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 void omap1_sossi_recalc(struct clk *clk)
  53 {
  54         u32 div = omap_readl(MOD_CONF_CTRL_1);
  55
  56         div = (div >> 17) & 0x7;
  57         div++;
  58         clk->rate = clk->parent->rate / div;
  59 }
  60
  61 static int omap1_clk_enable_dsp_domain(struct clk *clk)
  62 {
  63         int retval;
  64
  65         retval = omap1_clk_enable(&api_ck.clk);
  66         if (!retval) {
  67                 retval = omap1_clk_enable_generic(clk);
  68                 omap1_clk_disable(&api_ck.clk);
  69         }
  70
  71         return retval;
  72 }
  73
  74 static void omap1_clk_disable_dsp_domain(struct clk *clk)
  75 {
  76         if (omap1_clk_enable(&api_ck.clk) == 0) {
  77                 omap1_clk_disable_generic(clk);
  78                 omap1_clk_disable(&api_ck.clk);
  79         }
  80 }
  81
  82 static int omap1_clk_enable_uart_functional(struct clk *clk)
  83 {
  84         int ret;
  85         struct uart_clk *uclk;
  86
  87         ret = omap1_clk_enable_generic(clk);
  88         if (ret == 0) {
  89                 /* Set smart idle acknowledgement mode */
  90                 uclk = (struct uart_clk *)clk;
  91                 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x10) | 8,
  92                             uclk->sysc_addr);
  93         }
  94
  95         return ret;
  96 }
  97
  98 static void omap1_clk_disable_uart_functional(struct clk *clk)
  99 {
 100         struct uart_clk *uclk;
 101
 102         /* Set force idle acknowledgement mode */
 103         uclk = (struct uart_clk *)clk;
 104         omap_writeb((omap_readb(uclk->sysc_addr) & ~0x18), uclk->sysc_addr);
 105
 106         omap1_clk_disable_generic(clk);
 107 }
 108
 109 static void omap1_clk_allow_idle(struct clk *clk)
 110 {
 111         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 112
 113         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 114                 return;
 115
 116         if (iclk->no_idle_count > 0 && !(--iclk->no_idle_count))
 117                 arm_idlect1_mask |= 1 << iclk->idlect_shift;
 118 }
 119
 120 static void omap1_clk_deny_idle(struct clk *clk)
 121 {
 122         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 123
 124         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 125                 return;
 126
 127         if (iclk->no_idle_count++ == 0)
 128                 arm_idlect1_mask &= ~(1 << iclk->idlect_shift);
 129 }
 130
 131 static __u16 verify_ckctl_value(__u16 newval)
 132 {
 133         /* This function checks for following limitations set
 134          * by the hardware (all conditions must be true):
 135          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 136          * ARM_CK >= TC_CK
 137          * DSP_CK >= TC_CK
 138          * DSPMMU_CK >= TC_CK
 139          *
 140          * In addition following rules are enforced:
 141          * LCD_CK <= TC_CK
 142          * ARMPER_CK <= TC_CK
 143          *
 144          * However, maximum frequencies are not checked for!
 145          */
 146         __u8 per_exp;
 147         __u8 lcd_exp;
 148         __u8 arm_exp;
 149         __u8 dsp_exp;
 150         __u8 tc_exp;
 151         __u8 dspmmu_exp;
 152
 153         per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
 154         lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
 155         arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
 156         dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
 157         tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
 158         dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
 159
 160         if (dspmmu_exp < dsp_exp)
 161                 dspmmu_exp = dsp_exp;
 162         if (dspmmu_exp > dsp_exp+1)
 163                 dspmmu_exp = dsp_exp+1;
 164         if (tc_exp < arm_exp)
 165                 tc_exp = arm_exp;
 166         if (tc_exp < dspmmu_exp)
 167                 tc_exp = dspmmu_exp;
 168         if (tc_exp > lcd_exp)
 169                 lcd_exp = tc_exp;
 170         if (tc_exp > per_exp)
 171                 per_exp = tc_exp;
 172
 173         newval &= 0xf000;
 174         newval |= per_exp << CKCTL_PERDIV_OFFSET;
 175         newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
 176         newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
 177         newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
 178         newval |= tc_exp << CKCTL_TCDIV_OFFSET;
 179         newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
 180
 181         return newval;
 182 }
 183
 184 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
 185 {
 186         /* Note: If target frequency is too low, this function will return 4,
 187          * which is invalid value. Caller must check for this value and act
 188          * accordingly.
 189          *
 190          * Note: This function does not check for following limitations set
 191          * by the hardware (all conditions must be true):
 192          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 193          * ARM_CK >= TC_CK
 194          * DSP_CK >= TC_CK
 195          * DSPMMU_CK >= TC_CK
 196          */
 197         unsigned long realrate;
 198         struct clk * parent;
 199         unsigned  dsor_exp;
 200
 201         if (unlikely(!(clk->flags & RATE_CKCTL)))
 202                 return -EINVAL;
 203
 204         parent = clk->parent;
 205         if (unlikely(parent == 0))
 206                 return -EIO;
 207
 208         realrate = parent->rate;
 209         for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
 210                 if (realrate <= rate)
 211                         break;
 212
 213                 realrate /= 2;
 214         }
 215
 216         return dsor_exp;
 217 }
 218
 219 static void omap1_ckctl_recalc(struct clk * clk)
 220 {
 221         int dsor;
 222
 223         /* Calculate divisor encoded as 2-bit exponent */
 224         dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
 225
 226         if (unlikely(clk->rate == clk->parent->rate / dsor))
 227                 return; /* No change, quick exit */
 228         clk->rate = clk->parent->rate / dsor;
 229
 230         if (unlikely(clk->flags & RATE_PROPAGATES))
 231                 propagate_rate(clk);
 232 }
 233
 234 static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
 235 {
 236         int dsor;
 237
 238         /* Calculate divisor encoded as 2-bit exponent
 239          *
 240          * The clock control bits are in DSP domain,
 241          * so api_ck is needed for access.
 242          * Note that DSP_CKCTL virt addr = phys addr, so
 243          * we must use __raw_readw() instead of omap_readw().
 244          */
 245         omap1_clk_enable(&api_ck.clk);
 246         dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
 247         omap1_clk_disable(&api_ck.clk);
 248
 249         if (unlikely(clk->rate == clk->parent->rate / dsor))
 250                 return; /* No change, quick exit */
 251         clk->rate = clk->parent->rate / dsor;
 252
 253         if (unlikely(clk->flags & RATE_PROPAGATES))
 254                 propagate_rate(clk);
 255 }
 256
 257 /* MPU virtual clock functions */
 258 static int omap1_select_table_rate(struct clk * clk, unsigned long rate)
 259 {
 260         /* Find the highest supported frequency <= rate and switch to it */
 261         struct mpu_rate * ptr;
 262
 263         if (clk != &virtual_ck_mpu)
 264                 return -EINVAL;
 265
 266         for (ptr = rate_table; ptr->rate; ptr++) {
 267                 if (ptr->xtal != ck_ref.rate)
 268                         continue;
 269
 270                 /* DPLL1 cannot be reprogrammed without risking system crash */
 271                 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
 272                         continue;
 273
 274                 /* Can check only after xtal frequency check */
 275                 if (ptr->rate <= rate)
 276                         break;
 277         }
 278
 279         if (!ptr->rate)
 280                 return -EINVAL;
 281
 282         /*
 283          * In most cases we should not need to reprogram DPLL.
 284          * Reprogramming the DPLL is tricky, it must be done from SRAM.
 285          * (on 730, bit 13 must always be 1)
 286          */
 287         if (cpu_is_omap730())
 288                 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val | 0x2000);
 289         else
 290                 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
 291
 292         ck_dpll1.rate = ptr->pll_rate;
 293         propagate_rate(&ck_dpll1);
 294         return 0;
 295 }
 296
 297 static int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate)
 298 {
 299         int  ret = -EINVAL;
 300         int  dsor_exp;
 301         __u16  regval;
 302
 303         if (clk->flags & RATE_CKCTL) {
 304                 dsor_exp = calc_dsor_exp(clk, rate);
 305                 if (dsor_exp > 3)
 306                         dsor_exp = -EINVAL;
 307                 if (dsor_exp < 0)
 308                         return dsor_exp;
 309
 310                 regval = __raw_readw(DSP_CKCTL);
 311                 regval &= ~(3 << clk->rate_offset);
 312                 regval |= dsor_exp << clk->rate_offset;
 313                 __raw_writew(regval, DSP_CKCTL);
 314                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 315                 ret = 0;
 316         }
 317
 318         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 319                 propagate_rate(clk);
 320
 321         return ret;
 322 }
 323
 324 static long omap1_round_to_table_rate(struct clk * clk, unsigned long rate)
 325 {
 326         /* Find the highest supported frequency <= rate */
 327         struct mpu_rate * ptr;
 328         long  highest_rate;
 329
 330         if (clk != &virtual_ck_mpu)
 331                 return -EINVAL;
 332
 333         highest_rate = -EINVAL;
 334
 335         for (ptr = rate_table; ptr->rate; ptr++) {
 336                 if (ptr->xtal != ck_ref.rate)
 337                         continue;
 338
 339                 highest_rate = ptr->rate;
 340
 341                 /* Can check only after xtal frequency check */
 342                 if (ptr->rate <= rate)
 343                         break;
 344         }
 345
 346         return highest_rate;
 347 }
 348
 349 static unsigned calc_ext_dsor(unsigned long rate)
 350 {
 351         unsigned dsor;
 352
 353         /* MCLK and BCLK divisor selection is not linear:
 354          * freq = 96MHz / dsor
 355          *
 356          * RATIO_SEL range: dsor <-> RATIO_SEL
 357          * 0..6: (RATIO_SEL+2) <-> (dsor-2)
 358          * 6..48:  (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
 359          * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
 360          * can not be used.
 361          */
 362         for (dsor = 2; dsor < 96; ++dsor) {
 363                 if ((dsor & 1) && dsor > 8)
 364                         continue;
 365                 if (rate >= 96000000 / dsor)
 366                         break;
 367         }
 368         return dsor;
 369 }
 370
 371 /* Only needed on 1510 */
 372 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate)
 373 {
 374         unsigned int val;
 375
 376         val = omap_readl(clk->enable_reg);
 377         if (rate == 12000000)
 378                 val &= ~(1 << clk->enable_bit);
 379         else if (rate == 48000000)
 380                 val |= (1 << clk->enable_bit);
 381         else
 382                 return -EINVAL;
 383         omap_writel(val, clk->enable_reg);
 384         clk->rate = rate;
 385
 386         return 0;
 387 }
 388
 389 /* External clock (MCLK & BCLK) functions */
 390 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate)
 391 {
 392         unsigned dsor;
 393         __u16 ratio_bits;
 394
 395         dsor = calc_ext_dsor(rate);
 396         clk->rate = 96000000 / dsor;
 397         if (dsor > 8)
 398                 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
 399         else
 400                 ratio_bits = (dsor - 2) << 2;
 401
 402         ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
 403         omap_writew(ratio_bits, clk->enable_reg);
 404
 405         return 0;
 406 }
 407
 408 static int omap1_set_sossi_rate(struct clk *clk, unsigned long rate)
 409 {
 410         u32 l;
 411         int div;
 412         unsigned long p_rate;
 413
 414         p_rate = clk->parent->rate;
 415         /* Round towards slower frequency */
 416         div = (p_rate + rate - 1) / rate;
 417         div--;
 418         if (div < 0 || div > 7)
 419                 return -EINVAL;
 420
 421         l = omap_readl(MOD_CONF_CTRL_1);
 422         l &= ~(7 << 17);
 423         l |= div << 17;
 424         omap_writel(l, MOD_CONF_CTRL_1);
 425
 426         clk->rate = p_rate / (div + 1);
 427         if (unlikely(clk->flags & RATE_PROPAGATES))
 428                 propagate_rate(clk);
 429
 430         return 0;
 431 }
 432
 433 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate)
 434 {
 435         return 96000000 / calc_ext_dsor(rate);
 436 }
 437
 438 static void omap1_init_ext_clk(struct clk * clk)
 439 {
 440         unsigned dsor;
 441         __u16 ratio_bits;
 442
 443         /* Determine current rate and ensure clock is based on 96MHz APLL */
 444         ratio_bits = omap_readw(clk->enable_reg) & ~1;
 445         omap_writew(ratio_bits, clk->enable_reg);
 446
 447         ratio_bits = (ratio_bits & 0xfc) >> 2;
 448         if (ratio_bits > 6)
 449                 dsor = (ratio_bits - 6) * 2 + 8;
 450         else
 451                 dsor = ratio_bits + 2;
 452
 453         clk-> rate = 96000000 / dsor;
 454 }
 455
 456 static int omap1_clk_enable(struct clk *clk)
 457 {
 458         int ret = 0;
 459         if (clk->usecount++ == 0) {
 460                 if (likely(clk->parent)) {
 461                         ret = omap1_clk_enable(clk->parent);
 462
 463                         if (unlikely(ret != 0)) {
 464                                 clk->usecount--;
 465                                 return ret;
 466                         }
 467
 468                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 469                                 omap1_clk_deny_idle(clk->parent);
 470                 }
 471
 472                 ret = clk->enable(clk);
 473
 474                 if (unlikely(ret != 0) && clk->parent) {
 475                         omap1_clk_disable(clk->parent);
 476                         clk->usecount--;
 477                 }
 478         }
 479
 480         return ret;
 481 }
 482
 483 static void omap1_clk_disable(struct clk *clk)
 484 {
 485         if (clk->usecount > 0 && !(--clk->usecount)) {
 486                 clk->disable(clk);
 487                 if (likely(clk->parent)) {
 488                         omap1_clk_disable(clk->parent);
 489                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 490                                 omap1_clk_allow_idle(clk->parent);
 491                 }
 492         }
 493 }
 494
 495 static int omap1_clk_enable_generic(struct clk *clk)
 496 {
 497         __u16 regval16;
 498         __u32 regval32;
 499
 500         if (clk->flags & ALWAYS_ENABLED)
 501                 return 0;
 502
 503         if (unlikely(clk->enable_reg == 0)) {
 504                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 505                        clk->name);
 506                 return -EINVAL;
 507         }
 508
 509         if (clk->flags & ENABLE_REG_32BIT) {
 510                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 511                         regval32 = __raw_readl(clk->enable_reg);
 512                         regval32 |= (1 << clk->enable_bit);
 513                         __raw_writel(regval32, clk->enable_reg);
 514                 } else {
 515                         regval32 = omap_readl(clk->enable_reg);
 516                         regval32 |= (1 << clk->enable_bit);
 517                         omap_writel(regval32, clk->enable_reg);
 518                 }
 519         } else {
 520                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 521                         regval16 = __raw_readw(clk->enable_reg);
 522                         regval16 |= (1 << clk->enable_bit);
 523                         __raw_writew(regval16, clk->enable_reg);
 524                 } else {
 525                         regval16 = omap_readw(clk->enable_reg);
 526                         regval16 |= (1 << clk->enable_bit);
 527                         omap_writew(regval16, clk->enable_reg);
 528                 }
 529         }
 530
 531         return 0;
 532 }
 533
 534 static void omap1_clk_disable_generic(struct clk *clk)
 535 {
 536         __u16 regval16;
 537         __u32 regval32;
 538
 539         if (clk->enable_reg == 0)
 540                 return;
 541
 542         if (clk->flags & ENABLE_REG_32BIT) {
 543                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 544                         regval32 = __raw_readl(clk->enable_reg);
 545                         regval32 &= ~(1 << clk->enable_bit);
 546                         __raw_writel(regval32, clk->enable_reg);
 547                 } else {
 548                         regval32 = omap_readl(clk->enable_reg);
 549                         regval32 &= ~(1 << clk->enable_bit);
 550                         omap_writel(regval32, clk->enable_reg);
 551                 }
 552         } else {
 553                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 554                         regval16 = __raw_readw(clk->enable_reg);
 555                         regval16 &= ~(1 << clk->enable_bit);
 556                         __raw_writew(regval16, clk->enable_reg);
 557                 } else {
 558                         regval16 = omap_readw(clk->enable_reg);
 559                         regval16 &= ~(1 << clk->enable_bit);
 560                         omap_writew(regval16, clk->enable_reg);
 561                 }
 562         }
 563 }
 564
 565 static long omap1_clk_round_rate(struct clk *clk, unsigned long rate)
 566 {
 567         int dsor_exp;
 568
 569         if (clk->flags & RATE_FIXED)
 570                 return clk->rate;
 571
 572         if (clk->flags & RATE_CKCTL) {
 573                 dsor_exp = calc_dsor_exp(clk, rate);
 574                 if (dsor_exp < 0)
 575                         return dsor_exp;
 576                 if (dsor_exp > 3)
 577                         dsor_exp = 3;
 578                 return clk->parent->rate / (1 << dsor_exp);
 579         }
 580
 581         if(clk->round_rate != 0)
 582                 return clk->round_rate(clk, rate);
 583
 584         return clk->rate;
 585 }
 586
 587 static int omap1_clk_set_rate(struct clk *clk, unsigned long rate)
 588 {
 589         int  ret = -EINVAL;
 590         int  dsor_exp;
 591         __u16  regval;
 592
 593         if (clk->set_rate)
 594                 ret = clk->set_rate(clk, rate);
 595         else if (clk->flags & RATE_CKCTL) {
 596                 dsor_exp = calc_dsor_exp(clk, rate);
 597                 if (dsor_exp > 3)
 598                         dsor_exp = -EINVAL;
 599                 if (dsor_exp < 0)
 600                         return dsor_exp;
 601
 602                 regval = omap_readw(ARM_CKCTL);
 603                 regval &= ~(3 << clk->rate_offset);
 604                 regval |= dsor_exp << clk->rate_offset;
 605                 regval = verify_ckctl_value(regval);
 606                 omap_writew(regval, ARM_CKCTL);
 607                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 608                 ret = 0;
 609         }
 610
 611         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 612                 propagate_rate(clk);
 613
 614         return ret;
 615 }
 616
 617 /*-------------------------------------------------------------------------
 618  * Omap1 clock reset and init functions
 619  *-------------------------------------------------------------------------*/
 620
 621 #ifdef CONFIG_OMAP_RESET_CLOCKS
 622
 623 static void __init omap1_clk_disable_unused(struct clk *clk)
 624 {
 625         __u32 regval32;
 626
 627         /* Clocks in the DSP domain need api_ck. Just assume bootloader
 628          * has not enabled any DSP clocks */
 629         if ((u32)clk->enable_reg == DSP_IDLECT2) {
 630                 printk(KERN_INFO "Skipping reset check for DSP domain "
 631                        "clock \"%s\"\n", clk->name);
 632                 return;
 633         }
 634
 635         /* Is the clock already disabled? */
 636         if (clk->flags & ENABLE_REG_32BIT) {
 637                 if (clk->flags & VIRTUAL_IO_ADDRESS)
 638                         regval32 = __raw_readl(clk->enable_reg);
 639                         else
 640                                 regval32 = omap_readl(clk->enable_reg);
 641         } else {
 642                 if (clk->flags & VIRTUAL_IO_ADDRESS)
 643                         regval32 = __raw_readw(clk->enable_reg);
 644                 else
 645                         regval32 = omap_readw(clk->enable_reg);
 646         }
 647
 648         if ((regval32 & (1 << clk->enable_bit)) == 0)
 649                 return;
 650
 651         /* FIXME: This clock seems to be necessary but no-one
 652          * has asked for its activation. */
 653         if (clk == &tc2_ck              // FIX: pm.c (SRAM), CCP, Camera
 654             || clk == &ck_dpll1out.clk  // FIX: SoSSI, SSR
 655             || clk == &arm_gpio_ck      // FIX: GPIO code for 1510
 656                 ) {
 657                 printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
 658                        clk->name);
 659                 return;
 660         }
 661
 662         printk(KERN_INFO "Disabling unused clock \"%s\"... ", clk->name);
 663         clk->disable(clk);
 664         printk(" done\n");
 665 }
 666
 667 #else
 668 #define omap1_clk_disable_unused        NULL
 669 #endif
 670
 671 static struct clk_functions omap1_clk_functions = {
 672         .clk_enable             = omap1_clk_enable,
 673         .clk_disable            = omap1_clk_disable,
 674         .clk_round_rate         = omap1_clk_round_rate,
 675         .clk_set_rate           = omap1_clk_set_rate,
 676         .clk_disable_unused     = omap1_clk_disable_unused,
 677 };
 678
 679 int __init omap1_clk_init(void)
 680 {
 681         struct clk ** clkp;
 682         const struct omap_clock_config *info;
 683         int crystal_type = 0; /* Default 12 MHz */
 684         u32 reg;
 685
 686 #ifdef CONFIG_DEBUG_LL
 687         /* Resets some clocks that may be left on from bootloader,
 688          * but leaves serial clocks on.
 689          */
 690         omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
 691 #endif
 692
 693         /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
 694         reg = omap_readw(SOFT_REQ_REG) & (1 << 4);
 695         omap_writew(reg, SOFT_REQ_REG);
 696         if (!cpu_is_omap15xx())
 697                 omap_writew(0, SOFT_REQ_REG2);
 698
 699         clk_init(&omap1_clk_functions);
 700
 701         /* By default all idlect1 clocks are allowed to idle */
 702         arm_idlect1_mask = ~0;
 703
 704         for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
 705                 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
 706                         clk_register(*clkp);
 707                         continue;
 708                 }
 709
 710                 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
 711                         clk_register(*clkp);
 712                         continue;
 713                 }
 714
 715                 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
 716                         clk_register(*clkp);
 717                         continue;
 718                 }
 719
 720                 if (((*clkp)->flags &CLOCK_IN_OMAP310) && cpu_is_omap310()) {
 721                         clk_register(*clkp);
 722                         continue;
 723                 }
 724         }
 725
 726         info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
 727         if (info != NULL) {
 728                 if (!cpu_is_omap15xx())
 729                         crystal_type = info->system_clock_type;
 730         }
 731
 732 #if defined(CONFIG_ARCH_OMAP730)
 733         ck_ref.rate = 13000000;
 734 #elif defined(CONFIG_ARCH_OMAP16XX)
 735         if (crystal_type == 2)
 736                 ck_ref.rate = 19200000;
 737 #endif
 738
 739         printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
 740                omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
 741                omap_readw(ARM_CKCTL));
 742
 743         /* We want to be in syncronous scalable mode */
 744         omap_writew(0x1000, ARM_SYSST);
 745
 746 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
 747         /* Use values set by bootloader. Determine PLL rate and recalculate
 748          * dependent clocks as if kernel had changed PLL or divisors.
 749          */
 750         {
 751                 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
 752
 753                 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
 754                 if (pll_ctl_val & 0x10) {
 755                         /* PLL enabled, apply multiplier and divisor */
 756                         if (pll_ctl_val & 0xf80)
 757                                 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
 758                         ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
 759                 } else {
 760                         /* PLL disabled, apply bypass divisor */
 761                         switch (pll_ctl_val & 0xc) {
 762                         case 0:
 763                                 break;
 764                         case 0x4:
 765                                 ck_dpll1.rate /= 2;
 766                                 break;
 767                         default:
 768                                 ck_dpll1.rate /= 4;
 769                                 break;
 770                         }
 771                 }
 772         }
 773         propagate_rate(&ck_dpll1);
 774 #else
 775         /* Find the highest supported frequency and enable it */
 776         if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
 777                 printk(KERN_ERR "System frequencies not set. Check your config.\n");
 778                 /* Guess sane values (60MHz) */
 779                 omap_writew(0x2290, DPLL_CTL);
 780                 omap_writew(cpu_is_omap730() ? 0x3005 : 0x1005, ARM_CKCTL);
 781                 ck_dpll1.rate = 60000000;
 782                 propagate_rate(&ck_dpll1);
 783         }
 784 #endif
 785         /* Cache rates for clocks connected to ck_ref (not dpll1) */
 786         propagate_rate(&ck_ref);
 787         printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
 788                 "%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
 789                ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
 790                ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
 791                arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
 792
 793 #if defined(CONFIG_MACH_OMAP_PERSEUS2) || defined(CONFIG_MACH_OMAP_FSAMPLE)
 794         /* Select slicer output as OMAP input clock */
 795         omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
 796 #endif
 797
 798         /* Amstrad Delta wants BCLK high when inactive */
 799         if (machine_is_ams_delta())
 800                 omap_writel(omap_readl(ULPD_CLOCK_CTRL) |
 801                                 (1 << SDW_MCLK_INV_BIT),
 802                                 ULPD_CLOCK_CTRL);
 803
 804         /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
 805         /* (on 730, bit 13 must not be cleared) */
 806         if (cpu_is_omap730())
 807                 omap_writew(omap_readw(ARM_CKCTL) & 0x2fff, ARM_CKCTL);
 808         else
 809                 omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
 810
 811         /* Put DSP/MPUI into reset until needed */
 812         omap_writew(0, ARM_RSTCT1);
 813         omap_writew(1, ARM_RSTCT2);
 814         omap_writew(0x400, ARM_IDLECT1);
 815
 816         /*
 817          * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
 818          * of the ARM_IDLECT2 register must be set to zero. The power-on
 819          * default value of this bit is one.
 820          */
 821         omap_writew(0x0000, ARM_IDLECT2);       /* Turn LCD clock off also */
 822
 823         /*
 824          * Only enable those clocks we will need, let the drivers
 825          * enable other clocks as necessary
 826          */
 827         clk_enable(&armper_ck.clk);
 828         clk_enable(&armxor_ck.clk);
 829         clk_enable(&armtim_ck.clk); /* This should be done by timer code */
 830
 831         if (cpu_is_omap15xx())
 832                 clk_enable(&arm_gpio_ck);
 833
 834         return 0;
 835 }
 836