1 files changed, 464 insertions, 898 deletions

diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
index e6e85b7b097b..b57ffb5a22a5 100644
--- a/arch/arm/mach-omap2/clock.c
+++ b/arch/arm/mach-omap2/clock.c
@@ -1,20 +1,19 @@
 /*
  *  linux/arch/arm/mach-omap2/clock.c
  *
- *  Copyright (C) 2005 Texas Instruments Inc.
- *  Richard Woodruff <r-woodruff2@ti.com>
- *  Created for OMAP2.
- *
- *  Cleaned up and modified to use omap shared clock framework by
- *  Tony Lindgren <tony@atomide.com>
+ *  Copyright (C) 2005-2008 Texas Instruments, Inc.
+ *  Copyright (C) 2004-2008 Nokia Corporation
  *
- *  Based on omap1 clock.c, Copyright (C) 2004 - 2005 Nokia corporation
- *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
+ *  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/module.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
@@ -22,176 +21,227 @@
 #include <linux/errno.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
+#include <asm/bitops.h>
 
 #include <asm/io.h>
 
 #include <asm/arch/clock.h>
 #include <asm/arch/sram.h>
+#include <asm/arch/cpu.h>
 #include <asm/div64.h>
 
-#include "prcm-regs.h"
 #include "memory.h"
+#include "sdrc.h"
 #include "clock.h"
+#include "prm.h"
+#include "prm-regbits-24xx.h"
+#include "cm.h"
+#include "cm-regbits-24xx.h"
+#include "cm-regbits-34xx.h"
 
-#undef DEBUG
-
-//#define DOWN_VARIABLE_DPLL 1			/* Experimental */
+#define MAX_CLOCK_ENABLE_WAIT		100000
 
-static struct prcm_config *curr_prcm_set;
-static u32 curr_perf_level = PRCM_FULL_SPEED;
-static struct clk *vclk;
-static struct clk *sclk;
+u8 cpu_mask;
 
 /*-------------------------------------------------------------------------
  * Omap2 specific clock functions
  *-------------------------------------------------------------------------*/
 
-/* Recalculate SYST_CLK */
-static void omap2_sys_clk_recalc(struct clk * clk)
+/**
+ * omap2_init_clksel_parent - set a clksel clk's parent field from the hardware
+ * @clk: OMAP clock struct ptr to use
+ *
+ * Given a pointer to a source-selectable struct clk, read the hardware
+ * register and determine what its parent is currently set to.  Update the
+ * clk->parent field with the appropriate clk ptr.
+ */
+void omap2_init_clksel_parent(struct clk *clk)
 {
-	u32 div = PRCM_CLKSRC_CTRL;
-	div &= (1 << 7) | (1 << 6);	/* Test if ext clk divided by 1 or 2 */
-	div >>= clk->rate_offset;
-	clk->rate = (clk->parent->rate / div);
-	propagate_rate(clk);
+	const struct clksel *clks;
+	const struct clksel_rate *clkr;
+	u32 r, found = 0;
+
+	if (!clk->clksel)
+		return;
+
+	r = __raw_readl(clk->clksel_reg) & clk->clksel_mask;
+	r >>= __ffs(clk->clksel_mask);
+
+	for (clks = clk->clksel; clks->parent && !found; clks++) {
+		for (clkr = clks->rates; clkr->div && !found; clkr++) {
+			if ((clkr->flags & cpu_mask) && (clkr->val == r)) {
+				if (clk->parent != clks->parent) {
+					pr_debug("clock: inited %s parent "
+						 "to %s (was %s)\n",
+						 clk->name, clks->parent->name,
+						 ((clk->parent) ?
+						  clk->parent->name : "NULL"));
+					clk->parent = clks->parent;
+				};
+				found = 1;
+			}
+		}
+	}
+
+	if (!found)
+		printk(KERN_ERR "clock: init parent: could not find "
+		       "regval %0x for clock %s\n", r,  clk->name);
+
+	return;
 }
 
-static u32 omap2_get_dpll_rate(struct clk * tclk)
+/* Returns the DPLL rate */
+u32 omap2_get_dpll_rate(struct clk *clk)
 {
 	long long dpll_clk;
-	int dpll_mult, dpll_div, amult;
+	u32 dpll_mult, dpll_div, dpll;
+	const struct dpll_data *dd;
+
+	dd = clk->dpll_data;
+	/* REVISIT: What do we return on error? */
+	if (!dd)
+		return 0;
+
+	dpll = __raw_readl(dd->mult_div1_reg);
+	dpll_mult = dpll & dd->mult_mask;
+	dpll_mult >>= __ffs(dd->mult_mask);
+	dpll_div = dpll & dd->div1_mask;
+	dpll_div >>= __ffs(dd->div1_mask);
 
-	dpll_mult = (CM_CLKSEL1_PLL >> 12) & 0x03ff;	/* 10 bits */
-	dpll_div = (CM_CLKSEL1_PLL >> 8) & 0x0f;	/* 4 bits */
-	dpll_clk = (long long)tclk->parent->rate * dpll_mult;
+	dpll_clk = (long long)clk->parent->rate * dpll_mult;
 	do_div(dpll_clk, dpll_div + 1);
-	amult = CM_CLKSEL2_PLL & 0x3;
-	dpll_clk *= amult;
 
 	return dpll_clk;
 }
 
-static void omap2_followparent_recalc(struct clk *clk)
-{
-	followparent_recalc(clk);
-}
-
-static void omap2_propagate_rate(struct clk * clk)
+/*
+ * Used for clocks that have the same value as the parent clock,
+ * divided by some factor
+ */
+void omap2_fixed_divisor_recalc(struct clk *clk)
 {
-	if (!(clk->flags & RATE_FIXED))
-		clk->rate = clk->parent->rate;
+	WARN_ON(!clk->fixed_div);
 
-	propagate_rate(clk);
-}
+	clk->rate = clk->parent->rate / clk->fixed_div;
 
-static void omap2_set_osc_ck(int enable)
-{
-	if (enable)
-		PRCM_CLKSRC_CTRL &= ~(0x3 << 3);
-	else
-		PRCM_CLKSRC_CTRL |= 0x3 << 3;
+	if (clk->flags & RATE_PROPAGATES)
+		propagate_rate(clk);
 }
 
-/* Enable an APLL if off */
-static void omap2_clk_fixed_enable(struct clk *clk)
+/**
+ * omap2_wait_clock_ready - wait for clock to enable
+ * @reg: physical address of clock IDLEST register
+ * @mask: value to mask against to determine if the clock is active
+ * @name: name of the clock (for printk)
+ *
+ * Returns 1 if the clock enabled in time, or 0 if it failed to enable
+ * in roughly MAX_CLOCK_ENABLE_WAIT microseconds.
+ */
+int omap2_wait_clock_ready(void __iomem *reg, u32 mask, const char *name)
 {
-	u32 cval, i=0;
+	int i = 0;
+	int ena = 0;
 
-	if (clk->enable_bit == 0xff)			/* Parent will do it */
-		return;
+	/*
+	 * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
+	 * 34xx reverses this, just to keep us on our toes
+	 */
+	if (cpu_mask & (RATE_IN_242X | RATE_IN_243X)) {
+		ena = mask;
+	} else if (cpu_mask & RATE_IN_343X) {
+		ena = 0;
+	}
 
-	cval = CM_CLKEN_PLL;
+	/* Wait for lock */
+	while (((__raw_readl(reg) & mask) != ena) &&
+	       (i++ < MAX_CLOCK_ENABLE_WAIT)) {
+		udelay(1);
+	}
 
-	if ((cval & (0x3 << clk->enable_bit)) == (0x3 << clk->enable_bit))
-		return;
+	if (i < MAX_CLOCK_ENABLE_WAIT)
+		pr_debug("Clock %s stable after %d loops\n", name, i);
+	else
+		printk(KERN_ERR "Clock %s didn't enable in %d tries\n",
+		       name, MAX_CLOCK_ENABLE_WAIT);
 
-	cval &= ~(0x3 << clk->enable_bit);
-	cval |= (0x3 << clk->enable_bit);
-	CM_CLKEN_PLL = cval;
 
-	if (clk == &apll96_ck)
-		cval = (1 << 8);
-	else if (clk == &apll54_ck)
-		cval = (1 << 6);
+	return (i < MAX_CLOCK_ENABLE_WAIT) ? 1 : 0;
+};
 
-	while (!(CM_IDLEST_CKGEN & cval)) {		/* Wait for lock */
-		++i;
-		udelay(1);
-		if (i == 100000) {
-			printk(KERN_ERR "Clock %s didn't lock\n", clk->name);
-			break;
-		}
-	}
-}
 
+/*
+ * 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
+ */
 static void omap2_clk_wait_ready(struct clk *clk)
 {
-	unsigned long reg, other_reg, st_reg;
+	void __iomem *reg, *other_reg, *st_reg;
 	u32 bit;
-	int i;
-
-	reg = (unsigned long) clk->enable_reg;
-	if (reg == (unsigned long) &CM_FCLKEN1_CORE ||
-	    reg == (unsigned long) &CM_FCLKEN2_CORE)
-		other_reg = (reg & ~0xf0) | 0x10;
-	else if (reg == (unsigned long) &CM_ICLKEN1_CORE ||
-		 reg == (unsigned long) &CM_ICLKEN2_CORE)
-		other_reg = (reg & ~0xf0) | 0x00;
+
+	/*
+	 * REVISIT: This code is pretty ugly.  It would be nice to generalize
+	 * it and pull it into struct clk itself somehow.
+	 */
+	reg = clk->enable_reg;
+	if ((((u32)reg & 0xff) >= CM_FCLKEN1) &&
+	    (((u32)reg & 0xff) <= OMAP24XX_CM_FCLKEN2))
+		other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x10); /* CM_ICLKEN* */
+	else if ((((u32)reg & 0xff) >= CM_ICLKEN1) &&
+		 (((u32)reg & 0xff) <= OMAP24XX_CM_ICLKEN4))
+		other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x00); /* CM_FCLKEN* */
 	else
 		return;
 
+	/* REVISIT: What are the appropriate exclusions for 34XX? */
 	/* No check for DSS or cam clocks */
-	if ((reg & 0x0f) == 0) {
-		if (clk->enable_bit <= 1 || clk->enable_bit == 31)
+	if (cpu_is_omap24xx() && ((u32)reg & 0x0f) == 0) { /* CM_{F,I}CLKEN1 */
+		if (clk->enable_bit == OMAP24XX_EN_DSS2_SHIFT ||
+		    clk->enable_bit == OMAP24XX_EN_DSS1_SHIFT ||
+		    clk->enable_bit == OMAP24XX_EN_CAM_SHIFT)
 			return;
 	}
 
+	/* REVISIT: What are the appropriate exclusions for 34XX? */
+	/* OMAP3: ignore DSS-mod clocks */
+	if (cpu_is_omap34xx() &&
+	    (((u32)reg & ~0xff) == (u32)OMAP_CM_REGADDR(OMAP3430_DSS_MOD, 0)))
+		return;
+
 	/* Check if both functional and interface clocks
 	 * are running. */
 	bit = 1 << clk->enable_bit;
 	if (!(__raw_readl(other_reg) & bit))
 		return;
-	st_reg = (other_reg & ~0xf0) | 0x20;
-	i = 0;
-	while (!(__raw_readl(st_reg) & bit)) {
-		i++;
-		if (i == 100000) {
-			printk(KERN_ERR "Timeout enabling clock %s\n", clk->name);
-			break;
-		}
-	}
-	if (i)
-		pr_debug("Clock %s stable after %d loops\n", clk->name, i);
+	st_reg = (void __iomem *)(((u32)other_reg & ~0xf0) | 0x20); /* CM_IDLEST* */
+
+	omap2_wait_clock_ready(st_reg, bit, clk->name);
 }
 
 /* Enables clock without considering parent dependencies or use count
  * REVISIT: Maybe change this to use clk->enable like on omap1?
  */
-static int _omap2_clk_enable(struct clk * clk)
+int _omap2_clk_enable(struct clk *clk)
 {
 	u32 regval32;
 
-	if (clk->flags & ALWAYS_ENABLED)
+	if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
 		return 0;
 
-	if (unlikely(clk == &osc_ck)) {
-		omap2_set_osc_ck(1);
-		return 0;
-	}
+	if (clk->enable)
+		return clk->enable(clk);
 
 	if (unlikely(clk->enable_reg == 0)) {
 		printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 		       clk->name);
-		return 0;
-	}
-
-	if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
-		omap2_clk_fixed_enable(clk);
-		return 0;
+		return 0; /* REVISIT: -EINVAL */
 	}
 
 	regval32 = __raw_readl(clk->enable_reg);
-	regval32 |= (1 << clk->enable_bit);
+	if (clk->flags & INVERT_ENABLE)
+		regval32 &= ~(1 << clk->enable_bit);
+	else
+		regval32 |= (1 << clk->enable_bit);
 	__raw_writel(regval32, clk->enable_reg);
 	wmb();
 
@@ -200,44 +250,48 @@ static int _omap2_clk_enable(struct clk * clk)
 	return 0;
 }
 
-/* Stop APLL */
-static void omap2_clk_fixed_disable(struct clk *clk)
-{
-	u32 cval;
-
-	if(clk->enable_bit == 0xff)		/* let parent off do it */
-		return;
-
-	cval = CM_CLKEN_PLL;
-	cval &= ~(0x3 << clk->enable_bit);
-	CM_CLKEN_PLL = cval;
-}
-
 /* Disables clock without considering parent dependencies or use count */
-static void _omap2_clk_disable(struct clk *clk)
+void _omap2_clk_disable(struct clk *clk)
 {
 	u32 regval32;
 
-	if (unlikely(clk == &osc_ck)) {
-		omap2_set_osc_ck(0);
+	if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
 		return;
-	}
 
-	if (clk->enable_reg == 0)
+	if (clk->disable) {
+		clk->disable(clk);
 		return;
+	}
 
-	if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
-		omap2_clk_fixed_disable(clk);
+	if (clk->enable_reg == 0) {
+		/*
+		 * 'Independent' here refers to a clock which is not
+		 * controlled by its parent.
+		 */
+		printk(KERN_ERR "clock: clk_disable called on independent "
+		       "clock %s which has no enable_reg\n", clk->name);
 		return;
 	}
 
 	regval32 = __raw_readl(clk->enable_reg);
-	regval32 &= ~(1 << clk->enable_bit);
+	if (clk->flags & INVERT_ENABLE)
+		regval32 |= (1 << clk->enable_bit);
+	else
+		regval32 &= ~(1 << clk->enable_bit);
 	__raw_writel(regval32, clk->enable_reg);
 	wmb();
 }
 
-static int omap2_clk_enable(struct clk *clk)
+void omap2_clk_disable(struct clk *clk)
+{
+	if (clk->usecount > 0 && !(--clk->usecount)) {
+		_omap2_clk_disable(clk);
+		if (likely((u32)clk->parent))
+			omap2_clk_disable(clk->parent);
+	}
+}
+
+int omap2_clk_enable(struct clk *clk)
 {
 	int ret = 0;
 
@@ -261,519 +315,314 @@ static int omap2_clk_enable(struct clk *clk)
 	return ret;
 }
 
-static void omap2_clk_disable(struct clk *clk)
-{
-	if (clk->usecount > 0 && !(--clk->usecount)) {
-		_omap2_clk_disable(clk);
-		if (likely((u32)clk->parent))
-			omap2_clk_disable(clk->parent);
-	}
-}
-
-/*
- * Uses the current prcm set to tell if a rate is valid.
- * You can go slower, but not faster within a given rate set.
- */
-static u32 omap2_dpll_round_rate(unsigned long target_rate)
-{
-	u32 high, low;
-
-	if ((CM_CLKSEL2_PLL & 0x3) == 1) {	/* DPLL clockout */
-		high = curr_prcm_set->dpll_speed * 2;
-		low = curr_prcm_set->dpll_speed;
-	} else {				/* DPLL clockout x 2 */
-		high = curr_prcm_set->dpll_speed;
-		low = curr_prcm_set->dpll_speed / 2;
-	}
-
-#ifdef DOWN_VARIABLE_DPLL
-	if (target_rate > high)
-		return high;
-	else
-		return target_rate;
-#else
-	if (target_rate > low)
-		return high;
-	else
-		return low;
-#endif
-
-}
-
 /*
  * Used for clocks that are part of CLKSEL_xyz governed clocks.
  * REVISIT: Maybe change to use clk->enable() functions like on omap1?
  */
-static void omap2_clksel_recalc(struct clk * clk)
+void omap2_clksel_recalc(struct clk *clk)
 {
-	u32 fixed = 0, div = 0;
+	u32 div = 0;
 
-	if (clk == &dpll_ck) {
-		clk->rate = omap2_get_dpll_rate(clk);
-		fixed = 1;
-		div = 0;
-	}
+	pr_debug("clock: recalc'ing clksel clk %s\n", clk->name);
 
-	if (clk == &iva1_mpu_int_ifck) {
-		div = 2;
-		fixed = 1;
-	}
-
-	if ((clk == &dss1_fck) && ((CM_CLKSEL1_CORE & (0x1f << 8)) == 0)) {
-		clk->rate = sys_ck.rate;
+	div = omap2_clksel_get_divisor(clk);
+	if (div == 0)
 		return;
-	}
 
-	if (!fixed) {
-		div = omap2_clksel_get_divisor(clk);
-		if (div == 0)
-			return;
-	}
+	if (unlikely(clk->rate == clk->parent->rate / div))
+		return;
+	clk->rate = clk->parent->rate / div;
 
-	if (div != 0) {
-		if (unlikely(clk->rate == clk->parent->rate / div))
-			return;
-		clk->rate = clk->parent->rate / div;
-	}
+	pr_debug("clock: new clock rate is %ld (div %d)\n", clk->rate, div);
 
 	if (unlikely(clk->flags & RATE_PROPAGATES))
 		propagate_rate(clk);
 }
 
-/*
- * Finds best divider value in an array based on the source and target
- * rates. The divider array must be sorted with smallest divider first.
+/**
+ * omap2_get_clksel_by_parent - return clksel struct for a given clk & parent
+ * @clk: OMAP struct clk ptr to inspect
+ * @src_clk: OMAP struct clk ptr of the parent clk to search for
+ *
+ * Scan the struct clksel array associated with the clock to find
+ * the element associated with the supplied parent clock address.
+ * Returns a pointer to the struct clksel on success or NULL on error.
  */
-static inline u32 omap2_divider_from_table(u32 size, u32 *div_array,
-					   u32 src_rate, u32 tgt_rate)
+const struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
+						struct clk *src_clk)
 {
-	int i, test_rate;
+	const struct clksel *clks;
 
-	if (div_array == NULL)
-		return ~1;
+	if (!clk->clksel)
+		return NULL;
 
-	for (i=0; i < size; i++) {
-		test_rate = src_rate / *div_array;
-		if (test_rate <= tgt_rate)
-			return *div_array;
-		++div_array;
+	for (clks = clk->clksel; clks->parent; clks++) {
+		if (clks->parent == src_clk)
+			break; /* Found the requested parent */
 	}
 
-	return ~0;	/* No acceptable divider */
+	if (!clks->parent) {
+		printk(KERN_ERR "clock: Could not find parent clock %s in "
+		       "clksel array of clock %s\n", src_clk->name,
+		       clk->name);
+		return NULL;
+	}
+
+	return clks;
 }
 
-/*
- * Find divisor for the given clock and target rate.
+/**
+ * omap2_clksel_round_rate_div - find divisor for the given clock and rate
+ * @clk: OMAP struct clk to use
+ * @target_rate: desired clock rate
+ * @new_div: ptr to where we should store the divisor
  *
+ * Finds 'best' divider value in an array based on the source and target
+ * rates.  The divider array must be sorted with smallest divider first.
  * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
  * they are only settable as part of virtual_prcm set.
+ *
+ * Returns the rounded clock rate or returns 0xffffffff on error.
  */
-static u32 omap2_clksel_round_rate(struct clk *tclk, u32 target_rate,
-	u32 *new_div)
+u32 omap2_clksel_round_rate_div(struct clk *clk, unsigned long target_rate,
+				u32 *new_div)
 {
-	u32 gfx_div[] = {2, 3, 4};
-	u32 sysclkout_div[] = {1, 2, 4, 8, 16};
-	u32 dss1_div[] = {1, 2, 3, 4, 5, 6, 8, 9, 12, 16};
-	u32 vylnq_div[] = {1, 2, 3, 4, 6, 8, 9, 12, 16, 18};
-	u32 best_div = ~0, asize = 0;
-	u32 *div_array = NULL;
-
-	switch (tclk->flags & SRC_RATE_SEL_MASK) {
-	case CM_GFX_SEL1:
-		asize = 3;
-		div_array = gfx_div;
-		break;
-	case CM_PLL_SEL1:
-		return omap2_dpll_round_rate(target_rate);
-	case CM_SYSCLKOUT_SEL1:
-		asize = 5;
-		div_array = sysclkout_div;
-		break;
-	case CM_CORE_SEL1:
-		if(tclk == &dss1_fck){
-			if(tclk->parent == &core_ck){
-				asize = 10;
-				div_array = dss1_div;
-			} else {
-				*new_div = 0; /* fixed clk */
-				return(tclk->parent->rate);
-			}
-		} else if((tclk == &vlynq_fck) && cpu_is_omap2420()){
-			if(tclk->parent == &core_ck){
-				asize = 10;
-				div_array = vylnq_div;
-			} else {
-				*new_div = 0; /* fixed clk */
-				return(tclk->parent->rate);
-			}
-		}
-		break;
+	unsigned long test_rate;
+	const struct clksel *clks;
+	const struct clksel_rate *clkr;
+	u32 last_div = 0;
+
+	printk(KERN_INFO "clock: clksel_round_rate_div: %s target_rate %ld\n",
+	       clk->name, target_rate);
+
+	*new_div = 1;
+
+	clks = omap2_get_clksel_by_parent(clk, clk->parent);
+	if (clks == NULL)
+		return ~0;
+
+	for (clkr = clks->rates; clkr->div; clkr++) {
+		if (!(clkr->flags & cpu_mask))
+		    continue;
+
+		/* Sanity check */
+		if (clkr->div <= last_div)
+			printk(KERN_ERR "clock: clksel_rate table not sorted "
+			       "for clock %s", clk->name);
+
+		last_div = clkr->div;
+
+		test_rate = clk->parent->rate / clkr->div;
+
+		if (test_rate <= target_rate)
+			break; /* found it */
 	}
 
-	best_div = omap2_divider_from_table(asize, div_array,
-	 tclk->parent->rate, target_rate);
-	if (best_div == ~0){
-		*new_div = 1;
-		return best_div; /* signal error */
+	if (!clkr->div) {
+		printk(KERN_ERR "clock: Could not find divisor for target "
+		       "rate %ld for clock %s parent %s\n", target_rate,
+		       clk->name, clk->parent->name);
+		return ~0;
 	}
 
-	*new_div = best_div;
-	return (tclk->parent->rate / best_div);
+	*new_div = clkr->div;
+
+	printk(KERN_INFO "clock: new_div = %d, new_rate = %ld\n", *new_div,
+	       (clk->parent->rate / clkr->div));
+
+	return (clk->parent->rate / clkr->div);
 }
 
-/* Given a clock and a rate apply a clock specific rounding function */
-static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
+/**
+ * omap2_clksel_round_rate - find rounded rate for the given clock and rate
+ * @clk: OMAP struct clk to use
+ * @target_rate: desired clock rate
+ *
+ * Compatibility wrapper for OMAP clock framework
+ * Finds best target rate based on the source clock and possible dividers.
+ * rates. The divider array must be sorted with smallest divider first.
+ * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
+ * they are only settable as part of virtual_prcm set.
+ *
+ * Returns the rounded clock rate or returns 0xffffffff on error.
+ */
+long omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate)
 {
-	u32 new_div = 0;
-	int valid_rate;
+	u32 new_div;
 
-	if (clk->flags & RATE_FIXED)
-		return clk->rate;
+	return omap2_clksel_round_rate_div(clk, target_rate, &new_div);
+}
 
-	if (clk->flags & RATE_CKCTL) {
-		valid_rate = omap2_clksel_round_rate(clk, rate, &new_div);
-		return valid_rate;
-	}
 
+/* Given a clock and a rate apply a clock specific rounding function */
+long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
+{
 	if (clk->round_rate != 0)
 		return clk->round_rate(clk, rate);
 
+	if (clk->flags & RATE_FIXED)
+		printk(KERN_ERR "clock: generic omap2_clk_round_rate called "
+		       "on fixed-rate clock %s\n", clk->name);
+
 	return clk->rate;
 }
 
-/*
- * Check the DLL lock state, and return tue if running in unlock mode.
- * This is needed to compensate for the shifted DLL value in unlock mode.
+/**
+ * omap2_clksel_to_divisor() - turn clksel field value into integer divider
+ * @clk: OMAP struct clk to use
+ * @field_val: register field value to find
+ *
+ * Given a struct clk of a rate-selectable clksel clock, and a register field
+ * value to search for, find the corresponding clock divisor.  The register
+ * field value should be pre-masked and shifted down so the LSB is at bit 0
+ * before calling.  Returns 0 on error
  */
-static u32 omap2_dll_force_needed(void)
+u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val)
 {
-	u32 dll_state = SDRC_DLLA_CTRL;		/* dlla and dllb are a set */
+	const struct clksel *clks;
+	const struct clksel_rate *clkr;
 
-	if ((dll_state & (1 << 2)) == (1 << 2))
-		return 1;
-	else
+	clks = omap2_get_clksel_by_parent(clk, clk->parent);
+	if (clks == NULL)
 		return 0;
-}
 
-static u32 omap2_reprogram_sdrc(u32 level, u32 force)
-{
-	u32 slow_dll_ctrl, fast_dll_ctrl, m_type;
-	u32 prev = curr_perf_level, flags;
-
-	if ((curr_perf_level == level) && !force)
-		return prev;
-
-	m_type = omap2_memory_get_type();
-	slow_dll_ctrl = omap2_memory_get_slow_dll_ctrl();
-	fast_dll_ctrl = omap2_memory_get_fast_dll_ctrl();
-
-	if (level == PRCM_HALF_SPEED) {
-		local_irq_save(flags);
-		PRCM_VOLTSETUP = 0xffff;
-		omap2_sram_reprogram_sdrc(PRCM_HALF_SPEED,
-					  slow_dll_ctrl, m_type);
-		curr_perf_level = PRCM_HALF_SPEED;
-		local_irq_restore(flags);
+	for (clkr = clks->rates; clkr->div; clkr++) {
+		if ((clkr->flags & cpu_mask) && (clkr->val == field_val))
+			break;
 	}
-	if (level == PRCM_FULL_SPEED) {
-		local_irq_save(flags);
-		PRCM_VOLTSETUP = 0xffff;
-		omap2_sram_reprogram_sdrc(PRCM_FULL_SPEED,
-					  fast_dll_ctrl, m_type);
-		curr_perf_level = PRCM_FULL_SPEED;
-		local_irq_restore(flags);
+
+	if (!clkr->div) {
+		printk(KERN_ERR "clock: Could not find fieldval %d for "
+		       "clock %s parent %s\n", field_val, clk->name,
+		       clk->parent->name);
+		return 0;
 	}
 
-	return prev;
+	return clkr->div;
 }
 
-static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
+/**
+ * omap2_divisor_to_clksel() - turn clksel integer divisor into a field value
+ * @clk: OMAP struct clk to use
+ * @div: integer divisor to search for
+ *
+ * Given a struct clk of a rate-selectable clksel clock, and a clock divisor,
+ * find the corresponding register field value.  The return register value is
+ * the value before left-shifting.  Returns 0xffffffff on error
+ */
+u32 omap2_divisor_to_clksel(struct clk *clk, u32 div)
 {
-	u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
-	u32 bypass = 0;
-	struct prcm_config tmpset;
-	int ret = -EINVAL;
+	const struct clksel *clks;
+	const struct clksel_rate *clkr;
 
-	local_irq_save(flags);
-	cur_rate = omap2_get_dpll_rate(&dpll_ck);
-	mult = CM_CLKSEL2_PLL & 0x3;
-
-	if ((rate == (cur_rate / 2)) && (mult == 2)) {
-		omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
-	} else if ((rate == (cur_rate * 2)) && (mult == 1)) {
-		omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
-	} else if (rate != cur_rate) {
-		valid_rate = omap2_dpll_round_rate(rate);
-		if (valid_rate != rate)
-			goto dpll_exit;
-
-		if ((CM_CLKSEL2_PLL & 0x3) == 1)
-			low = curr_prcm_set->dpll_speed;
-		else
-			low = curr_prcm_set->dpll_speed / 2;
-
-		tmpset.cm_clksel1_pll = CM_CLKSEL1_PLL;
-		tmpset.cm_clksel1_pll &= ~(0x3FFF << 8);
-		div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
-		tmpset.cm_clksel2_pll = CM_CLKSEL2_PLL;
-		tmpset.cm_clksel2_pll &= ~0x3;
-		if (rate > low) {
-			tmpset.cm_clksel2_pll |= 0x2;
-			mult = ((rate / 2) / 1000000);
-			done_rate = PRCM_FULL_SPEED;
-		} else {
-			tmpset.cm_clksel2_pll |= 0x1;
-			mult = (rate / 1000000);
-			done_rate = PRCM_HALF_SPEED;
-		}
-		tmpset.cm_clksel1_pll |= ((div << 8) | (mult << 12));
-
-		/* Worst case */
-		tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
-
-		if (rate == curr_prcm_set->xtal_speed)	/* If asking for 1-1 */
-			bypass = 1;
+	/* should never happen */
+	WARN_ON(div == 0);
 
-		omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1); /* For init_mem */
-
-		/* Force dll lock mode */
-		omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
-			       bypass);
+	clks = omap2_get_clksel_by_parent(clk, clk->parent);
+	if (clks == NULL)
+		return 0;
 
-		/* Errata: ret dll entry state */
-		omap2_init_memory_params(omap2_dll_force_needed());
-		omap2_reprogram_sdrc(done_rate, 0);
+	for (clkr = clks->rates; clkr->div; clkr++) {
+		if ((clkr->flags & cpu_mask) && (clkr->div == div))
+			break;
 	}
-	omap2_clksel_recalc(&dpll_ck);
-	ret = 0;
 
-dpll_exit:
-	local_irq_restore(flags);
-	return(ret);
-}
+	if (!clkr->div) {
+		printk(KERN_ERR "clock: Could not find divisor %d for "
+		       "clock %s parent %s\n", div, clk->name,
+		       clk->parent->name);
+		return 0;
+	}
 
-/* Just return the MPU speed */
-static void omap2_mpu_recalc(struct clk * clk)
-{
-	clk->rate = curr_prcm_set->mpu_speed;
+	return clkr->val;
 }
 
-/*
- * Look for a rate equal or less than the target rate given a configuration set.
+/**
+ * omap2_get_clksel - find clksel register addr & field mask for a clk
+ * @clk: struct clk to use
+ * @field_mask: ptr to u32 to store the register field mask
  *
- * What's not entirely clear is "which" field represents the key field.
- * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
- * just uses the ARM rates.
+ * Returns the address of the clksel register upon success or NULL on error.
  */
-static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
+void __iomem *omap2_get_clksel(struct clk *clk, u32 *field_mask)
 {
-	struct prcm_config * ptr;
-	long highest_rate;
-
-	if (clk != &virt_prcm_set)
-		return -EINVAL;
-
-	highest_rate = -EINVAL;
-
-	for (ptr = rate_table; ptr->mpu_speed; ptr++) {
-		if (ptr->xtal_speed != sys_ck.rate)
-			continue;
+	if (unlikely((clk->clksel_reg == 0) || (clk->clksel_mask == 0)))
+		return NULL;
 
-		highest_rate = ptr->mpu_speed;
+	*field_mask = clk->clksel_mask;
 
-		/* Can check only after xtal frequency check */
-		if (ptr->mpu_speed <= rate)
-			break;
-	}
-	return highest_rate;
+	return clk->clksel_reg;
 }
 
-/*
- * omap2_convert_field_to_div() - turn field value into integer divider
+/**
+ * omap2_clksel_get_divisor - get current divider applied to parent clock.
+ * @clk: OMAP struct clk to use.
+ *
+ * Returns the integer divisor upon success or 0 on error.
  */
-static u32 omap2_clksel_to_divisor(u32 div_sel, u32 field_val)
+u32 omap2_clksel_get_divisor(struct clk *clk)
 {
-	u32 i;
-	u32 clkout_array[] = {1, 2, 4, 8, 16};
+	u32 field_mask, field_val;
+	void __iomem *div_addr;
 
-	if ((div_sel & SRC_RATE_SEL_MASK) == CM_SYSCLKOUT_SEL1) {
-		for (i = 0; i < 5; i++) {
-			if (field_val == i)
-				return clkout_array[i];
-		}
-		return ~0;
-	} else
-		return field_val;
+	div_addr = omap2_get_clksel(clk, &field_mask);
+	if (div_addr == 0)
+		return 0;
+
+	field_val = __raw_readl(div_addr) & field_mask;
+	field_val >>= __ffs(field_mask);
+
+	return omap2_clksel_to_divisor(clk, field_val);
 }
 
-/*
- * Returns the CLKSEL divider register value
- * REVISIT: This should be cleaned up to work nicely with void __iomem *
- */
-static u32 omap2_get_clksel(u32 *div_sel, u32 *field_mask,
-			    struct clk *clk)
+int omap2_clksel_set_rate(struct clk *clk, unsigned long rate)
 {
-	int ret = ~0;
-	u32 reg_val, div_off;
-	u32 div_addr = 0;
-	u32 mask = ~0;
-
-	div_off = clk->rate_offset;
-
-	switch ((*div_sel & SRC_RATE_SEL_MASK)) {
-	case CM_MPU_SEL1:
-		div_addr = (u32)&CM_CLKSEL_MPU;
-		mask = 0x1f;
-		break;
-	case CM_DSP_SEL1:
-		div_addr = (u32)&CM_CLKSEL_DSP;
-		if (cpu_is_omap2420()) {
-			if ((div_off == 0) || (div_off == 8))
-				mask = 0x1f;
-			else if (div_off == 5)
-				mask = 0x3;
-		} else if (cpu_is_omap2430()) {
-			if (div_off == 0)
-				mask = 0x1f;
-			else if (div_off == 5)
-				mask = 0x3;
-		}
-		break;
-	case CM_GFX_SEL1:
-		div_addr = (u32)&CM_CLKSEL_GFX;
-		if (div_off == 0)
-			mask = 0x7;
-		break;
-	case CM_MODEM_SEL1:
-		div_addr = (u32)&CM_CLKSEL_MDM;
-		if (div_off == 0)
-			mask = 0xf;
-		break;
-	case CM_SYSCLKOUT_SEL1:
-		div_addr = (u32)&PRCM_CLKOUT_CTRL;
-		if ((div_off == 3) || (div_off == 11))
-			mask= 0x3;
-		break;
-	case CM_CORE_SEL1:
-		div_addr = (u32)&CM_CLKSEL1_CORE;
-		switch (div_off) {
-		case 0:					/* l3 */
-		case 8:					/* dss1 */
-		case 15:				/* vylnc-2420 */
-		case 20:				/* ssi */
-			mask = 0x1f; break;
-		case 5:					/* l4 */
-			mask = 0x3; break;
-		case 13:				/* dss2 */
-			mask = 0x1; break;
-		case 25:				/* usb */
-			mask = 0x7; break;
-		}
-	}
+	u32 field_mask, field_val, reg_val, validrate, new_div = 0;
+	void __iomem *div_addr;
 
-	*field_mask = mask;
+	validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
+	if (validrate != rate)
+		return -EINVAL;
 
-	if (unlikely(mask == ~0))
-		div_addr = 0;
+	div_addr = omap2_get_clksel(clk, &field_mask);
+	if (div_addr == 0)
+		return -EINVAL;
 
-	*div_sel = div_addr;
+	field_val = omap2_divisor_to_clksel(clk, new_div);
+	if (field_val == ~0)
+		return -EINVAL;
 
-	if (unlikely(div_addr == 0))
-		return ret;
+	reg_val = __raw_readl(div_addr);
+	reg_val &= ~field_mask;
+	reg_val |= (field_val << __ffs(field_mask));
+	__raw_writel(reg_val, div_addr);
+	wmb();
 
-	/* Isolate field */
-	reg_val = __raw_readl((void __iomem *)div_addr) & (mask << div_off);
+	clk->rate = clk->parent->rate / new_div;
 
-	/* Normalize back to divider value */
-	reg_val >>= div_off;
+	if (clk->flags & DELAYED_APP && cpu_is_omap24xx()) {
+		__raw_writel(OMAP24XX_VALID_CONFIG, OMAP24XX_PRCM_CLKCFG_CTRL);
+		wmb();
+	}
 
-	return reg_val;
+	return 0;
 }
 
-/*
- * Return divider to be applied to parent clock.
- * Return 0 on error.
- */
-static u32 omap2_clksel_get_divisor(struct clk *clk)
-{
-	int ret = 0;
-	u32 div, div_sel, div_off, field_mask, field_val;
-
-	/* isolate control register */
-	div_sel = (SRC_RATE_SEL_MASK & clk->flags);
-
-	div_off = clk->rate_offset;
-	field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
-	if (div_sel == 0)
-		return ret;
-
-	div_sel = (SRC_RATE_SEL_MASK & clk->flags);
-	div = omap2_clksel_to_divisor(div_sel, field_val);
-
-	return div;
-}
 
 /* Set the clock rate for a clock source */
-static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
-
+int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
 {
 	int ret = -EINVAL;
-	void __iomem * reg;
-	u32 div_sel, div_off, field_mask, field_val, reg_val, validrate;
-	u32 new_div = 0;
-
-	if (!(clk->flags & CONFIG_PARTICIPANT) && (clk->flags & RATE_CKCTL)) {
-		if (clk == &dpll_ck)
-			return omap2_reprogram_dpll(clk, rate);
-
-		/* Isolate control register */
-		div_sel = (SRC_RATE_SEL_MASK & clk->flags);
-		div_off = clk->rate_offset;
-
-		validrate = omap2_clksel_round_rate(clk, rate, &new_div);
-		if (validrate != rate)
-			return(ret);
 
-		field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
-		if (div_sel == 0)
-			return ret;
-
-		if (clk->flags & CM_SYSCLKOUT_SEL1) {
-			switch (new_div) {
-			case 16:
-				field_val = 4;
-				break;
-			case 8:
-				field_val = 3;
-				break;
-			case 4:
-				field_val = 2;
-				break;
-			case 2:
-				field_val = 1;
-				break;
-			case 1:
-				field_val = 0;
-				break;
-			}
-		} else
-			field_val = new_div;
+	pr_debug("clock: set_rate for clock %s to rate %ld\n", clk->name, rate);
 
-		reg = (void __iomem *)div_sel;
-
-		reg_val = __raw_readl(reg);
-		reg_val &= ~(field_mask << div_off);
-		reg_val |= (field_val << div_off);
-		__raw_writel(reg_val, reg);
-		wmb();
-		clk->rate = clk->parent->rate / field_val;
+	/* CONFIG_PARTICIPANT clocks are changed only in sets via the
+	   rate table mechanism, driven by mpu_speed  */
+	if (clk->flags & CONFIG_PARTICIPANT)
+		return -EINVAL;
 
-		if (clk->flags & DELAYED_APP) {
-			__raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
-			wmb();
-		}
-		ret = 0;
-	} else if (clk->set_rate != 0)
+	/* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
+	if (clk->set_rate != 0)
 		ret = clk->set_rate(clk, rate);
 
 	if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
@@ -782,242 +631,92 @@ static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
 	return ret;
 }
 
-/* Converts encoded control register address into a full address */
-static u32 omap2_get_src_field(u32 *type_to_addr, u32 reg_offset,
-			       struct clk *src_clk, u32 *field_mask)
-{
-	u32 val = ~0, src_reg_addr = 0, mask = 0;
-
-	/* Find target control register.*/
-	switch ((*type_to_addr & SRC_RATE_SEL_MASK)) {
-	case CM_CORE_SEL1:
-		src_reg_addr = (u32)&CM_CLKSEL1_CORE;
-		if (reg_offset == 13) {			/* DSS2_fclk */
-			mask = 0x1;
-			if (src_clk == &sys_ck)
-				val = 0;
-			if (src_clk == &func_48m_ck)
-				val = 1;
-		} else if (reg_offset == 8) {		/* DSS1_fclk */
-			mask = 0x1f;
-			if (src_clk == &sys_ck)
-				val = 0;
-			else if (src_clk == &core_ck)	/* divided clock */
-				val = 0x10;		/* rate needs fixing */
-		} else if ((reg_offset == 15) && cpu_is_omap2420()){ /*vlnyq*/
-			mask = 0x1F;
-			if(src_clk == &func_96m_ck)
-				val = 0;
-			else if (src_clk == &core_ck)
-				val = 0x10;
-		}
-		break;
-	case CM_CORE_SEL2:
-		src_reg_addr = (u32)&CM_CLKSEL2_CORE;
-		mask = 0x3;
-		if (src_clk == &func_32k_ck)
-			val = 0x0;
-		if (src_clk == &sys_ck)
-			val = 0x1;
-		if (src_clk == &alt_ck)
-			val = 0x2;
-		break;
-	case CM_WKUP_SEL1:
-		src_reg_addr = (u32)&CM_CLKSEL_WKUP;
-		mask = 0x3;
-		if (src_clk == &func_32k_ck)
-			val = 0x0;
-		if (src_clk == &sys_ck)
-			val = 0x1;
-		if (src_clk == &alt_ck)
-			val = 0x2;
-		break;
-	case CM_PLL_SEL1:
-		src_reg_addr = (u32)&CM_CLKSEL1_PLL;
-		mask = 0x1;
-		if (reg_offset == 0x3) {
-			if (src_clk == &apll96_ck)
-				val = 0;
-			if (src_clk == &alt_ck)
-				val = 1;
-		}
-		else if (reg_offset == 0x5) {
-			if (src_clk == &apll54_ck)
-				val = 0;
-			if (src_clk == &alt_ck)
-				val = 1;
-		}
-		break;
-	case CM_PLL_SEL2:
-		src_reg_addr = (u32)&CM_CLKSEL2_PLL;
-		mask = 0x3;
-		if (src_clk == &func_32k_ck)
-			val = 0x0;
-		if (src_clk == &dpll_ck)
-			val = 0x2;
-		break;
-	case CM_SYSCLKOUT_SEL1:
-		src_reg_addr = (u32)&PRCM_CLKOUT_CTRL;
-		mask = 0x3;
-		if (src_clk == &dpll_ck)
-			val = 0;
-		if (src_clk == &sys_ck)
-			val = 1;
-		if (src_clk == &func_96m_ck)
-			val = 2;
-		if (src_clk == &func_54m_ck)
-			val = 3;
-		break;
-	}
-
-	if (val == ~0)			/* Catch errors in offset */
-		*type_to_addr = 0;
-	else
-		*type_to_addr = src_reg_addr;
-	*field_mask = mask;
-
-	return val;
-}
-
-static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
+/*
+ * Converts encoded control register address into a full address
+ * On error, *src_addr will be returned as 0.
+ */
+static u32 omap2_clksel_get_src_field(void __iomem **src_addr,
+				      struct clk *src_clk, u32 *field_mask,
+				      struct clk *clk, u32 *parent_div)
 {
-	void __iomem * reg;
-	u32 src_sel, src_off, field_val, field_mask, reg_val, rate;
-	int ret = -EINVAL;
-
-	if (unlikely(clk->flags & CONFIG_PARTICIPANT))
-		return ret;
-
-	if (clk->flags & SRC_SEL_MASK) {	/* On-chip SEL collection */
-		src_sel = (SRC_RATE_SEL_MASK & clk->flags);
-		src_off = clk->src_offset;
-
-		if (src_sel == 0)
-			goto set_parent_error;
-
-		field_val = omap2_get_src_field(&src_sel, src_off, new_parent,
-						&field_mask);
-
-		reg = (void __iomem *)src_sel;
-
-		if (clk->usecount > 0)
-			_omap2_clk_disable(clk);
-
-		/* Set new source value (previous dividers if any in effect) */
-		reg_val = __raw_readl(reg) & ~(field_mask << src_off);
-		reg_val |= (field_val << src_off);
-		__raw_writel(reg_val, reg);
-		wmb();
+	const struct clksel *clks;
+	const struct clksel_rate *clkr;
 
-		if (clk->flags & DELAYED_APP) {
-			__raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
-			wmb();
-		}
-		if (clk->usecount > 0)
-			_omap2_clk_enable(clk);
-
-		clk->parent = new_parent;
+	*parent_div = 0;
+	*src_addr = 0;
 
-		/* SRC_RATE_SEL_MASK clocks follow their parents rates.*/
-		if ((new_parent == &core_ck) && (clk == &dss1_fck))
-			clk->rate = new_parent->rate / 0x10;
-		else
-			clk->rate = new_parent->rate;
+	clks = omap2_get_clksel_by_parent(clk, src_clk);
+	if (clks == NULL)
+		return 0;
 
-		if (unlikely(clk->flags & RATE_PROPAGATES))
-			propagate_rate(clk);
+	for (clkr = clks->rates; clkr->div; clkr++) {
+		if (clkr->flags & (cpu_mask | DEFAULT_RATE))
+			break; /* Found the default rate for this platform */
+	}
 
+	if (!clkr->div) {
+		printk(KERN_ERR "clock: Could not find default rate for "
+		       "clock %s parent %s\n", clk->name,
+		       src_clk->parent->name);
 		return 0;
-	} else {
-		clk->parent = new_parent;
-		rate = new_parent->rate;
-		omap2_clk_set_rate(clk, rate);
-		ret = 0;
 	}
 
- set_parent_error:
-	return ret;
+	/* Should never happen.  Add a clksel mask to the struct clk. */
+	WARN_ON(clk->clksel_mask == 0);
+
+	*field_mask = clk->clksel_mask;
+	*src_addr = clk->clksel_reg;
+	*parent_div = clkr->div;
+
+	return clkr->val;
 }
 
-/* Sets basic clocks based on the specified rate */
-static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
+int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
 {
-	u32 flags, cur_rate, done_rate, bypass = 0;
-	u8 cpu_mask = 0;
-	struct prcm_config *prcm;
-	unsigned long found_speed = 0;
+	void __iomem *src_addr;
+	u32 field_val, field_mask, reg_val, parent_div;
 
-	if (clk != &virt_prcm_set)
+	if (unlikely(clk->flags & CONFIG_PARTICIPANT))
 		return -EINVAL;
 
-	/* FIXME: Change cpu_is_omap2420() to cpu_is_omap242x() */
-	if (cpu_is_omap2420())
-		cpu_mask = RATE_IN_242X;
-	else if (cpu_is_omap2430())
-		cpu_mask = RATE_IN_243X;
-
-	for (prcm = rate_table; prcm->mpu_speed; prcm++) {
-		if (!(prcm->flags & cpu_mask))
-			continue;
-
-		if (prcm->xtal_speed != sys_ck.rate)
-			continue;
-
-		if (prcm->mpu_speed <= rate) {
-			found_speed = prcm->mpu_speed;
-			break;
-		}
-	}
-
-	if (!found_speed) {
-		printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
-	 rate / 1000000);
+	if (!clk->clksel)
 		return -EINVAL;
-	}
-
-	curr_prcm_set = prcm;
-	cur_rate = omap2_get_dpll_rate(&dpll_ck);
-
-	if (prcm->dpll_speed == cur_rate / 2) {
-		omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
-	} else if (prcm->dpll_speed == cur_rate * 2) {
-		omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
-	} else if (prcm->dpll_speed != cur_rate) {
-		local_irq_save(flags);
 
-		if (prcm->dpll_speed == prcm->xtal_speed)
-			bypass = 1;
+	field_val = omap2_clksel_get_src_field(&src_addr, new_parent,
+					       &field_mask, clk, &parent_div);
+	if (src_addr == 0)
+		return -EINVAL;
 
-		if ((prcm->cm_clksel2_pll & 0x3) == 2)
-			done_rate = PRCM_FULL_SPEED;
-		else
-			done_rate = PRCM_HALF_SPEED;
+	if (clk->usecount > 0)
+		_omap2_clk_disable(clk);
 
-		/* MPU divider */
-		CM_CLKSEL_MPU = prcm->cm_clksel_mpu;
+	/* Set new source value (previous dividers if any in effect) */
+	reg_val = __raw_readl(src_addr) & ~field_mask;
+	reg_val |= (field_val << __ffs(field_mask));
+	__raw_writel(reg_val, src_addr);
+	wmb();
 
-		/* dsp + iva1 div(2420), iva2.1(2430) */
-		CM_CLKSEL_DSP = prcm->cm_clksel_dsp;
+	if (clk->flags & DELAYED_APP && cpu_is_omap24xx()) {
+		__raw_writel(OMAP24XX_VALID_CONFIG, OMAP24XX_PRCM_CLKCFG_CTRL);
+		wmb();
+	}
 
-		CM_CLKSEL_GFX = prcm->cm_clksel_gfx;
+	if (clk->usecount > 0)
+		_omap2_clk_enable(clk);
 
-		/* Major subsystem dividers */
-		CM_CLKSEL1_CORE = prcm->cm_clksel1_core;
-		if (cpu_is_omap2430())
-			CM_CLKSEL_MDM = prcm->cm_clksel_mdm;
+	clk->parent = new_parent;
 
-		/* x2 to enter init_mem */
-		omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
+	/* CLKSEL clocks follow their parents' rates, divided by a divisor */
+	clk->rate = new_parent->rate;
 
-		omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
-			       bypass);
+	if (parent_div > 0)
+		clk->rate /= parent_div;
 
-		omap2_init_memory_params(omap2_dll_force_needed());
-		omap2_reprogram_sdrc(done_rate, 0);
+	pr_debug("clock: set parent of %s to %s (new rate %ld)\n",
+		 clk->name, clk->parent->name, clk->rate);
 
-		local_irq_restore(flags);
-	}
-	omap2_clksel_recalc(&dpll_ck);
+	if (unlikely(clk->flags & RATE_PROPAGATES))
+		propagate_rate(clk);
 
 	return 0;
 }
@@ -1027,150 +726,17 @@ static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
  *-------------------------------------------------------------------------*/
 
 #ifdef CONFIG_OMAP_RESET_CLOCKS
-static void __init omap2_clk_disable_unused(struct clk *clk)
+void omap2_clk_disable_unused(struct clk *clk)
 {
-	u32 regval32;
+	u32 regval32, v;
+
+	v = (clk->flags & INVERT_ENABLE) ? (1 << clk->enable_bit) : 0;
 
 	regval32 = __raw_readl(clk->enable_reg);
-	if ((regval32 & (1 << clk->enable_bit)) == 0)
+	if ((regval32 & (1 << clk->enable_bit)) == v)
 		return;
 
 	printk(KERN_INFO "Disabling unused clock \"%s\"\n", clk->name);
 	_omap2_clk_disable(clk);
 }
-#else
-#define omap2_clk_disable_unused	NULL
 #endif
-
-static 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,
-};
-
-static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
-{
-	u32 div, aplls, sclk = 13000000;
-
-	aplls = CM_CLKSEL1_PLL;
-	aplls &= ((1 << 23) | (1 << 24) | (1 << 25));
-	aplls >>= 23;			/* Isolate field, 0,2,3 */
-
-	if (aplls == 0)
-		sclk = 19200000;
-	else if (aplls == 2)
-		sclk = 13000000;
-	else if (aplls == 3)
-		sclk = 12000000;
-
-	div = PRCM_CLKSRC_CTRL;
-	div &= ((1 << 7) | (1 << 6));
-	div >>= sys->rate_offset;
-
-	osc->rate = sclk * div;
-	sys->rate = sclk;
-}
-
-/*
- * Set clocks for bypass mode for reboot to work.
- */
-void omap2_clk_prepare_for_reboot(void)
-{
-	u32 rate;
-
-	if (vclk == NULL || sclk == NULL)
-		return;
-
-	rate = clk_get_rate(sclk);
-	clk_set_rate(vclk, rate);
-}
-
-/*
- * 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)
-{
-	if (!mpurate)
-		return -EINVAL;
-
-	if (omap2_select_table_rate(&virt_prcm_set, mpurate))
-		printk(KERN_ERR "Could not find matching MPU rate\n");
-
-	propagate_rate(&osc_ck);		/* update main root fast */
-	propagate_rate(&func_32k_ck);		/* update main root slow */
-
-	printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
-	       "%ld.%01ld/%ld/%ld MHz\n",
-	       (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
-	       (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
-
-	return 0;
-}
-arch_initcall(omap2_clk_arch_init);
-
-int __init omap2_clk_init(void)
-{
-	struct prcm_config *prcm;
-	struct clk ** clkp;
-	u32 clkrate;
-
-	clk_init(&omap2_clk_functions);
-	omap2_get_crystal_rate(&osc_ck, &sys_ck);
-
-	for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
-	     clkp++) {
-
-		if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
-			clk_register(*clkp);
-			continue;
-		}
-
-		if ((*clkp)->flags & CLOCK_IN_OMAP243X && cpu_is_omap2430()) {
-			clk_register(*clkp);
-			continue;
-		}
-	}
-
-	/* Check the MPU rate set by bootloader */
-	clkrate = omap2_get_dpll_rate(&dpll_ck);
-	for (prcm = rate_table; prcm->mpu_speed; prcm++) {
-		if (prcm->xtal_speed != sys_ck.rate)
-			continue;
-		if (prcm->dpll_speed <= clkrate)
-			 break;
-	}
-	curr_prcm_set = prcm;
-
-	propagate_rate(&osc_ck);		/* update main root fast */
-	propagate_rate(&func_32k_ck);		/* update main root slow */
-
-	printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
-	       "%ld.%01ld/%ld/%ld MHz\n",
-	       (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
-	       (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
-
-	/*
-	 * Only enable those clocks we will need, let the drivers
-	 * enable other clocks as necessary
-	 */
-	clk_enable(&sync_32k_ick);
-	clk_enable(&omapctrl_ick);
-
-	/* Force the APLLs always active. The clocks are idled
-	 * automatically by hardware. */
-	clk_enable(&apll96_ck);
-	clk_enable(&apll54_ck);
-
-	if (cpu_is_omap2430())
-		clk_enable(&sdrc_ick);
-
-	/* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
-	vclk = clk_get(NULL, "virt_prcm_set");
-	sclk = clk_get(NULL, "sys_ck");
-
-	return 0;
-}