cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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q40fb.c (3351B)

      1/*
      2 * linux/drivers/video/q40fb.c -- Q40 frame buffer device
      3 *
      4 * Copyright (C) 2001
      5 *
      6 *      Richard Zidlicky <rz@linux-m68k.org>
      7 *
      8 *  This file is subject to the terms and conditions of the GNU General Public
      9 *  License. See the file COPYING in the main directory of this archive for
     10 *  more details.
     11 */
     12
     13#include <linux/kernel.h>
     14#include <linux/errno.h>
     15#include <linux/string.h>
     16#include <linux/mm.h>
     17#include <linux/delay.h>
     18#include <linux/interrupt.h>
     19#include <linux/platform_device.h>
     20
     21#include <linux/uaccess.h>
     22#include <asm/setup.h>
     23#include <asm/q40_master.h>
     24#include <linux/fb.h>
     25#include <linux/module.h>
     26
     27#define Q40_PHYS_SCREEN_ADDR 0xFE800000
     28
     29static struct fb_fix_screeninfo q40fb_fix = {
     30	.id		= "Q40",
     31	.smem_len	= 1024*1024,
     32	.type		= FB_TYPE_PACKED_PIXELS,
     33	.visual		= FB_VISUAL_TRUECOLOR,
     34	.line_length	= 1024*2,
     35	.accel		= FB_ACCEL_NONE,
     36};
     37
     38static const struct fb_var_screeninfo q40fb_var = {
     39	.xres		= 1024,
     40	.yres		= 512,
     41	.xres_virtual	= 1024,
     42	.yres_virtual	= 512,
     43	.bits_per_pixel	= 16,
     44    	.red		= {6, 5, 0},
     45	.green		= {11, 5, 0},
     46	.blue		= {0, 6, 0},
     47	.activate	= FB_ACTIVATE_NOW,
     48	.height		= 230,
     49	.width		= 300,
     50	.vmode		= FB_VMODE_NONINTERLACED,
     51};
     52
     53static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
     54			   unsigned blue, unsigned transp,
     55			   struct fb_info *info)
     56{
     57    /*
     58     *  Set a single color register. The values supplied have a 16 bit
     59     *  magnitude.
     60     *  Return != 0 for invalid regno.
     61     */
     62
     63    if (regno > 255)
     64	    return 1;
     65    red>>=11;
     66    green>>=11;
     67    blue>>=10;
     68
     69    if (regno < 16) {
     70	((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
     71					       ((green & 31) << 11) |
     72					       (blue & 63);
     73    }
     74    return 0;
     75}
     76
     77static const struct fb_ops q40fb_ops = {
     78	.owner		= THIS_MODULE,
     79	.fb_setcolreg	= q40fb_setcolreg,
     80	.fb_fillrect	= cfb_fillrect,
     81	.fb_copyarea	= cfb_copyarea,
     82	.fb_imageblit	= cfb_imageblit,
     83};
     84
     85static int q40fb_probe(struct platform_device *dev)
     86{
     87	struct fb_info *info;
     88
     89	if (!MACH_IS_Q40)
     90		return -ENXIO;
     91
     92	/* mapped in q40/config.c */
     93	q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
     94
     95	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
     96	if (!info)
     97		return -ENOMEM;
     98
     99	info->var = q40fb_var;
    100	info->fix = q40fb_fix;
    101	info->fbops = &q40fb_ops;
    102	info->flags = FBINFO_DEFAULT;  /* not as module for now */
    103	info->pseudo_palette = info->par;
    104	info->par = NULL;
    105	info->screen_base = (char *) q40fb_fix.smem_start;
    106
    107	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
    108		framebuffer_release(info);
    109		return -ENOMEM;
    110	}
    111
    112	master_outb(3, DISPLAY_CONTROL_REG);
    113
    114	if (register_framebuffer(info) < 0) {
    115		printk(KERN_ERR "Unable to register Q40 frame buffer\n");
    116		fb_dealloc_cmap(&info->cmap);
    117		framebuffer_release(info);
    118		return -EINVAL;
    119	}
    120
    121	fb_info(info, "Q40 frame buffer alive and kicking !\n");
    122	return 0;
    123}
    124
    125static struct platform_driver q40fb_driver = {
    126	.probe	= q40fb_probe,
    127	.driver	= {
    128		.name	= "q40fb",
    129	},
    130};
    131
    132static struct platform_device q40fb_device = {
    133	.name	= "q40fb",
    134};
    135
    136int __init q40fb_init(void)
    137{
    138	int ret = 0;
    139
    140	if (fb_get_options("q40fb", NULL))
    141		return -ENODEV;
    142
    143	ret = platform_driver_register(&q40fb_driver);
    144
    145	if (!ret) {
    146		ret = platform_device_register(&q40fb_device);
    147		if (ret)
    148			platform_driver_unregister(&q40fb_driver);
    149	}
    150	return ret;
    151}
    152
    153module_init(q40fb_init);
    154MODULE_LICENSE("GPL");