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