path: root/drivers/video/pm2fb.c

/*
 * Permedia2 framebuffer driver.
 *
 * 2.5/2.6 driver:
 * Copyright (c) 2003 Jim Hague (jim.hague@acm.org)
 *
 * based on 2.4 driver:
 * Copyright (c) 1998-2000 Ilario Nardinocchi (nardinoc@CS.UniBO.IT)
 * Copyright (c) 1999 Jakub Jelinek (jakub@redhat.com)
 *
 * and additional input from James Simmon's port of Hannu Mallat's tdfx
 * driver.
 *
 * I have a Creative Graphics Blaster Exxtreme card - pm2fb on x86.  I
 * have no access to other pm2fb implementations. Sparc (and thus
 * hopefully other big-endian) devices now work, thanks to a lot of
 * testing work by Ron Murray. I have no access to CVision hardware,
 * and therefore for now I am omitting the CVision code.
 *
 * Multiple boards support has been on the TODO list for ages.
 * Don't expect this to change.
 *
 * 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.
 *
 * 
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>

#include <video/permedia2.h>
#include <video/cvisionppc.h>

#if !defined(__LITTLE_ENDIAN) && !defined(__BIG_ENDIAN)
#error	"The endianness of the target host has not been defined."
#endif

#if !defined(CONFIG_PCI)
#error "Only generic PCI cards supported."
#endif

#undef PM2FB_MASTER_DEBUG
#ifdef PM2FB_MASTER_DEBUG
#define DPRINTK(a,b...)	printk(KERN_DEBUG "pm2fb: %s: " a, __FUNCTION__ , ## b)
#else
#define DPRINTK(a,b...)
#endif

/*
 * Driver data 
 */
static char *mode __devinitdata = NULL;

/*
 * The XFree GLINT driver will (I think to implement hardware cursor
 * support on TVP4010 and similar where there is no RAMDAC - see
 * comment in set_video) always request +ve sync regardless of what
 * the mode requires. This screws me because I have a Sun
 * fixed-frequency monitor which absolutely has to have -ve sync. So
 * these flags allow the user to specify that requests for +ve sync
 * should be silently turned in -ve sync.
 */
static int lowhsync __devinitdata = 0;
static int lowvsync __devinitdata = 0;

/*
 * The hardware state of the graphics card that isn't part of the
 * screeninfo.
 */
struct pm2fb_par
{
	pm2type_t	type;		/* Board type */
	u32		fb_size;	/* framebuffer memory size */
	unsigned char	__iomem *v_fb;  /* virtual address of frame buffer */
	unsigned char	__iomem *v_regs;/* virtual address of p_regs */
	u32 	   	memclock;	/* memclock */
	u32		video;		/* video flags before blanking */
	u32		mem_config;	/* MemConfig reg at probe */
	u32		mem_control;	/* MemControl reg at probe */
	u32		boot_address;	/* BootAddress reg at probe */
};

/*
 * Here we define the default structs fb_fix_screeninfo and fb_var_screeninfo
 * if we don't use modedb.
 */
static struct fb_fix_screeninfo pm2fb_fix __devinitdata = {
	.id =		"", 
	.type =		FB_TYPE_PACKED_PIXELS,
	.visual =	FB_VISUAL_PSEUDOCOLOR,
	.xpanstep =	1,
	.ypanstep =	1,
	.ywrapstep =	0, 
	.accel =	FB_ACCEL_NONE,
};

/*
 * Default video mode. In case the modedb doesn't work.
 */
static struct fb_var_screeninfo pm2fb_var __devinitdata = {
	/* "640x480, 8 bpp @ 60 Hz */
	.xres =		640,
	.yres =		480,
	.xres_virtual =	640,
	.yres_virtual =	480,
	.bits_per_pixel =8<