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 #include <linux/io.h>
  21
  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 static const struct clkops clkops_generic;
  30 static const struct clkops clkops_uart;
  31 static const struct clkops clkops_dspck;
  32
  33 #include "clock.h"
  34
  35 static int omap1_clk_enable_generic(struct clk * clk);
  36 static int omap1_clk_enable(struct clk *clk);
  37 static void omap1_clk_disable_generic(struct clk * clk);
  38 static void omap1_clk_disable(struct clk *clk);
  39
  40 __u32 arm_idlect1_mask;
  41
  42 /*-------------------------------------------------------------------------
  43  * Omap1 specific clock functions
  44  *-------------------------------------------------------------------------*/
  45
  46 static void omap1_watchdog_recalc(struct clk * clk)
  47 {
  48         clk->rate = clk->parent->rate / 14;
  49 }
  50
  51 static void omap1_uart_recalc(struct clk * clk)
  52 {
  53         unsigned int val = omap_readl(clk->enable_reg);
  54         if (val & clk->enable_bit)
  55                 clk->rate = 48000000;
  56         else
  57                 clk->rate = 12000000;
  58 }
  59
  60 static void omap1_sossi_recalc(struct clk *clk)
  61 {
  62         u32 div = omap_readl(MOD_CONF_CTRL_1);
  63
  64         div = (div >> 17) & 0x7;
  65         div++;
  66         clk->rate = clk->parent->rate / div;
  67 }
  68
  69 static int omap1_clk_enable_dsp_domain(struct clk *clk)
  70 {
  71         int retval;
  72
  73         retval = omap1_clk_enable(&api_ck.clk);
  74         if (!retval) {
  75                 retval = omap1_clk_enable_generic(clk);
  76                 omap1_clk_disable(&api_ck.clk);
  77         }
  78
  79         return retval;
  80 }
  81
  82 static void omap1_clk_disable_dsp_domain(struct clk *clk)
  83 {
  84         if (omap1_clk_enable(&api_ck.clk) == 0) {
  85                 omap1_clk_disable_generic(clk);
  86                 omap1_clk_disable(&api_ck.clk);
  87         }
  88 }
  89
  90 static const struct clkops clkops_dspck = {
  91         .enable         = &omap1_clk_enable_dsp_domain,
  92         .disable        = &omap1_clk_disable_dsp_domain,
  93 };
  94
  95 static int omap1_clk_enable_uart_functional(struct clk *clk)
  96 {
  97         int ret;
  98         struct uart_clk *uclk;
  99
 100         ret = omap1_clk_enable_generic(clk);
 101         if (ret == 0) {
 102                 /* Set smart idle acknowledgement mode */
 103                 uclk = (struct uart_clk *)clk;
 104                 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x10) | 8,
 105                             uclk->sysc_addr);
 106         }
 107
 108         return ret;
 109 }
 110
 111 static void omap1_clk_disable_uart_functional(struct clk *clk)
 112 {
 113         struct uart_clk *uclk;
 114
 115         /* Set force idle acknowledgement mode */
 116         uclk = (struct uart_clk *)clk;
 117         omap_writeb((omap_readb(uclk->sysc_addr) & ~0x18), uclk->sysc_addr);
 118
 119         omap1_clk_disable_generic(clk);
 120 }
 121
 122 static const struct clkops clkops_uart = {
 123         .enable         = &omap1_clk_enable_uart_functional,
 124         .disable        = &omap1_clk_disable_uart_functional,
 125 };
 126
 127 static void omap1_clk_allow_idle(struct clk *clk)
 128 {
 129         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 130
 131         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 132                 return;
 133
 134         if (iclk->no_idle_count > 0 && !(--iclk->no_idle_count))
 135                 arm_idlect1_mask |= 1 << iclk->idlect_shift;
 136 }
 137
 138 static void omap1_clk_deny_idle(struct clk *clk)
 139 {
 140         struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
 141
 142         if (!(clk->flags & CLOCK_IDLE_CONTROL))
 143                 return;
 144
 145         if (iclk->no_idle_count++ == 0)
 146                 arm_idlect1_mask &= ~(1 << iclk->idlect_shift);
 147 }
 148
 149 static __u16 verify_ckctl_value(__u16 newval)
 150 {
 151         /* This function checks for following limitations set
 152          * by the hardware (all conditions must be true):
 153          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 154          * ARM_CK >= TC_CK
 155          * DSP_CK >= TC_CK
 156          * DSPMMU_CK >= TC_CK
 157          *
 158          * In addition following rules are enforced:
 159          * LCD_CK <= TC_CK
 160          * ARMPER_CK <= TC_CK
 161          *
 162          * However, maximum frequencies are not checked for!
 163          */
 164         __u8 per_exp;
 165         __u8 lcd_exp;
 166         __u8 arm_exp;
 167         __u8 dsp_exp;
 168         __u8 tc_exp;
 169         __u8 dspmmu_exp;
 170
 171         per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
 172         lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
 173         arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
 174         dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
 175         tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
 176         dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
 177
 178         if (dspmmu_exp < dsp_exp)
 179                 dspmmu_exp = dsp_exp;
 180         if (dspmmu_exp > dsp_exp+1)
 181                 dspmmu_exp = dsp_exp+1;
 182         if (tc_exp < arm_exp)
 183                 tc_exp = arm_exp;
 184         if (tc_exp < dspmmu_exp)
 185                 tc_exp = dspmmu_exp;
 186         if (tc_exp > lcd_exp)
 187                 lcd_exp = tc_exp;
 188         if (tc_exp > per_exp)
 189                 per_exp = tc_exp;
 190
 191         newval &= 0xf000;
 192         newval |= per_exp << CKCTL_PERDIV_OFFSET;
 193         newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
 194         newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
 195         newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
 196         newval |= tc_exp << CKCTL_TCDIV_OFFSET;
 197         newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
 198
 199         return newval;
 200 }
 201
 202 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
 203 {
 204         /* Note: If target frequency is too low, this function will return 4,
 205          * which is invalid value. Caller must check for this value and act
 206          * accordingly.
 207          *
 208          * Note: This function does not check for following limitations set
 209          * by the hardware (all conditions must be true):
 210          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 211          * ARM_CK >= TC_CK
 212          * DSP_CK >= TC_CK
 213          * DSPMMU_CK >= TC_CK
 214          */
 215         unsigned long realrate;
 216         struct clk * parent;
 217         unsigned  dsor_exp;
 218
 219         if (unlikely(!(clk->flags & RATE_CKCTL)))
 220                 return -EINVAL;
 221
 222         parent = clk->parent;
 223         if (unlikely(parent == NULL))
 224                 return -EIO;
 225
 226         realrate = parent->rate;
 227         for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
 228                 if (realrate <= rate)
 229                         break;
 230
 231                 realrate /= 2;
 232         }
 233
 234         return dsor_exp;
 235 }
 236
 237 static void omap1_ckctl_recalc(struct clk * clk)
 238 {
 239         int dsor;
 240
 241         /* Calculate divisor encoded as 2-bit exponent */
 242         dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
 243
 244         if (unlikely(clk->rate == clk->parent->rate / dsor))
 245                 return; /* No change, quick exit */
 246         clk->rate = clk->parent->rate / dsor;
 247
 248         if (unlikely(clk->flags & RATE_PROPAGATES))
 249                 propagate_rate(clk);
 250 }
 251
 252 static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
 253 {
 254         int dsor;
 255
 256         /* Calculate divisor encoded as 2-bit exponent
 257          *
 258          * The clock control bits are in DSP domain,
 259          * so api_ck is needed for access.
 260          * Note that DSP_CKCTL virt addr = phys addr, so
 261          * we must use __raw_readw() instead of omap_readw().
 262          */
 263         omap1_clk_enable(&api_ck.clk);
 264         dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
 265         omap1_clk_disable(&api_ck.clk);
 266
 267         if (unlikely(clk->rate == clk->parent->rate / dsor))
 268                 return; /* No change, quick exit */
 269         clk->rate = clk->parent->rate / dsor;
 270
 271         if (unlikely(clk->flags & RATE_PROPAGATES))
 272                 propagate_rate(clk);
 273 }
 274
 275 /* MPU virtual clock functions */
 276 static int omap1_select_table_rate(struct clk * clk, unsigned long rate)
 277 {
 278         /* Find the highest supported frequency <= rate and switch to it */
 279         struct mpu_rate * ptr;
 280
 281         if (clk != &virtual_ck_mpu)
 282                 return -EINVAL;
 283
 284         for (ptr = rate_table; ptr->rate; ptr++) {
 285                 if (ptr->xtal != ck_ref.rate)
 286                         continue;
 287
 288                 /* DPLL1 cannot be reprogrammed without risking system crash */
 289                 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
 290                         continue;
 291
 292                 /* Can check only after xtal frequency check */
 293                 if (ptr->rate <= rate)
 294                         break;
 295         }
 296
 297         if (!ptr->rate)
 298                 return -EINVAL;
 299
 300         /*
 301          * In most cases we should not need to reprogram DPLL.
 302          * Reprogramming the DPLL is tricky, it must be done from SRAM.
 303          * (on 730, bit 13 must always be 1)
 304          */
 305         if (cpu_is_omap730())
 306                 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val | 0x2000);
 307         else
 308                 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
 309
 310         ck_dpll1.rate = ptr->pll_rate;
 311         propagate_rate(&ck_dpll1);
 312         return 0;
 313 }
 314
 315 static int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate)
 316 {
 317         int  ret = -EINVAL;
 318         int  dsor_exp;
 319         __u16  regval;
 320
 321         if (clk->flags & RATE_CKCTL) {
 322                 dsor_exp = calc_dsor_exp(clk, rate);
 323                 if (dsor_exp > 3)
 324                         dsor_exp = -EINVAL;
 325                 if (dsor_exp < 0)
 326                         return dsor_exp;
 327
 328                 regval = __raw_readw(DSP_CKCTL);
 329                 regval &= ~(3 << clk->rate_offset);
 330                 regval |= dsor_exp << clk->rate_offset;
 331                 __raw_writew(regval, DSP_CKCTL);
 332                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 333                 ret = 0;
 334         }
 335
 336         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 337                 propagate_rate(clk);
 338
 339         return ret;
 340 }
 341
 342 static long omap1_round_to_table_rate(struct clk * clk, unsigned long rate)
 343 {
 344         /* Find the highest supported frequency <= rate */
 345         struct mpu_rate * ptr;
 346         long  highest_rate;
 347
 348         if (clk != &virtual_ck_mpu)
 349                 return -EINVAL;
 350
 351         highest_rate = -EINVAL;
 352
 353         for (ptr = rate_table; ptr->rate; ptr++) {
 354                 if (ptr->xtal != ck_ref.rate)
 355                         continue;
 356
 357                 highest_rate = ptr->rate;
 358
 359                 /* Can check only after xtal frequency check */
 360                 if (ptr->rate <= rate)
 361                         break;
 362         }
 363
 364         return highest_rate;
 365 }
 366
 367 static unsigned calc_ext_dsor(unsigned long rate)
 368 {
 369         unsigned dsor;
 370
 371         /* MCLK and BCLK divisor selection is not linear:
 372          * freq = 96MHz / dsor
 373          *
 374          * RATIO_SEL range: dsor <-> RATIO_SEL
 375          * 0..6: (RATIO_SEL+2) <-> (dsor-2)
 376          * 6..48:  (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
 377          * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
 378          * can not be used.
 379          */
 380         for (dsor = 2; dsor < 96; ++dsor) {
 381                 if ((dsor & 1) && dsor > 8)
 382                         continue;
 383                 if (rate >= 96000000 / dsor)
 384                         break;
 385         }
 386         return dsor;
 387 }
 388
 389 /* Only needed on 1510 */
 390 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate)
 391 {
 392         unsigned int val;
 393
 394         val = omap_readl(clk->enable_reg);
 395         if (rate == 12000000)
 396                 val &= ~(1 << clk->enable_bit);
 397         else if (rate == 48000000)
 398                 val |= (1 << clk->enable_bit);
 399         else
 400                 return -EINVAL;
 401         omap_writel(val, clk->enable_reg);
 402         clk->rate = rate;
 403
 404         return 0;
 405 }
 406
 407 /* External clock (MCLK & BCLK) functions */
 408 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate)
 409 {
 410         unsigned dsor;
 411         __u16 ratio_bits;
 412
 413         dsor = calc_ext_dsor(rate);
 414         clk->rate = 96000000 / dsor;
 415         if (dsor > 8)
 416                 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
 417         else
 418                 ratio_bits = (dsor - 2) << 2;
 419
 420         ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
 421         omap_writew(ratio_bits, clk->enable_reg);
 422
 423         return 0;
 424 }
 425
 426 static int omap1_set_sossi_rate(struct clk *clk, unsigned long rate)
 427 {
 428         u32 l;
 429         int div;
 430         unsigned long p_rate;
 431
 432         p_rate = clk->parent->rate;
 433         /* Round towards slower frequency */
 434         div = (p_rate + rate - 1) / rate;
 435         div--;
 436         if (div < 0 || div > 7)
 437                 return -EINVAL;
 438
 439         l = omap_readl(MOD_CONF_CTRL_1);
 440         l &= ~(7 << 17);
 441         l |= div << 17;
 442         omap_writel(l, MOD_CONF_CTRL_1);
 443
 444         clk->rate = p_rate / (div + 1);
 445         if (unlikely(clk->flags & RATE_PROPAGATES))
 446                 propagate_rate(clk);
 447
 448         return 0;
 449 }
 450
 451 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate)
 452 {
 453         return 96000000 / calc_ext_dsor(rate);
 454 }
 455
 456 static void omap1_init_ext_clk(struct clk * clk)
 457 {
 458         unsigned dsor;
 459         __u16 ratio_bits;
 460
 461         /* Determine current rate and ensure clock is based on 96MHz APLL */
 462         ratio_bits = omap_readw(clk->enable_reg) & ~1;
 463         omap_writew(ratio_bits, clk->enable_reg);
 464
 465         ratio_bits = (ratio_bits & 0xfc) >> 2;
 466         if (ratio_bits > 6)
 467                 dsor = (ratio_bits - 6) * 2 + 8;
 468         else
 469                 dsor = ratio_bits + 2;
 470
 471         clk-> rate = 96000000 / dsor;
 472 }
 473
 474 static int omap1_clk_enable(struct clk *clk)
 475 {
 476         int ret = 0;
 477         if (clk->usecount++ == 0) {
 478                 if (likely(clk->parent)) {
 479                         ret = omap1_clk_enable(clk->parent);
 480
 481                         if (unlikely(ret != 0)) {
 482                                 clk->usecount--;
 483                                 return ret;
 484                         }
 485
 486                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 487                                 omap1_clk_deny_idle(clk->parent);
 488                 }
 489
 490                 ret = clk->ops->enable(clk);
 491
 492                 if (unlikely(ret != 0) && clk->parent) {
 493                         omap1_clk_disable(clk->parent);
 494                         clk->usecount--;
 495                 }
 496         }
 497
 498         return ret;
 499 }
 500
 501 static void omap1_clk_disable(struct clk *clk)
 502 {
 503         if (clk->usecount > 0 && !(--clk->usecount)) {
 504                 clk->ops->disable(clk);
 505                 if (likely(clk->parent)) {
 506                         omap1_clk_disable(clk->parent);
 507                         if (clk->flags & CLOCK_NO_IDLE_PARENT)
 508                                 omap1_clk_allow_idle(clk->parent);
 509                 }
 510         }
 511 }
 512
 513 static int omap1_clk_enable_generic(struct clk *clk)
 514 {
 515         __u16 regval16;
 516         __u32 regval32;
 517
 518         if (unlikely(clk->enable_reg == NULL)) {
 519                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 520                        clk->name);
 521                 return -EINVAL;
 522         }
 523
 524         if (clk->flags & ENABLE_REG_32BIT) {
 525                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 526                         regval32 = __raw_readl(clk->enable_reg);
 527                         regval32 |= (1 << clk->enable_bit);
 528                         __raw_writel(regval32, clk->enable_reg);
 529                 } else {
 530                         regval32 = omap_readl(clk->enable_reg);
 531                         regval32 |= (1 << clk->enable_bit);
 532                         omap_writel(regval32, clk->enable_reg);
 533                 }
 534         } else {
 535                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 536                         regval16 = __raw_readw(clk->enable_reg);
 537                         regval16 |= (1 << clk->enable_bit);
 538                         __raw_writew(regval16, clk->enable_reg);
 539                 } else {
 540                         regval16 = omap_readw(clk->enable_reg);
 541                         regval16 |= (1 << clk->enable_bit);
 542                         omap_writew(regval16, clk->enable_reg);
 543                 }
 544         }
 545
 546         return 0;
 547 }
 548
 549 static void omap1_clk_disable_generic(struct clk *clk)
 550 {
 551         __u16 regval16;
 552         __u32 regval32;
 553
 554         if (clk->enable_reg == NULL)
 555                 return;
 556
 557         if (clk->flags & ENABLE_REG_32BIT) {
 558                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 559                         regval32 = __raw_readl(clk->enable_reg);
 560                         regval32 &= ~(1 << clk->enable_bit);
 561                         __raw_writel(regval32, clk->enable_reg);
 562                 } else {
 563                         regval32 = omap_readl(clk->enable_reg);
 564                         regval32 &= ~(1 << clk->enable_bit);
 565                         omap_writel(regval32, clk->enable_reg);
 566                 }
 567         } else {
 568                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 569                         regval16 = __raw_readw(clk->enable_reg);
 570                         regval16 &= ~(1 << clk->enable_bit);
 571                         __raw_writew(regval16, clk->enable_reg);
 572                 } else {
 573                         regval16 = omap_readw(clk->enable_reg);
 574                         regval16 &= ~(1 << clk->enable_bit);
 575                         omap_writew(regval16, clk->enable_reg);
 576                 }
 577         }
 578 }
 579
 580 static const struct clkops clkops_generic = {
 581         .enable         = &omap1_clk_enable_generic,
 582         .disable        = &omap1_clk_disable_generic,
 583 };
 584
 585 static long omap1_clk_round_rate(struct clk *clk, unsigned long rate)
 586 {
 587         int dsor_exp;
 588
 589         if (clk->flags & RATE_FIXED)
 590                 return clk->rate;
 591
 592         if (clk->flags & RATE_CKCTL) {
 593                 dsor_exp = calc_dsor_exp(clk, rate);
 594                 if (dsor_exp < 0)
 595                         return dsor_exp;
 596                 if (dsor_exp > 3)
 597                         dsor_exp = 3;
 598                 return clk->parent->rate / (1 << dsor_exp);
 599         }
 600
 601         if (clk->round_rate != NULL)
 602                 return clk->round_rate(clk, rate);
 603
 604         return clk->rate;
 605 }
 606
 607 static int omap1_clk_set_rate(struct clk *clk, unsigned long rate)
 608 {
 609         int  ret = -EINVAL;
 610         int  dsor_exp;
 611         __u16  regval;
 612
 613         if (clk->set_rate)
 614                 ret = clk->set_rate(clk, rate);
 615         else if (clk->flags & RATE_CKCTL) {
 616                 dsor_exp = calc_dsor_exp(clk, rate);
 617                 if (dsor_exp > 3)
 618                         dsor_exp = -EINVAL;
 619                 if (dsor_exp < 0)
 620                         return dsor_exp;
 621
 622                 regval = omap_readw(ARM_CKCTL);
 623                 regval &= ~(3 << clk->rate_offset);
 624                 regval |= dsor_exp << clk->rate_offset;
 625                 regval = verify_ckctl_value(regval);
 626                 omap_writew(regval, ARM_CKCTL);
 627                 clk->rate = clk->parent->rate / (1 << dsor_exp);
 628                 ret = 0;
 629         }
 630
 631         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
 632                 propagate_rate(clk);
 633
 634         return ret;
 635 }
 636
 637 /*-------------------------------------------------------------------------
 638  * Omap1 clock reset and init functions
 639  *-------------------------------------------------------------------------*/
 640
 641 #ifdef CONFIG_OMAP_RESET_CLOCKS
 642
 643 static void __init omap1_clk_disable_unused(struct clk *clk)
 644 {
 645         __u32 regval32;
 646
 647         /* Clocks in the DSP domain need api_ck. Just assume bootloader
 648          * has not enabled any DSP clocks */
 649         if (clk->enable_reg == DSP_IDLECT2) {
 650                 printk(KERN_INFO "Skipping reset check for DSP domain "
 651                        "clock \"%s\"\n", clk->name);
 652                 return;
 653         }
 654
 655         /* Is the clock already disabled? */
 656         if (clk->flags & ENABLE_REG_32BIT) {
 657                 if (clk->flags & VIRTUAL_IO_ADDRESS)
 658                         regval32 = __raw_readl(clk->enable_reg);
 659                         else
 660                                 regval32 = omap_readl(clk->enable_reg);
 661         } else {
 662                 if (clk->flags & VIRTUAL_IO_ADDRESS)
 663                         regval32 = __raw_readw(clk->enable_reg);
 664                 else
 665                         regval32 = omap_readw(clk->enable_reg);
 666         }
 667
 668         if ((regval32 & (1 << clk->enable_bit)) == 0)
 669                 return;
 670
 671         /* FIXME: This clock seems to be necessary but no-one
 672          * has asked for its activation. */
 673         if (clk == &tc2_ck              /* FIX: pm.c (SRAM), CCP, Camera */
 674             || clk == &ck_dpll1out.clk  /* FIX: SoSSI, SSR */
 675             || clk == &arm_gpio_ck      /* FIX: GPIO code for 1510 */
 676                 ) {
 677                 printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
 678                        clk->name);
 679                 return;
 680         }
 681
 682         printk(KERN_INFO "Disabling unused clock \"%s\"... ", clk->name);
 683         clk->ops->disable(clk);
 684         printk(" done\n");
 685 }
 686
 687 #else
 688 #define omap1_clk_disable_unused        NULL
 689 #endif
 690
 691 static struct clk_functions omap1_clk_functions = {
 692         .clk_enable             = omap1_clk_enable,
 693         .clk_disable            = omap1_clk_disable,
 694         .clk_round_rate         = omap1_clk_round_rate,
 695         .clk_set_rate           = omap1_clk_set_rate,
 696         .clk_disable_unused     = omap1_clk_disable_unused,
 697 };
 698
 699 int __init omap1_clk_init(void)
 700 {
 701         struct clk ** clkp;
 702         const struct omap_clock_config *info;
 703         int crystal_type = 0; /* Default 12 MHz */
 704         u32 reg;
 705
 706 #ifdef CONFIG_DEBUG_LL
 707         /* Resets some clocks that may be left on from bootloader,
 708          * but leaves serial clocks on.
 709          */
 710         omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
 711 #endif
 712
 713         /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
 714         reg = omap_readw(SOFT_REQ_REG) & (1 << 4);
 715         omap_writew(reg, SOFT_REQ_REG);
 716         if (!cpu_is_omap15xx())
 717                 omap_writew(0, SOFT_REQ_REG2);
 718
 719         clk_init(&omap1_clk_functions);
 720
 721         /* By default all idlect1 clocks are allowed to idle */
 722         arm_idlect1_mask = ~0;
 723
 724         for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
 725                 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
 726                         clk_register(*clkp);
 727                         continue;
 728                 }
 729
 730                 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
 731                         clk_register(*clkp);
 732                         continue;
 733                 }
 734
 735                 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
 736                         clk_register(*clkp);
 737                         continue;
 738                 }
 739
 740                 if (((*clkp)->flags &CLOCK_IN_OMAP310) && cpu_is_omap310()) {
 741                         clk_register(*clkp);
 742                         continue;
 743                 }
 744         }
 745
 746         info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
 747         if (info != NULL) {
 748                 if (!cpu_is_omap15xx())
 749                         crystal_type = info->system_clock_type;
 750         }
 751
 752 #if defined(CONFIG_ARCH_OMAP730)
 753         ck_ref.rate = 13000000;
 754 #elif defined(CONFIG_ARCH_OMAP16XX)
 755         if (crystal_type == 2)
 756                 ck_ref.rate = 19200000;
 757 #endif
 758
 759         printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
 760                omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
 761                omap_readw(ARM_CKCTL));
 762
 763         /* We want to be in syncronous scalable mode */
 764         omap_writew(0x1000, ARM_SYSST);
 765
 766 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
 767         /* Use values set by bootloader. Determine PLL rate and recalculate
 768          * dependent clocks as if kernel had changed PLL or divisors.
 769          */
 770         {
 771                 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
 772
 773                 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
 774                 if (pll_ctl_val & 0x10) {
 775                         /* PLL enabled, apply multiplier and divisor */
 776                         if (pll_ctl_val & 0xf80)
 777                                 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
 778                         ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
 779                 } else {
 780                         /* PLL disabled, apply bypass divisor */
 781                         switch (pll_ctl_val & 0xc) {
 782                         case 0:
 783                                 break;
 784                         case 0x4:
 785                                 ck_dpll1.rate /= 2;
 786                                 break;
 787                         default:
 788                                 ck_dpll1.rate /= 4;
 789                                 break;
 790                         }
 791                 }
 792         }
 793         propagate_rate(&ck_dpll1);
 794 #else
 795         /* Find the highest supported frequency and enable it */
 796         if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
 797                 printk(KERN_ERR "System frequencies not set. Check your config.\n");
 798                 /* Guess sane values (60MHz) */
 799                 omap_writew(0x2290, DPLL_CTL);
 800                 omap_writew(cpu_is_omap730() ? 0x3005 : 0x1005, ARM_CKCTL);
 801                 ck_dpll1.rate = 60000000;
 802                 propagate_rate(&ck_dpll1);
 803         }
 804 #endif
 805         /* Cache rates for clocks connected to ck_ref (not dpll1) */
 806         propagate_rate(&ck_ref);
 807         printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
 808                 "%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
 809                ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
 810                ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
 811                arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
 812
 813 #if defined(CONFIG_MACH_OMAP_PERSEUS2) || defined(CONFIG_MACH_OMAP_FSAMPLE)
 814         /* Select slicer output as OMAP input clock */
 815         omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
 816 #endif
 817
 818         /* Amstrad Delta wants BCLK high when inactive */
 819         if (machine_is_ams_delta())
 820                 omap_writel(omap_readl(ULPD_CLOCK_CTRL) |
 821                                 (1 << SDW_MCLK_INV_BIT),
 822                                 ULPD_CLOCK_CTRL);
 823
 824         /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
 825         /* (on 730, bit 13 must not be cleared) */
 826         if (cpu_is_omap730())
 827                 omap_writew(omap_readw(ARM_CKCTL) & 0x2fff, ARM_CKCTL);
 828         else
 829                 omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
 830
 831         /* Put DSP/MPUI into reset until needed */
 832         omap_writew(0, ARM_RSTCT1);
 833         omap_writew(1, ARM_RSTCT2);
 834         omap_writew(0x400, ARM_IDLECT1);
 835
 836         /*
 837          * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
 838          * of the ARM_IDLECT2 register must be set to zero. The power-on
 839          * default value of this bit is one.
 840          */
 841         omap_writew(0x0000, ARM_IDLECT2);       /* Turn LCD clock off also */
 842
 843         /*
 844          * Only enable those clocks we will need, let the drivers
 845          * enable other clocks as necessary
 846          */
 847         clk_enable(&armper_ck.clk);
 848         clk_enable(&armxor_ck.clk);
 849         clk_enable(&armtim_ck.clk); /* This should be done by timer code */
 850
 851         if (cpu_is_omap15xx())
 852                 clk_enable(&arm_gpio_ck);
 853
 854         return 0;
 855 }
 856