diff options
Diffstat (limited to 'arch/arm/include/asm/armv7_mpu.h')
-rw-r--r-- | arch/arm/include/asm/armv7_mpu.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/arch/arm/include/asm/armv7_mpu.h b/arch/arm/include/asm/armv7_mpu.h new file mode 100644 index 0000000..8f77ec4 --- /dev/null +++ b/arch/arm/include/asm/armv7_mpu.h @@ -0,0 +1,130 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics. + */ + +#ifndef _ASM_ARMV7_MPU_H +#define _ASM_ARMV7_MPU_H + +#ifdef CONFIG_CPU_V7M +#define AP_SHIFT 24 +#define XN_SHIFT 28 +#define TEX_SHIFT 19 +#define S_SHIFT 18 +#define C_SHIFT 17 +#define B_SHIFT 16 +#else /* CONFIG_CPU_V7R */ +#define XN_SHIFT 12 +#define AP_SHIFT 8 +#define TEX_SHIFT 3 +#define S_SHIFT 2 +#define C_SHIFT 1 +#define B_SHIFT 0 +#endif /* CONFIG_CPU_V7R */ + +#define CACHEABLE BIT(C_SHIFT) +#define BUFFERABLE BIT(B_SHIFT) +#define SHAREABLE BIT(S_SHIFT) +#define REGION_SIZE_SHIFT 1 +#define ENABLE_REGION BIT(0) +#define DISABLE_REGION 0 + +enum region_number { + REGION_0 = 0, + REGION_1, + REGION_2, + REGION_3, + REGION_4, + REGION_5, + REGION_6, + REGION_7, +}; + +enum ap { + NO_ACCESS = 0, + PRIV_RW_USR_NO, + PRIV_RW_USR_RO, + PRIV_RW_USR_RW, + UNPREDICTABLE, + PRIV_RO_USR_NO, + PRIV_RO_USR_RO, +}; + +enum mr_attr { + STRONG_ORDER = 0, + SHARED_WRITE_BUFFERED, + O_I_WT_NO_WR_ALLOC, + O_I_WB_NO_WR_ALLOC, + O_I_NON_CACHEABLE, + O_I_WB_RD_WR_ALLOC, + DEVICE_NON_SHARED, +}; +enum size { + REGION_8MB = 22, + REGION_16MB, + REGION_32MB, + REGION_64MB, + REGION_128MB, + REGION_256MB, + REGION_512MB, + REGION_1GB, + REGION_2GB, + REGION_4GB, +}; + +enum xn { + XN_DIS = 0, + XN_EN, +}; + +struct mpu_region_config { + uint32_t start_addr; + enum region_number region_no; + enum xn xn; + enum ap ap; + enum mr_attr mr_attr; + enum size reg_size; +}; + +void disable_mpu(void); +void enable_mpu(void); +int mpu_enabled(void); +void mpu_config(struct mpu_region_config *reg_config); +void setup_mpu_regions(struct mpu_region_config *rgns, u32 num_rgns); + +static inline u32 get_attr_encoding(u32 mr_attr) +{ + u32 attr; + + switch (mr_attr) { + case STRONG_ORDER: + attr = SHAREABLE; + break; + case SHARED_WRITE_BUFFERED: + attr = BUFFERABLE; + break; + case O_I_WT_NO_WR_ALLOC: + attr = CACHEABLE; + break; + case O_I_WB_NO_WR_ALLOC: + attr = CACHEABLE | BUFFERABLE; + break; + case O_I_NON_CACHEABLE: + attr = 1 << TEX_SHIFT; + break; + case O_I_WB_RD_WR_ALLOC: + attr = (1 << TEX_SHIFT) | CACHEABLE | BUFFERABLE; + break; + case DEVICE_NON_SHARED: + attr = (2 << TEX_SHIFT) | BUFFERABLE; + break; + default: + attr = 0; /* strongly ordered */ + break; + }; + + return attr; +} + +#endif /* _ASM_ARMV7_MPU_H */ |