arch/arm/mach-omap2/clock34xx.c - maze/linux - Git at Google

 /*
  * OMAP3-specific clock framework functions
  *
  * Copyright (C) 2007-2008 Texas Instruments, Inc.
  * Copyright (C) 2007-2009 Nokia Corporation
  *
  * Written by Paul Walmsley
  * Testing and integration fixes by Jouni Högander
  *
  * Parts of this code are based on code written by
  * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #undef DEBUG

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/list.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/limits.h>
 #include <linux/bitops.h>

 #include <plat/cpu.h>
 #include <plat/clock.h>
 #include <plat/sram.h>
 #include <plat/sdrc.h>
 #include <asm/div64.h>
 #include <asm/clkdev.h>

 #include "clock.h"
 #include "clock34xx.h"
 #include "sdrc.h"
 #include "prm.h"
 #include "prm-regbits-34xx.h"
 #include "cm.h"
 #include "cm-regbits-34xx.h"

 #define CYCLES_PER_MHZ			1000000

 /*
  * DPLL5_FREQ_FOR_USBHOST: USBHOST and USBTLL are the only clocks
  * that are sourced by DPLL5, and both of these require this clock
  * to be at 120 MHz for proper operation.
  */
 #define DPLL5_FREQ_FOR_USBHOST		120000000

 /* needed by omap3_core_dpll_m2_set_rate() */
 struct clk *sdrc_ick_p, *arm_fck_p;

 /**
  * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
  * @clk: struct clk * being enabled
  * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
  * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
  *
  * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
  * from the CM_{I,F}CLKEN bit.  Pass back the correct info via
  * @idlest_reg and @idlest_bit.  No return value.
  */
 static void omap3430es2_clk_ssi_find_idlest(struct clk *clk,
 					    void __iomem **idlest_reg,
 					    u8 *idlest_bit)
 {
 	u32 r;

 	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
 	*idlest_reg = (__force void __iomem *)r;
 	*idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
 }

 const struct clkops clkops_omap3430es2_ssi_wait = {
 	.enable		= omap2_dflt_clk_enable,
 	.disable	= omap2_dflt_clk_disable,
 	.find_idlest	= omap3430es2_clk_ssi_find_idlest,
 	.find_companion = omap2_clk_dflt_find_companion,
 };

 /**
  * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
  * @clk: struct clk * being enabled
  * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
  * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
  *
  * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
  * target IDLEST bits.  For our purposes, we are concerned with the
  * target IDLEST bits, which exist at a different bit position than
  * the *CLKEN bit position for these modules (DSS and USBHOST) (The
  * default find_idlest code assumes that they are at the same
  * position.)  No return value.
  */
 static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk,
 						    void __iomem **idlest_reg,
 						    u8 *idlest_bit)
 {
 	u32 r;

 	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
 	*idlest_reg = (__force void __iomem *)r;
 	/* USBHOST_IDLE has same shift */
 	*idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
 }

 const struct clkops clkops_omap3430es2_dss_usbhost_wait = {
 	.enable		= omap2_dflt_clk_enable,
 	.disable	= omap2_dflt_clk_disable,
 	.find_idlest	= omap3430es2_clk_dss_usbhost_find_idlest,
 	.find_companion = omap2_clk_dflt_find_companion,
 };

 /**
  * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
  * @clk: struct clk * being enabled
  * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
  * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
  *
  * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
  * shift from the CM_{I,F}CLKEN bit.  Pass back the correct info via
  * @idlest_reg and @idlest_bit.  No return value.
  */
 static void omap3430es2_clk_hsotgusb_find_idlest(struct clk *clk,
 						 void __iomem **idlest_reg,
 						 u8 *idlest_bit)
 {
 	u32 r;

 	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
 	*idlest_reg = (__force void __iomem *)r;
 	*idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
 }

 const struct clkops clkops_omap3430es2_hsotgusb_wait = {
 	.enable		= omap2_dflt_clk_enable,
 	.disable	= omap2_dflt_clk_disable,
 	.find_idlest	= omap3430es2_clk_hsotgusb_find_idlest,
 	.find_companion = omap2_clk_dflt_find_companion,
 };

 const struct clkops clkops_noncore_dpll_ops = {
 	.enable		= omap3_noncore_dpll_enable,
 	.disable	= omap3_noncore_dpll_disable,
 };

 int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
 {
 	/*
 	 * According to the 12-5 CDP code from TI, "Limitation 2.5"
 	 * on 3430ES1 prevents us from changing DPLL multipliers or dividers
 	 * on DPLL4.
 	 */
 	if (omap_rev() == OMAP3430_REV_ES1_0) {
 		printk(KERN_ERR "clock: DPLL4 cannot change rate due to "
 		       "silicon 'Limitation 2.5' on 3430ES1.\n");
 		return -EINVAL;
 	}
 	return omap3_noncore_dpll_set_rate(clk, rate);
 }


 /*
  * CORE DPLL (DPLL3) rate programming functions
  *
  * These call into SRAM code to do the actual CM writes, since the SDRAM
  * is clocked from DPLL3.
  */

 /**
  * omap3_core_dpll_m2_set_rate - set CORE DPLL M2 divider
  * @clk: struct clk * of DPLL to set
  * @rate: rounded target rate
  *
  * Program the DPLL M2 divider with the rounded target rate.  Returns
  * -EINVAL upon error, or 0 upon success.
  */
 int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
 {
 	u32 new_div = 0;
 	u32 unlock_dll = 0;
 	u32 c;
 	unsigned long validrate, sdrcrate, _mpurate;
 	struct omap_sdrc_params *sdrc_cs0;
 	struct omap_sdrc_params *sdrc_cs1;
 	int ret;

 	if (!clk || !rate)
 		return -EINVAL;

 	validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
 	if (validrate != rate)
 		return -EINVAL;

 	sdrcrate = sdrc_ick_p->rate;
 	if (rate > clk->rate)
 		sdrcrate <<= ((rate / clk->rate) >> 1);
 	else
 		sdrcrate >>= ((clk->rate / rate) >> 1);

 	ret = omap2_sdrc_get_params(sdrcrate, &sdrc_cs0, &sdrc_cs1);
 	if (ret)
 		return -EINVAL;

 	if (sdrcrate < MIN_SDRC_DLL_LOCK_FREQ) {
 		pr_debug("clock: will unlock SDRC DLL\n");
 		unlock_dll = 1;
 	}

 	/*
 	 * XXX This only needs to be done when the CPU frequency changes
 	 */
 	_mpurate = arm_fck_p->rate / CYCLES_PER_MHZ;
 	c = (_mpurate << SDRC_MPURATE_SCALE) >> SDRC_MPURATE_BASE_SHIFT;
 	c += 1;  /* for safety */
 	c *= SDRC_MPURATE_LOOPS;
 	c >>= SDRC_MPURATE_SCALE;
 	if (c == 0)
 		c = 1;

 	pr_debug("clock: changing CORE DPLL rate from %lu to %lu\n", clk->rate,
 		 validrate);
 	pr_debug("clock: SDRC CS0 timing params used:"
 		 " RFR %08x CTRLA %08x CTRLB %08x MR %08x\n",
 		 sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
 		 sdrc_cs0->actim_ctrlb, sdrc_cs0->mr);
 	if (sdrc_cs1)
 		pr_debug("clock: SDRC CS1 timing params used: "
 		 " RFR %08x CTRLA %08x CTRLB %08x MR %08x\n",
 		 sdrc_cs1->rfr_ctrl, sdrc_cs1->actim_ctrla,
 		 sdrc_cs1->actim_ctrlb, sdrc_cs1->mr);

 	if (sdrc_cs1)
 		omap3_configure_core_dpll(
 				  new_div, unlock_dll, c, rate > clk->rate,
 				  sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
 				  sdrc_cs0->actim_ctrlb, sdrc_cs0->mr,
 				  sdrc_cs1->rfr_ctrl, sdrc_cs1->actim_ctrla,
 				  sdrc_cs1->actim_ctrlb, sdrc_cs1->mr);
 	else
 		omap3_configure_core_dpll(
 				  new_div, unlock_dll, c, rate > clk->rate,
 				  sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
 				  sdrc_cs0->actim_ctrlb, sdrc_cs0->mr,
 				  0, 0, 0, 0);

 	return 0;
 }

 /* Common clock code */

 /*
  * As it is structured now, this will prevent an OMAP2/3 multiboot
  * kernel from compiling.  This will need further attention.
  */
 #if defined(CONFIG_ARCH_OMAP3)

 struct clk_functions omap2_clk_functions = {
 	.clk_enable		= omap2_clk_enable,
 	.clk_disable		= omap2_clk_disable,
 	.clk_round_rate		= omap2_clk_round_rate,
 	.clk_set_rate		= omap2_clk_set_rate,
 	.clk_set_parent		= omap2_clk_set_parent,
 	.clk_disable_unused	= omap2_clk_disable_unused,
 };

 /*
  * Set clocks for bypass mode for reboot to work.
  */
 void omap2_clk_prepare_for_reboot(void)
 {
 	/* REVISIT: Not ready for 343x */
 #if 0
 	u32 rate;

 	if (vclk == NULL || sclk == NULL)
 		return;

 	rate = clk_get_rate(sclk);
 	clk_set_rate(vclk, rate);
 #endif
 }

 void omap3_clk_lock_dpll5(void)
 {
 	struct clk *dpll5_clk;
 	struct clk *dpll5_m2_clk;

 	dpll5_clk = clk_get(NULL, "dpll5_ck");
 	clk_set_rate(dpll5_clk, DPLL5_FREQ_FOR_USBHOST);
 	clk_enable(dpll5_clk);

 	/* Enable autoidle to allow it to enter low power bypass */
 	omap3_dpll_allow_idle(dpll5_clk);

 	/* Program dpll5_m2_clk divider for no division */
 	dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck");
 	clk_enable(dpll5_m2_clk);
 	clk_set_rate(dpll5_m2_clk, DPLL5_FREQ_FOR_USBHOST);

 	clk_disable(dpll5_m2_clk);
 	clk_disable(dpll5_clk);
 	return;
 }

 /* REVISIT: Move this init stuff out into clock.c */

 /*
  * Switch the MPU rate if specified on cmdline.
  * We cannot do this early until cmdline is parsed.
  */
 static int __init omap2_clk_arch_init(void)
 {
 	struct clk *osc_sys_ck, *dpll1_ck, *arm_fck, *core_ck;
 	unsigned long osc_sys_rate;

 	if (!mpurate)
 		return -EINVAL;

 	/* XXX test these for success */
 	dpll1_ck = clk_get(NULL, "dpll1_ck");
 	arm_fck = clk_get(NULL, "arm_fck");
 	core_ck = clk_get(NULL, "core_ck");
 	osc_sys_ck = clk_get(NULL, "osc_sys_ck");

 	/* REVISIT: not yet ready for 343x */
 	if (clk_set_rate(dpll1_ck, mpurate))
 		printk(KERN_ERR "*** Unable to set MPU rate\n");

 	recalculate_root_clocks();

 	osc_sys_rate = clk_get_rate(osc_sys_ck);

 	pr_info("Switched to new clocking rate (Crystal/Core/MPU): "
 		"%ld.%01ld/%ld/%ld MHz\n",
 		(osc_sys_rate / 1000000),
 		((osc_sys_rate / 100000) % 10),
 		(clk_get_rate(core_ck) / 1000000),
 		(clk_get_rate(arm_fck) / 1000000));

 	calibrate_delay();

 	return 0;
 }
 arch_initcall(omap2_clk_arch_init);


 #endif
	/*
	* OMAP3-specific clock framework functions
	*
	* Copyright (C) 2007-2008 Texas Instruments, Inc.
	* Copyright (C) 2007-2009 Nokia Corporation
	*
	* Written by Paul Walmsley
	* Testing and integration fixes by Jouni Högander
	*
	* Parts of this code are based on code written by
	* Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#undef DEBUG

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <linux/list.h>
	#include <linux/errno.h>
	#include <linux/delay.h>
	#include <linux/clk.h>
	#include <linux/io.h>
	#include <linux/limits.h>
	#include <linux/bitops.h>

	#include <plat/cpu.h>
	#include <plat/clock.h>
	#include <plat/sram.h>
	#include <plat/sdrc.h>
	#include <asm/div64.h>
	#include <asm/clkdev.h>

	#include "clock.h"
	#include "clock34xx.h"
	#include "sdrc.h"
	#include "prm.h"
	#include "prm-regbits-34xx.h"
	#include "cm.h"
	#include "cm-regbits-34xx.h"

	#define CYCLES_PER_MHZ 1000000

	/*
	* DPLL5_FREQ_FOR_USBHOST: USBHOST and USBTLL are the only clocks
	* that are sourced by DPLL5, and both of these require this clock
	* to be at 120 MHz for proper operation.
	*/
	#define DPLL5_FREQ_FOR_USBHOST 120000000

	/* needed by omap3_core_dpll_m2_set_rate() */
	struct clk sdrc_ick_p, arm_fck_p;

	/**
	* omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
	* @clk: struct clk * being enabled
	* @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
	* @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
	*
	* The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
	* from the CM_{I,F}CLKEN bit. Pass back the correct info via
	* @idlest_reg and @idlest_bit. No return value.
	*/
	static void omap3430es2_clk_ssi_find_idlest(struct clk *clk,
	void __iomem **idlest_reg,
	u8 *idlest_bit)
	{
	u32 r;

	r = (((__force u32)clk->enable_reg & ~0xf0) \| 0x20);
	idlest_reg = (__force void __iomem )r;
	*idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
	}

	const struct clkops clkops_omap3430es2_ssi_wait = {
	.enable = omap2_dflt_clk_enable,
	.disable = omap2_dflt_clk_disable,
	.find_idlest = omap3430es2_clk_ssi_find_idlest,
	.find_companion = omap2_clk_dflt_find_companion,
	};

	/**
	* omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
	* @clk: struct clk * being enabled
	* @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
	* @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
	*
	* Some OMAP modules on OMAP3 ES2+ chips have both initiator and
	* target IDLEST bits. For our purposes, we are concerned with the
	* target IDLEST bits, which exist at a different bit position than
	* the *CLKEN bit position for these modules (DSS and USBHOST) (The
	* default find_idlest code assumes that they are at the same
	* position.) No return value.
	*/
	static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk,
	void __iomem **idlest_reg,
	u8 *idlest_bit)
	{
	u32 r;

	r = (((__force u32)clk->enable_reg & ~0xf0) \| 0x20);
	idlest_reg = (__force void __iomem )r;
	/* USBHOST_IDLE has same shift */
	*idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
	}

	const struct clkops clkops_omap3430es2_dss_usbhost_wait = {
	.enable = omap2_dflt_clk_enable,
	.disable = omap2_dflt_clk_disable,
	.find_idlest = omap3430es2_clk_dss_usbhost_find_idlest,
	.find_companion = omap2_clk_dflt_find_companion,
	};

	/**
	* omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
	* @clk: struct clk * being enabled
	* @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
	* @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
	*
	* The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
	* shift from the CM_{I,F}CLKEN bit. Pass back the correct info via
	* @idlest_reg and @idlest_bit. No return value.
	*/
	static void omap3430es2_clk_hsotgusb_find_idlest(struct clk *clk,
	void __iomem **idlest_reg,
	u8 *idlest_bit)
	{
	u32 r;

	r = (((__force u32)clk->enable_reg & ~0xf0) \| 0x20);
	idlest_reg = (__force void __iomem )r;
	*idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
	}

	const struct clkops clkops_omap3430es2_hsotgusb_wait = {
	.enable = omap2_dflt_clk_enable,
	.disable = omap2_dflt_clk_disable,
	.find_idlest = omap3430es2_clk_hsotgusb_find_idlest,
	.find_companion = omap2_clk_dflt_find_companion,
	};

	const struct clkops clkops_noncore_dpll_ops = {
	.enable = omap3_noncore_dpll_enable,
	.disable = omap3_noncore_dpll_disable,
	};

	int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
	{
	/*
	* According to the 12-5 CDP code from TI, "Limitation 2.5"
	* on 3430ES1 prevents us from changing DPLL multipliers or dividers
	* on DPLL4.
	*/
	if (omap_rev() == OMAP3430_REV_ES1_0) {
	printk(KERN_ERR "clock: DPLL4 cannot change rate due to "
	"silicon 'Limitation 2.5' on 3430ES1.\n");
	return -EINVAL;
	}
	return omap3_noncore_dpll_set_rate(clk, rate);
	}


	/*
	* CORE DPLL (DPLL3) rate programming functions
	*
	* These call into SRAM code to do the actual CM writes, since the SDRAM
	* is clocked from DPLL3.
	*/

	/**
	* omap3_core_dpll_m2_set_rate - set CORE DPLL M2 divider
	* @clk: struct clk * of DPLL to set
	* @rate: rounded target rate
	*
	* Program the DPLL M2 divider with the rounded target rate. Returns
	* -EINVAL upon error, or 0 upon success.
	*/
	int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
	{
	u32 new_div = 0;
	u32 unlock_dll = 0;
	u32 c;
	unsigned long validrate, sdrcrate, _mpurate;
	struct omap_sdrc_params *sdrc_cs0;
	struct omap_sdrc_params *sdrc_cs1;
	int ret;

	if (!clk \|\| !rate)
	return -EINVAL;

	validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
	if (validrate != rate)
	return -EINVAL;

	sdrcrate = sdrc_ick_p->rate;
	if (rate > clk->rate)
	sdrcrate <<= ((rate / clk->rate) >> 1);
	else
	sdrcrate >>= ((clk->rate / rate) >> 1);

	ret = omap2_sdrc_get_params(sdrcrate, &sdrc_cs0, &sdrc_cs1);
	if (ret)
	return -EINVAL;

	if (sdrcrate < MIN_SDRC_DLL_LOCK_FREQ) {
	pr_debug("clock: will unlock SDRC DLL\n");
	unlock_dll = 1;
	}

	/*
	* XXX This only needs to be done when the CPU frequency changes
	*/
	_mpurate = arm_fck_p->rate / CYCLES_PER_MHZ;
	c = (_mpurate << SDRC_MPURATE_SCALE) >> SDRC_MPURATE_BASE_SHIFT;
	c += 1; /* for safety */
	c *= SDRC_MPURATE_LOOPS;
	c >>= SDRC_MPURATE_SCALE;
	if (c == 0)
	c = 1;

	pr_debug("clock: changing CORE DPLL rate from %lu to %lu\n", clk->rate,
	validrate);
	pr_debug("clock: SDRC CS0 timing params used:"
	" RFR %08x CTRLA %08x CTRLB %08x MR %08x\n",
	sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
	sdrc_cs0->actim_ctrlb, sdrc_cs0->mr);
	if (sdrc_cs1)
	pr_debug("clock: SDRC CS1 timing params used: "
	" RFR %08x CTRLA %08x CTRLB %08x MR %08x\n",
	sdrc_cs1->rfr_ctrl, sdrc_cs1->actim_ctrla,
	sdrc_cs1->actim_ctrlb, sdrc_cs1->mr);

	if (sdrc_cs1)
	omap3_configure_core_dpll(
	new_div, unlock_dll, c, rate > clk->rate,
	sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
	sdrc_cs0->actim_ctrlb, sdrc_cs0->mr,
	sdrc_cs1->rfr_ctrl, sdrc_cs1->actim_ctrla,
	sdrc_cs1->actim_ctrlb, sdrc_cs1->mr);
	else
	omap3_configure_core_dpll(
	new_div, unlock_dll, c, rate > clk->rate,
	sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
	sdrc_cs0->actim_ctrlb, sdrc_cs0->mr,
	0, 0, 0, 0);

	return 0;
	}

	/* Common clock code */

	/*
	* As it is structured now, this will prevent an OMAP2/3 multiboot
	* kernel from compiling. This will need further attention.
	*/
	#if defined(CONFIG_ARCH_OMAP3)

	struct clk_functions omap2_clk_functions = {
	.clk_enable = omap2_clk_enable,
	.clk_disable = omap2_clk_disable,
	.clk_round_rate = omap2_clk_round_rate,
	.clk_set_rate = omap2_clk_set_rate,
	.clk_set_parent = omap2_clk_set_parent,
	.clk_disable_unused = omap2_clk_disable_unused,
	};

	/*
	* Set clocks for bypass mode for reboot to work.
	*/
	void omap2_clk_prepare_for_reboot(void)
	{
	/* REVISIT: Not ready for 343x */
	#if 0
	u32 rate;

	if (vclk == NULL \|\| sclk == NULL)
	return;

	rate = clk_get_rate(sclk);
	clk_set_rate(vclk, rate);
	#endif
	}

	void omap3_clk_lock_dpll5(void)
	{
	struct clk *dpll5_clk;
	struct clk *dpll5_m2_clk;

	dpll5_clk = clk_get(NULL, "dpll5_ck");
	clk_set_rate(dpll5_clk, DPLL5_FREQ_FOR_USBHOST);
	clk_enable(dpll5_clk);

	/* Enable autoidle to allow it to enter low power bypass */
	omap3_dpll_allow_idle(dpll5_clk);

	/* Program dpll5_m2_clk divider for no division */
	dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck");
	clk_enable(dpll5_m2_clk);
	clk_set_rate(dpll5_m2_clk, DPLL5_FREQ_FOR_USBHOST);

	clk_disable(dpll5_m2_clk);
	clk_disable(dpll5_clk);
	return;
	}

	/* REVISIT: Move this init stuff out into clock.c */

	/*
	* Switch the MPU rate if specified on cmdline.
	* We cannot do this early until cmdline is parsed.
	*/
	static int __init omap2_clk_arch_init(void)
	{
	struct clk osc_sys_ck, dpll1_ck, arm_fck, core_ck;
	unsigned long osc_sys_rate;

	if (!mpurate)
	return -EINVAL;

	/* XXX test these for success */
	dpll1_ck = clk_get(NULL, "dpll1_ck");
	arm_fck = clk_get(NULL, "arm_fck");
	core_ck = clk_get(NULL, "core_ck");
	osc_sys_ck = clk_get(NULL, "osc_sys_ck");

	/* REVISIT: not yet ready for 343x */
	if (clk_set_rate(dpll1_ck, mpurate))
	printk(KERN_ERR "*** Unable to set MPU rate\n");

	recalculate_root_clocks();

	osc_sys_rate = clk_get_rate(osc_sys_ck);

	pr_info("Switched to new clocking rate (Crystal/Core/MPU): "
	"%ld.%01ld/%ld/%ld MHz\n",
	(osc_sys_rate / 1000000),
	((osc_sys_rate / 100000) % 10),
	(clk_get_rate(core_ck) / 1000000),
	(clk_get_rate(arm_fck) / 1000000));

	calibrate_delay();

	return 0;
	}
	arch_initcall(omap2_clk_arch_init);


	#endif