path: root/drivers/video/sgivwfb.c

/*
 *  linux/drivers/video/sgivwfb.c -- SGI DBE frame buffer device
 *
 *	Copyright (C) 1999 Silicon Graphics, Inc.
 *      Jeffrey Newquist, newquist@engr.sgi.som
 *
 *  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/kernel.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/mtrr.h>

#define INCLUDE_TIMING_TABLE_DATA
#define DBE_REG_BASE par->regs
#include <video/sgivw.h>

struct sgivw_par {
	struct asregs *regs;
	u32 cmap_fifo;
	u_long timing_num;
};

#define FLATPANEL_SGI_1600SW	5

/*
 *  RAM we reserve for the frame buffer. This defines the maximum screen
 *  size
 *
 *  The default can be overridden if the driver is compiled as a module
 */

/* set by arch/i386/kernel/setup.c */
extern unsigned long sgivwfb_mem_phys;
extern unsigned long sgivwfb_mem_size;

static int ypan = 0;
static int ywrap = 0;

static int flatpanel_id = -1;

static struct fb_fix_screeninfo sgivwfb_fix __initdata = {
	.id		= "SGI Vis WS FB",
	.type		= FB_TYPE_PACKED_PIXELS,
        .visual		= FB_VISUAL_PSEUDOCOLOR,
	.mmio_start	= DBE_REG_PHYS,
	.mmio_len	= DBE_REG_SIZE,
        .accel		= FB_ACCEL_NONE,
	.line_length	= 640,
};

static struct fb_var_screeninfo sgivwfb_var __initdata = {
	/* 640x480, 8 bpp */
	.xres		= 640,
	.yres		= 480,
	.xres_virtual	= 640,
	.yres_virtual	= 480,
	.bits_per_pixel	= 8,
	.red		= { 0, 8, 0 },
	.green		= { 0, 8, 0 },
	.blue		= { 0, 8, 0 },
	.height		= -1,
	.width		= -1,
	.pixclock	= 20000,
	.left_margin	= 64,
	.right_margin	= 64,
	.upper_margin	= 32,
	.lower_margin	= 32,
	.hsync_len	= 64,
	.vsync_len	= 2,
	.vmode		= FB_VMODE_NONINTERLACED
};

static struct fb_var_screeninfo sgivwfb_var1600sw __initdata = {
	/* 1600x1024, 8 bpp */
	.xres		= 1600,
	.yres		= 1024,
	.xres_virtual	= 1600,
	.yres_virtual	= 1024,
	.bits_per_pixel	= 8,
	.red		= { 0, 8, 0 },
	.green		= { 0, 8, 0 },
	.blue		= { 0, 8, 0 },
	.height		= -1,
	.width		= -1,
	.pixclock	= 9353,
	.left_margin	= 20,
	.right_margin	= 30,
	.upper_margin	= 37,
	.lower_margin	= 3,
	.hsync_len	= 20,
	.vsync_len	= 3,
	.vmode		= FB_VMODE_NONINTERLACED
};

/*
 *  Interface used by the world
 */
int sgivwfb_init(void);

static int sgivwfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info);
static int sgivwfb_set_par(struct fb_info *info);
static int sgivwfb_setcolreg(u_int regno, u_int red, u_int green,
			     u_int blue, u_int transp,
			     struct fb_info *info);
static int sgivwfb_mmap(struct fb_info *info, struct file *file,
			struct vm_area_struct *vma);

static struct fb_ops sgivwfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= sgivwfb_check_var,
	.fb_set_par	= sgivwfb_set_par,
	.fb_setcolreg	= sgivwfb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_mmap	= sgivwfb_mmap,
};

/*
 *  Internal routines
 */
static unsigned long bytes_per_pixel(int bpp)
{
	switch (bpp) {
		case 8:
			return 1;
		case 16:
			return 2;
		case 32:
			return 4;
		default:
			printk(KERN_INFO "sgivwfb: unsupported bpp %d\n", bpp);
			return 0;
	}
}

static unsigned long get_line_length(int xres_virtual, int bpp)
{
	return (xres_virtual * bytes_per_pixel(bpp));
}

/*
 * Function:	dbe_TurnOffDma
 * Parameters:	(None)
 * Description:	This should turn off the monitor and dbe.  This is used
 *              when switching between the serial console and the graphics
 *              console.
 */

static void dbe_TurnOffDma(struct sgivw_par *par)
{
	unsigned int readVal;
	int i;

	// Check to see if things are already turned off:
	// 1) Check to see if dbe is not using the internal dotclock.
	// 2) Check to see if the xy counter in dbe is already off.

	DBE_GETREG(ctrlstat, readVal);
	if (GET_DBE_FIELD(CTRLSTAT, PCLKSEL, readVal) < 2)
		return;

	DBE_GETREG(vt_xy, readVal);
	if (GET_DBE_FIELD(VT_XY, VT_FREEZE, readVal) == 1)
		return;

	// Otherwise, turn off dbe