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/processor.h>
16 #include <asm/cache.h>
17 #include <asm/io.h>
18 #include <linux/uaccess.h>
19 #include <asm/mmu_context.h>
20 #include <asm/cacheflush.h>
21
22 /*
23 * Write back the dirty D-caches, but not invalidate them.
24 *
25 * Is this really worth it, or should we just alias this routine
26 * to __flush_purge_region too?
27 *
28 * START: Virtual Address (U0, P1, or P3)
29 * SIZE: Size of the region.
30 */
31
32 static void sh3__flush_wback_region(void *start, int size)
33 {
34 unsigned long v, j;
35 unsigned long begin, end;
36 unsigned long flags;
37
38 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
39 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
40 & ~(L1_CACHE_BYTES-1);
41
42 for (v = begin; v < end; v+=L1_CACHE_BYTES) {
43 unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
44 for (j = 0; j < current_cpu_data.dcache.ways; j++) {
45 unsigned long data, addr, p;
46
47 p = __pa(v);
48 addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
49 local_irq_save(flags);
50 data = __raw_readl(addr);
51
52 if ((data & CACHE_PHYSADDR_MASK) ==
53 (p & CACHE_PHYSADDR_MASK)) {
54 data &= ~SH_CACHE_UPDATED;
55 __raw_writel(data, addr);
56 local_irq_restore(flags);
57 break;
58 }
59 local_irq_restore(flags);
60 addrstart += current_cpu_data.dcache.way_incr;
61 }
62 }
63 }
64
65 /*
66 * Write back the dirty D-caches and invalidate them.
67 *
68 * START: Virtual Address (U0, P1, or P3)
69 * SIZE: Size of the region.
70 */
71 static void sh3__flush_purge_region(void *start, int size)
72 {
73 unsigned long v;
74 unsigned long begin, end;
75
76 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
77 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
78 & ~(L1_CACHE_BYTES-1);
79
80 for (v = begin; v < end; v+=L1_CACHE_BYTES) {
81 unsigned long data, addr;
82
83 data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
84 addr = CACHE_OC_ADDRESS_ARRAY |
85 (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
86 __raw_writel(data, addr);
87 }
88 }
89
90 void __init sh3_cache_init(void)
91 {
92 __flush_wback_region = sh3__flush_wback_region;
93 __flush_purge_region = sh3__flush_purge_region;
94
95 /*
96 * No write back please
97 *
98 * Except I don't think there's any way to avoid the writeback.
99 * So we just alias it to sh3__flush_purge_region(). dwmw2.
100 */
101 __flush_invalidate_region = sh3__flush_purge_region;
102 }
103
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.