1/*
 2 * OpenRISC cache.c
 3 *
 4 * Linux architectural port borrowing liberally from similar works of
 5 * others.  All original copyrights apply as per the original source
 6 * declaration.
 7 *
 8 * Modifications for the OpenRISC architecture:
 9 * Copyright (C) 2015 Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
10 *
11 *      This program is free software; you can redistribute it and/or
12 *      modify it under the terms of the GNU General Public License
13 *      as published by the Free Software Foundation; either version
14 *      2 of the License, or (at your option) any later version.
15 */
16
17#include <asm/spr.h>
18#include <asm/spr_defs.h>
19#include <asm/cache.h>
20#include <asm/cacheflush.h>
21#include <asm/tlbflush.h>
22
23static void cache_loop(struct page *page, const unsigned int reg)
24{
25	unsigned long paddr = page_to_pfn(page) << PAGE_SHIFT;
26	unsigned long line = paddr & ~(L1_CACHE_BYTES - 1);
27
28	while (line < paddr + PAGE_SIZE) {
29		mtspr(reg, line);
30		line += L1_CACHE_BYTES;
31	}
32}
33
34void local_dcache_page_flush(struct page *page)
35{
36	cache_loop(page, SPR_DCBFR);
37}
38EXPORT_SYMBOL(local_dcache_page_flush);
39
40void local_icache_page_inv(struct page *page)
41{
42	cache_loop(page, SPR_ICBIR);
43}
44EXPORT_SYMBOL(local_icache_page_inv);
45
46void update_cache(struct vm_area_struct *vma, unsigned long address,
47	pte_t *pte)
48{
49	unsigned long pfn = pte_val(*pte) >> PAGE_SHIFT;
50	struct page *page = pfn_to_page(pfn);
51	int dirty = !test_and_set_bit(PG_dc_clean, &page->flags);
52
53	/*
54	 * Since icaches do not snoop for updated data on OpenRISC, we
55	 * must write back and invalidate any dirty pages manually. We
56	 * can skip data pages, since they will not end up in icaches.
57	 */
58	if ((vma->vm_flags & VM_EXEC) && dirty)
59		sync_icache_dcache(page);
60}
61