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
16void __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
65void 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
82void 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