1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 /*
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 #include <machine/platformvar.h>
44
45 #include <arm/freescale/imx/imx6_machdep.h>
46
47 #include "platform_pl310_if.h"
48
49 void
imx6_pl310_init(platform_t plat,struct pl310_softc * sc)50 imx6_pl310_init(platform_t plat, struct pl310_softc *sc)
51 {
52 uint32_t reg;
53
54 /*
55 * Enable power saving modes:
56 * - Dynamic Gating stops the clock when the controller is idle.
57 * - Standby stops the clock when the cores are in WFI mode.
58 */
59 reg = pl310_read4(sc, PL310_POWER_CTRL);
60 reg |= POWER_CTRL_ENABLE_GATING | POWER_CTRL_ENABLE_STANDBY;
61 pl310_write4(sc, PL310_POWER_CTRL, reg);
62
63 pl310_set_ram_latency(sc, PL310_TAG_RAM_CTRL, 4, 2, 3);
64 pl310_set_ram_latency(sc, PL310_DATA_RAM_CTRL, 4, 2, 3);
65 }
66