sh_mobile_lcdcfb.c

Linux环境下视频显示卡设备的驱动程序源代码

}

static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
{
	struct sh_mobile_lcdc_chan *ch;
	struct sh_mobile_lcdc_board_cfg	*board_cfg;
	int k;

	/* tell the board code to disable the panel */
	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
		ch = &priv->ch[k];
		board_cfg = &ch->cfg.board_cfg;
		if (board_cfg->display_off)
			board_cfg->display_off(board_cfg->board_data);

		/* cleanup deferred io if enabled */
		if (ch->info.fbdefio) {
			fb_deferred_io_cleanup(&ch->info);
			ch->info.fbdefio = NULL;
		}
	}

	/* stop the lcdc */
	sh_mobile_lcdc_start_stop(priv, 0);

	/* stop clocks */
	for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
		if (priv->ch[k].enabled)
			sh_mobile_lcdc_clk_off(priv);
}

static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
{
	int ifm, miftyp;

	switch (ch->cfg.interface_type) {
	case RGB8: ifm = 0; miftyp = 0; break;
	case RGB9: ifm = 0; miftyp = 4; break;
	case RGB12A: ifm = 0; miftyp = 5; break;
	case RGB12B: ifm = 0; miftyp = 6; break;
	case RGB16: ifm = 0; miftyp = 7; break;
	case RGB18: ifm = 0; miftyp = 10; break;
	case RGB24: ifm = 0; miftyp = 11; break;
	case SYS8A: ifm = 1; miftyp = 0; break;
	case SYS8B: ifm = 1; miftyp = 1; break;
	case SYS8C: ifm = 1; miftyp = 2; break;
	case SYS8D: ifm = 1; miftyp = 3; break;
	case SYS9: ifm = 1; miftyp = 4; break;
	case SYS12: ifm = 1; miftyp = 5; break;
	case SYS16A: ifm = 1; miftyp = 7; break;
	case SYS16B: ifm = 1; miftyp = 8; break;
	case SYS16C: ifm = 1; miftyp = 9; break;
	case SYS18: ifm = 1; miftyp = 10; break;
	case SYS24: ifm = 1; miftyp = 11; break;
	default: goto bad;
	}

	/* SUBLCD only supports SYS interface */
	if (lcdc_chan_is_sublcd(ch)) {
		if (ifm == 0)
			goto bad;
		else
			ifm = 0;
	}

	ch->ldmt1r_value = (ifm << 12) | miftyp;
	return 0;
 bad:
	return -EINVAL;
}

static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
				       int clock_source,
				       struct sh_mobile_lcdc_priv *priv)
{
#ifdef CONFIG_HAVE_CLK
	char clk_name[8];
#endif
	char *str;
	int icksel;

	switch (clock_source) {
	case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
	case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
	case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
	default:
		return -EINVAL;
	}

	priv->lddckr = icksel << 16;

#ifdef CONFIG_HAVE_CLK
	atomic_set(&priv->clk_usecnt, -1);
	snprintf(clk_name, sizeof(clk_name), "lcdc%d", pdev->id);
	priv->clk = clk_get(&pdev->dev, clk_name);
	if (IS_ERR(priv->clk)) {
		dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
		return PTR_ERR(priv->clk);
	}
	
	if (str) {
		priv->dot_clk = clk_get(&pdev->dev, str);
		if (IS_ERR(priv->dot_clk)) {
			dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
			clk_put(priv->clk);
			return PTR_ERR(priv->dot_clk);
		}
	}
#endif

	return 0;
}

static int sh_mobile_lcdc_setcolreg(u_int regno,
				    u_int red, u_int green, u_int blue,
				    u_int transp, struct fb_info *info)
{
	u32 *palette = info->pseudo_palette;

	if (regno >= PALETTE_NR)
		return -EINVAL;

	/* only FB_VISUAL_TRUECOLOR supported */

	red >>= 16 - info->var.red.length;
	green >>= 16 - info->var.green.length;
	blue >>= 16 - info->var.blue.length;
	transp >>= 16 - info->var.transp.length;

	palette[regno] = (red << info->var.red.offset) |
	  (green << info->var.green.offset) |
	  (blue << info->var.blue.offset) |
	  (transp << info->var.transp.offset);

	return 0;
}

static struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
	.id =		"SH Mobile LCDC",
	.type =		FB_TYPE_PACKED_PIXELS,
	.visual =	FB_VISUAL_TRUECOLOR,
	.accel =	FB_ACCEL_NONE,
};

static void sh_mobile_lcdc_fillrect(struct fb_info *info,
				    const struct fb_fillrect *rect)
{
	sys_fillrect(info, rect);
	sh_mobile_lcdc_deferred_io_touch(info);
}

static void sh_mobile_lcdc_copyarea(struct fb_info *info,
				    const struct fb_copyarea *area)
{
	sys_copyarea(info, area);
	sh_mobile_lcdc_deferred_io_touch(info);
}

static void sh_mobile_lcdc_imageblit(struct fb_info *info,
				     const struct fb_image *image)
{
	sys_imageblit(info, image);
	sh_mobile_lcdc_deferred_io_touch(info);
}

static struct fb_ops sh_mobile_lcdc_ops = {
	.fb_setcolreg	= sh_mobile_lcdc_setcolreg,
	.fb_read        = fb_sys_read,
	.fb_write       = fb_sys_write,
	.fb_fillrect	= sh_mobile_lcdc_fillrect,
	.fb_copyarea	= sh_mobile_lcdc_copyarea,
	.fb_imageblit	= sh_mobile_lcdc_imageblit,
};

static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
{
	switch (bpp) {
	case 16: /* PKF[4:0] = 00011 - RGB 565 */
		var->red.offset = 11;
		var->red.length = 5;
		var->green.offset = 5;
		var->green.length = 6;
		var->blue.offset = 0;
		var->blue.length = 5;
		var->transp.offset = 0;
		var->transp.length = 0;
		break;

	case 32: /* PKF[4:0] = 00000 - RGB 888
		  * sh7722 pdf says 00RRGGBB but reality is GGBB00RR
		  * this may be because LDDDSR has word swap enabled..
		  */
		var->red.offset = 0;
		var->red.length = 8;
		var->green.offset = 24;
		var->green.length = 8;
		var->blue.offset = 16;
		var->blue.length = 8;
		var->transp.offset = 0;
		var->transp.length = 0;
		break;
	default:
		return -EINVAL;
	}
	var->bits_per_pixel = bpp;
	var->red.msb_right = 0;
	var->green.msb_right = 0;
	var->blue.msb_right = 0;
	var->transp.msb_right = 0;
	return 0;
}

static int sh_mobile_lcdc_remove(struct platform_device *pdev);

static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
{
	struct fb_info *info;
	struct sh_mobile_lcdc_priv *priv;
	struct sh_mobile_lcdc_info *pdata;
	struct sh_mobile_lcdc_chan_cfg *cfg;
	struct resource *res;
	int error;
	void *buf;
	int i, j;

	if (!pdev->dev.platform_data) {
		dev_err(&pdev->dev, "no platform data defined\n");
		error = -EINVAL;
		goto err0;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	i = platform_get_irq(pdev, 0);
	if (!res || i < 0) {
		dev_err(&pdev->dev, "cannot get platform resources\n");
		error = -ENOENT;
		goto err0;
	}

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		dev_err(&pdev->dev, "cannot allocate device data\n");
		error = -ENOMEM;
		goto err0;
	}

	error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
			    pdev->dev.bus_id, priv);
	if (error) {
		dev_err(&pdev->dev, "unable to request irq\n");
		goto err1;
	}

	priv->irq = i;
	platform_set_drvdata(pdev, priv);
	pdata = pdev->dev.platform_data;

	j = 0;
	for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
		priv->ch[j].lcdc = priv;
		memcpy(&priv->ch[j].cfg, &pdata->ch[i], sizeof(pdata->ch[i]));

		error = sh_mobile_lcdc_check_interface(&priv->ch[i]);
		if (error) {
			dev_err(&pdev->dev, "unsupported interface type\n");
			goto err1;
		}

		switch (pdata->ch[i].chan) {
		case LCDC_CHAN_MAINLCD:
			priv->ch[j].enabled = 1 << 1;
			priv->ch[j].reg_offs = lcdc_offs_mainlcd;
			j++;
			break;
		case LCDC_CHAN_SUBLCD:
			priv->ch[j].enabled = 1 << 2;
			priv->ch[j].reg_offs = lcdc_offs_sublcd;
			j++;
			break;
		}
	}

	if (!j) {
		dev_err(&pdev->dev, "no channels defined\n");
		error = -EINVAL;
		goto err1;
	}

	error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
	if (error) {
		dev_err(&pdev->dev, "unable to setup clocks\n");
		goto err1;
	}

	priv->base = ioremap_nocache(res->start, (res->end - res->start) + 1);

	for (i = 0; i < j; i++) {
		info = &priv->ch[i].info;
		cfg = &priv->ch[i].cfg;

		info->fbops = &sh_mobile_lcdc_ops;
		info->var.xres = info->var.xres_virtual = cfg->lcd_cfg.xres;
		info->var.yres = info->var.yres_virtual = cfg->lcd_cfg.yres;
		info->var.width = cfg->lcd_size_cfg.width;
		info->var.height = cfg->lcd_size_cfg.height;
		info->var.activate = FB_ACTIVATE_NOW;
		error = sh_mobile_lcdc_set_bpp(&info->var, cfg->bpp);
		if (error)
			break;

		info->fix = sh_mobile_lcdc_fix;
		info->fix.line_length = cfg->lcd_cfg.xres * (cfg->bpp / 8);
		info->fix.smem_len = info->fix.line_length * cfg->lcd_cfg.yres;

		buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
					 &priv->ch[i].dma_handle, GFP_KERNEL);
		if (!buf) {
			dev_err(&pdev->dev, "unable to allocate buffer\n");
			error = -ENOMEM;
			break;
		}

		info->pseudo_palette = &priv->ch[i].pseudo_palette;
		info->flags = FBINFO_FLAG_DEFAULT;

		error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
		if (error < 0) {
			dev_err(&pdev->dev, "unable to allocate cmap\n");
			dma_free_coherent(&pdev->dev, info->fix.smem_len,
					  buf, priv->ch[i].dma_handle);
			break;
		}

		memset(buf, 0, info->fix.smem_len);
		info->fix.smem_start = priv->ch[i].dma_handle;
		info->screen_base = buf;
		info->device = &pdev->dev;
		info->par = &priv->ch[i];
	}

	if (error)
		goto err1;

	error = sh_mobile_lcdc_start(priv);
	if (error) {
		dev_err(&pdev->dev, "unable to start hardware\n");
		goto err1;
	}

	for (i = 0; i < j; i++) {
		error = register_framebuffer(&priv->ch[i].info);
		if (error < 0)
			goto err1;
	}

	for (i = 0; i < j; i++) {
		info = &priv->ch[i].info;
		dev_info(info->dev,
			 "registered %s/%s as %dx%d %dbpp.\n",
			 pdev->name,
			 (priv->ch[i].cfg.chan == LCDC_CHAN_MAINLCD) ?
			 "mainlcd" : "sublcd",
			 (int) priv->ch[i].cfg.lcd_cfg.xres,
			 (int) priv->ch[i].cfg.lcd_cfg.yres,
			 priv->ch[i].cfg.bpp);

		/* deferred io mode: disable clock to save power */
		if (info->fbdefio)
			sh_mobile_lcdc_clk_off(priv);
	}

	return 0;
 err1:
	sh_mobile_lcdc_remove(pdev);
 err0:
	return error;
}

static int sh_mobile_lcdc_remove(struct platform_device *pdev)
{
	struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
	struct fb_info *info;
	int i;

	for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
		if (priv->ch[i].info.dev)
			unregister_framebuffer(&priv->ch[i].info);

	sh_mobile_lcdc_stop(priv);

	for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
		info = &priv->ch[i].info;

		if (!info->device)
			continue;

		dma_free_coherent(&pdev->dev, info->fix.smem_len,
				  info->screen_base, priv->ch[i].dma_handle);
		fb_dealloc_cmap(&info->cmap);
	}

#ifdef CONFIG_HAVE_CLK
	if (priv->dot_clk)
		clk_put(priv->dot_clk);
	clk_put(priv->clk);
#endif

	if (priv->base)
		iounmap(priv->base);

	if (priv->irq)
		free_irq(priv->irq, priv);
	kfree(priv);
	return 0;
}

static struct platform_driver sh_mobile_lcdc_driver = {
	.driver		= {
		.name		= "sh_mobile_lcdc_fb",
		.owner		= THIS_MODULE,
	},
	.probe		= sh_mobile_lcdc_probe,
	.remove		= sh_mobile_lcdc_remove,
};

static int __init sh_mobile_lcdc_init(void)
{
	return platform_driver_register(&sh_mobile_lcdc_driver);
}

static void __exit sh_mobile_lcdc_exit(void)
{
	platform_driver_unregister(&sh_mobile_lcdc_driver);
}

module_init(sh_mobile_lcdc_init);
module_exit(sh_mobile_lcdc_exit);

MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
MODULE_AUTHOR("Magnus Damm <[e-mail]>");
MODULE_LICENSE("GPL v2");