patch-2.1.112 linux/drivers/video/controlfb.c

• Lines: 998
• Date: Sun Jul 26 14:40:19 1998
• Orig file: v2.1.111/linux/drivers/video/controlfb.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.111/linux/drivers/video/controlfb.c linux/drivers/video/controlfb.c
@@ -0,0 +1,997 @@
+/*
+ *  controlfb.c -- frame buffer device for the PowerMac 'control' display
+ *
+ *  Created 12 July 1998 by Dan Jacobowitz <dan@debian.org>
+ *  Copyright (C) 1998 Dan Jacobowitz
+ *
+ *  Frame buffer structure from:
+ *    drivers/video/chipsfb.c -- frame buffer device for
+ *    Chips & Technologies 65550 chip.
+ *
+ *    Copyright (C) 1998 Paul Mackerras
+ *
+ *    This file is derived from the Powermac "chips" driver:
+ *    Copyright (C) 1997 Fabio Riccardi.
+ *    And from the frame buffer device for Open Firmware-initialized devices:
+ *    Copyright (C) 1997 Geert Uytterhoeven.
+ *
+ *  Hardware information from:
+ *    control.c: Console support for PowerMac "control" display adaptor.
+ *    Copyright (C) 1996 Paul Mackerras
+ *
+ *  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/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/malloc.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/selection.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/nvram.h>
+#ifdef CONFIG_FB_COMPAT_XPMAC
+#include <asm/vc_ioctl.h>
+#endif
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/pgtable.h>
+#include <asm/adb.h>
+#include <asm/cuda.h>
+
+#include "fbcon.h"
+#include "fbcon-cfb8.h"
+#include "fbcon-cfb16.h"
+#include "fbcon-cfb32.h"
+
+#include "macmodes.h"
+#include "controlfb.h"
+
+static int currcon = 0;
+static int switching = 0;
+
+struct fb_par_control {
+	int	vmode, cmode;
+	int	xres, yres;
+	int	vxres, vyres;
+	int	xoffset, yoffset;
+};
+
+struct fb_info_control {
+	struct fb_info			info;
+	struct fb_fix_screeninfo	fix;
+	struct fb_var_screeninfo	var;
+	struct display			disp;
+	struct fb_par_control		par;
+	struct {
+		__u8 red, green, blue;
+	}			palette[256];
+	
+	struct cmap_regs	*cmap_regs;
+	unsigned long		cmap_regs_phys;
+	
+	struct control_regs	*control_regs;
+	unsigned long		control_regs_phys;
+	
+	__u8			*frame_buffer;
+	unsigned long		frame_buffer_phys;
+	
+	int			sense, control_use_bank2;
+	unsigned long		total_vram;
+};
+
+/*
+ * Exported functions
+ */
+void control_init(void);
+void control_of_init(struct device_node *dp);
+
+static int control_open(struct fb_info *info, int user);
+static int control_release(struct fb_info *info, int user);
+static int control_get_fix(struct fb_fix_screeninfo *fix, int con,
+			 struct fb_info *info);
+static int control_get_var(struct fb_var_screeninfo *var, int con,
+			 struct fb_info *info);
+static int control_set_var(struct fb_var_screeninfo *var, int con,
+			 struct fb_info *info);
+static int control_pan_display(struct fb_var_screeninfo *var, int con,
+			     struct fb_info *info);
+static int control_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+			  struct fb_info *info);
+static int control_set_cmap(struct fb_cmap *cmap, int kspc, int con,
+			  struct fb_info *info);
+static int control_ioctl(struct inode *inode, struct file *file, u_int cmd,
+		       u_long arg, int con, struct fb_info *info);
+
+static int read_control_sense(struct fb_info_control *p);
+static inline int control_vram_reqd(int video_mode, int color_mode);
+static void set_control_clock(unsigned char *params);
+static void control_set_hardware(struct fb_info_control *p);
+static void control_par_to_all(struct fb_info_control *p, int init);
+static inline void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var);
+static int control_var_to_par(struct fb_var_screeninfo *var,
+	struct fb_par_control *par, const struct fb_info *fb_info);
+
+static void control_init_info(struct fb_info *info, struct fb_info_control *p);
+static void control_par_to_display(struct fb_par_control *par,
+  struct display *disp, struct fb_fix_screeninfo *fix, struct fb_info_control *p);
+static void control_init_display(struct display *disp);
+static void control_par_to_fix(struct fb_par_control *par, struct fb_fix_screeninfo *fix,
+	struct fb_info_control *p);
+static void control_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_control *p);
+
+static struct fb_ops controlfb_ops = {
+	control_open,
+	control_release,
+	control_get_fix,
+	control_get_var,
+	control_set_var,
+	control_get_cmap,
+	control_set_cmap,
+	control_pan_display,
+	control_ioctl
+};
+
+static int controlfb_getcolreg(u_int regno, u_int *red, u_int *green,
+			     u_int *blue, u_int *transp, struct fb_info *info);
+static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			     u_int transp, struct fb_info *info);
+static void do_install_cmap(int con, struct fb_info *info);
+
+
+__openfirmware
+
+
+static int control_open(struct fb_info *info, int user)
+{
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static int control_release(struct fb_info *info, int user)
+{
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+static int control_get_fix(struct fb_fix_screeninfo *fix, int con,
+			 struct fb_info *info)
+{
+	struct fb_info_control *cp = (struct fb_info_control *) info;
+
+	*fix = cp->fix;
+	return 0;
+}
+
+static int control_get_var(struct fb_var_screeninfo *var, int con,
+			 struct fb_info *info)
+{
+	struct fb_info_control *cp = (struct fb_info_control *) info;
+
+	*var = cp->var;
+	return 0;
+}
+
+/* Sets everything according to var */
+static int control_set_var(struct fb_var_screeninfo *var, int con,
+			 struct fb_info *info)
+{
+	struct fb_info_control *p = (struct fb_info_control *) info;
+	struct display *disp;
+	struct fb_par_control par;
+	int depthchange, err;
+
+	disp = (con >= 0) ? &fb_display[con] : &p->disp;
+	if((err = control_var_to_par(var, &par, info))) {
+		printk (KERN_ERR "Error in control_set_var, calling control_var_to_par: %d.\n", err);
+		return err;
+	}
+	
+	if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) {
+		printk("Not activating, in control_set_var.\n");
+		control_par_to_var(&par, var);
+		return 0;
+	}
+/* I know, we want to use fb_display[con], but grab certain info from p->var instead. */
+#define DIRTY(x) (p->var.x != var->x)
+	depthchange = DIRTY(bits_per_pixel);
+	if(!DIRTY(xres) && !DIRTY(yres) && !DIRTY(xres_virtual) &&
+	   !DIRTY(yres_virtual) && !DIRTY(bits_per_pixel)) {
+	   	control_par_to_var(&par, var);
+		p->var = disp->var = *var;
+		return 0;
+	}
+printk("Original bpp is %d, new bpp %d.\n", p->var.bits_per_pixel, var->bits_per_pixel);
+	/* OK, we're getting here at the right times... */
+	p->par = par;
+	control_par_to_var(&par, var);
+	p->var = *var;
+	control_par_to_fix(&par, &p->fix, p);
+	control_par_to_display(&par, disp, &p->fix, p);
+	p->disp = *disp;
+	
+	if(info->changevar && !switching)	/* Don't want to do this if just switching consoles. */
+		(*info->changevar)(con);
+	if(con == currcon)
+		control_set_hardware(p);
+	if(depthchange)
+		if((err = fb_alloc_cmap(&disp->cmap, 0, 0)))
+			return err;
+	if(depthchange || switching)
+		do_install_cmap(con, info);
+	return 0;
+}
+
+static int control_pan_display(struct fb_var_screeninfo *var, int con,
+			     struct fb_info *info)
+{
+	if (var->xoffset != 0 || var->yoffset != 0)
+		return -EINVAL;
+	return 0;
+}
+
+static int control_get_cmap(struct fb_cmap *cmap, int kspc, int con,
+			  struct fb_info *info)
+{
+	if (con == currcon)		/* current console? */
+		return fb_get_cmap(cmap, &fb_display[con].var, kspc,
+				   controlfb_getcolreg, info);
+	if (fb_display[con].cmap.len)	/* non default colormap? */
+		fb_copy_cmap(&fb_display[con].cmap, cmap, kspc? 0: 2);
+	else {
+		int size = fb_display[con].var.bits_per_pixel == 16 ? 32 : 256;
+		fb_copy_cmap(fb_default_cmap(size), cmap, kspc ? 0 : 2);
+	}
+	return 0;
+}
+
+static int control_set_cmap(struct fb_cmap *cmap, int kspc, int con,
+			 struct fb_info *info)
+{
+	struct display *disp = &fb_display[con];
+	int err;
+
+	if (disp->cmap.len == 0) {
+		int size = fb_display[con].var.bits_per_pixel == 16 ? 32 : 256;
+		err = fb_alloc_cmap(&disp->cmap, size, 0);
+		if (err)
+			return err;
+	}
+
+	if (con == currcon)
+		return fb_set_cmap(cmap, &disp->var, kspc, controlfb_setcolreg,
+				   info);
+	fb_copy_cmap(cmap, &disp->cmap, kspc ? 0 : 1);
+	return 0;
+}
+
+static int control_ioctl(struct inode *inode, struct file *file, u_int cmd,
+		       u_long arg, int con, struct fb_info *info)
+{
+	return -EINVAL;
+}
+
+static int controlfb_switch(int con, struct fb_info *info)
+{
+	if (fb_display[currcon].cmap.len)
+		fb_get_cmap(&fb_display[currcon].cmap,
+			    &fb_display[currcon].var, 1, controlfb_getcolreg,
+			    info);
+	currcon = con;
+#if 0
+	control_var_to_par(&fb_display[currcon].var, &par, info);
+	control_set_par(&par, info); /*STOPPEDHERE - did i define that? */
+	do_install_cmap(con, info);
+#else
+	/* I see no reason not to do this.  Minus info->changevar(). */
+	/* DOH.  This makes control_set_var compare, you guessed it, */
+	/* fb_display[con].var (first param), and fb_display[con].var! */
+	/* Perhaps I just fixed that... */
+	switching = 1;
+	control_set_var(&fb_display[con].var, con, info);
+	switching = 0;
+#endif
+	return 0;
+}
+
+static int controlfb_updatevar(int con, struct fb_info *info)
+{
+	return 0;
+}
+
+static void controlfb_blank(int blank_mode, struct fb_info *info)
+{
+/*
+ *  Blank the screen if blank_mode != 0, else unblank. If blank == NULL
+ *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
+ *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
+ *  to e.g. a video mode which doesn't support it. Implements VESA suspend
+ *  and powerdown modes on hardware that supports disabling hsync/vsync:
+ *    blank_mode == 2: suspend vsync
+ *    blank_mode == 3: suspend hsync
+ *    blank_mode == 4: powerdown
+ */
+/* [danj] I think there's something fishy about those constants... */
+	struct fb_info_control *p = (struct fb_info_control *) info;
+	int	ctrl;
+
+	ctrl = ld_le32(&p->control_regs->ctrl.r) | 0x33;
+	if (blank_mode)
+		--blank_mode;
+	if (blank_mode & VESA_VSYNC_SUSPEND)
+		ctrl &= ~3;
+	if (blank_mode & VESA_HSYNC_SUSPEND)
+		ctrl &= ~0x30;
+	out_le32(&p->control_regs->ctrl.r, ctrl);
+
+/* TODO: Figure out how the heck to powerdown this thing! */
+
+    return;
+}
+
+static int controlfb_getcolreg(u_int regno, u_int *red, u_int *green,
+			     u_int *blue, u_int *transp, struct fb_info *info)
+{
+	struct fb_info_control *p = (struct fb_info_control *) info;
+
+	if (regno > 255)
+		return 1;
+	*red = p->palette[regno].red;
+	*green = p->palette[regno].green;
+	*blue = p->palette[regno].blue;
+	return 0;
+}
+
+static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			     u_int transp, struct fb_info *info)
+{
+	struct fb_info_control *p = (struct fb_info_control *) info;
+
+	if (regno > 255 || regno < 0)
+		return 1;
+	p->palette[regno].red = red;
+	p->palette[regno].green = green;
+	p->palette[regno].blue = blue;
+
+	out_8(&p->cmap_regs->addr, regno);	/* tell clut what addr to fill	*/
+	out_8(&p->cmap_regs->lut, red);		/* send one color channel at	*/
+	out_8(&p->cmap_regs->lut, green);	/* a time...			*/
+	out_8(&p->cmap_regs->lut, blue);
+
+	if(regno < 16) {
+#if 0
+#ifdef FBCON_HAS_CFB16
+		fbcon_cfb16_cmap[regno] = (red << 10) | (green << 5) | blue;
+#endif
+#ifdef FBCON_HAS_CFB32
+		fbcon_cfb32_cmap[regno] = (red << 16) | (green << 8) | blue;
+		/* I think. */
+#endif
+#else
+#ifdef FBCON_HAS_CFB16
+		fbcon_cfb16_cmap[regno] = (regno << 10) | (regno << 5) | regno;
+#endif
+#ifdef FBCON_HAS_CFB32
+		fbcon_cfb32_cmap[regno] = (regno << 24) | (regno << 16) | (regno << 8) | regno;
+		/* I think. */
+#endif
+#endif
+	}
+	return 0;
+}
+
+static void do_install_cmap(int con, struct fb_info *info)
+{
+	if (con != currcon)
+		return;
+	if (fb_display[con].cmap.len)
+		fb_set_cmap(&fb_display[con].cmap, &fb_display[con].var, 1,
+			    controlfb_setcolreg, info);
+	else {
+		int size = fb_display[con].var.bits_per_pixel == 16 ? 32 : 256;
+		fb_set_cmap(fb_default_cmap(size), &fb_display[con].var, 1,
+			    controlfb_setcolreg, info);
+	}
+}
+
+#ifdef CONFIG_FB_COMPAT_XPMAC
+extern struct vc_mode display_info;
+extern struct fb_info *console_fb_info;
+#if 0
+extern int (*console_setmode_ptr)(struct vc_mode *, int);
+extern int (*console_set_cmap_ptr)(struct fb_cmap *, int, int,
+				   struct fb_info *);
+int console_setmode(struct vc_mode *, int);
+#endif
+#endif /* CONFIG_FB_COMPAT_XPMAC */
+
+static inline int control_vram_reqd(int video_mode, int color_mode)
+{
+	return control_reg_init[video_mode-1]->vres
+		* control_reg_init[video_mode-1]->pitch[color_mode];
+}
+
+static void set_control_clock(unsigned char *params)
+{
+	struct adb_request req;
+	int i;
+
+	for (i = 0; i < 3; ++i) {
+		cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
+			     0x50, i + 1, params[i]);
+		while (!req.complete)
+			cuda_poll();
+	}
+}
+
+
+__initfunc(static void init_control(struct fb_info_control *p))
+{
+	struct fb_par_control *par = &p->par;
+
+	p->sense = read_control_sense(p);
+	printk("Monitor sense value = 0x%x, ", p->sense);
+	/* Try to pick a video mode out of NVRAM if we have one. */
+	par->vmode = nvram_read_byte(NV_VMODE);
+	if(par->vmode <= 0 || par->vmode > VMODE_MAX || !control_reg_init[par->vmode - 1])
+		par->vmode = VMODE_CHOOSE;
+	if(par->vmode == VMODE_CHOOSE)
+		par->vmode = mac_map_monitor_sense(p->sense);
+	if(!control_reg_init[par->vmode - 1])
+		par->vmode = VMODE_640_480_60;
+
+	par->cmode = nvram_read_byte(NV_CMODE);
+	if(par->cmode < CMODE_8 || par->cmode > CMODE_32)
+		par->cmode = CMODE_8;
+	/*
+	 * Reduce the pixel size if we don't have enough VRAM.
+	 */
+	while(par->cmode > CMODE_8 && control_vram_reqd(par->vmode, par->cmode) > p->total_vram)
+		par->cmode--;
+	
+	printk("using video mode %d and color mode %d.\n", par->vmode, par->cmode);
+	
+	par->vxres = par->xres = control_reg_init[par->vmode - 1]->hres;
+	par->vyres = par->yres = control_reg_init[par->vmode - 1]->vres;
+	par->xoffset = par->yoffset = 0;
+	
+	control_par_to_all(p, 1);
+	
+	if (register_framebuffer(&p->info) < 0) {
+		kfree(p);
+		return;
+	}
+	control_set_hardware(p);
+	
+	printk("fb%d: control display adapter\n", GET_FB_IDX(p->info.node));	
+}
+
+/* Now how about actually saying, Make it so! */
+/* Some things in here probably don't need to be done each time. */
+static void control_set_hardware(struct fb_info_control *p)
+{
+	struct control_regvals	*init;
+	struct preg		*rp;
+	int			flags, ctrl, i;
+	int			vmode, cmode;
+	
+	vmode = p->par.vmode;
+	cmode = p->par.cmode;
+	
+	init = control_reg_init[vmode - 1];
+	
+	if (control_vram_reqd(vmode, cmode) > 0x200000)
+		flags = 0x51;
+	else if (p->control_use_bank2)
+		flags = 0x39;
+	else
+		flags = 0x31;
+	if (vmode >= VMODE_1280_960_75 && cmode >= CMODE_16)
+		ctrl = 0x7f;
+	else
+		ctrl = 0x3b;
+
+	/* Initialize display timing registers */
+	out_le32(&p->control_regs->ctrl.r, 0x43b);
+	
+	set_control_clock(init->clock_params);
+	
+	p->cmap_regs->addr = 0x20; p->cmap_regs->d2 = init->radacal_ctrl[cmode];
+	p->cmap_regs->addr = 0x21; p->cmap_regs->d2 = p->control_use_bank2 ? 0: 1;
+	p->cmap_regs->addr = 0x10; p->cmap_regs->d2 = 0;
+	p->cmap_regs->addr = 0x11; p->cmap_regs->d2 = 0;
+
+	rp = &p->control_regs->vswin;
+	for (i = 0; i < 16; ++i, ++rp)
+		out_le32(&rp->r, init->regs[i]);
+	
+	out_le32(&p->control_regs->pitch.r, init->pitch[cmode]);
+	out_le32(&p->control_regs->mode.r, init->mode[cmode]);
+	out_le32(&p->control_regs->flags.r, flags);
+	out_le32(&p->control_regs->start_addr.r, 0);
+	out_le32(&p->control_regs->reg18.r, 0x1e5);
+	out_le32(&p->control_regs->reg19.r, 0);
+
+	for (i = 0; i < 16; ++i) {
+		controlfb_setcolreg(color_table[i], default_red[i], default_grn[i],
+			default_blu[i], 0, (struct fb_info *)p);
+	}
+/* Does the above need to be here each time? -- danj */
+
+	/* Turn on display */
+	out_le32(&p->control_regs->ctrl.r, ctrl);
+	
+#ifdef CONFIG_FB_COMPAT_XPMAC
+	/* And let the world know the truth. */
+	if (!console_fb_info || console_fb_info == &p->info) {
+		display_info.height = p->var.yres;
+		display_info.width = p->var.xres;
+		display_info.depth = (cmode == CMODE_32) ? 32 :
+			((cmode == CMODE_16) ? 16 : 8);
+		display_info.pitch = p->fix.line_length;
+		display_info.mode = vmode;
+		strncpy(display_info.name, "control",
+			sizeof(display_info.name));
+		display_info.fb_address = p->frame_buffer_phys
+			 + control_reg_init[vmode-1]->offset[cmode];
+		display_info.cmap_adr_address = p->cmap_regs_phys;
+		display_info.cmap_data_address = p->cmap_regs_phys + 0x30;
+		display_info.disp_reg_address = p->control_regs_phys;
+		console_fb_info = &p->info;
+	}
+#endif /* CONFIG_FB_COMPAT_XPMAC */
+}
+
+__initfunc(void control_init(void))
+{
+#ifndef CONFIG_FB_OF
+	struct device_node *dp;
+
+	dp = find_devices("control");
+	if (dp != 0)
+		control_of_init(dp);
+#endif /* CONFIG_FB_OF */
+}
+
+__initfunc(void control_of_init(struct device_node *dp))
+{
+	struct fb_info_control	*p;
+	unsigned long		addr, size;
+	int			i, bank1, bank2;
+	
+	if(dp->next != 0)
+		printk("Warning: only using first control display device.\n");
+		/* danj: I have a feeling this no longer applies - if we somehow *
+		 * had two of them, they'd be two framebuffers, right?           */
+	if(dp->n_addrs != 2)
+		panic("expecting 2 address for control (got %d)", dp->n_addrs);
+	p = kmalloc(sizeof(*p), GFP_ATOMIC);
+	if (p == 0)
+		return;
+
+	/* Map in frame buffer and registers */
+	for (i = 0; i < dp->n_addrs; ++i) {
+		addr = dp->addrs[i].address;
+		size = dp->addrs[i].size;
+		if (size >= 0x800000) {
+			/* use the big-endian aperture (??) */
+			addr += 0x800000;
+			/* map at most 8MB for the frame buffer */
+			p->frame_buffer_phys = addr;
+			p->frame_buffer = __ioremap(addr, 0x800000, _PAGE_WRITETHRU);
+		} else {
+			p->control_regs_phys = addr;
+			p->control_regs = ioremap(addr, size);
+		}
+	}
+	p->cmap_regs_phys = 0xf301b000;	 /* XXX not in prom? */
+	p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
+
+	/* Work out which banks of VRAM we have installed. */
+	/* danj: I guess the card just ignores writes to nonexistant VRAM... */
+	p->frame_buffer[0] = 0x5a;
+	p->frame_buffer[1] = 0xc7;
+	bank1 = p->frame_buffer[0] == 0x5a && p->frame_buffer[1] == 0xc7;
+	p->frame_buffer[0x600000] = 0xa5;
+	p->frame_buffer[0x600001] = 0x38;
+	bank2 = p->frame_buffer[0x600000] == 0xa5 && p->frame_buffer[0x600001] == 0x38;
+	p->total_vram = (bank1 + bank2) * 0x200000;
+	/* If we don't have bank 1 installed, we hope we have bank 2 :-) */
+	p->control_use_bank2 = !bank1;
+	if (p->control_use_bank2)
+		p->frame_buffer += 0x600000;
+
+#ifdef CONFIG_FB_COMPAT_XPMAC
+#if 0
+	console_set_cmap_ptr = control_set_cmap;
+	console_setmode_ptr = control_console_setmode;
+#endif
+#endif /* CONFIG_FB_COMPAT_XPMAC */
+
+	init_control(p);
+}
+
+/*
+ * Get the monitor sense value.
+ * Note that this can be called before calibrate_delay,
+ * so we can't use udelay.
+ *
+ * Hmm - looking at platinum, should we be calling eieio() here?
+ */
+static int read_control_sense(struct fb_info_control *p)
+{
+	int sense;
+
+	out_le32(&p->control_regs->mon_sense.r, 7);	/* drive all lines high */
+	__delay(200);
+	out_le32(&p->control_regs->mon_sense.r, 077);	/* turn off drivers */
+	__delay(2000);
+	sense = (in_le32(&p->control_regs->mon_sense.r) & 0x1c0) << 2;
+
+	/* drive each sense line low in turn and collect the other 2 */
+	out_le32(&p->control_regs->mon_sense.r, 033);	/* drive A low */
+	__delay(2000);
+	sense |= (in_le32(&p->control_regs->mon_sense.r) & 0xc0) >> 2;
+	out_le32(&p->control_regs->mon_sense.r, 055);	/* drive B low */
+	__delay(2000);
+	sense |= ((in_le32(&p->control_regs->mon_sense.r) & 0x100) >> 5)
+		| ((in_le32(&p->control_regs->mon_sense.r) & 0x40) >> 4);
+	out_le32(&p->control_regs->mon_sense.r, 066);	/* drive C low */
+	__delay(2000);
+	sense |= (in_le32(&p->control_regs->mon_sense.r) & 0x180) >> 7;
+
+	out_le32(&p->control_regs->mon_sense.r, 077);	/* turn off drivers */
+	
+	return sense;
+}
+
+#if 1
+/* This routine takes a user-supplied var, and picks the best vmode/cmode from it. */
+static int control_var_to_par(struct fb_var_screeninfo *var, 
+	struct fb_par_control *par, const struct fb_info *fb_info)
+{
+	int xres = var->xres;
+	int yres = var->yres;
+	int bpp = var->bits_per_pixel;
+	
+	struct control_regvals *init;
+	struct fb_info_control *p = (struct fb_info_control *) fb_info;
+
+    /*
+     *  Get the video params out of 'var'. If a value doesn't fit, round it up,
+     *  if it's too big, return -EINVAL.
+     *
+     *  Suggestion: Round up in the following order: bits_per_pixel, xres,
+     *  yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
+     *  bitfields, horizontal timing, vertical timing.
+     */
+	/* swiped by jonh from atyfb.c */
+	if (xres <= 512 && yres <= 384)
+		par->vmode = VMODE_512_384_60;		 /* 512x384, 60Hz */
+	else if (xres <= 640 && yres <= 480)
+		par->vmode = VMODE_640_480_67;		/* 640x480, 67Hz */
+	else if (xres <= 640 && yres <= 870)
+		par->vmode = VMODE_640_870_75P;		/* 640x870, 75Hz (portrait) */
+	else if (xres <= 768 && yres <= 576)
+		par->vmode = VMODE_768_576_50I;		/* 768x576, 50Hz (PAL full frame) */
+	else if (xres <= 800 && yres <= 600)
+		par->vmode = VMODE_800_600_75;		/* 800x600, 75Hz */
+	else if (xres <= 832 && yres <= 624)
+		par->vmode = VMODE_832_624_75;		/* 832x624, 75Hz */
+	else if (xres <= 1024 && yres <= 768)
+		par->vmode = VMODE_1024_768_75;		/* 1024x768, 75Hz */
+	else if (xres <= 1152 && yres <= 870)
+		par->vmode = VMODE_1152_870_75;		/* 1152x870, 75Hz */
+	else if (xres <= 1280 && yres <= 960)
+		par->vmode = VMODE_1280_960_75;		/* 1280x960, 75Hz */
+	else if (xres <= 1280 && yres <= 1024)
+		par->vmode = VMODE_1280_1024_75;	/* 1280x1024, 75Hz */
+	else
+		return -EINVAL;
+
+	xres = control_reg_init[par->vmode-1]->hres;
+	yres = control_reg_init[par->vmode-1]->vres;
+
+/*
+	if (var->xres_virtual <= xres)
+		par->vxres = xres;
+	else
+		par->vxres = (var->xres_virtual+7) & ~7;
+	if (var->yres_virtual <= yres)
+		par->vyres = yres;
+	else
+		par->vyres = var->yres_virtual;
+
+	par->xoffset = (var->xoffset+7) & ~7;
+	par->yoffset = var->yoffset;
+	if (par->xoffset+xres > par->vxres || par->yoffset+yres > par->vyres)
+		return -EINVAL;
+*/
+
+	/* I'm too chicken to think about virtual	*/
+	/* resolutions just yet. Bok bok.			*/
+	
+	/* And I'm too chicken to even figure out what they are.  Awk awk. [danj] */
+	if (var->xres_virtual > xres || var->yres_virtual > yres
+		|| var->xoffset != 0 || var->yoffset != 0) {
+		return -EINVAL;
+	}
+
+	par->xres = xres;
+	par->yres = yres;
+	par->vxres = xres;
+	par->vyres = yres;
+	par->xoffset = 0;
+	par->yoffset = 0;
+
+	if (bpp <= 8)
+		par->cmode = CMODE_8;
+	else if (bpp <= 16)
+		par->cmode = CMODE_16;
+	else if (bpp <= 32)
+		par->cmode = CMODE_32;
+	else
+		return -EINVAL;
+
+	if (control_vram_reqd(par->vmode, par->cmode) > p->total_vram)
+		return -EINVAL;
+
+	/* Check if we know about the wanted video mode */
+	init = control_reg_init[par->vmode-1];
+	if (init == NULL) {
+		/* I'm not sure if control has any specific requirements --	*/
+		/* if we have a regvals struct, we're good to go?		*/
+		return -EINVAL;
+	}
+
+	return 0;
+}
+#else
+/* This routine takes a user-supplied var, and picks the best vmode/cmode from it. */
+static int control_var_to_par(struct fb_var_screeninfo *var, 
+	struct fb_par_control *par, const struct fb_info *fb_info)
+{
+	struct fb_info_control *p = (struct fb_info_control *) fb_info;
+	
+	if(mac_var_to_vmode(var, &par->vmode, &par->cmode) != 0)
+		return -EINVAL;
+	par->xres = par->vxres = vmode_attrs[par->vmode - 1].hres;
+	par->yres = par->vyres = vmode_attrs[par->vmode - 1].vres;
+	par->xoffset = par->yoffset = 0;
+	
+	if (control_vram_reqd(par->vmode, par->cmode) > p->total_vram)
+		return -EINVAL;
+
+	/* Check if we know about the wanted video mode */
+	if(!control_reg_init[par->vmode-1]) {
+		/* I'm not sure if control has any specific requirements --	*/
+		/* if we have a regvals struct, we're good to go?		*/
+		return -EINVAL;
+	}
+	return 0;
+}
+#endif
+
+#if 1
+static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
+{
+	memset(var, 0, sizeof(*var));
+	var->xres = control_reg_init[par->vmode - 1]->hres;
+	var->yres = control_reg_init[par->vmode - 1]->vres;
+	var->xres_virtual = var->xres;
+	var->yres_virtual = var->yres;	/* For now. */
+	var->xoffset = par->xoffset;
+	var->yoffset = par->yoffset;
+	var->grayscale = 0;
+	
+	if(par->cmode != CMODE_8 && par->cmode != CMODE_16 && par->cmode != CMODE_32) {
+		printk(KERN_ERR "Bad color mode in control_par_to_var()!\n");
+		par->cmode = CMODE_8;
+	}
+	switch(par->cmode) {
+	case CMODE_8:
+		var->bits_per_pixel = 8;
+		var->red.offset = 0;
+		var->red.length = 8;
+		var->green.offset = 0;
+		var->green.length = 8;
+		var->blue.offset = 0;
+		var->blue.length = 8;
+		var->transp.offset = 0;
+		var->transp.length = 0;
+		break;
+	case CMODE_16:	/* RGB 555 */
+		var->bits_per_pixel = 16;
+		var->red.offset = 10;
+		var->red.length = 5;
+		var->green.offset = 5;
+		var->green.length = 5;
+		var->blue.offset = 0;
+		var->blue.length = 5;
+		var->transp.offset = 0;
+		var->transp.length = 0;
+		break;
+	case CMODE_32:	/* RGB 888 */
+		var->bits_per_pixel = 32;
+		var->red.offset = 16;
+		var->red.length = 8;
+		var->green.offset = 8;
+		var->green.length = 8;
+		var->blue.offset = 0;
+		var->blue.length = 8;
+		var->transp.offset = 24;
+		var->transp.length = 8;
+		break;
+	}
+	var->red.msb_right = 0;
+	var->green.msb_right = 0;
+	var->blue.msb_right = 0;
+	var->transp.msb_right = 0;
+	var->nonstd = 0;
+	var->activate = 0;
+	var->height = -1;
+	var->width = -1;
+	var->vmode = FB_VMODE_NONINTERLACED;
+
+	/* these are total guesses, copied right out of atyfb.c */
+	var->left_margin = var->right_margin = 64;
+	var->upper_margin = var->lower_margin = 32;
+	var->hsync_len = /*64*/8;
+	var->vsync_len = /*2*/8;
+	var->sync = 0;
+
+#if 0
+/* jonh's pixclocks...*/
+	/* no long long support in the kernel :-( */
+	/* this splittig trick will work if xres > 232 */
+	var->pixclock = 1000000000/
+	(var->left_margin+var->xres+var->right_margin+var->hsync_len);
+	var->pixclock *= 1000;
+	var->pixclock /= vmode_attrs[par->vmode-1].vfreq*
+	 (var->upper_margin+var->yres+var->lower_margin+var->vsync_len);
+#else
+/* danj's */
+	/* 10^12 * clock_params[0] / (3906400 * clock_params[1] * 2^clock_params[2]) */
+	/* (10^12 * clock_params[0] / (3906400 * clock_params[1])) >> clock_params[2] */
+	/* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
+	var->pixclock = 255990 * control_reg_init[par->vmode-1]->clock_params[0];
+	var->pixclock /= control_reg_init[par->vmode-1]->clock_params[1];
+	var->pixclock >>= control_reg_init[par->vmode-1]->clock_params[2];
+#endif
+}
+#else
+static inline void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
+{
+	mac_vmode_to_var(par->vmode, par->cmode, var);
+}
+#endif
+
+static void control_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_control *p)
+{
+	memset(fix, 0, sizeof(*fix));
+	strcpy(fix->id, "control");
+	fix->mmio_start = (char *)p->control_regs_phys;
+	fix->mmio_len = sizeof(struct control_regs);
+	fix->type = FB_TYPE_PACKED_PIXELS;
+	
+	/*
+		fix->type_aux = 0;
+		fix->ywrapstep = 0;
+		fix->ypanstep = 0;
+		fix->xpanstep = 0;
+	*/
+}
+
+/* Fix must already be inited ^^^^^^^ */
+static void control_par_to_fix(struct fb_par_control *par, struct fb_fix_screeninfo *fix,
+	struct fb_info_control *p)
+{
+	fix->smem_start = (void *)(p->frame_buffer_phys
+		+ control_reg_init[par->vmode-1]->offset[par->cmode]);
+	p->fix.smem_len = control_vram_reqd(par->vmode, par->cmode);
+		/* Hmm, jonh used total_vram here. */
+	p->fix.visual = (par->cmode == CMODE_8) ?
+		FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
+	p->fix.line_length = par->vxres << par->cmode;
+		/* ywrapstep, xpanstep, ypanstep */
+}
+
+static void control_init_display(struct display *disp)
+{
+	memset(disp, 0, sizeof(*disp));
+	disp->type = /* fix->type */ FB_TYPE_PACKED_PIXELS;
+	disp->can_soft_blank = 1;
+	disp->scrollmode = SCROLL_YREDRAW;
+#if 0
+		disp->type_aux = fix->type_aux;
+		disp->cmap.red = NULL;	/* ??? danj */
+		disp->cmap.green = NULL;
+		disp->cmap.blue = NULL;
+		disp->cmap.transp = NULL;
+			/* Yeah, I realize I just set 0 = 0. */
+#endif
+}
+
+static void control_par_to_display(struct fb_par_control *par,
+  struct display *disp, struct fb_fix_screeninfo *fix, struct fb_info_control *p)
+{
+	disp->var = p->var;
+	disp->screen_base = (char *) p->frame_buffer
+		 + control_reg_init[par->vmode-1]->offset[par->cmode];
+	disp->visual = fix->visual;
+	disp->line_length = fix->line_length;
+
+if(disp->scrollmode != SCROLL_YREDRAW) {
+	printk(KERN_ERR "Scroll mode not YREDRAW in control_par_to_display!!\n");
+	disp->scrollmode = SCROLL_YREDRAW;
+}
+	disp->dispsw = (par->cmode == CMODE_32) ? &fbcon_cfb32 :
+		((par->cmode == CMODE_16) ? &fbcon_cfb16 : &fbcon_cfb8);
+}
+
+static void control_init_info(struct fb_info *info, struct fb_info_control *p)
+{
+	strcpy(info->modename, p->fix.id);
+	info->node = -1;	/* ??? danj */
+	info->fbops = &controlfb_ops;
+	info->disp = &p->disp;
+	info->fontname[0] = 0;
+	info->changevar = NULL;
+	info->switch_con = &controlfb_switch;
+	info->updatevar = &controlfb_updatevar;
+	info->blank = &controlfb_blank;
+}
+
+/* danj: Oh, I HOPE I didn't miss anything major in here... */
+static void control_par_to_all(struct fb_info_control *p, int init)
+{
+	if(init) {
+		control_init_fix(&p->fix, p);
+	}
+	control_par_to_fix(&p->par, &p->fix, p);
+
+	control_par_to_var(&p->par, &p->var);
+
+	if(init) {
+		control_init_display(&p->disp);
+	}
+	control_par_to_display(&p->par, &p->disp, &p->fix, p);
+	
+	if(init) {
+		control_init_info(&p->info, p);
+	}
+}
+
+#if 0
+__initfunc(void controlfb_setup(char *options, int *ints))
+{
+    /* Parse user speficied options (`video=controlfb:') */
+	FUNCID;
+}
+
+static int controlfb_pan_display(struct fb_var_screeninfo *var,
+			   struct controlfb_par *par,
+			   const struct fb_info *fb_info)
+{
+    /*
+     *  Pan (or wrap, depending on the `vmode' field) the display using the
+     *  `xoffset' and `yoffset' fields of the `var' structure.
+     *  If the values don't fit, return -EINVAL.
+     */
+
+	FUNCID;
+
+    return 0;
+}
+
+#endif