git.oblomov.eu Git - linux-2.6/blob - arch/arm/mach-pnx4008/clock.c

   1 /*
   2  * arch/arm/mach-pnx4008/clock.c
   3  *
   4  * Clock control driver for PNX4008
   5  *
   6  * Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
   7  * Generic clock management functions are partially based on:
   8  *  linux/arch/arm/mach-omap/clock.c
   9  *
  10  * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
  11  * the terms of the GNU General Public License version 2. This program
  12  * is licensed "as is" without any warranty of any kind, whether express
  13  * or implied.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/list.h>
  19 #include <linux/errno.h>
  20 #include <linux/device.h>
  21 #include <linux/err.h>
  22 #include <linux/delay.h>
  23 #include <linux/io.h>
  24
  25 #include <mach/hardware.h>
  26
  27 #include <mach/clock.h>
  28 #include "clock.h"
  29
  30 /*forward declaration*/
  31 static struct clk per_ck;
  32 static struct clk hclk_ck;
  33 static struct clk ck_1MHz;
  34 static struct clk ck_13MHz;
  35 static struct clk ck_pll1;
  36 static int local_set_rate(struct clk *clk, u32 rate);
  37
  38 static inline void clock_lock(void)
  39 {
  40         local_irq_disable();
  41 }
  42
  43 static inline void clock_unlock(void)
  44 {
  45         local_irq_enable();
  46 }
  47
  48 static void propagate_rate(struct clk *clk)
  49 {
  50         struct clk *tmp_clk;
  51
  52         tmp_clk = clk;
  53         while (tmp_clk->propagate_next) {
  54                 tmp_clk = tmp_clk->propagate_next;
  55                 local_set_rate(tmp_clk, tmp_clk->user_rate);
  56         }
  57 }
  58
  59 static inline void clk_reg_disable(struct clk *clk)
  60 {
  61         if (clk->enable_reg)
  62                 __raw_writel(__raw_readl(clk->enable_reg) &
  63                              ~(1 << clk->enable_shift), clk->enable_reg);
  64 }
  65
  66 static inline void clk_reg_enable(struct clk *clk)
  67 {
  68         if (clk->enable_reg)
  69                 __raw_writel(__raw_readl(clk->enable_reg) |
  70                              (1 << clk->enable_shift), clk->enable_reg);
  71 }
  72
  73 static inline void clk_reg_disable1(struct clk *clk)
  74 {
  75         if (clk->enable_reg1)
  76                 __raw_writel(__raw_readl(clk->enable_reg1) &
  77                              ~(1 << clk->enable_shift1), clk->enable_reg1);
  78 }
  79
  80 static inline void clk_reg_enable1(struct clk *clk)
  81 {
  82         if (clk->enable_reg1)
  83                 __raw_writel(__raw_readl(clk->enable_reg1) |
  84                              (1 << clk->enable_shift1), clk->enable_reg1);
  85 }
  86
  87 static int clk_wait_for_pll_lock(struct clk *clk)
  88 {
  89         int i;
  90         i = 0;
  91         while (i++ < 0xFFF && !(__raw_readl(clk->scale_reg) & 1)) ;     /*wait for PLL to lock */
  92
  93         if (!(__raw_readl(clk->scale_reg) & 1)) {
  94                 printk(KERN_ERR
  95                        "%s ERROR: failed to lock, scale reg data: %x\n",
  96                        clk->name, __raw_readl(clk->scale_reg));
  97                 return -1;
  98         }
  99         return 0;
 100 }
 101
 102 static int switch_to_dirty_13mhz(struct clk *clk)
 103 {
 104         int i;
 105         int ret;
 106         u32 tmp_reg;
 107
 108         ret = 0;
 109
 110         if (!clk->rate)
 111                 clk_reg_enable1(clk);
 112
 113         tmp_reg = __raw_readl(clk->parent_switch_reg);
 114         /*if 13Mhz clock selected, select 13'MHz (dirty) source from OSC */
 115         if (!(tmp_reg & 1)) {
 116                 tmp_reg |= (1 << 1);    /* Trigger switch to 13'MHz (dirty) clock */
 117                 __raw_writel(tmp_reg, clk->parent_switch_reg);
 118                 i = 0;
 119                 while (i++ < 0xFFF && !(__raw_readl(clk->parent_switch_reg) & 1)) ;     /*wait for 13'MHz selection status */
 120
 121                 if (!(__raw_readl(clk->parent_switch_reg) & 1)) {
 122                         printk(KERN_ERR
 123                                "%s ERROR: failed to select 13'MHz, parent sw reg data: %x\n",
 124                                clk->name, __raw_readl(clk->parent_switch_reg));
 125                         ret = -1;
 126                 }
 127         }
 128
 129         if (!clk->rate)
 130                 clk_reg_disable1(clk);
 131
 132         return ret;
 133 }
 134
 135 static int switch_to_clean_13mhz(struct clk *clk)
 136 {
 137         int i;
 138         int ret;
 139         u32 tmp_reg;
 140
 141         ret = 0;
 142
 143         if (!clk->rate)
 144                 clk_reg_enable1(clk);
 145
 146         tmp_reg = __raw_readl(clk->parent_switch_reg);
 147         /*if 13'Mhz clock selected, select 13MHz (clean) source from OSC */
 148         if (tmp_reg & 1) {
 149                 tmp_reg &= ~(1 << 1);   /* Trigger switch to 13MHz (clean) clock */
 150                 __raw_writel(tmp_reg, clk->parent_switch_reg);
 151                 i = 0;
 152                 while (i++ < 0xFFF && (__raw_readl(clk->parent_switch_reg) & 1)) ;      /*wait for 13MHz selection status */
 153
 154                 if (__raw_readl(clk->parent_switch_reg) & 1) {
 155                         printk(KERN_ERR
 156                                "%s ERROR: failed to select 13MHz, parent sw reg data: %x\n",
 157                                clk->name, __raw_readl(clk->parent_switch_reg));
 158                         ret = -1;
 159                 }
 160         }
 161
 162         if (!clk->rate)
 163                 clk_reg_disable1(clk);
 164
 165         return ret;
 166 }
 167
 168 static int set_13MHz_parent(struct clk *clk, struct clk *parent)
 169 {
 170         int ret = -EINVAL;
 171
 172         if (parent == &ck_13MHz)
 173                 ret = switch_to_clean_13mhz(clk);
 174         else if (parent == &ck_pll1)
 175                 ret = switch_to_dirty_13mhz(clk);
 176
 177         return ret;
 178 }
 179
 180 #define PLL160_MIN_FCCO 156000
 181 #define PLL160_MAX_FCCO 320000
 182
 183 /*
 184  * Calculate pll160 settings.
 185  * Possible input: up to 320MHz with step of clk->parent->rate.
 186  * In PNX4008 parent rate for pll160s may be either 1 or 13MHz.
 187  * Ignored paths: "feedback" (bit 13 set), "div-by-N".
 188  * Setting ARM PLL4 rate to 0 will put CPU into direct run mode.
 189  * Setting PLL5 and PLL3 rate to 0 will disable USB and DSP clock input.
 190  * Please refer to PNX4008 IC manual for details.
 191  */
 192
 193 static int pll160_set_rate(struct clk *clk, u32 rate)
 194 {
 195         u32 tmp_reg, tmp_m, tmp_2p, i;
 196         u32 parent_rate;
 197         int ret = -EINVAL;
 198
 199         parent_rate = clk->parent->rate;
 200
 201         if (!parent_rate)
 202                 goto out;
 203
 204         /* set direct run for ARM or disable output for others  */
 205         clk_reg_disable(clk);
 206
 207         /* disable source input as well (ignored for ARM) */
 208         clk_reg_disable1(clk);
 209
 210         tmp_reg = __raw_readl(clk->scale_reg);
 211         tmp_reg &= ~0x1ffff;    /*clear all settings, power down */
 212         __raw_writel(tmp_reg, clk->scale_reg);
 213
 214         rate -= rate % parent_rate;     /*round down the input */
 215
 216         if (rate > PLL160_MAX_FCCO)
 217                 rate = PLL160_MAX_FCCO;
 218
 219         if (!rate) {
 220                 clk->rate = 0;
 221                 ret = 0;
 222                 goto out;
 223         }
 224
 225         clk_reg_enable1(clk);
 226         tmp_reg = __raw_readl(clk->scale_reg);
 227
 228         if (rate == parent_rate) {
 229                 /*enter direct bypass mode */
 230                 tmp_reg |= ((1 << 14) | (1 << 15));
 231                 __raw_writel(tmp_reg, clk->scale_reg);
 232                 clk->rate = parent_rate;
 233                 clk_reg_enable(clk);
 234                 ret = 0;
 235                 goto out;
 236         }
 237
 238         i = 0;
 239         for (tmp_2p = 1; tmp_2p < 16; tmp_2p <<= 1) {
 240                 if (rate * tmp_2p >= PLL160_MIN_FCCO)
 241                         break;
 242                 i++;
 243         }
 244
 245         if (tmp_2p > 1)
 246                 tmp_reg |= ((i - 1) << 11);
 247         else
 248                 tmp_reg |= (1 << 14);   /*direct mode, no divide */
 249
 250         tmp_m = rate * tmp_2p;
 251         tmp_m /= parent_rate;
 252
 253         tmp_reg |= (tmp_m - 1) << 1;    /*calculate M */
 254         tmp_reg |= (1 << 16);   /*power up PLL */
 255         __raw_writel(tmp_reg, clk->scale_reg);
 256
 257         if (clk_wait_for_pll_lock(clk) < 0) {
 258                 clk_reg_disable(clk);
 259                 clk_reg_disable1(clk);
 260
 261                 tmp_reg = __raw_readl(clk->scale_reg);
 262                 tmp_reg &= ~0x1ffff;    /*clear all settings, power down */
 263                 __raw_writel(tmp_reg, clk->scale_reg);
 264                 clk->rate = 0;
 265                 ret = -EFAULT;
 266                 goto out;
 267         }
 268
 269         clk->rate = (tmp_m * parent_rate) / tmp_2p;
 270
 271         if (clk->flags & RATE_PROPAGATES)
 272                 propagate_rate(clk);
 273
 274         clk_reg_enable(clk);
 275         ret = 0;
 276
 277 out:
 278         return ret;
 279 }
 280
 281 /*configure PER_CLK*/
 282 static int per_clk_set_rate(struct clk *clk, u32 rate)
 283 {
 284         u32 tmp;
 285
 286         tmp = __raw_readl(clk->scale_reg);
 287         tmp &= ~(0x1f << 2);
 288         tmp |= ((clk->parent->rate / clk->rate) - 1) << 2;
 289         __raw_writel(tmp, clk->scale_reg);
 290         clk->rate = rate;
 291         return 0;
 292 }
 293
 294 /*configure HCLK*/
 295 static int hclk_set_rate(struct clk *clk, u32 rate)
 296 {
 297         u32 tmp;
 298         tmp = __raw_readl(clk->scale_reg);
 299         tmp = tmp & ~0x3;
 300         switch (rate) {
 301         case 1:
 302                 break;
 303         case 2:
 304                 tmp |= 1;
 305                 break;
 306         case 4:
 307                 tmp |= 2;
 308                 break;
 309         }
 310
 311         __raw_writel(tmp, clk->scale_reg);
 312         clk->rate = rate;
 313         return 0;
 314 }
 315
 316 static u32 hclk_round_rate(struct clk *clk, u32 rate)
 317 {
 318         switch (rate) {
 319         case 1:
 320         case 4:
 321                 return rate;
 322         }
 323         return 2;
 324 }
 325
 326 static u32 per_clk_round_rate(struct clk *clk, u32 rate)
 327 {
 328         return CLK_RATE_13MHZ;
 329 }
 330
 331 static int on_off_set_rate(struct clk *clk, u32 rate)
 332 {
 333         if (rate) {
 334                 clk_reg_enable(clk);
 335                 clk->rate = 1;
 336         } else {
 337                 clk_reg_disable(clk);
 338                 clk->rate = 0;
 339         }
 340         return 0;
 341 }
 342
 343 static int on_off_inv_set_rate(struct clk *clk, u32 rate)
 344 {
 345         if (rate) {
 346                 clk_reg_disable(clk);   /*enable bit is inverted */
 347                 clk->rate = 1;
 348         } else {
 349                 clk_reg_enable(clk);
 350                 clk->rate = 0;
 351         }
 352         return 0;
 353 }
 354
 355 static u32 on_off_round_rate(struct clk *clk, u32 rate)
 356 {
 357         return (rate ? 1 : 0);
 358 }
 359
 360 static u32 pll4_round_rate(struct clk *clk, u32 rate)
 361 {
 362         if (rate > CLK_RATE_208MHZ)
 363                 rate = CLK_RATE_208MHZ;
 364         if (rate == CLK_RATE_208MHZ && hclk_ck.user_rate == 1)
 365                 rate = CLK_RATE_208MHZ - CLK_RATE_13MHZ;
 366         return (rate - (rate % (hclk_ck.user_rate * CLK_RATE_13MHZ)));
 367 }
 368
 369 static u32 pll3_round_rate(struct clk *clk, u32 rate)
 370 {
 371         if (rate > CLK_RATE_208MHZ)
 372                 rate = CLK_RATE_208MHZ;
 373         return (rate - rate % CLK_RATE_13MHZ);
 374 }
 375
 376 static u32 pll5_round_rate(struct clk *clk, u32 rate)
 377 {
 378         return (rate ? CLK_RATE_48MHZ : 0);
 379 }
 380
 381 static u32 ck_13MHz_round_rate(struct clk *clk, u32 rate)
 382 {
 383         return (rate ? CLK_RATE_13MHZ : 0);
 384 }
 385
 386 static int ck_13MHz_set_rate(struct clk *clk, u32 rate)
 387 {
 388         if (rate) {
 389                 clk_reg_disable(clk);   /*enable bit is inverted */
 390                 udelay(500);
 391                 clk->rate = CLK_RATE_13MHZ;
 392                 ck_1MHz.rate = CLK_RATE_1MHZ;
 393         } else {
 394                 clk_reg_enable(clk);
 395                 clk->rate = 0;
 396                 ck_1MHz.rate = 0;
 397         }
 398         return 0;
 399 }
 400
 401 static int pll1_set_rate(struct clk *clk, u32 rate)
 402 {
 403 #if 0 /* doesn't work on some boards, probably a HW BUG */
 404         if (rate) {
 405                 clk_reg_disable(clk);   /*enable bit is inverted */
 406                 if (!clk_wait_for_pll_lock(clk)) {
 407                         clk->rate = CLK_RATE_13MHZ;
 408                 } else {
 409                         clk_reg_enable(clk);
 410                         clk->rate = 0;
 411                 }
 412
 413         } else {
 414                 clk_reg_enable(clk);
 415                 clk->rate = 0;
 416         }
 417 #endif
 418         return 0;
 419 }
 420
 421 /* Clock sources */
 422
 423 static struct clk osc_13MHz = {
 424         .name = "osc_13MHz",
 425         .flags = FIXED_RATE,
 426         .rate = CLK_RATE_13MHZ,
 427 };
 428
 429 static struct clk ck_13MHz = {
 430         .name = "ck_13MHz",
 431         .parent = &osc_13MHz,
 432         .flags = NEEDS_INITIALIZATION,
 433         .round_rate = &ck_13MHz_round_rate,
 434         .set_rate = &ck_13MHz_set_rate,
 435         .enable_reg = OSC13CTRL_REG,
 436         .enable_shift = 0,
 437         .rate = CLK_RATE_13MHZ,
 438 };
 439
 440 static struct clk osc_32KHz = {
 441         .name = "osc_32KHz",
 442         .flags = FIXED_RATE,
 443         .rate = CLK_RATE_32KHZ,
 444 };
 445
 446 /*attached to PLL5*/
 447 static struct clk ck_1MHz = {
 448         .name = "ck_1MHz",
 449         .flags = FIXED_RATE | PARENT_SET_RATE,
 450         .parent = &ck_13MHz,
 451 };
 452
 453 /* PLL1 (397) - provides 13' MHz clock */
 454 static struct clk ck_pll1 = {
 455         .name = "ck_pll1",
 456         .parent = &osc_32KHz,
 457         .flags = NEEDS_INITIALIZATION,
 458         .round_rate = &ck_13MHz_round_rate,
 459         .set_rate = &pll1_set_rate,
 460         .enable_reg = PLLCTRL_REG,
 461         .enable_shift = 1,
 462         .scale_reg = PLLCTRL_REG,
 463         .rate = CLK_RATE_13MHZ,
 464 };
 465
 466 /* CPU/Bus PLL */
 467 static struct clk ck_pll4 = {
 468         .name = "ck_pll4",
 469         .parent = &ck_pll1,
 470         .flags = RATE_PROPAGATES | NEEDS_INITIALIZATION,
 471         .propagate_next = &per_ck,
 472         .round_rate = &pll4_round_rate,
 473         .set_rate = &pll160_set_rate,
 474         .rate = CLK_RATE_208MHZ,
 475         .scale_reg = HCLKPLLCTRL_REG,
 476         .enable_reg = PWRCTRL_REG,
 477         .enable_shift = 2,
 478         .parent_switch_reg = SYSCLKCTRL_REG,
 479         .set_parent = &set_13MHz_parent,
 480 };
 481
 482 /* USB PLL */
 483 static struct clk ck_pll5 = {
 484         .name = "ck_pll5",
 485         .parent = &ck_1MHz,
 486         .flags = NEEDS_INITIALIZATION,
 487         .round_rate = &pll5_round_rate,
 488         .set_rate = &pll160_set_rate,
 489         .scale_reg = USBCTRL_REG,
 490         .enable_reg = USBCTRL_REG,
 491         .enable_shift = 18,
 492         .enable_reg1 = USBCTRL_REG,
 493         .enable_shift1 = 17,
 494 };
 495
 496 /* XPERTTeak DSP PLL */
 497 static struct clk ck_pll3 = {
 498         .name = "ck_pll3",
 499         .parent = &ck_pll1,
 500         .flags = NEEDS_INITIALIZATION,
 501         .round_rate = &pll3_round_rate,
 502         .set_rate = &pll160_set_rate,
 503         .scale_reg = DSPPLLCTRL_REG,
 504         .enable_reg = DSPCLKCTRL_REG,
 505         .enable_shift = 3,
 506         .enable_reg1 = DSPCLKCTRL_REG,
 507         .enable_shift1 = 2,
 508         .parent_switch_reg = DSPCLKCTRL_REG,
 509         .set_parent = &set_13MHz_parent,
 510 };
 511
 512 static struct clk hclk_ck = {
 513         .name = "hclk_ck",
 514         .parent = &ck_pll4,
 515         .flags = PARENT_SET_RATE,
 516         .set_rate = &hclk_set_rate,
 517         .round_rate = &hclk_round_rate,
 518         .scale_reg = HCLKDIVCTRL_REG,
 519         .rate = 2,
 520         .user_rate = 2,
 521 };
 522
 523 static struct clk per_ck = {
 524         .name = "per_ck",
 525         .parent = &ck_pll4,
 526         .flags = FIXED_RATE,
 527         .propagate_next = &hclk_ck,
 528         .set_rate = &per_clk_set_rate,
 529         .round_rate = &per_clk_round_rate,
 530         .scale_reg = HCLKDIVCTRL_REG,
 531         .rate = CLK_RATE_13MHZ,
 532         .user_rate = CLK_RATE_13MHZ,
 533 };
 534
 535 static struct clk m2hclk_ck = {
 536         .name = "m2hclk_ck",
 537         .parent = &hclk_ck,
 538         .flags = NEEDS_INITIALIZATION,
 539         .round_rate = &on_off_round_rate,
 540         .set_rate = &on_off_inv_set_rate,
 541         .rate = 1,
 542         .enable_shift = 6,
 543         .enable_reg = PWRCTRL_REG,
 544 };
 545
 546 static struct clk vfp9_ck = {
 547         .name = "vfp9_ck",
 548         .parent = &ck_pll4,
 549         .flags = NEEDS_INITIALIZATION,
 550         .round_rate = &on_off_round_rate,
 551         .set_rate = &on_off_set_rate,
 552         .rate = 1,
 553         .enable_shift = 4,
 554         .enable_reg = VFP9CLKCTRL_REG,
 555 };
 556
 557 static struct clk keyscan_ck = {
 558         .name = "keyscan_ck",
 559         .parent = &osc_32KHz,
 560         .flags = NEEDS_INITIALIZATION,
 561         .round_rate = &on_off_round_rate,
 562         .set_rate = &on_off_set_rate,
 563         .enable_shift = 0,
 564         .enable_reg = KEYCLKCTRL_REG,
 565 };
 566
 567 static struct clk touch_ck = {
 568         .name = "touch_ck",
 569         .parent = &osc_32KHz,
 570         .flags = NEEDS_INITIALIZATION,
 571         .round_rate = &on_off_round_rate,
 572         .set_rate = &on_off_set_rate,
 573         .enable_shift = 0,
 574         .enable_reg = TSCLKCTRL_REG,
 575 };
 576
 577 static struct clk pwm1_ck = {
 578         .name = "pwm1_ck",
 579         .parent = &osc_32KHz,
 580         .flags = NEEDS_INITIALIZATION,
 581         .round_rate = &on_off_round_rate,
 582         .set_rate = &on_off_set_rate,
 583         .enable_shift = 0,
 584         .enable_reg = PWMCLKCTRL_REG,
 585 };
 586
 587 static struct clk pwm2_ck = {
 588         .name = "pwm2_ck",
 589         .parent = &osc_32KHz,
 590         .flags = NEEDS_INITIALIZATION,
 591         .round_rate = &on_off_round_rate,
 592         .set_rate = &on_off_set_rate,
 593         .enable_shift = 2,
 594         .enable_reg = PWMCLKCTRL_REG,
 595 };
 596
 597 static struct clk jpeg_ck = {
 598         .name = "jpeg_ck",
 599         .parent = &hclk_ck,
 600         .flags = NEEDS_INITIALIZATION,
 601         .round_rate = &on_off_round_rate,
 602         .set_rate = &on_off_set_rate,
 603         .enable_shift = 0,
 604         .enable_reg = JPEGCLKCTRL_REG,
 605 };
 606
 607 static struct clk ms_ck = {
 608         .name = "ms_ck",
 609         .parent = &ck_pll4,
 610         .flags = NEEDS_INITIALIZATION,
 611         .round_rate = &on_off_round_rate,
 612         .set_rate = &on_off_set_rate,
 613         .enable_shift = 5,
 614         .enable_reg = MSCTRL_REG,
 615 };
 616
 617 static struct clk dum_ck = {
 618         .name = "dum_ck",
 619         .parent = &hclk_ck,
 620         .flags = NEEDS_INITIALIZATION,
 621         .round_rate = &on_off_round_rate,
 622         .set_rate = &on_off_set_rate,
 623         .enable_shift = 0,
 624         .enable_reg = DUMCLKCTRL_REG,
 625 };
 626
 627 static struct clk flash_ck = {
 628         .name = "flash_ck",
 629         .parent = &hclk_ck,
 630         .round_rate = &on_off_round_rate,
 631         .set_rate = &on_off_set_rate,
 632         .enable_shift = 1,      /* Only MLC clock supported */
 633         .enable_reg = FLASHCLKCTRL_REG,
 634 };
 635
 636 static struct clk i2c0_ck = {
 637         .name = "i2c0_ck",
 638         .parent = &per_ck,
 639         .flags = NEEDS_INITIALIZATION,
 640         .round_rate = &on_off_round_rate,
 641         .set_rate = &on_off_set_rate,
 642         .enable_shift = 0,
 643         .enable_reg = I2CCLKCTRL_REG,
 644 };
 645
 646 static struct clk i2c1_ck = {
 647         .name = "i2c1_ck",
 648         .parent = &per_ck,
 649         .flags = NEEDS_INITIALIZATION,
 650         .round_rate = &on_off_round_rate,
 651         .set_rate = &on_off_set_rate,
 652         .enable_shift = 1,
 653         .enable_reg = I2CCLKCTRL_REG,
 654 };
 655
 656 static struct clk i2c2_ck = {
 657         .name = "i2c2_ck",
 658         .parent = &per_ck,
 659         .flags = NEEDS_INITIALIZATION,
 660         .round_rate = &on_off_round_rate,
 661         .set_rate = &on_off_set_rate,
 662         .enable_shift = 2,
 663         .enable_reg = USB_OTG_CLKCTRL_REG,
 664 };
 665
 666 static struct clk spi0_ck = {
 667         .name = "spi0_ck",
 668         .parent = &hclk_ck,
 669         .flags = NEEDS_INITIALIZATION,
 670         .round_rate = &on_off_round_rate,
 671         .set_rate = &on_off_set_rate,
 672         .enable_shift = 0,
 673         .enable_reg = SPICTRL_REG,
 674 };
 675
 676 static struct clk spi1_ck = {
 677         .name = "spi1_ck",
 678         .parent = &hclk_ck,
 679         .flags = NEEDS_INITIALIZATION,
 680         .round_rate = &on_off_round_rate,
 681         .set_rate = &on_off_set_rate,
 682         .enable_shift = 4,
 683         .enable_reg = SPICTRL_REG,
 684 };
 685
 686 static struct clk dma_ck = {
 687         .name = "dma_ck",
 688         .parent = &hclk_ck,
 689         .round_rate = &on_off_round_rate,
 690         .set_rate = &on_off_set_rate,
 691         .enable_shift = 0,
 692         .enable_reg = DMACLKCTRL_REG,
 693 };
 694
 695 static struct clk uart3_ck = {
 696         .name = "uart3_ck",
 697         .parent = &per_ck,
 698         .flags = NEEDS_INITIALIZATION,
 699         .round_rate = &on_off_round_rate,
 700         .set_rate = &on_off_set_rate,
 701         .rate = 1,
 702         .enable_shift = 0,
 703         .enable_reg = UARTCLKCTRL_REG,
 704 };
 705
 706 static struct clk uart4_ck = {
 707         .name = "uart4_ck",
 708         .parent = &per_ck,
 709         .flags = NEEDS_INITIALIZATION,
 710         .round_rate = &on_off_round_rate,
 711         .set_rate = &on_off_set_rate,
 712         .enable_shift = 1,
 713         .enable_reg = UARTCLKCTRL_REG,
 714 };
 715
 716 static struct clk uart5_ck = {
 717         .name = "uart5_ck",
 718         .parent = &per_ck,
 719         .flags = NEEDS_INITIALIZATION,
 720         .round_rate = &on_off_round_rate,
 721         .set_rate = &on_off_set_rate,
 722         .rate = 1,
 723         .enable_shift = 2,
 724         .enable_reg = UARTCLKCTRL_REG,
 725 };
 726
 727 static struct clk uart6_ck = {
 728         .name = "uart6_ck",
 729         .parent = &per_ck,
 730         .flags = NEEDS_INITIALIZATION,
 731         .round_rate = &on_off_round_rate,
 732         .set_rate = &on_off_set_rate,
 733         .enable_shift = 3,
 734         .enable_reg = UARTCLKCTRL_REG,
 735 };
 736
 737 static struct clk wdt_ck = {
 738         .name = "wdt_ck",
 739         .parent = &per_ck,
 740         .flags = NEEDS_INITIALIZATION,
 741         .round_rate = &on_off_round_rate,
 742         .set_rate = &on_off_set_rate,
 743         .enable_shift = 0,
 744         .enable_reg = TIMCLKCTRL_REG,
 745 };
 746
 747 /* These clocks are visible outside this module
 748  * and can be initialized
 749  */
 750 static struct clk *onchip_clks[] = {
 751         &ck_13MHz,
 752         &ck_pll1,
 753         &ck_pll4,
 754         &ck_pll5,
 755         &ck_pll3,
 756         &vfp9_ck,
 757         &m2hclk_ck,
 758         &hclk_ck,
 759         &dma_ck,
 760         &flash_ck,
 761         &dum_ck,
 762         &keyscan_ck,
 763         &pwm1_ck,
 764         &pwm2_ck,
 765         &jpeg_ck,
 766         &ms_ck,
 767         &touch_ck,
 768         &i2c0_ck,
 769         &i2c1_ck,
 770         &i2c2_ck,
 771         &spi0_ck,
 772         &spi1_ck,
 773         &uart3_ck,
 774         &uart4_ck,
 775         &uart5_ck,
 776         &uart6_ck,
 777         &wdt_ck,
 778 };
 779
 780 static int local_clk_enable(struct clk *clk)
 781 {
 782         int ret = 0;
 783
 784         if (!(clk->flags & FIXED_RATE) && !clk->rate && clk->set_rate
 785             && clk->user_rate)
 786                 ret = clk->set_rate(clk, clk->user_rate);
 787         return ret;
 788 }
 789
 790 static void local_clk_disable(struct clk *clk)
 791 {
 792         if (!(clk->flags & FIXED_RATE) && clk->rate && clk->set_rate)
 793                 clk->set_rate(clk, 0);
 794 }
 795
 796 static void local_clk_unuse(struct clk *clk)
 797 {
 798         if (clk->usecount > 0 && !(--clk->usecount)) {
 799                 local_clk_disable(clk);
 800                 if (clk->parent)
 801                         local_clk_unuse(clk->parent);
 802         }
 803 }
 804
 805 static int local_clk_use(struct clk *clk)
 806 {
 807         int ret = 0;
 808         if (clk->usecount++ == 0) {
 809                 if (clk->parent)
 810                         ret = local_clk_use(clk->parent);
 811
 812                 if (ret != 0) {
 813                         clk->usecount--;
 814                         goto out;
 815                 }
 816
 817                 ret = local_clk_enable(clk);
 818
 819                 if (ret != 0 && clk->parent) {
 820                         local_clk_unuse(clk->parent);
 821                         clk->usecount--;
 822                 }
 823         }
 824 out:
 825         return ret;
 826 }
 827
 828 static int local_set_rate(struct clk *clk, u32 rate)
 829 {
 830         int ret = -EINVAL;
 831         if (clk->set_rate) {
 832
 833                 if (clk->user_rate == clk->rate && clk->parent->rate) {
 834                         /* if clock enabled or rate not set */
 835                         clk->user_rate = clk->round_rate(clk, rate);
 836                         ret = clk->set_rate(clk, clk->user_rate);
 837                 } else
 838                         clk->user_rate = clk->round_rate(clk, rate);
 839                 ret = 0;
 840         }
 841         return ret;
 842 }
 843
 844 int clk_set_rate(struct clk *clk, unsigned long rate)
 845 {
 846         int ret = -EINVAL;
 847
 848         if (clk->flags & FIXED_RATE)
 849                 goto out;
 850
 851         clock_lock();
 852         if ((clk->flags & PARENT_SET_RATE) && clk->parent) {
 853
 854                 clk->user_rate = clk->round_rate(clk, rate);
 855                 /* parent clock needs to be refreshed
 856                    for the setting to take effect */
 857         } else {
 858                 ret = local_set_rate(clk, rate);
 859         }
 860         ret = 0;
 861         clock_unlock();
 862
 863 out:
 864         return ret;
 865 }
 866
 867 EXPORT_SYMBOL(clk_set_rate);
 868
 869 struct clk *clk_get(struct device *dev, const char *id)
 870 {
 871         struct clk *clk = ERR_PTR(-ENOENT);
 872         struct clk **clkp;
 873
 874         clock_lock();
 875         for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
 876              clkp++) {
 877                 if (strcmp(id, (*clkp)->name) == 0
 878                     && try_module_get((*clkp)->owner)) {
 879                         clk = (*clkp);
 880                         break;
 881                 }
 882         }
 883         clock_unlock();
 884
 885         return clk;
 886 }
 887 EXPORT_SYMBOL(clk_get);
 888
 889 void clk_put(struct clk *clk)
 890 {
 891         clock_lock();
 892         if (clk && !IS_ERR(clk))
 893                 module_put(clk->owner);
 894         clock_unlock();
 895 }
 896 EXPORT_SYMBOL(clk_put);
 897
 898 unsigned long clk_get_rate(struct clk *clk)
 899 {
 900         unsigned long ret;
 901         clock_lock();
 902         ret = clk->rate;
 903         clock_unlock();
 904         return ret;
 905 }
 906 EXPORT_SYMBOL(clk_get_rate);
 907
 908 int clk_enable(struct clk *clk)
 909 {
 910         int ret = 0;
 911
 912         clock_lock();
 913         ret = local_clk_use(clk);
 914         clock_unlock();
 915         return ret;
 916 }
 917
 918 EXPORT_SYMBOL(clk_enable);
 919
 920 void clk_disable(struct clk *clk)
 921 {
 922         clock_lock();
 923         local_clk_unuse(clk);
 924         clock_unlock();
 925 }
 926
 927 EXPORT_SYMBOL(clk_disable);
 928
 929 long clk_round_rate(struct clk *clk, unsigned long rate)
 930 {
 931         long ret;
 932         clock_lock();
 933         if (clk->round_rate)
 934                 ret = clk->round_rate(clk, rate);
 935         else
 936                 ret = clk->rate;
 937         clock_unlock();
 938         return ret;
 939 }
 940
 941 EXPORT_SYMBOL(clk_round_rate);
 942
 943 int clk_set_parent(struct clk *clk, struct clk *parent)
 944 {
 945         int ret = -ENODEV;
 946         if (!clk->set_parent)
 947                 goto out;
 948
 949         clock_lock();
 950         ret = clk->set_parent(clk, parent);
 951         if (!ret)
 952                 clk->parent = parent;
 953         clock_unlock();
 954
 955 out:
 956         return ret;
 957 }
 958
 959 EXPORT_SYMBOL(clk_set_parent);
 960
 961 static int __init clk_init(void)
 962 {
 963         struct clk **clkp;
 964
 965         /* Disable autoclocking, as it doesn't seem to work */
 966         __raw_writel(0xff, AUTOCLK_CTRL);
 967
 968         for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
 969              clkp++) {
 970                 if (((*clkp)->flags & NEEDS_INITIALIZATION)
 971                     && ((*clkp)->set_rate)) {
 972                         (*clkp)->user_rate = (*clkp)->rate;
 973                         local_set_rate((*clkp), (*clkp)->user_rate);
 974                         if ((*clkp)->set_parent)
 975                                 (*clkp)->set_parent((*clkp), (*clkp)->parent);
 976                 }
 977                 pr_debug("%s: clock %s, rate %ld\n",
 978                         __func__, (*clkp)->name, (*clkp)->rate);
 979         }
 980
 981         local_clk_use(&ck_pll4);
 982
 983         /* if ck_13MHz is not used, disable it. */
 984         if (ck_13MHz.usecount == 0)
 985                 local_clk_disable(&ck_13MHz);
 986
 987         /* Disable autoclocking */
 988         __raw_writeb(0xff, AUTOCLK_CTRL);
 989
 990         return 0;
 991 }
 992
 993 arch_initcall(clk_init);