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