linux/drivers/video/q40fb.c
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   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 <asm/uaccess.h>
  22#include <asm/setup.h>
  23#include <asm/q40_master.h>
  24#include <linux/fb.h>
  25#include <linux/module.h>
  26#include <asm/pgtable.h>
  27
  28#define Q40_PHYS_SCREEN_ADDR 0xFE800000
  29
  30static struct fb_fix_screeninfo q40fb_fix = {
  31        .id             = "Q40",
  32        .smem_len       = 1024*1024,
  33        .type           = FB_TYPE_PACKED_PIXELS,
  34        .visual         = FB_VISUAL_TRUECOLOR,
  35        .line_length    = 1024*2,
  36        .accel          = FB_ACCEL_NONE,
  37};
  38
  39static struct fb_var_screeninfo q40fb_var = {
  40        .xres           = 1024,
  41        .yres           = 512,
  42        .xres_virtual   = 1024,
  43        .yres_virtual   = 512,
  44        .bits_per_pixel = 16,
  45        .red            = {6, 5, 0},
  46        .green          = {11, 5, 0},
  47        .blue           = {0, 6, 0},
  48        .activate       = FB_ACTIVATE_NOW,
  49        .height         = 230,
  50        .width          = 300,
  51        .vmode          = FB_VMODE_NONINTERLACED,
  52};
  53
  54static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
  55                           unsigned blue, unsigned transp,
  56                           struct fb_info *info)
  57{
  58    /*
  59     *  Set a single color register. The values supplied have a 16 bit
  60     *  magnitude.
  61     *  Return != 0 for invalid regno.
  62     */
  63
  64    if (regno > 255)
  65            return 1;
  66    red>>=11;
  67    green>>=11;
  68    blue>>=10;
  69
  70    if (regno < 16) {
  71        ((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
  72                                               ((green & 31) << 11) |
  73                                               (blue & 63);
  74    }
  75    return 0;
  76}
  77
  78static struct fb_ops q40fb_ops = {
  79        .owner          = THIS_MODULE,
  80        .fb_setcolreg   = q40fb_setcolreg,
  81        .fb_fillrect    = cfb_fillrect,
  82        .fb_copyarea    = cfb_copyarea,
  83        .fb_imageblit   = cfb_imageblit,
  84};
  85
  86static int q40fb_probe(struct platform_device *dev)
  87{
  88        struct fb_info *info;
  89
  90        if (!MACH_IS_Q40)
  91                return -ENXIO;
  92
  93        /* mapped in q40/config.c */
  94        q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
  95
  96        info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
  97        if (!info)
  98                return -ENOMEM;
  99
 100        info->var = q40fb_var;
 101        info->fix = q40fb_fix;
 102        info->fbops = &q40fb_ops;
 103        info->flags = FBINFO_DEFAULT;  /* not as module for now */
 104        info->pseudo_palette = info->par;
 105        info->par = NULL;
 106        info->screen_base = (char *) q40fb_fix.smem_start;
 107
 108        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 109                framebuffer_release(info);
 110                return -ENOMEM;
 111        }
 112
 113        master_outb(3, DISPLAY_CONTROL_REG);
 114
 115        if (register_framebuffer(info) < 0) {
 116                printk(KERN_ERR "Unable to register Q40 frame buffer\n");
 117                fb_dealloc_cmap(&info->cmap);
 118                framebuffer_release(info);
 119                return -EINVAL;
 120        }
 121
 122        printk(KERN_INFO "fb%d: Q40 frame buffer alive and kicking !\n",
 123               info->node);
 124        return 0;
 125}
 126
 127static struct platform_driver q40fb_driver = {
 128        .probe  = q40fb_probe,
 129        .driver = {
 130                .name   = "q40fb",
 131        },
 132};
 133
 134static struct platform_device q40fb_device = {
 135        .name   = "q40fb",
 136};
 137
 138int __init q40fb_init(void)
 139{
 140        int ret = 0;
 141
 142        if (fb_get_options("q40fb", NULL))
 143                return -ENODEV;
 144
 145        ret = platform_driver_register(&q40fb_driver);
 146
 147        if (!ret) {
 148                ret = platform_device_register(&q40fb_device);
 149                if (ret)
 150                        platform_driver_unregister(&q40fb_driver);
 151        }
 152        return ret;
 153}
 154
 155module_init(q40fb_init);
 156MODULE_LICENSE("GPL");
 157
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