arch/arm/mach-omap2/pm34xx.c - kernel/msm-4.9 - Gitiles

 /*
  * OMAP3 Power Management Routines
  *
  * Copyright (C) 2006-2008 Nokia Corporation
  * Tony Lindgren <tony@atomide.com>
  * Jouni Hogander
  *
  * Copyright (C) 2005 Texas Instruments, Inc.
  * Richard Woodruff <r-woodruff2@ti.com>
  *
  * Based on pm.c for omap1
  *
  * 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/pm.h>
 #include <linux/suspend.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/list.h>
 #include <linux/err.h>
 #include <linux/gpio.h>

 #include <mach/sram.h>
 #include <mach/clockdomain.h>
 #include <mach/powerdomain.h>
 #include <mach/control.h>

 #include "cm.h"
 #include "cm-regbits-34xx.h"
 #include "prm-regbits-34xx.h"

 #include "prm.h"
 #include "pm.h"

 struct power_state {
 	struct powerdomain *pwrdm;
 	u32 next_state;
 	u32 saved_state;
 	struct list_head node;
 };

 static LIST_HEAD(pwrst_list);

 static void (*_omap_sram_idle)(u32 *addr, int save_state);

 static struct powerdomain *mpu_pwrdm;

 /* PRCM Interrupt Handler for wakeups */
 static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
 {
 	u32 wkst, irqstatus_mpu;
 	u32 fclk, iclk;

 	/* WKUP */
 	wkst = prm_read_mod_reg(WKUP_MOD, PM_WKST);
 	if (wkst) {
 		iclk = cm_read_mod_reg(WKUP_MOD, CM_ICLKEN);
 		fclk = cm_read_mod_reg(WKUP_MOD, CM_FCLKEN);
 		cm_set_mod_reg_bits(wkst, WKUP_MOD, CM_ICLKEN);
 		cm_set_mod_reg_bits(wkst, WKUP_MOD, CM_FCLKEN);
 		prm_write_mod_reg(wkst, WKUP_MOD, PM_WKST);
 		while (prm_read_mod_reg(WKUP_MOD, PM_WKST))
 			cpu_relax();
 		cm_write_mod_reg(iclk, WKUP_MOD, CM_ICLKEN);
 		cm_write_mod_reg(fclk, WKUP_MOD, CM_FCLKEN);
 	}

 	/* CORE */
 	wkst = prm_read_mod_reg(CORE_MOD, PM_WKST1);
 	if (wkst) {
 		iclk = cm_read_mod_reg(CORE_MOD, CM_ICLKEN1);
 		fclk = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
 		cm_set_mod_reg_bits(wkst, CORE_MOD, CM_ICLKEN1);
 		cm_set_mod_reg_bits(wkst, CORE_MOD, CM_FCLKEN1);
 		prm_write_mod_reg(wkst, CORE_MOD, PM_WKST1);
 		while (prm_read_mod_reg(CORE_MOD, PM_WKST1))
 			cpu_relax();
 		cm_write_mod_reg(iclk, CORE_MOD, CM_ICLKEN1);
 		cm_write_mod_reg(fclk, CORE_MOD, CM_FCLKEN1);
 	}
 	wkst = prm_read_mod_reg(CORE_MOD, OMAP3430ES2_PM_WKST3);
 	if (wkst) {
 		iclk = cm_read_mod_reg(CORE_MOD, CM_ICLKEN3);
 		fclk = cm_read_mod_reg(CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
 		cm_set_mod_reg_bits(wkst, CORE_MOD, CM_ICLKEN3);
 		cm_set_mod_reg_bits(wkst, CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
 		prm_write_mod_reg(wkst, CORE_MOD, OMAP3430ES2_PM_WKST3);
 		while (prm_read_mod_reg(CORE_MOD, OMAP3430ES2_PM_WKST3))
 			cpu_relax();
 		cm_write_mod_reg(iclk, CORE_MOD, CM_ICLKEN3);
 		cm_write_mod_reg(fclk, CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
 	}

 	/* PER */
 	wkst = prm_read_mod_reg(OMAP3430_PER_MOD, PM_WKST);
 	if (wkst) {
 		iclk = cm_read_mod_reg(OMAP3430_PER_MOD, CM_ICLKEN);
 		fclk = cm_read_mod_reg(OMAP3430_PER_MOD, CM_FCLKEN);
 		cm_set_mod_reg_bits(wkst, OMAP3430_PER_MOD, CM_ICLKEN);
 		cm_set_mod_reg_bits(wkst, OMAP3430_PER_MOD, CM_FCLKEN);
 		prm_write_mod_reg(wkst, OMAP3430_PER_MOD, PM_WKST);
 		while (prm_read_mod_reg(OMAP3430_PER_MOD, PM_WKST))
 			cpu_relax();
 		cm_write_mod_reg(iclk, OMAP3430_PER_MOD, CM_ICLKEN);
 		cm_write_mod_reg(fclk, OMAP3430_PER_MOD, CM_FCLKEN);
 	}

 	if (omap_rev() > OMAP3430_REV_ES1_0) {
 		/* USBHOST */
 		wkst = prm_read_mod_reg(OMAP3430ES2_USBHOST_MOD, PM_WKST);
 		if (wkst) {
 			iclk = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
 					       CM_ICLKEN);
 			fclk = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
 					       CM_FCLKEN);
 			cm_set_mod_reg_bits(wkst, OMAP3430ES2_USBHOST_MOD,
 					    CM_ICLKEN);
 			cm_set_mod_reg_bits(wkst, OMAP3430ES2_USBHOST_MOD,
 					    CM_FCLKEN);
 			prm_write_mod_reg(wkst, OMAP3430ES2_USBHOST_MOD,
 					  PM_WKST);
 			while (prm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
 						PM_WKST))
 				cpu_relax();
 			cm_write_mod_reg(iclk, OMAP3430ES2_USBHOST_MOD,
 					 CM_ICLKEN);
 			cm_write_mod_reg(fclk, OMAP3430ES2_USBHOST_MOD,
 					 CM_FCLKEN);
 		}
 	}

 	irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
 					 OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 	prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
 			  OMAP3_PRM_IRQSTATUS_MPU_OFFSET);

 	while (prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET))
 		cpu_relax();

 	return IRQ_HANDLED;
 }

 static void omap_sram_idle(void)
 {
 	/* Variable to tell what needs to be saved and restored
 	 * in omap_sram_idle*/
 	/* save_state = 0 => Nothing to save and restored */
 	/* save_state = 1 => Only L1 and logic lost */
 	/* save_state = 2 => Only L2 lost */
 	/* save_state = 3 => L1, L2 and logic lost */
 	int save_state = 0, mpu_next_state;

 	if (!_omap_sram_idle)
 		return;

 	mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
 	switch (mpu_next_state) {
 	case PWRDM_POWER_RET:
 		/* No need to save context */
 		save_state = 0;
 		break;
 	default:
 		/* Invalid state */
 		printk(KERN_ERR "Invalid mpu state in sram_idle\n");
 		return;
 	}
 	omap2_gpio_prepare_for_retention();

 	_omap_sram_idle(NULL, save_state);
 	cpu_init();

 	omap2_gpio_resume_after_retention();
 }

 /*
  * Check if functional clocks are enabled before entering
  * sleep. This function could be behind CONFIG_PM_DEBUG
  * when all drivers are configuring their sysconfig registers
  * properly and using their clocks properly.
  */
 static int omap3_fclks_active(void)
 {
 	u32 fck_core1 = 0, fck_core3 = 0, fck_sgx = 0, fck_dss = 0,
 		fck_cam = 0, fck_per = 0, fck_usbhost = 0;

 	fck_core1 = cm_read_mod_reg(CORE_MOD,
 				    CM_FCLKEN1);
 	if (omap_rev() > OMAP3430_REV_ES1_0) {
 		fck_core3 = cm_read_mod_reg(CORE_MOD,
 					    OMAP3430ES2_CM_FCLKEN3);
 		fck_sgx = cm_read_mod_reg(OMAP3430ES2_SGX_MOD,
 					  CM_FCLKEN);
 		fck_usbhost = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
 					      CM_FCLKEN);
 	} else
 		fck_sgx = cm_read_mod_reg(GFX_MOD,
 					  OMAP3430ES2_CM_FCLKEN3);
 	fck_dss = cm_read_mod_reg(OMAP3430_DSS_MOD,
 				  CM_FCLKEN);
 	fck_cam = cm_read_mod_reg(OMAP3430_CAM_MOD,
 				  CM_FCLKEN);
 	fck_per = cm_read_mod_reg(OMAP3430_PER_MOD,
 				  CM_FCLKEN);
 	if (fck_core1 | fck_core3 | fck_sgx | fck_dss |
 	    fck_cam | fck_per | fck_usbhost)
 		return 1;
 	return 0;
 }

 static int omap3_can_sleep(void)
 {
 	if (omap3_fclks_active())
 		return 0;
 	return 1;
 }

 /* This sets pwrdm state (other than mpu & core. Currently only ON &
  * RET are supported. Function is assuming that clkdm doesn't have
  * hw_sup mode enabled. */
 static int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
 {
 	u32 cur_state;
 	int sleep_switch = 0;
 	int ret = 0;

 	if (pwrdm == NULL || IS_ERR(pwrdm))
 		return -EINVAL;

 	while (!(pwrdm->pwrsts & (1 << state))) {
 		if (state == PWRDM_POWER_OFF)
 			return ret;
 		state--;
 	}

 	cur_state = pwrdm_read_next_pwrst(pwrdm);
 	if (cur_state == state)
 		return ret;

 	if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
 		omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 		sleep_switch = 1;
 		pwrdm_wait_transition(pwrdm);
 	}

 	ret = pwrdm_set_next_pwrst(pwrdm, state);
 	if (ret) {
 		printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
 		       pwrdm->name);
 		goto err;
 	}

 	if (sleep_switch) {
 		omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 		pwrdm_wait_transition(pwrdm);
 	}

 err:
 	return ret;
 }

 static void omap3_pm_idle(void)
 {
 	local_irq_disable();
 	local_fiq_disable();

 	if (!omap3_can_sleep())
 		goto out;

 	if (omap_irq_pending())
 		goto out;

 	omap_sram_idle();

 out:
 	local_fiq_enable();
 	local_irq_enable();
 }

 static int omap3_pm_prepare(void)
 {
 	disable_hlt();
 	return 0;
 }

 static int omap3_pm_suspend(void)
 {
 	struct power_state *pwrst;
 	int state, ret = 0;

 	/* Read current next_pwrsts */
 	list_for_each_entry(pwrst, &pwrst_list, node)
 		pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
 	/* Set ones wanted by suspend */
 	list_for_each_entry(pwrst, &pwrst_list, node) {
 		if (set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
 			goto restore;
 		if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
 			goto restore;
 	}

 	omap_sram_idle();

 restore:
 	/* Restore next_pwrsts */
 	list_for_each_entry(pwrst, &pwrst_list, node) {
 		set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
 		state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
 		if (state > pwrst->next_state) {
 			printk(KERN_INFO "Powerdomain (%s) didn't enter "
 			       "target state %d\n",
 			       pwrst->pwrdm->name, pwrst->next_state);
 			ret = -1;
 		}
 	}
 	if (ret)
 		printk(KERN_ERR "Could not enter target state in pm_suspend\n");
 	else
 		printk(KERN_INFO "Successfully put all powerdomains "
 		       "to target state\n");

 	return ret;
 }

 static int omap3_pm_enter(suspend_state_t state)
 {
 	int ret = 0;

 	switch (state) {
 	case PM_SUSPEND_STANDBY:
 	case PM_SUSPEND_MEM:
 		ret = omap3_pm_suspend();
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 static void omap3_pm_finish(void)
 {
 	enable_hlt();
 }

 static struct platform_suspend_ops omap_pm_ops = {
 	.prepare	= omap3_pm_prepare,
 	.enter		= omap3_pm_enter,
 	.finish		= omap3_pm_finish,
 	.valid		= suspend_valid_only_mem,
 };

 static void __init prcm_setup_regs(void)
 {
 	/* reset modem */
 	prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON |
 			  OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST,
 			  CORE_MOD, RM_RSTCTRL);
 	prm_write_mod_reg(0, CORE_MOD, RM_RSTCTRL);

 	/* XXX Reset all wkdeps. This should be done when initializing
 	 * powerdomains */
 	prm_write_mod_reg(0, OMAP3430_IVA2_MOD, PM_WKDEP);
 	prm_write_mod_reg(0, MPU_MOD, PM_WKDEP);
 	prm_write_mod_reg(0, OMAP3430_DSS_MOD, PM_WKDEP);
 	prm_write_mod_reg(0, OMAP3430_NEON_MOD, PM_WKDEP);
 	prm_write_mod_reg(0, OMAP3430_CAM_MOD, PM_WKDEP);
 	prm_write_mod_reg(0, OMAP3430_PER_MOD, PM_WKDEP);
 	if (omap_rev() > OMAP3430_REV_ES1_0) {
 		prm_write_mod_reg(0, OMAP3430ES2_SGX_MOD, PM_WKDEP);
 		prm_write_mod_reg(0, OMAP3430ES2_USBHOST_MOD, PM_WKDEP);
 	} else
 		prm_write_mod_reg(0, GFX_MOD, PM_WKDEP);

 	/*
 	 * Enable interface clock autoidle for all modules.
 	 * Note that in the long run this should be done by clockfw
 	 */
 	cm_write_mod_reg(
 		OMAP3430ES2_AUTO_MMC3 |
 		OMAP3430ES2_AUTO_ICR |
 		OMAP3430_AUTO_AES2 |
 		OMAP3430_AUTO_SHA12 |
 		OMAP3430_AUTO_DES2 |
 		OMAP3430_AUTO_MMC2 |
 		OMAP3430_AUTO_MMC1 |
 		OMAP3430_AUTO_MSPRO |
 		OMAP3430_AUTO_HDQ |
 		OMAP3430_AUTO_MCSPI4 |
 		OMAP3430_AUTO_MCSPI3 |
 		OMAP3430_AUTO_MCSPI2 |
 		OMAP3430_AUTO_MCSPI1 |
 		OMAP3430_AUTO_I2C3 |
 		OMAP3430_AUTO_I2C2 |
 		OMAP3430_AUTO_I2C1 |
 		OMAP3430_AUTO_UART2 |
 		OMAP3430_AUTO_UART1 |
 		OMAP3430_AUTO_GPT11 |
 		OMAP3430_AUTO_GPT10 |
 		OMAP3430_AUTO_MCBSP5 |
 		OMAP3430_AUTO_MCBSP1 |
 		OMAP3430ES1_AUTO_FAC | /* This is es1 only */
 		OMAP3430_AUTO_MAILBOXES |
 		OMAP3430_AUTO_OMAPCTRL |
 		OMAP3430ES1_AUTO_FSHOSTUSB |
 		OMAP3430_AUTO_HSOTGUSB |
 		OMAP3430ES1_AUTO_D2D | /* This is es1 only */
 		OMAP3430_AUTO_SSI,
 		CORE_MOD, CM_AUTOIDLE1);

 	cm_write_mod_reg(
 		OMAP3430_AUTO_PKA |
 		OMAP3430_AUTO_AES1 |
 		OMAP3430_AUTO_RNG |
 		OMAP3430_AUTO_SHA11 |
 		OMAP3430_AUTO_DES1,
 		CORE_MOD, CM_AUTOIDLE2);

 	if (omap_rev() > OMAP3430_REV_ES1_0) {
 		cm_write_mod_reg(
 			OMAP3430ES2_AUTO_USBTLL,
 			CORE_MOD, CM_AUTOIDLE3);
 	}

 	cm_write_mod_reg(
 		OMAP3430_AUTO_WDT2 |
 		OMAP3430_AUTO_WDT1 |
 		OMAP3430_AUTO_GPIO1 |
 		OMAP3430_AUTO_32KSYNC |
 		OMAP3430_AUTO_GPT12 |
 		OMAP3430_AUTO_GPT1 ,
 		WKUP_MOD, CM_AUTOIDLE);

 	cm_write_mod_reg(
 		OMAP3430_AUTO_DSS,
 		OMAP3430_DSS_MOD,
 		CM_AUTOIDLE);

 	cm_write_mod_reg(
 		OMAP3430_AUTO_CAM,
 		OMAP3430_CAM_MOD,
 		CM_AUTOIDLE);

 	cm_write_mod_reg(
 		OMAP3430_AUTO_GPIO6 |
 		OMAP3430_AUTO_GPIO5 |
 		OMAP3430_AUTO_GPIO4 |
 		OMAP3430_AUTO_GPIO3 |
 		OMAP3430_AUTO_GPIO2 |
 		OMAP3430_AUTO_WDT3 |
 		OMAP3430_AUTO_UART3 |
 		OMAP3430_AUTO_GPT9 |
 		OMAP3430_AUTO_GPT8 |
 		OMAP3430_AUTO_GPT7 |
 		OMAP3430_AUTO_GPT6 |
 		OMAP3430_AUTO_GPT5 |
 		OMAP3430_AUTO_GPT4 |
 		OMAP3430_AUTO_GPT3 |
 		OMAP3430_AUTO_GPT2 |
 		OMAP3430_AUTO_MCBSP4 |
 		OMAP3430_AUTO_MCBSP3 |
 		OMAP3430_AUTO_MCBSP2,
 		OMAP3430_PER_MOD,
 		CM_AUTOIDLE);

 	if (omap_rev() > OMAP3430_REV_ES1_0) {
 		cm_write_mod_reg(
 			OMAP3430ES2_AUTO_USBHOST,
 			OMAP3430ES2_USBHOST_MOD,
 			CM_AUTOIDLE);
 	}

 	/*
 	 * Set all plls to autoidle. This is needed until autoidle is
 	 * enabled by clockfw
 	 */
 	cm_write_mod_reg(1 << OMAP3430_AUTO_IVA2_DPLL_SHIFT,
 			 OMAP3430_IVA2_MOD, CM_AUTOIDLE2);
 	cm_write_mod_reg(1 << OMAP3430_AUTO_MPU_DPLL_SHIFT,
 			 MPU_MOD,
 			 CM_AUTOIDLE2);
 	cm_write_mod_reg((1 << OMAP3430_AUTO_PERIPH_DPLL_SHIFT) |
 			 (1 << OMAP3430_AUTO_CORE_DPLL_SHIFT),
 			 PLL_MOD,
 			 CM_AUTOIDLE);
 	cm_write_mod_reg(1 << OMAP3430ES2_AUTO_PERIPH2_DPLL_SHIFT,
 			 PLL_MOD,
 			 CM_AUTOIDLE2);

 	/*
 	 * Enable control of expternal oscillator through
 	 * sys_clkreq. In the long run clock framework should
 	 * take care of this.
 	 */
 	prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
 			     1 << OMAP_AUTOEXTCLKMODE_SHIFT,
 			     OMAP3430_GR_MOD,
 			     OMAP3_PRM_CLKSRC_CTRL_OFFSET);

 	/* setup wakup source */
 	prm_write_mod_reg(OMAP3430_EN_IO | OMAP3430_EN_GPIO1 |
 			  OMAP3430_EN_GPT1 | OMAP3430_EN_GPT12,
 			  WKUP_MOD, PM_WKEN);
 	/* No need to write EN_IO, that is always enabled */
 	prm_write_mod_reg(OMAP3430_EN_GPIO1 | OMAP3430_EN_GPT1 |
 			  OMAP3430_EN_GPT12,
 			  WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
 	/* For some reason IO doesn't generate wakeup event even if
 	 * it is selected to mpu wakeup goup */
 	prm_write_mod_reg(OMAP3430_IO_EN | OMAP3430_WKUP_EN,
 			  OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 }

 static int __init pwrdms_setup(struct powerdomain *pwrdm)
 {
 	struct power_state *pwrst;

 	if (!pwrdm->pwrsts)
 		return 0;

 	pwrst = kmalloc(sizeof(struct power_state), GFP_KERNEL);
 	if (!pwrst)
 		return -ENOMEM;
 	pwrst->pwrdm = pwrdm;
 	pwrst->next_state = PWRDM_POWER_RET;
 	list_add(&pwrst->node, &pwrst_list);

 	if (pwrdm_has_hdwr_sar(pwrdm))
 		pwrdm_enable_hdwr_sar(pwrdm);

 	return set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
 }

 /*
  * Enable hw supervised mode for all clockdomains if it's
  * supported. Initiate sleep transition for other clockdomains, if
  * they are not used
  */
 static int __init clkdms_setup(struct clockdomain *clkdm)
 {
 	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
 		omap2_clkdm_allow_idle(clkdm);
 	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
 		 atomic_read(&clkdm->usecount) == 0)
 		omap2_clkdm_sleep(clkdm);
 	return 0;
 }

 int __init omap3_pm_init(void)
 {
 	struct power_state *pwrst, *tmp;
 	int ret;

 	if (!cpu_is_omap34xx())
 		return -ENODEV;

 	printk(KERN_ERR "Power Management for TI OMAP3.\n");

 	/* XXX prcm_setup_regs needs to be before enabling hw
 	 * supervised mode for powerdomains */
 	prcm_setup_regs();

 	ret = request_irq(INT_34XX_PRCM_MPU_IRQ,
 			  (irq_handler_t)prcm_interrupt_handler,
 			  IRQF_DISABLED, "prcm", NULL);
 	if (ret) {
 		printk(KERN_ERR "request_irq failed to register for 0x%x\n",
 		       INT_34XX_PRCM_MPU_IRQ);
 		goto err1;
 	}

 	ret = pwrdm_for_each(pwrdms_setup);
 	if (ret) {
 		printk(KERN_ERR "Failed to setup powerdomains\n");
 		goto err2;
 	}

 	(void) clkdm_for_each(clkdms_setup);

 	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
 	if (mpu_pwrdm == NULL) {
 		printk(KERN_ERR "Failed to get mpu_pwrdm\n");
 		goto err2;
 	}

 	_omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend,
 					 omap34xx_cpu_suspend_sz);

 	suspend_set_ops(&omap_pm_ops);

 	pm_idle = omap3_pm_idle;

 err1:
 	return ret;
 err2:
 	free_irq(INT_34XX_PRCM_MPU_IRQ, NULL);
 	list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
 		list_del(&pwrst->node);
 		kfree(pwrst);
 	}
 	return ret;
 }

 late_initcall(omap3_pm_init);
	/*
	* OMAP3 Power Management Routines
	*
	* Copyright (C) 2006-2008 Nokia Corporation
	* Tony Lindgren <tony@atomide.com>
	* Jouni Hogander
	*
	* Copyright (C) 2005 Texas Instruments, Inc.
	* Richard Woodruff <r-woodruff2@ti.com>
	*
	* Based on pm.c for omap1
	*
	* 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/pm.h>
	#include <linux/suspend.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/list.h>
	#include <linux/err.h>
	#include <linux/gpio.h>

	#include <mach/sram.h>
	#include <mach/clockdomain.h>
	#include <mach/powerdomain.h>
	#include <mach/control.h>

	#include "cm.h"
	#include "cm-regbits-34xx.h"
	#include "prm-regbits-34xx.h"

	#include "prm.h"
	#include "pm.h"

	struct power_state {
	struct powerdomain *pwrdm;
	u32 next_state;
	u32 saved_state;
	struct list_head node;
	};

	static LIST_HEAD(pwrst_list);

	static void (_omap_sram_idle)(u32 addr, int save_state);

	static struct powerdomain *mpu_pwrdm;

	/* PRCM Interrupt Handler for wakeups */
	static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
	{
	u32 wkst, irqstatus_mpu;
	u32 fclk, iclk;

	/* WKUP */
	wkst = prm_read_mod_reg(WKUP_MOD, PM_WKST);
	if (wkst) {
	iclk = cm_read_mod_reg(WKUP_MOD, CM_ICLKEN);
	fclk = cm_read_mod_reg(WKUP_MOD, CM_FCLKEN);
	cm_set_mod_reg_bits(wkst, WKUP_MOD, CM_ICLKEN);
	cm_set_mod_reg_bits(wkst, WKUP_MOD, CM_FCLKEN);
	prm_write_mod_reg(wkst, WKUP_MOD, PM_WKST);
	while (prm_read_mod_reg(WKUP_MOD, PM_WKST))
	cpu_relax();
	cm_write_mod_reg(iclk, WKUP_MOD, CM_ICLKEN);
	cm_write_mod_reg(fclk, WKUP_MOD, CM_FCLKEN);
	}

	/* CORE */
	wkst = prm_read_mod_reg(CORE_MOD, PM_WKST1);
	if (wkst) {
	iclk = cm_read_mod_reg(CORE_MOD, CM_ICLKEN1);
	fclk = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	cm_set_mod_reg_bits(wkst, CORE_MOD, CM_ICLKEN1);
	cm_set_mod_reg_bits(wkst, CORE_MOD, CM_FCLKEN1);
	prm_write_mod_reg(wkst, CORE_MOD, PM_WKST1);
	while (prm_read_mod_reg(CORE_MOD, PM_WKST1))
	cpu_relax();
	cm_write_mod_reg(iclk, CORE_MOD, CM_ICLKEN1);
	cm_write_mod_reg(fclk, CORE_MOD, CM_FCLKEN1);
	}
	wkst = prm_read_mod_reg(CORE_MOD, OMAP3430ES2_PM_WKST3);
	if (wkst) {
	iclk = cm_read_mod_reg(CORE_MOD, CM_ICLKEN3);
	fclk = cm_read_mod_reg(CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
	cm_set_mod_reg_bits(wkst, CORE_MOD, CM_ICLKEN3);
	cm_set_mod_reg_bits(wkst, CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
	prm_write_mod_reg(wkst, CORE_MOD, OMAP3430ES2_PM_WKST3);
	while (prm_read_mod_reg(CORE_MOD, OMAP3430ES2_PM_WKST3))
	cpu_relax();
	cm_write_mod_reg(iclk, CORE_MOD, CM_ICLKEN3);
	cm_write_mod_reg(fclk, CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
	}

	/* PER */
	wkst = prm_read_mod_reg(OMAP3430_PER_MOD, PM_WKST);
	if (wkst) {
	iclk = cm_read_mod_reg(OMAP3430_PER_MOD, CM_ICLKEN);
	fclk = cm_read_mod_reg(OMAP3430_PER_MOD, CM_FCLKEN);
	cm_set_mod_reg_bits(wkst, OMAP3430_PER_MOD, CM_ICLKEN);
	cm_set_mod_reg_bits(wkst, OMAP3430_PER_MOD, CM_FCLKEN);
	prm_write_mod_reg(wkst, OMAP3430_PER_MOD, PM_WKST);
	while (prm_read_mod_reg(OMAP3430_PER_MOD, PM_WKST))
	cpu_relax();
	cm_write_mod_reg(iclk, OMAP3430_PER_MOD, CM_ICLKEN);
	cm_write_mod_reg(fclk, OMAP3430_PER_MOD, CM_FCLKEN);
	}

	if (omap_rev() > OMAP3430_REV_ES1_0) {
	/* USBHOST */
	wkst = prm_read_mod_reg(OMAP3430ES2_USBHOST_MOD, PM_WKST);
	if (wkst) {
	iclk = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
	CM_ICLKEN);
	fclk = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
	CM_FCLKEN);
	cm_set_mod_reg_bits(wkst, OMAP3430ES2_USBHOST_MOD,
	CM_ICLKEN);
	cm_set_mod_reg_bits(wkst, OMAP3430ES2_USBHOST_MOD,
	CM_FCLKEN);
	prm_write_mod_reg(wkst, OMAP3430ES2_USBHOST_MOD,
	PM_WKST);
	while (prm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
	PM_WKST))
	cpu_relax();
	cm_write_mod_reg(iclk, OMAP3430ES2_USBHOST_MOD,
	CM_ICLKEN);
	cm_write_mod_reg(fclk, OMAP3430ES2_USBHOST_MOD,
	CM_FCLKEN);
	}
	}

	irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
	OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
	prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
	OMAP3_PRM_IRQSTATUS_MPU_OFFSET);

	while (prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET))
	cpu_relax();

	return IRQ_HANDLED;
	}

	static void omap_sram_idle(void)
	{
	/* Variable to tell what needs to be saved and restored
	* in omap_sram_idle*/
	/* save_state = 0 => Nothing to save and restored */
	/* save_state = 1 => Only L1 and logic lost */
	/* save_state = 2 => Only L2 lost */
	/* save_state = 3 => L1, L2 and logic lost */
	int save_state = 0, mpu_next_state;

	if (!_omap_sram_idle)
	return;

	mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
	switch (mpu_next_state) {
	case PWRDM_POWER_RET:
	/* No need to save context */
	save_state = 0;
	break;
	default:
	/* Invalid state */
	printk(KERN_ERR "Invalid mpu state in sram_idle\n");
	return;
	}
	omap2_gpio_prepare_for_retention();

	_omap_sram_idle(NULL, save_state);
	cpu_init();

	omap2_gpio_resume_after_retention();
	}

	/*
	* Check if functional clocks are enabled before entering
	* sleep. This function could be behind CONFIG_PM_DEBUG
	* when all drivers are configuring their sysconfig registers
	* properly and using their clocks properly.
	*/
	static int omap3_fclks_active(void)
	{
	u32 fck_core1 = 0, fck_core3 = 0, fck_sgx = 0, fck_dss = 0,
	fck_cam = 0, fck_per = 0, fck_usbhost = 0;

	fck_core1 = cm_read_mod_reg(CORE_MOD,
	CM_FCLKEN1);
	if (omap_rev() > OMAP3430_REV_ES1_0) {
	fck_core3 = cm_read_mod_reg(CORE_MOD,
	OMAP3430ES2_CM_FCLKEN3);
	fck_sgx = cm_read_mod_reg(OMAP3430ES2_SGX_MOD,
	CM_FCLKEN);
	fck_usbhost = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
	CM_FCLKEN);
	} else
	fck_sgx = cm_read_mod_reg(GFX_MOD,
	OMAP3430ES2_CM_FCLKEN3);
	fck_dss = cm_read_mod_reg(OMAP3430_DSS_MOD,
	CM_FCLKEN);
	fck_cam = cm_read_mod_reg(OMAP3430_CAM_MOD,
	CM_FCLKEN);
	fck_per = cm_read_mod_reg(OMAP3430_PER_MOD,
	CM_FCLKEN);
	if (fck_core1 \| fck_core3 \| fck_sgx \| fck_dss \|
	fck_cam \| fck_per \| fck_usbhost)
	return 1;
	return 0;
	}

	static int omap3_can_sleep(void)
	{
	if (omap3_fclks_active())
	return 0;
	return 1;
	}

	/* This sets pwrdm state (other than mpu & core. Currently only ON &
	* RET are supported. Function is assuming that clkdm doesn't have
	* hw_sup mode enabled. */
	static int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
	{
	u32 cur_state;
	int sleep_switch = 0;
	int ret = 0;

	if (pwrdm == NULL \|\| IS_ERR(pwrdm))
	return -EINVAL;

	while (!(pwrdm->pwrsts & (1 << state))) {
	if (state == PWRDM_POWER_OFF)
	return ret;
	state--;
	}

	cur_state = pwrdm_read_next_pwrst(pwrdm);
	if (cur_state == state)
	return ret;

	if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
	omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
	sleep_switch = 1;
	pwrdm_wait_transition(pwrdm);
	}

	ret = pwrdm_set_next_pwrst(pwrdm, state);
	if (ret) {
	printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
	pwrdm->name);
	goto err;
	}

	if (sleep_switch) {
	omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
	pwrdm_wait_transition(pwrdm);
	}

	err:
	return ret;
	}

	static void omap3_pm_idle(void)
	{
	local_irq_disable();
	local_fiq_disable();

	if (!omap3_can_sleep())
	goto out;

	if (omap_irq_pending())
	goto out;

	omap_sram_idle();

	out:
	local_fiq_enable();
	local_irq_enable();
	}

	static int omap3_pm_prepare(void)
	{
	disable_hlt();
	return 0;
	}

	static int omap3_pm_suspend(void)
	{
	struct power_state *pwrst;
	int state, ret = 0;

	/* Read current next_pwrsts */
	list_for_each_entry(pwrst, &pwrst_list, node)
	pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
	/* Set ones wanted by suspend */
	list_for_each_entry(pwrst, &pwrst_list, node) {
	if (set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
	goto restore;
	if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
	goto restore;
	}

	omap_sram_idle();

	restore:
	/* Restore next_pwrsts */
	list_for_each_entry(pwrst, &pwrst_list, node) {
	set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
	state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
	if (state > pwrst->next_state) {
	printk(KERN_INFO "Powerdomain (%s) didn't enter "
	"target state %d\n",
	pwrst->pwrdm->name, pwrst->next_state);
	ret = -1;
	}
	}
	if (ret)
	printk(KERN_ERR "Could not enter target state in pm_suspend\n");
	else
	printk(KERN_INFO "Successfully put all powerdomains "
	"to target state\n");

	return ret;
	}

	static int omap3_pm_enter(suspend_state_t state)
	{
	int ret = 0;

	switch (state) {
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
	ret = omap3_pm_suspend();
	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

	static void omap3_pm_finish(void)
	{
	enable_hlt();
	}

	static struct platform_suspend_ops omap_pm_ops = {
	.prepare = omap3_pm_prepare,
	.enter = omap3_pm_enter,
	.finish = omap3_pm_finish,
	.valid = suspend_valid_only_mem,
	};

	static void __init prcm_setup_regs(void)
	{
	/* reset modem */
	prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON \|
	OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST,
	CORE_MOD, RM_RSTCTRL);
	prm_write_mod_reg(0, CORE_MOD, RM_RSTCTRL);

	/* XXX Reset all wkdeps. This should be done when initializing
	* powerdomains */
	prm_write_mod_reg(0, OMAP3430_IVA2_MOD, PM_WKDEP);
	prm_write_mod_reg(0, MPU_MOD, PM_WKDEP);
	prm_write_mod_reg(0, OMAP3430_DSS_MOD, PM_WKDEP);
	prm_write_mod_reg(0, OMAP3430_NEON_MOD, PM_WKDEP);
	prm_write_mod_reg(0, OMAP3430_CAM_MOD, PM_WKDEP);
	prm_write_mod_reg(0, OMAP3430_PER_MOD, PM_WKDEP);
	if (omap_rev() > OMAP3430_REV_ES1_0) {
	prm_write_mod_reg(0, OMAP3430ES2_SGX_MOD, PM_WKDEP);
	prm_write_mod_reg(0, OMAP3430ES2_USBHOST_MOD, PM_WKDEP);
	} else
	prm_write_mod_reg(0, GFX_MOD, PM_WKDEP);

	/*
	* Enable interface clock autoidle for all modules.
	* Note that in the long run this should be done by clockfw
	*/
	cm_write_mod_reg(
	OMAP3430ES2_AUTO_MMC3 \|
	OMAP3430ES2_AUTO_ICR \|
	OMAP3430_AUTO_AES2 \|
	OMAP3430_AUTO_SHA12 \|
	OMAP3430_AUTO_DES2 \|
	OMAP3430_AUTO_MMC2 \|
	OMAP3430_AUTO_MMC1 \|
	OMAP3430_AUTO_MSPRO \|
	OMAP3430_AUTO_HDQ \|
	OMAP3430_AUTO_MCSPI4 \|
	OMAP3430_AUTO_MCSPI3 \|
	OMAP3430_AUTO_MCSPI2 \|
	OMAP3430_AUTO_MCSPI1 \|
	OMAP3430_AUTO_I2C3 \|
	OMAP3430_AUTO_I2C2 \|
	OMAP3430_AUTO_I2C1 \|
	OMAP3430_AUTO_UART2 \|
	OMAP3430_AUTO_UART1 \|
	OMAP3430_AUTO_GPT11 \|
	OMAP3430_AUTO_GPT10 \|
	OMAP3430_AUTO_MCBSP5 \|
	OMAP3430_AUTO_MCBSP1 \|
	OMAP3430ES1_AUTO_FAC \| /* This is es1 only */
	OMAP3430_AUTO_MAILBOXES \|
	OMAP3430_AUTO_OMAPCTRL \|
	OMAP3430ES1_AUTO_FSHOSTUSB \|
	OMAP3430_AUTO_HSOTGUSB \|
	OMAP3430ES1_AUTO_D2D \| /* This is es1 only */
	OMAP3430_AUTO_SSI,
	CORE_MOD, CM_AUTOIDLE1);

	cm_write_mod_reg(
	OMAP3430_AUTO_PKA \|
	OMAP3430_AUTO_AES1 \|
	OMAP3430_AUTO_RNG \|
	OMAP3430_AUTO_SHA11 \|
	OMAP3430_AUTO_DES1,
	CORE_MOD, CM_AUTOIDLE2);

	if (omap_rev() > OMAP3430_REV_ES1_0) {
	cm_write_mod_reg(
	OMAP3430ES2_AUTO_USBTLL,
	CORE_MOD, CM_AUTOIDLE3);
	}

	cm_write_mod_reg(
	OMAP3430_AUTO_WDT2 \|
	OMAP3430_AUTO_WDT1 \|
	OMAP3430_AUTO_GPIO1 \|
	OMAP3430_AUTO_32KSYNC \|
	OMAP3430_AUTO_GPT12 \|
	OMAP3430_AUTO_GPT1 ,
	WKUP_MOD, CM_AUTOIDLE);

	cm_write_mod_reg(
	OMAP3430_AUTO_DSS,
	OMAP3430_DSS_MOD,
	CM_AUTOIDLE);

	cm_write_mod_reg(
	OMAP3430_AUTO_CAM,
	OMAP3430_CAM_MOD,
	CM_AUTOIDLE);

	cm_write_mod_reg(
	OMAP3430_AUTO_GPIO6 \|
	OMAP3430_AUTO_GPIO5 \|
	OMAP3430_AUTO_GPIO4 \|
	OMAP3430_AUTO_GPIO3 \|
	OMAP3430_AUTO_GPIO2 \|
	OMAP3430_AUTO_WDT3 \|
	OMAP3430_AUTO_UART3 \|
	OMAP3430_AUTO_GPT9 \|
	OMAP3430_AUTO_GPT8 \|
	OMAP3430_AUTO_GPT7 \|
	OMAP3430_AUTO_GPT6 \|
	OMAP3430_AUTO_GPT5 \|
	OMAP3430_AUTO_GPT4 \|
	OMAP3430_AUTO_GPT3 \|
	OMAP3430_AUTO_GPT2 \|
	OMAP3430_AUTO_MCBSP4 \|
	OMAP3430_AUTO_MCBSP3 \|
	OMAP3430_AUTO_MCBSP2,
	OMAP3430_PER_MOD,
	CM_AUTOIDLE);

	if (omap_rev() > OMAP3430_REV_ES1_0) {
	cm_write_mod_reg(
	OMAP3430ES2_AUTO_USBHOST,
	OMAP3430ES2_USBHOST_MOD,
	CM_AUTOIDLE);
	}

	/*
	* Set all plls to autoidle. This is needed until autoidle is
	* enabled by clockfw
	*/
	cm_write_mod_reg(1 << OMAP3430_AUTO_IVA2_DPLL_SHIFT,
	OMAP3430_IVA2_MOD, CM_AUTOIDLE2);
	cm_write_mod_reg(1 << OMAP3430_AUTO_MPU_DPLL_SHIFT,
	MPU_MOD,
	CM_AUTOIDLE2);
	cm_write_mod_reg((1 << OMAP3430_AUTO_PERIPH_DPLL_SHIFT) \|
	(1 << OMAP3430_AUTO_CORE_DPLL_SHIFT),
	PLL_MOD,
	CM_AUTOIDLE);
	cm_write_mod_reg(1 << OMAP3430ES2_AUTO_PERIPH2_DPLL_SHIFT,
	PLL_MOD,
	CM_AUTOIDLE2);

	/*
	* Enable control of expternal oscillator through
	* sys_clkreq. In the long run clock framework should
	* take care of this.
	*/
	prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
	1 << OMAP_AUTOEXTCLKMODE_SHIFT,
	OMAP3430_GR_MOD,
	OMAP3_PRM_CLKSRC_CTRL_OFFSET);

	/* setup wakup source */
	prm_write_mod_reg(OMAP3430_EN_IO \| OMAP3430_EN_GPIO1 \|
	OMAP3430_EN_GPT1 \| OMAP3430_EN_GPT12,
	WKUP_MOD, PM_WKEN);
	/* No need to write EN_IO, that is always enabled */
	prm_write_mod_reg(OMAP3430_EN_GPIO1 \| OMAP3430_EN_GPT1 \|
	OMAP3430_EN_GPT12,
	WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
	/* For some reason IO doesn't generate wakeup event even if
	* it is selected to mpu wakeup goup */
	prm_write_mod_reg(OMAP3430_IO_EN \| OMAP3430_WKUP_EN,
	OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
	}

	static int __init pwrdms_setup(struct powerdomain *pwrdm)
	{
	struct power_state *pwrst;

	if (!pwrdm->pwrsts)
	return 0;

	pwrst = kmalloc(sizeof(struct power_state), GFP_KERNEL);
	if (!pwrst)
	return -ENOMEM;
	pwrst->pwrdm = pwrdm;
	pwrst->next_state = PWRDM_POWER_RET;
	list_add(&pwrst->node, &pwrst_list);

	if (pwrdm_has_hdwr_sar(pwrdm))
	pwrdm_enable_hdwr_sar(pwrdm);

	return set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
	}

	/*
	* Enable hw supervised mode for all clockdomains if it's
	* supported. Initiate sleep transition for other clockdomains, if
	* they are not used
	*/
	static int __init clkdms_setup(struct clockdomain *clkdm)
	{
	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
	omap2_clkdm_allow_idle(clkdm);
	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
	atomic_read(&clkdm->usecount) == 0)
	omap2_clkdm_sleep(clkdm);
	return 0;
	}

	int __init omap3_pm_init(void)
	{
	struct power_state pwrst, tmp;
	int ret;

	if (!cpu_is_omap34xx())
	return -ENODEV;

	printk(KERN_ERR "Power Management for TI OMAP3.\n");

	/* XXX prcm_setup_regs needs to be before enabling hw
	* supervised mode for powerdomains */
	prcm_setup_regs();

	ret = request_irq(INT_34XX_PRCM_MPU_IRQ,
	(irq_handler_t)prcm_interrupt_handler,
	IRQF_DISABLED, "prcm", NULL);
	if (ret) {
	printk(KERN_ERR "request_irq failed to register for 0x%x\n",
	INT_34XX_PRCM_MPU_IRQ);
	goto err1;
	}

	ret = pwrdm_for_each(pwrdms_setup);
	if (ret) {
	printk(KERN_ERR "Failed to setup powerdomains\n");
	goto err2;
	}

	(void) clkdm_for_each(clkdms_setup);

	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
	if (mpu_pwrdm == NULL) {
	printk(KERN_ERR "Failed to get mpu_pwrdm\n");
	goto err2;
	}

	_omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend,
	omap34xx_cpu_suspend_sz);

	suspend_set_ops(&omap_pm_ops);

	pm_idle = omap3_pm_idle;

	err1:
	return ret;
	err2:
	free_irq(INT_34XX_PRCM_MPU_IRQ, NULL);
	list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
	list_del(&pwrst->node);
	kfree(pwrst);
	}
	return ret;
	}

	late_initcall(omap3_pm_init);