LXR linux/drivers/video/q40fb.c

   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/slab.h>
  18#include <linux/delay.h>
  19#include <linux/interrupt.h>
  20#include <linux/platform_device.h>
  21
  22#include <asm/uaccess.h>
  23#include <asm/setup.h>
  24#include <asm/system.h>
  25#include <asm/q40_master.h>
  26#include <linux/fb.h>
  27#include <linux/module.h>
  28#include <asm/pgtable.h>
  29
  30#define Q40_PHYS_SCREEN_ADDR 0xFE800000
  31
  32static struct fb_fix_screeninfo q40fb_fix __initdata = {
  33        .id             = "Q40",
  34        .smem_len       = 1024*1024,
  35        .type           = FB_TYPE_PACKED_PIXELS,
  36        .visual         = FB_VISUAL_TRUECOLOR,
  37        .line_length    = 1024*2,
  38        .accel          = FB_ACCEL_NONE,
  39};
  40
  41static struct fb_var_screeninfo q40fb_var __initdata = {
  42        .xres           = 1024,
  43        .yres           = 512,
  44        .xres_virtual   = 1024,
  45        .yres_virtual   = 512,
  46        .bits_per_pixel = 16,
  47        .red            = {6, 5, 0},
  48        .green          = {11, 5, 0},
  49        .blue           = {0, 6, 0},
  50        .activate       = FB_ACTIVATE_NOW,
  51        .height         = 230,
  52        .width          = 300,
  53        .vmode          = FB_VMODE_NONINTERLACED,
  54};
  55
  56static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
  57                           unsigned blue, unsigned transp,
  58                           struct fb_info *info)
  59{
  60    /*
  61     *  Set a single color register. The values supplied have a 16 bit
  62     *  magnitude.
  63     *  Return != 0 for invalid regno.
  64     */
  65
  66    if (regno > 255)
  67            return 1;
  68    red>>=11;
  69    green>>=11;
  70    blue>>=10;
  71
  72    if (regno < 16) {
  73        ((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
  74                                               ((green & 31) << 11) |
  75                                               (blue & 63);
  76    }
  77    return 0;
  78}
  79
  80static struct fb_ops q40fb_ops = {
  81        .owner          = THIS_MODULE,
  82        .fb_setcolreg   = q40fb_setcolreg,
  83        .fb_fillrect    = cfb_fillrect,
  84        .fb_copyarea    = cfb_copyarea,
  85        .fb_imageblit   = cfb_imageblit,
  86};
  87
  88static int __init q40fb_probe(struct platform_device *dev)
  89{
  90        struct fb_info *info;
  91
  92        if (!MACH_IS_Q40)
  93                return -ENXIO;
  94
  95        /* mapped in q40/config.c */
  96        q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
  97
  98        info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
  99        if (!info)
 100                return -ENOMEM;
 101
 102        info->var = q40fb_var;
 103        info->fix = q40fb_fix;
 104        info->fbops = &q40fb_ops;
 105        info->flags = FBINFO_DEFAULT;  /* not as module for now */
 106        info->pseudo_palette = info->par;
 107        info->par = NULL;
 108        info->screen_base = (char *) q40fb_fix.smem_start;
 109
 110        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 111                framebuffer_release(info);
 112                return -ENOMEM;
 113        }
 114
 115        master_outb(3, DISPLAY_CONTROL_REG);
 116
 117        if (register_framebuffer(info) < 0) {
 118                printk(KERN_ERR "Unable to register Q40 frame buffer\n");
 119                fb_dealloc_cmap(&info->cmap);
 120                framebuffer_release(info);
 121                return -EINVAL;
 122        }
 123
 124        printk(KERN_INFO "fb%d: Q40 frame buffer alive and kicking !\n",
 125               info->node);
 126        return 0;
 127}
 128
 129static struct platform_driver q40fb_driver = {
 130        .probe  = q40fb_probe,
 131        .driver = {
 132                .name   = "q40fb",
 133        },
 134};
 135
 136static struct platform_device q40fb_device = {
 137        .name   = "q40fb",
 138};
 139
 140int __init q40fb_init(void)
 141{
 142        int ret = 0;
 143
 144        if (fb_get_options("q40fb", NULL))
 145                return -ENODEV;
 146
 147        ret = platform_driver_register(&q40fb_driver);
 148
 149        if (!ret) {
 150                ret = platform_device_register(&q40fb_device);
 151                if (ret)
 152                        platform_driver_unregister(&q40fb_driver);
 153        }
 154        return ret;
 155}
 156
 157module_init(q40fb_init);
 158MODULE_LICENSE("GPL");
 159