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
  32 static 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
  41 static 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
  56 static 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
  80 static 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
  88 static 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) * 256, &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
 129 static struct platform_driver q40fb_driver = {
 130         .probe  = q40fb_probe,
 131         .driver = {
 132                 .name   = "q40fb",
 133         },
 134 };
 135
 136 static struct platform_device q40fb_device = {
 137         .name   = "q40fb",
 138 };
 139
 140 int __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
 157 module_init(q40fb_init);
 158 MODULE_LICENSE("GPL");