arch/arm/mach-omap1/clock.c

   1 //kernel/linux-omap-fsample/arch/arm/mach-omap1/clock.c#2 - edit change 3808 (text)
   2 /*
   3  *  linux/arch/arm/mach-omap1/clock.c
   4  *
   5  *  Copyright (C) 2004 - 2005 Nokia corporation
   6  *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
   7  *
   8  *  Modified to use omap shared clock framework by
   9  *  Tony Lindgren <tony@atomide.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/list.h>
  18 #include <linux/errno.h>
  19 #include <linux/err.h>
  20 #include <linux/clk.h>
  21
  22 #include <asm/io.h>
  23 #include <asm/mach-types.h>
  24
  25 #include <asm/arch/cpu.h>
  26 #include <asm/arch/usb.h>
  27 #include <asm/arch/clock.h>
  28 #include <asm/arch/sram.h>
  29
  30 #include "clock.h"
  31
  32 __u32 arm_idlect1_mask;
  33
  34 /*-------------------------------------------------------------------------
  35  * Omap1 specific clock functions
  36  *-------------------------------------------------------------------------*/
  37
  38 static void omap1_watchdog_recalc(struct clk * clk)
  39 {
  40         clk->rate = clk->parent->rate / 14;
  41 }
  42
  43 static void omap1_uart_recalc(struct clk * clk)
  44 {
  45         unsigned int val = omap_readl(clk->enable_reg);
  46         if (val & clk->enable_bit)
  47                 clk->rate = 48000000;
  48         else
  49                 clk->rate = 12000000;
  50 }
  51
  52 static int omap1_clk_enable_dsp_domain(struct clk *clk)
  53 {
  54         int retval;
  55
  56         retval = omap1_clk_enable(&api_ck.clk);
  57         if (!retval) {
  58                 retval = omap1_clk_enable_generic(clk);
  59                 omap1_clk_disable(&api_ck.clk);
  60         }
  61
  62         return retval;
  63 }
  64
  65 static void omap1_clk_disable_dsp_domain(struct clk *clk)
  66 {
  67         if (omap1_clk_enable(&api_ck.clk) == 0) {
  68                 omap1_clk_disable_generic(clk);
  69                 omap1_clk_disable(&api_ck.clk);
  70         }
  71 }
  72
  73 static int omap1_clk_enable_uart_functional(struct clk *clk)
  74 {
  75         int ret;
  76         struct uart_clk *uclk;
  77
  78         ret = omap1_clk_enable_generic(clk);
  79         if (ret == 0) {
  80                 /* Set smart idle acknowledgement mode */
  81                 uclk = (struct uart_clk *)clk;
  82                 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x10) | 8,
  83                             uclk->sysc_addr);
  84         }
  85
  86         return ret;
  87 }
  88
  89 static void omap1_clk_disable_uart_functional(struct clk *clk)
  90 {
  91         struct uart_clk *uclk;
  92
  93         /* Set force idle acknowledgement mode */
  94         uclk = (struct uart_clk *)clk;
  95         omap_writeb((omap_readb(uclk->sysc_addr) & ~0x18), uclk->sysc_addr);
  96
  97         omap1_clk_disable_generic(clk);
  98 }
  99
 100 static void omap1_clk_allow_idle(struct clk *clk)
 101 {
 102         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 103
 104         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 105                 return;
 106
 107         if (iclk->no_idle_count > 0 && !(--iclk->no_idle_count))
 108                 arm_idlect1_mask |= 1 << iclk->idlect_shift;
 109 }
 110
 111 static void omap1_clk_deny_idle(struct clk *clk)
 112 {
 113         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 114
 115         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 116                 return;
 117
 118         if (iclk->no_idle_count++ == 0)
 119                 arm_idlect1_mask &= ~(1 << iclk->idlect_shift);
 120 }
 121
 122 static __u16 verify_ckctl_value(__u16 newval)
 123 {
 124         /* This function checks for following limitations set
 125          * by the hardware (all conditions must be true):
 126          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 127          * ARM_CK >= TC_CK
 128          * DSP_CK >= TC_CK
 129          * DSPMMU_CK >= TC_CK
 130          *
 131          * In addition following rules are enforced:
 132          * LCD_CK <= TC_CK
 133          * ARMPER_CK <= TC_CK
 134          *
 135          * However, maximum frequencies are not checked for!
 136          */
 137         __u8 per_exp;
 138         __u8 lcd_exp;
 139         __u8 arm_exp;
 140         __u8 dsp_exp;
 141         __u8 tc_exp;
 142         __u8 dspmmu_exp;
 143
 144         per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
 145         lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
 146         arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
 147         dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
 148         tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
 149         dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
 150
 151         if (dspmmu_exp < dsp_exp)
 152                 dspmmu_exp = dsp_exp;
 153         if (dspmmu_exp > dsp_exp+1)
 154                 dspmmu_exp = dsp_exp+1;
 155         if (tc_exp < arm_exp)
 156                 tc_exp = arm_exp;
 157         if (tc_exp < dspmmu_exp)
 158                 tc_exp = dspmmu_exp;
 159         if (tc_exp > lcd_exp)
 160                 lcd_exp = tc_exp;
 161         if (tc_exp > per_exp)
 162                 per_exp = tc_exp;
 163
 164         newval &= 0xf000;
 165         newval |= per_exp << CKCTL_PERDIV_OFFSET;
 166         newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
 167         newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
 168         newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
 169         newval |= tc_exp << CKCTL_TCDIV_OFFSET;
 170         newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
 171
 172         return newval;
 173 }
 174
 175 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
 176 {
 177         /* Note: If target frequency is too low, this function will return 4,
 178          * which is invalid value. Caller must check for this value and act
 179          * accordingly.
 180          *
 181          * Note: This function does not check for following limitations set
 182          * by the hardware (all conditions must be true):
 183          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 184          * ARM_CK >= TC_CK
 185          * DSP_CK >= TC_CK
 186          * DSPMMU_CK >= TC_CK
 187          */
 188         unsigned long realrate;
 189         struct clk * parent;
 190         unsigned  dsor_exp;
 191
 192         if (unlikely(!(clk->flags & RATE_CKCTL)))
 193                 return -EINVAL;
 194
 195         parent = clk->parent;
 196         if (unlikely(parent == 0))
 197                 return -EIO;
 198
 199         realrate = parent->rate;
 200         for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
 201                 if (realrate <= rate)
 202                         break;
 203
 204                 realrate /= 2;
 205         }
 206
 207         return dsor_exp;
 208 }
 209
 210 static void omap1_ckctl_recalc(struct clk * clk)
 211 {
 212         int dsor;
 213
 214         /* Calculate divisor encoded as 2-bit exponent */
 215         dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
 216
 217         if (unlikely(clk->rate == clk->parent->rate / dsor))
 218                 return; /* No change, quick exit */
 219         clk->rate = clk->parent->rate / dsor;
 220
 221         if (unlikely(clk->flags & RATE_PROPAGATES))
 222                 propagate_rate(clk);
 223 }
 224
 225 static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
 226 {
 227         int dsor;
 228
 229         /* Calculate divisor encoded as 2-bit exponent
 230          *
 231          * The clock control bits are in DSP domain,
 232          * so api_ck is needed for access.
 233          * Note that DSP_CKCTL virt addr = phys addr, so
 234          * we must use __raw_readw() instead of omap_readw().
 235          */
 236         omap1_clk_enable(&api_ck.clk);
 237         dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
 238         omap1_clk_disable(&api_ck.clk);
 239
 240         if (unlikely(clk->rate == clk->parent->rate / dsor))
 241                 return; /* No change, quick exit */
 242         clk->rate = clk->parent->rate / dsor;
 243
 244         if (unlikely(clk->flags & RATE_PROPAGATES))
 245                 propagate_rate(clk);
 246 }
 247
 248 /* MPU virtual clock functions */
 249 static int omap1_select_table_rate(struct clk * clk, unsigned long rate)
 250 {
 251         /* Find the highest supported frequency <= rate and switch to it */
 252         struct mpu_rate * ptr;
 253
 254         if (clk != &virtual_ck_mpu)
 255                 return -EINVAL;
 256
 257         for (ptr = rate_table; ptr->rate; ptr++) {
 258                 if (ptr->xtal != ck_ref.rate)
 259                         continue;
 260
 261                 /* DPLL1 cannot be reprogrammed without risking system crash */
 262                 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
 263                         continue;
 264
 265                 /* Can check only after xtal frequency check */
 266                 if (ptr->rate <= rate)
 267                         break;
 268         }
 269
 270         if (!ptr->rate)
 271                 return -EINVAL;
 272
 273         /*
 274          * In most cases we should not need to reprogram DPLL.
 275          * Reprogramming the DPLL is tricky, it must be done from SRAM.
 276          * (on 730, bit 13 must always be 1)
 277          */
 278         if (cpu_is_omap730())
 279                 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val | 0x2000);
 280         else
 281                 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
 282
 283         ck_dpll1.rate = ptr->pll_rate;
 284         propagate_rate(&ck_dpll1);
 285         return 0;
 286 }
 287
 288 static int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate)
 289 {
 290         int  ret = -EINVAL;
 291         int  dsor_exp;
 292         __u16  regval;
 293
 294         if (clk->flags & RATE_CKCTL) {
 295                 dsor_exp = calc_dsor_exp(clk, rate);
 296                 if (dsor_exp > 3)
 297                         dsor_exp = -EINVAL;
 298                 if (dsor_exp < 0)
 299                         return dsor_exp;
 300
 301                 regval = __raw_readw(DSP_CKCTL);
 302                 regval &= ~(3 << clk->rate_offset);
 303                 regval |= dsor_exp << clk->rate_offset;
 304                 __raw_writew(regval, DSP_CKCTL);
 305                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 306                 ret = 0;
 307         }
 308
 309         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 310                 propagate_rate(clk);
 311
 312         return ret;
 313 }
 314
 315 static long omap1_round_to_table_rate(struct clk * clk, unsigned long rate)
 316 {
 317         /* Find the highest supported frequency <= rate */
 318         struct mpu_rate * ptr;
 319         long  highest_rate;
 320
 321         if (clk != &virtual_ck_mpu)
 322                 return -EINVAL;
 323
 324         highest_rate = -EINVAL;
 325
 326         for (ptr = rate_table; ptr->rate; ptr++) {
 327                 if (ptr->xtal != ck_ref.rate)
 328                         continue;
 329
 330                 highest_rate = ptr->rate;
 331
 332                 /* Can check only after xtal frequency check */
 333                 if (ptr->rate <= rate)
 334                         break;
 335         }
 336
 337         return highest_rate;
 338 }
 339
 340 static unsigned calc_ext_dsor(unsigned long rate)
 341 {
 342         unsigned dsor;
 343
 344         /* MCLK and BCLK divisor selection is not linear:
 345          * freq = 96MHz / dsor
 346          *
 347          * RATIO_SEL range: dsor <-> RATIO_SEL
 348          * 0..6: (RATIO_SEL+2) <-> (dsor-2)
 349          * 6..48:  (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
 350          * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
 351          * can not be used.
 352          */
 353         for (dsor = 2; dsor < 96; ++dsor) {
 354                 if ((dsor & 1) && dsor > 8)
 355                         continue;
 356                 if (rate >= 96000000 / dsor)
 357                         break;
 358         }
 359         return dsor;
 360 }
 361
 362 /* Only needed on 1510 */
 363 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate)
 364 {
 365         unsigned int val;
 366
 367         val = omap_readl(clk->enable_reg);
 368         if (rate == 12000000)
 369                 val &= ~(1 << clk->enable_bit);
 370         else if (rate == 48000000)
 371                 val |= (1 << clk->enable_bit);
 372         else
 373                 return -EINVAL;
 374         omap_writel(val, clk->enable_reg);
 375         clk->rate = rate;
 376
 377         return 0;
 378 }
 379
 380 /* External clock (MCLK & BCLK) functions */
 381 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate)
 382 {
 383         unsigned dsor;
 384         __u16 ratio_bits;
 385
 386         dsor = calc_ext_dsor(rate);
 387         clk->rate = 96000000 / dsor;
 388         if (dsor > 8)
 389                 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
 390         else
 391                 ratio_bits = (dsor - 2) << 2;
 392
 393         ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
 394         omap_writew(ratio_bits, clk->enable_reg);
 395
 396         return 0;
 397 }
 398
 399 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate)
 400 {
 401         return 96000000 / calc_ext_dsor(rate);
 402 }
 403
 404 static void omap1_init_ext_clk(struct clk * clk)
 405 {
 406         unsigned dsor;
 407         __u16 ratio_bits;
 408
 409         /* Determine current rate and ensure clock is based on 96MHz APLL */
 410         ratio_bits = omap_readw(clk->enable_reg) & ~1;
 411         omap_writew(ratio_bits, clk->enable_reg);
 412
 413         ratio_bits = (ratio_bits & 0xfc) >> 2;
 414         if (ratio_bits > 6)
 415                 dsor = (ratio_bits - 6) * 2 + 8;
 416         else
 417                 dsor = ratio_bits + 2;
 418
 419         clk-> rate = 96000000 / dsor;
 420 }
 421
 422 static int omap1_clk_enable(struct clk *clk)
 423 {
 424         int ret = 0;
 425         if (clk->usecount++ == 0) {
 426                 if (likely(clk->parent)) {
 427                         ret = omap1_clk_enable(clk->parent);
 428
 429                         if (unlikely(ret != 0)) {
 430                                 clk->usecount--;
 431                                 return ret;
 432                         }
 433
 434                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 435                                 if (!cpu_is_omap24xx())
 436                                         omap1_clk_deny_idle(clk->parent);
 437                 }
 438
 439                 ret = clk->enable(clk);
 440
 441                 if (unlikely(ret != 0) && clk->parent) {
 442                         omap1_clk_disable(clk->parent);
 443                         clk->usecount--;
 444                 }
 445         }
 446
 447         return ret;
 448 }
 449
 450 static void omap1_clk_disable(struct clk *clk)
 451 {
 452         if (clk->usecount > 0 && !(--clk->usecount)) {
 453                 clk->disable(clk);
 454                 if (likely(clk->parent)) {
 455                         omap1_clk_disable(clk->parent);
 456                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 457                                 if (!cpu_is_omap24xx())
 458                                         omap1_clk_allow_idle(clk->parent);
 459                 }
 460         }
 461 }
 462
 463 static int omap1_clk_enable_generic(struct clk *clk)
 464 {
 465         __u16 regval16;
 466         __u32 regval32;
 467
 468         if (clk->flags & ALWAYS_ENABLED)
 469                 return 0;
 470
 471         if (unlikely(clk->enable_reg == 0)) {
 472                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 473                        clk->name);
 474                 return 0;
 475         }
 476
 477         if (clk->flags & ENABLE_REG_32BIT) {
 478                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 479                         regval32 = __raw_readl(clk->enable_reg);
 480                         regval32 |= (1 << clk->enable_bit);
 481                         __raw_writel(regval32, clk->enable_reg);
 482                 } else {
 483                         regval32 = omap_readl(clk->enable_reg);
 484                         regval32 |= (1 << clk->enable_bit);
 485                         omap_writel(regval32, clk->enable_reg);
 486                 }
 487         } else {
 488                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 489                         regval16 = __raw_readw(clk->enable_reg);
 490                         regval16 |= (1 << clk->enable_bit);
 491                         __raw_writew(regval16, clk->enable_reg);
 492                 } else {
 493                         regval16 = omap_readw(clk->enable_reg);
 494                         regval16 |= (1 << clk->enable_bit);
 495                         omap_writew(regval16, clk->enable_reg);
 496                 }
 497         }
 498
 499         return 0;
 500 }
 501
 502 static void omap1_clk_disable_generic(struct clk *clk)
 503 {
 504         __u16 regval16;
 505         __u32 regval32;
 506
 507         if (clk->enable_reg == 0)
 508                 return;
 509
 510         if (clk->flags & ENABLE_REG_32BIT) {
 511                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 512                         regval32 = __raw_readl(clk->enable_reg);
 513                         regval32 &= ~(1 << clk->enable_bit);
 514                         __raw_writel(regval32, clk->enable_reg);
 515                 } else {
 516                         regval32 = omap_readl(clk->enable_reg);
 517                         regval32 &= ~(1 << clk->enable_bit);
 518                         omap_writel(regval32, clk->enable_reg);
 519                 }
 520         } else {
 521                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 522                         regval16 = __raw_readw(clk->enable_reg);
 523                         regval16 &= ~(1 << clk->enable_bit);
 524                         __raw_writew(regval16, clk->enable_reg);
 525                 } else {
 526                         regval16 = omap_readw(clk->enable_reg);
 527                         regval16 &= ~(1 << clk->enable_bit);
 528                         omap_writew(regval16, clk->enable_reg);
 529                 }
 530         }
 531 }
 532
 533 static long omap1_clk_round_rate(struct clk *clk, unsigned long rate)
 534 {
 535         int dsor_exp;
 536
 537         if (clk->flags & RATE_FIXED)
 538                 return clk->rate;
 539
 540         if (clk->flags & RATE_CKCTL) {
 541                 dsor_exp = calc_dsor_exp(clk, rate);
 542                 if (dsor_exp < 0)
 543                         return dsor_exp;
 544                 if (dsor_exp > 3)
 545                         dsor_exp = 3;
 546                 return clk->parent->rate / (1 << dsor_exp);
 547         }
 548
 549         if(clk->round_rate != 0)
 550                 return clk->round_rate(clk, rate);
 551
 552         return clk->rate;
 553 }
 554
 555 static int omap1_clk_set_rate(struct clk *clk, unsigned long rate)
 556 {
 557         int  ret = -EINVAL;
 558         int  dsor_exp;
 559         __u16  regval;
 560
 561         if (clk->set_rate)
 562                 ret = clk->set_rate(clk, rate);
 563         else if (clk->flags & RATE_CKCTL) {
 564                 dsor_exp = calc_dsor_exp(clk, rate);
 565                 if (dsor_exp > 3)
 566                         dsor_exp = -EINVAL;
 567                 if (dsor_exp < 0)
 568                         return dsor_exp;
 569
 570                 regval = omap_readw(ARM_CKCTL);
 571                 regval &= ~(3 << clk->rate_offset);
 572                 regval |= dsor_exp << clk->rate_offset;
 573                 regval = verify_ckctl_value(regval);
 574                 omap_writew(regval, ARM_CKCTL);
 575                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 576                 ret = 0;
 577         }
 578
 579         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 580                 propagate_rate(clk);
 581
 582         return ret;
 583 }
 584
 585 /*-------------------------------------------------------------------------
 586  * Omap1 clock reset and init functions
 587  *-------------------------------------------------------------------------*/
 588
 589 #ifdef CONFIG_OMAP_RESET_CLOCKS
 590
 591 static void __init omap1_clk_disable_unused(struct clk *clk)
 592 {
 593         __u32 regval32;
 594
 595         /* Clocks in the DSP domain need api_ck. Just assume bootloader
 596          * has not enabled any DSP clocks */
 597         if ((u32)clk->enable_reg == DSP_IDLECT2) {
 598                 printk(KERN_INFO "Skipping reset check for DSP domain "
 599                        "clock \"%s\"\n", clk->name);
 600                 return;
 601         }
 602
 603         /* Is the clock already disabled? */
 604         if (clk->flags & ENABLE_REG_32BIT) {
 605                 if (clk->flags & VIRTUAL_IO_ADDRESS)
 606                         regval32 = __raw_readl(clk->enable_reg);
 607                         else
 608                                 regval32 = omap_readl(clk->enable_reg);
 609         } else {
 610                 if (clk->flags & VIRTUAL_IO_ADDRESS)
 611                         regval32 = __raw_readw(clk->enable_reg);
 612                 else
 613                         regval32 = omap_readw(clk->enable_reg);
 614         }
 615
 616         if ((regval32 & (1 << clk->enable_bit)) == 0)
 617                 return;
 618
 619         /* FIXME: This clock seems to be necessary but no-one
 620          * has asked for its activation. */
 621         if (clk == &tc2_ck              // FIX: pm.c (SRAM), CCP, Camera
 622             || clk == &ck_dpll1out.clk  // FIX: SoSSI, SSR
 623             || clk == &arm_gpio_ck      // FIX: GPIO code for 1510
 624                 ) {
 625                 printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
 626                        clk->name);
 627                 return;
 628         }
 629
 630         printk(KERN_INFO "Disabling unused clock \"%s\"... ", clk->name);
 631         clk->disable(clk);
 632         printk(" done\n");
 633 }
 634
 635 #else
 636 #define omap1_clk_disable_unused        NULL
 637 #endif
 638
 639 static struct clk_functions omap1_clk_functions = {
 640         .clk_enable             = omap1_clk_enable,
 641         .clk_disable            = omap1_clk_disable,
 642         .clk_round_rate         = omap1_clk_round_rate,
 643         .clk_set_rate           = omap1_clk_set_rate,
 644         .clk_disable_unused     = omap1_clk_disable_unused,
 645 };
 646
 647 int __init omap1_clk_init(void)
 648 {
 649         struct clk ** clkp;
 650         const struct omap_clock_config *info;
 651         int crystal_type = 0; /* Default 12 MHz */
 652         u32 reg;
 653
 654         /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
 655         reg = omap_readw(SOFT_REQ_REG) & (1 << 4);
 656         omap_writew(reg, SOFT_REQ_REG);
 657         omap_writew(0, SOFT_REQ_REG2);
 658
 659         clk_init(&omap1_clk_functions);
 660
 661         /* By default all idlect1 clocks are allowed to idle */
 662         arm_idlect1_mask = ~0;
 663
 664         for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
 665                 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
 666                         clk_register(*clkp);
 667                         continue;
 668                 }
 669
 670                 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
 671                         clk_register(*clkp);
 672                         continue;
 673                 }
 674
 675                 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
 676                         clk_register(*clkp);
 677                         continue;
 678                 }
 679
 680                 if (((*clkp)->flags &CLOCK_IN_OMAP310) && cpu_is_omap310()) {
 681                         clk_register(*clkp);
 682                         continue;
 683                 }
 684         }
 685
 686         info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
 687         if (info != NULL) {
 688                 if (!cpu_is_omap1510())
 689                         crystal_type = info->system_clock_type;
 690         }
 691
 692 #if defined(CONFIG_ARCH_OMAP730)
 693         ck_ref.rate = 13000000;
 694 #elif defined(CONFIG_ARCH_OMAP16XX)
 695         if (crystal_type == 2)
 696                 ck_ref.rate = 19200000;
 697 #endif
 698
 699         printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
 700                omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
 701                omap_readw(ARM_CKCTL));
 702
 703         /* We want to be in syncronous scalable mode */
 704         omap_writew(0x1000, ARM_SYSST);
 705
 706 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
 707         /* Use values set by bootloader. Determine PLL rate and recalculate
 708          * dependent clocks as if kernel had changed PLL or divisors.
 709          */
 710         {
 711                 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
 712
 713                 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
 714                 if (pll_ctl_val & 0x10) {
 715                         /* PLL enabled, apply multiplier and divisor */
 716                         if (pll_ctl_val & 0xf80)
 717                                 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
 718                         ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
 719                 } else {
 720                         /* PLL disabled, apply bypass divisor */
 721                         switch (pll_ctl_val & 0xc) {
 722                         case 0:
 723                                 break;
 724                         case 0x4:
 725                                 ck_dpll1.rate /= 2;
 726                                 break;
 727                         default:
 728                                 ck_dpll1.rate /= 4;
 729                                 break;
 730                         }
 731                 }
 732         }
 733         propagate_rate(&ck_dpll1);
 734 #else
 735         /* Find the highest supported frequency and enable it */
 736         if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
 737                 printk(KERN_ERR "System frequencies not set. Check your config.\n");
 738                 /* Guess sane values (60MHz) */
 739                 omap_writew(0x2290, DPLL_CTL);
 740                 omap_writew(cpu_is_omap730() ? 0x3005 : 0x1005, ARM_CKCTL);
 741                 ck_dpll1.rate = 60000000;
 742                 propagate_rate(&ck_dpll1);
 743         }
 744 #endif
 745         /* Cache rates for clocks connected to ck_ref (not dpll1) */
 746         propagate_rate(&ck_ref);
 747         printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
 748                 "%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
 749                ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
 750                ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
 751                arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
 752
 753 #if defined(CONFIG_MACH_OMAP_PERSEUS2) || defined(CONFIG_MACH_OMAP_FSAMPLE)
 754         /* Select slicer output as OMAP input clock */
 755         omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
 756 #endif
 757
 758         /* Amstrad Delta wants BCLK high when inactive */
 759         if (machine_is_ams_delta())
 760                 omap_writel(omap_readl(ULPD_CLOCK_CTRL) |
 761                                 (1 << SDW_MCLK_INV_BIT),
 762                                 ULPD_CLOCK_CTRL);
 763
 764         /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
 765         /* (on 730, bit 13 must not be cleared) */
 766         if (cpu_is_omap730())
 767                 omap_writew(omap_readw(ARM_CKCTL) & 0x2fff, ARM_CKCTL);
 768         else
 769                 omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
 770
 771         /* Put DSP/MPUI into reset until needed */
 772         omap_writew(0, ARM_RSTCT1);
 773         omap_writew(1, ARM_RSTCT2);
 774         omap_writew(0x400, ARM_IDLECT1);
 775
 776         /*
 777          * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
 778          * of the ARM_IDLECT2 register must be set to zero. The power-on
 779          * default value of this bit is one.
 780          */
 781         omap_writew(0x0000, ARM_IDLECT2);       /* Turn LCD clock off also */
 782
 783         /*
 784          * Only enable those clocks we will need, let the drivers
 785          * enable other clocks as necessary
 786          */
 787         clk_enable(&armper_ck.clk);
 788         clk_enable(&armxor_ck.clk);
 789         clk_enable(&armtim_ck.clk); /* This should be done by timer code */
 790
 791         if (cpu_is_omap15xx())
 792                 clk_enable(&arm_gpio_ck);
 793
 794         return 0;
 795 }
 796