sunxvr1000.c

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/* sunxvr1000.c: Sun XVR-1000 driver for sparc64 systems
 *
 * Copyright (C) 2010 David S. Miller (davem@davemloft.net)
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/of_device.h>

struct gfb_info {
    struct fb_info      *info;

    char __iomem        *fb_base;
    unsigned long       fb_base_phys;

    struct device_node  *of_node;

    unsigned int        width;
    unsigned int        height;
    unsigned int        depth;
    unsigned int        fb_size;

    u32         pseudo_palette[16];
};

static int __devinit gfb_get_props(struct gfb_info *gp)
{
    gp->width = of_getintprop_default(gp->of_node, "width", 0);
    gp->height = of_getintprop_default(gp->of_node, "height", 0);
    gp->depth = of_getintprop_default(gp->of_node, "depth", 32);

    if (!gp->width || !gp->height) {
        printk(KERN_ERR "gfb: Critical properties missing for %s\n",
               gp->of_node->full_name);
        return -EINVAL;
    }

    return 0;
}

static int gfb_setcolreg(unsigned regno,
             unsigned red, unsigned green, unsigned blue,
             unsigned transp, struct fb_info *info)
{
    u32 value;

    if (regno < 16) {
        red >>= 8;
        green >>= 8;
        blue >>= 8;

        value = (blue << 16) | (green << 8) | red;
        ((u32 *)info->pseudo_palette)[regno] = value;
    }

    return 0;
}

static struct fb_ops gfb_ops = {
    .owner          = THIS_MODULE,
    .fb_setcolreg       = gfb_setcolreg,
    .fb_fillrect        = cfb_fillrect,
    .fb_copyarea        = cfb_copyarea,
    .fb_imageblit       = cfb_imageblit,
};

static int __devinit gfb_set_fbinfo(struct gfb_info *gp)
{
    struct fb_info *info = gp->info;
    struct fb_var_screeninfo *var = &info->var;

    info->flags = FBINFO_DEFAULT;
    info->fbops = &gfb_ops;
    info->screen_base = gp->fb_base;
    info->screen_size = gp->fb_size;

    info->pseudo_palette = gp->pseudo_palette;

    /* Fill fix common fields */
    strlcpy(info->fix.id, "gfb", sizeof(info->fix.id));
        info->fix.smem_start = gp->fb_base_phys;
        info->fix.smem_len = gp->fb_size;
        info->fix.type = FB_TYPE_PACKED_PIXELS;
    if (gp->depth == 32 || gp->depth == 24)
        info->fix.visual = FB_VISUAL_TRUECOLOR;
    else
        info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

    var->xres = gp->width;
    var->yres = gp->height;
    var->xres_virtual = var->xres;
    var->yres_virtual = var->yres;
    var->bits_per_pixel = gp->depth;

    var->red.offset = 0;
    var->red.length = 8;
    var->green.offset = 8;
    var->green.length = 8;
    var->blue.offset = 16;
    var->blue.length = 8;
    var->transp.offset = 0;
    var->transp.length = 0;

    if (fb_alloc_cmap(&info->cmap, 256, 0)) {
        printk(KERN_ERR "gfb: Cannot allocate color map.\n");
        return -ENOMEM;
    }

        return 0;
}

static int __devinit gfb_probe(struct platform_device *op)
{
    struct device_node *dp = op->dev.of_node;
    struct fb_info *info;
    struct gfb_info *gp;
    int err;

    info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
    if (!info) {
        printk(KERN_ERR "gfb: Cannot allocate fb_info\n");
        err = -ENOMEM;
        goto err_out;
    }

    gp = info->par;
    gp->info = info;
    gp->of_node = dp;

    gp->fb_base_phys = op->resource[6].start;

    err = gfb_get_props(gp);
    if (err)
        goto err_release_fb;

    /* Framebuffer length is the same regardless of resolution. */
    info->fix.line_length = 16384;
    gp->fb_size = info->fix.line_length * gp->height;

    gp->fb_base = of_ioremap(&op->resource[6], 0,
                 gp->fb_size, "gfb fb");
    if (!gp->fb_base) {
        err = -ENOMEM;
        goto err_release_fb;
    }

    err = gfb_set_fbinfo(gp);
    if (err)
        goto err_unmap_fb;

    printk("gfb: Found device at %s\n", dp->full_name);

    err = register_framebuffer(info);
    if (err < 0) {
        printk(KERN_ERR "gfb: Could not register framebuffer %s\n",
               dp->full_name);
        goto err_unmap_fb;
    }

    dev_set_drvdata(&op->dev, info);

    return 0;

err_unmap_fb:
    of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);

err_release_fb:
        framebuffer_release(info);

err_out:
    return err;
}

static int __devexit gfb_remove(struct platform_device *op)
{
    struct fb_info *info = dev_get_drvdata(&op->dev);
    struct gfb_info *gp = info->par;

    unregister_framebuffer(info);

    iounmap(gp->fb_base);

    of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);

        framebuffer_release(info);

    dev_set_drvdata(&op->dev, NULL);

    return 0;
}

static const struct of_device_id gfb_match[] = {
    {
        .name = "SUNW,gfb",
    },
    {},
};
MODULE_DEVICE_TABLE(of, ffb_match);

static struct platform_driver gfb_driver = {
    .probe      = gfb_probe,
    .remove     = __devexit_p(gfb_remove),
    .driver = {
        .name       = "gfb",
        .owner      = THIS_MODULE,
        .of_match_table = gfb_match,
    },
};

static int __init gfb_init(void)
{
    if (fb_get_options("gfb", NULL))
        return -ENODEV;

    return platform_driver_register(&gfb_driver);
}

static void __exit gfb_exit(void)
{
    platform_driver_unregister(&gfb_driver);
}

module_init(gfb_init);
module_exit(gfb_exit);

MODULE_DESCRIPTION("framebuffer driver for Sun XVR-1000 graphics");
MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");