1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ARM_MPU_H
 3#define __ARM_MPU_H
 4
 5/* MPUIR layout */
 6#define MPUIR_nU		1
 7#define MPUIR_DREGION		8
 8#define MPUIR_IREGION		16
 9#define MPUIR_DREGION_SZMASK	(0xFF << MPUIR_DREGION)
10#define MPUIR_IREGION_SZMASK	(0xFF << MPUIR_IREGION)
11
12/* ID_MMFR0 data relevant to MPU */
13#define MMFR0_PMSA		(0xF << 4)
14#define MMFR0_PMSAv7		(3 << 4)
15
16/* MPU D/I Size Register fields */
17#define MPU_RSR_SZ		1
18#define MPU_RSR_EN		0
19#define MPU_RSR_SD		8
20
21/* Number of subregions (SD) */
22#define MPU_NR_SUBREGS		8
23#define MPU_MIN_SUBREG_SIZE	256
24
25/* The D/I RSR value for an enabled region spanning the whole of memory */
26#define MPU_RSR_ALL_MEM		63
27
28/* Individual bits in the DR/IR ACR */
29#define MPU_ACR_XN		(1 << 12)
30#define MPU_ACR_SHARED		(1 << 2)
31
32/* C, B and TEX[2:0] bits only have semantic meanings when grouped */
33#define MPU_RGN_CACHEABLE	0xB
34#define MPU_RGN_SHARED_CACHEABLE (MPU_RGN_CACHEABLE | MPU_ACR_SHARED)
35#define MPU_RGN_STRONGLY_ORDERED 0
36
37/* Main region should only be shared for SMP */
38#ifdef CONFIG_SMP
39#define MPU_RGN_NORMAL		(MPU_RGN_CACHEABLE | MPU_ACR_SHARED)
40#else
41#define MPU_RGN_NORMAL		MPU_RGN_CACHEABLE
42#endif
43
44/* Access permission bits of ACR (only define those that we use)*/
45#define MPU_AP_PL1RO_PL0NA	(0x5 << 8)
46#define MPU_AP_PL1RW_PL0RW	(0x3 << 8)
47#define MPU_AP_PL1RW_PL0R0	(0x2 << 8)
48#define MPU_AP_PL1RW_PL0NA	(0x1 << 8)
49
50/* For minimal static MPU region configurations */
51#define MPU_PROBE_REGION	0
52#define MPU_BG_REGION		1
53#define MPU_RAM_REGION		2
54#define MPU_ROM_REGION		3
55
56/* Maximum number of regions Linux is interested in */
57#define MPU_MAX_REGIONS		16
58
59#define MPU_DATA_SIDE		0
60#define MPU_INSTR_SIDE		1
61
62#ifndef __ASSEMBLY__
63
64struct mpu_rgn {
65	/* Assume same attributes for d/i-side  */
66	u32 drbar;
67	u32 drsr;
68	u32 dracr;
69};
70
71struct mpu_rgn_info {
72	unsigned int used;
73	struct mpu_rgn rgns[MPU_MAX_REGIONS];
74};
75extern struct mpu_rgn_info mpu_rgn_info;
76
77#ifdef CONFIG_ARM_MPU
78
79extern void __init adjust_lowmem_bounds_mpu(void);
80extern void __init mpu_setup(void);
81
82#else
83
84static inline void adjust_lowmem_bounds_mpu(void) {}
85static inline void mpu_setup(void) {}
86
87#endif /* !CONFIG_ARM_MPU */
88
89#endif /* __ASSEMBLY__ */
90
91#endif