1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arch/sh/mm/tlb-sh4.c
4 *
5 * SH-4 specific TLB operations
6 *
7 * Copyright (C) 1999 Niibe Yutaka
8 * Copyright (C) 2002 - 2007 Paul Mundt
9 */
10 #include <linux/kernel.h>
11 #include <linux/mm.h>
12 #include <linux/io.h>
13 #include <asm/mmu_context.h>
14 #include <asm/cacheflush.h>
15
__update_tlb(struct vm_area_struct * vma,unsigned long address,pte_t pte)16 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
17 {
18 unsigned long flags, pteval, vpn;
19
20 /*
21 * Handle debugger faulting in for debugee.
22 */
23 if (vma && current->active_mm != vma->vm_mm)
24 return;
25
26 local_irq_save(flags);
27
28 /* Set PTEH register */
29 vpn = (address & MMU_VPN_MASK) | get_asid();
30 __raw_writel(vpn, MMU_PTEH);
31
32 pteval = pte.pte_low;
33
34 /* Set PTEA register */
35 #ifdef CONFIG_X2TLB
36 /*
37 * For the extended mode TLB this is trivial, only the ESZ and
38 * EPR bits need to be written out to PTEA, with the remainder of
39 * the protection bits (with the exception of the compat-mode SZ
40 * and PR bits, which are cleared) being written out in PTEL.
41 */
42 __raw_writel(pte.pte_high, MMU_PTEA);
43 #else
44 if (cpu_data->flags & CPU_HAS_PTEA) {
45 /* The last 3 bits and the first one of pteval contains
46 * the PTEA timing control and space attribute bits
47 */
48 __raw_writel(copy_ptea_attributes(pteval), MMU_PTEA);
49 }
50 #endif
51
52 /* Set PTEL register */
53 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
54 #ifdef CONFIG_CACHE_WRITETHROUGH
55 pteval |= _PAGE_WT;
56 #endif
57 /* conveniently, we want all the software flags to be 0 anyway */
58 __raw_writel(pteval, MMU_PTEL);
59
60 /* Load the TLB */
61 asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
62 local_irq_restore(flags);
63 }
64
local_flush_tlb_one(unsigned long asid,unsigned long page)65 void local_flush_tlb_one(unsigned long asid, unsigned long page)
66 {
67 unsigned long addr, data;
68
69 /*
70 * NOTE: PTEH.ASID should be set to this MM
71 * _AND_ we need to write ASID to the array.
72 *
73 * It would be simple if we didn't need to set PTEH.ASID...
74 */
75 addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT;
76 data = page | asid; /* VALID bit is off */
77 jump_to_uncached();
78 __raw_writel(data, addr);
79 back_to_cached();
80 }
81
local_flush_tlb_all(void)82 void local_flush_tlb_all(void)
83 {
84 unsigned long flags, status;
85 int i;
86
87 /*
88 * Flush all the TLB.
89 */
90 local_irq_save(flags);
91 jump_to_uncached();
92
93 status = __raw_readl(MMUCR);
94 status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
95
96 if (status == 0)
97 status = MMUCR_URB_NENTRIES;
98
99 for (i = 0; i < status; i++)
100 __raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
101
102 for (i = 0; i < 4; i++)
103 __raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
104
105 back_to_cached();
106 ctrl_barrier();
107 local_irq_restore(flags);
108 }
109