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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * arch/sh/mm/cache-sh3.c
4 *
5 * Copyright (C) 1999, 2000 Niibe Yutaka
6 * Copyright (C) 2002 Paul Mundt
7 */
8
9#include <linux/init.h>
10#include <linux/mman.h>
11#include <linux/mm.h>
12#include <linux/threads.h>
13#include <asm/addrspace.h>
14#include <asm/page.h>
15#include <asm/pgtable.h>
16#include <asm/processor.h>
17#include <asm/cache.h>
18#include <asm/io.h>
19#include <linux/uaccess.h>
20#include <asm/pgalloc.h>
21#include <asm/mmu_context.h>
22#include <asm/cacheflush.h>
23
24/*
25 * Write back the dirty D-caches, but not invalidate them.
26 *
27 * Is this really worth it, or should we just alias this routine
28 * to __flush_purge_region too?
29 *
30 * START: Virtual Address (U0, P1, or P3)
31 * SIZE: Size of the region.
32 */
33
34static void sh3__flush_wback_region(void *start, int size)
35{
36 unsigned long v, j;
37 unsigned long begin, end;
38 unsigned long flags;
39
40 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
41 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
42 & ~(L1_CACHE_BYTES-1);
43
44 for (v = begin; v < end; v+=L1_CACHE_BYTES) {
45 unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
46 for (j = 0; j < current_cpu_data.dcache.ways; j++) {
47 unsigned long data, addr, p;
48
49 p = __pa(v);
50 addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
51 local_irq_save(flags);
52 data = __raw_readl(addr);
53
54 if ((data & CACHE_PHYSADDR_MASK) ==
55 (p & CACHE_PHYSADDR_MASK)) {
56 data &= ~SH_CACHE_UPDATED;
57 __raw_writel(data, addr);
58 local_irq_restore(flags);
59 break;
60 }
61 local_irq_restore(flags);
62 addrstart += current_cpu_data.dcache.way_incr;
63 }
64 }
65}
66
67/*
68 * Write back the dirty D-caches and invalidate them.
69 *
70 * START: Virtual Address (U0, P1, or P3)
71 * SIZE: Size of the region.
72 */
73static void sh3__flush_purge_region(void *start, int size)
74{
75 unsigned long v;
76 unsigned long begin, end;
77
78 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
79 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
80 & ~(L1_CACHE_BYTES-1);
81
82 for (v = begin; v < end; v+=L1_CACHE_BYTES) {
83 unsigned long data, addr;
84
85 data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
86 addr = CACHE_OC_ADDRESS_ARRAY |
87 (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
88 __raw_writel(data, addr);
89 }
90}
91
92void __init sh3_cache_init(void)
93{
94 __flush_wback_region = sh3__flush_wback_region;
95 __flush_purge_region = sh3__flush_purge_region;
96
97 /*
98 * No write back please
99 *
100 * Except I don't think there's any way to avoid the writeback.
101 * So we just alias it to sh3__flush_purge_region(). dwmw2.
102 */
103 __flush_invalidate_region = sh3__flush_purge_region;
104}