drivers/video/vt8500lcdfb.c - kernel/msm-4.9 - Gitiles

 /*
  *  linux/drivers/video/vt8500lcdfb.c
  *
  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
  *
  * Based on skeletonfb.c and pxafb.c
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
 #include <linux/wait.h>

 #include <mach/vt8500fb.h>

 #include "vt8500lcdfb.h"
 #include "wmt_ge_rops.h"

 #define to_vt8500lcd_info(__info) container_of(__info, \
 						struct vt8500lcd_info, fb)

 static int vt8500lcd_set_par(struct fb_info *info)
 {
 	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 	int reg_bpp = 5; /* 16bpp */
 	int i;
 	unsigned long control0;

 	if (!fbi)
 		return -EINVAL;

 	if (info->var.bits_per_pixel <= 8) {
 		/* palettized */
 		info->var.red.offset    = 0;
 		info->var.red.length    = info->var.bits_per_pixel;
 		info->var.red.msb_right = 0;

 		info->var.green.offset  = 0;
 		info->var.green.length  = info->var.bits_per_pixel;
 		info->var.green.msb_right = 0;

 		info->var.blue.offset   = 0;
 		info->var.blue.length   = info->var.bits_per_pixel;
 		info->var.blue.msb_right = 0;

 		info->var.transp.offset = 0;
 		info->var.transp.length = 0;
 		info->var.transp.msb_right = 0;

 		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 		info->fix.line_length = info->var.xres_virtual /
 						(8/info->var.bits_per_pixel);
 	} else {
 		/* non-palettized */
 		info->var.transp.offset = 0;
 		info->var.transp.length = 0;
 		info->var.transp.msb_right = 0;

 		if (info->var.bits_per_pixel == 16) {
 			/* RGB565 */
 			info->var.red.offset = 11;
 			info->var.red.length = 5;
 			info->var.red.msb_right = 0;
 			info->var.green.offset = 5;
 			info->var.green.length = 6;
 			info->var.green.msb_right = 0;
 			info->var.blue.offset = 0;
 			info->var.blue.length = 5;
 			info->var.blue.msb_right = 0;
 		} else {
 			/* Equal depths per channel */
 			info->var.red.offset = info->var.bits_per_pixel
 							* 2 / 3;
 			info->var.red.length = info->var.bits_per_pixel / 3;
 			info->var.red.msb_right = 0;
 			info->var.green.offset = info->var.bits_per_pixel / 3;
 			info->var.green.length = info->var.bits_per_pixel / 3;
 			info->var.green.msb_right = 0;
 			info->var.blue.offset = 0;
 			info->var.blue.length = info->var.bits_per_pixel / 3;
 			info->var.blue.msb_right = 0;
 		}

 		info->fix.visual = FB_VISUAL_TRUECOLOR;
 		info->fix.line_length = info->var.bits_per_pixel > 16 ?
 					info->var.xres_virtual << 2 :
 					info->var.xres_virtual << 1;
 	}

 	for (i = 0; i < 8; i++) {
 		if (bpp_values[i] == info->var.bits_per_pixel) {
 			reg_bpp = i;
 			continue;
 		}
 	}

 	control0 = readl(fbi->regbase) & ~0xf;
 	writel(0, fbi->regbase);
 	while (readl(fbi->regbase + 0x38) & 0x10)
 		/* wait */;
 	writel((((info->var.hsync_len - 1) & 0x3f) << 26)
 		| ((info->var.left_margin & 0xff) << 18)
 		| (((info->var.xres - 1) & 0x3ff) << 8)
 		| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
 	writel((((info->var.vsync_len - 1) & 0x3f) << 26)
 		| ((info->var.upper_margin & 0xff) << 18)
 		| (((info->var.yres - 1) & 0x3ff) << 8)
 		| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
 	writel((((info->var.yres - 1) & 0x400) << 2)
 		| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
 	writel(0x80000000, fbi->regbase + 0x20);
 	writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);

 	return 0;
 }

 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 {
 	chan &= 0xffff;
 	chan >>= 16 - bf->length;
 	return chan << bf->offset;
 }

 static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
 			   unsigned blue, unsigned transp,
 			   struct fb_info *info) {
 	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 	int ret = 1;
 	unsigned int val;
 	if (regno >= 256)
 		return -EINVAL;

 	if (info->var.grayscale)
 		red = green = blue =
 			(19595 * red + 38470 * green + 7471 * blue) >> 16;

 	switch (fbi->fb.fix.visual) {
 	case FB_VISUAL_TRUECOLOR:
 		if (regno < 16) {
 			u32 *pal = fbi->fb.pseudo_palette;

 			val  = chan_to_field(red, &fbi->fb.var.red);
 			val |= chan_to_field(green, &fbi->fb.var.green);
 			val |= chan_to_field(blue, &fbi->fb.var.blue);

 			pal[regno] = val;
 			ret = 0;
 		}
 		break;

 	case FB_VISUAL_STATIC_PSEUDOCOLOR:
 	case FB_VISUAL_PSEUDOCOLOR:
 		writew((red & 0xf800)
 		      | ((green >> 5) & 0x7e0)
 		      | ((blue >> 11) & 0x1f),
 		       fbi->palette_cpu + sizeof(u16) * regno);
 		break;
 	}

 	return ret;
 }

 static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
 			 unsigned long arg)
 {
 	int ret = 0;
 	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

 	if (cmd == FBIO_WAITFORVSYNC) {
 		/* Unmask End of Frame interrupt */
 		writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
 		ret = wait_event_interruptible_timeout(fbi->wait,
 			readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
 		/* Mask back to reduce unwanted interrupt traffic */
 		writel(0xffffffff, fbi->regbase + 0x3c);
 		if (ret < 0)
 			return ret;
 		if (ret == 0)
 			return -ETIMEDOUT;
 	}

 	return ret;
 }

 static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
 				struct fb_info *info)
 {
 	unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
 	unsigned off = pixlen * var->xoffset
 		      + info->fix.line_length * var->yoffset;
 	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

 	writel((1 << 31)
 		| (((var->xres_virtual - var->xres) * pixlen / 4) << 20)
 		| (off >> 2), fbi->regbase + 0x20);
 	return 0;
 }

 static struct fb_ops vt8500lcd_ops = {
 	.owner		= THIS_MODULE,
 	.fb_set_par	= vt8500lcd_set_par,
 	.fb_setcolreg	= vt8500lcd_setcolreg,
 	.fb_fillrect	= wmt_ge_fillrect,
 	.fb_copyarea	= wmt_ge_copyarea,
 	.fb_imageblit	= sys_imageblit,
 	.fb_sync	= wmt_ge_sync,
 	.fb_ioctl	= vt8500lcd_ioctl,
 	.fb_pan_display	= vt8500lcd_pan_display,
 };

 static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
 {
 	struct vt8500lcd_info *fbi = dev_id;

 	if (readl(fbi->regbase + 0x38) & (1 << 3))
 		wake_up_interruptible(&fbi->wait);

 	writel(0xffffffff, fbi->regbase + 0x38);
 	return IRQ_HANDLED;
 }

 static int __devinit vt8500lcd_probe(struct platform_device *pdev)
 {
 	struct vt8500lcd_info *fbi;
 	struct resource *res;
 	struct vt8500fb_platform_data *pdata = pdev->dev.platform_data;
 	void *addr;
 	int irq, ret;

 	ret = -ENOMEM;
 	fbi = NULL;

 	fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16,
 							GFP_KERNEL);
 	if (!fbi) {
 		dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
 		ret = -ENOMEM;
 		goto failed;
 	}

 	strcpy(fbi->fb.fix.id, "VT8500 LCD");

 	fbi->fb.fix.type	= FB_TYPE_PACKED_PIXELS;
 	fbi->fb.fix.xpanstep	= 0;
 	fbi->fb.fix.ypanstep	= 1;
 	fbi->fb.fix.ywrapstep	= 0;
 	fbi->fb.fix.accel	= FB_ACCEL_NONE;

 	fbi->fb.var.nonstd	= 0;
 	fbi->fb.var.activate	= FB_ACTIVATE_NOW;
 	fbi->fb.var.height	= -1;
 	fbi->fb.var.width	= -1;
 	fbi->fb.var.vmode	= FB_VMODE_NONINTERLACED;

 	fbi->fb.fbops		= &vt8500lcd_ops;
 	fbi->fb.flags		= FBINFO_DEFAULT
 				| FBINFO_HWACCEL_COPYAREA
 				| FBINFO_HWACCEL_FILLRECT
 				| FBINFO_HWACCEL_YPAN
 				| FBINFO_VIRTFB
 				| FBINFO_PARTIAL_PAN_OK;
 	fbi->fb.node		= -1;

 	addr = fbi;
 	addr = addr + sizeof(struct vt8500lcd_info);
 	fbi->fb.pseudo_palette	= addr;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "no I/O memory resource defined\n");
 		ret = -ENODEV;
 		goto failed_fbi;
 	}

 	res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
 	if (res == NULL) {
 		dev_err(&pdev->dev, "failed to request I/O memory\n");
 		ret = -EBUSY;
 		goto failed_fbi;
 	}

 	fbi->regbase = ioremap(res->start, resource_size(res));
 	if (fbi->regbase == NULL) {
 		dev_err(&pdev->dev, "failed to map I/O memory\n");
 		ret = -EBUSY;
 		goto failed_free_res;
 	}

 	fbi->fb.fix.smem_start	= pdata->video_mem_phys;
 	fbi->fb.fix.smem_len	= pdata->video_mem_len;
 	fbi->fb.screen_base	= pdata->video_mem_virt;

 	fbi->palette_size	= PAGE_ALIGN(512);
 	fbi->palette_cpu	= dma_alloc_coherent(&pdev->dev,
 						     fbi->palette_size,
 						     &fbi->palette_phys,
 						     GFP_KERNEL);
 	if (fbi->palette_cpu == NULL) {
 		dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
 		ret = -ENOMEM;
 		goto failed_free_io;
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "no IRQ defined\n");
 		ret = -ENODEV;
 		goto failed_free_palette;
 	}

 	ret = request_irq(irq, vt8500lcd_handle_irq, IRQF_DISABLED, "LCD", fbi);
 	if (ret) {
 		dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
 		ret = -EBUSY;
 		goto failed_free_palette;
 	}

 	init_waitqueue_head(&fbi->wait);

 	if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 		dev_err(&pdev->dev, "Failed to allocate color map\n");
 		ret = -ENOMEM;
 		goto failed_free_irq;
 	}

 	fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
 	fbi->fb.var.bits_per_pixel	= pdata->bpp;
 	fbi->fb.var.xres_virtual	= pdata->xres_virtual;
 	fbi->fb.var.yres_virtual	= pdata->yres_virtual;

 	ret = vt8500lcd_set_par(&fbi->fb);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to set parameters\n");
 		goto failed_free_cmap;
 	}

 	writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
 	writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);

 	platform_set_drvdata(pdev, fbi);

 	ret = register_framebuffer(&fbi->fb);
 	if (ret < 0) {
 		dev_err(&pdev->dev,
 			"Failed to register framebuffer device: %d\n", ret);
 		goto failed_free_cmap;
 	}

 	/*
 	 * Ok, now enable the LCD controller
 	 */
 	writel(readl(fbi->regbase) | 1, fbi->regbase);

 	return 0;

 failed_free_cmap:
 	if (fbi->fb.cmap.len)
 		fb_dealloc_cmap(&fbi->fb.cmap);
 failed_free_irq:
 	free_irq(irq, fbi);
 failed_free_palette:
 	dma_free_coherent(&pdev->dev, fbi->palette_size,
 			  fbi->palette_cpu, fbi->palette_phys);
 failed_free_io:
 	iounmap(fbi->regbase);
 failed_free_res:
 	release_mem_region(res->start, resource_size(res));
 failed_fbi:
 	platform_set_drvdata(pdev, NULL);
 	kfree(fbi);
 failed:
 	return ret;
 }

 static int __devexit vt8500lcd_remove(struct platform_device *pdev)
 {
 	struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
 	struct resource *res;
 	int irq;

 	unregister_framebuffer(&fbi->fb);

 	writel(0, fbi->regbase);

 	if (fbi->fb.cmap.len)
 		fb_dealloc_cmap(&fbi->fb.cmap);

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

 	dma_free_coherent(&pdev->dev, fbi->palette_size,
 			  fbi->palette_cpu, fbi->palette_phys);

 	iounmap(fbi->regbase);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(res->start, resource_size(res));

 	kfree(fbi);

 	return 0;
 }

 static struct platform_driver vt8500lcd_driver = {
 	.probe		= vt8500lcd_probe,
 	.remove		= __devexit_p(vt8500lcd_remove),
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= "vt8500-lcd",
 	},
 };

 static int __init vt8500lcd_init(void)
 {
 	return platform_driver_register(&vt8500lcd_driver);
 }

 static void __exit vt8500lcd_exit(void)
 {
 	platform_driver_unregister(&vt8500lcd_driver);
 }

 module_init(vt8500lcd_init);
 module_exit(vt8500lcd_exit);

 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
 MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
 MODULE_LICENSE("GPL");
	/*
	* linux/drivers/video/vt8500lcdfb.c
	*
	* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
	*
	* Based on skeletonfb.c and pxafb.c
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/mm.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/fb.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/dma-mapping.h>
	#include <linux/platform_device.h>
	#include <linux/wait.h>

	#include <mach/vt8500fb.h>

	#include "vt8500lcdfb.h"
	#include "wmt_ge_rops.h"

	#define to_vt8500lcd_info(__info) container_of(__info, \
	struct vt8500lcd_info, fb)

	static int vt8500lcd_set_par(struct fb_info *info)
	{
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	int reg_bpp = 5; /* 16bpp */
	int i;
	unsigned long control0;

	if (!fbi)
	return -EINVAL;

	if (info->var.bits_per_pixel <= 8) {
	/* palettized */
	info->var.red.offset = 0;
	info->var.red.length = info->var.bits_per_pixel;
	info->var.red.msb_right = 0;

	info->var.green.offset = 0;
	info->var.green.length = info->var.bits_per_pixel;
	info->var.green.msb_right = 0;

	info->var.blue.offset = 0;
	info->var.blue.length = info->var.bits_per_pixel;
	info->var.blue.msb_right = 0;

	info->var.transp.offset = 0;
	info->var.transp.length = 0;
	info->var.transp.msb_right = 0;

	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
	info->fix.line_length = info->var.xres_virtual /
	(8/info->var.bits_per_pixel);
	} else {
	/* non-palettized */
	info->var.transp.offset = 0;
	info->var.transp.length = 0;
	info->var.transp.msb_right = 0;

	if (info->var.bits_per_pixel == 16) {
	/* RGB565 */
	info->var.red.offset = 11;
	info->var.red.length = 5;
	info->var.red.msb_right = 0;
	info->var.green.offset = 5;
	info->var.green.length = 6;
	info->var.green.msb_right = 0;
	info->var.blue.offset = 0;
	info->var.blue.length = 5;
	info->var.blue.msb_right = 0;
	} else {
	/* Equal depths per channel */
	info->var.red.offset = info->var.bits_per_pixel
	* 2 / 3;
	info->var.red.length = info->var.bits_per_pixel / 3;
	info->var.red.msb_right = 0;
	info->var.green.offset = info->var.bits_per_pixel / 3;
	info->var.green.length = info->var.bits_per_pixel / 3;
	info->var.green.msb_right = 0;
	info->var.blue.offset = 0;
	info->var.blue.length = info->var.bits_per_pixel / 3;
	info->var.blue.msb_right = 0;
	}

	info->fix.visual = FB_VISUAL_TRUECOLOR;
	info->fix.line_length = info->var.bits_per_pixel > 16 ?
	info->var.xres_virtual << 2 :
	info->var.xres_virtual << 1;
	}

	for (i = 0; i < 8; i++) {
	if (bpp_values[i] == info->var.bits_per_pixel) {
	reg_bpp = i;
	continue;
	}
	}

	control0 = readl(fbi->regbase) & ~0xf;
	writel(0, fbi->regbase);
	while (readl(fbi->regbase + 0x38) & 0x10)
	/* wait */;
	writel((((info->var.hsync_len - 1) & 0x3f) << 26)
	\| ((info->var.left_margin & 0xff) << 18)
	\| (((info->var.xres - 1) & 0x3ff) << 8)
	\| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
	writel((((info->var.vsync_len - 1) & 0x3f) << 26)
	\| ((info->var.upper_margin & 0xff) << 18)
	\| (((info->var.yres - 1) & 0x3ff) << 8)
	\| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
	writel((((info->var.yres - 1) & 0x400) << 2)
	\| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
	writel(0x80000000, fbi->regbase + 0x20);
	writel(control0 \| (reg_bpp << 1) \| 0x100, fbi->regbase);

	return 0;
	}

	static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
	{
	chan &= 0xffff;
	chan >>= 16 - bf->length;
	return chan << bf->offset;
	}

	static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
	unsigned blue, unsigned transp,
	struct fb_info *info) {
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	int ret = 1;
	unsigned int val;
	if (regno >= 256)
	return -EINVAL;

	if (info->var.grayscale)
	red = green = blue =
	(19595 * red + 38470 * green + 7471 * blue) >> 16;

	switch (fbi->fb.fix.visual) {
	case FB_VISUAL_TRUECOLOR:
	if (regno < 16) {
	u32 *pal = fbi->fb.pseudo_palette;

	val = chan_to_field(red, &fbi->fb.var.red);
	val \|= chan_to_field(green, &fbi->fb.var.green);
	val \|= chan_to_field(blue, &fbi->fb.var.blue);

	pal[regno] = val;
	ret = 0;
	}
	break;

	case FB_VISUAL_STATIC_PSEUDOCOLOR:
	case FB_VISUAL_PSEUDOCOLOR:
	writew((red & 0xf800)
	\| ((green >> 5) & 0x7e0)
	\| ((blue >> 11) & 0x1f),
	fbi->palette_cpu + sizeof(u16) * regno);
	break;
	}

	return ret;
	}

	static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
	unsigned long arg)
	{
	int ret = 0;
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

	if (cmd == FBIO_WAITFORVSYNC) {
	/* Unmask End of Frame interrupt */
	writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
	ret = wait_event_interruptible_timeout(fbi->wait,
	readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
	/* Mask back to reduce unwanted interrupt traffic */
	writel(0xffffffff, fbi->regbase + 0x3c);
	if (ret < 0)
	return ret;
	if (ret == 0)
	return -ETIMEDOUT;
	}

	return ret;
	}

	static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
	struct fb_info *info)
	{
	unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
	unsigned off = pixlen * var->xoffset
	+ info->fix.line_length * var->yoffset;
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

	writel((1 << 31)
	\| (((var->xres_virtual - var->xres) * pixlen / 4) << 20)
	\| (off >> 2), fbi->regbase + 0x20);
	return 0;
	}

	static struct fb_ops vt8500lcd_ops = {
	.owner = THIS_MODULE,
	.fb_set_par = vt8500lcd_set_par,
	.fb_setcolreg = vt8500lcd_setcolreg,
	.fb_fillrect = wmt_ge_fillrect,
	.fb_copyarea = wmt_ge_copyarea,
	.fb_imageblit = sys_imageblit,
	.fb_sync = wmt_ge_sync,
	.fb_ioctl = vt8500lcd_ioctl,
	.fb_pan_display = vt8500lcd_pan_display,
	};

	static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
	{
	struct vt8500lcd_info *fbi = dev_id;

	if (readl(fbi->regbase + 0x38) & (1 << 3))
	wake_up_interruptible(&fbi->wait);

	writel(0xffffffff, fbi->regbase + 0x38);
	return IRQ_HANDLED;
	}

	static int __devinit vt8500lcd_probe(struct platform_device *pdev)
	{
	struct vt8500lcd_info *fbi;
	struct resource *res;
	struct vt8500fb_platform_data *pdata = pdev->dev.platform_data;
	void *addr;
	int irq, ret;

	ret = -ENOMEM;
	fbi = NULL;

	fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16,
	GFP_KERNEL);
	if (!fbi) {
	dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
	ret = -ENOMEM;
	goto failed;
	}

	strcpy(fbi->fb.fix.id, "VT8500 LCD");

	fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
	fbi->fb.fix.xpanstep = 0;
	fbi->fb.fix.ypanstep = 1;
	fbi->fb.fix.ywrapstep = 0;
	fbi->fb.fix.accel = FB_ACCEL_NONE;

	fbi->fb.var.nonstd = 0;
	fbi->fb.var.activate = FB_ACTIVATE_NOW;
	fbi->fb.var.height = -1;
	fbi->fb.var.width = -1;
	fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;

	fbi->fb.fbops = &vt8500lcd_ops;
	fbi->fb.flags = FBINFO_DEFAULT
	\| FBINFO_HWACCEL_COPYAREA
	\| FBINFO_HWACCEL_FILLRECT
	\| FBINFO_HWACCEL_YPAN
	\| FBINFO_VIRTFB
	\| FBINFO_PARTIAL_PAN_OK;
	fbi->fb.node = -1;

	addr = fbi;
	addr = addr + sizeof(struct vt8500lcd_info);
	fbi->fb.pseudo_palette = addr;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "no I/O memory resource defined\n");
	ret = -ENODEV;
	goto failed_fbi;
	}

	res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
	if (res == NULL) {
	dev_err(&pdev->dev, "failed to request I/O memory\n");
	ret = -EBUSY;
	goto failed_fbi;
	}

	fbi->regbase = ioremap(res->start, resource_size(res));
	if (fbi->regbase == NULL) {
	dev_err(&pdev->dev, "failed to map I/O memory\n");
	ret = -EBUSY;
	goto failed_free_res;
	}

	fbi->fb.fix.smem_start = pdata->video_mem_phys;
	fbi->fb.fix.smem_len = pdata->video_mem_len;
	fbi->fb.screen_base = pdata->video_mem_virt;

	fbi->palette_size = PAGE_ALIGN(512);
	fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
	fbi->palette_size,
	&fbi->palette_phys,
	GFP_KERNEL);
	if (fbi->palette_cpu == NULL) {
	dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
	ret = -ENOMEM;
	goto failed_free_io;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	dev_err(&pdev->dev, "no IRQ defined\n");
	ret = -ENODEV;
	goto failed_free_palette;
	}

	ret = request_irq(irq, vt8500lcd_handle_irq, IRQF_DISABLED, "LCD", fbi);
	if (ret) {
	dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
	ret = -EBUSY;
	goto failed_free_palette;
	}

	init_waitqueue_head(&fbi->wait);

	if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
	dev_err(&pdev->dev, "Failed to allocate color map\n");
	ret = -ENOMEM;
	goto failed_free_irq;
	}

	fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
	fbi->fb.var.bits_per_pixel = pdata->bpp;
	fbi->fb.var.xres_virtual = pdata->xres_virtual;
	fbi->fb.var.yres_virtual = pdata->yres_virtual;

	ret = vt8500lcd_set_par(&fbi->fb);
	if (ret) {
	dev_err(&pdev->dev, "Failed to set parameters\n");
	goto failed_free_cmap;
	}

	writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
	writel((fbi->palette_phys & 0xfffffe00) \| 1, fbi->regbase + 0x18);

	platform_set_drvdata(pdev, fbi);

	ret = register_framebuffer(&fbi->fb);
	if (ret < 0) {
	dev_err(&pdev->dev,
	"Failed to register framebuffer device: %d\n", ret);
	goto failed_free_cmap;
	}

	/*
	* Ok, now enable the LCD controller
	*/
	writel(readl(fbi->regbase) \| 1, fbi->regbase);

	return 0;

	failed_free_cmap:
	if (fbi->fb.cmap.len)
	fb_dealloc_cmap(&fbi->fb.cmap);
	failed_free_irq:
	free_irq(irq, fbi);
	failed_free_palette:
	dma_free_coherent(&pdev->dev, fbi->palette_size,
	fbi->palette_cpu, fbi->palette_phys);
	failed_free_io:
	iounmap(fbi->regbase);
	failed_free_res:
	release_mem_region(res->start, resource_size(res));
	failed_fbi:
	platform_set_drvdata(pdev, NULL);
	kfree(fbi);
	failed:
	return ret;
	}

	static int __devexit vt8500lcd_remove(struct platform_device *pdev)
	{
	struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
	struct resource *res;
	int irq;

	unregister_framebuffer(&fbi->fb);

	writel(0, fbi->regbase);

	if (fbi->fb.cmap.len)
	fb_dealloc_cmap(&fbi->fb.cmap);

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

	dma_free_coherent(&pdev->dev, fbi->palette_size,
	fbi->palette_cpu, fbi->palette_phys);

	iounmap(fbi->regbase);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	kfree(fbi);

	return 0;
	}

	static struct platform_driver vt8500lcd_driver = {
	.probe = vt8500lcd_probe,
	.remove = __devexit_p(vt8500lcd_remove),
	.driver = {
	.owner = THIS_MODULE,
	.name = "vt8500-lcd",
	},
	};

	static int __init vt8500lcd_init(void)
	{
	return platform_driver_register(&vt8500lcd_driver);
	}

	static void __exit vt8500lcd_exit(void)
	{
	platform_driver_unregister(&vt8500lcd_driver);
	}

	module_init(vt8500lcd_init);
	module_exit(vt8500lcd_exit);

	MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
	MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
	MODULE_LICENSE("GPL");