arch/arm/mach-imx/clock-imx27.c

   1 /*
   2  * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
   3  * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
   4  * Copyright 2008 Martin Fuzzey, mfuzzey@gmail.com
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  * MA 02110-1301, USA.
  19  */
  20
  21 #include <linux/clk.h>
  22 #include <linux/io.h>
  23 #include <linux/module.h>
  24 #include <linux/clkdev.h>
  25
  26 #include <asm/div64.h>
  27
  28 #include <mach/clock.h>
  29 #include <mach/common.h>
  30 #include <mach/hardware.h>
  31
  32 #define IO_ADDR_CCM(off)        (MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR + (off)))
  33
  34 /* Register offsets */
  35 #define CCM_CSCR                IO_ADDR_CCM(0x0)
  36 #define CCM_MPCTL0              IO_ADDR_CCM(0x4)
  37 #define CCM_MPCTL1              IO_ADDR_CCM(0x8)
  38 #define CCM_SPCTL0              IO_ADDR_CCM(0xc)
  39 #define CCM_SPCTL1              IO_ADDR_CCM(0x10)
  40 #define CCM_OSC26MCTL           IO_ADDR_CCM(0x14)
  41 #define CCM_PCDR0               IO_ADDR_CCM(0x18)
  42 #define CCM_PCDR1               IO_ADDR_CCM(0x1c)
  43 #define CCM_PCCR0               IO_ADDR_CCM(0x20)
  44 #define CCM_PCCR1               IO_ADDR_CCM(0x24)
  45 #define CCM_CCSR                IO_ADDR_CCM(0x28)
  46 #define CCM_PMCTL               IO_ADDR_CCM(0x2c)
  47 #define CCM_PMCOUNT             IO_ADDR_CCM(0x30)
  48 #define CCM_WKGDCTL             IO_ADDR_CCM(0x34)
  49
  50 #define CCM_CSCR_UPDATE_DIS     (1 << 31)
  51 #define CCM_CSCR_SSI2           (1 << 23)
  52 #define CCM_CSCR_SSI1           (1 << 22)
  53 #define CCM_CSCR_VPU            (1 << 21)
  54 #define CCM_CSCR_MSHC           (1 << 20)
  55 #define CCM_CSCR_SPLLRES        (1 << 19)
  56 #define CCM_CSCR_MPLLRES        (1 << 18)
  57 #define CCM_CSCR_SP             (1 << 17)
  58 #define CCM_CSCR_MCU            (1 << 16)
  59 #define CCM_CSCR_OSC26MDIV      (1 << 4)
  60 #define CCM_CSCR_OSC26M         (1 << 3)
  61 #define CCM_CSCR_FPM            (1 << 2)
  62 #define CCM_CSCR_SPEN           (1 << 1)
  63 #define CCM_CSCR_MPEN           (1 << 0)
  64
  65 /* i.MX27 TO 2+ */
  66 #define CCM_CSCR_ARM_SRC        (1 << 15)
  67
  68 #define CCM_SPCTL1_LF           (1 << 15)
  69 #define CCM_SPCTL1_BRMO         (1 << 6)
  70
  71 static struct clk mpll_main1_clk, mpll_main2_clk;
  72
  73 static int clk_pccr_enable(struct clk *clk)
  74 {
  75         unsigned long reg;
  76
  77         if (!clk->enable_reg)
  78                 return 0;
  79
  80         reg = __raw_readl(clk->enable_reg);
  81         reg |= 1 << clk->enable_shift;
  82         __raw_writel(reg, clk->enable_reg);
  83
  84         return 0;
  85 }
  86
  87 static void clk_pccr_disable(struct clk *clk)
  88 {
  89         unsigned long reg;
  90
  91         if (!clk->enable_reg)
  92                 return;
  93
  94         reg = __raw_readl(clk->enable_reg);
  95         reg &= ~(1 << clk->enable_shift);
  96         __raw_writel(reg, clk->enable_reg);
  97 }
  98
  99 static int clk_spll_enable(struct clk *clk)
 100 {
 101         unsigned long reg;
 102
 103         reg = __raw_readl(CCM_CSCR);
 104         reg |= CCM_CSCR_SPEN;
 105         __raw_writel(reg, CCM_CSCR);
 106
 107         while (!(__raw_readl(CCM_SPCTL1) & CCM_SPCTL1_LF));
 108
 109         return 0;
 110 }
 111
 112 static void clk_spll_disable(struct clk *clk)
 113 {
 114         unsigned long reg;
 115
 116         reg = __raw_readl(CCM_CSCR);
 117         reg &= ~CCM_CSCR_SPEN;
 118         __raw_writel(reg, CCM_CSCR);
 119 }
 120
 121 static int clk_cpu_set_parent(struct clk *clk, struct clk *parent)
 122 {
 123         int cscr = __raw_readl(CCM_CSCR);
 124
 125         if (clk->parent == parent)
 126                 return 0;
 127
 128         if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
 129                 if (parent == &mpll_main1_clk) {
 130                         cscr |= CCM_CSCR_ARM_SRC;
 131                 } else {
 132                         if (parent == &mpll_main2_clk)
 133                                 cscr &= ~CCM_CSCR_ARM_SRC;
 134                         else
 135                                 return -EINVAL;
 136                 }
 137                 __raw_writel(cscr, CCM_CSCR);
 138                 clk->parent = parent;
 139                 return 0;
 140         }
 141         return -ENODEV;
 142 }
 143
 144 static unsigned long round_rate_cpu(struct clk *clk, unsigned long rate)
 145 {
 146         int div;
 147         unsigned long parent_rate;
 148
 149         parent_rate = clk_get_rate(clk->parent);
 150
 151         div = parent_rate / rate;
 152         if (parent_rate % rate)
 153                 div++;
 154
 155         if (div > 4)
 156                 div = 4;
 157
 158         return parent_rate / div;
 159 }
 160
 161 static int set_rate_cpu(struct clk *clk, unsigned long rate)
 162 {
 163         unsigned int div;
 164         uint32_t reg;
 165         unsigned long parent_rate;
 166
 167         parent_rate = clk_get_rate(clk->parent);
 168
 169         div = parent_rate / rate;
 170
 171         if (div > 4 || div < 1 || ((parent_rate / div) != rate))
 172                 return -EINVAL;
 173
 174         div--;
 175
 176         reg = __raw_readl(CCM_CSCR);
 177         if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
 178                 reg &= ~(3 << 12);
 179                 reg |= div << 12;
 180                 reg &= ~(CCM_CSCR_FPM | CCM_CSCR_SPEN);
 181                 __raw_writel(reg | CCM_CSCR_UPDATE_DIS, CCM_CSCR);
 182         } else {
 183                 printk(KERN_ERR "Can't set CPU frequency!\n");
 184         }
 185
 186         return 0;
 187 }
 188
 189 static unsigned long round_rate_per(struct clk *clk, unsigned long rate)
 190 {
 191         u32 div;
 192         unsigned long parent_rate;
 193
 194         parent_rate = clk_get_rate(clk->parent);
 195
 196         div = parent_rate / rate;
 197         if (parent_rate % rate)
 198                 div++;
 199
 200         if (div > 64)
 201                 div = 64;
 202
 203         return parent_rate / div;
 204 }
 205
 206 static int set_rate_per(struct clk *clk, unsigned long rate)
 207 {
 208         u32 reg;
 209         u32 div;
 210         unsigned long parent_rate;
 211
 212         parent_rate = clk_get_rate(clk->parent);
 213
 214         if (clk->id < 0 || clk->id > 3)
 215                 return -EINVAL;
 216
 217         div = parent_rate / rate;
 218         if (div > 64 || div < 1 || ((parent_rate / div) != rate))
 219                 return -EINVAL;
 220         div--;
 221
 222         reg = __raw_readl(CCM_PCDR1) & ~(0x3f << (clk->id << 3));
 223         reg |= div << (clk->id << 3);
 224         __raw_writel(reg, CCM_PCDR1);
 225
 226         return 0;
 227 }
 228
 229 static unsigned long get_rate_usb(struct clk *clk)
 230 {
 231         unsigned long usb_pdf;
 232         unsigned long parent_rate;
 233
 234         parent_rate = clk_get_rate(clk->parent);
 235
 236         usb_pdf = (__raw_readl(CCM_CSCR) >> 28) & 0x7;
 237
 238         return parent_rate / (usb_pdf + 1U);
 239 }
 240
 241 static unsigned long get_rate_ssix(struct clk *clk, unsigned long pdf)
 242 {
 243         unsigned long parent_rate;
 244
 245         parent_rate = clk_get_rate(clk->parent);
 246
 247         if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
 248                 pdf += 4;  /* MX27 TO2+ */
 249         else
 250                 pdf = (pdf < 2) ? 124UL : pdf;  /* MX21 & MX27 TO1 */
 251
 252         return 2UL * parent_rate / pdf;
 253 }
 254
 255 static unsigned long get_rate_ssi1(struct clk *clk)
 256 {
 257         return get_rate_ssix(clk, (__raw_readl(CCM_PCDR0) >> 16) & 0x3f);
 258 }
 259
 260 static unsigned long get_rate_ssi2(struct clk *clk)
 261 {
 262         return get_rate_ssix(clk, (__raw_readl(CCM_PCDR0) >> 26) & 0x3f);
 263 }
 264
 265 static unsigned long get_rate_nfc(struct clk *clk)
 266 {
 267         unsigned long nfc_pdf;
 268         unsigned long parent_rate;
 269
 270         parent_rate = clk_get_rate(clk->parent);
 271
 272         if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
 273                 nfc_pdf = (__raw_readl(CCM_PCDR0) >> 6) & 0xf;
 274         else
 275                 nfc_pdf = (__raw_readl(CCM_PCDR0) >> 12) & 0xf;
 276
 277         return parent_rate / (nfc_pdf + 1);
 278 }
 279
 280 static unsigned long get_rate_vpu(struct clk *clk)
 281 {
 282         unsigned long vpu_pdf;
 283         unsigned long parent_rate;
 284
 285         parent_rate = clk_get_rate(clk->parent);
 286
 287         if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
 288                 vpu_pdf = (__raw_readl(CCM_PCDR0) >> 10) & 0x3f;
 289                 vpu_pdf += 4;
 290         } else {
 291                 vpu_pdf = (__raw_readl(CCM_PCDR0) >> 8) & 0xf;
 292                 vpu_pdf = (vpu_pdf < 2) ? 124 : vpu_pdf;
 293         }
 294
 295         return 2UL * parent_rate / vpu_pdf;
 296 }
 297
 298 static unsigned long round_rate_parent(struct clk *clk, unsigned long rate)
 299 {
 300         return clk->parent->round_rate(clk->parent, rate);
 301 }
 302
 303 static unsigned long get_rate_parent(struct clk *clk)
 304 {
 305         return clk_get_rate(clk->parent);
 306 }
 307
 308 static int set_rate_parent(struct clk *clk, unsigned long rate)
 309 {
 310         return clk->parent->set_rate(clk->parent, rate);
 311 }
 312
 313 /* in Hz */
 314 static unsigned long external_high_reference = 26000000;
 315
 316 static unsigned long get_rate_high_reference(struct clk *clk)
 317 {
 318         return external_high_reference;
 319 }
 320
 321 /* in Hz */
 322 static unsigned long external_low_reference = 32768;
 323
 324 static unsigned long get_rate_low_reference(struct clk *clk)
 325 {
 326         return external_low_reference;
 327 }
 328
 329 static unsigned long get_rate_fpm(struct clk *clk)
 330 {
 331         return clk_get_rate(clk->parent) * 1024;
 332 }
 333
 334 static unsigned long get_rate_mpll(struct clk *clk)
 335 {
 336         return mxc_decode_pll(__raw_readl(CCM_MPCTL0),
 337                         clk_get_rate(clk->parent));
 338 }
 339
 340 static unsigned long get_rate_mpll_main(struct clk *clk)
 341 {
 342         unsigned long parent_rate;
 343
 344         parent_rate = clk_get_rate(clk->parent);
 345
 346         /* i.MX27 TO2:
 347          * clk->id == 0: arm clock source path 1 which is from 2 * MPLL / 2
 348          * clk->id == 1: arm clock source path 2 which is from 2 * MPLL / 3
 349          */
 350         if (mx27_revision() >= IMX_CHIP_REVISION_2_0 && clk->id == 1)
 351                 return 2UL * parent_rate / 3UL;
 352
 353         return parent_rate;
 354 }
 355
 356 static unsigned long get_rate_spll(struct clk *clk)
 357 {
 358         uint32_t reg;
 359         unsigned long rate;
 360
 361         rate = clk_get_rate(clk->parent);
 362
 363         reg = __raw_readl(CCM_SPCTL0);
 364
 365         /* On TO2 we have to write the value back. Otherwise we
 366          * read 0 from this register the next time.
 367          */
 368         if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
 369                 __raw_writel(reg, CCM_SPCTL0);
 370
 371         return mxc_decode_pll(reg, rate);
 372 }
 373
 374 static unsigned long get_rate_cpu(struct clk *clk)
 375 {
 376         u32 div;
 377         unsigned long rate;
 378
 379         if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
 380                 div = (__raw_readl(CCM_CSCR) >> 12) & 0x3;
 381         else
 382                 div = (__raw_readl(CCM_CSCR) >> 13) & 0x7;
 383
 384         rate = clk_get_rate(clk->parent);
 385         return rate / (div + 1);
 386 }
 387
 388 static unsigned long get_rate_ahb(struct clk *clk)
 389 {
 390         unsigned long rate, bclk_pdf;
 391
 392         if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
 393                 bclk_pdf = (__raw_readl(CCM_CSCR) >> 8) & 0x3;
 394         else
 395                 bclk_pdf = (__raw_readl(CCM_CSCR) >> 9) & 0xf;
 396
 397         rate = clk_get_rate(clk->parent);
 398         return rate / (bclk_pdf + 1);
 399 }
 400
 401 static unsigned long get_rate_ipg(struct clk *clk)
 402 {
 403         unsigned long rate, ipg_pdf;
 404
 405         if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
 406                 return clk_get_rate(clk->parent);
 407         else
 408                 ipg_pdf = (__raw_readl(CCM_CSCR) >> 8) & 1;
 409
 410         rate = clk_get_rate(clk->parent);
 411         return rate / (ipg_pdf + 1);
 412 }
 413
 414 static unsigned long get_rate_per(struct clk *clk)
 415 {
 416         unsigned long perclk_pdf, parent_rate;
 417
 418         parent_rate = clk_get_rate(clk->parent);
 419
 420         if (clk->id < 0 || clk->id > 3)
 421                 return 0;
 422
 423         perclk_pdf = (__raw_readl(CCM_PCDR1) >> (clk->id << 3)) & 0x3f;
 424
 425         return parent_rate / (perclk_pdf + 1);
 426 }
 427
 428 /*
 429  * the high frequency external clock reference
 430  * Default case is 26MHz. Could be changed at runtime
 431  * with a call to change_external_high_reference()
 432  */
 433 static struct clk ckih_clk = {
 434         .get_rate       = get_rate_high_reference,
 435 };
 436
 437 static struct clk mpll_clk = {
 438         .parent         = &ckih_clk,
 439         .get_rate       = get_rate_mpll,
 440 };
 441
 442 /* For i.MX27 TO2, it is the MPLL path 1 of ARM core
 443  * It provides the clock source whose rate is same as MPLL
 444  */
 445 static struct clk mpll_main1_clk = {
 446         .id             = 0,
 447         .parent         = &mpll_clk,
 448         .get_rate       = get_rate_mpll_main,
 449 };
 450
 451 /* For i.MX27 TO2, it is the MPLL path 2 of ARM core
 452  * It provides the clock source whose rate is same MPLL * 2 / 3
 453  */
 454 static struct clk mpll_main2_clk = {
 455         .id             = 1,
 456         .parent         = &mpll_clk,
 457         .get_rate       = get_rate_mpll_main,
 458 };
 459
 460 static struct clk ahb_clk = {
 461         .parent         = &mpll_main2_clk,
 462         .get_rate       = get_rate_ahb,
 463 };
 464
 465 static struct clk ipg_clk = {
 466         .parent         = &ahb_clk,
 467         .get_rate       = get_rate_ipg,
 468 };
 469
 470 static struct clk cpu_clk = {
 471         .parent = &mpll_main2_clk,
 472         .set_parent = clk_cpu_set_parent,
 473         .round_rate = round_rate_cpu,
 474         .get_rate = get_rate_cpu,
 475         .set_rate = set_rate_cpu,
 476 };
 477
 478 static struct clk spll_clk = {
 479         .parent = &ckih_clk,
 480         .get_rate = get_rate_spll,
 481         .enable = clk_spll_enable,
 482         .disable = clk_spll_disable,
 483 };
 484
 485 /*
 486  * the low frequency external clock reference
 487  * Default case is 32.768kHz.
 488  */
 489 static struct clk ckil_clk = {
 490         .get_rate = get_rate_low_reference,
 491 };
 492
 493 /* Output of frequency pre multiplier */
 494 static struct clk fpm_clk = {
 495         .parent = &ckil_clk,
 496         .get_rate = get_rate_fpm,
 497 };
 498
 499 #define PCCR0 CCM_PCCR0
 500 #define PCCR1 CCM_PCCR1
 501
 502 #define DEFINE_CLOCK(name, i, er, es, gr, s, p)         \
 503         static struct clk name = {                      \
 504                 .id             = i,                    \
 505                 .enable_reg     = er,                   \
 506                 .enable_shift   = es,                   \
 507                 .get_rate       = gr,                   \
 508                 .enable         = clk_pccr_enable,      \
 509                 .disable        = clk_pccr_disable,     \
 510                 .secondary      = s,                    \
 511                 .parent         = p,                    \
 512         }
 513
 514 #define DEFINE_CLOCK1(name, i, er, es, getsetround, s, p)       \
 515         static struct clk name = {                              \
 516                 .id             = i,                            \
 517                 .enable_reg     = er,                           \
 518                 .enable_shift   = es,                           \
 519                 .get_rate       = get_rate_##getsetround,       \
 520                 .set_rate       = set_rate_##getsetround,       \
 521                 .round_rate     = round_rate_##getsetround,     \
 522                 .enable         = clk_pccr_enable,              \
 523                 .disable        = clk_pccr_disable,             \
 524                 .secondary      = s,                            \
 525                 .parent         = p,                            \
 526         }
 527
 528 /* Forward declaration to keep the following list in order */
 529 static struct clk slcdc_clk1, sahara2_clk1, rtic_clk1, fec_clk1, emma_clk1,
 530                   dma_clk1, lcdc_clk2, vpu_clk1;
 531
 532 /* All clocks we can gate through PCCRx in the order of PCCRx bits */
 533 DEFINE_CLOCK(ssi2_clk1,    1, PCCR0,  0, NULL, NULL, &ipg_clk);
 534 DEFINE_CLOCK(ssi1_clk1,    0, PCCR0,  1, NULL, NULL, &ipg_clk);
 535 DEFINE_CLOCK(slcdc_clk,    0, PCCR0,  2, NULL, &slcdc_clk1, &ahb_clk);
 536 DEFINE_CLOCK(sdhc3_clk1,   0, PCCR0,  3, NULL, NULL, &ipg_clk);
 537 DEFINE_CLOCK(sdhc2_clk1,   0, PCCR0,  4, NULL, NULL, &ipg_clk);
 538 DEFINE_CLOCK(sdhc1_clk1,   0, PCCR0,  5, NULL, NULL, &ipg_clk);
 539 DEFINE_CLOCK(scc_clk,      0, PCCR0,  6, NULL, NULL, &ipg_clk);
 540 DEFINE_CLOCK(sahara2_clk,  0, PCCR0,  7, NULL, &sahara2_clk1, &ahb_clk);
 541 DEFINE_CLOCK(rtic_clk,     0, PCCR0,  8, NULL, &rtic_clk1, &ahb_clk);
 542 DEFINE_CLOCK(rtc_clk,      0, PCCR0,  9, NULL, NULL, &ipg_clk);
 543 DEFINE_CLOCK(pwm_clk1,     0, PCCR0, 11, NULL, NULL, &ipg_clk);
 544 DEFINE_CLOCK(owire_clk,    0, PCCR0, 12, NULL, NULL, &ipg_clk);
 545 DEFINE_CLOCK(mstick_clk1,  0, PCCR0, 13, NULL, NULL, &ipg_clk);
 546 DEFINE_CLOCK(lcdc_clk1,    0, PCCR0, 14, NULL, &lcdc_clk2, &ipg_clk);
 547 DEFINE_CLOCK(kpp_clk,      0, PCCR0, 15, NULL, NULL, &ipg_clk);
 548 DEFINE_CLOCK(iim_clk,      0, PCCR0, 16, NULL, NULL, &ipg_clk);
 549 DEFINE_CLOCK(i2c2_clk,     1, PCCR0, 17, NULL, NULL, &ipg_clk);
 550 DEFINE_CLOCK(i2c1_clk,     0, PCCR0, 18, NULL, NULL, &ipg_clk);
 551 DEFINE_CLOCK(gpt6_clk1,    0, PCCR0, 29, NULL, NULL, &ipg_clk);
 552 DEFINE_CLOCK(gpt5_clk1,    0, PCCR0, 20, NULL, NULL, &ipg_clk);
 553 DEFINE_CLOCK(gpt4_clk1,    0, PCCR0, 21, NULL, NULL, &ipg_clk);
 554 DEFINE_CLOCK(gpt3_clk1,    0, PCCR0, 22, NULL, NULL, &ipg_clk);
 555 DEFINE_CLOCK(gpt2_clk1,    0, PCCR0, 23, NULL, NULL, &ipg_clk);
 556 DEFINE_CLOCK(gpt1_clk1,    0, PCCR0, 24, NULL, NULL, &ipg_clk);
 557 DEFINE_CLOCK(gpio_clk,     0, PCCR0, 25, NULL, NULL, &ipg_clk);
 558 DEFINE_CLOCK(fec_clk,      0, PCCR0, 26, NULL, &fec_clk1, &ahb_clk);
 559 DEFINE_CLOCK(emma_clk,     0, PCCR0, 27, NULL, &emma_clk1, &ahb_clk);
 560 DEFINE_CLOCK(dma_clk,      0, PCCR0, 28, NULL, &dma_clk1, &ahb_clk);
 561 DEFINE_CLOCK(cspi13_clk1,  0, PCCR0, 29, NULL, NULL, &ipg_clk);
 562 DEFINE_CLOCK(cspi2_clk1,   0, PCCR0, 30, NULL, NULL, &ipg_clk);
 563 DEFINE_CLOCK(cspi1_clk1,   0, PCCR0, 31, NULL, NULL, &ipg_clk);
 564
 565 DEFINE_CLOCK(mstick_clk,   0, PCCR1,  2, NULL, &mstick_clk1, &ipg_clk);
 566 DEFINE_CLOCK(nfc_clk,      0, PCCR1,  3, get_rate_nfc, NULL, &cpu_clk);
 567 DEFINE_CLOCK(ssi2_clk,     1, PCCR1,  4, get_rate_ssi2, &ssi2_clk1, &mpll_main2_clk);
 568 DEFINE_CLOCK(ssi1_clk,     0, PCCR1,  5, get_rate_ssi1, &ssi1_clk1, &mpll_main2_clk);
 569 DEFINE_CLOCK(vpu_clk,      0, PCCR1,  6, get_rate_vpu, &vpu_clk1, &mpll_main2_clk);
 570 DEFINE_CLOCK1(per4_clk,    3, PCCR1,  7, per, NULL, &mpll_main2_clk);
 571 DEFINE_CLOCK1(per3_clk,    2, PCCR1,  8, per, NULL, &mpll_main2_clk);
 572 DEFINE_CLOCK1(per2_clk,    1, PCCR1,  9, per, NULL, &mpll_main2_clk);
 573 DEFINE_CLOCK1(per1_clk,    0, PCCR1, 10, per, NULL, &mpll_main2_clk);
 574 DEFINE_CLOCK(usb_clk1,     0, PCCR1, 11, NULL, NULL, &ahb_clk);
 575 DEFINE_CLOCK(slcdc_clk1,   0, PCCR1, 12, NULL, NULL, &ahb_clk);
 576 DEFINE_CLOCK(sahara2_clk1, 0, PCCR1, 13, NULL, NULL, &ahb_clk);
 577 DEFINE_CLOCK(rtic_clk1,    0, PCCR1, 14, NULL, NULL, &ahb_clk);
 578 DEFINE_CLOCK(lcdc_clk2,    0, PCCR1, 15, NULL, NULL, &ahb_clk);
 579 DEFINE_CLOCK(vpu_clk1,     0, PCCR1, 16, NULL, NULL, &ahb_clk);
 580 DEFINE_CLOCK(fec_clk1,     0, PCCR1, 17, NULL, NULL, &ahb_clk);
 581 DEFINE_CLOCK(emma_clk1,    0, PCCR1, 18, NULL, NULL, &ahb_clk);
 582 DEFINE_CLOCK(emi_clk,      0, PCCR1, 19, NULL, NULL, &ahb_clk);
 583 DEFINE_CLOCK(dma_clk1,     0, PCCR1, 20, NULL, NULL, &ahb_clk);
 584 DEFINE_CLOCK(csi_clk1,     0, PCCR1, 21, NULL, NULL, &ahb_clk);
 585 DEFINE_CLOCK(brom_clk,     0, PCCR1, 22, NULL, NULL, &ahb_clk);
 586 DEFINE_CLOCK(pata_clk,      0, PCCR1, 23, NULL, NULL, &ahb_clk);
 587 DEFINE_CLOCK(wdog_clk,     0, PCCR1, 24, NULL, NULL, &ipg_clk);
 588 DEFINE_CLOCK(usb_clk,      0, PCCR1, 25, get_rate_usb, &usb_clk1, &spll_clk);
 589 DEFINE_CLOCK(uart6_clk1,   0, PCCR1, 26, NULL, NULL, &ipg_clk);
 590 DEFINE_CLOCK(uart5_clk1,   0, PCCR1, 27, NULL, NULL, &ipg_clk);
 591 DEFINE_CLOCK(uart4_clk1,   0, PCCR1, 28, NULL, NULL, &ipg_clk);
 592 DEFINE_CLOCK(uart3_clk1,   0, PCCR1, 29, NULL, NULL, &ipg_clk);
 593 DEFINE_CLOCK(uart2_clk1,   0, PCCR1, 30, NULL, NULL, &ipg_clk);
 594 DEFINE_CLOCK(uart1_clk1,   0, PCCR1, 31, NULL, NULL, &ipg_clk);
 595
 596 /* Clocks we cannot directly gate, but drivers need their rates */
 597 DEFINE_CLOCK(cspi1_clk,    0, NULL,   0, NULL, &cspi1_clk1, &per2_clk);
 598 DEFINE_CLOCK(cspi2_clk,    1, NULL,   0, NULL, &cspi2_clk1, &per2_clk);
 599 DEFINE_CLOCK(cspi3_clk,    2, NULL,   0, NULL, &cspi13_clk1, &per2_clk);
 600 DEFINE_CLOCK(sdhc1_clk,    0, NULL,   0, NULL, &sdhc1_clk1, &per2_clk);
 601 DEFINE_CLOCK(sdhc2_clk,    1, NULL,   0, NULL, &sdhc2_clk1, &per2_clk);
 602 DEFINE_CLOCK(sdhc3_clk,    2, NULL,   0, NULL, &sdhc3_clk1, &per2_clk);
 603 DEFINE_CLOCK(pwm_clk,      0, NULL,   0, NULL, &pwm_clk1, &per1_clk);
 604 DEFINE_CLOCK(gpt1_clk,     0, NULL,   0, NULL, &gpt1_clk1, &per1_clk);
 605 DEFINE_CLOCK(gpt2_clk,     1, NULL,   0, NULL, &gpt2_clk1, &per1_clk);
 606 DEFINE_CLOCK(gpt3_clk,     2, NULL,   0, NULL, &gpt3_clk1, &per1_clk);
 607 DEFINE_CLOCK(gpt4_clk,     3, NULL,   0, NULL, &gpt4_clk1, &per1_clk);
 608 DEFINE_CLOCK(gpt5_clk,     4, NULL,   0, NULL, &gpt5_clk1, &per1_clk);
 609 DEFINE_CLOCK(gpt6_clk,     5, NULL,   0, NULL, &gpt6_clk1, &per1_clk);
 610 DEFINE_CLOCK(uart1_clk,    0, NULL,   0, NULL, &uart1_clk1, &per1_clk);
 611 DEFINE_CLOCK(uart2_clk,    1, NULL,   0, NULL, &uart2_clk1, &per1_clk);
 612 DEFINE_CLOCK(uart3_clk,    2, NULL,   0, NULL, &uart3_clk1, &per1_clk);
 613 DEFINE_CLOCK(uart4_clk,    3, NULL,   0, NULL, &uart4_clk1, &per1_clk);
 614 DEFINE_CLOCK(uart5_clk,    4, NULL,   0, NULL, &uart5_clk1, &per1_clk);
 615 DEFINE_CLOCK(uart6_clk,    5, NULL,   0, NULL, &uart6_clk1, &per1_clk);
 616 DEFINE_CLOCK1(lcdc_clk,    0, NULL,   0, parent, &lcdc_clk1, &per3_clk);
 617 DEFINE_CLOCK1(csi_clk,     0, NULL,   0, parent, &csi_clk1, &per4_clk);
 618
 619 #define _REGISTER_CLOCK(d, n, c) \
 620         { \
 621                 .dev_id = d, \
 622                 .con_id = n, \
 623                 .clk = &c, \
 624         },
 625
 626 static struct clk_lookup lookups[] = {
 627         /* i.mx27 has the i.mx21 type uart */
 628         _REGISTER_CLOCK("imx21-uart.0", NULL, uart1_clk)
 629         _REGISTER_CLOCK("imx21-uart.1", NULL, uart2_clk)
 630         _REGISTER_CLOCK("imx21-uart.2", NULL, uart3_clk)
 631         _REGISTER_CLOCK("imx21-uart.3", NULL, uart4_clk)
 632         _REGISTER_CLOCK("imx21-uart.4", NULL, uart5_clk)
 633         _REGISTER_CLOCK("imx21-uart.5", NULL, uart6_clk)
 634         _REGISTER_CLOCK(NULL, "gpt1", gpt1_clk)
 635         _REGISTER_CLOCK(NULL, "gpt2", gpt2_clk)
 636         _REGISTER_CLOCK(NULL, "gpt3", gpt3_clk)
 637         _REGISTER_CLOCK(NULL, "gpt4", gpt4_clk)
 638         _REGISTER_CLOCK(NULL, "gpt5", gpt5_clk)
 639         _REGISTER_CLOCK(NULL, "gpt6", gpt6_clk)
 640         _REGISTER_CLOCK("mxc_pwm.0", NULL, pwm_clk)
 641         _REGISTER_CLOCK("mxc-mmc.0", NULL, sdhc1_clk)
 642         _REGISTER_CLOCK("mxc-mmc.1", NULL, sdhc2_clk)
 643         _REGISTER_CLOCK("mxc-mmc.2", NULL, sdhc3_clk)
 644         _REGISTER_CLOCK("imx27-cspi.0", NULL, cspi1_clk)
 645         _REGISTER_CLOCK("imx27-cspi.1", NULL, cspi2_clk)
 646         _REGISTER_CLOCK("imx27-cspi.2", NULL, cspi3_clk)
 647         _REGISTER_CLOCK("imx-fb.0", NULL, lcdc_clk)
 648         _REGISTER_CLOCK("mx2-camera.0", NULL, csi_clk)
 649         _REGISTER_CLOCK("fsl-usb2-udc", "usb", usb_clk)
 650         _REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", usb_clk1)
 651         _REGISTER_CLOCK("mxc-ehci.0", "usb", usb_clk)
 652         _REGISTER_CLOCK("mxc-ehci.0", "usb_ahb", usb_clk1)
 653         _REGISTER_CLOCK("mxc-ehci.1", "usb", usb_clk)
 654         _REGISTER_CLOCK("mxc-ehci.1", "usb_ahb", usb_clk1)
 655         _REGISTER_CLOCK("mxc-ehci.2", "usb", usb_clk)
 656         _REGISTER_CLOCK("mxc-ehci.2", "usb_ahb", usb_clk1)
 657         _REGISTER_CLOCK("imx-ssi.0", NULL, ssi1_clk)
 658         _REGISTER_CLOCK("imx-ssi.1", NULL, ssi2_clk)
 659         _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
 660         _REGISTER_CLOCK(NULL, "vpu", vpu_clk)
 661         _REGISTER_CLOCK(NULL, "dma", dma_clk)
 662         _REGISTER_CLOCK(NULL, "rtic", rtic_clk)
 663         _REGISTER_CLOCK(NULL, "brom", brom_clk)
 664         _REGISTER_CLOCK(NULL, "emma", emma_clk)
 665         _REGISTER_CLOCK(NULL, "slcdc", slcdc_clk)
 666         _REGISTER_CLOCK("imx27-fec.0", NULL, fec_clk)
 667         _REGISTER_CLOCK(NULL, "emi", emi_clk)
 668         _REGISTER_CLOCK(NULL, "sahara2", sahara2_clk)
 669         _REGISTER_CLOCK("pata_imx", NULL, pata_clk)
 670         _REGISTER_CLOCK(NULL, "mstick", mstick_clk)
 671         _REGISTER_CLOCK("imx2-wdt.0", NULL, wdog_clk)
 672         _REGISTER_CLOCK(NULL, "gpio", gpio_clk)
 673         _REGISTER_CLOCK("imx-i2c.0", NULL, i2c1_clk)
 674         _REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
 675         _REGISTER_CLOCK(NULL, "iim", iim_clk)
 676         _REGISTER_CLOCK(NULL, "kpp", kpp_clk)
 677         _REGISTER_CLOCK("mxc_w1.0", NULL, owire_clk)
 678         _REGISTER_CLOCK(NULL, "rtc", rtc_clk)
 679         _REGISTER_CLOCK(NULL, "scc", scc_clk)
 680 };
 681
 682 /* Adjust the clock path for TO2 and later */
 683 static void __init to2_adjust_clocks(void)
 684 {
 685         unsigned long cscr = __raw_readl(CCM_CSCR);
 686
 687         if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
 688                 if (cscr & CCM_CSCR_ARM_SRC)
 689                         cpu_clk.parent = &mpll_main1_clk;
 690
 691                 if (!(cscr & CCM_CSCR_SSI2))
 692                         ssi1_clk.parent = &spll_clk;
 693
 694                 if (!(cscr & CCM_CSCR_SSI1))
 695                         ssi1_clk.parent = &spll_clk;
 696
 697                 if (!(cscr & CCM_CSCR_VPU))
 698                         vpu_clk.parent = &spll_clk;
 699         } else {
 700                 cpu_clk.parent = &mpll_clk;
 701                 cpu_clk.set_parent = NULL;
 702                 cpu_clk.round_rate = NULL;
 703                 cpu_clk.set_rate = NULL;
 704                 ahb_clk.parent = &mpll_clk;
 705
 706                 per1_clk.parent = &mpll_clk;
 707                 per2_clk.parent = &mpll_clk;
 708                 per3_clk.parent = &mpll_clk;
 709                 per4_clk.parent = &mpll_clk;
 710
 711                 ssi1_clk.parent = &mpll_clk;
 712                 ssi2_clk.parent = &mpll_clk;
 713
 714                 vpu_clk.parent = &mpll_clk;
 715         }
 716 }
 717
 718 /*
 719  * must be called very early to get information about the
 720  * available clock rate when the timer framework starts
 721  */
 722 int __init mx27_clocks_init(unsigned long fref)
 723 {
 724         u32 cscr = __raw_readl(CCM_CSCR);
 725
 726         external_high_reference = fref;
 727
 728         /* detect clock reference for both system PLLs */
 729         if (cscr & CCM_CSCR_MCU)
 730                 mpll_clk.parent = &ckih_clk;
 731         else
 732                 mpll_clk.parent = &fpm_clk;
 733
 734         if (cscr & CCM_CSCR_SP)
 735                 spll_clk.parent = &ckih_clk;
 736         else
 737                 spll_clk.parent = &fpm_clk;
 738
 739         to2_adjust_clocks();
 740
 741         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 742
 743         /* Turn off all clocks we do not need */
 744         __raw_writel(0, CCM_PCCR0);
 745         __raw_writel((1 << 10) | (1 << 19), CCM_PCCR1);
 746
 747         spll_clk.disable(&spll_clk);
 748
 749         /* enable basic clocks */
 750         clk_enable(&per1_clk);
 751         clk_enable(&gpio_clk);
 752         clk_enable(&emi_clk);
 753         clk_enable(&iim_clk);
 754
 755 #if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_ICEDCC)
 756         clk_enable(&uart1_clk);
 757 #endif
 758
 759         mxc_timer_init(&gpt1_clk, MX27_IO_ADDRESS(MX27_GPT1_BASE_ADDR),
 760                         MX27_INT_GPT1);
 761
 762         return 0;
 763 }
 764