arch/arm/mach-mx3/clock.c

   1 /*
   2  * Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
   3  * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  17  * MA 02110-1301, USA.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/delay.h>
  23 #include <linux/clk.h>
  24 #include <linux/err.h>
  25 #include <linux/io.h>
  26
  27 #include <asm/clkdev.h>
  28 #include <asm/div64.h>
  29
  30 #include <mach/clock.h>
  31 #include <mach/hardware.h>
  32 #include <mach/common.h>
  33
  34 #include "crm_regs.h"
  35
  36 #define PRE_DIV_MIN_FREQ    10000000 /* Minimum Frequency after Predivider */
  37
  38 static void __calc_pre_post_dividers(u32 div, u32 *pre, u32 *post)
  39 {
  40         u32 min_pre, temp_pre, old_err, err;
  41
  42         if (div >= 512) {
  43                 *pre = 8;
  44                 *post = 64;
  45         } else if (div >= 64) {
  46                 min_pre = (div - 1) / 64 + 1;
  47                 old_err = 8;
  48                 for (temp_pre = 8; temp_pre >= min_pre; temp_pre--) {
  49                         err = div % temp_pre;
  50                         if (err == 0) {
  51                                 *pre = temp_pre;
  52                                 break;
  53                         }
  54                         err = temp_pre - err;
  55                         if (err < old_err) {
  56                                 old_err = err;
  57                                 *pre = temp_pre;
  58                         }
  59                 }
  60                 *post = (div + *pre - 1) / *pre;
  61         } else if (div <= 8) {
  62                 *pre = div;
  63                 *post = 1;
  64         } else {
  65                 *pre = 1;
  66                 *post = div;
  67         }
  68 }
  69
  70 static struct clk mcu_pll_clk;
  71 static struct clk serial_pll_clk;
  72 static struct clk ipg_clk;
  73 static struct clk ckih_clk;
  74
  75 static int cgr_enable(struct clk *clk)
  76 {
  77         u32 reg;
  78
  79         if (!clk->enable_reg)
  80                 return 0;
  81
  82         reg = __raw_readl(clk->enable_reg);
  83         reg |= 3 << clk->enable_shift;
  84         __raw_writel(reg, clk->enable_reg);
  85
  86         return 0;
  87 }
  88
  89 static void cgr_disable(struct clk *clk)
  90 {
  91         u32 reg;
  92
  93         if (!clk->enable_reg)
  94                 return;
  95
  96         reg = __raw_readl(clk->enable_reg);
  97         reg &= ~(3 << clk->enable_shift);
  98
  99         /* special case for EMI clock */
 100         if (clk->enable_reg == MXC_CCM_CGR2 && clk->enable_shift == 8)
 101                 reg |= (1 << clk->enable_shift);
 102
 103         __raw_writel(reg, clk->enable_reg);
 104 }
 105
 106 static unsigned long pll_ref_get_rate(void)
 107 {
 108         unsigned long ccmr;
 109         unsigned int prcs;
 110
 111         ccmr = __raw_readl(MXC_CCM_CCMR);
 112         prcs = (ccmr & MXC_CCM_CCMR_PRCS_MASK) >> MXC_CCM_CCMR_PRCS_OFFSET;
 113         if (prcs == 0x1)
 114                 return CKIL_CLK_FREQ * 1024;
 115         else
 116                 return clk_get_rate(&ckih_clk);
 117 }
 118
 119 static unsigned long usb_pll_get_rate(struct clk *clk)
 120 {
 121         unsigned long reg;
 122
 123         reg = __raw_readl(MXC_CCM_UPCTL);
 124
 125         return mxc_decode_pll(reg, pll_ref_get_rate());
 126 }
 127
 128 static unsigned long serial_pll_get_rate(struct clk *clk)
 129 {
 130         unsigned long reg;
 131
 132         reg = __raw_readl(MXC_CCM_SRPCTL);
 133
 134         return mxc_decode_pll(reg, pll_ref_get_rate());
 135 }
 136
 137 static unsigned long mcu_pll_get_rate(struct clk *clk)
 138 {
 139         unsigned long reg, ccmr;
 140
 141         ccmr = __raw_readl(MXC_CCM_CCMR);
 142
 143         if (!(ccmr & MXC_CCM_CCMR_MPE) || (ccmr & MXC_CCM_CCMR_MDS))
 144                 return clk_get_rate(&ckih_clk);
 145
 146         reg = __raw_readl(MXC_CCM_MPCTL);
 147
 148         return mxc_decode_pll(reg, pll_ref_get_rate());
 149 }
 150
 151 static int usb_pll_enable(struct clk *clk)
 152 {
 153         u32 reg;
 154
 155         reg = __raw_readl(MXC_CCM_CCMR);
 156         reg |= MXC_CCM_CCMR_UPE;
 157         __raw_writel(reg, MXC_CCM_CCMR);
 158
 159         /* No lock bit on MX31, so using max time from spec */
 160         udelay(80);
 161
 162         return 0;
 163 }
 164
 165 static void usb_pll_disable(struct clk *clk)
 166 {
 167         u32 reg;
 168
 169         reg = __raw_readl(MXC_CCM_CCMR);
 170         reg &= ~MXC_CCM_CCMR_UPE;
 171         __raw_writel(reg, MXC_CCM_CCMR);
 172 }
 173
 174 static int serial_pll_enable(struct clk *clk)
 175 {
 176         u32 reg;
 177
 178         reg = __raw_readl(MXC_CCM_CCMR);
 179         reg |= MXC_CCM_CCMR_SPE;
 180         __raw_writel(reg, MXC_CCM_CCMR);
 181
 182         /* No lock bit on MX31, so using max time from spec */
 183         udelay(80);
 184
 185         return 0;
 186 }
 187
 188 static void serial_pll_disable(struct clk *clk)
 189 {
 190         u32 reg;
 191
 192         reg = __raw_readl(MXC_CCM_CCMR);
 193         reg &= ~MXC_CCM_CCMR_SPE;
 194         __raw_writel(reg, MXC_CCM_CCMR);
 195 }
 196
 197 #define PDR0(mask, off) ((__raw_readl(MXC_CCM_PDR0) & mask) >> off)
 198 #define PDR1(mask, off) ((__raw_readl(MXC_CCM_PDR1) & mask) >> off)
 199 #define PDR2(mask, off) ((__raw_readl(MXC_CCM_PDR2) & mask) >> off)
 200
 201 static unsigned long mcu_main_get_rate(struct clk *clk)
 202 {
 203         u32 pmcr0 = __raw_readl(MXC_CCM_PMCR0);
 204
 205         if ((pmcr0 & MXC_CCM_PMCR0_DFSUP1) == MXC_CCM_PMCR0_DFSUP1_SPLL)
 206                 return clk_get_rate(&serial_pll_clk);
 207         else
 208                 return clk_get_rate(&mcu_pll_clk);
 209 }
 210
 211 static unsigned long ahb_get_rate(struct clk *clk)
 212 {
 213         unsigned long max_pdf;
 214
 215         max_pdf = PDR0(MXC_CCM_PDR0_MAX_PODF_MASK,
 216                        MXC_CCM_PDR0_MAX_PODF_OFFSET);
 217         return clk_get_rate(clk->parent) / (max_pdf + 1);
 218 }
 219
 220 static unsigned long ipg_get_rate(struct clk *clk)
 221 {
 222         unsigned long ipg_pdf;
 223
 224         ipg_pdf = PDR0(MXC_CCM_PDR0_IPG_PODF_MASK,
 225                        MXC_CCM_PDR0_IPG_PODF_OFFSET);
 226         return clk_get_rate(clk->parent) / (ipg_pdf + 1);
 227 }
 228
 229 static unsigned long nfc_get_rate(struct clk *clk)
 230 {
 231         unsigned long nfc_pdf;
 232
 233         nfc_pdf = PDR0(MXC_CCM_PDR0_NFC_PODF_MASK,
 234                        MXC_CCM_PDR0_NFC_PODF_OFFSET);
 235         return clk_get_rate(clk->parent) / (nfc_pdf + 1);
 236 }
 237
 238 static unsigned long hsp_get_rate(struct clk *clk)
 239 {
 240         unsigned long hsp_pdf;
 241
 242         hsp_pdf = PDR0(MXC_CCM_PDR0_HSP_PODF_MASK,
 243                        MXC_CCM_PDR0_HSP_PODF_OFFSET);
 244         return clk_get_rate(clk->parent) / (hsp_pdf + 1);
 245 }
 246
 247 static unsigned long usb_get_rate(struct clk *clk)
 248 {
 249         unsigned long usb_pdf, usb_prepdf;
 250
 251         usb_pdf = PDR1(MXC_CCM_PDR1_USB_PODF_MASK,
 252                        MXC_CCM_PDR1_USB_PODF_OFFSET);
 253         usb_prepdf = PDR1(MXC_CCM_PDR1_USB_PRDF_MASK,
 254                           MXC_CCM_PDR1_USB_PRDF_OFFSET);
 255         return clk_get_rate(clk->parent) / (usb_prepdf + 1) / (usb_pdf + 1);
 256 }
 257
 258 static unsigned long csi_get_rate(struct clk *clk)
 259 {
 260         u32 reg, pre, post;
 261
 262         reg = __raw_readl(MXC_CCM_PDR0);
 263         pre = (reg & MXC_CCM_PDR0_CSI_PRDF_MASK) >>
 264             MXC_CCM_PDR0_CSI_PRDF_OFFSET;
 265         pre++;
 266         post = (reg & MXC_CCM_PDR0_CSI_PODF_MASK) >>
 267             MXC_CCM_PDR0_CSI_PODF_OFFSET;
 268         post++;
 269         return clk_get_rate(clk->parent) / (pre * post);
 270 }
 271
 272 static unsigned long csi_round_rate(struct clk *clk, unsigned long rate)
 273 {
 274         u32 pre, post, parent = clk_get_rate(clk->parent);
 275         u32 div = parent / rate;
 276
 277         if (parent % rate)
 278                 div++;
 279
 280         __calc_pre_post_dividers(div, &pre, &post);
 281
 282         return parent / (pre * post);
 283 }
 284
 285 static int csi_set_rate(struct clk *clk, unsigned long rate)
 286 {
 287         u32 reg, div, pre, post, parent = clk_get_rate(clk->parent);
 288
 289         div = parent / rate;
 290
 291         if ((parent / div) != rate)
 292                 return -EINVAL;
 293
 294         __calc_pre_post_dividers(div, &pre, &post);
 295
 296         /* Set CSI clock divider */
 297         reg = __raw_readl(MXC_CCM_PDR0) &
 298             ~(MXC_CCM_PDR0_CSI_PODF_MASK | MXC_CCM_PDR0_CSI_PRDF_MASK);
 299         reg |= (post - 1) << MXC_CCM_PDR0_CSI_PODF_OFFSET;
 300         reg |= (pre - 1) << MXC_CCM_PDR0_CSI_PRDF_OFFSET;
 301         __raw_writel(reg, MXC_CCM_PDR0);
 302
 303         return 0;
 304 }
 305
 306 static unsigned long ssi1_get_rate(struct clk *clk)
 307 {
 308         unsigned long ssi1_pdf, ssi1_prepdf;
 309
 310         ssi1_pdf = PDR1(MXC_CCM_PDR1_SSI1_PODF_MASK,
 311                         MXC_CCM_PDR1_SSI1_PODF_OFFSET);
 312         ssi1_prepdf = PDR1(MXC_CCM_PDR1_SSI1_PRE_PODF_MASK,
 313                            MXC_CCM_PDR1_SSI1_PRE_PODF_OFFSET);
 314         return clk_get_rate(clk->parent) / (ssi1_prepdf + 1) / (ssi1_pdf + 1);
 315 }
 316
 317 static unsigned long ssi2_get_rate(struct clk *clk)
 318 {
 319         unsigned long ssi2_pdf, ssi2_prepdf;
 320
 321         ssi2_pdf = PDR1(MXC_CCM_PDR1_SSI2_PODF_MASK,
 322                         MXC_CCM_PDR1_SSI2_PODF_OFFSET);
 323         ssi2_prepdf = PDR1(MXC_CCM_PDR1_SSI2_PRE_PODF_MASK,
 324                            MXC_CCM_PDR1_SSI2_PRE_PODF_OFFSET);
 325         return clk_get_rate(clk->parent) / (ssi2_prepdf + 1) / (ssi2_pdf + 1);
 326 }
 327
 328 static unsigned long firi_get_rate(struct clk *clk)
 329 {
 330         unsigned long firi_pdf, firi_prepdf;
 331
 332         firi_pdf = PDR1(MXC_CCM_PDR1_FIRI_PODF_MASK,
 333                         MXC_CCM_PDR1_FIRI_PODF_OFFSET);
 334         firi_prepdf = PDR1(MXC_CCM_PDR1_FIRI_PRE_PODF_MASK,
 335                            MXC_CCM_PDR1_FIRI_PRE_PODF_OFFSET);
 336         return clk_get_rate(clk->parent) / (firi_prepdf + 1) / (firi_pdf + 1);
 337 }
 338
 339 static unsigned long firi_round_rate(struct clk *clk, unsigned long rate)
 340 {
 341         u32 pre, post;
 342         u32 parent = clk_get_rate(clk->parent);
 343         u32 div = parent / rate;
 344
 345         if (parent % rate)
 346                 div++;
 347
 348         __calc_pre_post_dividers(div, &pre, &post);
 349
 350         return parent / (pre * post);
 351
 352 }
 353
 354 static int firi_set_rate(struct clk *clk, unsigned long rate)
 355 {
 356         u32 reg, div, pre, post, parent = clk_get_rate(clk->parent);
 357
 358         div = parent / rate;
 359
 360         if ((parent / div) != rate)
 361                 return -EINVAL;
 362
 363         __calc_pre_post_dividers(div, &pre, &post);
 364
 365         /* Set FIRI clock divider */
 366         reg = __raw_readl(MXC_CCM_PDR1) &
 367             ~(MXC_CCM_PDR1_FIRI_PODF_MASK | MXC_CCM_PDR1_FIRI_PRE_PODF_MASK);
 368         reg |= (pre - 1) << MXC_CCM_PDR1_FIRI_PRE_PODF_OFFSET;
 369         reg |= (post - 1) << MXC_CCM_PDR1_FIRI_PODF_OFFSET;
 370         __raw_writel(reg, MXC_CCM_PDR1);
 371
 372         return 0;
 373 }
 374
 375 static unsigned long mbx_get_rate(struct clk *clk)
 376 {
 377         return clk_get_rate(clk->parent) / 2;
 378 }
 379
 380 static unsigned long mstick1_get_rate(struct clk *clk)
 381 {
 382         unsigned long msti_pdf;
 383
 384         msti_pdf = PDR2(MXC_CCM_PDR2_MST1_PDF_MASK,
 385                         MXC_CCM_PDR2_MST1_PDF_OFFSET);
 386         return clk_get_rate(clk->parent) / (msti_pdf + 1);
 387 }
 388
 389 static unsigned long mstick2_get_rate(struct clk *clk)
 390 {
 391         unsigned long msti_pdf;
 392
 393         msti_pdf = PDR2(MXC_CCM_PDR2_MST2_PDF_MASK,
 394                         MXC_CCM_PDR2_MST2_PDF_OFFSET);
 395         return clk_get_rate(clk->parent) / (msti_pdf + 1);
 396 }
 397
 398 static unsigned long ckih_rate;
 399
 400 static unsigned long clk_ckih_get_rate(struct clk *clk)
 401 {
 402         return ckih_rate;
 403 }
 404
 405 static struct clk ckih_clk = {
 406         .get_rate = clk_ckih_get_rate,
 407 };
 408
 409 static struct clk mcu_pll_clk = {
 410         .parent = &ckih_clk,
 411         .get_rate = mcu_pll_get_rate,
 412 };
 413
 414 static struct clk mcu_main_clk = {
 415         .parent = &mcu_pll_clk,
 416         .get_rate = mcu_main_get_rate,
 417 };
 418
 419 static struct clk serial_pll_clk = {
 420         .parent = &ckih_clk,
 421         .get_rate = serial_pll_get_rate,
 422         .enable = serial_pll_enable,
 423         .disable = serial_pll_disable,
 424 };
 425
 426 static struct clk usb_pll_clk = {
 427         .parent = &ckih_clk,
 428         .get_rate = usb_pll_get_rate,
 429         .enable = usb_pll_enable,
 430         .disable = usb_pll_disable,
 431 };
 432
 433 static struct clk ahb_clk = {
 434         .parent = &mcu_main_clk,
 435         .get_rate = ahb_get_rate,
 436 };
 437
 438 #define DEFINE_CLOCK(name, i, er, es, gr, s, p)         \
 439         static struct clk name = {                      \
 440                 .id             = i,                    \
 441                 .enable_reg     = er,                   \
 442                 .enable_shift   = es,                   \
 443                 .get_rate       = gr,                   \
 444                 .enable         = cgr_enable,           \
 445                 .disable        = cgr_disable,          \
 446                 .secondary      = s,                    \
 447                 .parent         = p,                    \
 448         }
 449
 450 #define DEFINE_CLOCK1(name, i, er, es, getsetround, s, p)       \
 451         static struct clk name = {                              \
 452                 .id             = i,                            \
 453                 .enable_reg     = er,                           \
 454                 .enable_shift   = es,                           \
 455                 .get_rate       = getsetround##_get_rate,       \
 456                 .set_rate       = getsetround##_set_rate,       \
 457                 .round_rate     = getsetround##_round_rate,     \
 458                 .enable         = cgr_enable,                   \
 459                 .disable        = cgr_disable,                  \
 460                 .secondary      = s,                            \
 461                 .parent         = p,                            \
 462         }
 463
 464 DEFINE_CLOCK(perclk_clk,  0, NULL,          0, NULL, NULL, &ipg_clk);
 465
 466 DEFINE_CLOCK(sdhc1_clk,   0, MXC_CCM_CGR0,  0, NULL, NULL, &perclk_clk);
 467 DEFINE_CLOCK(sdhc2_clk,   1, MXC_CCM_CGR0,  2, NULL, NULL, &perclk_clk);
 468 DEFINE_CLOCK(gpt_clk,     0, MXC_CCM_CGR0,  4, NULL, NULL, &perclk_clk);
 469 DEFINE_CLOCK(epit1_clk,   0, MXC_CCM_CGR0,  6, NULL, NULL, &perclk_clk);
 470 DEFINE_CLOCK(epit2_clk,   1, MXC_CCM_CGR0,  8, NULL, NULL, &perclk_clk);
 471 DEFINE_CLOCK(iim_clk,     0, MXC_CCM_CGR0, 10, NULL, NULL, &ipg_clk);
 472 DEFINE_CLOCK(ata_clk,     0, MXC_CCM_CGR0, 12, NULL, NULL, &ipg_clk);
 473 DEFINE_CLOCK(sdma_clk1,   0, MXC_CCM_CGR0, 14, NULL, &sdma_clk1, &ahb_clk);
 474 DEFINE_CLOCK(cspi3_clk,   2, MXC_CCM_CGR0, 16, NULL, NULL, &ipg_clk);
 475 DEFINE_CLOCK(rng_clk,     0, MXC_CCM_CGR0, 18, NULL, NULL, &ipg_clk);
 476 DEFINE_CLOCK(uart1_clk,   0, MXC_CCM_CGR0, 20, NULL, NULL, &perclk_clk);
 477 DEFINE_CLOCK(uart2_clk,   1, MXC_CCM_CGR0, 22, NULL, NULL, &perclk_clk);
 478 DEFINE_CLOCK(ssi1_clk,    0, MXC_CCM_CGR0, 24, ssi1_get_rate, NULL, &serial_pll_clk);
 479 DEFINE_CLOCK(i2c1_clk,    0, MXC_CCM_CGR0, 26, NULL, NULL, &perclk_clk);
 480 DEFINE_CLOCK(i2c2_clk,    1, MXC_CCM_CGR0, 28, NULL, NULL, &perclk_clk);
 481 DEFINE_CLOCK(i2c3_clk,    2, MXC_CCM_CGR0, 30, NULL, NULL, &perclk_clk);
 482
 483 DEFINE_CLOCK(mpeg4_clk,   0, MXC_CCM_CGR1,  0, NULL, NULL, &ahb_clk);
 484 DEFINE_CLOCK(mstick1_clk, 0, MXC_CCM_CGR1,  2, mstick1_get_rate, NULL, &usb_pll_clk);
 485 DEFINE_CLOCK(mstick2_clk, 1, MXC_CCM_CGR1,  4, mstick2_get_rate, NULL, &usb_pll_clk);
 486 DEFINE_CLOCK1(csi_clk,    0, MXC_CCM_CGR1,  6, csi, NULL, &serial_pll_clk);
 487 DEFINE_CLOCK(rtc_clk,     0, MXC_CCM_CGR1,  8, NULL, NULL, &ipg_clk);
 488 DEFINE_CLOCK(wdog_clk,    0, MXC_CCM_CGR1, 10, NULL, NULL, &ipg_clk);
 489 DEFINE_CLOCK(pwm_clk,     0, MXC_CCM_CGR1, 12, NULL, NULL, &perclk_clk);
 490 DEFINE_CLOCK(usb_clk2,    0, MXC_CCM_CGR1, 18, usb_get_rate, NULL, &ahb_clk);
 491 DEFINE_CLOCK(kpp_clk,     0, MXC_CCM_CGR1, 20, NULL, NULL, &ipg_clk);
 492 DEFINE_CLOCK(ipu_clk,     0, MXC_CCM_CGR1, 22, hsp_get_rate, NULL, &mcu_main_clk);
 493 DEFINE_CLOCK(uart3_clk,   2, MXC_CCM_CGR1, 24, NULL, NULL, &perclk_clk);
 494 DEFINE_CLOCK(uart4_clk,   3, MXC_CCM_CGR1, 26, NULL, NULL, &perclk_clk);
 495 DEFINE_CLOCK(uart5_clk,   4, MXC_CCM_CGR1, 28, NULL, NULL, &perclk_clk);
 496 DEFINE_CLOCK(owire_clk,   0, MXC_CCM_CGR1, 30, NULL, NULL, &perclk_clk);
 497
 498 DEFINE_CLOCK(ssi2_clk,    1, MXC_CCM_CGR2,  0, ssi2_get_rate, NULL, &serial_pll_clk);
 499 DEFINE_CLOCK(cspi1_clk,   0, MXC_CCM_CGR2,  2, NULL, NULL, &ipg_clk);
 500 DEFINE_CLOCK(cspi2_clk,   1, MXC_CCM_CGR2,  4, NULL, NULL, &ipg_clk);
 501 DEFINE_CLOCK(mbx_clk,     0, MXC_CCM_CGR2,  6, mbx_get_rate, NULL, &ahb_clk);
 502 DEFINE_CLOCK(emi_clk,     0, MXC_CCM_CGR2,  8, NULL, NULL, &ahb_clk);
 503 DEFINE_CLOCK(rtic_clk,    0, MXC_CCM_CGR2, 10, NULL, NULL, &ahb_clk);
 504 DEFINE_CLOCK1(firi_clk,   0, MXC_CCM_CGR2, 12, firi, NULL, &usb_pll_clk);
 505
 506 DEFINE_CLOCK(sdma_clk2,   0, NULL,          0, NULL, NULL, &ipg_clk);
 507 DEFINE_CLOCK(usb_clk1,    0, NULL,          0, usb_get_rate, NULL, &usb_pll_clk);
 508 DEFINE_CLOCK(nfc_clk,     0, NULL,          0, nfc_get_rate, NULL, &ahb_clk);
 509 DEFINE_CLOCK(scc_clk,     0, NULL,          0, NULL, NULL, &ipg_clk);
 510 DEFINE_CLOCK(ipg_clk,     0, NULL,          0, ipg_get_rate, NULL, &ahb_clk);
 511
 512 #define _REGISTER_CLOCK(d, n, c) \
 513         { \
 514                 .dev_id = d, \
 515                 .con_id = n, \
 516                 .clk = &c, \
 517         },
 518
 519 static struct clk_lookup lookups[] = {
 520         _REGISTER_CLOCK(NULL, "emi", emi_clk)
 521         _REGISTER_CLOCK(NULL, "cspi", cspi1_clk)
 522         _REGISTER_CLOCK(NULL, "cspi", cspi2_clk)
 523         _REGISTER_CLOCK(NULL, "cspi", cspi3_clk)
 524         _REGISTER_CLOCK(NULL, "gpt", gpt_clk)
 525         _REGISTER_CLOCK(NULL, "pwm", pwm_clk)
 526         _REGISTER_CLOCK(NULL, "wdog", wdog_clk)
 527         _REGISTER_CLOCK(NULL, "rtc", rtc_clk)
 528         _REGISTER_CLOCK(NULL, "epit", epit1_clk)
 529         _REGISTER_CLOCK(NULL, "epit", epit2_clk)
 530         _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
 531         _REGISTER_CLOCK("ipu-core", NULL, ipu_clk)
 532         _REGISTER_CLOCK("mx3_sdc_fb", NULL, ipu_clk)
 533         _REGISTER_CLOCK(NULL, "kpp", kpp_clk)
 534         _REGISTER_CLOCK("fsl-usb2-udc", "usb", usb_clk1)
 535         _REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", usb_clk2)
 536         _REGISTER_CLOCK("mx3-camera.0", NULL, csi_clk)
 537         _REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk)
 538         _REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk)
 539         _REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
 540         _REGISTER_CLOCK("imx-uart.3", NULL, uart4_clk)
 541         _REGISTER_CLOCK("imx-uart.4", NULL, uart5_clk)
 542         _REGISTER_CLOCK("imx-i2c.0", NULL, i2c1_clk)
 543         _REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
 544         _REGISTER_CLOCK("imx-i2c.2", NULL, i2c3_clk)
 545         _REGISTER_CLOCK("mxc_w1.0", NULL, owire_clk)
 546         _REGISTER_CLOCK("mxc-mmc.0", NULL, sdhc1_clk)
 547         _REGISTER_CLOCK("mxc-mmc.1", NULL, sdhc2_clk)
 548         _REGISTER_CLOCK(NULL, "ssi", ssi1_clk)
 549         _REGISTER_CLOCK(NULL, "ssi", ssi2_clk)
 550         _REGISTER_CLOCK(NULL, "firi", firi_clk)
 551         _REGISTER_CLOCK(NULL, "ata", ata_clk)
 552         _REGISTER_CLOCK(NULL, "rtic", rtic_clk)
 553         _REGISTER_CLOCK(NULL, "rng", rng_clk)
 554         _REGISTER_CLOCK(NULL, "sdma_ahb", sdma_clk1)
 555         _REGISTER_CLOCK(NULL, "sdma_ipg", sdma_clk2)
 556         _REGISTER_CLOCK(NULL, "mstick", mstick1_clk)
 557         _REGISTER_CLOCK(NULL, "mstick", mstick2_clk)
 558         _REGISTER_CLOCK(NULL, "scc", scc_clk)
 559         _REGISTER_CLOCK(NULL, "iim", iim_clk)
 560         _REGISTER_CLOCK(NULL, "mpeg4", mpeg4_clk)
 561         _REGISTER_CLOCK(NULL, "mbx", mbx_clk)
 562 };
 563
 564 int __init mx31_clocks_init(unsigned long fref)
 565 {
 566         u32 reg;
 567         int i;
 568
 569         ckih_rate = fref;
 570
 571         for (i = 0; i < ARRAY_SIZE(lookups); i++)
 572                 clkdev_add(&lookups[i]);
 573
 574         /* change the csi_clk parent if necessary */
 575         reg = __raw_readl(MXC_CCM_CCMR);
 576         if (!(reg & MXC_CCM_CCMR_CSCS))
 577                 if (clk_set_parent(&csi_clk, &usb_pll_clk))
 578                         pr_err("%s: error changing csi_clk parent\n", __func__);
 579
 580
 581         /* Turn off all possible clocks */
 582         __raw_writel((3 << 4), MXC_CCM_CGR0);
 583         __raw_writel(0, MXC_CCM_CGR1);
 584         __raw_writel((3 << 8) | (3 << 14) | (3 << 16)|
 585                      1 << 27 | 1 << 28, /* Bit 27 and 28 are not defined for
 586                                            MX32, but still required to be set */
 587                      MXC_CCM_CGR2);
 588
 589         /*
 590          * Before turning off usb_pll make sure ipg_per_clk is generated
 591          * by ipg_clk and not usb_pll.
 592          */
 593         __raw_writel(__raw_readl(MXC_CCM_CCMR) | (1 << 24), MXC_CCM_CCMR);
 594
 595         usb_pll_disable(&usb_pll_clk);
 596
 597         pr_info("Clock input source is %ld\n", clk_get_rate(&ckih_clk));
 598
 599         clk_enable(&gpt_clk);
 600         clk_enable(&emi_clk);
 601         clk_enable(&iim_clk);
 602
 603         clk_enable(&serial_pll_clk);
 604
 605         if (mx31_revision() >= CHIP_REV_2_0) {
 606                 reg = __raw_readl(MXC_CCM_PMCR1);
 607                 /* No PLL restart on DVFS switch; enable auto EMI handshake */
 608                 reg |= MXC_CCM_PMCR1_PLLRDIS | MXC_CCM_PMCR1_EMIRQ_EN;
 609                 __raw_writel(reg, MXC_CCM_PMCR1);
 610         }
 611
 612         mxc_timer_init(&ipg_clk);
 613
 614         return 0;
 615 }
 616