/* *      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 ... */ static 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;} #if 0/* dead code: leave here for hardware interface documentation */static 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);}#endif /* 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,}; static 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 -ENODEV;	return 0;} static void __exit maxinefb_exit(void){	unregister_framebuffer(&fb_info);} module_init(maxinefb_init);module_exit(maxinefb_exit); MODULE_LICENSE("GPL");