path: root/drivers/video/vermilion/vermilion.c

/*
 * Copyright (c) Intel Corp. 2007.
 * All Rights Reserved.
 *
 * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
 * develop this driver.
 *
 * This file is part of the Vermilion Range fb driver.
 * The Vermilion Range fb driver is free software;
 * you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Vermilion Range fb driver is distributed
 * in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this driver; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Authors:
 *   Thomas Hellström <thomas-at-tungstengraphics-dot-com>
 *   Michel Dänzer <michel-at-tungstengraphics-dot-com>
 *   Alan Hourihane <alanh-at-tungstengraphics-dot-com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/pci.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <linux/mmzone.h>

/* #define VERMILION_DEBUG */

#include "vermilion.h"

#define MODULE_NAME "vmlfb"

#define VML_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)

static struct mutex vml_mutex;
static struct list_head global_no_mode;
static struct list_head global_has_mode;
static struct fb_ops vmlfb_ops;
static struct vml_sys *subsys = NULL;
static char *vml_default_mode = "1024x768@60";
static struct fb_videomode defaultmode = {
	NULL, 60, 1024, 768, 12896, 144, 24, 29, 3, 136, 6,
	0, FB_VMODE_NONINTERLACED
};

static u32 vml_mem_requested = (10 * 1024 * 1024);
static u32 vml_mem_contig = (4 * 1024 * 1024);
static u32 vml_mem_min = (4 * 1024 * 1024);

static u32 vml_clocks[] = {
	6750,
	13500,
	27000,
	29700,
	37125,
	54000,
	59400,
	74250,
	120000,
	148500
};

static u32 vml_num_clocks = ARRAY_SIZE(vml_clocks);

/*
 * Allocate a contiguous vram area and make its linear kernel map
 * uncached.
 */

static int vmlfb_alloc_vram_area(struct vram_area *va, unsigned max_order,
				 unsigned min_order)
{
	gfp_t flags;
	unsigned long i;

	max_order++;
	do {
		/*
		 * Really try hard to get the needed memory.
		 * We need memory below the first 32MB, so we
		 * add the __GFP_DMA flag that guarantees that we are
		 * below the first 16MB.
		 */

		flags = __GFP_DMA | __GFP_HIGH;
		va->logical =
			 __get_free_pages(flags, --max_order);
	} while (va->logical == 0 && max_order > min_order);

	if (!va->logical)
		return -ENOMEM;

	va->phys = virt_to_phys((void *)va->logical);
	va->size = PAGE_SIZE << max_order;
	va->order = max_order;

	/*
	 * It seems like __get_free_pages only ups the usage count
	 * of the first page. This doesn't work with fault mapping, so
	 * up the usage count once more (XXX: should use split_page or
	 * compound page).
	 */

	memset((void *)va->logical, 0x00, va->size);
	for (i = va->logical; i < va->logical + va->size; i += PAGE_SIZE) {
		get_page(virt_to_page(i));
	}

	/*
	 * Change caching policy of the linear kernel map to avoid
	 * mapping type conflicts with user-space mappings.
	 */
	set_pages_uc(virt_to_page(va->logical), va->size >>