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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/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <video/maxinefb.h>
/* bootinfo.h defines the machine type values, needed when checking */
/* whether are really running on a maxine, KM */
#include <asm/bootinfo.h>
static struct fb_info fb_info;
static const struct fb_var_screeninfo maxinefb_defined = {
.xres = 1024,
.yres = 768,
.xres_virtual = 1024,
.yres_virtual = 768,
.bits_per_pixel =8,
.activate = FB_ACTIVATE_NOW,
.height = -1,
.width = -1,
.vmode = FB_VMODE_NONINTERLACED,
};
static struct fb_fix_screeninfo maxinefb_fix __initdata = {
.id = "Maxine",
.smem_len = (1024*768),
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_PSEUDOCOLOR,
.line_length = 1024,
};
/* 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);
}
/* Set the palette */
static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp, struct fb_info *info)
{
/* value to be written into the palette reg. */
unsigned long hw_colorvalue = 0;
if (regno > 255)
return 1;
red >>= 8; /* The cmap fields are 16 bits */
green >>= 8; /* wide, but the harware colormap */
blue >>= 8; /* registers are only 8 bits wide */
hw_colorvalue = (blue << 16) + (green << 8) + (red);
maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
hw_colorvalue);
return 0;
}
static const struct fb_ops maxinefb_ops = {
.owner = THIS_MODULE,
FB_DEFAULT_IOMEM_OPS,
.fb_setcolreg = maxinefb_setcolreg,
};
int __init maxinefb_init(void)
{
unsigned long fboff;
unsigned long fb_start;
int i;
if (fb_get_options("maxinefb", NULL))
return -ENODEV;
/* 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++)
*(volatile unsigned char *)fboff = 0x0;
maxinefb_fix.smem_start = fb_start;
/* 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);
*/
}
fb_info.fbops = &maxinefb_ops;
fb_info.screen_base = (char *)maxinefb_fix.smem_start;
fb_info.var = maxinefb_defined;
fb_info.fix = maxinefb_fix;
fb_alloc_cmap(&fb_info.cmap, 256, 0);
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");
#endif
module_init(maxinefb_init);
module_exit(maxinefb_exit);
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