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