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