arch/arm/mach-lpc32xx/clock.c

   1 /*
   2  * arch/arm/mach-lpc32xx/clock.c
   3  *
   4  * Author: Kevin Wells <kevin.wells@nxp.com>
   5  *
   6  * Copyright (C) 2010 NXP Semiconductors
   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
  19 /*
  20  * LPC32xx clock management driver overview
  21  *
  22  * The LPC32XX contains a number of high level system clocks that can be
  23  * generated from different sources. These system clocks are used to
  24  * generate the CPU and bus rates and the individual peripheral clocks in
  25  * the system. When Linux is started by the boot loader, the system
  26  * clocks are already running. Stopping a system clock during normal
  27  * Linux operation should never be attempted, as peripherals that require
  28  * those clocks will quit working (ie, DRAM).
  29  *
  30  * The LPC32xx high level clock tree looks as follows. Clocks marked with
  31  * an asterisk are always on and cannot be disabled. Clocks marked with
  32  * an ampersand can only be disabled in CPU suspend mode. Clocks marked
  33  * with a caret are always on if it is the selected clock for the SYSCLK
  34  * source. The clock that isn't used for SYSCLK can be enabled and
  35  * disabled normally.
  36  *                               32KHz oscillator*
  37  *                               /      |      \
  38  *                             RTC*   PLL397^ TOUCH
  39  *                                     /
  40  *               Main oscillator^     /
  41  *                   |        \      /
  42  *                   |         SYSCLK&
  43  *                   |            \
  44  *                   |             \
  45  *                USB_PLL       HCLK_PLL&
  46  *                   |           |    |
  47  *            USB host/device  PCLK&  |
  48  *                               |    |
  49  *                             Peripherals
  50  *
  51  * The CPU and chip bus rates are derived from the HCLK PLL, which can
  52  * generate various clock rates up to 266MHz and beyond. The internal bus
  53  * rates (PCLK and HCLK) are generated from dividers based on the HCLK
  54  * PLL rate. HCLK can be a ratio of 1:1, 1:2, or 1:4 or HCLK PLL rate,
  55  * while PCLK can be 1:1 to 1:32 of HCLK PLL rate. Most peripherals high
  56  * level clocks are based on either HCLK or PCLK, but have their own
  57  * dividers as part of the IP itself. Because of this, the system clock
  58  * rates should not be changed.
  59  *
  60  * The HCLK PLL is clocked from SYSCLK, which can be derived from the
  61  * main oscillator or PLL397. PLL397 generates a rate that is 397 times
  62  * the 32KHz oscillator rate. The main oscillator runs at the selected
  63  * oscillator/crystal rate on the mosc_in pin of the LPC32xx. This rate
  64  * is normally 13MHz, but depends on the selection of external crystals
  65  * or oscillators. If USB operation is required, the main oscillator must
  66  * be used in the system.
  67  *
  68  * Switching SYSCLK between sources during normal Linux operation is not
  69  * supported. SYSCLK is preset in the bootloader. Because of the
  70  * complexities of clock management during clock frequency changes,
  71  * there are some limitations to the clock driver explained below:
  72  * - The PLL397 and main oscillator can be enabled and disabled by the
  73  *   clk_enable() and clk_disable() functions unless SYSCLK is based
  74  *   on that clock. This allows the other oscillator that isn't driving
  75  *   the HCLK PLL to be used as another system clock that can be routed
  76  *   to an external pin.
  77  * - The muxed SYSCLK input and HCLK_PLL rate cannot be changed with
  78  *   this driver.
  79  * - HCLK and PCLK rates cannot be changed as part of this driver.
  80  * - Most peripherals have their own dividers are part of the peripheral
  81  *   block. Changing SYSCLK, HCLK PLL, HCLK, or PCLK sources or rates
  82  *   will also impact the individual peripheral rates.
  83  */
  84
  85 #include <linux/export.h>
  86 #include <linux/kernel.h>
  87 #include <linux/list.h>
  88 #include <linux/errno.h>
  89 #include <linux/device.h>
  90 #include <linux/delay.h>
  91 #include <linux/err.h>
  92 #include <linux/clk.h>
  93 #include <linux/amba/bus.h>
  94 #include <linux/amba/clcd.h>
  95 #include <linux/clkdev.h>
  96
  97 #include <mach/hardware.h>
  98 #include <mach/platform.h>
  99 #include "clock.h"
 100 #include "common.h"
 101
 102 static DEFINE_SPINLOCK(global_clkregs_lock);
 103
 104 static int usb_pll_enable, usb_pll_valid;
 105
 106 static struct clk clk_armpll;
 107 static struct clk clk_usbpll;
 108
 109 /*
 110  * Post divider values for PLLs based on selected register value
 111  */
 112 static const u32 pll_postdivs[4] = {1, 2, 4, 8};
 113
 114 static unsigned long local_return_parent_rate(struct clk *clk)
 115 {
 116         /*
 117          * If a clock has a rate of 0, then it inherits it's parent
 118          * clock rate
 119          */
 120         while (clk->rate == 0)
 121                 clk = clk->parent;
 122
 123         return clk->rate;
 124 }
 125
 126 /* 32KHz clock has a fixed rate and is not stoppable */
 127 static struct clk osc_32KHz = {
 128         .rate           = LPC32XX_CLOCK_OSC_FREQ,
 129         .get_rate       = local_return_parent_rate,
 130 };
 131
 132 static int local_pll397_enable(struct clk *clk, int enable)
 133 {
 134         u32 reg;
 135         unsigned long timeout = jiffies + msecs_to_jiffies(10);
 136
 137         reg = __raw_readl(LPC32XX_CLKPWR_PLL397_CTRL);
 138
 139         if (enable == 0) {
 140                 reg |= LPC32XX_CLKPWR_SYSCTRL_PLL397_DIS;
 141                 __raw_writel(reg, LPC32XX_CLKPWR_PLL397_CTRL);
 142         } else {
 143                 /* Enable PLL397 */
 144                 reg &= ~LPC32XX_CLKPWR_SYSCTRL_PLL397_DIS;
 145                 __raw_writel(reg, LPC32XX_CLKPWR_PLL397_CTRL);
 146
 147                 /* Wait for PLL397 lock */
 148                 while (((__raw_readl(LPC32XX_CLKPWR_PLL397_CTRL) &
 149                         LPC32XX_CLKPWR_SYSCTRL_PLL397_STS) == 0) &&
 150                         time_before(jiffies, timeout))
 151                         cpu_relax();
 152
 153                 if ((__raw_readl(LPC32XX_CLKPWR_PLL397_CTRL) &
 154                         LPC32XX_CLKPWR_SYSCTRL_PLL397_STS) == 0)
 155                         return -ENODEV;
 156         }
 157
 158         return 0;
 159 }
 160
 161 static int local_oscmain_enable(struct clk *clk, int enable)
 162 {
 163         u32 reg;
 164         unsigned long timeout = jiffies + msecs_to_jiffies(10);
 165
 166         reg = __raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL);
 167
 168         if (enable == 0) {
 169                 reg |= LPC32XX_CLKPWR_MOSC_DISABLE;
 170                 __raw_writel(reg, LPC32XX_CLKPWR_MAIN_OSC_CTRL);
 171         } else {
 172                 /* Enable main oscillator */
 173                 reg &= ~LPC32XX_CLKPWR_MOSC_DISABLE;
 174                 __raw_writel(reg, LPC32XX_CLKPWR_MAIN_OSC_CTRL);
 175
 176                 /* Wait for main oscillator to start */
 177                 while (((__raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL) &
 178                         LPC32XX_CLKPWR_MOSC_DISABLE) != 0) &&
 179                         time_before(jiffies, timeout))
 180                         cpu_relax();
 181
 182                 if ((__raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL) &
 183                         LPC32XX_CLKPWR_MOSC_DISABLE) != 0)
 184                         return -ENODEV;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static struct clk osc_pll397 = {
 191         .parent         = &osc_32KHz,
 192         .enable         = local_pll397_enable,
 193         .rate           = LPC32XX_CLOCK_OSC_FREQ * 397,
 194         .get_rate       = local_return_parent_rate,
 195 };
 196
 197 static struct clk osc_main = {
 198         .enable         = local_oscmain_enable,
 199         .rate           = LPC32XX_MAIN_OSC_FREQ,
 200         .get_rate       = local_return_parent_rate,
 201 };
 202
 203 static struct clk clk_sys;
 204
 205 /*
 206  * Convert a PLL register value to a PLL output frequency
 207  */
 208 u32 clk_get_pllrate_from_reg(u32 inputclk, u32 regval)
 209 {
 210         struct clk_pll_setup pllcfg;
 211
 212         pllcfg.cco_bypass_b15 = 0;
 213         pllcfg.direct_output_b14 = 0;
 214         pllcfg.fdbk_div_ctrl_b13 = 0;
 215         if ((regval & LPC32XX_CLKPWR_HCLKPLL_CCO_BYPASS) != 0)
 216                 pllcfg.cco_bypass_b15 = 1;
 217         if ((regval & LPC32XX_CLKPWR_HCLKPLL_POSTDIV_BYPASS) != 0)
 218                 pllcfg.direct_output_b14 = 1;
 219         if ((regval & LPC32XX_CLKPWR_HCLKPLL_FDBK_SEL_FCLK) != 0)
 220                 pllcfg.fdbk_div_ctrl_b13 = 1;
 221         pllcfg.pll_m = 1 + ((regval >> 1) & 0xFF);
 222         pllcfg.pll_n = 1 + ((regval >> 9) & 0x3);
 223         pllcfg.pll_p = pll_postdivs[((regval >> 11) & 0x3)];
 224
 225         return clk_check_pll_setup(inputclk, &pllcfg);
 226 }
 227
 228 /*
 229  * Setup the HCLK PLL with a PLL structure
 230  */
 231 static u32 local_clk_pll_setup(struct clk_pll_setup *PllSetup)
 232 {
 233         u32 tv, tmp = 0;
 234
 235         if (PllSetup->analog_on != 0)
 236                 tmp |= LPC32XX_CLKPWR_HCLKPLL_POWER_UP;
 237         if (PllSetup->cco_bypass_b15 != 0)
 238                 tmp |= LPC32XX_CLKPWR_HCLKPLL_CCO_BYPASS;
 239         if (PllSetup->direct_output_b14 != 0)
 240                 tmp |= LPC32XX_CLKPWR_HCLKPLL_POSTDIV_BYPASS;
 241         if (PllSetup->fdbk_div_ctrl_b13 != 0)
 242                 tmp |= LPC32XX_CLKPWR_HCLKPLL_FDBK_SEL_FCLK;
 243
 244         tv = ffs(PllSetup->pll_p) - 1;
 245         if ((!is_power_of_2(PllSetup->pll_p)) || (tv > 3))
 246                 return 0;
 247
 248         tmp |= LPC32XX_CLKPWR_HCLKPLL_POSTDIV_2POW(tv);
 249         tmp |= LPC32XX_CLKPWR_HCLKPLL_PREDIV_PLUS1(PllSetup->pll_n - 1);
 250         tmp |= LPC32XX_CLKPWR_HCLKPLL_PLLM(PllSetup->pll_m - 1);
 251
 252         return tmp;
 253 }
 254
 255 /*
 256  * Update the ARM core PLL frequency rate variable from the actual PLL setting
 257  */
 258 static void local_update_armpll_rate(void)
 259 {
 260         u32 clkin, pllreg;
 261
 262         clkin = clk_armpll.parent->rate;
 263         pllreg = __raw_readl(LPC32XX_CLKPWR_HCLKPLL_CTRL) & 0x1FFFF;
 264
 265         clk_armpll.rate = clk_get_pllrate_from_reg(clkin, pllreg);
 266 }
 267
 268 /*
 269  * Find a PLL configuration for the selected input frequency
 270  */
 271 static u32 local_clk_find_pll_cfg(u32 pllin_freq, u32 target_freq,
 272         struct clk_pll_setup *pllsetup)
 273 {
 274         u32 ifreq, freqtol, m, n, p, fclkout;
 275
 276         /* Determine frequency tolerance limits */
 277         freqtol = target_freq / 250;
 278         ifreq = pllin_freq;
 279
 280         /* Is direct bypass mode possible? */
 281         if (abs(pllin_freq - target_freq) <= freqtol) {
 282                 pllsetup->analog_on = 0;
 283                 pllsetup->cco_bypass_b15 = 1;
 284                 pllsetup->direct_output_b14 = 1;
 285                 pllsetup->fdbk_div_ctrl_b13 = 1;
 286                 pllsetup->pll_p = pll_postdivs[0];
 287                 pllsetup->pll_n = 1;
 288                 pllsetup->pll_m = 1;
 289                 return clk_check_pll_setup(ifreq, pllsetup);
 290         } else if (target_freq <= ifreq) {
 291                 pllsetup->analog_on = 0;
 292                 pllsetup->cco_bypass_b15 = 1;
 293                 pllsetup->direct_output_b14 = 0;
 294                 pllsetup->fdbk_div_ctrl_b13 = 1;
 295                 pllsetup->pll_n = 1;
 296                 pllsetup->pll_m = 1;
 297                 for (p = 0; p <= 3; p++) {
 298                         pllsetup->pll_p = pll_postdivs[p];
 299                         fclkout = clk_check_pll_setup(ifreq, pllsetup);
 300                         if (abs(target_freq - fclkout) <= freqtol)
 301                                 return fclkout;
 302                 }
 303         }
 304
 305         /* Is direct mode possible? */
 306         pllsetup->analog_on = 1;
 307         pllsetup->cco_bypass_b15 = 0;
 308         pllsetup->direct_output_b14 = 1;
 309         pllsetup->fdbk_div_ctrl_b13 = 0;
 310         pllsetup->pll_p = pll_postdivs[0];
 311         for (m = 1; m <= 256; m++) {
 312                 for (n = 1; n <= 4; n++) {
 313                         /* Compute output frequency for this value */
 314                         pllsetup->pll_n = n;
 315                         pllsetup->pll_m = m;
 316                         fclkout = clk_check_pll_setup(ifreq,
 317                                 pllsetup);
 318                         if (abs(target_freq - fclkout) <=
 319                                 freqtol)
 320                                 return fclkout;
 321                 }
 322         }
 323
 324         /* Is integer mode possible? */
 325         pllsetup->analog_on = 1;
 326         pllsetup->cco_bypass_b15 = 0;
 327         pllsetup->direct_output_b14 = 0;
 328         pllsetup->fdbk_div_ctrl_b13 = 1;
 329         for (m = 1; m <= 256; m++) {
 330                 for (n = 1; n <= 4; n++) {
 331                         for (p = 0; p < 4; p++) {
 332                                 /* Compute output frequency */
 333                                 pllsetup->pll_p = pll_postdivs[p];
 334                                 pllsetup->pll_n = n;
 335                                 pllsetup->pll_m = m;
 336                                 fclkout = clk_check_pll_setup(
 337                                         ifreq, pllsetup);
 338                                 if (abs(target_freq - fclkout) <= freqtol)
 339                                         return fclkout;
 340                         }
 341                 }
 342         }
 343
 344         /* Try non-integer mode */
 345         pllsetup->analog_on = 1;
 346         pllsetup->cco_bypass_b15 = 0;
 347         pllsetup->direct_output_b14 = 0;
 348         pllsetup->fdbk_div_ctrl_b13 = 0;
 349         for (m = 1; m <= 256; m++) {
 350                 for (n = 1; n <= 4; n++) {
 351                         for (p = 0; p < 4; p++) {
 352                                 /* Compute output frequency */
 353                                 pllsetup->pll_p = pll_postdivs[p];
 354                                 pllsetup->pll_n = n;
 355                                 pllsetup->pll_m = m;
 356                                 fclkout = clk_check_pll_setup(
 357                                         ifreq, pllsetup);
 358                                 if (abs(target_freq - fclkout) <= freqtol)
 359                                         return fclkout;
 360                         }
 361                 }
 362         }
 363
 364         return 0;
 365 }
 366
 367 static struct clk clk_armpll = {
 368         .parent         = &clk_sys,
 369         .get_rate       = local_return_parent_rate,
 370 };
 371
 372 /*
 373  * Setup the USB PLL with a PLL structure
 374  */
 375 static u32 local_clk_usbpll_setup(struct clk_pll_setup *pHCLKPllSetup)
 376 {
 377         u32 reg, tmp = local_clk_pll_setup(pHCLKPllSetup);
 378
 379         reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL) & ~0x1FFFF;
 380         reg |= tmp;
 381         __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
 382
 383         return clk_check_pll_setup(clk_usbpll.parent->rate,
 384                 pHCLKPllSetup);
 385 }
 386
 387 static int local_usbpll_enable(struct clk *clk, int enable)
 388 {
 389         u32 reg;
 390         int ret = 0;
 391         unsigned long timeout = jiffies + msecs_to_jiffies(20);
 392
 393         reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
 394
 395         __raw_writel(reg & ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN2 |
 396                 LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP),
 397                 LPC32XX_CLKPWR_USB_CTRL);
 398         __raw_writel(reg & ~LPC32XX_CLKPWR_USBCTRL_CLK_EN1,
 399                 LPC32XX_CLKPWR_USB_CTRL);
 400
 401         if (enable && usb_pll_valid && usb_pll_enable) {
 402                 ret = -ENODEV;
 403                 /*
 404                  * If the PLL rate has been previously set, then the rate
 405                  * in the PLL register is valid and can be enabled here.
 406                  * Otherwise, it needs to be enabled as part of setrate.
 407                  */
 408
 409                 /*
 410                  * Gate clock into PLL
 411                  */
 412                 reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN1;
 413                 __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
 414
 415                 /*
 416                  * Enable PLL
 417                  */
 418                 reg |= LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP;
 419                 __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
 420
 421                 /*
 422                  * Wait for PLL to lock
 423                  */
 424                 while (time_before(jiffies, timeout) && (ret == -ENODEV)) {
 425                         reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
 426                         if (reg & LPC32XX_CLKPWR_USBCTRL_PLL_STS)
 427                                 ret = 0;
 428                         else
 429                                 udelay(10);
 430                 }
 431
 432                 /*
 433                  * Gate clock from PLL if PLL is locked
 434                  */
 435                 if (ret == 0) {
 436                         __raw_writel(reg | LPC32XX_CLKPWR_USBCTRL_CLK_EN2,
 437                                 LPC32XX_CLKPWR_USB_CTRL);
 438                 } else {
 439                         __raw_writel(reg & ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN1 |
 440                                 LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP),
 441                                 LPC32XX_CLKPWR_USB_CTRL);
 442                 }
 443         } else if ((enable == 0) && usb_pll_valid  && usb_pll_enable) {
 444                 usb_pll_valid = 0;
 445                 usb_pll_enable = 0;
 446         }
 447
 448         return ret;
 449 }
 450
 451 static unsigned long local_usbpll_round_rate(struct clk *clk,
 452         unsigned long rate)
 453 {
 454         u32 clkin, usbdiv;
 455         struct clk_pll_setup pllsetup;
 456
 457         /*
 458          * Unlike other clocks, this clock has a KHz input rate, so bump
 459          * it up to work with the PLL function
 460          */
 461         rate = rate * 1000;
 462
 463         clkin = clk->get_rate(clk);
 464         usbdiv = (__raw_readl(LPC32XX_CLKPWR_USBCLK_PDIV) &
 465                 LPC32XX_CLKPWR_USBPDIV_PLL_MASK) + 1;
 466         clkin = clkin / usbdiv;
 467
 468         /* Try to find a good rate setup */
 469         if (local_clk_find_pll_cfg(clkin, rate, &pllsetup) == 0)
 470                 return 0;
 471
 472         return clk_check_pll_setup(clkin, &pllsetup);
 473 }
 474
 475 static int local_usbpll_set_rate(struct clk *clk, unsigned long rate)
 476 {
 477         int ret = -ENODEV;
 478         u32 clkin, usbdiv;
 479         struct clk_pll_setup pllsetup;
 480
 481         /*
 482          * Unlike other clocks, this clock has a KHz input rate, so bump
 483          * it up to work with the PLL function
 484          */
 485         rate = rate * 1000;
 486
 487         clkin = clk->get_rate(clk->parent);
 488         usbdiv = (__raw_readl(LPC32XX_CLKPWR_USBCLK_PDIV) &
 489                 LPC32XX_CLKPWR_USBPDIV_PLL_MASK) + 1;
 490         clkin = clkin / usbdiv;
 491
 492         /* Try to find a good rate setup */
 493         if (local_clk_find_pll_cfg(clkin, rate, &pllsetup) == 0)
 494                 return -EINVAL;
 495
 496         /*
 497          * Disable PLL clocks during PLL change
 498          */
 499         local_usbpll_enable(clk, 0);
 500         pllsetup.analog_on = 0;
 501         local_clk_usbpll_setup(&pllsetup);
 502
 503         /*
 504          * Start USB PLL and check PLL status
 505          */
 506
 507         usb_pll_valid = 1;
 508         usb_pll_enable = 1;
 509
 510         ret = local_usbpll_enable(clk, 1);
 511         if (ret >= 0)
 512                 clk->rate = clk_check_pll_setup(clkin, &pllsetup);
 513
 514         return ret;
 515 }
 516
 517 static struct clk clk_usbpll = {
 518         .parent         = &osc_main,
 519         .set_rate       = local_usbpll_set_rate,
 520         .enable         = local_usbpll_enable,
 521         .rate           = 48000, /* In KHz */
 522         .get_rate       = local_return_parent_rate,
 523         .round_rate     = local_usbpll_round_rate,
 524 };
 525
 526 static u32 clk_get_hclk_div(void)
 527 {
 528         static const u32 hclkdivs[4] = {1, 2, 4, 4};
 529         return hclkdivs[LPC32XX_CLKPWR_HCLKDIV_DIV_2POW(
 530                 __raw_readl(LPC32XX_CLKPWR_HCLK_DIV))];
 531 }
 532
 533 static struct clk clk_hclk = {
 534         .parent         = &clk_armpll,
 535         .get_rate       = local_return_parent_rate,
 536 };
 537
 538 static struct clk clk_pclk = {
 539         .parent         = &clk_armpll,
 540         .get_rate       = local_return_parent_rate,
 541 };
 542
 543 static int local_onoff_enable(struct clk *clk, int enable)
 544 {
 545         u32 tmp;
 546
 547         tmp = __raw_readl(clk->enable_reg);
 548
 549         if (enable == 0)
 550                 tmp &= ~clk->enable_mask;
 551         else
 552                 tmp |= clk->enable_mask;
 553
 554         __raw_writel(tmp, clk->enable_reg);
 555
 556         return 0;
 557 }
 558
 559 /* Peripheral clock sources */
 560 static struct clk clk_timer0 = {
 561         .parent         = &clk_pclk,
 562         .enable         = local_onoff_enable,
 563         .enable_reg     = LPC32XX_CLKPWR_TIMERS_PWMS_CLK_CTRL_1,
 564         .enable_mask    = LPC32XX_CLKPWR_TMRPWMCLK_TIMER0_EN,
 565         .get_rate       = local_return_parent_rate,
 566 };
 567 static struct clk clk_timer1 = {
 568         .parent         = &clk_pclk,
 569         .enable         = local_onoff_enable,
 570         .enable_reg     = LPC32XX_CLKPWR_TIMERS_PWMS_CLK_CTRL_1,
 571         .enable_mask    = LPC32XX_CLKPWR_TMRPWMCLK_TIMER1_EN,
 572         .get_rate       = local_return_parent_rate,
 573 };
 574 static struct clk clk_timer2 = {
 575         .parent         = &clk_pclk,
 576         .enable         = local_onoff_enable,
 577         .enable_reg     = LPC32XX_CLKPWR_TIMERS_PWMS_CLK_CTRL_1,
 578         .enable_mask    = LPC32XX_CLKPWR_TMRPWMCLK_TIMER2_EN,
 579         .get_rate       = local_return_parent_rate,
 580 };
 581 static struct clk clk_timer3 = {
 582         .parent         = &clk_pclk,
 583         .enable         = local_onoff_enable,
 584         .enable_reg     = LPC32XX_CLKPWR_TIMERS_PWMS_CLK_CTRL_1,
 585         .enable_mask    = LPC32XX_CLKPWR_TMRPWMCLK_TIMER3_EN,
 586         .get_rate       = local_return_parent_rate,
 587 };
 588 static struct clk clk_wdt = {
 589         .parent         = &clk_pclk,
 590         .enable         = local_onoff_enable,
 591         .enable_reg     = LPC32XX_CLKPWR_TIMER_CLK_CTRL,
 592         .enable_mask    = LPC32XX_CLKPWR_PWMCLK_WDOG_EN,
 593         .get_rate       = local_return_parent_rate,
 594 };
 595 static struct clk clk_vfp9 = {
 596         .parent         = &clk_pclk,
 597         .enable         = local_onoff_enable,
 598         .enable_reg     = LPC32XX_CLKPWR_DEBUG_CTRL,
 599         .enable_mask    = LPC32XX_CLKPWR_VFP_CLOCK_ENABLE_BIT,
 600         .get_rate       = local_return_parent_rate,
 601 };
 602 static struct clk clk_dma = {
 603         .parent         = &clk_hclk,
 604         .enable         = local_onoff_enable,
 605         .enable_reg     = LPC32XX_CLKPWR_DMA_CLK_CTRL,
 606         .enable_mask    = LPC32XX_CLKPWR_DMACLKCTRL_CLK_EN,
 607         .get_rate       = local_return_parent_rate,
 608 };
 609
 610 static struct clk clk_pwm = {
 611         .parent         = &clk_pclk,
 612         .enable         = local_onoff_enable,
 613         .enable_reg     = LPC32XX_CLKPWR_PWM_CLK_CTRL,
 614         .enable_mask    = LPC32XX_CLKPWR_PWMCLK_PWM1CLK_EN |
 615                           LPC32XX_CLKPWR_PWMCLK_PWM1SEL_PCLK |
 616                           LPC32XX_CLKPWR_PWMCLK_PWM1_DIV(1) |
 617                           LPC32XX_CLKPWR_PWMCLK_PWM2CLK_EN |
 618                           LPC32XX_CLKPWR_PWMCLK_PWM2SEL_PCLK |
 619                           LPC32XX_CLKPWR_PWMCLK_PWM2_DIV(1),
 620         .get_rate       = local_return_parent_rate,
 621 };
 622
 623 static struct clk clk_uart3 = {
 624         .parent         = &clk_pclk,
 625         .enable         = local_onoff_enable,
 626         .enable_reg     = LPC32XX_CLKPWR_UART_CLK_CTRL,
 627         .enable_mask    = LPC32XX_CLKPWR_UARTCLKCTRL_UART3_EN,
 628         .get_rate       = local_return_parent_rate,
 629 };
 630
 631 static struct clk clk_uart4 = {
 632         .parent         = &clk_pclk,
 633         .enable         = local_onoff_enable,
 634         .enable_reg     = LPC32XX_CLKPWR_UART_CLK_CTRL,
 635         .enable_mask    = LPC32XX_CLKPWR_UARTCLKCTRL_UART4_EN,
 636         .get_rate       = local_return_parent_rate,
 637 };
 638
 639 static struct clk clk_uart5 = {
 640         .parent         = &clk_pclk,
 641         .enable         = local_onoff_enable,
 642         .enable_reg     = LPC32XX_CLKPWR_UART_CLK_CTRL,
 643         .enable_mask    = LPC32XX_CLKPWR_UARTCLKCTRL_UART5_EN,
 644         .get_rate       = local_return_parent_rate,
 645 };
 646
 647 static struct clk clk_uart6 = {
 648         .parent         = &clk_pclk,
 649         .enable         = local_onoff_enable,
 650         .enable_reg     = LPC32XX_CLKPWR_UART_CLK_CTRL,
 651         .enable_mask    = LPC32XX_CLKPWR_UARTCLKCTRL_UART6_EN,
 652         .get_rate       = local_return_parent_rate,
 653 };
 654
 655 static struct clk clk_i2c0 = {
 656         .parent         = &clk_hclk,
 657         .enable         = local_onoff_enable,
 658         .enable_reg     = LPC32XX_CLKPWR_I2C_CLK_CTRL,
 659         .enable_mask    = LPC32XX_CLKPWR_I2CCLK_I2C1CLK_EN,
 660         .get_rate       = local_return_parent_rate,
 661 };
 662
 663 static struct clk clk_i2c1 = {
 664         .parent         = &clk_hclk,
 665         .enable         = local_onoff_enable,
 666         .enable_reg     = LPC32XX_CLKPWR_I2C_CLK_CTRL,
 667         .enable_mask    = LPC32XX_CLKPWR_I2CCLK_I2C2CLK_EN,
 668         .get_rate       = local_return_parent_rate,
 669 };
 670
 671 static struct clk clk_i2c2 = {
 672         .parent         = &clk_pclk,
 673         .enable         = local_onoff_enable,
 674         .enable_reg     = io_p2v(LPC32XX_USB_BASE + 0xFF4),
 675         .enable_mask    = 0x4,
 676         .get_rate       = local_return_parent_rate,
 677 };
 678
 679 static struct clk clk_ssp0 = {
 680         .parent         = &clk_hclk,
 681         .enable         = local_onoff_enable,
 682         .enable_reg     = LPC32XX_CLKPWR_SSP_CLK_CTRL,
 683         .enable_mask    = LPC32XX_CLKPWR_SSPCTRL_SSPCLK0_EN,
 684         .get_rate       = local_return_parent_rate,
 685 };
 686
 687 static struct clk clk_ssp1 = {
 688         .parent         = &clk_hclk,
 689         .enable         = local_onoff_enable,
 690         .enable_reg     = LPC32XX_CLKPWR_SSP_CLK_CTRL,
 691         .enable_mask    = LPC32XX_CLKPWR_SSPCTRL_SSPCLK1_EN,
 692         .get_rate       = local_return_parent_rate,
 693 };
 694
 695 static struct clk clk_kscan = {
 696         .parent         = &osc_32KHz,
 697         .enable         = local_onoff_enable,
 698         .enable_reg     = LPC32XX_CLKPWR_KEY_CLK_CTRL,
 699         .enable_mask    = LPC32XX_CLKPWR_KEYCLKCTRL_CLK_EN,
 700         .get_rate       = local_return_parent_rate,
 701 };
 702
 703 static struct clk clk_nand = {
 704         .parent         = &clk_hclk,
 705         .enable         = local_onoff_enable,
 706         .enable_reg     = LPC32XX_CLKPWR_NAND_CLK_CTRL,
 707         .enable_mask    = LPC32XX_CLKPWR_NANDCLK_SLCCLK_EN |
 708                           LPC32XX_CLKPWR_NANDCLK_SEL_SLC,
 709         .get_rate       = local_return_parent_rate,
 710 };
 711
 712 static struct clk clk_nand_mlc = {
 713         .parent         = &clk_hclk,
 714         .enable         = local_onoff_enable,
 715         .enable_reg     = LPC32XX_CLKPWR_NAND_CLK_CTRL,
 716         .enable_mask    = LPC32XX_CLKPWR_NANDCLK_MLCCLK_EN |
 717                           LPC32XX_CLKPWR_NANDCLK_DMA_INT |
 718                           LPC32XX_CLKPWR_NANDCLK_INTSEL_MLC,
 719         .get_rate       = local_return_parent_rate,
 720 };
 721
 722 static struct clk clk_i2s0 = {
 723         .parent         = &clk_hclk,
 724         .enable         = local_onoff_enable,
 725         .enable_reg     = LPC32XX_CLKPWR_I2S_CLK_CTRL,
 726         .enable_mask    = LPC32XX_CLKPWR_I2SCTRL_I2SCLK0_EN,
 727         .get_rate       = local_return_parent_rate,
 728 };
 729
 730 static struct clk clk_i2s1 = {
 731         .parent         = &clk_hclk,
 732         .enable         = local_onoff_enable,
 733         .enable_reg     = LPC32XX_CLKPWR_I2S_CLK_CTRL,
 734         .enable_mask    = LPC32XX_CLKPWR_I2SCTRL_I2SCLK1_EN |
 735                           LPC32XX_CLKPWR_I2SCTRL_I2S1_USE_DMA,
 736         .get_rate       = local_return_parent_rate,
 737 };
 738
 739 static struct clk clk_net = {
 740         .parent         = &clk_hclk,
 741         .enable         = local_onoff_enable,
 742         .enable_reg     = LPC32XX_CLKPWR_MACCLK_CTRL,
 743         .enable_mask    = (LPC32XX_CLKPWR_MACCTRL_DMACLK_EN |
 744                 LPC32XX_CLKPWR_MACCTRL_MMIOCLK_EN |
 745                 LPC32XX_CLKPWR_MACCTRL_HRCCLK_EN),
 746         .get_rate       = local_return_parent_rate,
 747 };
 748
 749 static struct clk clk_rtc = {
 750         .parent         = &osc_32KHz,
 751         .rate           = 1, /* 1 Hz */
 752         .get_rate       = local_return_parent_rate,
 753 };
 754
 755 static int local_usb_enable(struct clk *clk, int enable)
 756 {
 757         u32 tmp;
 758
 759         if (enable) {
 760                 /* Set up I2C pull levels */
 761                 tmp = __raw_readl(LPC32XX_CLKPWR_I2C_CLK_CTRL);
 762                 tmp |= LPC32XX_CLKPWR_I2CCLK_USBI2CHI_DRIVE;
 763                 __raw_writel(tmp, LPC32XX_CLKPWR_I2C_CLK_CTRL);
 764         }
 765
 766         return local_onoff_enable(clk, enable);
 767 }
 768
 769 static struct clk clk_usbd = {
 770         .parent         = &clk_usbpll,
 771         .enable         = local_usb_enable,
 772         .enable_reg     = LPC32XX_CLKPWR_USB_CTRL,
 773         .enable_mask    = LPC32XX_CLKPWR_USBCTRL_HCLK_EN,
 774         .get_rate       = local_return_parent_rate,
 775 };
 776
 777 #define OTG_ALWAYS_MASK         (LPC32XX_USB_OTG_OTG_CLOCK_ON | \
 778                                  LPC32XX_USB_OTG_I2C_CLOCK_ON)
 779
 780 static int local_usb_otg_enable(struct clk *clk, int enable)
 781 {
 782         int to = 1000;
 783
 784         if (enable) {
 785                 __raw_writel(clk->enable_mask, clk->enable_reg);
 786
 787                 while (((__raw_readl(LPC32XX_USB_OTG_CLK_STAT) &
 788                         clk->enable_mask) != clk->enable_mask) && (to > 0))
 789                         to--;
 790         } else {
 791                 __raw_writel(OTG_ALWAYS_MASK, clk->enable_reg);
 792
 793                 while (((__raw_readl(LPC32XX_USB_OTG_CLK_STAT) &
 794                         OTG_ALWAYS_MASK) != OTG_ALWAYS_MASK) && (to > 0))
 795                         to--;
 796         }
 797
 798         if (to)
 799                 return 0;
 800         else
 801                 return -1;
 802 }
 803
 804 static struct clk clk_usb_otg_dev = {
 805         .parent         = &clk_usbpll,
 806         .enable         = local_usb_otg_enable,
 807         .enable_reg     = LPC32XX_USB_OTG_CLK_CTRL,
 808         .enable_mask    = LPC32XX_USB_OTG_AHB_M_CLOCK_ON |
 809                           LPC32XX_USB_OTG_OTG_CLOCK_ON |
 810                           LPC32XX_USB_OTG_DEV_CLOCK_ON |
 811                           LPC32XX_USB_OTG_I2C_CLOCK_ON,
 812         .get_rate       = local_return_parent_rate,
 813 };
 814
 815 static struct clk clk_usb_otg_host = {
 816         .parent         = &clk_usbpll,
 817         .enable         = local_usb_otg_enable,
 818         .enable_reg     = LPC32XX_USB_OTG_CLK_CTRL,
 819         .enable_mask    = LPC32XX_USB_OTG_AHB_M_CLOCK_ON |
 820                           LPC32XX_USB_OTG_OTG_CLOCK_ON |
 821                           LPC32XX_USB_OTG_HOST_CLOCK_ON |
 822                           LPC32XX_USB_OTG_I2C_CLOCK_ON,
 823         .get_rate       = local_return_parent_rate,
 824 };
 825
 826 static int tsc_onoff_enable(struct clk *clk, int enable)
 827 {
 828         u32 tmp;
 829
 830         /* Make sure 32KHz clock is the selected clock */
 831         tmp = __raw_readl(LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
 832         tmp &= ~LPC32XX_CLKPWR_ADCCTRL1_PCLK_SEL;
 833         __raw_writel(tmp, LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
 834
 835         if (enable == 0)
 836                 __raw_writel(0, clk->enable_reg);
 837         else
 838                 __raw_writel(clk->enable_mask, clk->enable_reg);
 839
 840         return 0;
 841 }
 842
 843 static struct clk clk_tsc = {
 844         .parent         = &osc_32KHz,
 845         .enable         = tsc_onoff_enable,
 846         .enable_reg     = LPC32XX_CLKPWR_ADC_CLK_CTRL,
 847         .enable_mask    = LPC32XX_CLKPWR_ADC32CLKCTRL_CLK_EN,
 848         .get_rate       = local_return_parent_rate,
 849 };
 850
 851 static int adc_onoff_enable(struct clk *clk, int enable)
 852 {
 853         u32 tmp;
 854         u32 divider;
 855
 856         /* Use PERIPH_CLOCK */
 857         tmp = __raw_readl(LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
 858         tmp |= LPC32XX_CLKPWR_ADCCTRL1_PCLK_SEL;
 859         /*
 860          * Set clock divider so that we have equal to or less than
 861          * 4.5MHz clock at ADC
 862          */
 863         divider = clk->get_rate(clk) / 4500000 + 1;
 864         tmp |= divider;
 865         __raw_writel(tmp, LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
 866
 867         /* synchronize rate of this clock w/ actual HW setting */
 868         clk->rate = clk->get_rate(clk->parent) / divider;
 869
 870         if (enable == 0)
 871                 __raw_writel(0, clk->enable_reg);
 872         else
 873                 __raw_writel(clk->enable_mask, clk->enable_reg);
 874
 875         return 0;
 876 }
 877
 878 static struct clk clk_adc = {
 879         .parent         = &clk_pclk,
 880         .enable         = adc_onoff_enable,
 881         .enable_reg     = LPC32XX_CLKPWR_ADC_CLK_CTRL,
 882         .enable_mask    = LPC32XX_CLKPWR_ADC32CLKCTRL_CLK_EN,
 883         .get_rate       = local_return_parent_rate,
 884 };
 885
 886 static int mmc_onoff_enable(struct clk *clk, int enable)
 887 {
 888         u32 tmp;
 889
 890         tmp = __raw_readl(LPC32XX_CLKPWR_MS_CTRL) &
 891                 ~(LPC32XX_CLKPWR_MSCARD_SDCARD_EN |
 892                   LPC32XX_CLKPWR_MSCARD_MSDIO_PU_EN |
 893                   LPC32XX_CLKPWR_MSCARD_MSDIO_PIN_DIS |
 894                   LPC32XX_CLKPWR_MSCARD_MSDIO0_DIS |
 895                   LPC32XX_CLKPWR_MSCARD_MSDIO1_DIS |
 896                   LPC32XX_CLKPWR_MSCARD_MSDIO23_DIS);
 897
 898         /* If rate is 0, disable clock */
 899         if (enable != 0)
 900                 tmp |= LPC32XX_CLKPWR_MSCARD_SDCARD_EN |
 901                         LPC32XX_CLKPWR_MSCARD_MSDIO_PU_EN;
 902
 903         __raw_writel(tmp, LPC32XX_CLKPWR_MS_CTRL);
 904
 905         return 0;
 906 }
 907
 908 static unsigned long mmc_get_rate(struct clk *clk)
 909 {
 910         u32 div, rate, oldclk;
 911
 912         /* The MMC clock must be on when accessing an MMC register */
 913         oldclk = __raw_readl(LPC32XX_CLKPWR_MS_CTRL);
 914         __raw_writel(oldclk | LPC32XX_CLKPWR_MSCARD_SDCARD_EN,
 915                 LPC32XX_CLKPWR_MS_CTRL);
 916         div = __raw_readl(LPC32XX_CLKPWR_MS_CTRL);
 917         __raw_writel(oldclk, LPC32XX_CLKPWR_MS_CTRL);
 918
 919         /* Get the parent clock rate */
 920         rate = clk->parent->get_rate(clk->parent);
 921
 922         /* Get the MMC controller clock divider value */
 923         div = div & LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(0xf);
 924
 925         if (!div)
 926                 div = 1;
 927
 928         return rate / div;
 929 }
 930
 931 static unsigned long mmc_round_rate(struct clk *clk, unsigned long rate)
 932 {
 933         unsigned long div, prate;
 934
 935         /* Get the parent clock rate */
 936         prate = clk->parent->get_rate(clk->parent);
 937
 938         if (rate >= prate)
 939                 return prate;
 940
 941         div = prate / rate;
 942         if (div > 0xf)
 943                 div = 0xf;
 944
 945         return prate / div;
 946 }
 947
 948 static int mmc_set_rate(struct clk *clk, unsigned long rate)
 949 {
 950         u32 tmp;
 951         unsigned long prate, div, crate = mmc_round_rate(clk, rate);
 952
 953         prate = clk->parent->get_rate(clk->parent);
 954
 955         div = prate / crate;
 956
 957         /* The MMC clock must be on when accessing an MMC register */
 958         tmp = __raw_readl(LPC32XX_CLKPWR_MS_CTRL) &
 959                 ~LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(0xf);
 960         tmp |= LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(div) |
 961                 LPC32XX_CLKPWR_MSCARD_SDCARD_EN;
 962         __raw_writel(tmp, LPC32XX_CLKPWR_MS_CTRL);
 963
 964         return 0;
 965 }
 966
 967 static struct clk clk_mmc = {
 968         .parent         = &clk_armpll,
 969         .set_rate       = mmc_set_rate,
 970         .get_rate       = mmc_get_rate,
 971         .round_rate     = mmc_round_rate,
 972         .enable         = mmc_onoff_enable,
 973         .enable_reg     = LPC32XX_CLKPWR_MS_CTRL,
 974         .enable_mask    = LPC32XX_CLKPWR_MSCARD_SDCARD_EN,
 975 };
 976
 977 static unsigned long clcd_get_rate(struct clk *clk)
 978 {
 979         u32 tmp, div, rate, oldclk;
 980
 981         /* The LCD clock must be on when accessing an LCD register */
 982         oldclk = __raw_readl(LPC32XX_CLKPWR_LCDCLK_CTRL);
 983         __raw_writel(oldclk | LPC32XX_CLKPWR_LCDCTRL_CLK_EN,
 984                 LPC32XX_CLKPWR_LCDCLK_CTRL);
 985         tmp = __raw_readl(io_p2v(LPC32XX_LCD_BASE + CLCD_TIM2));
 986         __raw_writel(oldclk, LPC32XX_CLKPWR_LCDCLK_CTRL);
 987
 988         rate = clk->parent->get_rate(clk->parent);
 989
 990         /* Only supports internal clocking */
 991         if (tmp & TIM2_BCD)
 992                 return rate;
 993
 994         div = (tmp & 0x1F) | ((tmp & 0xF8) >> 22);
 995         tmp = rate / (2 + div);
 996
 997         return tmp;
 998 }
 999
1000 static int clcd_set_rate(struct clk *clk, unsigned long rate)
1001 {
1002         u32 tmp, prate, div, oldclk;
1003
1004         /* The LCD clock must be on when accessing an LCD register */
1005         oldclk = __raw_readl(LPC32XX_CLKPWR_LCDCLK_CTRL);
1006         __raw_writel(oldclk | LPC32XX_CLKPWR_LCDCTRL_CLK_EN,
1007                 LPC32XX_CLKPWR_LCDCLK_CTRL);
1008
1009         tmp = __raw_readl(io_p2v(LPC32XX_LCD_BASE + CLCD_TIM2)) | TIM2_BCD;
1010         prate = clk->parent->get_rate(clk->parent);
1011
1012         if (rate < prate) {
1013                 /* Find closest divider */
1014                 div = prate / rate;
1015                 if (div >= 2) {
1016                         div -= 2;
1017                         tmp &= ~TIM2_BCD;
1018                 }
1019
1020                 tmp &= ~(0xF800001F);
1021                 tmp |= (div & 0x1F);
1022                 tmp |= (((div >> 5) & 0x1F) << 27);
1023         }
1024
1025         __raw_writel(tmp, io_p2v(LPC32XX_LCD_BASE + CLCD_TIM2));
1026         __raw_writel(oldclk, LPC32XX_CLKPWR_LCDCLK_CTRL);
1027
1028         return 0;
1029 }
1030
1031 static unsigned long clcd_round_rate(struct clk *clk, unsigned long rate)
1032 {
1033         u32 prate, div;
1034
1035         prate = clk->parent->get_rate(clk->parent);
1036
1037         if (rate >= prate)
1038                 rate = prate;
1039         else {
1040                 div = prate / rate;
1041                 if (div > 0x3ff)
1042                         div = 0x3ff;
1043
1044                 rate = prate / div;
1045         }
1046
1047         return rate;
1048 }
1049
1050 static struct clk clk_lcd = {
1051         .parent         = &clk_hclk,
1052         .set_rate       = clcd_set_rate,
1053         .get_rate       = clcd_get_rate,
1054         .round_rate     = clcd_round_rate,
1055         .enable         = local_onoff_enable,
1056         .enable_reg     = LPC32XX_CLKPWR_LCDCLK_CTRL,
1057         .enable_mask    = LPC32XX_CLKPWR_LCDCTRL_CLK_EN,
1058 };
1059
1060 static void local_clk_disable(struct clk *clk)
1061 {
1062         /* Don't attempt to disable clock if it has no users */
1063         if (clk->usecount > 0) {
1064                 clk->usecount--;
1065
1066                 /* Only disable clock when it has no more users */
1067                 if ((clk->usecount == 0) && (clk->enable))
1068                         clk->enable(clk, 0);
1069
1070                 /* Check parent clocks, they may need to be disabled too */
1071                 if (clk->parent)
1072                         local_clk_disable(clk->parent);
1073         }
1074 }
1075
1076 static int local_clk_enable(struct clk *clk)
1077 {
1078         int ret = 0;
1079
1080         /* Enable parent clocks first and update use counts */
1081         if (clk->parent)
1082                 ret = local_clk_enable(clk->parent);
1083
1084         if (!ret) {
1085                 /* Only enable clock if it's currently disabled */
1086                 if ((clk->usecount == 0) && (clk->enable))
1087                         ret = clk->enable(clk, 1);
1088
1089                 if (!ret)
1090                         clk->usecount++;
1091                 else if (clk->parent)
1092                         local_clk_disable(clk->parent);
1093         }
1094
1095         return ret;
1096 }
1097
1098 /*
1099  * clk_enable - inform the system when the clock source should be running.
1100  */
1101 int clk_enable(struct clk *clk)
1102 {
1103         int ret;
1104         unsigned long flags;
1105
1106         spin_lock_irqsave(&global_clkregs_lock, flags);
1107         ret = local_clk_enable(clk);
1108         spin_unlock_irqrestore(&global_clkregs_lock, flags);
1109
1110         return ret;
1111 }
1112 EXPORT_SYMBOL(clk_enable);
1113
1114 /*
1115  * clk_disable - inform the system when the clock source is no longer required
1116  */
1117 void clk_disable(struct clk *clk)
1118 {
1119         unsigned long flags;
1120
1121         spin_lock_irqsave(&global_clkregs_lock, flags);
1122         local_clk_disable(clk);
1123         spin_unlock_irqrestore(&global_clkregs_lock, flags);
1124 }
1125 EXPORT_SYMBOL(clk_disable);
1126
1127 /*
1128  * clk_get_rate - obtain the current clock rate (in Hz) for a clock source
1129  */
1130 unsigned long clk_get_rate(struct clk *clk)
1131 {
1132         return clk->get_rate(clk);
1133 }
1134 EXPORT_SYMBOL(clk_get_rate);
1135
1136 /*
1137  * clk_set_rate - set the clock rate for a clock source
1138  */
1139 int clk_set_rate(struct clk *clk, unsigned long rate)
1140 {
1141         int ret = -EINVAL;
1142
1143         /*
1144          * Most system clocks can only be enabled or disabled, with
1145          * the actual rate set as part of the peripheral dividers
1146          * instead of high level clock control
1147          */
1148         if (clk->set_rate)
1149                 ret = clk->set_rate(clk, rate);
1150
1151         return ret;
1152 }
1153 EXPORT_SYMBOL(clk_set_rate);
1154
1155 /*
1156  * clk_round_rate - adjust a rate to the exact rate a clock can provide
1157  */
1158 long clk_round_rate(struct clk *clk, unsigned long rate)
1159 {
1160         if (clk->round_rate)
1161                 rate = clk->round_rate(clk, rate);
1162         else
1163                 rate = clk->get_rate(clk);
1164
1165         return rate;
1166 }
1167 EXPORT_SYMBOL(clk_round_rate);
1168
1169 /*
1170  * clk_set_parent - set the parent clock source for this clock
1171  */
1172 int clk_set_parent(struct clk *clk, struct clk *parent)
1173 {
1174         /* Clock re-parenting is not supported */
1175         return -EINVAL;
1176 }
1177 EXPORT_SYMBOL(clk_set_parent);
1178
1179 /*
1180  * clk_get_parent - get the parent clock source for this clock
1181  */
1182 struct clk *clk_get_parent(struct clk *clk)
1183 {
1184         return clk->parent;
1185 }
1186 EXPORT_SYMBOL(clk_get_parent);
1187
1188 static struct clk_lookup lookups[] = {
1189         CLKDEV_INIT(NULL, "osc_32KHz", &osc_32KHz),
1190         CLKDEV_INIT(NULL, "osc_pll397", &osc_pll397),
1191         CLKDEV_INIT(NULL, "osc_main", &osc_main),
1192         CLKDEV_INIT(NULL, "sys_ck", &clk_sys),
1193         CLKDEV_INIT(NULL, "arm_pll_ck", &clk_armpll),
1194         CLKDEV_INIT(NULL, "ck_pll5", &clk_usbpll),
1195         CLKDEV_INIT(NULL, "hclk_ck", &clk_hclk),
1196         CLKDEV_INIT(NULL, "pclk_ck", &clk_pclk),
1197         CLKDEV_INIT(NULL, "timer0_ck", &clk_timer0),
1198         CLKDEV_INIT(NULL, "timer1_ck", &clk_timer1),
1199         CLKDEV_INIT(NULL, "timer2_ck", &clk_timer2),
1200         CLKDEV_INIT(NULL, "timer3_ck", &clk_timer3),
1201         CLKDEV_INIT(NULL, "vfp9_ck", &clk_vfp9),
1202         CLKDEV_INIT("pl08xdmac", NULL, &clk_dma),
1203         CLKDEV_INIT("4003c000.watchdog", NULL, &clk_wdt),
1204         CLKDEV_INIT("4005c000.pwm", NULL, &clk_pwm),
1205         CLKDEV_INIT(NULL, "uart3_ck", &clk_uart3),
1206         CLKDEV_INIT(NULL, "uart4_ck", &clk_uart4),
1207         CLKDEV_INIT(NULL, "uart5_ck", &clk_uart5),
1208         CLKDEV_INIT(NULL, "uart6_ck", &clk_uart6),
1209         CLKDEV_INIT("400a0000.i2c", NULL, &clk_i2c0),
1210         CLKDEV_INIT("400a8000.i2c", NULL, &clk_i2c1),
1211         CLKDEV_INIT("31020300.i2c", NULL, &clk_i2c2),
1212         CLKDEV_INIT("dev:ssp0", NULL, &clk_ssp0),
1213         CLKDEV_INIT("dev:ssp1", NULL, &clk_ssp1),
1214         CLKDEV_INIT("40050000.key", NULL, &clk_kscan),
1215         CLKDEV_INIT("20020000.flash", NULL, &clk_nand),
1216         CLKDEV_INIT("200a8000.flash", NULL, &clk_nand_mlc),
1217         CLKDEV_INIT("40048000.adc", NULL, &clk_adc),
1218         CLKDEV_INIT(NULL, "i2s0_ck", &clk_i2s0),
1219         CLKDEV_INIT(NULL, "i2s1_ck", &clk_i2s1),
1220         CLKDEV_INIT("40048000.tsc", NULL, &clk_tsc),
1221         CLKDEV_INIT("20098000.sd", NULL, &clk_mmc),
1222         CLKDEV_INIT("31060000.ethernet", NULL, &clk_net),
1223         CLKDEV_INIT("dev:clcd", NULL, &clk_lcd),
1224         CLKDEV_INIT("31020000.usbd", "ck_usbd", &clk_usbd),
1225         CLKDEV_INIT("31020000.ohci", "ck_usbd", &clk_usbd),
1226         CLKDEV_INIT("31020000.usbd", "ck_usb_otg", &clk_usb_otg_dev),
1227         CLKDEV_INIT("31020000.ohci", "ck_usb_otg", &clk_usb_otg_host),
1228         CLKDEV_INIT("lpc32xx_rtc", NULL, &clk_rtc),
1229 };
1230
1231 static int __init clk_init(void)
1232 {
1233         int i;
1234
1235         for (i = 0; i < ARRAY_SIZE(lookups); i++)
1236                 clkdev_add(&lookups[i]);
1237
1238         /*
1239          * Setup muxed SYSCLK for HCLK PLL base -this selects the
1240          * parent clock used for the ARM PLL and is used to derive
1241          * the many system clock rates in the device.
1242          */
1243         if (clk_is_sysclk_mainosc() != 0)
1244                 clk_sys.parent = &osc_main;
1245         else
1246                 clk_sys.parent = &osc_pll397;
1247
1248         clk_sys.rate = clk_sys.parent->rate;
1249
1250         /* Compute the current ARM PLL and USB PLL frequencies */
1251         local_update_armpll_rate();
1252
1253         /* Compute HCLK and PCLK bus rates */
1254         clk_hclk.rate = clk_hclk.parent->rate / clk_get_hclk_div();
1255         clk_pclk.rate = clk_pclk.parent->rate / clk_get_pclk_div();
1256
1257         /*
1258          * Enable system clocks - this step is somewhat formal, as the
1259          * clocks are already running, but it does get the clock data
1260          * inline with the actual system state. Never disable these
1261          * clocks as they will only stop if the system is going to sleep.
1262          * In that case, the chip/system power management functions will
1263          * handle clock gating.
1264          */
1265         if (clk_enable(&clk_hclk) || clk_enable(&clk_pclk))
1266                 printk(KERN_ERR "Error enabling system HCLK and PCLK\n");
1267
1268         /*
1269          * Timers 0 and 1 were enabled and are being used by the high
1270          * resolution tick function prior to this driver being initialized.
1271          * Tag them now as used.
1272          */
1273         if (clk_enable(&clk_timer0) || clk_enable(&clk_timer1))
1274                 printk(KERN_ERR "Error enabling timer tick clocks\n");
1275
1276         return 0;
1277 }
1278 core_initcall(clk_init);
1279