clockdomain44xx.c

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/*
 * OMAP4 clockdomain control
 *
 * Copyright (C) 2008-2010 Texas Instruments, Inc.
 * Copyright (C) 2008-2010 Nokia Corporation
 *
 * Derived from mach-omap2/clockdomain.c written by Paul Walmsley
 * Rajendra Nayak <[email protected]>
 *
 * 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 "clockdomain.h"
#include "cminst44xx.h"
#include "cm44xx.h"

static int omap4_clkdm_add_wkup_sleep_dep(struct clockdomain *clkdm1,
                    struct clockdomain *clkdm2)
{
    omap4_cminst_set_inst_reg_bits((1 << clkdm2->dep_bit),
                    clkdm1->prcm_partition,
                    clkdm1->cm_inst, clkdm1->clkdm_offs +
                    OMAP4_CM_STATICDEP);
    return 0;
}

static int omap4_clkdm_del_wkup_sleep_dep(struct clockdomain *clkdm1,
                    struct clockdomain *clkdm2)
{
    omap4_cminst_clear_inst_reg_bits((1 << clkdm2->dep_bit),
                    clkdm1->prcm_partition,
                    clkdm1->cm_inst, clkdm1->clkdm_offs +
                    OMAP4_CM_STATICDEP);
    return 0;
}

static int omap4_clkdm_read_wkup_sleep_dep(struct clockdomain *clkdm1,
                    struct clockdomain *clkdm2)
{
    return omap4_cminst_read_inst_reg_bits(clkdm1->prcm_partition,
                    clkdm1->cm_inst, clkdm1->clkdm_offs +
                    OMAP4_CM_STATICDEP,
                    (1 << clkdm2->dep_bit));
}

static int omap4_clkdm_clear_all_wkup_sleep_deps(struct clockdomain *clkdm)
{
    struct clkdm_dep *cd;
    u32 mask = 0;

    if (!clkdm->prcm_partition)
        return 0;

    for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
        if (!cd->clkdm)
            continue; /* only happens if data is erroneous */

        mask |= 1 << cd->clkdm->dep_bit;
        atomic_set(&cd->wkdep_usecount, 0);
    }

    omap4_cminst_clear_inst_reg_bits(mask, clkdm->prcm_partition,
                    clkdm->cm_inst, clkdm->clkdm_offs +
                    OMAP4_CM_STATICDEP);
    return 0;
}

static int omap4_clkdm_sleep(struct clockdomain *clkdm)
{
    omap4_cminst_clkdm_enable_hwsup(clkdm->prcm_partition,
                    clkdm->cm_inst, clkdm->clkdm_offs);
    return 0;
}

static int omap4_clkdm_wakeup(struct clockdomain *clkdm)
{
    omap4_cminst_clkdm_force_wakeup(clkdm->prcm_partition,
                    clkdm->cm_inst, clkdm->clkdm_offs);
    return 0;
}

static void omap4_clkdm_allow_idle(struct clockdomain *clkdm)
{
    omap4_cminst_clkdm_enable_hwsup(clkdm->prcm_partition,
                    clkdm->cm_inst, clkdm->clkdm_offs);
}

static void omap4_clkdm_deny_idle(struct clockdomain *clkdm)
{
    if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
        omap4_clkdm_wakeup(clkdm);
    else
        omap4_cminst_clkdm_disable_hwsup(clkdm->prcm_partition,
                         clkdm->cm_inst,
                         clkdm->clkdm_offs);
}

static int omap4_clkdm_clk_enable(struct clockdomain *clkdm)
{
    if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
        return omap4_clkdm_wakeup(clkdm);

    return 0;
}

static int omap4_clkdm_clk_disable(struct clockdomain *clkdm)
{
    bool hwsup = false;

    if (!clkdm->prcm_partition)
        return 0;

    /*
     * The CLKDM_MISSING_IDLE_REPORTING flag documentation has
     * more details on the unpleasant problem this is working
     * around
     */
    if (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING &&
        !(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) {
        omap4_clkdm_allow_idle(clkdm);
        return 0;
    }

    hwsup = omap4_cminst_is_clkdm_in_hwsup(clkdm->prcm_partition,
                    clkdm->cm_inst, clkdm->clkdm_offs);

    if (!hwsup && (clkdm->flags & CLKDM_CAN_FORCE_SLEEP))
        omap4_clkdm_sleep(clkdm);

    return 0;
}

struct clkdm_ops omap4_clkdm_operations = {
    .clkdm_add_wkdep    = omap4_clkdm_add_wkup_sleep_dep,
    .clkdm_del_wkdep    = omap4_clkdm_del_wkup_sleep_dep,
    .clkdm_read_wkdep   = omap4_clkdm_read_wkup_sleep_dep,
    .clkdm_clear_all_wkdeps = omap4_clkdm_clear_all_wkup_sleep_deps,
    .clkdm_add_sleepdep = omap4_clkdm_add_wkup_sleep_dep,
    .clkdm_del_sleepdep = omap4_clkdm_del_wkup_sleep_dep,
    .clkdm_read_sleepdep    = omap4_clkdm_read_wkup_sleep_dep,
    .clkdm_clear_all_sleepdeps  = omap4_clkdm_clear_all_wkup_sleep_deps,
    .clkdm_sleep        = omap4_clkdm_sleep,
    .clkdm_wakeup       = omap4_clkdm_wakeup,
    .clkdm_allow_idle   = omap4_clkdm_allow_idle,
    .clkdm_deny_idle    = omap4_clkdm_deny_idle,
    .clkdm_clk_enable   = omap4_clkdm_clk_enable,
    .clkdm_clk_disable  = omap4_clkdm_clk_disable,
};