drivers/video/fbdev/sunxvr1000.c

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