linux/drivers/video/fbdev/sunxvr1000.c
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   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
  13struct 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
  29static 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
  44static 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
  62static 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
  70static 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
 115static 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
 167err_unmap_fb:
 168        of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
 169
 170err_release_fb:
 171        framebuffer_release(info);
 172
 173err_out:
 174        return err;
 175}
 176
 177static const struct of_device_id gfb_match[] = {
 178        {
 179                .name = "SUNW,gfb",
 180        },
 181        {},
 182};
 183
 184static 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
 193static 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}
 200device_initcall(gfb_init);
 201