ARM: mxs: remove old clock support

/*

 * 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 <linux/clkdev.h>

#include <asm/clkdev.h>

#include <asm/div64.h>

#include <mach/mx23.h>

#include <mach/common.h>

#include <mach/clock.h>

#include "regs-clkctrl-mx23.h"

#define CLKCTRL_BASE_ADDR	MX23_IO_ADDRESS(MX23_CLKCTRL_BASE_ADDR)

#define DIGCTRL_BASE_ADDR	MX23_IO_ADDRESS(MX23_DIGCTL_BASE_ADDR)

#define PARENT_RATE_SHIFT	8

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 pll_clk_get_rate(struct clk *clk)

{

	return 480000000;

}

static int pll_clk_enable(struct clk *clk)

{

	__raw_writel(BM_CLKCTRL_PLLCTRL0_POWER |

			BM_CLKCTRL_PLLCTRL0_EN_USB_CLKS,

			CLKCTRL_BASE_ADDR + HW_CLKCTRL_PLLCTRL0_SET);

	/* Only a 10us delay is need. PLLCTRL1 LOCK bitfied is only a timer

	 * and is incorrect (excessive). Per definition of the PLLCTRL0

	 * POWER field, waiting at least 10us.

	 */

	udelay(10);

	return 0;

}

static void pll_clk_disable(struct clk *clk)

{

	__raw_writel(BM_CLKCTRL_PLLCTRL0_POWER |

			BM_CLKCTRL_PLLCTRL0_EN_USB_CLKS,

			CLKCTRL_BASE_ADDR + HW_CLKCTRL_PLLCTRL0_CLR);

}

static struct clk pll_clk = {

	 .get_rate = pll_clk_get_rate,

	 .enable = pll_clk_enable,

	 .disable = pll_clk_disable,

	 .parent = &ref_xtal_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, FRAC, CPU)

_CLK_GET_RATE_REF(ref_emi_clk, FRAC, EMI)

_CLK_GET_RATE_REF(ref_pix_clk, FRAC, PIX)

_CLK_GET_RATE_REF(ref_io_clk, FRAC, IO)

#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		= &pll_clk,				\

	}

_DEFINE_CLOCK_REF(ref_cpu_clk, FRAC, CPU);

_DEFINE_CLOCK_REF(ref_emi_clk, FRAC, EMI);

_DEFINE_CLOCK_REF(ref_pix_clk, FRAC, PIX);

_DEFINE_CLOCK_REF(ref_io_clk, FRAC, IO);

/*

 * General clocks

 *

 * clk_get_rate

 */

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;

}

#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;						\

									\

	return clk_get_rate(clk->parent) / div;				\

}

_CLK_GET_RATE1(hbus_clk, HBUS)

_CLK_GET_RATE1(xbus_clk, XBUS)

_CLK_GET_RATE1(ssp_clk, SSP)

_CLK_GET_RATE1(gpmi_clk, GPMI)

_CLK_GET_RATE1(lcdif_clk, PIX)

#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(audio_clk)

_CLK_GET_RATE_STUB(pwm_clk)

/*

 * clk_set_rate

 */

static int cpu_clk_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;

	parent_rate = clk_get_rate(clk->parent);

	if (clk->parent == &ref_xtal_clk) {

		div_max = BM_CLKCTRL_CPU_DIV_XTAL >> BP_CLKCTRL_CPU_DIV_XTAL;

		bm_busy = BM_CLKCTRL_CPU_BUSY_REF_XTAL;

		div = DIV_ROUND_UP(parent_rate, rate);

		if (div == 0 || div > div_max)

			return -EINVAL;

	} else {

		div_max = BM_CLKCTRL_CPU_DIV_CPU >> BP_CLKCTRL_CPU_DIV_CPU;

		bm_busy = BM_CLKCTRL_CPU_BUSY_REF_CPU;

		rate >>= PARENT_RATE_SHIFT;

		parent_rate >>= PARENT_RATE_SHIFT;

		diff = parent_rate;

		div = frac = 1;

		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_FRAC);

		reg &= ~BM_CLKCTRL_FRAC_CPUFRAC;

		reg |= frac;

		__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC);

	}

	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU);

	reg &= ~BM_CLKCTRL_CPU_DIV_CPU;

	reg |= div << BP_CLKCTRL_CPU_DIV_CPU;

	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU);

	mxs_clkctrl_timeout(HW_CLKCTRL_CPU, bm_busy);

	return 0;

}

#define _CLK_SET_RATE(name, dr)						\

static int name##_set_rate(struct clk *clk, unsigned long rate)		\

{									\

	u32 reg, div_max, div;						\

	unsigned long parent_rate;					\

									\

	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);		\

									\

	mxs_clkctrl_timeout(HW_CLKCTRL_##dr, BM_CLKCTRL_##dr##_BUSY);	\

	return 0;							\

}

_CLK_SET_RATE(xbus_clk, XBUS)

_CLK_SET_RATE(ssp_clk, SSP)

_CLK_SET_RATE(gpmi_clk, GPMI)

_CLK_SET_RATE(lcdif_clk, PIX)

#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(audio_clk)

_CLK_SET_RATE_STUB(pwm_clk)

_CLK_SET_RATE_STUB(clk32k_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,		\

			 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CLKSEQ_TOG);	\

		clk->parent = parent;					\

	}								\

									\

	return 0;							\

}

_CLK_SET_PARENT(cpu_clk, CPU)

_CLK_SET_PARENT(emi_clk, EMI)

_CLK_SET_PARENT(ssp_clk, SSP)

_CLK_SET_PARENT(gpmi_clk, GPMI)

_CLK_SET_PARENT(lcdif_clk, PIX)

#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(uart_clk)

_CLK_SET_PARENT_STUB(audio_clk)

_CLK_SET_PARENT_STUB(pwm_clk)

_CLK_SET_PARENT_STUB(clk32k_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 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 usb_clk = {

	.enable_reg = DIGCTRL_BASE_ADDR,

	.enable_shift = 2,

	.enable = _raw_clk_enable,

	.disable = _raw_clk_disable,

	.parent = &pll_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(ssp_clk, SSP, CLKGATE, &ref_xtal_clk);

_DEFINE_CLOCK(gpmi_clk, GPMI, CLKGATE, &ref_xtal_clk);

_DEFINE_CLOCK(lcdif_clk, PIX, CLKGATE, &ref_xtal_clk);

_DEFINE_CLOCK(uart_clk, XTAL, UART_CLK_GATE, &ref_xtal_clk);

_DEFINE_CLOCK(audio_clk, XTAL, FILT_CLK24M_GATE, &ref_xtal_clk);

_DEFINE_CLOCK(pwm_clk, XTAL, PWM_CLK24M_GATE, &ref_xtal_clk);

_DEFINE_CLOCK(clk32k_clk, XTAL, TIMROT_CLK32K_GATE, &ref_xtal_clk);

#define _REGISTER_CLOCK(d, n, c) \

	{ \

		.dev_id = d, \

		.con_id = n, \

		.clk = &c, \

	},

static struct clk_lookup lookups[] = {

	/* for amba bus driver */

	_REGISTER_CLOCK("duart", "apb_pclk", xbus_clk)

	/* for amba-pl011 driver */

	_REGISTER_CLOCK("duart", NULL, uart_clk)

	_REGISTER_CLOCK("mxs-auart.0", NULL, uart_clk)

	_REGISTER_CLOCK("rtc", NULL, rtc_clk)

	_REGISTER_CLOCK("mxs-dma-apbh", NULL, hbus_clk)

	_REGISTER_CLOCK("mxs-dma-apbx", NULL, xbus_clk)

	_REGISTER_CLOCK("mxs-mmc.0", NULL, ssp_clk)

	_REGISTER_CLOCK("mxs-mmc.1", NULL, ssp_clk)

	_REGISTER_CLOCK(NULL, "usb", usb_clk)

	_REGISTER_CLOCK(NULL, "audio", audio_clk)

	_REGISTER_CLOCK("mxs-pwm.0", NULL, pwm_clk)

	_REGISTER_CLOCK("mxs-pwm.1", NULL, pwm_clk)

	_REGISTER_CLOCK("mxs-pwm.2", NULL, pwm_clk)

	_REGISTER_CLOCK("mxs-pwm.3", NULL, pwm_clk)

	_REGISTER_CLOCK("mxs-pwm.4", NULL, pwm_clk)

	_REGISTER_CLOCK("imx23-fb", NULL, lcdif_clk)

	_REGISTER_CLOCK("imx23-gpmi-nand", NULL, gpmi_clk)

};

static int clk_misc_init(void)

{

	u32 reg;

	int ret;

	/* 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;

	ssp_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP) ?

			&ref_xtal_clk : &ref_io_clk;

	gpmi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_GPMI) ?

			&ref_xtal_clk : &ref_io_clk;

	lcdif_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_PIX) ?

			&ref_xtal_clk : &ref_pix_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_SSP);

	reg &= ~BM_CLKCTRL_SSP_DIV_FRAC_EN;

	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP);

	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_PIX);

	reg &= ~BM_CLKCTRL_PIX_DIV_FRAC_EN;

	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_PIX);

	/*

	 * 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);

	ret = mxs_clkctrl_timeout(HW_CLKCTRL_HBUS, BM_CLKCTRL_HBUS_BUSY);

	/* Gate off cpu clock in WFI for power saving */

	__raw_writel(BM_CLKCTRL_CPU_INTERRUPT_WAIT,

			CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_SET);

	/*

	 * 480 MHz seems too high to be ssp clock source directly,

	 * so set frac to get a 288 MHz ref_io.

	 */

	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC);

	reg &= ~BM_CLKCTRL_FRAC_IOFRAC;

	reg |= 30 << BP_CLKCTRL_FRAC_IOFRAC;

	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC);

	return ret;

}

int __init mx23_clocks_init(void)

{

	clk_misc_init();

	/*

	 * source ssp clock from ref_io than ref_xtal,

	 * as ref_xtal only provides 24 MHz as maximum.

	 */

	clk_set_parent(&ssp_clk, &ref_io_clk);

	clk_prepare_enable(&cpu_clk);

	clk_prepare_enable(&hbus_clk);

	clk_prepare_enable(&xbus_clk);

	clk_prepare_enable(&emi_clk);

	clk_prepare_enable(&uart_clk);

	clkdev_add_table(lookups, ARRAY_SIZE(lookups));

	mxs_timer_init(&clk32k_clk, MX23_INT_TIMER0);

	return 0;

}

/*

 * Based on arch/arm/plat-omap/clock.c

 *

 * Copyright (C) 2004 - 2005 Nokia corporation

 * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>

 * Modified for omap shared clock framework by Tony Lindgren <tony@atomide.com>

 * Copyright 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.

 */

/* #define DEBUG */

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/platform_device.h>

#include <linux/proc_fs.h>

#include <linux/semaphore.h>

#include <linux/string.h>

#include <mach/clock.h>

static LIST_HEAD(clocks);

static DEFINE_MUTEX(clocks_mutex);

/*-------------------------------------------------------------------------

 * Standard clock functions defined in include/linux/clk.h

 *-------------------------------------------------------------------------*/

static void __clk_disable(struct clk *clk)

{

	if (clk == NULL || IS_ERR(clk))

		return;

	WARN_ON(!clk->usecount);

	if (!(--clk->usecount)) {

		if (clk->disable)

			clk->disable(clk);

		__clk_disable(clk->parent);

	}

}

static int __clk_enable(struct clk *clk)

{

	if (clk == NULL || IS_ERR(clk))

		return -EINVAL;

	if (clk->usecount++ == 0) {

		__clk_enable(clk->parent);

		if (clk->enable)

			clk->enable(clk);

	}

	return 0;

}

/*

 * The clk_enable/clk_disable could be called by drivers in atomic context,

 * so they should not really hold mutex.  Instead, clk_prepare/clk_unprepare

 * can hold a mutex, as the pair will only be called in non-atomic context.

 * Before migrating to common clk framework, we can have __clk_enable and

 * __clk_disable called in clk_prepare/clk_unprepare with mutex held and

 * leave clk_enable/clk_disable as the dummy functions.

 */

int clk_prepare(struct clk *clk)

{

	int ret = 0;

	if (clk == NULL || IS_ERR(clk))

		return -EINVAL;

	mutex_lock(&clocks_mutex);

	ret = __clk_enable(clk);

	mutex_unlock(&clocks_mutex);

	return ret;

}

EXPORT_SYMBOL(clk_prepare);

void clk_unprepare(struct clk *clk)

{

	if (clk == NULL || IS_ERR(clk))

		return;

	mutex_lock(&clocks_mutex);

	__clk_disable(clk);

	mutex_unlock(&clocks_mutex);

}

EXPORT_SYMBOL(clk_unprepare);

int clk_enable(struct clk *clk)

{

	return 0;

}

EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)

{

	/* nothing to do */

}

EXPORT_SYMBOL(clk_disable);

/* Retrieve the *current* clock rate. If the clock itself

 * does not provide a special calculation routine, ask

 * its parent and so on, until one is able to return

 * a valid clock rate

 */

unsigned long clk_get_rate(struct clk *clk)

{

	if (clk == NULL || IS_ERR(clk))

		return 0UL;

	if (clk->get_rate)

		return clk->get_rate(clk);

	return clk_get_rate(clk->parent);

}

EXPORT_SYMBOL(clk_get_rate);

/* Round the requested clock rate to the nearest supported

 * rate that is less than or equal to the requested rate.

 * This is dependent on the clock's current parent.

 */

long clk_round_rate(struct clk *clk, unsigned long rate)

{

	if (clk == NULL || IS_ERR(clk) || !clk->round_rate)

		return 0;

	return clk->round_rate(clk, rate);

}

EXPORT_SYMBOL(clk_round_rate);

/* Set the clock to the requested clock rate. The rate must

 * match a supported rate exactly based on what clk_round_rate returns

 */

int clk_set_rate(struct clk *clk, unsigned long rate)

{

	int ret = -EINVAL;

	if (clk == NULL || IS_ERR(clk) || clk->set_rate == NULL || rate == 0)

		return ret;

	mutex_lock(&clocks_mutex);

	ret = clk->set_rate(clk, rate);

	mutex_unlock(&clocks_mutex);

	return ret;

}

EXPORT_SYMBOL(clk_set_rate);

/* Set the clock's parent to another clock source */

int clk_set_parent(struct clk *clk, struct clk *parent)

{

	int ret = -EINVAL;

	struct clk *old;

	if (clk == NULL || IS_ERR(clk) || parent == NULL ||

	    IS_ERR(parent) || clk->set_parent == NULL)

		return ret;

	if (clk->usecount)

		clk_prepare_enable(parent);

	mutex_lock(&clocks_mutex);

	ret = clk->set_parent(clk, parent);

	if (ret == 0) {

		old = clk->parent;

		clk->parent = parent;

	} else {

		old = parent;

	}

	mutex_unlock(&clocks_mutex);

	if (clk->usecount)

		clk_disable(old);

	return ret;

}

EXPORT_SYMBOL(clk_set_parent);

/* Retrieve the clock's parent clock source */

struct clk *clk_get_parent(struct clk *clk)

{

	struct clk *ret = NULL;

	if (clk == NULL || IS_ERR(clk))

		return ret;

	return clk->parent;

}

EXPORT_SYMBOL(clk_get_parent);

/*

 * Copyright 2005-2007 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 __MACH_MXS_CLOCK_H__

#define __MACH_MXS_CLOCK_H__

#ifndef __ASSEMBLY__