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/* sunxvr1000.c: Sun XVR-1000 fb driver for sparc64 systems
*
* License: GPL
*
* Copyright (C) 2010 David S. Miller (davem@davemloft.net)
*/
#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_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 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 %pOF\n",
gp->of_node);
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 const struct fb_ops gfb_ops = {
.owner = THIS_MODULE,
FB_DEFAULT_IOMEM_OPS,
.fb_setcolreg = gfb_setcolreg,
};
static int gfb_set_fbinfo(struct gfb_info *gp)
{
struct fb_info *info = gp->info;
struct fb_var_screeninfo *var = &info->var;
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 */
strscpy(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 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) {
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 %pOF\n", dp);
err = register_framebuffer(info);
if (err < 0) {
printk(KERN_ERR "gfb: Could not register framebuffer %pOF\n",
dp);
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 const struct of_device_id gfb_match[] = {
{
.name = "SUNW,gfb",
},
{},
};
static struct platform_driver gfb_driver = {
.probe = gfb_probe,
.driver = {
.name = "gfb",
.of_match_table = gfb_match,
.suppress_bind_attrs = true,
},
};
static int __init gfb_init(void)
{
if (fb_get_options("gfb", NULL))
return -ENODEV;
return platform_driver_register(&gfb_driver);
}
device_initcall(gfb_init);
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