ARM: imx: Add core definitions for MX53

Add iomux, clocks,  and memory map for Freescale's MX53 SoC.
Add cpu_is_mx53 function to common.h.
Add 3 more banks of gpio's to mxc_gpio_ports.
Add MX53 phys offset address.

Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 1189 insertions, 0 deletions

diff --git a/arch/arm/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
new file mode 100644
index 000000000000..ca4f9d58cfeb
--- /dev/null
+++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
@@ -0,0 +1,1189 @@
+/*
+ * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria@canonical.com>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <asm/clkdev.h>
+#include <asm/div64.h>
+
+#include <mach/hardware.h>
+#include <mach/common.h>
+#include <mach/clock.h>
+
+#include "crm_regs.h"
+
+/* External clock values passed-in by the board code */
+static unsigned long external_high_reference, external_low_reference;
+static unsigned long oscillator_reference, ckih2_reference;
+
+static struct clk osc_clk;
+static struct clk pll1_main_clk;
+static struct clk pll1_sw_clk;
+static struct clk pll2_sw_clk;
+static struct clk pll3_sw_clk;
+static struct clk mx53_pll4_sw_clk;
+static struct clk lp_apm_clk;
+static struct clk periph_apm_clk;
+static struct clk ahb_clk;
+static struct clk ipg_clk;
+static struct clk usboh3_clk;
+
+#define MAX_DPLL_WAIT_TRIES	1000 /* 1000 * udelay(1) = 1ms */
+
+/* calculate best pre and post dividers to get the required divider */
+static void __calc_pre_post_dividers(u32 div, u32 *pre, u32 *post,
+	u32 max_pre, u32 max_post)
+{
+	if (div >= max_pre * max_post) {
+		*pre = max_pre;
+		*post = max_post;
+	} else if (div >= max_pre) {
+		u32 min_pre, temp_pre, old_err, err;
+		min_pre = DIV_ROUND_UP(div, max_post);
+		old_err = max_pre;
+		for (temp_pre = max_pre; 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_ROUND_UP(div, *pre);
+	} else {
+		*pre = div;
+		*post = 1;
+	}
+}
+
+static void _clk_ccgr_setclk(struct clk *clk, unsigned mode)
+{
+	u32 reg = __raw_readl(clk->enable_reg);
+
+	reg &= ~(MXC_CCM_CCGRx_CG_MASK << clk->enable_shift);
+	reg |= mode << clk->enable_shift;
+
+	__raw_writel(reg, clk->enable_reg);
+}
+
+static int _clk_ccgr_enable(struct clk *clk)
+{
+	_clk_ccgr_setclk(clk, MXC_CCM_CCGRx_MOD_ON);
+	return 0;
+}
+
+static void _clk_ccgr_disable(struct clk *clk)
+{
+	_clk_ccgr_setclk(clk, MXC_CCM_CCGRx_MOD_OFF);
+}
+
+static int _clk_ccgr_enable_inrun(struct clk *clk)
+{
+	_clk_ccgr_setclk(clk, MXC_CCM_CCGRx_MOD_IDLE);
+	return 0;
+}
+
+static void _clk_ccgr_disable_inwait(struct clk *clk)
+{
+	_clk_ccgr_setclk(clk, MXC_CCM_CCGRx_MOD_IDLE);
+}
+
+/*
+ * For the 4-to-1 muxed input clock
+ */
+static inline u32 _get_mux(struct clk *parent, struct clk *m0,
+			   struct clk *m1, struct clk *m2, struct clk *m3)
+{
+	if (parent == m0)
+		return 0;
+	else if (parent == m1)
+		return 1;
+	else if (parent == m2)
+		return 2;
+	else if (parent == m3)
+		return 3;
+	else
+		BUG();
+
+	return -EINVAL;
+}
+
+static inline void __iomem *_get_pll_base(struct clk *pll)
+{
+	if (pll == &pll1_main_clk)
+		return MX51_DPLL1_BASE;
+	else if (pll == &pll2_sw_clk)
+		return MX51_DPLL2_BASE;
+	else if (pll == &pll3_sw_clk)
+		return MX51_DPLL3_BASE;
+	else if (pll == &mx53_pll4_sw_clk)
+		return MX53_DPLL4_BASE;
+	else
+		BUG();
+
+	return NULL;
+}
+
+static unsigned long clk_pll_get_rate(struct clk *clk)
+{
+	long mfi, mfn, mfd, pdf, ref_clk, mfn_abs;
+	unsigned long dp_op, dp_mfd, dp_mfn, dp_ctl, pll_hfsm, dbl;
+	void __iomem *pllbase;
+	s64 temp;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	pllbase = _get_pll_base(clk);
+
+	dp_ctl = __raw_readl(pllbase + MXC_PLL_DP_CTL);
+	pll_hfsm = dp_ctl & MXC_PLL_DP_CTL_HFSM;
+	dbl = dp_ctl & MXC_PLL_DP_CTL_DPDCK0_2_EN;
+
+	if (pll_hfsm == 0) {
+		dp_op = __raw_readl(pllbase + MXC_PLL_DP_OP);
+		dp_mfd = __raw_readl(pllbase + MXC_PLL_DP_MFD);
+		dp_mfn = __raw_readl(pllbase + MXC_PLL_DP_MFN);
+	} else {
+		dp_op = __raw_readl(pllbase + MXC_PLL_DP_HFS_OP);
+		dp_mfd = __raw_readl(pllbase + MXC_PLL_DP_HFS_MFD);
+		dp_mfn = __raw_readl(pllbase + MXC_PLL_DP_HFS_MFN);
+	}
+	pdf = dp_op & MXC_PLL_DP_OP_PDF_MASK;
+	mfi = (dp_op & MXC_PLL_DP_OP_MFI_MASK) >> MXC_PLL_DP_OP_MFI_OFFSET;
+	mfi = (mfi <= 5) ? 5 : mfi;
+	mfd = dp_mfd & MXC_PLL_DP_MFD_MASK;
+	mfn = mfn_abs = dp_mfn & MXC_PLL_DP_MFN_MASK;
+	/* Sign extend to 32-bits */
+	if (mfn >= 0x04000000) {
+		mfn |= 0xFC000000;
+		mfn_abs = -mfn;
+	}
+
+	ref_clk = 2 * parent_rate;
+	if (dbl != 0)
+		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_pll_set_rate(struct clk *clk, unsigned long rate)
+{
+	u32 reg;
+	void __iomem *pllbase;
+
+	long mfi, pdf, mfn, mfd = 999999;
+	s64 temp64;
+	unsigned long quad_parent_rate;
+	unsigned long pll_hfsm, dp_ctl;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	pllbase = _get_pll_base(clk);
+
+	quad_parent_rate = 4 * parent_rate;
+	pdf = mfi = -1;
+	while (++pdf < 16 && mfi < 5)
+		mfi = rate * (pdf+1) / quad_parent_rate;
+	if (mfi > 15)
+		return -EINVAL;
+	pdf--;
+
+	temp64 = rate * (pdf+1) - quad_parent_rate * mfi;
+	do_div(temp64, quad_parent_rate/1000000);
+	mfn = (long)temp64;
+
+	dp_ctl = __raw_readl(pllbase + MXC_PLL_DP_CTL);
+	/* use dpdck0_2 */
+	__raw_writel(dp_ctl | 0x1000L, pllbase + MXC_PLL_DP_CTL);
+	pll_hfsm = dp_ctl & MXC_PLL_DP_CTL_HFSM;
+	if (pll_hfsm == 0) {
+		reg = mfi << 4 | pdf;
+		__raw_writel(reg, pllbase + MXC_PLL_DP_OP);
+		__raw_writel(mfd, pllbase + MXC_PLL_DP_MFD);
+		__raw_writel(mfn, pllbase + MXC_PLL_DP_MFN);
+	} else {
+		reg = mfi << 4 | pdf;
+		__raw_writel(reg, pllbase + MXC_PLL_DP_HFS_OP);
+		__raw_writel(mfd, pllbase + MXC_PLL_DP_HFS_MFD);
+		__raw_writel(mfn, pllbase + MXC_PLL_DP_HFS_MFN);
+	}
+
+	return 0;
+}
+
+static int _clk_pll_enable(struct clk *clk)
+{
+	u32 reg;
+	void __iomem *pllbase;
+	int i = 0;
+
+	pllbase = _get_pll_base(clk);
+	reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) | MXC_PLL_DP_CTL_UPEN;
+	__raw_writel(reg, pllbase + MXC_PLL_DP_CTL);
+
+	/* Wait for lock */
+	do {
+		reg = __raw_readl(pllbase + MXC_PLL_DP_CTL);
+		if (reg & MXC_PLL_DP_CTL_LRF)
+			break;
+
+		udelay(1);
+	} while (++i < MAX_DPLL_WAIT_TRIES);
+
+	if (i == MAX_DPLL_WAIT_TRIES) {
+		pr_err("MX5: pll locking failed\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void _clk_pll_disable(struct clk *clk)
+{
+	u32 reg;
+	void __iomem *pllbase;
+
+	pllbase = _get_pll_base(clk);
+	reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) & ~MXC_PLL_DP_CTL_UPEN;
+	__raw_writel(reg, pllbase + MXC_PLL_DP_CTL);
+}
+
+static int _clk_pll1_sw_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 reg, step;
+
+	reg = __raw_readl(MXC_CCM_CCSR);
+
+	/* When switching from pll_main_clk to a bypass clock, first select a
+	 * multiplexed clock in 'step_sel', then shift the glitchless mux
+	 * 'pll1_sw_clk_sel'.
+	 *
+	 * When switching back, do it in reverse order
+	 */
+	if (parent == &pll1_main_clk) {
+		/* Switch to pll1_main_clk */
+		reg &= ~MXC_CCM_CCSR_PLL1_SW_CLK_SEL;
+		__raw_writel(reg, MXC_CCM_CCSR);
+		/* step_clk mux switched to lp_apm, to save power. */
+		reg = __raw_readl(MXC_CCM_CCSR);
+		reg &= ~MXC_CCM_CCSR_STEP_SEL_MASK;
+		reg |= (MXC_CCM_CCSR_STEP_SEL_LP_APM <<
+				MXC_CCM_CCSR_STEP_SEL_OFFSET);
+	} else {
+		if (parent == &lp_apm_clk) {
+			step = MXC_CCM_CCSR_STEP_SEL_LP_APM;
+		} else  if (parent == &pll2_sw_clk) {
+			step = MXC_CCM_CCSR_STEP_SEL_PLL2_DIVIDED;
+		} else  if (parent == &pll3_sw_clk) {
+			step = MXC_CCM_CCSR_STEP_SEL_PLL3_DIVIDED;
+		} else
+			return -EINVAL;
+
+		reg &= ~MXC_CCM_CCSR_STEP_SEL_MASK;
+		reg |= (step << MXC_CCM_CCSR_STEP_SEL_OFFSET);
+
+		__raw_writel(reg, MXC_CCM_CCSR);
+		/* Switch to step_clk */
+		reg = __raw_readl(MXC_CCM_CCSR);
+		reg |= MXC_CCM_CCSR_PLL1_SW_CLK_SEL;
+	}
+	__raw_writel(reg, MXC_CCM_CCSR);
+	return 0;
+}
+
+static unsigned long clk_pll1_sw_get_rate(struct clk *clk)
+{
+	u32 reg, div;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	reg = __raw_readl(MXC_CCM_CCSR);
+
+	if (clk->parent == &pll2_sw_clk) {
+		div = ((reg & MXC_CCM_CCSR_PLL2_PODF_MASK) >>
+		       MXC_CCM_CCSR_PLL2_PODF_OFFSET) + 1;
+	} else if (clk->parent == &pll3_sw_clk) {
+		div = ((reg & MXC_CCM_CCSR_PLL3_PODF_MASK) >>
+		       MXC_CCM_CCSR_PLL3_PODF_OFFSET) + 1;
+	} else
+		div = 1;
+	return parent_rate / div;
+}
+
+static int _clk_pll2_sw_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 reg;
+
+	reg = __raw_readl(MXC_CCM_CCSR);
+
+	if (parent == &pll2_sw_clk)
+		reg &= ~MXC_CCM_CCSR_PLL2_SW_CLK_SEL;
+	else
+		reg |= MXC_CCM_CCSR_PLL2_SW_CLK_SEL;
+
+	__raw_writel(reg, MXC_CCM_CCSR);
+	return 0;
+}
+
+static int _clk_lp_apm_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 reg;
+
+	if (parent == &osc_clk)
+		reg = __raw_readl(MXC_CCM_CCSR) & ~MXC_CCM_CCSR_LP_APM_SEL;
+	else
+		return -EINVAL;
+
+	__raw_writel(reg, MXC_CCM_CCSR);
+
+	return 0;
+}
+
+static unsigned long clk_cpu_get_rate(struct clk *clk)
+{
+	u32 cacrr, div;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+	cacrr = __raw_readl(MXC_CCM_CACRR);
+	div = (cacrr & MXC_CCM_CACRR_ARM_PODF_MASK) + 1;
+
+	return parent_rate / div;
+}
+
+static int clk_cpu_set_rate(struct clk *clk, unsigned long rate)
+{
+	u32 reg, cpu_podf;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+	cpu_podf = parent_rate / rate - 1;
+	/* use post divider to change freq */
+	reg = __raw_readl(MXC_CCM_CACRR);
+	reg &= ~MXC_CCM_CACRR_ARM_PODF_MASK;
+	reg |= cpu_podf << MXC_CCM_CACRR_ARM_PODF_OFFSET;
+	__raw_writel(reg, MXC_CCM_CACRR);
+
+	return 0;
+}
+
+static int _clk_periph_apm_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 reg, mux;
+	int i = 0;
+
+	mux = _get_mux(parent, &pll1_sw_clk, &pll3_sw_clk, &lp_apm_clk, NULL);
+
+	reg = __raw_readl(MXC_CCM_CBCMR) & ~MXC_CCM_CBCMR_PERIPH_CLK_SEL_MASK;
+	reg |= mux << MXC_CCM_CBCMR_PERIPH_CLK_SEL_OFFSET;
+	__raw_writel(reg, MXC_CCM_CBCMR);
+
+	/* Wait for lock */
+	do {
+		reg = __raw_readl(MXC_CCM_CDHIPR);
+		if (!(reg &  MXC_CCM_CDHIPR_PERIPH_CLK_SEL_BUSY))
+			break;
+
+		udelay(1);
+	} while (++i < MAX_DPLL_WAIT_TRIES);
+
+	if (i == MAX_DPLL_WAIT_TRIES) {
+		pr_err("MX5: Set parent for periph_apm clock failed\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int _clk_main_bus_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 reg;
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+
+	if (parent == &pll2_sw_clk)
+		reg &= ~MXC_CCM_CBCDR_PERIPH_CLK_SEL;
+	else if (parent == &periph_apm_clk)
+		reg |= MXC_CCM_CBCDR_PERIPH_CLK_SEL;
+	else
+		return -EINVAL;
+
+	__raw_writel(reg, MXC_CCM_CBCDR);
+
+	return 0;
+}
+
+static struct clk main_bus_clk = {
+	.parent = &pll2_sw_clk,
+	.set_parent = _clk_main_bus_set_parent,
+};
+
+static unsigned long clk_ahb_get_rate(struct clk *clk)
+{
+	u32 reg, div;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	div = ((reg & MXC_CCM_CBCDR_AHB_PODF_MASK) >>
+	       MXC_CCM_CBCDR_AHB_PODF_OFFSET) + 1;
+	return parent_rate / div;
+}
+
+
+static int _clk_ahb_set_rate(struct clk *clk, unsigned long rate)
+{
+	u32 reg, div;
+	unsigned long parent_rate;
+	int i = 0;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	div = parent_rate / rate;
+	if (div > 8 || div < 1 || ((parent_rate / div) != rate))
+		return -EINVAL;
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	reg &= ~MXC_CCM_CBCDR_AHB_PODF_MASK;
+	reg |= (div - 1) << MXC_CCM_CBCDR_AHB_PODF_OFFSET;
+	__raw_writel(reg, MXC_CCM_CBCDR);
+
+	/* Wait for lock */
+	do {
+		reg = __raw_readl(MXC_CCM_CDHIPR);
+		if (!(reg & MXC_CCM_CDHIPR_AHB_PODF_BUSY))
+			break;
+
+		udelay(1);
+	} while (++i < MAX_DPLL_WAIT_TRIES);
+
+	if (i == MAX_DPLL_WAIT_TRIES) {
+		pr_err("MX5: clk_ahb_set_rate failed\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static unsigned long _clk_ahb_round_rate(struct clk *clk,
+						unsigned long rate)
+{
+	u32 div;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	div = parent_rate / rate;
+	if (div > 8)
+		div = 8;
+	else if (div == 0)
+		div++;
+	return parent_rate / div;
+}
+
+
+static int _clk_max_enable(struct clk *clk)
+{
+	u32 reg;
+
+	_clk_ccgr_enable(clk);
+
+	/* Handshake with MAX when LPM is entered. */
+	reg = __raw_readl(MXC_CCM_CLPCR);
+	if (cpu_is_mx51())
+		reg &= ~MX51_CCM_CLPCR_BYPASS_MAX_LPM_HS;
+	else if (cpu_is_mx53())
+		reg &= ~MX53_CCM_CLPCR_BYPASS_MAX_LPM_HS;
+	__raw_writel(reg, MXC_CCM_CLPCR);
+
+	return 0;
+}
+
+static void _clk_max_disable(struct clk *clk)
+{
+	u32 reg;
+
+	_clk_ccgr_disable_inwait(clk);
+
+	/* No Handshake with MAX when LPM is entered as its disabled. */
+	reg = __raw_readl(MXC_CCM_CLPCR);
+	if (cpu_is_mx51())
+		reg |= MX51_CCM_CLPCR_BYPASS_MAX_LPM_HS;
+	else if (cpu_is_mx53())
+		reg &= ~MX53_CCM_CLPCR_BYPASS_MAX_LPM_HS;
+	__raw_writel(reg, MXC_CCM_CLPCR);
+}
+
+static unsigned long clk_ipg_get_rate(struct clk *clk)
+{
+	u32 reg, div;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	div = ((reg & MXC_CCM_CBCDR_IPG_PODF_MASK) >>
+	       MXC_CCM_CBCDR_IPG_PODF_OFFSET) + 1;
+
+	return parent_rate / div;
+}
+
+static unsigned long clk_ipg_per_get_rate(struct clk *clk)
+{
+	u32 reg, prediv1, prediv2, podf;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	if (clk->parent == &main_bus_clk || clk->parent == &lp_apm_clk) {
+		/* the main_bus_clk is the one before the DVFS engine */
+		reg = __raw_readl(MXC_CCM_CBCDR);
+		prediv1 = ((reg & MXC_CCM_CBCDR_PERCLK_PRED1_MASK) >>
+			   MXC_CCM_CBCDR_PERCLK_PRED1_OFFSET) + 1;
+		prediv2 = ((reg & MXC_CCM_CBCDR_PERCLK_PRED2_MASK) >>
+			   MXC_CCM_CBCDR_PERCLK_PRED2_OFFSET) + 1;
+		podf = ((reg & MXC_CCM_CBCDR_PERCLK_PODF_MASK) >>
+			MXC_CCM_CBCDR_PERCLK_PODF_OFFSET) + 1;
+		return parent_rate / (prediv1 * prediv2 * podf);
+	} else if (clk->parent == &ipg_clk)
+		return parent_rate;
+	else
+		BUG();
+}
+
+static int _clk_ipg_per_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 reg;
+
+	reg = __raw_readl(MXC_CCM_CBCMR);
+
+	reg &= ~MXC_CCM_CBCMR_PERCLK_LP_APM_CLK_SEL;
+	reg &= ~MXC_CCM_CBCMR_PERCLK_IPG_CLK_SEL;
+
+	if (parent == &ipg_clk)
+		reg |= MXC_CCM_CBCMR_PERCLK_IPG_CLK_SEL;
+	else if (parent == &lp_apm_clk)
+		reg |= MXC_CCM_CBCMR_PERCLK_LP_APM_CLK_SEL;
+	else if (parent != &main_bus_clk)
+		return -EINVAL;
+
+	__raw_writel(reg, MXC_CCM_CBCMR);
+
+	return 0;
+}
+
+#define clk_nfc_set_parent	NULL
+
+static unsigned long clk_nfc_get_rate(struct clk *clk)
+{
+	unsigned long rate;
+	u32 reg, div;
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	div = ((reg & MXC_CCM_CBCDR_NFC_PODF_MASK) >>
+	       MXC_CCM_CBCDR_NFC_PODF_OFFSET) + 1;
+	rate = clk_get_rate(clk->parent) / div;
+	WARN_ON(rate == 0);
+	return rate;
+}
+
+static unsigned long clk_nfc_round_rate(struct clk *clk,
+						unsigned long rate)
+{
+	u32 div;
+	unsigned long parent_rate = clk_get_rate(clk->parent);
+
+	if (!rate)
+		return -EINVAL;
+
+	div = parent_rate / rate;
+
+	if (parent_rate % rate)
+		div++;
+
+	if (div > 8)
+		return -EINVAL;
+
+	return parent_rate / div;
+
+}
+
+static int clk_nfc_set_rate(struct clk *clk, unsigned long rate)
+{
+	u32 reg, div;
+
+	div = clk_get_rate(clk->parent) / rate;
+	if (div == 0)
+		div++;
+	if (((clk_get_rate(clk->parent) / div) != rate) || (div > 8))
+		return -EINVAL;
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	reg &= ~MXC_CCM_CBCDR_NFC_PODF_MASK;
+	reg |= (div - 1) << MXC_CCM_CBCDR_NFC_PODF_OFFSET;
+	__raw_writel(reg, MXC_CCM_CBCDR);
+
+	while (__raw_readl(MXC_CCM_CDHIPR) &
+			MXC_CCM_CDHIPR_NFC_IPG_INT_MEM_PODF_BUSY){
+	}
+
+	return 0;
+}
+
+static unsigned long get_high_reference_clock_rate(struct clk *clk)
+{
+	return external_high_reference;
+}
+
+static unsigned long get_low_reference_clock_rate(struct clk *clk)
+{
+	return external_low_reference;
+}
+
+static unsigned long get_oscillator_reference_clock_rate(struct clk *clk)
+{
+	return oscillator_reference;
+}
+
+static unsigned long get_ckih2_reference_clock_rate(struct clk *clk)
+{
+	return ckih2_reference;
+}
+
+static unsigned long clk_emi_slow_get_rate(struct clk *clk)
+{
+	u32 reg, div;
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	div = ((reg & MXC_CCM_CBCDR_EMI_PODF_MASK) >>
+	       MXC_CCM_CBCDR_EMI_PODF_OFFSET) + 1;
+
+	return clk_get_rate(clk->parent) / div;
+}
+
+/* External high frequency clock */
+static struct clk ckih_clk = {
+	.get_rate = get_high_reference_clock_rate,
+};
+
+static struct clk ckih2_clk = {
+	.get_rate = get_ckih2_reference_clock_rate,
+};
+
+static struct clk osc_clk = {
+	.get_rate = get_oscillator_reference_clock_rate,
+};
+
+/* External low frequency (32kHz) clock */
+static struct clk ckil_clk = {
+	.get_rate = get_low_reference_clock_rate,
+};
+
+static struct clk pll1_main_clk = {
+	.parent = &osc_clk,
+	.get_rate = clk_pll_get_rate,
+	.enable = _clk_pll_enable,
+	.disable = _clk_pll_disable,
+};
+
+/* Clock tree block diagram (WIP):
+ * 	CCM: Clock Controller Module
+ *
+ * PLL output -> |
+ *               | CCM Switcher -> CCM_CLK_ROOT_GEN ->
+ * PLL bypass -> |
+ *
+ */
+
+/* PLL1 SW supplies to ARM core */
+static struct clk pll1_sw_clk = {
+	.parent = &pll1_main_clk,
+	.set_parent = _clk_pll1_sw_set_parent,
+	.get_rate = clk_pll1_sw_get_rate,
+};
+
+/* PLL2 SW supplies to AXI/AHB/IP buses */
+static struct clk pll2_sw_clk = {
+	.parent = &osc_clk,
+	.get_rate = clk_pll_get_rate,
+	.set_rate = _clk_pll_set_rate,
+	.set_parent = _clk_pll2_sw_set_parent,
+	.enable = _clk_pll_enable,
+	.disable = _clk_pll_disable,
+};
+
+/* PLL3 SW supplies to serial clocks like USB, SSI, etc. */
+static struct clk pll3_sw_clk = {
+	.parent = &osc_clk,
+	.set_rate = _clk_pll_set_rate,
+	.get_rate = clk_pll_get_rate,
+	.enable = _clk_pll_enable,
+	.disable = _clk_pll_disable,
+};
+
+/* PLL4 SW supplies to LVDS Display Bridge(LDB) */
+static struct clk mx53_pll4_sw_clk = {
+	.parent = &osc_clk,
+	.set_rate = _clk_pll_set_rate,
+	.enable = _clk_pll_enable,
+	.disable = _clk_pll_disable,
+};
+
+/* Low-power Audio Playback Mode clock */
+static struct clk lp_apm_clk = {
+	.parent = &osc_clk,
+	.set_parent = _clk_lp_apm_set_parent,
+};
+
+static struct clk periph_apm_clk = {
+	.parent = &pll1_sw_clk,
+	.set_parent = _clk_periph_apm_set_parent,
+};
+
+static struct clk cpu_clk = {
+	.parent = &pll1_sw_clk,
+	.get_rate = clk_cpu_get_rate,
+	.set_rate = clk_cpu_set_rate,
+};
+
+static struct clk ahb_clk = {
+	.parent = &main_bus_clk,
+	.get_rate = clk_ahb_get_rate,
+	.set_rate = _clk_ahb_set_rate,
+	.round_rate = _clk_ahb_round_rate,
+};
+
+/* Main IP interface clock for access to registers */
+static struct clk ipg_clk = {
+	.parent = &ahb_clk,
+	.get_rate = clk_ipg_get_rate,
+};
+
+static struct clk ipg_perclk = {
+	.parent = &lp_apm_clk,
+	.get_rate = clk_ipg_per_get_rate,
+	.set_parent = _clk_ipg_per_set_parent,
+};
+
+static struct clk ahb_max_clk = {
+	.parent = &ahb_clk,
+	.enable_reg = MXC_CCM_CCGR0,
+	.enable_shift = MXC_CCM_CCGRx_CG14_OFFSET,
+	.enable = _clk_max_enable,
+	.disable = _clk_max_disable,
+};
+
+static struct clk aips_tz1_clk = {
+	.parent = &ahb_clk,
+	.secondary = &ahb_max_clk,
+	.enable_reg = MXC_CCM_CCGR0,
+	.enable_shift = MXC_CCM_CCGRx_CG12_OFFSET,
+	.enable = _clk_ccgr_enable,
+	.disable = _clk_ccgr_disable_inwait,
+};
+
+static struct clk aips_tz2_clk = {
+	.parent = &ahb_clk,
+	.secondary = &ahb_max_clk,
+	.enable_reg = MXC_CCM_CCGR0,
+	.enable_shift = MXC_CCM_CCGRx_CG13_OFFSET,
+	.enable = _clk_ccgr_enable,
+	.disable = _clk_ccgr_disable_inwait,
+};
+
+static struct clk gpt_32k_clk = {
+	.id = 0,
+	.parent = &ckil_clk,
+};
+
+static struct clk kpp_clk = {
+	.id = 0,
+};
+
+static struct clk emi_slow_clk = {
+	.parent = &pll2_sw_clk,
+	.enable_reg = MXC_CCM_CCGR5,
+	.enable_shift = MXC_CCM_CCGRx_CG8_OFFSET,
+	.enable = _clk_ccgr_enable,
+	.disable = _clk_ccgr_disable_inwait,
+	.get_rate = clk_emi_slow_get_rate,
+};
+
+#define DEFINE_CLOCK_CCGR(name, i, er, es, pfx, p, s)	\
+	static struct clk name = {			\
+		.id		= i,			\
+		.enable_reg	= er,			\
+		.enable_shift	= es,			\
+		.get_rate	= pfx##_get_rate,	\
+		.set_rate	= pfx##_set_rate,	\
+		.round_rate	= pfx##_round_rate,	\
+		.set_parent	= pfx##_set_parent,	\
+		.enable		= _clk_ccgr_enable,	\
+		.disable	= _clk_ccgr_disable,	\
+		.parent		= p,			\
+		.secondary	= s,			\
+	}
+
+#define DEFINE_CLOCK_MAX(name, i, er, es, pfx, p, s)	\
+	static struct clk name = {			\
+		.id		= i,			\
+		.enable_reg	= er,			\
+		.enable_shift	= es,			\
+		.get_rate	= pfx##_get_rate,	\
+		.set_rate	= pfx##_set_rate,	\
+		.set_parent	= pfx##_set_parent,	\
+		.enable		= _clk_max_enable,	\
+		.disable	= _clk_max_disable,	\
+		.parent		= p,			\
+		.secondary	= s,			\
+	}
+
+#define CLK_GET_RATE(name, nr, bitsname)				\
+static unsigned long clk_##name##_get_rate(struct clk *clk)		\
+{									\
+	u32 reg, pred, podf;						\
+									\
+	reg = __raw_readl(MXC_CCM_CSCDR##nr);				\
+	pred = (reg & MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_MASK)	\
+		>> MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_OFFSET;	\
+	podf = (reg & MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_MASK)	\
+		>> MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_OFFSET;	\
+									\
+	return DIV_ROUND_CLOSEST(clk_get_rate(clk->parent),		\
+			(pred + 1) * (podf + 1));			\
+}
+
+#define CLK_SET_PARENT(name, nr, bitsname)				\
+static int clk_##name##_set_parent(struct clk *clk, struct clk *parent)	\
+{									\
+	u32 reg, mux;							\
+									\
+	mux = _get_mux(parent, &pll1_sw_clk, &pll2_sw_clk,		\
+			&pll3_sw_clk, &lp_apm_clk);			\
+	reg = __raw_readl(MXC_CCM_CSCMR##nr) &				\
+		~MXC_CCM_CSCMR##nr##_##bitsname##_CLK_SEL_MASK;		\
+	reg |= mux << MXC_CCM_CSCMR##nr##_##bitsname##_CLK_SEL_OFFSET;	\
+	__raw_writel(reg, MXC_CCM_CSCMR##nr);				\
+									\
+	return 0;							\
+}
+
+#define CLK_SET_RATE(name, nr, bitsname)				\
+static int clk_##name##_set_rate(struct clk *clk, unsigned long rate)	\
+{									\
+	u32 reg, div, parent_rate;					\
+	u32 pre = 0, post = 0;						\
+									\
+	parent_rate = clk_get_rate(clk->parent);			\
+	div = parent_rate / rate;					\
+									\
+	if ((parent_rate / div) != rate)				\
+		return -EINVAL;						\
+									\
+	__calc_pre_post_dividers(div, &pre, &post,			\
+		(MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_MASK >>	\
+		MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_OFFSET) + 1,	\
+		(MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_MASK >>	\
+		MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_OFFSET) + 1);\
+									\
+	/* Set sdhc1 clock divider */					\
+	reg = __raw_readl(MXC_CCM_CSCDR##nr) &				\
+		~(MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_MASK	\
+		| MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_MASK);	\
+	reg |= (post - 1) <<						\
+		MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_OFFSET;	\
+	reg |= (pre - 1) <<						\
+		MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_OFFSET;	\
+	__raw_writel(reg, MXC_CCM_CSCDR##nr);				\
+									\
+	return 0;							\
+}
+
+/* UART */
+CLK_GET_RATE(uart, 1, UART)
+CLK_SET_PARENT(uart, 1, UART)
+
+static struct clk uart_root_clk = {
+	.parent = &pll2_sw_clk,
+	.get_rate = clk_uart_get_rate,
+	.set_parent = clk_uart_set_parent,
+};
+
+/* USBOH3 */
+CLK_GET_RATE(usboh3, 1, USBOH3)
+CLK_SET_PARENT(usboh3, 1, USBOH3)
+
+static struct clk usboh3_clk = {
+	.parent = &pll2_sw_clk,
+	.get_rate = clk_usboh3_get_rate,
+	.set_parent = clk_usboh3_set_parent,
+};
+
+/* eCSPI */
+CLK_GET_RATE(ecspi, 2, CSPI)
+CLK_SET_PARENT(ecspi, 1, CSPI)
+
+static struct clk ecspi_main_clk = {
+	.parent = &pll3_sw_clk,
+	.get_rate = clk_ecspi_get_rate,
+	.set_parent = clk_ecspi_set_parent,
+};
+
+/* eSDHC */
+CLK_GET_RATE(esdhc1, 1, ESDHC1_MSHC1)
+CLK_SET_PARENT(esdhc1, 1, ESDHC1_MSHC1)
+CLK_SET_RATE(esdhc1, 1, ESDHC1_MSHC1)
+
+CLK_GET_RATE(esdhc2, 1, ESDHC2_MSHC2)
+CLK_SET_PARENT(esdhc2, 1, ESDHC2_MSHC2)
+CLK_SET_RATE(esdhc2, 1, ESDHC2_MSHC2)
+
+#define DEFINE_CLOCK_FULL(name, i, er, es, gr, sr, e, d, p, s)		\
+	static struct clk name = {					\
+		.id		= i,					\
+		.enable_reg	= er,					\
+		.enable_shift	= es,					\
+		.get_rate	= gr,					\
+		.set_rate	= sr,					\
+		.enable		= e,					\
+		.disable	= d,					\
+		.parent		= p,					\
+		.secondary	= s,					\
+	}
+
+#define DEFINE_CLOCK(name, i, er, es, gr, sr, p, s)			\
+	DEFINE_CLOCK_FULL(name, i, er, es, gr, sr, _clk_ccgr_enable, _clk_ccgr_disable, p, s)
+
+/* Shared peripheral bus arbiter */
+DEFINE_CLOCK(spba_clk, 0, MXC_CCM_CCGR5, MXC_CCM_CCGRx_CG0_OFFSET,
+	NULL,  NULL, &ipg_clk, NULL);
+
+/* UART */
+DEFINE_CLOCK(uart1_ipg_clk, 0, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG3_OFFSET,
+	NULL,  NULL, &ipg_clk, &aips_tz1_clk);
+DEFINE_CLOCK(uart2_ipg_clk, 1, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG5_OFFSET,
+	NULL,  NULL, &ipg_clk, &aips_tz1_clk);
+DEFINE_CLOCK(uart3_ipg_clk, 2, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG7_OFFSET,
+	NULL,  NULL, &ipg_clk, &spba_clk);
+DEFINE_CLOCK(uart1_clk, 0, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG4_OFFSET,
+	NULL,  NULL, &uart_root_clk, &uart1_ipg_clk);
+DEFINE_CLOCK(uart2_clk, 1, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG6_OFFSET,
+	NULL,  NULL, &uart_root_clk, &uart2_ipg_clk);
+DEFINE_CLOCK(uart3_clk, 2, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG8_OFFSET,
+	NULL,  NULL, &uart_root_clk, &uart3_ipg_clk);
+
+/* GPT */
+DEFINE_CLOCK(gpt_ipg_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG10_OFFSET,
+	NULL,  NULL, &ipg_clk, NULL);
+DEFINE_CLOCK(gpt_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG9_OFFSET,
+	NULL,  NULL, &ipg_clk, &gpt_ipg_clk);
+
+/* I2C */
+DEFINE_CLOCK(i2c1_clk, 0, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG9_OFFSET,
+	NULL, NULL, &ipg_clk, NULL);
+DEFINE_CLOCK(i2c2_clk, 1, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG10_OFFSET,
+	NULL, NULL, &ipg_clk, NULL);
+DEFINE_CLOCK(hsi2c_clk, 0, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG11_OFFSET,
+	NULL, NULL, &ipg_clk, NULL);
+
+/* FEC */
+DEFINE_CLOCK(fec_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG12_OFFSET,
+	NULL,  NULL, &ipg_clk, NULL);
+
+/* NFC */
+DEFINE_CLOCK_CCGR(nfc_clk, 0, MXC_CCM_CCGR5, MXC_CCM_CCGRx_CG10_OFFSET,
+	clk_nfc, &emi_slow_clk, NULL);
+
+/* SSI */
+DEFINE_CLOCK(ssi1_ipg_clk, 0, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG8_OFFSET,
+	NULL, NULL, &ipg_clk, NULL);
+DEFINE_CLOCK(ssi1_clk, 0, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG9_OFFSET,
+	NULL, NULL, &pll3_sw_clk, &ssi1_ipg_clk);
+DEFINE_CLOCK(ssi2_ipg_clk, 1, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG10_OFFSET,
+	NULL, NULL, &ipg_clk, NULL);
+DEFINE_CLOCK(ssi2_clk, 1, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG11_OFFSET,
+	NULL, NULL, &pll3_sw_clk, &ssi2_ipg_clk);
+
+/* eCSPI */
+DEFINE_CLOCK_FULL(ecspi1_ipg_clk, 0, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG9_OFFSET,
+		NULL, NULL, _clk_ccgr_enable_inrun, _clk_ccgr_disable,
+		&ipg_clk, &spba_clk);
+DEFINE_CLOCK(ecspi1_clk, 0, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG10_OFFSET,
+		NULL, NULL, &ecspi_main_clk, &ecspi1_ipg_clk);
+DEFINE_CLOCK_FULL(ecspi2_ipg_clk, 0, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG11_OFFSET,
+		NULL, NULL, _clk_ccgr_enable_inrun, _clk_ccgr_disable,
+		&ipg_clk, &aips_tz2_clk);
+DEFINE_CLOCK(ecspi2_clk, 0, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG12_OFFSET,
+		NULL, NULL, &ecspi_main_clk, &ecspi2_ipg_clk);
+
+/* CSPI */
+DEFINE_CLOCK(cspi_ipg_clk, 0, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG9_OFFSET,
+		NULL, NULL, &ipg_clk, &aips_tz2_clk);
+DEFINE_CLOCK(cspi_clk, 0, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG13_OFFSET,
+		NULL, NULL, &ipg_clk, &cspi_ipg_clk);
+
+/* SDMA */
+DEFINE_CLOCK(sdma_clk, 1, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG15_OFFSET,
+		NULL, NULL, &ahb_clk, NULL);
+
+/* eSDHC */
+DEFINE_CLOCK_FULL(esdhc1_ipg_clk, 0, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG0_OFFSET,
+	NULL,  NULL, _clk_max_enable, _clk_max_disable, &ipg_clk, NULL);
+DEFINE_CLOCK_MAX(esdhc1_clk, 0, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG1_OFFSET,
+	clk_esdhc1, &pll2_sw_clk, &esdhc1_ipg_clk);
+DEFINE_CLOCK_FULL(esdhc2_ipg_clk, 1, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG2_OFFSET,
+	NULL,  NULL, _clk_max_enable, _clk_max_disable, &ipg_clk, NULL);
+DEFINE_CLOCK_MAX(esdhc2_clk, 1, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG3_OFFSET,
+	clk_esdhc2, &pll2_sw_clk, &esdhc2_ipg_clk);
+
+#define _REGISTER_CLOCK(d, n, c) \
+       { \
+		.dev_id = d, \
+		.con_id = n, \
+		.clk = &c,   \
+       },
+
+static struct clk_lookup mx51_lookups[] = {
+	_REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk)
+	_REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk)
+	_REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
+	_REGISTER_CLOCK(NULL, "gpt", gpt_clk)
+	_REGISTER_CLOCK("fec.0", NULL, fec_clk)
+	_REGISTER_CLOCK("imx-i2c.0", NULL, i2c1_clk)
+	_REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
+	_REGISTER_CLOCK("imx-i2c.2", NULL, hsi2c_clk)
+	_REGISTER_CLOCK("mxc-ehci.0", "usb", usboh3_clk)
+	_REGISTER_CLOCK("mxc-ehci.0", "usb_ahb", ahb_clk)
+	_REGISTER_CLOCK("mxc-ehci.1", "usb", usboh3_clk)
+	_REGISTER_CLOCK("mxc-ehci.1", "usb_ahb", ahb_clk)
+	_REGISTER_CLOCK("fsl-usb2-udc", "usb", usboh3_clk)
+	_REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", ahb_clk)
+	_REGISTER_CLOCK("imx-keypad.0", NULL, kpp_clk)
+	_REGISTER_CLOCK("mxc_nand", NULL, nfc_clk)
+	_REGISTER_CLOCK("imx-ssi.0", NULL, ssi1_clk)
+	_REGISTER_CLOCK("imx-ssi.1", NULL, ssi2_clk)
+	_REGISTER_CLOCK("imx-sdma", NULL, sdma_clk)
+	_REGISTER_CLOCK(NULL, "ckih", ckih_clk)
+	_REGISTER_CLOCK(NULL, "ckih2", ckih2_clk)
+	_REGISTER_CLOCK(NULL, "gpt_32k", gpt_32k_clk)
+	_REGISTER_CLOCK("imx51-ecspi.0", NULL, ecspi1_clk)
+	_REGISTER_CLOCK("imx51-ecspi.1", NULL, ecspi2_clk)
+	_REGISTER_CLOCK("imx51-cspi.0", NULL, cspi_clk)
+	_REGISTER_CLOCK("sdhci-esdhc-imx.0", NULL, esdhc1_clk)
+	_REGISTER_CLOCK("sdhci-esdhc-imx.1", NULL, esdhc2_clk)
+	_REGISTER_CLOCK(NULL, "cpu_clk", cpu_clk)
+};
+
+static struct clk_lookup mx53_lookups[] = {
+	_REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk)
+	_REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk)
+	_REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
+	_REGISTER_CLOCK(NULL, "gpt", gpt_clk)
+	_REGISTER_CLOCK("fec.0", NULL, fec_clk)
+};
+
+static void clk_tree_init(void)
+{
+	u32 reg;
+
+	ipg_perclk.set_parent(&ipg_perclk, &lp_apm_clk);
+
+	/*
+	 * Initialise the IPG PER CLK dividers to 3. IPG_PER_CLK should be at
+	 * 8MHz, its derived from lp_apm.
+	 *
+	 * FIXME: Verify if true for all boards
+	 */
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	reg &= ~MXC_CCM_CBCDR_PERCLK_PRED1_MASK;
+	reg &= ~MXC_CCM_CBCDR_PERCLK_PRED2_MASK;
+	reg &= ~MXC_CCM_CBCDR_PERCLK_PODF_MASK;
+	reg |= (2 << MXC_CCM_CBCDR_PERCLK_PRED1_OFFSET);
+	__raw_writel(reg, MXC_CCM_CBCDR);
+}
+
+int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
+			unsigned long ckih1, unsigned long ckih2)
+{
+	int i;
+
+	external_low_reference = ckil;
+	external_high_reference = ckih1;
+	ckih2_reference = ckih2;
+	oscillator_reference = osc;
+
+	for (i = 0; i < ARRAY_SIZE(mx51_lookups); i++)
+		clkdev_add(&mx51_lookups[i]);
+
+	clk_tree_init();
+
+	clk_enable(&cpu_clk);
+	clk_enable(&main_bus_clk);
+
+	/* set the usboh3_clk parent to pll2_sw_clk */
+	clk_set_parent(&usboh3_clk, &pll2_sw_clk);
+
+	/* Set SDHC parents to be PLL2 */
+	clk_set_parent(&esdhc1_clk, &pll2_sw_clk);
+	clk_set_parent(&esdhc2_clk, &pll2_sw_clk);
+
+	/* set SDHC root clock as 166.25MHZ*/
+	clk_set_rate(&esdhc1_clk, 166250000);
+	clk_set_rate(&esdhc2_clk, 166250000);
+
+	/* System timer */
+	mxc_timer_init(&gpt_clk, MX51_IO_ADDRESS(MX51_GPT1_BASE_ADDR),
+		MX51_MXC_INT_GPT);
+	return 0;
+}
+
+int __init mx53_clocks_init(unsigned long ckil, unsigned long osc,
+			unsigned long ckih1, unsigned long ckih2)
+{
+	int i;
+
+	external_low_reference = ckil;
+	external_high_reference = ckih1;
+	ckih2_reference = ckih2;
+	oscillator_reference = osc;
+
+	for (i = 0; i < ARRAY_SIZE(mx53_lookups); i++)
+		clkdev_add(&mx53_lookups[i]);
+
+	clk_tree_init();
+
+	clk_enable(&cpu_clk);
+	clk_enable(&main_bus_clk);
+
+	/* System timer */
+	mxc_timer_init(&gpt_clk, MX53_IO_ADDRESS(MX53_GPT1_BASE_ADDR),
+		MX53_INT_GPT);
+	return 0;
+}