Merge remote-tracking branch 'moduleh/module.h-split'

[linux-2.6/next.git] / arch / arm / mach-imx / clock-imx21.c

/*
 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
 * Copyright 2008 Martin Fuzzey, mfuzzey@gmail.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/clkdev.h>

#include <mach/clock.h>
#include <mach/hardware.h>
#include <mach/common.h>
#include <asm/div64.h>

#define IO_ADDR_CCM(off)        (MX21_IO_ADDRESS(MX21_CCM_BASE_ADDR + (off)))

/* Register offsets */
#define CCM_CSCR                IO_ADDR_CCM(0x0)
#define CCM_MPCTL0              IO_ADDR_CCM(0x4)
#define CCM_MPCTL1              IO_ADDR_CCM(0x8)
#define CCM_SPCTL0              IO_ADDR_CCM(0xc)
#define CCM_SPCTL1              IO_ADDR_CCM(0x10)
#define CCM_OSC26MCTL           IO_ADDR_CCM(0x14)
#define CCM_PCDR0               IO_ADDR_CCM(0x18)
#define CCM_PCDR1               IO_ADDR_CCM(0x1c)
#define CCM_PCCR0               IO_ADDR_CCM(0x20)
#define CCM_PCCR1               IO_ADDR_CCM(0x24)
#define CCM_CCSR                IO_ADDR_CCM(0x28)
#define CCM_PMCTL               IO_ADDR_CCM(0x2c)
#define CCM_PMCOUNT             IO_ADDR_CCM(0x30)
#define CCM_WKGDCTL             IO_ADDR_CCM(0x34)

#define CCM_CSCR_PRESC_OFFSET   29
#define CCM_CSCR_PRESC_MASK     (0x7 << CCM_CSCR_PRESC_OFFSET)

#define CCM_CSCR_USB_OFFSET     26
#define CCM_CSCR_USB_MASK       (0x7 << CCM_CSCR_USB_OFFSET)
#define CCM_CSCR_SD_OFFSET      24
#define CCM_CSCR_SD_MASK        (0x3 << CCM_CSCR_SD_OFFSET)
#define CCM_CSCR_SPLLRES        (1 << 22)
#define CCM_CSCR_MPLLRES        (1 << 21)
#define CCM_CSCR_SSI2_OFFSET    20
#define CCM_CSCR_SSI2           (1 << CCM_CSCR_SSI2_OFFSET)
#define CCM_CSCR_SSI1_OFFSET    19
#define CCM_CSCR_SSI1           (1 << CCM_CSCR_SSI1_OFFSET)
#define CCM_CSCR_FIR_OFFSET     18
#define CCM_CSCR_FIR            (1 << CCM_CSCR_FIR_OFFSET)
#define CCM_CSCR_SP             (1 << 17)
#define CCM_CSCR_MCU            (1 << 16)
#define CCM_CSCR_BCLK_OFFSET    10
#define CCM_CSCR_BCLK_MASK      (0xf << CCM_CSCR_BCLK_OFFSET)
#define CCM_CSCR_IPDIV_OFFSET   9
#define CCM_CSCR_IPDIV          (1 << CCM_CSCR_IPDIV_OFFSET)

#define CCM_CSCR_OSC26MDIV      (1 << 4)
#define CCM_CSCR_OSC26M         (1 << 3)
#define CCM_CSCR_FPM            (1 << 2)
#define CCM_CSCR_SPEN           (1 << 1)
#define CCM_CSCR_MPEN           1

#define CCM_MPCTL0_CPLM         (1 << 31)
#define CCM_MPCTL0_PD_OFFSET    26
#define CCM_MPCTL0_PD_MASK      (0xf << 26)
#define CCM_MPCTL0_MFD_OFFSET   16
#define CCM_MPCTL0_MFD_MASK     (0x3ff << 16)
#define CCM_MPCTL0_MFI_OFFSET   10
#define CCM_MPCTL0_MFI_MASK     (0xf << 10)
#define CCM_MPCTL0_MFN_OFFSET   0
#define CCM_MPCTL0_MFN_MASK     0x3ff

#define CCM_MPCTL1_LF           (1 << 15)
#define CCM_MPCTL1_BRMO         (1 << 6)

#define CCM_SPCTL0_CPLM         (1 << 31)
#define CCM_SPCTL0_PD_OFFSET    26
#define CCM_SPCTL0_PD_MASK      (0xf << 26)
#define CCM_SPCTL0_MFD_OFFSET   16
#define CCM_SPCTL0_MFD_MASK     (0x3ff << 16)
#define CCM_SPCTL0_MFI_OFFSET   10
#define CCM_SPCTL0_MFI_MASK     (0xf << 10)
#define CCM_SPCTL0_MFN_OFFSET   0
#define CCM_SPCTL0_MFN_MASK     0x3ff

#define CCM_SPCTL1_LF           (1 << 15)
#define CCM_SPCTL1_BRMO         (1 << 6)

#define CCM_OSC26MCTL_PEAK_OFFSET       16
#define CCM_OSC26MCTL_PEAK_MASK         (0x3 << 16)
#define CCM_OSC26MCTL_AGC_OFFSET        8
#define CCM_OSC26MCTL_AGC_MASK          (0x3f << 8)
#define CCM_OSC26MCTL_ANATEST_OFFSET    0
#define CCM_OSC26MCTL_ANATEST_MASK      0x3f

#define CCM_PCDR0_SSI2BAUDDIV_OFFSET    26
#define CCM_PCDR0_SSI2BAUDDIV_MASK      (0x3f << 26)
#define CCM_PCDR0_SSI1BAUDDIV_OFFSET    16
#define CCM_PCDR0_SSI1BAUDDIV_MASK      (0x3f << 16)
#define CCM_PCDR0_NFCDIV_OFFSET         12
#define CCM_PCDR0_NFCDIV_MASK           (0xf << 12)
#define CCM_PCDR0_48MDIV_OFFSET         5
#define CCM_PCDR0_48MDIV_MASK           (0x7 << CCM_PCDR0_48MDIV_OFFSET)
#define CCM_PCDR0_FIRIDIV_OFFSET        0
#define CCM_PCDR0_FIRIDIV_MASK          0x1f
#define CCM_PCDR1_PERDIV4_OFFSET        24
#define CCM_PCDR1_PERDIV4_MASK          (0x3f << 24)
#define CCM_PCDR1_PERDIV3_OFFSET        16
#define CCM_PCDR1_PERDIV3_MASK          (0x3f << 16)
#define CCM_PCDR1_PERDIV2_OFFSET        8
#define CCM_PCDR1_PERDIV2_MASK          (0x3f << 8)
#define CCM_PCDR1_PERDIV1_OFFSET        0
#define CCM_PCDR1_PERDIV1_MASK          0x3f

#define CCM_PCCR_HCLK_CSI_OFFSET        31
#define CCM_PCCR_HCLK_CSI_REG           CCM_PCCR0
#define CCM_PCCR_HCLK_DMA_OFFSET        30
#define CCM_PCCR_HCLK_DMA_REG           CCM_PCCR0
#define CCM_PCCR_HCLK_BROM_OFFSET       28
#define CCM_PCCR_HCLK_BROM_REG          CCM_PCCR0
#define CCM_PCCR_HCLK_EMMA_OFFSET       27
#define CCM_PCCR_HCLK_EMMA_REG          CCM_PCCR0
#define CCM_PCCR_HCLK_LCDC_OFFSET       26
#define CCM_PCCR_HCLK_LCDC_REG          CCM_PCCR0
#define CCM_PCCR_HCLK_SLCDC_OFFSET      25
#define CCM_PCCR_HCLK_SLCDC_REG         CCM_PCCR0
#define CCM_PCCR_HCLK_USBOTG_OFFSET     24
#define CCM_PCCR_HCLK_USBOTG_REG        CCM_PCCR0
#define CCM_PCCR_HCLK_BMI_OFFSET        23
#define CCM_PCCR_BMI_MASK               (1 << CCM_PCCR_BMI_MASK)
#define CCM_PCCR_HCLK_BMI_REG           CCM_PCCR0
#define CCM_PCCR_PERCLK4_OFFSET         22
#define CCM_PCCR_PERCLK4_REG            CCM_PCCR0
#define CCM_PCCR_SLCDC_OFFSET           21
#define CCM_PCCR_SLCDC_REG              CCM_PCCR0
#define CCM_PCCR_FIRI_BAUD_OFFSET       20
#define CCM_PCCR_FIRI_BAUD_MASK         (1 << CCM_PCCR_FIRI_BAUD_MASK)
#define CCM_PCCR_FIRI_BAUD_REG          CCM_PCCR0
#define CCM_PCCR_NFC_OFFSET             19
#define CCM_PCCR_NFC_REG                CCM_PCCR0
#define CCM_PCCR_LCDC_OFFSET            18
#define CCM_PCCR_LCDC_REG               CCM_PCCR0
#define CCM_PCCR_SSI1_BAUD_OFFSET       17
#define CCM_PCCR_SSI1_BAUD_REG          CCM_PCCR0
#define CCM_PCCR_SSI2_BAUD_OFFSET       16
#define CCM_PCCR_SSI2_BAUD_REG          CCM_PCCR0
#define CCM_PCCR_EMMA_OFFSET            15
#define CCM_PCCR_EMMA_REG               CCM_PCCR0
#define CCM_PCCR_USBOTG_OFFSET          14
#define CCM_PCCR_USBOTG_REG             CCM_PCCR0
#define CCM_PCCR_DMA_OFFSET             13
#define CCM_PCCR_DMA_REG                CCM_PCCR0
#define CCM_PCCR_I2C1_OFFSET            12
#define CCM_PCCR_I2C1_REG               CCM_PCCR0
#define CCM_PCCR_GPIO_OFFSET            11
#define CCM_PCCR_GPIO_REG               CCM_PCCR0
#define CCM_PCCR_SDHC2_OFFSET           10
#define CCM_PCCR_SDHC2_REG              CCM_PCCR0
#define CCM_PCCR_SDHC1_OFFSET           9
#define CCM_PCCR_SDHC1_REG              CCM_PCCR0
#define CCM_PCCR_FIRI_OFFSET            8
#define CCM_PCCR_FIRI_MASK              (1 << CCM_PCCR_BAUD_MASK)
#define CCM_PCCR_FIRI_REG               CCM_PCCR0
#define CCM_PCCR_SSI2_IPG_OFFSET        7
#define CCM_PCCR_SSI2_REG               CCM_PCCR0
#define CCM_PCCR_SSI1_IPG_OFFSET        6
#define CCM_PCCR_SSI1_REG               CCM_PCCR0
#define CCM_PCCR_CSPI2_OFFSET           5
#define CCM_PCCR_CSPI2_REG              CCM_PCCR0
#define CCM_PCCR_CSPI1_OFFSET           4
#define CCM_PCCR_CSPI1_REG              CCM_PCCR0
#define CCM_PCCR_UART4_OFFSET           3
#define CCM_PCCR_UART4_REG              CCM_PCCR0
#define CCM_PCCR_UART3_OFFSET           2
#define CCM_PCCR_UART3_REG              CCM_PCCR0
#define CCM_PCCR_UART2_OFFSET           1
#define CCM_PCCR_UART2_REG              CCM_PCCR0
#define CCM_PCCR_UART1_OFFSET           0
#define CCM_PCCR_UART1_REG              CCM_PCCR0

#define CCM_PCCR_OWIRE_OFFSET           31
#define CCM_PCCR_OWIRE_REG              CCM_PCCR1
#define CCM_PCCR_KPP_OFFSET             30
#define CCM_PCCR_KPP_REG                CCM_PCCR1
#define CCM_PCCR_RTC_OFFSET             29
#define CCM_PCCR_RTC_REG                CCM_PCCR1
#define CCM_PCCR_PWM_OFFSET             28
#define CCM_PCCR_PWM_REG                CCM_PCCR1
#define CCM_PCCR_GPT3_OFFSET            27
#define CCM_PCCR_GPT3_REG               CCM_PCCR1
#define CCM_PCCR_GPT2_OFFSET            26
#define CCM_PCCR_GPT2_REG               CCM_PCCR1
#define CCM_PCCR_GPT1_OFFSET            25
#define CCM_PCCR_GPT1_REG               CCM_PCCR1
#define CCM_PCCR_WDT_OFFSET             24
#define CCM_PCCR_WDT_REG                CCM_PCCR1
#define CCM_PCCR_CSPI3_OFFSET           23
#define CCM_PCCR_CSPI3_REG              CCM_PCCR1

#define CCM_PCCR_CSPI1_MASK             (1 << CCM_PCCR_CSPI1_OFFSET)
#define CCM_PCCR_CSPI2_MASK             (1 << CCM_PCCR_CSPI2_OFFSET)
#define CCM_PCCR_CSPI3_MASK             (1 << CCM_PCCR_CSPI3_OFFSET)
#define CCM_PCCR_DMA_MASK               (1 << CCM_PCCR_DMA_OFFSET)
#define CCM_PCCR_EMMA_MASK              (1 << CCM_PCCR_EMMA_OFFSET)
#define CCM_PCCR_GPIO_MASK              (1 << CCM_PCCR_GPIO_OFFSET)
#define CCM_PCCR_GPT1_MASK              (1 << CCM_PCCR_GPT1_OFFSET)
#define CCM_PCCR_GPT2_MASK              (1 << CCM_PCCR_GPT2_OFFSET)
#define CCM_PCCR_GPT3_MASK              (1 << CCM_PCCR_GPT3_OFFSET)
#define CCM_PCCR_HCLK_BROM_MASK         (1 << CCM_PCCR_HCLK_BROM_OFFSET)
#define CCM_PCCR_HCLK_CSI_MASK          (1 << CCM_PCCR_HCLK_CSI_OFFSET)
#define CCM_PCCR_HCLK_DMA_MASK          (1 << CCM_PCCR_HCLK_DMA_OFFSET)
#define CCM_PCCR_HCLK_EMMA_MASK         (1 << CCM_PCCR_HCLK_EMMA_OFFSET)
#define CCM_PCCR_HCLK_LCDC_MASK         (1 << CCM_PCCR_HCLK_LCDC_OFFSET)
#define CCM_PCCR_HCLK_SLCDC_MASK        (1 << CCM_PCCR_HCLK_SLCDC_OFFSET)
#define CCM_PCCR_HCLK_USBOTG_MASK       (1 << CCM_PCCR_HCLK_USBOTG_OFFSET)
#define CCM_PCCR_I2C1_MASK              (1 << CCM_PCCR_I2C1_OFFSET)
#define CCM_PCCR_KPP_MASK               (1 << CCM_PCCR_KPP_OFFSET)
#define CCM_PCCR_LCDC_MASK              (1 << CCM_PCCR_LCDC_OFFSET)
#define CCM_PCCR_NFC_MASK               (1 << CCM_PCCR_NFC_OFFSET)
#define CCM_PCCR_OWIRE_MASK             (1 << CCM_PCCR_OWIRE_OFFSET)
#define CCM_PCCR_PERCLK4_MASK           (1 << CCM_PCCR_PERCLK4_OFFSET)
#define CCM_PCCR_PWM_MASK               (1 << CCM_PCCR_PWM_OFFSET)
#define CCM_PCCR_RTC_MASK               (1 << CCM_PCCR_RTC_OFFSET)
#define CCM_PCCR_SDHC1_MASK             (1 << CCM_PCCR_SDHC1_OFFSET)
#define CCM_PCCR_SDHC2_MASK             (1 << CCM_PCCR_SDHC2_OFFSET)
#define CCM_PCCR_SLCDC_MASK             (1 << CCM_PCCR_SLCDC_OFFSET)
#define CCM_PCCR_SSI1_BAUD_MASK         (1 << CCM_PCCR_SSI1_BAUD_OFFSET)
#define CCM_PCCR_SSI1_IPG_MASK          (1 << CCM_PCCR_SSI1_IPG_OFFSET)
#define CCM_PCCR_SSI2_BAUD_MASK         (1 << CCM_PCCR_SSI2_BAUD_OFFSET)
#define CCM_PCCR_SSI2_IPG_MASK          (1 << CCM_PCCR_SSI2_IPG_OFFSET)
#define CCM_PCCR_UART1_MASK             (1 << CCM_PCCR_UART1_OFFSET)
#define CCM_PCCR_UART2_MASK             (1 << CCM_PCCR_UART2_OFFSET)
#define CCM_PCCR_UART3_MASK             (1 << CCM_PCCR_UART3_OFFSET)
#define CCM_PCCR_UART4_MASK             (1 << CCM_PCCR_UART4_OFFSET)
#define CCM_PCCR_USBOTG_MASK            (1 << CCM_PCCR_USBOTG_OFFSET)
#define CCM_PCCR_WDT_MASK               (1 << CCM_PCCR_WDT_OFFSET)

#define CCM_CCSR_32KSR          (1 << 15)

#define CCM_CCSR_CLKMODE1       (1 << 9)
#define CCM_CCSR_CLKMODE0       (1 << 8)

#define CCM_CCSR_CLKOSEL_OFFSET 0
#define CCM_CCSR_CLKOSEL_MASK   0x1f

#define SYS_FMCR                0x14    /* Functional Muxing Control Reg */
#define SYS_CHIP_ID             0x00    /* The offset of CHIP ID register */

static int _clk_enable(struct clk *clk)
{
        u32 reg;

        reg = __raw_readl(clk->enable_reg);
        reg |= 1 << clk->enable_shift;
        __raw_writel(reg, clk->enable_reg);
        return 0;
}

static void _clk_disable(struct clk *clk)
{
        u32 reg;

        reg = __raw_readl(clk->enable_reg);
        reg &= ~(1 << clk->enable_shift);
        __raw_writel(reg, clk->enable_reg);
}

static unsigned long _clk_generic_round_rate(struct clk *clk,
                        unsigned long rate,
                        u32 max_divisor)
{
        u32 div;
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        div = parent_rate / rate;
        if (parent_rate % rate)
                div++;

        if (div > max_divisor)
                div = max_divisor;

        return parent_rate / div;
}

static int _clk_spll_enable(struct clk *clk)
{
        u32 reg;

        reg = __raw_readl(CCM_CSCR);
        reg |= CCM_CSCR_SPEN;
        __raw_writel(reg, CCM_CSCR);

        while ((__raw_readl(CCM_SPCTL1) & CCM_SPCTL1_LF) == 0)
                ;
        return 0;
}

static void _clk_spll_disable(struct clk *clk)
{
        u32 reg;

        reg = __raw_readl(CCM_CSCR);
        reg &= ~CCM_CSCR_SPEN;
        __raw_writel(reg, CCM_CSCR);
}


#define CSCR() (__raw_readl(CCM_CSCR))
#define PCDR0() (__raw_readl(CCM_PCDR0))
#define PCDR1() (__raw_readl(CCM_PCDR1))

static unsigned long _clk_perclkx_round_rate(struct clk *clk,
                                             unsigned long rate)
{
        return _clk_generic_round_rate(clk, rate, 64);
}

static int _clk_perclkx_set_rate(struct clk *clk, unsigned long rate)
{
        u32 reg;
        u32 div;
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        if (clk->id < 0 || clk->id > 3)
                return -EINVAL;

        div = parent_rate / rate;
        if (div > 64 || div < 1 || ((parent_rate / div) != rate))
                return -EINVAL;
        div--;

        reg =
            __raw_readl(CCM_PCDR1) & ~(CCM_PCDR1_PERDIV1_MASK <<
                                       (clk->id << 3));
        reg |= div << (clk->id << 3);
        __raw_writel(reg, CCM_PCDR1);

        return 0;
}

static unsigned long _clk_usb_recalc(struct clk *clk)
{
        unsigned long usb_pdf;
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        usb_pdf = (CSCR() & CCM_CSCR_USB_MASK) >> CCM_CSCR_USB_OFFSET;

        return parent_rate / (usb_pdf + 1U);
}

static unsigned long _clk_usb_round_rate(struct clk *clk,
                                             unsigned long rate)
{
        return _clk_generic_round_rate(clk, rate, 8);
}

static int _clk_usb_set_rate(struct clk *clk, unsigned long rate)
{
        u32 reg;
        u32 div;
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        div = parent_rate / rate;
        if (div > 8 || div < 1 || ((parent_rate / div) != rate))
                return -EINVAL;
        div--;

        reg = CSCR() & ~CCM_CSCR_USB_MASK;
        reg |= div << CCM_CSCR_USB_OFFSET;
        __raw_writel(reg, CCM_CSCR);

        return 0;
}

static unsigned long _clk_ssix_recalc(struct clk *clk, unsigned long pdf)
{
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        pdf = (pdf < 2) ? 124UL : pdf;  /* MX21 & MX27 TO1 */

        return 2UL * parent_rate / pdf;
}

static unsigned long _clk_ssi1_recalc(struct clk *clk)
{
        return _clk_ssix_recalc(clk,
                (PCDR0() & CCM_PCDR0_SSI1BAUDDIV_MASK)
                >> CCM_PCDR0_SSI1BAUDDIV_OFFSET);
}

static unsigned long _clk_ssi2_recalc(struct clk *clk)
{
        return _clk_ssix_recalc(clk,
                (PCDR0() & CCM_PCDR0_SSI2BAUDDIV_MASK) >>
                CCM_PCDR0_SSI2BAUDDIV_OFFSET);
}

static unsigned long _clk_nfc_recalc(struct clk *clk)
{
        unsigned long nfc_pdf;
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        nfc_pdf = (PCDR0() & CCM_PCDR0_NFCDIV_MASK)
                >> CCM_PCDR0_NFCDIV_OFFSET;

        return parent_rate / (nfc_pdf + 1);
}

static unsigned long _clk_parent_round_rate(struct clk *clk, unsigned long rate)
{
        return clk->parent->round_rate(clk->parent, rate);
}

static int _clk_parent_set_rate(struct clk *clk, unsigned long rate)
{
        return clk->parent->set_rate(clk->parent, rate);
}

static unsigned long external_high_reference; /* in Hz */

static unsigned long get_high_reference_clock_rate(struct clk *clk)
{
        return external_high_reference;
}

/*
 * the high frequency external clock reference
 * Default case is 26MHz.
 */
static struct clk ckih_clk = {
        .get_rate = get_high_reference_clock_rate,
};

static unsigned long external_low_reference; /* in Hz */

static unsigned long get_low_reference_clock_rate(struct clk *clk)
{
        return external_low_reference;
}

/*
 * the low frequency external clock reference
 * Default case is 32.768kHz.
 */
static struct clk ckil_clk = {
        .get_rate = get_low_reference_clock_rate,
};


static unsigned long _clk_fpm_recalc(struct clk *clk)
{
        return clk_get_rate(clk->parent) * 512;
}

/* Output of frequency pre multiplier */
static struct clk fpm_clk = {
        .parent = &ckil_clk,
        .get_rate = _clk_fpm_recalc,
};

static unsigned long get_mpll_clk(struct clk *clk)
{
        uint32_t reg;
        unsigned long ref_clk;
        unsigned long mfi = 0, mfn = 0, mfd = 0, pdf = 0;
        unsigned long long temp;

        ref_clk = clk_get_rate(clk->parent);

        reg = __raw_readl(CCM_MPCTL0);
        pdf = (reg & CCM_MPCTL0_PD_MASK)  >> CCM_MPCTL0_PD_OFFSET;
        mfd = (reg & CCM_MPCTL0_MFD_MASK) >> CCM_MPCTL0_MFD_OFFSET;
        mfi = (reg & CCM_MPCTL0_MFI_MASK) >> CCM_MPCTL0_MFI_OFFSET;
        mfn = (reg & CCM_MPCTL0_MFN_MASK) >> CCM_MPCTL0_MFN_OFFSET;

        mfi = (mfi <= 5) ? 5 : mfi;
        temp = 2LL * ref_clk * mfn;
        do_div(temp, mfd + 1);
        temp = 2LL * ref_clk * mfi + temp;
        do_div(temp, pdf + 1);

        return (unsigned long)temp;
}

static struct clk mpll_clk = {
        .parent = &ckih_clk,
        .get_rate = get_mpll_clk,
};

static unsigned long _clk_fclk_get_rate(struct clk *clk)
{
        unsigned long parent_rate;
        u32 div;

        div = (CSCR() & CCM_CSCR_PRESC_MASK) >> CCM_CSCR_PRESC_OFFSET;
        parent_rate = clk_get_rate(clk->parent);

        return parent_rate / (div+1);
}

static struct clk fclk_clk = {
        .parent = &mpll_clk,
        .get_rate = _clk_fclk_get_rate
};

static unsigned long get_spll_clk(struct clk *clk)
{
        uint32_t reg;
        unsigned long ref_clk;
        unsigned long mfi = 0, mfn = 0, mfd = 0, pdf = 0;
        unsigned long long temp;

        ref_clk = clk_get_rate(clk->parent);

        reg = __raw_readl(CCM_SPCTL0);
        pdf = (reg & CCM_SPCTL0_PD_MASK) >> CCM_SPCTL0_PD_OFFSET;
        mfd = (reg & CCM_SPCTL0_MFD_MASK) >> CCM_SPCTL0_MFD_OFFSET;
        mfi = (reg & CCM_SPCTL0_MFI_MASK) >> CCM_SPCTL0_MFI_OFFSET;
        mfn = (reg & CCM_SPCTL0_MFN_MASK) >> CCM_SPCTL0_MFN_OFFSET;

        mfi = (mfi <= 5) ? 5 : mfi;
        temp = 2LL * ref_clk * mfn;
        do_div(temp, mfd + 1);
        temp = 2LL * ref_clk * mfi + temp;
        do_div(temp, pdf + 1);

        return (unsigned long)temp;
}

static struct clk spll_clk = {
        .parent = &ckih_clk,
        .get_rate = get_spll_clk,
        .enable = _clk_spll_enable,
        .disable = _clk_spll_disable,
};

static unsigned long get_hclk_clk(struct clk *clk)
{
        unsigned long rate;
        unsigned long bclk_pdf;

        bclk_pdf = (CSCR() & CCM_CSCR_BCLK_MASK)
                >> CCM_CSCR_BCLK_OFFSET;

        rate = clk_get_rate(clk->parent);
        return rate / (bclk_pdf + 1);
}

static struct clk hclk_clk = {
        .parent = &fclk_clk,
        .get_rate = get_hclk_clk,
};

static unsigned long get_ipg_clk(struct clk *clk)
{
        unsigned long rate;
        unsigned long ipg_pdf;

        ipg_pdf = (CSCR() & CCM_CSCR_IPDIV) >> CCM_CSCR_IPDIV_OFFSET;

        rate = clk_get_rate(clk->parent);
        return rate / (ipg_pdf + 1);
}

static struct clk ipg_clk = {
        .parent = &hclk_clk,
        .get_rate = get_ipg_clk,
};

static unsigned long _clk_perclkx_recalc(struct clk *clk)
{
        unsigned long perclk_pdf;
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        if (clk->id < 0 || clk->id > 3)
                return 0;

        perclk_pdf = (PCDR1() >> (clk->id << 3)) & CCM_PCDR1_PERDIV1_MASK;

        return parent_rate / (perclk_pdf + 1);
}

static struct clk per_clk[] = {
        {
                .id = 0,
                .parent = &mpll_clk,
                .get_rate = _clk_perclkx_recalc,
        }, {
                .id = 1,
                .parent = &mpll_clk,
                .get_rate = _clk_perclkx_recalc,
        }, {
                .id = 2,
                .parent = &mpll_clk,
                .round_rate = _clk_perclkx_round_rate,
                .set_rate = _clk_perclkx_set_rate,
                .get_rate = _clk_perclkx_recalc,
                /* Enable/Disable done via lcd_clkc[1] */
        }, {
                .id = 3,
                .parent = &mpll_clk,
                .round_rate = _clk_perclkx_round_rate,
                .set_rate = _clk_perclkx_set_rate,
                .get_rate = _clk_perclkx_recalc,
                /* Enable/Disable done via csi_clk[1] */
        },
};

static struct clk uart_ipg_clk[];

static struct clk uart_clk[] = {
        {
                .id = 0,
                .parent = &per_clk[0],
                .secondary = &uart_ipg_clk[0],
        }, {
                .id = 1,
                .parent = &per_clk[0],
                .secondary = &uart_ipg_clk[1],
        }, {
                .id = 2,
                .parent = &per_clk[0],
                .secondary = &uart_ipg_clk[2],
        }, {
                .id = 3,
                .parent = &per_clk[0],
                .secondary = &uart_ipg_clk[3],
        },
};

static struct clk uart_ipg_clk[] = {
        {
                .id = 0,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_UART1_REG,
                .enable_shift = CCM_PCCR_UART1_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 1,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_UART2_REG,
                .enable_shift = CCM_PCCR_UART2_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 2,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_UART3_REG,
                .enable_shift = CCM_PCCR_UART3_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 3,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_UART4_REG,
                .enable_shift = CCM_PCCR_UART4_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk gpt_ipg_clk[];

static struct clk gpt_clk[] = {
        {
                .id = 0,
                .parent = &per_clk[0],
                .secondary = &gpt_ipg_clk[0],
        }, {
                .id = 1,
                .parent = &per_clk[0],
                .secondary = &gpt_ipg_clk[1],
        }, {
                .id = 2,
                .parent = &per_clk[0],
                .secondary = &gpt_ipg_clk[2],
        },
};

static struct clk gpt_ipg_clk[] = {
        {
                .id = 0,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_GPT1_REG,
                .enable_shift = CCM_PCCR_GPT1_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 1,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_GPT2_REG,
                .enable_shift = CCM_PCCR_GPT2_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 2,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_GPT3_REG,
                .enable_shift = CCM_PCCR_GPT3_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk pwm_clk[] = {
        {
                .parent = &per_clk[0],
                .secondary = &pwm_clk[1],
        }, {
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_PWM_REG,
                .enable_shift = CCM_PCCR_PWM_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk sdhc_ipg_clk[];

static struct clk sdhc_clk[] = {
        {
                .id = 0,
                .parent = &per_clk[1],
                .secondary = &sdhc_ipg_clk[0],
        }, {
                .id = 1,
                .parent = &per_clk[1],
                .secondary = &sdhc_ipg_clk[1],
        },
};

static struct clk sdhc_ipg_clk[] = {
        {
                .id = 0,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_SDHC1_REG,
                .enable_shift = CCM_PCCR_SDHC1_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 1,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_SDHC2_REG,
                .enable_shift = CCM_PCCR_SDHC2_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk cspi_ipg_clk[];

static struct clk cspi_clk[] = {
        {
                .id = 0,
                .parent = &per_clk[1],
                .secondary = &cspi_ipg_clk[0],
        }, {
                .id = 1,
                .parent = &per_clk[1],
                .secondary = &cspi_ipg_clk[1],
        }, {
                .id = 2,
                .parent = &per_clk[1],
                .secondary = &cspi_ipg_clk[2],
        },
};

static struct clk cspi_ipg_clk[] = {
        {
                .id = 0,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_CSPI1_REG,
                .enable_shift = CCM_PCCR_CSPI1_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 1,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_CSPI2_REG,
                .enable_shift = CCM_PCCR_CSPI2_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 3,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_CSPI3_REG,
                .enable_shift = CCM_PCCR_CSPI3_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk lcdc_clk[] = {
        {
                .parent = &per_clk[2],
                .secondary = &lcdc_clk[1],
                .round_rate = _clk_parent_round_rate,
                .set_rate = _clk_parent_set_rate,
        }, {
                .parent = &ipg_clk,
                .secondary = &lcdc_clk[2],
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_LCDC_REG,
                .enable_shift = CCM_PCCR_LCDC_OFFSET,
                .disable = _clk_disable,
        }, {
                .parent = &hclk_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_HCLK_LCDC_REG,
                .enable_shift = CCM_PCCR_HCLK_LCDC_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk csi_clk[] = {
        {
                .parent = &per_clk[3],
                .secondary = &csi_clk[1],
                .round_rate = _clk_parent_round_rate,
                .set_rate = _clk_parent_set_rate,
        }, {
                .parent = &hclk_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_HCLK_CSI_REG,
                .enable_shift = CCM_PCCR_HCLK_CSI_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk usb_clk[] = {
        {
                .parent = &spll_clk,
                .secondary = &usb_clk[1],
                .get_rate = _clk_usb_recalc,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_USBOTG_REG,
                .enable_shift = CCM_PCCR_USBOTG_OFFSET,
                .disable = _clk_disable,
                .round_rate = _clk_usb_round_rate,
                .set_rate = _clk_usb_set_rate,
        }, {
                .parent = &hclk_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_HCLK_USBOTG_REG,
                .enable_shift = CCM_PCCR_HCLK_USBOTG_OFFSET,
                .disable = _clk_disable,
        }
};

static struct clk ssi_ipg_clk[];

static struct clk ssi_clk[] = {
        {
                .id = 0,
                .parent = &mpll_clk,
                .secondary = &ssi_ipg_clk[0],
                .get_rate = _clk_ssi1_recalc,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_SSI1_BAUD_REG,
                .enable_shift = CCM_PCCR_SSI1_BAUD_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 1,
                .parent = &mpll_clk,
                .secondary = &ssi_ipg_clk[1],
                .get_rate = _clk_ssi2_recalc,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_SSI2_BAUD_REG,
                .enable_shift = CCM_PCCR_SSI2_BAUD_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk ssi_ipg_clk[] = {
        {
                .id = 0,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_SSI1_REG,
                .enable_shift = CCM_PCCR_SSI1_IPG_OFFSET,
                .disable = _clk_disable,
        }, {
                .id = 1,
                .parent = &ipg_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_SSI2_REG,
                .enable_shift = CCM_PCCR_SSI2_IPG_OFFSET,
                .disable = _clk_disable,
        },
};


static struct clk nfc_clk = {
        .parent = &fclk_clk,
        .get_rate = _clk_nfc_recalc,
        .enable = _clk_enable,
        .enable_reg = CCM_PCCR_NFC_REG,
        .enable_shift = CCM_PCCR_NFC_OFFSET,
        .disable = _clk_disable,
};

static struct clk dma_clk[] = {
        {
                .parent = &hclk_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_DMA_REG,
                .enable_shift = CCM_PCCR_DMA_OFFSET,
                .disable = _clk_disable,
                .secondary = &dma_clk[1],
        },  {
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_HCLK_DMA_REG,
                .enable_shift = CCM_PCCR_HCLK_DMA_OFFSET,
                .disable = _clk_disable,
        },
};

static struct clk brom_clk = {
        .parent = &hclk_clk,
        .enable = _clk_enable,
        .enable_reg = CCM_PCCR_HCLK_BROM_REG,
        .enable_shift = CCM_PCCR_HCLK_BROM_OFFSET,
        .disable = _clk_disable,
};

static struct clk emma_clk[] = {
        {
                .parent = &hclk_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_EMMA_REG,
                .enable_shift = CCM_PCCR_EMMA_OFFSET,
                .disable = _clk_disable,
                .secondary = &emma_clk[1],
        }, {
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_HCLK_EMMA_REG,
                .enable_shift = CCM_PCCR_HCLK_EMMA_OFFSET,
                .disable = _clk_disable,
        }
};

static struct clk slcdc_clk[] = {
        {
                .parent = &hclk_clk,
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_SLCDC_REG,
                .enable_shift = CCM_PCCR_SLCDC_OFFSET,
                .disable = _clk_disable,
                .secondary = &slcdc_clk[1],
        }, {
                .enable = _clk_enable,
                .enable_reg = CCM_PCCR_HCLK_SLCDC_REG,
                .enable_shift = CCM_PCCR_HCLK_SLCDC_OFFSET,
                .disable = _clk_disable,
        }
};

static struct clk wdog_clk = {
        .parent = &ipg_clk,
        .enable = _clk_enable,
        .enable_reg = CCM_PCCR_WDT_REG,
        .enable_shift = CCM_PCCR_WDT_OFFSET,
        .disable = _clk_disable,
};

static struct clk gpio_clk = {
        .parent = &ipg_clk,
        .enable = _clk_enable,
        .enable_reg = CCM_PCCR_GPIO_REG,
        .enable_shift = CCM_PCCR_GPIO_OFFSET,
        .disable = _clk_disable,
};

static struct clk i2c_clk = {
        .id = 0,
        .parent = &ipg_clk,
        .enable = _clk_enable,
        .enable_reg = CCM_PCCR_I2C1_REG,
        .enable_shift = CCM_PCCR_I2C1_OFFSET,
        .disable = _clk_disable,
};

static struct clk kpp_clk = {
        .parent = &ipg_clk,
        .enable = _clk_enable,
        .enable_reg = CCM_PCCR_KPP_REG,
        .enable_shift = CCM_PCCR_KPP_OFFSET,
        .disable = _clk_disable,
};

static struct clk owire_clk = {
        .parent = &ipg_clk,
        .enable = _clk_enable,
        .enable_reg = CCM_PCCR_OWIRE_REG,
        .enable_shift = CCM_PCCR_OWIRE_OFFSET,
        .disable = _clk_disable,
};

static struct clk rtc_clk = {
        .parent = &ipg_clk,
        .enable = _clk_enable,
        .enable_reg = CCM_PCCR_RTC_REG,
        .enable_shift = CCM_PCCR_RTC_OFFSET,
        .disable = _clk_disable,
};

static unsigned long _clk_clko_round_rate(struct clk *clk, unsigned long rate)
{
        return _clk_generic_round_rate(clk, rate, 8);
}

static int _clk_clko_set_rate(struct clk *clk, unsigned long rate)
{
        u32 reg;
        u32 div;
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        div = parent_rate / rate;

        if (div > 8 || div < 1 || ((parent_rate / div) != rate))
                return -EINVAL;
        div--;

        reg = __raw_readl(CCM_PCDR0);

        if (clk->parent == &usb_clk[0]) {
                reg &= ~CCM_PCDR0_48MDIV_MASK;
                reg |= div << CCM_PCDR0_48MDIV_OFFSET;
        }
        __raw_writel(reg, CCM_PCDR0);

        return 0;
}

static unsigned long _clk_clko_recalc(struct clk *clk)
{
        u32 div = 0;
        unsigned long parent_rate;

        parent_rate = clk_get_rate(clk->parent);

        if (clk->parent == &usb_clk[0]) /* 48M */
                div = __raw_readl(CCM_PCDR0) & CCM_PCDR0_48MDIV_MASK
                         >> CCM_PCDR0_48MDIV_OFFSET;
        div++;

        return parent_rate / div;
}

static struct clk clko_clk;

static int _clk_clko_set_parent(struct clk *clk, struct clk *parent)
{
        u32 reg;

        reg = __raw_readl(CCM_CCSR) & ~CCM_CCSR_CLKOSEL_MASK;

        if (parent == &ckil_clk)
                reg |= 0 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &fpm_clk)
                reg |= 1 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &ckih_clk)
                reg |= 2 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == mpll_clk.parent)
                reg |= 3 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == spll_clk.parent)
                reg |= 4 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &mpll_clk)
                reg |= 5 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &spll_clk)
                reg |= 6 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &fclk_clk)
                reg |= 7 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &hclk_clk)
                reg |= 8 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &ipg_clk)
                reg |= 9 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &per_clk[0])
                reg |= 0xA << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &per_clk[1])
                reg |= 0xB << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &per_clk[2])
                reg |= 0xC << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &per_clk[3])
                reg |= 0xD << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &ssi_clk[0])
                reg |= 0xE << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &ssi_clk[1])
                reg |= 0xF << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &nfc_clk)
                reg |= 0x10 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &usb_clk[0])
                reg |= 0x14 << CCM_CCSR_CLKOSEL_OFFSET;
        else if (parent == &clko_clk)
                reg |= 0x15 << CCM_CCSR_CLKOSEL_OFFSET;
        else
                return -EINVAL;

        __raw_writel(reg, CCM_CCSR);

        return 0;
}

static struct clk clko_clk = {
        .get_rate = _clk_clko_recalc,
        .set_rate = _clk_clko_set_rate,
        .round_rate = _clk_clko_round_rate,
        .set_parent = _clk_clko_set_parent,
};


#define _REGISTER_CLOCK(d, n, c) \
        { \
                .dev_id = d, \
                .con_id = n, \
                .clk = &c, \
        },
static struct clk_lookup lookups[] = {
/* It's unlikely that any driver wants one of them directly:
        _REGISTER_CLOCK(NULL, "ckih", ckih_clk)
        _REGISTER_CLOCK(NULL, "ckil", ckil_clk)
        _REGISTER_CLOCK(NULL, "fpm", fpm_clk)
        _REGISTER_CLOCK(NULL, "mpll", mpll_clk)
        _REGISTER_CLOCK(NULL, "spll", spll_clk)
        _REGISTER_CLOCK(NULL, "fclk", fclk_clk)
        _REGISTER_CLOCK(NULL, "hclk", hclk_clk)
        _REGISTER_CLOCK(NULL, "ipg", ipg_clk)
*/
        _REGISTER_CLOCK(NULL, "perclk1", per_clk[0])
        _REGISTER_CLOCK(NULL, "perclk2", per_clk[1])
        _REGISTER_CLOCK(NULL, "perclk3", per_clk[2])
        _REGISTER_CLOCK(NULL, "perclk4", per_clk[3])
        _REGISTER_CLOCK(NULL, "clko", clko_clk)
        _REGISTER_CLOCK("imx21-uart.0", NULL, uart_clk[0])
        _REGISTER_CLOCK("imx21-uart.1", NULL, uart_clk[1])
        _REGISTER_CLOCK("imx21-uart.2", NULL, uart_clk[2])
        _REGISTER_CLOCK("imx21-uart.3", NULL, uart_clk[3])
        _REGISTER_CLOCK(NULL, "gpt1", gpt_clk[0])
        _REGISTER_CLOCK(NULL, "gpt1", gpt_clk[1])
        _REGISTER_CLOCK(NULL, "gpt1", gpt_clk[2])
        _REGISTER_CLOCK(NULL, "pwm", pwm_clk[0])
        _REGISTER_CLOCK(NULL, "sdhc1", sdhc_clk[0])
        _REGISTER_CLOCK(NULL, "sdhc2", sdhc_clk[1])
        _REGISTER_CLOCK("imx21-cspi.0", NULL, cspi_clk[0])
        _REGISTER_CLOCK("imx21-cspi.1", NULL, cspi_clk[1])
        _REGISTER_CLOCK("imx21-cspi.2", NULL, cspi_clk[2])
        _REGISTER_CLOCK("imx-fb.0", NULL, lcdc_clk[0])
        _REGISTER_CLOCK(NULL, "csi", csi_clk[0])
        _REGISTER_CLOCK("imx21-hcd.0", NULL, usb_clk[0])
        _REGISTER_CLOCK(NULL, "ssi1", ssi_clk[0])
        _REGISTER_CLOCK(NULL, "ssi2", ssi_clk[1])
        _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
        _REGISTER_CLOCK(NULL, "dma", dma_clk[0])
        _REGISTER_CLOCK(NULL, "brom", brom_clk)
        _REGISTER_CLOCK(NULL, "emma", emma_clk[0])
        _REGISTER_CLOCK(NULL, "slcdc", slcdc_clk[0])
        _REGISTER_CLOCK("imx2-wdt.0", NULL, wdog_clk)
        _REGISTER_CLOCK(NULL, "gpio", gpio_clk)
        _REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk)
        _REGISTER_CLOCK("mxc-keypad", NULL, kpp_clk)
        _REGISTER_CLOCK(NULL, "owire", owire_clk)
        _REGISTER_CLOCK(NULL, "rtc", rtc_clk)
};

/*
 * must be called very early to get information about the
 * available clock rate when the timer framework starts
 */
int __init mx21_clocks_init(unsigned long lref, unsigned long href)
{
        u32 cscr;

        external_low_reference = lref;
        external_high_reference = href;

        /* detect clock reference for both system PLL */
        cscr = CSCR();
        if (cscr & CCM_CSCR_MCU)
                mpll_clk.parent = &ckih_clk;
        else
                mpll_clk.parent = &fpm_clk;

        if (cscr & CCM_CSCR_SP)
                spll_clk.parent = &ckih_clk;
        else
                spll_clk.parent = &fpm_clk;

        clkdev_add_table(lookups, ARRAY_SIZE(lookups));

        /* Turn off all clock gates */
        __raw_writel(0, CCM_PCCR0);
        __raw_writel(CCM_PCCR_GPT1_MASK, CCM_PCCR1);

        /* This turns of the serial PLL as well */
        spll_clk.disable(&spll_clk);

        /* This will propagate to all children and init all the clock rates. */
        clk_enable(&per_clk[0]);
        clk_enable(&gpio_clk);

#if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_ICEDCC)
        clk_enable(&uart_clk[0]);
#endif

        mxc_timer_init(&gpt_clk[0], MX21_IO_ADDRESS(MX21_GPT1_BASE_ADDR),
                        MX21_INT_GPT1);
        return 0;
}