, clk->enable_reg);
 169 }
 170
 171 static int omap2_clk_enable(struct clk *clk)
 172 {
 173         int ret = 0;
 174
 175         if (clk->usecount++ == 0) {
 176                 if (likely((u32)clk->parent))
 177                         ret = omap2_clk_enable(clk->parent);
 178
 179                 if (unlikely(ret != 0)) {
 180                         clk->usecount--;
 181                         return ret;
 182                 }
 183
 184                 ret = _omap2_clk_enable(clk);
 185
 186                 if (unlikely(ret != 0) && clk->parent) {
 187                         omap2_clk_disable(clk->parent);
 188                         clk->usecount--;
 189                 }
 190         }
 191
 192         return ret;
 193 }
 194
 195 static void omap2_clk_disable(struct clk *clk)
 196 {
 197         if (clk->usecount > 0 && !(--clk->usecount)) {
 198                 _omap2_clk_disable(clk);
 199                 if (likely((u32)clk->parent))
 200                         omap2_clk_disable(clk->parent);
 201         }
 202 }
 203
 204 /*
 205  * Uses the current prcm set to tell if a rate is valid.
 206  * You can go slower, but not faster within a given rate set.
 207  */
 208 static u32 omap2_dpll_round_rate(unsigned long target_rate)
 209 {
 210         u32 high, low;
 211
 212         if ((CM_CLKSEL2_PLL & 0x3) == 1) {      /* DPLL clockout */
 213                 high = curr_prcm_set->dpll_speed * 2;
 214                 low = curr_prcm_set->dpll_speed;
 215         } else {                                /* DPLL clockout x 2 */
 216                 high = curr_prcm_set->dpll_speed;
 217                 low = curr_prcm_set->dpll_speed / 2;
 218         }
 219
 220 #ifdef DOWN_VARIABLE_DPLL
 221         if (target_rate > high)
 222                 return high;
 223         else
 224                 return target_rate;
 225 #else
 226         if (target_rate > low)
 227                 return high;
 228         else
 229                 return low;
 230 #endif
 231
 232 }
 233
 234 /*
 235  * Used for clocks that are part of CLKSEL_xyz governed clocks.
 236  * REVISIT: Maybe change to use clk->enable() functions like on omap1?
 237  */
 238 static void omap2_clksel_recalc(struct clk * clk)
 239 {
 240         u32 fixed = 0, div = 0;
 241
 242         if (clk == &dpll_ck) {
 243                 clk->rate = omap2_get_dpll_rate(clk);
 244                 fixed = 1;
 245                 div = 0;
 246         }
 247
 248         if (clk == &iva1_mpu_int_ifck) {
 249                 div = 2;
 250                 fixed = 1;
 251         }
 252
 253         if ((clk == &dss1_fck) && ((CM_CLKSEL1_CORE & (0x1f << 8)) == 0)) {
 254                 clk->rate = sys_ck.rate;
 255                 return;
 256         }
 257
 258         if (!fixed) {
 259                 div = omap2_clksel_get_divisor(clk);
 260                 if (div == 0)
 261                         return;
 262         }
 263
 264         if (div != 0) {
 265                 if (unlikely(clk->rate == clk->parent->rate / div))
 266                         return;
 267                 clk->rate = clk->parent->rate / div;
 268         }
 269
 270         if (unlikely(clk->flags & RATE_PROPAGATES))
 271                 propagate_rate(clk);
 272 }
 273
 274 /*
 275  * Finds best divider value in an array based on the source and target
 276  * rates. The divider array must be sorted with smallest divider first.
 277  */
 278 static inline u32 omap2_divider_from_table(u32 size, u32 *div_array,
 279                                            u32 src_rate, u32 tgt_rate)
 280 {
 281         int i, test_rate;
 282
 283         if (div_array == NULL)
 284                 return ~1;
 285
 286         for (i=0; i < size; i++) {
 287                 test_rate = src_rate / *div_array;
 288                 if (test_rate <= tgt_rate)
 289                         return *div_array;
 290                 ++div_array;
 291         }
 292
 293         return ~0;      /* No acceptable divider */
 294 }
 295
 296 /*
 297  * Find divisor for the given clock and target rate.
 298  *
 299  * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
 300  * they are only settable as part of virtual_prcm set.
 301  */
 302 static u32 omap2_clksel_round_rate(struct clk *tclk, u32 target_rate,
 303         u32 *new_div)
 304 {
 305         u32 gfx_div[] = {2, 3, 4};
 306         u32 sysclkout_div[] = {1, 2, 4, 8, 16};
 307         u32 dss1_div[] = {1, 2, 3, 4, 5, 6, 8, 9, 12, 16};
 308         u32 vylnq_div[] = {1, 2, 3, 4, 6, 8, 9, 12, 16, 18};
 309         u32 best_div = ~0, asize = 0;
 310         u32 *div_array = NULL;
 311
 312         switch (tclk->flags & SRC_RATE_SEL_MASK) {
 313         case CM_GFX_SEL1:
 314                 asize = 3;
 315                 div_array = gfx_div;
 316                 break;
 317         case CM_PLL_SEL1:
 318                 return omap2_dpll_round_rate(target_rate);
 319         case CM_SYSCLKOUT_SEL1:
 320                 asize = 5;
 321                 div_array = sysclkout_div;
 322                 break;
 323         case CM_CORE_SEL1:
 324                 if(tclk == &dss1_fck){
 325                         if(tclk->parent == &core_ck){
 326                                 asize = 10;
 327                                 div_array = dss1_div;
 328                         } else {
 329                                 *new_div = 0; /* fixed clk */
 330                                 return(tclk->parent->rate);
 331                         }
 332                 } else if((tclk == &vlynq_fck) && cpu_is_omap2420()){
 333                         if(tclk->parent == &core_ck){
 334                                 asize = 10;
 335                                 div_array = vylnq_div;
 336                         } else {
 337                                 *new_div = 0; /* fixed clk */
 338                                 return(tclk->parent->rate);
 339                         }
 340                 }
 341                 break;
 342         }
 343
 344         best_div = omap2_divider_from_table(asize, div_array,
 345          tclk->parent->rate, target_rate);
 346         if (best_div == ~0){
 347                 *new_div = 1;
 348                 return best_div; /* signal error */
 349         }
 350
 351         *new_div = best_div;
 352         return (tclk->parent->rate / best_div);
 353 }
 354
 355 /* Given a clock and a rate apply a clock specific rounding function */
 356 static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
 357 {
 358         u32 new_div = 0;
 359         int valid_rate;
 360
 361         if (clk->flags & RATE_FIXED)
 362                 return clk->rate;
 363
 364         if (clk->flags & RATE_CKCTL) {
 365                 valid_rate = omap2_clksel_round_rate(clk, rate, &new_div);
 366                 return valid_rate;
 367         }
 368
 369         if (clk->round_rate != 0)
 370                 return clk->round_rate(clk, rate);
 371
 372         return clk->rate;
 373 }
 374
 375 /*
 376  * Check the DLL lock state, and return tue if running in unlock mode.
 377  * This is needed to compenste for the shifted DLL value in unlock mode.
 378  */
 379 static u32 omap2_dll_force_needed(void)
 380 {
 381         u32 dll_state = SDRC_DLLA_CTRL;         /* dlla and dllb are a set */
 382
 383         if ((dll_state & (1 << 2)) == (1 << 2))
 384                 return 1;
 385         else
 386                 return 0;
 387 }
 388
 389 static u32 omap2_reprogram_sdrc(u32 level, u32 force)
 390 {
 391         u32 slow_dll_ctrl, fast_dll_ctrl, m_type;
 392         u32 prev = curr_perf_level, flags;
 393
 394         if ((curr_perf_level == level) && !force)
 395                 return prev;
 396
 397         m_type = omap2_memory_get_type();
 398         slow_dll_ctrl = omap2_memory_get_slow_dll_ctrl();
 399         fast_dll_ctrl = omap2_memory_get_fast_dll_ctrl();
 400
 401         if (level == PRCM_HALF_SPEED) {
 402                 local_irq_save(flags);
 403                 PRCM_VOLTSETUP = 0xffff;
 404                 omap2_sram_reprogram_sdrc(PRCM_HALF_SPEED,
 405                                           slow_dll_ctrl, m_type);
 406                 curr_perf_level = PRCM_HALF_SPEED;
 407                 local_irq_restore(flags);
 408         }
 409         if (level == PRCM_FULL_SPEED) {
 410                 local_irq_save(flags);
 411                 PRCM_VOLTSETUP = 0xffff;
 412                 omap2_sram_reprogram_sdrc(PRCM_FULL_SPEED,
 413                                           fast_dll_ctrl, m_type);
 414                 curr_perf_level = PRCM_FULL_SPEED;
 415                 local_irq_restore(flags);
 416         }
 417
 418         return prev;
 419 }
 420
 421 static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
 422 {
 423         u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
 424         u32 bypass = 0;
 425         struct prcm_config tmpset;
 426         int ret = -EINVAL;
 427
 428         local_irq_save(flags);
 429         cur_rate = omap2_get_dpll_rate(&dpll_ck);
 430         mult = CM_CLKSEL2_PLL & 0x3;
 431
 432         if ((rate == (cur_rate / 2)) && (mult == 2)) {
 433                 omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
 434         } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
 435                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 436         } else if (rate != cur_rate) {
 437                 valid_rate = omap2_dpll_round_rate(rate);
 438                 if (valid_rate != rate)
 439                         goto dpll_exit;
 440
 441                 if ((CM_CLKSEL2_PLL & 0x3) == 1)
 442                         low = curr_prcm_set->dpll_speed;
 443                 else
 444                         low = curr_prcm_set->dpll_speed / 2;
 445
 446                 tmpset.cm_clksel1_pll = CM_CLKSEL1_PLL;
 447                 tmpset.cm_clksel1_pll &= ~(0x3FFF << 8);
 448                 div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
 449                 tmpset.cm_clksel2_pll = CM_CLKSEL2_PLL;
 450                 tmpset.cm_clksel2_pll &= ~0x3;
 451                 if (rate > low) {
 452                         tmpset.cm_clksel2_pll |= 0x2;
 453                         mult = ((rate / 2) / 1000000);
 454                         done_rate = PRCM_FULL_SPEED;
 455                 } else {
 456                         tmpset.cm_clksel2_pll |= 0x1;
 457                         mult = (rate / 1000000);
 458                         done_rate = PRCM_HALF_SPEED;
 459                 }
 460                 tmpset.cm_clksel1_pll |= ((div << 8) | (mult << 12));
 461
 462                 /* Worst case */
 463                 tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
 464
 465                 if (rate == curr_prcm_set->xtal_speed)  /* If asking for 1-1 */
 466                         bypass = 1;
 467
 468                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1); /* For init_mem */
 469
 470                 /* Force dll lock mode */
 471                 omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
 472                                bypass);
 473
 474                 /* Errata: ret dll entry state */
 475                 omap2_init_memory_params(omap2_dll_force_needed());
 476                 omap2_reprogram_sdrc(done_rate, 0);
 477         }
 478         omap2_clksel_recalc(&dpll_ck);
 479         ret = 0;
 480
 481 dpll_exit:
 482         local_irq_restore(flags);
 483         return(ret);
 484 }
 485
 486 /* Just return the MPU speed */
 487 static void omap2_mpu_recalc(struct clk * clk)
 488 {
 489         clk->rate = curr_prcm_set->mpu_speed;
 490 }
 491
 492 /*
 493  * Look for a rate equal or less than the target rate given a configuration set.
 494  *
 495  * What's not entirely clear is "which" field represents the key field.
 496  * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
 497  * just uses the ARM rates.
 498  */
 499 static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
 500 {
 501         struct prcm_config * ptr;
 502         long highest_rate;
 503
 504         if (clk != &virt_prcm_set)
 505                 return -EINVAL;
 506
 507         highest_rate = -EINVAL;
 508
 509         for (ptr = rate_table; ptr->mpu_speed; ptr++) {
 510                 if (ptr->xtal_speed != sys_ck.rate)
 511                         continue;
 512
 513                 highest_rate = ptr->mpu_speed;
 514
 515                 /* Can check only after xtal frequency check */
 516                 if (ptr->mpu_speed <= rate)
 517                         break;
 518         }
 519         return highest_rate;
 520 }
 521
 522 /*
 523  * omap2_convert_field_to_div() - turn field value into integer divider
 524  */
 525 static u32 omap2_clksel_to_divisor(u32 div_sel, u32 field_val)
 526 {
 527         u32 i;
 528         u32 clkout_array[] = {1, 2, 4, 8, 16};
 529
 530         if ((div_sel & SRC_RATE_SEL_MASK) == CM_SYSCLKOUT_SEL1) {
 531                 for (i = 0; i < 5; i++) {
 532                         if (field_val == i)
 533                                 return clkout_array[i];
 534                 }
 535                 return ~0;
 536         } else
 537                 return field_val;
 538 }
 539
 540 /*
 541  * Returns the CLKSEL divider register value
 542  * REVISIT: This should be cleaned up to work nicely with void __iomem *
 543  */
 544 static u32 omap2_get_clksel(u32 *div_sel, u32 *field_mask,
 545                             struct clk *clk)
 546 {
 547         int ret = ~0;
 548         u32 reg_val, div_off;
 549         u32 div_addr = 0;
 550         u32 mask = ~0;
 551
 552         div_off = clk->rate_offset;
 553
 554         switch ((*div_sel & SRC_RATE_SEL_MASK)) {
 555         case CM_MPU_SEL1:
 556                 div_addr = (u32)&CM_CLKSEL_MPU;
 557                 mask = 0x1f;
 558                 break;
 559         case CM_DSP_SEL1:
 560                 div_addr = (u32)&CM_CLKSEL_DSP;
 561                 if (cpu_is_omap2420()) {
 562                         if ((div_off == 0) || (div_off == 8))
 563                                 mask = 0x1f;
 564                         else if (div_off == 5)
 565                                 mask = 0x3;
 566                 } else if (cpu_is_omap2430()) {
 567                         if (div_off == 0)
 568                                 mask = 0x1f;
 569                         else if (div_off == 5)
 570                                 mask = 0x3;
 571                 }
 572                 break;
 573         case CM_GFX_SEL1:
 574                 div_addr = (u32)&CM_CLKSEL_GFX;
 575                 if (div_off == 0)
 576                         mask = 0x7;
 577                 break;
 578         case CM_MODEM_SEL1:
 579                 div_addr = (u32)&CM_CLKSEL_MDM;
 580                 if (div_off == 0)
 581                         mask = 0xf;
 582                 break;
 583         case CM_SYSCLKOUT_SEL1:
 584                 div_addr = (u32)&PRCM_CLKOUT_CTRL;
 585                 if ((div_off == 3) || (div_off = 11))
 586                         mask= 0x3;
 587                 break;
 588         case CM_CORE_SEL1:
 589                 div_addr = (u32)&CM_CLKSEL1_CORE;
 590                 switch (div_off) {
 591                 case 0:                                 /* l3 */
 592                 case 8:                                 /* dss1 */
 593                 case 15:                                /* vylnc-2420 */
 594                 case 20:                                /* ssi */
 595                         mask = 0x1f; break;
 596                 case 5:                                 /* l4 */
 597                         mask = 0x3; break;
 598                 case 13:                                /* dss2 */
 599                         mask = 0x1; break;
 600                 case 25:                                /* usb */
 601                         mask = 0x7; break;
 602                 }
 603         }
 604
 605         *field_mask = mask;
 606
 607         if (unlikely(mask == ~0))
 608                 div_addr = 0;
 609
 610         *div_sel = div_addr;
 611
 612         if (unlikely(div_addr == 0))
 613                 return ret;
 614
 615         /* Isolate field */
 616         reg_val = __raw_readl((void __iomem *)div_addr) & (mask << div_off);
 617
 618         /* Normalize back to divider value */
 619         reg_val >>= div_off;
 620
 621         return reg_val;
 622 }
 623
 624 /*
 625  * Return divider to be applied to parent clock.
 626  * Return 0 on error.
 627  */
 628 static u32 omap2_clksel_get_divisor(struct clk *clk)
 629 {
 630         int ret = 0;
 631         u32 div, div_sel, div_off, field_mask, field_val;
 632
 633         /* isolate control register */
 634         div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 635
 636         div_off = clk->rate_offset;
 637         field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
 638         if (div_sel == 0)
 639                 return ret;
 640
 641         div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 642         div = omap2_clksel_to_divisor(div_sel, field_val);
 643
 644         return div;
 645 }
 646
 647 /* Set the clock rate for a clock source */
 648 static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
 649
 650 {
 651         int ret = -EINVAL;
 652         void __iomem * reg;
 653         u32 div_sel, div_off, field_mask, field_val, reg_val, validrate;
 654         u32 new_div = 0;
 655
 656         if (!(clk->flags & CONFIG_PARTICIPANT) && (clk->flags & RATE_CKCTL)) {
 657                 if (clk == &dpll_ck)
 658                         return omap2_reprogram_dpll(clk, rate);
 659
 660                 /* Isolate control register */
 661                 div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 662                 div_off = clk->src_offset;
 663
 664                 validrate = omap2_clksel_round_rate(clk, rate, &new_div);
 665                 if(validrate != rate)
 666                         return(ret);
 667
 668                 field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
 669                 if (div_sel == 0)
 670                         return ret;
 671
 672                 if(clk->flags & CM_SYSCLKOUT_SEL1){
 673                         switch(new_div){
 674                         case 16: field_val = 4; break;
 675                         case 8:  field_val = 3; break;
 676                         case 4:  field_val = 2; break;
 677                         case 2:  field_val = 1; break;
 678                         case 1:  field_val = 0; break;
 679                         }
 680                 }
 681                 else
 682                         field_val = new_div;
 683
 684                 reg = (void __iomem *)div_sel;
 685
 686                 reg_val = __raw_readl(reg);
 687                 reg_val &= ~(field_mask << div_off);
 688                 reg_val |= (field_val << div_off);
 689
 690                 __raw_writel(reg_val, reg);
 691                 clk->rate = clk->parent->rate / field_val;
 692
 693                 if (clk->flags & DELAYED_APP)
 694                         __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
 695                 ret = 0;
 696         } else if (clk->set_rate != 0)
 697                 ret = clk->set_rate(clk, rate);
 698
 699         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 700                 propagate_rate(clk);
 701
 702         return ret;
 703 }
 704
 705 /* Converts encoded control register address into a full address */
 706 static u32 omap2_get_src_field(u32 *type_to_addr, u32 reg_offset,
 707                                struct clk *src_clk, u32 *field_mask)
 708 {
 709         u32 val = ~0, src_reg_addr = 0, mask = 0;
 710
 711         /* Find target control register.*/
 712         switch ((*type_to_addr & SRC_RATE_SEL_MASK)) {
 713         case CM_CORE_SEL1:
 714                 src_reg_addr = (u32)&CM_CLKSEL1_CORE;
 715                 if (reg_offset == 13) {                 /* DSS2_fclk */
 716                         mask = 0x1;
 717                         if (src_clk == &sys_ck)
 718                                 val = 0;
 719                         if (src_clk == &func_48m_ck)
 720                                 val = 1;
 721                 } else if (reg_offset == 8) {           /* DSS1_fclk */
 722                         mask = 0x1f;
 723                         if (src_clk == &sys_ck)
 724                                 val = 0;
 725                         else if (src_clk == &core_ck)   /* divided clock */
 726                                 val = 0x10;             /* rate needs fixing */
 727                 } else if ((reg_offset == 15) && cpu_is_omap2420()){ /*vlnyq*/
 728                         mask = 0x1F;
 729                         if(src_clk == &func_96m_ck)
 730                                 val = 0;
 731                         else if (src_clk == &core_ck)
 732                                 val = 0x10;
 733                 }
 734                 break;
 735         case CM_CORE_SEL2:
 736                 src_reg_addr = (u32)&CM_CLKSEL2_CORE;
 737                 mask = 0x3;
 738                 if (src_clk == &func_32k_ck)
 739                         val = 0x0;
 740                 if (src_clk == &sys_ck)
 741                         val = 0x1;
 742                 if (src_clk == &alt_ck)
 743                         val = 0x2;
 744                 break;
 745         case CM_WKUP_SEL1:
 746                 src_reg_addr = (u32)&CM_CLKSEL2_CORE;
 747                 mask = 0x3;
 748                 if (src_clk == &func_32k_ck)
 749                         val = 0x0;
 750                 if (src_clk == &sys_ck)
 751                         val = 0x1;
 752                 if (src_clk == &alt_ck)
 753                         val = 0x2;
 754                 break;
 755         case CM_PLL_SEL1:
 756                 src_reg_addr = (u32)&CM_CLKSEL1_PLL;
 757                 mask = 0x1;
 758                 if (reg_offset == 0x3) {
 759                         if (src_clk == &apll96_ck)
 760                                 val = 0;
 761                         if (src_clk == &alt_ck)
 762                                 val = 1;
 763                 }
 764                 else if (reg_offset == 0x5) {
 765                         if (src_clk == &apll54_ck)
 766                                 val = 0;
 767                         if (src_clk == &alt_ck)
 768                                 val = 1;
 769                 }
 770                 break;
 771         case CM_PLL_SEL2:
 772                 src_reg_addr = (u32)&CM_CLKSEL2_PLL;
 773                 mask = 0x3;
 774                 if (src_clk == &func_32k_ck)
 775                         val = 0x0;
 776                 if (src_clk == &dpll_ck)
 777                         val = 0x2;
 778                 break;
 779         case CM_SYSCLKOUT_SEL1:
 780                 src_reg_addr = (u32)&PRCM_CLKOUT_CTRL;
 781                 mask = 0x3;
 782                 if (src_clk == &dpll_ck)
 783                         val = 0;
 784                 if (src_clk == &sys_ck)
 785                         val = 1;
 786                 if (src_clk == &func_54m_ck)
 787                         val = 2;
 788                 if (src_clk == &func_96m_ck)
 789                         val = 3;
 790                 break;
 791         }
 792
 793         if (val == ~0)                  /* Catch errors in offset */
 794                 *type_to_addr = 0;
 795         else
 796                 *type_to_addr = src_reg_addr;
 797         *field_mask = mask;
 798
 799         return val;
 800 }
 801
 802 static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
 803 {
 804         void __iomem * reg;
 805         u32 src_sel, src_off, field_val, field_mask, reg_val, rate;
 806         int ret = -EINVAL;
 807
 808         if (unlikely(clk->flags & CONFIG_PARTICIPANT))
 809                 return ret;
 810
 811         if (clk->flags & SRC_SEL_MASK) {        /* On-chip SEL collection */
 812                 src_sel = (SRC_RATE_SEL_MASK & clk->flags);
 813                 src_off = clk->src_offset;
 814
 815                 if (src_sel == 0)
 816                         goto set_parent_error;
 817
 818                 field_val = omap2_get_src_field(&src_sel, src_off, new_parent,
 819                                                 &field_mask);
 820
 821                 reg = (void __iomem *)src_sel;
 822
 823                 if (clk->usecount > 0)
 824                         _omap2_clk_disable(clk);
 825
 826                 /* Set new source value (previous dividers if any in effect) */
 827                 reg_val = __raw_readl(reg) & ~(field_mask << src_off);
 828                 reg_val |= (field_val << src_off);
 829                 __raw_writel(reg_val, reg);
 830
 831                 if (clk->flags & DELAYED_APP)
 832                         __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
 833
 834                 if (clk->usecount > 0)
 835                         _omap2_clk_enable(clk);
 836
 837                 clk->parent = new_parent;
 838
 839                 /* SRC_RATE_SEL_MASK clocks follow their parents rates.*/
 840                 if ((new_parent == &core_ck) && (clk == &dss1_fck))
 841                         clk->rate = new_parent->rate / 0x10;
 842                 else
 843                         clk->rate = new_parent->rate;
 844
 845                 if (unlikely(clk->flags & RATE_PROPAGATES))
 846                         propagate_rate(clk);
 847
 848                 return 0;
 849         } else {
 850                 clk->parent = new_parent;
 851                 rate = new_parent->rate;
 852                 omap2_clk_set_rate(clk, rate);
 853                 ret = 0;
 854         }
 855
 856  set_parent_error:
 857         return ret;
 858 }
 859
 860 /* Sets basic clocks based on the specified rate */
 861 static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
 862 {
 863         u32 flags, cur_rate, done_rate, bypass = 0;
 864         u8 cpu_mask = 0;
 865         struct prcm_config *prcm;
 866         unsigned long found_speed = 0;
 867
 868         if (clk != &virt_prcm_set)
 869                 return -EINVAL;
 870
 871         /* FIXME: Change cpu_is_omap2420() to cpu_is_omap242x() */
 872         if (cpu_is_omap2420())
 873                 cpu_mask = RATE_IN_242X;
 874         else if (cpu_is_omap2430())
 875                 cpu_mask = RATE_IN_243X;
 876
 877         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 878                 if (!(prcm->flags & cpu_mask))
 879                         continue;
 880
 881                 if (prcm->xtal_speed != sys_ck.rate)
 882                         continue;
 883
 884                 if (prcm->mpu_speed <= rate) {
 885                         found_speed = prcm->mpu_speed;
 886                         break;
 887                 }
 888         }
 889
 890         if (!found_speed) {
 891                 printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
 892          rate / 1000000);
 893                 return -EINVAL;
 894         }
 895
 896         curr_prcm_set = prcm;
 897         cur_rate = omap2_get_dpll_rate(&dpll_ck);
 898
 899         if (prcm->dpll_speed == cur_rate / 2) {
 900                 omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
 901         } else if (prcm->dpll_speed == cur_rate * 2) {
 902                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 903         } else if (prcm->dpll_speed != cur_rate) {
 904                 local_irq_save(flags);
 905
 906                 if (prcm->dpll_speed == prcm->xtal_speed)
 907                         bypass = 1;
 908
 909                 if ((prcm->cm_clksel2_pll & 0x3) == 2)
 910                         done_rate = PRCM_FULL_SPEED;
 911                 else
 912                         done_rate = PRCM_HALF_SPEED;
 913
 914                 /* MPU divider */
 915                 CM_CLKSEL_MPU = prcm->cm_clksel_mpu;
 916
 917                 /* dsp + iva1 div(2420), iva2.1(2430) */
 918                 CM_CLKSEL_DSP = prcm->cm_clksel_dsp;
 919
 920                 CM_CLKSEL_GFX = prcm->cm_clksel_gfx;
 921
 922                 /* Major subsystem dividers */
 923                 CM_CLKSEL1_CORE = prcm->cm_clksel1_core;
 924                 if (cpu_is_omap2430())
 925                         CM_CLKSEL_MDM = prcm->cm_clksel_mdm;
 926
 927                 /* x2 to enter init_mem */
 928                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 929
 930                 omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
 931                                bypass);
 932
 933                 omap2_init_memory_params(omap2_dll_force_needed());
 934                 omap2_reprogram_sdrc(done_rate, 0);
 935
 936                 local_irq_restore(flags);
 937         }
 938         omap2_clksel_recalc(&dpll_ck);
 939
 940         return 0;
 941 }
 942
 943 /*-------------------------------------------------------------------------
 944  * Omap2 clock reset and init functions
 945  *-------------------------------------------------------------------------*/
 946
 947 static struct clk_functions omap2_clk_functions = {
 948         .clk_enable             = omap2_clk_enable,
 949         .clk_disable            = omap2_clk_disable,
 950         .clk_round_rate         = omap2_clk_round_rate,
 951         .clk_set_rate           = omap2_clk_set_rate,
 952         .clk_set_parent         = omap2_clk_set_parent,
 953 };
 954
 955 static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
 956 {
 957         u32 div, aplls, sclk = 13000000;
 958
 959         aplls = CM_CLKSEL1_PLL;
 960         aplls &= ((1 << 23) | (1 << 24) | (1 << 25));
 961         aplls >>= 23;                   /* Isolate field, 0,2,3 */
 962
 963         if (aplls == 0)
 964                 sclk = 19200000;
 965         else if (aplls == 2)
 966                 sclk = 13000000;
 967         else if (aplls == 3)
 968                 sclk = 12000000;
 969
 970         div = PRCM_CLKSRC_CTRL;
 971         div &= ((1 << 7) | (1 << 6));
 972         div >>= sys->rate_offset;
 973
 974         osc->rate = sclk * div;
 975         sys->rate = sclk;
 976 }
 977
 978 #ifdef CONFIG_OMAP_RESET_CLOCKS
 979 static void __init omap2_disable_unused_clocks(void)
 980 {
 981         struct clk *ck;
 982         u32 regval32;
 983
 984         list_for_each_entry(ck, &clocks, node) {
 985                 if (ck->usecount > 0 || (ck->flags & ALWAYS_ENABLED) ||
 986                         ck->enable_reg == 0)
 987                         continue;
 988
 989                 regval32 = __raw_readl(ck->enable_reg);
 990                 if ((regval32 & (1 << ck->enable_bit)) == 0)
 991                         continue;
 992
 993                 printk(KERN_INFO "Disabling unused clock \"%s\"\n", ck->name);
 994                 _omap2_clk_disable(ck);
 995         }
 996 }
 997 late_initcall(omap2_disable_unused_clocks);
 998 #endif
 999
1000 /*
1001  * Switch the MPU rate if specified on cmdline.
1002  * We cannot do this early until cmdline is parsed.
1003  */
1004 static int __init omap2_clk_arch_init(void)
1005 {
1006         if (!mpurate)
1007                 return -EINVAL;
1008
1009         if (omap2_select_table_rate(&virt_prcm_set, mpurate))
1010                 printk(KERN_ERR "Could not find matching MPU rate\n");
1011
1012         propagate_rate(&osc_ck);                /* update main root fast */
1013         propagate_rate(&func_32k_ck);           /* update main root slow */
1014
1015         printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
1016                "%ld.%01ld/%ld/%ld MHz\n",
1017                (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1018                (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1019
1020         return 0;
1021 }
1022 arch_initcall(omap2_clk_arch_init);
1023
1024 int __init omap2_clk_init(void)
1025 {
1026         struct prcm_config *prcm;
1027         struct clk ** clkp;
1028         u32 clkrate;
1029
1030         clk_init(&omap2_clk_functions);
1031         omap2_get_crystal_rate(&osc_ck, &sys_ck);
1032
1033         for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
1034              clkp++) {
1035
1036                 if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
1037                         clk_register(*clkp);
1038                         continue;
1039                 }
1040
1041                 if ((*clkp)->flags & CLOCK_IN_OMAP243X && cpu_is_omap2430()) {
1042                         clk_register(*clkp);
1043                         continue;
1044                 }
1045         }
1046
1047         /* Check the MPU rate set by bootloader */
1048         clkrate = omap2_get_dpll_rate(&dpll_ck);
1049         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
1050                 if (prcm->xtal_speed != sys_ck.rate)
1051                         continue;
1052                 if (prcm->dpll_speed <= clkrate)
1053                          break;
1054         }
1055         curr_prcm_set = prcm;
1056
1057         propagate_rate(&osc_ck);                /* update main root fast */
1058         propagate_rate(&func_32k_ck);           /* update main root slow */
1059
1060         printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
1061                "%ld.%01ld/%ld/%ld MHz\n",
1062                (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1063                (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1064
1065         /*
1066          * Only enable those clocks we will need, let the drivers
1067          * enable other clocks as necessary
1068          */
1069         clk_enable(&sync_32k_ick);
1070         clk_enable(&omapctrl_ick);
1071         if (cpu_is_omap2430())
1072                 clk_enable(&sdrc_ick);
1073
1074         return 0;
1075 }