arch/arm/mach-omap/clocks.c

   1 /*
   2  * Clock interface for OMAP
   3  *
   4  * Copyright (C) 2001 RidgeRun, Inc
   5  * Written by Gordon McNutt <gmcnutt@ridgerun.com>
   6  * Updated 2004 for Linux 2.6 by Tony Lindgren <tony@atomide.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2 of the License, or (at your
  11  * option) any later version.
  12  *
  13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  14  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  16  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  19  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  *
  24  * You should have received a copy of the GNU General Public License along
  25  * with this program; if not, write to the Free Software Foundation, Inc.,
  26  * 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/types.h>
  33 #include <linux/spinlock.h>
  34 #include <asm/errno.h>
  35 #include <asm/io.h>
  36 #include <asm/arch/clocks.h>
  37 #include <asm/arch/board.h>
  38
  39 extern void start_mputimer1(unsigned long load_val);
  40
  41 /* Input clock in MHz */
  42 static unsigned int source_clock = 12;
  43
  44 /*
  45  * We use one spinlock for all clock registers for now. We may want to
  46  * change this to be clock register specific later on. Before we can do
  47  * that, we need to map out the shared clock registers.
  48  */
  49 static spinlock_t clock_lock = SPIN_LOCK_UNLOCKED;
  50
  51 typedef struct {
  52         char            *name;
  53         __u8            flags;
  54         ck_t            parent;
  55         unsigned long   rate_reg;       /* Clock rate register */
  56         unsigned long   enbl_reg;       /* Enable register */
  57         unsigned long   idle_reg;       /* Idle register */
  58         unsigned long   slct_reg;       /* Select register */
  59         __s8            rate_shift;     /* Clock rate bit shift */
  60         __s8            enbl_shift;     /* Clock enable bit shift */
  61         __s8            idle_shift;     /* Clock idle bit shift */
  62         __s8            slct_shift;     /* Clock select bit shift */
  63 } ck_info_t;
  64
  65 #define CK_NAME(ck)             ck_info_table[ck].name
  66 #define CK_FLAGS(ck)            ck_info_table[ck].flags
  67 #define CK_PARENT(ck)           ck_info_table[ck].parent
  68 #define CK_RATE_REG(ck)         ck_info_table[ck].rate_reg
  69 #define CK_ENABLE_REG(ck)       ck_info_table[ck].enbl_reg
  70 #define CK_IDLE_REG(ck)         ck_info_table[ck].idle_reg
  71 #define CK_SELECT_REG(ck)       ck_info_table[ck].slct_reg
  72 #define CK_RATE_SHIFT(ck)       ck_info_table[ck].rate_shift
  73 #define CK_ENABLE_SHIFT(ck)     ck_info_table[ck].enbl_shift
  74 #define CK_IDLE_SHIFT(ck)       ck_info_table[ck].idle_shift
  75 #define CK_SELECT_SHIFT(ck)     ck_info_table[ck].slct_shift
  76 #define CK_CAN_CHANGE_RATE(cl)  (CK_FLAGS(ck) & CK_RATEF)
  77 #define CK_CAN_DISABLE(cl)      (CK_FLAGS(ck) & CK_ENABLEF)
  78 #define CK_CAN_IDLE(cl)         (CK_FLAGS(ck) & CK_IDLEF)
  79 #define CK_CAN_SWITCH(cl)       (CK_FLAGS(ck) & CK_SELECTF)
  80
  81 static ck_info_t ck_info_table[] = {
  82         {
  83                 .name           = "clkin",
  84                 .flags          = 0,
  85                 .parent         = OMAP_CLKIN,
  86         }, {
  87                 .name           = "ck_gen1",
  88                 .flags          = CK_RATEF | CK_IDLEF,
  89                 .rate_reg       = DPLL_CTL,
  90                 .idle_reg       = ARM_IDLECT1,
  91                 .idle_shift     = IDLDPLL_ARM,
  92                 .parent         = OMAP_CLKIN,
  93         }, {
  94                 .name           = "ck_gen2",
  95                 .flags          = 0,
  96                 .parent         = OMAP_CK_GEN1,
  97         }, {
  98                 .name           = "ck_gen3",
  99                 .flags          = 0,
 100                 .parent         = OMAP_CK_GEN1,
 101         }, {
 102                 .name           = "tc_ck",
 103                 .flags          = CK_RATEF | CK_IDLEF,
 104                 .parent         = OMAP_CK_GEN3,
 105                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[TCDIV(9:8)] */
 106                 .idle_reg       = ARM_IDLECT1,
 107                 .rate_shift     = TCDIV,
 108                 .idle_shift     = IDLIF_ARM
 109         }, {
 110                 .name           = "arm_ck",
 111                 .flags          = CK_IDLEF | CK_RATEF,
 112                 .parent         = OMAP_CK_GEN1,
 113                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[ARMDIV(5:4)] */
 114                 .idle_reg       = ARM_IDLECT1,
 115                 .rate_shift     = ARMDIV,
 116                 .idle_shift     = SETARM_IDLE,
 117         }, {
 118                 .name           = "mpuper_ck",
 119                 .flags          = CK_RATEF | CK_IDLEF | CK_ENABLEF,
 120                 .parent         = OMAP_CK_GEN1,
 121                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[PERDIV(1:0)] */
 122                 .enbl_reg       = ARM_IDLECT2,
 123                 .idle_reg       = ARM_IDLECT1,
 124                 .rate_shift     = PERDIV,
 125                 .enbl_shift     = EN_PERCK,
 126                 .idle_shift     = IDLPER_ARM
 127         }, {
 128                 .name           = "arm_gpio_ck",
 129                 .flags          = CK_ENABLEF,
 130                 .parent         = OMAP_CK_GEN1,
 131                 .enbl_reg       = ARM_IDLECT2,
 132                 .enbl_shift     = EN_GPIOCK
 133         }, {
 134                 .name           = "mpuxor_ck",
 135                 .flags          = CK_ENABLEF | CK_IDLEF,
 136                 .parent         = OMAP_CLKIN,
 137                 .idle_reg       = ARM_IDLECT1,
 138                 .enbl_reg       = ARM_IDLECT2,
 139                 .idle_shift     = IDLXORP_ARM,
 140                 .enbl_shift     = EN_XORPCK
 141         }, {
 142                 .name           = "mputim_ck",
 143                 .flags          = CK_IDLEF | CK_ENABLEF | CK_SELECTF,
 144                 .parent         = OMAP_CLKIN,
 145                 .idle_reg       = ARM_IDLECT1,
 146                 .enbl_reg       = ARM_IDLECT2,
 147                 .slct_reg       = ARM_CKCTL,
 148                 .idle_shift     = IDLTIM_ARM,
 149                 .enbl_shift     = EN_TIMCK,
 150                 .slct_shift     = ARM_TIMXO
 151         }, {
 152                 .name           = "mpuwd_ck",
 153                 .flags          = CK_IDLEF | CK_ENABLEF,
 154                 .parent         = OMAP_CLKIN,
 155                 .idle_reg       = ARM_IDLECT1,
 156                 .enbl_reg       = ARM_IDLECT2,
 157                 .idle_shift     = IDLWDT_ARM,
 158                 .enbl_shift     = EN_WDTCK,
 159         }, {
 160                 .name           = "dsp_ck",
 161                 .flags          = CK_RATEF | CK_ENABLEF,
 162                 .parent         = OMAP_CK_GEN2,
 163                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[DSPDIV(7:6)] */
 164                 .enbl_reg       = ARM_CKCTL,
 165                 .rate_shift     = DSPDIV,
 166                 .enbl_shift     = EN_DSPCK,
 167         }, {
 168                 .name           = "dspmmu_ck",
 169                 .flags          = CK_RATEF | CK_ENABLEF,
 170                 .parent         = OMAP_CK_GEN2,
 171                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[DSPMMUDIV(11:10)] */
 172                 .enbl_reg       = ARM_CKCTL,
 173                 .rate_shift     = DSPMMUDIV,
 174                 .enbl_shift     = EN_DSPCK,
 175         }, {
 176                 .name           = "dma_ck",
 177                 .flags          = CK_RATEF | CK_IDLEF | CK_ENABLEF,
 178                 .parent         = OMAP_CK_GEN3,
 179                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[TCDIV(9:8)] */
 180                 .idle_reg       = ARM_IDLECT1,
 181                 .enbl_reg       = ARM_IDLECT2,
 182                 .rate_shift     = TCDIV,
 183                 .idle_shift     = IDLIF_ARM,
 184                 .enbl_shift     = DMACK_REQ
 185         }, {
 186                 .name           = "api_ck",
 187                 .flags          = CK_RATEF | CK_IDLEF | CK_ENABLEF,
 188                 .parent         = OMAP_CK_GEN3,
 189                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[TCDIV(9:8)] */
 190                 .idle_reg       = ARM_IDLECT1,
 191                 .enbl_reg       = ARM_IDLECT2,
 192                 .rate_shift     = TCDIV,
 193                 .idle_shift     = IDLAPI_ARM,
 194                 .enbl_shift     = EN_APICK,
 195         }, {
 196                 .name           = "hsab_ck",
 197                 .flags          = CK_RATEF | CK_IDLEF | CK_ENABLEF,
 198                 .parent         = OMAP_CK_GEN3,
 199                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[TCDIV(9:8)] */
 200                 .idle_reg       = ARM_IDLECT1,
 201                 .enbl_reg       = ARM_IDLECT2,
 202                 .rate_shift     = TCDIV,
 203                 .idle_shift     = IDLHSAB_ARM,
 204                 .enbl_shift     = EN_HSABCK,
 205         }, {
 206                 .name           = "lbfree_ck",
 207                 .flags          = CK_RATEF | CK_ENABLEF,
 208                 .parent         = OMAP_CK_GEN3,
 209                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[TCDIV(9:8)] */
 210                 .enbl_reg       = ARM_IDLECT2,
 211                 .rate_shift     = TCDIV,
 212                 .enbl_shift     = EN_LBFREECK,
 213         }, {
 214                 .name           = "lb_ck",
 215                 .flags          = CK_RATEF | CK_IDLEF | CK_ENABLEF,
 216                 .parent         = OMAP_CK_GEN3,
 217                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[TCDIV(9:8)] */
 218                 .idle_reg       = ARM_IDLECT1,
 219                 .enbl_reg       = ARM_IDLECT2,
 220                 .rate_shift     = TCDIV,
 221                 .idle_shift     = IDLLB_ARM,
 222                 .enbl_shift     = EN_LBCK,
 223         }, {
 224                 .name           = "lcd_ck",
 225                 .flags          = CK_RATEF | CK_IDLEF | CK_ENABLEF,
 226                 .parent         = OMAP_CK_GEN3,
 227                 .rate_reg       = ARM_CKCTL,    /* ARM_CKCTL[LCDDIV(3:2)] */
 228                 .idle_reg       = ARM_IDLECT1,
 229                 .enbl_reg       = ARM_IDLECT2,
 230                 .rate_shift     = LCDDIV,
 231                 .idle_shift     = IDLLCD_ARM,
 232                 .enbl_shift     = EN_LCDCK,
 233         },
 234 };
 235
 236 /*****************************************************************************/
 237
 238 #define CK_IN_RANGE(ck)         (!((ck < OMAP_CK_MIN) || (ck > OMAP_CK_MAX)))
 239
 240 int ck_auto_unclock = 1;
 241 int ck_debug = 0;
 242
 243 #define CK_MAX_PLL_FREQ         OMAP_CK_MAX_RATE
 244 static __u32 ck_valid_table[CK_MAX_PLL_FREQ / 32 + 1];
 245 static __u8 ck_lookup_table[CK_MAX_PLL_FREQ];
 246
 247 int
 248 ck_set_input(ck_t ck, ck_t input)
 249 {
 250         int ret = 0, shift;
 251         unsigned short reg;
 252         unsigned long flags;
 253
 254         if (!CK_IN_RANGE(ck) || !CK_CAN_SWITCH(ck)) {
 255                 ret = -EINVAL;
 256                 goto exit;
 257         }
 258
 259         reg = omap_readw(CK_SELECT_REG(ck));
 260         shift = CK_SELECT_SHIFT(ck);
 261
 262         spin_lock_irqsave(&clock_lock, flags);
 263         if (input == OMAP_CLKIN) {
 264                 reg &= ~(1 << shift);
 265                 omap_writew(reg, CK_SELECT_REG(ck));
 266                 goto exit;
 267         } else if (input == CK_PARENT(ck)) {
 268                 reg |= (1 << shift);
 269                 omap_writew(reg, CK_SELECT_REG(ck));
 270                 goto exit;
 271         }
 272
 273         ret = -EINVAL;
 274  exit:
 275         spin_unlock_irqrestore(&clock_lock, flags);
 276         return ret;
 277 }
 278
 279 int
 280 ck_get_input(ck_t ck, ck_t * input)
 281 {
 282         int ret = -EINVAL;
 283         unsigned long flags;
 284
 285         if (!CK_IN_RANGE(ck))
 286                 goto exit;
 287
 288         ret = 0;
 289
 290         spin_lock_irqsave(&clock_lock, flags);
 291         if (CK_CAN_SWITCH(ck)) {
 292                 int shift;
 293                 unsigned short reg;
 294
 295                 reg = omap_readw(CK_SELECT_REG(ck));
 296                 shift = CK_SELECT_SHIFT(ck);
 297                 if (reg & (1 << shift)) {
 298                         *input = CK_PARENT(ck);
 299                         goto exit;
 300                 }
 301         }
 302
 303         *input = OMAP_CLKIN;
 304
 305  exit:
 306         spin_unlock_irqrestore(&clock_lock, flags);
 307         return ret;
 308 }
 309
 310 static int
 311 __ck_set_pll_rate(ck_t ck, int rate)
 312 {
 313         unsigned short pll;
 314         unsigned long flags;
 315
 316         if ((rate < 0) || (rate > CK_MAX_PLL_FREQ))
 317                 return -EINVAL;
 318
 319         /* Scan downward for the closest matching frequency */
 320         while (rate && !test_bit(rate, (unsigned long *)&ck_valid_table))
 321                 rate--;
 322
 323         if (!rate) {
 324                 printk(KERN_ERR "%s: couldn't find a matching rate\n",
 325                         __FUNCTION__);
 326                 return -EINVAL;
 327         }
 328
 329         spin_lock_irqsave(&clock_lock, flags);
 330         pll = omap_readw(CK_RATE_REG(ck));
 331
 332         /* Clear the rate bits */
 333         pll &= ~(0x1f << 5);
 334
 335         /* Set the rate bits */
 336         pll |= (ck_lookup_table[rate - 1] << 5);
 337
 338         omap_writew(pll, CK_RATE_REG(ck));
 339
 340         spin_unlock_irqrestore(&clock_lock, flags);
 341
 342         return 0;
 343 }
 344
 345 static int
 346 __ck_set_clkm_rate(ck_t ck, int rate)
 347 {
 348         int shift, prate, div, ret;
 349         unsigned short reg;
 350         unsigned long flags;
 351
 352         spin_lock_irqsave(&clock_lock, flags);
 353
 354         /*
 355          * We can only set this clock's value to a fraction of its
 356          * parent's value. The interface says I'll round down when necessary.
 357          * So first let's get the parent's current rate.
 358          */
 359         prate = ck_get_rate(CK_PARENT(ck));
 360
 361         /*
 362          * Let's just start with the highest fraction and keep searching
 363          * down through available rates until we find one less than or equal
 364          * to the desired rate.
 365          */
 366         for (div = 0; div < 4; div++) {
 367                 if (prate <= rate)
 368                         break;
 369                 prate = prate / 2;
 370         }
 371
 372         /*
 373          * Oops. Looks like the caller wants a rate lower than we can support.
 374          */
 375         if (div == 5) {
 376                 printk(KERN_ERR "%s: %d is too low\n",
 377                         __FUNCTION__, rate);
 378                 ret = -EINVAL;
 379                 goto exit;
 380         }
 381
 382         /*
 383          * One more detail: if this clock supports more than one parent, then
 384          * we're going to automatically switch over to the parent which runs
 385          * through the divisor. For omap this is not ambiguous because for all
 386          * such clocks one choice is always OMAP_CLKIN (which doesn't run
 387          * through the divisor) and the other is whatever I encoded as
 388          * CK_PARENT. Note that I wait until we get this far because I don't
 389          * want to switch the input until we're sure this is going to work.
 390          */
 391         if (CK_CAN_SWITCH(ck))
 392                 if ((ret = ck_set_input(ck, CK_PARENT(ck))) < 0) {
 393                         BUG();
 394                         goto exit;
 395                 }
 396
 397         /*
 398          * At last, we can set the divisor. Clear the old rate bits and
 399          * set the new ones.
 400          */
 401         reg = omap_readw(CK_RATE_REG(ck));
 402         shift = CK_RATE_SHIFT(ck);
 403         reg &= ~(3 << shift);
 404         reg |= (div << shift);
 405         omap_writew(reg, CK_RATE_REG(ck));
 406
 407         /* And return the new (actual, after rounding down) rate. */
 408         ret = prate;
 409
 410  exit:
 411         spin_unlock_irqrestore(&clock_lock, flags);
 412         return ret;
 413 }
 414
 415 int
 416 ck_set_rate(ck_t ck, int rate)
 417 {
 418         int ret = -EINVAL;
 419
 420         if (!CK_IN_RANGE(ck) || !CK_CAN_CHANGE_RATE(ck))
 421                 goto exit;
 422
 423         switch (ck) {
 424
 425         default:
 426                 ret = __ck_set_clkm_rate(ck, rate);
 427                 break;
 428
 429         case OMAP_CK_GEN1:
 430                 ret = __ck_set_pll_rate(ck, rate);
 431                 break;
 432
 433         };
 434
 435  exit:
 436         return ret;
 437 }
 438
 439 static int
 440 __ck_get_pll_rate(ck_t ck)
 441 {
 442         int m, d;
 443
 444         unsigned short pll = omap_readw(CK_RATE_REG(ck));
 445
 446         m = (pll & (0x1f << 7)) >> 7;
 447         m = m ? m : 1;
 448         d = (pll & (3 << 5)) >> 5;
 449         d++;
 450
 451         return ((source_clock * m) / d);
 452 }
 453
 454 static int
 455 __ck_get_clkm_rate(ck_t ck)
 456 {
 457         static int bits2div[] = { 1, 2, 4, 8 };
 458         int in, bits, reg, shift;
 459
 460         reg = omap_readw(CK_RATE_REG(ck));
 461         shift = CK_RATE_SHIFT(ck);
 462
 463         in = ck_get_rate(CK_PARENT(ck));
 464         bits = (reg & (3 << shift)) >> shift;
 465
 466         return (in / bits2div[bits]);
 467 }
 468
 469 int
 470 ck_get_rate(ck_t ck)
 471 {
 472         int ret = 0;
 473         ck_t parent;
 474
 475         if (!CK_IN_RANGE(ck)) {
 476                 ret = -EINVAL;
 477                 goto exit;
 478         }
 479
 480         switch (ck) {
 481
 482         case OMAP_CK_GEN1:
 483                 ret = __ck_get_pll_rate(ck);
 484                 break;
 485
 486         case OMAP_CLKIN:
 487                 ret = source_clock;
 488                 break;
 489
 490         case OMAP_MPUXOR_CK:
 491         case OMAP_CK_GEN2:
 492         case OMAP_CK_GEN3:
 493         case OMAP_ARM_GPIO_CK:
 494                 ret = ck_get_rate(CK_PARENT(ck));
 495                 break;
 496
 497         case OMAP_ARM_CK:
 498         case OMAP_MPUPER_CK:
 499         case OMAP_DSP_CK:
 500         case OMAP_DSPMMU_CK:
 501         case OMAP_LCD_CK:
 502         case OMAP_TC_CK:
 503         case OMAP_DMA_CK:
 504         case OMAP_API_CK:
 505         case OMAP_HSAB_CK:
 506         case OMAP_LBFREE_CK:
 507         case OMAP_LB_CK:
 508                 ret = __ck_get_clkm_rate(ck);
 509                 break;
 510
 511         case OMAP_MPUTIM_CK:
 512                 ck_get_input(ck, &parent);
 513                 ret = ck_get_rate(parent);
 514                 break;
 515
 516         case OMAP_MPUWD_CK:
 517                 /* Note that this evaluates to zero if source_clock is 12MHz. */
 518                 ret = source_clock / 14;
 519                 break;
 520         default:
 521                 ret = -EINVAL;
 522                 break;
 523         }
 524
 525  exit:
 526         return ret;
 527 }
 528
 529 int
 530 ck_enable(ck_t ck)
 531 {
 532         unsigned short reg;
 533         int ret = -EINVAL, shift;
 534         unsigned long flags;
 535
 536         if (!CK_IN_RANGE(ck))
 537                 goto exit;
 538
 539         if (ck_debug)
 540                 printk(KERN_DEBUG "%s: %s\n", __FUNCTION__, CK_NAME(ck));
 541
 542         ret = 0;
 543
 544         if (!CK_CAN_DISABLE(ck))
 545                 /* Then it must be on... */
 546                 goto exit;
 547
 548         spin_lock_irqsave(&clock_lock, flags);
 549         reg = omap_readw(CK_ENABLE_REG(ck));
 550         shift = CK_ENABLE_SHIFT(ck);
 551         reg |= (1 << shift);
 552         omap_writew(reg, CK_ENABLE_REG(ck));
 553         spin_unlock_irqrestore(&clock_lock, flags);
 554
 555  exit:
 556         return ret;
 557 }
 558
 559 int
 560 ck_disable(ck_t ck)
 561 {
 562         unsigned short reg;
 563         int ret = -EINVAL, shift;
 564         unsigned long flags;
 565
 566         if (!CK_IN_RANGE(ck))
 567                 goto exit;
 568
 569         if (ck_debug)
 570                 printk(KERN_DEBUG "%s: %s\n", __FUNCTION__, CK_NAME(ck));
 571
 572         if (!CK_CAN_DISABLE(ck))
 573                 goto exit;
 574
 575         ret = 0;
 576
 577         if (ck == OMAP_CLKIN)
 578                 return -EINVAL;
 579
 580         spin_lock_irqsave(&clock_lock, flags);
 581         reg = omap_readw(CK_ENABLE_REG(ck));
 582         shift = CK_ENABLE_SHIFT(ck);
 583         reg &= ~(1 << shift);
 584         omap_writew(reg, CK_ENABLE_REG(ck));
 585         spin_unlock_irqrestore(&clock_lock, flags);
 586
 587  exit:
 588         return ret;
 589 }
 590
 591 int ck_valid_rate(int rate)
 592 {
 593         return test_bit(rate, (unsigned long *)&ck_valid_table);
 594 }
 595
 596 static void
 597 __ck_make_lookup_table(void)
 598 {
 599         __u8 m, d;
 600
 601         memset(ck_valid_table, 0, sizeof (ck_valid_table));
 602
 603         for (m = 1; m < 32; m++)
 604                 for (d = 1; d < 5; d++) {
 605
 606                         int rate = ((source_clock * m) / (d));
 607
 608                         if (rate > CK_MAX_PLL_FREQ)
 609                                 continue;
 610                         if (test_bit(rate, (unsigned long *)&ck_valid_table))
 611                                 continue;
 612                         set_bit(rate, (unsigned long *)&ck_valid_table);
 613                         ck_lookup_table[rate - 1] = (m << 2) | (d - 1);
 614                 }
 615 }
 616
 617 int __init
 618 init_ck(void)
 619 {
 620         const struct omap_clock_config *info;
 621         int crystal_type = 0; /* Default 12 MHz */
 622
 623         __ck_make_lookup_table();
 624         info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
 625         if (info != NULL) {
 626                 if (!cpu_is_omap1510())
 627                         crystal_type = info->system_clock_type;
 628         }
 629
 630         /* We want to be in syncronous scalable mode */
 631         omap_writew(0x1000, ARM_SYSST);
 632 #if defined(CONFIG_OMAP_ARM_30MHZ)
 633         omap_writew(0x1555, ARM_CKCTL);
 634         omap_writew(0x2290, DPLL_CTL);
 635 #elif defined(CONFIG_OMAP_ARM_60MHZ)
 636         omap_writew(0x1005, ARM_CKCTL);
 637         omap_writew(0x2290, DPLL_CTL);
 638 #elif defined(CONFIG_OMAP_ARM_96MHZ)
 639         omap_writew(0x1005, ARM_CKCTL);
 640         omap_writew(0x2410, DPLL_CTL);
 641 #elif defined(CONFIG_OMAP_ARM_120MHZ)
 642         omap_writew(0x110a, ARM_CKCTL);
 643         omap_writew(0x2510, DPLL_CTL);
 644 #elif defined(CONFIG_OMAP_ARM_168MHZ)
 645         omap_writew(0x110f, ARM_CKCTL);
 646         omap_writew(0x2710, DPLL_CTL);
 647 #elif defined(CONFIG_OMAP_ARM_182MHZ) && defined(CONFIG_ARCH_OMAP730)
 648         omap_writew(0x250E, ARM_CKCTL);
 649         omap_writew(0x2710, DPLL_CTL);
 650 #elif defined(CONFIG_OMAP_ARM_192MHZ) && (defined(CONFIG_ARCH_OMAP1610) || defined(CONFIG_ARCH_OMAP5912) \
 651                                           || defined(CONFIG_ARCH_OMAP1710))
 652         omap_writew(0x150f, ARM_CKCTL);
 653         if (crystal_type == 2) {
 654                 source_clock = 13;      /* MHz */
 655                 omap_writew(0x2510, DPLL_CTL);
 656         } else
 657                 omap_writew(0x2810, DPLL_CTL);
 658 #elif defined(CONFIG_OMAP_ARM_195MHZ) && defined(CONFIG_ARCH_OMAP730)
 659         omap_writew(0x250E, ARM_CKCTL);
 660         omap_writew(0x2790, DPLL_CTL);
 661 #else
 662 #error "OMAP MHZ not set, please run make xconfig"
 663 #endif
 664
 665 #ifdef CONFIG_MACH_OMAP_PERSEUS2
 666         /* Select slicer output as OMAP input clock */
 667         omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
 668 #endif
 669
 670         /* Turn off some other junk the bootloader might have turned on */
 671
 672         /* Turn off DSP, ARM_INTHCK, ARM_TIMXO */
 673         omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
 674
 675         /* Put DSP/MPUI into reset until needed */
 676         omap_writew(0, ARM_RSTCT1);
 677         omap_writew(1, ARM_RSTCT2);
 678         omap_writew(0x400, ARM_IDLECT1);
 679
 680         /*
 681          * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
 682          * of the ARM_IDLECT2 register must be set to zero. The power-on
 683          * default value of this bit is one.
 684          */
 685         omap_writew(0x0000, ARM_IDLECT2);       /* Turn LCD clock off also */
 686
 687         /*
 688          * Only enable those clocks we will need, let the drivers
 689          * enable other clocks as necessary
 690          */
 691         ck_enable(OMAP_MPUPER_CK);
 692         ck_enable(OMAP_ARM_GPIO_CK);
 693         ck_enable(OMAP_MPUXOR_CK);
 694         //ck_set_rate(OMAP_MPUTIM_CK, OMAP_CLKIN);
 695         ck_enable(OMAP_MPUTIM_CK);
 696         start_mputimer1(0xffffffff);
 697
 698         return 0;
 699 }
 700
 701
 702 EXPORT_SYMBOL(ck_get_rate);
 703 EXPORT_SYMBOL(ck_set_rate);
 704 EXPORT_SYMBOL(ck_enable);
 705 EXPORT_SYMBOL(ck_disable);