arm/imx21: clock support for i.MX21

Based on code from "Martin Fuzzey" <mfuzzey@gmail.com>

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

4 files changed, 1245 insertions, 0 deletions

diff --git a/arch/arm/mach-mx2/Makefile b/arch/arm/mach-mx2/Makefile
index 382d86080e86..6e1a2bffc812 100644
--- a/arch/arm/mach-mx2/Makefile
+++ b/arch/arm/mach-mx2/Makefile
@@ -6,6 +6,8 @@
 
 obj-y	:=  system.o generic.o devices.o serial.o
 
+obj-$(CONFIG_MACH_MX21) += clock_imx21.o
+
 obj-$(CONFIG_MACH_MX27) += cpu_imx27.o
 obj-$(CONFIG_MACH_MX27) += clock_imx27.o
 
diff --git a/arch/arm/mach-mx2/clock_imx21.c b/arch/arm/mach-mx2/clock_imx21.c
new file mode 100644
index 000000000000..2dee5c87614c
--- /dev/null
+++ b/arch/arm/mach-mx2/clock_imx21.c
@@ -0,0 +1,984 @@
+/*
+ * 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 <mach/clock.h>
+#include <mach/common.h>
+#include <asm/clkdev.h>
+#include <asm/div64.h>
+
+#include "crm_regs.h"
+
+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 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)
+{
+	u32 div;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+
+	div = parent_rate / rate;
+	if (parent_rate % rate)
+		div++;
+
+	if (div > 64)
+		div = 64;
+
+	return parent_rate / div;
+}
+
+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_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,
+		.get_rate = _clk_usb_recalc,
+		.enable = _clk_enable,
+		.enable_reg = CCM_PCCR_USBOTG_REG,
+		.enable_shift = CCM_PCCR_USBOTG_OFFSET,
+		.disable = _clk_disable,
+	}, {
+		.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)
+{
+	u32 div;
+	unsigned long parent_rate;
+
+	parent_rate = clk_get_rate(clk->parent);
+	div = parent_rate / rate;
+	if (parent_rate % rate)
+		div++;
+
+	if (div > 8)
+		div = 8;
+
+	return parent_rate / div;
+}
+
+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[] __initdata = {
+/* 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("imx-uart.0", NULL, uart_clk[0])
+	_REGISTER_CLOCK("imx-uart.1", NULL, uart_clk[1])
+	_REGISTER_CLOCK("imx-uart.2", NULL, uart_clk[2])
+	_REGISTER_CLOCK("imx-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(NULL, "cspi1", cspi_clk[0])
+	_REGISTER_CLOCK(NULL, "cspi2", cspi_clk[1])
+	_REGISTER_CLOCK(NULL, "cspi3", cspi_clk[2])
+	_REGISTER_CLOCK(NULL, "lcdc", lcdc_clk[0])
+	_REGISTER_CLOCK(NULL, "csi", csi_clk[0])
+	_REGISTER_CLOCK(NULL, "usb", usb_clk[0])
+	_REGISTER_CLOCK(NULL, "ssi1", ssi_clk[0])
+	_REGISTER_CLOCK(NULL, "ssi2", ssi_clk[1])
+	_REGISTER_CLOCK(NULL, "nfc", 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(NULL, "wdog", wdog_clk)
+	_REGISTER_CLOCK(NULL, "gpio", gpio_clk)
+	_REGISTER_CLOCK(NULL, "i2c", 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)
+{
+	int i;
+	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;
+
+	for (i = 0; i < ARRAY_SIZE(lookups); i++)
+		clkdev_add(&lookups[i]);
+
+	/* 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);
+
+#ifdef CONFIG_DEBUG_LL_CONSOLE
+	clk_enable(&uart_clk[0]);
+#endif
+
+	mxc_timer_init(&gpt_clk[0]);
+	return 0;
+}
diff --git a/arch/arm/mach-mx2/crm_regs.h b/arch/arm/mach-mx2/crm_regs.h
new file mode 100644
index 000000000000..749de76b3f95
--- /dev/null
+++ b/arch/arm/mach-mx2/crm_regs.h
@@ -0,0 +1,258 @@
+/*
+ * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Juergen Beisert, 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.
+ */
+
+#ifndef __ARCH_ARM_MACH_MX2_CRM_REGS_H__
+#define __ARCH_ARM_MACH_MX2_CRM_REGS_H__
+
+#include <mach/hardware.h>
+
+/* Register offsets */
+#define CCM_CSCR                (IO_ADDRESS(CCM_BASE_ADDR) + 0x0)
+#define CCM_MPCTL0              (IO_ADDRESS(CCM_BASE_ADDR) + 0x4)
+#define CCM_MPCTL1              (IO_ADDRESS(CCM_BASE_ADDR) + 0x8)
+#define CCM_SPCTL0              (IO_ADDRESS(CCM_BASE_ADDR) + 0xC)
+#define CCM_SPCTL1              (IO_ADDRESS(CCM_BASE_ADDR) + 0x10)
+#define CCM_OSC26MCTL           (IO_ADDRESS(CCM_BASE_ADDR) + 0x14)
+#define CCM_PCDR0               (IO_ADDRESS(CCM_BASE_ADDR) + 0x18)
+#define CCM_PCDR1               (IO_ADDRESS(CCM_BASE_ADDR) + 0x1c)
+#define CCM_PCCR0               (IO_ADDRESS(CCM_BASE_ADDR) + 0x20)
+#define CCM_PCCR1               (IO_ADDRESS(CCM_BASE_ADDR) + 0x24)
+#define CCM_CCSR                (IO_ADDRESS(CCM_BASE_ADDR) + 0x28)
+#define CCM_PMCTL               (IO_ADDRESS(CCM_BASE_ADDR) + 0x2c)
+#define CCM_PMCOUNT             (IO_ADDRESS(CCM_BASE_ADDR) + 0x30)
+#define CCM_WKGDCTL             (IO_ADDRESS(CCM_BASE_ADDR) + 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 */
+
+#endif /* __ARCH_ARM_MACH_MX2_CRM_REGS_H__ */
diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h
index 2c08b8e14e39..3051eee99530 100644
--- a/arch/arm/plat-mxc/include/mach/common.h
+++ b/arch/arm/plat-mxc/include/mach/common.h
@@ -18,6 +18,7 @@ extern void mxc_map_io(void);
 extern void mxc_init_irq(void);
 extern void mxc_timer_init(struct clk *timer_clk);
 extern int mx1_clocks_init(unsigned long fref);
+extern int mx21_clocks_init(unsigned long lref, unsigned long fref);
 extern int mx27_clocks_init(unsigned long fref);
 extern int mx31_clocks_init(unsigned long fref);
 extern int mxc_register_gpios(void);