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/*
* linux/drivers/video/maxinefb.c
*
* DECstation 5000/xx onboard framebuffer support ... derived from:
* "HP300 Topcat framebuffer support (derived from macfb of all things)
* Phil Blundell <philb@gnu.org> 1998", the original code can be
* found in the file hpfb.c in the same directory.
*
* DECstation related code Copyright (C) 1999,2000,2001 by
* Michael Engel <engel@unix-ag.org> and
* Karsten Merker <merker@linuxtag.org>.
* 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.
*
*/
/*
* Changes:
* 2001/01/27 removed debugging and testing code, fixed fb_ops
* initialization which had caused a crash before,
* general cleanup, first official release (KM)
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <video/fbcon.h>
#include "maxinefb.h"
/* bootinfo.h defines the machine type values, needed when checking */
/* whether are really running on a maxine, KM */
#include <asm/bootinfo.h>
#include <video/fbcon-mfb.h>
#include <video/fbcon-cfb2.h>
#include <video/fbcon-cfb4.h>
#include <video/fbcon-cfb8.h>
#define arraysize(x) (sizeof(x)/sizeof(*(x)))
static struct display disp;
static struct fb_info fb_info;
unsigned long fb_start, fb_size = 1024 * 768, fb_line_length = 1024;
unsigned long fb_regs;
unsigned char fb_bitmask;
static struct fb_var_screeninfo maxinefb_defined = {
0, 0, 0, 0, /* W,H, W, H (virtual) load xres,xres_virtual */
0, 0, /* virtual -> visible no offset */
0, /* depth -> load bits_per_pixel */
0, /* greyscale ? */
{0, 0, 0}, /* R */
{0, 0, 0}, /* G */
{0, 0, 0}, /* B */
{0, 0, 0}, /* transparency */
0, /* standard pixel format */
FB_ACTIVATE_NOW,
274, 195, /* 14" monitor */
FB_ACCEL_NONE,
0L, 0L, 0L, 0L, 0L,
0L, 0L, 0, /* No sync info */
FB_VMODE_NONINTERLACED,
{0, 0, 0, 0, 0, 0}
};
struct maxinefb_par {
};
static int currcon = 0;
struct maxinefb_par current_par;
/* Reference to machine type set in arch/mips/dec/prom/identify.c, KM */
extern unsigned long mips_machtype;
/* Handle the funny Inmos RamDAC/video controller ... */
void maxinefb_ims332_write_register(int regno, register unsigned int val)
{
register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
unsigned char *wptr;
wptr = regs + 0xa0000 + (regno << 4);
*((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
*((volatile unsigned short *) (wptr)) = val;
}
unsigned int maxinefb_ims332_read_register(int regno)
{
register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
unsigned char *rptr;
register unsigned int j, k;
rptr = regs + 0x80000 + (regno << 4);
j = *((volatile unsigned short *) rptr);
k = *((volatile unsigned short *) regs);
return (j & 0xffff) | ((k & 0xff00) << 8);
}
static void maxinefb_encode_var(struct fb_var_screeninfo *var,
struct maxinefb_par *par)
{
int i = 0;
var->xres = 1024;
var->yres = 768;
var->xres_virtual = 1024;
var->yres_virtual = 768;
var->xoffset = 0;
var->yoffset = 0;
var->bits_per_pixel = 8;
var->grayscale = 0;
var->transp.offset = 0;
var->transp.length = 0;
var->transp.msb_right = 0;
var->nonstd = 0;
var->activate = 1;
var->height = -1;
var->width = -1;
var->vmode = FB_VMODE_NONINTERLACED;
var->pixclock = 0;
var->sync = 0;
var->left_margin = 0;
var->right_margin = 0;
var->upper_margin = 0;
var->lower_margin = 0;
var->hsync_len = 0;
var->vsync_len = 0;
for (i = 0; i < arraysize(var->reserved); i++)
var->reserved[i] = 0;
}
static void maxinefb_get_par(struct maxinefb_par *par)
{
*par = current_par;
}
static int maxinefb_fb_update_var(int con, struct fb_info *info)
{
return 0;
}
static int maxinefb_do_fb_set_var(struct fb_var_screeninfo *var,
int isactive)
{
struct maxinefb_par par;
maxinefb_get_par(&par);
maxinefb_encode_var(var, &par);
return 0;
}
/* Get the palette */
static int maxinefb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
struct fb_info *info)
{
unsigned int i;
unsigned long hw_colorvalue = 0; /* raw color value from the register */
unsigned int length;
if (((cmap->start) + (cmap->len)) >= 256) {
length = 256 - (cmap->start);
} else {
length = cmap->len;
}
for (i = 0; i < length; i++) {
hw_colorvalue =
maxinefb_ims332_read_register(IMS332_REG_COLOR_PALETTE
+ cmap->start + i);
(cmap->red[i]) = ((hw_colorvalue & 0x0000ff));
(cmap->green[i]) = ((hw_colorvalue & 0x00ff00) >> 8);
(cmap->blue[i]) = ((hw_colorvalue & 0xff0000) >> 16);
}
return 0;
}
/* Set the palette */
static int maxinefb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
struct fb_info *info)
{
unsigned int i;
unsigned long hw_colorvalue; /* value to be written into the palette reg. */
unsigned short cmap_red;
unsigned short cmap_green;
unsigned short cmap_blue;
unsigned int length;
hw_colorvalue = 0;
if (((cmap->start) + (cmap->len)) >= 256) {
length = 256 - (cmap->start);
} else {
length = cmap->len;
}
for (i = 0; i < length; i++) {
cmap_red = ((cmap->red[i]) >> 8); /* The cmap fields are 16 bits */
cmap_green = ((cmap->green[i]) >> 8); /* wide, but the harware colormap */
cmap_blue = ((cmap->blue[i]) >> 8); /* registers are only 8 bits wide */
hw_colorvalue =
(cmap_blue << 16) + (cmap_green << 8) + (cmap_red);
maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE +
cmap->start + i,
hw_colorvalue);
}
return 0;
}
static int maxinefb_get_var(struct fb_var_screeninfo *var, int con,
struct fb_info *info)
{
struct maxinefb_par par;
if (con == -1) {
maxinefb_get_par(&par);
maxinefb_encode_var(var, &par);
} else
*var = fb_display[con].var;
return 0;
}
static int maxinefb_set_var(struct fb_var_screeninfo *var, int con,
struct fb_info *info)
{
int err;
if ((err = maxinefb_do_fb_set_var(var, 1)))
return err;
return 0;
}
static void maxinefb_encode_fix(struct fb_fix_screeninfo *fix,
struct maxinefb_par *par)
{
memset(fix, 0, sizeof(struct fb_fix_screeninfo));
strcpy(fix->id, "maxinefb");
/* fix->id is a char[16], so a maximum of 15 characters, KM */
fix->smem_start = (char *) fb_start; /* display memory base address, KM */
fix->smem_len = fb_size;
fix->type = FB_TYPE_PACKED_PIXELS;
fix->visual = FB_VISUAL_PSEUDOCOLOR;
fix->xpanstep = 0;
fix->ypanstep = 0;
fix->ywrapstep = 0;
fix->line_length = fb_line_length;
}
static int maxinefb_get_fix(struct fb_fix_screeninfo *fix, int con,
struct fb_info *info)
{
struct maxinefb_par par;
maxinefb_get_par(&par);
maxinefb_encode_fix(fix, &par);
return 0;
}
static int maxinefb_switch(int con, struct fb_info *info)
{
maxinefb_do_fb_set_var(&fb_display[con].var, 1);
currcon = con;
return 0;
}
static void maxinefb_set_disp(int con)
{
struct fb_fix_screeninfo fix;
struct display *display;
if (con >= 0)
display = &fb_display[con];
else
display = &disp; /* used during initialization */
maxinefb_get_fix(&fix, con, 0);
display->screen_base = fix.smem_start;
display->visual = fix.visual;
display->type = fix.type;
display->type_aux = fix.type_aux;
display->ypanstep = fix.ypanstep;
display->ywrapstep = fix.ywrapstep;
display->line_length = fix.line_length;
display->next_line = fix.line_length;
display->can_soft_blank = 0;
display->inverse = 0;
display->dispsw = &fbcon_cfb8;
}
static struct fb_ops maxinefb_ops = {
owner: THIS_MODULE,
fb_get_fix: maxinefb_get_fix,
fb_get_var: maxinefb_get_var,
fb_set_var: maxinefb_set_var,
fb_get_cmap: maxinefb_get_cmap,
fb_set_cmap: maxinefb_set_cmap,
};
int __init maxinefb_init(void)
{
volatile unsigned char *fboff;
int i;
/* Validate we're on the proper machine type */
if (mips_machtype != MACH_DS5000_XX) {
return -EINVAL;
}
printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
/* Framebuffer display memory base address */
fb_start = DS5000_xx_ONBOARD_FBMEM_START;
/* Clear screen */
for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
*fboff = 0x0;
/* erase hardware cursor */
for (i = 0; i < 512; i++) {
maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
0);
/*
if (i&0x8 == 0)
maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
else
maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
*/
}
/* Fill in the available video resolution */
maxinefb_defined.xres = 1024;
maxinefb_defined.yres = 768;
maxinefb_defined.xres_virtual = 1024;
maxinefb_defined.yres_virtual = 768;
maxinefb_defined.bits_per_pixel = 8;
/* Let there be consoles... */
strcpy(fb_info.modename, "Maxine onboard graphics 1024x768x8");
/* fb_info.modename: maximum of 39 characters + trailing nullbyte, KM */
fb_info.changevar = NULL;
fb_info.node = -1;
fb_info.fbops = &maxinefb_ops;
fb_info.disp = &disp;
fb_info.switch_con = &maxinefb_switch;
fb_info.updatevar = &maxinefb_fb_update_var;
fb_info.blank = NULL;
fb_info.flags = FBINFO_FLAG_DEFAULT;
maxinefb_do_fb_set_var(&maxinefb_defined, 1);
maxinefb_get_var(&disp.var, -1, &fb_info);
maxinefb_set_disp(-1);
if (register_framebuffer(&fb_info) < 0)
return 1;
return 0;
}
static void __exit maxinefb_exit(void)
{
unregister_framebuffer(&fb_info);
}
#ifdef MODULE
MODULE_LICENSE("GPL");
module_init(maxinefb_init);
#endif
module_exit(maxinefb_exit);
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