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
32static 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 */
71static 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
90void __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