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
  26 #include <asm/io.h>
  27
  28 #include <asm/hardware/clock.h>
  29 #include <asm/arch/clock.h>
  30 #include <asm/arch/sram.h>
  31 #include <asm/arch/prcm.h>
  32
  33 #include "clock.h"
  34
  35 //#define DOWN_VARIABLE_DPLL 1                  /* Experimental */
  36
  37 static struct prcm_config *curr_prcm_set;
  38 static struct memory_timings mem_timings;
  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         int dpll_clk, 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 = (tclk->parent->rate * dpll_mult) / (dpll_div + 1);
  62         amult = CM_CLKSEL2_PLL & 0x3;
  63         dpll_clk *= amult;
  64
  65         return dpll_clk;
  66 }
  67
  68 static void omap2_followparent_recalc(struct clk *clk)
  69 {
  70         followparent_recalc(clk);
  71 }
  72
  73 static void omap2_propagate_rate(struct clk * clk)
  74 {
  75         if (!(clk->flags & RATE_FIXED))
  76                 clk->rate = clk->parent->rate;
  77
  78         propagate_rate(clk);
  79 }
  80
  81 /* Enable an APLL if off */
  82 static void omap2_clk_fixed_enable(struct clk *clk)
  83 {
  84         u32 cval, i=0;
  85
  86         if (clk->enable_bit == 0xff)                    /* Parent will do it */
  87                 return;
  88
  89         cval = CM_CLKEN_PLL;
  90
  91         if ((cval & (0x3 << clk->enable_bit)) == (0x3 << clk->enable_bit))
  92                 return;
  93
  94         cval &= ~(0x3 << clk->enable_bit);
  95         cval |= (0x3 << clk->enable_bit);
  96         CM_CLKEN_PLL = cval;
  97
  98         if (clk == &apll96_ck)
  99                 cval = (1 << 8);
 100         else if (clk == &apll54_ck)
 101                 cval = (1 << 6);
 102
 103         while (!CM_IDLEST_CKGEN & cval) {               /* Wait for lock */
 104                 ++i;
 105                 udelay(1);
 106                 if (i == 100000)
 107                         break;
 108         }
 109 }
 110
 111 /* Enables clock without considering parent dependencies or use count
 112  * REVISIT: Maybe change this to use clk->enable like on omap1?
 113  */
 114 static int omap2_clk_enable(struct clk * clk)
 115 {
 116         u32 regval32;
 117
 118         if (clk->flags & ALWAYS_ENABLED)
 119                 return 0;
 120
 121         if (unlikely(clk->enable_reg == 0)) {
 122                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 123                        clk->name);
 124                 return 0;
 125         }
 126
 127         if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
 128                 omap2_clk_fixed_enable(clk);
 129                 return 0;
 130         }
 131
 132         regval32 = __raw_readl(clk->enable_reg);
 133         regval32 |= (1 << clk->enable_bit);
 134         __raw_writel(regval32, clk->enable_reg);
 135
 136         return 0;
 137 }
 138
 139 /* Stop APLL */
 140 static void omap2_clk_fixed_disable(struct clk *clk)
 141 {
 142         u32 cval;
 143
 144         if(clk->enable_bit == 0xff)             /* let parent off do it */
 145                 return;
 146
 147         cval = CM_CLKEN_PLL;
 148         cval &= ~(0x3 << clk->enable_bit);
 149         CM_CLKEN_PLL = cval;
 150 }
 151
 152 /* Disables clock without considering parent dependencies or use count */
 153 static void omap2_clk_disable(struct clk *clk)
 154 {
 155         u32 regval32;
 156
 157         if (clk->enable_reg == 0)
 158                 return;
 159
 160         if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
 161                 omap2_clk_fixed_disable(clk);
 162                 return;
 163         }
 164
 165         regval32 = __raw_readl(clk->enable_reg);
 166         regval32 &= ~(1 << clk->enable_bit);
 167         __raw_writel(regval32, clk->enable_reg);
 168 }
 169
 170 static int omap2_clk_use(struct clk *clk)
 171 {
 172         int ret = 0;
 173
 174         if (clk->usecount++ == 0) {
 175                 if (likely((u32)clk->parent))
 176                         ret = omap2_clk_use(clk->parent);
 177
 178                 if (unlikely(ret != 0)) {
 179                         clk->usecount--;
 180                         return ret;
 181                 }
 182
 183                 ret = omap2_clk_enable(clk);
 184
 185                 if (unlikely(ret != 0) && clk->parent) {
 186                         omap2_clk_unuse(clk->parent);
 187                         clk->usecount--;
 188                 }
 189         }
 190
 191         return ret;
 192 }
 193
 194 static void omap2_clk_unuse(struct clk *clk)
 195 {
 196         if (clk->usecount > 0 && !(--clk->usecount)) {
 197                 omap2_clk_disable(clk);
 198                 if (likely((u32)clk->parent))
 199                         omap2_clk_unuse(clk->parent);
 200         }
 201 }
 202
 203 /*
 204  * Uses the current prcm set to tell if a rate is valid.
 205  * You can go slower, but not faster within a given rate set.
 206  */
 207 static u32 omap2_dpll_round_rate(unsigned long target_rate)
 208 {
 209         u32 high, low;
 210
 211         if ((CM_CLKSEL2_PLL & 0x3) == 1) {      /* DPLL clockout */
 212                 high = curr_prcm_set->dpll_speed * 2;
 213                 low = curr_prcm_set->dpll_speed;
 214         } else {                                /* DPLL clockout x 2 */
 215                 high = curr_prcm_set->dpll_speed;
 216                 low = curr_prcm_set->dpll_speed / 2;
 217         }
 218
 219 #ifdef DOWN_VARIABLE_DPLL
 220         if (target_rate > high)
 221                 return high;
 222         else
 223                 return target_rate;
 224 #else
 225         if (target_rate > low)
 226                 return high;
 227         else
 228                 return low;
 229 #endif
 230
 231 }
 232
 233 /*
 234  * Used for clocks that are part of CLKSEL_xyz governed clocks.
 235  * REVISIT: Maybe change to use clk->enable() functions like on omap1?
 236  */
 237 static void omap2_clksel_recalc(struct clk * clk)
 238 {
 239         u32 fixed = 0, div = 0;
 240
 241         if (clk == &dpll_ck) {
 242                 clk->rate = omap2_get_dpll_rate(clk);
 243                 fixed = 1;
 244                 div = 0;
 245         }
 246
 247         if (clk == &iva1_mpu_int_ifck) {
 248                 div = 2;
 249                 fixed = 1;
 250         }
 251
 252         if ((clk == &dss1_fck) && ((CM_CLKSEL1_CORE & (0x1f << 8)) == 0)) {
 253                 clk->rate = sys_ck.rate;
 254                 return;
 255         }
 256
 257         if (!fixed) {
 258                 div = omap2_clksel_get_divisor(clk);
 259                 if (div == 0)
 260                         return;
 261         }
 262
 263         if (div != 0) {
 264                 if (unlikely(clk->rate == clk->parent->rate / div))
 265                         return;
 266                 clk->rate = clk->parent->rate / div;
 267         }
 268
 269         if (unlikely(clk->flags & RATE_PROPAGATES))
 270                 propagate_rate(clk);
 271 }
 272
 273 /*
 274  * Finds best divider value in an array based on the source and target
 275  * rates. The divider array must be sorted with smallest divider first.
 276  */
 277 static inline u32 omap2_divider_from_table(u32 size, u32 *div_array,
 278                                            u32 src_rate, u32 tgt_rate)
 279 {
 280         int i, test_rate;
 281
 282         if (div_array == NULL)
 283                 return ~1;
 284
 285         for (i=0; i < size; i++) {
 286                 test_rate = src_rate / *div_array;
 287                 if (test_rate <= tgt_rate)
 288                         return *div_array;
 289                 ++div_array;
 290         }
 291
 292         return ~0;      /* No acceptable divider */
 293 }
 294
 295 /*
 296  * Find divisor for the given clock and target rate.
 297  *
 298  * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
 299  * they are only settable as part of virtual_prcm set.
 300  */
 301 static u32 omap2_clksel_round_rate(struct clk *tclk, u32 target_rate,
 302         u32 *new_div)
 303 {
 304         u32 gfx_div[] = {2, 3, 4};
 305         u32 sysclkout_div[] = {1, 2, 4, 8, 16};
 306         u32 dss1_div[] = {1, 2, 3, 4, 5, 6, 8, 9, 12, 16};
 307         u32 vylnq_div[] = {1, 2, 3, 4, 6, 8, 9, 12, 16, 18};
 308         u32 best_div = ~0, asize = 0;
 309         u32 *div_array = NULL;
 310
 311         switch (tclk->flags & SRC_RATE_SEL_MASK) {
 312         case CM_GFX_SEL1:
 313                 asize = 3;
 314                 div_array = gfx_div;
 315                 break;
 316         case CM_PLL_SEL1:
 317                 return omap2_dpll_round_rate(target_rate);
 318         case CM_SYSCLKOUT_SEL1:
 319                 asize = 5;
 320                 div_array = sysclkout_div;
 321                 break;
 322         case CM_CORE_SEL1:
 323                 if(tclk == &dss1_fck){
 324                         if(tclk->parent == &core_ck){
 325                                 asize = 10;
 326                                 div_array = dss1_div;
 327                         } else {
 328                                 *new_div = 0; /* fixed clk */
 329                                 return(tclk->parent->rate);
 330                         }
 331                 } else if((tclk == &vlynq_fck) && cpu_is_omap2420()){
 332                         if(tclk->parent == &core_ck){
 333                                 asize = 10;
 334                                 div_array = vylnq_div;
 335                         } else {
 336                                 *new_div = 0; /* fixed clk */
 337                                 return(tclk->parent->rate);
 338                         }
 339                 }
 340                 break;
 341         }
 342
 343         best_div = omap2_divider_from_table(asize, div_array,
 344          tclk->parent->rate, target_rate);
 345         if (best_div == ~0){
 346                 *new_div = 1;
 347                 return best_div; /* signal error */
 348         }
 349
 350         *new_div = best_div;
 351         return (tclk->parent->rate / best_div);
 352 }
 353
 354 /* Given a clock and a rate apply a clock specific rounding function */
 355 static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
 356 {
 357         u32 new_div = 0;
 358         int valid_rate;
 359
 360         if (clk->flags & RATE_FIXED)
 361                 return clk->rate;
 362
 363         if (clk->flags & RATE_CKCTL) {
 364                 valid_rate = omap2_clksel_round_rate(clk, rate, &new_div);
 365                 return valid_rate;
 366         }
 367
 368         if (clk->round_rate != 0)
 369                 return clk->round_rate(clk, rate);
 370
 371         return clk->rate;
 372 }
 373
 374 /*
 375  * Check the DLL lock state, and return tue if running in unlock mode.
 376  * This is needed to compenste for the shifted DLL value in unlock mode.
 377  */
 378 static u32 omap2_dll_force_needed(void)
 379 {
 380         u32 dll_state = SDRC_DLLA_CTRL;         /* dlla and dllb are a set */
 381
 382         if ((dll_state & (1 << 2)) == (1 << 2))
 383                 return 1;
 384         else
 385                 return 0;
 386 }
 387
 388 static void omap2_init_memory_params(u32 force_lock_to_unlock_mode)
 389 {
 390         unsigned long dll_cnt;
 391         u32 fast_dll = 0;
 392
 393         mem_timings.m_type = !((SDRC_MR_0 & 0x3) == 0x1); /* DDR = 1, SDR = 0 */
 394
 395         /* 2422 es2.05 and beyond has a single SIP DDR instead of 2 like others.
 396          * In the case of 2422, its ok to use CS1 instead of CS0.
 397          */
 398
 399 #if 0   /* FIXME: Enable after 24xx cpu detection works */
 400         ctype = get_cpu_type();
 401         if (cpu_is_omap2422())
 402                 mem_timings.base_cs = 1;
 403         else
 404 #endif
 405                 mem_timings.base_cs = 0;
 406
 407         if (mem_timings.m_type != M_DDR)
 408                 return;
 409
 410         /* With DDR we need to determine the low frequency DLL value */
 411         if (((mem_timings.fast_dll_ctrl & (1 << 2)) == M_LOCK_CTRL))
 412                 mem_timings.dll_mode = M_UNLOCK;
 413         else
 414                 mem_timings.dll_mode = M_LOCK;
 415
 416         if (mem_timings.base_cs == 0) {
 417                 fast_dll = SDRC_DLLA_CTRL;
 418                 dll_cnt = SDRC_DLLA_STATUS & 0xff00;
 419         } else {
 420                 fast_dll = SDRC_DLLB_CTRL;
 421                 dll_cnt = SDRC_DLLB_STATUS & 0xff00;
 422         }
 423         if (force_lock_to_unlock_mode) {
 424                 fast_dll &= ~0xff00;
 425                 fast_dll |= dll_cnt;            /* Current lock mode */
 426         }
 427         mem_timings.fast_dll_ctrl = fast_dll;
 428
 429         /* No disruptions, DDR will be offline & C-ABI not followed */
 430         omap2_sram_ddr_init(&mem_timings.slow_dll_ctrl,
 431                             mem_timings.fast_dll_ctrl,
 432                             mem_timings.base_cs,
 433                             force_lock_to_unlock_mode);
 434         mem_timings.slow_dll_ctrl &= 0xff00;    /* Keep lock value */
 435
 436         /* Turn status into unlock ctrl */
 437         mem_timings.slow_dll_ctrl |=
 438                 ((mem_timings.fast_dll_ctrl & 0xF) | (1 << 2));
 439
 440         /* 90 degree phase for anything below 133Mhz */
 441         mem_timings.slow_dll_ctrl |= (1 << 1);
 442 }
 443
 444 static u32 omap2_reprogram_sdrc(u32 level, u32 force)
 445 {
 446         u32 prev = curr_perf_level, flags;
 447
 448         if ((curr_perf_level == level) && !force)
 449                 return prev;
 450
 451         if (level == PRCM_HALF_SPEED) {
 452                 local_irq_save(flags);
 453                 PRCM_VOLTSETUP = 0xffff;
 454                 omap2_sram_reprogram_sdrc(PRCM_HALF_SPEED,
 455                                           mem_timings.slow_dll_ctrl,
 456                                           mem_timings.m_type);
 457                 curr_perf_level = PRCM_HALF_SPEED;
 458                 local_irq_restore(flags);
 459         }
 460         if (level == PRCM_FULL_SPEED) {
 461                 local_irq_save(flags);
 462                 PRCM_VOLTSETUP = 0xffff;
 463                 omap2_sram_reprogram_sdrc(PRCM_FULL_SPEED,
 464                                           mem_timings.fast_dll_ctrl,
 465                                           mem_timings.m_type);
 466                 curr_perf_level = PRCM_FULL_SPEED;
 467                 local_irq_restore(flags);
 468         }
 469
 470         return prev;
 471 }
 472
 473 static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
 474 {
 475         u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
 476         u32 bypass = 0;
 477         struct prcm_config tmpset;
 478         int ret = -EINVAL;
 479
 480         local_irq_save(flags);
 481         cur_rate = omap2_get_dpll_rate(&dpll_ck);
 482         mult = CM_CLKSEL2_PLL & 0x3;
 483
 484         if ((rate == (cur_rate / 2)) && (mult == 2)) {
 485                 omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
 486         } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
 487                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 488         } else if (rate != cur_rate) {
 489                 valid_rate = omap2_dpll_round_rate(rate);
 490                 if (valid_rate != rate)
 491                         goto dpll_exit;
 492
 493                 if ((CM_CLKSEL2_PLL & 0x3) == 1)
 494                         low = curr_prcm_set->dpll_speed;
 495                 else
 496                         low = curr_prcm_set->dpll_speed / 2;
 497
 498                 tmpset.cm_clksel1_pll = CM_CLKSEL1_PLL;
 499                 tmpset.cm_clksel1_pll &= ~(0x3FFF << 8);
 500                 div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
 501                 tmpset.cm_clksel2_pll = CM_CLKSEL2_PLL;
 502                 tmpset.cm_clksel2_pll &= ~0x3;
 503                 if (rate > low) {
 504                         tmpset.cm_clksel2_pll |= 0x2;
 505                         mult = ((rate / 2) / 1000000);
 506                         done_rate = PRCM_FULL_SPEED;
 507                 } else {
 508                         tmpset.cm_clksel2_pll |= 0x1;
 509                         mult = (rate / 1000000);
 510                         done_rate = PRCM_HALF_SPEED;
 511                 }
 512                 tmpset.cm_clksel1_pll |= ((div << 8) | (mult << 12));
 513
 514                 /* Worst case */
 515                 tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
 516
 517                 if (rate == curr_prcm_set->xtal_speed)  /* If asking for 1-1 */
 518                         bypass = 1;
 519
 520                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1); /* For init_mem */
 521
 522                 /* Force dll lock mode */
 523                 omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
 524                                bypass);
 525
 526                 /* Errata: ret dll entry state */
 527                 omap2_init_memory_params(omap2_dll_force_needed());
 528                 omap2_reprogram_sdrc(done_rate, 0);
 529         }
 530         omap2_clksel_recalc(&dpll_ck);
 531         ret = 0;
 532
 533 dpll_exit:
 534         local_irq_restore(flags);
 535         return(ret);
 536 }
 537
 538 /* Just return the MPU speed */
 539 static void omap2_mpu_recalc(struct clk * clk)
 540 {
 541         clk->rate = curr_prcm_set->mpu_speed;
 542 }
 543
 544 /*
 545  * Look for a rate equal or less than the target rate given a configuration set.
 546  *
 547  * What's not entirely clear is "which" field represents the key field.
 548  * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
 549  * just uses the ARM rates.
 550  */
 551 static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
 552 {
 553         struct prcm_config * ptr;
 554         long highest_rate;
 555
 556         if (clk != &virt_prcm_set)
 557                 return -EINVAL;
 558
 559         highest_rate = -EINVAL;
 560
 561         for (ptr = rate_table; ptr->mpu_speed; ptr++) {
 562                 if (ptr->xtal_speed != sys_ck.rate)
 563                         continue;
 564
 565                 highest_rate = ptr->mpu_speed;
 566
 567                 /* Can check only after xtal frequency check */
 568                 if (ptr->mpu_speed <= rate)
 569                         break;
 570         }
 571         return highest_rate;
 572 }
 573
 574 /*
 575  * omap2_convert_field_to_div() - turn field value into integer divider
 576  */
 577 static u32 omap2_clksel_to_divisor(u32 div_sel, u32 field_val)
 578 {
 579         u32 i;
 580         u32 clkout_array[] = {1, 2, 4, 8, 16};
 581
 582         if ((div_sel & SRC_RATE_SEL_MASK) == CM_SYSCLKOUT_SEL1) {
 583                 for (i = 0; i < 5; i++) {
 584                         if (field_val == i)
 585                                 return clkout_array[i];
 586                 }
 587                 return ~0;
 588         } else
 589                 return field_val;
 590 }
 591
 592 /*
 593  * Returns the CLKSEL divider register value
 594  * REVISIT: This should be cleaned up to work nicely with void __iomem *
 595  */
 596 static u32 omap2_get_clksel(u32 *div_sel, u32 *field_mask,
 597                             struct clk *clk)
 598 {
 599         int ret = ~0;
 600         u32 reg_val, div_off;
 601         u32 div_addr = 0;
 602         u32 mask = ~0;
 603
 604         div_off = clk->rate_offset;
 605
 606         switch ((*div_sel & SRC_RATE_SEL_MASK)) {
 607         case CM_MPU_SEL1:
 608                 div_addr = (u32)&CM_CLKSEL_MPU;
 609                 mask = 0x1f;
 610                 break;
 611         case CM_DSP_SEL1:
 612                 div_addr = (u32)&CM_CLKSEL_DSP;
 613                 if (cpu_is_omap2420()) {
 614                         if ((div_off == 0) || (div_off == 8))
 615                                 mask = 0x1f;
 616                         else if (div_off == 5)
 617                                 mask = 0x3;
 618                 } else if (cpu_is_omap2430()) {
 619                         if (div_off == 0)
 620                                 mask = 0x1f;
 621                         else if (div_off == 5)
 622                                 mask = 0x3;
 623                 }
 624                 break;
 625         case CM_GFX_SEL1:
 626                 div_addr = (u32)&CM_CLKSEL_GFX;
 627                 if (div_off == 0)
 628                         mask = 0x7;
 629                 break;
 630         case CM_MODEM_SEL1:
 631                 div_addr = (u32)&CM_CLKSEL_MDM;
 632                 if (div_off == 0)
 633                         mask = 0xf;
 634                 break;
 635         case CM_SYSCLKOUT_SEL1:
 636                 div_addr = (u32)&PRCM_CLKOUT_CTRL;
 637                 if ((div_off == 3) || (div_off = 11))
 638                         mask= 0x3;
 639                 break;
 640         case CM_CORE_SEL1:
 641                 div_addr = (u32)&CM_CLKSEL1_CORE;
 642                 switch (div_off) {
 643                 case 0:                                 /* l3 */
 644                 case 8:                                 /* dss1 */
 645                 case 15:                                /* vylnc-2420 */
 646                 case 20:                                /* ssi */
 647                         mask = 0x1f; break;
 648                 case 5:                                 /* l4 */
 649                         mask = 0x3; break;
 650                 case 13:                                /* dss2 */
 651                         mask = 0x1; break;
 652                 case 25:                                /* usb */
 653                         mask = 0xf; break;
 654                 }
 655         }
 656
 657         *field_mask = mask;
 658
 659         if (unlikely(mask == ~0))
 660                 div_addr = 0;
 661
 662         *div_sel = div_addr;
 663
 664         if (unlikely(div_addr == 0))
 665                 return ret;
 666
 667         /* Isolate field */
 668         reg_val = __raw_readl((void __iomem *)div_addr) & (mask << div_off);
 669
 670         /* Normalize back to divider value */
 671         reg_val >>= div_off;
 672
 673         return reg_val;
 674 }
 675
 676 /*
 677  * Return divider to be applied to parent clock.
 678  * Return 0 on error.
 679  */
 680 static u32 omap2_clksel_get_divisor(struct clk *clk)
 681 {
 682         int ret = 0;
 683         u32 div, div_sel, div_off, field_mask, field_val;
 684
 685         /* isolate control register */
 686         div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 687
 688         div_off = clk->rate_offset;
 689         field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
 690         if (div_sel == 0)
 691                 return ret;
 692
 693         div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 694         div = omap2_clksel_to_divisor(div_sel, field_val);
 695
 696         return div;
 697 }
 698
 699 /* Set the clock rate for a clock source */
 700 static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
 701
 702 {
 703         int ret = -EINVAL;
 704         void __iomem * reg;
 705         u32 div_sel, div_off, field_mask, field_val, reg_val, validrate;
 706         u32 new_div = 0;
 707
 708         if (!(clk->flags & CONFIG_PARTICIPANT) && (clk->flags & RATE_CKCTL)) {
 709                 if (clk == &dpll_ck)
 710                         return omap2_reprogram_dpll(clk, rate);
 711
 712                 /* Isolate control register */
 713                 div_sel = (SRC_RATE_SEL_MASK & clk->flags);
 714                 div_off = clk->src_offset;
 715
 716                 validrate = omap2_clksel_round_rate(clk, rate, &new_div);
 717                 if(validrate != rate)
 718                         return(ret);
 719
 720                 field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
 721                 if (div_sel == 0)
 722                         return ret;
 723
 724                 if(clk->flags & CM_SYSCLKOUT_SEL1){
 725                         switch(new_div){
 726                         case 16: field_val = 4; break;
 727                         case 8:  field_val = 3; break;
 728                         case 4:  field_val = 2; break;
 729                         case 2:  field_val = 1; break;
 730                         case 1:  field_val = 0; break;
 731                         }
 732                 }
 733                 else
 734                         field_val = new_div;
 735
 736                 reg = (void __iomem *)div_sel;
 737
 738                 reg_val = __raw_readl(reg);
 739                 reg_val &= ~(field_mask << div_off);
 740                 reg_val |= (field_val << div_off);
 741
 742                 __raw_writel(reg_val, reg);
 743                 clk->rate = clk->parent->rate / field_val;
 744
 745                 if (clk->flags & DELAYED_APP)
 746                         __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
 747                 ret = 0;
 748         } else if (clk->set_rate != 0)
 749                 ret = clk->set_rate(clk, rate);
 750
 751         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 752                 propagate_rate(clk);
 753
 754         return ret;
 755 }
 756
 757 /* Converts encoded control register address into a full address */
 758 static u32 omap2_get_src_field(u32 *type_to_addr, u32 reg_offset,
 759                                struct clk *src_clk, u32 *field_mask)
 760 {
 761         u32 val = ~0, src_reg_addr = 0, mask = 0;
 762
 763         /* Find target control register.*/
 764         switch ((*type_to_addr & SRC_RATE_SEL_MASK)) {
 765         case CM_CORE_SEL1:
 766                 src_reg_addr = (u32)&CM_CLKSEL1_CORE;
 767                 if (reg_offset == 13) {                 /* DSS2_fclk */
 768                         mask = 0x1;
 769                         if (src_clk == &sys_ck)
 770                                 val = 0;
 771                         if (src_clk == &func_48m_ck)
 772                                 val = 1;
 773                 } else if (reg_offset == 8) {           /* DSS1_fclk */
 774                         mask = 0x1f;
 775                         if (src_clk == &sys_ck)
 776                                 val = 0;
 777                         else if (src_clk == &core_ck)   /* divided clock */
 778                                 val = 0x10;             /* rate needs fixing */
 779                 } else if ((reg_offset == 15) && cpu_is_omap2420()){ /*vlnyq*/
 780                         mask = 0x1F;
 781                         if(src_clk == &func_96m_ck)
 782                                 val = 0;
 783                         else if (src_clk == &core_ck)
 784                                 val = 0x10;
 785                 }
 786                 break;
 787         case CM_CORE_SEL2:
 788                 src_reg_addr = (u32)&CM_CLKSEL2_CORE;
 789                 mask = 0x3;
 790                 if (src_clk == &func_32k_ck)
 791                         val = 0x0;
 792                 if (src_clk == &sys_ck)
 793                         val = 0x1;
 794                 if (src_clk == &alt_ck)
 795                         val = 0x2;
 796                 break;
 797         case CM_WKUP_SEL1:
 798                 src_reg_addr = (u32)&CM_CLKSEL2_CORE;
 799                 mask = 0x3;
 800                 if (src_clk == &func_32k_ck)
 801                         val = 0x0;
 802                 if (src_clk == &sys_ck)
 803                         val = 0x1;
 804                 if (src_clk == &alt_ck)
 805                         val = 0x2;
 806                 break;
 807         case CM_PLL_SEL1:
 808                 src_reg_addr = (u32)&CM_CLKSEL1_PLL;
 809                 mask = 0x1;
 810                 if (reg_offset == 0x3) {
 811                         if (src_clk == &apll96_ck)
 812                                 val = 0;
 813                         if (src_clk == &alt_ck)
 814                                 val = 1;
 815                 }
 816                 else if (reg_offset == 0x5) {
 817                         if (src_clk == &apll54_ck)
 818                                 val = 0;
 819                         if (src_clk == &alt_ck)
 820                                 val = 1;
 821                 }
 822                 break;
 823         case CM_PLL_SEL2:
 824                 src_reg_addr = (u32)&CM_CLKSEL2_PLL;
 825                 mask = 0x3;
 826                 if (src_clk == &func_32k_ck)
 827                         val = 0x0;
 828                 if (src_clk == &dpll_ck)
 829                         val = 0x2;
 830                 break;
 831         case CM_SYSCLKOUT_SEL1:
 832                 src_reg_addr = (u32)&PRCM_CLKOUT_CTRL;
 833                 mask = 0x3;
 834                 if (src_clk == &dpll_ck)
 835                         val = 0;
 836                 if (src_clk == &sys_ck)
 837                         val = 1;
 838                 if (src_clk == &func_54m_ck)
 839                         val = 2;
 840                 if (src_clk == &func_96m_ck)
 841                         val = 3;
 842                 break;
 843         }
 844
 845         if (val == ~0)                  /* Catch errors in offset */
 846                 *type_to_addr = 0;
 847         else
 848                 *type_to_addr = src_reg_addr;
 849         *field_mask = mask;
 850
 851         return val;
 852 }
 853
 854 static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
 855 {
 856         void __iomem * reg;
 857         u32 src_sel, src_off, field_val, field_mask, reg_val, rate;
 858         int ret = -EINVAL;
 859
 860         if (unlikely(clk->flags & CONFIG_PARTICIPANT))
 861                 return ret;
 862
 863         if (clk->flags & SRC_SEL_MASK) {        /* On-chip SEL collection */
 864                 src_sel = (SRC_RATE_SEL_MASK & clk->flags);
 865                 src_off = clk->src_offset;
 866
 867                 if (src_sel == 0)
 868                         goto set_parent_error;
 869
 870                 field_val = omap2_get_src_field(&src_sel, src_off, new_parent,
 871                                                 &field_mask);
 872
 873                 reg = (void __iomem *)src_sel;
 874
 875                 if (clk->usecount > 0)
 876                         omap2_clk_disable(clk);
 877
 878                 /* Set new source value (previous dividers if any in effect) */
 879                 reg_val = __raw_readl(reg) & ~(field_mask << src_off);
 880                 reg_val |= (field_val << src_off);
 881                 __raw_writel(reg_val, reg);
 882
 883                 if (clk->flags & DELAYED_APP)
 884                         __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
 885
 886                 if (clk->usecount > 0)
 887                         omap2_clk_enable(clk);
 888
 889                 clk->parent = new_parent;
 890
 891                 /* SRC_RATE_SEL_MASK clocks follow their parents rates.*/
 892                 if ((new_parent == &core_ck) && (clk == &dss1_fck))
 893                         clk->rate = new_parent->rate / 0x10;
 894                 else
 895                         clk->rate = new_parent->rate;
 896
 897                 if (unlikely(clk->flags & RATE_PROPAGATES))
 898                         propagate_rate(clk);
 899
 900                 return 0;
 901         } else {
 902                 clk->parent = new_parent;
 903                 rate = new_parent->rate;
 904                 omap2_clk_set_rate(clk, rate);
 905                 ret = 0;
 906         }
 907
 908  set_parent_error:
 909         return ret;
 910 }
 911
 912 /* Sets basic clocks based on the specified rate */
 913 static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
 914 {
 915         u32 flags, cur_rate, done_rate, bypass = 0;
 916         u8 cpu_mask = 0;
 917         struct prcm_config *prcm;
 918         unsigned long found_speed = 0;
 919
 920         if (clk != &virt_prcm_set)
 921                 return -EINVAL;
 922
 923         /* FIXME: Change cpu_is_omap2420() to cpu_is_omap242x() */
 924         if (cpu_is_omap2420())
 925                 cpu_mask = RATE_IN_242X;
 926         else if (cpu_is_omap2430())
 927                 cpu_mask = RATE_IN_243X;
 928
 929         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 930                 if (!(prcm->flags & cpu_mask))
 931                         continue;
 932
 933                 if (prcm->xtal_speed != sys_ck.rate)
 934                         continue;
 935
 936                 if (prcm->mpu_speed <= rate) {
 937                         found_speed = prcm->mpu_speed;
 938                         break;
 939                 }
 940         }
 941
 942         if (!found_speed) {
 943                 printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
 944          rate / 1000000);
 945                 return -EINVAL;
 946         }
 947
 948         curr_prcm_set = prcm;
 949         cur_rate = omap2_get_dpll_rate(&dpll_ck);
 950
 951         if (prcm->dpll_speed == cur_rate / 2) {
 952                 omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
 953         } else if (prcm->dpll_speed == cur_rate * 2) {
 954                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 955         } else if (prcm->dpll_speed != cur_rate) {
 956                 local_irq_save(flags);
 957
 958                 if (prcm->dpll_speed == prcm->xtal_speed)
 959                         bypass = 1;
 960
 961                 if ((prcm->cm_clksel2_pll & 0x3) == 2)
 962                         done_rate = PRCM_FULL_SPEED;
 963                 else
 964                         done_rate = PRCM_HALF_SPEED;
 965
 966                 /* MPU divider */
 967                 CM_CLKSEL_MPU = prcm->cm_clksel_mpu;
 968
 969                 /* dsp + iva1 div(2420), iva2.1(2430) */
 970                 CM_CLKSEL_DSP = prcm->cm_clksel_dsp;
 971
 972                 CM_CLKSEL_GFX = prcm->cm_clksel_gfx;
 973
 974                 /* Major subsystem dividers */
 975                 CM_CLKSEL1_CORE = prcm->cm_clksel1_core;
 976                 if (cpu_is_omap2430())
 977                         CM_CLKSEL_MDM = prcm->cm_clksel_mdm;
 978
 979                 /* x2 to enter init_mem */
 980                 omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
 981
 982                 omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
 983                                bypass);
 984
 985                 omap2_init_memory_params(omap2_dll_force_needed());
 986                 omap2_reprogram_sdrc(done_rate, 0);
 987
 988                 local_irq_restore(flags);
 989         }
 990         omap2_clksel_recalc(&dpll_ck);
 991
 992         return 0;
 993 }
 994
 995 /*-------------------------------------------------------------------------
 996  * Omap2 clock reset and init functions
 997  *-------------------------------------------------------------------------*/
 998
 999 static struct clk_functions omap2_clk_functions = {
1000         .clk_enable             = omap2_clk_enable,
1001         .clk_disable            = omap2_clk_disable,
1002         .clk_use                = omap2_clk_use,
1003         .clk_unuse              = omap2_clk_unuse,
1004         .clk_round_rate         = omap2_clk_round_rate,
1005         .clk_set_rate           = omap2_clk_set_rate,
1006         .clk_set_parent         = omap2_clk_set_parent,
1007 };
1008
1009 static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
1010 {
1011         u32 div, aplls, sclk = 13000000;
1012
1013         aplls = CM_CLKSEL1_PLL;
1014         aplls &= ((1 << 23) | (1 << 24) | (1 << 25));
1015         aplls >>= 23;                   /* Isolate field, 0,2,3 */
1016
1017         if (aplls == 0)
1018                 sclk = 19200000;
1019         else if (aplls == 2)
1020                 sclk = 13000000;
1021         else if (aplls == 3)
1022                 sclk = 12000000;
1023
1024         div = PRCM_CLKSRC_CTRL;
1025         div &= ((1 << 7) | (1 << 6));
1026         div >>= sys->rate_offset;
1027
1028         osc->rate = sclk * div;
1029         sys->rate = sclk;
1030 }
1031
1032 #ifdef CONFIG_OMAP_RESET_CLOCKS
1033 static void __init omap2_disable_unused_clocks(void)
1034 {
1035         struct clk *ck;
1036         u32 regval32;
1037
1038         list_for_each_entry(ck, &clocks, node) {
1039                 if (ck->usecount > 0 || (ck->flags & ALWAYS_ENABLED) ||
1040                         ck->enable_reg == 0)
1041                         continue;
1042
1043                 regval32 = __raw_readl(ck->enable_reg);
1044                 if ((regval32 & (1 << ck->enable_bit)) == 0)
1045                         continue;
1046
1047                 printk(KERN_INFO "Disabling unused clock \"%s\"\n", ck->name);
1048                 omap2_clk_disable(ck);
1049         }
1050 }
1051 late_initcall(omap2_disable_unused_clocks);
1052 #endif
1053
1054 /*
1055  * Switch the MPU rate if specified on cmdline.
1056  * We cannot do this early until cmdline is parsed.
1057  */
1058 static int __init omap2_clk_arch_init(void)
1059 {
1060         if (!mpurate)
1061                 return -EINVAL;
1062
1063         if (omap2_select_table_rate(&virt_prcm_set, mpurate))
1064                 printk(KERN_ERR "Could not find matching MPU rate\n");
1065
1066         propagate_rate(&osc_ck);                /* update main root fast */
1067         propagate_rate(&func_32k_ck);           /* update main root slow */
1068
1069         printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
1070                "%ld.%01ld/%ld/%ld MHz\n",
1071                (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1072                (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1073
1074         return 0;
1075 }
1076 arch_initcall(omap2_clk_arch_init);
1077
1078 int __init omap2_clk_init(void)
1079 {
1080         struct prcm_config *prcm;
1081         struct clk ** clkp;
1082         u32 clkrate;
1083
1084         clk_init(&omap2_clk_functions);
1085         omap2_get_crystal_rate(&osc_ck, &sys_ck);
1086
1087         for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
1088              clkp++) {
1089
1090                 if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
1091                         clk_register(*clkp);
1092                         continue;
1093                 }
1094
1095                 if ((*clkp)->flags & CLOCK_IN_OMAP243X && cpu_is_omap2430()) {
1096                         clk_register(*clkp);
1097                         continue;
1098                 }
1099         }
1100
1101         /* Check the MPU rate set by bootloader */
1102         clkrate = omap2_get_dpll_rate(&dpll_ck);
1103         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
1104                 if (prcm->xtal_speed != sys_ck.rate)
1105                         continue;
1106                 if (prcm->dpll_speed <= clkrate)
1107                          break;
1108         }
1109         curr_prcm_set = prcm;
1110
1111         propagate_rate(&osc_ck);                /* update main root fast */
1112         propagate_rate(&func_32k_ck);           /* update main root slow */
1113
1114         printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
1115                "%ld.%01ld/%ld/%ld MHz\n",
1116                (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1117                (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1118
1119         /*
1120          * Only enable those clocks we will need, let the drivers
1121          * enable other clocks as necessary
1122          */
1123         clk_use(&sync_32k_ick);
1124         clk_use(&omapctrl_ick);
1125         if (cpu_is_omap2430())
1126                 clk_use(&sdrc_ick);
1127
1128         return 0;
1129 }