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From: weitway@gmail.com
To: linux-arm-kernel@lists.infradead.org
Cc: s.hauer@pengutronix.de, eric.miao@linaro.org,
 Jason Chen <b02280@freescale.com>, Jason Chen <Jason.Chen@freescale.com>,
 Jason Chen <Jason.Chen@linaro.org>
Subject: [PATCH 3/9] Add i.MX5 framebuffer driver
Date: Mon, 25 Apr 2011 21:39:02 +0800
Message-Id: <1303738742-27594-1-git-send-email-weitway@gmail.com>
X-Mailer: git-send-email 1.7.1

From: Jason Chen <b02280@freescale.com>

This patch adds framebuffer support to the Freescale i.MX SoCs
equipped with an IPU v3, so far these are the i.MX51/53.

This driver has been tested on the i.MX51 babbage board with
both DVI and analog VGA in different resolutions and color depths.
It has also been tested on a custom i.MX51 board using a fixed
resolution panel.

On i.MX53, it has been tested on the i.MX51 loco board with
WVGA LCD panel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jason Chen <Jason.Chen@freescale.com>
Signed-off-by: Jason Chen <Jason.Chen@linaro.org>
---
 drivers/video/Kconfig  |   11 +
 drivers/video/Makefile |    1 +
 drivers/video/mx5fb.c  |  952 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 964 insertions(+), 0 deletions(-)

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index ef502b8..ab92938 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -2297,6 +2297,17 @@ config FB_MX3
 	  far only synchronous displays are supported. If you plan to use
 	  an LCD display with your i.MX31 system, say Y here.
 
+config FB_MX5
+	tristate "MX5 Framebuffer support"
+	depends on FB && FB_IMX_IPU_V3
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
+	select FB_MODE_HELPERS
+	help
+	  This is a framebuffer device for the i.MX5 LCD Controller. If you
+	  plan to use an LCD display with your i.MX5 system, say Y here.
+
 config FB_BROADSHEET
 	tristate "E-Ink Broadsheet/Epson S1D13521 controller support"
 	depends on FB
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index d40faf5..554b051 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -153,6 +153,7 @@ obj-$(CONFIG_FB_BFIN_LQ035Q1)     += bfin-lq035q1-fb.o
 obj-$(CONFIG_FB_BFIN_T350MCQB)	  += bfin-t350mcqb-fb.o
 obj-$(CONFIG_FB_BFIN_7393)        += bfin_adv7393fb.o
 obj-$(CONFIG_FB_MX3)		  += mx3fb.o
+obj-$(CONFIG_FB_MX5)		  += mx5fb.o
 obj-$(CONFIG_FB_DA8XX)		  += da8xx-fb.o
 obj-$(CONFIG_FB_MXS)		  += mxsfb.o
 obj-$(CONFIG_FB_IMX_IPU_V3)	  += imx-ipu-v3/
diff --git a/drivers/video/mx5fb.c b/drivers/video/mx5fb.c
new file mode 100644
index 0000000..98e0f73
--- /dev/null
+++ b/drivers/video/mx5fb.c
@@ -0,0 +1,952 @@
+/*
+ * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * Framebuffer Framebuffer Driver for SDC
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/fb.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/mfd/core.h>
+#include <linux/dma-mapping.h>
+#include <linux/console.h>
+#include <video/imx-ipu-v3.h>
+#include <asm/uaccess.h>
+#include <mach/ipu-v3.h>
+
+#define DRIVER_NAME "imx-ipuv3-fb"
+
+struct imx_ipu_fb_info {
+	void			*ipu;
+	int			ipu_channel_num;
+	struct ipu_channel	*ipu_ch;
+	struct dc_channel	*dc_ch;
+	int			di_no;
+	u32			ipu_di_pix_fmt;
+	u32			ipu_in_pix_fmt;
+
+	u32			pseudo_palette[16];
+
+	struct ipu_dp		*dp;
+	struct dmfc_channel	*dmfc;
+	struct ipu_di		*di;
+	struct fb_info		*slave;
+	struct fb_info		*master;
+	bool			enabled;
+
+	/* overlay specific fields */
+	bool			blank_state;
+	int			ovlxres, ovlyres;
+};
+
+static int imx_ipu_fb_set_fix(struct fb_info *info)
+{
+	struct fb_fix_screeninfo *fix = &info->fix;
+	struct fb_var_screeninfo *var = &info->var;
+
+	fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
+
+	fix->type = FB_TYPE_PACKED_PIXELS;
+	fix->accel = FB_ACCEL_NONE;
+	fix->visual = FB_VISUAL_TRUECOLOR;
+	fix->xpanstep = 0;
+	fix->ypanstep = 1;
+	fix->ywrapstep = 1;
+
+	return 0;
+}
+
+static int imx_ipu_fb_map_video_memory(struct fb_info *fbi)
+{
+	int size;
+
+	size = fbi->var.yres_virtual * fbi->fix.line_length;
+
+	if (fbi->screen_base) {
+		if (fbi->fix.smem_len >= size)
+			return 0;
+		else {
+			dev_err(fbi->device,
+				"Framebuffer memory is not enough for (%d)\n", size);
+			fbi->fix.smem_len = 0;
+			fbi->fix.smem_start = 0;
+			return -ENOMEM;
+		}
+	}
+
+	fbi->screen_base = dma_alloc_writecombine(fbi->device,
+				size,
+				(dma_addr_t *)&fbi->fix.smem_start,
+				GFP_DMA);
+	if (fbi->screen_base == 0) {
+		dev_err(fbi->device, "Unable to allocate framebuffer memory (%d)\n",
+				size);
+		fbi->fix.smem_len = 0;
+		fbi->fix.smem_start = 0;
+		return -ENOMEM;
+	}
+
+	fbi->fix.smem_len = size;
+	fbi->screen_size = fbi->fix.smem_len;
+
+	dev_dbg(fbi->device, "allocated fb @ paddr=0x%08lx, size=%d\n",
+		fbi->fix.smem_start, fbi->fix.smem_len);
+
+	/* Clear the screen */
+	memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);
+
+	return 0;
+}
+
+static void imx_ipu_fb_enable(struct fb_info *fbi)
+{
+	struct imx_ipu_fb_info *mxc_fbi = fbi->par;
+
+	if (mxc_fbi->enabled)
+		return;
+
+	ipu_di_enable(mxc_fbi->di);
+	ipu_dmfc_enable_channel(mxc_fbi->dmfc);
+	ipu_idmac_enable_channel(mxc_fbi->ipu_ch);
+	ipu_dc_enable_channel(mxc_fbi->dc_ch);
+	if (mxc_fbi->dp)
+		ipu_dp_enable_channel(mxc_fbi->dp);
+	mxc_fbi->enabled = 1;
+}
+
+static void imx_ipu_fb_disable(struct fb_info *fbi)
+{
+	struct imx_ipu_fb_info *mxc_fbi = fbi->par;
+
+	if (!mxc_fbi->enabled)
+		return;
+
+	if (mxc_fbi->dp)
+		ipu_dp_disable_channel(mxc_fbi->dp);
+	ipu_dc_disable_channel(mxc_fbi->dc_ch);
+	ipu_idmac_disable_channel(mxc_fbi->ipu_ch);
+	ipu_dmfc_disable_channel(mxc_fbi->dmfc);
+	ipu_di_disable(mxc_fbi->di);
+
+	mxc_fbi->enabled = 0;
+}
+
+static int calc_vref(struct fb_var_screeninfo *var)
+{
+	unsigned long htotal, vtotal;
+
+	htotal = var->xres + var->right_margin + var->hsync_len + var->left_margin;
+	vtotal = var->yres + var->lower_margin + var->vsync_len + var->upper_margin;
+
+	if (!htotal || !vtotal)
+		return 60;
+
+	return PICOS2KHZ(var->pixclock) * 1000 / vtotal / htotal;
+}
+
+static int calc_bandwidth(struct fb_var_screeninfo *var, unsigned int vref)
+{
+	return var->xres * var->yres * vref;
+}
+
+static int imx_ipu_fb_set_par(struct fb_info *fbi)
+{
+	int ret;
+	struct ipu_di_signal_cfg sig_cfg;
+	struct imx_ipu_fb_info *mxc_fbi = fbi->par;
+	u32 out_pixel_fmt;
+	int interlaced = 0;
+	struct fb_var_screeninfo *var = &fbi->var;
+	int enabled = mxc_fbi->enabled;
+
+	dev_dbg(fbi->device, "Reconfiguring framebuffer %dx%d-%d\n",
+		fbi->var.xres, fbi->var.yres, fbi->var.bits_per_pixel);
+
+	if (enabled)
+		imx_ipu_fb_disable(fbi);
+
+	fbi->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
+
+	ret = imx_ipu_fb_map_video_memory(fbi);
+	if (ret)
+		return ret;
+
+	if (var->vmode & FB_VMODE_INTERLACED)
+		interlaced = 1;
+
+	memset(&sig_cfg, 0, sizeof(sig_cfg));
+	out_pixel_fmt = mxc_fbi->ipu_di_pix_fmt;
+
+	if (var->vmode & FB_VMODE_INTERLACED)
+		sig_cfg.interlaced = 1;
+	if (var->vmode & FB_VMODE_ODD_FLD_FIRST) /* PAL */
+		sig_cfg.odd_field_first = 1;
+	if (var->sync & FB_SYNC_EXT)
+		sig_cfg.ext_clk = 1;
+	if (var->sync & FB_SYNC_HOR_HIGH_ACT)
+		sig_cfg.Hsync_pol = 1;
+	if (var->sync & FB_SYNC_VERT_HIGH_ACT)
+		sig_cfg.Vsync_pol = 1;
+	if (!(var->sync & FB_SYNC_CLK_LAT_FALL))
+		sig_cfg.clk_pol = 1;
+	if (var->sync & FB_SYNC_DATA_INVERT)
+		sig_cfg.data_pol = 1;
+	if (!(var->sync & FB_SYNC_OE_LOW_ACT))
+		sig_cfg.enable_pol = 1;
+	if (var->sync & FB_SYNC_CLK_IDLE_EN)
+		sig_cfg.clkidle_en = 1;
+
+	dev_dbg(fbi->device, "pixclock = %lu.%03lu MHz\n",
+		PICOS2KHZ(var->pixclock) / 1000,
+		PICOS2KHZ(var->pixclock) % 1000);
+
+	sig_cfg.width = var->xres;
+	sig_cfg.height = var->yres;
+	sig_cfg.pixel_fmt = out_pixel_fmt;
+	sig_cfg.h_start_width = var->left_margin;
+	sig_cfg.h_sync_width = var->hsync_len;
+	sig_cfg.h_end_width = var->right_margin;
+	sig_cfg.v_start_width = var->upper_margin;
+	sig_cfg.v_sync_width = var->vsync_len;
+	sig_cfg.v_end_width = var->lower_margin;
+	sig_cfg.v_to_h_sync = 0;
+
+	if (mxc_fbi->dp) {
+		ret = ipu_dp_setup_channel(mxc_fbi->dp, mxc_fbi->ipu_in_pix_fmt,
+				out_pixel_fmt, 1);
+		if (ret) {
+			dev_dbg(fbi->device, "initializing display processor failed with %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	ret = ipu_dc_init_sync(mxc_fbi->dc_ch, mxc_fbi->di_no, interlaced,
+			out_pixel_fmt, fbi->var.xres);
+	if (ret) {
+		dev_dbg(fbi->device, "initializing display controller failed with %d\n",
+				ret);
+		return ret;
+	}
+
+	ret = ipu_di_init_sync_panel(mxc_fbi->di,
+				PICOS2KHZ(var->pixclock) * 1000UL,
+				&sig_cfg);
+	if (ret) {
+		dev_dbg(fbi->device, "initializing panel failed with %d\n",
+				ret);
+		return ret;
+	}
+
+	fbi->mode = (struct fb_videomode *)fb_match_mode(var, &fbi->modelist);
+	var->xoffset = var->yoffset = 0;
+
+	if (fbi->var.vmode & FB_VMODE_INTERLACED)
+		interlaced = 1;
+
+	ret = ipu_idmac_init_channel_buffer(mxc_fbi->ipu_ch,
+					mxc_fbi->ipu_in_pix_fmt,
+					var->xres, var->yres,
+					fbi->fix.line_length,
+					IPU_ROTATE_NONE,
+					fbi->fix.smem_start,
+					0,
+					0, 0, interlaced);
+	if (ret) {
+		dev_dbg(fbi->device, "init channel buffer failed with %d\n",
+				ret);
+		return ret;
+	}
+
+	ret = ipu_dmfc_init_channel(mxc_fbi->dmfc, var->xres);
+	if (ret) {
+		dev_dbg(fbi->device, "initializing dmfc channel failed with %d\n",
+				ret);
+		return ret;
+	}
+
+	ret = ipu_dmfc_alloc_bandwidth(mxc_fbi->dmfc, calc_bandwidth(var, calc_vref(var)));
+	if (ret) {
+		dev_dbg(fbi->device, "allocating dmfc bandwidth failed with %d\n",
+				ret);
+		return ret;
+	}
+
+	if (enabled)
+		imx_ipu_fb_enable(fbi);
+
+	return ret;
+}
+
+/*
+ * These are the bitfields for each
+ * display depth that we support.
+ */
+struct imxfb_rgb {
+	struct fb_bitfield	red;
+	struct fb_bitfield	green;
+	struct fb_bitfield	blue;
+	struct fb_bitfield	transp;
+};
+
+static struct imxfb_rgb def_rgb_8 = {
+	.red	= { .offset =  5, .length = 3, },
+	.green	= { .offset =  2, .length = 3, },
+	.blue	= { .offset =  0, .length = 2, },
+	.transp = { .offset =  0, .length = 0, },
+};
+
+static struct imxfb_rgb def_rgb_16 = {
+	.red	= { .offset = 11, .length = 5, },
+	.green	= { .offset =  5, .length = 6, },
+	.blue	= { .offset =  0, .length = 5, },
+	.transp = { .offset =  0, .length = 0, },
+};
+
+static struct imxfb_rgb def_rgb_24 = {
+	.red	= { .offset = 16, .length = 8, },
+	.green	= { .offset =  8, .length = 8, },
+	.blue	= { .offset =  0, .length = 8, },
+	.transp = { .offset =  0, .length = 0, },
+};
+
+static struct imxfb_rgb def_rgb_32 = {
+	.red	= { .offset = 16, .length = 8, },
+	.green	= { .offset =  8, .length = 8, },
+	.blue	= { .offset =  0, .length = 8, },
+	.transp = { .offset = 24, .length = 8, },
+};
+
+/*
+ * Check framebuffer variable parameters and adjust to valid values.
+ *
+ * @param       var      framebuffer variable parameters
+ *
+ * @param       info     framebuffer information pointer
+ */
+static int imx_ipu_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	struct imx_ipu_fb_info *mxc_fbi = info->par;
+	struct imxfb_rgb *rgb;
+
+	/* we don't support xpan, force xres_virtual to be equal to xres */
+	var->xres_virtual = var->xres;
+
+	if (var->yres_virtual < var->yres)
+		var->yres_virtual = var->yres;
+
+	switch (var->bits_per_pixel) {
+	case 8:
+		rgb = &def_rgb_8;
+		break;
+	case 16:
+		rgb = &def_rgb_16;
+		mxc_fbi->ipu_in_pix_fmt = IPU_PIX_FMT_RGB565;
+		break;
+	case 24:
+		rgb = &def_rgb_24;
+		mxc_fbi->ipu_in_pix_fmt = IPU_PIX_FMT_BGR24;
+		break;
+	case 32:
+		rgb = &def_rgb_32;
+		mxc_fbi->ipu_in_pix_fmt = IPU_PIX_FMT_BGR32;
+		break;
+	default:
+		var->bits_per_pixel = 24;
+		rgb = &def_rgb_24;
+		mxc_fbi->ipu_in_pix_fmt = IPU_PIX_FMT_BGR24;
+	}
+
+	var->red    = rgb->red;
+	var->green  = rgb->green;
+	var->blue   = rgb->blue;
+	var->transp = rgb->transp;
+
+	return 0;
+}
+
+static inline unsigned int chan_to_field(u_int chan, struct fb_bitfield *bf)
+{
+	chan &= 0xffff;
+	chan >>= 16 - bf->length;
+	return chan << bf->offset;
+}
+
+static int imx_ipu_fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			   u_int trans, struct fb_info *fbi)
+{
+	unsigned int val;
+	int ret = 1;
+
+	/*
+	 * If greyscale is true, then we convert the RGB value
+	 * to greyscale no matter what visual we are using.
+	 */
+	if (fbi->var.grayscale)
+		red = green = blue = (19595 * red + 38470 * green +
+				      7471 * blue) >> 16;
+	switch (fbi->fix.visual) {
+	case FB_VISUAL_TRUECOLOR:
+		/*
+		 * 16-bit True Colour.  We encode the RGB value
+		 * according to the RGB bitfield information.
+		 */
+		if (regno < 16) {
+			u32 *pal = fbi->pseudo_palette;
+
+			val = chan_to_field(red, &fbi->var.red);
+			val |= chan_to_field(green, &fbi->var.green);
+			val |= chan_to_field(blue, &fbi->var.blue);
+
+			pal[regno] = val;
+			ret = 0;
+		}
+		break;
+
+	case FB_VISUAL_STATIC_PSEUDOCOLOR:
+	case FB_VISUAL_PSEUDOCOLOR:
+		break;
+	}
+
+	return ret;
+}
+
+static void imx_ipu_fb_enable_overlay(struct fb_info *fbi);
+static void imx_ipu_fb_disable_overlay(struct fb_info *fbi);
+
+static int imx_ipu_fb_blank(int blank, struct fb_info *info)
+{
+	struct imx_ipu_fb_info *mxc_fbi = info->par;
+
+	dev_dbg(info->device, "blank = %d\n", blank);
+
+	switch (blank) {
+	case FB_BLANK_POWERDOWN:
+	case FB_BLANK_VSYNC_SUSPEND:
+	case FB_BLANK_HSYNC_SUSPEND:
+	case FB_BLANK_NORMAL:
+		if (mxc_fbi->slave)
+			imx_ipu_fb_disable_overlay(mxc_fbi->slave);
+		imx_ipu_fb_disable(info);
+		break;
+	case FB_BLANK_UNBLANK:
+		imx_ipu_fb_enable(info);
+		if (mxc_fbi->slave)
+			imx_ipu_fb_enable_overlay(mxc_fbi->slave);
+		break;
+	}
+
+	return 0;
+}
+
+static int imx_ipu_fb_pan_display(struct fb_var_screeninfo *var,
+		struct fb_info *info)
+{
+	struct imx_ipu_fb_info *mxc_fbi = info->par;
+	unsigned long base;
+	int ret;
+
+	if (info->var.yoffset == var->yoffset)
+		return 0;	/* No change, do nothing */
+
+	base = var->yoffset * var->xres_virtual * var->bits_per_pixel / 8;
+	base += info->fix.smem_start;
+
+	ret = ipu_wait_for_interrupt(mxc_fbi->ipu,
+			IPU_IRQ_EOF(mxc_fbi->ipu_channel_num), 100);
+	if (ret)
+		return ret;
+
+	if (ipu_idmac_update_channel_buffer(mxc_fbi->ipu_ch, 0, base)) {
+		dev_err(info->device,
+			"Error updating SDC buf to address=0x%08lX\n", base);
+	}
+
+	info->var.yoffset = var->yoffset;
+
+	return 0;
+}
+
+static struct fb_ops imx_ipu_fb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_set_par	= imx_ipu_fb_set_par,
+	.fb_check_var	= imx_ipu_fb_check_var,
+	.fb_setcolreg	= imx_ipu_fb_setcolreg,
+	.fb_pan_display	= imx_ipu_fb_pan_display,
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+	.fb_blank	= imx_ipu_fb_blank,
+};
+
+/*
+ * Overlay functions
+ */
+static void imx_ipu_fb_enable_overlay(struct fb_info *fbi)
+{
+	struct imx_ipu_fb_info *mxc_fbi = fbi->par;
+
+	/*
+	 * This function is called unconditionally from imx_ipu_fb_blank to
+	 * enable/disable the overlay when the background is (un)blanked. So
+	 * we decide upon blank_state whether we should actually enable the
+	 * overlay.
+	 */
+	if (!mxc_fbi->blank_state)
+		return;
+
+	if (mxc_fbi->enabled)
+		return;
+
+	ipu_dmfc_enable_channel(mxc_fbi->dmfc);
+	ipu_idmac_enable_channel(mxc_fbi->ipu_ch);
+	ipu_dp_enable_fg(mxc_fbi->dp);
+	mxc_fbi->enabled = 1;
+	ipu_dp_set_color_key(mxc_fbi->dp, 1, 0x434343);
+}
+
+static void imx_ipu_fb_disable_overlay(struct fb_info *fbi)
+{
+	struct imx_ipu_fb_info *mxc_fbi = fbi->par;
+
+	if (!mxc_fbi->enabled)
+		return;
+
+	ipu_dp_disable_fg(mxc_fbi->dp);
+	ipu_wait_for_interrupt(mxc_fbi->ipu, IPU_IRQ_BG_SF_END, 100);
+	ipu_idmac_disable_channel(mxc_fbi->ipu_ch);
+	ipu_dmfc_disable_channel(mxc_fbi->dmfc);
+	mxc_fbi->enabled = 0;
+}
+
+#define NONSTD_TO_XPOS(x)	(((x) >> 0)  & 0xfff)
+#define NONSTD_TO_YPOS(x)	(((x) >> 12) & 0xfff)
+#define NONSTD_TO_ALPHA(x)	(((x) >> 24) & 0xff)
+
+static int imx_ipu_fb_check_var_overlay(struct fb_var_screeninfo *var,
+		struct fb_info *info)
+{
+	struct imx_ipu_fb_info *mxc_fbi = info->par;
+	struct fb_info *fbi_master = mxc_fbi->master;
+	struct fb_var_screeninfo *var_master = &fbi_master->var;
+	int ret;
+	static int xpos, ypos;
+
+	xpos = NONSTD_TO_XPOS(var->nonstd);
+	ypos = NONSTD_TO_YPOS(var->nonstd);
+
+	ret = imx_ipu_fb_check_var(var, info);
+	if (ret)
+		return ret;
+
+	if (var->xres + xpos > var_master->xres)
+		return -EINVAL;
+	if (var->yres + ypos > var_master->yres)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int imx_ipu_fb_set_par_overlay(struct fb_info *fbi)
+{
+	struct imx_ipu_fb_info *mxc_fbi = fbi->par;
+	struct fb_var_screeninfo *var = &fbi->var;
+	struct fb_info *fbi_master = mxc_fbi->master;
+	struct imx_ipu_fb_info *mxc_fbi_master = fbi_master->par;
+	struct fb_var_screeninfo *var_master = &fbi_master->var;
+	int ret;
+	int interlaced = 0;
+	int enabled = mxc_fbi->enabled;
+	int xpos, ypos, alpha;
+	int resolution_change;
+
+	dev_dbg(fbi->device, "Reconfiguring framebuffer %dx%d-%d\n",
+		fbi->var.xres, fbi->var.yres, fbi->var.bits_per_pixel);
+
+	resolution_change = mxc_fbi->ovlxres != var->xres ||
+		mxc_fbi->ovlyres != var->yres;
+
+	if (enabled && resolution_change)
+		imx_ipu_fb_disable_overlay(fbi);
+
+	fbi->fix.line_length = var->xres_virtual *
+				var->bits_per_pixel / 8;
+
+	xpos = NONSTD_TO_XPOS(var->nonstd);
+	ypos = NONSTD_TO_YPOS(var->nonstd);
+	alpha = NONSTD_TO_ALPHA(var->nonstd);
+
+	if (resolution_change) {
+		ret = imx_ipu_fb_map_video_memory(fbi);
+		if (ret)
+			return ret;
+	}
+
+	if (!resolution_change && enabled)
+		ipu_wait_for_interrupt(mxc_fbi_master->ipu,
+			IPU_IRQ_EOF(mxc_fbi_master->ipu_channel_num), 100);
+
+	ipu_dp_set_window_pos(mxc_fbi->dp, xpos, ypos);
+	ipu_dp_set_global_alpha(mxc_fbi->dp, 1, alpha, 1);
+
+	var->xoffset = var->yoffset = 0;
+
+	if (resolution_change) {
+		if (var->vmode & FB_VMODE_INTERLACED)
+			interlaced = 1;
+
+		ret = ipu_idmac_init_channel_buffer(mxc_fbi->ipu_ch,
+					mxc_fbi->ipu_in_pix_fmt,
+					var->xres, var->yres,
+					fbi->fix.line_length,
+					IPU_ROTATE_NONE,
+					fbi->fix.smem_start,
+					0,
+					0, 0, interlaced);
+		if (ret) {
+			dev_dbg(fbi->device, "init channel buffer failed with %d\n",
+				ret);
+			return ret;
+		}
+
+		ret = ipu_dmfc_init_channel(mxc_fbi->dmfc, var->xres);
+		if (ret) {
+			dev_dbg(fbi->device, "initializing dmfc channel failed with %d\n",
+				ret);
+			return ret;
+		}
+
+		ret = ipu_dmfc_alloc_bandwidth(mxc_fbi->dmfc, calc_bandwidth(var, calc_vref(var_master)));
+		if (ret) {
+			dev_dbg(fbi->device, "allocating dmfc bandwidth failed with %d\n",
+				ret);
+			return ret;
+		}
+		mxc_fbi->ovlxres = var->xres;
+		mxc_fbi->ovlyres = var->yres;
+	}
+
+	if (enabled && resolution_change)
+		imx_ipu_fb_enable_overlay(fbi);
+
+	return ret;
+}
+
+static int imx_ipu_fb_blank_overlay(int blank, struct fb_info *fbi)
+{
+	struct imx_ipu_fb_info *mxc_fbi = fbi->par;
+
+	dev_dbg(fbi->device, "blank = %d\n", blank);
+
+	switch (blank) {
+	case FB_BLANK_POWERDOWN:
+	case FB_BLANK_VSYNC_SUSPEND:
+	case FB_BLANK_HSYNC_SUSPEND:
+	case FB_BLANK_NORMAL:
+		mxc_fbi->blank_state = 0;
+		imx_ipu_fb_disable_overlay(fbi);
+		break;
+	case FB_BLANK_UNBLANK:
+		mxc_fbi->blank_state = 1;
+		imx_ipu_fb_enable_overlay(fbi);
+		break;
+	}
+
+	return 0;
+}
+
+static struct fb_ops imx_ipu_fb_overlay_ops = {
+	.owner		= THIS_MODULE,
+	.fb_set_par	= imx_ipu_fb_set_par_overlay,
+	.fb_check_var	= imx_ipu_fb_check_var_overlay,
+	.fb_setcolreg	= imx_ipu_fb_setcolreg,
+	.fb_pan_display	= imx_ipu_fb_pan_display,
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+	.fb_blank	= imx_ipu_fb_blank_overlay,
+};
+
+static struct fb_info *imx_ipu_fb_init_fbinfo(struct device *dev, struct fb_ops *ops)
+{
+	struct fb_info *fbi;
+	struct imx_ipu_fb_info *mxc_fbi;
+
+	fbi = framebuffer_alloc(sizeof(struct imx_ipu_fb_info), dev);
+	if (!fbi)
+		return NULL;
+
+	BUG_ON(fbi->par == NULL);
+	mxc_fbi = fbi->par;
+
+	fbi->var.activate = FB_ACTIVATE_NOW;
+
+	fbi->fbops = ops;
+	fbi->flags = FBINFO_FLAG_DEFAULT;
+	fbi->pseudo_palette = mxc_fbi->pseudo_palette;
+
+	fb_alloc_cmap(&fbi->cmap, 16, 0);
+
+	return fbi;
+}
+
+static int imx_ipu_fb_init_overlay(struct platform_device *pdev,
+		struct fb_info *fbi_master, int ipu_channel)
+{
+	struct imx_ipu_fb_info *mxc_fbi_master = fbi_master->par;
+	struct fb_info *ovlfbi;
+	struct imx_ipu_fb_info *ovl_mxc_fbi;
+	int ret;
+
+	ovlfbi = imx_ipu_fb_init_fbinfo(&pdev->dev, &imx_ipu_fb_overlay_ops);
+	if (!ovlfbi)
+		return -ENOMEM;
+
+	ovl_mxc_fbi = ovlfbi->par;
+	ovl_mxc_fbi->ipu_ch =
+		ipu_idmac_get(mxc_fbi_master->ipu, ipu_channel);
+	ovl_mxc_fbi->dmfc =
+		ipu_dmfc_get(mxc_fbi_master->ipu, ipu_channel);
+	ovl_mxc_fbi->di = NULL;
+	ovl_mxc_fbi->dp = mxc_fbi_master->dp;
+	ovl_mxc_fbi->master = fbi_master;
+	mxc_fbi_master->slave = ovlfbi;
+
+	ovlfbi->var.xres = 240;
+	ovlfbi->var.yres = 320;
+	ovlfbi->var.yres_virtual = ovlfbi->var.yres;
+	ovlfbi->var.xres_virtual = ovlfbi->var.xres;
+	imx_ipu_fb_check_var(&ovlfbi->var, ovlfbi);
+	imx_ipu_fb_set_fix(ovlfbi);
+
+	ret = register_framebuffer(ovlfbi);
+	if (ret) {
+		framebuffer_release(ovlfbi);
+		return ret;
+	}
+
+	ipu_dp_set_global_alpha(ovl_mxc_fbi->dp, 0, 0, 1);
+	ipu_dp_set_color_key(ovl_mxc_fbi->dp, 1, 0x434343);
+
+	imx_ipu_fb_set_par_overlay(ovlfbi);
+
+	return 0;
+}
+
+static void imx_ipu_fb_exit_overlay(struct platform_device *pdev,
+		struct fb_info *fbi_master, int ipu_channel)
+{
+	struct imx_ipu_fb_info *mxc_fbi_master = fbi_master->par;
+	struct fb_info *ovlfbi = mxc_fbi_master->slave;
+	struct imx_ipu_fb_info *ovl_mxc_fbi = ovlfbi->par;
+
+	imx_ipu_fb_blank_overlay(FB_BLANK_POWERDOWN, ovlfbi);
+
+	unregister_framebuffer(ovlfbi);
+
+	ipu_idmac_put(ovl_mxc_fbi->ipu_ch);
+	ipu_dmfc_free_bandwidth(ovl_mxc_fbi->dmfc);
+	ipu_dmfc_put(ovl_mxc_fbi->dmfc);
+
+	framebuffer_release(ovlfbi);
+}
+
+static int imx_ipu_fb_find_mode(struct fb_info *fbi)
+{
+	int ret;
+	struct fb_videomode *mode_array;
+	struct fb_modelist *modelist;
+	struct fb_var_screeninfo *var = &fbi->var;
+	int i = 0;
+
+	list_for_each_entry(modelist, &fbi->modelist, list)
+		i++;
+
+	mode_array = kmalloc(sizeof (struct fb_modelist) * i, GFP_KERNEL);
+	if (!mode_array)
+		return -ENOMEM;
+
+	i = 0;
+	list_for_each_entry(modelist, &fbi->modelist, list)
+		mode_array[i++] = modelist->mode;
+
+	ret = fb_find_mode(&fbi->var, fbi, NULL, mode_array, i, NULL, 16);
+	if (ret == 0)
+		return -EINVAL;
+
+	dev_dbg(fbi->device, "found %dx%d-%d hs:%d:%d:%d vs:%d:%d:%d\n",
+			var->xres, var->yres, var->bits_per_pixel,
+			var->hsync_len, var->left_margin, var->right_margin,
+			var->vsync_len, var->upper_margin, var->lower_margin);
+
+	kfree(mode_array);
+
+	return 0;
+}
+
+static int __devinit imx_ipu_fb_probe(struct platform_device *pdev)
+{
+	struct fb_info *fbi;
+	struct imx_ipu_fb_info *mxc_fbi;
+	struct ipuv3_fb_platform_data *plat_data = mfd_get_data(pdev);
+	int ret = 0, i;
+
+	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+	fbi = imx_ipu_fb_init_fbinfo(&pdev->dev, &imx_ipu_fb_ops);
+	if (!fbi)
+		return -ENOMEM;
+
+	mxc_fbi = fbi->par;
+
+	mxc_fbi->ipu = ipu_get_soc(plat_data->ipu);
+	if (IS_ERR(mxc_fbi->ipu))
+		return -ENODEV;
+	mxc_fbi->ipu_channel_num = plat_data->ipu_channel_bg;
+	mxc_fbi->ipu_di_pix_fmt = plat_data->interface_pix_fmt;
+	mxc_fbi->di_no = plat_data->display;
+
+	mxc_fbi->ipu_ch = ipu_idmac_get(mxc_fbi->ipu, plat_data->ipu_channel_bg);
+	if (IS_ERR(mxc_fbi->ipu_ch)) {
+		ret = PTR_ERR(mxc_fbi->ipu_ch);
+		goto failed_request_ipu;
+	}
+
+	mxc_fbi->dmfc = ipu_dmfc_get(mxc_fbi->ipu, plat_data->ipu_channel_bg);
+	if (IS_ERR(mxc_fbi->ipu_ch)) {
+		ret = PTR_ERR(mxc_fbi->ipu_ch);
+		goto failed_request_dmfc;
+	}
+
+	mxc_fbi->dc_ch = ipu_dc_get(mxc_fbi->ipu, plat_data->dc_channel);
+	if (IS_ERR(mxc_fbi->dc_ch)) {
+		ret = PTR_ERR(mxc_fbi->dc_ch);
+		goto failed_request_dc;
+	}
+
+	if (plat_data->dp_channel >= 0) {
+		mxc_fbi->dp = ipu_dp_get(mxc_fbi->ipu);
+		if (IS_ERR(mxc_fbi->dp)) {
+			ret = PTR_ERR(mxc_fbi->ipu_ch);
+			goto failed_request_dp;
+		}
+	}
+
+	mxc_fbi->di = ipu_di_get(mxc_fbi->ipu, plat_data->display);
+	if (IS_ERR(mxc_fbi->di)) {
+		ret = PTR_ERR(mxc_fbi->di);
+		goto failed_request_di;
+	}
+
+	fbi->var.yres_virtual = fbi->var.yres;
+
+	INIT_LIST_HEAD(&fbi->modelist);
+	for (i = 0; i < plat_data->num_modes; i++)
+		fb_add_videomode(&plat_data->modes[i], &fbi->modelist);
+
+	imx_ipu_fb_find_mode(fbi);
+
+	imx_ipu_fb_check_var(&fbi->var, fbi);
+	imx_ipu_fb_set_fix(fbi);
+	ret = register_framebuffer(fbi);
+	if (ret < 0)
+		goto failed_register;
+
+	imx_ipu_fb_set_par(fbi);
+	imx_ipu_fb_blank(FB_BLANK_UNBLANK, fbi);
+
+	if (plat_data->ipu_channel_fg >= 0 && plat_data->flags & IMX_IPU_FB_USE_OVERLAY)
+		imx_ipu_fb_init_overlay(pdev, fbi, plat_data->ipu_channel_fg);
+
+	platform_set_drvdata(pdev, fbi);
+
+	return 0;
+
+failed_register:
+	ipu_di_put(mxc_fbi->di);
+failed_request_di:
+	if (plat_data->dp_channel >= 0)
+		ipu_dp_put(mxc_fbi->dp);
+failed_request_dp:
+	ipu_dc_put(mxc_fbi->dc_ch);
+failed_request_dc:
+	ipu_dmfc_put(mxc_fbi->dmfc);
+failed_request_dmfc:
+	ipu_idmac_put(mxc_fbi->ipu_ch);
+failed_request_ipu:
+	fb_dealloc_cmap(&fbi->cmap);
+	framebuffer_release(fbi);
+
+	return ret;
+}
+
+static int __devexit imx_ipu_fb_remove(struct platform_device *pdev)
+{
+	struct fb_info *fbi = platform_get_drvdata(pdev);
+	struct imx_ipu_fb_info *mxc_fbi = fbi->par;
+	struct ipuv3_fb_platform_data *plat_data = pdev->dev.platform_data;
+
+	if (plat_data->ipu_channel_fg >= 0 && plat_data->flags & IMX_IPU_FB_USE_OVERLAY)
+		imx_ipu_fb_exit_overlay(pdev, fbi, plat_data->ipu_channel_fg);
+
+	imx_ipu_fb_blank(FB_BLANK_POWERDOWN, fbi);
+
+	dma_free_writecombine(fbi->device, fbi->fix.smem_len,
+			      fbi->screen_base, fbi->fix.smem_start);
+
+	if (&fbi->cmap)
+		fb_dealloc_cmap(&fbi->cmap);
+
+	unregister_framebuffer(fbi);
+
+	if (plat_data->dp_channel >= 0)
+		ipu_dp_put(mxc_fbi->dp);
+	ipu_dmfc_free_bandwidth(mxc_fbi->dmfc);
+	ipu_dmfc_put(mxc_fbi->dmfc);
+	ipu_di_put(mxc_fbi->di);
+	ipu_idmac_put(mxc_fbi->ipu_ch);
+
+	framebuffer_release(fbi);
+
+	return 0;
+}
+
+static struct platform_driver imx_ipu_fb_driver = {
+	.driver = {
+		.name = DRIVER_NAME,
+	},
+	.probe = imx_ipu_fb_probe,
+	.remove = __devexit_p(imx_ipu_fb_remove),
+};
+
+static int __init imx_ipu_fb_init(void)
+{
+	return platform_driver_register(&imx_ipu_fb_driver);
+}
+
+static void __exit imx_ipu_fb_exit(void)
+{
+	platform_driver_unregister(&imx_ipu_fb_driver);
+}
+
+module_init(imx_ipu_fb_init);
+module_exit(imx_ipu_fb_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("i.MX framebuffer driver");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("fb");