git.oblomov.eu Git - linux-2.6/blob - arch/arm/mach-omap1/clock.c

   1 /*
   2  *  linux/arch/arm/mach-omap1/clock.c
   3  *
   4  *  Copyright (C) 2004 - 2005 Nokia corporation
   5  *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
   6  *
   7  *  Modified to use omap shared clock framework by
   8  *  Tony Lindgren <tony@atomide.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/list.h>
  17 #include <linux/errno.h>
  18 #include <linux/err.h>
  19 #include <linux/clk.h>
  20
  21 #include <asm/io.h>
  22
  23 #include <asm/arch/usb.h>
  24 #include <asm/arch/clock.h>
  25 #include <asm/arch/sram.h>
  26
  27 #include "clock.h"
  28
  29 __u32 arm_idlect1_mask;
  30
  31 /*-------------------------------------------------------------------------
  32  * Omap1 specific clock functions
  33  *-------------------------------------------------------------------------*/
  34
  35 static void omap1_watchdog_recalc(struct clk * clk)
  36 {
  37         clk->rate = clk->parent->rate / 14;
  38 }
  39
  40 static void omap1_uart_recalc(struct clk * clk)
  41 {
  42         unsigned int val = omap_readl(clk->enable_reg);
  43         if (val & clk->enable_bit)
  44                 clk->rate = 48000000;
  45         else
  46                 clk->rate = 12000000;
  47 }
  48
  49 static int omap1_clk_enable_dsp_domain(struct clk *clk)
  50 {
  51         int retval;
  52
  53         retval = omap1_clk_enable(&api_ck.clk);
  54         if (!retval) {
  55                 retval = omap1_clk_enable_generic(clk);
  56                 omap1_clk_disable(&api_ck.clk);
  57         }
  58
  59         return retval;
  60 }
  61
  62 static void omap1_clk_disable_dsp_domain(struct clk *clk)
  63 {
  64         if (omap1_clk_enable(&api_ck.clk) == 0) {
  65                 omap1_clk_disable_generic(clk);
  66                 omap1_clk_disable(&api_ck.clk);
  67         }
  68 }
  69
  70 static int omap1_clk_enable_uart_functional(struct clk *clk)
  71 {
  72         int ret;
  73         struct uart_clk *uclk;
  74
  75         ret = omap1_clk_enable_generic(clk);
  76         if (ret == 0) {
  77                 /* Set smart idle acknowledgement mode */
  78                 uclk = (struct uart_clk *)clk;
  79                 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x10) | 8,
  80                             uclk->sysc_addr);
  81         }
  82
  83         return ret;
  84 }
  85
  86 static void omap1_clk_disable_uart_functional(struct clk *clk)
  87 {
  88         struct uart_clk *uclk;
  89
  90         /* Set force idle acknowledgement mode */
  91         uclk = (struct uart_clk *)clk;
  92         omap_writeb((omap_readb(uclk->sysc_addr) & ~0x18), uclk->sysc_addr);
  93
  94         omap1_clk_disable_generic(clk);
  95 }
  96
  97 static void omap1_clk_allow_idle(struct clk *clk)
  98 {
  99         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 100
 101         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 102                 return;
 103
 104         if (iclk->no_idle_count > 0 && !(--iclk->no_idle_count))
 105                 arm_idlect1_mask |= 1 << iclk->idlect_shift;
 106 }
 107
 108 static void omap1_clk_deny_idle(struct clk *clk)
 109 {
 110         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 111
 112         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 113                 return;
 114
 115         if (iclk->no_idle_count++ == 0)
 116                 arm_idlect1_mask &= ~(1 << iclk->idlect_shift);
 117 }
 118
 119 static __u16 verify_ckctl_value(__u16 newval)
 120 {
 121         /* This function checks for following limitations set
 122          * by the hardware (all conditions must be true):
 123          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 124          * ARM_CK >= TC_CK
 125          * DSP_CK >= TC_CK
 126          * DSPMMU_CK >= TC_CK
 127          *
 128          * In addition following rules are enforced:
 129          * LCD_CK <= TC_CK
 130          * ARMPER_CK <= TC_CK
 131          *
 132          * However, maximum frequencies are not checked for!
 133          */
 134         __u8 per_exp;
 135         __u8 lcd_exp;
 136         __u8 arm_exp;
 137         __u8 dsp_exp;
 138         __u8 tc_exp;
 139         __u8 dspmmu_exp;
 140
 141         per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
 142         lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
 143         arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
 144         dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
 145         tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
 146         dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
 147
 148         if (dspmmu_exp < dsp_exp)
 149                 dspmmu_exp = dsp_exp;
 150         if (dspmmu_exp > dsp_exp+1)
 151                 dspmmu_exp = dsp_exp+1;
 152         if (tc_exp < arm_exp)
 153                 tc_exp = arm_exp;
 154         if (tc_exp < dspmmu_exp)
 155                 tc_exp = dspmmu_exp;
 156         if (tc_exp > lcd_exp)
 157                 lcd_exp = tc_exp;
 158         if (tc_exp > per_exp)
 159                 per_exp = tc_exp;
 160
 161         newval &= 0xf000;
 162         newval |= per_exp << CKCTL_PERDIV_OFFSET;
 163         newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
 164         newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
 165         newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
 166         newval |= tc_exp << CKCTL_TCDIV_OFFSET;
 167         newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
 168
 169         return newval;
 170 }
 171
 172 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
 173 {
 174         /* Note: If target frequency is too low, this function will return 4,
 175          * which is invalid value. Caller must check for this value and act
 176          * accordingly.
 177          *
 178          * Note: This function does not check for following limitations set
 179          * by the hardware (all conditions must be true):
 180          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 181          * ARM_CK >= TC_CK
 182          * DSP_CK >= TC_CK
 183          * DSPMMU_CK >= TC_CK
 184          */
 185         unsigned long realrate;
 186         struct clk * parent;
 187         unsigned  dsor_exp;
 188
 189         if (unlikely(!(clk->flags & RATE_CKCTL)))
 190                 return -EINVAL;
 191
 192         parent = clk->parent;
 193         if (unlikely(parent == 0))
 194                 return -EIO;
 195
 196         realrate = parent->rate;
 197         for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
 198                 if (realrate <= rate)
 199                         break;
 200
 201                 realrate /= 2;
 202         }
 203
 204         return dsor_exp;
 205 }
 206
 207 static void omap1_ckctl_recalc(struct clk * clk)
 208 {
 209         int dsor;
 210
 211         /* Calculate divisor encoded as 2-bit exponent */
 212         dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
 213
 214         if (unlikely(clk->rate == clk->parent->rate / dsor))
 215                 return; /* No change, quick exit */
 216         clk->rate = clk->parent->rate / dsor;
 217
 218         if (unlikely(clk->flags & RATE_PROPAGATES))
 219                 propagate_rate(clk);
 220 }
 221
 222 static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
 223 {
 224         int dsor;
 225
 226         /* Calculate divisor encoded as 2-bit exponent
 227          *
 228          * The clock control bits are in DSP domain,
 229          * so api_ck is needed for access.
 230          * Note that DSP_CKCTL virt addr = phys addr, so
 231          * we must use __raw_readw() instead of omap_readw().
 232          */
 233         omap1_clk_enable(&api_ck.clk);
 234         dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
 235         omap1_clk_disable(&api_ck.clk);
 236
 237         if (unlikely(clk->rate == clk->parent->rate / dsor))
 238                 return; /* No change, quick exit */
 239         clk->rate = clk->parent->rate / dsor;
 240
 241         if (unlikely(clk->flags & RATE_PROPAGATES))
 242                 propagate_rate(clk);
 243 }
 244
 245 /* MPU virtual clock functions */
 246 static int omap1_select_table_rate(struct clk * clk, unsigned long rate)
 247 {
 248         /* Find the highest supported frequency <= rate and switch to it */
 249         struct mpu_rate * ptr;
 250
 251         if (clk != &virtual_ck_mpu)
 252                 return -EINVAL;
 253
 254         for (ptr = rate_table; ptr->rate; ptr++) {
 255                 if (ptr->xtal != ck_ref.rate)
 256                         continue;
 257
 258                 /* DPLL1 cannot be reprogrammed without risking system crash */
 259                 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
 260                         continue;
 261
 262                 /* Can check only after xtal frequency check */
 263                 if (ptr->rate <= rate)
 264                         break;
 265         }
 266
 267         if (!ptr->rate)
 268                 return -EINVAL;
 269
 270         /*
 271          * In most cases we should not need to reprogram DPLL.
 272          * Reprogramming the DPLL is tricky, it must be done from SRAM.
 273          */
 274         omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
 275
 276         ck_dpll1.rate = ptr->pll_rate;
 277         propagate_rate(&ck_dpll1);
 278         return 0;
 279 }
 280
 281 static int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate)
 282 {
 283         int  ret = -EINVAL;
 284         int  dsor_exp;
 285         __u16  regval;
 286
 287         if (clk->flags & RATE_CKCTL) {
 288                 dsor_exp = calc_dsor_exp(clk, rate);
 289                 if (dsor_exp > 3)
 290                         dsor_exp = -EINVAL;
 291                 if (dsor_exp < 0)
 292                         return dsor_exp;
 293
 294                 regval = __raw_readw(DSP_CKCTL);
 295                 regval &= ~(3 << clk->rate_offset);
 296                 regval |= dsor_exp << clk->rate_offset;
 297                 __raw_writew(regval, DSP_CKCTL);
 298                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 299                 ret = 0;
 300         }
 301
 302         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 303                 propagate_rate(clk);
 304
 305         return ret;
 306 }
 307
 308 static long omap1_round_to_table_rate(struct clk * clk, unsigned long rate)
 309 {
 310         /* Find the highest supported frequency <= rate */
 311         struct mpu_rate * ptr;
 312         long  highest_rate;
 313
 314         if (clk != &virtual_ck_mpu)
 315                 return -EINVAL;
 316
 317         highest_rate = -EINVAL;
 318
 319         for (ptr = rate_table; ptr->rate; ptr++) {
 320                 if (ptr->xtal != ck_ref.rate)
 321                         continue;
 322
 323                 highest_rate = ptr->rate;
 324
 325                 /* Can check only after xtal frequency check */
 326                 if (ptr->rate <= rate)
 327                         break;
 328         }
 329
 330         return highest_rate;
 331 }
 332
 333 static unsigned calc_ext_dsor(unsigned long rate)
 334 {
 335         unsigned dsor;
 336
 337         /* MCLK and BCLK divisor selection is not linear:
 338          * freq = 96MHz / dsor
 339          *
 340          * RATIO_SEL range: dsor <-> RATIO_SEL
 341          * 0..6: (RATIO_SEL+2) <-> (dsor-2)
 342          * 6..48:  (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
 343          * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
 344          * can not be used.
 345          */
 346         for (dsor = 2; dsor < 96; ++dsor) {
 347                 if ((dsor & 1) && dsor > 8)
 348                         continue;
 349                 if (rate >= 96000000 / dsor)
 350                         break;
 351         }
 352         return dsor;
 353 }
 354
 355 /* Only needed on 1510 */
 356 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate)
 357 {
 358         unsigned int val;
 359
 360         val = omap_readl(clk->enable_reg);
 361         if (rate == 12000000)
 362                 val &= ~(1 << clk->enable_bit);
 363         else if (rate == 48000000)
 364                 val |= (1 << clk->enable_bit);
 365         else
 366                 return -EINVAL;
 367         omap_writel(val, clk->enable_reg);
 368         clk->rate = rate;
 369
 370         return 0;
 371 }
 372
 373 /* External clock (MCLK & BCLK) functions */
 374 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate)
 375 {
 376         unsigned dsor;
 377         __u16 ratio_bits;
 378
 379         dsor = calc_ext_dsor(rate);
 380         clk->rate = 96000000 / dsor;
 381         if (dsor > 8)
 382                 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
 383         else
 384                 ratio_bits = (dsor - 2) << 2;
 385
 386         ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
 387         omap_writew(ratio_bits, clk->enable_reg);
 388
 389         return 0;
 390 }
 391
 392 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate)
 393 {
 394         return 96000000 / calc_ext_dsor(rate);
 395 }
 396
 397 static void omap1_init_ext_clk(struct clk * clk)
 398 {
 399         unsigned dsor;
 400         __u16 ratio_bits;
 401
 402         /* Determine current rate and ensure clock is based on 96MHz APLL */
 403         ratio_bits = omap_readw(clk->enable_reg) & ~1;
 404         omap_writew(ratio_bits, clk->enable_reg);
 405
 406         ratio_bits = (ratio_bits & 0xfc) >> 2;
 407         if (ratio_bits > 6)
 408                 dsor = (ratio_bits - 6) * 2 + 8;
 409         else
 410                 dsor = ratio_bits + 2;
 411
 412         clk-> rate = 96000000 / dsor;
 413 }
 414
 415 static int omap1_clk_enable(struct clk *clk)
 416 {
 417         int ret = 0;
 418         if (clk->usecount++ == 0) {
 419                 if (likely(clk->parent)) {
 420                         ret = omap1_clk_enable(clk->parent);
 421
 422                         if (unlikely(ret != 0)) {
 423                                 clk->usecount--;
 424                                 return ret;
 425                         }
 426
 427                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 428                                 if (!cpu_is_omap24xx())
 429                                         omap1_clk_deny_idle(clk->parent);
 430                 }
 431
 432                 ret = clk->enable(clk);
 433
 434                 if (unlikely(ret != 0) && clk->parent) {
 435                         omap1_clk_disable(clk->parent);
 436                         clk->usecount--;
 437                 }
 438         }
 439
 440         return ret;
 441 }
 442
 443 static void omap1_clk_disable(struct clk *clk)
 444 {
 445         if (clk->usecount > 0 && !(--clk->usecount)) {
 446                 clk->disable(clk);
 447                 if (likely(clk->parent)) {
 448                         omap1_clk_disable(clk->parent);
 449                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 450                                 if (!cpu_is_omap24xx())
 451                                         omap1_clk_allow_idle(clk->parent);
 452                 }
 453         }
 454 }
 455
 456 static int omap1_clk_enable_generic(struct clk *clk)
 457 {
 458         __u16 regval16;
 459         __u32 regval32;
 460
 461         if (clk->flags & ALWAYS_ENABLED)
 462                 return 0;
 463
 464         if (unlikely(clk->enable_reg == 0)) {
 465                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 466                        clk->name);
 467                 return 0;
 468         }
 469
 470         if (clk->flags & ENABLE_REG_32BIT) {
 471                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 472                         regval32 = __raw_readl(clk->enable_reg);
 473                         regval32 |= (1 << clk->enable_bit);
 474                         __raw_writel(regval32, clk->enable_reg);
 475                 } else {
 476                         regval32 = omap_readl(clk->enable_reg);
 477                         regval32 |= (1 << clk->enable_bit);
 478                         omap_writel(regval32, clk->enable_reg);
 479                 }
 480         } else {
 481                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 482                         regval16 = __raw_readw(clk->enable_reg);
 483                         regval16 |= (1 << clk->enable_bit);
 484                         __raw_writew(regval16, clk->enable_reg);
 485                 } else {
 486                         regval16 = omap_readw(clk->enable_reg);
 487                         regval16 |= (1 << clk->enable_bit);
 488                         omap_writew(regval16, clk->enable_reg);
 489                 }
 490         }
 491
 492         return 0;
 493 }
 494
 495 static void omap1_clk_disable_generic(struct clk *clk)
 496 {
 497         __u16 regval16;
 498         __u32 regval32;
 499
 500         if (clk->enable_reg == 0)
 501                 return;
 502
 503         if (clk->flags & ENABLE_REG_32BIT) {
 504                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 505                         regval32 = __raw_readl(clk->enable_reg);
 506                         regval32 &= ~(1 << clk->enable_bit);
 507                         __raw_writel(regval32, clk->enable_reg);
 508                 } else {
 509                         regval32 = omap_readl(clk->enable_reg);
 510                         regval32 &= ~(1 << clk->enable_bit);
 511                         omap_writel(regval32, clk->enable_reg);
 512                 }
 513         } else {
 514                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 515                         regval16 = __raw_readw(clk->enable_reg);
 516                         regval16 &= ~(1 << clk->enable_bit);
 517                         __raw_writew(regval16, clk->enable_reg);
 518                 } else {
 519                         regval16 = omap_readw(clk->enable_reg);
 520                         regval16 &= ~(1 << clk->enable_bit);
 521                         omap_writew(regval16, clk->enable_reg);
 522                 }
 523         }
 524 }
 525
 526 static long omap1_clk_round_rate(struct clk *clk, unsigned long rate)
 527 {
 528         int dsor_exp;
 529
 530         if (clk->flags & RATE_FIXED)
 531                 return clk->rate;
 532
 533         if (clk->flags & RATE_CKCTL) {
 534                 dsor_exp = calc_dsor_exp(clk, rate);
 535                 if (dsor_exp < 0)
 536                         return dsor_exp;
 537                 if (dsor_exp > 3)
 538                         dsor_exp = 3;
 539                 return clk->parent->rate / (1 << dsor_exp);
 540         }
 541
 542         if(clk->round_rate != 0)
 543                 return clk->round_rate(clk, rate);
 544
 545         return clk->rate;
 546 }
 547
 548 static int omap1_clk_set_rate(struct clk *clk, unsigned long rate)
 549 {
 550         int  ret = -EINVAL;
 551         int  dsor_exp;
 552         __u16  regval;
 553
 554         if (clk->set_rate)
 555                 ret = clk->set_rate(clk, rate);
 556         else if (clk->flags & RATE_CKCTL) {
 557                 dsor_exp = calc_dsor_exp(clk, rate);
 558                 if (dsor_exp > 3)
 559                         dsor_exp = -EINVAL;
 560                 if (dsor_exp < 0)
 561                         return dsor_exp;
 562
 563                 regval = omap_readw(ARM_CKCTL);
 564                 regval &= ~(3 << clk->rate_offset);
 565                 regval |= dsor_exp << clk->rate_offset;
 566                 regval = verify_ckctl_value(regval);
 567                 omap_writew(regval, ARM_CKCTL);
 568                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 569                 ret = 0;
 570         }
 571
 572         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 573                 propagate_rate(clk);
 574
 575         return ret;
 576 }
 577
 578 /*-------------------------------------------------------------------------
 579  * Omap1 clock reset and init functions
 580  *-------------------------------------------------------------------------*/
 581
 582 #ifdef CONFIG_OMAP_RESET_CLOCKS
 583 /*
 584  * Resets some clocks that may be left on from bootloader,
 585  * but leaves serial clocks on. See also omap_late_clk_reset().
 586  */
 587 static inline void omap1_early_clk_reset(void)
 588 {
 589         //omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
 590 }
 591
 592 static int __init omap1_late_clk_reset(void)
 593 {
 594         /* Turn off all unused clocks */
 595         struct clk *p;
 596         __u32 regval32;
 597
 598         /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
 599         regval32 = omap_readw(SOFT_REQ_REG) & (1 << 4);
 600         omap_writew(regval32, SOFT_REQ_REG);
 601         omap_writew(0, SOFT_REQ_REG2);
 602
 603         list_for_each_entry(p, &clocks, node) {
 604                 if (p->usecount > 0 || (p->flags & ALWAYS_ENABLED) ||
 605                         p->enable_reg == 0)
 606                         continue;
 607
 608                 /* Clocks in the DSP domain need api_ck. Just assume bootloader
 609                  * has not enabled any DSP clocks */
 610                 if ((u32)p->enable_reg == DSP_IDLECT2) {
 611                         printk(KERN_INFO "Skipping reset check for DSP domain "
 612                                "clock \"%s\"\n", p->name);
 613                         continue;
 614                 }
 615
 616                 /* Is the clock already disabled? */
 617                 if (p->flags & ENABLE_REG_32BIT) {
 618                         if (p->flags & VIRTUAL_IO_ADDRESS)
 619                                 regval32 = __raw_readl(p->enable_reg);
 620                         else
 621                                 regval32 = omap_readl(p->enable_reg);
 622                 } else {
 623                         if (p->flags & VIRTUAL_IO_ADDRESS)
 624                                 regval32 = __raw_readw(p->enable_reg);
 625                         else
 626                                 regval32 = omap_readw(p->enable_reg);
 627                 }
 628
 629                 if ((regval32 & (1 << p->enable_bit)) == 0)
 630                         continue;
 631
 632                 /* FIXME: This clock seems to be necessary but no-one
 633                  * has asked for its activation. */
 634                 if (p == &tc2_ck         // FIX: pm.c (SRAM), CCP, Camera
 635                     || p == &ck_dpll1out.clk // FIX: SoSSI, SSR
 636                     || p == &arm_gpio_ck // FIX: GPIO code for 1510
 637                     ) {
 638                         printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
 639                                p->name);
 640                         continue;
 641                 }
 642
 643                 printk(KERN_INFO "Disabling unused clock \"%s\"... ", p->name);
 644                 p->disable(p);
 645                 printk(" done\n");
 646         }
 647
 648         return 0;
 649 }
 650 late_initcall(omap1_late_clk_reset);
 651
 652 #else
 653 #define omap1_early_clk_reset() {}
 654 #endif
 655
 656 static struct clk_functions omap1_clk_functions = {
 657         .clk_enable             = omap1_clk_enable,
 658         .clk_disable            = omap1_clk_disable,
 659         .clk_round_rate         = omap1_clk_round_rate,
 660         .clk_set_rate           = omap1_clk_set_rate,
 661 };
 662
 663 int __init omap1_clk_init(void)
 664 {
 665         struct clk ** clkp;
 666         const struct omap_clock_config *info;
 667         int crystal_type = 0; /* Default 12 MHz */
 668
 669         omap1_early_clk_reset();
 670         clk_init(&omap1_clk_functions);
 671
 672         /* By default all idlect1 clocks are allowed to idle */
 673         arm_idlect1_mask = ~0;
 674
 675         for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
 676                 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
 677                         clk_register(*clkp);
 678                         continue;
 679                 }
 680
 681                 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
 682                         clk_register(*clkp);
 683                         continue;
 684                 }
 685
 686                 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
 687                         clk_register(*clkp);
 688                         continue;
 689                 }
 690         }
 691
 692         info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
 693         if (info != NULL) {
 694                 if (!cpu_is_omap1510())
 695                         crystal_type = info->system_clock_type;
 696         }
 697
 698 #if defined(CONFIG_ARCH_OMAP730)
 699         ck_ref.rate = 13000000;
 700 #elif defined(CONFIG_ARCH_OMAP16XX)
 701         if (crystal_type == 2)
 702                 ck_ref.rate = 19200000;
 703 #endif
 704
 705         printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
 706                omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
 707                omap_readw(ARM_CKCTL));
 708
 709         /* We want to be in syncronous scalable mode */
 710         omap_writew(0x1000, ARM_SYSST);
 711
 712 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
 713         /* Use values set by bootloader. Determine PLL rate and recalculate
 714          * dependent clocks as if kernel had changed PLL or divisors.
 715          */
 716         {
 717                 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
 718
 719                 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
 720                 if (pll_ctl_val & 0x10) {
 721                         /* PLL enabled, apply multiplier and divisor */
 722                         if (pll_ctl_val & 0xf80)
 723                                 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
 724                         ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
 725                 } else {
 726                         /* PLL disabled, apply bypass divisor */
 727                         switch (pll_ctl_val & 0xc) {
 728                         case 0:
 729                                 break;
 730                         case 0x4:
 731                                 ck_dpll1.rate /= 2;
 732                                 break;
 733                         default:
 734                                 ck_dpll1.rate /= 4;
 735                                 break;
 736                         }
 737                 }
 738         }
 739         propagate_rate(&ck_dpll1);
 740 #else
 741         /* Find the highest supported frequency and enable it */
 742         if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
 743                 printk(KERN_ERR "System frequencies not set. Check your config.\n");
 744                 /* Guess sane values (60MHz) */
 745                 omap_writew(0x2290, DPLL_CTL);
 746                 omap_writew(0x1005, ARM_CKCTL);
 747                 ck_dpll1.rate = 60000000;
 748                 propagate_rate(&ck_dpll1);
 749         }
 750 #endif
 751         /* Cache rates for clocks connected to ck_ref (not dpll1) */
 752         propagate_rate(&ck_ref);
 753         printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
 754                 "%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
 755                ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
 756                ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
 757                arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
 758
 759 #ifdef CONFIG_MACH_OMAP_PERSEUS2
 760         /* Select slicer output as OMAP input clock */
 761         omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
 762 #endif
 763
 764         /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
 765         omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
 766
 767         /* Put DSP/MPUI into reset until needed */
 768         omap_writew(0, ARM_RSTCT1);
 769         omap_writew(1, ARM_RSTCT2);
 770         omap_writew(0x400, ARM_IDLECT1);
 771
 772         /*
 773          * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
 774          * of the ARM_IDLECT2 register must be set to zero. The power-on
 775          * default value of this bit is one.
 776          */
 777         omap_writew(0x0000, ARM_IDLECT2);       /* Turn LCD clock off also */
 778
 779         /*
 780          * Only enable those clocks we will need, let the drivers
 781          * enable other clocks as necessary
 782          */
 783         clk_enable(&armper_ck.clk);
 784         clk_enable(&armxor_ck.clk);
 785         clk_enable(&armtim_ck.clk); /* This should be done by timer code */
 786
 787         if (cpu_is_omap1510())
 788                 clk_enable(&arm_gpio_ck);
 789
 790         return 0;
 791 }
 792