drivers/video/bf54x-lq043fb.c - kernel/msm-4.9 - Gitiles

 /*
  * File:         drivers/video/bf54x-lq043.c
  * Based on:
  * Author:       Michael Hennerich <hennerich@blackfin.uclinux.org>
  *
  * Created:
  * Description:  ADSP-BF54x Framebufer driver
  *
  *
  * Modified:
  *               Copyright 2007-2008 Analog Devices Inc.
  *
  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see the file COPYING, or write
  * to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/tty.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/fb.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/sched.h>
 #include <linux/timer.h>
 #include <linux/device.h>
 #include <linux/backlight.h>
 #include <linux/lcd.h>
 #include <linux/spinlock.h>
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>

 #include <asm/blackfin.h>
 #include <asm/irq.h>
 #include <asm/dpmc.h>
 #include <asm/dma-mapping.h>
 #include <asm/dma.h>
 #include <asm/gpio.h>
 #include <asm/portmux.h>

 #include <asm/mach/bf54x-lq043.h>

 #define NO_BL_SUPPORT

 #define DRIVER_NAME "bf54x-lq043"
 static char driver_name[] = DRIVER_NAME;

 #define BFIN_LCD_NBR_PALETTE_ENTRIES	256

 #define EPPI0_18 {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2, P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3, \
  P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7, P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, \
  P_PPI0_D11, P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15, P_PPI0_D16, P_PPI0_D17, 0}

 #define EPPI0_24 {P_PPI0_D18, P_PPI0_D19, P_PPI0_D20, P_PPI0_D21, P_PPI0_D22, P_PPI0_D23, 0}

 struct bfin_bf54xfb_info {
 	struct fb_info *fb;
 	struct device *dev;

 	struct bfin_bf54xfb_mach_info *mach_info;

 	unsigned char *fb_buffer;	/* RGB Buffer */

 	dma_addr_t dma_handle;
 	int lq043_mmap;
 	int lq043_open_cnt;
 	int irq;
 	spinlock_t lock;	/* lock */
 };

 static int nocursor;
 module_param(nocursor, int, 0644);
 MODULE_PARM_DESC(nocursor, "cursor enable/disable");

 static int outp_rgb666;
 module_param(outp_rgb666, int, 0);
 MODULE_PARM_DESC(outp_rgb666, "Output 18-bit RGB666");

 #define LCD_X_RES		480	/*Horizontal Resolution */
 #define LCD_Y_RES		272	/* Vertical Resolution */

 #define LCD_BPP			24	/* Bit Per Pixel */
 #define	DMA_BUS_SIZE		32

 /* 	-- Horizontal synchronizing --
  *
  * Timing characteristics taken from the SHARP LQ043T1DG01 datasheet
  * (LCY-W-06602A Page 9 of 22)
  *
  * Clock Frequency 	1/Tc Min 7.83 Typ 9.00 Max 9.26 MHz
  *
  * Period 		TH - 525 - Clock
  * Pulse width 		THp - 41 - Clock
  * Horizontal period 	THd - 480 - Clock
  * Back porch 		THb - 2 - Clock
  * Front porch 		THf - 2 - Clock
  *
  * -- Vertical synchronizing --
  * Period 		TV - 286 - Line
  * Pulse width 		TVp - 10 - Line
  * Vertical period 	TVd - 272 - Line
  * Back porch 		TVb - 2 - Line
  * Front porch 		TVf - 2 - Line
  */

 #define	LCD_CLK         	(8*1000*1000)	/* 8MHz */

 /* # active data to transfer after Horizontal Delay clock */
 #define EPPI_HCOUNT		LCD_X_RES

 /* # active lines to transfer after Vertical Delay clock */
 #define EPPI_VCOUNT		LCD_Y_RES

 /* Samples per Line = 480 (active data) + 45 (padding) */
 #define EPPI_LINE		525

 /* Lines per Frame = 272 (active data) + 14 (padding) */
 #define EPPI_FRAME		286

 /* FS1 (Hsync) Width (Typical)*/
 #define EPPI_FS1W_HBL		41

 /* FS1 (Hsync) Period (Typical) */
 #define EPPI_FS1P_AVPL		EPPI_LINE

 /* Horizontal Delay clock after assertion of Hsync (Typical) */
 #define EPPI_HDELAY		43

 /* FS2 (Vsync) Width    = FS1 (Hsync) Period * 10 */
 #define EPPI_FS2W_LVB		(EPPI_LINE * 10)

  /* FS2 (Vsync) Period   = FS1 (Hsync) Period * Lines per Frame */
 #define EPPI_FS2P_LAVF		(EPPI_LINE * EPPI_FRAME)

 /* Vertical Delay after assertion of Vsync (2 Lines) */
 #define EPPI_VDELAY		12

 #define EPPI_CLIP		0xFF00FF00

 /* EPPI Control register configuration value for RGB out
  * - EPPI as Output
  * GP 2 frame sync mode,
  * Internal Clock generation disabled, Internal FS generation enabled,
  * Receives samples on EPPI_CLK raising edge, Transmits samples on EPPI_CLK falling edge,
  * FS1 & FS2 are active high,
  * DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out)
  * DMA Unpacking disabled when RGB Formating is enabled, otherwise DMA unpacking enabled
  * Swapping Enabled,
  * One (DMA) Channel Mode,
  * RGB Formatting Enabled for RGB666 output, disabled for RGB888 output
  * Regular watermark - when FIFO is 100% full,
  * Urgent watermark - when FIFO is 75% full
  */

 #define EPPI_CONTROL		(0x20136E2E | SWAPEN)

 static inline u16 get_eppi_clkdiv(u32 target_ppi_clk)
 {
 	u32 sclk = get_sclk();

 	/* EPPI_CLK = (SCLK) / (2 * (EPPI_CLKDIV[15:0] + 1)) */

 	return (((sclk / target_ppi_clk) / 2) - 1);
 }

 static void config_ppi(struct bfin_bf54xfb_info *fbi)
 {

 	u16 eppi_clkdiv = get_eppi_clkdiv(LCD_CLK);

 	bfin_write_EPPI0_FS1W_HBL(EPPI_FS1W_HBL);
 	bfin_write_EPPI0_FS1P_AVPL(EPPI_FS1P_AVPL);
 	bfin_write_EPPI0_FS2W_LVB(EPPI_FS2W_LVB);
 	bfin_write_EPPI0_FS2P_LAVF(EPPI_FS2P_LAVF);
 	bfin_write_EPPI0_CLIP(EPPI_CLIP);

 	bfin_write_EPPI0_FRAME(EPPI_FRAME);
 	bfin_write_EPPI0_LINE(EPPI_LINE);

 	bfin_write_EPPI0_HCOUNT(EPPI_HCOUNT);
 	bfin_write_EPPI0_HDELAY(EPPI_HDELAY);
 	bfin_write_EPPI0_VCOUNT(EPPI_VCOUNT);
 	bfin_write_EPPI0_VDELAY(EPPI_VDELAY);

 	bfin_write_EPPI0_CLKDIV(eppi_clkdiv);

 /*
  * DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out)
  * RGB Formatting Enabled for RGB666 output, disabled for RGB888 output
  */
 	if (outp_rgb666)
 		bfin_write_EPPI0_CONTROL((EPPI_CONTROL & ~DLENGTH) | DLEN_18 |
 					 RGB_FMT_EN);
 	else
 		bfin_write_EPPI0_CONTROL(((EPPI_CONTROL & ~DLENGTH) | DLEN_24) &
 					 ~RGB_FMT_EN);


 }

 static int config_dma(struct bfin_bf54xfb_info *fbi)
 {

 	set_dma_config(CH_EPPI0,
 		       set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO,
 					   INTR_DISABLE, DIMENSION_2D,
 					   DATA_SIZE_32,
 					   DMA_NOSYNC_KEEP_DMA_BUF));
 	set_dma_x_count(CH_EPPI0, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE);
 	set_dma_x_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
 	set_dma_y_count(CH_EPPI0, LCD_Y_RES);
 	set_dma_y_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
 	set_dma_start_addr(CH_EPPI0, (unsigned long)fbi->fb_buffer);

 	return 0;
 }

 static int request_ports(struct bfin_bf54xfb_info *fbi)
 {

 	u16 eppi_req_18[] = EPPI0_18;
 	u16 disp = fbi->mach_info->disp;

 	if (gpio_request(disp, DRIVER_NAME)) {
 		printk(KERN_ERR "Requesting GPIO %d faild\n", disp);
 		return -EFAULT;
 	}

 	if (peripheral_request_list(eppi_req_18, DRIVER_NAME)) {
 		printk(KERN_ERR "Requesting Peripherals faild\n");
 		gpio_free(disp);
 		return -EFAULT;
 	}

 	if (!outp_rgb666) {

 		u16 eppi_req_24[] = EPPI0_24;

 		if (peripheral_request_list(eppi_req_24, DRIVER_NAME)) {
 			printk(KERN_ERR "Requesting Peripherals faild\n");
 			peripheral_free_list(eppi_req_18);
 			gpio_free(disp);
 			return -EFAULT;
 		}
 	}

 	gpio_direction_output(disp, 1);

 	return 0;
 }

 static void free_ports(struct bfin_bf54xfb_info *fbi)
 {

 	u16 eppi_req_18[] = EPPI0_18;

 	gpio_free(fbi->mach_info->disp);

 	peripheral_free_list(eppi_req_18);

 	if (!outp_rgb666) {
 		u16 eppi_req_24[] = EPPI0_24;
 		peripheral_free_list(eppi_req_24);
 	}
 }

 static int bfin_bf54x_fb_open(struct fb_info *info, int user)
 {
 	struct bfin_bf54xfb_info *fbi = info->par;

 	spin_lock(&fbi->lock);
 	fbi->lq043_open_cnt++;

 	if (fbi->lq043_open_cnt <= 1) {

 		bfin_write_EPPI0_CONTROL(0);
 		SSYNC();

 		config_dma(fbi);
 		config_ppi(fbi);

 		/* start dma */
 		enable_dma(CH_EPPI0);
 		bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);
 	}

 	spin_unlock(&fbi->lock);

 	return 0;
 }

 static int bfin_bf54x_fb_release(struct fb_info *info, int user)
 {
 	struct bfin_bf54xfb_info *fbi = info->par;

 	spin_lock(&fbi->lock);

 	fbi->lq043_open_cnt--;
 	fbi->lq043_mmap = 0;

 	if (fbi->lq043_open_cnt <= 0) {

 		bfin_write_EPPI0_CONTROL(0);
 		SSYNC();
 		disable_dma(CH_EPPI0);
 		memset(fbi->fb_buffer, 0, info->fix.smem_len);
 	}

 	spin_unlock(&fbi->lock);

 	return 0;
 }

 static int bfin_bf54x_fb_check_var(struct fb_var_screeninfo *var,
 				   struct fb_info *info)
 {

 	if (var->bits_per_pixel != LCD_BPP) {
 		pr_debug("%s: depth not supported: %u BPP\n", __func__,
 			 var->bits_per_pixel);
 		return -EINVAL;
 	}

 	if (info->var.xres != var->xres || info->var.yres != var->yres ||
 	    info->var.xres_virtual != var->xres_virtual ||
 	    info->var.yres_virtual != var->yres_virtual) {
 		pr_debug("%s: Resolution not supported: X%u x Y%u \n",
 			 __func__, var->xres, var->yres);
 		return -EINVAL;
 	}

 	/*
 	 *  Memory limit
 	 */

 	if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
 		pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
 			 __func__, var->yres_virtual);
 		return -ENOMEM;
 	}

 	return 0;
 }

 static int bfin_bf54x_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {

 	struct bfin_bf54xfb_info *fbi = info->par;

 	if (fbi->lq043_mmap)
 		return -1;

 	spin_lock(&fbi->lock);
 	fbi->lq043_mmap = 1;
 	spin_unlock(&fbi->lock);

 	vma->vm_start = (unsigned long)(fbi->fb_buffer);

 	vma->vm_end = vma->vm_start + info->fix.smem_len;
 	/* For those who don't understand how mmap works, go read
 	 *   Documentation/nommu-mmap.txt.
 	 * For those that do, you will know that the VM_MAYSHARE flag
 	 * must be set in the vma->vm_flags structure on noMMU
 	 *   Other flags can be set, and are documented in
 	 *   include/linux/mm.h
 	 */
 	vma->vm_flags |=  VM_MAYSHARE | VM_SHARED;

 	return 0;
 }

 int bfin_bf54x_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 {
 	if (nocursor)
 		return 0;
 	else
 		return -EINVAL;	/* just to force soft_cursor() call */
 }

 static int bfin_bf54x_fb_setcolreg(u_int regno, u_int red, u_int green,
 				   u_int blue, u_int transp,
 				   struct fb_info *info)
 {
 	if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
 		return -EINVAL;

 	if (info->var.grayscale) {
 		/* grayscale = 0.30*R + 0.59*G + 0.11*B */
 		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 	}

 	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {

 		u32 value;
 		/* Place color in the pseudopalette */
 		if (regno > 16)
 			return -EINVAL;

 		red >>= (16 - info->var.red.length);
 		green >>= (16 - info->var.green.length);
 		blue >>= (16 - info->var.blue.length);

 		value = (red << info->var.red.offset) |
 		    (green << info->var.green.offset) |
 		    (blue << info->var.blue.offset);
 		value &= 0xFFFFFF;

 		((u32 *) (info->pseudo_palette))[regno] = value;

 	}

 	return 0;
 }

 static struct fb_ops bfin_bf54x_fb_ops = {
 	.owner = THIS_MODULE,
 	.fb_open = bfin_bf54x_fb_open,
 	.fb_release = bfin_bf54x_fb_release,
 	.fb_check_var = bfin_bf54x_fb_check_var,
 	.fb_fillrect = cfb_fillrect,
 	.fb_copyarea = cfb_copyarea,
 	.fb_imageblit = cfb_imageblit,
 	.fb_mmap = bfin_bf54x_fb_mmap,
 	.fb_cursor = bfin_bf54x_fb_cursor,
 	.fb_setcolreg = bfin_bf54x_fb_setcolreg,
 };

 #ifndef NO_BL_SUPPORT
 static int bl_get_brightness(struct backlight_device *bd)
 {
 	return 0;
 }

 static struct backlight_ops bfin_lq043fb_bl_ops = {
 	.get_brightness = bl_get_brightness,
 };

 static struct backlight_device *bl_dev;

 static int bfin_lcd_get_power(struct lcd_device *dev)
 {
 	return 0;
 }

 static int bfin_lcd_set_power(struct lcd_device *dev, int power)
 {
 	return 0;
 }

 static int bfin_lcd_get_contrast(struct lcd_device *dev)
 {
 	return 0;
 }

 static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
 {

 	return 0;
 }

 static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
 {
 	if (!fi || (fi == &bfin_bf54x_fb))
 		return 1;
 	return 0;
 }

 static struct lcd_ops bfin_lcd_ops = {
 	.get_power = bfin_lcd_get_power,
 	.set_power = bfin_lcd_set_power,
 	.get_contrast = bfin_lcd_get_contrast,
 	.set_contrast = bfin_lcd_set_contrast,
 	.check_fb = bfin_lcd_check_fb,
 };

 static struct lcd_device *lcd_dev;
 #endif

 static irqreturn_t bfin_bf54x_irq_error(int irq, void *dev_id)
 {
 	/*struct bfin_bf54xfb_info *info = dev_id;*/

 	u16 status = bfin_read_EPPI0_STATUS();

 	bfin_write_EPPI0_STATUS(0xFFFF);

 	if (status) {
 		bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN);
 		disable_dma(CH_EPPI0);

 		/* start dma */
 		enable_dma(CH_EPPI0);
 		bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);
 		bfin_write_EPPI0_STATUS(0xFFFF);
 	}

 	return IRQ_HANDLED;
 }

 static int __init bfin_bf54x_probe(struct platform_device *pdev)
 {
 	struct bfin_bf54xfb_info *info;
 	struct fb_info *fbinfo;
 	int ret;

 	printk(KERN_INFO DRIVER_NAME ": FrameBuffer initializing...\n");

 	if (request_dma(CH_EPPI0, "CH_EPPI0") < 0) {
 		printk(KERN_ERR DRIVER_NAME
 		       ": couldn't request CH_EPPI0 DMA\n");
 		ret = -EFAULT;
 		goto out1;
 	}

 	fbinfo =
 	    framebuffer_alloc(sizeof(struct bfin_bf54xfb_info), &pdev->dev);
 	if (!fbinfo) {
 		ret = -ENOMEM;
 		goto out2;
 	}

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

 	platform_set_drvdata(pdev, fbinfo);

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

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

 	if (info->mach_info == NULL) {
 		dev_err(&pdev->dev,
 			"no platform data for lcd, cannot attach\n");
 		ret = -EINVAL;
 		goto out3;
 	}

 	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->fix.visual = FB_VISUAL_TRUECOLOR;

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

 	fbinfo->fbops = &bfin_bf54x_fb_ops;
 	fbinfo->flags = FBINFO_FLAG_DEFAULT;

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

 	fbinfo->var.upper_margin = 0;
 	fbinfo->var.lower_margin = 0;
 	fbinfo->var.vsync_len = 0;

 	fbinfo->var.left_margin = 0;
 	fbinfo->var.right_margin = 0;
 	fbinfo->var.hsync_len = 0;

 	fbinfo->var.red.offset = 16;
 	fbinfo->var.green.offset = 8;
 	fbinfo->var.blue.offset = 0;
 	fbinfo->var.transp.offset = 0;
 	fbinfo->var.red.length = 8;
 	fbinfo->var.green.length = 8;
 	fbinfo->var.blue.length = 8;
 	fbinfo->var.transp.length = 0;
 	fbinfo->fix.smem_len = info->mach_info->xres.max *
 	    info->mach_info->yres.max * info->mach_info->bpp.max / 8;

 	fbinfo->fix.line_length = fbinfo->var.xres_virtual *
 	    fbinfo->var.bits_per_pixel / 8;

 	info->fb_buffer =
 	    dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle,
 			       GFP_KERNEL);

 	if (NULL == info->fb_buffer) {
 		printk(KERN_ERR DRIVER_NAME
 		       ": couldn't allocate dma buffer.\n");
 		ret = -ENOMEM;
 		goto out3;
 	}

 	memset(info->fb_buffer, 0, fbinfo->fix.smem_len);

 	fbinfo->screen_base = (void *)info->fb_buffer;
 	fbinfo->fix.smem_start = (int)info->fb_buffer;

 	fbinfo->fbops = &bfin_bf54x_fb_ops;

 	fbinfo->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 	if (!fbinfo->pseudo_palette) {
 		printk(KERN_ERR DRIVER_NAME
 		       "Fail to allocate pseudo_palette\n");

 		ret = -ENOMEM;
 		goto out4;
 	}

 	memset(fbinfo->pseudo_palette, 0, sizeof(u32) * 16);

 	if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
 	    < 0) {
 		printk(KERN_ERR DRIVER_NAME
 		       "Fail to allocate colormap (%d entries)\n",
 		       BFIN_LCD_NBR_PALETTE_ENTRIES);
 		ret = -EFAULT;
 		goto out5;
 	}

 	if (request_ports(info)) {
 		printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
 		ret = -EFAULT;
 		goto out6;
 	}

 	info->irq = platform_get_irq(pdev, 0);
 	if (info->irq < 0) {
 		ret = -EINVAL;
 		goto out7;
 	}

 	if (request_irq(info->irq, bfin_bf54x_irq_error, IRQF_DISABLED,
 			"PPI ERROR", info) < 0) {
 		printk(KERN_ERR DRIVER_NAME
 		       ": unable to request PPI ERROR IRQ\n");
 		ret = -EFAULT;
 		goto out7;
 	}

 	if (register_framebuffer(fbinfo) < 0) {
 		printk(KERN_ERR DRIVER_NAME
 		       ": unable to register framebuffer.\n");
 		ret = -EINVAL;
 		goto out8;
 	}
 #ifndef NO_BL_SUPPORT
 	bl_dev =
 	    backlight_device_register("bf54x-bl", NULL, NULL,
 				      &bfin_lq043fb_bl_ops);
 	bl_dev->props.max_brightness = 255;

 	lcd_dev = lcd_device_register(DRIVER_NAME, &pdev->dev, NULL, &bfin_lcd_ops);
 	lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
 #endif

 	return 0;

 out8:
 	free_irq(info->irq, info);
 out7:
 	free_ports(info);
 out6:
 	fb_dealloc_cmap(&fbinfo->cmap);
 out5:
 	kfree(fbinfo->pseudo_palette);
 out4:
 	dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
 			  info->dma_handle);
 out3:
 	framebuffer_release(fbinfo);
 out2:
 	free_dma(CH_EPPI0);
 out1:
 	platform_set_drvdata(pdev, NULL);

 	return ret;
 }

 static int bfin_bf54x_remove(struct platform_device *pdev)
 {

 	struct fb_info *fbinfo = platform_get_drvdata(pdev);
 	struct bfin_bf54xfb_info *info = fbinfo->par;

 	free_dma(CH_EPPI0);
 	free_irq(info->irq, info);

 	if (info->fb_buffer != NULL)
 		dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
 				  info->dma_handle);

 	kfree(fbinfo->pseudo_palette);
 	fb_dealloc_cmap(&fbinfo->cmap);

 #ifndef NO_BL_SUPPORT
 	lcd_device_unregister(lcd_dev);
 	backlight_device_unregister(bl_dev);
 #endif

 	unregister_framebuffer(fbinfo);

 	free_ports(info);

 	printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");

 	return 0;
 }

 #ifdef CONFIG_PM
 static int bfin_bf54x_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	struct fb_info *fbinfo = platform_get_drvdata(pdev);
 	struct bfin_bf54xfb_info *info = fbinfo->par;

 	bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN);
 	disable_dma(CH_EPPI0);
 	bfin_write_EPPI0_STATUS(0xFFFF);

 	return 0;
 }

 static int bfin_bf54x_resume(struct platform_device *pdev)
 {
 	struct fb_info *fbinfo = platform_get_drvdata(pdev);
 	struct bfin_bf54xfb_info *info = fbinfo->par;

 	enable_dma(CH_EPPI0);
 	bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);

 	return 0;
 }
 #else
 #define bfin_bf54x_suspend	NULL
 #define bfin_bf54x_resume	NULL
 #endif

 static struct platform_driver bfin_bf54x_driver = {
 	.probe = bfin_bf54x_probe,
 	.remove = bfin_bf54x_remove,
 	.suspend = bfin_bf54x_suspend,
 	.resume = bfin_bf54x_resume,
 	.driver = {
 		   .name = DRIVER_NAME,
 		   .owner = THIS_MODULE,
 		   },
 };

 static int __devinit bfin_bf54x_driver_init(void)
 {
 	return platform_driver_register(&bfin_bf54x_driver);
 }

 static void __exit bfin_bf54x_driver_cleanup(void)
 {
 	platform_driver_unregister(&bfin_bf54x_driver);
 }

 MODULE_DESCRIPTION("Blackfin BF54x TFT LCD Driver");
 MODULE_LICENSE("GPL");

 module_init(bfin_bf54x_driver_init);
 module_exit(bfin_bf54x_driver_cleanup);
	/*
	* File: drivers/video/bf54x-lq043.c
	* Based on:
	* Author: Michael Hennerich <hennerich@blackfin.uclinux.org>
	*
	* Created:
	* Description: ADSP-BF54x Framebufer driver
	*
	*
	* Modified:
	* Copyright 2007-2008 Analog Devices Inc.
	*
	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see the file COPYING, or write
	* to the Free Software Foundation, Inc.,
	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/mm.h>
	#include <linux/tty.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/fb.h>
	#include <linux/ioport.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/interrupt.h>
	#include <linux/sched.h>
	#include <linux/timer.h>
	#include <linux/device.h>
	#include <linux/backlight.h>
	#include <linux/lcd.h>
	#include <linux/spinlock.h>
	#include <linux/dma-mapping.h>
	#include <linux/platform_device.h>

	#include <asm/blackfin.h>
	#include <asm/irq.h>
	#include <asm/dpmc.h>
	#include <asm/dma-mapping.h>
	#include <asm/dma.h>
	#include <asm/gpio.h>
	#include <asm/portmux.h>

	#include <asm/mach/bf54x-lq043.h>

	#define NO_BL_SUPPORT

	#define DRIVER_NAME "bf54x-lq043"
	static char driver_name[] = DRIVER_NAME;

	#define BFIN_LCD_NBR_PALETTE_ENTRIES 256

	#define EPPI0_18 {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2, P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3, \
	P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7, P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, \
	P_PPI0_D11, P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15, P_PPI0_D16, P_PPI0_D17, 0}

	#define EPPI0_24 {P_PPI0_D18, P_PPI0_D19, P_PPI0_D20, P_PPI0_D21, P_PPI0_D22, P_PPI0_D23, 0}

	struct bfin_bf54xfb_info {
	struct fb_info *fb;
	struct device *dev;

	struct bfin_bf54xfb_mach_info *mach_info;

	unsigned char fb_buffer; / RGB Buffer */

	dma_addr_t dma_handle;
	int lq043_mmap;
	int lq043_open_cnt;
	int irq;
	spinlock_t lock; /* lock */
	};

	static int nocursor;
	module_param(nocursor, int, 0644);
	MODULE_PARM_DESC(nocursor, "cursor enable/disable");

	static int outp_rgb666;
	module_param(outp_rgb666, int, 0);
	MODULE_PARM_DESC(outp_rgb666, "Output 18-bit RGB666");

	#define LCD_X_RES 480 /Horizontal Resolution /
	#define LCD_Y_RES 272 /* Vertical Resolution */

	#define LCD_BPP 24 /* Bit Per Pixel */
	#define DMA_BUS_SIZE 32

	/* -- Horizontal synchronizing --
	*
	* Timing characteristics taken from the SHARP LQ043T1DG01 datasheet
	* (LCY-W-06602A Page 9 of 22)
	*
	* Clock Frequency 1/Tc Min 7.83 Typ 9.00 Max 9.26 MHz
	*
	* Period TH - 525 - Clock
	* Pulse width THp - 41 - Clock
	* Horizontal period THd - 480 - Clock
	* Back porch THb - 2 - Clock
	* Front porch THf - 2 - Clock
	*
	* -- Vertical synchronizing --
	* Period TV - 286 - Line
	* Pulse width TVp - 10 - Line
	* Vertical period TVd - 272 - Line
	* Back porch TVb - 2 - Line
	* Front porch TVf - 2 - Line
	*/

	#define LCD_CLK (810001000) /* 8MHz */

	/* # active data to transfer after Horizontal Delay clock */
	#define EPPI_HCOUNT LCD_X_RES

	/* # active lines to transfer after Vertical Delay clock */
	#define EPPI_VCOUNT LCD_Y_RES

	/* Samples per Line = 480 (active data) + 45 (padding) */
	#define EPPI_LINE 525

	/* Lines per Frame = 272 (active data) + 14 (padding) */
	#define EPPI_FRAME 286

	/* FS1 (Hsync) Width (Typical)*/
	#define EPPI_FS1W_HBL 41

	/* FS1 (Hsync) Period (Typical) */
	#define EPPI_FS1P_AVPL EPPI_LINE

	/* Horizontal Delay clock after assertion of Hsync (Typical) */
	#define EPPI_HDELAY 43

	/* FS2 (Vsync) Width = FS1 (Hsync) Period * 10 */
	#define EPPI_FS2W_LVB (EPPI_LINE * 10)

	/* FS2 (Vsync) Period = FS1 (Hsync) Period * Lines per Frame */
	#define EPPI_FS2P_LAVF (EPPI_LINE * EPPI_FRAME)

	/* Vertical Delay after assertion of Vsync (2 Lines) */
	#define EPPI_VDELAY 12

	#define EPPI_CLIP 0xFF00FF00

	/* EPPI Control register configuration value for RGB out
	* - EPPI as Output
	* GP 2 frame sync mode,
	* Internal Clock generation disabled, Internal FS generation enabled,
	* Receives samples on EPPI_CLK raising edge, Transmits samples on EPPI_CLK falling edge,
	* FS1 & FS2 are active high,
	* DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out)
	* DMA Unpacking disabled when RGB Formating is enabled, otherwise DMA unpacking enabled
	* Swapping Enabled,
	* One (DMA) Channel Mode,
	* RGB Formatting Enabled for RGB666 output, disabled for RGB888 output
	* Regular watermark - when FIFO is 100% full,
	* Urgent watermark - when FIFO is 75% full
	*/

	#define EPPI_CONTROL (0x20136E2E \| SWAPEN)

	static inline u16 get_eppi_clkdiv(u32 target_ppi_clk)
	{
	u32 sclk = get_sclk();

	/* EPPI_CLK = (SCLK) / (2 * (EPPI_CLKDIV[15:0] + 1)) */

	return (((sclk / target_ppi_clk) / 2) - 1);
	}

	static void config_ppi(struct bfin_bf54xfb_info *fbi)
	{

	u16 eppi_clkdiv = get_eppi_clkdiv(LCD_CLK);

	bfin_write_EPPI0_FS1W_HBL(EPPI_FS1W_HBL);
	bfin_write_EPPI0_FS1P_AVPL(EPPI_FS1P_AVPL);
	bfin_write_EPPI0_FS2W_LVB(EPPI_FS2W_LVB);
	bfin_write_EPPI0_FS2P_LAVF(EPPI_FS2P_LAVF);
	bfin_write_EPPI0_CLIP(EPPI_CLIP);

	bfin_write_EPPI0_FRAME(EPPI_FRAME);
	bfin_write_EPPI0_LINE(EPPI_LINE);

	bfin_write_EPPI0_HCOUNT(EPPI_HCOUNT);
	bfin_write_EPPI0_HDELAY(EPPI_HDELAY);
	bfin_write_EPPI0_VCOUNT(EPPI_VCOUNT);
	bfin_write_EPPI0_VDELAY(EPPI_VDELAY);

	bfin_write_EPPI0_CLKDIV(eppi_clkdiv);

	/*
	* DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out)
	* RGB Formatting Enabled for RGB666 output, disabled for RGB888 output
	*/
	if (outp_rgb666)
	bfin_write_EPPI0_CONTROL((EPPI_CONTROL & ~DLENGTH) \| DLEN_18 \|
	RGB_FMT_EN);
	else
	bfin_write_EPPI0_CONTROL(((EPPI_CONTROL & ~DLENGTH) \| DLEN_24) &
	~RGB_FMT_EN);


	}

	static int config_dma(struct bfin_bf54xfb_info *fbi)
	{

	set_dma_config(CH_EPPI0,
	set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO,
	INTR_DISABLE, DIMENSION_2D,
	DATA_SIZE_32,
	DMA_NOSYNC_KEEP_DMA_BUF));
	set_dma_x_count(CH_EPPI0, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE);
	set_dma_x_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
	set_dma_y_count(CH_EPPI0, LCD_Y_RES);
	set_dma_y_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
	set_dma_start_addr(CH_EPPI0, (unsigned long)fbi->fb_buffer);

	return 0;
	}

	static int request_ports(struct bfin_bf54xfb_info *fbi)
	{

	u16 eppi_req_18[] = EPPI0_18;
	u16 disp = fbi->mach_info->disp;

	if (gpio_request(disp, DRIVER_NAME)) {
	printk(KERN_ERR "Requesting GPIO %d faild\n", disp);
	return -EFAULT;
	}

	if (peripheral_request_list(eppi_req_18, DRIVER_NAME)) {
	printk(KERN_ERR "Requesting Peripherals faild\n");
	gpio_free(disp);
	return -EFAULT;
	}

	if (!outp_rgb666) {

	u16 eppi_req_24[] = EPPI0_24;

	if (peripheral_request_list(eppi_req_24, DRIVER_NAME)) {
	printk(KERN_ERR "Requesting Peripherals faild\n");
	peripheral_free_list(eppi_req_18);
	gpio_free(disp);
	return -EFAULT;
	}
	}

	gpio_direction_output(disp, 1);

	return 0;
	}

	static void free_ports(struct bfin_bf54xfb_info *fbi)
	{

	u16 eppi_req_18[] = EPPI0_18;

	gpio_free(fbi->mach_info->disp);

	peripheral_free_list(eppi_req_18);

	if (!outp_rgb666) {
	u16 eppi_req_24[] = EPPI0_24;
	peripheral_free_list(eppi_req_24);
	}
	}

	static int bfin_bf54x_fb_open(struct fb_info *info, int user)
	{
	struct bfin_bf54xfb_info *fbi = info->par;

	spin_lock(&fbi->lock);
	fbi->lq043_open_cnt++;

	if (fbi->lq043_open_cnt <= 1) {

	bfin_write_EPPI0_CONTROL(0);
	SSYNC();

	config_dma(fbi);
	config_ppi(fbi);

	/* start dma */
	enable_dma(CH_EPPI0);
	bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() \| EPPI_EN);
	}

	spin_unlock(&fbi->lock);

	return 0;
	}

	static int bfin_bf54x_fb_release(struct fb_info *info, int user)
	{
	struct bfin_bf54xfb_info *fbi = info->par;

	spin_lock(&fbi->lock);

	fbi->lq043_open_cnt--;
	fbi->lq043_mmap = 0;

	if (fbi->lq043_open_cnt <= 0) {

	bfin_write_EPPI0_CONTROL(0);
	SSYNC();
	disable_dma(CH_EPPI0);
	memset(fbi->fb_buffer, 0, info->fix.smem_len);
	}

	spin_unlock(&fbi->lock);

	return 0;
	}

	static int bfin_bf54x_fb_check_var(struct fb_var_screeninfo *var,
	struct fb_info *info)
	{

	if (var->bits_per_pixel != LCD_BPP) {
	pr_debug("%s: depth not supported: %u BPP\n", __func__,
	var->bits_per_pixel);
	return -EINVAL;
	}

	if (info->var.xres != var->xres \|\| info->var.yres != var->yres \|\|
	info->var.xres_virtual != var->xres_virtual \|\|
	info->var.yres_virtual != var->yres_virtual) {
	pr_debug("%s: Resolution not supported: X%u x Y%u \n",
	__func__, var->xres, var->yres);
	return -EINVAL;
	}

	/*
	* Memory limit
	*/

	if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
	pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
	__func__, var->yres_virtual);
	return -ENOMEM;
	}

	return 0;
	}

	static int bfin_bf54x_fb_mmap(struct fb_info info, struct vm_area_struct vma)
	{

	struct bfin_bf54xfb_info *fbi = info->par;

	if (fbi->lq043_mmap)
	return -1;

	spin_lock(&fbi->lock);
	fbi->lq043_mmap = 1;
	spin_unlock(&fbi->lock);

	vma->vm_start = (unsigned long)(fbi->fb_buffer);

	vma->vm_end = vma->vm_start + info->fix.smem_len;
	/* For those who don't understand how mmap works, go read
	* Documentation/nommu-mmap.txt.
	* For those that do, you will know that the VM_MAYSHARE flag
	* must be set in the vma->vm_flags structure on noMMU
	* Other flags can be set, and are documented in
	* include/linux/mm.h
	*/
	vma->vm_flags \|= VM_MAYSHARE \| VM_SHARED;

	return 0;
	}

	int bfin_bf54x_fb_cursor(struct fb_info info, struct fb_cursor cursor)
	{
	if (nocursor)
	return 0;
	else
	return -EINVAL; /* just to force soft_cursor() call */
	}

	static int bfin_bf54x_fb_setcolreg(u_int regno, u_int red, u_int green,
	u_int blue, u_int transp,
	struct fb_info *info)
	{
	if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
	return -EINVAL;

	if (info->var.grayscale) {
	/* grayscale = 0.30R + 0.59G + 0.11B /
	red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
	}

	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {

	u32 value;
	/* Place color in the pseudopalette */
	if (regno > 16)
	return -EINVAL;

	red >>= (16 - info->var.red.length);
	green >>= (16 - info->var.green.length);
	blue >>= (16 - info->var.blue.length);

	value = (red << info->var.red.offset) \|
	(green << info->var.green.offset) \|
	(blue << info->var.blue.offset);
	value &= 0xFFFFFF;

	((u32 *) (info->pseudo_palette))[regno] = value;

	}

	return 0;
	}

	static struct fb_ops bfin_bf54x_fb_ops = {
	.owner = THIS_MODULE,
	.fb_open = bfin_bf54x_fb_open,
	.fb_release = bfin_bf54x_fb_release,
	.fb_check_var = bfin_bf54x_fb_check_var,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	.fb_mmap = bfin_bf54x_fb_mmap,
	.fb_cursor = bfin_bf54x_fb_cursor,
	.fb_setcolreg = bfin_bf54x_fb_setcolreg,
	};

	#ifndef NO_BL_SUPPORT
	static int bl_get_brightness(struct backlight_device *bd)
	{
	return 0;
	}

	static struct backlight_ops bfin_lq043fb_bl_ops = {
	.get_brightness = bl_get_brightness,
	};

	static struct backlight_device *bl_dev;

	static int bfin_lcd_get_power(struct lcd_device *dev)
	{
	return 0;
	}

	static int bfin_lcd_set_power(struct lcd_device *dev, int power)
	{
	return 0;
	}

	static int bfin_lcd_get_contrast(struct lcd_device *dev)
	{
	return 0;
	}

	static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
	{

	return 0;
	}

	static int bfin_lcd_check_fb(struct lcd_device dev, struct fb_info fi)
	{
	if (!fi \|\| (fi == &bfin_bf54x_fb))
	return 1;
	return 0;
	}

	static struct lcd_ops bfin_lcd_ops = {
	.get_power = bfin_lcd_get_power,
	.set_power = bfin_lcd_set_power,
	.get_contrast = bfin_lcd_get_contrast,
	.set_contrast = bfin_lcd_set_contrast,
	.check_fb = bfin_lcd_check_fb,
	};

	static struct lcd_device *lcd_dev;
	#endif

	static irqreturn_t bfin_bf54x_irq_error(int irq, void *dev_id)
	{
	/struct bfin_bf54xfb_info info = dev_id;*/

	u16 status = bfin_read_EPPI0_STATUS();

	bfin_write_EPPI0_STATUS(0xFFFF);

	if (status) {
	bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN);
	disable_dma(CH_EPPI0);

	/* start dma */
	enable_dma(CH_EPPI0);
	bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() \| EPPI_EN);
	bfin_write_EPPI0_STATUS(0xFFFF);
	}

	return IRQ_HANDLED;
	}

	static int __init bfin_bf54x_probe(struct platform_device *pdev)
	{
	struct bfin_bf54xfb_info *info;
	struct fb_info *fbinfo;
	int ret;

	printk(KERN_INFO DRIVER_NAME ": FrameBuffer initializing...\n");

	if (request_dma(CH_EPPI0, "CH_EPPI0") < 0) {
	printk(KERN_ERR DRIVER_NAME
	": couldn't request CH_EPPI0 DMA\n");
	ret = -EFAULT;
	goto out1;
	}

	fbinfo =
	framebuffer_alloc(sizeof(struct bfin_bf54xfb_info), &pdev->dev);
	if (!fbinfo) {
	ret = -ENOMEM;
	goto out2;
	}

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

	platform_set_drvdata(pdev, fbinfo);

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

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

	if (info->mach_info == NULL) {
	dev_err(&pdev->dev,
	"no platform data for lcd, cannot attach\n");
	ret = -EINVAL;
	goto out3;
	}

	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->fix.visual = FB_VISUAL_TRUECOLOR;

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

	fbinfo->fbops = &bfin_bf54x_fb_ops;
	fbinfo->flags = FBINFO_FLAG_DEFAULT;

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

	fbinfo->var.upper_margin = 0;
	fbinfo->var.lower_margin = 0;
	fbinfo->var.vsync_len = 0;

	fbinfo->var.left_margin = 0;
	fbinfo->var.right_margin = 0;
	fbinfo->var.hsync_len = 0;

	fbinfo->var.red.offset = 16;
	fbinfo->var.green.offset = 8;
	fbinfo->var.blue.offset = 0;
	fbinfo->var.transp.offset = 0;
	fbinfo->var.red.length = 8;
	fbinfo->var.green.length = 8;
	fbinfo->var.blue.length = 8;
	fbinfo->var.transp.length = 0;
	fbinfo->fix.smem_len = info->mach_info->xres.max *
	info->mach_info->yres.max * info->mach_info->bpp.max / 8;

	fbinfo->fix.line_length = fbinfo->var.xres_virtual *
	fbinfo->var.bits_per_pixel / 8;

	info->fb_buffer =
	dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle,
	GFP_KERNEL);

	if (NULL == info->fb_buffer) {
	printk(KERN_ERR DRIVER_NAME
	": couldn't allocate dma buffer.\n");
	ret = -ENOMEM;
	goto out3;
	}

	memset(info->fb_buffer, 0, fbinfo->fix.smem_len);

	fbinfo->screen_base = (void *)info->fb_buffer;
	fbinfo->fix.smem_start = (int)info->fb_buffer;

	fbinfo->fbops = &bfin_bf54x_fb_ops;

	fbinfo->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
	if (!fbinfo->pseudo_palette) {
	printk(KERN_ERR DRIVER_NAME
	"Fail to allocate pseudo_palette\n");

	ret = -ENOMEM;
	goto out4;
	}

	memset(fbinfo->pseudo_palette, 0, sizeof(u32) * 16);

	if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
	< 0) {
	printk(KERN_ERR DRIVER_NAME
	"Fail to allocate colormap (%d entries)\n",
	BFIN_LCD_NBR_PALETTE_ENTRIES);
	ret = -EFAULT;
	goto out5;
	}

	if (request_ports(info)) {
	printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
	ret = -EFAULT;
	goto out6;
	}

	info->irq = platform_get_irq(pdev, 0);
	if (info->irq < 0) {
	ret = -EINVAL;
	goto out7;
	}

	if (request_irq(info->irq, bfin_bf54x_irq_error, IRQF_DISABLED,
	"PPI ERROR", info) < 0) {
	printk(KERN_ERR DRIVER_NAME
	": unable to request PPI ERROR IRQ\n");
	ret = -EFAULT;
	goto out7;
	}

	if (register_framebuffer(fbinfo) < 0) {
	printk(KERN_ERR DRIVER_NAME
	": unable to register framebuffer.\n");
	ret = -EINVAL;
	goto out8;
	}
	#ifndef NO_BL_SUPPORT
	bl_dev =
	backlight_device_register("bf54x-bl", NULL, NULL,
	&bfin_lq043fb_bl_ops);
	bl_dev->props.max_brightness = 255;

	lcd_dev = lcd_device_register(DRIVER_NAME, &pdev->dev, NULL, &bfin_lcd_ops);
	lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
	#endif

	return 0;

	out8:
	free_irq(info->irq, info);
	out7:
	free_ports(info);
	out6:
	fb_dealloc_cmap(&fbinfo->cmap);
	out5:
	kfree(fbinfo->pseudo_palette);
	out4:
	dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
	info->dma_handle);
	out3:
	framebuffer_release(fbinfo);
	out2:
	free_dma(CH_EPPI0);
	out1:
	platform_set_drvdata(pdev, NULL);

	return ret;
	}

	static int bfin_bf54x_remove(struct platform_device *pdev)
	{

	struct fb_info *fbinfo = platform_get_drvdata(pdev);
	struct bfin_bf54xfb_info *info = fbinfo->par;

	free_dma(CH_EPPI0);
	free_irq(info->irq, info);

	if (info->fb_buffer != NULL)
	dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
	info->dma_handle);

	kfree(fbinfo->pseudo_palette);
	fb_dealloc_cmap(&fbinfo->cmap);

	#ifndef NO_BL_SUPPORT
	lcd_device_unregister(lcd_dev);
	backlight_device_unregister(bl_dev);
	#endif

	unregister_framebuffer(fbinfo);

	free_ports(info);

	printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");

	return 0;
	}

	#ifdef CONFIG_PM
	static int bfin_bf54x_suspend(struct platform_device *pdev, pm_message_t state)
	{
	struct fb_info *fbinfo = platform_get_drvdata(pdev);
	struct bfin_bf54xfb_info *info = fbinfo->par;

	bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN);
	disable_dma(CH_EPPI0);
	bfin_write_EPPI0_STATUS(0xFFFF);

	return 0;
	}

	static int bfin_bf54x_resume(struct platform_device *pdev)
	{
	struct fb_info *fbinfo = platform_get_drvdata(pdev);
	struct bfin_bf54xfb_info *info = fbinfo->par;

	enable_dma(CH_EPPI0);
	bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() \| EPPI_EN);

	return 0;
	}
	#else
	#define bfin_bf54x_suspend NULL
	#define bfin_bf54x_resume NULL
	#endif

	static struct platform_driver bfin_bf54x_driver = {
	.probe = bfin_bf54x_probe,
	.remove = bfin_bf54x_remove,
	.suspend = bfin_bf54x_suspend,
	.resume = bfin_bf54x_resume,
	.driver = {
	.name = DRIVER_NAME,
	.owner = THIS_MODULE,
	},
	};

	static int __devinit bfin_bf54x_driver_init(void)
	{
	return platform_driver_register(&bfin_bf54x_driver);
	}

	static void __exit bfin_bf54x_driver_cleanup(void)
	{
	platform_driver_unregister(&bfin_bf54x_driver);
	}

	MODULE_DESCRIPTION("Blackfin BF54x TFT LCD Driver");
	MODULE_LICENSE("GPL");

	module_init(bfin_bf54x_driver_init);
	module_exit(bfin_bf54x_driver_cleanup);