[PATCH] mbxfb: Add framebuffer driver for the Intel 2700G

Add frame buffer driver for the 2700G LCD controller present on CompuLab
CM-X270 computer module.

[adaplas]
- Add more informative help text to Kconfig
- Make DEBUG a Kconfig option as FB_MBX_DEBUG
- Remove #include mbxdebug.c, this is frowned upon
- Remove redundant casts
- Arrange #include's alphabetically
- Trivial whitespace

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 683 insertions, 0 deletions

diff --git a/drivers/video/mbx/mbxfb.c b/drivers/video/mbx/mbxfb.c
new file mode 100644
index 00000000000..6849ab75d40
--- /dev/null
+++ b/drivers/video/mbx/mbxfb.c
@@ -0,0 +1,683 @@
+/*
+ *  linux/drivers/video/mbx/mbxfb.c
+ *
+ *  Copyright (C) 2006 Compulab, Ltd.
+ *  Mike Rapoport <mike@compulab.co.il>
+ *
+ *   Based on pxafb.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ *   Intel 2700G (Marathon) Graphics Accelerator Frame Buffer Driver
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+
+#include <video/mbxfb.h>
+
+#include "regs.h"
+#include "reg_bits.h"
+
+static unsigned long virt_base_2700;
+
+#define MIN_XRES	16
+#define MIN_YRES	16
+#define MAX_XRES	2048
+#define MAX_YRES	2048
+
+#define MAX_PALETTES	16
+
+/* FIXME: take care of different chip revisions with different sizes
+   of ODFB */
+#define MEMORY_OFFSET	0x60000
+
+struct mbxfb_info {
+	struct device *dev;
+
+	struct resource *fb_res;
+	struct resource *fb_req;
+
+	struct resource *reg_res;
+	struct resource *reg_req;
+
+	void __iomem *fb_virt_addr;
+	unsigned long fb_phys_addr;
+
+	void __iomem *reg_virt_addr;
+	unsigned long reg_phys_addr;
+
+	int (*platform_probe) (struct fb_info * fb);
+	int (*platform_remove) (struct fb_info * fb);
+
+	u32 pseudo_palette[MAX_PALETTES];
+#ifdef CONFIG_FB_MBX_DEBUG
+	void *debugfs_data;
+#endif
+
+};
+
+static struct fb_var_screeninfo mbxfb_default __devinitdata = {
+	.xres = 640,
+	.yres = 480,
+	.xres_virtual = 640,
+	.yres_virtual = 480,
+	.bits_per_pixel = 16,
+	.red = {11, 5, 0},
+	.green = {5, 6, 0},
+	.blue = {0, 5, 0},
+	.activate = FB_ACTIVATE_TEST,
+	.height = -1,
+	.width = -1,
+	.pixclock = 40000,
+	.left_margin = 48,
+	.right_margin = 16,
+	.upper_margin = 33,
+	.lower_margin = 10,
+	.hsync_len = 96,
+	.vsync_len = 2,
+	.vmode = FB_VMODE_NONINTERLACED,
+	.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+};
+
+static struct fb_fix_screeninfo mbxfb_fix  __devinitdata = {
+	.id = "MBX",
+	.type = FB_TYPE_PACKED_PIXELS,
+	.visual = FB_VISUAL_TRUECOLOR,
+	.xpanstep = 0,
+	.ypanstep = 0,
+	.ywrapstep = 0,
+	.accel = FB_ACCEL_NONE,
+};
+
+struct pixclock_div {
+	u8 m;
+	u8 n;
+	u8 p;
+};
+
+static unsigned int mbxfb_get_pixclock(unsigned int pixclock_ps,
+				       struct pixclock_div *div)
+{
+	u8 m, n, p;
+	unsigned int err = 0;
+	unsigned int min_err = ~0x0;
+	unsigned int clk;
+	unsigned int best_clk = 0;
+	unsigned int ref_clk = 13000;	/* FIXME: take from platform data */
+	unsigned int pixclock;
+
+	/* convert pixclock to KHz */
+	pixclock = PICOS2KHZ(pixclock_ps);
+
+	for (m = 1; m < 64; m++) {
+		for (n = 1; n < 8; n++) {
+			for (p = 0; p < 8; p++) {
+				clk = (ref_clk * m) / (n * (1 << p));
+				err = (clk > pixclock) ? (clk - pixclock) :
+					(pixclock - clk);
+				if (err < min_err) {
+					min_err = err;
+					best_clk = clk;
+					div->m = m;
+					div->n = n;
+					div->p = p;
+				}
+			}
+		}
+	}
+	return KHZ2PICOS(best_clk);
+}
+
+static int mbxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			   u_int trans, struct fb_info *info)
+{
+	u32 val, ret = 1;
+
+	if (regno < MAX_PALETTES) {
+		u32 *pal = info->pseudo_palette;
+
+		val = (red & 0xf800) | ((green & 0xfc00) >> 5) |
+			((blue & 0xf800) >> 11);
+		pal[regno] = val;
+		ret = 0;
+	}
+
+	return ret;
+}
+
+static int mbxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	struct pixclock_div div;
+
+	var->pixclock = mbxfb_get_pixclock(var->pixclock, &div);
+
+	if (var->xres < MIN_XRES)
+		var->xres = MIN_XRES;
+	if (var->yres < MIN_YRES)
+		var->yres = MIN_YRES;
+	if (var->xres > MAX_XRES)
+		return -EINVAL;
+	if (var->yres > MAX_YRES)
+		return -EINVAL;
+	var->xres_virtual = max(var->xres_virtual, var->xres);
+	var->yres_virtual = max(var->yres_virtual, var->yres);
+
+	switch (var->bits_per_pixel) {
+		/* 8 bits-per-pixel is not supported yet */
+	case 8:
+		return -EINVAL;
+	case 16:
+		var->green.length = (var->green.length == 5) ? 5 : 6;
+		var->red.length = 5;
+		var->blue.length = 5;
+		var->transp.length = 6 - var->green.length;
+		var->blue.offset = 0;
+		var->green.offset = 5;
+		var->red.offset = 5 + var->green.length;
+		var->transp.offset = (5 + var->red.offset) & 15;
+		break;
+	case 24:		/* RGB 888   */
+	case 32:		/* RGBA 8888 */
+		var->red.offset = 16;
+		var->red.length = 8;
+		var->green.offset = 8;
+		var->green.length = 8;
+		var->blue.offset = 0;
+		var->blue.length = 8;
+		var->transp.length = var->bits_per_pixel - 24;
+		var->transp.offset = (var->transp.length) ? 24 : 0;
+		break;
+	}
+	var->red.msb_right = 0;
+	var->green.msb_right = 0;
+	var->blue.msb_right = 0;
+	var->transp.msb_right = 0;
+
+	return 0;
+}
+
+static int mbxfb_set_par(struct fb_info *info)
+{
+	struct fb_var_screeninfo *var = &info->var;
+	struct pixclock_div div;
+	ushort hbps, ht, hfps, has;
+	ushort vbps, vt, vfps, vas;
+	u32 gsctrl = readl(GSCTRL);
+	u32 gsadr = readl(GSADR);
+
+	info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
+
+	/* setup color mode */
+	gsctrl &= ~(FMsk(GSCTRL_GPIXFMT));
+	/* FIXME: add *WORKING* support for 8-bits per color */
+	if (info->var.bits_per_pixel == 8) {
+		return -EINVAL;
+	} else {
+		fb_dealloc_cmap(&info->cmap);
+		gsctrl &= ~GSCTRL_LUT_EN;
+
+		info->fix.visual = FB_VISUAL_TRUECOLOR;
+		switch (info->var.bits_per_pixel) {
+		case 16:
+			if (info->var.green.length == 5)
+				gsctrl |= GSCTRL_GPIXFMT_ARGB1555;
+			else
+				gsctrl |= GSCTRL_GPIXFMT_RGB565;
+			break;
+		case 24:
+			gsctrl |= GSCTRL_GPIXFMT_RGB888;
+			break;
+		case 32:
+			gsctrl |= GSCTRL_GPIXFMT_ARGB8888;
+			break;
+		}
+	}
+
+	/* setup resolution */
+	gsctrl &= ~(FMsk(GSCTRL_GSWIDTH) | FMsk(GSCTRL_GSHEIGHT));
+	gsctrl |= Gsctrl_Width(info->var.xres - 1) |
+		Gsctrl_Height(info->var.yres - 1);
+	writel(gsctrl, GSCTRL);
+	udelay(1000);
+
+	gsadr &= ~(FMsk(GSADR_SRCSTRIDE));
+	gsadr |= Gsadr_Srcstride(info->var.xres * info->var.bits_per_pixel /
+				 (8 * 16) - 1);
+	writel(gsadr, GSADR);
+	udelay(1000);
+
+	/* setup timings */
+	var->pixclock = mbxfb_get_pixclock(info->var.pixclock, &div);
+
+	writel((Disp_Pll_M(div.m) | Disp_Pll_N(div.n) |
+		Disp_Pll_P(div.p) | DISP_PLL_EN), DISPPLL);
+
+	hbps = var->hsync_len;
+	has = hbps + var->left_margin;
+	hfps = has + var->xres;
+	ht = hfps + var->right_margin;
+
+	vbps = var->vsync_len;
+	vas = vbps + var->upper_margin;
+	vfps = vas + var->yres;
+	vt = vfps + var->lower_margin;
+
+	writel((Dht01_Hbps(hbps) | Dht01_Ht(ht)), DHT01);
+	writel((Dht02_Hlbs(has) | Dht02_Has(has)), DHT02);
+	writel((Dht03_Hfps(hfps) | Dht03_Hrbs(hfps)), DHT03);
+	writel((Dhdet_Hdes(has) | Dhdet_Hdef(hfps)), DHDET);
+
+	writel((Dvt01_Vbps(vbps) | Dvt01_Vt(vt)), DVT01);
+	writel((Dvt02_Vtbs(vas) | Dvt02_Vas(vas)), DVT02);
+	writel((Dvt03_Vfps(vfps) | Dvt03_Vbbs(vfps)), DVT03);
+	writel((Dvdet_Vdes(vas) | Dvdet_Vdef(vfps)), DVDET);
+	writel((Dvectrl_Vevent(vfps) | Dvectrl_Vfetch(vbps)), DVECTRL);
+
+	writel((readl(DSCTRL) | DSCTRL_SYNCGEN_EN), DSCTRL);
+
+	return 0;
+}
+
+static int mbxfb_blank(int blank, struct fb_info *info)
+{
+	switch (blank) {
+	case FB_BLANK_POWERDOWN:
+	case FB_BLANK_VSYNC_SUSPEND:
+	case FB_BLANK_HSYNC_SUSPEND:
+	case FB_BLANK_NORMAL:
+		writel((readl(DSCTRL) & ~DSCTRL_SYNCGEN_EN), DSCTRL);
+		udelay(1000);
+		writel((readl(PIXCLK) & ~PIXCLK_EN), PIXCLK);
+		udelay(1000);
+		writel((readl(VOVRCLK) & ~VOVRCLK_EN), VOVRCLK);
+		udelay(1000);
+		break;
+	case FB_BLANK_UNBLANK:
+		writel((readl(DSCTRL) | DSCTRL_SYNCGEN_EN), DSCTRL);
+		udelay(1000);
+		writel((readl(PIXCLK) | PIXCLK_EN), PIXCLK);
+		udelay(1000);
+		break;
+	}
+	return 0;
+}
+
+static struct fb_ops mbxfb_ops = {
+	.owner = THIS_MODULE,
+	.fb_check_var = mbxfb_check_var,
+	.fb_set_par = mbxfb_set_par,
+	.fb_setcolreg = mbxfb_setcolreg,
+	.fb_fillrect = cfb_fillrect,
+	.fb_copyarea = cfb_copyarea,
+	.fb_imageblit = cfb_imageblit,
+	.fb_blank = mbxfb_blank,
+};
+
+/*
+  Enable external SDRAM controller. Assume that all clocks are active
+  by now.
+*/
+static void __devinit setup_memc(struct fb_info *fbi)
+{
+	struct mbxfb_info *mfbi = fbi->par;
+	unsigned long tmp;
+	int i;
+
+	/* FIXME: use platfrom specific parameters */
+	/* setup SDRAM controller */
+	writel((LMCFG_LMC_DS | LMCFG_LMC_TS | LMCFG_LMD_TS |
+		LMCFG_LMA_TS),
+	       LMCFG);
+	udelay(1000);
+
+	writel(LMPWR_MC_PWR_ACT, LMPWR);
+	udelay(1000);
+
+	/* setup SDRAM timings */
+	writel((Lmtim_Tras(7) | Lmtim_Trp(3) | Lmtim_Trcd(3) |
+		Lmtim_Trc(9) | Lmtim_Tdpl(2)),
+	       LMTIM);
+	udelay(1000);
+	/* setup SDRAM refresh rate */
+	writel(0xc2b, LMREFRESH);
+	udelay(1000);
+	/* setup SDRAM type parameters */
+	writel((LMTYPE_CASLAT_3 | LMTYPE_BKSZ_2 | LMTYPE_ROWSZ_11 |
+		LMTYPE_COLSZ_8),
+	       LMTYPE);
+	udelay(1000);
+	/* enable memory controller */
+	writel(LMPWR_MC_PWR_ACT, LMPWR);
+	udelay(1000);
+
+	/* perform dummy reads */
+	for ( i = 0; i < 16; i++ ) {
+		tmp = readl(fbi->screen_base);
+	}
+}
+
+static void enable_clocks(struct fb_info *fbi)
+{
+	/* enable clocks */
+	writel(SYSCLKSRC_PLL_2, SYSCLKSRC);
+	udelay(1000);
+	writel(PIXCLKSRC_PLL_1, PIXCLKSRC);
+	udelay(1000);
+	writel(0x00000000, CLKSLEEP);
+	udelay(1000);
+	writel((Core_Pll_M(0x17) | Core_Pll_N(0x3) | Core_Pll_P(0x0) |
+		CORE_PLL_EN),
+	       COREPLL);
+	udelay(1000);
+	writel((Disp_Pll_M(0x1b) | Disp_Pll_N(0x7) | Disp_Pll_P(0x1) |
+		DISP_PLL_EN),
+	       DISPPLL);
+
+	writel(0x00000000, VOVRCLK);
+	udelay(1000);
+	writel(PIXCLK_EN, PIXCLK);
+	udelay(1000);
+	writel(MEMCLK_EN, MEMCLK);
+	udelay(1000);
+	writel(0x00000006, M24CLK);
+	udelay(1000);
+	writel(0x00000006, MBXCLK);
+	udelay(1000);
+	writel(SDCLK_EN, SDCLK);
+	udelay(1000);
+	writel(0x00000001, PIXCLKDIV);
+	udelay(1000);
+}
+
+static void __devinit setup_graphics(struct fb_info *fbi)
+{
+	unsigned long gsctrl;
+
+	gsctrl = GSCTRL_GAMMA_EN | Gsctrl_Width(fbi->var.xres - 1) |
+		Gsctrl_Height(fbi->var.yres - 1);
+	switch (fbi->var.bits_per_pixel) {
+	case 16:
+		if (fbi->var.green.length == 5)
+			gsctrl |= GSCTRL_GPIXFMT_ARGB1555;
+		else
+			gsctrl |= GSCTRL_GPIXFMT_RGB565;
+		break;
+	case 24:
+		gsctrl |= GSCTRL_GPIXFMT_RGB888;
+		break;
+	case 32:
+		gsctrl |= GSCTRL_GPIXFMT_ARGB8888;
+		break;
+	}
+
+	writel(gsctrl, GSCTRL);
+	udelay(1000);
+	writel(0x00000000, GBBASE);
+	udelay(1000);
+	writel(0x00ffffff, GDRCTRL);
+	udelay(1000);
+	writel((GSCADR_STR_EN | Gscadr_Gbase_Adr(0x6000)), GSCADR);
+	udelay(1000);
+	writel(0x00000000, GPLUT);
+	udelay(1000);
+}
+
+static void __devinit setup_display(struct fb_info *fbi)
+{
+	unsigned long dsctrl = 0;
+
+	dsctrl = DSCTRL_BLNK_POL;
+	if (fbi->var.sync & FB_SYNC_HOR_HIGH_ACT)
+		dsctrl |= DSCTRL_HS_POL;
+	if (fbi->var.sync & FB_SYNC_VERT_HIGH_ACT)
+		dsctrl |= DSCTRL_VS_POL;
+	writel(dsctrl, DSCTRL);
+	udelay(1000);
+	writel(0xd0303010, DMCTRL);
+	udelay(1000);
+	writel((readl(DSCTRL) | DSCTRL_SYNCGEN_EN), DSCTRL);
+}
+
+static void __devinit enable_controller(struct fb_info *fbi)
+{
+	writel(SYSRST_RST, SYSRST);
+	udelay(1000);
+
+
+	enable_clocks(fbi);
+	setup_memc(fbi);
+	setup_graphics(fbi);
+	setup_display(fbi);
+}
+
+#ifdef CONFIG_PM
+/*
+ * Power management hooks.  Note that we won't be called from IRQ context,
+ * unlike the blank functions above, so we may sleep.
+ */
+static int mbxfb_suspend(struct platform_device *dev, pm_message_t state)
+{
+	/* make frame buffer memory enter self-refresh mode */
+	writel(LMPWR_MC_PWR_SRM, LMPWR);
+	while (LMPWRSTAT != LMPWRSTAT_MC_PWR_SRM)
+		; /* empty statement */
+
+	/* reset the device, since it's initial state is 'mostly sleeping' */
+	writel(SYSRST_RST, SYSRST);
+	return 0;
+}
+
+static int mbxfb_resume(struct platform_device *dev)
+{
+	struct fb_info *fbi = platform_get_drvdata(dev);
+
+	enable_clocks(fbi);
+/* 	setup_graphics(fbi); */
+/* 	setup_display(fbi); */
+
+	writel((readl(DSCTRL) | DSCTRL_SYNCGEN_EN), DSCTRL);
+	return 0;
+}
+#else
+#define mbxfb_suspend	NULL
+#define mbxfb_resume	NULL
+#endif
+
+/* debugfs entries */
+#ifndef CONFIG_FB_MBX_DEBUG
+#define mbxfb_debugfs_init(x)	do {} while(0)
+#define mbxfb_debugfs_remove(x)	do {} while(0)
+#endif
+
+#define res_size(_r) (((_r)->end - (_r)->start) + 1)
+
+static int __devinit mbxfb_probe(struct platform_device *dev)
+{
+	int ret;
+	struct fb_info *fbi;
+	struct mbxfb_info *mfbi;
+	struct mbxfb_platform_data *pdata;
+
+	dev_dbg(dev, "mbxfb_probe\n");
+
+	fbi = framebuffer_alloc(sizeof(struct mbxfb_info), &dev->dev);
+	if (fbi == NULL) {
+		dev_err(&dev->dev, "framebuffer_alloc failed\n");
+		return -ENOMEM;
+	}
+
+	mfbi = fbi->par;
+	fbi->pseudo_palette = mfbi->pseudo_palette;
+	pdata = dev->dev.platform_data;
+	if (pdata->probe)
+		mfbi->platform_probe = pdata->probe;
+	if (pdata->remove)
+		mfbi->platform_remove = pdata->remove;
+
+	mfbi->fb_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	mfbi->reg_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
+
+	if (!mfbi->fb_res || !mfbi->reg_res) {
+		dev_err(&dev->dev, "no resources found\n");
+		ret = -ENODEV;
+		goto err1;
+	}
+
+	mfbi->fb_req = request_mem_region(mfbi->fb_res->start,
+					  res_size(mfbi->fb_res), dev->name);
+	if (mfbi->fb_req == NULL) {
+		dev_err(&dev->dev, "failed to claim framebuffer memory\n");
+		ret = -EINVAL;
+		goto err1;
+	}
+	mfbi->fb_phys_addr = mfbi->fb_res->start;
+
+	mfbi->reg_req = request_mem_region(mfbi->reg_res->start,
+					   res_size(mfbi->reg_res), dev->name);
+	if (mfbi->reg_req == NULL) {
+		dev_err(&dev->dev, "failed to claim Marathon registers\n");
+		ret = -EINVAL;
+		goto err2;
+	}
+	mfbi->reg_phys_addr = mfbi->reg_res->start;
+
+	mfbi->reg_virt_addr = ioremap_nocache(mfbi->reg_phys_addr,
+					      res_size(mfbi->reg_req));
+	if (!mfbi->reg_virt_addr) {
+		dev_err(&dev->dev, "failed to ioremap Marathon registers\n");
+		ret = -EINVAL;
+		goto err3;
+	}
+	virt_base_2700 = (unsigned long)mfbi->reg_virt_addr;
+
+	mfbi->fb_virt_addr = ioremap_nocache(mfbi->fb_phys_addr,
+					     res_size(mfbi->fb_req));
+	if (!mfbi->reg_virt_addr) {
+		dev_err(&dev->dev, "failed to ioremap frame buffer\n");
+		ret = -EINVAL;
+		goto err4;
+	}
+
+	/* FIXME: get from platform */
+	fbi->screen_base = (char __iomem *)(mfbi->fb_virt_addr + 0x60000);
+	fbi->screen_size = 8 * 1024 * 1024;	/* 8 Megs */
+	fbi->fbops = &mbxfb_ops;
+
+	fbi->var = mbxfb_default;
+	fbi->fix = mbxfb_fix;
+	fbi->fix.smem_start = mfbi->fb_phys_addr + 0x60000;
+	fbi->fix.smem_len = 8 * 1024 * 1024;
+	fbi->fix.line_length = 640 * 2;
+
+	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
+	if (ret < 0) {
+		dev_err(&dev->dev, "fb_alloc_cmap failed\n");
+		ret = -EINVAL;
+		goto err5;
+	}
+
+	platform_set_drvdata(dev, fbi);
+
+	printk(KERN_INFO "fb%d: mbx frame buffer device\n", fbi->node);
+
+	if (mfbi->platform_probe)
+		mfbi->platform_probe(fbi);
+
+	enable_controller(fbi);
+
+	mbxfb_debugfs_init(fbi);
+
+	ret = register_framebuffer(fbi);
+	if (ret < 0) {
+		dev_err(&dev->dev, "register_framebuffer failed\n");
+		ret = -EINVAL;
+		goto err6;
+	}
+
+	return 0;
+
+err6:
+	fb_dealloc_cmap(&fbi->cmap);
+err5:
+	iounmap(mfbi->fb_virt_addr);
+err4:
+	iounmap(mfbi->reg_virt_addr);
+err3:
+	release_mem_region(mfbi->reg_res->start, res_size(mfbi->reg_res));
+err2:
+	release_mem_region(mfbi->fb_res->start, res_size(mfbi->fb_res));
+err1:
+	framebuffer_release(fbi);
+
+	return ret;
+}
+
+static int __devexit mbxfb_remove(struct platform_device *dev)
+{
+	struct fb_info *fbi = platform_get_drvdata(dev);
+
+	writel(SYSRST_RST, SYSRST);
+	udelay(1000);
+
+	mbxfb_debugfs_remove(fbi);
+
+	if (fbi) {
+		struct mbxfb_info *mfbi = fbi->par;
+
+		unregister_framebuffer(fbi);
+		if (mfbi) {
+			if (mfbi->platform_remove)
+				mfbi->platform_remove(fbi);
+
+			if (mfbi->fb_virt_addr)
+				iounmap(mfbi->fb_virt_addr);
+			if (mfbi->reg_virt_addr)
+				iounmap(mfbi->reg_virt_addr);
+			if (mfbi->reg_req)
+				release_mem_region(mfbi->reg_req->start,
+						   res_size(mfbi->reg_req));
+			if (mfbi->fb_req)
+				release_mem_region(mfbi->fb_req->start,
+						   res_size(mfbi->fb_req));
+		}
+		framebuffer_release(fbi);
+	}
+
+	return 0;
+}
+
+static struct platform_driver mbxfb_driver = {
+	.probe = mbxfb_probe,
+	.remove = mbxfb_remove,
+	.suspend = mbxfb_suspend,
+	.resume = mbxfb_resume,
+	.driver = {
+		.name = "mbx-fb",
+	},
+};
+
+int __devinit mbxfb_init(void)
+{
+	return platform_driver_register(&mbxfb_driver);
+}
+
+static void __devexit mbxfb_exit(void)
+{
+	platform_driver_unregister(&mbxfb_driver);
+}
+
+module_init(mbxfb_init);
+module_exit(mbxfb_exit);
+
+MODULE_DESCRIPTION("loadable framebuffer driver for Marathon device");
+MODULE_AUTHOR("Mike Rapoport, Compulab");
+MODULE_LICENSE("GPL");