/* s3d.c: Sun 3DLABS XVR-2500 et al. driver for sparc64 systems
 *
 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
 */

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

#include <asm/io.h>

struct s3d_info {
	struct fb_info		*info;
	struct pci_dev		*pdev;

	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 s3d_get_props(struct s3d_info *sp)
{
	sp->width = of_getintprop_default(sp->of_node, "width", 0);
	sp->height = of_getintprop_default(sp->of_node, "height", 0);
	sp->depth = of_getintprop_default(sp->of_node, "depth", 8);

	if (!sp->width || !sp->height) {
		printk(KERN_ERR "s3d: Critical properties missing for %s\n",
		       pci_name(sp->pdev));
		return -EINVAL;
	}

	return 0;
}

static int s3d_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 << 24) | (green << 16) | (red << 8);
		((u32 *)info->pseudo_palette)[regno] = value;
	}

	return 0;
}

static struct fb_ops s3d_ops = {
	.owner			= THIS_MODULE,
	.fb_setcolreg		= s3d_setcolreg,
	.fb_fillrect		= cfb_fillrect,
	.fb_copyarea		= cfb_copyarea,
	.fb_imageblit		= cfb_imageblit,
};

static int s3d_set_fbinfo(struct s3d_info *sp)
{
	struct fb_info *info = sp->info;
	struct fb_var_screeninfo *var = &info->var;

	info->flags = FBINFO_DEFAULT;
	info->fbops = &s3d_ops;
	info->screen_base = sp->fb_base;
	info->screen_size = sp->fb_size;

	info->pseudo_palette = sp->pseudo_palette;

	/* Fill fix common fields */
	strlcpy(info->fix.id, "s3d", sizeof(info->fix.id));
        info->fix.smem_start = sp->fb_base_phys;
        info->fix.smem_len = sp->fb_size;
        info->fix.type = FB_TYPE_PACKED_PIXELS;
	if (sp->depth == 32 || sp->depth == 24)
		info->fix.visual = FB_VISUAL_TRUECOLOR;
	else
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

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

	var->red.offset = 8;
	var->red.length = 8;
	var->green.offset = 16;
	var->green.length = 8;
	var->blue.offset = 24;
	var->blue.length = 8;
	var->transp.offset = 0;
	var->transp.length = 0;

	if (fb_alloc_cmap(&info->cmap, 256, 0)) {
		printk(KERN_ERR "s3d: Cannot allocate color map.\n");
		return -ENOMEM;
	}

        return 0;
}

static int s3d_pci_register(struct pci_dev *pdev,
			    const struct pci_device_id *ent)
{
	struct fb_info *info;
	struct s3d_info *sp;
	int err;

	err = pci_enable_device(pdev);
	if (err < 0) {
		printk(KERN_ERR "s3d: Cannot enable PCI device %s\n",
		       pci_name(pdev));
		goto err_out;
	}

	info = framebuffer_alloc(sizeof(struct s3d_info), &pdev->dev);
	if (!info) {
		printk(KERN_ERR "s3d: Cannot allocate fb_info\n");
		err = -ENOMEM;
		goto err_disable;
	}

	sp = info->par;
	sp->info = info;
	sp->pdev = pdev;
	sp->of_node = pci_device_to_OF_node(pdev);
	if (!sp->of_node) {
		printk(KERN_ERR "s3d: Cannot find OF node of %s\n",
		       pci_name(pdev));
		err = -ENODEV;
		goto err_release_fb;
	}

	sp->fb_base_phys = pci_resource_start (pdev, 1);

	err = pci_request_region(pdev, 1, "s3d framebuffer");
	if (err < 0) {
		printk("s3d: Cannot request region 1 for %s\n",
		       pci_name(pdev));
		goto err_release_fb;
	}

	err = s3d_get_props(sp);
	if (err)
		goto err_release_pci;

	/* XXX 'linebytes' is often wrong, it is equal to the width
	 * XXX with depth of 32 on my XVR-2500 which is clearly not
	 * XXX right.  So we don't try to use it.
	 */
	switch (sp->depth) {
	case 8:
		info->fix.line_length = sp->width;
		break;
	case 16:
		info->fix.line_length = sp->width * 2;
		break;
	case 24:
		info->fix.line_length = sp->width * 3;
		break;
	case 32:
		info->fix.line_length = sp->width * 4;
		break;
	}
	sp->fb_size = info->fix.line_length * sp->height;

	sp->fb_base = ioremap(sp->fb_base_phys, sp->fb_size);
	if (!sp->fb_base) {
		err = -ENOMEM;
		goto err_release_pci;
	}

	err = s3d_set_fbinfo(sp);
	if (err)
		goto err_unmap_fb;

	pci_set_drvdata(pdev, info);

	printk("s3d: Found device at %s\n", pci_name(pdev));

	err = register_framebuffer(info);
	if (err < 0) {
		printk(KERN_ERR "s3d: Could not register framebuffer %s\n",
		       pci_name(pdev));
		goto err_unmap_fb;
	}

	return 0;

err_unmap_fb:
	iounmap(sp->fb_base);

err_release_pci:
	pci_release_region(pdev, 1);

err_release_fb:
        framebuffer_release(info);

err_disable:
	pci_disable_device(pdev);

err_out:
	return err;
}

static void s3d_pci_unregister(struct pci_dev *pdev)
{
	struct fb_info *info = pci_get_drvdata(pdev);
	struct s3d_info *sp = info->par;

	unregister_framebuffer(info);

	iounmap(sp->fb_base);

	pci_release_region(pdev, 1);

        framebuffer_release(info);

	pci_disable_device(pdev);
}

static struct pci_device_id s3d_pci_table[] = {
	{	PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x002c),	},
	{	PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x002d),	},
	{	PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x002e),	},
	{	PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x002f),	},
	{	PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x0030),	},
	{	PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x0031),	},
	{	PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x0032),	},
	{	PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x0033),	},
	{ 0, }
};

static struct pci_driver s3d_driver = {
	.name		= "s3d",
	.id_table	= s3d_pci_table,
	.probe		= s3d_pci_register,
	.remove		= s3d_pci_unregister,
};

static int __init s3d_init(void)
{
	if (fb_get_options("s3d", NULL))
		return -ENODEV;

	return pci_register_driver(&s3d_driver);
}

static void __exit s3d_exit(void)
{
	pci_unregister_driver(&s3d_driver);
}

module_init(s3d_init);
module_exit(s3d_exit);

MODULE_DESCRIPTION("framebuffer driver for Sun XVR-2500 graphics");
MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");