1 // SPDX-License-Identifier: GPL-2.0-only
3 * arch/sh/mm/cache-sh3.c
5 * Copyright (C) 1999, 2000 Niibe Yutaka
6 * Copyright (C) 2002 Paul Mundt
9 #include <linux/init.h>
10 #include <linux/mman.h>
12 #include <linux/threads.h>
13 #include <asm/addrspace.h>
15 #include <asm/processor.h>
16 #include <asm/cache.h>
18 #include <linux/uaccess.h>
19 #include <asm/pgalloc.h>
20 #include <asm/mmu_context.h>
21 #include <asm/cacheflush.h>
24 * Write back the dirty D-caches, but not invalidate them.
26 * Is this really worth it, or should we just alias this routine
27 * to __flush_purge_region too?
29 * START: Virtual Address (U0, P1, or P3)
30 * SIZE: Size of the region.
33 static void sh3__flush_wback_region(void *start, int size)
36 unsigned long begin, end;
39 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
40 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
41 & ~(L1_CACHE_BYTES-1);
43 for (v = begin; v < end; v+=L1_CACHE_BYTES) {
44 unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
45 for (j = 0; j < current_cpu_data.dcache.ways; j++) {
46 unsigned long data, addr, p;
49 addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
50 local_irq_save(flags);
51 data = __raw_readl(addr);
53 if ((data & CACHE_PHYSADDR_MASK) ==
54 (p & CACHE_PHYSADDR_MASK)) {
55 data &= ~SH_CACHE_UPDATED;
56 __raw_writel(data, addr);
57 local_irq_restore(flags);
60 local_irq_restore(flags);
61 addrstart += current_cpu_data.dcache.way_incr;
67 * Write back the dirty D-caches and invalidate them.
69 * START: Virtual Address (U0, P1, or P3)
70 * SIZE: Size of the region.
72 static void sh3__flush_purge_region(void *start, int size)
75 unsigned long begin, end;
77 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
78 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
79 & ~(L1_CACHE_BYTES-1);
81 for (v = begin; v < end; v+=L1_CACHE_BYTES) {
82 unsigned long data, addr;
84 data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
85 addr = CACHE_OC_ADDRESS_ARRAY |
86 (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
87 __raw_writel(data, addr);
91 void __init sh3_cache_init(void)
93 __flush_wback_region = sh3__flush_wback_region;
94 __flush_purge_region = sh3__flush_purge_region;
97 * No write back please
99 * Except I don't think there's any way to avoid the writeback.
100 * So we just alias it to sh3__flush_purge_region(). dwmw2.
102 __flush_invalidate_region = sh3__flush_purge_region;