1 /* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
2 /*
3 * Copyright (c) 2018 Microsemi Corporation
4 */
5
6 #ifndef __ASM_MACH_TLB_H
7 #define __ASM_MACH_TLB_H
8
9 #include <asm/mipsregs.h>
10 #include <mach/common.h>
11 #include <linux/sizes.h>
12
13 #define TLB_HI_MASK 0xffffe000
14 #define TLB_LO_MASK 0x3fffffff /* Masks off Fill bits */
15 #define TLB_LO_SHIFT 6 /* PFN Start bit */
16
17 #define PAGEMASK_SHIFT 13
18
19 #define MMU_PAGE_CACHED (3 << 3) /* C(5:3) Cache Coherency Attributes */
20 #define MMU_PAGE_UNCACHED (2 << 3) /* C(5:3) Cache Coherency Attributes */
21 #define MMU_PAGE_DIRTY BIT(2) /* = Writeable */
22 #define MMU_PAGE_VALID BIT(1)
23 #define MMU_PAGE_GLOBAL BIT(0)
24 #define MMU_REGIO_RO_C (MMU_PAGE_CACHED | MMU_PAGE_VALID | MMU_PAGE_GLOBAL)
25 #define MMU_REGIO_RO (MMU_PAGE_UNCACHED | MMU_PAGE_VALID | MMU_PAGE_GLOBAL)
26 #define MMU_REGIO_RW (MMU_PAGE_DIRTY | MMU_REGIO_RO)
27 #define MMU_REGIO_INVAL (MMU_PAGE_GLOBAL)
28
29 #define TLB_COUNT_MASK GENMASK(5, 0)
30 #define TLB_COUNT_OFF 25
31
get_tlb_count(void)32 static inline u32 get_tlb_count(void)
33 {
34 register u32 config1;
35
36 config1 = read_c0_config1();
37 config1 >>= TLB_COUNT_OFF;
38 config1 &= TLB_COUNT_MASK;
39
40 return 1 + config1;
41 }
42
create_tlb(int index,u32 offset,u32 size,u32 tlb_attrib1,u32 tlb_attrib2)43 static inline void create_tlb(int index, u32 offset, u32 size, u32 tlb_attrib1,
44 u32 tlb_attrib2)
45 {
46 register u32 tlb_mask, tlb_lo0, tlb_lo1;
47
48 tlb_mask = ((size >> 12) - 1) << PAGEMASK_SHIFT;
49 tlb_lo0 = tlb_attrib1 | (offset >> TLB_LO_SHIFT);
50 tlb_lo1 = tlb_attrib2 | ((offset + size) >> TLB_LO_SHIFT);
51
52 write_one_tlb(index, tlb_mask, offset & TLB_HI_MASK,
53 tlb_lo0 & TLB_LO_MASK, tlb_lo1 & TLB_LO_MASK);
54 }
55 #endif /* __ASM_MACH_TLB_H */
56