2 * arch/sh/mm/cache-sh7705.c
4 * Copyright (C) 1999, 2000 Niibe Yutaka
5 * Copyright (C) 2004 Alex Song
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
12 #include <linux/init.h>
13 #include <linux/mman.h>
16 #include <linux/threads.h>
17 #include <asm/addrspace.h>
19 #include <asm/pgtable.h>
20 #include <asm/processor.h>
21 #include <asm/cache.h>
23 #include <linux/uaccess.h>
24 #include <asm/pgalloc.h>
25 #include <asm/mmu_context.h>
26 #include <asm/cacheflush.h>
29 * The 32KB cache on the SH7705 suffers from the same synonym problem
32 static inline void cache_wback_all(void)
34 unsigned long ways
, waysize
, addrstart
;
36 ways
= current_cpu_data
.dcache
.ways
;
37 waysize
= current_cpu_data
.dcache
.sets
;
38 waysize
<<= current_cpu_data
.dcache
.entry_shift
;
40 addrstart
= CACHE_OC_ADDRESS_ARRAY
;
45 for (addr
= addrstart
;
46 addr
< addrstart
+ waysize
;
47 addr
+= current_cpu_data
.dcache
.linesz
) {
49 int v
= SH_CACHE_UPDATED
| SH_CACHE_VALID
;
51 data
= __raw_readl(addr
);
54 __raw_writel(data
& ~v
, addr
);
58 addrstart
+= current_cpu_data
.dcache
.way_incr
;
63 * Write back the range of D-cache, and purge the I-cache.
65 * Called from kernel/module.c:sys_init_module and routine for a.out format.
67 static void sh7705_flush_icache_range(void *args
)
69 struct flusher_data
*data
= args
;
70 unsigned long start
, end
;
75 __flush_wback_region((void *)start
, end
- start
);
79 * Writeback&Invalidate the D-cache of the page
81 static void __flush_dcache_page(unsigned long phys
)
83 unsigned long ways
, waysize
, addrstart
;
86 phys
|= SH_CACHE_VALID
;
89 * Here, phys is the physical address of the page. We check all the
90 * tags in the cache for those with the same page number as this page
91 * (by masking off the lowest 2 bits of the 19-bit tag; these bits are
92 * derived from the offset within in the 4k page). Matching valid
93 * entries are invalidated.
95 * Since 2 bits of the cache index are derived from the virtual page
96 * number, knowing this would reduce the number of cache entries to be
97 * searched by a factor of 4. However this function exists to deal with
98 * potential cache aliasing, therefore the optimisation is probably not
101 local_irq_save(flags
);
104 ways
= current_cpu_data
.dcache
.ways
;
105 waysize
= current_cpu_data
.dcache
.sets
;
106 waysize
<<= current_cpu_data
.dcache
.entry_shift
;
108 addrstart
= CACHE_OC_ADDRESS_ARRAY
;
113 for (addr
= addrstart
;
114 addr
< addrstart
+ waysize
;
115 addr
+= current_cpu_data
.dcache
.linesz
) {
118 data
= __raw_readl(addr
) & (0x1ffffC00 | SH_CACHE_VALID
);
120 data
&= ~(SH_CACHE_VALID
| SH_CACHE_UPDATED
);
121 __raw_writel(data
, addr
);
125 addrstart
+= current_cpu_data
.dcache
.way_incr
;
129 local_irq_restore(flags
);
133 * Write back & invalidate the D-cache of the page.
134 * (To avoid "alias" issues)
136 static void sh7705_flush_dcache_page(void *arg
)
138 struct page
*page
= arg
;
139 struct address_space
*mapping
= page_mapping(page
);
141 if (mapping
&& !mapping_mapped(mapping
))
142 clear_bit(PG_dcache_clean
, &page
->flags
);
144 __flush_dcache_page(__pa(page_address(page
)));
147 static void sh7705_flush_cache_all(void *args
)
151 local_irq_save(flags
);
156 local_irq_restore(flags
);
160 * Write back and invalidate I/D-caches for the page.
162 * ADDRESS: Virtual Address (U0 address)
164 static void sh7705_flush_cache_page(void *args
)
166 struct flusher_data
*data
= args
;
167 unsigned long pfn
= data
->addr2
;
169 __flush_dcache_page(pfn
<< PAGE_SHIFT
);
173 * This is called when a page-cache page is about to be mapped into a
174 * user process' address space. It offers an opportunity for a
175 * port to ensure d-cache/i-cache coherency if necessary.
177 * Not entirely sure why this is necessary on SH3 with 32K cache but
178 * without it we get occasional "Memory fault" when loading a program.
180 static void sh7705_flush_icache_page(void *page
)
182 __flush_purge_region(page_address(page
), PAGE_SIZE
);
185 void __init
sh7705_cache_init(void)
187 local_flush_icache_range
= sh7705_flush_icache_range
;
188 local_flush_dcache_page
= sh7705_flush_dcache_page
;
189 local_flush_cache_all
= sh7705_flush_cache_all
;
190 local_flush_cache_mm
= sh7705_flush_cache_all
;
191 local_flush_cache_dup_mm
= sh7705_flush_cache_all
;
192 local_flush_cache_range
= sh7705_flush_cache_all
;
193 local_flush_cache_page
= sh7705_flush_cache_page
;
194 local_flush_icache_page
= sh7705_flush_icache_page
;