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