cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

maxinefb.c (4697B)

      1/*
      2 *      linux/drivers/video/maxinefb.c
      3 *
      4 *	DECstation 5000/xx onboard framebuffer support ... derived from:
      5 *	"HP300 Topcat framebuffer support (derived from macfb of all things)
      6 *	Phil Blundell <philb@gnu.org> 1998", the original code can be
      7 *      found in the file hpfb.c in the same directory.
      8 *
      9 *      DECstation related code Copyright (C) 1999,2000,2001 by
     10 *      Michael Engel <engel@unix-ag.org> and
     11 *      Karsten Merker <merker@linuxtag.org>.
     12 *      This file is subject to the terms and conditions of the GNU General
     13 *      Public License.  See the file COPYING in the main directory of this
     14 *      archive for more details.
     15 *
     16 */
     17
     18/*
     19 * Changes:
     20 * 2001/01/27 removed debugging and testing code, fixed fb_ops
     21 *            initialization which had caused a crash before,
     22 *            general cleanup, first official release (KM)
     23 *
     24 */
     25
     26#include <linux/module.h>
     27#include <linux/kernel.h>
     28#include <linux/errno.h>
     29#include <linux/string.h>
     30#include <linux/mm.h>
     31#include <linux/delay.h>
     32#include <linux/init.h>
     33#include <linux/fb.h>
     34#include <video/maxinefb.h>
     35
     36/* bootinfo.h defines the machine type values, needed when checking */
     37/* whether are really running on a maxine, KM                       */
     38#include <asm/bootinfo.h>
     39
     40static struct fb_info fb_info;
     41
     42static const struct fb_var_screeninfo maxinefb_defined = {
     43	.xres =		1024,
     44	.yres =		768,
     45	.xres_virtual =	1024,
     46	.yres_virtual =	768,
     47	.bits_per_pixel =8,
     48	.activate =	FB_ACTIVATE_NOW,
     49	.height =	-1,
     50	.width =	-1,
     51	.vmode =	FB_VMODE_NONINTERLACED,
     52};
     53
     54static struct fb_fix_screeninfo maxinefb_fix __initdata = {
     55	.id =		"Maxine",
     56	.smem_len =	(1024*768),
     57	.type =		FB_TYPE_PACKED_PIXELS,
     58	.visual =	FB_VISUAL_PSEUDOCOLOR,
     59	.line_length =	1024,
     60};
     61
     62/* Handle the funny Inmos RamDAC/video controller ... */
     63
     64void maxinefb_ims332_write_register(int regno, register unsigned int val)
     65{
     66	register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
     67	unsigned char *wptr;
     68
     69	wptr = regs + 0xa0000 + (regno << 4);
     70	*((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
     71	*((volatile unsigned short *) (wptr)) = val;
     72}
     73
     74unsigned int maxinefb_ims332_read_register(int regno)
     75{
     76	register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
     77	unsigned char *rptr;
     78	register unsigned int j, k;
     79
     80	rptr = regs + 0x80000 + (regno << 4);
     81	j = *((volatile unsigned short *) rptr);
     82	k = *((volatile unsigned short *) regs);
     83
     84	return (j & 0xffff) | ((k & 0xff00) << 8);
     85}
     86
     87/* Set the palette */
     88static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
     89			      unsigned blue, unsigned transp, struct fb_info *info)
     90{
     91	/* value to be written into the palette reg. */
     92	unsigned long hw_colorvalue = 0;
     93
     94	if (regno > 255)
     95		return 1;
     96
     97	red   >>= 8;    /* The cmap fields are 16 bits    */
     98	green >>= 8;    /* wide, but the harware colormap */
     99	blue  >>= 8;    /* registers are only 8 bits wide */
    100
    101	hw_colorvalue = (blue << 16) + (green << 8) + (red);
    102
    103	maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
    104				       hw_colorvalue);
    105	return 0;
    106}
    107
    108static const struct fb_ops maxinefb_ops = {
    109	.owner		= THIS_MODULE,
    110	.fb_setcolreg	= maxinefb_setcolreg,
    111	.fb_fillrect	= cfb_fillrect,
    112	.fb_copyarea	= cfb_copyarea,
    113	.fb_imageblit	= cfb_imageblit,
    114};
    115
    116int __init maxinefb_init(void)
    117{
    118	unsigned long fboff;
    119	unsigned long fb_start;
    120	int i;
    121
    122	if (fb_get_options("maxinefb", NULL))
    123		return -ENODEV;
    124
    125	/* Validate we're on the proper machine type */
    126	if (mips_machtype != MACH_DS5000_XX) {
    127		return -EINVAL;
    128	}
    129
    130	printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
    131	printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
    132
    133	/* Framebuffer display memory base address */
    134	fb_start = DS5000_xx_ONBOARD_FBMEM_START;
    135
    136	/* Clear screen */
    137	for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
    138		*(volatile unsigned char *)fboff = 0x0;
    139
    140	maxinefb_fix.smem_start = fb_start;
    141	
    142	/* erase hardware cursor */
    143	for (i = 0; i < 512; i++) {
    144		maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
    145					       0);
    146		/*
    147		   if (i&0x8 == 0)
    148		   maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
    149		   else
    150		   maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
    151		 */
    152	}
    153
    154	fb_info.fbops = &maxinefb_ops;
    155	fb_info.screen_base = (char *)maxinefb_fix.smem_start;
    156	fb_info.var = maxinefb_defined;
    157	fb_info.fix = maxinefb_fix;
    158	fb_info.flags = FBINFO_DEFAULT;
    159
    160	fb_alloc_cmap(&fb_info.cmap, 256, 0);
    161
    162	if (register_framebuffer(&fb_info) < 0)
    163		return 1;
    164	return 0;
    165}
    166
    167static void __exit maxinefb_exit(void)
    168{
    169	unregister_framebuffer(&fb_info);
    170}
    171
    172#ifdef MODULE
    173MODULE_LICENSE("GPL");
    174#endif
    175module_init(maxinefb_init);
    176module_exit(maxinefb_exit);
    177