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/config.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/device.h>
  22 #include <linux/list.h>
  23 #include <linux/errno.h>
  24 #include <linux/delay.h>
  25 #include <linux/clk.h>
  26
  27 #include <asm/io.h>
  28
  29 #include <asm/arch/clock.h>
  30 #include <asm/arch/sram.h>
  31
  32 #include "prcm-regs.h"
  33 #include "memory.h"
  34 #include "clock.h"
  35
  36 //#define DOWN_VARIABLE_DPLL 1                  /* Experimental */
  37
  38 static struct prcm_config *curr_prcm_set;
  39 static u32 curr_perf_level = PRCM_FULL_SPEED;
  40
  41 /*-------------------------------------------------------------------------
  42  * Omap2 specific clock functions
  43  *-------------------------------------------------------------------------*/
  44
  45 /* Recalculate SYST_CLK */
  46 static void omap2_sys_clk_recalc(struct clk * clk)
  47 {
  48         u32 div = PRCM_CLKSRC_CTRL;
  49         div &= (1 << 7) | (1 << 6);     /* Test if ext clk divided by 1 or 2 */
  50         div >>= clk->rate_offset;
  51         clk->rate = (clk->parent->rate / div);
  52         propagate_rate(clk);
  53 }
  54
  55 static u32 omap2_get_dpll_rate(struct clk * tclk)
  56 {
  57         long long dpll_clk;
  58         int dpll_mult, dpll_div, amult;
  59
  60         dpll_mult = (CM_CLKSEL1_PLL >> 12) & 0x03ff;    /* 10 bits */
  61         dpll_div = (CM_CLKSEL1_PLL >> 8) & 0x0f;        /* 4 bits */
  62         dpll_clk = (long long)tclk->parent->rate * dpll_mult;
  63         do_div(dpll_clk, dpll_div + 1);
  64         amult = CM_CLKSEL2_PLL & 0x3;
  65         dpll_clk *= amult;
  66
  67         return dpll_clk;
  68 }
  69
  70 static void omap2_followparent_recalc(struct clk *clk)
  71 {
  72         followparent_recalc(clk);
  73 }
  74
  75 static void omap2_propagate_rate(struct clk * clk)
  76 {
  77         if (!(clk->flags & RATE_FIXED))
  78                 clk->rate = clk->parent->rate;
  79
  80         propagate_rate(clk);
  81 }
  82
  83 /* Enable an APLL if off */
  84 static void omap2_clk_fixed_enable(struct clk *clk)
  85 {
  86         u32 cval, i=0;
  87
  88         if (clk->enable_bit == 0xff)                    /* Parent will do it */
  89                 return;
  90
  91         cval = CM_CLKEN_PLL;
  92
  93         if ((cval & (0x3 << clk->enable_bit)) == (0x3 << clk->enable_bit))
  94                 return;
  95
  96         cval &= ~(0x3 << clk->enable_bit);
  97         cval |= (0x3 << clk->enable_bit);
  98         CM_CLKEN_PLL = cval;
  99
 100         if (clk == &apll96_ck)
 101                 cval = (1 << 8);
 102         else if (clk == &apll54_ck)
 103                 cval = (1 << 6);
 104
 105         while (!CM_IDLEST_CKGEN & cval) {               /* Wait for lock */
 106                 ++i;
 107                 udelay(1);
 108                 if (i == 100000)
 109                         break;
 110         }
 111 }
 112
 113 /* Enables clock without considering parent dependencies or use count
 114  * REVISIT: Maybe change this to use clk->enable like on omap1?
 115  */
 116 static int _omap2_clk_enable(struct clk * clk)
 117 {
 118         u32 regval32;
 119
 120         if (clk->flags & ALWAYS_ENABLED)
 121                 return 0;
 122
 123         if (unlikely(clk->enable_reg == 0)) {
 124                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 125                        clk->name);
 126                 return 0;
 127         }
 128
 129         if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
 130                 omap2_clk_fixed_enable(clk);
 131                 return 0;
 132         }
 133
 134         regval32 = __raw_readl(clk->enable_reg);
 135         regval32 |= (1 << clk->enable_bit);
 136         __raw_writel(regval32, clk->enable_reg);
 137
 138         return 0;
 139 }
 140
 141 /* Stop APLL */
 142 static void omap2_clk_fixed_disable(struct clk *clk)
 143 {
 144         u32 cval;
 145
 146         if(clk->enable_bit == 0xff)             /* let parent off do it */
 147                 return;
 148
 149         cval = CM_CLKEN_PLL;
 150         cval &= ~(0x3 << clk->enable_bit);
 151         CM_CLKEN_PLL = cval;
 152 }
 153
 154 /* Disables clock without considering parent dependencies or use count */
 155 static void _omap2_clk_disable(struct clk *clk)
 156 {
 157         u32 regval32;
 158
 159         if (clk->enable_reg == 0)
 160                 return;
 161
 162         if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
 163                 omap2_clk_fixed_disable(clk);
 164                 return;
 165         }
 166
 167         regval32 = __raw_readl(clk->enable_reg);
 168         regval32 &= ~(1 << clk->enable_bit);
 169         __raw_writel(regval32, clk->enable_reg);
 170 }
 171
 172 static int omap2_clk_enable(struct clk *clk)
 173 {
 174         int ret = 0;
 175
 176         if (clk->usecount++ == 0) {
 177                 if (likely((u32)clk->parent))
 178                         ret = omap2_clk_enable(clk->parent);
 179
 180                 if (unlikely(ret != 0)) {
 181                         clk->usecount--;
 182                         return ret;
 183                 }
 184
 185                 ret = _omap2_clk_enable(clk);
 186
 187                 if (unlikely(ret != 0) && clk->parent) {
 188                         omap2_clk_disable(clk->parent);
 189                         clk->usecount--;
 190                 }
 191         }
 192
 193         return ret;
 194 }
 195
 196 static void omap2_clk_disable(struct clk *clk)
 197 {
 198         if (clk->usecount > 0 && !(--clk->usecount)) {
 199                 _omap2_clk_disable(clk);
 200                 if (likely((u32)clk->parent))
 201                         omap2_clk_disable(clk->parent);
 202         }
 203 }
 204
 205 /*
 206  * Uses the current prcm set to tell if a rate is valid.
 207  * You can go slower, but not faster within a given rate set.
 208  */
 209 static u32 omap2_dpll_round_rate(unsigned long target_rate)
 210 {
 211         u32 high, low;
 212
 213         if ((CM_CLKSEL2_PLL & 0x3) == 1) {      /* DPLL clockout */
 214                 high = curr_prcm_set->dpll_speed * 2;
 215                 low = curr_prcm_set->dpll_speed;
 216         } else {                                /* DPLL clockout x 2 */
 217                 high = curr_prcm_set->dpll_speed;
 218                 low = curr_prcm_set->dpll_speed / 2;
 219         }
 220
 221 #ifdef DOWN_VARIABLE_DPLL
 222         if (target_rate > high)
 223                 return high;
 224         else
 225                 return target_rate;
 226 #else
 227         if (target_rate > low)
 228                 return high;
 229         else
 230                 return low;
 231 #endif
 232
 233 }
 234
 235 /*
 236  * Used for clocks that are part of CLKSEL_xyz governed clocks.
 237  * REVISIT: Maybe change to use clk->enable() functions like on omap1?
 238  */
 239 static void omap2_clksel_recalc(struct clk * clk)
 240 {
 241         u32 fixed = 0, div = 0;
 242
 243         if (clk == &dpll_ck) {
 244                 clk->rate = omap2_get_dpll_rate(clk);
 245                 fixed = 1;
 246                 div = 0;
 247         }
 248
 249         if (clk == &iva1_mpu_int_ifck) {
 250                 div = 2;
 251                 fixed = 1;
 252         }
 253
 254         if ((clk == &dss1_fck) && ((CM_CLKSEL1_CORE & (0x1f << 8)) == 0)) {
 255                 clk->rate = sys_ck.rate;
 256                 return;
 257         }
 258
 259         if (!fixed) {
 260                 div = omap2_clksel_get_divisor(clk);
 261                 if (div == 0)
 262                         return;
 263         }
 264
 265         if (div != 0) {
 266                 if (unlikely(clk->rate == clk->parent->rate / div))
 267                         return;
 268                 clk->rate = clk->parent->rate / div;
 269         }
 270
 271         if (unlikely(clk->flags & RATE_PROPAGATES))
 272                 propagate_rate(clk);
 273 }
 274
 275 /*
 276  * Finds best divider value in an array based on the source and target
 277  * rates. The divider array must be sorted with smallest divider first.
 278  */
 279 static inline u32 omap2_divider_from_table(u32 size, u32 *div_array,
 280                                            u32 src_rate, u32 tgt_rate)
 281 {
 282         int i, test_rate;
 283
 284         if (div_array == NULL)
 285                 return ~1;
 286
 287         for (i=0; i < size; i++) {
 288                 test_rate = src_rate / *div_array;
 289                 if (test_rate <= tgt_rate)
 290                         return *div_array;
 291                 ++div_array;
 292         }
 293
 294         return ~0;      /* No acceptable divider */
 295 }
 296
 297 /*
 298  * Find divisor for the given clock and target rate.
 299  *
 300  * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
 301  * they are only settable as part of virtual_prcm set.
 302  */
 303 static u32 omap2_clksel_round_rate(struct clk *tclk, u32 target_rate,
 304         u32 *new_div)
 305 {
 306         u32 gfx_div[] = {2, 3, 4};
 307         u32 sysclkout_div[] = {1, 2, 4, 8, 16};
 308         u32 dss1_div[] = {1, 2, 3, 4, 5, 6, 8, 9, 12, 16};
 309         u32 vylnq_div[] = {1, 2, 3, 4, 6, 8, 9, 12, 16, 18};
 310         u32 best_div = ~0, asize = 0;
 311         u32 *div_array = NULL;
 312
 313         switch (tclk->flags & SRC_RATE_SEL_MASK) {
 314         case CM_GFX_SEL1:
 315                 asize = 3;
 316                 div_array = gfx_div;
 317                 break;
 318         case CM_PLL_SEL1:
 319                 return omap2_dpll_round_rate(target_rate);
 320         case CM_SYSCLKOUT_SEL1:
 321                 asize = 5;
 322                 div_array = sysclkout_div;
 323                 break;
 324         case CM_CORE_SEL1:
 325                 if(tclk == &dss1_fck){
 326                         if(tclk->parent == &core_ck){
 327                                 asize = 10;
 328                                 div_array = dss1_div;
 329                         } else {
 330                                 *new_div = 0; /* fixed clk */
 331                                 return(tclk->parent->rate);
 332                         }
 333                 } else if((tclk == &vlynq_fck) && cpu_is_omap2420()){
 334                         if(tclk->parent == &core_ck){
 335                                 asize = 10;
 336                                 div_array = vylnq_div;
 337                         } else {
 338                                 *new_div = 0; /* fixed clk */
 339                                 return(tclk->parent->rate);
 340                         }
 341                 }
 342                 break;
 343         }
 344
 345         best_div = omap2_divider_from_table(asize, div_array,
 346          tclk->parent->rate, target_rate);
 347         if (best_div == ~0){
 348                 *new_div = 1;
 349                 return best_div; /* signal error */
 350         }
 351
 352         *new_div = best_div;
 353         return (tclk->parent->rate / best_div);
 354 }
 355
 356 /* Given a clock and a rate apply a clock specific rounding function */
 357 static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
 358 {
 359         u32 new_div = 0;
 360         int valid_rate;
 361
 362         if (clk->flags & RATE_FIXED)
 363                 return clk->rate;
 364
 365         if (clk->flags & RATE_CKCTL) {
 366                 valid_rate = omap2_clksel_round_rate(clk, rate, &new_div);
 367                 return valid_rate;
 368         }
 369
 370         if (clk->round_rate != 0)
 371                 return clk->round_rate(clk, rate);
 372
 373         return clk->rate;
 374 }
 375
 376 /*
 377  * Check the DLL lock state, and return tue if running in unlock mode.
 378  * This is needed to compenste for the shifted DLL value in unlock mode.
 379  */
 380 static u32 omap2_dll_force_needed(void)
 381 {
 382         u32 dll_state = SDRC_DLLA_CTRL;         /* dlla and dllb are a set */
 383
 384         if ((dll_state & (1 << 2)) == (1 << 2))
 385                 return 1;
 386         else
 387                 return 0;
 388 }
 389
 390 static u32 omap2_reprogram_sdrc(u32 level, u32 force)
 391 {
 392         u32 slow_dll_ctrl, fast_dll_ctrl, m_type;
 393         u32 prev = curr_perf_level, flags;
 394
 395         if ((curr_perf_level == level) && !force)
 396                 return prev;
 397
 398         m_type = omap2_memory_get_type();
 399         slow_dll_ctrl = omap2_memory_get_slow_dll_ctrl();
 400         fast_dll_ctrl = omap2_memory_get_fast_dll_ctrl();
 401
 402         if (level == PRCM_HALF_SPEED) {
 403                 local_irq_save(flags);
 404                 PRCM_VOLTSETUP = 0xffff;
 405                 omap2_sram_reprogram_sdrc(PRCM_HALF_SPEED,
 406                                           slow_dll_ctrl, m_type);
 407                 curr_perf_level = PRCM_HALF_SPEED;
 408                 local_irq_restore(flags);
 409         }
 410         if (level == PRCM_FULL_SPEED) {
 411                 local_irq_save(flags);
 412                 PRCM_VOLTSETUP = 0xffff;
 413                 omap2_sram_reprogram_sdrc(PRCM_FULL_SPEED,
 414                                           fast_dll_ctrl, m_type);
 415                 curr_perf_level = PRCM_FULL_SPEED;
 416                 local_irq_restore(flags);
 417         }
 418
 419         return prev;
 420 }
 421
 422 static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
 423 {
 424         u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
 425         u32 bypass = 0;
 426         struct prcm_config tmpset;
 427         int ret = -EINVAL;
 428
 429         local_irq_save(flags);
 430         cur_rate = omap2_get_dpll_rate(&dpll_ck);
 431         mult = CM_CLKSEL2_PLL & 0x3;
 432
 433         if ((rate == (cur_rate / 2)) && (mult == 2)) {
 434                 omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
 435         } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
 436                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 437         } else if (rate != cur_rate) {
 438                 valid_rate = omap2_dpll_round_rate(rate);
 439                 if (valid_rate != rate)
 440                         goto dpll_exit;
 441
 442                 if ((CM_CLKSEL2_PLL & 0x3) == 1)
 443                         low = curr_prcm_set->dpll_speed;
 444                 else
 445                         low = curr_prcm_set->dpll_speed / 2;
 446
 447                 tmpset.cm_clksel1_pll = CM_CLKSEL1_PLL;
 448                 tmpset.cm_clksel1_pll &= ~(0x3FFF << 8);
 449                 div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
 450                 tmpset.cm_clksel2_pll = CM_CLKSEL2_PLL;
 451                 tmpset.cm_clksel2_pll &= ~0x3;
 452                 if (rate > low) {
 453                         tmpset.cm_clksel2_pll |= 0x2;
 454                         mult = ((rate / 2) / 1000000);
 455                         done_rate = PRCM_FULL_SPEED;
 456                 } else {
 457                         tmpset.cm_clksel2_pll |= 0x1;
 458                         mult = (rate / 1000000);
 459                         done_rate = PRCM_HALF_SPEED;
 460                 }
 461                 tmpset.cm_clksel1_pll |= ((div << 8) | (mult << 12));
 462
 463                 /* Worst case */
 464                 tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
 465
 466                 if (rate == curr_prcm_set->xtal_speed)  /* If asking for 1-1 */
 467                         bypass = 1;
 468
 469                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1); /* For init_mem */
 470
 471                 /* Force dll lock mode */
 472                 omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
 473                                bypass);
 474
 475                 /* Errata: ret dll entry state */
 476                 omap2_init_memory_params(omap2_dll_force_needed());
 477                 omap2_reprogram_sdrc(done_rate, 0);
 478         }
 479         omap2_clksel_recalc(&dpll_ck);
 480         ret = 0;
 481
 482 dpll_exit:
 483         local_irq_restore(flags);
 484         return(ret);
 485 }
 486
 487 /* Just return the MPU speed */
 488 static void omap2_mpu_recalc(struct clk * clk)
 489 {
 490         clk->rate = curr_prcm_set->mpu_speed;
 491 }
 492
 493 /*
 494  * Look for a rate equal or less than the target rate given a configuration set.
 495  *
 496  * What's not entirely clear is "which" field represents the key field.
 497  * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
 498  * just uses the ARM rates.
 499  */
 500 static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
 501 {
 502         struct prcm_config * ptr;
 503         long highest_rate;
 504
 505         if (clk != &virt_prcm_set)
 506                 return -EINVAL;
 507
 508         highest_rate = -EINVAL;
 509
 510         for (ptr = rate_table; ptr->mpu_speed; ptr++) {
 511                 if (ptr->xtal_speed != sys_ck.rate)
 512                         continue;
 513
 514                 highest_rate = ptr->mpu_speed;
 515
 516                 /* Can check only after xtal frequency check */
 517                 if (ptr->mpu_speed <= rate)
 518                         break;
 519         }
 520         return highest_rate;
 521 }
 522
 523 /*
 524  * omap2_convert_field_to_div() - turn field value into integer divider
 525  */
 526 static u32 omap2_clksel_to_divisor(u32 div_sel, u32 field_val)
 527 {
 528         u32 i;
 529         u32 clkout_array[] = {1, 2, 4, 8, 16};
 530
 531         if ((div_sel & SRC_RATE_SEL_MASK) == CM_SYSCLKOUT_SEL1) {
 532                 for (i = 0; i < 5; i++) {
 533                         if (field_val == i)
 534                                 return clkout_array[i];
 535                 }
 536                 return ~0;
 537         } else
 538                 return field_val;
 539 }
 540
 541 /*
 542  * Returns the CLKSEL divider register value
 543  * REVISIT: This should be cleaned up to work nicely with void __iomem *
 544  */
 545 static u32 omap2_get_clksel(u32 *div_sel, u32 *field_mask,
 546                             struct clk *clk)
 547 {
 548         int ret = ~0;
 549         u32 reg_val, div_off;
 550         u32 div_addr = 0;
 551         u32 mask = ~0;
 552
 553         div_off = clk->rate_offset;
 554
 555         switch ((*div_sel & SRC_RATE_SEL_MASK)) {
 556         case CM_MPU_SEL1:
 557                 div_addr = (u32)&CM_CLKSEL_MPU;
 558                 mask = 0x1f;
 559                 break;
 560         case CM_DSP_SEL1:
 561                 div_addr = (u32)&CM_CLKSEL_DSP;
 562                 if (cpu_is_omap2420()) {
 563                         if ((div_off == 0) || (div_off == 8))
 564                                 mask = 0x1f;
 565                         else if (div_off == 5)
 566                                 mask = 0x3;
 567                 } else if (cpu_is_omap2430()) {
 568                         if (div_off == 0)
 569                                 mask = 0x1f;
 570                         else if (div_off == 5)
 571                                 mask = 0x3;
 572                 }
 573                 break;
 574         case CM_GFX_SEL1:
 575                 div_addr = (u32)&CM_CLKSEL_GFX;
 576                 if (div_off == 0)
 577                         mask = 0x7;
 578                 break;
 579         case CM_MODEM_SEL1:
 580                 div_addr = (u32)&CM_CLKSEL_MDM;
 581                 if (div_off == 0)
 582                         mask = 0xf;
 583                 break;
 584         case CM_SYSCLKOUT_SEL1:
 585                 div_addr = (u32)&PRCM_CLKOUT_CTRL;
 586                 if ((div_off == 3) || (div_off = 11))
 587                         mask= 0x3;
 588                 break;
 589         case CM_CORE_SEL1:
 590                 div_addr = (u32)&CM_CLKSEL1_CORE;
 591                 switch (div_off) {
 592                 case 0:                                 /* l3 */
 593                 case 8:                                 /* dss1 */
 594                 case 15:                                /* vylnc-2420 */
 595                 case 20:                                /* ssi */
 596                         mask = 0x1f; break;
 597                 case 5:                                 /* l4 */
 598                         mask = 0x3; break;
 599                 case 13:                                /* dss2 */
 600                         mask = 0x1; break;
 601                 case 25:                                /* usb */
 602                         mask = 0x7; break;
 603                 }
 604         }
 605
 606         *field_mask = mask;
 607
 608         if (unlikely(mask == ~0))
 609                 div_addr = 0;
 610
 611         *div_sel = div_addr;
 612
 613         if (unlikely(div_addr == 0))
 614                 return ret;
 615
 616         /* Isolate field */
 617         reg_val = __raw_readl((void __iomem *)div_addr) & (mask << div_off);
 618
 619         /* Normalize back to divider value */
 620         reg_val >>= div_off;
 621
 622         return reg_val;
 623 }
 624
 625 /*
 626  * Return divider to be applied to parent clock.
 627  * Return 0 on error.
 628  */
 629 static u32 omap2_clksel_get_divisor(struct clk *clk)
 630 {
 631         int ret = 0;
 632         u32 div, div_sel, div_off, field_mask, field_val;
 633
 634         /* isolate control register */
 635         div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 636
 637         div_off = clk->rate_offset;
 638         field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
 639         if (div_sel == 0)
 640                 return ret;
 641
 642         div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 643         div = omap2_clksel_to_divisor(div_sel, field_val);
 644
 645         return div;
 646 }
 647
 648 /* Set the clock rate for a clock source */
 649 static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
 650
 651 {
 652         int ret = -EINVAL;
 653         void __iomem * reg;
 654         u32 div_sel, div_off, field_mask, field_val, reg_val, validrate;
 655         u32 new_div = 0;
 656
 657         if (!(clk->flags & CONFIG_PARTICIPANT) && (clk->flags & RATE_CKCTL)) {
 658                 if (clk == &dpll_ck)
 659                         return omap2_reprogram_dpll(clk, rate);
 660
 661                 /* Isolate control register */
 662                 div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 663                 div_off = clk->src_offset;
 664
 665                 validrate = omap2_clksel_round_rate(clk, rate, &new_div);
 666                 if(validrate != rate)
 667                         return(ret);
 668
 669                 field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
 670                 if (div_sel == 0)
 671                         return ret;
 672
 673                 if(clk->flags & CM_SYSCLKOUT_SEL1){
 674                         switch(new_div){
 675                         case 16: field_val = 4; break;
 676                         case 8:  field_val = 3; break;
 677                         case 4:  field_val = 2; break;
 678                         case 2:  field_val = 1; break;
 679                         case 1:  field_val = 0; break;
 680                         }
 681                 }
 682                 else
 683                         field_val = new_div;
 684
 685                 reg = (void __iomem *)div_sel;
 686
 687                 reg_val = __raw_readl(reg);
 688                 reg_val &= ~(field_mask << div_off);
 689                 reg_val |= (field_val << div_off);
 690
 691                 __raw_writel(reg_val, reg);
 692                 clk->rate = clk->parent->rate / field_val;
 693
 694                 if (clk->flags & DELAYED_APP)
 695                         __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
 696                 ret = 0;
 697         } else if (clk->set_rate != 0)
 698                 ret = clk->set_rate(clk, rate);
 699
 700         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 701                 propagate_rate(clk);
 702
 703         return ret;
 704 }
 705
 706 /* Converts encoded control register address into a full address */
 707 static u32 omap2_get_src_field(u32 *type_to_addr, u32 reg_offset,
 708                                struct clk *src_clk, u32 *field_mask)
 709 {
 710         u32 val = ~0, src_reg_addr = 0, mask = 0;
 711
 712         /* Find target control register.*/
 713         switch ((*type_to_addr & SRC_RATE_SEL_MASK)) {
 714         case CM_CORE_SEL1:
 715                 src_reg_addr = (u32)&CM_CLKSEL1_CORE;
 716                 if (reg_offset == 13) {                 /* DSS2_fclk */
 717                         mask = 0x1;
 718                         if (src_clk == &sys_ck)
 719                                 val = 0;
 720                         if (src_clk == &func_48m_ck)
 721                                 val = 1;
 722                 } else if (reg_offset == 8) {           /* DSS1_fclk */
 723                         mask = 0x1f;
 724                         if (src_clk == &sys_ck)
 725                                 val = 0;
 726                         else if (src_clk == &core_ck)   /* divided clock */
 727                                 val = 0x10;             /* rate needs fixing */
 728                 } else if ((reg_offset == 15) && cpu_is_omap2420()){ /*vlnyq*/
 729                         mask = 0x1F;
 730                         if(src_clk == &func_96m_ck)
 731                                 val = 0;
 732                         else if (src_clk == &core_ck)
 733                                 val = 0x10;
 734                 }
 735                 break;
 736         case CM_CORE_SEL2:
 737                 src_reg_addr = (u32)&CM_CLKSEL2_CORE;
 738                 mask = 0x3;
 739                 if (src_clk == &func_32k_ck)
 740                         val = 0x0;
 741                 if (src_clk == &sys_ck)
 742                         val = 0x1;
 743                 if (src_clk == &alt_ck)
 744                         val = 0x2;
 745                 break;
 746         case CM_WKUP_SEL1:
 747                 src_reg_addr = (u32)&CM_CLKSEL2_CORE;
 748                 mask = 0x3;
 749                 if (src_clk == &func_32k_ck)
 750                         val = 0x0;
 751                 if (src_clk == &sys_ck)
 752                         val = 0x1;
 753                 if (src_clk == &alt_ck)
 754                         val = 0x2;
 755                 break;
 756         case CM_PLL_SEL1:
 757                 src_reg_addr = (u32)&CM_CLKSEL1_PLL;
 758                 mask = 0x1;
 759                 if (reg_offset == 0x3) {
 760                         if (src_clk == &apll96_ck)
 761                                 val = 0;
 762                         if (src_clk == &alt_ck)
 763                                 val = 1;
 764                 }
 765                 else if (reg_offset == 0x5) {
 766                         if (src_clk == &apll54_ck)
 767                                 val = 0;
 768                         if (src_clk == &alt_ck)
 769                                 val = 1;
 770                 }
 771                 break;
 772         case CM_PLL_SEL2:
 773                 src_reg_addr = (u32)&CM_CLKSEL2_PLL;
 774                 mask = 0x3;
 775                 if (src_clk == &func_32k_ck)
 776                         val = 0x0;
 777                 if (src_clk == &dpll_ck)
 778                         val = 0x2;
 779                 break;
 780         case CM_SYSCLKOUT_SEL1:
 781                 src_reg_addr = (u32)&PRCM_CLKOUT_CTRL;
 782                 mask = 0x3;
 783                 if (src_clk == &dpll_ck)
 784                         val = 0;
 785                 if (src_clk == &sys_ck)
 786                         val = 1;
 787                 if (src_clk == &func_54m_ck)
 788                         val = 2;
 789                 if (src_clk == &func_96m_ck)
 790                         val = 3;
 791                 break;
 792         }
 793
 794         if (val == ~0)                  /* Catch errors in offset */
 795                 *type_to_addr = 0;
 796         else
 797                 *type_to_addr = src_reg_addr;
 798         *field_mask = mask;
 799
 800         return val;
 801 }
 802
 803 static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
 804 {
 805         void __iomem * reg;
 806         u32 src_sel, src_off, field_val, field_mask, reg_val, rate;
 807         int ret = -EINVAL;
 808
 809         if (unlikely(clk->flags & CONFIG_PARTICIPANT))
 810                 return ret;
 811
 812         if (clk->flags & SRC_SEL_MASK) {        /* On-chip SEL collection */
 813                 src_sel = (SRC_RATE_SEL_MASK & clk->flags);
 814                 src_off = clk->src_offset;
 815
 816                 if (src_sel == 0)
 817                         goto set_parent_error;
 818
 819                 field_val = omap2_get_src_field(&src_sel, src_off, new_parent,
 820                                                 &field_mask);
 821
 822                 reg = (void __iomem *)src_sel;
 823
 824                 if (clk->usecount > 0)
 825                         _omap2_clk_disable(clk);
 826
 827                 /* Set new source value (previous dividers if any in effect) */
 828                 reg_val = __raw_readl(reg) & ~(field_mask << src_off);
 829                 reg_val |= (field_val << src_off);
 830                 __raw_writel(reg_val, reg);
 831
 832                 if (clk->flags & DELAYED_APP)
 833                         __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
 834
 835                 if (clk->usecount > 0)
 836                         _omap2_clk_enable(clk);
 837
 838                 clk->parent = new_parent;
 839
 840                 /* SRC_RATE_SEL_MASK clocks follow their parents rates.*/
 841                 if ((new_parent == &core_ck) && (clk == &dss1_fck))
 842                         clk->rate = new_parent->rate / 0x10;
 843                 else
 844                         clk->rate = new_parent->rate;
 845
 846                 if (unlikely(clk->flags & RATE_PROPAGATES))
 847                         propagate_rate(clk);
 848
 849                 return 0;
 850         } else {
 851                 clk->parent = new_parent;
 852                 rate = new_parent->rate;
 853                 omap2_clk_set_rate(clk, rate);
 854                 ret = 0;
 855         }
 856
 857  set_parent_error:
 858         return ret;
 859 }
 860
 861 /* Sets basic clocks based on the specified rate */
 862 static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
 863 {
 864         u32 flags, cur_rate, done_rate, bypass = 0;
 865         u8 cpu_mask = 0;
 866         struct prcm_config *prcm;
 867         unsigned long found_speed = 0;
 868
 869         if (clk != &virt_prcm_set)
 870                 return -EINVAL;
 871
 872         /* FIXME: Change cpu_is_omap2420() to cpu_is_omap242x() */
 873         if (cpu_is_omap2420())
 874                 cpu_mask = RATE_IN_242X;
 875         else if (cpu_is_omap2430())
 876                 cpu_mask = RATE_IN_243X;
 877
 878         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 879                 if (!(prcm->flags & cpu_mask))
 880                         continue;
 881
 882                 if (prcm->xtal_speed != sys_ck.rate)
 883                         continue;
 884
 885                 if (prcm->mpu_speed <= rate) {
 886                         found_speed = prcm->mpu_speed;
 887                         break;
 888                 }
 889         }
 890
 891         if (!found_speed) {
 892                 printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
 893          rate / 1000000);
 894                 return -EINVAL;
 895         }
 896
 897         curr_prcm_set = prcm;
 898         cur_rate = omap2_get_dpll_rate(&dpll_ck);
 899
 900         if (prcm->dpll_speed == cur_rate / 2) {
 901                 omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
 902         } else if (prcm->dpll_speed == cur_rate * 2) {
 903                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 904         } else if (prcm->dpll_speed != cur_rate) {
 905                 local_irq_save(flags);
 906
 907                 if (prcm->dpll_speed == prcm->xtal_speed)
 908                         bypass = 1;
 909
 910                 if ((prcm->cm_clksel2_pll & 0x3) == 2)
 911                         done_rate = PRCM_FULL_SPEED;
 912                 else
 913                         done_rate = PRCM_HALF_SPEED;
 914
 915                 /* MPU divider */
 916                 CM_CLKSEL_MPU = prcm->cm_clksel_mpu;
 917
 918                 /* dsp + iva1 div(2420), iva2.1(2430) */
 919                 CM_CLKSEL_DSP = prcm->cm_clksel_dsp;
 920
 921                 CM_CLKSEL_GFX = prcm->cm_clksel_gfx;
 922
 923                 /* Major subsystem dividers */
 924                 CM_CLKSEL1_CORE = prcm->cm_clksel1_core;
 925                 if (cpu_is_omap2430())
 926                         CM_CLKSEL_MDM = prcm->cm_clksel_mdm;
 927
 928                 /* x2 to enter init_mem */
 929                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 930
 931                 omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
 932                                bypass);
 933
 934                 omap2_init_memory_params(omap2_dll_force_needed());
 935                 omap2_reprogram_sdrc(done_rate, 0);
 936
 937                 local_irq_restore(flags);
 938         }
 939         omap2_clksel_recalc(&dpll_ck);
 940
 941         return 0;
 942 }
 943
 944 /*-------------------------------------------------------------------------
 945  * Omap2 clock reset and init functions
 946  *-------------------------------------------------------------------------*/
 947
 948 static struct clk_functions omap2_clk_functions = {
 949         .clk_enable             = omap2_clk_enable,
 950         .clk_disable            = omap2_clk_disable,
 951         .clk_round_rate         = omap2_clk_round_rate,
 952         .clk_set_rate           = omap2_clk_set_rate,
 953         .clk_set_parent         = omap2_clk_set_parent,
 954 };
 955
 956 static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
 957 {
 958         u32 div, aplls, sclk = 13000000;
 959
 960         aplls = CM_CLKSEL1_PLL;
 961         aplls &= ((1 << 23) | (1 << 24) | (1 << 25));
 962         aplls >>= 23;                   /* Isolate field, 0,2,3 */
 963
 964         if (aplls == 0)
 965                 sclk = 19200000;
 966         else if (aplls == 2)
 967                 sclk = 13000000;
 968         else if (aplls == 3)
 969                 sclk = 12000000;
 970
 971         div = PRCM_CLKSRC_CTRL;
 972         div &= ((1 << 7) | (1 << 6));
 973         div >>= sys->rate_offset;
 974
 975         osc->rate = sclk * div;
 976         sys->rate = sclk;
 977 }
 978
 979 #ifdef CONFIG_OMAP_RESET_CLOCKS
 980 static void __init omap2_disable_unused_clocks(void)
 981 {
 982         struct clk *ck;
 983         u32 regval32;
 984
 985         list_for_each_entry(ck, &clocks, node) {
 986                 if (ck->usecount > 0 || (ck->flags & ALWAYS_ENABLED) ||
 987                         ck->enable_reg == 0)
 988                         continue;
 989
 990                 regval32 = __raw_readl(ck->enable_reg);
 991                 if ((regval32 & (1 << ck->enable_bit)) == 0)
 992                         continue;
 993
 994                 printk(KERN_INFO "Disabling unused clock \"%s\"\n", ck->name);
 995                 _omap2_clk_disable(ck);
 996         }
 997 }
 998 late_initcall(omap2_disable_unused_clocks);
 999 #endif
1000
1001 /*
1002  * Switch the MPU rate if specified on cmdline.
1003  * We cannot do this early until cmdline is parsed.
1004  */
1005 static int __init omap2_clk_arch_init(void)
1006 {
1007         if (!mpurate)
1008                 return -EINVAL;
1009
1010         if (omap2_select_table_rate(&virt_prcm_set, mpurate))
1011                 printk(KERN_ERR "Could not find matching MPU rate\n");
1012
1013         propagate_rate(&osc_ck);                /* update main root fast */
1014         propagate_rate(&func_32k_ck);           /* update main root slow */
1015
1016         printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
1017                "%ld.%01ld/%ld/%ld MHz\n",
1018                (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1019                (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1020
1021         return 0;
1022 }
1023 arch_initcall(omap2_clk_arch_init);
1024
1025 int __init omap2_clk_init(void)
1026 {
1027         struct prcm_config *prcm;
1028         struct clk ** clkp;
1029         u32 clkrate;
1030
1031         clk_init(&omap2_clk_functions);
1032         omap2_get_crystal_rate(&osc_ck, &sys_ck);
1033
1034         for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
1035              clkp++) {
1036
1037                 if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
1038                         clk_register(*clkp);
1039                         continue;
1040                 }
1041
1042                 if ((*clkp)->flags & CLOCK_IN_OMAP243X && cpu_is_omap2430()) {
1043                         clk_register(*clkp);
1044                         continue;
1045                 }
1046         }
1047
1048         /* Check the MPU rate set by bootloader */
1049         clkrate = omap2_get_dpll_rate(&dpll_ck);
1050         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
1051                 if (prcm->xtal_speed != sys_ck.rate)
1052                         continue;
1053                 if (prcm->dpll_speed <= clkrate)
1054                          break;
1055         }
1056         curr_prcm_set = prcm;
1057
1058         propagate_rate(&osc_ck);                /* update main root fast */
1059         propagate_rate(&func_32k_ck);           /* update main root slow */
1060
1061         printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
1062                "%ld.%01ld/%ld/%ld MHz\n",
1063                (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1064                (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1065
1066         /*
1067          * Only enable those clocks we will need, let the drivers
1068          * enable other clocks as necessary
1069          */
1070         clk_enable(&sync_32k_ick);
1071         clk_enable(&omapctrl_ick);
1072         if (cpu_is_omap2430())
1073                 clk_enable(&sdrc_ick);
1074
1075         return 0;
1076 }