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 #include <asm/mach-types.h>
  23
  24 #include <mach/cpu.h>
  25 #include <mach/usb.h>
  26 #include <mach/clock.h>
  27 #include <mach/sram.h>
  28
  29 #include "clock.h"
  30
  31 __u32 arm_idlect1_mask;
  32
  33 /*-------------------------------------------------------------------------
  34  * Omap1 specific clock functions
  35  *-------------------------------------------------------------------------*/
  36
  37 static void omap1_watchdog_recalc(struct clk * clk)
  38 {
  39         clk->rate = clk->parent->rate / 14;
  40 }
  41
  42 static void omap1_uart_recalc(struct clk * clk)
  43 {
  44         unsigned int val = omap_readl(clk->enable_reg);
  45         if (val & clk->enable_bit)
  46                 clk->rate = 48000000;
  47         else
  48                 clk->rate = 12000000;
  49 }
  50
  51 static void omap1_sossi_recalc(struct clk *clk)
  52 {
  53         u32 div = omap_readl(MOD_CONF_CTRL_1);
  54
  55         div = (div >> 17) & 0x7;
  56         div++;
  57         clk->rate = clk->parent->rate / div;
  58 }
  59
  60 static int omap1_clk_enable_dsp_domain(struct clk *clk)
  61 {
  62         int retval;
  63
  64         retval = omap1_clk_enable(&api_ck.clk);
  65         if (!retval) {
  66                 retval = omap1_clk_enable_generic(clk);
  67                 omap1_clk_disable(&api_ck.clk);
  68         }
  69
  70         return retval;
  71 }
  72
  73 static void omap1_clk_disable_dsp_domain(struct clk *clk)
  74 {
  75         if (omap1_clk_enable(&api_ck.clk) == 0) {
  76                 omap1_clk_disable_generic(clk);
  77                 omap1_clk_disable(&api_ck.clk);
  78         }
  79 }
  80
  81 static int omap1_clk_enable_uart_functional(struct clk *clk)
  82 {
  83         int ret;
  84         struct uart_clk *uclk;
  85
  86         ret = omap1_clk_enable_generic(clk);
  87         if (ret == 0) {
  88                 /* Set smart idle acknowledgement mode */
  89                 uclk = (struct uart_clk *)clk;
  90                 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x10) | 8,
  91                             uclk->sysc_addr);
  92         }
  93
  94         return ret;
  95 }
  96
  97 static void omap1_clk_disable_uart_functional(struct clk *clk)
  98 {
  99         struct uart_clk *uclk;
 100
 101         /* Set force idle acknowledgement mode */
 102         uclk = (struct uart_clk *)clk;
 103         omap_writeb((omap_readb(uclk->sysc_addr) & ~0x18), uclk->sysc_addr);
 104
 105         omap1_clk_disable_generic(clk);
 106 }
 107
 108 static void omap1_clk_allow_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 && !(--iclk->no_idle_count))
 116                 arm_idlect1_mask |= 1 << iclk->idlect_shift;
 117 }
 118
 119 static void omap1_clk_deny_idle(struct clk *clk)
 120 {
 121         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 122
 123         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 124                 return;
 125
 126         if (iclk->no_idle_count++ == 0)
 127                 arm_idlect1_mask &= ~(1 << iclk->idlect_shift);
 128 }
 129
 130 static __u16 verify_ckctl_value(__u16 newval)
 131 {
 132         /* This function checks for following limitations set
 133          * by the hardware (all conditions must be true):
 134          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 135          * ARM_CK >= TC_CK
 136          * DSP_CK >= TC_CK
 137          * DSPMMU_CK >= TC_CK
 138          *
 139          * In addition following rules are enforced:
 140          * LCD_CK <= TC_CK
 141          * ARMPER_CK <= TC_CK
 142          *
 143          * However, maximum frequencies are not checked for!
 144          */
 145         __u8 per_exp;
 146         __u8 lcd_exp;
 147         __u8 arm_exp;
 148         __u8 dsp_exp;
 149         __u8 tc_exp;
 150         __u8 dspmmu_exp;
 151
 152         per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
 153         lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
 154         arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
 155         dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
 156         tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
 157         dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
 158
 159         if (dspmmu_exp < dsp_exp)
 160                 dspmmu_exp = dsp_exp;
 161         if (dspmmu_exp > dsp_exp+1)
 162                 dspmmu_exp = dsp_exp+1;
 163         if (tc_exp < arm_exp)
 164                 tc_exp = arm_exp;
 165         if (tc_exp < dspmmu_exp)
 166                 tc_exp = dspmmu_exp;
 167         if (tc_exp > lcd_exp)
 168                 lcd_exp = tc_exp;
 169         if (tc_exp > per_exp)
 170                 per_exp = tc_exp;
 171
 172         newval &= 0xf000;
 173         newval |= per_exp << CKCTL_PERDIV_OFFSET;
 174         newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
 175         newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
 176         newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
 177         newval |= tc_exp << CKCTL_TCDIV_OFFSET;
 178         newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
 179
 180         return newval;
 181 }
 182
 183 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
 184 {
 185         /* Note: If target frequency is too low, this function will return 4,
 186          * which is invalid value. Caller must check for this value and act
 187          * accordingly.
 188          *
 189          * Note: This function does not check for following limitations set
 190          * by the hardware (all conditions must be true):
 191          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 192          * ARM_CK >= TC_CK
 193          * DSP_CK >= TC_CK
 194          * DSPMMU_CK >= TC_CK
 195          */
 196         unsigned long realrate;
 197         struct clk * parent;
 198         unsigned  dsor_exp;
 199
 200         if (unlikely(!(clk->flags & RATE_CKCTL)))
 201                 return -EINVAL;
 202
 203         parent = clk->parent;
 204         if (unlikely(parent == 0))
 205                 return -EIO;
 206
 207         realrate = parent->rate;
 208         for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
 209                 if (realrate <= rate)
 210                         break;
 211
 212                 realrate /= 2;
 213         }
 214
 215         return dsor_exp;
 216 }
 217
 218 static void omap1_ckctl_recalc(struct clk * clk)
 219 {
 220         int dsor;
 221
 222         /* Calculate divisor encoded as 2-bit exponent */
 223         dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
 224
 225         if (unlikely(clk->rate == clk->parent->rate / dsor))
 226                 return; /* No change, quick exit */
 227         clk->rate = clk->parent->rate / dsor;
 228
 229         if (unlikely(clk->flags & RATE_PROPAGATES))
 230                 propagate_rate(clk);
 231 }
 232
 233 static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
 234 {
 235         int dsor;
 236
 237         /* Calculate divisor encoded as 2-bit exponent
 238          *
 239          * The clock control bits are in DSP domain,
 240          * so api_ck is needed for access.
 241          * Note that DSP_CKCTL virt addr = phys addr, so
 242          * we must use __raw_readw() instead of omap_readw().
 243          */
 244         omap1_clk_enable(&api_ck.clk);
 245         dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
 246         omap1_clk_disable(&api_ck.clk);
 247
 248         if (unlikely(clk->rate == clk->parent->rate / dsor))
 249                 return; /* No change, quick exit */
 250         clk->rate = clk->parent->rate / dsor;
 251
 252         if (unlikely(clk->flags & RATE_PROPAGATES))
 253                 propagate_rate(clk);
 254 }
 255
 256 /* MPU virtual clock functions */
 257 static int omap1_select_table_rate(struct clk * clk, unsigned long rate)
 258 {
 259         /* Find the highest supported frequency <= rate and switch to it */
 260         struct mpu_rate * ptr;
 261
 262         if (clk != &virtual_ck_mpu)
 263                 return -EINVAL;
 264
 265         for (ptr = rate_table; ptr->rate; ptr++) {
 266                 if (ptr->xtal != ck_ref.rate)
 267                         continue;
 268
 269                 /* DPLL1 cannot be reprogrammed without risking system crash */
 270                 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
 271                         continue;
 272
 273                 /* Can check only after xtal frequency check */
 274                 if (ptr->rate <= rate)
 275                         break;
 276         }
 277
 278         if (!ptr->rate)
 279                 return -EINVAL;
 280
 281         /*
 282          * In most cases we should not need to reprogram DPLL.
 283          * Reprogramming the DPLL is tricky, it must be done from SRAM.
 284          * (on 730, bit 13 must always be 1)
 285          */
 286         if (cpu_is_omap730())
 287                 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val | 0x2000);
 288         else
 289                 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
 290
 291         ck_dpll1.rate = ptr->pll_rate;
 292         propagate_rate(&ck_dpll1);
 293         return 0;
 294 }
 295
 296 static int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate)
 297 {
 298         int  ret = -EINVAL;
 299         int  dsor_exp;
 300         __u16  regval;
 301
 302         if (clk->flags & RATE_CKCTL) {
 303                 dsor_exp = calc_dsor_exp(clk, rate);
 304                 if (dsor_exp > 3)
 305                         dsor_exp = -EINVAL;
 306                 if (dsor_exp < 0)
 307                         return dsor_exp;
 308
 309                 regval = __raw_readw(DSP_CKCTL);
 310                 regval &= ~(3 << clk->rate_offset);
 311                 regval |= dsor_exp << clk->rate_offset;
 312                 __raw_writew(regval, DSP_CKCTL);
 313                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 314                 ret = 0;
 315         }
 316
 317         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 318                 propagate_rate(clk);
 319
 320         return ret;
 321 }
 322
 323 static long omap1_round_to_table_rate(struct clk * clk, unsigned long rate)
 324 {
 325         /* Find the highest supported frequency <= rate */
 326         struct mpu_rate * ptr;
 327         long  highest_rate;
 328
 329         if (clk != &virtual_ck_mpu)
 330                 return -EINVAL;
 331
 332         highest_rate = -EINVAL;
 333
 334         for (ptr = rate_table; ptr->rate; ptr++) {
 335                 if (ptr->xtal != ck_ref.rate)
 336                         continue;
 337
 338                 highest_rate = ptr->rate;
 339
 340                 /* Can check only after xtal frequency check */
 341                 if (ptr->rate <= rate)
 342                         break;
 343         }
 344
 345         return highest_rate;
 346 }
 347
 348 static unsigned calc_ext_dsor(unsigned long rate)
 349 {
 350         unsigned dsor;
 351
 352         /* MCLK and BCLK divisor selection is not linear:
 353          * freq = 96MHz / dsor
 354          *
 355          * RATIO_SEL range: dsor <-> RATIO_SEL
 356          * 0..6: (RATIO_SEL+2) <-> (dsor-2)
 357          * 6..48:  (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
 358          * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
 359          * can not be used.
 360          */
 361         for (dsor = 2; dsor < 96; ++dsor) {
 362                 if ((dsor & 1) && dsor > 8)
 363                         continue;
 364                 if (rate >= 96000000 / dsor)
 365                         break;
 366         }
 367         return dsor;
 368 }
 369
 370 /* Only needed on 1510 */
 371 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate)
 372 {
 373         unsigned int val;
 374
 375         val = omap_readl(clk->enable_reg);
 376         if (rate == 12000000)
 377                 val &= ~(1 << clk->enable_bit);
 378         else if (rate == 48000000)
 379                 val |= (1 << clk->enable_bit);
 380         else
 381                 return -EINVAL;
 382         omap_writel(val, clk->enable_reg);
 383         clk->rate = rate;
 384
 385         return 0;
 386 }
 387
 388 /* External clock (MCLK & BCLK) functions */
 389 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate)
 390 {
 391         unsigned dsor;
 392         __u16 ratio_bits;
 393
 394         dsor = calc_ext_dsor(rate);
 395         clk->rate = 96000000 / dsor;
 396         if (dsor > 8)
 397                 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
 398         else
 399                 ratio_bits = (dsor - 2) << 2;
 400
 401         ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
 402         omap_writew(ratio_bits, clk->enable_reg);
 403
 404         return 0;
 405 }
 406
 407 static int omap1_set_sossi_rate(struct clk *clk, unsigned long rate)
 408 {
 409         u32 l;
 410         int div;
 411         unsigned long p_rate;
 412
 413         p_rate = clk->parent->rate;
 414         /* Round towards slower frequency */
 415         div = (p_rate + rate - 1) / rate;
 416         div--;
 417         if (div < 0 || div > 7)
 418                 return -EINVAL;
 419
 420         l = omap_readl(MOD_CONF_CTRL_1);
 421         l &= ~(7 << 17);
 422         l |= div << 17;
 423         omap_writel(l, MOD_CONF_CTRL_1);
 424
 425         clk->rate = p_rate / (div + 1);
 426         if (unlikely(clk->flags & RATE_PROPAGATES))
 427                 propagate_rate(clk);
 428
 429         return 0;
 430 }
 431
 432 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate)
 433 {
 434         return 96000000 / calc_ext_dsor(rate);
 435 }
 436
 437 static void omap1_init_ext_clk(struct clk * clk)
 438 {
 439         unsigned dsor;
 440         __u16 ratio_bits;
 441
 442         /* Determine current rate and ensure clock is based on 96MHz APLL */
 443         ratio_bits = omap_readw(clk->enable_reg) & ~1;
 444         omap_writew(ratio_bits, clk->enable_reg);
 445
 446         ratio_bits = (ratio_bits & 0xfc) >> 2;
 447         if (ratio_bits > 6)
 448                 dsor = (ratio_bits - 6) * 2 + 8;
 449         else
 450                 dsor = ratio_bits + 2;
 451
 452         clk-> rate = 96000000 / dsor;
 453 }
 454
 455 static int omap1_clk_enable(struct clk *clk)
 456 {
 457         int ret = 0;
 458         if (clk->usecount++ == 0) {
 459                 if (likely(clk->parent)) {
 460                         ret = omap1_clk_enable(clk->parent);
 461
 462                         if (unlikely(ret != 0)) {
 463                                 clk->usecount--;
 464                                 return ret;
 465                         }
 466
 467                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 468                                 omap1_clk_deny_idle(clk->parent);
 469                 }
 470
 471                 ret = clk->enable(clk);
 472
 473                 if (unlikely(ret != 0) && clk->parent) {
 474                         omap1_clk_disable(clk->parent);
 475                         clk->usecount--;
 476                 }
 477         }
 478
 479         return ret;
 480 }
 481
 482 static void omap1_clk_disable(struct clk *clk)
 483 {
 484         if (clk->usecount > 0 && !(--clk->usecount)) {
 485                 clk->disable(clk);
 486                 if (likely(clk->parent)) {
 487                         omap1_clk_disable(clk->parent);
 488                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 489                                 omap1_clk_allow_idle(clk->parent);
 490                 }
 491         }
 492 }
 493
 494 static int omap1_clk_enable_generic(struct clk *clk)
 495 {
 496         __u16 regval16;
 497         __u32 regval32;
 498
 499         if (clk->flags & ALWAYS_ENABLED)
 500                 return 0;
 501
 502         if (unlikely(clk->enable_reg == 0)) {
 503                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 504                        clk->name);
 505                 return -EINVAL;
 506         }
 507
 508         if (clk->flags & ENABLE_REG_32BIT) {
 509                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 510                         regval32 = __raw_readl(clk->enable_reg);
 511                         regval32 |= (1 << clk->enable_bit);
 512                         __raw_writel(regval32, clk->enable_reg);
 513                 } else {
 514                         regval32 = omap_readl(clk->enable_reg);
 515                         regval32 |= (1 << clk->enable_bit);
 516                         omap_writel(regval32, clk->enable_reg);
 517                 }
 518         } else {
 519                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 520                         regval16 = __raw_readw(clk->enable_reg);
 521                         regval16 |= (1 << clk->enable_bit);
 522                         __raw_writew(regval16, clk->enable_reg);
 523                 } else {
 524                         regval16 = omap_readw(clk->enable_reg);
 525                         regval16 |= (1 << clk->enable_bit);
 526                         omap_writew(regval16, clk->enable_reg);
 527                 }
 528         }
 529
 530         return 0;
 531 }
 532
 533 static void omap1_clk_disable_generic(struct clk *clk)
 534 {
 535         __u16 regval16;
 536         __u32 regval32;
 537
 538         if (clk->enable_reg == 0)
 539                 return;
 540
 541         if (clk->flags & ENABLE_REG_32BIT) {
 542                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 543                         regval32 = __raw_readl(clk->enable_reg);
 544                         regval32 &= ~(1 << clk->enable_bit);
 545                         __raw_writel(regval32, clk->enable_reg);
 546                 } else {
 547                         regval32 = omap_readl(clk->enable_reg);
 548                         regval32 &= ~(1 << clk->enable_bit);
 549                         omap_writel(regval32, clk->enable_reg);
 550                 }
 551         } else {
 552                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 553                         regval16 = __raw_readw(clk->enable_reg);
 554                         regval16 &= ~(1 << clk->enable_bit);
 555                         __raw_writew(regval16, clk->enable_reg);
 556                 } else {
 557                         regval16 = omap_readw(clk->enable_reg);
 558                         regval16 &= ~(1 << clk->enable_bit);
 559                         omap_writew(regval16, clk->enable_reg);
 560                 }
 561         }
 562 }
 563
 564 static long omap1_clk_round_rate(struct clk *clk, unsigned long rate)
 565 {
 566         int dsor_exp;
 567
 568         if (clk->flags & RATE_FIXED)
 569                 return clk->rate;
 570
 571         if (clk->flags & RATE_CKCTL) {
 572                 dsor_exp = calc_dsor_exp(clk, rate);
 573                 if (dsor_exp < 0)
 574                         return dsor_exp;
 575                 if (dsor_exp > 3)
 576                         dsor_exp = 3;
 577                 return clk->parent->rate / (1 << dsor_exp);
 578         }
 579
 580         if(clk->round_rate != 0)
 581                 return clk->round_rate(clk, rate);
 582
 583         return clk->rate;
 584 }
 585
 586 static int omap1_clk_set_rate(struct clk *clk, unsigned long rate)
 587 {
 588         int  ret = -EINVAL;
 589         int  dsor_exp;
 590         __u16  regval;
 591
 592         if (clk->set_rate)
 593                 ret = clk->set_rate(clk, rate);
 594         else if (clk->flags & RATE_CKCTL) {
 595                 dsor_exp = calc_dsor_exp(clk, rate);
 596                 if (dsor_exp > 3)
 597                         dsor_exp = -EINVAL;
 598                 if (dsor_exp < 0)
 599                         return dsor_exp;
 600
 601                 regval = omap_readw(ARM_CKCTL);
 602                 regval &= ~(3 << clk->rate_offset);
 603                 regval |= dsor_exp << clk->rate_offset;
 604                 regval = verify_ckctl_value(regval);
 605                 omap_writew(regval, ARM_CKCTL);
 606                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 607                 ret = 0;
 608         }
 609
 610         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 611                 propagate_rate(clk);
 612
 613         return ret;
 614 }
 615
 616 /*-------------------------------------------------------------------------
 617  * Omap1 clock reset and init functions
 618  *-------------------------------------------------------------------------*/
 619
 620 #ifdef CONFIG_OMAP_RESET_CLOCKS
 621
 622 static void __init omap1_clk_disable_unused(struct clk *clk)
 623 {
 624         __u32 regval32;
 625
 626         /* Clocks in the DSP domain need api_ck. Just assume bootloader
 627          * has not enabled any DSP clocks */
 628         if ((u32)clk->enable_reg == DSP_IDLECT2) {
 629                 printk(KERN_INFO "Skipping reset check for DSP domain "
 630                        "clock \"%s\"\n", clk->name);
 631                 return;
 632         }
 633
 634         /* Is the clock already disabled? */
 635         if (clk->flags & ENABLE_REG_32BIT) {
 636                 if (clk->flags & VIRTUAL_IO_ADDRESS)
 637                         regval32 = __raw_readl(clk->enable_reg);
 638                         else
 639                                 regval32 = omap_readl(clk->enable_reg);
 640         } else {
 641                 if (clk->flags & VIRTUAL_IO_ADDRESS)
 642                         regval32 = __raw_readw(clk->enable_reg);
 643                 else
 644                         regval32 = omap_readw(clk->enable_reg);
 645         }
 646
 647         if ((regval32 & (1 << clk->enable_bit)) == 0)
 648                 return;
 649
 650         /* FIXME: This clock seems to be necessary but no-one
 651          * has asked for its activation. */
 652         if (clk == &tc2_ck              /* FIX: pm.c (SRAM), CCP, Camera */
 653             || clk == &ck_dpll1out.clk  /* FIX: SoSSI, SSR */
 654             || clk == &arm_gpio_ck      /* FIX: GPIO code for 1510 */
 655                 ) {
 656                 printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
 657                        clk->name);
 658                 return;
 659         }
 660
 661         printk(KERN_INFO "Disabling unused clock \"%s\"... ", clk->name);
 662         clk->disable(clk);
 663         printk(" done\n");
 664 }
 665
 666 #else
 667 #define omap1_clk_disable_unused        NULL
 668 #endif
 669
 670 static struct clk_functions omap1_clk_functions = {
 671         .clk_enable             = omap1_clk_enable,
 672         .clk_disable            = omap1_clk_disable,
 673         .clk_round_rate         = omap1_clk_round_rate,
 674         .clk_set_rate           = omap1_clk_set_rate,
 675         .clk_disable_unused     = omap1_clk_disable_unused,
 676 };
 677
 678 int __init omap1_clk_init(void)
 679 {
 680         struct clk ** clkp;
 681         const struct omap_clock_config *info;
 682         int crystal_type = 0; /* Default 12 MHz */
 683         u32 reg;
 684
 685 #ifdef CONFIG_DEBUG_LL
 686         /* Resets some clocks that may be left on from bootloader,
 687          * but leaves serial clocks on.
 688          */
 689         omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
 690 #endif
 691
 692         /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
 693         reg = omap_readw(SOFT_REQ_REG) & (1 << 4);
 694         omap_writew(reg, SOFT_REQ_REG);
 695         if (!cpu_is_omap15xx())
 696                 omap_writew(0, SOFT_REQ_REG2);
 697
 698         clk_init(&omap1_clk_functions);
 699
 700         /* By default all idlect1 clocks are allowed to idle */
 701         arm_idlect1_mask = ~0;
 702
 703         for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
 704                 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
 705                         clk_register(*clkp);
 706                         continue;
 707                 }
 708
 709                 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
 710                         clk_register(*clkp);
 711                         continue;
 712                 }
 713
 714                 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
 715                         clk_register(*clkp);
 716                         continue;
 717                 }
 718
 719                 if (((*clkp)->flags &CLOCK_IN_OMAP310) && cpu_is_omap310()) {
 720                         clk_register(*clkp);
 721                         continue;
 722                 }
 723         }
 724
 725         info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
 726         if (info != NULL) {
 727                 if (!cpu_is_omap15xx())
 728                         crystal_type = info->system_clock_type;
 729         }
 730
 731 #if defined(CONFIG_ARCH_OMAP730)
 732         ck_ref.rate = 13000000;
 733 #elif defined(CONFIG_ARCH_OMAP16XX)
 734         if (crystal_type == 2)
 735                 ck_ref.rate = 19200000;
 736 #endif
 737
 738         printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
 739                omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
 740                omap_readw(ARM_CKCTL));
 741
 742         /* We want to be in syncronous scalable mode */
 743         omap_writew(0x1000, ARM_SYSST);
 744
 745 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
 746         /* Use values set by bootloader. Determine PLL rate and recalculate
 747          * dependent clocks as if kernel had changed PLL or divisors.
 748          */
 749         {
 750                 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
 751
 752                 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
 753                 if (pll_ctl_val & 0x10) {
 754                         /* PLL enabled, apply multiplier and divisor */
 755                         if (pll_ctl_val & 0xf80)
 756                                 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
 757                         ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
 758                 } else {
 759                         /* PLL disabled, apply bypass divisor */
 760                         switch (pll_ctl_val & 0xc) {
 761                         case 0:
 762                                 break;
 763                         case 0x4:
 764                                 ck_dpll1.rate /= 2;
 765                                 break;
 766                         default:
 767                                 ck_dpll1.rate /= 4;
 768                                 break;
 769                         }
 770                 }
 771         }
 772         propagate_rate(&ck_dpll1);
 773 #else
 774         /* Find the highest supported frequency and enable it */
 775         if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
 776                 printk(KERN_ERR "System frequencies not set. Check your config.\n");
 777                 /* Guess sane values (60MHz) */
 778                 omap_writew(0x2290, DPLL_CTL);
 779                 omap_writew(cpu_is_omap730() ? 0x3005 : 0x1005, ARM_CKCTL);
 780                 ck_dpll1.rate = 60000000;
 781                 propagate_rate(&ck_dpll1);
 782         }
 783 #endif
 784         /* Cache rates for clocks connected to ck_ref (not dpll1) */
 785         propagate_rate(&ck_ref);
 786         printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
 787                 "%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
 788                ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
 789                ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
 790                arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
 791
 792 #if defined(CONFIG_MACH_OMAP_PERSEUS2) || defined(CONFIG_MACH_OMAP_FSAMPLE)
 793         /* Select slicer output as OMAP input clock */
 794         omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
 795 #endif
 796
 797         /* Amstrad Delta wants BCLK high when inactive */
 798         if (machine_is_ams_delta())
 799                 omap_writel(omap_readl(ULPD_CLOCK_CTRL) |
 800                                 (1 << SDW_MCLK_INV_BIT),
 801                                 ULPD_CLOCK_CTRL);
 802
 803         /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
 804         /* (on 730, bit 13 must not be cleared) */
 805         if (cpu_is_omap730())
 806                 omap_writew(omap_readw(ARM_CKCTL) & 0x2fff, ARM_CKCTL);
 807         else
 808                 omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
 809
 810         /* Put DSP/MPUI into reset until needed */
 811         omap_writew(0, ARM_RSTCT1);
 812         omap_writew(1, ARM_RSTCT2);
 813         omap_writew(0x400, ARM_IDLECT1);
 814
 815         /*
 816          * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
 817          * of the ARM_IDLECT2 register must be set to zero. The power-on
 818          * default value of this bit is one.
 819          */
 820         omap_writew(0x0000, ARM_IDLECT2);       /* Turn LCD clock off also */
 821
 822         /*
 823          * Only enable those clocks we will need, let the drivers
 824          * enable other clocks as necessary
 825          */
 826         clk_enable(&armper_ck.clk);
 827         clk_enable(&armxor_ck.clk);
 828         clk_enable(&armtim_ck.clk); /* This should be done by timer code */
 829
 830         if (cpu_is_omap15xx())
 831                 clk_enable(&arm_gpio_ck);
 832
 833         return 0;
 834 }
 835