ARM: OMAP2+: powerdomain/PRM: move the low-level powerdomain functions into PRM

Move the low-level SoC-specific powerdomain control functions into
prm*.c.  For example, OMAP2xxx low-level powerdomain functions go into
prm2xxx.c.  Then remove the unnecessary powerdomain*xxx*.c files.

The objective is to centralize low-level PRM register accesses into
the prm*.[ch] files, and then to export an OMAP SoC-independent API to
higher-level OMAP power management code.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Vaibhav Hiremath <hvaibhav@ti.com>
Acked-by: Rajendra Nayak <rnayak@ti.com>
Reviewed-by: Russ Dill <Russ.Dill@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

10 files changed, 739 insertions, 758 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 20849604be94..7404e3d48cea 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -95,6 +95,7 @@ endif
 # PRCM
 obj-y					+= prcm.o prm_common.o
 obj-$(CONFIG_ARCH_OMAP2)		+= cm2xxx_3xxx.o prm2xxx_3xxx.o
+obj-$(CONFIG_ARCH_OMAP2)		+= prm2xxx.o
 obj-$(CONFIG_ARCH_OMAP3)		+= cm2xxx_3xxx.o prm2xxx_3xxx.o
 obj-$(CONFIG_ARCH_OMAP3)		+= prm3xxx.o
 obj-$(CONFIG_ARCH_OMAP3)		+= vc3xxx_data.o vp3xxx_data.o
diff --git a/arch/arm/mach-omap2/powerdomain2xxx_3xxx.c b/arch/arm/mach-omap2/powerdomain2xxx_3xxx.c
deleted file mode 100644
index 3950ccfe5f4a..000000000000
--- a/arch/arm/mach-omap2/powerdomain2xxx_3xxx.c
+++ /dev/null
@@ -1,242 +0,0 @@
-/*
- * OMAP2 and OMAP3 powerdomain control
- *
- * Copyright (C) 2009-2011 Texas Instruments, Inc.
- * Copyright (C) 2007-2009 Nokia Corporation
- *
- * Derived from mach-omap2/powerdomain.c written by Paul Walmsley
- * Rajendra Nayak <rnayak@ti.com>
- *
- * 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.
- */
-
-#include <linux/io.h>
-#include <linux/errno.h>
-#include <linux/delay.h>
-#include <linux/bug.h>
-
-#include <plat/prcm.h>
-
-#include "powerdomain.h"
-#include "prm.h"
-#include "prm-regbits-24xx.h"
-#include "prm-regbits-34xx.h"
-
-
-/* Common functions across OMAP2 and OMAP3 */
-static int omap2_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
-{
-	omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
-				(pwrst << OMAP_POWERSTATE_SHIFT),
-				pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
-	return 0;
-}
-
-static int omap2_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
-{
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
-					     OMAP2_PM_PWSTCTRL,
-					     OMAP_POWERSTATE_MASK);
-}
-
-static int omap2_pwrdm_read_pwrst(struct powerdomain *pwrdm)
-{
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
-					     OMAP2_PM_PWSTST,
-					     OMAP_POWERSTATEST_MASK);
-}
-
-static int omap2_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
-								u8 pwrst)
-{
-	u32 m;
-
-	m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
-
-	omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
-				   OMAP2_PM_PWSTCTRL);
-
-	return 0;
-}
-
-static int omap2_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
-								u8 pwrst)
-{
-	u32 m;
-
-	m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
-
-	omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
-				   OMAP2_PM_PWSTCTRL);
-
-	return 0;
-}
-
-static int omap2_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
-{
-	u32 m;
-
-	m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
-
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP2_PM_PWSTST,
-					     m);
-}
-
-static int omap2_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
-{
-	u32 m;
-
-	m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
-
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
-					     OMAP2_PM_PWSTCTRL, m);
-}
-
-static int omap2_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
-{
-	u32 v;
-
-	v = pwrst << __ffs(OMAP3430_LOGICL1CACHERETSTATE_MASK);
-	omap2_prm_rmw_mod_reg_bits(OMAP3430_LOGICL1CACHERETSTATE_MASK, v,
-				   pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
-
-	return 0;
-}
-
-static int omap2_pwrdm_wait_transition(struct powerdomain *pwrdm)
-{
-	u32 c = 0;
-
-	/*
-	 * REVISIT: pwrdm_wait_transition() may be better implemented
-	 * via a callback and a periodic timer check -- how long do we expect
-	 * powerdomain transitions to take?
-	 */
-
-	/* XXX Is this udelay() value meaningful? */
-	while ((omap2_prm_read_mod_reg(pwrdm->prcm_offs, OMAP2_PM_PWSTST) &
-		OMAP_INTRANSITION_MASK) &&
-		(c++ < PWRDM_TRANSITION_BAILOUT))
-			udelay(1);
-
-	if (c > PWRDM_TRANSITION_BAILOUT) {
-		pr_err("powerdomain: %s: waited too long to complete transition\n",
-		       pwrdm->name);
-		return -EAGAIN;
-	}
-
-	pr_debug("powerdomain: completed transition in %d loops\n", c);
-
-	return 0;
-}
-
-/* Applicable only for OMAP3. Not supported on OMAP2 */
-static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
-{
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
-					     OMAP3430_PM_PREPWSTST,
-					     OMAP3430_LASTPOWERSTATEENTERED_MASK);
-}
-
-static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
-{
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
-					     OMAP2_PM_PWSTST,
-					     OMAP3430_LOGICSTATEST_MASK);
-}
-
-static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
-{
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
-					     OMAP2_PM_PWSTCTRL,
-					     OMAP3430_LOGICSTATEST_MASK);
-}
-
-static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
-{
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
-					     OMAP3430_PM_PREPWSTST,
-					     OMAP3430_LASTLOGICSTATEENTERED_MASK);
-}
-
-static int omap3_get_mem_bank_lastmemst_mask(u8 bank)
-{
-	switch (bank) {
-	case 0:
-		return OMAP3430_LASTMEM1STATEENTERED_MASK;
-	case 1:
-		return OMAP3430_LASTMEM2STATEENTERED_MASK;
-	case 2:
-		return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
-	case 3:
-		return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
-	default:
-		WARN_ON(1); /* should never happen */
-		return -EEXIST;
-	}
-	return 0;
-}
-
-static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
-{
-	u32 m;
-
-	m = omap3_get_mem_bank_lastmemst_mask(bank);
-
-	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
-				OMAP3430_PM_PREPWSTST, m);
-}
-
-static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
-{
-	omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
-	return 0;
-}
-
-static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
-{
-	return omap2_prm_rmw_mod_reg_bits(0,
-					  1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
-					  pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
-}
-
-static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
-{
-	return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
-					  0, pwrdm->prcm_offs,
-					  OMAP2_PM_PWSTCTRL);
-}
-
-struct pwrdm_ops omap2_pwrdm_operations = {
-	.pwrdm_set_next_pwrst	= omap2_pwrdm_set_next_pwrst,
-	.pwrdm_read_next_pwrst	= omap2_pwrdm_read_next_pwrst,
-	.pwrdm_read_pwrst	= omap2_pwrdm_read_pwrst,
-	.pwrdm_set_logic_retst	= omap2_pwrdm_set_logic_retst,
-	.pwrdm_set_mem_onst	= omap2_pwrdm_set_mem_onst,
-	.pwrdm_set_mem_retst	= omap2_pwrdm_set_mem_retst,
-	.pwrdm_read_mem_pwrst	= omap2_pwrdm_read_mem_pwrst,
-	.pwrdm_read_mem_retst	= omap2_pwrdm_read_mem_retst,
-	.pwrdm_wait_transition	= omap2_pwrdm_wait_transition,
-};
-
-struct pwrdm_ops omap3_pwrdm_operations = {
-	.pwrdm_set_next_pwrst	= omap2_pwrdm_set_next_pwrst,
-	.pwrdm_read_next_pwrst	= omap2_pwrdm_read_next_pwrst,
-	.pwrdm_read_pwrst	= omap2_pwrdm_read_pwrst,
-	.pwrdm_read_prev_pwrst	= omap3_pwrdm_read_prev_pwrst,
-	.pwrdm_set_logic_retst	= omap2_pwrdm_set_logic_retst,
-	.pwrdm_read_logic_pwrst	= omap3_pwrdm_read_logic_pwrst,
-	.pwrdm_read_logic_retst	= omap3_pwrdm_read_logic_retst,
-	.pwrdm_read_prev_logic_pwrst	= omap3_pwrdm_read_prev_logic_pwrst,
-	.pwrdm_set_mem_onst	= omap2_pwrdm_set_mem_onst,
-	.pwrdm_set_mem_retst	= omap2_pwrdm_set_mem_retst,
-	.pwrdm_read_mem_pwrst	= omap2_pwrdm_read_mem_pwrst,
-	.pwrdm_read_mem_retst	= omap2_pwrdm_read_mem_retst,
-	.pwrdm_read_prev_mem_pwrst	= omap3_pwrdm_read_prev_mem_pwrst,
-	.pwrdm_clear_all_prev_pwrst	= omap3_pwrdm_clear_all_prev_pwrst,
-	.pwrdm_enable_hdwr_sar	= omap3_pwrdm_enable_hdwr_sar,
-	.pwrdm_disable_hdwr_sar	= omap3_pwrdm_disable_hdwr_sar,
-	.pwrdm_wait_transition	= omap2_pwrdm_wait_transition,
-};
diff --git a/arch/arm/mach-omap2/powerdomain33xx.c b/arch/arm/mach-omap2/powerdomain33xx.c
deleted file mode 100644
index 67c5663899b6..000000000000
--- a/arch/arm/mach-omap2/powerdomain33xx.c
+++ /dev/null
@@ -1,229 +0,0 @@
-/*
- * AM33XX Powerdomain control
- *
- * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
- *
- * Derived from mach-omap2/powerdomain44xx.c written by Rajendra Nayak
- * <rnayak@ti.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/io.h>
-#include <linux/errno.h>
-#include <linux/delay.h>
-
-#include <plat/prcm.h>
-
-#include "powerdomain.h"
-#include "prm33xx.h"
-#include "prm-regbits-33xx.h"
-
-
-static int am33xx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
-{
-	am33xx_prm_rmw_reg_bits(OMAP_POWERSTATE_MASK,
-				(pwrst << OMAP_POWERSTATE_SHIFT),
-				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
-	return 0;
-}
-
-static int am33xx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = am33xx_prm_read_reg(pwrdm->prcm_offs,  pwrdm->pwrstctrl_offs);
-	v &= OMAP_POWERSTATE_MASK;
-	v >>= OMAP_POWERSTATE_SHIFT;
-
-	return v;
-}
-
-static int am33xx_pwrdm_read_pwrst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs);
-	v &= OMAP_POWERSTATEST_MASK;
-	v >>= OMAP_POWERSTATEST_SHIFT;
-
-	return v;
-}
-
-static int am33xx_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs);
-	v &= AM33XX_LASTPOWERSTATEENTERED_MASK;
-	v >>= AM33XX_LASTPOWERSTATEENTERED_SHIFT;
-
-	return v;
-}
-
-static int am33xx_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
-{
-	am33xx_prm_rmw_reg_bits(AM33XX_LOWPOWERSTATECHANGE_MASK,
-				(1 << AM33XX_LOWPOWERSTATECHANGE_SHIFT),
-				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
-	return 0;
-}
-
-static int am33xx_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
-{
-	am33xx_prm_rmw_reg_bits(AM33XX_LASTPOWERSTATEENTERED_MASK,
-				AM33XX_LASTPOWERSTATEENTERED_MASK,
-				pwrdm->prcm_offs, pwrdm->pwrstst_offs);
-	return 0;
-}
-
-static int am33xx_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
-{
-	u32 m;
-
-	m = pwrdm->logicretstate_mask;
-	if (!m)
-		return -EINVAL;
-
-	am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)),
-				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
-
-	return 0;
-}
-
-static int am33xx_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs);
-	v &= AM33XX_LOGICSTATEST_MASK;
-	v >>= AM33XX_LOGICSTATEST_SHIFT;
-
-	return v;
-}
-
-static int am33xx_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
-{
-	u32 v, m;
-
-	m = pwrdm->logicretstate_mask;
-	if (!m)
-		return -EINVAL;
-
-	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
-	v &= m;
-	v >>= __ffs(m);
-
-	return v;
-}
-
-static int am33xx_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
-		u8 pwrst)
-{
-	u32 m;
-
-	m = pwrdm->mem_on_mask[bank];
-	if (!m)
-		return -EINVAL;
-
-	am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)),
-				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
-
-	return 0;
-}
-
-static int am33xx_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
-					u8 pwrst)
-{
-	u32 m;
-
-	m = pwrdm->mem_ret_mask[bank];
-	if (!m)
-		return -EINVAL;
-
-	am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)),
-				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
-
-	return 0;
-}
-
-static int am33xx_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
-{
-	u32 m, v;
-
-	m = pwrdm->mem_pwrst_mask[bank];
-	if (!m)
-		return -EINVAL;
-
-	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs);
-	v &= m;
-	v >>= __ffs(m);
-
-	return v;
-}
-
-static int am33xx_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
-{
-	u32 m, v;
-
-	m = pwrdm->mem_retst_mask[bank];
-	if (!m)
-		return -EINVAL;
-
-	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
-	v &= m;
-	v >>= __ffs(m);
-
-	return v;
-}
-
-static int am33xx_pwrdm_wait_transition(struct powerdomain *pwrdm)
-{
-	u32 c = 0;
-
-	/*
-	 * REVISIT: pwrdm_wait_transition() may be better implemented
-	 * via a callback and a periodic timer check -- how long do we expect
-	 * powerdomain transitions to take?
-	 */
-
-	/* XXX Is this udelay() value meaningful? */
-	while ((am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs)
-			& OMAP_INTRANSITION_MASK) &&
-			(c++ < PWRDM_TRANSITION_BAILOUT))
-		udelay(1);
-
-	if (c > PWRDM_TRANSITION_BAILOUT) {
-		pr_err("powerdomain: %s: waited too long to complete transition\n",
-		       pwrdm->name);
-		return -EAGAIN;
-	}
-
-	pr_debug("powerdomain: completed transition in %d loops\n", c);
-
-	return 0;
-}
-
-struct pwrdm_ops am33xx_pwrdm_operations = {
-	.pwrdm_set_next_pwrst		= am33xx_pwrdm_set_next_pwrst,
-	.pwrdm_read_next_pwrst		= am33xx_pwrdm_read_next_pwrst,
-	.pwrdm_read_pwrst		= am33xx_pwrdm_read_pwrst,
-	.pwrdm_read_prev_pwrst		= am33xx_pwrdm_read_prev_pwrst,
-	.pwrdm_set_logic_retst		= am33xx_pwrdm_set_logic_retst,
-	.pwrdm_read_logic_pwrst		= am33xx_pwrdm_read_logic_pwrst,
-	.pwrdm_read_logic_retst		= am33xx_pwrdm_read_logic_retst,
-	.pwrdm_clear_all_prev_pwrst	= am33xx_pwrdm_clear_all_prev_pwrst,
-	.pwrdm_set_lowpwrstchange	= am33xx_pwrdm_set_lowpwrstchange,
-	.pwrdm_read_mem_pwrst		= am33xx_pwrdm_read_mem_pwrst,
-	.pwrdm_read_mem_retst		= am33xx_pwrdm_read_mem_retst,
-	.pwrdm_set_mem_onst		= am33xx_pwrdm_set_mem_onst,
-	.pwrdm_set_mem_retst		= am33xx_pwrdm_set_mem_retst,
-	.pwrdm_wait_transition		= am33xx_pwrdm_wait_transition,
-};
diff --git a/arch/arm/mach-omap2/powerdomain44xx.c b/arch/arm/mach-omap2/powerdomain44xx.c
deleted file mode 100644
index aceb4f464c9b..000000000000
--- a/arch/arm/mach-omap2/powerdomain44xx.c
+++ /dev/null
@@ -1,285 +0,0 @@
-/*
- * OMAP4 powerdomain control
- *
- * Copyright (C) 2009-2010, 2012 Texas Instruments, Inc.
- * Copyright (C) 2007-2009 Nokia Corporation
- *
- * Derived from mach-omap2/powerdomain.c written by Paul Walmsley
- * Rajendra Nayak <rnayak@ti.com>
- *
- * 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.
- */
-
-#include <linux/io.h>
-#include <linux/errno.h>
-#include <linux/delay.h>
-#include <linux/bug.h>
-
-#include "powerdomain.h"
-#include <plat/prcm.h>
-#include "prm2xxx_3xxx.h"
-#include "prm44xx.h"
-#include "prminst44xx.h"
-#include "prm-regbits-44xx.h"
-
-static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
-{
-	omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK,
-					(pwrst << OMAP_POWERSTATE_SHIFT),
-					pwrdm->prcm_partition,
-					pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
-	return 0;
-}
-
-static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTCTRL);
-	v &= OMAP_POWERSTATE_MASK;
-	v >>= OMAP_POWERSTATE_SHIFT;
-
-	return v;
-}
-
-static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTST);
-	v &= OMAP_POWERSTATEST_MASK;
-	v >>= OMAP_POWERSTATEST_SHIFT;
-
-	return v;
-}
-
-static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTST);
-	v &= OMAP4430_LASTPOWERSTATEENTERED_MASK;
-	v >>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT;
-
-	return v;
-}
-
-static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
-{
-	omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
-					(1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
-					pwrdm->prcm_partition,
-					pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
-	return 0;
-}
-
-static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
-{
-	omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
-					OMAP4430_LASTPOWERSTATEENTERED_MASK,
-					pwrdm->prcm_partition,
-					pwrdm->prcm_offs, OMAP4_PM_PWSTST);
-	return 0;
-}
-
-static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
-{
-	u32 v;
-
-	v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK);
-	omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v,
-					pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTCTRL);
-
-	return 0;
-}
-
-static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
-				    u8 pwrst)
-{
-	u32 m;
-
-	m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
-
-	omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
-					pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTCTRL);
-
-	return 0;
-}
-
-static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
-				     u8 pwrst)
-{
-	u32 m;
-
-	m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
-
-	omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
-					pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTCTRL);
-
-	return 0;
-}
-
-static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTST);
-	v &= OMAP4430_LOGICSTATEST_MASK;
-	v >>= OMAP4430_LOGICSTATEST_SHIFT;
-
-	return v;
-}
-
-static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
-{
-	u32 v;
-
-	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTCTRL);
-	v &= OMAP4430_LOGICRETSTATE_MASK;
-	v >>= OMAP4430_LOGICRETSTATE_SHIFT;
-
-	return v;
-}
-
-/**
- * omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
- * @pwrdm: struct powerdomain * to read the state for
- *
- * Reads the previous logic powerstate for a powerdomain. This
- * function must determine the previous logic powerstate by first
- * checking the previous powerstate for the domain. If that was OFF,
- * then logic has been lost. If previous state was RETENTION, the
- * function reads the setting for the next retention logic state to
- * see the actual value.  In every other case, the logic is
- * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
- * depending whether the logic was retained or not.
- */
-static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
-{
-	int state;
-
-	state = omap4_pwrdm_read_prev_pwrst(pwrdm);
-
-	if (state == PWRDM_POWER_OFF)
-		return PWRDM_POWER_OFF;
-
-	if (state != PWRDM_POWER_RET)
-		return PWRDM_POWER_RET;
-
-	return omap4_pwrdm_read_logic_retst(pwrdm);
-}
-
-static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
-{
-	u32 m, v;
-
-	m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
-
-	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTST);
-	v &= m;
-	v >>= __ffs(m);
-
-	return v;
-}
-
-static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
-{
-	u32 m, v;
-
-	m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
-
-	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
-					OMAP4_PM_PWSTCTRL);
-	v &= m;
-	v >>= __ffs(m);
-
-	return v;
-}
-
-/**
- * omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate
- * @pwrdm: struct powerdomain * to read mem powerstate for
- * @bank: memory bank index
- *
- * Reads the previous memory powerstate for a powerdomain. This
- * function must determine the previous memory powerstate by first
- * checking the previous powerstate for the domain. If that was OFF,
- * then logic has been lost. If previous state was RETENTION, the
- * function reads the setting for the next memory retention state to
- * see the actual value.  In every other case, the logic is
- * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
- * depending whether logic was retained or not.
- */
-static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
-{
-	int state;
-
-	state = omap4_pwrdm_read_prev_pwrst(pwrdm);
-
-	if (state == PWRDM_POWER_OFF)
-		return PWRDM_POWER_OFF;
-
-	if (state != PWRDM_POWER_RET)
-		return PWRDM_POWER_RET;
-
-	return omap4_pwrdm_read_mem_retst(pwrdm, bank);
-}
-
-static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
-{
-	u32 c = 0;
-
-	/*
-	 * REVISIT: pwrdm_wait_transition() may be better implemented
-	 * via a callback and a periodic timer check -- how long do we expect
-	 * powerdomain transitions to take?
-	 */
-
-	/* XXX Is this udelay() value meaningful? */
-	while ((omap4_prminst_read_inst_reg(pwrdm->prcm_partition,
-					    pwrdm->prcm_offs,
-					    OMAP4_PM_PWSTST) &
-		OMAP_INTRANSITION_MASK) &&
-	       (c++ < PWRDM_TRANSITION_BAILOUT))
-		udelay(1);
-
-	if (c > PWRDM_TRANSITION_BAILOUT) {
-		pr_err("powerdomain: %s: waited too long to complete transition\n",
-		       pwrdm->name);
-		return -EAGAIN;
-	}
-
-	pr_debug("powerdomain: completed transition in %d loops\n", c);
-
-	return 0;
-}
-
-struct pwrdm_ops omap4_pwrdm_operations = {
-	.pwrdm_set_next_pwrst	= omap4_pwrdm_set_next_pwrst,
-	.pwrdm_read_next_pwrst	= omap4_pwrdm_read_next_pwrst,
-	.pwrdm_read_pwrst	= omap4_pwrdm_read_pwrst,
-	.pwrdm_read_prev_pwrst	= omap4_pwrdm_read_prev_pwrst,
-	.pwrdm_set_lowpwrstchange	= omap4_pwrdm_set_lowpwrstchange,
-	.pwrdm_clear_all_prev_pwrst	= omap4_pwrdm_clear_all_prev_pwrst,
-	.pwrdm_set_logic_retst	= omap4_pwrdm_set_logic_retst,
-	.pwrdm_read_logic_pwrst	= omap4_pwrdm_read_logic_pwrst,
-	.pwrdm_read_prev_logic_pwrst	= omap4_pwrdm_read_prev_logic_pwrst,
-	.pwrdm_read_logic_retst	= omap4_pwrdm_read_logic_retst,
-	.pwrdm_read_mem_pwrst	= omap4_pwrdm_read_mem_pwrst,
-	.pwrdm_read_mem_retst	= omap4_pwrdm_read_mem_retst,
-	.pwrdm_read_prev_mem_pwrst	= omap4_pwrdm_read_prev_mem_pwrst,
-	.pwrdm_set_mem_onst	= omap4_pwrdm_set_mem_onst,
-	.pwrdm_set_mem_retst	= omap4_pwrdm_set_mem_retst,
-	.pwrdm_wait_transition	= omap4_pwrdm_wait_transition,
-};
diff --git a/arch/arm/mach-omap2/prm2xxx.c b/arch/arm/mach-omap2/prm2xxx.c
new file mode 100644
index 000000000000..218ef6a1f11e
--- /dev/null
+++ b/arch/arm/mach-omap2/prm2xxx.c
@@ -0,0 +1,41 @@
+/*
+ * OMAP2xxx PRM module functions
+ *
+ * Copyright (C) 2010-2012 Texas Instruments, Inc.
+ * Copyright (C) 2010 Nokia Corporation
+ * Benoît Cousson
+ * Paul Walmsley
+ * Rajendra Nayak <rnayak@ti.com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+
+#include "common.h"
+#include <plat/cpu.h>
+#include <plat/prcm.h>
+
+#include "vp.h"
+#include "powerdomain.h"
+#include "prm2xxx.h"
+#include "cm2xxx_3xxx.h"
+#include "prm-regbits-24xx.h"
+
+struct pwrdm_ops omap2_pwrdm_operations = {
+	.pwrdm_set_next_pwrst	= omap2_pwrdm_set_next_pwrst,
+	.pwrdm_read_next_pwrst	= omap2_pwrdm_read_next_pwrst,
+	.pwrdm_read_pwrst	= omap2_pwrdm_read_pwrst,
+	.pwrdm_set_logic_retst	= omap2_pwrdm_set_logic_retst,
+	.pwrdm_set_mem_onst	= omap2_pwrdm_set_mem_onst,
+	.pwrdm_set_mem_retst	= omap2_pwrdm_set_mem_retst,
+	.pwrdm_read_mem_pwrst	= omap2_pwrdm_read_mem_pwrst,
+	.pwrdm_read_mem_retst	= omap2_pwrdm_read_mem_retst,
+	.pwrdm_wait_transition	= omap2_pwrdm_wait_transition,
+};
diff --git a/arch/arm/mach-omap2/prm2xxx_3xxx.c b/arch/arm/mach-omap2/prm2xxx_3xxx.c
index 0d6cc543987d..bdddf5ca67c4 100644
--- a/arch/arm/mach-omap2/prm2xxx_3xxx.c
+++ b/arch/arm/mach-omap2/prm2xxx_3xxx.c
@@ -17,7 +17,7 @@
 #include <linux/io.h>
 
 #include "common.h"
-
+#include "powerdomain.h"
 #include "prm2xxx_3xxx.h"
 #include "prm-regbits-24xx.h"
 
@@ -98,3 +98,113 @@ int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift)
 	return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
 }
 
+
+/* Powerdomain low-level functions */
+
+/* Common functions across OMAP2 and OMAP3 */
+int omap2_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
+{
+	omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
+				   (pwrst << OMAP_POWERSTATE_SHIFT),
+				   pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
+	return 0;
+}
+
+int omap2_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
+{
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+					     OMAP2_PM_PWSTCTRL,
+					     OMAP_POWERSTATE_MASK);
+}
+
+int omap2_pwrdm_read_pwrst(struct powerdomain *pwrdm)
+{
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+					     OMAP2_PM_PWSTST,
+					     OMAP_POWERSTATEST_MASK);
+}
+
+int omap2_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
+								u8 pwrst)
+{
+	u32 m;
+
+	m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
+
+	omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
+				   OMAP2_PM_PWSTCTRL);
+
+	return 0;
+}
+
+int omap2_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
+								u8 pwrst)
+{
+	u32 m;
+
+	m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
+
+	omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
+				   OMAP2_PM_PWSTCTRL);
+
+	return 0;
+}
+
+int omap2_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+	u32 m;
+
+	m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
+
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP2_PM_PWSTST,
+					     m);
+}
+
+int omap2_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
+{
+	u32 m;
+
+	m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
+
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+					     OMAP2_PM_PWSTCTRL, m);
+}
+
+int omap2_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
+{
+	u32 v;
+
+	v = pwrst << __ffs(OMAP_LOGICRETSTATE_MASK);
+	omap2_prm_rmw_mod_reg_bits(OMAP_LOGICRETSTATE_MASK, v, pwrdm->prcm_offs,
+				   OMAP2_PM_PWSTCTRL);
+
+	return 0;
+}
+
+int omap2_pwrdm_wait_transition(struct powerdomain *pwrdm)
+{
+	u32 c = 0;
+
+	/*
+	 * REVISIT: pwrdm_wait_transition() may be better implemented
+	 * via a callback and a periodic timer check -- how long do we expect
+	 * powerdomain transitions to take?
+	 */
+
+	/* XXX Is this udelay() value meaningful? */
+	while ((omap2_prm_read_mod_reg(pwrdm->prcm_offs, OMAP2_PM_PWSTST) &
+		OMAP_INTRANSITION_MASK) &&
+		(c++ < PWRDM_TRANSITION_BAILOUT))
+			udelay(1);
+
+	if (c > PWRDM_TRANSITION_BAILOUT) {
+		pr_err("powerdomain: %s: waited too long to complete transition\n",
+		       pwrdm->name);
+		return -EAGAIN;
+	}
+
+	pr_debug("powerdomain: completed transition in %d loops\n", c);
+
+	return 0;
+}
+
diff --git a/arch/arm/mach-omap2/prm2xxx_3xxx.h b/arch/arm/mach-omap2/prm2xxx_3xxx.h
index 8d09a1ac9311..706b0262f3f0 100644
--- a/arch/arm/mach-omap2/prm2xxx_3xxx.h
+++ b/arch/arm/mach-omap2/prm2xxx_3xxx.h
@@ -50,6 +50,7 @@
 #ifndef __ASSEMBLER__
 
 #include <linux/io.h>
+#include "powerdomain.h"
 
 /* Power/reset management domain register get/set */
 static inline u32 omap2_prm_read_mod_reg(s16 module, u16 idx)
@@ -103,6 +104,18 @@ extern int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift);
 extern int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift);
 extern int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift);
 
+extern int omap2_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst);
+extern int omap2_pwrdm_read_next_pwrst(struct powerdomain *pwrdm);
+extern int omap2_pwrdm_read_pwrst(struct powerdomain *pwrdm);
+extern int omap2_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
+				    u8 pwrst);
+extern int omap2_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
+				     u8 pwrst);
+extern int omap2_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
+extern int omap2_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank);
+extern int omap2_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst);
+extern int omap2_pwrdm_wait_transition(struct powerdomain *pwrdm);
+
 #endif /* __ASSEMBLER */
 
 /*
diff --git a/arch/arm/mach-omap2/prm33xx.c b/arch/arm/mach-omap2/prm33xx.c
index e7dbb6cf1255..3417dd3a7c37 100644
--- a/arch/arm/mach-omap2/prm33xx.c
+++ b/arch/arm/mach-omap2/prm33xx.c
@@ -22,6 +22,7 @@
 #include <plat/common.h>
 
 #include "common.h"
+#include "powerdomain.h"
 #include "prm33xx.h"
 #include "prm-regbits-33xx.h"
 
@@ -133,3 +134,204 @@ int am33xx_prm_deassert_hardreset(u8 shift, s16 inst,
 
 	return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
 }
+
+static int am33xx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
+{
+	am33xx_prm_rmw_reg_bits(OMAP_POWERSTATE_MASK,
+				(pwrst << OMAP_POWERSTATE_SHIFT),
+				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
+	return 0;
+}
+
+static int am33xx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = am33xx_prm_read_reg(pwrdm->prcm_offs,  pwrdm->pwrstctrl_offs);
+	v &= OMAP_POWERSTATE_MASK;
+	v >>= OMAP_POWERSTATE_SHIFT;
+
+	return v;
+}
+
+static int am33xx_pwrdm_read_pwrst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs);
+	v &= OMAP_POWERSTATEST_MASK;
+	v >>= OMAP_POWERSTATEST_SHIFT;
+
+	return v;
+}
+
+static int am33xx_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs);
+	v &= AM33XX_LASTPOWERSTATEENTERED_MASK;
+	v >>= AM33XX_LASTPOWERSTATEENTERED_SHIFT;
+
+	return v;
+}
+
+static int am33xx_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
+{
+	am33xx_prm_rmw_reg_bits(AM33XX_LOWPOWERSTATECHANGE_MASK,
+				(1 << AM33XX_LOWPOWERSTATECHANGE_SHIFT),
+				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
+	return 0;
+}
+
+static int am33xx_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
+{
+	am33xx_prm_rmw_reg_bits(AM33XX_LASTPOWERSTATEENTERED_MASK,
+				AM33XX_LASTPOWERSTATEENTERED_MASK,
+				pwrdm->prcm_offs, pwrdm->pwrstst_offs);
+	return 0;
+}
+
+static int am33xx_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
+{
+	u32 m;
+
+	m = pwrdm->logicretstate_mask;
+	if (!m)
+		return -EINVAL;
+
+	am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)),
+				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
+
+	return 0;
+}
+
+static int am33xx_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs);
+	v &= AM33XX_LOGICSTATEST_MASK;
+	v >>= AM33XX_LOGICSTATEST_SHIFT;
+
+	return v;
+}
+
+static int am33xx_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
+{
+	u32 v, m;
+
+	m = pwrdm->logicretstate_mask;
+	if (!m)
+		return -EINVAL;
+
+	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
+	v &= m;
+	v >>= __ffs(m);
+
+	return v;
+}
+
+static int am33xx_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
+		u8 pwrst)
+{
+	u32 m;
+
+	m = pwrdm->mem_on_mask[bank];
+	if (!m)
+		return -EINVAL;
+
+	am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)),
+				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
+
+	return 0;
+}
+
+static int am33xx_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
+					u8 pwrst)
+{
+	u32 m;
+
+	m = pwrdm->mem_ret_mask[bank];
+	if (!m)
+		return -EINVAL;
+
+	am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)),
+				pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
+
+	return 0;
+}
+
+static int am33xx_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+	u32 m, v;
+
+	m = pwrdm->mem_pwrst_mask[bank];
+	if (!m)
+		return -EINVAL;
+
+	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs);
+	v &= m;
+	v >>= __ffs(m);
+
+	return v;
+}
+
+static int am33xx_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
+{
+	u32 m, v;
+
+	m = pwrdm->mem_retst_mask[bank];
+	if (!m)
+		return -EINVAL;
+
+	v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstctrl_offs);
+	v &= m;
+	v >>= __ffs(m);
+
+	return v;
+}
+
+static int am33xx_pwrdm_wait_transition(struct powerdomain *pwrdm)
+{
+	u32 c = 0;
+
+	/*
+	 * REVISIT: pwrdm_wait_transition() may be better implemented
+	 * via a callback and a periodic timer check -- how long do we expect
+	 * powerdomain transitions to take?
+	 */
+
+	/* XXX Is this udelay() value meaningful? */
+	while ((am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs)
+			& OMAP_INTRANSITION_MASK) &&
+			(c++ < PWRDM_TRANSITION_BAILOUT))
+		udelay(1);
+
+	if (c > PWRDM_TRANSITION_BAILOUT) {
+		pr_err("powerdomain: %s: waited too long to complete transition\n",
+		       pwrdm->name);
+		return -EAGAIN;
+	}
+
+	pr_debug("powerdomain: completed transition in %d loops\n", c);
+
+	return 0;
+}
+
+struct pwrdm_ops am33xx_pwrdm_operations = {
+	.pwrdm_set_next_pwrst		= am33xx_pwrdm_set_next_pwrst,
+	.pwrdm_read_next_pwrst		= am33xx_pwrdm_read_next_pwrst,
+	.pwrdm_read_pwrst		= am33xx_pwrdm_read_pwrst,
+	.pwrdm_read_prev_pwrst		= am33xx_pwrdm_read_prev_pwrst,
+	.pwrdm_set_logic_retst		= am33xx_pwrdm_set_logic_retst,
+	.pwrdm_read_logic_pwrst		= am33xx_pwrdm_read_logic_pwrst,
+	.pwrdm_read_logic_retst		= am33xx_pwrdm_read_logic_retst,
+	.pwrdm_clear_all_prev_pwrst	= am33xx_pwrdm_clear_all_prev_pwrst,
+	.pwrdm_set_lowpwrstchange	= am33xx_pwrdm_set_lowpwrstchange,
+	.pwrdm_read_mem_pwrst		= am33xx_pwrdm_read_mem_pwrst,
+	.pwrdm_read_mem_retst		= am33xx_pwrdm_read_mem_retst,
+	.pwrdm_set_mem_onst		= am33xx_pwrdm_set_mem_onst,
+	.pwrdm_set_mem_retst		= am33xx_pwrdm_set_mem_retst,
+	.pwrdm_wait_transition		= am33xx_pwrdm_wait_transition,
+};
diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c
index 88f7d8de7da9..e276ff270ac5 100644
--- a/arch/arm/mach-omap2/prm3xxx.c
+++ b/arch/arm/mach-omap2/prm3xxx.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2010 Nokia Corporation
  * Benoît Cousson
  * Paul Walmsley
+ * Rajendra Nayak <rnayak@ti.com>
  *
  * 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
@@ -22,8 +23,9 @@
 #include <plat/prcm.h>
 
 #include "vp.h"
-
+#include "powerdomain.h"
 #include "prm3xxx.h"
+#include "prm2xxx_3xxx.h"
 #include "cm2xxx_3xxx.h"
 #include "prm-regbits-34xx.h"
 
@@ -215,6 +217,109 @@ static void __init omap3xxx_prm_enable_io_wakeup(void)
 					   PM_WKEN);
 }
 
+/* Powerdomain low-level functions */
+
+/* Applicable only for OMAP3. Not supported on OMAP2 */
+static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
+{
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+					     OMAP3430_PM_PREPWSTST,
+					     OMAP3430_LASTPOWERSTATEENTERED_MASK);
+}
+
+static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
+{
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+					     OMAP2_PM_PWSTST,
+					     OMAP3430_LOGICSTATEST_MASK);
+}
+
+static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
+{
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+					     OMAP2_PM_PWSTCTRL,
+					     OMAP3430_LOGICSTATEST_MASK);
+}
+
+static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
+{
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+					     OMAP3430_PM_PREPWSTST,
+					     OMAP3430_LASTLOGICSTATEENTERED_MASK);
+}
+
+static int omap3_get_mem_bank_lastmemst_mask(u8 bank)
+{
+	switch (bank) {
+	case 0:
+		return OMAP3430_LASTMEM1STATEENTERED_MASK;
+	case 1:
+		return OMAP3430_LASTMEM2STATEENTERED_MASK;
+	case 2:
+		return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
+	case 3:
+		return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
+	default:
+		WARN_ON(1); /* should never happen */
+		return -EEXIST;
+	}
+	return 0;
+}
+
+static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+	u32 m;
+
+	m = omap3_get_mem_bank_lastmemst_mask(bank);
+
+	return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+				OMAP3430_PM_PREPWSTST, m);
+}
+
+static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
+{
+	omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
+	return 0;
+}
+
+static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
+{
+	return omap2_prm_rmw_mod_reg_bits(0,
+					  1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
+					  pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
+}
+
+static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
+{
+	return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
+					  0, pwrdm->prcm_offs,
+					  OMAP2_PM_PWSTCTRL);
+}
+
+struct pwrdm_ops omap3_pwrdm_operations = {
+	.pwrdm_set_next_pwrst	= omap2_pwrdm_set_next_pwrst,
+	.pwrdm_read_next_pwrst	= omap2_pwrdm_read_next_pwrst,
+	.pwrdm_read_pwrst	= omap2_pwrdm_read_pwrst,
+	.pwrdm_read_prev_pwrst	= omap3_pwrdm_read_prev_pwrst,
+	.pwrdm_set_logic_retst	= omap2_pwrdm_set_logic_retst,
+	.pwrdm_read_logic_pwrst	= omap3_pwrdm_read_logic_pwrst,
+	.pwrdm_read_logic_retst	= omap3_pwrdm_read_logic_retst,
+	.pwrdm_read_prev_logic_pwrst	= omap3_pwrdm_read_prev_logic_pwrst,
+	.pwrdm_set_mem_onst	= omap2_pwrdm_set_mem_onst,
+	.pwrdm_set_mem_retst	= omap2_pwrdm_set_mem_retst,
+	.pwrdm_read_mem_pwrst	= omap2_pwrdm_read_mem_pwrst,
+	.pwrdm_read_mem_retst	= omap2_pwrdm_read_mem_retst,
+	.pwrdm_read_prev_mem_pwrst	= omap3_pwrdm_read_prev_mem_pwrst,
+	.pwrdm_clear_all_prev_pwrst	= omap3_pwrdm_clear_all_prev_pwrst,
+	.pwrdm_enable_hdwr_sar	= omap3_pwrdm_enable_hdwr_sar,
+	.pwrdm_disable_hdwr_sar	= omap3_pwrdm_disable_hdwr_sar,
+	.pwrdm_wait_transition	= omap2_pwrdm_wait_transition,
+};
+
+/*
+ *
+ */
+
 static int __init omap3xxx_prm_init(void)
 {
 	int ret;
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index 06bb67910a31..48d91930796d 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2010 Nokia Corporation
  * Benoît Cousson
  * Paul Walmsley
+ * Rajendra Nayak <rnayak@ti.com>
  *
  * 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
@@ -27,6 +28,7 @@
 #include "prm-regbits-44xx.h"
 #include "prcm44xx.h"
 #include "prminst44xx.h"
+#include "powerdomain.h"
 
 static const struct omap_prcm_irq omap4_prcm_irqs[] = {
 	OMAP_PRCM_IRQ("wkup",   0,      0),
@@ -291,6 +293,269 @@ static void __init omap44xx_prm_enable_io_wakeup(void)
 				    OMAP4_PRM_IO_PMCTRL_OFFSET);
 }
 
+/* Powerdomain low-level functions */
+
+static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
+{
+	omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK,
+					(pwrst << OMAP_POWERSTATE_SHIFT),
+					pwrdm->prcm_partition,
+					pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
+	return 0;
+}
+
+static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTCTRL);
+	v &= OMAP_POWERSTATE_MASK;
+	v >>= OMAP_POWERSTATE_SHIFT;
+
+	return v;
+}
+
+static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTST);
+	v &= OMAP_POWERSTATEST_MASK;
+	v >>= OMAP_POWERSTATEST_SHIFT;
+
+	return v;
+}
+
+static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTST);
+	v &= OMAP4430_LASTPOWERSTATEENTERED_MASK;
+	v >>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT;
+
+	return v;
+}
+
+static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
+{
+	omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
+					(1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
+					pwrdm->prcm_partition,
+					pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
+	return 0;
+}
+
+static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
+{
+	omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
+					OMAP4430_LASTPOWERSTATEENTERED_MASK,
+					pwrdm->prcm_partition,
+					pwrdm->prcm_offs, OMAP4_PM_PWSTST);
+	return 0;
+}
+
+static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
+{
+	u32 v;
+
+	v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK);
+	omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v,
+					pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTCTRL);
+
+	return 0;
+}
+
+static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
+				    u8 pwrst)
+{
+	u32 m;
+
+	m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
+
+	omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
+					pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTCTRL);
+
+	return 0;
+}
+
+static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
+				     u8 pwrst)
+{
+	u32 m;
+
+	m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
+
+	omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
+					pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTCTRL);
+
+	return 0;
+}
+
+static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTST);
+	v &= OMAP4430_LOGICSTATEST_MASK;
+	v >>= OMAP4430_LOGICSTATEST_SHIFT;
+
+	return v;
+}
+
+static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
+{
+	u32 v;
+
+	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTCTRL);
+	v &= OMAP4430_LOGICRETSTATE_MASK;
+	v >>= OMAP4430_LOGICRETSTATE_SHIFT;
+
+	return v;
+}
+
+/**
+ * omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
+ * @pwrdm: struct powerdomain * to read the state for
+ *
+ * Reads the previous logic powerstate for a powerdomain. This
+ * function must determine the previous logic powerstate by first
+ * checking the previous powerstate for the domain. If that was OFF,
+ * then logic has been lost. If previous state was RETENTION, the
+ * function reads the setting for the next retention logic state to
+ * see the actual value.  In every other case, the logic is
+ * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
+ * depending whether the logic was retained or not.
+ */
+static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
+{
+	int state;
+
+	state = omap4_pwrdm_read_prev_pwrst(pwrdm);
+
+	if (state == PWRDM_POWER_OFF)
+		return PWRDM_POWER_OFF;
+
+	if (state != PWRDM_POWER_RET)
+		return PWRDM_POWER_RET;
+
+	return omap4_pwrdm_read_logic_retst(pwrdm);
+}
+
+static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+	u32 m, v;
+
+	m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
+
+	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTST);
+	v &= m;
+	v >>= __ffs(m);
+
+	return v;
+}
+
+static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
+{
+	u32 m, v;
+
+	m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
+
+	v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+					OMAP4_PM_PWSTCTRL);
+	v &= m;
+	v >>= __ffs(m);
+
+	return v;
+}
+
+/**
+ * omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate
+ * @pwrdm: struct powerdomain * to read mem powerstate for
+ * @bank: memory bank index
+ *
+ * Reads the previous memory powerstate for a powerdomain. This
+ * function must determine the previous memory powerstate by first
+ * checking the previous powerstate for the domain. If that was OFF,
+ * then logic has been lost. If previous state was RETENTION, the
+ * function reads the setting for the next memory retention state to
+ * see the actual value.  In every other case, the logic is
+ * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
+ * depending whether logic was retained or not.
+ */
+static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+	int state;
+
+	state = omap4_pwrdm_read_prev_pwrst(pwrdm);
+
+	if (state == PWRDM_POWER_OFF)
+		return PWRDM_POWER_OFF;
+
+	if (state != PWRDM_POWER_RET)
+		return PWRDM_POWER_RET;
+
+	return omap4_pwrdm_read_mem_retst(pwrdm, bank);
+}
+
+static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
+{
+	u32 c = 0;
+
+	/*
+	 * REVISIT: pwrdm_wait_transition() may be better implemented
+	 * via a callback and a periodic timer check -- how long do we expect
+	 * powerdomain transitions to take?
+	 */
+
+	/* XXX Is this udelay() value meaningful? */
+	while ((omap4_prminst_read_inst_reg(pwrdm->prcm_partition,
+					    pwrdm->prcm_offs,
+					    OMAP4_PM_PWSTST) &
+		OMAP_INTRANSITION_MASK) &&
+	       (c++ < PWRDM_TRANSITION_BAILOUT))
+		udelay(1);
+
+	if (c > PWRDM_TRANSITION_BAILOUT) {
+		pr_err("powerdomain: %s: waited too long to complete transition\n",
+		       pwrdm->name);
+		return -EAGAIN;
+	}
+
+	pr_debug("powerdomain: completed transition in %d loops\n", c);
+
+	return 0;
+}
+
+struct pwrdm_ops omap4_pwrdm_operations = {
+	.pwrdm_set_next_pwrst	= omap4_pwrdm_set_next_pwrst,
+	.pwrdm_read_next_pwrst	= omap4_pwrdm_read_next_pwrst,
+	.pwrdm_read_pwrst	= omap4_pwrdm_read_pwrst,
+	.pwrdm_read_prev_pwrst	= omap4_pwrdm_read_prev_pwrst,
+	.pwrdm_set_lowpwrstchange	= omap4_pwrdm_set_lowpwrstchange,
+	.pwrdm_clear_all_prev_pwrst	= omap4_pwrdm_clear_all_prev_pwrst,
+	.pwrdm_set_logic_retst	= omap4_pwrdm_set_logic_retst,
+	.pwrdm_read_logic_pwrst	= omap4_pwrdm_read_logic_pwrst,
+	.pwrdm_read_prev_logic_pwrst	= omap4_pwrdm_read_prev_logic_pwrst,
+	.pwrdm_read_logic_retst	= omap4_pwrdm_read_logic_retst,
+	.pwrdm_read_mem_pwrst	= omap4_pwrdm_read_mem_pwrst,
+	.pwrdm_read_mem_retst	= omap4_pwrdm_read_mem_retst,
+	.pwrdm_read_prev_mem_pwrst	= omap4_pwrdm_read_prev_mem_pwrst,
+	.pwrdm_set_mem_onst	= omap4_pwrdm_set_mem_onst,
+	.pwrdm_set_mem_retst	= omap4_pwrdm_set_mem_retst,
+	.pwrdm_wait_transition	= omap4_pwrdm_wait_transition,
+};
+
+
 static int __init omap4xxx_prm_init(void)
 {
 	if (!cpu_is_omap44xx())