cg6.c

Linux环境下视频显示卡设备的驱动程序源代码

		}
		if (width) {
			u32 val;

			sbus_writel(y, &fbc->y0);
			sbus_writel(x, &fbc->x0);
			sbus_writel(x + width - 1, &fbc->x1);
			if (width <= 8) {
				val = (u32) data[0] << 24;
				data += 1;
			} else if (width <= 16) {
				val = ((u32) data[0] << 24) |
				      ((u32) data[1] << 16);
				data += 2;
			} else {
				val = ((u32) data[0] << 24) |
				      ((u32) data[1] << 16) |
				      ((u32) data[2] <<  8);
				data += 3;
			}
			sbus_writel(val, &fbc->font);
		}

		y += 1;
		x = image->dx;
	}

	spin_unlock_irqrestore(&par->lock, flags);
}

/**
 *	cg6_setcolreg - Sets a color register.
 *
 *	@regno: boolean, 0 copy local, 1 get_user() function
 *	@red: frame buffer colormap structure
 *	@green: The green value which can be up to 16 bits wide
 *	@blue:  The blue value which can be up to 16 bits wide.
 *	@transp: If supported the alpha value which can be up to 16 bits wide.
 *	@info: frame buffer info structure
 */
static int cg6_setcolreg(unsigned regno,
			 unsigned red, unsigned green, unsigned blue,
			 unsigned transp, struct fb_info *info)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct bt_regs __iomem *bt = par->bt;
	unsigned long flags;

	if (regno >= 256)
		return 1;

	red >>= 8;
	green >>= 8;
	blue >>= 8;

	spin_lock_irqsave(&par->lock, flags);

	sbus_writel((u32)regno << 24, &bt->addr);
	sbus_writel((u32)red << 24, &bt->color_map);
	sbus_writel((u32)green << 24, &bt->color_map);
	sbus_writel((u32)blue << 24, &bt->color_map);

	spin_unlock_irqrestore(&par->lock, flags);

	return 0;
}

/**
 *	cg6_blank - Blanks the display.
 *
 *	@blank_mode: the blank mode we want.
 *	@info: frame buffer structure that represents a single frame buffer
 */
static int cg6_blank(int blank, struct fb_info *info)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct cg6_thc __iomem *thc = par->thc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&par->lock, flags);
	val = sbus_readl(&thc->thc_misc);

	switch (blank) {
	case FB_BLANK_UNBLANK: /* Unblanking */
		val |= CG6_THC_MISC_VIDEO;
		par->flags &= ~CG6_FLAG_BLANKED;
		break;

	case FB_BLANK_NORMAL: /* Normal blanking */
	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
	case FB_BLANK_POWERDOWN: /* Poweroff */
		val &= ~CG6_THC_MISC_VIDEO;
		par->flags |= CG6_FLAG_BLANKED;
		break;
	}

	sbus_writel(val, &thc->thc_misc);
	spin_unlock_irqrestore(&par->lock, flags);

	return 0;
}

static struct sbus_mmap_map cg6_mmap_map[] = {
	{
		.voff	= CG6_FBC,
		.poff	= CG6_FBC_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_TEC,
		.poff	= CG6_TEC_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_BTREGS,
		.poff	= CG6_BROOKTREE_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_FHC,
		.poff	= CG6_FHC_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_THC,
		.poff	= CG6_THC_OFFSET,
		.size	= PAGE_SIZE
	},
	{
		.voff	= CG6_ROM,
		.poff	= CG6_ROM_OFFSET,
		.size	= 0x10000
	},
	{
		.voff	= CG6_RAM,
		.poff	= CG6_RAM_OFFSET,
		.size	= SBUS_MMAP_FBSIZE(1)
	},
	{
		.voff	= CG6_DHC,
		.poff	= CG6_DHC_OFFSET,
		.size	= 0x40000
	},
	{ .size	= 0 }
};

static int cg6_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
	struct cg6_par *par = (struct cg6_par *)info->par;

	return sbusfb_mmap_helper(cg6_mmap_map,
				  par->physbase, par->fbsize,
				  par->which_io, vma);
}

static int cg6_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
	struct cg6_par *par = (struct cg6_par *)info->par;

	return sbusfb_ioctl_helper(cmd, arg, info,
				   FBTYPE_SUNFAST_COLOR, 8, par->fbsize);
}

/*
 *  Initialisation
 */

static void __devinit cg6_init_fix(struct fb_info *info, int linebytes)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	const char *cg6_cpu_name, *cg6_card_name;
	u32 conf;

	conf = sbus_readl(par->fhc);
	switch (conf & CG6_FHC_CPU_MASK) {
	case CG6_FHC_CPU_SPARC:
		cg6_cpu_name = "sparc";
		break;
	case CG6_FHC_CPU_68020:
		cg6_cpu_name = "68020";
		break;
	default:
		cg6_cpu_name = "i386";
		break;
	};
	if (((conf >> CG6_FHC_REV_SHIFT) & CG6_FHC_REV_MASK) >= 11) {
		if (par->fbsize <= 0x100000)
			cg6_card_name = "TGX";
		else
			cg6_card_name = "TGX+";
	} else {
		if (par->fbsize <= 0x100000)
			cg6_card_name = "GX";
		else
			cg6_card_name = "GX+";
	}

	sprintf(info->fix.id, "%s %s", cg6_card_name, cg6_cpu_name);
	info->fix.id[sizeof(info->fix.id) - 1] = 0;

	info->fix.type = FB_TYPE_PACKED_PIXELS;
	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

	info->fix.line_length = linebytes;

	info->fix.accel = FB_ACCEL_SUN_CGSIX;
}

/* Initialize Brooktree DAC */
static void __devinit cg6_bt_init(struct cg6_par *par)
{
	struct bt_regs __iomem *bt = par->bt;

	sbus_writel(0x04 << 24, &bt->addr);	 /* color planes */
	sbus_writel(0xff << 24, &bt->control);
	sbus_writel(0x05 << 24, &bt->addr);
	sbus_writel(0x00 << 24, &bt->control);
	sbus_writel(0x06 << 24, &bt->addr);	 /* overlay plane */
	sbus_writel(0x73 << 24, &bt->control);
	sbus_writel(0x07 << 24, &bt->addr);
	sbus_writel(0x00 << 24, &bt->control);
}

static void __devinit cg6_chip_init(struct fb_info *info)
{
	struct cg6_par *par = (struct cg6_par *)info->par;
	struct cg6_tec __iomem *tec = par->tec;
	struct cg6_fbc __iomem *fbc = par->fbc;
	struct cg6_thc __iomem *thc = par->thc;
	u32 rev, conf, mode;
	int i;

	/* Hide the cursor. */
	sbus_writel(CG6_THC_CURSOFF, &thc->thc_cursxy);

	/* Turn off stuff in the Transform Engine. */
	sbus_writel(0, &tec->tec_matrix);
	sbus_writel(0, &tec->tec_clip);
	sbus_writel(0, &tec->tec_vdc);

	/* Take care of bugs in old revisions. */
	rev = (sbus_readl(par->fhc) >> CG6_FHC_REV_SHIFT) & CG6_FHC_REV_MASK;
	if (rev < 5) {
		conf = (sbus_readl(par->fhc) & CG6_FHC_RES_MASK) |
			CG6_FHC_CPU_68020 | CG6_FHC_TEST |
			(11 << CG6_FHC_TEST_X_SHIFT) |
			(11 << CG6_FHC_TEST_Y_SHIFT);
		if (rev < 2)
			conf |= CG6_FHC_DST_DISABLE;
		sbus_writel(conf, par->fhc);
	}

	/* Set things in the FBC. Bad things appear to happen if we do
	 * back to back store/loads on the mode register, so copy it
	 * out instead. */
	mode = sbus_readl(&fbc->mode);
	do {
		i = sbus_readl(&fbc->s);
	} while (i & 0x10000000);
	mode &= ~(CG6_FBC_BLIT_MASK | CG6_FBC_MODE_MASK |
		  CG6_FBC_DRAW_MASK | CG6_FBC_BWRITE0_MASK |
		  CG6_FBC_BWRITE1_MASK | CG6_FBC_BREAD_MASK |
		  CG6_FBC_BDISP_MASK);
	mode |= (CG6_FBC_BLIT_SRC | CG6_FBC_MODE_COLOR8 |
		 CG6_FBC_DRAW_RENDER | CG6_FBC_BWRITE0_ENABLE |
		 CG6_FBC_BWRITE1_DISABLE | CG6_FBC_BREAD_0 |
		 CG6_FBC_BDISP_0);
	sbus_writel(mode, &fbc->mode);

	sbus_writel(0, &fbc->clip);
	sbus_writel(0, &fbc->offx);
	sbus_writel(0, &fbc->offy);
	sbus_writel(0, &fbc->clipminx);
	sbus_writel(0, &fbc->clipminy);
	sbus_writel(info->var.xres - 1, &fbc->clipmaxx);
	sbus_writel(info->var.yres - 1, &fbc->clipmaxy);
}

static void cg6_unmap_regs(struct of_device *op, struct fb_info *info,
			   struct cg6_par *par)
{
	if (par->fbc)
		of_iounmap(&op->resource[0], par->fbc, 4096);
	if (par->tec)
		of_iounmap(&op->resource[0], par->tec, sizeof(struct cg6_tec));
	if (par->thc)
		of_iounmap(&op->resource[0], par->thc, sizeof(struct cg6_thc));
	if (par->bt)
		of_iounmap(&op->resource[0], par->bt, sizeof(struct bt_regs));
	if (par->fhc)
		of_iounmap(&op->resource[0], par->fhc, sizeof(u32));

	if (info->screen_base)
		of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
}

static int __devinit cg6_probe(struct of_device *op,
				const struct of_device_id *match)
{
	struct device_node *dp = op->node;
	struct fb_info *info;
	struct cg6_par *par;
	int linebytes, err;
	int dblbuf;

	info = framebuffer_alloc(sizeof(struct cg6_par), &op->dev);

	err = -ENOMEM;
	if (!info)
		goto out_err;
	par = info->par;

	spin_lock_init(&par->lock);

	par->physbase = op->resource[0].start;
	par->which_io = op->resource[0].flags & IORESOURCE_BITS;

	sbusfb_fill_var(&info->var, dp, 8);
	info->var.red.length = 8;
	info->var.green.length = 8;
	info->var.blue.length = 8;

	linebytes = of_getintprop_default(dp, "linebytes",
					  info->var.xres);
	par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);

	dblbuf = of_getintprop_default(dp, "dblbuf", 0);
	if (dblbuf)
		par->fbsize *= 4;

	par->fbc = of_ioremap(&op->resource[0], CG6_FBC_OFFSET,
				4096, "cgsix fbc");
	par->tec = of_ioremap(&op->resource[0], CG6_TEC_OFFSET,
				sizeof(struct cg6_tec), "cgsix tec");
	par->thc = of_ioremap(&op->resource[0], CG6_THC_OFFSET,
				sizeof(struct cg6_thc), "cgsix thc");
	par->bt = of_ioremap(&op->resource[0], CG6_BROOKTREE_OFFSET,
				sizeof(struct bt_regs), "cgsix dac");
	par->fhc = of_ioremap(&op->resource[0], CG6_FHC_OFFSET,
				sizeof(u32), "cgsix fhc");

	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_IMAGEBLIT |
			FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT |
			FBINFO_READS_FAST;
	info->fbops = &cg6_ops;

	info->screen_base = of_ioremap(&op->resource[0], CG6_RAM_OFFSET,
					par->fbsize, "cgsix ram");
	if (!par->fbc || !par->tec || !par->thc ||
	    !par->bt || !par->fhc || !info->screen_base)
		goto out_unmap_regs;

	info->var.accel_flags = FB_ACCELF_TEXT;

	cg6_bt_init(par);
	cg6_chip_init(info);
	cg6_blank(FB_BLANK_UNBLANK, info);

	if (fb_alloc_cmap(&info->cmap, 256, 0))
		goto out_unmap_regs;

	fb_set_cmap(&info->cmap, info);
	cg6_init_fix(info, linebytes);

	err = register_framebuffer(info);
	if (err < 0)
		goto out_dealloc_cmap;

	dev_set_drvdata(&op->dev, info);

	printk(KERN_INFO "%s: CGsix [%s] at %lx:%lx\n",
	       dp->full_name, info->fix.id,
	       par->which_io, par->physbase);

	return 0;

out_dealloc_cmap:
	fb_dealloc_cmap(&info->cmap);

out_unmap_regs:
	cg6_unmap_regs(op, info, par);

out_err:
	return err;
}

static int __devexit cg6_remove(struct of_device *op)
{
	struct fb_info *info = dev_get_drvdata(&op->dev);
	struct cg6_par *par = info->par;

	unregister_framebuffer(info);
	fb_dealloc_cmap(&info->cmap);

	cg6_unmap_regs(op, info, par);

	framebuffer_release(info);

	dev_set_drvdata(&op->dev, NULL);

	return 0;
}

static const struct of_device_id cg6_match[] = {
	{
		.name = "cgsix",
	},
	{
		.name = "cgthree+",
	},
	{},
};
MODULE_DEVICE_TABLE(of, cg6_match);

static struct of_platform_driver cg6_driver = {
	.name		= "cg6",
	.match_table	= cg6_match,
	.probe		= cg6_probe,
	.remove		= __devexit_p(cg6_remove),
};

static int __init cg6_init(void)
{
	if (fb_get_options("cg6fb", NULL))
		return -ENODEV;

	return of_register_driver(&cg6_driver, &of_bus_type);
}

static void __exit cg6_exit(void)
{
	of_unregister_driver(&cg6_driver);
}

module_init(cg6_init);
module_exit(cg6_exit);

MODULE_DESCRIPTION("framebuffer driver for CGsix chipsets");
MODULE_AUTHOR("David S. Miller <[e-mail]>");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");