/*
* Copyright (C) 2007-2009 Michal Simek <[email protected]>
* Copyright (C) 2007-2009 PetaLogix
* Copyright (C) 2007 John Williams <[email protected]>
* based on v850 version which was
* Copyright (C) 2001,02,03 NEC Electronics Corporation
* Copyright (C) 2001,02,03 Miles Bader <[email protected]>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
*/

#ifndef _ASM_MICROBLAZE_CACHEFLUSH_H
#define _ASM_MICROBLAZE_CACHEFLUSH_H

/* Somebody depends on this; sigh... */
#include <linux/mm.h>
#include <linux/io.h>

/* Look at Documentation/cachetlb.txt */

/*
* Cache handling functions.
* Microblaze has a write-through data cache, meaning that the data cache
* never needs to be flushed. The only flushing operations that are
* implemented are to invalidate the instruction cache. These are called
* after loading a user application into memory, we must invalidate the
* instruction cache to make sure we don't fetch old, bad code.
*/

/* struct cache, d=dcache, i=icache, fl = flush, iv = invalidate,
* suffix r = range */
struct scache {
/* icache */
void (*ie)(void); /* enable */
void (*id)(void); /* disable */
void (*ifl)(void); /* flush */
void (*iflr)(unsigned long a, unsigned long b);
void (*iin)(void); /* invalidate */
void (*iinr)(unsigned long a, unsigned long b);
/* dcache */
void (*de)(void); /* enable */
void (*dd)(void); /* disable */
void (*dfl)(void); /* flush */
void (*dflr)(unsigned long a, unsigned long b);
void (*din)(void); /* invalidate */
void (*dinr)(unsigned long a, unsigned long b);
};

/* microblaze cache */
extern struct scache *mbc;

void microblaze_cache_init(void);

#define enable_icache() mbc->ie();
#define disable_icache() mbc->id();
#define flush_icache() mbc->ifl();
#define flush_icache_range(start, end) mbc->iflr(start, end);
#define invalidate_icache() mbc->iin();
#define invalidate_icache_range(start, end) mbc->iinr(start, end);

#define flush_icache_user_range(vma, pg, adr, len) flush_icache();
#define flush_icache_page(vma, pg) do { } while (0)

#define enable_dcache() mbc->de();
#define disable_dcache() mbc->dd();
/* FIXME for LL-temac driver */
#define invalidate_dcache() mbc->din();
#define invalidate_dcache_range(start, end) mbc->dinr(start, end);
#define flush_dcache() mbc->dfl();
#define flush_dcache_range(start, end) mbc->dflr(start, end);

#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
/* MS: We have to implement it because of rootfs-jffs2 issue on WB */
#define flush_dcache_page(page) \
do { \
unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
addr = (u32)virt_to_phys((void *)addr); \
flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
} while (0);

#define flush_dcache_mmap_lock(mapping) do { } while (0)
#define flush_dcache_mmap_unlock(mapping) do { } while (0)

#define flush_cache_dup_mm(mm) do { } while (0)
#define flush_cache_vmap(start, end) do { } while (0)
#define flush_cache_vunmap(start, end) do { } while (0)
#define flush_cache_mm(mm) do { } while (0)

#define flush_cache_page(vma, vmaddr, pfn) \
flush_dcache_range(pfn << PAGE_SHIFT, (pfn << PAGE_SHIFT) + PAGE_SIZE);

/* MS: kgdb code use this macro, wrong len with FLASH */
#if 0
#define flush_cache_range(vma, start, len) { \
flush_icache_range((unsigned) (start), (unsigned) (start) + (len)); \
flush_dcache_range((unsigned) (start), (unsigned) (start) + (len)); \
}
#endif

#define flush_cache_range(vma, start, len) do { } while (0)

static inline void copy_to_user_page(struct vm_area_struct *vma,
struct page *page, unsigned long vaddr,
void *dst, void *src, int len)
{
u32 addr = virt_to_phys(dst);
memcpy(dst, src, len);
if (vma->vm_flags & VM_EXEC) {
invalidate_icache_range(addr, addr + PAGE_SIZE);
flush_dcache_range(addr, addr + PAGE_SIZE);
}
}

static inline void copy_from_user_page(struct vm_area_struct *vma,
struct page *page, unsigned long vaddr,
void *dst, void *src, int len)
{
memcpy(dst, src, len);
}

#endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */