1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2019 Stephan Gerhold <stephan@gerhold.net>
4  */
5 
6 #include <common.h>
7 #include <cpu_func.h>
8 #include <asm/armv7.h>
9 #include <asm/cache.h>
10 #include <asm/pl310.h>
11 
12 #define PL310_WAY_MASK	0xff
13 
14 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
enable_caches(void)15 void enable_caches(void)
16 {
17 	/* Enable D-cache. I-cache is already enabled in start.S */
18 	dcache_enable();
19 }
20 #endif
21 
22 #ifdef CONFIG_SYS_L2_PL310
v7_outer_cache_disable(void)23 void v7_outer_cache_disable(void)
24 {
25 	struct pl310_regs *const pl310 = (struct pl310_regs *)CONFIG_SYS_PL310_BASE;
26 
27 	/*
28 	 * Linux expects the L2 cache to be turned off by the bootloader.
29 	 * Otherwise, it fails very early (shortly after decompressing the kernel).
30 	 *
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.
34 	 */
35 	writel(PL310_WAY_MASK, &pl310->pl310_lockdown_dbase);
36 	writel(PL310_WAY_MASK, &pl310->pl310_lockdown_ibase);
37 }
38 #endif
39