1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Olivier Houchard. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 /* 32 * The machine-dependent part of the arm/pl310 driver for imx6 SoCs. 33 */ 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/rman.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 43 #include <machine/bus.h> 44 #include <machine/pl310.h> 45 #include <machine/platformvar.h> 46 47 #include <arm/freescale/imx/imx6_machdep.h> 48 49 #include "platform_pl310_if.h" 50 51 void 52 imx6_pl310_init(platform_t plat, struct pl310_softc *sc) 53 { 54 uint32_t reg; 55 56 /* 57 * Enable power saving modes: 58 * - Dynamic Gating stops the clock when the controller is idle. 59 * - Standby stops the clock when the cores are in WFI mode. 60 */ 61 reg = pl310_read4(sc, PL310_POWER_CTRL); 62 reg |= POWER_CTRL_ENABLE_GATING | POWER_CTRL_ENABLE_STANDBY; 63 pl310_write4(sc, PL310_POWER_CTRL, reg); 64 65 pl310_set_ram_latency(sc, PL310_TAG_RAM_CTRL, 4, 2, 3); 66 pl310_set_ram_latency(sc, PL310_DATA_RAM_CTRL, 4, 2, 3); 67 } 68