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/*
 * atari/atafb.c -- Low level implementation of Atari 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.
 *
 *
 * 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/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/malloc.h>
#include <linux/delay.h>
 
#include <asm/segment.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
 
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/bootinfo.h>
 
#include <linux/fb.h>
#include <asm/atarikb.h>
 
#define SWITCH_ACIA 0x01                /* modes for switch on OverScan */
#define SWITCH_SND6 0x40
#define SWITCH_SND7 0x80
#define SWITCH_NONE 0x00
 
 
#define arraysize(x)                    (sizeof(x)/sizeof(*(x)))
 
#define up(x, r) (((x) + (r) - 1) & ~((r)-1))
 
 
static int default_par=0;        /* default resolution (0=none) */
 
static int node;                /* node of the /dev/fb?current file */
 
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;
int        ovsc_switchmode=0;
 
#ifdef ATAFB_FALCON
static int pwrsave = 0;  /* use VESA suspend mode instead of blanking only? */
#endif
 
static struct atari_fb_par {
        unsigned long screen_base;
        int vyres;
        union {
                struct {
                        int mode;
                        int sync;
                } tt, st;
                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;
                /* 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;
 
#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
 
static struct fb_info fb_info;
 
static unsigned long screen_base;       /* base address of screen */
static unsigned long real_screen_base;  /* (only for Overscan) */
 
static int screen_len;
 
static int current_par_valid=0;
 
static int currcon=0;
 
static int mono_moni=0;
 
static struct display disp[MAX_NR_CONSOLES];
 
 
#ifdef ATAFB_EXT
/* external video handling */
 
static unsigned                 external_xres;
static unsigned                 external_yres;
static unsigned                 external_depth;
static int                              external_pmode;
static unsigned long    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 acces 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!
*/
 
struct { unsigned char red,green,blue,pad; } MV300_color[256];
#endif /* ATAFB_EXT */
 
 
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[];
 
/* import first 16 colors from fbcon.c */
extern unsigned short packed16_cmap[16];
 
 
/* ++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 atari_fb_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 atari_fb_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 atari_fb_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 atari_fb_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 atari_fb_par *par )
 *   Fill the hardware's 'par' structure.
 *
 * void (*set_par)( struct atari_fb_par *par )
 *   Set the hardware according to 'par'.
 *
 * int (*setcolreg)( unsigned regno, unsigned red,
 *                   unsigned green, unsigned blue,
 *                   unsigned transp )
 *   Set a single color register. The values supplied are already
 *   rounded down to the hardware's capabilities (according to the
 *   entries in the var structure). Return != 0 for invalid regno.
 *
 * int (*getcolreg)( unsigned regno, unsigned *red,
 *                   unsigned *green, unsigned *blue,
 *                   unsigned *transp )
 *   Read a single color register and split it into
 *   colors/transparent. Return != 0 for invalid regno.
 *
 * void (*set_screen_base)( unsigned long 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 NULL then blanking
 *   is done by setting the CLUT to black. Return != 0 if un-/blanking
 *   failed due to e.g. video mode which doesn't support it.
 */
 
static struct fb_hwswitch {
        int  (*detect)( void );
        int  (*encode_fix)( struct fb_fix_screeninfo *fix,
                                                struct atari_fb_par *par );
        int  (*decode_var)( struct fb_var_screeninfo *var,
                                                struct atari_fb_par *par );
        int  (*encode_var)( struct fb_var_screeninfo *var,
                                                struct atari_fb_par *par );
        void (*get_par)( struct atari_fb_par *par );
        void (*set_par)( struct atari_fb_par *par );
        int  (*getcolreg)( unsigned regno, unsigned *red,
                                           unsigned *green, unsigned *blue,
                                           unsigned *transp );
        int  (*setcolreg)( unsigned regno, unsigned red,
                                           unsigned green, unsigned blue,
                                           unsigned transp );
        void (*set_screen_base)( unsigned long s_base );
        int  (*blank)( int blank_mode );
        int  (*pan_display)( struct fb_var_screeninfo *var,
                                                 struct atari_fb_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 *user0_names[] = {"user0", NULL};
static char *user1_names[] = {"user1", NULL};
static char *user2_names[] = {"user2", NULL};
static char *user3_names[] = {"user3", NULL};
static char *user4_names[] = {"user4", NULL};
static char *user5_names[] = {"user5", NULL};
static char *user6_names[] = {"user6", NULL};
static char *user7_names[] = {"user7", NULL};
static char *dummy_names[] = {"dummy", NULL};
 
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,
        dummy_names, dummy_names, dummy_names, dummy_names,
        dummy_names, dummy_names, dummy_names, dummy_names,
        dummy_names, dummy_names,
        user0_names,
        user1_names,
        user2_names,
        user3_names,
        user4_names,
        user5_names,
        user6_names,
        user7_names,
        NULL
        /* ,NULL */ /* this causes a sigsegv on my gcc-2.5.8 */
};
 
struct fb_var_screeninfo atari_fb_predefined[] = {
        { /* 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, 200, 0, 0, 4, 0,                  /* xres-grayscale */
          {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* st mid */
          640, 200, 640, 200, 0, 0, 2, 0,          /* xres-grayscale */
          {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* st high */
          640, 400, 640, 400, 0, 0, 1, 0,          /* xres-grayscale */
          {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* tt low */
          320, 480, 320, 480, 0, 0, 8, 0,          /* xres-grayscale */
          {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* tt mid */
          640, 480, 640, 480, 0, 0, 4, 0,          /* xres-grayscale */
          {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* tt high */
          1280, 960, 1280, 960, 0, 0, 1, 0,                /* xres-grayscale */
          {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* vga2 */
          640, 480, 640, 480, 0, 0, 1, 0,                  /* xres-grayscale */
          {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* vga4 */
          640, 480, 640, 480, 0, 0, 2, 0,          /* xres-grayscale */
          {0, 4, 0}, {0, 4, 0}, {0, 4, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* vga16 */
          640, 480, 640, 480, 0, 0, 4, 0,          /* xres-grayscale */
          {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* vga256 */
          640, 480, 640, 480, 0, 0, 8, 0,          /* xres-grayscale */
          {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* falh2 */
          896, 608, 896, 608, 0, 0, 1, 0,          /* xres-grayscale */
          {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        { /* falh16 */
          896, 608, 896, 608, 0, 0, 4, 0,          /* xres-grayscale */
          {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},    /* red green blue tran*/
          0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
        /* Minor 14..23 free for more standard video modes */
        { 0, },
        { 0, },
        { 0, },
        { 0, },
        { 0, },
        { 0, },
        { 0, },
        { 0, },
        { 0, },
        { 0, },
        /* Minor 24..31 reserved for user defined video modes */
        { /* user0, initialized to Rx;y;d from commandline, if supplied */
          0, 0, 0, 0, 0, 0, 0, 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 },
        { /* user1 */
          0, 0, 0, 0, 0, 0, 0, 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 },
        { /* user2 */
          0, 0, 0, 0, 0, 0, 0, 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 },
        { /* user3 */
          0, 0, 0, 0, 0, 0, 0, 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 },
        { /* user4 */
          0, 0, 0, 0, 0, 0, 0, 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 },
        { /* user5 */
          0, 0, 0, 0, 0, 0, 0, 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 },
        { /* user6 */
          0, 0, 0, 0, 0, 0, 0, 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 },
        { /* user7 */
          0, 0, 0, 0, 0, 0, 0, 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 }
};
 
int num_atari_fb_predefined=arraysize(atari_fb_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_atari_fb_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 atari_fb_par *par )
 
{
        int mode, i;
 
        strcpy(fix->id,"Atari Builtin");
        fix->smem_start=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;
        for (i=0; i<arraysize(fix->reserved); i++)
                fix->reserved[i]=0;
        return 0;
}
 
 
static int tt_decode_var( struct fb_var_screeninfo *var,
                                                  struct atari_fb_par *par )
{
        int xres=var->xres;
        int yres=var->yres;
        int bpp=var->bits_per_pixel;
        int linelen;
 
        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 (var->sync & FB_SYNC_EXT)
                par->hw.tt.sync=0;
        else
                par->hw.tt.sync=1;
        linelen=xres*bpp/8;
        if ((var->yoffset + yres)*linelen > screen_len && screen_len)
                return -EINVAL;
        par->screen_base=screen_base+ var->yoffset*linelen;
        return 0;
}
 
static int tt_encode_var( struct fb_var_screeninfo *var,
                                                  struct atari_fb_par *par )
{
        int linelen, i;
        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)
                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;
        for (i=0; i<arraysize(var->reserved); i++)
                var->reserved[i]=0;
        return 0;
}
 
 
static void tt_get_par( struct atari_fb_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 = PTOV(addr);
}
 
static void tt_set_par( struct atari_fb_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 )
{
        if ((shifter_tt.tt_shiftmode & TT_SHIFTER_MODEMASK) == TT_SHIFTER_STHIGH)
                regno += 254;
        if (regno > 255)
                return 1;
        *blue = tt_palette[regno];
        *green = (*blue >> 4) & 0xf;
        *red = (*blue >> 8) & 0xf;
        *blue &= 0xf;
        *transp = 0;
        return 0;
}
 
 
static int tt_setcolreg( unsigned regno, unsigned red,
                                                 unsigned green, unsigned blue,
                                                 unsigned transp )
{
        if ((shifter_tt.tt_shiftmode & TT_SHIFTER_MODEMASK) == TT_SHIFTER_STHIGH)
                regno += 254;
        if (regno > 255)
                return 1;
        tt_palette[regno] = (red << 8) | (green << 4) | blue;
        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 atari_fb_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(&atari_fb_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
 
/* Multisync monitor capabilities */
/* Atari-TOS defaults if no boot option present */
static long vfmin=58, vfmax=62, hfmin=31000, hfmax=32000;
 
static struct pixel_clock {
        unsigned long f;        /* f/[Hz] */
        unsigned long t;        /* t/[ps] (=1/f) */
        short right, hsync, left;       /* standard timing in clock cycles, not pixel */
                /* hsync initialized in falcon_detect() */
        short sync_mask;        /* or-mask for hw.falcon.sync to set this clock */
        short control_mask; /* ditto, for hw.falcon.vid_control */
}
f25  = {25175000, 39722, 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 short 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, 4700000, 4000000, 4700000};
 
 
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 atari_fb_par *par )
{
        int i;
 
        strcpy(fix->id, "Atari Builtin");
        fix->smem_start = real_screen_base;
        fix->smem_len = screen_len;
        fix->type = FB_TYPE_INTERLEAVED_PLANES;
        fix->type_aux = 2;
        fix->visual = FB_VISUAL_PSEUDOCOLOR;
        if (par->hw.falcon.mono) {
                fix->type = FB_TYPE_PACKED_PIXELS;
                fix->type_aux = 0;
        }
        else if (par->hw.falcon.f_shift & 0x100) {
                fix->type = FB_TYPE_PACKED_PIXELS;
                fix->type_aux = 0;
                fix->visual = FB_VISUAL_TRUECOLOR;  /* is this ok or should this be DIRECTCOLOR? */
        }
        if (par->hw.falcon.mono)
                /* no smooth scrolling possible with longword aligned video mem */
                fix->xpanstep = 32;
        else
                fix->xpanstep = 1;
        fix->ypanstep = 1;
        fix->ywrapstep = 0;
        fix->line_length = 0;
        for (i=0; i<arraysize(fix->reserved); i++)
                fix->reserved[i]=0;
        return 0;
}
 
 
static int falcon_decode_var( struct fb_var_screeninfo *var,
                                                          struct atari_fb_par *par )
{
        int use_default_timing = 0;
        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_VGA || DontCalcRes) {
                /* Skip all calculations, VGA multisync only yet */
                struct fb_var_screeninfo *myvar = &atari_fb_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 < 640x480 */
        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;
        else if (yres <= 480)
                yres = 480;
 
        /* 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.
         *
         * 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;
        /* <=0 : yres_virtual determined by screensize */
        if (yres_virtual < yres && yres_virtual > 0)
                yres_virtual = yres;
 
        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 == 320) ? 2 : 1;
 
        /* Default values are used for vert./hor. timing if no pixelclock given. */
        if (var->pixclock == 0)
                use_default_timing = 1;
 
#if 0 /* currently unused */
        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 if (mon_type == F_MON_SC || mon_type == F_MON_TV) {
                plen = 2 * xstretch;
                pclock = &f32;
                hsync_len = 150 / plen;
                if (yres > 240)
                        interlace = 1;
                /* TODO set margins */
        }
        else
#endif
        {       /* F_MON_VGA */
                if (bpp == 16)
                        xstretch = 2; /* hicolor only double pixel width */
                if (use_default_timing) {
                        int linesize;
 
                        /* Choose master pixelclock depending on hor. timing */
                        plen = 1 * xstretch;
                        if ((plen * xres + f25.right+f25.hsync+f25.left) * hfmin < f25.f)
                                pclock = &f25;
                        else if ((plen * xres + f32.right+f32.hsync+f32.left) * hfmin < f32.f)
                                pclock = &f32;
                        else if ((plen * xres + fext.right+fext.hsync+fext.left) * 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 {
#if 0 /* TODO enable this (untested yet) */
                        /* Round down pixelclock */
                        int i; unsigned long pcl=0;
                        for (i=1; i<=4; i*=2) {
                                if (f25.t*i<=var->pixclock && pcl<f25.t*i) {
                                        pcl=f25.t*i; pclock=&f25;
                                }
                                if (f32.t*i<=var->pixclock && pcl<f32.t*i) {
                                        pcl=f32.t*i; pclock=&f32;
                                }
                                if (fext.t && fext.t*i<=var->pixclock && pcl<fext.t*i) {
                                        pcl=fext.t*i; pclock=&fext;
                                }
                        }
                        if (!pcl)
                                return -EINVAL;
                        plen = pcl / pclock->t;
 
#else
                        if (var->pixclock == f25.t || var->pixclock == 2*f25.t)
                                pclock = &f25;
                        else if (var->pixclock == f32.t || var->pixclock == 2*f32.t)
                                pclock = &f32;
                        else if ((var->pixclock == fext.t || var->pixclock == 2*fext.t) && fext.t) {
                                pclock = &fext;
                        }
                        else
                                return -EINVAL;
                        plen = var->pixclock / pclock->t;
#endif
 
                        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) {
                                /* # lines in half frame */
                                upper_margin = (upper_margin + 1) / 2;
                                lower_margin = (lower_margin + 1) / 2;
                                vsync_len = (vsync_len + 1) / 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_SHORTOFFS;    /* base_offset 64 */
        if (var->sync & FB_SYNC_HOR_HIGH_ACT)
                par->hw.falcon.vid_control |= VCO_HSYPOS;
        if (var->sync & FB_SYNC_VERT_HIGH_ACT)
                par->hw.falcon.vid_control |= VCO_VSYPOS;
        /* Pixelclock */
        par->hw.falcon.vid_control |= pclock->control_mask;
        /* External or internal clock */
        par->hw.falcon.sync = pclock->sync_mask | 0x2;
        /* Pixellength and prescale */
        par->hw.falcon.vid_mode = (2/plen) << 2;
        if (doubleline)
                par->hw.falcon.vid_mode |= VMO_DOUBLE;
        if (interlace)
                par->hw.falcon.vid_mode |= VMO_INTER;
 
        /*********************
        Horizontal timing: unit = [master clock cycles]
        unit of hxx-registers: [master clock cycles * prescale]
        Hxx-registers are 9-bit wide
 
        1 line = ((hht + 2) * 2 * prescale) clock cycles
 
        graphic output = hdb & 0x200 ?
               ((hht+2)*2 - hdb + hde) * prescale - hdboff + hdeoff:
               ( hht + 2  - hdb + hde) * prescale - hdboff + hdeoff
        (this must be a multiple of plen*128/bpp, on VGA pixels
         to the right may be cut off with a bigger right margin)
 
        start of graphics relative to start of 1st halfline = hdb & 0x200 ?
               (hdb - hht - 2) * prescale + hdboff :
               hdb * prescale + hdboff
 
        end of graphics relative to start of 1st halfline =
               (hde + hht + 2) * prescale + hdeoff
        *********************/
        /* Calculate VIDEL registers */
        {
        int hdb_off, hde_off, base_off;
        int gstart, gend1, gend2, align;
 
        prescale = hxx_prescale(&par->hw.falcon);
        base_off = par->hw.falcon.vid_control & VCO_SHORTOFFS ? 64 : 128;
 
        /* Offsets depend on video mode */
        /* Offsets are in clock cycles, divide by prescale to
         * calculate hd[be]-registers
         */
        if (par->hw.falcon.f_shift & 0x100) {
                align = 1;
                hde_off = 0;
                hdb_off = (base_off + 16 * plen) + prescale;
        }
        else {
                align = 128 / bpp;
                hde_off = ((128 / bpp + 2) * plen);
                if (par->hw.falcon.ste_mode)
                        hdb_off = (64 + base_off + (128 / bpp + 2) * plen) + prescale;
                else
                        hdb_off = (base_off + (128 / bpp + 18) * plen) + prescale;
        }
 
        gstart = (prescale/2 + plen * left_margin) / prescale;
        /* gend1 is for hde (gend-gstart multiple of align), shifter's xres */
        gend1 = gstart + ((xres + align-1) / align)*align * plen / prescale;
        /* gend2 is for hbb, visible xres (rest to gend1 is cut off by hblank) */
        gend2 = gstart + xres * plen / prescale;
        par->HHT = plen * (left_margin + xres + right_margin) /
                           (2 * prescale) - 2;
/*      par->HHT = (gend2 + plen * right_margin / prescale) / 2 - 2;*/
 
        par->HDB = gstart - hdb_off/prescale;
        par->HBE = gstart;
        if (par->HDB < 0) par->HDB += par->HHT + 2 + 0x200;
        par->HDE = gend1 - par->HHT - 2 - hde_off/prescale;
        par->HBB = gend2 - par->HHT - 2;
#if 0
        /* One more Videl constraint: data fetch of two lines must not overlap */
        if (par->HDB & 0x200  &&  par->HDB & ~0x200 - par->HDE <= 5) {
                /* if this happens increase margins, decrease hfreq. */
        }
#endif
        if (hde_off % prescale)
                par->HBB++;             /* compensate for non matching hde and hbb */
        par->HSS = par->HHT + 2 - plen * hsync_len / prescale;
        if (par->HSS < par->HBB)
                par->HSS = par->HBB;
        }
 
        /*  check hor. frequency */
        hfreq = pclock->f / ((par->HHT+2)*prescale*2);
        if (hfreq > hfmax && mon_type!=F_MON_VGA) {
                /* ++guenther:   ^^^^^^^^^^^^^^^^^^^ can't remember why I did this */
                /* Too high -> enlarge margin */
                left_margin += 1;
                right_margin += 1;
                goto again;
        }
        if (hfreq > hfmax || hfreq < hfmin)
                return -EINVAL;
 
        /* Vxx-registers */
        /* All Vxx must be odd in non-interlace, since frame starts in the middle
         * of the first displayed line!
         * One frame consists of VFT+1 half lines. VFT+1 must be even in
         * non-interlace, odd in interlace mode for synchronisation.
         * Vxx-registers are 11-bit wide
         */
        par->VBE = (upper_margin * 2 + 1); /* must begin on odd halfline */
        par->VDB = par->VBE;
        par->VDE = yres;
        if (!interlace) par->VDE <<= 1;
        if (doubleline) par->VDE <<= 1;  /* VDE now half lines per (half-)frame */
        par->VDE += par->VDB;
        par->VBB = par->VDE;
        par->VFT = par->VBB + (lower_margin * 2 - 1) - 1;
        par->VSS = par->VFT+1 - (vsync_len * 2 - 1);
        /* vbb,vss,vft must be even in interlace mode */
        if (interlace) {
                par->VBB++;
                par->VSS++;
                par->VFT++;
        }
 
        /* V-frequency check, hope I didn't create any loop here. */
        /* Interlace and doubleline are mutually exclusive. */
        vfreq = (hfreq * 2) / (par->VFT + 1);
        if      (vfreq > vfmax && !doubleline && !interlace) {
                /* Too high -> try again with doubleline */
                doubleline = 1;
                goto again;
        }
        else if (vfreq < vfmin && !interlace && !doubleline) {
                /* Too low -> try again with interlace */
                interlace = 1;
                goto again;
        }
        else if (vfreq < vfmin && doubleline) {
                /* Doubleline too low -> clear doubleline and enlarge margins */
                int lines;
                doubleline = 0;
                for (lines=0; (hfreq*2)/(par->VFT+1+4*lines-2*yres)>vfmax; lines++)
                        ;
                upper_margin += lines;
                lower_margin += lines;
                goto again;
        }
        else if (vfreq > vfmax && interlace) {
                /* Interlace, too high -> enlarge margins */
                int lines;
                for (lines=0; (hfreq*2)/(par->VFT+1+4*lines)>vfmax; lines++)
                        ;
                upper_margin += lines;
                lower_margin += lines;
                goto again;
        }
        else if (vfreq < vfmin || vfreq > vfmax)
                return -EINVAL;
 
  set_screen_base:
        linelen = xres_virtual * bpp / 8;
        if ((var->yoffset + yres)*linelen > screen_len && screen_len)
                return -EINVAL;
        if (var->yres_virtual * linelen > screen_len && screen_len)
                return -EINVAL;
        if (var->yres * linelen > screen_len && screen_len)
                return -EINVAL;
        par->vyres = yres_virtual;
        par->screen_base = screen_base + var->yoffset * linelen;
        par->hw.falcon.xoffset = 0;
 
        return 0;
}
 
static int falcon_encode_var( struct fb_var_screeninfo *var,
                                                          struct atari_fb_par *par )
{
/* !!! only for VGA !!! */
        int linelen, i;
        int prescale, plen;
        int hdb_off, hde_off, base_off;
        struct falcon_hw *hw = &par->hw.falcon;
 
        /* possible frequencies: 25.175 or 32MHz */
        var->pixclock = hw->sync & 0x1 ? fext.t :
                        hw->vid_control & VCO_CLOCK25 ? f25.t : f32.t;
 
        var->height=-1;
        var->width=-1;
 
        var->sync=0;
        if (hw->vid_control & VCO_HSYPOS)
                var->sync |= FB_SYNC_HOR_HIGH_ACT;
        if (hw->vid_control & VCO_VSYPOS)
                var->sync |= FB_SYNC_VERT_HIGH_ACT;
 
        var->vmode = FB_VMODE_NONINTERLACED;
        if (hw->vid_mode & VMO_INTER)
                var->vmode |= FB_VMODE_INTERLACED;
        if (hw->vid_mode & VMO_DOUBLE)
                var->vmode |= FB_VMODE_DOUBLE;
 
        /* visible y resolution:
         * Graphics display starts at line VDB and ends at line
         * VDE. If interlace mode off unit of VC-registers is
         * half lines, else lines.
         */
        var->yres = hw->vde - hw->vdb;
        if (!(var->vmode & FB_VMODE_INTERLACED))
                var->yres >>= 1;
        if (var->vmode & FB_VMODE_DOUBLE)
                var->yres >>= 1;
 
        /* to get bpp, we must examine f_shift and st_shift.
         * f_shift is valid if any of bits no. 10, 8 or 4
         * is set. Priority in f_shift is: 10 ">" 8 ">" 4, i.e.
         * if bit 10 set then bit 8 and bit 4 don't care...
         * If all these bits are 0 get display depth from st_shift
         * (as for ST and STE)
         */
        if (hw->f_shift & 0x400)                /* 2 colors */
                var->bits_per_pixel = 1;
        else if (hw->f_shift & 0x100)   /* hicolor */
                var->bits_per_pixel = 16;
        else if (hw->f_shift & 0x010)   /* 8 bitplanes */
                var->bits_per_pixel = 8;
        else if (hw->st_shift == 0)
                var->bits_per_pixel = 4;
        else if (hw->st_shift == 0x100)
                var->bits_per_pixel = 2;
        else /* if (hw->st_shift == 0x200) */
                var->bits_per_pixel = 1;
 
        var->xres = hw->line_width * 16 / var->bits_per_pixel;
        var->xres_virtual = var->xres + hw->line_offset * 16 / var->bits_per_pixel;
        if (hw->xoffset)
                var->xres_virtual += 16;
 
        if (var->bits_per_pixel == 16) {
                var->red.offset=11;
                var->red.length=5;
                var->red.msb_right=0;
                var->green.offset=5;
                var->green.length=6;
                var->green.msb_right=0;
                var->blue.offset=0;
                var->blue.length=5;
                var->blue.msb_right=0;
        }
        else {
                var->red.offset=0;
                var->red.length = hw->ste_mode ? 4 : 6;
                var->red.msb_right=0;
                var->grayscale=0;
                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 (screen_len)
                if (par->vyres)
                        var->yres_virtual = par->vyres;
                else
                        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; /* TODO change this */
 
        /* hdX-offsets */
        prescale = hxx_prescale(hw);
        plen = 4 >> (hw->vid_mode >> 2 & 0x3);
        base_off = hw->vid_control & VCO_SHORTOFFS ? 64 : 128;
        if (hw->f_shift & 0x100) {
                hde_off = 0;
                hdb_off = (base_off + 16 * plen) + prescale;
        }
        else {
                hde_off = ((128 / var->bits_per_pixel + 2) * plen);
                if (hw->ste_mode)
                        hdb_off = (64 + base_off + (128 / var->bits_per_pixel + 2) * plen)
                                         + prescale;
                else
                        hdb_off = (base_off + (128 / var->bits_per_pixel + 18) * plen)
                                         + prescale;
        }
 
        /* Right margin includes hsync */
        var->left_margin = hdb_off + prescale * ((hw->hdb & 0x1ff) -
                                           (hw->hdb & 0x200 ? 2+hw->hht : 0));
        if (hw->ste_mode || mon_type!=F_MON_VGA)
                var->right_margin = prescale * (hw->hht + 2 - hw->hde) - hde_off;
        else
                /* can't use this in ste_mode, because hbb is +1 off */
                var->right_margin = prescale * (hw->hht + 2 - hw->hbb);
        var->hsync_len = prescale * (hw->hht + 2 - hw->hss);
 
        /* Lower margin includes vsync */
        var->upper_margin = hw->vdb / 2 ;  /* round down to full lines */
        var->lower_margin = (hw->vft+1 - hw->vde + 1) / 2; /* round up */
        var->vsync_len    = (hw->vft+1 - hw->vss + 1) / 2; /* round up */
        if (var->vmode & FB_VMODE_INTERLACED) {
                var->upper_margin *= 2;
                var->lower_margin *= 2;
                var->vsync_len *= 2;
        }
 
        var->pixclock *= plen;
        var->left_margin /= plen;
        var->right_margin /= plen;
        var->hsync_len /= plen;
 
        var->right_margin -= var->hsync_len;
        var->lower_margin -= var->vsync_len;
 
        if (screen_base)
                var->yoffset=(par->screen_base - screen_base)/linelen;
        else
                var->yoffset=0;
        var->nonstd=0;   /* what is this for? */
        var->activate=0;
        for (i=0; i<arraysize(var->reserved); i++)
                var->reserved[i]=0;
        return 0;
}
 
 
static int f_change_mode = 0;
static struct falcon_hw f_new_mode;
static int f_pan_display = 0;
 
static void falcon_get_par( struct atari_fb_par *par )
{
        unsigned long addr;
        struct falcon_hw *hw = &par->hw.falcon;
 
        hw->line_width = shifter_f030.scn_width;
        hw->line_offset = shifter_f030.off_next;
        hw->st_shift = videl.st_shift & 0x300;
        hw->f_shift = videl.f_shift;
        hw->vid_control = videl.control;
        hw->vid_mode = videl.mode;
        hw->sync = shifter.syncmode & 0x1;
        hw->xoffset = videl.xoffset & 0xf;
        hw->hht = videl.hht;
        hw->hbb = videl.hbb;
        hw->hbe = videl.hbe;
        hw->hdb = videl.hdb;
        hw->hde = videl.hde;
        hw->hss = videl.hss;
        hw->vft = videl.vft;
        hw->vbb = videl.vbb;
        hw->vbe = videl.vbe;
        hw->vdb = videl.vdb;
        hw->vde = videl.vde;
        hw->vss = videl.vss;
 
        addr = (shifter.bas_hi & 0xff) << 16 |
               (shifter.bas_md & 0xff) << 8  |
               (shifter.bas_lo & 0xff);
        par->screen_base = PTOV(addr);
 
        /* derived parameters */
        hw->ste_mode = (hw->f_shift & 0x510)==0 && hw->st_shift==0x100;
        hw->mono = (hw->f_shift & 0x400) ||
                   ((hw->f_shift & 0x510)==0 && hw->st_shift==0x200);
}
 
static void falcon_set_par( struct atari_fb_par *par )
{
        f_change_mode = 0;
 
        /* only set screen_base if really necessary */
        if (current_par.screen_base != par->screen_base)
                fbhw->set_screen_base(par->screen_base);
 
        /* Don't touch any other registers if we keep the default resolution */
        if (DontCalcRes)
                return;
 
        /* Tell vbl-handler to change video mode.
         * We change modes only on next VBL, to avoid desynchronisation
         * (a shift to the right and wrap around by a random number of pixels
         * in all monochrome modes).
         * This seems to work on my Falcon.
         */
        f_new_mode = par->hw.falcon;
        f_change_mode = 1;
}
 
 
static void falcon_vbl_switcher( int irq, struct pt_regs *fp, void *dummy )
{
        struct falcon_hw *hw = &f_new_mode;
 
        if (f_change_mode) {
                f_change_mode = 0;
 
                if (hw->sync & 0x1) {
                        /* Enable external pixelclock. This code only for ScreenWonder */
                        *(volatile unsigned short*)0xffff9202 = 0xffbf;
                }
                else {
                        /* Turn off external clocks. Read sets all output bits to 1. */
                        *(volatile unsigned short*)0xffff9202;
                }
                shifter.syncmode = hw->sync;
 
                videl.hht = hw->hht;
                videl.hbb = hw->hbb;
                videl.hbe = hw->hbe;
                videl.hdb = hw->hdb;
                videl.hde = hw->hde;
                videl.hss = hw->hss;
                videl.vft = hw->vft;
                videl.vbb = hw->vbb;
                videl.vbe = hw->vbe;
                videl.vdb = hw->vdb;
                videl.vde = hw->vde;
                videl.vss = hw->vss;
 
                /*f030_sreg[2] = 0;*/
 
                videl.f_shift = 0; /* write enables Falcon palette, 0: 4 planes */
                if (hw->ste_mode) {
                        videl.st_shift = hw->st_shift; /* write enables STE palette */
                }
                else {
                        /* IMPORTANT:
                         * set st_shift 0, so we can tell the screen-depth if f_shift==0.
                         * Writing 0 to f_shift enables 4 plane Falcon mode but
                         * doesn't set st_shift. st_shift!=0 (!=4planes) is impossible
                         * with Falcon palette.
                         */
                        videl.st_shift = 0;
                        /* now back to Falcon palette mode */
                        videl.f_shift = hw->f_shift;
                }
                /* writing to st_shift changed scn_width and vid_mode */
                videl.xoffset = hw->xoffset;
                shifter_f030.scn_width = hw->line_width;
                shifter_f030.off_next = hw->line_offset;
                videl.control = hw->vid_control;
                videl.mode = hw->vid_mode;
        }
        if (f_pan_display) {
                f_pan_display = 0;
                videl.xoffset = current_par.hw.falcon.xoffset;
                shifter_f030.off_next = current_par.hw.falcon.line_offset;
        }
}
 
 
static int falcon_pan_display( struct fb_var_screeninfo *var,
                                                           struct atari_fb_par *par )
{
        int xoffset;
 
        if (disp[currcon].var.bits_per_pixel == 1)
                var->xoffset = up(var->xoffset, 32);
        par->hw.falcon.xoffset = var->xoffset & 15;
        par->hw.falcon.line_offset = disp[currcon].var.bits_per_pixel *
                  (disp[currcon].var.xres_virtual - disp[currcon].var.xres) / 16;
        if (par->hw.falcon.xoffset)
                par->hw.falcon.line_offset -= disp[currcon].var.bits_per_pixel;
        xoffset = var->xoffset - par->hw.falcon.xoffset;
 
        par->screen_base
                = screen_base + (var->yoffset * disp[currcon].var.xres_virtual +
                                xoffset) * disp[currcon].var.bits_per_pixel / 8;
        if (fbhw->set_screen_base)
                fbhw->set_screen_base (par->screen_base);
        else
                return -EINVAL; /* shouldn't happen */
        f_pan_display = 1;
        return 0;
}
 
 
static int falcon_getcolreg( unsigned regno, unsigned *red,
                                 unsigned *green, unsigned *blue,
                                 unsigned *transp )
{       unsigned long col;
 
        if (regno > 255)
                return 1;
        /* This works in STE-mode (with 4bit/color) since f030_col-registers
         * hold up to 6bit/color.
         * Even with hicolor r/g/b=5/6/5 bit!
         */
        col = f030_col[regno];
        *red = (col >> 26) & 0x3f;
        *green = (col >> 18) & 0x3f;
        *blue = (col >> 2) & 0x3f;
        *transp = 0;
        return 0;
}
 
 
static int falcon_setcolreg( unsigned regno, unsigned red,
                                                         unsigned green, unsigned blue,
                                                         unsigned transp )
{
        if (regno > 255)
                return 1;
        f030_col[regno] = (red << 26) | (green << 18) | (blue << 2);
        if (regno < 16) {
                shifter_tt.color_reg[regno] =
                        (((red & 0xe) >> 1) | ((red & 1) << 3) << 8) |
                        (((green & 0xe) >> 1) | ((green & 1) << 3) << 4) |
                        ((blue & 0xe) >> 1) | ((blue & 1) << 3);
                packed16_cmap[regno] = (red << 11) | (green << 5) | blue;
        }
        return 0;
}
 
 
static int falcon_blank( int blank_mode )
{
/* ++guenther: we can switch off graphics by changing VDB and VDE,
 * so VIDEL doesn't hog the bus while saving.
 * (this affects usleep()).
 */
        if (mon_type == F_MON_SM)       /* this doesn't work on SM124 */
                return 1;
        if (blank_mode) {
                /* disable graphics output (this speeds up the CPU) ... */
                videl.vdb = current_par.VFT + 1;
                /* ... and blank all lines */
                videl.hbe = current_par.HHT + 2;
                /* VESA suspend mode, switch off HSYNC */
                if (pwrsave && mon_type == F_MON_VGA)
                        videl.hss = current_par.HHT + 2;
        }
        else {
                videl.vdb = current_par.VDB;
                videl.hbe = current_par.HBE;
                videl.hss = current_par.HSS;
        }
        return 0;
}
 
 
static int falcon_detect( void )
{
        struct atari_fb_par par;
        unsigned char fhw;
 
        /* Determine connected monitor and set monitor parameters */
        fhw = *(unsigned char*)0xffff8006;
        mon_type = fhw >> 6 & 0x3;
        /* bit 1 of fhw: 1=32 bit ram bus, 0=16 bit */
        f030_bus_width = fhw << 6 & 0x80;
        switch (mon_type) {
        case F_MON_SM:
                vfmin = 70;
                vfmax = 72;
                hfmin = 35713;
                hfmax = 35715;
                break;
        case F_MON_SC:
        case F_MON_TV:
                vfmin = 50;
                vfmax = 60;
                hfmin = 15624;
                hfmax = 15626;
                break;
        }
        /* initialize hsync-len */
        f25.hsync = h_syncs[mon_type] / f25.t;
        f32.hsync = h_syncs[mon_type] / f32.t;
        if (fext.t)
                fext.hsync = h_syncs[mon_type] / fext.t;
 
        falcon_get_par(&par);
        falcon_encode_var(&atari_fb_predefined[0], &par);
 
        /* Detected mode is always the "autodetect" slot */
        return 1;
}
 
#endif /* ATAFB_FALCON */
 
/* ------------------- ST(E) specific functions ---------------------- */
 
#ifdef ATAFB_STE
 
static int stste_encode_fix( struct fb_fix_screeninfo *fix,
                                                         struct atari_fb_par *par )
 
{
        int mode, i;
 
        strcpy(fix->id,"Atari Builtin");
        fix->smem_start=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.st.mode & 3;
        if (mode == ST_HIGH) {
                fix->type=FB_TYPE_PACKED_PIXELS;
                fix->type_aux=0;
                fix->visual=FB_VISUAL_MONO10;
        }
        fix->xpanstep = 0;
        if (ATARIHW_PRESENT(EXTD_SHIFTER))
                fix->ypanstep = 1;
        else
                fix->ypanstep = 0;
        fix->ywrapstep = 0;
        fix->line_length = 0;
        for (i=0; i<arraysize(fix->reserved); i++)
                fix->reserved[i]=0;
        return 0;
}
 
 
static int stste_decode_var( struct fb_var_screeninfo *var,
                                                  struct atari_fb_par *par )
{
        int xres=var->xres;
        int yres=var->yres;
        int bpp=var->bits_per_pixel;
        int linelen;
 
        if (mono_moni) {
                if (bpp > 1 || xres > sttt_xres || yres > st_yres)
                        return -EINVAL;
                par->hw.st.mode=ST_HIGH;
                xres=sttt_xres;
                yres=st_yres;
                bpp=1;
        } else {
                if (bpp > 4 || xres > sttt_xres || yres > st_yres)
                        return -EINVAL;
                if (bpp > 2) {
                        if (xres > sttt_xres/2 || yres > st_yres/2)
                                return -EINVAL;
                        par->hw.st.mode=ST_LOW;
                        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.st.mode=ST_MID;
                        xres=sttt_xres;
                        yres=st_yres/2;
                        bpp=2;
                }
                else
                        return -EINVAL;
        }
        if (var->sync & FB_SYNC_EXT)
                par->hw.st.sync=(par->hw.st.sync & ~1) | 1;
        else
                par->hw.st.sync=(par->hw.st.sync & ~1);
        linelen=xres*bpp/8;
        if ((var->yoffset + yres)*linelen > screen_len && screen_len)
                return -EINVAL;
        par->screen_base=screen_base+ var->yoffset*linelen;
        return 0;
}
 
static int stste_encode_var( struct fb_var_screeninfo *var,
                                                  struct atari_fb_par *par )
{
        int linelen, i;
        var->red.offset=0;
        var->red.length = ATARIHW_PRESENT(EXTD_SHIFTER) ? 4 : 3;
        var->red.msb_right=0;
        var->grayscale=0;
 
        var->pixclock=31041;
        var->left_margin=120;           /* these are 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.st.sync & 1))
                var->sync=0;
        else
                var->sync=FB_SYNC_EXT;
 
        switch (par->hw.st.mode & 3) {
        case ST_LOW:
                var->xres=sttt_xres/2;
                var->yres=st_yres/2;
                var->bits_per_pixel=4;
                break;
        case ST_MID:
                var->xres=sttt_xres;
                var->yres=st_yres/2;
                var->bits_per_pixel=2;
                break;
        case ST_HIGH:
                var->xres=sttt_xres;
                var->yres=st_yres;
                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;
        var->xres_virtual=sttt_xres_virtual;
        linelen=var->xres_virtual * var->bits_per_pixel / 8;
        ovsc_addlen=linelen*(sttt_yres_virtual - st_yres);
 
        if (! use_hwscroll)
                var->yres_virtual=var->yres;
        else if (screen_len)
                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;
        for (i=0; i<arraysize(var->reserved); i++)
                var->reserved[i]=0;
        return 0;
}
 
 
static void stste_get_par( struct atari_fb_par *par )
{
        unsigned long addr;
        par->hw.st.mode=shifter_tt.st_shiftmode;
        par->hw.st.sync=shifter.syncmode;
        addr = ((shifter.bas_hi & 0xff) << 16) |
               ((shifter.bas_md & 0xff) << 8);
        if (ATARIHW_PRESENT(EXTD_SHIFTER))
                addr |= (shifter.bas_lo & 0xff);
        par->screen_base = PTOV(addr);
}
 
static void stste_set_par( struct atari_fb_par *par )
{
        shifter_tt.st_shiftmode=par->hw.st.mode;
        shifter.syncmode=par->hw.st.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 stste_getcolreg( unsigned regno, unsigned *red,
                                                        unsigned *green, unsigned *blue,
                                                        unsigned *transp )
{       unsigned col;
 
        if (regno > 15)
                return 1;
        col = shifter_tt.color_reg[regno];
        if (ATARIHW_PRESENT(EXTD_SHIFTER)) {
                *red = ((col >> 7) & 0xe) | ((col >> 11) & 1);
                *green = ((col >> 3) & 0xe) | ((col >> 7) & 1);
                *blue = ((col << 1) & 0xe) | ((col >> 3) & 1);
        }
        else {
                *red = (col >> 8) & 0x7;
                *green = (col >> 4) & 0x7;
                *blue = col & 0x7;
        }
        *transp = 0;
        return 0;
}
 
 
static int stste_setcolreg( unsigned regno, unsigned red,
                                                 unsigned green, unsigned blue,
                                                 unsigned transp )
{
        if (regno > 15)
                return 1;
        if (ATARIHW_PRESENT(EXTD_SHIFTER))
                shifter_tt.color_reg[regno] =
                        (((red & 0xe) >> 1) | ((red & 1) << 3) << 8) |
                        (((green & 0xe) >> 1) | ((green & 1) << 3) << 4) |
                        ((blue & 0xe) >> 1) | ((blue & 1) << 3);
        else
                shifter_tt.color_reg[regno] =
                        ((red & 0x7) << 8) |
                        ((green & 0x7) << 4) |
                        (blue & 0x7);
        return 0;
}
 
 
static int stste_detect( void )
 
{       struct atari_fb_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!
         */
        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;
 
        stste_get_par(&par);
        stste_encode_var(&atari_fb_predefined[0], &par);
 
        if (!ATARIHW_PRESENT(EXTD_SHIFTER))
                use_hwscroll = 0;
        return 1;
}
 
static void stste_set_screen_base(unsigned long s_base)
{
        unsigned long addr;
        addr= VTOP(s_base);
        /* Setup Screen Memory */
        shifter.bas_hi=(unsigned char) ((addr & 0xff0000) >> 16);
        shifter.bas_md=(unsigned char) ((addr & 0x00ff00) >> 8);
        if (ATARIHW_PRESENT(EXTD_SHIFTER))
                shifter.bas_lo=(unsigned char)  (addr & 0x0000ff);
}
 
#endif /* ATAFB_STE */
 
/* Switching the screen size should be done during vsync, otherwise
 * the margins may get messed up. This is a well known problem of
 * the ST's video system.
 *
 * Unfortunately there is hardly any way to find the vsync, as the
 * vertical blank interrupt is no longer in time on machines with
 * overscan type modifications.
 *
 * We can, however, use Timer B to safely detect the black shoulder,
 * but then we've got to guess an appropriate delay to find the vsync.
 * This might not work on every machine.
 *
 * martin_rogge @ ki.maus.de, 8th Aug 1995
 */
 
#define LINE_DELAY  (mono_moni ? 30 : 70)
#define SYNC_DELAY  (mono_moni ? 1500 : 2000)
 
/* SWITCH_ACIA may be used for Falcon (ScreenBlaster III internal!) */
static void st_ovsc_switch(int switchmode)
{
    unsigned long flags;
    register unsigned char old, new;
 
    if ((switchmode & (SWITCH_ACIA | SWITCH_SND6 | SWITCH_SND7)) == 0)
        return;
    save_flags(flags);
    cli();
 
    mfp.tim_ct_b = 0x10;
    mfp.active_edge |= 8;
    mfp.tim_ct_b = 0;
    mfp.tim_dt_b = 0xf0;
    mfp.tim_ct_b = 8;
    while (mfp.tim_dt_b > 1)    /* TOS does it this way, don't ask why */
        ;
    new = mfp.tim_dt_b;
    do {
        udelay(LINE_DELAY);
        old = new;
        new = mfp.tim_dt_b;
    } while (old != new);
    mfp.tim_ct_b = 0x10;
    udelay(SYNC_DELAY);
 
    if (switchmode == SWITCH_ACIA)
        acia.key_ctrl = (ACIA_DIV64|ACIA_D8N1S|ACIA_RHTID|ACIA_RIE);
    else {
        sound_ym.rd_data_reg_sel = 14;
        sound_ym.wd_data = sound_ym.rd_data_reg_sel | switchmode;
    }
    restore_flags(flags);
}
 
/* ------------------- External Video ---------------------- */
 
#ifdef ATAFB_EXT
 
static int ext_encode_fix( struct fb_fix_screeninfo *fix,
                                                   struct atari_fb_par *par )
 
{
        int i;
 
        strcpy(fix->id,"Unknown Extern");
        fix->smem_start=external_addr;
        fix->smem_len=(external_len + PAGE_SIZE -1) & PAGE_MASK;
        if (external_depth == 1) {
                fix->type = FB_TYPE_PACKED_PIXELS;
                /* The letters 'n' and 'i' in the "atavideo=external:" stand
                 * for "normal" and "inverted", rsp., in the monochrome case */
                fix->visual =
                        (external_pmode == FB_TYPE_INTERLEAVED_PLANES ||
                         external_pmode == FB_TYPE_PACKED_PIXELS) ?
                                FB_VISUAL_MONO10 :
                                        FB_VISUAL_MONO01;
        }
        else {
                switch (external_pmode) {
                        /* All visuals are STATIC, because we don't know how to change
                         * colors :-(
                         */
                    case -1:              /* truecolor */
                        fix->type=FB_TYPE_PACKED_PIXELS;
                        fix->visual=FB_VISUAL_TRUECOLOR;
                        break;
                    case FB_TYPE_PACKED_PIXELS:
                        fix->type=FB_TYPE_PACKED_PIXELS;
                        fix->visual=FB_VISUAL_STATIC_PSEUDOCOLOR;
                        break;
                    case FB_TYPE_PLANES:
                        fix->type=FB_TYPE_PLANES;
                        fix->visual=FB_VISUAL_STATIC_PSEUDOCOLOR;
                        break;
                    case FB_TYPE_INTERLEAVED_PLANES:
                        fix->type=FB_TYPE_INTERLEAVED_PLANES;
                        fix->type_aux=2;
                        fix->visual=FB_VISUAL_STATIC_PSEUDOCOLOR;
                        break;
                }
        }
        fix->xpanstep = 0;
        fix->ypanstep = 0;
        fix->ywrapstep = 0;
        fix->line_length = 0;
        for (i=0; i<arraysize(fix->reserved); i++)
                fix->reserved[i]=0;
        return 0;
}
 
 
static int ext_decode_var( struct fb_var_screeninfo *var,
                                                   struct atari_fb_par *par )
{
        struct fb_var_screeninfo *myvar = &atari_fb_predefined[0];
 
        if (var->bits_per_pixel > myvar->bits_per_pixel ||
                var->xres > myvar->xres ||
                var->yres > myvar->yres ||
                var->xoffset > 0 ||
                var->yoffset > 0)
                return -EINVAL;
        return 0;
}
 
 
static int ext_encode_var( struct fb_var_screeninfo *var,
                                                   struct atari_fb_par *par )
{
        int i;
 
        var->red.offset=0;
        var->red.length=(external_pmode == -1) ? external_depth/3 :
                        (external_vgaiobase ? external_bitspercol : 0);
        var->red.msb_right=0;
        var->grayscale=0;
 
        var->pixclock=31041;
        var->left_margin=120;           /* these are surely 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;
 
        var->sync=0;
 
        var->xres = external_xres;
        var->yres = external_yres;
        var->bits_per_pixel = external_depth;
 
        var->blue=var->green=var->red;
        var->transp.offset=0;
        var->transp.length=0;
        var->transp.msb_right=0;
        var->xres_virtual=var->xres;
        var->yres_virtual=var->yres;
        var->xoffset=0;
        var->yoffset=0;
        var->nonstd=0;
        var->activate=0;
        var->vmode=FB_VMODE_NONINTERLACED;
        for (i=0; i<arraysize(var->reserved); i++)
                var->reserved[i]=0;
        return 0;
}
 
 
static void ext_get_par( struct atari_fb_par *par )
{
        par->screen_base = external_addr;
}
 
static void ext_set_par( struct atari_fb_par *par )
{
}
 
#define OUTB(port,val) \
        *((unsigned volatile char *) ((port)+external_vgaiobase))=(val)
#define INB(port) \
        (*((unsigned volatile char *) ((port)+external_vgaiobase)))
#define DACDelay                                \
        do {                                    \
                unsigned char tmp=INB(0x3da);   \
                tmp=INB(0x3da);                 \
        } while (0)
 
static int ext_getcolreg( unsigned regno, unsigned *red,
                                                  unsigned *green, unsigned *blue,
                                                  unsigned *transp )
 
{       unsigned char colmask = (1 << external_bitspercol) - 1;
 
        if (! external_vgaiobase)
                return 1;
 
        switch (external_card_type) {
          case IS_VGA:
            OUTB(0x3c7, regno);
            DACDelay;
            *red=INB(0x3c9) & colmask;
            DACDelay;
            *green=INB(0x3c9) & colmask;
            DACDelay;
            *blue=INB(0x3c9) & colmask;
            DACDelay;
            return 0;
 
          case IS_MV300:
            *red = MV300_color[regno].red;
            *green = MV300_color[regno].green;
            *blue = MV300_color[regno].blue;
            *transp=0;
            return 0;
 
          default:
            return 1;
          }
}
 
static int ext_setcolreg( unsigned regno, unsigned red,
                                                  unsigned green, unsigned blue,
                                                  unsigned transp )
 
{       unsigned char colmask = (1 << external_bitspercol) - 1;
 
        if (! external_vgaiobase)
                return 1;
 
        switch (external_card_type) {
          case IS_VGA:
            OUTB(0x3c8, regno);
            DACDelay;
            OUTB(0x3c9, red & colmask);
            DACDelay;
            OUTB(0x3c9, green & colmask);
            DACDelay;
            OUTB(0x3c9, blue & colmask);
            DACDelay;
            return 0;
 
          case IS_MV300:
            MV300_color[regno].red = red;
            MV300_color[regno].green = green;
            MV300_color[regno].blue = blue;
            OUTB((MV300_reg[regno] << 2)+1, red);
            OUTB((MV300_reg[regno] << 2)+1, green);
            OUTB((MV300_reg[regno] << 2)+1, blue);
            return 0;
 
          default:
            return 1;
          }
}
 
 
static int ext_detect( void )
 
{
        struct fb_var_screeninfo *myvar = &atari_fb_predefined[0];
        struct atari_fb_par dummy_par;
 
        myvar->xres = external_xres;
        myvar->yres = external_yres;
        myvar->bits_per_pixel = external_depth;
        ext_encode_var(myvar, &dummy_par);
        return 1;
}
 
#endif /* ATAFB_EXT */
 
/* ------ This is the same for most hardware types -------- */
 
static void set_screen_base(unsigned long s_base)
{
        unsigned long addr;
        addr= VTOP(s_base);
        /* Setup Screen Memory */
        shifter.bas_hi=(unsigned char) ((addr & 0xff0000) >> 16);
        shifter.bas_md=(unsigned char) ((addr & 0x00ff00) >> 8);
        shifter.bas_lo=(unsigned char)  (addr & 0x0000ff);
}
 
 
static int pan_display( struct fb_var_screeninfo *var,
                        struct atari_fb_par *par )
{
        if (var->xoffset)
                return -EINVAL;
        par->screen_base
                = screen_base + (var->yoffset * disp[currcon].var.xres_virtual
                                                 * disp[currcon].var.bits_per_pixel / 8);
        if (fbhw->set_screen_base)
                fbhw->set_screen_base (par->screen_base);
        else
                return -EINVAL;
        return 0;
}
 
 
/* ------------ Interfaces to hardware functions ------------ */
 
 
#ifdef ATAFB_TT
struct fb_hwswitch tt_switch = {
        tt_detect, tt_encode_fix, tt_decode_var, tt_encode_var,
        tt_get_par, tt_set_par, tt_getcolreg, tt_setcolreg,
        set_screen_base, NULL, pan_display
};
#endif
 
#ifdef ATAFB_FALCON
struct fb_hwswitch falcon_switch = {
        falcon_detect, falcon_encode_fix, falcon_decode_var, falcon_encode_var,
        falcon_get_par, falcon_set_par, falcon_getcolreg,
        falcon_setcolreg, set_screen_base, falcon_blank, falcon_pan_display
};
#endif
 
#ifdef ATAFB_STE
struct fb_hwswitch st_switch = {
        stste_detect, stste_encode_fix, stste_decode_var, stste_encode_var,
        stste_get_par, stste_set_par, stste_getcolreg, stste_setcolreg,
        stste_set_screen_base, NULL, pan_display
};
#endif
 
#ifdef ATAFB_EXT
struct fb_hwswitch ext_switch = {
        ext_detect, ext_encode_fix, ext_decode_var, ext_encode_var,
        ext_get_par, ext_set_par, ext_getcolreg, ext_setcolreg, NULL, NULL, NULL
};
#endif
 
 
 
static void atari_fb_get_par( struct atari_fb_par *par )
{
        if (current_par_valid) {
                *par=current_par;
        }
        else
                fbhw->get_par(par);
}
 
 
static void atari_fb_set_par( struct atari_fb_par *par )
{
        fbhw->set_par(par);
        current_par=*par;
        current_par_valid=1;
}
 
 
 
/* =========================================================== */
/* ============== Hardware Independent Functions ============= */
/* =========================================================== */
 
 
/* used for hardware scrolling */
 
static int
fb_update_var(int con)
{
        int off=disp[con].var.yoffset*disp[con].var.xres_virtual*
                        disp[con].var.bits_per_pixel>>3;
 
        current_par.screen_base=screen_base + off;
 
        if (fbhw->set_screen_base)
                fbhw->set_screen_base(current_par.screen_base);
        return 0;
}
 
static int
do_fb_set_var(struct fb_var_screeninfo *var, int isactive)
{
        int err,activate;
        struct atari_fb_par par;
        if ((err=fbhw->decode_var(var, &par)))
                return err;
        activate=var->activate;
        if (((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) && isactive)
                atari_fb_set_par(&par);
        fbhw->encode_var(var, &par);
        var->activate=activate;
        return 0;
}
 
/* Functions for handling colormap */
 
/* there seems to be a bug in gcc 2.5.8 which inhibits using an other solution */
/* I always get a sigsegv */
 
static short red16[]=
        { 0x0000,0x0000,0x0000,0x0000,0xc000,0xc000,0xc000,0xc000,
          0x8000,0x0000,0x0000,0x0000,0xffff,0xffff,0xffff,0xffff};
static short green16[]=
        { 0x0000,0x0000,0xc000,0xc000,0x0000,0x0000,0xc000,0xc000,
          0x8000,0x0000,0xffff,0xffff,0x0000,0x0000,0xffff,0xffff};
static short blue16[]=
        { 0x0000,0xc000,0x0000,0xc000,0x0000,0xc000,0x0000,0xc000,
          0x8000,0xffff,0x0000,0xffff,0x0000,0xffff,0x0000,0xffff};
 
static short red4[]=
        { 0x0000,0xc000,0x8000,0xffff};
static short green4[]=
        { 0x0000,0xc000,0x8000,0xffff};
static short blue4[]=
        { 0x0000,0xc000,0x8000,0xffff};
 
static short red2[]=
        { 0x0000,0xffff};
static short green2[]=
        { 0x0000,0xffff};
static short blue2[]=
        { 0x0000,0xffff};
 
struct fb_cmap default_16_colors = { 0, 16, red16, green16, blue16, NULL };
struct fb_cmap default_4_colors = { 0, 4, red4, green4, blue4, NULL };
struct fb_cmap default_2_colors = { 0, 2, red2, green2, blue2, NULL };
 
static struct fb_cmap *
get_default_colormap(int bpp)
{
        if (bpp == 1)
                return &default_2_colors;
        if (bpp == 2)
                return &default_4_colors;
        return &default_16_colors;
}
 
#define CNVT_TOHW(val,width)    (((val) << (width)) + 0x7fff - (val)) >> 16
#define CNVT_FROMHW(val,width) ((width)?((((val) << 16) - (val)) / ((1<<(width))-1)):0)
 
 
static int
do_fb_get_cmap(struct fb_cmap *cmap, struct fb_var_screeninfo *var, int kspc)
{
        int i,start;
        unsigned short *red,*green,*blue,*transp;
        unsigned int hred,hgreen,hblue,htransp;
 
        red=cmap->red;
        green=cmap->green;
        blue=cmap->blue;
        transp=cmap->transp;
        start=cmap->start;
        if (start < 0)
                return EINVAL;
        for (i=0 ; i < cmap->len ; i++) {
                if (fbhw->getcolreg(start++, &hred, &hgreen, &hblue, &htransp))
                        return 0;
                hred=CNVT_FROMHW(hred,var->red.length);
                hgreen=CNVT_FROMHW(hgreen,var->green.length);
                hblue=CNVT_FROMHW(hblue,var->blue.length);
                htransp=CNVT_FROMHW(htransp,var->transp.length);
                if (kspc) {
                        *red=hred;
                        *green=hgreen;
                        *blue=hblue;
                        if (transp) *transp=htransp;
                }
                else {
                        put_fs_word(hred, red);
                        put_fs_word(hgreen, green);
                        put_fs_word(hblue, blue);
                        if (transp) put_fs_word(htransp, transp);
                }
                red++;
                green++;
                blue++;
                if (transp) transp++;
        }
        return 0;
}
 
static int
do_fb_set_cmap(struct fb_cmap *cmap, struct fb_var_screeninfo *var, int kspc)
{
        int i,start;
        unsigned short *red,*green,*blue,*transp;
        unsigned int hred,hgreen,hblue,htransp;
 
        red=cmap->red;
        green=cmap->green;
        blue=cmap->blue;
        transp=cmap->transp;
        start=cmap->start;
 
        if (start < 0)
                return -EINVAL;
        for (i=0 ; i < cmap->len ; i++) {
                if (kspc) {
                        hred=*red;
                        hgreen=*green;
                        hblue=*blue;
                        htransp=(transp) ? *transp : 0;
                }
                else {
                        hred=get_fs_word(red);
                        hgreen=get_fs_word(green);
                        hblue=get_fs_word(blue);
                        htransp=(transp)?get_fs_word(transp):0;
                }
                hred=CNVT_TOHW(hred,var->red.length);
                hgreen=CNVT_TOHW(hgreen,var->green.length);
                hblue=CNVT_TOHW(hblue,var->blue.length);
                htransp=CNVT_TOHW(htransp,var->transp.length);
                red++;
                green++;
                blue++;
                if (transp) transp++;
                if (fbhw->setcolreg(start++, hred, hgreen, hblue, htransp))
                        return 0;
        }
        return 0;
}
 
static void
do_install_cmap(int con)
{
        if (con != currcon)
                return;
        if (disp[con].cmap.len)
                do_fb_set_cmap(&disp[con].cmap, &(disp[con].var), 1);
        else
                do_fb_set_cmap(get_default_colormap(
                                disp[con].var.bits_per_pixel), &(disp[con].var), 1);
}
 
static void
memcpy_fs(int fsfromto, void *to, void *from, int len)
{
        switch (fsfromto) {
        case 0:
                memcpy(to,from,len);
                return;
        case 1:
                memcpy_fromfs(to,from,len);
                return;
        case 2:
                memcpy_tofs(to,from,len);
                return;
        }
}
 
static void
copy_cmap(struct fb_cmap *from, struct fb_cmap *to, int fsfromto)
{
        int size;
        int tooff=0, fromoff=0;
 
        if (to->start > from->start)
                fromoff=to->start-from->start;
        else
                tooff=from->start-to->start;
        size=to->len-tooff;
        if (size > from->len-fromoff)
                size=from->len-fromoff;
        if (size < 0)
                return;
        size*=sizeof(unsigned short);
        memcpy_fs(fsfromto, to->red+tooff, from->red+fromoff, size);
        memcpy_fs(fsfromto, to->green+tooff, from->green+fromoff, size);
        memcpy_fs(fsfromto, to->blue+tooff, from->blue+fromoff, size);
        if (from->transp && to->transp)
                memcpy_fs(fsfromto, to->transp+tooff, from->transp+fromoff, size);
}
 
static int
alloc_cmap(struct fb_cmap *cmap,int len,int transp)
{
        int size=len*sizeof(unsigned short);
        if (cmap->len != len) {
                if (cmap->red)
                        kfree(cmap->red);
                if (cmap->green)
                        kfree(cmap->green);
                if (cmap->blue)
                        kfree(cmap->blue);
                if (cmap->transp)
                        kfree(cmap->transp);
                cmap->red=cmap->green=cmap->blue=cmap->transp=NULL;
                cmap->len=0;
                if (! len)
                        return 0;
                if (! (cmap->red=kmalloc(size, GFP_ATOMIC)))
                        return -1;
                if (! (cmap->green=kmalloc(size, GFP_ATOMIC)))
                        return -1;
                if (! (cmap->blue=kmalloc(size, GFP_ATOMIC)))
                        return -1;
                if (transp) {
                        if (! (cmap->transp=kmalloc(size, GFP_ATOMIC)))
                                return -1;
                }
                else
                        cmap->transp=NULL;
        }
        cmap->start=0;
        cmap->len=len;
        copy_cmap(get_default_colormap(len), cmap, 0);
        return 0;
}
 
static int
atari_fb_get_fix(struct fb_fix_screeninfo *fix, int con)
{
        struct atari_fb_par par;
        if (con == -1)
                atari_fb_get_par(&par);
        else
                fbhw->decode_var(&disp[con].var,&par);
        return fbhw->encode_fix(fix, &par);
}
 
static int
atari_fb_get_var(struct fb_var_screeninfo *var, int con)
{
        struct atari_fb_par par;
        if (con == -1) {
                atari_fb_get_par(&par);
                fbhw->encode_var(var, &par);
        }
        else
                *var=disp[con].var;
        return 0;
}
 
static void
atari_fb_set_disp(int con)
{
        struct fb_fix_screeninfo fix;
 
        atari_fb_get_fix(&fix, con);
        if (con == -1)
                con=0;
        disp[con].screen_base = (u_char *)fix.smem_start;
        disp[con].visual = fix.visual;
        disp[con].type = fix.type;
        disp[con].type_aux = fix.type_aux;
        disp[con].ypanstep = fix.ypanstep;
        disp[con].ywrapstep = fix.ywrapstep;
        disp[con].line_length = fix.line_length;
        if (fix.visual != FB_VISUAL_PSEUDOCOLOR &&
                fix.visual != FB_VISUAL_DIRECTCOLOR)
                disp[con].can_soft_blank = 0;
        else
                disp[con].can_soft_blank = 1;
        disp[con].inverse =
            (fix.visual == FB_VISUAL_MONO01 ? !inverse : inverse);
}
 
static int
atari_fb_set_var(struct fb_var_screeninfo *var, int con)
{
        int err,oldxres,oldyres,oldbpp,oldxres_virtual,oldyoffset;
        if ((err=do_fb_set_var(var, con==currcon)))
                return err;
        if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
                oldxres=disp[con].var.xres;
                oldyres=disp[con].var.yres;
                oldxres_virtual=disp[con].var.xres_virtual;
                oldbpp=disp[con].var.bits_per_pixel;
                oldyoffset=disp[con].var.yoffset;
                disp[con].var=*var;
                if (oldxres != var->xres || oldyres != var->yres
                    || oldxres_virtual != var->xres_virtual
                    || oldbpp != var->bits_per_pixel
                    || oldyoffset != var->yoffset) {
                        atari_fb_set_disp(con);
                        (*fb_info.changevar)(con);
                        alloc_cmap(&disp[con].cmap, 0, 0);
                        do_install_cmap(con);
                }
        }
        var->activate=0;
        return 0;
}
 
 
 
static int
atari_fb_get_cmap(struct fb_cmap *cmap, int kspc, int con)
{
        if (con == currcon) /* current console ? */
                return do_fb_get_cmap(cmap, &(disp[con].var), kspc);
        else
                if (disp[con].cmap.len) /* non default colormap ? */
                        copy_cmap(&disp[con].cmap, cmap, kspc ? 0 : 2);
                else
                        copy_cmap(get_default_colormap(
                            disp[con].var.bits_per_pixel), cmap, kspc ? 0 : 2);
        return 0;
}
 
static int
atari_fb_set_cmap(struct fb_cmap *cmap, int kspc, int con)
{
        int err;
        if (! disp[con].cmap.len) { /* no colormap allocated ? */
                if ((err = alloc_cmap(&disp[con].cmap,
                                        1 << disp[con].var.bits_per_pixel, 0)))
                return err;
        }
        if (con == currcon) /* current console ? */
                return do_fb_set_cmap(cmap, &(disp[con].var), kspc);
        else
                copy_cmap(cmap, &disp[con].cmap, kspc ? 0 : 1);
        return 0;
}
 
static int
atari_fb_pan_display(struct fb_var_screeninfo *var, int con)
{
        int xoffset = var->xoffset;
        int yoffset = var->yoffset;
        int err;
 
        if (   xoffset < 0 || xoffset + disp[con].var.xres > disp[con].var.xres_virtual
            || yoffset < 0 || yoffset + disp[con].var.yres > disp[con].var.yres_virtual)
                return -EINVAL;
 
        if (con == currcon) {
                if (fbhw->pan_display) {
                        if ((err = fbhw->pan_display(var, &current_par)))
                                return err;
                }
                else
                        return -EINVAL;
        }
        disp[con].var.xoffset = var->xoffset;
        disp[con].var.yoffset = var->yoffset;
        return 0;
}
 
static int
atari_fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
               unsigned long arg, int con)
{
        int i;
 
        switch (cmd) {
#ifdef FBCMD_GET_CURRENTPAR
        case FBCMD_GET_CURRENTPAR:
                if ((i = verify_area(VERIFY_WRITE, (void *)arg,
                                                         sizeof(struct atari_fb_par))))
                        return i;
                memcpy_tofs((void *)arg, (void *)&current_par,
                                        sizeof(struct atari_fb_par));
                return 0;
#endif
#ifdef FBCMD_SET_CURRENTPAR
        case FBCMD_SET_CURRENTPAR:
                if ((i = verify_area(VERIFY_READ, (void *)arg,
                                                         sizeof(struct atari_fb_par))))
                        return i;
                memcpy_fromfs((void *)&current_par, (void *)arg,
                                        sizeof(struct atari_fb_par));
                atari_fb_set_par(&current_par);
                return 0;
#endif
        }
        return -EINVAL;
}
 
static struct fb_ops atari_fb_ops = {
        atari_fb_get_fix, atari_fb_get_var, atari_fb_set_var, atari_fb_get_cmap,
        atari_fb_set_cmap, atari_fb_pan_display, atari_fb_ioctl
};
 
static void
check_default_par( int detected_mode )
{
        char default_name[10];
        int i;
        struct fb_var_screeninfo var;
        unsigned long min_mem;
 
        /* First try the user supplied mode */
        if (default_par) {
                var=atari_fb_predefined[default_par-1];
                var.activate = FB_ACTIVATE_TEST;
                if (do_fb_set_var(&var,1))
                        default_par=0;           /* failed */
        }
        /* Next is the autodetected one */
        if (! default_par) {
                var=atari_fb_predefined[detected_mode-1]; /* autodetect */
                var.activate = FB_ACTIVATE_TEST;
                if (!do_fb_set_var(&var,1))
                        default_par=detected_mode;
        }
        /* If that also failed, try some default modes... */
        if (! default_par) {
                /* try default1, default2... */
                for (i=1 ; i < 10 ; i++) {
                        sprintf(default_name,"default%d",i);
                        default_par=get_video_mode(default_name);
                        if (! default_par)
                                panic("can't set default video mode\n");
                        var=atari_fb_predefined[default_par-1];
                        var.activate = FB_ACTIVATE_TEST;
                        if (! do_fb_set_var(&var,1))
                                break;  /* ok */
                }
        }
        min_mem=var.xres_virtual * var.yres_virtual * var.bits_per_pixel/8;
        if (default_mem_req < min_mem)
                default_mem_req=min_mem;
}
 
static int
atafb_switch(int con)
{
        /* Do we have to save the colormap ? */
        if (disp[currcon].cmap.len)
                do_fb_get_cmap(&disp[currcon].cmap, &(disp[currcon].var), 1);
        do_fb_set_var(&disp[con].var,1);
        currcon=con;
        /* Install new colormap */
        do_install_cmap(con);
        return 0;
}
 
static void
atafb_blank(int blank)
{
        unsigned short black[16];
        struct fb_cmap cmap;
        if (fbhw->blank && !fbhw->blank(blank))
                return;
        if (blank) {
                memset(black, 0, 16*sizeof(unsigned short));
                cmap.red=black;
                cmap.green=black;
                cmap.blue=black;
                cmap.transp=NULL;
                cmap.start=0;
                cmap.len=16;
                do_fb_set_cmap(&cmap, &(disp[currcon].var), 1);
        }
        else
                do_install_cmap(currcon);
}
 
struct fb_info *
atari_fb_init(long *mem_start)
{
        int err;
        int pad;
        int detected_mode;
        unsigned long mem_req;
        struct fb_var_screeninfo *var;
 
        err=register_framebuffer("Atari Builtin", &node, &atari_fb_ops,
                        num_atari_fb_predefined, atari_fb_predefined);
        if (err < 0)
                panic ("Cannot register frame buffer\n");
        do {
#ifdef ATAFB_EXT
                if (external_addr) {
                        fbhw = &ext_switch;
                        break;
                }
#endif
#ifdef ATAFB_TT
                if (ATARIHW_PRESENT(TT_SHIFTER)) {
                        fbhw = &tt_switch;
                        break;
                }
#endif
#ifdef ATAFB_FALCON
                if (ATARIHW_PRESENT(VIDEL_SHIFTER)) {
                        fbhw = &falcon_switch;
                        add_isr(IRQ_AUTO_4, falcon_vbl_switcher, IRQ_TYPE_PRIO, NULL,
                                        "framebuffer/modeswitch");
                        break;
                }
#endif
#ifdef ATAFB_STE
                if (ATARIHW_PRESENT(STND_SHIFTER) ||
                    ATARIHW_PRESENT(EXTD_SHIFTER)) {
                        fbhw = &st_switch;
                        break;
                }
                fbhw = &st_switch;
                printk("Cannot determine video hardware; defaulting to ST(e)\n");
#else /* ATAFB_STE */
                /* no default driver included */
                /* Nobody will ever see this message :-) */
                panic("Cannot initialize video hardware\n");
#endif
        } while (0);
        detected_mode = fbhw->detect();
        check_default_par(detected_mode);
#ifdef ATAFB_EXT
        if (!external_addr) {
#endif /* ATAFB_EXT */
                mem_req = default_mem_req + ovsc_offset +
                        ovsc_addlen;
                mem_req = ((mem_req + PAGE_SIZE - 1) & PAGE_MASK) + PAGE_SIZE;
                screen_base = (unsigned long) atari_stram_alloc(mem_req, mem_start);
                memset((char *) screen_base, 0, mem_req);
                pad = ((screen_base + PAGE_SIZE-1) & PAGE_MASK) - screen_base;
                screen_base+=pad;
                real_screen_base=screen_base+ovsc_offset;
                screen_len = (mem_req - pad - ovsc_offset) & PAGE_MASK;
                st_ovsc_switch(ovsc_switchmode);
                if (m68k_is040or060) {
                        /* On a '040+, the cache mode of video RAM must be set to
                         * write-through also for internal video hardware! */
                        cache_push( VTOP(screen_base), screen_len );
                        kernel_set_cachemode( screen_base, screen_len,
                                                                  KERNELMAP_NO_COPYBACK );
                }
#ifdef ATAFB_EXT
        }
        else {
                /* Map the video memory (physical address given) to somewhere
                 * in the kernel address space.
                 */
                *mem_start = (*mem_start+PAGE_SIZE-1) & ~(PAGE_SIZE-1);
                external_addr = kernel_map(external_addr, external_len,
                                                                        KERNELMAP_NO_COPYBACK, mem_start);
                if (external_vgaiobase)
                        external_vgaiobase = kernel_map(external_vgaiobase,
                                0x10000, KERNELMAP_NOCACHE_SER, mem_start);
                screen_base      =
                real_screen_base = external_addr;
                screen_len       = external_len & PAGE_MASK;
                memset ((char *) screen_base, 0, external_len);
        }
#endif /* ATAFB_EXT */
 
        strcpy(fb_info.modename, "Atari Builtin ");
        fb_info.disp=disp;
        fb_info.switch_con=&atafb_switch;
        fb_info.updatevar=&fb_update_var;
        fb_info.blank=&atafb_blank;
        var=atari_fb_predefined+default_par-1;
        do_fb_set_var(var,1);
        strcat(fb_info.modename,fb_var_names[default_par-1][0]);
 
        atari_fb_get_var(&disp[0].var, -1);
        atari_fb_set_disp(-1);
        printk("Determined %dx%d, depth %d\n",
               disp[0].var.xres, disp[0].var.yres, disp[0].var.bits_per_pixel );
        do_install_cmap(0);
        return &fb_info;
}
 
/* a strtok which returns empty strings, too */
 
static char * strtoke(char * s,const char * ct)
{
  char *sbegin, *send;
  static char *ssave = NULL;
 
  sbegin  = s ? s : ssave;
  if (!sbegin) {
          return NULL;
  }
  if (*sbegin == '\0') {
    ssave = NULL;
    return NULL;
  }
  send = strpbrk(sbegin, ct);
  if (send && *send != '\0')
    *send++ = '\0';
  ssave = send;
  return sbegin;
}
 
void atari_video_setup( char *options, int *ints )
{
    char *this_opt;
    int temp;
    char ext_str[80], int_str[100];
    char mcap_spec[80];
    char user_mode[80];
 
        ext_str[0]          =
        int_str[0]          =
        mcap_spec[0]        =
        user_mode[0]        =
        fb_info.fontname[0] = '\0';
 
    if (!options || !*options)
                return;
 
    for(this_opt=strtok(options,","); this_opt; this_opt=strtok(NULL,",")) {
        if (!*this_opt) continue;
        if ((temp=get_video_mode(this_opt)))
                default_par=temp;
        else if (! strcmp(this_opt, "inverse"))
                inverse=1;
        else if (!strncmp(this_opt, "font:", 5))
           strcpy(fb_info.fontname, this_opt+5);
        else if (! strncmp(this_opt, "hwscroll_",9)) {
                hwscroll=simple_strtoul(this_opt+9, NULL, 10);
                if (hwscroll < 0)
                        hwscroll = 0;
                if (hwscroll > 200)
                        hwscroll = 200;
        }
        else if (! strncmp(this_opt, "sw_",3)) {
                if (! strcmp(this_opt+3, "acia"))
                        ovsc_switchmode = SWITCH_ACIA;
                else if (! strcmp(this_opt+3, "snd6"))
                        ovsc_switchmode = SWITCH_SND6;
                else if (! strcmp(this_opt+3, "snd7"))
                        ovsc_switchmode = SWITCH_SND7;
                else ovsc_switchmode = SWITCH_NONE;
        }
#ifdef ATAFB_EXT
        else if (!strcmp(this_opt,"mv300")) {
                external_bitspercol = 8;
                external_card_type = IS_MV300;
        }
        else if (!strncmp(this_opt,"external:",9))
                strcpy(ext_str, this_opt+9);
#endif
        else if (!strncmp(this_opt,"internal:",9))
                strcpy(int_str, this_opt+9);
#ifdef ATAFB_FALCON
        else if (!strcmp(this_opt, "pwrsave"))
                pwrsave = 1;
        else if (!strncmp(this_opt, "eclock:", 7)) {
                fext.f = simple_strtoul(this_opt+7, NULL, 10);
                /* external pixelclock in kHz --> ps */
                fext.t = (2000000000UL/fext.f+1)/2;
                fext.f *= 1000;
        }
        else if (!strncmp(this_opt, "monitorcap:", 11))
                strcpy(mcap_spec, this_opt+11);
#endif
        else if (!strcmp(this_opt, "keep"))
                DontCalcRes = 1;
        else if (!strncmp(this_opt, "R", 1))
                strcpy(user_mode, this_opt+1);
    }
 
    if (*int_str) {
        /* Format to config extended internal video hardware like OverScan:
        "<switch-type>,internal:<xres>;<yres>;<xres_max>;<yres_max>;<offset>"
        Explanation:
        <switch-type> type to switch on higher resolution
                        sw_acia : via keyboard ACIA
                        sw_snd6 : via bit 6 of the soundchip port
                        sw_snd7 : via bit 7 of the soundchip port
        <xres>: x-resolution
        <yres>: y-resolution
        The following are only needed if you have an overscan which
        needs a black border:
        <xres_max>: max. length of a line in pixels your OverScan hardware would allow
        <yres_max>: max. number of lines your OverScan hardware would allow
        <offset>: Offset from physical beginning to visible beginning
                  of screen in bytes
        */
        int xres;
        char *p;
 
        if (!(p = strtoke(int_str, ";")) ||!*p) goto int_invalid;
        xres = simple_strtoul(p, NULL, 10);
        if (!(p = strtoke(NULL, ";")) || !*p) goto int_invalid;
        sttt_xres=xres;
        tt_yres=st_yres=simple_strtoul(p, NULL, 10);
        if ((p=strtoke(NULL, ";")) && *p) {
                sttt_xres_virtual=simple_strtoul(p, NULL, 10);
        }
        if ((p=strtoke(NULL, ";")) && *p) {
                sttt_yres_virtual=simple_strtoul(p, NULL, 0);
        }
        if ((p=strtoke(NULL, ";")) && *p) {
                ovsc_offset=simple_strtoul(p, NULL, 0);
        }
 
        if (ovsc_offset || (sttt_yres_virtual != st_yres))
                use_hwscroll=0;
    }
    else
      int_invalid:      ovsc_switchmode = SWITCH_NONE;
 
#ifdef ATAFB_EXT
    if (*ext_str) {
        int             xres, yres, depth, planes;
        unsigned long addr, len;
        char *p;
 
        /* Format is: <xres>;<yres>;<depth>;<plane organ.>;
         *            <screen mem addr>
         *            [;<screen mem length>[;<vgaiobase>[;<colorreg-type>]]]
         */
        if (!(p = strtoke(ext_str, ";")) ||!*p) goto ext_invalid;
        xres = simple_strtoul(p, NULL, 10);
        if (xres <= 0) goto ext_invalid;
 
        if (!(p = strtoke(NULL, ";")) ||!*p) goto ext_invalid;
        yres = simple_strtoul(p, NULL, 10);
        if (yres <= 0) goto ext_invalid;
 
        if (!(p = strtoke(NULL, ";")) ||!*p) goto ext_invalid;
        depth = simple_strtoul(p, NULL, 10);
        if (depth != 1 && depth != 2 && depth != 4 && depth != 8 &&
                depth != 16 && depth != 24) goto ext_invalid;
 
        if (!(p = strtoke(NULL, ";")) ||!*p) goto ext_invalid;
        if (*p == 'i')
                planes = FB_TYPE_INTERLEAVED_PLANES;
        else if (*p == 'p')
                planes = FB_TYPE_PACKED_PIXELS;
        else if (*p == 'n')
                planes = FB_TYPE_PLANES;
        else if (*p == 't')
                planes = -1; /* true color */
        else
                goto ext_invalid;
 
 
        if (!(p = strtoke(NULL, ";")) ||!*p) goto ext_invalid;
        addr = simple_strtoul(p, NULL, 0);
 
        if (!(p = strtoke(NULL, ";")) ||!*p)
                len = xres*yres*depth/8;
        else
                len = simple_strtoul(p, NULL, 0);
 
        if ((p = strtoke(NULL, ";")) && *p)
                external_vgaiobase=simple_strtoul(p, NULL, 0);
 
        if ((p = strtoke(NULL, ";")) && *p) {
                external_bitspercol = simple_strtoul(p, NULL, 0);
                if (external_bitspercol > 8)
                        external_bitspercol = 8;
                else if (external_bitspercol < 1)
                        external_bitspercol = 1;
        }
 
        if ((p = strtoke(NULL, ";")) && *p) {
                if (!strcmp(this_opt, "vga"))
                        external_card_type = IS_VGA;
                if (!strcmp(this_opt, "mv300"))
                        external_card_type = IS_MV300;
        }
 
        external_xres  = xres;
        external_yres  = yres;
        external_depth = depth;
        external_pmode = planes;
        external_addr  = addr;
        external_len   = len;
 
        if (external_card_type == IS_MV300)
          switch (external_depth) {
            case 1:
              MV300_reg = MV300_reg_1bit;
              break;
            case 4:
              MV300_reg = MV300_reg_4bit;
              break;
            case 8:
              MV300_reg = MV300_reg_8bit;
              break;
            }
 
      ext_invalid:
        ;
    }
#endif /* ATAFB_EXT */
 
#ifdef ATAFB_FALCON
    if (*mcap_spec) {
        char *p;
        int vmin, vmax, hmin, hmax;
 
        /* Format for monitor capabilities is: <Vmin>;<Vmax>;<Hmin>;<Hmax>
         * <V*> vertical freq. in Hz
         * <H*> horizontal freq. in kHz
         */
        if (!(p = strtoke(mcap_spec, ";")) || !*p) goto cap_invalid;
        vmin = simple_strtoul(p, NULL, 10);
        if (vmin <= 0) goto cap_invalid;
        if (!(p = strtoke(NULL, ";")) || !*p) goto cap_invalid;
        vmax = simple_strtoul(p, NULL, 10);
        if (vmax <= 0 || vmax <= vmin) goto cap_invalid;
        if (!(p = strtoke(NULL, ";")) || !*p) goto cap_invalid;
        hmin = 1000 * simple_strtoul(p, NULL, 10);
        if (hmin <= 0) goto cap_invalid;
        if (!(p = strtoke(NULL, "")) || !*p) goto cap_invalid;
        hmax = 1000 * simple_strtoul(p, NULL, 10);
        if (hmax <= 0 || hmax <= hmin) goto cap_invalid;
 
        vfmin = vmin;
        vfmax = vmax;
        hfmin = hmin;
        hfmax = hmax;
      cap_invalid:
        ;
    }
#endif
 
        if (*user_mode) {
                /* Format of user defined video mode is: <xres>;<yres>;<depth>
                 */
                char *p;
                int xres, yres, depth, temp;
 
                if (!(p = strtoke(user_mode, ";")) || !*p) goto user_invalid;
                xres = simple_strtoul(p, NULL, 10);
                if (!(p = strtoke(NULL, ";")) || !*p) goto user_invalid;
                yres = simple_strtoul(p, NULL, 10);
                if (!(p = strtoke(NULL, "")) || !*p) goto user_invalid;
                depth = simple_strtoul(p, NULL, 10);
                if ((temp=get_video_mode("user0"))) {
                        default_par=temp;
                        atari_fb_predefined[default_par-1].xres = xres;
                        atari_fb_predefined[default_par-1].yres = yres;
                        atari_fb_predefined[default_par-1].bits_per_pixel = depth;
                }
 
          user_invalid:
                ;
        }
}
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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [m68k/] [atari/] [atafb.c] - Blame information for rev 1777

Line No.	Rev	Author	Line
1	1623	jcastillo	`/*`
2			`* atari/atafb.c -- Low level implementation of Atari frame buffer device`
3			`*`
4			`* Copyright (C) 1994 Martin Schaller & Roman Hodek`
5			`*`
6			`* This file is subject to the terms and conditions of the GNU General Public`
7			`* License. See the file COPYING in the main directory of this archive`
8			`* for more details.`
9			`*`
10			`* History:`
11			`* - 03 Jan 95: Original version by Martin Schaller: The TT driver and`
12			`* all the device independent stuff`
13			`* - 09 Jan 95: Roman: I've added the hardware abstraction (hw_switch)`
14			`* and wrote the Falcon, ST(E), and External drivers`
15			`* based on the original TT driver.`
16			`* - 07 May 95: Martin: Added colormap operations for the external driver`
17			`* - 21 May 95: Martin: Added support for overscan`
18			`* Andreas: some bug fixes for this`
19			`* - Jul 95: Guenther Kelleter <guenther@pool.informatik.rwth-aachen.de>:`
20			`* Programmable Falcon video modes`
21			`* (thanks to Christian Cartus for documentation`
22			`* of VIDEL registers).`
23			`* - 27 Dec 95: Guenther: Implemented user definable video modes "user[0-7]"`
24			`* on minor 24...31. "user0" may be set on commandline by`
25			`* "R<x>;<y>;<depth>". (Makes sense only on Falcon)`
26			`* Video mode switch on Falcon now done at next VBL interrupt`
27			`* to avoid the annoying right shift of the screen.`
28			`*`
29			`*`
30			`* To do:`
31			`* - For the Falcon it is not possible to set random video modes on`
32			`* SM124 and SC/TV, only the bootup resolution is supported.`
33			`*`
34			`*/`
35
36			`#define ATAFB_TT`
37			`#define ATAFB_STE`
38			`#define ATAFB_EXT`
39			`#define ATAFB_FALCON`
40