git.oblomov.eu Git - linux-2.6/blob - arch/arm/mach-s3c2443/clock.c

   1 /* linux/arch/arm/mach-s3c2443/clock.c
   2  *
   3  * Copyright (c) 2007 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * S3C2443 Clock control support
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/list.h>
  27 #include <linux/errno.h>
  28 #include <linux/err.h>
  29 #include <linux/sysdev.h>
  30 #include <linux/clk.h>
  31 #include <linux/mutex.h>
  32 #include <linux/delay.h>
  33 #include <linux/serial_core.h>
  34 #include <linux/io.h>
  35
  36 #include <asm/mach/map.h>
  37
  38 #include <mach/hardware.h>
  39
  40 #include <mach/regs-s3c2443-clock.h>
  41
  42 #include <plat/s3c2443.h>
  43 #include <plat/clock.h>
  44 #include <plat/cpu.h>
  45
  46 /* We currently have to assume that the system is running
  47  * from the XTPll input, and that all ***REFCLKs are being
  48  * fed from it, as we cannot read the state of OM[4] from
  49  * software.
  50  *
  51  * It would be possible for each board initialisation to
  52  * set the correct muxing at initialisation
  53 */
  54
  55 static int s3c2443_clkcon_enable_h(struct clk *clk, int enable)
  56 {
  57         unsigned int clocks = clk->ctrlbit;
  58         unsigned long clkcon;
  59
  60         clkcon = __raw_readl(S3C2443_HCLKCON);
  61
  62         if (enable)
  63                 clkcon |= clocks;
  64         else
  65                 clkcon &= ~clocks;
  66
  67         __raw_writel(clkcon, S3C2443_HCLKCON);
  68
  69         return 0;
  70 }
  71
  72 static int s3c2443_clkcon_enable_p(struct clk *clk, int enable)
  73 {
  74         unsigned int clocks = clk->ctrlbit;
  75         unsigned long clkcon;
  76
  77         clkcon = __raw_readl(S3C2443_PCLKCON);
  78
  79         if (enable)
  80                 clkcon |= clocks;
  81         else
  82                 clkcon &= ~clocks;
  83
  84         __raw_writel(clkcon, S3C2443_PCLKCON);
  85
  86         return 0;
  87 }
  88
  89 static int s3c2443_clkcon_enable_s(struct clk *clk, int enable)
  90 {
  91         unsigned int clocks = clk->ctrlbit;
  92         unsigned long clkcon;
  93
  94         clkcon = __raw_readl(S3C2443_SCLKCON);
  95
  96         if (enable)
  97                 clkcon |= clocks;
  98         else
  99                 clkcon &= ~clocks;
 100
 101         __raw_writel(clkcon, S3C2443_SCLKCON);
 102
 103         return 0;
 104 }
 105
 106 static unsigned long s3c2443_roundrate_clksrc(struct clk *clk,
 107                                               unsigned long rate,
 108                                               unsigned int max)
 109 {
 110         unsigned long parent_rate = clk_get_rate(clk->parent);
 111         int div;
 112
 113         if (rate > parent_rate)
 114                 return parent_rate;
 115
 116         /* note, we remove the +/- 1 calculations as they cancel out */
 117
 118         div = (rate / parent_rate);
 119
 120         if (div < 1)
 121                 div = 1;
 122         else if (div > max)
 123                 div = max;
 124
 125         return parent_rate / div;
 126 }
 127
 128 static unsigned long s3c2443_roundrate_clksrc4(struct clk *clk,
 129                                                unsigned long rate)
 130 {
 131         return s3c2443_roundrate_clksrc(clk, rate, 4);
 132 }
 133
 134 static unsigned long s3c2443_roundrate_clksrc16(struct clk *clk,
 135                                                 unsigned long rate)
 136 {
 137         return s3c2443_roundrate_clksrc(clk, rate, 16);
 138 }
 139
 140 static unsigned long s3c2443_roundrate_clksrc256(struct clk *clk,
 141                                                  unsigned long rate)
 142 {
 143         return s3c2443_roundrate_clksrc(clk, rate, 256);
 144 }
 145
 146 /* clock selections */
 147
 148 /* CPU EXTCLK input */
 149 static struct clk clk_ext = {
 150         .name           = "ext",
 151         .id             = -1,
 152 };
 153
 154 static struct clk clk_mpllref = {
 155         .name           = "mpllref",
 156         .parent         = &clk_xtal,
 157         .id             = -1,
 158 };
 159
 160 #if 0
 161 static struct clk clk_mpll = {
 162         .name           = "mpll",
 163         .parent         = &clk_mpllref,
 164         .id             = -1,
 165 };
 166 #endif
 167
 168 static struct clk clk_epllref;
 169
 170 static struct clk clk_epll = {
 171         .name           = "epll",
 172         .parent         = &clk_epllref,
 173         .id             = -1,
 174 };
 175
 176 static struct clk clk_i2s_ext = {
 177         .name           = "i2s-ext",
 178         .id             = -1,
 179 };
 180
 181 static int s3c2443_setparent_epllref(struct clk *clk, struct clk *parent)
 182 {
 183         unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
 184
 185         clksrc &= ~S3C2443_CLKSRC_EPLLREF_MASK;
 186
 187         if (parent == &clk_xtal)
 188                 clksrc |= S3C2443_CLKSRC_EPLLREF_XTAL;
 189         else if (parent == &clk_ext)
 190                 clksrc |= S3C2443_CLKSRC_EPLLREF_EXTCLK;
 191         else if (parent != &clk_mpllref)
 192                 return -EINVAL;
 193
 194         __raw_writel(clksrc, S3C2443_CLKSRC);
 195         clk->parent = parent;
 196
 197         return 0;
 198 }
 199
 200 static struct clk clk_epllref = {
 201         .name           = "epllref",
 202         .id             = -1,
 203         .set_parent     = s3c2443_setparent_epllref,
 204 };
 205
 206 static unsigned long s3c2443_getrate_mdivclk(struct clk *clk)
 207 {
 208         unsigned long parent_rate = clk_get_rate(clk->parent);
 209         unsigned long div = __raw_readl(S3C2443_CLKDIV0);
 210
 211         div  &= S3C2443_CLKDIV0_EXTDIV_MASK;
 212         div >>= (S3C2443_CLKDIV0_EXTDIV_SHIFT-1);       /* x2 */
 213
 214         return parent_rate / (div + 1);
 215 }
 216
 217 static struct clk clk_mdivclk = {
 218         .name           = "mdivclk",
 219         .parent         = &clk_mpllref,
 220         .id             = -1,
 221         .get_rate       = s3c2443_getrate_mdivclk,
 222 };
 223
 224 static int s3c2443_setparent_msysclk(struct clk *clk, struct clk *parent)
 225 {
 226         unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
 227
 228         clksrc &= ~(S3C2443_CLKSRC_MSYSCLK_MPLL |
 229                     S3C2443_CLKSRC_EXTCLK_DIV);
 230
 231         if (parent == &clk_mpll)
 232                 clksrc |= S3C2443_CLKSRC_MSYSCLK_MPLL;
 233         else if (parent == &clk_mdivclk)
 234                 clksrc |= S3C2443_CLKSRC_EXTCLK_DIV;
 235         else if (parent != &clk_mpllref)
 236                 return -EINVAL;
 237
 238         __raw_writel(clksrc, S3C2443_CLKSRC);
 239         clk->parent = parent;
 240
 241         return 0;
 242 }
 243
 244 static struct clk clk_msysclk = {
 245         .name           = "msysclk",
 246         .parent         = &clk_xtal,
 247         .id             = -1,
 248         .set_parent     = s3c2443_setparent_msysclk,
 249 };
 250
 251 /* armdiv
 252  *
 253  * this clock is sourced from msysclk and can have a number of
 254  * divider values applied to it to then be fed into armclk.
 255 */
 256
 257 static struct clk clk_armdiv = {
 258         .name           = "armdiv",
 259         .id             = -1,
 260         .parent         = &clk_msysclk,
 261 };
 262
 263 /* armclk
 264  *
 265  * this is the clock fed into the ARM core itself, either from
 266  * armdiv or from hclk.
 267  */
 268
 269 static int s3c2443_setparent_armclk(struct clk *clk, struct clk *parent)
 270 {
 271         unsigned long clkdiv0;
 272
 273         clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
 274
 275         if (parent == &clk_armdiv)
 276                 clkdiv0 &= ~S3C2443_CLKDIV0_DVS;
 277         else if (parent == &clk_h)
 278                 clkdiv0 |= S3C2443_CLKDIV0_DVS;
 279         else
 280                 return -EINVAL;
 281
 282         __raw_writel(clkdiv0, S3C2443_CLKDIV0);
 283         return 0;
 284 }
 285
 286 static struct clk clk_arm = {
 287         .name           = "armclk",
 288         .id             = -1,
 289         .set_parent     = s3c2443_setparent_armclk,
 290 };
 291
 292 /* esysclk
 293  *
 294  * this is sourced from either the EPLL or the EPLLref clock
 295 */
 296
 297 static int s3c2443_setparent_esysclk(struct clk *clk, struct clk *parent)
 298 {
 299         unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
 300
 301         if (parent == &clk_epll)
 302                 clksrc |= S3C2443_CLKSRC_ESYSCLK_EPLL;
 303         else if (parent == &clk_epllref)
 304                 clksrc &= ~S3C2443_CLKSRC_ESYSCLK_EPLL;
 305         else
 306                 return -EINVAL;
 307
 308         __raw_writel(clksrc, S3C2443_CLKSRC);
 309         clk->parent = parent;
 310
 311         return 0;
 312 }
 313
 314 static struct clk clk_esysclk = {
 315         .name           = "esysclk",
 316         .parent         = &clk_epll,
 317         .id             = -1,
 318         .set_parent     = s3c2443_setparent_esysclk,
 319 };
 320
 321 /* uartclk
 322  *
 323  * UART baud-rate clock sourced from esysclk via a divisor
 324 */
 325
 326 static unsigned long s3c2443_getrate_uart(struct clk *clk)
 327 {
 328         unsigned long parent_rate = clk_get_rate(clk->parent);
 329         unsigned long div = __raw_readl(S3C2443_CLKDIV1);
 330
 331         div &= S3C2443_CLKDIV1_UARTDIV_MASK;
 332         div >>= S3C2443_CLKDIV1_UARTDIV_SHIFT;
 333
 334         return parent_rate / (div + 1);
 335 }
 336
 337
 338 static int s3c2443_setrate_uart(struct clk *clk, unsigned long rate)
 339 {
 340         unsigned long parent_rate = clk_get_rate(clk->parent);
 341         unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
 342
 343         rate = s3c2443_roundrate_clksrc16(clk, rate);
 344         rate = parent_rate / rate;
 345
 346         clkdivn &= ~S3C2443_CLKDIV1_UARTDIV_MASK;
 347         clkdivn |= (rate - 1) << S3C2443_CLKDIV1_UARTDIV_SHIFT;
 348
 349         __raw_writel(clkdivn, S3C2443_CLKDIV1);
 350         return 0;
 351 }
 352
 353 static struct clk clk_uart = {
 354         .name           = "uartclk",
 355         .id             = -1,
 356         .parent         = &clk_esysclk,
 357         .get_rate       = s3c2443_getrate_uart,
 358         .set_rate       = s3c2443_setrate_uart,
 359         .round_rate     = s3c2443_roundrate_clksrc16,
 360 };
 361
 362 /* hsspi
 363  *
 364  * high-speed spi clock, sourced from esysclk
 365 */
 366
 367 static unsigned long s3c2443_getrate_hsspi(struct clk *clk)
 368 {
 369         unsigned long parent_rate = clk_get_rate(clk->parent);
 370         unsigned long div = __raw_readl(S3C2443_CLKDIV1);
 371
 372         div &= S3C2443_CLKDIV1_HSSPIDIV_MASK;
 373         div >>= S3C2443_CLKDIV1_HSSPIDIV_SHIFT;
 374
 375         return parent_rate / (div + 1);
 376 }
 377
 378
 379 static int s3c2443_setrate_hsspi(struct clk *clk, unsigned long rate)
 380 {
 381         unsigned long parent_rate = clk_get_rate(clk->parent);
 382         unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
 383
 384         rate = s3c2443_roundrate_clksrc4(clk, rate);
 385         rate = parent_rate / rate;
 386
 387         clkdivn &= ~S3C2443_CLKDIV1_HSSPIDIV_MASK;
 388         clkdivn |= (rate - 1) << S3C2443_CLKDIV1_HSSPIDIV_SHIFT;
 389
 390         __raw_writel(clkdivn, S3C2443_CLKDIV1);
 391         return 0;
 392 }
 393
 394 static struct clk clk_hsspi = {
 395         .name           = "hsspi",
 396         .id             = -1,
 397         .parent         = &clk_esysclk,
 398         .ctrlbit        = S3C2443_SCLKCON_HSSPICLK,
 399         .enable         = s3c2443_clkcon_enable_s,
 400         .get_rate       = s3c2443_getrate_hsspi,
 401         .set_rate       = s3c2443_setrate_hsspi,
 402         .round_rate     = s3c2443_roundrate_clksrc4,
 403 };
 404
 405 /* usbhost
 406  *
 407  * usb host bus-clock, usually 48MHz to provide USB bus clock timing
 408 */
 409
 410 static unsigned long s3c2443_getrate_usbhost(struct clk *clk)
 411 {
 412         unsigned long parent_rate = clk_get_rate(clk->parent);
 413         unsigned long div = __raw_readl(S3C2443_CLKDIV1);
 414
 415         div &= S3C2443_CLKDIV1_USBHOSTDIV_MASK;
 416         div >>= S3C2443_CLKDIV1_USBHOSTDIV_SHIFT;
 417
 418         return parent_rate / (div + 1);
 419 }
 420
 421 static int s3c2443_setrate_usbhost(struct clk *clk, unsigned long rate)
 422 {
 423         unsigned long parent_rate = clk_get_rate(clk->parent);
 424         unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
 425
 426         rate = s3c2443_roundrate_clksrc4(clk, rate);
 427         rate = parent_rate / rate;
 428
 429         clkdivn &= ~S3C2443_CLKDIV1_USBHOSTDIV_MASK;
 430         clkdivn |= (rate - 1) << S3C2443_CLKDIV1_USBHOSTDIV_SHIFT;
 431
 432         __raw_writel(clkdivn, S3C2443_CLKDIV1);
 433         return 0;
 434 }
 435
 436 static struct clk clk_usb_bus_host = {
 437         .name           = "usb-bus-host-parent",
 438         .id             = -1,
 439         .parent         = &clk_esysclk,
 440         .ctrlbit        = S3C2443_SCLKCON_USBHOST,
 441         .enable         = s3c2443_clkcon_enable_s,
 442         .get_rate       = s3c2443_getrate_usbhost,
 443         .set_rate       = s3c2443_setrate_usbhost,
 444         .round_rate     = s3c2443_roundrate_clksrc4,
 445 };
 446
 447 /* clk_hsmcc_div
 448  *
 449  * this clock is sourced from epll, and is fed through a divider,
 450  * to a mux controlled by sclkcon where either it or a extclk can
 451  * be fed to the hsmmc block
 452 */
 453
 454 static unsigned long s3c2443_getrate_hsmmc_div(struct clk *clk)
 455 {
 456         unsigned long parent_rate = clk_get_rate(clk->parent);
 457         unsigned long div = __raw_readl(S3C2443_CLKDIV1);
 458
 459         div &= S3C2443_CLKDIV1_HSMMCDIV_MASK;
 460         div >>= S3C2443_CLKDIV1_HSMMCDIV_SHIFT;
 461
 462         return parent_rate / (div + 1);
 463 }
 464
 465 static int s3c2443_setrate_hsmmc_div(struct clk *clk, unsigned long rate)
 466 {
 467         unsigned long parent_rate = clk_get_rate(clk->parent);
 468         unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
 469
 470         rate = s3c2443_roundrate_clksrc4(clk, rate);
 471         rate = parent_rate / rate;
 472
 473         clkdivn &= ~S3C2443_CLKDIV1_HSMMCDIV_MASK;
 474         clkdivn |= (rate - 1) << S3C2443_CLKDIV1_HSMMCDIV_SHIFT;
 475
 476         __raw_writel(clkdivn, S3C2443_CLKDIV1);
 477         return 0;
 478 }
 479
 480 static struct clk clk_hsmmc_div = {
 481         .name           = "hsmmc-div",
 482         .id             = -1,
 483         .parent         = &clk_esysclk,
 484         .get_rate       = s3c2443_getrate_hsmmc_div,
 485         .set_rate       = s3c2443_setrate_hsmmc_div,
 486         .round_rate     = s3c2443_roundrate_clksrc4,
 487 };
 488
 489 static int s3c2443_setparent_hsmmc(struct clk *clk, struct clk *parent)
 490 {
 491         unsigned long clksrc = __raw_readl(S3C2443_SCLKCON);
 492
 493         clksrc &= ~(S3C2443_SCLKCON_HSMMCCLK_EXT |
 494                     S3C2443_SCLKCON_HSMMCCLK_EPLL);
 495
 496         if (parent == &clk_epll)
 497                 clksrc |= S3C2443_SCLKCON_HSMMCCLK_EPLL;
 498         else if (parent == &clk_ext)
 499                 clksrc |= S3C2443_SCLKCON_HSMMCCLK_EXT;
 500         else
 501                 return -EINVAL;
 502
 503         if (clk->usage > 0) {
 504                 __raw_writel(clksrc, S3C2443_SCLKCON);
 505         }
 506
 507         clk->parent = parent;
 508         return 0;
 509 }
 510
 511 static int s3c2443_enable_hsmmc(struct clk *clk, int enable)
 512 {
 513         return s3c2443_setparent_hsmmc(clk, clk->parent);
 514 }
 515
 516 static struct clk clk_hsmmc = {
 517         .name           = "hsmmc-if",
 518         .id             = -1,
 519         .parent         = &clk_hsmmc_div,
 520         .enable         = s3c2443_enable_hsmmc,
 521         .set_parent     = s3c2443_setparent_hsmmc,
 522 };
 523
 524 /* i2s_eplldiv
 525  *
 526  * this clock is the output from the i2s divisor of esysclk
 527 */
 528
 529 static unsigned long s3c2443_getrate_i2s_eplldiv(struct clk *clk)
 530 {
 531         unsigned long parent_rate = clk_get_rate(clk->parent);
 532         unsigned long div = __raw_readl(S3C2443_CLKDIV1);
 533
 534         div &= S3C2443_CLKDIV1_I2SDIV_MASK;
 535         div >>= S3C2443_CLKDIV1_I2SDIV_SHIFT;
 536
 537         return parent_rate / (div + 1);
 538 }
 539
 540 static int s3c2443_setrate_i2s_eplldiv(struct clk *clk, unsigned long rate)
 541 {
 542         unsigned long parent_rate = clk_get_rate(clk->parent);
 543         unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
 544
 545         rate = s3c2443_roundrate_clksrc16(clk, rate);
 546         rate = parent_rate / rate;
 547
 548         clkdivn &= ~S3C2443_CLKDIV1_I2SDIV_MASK;
 549         clkdivn |= (rate - 1) << S3C2443_CLKDIV1_I2SDIV_SHIFT;
 550
 551         __raw_writel(clkdivn, S3C2443_CLKDIV1);
 552         return 0;
 553 }
 554
 555 static struct clk clk_i2s_eplldiv = {
 556         .name           = "i2s-eplldiv",
 557         .id             = -1,
 558         .parent         = &clk_esysclk,
 559         .get_rate       = s3c2443_getrate_i2s_eplldiv,
 560         .set_rate       = s3c2443_setrate_i2s_eplldiv,
 561         .round_rate     = s3c2443_roundrate_clksrc16,
 562 };
 563
 564 /* i2s-ref
 565  *
 566  * i2s bus reference clock, selectable from external, esysclk or epllref
 567 */
 568
 569 static int s3c2443_setparent_i2s(struct clk *clk, struct clk *parent)
 570 {
 571         unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
 572
 573         clksrc &= ~S3C2443_CLKSRC_I2S_MASK;
 574
 575         if (parent == &clk_epllref)
 576                 clksrc |= S3C2443_CLKSRC_I2S_EPLLREF;
 577         else if (parent == &clk_i2s_ext)
 578                 clksrc |= S3C2443_CLKSRC_I2S_EXT;
 579         else if (parent != &clk_i2s_eplldiv)
 580                 return -EINVAL;
 581
 582         clk->parent = parent;
 583         __raw_writel(clksrc, S3C2443_CLKSRC);
 584
 585         return 0;
 586 }
 587
 588 static struct clk clk_i2s = {
 589         .name           = "i2s-if",
 590         .id             = -1,
 591         .parent         = &clk_i2s_eplldiv,
 592         .ctrlbit        = S3C2443_SCLKCON_I2SCLK,
 593         .enable         = s3c2443_clkcon_enable_s,
 594         .set_parent     = s3c2443_setparent_i2s,
 595 };
 596
 597 /* cam-if
 598  *
 599  * camera interface bus-clock, divided down from esysclk
 600 */
 601
 602 static unsigned long s3c2443_getrate_cam(struct clk *clk)
 603 {
 604         unsigned long parent_rate = clk_get_rate(clk->parent);
 605         unsigned long div = __raw_readl(S3C2443_CLKDIV1);
 606
 607         div  &= S3C2443_CLKDIV1_CAMDIV_MASK;
 608         div >>= S3C2443_CLKDIV1_CAMDIV_SHIFT;
 609
 610         return parent_rate / (div + 1);
 611 }
 612
 613 static int s3c2443_setrate_cam(struct clk *clk, unsigned long rate)
 614 {
 615         unsigned long parent_rate = clk_get_rate(clk->parent);
 616         unsigned long clkdiv1 = __raw_readl(S3C2443_CLKDIV1);
 617
 618         rate = s3c2443_roundrate_clksrc16(clk, rate);
 619         rate = parent_rate / rate;
 620
 621         clkdiv1 &= ~S3C2443_CLKDIV1_CAMDIV_MASK;
 622         clkdiv1 |= (rate - 1) << S3C2443_CLKDIV1_CAMDIV_SHIFT;
 623
 624         __raw_writel(clkdiv1, S3C2443_CLKDIV1);
 625         return 0;
 626 }
 627
 628 static struct clk clk_cam = {
 629         .name           = "camif-upll",         /* same as 2440 name */
 630         .id             = -1,
 631         .parent         = &clk_esysclk,
 632         .ctrlbit        = S3C2443_SCLKCON_CAMCLK,
 633         .enable         = s3c2443_clkcon_enable_s,
 634         .get_rate       = s3c2443_getrate_cam,
 635         .set_rate       = s3c2443_setrate_cam,
 636         .round_rate     = s3c2443_roundrate_clksrc16,
 637 };
 638
 639 /* display-if
 640  *
 641  * display interface clock, divided from esysclk
 642 */
 643
 644 static unsigned long s3c2443_getrate_display(struct clk *clk)
 645 {
 646         unsigned long parent_rate = clk_get_rate(clk->parent);
 647         unsigned long div = __raw_readl(S3C2443_CLKDIV1);
 648
 649         div &= S3C2443_CLKDIV1_DISPDIV_MASK;
 650         div >>= S3C2443_CLKDIV1_DISPDIV_SHIFT;
 651
 652         return parent_rate / (div + 1);
 653 }
 654
 655 static int s3c2443_setrate_display(struct clk *clk, unsigned long rate)
 656 {
 657         unsigned long parent_rate = clk_get_rate(clk->parent);
 658         unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
 659
 660         rate = s3c2443_roundrate_clksrc256(clk, rate);
 661         rate = parent_rate / rate;
 662
 663         clkdivn &= ~S3C2443_CLKDIV1_UARTDIV_MASK;
 664         clkdivn |= (rate - 1) << S3C2443_CLKDIV1_UARTDIV_SHIFT;
 665
 666         __raw_writel(clkdivn, S3C2443_CLKDIV1);
 667         return 0;
 668 }
 669
 670 static struct clk clk_display = {
 671         .name           = "display-if",
 672         .id             = -1,
 673         .parent         = &clk_esysclk,
 674         .ctrlbit        = S3C2443_SCLKCON_DISPCLK,
 675         .enable         = s3c2443_clkcon_enable_s,
 676         .get_rate       = s3c2443_getrate_display,
 677         .set_rate       = s3c2443_setrate_display,
 678         .round_rate     = s3c2443_roundrate_clksrc256,
 679 };
 680
 681 /* prediv
 682  *
 683  * this divides the msysclk down to pass to h/p/etc.
 684  */
 685
 686 static unsigned long s3c2443_prediv_getrate(struct clk *clk)
 687 {
 688         unsigned long rate = clk_get_rate(clk->parent);
 689         unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
 690
 691         clkdiv0 &= S3C2443_CLKDIV0_PREDIV_MASK;
 692         clkdiv0 >>= S3C2443_CLKDIV0_PREDIV_SHIFT;
 693
 694         return rate / (clkdiv0 + 1);
 695 }
 696
 697 static struct clk clk_prediv = {
 698         .name           = "prediv",
 699         .id             = -1,
 700         .parent         = &clk_msysclk,
 701         .get_rate       = s3c2443_prediv_getrate,
 702 };
 703
 704 /* standard clock definitions */
 705
 706 static struct clk init_clocks_disable[] = {
 707         {
 708                 .name           = "nand",
 709                 .id             = -1,
 710                 .parent         = &clk_h,
 711         }, {
 712                 .name           = "sdi",
 713                 .id             = -1,
 714                 .parent         = &clk_p,
 715                 .enable         = s3c2443_clkcon_enable_p,
 716                 .ctrlbit        = S3C2443_PCLKCON_SDI,
 717         }, {
 718                 .name           = "adc",
 719                 .id             = -1,
 720                 .parent         = &clk_p,
 721                 .enable         = s3c2443_clkcon_enable_p,
 722                 .ctrlbit        = S3C2443_PCLKCON_ADC,
 723         }, {
 724                 .name           = "i2c",
 725                 .id             = -1,
 726                 .parent         = &clk_p,
 727                 .enable         = s3c2443_clkcon_enable_p,
 728                 .ctrlbit        = S3C2443_PCLKCON_IIC,
 729         }, {
 730                 .name           = "iis",
 731                 .id             = -1,
 732                 .parent         = &clk_p,
 733                 .enable         = s3c2443_clkcon_enable_p,
 734                 .ctrlbit        = S3C2443_PCLKCON_IIS,
 735         }, {
 736                 .name           = "spi",
 737                 .id             = 0,
 738                 .parent         = &clk_p,
 739                 .enable         = s3c2443_clkcon_enable_p,
 740                 .ctrlbit        = S3C2443_PCLKCON_SPI0,
 741         }, {
 742                 .name           = "spi",
 743                 .id             = 1,
 744                 .parent         = &clk_p,
 745                 .enable         = s3c2443_clkcon_enable_p,
 746                 .ctrlbit        = S3C2443_PCLKCON_SPI1,
 747         }
 748 };
 749
 750 static struct clk init_clocks[] = {
 751         {
 752                 .name           = "dma",
 753                 .id             = 0,
 754                 .parent         = &clk_h,
 755                 .enable         = s3c2443_clkcon_enable_h,
 756                 .ctrlbit        = S3C2443_HCLKCON_DMA0,
 757         }, {
 758                 .name           = "dma",
 759                 .id             = 1,
 760                 .parent         = &clk_h,
 761                 .enable         = s3c2443_clkcon_enable_h,
 762                 .ctrlbit        = S3C2443_HCLKCON_DMA1,
 763         }, {
 764                 .name           = "dma",
 765                 .id             = 2,
 766                 .parent         = &clk_h,
 767                 .enable         = s3c2443_clkcon_enable_h,
 768                 .ctrlbit        = S3C2443_HCLKCON_DMA2,
 769         }, {
 770                 .name           = "dma",
 771                 .id             = 3,
 772                 .parent         = &clk_h,
 773                 .enable         = s3c2443_clkcon_enable_h,
 774                 .ctrlbit        = S3C2443_HCLKCON_DMA3,
 775         }, {
 776                 .name           = "dma",
 777                 .id             = 4,
 778                 .parent         = &clk_h,
 779                 .enable         = s3c2443_clkcon_enable_h,
 780                 .ctrlbit        = S3C2443_HCLKCON_DMA4,
 781         }, {
 782                 .name           = "dma",
 783                 .id             = 5,
 784                 .parent         = &clk_h,
 785                 .enable         = s3c2443_clkcon_enable_h,
 786                 .ctrlbit        = S3C2443_HCLKCON_DMA5,
 787         }, {
 788                 .name           = "lcd",
 789                 .id             = -1,
 790                 .parent         = &clk_h,
 791                 .enable         = s3c2443_clkcon_enable_h,
 792                 .ctrlbit        = S3C2443_HCLKCON_LCDC,
 793         }, {
 794                 .name           = "gpio",
 795                 .id             = -1,
 796                 .parent         = &clk_p,
 797                 .enable         = s3c2443_clkcon_enable_p,
 798                 .ctrlbit        = S3C2443_PCLKCON_GPIO,
 799         }, {
 800                 .name           = "usb-host",
 801                 .id             = -1,
 802                 .parent         = &clk_h,
 803                 .enable         = s3c2443_clkcon_enable_h,
 804                 .ctrlbit        = S3C2443_HCLKCON_USBH,
 805         }, {
 806                 .name           = "usb-device",
 807                 .id             = -1,
 808                 .parent         = &clk_h,
 809                 .enable         = s3c2443_clkcon_enable_h,
 810                 .ctrlbit        = S3C2443_HCLKCON_USBD,
 811         }, {
 812                 .name           = "hsmmc",
 813                 .id             = -1,
 814                 .parent         = &clk_h,
 815                 .enable         = s3c2443_clkcon_enable_h,
 816                 .ctrlbit        = S3C2443_HCLKCON_HSMMC,
 817         }, {
 818                 .name           = "cfc",
 819                 .id             = -1,
 820                 .parent         = &clk_h,
 821                 .enable         = s3c2443_clkcon_enable_h,
 822                 .ctrlbit        = S3C2443_HCLKCON_CFC,
 823         }, {
 824                 .name           = "ssmc",
 825                 .id             = -1,
 826                 .parent         = &clk_h,
 827                 .enable         = s3c2443_clkcon_enable_h,
 828                 .ctrlbit        = S3C2443_HCLKCON_SSMC,
 829         }, {
 830                 .name           = "timers",
 831                 .id             = -1,
 832                 .parent         = &clk_p,
 833                 .enable         = s3c2443_clkcon_enable_p,
 834                 .ctrlbit        = S3C2443_PCLKCON_PWMT,
 835         }, {
 836                 .name           = "uart",
 837                 .id             = 0,
 838                 .parent         = &clk_p,
 839                 .enable         = s3c2443_clkcon_enable_p,
 840                 .ctrlbit        = S3C2443_PCLKCON_UART0,
 841         }, {
 842                 .name           = "uart",
 843                 .id             = 1,
 844                 .parent         = &clk_p,
 845                 .enable         = s3c2443_clkcon_enable_p,
 846                 .ctrlbit        = S3C2443_PCLKCON_UART1,
 847         }, {
 848                 .name           = "uart",
 849                 .id             = 2,
 850                 .parent         = &clk_p,
 851                 .enable         = s3c2443_clkcon_enable_p,
 852                 .ctrlbit        = S3C2443_PCLKCON_UART2,
 853         }, {
 854                 .name           = "uart",
 855                 .id             = 3,
 856                 .parent         = &clk_p,
 857                 .enable         = s3c2443_clkcon_enable_p,
 858                 .ctrlbit        = S3C2443_PCLKCON_UART3,
 859         }, {
 860                 .name           = "rtc",
 861                 .id             = -1,
 862                 .parent         = &clk_p,
 863                 .enable         = s3c2443_clkcon_enable_p,
 864                 .ctrlbit        = S3C2443_PCLKCON_RTC,
 865         }, {
 866                 .name           = "watchdog",
 867                 .id             = -1,
 868                 .parent         = &clk_p,
 869                 .ctrlbit        = S3C2443_PCLKCON_WDT,
 870         }, {
 871                 .name           = "usb-bus-host",
 872                 .id             = -1,
 873                 .parent         = &clk_usb_bus_host,
 874         }, {
 875                 .name           = "ac97",
 876                 .id             = -1,
 877                 .parent         = &clk_p,
 878                 .ctrlbit        = S3C2443_PCLKCON_AC97,
 879         }
 880 };
 881
 882 /* clocks to add where we need to check their parentage */
 883
 884 /* s3c2443_clk_initparents
 885  *
 886  * Initialise the parents for the clocks that we get at start-time
 887 */
 888
 889 static int __init clk_init_set_parent(struct clk *clk, struct clk *parent)
 890 {
 891         printk(KERN_DEBUG "clock %s: parent %s\n", clk->name, parent->name);
 892         return clk_set_parent(clk, parent);
 893 }
 894
 895 static void __init s3c2443_clk_initparents(void)
 896 {
 897         unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
 898         struct clk *parent;
 899
 900         switch (clksrc & S3C2443_CLKSRC_EPLLREF_MASK) {
 901         case S3C2443_CLKSRC_EPLLREF_EXTCLK:
 902                 parent = &clk_ext;
 903                 break;
 904
 905         case S3C2443_CLKSRC_EPLLREF_XTAL:
 906         default:
 907                 parent = &clk_xtal;
 908                 break;
 909
 910         case S3C2443_CLKSRC_EPLLREF_MPLLREF:
 911         case S3C2443_CLKSRC_EPLLREF_MPLLREF2:
 912                 parent = &clk_mpllref;
 913                 break;
 914         }
 915
 916         clk_init_set_parent(&clk_epllref, parent);
 917
 918         switch (clksrc & S3C2443_CLKSRC_I2S_MASK) {
 919         case S3C2443_CLKSRC_I2S_EXT:
 920                 parent = &clk_i2s_ext;
 921                 break;
 922
 923         case S3C2443_CLKSRC_I2S_EPLLDIV:
 924         default:
 925                 parent = &clk_i2s_eplldiv;
 926                 break;
 927
 928         case S3C2443_CLKSRC_I2S_EPLLREF:
 929         case S3C2443_CLKSRC_I2S_EPLLREF3:
 930                 parent = &clk_epllref;
 931         }
 932
 933         clk_init_set_parent(&clk_i2s, &clk_epllref);
 934
 935         /* esysclk source */
 936
 937         parent = (clksrc & S3C2443_CLKSRC_ESYSCLK_EPLL) ?
 938                 &clk_epll : &clk_epllref;
 939
 940         clk_init_set_parent(&clk_esysclk, parent);
 941
 942         /* msysclk source */
 943
 944         if (clksrc & S3C2443_CLKSRC_MSYSCLK_MPLL) {
 945                 parent = &clk_mpll;
 946         } else {
 947                 parent = (clksrc & S3C2443_CLKSRC_EXTCLK_DIV) ?
 948                         &clk_mdivclk : &clk_mpllref;
 949         }
 950
 951         clk_init_set_parent(&clk_msysclk, parent);
 952
 953         /* arm */
 954
 955         if (__raw_readl(S3C2443_CLKDIV0) & S3C2443_CLKDIV0_DVS)
 956                 parent = &clk_h;
 957         else
 958                 parent = &clk_armdiv;
 959
 960         clk_init_set_parent(&clk_arm, parent);
 961 }
 962
 963 /* armdiv divisor table */
 964
 965 static unsigned int armdiv[16] = {
 966         [S3C2443_CLKDIV0_ARMDIV_1 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]      = 1,
 967         [S3C2443_CLKDIV0_ARMDIV_2 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]      = 2,
 968         [S3C2443_CLKDIV0_ARMDIV_3 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]      = 3,
 969         [S3C2443_CLKDIV0_ARMDIV_4 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]      = 4,
 970         [S3C2443_CLKDIV0_ARMDIV_6 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]      = 6,
 971         [S3C2443_CLKDIV0_ARMDIV_8 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]      = 8,
 972         [S3C2443_CLKDIV0_ARMDIV_12 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]     = 12,
 973         [S3C2443_CLKDIV0_ARMDIV_16 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]     = 16,
 974 };
 975
 976 static inline unsigned int s3c2443_fclk_div(unsigned long clkcon0)
 977 {
 978         clkcon0 &= S3C2443_CLKDIV0_ARMDIV_MASK;
 979
 980         return armdiv[clkcon0 >> S3C2443_CLKDIV0_ARMDIV_SHIFT];
 981 }
 982
 983 static inline unsigned long s3c2443_get_hdiv(unsigned long clkcon0)
 984 {
 985         clkcon0 &= S3C2443_CLKDIV0_HCLKDIV_MASK;
 986
 987         return clkcon0 + 1;
 988 }
 989
 990 /* clocks to add straight away */
 991
 992 static struct clk *clks[] __initdata = {
 993         &clk_ext,
 994         &clk_epll,
 995         &clk_usb_bus_host,
 996         &clk_usb_bus,
 997         &clk_esysclk,
 998         &clk_epllref,
 999         &clk_mpllref,
1000         &clk_msysclk,
1001         &clk_uart,
1002         &clk_display,
1003         &clk_cam,
1004         &clk_i2s_eplldiv,
1005         &clk_i2s,
1006         &clk_hsspi,
1007         &clk_hsmmc_div,
1008         &clk_hsmmc,
1009         &clk_armdiv,
1010         &clk_arm,
1011         &clk_prediv,
1012 };
1013
1014 void __init s3c2443_init_clocks(int xtal)
1015 {
1016         unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
1017         unsigned long mpllcon = __raw_readl(S3C2443_MPLLCON);
1018         unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
1019         unsigned long pll;
1020         unsigned long fclk;
1021         unsigned long hclk;
1022         unsigned long pclk;
1023         struct clk *clkp;
1024         int ret;
1025         int ptr;
1026
1027         /* s3c2443 parents h and p clocks from prediv */
1028         clk_h.parent = &clk_prediv;
1029         clk_p.parent = &clk_prediv;
1030
1031         pll = s3c2443_get_mpll(mpllcon, xtal);
1032         clk_msysclk.rate = pll;
1033
1034         fclk = pll / s3c2443_fclk_div(clkdiv0);
1035         hclk = s3c2443_prediv_getrate(&clk_prediv);
1036         hclk = hclk / s3c2443_get_hdiv(clkdiv0);
1037         hclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_HCLK) ? 2 : 1);
1038         pclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 2 : 1);
1039
1040         s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
1041
1042         printk("S3C2443: mpll %s %ld.%03ld MHz, cpu %ld.%03ld MHz, mem %ld.%03ld MHz, pclk %ld.%03ld MHz\n",
1043                (mpllcon & S3C2443_PLLCON_OFF) ? "off":"on",
1044                print_mhz(pll), print_mhz(fclk),
1045                print_mhz(hclk), print_mhz(pclk));
1046
1047         s3c2443_clk_initparents();
1048
1049         for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
1050                 clkp = clks[ptr];
1051
1052                 ret = s3c24xx_register_clock(clkp);
1053                 if (ret < 0) {
1054                         printk(KERN_ERR "Failed to register clock %s (%d)\n",
1055                                clkp->name, ret);
1056                 }
1057         }
1058
1059         clk_epll.rate = s3c2443_get_epll(epllcon, xtal);
1060
1061         clk_usb_bus.parent = &clk_usb_bus_host;
1062
1063         /* ensure usb bus clock is within correct rate of 48MHz */
1064
1065         if (clk_get_rate(&clk_usb_bus_host) != (48 * 1000 * 1000)) {
1066                 printk(KERN_INFO "Warning: USB host bus not at 48MHz\n");
1067                 clk_set_rate(&clk_usb_bus_host, 48*1000*1000);
1068         }
1069
1070         printk("S3C2443: epll %s %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n",
1071                (epllcon & S3C2443_PLLCON_OFF) ? "off":"on",
1072                print_mhz(clk_get_rate(&clk_epll)),
1073                print_mhz(clk_get_rate(&clk_usb_bus)));
1074
1075         /* register clocks from clock array */
1076
1077         clkp = init_clocks;
1078         for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
1079                 ret = s3c24xx_register_clock(clkp);
1080                 if (ret < 0) {
1081                         printk(KERN_ERR "Failed to register clock %s (%d)\n",
1082                                clkp->name, ret);
1083                 }
1084         }
1085
1086         /* We must be careful disabling the clocks we are not intending to
1087          * be using at boot time, as subsystems such as the LCD which do
1088          * their own DMA requests to the bus can cause the system to lockup
1089          * if they where in the middle of requesting bus access.
1090          *
1091          * Disabling the LCD clock if the LCD is active is very dangerous,
1092          * and therefore the bootloader should be careful to not enable
1093          * the LCD clock if it is not needed.
1094         */
1095
1096         /* install (and disable) the clocks we do not need immediately */
1097
1098         clkp = init_clocks_disable;
1099         for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
1100
1101                 ret = s3c24xx_register_clock(clkp);
1102                 if (ret < 0) {
1103                         printk(KERN_ERR "Failed to register clock %s (%d)\n",
1104                                clkp->name, ret);
1105                 }
1106
1107                 (clkp->enable)(clkp, 0);
1108         }
1109 }