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/*
* framebuffer driver for VBE 2.0 compliant graphic boards
*
* switching to graphics mode happens at boot time (while
* running in real mode, see arch/i386/boot/video.S).
*
* (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
*
*/
#include <linuxcomp.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#ifdef __i386__
#include <video/edid.h>
#endif
#include <asm/io.h>
#include <asm/mtrr.h>
#define dac_reg (0x3c8)
#define dac_val (0x3c9)
/* --------------------------------------------------------------------- */
static struct fb_var_screeninfo vesafb_defined __initdata
= {
.
activate = FB_ACTIVATE_NOW
,
.
height = -1,
.
width = -1,
.
right_margin = 32,
.
upper_margin = 16,
.
lower_margin = 4,
.
vsync_len = 4,
.
vmode = FB_VMODE_NONINTERLACED
,
};
static struct fb_fix_screeninfo vesafb_fix __initdata
= {
.
id = "VESA VGA",
.
type = FB_TYPE_PACKED_PIXELS
,
.
accel = FB_ACCEL_NONE
,
};
static struct fb_info fb_info
;
static u32 pseudo_palette
[17];
static int inverse
= 0;
static int mtrr
= 1;
static int pmi_setpal
= 0; /* pmi for palette changes ??? */
static int ypan
= 0; /* 0..nothing, 1..ypan, 2..ywrap */
static unsigned short *pmi_base
= 0;
static void (*pmi_start
)(void);
static void (*pmi_pal
)(void);
/* --------------------------------------------------------------------- */
static int vesafb_pan_display
(struct fb_var_screeninfo
*var
,
struct fb_info
*info
)
{
#ifdef __i386__
int offset
;
if (!ypan
)
return -EINVAL
;
if (var
->xoffset
)
return -EINVAL
;
if (var
->yoffset
> var
->yres_virtual
)
return -EINVAL
;
if ((ypan
==1) && var
->yoffset
+var
->yres
> var
->yres_virtual
)
return -EINVAL
;
offset
= (var
->yoffset
* info
->fix.
line_length + var
->xoffset
) / 4;
__asm__ __volatile__
(
"call *(%%edi)"
: /* no return value */
: "a" (0x4f07), /* EAX */
"b" (0), /* EBX */
"c" (offset
), /* ECX */
"d" (offset
>> 16), /* EDX */
"D" (&pmi_start
)); /* EDI */
#endif
return 0;
}
static void vesa_setpalette
(int regno
, unsigned red
, unsigned green
, unsigned blue
)
{
#ifdef __i386__
struct { u_char blue
, green
, red
, pad
; } entry
;
if (pmi_setpal
) {
entry.
red = red
>> 10;
entry.
green = green
>> 10;
entry.
blue = blue
>> 10;
entry.
pad = 0;
__asm__ __volatile__
(
"call *(%%esi)"
: /* no return value */
: "a" (0x4f09), /* EAX */
"b" (0), /* EBX */
"c" (1), /* ECX */
"d" (regno
), /* EDX */
"D" (&entry
), /* EDI */
"S" (&pmi_pal
)); /* ESI */
} else {
/* without protected mode interface, try VGA registers... */
outb_p
(regno
, dac_reg
);
outb_p
(red
>> 10, dac_val
);
outb_p
(green
>> 10, dac_val
);
outb_p
(blue
>> 10, dac_val
);
}
#endif
}
static int vesafb_setcolreg
(unsigned regno
, unsigned red
, unsigned green
,
unsigned blue
, unsigned transp
,
struct fb_info
*info
)
{
/*
* 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.
*/
if (regno
>= info
->cmap.
len)
return 1;
switch (info
->var.
bits_per_pixel) {
case 8:
vesa_setpalette
(regno
,red
,green
,blue
);
break;
case 16:
if (info
->var.
red.
offset == 10) {
/* 1:5:5:5 */
((u32
*) (info
->pseudo_palette
))[regno
] =
((red
& 0xf800) >> 1) |
((green
& 0xf800) >> 6) |
((blue
& 0xf800) >> 11);
} else {
/* 0:5:6:5 */
((u32
*) (info
->pseudo_palette
))[regno
] =
((red
& 0xf800) ) |
((green
& 0xfc00) >> 5) |
((blue
& 0xf800) >> 11);
}
break;
case 24:
red
>>= 8;
green
>>= 8;
blue
>>= 8;
((u32
*)(info
->pseudo_palette
))[regno
] =
(red
<< info
->var.
red.
offset) |
(green
<< info
->var.
green.
offset) |
(blue
<< info
->var.
blue.
offset);
break;
case 32:
red
>>= 8;
green
>>= 8;
blue
>>= 8;
((u32
*)(info
->pseudo_palette
))[regno
] =
(red
<< info
->var.
red.
offset) |
(green
<< info
->var.
green.
offset) |
(blue
<< info
->var.
blue.
offset);
break;
}
return 0;
}
static struct fb_ops vesafb_ops
= {
.
owner = THIS_MODULE
,
.
fb_setcolreg = vesafb_setcolreg
,
.
fb_pan_display = vesafb_pan_display
,
.
fb_fillrect = cfb_fillrect
,
.
fb_copyarea = cfb_copyarea
,
.
fb_imageblit = cfb_imageblit
,
.
fb_cursor = soft_cursor
,
};
int __init vesafb_setup
(char *options
)
{
char *this_opt
;
if (!options
|| !*options
)
return 0;
while ((this_opt
= strsep
(&options
, ",")) != NULL
) {
if (!*this_opt
) continue;
if (! strcmp(this_opt
, "inverse"))
inverse
=1;
else if (! strcmp(this_opt
, "redraw"))
ypan
=0;
else if (! strcmp(this_opt
, "ypan"))
ypan
=1;
else if (! strcmp(this_opt
, "ywrap"))
ypan
=2;
else if (! strcmp(this_opt
, "vgapal"))
pmi_setpal
=0;
else if (! strcmp(this_opt
, "pmipal"))
pmi_setpal
=1;
else if (! strcmp(this_opt
, "mtrr"))
mtrr
=1;
else if (! strcmp(this_opt
, "nomtrr"))
mtrr
=0;
}
return 0;
}
int __init vesafb_init
(void)
{
int video_cmap_len
;
int i
;
if (screen_info.
orig_video_isVGA != VIDEO_TYPE_VLFB
)
return -ENXIO
;
vesafb_fix.
smem_start = screen_info.
lfb_base;
vesafb_defined.
bits_per_pixel = screen_info.
lfb_depth;
if (15 == vesafb_defined.
bits_per_pixel)
vesafb_defined.
bits_per_pixel = 16;
vesafb_defined.
xres = screen_info.
lfb_width;
vesafb_defined.
yres = screen_info.
lfb_height;
vesafb_fix.
line_length = screen_info.
lfb_linelength;
vesafb_fix.
smem_len = screen_info.
lfb_size * 65536;
vesafb_fix.
visual = (vesafb_defined.
bits_per_pixel == 8) ?
FB_VISUAL_PSEUDOCOLOR
: FB_VISUAL_TRUECOLOR
;
/* limit framebuffer size to 16 MB. Otherwise we'll eat tons of
* kernel address space for nothing if the gfx card has alot of
* memory (>= 128 MB isn't uncommon these days ...) */
if (vesafb_fix.
smem_len > 16 * 1024 * 1024)
vesafb_fix.
smem_len = 16 * 1024 * 1024;
#ifndef __i386__
screen_info.
vesapm_seg = 0;
#endif
if (!request_mem_region
(vesafb_fix.
smem_start, vesafb_fix.
smem_len, "vesafb")) {
printk
(KERN_WARNING
"vesafb: abort, cannot reserve video memory at 0x%lx\n",
vesafb_fix.
smem_start);
/* We cannot make this fatal. Sometimes this comes from magic
spaces our resource handlers simply don't know about */
}
fb_info.
screen_base = ioremap
(vesafb_fix.
smem_start, vesafb_fix.
smem_len);
if (!fb_info.
screen_base) {
release_mem_region
(vesafb_fix.
smem_start, vesafb_fix.
smem_len);
printk
(KERN_ERR
"vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
vesafb_fix.
smem_len, vesafb_fix.
smem_start);
return -EIO
;
}
printk
(KERN_INFO
"vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
vesafb_fix.
smem_start, fb_info.
screen_base, vesafb_fix.
smem_len/1024);
printk
(KERN_INFO
"vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
vesafb_defined.
xres, vesafb_defined.
yres, vesafb_defined.
bits_per_pixel, vesafb_fix.
line_length, screen_info.
pages);
if (screen_info.
vesapm_seg) {
printk
(KERN_INFO
"vesafb: protected mode interface info at %04x:%04x\n",
screen_info.
vesapm_seg,screen_info.
vesapm_off);
}
if (screen_info.
vesapm_seg < 0xc000)
ypan
= pmi_setpal
= 0; /* not available or some DOS TSR ... */
if (ypan
|| pmi_setpal
) {
pmi_base
= (unsigned short*)phys_to_virt
(((unsigned long)screen_info.
vesapm_seg << 4) + screen_info.
vesapm_off);
pmi_start
= (void*)((char*)pmi_base
+ pmi_base
[1]);
pmi_pal
= (void*)((char*)pmi_base
+ pmi_base
[2]);
printk
(KERN_INFO
"vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start
,pmi_pal
);
if (pmi_base
[3]) {
printk
(KERN_INFO
"vesafb: pmi: ports = ");
for (i
= pmi_base
[3]/2; pmi_base
[i
] != 0xffff; i
++)
printk
("%x ",pmi_base
[i
]);
printk
("\n");
if (pmi_base
[i
] != 0xffff) {
/*
* memory areas not supported (yet?)
*
* Rules are: we have to set up a descriptor for the requested
* memory area and pass it in the ES register to the BIOS function.
*/
printk
(KERN_INFO
"vesafb: can't handle memory requests, pmi disabled\n");
ypan
= pmi_setpal
= 0;
}
}
}
vesafb_defined.
xres_virtual = vesafb_defined.
xres;
vesafb_defined.
yres_virtual = vesafb_fix.
smem_len / vesafb_fix.
line_length;
if (ypan
&& vesafb_defined.
yres_virtual > vesafb_defined.
yres) {
printk
(KERN_INFO
"vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
(ypan
> 1) ? "ywrap" : "ypan",vesafb_defined.
yres_virtual);
} else {
printk
(KERN_INFO
"vesafb: scrolling: redraw\n");
vesafb_defined.
yres_virtual = vesafb_defined.
yres;
ypan
= 0;
}
/* some dummy values for timing to make fbset happy */
vesafb_defined.
pixclock = 10000000 / vesafb_defined.
xres * 1000 / vesafb_defined.
yres;
vesafb_defined.
left_margin = (vesafb_defined.
xres / 8) & 0xf8;
vesafb_defined.
hsync_len = (vesafb_defined.
xres / 8) & 0xf8;
if (vesafb_defined.
bits_per_pixel > 8) {
vesafb_defined.
red.
offset = screen_info.
red_pos;
vesafb_defined.
red.
length = screen_info.
red_size;
vesafb_defined.
green.
offset = screen_info.
green_pos;
vesafb_defined.
green.
length = screen_info.
green_size;
vesafb_defined.
blue.
offset = screen_info.
blue_pos;
vesafb_defined.
blue.
length = screen_info.
blue_size;
vesafb_defined.
transp.
offset = screen_info.
rsvd_pos;
vesafb_defined.
transp.
length = screen_info.
rsvd_size;
printk
(KERN_INFO
"vesafb: directcolor: "
"size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
screen_info.
rsvd_size,
screen_info.
red_size,
screen_info.
green_size,
screen_info.
blue_size,
screen_info.
rsvd_pos,
screen_info.
red_pos,
screen_info.
green_pos,
screen_info.
blue_pos);
video_cmap_len
= 16;
} else {
vesafb_defined.
red.
length = 6;
vesafb_defined.
green.
length = 6;
vesafb_defined.
blue.
length = 6;
video_cmap_len
= 256;
}
vesafb_fix.
ypanstep = ypan
? 1 : 0;
vesafb_fix.
ywrapstep = (ypan
>1) ? 1 : 0;
/* request failure does not faze us, as vgacon probably has this
* region already (FIXME) */
request_region
(0x3c0, 32, "vesafb");
if (mtrr
) {
int temp_size
= vesafb_fix.
smem_len;
/* Find the largest power-of-two */
while (temp_size
& (temp_size
- 1))
temp_size
&= (temp_size
- 1);
/* Try and find a power of two to add */
while (temp_size
&& mtrr_add
(vesafb_fix.
smem_start, temp_size
, MTRR_TYPE_WRCOMB
, 1)==-EINVAL
) {
temp_size
>>= 1;
}
}
fb_info.
fbops = &vesafb_ops
;
fb_info.
var = vesafb_defined
;
fb_info.
fix = vesafb_fix
;
fb_info.
pseudo_palette = pseudo_palette
;
fb_info.
flags = FBINFO_FLAG_DEFAULT
;
fb_alloc_cmap
(&fb_info.
cmap, video_cmap_len
, 0);
if (register_framebuffer
(&fb_info
)<0)
return -EINVAL
;
printk
(KERN_INFO
"fb%d: %s frame buffer device\n",
fb_info.
node, fb_info.
fix.
id);
return 0;
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* ---------------------------------------------------------------------------
* Local variables:
* c-basic-offset: 8
* End:
*/
MODULE_LICENSE
("GPL");