1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
4  * Copyright (C) 2007-2009 PetaLogix
5  * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
6  * based on v850 version which was
7  * Copyright (C) 2001,02,03 NEC Electronics Corporation
8  * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
9  */
10 
11 #ifndef _ASM_MICROBLAZE_CACHEFLUSH_H
12 #define _ASM_MICROBLAZE_CACHEFLUSH_H
13 
14 /* Somebody depends on this; sigh... */
15 #include <linux/mm.h>
16 #include <linux/io.h>
17 
18 /* Look at Documentation/core-api/cachetlb.rst */
19 
20 /*
21  * Cache handling functions.
22  * Microblaze has a write-through data cache, meaning that the data cache
23  * never needs to be flushed.  The only flushing operations that are
24  * implemented are to invalidate the instruction cache.  These are called
25  * after loading a user application into memory, we must invalidate the
26  * instruction cache to make sure we don't fetch old, bad code.
27  */
28 
29 /* struct cache, d=dcache, i=icache, fl = flush, iv = invalidate,
30  * suffix r = range */
31 struct scache {
32 	/* icache */
33 	void (*ie)(void); /* enable */
34 	void (*id)(void); /* disable */
35 	void (*ifl)(void); /* flush */
36 	void (*iflr)(unsigned long a, unsigned long b);
37 	void (*iin)(void); /* invalidate */
38 	void (*iinr)(unsigned long a, unsigned long b);
39 	/* dcache */
40 	void (*de)(void); /* enable */
41 	void (*dd)(void); /* disable */
42 	void (*dfl)(void); /* flush */
43 	void (*dflr)(unsigned long a, unsigned long b);
44 	void (*din)(void); /* invalidate */
45 	void (*dinr)(unsigned long a, unsigned long b);
46 };
47 
48 /* microblaze cache */
49 extern struct scache *mbc;
50 
51 void microblaze_cache_init(void);
52 
53 #define enable_icache()					mbc->ie();
54 #define disable_icache()				mbc->id();
55 #define flush_icache()					mbc->ifl();
56 #define flush_icache_range(start, end)			mbc->iflr(start, end);
57 #define invalidate_icache()				mbc->iin();
58 #define invalidate_icache_range(start, end)		mbc->iinr(start, end);
59 
60 #define enable_dcache()					mbc->de();
61 #define disable_dcache()				mbc->dd();
62 /* FIXME for LL-temac driver */
63 #define invalidate_dcache()				mbc->din();
64 #define invalidate_dcache_range(start, end)		mbc->dinr(start, end);
65 #define flush_dcache()					mbc->dfl();
66 #define flush_dcache_range(start, end)			mbc->dflr(start, end);
67 
68 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
69 /* MS: We have to implement it because of rootfs-jffs2 issue on WB */
70 #define flush_dcache_page(page) \
71 do { \
72 	unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
73 	addr = (u32)virt_to_phys((void *)addr); \
74 	flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
75 } while (0);
76 
77 #define flush_cache_page(vma, vmaddr, pfn) \
78 	flush_dcache_range(pfn << PAGE_SHIFT, (pfn << PAGE_SHIFT) + PAGE_SIZE);
79 
copy_to_user_page(struct vm_area_struct * vma,struct page * page,unsigned long vaddr,void * dst,void * src,int len)80 static inline void copy_to_user_page(struct vm_area_struct *vma,
81 				     struct page *page, unsigned long vaddr,
82 				     void *dst, void *src, int len)
83 {
84 	u32 addr = virt_to_phys(dst);
85 	memcpy(dst, src, len);
86 	if (vma->vm_flags & VM_EXEC) {
87 		invalidate_icache_range(addr, addr + PAGE_SIZE);
88 		flush_dcache_range(addr, addr + PAGE_SIZE);
89 	}
90 }
91 #define copy_to_user_page copy_to_user_page
92 
93 #include <asm-generic/cacheflush.h>
94 
95 #endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */
96