1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * arch/sh/mm/cache-sh2.c
4  *
5  * Copyright (C) 2002 Paul Mundt
6  * Copyright (C) 2008 Yoshinori Sato
7  */
8 
9 #include <linux/init.h>
10 #include <linux/mm.h>
11 
12 #include <asm/cache.h>
13 #include <asm/addrspace.h>
14 #include <asm/processor.h>
15 #include <asm/cacheflush.h>
16 #include <asm/io.h>
17 
sh2__flush_wback_region(void * start,int size)18 static void sh2__flush_wback_region(void *start, int size)
19 {
20 	unsigned long v;
21 	unsigned long begin, end;
22 
23 	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
24 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
25 		& ~(L1_CACHE_BYTES-1);
26 	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
27 		unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0);
28 		int way;
29 		for (way = 0; way < 4; way++) {
30 			unsigned long data =  __raw_readl(addr | (way << 12));
31 			if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
32 				data &= ~SH_CACHE_UPDATED;
33 				__raw_writel(data, addr | (way << 12));
34 			}
35 		}
36 	}
37 }
38 
sh2__flush_purge_region(void * start,int size)39 static void sh2__flush_purge_region(void *start, int size)
40 {
41 	unsigned long v;
42 	unsigned long begin, end;
43 
44 	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
45 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
46 		& ~(L1_CACHE_BYTES-1);
47 
48 	for (v = begin; v < end; v+=L1_CACHE_BYTES)
49 		__raw_writel((v & CACHE_PHYSADDR_MASK),
50 			  CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
51 }
52 
sh2__flush_invalidate_region(void * start,int size)53 static void sh2__flush_invalidate_region(void *start, int size)
54 {
55 #ifdef CONFIG_CACHE_WRITEBACK
56 	/*
57 	 * SH-2 does not support individual line invalidation, only a
58 	 * global invalidate.
59 	 */
60 	unsigned long ccr;
61 	unsigned long flags;
62 	local_irq_save(flags);
63 	jump_to_uncached();
64 
65 	ccr = __raw_readl(SH_CCR);
66 	ccr |= CCR_CACHE_INVALIDATE;
67 	__raw_writel(ccr, SH_CCR);
68 
69 	back_to_cached();
70 	local_irq_restore(flags);
71 #else
72 	unsigned long v;
73 	unsigned long begin, end;
74 
75 	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
76 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
77 		& ~(L1_CACHE_BYTES-1);
78 
79 	for (v = begin; v < end; v+=L1_CACHE_BYTES)
80 		__raw_writel((v & CACHE_PHYSADDR_MASK),
81 			  CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
82 #endif
83 }
84 
sh2_cache_init(void)85 void __init sh2_cache_init(void)
86 {
87 	__flush_wback_region		= sh2__flush_wback_region;
88 	__flush_purge_region		= sh2__flush_purge_region;
89 	__flush_invalidate_region	= sh2__flush_invalidate_region;
90 }
91