s3c2410fb.c

Linux环境下视频显示卡设备的驱动程序源代码

	local_irq_restore(flags);
}


/*
 *      s3c2410fb_blank
 *	@blank_mode: the blank mode we want.
 *	@info: frame buffer structure that represents a single frame buffer
 *
 *	Blank the screen if blank_mode != 0, else unblank. Return 0 if
 *	blanking succeeded, != 0 if un-/blanking failed due to e.g. a
 *	video mode which doesn't support it. Implements VESA suspend
 *	and powerdown modes on hardware that supports disabling hsync/vsync:
 *
 *	Returns negative errno on error, or zero on success.
 *
 */
static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
{
	struct s3c2410fb_info *fbi = info->par;
	void __iomem *tpal_reg = fbi->io;

	dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);

	tpal_reg += is_s3c2412(fbi) ? S3C2412_TPAL : S3C2410_TPAL;

	if (blank_mode == FB_BLANK_POWERDOWN) {
		s3c2410fb_lcd_enable(fbi, 0);
	} else {
		s3c2410fb_lcd_enable(fbi, 1);
	}

	if (blank_mode == FB_BLANK_UNBLANK)
		writel(0x0, tpal_reg);
	else {
		dprintk("setting TPAL to output 0x000000\n");
		writel(S3C2410_TPAL_EN, tpal_reg);
	}

	return 0;
}

static int s3c2410fb_debug_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
}

static int s3c2410fb_debug_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t len)
{
	if (len < 1)
		return -EINVAL;

	if (strnicmp(buf, "on", 2) == 0 ||
	    strnicmp(buf, "1", 1) == 0) {
		debug = 1;
		printk(KERN_DEBUG "s3c2410fb: Debug On");
	} else if (strnicmp(buf, "off", 3) == 0 ||
		   strnicmp(buf, "0", 1) == 0) {
		debug = 0;
		printk(KERN_DEBUG "s3c2410fb: Debug Off");
	} else {
		return -EINVAL;
	}

	return len;
}

static DEVICE_ATTR(debug, 0666, s3c2410fb_debug_show, s3c2410fb_debug_store);

static struct fb_ops s3c2410fb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= s3c2410fb_check_var,
	.fb_set_par	= s3c2410fb_set_par,
	.fb_blank	= s3c2410fb_blank,
	.fb_setcolreg	= s3c2410fb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

/*
 * s3c2410fb_map_video_memory():
 *	Allocates the DRAM memory for the frame buffer.  This buffer is
 *	remapped into a non-cached, non-buffered, memory region to
 *	allow palette and 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 s3c2410fb_map_video_memory(struct fb_info *info)
{
	struct s3c2410fb_info *fbi = info->par;
	dma_addr_t map_dma;
	unsigned map_size = PAGE_ALIGN(info->fix.smem_len);

	dprintk("map_video_memory(fbi=%p) map_size %u\n", fbi, map_size);

	info->screen_base = dma_alloc_writecombine(fbi->dev, map_size,
						   &map_dma, GFP_KERNEL);

	if (info->screen_base) {
		/* prevent initial garbage on screen */
		dprintk("map_video_memory: clear %p:%08x\n",
			info->screen_base, map_size);
		memset(info->screen_base, 0x00, map_size);

		info->fix.smem_start = map_dma;

		dprintk("map_video_memory: dma=%08lx cpu=%p size=%08x\n",
			info->fix.smem_start, info->screen_base, map_size);
	}

	return info->screen_base ? 0 : -ENOMEM;
}

static inline void s3c2410fb_unmap_video_memory(struct fb_info *info)
{
	struct s3c2410fb_info *fbi = info->par;

	dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
			      info->screen_base, info->fix.smem_start);
}

static inline void modify_gpio(void __iomem *reg,
			       unsigned long set, unsigned long mask)
{
	unsigned long tmp;

	tmp = readl(reg) & ~mask;
	writel(tmp | set, reg);
}

/*
 * s3c2410fb_init_registers - Initialise all LCD-related registers
 */
static int s3c2410fb_init_registers(struct fb_info *info)
{
	struct s3c2410fb_info *fbi = info->par;
	struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
	unsigned long flags;
	void __iomem *regs = fbi->io;
	void __iomem *tpal;
	void __iomem *lpcsel;

	if (is_s3c2412(fbi)) {
		tpal = regs + S3C2412_TPAL;
		lpcsel = regs + S3C2412_TCONSEL;
	} else {
		tpal = regs + S3C2410_TPAL;
		lpcsel = regs + S3C2410_LPCSEL;
	}

	/* Initialise LCD with values from haret */

	local_irq_save(flags);

	/* modify the gpio(s) with interrupts set (bjd) */

	modify_gpio(S3C2410_GPCUP,  mach_info->gpcup,  mach_info->gpcup_mask);
	modify_gpio(S3C2410_GPCCON, mach_info->gpccon, mach_info->gpccon_mask);
	modify_gpio(S3C2410_GPDUP,  mach_info->gpdup,  mach_info->gpdup_mask);
	modify_gpio(S3C2410_GPDCON, mach_info->gpdcon, mach_info->gpdcon_mask);

	local_irq_restore(flags);

	dprintk("LPCSEL    = 0x%08lx\n", mach_info->lpcsel);
	writel(mach_info->lpcsel, lpcsel);

	dprintk("replacing TPAL %08x\n", readl(tpal));

	/* ensure temporary palette disabled */
	writel(0x00, tpal);

	return 0;
}

static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
{
	unsigned int i;
	void __iomem *regs = fbi->io;

	fbi->palette_ready = 0;

	for (i = 0; i < 256; i++) {
		unsigned long ent = fbi->palette_buffer[i];
		if (ent == PALETTE_BUFF_CLEAR)
			continue;

		writel(ent, regs + S3C2410_TFTPAL(i));

		/* it seems the only way to know exactly
		 * if the palette wrote ok, is to check
		 * to see if the value verifies ok
		 */

		if (readw(regs + S3C2410_TFTPAL(i)) == ent)
			fbi->palette_buffer[i] = PALETTE_BUFF_CLEAR;
		else
			fbi->palette_ready = 1;   /* retry */
	}
}

static irqreturn_t s3c2410fb_irq(int irq, void *dev_id)
{
	struct s3c2410fb_info *fbi = dev_id;
	void __iomem *irq_base = fbi->irq_base;
	unsigned long lcdirq = readl(irq_base + S3C24XX_LCDINTPND);

	if (lcdirq & S3C2410_LCDINT_FRSYNC) {
		if (fbi->palette_ready)
			s3c2410fb_write_palette(fbi);

		writel(S3C2410_LCDINT_FRSYNC, irq_base + S3C24XX_LCDINTPND);
		writel(S3C2410_LCDINT_FRSYNC, irq_base + S3C24XX_LCDSRCPND);
	}

	return IRQ_HANDLED;
}

static char driver_name[] = "s3c2410fb";

static int __init s3c24xxfb_probe(struct platform_device *pdev,
				  enum s3c_drv_type drv_type)
{
	struct s3c2410fb_info *info;
	struct s3c2410fb_display *display;
	struct fb_info *fbinfo;
	struct s3c2410fb_mach_info *mach_info;
	struct resource *res;
	int ret;
	int irq;
	int i;
	int size;
	u32 lcdcon1;

	mach_info = pdev->dev.platform_data;
	if (mach_info == NULL) {
		dev_err(&pdev->dev,
			"no platform data for lcd, cannot attach\n");
		return -EINVAL;
	}

	if (mach_info->default_display >= mach_info->num_displays) {
		dev_err(&pdev->dev, "default is %d but only %d displays\n",
			mach_info->default_display, mach_info->num_displays);
		return -EINVAL;
	}

	display = mach_info->displays + mach_info->default_display;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "no irq for device\n");
		return -ENOENT;
	}

	fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), &pdev->dev);
	if (!fbinfo)
		return -ENOMEM;

	platform_set_drvdata(pdev, fbinfo);

	info = fbinfo->par;
	info->dev = &pdev->dev;
	info->drv_type = drv_type;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to get memory registers\n");
		ret = -ENXIO;
		goto dealloc_fb;
	}

	size = (res->end - res->start) + 1;
	info->mem = request_mem_region(res->start, size, pdev->name);
	if (info->mem == NULL) {
		dev_err(&pdev->dev, "failed to get memory region\n");
		ret = -ENOENT;
		goto dealloc_fb;
	}

	info->io = ioremap(res->start, size);
	if (info->io == NULL) {
		dev_err(&pdev->dev, "ioremap() of registers failed\n");
		ret = -ENXIO;
		goto release_mem;
	}

	info->irq_base = info->io + ((drv_type == DRV_S3C2412) ? S3C2412_LCDINTBASE : S3C2410_LCDINTBASE);

	dprintk("devinit\n");

	strcpy(fbinfo->fix.id, driver_name);

	/* Stop the video */
	lcdcon1 = readl(info->io + S3C2410_LCDCON1);
	writel(lcdcon1 & ~S3C2410_LCDCON1_ENVID, info->io + S3C2410_LCDCON1);

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

	fbinfo->var.nonstd	    = 0;
	fbinfo->var.activate	    = FB_ACTIVATE_NOW;
	fbinfo->var.accel_flags     = 0;
	fbinfo->var.vmode	    = FB_VMODE_NONINTERLACED;

	fbinfo->fbops		    = &s3c2410fb_ops;
	fbinfo->flags		    = FBINFO_FLAG_DEFAULT;
	fbinfo->pseudo_palette      = &info->pseudo_pal;

	for (i = 0; i < 256; i++)
		info->palette_buffer[i] = PALETTE_BUFF_CLEAR;

	ret = request_irq(irq, s3c2410fb_irq, IRQF_DISABLED, pdev->name, info);
	if (ret) {
		dev_err(&pdev->dev, "cannot get irq %d - err %d\n", irq, ret);
		ret = -EBUSY;
		goto release_regs;
	}

	info->clk = clk_get(NULL, "lcd");
	if (!info->clk || IS_ERR(info->clk)) {
		printk(KERN_ERR "failed to get lcd clock source\n");
		ret = -ENOENT;
		goto release_irq;
	}

	clk_enable(info->clk);
	dprintk("got and enabled clock\n");

	msleep(1);

	/* find maximum required memory size for display */
	for (i = 0; i < mach_info->num_displays; i++) {
		unsigned long smem_len = mach_info->displays[i].xres;

		smem_len *= mach_info->displays[i].yres;
		smem_len *= mach_info->displays[i].bpp;
		smem_len >>= 3;
		if (fbinfo->fix.smem_len < smem_len)
			fbinfo->fix.smem_len = smem_len;
	}

	/* Initialize video memory */
	ret = s3c2410fb_map_video_memory(fbinfo);
	if (ret) {
		printk(KERN_ERR "Failed to allocate video RAM: %d\n", ret);
		ret = -ENOMEM;
		goto release_clock;
	}

	dprintk("got video memory\n");

	fbinfo->var.xres = display->xres;
	fbinfo->var.yres = display->yres;
	fbinfo->var.bits_per_pixel = display->bpp;

	s3c2410fb_init_registers(fbinfo);

	s3c2410fb_check_var(&fbinfo->var, fbinfo);

	ret = register_framebuffer(fbinfo);
	if (ret < 0) {
		printk(KERN_ERR "Failed to register framebuffer device: %d\n",
			ret);
		goto free_video_memory;
	}

	/* create device files */
	ret = device_create_file(&pdev->dev, &dev_attr_debug);
	if (ret) {
		printk(KERN_ERR "failed to add debug attribute\n");
	}

	printk(KERN_INFO "fb%d: %s frame buffer device\n",
		fbinfo->node, fbinfo->fix.id);

	return 0;

free_video_memory:
	s3c2410fb_unmap_video_memory(fbinfo);
release_clock:
	clk_disable(info->clk);
	clk_put(info->clk);
release_irq:
	free_irq(irq, info);
release_regs:
	iounmap(info->io);
release_mem:
	release_resource(info->mem);
	kfree(info->mem);
dealloc_fb:
	platform_set_drvdata(pdev, NULL);
	framebuffer_release(fbinfo);
	return ret;
}

static int __init s3c2410fb_probe(struct platform_device *pdev)
{
	return s3c24xxfb_probe(pdev, DRV_S3C2410);
}

static int __init s3c2412fb_probe(struct platform_device *pdev)
{
	return s3c24xxfb_probe(pdev, DRV_S3C2412);
}


/*
 *  Cleanup
 */
static int s3c2410fb_remove(struct platform_device *pdev)
{
	struct fb_info *fbinfo = platform_get_drvdata(pdev);
	struct s3c2410fb_info *info = fbinfo->par;
	int irq;

	unregister_framebuffer(fbinfo);

	s3c2410fb_lcd_enable(info, 0);
	msleep(1);

	s3c2410fb_unmap_video_memory(fbinfo);

	if (info->clk) {
		clk_disable(info->clk);
		clk_put(info->clk);
		info->clk = NULL;
	}

	irq = platform_get_irq(pdev, 0);
	free_irq(irq, info);

	iounmap(info->io);

	release_resource(info->mem);
	kfree(info->mem);

	platform_set_drvdata(pdev, NULL);
	framebuffer_release(fbinfo);

	return 0;
}

#ifdef CONFIG_PM

/* suspend and resume support for the lcd controller */
static int s3c2410fb_suspend(struct platform_device *dev, pm_message_t state)
{
	struct fb_info	   *fbinfo = platform_get_drvdata(dev);
	struct s3c2410fb_info *info = fbinfo->par;

	s3c2410fb_lcd_enable(info, 0);

	/* sleep before disabling the clock, we need to ensure
	 * the LCD DMA engine is not going to get back on the bus
	 * before the clock goes off again (bjd) */

	msleep(1);
	clk_disable(info->clk);

	return 0;
}

static int s3c2410fb_resume(struct platform_device *dev)
{
	struct fb_info	   *fbinfo = platform_get_drvdata(dev);
	struct s3c2410fb_info *info = fbinfo->par;

	clk_enable(info->clk);
	msleep(1);

	s3c2410fb_init_registers(fbinfo);

	return 0;
}

#else
#define s3c2410fb_suspend NULL
#define s3c2410fb_resume  NULL
#endif

static struct platform_driver s3c2410fb_driver = {
	.probe		= s3c2410fb_probe,
	.remove		= s3c2410fb_remove,
	.suspend	= s3c2410fb_suspend,
	.resume		= s3c2410fb_resume,
	.driver		= {
		.name	= "s3c2410-lcd",
		.owner	= THIS_MODULE,
	},
};

static struct platform_driver s3c2412fb_driver = {
	.probe		= s3c2412fb_probe,
	.remove		= s3c2410fb_remove,
	.suspend	= s3c2410fb_suspend,
	.resume		= s3c2410fb_resume,
	.driver		= {
		.name	= "s3c2412-lcd",
		.owner	= THIS_MODULE,
	},
};

int __init s3c2410fb_init(void)
{
	int ret = platform_driver_register(&s3c2410fb_driver);

	if (ret == 0)
		ret = platform_driver_register(&s3c2412fb_driver);;

	return ret;
}

static void __exit s3c2410fb_cleanup(void)
{
	platform_driver_unregister(&s3c2410fb_driver);
	platform_driver_unregister(&s3c2412fb_driver);
}

module_init(s3c2410fb_init);
module_exit(s3c2410fb_cleanup);

MODULE_AUTHOR("Arnaud Patard <[e-mail]>, "
	      "Ben Dooks <[e-mail]>");
MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2410-lcd");
MODULE_ALIAS("platform:s3c2412-lcd");