1/*
2 * arch/sh/mm/tlb-pteaex.c
3 *
4 * TLB operations for SH-X3 CPUs featuring PTE ASID Extensions.
5 *
6 * Copyright (C) 2009 Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License.  See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/io.h>
15#include <asm/mmu_context.h>
16#include <asm/cacheflush.h>
17
18void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
19{
20	unsigned long flags, pteval, vpn;
21
22	/*
23	 * Handle debugger faulting in for debugee.
24	 */
25	if (vma && current->active_mm != vma->vm_mm)
26		return;
27
28	local_irq_save(flags);
29
30	/* Set PTEH register */
31	vpn = address & MMU_VPN_MASK;
32	__raw_writel(vpn, MMU_PTEH);
33
34	/* Set PTEAEX */
35	__raw_writel(get_asid(), MMU_PTEAEX);
36
37	pteval = pte.pte_low;
38
39	/* Set PTEA register */
40#ifdef CONFIG_X2TLB
41	/*
42	 * For the extended mode TLB this is trivial, only the ESZ and
43	 * EPR bits need to be written out to PTEA, with the remainder of
44	 * the protection bits (with the exception of the compat-mode SZ
45	 * and PR bits, which are cleared) being written out in PTEL.
46	 */
47	__raw_writel(pte.pte_high, MMU_PTEA);
48#endif
49
50	/* Set PTEL register */
51	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
52#ifdef CONFIG_CACHE_WRITETHROUGH
53	pteval |= _PAGE_WT;
54#endif
55	/* conveniently, we want all the software flags to be 0 anyway */
56	__raw_writel(pteval, MMU_PTEL);
57
58	/* Load the TLB */
59	asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
60	local_irq_restore(flags);
61}
62
63/*
64 * While SH-X2 extended TLB mode splits out the memory-mapped I/UTLB
65 * data arrays, SH-X3 cores with PTEAEX split out the memory-mapped
66 * address arrays. In compat mode the second array is inaccessible, while
67 * in extended mode, the legacy 8-bit ASID field in address array 1 has
68 * undefined behaviour.
69 */
70void local_flush_tlb_one(unsigned long asid, unsigned long page)
71{
72	jump_to_uncached();
73	__raw_writel(page, MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
74	__raw_writel(asid, MMU_UTLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
75	__raw_writel(page, MMU_ITLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
76	__raw_writel(asid, MMU_ITLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
77	back_to_cached();
78}
79
80void local_flush_tlb_all(void)
81{
82	unsigned long flags, status;
83	int i;
84
85	/*
86	 * Flush all the TLB.
87	 */
88	local_irq_save(flags);
89	jump_to_uncached();
90
91	status = __raw_readl(MMUCR);
92	status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
93
94	if (status == 0)
95		status = MMUCR_URB_NENTRIES;
96
97	for (i = 0; i < status; i++)
98		__raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
99
100	for (i = 0; i < 4; i++)
101		__raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
102
103	back_to_cached();
104	ctrl_barrier();
105	local_irq_restore(flags);
106}
107