1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2019 Stephan Gerhold <stephan@gerhold.net>
10 #include <asm/pl310.h>
12 #define PL310_WAY_MASK 0xff
14 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
15 void enable_caches(void)
17 /* Enable D-cache. I-cache is already enabled in start.S */
22 #ifdef CONFIG_SYS_L2_PL310
23 void v7_outer_cache_disable(void)
25 struct pl310_regs *const pl310 = (struct pl310_regs *)CONFIG_SYS_PL310_BASE;
28 * Linux expects the L2 cache to be turned off by the bootloader.
29 * Otherwise, it fails very early (shortly after decompressing the kernel).
31 * On U8500, the L2 cache can be only turned on/off from the secure world.
32 * Instead, prevent usage of the L2 cache by locking all ways.
33 * The kernel needs to unlock them to make the L2 cache work again.
35 writel(PL310_WAY_MASK, &pl310->pl310_lockdown_dbase);
36 writel(PL310_WAY_MASK, &pl310->pl310_lockdown_ibase);