diff options
Diffstat (limited to 'arch/arm/include/asm/cachetype.h')
-rw-r--r-- | arch/arm/include/asm/cachetype.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/arm/include/asm/cachetype.h b/arch/arm/include/asm/cachetype.h new file mode 100644 index 0000000000..e8c30430be --- /dev/null +++ b/arch/arm/include/asm/cachetype.h @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_ARM_CACHETYPE_H +#define __ASM_ARM_CACHETYPE_H + +#define CACHEID_VIVT (1 << 0) +#define CACHEID_VIPT_NONALIASING (1 << 1) +#define CACHEID_VIPT_ALIASING (1 << 2) +#define CACHEID_VIPT (CACHEID_VIPT_ALIASING|CACHEID_VIPT_NONALIASING) +#define CACHEID_ASID_TAGGED (1 << 3) +#define CACHEID_VIPT_I_ALIASING (1 << 4) +#define CACHEID_PIPT (1 << 5) + +extern unsigned int cacheid; + +#define cache_is_vivt() cacheid_is(CACHEID_VIVT) +#define cache_is_vipt() cacheid_is(CACHEID_VIPT) +#define cache_is_vipt_nonaliasing() cacheid_is(CACHEID_VIPT_NONALIASING) +#define cache_is_vipt_aliasing() cacheid_is(CACHEID_VIPT_ALIASING) +#define icache_is_vivt_asid_tagged() cacheid_is(CACHEID_ASID_TAGGED) +#define icache_is_vipt_aliasing() cacheid_is(CACHEID_VIPT_I_ALIASING) +#define icache_is_pipt() cacheid_is(CACHEID_PIPT) + +/* + * __LINUX_ARM_ARCH__ is the minimum supported CPU architecture + * Mask out support which will never be present on newer CPUs. + * - v6+ is never VIVT + * - v7+ VIPT never aliases on D-side + */ +#if __LINUX_ARM_ARCH__ >= 7 +#define __CACHEID_ARCH_MIN (CACHEID_VIPT_NONALIASING |\ + CACHEID_ASID_TAGGED |\ + CACHEID_VIPT_I_ALIASING |\ + CACHEID_PIPT) +#elif __LINUX_ARM_ARCH__ >= 6 +#define __CACHEID_ARCH_MIN (~CACHEID_VIVT) +#else +#define __CACHEID_ARCH_MIN (~0) +#endif + +/* + * Mask out support which isn't configured + */ +#if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT) +#define __CACHEID_ALWAYS (CACHEID_VIVT) +#define __CACHEID_NEVER (~CACHEID_VIVT) +#elif !defined(CONFIG_CPU_CACHE_VIVT) && defined(CONFIG_CPU_CACHE_VIPT) +#define __CACHEID_ALWAYS (0) +#define __CACHEID_NEVER (CACHEID_VIVT) +#else +#define __CACHEID_ALWAYS (0) +#define __CACHEID_NEVER (0) +#endif + +static inline unsigned int __attribute__((pure)) cacheid_is(unsigned int mask) +{ + return (__CACHEID_ALWAYS & mask) | + (~__CACHEID_NEVER & __CACHEID_ARCH_MIN & mask & cacheid); +} + +#define CSSELR_ICACHE 1 +#define CSSELR_DCACHE 0 + +#define CSSELR_L1 (0 << 1) +#define CSSELR_L2 (1 << 1) +#define CSSELR_L3 (2 << 1) +#define CSSELR_L4 (3 << 1) +#define CSSELR_L5 (4 << 1) +#define CSSELR_L6 (5 << 1) +#define CSSELR_L7 (6 << 1) + +#ifndef CONFIG_CPU_V7M +static inline void set_csselr(unsigned int cache_selector) +{ + asm volatile("mcr p15, 2, %0, c0, c0, 0" : : "r" (cache_selector)); +} + +static inline unsigned int read_ccsidr(void) +{ + unsigned int val; + + asm volatile("mrc p15, 1, %0, c0, c0, 0" : "=r" (val)); + return val; +} +#else /* CONFIG_CPU_V7M */ +#include <linux/io.h> +#include "asm/v7m.h" + +static inline void set_csselr(unsigned int cache_selector) +{ + writel(cache_selector, BASEADDR_V7M_SCB + V7M_SCB_CTR); +} + +static inline unsigned int read_ccsidr(void) +{ + return readl(BASEADDR_V7M_SCB + V7M_SCB_CCSIDR); +} +#endif + +#endif |