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/*
* gcmain.c
*
* Copyright (C) 2010-2011 Vivante Corporation.
*
* This package 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.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <linux/pagemap.h>
#include <linux/dma-mapping.h>
#include "gcmain.h"
#define GCZONE_NONE 0
#define GCZONE_ALL (~0U)
#define GCZONE_CACHED (1 << 0)
#define GCZONE_NONCACHED (1 << 1)
#define GCZONE_FLUSH (1 << 2)
GCDBG_FILTERDEF(mem, GCZONE_NONE,
"cached",
"noncached",
"flush")
enum gcerror gc_alloc_noncached(struct gcpage *p, unsigned int size)
{
enum gcerror gcerror;
GCENTERARG(GCZONE_NONCACHED, "p = 0x%08X\n", (unsigned int) p);
p->pages = NULL;
p->order = 0;
p->size = (size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
p->logical = NULL;
p->physical = ~0UL;
GCDBG(GCZONE_NONCACHED, "requested size=%d\n", size);
GCDBG(GCZONE_NONCACHED, "aligned size=%d\n", p->size);
p->logical = dma_alloc_coherent(NULL, p->size, &p->physical,
GFP_KERNEL);
if (!p->logical) {
GCERR("failed to allocate memory\n");
gcerror = GCERR_OOPM;
goto exit;
}
GCDBG(GCZONE_NONCACHED, "logical=0x%08X\n",
(unsigned int) p->logical);
GCDBG(GCZONE_NONCACHED, "physical=0x%08X\n",
(unsigned int) p->physical);
GCEXIT(GCZONE_NONCACHED);
return GCERR_NONE;
exit:
gc_free_noncached(p);
GCEXITARG(GCZONE_NONCACHED, "gcerror = 0x%08X\n", gcerror);
return gcerror;
}
void gc_free_noncached(struct gcpage *p)
{
GCENTERARG(GCZONE_NONCACHED, "p = 0x%08X\n", (unsigned int) p);
if (p->logical != NULL) {
dma_free_coherent(NULL, p->size, p->logical, p->physical);
p->logical = NULL;
}
p->physical = ~0UL;
p->size = 0;
GCEXIT(GCZONE_NONCACHED);
}
enum gcerror gc_alloc_cached(struct gcpage *p, unsigned int size)
{
enum gcerror gcerror;
struct page *pages;
int count;
GCENTERARG(GCZONE_CACHED, "p = 0x%08X\n", (unsigned int) p);
p->order = get_order(size);
p->pages = NULL;
p->size = (1 << p->order) * PAGE_SIZE;
p->logical = NULL;
p->physical = ~0UL;
GCDBG(GCZONE_CACHED, "requested size=%d\n", size);
GCDBG(GCZONE_CACHED, "aligned size=%d\n", p->size);
p->pages = alloc_pages(GFP_KERNEL, p->order);
if (p->pages == NULL) {
GCERR("failed to allocate memory\n");
gcerror = GCERR_OOPM;
goto exit;
}
p->physical = page_to_phys(p->pages);
p->logical = (unsigned int *) page_address(p->pages);
if (p->logical == NULL) {
GCERR("failed to retrieve page virtual address\n");
gcerror = GCERR_PMMAP;
goto exit;
}
/* Reserve pages. */
pages = p->pages;
count = p->size / PAGE_SIZE;
while (count--)
SetPageReserved(pages++);
GCDBG(GCZONE_CACHED, "page array=0x%08X\n", (unsigned int) p->pages);
GCDBG(GCZONE_CACHED, "logical=0x%08X\n", (unsigned int) p->logical);
GCDBG(GCZONE_CACHED, "physical=0x%08X\n", (unsigned int) p->physical);
GCEXIT(GCZONE_CACHED);
return GCERR_NONE;
exit:
gc_free_cached(p);
GCEXITARG(GCZONE_CACHED, "gcerror = 0x%08X\n", gcerror);
return gcerror;
}
void gc_free_cached(struct gcpage *p)
{
GCENTERARG(GCZONE_CACHED, "p = 0x%08X\n", (unsigned int) p);
GCDBG(GCZONE_CACHED, "page array=0x%08X\n", (unsigned int) p->pages);
GCDBG(GCZONE_CACHED, "logical=0x%08X\n", (unsigned int) p->logical);
GCDBG(GCZONE_CACHED, "physical=0x%08X\n", (unsigned int) p->physical);
GCDBG(GCZONE_CACHED, "size=%d\n", p->size);
if (p->logical != NULL) {
struct page *pages;
int count;
pages = p->pages;
count = p->size / PAGE_SIZE;
while (count--)
ClearPageReserved(pages++);
p->logical = NULL;
}
if (p->pages != NULL) {
__free_pages(p->pages, p->order);
p->pages = NULL;
}
p->physical = ~0UL;
p->order = 0;
p->size = 0;
GCEXIT(GCZONE_CACHED);
}
void gc_flush_cached(struct gcpage *p)
{
GCENTERARG(GCZONE_FLUSH, "p = 0x%08X\n", (unsigned int) p);
dmac_flush_range(p->logical, (unsigned char *) p->logical + p->size);
outer_flush_range(p->physical, p->physical + p->size);
GCEXIT(GCZONE_FLUSH);
}
void gc_flush_region(unsigned int physical, void *logical,
unsigned int offset, unsigned int size)
{
unsigned char *startlog;
unsigned int startphys;
GCENTER(GCZONE_FLUSH);
GCDBG(GCZONE_FLUSH, "logical=0x%08X\n", (unsigned int) logical);
GCDBG(GCZONE_FLUSH, "physical=0x%08X\n", physical);
GCDBG(GCZONE_FLUSH, "offset=%d\n", offset);
GCDBG(GCZONE_FLUSH, "size=%d\n", size);
startlog = (unsigned char *) logical + offset;
startphys = physical + offset;
dmac_flush_range(startlog, startlog + size);
outer_flush_range(startphys, startphys + size);
GCEXIT(GCZONE_FLUSH);
}
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