ARM: mxs: Add clock support

Add clock for MXS-based SoCs, MX23 and MX28.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

1 files changed, 734 insertions, 0 deletions

diff --git a/arch/arm/mach-mxs/clock-mx28.c b/arch/arm/mach-mxs/clock-mx28.c
new file mode 100644
index 00000000000..74e2103c601
--- /dev/null
+++ b/arch/arm/mach-mxs/clock-mx28.c
@@ -0,0 +1,734 @@
+/*
+ * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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/mm.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+
+#include <asm/clkdev.h>
+#include <asm/div64.h>
+
+#include <mach/mx28.h>
+#include <mach/common.h>
+#include <mach/clock.h>
+
+#include "regs-clkctrl-mx28.h"
+
+#define CLKCTRL_BASE_ADDR	MX28_IO_ADDRESS(MX28_CLKCTRL_BASE_ADDR)
+#define DIGCTRL_BASE_ADDR	MX28_IO_ADDRESS(MX28_DIGCTL_BASE_ADDR)
+
+#define PARENT_RATE_SHIFT	8
+
+static struct clk pll2_clk;
+static struct clk cpu_clk;
+static struct clk emi_clk;
+static struct clk saif0_clk;
+static struct clk saif1_clk;
+static struct clk clk32k_clk;
+
+static int _raw_clk_enable(struct clk *clk)
+{
+	u32 reg;
+
+	if (clk->enable_reg) {
+		reg = __raw_readl(clk->enable_reg);
+		reg &= ~(1 << clk->enable_shift);
+		__raw_writel(reg, clk->enable_reg);
+	}
+
+	return 0;
+}
+
+static void _raw_clk_disable(struct clk *clk)
+{
+	u32 reg;
+
+	if (clk->enable_reg) {
+		reg = __raw_readl(clk->enable_reg);
+		reg |= 1 << clk->enable_shift;
+		__raw_writel(reg, clk->enable_reg);
+	}
+}
+
+/*
+ * ref_xtal_clk
+ */
+static unsigned long ref_xtal_clk_get_rate(struct clk *clk)
+{
+	return 24000000;
+}
+
+static struct clk ref_xtal_clk = {
+	.get_rate = ref_xtal_clk_get_rate,
+};
+
+/*
+ * pll_clk
+ */
+static unsigned long pll0_clk_get_rate(struct clk *clk)
+{
+	return 480000000;
+}
+
+static unsigned long pll1_clk_get_rate(struct clk *clk)
+{
+	return 480000000;
+}
+
+static unsigned long pll2_clk_get_rate(struct clk *clk)
+{
+	return 50000000;
+}
+
+#define _CLK_ENABLE_PLL(name, r, g)					\
+static int name##_enable(struct clk *clk)				\
+{									\
+	__raw_writel(BM_CLKCTRL_##r##CTRL0_POWER,			\
+		     CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET);	\
+	udelay(10);							\
+									\
+	if (clk == &pll2_clk)						\
+		__raw_writel(BM_CLKCTRL_##r##CTRL0_##g,			\
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR);	\
+	else								\
+		__raw_writel(BM_CLKCTRL_##r##CTRL0_##g,			\
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET);	\
+									\
+	return 0;							\
+}
+
+_CLK_ENABLE_PLL(pll0_clk, PLL0, EN_USB_CLKS)
+_CLK_ENABLE_PLL(pll1_clk, PLL1, EN_USB_CLKS)
+_CLK_ENABLE_PLL(pll2_clk, PLL2, CLKGATE)
+
+#define _CLK_DISABLE_PLL(name, r, g)					\
+static void name##_disable(struct clk *clk)				\
+{									\
+	__raw_writel(BM_CLKCTRL_##r##CTRL0_POWER,			\
+		     CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR);	\
+									\
+	if (clk == &pll2_clk)						\
+		__raw_writel(BM_CLKCTRL_##r##CTRL0_##g,			\
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET);	\
+	else								\
+		__raw_writel(BM_CLKCTRL_##r##CTRL0_##g,			\
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR);	\
+									\
+}
+
+_CLK_DISABLE_PLL(pll0_clk, PLL0, EN_USB_CLKS)
+_CLK_DISABLE_PLL(pll1_clk, PLL1, EN_USB_CLKS)
+_CLK_DISABLE_PLL(pll2_clk, PLL2, CLKGATE)
+
+#define _DEFINE_CLOCK_PLL(name)						\
+	static struct clk name = {					\
+		.get_rate	= name##_get_rate,			\
+		.enable		= name##_enable,			\
+		.disable	= name##_disable,			\
+		.parent		= &ref_xtal_clk,			\
+	}
+
+_DEFINE_CLOCK_PLL(pll0_clk);
+_DEFINE_CLOCK_PLL(pll1_clk);
+_DEFINE_CLOCK_PLL(pll2_clk);
+
+/*
+ * ref_clk
+ */
+#define _CLK_GET_RATE_REF(name, sr, ss)					\
+static unsigned long name##_get_rate(struct clk *clk)			\
+{									\
+	unsigned long parent_rate;					\
+	u32 reg, div;							\
+									\
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##sr);		\
+	div = (reg >> BP_CLKCTRL_##sr##_##ss##FRAC) & 0x3f;		\
+	parent_rate = clk_get_rate(clk->parent);			\
+									\
+	return SH_DIV((parent_rate >> PARENT_RATE_SHIFT) * 18,		\
+			div, PARENT_RATE_SHIFT);			\
+}
+
+_CLK_GET_RATE_REF(ref_cpu_clk, FRAC0, CPU)
+_CLK_GET_RATE_REF(ref_emi_clk, FRAC0, EMI)
+_CLK_GET_RATE_REF(ref_io0_clk, FRAC0, IO0)
+_CLK_GET_RATE_REF(ref_io1_clk, FRAC0, IO1)
+_CLK_GET_RATE_REF(ref_pix_clk, FRAC1, PIX)
+_CLK_GET_RATE_REF(ref_gpmi_clk, FRAC1, GPMI)
+
+#define _DEFINE_CLOCK_REF(name, er, es)					\
+	static struct clk name = {					\
+		.enable_reg	= CLKCTRL_BASE_ADDR + HW_CLKCTRL_##er,	\
+		.enable_shift	= BP_CLKCTRL_##er##_CLKGATE##es,	\
+		.get_rate	= name##_get_rate,			\
+		.enable		= _raw_clk_enable,			\
+		.disable	= _raw_clk_disable,			\
+		.parent		= &pll0_clk,				\
+	}
+
+_DEFINE_CLOCK_REF(ref_cpu_clk, FRAC0, CPU);
+_DEFINE_CLOCK_REF(ref_emi_clk, FRAC0, EMI);
+_DEFINE_CLOCK_REF(ref_io0_clk, FRAC0, IO0);
+_DEFINE_CLOCK_REF(ref_io1_clk, FRAC0, IO1);
+_DEFINE_CLOCK_REF(ref_pix_clk, FRAC1, PIX);
+_DEFINE_CLOCK_REF(ref_gpmi_clk, FRAC1, GPMI);
+
+/*
+ * General clocks
+ *
+ * clk_get_rate
+ */
+static unsigned long lradc_clk_get_rate(struct clk *clk)
+{
+	return clk_get_rate(clk->parent) / 16;
+}
+
+static unsigned long rtc_clk_get_rate(struct clk *clk)
+{
+	/* ref_xtal_clk is implemented as the only parent */
+	return clk_get_rate(clk->parent) / 768;
+}
+
+static unsigned long clk32k_clk_get_rate(struct clk *clk)
+{
+	return clk->parent->get_rate(clk->parent) / 750;
+}
+
+static unsigned long spdif_clk_get_rate(struct clk *clk)
+{
+	return clk_get_rate(clk->parent) / 4;
+}
+
+#define _CLK_GET_RATE(name, rs)						\
+static unsigned long name##_get_rate(struct clk *clk)			\
+{									\
+	u32 reg, div;							\
+									\
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs);		\
+									\
+	if (clk->parent == &ref_xtal_clk)				\
+		div = (reg & BM_CLKCTRL_##rs##_DIV_XTAL) >>		\
+			BP_CLKCTRL_##rs##_DIV_XTAL;			\
+	else								\
+		div = (reg & BM_CLKCTRL_##rs##_DIV_##rs) >>		\
+			BP_CLKCTRL_##rs##_DIV_##rs;			\
+									\
+	if (!div)							\
+		return -EINVAL;						\
+									\
+	return clk_get_rate(clk->parent) / div;				\
+}
+
+_CLK_GET_RATE(cpu_clk, CPU)
+_CLK_GET_RATE(emi_clk, EMI)
+
+#define _CLK_GET_RATE1(name, rs)					\
+static unsigned long name##_get_rate(struct clk *clk)			\
+{									\
+	u32 reg, div;							\
+									\
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs);		\
+	div = (reg & BM_CLKCTRL_##rs##_DIV) >> BP_CLKCTRL_##rs##_DIV;	\
+									\
+	if (!div)							\
+		return -EINVAL;						\
+									\
+	if (clk == &saif0_clk || clk == &saif1_clk)			\
+		return clk_get_rate(clk->parent) >> 16 * div;		\
+	else								\
+		return clk_get_rate(clk->parent) / div;			\
+}
+
+_CLK_GET_RATE1(hbus_clk, HBUS)
+_CLK_GET_RATE1(xbus_clk, XBUS)
+_CLK_GET_RATE1(ssp0_clk, SSP0)
+_CLK_GET_RATE1(ssp1_clk, SSP1)
+_CLK_GET_RATE1(ssp2_clk, SSP2)
+_CLK_GET_RATE1(ssp3_clk, SSP3)
+_CLK_GET_RATE1(gpmi_clk, GPMI)
+_CLK_GET_RATE1(lcdif_clk, DIS_LCDIF)
+_CLK_GET_RATE1(saif0_clk, SAIF0)
+_CLK_GET_RATE1(saif1_clk, SAIF1)
+
+#define _CLK_GET_RATE_STUB(name)					\
+static unsigned long name##_get_rate(struct clk *clk)			\
+{									\
+	return clk_get_rate(clk->parent);				\
+}
+
+_CLK_GET_RATE_STUB(uart_clk)
+_CLK_GET_RATE_STUB(pwm_clk)
+_CLK_GET_RATE_STUB(can0_clk)
+_CLK_GET_RATE_STUB(can1_clk)
+_CLK_GET_RATE_STUB(fec_clk)
+
+/*
+ * clk_set_rate
+ */
+/* fool compiler */
+#define BM_CLKCTRL_CPU_DIV	0
+#define BP_CLKCTRL_CPU_DIV	0
+#define BM_CLKCTRL_CPU_BUSY	0
+
+#define _CLK_SET_RATE(name, dr, fr, fs)					\
+static int name##_set_rate(struct clk *clk, unsigned long rate)		\
+{									\
+	u32 reg, bm_busy, div_max, d, f, div, frac;			\
+	unsigned long diff, parent_rate, calc_rate;			\
+	int i;								\
+									\
+	parent_rate = clk_get_rate(clk->parent);			\
+	div_max = BM_CLKCTRL_##dr##_DIV >> BP_CLKCTRL_##dr##_DIV;	\
+	bm_busy = BM_CLKCTRL_##dr##_BUSY;				\
+									\
+	if (clk->parent == &ref_xtal_clk) {				\
+		div = DIV_ROUND_UP(parent_rate, rate);			\
+		if (clk == &cpu_clk) {					\
+			div_max = BM_CLKCTRL_CPU_DIV_XTAL >>		\
+				BP_CLKCTRL_CPU_DIV_XTAL;		\
+			bm_busy = BM_CLKCTRL_CPU_BUSY_REF_XTAL;		\
+		}							\
+		if (div == 0 || div > div_max)				\
+			return -EINVAL;					\
+	} else {							\
+		rate >>= PARENT_RATE_SHIFT;				\
+		parent_rate >>= PARENT_RATE_SHIFT;			\
+		diff = parent_rate;					\
+		div = frac = 1;						\
+		if (clk == &cpu_clk) {					\
+			div_max = BM_CLKCTRL_CPU_DIV_CPU >>		\
+				BP_CLKCTRL_CPU_DIV_CPU;			\
+			bm_busy = BM_CLKCTRL_CPU_BUSY_REF_CPU;		\
+		}							\
+		for (d = 1; d <= div_max; d++) {			\
+			f = parent_rate * 18 / d / rate;		\
+			if ((parent_rate * 18 / d) % rate)		\
+				f++;					\
+			if (f < 18 || f > 35)				\
+				continue;				\
+									\
+			calc_rate = parent_rate * 18 / f / d;		\
+			if (calc_rate > rate)				\
+				continue;				\
+									\
+			if (rate - calc_rate < diff) {			\
+				frac = f;				\
+				div = d;				\
+				diff = rate - calc_rate;		\
+			}						\
+									\
+			if (diff == 0)					\
+				break;					\
+		}							\
+									\
+		if (diff == parent_rate)				\
+			return -EINVAL;					\
+									\
+		reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##fr);	\
+		reg &= ~BM_CLKCTRL_##fr##_##fs##FRAC;			\
+		reg |= frac;						\
+		__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##fr);	\
+	}								\
+									\
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr);		\
+	if (clk == &cpu_clk) {						\
+		reg &= ~BM_CLKCTRL_CPU_DIV_CPU;				\
+		reg |= div << BP_CLKCTRL_CPU_DIV_CPU;			\
+	} else {							\
+		reg &= ~BM_CLKCTRL_##dr##_DIV;				\
+		reg |= div << BP_CLKCTRL_##dr##_DIV;			\
+		if (reg | (1 << clk->enable_shift)) {			\
+			pr_err("%s: clock is gated\n", __func__);	\
+			return -EINVAL;					\
+		}							\
+	}								\
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU);		\
+									\
+	for (i = 10000; i; i--)						\
+		if (!(__raw_readl(CLKCTRL_BASE_ADDR +			\
+			HW_CLKCTRL_##dr) & bm_busy))			\
+			break;						\
+	if (!i)	{							\
+		pr_err("%s: divider writing timeout\n", __func__);	\
+		return -ETIMEDOUT;					\
+	}								\
+									\
+	return 0;							\
+}
+
+_CLK_SET_RATE(cpu_clk, CPU, FRAC0, CPU)
+_CLK_SET_RATE(ssp0_clk, SSP0, FRAC0, IO0)
+_CLK_SET_RATE(ssp1_clk, SSP1, FRAC0, IO0)
+_CLK_SET_RATE(ssp2_clk, SSP2, FRAC0, IO1)
+_CLK_SET_RATE(ssp3_clk, SSP3, FRAC0, IO1)
+_CLK_SET_RATE(lcdif_clk, DIS_LCDIF, FRAC1, PIX)
+_CLK_SET_RATE(gpmi_clk, GPMI, FRAC1, GPMI)
+
+#define _CLK_SET_RATE1(name, dr)					\
+static int name##_set_rate(struct clk *clk, unsigned long rate)		\
+{									\
+	u32 reg, div_max, div;						\
+	unsigned long parent_rate;					\
+	int i;								\
+									\
+	parent_rate = clk_get_rate(clk->parent);			\
+	div_max = BM_CLKCTRL_##dr##_DIV >> BP_CLKCTRL_##dr##_DIV;	\
+									\
+	div = DIV_ROUND_UP(parent_rate, rate);				\
+	if (div == 0 || div > div_max)					\
+		return -EINVAL;						\
+									\
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr);		\
+	reg &= ~BM_CLKCTRL_##dr##_DIV;					\
+	reg |= div << BP_CLKCTRL_##dr##_DIV;				\
+	if (reg | (1 << clk->enable_shift)) {				\
+		pr_err("%s: clock is gated\n", __func__);		\
+		return -EINVAL;						\
+	}								\
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr);		\
+									\
+	for (i = 10000; i; i--)						\
+		if (!(__raw_readl(CLKCTRL_BASE_ADDR +			\
+			HW_CLKCTRL_##dr) & BM_CLKCTRL_##dr##_BUSY))	\
+			break;						\
+	if (!i)	{							\
+		pr_err("%s: divider writing timeout\n", __func__);	\
+		return -ETIMEDOUT;					\
+	}								\
+									\
+	return 0;							\
+}
+
+_CLK_SET_RATE1(xbus_clk, XBUS)
+
+/* saif clock uses 16 bits frac div */
+#define _CLK_SET_RATE_SAIF(name, rs)					\
+static int name##_set_rate(struct clk *clk, unsigned long rate)		\
+{									\
+	u16 div;							\
+	u32 reg;							\
+	u64 lrate;							\
+	unsigned long parent_rate;					\
+	int i;								\
+									\
+	parent_rate = clk_get_rate(clk->parent);			\
+	if (rate > parent_rate)						\
+		return -EINVAL;						\
+									\
+	lrate = (u64)rate << 16;					\
+	do_div(lrate, parent_rate);					\
+	div = (u16)lrate;						\
+									\
+	if (!div)							\
+		return -EINVAL;						\
+									\
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs);		\
+	reg &= ~BM_CLKCTRL_##rs##_DIV;					\
+	reg |= div << BP_CLKCTRL_##rs##_DIV;				\
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs);		\
+									\
+	for (i = 10000; i; i--)						\
+		if (!(__raw_readl(CLKCTRL_BASE_ADDR +			\
+			HW_CLKCTRL_##rs) & BM_CLKCTRL_##rs##_BUSY))	\
+			break;						\
+	if (!i) {							\
+		pr_err("%s: divider writing timeout\n", __func__);	\
+		return -ETIMEDOUT;					\
+	}								\
+									\
+	return 0;							\
+}
+
+_CLK_SET_RATE_SAIF(saif0_clk, SAIF0)
+_CLK_SET_RATE_SAIF(saif1_clk, SAIF1)
+
+#define _CLK_SET_RATE_STUB(name)					\
+static int name##_set_rate(struct clk *clk, unsigned long rate)		\
+{									\
+	return -EINVAL;							\
+}
+
+_CLK_SET_RATE_STUB(emi_clk)
+_CLK_SET_RATE_STUB(uart_clk)
+_CLK_SET_RATE_STUB(pwm_clk)
+_CLK_SET_RATE_STUB(spdif_clk)
+_CLK_SET_RATE_STUB(clk32k_clk)
+_CLK_SET_RATE_STUB(can0_clk)
+_CLK_SET_RATE_STUB(can1_clk)
+_CLK_SET_RATE_STUB(fec_clk)
+
+/*
+ * clk_set_parent
+ */
+#define _CLK_SET_PARENT(name, bit)					\
+static int name##_set_parent(struct clk *clk, struct clk *parent)	\
+{									\
+	if (parent != clk->parent) {					\
+		__raw_writel(BM_CLKCTRL_CLKSEQ_BYPASS_##bit,		\
+			 HW_CLKCTRL_CLKSEQ_TOG);			\
+		clk->parent = parent;					\
+	}								\
+									\
+	return 0;							\
+}
+
+_CLK_SET_PARENT(cpu_clk, CPU)
+_CLK_SET_PARENT(emi_clk, EMI)
+_CLK_SET_PARENT(ssp0_clk, SSP0)
+_CLK_SET_PARENT(ssp1_clk, SSP1)
+_CLK_SET_PARENT(ssp2_clk, SSP2)
+_CLK_SET_PARENT(ssp3_clk, SSP3)
+_CLK_SET_PARENT(lcdif_clk, DIS_LCDIF)
+_CLK_SET_PARENT(gpmi_clk, GPMI)
+_CLK_SET_PARENT(saif0_clk, SAIF0)
+_CLK_SET_PARENT(saif1_clk, SAIF1)
+
+#define _CLK_SET_PARENT_STUB(name)					\
+static int name##_set_parent(struct clk *clk, struct clk *parent)	\
+{									\
+	if (parent != clk->parent)					\
+		return -EINVAL;						\
+	else								\
+		return 0;						\
+}
+
+_CLK_SET_PARENT_STUB(pwm_clk)
+_CLK_SET_PARENT_STUB(uart_clk)
+_CLK_SET_PARENT_STUB(clk32k_clk)
+_CLK_SET_PARENT_STUB(spdif_clk)
+_CLK_SET_PARENT_STUB(fec_clk)
+_CLK_SET_PARENT_STUB(can0_clk)
+_CLK_SET_PARENT_STUB(can1_clk)
+
+/*
+ * clk definition
+ */
+static struct clk cpu_clk = {
+	.get_rate = cpu_clk_get_rate,
+	.set_rate = cpu_clk_set_rate,
+	.set_parent = cpu_clk_set_parent,
+	.parent = &ref_cpu_clk,
+};
+
+static struct clk hbus_clk = {
+	.get_rate = hbus_clk_get_rate,
+	.parent = &cpu_clk,
+};
+
+static struct clk xbus_clk = {
+	.get_rate = xbus_clk_get_rate,
+	.set_rate = xbus_clk_set_rate,
+	.parent = &ref_xtal_clk,
+};
+
+static struct clk lradc_clk = {
+	.get_rate = lradc_clk_get_rate,
+	.parent = &clk32k_clk,
+};
+
+static struct clk rtc_clk = {
+	.get_rate = rtc_clk_get_rate,
+	.parent = &ref_xtal_clk,
+};
+
+/* usb_clk gate is controlled in DIGCTRL other than CLKCTRL */
+static struct clk usb0_clk = {
+	.enable_reg = DIGCTRL_BASE_ADDR,
+	.enable_shift = 2,
+	.enable = _raw_clk_enable,
+	.disable = _raw_clk_disable,
+	.parent = &pll0_clk,
+};
+
+static struct clk usb1_clk = {
+	.enable_reg = DIGCTRL_BASE_ADDR,
+	.enable_shift = 16,
+	.enable = _raw_clk_enable,
+	.disable = _raw_clk_disable,
+	.parent = &pll1_clk,
+};
+
+#define _DEFINE_CLOCK(name, er, es, p)					\
+	static struct clk name = {					\
+		.enable_reg	= CLKCTRL_BASE_ADDR + HW_CLKCTRL_##er,	\
+		.enable_shift	= BP_CLKCTRL_##er##_##es,		\
+		.get_rate	= name##_get_rate,			\
+		.set_rate	= name##_set_rate,			\
+		.set_parent	= name##_set_parent,			\
+		.enable		= _raw_clk_enable,			\
+		.disable	= _raw_clk_disable,			\
+		.parent		= p,					\
+	}
+
+_DEFINE_CLOCK(emi_clk, EMI, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(ssp0_clk, SSP0, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(ssp1_clk, SSP1, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(ssp2_clk, SSP2, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(ssp3_clk, SSP3, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(lcdif_clk, DIS_LCDIF, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(gpmi_clk, GPMI, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(saif0_clk, SAIF0, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(saif1_clk, SAIF1, CLKGATE, &ref_xtal_clk);
+_DEFINE_CLOCK(can0_clk, FLEXCAN, STOP_CAN0, &ref_xtal_clk);
+_DEFINE_CLOCK(can1_clk, FLEXCAN, STOP_CAN1, &ref_xtal_clk);
+_DEFINE_CLOCK(pwm_clk, XTAL, PWM_CLK24M_GATE, &ref_xtal_clk);
+_DEFINE_CLOCK(uart_clk, XTAL, UART_CLK_GATE, &ref_xtal_clk);
+_DEFINE_CLOCK(clk32k_clk, XTAL, TIMROT_CLK32K_GATE, &ref_xtal_clk);
+_DEFINE_CLOCK(spdif_clk, SPDIF, CLKGATE, &pll0_clk);
+_DEFINE_CLOCK(fec_clk, ENET, DISABLE, &hbus_clk);
+
+#define _REGISTER_CLOCK(d, n, c) \
+	{ \
+		.dev_id = d, \
+		.con_id = n, \
+		.clk = &c, \
+	},
+
+static struct clk_lookup lookups[] = {
+	_REGISTER_CLOCK("mxs-duart.0", NULL, uart_clk)
+	_REGISTER_CLOCK("fec.0", NULL, fec_clk)
+	_REGISTER_CLOCK("rtc", NULL, rtc_clk)
+	_REGISTER_CLOCK("pll2", NULL, pll2_clk)
+	_REGISTER_CLOCK(NULL, "hclk", hbus_clk)
+	_REGISTER_CLOCK(NULL, "xclk", xbus_clk)
+	_REGISTER_CLOCK(NULL, "can0", can0_clk)
+	_REGISTER_CLOCK(NULL, "can1", can1_clk)
+	_REGISTER_CLOCK(NULL, "usb0", usb0_clk)
+	_REGISTER_CLOCK(NULL, "usb1", usb1_clk)
+	_REGISTER_CLOCK(NULL, "pwm", pwm_clk)
+	_REGISTER_CLOCK(NULL, "lradc", lradc_clk)
+	_REGISTER_CLOCK(NULL, "spdif", spdif_clk)
+};
+
+static int clk_misc_init(void)
+{
+	u32 reg;
+	int i;
+
+	/* Fix up parent per register setting */
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_CLKSEQ);
+	cpu_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_CPU) ?
+			&ref_xtal_clk : &ref_cpu_clk;
+	emi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_EMI) ?
+			&ref_xtal_clk : &ref_emi_clk;
+	ssp0_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP0) ?
+			&ref_xtal_clk : &ref_io0_clk;
+	ssp1_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP1) ?
+			&ref_xtal_clk : &ref_io0_clk;
+	ssp2_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP2) ?
+			&ref_xtal_clk : &ref_io1_clk;
+	ssp3_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP3) ?
+			&ref_xtal_clk : &ref_io1_clk;
+	lcdif_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_DIS_LCDIF) ?
+			&ref_xtal_clk : &ref_pix_clk;
+	gpmi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_GPMI) ?
+			&ref_xtal_clk : &ref_gpmi_clk;
+	saif0_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SAIF0) ?
+			&ref_xtal_clk : &pll0_clk;
+	saif1_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SAIF1) ?
+			&ref_xtal_clk : &pll0_clk;
+
+	/* Use int div over frac when both are available */
+	__raw_writel(BM_CLKCTRL_CPU_DIV_XTAL_FRAC_EN,
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_CLR);
+	__raw_writel(BM_CLKCTRL_CPU_DIV_CPU_FRAC_EN,
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_CLR);
+	__raw_writel(BM_CLKCTRL_HBUS_DIV_FRAC_EN,
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS_CLR);
+
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_XBUS);
+	reg &= ~BM_CLKCTRL_XBUS_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_XBUS);
+
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP0);
+	reg &= ~BM_CLKCTRL_SSP0_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP0);
+
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP1);
+	reg &= ~BM_CLKCTRL_SSP1_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP1);
+
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP2);
+	reg &= ~BM_CLKCTRL_SSP2_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP2);
+
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP3);
+	reg &= ~BM_CLKCTRL_SSP3_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP3);
+
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_GPMI);
+	reg &= ~BM_CLKCTRL_GPMI_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_GPMI);
+
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_DIS_LCDIF);
+	reg &= ~BM_CLKCTRL_DIS_LCDIF_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_DIS_LCDIF);
+
+	/* SAIF has to use frac div for functional operation */
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF0);
+	reg &= ~BM_CLKCTRL_SAIF0_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF0);
+
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF1);
+	reg &= ~BM_CLKCTRL_SAIF1_DIV_FRAC_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF1);
+
+	/*
+	 * Set safe hbus clock divider. A divider of 3 ensure that
+	 * the Vddd voltage required for the cpu clock is sufficiently
+	 * high for the hbus clock.
+	 */
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS);
+	reg &= BM_CLKCTRL_HBUS_DIV;
+	reg |= 3 << BP_CLKCTRL_HBUS_DIV;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS);
+
+	for (i = 10000; i; i--)
+		if (!(__raw_readl(CLKCTRL_BASE_ADDR +
+			HW_CLKCTRL_HBUS) & BM_CLKCTRL_HBUS_ASM_BUSY))
+			break;
+	if (!i) {
+		pr_err("%s: divider writing timeout\n", __func__);
+		return -ETIMEDOUT;
+	}
+
+	/* Gate off cpu clock in WFI for power saving */
+	__raw_writel(BM_CLKCTRL_CPU_INTERRUPT_WAIT,
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_SET);
+
+	/* Extra fec clock setting */
+	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
+	reg &= ~BM_CLKCTRL_ENET_SLEEP;
+	reg |= BM_CLKCTRL_ENET_CLK_OUT_EN;
+	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
+
+	return 0;
+}
+
+int __init mx28_clocks_init(void)
+{
+	clk_misc_init();
+
+	clkdev_add_table(lookups, ARRAY_SIZE(lookups));
+
+	mxs_timer_init(&clk32k_clk, MX28_INT_TIMER0);
+
+	return 0;
+}