1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * arch/sh/mm/cache-sh3.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 1999, 2000 Niibe Yutaka
6*4882a593Smuzhiyun * Copyright (C) 2002 Paul Mundt
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/init.h>
10*4882a593Smuzhiyun #include <linux/mman.h>
11*4882a593Smuzhiyun #include <linux/mm.h>
12*4882a593Smuzhiyun #include <linux/threads.h>
13*4882a593Smuzhiyun #include <asm/addrspace.h>
14*4882a593Smuzhiyun #include <asm/page.h>
15*4882a593Smuzhiyun #include <asm/processor.h>
16*4882a593Smuzhiyun #include <asm/cache.h>
17*4882a593Smuzhiyun #include <asm/io.h>
18*4882a593Smuzhiyun #include <linux/uaccess.h>
19*4882a593Smuzhiyun #include <asm/mmu_context.h>
20*4882a593Smuzhiyun #include <asm/cacheflush.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun * Write back the dirty D-caches, but not invalidate them.
24*4882a593Smuzhiyun *
25*4882a593Smuzhiyun * Is this really worth it, or should we just alias this routine
26*4882a593Smuzhiyun * to __flush_purge_region too?
27*4882a593Smuzhiyun *
28*4882a593Smuzhiyun * START: Virtual Address (U0, P1, or P3)
29*4882a593Smuzhiyun * SIZE: Size of the region.
30*4882a593Smuzhiyun */
31*4882a593Smuzhiyun
sh3__flush_wback_region(void * start,int size)32*4882a593Smuzhiyun static void sh3__flush_wback_region(void *start, int size)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun unsigned long v, j;
35*4882a593Smuzhiyun unsigned long begin, end;
36*4882a593Smuzhiyun unsigned long flags;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
39*4882a593Smuzhiyun end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
40*4882a593Smuzhiyun & ~(L1_CACHE_BYTES-1);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun for (v = begin; v < end; v+=L1_CACHE_BYTES) {
43*4882a593Smuzhiyun unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
44*4882a593Smuzhiyun for (j = 0; j < current_cpu_data.dcache.ways; j++) {
45*4882a593Smuzhiyun unsigned long data, addr, p;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun p = __pa(v);
48*4882a593Smuzhiyun addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
49*4882a593Smuzhiyun local_irq_save(flags);
50*4882a593Smuzhiyun data = __raw_readl(addr);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun if ((data & CACHE_PHYSADDR_MASK) ==
53*4882a593Smuzhiyun (p & CACHE_PHYSADDR_MASK)) {
54*4882a593Smuzhiyun data &= ~SH_CACHE_UPDATED;
55*4882a593Smuzhiyun __raw_writel(data, addr);
56*4882a593Smuzhiyun local_irq_restore(flags);
57*4882a593Smuzhiyun break;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun local_irq_restore(flags);
60*4882a593Smuzhiyun addrstart += current_cpu_data.dcache.way_incr;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun /*
66*4882a593Smuzhiyun * Write back the dirty D-caches and invalidate them.
67*4882a593Smuzhiyun *
68*4882a593Smuzhiyun * START: Virtual Address (U0, P1, or P3)
69*4882a593Smuzhiyun * SIZE: Size of the region.
70*4882a593Smuzhiyun */
sh3__flush_purge_region(void * start,int size)71*4882a593Smuzhiyun static void sh3__flush_purge_region(void *start, int size)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun unsigned long v;
74*4882a593Smuzhiyun unsigned long begin, end;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
77*4882a593Smuzhiyun end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
78*4882a593Smuzhiyun & ~(L1_CACHE_BYTES-1);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun for (v = begin; v < end; v+=L1_CACHE_BYTES) {
81*4882a593Smuzhiyun unsigned long data, addr;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
84*4882a593Smuzhiyun addr = CACHE_OC_ADDRESS_ARRAY |
85*4882a593Smuzhiyun (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
86*4882a593Smuzhiyun __raw_writel(data, addr);
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun
sh3_cache_init(void)90*4882a593Smuzhiyun void __init sh3_cache_init(void)
91*4882a593Smuzhiyun {
92*4882a593Smuzhiyun __flush_wback_region = sh3__flush_wback_region;
93*4882a593Smuzhiyun __flush_purge_region = sh3__flush_purge_region;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun /*
96*4882a593Smuzhiyun * No write back please
97*4882a593Smuzhiyun *
98*4882a593Smuzhiyun * Except I don't think there's any way to avoid the writeback.
99*4882a593Smuzhiyun * So we just alias it to sh3__flush_purge_region(). dwmw2.
100*4882a593Smuzhiyun */
101*4882a593Smuzhiyun __flush_invalidate_region = sh3__flush_purge_region;
102*4882a593Smuzhiyun }
103