imxfb.c

linux 内核源代码

	LCDC_HCR	= HCR_H_WIDTH(var->hsync_len) |
	                  HCR_H_WAIT_1(var->left_margin) |
			  HCR_H_WAIT_2(var->right_margin);

	LCDC_VCR	= VCR_V_WIDTH(var->vsync_len) |
	                  VCR_V_WAIT_1(var->upper_margin) |
			  VCR_V_WAIT_2(var->lower_margin);

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

	return 0;
}

static void imxfb_setup_gpio(struct imxfb_info *fbi)
{
	int width;

	LCDC_RMCR	&= ~(RMCR_LCDC_EN | RMCR_SELF_REF);

	if( fbi->pcr & PCR_TFT )
		width = 16;
	else
		width = 1 << ((fbi->pcr >> 28) & 0x3);

	switch(width) {
	case 16:
		imx_gpio_mode(PD30_PF_LD15);
		imx_gpio_mode(PD29_PF_LD14);
		imx_gpio_mode(PD28_PF_LD13);
		imx_gpio_mode(PD27_PF_LD12);
		imx_gpio_mode(PD26_PF_LD11);
		imx_gpio_mode(PD25_PF_LD10);
		imx_gpio_mode(PD24_PF_LD9);
		imx_gpio_mode(PD23_PF_LD8);
	case 8:
		imx_gpio_mode(PD22_PF_LD7);
		imx_gpio_mode(PD21_PF_LD6);
		imx_gpio_mode(PD20_PF_LD5);
		imx_gpio_mode(PD19_PF_LD4);
	case 4:
		imx_gpio_mode(PD18_PF_LD3);
		imx_gpio_mode(PD17_PF_LD2);
	case 2:
		imx_gpio_mode(PD16_PF_LD1);
	case 1:
		imx_gpio_mode(PD15_PF_LD0);
	}

	/* initialize GPIOs */
	imx_gpio_mode(PD6_PF_LSCLK);
	imx_gpio_mode(PD11_PF_CONTRAST);
	imx_gpio_mode(PD14_PF_FLM_VSYNC);
	imx_gpio_mode(PD13_PF_LP_HSYNC);
	imx_gpio_mode(PD12_PF_ACD_OE);

	/* These are only needed for Sharp HR TFT displays */
	if (fbi->pcr & PCR_SHARP) {
		imx_gpio_mode(PD7_PF_REV);
		imx_gpio_mode(PD8_PF_CLS);
		imx_gpio_mode(PD9_PF_PS);
		imx_gpio_mode(PD10_PF_SPL_SPR);
	}
}

#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",__FUNCTION__);

	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",__FUNCTION__);

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

static int __init imxfb_init_fbinfo(struct device *dev)
{
	struct imxfb_mach_info *inf = dev->platform_data;
	struct fb_info *info = dev_get_drvdata(dev);
	struct imxfb_info *fbi = info->par;

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

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

	memset(fbi, 0, sizeof(struct imxfb_info));
	fbi->dev = dev;

	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->rgb[RGB_16]		= &def_rgb_16;
	fbi->rgb[RGB_8]			= &def_rgb_8;

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

	return 0;
}

/*
 *      Allocates the DRAM memory for the frame buffer.  This buffer is
 *	remapped into a non-cached, non-buffered, memory region to
 *      allow pixel writes to occur without flushing the cache.
 *      Once this area is remapped, all virtual memory access to the
 *      video memory should occur at the new region.
 */
static int __init imxfb_map_video_memory(struct fb_info *info)
{
	struct imxfb_info *fbi = info->par;

	fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
	fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
					&fbi->map_dma,GFP_KERNEL);

	if (fbi->map_cpu) {
		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;
	}

	return fbi->map_cpu ? 0 : -ENOMEM;
}

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

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

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

	inf = pdev->dev.platform_data;
	if(!inf) {
		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->dev);
	if( ret < 0 )
		goto failed_init;

	res = request_mem_region(res->start, res->end - res->start + 1, "IMXFB");
	if (!res) {
		ret = -EBUSY;
		goto failed_regs;
	}

	if (!inf->fixed_screen_cpu) {
		ret = imxfb_map_video_memory(info);
		if (ret) {
			dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
			ret = -ENOMEM;
			goto failed_map;
		}
	} else {
		/* Fixed framebuffer mapping enables location of the screen in eSRAM */
		fbi->map_cpu = inf->fixed_screen_cpu;
		fbi->map_dma = inf->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_setup_gpio(fbi);

	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 (!inf->fixed_screen_cpu)
		dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
		           fbi->map_dma);
failed_map:
	kfree(info->pseudo_palette);
failed_regs:
	release_mem_region(res->start, res->end - res->start);
failed_init:
	platform_set_drvdata(pdev, NULL);
	framebuffer_release(info);
	return ret;
}

static int 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);

	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 = {
	.probe		= imxfb_probe,
	.suspend	= imxfb_suspend,
	.resume		= imxfb_resume,
	.remove		= imxfb_remove,
	.shutdown	= imxfb_shutdown,
	.driver		= {
		.name	= "imx-fb",
	},
};

int __init imxfb_init(void)
{
	return platform_driver_register(&imxfb_driver);
}

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");