FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/imx/imx6_pl310.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2012 Olivier Houchard.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*
     * The machine-dependent part of the arm/pl310 driver for imx6 SoCs.
     */
    
    #include <sys/types.h>
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/rman.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    
    #include <machine/bus.h>
    #include <machine/pl310.h>
    #include <machine/platformvar.h>
    
    #include <arm/freescale/imx/imx6_machdep.h>
    
    #include "platform_pl310_if.h"
    
    void
    imx6_pl310_init(platform_t plat, struct pl310_softc *sc)
    {
            uint32_t reg;
    
            /*
             * Enable power saving modes:
             *  - Dynamic Gating stops the clock when the controller is idle.
             *  - Standby stops the clock when the cores are in WFI mode.
             */
            reg = pl310_read4(sc, PL310_POWER_CTRL);
            reg |= POWER_CTRL_ENABLE_GATING | POWER_CTRL_ENABLE_STANDBY;
            pl310_write4(sc, PL310_POWER_CTRL, reg);
    
            pl310_set_ram_latency(sc, PL310_TAG_RAM_CTRL,  4, 2, 3);
            pl310_set_ram_latency(sc, PL310_DATA_RAM_CTRL, 4, 2, 3);
    }

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