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/* linux/drivers/media/video/samsung/fimg2d4x/fimg2d_cache.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* Samsung Graphics 2D driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <linux/dma-mapping.h>
#include "fimg2d.h"
#include "fimg2d_cache.h"
#define LV1_SHIFT 20
#define LV1_PT_SIZE SZ_1M
#define LV2_PT_SIZE SZ_1K
#define LV2_BASE_MASK 0x3ff
#define LV2_PT_MASK 0xff000
#define LV2_SHIFT 12
#define LV1_DESC_MASK 0x3
#define LV2_DESC_MASK 0x2
static inline unsigned long virt2phys(struct mm_struct *mm, unsigned long vaddr)
{
unsigned long *pgd;
unsigned long *lv1d, *lv2d;
pgd = (unsigned long *)mm->pgd;
lv1d = pgd + (vaddr >> LV1_SHIFT);
if ((*lv1d & LV1_DESC_MASK) != 0x1) {
fimg2d_debug("invalid LV1 descriptor, "
"pgd %p lv1d 0x%lx vaddr 0x%lx\n",
pgd, *lv1d, vaddr);
return 0;
}
lv2d = (unsigned long *)phys_to_virt(*lv1d & ~LV2_BASE_MASK) +
((vaddr & LV2_PT_MASK) >> LV2_SHIFT);
if ((*lv2d & LV2_DESC_MASK) != 0x2) {
fimg2d_debug("invalid LV2 descriptor, "
"pgd %p lv2d 0x%lx vaddr 0x%lx\n",
pgd, *lv2d, vaddr);
return 0;
}
return (*lv2d & PAGE_MASK) | (vaddr & (PAGE_SIZE-1));
}
#ifdef CONFIG_OUTER_CACHE
void fimg2d_dma_sync_outer(struct mm_struct *mm, unsigned long vaddr,
size_t size, enum cache_opr opr)
{
int len;
unsigned long cur, end, next, paddr;
cur = vaddr;
end = vaddr + size;
if (opr == CACHE_CLEAN) {
while (cur < end) {
next = (cur + PAGE_SIZE) & PAGE_MASK;
if (next > end)
next = end;
len = next - cur;
paddr = virt2phys(mm, cur);
if (paddr)
outer_clean_range(paddr, paddr + len);
cur += len;
}
} else if (opr == CACHE_FLUSH) {
while (cur < end) {
next = (cur + PAGE_SIZE) & PAGE_MASK;
if (next > end)
next = end;
len = next - cur;
paddr = virt2phys(mm, cur);
if (paddr)
outer_flush_range(paddr, paddr + len);
cur += len;
}
}
}
void fimg2d_clean_outer_pagetable(struct mm_struct *mm, unsigned long vaddr,
size_t size)
{
unsigned long *pgd;
unsigned long *lv1, *lv1end;
unsigned long lv2pa;
pgd = (unsigned long *)mm->pgd;
lv1 = pgd + (vaddr >> LV1_SHIFT);
lv1end = pgd + ((vaddr + size + LV1_PT_SIZE-1) >> LV1_SHIFT);
/* clean level1 page table */
outer_clean_range(virt_to_phys(lv1), virt_to_phys(lv1end));
do {
lv2pa = *lv1 & ~LV2_BASE_MASK; /* lv2 pt base */
/* clean level2 page table */
outer_clean_range(lv2pa, lv2pa + LV2_PT_SIZE);
lv1++;
} while (lv1 != lv1end);
}
#endif /* CONFIG_OUTER_CACHE */
enum pt_status fimg2d_check_pagetable(struct mm_struct *mm, unsigned long vaddr,
size_t size)
{
unsigned long *pgd;
unsigned long *lv1d, *lv2d;
pgd = (unsigned long *)mm->pgd;
size += offset_in_page(vaddr);
size = PAGE_ALIGN(size);
while ((long)size > 0) {
lv1d = pgd + (vaddr >> LV1_SHIFT);
/*
* check level 1 descriptor
* lv1 desc[1:0] = 00 --> fault
* lv1 desc[1:0] = 01 --> page table
* lv1 desc[1:0] = 10 --> section or supersection
* lv1 desc[1:0] = 11 --> reserved
*/
if ((*lv1d & LV1_DESC_MASK) != 0x1) {
fimg2d_debug("invalid LV1 descriptor, "
"pgd %p lv1d 0x%lx vaddr 0x%lx\n",
pgd, *lv1d, vaddr);
return PT_FAULT;
}
lv2d = (unsigned long *)phys_to_virt(*lv1d & ~LV2_BASE_MASK) +
((vaddr & LV2_PT_MASK) >> LV2_SHIFT);
/*
* check level 2 descriptor
* lv2 desc[1:0] = 00 --> fault
* lv2 desc[1:0] = 01 --> 64k pgae
* lv2 desc[1:0] = 1x --> 4k page
*/
if ((*lv2d & LV2_DESC_MASK) != 0x2) {
fimg2d_debug("invalid LV2 descriptor, "
"pgd %p lv2d 0x%lx vaddr 0x%lx\n",
pgd, *lv2d, vaddr);
return PT_FAULT;
}
vaddr += PAGE_SIZE;
size -= PAGE_SIZE;
}
return PT_NORMAL;
}
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