1 files changed, 825 insertions, 0 deletions

diff --git a/arch/arm/mach-mx5/clock-mx51.c b/arch/arm/mach-mx5/clock-mx51.c
new file mode 100644
index 000000000000..be90c03101cd
--- /dev/null
+++ b/arch/arm/mach-mx5/clock-mx51.c
@@ -0,0 +1,825 @@
+/*
+ * 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 <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 lp_apm_clk;
+static struct clk periph_apm_clk;
+static struct clk ahb_clk;
+static struct clk ipg_clk;
+
+#define MAX_DPLL_WAIT_TRIES     1000 /* 1000 * udelay(1) = 1ms */
+
+static int _clk_ccgr_enable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(clk->enable_reg);
+        reg |= MXC_CCM_CCGRx_MOD_ON << clk->enable_shift;
+        __raw_writel(reg, clk->enable_reg);
+
+        return 0;
+}
+
+static void _clk_ccgr_disable(struct clk *clk)
+{
+        u32 reg;
+        reg = __raw_readl(clk->enable_reg);
+        reg &= ~(MXC_CCM_CCGRx_MOD_OFF << clk->enable_shift);
+        __raw_writel(reg, clk->enable_reg);
+
+}
+
+static void _clk_ccgr_disable_inwait(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(clk->enable_reg);
+        reg &= ~(MXC_CCM_CCGRx_CG_MASK << clk->enable_shift);
+        reg |= MXC_CCM_CCGRx_MOD_IDLE << clk->enable_shift;
+        __raw_writel(reg, clk->enable_reg);
+}
+
+/*
+ * 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
+                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_arm_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_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);
+        reg &= ~MXC_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);
+        reg |= MXC_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;
+}
+
+static unsigned long clk_uart_get_rate(struct clk *clk)
+{
+        u32 reg, prediv, podf;
+        unsigned long parent_rate;
+
+        parent_rate = clk_get_rate(clk->parent);
+
+        reg = __raw_readl(MXC_CCM_CSCDR1);
+        prediv = ((reg & MXC_CCM_CSCDR1_UART_CLK_PRED_MASK) >>
+                  MXC_CCM_CSCDR1_UART_CLK_PRED_OFFSET) + 1;
+        podf = ((reg & MXC_CCM_CSCDR1_UART_CLK_PODF_MASK) >>
+                MXC_CCM_CSCDR1_UART_CLK_PODF_OFFSET) + 1;
+
+        return parent_rate / (prediv * podf);
+}
+
+static int _clk_uart_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_CSCMR1) & ~MXC_CCM_CSCMR1_UART_CLK_SEL_MASK;
+        reg |= mux << MXC_CCM_CSCMR1_UART_CLK_SEL_OFFSET;
+        __raw_writel(reg, MXC_CCM_CSCMR1);
+
+        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;
+}
+
+/* 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,
+};
+
+/* 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_arm_get_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 uart_root_clk = {
+        .parent = &pll2_sw_clk,
+        .get_rate = clk_uart_get_rate,
+        .set_parent = _clk_uart_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,
+};
+
+#define DEFINE_CLOCK(name, i, er, es, gr, sr, p, s)     \
+        static struct clk name = {                      \
+                .id             = i,                    \
+                .enable_reg     = er,                   \
+                .enable_shift   = es,                   \
+                .get_rate       = gr,                   \
+                .set_rate       = sr,                   \
+                .enable         = _clk_ccgr_enable,     \
+                .disable        = _clk_ccgr_disable,    \
+                .parent         = p,                    \
+                .secondary      = s,                    \
+        }
+
+/* DEFINE_CLOCK(name, id, enable_reg, enable_shift,
+   get_rate, set_rate, parent, secondary); */
+
+/* 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_clk, 0, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG4_OFFSET,
+        NULL,  NULL, &uart_root_clk, NULL);
+DEFINE_CLOCK(uart2_clk, 1, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG6_OFFSET,
+        NULL,  NULL, &uart_root_clk, NULL);
+DEFINE_CLOCK(uart3_clk, 2, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG8_OFFSET,
+        NULL,  NULL, &uart_root_clk, NULL);
+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);
+
+/* GPT */
+DEFINE_CLOCK(gpt_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG9_OFFSET,
+        NULL,  NULL, &ipg_perclk, NULL);
+DEFINE_CLOCK(gpt_ipg_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG10_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);
+
+#define _REGISTER_CLOCK(d, n, c) \
+       { \
+                .dev_id = d, \
+                .con_id = n, \
+                .clk = &c,   \
+       },
+
+static struct clk_lookup 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(lookups); i++)
+                clkdev_add(&lookups[i]);
+
+        clk_tree_init();
+
+        clk_enable(&cpu_clk);
+        clk_enable(&main_bus_clk);
+
+        /* System timer */
+        mxc_timer_init(&gpt_clk, MX51_IO_ADDRESS(MX51_GPT1_BASE_ADDR),
+                MX51_MXC_INT_GPT);
+        return 0;
+}