linux/drivers/video/sunxvr1000.c
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   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
  12struct 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
  28static 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
  43static 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
  61static 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
  69static 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
 114static 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
 166err_unmap_fb:
 167        of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
 168
 169err_release_fb:
 170        framebuffer_release(info);
 171
 172err_out:
 173        return err;
 174}
 175
 176static 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        dev_set_drvdata(&op->dev, NULL);
 190
 191        return 0;
 192}
 193
 194static const struct of_device_id gfb_match[] = {
 195        {
 196                .name = "SUNW,gfb",
 197        },
 198        {},
 199};
 200MODULE_DEVICE_TABLE(of, ffb_match);
 201
 202static struct platform_driver gfb_driver = {
 203        .probe          = gfb_probe,
 204        .remove         = gfb_remove,
 205        .driver = {
 206                .name           = "gfb",
 207                .owner          = THIS_MODULE,
 208                .of_match_table = gfb_match,
 209        },
 210};
 211
 212static int __init gfb_init(void)
 213{
 214        if (fb_get_options("gfb", NULL))
 215                return -ENODEV;
 216
 217        return platform_driver_register(&gfb_driver);
 218}
 219
 220static void __exit gfb_exit(void)
 221{
 222        platform_driver_unregister(&gfb_driver);
 223}
 224
 225module_init(gfb_init);
 226module_exit(gfb_exit);
 227
 228MODULE_DESCRIPTION("framebuffer driver for Sun XVR-1000 graphics");
 229MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 230MODULE_VERSION("1.0");
 231MODULE_LICENSE("GPL");
 232
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