The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2012 Olivier Houchard.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/11.0/sys/arm/freescale/imx/imx6_pl310.c 265447 2014-05-06 14:26:24Z ian $");
   28 
   29 /*
   30  * The machine-dependent part of the arm/pl310 driver for imx6 SoCs.
   31  */
   32 
   33 #include <sys/types.h>
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/rman.h>
   38 #include <sys/lock.h>
   39 #include <sys/mutex.h>
   40 
   41 #include <machine/bus.h>
   42 #include <machine/pl310.h>
   43 
   44 void
   45 platform_pl310_init(struct pl310_softc *sc)
   46 {
   47         uint32_t reg;
   48 
   49         /*
   50          * Enable power saving modes:
   51          *  - Dynamic Gating stops the clock when the controller is idle.
   52          *  - Standby stops the clock when the cores are in WFI mode.
   53          */
   54         reg = pl310_read4(sc, PL310_POWER_CTRL);
   55         reg |= POWER_CTRL_ENABLE_GATING | POWER_CTRL_ENABLE_STANDBY;
   56         pl310_write4(sc, PL310_POWER_CTRL, reg);
   57 
   58         pl310_set_ram_latency(sc, PL310_TAG_RAM_CTRL,  4, 2, 3);
   59         pl310_set_ram_latency(sc, PL310_DATA_RAM_CTRL, 4, 2, 3);
   60 }
   61 
   62 void
   63 platform_pl310_write_ctrl(struct pl310_softc *sc, uint32_t val)
   64 {
   65 
   66         pl310_write4(sc, PL310_CTRL, val);
   67 }
   68 
   69 void
   70 platform_pl310_write_debug(struct pl310_softc *sc, uint32_t val)
   71 {
   72 
   73         pl310_write4(sc, PL310_DEBUG_CTRL, val);
   74 }
   75 

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