u-boot/arch/arm/mach-tegra/cache.c
Tom Warren 7aaa5a60ce ARM: Tegra210: Add support to common Tegra source/config files
Derived from Tegra124, modified as appropriate during T210
board bringup. Cleaned up debug statements to conserve
string space, too. This also adds misc 64-bit changes
from Thierry Reding/Stephen Warren.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
2015-07-28 10:30:20 -07:00

48 lines
1.4 KiB
C

/*
* Copyright (c) 2013-2014, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Tegra cache routines */
#include <common.h>
#include <asm/io.h>
#include <asm/arch-tegra/ap.h>
#include <asm/arch/gp_padctrl.h>
#ifndef CONFIG_ARM64
void config_cache(void)
{
u32 reg = 0;
/* enable SMP mode and FW for CPU0, by writing to Auxiliary Ctl reg */
asm volatile(
"mrc p15, 0, r0, c1, c0, 1\n"
"orr r0, r0, #0x41\n"
"mcr p15, 0, r0, c1, c0, 1\n");
/* Currently, only Tegra114+ needs this L2 cache change to boot Linux */
if (tegra_get_chip() < CHIPID_TEGRA114)
return;
/*
* Systems with an architectural L2 cache must not use the PL310.
* Config L2CTLR here for a data RAM latency of 3 cycles.
*/
asm("mrc p15, 1, %0, c9, c0, 2" : : "r" (reg));
reg &= ~7;
reg |= 2;
asm("mcr p15, 1, %0, c9, c0, 2" : : "r" (reg));
}
#endif