diff options
Diffstat (limited to 'arch/arm/mach-u8500/cache.c')
| -rw-r--r-- | arch/arm/mach-u8500/cache.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm/mach-u8500/cache.c b/arch/arm/mach-u8500/cache.c new file mode 100644 index 0000000000..3d96d09f31 --- /dev/null +++ b/arch/arm/mach-u8500/cache.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2019 Stephan Gerhold <stephan@gerhold.net> + */ + +#include <common.h> +#include <cpu_func.h> +#include <asm/armv7.h> +#include <asm/pl310.h> + +#define PL310_WAY_MASK 0xff + +#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) +void enable_caches(void) +{ + /* Enable D-cache. I-cache is already enabled in start.S */ + dcache_enable(); +} +#endif + +#ifdef CONFIG_SYS_L2_PL310 +void v7_outer_cache_disable(void) +{ + struct pl310_regs *const pl310 = (struct pl310_regs *)CONFIG_SYS_PL310_BASE; + + /* + * Linux expects the L2 cache to be turned off by the bootloader. + * Otherwise, it fails very early (shortly after decompressing the kernel). + * + * On U8500, the L2 cache can be only turned on/off from the secure world. + * Instead, prevent usage of the L2 cache by locking all ways. + * The kernel needs to unlock them to make the L2 cache work again. + */ + writel(PL310_WAY_MASK, &pl310->pl310_lockdown_dbase); + writel(PL310_WAY_MASK, &pl310->pl310_lockdown_ibase); +} +#endif |