s3c2410fb.c

S3C2410 LCD驱动 | |-- s3c2410fb.c | `-- s3c2410fb.h

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 (mach_info == NULL)
		return -EINVAL;

	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 s3c2410fb_info *fbi)
{
	dprintk("map_video_memory(fbi=%p)\n", fbi);

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

	fbi->map_size = fbi->fb->fix.smem_len;

	if (fbi->map_cpu) {
		/* prevent initial garbage on screen */
		dprintk("map_video_memory: clear %p:%08x\n",
			fbi->map_cpu, fbi->map_size);
		memset(fbi->map_cpu, 0xf0, fbi->map_size);

		fbi->screen_dma		= fbi->map_dma;
		fbi->fb->screen_base	= fbi->map_cpu;
		fbi->fb->fix.smem_start  = fbi->screen_dma;

		dprintk("map_video_memory: dma=%08x cpu=%p size=%08x\n",
			fbi->map_dma, fbi->map_cpu, fbi->fb->fix.smem_len);
	}

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

static inline void s3c2410fb_unmap_video_memory(struct s3c2410fb_info *fbi)
{
	dma_free_writecombine(fbi->dev,fbi->map_size,fbi->map_cpu, fbi->map_dma);
}

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 s3c2410fb_info *fbi)
{
	unsigned long flags;

	/* 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);

	writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
	writel(fbi->regs.lcdcon2, S3C2410_LCDCON2);
	writel(fbi->regs.lcdcon3, S3C2410_LCDCON3);
	writel(fbi->regs.lcdcon4, S3C2410_LCDCON4);
	writel(fbi->regs.lcdcon5, S3C2410_LCDCON5);

 	s3c2410fb_set_lcdaddr(fbi);

	dprintk("LPCSEL    = 0x%08lx\n", mach_info->lpcsel);
	writel(mach_info->lpcsel, S3C2410_LPCSEL);

	dprintk("replacing TPAL %08x\n", readl(S3C2410_TPAL));

	/* ensure temporary palette disabled */
	writel(0x00, S3C2410_TPAL);

	/* Enable video by setting the ENVID bit to 1 */
	fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID;
	writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
	return 0;
}

static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
{
	unsigned int i;
	unsigned long ent;

	fbi->palette_ready = 0;

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

		writel(ent, 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(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 pt_regs *r)
{
	struct s3c2410fb_info *fbi = dev_id;
	unsigned long lcdirq = readl(S3C2410_LCDINTPND);

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

		writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDINTPND);
		writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDSRCPND);
	}

	return IRQ_HANDLED;
}

static char driver_name[]="s3c2410fb";

static int __init s3c2410fb_probe(struct platform_device *pdev)
{
	struct s3c2410fb_info *info;
	struct fb_info	   *fbinfo;
	struct s3c2410fb_hw *mregs;
	int ret;
	int irq;
	int i;

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

	mregs = &mach_info->regs;

	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;
	}


	info = fbinfo->par;
	info->fb = fbinfo;
	platform_set_drvdata(pdev, fbinfo);

	dprintk("devinit\n");

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

	memcpy(&info->regs, &mach_info->regs, sizeof(info->regs));

	info->mach_info		    = pdev->dev.platform_data;

	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.height	    = mach_info->height;
	fbinfo->var.width	    = mach_info->width;
	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;

	fbinfo->var.xres	    = mach_info->xres.defval;
	fbinfo->var.xres_virtual    = mach_info->xres.defval;
	fbinfo->var.yres	    = mach_info->yres.defval;
	fbinfo->var.yres_virtual    = mach_info->yres.defval;
	fbinfo->var.bits_per_pixel  = mach_info->bpp.defval;

	fbinfo->var.upper_margin    = S3C2410_LCDCON2_GET_VBPD(mregs->lcdcon2) + 1;
	fbinfo->var.lower_margin    = S3C2410_LCDCON2_GET_VFPD(mregs->lcdcon2) + 1;
	fbinfo->var.vsync_len	    = S3C2410_LCDCON2_GET_VSPW(mregs->lcdcon2) + 1;

	fbinfo->var.left_margin	    = S3C2410_LCDCON3_GET_HFPD(mregs->lcdcon3) + 1;
	fbinfo->var.right_margin    = S3C2410_LCDCON3_GET_HBPD(mregs->lcdcon3) + 1;
	fbinfo->var.hsync_len	    = S3C2410_LCDCON4_GET_HSPW(mregs->lcdcon4) + 1;

	fbinfo->var.red.offset      = 11;
	fbinfo->var.green.offset    = 5;
	fbinfo->var.blue.offset     = 0;
	fbinfo->var.transp.offset   = 0;
	fbinfo->var.red.length      = 5;
	fbinfo->var.green.length    = 6;
	fbinfo->var.blue.length     = 5;
	fbinfo->var.transp.length   = 0;
	fbinfo->fix.smem_len        =	mach_info->xres.max *
					mach_info->yres.max *
					mach_info->bpp.max / 8;

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

	if (!request_mem_region((unsigned long)S3C24XX_VA_LCD, SZ_1M, "s3c2410-lcd")) {
		ret = -EBUSY;
		goto dealloc_fb;
	}


	dprintk("got LCD region\n");

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

	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);

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

	ret = s3c2410fb_init_registers(info);

	ret = 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 */
	device_create_file(&pdev->dev, &dev_attr_debug);

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

	return 0;

free_video_memory:
	s3c2410fb_unmap_video_memory(info);
release_clock:
	clk_disable(info->clk);
	clk_put(info->clk);
release_irq:
	free_irq(irq,info);
release_mem:
 	release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
dealloc_fb:
	framebuffer_release(fbinfo);
	return ret;
}

/* s3c2410fb_stop_lcd
 *
 * shutdown the lcd controller
*/

static void s3c2410fb_stop_lcd(void)
{
	unsigned long flags;
	unsigned long tmp;

	local_irq_save(flags);

	tmp = readl(S3C2410_LCDCON1);
	writel(tmp & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);

	local_irq_restore(flags);
}

/*
 *  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;

	s3c2410fb_stop_lcd();
	msleep(1);

	s3c2410fb_unmap_video_memory(info);

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

	irq = platform_get_irq(pdev, 0);
	free_irq(irq,info);
	release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
	unregister_framebuffer(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_stop_lcd();

	/* 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(info);

	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,
	},
};

int __devinit s3c2410fb_init(void)
{
	return platform_driver_register(&s3c2410fb_driver);
}

static void __exit s3c2410fb_cleanup(void)
{
	platform_driver_unregister(&s3c2410fb_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");