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

 /*
  *  linux/arch/arm/mach-omap2/clock.c
  *
  *  Copyright (C) 2005-2008 Texas Instruments, Inc.
  *  Copyright (C) 2004-2010 Nokia Corporation
  *
  *  Contacts:
  *  Richard Woodruff <r-woodruff2@ti.com>
  *  Paul Walmsley
  *
  * 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/kernel.h>
 #include <linux/export.h>
 #include <linux/list.h>
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/clk-provider.h>
 #include <linux/io.h>
 #include <linux/bitops.h>
 #include <linux/clk-private.h>
 #include <asm/cpu.h>

 #include <trace/events/power.h>

 #include "soc.h"
 #include "clockdomain.h"
 #include "clock.h"
 #include "cm.h"
 #include "cm2xxx.h"
 #include "cm3xxx.h"
 #include "cm-regbits-24xx.h"
 #include "cm-regbits-34xx.h"
 #include "common.h"

 /*
  * MAX_MODULE_ENABLE_WAIT: maximum of number of microseconds to wait
  * for a module to indicate that it is no longer in idle
  */
 #define MAX_MODULE_ENABLE_WAIT		100000

 u16 cpu_mask;

 /*
  * clkdm_control: if true, then when a clock is enabled in the
  * hardware, its clockdomain will first be enabled; and when a clock
  * is disabled in the hardware, its clockdomain will be disabled
  * afterwards.
  */
 static bool clkdm_control = true;

 static LIST_HEAD(clk_hw_omap_clocks);
 void __iomem *clk_memmaps[CLK_MAX_MEMMAPS];

 void omap2_clk_writel(u32 val, struct clk_hw_omap *clk, void __iomem *reg)
 {
 	if (clk->flags & MEMMAP_ADDRESSING) {
 		struct clk_omap_reg *r = (struct clk_omap_reg *)&reg;
 		writel_relaxed(val, clk_memmaps[r->index] + r->offset);
 	} else {
 		writel_relaxed(val, reg);
 	}
 }

 u32 omap2_clk_readl(struct clk_hw_omap *clk, void __iomem *reg)
 {
 	u32 val;

 	if (clk->flags & MEMMAP_ADDRESSING) {
 		struct clk_omap_reg *r = (struct clk_omap_reg *)&reg;
 		val = readl_relaxed(clk_memmaps[r->index] + r->offset);
 	} else {
 		val = readl_relaxed(reg);
 	}

 	return val;
 }

 /*
  * Used for clocks that have the same value as the parent clock,
  * divided by some factor
  */
 unsigned long omap_fixed_divisor_recalc(struct clk_hw *hw,
 		unsigned long parent_rate)
 {
 	struct clk_hw_omap *oclk;

 	if (!hw) {
 		pr_warn("%s: hw is NULL\n", __func__);
 		return -EINVAL;
 	}

 	oclk = to_clk_hw_omap(hw);

 	WARN_ON(!oclk->fixed_div);

 	return parent_rate / oclk->fixed_div;
 }

 /*
  * OMAP2+ specific clock functions
  */

 /* Private functions */


 /**
  * _wait_idlest_generic - wait for a module to leave the idle state
  * @clk: module clock to wait for (needed for register offsets)
  * @reg: virtual address of module IDLEST register
  * @mask: value to mask against to determine if the module is active
  * @idlest: idle state indicator (0 or 1) for the clock
  * @name: name of the clock (for printk)
  *
  * Wait for a module to leave idle, where its idle-status register is
  * not inside the CM module.  Returns 1 if the module left idle
  * promptly, or 0 if the module did not leave idle before the timeout
  * elapsed.  XXX Deprecated - should be moved into drivers for the
  * individual IP block that the IDLEST register exists in.
  */
 static int _wait_idlest_generic(struct clk_hw_omap *clk, void __iomem *reg,
 				u32 mask, u8 idlest, const char *name)
 {
 	int i = 0, ena = 0;

 	ena = (idlest) ? 0 : mask;

 	omap_test_timeout(((omap2_clk_readl(clk, reg) & mask) == ena),
 			  MAX_MODULE_ENABLE_WAIT, i);

 	if (i < MAX_MODULE_ENABLE_WAIT)
 		pr_debug("omap clock: module associated with clock %s ready after %d loops\n",
 			 name, i);
 	else
 		pr_err("omap clock: module associated with clock %s didn't enable in %d tries\n",
 		       name, MAX_MODULE_ENABLE_WAIT);

 	return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0;
 };

 /**
  * _omap2_module_wait_ready - wait for an OMAP module to leave IDLE
  * @clk: struct clk * belonging to the module
  *
  * If the necessary clocks for the OMAP hardware IP block that
  * corresponds to clock @clk are enabled, then wait for the module to
  * indicate readiness (i.e., to leave IDLE).  This code does not
  * belong in the clock code and will be moved in the medium term to
  * module-dependent code.  No return value.
  */
 static void _omap2_module_wait_ready(struct clk_hw_omap *clk)
 {
 	void __iomem *companion_reg, *idlest_reg;
 	u8 other_bit, idlest_bit, idlest_val, idlest_reg_id;
 	s16 prcm_mod;
 	int r;

 	/* Not all modules have multiple clocks that their IDLEST depends on */
 	if (clk->ops->find_companion) {
 		clk->ops->find_companion(clk, &companion_reg, &other_bit);
 		if (!(omap2_clk_readl(clk, companion_reg) & (1 << other_bit)))
 			return;
 	}

 	clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val);
 	r = cm_split_idlest_reg(idlest_reg, &prcm_mod, &idlest_reg_id);
 	if (r) {
 		/* IDLEST register not in the CM module */
 		_wait_idlest_generic(clk, idlest_reg, (1 << idlest_bit),
 				     idlest_val, __clk_get_name(clk->hw.clk));
 	} else {
 		cm_wait_module_ready(prcm_mod, idlest_reg_id, idlest_bit);
 	};
 }

 /* Public functions */

 /**
  * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk
  * @clk: OMAP clock struct ptr to use
  *
  * Convert a clockdomain name stored in a struct clk 'clk' into a
  * clockdomain pointer, and save it into the struct clk.  Intended to be
  * called during clk_register().  No return value.
  */
 void omap2_init_clk_clkdm(struct clk_hw *hw)
 {
 	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
 	struct clockdomain *clkdm;
 	const char *clk_name;

 	if (!clk->clkdm_name)
 		return;

 	clk_name = __clk_get_name(hw->clk);

 	clkdm = clkdm_lookup(clk->clkdm_name);
 	if (clkdm) {
 		pr_debug("clock: associated clk %s to clkdm %s\n",
 			 clk_name, clk->clkdm_name);
 		clk->clkdm = clkdm;
 	} else {
 		pr_debug("clock: could not associate clk %s to clkdm %s\n",
 			 clk_name, clk->clkdm_name);
 	}
 }

 /**
  * omap2_clk_disable_clkdm_control - disable clkdm control on clk enable/disable
  *
  * Prevent the OMAP clock code from calling into the clockdomain code
  * when a hardware clock in that clockdomain is enabled or disabled.
  * Intended to be called at init time from omap*_clk_init().  No
  * return value.
  */
 void __init omap2_clk_disable_clkdm_control(void)
 {
 	clkdm_control = false;
 }

 /**
  * omap2_clk_dflt_find_companion - find companion clock to @clk
  * @clk: struct clk * to find the companion clock of
  * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
  * @other_bit: u8 ** to return the companion clock bit shift in
  *
  * Note: We don't need special code here for INVERT_ENABLE for the
  * time being since INVERT_ENABLE only applies to clocks enabled by
  * CM_CLKEN_PLL
  *
  * Convert CM_ICLKEN* <-> CM_FCLKEN*.  This conversion assumes it's
  * just a matter of XORing the bits.
  *
  * Some clocks don't have companion clocks.  For example, modules with
  * only an interface clock (such as MAILBOXES) don't have a companion
  * clock.  Right now, this code relies on the hardware exporting a bit
  * in the correct companion register that indicates that the
  * nonexistent 'companion clock' is active.  Future patches will
  * associate this type of code with per-module data structures to
  * avoid this issue, and remove the casts.  No return value.
  */
 void omap2_clk_dflt_find_companion(struct clk_hw_omap *clk,
 			void __iomem **other_reg, u8 *other_bit)
 {
 	u32 r;

 	/*
 	 * Convert CM_ICLKEN* <-> CM_FCLKEN*.  This conversion assumes
 	 * it's just a matter of XORing the bits.
 	 */
 	r = ((__force u32)clk->enable_reg ^ (CM_FCLKEN ^ CM_ICLKEN));

 	*other_reg = (__force void __iomem *)r;
 	*other_bit = clk->enable_bit;
 }

 /**
  * omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk
  * @clk: struct clk * to find IDLEST info for
  * @idlest_reg: void __iomem ** to return the CM_IDLEST va in
  * @idlest_bit: u8 * to return the CM_IDLEST bit shift in
  * @idlest_val: u8 * to return the idle status indicator
  *
  * Return the CM_IDLEST register address and bit shift corresponding
  * to the module that "owns" this clock.  This default code assumes
  * that the CM_IDLEST bit shift is the CM_*CLKEN bit shift, and that
  * the IDLEST register address ID corresponds to the CM_*CLKEN
  * register address ID (e.g., that CM_FCLKEN2 corresponds to
  * CM_IDLEST2).  This is not true for all modules.  No return value.
  */
 void omap2_clk_dflt_find_idlest(struct clk_hw_omap *clk,
 		void __iomem **idlest_reg, u8 *idlest_bit, u8 *idlest_val)
 {
 	u32 r;

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

 	/*
 	 * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
 	 * 34xx reverses this, just to keep us on our toes
 	 * AM35xx uses both, depending on the module.
 	 */
 	if (cpu_is_omap24xx())
 		*idlest_val = OMAP24XX_CM_IDLEST_VAL;
 	else if (cpu_is_omap34xx())
 		*idlest_val = OMAP34XX_CM_IDLEST_VAL;
 	else
 		BUG();

 }

 /**
  * omap2_dflt_clk_enable - enable a clock in the hardware
  * @hw: struct clk_hw * of the clock to enable
  *
  * Enable the clock @hw in the hardware.  We first call into the OMAP
  * clockdomain code to "enable" the corresponding clockdomain if this
  * is the first enabled user of the clockdomain.  Then program the
  * hardware to enable the clock.  Then wait for the IP block that uses
  * this clock to leave idle (if applicable).  Returns the error value
  * from clkdm_clk_enable() if it terminated with an error, or -EINVAL
  * if @hw has a null clock enable_reg, or zero upon success.
  */
 int omap2_dflt_clk_enable(struct clk_hw *hw)
 {
 	struct clk_hw_omap *clk;
 	u32 v;
 	int ret = 0;

 	clk = to_clk_hw_omap(hw);

 	if (clkdm_control && clk->clkdm) {
 		ret = clkdm_clk_enable(clk->clkdm, hw->clk);
 		if (ret) {
 			WARN(1, "%s: could not enable %s's clockdomain %s: %d\n",
 			     __func__, __clk_get_name(hw->clk),
 			     clk->clkdm->name, ret);
 			return ret;
 		}
 	}

 	if (unlikely(clk->enable_reg == NULL)) {
 		pr_err("%s: %s missing enable_reg\n", __func__,
 		       __clk_get_name(hw->clk));
 		ret = -EINVAL;
 		goto err;
 	}

 	/* FIXME should not have INVERT_ENABLE bit here */
 	v = omap2_clk_readl(clk, clk->enable_reg);
 	if (clk->flags & INVERT_ENABLE)
 		v &= ~(1 << clk->enable_bit);
 	else
 		v |= (1 << clk->enable_bit);
 	omap2_clk_writel(v, clk, clk->enable_reg);
 	v = omap2_clk_readl(clk, clk->enable_reg); /* OCP barrier */

 	if (clk->ops && clk->ops->find_idlest)
 		_omap2_module_wait_ready(clk);

 	return 0;

 err:
 	if (clkdm_control && clk->clkdm)
 		clkdm_clk_disable(clk->clkdm, hw->clk);
 	return ret;
 }

 /**
  * omap2_dflt_clk_disable - disable a clock in the hardware
  * @hw: struct clk_hw * of the clock to disable
  *
  * Disable the clock @hw in the hardware, and call into the OMAP
  * clockdomain code to "disable" the corresponding clockdomain if all
  * clocks/hwmods in that clockdomain are now disabled.  No return
  * value.
  */
 void omap2_dflt_clk_disable(struct clk_hw *hw)
 {
 	struct clk_hw_omap *clk;
 	u32 v;

 	clk = to_clk_hw_omap(hw);
 	if (!clk->enable_reg) {
 		/*
 		 * 'independent' here refers to a clock which is not
 		 * controlled by its parent.
 		 */
 		pr_err("%s: independent clock %s has no enable_reg\n",
 		       __func__, __clk_get_name(hw->clk));
 		return;
 	}

 	v = omap2_clk_readl(clk, clk->enable_reg);
 	if (clk->flags & INVERT_ENABLE)
 		v |= (1 << clk->enable_bit);
 	else
 		v &= ~(1 << clk->enable_bit);
 	omap2_clk_writel(v, clk, clk->enable_reg);
 	/* No OCP barrier needed here since it is a disable operation */

 	if (clkdm_control && clk->clkdm)
 		clkdm_clk_disable(clk->clkdm, hw->clk);
 }

 /**
  * omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw
  * @hw: struct clk_hw * of the clock being enabled
  *
  * Increment the usecount of the clockdomain of the clock pointed to
  * by @hw; if the usecount is 1, the clockdomain will be "enabled."
  * Only needed for clocks that don't use omap2_dflt_clk_enable() as
  * their enable function pointer.  Passes along the return value of
  * clkdm_clk_enable(), -EINVAL if @hw is not associated with a
  * clockdomain, or 0 if clock framework-based clockdomain control is
  * not implemented.
  */
 int omap2_clkops_enable_clkdm(struct clk_hw *hw)
 {
 	struct clk_hw_omap *clk;
 	int ret = 0;

 	clk = to_clk_hw_omap(hw);

 	if (unlikely(!clk->clkdm)) {
 		pr_err("%s: %s: no clkdm set ?!\n", __func__,
 		       __clk_get_name(hw->clk));
 		return -EINVAL;
 	}

 	if (unlikely(clk->enable_reg))
 		pr_err("%s: %s: should use dflt_clk_enable ?!\n", __func__,
 		       __clk_get_name(hw->clk));

 	if (!clkdm_control) {
 		pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
 		       __func__, __clk_get_name(hw->clk));
 		return 0;
 	}

 	ret = clkdm_clk_enable(clk->clkdm, hw->clk);
 	WARN(ret, "%s: could not enable %s's clockdomain %s: %d\n",
 	     __func__, __clk_get_name(hw->clk), clk->clkdm->name, ret);

 	return ret;
 }

 /**
  * omap2_clkops_disable_clkdm - decrement usecount on clkdm of @hw
  * @hw: struct clk_hw * of the clock being disabled
  *
  * Decrement the usecount of the clockdomain of the clock pointed to
  * by @hw; if the usecount is 0, the clockdomain will be "disabled."
  * Only needed for clocks that don't use omap2_dflt_clk_disable() as their
  * disable function pointer.  No return value.
  */
 void omap2_clkops_disable_clkdm(struct clk_hw *hw)
 {
 	struct clk_hw_omap *clk;

 	clk = to_clk_hw_omap(hw);

 	if (unlikely(!clk->clkdm)) {
 		pr_err("%s: %s: no clkdm set ?!\n", __func__,
 		       __clk_get_name(hw->clk));
 		return;
 	}

 	if (unlikely(clk->enable_reg))
 		pr_err("%s: %s: should use dflt_clk_disable ?!\n", __func__,
 		       __clk_get_name(hw->clk));

 	if (!clkdm_control) {
 		pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
 		       __func__, __clk_get_name(hw->clk));
 		return;
 	}

 	clkdm_clk_disable(clk->clkdm, hw->clk);
 }

 /**
  * omap2_dflt_clk_is_enabled - is clock enabled in the hardware?
  * @hw: struct clk_hw * to check
  *
  * Return 1 if the clock represented by @hw is enabled in the
  * hardware, or 0 otherwise.  Intended for use in the struct
  * clk_ops.is_enabled function pointer.
  */
 int omap2_dflt_clk_is_enabled(struct clk_hw *hw)
 {
 	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
 	u32 v;

 	v = omap2_clk_readl(clk, clk->enable_reg);

 	if (clk->flags & INVERT_ENABLE)
 		v ^= BIT(clk->enable_bit);

 	v &= BIT(clk->enable_bit);

 	return v ? 1 : 0;
 }

 static int __initdata mpurate;

 /*
  * By default we use the rate set by the bootloader.
  * You can override this with mpurate= cmdline option.
  */
 static int __init omap_clk_setup(char *str)
 {
 	get_option(&str, &mpurate);

 	if (!mpurate)
 		return 1;

 	if (mpurate < 1000)
 		mpurate *= 1000000;

 	return 1;
 }
 __setup("mpurate=", omap_clk_setup);

 /**
  * omap2_init_clk_hw_omap_clocks - initialize an OMAP clock
  * @clk: struct clk * to initialize
  *
  * Add an OMAP clock @clk to the internal list of OMAP clocks.  Used
  * temporarily for autoidle handling, until this support can be
  * integrated into the common clock framework code in some way.  No
  * return value.
  */
 void omap2_init_clk_hw_omap_clocks(struct clk *clk)
 {
 	struct clk_hw_omap *c;

 	if (__clk_get_flags(clk) & CLK_IS_BASIC)
 		return;

 	c = to_clk_hw_omap(__clk_get_hw(clk));
 	list_add(&c->node, &clk_hw_omap_clocks);
 }

 /**
  * omap2_clk_enable_autoidle_all - enable autoidle on all OMAP clocks that
  * support it
  *
  * Enable clock autoidle on all OMAP clocks that have allow_idle
  * function pointers associated with them.  This function is intended
  * to be temporary until support for this is added to the common clock
  * code.  Returns 0.
  */
 int omap2_clk_enable_autoidle_all(void)
 {
 	struct clk_hw_omap *c;

 	list_for_each_entry(c, &clk_hw_omap_clocks, node)
 		if (c->ops && c->ops->allow_idle)
 			c->ops->allow_idle(c);

 	of_ti_clk_allow_autoidle_all();

 	return 0;
 }

 /**
  * omap2_clk_disable_autoidle_all - disable autoidle on all OMAP clocks that
  * support it
  *
  * Disable clock autoidle on all OMAP clocks that have allow_idle
  * function pointers associated with them.  This function is intended
  * to be temporary until support for this is added to the common clock
  * code.  Returns 0.
  */
 int omap2_clk_disable_autoidle_all(void)
 {
 	struct clk_hw_omap *c;

 	list_for_each_entry(c, &clk_hw_omap_clocks, node)
 		if (c->ops && c->ops->deny_idle)
 			c->ops->deny_idle(c);

 	of_ti_clk_deny_autoidle_all();

 	return 0;
 }

 /**
  * omap2_clk_deny_idle - disable autoidle on an OMAP clock
  * @clk: struct clk * to disable autoidle for
  *
  * Disable autoidle on an OMAP clock.
  */
 int omap2_clk_deny_idle(struct clk *clk)
 {
 	struct clk_hw_omap *c;

 	if (__clk_get_flags(clk) & CLK_IS_BASIC)
 		return -EINVAL;

 	c = to_clk_hw_omap(__clk_get_hw(clk));
 	if (c->ops && c->ops->deny_idle)
 		c->ops->deny_idle(c);
 	return 0;
 }

 /**
  * omap2_clk_allow_idle - enable autoidle on an OMAP clock
  * @clk: struct clk * to enable autoidle for
  *
  * Enable autoidle on an OMAP clock.
  */
 int omap2_clk_allow_idle(struct clk *clk)
 {
 	struct clk_hw_omap *c;

 	if (__clk_get_flags(clk) & CLK_IS_BASIC)
 		return -EINVAL;

 	c = to_clk_hw_omap(__clk_get_hw(clk));
 	if (c->ops && c->ops->allow_idle)
 		c->ops->allow_idle(c);
 	return 0;
 }

 /**
  * omap2_clk_enable_init_clocks - prepare & enable a list of clocks
  * @clk_names: ptr to an array of strings of clock names to enable
  * @num_clocks: number of clock names in @clk_names
  *
  * Prepare and enable a list of clocks, named by @clk_names.  No
  * return value. XXX Deprecated; only needed until these clocks are
  * properly claimed and enabled by the drivers or core code that uses
  * them.  XXX What code disables & calls clk_put on these clocks?
  */
 void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
 {
 	struct clk *init_clk;
 	int i;

 	for (i = 0; i < num_clocks; i++) {
 		init_clk = clk_get(NULL, clk_names[i]);
 		clk_prepare_enable(init_clk);
 	}
 }

 const struct clk_hw_omap_ops clkhwops_wait = {
 	.find_idlest	= omap2_clk_dflt_find_idlest,
 	.find_companion	= omap2_clk_dflt_find_companion,
 };

 /**
  * omap_clocks_register - register an array of omap_clk
  * @ocs: pointer to an array of omap_clk to register
  */
 void __init omap_clocks_register(struct omap_clk oclks[], int cnt)
 {
 	struct omap_clk *c;

 	for (c = oclks; c < oclks + cnt; c++) {
 		clkdev_add(&c->lk);
 		if (!__clk_init(NULL, c->lk.clk))
 			omap2_init_clk_hw_omap_clocks(c->lk.clk);
 	}
 }

 /**
  * omap2_clk_switch_mpurate_at_boot - switch ARM MPU rate by boot-time argument
  * @mpurate_ck_name: clk name of the clock to change rate
  *
  * Change the ARM MPU clock rate to the rate specified on the command
  * line, if one was specified.  @mpurate_ck_name should be
  * "virt_prcm_set" on OMAP2xxx and "dpll1_ck" on OMAP34xx/OMAP36xx.
  * XXX Does not handle voltage scaling - on OMAP2xxx this is currently
  * handled by the virt_prcm_set clock, but this should be handled by
  * the OPP layer.  XXX This is intended to be handled by the OPP layer
  * code in the near future and should be removed from the clock code.
  * Returns -EINVAL if 'mpurate' is zero or if clk_set_rate() rejects
  * the rate, -ENOENT if the struct clk referred to by @mpurate_ck_name
  * cannot be found, or 0 upon success.
  */
 int __init omap2_clk_switch_mpurate_at_boot(const char *mpurate_ck_name)
 {
 	struct clk *mpurate_ck;
 	int r;

 	if (!mpurate)
 		return -EINVAL;

 	mpurate_ck = clk_get(NULL, mpurate_ck_name);
 	if (WARN(IS_ERR(mpurate_ck), "Failed to get %s.\n", mpurate_ck_name))
 		return -ENOENT;

 	r = clk_set_rate(mpurate_ck, mpurate);
 	if (r < 0) {
 		WARN(1, "clock: %s: unable to set MPU rate to %d: %d\n",
 		     mpurate_ck_name, mpurate, r);
 		clk_put(mpurate_ck);
 		return -EINVAL;
 	}

 	calibrate_delay();
 	clk_put(mpurate_ck);

 	return 0;
 }

 /**
  * omap2_clk_print_new_rates - print summary of current clock tree rates
  * @hfclkin_ck_name: clk name for the off-chip HF oscillator
  * @core_ck_name: clk name for the on-chip CORE_CLK
  * @mpu_ck_name: clk name for the ARM MPU clock
  *
  * Prints a short message to the console with the HFCLKIN oscillator
  * rate, the rate of the CORE clock, and the rate of the ARM MPU clock.
  * Called by the boot-time MPU rate switching code.   XXX This is intended
  * to be handled by the OPP layer code in the near future and should be
  * removed from the clock code.  No return value.
  */
 void __init omap2_clk_print_new_rates(const char *hfclkin_ck_name,
 				      const char *core_ck_name,
 				      const char *mpu_ck_name)
 {
 	struct clk *hfclkin_ck, *core_ck, *mpu_ck;
 	unsigned long hfclkin_rate;

 	mpu_ck = clk_get(NULL, mpu_ck_name);
 	if (WARN(IS_ERR(mpu_ck), "clock: failed to get %s.\n", mpu_ck_name))
 		return;

 	core_ck = clk_get(NULL, core_ck_name);
 	if (WARN(IS_ERR(core_ck), "clock: failed to get %s.\n", core_ck_name))
 		return;

 	hfclkin_ck = clk_get(NULL, hfclkin_ck_name);
 	if (WARN(IS_ERR(hfclkin_ck), "Failed to get %s.\n", hfclkin_ck_name))
 		return;

 	hfclkin_rate = clk_get_rate(hfclkin_ck);

 	pr_info("Switched to new clocking rate (Crystal/Core/MPU): %ld.%01ld/%ld/%ld MHz\n",
 		(hfclkin_rate / 1000000), ((hfclkin_rate / 100000) % 10),
 		(clk_get_rate(core_ck) / 1000000),
 		(clk_get_rate(mpu_ck) / 1000000));
 }
	/*
	* linux/arch/arm/mach-omap2/clock.c
	*
	* Copyright (C) 2005-2008 Texas Instruments, Inc.
	* Copyright (C) 2004-2010 Nokia Corporation
	*
	* Contacts:
	* Richard Woodruff <r-woodruff2@ti.com>
	* Paul Walmsley
	*
	* 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/kernel.h>
	#include <linux/export.h>
	#include <linux/list.h>
	#include <linux/errno.h>
	#include <linux/err.h>
	#include <linux/delay.h>
	#include <linux/clk-provider.h>
	#include <linux/io.h>
	#include <linux/bitops.h>
	#include <linux/clk-private.h>
	#include <asm/cpu.h>

	#include <trace/events/power.h>

	#include "soc.h"
	#include "clockdomain.h"
	#include "clock.h"
	#include "cm.h"
	#include "cm2xxx.h"
	#include "cm3xxx.h"
	#include "cm-regbits-24xx.h"
	#include "cm-regbits-34xx.h"
	#include "common.h"

	/*
	* MAX_MODULE_ENABLE_WAIT: maximum of number of microseconds to wait
	* for a module to indicate that it is no longer in idle
	*/
	#define MAX_MODULE_ENABLE_WAIT 100000

	u16 cpu_mask;

	/*
	* clkdm_control: if true, then when a clock is enabled in the
	* hardware, its clockdomain will first be enabled; and when a clock
	* is disabled in the hardware, its clockdomain will be disabled
	* afterwards.
	*/
	static bool clkdm_control = true;

	static LIST_HEAD(clk_hw_omap_clocks);
	void __iomem *clk_memmaps[CLK_MAX_MEMMAPS];

	void omap2_clk_writel(u32 val, struct clk_hw_omap clk, void __iomem reg)
	{
	if (clk->flags & MEMMAP_ADDRESSING) {
	struct clk_omap_reg r = (struct clk_omap_reg )®
	writel_relaxed(val, clk_memmaps[r->index] + r->offset);
	} else {
	writel_relaxed(val, reg);
	}
	}

	u32 omap2_clk_readl(struct clk_hw_omap clk, void __iomem reg)
	{
	u32 val;

	if (clk->flags & MEMMAP_ADDRESSING) {
	struct clk_omap_reg r = (struct clk_omap_reg )®
	val = readl_relaxed(clk_memmaps[r->index] + r->offset);
	} else {
	val = readl_relaxed(reg);
	}

	return val;
	}

	/*
	* Used for clocks that have the same value as the parent clock,
	* divided by some factor
	*/
	unsigned long omap_fixed_divisor_recalc(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct clk_hw_omap *oclk;

	if (!hw) {
	pr_warn("%s: hw is NULL\n", __func__);
	return -EINVAL;
	}

	oclk = to_clk_hw_omap(hw);

	WARN_ON(!oclk->fixed_div);

	return parent_rate / oclk->fixed_div;
	}

	/*
	* OMAP2+ specific clock functions
	*/

	/* Private functions */


	/**
	* _wait_idlest_generic - wait for a module to leave the idle state
	* @clk: module clock to wait for (needed for register offsets)
	* @reg: virtual address of module IDLEST register
	* @mask: value to mask against to determine if the module is active
	* @idlest: idle state indicator (0 or 1) for the clock
	* @name: name of the clock (for printk)
	*
	* Wait for a module to leave idle, where its idle-status register is
	* not inside the CM module. Returns 1 if the module left idle
	* promptly, or 0 if the module did not leave idle before the timeout
	* elapsed. XXX Deprecated - should be moved into drivers for the
	* individual IP block that the IDLEST register exists in.
	*/
	static int _wait_idlest_generic(struct clk_hw_omap clk, void __iomem reg,
	u32 mask, u8 idlest, const char *name)
	{
	int i = 0, ena = 0;

	ena = (idlest) ? 0 : mask;

	omap_test_timeout(((omap2_clk_readl(clk, reg) & mask) == ena),
	MAX_MODULE_ENABLE_WAIT, i);

	if (i < MAX_MODULE_ENABLE_WAIT)
	pr_debug("omap clock: module associated with clock %s ready after %d loops\n",
	name, i);
	else
	pr_err("omap clock: module associated with clock %s didn't enable in %d tries\n",
	name, MAX_MODULE_ENABLE_WAIT);

	return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0;
	};

	/**
	* _omap2_module_wait_ready - wait for an OMAP module to leave IDLE
	* @clk: struct clk * belonging to the module
	*
	* If the necessary clocks for the OMAP hardware IP block that
	* corresponds to clock @clk are enabled, then wait for the module to
	* indicate readiness (i.e., to leave IDLE). This code does not
	* belong in the clock code and will be moved in the medium term to
	* module-dependent code. No return value.
	*/
	static void _omap2_module_wait_ready(struct clk_hw_omap *clk)
	{
	void __iomem companion_reg, idlest_reg;
	u8 other_bit, idlest_bit, idlest_val, idlest_reg_id;
	s16 prcm_mod;
	int r;

	/* Not all modules have multiple clocks that their IDLEST depends on */
	if (clk->ops->find_companion) {
	clk->ops->find_companion(clk, &companion_reg, &other_bit);
	if (!(omap2_clk_readl(clk, companion_reg) & (1 << other_bit)))
	return;
	}

	clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val);
	r = cm_split_idlest_reg(idlest_reg, &prcm_mod, &idlest_reg_id);
	if (r) {
	/* IDLEST register not in the CM module */
	_wait_idlest_generic(clk, idlest_reg, (1 << idlest_bit),
	idlest_val, __clk_get_name(clk->hw.clk));
	} else {
	cm_wait_module_ready(prcm_mod, idlest_reg_id, idlest_bit);
	};
	}

	/* Public functions */

	/**
	* omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk
	* @clk: OMAP clock struct ptr to use
	*
	* Convert a clockdomain name stored in a struct clk 'clk' into a
	* clockdomain pointer, and save it into the struct clk. Intended to be
	* called during clk_register(). No return value.
	*/
	void omap2_init_clk_clkdm(struct clk_hw *hw)
	{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	struct clockdomain *clkdm;
	const char *clk_name;

	if (!clk->clkdm_name)
	return;

	clk_name = __clk_get_name(hw->clk);

	clkdm = clkdm_lookup(clk->clkdm_name);
	if (clkdm) {
	pr_debug("clock: associated clk %s to clkdm %s\n",
	clk_name, clk->clkdm_name);
	clk->clkdm = clkdm;
	} else {
	pr_debug("clock: could not associate clk %s to clkdm %s\n",
	clk_name, clk->clkdm_name);
	}
	}

	/**
	* omap2_clk_disable_clkdm_control - disable clkdm control on clk enable/disable
	*
	* Prevent the OMAP clock code from calling into the clockdomain code
	* when a hardware clock in that clockdomain is enabled or disabled.
	* Intended to be called at init time from omap*_clk_init(). No
	* return value.
	*/
	void __init omap2_clk_disable_clkdm_control(void)
	{
	clkdm_control = false;
	}

	/**
	* omap2_clk_dflt_find_companion - find companion clock to @clk
	* @clk: struct clk * to find the companion clock of
	* @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
	* @other_bit: u8 ** to return the companion clock bit shift in
	*
	* Note: We don't need special code here for INVERT_ENABLE for the
	* time being since INVERT_ENABLE only applies to clocks enabled by
	* CM_CLKEN_PLL
	*
	* Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes it's
	* just a matter of XORing the bits.
	*
	* Some clocks don't have companion clocks. For example, modules with
	* only an interface clock (such as MAILBOXES) don't have a companion
	* clock. Right now, this code relies on the hardware exporting a bit
	* in the correct companion register that indicates that the
	* nonexistent 'companion clock' is active. Future patches will
	* associate this type of code with per-module data structures to
	* avoid this issue, and remove the casts. No return value.
	*/
	void omap2_clk_dflt_find_companion(struct clk_hw_omap *clk,
	void __iomem *other_reg, u8 other_bit)
	{
	u32 r;

	/*
	* Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes
	* it's just a matter of XORing the bits.
	*/
	r = ((__force u32)clk->enable_reg ^ (CM_FCLKEN ^ CM_ICLKEN));

	other_reg = (__force void __iomem )r;
	*other_bit = clk->enable_bit;
	}

	/**
	* omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk
	* @clk: struct clk * to find IDLEST info for
	* @idlest_reg: void __iomem ** to return the CM_IDLEST va in
	* @idlest_bit: u8 * to return the CM_IDLEST bit shift in
	* @idlest_val: u8 * to return the idle status indicator
	*
	* Return the CM_IDLEST register address and bit shift corresponding
	* to the module that "owns" this clock. This default code assumes
	* that the CM_IDLEST bit shift is the CM_*CLKEN bit shift, and that
	* the IDLEST register address ID corresponds to the CM_*CLKEN
	* register address ID (e.g., that CM_FCLKEN2 corresponds to
	* CM_IDLEST2). This is not true for all modules. No return value.
	*/
	void omap2_clk_dflt_find_idlest(struct clk_hw_omap *clk,
	void __iomem *idlest_reg, u8 idlest_bit, u8 *idlest_val)
	{
	u32 r;

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

	/*
	* 24xx uses 0 to indicate not ready, and 1 to indicate ready.
	* 34xx reverses this, just to keep us on our toes
	* AM35xx uses both, depending on the module.
	*/
	if (cpu_is_omap24xx())
	*idlest_val = OMAP24XX_CM_IDLEST_VAL;
	else if (cpu_is_omap34xx())
	*idlest_val = OMAP34XX_CM_IDLEST_VAL;
	else
	BUG();

	}

	/**
	* omap2_dflt_clk_enable - enable a clock in the hardware
	* @hw: struct clk_hw * of the clock to enable
	*
	* Enable the clock @hw in the hardware. We first call into the OMAP
	* clockdomain code to "enable" the corresponding clockdomain if this
	* is the first enabled user of the clockdomain. Then program the
	* hardware to enable the clock. Then wait for the IP block that uses
	* this clock to leave idle (if applicable). Returns the error value
	* from clkdm_clk_enable() if it terminated with an error, or -EINVAL
	* if @hw has a null clock enable_reg, or zero upon success.
	*/
	int omap2_dflt_clk_enable(struct clk_hw *hw)
	{
	struct clk_hw_omap *clk;
	u32 v;
	int ret = 0;

	clk = to_clk_hw_omap(hw);

	if (clkdm_control && clk->clkdm) {
	ret = clkdm_clk_enable(clk->clkdm, hw->clk);
	if (ret) {
	WARN(1, "%s: could not enable %s's clockdomain %s: %d\n",
	__func__, __clk_get_name(hw->clk),
	clk->clkdm->name, ret);
	return ret;
	}
	}

	if (unlikely(clk->enable_reg == NULL)) {
	pr_err("%s: %s missing enable_reg\n", __func__,
	__clk_get_name(hw->clk));
	ret = -EINVAL;
	goto err;
	}

	/* FIXME should not have INVERT_ENABLE bit here */
	v = omap2_clk_readl(clk, clk->enable_reg);
	if (clk->flags & INVERT_ENABLE)
	v &= ~(1 << clk->enable_bit);
	else
	v \|= (1 << clk->enable_bit);
	omap2_clk_writel(v, clk, clk->enable_reg);
	v = omap2_clk_readl(clk, clk->enable_reg); /* OCP barrier */

	if (clk->ops && clk->ops->find_idlest)
	_omap2_module_wait_ready(clk);

	return 0;

	err:
	if (clkdm_control && clk->clkdm)
	clkdm_clk_disable(clk->clkdm, hw->clk);
	return ret;
	}

	/**
	* omap2_dflt_clk_disable - disable a clock in the hardware
	* @hw: struct clk_hw * of the clock to disable
	*
	* Disable the clock @hw in the hardware, and call into the OMAP
	* clockdomain code to "disable" the corresponding clockdomain if all
	* clocks/hwmods in that clockdomain are now disabled. No return
	* value.
	*/
	void omap2_dflt_clk_disable(struct clk_hw *hw)
	{
	struct clk_hw_omap *clk;
	u32 v;

	clk = to_clk_hw_omap(hw);
	if (!clk->enable_reg) {
	/*
	* 'independent' here refers to a clock which is not
	* controlled by its parent.
	*/
	pr_err("%s: independent clock %s has no enable_reg\n",
	__func__, __clk_get_name(hw->clk));
	return;
	}

	v = omap2_clk_readl(clk, clk->enable_reg);
	if (clk->flags & INVERT_ENABLE)
	v \|= (1 << clk->enable_bit);
	else
	v &= ~(1 << clk->enable_bit);
	omap2_clk_writel(v, clk, clk->enable_reg);
	/* No OCP barrier needed here since it is a disable operation */

	if (clkdm_control && clk->clkdm)
	clkdm_clk_disable(clk->clkdm, hw->clk);
	}

	/**
	* omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw
	* @hw: struct clk_hw * of the clock being enabled
	*
	* Increment the usecount of the clockdomain of the clock pointed to
	* by @hw; if the usecount is 1, the clockdomain will be "enabled."
	* Only needed for clocks that don't use omap2_dflt_clk_enable() as
	* their enable function pointer. Passes along the return value of
	* clkdm_clk_enable(), -EINVAL if @hw is not associated with a
	* clockdomain, or 0 if clock framework-based clockdomain control is
	* not implemented.
	*/
	int omap2_clkops_enable_clkdm(struct clk_hw *hw)
	{
	struct clk_hw_omap *clk;
	int ret = 0;

	clk = to_clk_hw_omap(hw);

	if (unlikely(!clk->clkdm)) {
	pr_err("%s: %s: no clkdm set ?!\n", __func__,
	__clk_get_name(hw->clk));
	return -EINVAL;
	}

	if (unlikely(clk->enable_reg))
	pr_err("%s: %s: should use dflt_clk_enable ?!\n", __func__,
	__clk_get_name(hw->clk));

	if (!clkdm_control) {
	pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
	__func__, __clk_get_name(hw->clk));
	return 0;
	}

	ret = clkdm_clk_enable(clk->clkdm, hw->clk);
	WARN(ret, "%s: could not enable %s's clockdomain %s: %d\n",
	__func__, __clk_get_name(hw->clk), clk->clkdm->name, ret);

	return ret;
	}

	/**
	* omap2_clkops_disable_clkdm - decrement usecount on clkdm of @hw
	* @hw: struct clk_hw * of the clock being disabled
	*
	* Decrement the usecount of the clockdomain of the clock pointed to
	* by @hw; if the usecount is 0, the clockdomain will be "disabled."
	* Only needed for clocks that don't use omap2_dflt_clk_disable() as their
	* disable function pointer. No return value.
	*/
	void omap2_clkops_disable_clkdm(struct clk_hw *hw)
	{
	struct clk_hw_omap *clk;

	clk = to_clk_hw_omap(hw);

	if (unlikely(!clk->clkdm)) {
	pr_err("%s: %s: no clkdm set ?!\n", __func__,
	__clk_get_name(hw->clk));
	return;
	}

	if (unlikely(clk->enable_reg))
	pr_err("%s: %s: should use dflt_clk_disable ?!\n", __func__,
	__clk_get_name(hw->clk));

	if (!clkdm_control) {
	pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
	__func__, __clk_get_name(hw->clk));
	return;
	}

	clkdm_clk_disable(clk->clkdm, hw->clk);
	}

	/**
	* omap2_dflt_clk_is_enabled - is clock enabled in the hardware?
	* @hw: struct clk_hw * to check
	*
	* Return 1 if the clock represented by @hw is enabled in the
	* hardware, or 0 otherwise. Intended for use in the struct
	* clk_ops.is_enabled function pointer.
	*/
	int omap2_dflt_clk_is_enabled(struct clk_hw *hw)
	{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	u32 v;

	v = omap2_clk_readl(clk, clk->enable_reg);

	if (clk->flags & INVERT_ENABLE)
	v ^= BIT(clk->enable_bit);

	v &= BIT(clk->enable_bit);

	return v ? 1 : 0;
	}

	static int __initdata mpurate;

	/*
	* By default we use the rate set by the bootloader.
	* You can override this with mpurate= cmdline option.
	*/
	static int __init omap_clk_setup(char *str)
	{
	get_option(&str, &mpurate);

	if (!mpurate)
	return 1;

	if (mpurate < 1000)
	mpurate *= 1000000;

	return 1;
	}
	__setup("mpurate=", omap_clk_setup);

	/**
	* omap2_init_clk_hw_omap_clocks - initialize an OMAP clock
	* @clk: struct clk * to initialize
	*
	* Add an OMAP clock @clk to the internal list of OMAP clocks. Used
	* temporarily for autoidle handling, until this support can be
	* integrated into the common clock framework code in some way. No
	* return value.
	*/
	void omap2_init_clk_hw_omap_clocks(struct clk *clk)
	{
	struct clk_hw_omap *c;

	if (__clk_get_flags(clk) & CLK_IS_BASIC)
	return;

	c = to_clk_hw_omap(__clk_get_hw(clk));
	list_add(&c->node, &clk_hw_omap_clocks);
	}

	/**
	* omap2_clk_enable_autoidle_all - enable autoidle on all OMAP clocks that
	* support it
	*
	* Enable clock autoidle on all OMAP clocks that have allow_idle
	* function pointers associated with them. This function is intended
	* to be temporary until support for this is added to the common clock
	* code. Returns 0.
	*/
	int omap2_clk_enable_autoidle_all(void)
	{
	struct clk_hw_omap *c;

	list_for_each_entry(c, &clk_hw_omap_clocks, node)
	if (c->ops && c->ops->allow_idle)
	c->ops->allow_idle(c);

	of_ti_clk_allow_autoidle_all();

	return 0;
	}

	/**
	* omap2_clk_disable_autoidle_all - disable autoidle on all OMAP clocks that
	* support it
	*
	* Disable clock autoidle on all OMAP clocks that have allow_idle
	* function pointers associated with them. This function is intended
	* to be temporary until support for this is added to the common clock
	* code. Returns 0.
	*/
	int omap2_clk_disable_autoidle_all(void)
	{
	struct clk_hw_omap *c;

	list_for_each_entry(c, &clk_hw_omap_clocks, node)
	if (c->ops && c->ops->deny_idle)
	c->ops->deny_idle(c);

	of_ti_clk_deny_autoidle_all();

	return 0;
	}

	/**
	* omap2_clk_deny_idle - disable autoidle on an OMAP clock
	* @clk: struct clk * to disable autoidle for
	*
	* Disable autoidle on an OMAP clock.
	*/
	int omap2_clk_deny_idle(struct clk *clk)
	{
	struct clk_hw_omap *c;

	if (__clk_get_flags(clk) & CLK_IS_BASIC)
	return -EINVAL;

	c = to_clk_hw_omap(__clk_get_hw(clk));
	if (c->ops && c->ops->deny_idle)
	c->ops->deny_idle(c);
	return 0;
	}

	/**
	* omap2_clk_allow_idle - enable autoidle on an OMAP clock
	* @clk: struct clk * to enable autoidle for
	*
	* Enable autoidle on an OMAP clock.
	*/
	int omap2_clk_allow_idle(struct clk *clk)
	{
	struct clk_hw_omap *c;

	if (__clk_get_flags(clk) & CLK_IS_BASIC)
	return -EINVAL;

	c = to_clk_hw_omap(__clk_get_hw(clk));
	if (c->ops && c->ops->allow_idle)
	c->ops->allow_idle(c);
	return 0;
	}

	/**
	* omap2_clk_enable_init_clocks - prepare & enable a list of clocks
	* @clk_names: ptr to an array of strings of clock names to enable
	* @num_clocks: number of clock names in @clk_names
	*
	* Prepare and enable a list of clocks, named by @clk_names. No
	* return value. XXX Deprecated; only needed until these clocks are
	* properly claimed and enabled by the drivers or core code that uses
	* them. XXX What code disables & calls clk_put on these clocks?
	*/
	void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
	{
	struct clk *init_clk;
	int i;

	for (i = 0; i < num_clocks; i++) {
	init_clk = clk_get(NULL, clk_names[i]);
	clk_prepare_enable(init_clk);
	}
	}

	const struct clk_hw_omap_ops clkhwops_wait = {
	.find_idlest = omap2_clk_dflt_find_idlest,
	.find_companion = omap2_clk_dflt_find_companion,
	};

	/**
	* omap_clocks_register - register an array of omap_clk
	* @ocs: pointer to an array of omap_clk to register
	*/
	void __init omap_clocks_register(struct omap_clk oclks[], int cnt)
	{
	struct omap_clk *c;

	for (c = oclks; c < oclks + cnt; c++) {
	clkdev_add(&c->lk);
	if (!__clk_init(NULL, c->lk.clk))
	omap2_init_clk_hw_omap_clocks(c->lk.clk);
	}
	}

	/**
	* omap2_clk_switch_mpurate_at_boot - switch ARM MPU rate by boot-time argument
	* @mpurate_ck_name: clk name of the clock to change rate
	*
	* Change the ARM MPU clock rate to the rate specified on the command
	* line, if one was specified. @mpurate_ck_name should be
	* "virt_prcm_set" on OMAP2xxx and "dpll1_ck" on OMAP34xx/OMAP36xx.
	* XXX Does not handle voltage scaling - on OMAP2xxx this is currently
	* handled by the virt_prcm_set clock, but this should be handled by
	* the OPP layer. XXX This is intended to be handled by the OPP layer
	* code in the near future and should be removed from the clock code.
	* Returns -EINVAL if 'mpurate' is zero or if clk_set_rate() rejects
	* the rate, -ENOENT if the struct clk referred to by @mpurate_ck_name
	* cannot be found, or 0 upon success.
	*/
	int __init omap2_clk_switch_mpurate_at_boot(const char *mpurate_ck_name)
	{
	struct clk *mpurate_ck;
	int r;

	if (!mpurate)
	return -EINVAL;

	mpurate_ck = clk_get(NULL, mpurate_ck_name);
	if (WARN(IS_ERR(mpurate_ck), "Failed to get %s.\n", mpurate_ck_name))
	return -ENOENT;

	r = clk_set_rate(mpurate_ck, mpurate);
	if (r < 0) {
	WARN(1, "clock: %s: unable to set MPU rate to %d: %d\n",
	mpurate_ck_name, mpurate, r);
	clk_put(mpurate_ck);
	return -EINVAL;
	}

	calibrate_delay();
	clk_put(mpurate_ck);

	return 0;
	}

	/**
	* omap2_clk_print_new_rates - print summary of current clock tree rates
	* @hfclkin_ck_name: clk name for the off-chip HF oscillator
	* @core_ck_name: clk name for the on-chip CORE_CLK
	* @mpu_ck_name: clk name for the ARM MPU clock
	*
	* Prints a short message to the console with the HFCLKIN oscillator
	* rate, the rate of the CORE clock, and the rate of the ARM MPU clock.
	* Called by the boot-time MPU rate switching code. XXX This is intended
	* to be handled by the OPP layer code in the near future and should be
	* removed from the clock code. No return value.
	*/
	void __init omap2_clk_print_new_rates(const char *hfclkin_ck_name,
	const char *core_ck_name,
	const char *mpu_ck_name)
	{
	struct clk hfclkin_ck, core_ck, *mpu_ck;
	unsigned long hfclkin_rate;

	mpu_ck = clk_get(NULL, mpu_ck_name);
	if (WARN(IS_ERR(mpu_ck), "clock: failed to get %s.\n", mpu_ck_name))
	return;

	core_ck = clk_get(NULL, core_ck_name);
	if (WARN(IS_ERR(core_ck), "clock: failed to get %s.\n", core_ck_name))
	return;

	hfclkin_ck = clk_get(NULL, hfclkin_ck_name);
	if (WARN(IS_ERR(hfclkin_ck), "Failed to get %s.\n", hfclkin_ck_name))
	return;

	hfclkin_rate = clk_get_rate(hfclkin_ck);

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