kernel/drivers/video/fbdev/sunxvr1000.c

   1 /* sunxvr1000.c: Sun XVR-1000 driver for sparc64 systems
   2  *
   3  * Copyright (C) 2010 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/kernel.h>
   8 #include <linux/fb.h>
   9 #include <linux/init.h>
  10 #include <linux/of_device.h>
  11
  12 struct gfb_info {
  13         struct fb_info          *info;
  14
  15         char __iomem            *fb_base;
  16         unsigned long           fb_base_phys;
  17
  18         struct device_node      *of_node;
  19
  20         unsigned int            width;
  21         unsigned int            height;
  22         unsigned int            depth;
  23         unsigned int            fb_size;
  24
  25         u32                     pseudo_palette[16];
  26 };
  27
  28 static int gfb_get_props(struct gfb_info *gp)
  29 {
  30         gp->width = of_getintprop_default(gp->of_node, "width", 0);
  31         gp->height = of_getintprop_default(gp->of_node, "height", 0);
  32         gp->depth = of_getintprop_default(gp->of_node, "depth", 32);
  33
  34         if (!gp->width || !gp->height) {
  35                 printk(KERN_ERR "gfb: Critical properties missing for %s\n",
  36                        gp->of_node->full_name);
  37                 return -EINVAL;
  38         }
  39
  40         return 0;
  41 }
  42
  43 static int gfb_setcolreg(unsigned regno,
  44                          unsigned red, unsigned green, unsigned blue,
  45                          unsigned transp, struct fb_info *info)
  46 {
  47         u32 value;
  48
  49         if (regno < 16) {
  50                 red >>= 8;
  51                 green >>= 8;
  52                 blue >>= 8;
  53
  54                 value = (blue << 16) | (green << 8) | red;
  55                 ((u32 *)info->pseudo_palette)[regno] = value;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static struct fb_ops gfb_ops = {
  62         .owner                  = THIS_MODULE,
  63         .fb_setcolreg           = gfb_setcolreg,
  64         .fb_fillrect            = cfb_fillrect,
  65         .fb_copyarea            = cfb_copyarea,
  66         .fb_imageblit           = cfb_imageblit,
  67 };
  68
  69 static int gfb_set_fbinfo(struct gfb_info *gp)
  70 {
  71         struct fb_info *info = gp->info;
  72         struct fb_var_screeninfo *var = &info->var;
  73
  74         info->flags = FBINFO_DEFAULT;
  75         info->fbops = &gfb_ops;
  76         info->screen_base = gp->fb_base;
  77         info->screen_size = gp->fb_size;
  78
  79         info->pseudo_palette = gp->pseudo_palette;
  80
  81         /* Fill fix common fields */
  82         strlcpy(info->fix.id, "gfb", sizeof(info->fix.id));
  83         info->fix.smem_start = gp->fb_base_phys;
  84         info->fix.smem_len = gp->fb_size;
  85         info->fix.type = FB_TYPE_PACKED_PIXELS;
  86         if (gp->depth == 32 || gp->depth == 24)
  87                 info->fix.visual = FB_VISUAL_TRUECOLOR;
  88         else
  89                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  90
  91         var->xres = gp->width;
  92         var->yres = gp->height;
  93         var->xres_virtual = var->xres;
  94         var->yres_virtual = var->yres;
  95         var->bits_per_pixel = gp->depth;
  96
  97         var->red.offset = 0;
  98         var->red.length = 8;
  99         var->green.offset = 8;
 100         var->green.length = 8;
 101         var->blue.offset = 16;
 102         var->blue.length = 8;
 103         var->transp.offset = 0;
 104         var->transp.length = 0;
 105
 106         if (fb_alloc_cmap(&info->cmap, 256, 0)) {
 107                 printk(KERN_ERR "gfb: Cannot allocate color map.\n");
 108                 return -ENOMEM;
 109         }
 110
 111         return 0;
 112 }
 113
 114 static int gfb_probe(struct platform_device *op)
 115 {
 116         struct device_node *dp = op->dev.of_node;
 117         struct fb_info *info;
 118         struct gfb_info *gp;
 119         int err;
 120
 121         info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
 122         if (!info) {
 123                 printk(KERN_ERR "gfb: Cannot allocate fb_info\n");
 124                 err = -ENOMEM;
 125                 goto err_out;
 126         }
 127
 128         gp = info->par;
 129         gp->info = info;
 130         gp->of_node = dp;
 131
 132         gp->fb_base_phys = op->resource[6].start;
 133
 134         err = gfb_get_props(gp);
 135         if (err)
 136                 goto err_release_fb;
 137
 138         /* Framebuffer length is the same regardless of resolution. */
 139         info->fix.line_length = 16384;
 140         gp->fb_size = info->fix.line_length * gp->height;
 141
 142         gp->fb_base = of_ioremap(&op->resource[6], 0,
 143                                  gp->fb_size, "gfb fb");
 144         if (!gp->fb_base) {
 145                 err = -ENOMEM;
 146                 goto err_release_fb;
 147         }
 148
 149         err = gfb_set_fbinfo(gp);
 150         if (err)
 151                 goto err_unmap_fb;
 152
 153         printk("gfb: Found device at %s\n", dp->full_name);
 154
 155         err = register_framebuffer(info);
 156         if (err < 0) {
 157                 printk(KERN_ERR "gfb: Could not register framebuffer %s\n",
 158                        dp->full_name);
 159                 goto err_unmap_fb;
 160         }
 161
 162         dev_set_drvdata(&op->dev, info);
 163
 164         return 0;
 165
 166 err_unmap_fb:
 167         of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
 168
 169 err_release_fb:
 170         framebuffer_release(info);
 171
 172 err_out:
 173         return err;
 174 }
 175
 176 static int gfb_remove(struct platform_device *op)
 177 {
 178         struct fb_info *info = dev_get_drvdata(&op->dev);
 179         struct gfb_info *gp = info->par;
 180
 181         unregister_framebuffer(info);
 182
 183         iounmap(gp->fb_base);
 184
 185         of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
 186
 187         framebuffer_release(info);
 188
 189         return 0;
 190 }
 191
 192 static const struct of_device_id gfb_match[] = {
 193         {
 194                 .name = "SUNW,gfb",
 195         },
 196         {},
 197 };
 198 MODULE_DEVICE_TABLE(of, ffb_match);
 199
 200 static struct platform_driver gfb_driver = {
 201         .probe          = gfb_probe,
 202         .remove         = gfb_remove,
 203         .driver = {
 204                 .name           = "gfb",
 205                 .of_match_table = gfb_match,
 206         },
 207 };
 208
 209 static int __init gfb_init(void)
 210 {
 211         if (fb_get_options("gfb", NULL))
 212                 return -ENODEV;
 213
 214         return platform_driver_register(&gfb_driver);
 215 }
 216
 217 static void __exit gfb_exit(void)
 218 {
 219         platform_driver_unregister(&gfb_driver);
 220 }
 221
 222 module_init(gfb_init);
 223 module_exit(gfb_exit);
 224
 225 MODULE_DESCRIPTION("framebuffer driver for Sun XVR-1000 graphics");
 226 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 227 MODULE_VERSION("1.0");
 228 MODULE_LICENSE("GPL");