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