bf54x-lq043fb: framebuffer driver for Blackfin BF54x framebuffer device driver

Blackfin BF54x framebuffer device driver for a SHARP LQ043T1DG01 TFT LCD

[adaplas]
Add 'fb' suffix to driver name.
Move Makefile entry under platform device section
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/Kconfig

@@ -544,6 +544,15 @@ config FB_VGA16
 	  To compile this driver as a module, choose M here: the
 	  module will be called vga16fb.
 
+config FB_BF54X_LQ043
+	tristate "SHARP LQ043 TFT LCD (BF548 EZKIT)"
+	depends on FB && (BF54x)
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
+	help
+	 This is the framebuffer device driver for a SHARP LQ043T1DG01 TFT LCD
+
 config FB_STI
 	tristate "HP STI frame buffer device support"
 	depends on FB && PARISC

drivers/video/Makefile

@@ -120,6 +120,7 @@ obj-$(CONFIG_FB_VESA)             += vesafb.o
 obj-$(CONFIG_FB_IMAC)             += imacfb.o
 obj-$(CONFIG_FB_VGA16)            += vga16fb.o
 obj-$(CONFIG_FB_OF)               += offb.o
+obj-$(CONFIG_FB_BF54X_LQ043)	  += bf54x-lq043fb.o
 
 # the test framebuffer is last
 obj-$(CONFIG_FB_VIRTUAL)          += vfb.o

drivers/video/bf54x-lq043fb.c

+/*
+ * File:         drivers/video/bf54x-lq043.c
+ * Based on:
+ * Author:       Michael Hennerich <hennerich@blackfin.uclinux.org>
+ *
+ * Created:
+ * Description:  ADSP-BF54x Framebufer driver
+ *
+ *
+ * Modified:
+ *               Copyright 2004-2007 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));
+	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, NULL)) {
+		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);
+	gpio_set_value(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", __FUNCTION__,
+			 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",
+			 __FUNCTION__, 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",
+			 __FUNCTION__, 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;
+
+	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 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 = (struct bfin_bf54xfb_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, (void *)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, 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);

include/asm-blackfin/mach-bf548/bf54x-lq043.h

+#ifndef BF54X_LQ043_H
+#define BF54X_LQ043_H
+
+struct bfin_bf54xfb_val {
+	unsigned int	defval;
+	unsigned int	min;
+	unsigned int	max;
+};
+
+struct bfin_bf54xfb_mach_info {
+	unsigned char	fixed_syncs;	/* do not update sync/border */
+
+	/* LCD types */
+	int		type;
+
+	/* Screen size */
+	int		width;
+	int		height;
+
+	/* Screen info */
+	struct bfin_bf54xfb_val xres;
+	struct bfin_bf54xfb_val yres;
+	struct bfin_bf54xfb_val bpp;
+
+	/* GPIOs */
+	unsigned short 		disp;
+
+};
+
+#endif /* BF54X_LQ043_H */