imxfb.c

Linux环境下视频显示卡设备的驱动程序源代码

	if (fbi->backlight_power)
		fbi->backlight_power(1);
	if (fbi->lcd_power)
		fbi->lcd_power(1);
}

static void imxfb_disable_controller(struct imxfb_info *fbi)
{
	pr_debug("Disabling LCD controller\n");

	if (fbi->backlight_power)
		fbi->backlight_power(0);
	if (fbi->lcd_power)
		fbi->lcd_power(0);

	writel(0, fbi->regs + LCDC_RMCR);
}

static int imxfb_blank(int blank, struct fb_info *info)
{
	struct imxfb_info *fbi = info->par;

	pr_debug("imxfb_blank: blank=%d\n", blank);

	switch (blank) {
	case FB_BLANK_POWERDOWN:
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_NORMAL:
		imxfb_disable_controller(fbi);
		break;

	case FB_BLANK_UNBLANK:
		imxfb_enable_controller(fbi);
		break;
	}
	return 0;
}

static struct fb_ops imxfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= imxfb_check_var,
	.fb_set_par	= imxfb_set_par,
	.fb_setcolreg	= imxfb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_blank	= imxfb_blank,
};

/*
 * imxfb_activate_var():
 *	Configures LCD Controller based on entries in var parameter.  Settings are
 *	only written to the controller if changes were made.
 */
static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct imxfb_info *fbi = info->par;
	pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
		var->xres, var->hsync_len,
		var->left_margin, var->right_margin);
	pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
		var->yres, var->vsync_len,
		var->upper_margin, var->lower_margin);

#if DEBUG_VAR
	if (var->xres < 16        || var->xres > 1024)
		printk(KERN_ERR "%s: invalid xres %d\n",
			info->fix.id, var->xres);
	if (var->hsync_len < 1    || var->hsync_len > 64)
		printk(KERN_ERR "%s: invalid hsync_len %d\n",
			info->fix.id, var->hsync_len);
	if (var->left_margin > 255)
		printk(KERN_ERR "%s: invalid left_margin %d\n",
			info->fix.id, var->left_margin);
	if (var->right_margin > 255)
		printk(KERN_ERR "%s: invalid right_margin %d\n",
			info->fix.id, var->right_margin);
	if (var->yres < 1 || var->yres > 511)
		printk(KERN_ERR "%s: invalid yres %d\n",
			info->fix.id, var->yres);
	if (var->vsync_len > 100)
		printk(KERN_ERR "%s: invalid vsync_len %d\n",
			info->fix.id, var->vsync_len);
	if (var->upper_margin > 63)
		printk(KERN_ERR "%s: invalid upper_margin %d\n",
			info->fix.id, var->upper_margin);
	if (var->lower_margin > 255)
		printk(KERN_ERR "%s: invalid lower_margin %d\n",
			info->fix.id, var->lower_margin);
#endif

	writel(HCR_H_WIDTH(var->hsync_len) |
		HCR_H_WAIT_1(var->right_margin) |
		HCR_H_WAIT_2(var->left_margin),
		fbi->regs + LCDC_HCR);

	writel(VCR_V_WIDTH(var->vsync_len) |
		VCR_V_WAIT_1(var->lower_margin) |
		VCR_V_WAIT_2(var->upper_margin),
		fbi->regs + LCDC_VCR);

	writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
			fbi->regs + LCDC_SIZE);
	writel(fbi->pcr, fbi->regs + LCDC_PCR);
	writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
	writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
	writel(fbi->dmacr, fbi->regs + LCDC_DMACR);

	return 0;
}

#ifdef CONFIG_PM
/*
 * Power management hooks.  Note that we won't be called from IRQ context,
 * unlike the blank functions above, so we may sleep.
 */
static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
{
	struct imxfb_info *fbi = platform_get_drvdata(dev);

	pr_debug("%s\n", __func__);

	imxfb_disable_controller(fbi);
	return 0;
}

static int imxfb_resume(struct platform_device *dev)
{
	struct imxfb_info *fbi = platform_get_drvdata(dev);

	pr_debug("%s\n", __func__);

	imxfb_enable_controller(fbi);
	return 0;
}
#else
#define imxfb_suspend	NULL
#define imxfb_resume	NULL
#endif

static int __init imxfb_init_fbinfo(struct platform_device *pdev)
{
	struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
	struct fb_info *info = dev_get_drvdata(&pdev->dev);
	struct imxfb_info *fbi = info->par;

	pr_debug("%s\n",__func__);

	info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
	if (!info->pseudo_palette)
		return -ENOMEM;

	memset(fbi, 0, sizeof(struct imxfb_info));

	strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));

	info->fix.type			= FB_TYPE_PACKED_PIXELS;
	info->fix.type_aux		= 0;
	info->fix.xpanstep		= 0;
	info->fix.ypanstep		= 0;
	info->fix.ywrapstep		= 0;
	info->fix.accel			= FB_ACCEL_NONE;

	info->var.nonstd		= 0;
	info->var.activate		= FB_ACTIVATE_NOW;
	info->var.height		= -1;
	info->var.width	= -1;
	info->var.accel_flags		= 0;
	info->var.vmode			= FB_VMODE_NONINTERLACED;

	info->fbops			= &imxfb_ops;
	info->flags			= FBINFO_FLAG_DEFAULT |
					  FBINFO_READS_FAST;

	fbi->max_xres			= pdata->xres;
	info->var.xres			= pdata->xres;
	info->var.xres_virtual		= pdata->xres;
	fbi->max_yres			= pdata->yres;
	info->var.yres			= pdata->yres;
	info->var.yres_virtual		= pdata->yres;
	fbi->max_bpp			= pdata->bpp;
	info->var.bits_per_pixel	= pdata->bpp;
	info->var.nonstd		= pdata->nonstd;
	info->var.pixclock		= pdata->pixclock;
	info->var.hsync_len		= pdata->hsync_len;
	info->var.left_margin		= pdata->left_margin;
	info->var.right_margin		= pdata->right_margin;
	info->var.vsync_len		= pdata->vsync_len;
	info->var.upper_margin		= pdata->upper_margin;
	info->var.lower_margin		= pdata->lower_margin;
	info->var.sync			= pdata->sync;
	info->var.grayscale		= pdata->cmap_greyscale;
	fbi->cmap_inverse		= pdata->cmap_inverse;
	fbi->cmap_static		= pdata->cmap_static;
	fbi->pcr			= pdata->pcr;
	fbi->lscr1			= pdata->lscr1;
	fbi->dmacr			= pdata->dmacr;
	fbi->pwmr			= pdata->pwmr;
	fbi->lcd_power			= pdata->lcd_power;
	fbi->backlight_power		= pdata->backlight_power;
	info->fix.smem_len		= fbi->max_xres * fbi->max_yres *
					  fbi->max_bpp / 8;

	return 0;
}

static int __init imxfb_probe(struct platform_device *pdev)
{
	struct imxfb_info *fbi;
	struct fb_info *info;
	struct imx_fb_platform_data *pdata;
	struct resource *res;
	int ret;

	printk("i.MX Framebuffer driver\n");

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev,"No platform_data available\n");
		return -ENOMEM;
	}

	info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
	if (!info)
		return -ENOMEM;

	fbi = info->par;

	platform_set_drvdata(pdev, info);

	ret = imxfb_init_fbinfo(pdev);
	if (ret < 0)
		goto failed_init;

	res = request_mem_region(res->start, resource_size(res),
				DRIVER_NAME);
	if (!res) {
		ret = -EBUSY;
		goto failed_req;
	}

	fbi->regs = ioremap(res->start, resource_size(res));
	if (fbi->regs == NULL) {
		printk(KERN_ERR"Cannot map frame buffer registers\n");
		goto failed_ioremap;
	}

	if (!pdata->fixed_screen_cpu) {
		fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
		fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
				fbi->map_size, &fbi->map_dma, GFP_KERNEL);

		if (!fbi->map_cpu) {
			dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
			ret = -ENOMEM;
			goto failed_map;
		}

		info->screen_base = fbi->map_cpu;
		fbi->screen_cpu = fbi->map_cpu;
		fbi->screen_dma = fbi->map_dma;
		info->fix.smem_start = fbi->screen_dma;
	} else {
		/* Fixed framebuffer mapping enables location of the screen in eSRAM */
		fbi->map_cpu = pdata->fixed_screen_cpu;
		fbi->map_dma = pdata->fixed_screen_dma;
		info->screen_base = fbi->map_cpu;
		fbi->screen_cpu = fbi->map_cpu;
		fbi->screen_dma = fbi->map_dma;
		info->fix.smem_start = fbi->screen_dma;
	}

	/*
	 * This makes sure that our colour bitfield
	 * descriptors are correctly initialised.
	 */
	imxfb_check_var(&info->var, info);

	ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
	if (ret < 0)
		goto failed_cmap;

	imxfb_set_par(info);
	ret = register_framebuffer(info);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to register framebuffer\n");
		goto failed_register;
	}

	imxfb_enable_controller(fbi);

	return 0;

failed_register:
	fb_dealloc_cmap(&info->cmap);
failed_cmap:
	if (!pdata->fixed_screen_cpu)
		dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
			fbi->map_dma);
failed_map:
	iounmap(fbi->regs);
failed_ioremap:
	release_mem_region(res->start, res->end - res->start);
failed_req:
	kfree(info->pseudo_palette);
failed_init:
	platform_set_drvdata(pdev, NULL);
	framebuffer_release(info);
	return ret;
}

static int __devexit imxfb_remove(struct platform_device *pdev)
{
	struct fb_info *info = platform_get_drvdata(pdev);
	struct imxfb_info *fbi = info->par;
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	imxfb_disable_controller(fbi);

	unregister_framebuffer(info);

	fb_dealloc_cmap(&info->cmap);
	kfree(info->pseudo_palette);
	framebuffer_release(info);

	iounmap(fbi->regs);
	release_mem_region(res->start, res->end - res->start + 1);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

void  imxfb_shutdown(struct platform_device * dev)
{
	struct fb_info *info = platform_get_drvdata(dev);
	struct imxfb_info *fbi = info->par;
	imxfb_disable_controller(fbi);
}

static struct platform_driver imxfb_driver = {
	.suspend	= imxfb_suspend,
	.resume		= imxfb_resume,
	.remove		= __devexit_p(imxfb_remove),
	.shutdown	= imxfb_shutdown,
	.driver		= {
		.name	= DRIVER_NAME,
	},
};

int __init imxfb_init(void)
{
	return platform_driver_probe(&imxfb_driver, imxfb_probe);
}

static void __exit imxfb_cleanup(void)
{
	platform_driver_unregister(&imxfb_driver);
}

module_init(imxfb_init);
module_exit(imxfb_cleanup);

MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_LICENSE("GPL");