OMAP3: SR: Reset voltage level on SR disable

[linux-ginger.git] / arch / arm / mach-omap2 / pm34xx.c

/*
 * OMAP3 Power Management Routines
 *
 * Copyright (C) 2006-2008 Nokia Corporation
 * Tony Lindgren <tony@atomide.com>
 * Jouni Hogander
 *
 * Copyright (C) 2007 Texas Instruments, Inc.
 * Rajendra Nayak <rnayak@ti.com>
 *
 * 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 <linux/clk.h>

#include <plat/sram.h>
#include <plat/clockdomain.h>
#include <plat/powerdomain.h>
#include <plat/control.h>
#include <plat/serial.h>
#include <plat/sdrc.h>
#include <plat/prcm.h>
#include <plat/gpmc.h>
#include <plat/dma.h>
#include <plat/dmtimer.h>

#include <asm/tlbflush.h>

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

#include "smartreflex.h"
#include "prm.h"
#include "pm.h"
#include "sdrc.h"

/* Scratchpad offsets */
#define OMAP343X_TABLE_ADDRESS_OFFSET      0x31
#define OMAP343X_TABLE_VALUE_OFFSET        0x30
#define OMAP343X_CONTROL_REG_VALUE_OFFSET  0x32

u32 enable_off_mode;
u32 sleep_while_idle;
u32 wakeup_timer_seconds;

struct power_state {
        struct powerdomain *pwrdm;
        u32 next_state;
#ifdef CONFIG_SUSPEND
        u32 saved_state;
#endif
        struct list_head node;
};

static LIST_HEAD(pwrst_list);

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

static int (*_omap_save_secure_sram)(u32 *addr);

static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;
static struct powerdomain *cam_pwrdm;

static inline void omap3_per_save_context(void)
{
        omap_gpio_save_context();
}

static inline void omap3_per_restore_context(void)
{
        omap_gpio_restore_context();
}

static void omap3_enable_io_chain(void)
{
        int timeout = 0;

        if (omap_rev() >= OMAP3430_REV_ES3_1) {
                prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN, WKUP_MOD, PM_WKEN);
                /* Do a readback to assure write has been done */
                prm_read_mod_reg(WKUP_MOD, PM_WKEN);

                while (!(prm_read_mod_reg(WKUP_MOD, PM_WKST) &
                         OMAP3430_ST_IO_CHAIN)) {
                        timeout++;
                        if (timeout > 1000) {
                                printk(KERN_ERR "Wake up daisy chain "
                                       "activation failed.\n");
                                return;
                        }
                        prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN,
                                             WKUP_MOD, PM_WKST);
                }
        }
}

static void omap3_disable_io_chain(void)
{
        if (omap_rev() >= OMAP3430_REV_ES3_1)
                prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN, WKUP_MOD, PM_WKEN);
}

static void omap3_core_save_context(void)
{
        u32 control_padconf_off;

        /* Save the padconf registers */
        control_padconf_off = omap_ctrl_readl(OMAP343X_CONTROL_PADCONF_OFF);
        control_padconf_off |= START_PADCONF_SAVE;
        omap_ctrl_writel(control_padconf_off, OMAP343X_CONTROL_PADCONF_OFF);
        /* wait for the save to complete */
        while (!omap_ctrl_readl(OMAP343X_CONTROL_GENERAL_PURPOSE_STATUS)
                        & PADCONF_SAVE_DONE)
                ;
        /* Save the Interrupt controller context */
        omap_intc_save_context();
        /* Save the GPMC context */
        omap3_gpmc_save_context();
        /* Save the system control module context, padconf already save above*/
        omap3_control_save_context();
        omap_dma_global_context_save();
}

static void omap3_core_restore_context(void)
{
        /* Restore the control module context, padconf restored by h/w */
        omap3_control_restore_context();
        /* Restore the GPMC context */
        omap3_gpmc_restore_context();
        /* Restore the interrupt controller context */
        omap_intc_restore_context();
        omap_dma_global_context_restore();
}

/*
 * FIXME: This function should be called before entering off-mode after
 * OMAP3 secure services have been accessed. Currently it is only called
 * once during boot sequence, but this works as we are not using secure
 * services.
 */
static void omap3_save_secure_ram_context(u32 target_mpu_state)
{
        u32 ret;

        if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
                /*
                 * MPU next state must be set to POWER_ON temporarily,
                 * otherwise the WFI executed inside the ROM code
                 * will hang the system.
                 */
                pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
                ret = _omap_save_secure_sram((u32 *)
                                __pa(omap3_secure_ram_storage));
                pwrdm_set_next_pwrst(mpu_pwrdm, target_mpu_state);
                /* Following is for error tracking, it should not happen */
                if (ret) {
                        printk(KERN_ERR "save_secure_sram() returns %08x\n",
                                ret);
                        while (1)
                                ;
                }
        }
}

/*
 * PRCM Interrupt Handler Helper Function
 *
 * The purpose of this function is to clear any wake-up events latched
 * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
 * may occur whilst attempting to clear a PM_WKST_x register and thus
 * set another bit in this register. A while loop is used to ensure
 * that any peripheral wake-up events occurring while attempting to
 * clear the PM_WKST_x are detected and cleared.
 */
static int prcm_clear_mod_irqs(s16 module, u8 regs)
{
        u32 wkst, fclk, iclk, clken;
        u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
        u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
        u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
        u16 grpsel_off = (regs == 3) ?
                OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
        int c = 0;

        wkst = prm_read_mod_reg(module, wkst_off);
        wkst &= prm_read_mod_reg(module, grpsel_off);
        if (wkst) {
                iclk = cm_read_mod_reg(module, iclk_off);
                fclk = cm_read_mod_reg(module, fclk_off);
                while (wkst) {
                        clken = wkst;
                        cm_set_mod_reg_bits(clken, module, iclk_off);
                        /*
                         * For USBHOST, we don't know whether HOST1 or
                         * HOST2 woke us up, so enable both f-clocks
                         */
                        if (module == OMAP3430ES2_USBHOST_MOD)
                                clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
                        cm_set_mod_reg_bits(clken, module, fclk_off);
                        prm_write_mod_reg(wkst, module, wkst_off);
                        wkst = prm_read_mod_reg(module, wkst_off);
                        c++;
                }
                cm_write_mod_reg(iclk, module, iclk_off);
                cm_write_mod_reg(fclk, module, fclk_off);
        }

        return c;
}

static int _prcm_int_handle_wakeup(void)
{
        int c;

        c = prcm_clear_mod_irqs(WKUP_MOD, 1);
        c += prcm_clear_mod_irqs(CORE_MOD, 1);
        c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1);
        if (omap_rev() > OMAP3430_REV_ES1_0) {
                c += prcm_clear_mod_irqs(CORE_MOD, 3);
                c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1);
        }

        return c;
}

/*
 * PRCM Interrupt Handler
 *
 * The PRM_IRQSTATUS_MPU register indicates if there are any pending
 * interrupts from the PRCM for the MPU. These bits must be cleared in
 * order to clear the PRCM interrupt. The PRCM interrupt handler is
 * implemented to simply clear the PRM_IRQSTATUS_MPU in order to clear
 * the PRCM interrupt. Please note that bit 0 of the PRM_IRQSTATUS_MPU
 * register indicates that a wake-up event is pending for the MPU and
 * this bit can only be cleared if the all the wake-up events latched
 * in the various PM_WKST_x registers have been cleared. The interrupt
 * handler is implemented using a do-while loop so that if a wake-up
 * event occurred during the processing of the prcm interrupt handler
 * (setting a bit in the corresponding PM_WKST_x register and thus
 * preventing us from clearing bit 0 of the PRM_IRQSTATUS_MPU register)
 * this would be handled.
 */
static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
{
        u32 irqstatus_mpu;
        int c = 0;

        do {
                irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
                                        OMAP3_PRM_IRQSTATUS_MPU_OFFSET);

                if (irqstatus_mpu & (OMAP3430_WKUP_ST | OMAP3430_IO_ST)) {
                        c = _prcm_int_handle_wakeup();

                        /*
                         * Is the MPU PRCM interrupt handler racing with the
                         * IVA2 PRCM interrupt handler ?
                         */
                        WARN(c == 0, "prcm: WARNING: PRCM indicated MPU wakeup "
                             "but no wakeup sources are marked\n");
                } else {
                        /* XXX we need to expand our PRCM interrupt handler */
                        WARN(1, "prcm: WARNING: PRCM interrupt received, but "
                             "no code to handle it (%08x)\n", irqstatus_mpu);
                }

                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));

        return IRQ_HANDLED;
}

static void restore_control_register(u32 val)
{
        __asm__ __volatile__ ("mcr p15, 0, %0, c1, c0, 0" : : "r" (val));
}

/* Function to restore the table entry that was modified for enabling MMU */
static void restore_table_entry(void)
{
        u32 *scratchpad_address;
        u32 previous_value, control_reg_value;
        u32 *address;

        scratchpad_address = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD);

        /* Get address of entry that was modified */
        address = (u32 *)__raw_readl(scratchpad_address +
                                     OMAP343X_TABLE_ADDRESS_OFFSET);
        /* Get the previous value which needs to be restored */
        previous_value = __raw_readl(scratchpad_address +
                                     OMAP343X_TABLE_VALUE_OFFSET);
        address = __va(address);
        *address = previous_value;
        flush_tlb_all();
        control_reg_value = __raw_readl(scratchpad_address
                                        + OMAP343X_CONTROL_REG_VALUE_OFFSET);
        /* This will enable caches and prediction */
        restore_control_register(control_reg_value);
}

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;
        int mpu_next_state = PWRDM_POWER_ON;
        int per_next_state = PWRDM_POWER_ON;
        int core_next_state = PWRDM_POWER_ON;
        int core_prev_state, per_prev_state;
        u32 sdrc_pwr = 0;
        int per_state_modified = 0;

        if (!_omap_sram_idle)
                return;

        pwrdm_clear_all_prev_pwrst(mpu_pwrdm);
        pwrdm_clear_all_prev_pwrst(neon_pwrdm);
        pwrdm_clear_all_prev_pwrst(core_pwrdm);
        pwrdm_clear_all_prev_pwrst(per_pwrdm);

        mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
        switch (mpu_next_state) {
        case PWRDM_POWER_ON:
        case PWRDM_POWER_RET:
                /* No need to save context */
                save_state = 0;
                break;
        case PWRDM_POWER_OFF:
                save_state = 3;
                break;
        default:
                /* Invalid state */
                printk(KERN_ERR "Invalid mpu state in sram_idle\n");
                return;
        }

        /* Disable smartreflex before entering WFI */
        disable_smartreflex(SR1);
        disable_smartreflex(SR2);

        pwrdm_pre_transition();

        /* NEON control */
        if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
                pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);

        /* PER */
        per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
        core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
        if (per_next_state < PWRDM_POWER_ON) {
                omap_uart_prepare_idle(2);
                omap2_gpio_prepare_for_idle(per_next_state);
                if (per_next_state == PWRDM_POWER_OFF) {
                        if (core_next_state == PWRDM_POWER_ON) {
                                per_next_state = PWRDM_POWER_RET;
                                pwrdm_set_next_pwrst(per_pwrdm, per_next_state);
                                per_state_modified = 1;
                        } else
                                omap3_per_save_context();
                }
        }

        if (pwrdm_read_pwrst(cam_pwrdm) == PWRDM_POWER_ON)
                omap2_clkdm_deny_idle(mpu_pwrdm->pwrdm_clkdms[0]);

        /* CORE */
        if (core_next_state < PWRDM_POWER_ON) {
                omap_uart_prepare_idle(0);
                omap_uart_prepare_idle(1);
                if (core_next_state == PWRDM_POWER_OFF) {
                        omap3_core_save_context();
                        omap3_prcm_save_context();
                }
                /* Enable IO-PAD and IO-CHAIN wakeups */
                prm_set_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
                omap3_enable_io_chain();
        }

        /*
        * On EMU/HS devices ROM code restores a SRDC value
        * from scratchpad which has automatic self refresh on timeout
        * of AUTO_CNT = 1 enabled. This takes care of errata 1.142.
        * Hence store/restore the SDRC_POWER register here.
        */
        if (omap_rev() >= OMAP3430_REV_ES3_0 &&
            omap_type() != OMAP2_DEVICE_TYPE_GP &&
            core_next_state == PWRDM_POWER_OFF)
                sdrc_pwr = sdrc_read_reg(SDRC_POWER);

        /*
         * omap3_arm_context is the location where ARM registers
         * get saved. The restore path then reads from this
         * location and restores them back.
         */
        _omap_sram_idle(omap3_arm_context, save_state);
        cpu_init();

        /* Restore normal SDRC POWER settings */
        if (omap_rev() >= OMAP3430_REV_ES3_0 &&
            omap_type() != OMAP2_DEVICE_TYPE_GP &&
            core_next_state == PWRDM_POWER_OFF)
                sdrc_write_reg(sdrc_pwr, SDRC_POWER);

        /* Restore table entry modified during MMU restoration */
        if (pwrdm_read_prev_pwrst(mpu_pwrdm) == PWRDM_POWER_OFF)
                restore_table_entry();

        /* CORE */
        if (core_next_state < PWRDM_POWER_ON) {
                core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm);
                if (core_prev_state == PWRDM_POWER_OFF) {
                        omap3_core_restore_context();
                        omap3_prcm_restore_context();
                        omap3_sram_restore_context();
                        omap2_sms_restore_context();
                }
                omap_uart_resume_idle(0);
                omap_uart_resume_idle(1);
                if (core_next_state == PWRDM_POWER_OFF)
                        prm_clear_mod_reg_bits(OMAP3430_AUTO_OFF,
                                               OMAP3430_GR_MOD,
                                               OMAP3_PRM_VOLTCTRL_OFFSET);
        }

        /* PER */
        if (per_next_state < PWRDM_POWER_ON) {
                per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm);
                if (per_prev_state == PWRDM_POWER_OFF) {
                        omap3_per_restore_context();
                        omap3_gpio_restore_pad_context(0);
                } else if (per_next_state == PWRDM_POWER_OFF)
                        omap3_gpio_restore_pad_context(1);
                omap2_gpio_resume_after_idle();
                omap_uart_resume_idle(2);
                if (per_state_modified)
                        pwrdm_set_next_pwrst(per_pwrdm, PWRDM_POWER_OFF);
        }

        /* Disable IO-PAD and IO-CHAIN wakeup */
        if (core_next_state < PWRDM_POWER_ON) {
                prm_clear_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
                omap3_disable_io_chain();
        }

        /* Enable smartreflex after WFI */
        enable_smartreflex(SR1);
        enable_smartreflex(SR2);

        pwrdm_post_transition();

        omap2_clkdm_allow_idle(mpu_pwrdm->pwrdm_clkdms[0]);
}

int omap3_can_sleep(void)
{
        if (!sleep_while_idle)
                return 0;
        if (!omap_uart_can_sleep())
                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. */
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);
                pwrdm_state_switch(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() || need_resched())
                goto out;

        omap_sram_idle();

out:
        local_fiq_enable();
        local_irq_enable();
}

#ifdef CONFIG_SUSPEND
static suspend_state_t suspend_state;

static void omap2_pm_wakeup_on_timer(u32 seconds)
{
        u32 tick_rate, cycles;

        if (!seconds)
                return;

        tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer_wakeup));
        cycles = tick_rate * seconds;
        omap_dm_timer_stop(gptimer_wakeup);
        omap_dm_timer_set_load_start(gptimer_wakeup, 0, 0xffffffff - cycles);

        pr_info("PM: Resume timer in %d secs (%d ticks at %d ticks/sec.)\n",
                seconds, cycles, tick_rate);
}

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

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

        if (wakeup_timer_seconds)
                omap2_pm_wakeup_on_timer(wakeup_timer_seconds);

        /* 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_uart_prepare_suspend();
        omap_sram_idle();

restore:
        /* Restore next_pwrsts */
        list_for_each_entry(pwrst, &pwrst_list, node) {
                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;
                }
                set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
        }
        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 unused)
{
        int ret = 0;

        switch (suspend_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();
}

/* Hooks to enable / disable UART interrupts during suspend */
static int omap3_pm_begin(suspend_state_t state)
{
        suspend_state = state;
        omap_uart_enable_irqs(0);
        return 0;
}

static void omap3_pm_end(void)
{
        suspend_state = PM_SUSPEND_ON;
        omap_uart_enable_irqs(1);
        return;
}

static struct platform_suspend_ops omap_pm_ops = {
        .begin          = omap3_pm_begin,
        .end            = omap3_pm_end,
        .prepare        = omap3_pm_prepare,
        .enter          = omap3_pm_enter,
        .finish         = omap3_pm_finish,
        .valid          = suspend_valid_only_mem,
};
#endif /* CONFIG_SUSPEND */


/**
 * omap3_iva_idle(): ensure IVA is in idle so it can be put into
 *                   retention
 *
 * In cases where IVA2 is activated by bootcode, it may prevent
 * full-chip retention or off-mode because it is not idle.  This
 * function forces the IVA2 into idle state so it can go
 * into retention/off and thus allow full-chip retention/off.
 *
 **/
static void __init omap3_iva_idle(void)
{
        /* ensure IVA2 clock is disabled */
        cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);

        /* if no clock activity, nothing else to do */
        if (!(cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
              OMAP3430_CLKACTIVITY_IVA2_MASK))
                return;

        /* Reset IVA2 */
        prm_write_mod_reg(OMAP3430_RST1_IVA2 |
                          OMAP3430_RST2_IVA2 |
                          OMAP3430_RST3_IVA2,
                          OMAP3430_IVA2_MOD, RM_RSTCTRL);

        /* Enable IVA2 clock */
        cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2,
                         OMAP3430_IVA2_MOD, CM_FCLKEN);

        /* Set IVA2 boot mode to 'idle' */
        omap_ctrl_writel(OMAP3_IVA2_BOOTMOD_IDLE,
                         OMAP343X_CONTROL_IVA2_BOOTMOD);

        /* Un-reset IVA2 */
        prm_write_mod_reg(0, OMAP3430_IVA2_MOD, RM_RSTCTRL);

        /* Disable IVA2 clock */
        cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);

        /* Reset IVA2 */
        prm_write_mod_reg(OMAP3430_RST1_IVA2 |
                          OMAP3430_RST2_IVA2 |
                          OMAP3430_RST3_IVA2,
                          OMAP3430_IVA2_MOD, RM_RSTCTRL);
}

static void __init omap3_d2d_idle(void)
{
        u16 mask, padconf;

        /* In a stand alone OMAP3430 where there is not a stacked
         * modem for the D2D Idle Ack and D2D MStandby must be pulled
         * high. S CONTROL_PADCONF_SAD2D_IDLEACK and
         * CONTROL_PADCONF_SAD2D_MSTDBY to have a pull up. */
        mask = (1 << 4) | (1 << 3); /* pull-up, enabled */
        padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_MSTANDBY);
        padconf |= mask;
        omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_MSTANDBY);

        padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_IDLEACK);
        padconf |= mask;
        omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK);

        /* 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);
}

static void __init prcm_setup_regs(void)
{
        /* 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(
                OMAP3430_AUTO_MODEM |
                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 |
                OMAP3430_AUTO_SAD2D |
                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(
                        OMAP3430_AUTO_MAD2D |
                        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);

        /* Enable wakeups in PER */
        prm_write_mod_reg(OMAP3430_EN_GPIO2 | OMAP3430_EN_GPIO3 |
                          OMAP3430_EN_GPIO4 | OMAP3430_EN_GPIO5 |
                          OMAP3430_EN_GPIO6 | OMAP3430_EN_UART3,
                          OMAP3430_PER_MOD, PM_WKEN);
        /* and allow them to wake up MPU */
        prm_write_mod_reg(OMAP3430_GRPSEL_GPIO2 | OMAP3430_EN_GPIO3 |
                          OMAP3430_GRPSEL_GPIO4 | OMAP3430_EN_GPIO5 |
                          OMAP3430_GRPSEL_GPIO6 | OMAP3430_EN_UART3,
                          OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);

        /* Don't attach IVA interrupts */
        prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
        prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
        prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
        prm_write_mod_reg(0, OMAP3430_PER_MOD, OMAP3430_PM_IVAGRPSEL);

        /* Clear any pending 'reset' flags */
        prm_write_mod_reg(0xffffffff, MPU_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, CORE_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, RM_RSTST);

        /* Clear any pending PRCM interrupts */
        prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);

        /* Don't attach IVA interrupts */
        prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
        prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
        prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
        prm_write_mod_reg(0, OMAP3430_PER_MOD, OMAP3430_PM_IVAGRPSEL);

        /* Clear any pending 'reset' flags */
        prm_write_mod_reg(0xffffffff, MPU_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, CORE_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, RM_RSTST);
        prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, RM_RSTST);

        /* Clear any pending PRCM interrupts */
        prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);

        omap3_iva_idle();
        omap3_d2d_idle();
}

void omap3_pm_off_mode_enable(int enable)
{
        struct power_state *pwrst;
        u32 state;

        if (enable)
                state = PWRDM_POWER_OFF;
        else
                state = PWRDM_POWER_RET;

        list_for_each_entry(pwrst, &pwrst_list, node) {
                pwrst->next_state = state;
                set_pwrdm_state(pwrst->pwrdm, state);
        }
}

int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
{
        struct power_state *pwrst;

        list_for_each_entry(pwrst, &pwrst_list, node) {
                if (pwrst->pwrdm == pwrdm)
                        return pwrst->next_state;
        }
        return -EINVAL;
}

int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
{
        struct power_state *pwrst;

        list_for_each_entry(pwrst, &pwrst_list, node) {
                if (pwrst->pwrdm == pwrdm) {
                        pwrst->next_state = state;
                        return 0;
                }
        }
        return -EINVAL;
}

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

        if (!pwrdm->pwrsts)
                return 0;

        pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
        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, void *unused)
{
        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;
}

void omap_push_sram_idle(void)
{
        _omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend,
                                        omap34xx_cpu_suspend_sz);
        if (omap_type() != OMAP2_DEVICE_TYPE_GP)
                _omap_save_secure_sram = omap_sram_push(save_secure_ram_context,
                                save_secure_ram_context_sz);
}

static 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, NULL);
        if (ret) {
                printk(KERN_ERR "Failed to setup powerdomains\n");
                goto err2;
        }

        (void) clkdm_for_each(clkdms_setup, NULL);

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

        neon_pwrdm = pwrdm_lookup("neon_pwrdm");
        per_pwrdm = pwrdm_lookup("per_pwrdm");
        core_pwrdm = pwrdm_lookup("core_pwrdm");
        cam_pwrdm = pwrdm_lookup("cam_pwrdm");

        omap_push_sram_idle();
#ifdef CONFIG_SUSPEND
        suspend_set_ops(&omap_pm_ops);
#endif /* CONFIG_SUSPEND */

        pm_idle = omap3_pm_idle;
        omap3_idle_init();

        pwrdm_add_wkdep(neon_pwrdm, mpu_pwrdm);
        /*
         * REVISIT: This wkdep is only necessary when GPIO2-6 are enabled for
         * IO-pad wakeup.  Otherwise it will unnecessarily waste power
         * waking up PER with every CORE wakeup - see
         * http://marc.info/?l=linux-omap&m=121852150710062&w=2
        */
        pwrdm_add_wkdep(per_pwrdm, core_pwrdm);

        if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
                omap3_secure_ram_storage =
                        kmalloc(0x803F, GFP_KERNEL);
                if (!omap3_secure_ram_storage)
                        printk(KERN_ERR "Memory allocation failed when"
                                        "allocating for secure sram context\n");

                local_irq_disable();
                local_fiq_disable();

                omap_dma_global_context_save();
                omap3_save_secure_ram_context(PWRDM_POWER_ON);
                omap_dma_global_context_restore();

                local_irq_enable();
                local_fiq_enable();
        }

        omap3_save_scratchpad_contents();
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;
}

/* PRM_VC_CMD_VAL_0 specific bits */
#define OMAP3430_VC_CMD_VAL0_ON                         (0x3 << 4)
#define OMAP3430_VC_CMD_VAL0_ONLP                       (0x3 << 3)
#define OMAP3430_VC_CMD_VAL0_RET                        (0x3 << 3)
#define OMAP3430_VC_CMD_VAL0_OFF                        (0x3 << 3)

/* PRM_VC_CMD_VAL_1 specific bits */
#define OMAP3430_VC_CMD_VAL1_ON                         (0xB << 2)
#define OMAP3430_VC_CMD_VAL1_ONLP                       (0x3 << 3)
#define OMAP3430_VC_CMD_VAL1_RET                        (0x3 << 3)
#define OMAP3430_VC_CMD_VAL1_OFF                        (0x3 << 3)

/* Constants to define setup durations */
#define OMAP3430_CLKSETUP_DURATION                      0xff
#define OMAP3430_VOLTSETUP_TIME2                        0xfff
#define OMAP3430_VOLTSETUP_TIME1                        0xfff
#define OMAP3430_VOLTOFFSET_DURATION                    0xff
#define OMAP3430_VOLTSETUP2_DURATION                    0xff

static void __init configure_vc(void)
{
        prm_write_mod_reg((R_SRI2C_SLAVE_ADDR << OMAP3430_SMPS_SA1_SHIFT) |
                          (R_SRI2C_SLAVE_ADDR << OMAP3430_SMPS_SA0_SHIFT),
                          OMAP3430_GR_MOD, OMAP3_PRM_VC_SMPS_SA_OFFSET);
        prm_write_mod_reg((R_VDD2_SR_CONTROL << OMAP3430_VOLRA1_SHIFT) |
                          (R_VDD1_SR_CONTROL << OMAP3430_VOLRA0_SHIFT),
                          OMAP3430_GR_MOD, OMAP3_PRM_VC_SMPS_VOL_RA_OFFSET);

        prm_write_mod_reg(
                (OMAP3430_VC_CMD_VAL0_ON << OMAP3430_VC_CMD_ON_SHIFT) |
                (OMAP3430_VC_CMD_VAL0_ONLP << OMAP3430_VC_CMD_ONLP_SHIFT) |
                (OMAP3430_VC_CMD_VAL0_RET << OMAP3430_VC_CMD_RET_SHIFT) |
                (OMAP3430_VC_CMD_VAL0_OFF << OMAP3430_VC_CMD_OFF_SHIFT),
                OMAP3430_GR_MOD, OMAP3_PRM_VC_CMD_VAL_0_OFFSET);

        prm_write_mod_reg(
                (OMAP3430_VC_CMD_VAL1_ON << OMAP3430_VC_CMD_ON_SHIFT) |
                (OMAP3430_VC_CMD_VAL1_ONLP << OMAP3430_VC_CMD_ONLP_SHIFT) |
                (OMAP3430_VC_CMD_VAL1_RET << OMAP3430_VC_CMD_RET_SHIFT) |
                (OMAP3430_VC_CMD_VAL1_OFF << OMAP3430_VC_CMD_OFF_SHIFT),
                OMAP3430_GR_MOD, OMAP3_PRM_VC_CMD_VAL_1_OFFSET);

        prm_write_mod_reg(OMAP3430_CMD1 | OMAP3430_RAV1, OMAP3430_GR_MOD,
                          OMAP3_PRM_VC_CH_CONF_OFFSET);

        prm_write_mod_reg(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN | OMAP3430_SREN,
                          OMAP3430_GR_MOD,
                          OMAP3_PRM_VC_I2C_CFG_OFFSET);

        /* Setup voltctrl and other setup times */
        prm_write_mod_reg(OMAP3430_AUTO_RET, OMAP3430_GR_MOD,
                          OMAP3_PRM_VOLTCTRL_OFFSET);

        prm_write_mod_reg(OMAP3430_CLKSETUP_DURATION, OMAP3430_GR_MOD,
                          OMAP3_PRM_CLKSETUP_OFFSET);
        prm_write_mod_reg(
                (OMAP3430_VOLTSETUP_TIME2 << OMAP3430_SETUP_TIME2_SHIFT) |
                (OMAP3430_VOLTSETUP_TIME1 << OMAP3430_SETUP_TIME1_SHIFT),
                OMAP3430_GR_MOD, OMAP3_PRM_VOLTSETUP1_OFFSET);

        prm_write_mod_reg(OMAP3430_VOLTOFFSET_DURATION, OMAP3430_GR_MOD,
                        OMAP3_PRM_VOLTOFFSET_OFFSET);
        prm_write_mod_reg(OMAP3430_VOLTSETUP2_DURATION, OMAP3430_GR_MOD,
                        OMAP3_PRM_VOLTSETUP2_OFFSET);
}

static int __init omap3_pm_early_init(void)
{
        prm_clear_mod_reg_bits(OMAP3430_OFFMODE_POL, OMAP3430_GR_MOD,
                                OMAP3_PRM_POLCTRL_OFFSET);

        configure_vc();

        return 0;
}

arch_initcall(omap3_pm_early_init);
late_initcall(omap3_pm_init);