i.MX3: introduce clock API

This patch introduces the clock API for for arch-mxc

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 1147 insertions, 0 deletions

diff --git a/arch/arm/mach-mx3/clock.c b/arch/arm/mach-mx3/clock.c
new file mode 100644
index 000000000000..2f3635943e70
--- /dev/null
+++ b/arch/arm/mach-mx3/clock.c
@@ -0,0 +1,1147 @@
+/*
+ * Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
+ *
+ * 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/module.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <asm/arch/clock.h>
+#include <asm/div64.h>
+
+#include "crm_regs.h"
+
+#define PRE_DIV_MIN_FREQ    10000000 /* Minimum Frequency after Predivider */
+
+static void __calc_pre_post_dividers(u32 div, u32 *pre, u32 *post)
+{
+        u32 min_pre, temp_pre, old_err, err;
+
+        if (div >= 512) {
+                *pre = 8;
+                *post = 64;
+        } else if (div >= 64) {
+                min_pre = (div - 1) / 64 + 1;
+                old_err = 8;
+                for (temp_pre = 8; temp_pre >= min_pre; temp_pre--) {
+                        err = div % temp_pre;
+                        if (err == 0) {
+                                *pre = temp_pre;
+                                break;
+                        }
+                        err = temp_pre - err;
+                        if (err < old_err) {
+                                old_err = err;
+                                *pre = temp_pre;
+                        }
+                }
+                *post = (div + *pre - 1) / *pre;
+        } else if (div <= 8) {
+                *pre = div;
+                *post = 1;
+        } else {
+                *pre = 1;
+                *post = div;
+        }
+}
+
+static struct clk mcu_pll_clk;
+static struct clk mcu_main_clk;
+static struct clk usb_pll_clk;
+static struct clk serial_pll_clk;
+static struct clk ipg_clk;
+static struct clk ckih_clk;
+static struct clk ahb_clk;
+
+static int _clk_enable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(clk->enable_reg);
+        reg |= 3 << 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 &= ~(3 << clk->enable_shift);
+        __raw_writel(reg, clk->enable_reg);
+}
+
+static void _clk_emi_disable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(clk->enable_reg);
+        reg &= ~(3 << clk->enable_shift);
+        reg |= (1 << clk->enable_shift);
+        __raw_writel(reg, clk->enable_reg);
+}
+
+static int _clk_pll_set_rate(struct clk *clk, unsigned long rate)
+{
+        u32 reg;
+        signed long pd = 1;     /* Pre-divider */
+        signed long mfi;        /* Multiplication Factor (Integer part) */
+        signed long mfn;        /* Multiplication Factor (Integer part) */
+        signed long mfd;        /* Multiplication Factor (Denominator Part) */
+        signed long tmp;
+        u32 ref_freq = clk_get_rate(clk->parent);
+
+        while (((ref_freq / pd) * 10) > rate)
+                pd++;
+
+        if ((ref_freq / pd) < PRE_DIV_MIN_FREQ)
+                return -EINVAL;
+
+        /* the ref_freq/2 in the following is to round up */
+        mfi = (((rate / 2) * pd) + (ref_freq / 2)) / ref_freq;
+        if (mfi < 5 || mfi > 15)
+                return -EINVAL;
+
+        /* pick a mfd value that will work
+         * then solve for mfn */
+        mfd = ref_freq / 50000;
+
+        /*
+         *          pll_freq * pd * mfd
+         *   mfn = --------------------  -  (mfi * mfd)
+         *           2 * ref_freq
+         */
+        /* the tmp/2 is for rounding */
+        tmp = ref_freq / 10000;
+        mfn =
+            ((((((rate / 2) + (tmp / 2)) / tmp) * pd) * mfd) / 10000) -
+            (mfi * mfd);
+
+        mfn = mfn & 0x3ff;
+        pd--;
+        mfd--;
+
+        /* Change the Pll value */
+        reg = (mfi << MXC_CCM_PCTL_MFI_OFFSET) |
+            (mfn << MXC_CCM_PCTL_MFN_OFFSET) |
+            (mfd << MXC_CCM_PCTL_MFD_OFFSET) | (pd << MXC_CCM_PCTL_PD_OFFSET);
+
+        if (clk == &mcu_pll_clk)
+                __raw_writel(reg, MXC_CCM_MPCTL);
+        else if (clk == &usb_pll_clk)
+                __raw_writel(reg, MXC_CCM_UPCTL);
+        else if (clk == &serial_pll_clk)
+                __raw_writel(reg, MXC_CCM_SRPCTL);
+
+        return 0;
+}
+
+static unsigned long _clk_pll_get_rate(struct clk *clk)
+{
+        long mfi, mfn, mfd, pdf, ref_clk, mfn_abs;
+        unsigned long reg, ccmr;
+        s64 temp;
+        unsigned int prcs;
+
+        ccmr = __raw_readl(MXC_CCM_CCMR);
+        prcs = (ccmr & MXC_CCM_CCMR_PRCS_MASK) >> MXC_CCM_CCMR_PRCS_OFFSET;
+        if (prcs == 0x1)
+                ref_clk = CKIL_CLK_FREQ * 1024;
+        else
+                ref_clk = clk_get_rate(&ckih_clk);
+
+        if (clk == &mcu_pll_clk) {
+                if ((ccmr & MXC_CCM_CCMR_MPE) == 0)
+                        return ref_clk;
+                if ((ccmr & MXC_CCM_CCMR_MDS) != 0)
+                        return ref_clk;
+                reg = __raw_readl(MXC_CCM_MPCTL);
+        } else if (clk == &usb_pll_clk)
+                reg = __raw_readl(MXC_CCM_UPCTL);
+        else if (clk == &serial_pll_clk)
+                reg = __raw_readl(MXC_CCM_SRPCTL);
+        else {
+                BUG();
+                return 0;
+        }
+
+        pdf = (reg & MXC_CCM_PCTL_PD_MASK) >> MXC_CCM_PCTL_PD_OFFSET;
+        mfd = (reg & MXC_CCM_PCTL_MFD_MASK) >> MXC_CCM_PCTL_MFD_OFFSET;
+        mfi = (reg & MXC_CCM_PCTL_MFI_MASK) >> MXC_CCM_PCTL_MFI_OFFSET;
+        mfi = (mfi <= 5) ? 5 : mfi;
+        mfn = mfn_abs = reg & MXC_CCM_PCTL_MFN_MASK;
+
+        if (mfn >= 0x200) {
+                mfn |= 0xFFFFFE00;
+                mfn_abs = -mfn;
+        }
+
+        ref_clk *= 2;
+        ref_clk /= pdf + 1;
+
+        temp = (u64) ref_clk * mfn_abs;
+        do_div(temp, mfd + 1);
+        if (mfn < 0)
+                temp = -temp;
+        temp = (ref_clk * mfi) + temp;
+
+        return temp;
+}
+
+static int _clk_usb_pll_enable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(MXC_CCM_CCMR);
+        reg |= MXC_CCM_CCMR_UPE;
+        __raw_writel(reg, MXC_CCM_CCMR);
+
+        /* No lock bit on MX31, so using max time from spec */
+        udelay(80);
+
+        return 0;
+}
+
+static void _clk_usb_pll_disable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(MXC_CCM_CCMR);
+        reg &= ~MXC_CCM_CCMR_UPE;
+        __raw_writel(reg, MXC_CCM_CCMR);
+}
+
+static int _clk_serial_pll_enable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(MXC_CCM_CCMR);
+        reg |= MXC_CCM_CCMR_SPE;
+        __raw_writel(reg, MXC_CCM_CCMR);
+
+        /* No lock bit on MX31, so using max time from spec */
+        udelay(80);
+
+        return 0;
+}
+
+static void _clk_serial_pll_disable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(MXC_CCM_CCMR);
+        reg &= ~MXC_CCM_CCMR_SPE;
+        __raw_writel(reg, MXC_CCM_CCMR);
+}
+
+#define PDR0(mask, off) ((__raw_readl(MXC_CCM_PDR0) & mask) >> off)
+#define PDR1(mask, off) ((__raw_readl(MXC_CCM_PDR1) & mask) >> off)
+#define PDR2(mask, off) ((__raw_readl(MXC_CCM_PDR2) & mask) >> off)
+
+static unsigned long _clk_mcu_main_get_rate(struct clk *clk)
+{
+        u32 pmcr0 = __raw_readl(MXC_CCM_PMCR0);
+
+        if ((pmcr0 & MXC_CCM_PMCR0_DFSUP1) == MXC_CCM_PMCR0_DFSUP1_SPLL)
+                return clk_get_rate(&serial_pll_clk);
+        else
+                return clk_get_rate(&mcu_pll_clk);
+}
+
+static unsigned long _clk_hclk_get_rate(struct clk *clk)
+{
+        unsigned long max_pdf;
+
+        max_pdf = PDR0(MXC_CCM_PDR0_MAX_PODF_MASK,
+                       MXC_CCM_PDR0_MAX_PODF_OFFSET);
+        return clk_get_rate(clk->parent) / (max_pdf + 1);
+}
+
+static unsigned long _clk_ipg_get_rate(struct clk *clk)
+{
+        unsigned long ipg_pdf;
+
+        ipg_pdf = PDR0(MXC_CCM_PDR0_IPG_PODF_MASK,
+                       MXC_CCM_PDR0_IPG_PODF_OFFSET);
+        return clk_get_rate(clk->parent) / (ipg_pdf + 1);
+}
+
+static unsigned long _clk_nfc_get_rate(struct clk *clk)
+{
+        unsigned long nfc_pdf;
+
+        nfc_pdf = PDR0(MXC_CCM_PDR0_NFC_PODF_MASK,
+                       MXC_CCM_PDR0_NFC_PODF_OFFSET);
+        return clk_get_rate(clk->parent) / (nfc_pdf + 1);
+}
+
+static unsigned long _clk_hsp_get_rate(struct clk *clk)
+{
+        unsigned long hsp_pdf;
+
+        hsp_pdf = PDR0(MXC_CCM_PDR0_HSP_PODF_MASK,
+                       MXC_CCM_PDR0_HSP_PODF_OFFSET);
+        return clk_get_rate(clk->parent) / (hsp_pdf + 1);
+}
+
+static unsigned long _clk_usb_get_rate(struct clk *clk)
+{
+        unsigned long usb_pdf, usb_prepdf;
+
+        usb_pdf = PDR1(MXC_CCM_PDR1_USB_PODF_MASK,
+                       MXC_CCM_PDR1_USB_PODF_OFFSET);
+        usb_prepdf = PDR1(MXC_CCM_PDR1_USB_PRDF_MASK,
+                          MXC_CCM_PDR1_USB_PRDF_OFFSET);
+        return clk_get_rate(clk->parent) / (usb_prepdf + 1) / (usb_pdf + 1);
+}
+
+static unsigned long _clk_csi_get_rate(struct clk *clk)
+{
+        u32 reg, pre, post;
+
+        reg = __raw_readl(MXC_CCM_PDR0);
+        pre = (reg & MXC_CCM_PDR0_CSI_PRDF_MASK) >>
+            MXC_CCM_PDR0_CSI_PRDF_OFFSET;
+        pre++;
+        post = (reg & MXC_CCM_PDR0_CSI_PODF_MASK) >>
+            MXC_CCM_PDR0_CSI_PODF_OFFSET;
+        post++;
+        return clk_get_rate(clk->parent) / (pre * post);
+}
+
+static unsigned long _clk_csi_round_rate(struct clk *clk, unsigned long rate)
+{
+        u32 pre, post, parent = clk_get_rate(clk->parent);
+        u32 div = parent / rate;
+
+        if (parent % rate)
+                div++;
+
+        __calc_pre_post_dividers(div, &pre, &post);
+
+        return parent / (pre * post);
+}
+
+static int _clk_csi_set_rate(struct clk *clk, unsigned long rate)
+{
+        u32 reg, div, pre, post, parent = clk_get_rate(clk->parent);
+
+        div = parent / rate;
+
+        if ((parent / div) != rate)
+                return -EINVAL;
+
+        __calc_pre_post_dividers(div, &pre, &post);
+
+        /* Set CSI clock divider */
+        reg = __raw_readl(MXC_CCM_PDR0) &
+            ~(MXC_CCM_PDR0_CSI_PODF_MASK | MXC_CCM_PDR0_CSI_PRDF_MASK);
+        reg |= (post - 1) << MXC_CCM_PDR0_CSI_PODF_OFFSET;
+        reg |= (pre - 1) << MXC_CCM_PDR0_CSI_PRDF_OFFSET;
+        __raw_writel(reg, MXC_CCM_PDR0);
+
+        return 0;
+}
+
+static unsigned long _clk_per_get_rate(struct clk *clk)
+{
+        unsigned long per_pdf;
+
+        per_pdf = PDR0(MXC_CCM_PDR0_PER_PODF_MASK,
+                       MXC_CCM_PDR0_PER_PODF_OFFSET);
+        return clk_get_rate(clk->parent) / (per_pdf + 1);
+}
+
+static unsigned long _clk_ssi1_get_rate(struct clk *clk)
+{
+        unsigned long ssi1_pdf, ssi1_prepdf;
+
+        ssi1_pdf = PDR1(MXC_CCM_PDR1_SSI1_PODF_MASK,
+                        MXC_CCM_PDR1_SSI1_PODF_OFFSET);
+        ssi1_prepdf = PDR1(MXC_CCM_PDR1_SSI1_PRE_PODF_MASK,
+                           MXC_CCM_PDR1_SSI1_PRE_PODF_OFFSET);
+        return clk_get_rate(clk->parent) / (ssi1_prepdf + 1) / (ssi1_pdf + 1);
+}
+
+static unsigned long _clk_ssi2_get_rate(struct clk *clk)
+{
+        unsigned long ssi2_pdf, ssi2_prepdf;
+
+        ssi2_pdf = PDR1(MXC_CCM_PDR1_SSI2_PODF_MASK,
+                        MXC_CCM_PDR1_SSI2_PODF_OFFSET);
+        ssi2_prepdf = PDR1(MXC_CCM_PDR1_SSI2_PRE_PODF_MASK,
+                           MXC_CCM_PDR1_SSI2_PRE_PODF_OFFSET);
+        return clk_get_rate(clk->parent) / (ssi2_prepdf + 1) / (ssi2_pdf + 1);
+}
+
+static unsigned long _clk_firi_get_rate(struct clk *clk)
+{
+        unsigned long firi_pdf, firi_prepdf;
+
+        firi_pdf = PDR1(MXC_CCM_PDR1_FIRI_PODF_MASK,
+                        MXC_CCM_PDR1_FIRI_PODF_OFFSET);
+        firi_prepdf = PDR1(MXC_CCM_PDR1_FIRI_PRE_PODF_MASK,
+                           MXC_CCM_PDR1_FIRI_PRE_PODF_OFFSET);
+        return clk_get_rate(clk->parent) / (firi_prepdf + 1) / (firi_pdf + 1);
+}
+
+static unsigned long _clk_firi_round_rate(struct clk *clk, unsigned long rate)
+{
+        u32 pre, post;
+        u32 parent = clk_get_rate(clk->parent);
+        u32 div = parent / rate;
+
+        if (parent % rate)
+                div++;
+
+        __calc_pre_post_dividers(div, &pre, &post);
+
+        return parent / (pre * post);
+
+}
+
+static int _clk_firi_set_rate(struct clk *clk, unsigned long rate)
+{
+        u32 reg, div, pre, post, parent = clk_get_rate(clk->parent);
+
+        div = parent / rate;
+
+        if ((parent / div) != rate)
+                return -EINVAL;
+
+        __calc_pre_post_dividers(div, &pre, &post);
+
+        /* Set FIRI clock divider */
+        reg = __raw_readl(MXC_CCM_PDR1) &
+            ~(MXC_CCM_PDR1_FIRI_PODF_MASK | MXC_CCM_PDR1_FIRI_PRE_PODF_MASK);
+        reg |= (pre - 1) << MXC_CCM_PDR1_FIRI_PRE_PODF_OFFSET;
+        reg |= (post - 1) << MXC_CCM_PDR1_FIRI_PODF_OFFSET;
+        __raw_writel(reg, MXC_CCM_PDR1);
+
+        return 0;
+}
+
+static unsigned long _clk_mbx_get_rate(struct clk *clk)
+{
+        return clk_get_rate(clk->parent) / 2;
+}
+
+static unsigned long _clk_mstick1_get_rate(struct clk *clk)
+{
+        unsigned long msti_pdf;
+
+        msti_pdf = PDR2(MXC_CCM_PDR2_MST1_PDF_MASK,
+                        MXC_CCM_PDR2_MST1_PDF_OFFSET);
+        return clk_get_rate(clk->parent) / (msti_pdf + 1);
+}
+
+static unsigned long _clk_mstick2_get_rate(struct clk *clk)
+{
+        unsigned long msti_pdf;
+
+        msti_pdf = PDR2(MXC_CCM_PDR2_MST2_PDF_MASK,
+                        MXC_CCM_PDR2_MST2_PDF_OFFSET);
+        return clk_get_rate(clk->parent) / (msti_pdf + 1);
+}
+
+static unsigned long ckih_rate;
+
+static unsigned long clk_ckih_get_rate(struct clk *clk)
+{
+        return ckih_rate;
+}
+
+static struct clk ckih_clk = {
+        .name = "ckih",
+        .get_rate = clk_ckih_get_rate,
+};
+
+static unsigned long clk_ckil_get_rate(struct clk *clk)
+{
+        return CKIL_CLK_FREQ;
+}
+
+static struct clk ckil_clk = {
+        .name = "ckil",
+        .get_rate = clk_ckil_get_rate,
+};
+
+static struct clk mcu_pll_clk = {
+        .name = "mcu_pll",
+        .parent = &ckih_clk,
+        .set_rate = _clk_pll_set_rate,
+        .get_rate = _clk_pll_get_rate,
+};
+
+static struct clk mcu_main_clk = {
+        .name = "mcu_main_clk",
+        .parent = &mcu_pll_clk,
+        .get_rate = _clk_mcu_main_get_rate,
+};
+
+static struct clk serial_pll_clk = {
+        .name = "serial_pll",
+        .parent = &ckih_clk,
+        .set_rate = _clk_pll_set_rate,
+        .get_rate = _clk_pll_get_rate,
+        .enable = _clk_serial_pll_enable,
+        .disable = _clk_serial_pll_disable,
+};
+
+static struct clk usb_pll_clk = {
+        .name = "usb_pll",
+        .parent = &ckih_clk,
+        .set_rate = _clk_pll_set_rate,
+        .get_rate = _clk_pll_get_rate,
+        .enable = _clk_usb_pll_enable,
+        .disable = _clk_usb_pll_disable,
+};
+
+static struct clk ahb_clk = {
+        .name = "ahb_clk",
+        .parent = &mcu_main_clk,
+        .get_rate = _clk_hclk_get_rate,
+};
+
+static struct clk per_clk = {
+        .name = "per_clk",
+        .parent = &usb_pll_clk,
+        .get_rate = _clk_per_get_rate,
+};
+
+static struct clk perclk_clk = {
+        .name = "perclk_clk",
+        .parent = &ipg_clk,
+};
+
+static struct clk cspi_clk[] = {
+        {
+         .name = "cspi_clk",
+         .id = 0,
+         .parent = &ipg_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR2,
+         .enable_shift = MXC_CCM_CGR2_CSPI1_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "cspi_clk",
+         .id = 1,
+         .parent = &ipg_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR2,
+         .enable_shift = MXC_CCM_CGR2_CSPI2_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "cspi_clk",
+         .id = 2,
+         .parent = &ipg_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_CSPI3_OFFSET,
+         .disable = _clk_disable,},
+};
+
+static struct clk ipg_clk = {
+        .name = "ipg_clk",
+        .parent = &ahb_clk,
+        .get_rate = _clk_ipg_get_rate,
+};
+
+static struct clk emi_clk = {
+        .name = "emi_clk",
+        .parent = &ahb_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR2,
+        .enable_shift = MXC_CCM_CGR2_EMI_OFFSET,
+        .disable = _clk_emi_disable,
+};
+
+static struct clk gpt_clk = {
+        .name = "gpt_clk",
+        .parent = &perclk_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR0,
+        .enable_shift = MXC_CCM_CGR0_GPT_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk pwm_clk = {
+        .name = "pwm_clk",
+        .parent = &perclk_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR0,
+        .enable_shift = MXC_CCM_CGR1_PWM_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk epit_clk[] = {
+        {
+         .name = "epit_clk",
+         .id = 0,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_EPIT1_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "epit_clk",
+         .id = 1,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_EPIT2_OFFSET,
+         .disable = _clk_disable,},
+};
+
+static struct clk nfc_clk = {
+        .name = "nfc_clk",
+        .parent = &ahb_clk,
+        .get_rate = _clk_nfc_get_rate,
+};
+
+static struct clk scc_clk = {
+        .name = "scc_clk",
+        .parent = &ipg_clk,
+};
+
+static struct clk ipu_clk = {
+        .name = "ipu_clk",
+        .parent = &mcu_main_clk,
+        .get_rate = _clk_hsp_get_rate,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR1,
+        .enable_shift = MXC_CCM_CGR1_IPU_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk kpp_clk = {
+        .name = "kpp_clk",
+        .parent = &ipg_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR1,
+        .enable_shift = MXC_CCM_CGR1_KPP_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk wdog_clk = {
+        .name = "wdog_clk",
+        .parent = &ipg_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR1,
+        .enable_shift = MXC_CCM_CGR1_WDOG_OFFSET,
+        .disable = _clk_disable,
+};
+static struct clk rtc_clk = {
+        .name = "rtc_clk",
+        .parent = &ipg_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR1,
+        .enable_shift = MXC_CCM_CGR1_RTC_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk usb_clk[] = {
+        {
+         .name = "usb_clk",
+         .parent = &usb_pll_clk,
+         .get_rate = _clk_usb_get_rate,},
+        {
+         .name = "usb_ahb_clk",
+         .parent = &ahb_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR1,
+         .enable_shift = MXC_CCM_CGR1_USBOTG_OFFSET,
+         .disable = _clk_disable,},
+};
+
+static struct clk csi_clk = {
+        .name = "csi_clk",
+        .parent = &serial_pll_clk,
+        .get_rate = _clk_csi_get_rate,
+        .round_rate = _clk_csi_round_rate,
+        .set_rate = _clk_csi_set_rate,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR1,
+        .enable_shift = MXC_CCM_CGR1_CSI_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk uart_clk[] = {
+        {
+         .name = "uart_clk",
+         .id = 0,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_UART1_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "uart_clk",
+         .id = 1,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_UART2_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "uart_clk",
+         .id = 2,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR1,
+         .enable_shift = MXC_CCM_CGR1_UART3_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "uart_clk",
+         .id = 3,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR1,
+         .enable_shift = MXC_CCM_CGR1_UART4_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "uart_clk",
+         .id = 4,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR1,
+         .enable_shift = MXC_CCM_CGR1_UART5_OFFSET,
+         .disable = _clk_disable,},
+};
+
+static struct clk i2c_clk[] = {
+        {
+         .name = "i2c_clk",
+         .id = 0,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_I2C1_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "i2c_clk",
+         .id = 1,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_I2C2_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "i2c_clk",
+         .id = 2,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_I2C3_OFFSET,
+         .disable = _clk_disable,},
+};
+
+static struct clk owire_clk = {
+        .name = "owire_clk",
+        .parent = &perclk_clk,
+        .enable_reg = MXC_CCM_CGR1,
+        .enable_shift = MXC_CCM_CGR1_OWIRE_OFFSET,
+        .enable = _clk_enable,
+        .disable = _clk_disable,
+};
+
+static struct clk sdhc_clk[] = {
+        {
+         .name = "sdhc_clk",
+         .id = 0,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_SD_MMC1_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "sdhc_clk",
+         .id = 1,
+         .parent = &perclk_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_SD_MMC2_OFFSET,
+         .disable = _clk_disable,},
+};
+
+static struct clk ssi_clk[] = {
+        {
+         .name = "ssi_clk",
+         .parent = &serial_pll_clk,
+         .get_rate = _clk_ssi1_get_rate,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_SSI1_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "ssi_clk",
+         .id = 1,
+         .parent = &serial_pll_clk,
+         .get_rate = _clk_ssi2_get_rate,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR2,
+         .enable_shift = MXC_CCM_CGR2_SSI2_OFFSET,
+         .disable = _clk_disable,},
+};
+
+static struct clk firi_clk = {
+        .name = "firi_clk",
+        .parent = &usb_pll_clk,
+        .round_rate = _clk_firi_round_rate,
+        .set_rate = _clk_firi_set_rate,
+        .get_rate = _clk_firi_get_rate,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR2,
+        .enable_shift = MXC_CCM_CGR2_FIRI_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk ata_clk = {
+        .name = "ata_clk",
+        .parent = &ipg_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR0,
+        .enable_shift = MXC_CCM_CGR0_ATA_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk mbx_clk = {
+        .name = "mbx_clk",
+        .parent = &ahb_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR2,
+        .enable_shift = MXC_CCM_CGR2_GACC_OFFSET,
+        .get_rate = _clk_mbx_get_rate,
+};
+
+static struct clk vpu_clk = {
+        .name = "vpu_clk",
+        .parent = &ahb_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR2,
+        .enable_shift = MXC_CCM_CGR2_GACC_OFFSET,
+        .get_rate = _clk_mbx_get_rate,
+};
+
+static struct clk rtic_clk = {
+        .name = "rtic_clk",
+        .parent = &ahb_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR2,
+        .enable_shift = MXC_CCM_CGR2_RTIC_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk rng_clk = {
+        .name = "rng_clk",
+        .parent = &ipg_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR0,
+        .enable_shift = MXC_CCM_CGR0_RNG_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk sdma_clk[] = {
+        {
+         .name = "sdma_ahb_clk",
+         .parent = &ahb_clk,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR0,
+         .enable_shift = MXC_CCM_CGR0_SDMA_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "sdma_ipg_clk",
+         .parent = &ipg_clk,}
+};
+
+static struct clk mpeg4_clk = {
+        .name = "mpeg4_clk",
+        .parent = &ahb_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR1,
+        .enable_shift = MXC_CCM_CGR1_HANTRO_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk vl2cc_clk = {
+        .name = "vl2cc_clk",
+        .parent = &ahb_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR1,
+        .enable_shift = MXC_CCM_CGR1_HANTRO_OFFSET,
+        .disable = _clk_disable,
+};
+
+static struct clk mstick_clk[] = {
+        {
+         .name = "mstick_clk",
+         .id = 0,
+         .parent = &usb_pll_clk,
+         .get_rate = _clk_mstick1_get_rate,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR1,
+         .enable_shift = MXC_CCM_CGR1_MEMSTICK1_OFFSET,
+         .disable = _clk_disable,},
+        {
+         .name = "mstick_clk",
+         .id = 1,
+         .parent = &usb_pll_clk,
+         .get_rate = _clk_mstick2_get_rate,
+         .enable = _clk_enable,
+         .enable_reg = MXC_CCM_CGR1,
+         .enable_shift = MXC_CCM_CGR1_MEMSTICK2_OFFSET,
+         .disable = _clk_disable,},
+};
+
+static struct clk iim_clk = {
+        .name = "iim_clk",
+        .parent = &ipg_clk,
+        .enable = _clk_enable,
+        .enable_reg = MXC_CCM_CGR0,
+        .enable_shift = MXC_CCM_CGR0_IIM_OFFSET,
+        .disable = _clk_disable,
+};
+
+static unsigned long _clk_cko1_round_rate(struct clk *clk, unsigned long rate)
+{
+        u32 div, parent = clk_get_rate(clk->parent);
+
+        div = parent / rate;
+        if (parent % rate)
+                div++;
+
+        if (div > 8)
+                div = 16;
+        else if (div > 4)
+                div = 8;
+        else if (div > 2)
+                div = 4;
+
+        return parent / div;
+}
+
+static int _clk_cko1_set_rate(struct clk *clk, unsigned long rate)
+{
+        u32 reg, div, parent = clk_get_rate(clk->parent);
+
+        div = parent / rate;
+
+        if (div == 16)
+                div = 4;
+        else if (div == 8)
+                div = 3;
+        else if (div == 4)
+                div = 2;
+        else if (div == 2)
+                div = 1;
+        else if (div == 1)
+                div = 0;
+        else
+                return -EINVAL;
+
+        reg = __raw_readl(MXC_CCM_COSR) & ~MXC_CCM_COSR_CLKOUTDIV_MASK;
+        reg |= div << MXC_CCM_COSR_CLKOUTDIV_OFFSET;
+        __raw_writel(reg, MXC_CCM_COSR);
+
+        return 0;
+}
+
+static unsigned long _clk_cko1_get_rate(struct clk *clk)
+{
+        u32 div;
+
+        div = __raw_readl(MXC_CCM_COSR) & MXC_CCM_COSR_CLKOUTDIV_MASK >>
+            MXC_CCM_COSR_CLKOUTDIV_OFFSET;
+
+        return clk_get_rate(clk->parent) / (1 << div);
+}
+
+static int _clk_cko1_set_parent(struct clk *clk, struct clk *parent)
+{
+        u32 reg;
+
+        reg = __raw_readl(MXC_CCM_COSR) & ~MXC_CCM_COSR_CLKOSEL_MASK;
+
+        if (parent == &mcu_main_clk)
+                reg |= 0 << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &ipg_clk)
+                reg |= 1 << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &usb_pll_clk)
+                reg |= 2 << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == mcu_main_clk.parent)
+                reg |= 3 << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &ahb_clk)
+                reg |= 5 << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &serial_pll_clk)
+                reg |= 7 << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &ckih_clk)
+                reg |= 8 << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &emi_clk)
+                reg |= 9 << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &ipu_clk)
+                reg |= 0xA << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &nfc_clk)
+                reg |= 0xB << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else if (parent == &uart_clk[0])
+                reg |= 0xC << MXC_CCM_COSR_CLKOSEL_OFFSET;
+        else
+                return -EINVAL;
+
+        __raw_writel(reg, MXC_CCM_COSR);
+
+        return 0;
+}
+
+static int _clk_cko1_enable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(MXC_CCM_COSR) | MXC_CCM_COSR_CLKOEN;
+        __raw_writel(reg, MXC_CCM_COSR);
+
+        return 0;
+}
+
+static void _clk_cko1_disable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(MXC_CCM_COSR) & ~MXC_CCM_COSR_CLKOEN;
+        __raw_writel(reg, MXC_CCM_COSR);
+}
+
+static struct clk cko1_clk = {
+        .name = "cko1_clk",
+        .get_rate = _clk_cko1_get_rate,
+        .set_rate = _clk_cko1_set_rate,
+        .round_rate = _clk_cko1_round_rate,
+        .set_parent = _clk_cko1_set_parent,
+        .enable = _clk_cko1_enable,
+        .disable = _clk_cko1_disable,
+};
+
+static struct clk *mxc_clks[] = {
+        &ckih_clk,
+        &ckil_clk,
+        &mcu_pll_clk,
+        &usb_pll_clk,
+        &serial_pll_clk,
+        &mcu_main_clk,
+        &ahb_clk,
+        &per_clk,
+        &perclk_clk,
+        &cko1_clk,
+        &emi_clk,
+        &cspi_clk[0],
+        &cspi_clk[1],
+        &cspi_clk[2],
+        &ipg_clk,
+        &gpt_clk,
+        &pwm_clk,
+        &wdog_clk,
+        &rtc_clk,
+        &epit_clk[0],
+        &epit_clk[1],
+        &nfc_clk,
+        &ipu_clk,
+        &kpp_clk,
+        &usb_clk[0],
+        &usb_clk[1],
+        &csi_clk,
+        &uart_clk[0],
+        &uart_clk[1],
+        &uart_clk[2],
+        &uart_clk[3],
+        &uart_clk[4],
+        &i2c_clk[0],
+        &i2c_clk[1],
+        &i2c_clk[2],
+        &owire_clk,
+        &sdhc_clk[0],
+        &sdhc_clk[1],
+        &ssi_clk[0],
+        &ssi_clk[1],
+        &firi_clk,
+        &ata_clk,
+        &rtic_clk,
+        &rng_clk,
+        &sdma_clk[0],
+        &sdma_clk[1],
+        &mstick_clk[0],
+        &mstick_clk[1],
+        &scc_clk,
+        &iim_clk,
+};
+
+int __init mxc_clocks_init(unsigned long fref)
+{
+        u32 reg;
+        struct clk **clkp;
+
+        ckih_rate = fref;
+
+        for (clkp = mxc_clks; clkp < mxc_clks + ARRAY_SIZE(mxc_clks); clkp++)
+                clk_register(*clkp);
+
+        if (cpu_is_mx31()) {
+                clk_register(&mpeg4_clk);
+                clk_register(&mbx_clk);
+        } else {
+                clk_register(&vpu_clk);
+                clk_register(&vl2cc_clk);
+        }
+
+        /* Turn off all possible clocks */
+        __raw_writel(MXC_CCM_CGR0_GPT_MASK, MXC_CCM_CGR0);
+        __raw_writel(0, MXC_CCM_CGR1);
+
+        __raw_writel(MXC_CCM_CGR2_EMI_MASK |
+                     MXC_CCM_CGR2_IPMUX1_MASK |
+                     MXC_CCM_CGR2_IPMUX2_MASK |
+                     MXC_CCM_CGR2_MXCCLKENSEL_MASK |    /* for MX32 */
+                     MXC_CCM_CGR2_CHIKCAMPEN_MASK |     /* for MX32 */
+                     MXC_CCM_CGR2_OVRVPUBUSY_MASK |     /* for MX32 */
+                     1 << 27 | 1 << 28, /* Bit 27 and 28 are not defined for
+                                           MX32, but still required to be set */
+                     MXC_CCM_CGR2);
+
+        clk_disable(&cko1_clk);
+        clk_disable(&usb_pll_clk);
+
+        pr_info("Clock input source is %ld\n", clk_get_rate(&ckih_clk));
+
+        clk_enable(&gpt_clk);
+        clk_enable(&emi_clk);
+        clk_enable(&iim_clk);
+
+        clk_enable(&serial_pll_clk);
+
+        if (mx31_revision() >= CHIP_REV_2_0) {
+                reg = __raw_readl(MXC_CCM_PMCR1);
+                /* No PLL restart on DVFS switch; enable auto EMI handshake */
+                reg |= MXC_CCM_PMCR1_PLLRDIS | MXC_CCM_PMCR1_EMIRQ_EN;
+                __raw_writel(reg, MXC_CCM_PMCR1);
+        }
+
+        return 0;
+}
+