Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 3098 insertions, 0 deletions

diff --git a/drivers/video/atafb.c b/drivers/video/atafb.c
new file mode 100644
index 000000000000..15ec1295bc29
--- /dev/null
+++ b/drivers/video/atafb.c
@@ -0,0 +1,3098 @@
+/*
+ * linux/drivers/video/atafb.c -- Atari builtin chipset frame buffer device
+ *
+ *  Copyright (C) 1994 Martin Schaller & Roman Hodek
+ *  
+ * 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.
+ *
+ * History:
+ *   - 03 Jan 95: Original version by Martin Schaller: The TT driver and
+ *                all the device independent stuff
+ *   - 09 Jan 95: Roman: I've added the hardware abstraction (hw_switch)
+ *                and wrote the Falcon, ST(E), and External drivers
+ *                based on the original TT driver.
+ *   - 07 May 95: Martin: Added colormap operations for the external driver
+ *   - 21 May 95: Martin: Added support for overscan
+ *		  Andreas: some bug fixes for this
+ *   -    Jul 95: Guenther Kelleter <guenther@pool.informatik.rwth-aachen.de>:
+ *                Programmable Falcon video modes
+ *                (thanks to Christian Cartus for documentation
+ *                of VIDEL registers).
+ *   - 27 Dec 95: Guenther: Implemented user definable video modes "user[0-7]"
+ *                on minor 24...31. "user0" may be set on commandline by
+ *                "R<x>;<y>;<depth>". (Makes sense only on Falcon)
+ *                Video mode switch on Falcon now done at next VBL interrupt
+ *                to avoid the annoying right shift of the screen.
+ *   - 23 Sep 97: Juergen: added xres_virtual for cards like ProMST
+ *                The external-part is legacy, therefore hardware-specific
+ *                functions like panning/hardwarescrolling/blanking isn't
+ *				  supported.
+ *   - 29 Sep 97: Juergen: added Romans suggestion for pan_display
+ *				  (var->xoffset was changed even if no set_screen_base avail.)
+ *	 - 05 Oct 97: Juergen: extfb (PACKED_PIXEL) is FB_PSEUDOCOLOR 'cause
+ *				  we know how to set the colors
+ *				  ext_*palette: read from ext_colors (former MV300_colors)
+ *							    write to ext_colors and RAMDAC
+ *
+ * To do:
+ *   - For the Falcon it is not possible to set random video modes on
+ *     SM124 and SC/TV, only the bootup resolution is supported.
+ *
+ */
+
+#define ATAFB_TT
+#define ATAFB_STE
+#define ATAFB_EXT
+#define ATAFB_FALCON
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.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/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/setup.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include <asm/atarihw.h>
+#include <asm/atariints.h>
+#include <asm/atari_stram.h>
+
+#include <linux/fb.h>
+#include <asm/atarikb.h>
+
+#include <video/fbcon.h>
+#include <video/fbcon-cfb8.h>
+#include <video/fbcon-cfb16.h>
+#include <video/fbcon-iplan2p2.h>
+#include <video/fbcon-iplan2p4.h>
+#include <video/fbcon-iplan2p8.h>
+#include <video/fbcon-mfb.h>
+
+
+#define SWITCH_ACIA 0x01		/* modes for switch on OverScan */
+#define SWITCH_SND6 0x40
+#define SWITCH_SND7 0x80
+#define SWITCH_NONE 0x00
+
+
+#define up(x, r) (((x) + (r) - 1) & ~((r)-1))
+
+
+static int default_par=0;	/* default resolution (0=none) */
+
+static unsigned long default_mem_req=0;
+
+static int hwscroll=-1;
+
+static int use_hwscroll = 1;
+
+static int sttt_xres=640,st_yres=400,tt_yres=480;
+static int sttt_xres_virtual=640,sttt_yres_virtual=400;
+static int ovsc_offset=0, ovsc_addlen=0;
+
+static struct atafb_par {
+	void *screen_base;
+	int yres_virtual;
+#if defined ATAFB_TT || defined ATAFB_STE
+	union {
+		struct {
+			int mode;
+			int sync;
+		} tt, st;
+#endif
+#ifdef ATAFB_FALCON
+		struct falcon_hw {
+			/* Here are fields for storing a video mode, as direct
+			 * parameters for the hardware.
+			 */
+			short sync;
+			short line_width;
+			short line_offset;
+			short st_shift;
+			short f_shift;
+			short vid_control;
+			short vid_mode;
+			short xoffset;
+			short hht, hbb, hbe, hdb, hde, hss;
+			short vft, vbb, vbe, vdb, vde, vss;
+			/* auxiliary information */
+			short mono;
+			short ste_mode;
+			short bpp;
+		} falcon;
+#endif
+		/* Nothing needed for external mode */
+	} hw;
+} current_par;
+
+/* Don't calculate an own resolution, and thus don't change the one found when
+ * booting (currently used for the Falcon to keep settings for internal video
+ * hardware extensions (e.g. ScreenBlaster)  */
+static int DontCalcRes = 0; 
+
+#ifdef ATAFB_FALCON
+#define HHT hw.falcon.hht
+#define HBB hw.falcon.hbb
+#define HBE hw.falcon.hbe
+#define HDB hw.falcon.hdb
+#define HDE hw.falcon.hde
+#define HSS hw.falcon.hss
+#define VFT hw.falcon.vft
+#define VBB hw.falcon.vbb
+#define VBE hw.falcon.vbe
+#define VDB hw.falcon.vdb
+#define VDE hw.falcon.vde
+#define VSS hw.falcon.vss
+#define VCO_CLOCK25		0x04
+#define VCO_CSYPOS		0x10
+#define VCO_VSYPOS		0x20
+#define VCO_HSYPOS		0x40
+#define VCO_SHORTOFFS	0x100
+#define VMO_DOUBLE		0x01
+#define VMO_INTER		0x02
+#define VMO_PREMASK		0x0c
+#endif
+
+static struct fb_info fb_info;
+
+static void *screen_base;	/* base address of screen */
+static void *real_screen_base;	/* (only for Overscan) */
+
+static int screen_len;
+
+static int current_par_valid=0; 
+
+static int mono_moni=0;
+
+static struct display disp;
+
+
+#ifdef ATAFB_EXT
+/* external video handling */
+
+static unsigned			external_xres;
+static unsigned			external_xres_virtual;
+static unsigned			external_yres;
+/* not needed - atafb will never support panning/hardwarescroll with external
+ * static unsigned		external_yres_virtual;	
+*/
+
+static unsigned			external_depth;
+static int				external_pmode;
+static void *external_addr = 0;
+static unsigned long	external_len;
+static unsigned long	external_vgaiobase = 0;
+static unsigned int		external_bitspercol = 6;
+
+/* 
+JOE <joe@amber.dinoco.de>: 
+added card type for external driver, is only needed for
+colormap handling.
+*/
+
+enum cardtype { IS_VGA, IS_MV300 };
+static enum cardtype external_card_type = IS_VGA;
+
+/*
+The MV300 mixes the color registers. So we need an array of munged
+indices in order to access the correct reg.
+*/
+static int MV300_reg_1bit[2]={0,1};
+static int MV300_reg_4bit[16]={
+0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15 };
+static int MV300_reg_8bit[256]={
+0, 128, 64, 192, 32, 160, 96, 224, 16, 144, 80, 208, 48, 176, 112, 240, 
+8, 136, 72, 200, 40, 168, 104, 232, 24, 152, 88, 216, 56, 184, 120, 248, 
+4, 132, 68, 196, 36, 164, 100, 228, 20, 148, 84, 212, 52, 180, 116, 244, 
+12, 140, 76, 204, 44, 172, 108, 236, 28, 156, 92, 220, 60, 188, 124, 252, 
+2, 130, 66, 194, 34, 162, 98, 226, 18, 146, 82, 210, 50, 178, 114, 242, 
+10, 138, 74, 202, 42, 170, 106, 234, 26, 154, 90, 218, 58, 186, 122, 250, 
+6, 134, 70, 198, 38, 166, 102, 230, 22, 150, 86, 214, 54, 182, 118, 246, 
+14, 142, 78, 206, 46, 174, 110, 238, 30, 158, 94, 222, 62, 190, 126, 254, 
+1, 129, 65, 193, 33, 161, 97, 225, 17, 145, 81, 209, 49, 177, 113, 241, 
+9, 137, 73, 201, 41, 169, 105, 233, 25, 153, 89, 217, 57, 185, 121, 249, 
+5, 133, 69, 197, 37, 165, 101, 229, 21, 149, 85, 213, 53, 181, 117, 245, 
+13, 141, 77, 205, 45, 173, 109, 237, 29, 157, 93, 221, 61, 189, 125, 253, 
+3, 131, 67, 195, 35, 163, 99, 227, 19, 147, 83, 211, 51, 179, 115, 243, 
+11, 139, 75, 203, 43, 171, 107, 235, 27, 155, 91, 219, 59, 187, 123, 251, 
+7, 135, 71, 199, 39, 167, 103, 231, 23, 151, 87, 215, 55, 183, 119, 247, 
+15, 143, 79, 207, 47, 175, 111, 239, 31, 159, 95, 223, 63, 191, 127, 255 }; 
+
+static int *MV300_reg = MV300_reg_8bit;
+
+/*
+And on the MV300 it's difficult to read out the hardware palette. So we
+just keep track of the set colors in our own array here, and use that!
+*/
+
+static struct { unsigned char red,green,blue,pad; } ext_color[256];
+#endif /* ATAFB_EXT */
+
+
+static int inverse=0;
+
+extern int fontheight_8x8;
+extern int fontwidth_8x8;
+extern unsigned char fontdata_8x8[];
+
+extern int fontheight_8x16;
+extern int fontwidth_8x16;
+extern unsigned char fontdata_8x16[];
+
+/* ++roman: This structure abstracts from the underlying hardware (ST(e),
+ * TT, or Falcon.
+ *
+ * int (*detect)( void )
+ *   This function should detect the current video mode settings and
+ *   store them in atafb_predefined[0] for later reference by the
+ *   user. Return the index+1 of an equivalent predefined mode or 0
+ *   if there is no such.
+ * 
+ * int (*encode_fix)( struct fb_fix_screeninfo *fix,
+ *                    struct atafb_par *par )
+ *   This function should fill in the 'fix' structure based on the
+ *   values in the 'par' structure.
+ *   
+ * int (*decode_var)( struct fb_var_screeninfo *var,
+ *                    struct atafb_par *par )
+ *   Get the video params out of 'var'. If a value doesn't fit, round
+ *   it up, if it's too big, return EINVAL.
+ *   Round up in the following order: bits_per_pixel, xres, yres, 
+ *   xres_virtual, yres_virtual, xoffset, yoffset, grayscale, bitfields, 
+ *   horizontal timing, vertical timing.
+ *
+ * int (*encode_var)( struct fb_var_screeninfo *var,
+ *                    struct atafb_par *par );
+ *   Fill the 'var' structure based on the values in 'par' and maybe
+ *   other values read out of the hardware.
+ *   
+ * void (*get_par)( struct atafb_par *par )
+ *   Fill the hardware's 'par' structure.
+ *   
+ * void (*set_par)( struct atafb_par *par )
+ *   Set the hardware according to 'par'.
+ *   
+ * int (*getcolreg)( unsigned regno, unsigned *red,
+ *                   unsigned *green, unsigned *blue,
+ *                   unsigned *transp, struct fb_info *info )
+ *   Read a single color register and split it into
+ *   colors/transparent. Return != 0 for invalid regno.
+ *
+ * void (*set_screen_base)(void *s_base)
+ *   Set the base address of the displayed frame buffer. Only called
+ *   if yres_virtual > yres or xres_virtual > xres.
+ *
+ * int (*blank)( int blank_mode )
+ *   Blank the screen if blank_mode!=0, else unblank. If blank==NULL then
+ *   the caller blanks by setting the CLUT 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, 3:suspend hsync, 4: powerdown.
+ */
+
+static struct fb_hwswitch {
+	int  (*detect)( void );
+	int  (*encode_fix)( struct fb_fix_screeninfo *fix,
+						struct atafb_par *par );
+	int  (*decode_var)( struct fb_var_screeninfo *var,
+						struct atafb_par *par );
+	int  (*encode_var)( struct fb_var_screeninfo *var,
+						struct atafb_par *par );
+	void (*get_par)( struct atafb_par *par );
+	void (*set_par)( struct atafb_par *par );
+	int  (*getcolreg)( unsigned regno, unsigned *red,
+					   unsigned *green, unsigned *blue,
+					   unsigned *transp, struct fb_info *info );
+	void (*set_screen_base)(void *s_base);
+	int  (*blank)( int blank_mode );
+	int  (*pan_display)( struct fb_var_screeninfo *var,
+						 struct atafb_par *par);
+} *fbhw;
+
+static char *autodetect_names[] = {"autodetect", NULL};
+static char *stlow_names[] = {"stlow", NULL};
+static char *stmid_names[] = {"stmid", "default5", NULL};
+static char *sthigh_names[] = {"sthigh", "default4", NULL};
+static char *ttlow_names[] = {"ttlow", NULL};
+static char *ttmid_names[]= {"ttmid", "default1", NULL};
+static char *tthigh_names[]= {"tthigh", "default2", NULL};
+static char *vga2_names[] = {"vga2", NULL};
+static char *vga4_names[] = {"vga4", NULL};
+static char *vga16_names[] = {"vga16", "default3", NULL};
+static char *vga256_names[] = {"vga256", NULL};
+static char *falh2_names[] = {"falh2", NULL};
+static char *falh16_names[] = {"falh16", NULL};
+
+static char **fb_var_names[] = {
+	/* Writing the name arrays directly in this array (via "(char *[]){...}")
+	 * crashes gcc 2.5.8 (sigsegv) if the inner array
+	 * contains more than two items. I've also seen that all elements
+	 * were identical to the last (my cross-gcc) :-(*/
+	autodetect_names,
+	stlow_names,
+	stmid_names,
+	sthigh_names,
+	ttlow_names,
+	ttmid_names,
+	tthigh_names,
+	vga2_names,
+	vga4_names,
+	vga16_names,
+	vga256_names,
+	falh2_names,
+	falh16_names,
+	NULL
+	/* ,NULL */ /* this causes a sigsegv on my gcc-2.5.8 */
+};
+
+static struct fb_var_screeninfo atafb_predefined[] = {
+ 	/*
+ 	 * yres_virtual==0 means use hw-scrolling if possible, else yres
+ 	 */
+ 	{ /* autodetect */
+	  0, 0, 0, 0, 0, 0, 0, 0,   		/* xres-grayscale */
+	  {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, 	/* red green blue tran*/
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+ 	{ /* st low */
+	  320, 200, 320, 0, 0, 0, 4, 0,
+	  {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* st mid */
+	  640, 200, 640, 0, 0, 0, 2, 0,
+	  {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* st high */
+	  640, 400, 640, 0, 0, 0, 1, 0,
+	  {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* tt low */
+	  320, 480, 320, 0, 0, 0, 8, 0,
+	  {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* tt mid */
+	  640, 480, 640, 0, 0, 0, 4, 0,
+	  {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* tt high */
+	  1280, 960, 1280, 0, 0, 0, 1, 0,
+	  {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* vga2 */
+	  640, 480, 640, 0, 0, 0, 1, 0,
+	  {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* vga4 */
+	  640, 480, 640, 0, 0, 0, 2, 0,
+	  {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* vga16 */
+	  640, 480, 640, 0, 0, 0, 4, 0,
+	  {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* vga256 */
+	  640, 480, 640, 0, 0, 0, 8, 0,
+	  {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* falh2 */
+	  896, 608, 896, 0, 0, 0, 1, 0,
+	  {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* falh16 */
+	  896, 608, 896, 0, 0, 0, 4, 0,
+	  {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+};
+
+static int num_atafb_predefined=ARRAY_SIZE(atafb_predefined);
+
+
+static int
+get_video_mode(char *vname)
+{
+    char ***name_list;
+    char **name;
+    int i;
+    name_list=fb_var_names;
+    for (i = 0 ; i < num_atafb_predefined ; i++) {
+	name=*(name_list++);
+	if (! name || ! *name)
+	    break;
+	while (*name) {
+	    if (! strcmp(vname, *name))
+		return i+1;
+	    name++;
+	}
+    }
+    return 0;
+}
+
+
+
+/* ------------------- TT specific functions ---------------------- */
+
+#ifdef ATAFB_TT
+
+static int tt_encode_fix( struct fb_fix_screeninfo *fix,
+						  struct atafb_par *par )
+
+{
+	int mode;
+
+	strcpy(fix->id,"Atari Builtin");
+	fix->smem_start = (unsigned long)real_screen_base;
+	fix->smem_len = screen_len;
+	fix->type=FB_TYPE_INTERLEAVED_PLANES;
+	fix->type_aux=2;
+	fix->visual=FB_VISUAL_PSEUDOCOLOR;
+	mode = par->hw.tt.mode & TT_SHIFTER_MODEMASK;
+	if (mode == TT_SHIFTER_TTHIGH || mode == TT_SHIFTER_STHIGH) {
+		fix->type=FB_TYPE_PACKED_PIXELS;
+		fix->type_aux=0;
+		if (mode == TT_SHIFTER_TTHIGH)
+			fix->visual=FB_VISUAL_MONO01;
+	}
+	fix->xpanstep=0;
+	fix->ypanstep=1;
+	fix->ywrapstep=0;
+	fix->line_length = 0;
+	fix->accel = FB_ACCEL_ATARIBLITT;
+	return 0;
+}
+
+
+static int tt_decode_var( struct fb_var_screeninfo *var,
+						  struct atafb_par *par )
+{
+	int xres=var->xres;
+	int yres=var->yres;
+	int bpp=var->bits_per_pixel;
+	int linelen;
+	int yres_virtual = var->yres_virtual;
+
+	if (mono_moni) {
+		if (bpp > 1 || xres > sttt_xres*2 || yres >tt_yres*2)
+			return -EINVAL;
+		par->hw.tt.mode=TT_SHIFTER_TTHIGH;
+		xres=sttt_xres*2;
+		yres=tt_yres*2;
+		bpp=1;
+	} else {
+		if (bpp > 8 || xres > sttt_xres || yres > tt_yres)
+			return -EINVAL;
+		if (bpp > 4) {
+			if (xres > sttt_xres/2 || yres > tt_yres)
+				return -EINVAL;
+			par->hw.tt.mode=TT_SHIFTER_TTLOW;
+			xres=sttt_xres/2;
+			yres=tt_yres;
+			bpp=8;
+		}
+		else if (bpp > 2) {
+			if (xres > sttt_xres || yres > tt_yres)
+				return -EINVAL;
+			if (xres > sttt_xres/2 || yres > st_yres/2) {
+				par->hw.tt.mode=TT_SHIFTER_TTMID;
+				xres=sttt_xres;
+				yres=tt_yres;
+				bpp=4;
+			}
+			else {
+				par->hw.tt.mode=TT_SHIFTER_STLOW;
+				xres=sttt_xres/2;
+				yres=st_yres/2;
+				bpp=4;
+			}
+		}
+		else if (bpp > 1) {
+			if (xres > sttt_xres || yres > st_yres/2)
+				return -EINVAL;
+			par->hw.tt.mode=TT_SHIFTER_STMID;
+			xres=sttt_xres;
+			yres=st_yres/2;
+			bpp=2;
+		}
+		else if (var->xres > sttt_xres || var->yres > st_yres) {
+			return -EINVAL;
+		}
+		else {
+			par->hw.tt.mode=TT_SHIFTER_STHIGH;
+			xres=sttt_xres;
+			yres=st_yres;
+			bpp=1;
+		}
+	}
+	if (yres_virtual <= 0)
+		yres_virtual = 0;
+	else if (yres_virtual < yres)
+		yres_virtual = yres;
+	if (var->sync & FB_SYNC_EXT)
+		par->hw.tt.sync=0;
+	else
+		par->hw.tt.sync=1;
+	linelen=xres*bpp/8;
+	if (yres_virtual * linelen > screen_len && screen_len)
+		return -EINVAL;
+	if (yres * linelen > screen_len && screen_len)
+		return -EINVAL;
+	if (var->yoffset + yres > yres_virtual && yres_virtual)
+		return -EINVAL;
+	par->yres_virtual = yres_virtual;
+	par->screen_base = screen_base + var->yoffset * linelen;
+	return 0;
+}
+
+static int tt_encode_var( struct fb_var_screeninfo *var,
+						  struct atafb_par *par )
+{
+	int linelen;
+	memset(var, 0, sizeof(struct fb_var_screeninfo));
+	var->red.offset=0;
+	var->red.length=4;
+	var->red.msb_right=0;
+	var->grayscale=0;
+
+	var->pixclock=31041;
+	var->left_margin=120;		/* these may be incorrect 	*/
+	var->right_margin=100;
+	var->upper_margin=8;
+	var->lower_margin=16;
+	var->hsync_len=140;
+	var->vsync_len=30;
+
+	var->height=-1;
+	var->width=-1;
+
+	if (par->hw.tt.sync & 1)
+		var->sync=0;
+	else
+		var->sync=FB_SYNC_EXT;
+
+	switch (par->hw.tt.mode & TT_SHIFTER_MODEMASK) {
+	case TT_SHIFTER_STLOW:
+		var->xres=sttt_xres/2;
+		var->xres_virtual=sttt_xres_virtual/2;
+		var->yres=st_yres/2;
+		var->bits_per_pixel=4;
+		break;
+	case TT_SHIFTER_STMID:
+		var->xres=sttt_xres;
+		var->xres_virtual=sttt_xres_virtual;
+		var->yres=st_yres/2;
+		var->bits_per_pixel=2;
+		break;
+	case TT_SHIFTER_STHIGH:
+		var->xres=sttt_xres;
+		var->xres_virtual=sttt_xres_virtual;
+		var->yres=st_yres;
+		var->bits_per_pixel=1;
+		break;
+	case TT_SHIFTER_TTLOW:
+		var->xres=sttt_xres/2;
+		var->xres_virtual=sttt_xres_virtual/2;
+		var->yres=tt_yres;
+		var->bits_per_pixel=8;
+		break;
+	case TT_SHIFTER_TTMID:
+		var->xres=sttt_xres;
+		var->xres_virtual=sttt_xres_virtual;
+		var->yres=tt_yres;
+		var->bits_per_pixel=4;
+		break;
+	case TT_SHIFTER_TTHIGH:
+		var->red.length=0;
+		var->xres=sttt_xres*2;
+		var->xres_virtual=sttt_xres_virtual*2;
+		var->yres=tt_yres*2;
+		var->bits_per_pixel=1;
+		break;
+	}		
+	var->blue=var->green=var->red;
+	var->transp.offset=0;
+	var->transp.length=0;
+	var->transp.msb_right=0;
+	linelen=var->xres_virtual * var->bits_per_pixel / 8;
+	if (! use_hwscroll)
+		var->yres_virtual=var->yres;
+	else if (screen_len) {
+		if (par->yres_virtual)
+			var->yres_virtual = par->yres_virtual;
+		else
+			/* yres_virtual==0 means use maximum */
+			var->yres_virtual = screen_len / linelen;
+	} else {
+		if (hwscroll < 0)
+			var->yres_virtual = 2 * var->yres;
+		else
+			var->yres_virtual=var->yres+hwscroll * 16;
+	}
+	var->xoffset=0;
+	if (screen_base)
+		var->yoffset=(par->screen_base - screen_base)/linelen;
+	else
+		var->yoffset=0;
+	var->nonstd=0;
+	var->activate=0;
+	var->vmode=FB_VMODE_NONINTERLACED;
+	return 0;
+}
+
+
+static void tt_get_par( struct atafb_par *par )
+{
+	unsigned long addr;
+	par->hw.tt.mode=shifter_tt.tt_shiftmode;
+	par->hw.tt.sync=shifter.syncmode;
+	addr = ((shifter.bas_hi & 0xff) << 16) |
+	       ((shifter.bas_md & 0xff) << 8)  |
+	       ((shifter.bas_lo & 0xff));
+	par->screen_base = phys_to_virt(addr);
+}
+
+static void tt_set_par( struct atafb_par *par )
+{
+	shifter_tt.tt_shiftmode=par->hw.tt.mode;
+	shifter.syncmode=par->hw.tt.sync;
+	/* only set screen_base if really necessary */
+	if (current_par.screen_base != par->screen_base)
+		fbhw->set_screen_base(par->screen_base);
+}
+
+
+static int tt_getcolreg(unsigned regno, unsigned *red,
+			unsigned *green, unsigned *blue,
+			unsigned *transp, struct fb_info *info)
+{
+	int t, col;
+
+	if ((shifter_tt.tt_shiftmode & TT_SHIFTER_MODEMASK) == TT_SHIFTER_STHIGH)
+		regno += 254;
+	if (regno > 255)
+		return 1;
+	t = tt_palette[regno];
+	col = t & 15;
+	col |= col << 4;
+	col |= col << 8;
+	*blue = col;
+	col = (t >> 4) & 15;
+	col |= col << 4;
+	col |= col << 8;
+	*green = col;
+	col = (t >> 8) & 15;
+	col |= col << 4;
+	col |= col << 8;
+	*red = col;
+	*transp = 0;
+	return 0;
+}
+
+
+static int tt_setcolreg(unsigned regno, unsigned red,
+			unsigned green, unsigned blue,
+			unsigned transp, struct fb_info *info)
+{
+	if ((shifter_tt.tt_shiftmode & TT_SHIFTER_MODEMASK) == TT_SHIFTER_STHIGH)
+		regno += 254;
+	if (regno > 255)
+		return 1;
+	tt_palette[regno] = (((red >> 12) << 8) | ((green >> 12) << 4) |
+			     (blue >> 12));
+	if ((shifter_tt.tt_shiftmode & TT_SHIFTER_MODEMASK) ==
+		TT_SHIFTER_STHIGH && regno == 254)
+		tt_palette[0] = 0;
+	return 0;
+}
+
+						  
+static int tt_detect( void )
+
+{	struct atafb_par par;
+
+	/* Determine the connected monitor: The DMA sound must be
+	 * disabled before reading the MFP GPIP, because the Sound
+	 * Done Signal and the Monochrome Detect are XORed together!
+	 *
+	 * Even on a TT, we should look if there is a DMA sound. It was
+	 * announced that the Eagle is TT compatible, but only the PCM is
+	 * missing...
+	 */
+	if (ATARIHW_PRESENT(PCM_8BIT)) { 
+		tt_dmasnd.ctrl = DMASND_CTRL_OFF;
+		udelay(20);	/* wait a while for things to settle down */
+	}
+	mono_moni = (mfp.par_dt_reg & 0x80) == 0;
+
+	tt_get_par(&par);
+	tt_encode_var(&atafb_predefined[0], &par);
+
+	return 1;
+}
+
+#endif /* ATAFB_TT */
+
+/* ------------------- Falcon specific functions ---------------------- */
+
+#ifdef ATAFB_FALCON
+
+static int mon_type;		/* Falcon connected monitor */
+static int f030_bus_width;	/* Falcon ram bus width (for vid_control) */
+#define F_MON_SM	0
+#define F_MON_SC	1
+#define F_MON_VGA	2
+#define F_MON_TV	3
+
+static struct pixel_clock {
+	unsigned long f;	/* f/[Hz] */
+	unsigned long t;	/* t/[ps] (=1/f) */
+	int right, hsync, left;	/* standard timing in clock cycles, not pixel */
+		/* hsync initialized in falcon_detect() */
+	int sync_mask;		/* or-mask for hw.falcon.sync to set this clock */
+	int control_mask;	/* ditto, for hw.falcon.vid_control */
+}
+f25  = {25175000, 39721, 18, 0, 42, 0x0, VCO_CLOCK25},
+f32  = {32000000, 31250, 18, 0, 42, 0x0, 0},
+fext = {       0,     0, 18, 0, 42, 0x1, 0};
+
+/* VIDEL-prescale values [mon_type][pixel_length from VCO] */
+static int vdl_prescale[4][3] = {{4,2,1}, {4,2,1}, {4,2,2}, {4,2,1}};
+
+/* Default hsync timing [mon_type] in picoseconds */
+static long h_syncs[4] = {3000000, 4875000, 4000000, 4875000};
+
+#ifdef FBCON_HAS_CFB16
+static u16 fbcon_cfb16_cmap[16];
+#endif
+
+static inline int hxx_prescale(struct falcon_hw *hw)
+{
+	return hw->ste_mode ? 16 :
+		   vdl_prescale[mon_type][hw->vid_mode >> 2 & 0x3];
+}
+
+static int falcon_encode_fix( struct fb_fix_screeninfo *fix,
+							  struct atafb_par *par )
+{
+	strcpy(fix->id, "Atari Builtin");
+	fix->smem_start = (unsigned long)real_screen_base;
+	fix->smem_len = screen_len;
+	fix->type = FB_TYPE_INTERLEAVED_PLANES;
+	fix->type_aux = 2;
+	fix->visual = FB_VISUAL_PSEUDOCOLOR;
+	fix->xpanstep = 1;
+	fix->ypanstep = 1;
+	fix->ywrapstep = 0;
+	if (par->hw.falcon.mono) {
+		fix->type = FB_TYPE_PACKED_PIXELS;
+		fix->type_aux = 0;
+		/* no smooth scrolling with longword aligned video mem */
+		fix->xpanstep = 32;
+	}
+	else if (par->hw.falcon.f_shift & 0x100) {
+		fix->type = FB_TYPE_PACKED_PIXELS;
+		fix->type_aux = 0;
+		/* Is this ok or should it be DIRECTCOLOR? */
+		fix->visual = FB_VISUAL_TRUECOLOR;
+		fix->xpanstep = 2;
+	}
+	fix->line_length = 0;
+	fix->accel = FB_ACCEL_ATARIBLITT;
+	return 0;
+}
+
+
+static int falcon_decode_var( struct fb_var_screeninfo *var,
+							  struct atafb_par *par )
+{
+	int bpp = var->bits_per_pixel;
+	int xres = var->xres;
+	int yres = var->yres;
+	int xres_virtual = var->xres_virtual;
+	int yres_virtual = var->yres_virtual;
+	int left_margin, right_margin, hsync_len;
+	int upper_margin, lower_margin, vsync_len;
+	int linelen;
+	int interlace = 0, doubleline = 0;
+	struct pixel_clock *pclock;
+	int plen; /* width of pixel in clock cycles */
+	int xstretch;
+	int prescale;
+	int longoffset = 0;
+	int hfreq, vfreq;
+
+/*
+	Get the video params out of 'var'. If a value doesn't fit, round
+	it up, if it's too big, return EINVAL.
+	Round up in the following order: bits_per_pixel, xres, yres, 
+	xres_virtual, yres_virtual, xoffset, yoffset, grayscale, bitfields, 
+	horizontal timing, vertical timing.
+
+	There is a maximum of screen resolution determined by pixelclock
+	and minimum frame rate -- (X+hmarg.)*(Y+vmarg.)*vfmin <= pixelclock.
+	In interlace mode this is     "     *    "     *vfmin <= pixelclock.
+	Additional constraints: hfreq.
+	Frequency range for multisync monitors is given via command line.
+	For TV and SM124 both frequencies are fixed.
+
+	X % 16 == 0 to fit 8x?? font (except 1 bitplane modes must use X%32==0)
+	Y % 16 == 0 to fit 8x16 font
+	Y % 8 == 0 if Y<400
+
+	Currently interlace and doubleline mode in var are ignored. 
+	On SM124 and TV only the standard resolutions can be used.
+*/
+
+	/* Reject uninitialized mode */
+	if (!xres || !yres || !bpp)
+		return -EINVAL;
+
+	if (mon_type == F_MON_SM && bpp != 1) {
+		return -EINVAL;
+	}
+	else if (bpp <= 1) {
+		bpp = 1;
+		par->hw.falcon.f_shift = 0x400;
+		par->hw.falcon.st_shift = 0x200;
+	}
+	else if (bpp <= 2) {
+		bpp = 2;
+		par->hw.falcon.f_shift = 0x000;
+		par->hw.falcon.st_shift = 0x100;
+	}
+	else if (bpp <= 4) {
+		bpp = 4;
+		par->hw.falcon.f_shift = 0x000;
+		par->hw.falcon.st_shift = 0x000;
+	}
+	else if (bpp <= 8) {
+		bpp = 8;
+		par->hw.falcon.f_shift = 0x010;
+	}
+	else if (bpp <= 16) {
+		bpp = 16; /* packed pixel mode */
+		par->hw.falcon.f_shift = 0x100; /* hicolor, no overlay */
+	}
+	else
+		return -EINVAL;
+	par->hw.falcon.bpp = bpp;
+
+	if (mon_type == F_MON_SM || DontCalcRes) {
+		/* Skip all calculations. VGA/TV/SC1224 only supported. */
+		struct fb_var_screeninfo *myvar = &atafb_predefined[0];
+		
+		if (bpp > myvar->bits_per_pixel ||
+			var->xres > myvar->xres ||
+			var->yres > myvar->yres)
+			return -EINVAL;
+		fbhw->get_par(par);	/* Current par will be new par */
+		goto set_screen_base;	/* Don't forget this */
+	}
+
+	/* Only some fixed resolutions < 640x400 */
+	if (xres <= 320)
+		xres = 320;
+	else if (xres <= 640 && bpp != 16)
+		xres = 640;
+	if (yres <= 200)
+		yres = 200;
+	else if (yres <= 240)
+		yres = 240;
+	else if (yres <= 400)
+		yres = 400;
+
+	/* 2 planes must use STE compatibility mode */
+	par->hw.falcon.ste_mode = bpp==2;
+	par->hw.falcon.mono = bpp==1;
+
+	/* Total and visible scanline length must be a multiple of one longword,
+	 * this and the console fontwidth yields the alignment for xres and
+	 * xres_virtual.
+	 * TODO: this way "odd" fontheights are not supported
+	 *
+	 * Special case in STE mode: blank and graphic positions don't align,
+	 * avoid trash at right margin
+	 */
+	if (par->hw.falcon.ste_mode)
+		xres = (xres + 63) & ~63;
+	else if (bpp == 1)
+		xres = (xres + 31) & ~31;
+	else
+		xres = (xres + 15) & ~15;
+	if (yres >= 400)
+		yres = (yres + 15) & ~15;
+	else
+		yres = (yres + 7) & ~7;
+
+	if (xres_virtual < xres)
+		xres_virtual = xres;
+	else if (bpp == 1)
+		xres_virtual = (xres_virtual + 31) & ~31;
+	else
+		xres_virtual = (xres_virtual + 15) & ~15;
+
+	if (yres_virtual <= 0)
+		yres_virtual = 0;
+	else if (yres_virtual < yres)
+		yres_virtual = yres;
+
+	/* backward bug-compatibility */
+	if (var->pixclock > 1)
+		var->pixclock -= 1;
+
+	par->hw.falcon.line_width = bpp * xres / 16;
+	par->hw.falcon.line_offset = bpp * (xres_virtual - xres) / 16;
+
+	/* single or double pixel width */
+	xstretch = (xres < 640) ? 2 : 1;
+
+#if 0 /* SM124 supports only 640x400, this is rejected above */
+	if (mon_type == F_MON_SM) {
+		if (xres != 640 && yres != 400)
+			return -EINVAL;
+		plen = 1;
+		pclock = &f32;
+		/* SM124-mode is special */
+		par->hw.falcon.ste_mode = 1;
+		par->hw.falcon.f_shift = 0x000;
+		par->hw.falcon.st_shift = 0x200;
+		left_margin = hsync_len = 128 / plen;
+		right_margin = 0;
+		/* TODO set all margins */
+	}
+	else
+#endif
+	if (mon_type == F_MON_SC || mon_type == F_MON_TV) {
+		plen = 2 * xstretch;
+		if (var->pixclock > f32.t * plen)
+			return -EINVAL;
+		pclock = &f32;
+		if (yres > 240)
+			interlace = 1;
+		if (var->pixclock == 0) {
+			/* set some minimal margins which center the screen */
+			left_margin = 32;
+			right_margin = 18;
+			hsync_len = pclock->hsync / plen;
+			upper_margin = 31;
+			lower_margin = 14;
+			vsync_len = interlace ? 3 : 4;
+		} else {
+			left_margin = var->left_margin;
+			right_margin = var->right_margin;
+			hsync_len = var->hsync_len;
+			upper_margin = var->upper_margin;
+			lower_margin = var->lower_margin;
+			vsync_len = var->vsync_len;
+			if (var->vmode & FB_VMODE_INTERLACED) {
+				upper_margin = (upper_margin + 1) / 2;
+				lower_margin = (lower_margin + 1) / 2;
+				vsync_len = (vsync_len + 1) / 2;
+			} else if (var->vmode & FB_VMODE_DOUBLE) {
+				upper_margin *= 2;
+				lower_margin *= 2;
+				vsync_len *= 2;
+			}
+		}
+	}
+	else
+	{	/* F_MON_VGA */
+		if (bpp == 16)
+			xstretch = 2; /* Double pixel width only for hicolor */
+		/* Default values are used for vert./hor. timing if no pixelclock given. */
+		if (var->pixclock == 0) {
+			int linesize;
+
+			/* Choose master pixelclock depending on hor. timing */
+			plen = 1 * xstretch;
+			if ((plen * xres + f25.right+f25.hsync+f25.left) *
+			    fb_info.monspecs.hfmin < f25.f)
+				pclock = &f25;
+			else if ((plen * xres + f32.right+f32.hsync+f32.left) * 
+			    fb_info.monspecs.hfmin < f32.f)
+				pclock = &f32;
+			else if ((plen * xres + fext.right+fext.hsync+fext.left) * 
+			    fb_info.monspecs.hfmin < fext.f
+			         && fext.f)
+				pclock = &fext;
+			else
+				return -EINVAL;
+
+			left_margin = pclock->left / plen;
+			right_margin = pclock->right / plen;
+			hsync_len = pclock->hsync / plen;
+			linesize = left_margin + xres + right_margin + hsync_len;
+			upper_margin = 31;
+			lower_margin = 11;
+			vsync_len = 3;
+		}
+		else {
+			/* Choose largest pixelclock <= wanted clock */
+			int i;
+			unsigned long pcl = ULONG_MAX;
+			pclock = 0;
+			for (i=1; i <= 4; i *= 2) {
+				if (f25.t*i >= var->pixclock && f25.t*i < pcl) {
+					pcl = f25.t * i;
+					pclock = &f25;
+				}
+				if (f32.t*i >= var->pixclock && f32.t*i < pcl) {
+					pcl = f32.t * i;
+					pclock = &f32;
+				}
+				if (fext.t && fext.t*i >= var->pixclock && fext.t*i < pcl) {
+					pcl = fext.t * i;
+					pclock = &fext;
+				}
+			}
+			if (!pclock)
+				return -EINVAL;
+			plen = pcl / pclock->t;
+
+			left_margin = var->left_margin;
+			right_margin = var->right_margin;
+			hsync_len = var->hsync_len;
+			upper_margin = var->upper_margin;
+			lower_margin = var->lower_margin;
+			vsync_len = var->vsync_len;
+			/* Internal unit is [single lines per (half-)frame] */
+			if (var->vmode & FB_VMODE_INTERLACED) {
+				/* # lines in half frame */
+				/* External unit is [lines per full frame] */
+				upper_margin = (upper_margin + 1) / 2;
+				lower_margin = (lower_margin + 1) / 2;
+				vsync_len = (vsync_len + 1) / 2;
+			}
+			else if (var->vmode & FB_VMODE_DOUBLE) {
+				/* External unit is [double lines per frame] */
+				upper_margin *= 2;
+				lower_margin *= 2;
+				vsync_len *= 2;
+			}
+		}
+		if (pclock == &fext)
+			longoffset = 1; /* VIDEL doesn't synchronize on short offset */
+	}
+	/* Is video bus bandwidth (32MB/s) too low for this resolution? */
+	/* this is definitely wrong if bus clock != 32MHz */
+	if (pclock->f / plen / 8 * bpp > 32000000L)
+		return -EINVAL;
+
+	if (vsync_len < 1)
+		vsync_len = 1;
+
+	/* include sync lengths in right/lower margin for all calculations */
+	right_margin += hsync_len;
+	lower_margin += vsync_len;
+
+	/* ! In all calculations of margins we use # of lines in half frame
+	 * (which is a full frame in non-interlace mode), so we can switch
+	 * between interlace and non-interlace without messing around
+	 * with these.
+	 */
+  again:
+	/* Set base_offset 128 and video bus width */
+	par->hw.falcon.vid_control = mon_type | f030_bus_width;
+	if (!longoffset)
+		par->hw.falcon.vid_control |= VCO_SHOR